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On 10 August 2012 19:20, hongbo.zhang hongbo.zhang@linaro.org wrote:

From: "hongbo.zhang" hongbo.zhang@linaro.com

A thermal driver may need to walk through the cooling devices binded to itself, which are listed in cooling_devices of thermal_zone_device, and this goal cannot be achieved without moving this structure declaration to the public header file.

Signed-off-by: hongbo.zhang hongbo.zhang@linaro.com

drivers/thermal/thermal_sys.c | 11 ----------- include/linux/thermal.h | 12 ++++++++++++ 2 files changed, 12 insertions(+), 11 deletions(-)

diff --git a/drivers/thermal/thermal_sys.c b/drivers/thermal/thermal_sys.c index 2ab31e4..0c5900f 100644 --- a/drivers/thermal/thermal_sys.c +++ b/drivers/thermal/thermal_sys.c @@ -41,17 +41,6 @@ MODULE_AUTHOR("Zhang Rui"); MODULE_DESCRIPTION("Generic thermal management sysfs support"); MODULE_LICENSE("GPL");

-struct thermal_cooling_device_instance {

•   int id;
  

•   char name[THERMAL_NAME_LENGTH];
  

•   struct thermal_zone_device *tz;
  

•   struct thermal_cooling_device *cdev;
  

•   int trip;
  

•   char attr_name[THERMAL_NAME_LENGTH];
  

•   struct device_attribute attr;
  

•   struct list_head node;
  

-};

static DEFINE_IDR(thermal_tz_idr); static DEFINE_IDR(thermal_cdev_idr); static DEFINE_MUTEX(thermal_idr_lock); diff --git a/include/linux/thermal.h b/include/linux/thermal.h index 4b94a61..3b05f37 100644 --- a/include/linux/thermal.h +++ b/include/linux/thermal.h @@ -119,6 +119,18 @@ struct thermal_zone_device { struct list_head node; struct delayed_work poll_queue; };

+struct thermal_cooling_device_instance {

•   int id;
  

•   char name[THERMAL_NAME_LENGTH];
  

•   struct thermal_zone_device *tz;
  

•   struct thermal_cooling_device *cdev;
  

•   int trip;
  

•   char attr_name[THERMAL_NAME_LENGTH];
  

•   struct device_attribute attr;
  

•   struct list_head node;
  

+};

/* Adding event notification support elements */ #define THERMAL_GENL_FAMILY_NAME "thermal_event"

#define THERMAL_GENL_VERSION 0x01

1.7.10

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On 10 August 2012 19:20, hongbo.zhang hongbo.zhang@linaro.org wrote:

From: "hongbo.zhang" hongbo.zhang@stericsson.com

This diver is based on the thermal management framework in thermal_sys.c. A thermal zone device is created with the trip points to which cooling devices can be binded, the current cooling device is cpufreq, e.g. CPU frequency is clipped down to cool the CPU, and other cooling devices can be added and binded to the trip points dynamically. The platform specific PRCMU interrupts are used to active thermal update when trip points are reached.

Signed-off-by: hongbo.zhang hongbo.zhang@linaro.com

arch/arm/boot/dts/db8500.dtsi | 11 + arch/arm/configs/u8500_defconfig | 4 + arch/arm/mach-ux500/board-mop500.c | 73 ++++ drivers/thermal/Kconfig | 20 + drivers/thermal/Makefile | 4 +- drivers/thermal/db8500_cpufreq_cooling.c | 175 +++++++++ drivers/thermal/db8500_thermal.c | 511 ++++++++++++++++++++++++++ include/linux/platform_data/db8500_thermal.h | 39 ++ 8 files changed, 836 insertions(+), 1 deletion(-) create mode 100644 drivers/thermal/db8500_cpufreq_cooling.c create mode 100644 drivers/thermal/db8500_thermal.c create mode 100644 include/linux/platform_data/db8500_thermal.h

diff --git a/arch/arm/boot/dts/db8500.dtsi b/arch/arm/boot/dts/db8500.dtsi index daedefe..a667399 100644 --- a/arch/arm/boot/dts/db8500.dtsi +++ b/arch/arm/boot/dts/db8500.dtsi @@ -174,6 +174,10 @@ compatible = "stericsson,nmk_pinctrl"; };

•           cpufreq-cooling {
  

•                    compatible = "stericsson,db8500-cpufreq-cooling";
  

•            };
  

•           usb@a03e0000 {
                    compatible = "stericsson,db8500-musb",
                            "mentor,musb";
  

@@ -203,6 +207,13 @@ reg = <0x80157450 0xC>; };

•                   thermal@801573c0 {
  

•                            compatible = "stericsson,db8500-thermal";
  

•                            reg = <0x801573c0 0x40>;
  

•                            interrupts = <21 0x4>, <22 0x4>;
  

•                            interrupt-names = "IRQ_HOTMON_LOW",
  

"IRQ_HOTMON_HIGH";

•                    };
  

•                   db8500-prcmu-regulators {
                            compatible =
  

"stericsson,db8500-prcmu-regulator";

diff --git a/arch/arm/configs/u8500_defconfig b/arch/arm/configs/u8500_defconfig index 036419f..15a455e 100644 --- a/arch/arm/configs/u8500_defconfig +++ b/arch/arm/configs/u8500_defconfig @@ -117,3 +117,7 @@ CONFIG_DEBUG_KERNEL=y CONFIG_DEBUG_INFO=y # CONFIG_FTRACE is not set CONFIG_DEBUG_USER=y +CONFIG_THERMAL=y +CONFIG_CPU_THERMAL=y +CONFIG_DB8500_THERMAL=y +CONFIG_DB8500_CPUFREQ_COOLING=y diff --git a/arch/arm/mach-ux500/board-mop500.c b/arch/arm/mach-ux500/board-mop500.c index 8674a89..5f59566 100644 --- a/arch/arm/mach-ux500/board-mop500.c +++ b/arch/arm/mach-ux500/board-mop500.c @@ -32,6 +32,8 @@ #include <linux/smsc911x.h> #include <linux/gpio_keys.h> #include <linux/delay.h> +#include <linux/platform_data/db8500_thermal.h>

#include <linux/of.h> #include <linux/of_platform.h> #include <linux/leds.h> @@ -212,6 +214,71 @@ static struct ab8500_platform_data ab8500_platdata = { };

/*

• • Thermal Sensor
• */

+static struct resource db8500_thsens_resources[] = {

•   {
  

•           .name = "IRQ_HOTMON_LOW",
  

•           .start  = IRQ_PRCMU_HOTMON_LOW,
  

•           .end    = IRQ_PRCMU_HOTMON_LOW,
  

•           .flags  = IORESOURCE_IRQ,
  

•   },
  

•   {
  

•           .name = "IRQ_HOTMON_HIGH",
  

•           .start  = IRQ_PRCMU_HOTMON_HIGH,
  

•           .end    = IRQ_PRCMU_HOTMON_HIGH,
  

•           .flags  = IORESOURCE_IRQ,
  

•   },
  

+};

+static struct db8500_trip_point db8500_trips_table[] = {

•   [0] = {
  

•           .temp = 70000,
  

•           .type = THERMAL_TRIP_ACTIVE,
  

•           .cooling_dev_name = {
  

•                   [0] = "thermal-cpufreq-0",
  

•           },
  

•   },
  

•   [1] = {
  

•           .temp = 75000,
  

•           .type = THERMAL_TRIP_ACTIVE,
  

•           .cooling_dev_name = {
  

•                   [0] = "thermal-cpufreq-1",
  

•           },
  

•   },
  

•   [2] = {
  

•           .temp = 80000,
  

•           .type = THERMAL_TRIP_ACTIVE,
  

•           .cooling_dev_name = {
  

•                   [0] = "thermal-cpufreq-2",
  

•           },
  

•   },
  

•   [3] = {
  

•           .temp = 85000,
  

•           .type = THERMAL_TRIP_CRITICAL,
  

•   },
  

+};

+static struct db8500_thsens_platform_data db8500_thsens_data = {

•   .trip_points    = db8500_trips_table,
  

•   .num_trips      = ARRAY_SIZE(db8500_trips_table),
  

+};

+static struct platform_device u8500_thsens_device = {

•   .name           = "db8500-thermal",
  

•   .resource       = db8500_thsens_resources,
  

•   .num_resources  = ARRAY_SIZE(db8500_thsens_resources),
  

•   .dev    = {
  

•           .platform_data  = &db8500_thsens_data,
  

•   },
  

+};

+static struct platform_device u8500_cpufreq_cooling_device = {

•   .name           = "db8500-cpufreq-cooling",
  

+};

+/*

• TPS61052

*/

@@ -586,6 +653,8 @@ static struct platform_device *snowball_platform_devs[] __initdata = { &snowball_led_dev, &snowball_key_dev, &snowball_sbnet_dev,

•   &u8500_thsens_device,
  

•   &u8500_cpufreq_cooling_device,
  

};

static void __init mop500_init_machine(void) @@ -757,6 +826,10 @@ struct of_dev_auxdata u8500_auxdata_lookup[] __initdata = { OF_DEV_AUXDATA("st,nomadik-i2c", 0x8012a000, "nmk-i2c.4", NULL), /* Requires device name bindings. */ OF_DEV_AUXDATA("stericsson,nmk_pinctrl", 0, "pinctrl-db8500", NULL),

•   OF_DEV_AUXDATA("stericsson,db8500-thermal", 0x801573c0,
  

•                   "db8500-thermal", &db8500_thsens_data),
  

•   OF_DEV_AUXDATA("stericsson,db8500-cpufreq-cooling", 0,
  

•                   "db8500-cpufreq-cooling", NULL),
    {},
  

};

diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig index ace6078..37bd484 100644 --- a/drivers/thermal/Kconfig +++ b/drivers/thermal/Kconfig @@ -30,6 +30,26 @@ config CPU_THERMAL and not the ACPI interface. If you want this support, you should say Y or M here.

+config DB8500_THERMAL

•   bool "db8500 thermal management"
  

•   depends on THERMAL
  

•   default y
  

•   help
  

•     Adds DB8500 thermal management implementation according to the
  

thermal

•     management framework. A thermal zone with several trip points
  

will be

•     created. Cooling devices can be binded to the trip points to
  

cool this

•     thermal zone if trip points reached.
  

+config DB8500_CPUFREQ_COOLING

•   tristate "db8500 cpufreq cooling"
  

•   depends on CPU_THERMAL
  

•   default y
  

•   help
  

•     Adds DB8500 cpufreq cooling devices, and these cooling devices
  

can be

•     binded to thermal zone trip points. When a trip point reached,
  

the

•     binded cpufreq cooling device turns active to set CPU frequency
  

low to

•     cool down the CPU.
  

config SPEAR_THERMAL bool "SPEAr thermal sensor driver" depends on THERMAL diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile index 30c456c..d146456 100644 --- a/drivers/thermal/Makefile +++ b/drivers/thermal/Makefile @@ -3,5 +3,7 @@ #

obj-$(CONFIG_THERMAL) += thermal_sys.o -obj-$(CONFIG_CPU_THERMAL) += cpu_cooling.o +obj-$(CONFIG_CPU_THERMAL) += cpu_cooling.o +obj-$(CONFIG_DB8500_THERMAL) += db8500_thermal.o +obj-$(CONFIG_DB8500_CPUFREQ_COOLING) +=db8500_cpufreq_cooling.o obj-$(CONFIG_SPEAR_THERMAL) += spear_thermal.o diff --git a/drivers/thermal/db8500_cpufreq_cooling.c b/drivers/thermal/db8500_cpufreq_cooling.c new file mode 100644 index 0000000..973d1ad --- /dev/null +++ b/drivers/thermal/db8500_cpufreq_cooling.c @@ -0,0 +1,175 @@ +/*

• • db8500_cpufreq_cooling.c - db8500 cpufreq works as cooling device.
• • Copyright (C) 2012 ST-Ericsson
• • Copyright (C) 2012 Linaro Ltd.
• • Author: Hongbo Zhang hognbo.zhang@stericsson.com
• • This program is free software; you can redistribute it and/or modify
• • it under the terms of the GNU General Public License as published by
• • the Free Software Foundation; either version 2 of the License, or
• • (at your option) any later version.
• • This program is distributed in the hope that it will be useful,
• • but WITHOUT ANY WARRANTY; without even the implied warranty of
• • MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
• • GNU General Public License for more details.
• */

+#include <linux/slab.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/cpufreq.h> +#include <linux/cpu_cooling.h> +#include <linux/err.h>

+static LIST_HEAD(db8500_cpufreq_cdev_list);

+struct db8500_cpufreq_cdev {

•   struct thermal_cooling_device *cdev;
  

•   struct list_head node;
  

+};

+/* Local function to create cpufreq clip table */ +static int cpufreq_table_create(struct platform_device *pdev,

•           struct freq_clip_table **freq_tab, int *num_freq)
  

+{

•   struct cpufreq_frequency_table *table;
  

•   struct freq_clip_table *clip;
  

•   unsigned int temp;
  

•   int i, j, count = 0;
  

•   table = cpufreq_frequency_get_table(0);
  

•   if (!table)
  

•           return -ENODATA;
  

•   /* Check number of frequencies */
  

•   for (i = 0; (table[i].frequency != CPUFREQ_TABLE_END); i++) {
  

•           if (table[i].frequency == CPUFREQ_ENTRY_INVALID)
  

•                   continue;
  

•           count++;
  

•   }
  

•   clip = devm_kzalloc(&pdev->dev,
  

•                   sizeof(struct freq_clip_table) * count,
  

GFP_KERNEL);

•   /* Save frequencies */
  

•   count = 0;
  

•   for (i = 0; (table[i].frequency != CPUFREQ_TABLE_END); i++) {
  

•           if (table[i].frequency == CPUFREQ_ENTRY_INVALID)
  

•                   continue;
  

•           clip[count].freq_clip_max = table[i].frequency;
  

•           count++;
  

•   }
  

•   /* Descending order frequencies */
  

•   for (i = 0; i <= count - 2; i++)
  

•           for (j = i + 1; j <= count - 1; j++)
  

•                   if (clip[i].freq_clip_max < clip[j].freq_clip_max)
  

{

•                           temp = clip[i].freq_clip_max;
  

•                           clip[i].freq_clip_max =
  

clip[j].freq_clip_max;

•                           clip[j].freq_clip_max = temp;
  

•                   }
  

•   for (i = 0; i < count; i++) {
  

•           clip[i].mask_val = cpu_present_mask;
  

•           pr_info("db8500_clip_tab.%d: %d\n", i,
  

clip[i].freq_clip_max);

•   }
  

•   *freq_tab = clip;
  

•   *num_freq = count;
  

•   return 0;
  

+}

+static int __devinit db8500_cpufreq_cooling_probe(struct platform_device *pdev) +{

•   struct freq_clip_table *freq_tab = NULL;
  

•   struct db8500_cpufreq_cdev *cooling_devs;
  

•   int i, ret, num_freq = 0;
  

•   if (cpufreq_table_create(pdev, &freq_tab, &num_freq))
  

•           return -ENODATA;
  

•   if (unlikely(!freq_tab || !num_freq))
  

•           return -ENODATA;
  

•   /* Create one cooling device for each clip frequency */
  

•   for (i = 0; i < num_freq; i++) {
  

•           cooling_devs = devm_kzalloc(&pdev->dev,
  

•                           sizeof(struct db8500_cpufreq_cdev),
  

GFP_KERNEL);

•           if (!cooling_devs) {
  

•                   ret = -ENOMEM;
  

•                   goto exit;
  

•           }
  

•           cooling_devs->cdev =
  

cpufreq_cooling_register(&freq_tab[i], 1);

•           if (IS_ERR(cooling_devs->cdev)) {
  

•                   pr_err("Failed to register cpufreq cooling
  

device\n");

•                   ret = PTR_ERR(cooling_devs->cdev);
  

•                   goto exit;
  

•           }
  

•           list_add_tail(&cooling_devs->node,
  

&db8500_cpufreq_cdev_list);

•           pr_info("Cooling device regestered: %s\n",
  

•                   cooling_devs->cdev->type);
  

•   }
  

•   return 0;
  

+exit:

•   list_for_each_entry(cooling_devs, &db8500_cpufreq_cdev_list, node)
  

•           cpufreq_cooling_unregister(cooling_devs->cdev);
  

•   return ret;
  

+}

+static int __devexit db8500_cpufreq_cooling_remove(struct platform_device *pdev) +{

•   struct db8500_cpufreq_cdev *cooling_devs;
  

•   list_for_each_entry(cooling_devs, &db8500_cpufreq_cdev_list, node)
  

•           cpufreq_cooling_unregister(cooling_devs->cdev);
  

•   return 0;
  

+}

+#ifdef CONFIG_OF +static const struct of_device_id db8500_cpufreq_cooling_match[] = {

•   { .compatible = "stericsson,db8500-cpufreq-cooling" },
  

•   {},
  

+}; +#else +#define db8500_cpufreq_cooling_match NULL +#endif

+static struct platform_driver db8500_cpufreq_cooling_driver = {

•   .driver = {
  

•           .owner = THIS_MODULE,
  

•           .name = "db8500-cpufreq-cooling",
  

•           .of_match_table = db8500_cpufreq_cooling_match,
  

•   },
  

•   .probe = db8500_cpufreq_cooling_probe,
  

•   .remove = __devexit_p(db8500_cpufreq_cooling_remove),
  

+};

+static int __init db8500_cpufreq_cooling_init(void) +{

•   return platform_driver_register(&db8500_cpufreq_cooling_driver);
  

+}

+static void __exit db8500_cpufreq_cooling_exit(void) +{

•   platform_driver_unregister(&db8500_cpufreq_cooling_driver);
  

+}

+/* Should be later than db8500_cpufreq_register */ +late_initcall(db8500_cpufreq_cooling_init); +module_exit(db8500_cpufreq_cooling_exit);

+MODULE_AUTHOR("Hongbo Zhang hongbo.zhang@stericsson.com"); +MODULE_DESCRIPTION("db8500 cpufreq cooling driver"); +MODULE_LICENSE("GPL"); diff --git a/drivers/thermal/db8500_thermal.c b/drivers/thermal/db8500_thermal.c new file mode 100644 index 0000000..920df6a --- /dev/null +++ b/drivers/thermal/db8500_thermal.c @@ -0,0 +1,511 @@ +/*

• • db8500_thermal.c - db8500 Thermal Management Implementation
• • Copyright (C) 2012 ST-Ericsson
• • Copyright (C) 2012 Linaro Ltd.
• • Author: Hongbo Zhang hognbo.zhang@stericsson.com
• • This program is free software; you can redistribute it and/or modify
• • it under the terms of the GNU General Public License as published by
• • the Free Software Foundation; either version 2 of the License, or
• • (at your option) any later version.
• • This program is distributed in the hope that it will be useful,
• • but WITHOUT ANY WARRANTY; without even the implied warranty of
• • MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
• • GNU General Public License for more details.
• */

+#include <linux/module.h> +#include <linux/slab.h> +#include <linux/interrupt.h> +#include <linux/platform_device.h> +#include <linux/thermal.h> +#include <linux/cpu_cooling.h> +#include <linux/mfd/dbx500-prcmu.h> +#include <linux/platform_data/db8500_thermal.h>

+#define PRCMU_DEFAULT_MEASURE_TIME 0xFFF +#define PRCMU_DEFAULT_LOW_TEMP 0

+struct db8500_thermal_zone {

•   struct thermal_zone_device *therm_dev;
  

•   struct mutex th_lock;
  

•   struct platform_device *thsens_pdev;
  

•   struct work_struct therm_work;
  

•   struct db8500_thsens_platform_data *trip_tab;
  

•   enum thermal_device_mode mode;
  

•   unsigned long cur_temp_pseudo;
  

•   unsigned int cur_index;
  

•   int low_irq;
  

•   int high_irq;
  

+};

+/* Bind callback functions for thermal zone */ +static int db8500_cdev_bind(struct thermal_zone_device *thermal,

•                   struct thermal_cooling_device *cdev)
  

+{

•   struct db8500_thermal_zone *pzone;
  

•   struct db8500_thsens_platform_data *ptrips;
  

•   char *cdev_name;
  

•   int i, j, ret;
  

•   pzone = (struct db8500_thermal_zone *)thermal->devdata;
  

•   ptrips = pzone->trip_tab;
  

•   if (!cdev->type)
  

•           return -EINVAL;
  

•   ret = -ENODEV;
  

•   for (i = 0; i < ptrips->num_trips; i++)
  

•           for (j = 0; j < COOLING_DEV_MAX; j++) {
  

•                   cdev_name =
  

ptrips->trip_points[i].cooling_dev_name[j];

•                   if (!cdev_name)
  

•                           continue;
  

•                   if (strcmp(cdev_name, cdev->type))
  

•                           continue;
  

•                   ret = thermal_zone_bind_cooling_device(
  

•                           thermal, i, cdev);
  

•                   if (ret)
  

•                           pr_err("Error binding cooling device.\n");
  

•                   else
  

•                           pr_info("Cdev %s binded.\n", cdev->type);
  

•           }
  

•   /* Force an update since polling mode is not used */
  

•   schedule_work(&pzone->therm_work);
  

•   return ret;
  

+}

+/* Unbind callback functions for thermal zone */ +static int db8500_cdev_unbind(struct thermal_zone_device *thermal,

•                     struct thermal_cooling_device *cdev)
  

+{

•   struct db8500_thermal_zone *pzone;
  

•   struct db8500_thsens_platform_data *ptrips;
  

•   char *cdev_name;
  

•   int i, j, ret;
  

•   pzone = (struct db8500_thermal_zone *)thermal->devdata;
  

•   ptrips = pzone->trip_tab;
  

•   if (!cdev->type)
  

•           return -EINVAL;
  

•   ret = -ENODEV;
  

•   for (i = 0; i < ptrips->num_trips; i++)
  

•           for (j = 0; j < COOLING_DEV_MAX; j++) {
  

•                   cdev_name =
  

ptrips->trip_points[i].cooling_dev_name[j];

•                   if (!cdev_name)
  

•                           continue;
  

•                   if (strcmp(cdev_name, cdev->type))
  

•                           continue;
  

•                   /* Invalidate the cooling device before unbinding
  

it */

•                   if (cdev->ops->set_cur_state)
  

•                           cdev->ops->set_cur_state(cdev, 0);
  

•                   ret = thermal_zone_unbind_cooling_device(
  

•                           thermal, i, cdev);
  

•                   if (ret)
  

•                           pr_err("Error unbinding cooling
  

device.\n");

•                   else
  

•                           pr_info("Cdev %s unbinded.\n", cdev->type);
  

•           }
  

•   return ret;
  

+}

+/* Get temperature callback functions for thermal zone */ +static int db8500_sys_get_temp(struct thermal_zone_device *thermal,

•                             unsigned long *temp)
  

+{

•   struct db8500_thermal_zone *pzone;
  

•   pzone = (struct db8500_thermal_zone *)thermal->devdata;
  

•   /* TODO: There is no PRCMU interface to get temperature data
  

currently,

•   so a pseudo temperature is returned , it works for the thermal
  

framework

•   and this will be fixed when the PRCMU interface is available */
  

•   *temp = pzone->cur_temp_pseudo;
  

•   return 0;
  

+}

+/* Get mode callback functions for thermal zone */ +static int db8500_sys_get_mode(struct thermal_zone_device *thermal,

•                       enum thermal_device_mode *mode)
  

+{

•   struct db8500_thermal_zone *pzone;
  

•   pzone = (struct db8500_thermal_zone *)thermal->devdata;
  

•   mutex_lock(&pzone->th_lock);
  

•   *mode = pzone->mode;
  

•   mutex_unlock(&pzone->th_lock);
  

•   return 0;
  

+}

+/* Set mode callback functions for thermal zone */ +static int db8500_sys_set_mode(struct thermal_zone_device *thermal,

•                   enum thermal_device_mode mode)
  

+{

•   struct db8500_thermal_zone *pzone;
  

•   struct thermal_zone_device      *pthdev;
  

•   struct thermal_cooling_device_instance *instance;
  

•   struct thermal_cooling_device *cdev;
  

•   pzone = (struct db8500_thermal_zone *)thermal->devdata;
  

•   pthdev = pzone->therm_dev;
  

•   if (!pthdev) {
  

•           pr_err("Thermal zone not registered.\n");
  

•           return 0;
  

•   }
  

•   mutex_lock(&pzone->th_lock);
  

•   if (mode == THERMAL_DEVICE_ENABLED && pzone->mode != mode) {
  

•           pzone->mode = mode;
  

•           schedule_work(&pzone->therm_work);
  

•   }
  

•   if (mode == THERMAL_DEVICE_DISABLED && pzone->mode != mode) {
  

•           pzone->mode = mode;
  

•           mutex_lock(&thermal->lock);
  

•           list_for_each_entry(instance,
  

•                   &thermal->cooling_devices, node) {
  

•                   cdev = instance->cdev;
  

•                   if (cdev->ops->set_cur_state)
  

•                           cdev->ops->set_cur_state(cdev, 0);
  

•           }
  

•           mutex_unlock(&thermal->lock);
  

•   }
  

•   mutex_unlock(&pzone->th_lock);
  

•   return 0;
  

+}

+/* Get trip type callback function for thermal zone */ +static int db8500_sys_get_trip_type(struct thermal_zone_device *thermal,

•                            int trip, enum thermal_trip_type *type)
  

+{

•   struct db8500_thermal_zone *pzone;
  

•   struct db8500_thsens_platform_data *ptrips;
  

•   pzone = (struct db8500_thermal_zone *)thermal->devdata;
  

•   ptrips = pzone->trip_tab;
  

•   if (trip >= ptrips->num_trips)
  

•           return -EINVAL;
  

•   *type = ptrips->trip_points[trip].type;
  

•   return 0;
  

+}

+/* Get trip temperature callback function for thermal zone */ +static int db8500_sys_get_trip_temp(struct thermal_zone_device *thermal,

•                            int trip, unsigned long *temp)
  

+{

•   struct db8500_thermal_zone *pzone;
  

•   struct db8500_thsens_platform_data *ptrips;
  

•   pzone = (struct db8500_thermal_zone *)thermal->devdata;
  

•   ptrips = pzone->trip_tab;
  

•   if (trip >= ptrips->num_trips)
  

•           return -EINVAL;
  

•   *temp = ptrips->trip_points[trip].temp;
  

•   return 0;
  

+}

+/* Get critical temperature callback function for thermal zone */ +static int db8500_sys_get_crit_temp(struct thermal_zone_device *thermal,

•                            unsigned long *temp)
  

+{

•   struct db8500_thermal_zone *pzone;
  

•   struct db8500_thsens_platform_data *ptrips;
  

•   int i;
  

•   pzone = (struct db8500_thermal_zone *)thermal->devdata;
  

•   ptrips = pzone->trip_tab;
  

•   for (i = (ptrips->num_trips - 1) ; i > 0 ; i--) {
  

•           if (ptrips->trip_points[i].type == THERMAL_TRIP_CRITICAL) {
  

•                   *temp = ptrips->trip_points[i].temp;
  

•                   return 0;
  

•           }
  

•   }
  

•   return -EINVAL;
  

+}

+static struct thermal_zone_device_ops thdev_ops = {

•   .bind = db8500_cdev_bind,
  

•   .unbind = db8500_cdev_unbind,
  

•   .get_temp = db8500_sys_get_temp,
  

•   .get_mode = db8500_sys_get_mode,
  

•   .set_mode = db8500_sys_set_mode,
  

•   .get_trip_type = db8500_sys_get_trip_type,
  

•   .get_trip_temp = db8500_sys_get_trip_temp,
  

•   .get_crit_temp = db8500_sys_get_crit_temp,
  

+};

+static irqreturn_t prcmu_low_irq_handler(int irq, void *irq_data) +{

•   struct db8500_thermal_zone *pzone = irq_data;
  

•   struct db8500_thsens_platform_data *ptrips;
  

•   unsigned long next_low, next_high;
  

•   unsigned int idx;
  

•   ptrips = pzone->trip_tab;
  

•   idx = pzone->cur_index;
  

•   if (unlikely(idx == 0))
  

•           /* Meaningless for thermal management, ignoring it */
  

•           return IRQ_HANDLED;
  

•   if (idx == 1) {
  

•           next_high = ptrips->trip_points[0].temp;
  

•           next_low = PRCMU_DEFAULT_LOW_TEMP;
  

•   } else {
  

•           next_high = ptrips->trip_points[idx-1].temp;
  

•           next_low = ptrips->trip_points[idx-2].temp;
  

•   }
  

•   pzone->cur_index -= 1;
  

•   pzone->cur_temp_pseudo = (next_high + next_low)/2;
  

•   prcmu_stop_temp_sense();
  

•   prcmu_config_hotmon((u8)(next_low/1000), (u8)(next_high/1000));
  

•   prcmu_start_temp_sense(PRCMU_DEFAULT_MEASURE_TIME);
  

•   pr_debug("PRCMU set max %ld, set min %ld\n", next_high, next_low);
  

•   schedule_work(&pzone->therm_work);
  

•   return IRQ_HANDLED;
  

+}

+static irqreturn_t prcmu_high_irq_handler(int irq, void *irq_data) +{

•   struct db8500_thermal_zone *pzone = irq_data;
  

•   struct db8500_thsens_platform_data *ptrips;
  

•   unsigned long next_low, next_high;
  

•   unsigned int idx;
  

•   ptrips = pzone->trip_tab;
  

•   idx = pzone->cur_index;
  

•   if (idx < ptrips->num_trips - 1) {
  

•           next_high = ptrips->trip_points[idx+1].temp;
  

•           next_low = ptrips->trip_points[idx].temp;
  

•           pzone->cur_index += 1;
  

•           pzone->cur_temp_pseudo = (next_high + next_low)/2;
  

•           prcmu_stop_temp_sense();
  

•           prcmu_config_hotmon((u8)(next_low/1000),
  

(u8)(next_high/1000));

•           prcmu_start_temp_sense(PRCMU_DEFAULT_MEASURE_TIME);
  

•           pr_debug("PRCMU set max %ld, min %ld\n", next_high,
  

next_low);

•   }
  

•   if (idx == ptrips->num_trips - 1)
  

•           pzone->cur_temp_pseudo = ptrips->trip_points[idx].temp + 1;
  

•   schedule_work(&pzone->therm_work);
  

•   return IRQ_HANDLED;
  

+}

+static void db8500_thermal_work(struct work_struct *work) +{

•   enum thermal_device_mode cur_mode;
  

•   struct db8500_thermal_zone *pzone;
  

•   pzone = container_of(work, struct db8500_thermal_zone, therm_work);
  

•   mutex_lock(&pzone->th_lock);
  

•   cur_mode = pzone->mode;
  

•   mutex_unlock(&pzone->th_lock);
  

•   if (cur_mode == THERMAL_DEVICE_DISABLED) {
  

•           pr_warn("Warning: thermal function disabled.\n");
  

•           return;
  

•   }
  

•   thermal_zone_device_update(pzone->therm_dev);
  

•   pr_debug("db8500_thermal_work finished.\n");
  

+}

+static int __devinit db8500_thermal_probe(struct platform_device *pdev) +{

•   struct db8500_thermal_zone *pzone = NULL;
  

•   struct db8500_thsens_platform_data *ptrips;
  

•   int low_irq, high_irq, ret = 0;
  

•   unsigned long dft_low, dft_high;
  

•   pr_info("Function db8500_thermal_probe.\n");
  

•   pzone = devm_kzalloc(&pdev->dev,
  

•                   sizeof(struct db8500_thermal_zone), GFP_KERNEL);
  

•   if (!pzone)
  

•           return -ENOMEM;
  

•   pzone->thsens_pdev = pdev;
  

•   low_irq = platform_get_irq_byname(pdev, "IRQ_HOTMON_LOW");
  

•   if (low_irq < 0) {
  

•           pr_err("Get IRQ_HOTMON_LOW failed.\n");
  

•           return low_irq;
  

•   }
  

•   ret = devm_request_threaded_irq(&pdev->dev, low_irq, NULL,
  

•           prcmu_low_irq_handler,
  

•           IRQF_NO_SUSPEND | IRQF_ONESHOT, "dbx500_temp_low", pzone);
  

•   if (ret < 0) {
  

•           pr_err("Failed to allocate temp low irq.\n");
  

•           return ret;
  

•   }
  

•   high_irq = platform_get_irq_byname(pdev, "IRQ_HOTMON_HIGH");
  

•   if (high_irq < 0) {
  

•           pr_err("Get IRQ_HOTMON_HIGH failed.\n");
  

•           return high_irq;
  

•   }
  

•   ret = devm_request_threaded_irq(&pdev->dev, high_irq, NULL,
  

•           prcmu_high_irq_handler,
  

•           IRQF_NO_SUSPEND | IRQF_ONESHOT, "dbx500_temp_high", pzone);
  

•   if (ret < 0) {
  

•           pr_err("Failed to allocate temp high irq.\n");
  

•           return ret;
  

•   }
  

•   pzone->low_irq = low_irq;
  

•   pzone->high_irq = high_irq;
  

•   pzone->mode = THERMAL_DEVICE_DISABLED;
  

•   mutex_init(&pzone->th_lock);
  

•   INIT_WORK(&pzone->therm_work, db8500_thermal_work);
  

•   ptrips = pdev->dev.platform_data;
  

•   pzone->trip_tab = ptrips;
  

•   pzone->therm_dev =
  

thermal_zone_device_register("db8500_thermal_zone",

•           ptrips->num_trips, 0, pzone, &thdev_ops, 0, 0, 0, 0);
  

•   if (IS_ERR(pzone->therm_dev)) {
  

•           pr_err("Failed to register thermal zone device\n");
  

•           return PTR_ERR(pzone->therm_dev);
  

•   }
  

•   dft_low = PRCMU_DEFAULT_LOW_TEMP;
  

•   dft_high = ptrips->trip_points[0].temp;
  

•   prcmu_stop_temp_sense();
  

•   prcmu_config_hotmon((u8)(dft_low/1000), (u8)(dft_high/1000));
  

•   prcmu_start_temp_sense(PRCMU_DEFAULT_MEASURE_TIME);
  

•   pzone->cur_index = 0;
  

•   pzone->cur_temp_pseudo = (dft_low + dft_high)/2;
  

•   pzone->mode = THERMAL_DEVICE_ENABLED;
  

•   platform_set_drvdata(pdev, pzone);
  

•   return 0;
  

+}

+static int __devexit db8500_thermal_remove(struct platform_device *pdev) +{

•   struct db8500_thermal_zone *pzone;
  

•   pzone = platform_get_drvdata(pdev);
  

•   cancel_work_sync(&pzone->therm_work);
  

•   if (pzone->therm_dev)
  

•           thermal_zone_device_unregister(pzone->therm_dev);
  

•   return 0;
  

+}

+static int db8500_thermal_suspend(struct platform_device *pdev,

•           pm_message_t state)
  

+{

•   struct db8500_thermal_zone *pzone;
  

•   pzone = platform_get_drvdata(pdev);
  

•   flush_work_sync(&pzone->therm_work);
  

•   prcmu_stop_temp_sense();
  

•   return 0;
  

+}

+static int db8500_thermal_resume(struct platform_device *pdev) +{

•   struct db8500_thermal_zone *pzone;
  

•   struct db8500_thsens_platform_data *ptrips;
  

•   unsigned long dft_low, dft_high;
  

•   pzone = platform_get_drvdata(pdev);
  

•   ptrips = pzone->trip_tab;
  

•   dft_low = PRCMU_DEFAULT_LOW_TEMP;
  

•   dft_high = ptrips->trip_points[0].temp;
  

•   prcmu_config_hotmon((u8)(dft_low/1000), (u8)(dft_high/1000));
  

•   prcmu_start_temp_sense(PRCMU_DEFAULT_MEASURE_TIME);
  

•   return 0;
  

+}

+#ifdef CONFIG_OF +static const struct of_device_id db8500_thermal_match[] = {

•   { .compatible = "stericsson,db8500-thermal" },
  

•   {},
  

+}; +#else +#define db8500_thermal_match NULL +#endif

+static struct platform_driver db8500_thermal_driver = {

•   .driver = {
  

•           .owner = THIS_MODULE,
  

•           .name = "db8500-thermal",
  

•           .of_match_table = db8500_thermal_match,
  

•   },
  

•   .probe = db8500_thermal_probe,
  

•   .suspend = db8500_thermal_suspend,
  

•   .resume = db8500_thermal_resume,
  

•   .remove = __devexit_p(db8500_thermal_remove),
  

+};

+static int __init db8500_thermal_init(void) +{

•   return platform_driver_register(&db8500_thermal_driver);
  

+}

+static void __exit db8500_thermal_exit(void) +{

•   platform_driver_unregister(&db8500_thermal_driver);
  

+}

+module_init(db8500_thermal_init); +module_exit(db8500_thermal_exit);

+MODULE_AUTHOR("Hongbo Zhang hongbo.zhang@stericsson.com"); +MODULE_DESCRIPTION("db8500 thermal driver"); +MODULE_LICENSE("GPL"); diff --git a/include/linux/platform_data/db8500_thermal.h b/include/linux/platform_data/db8500_thermal.h new file mode 100644 index 0000000..0b6d164 --- /dev/null +++ b/include/linux/platform_data/db8500_thermal.h @@ -0,0 +1,39 @@ +/*

• • db8500_thermal.h - db8500 Thermal Management Implementation
• • Copyright (C) 2012 ST-Ericsson
• • Copyright (C) 2012 Linaro Ltd.
• • Author: Hongbo Zhang hognbo.zhang@stericsson.com
• • This program is free software; you can redistribute it and/or modify
• • it under the terms of the GNU General Public License as published by
• • the Free Software Foundation; either version 2 of the License, or
• • (at your option) any later version.
• • This program is distributed in the hope that it will be useful,
• • but WITHOUT ANY WARRANTY; without even the implied warranty of
• • MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
• • GNU General Public License for more details.
• */

+#ifndef _DB8500_THERMAL_H_ +#define _DB8500_THERMAL_H_

+#include <linux/thermal.h>

+#define COOLING_DEV_MAX 8

+struct db8500_trip_point {

•   unsigned long temp;
  

•   enum thermal_trip_type type;
  

•   char *cooling_dev_name[COOLING_DEV_MAX];
  

+};

+struct db8500_thsens_platform_data {

•   struct db8500_trip_point *trip_points;
  

•   int num_trips;
  

+};

+#endif /* _DB8500_THERMAL_H_ */

1.7.10

On 16 August 2012 14:37, Zhang Rui rui.zhang@intel.com wrote:

On 四, 2012-08-16 at 14:23 +0800, Hongbo Zhang wrote:

...

Add more people into list.

On 10 August 2012 19:20, hongbo.zhang hongbo.zhang@linaro.org wrote: From: "hongbo.zhang" hongbo.zhang@stericsson.com

    This diver is based on the thermal management framework in
    thermal_sys.c.
    A thermal zone device is created with the trip points to which
    cooling
    devices can be binded, the current cooling device is cpufreq,
    e.g. CPU
    frequency is clipped down to cool the CPU, and other cooling
    devices can
    be added and binded to the trip points dynamically.
    The platform specific PRCMU interrupts are used to active
    thermal update
    when trip points are reached.

    Signed-off-by: hongbo.zhang <hongbo.zhang@linaro.com>
    ---
     arch/arm/boot/dts/db8500.dtsi                |   11 +
     arch/arm/configs/u8500_defconfig             |    4 +
     arch/arm/mach-ux500/board-mop500.c           |   73 ++++
     drivers/thermal/Kconfig                      |   20 +
     drivers/thermal/Makefile                     |    4 +-
     drivers/thermal/db8500_cpufreq_cooling.c     |  175 +++++++++
     drivers/thermal/db8500_thermal.c             |  511
    ++++++++++++++++++++++++++
     include/linux/platform_data/db8500_thermal.h |   39 ++
     8 files changed, 836 insertions(+), 1 deletion(-)
     create mode 100644 drivers/thermal/db8500_cpufreq_cooling.c
     create mode 100644 drivers/thermal/db8500_thermal.c
     create mode 100644
    include/linux/platform_data/db8500_thermal.h

    diff --git a/arch/arm/boot/dts/db8500.dtsi
    b/arch/arm/boot/dts/db8500.dtsi
    index daedefe..a667399 100644
    --- a/arch/arm/boot/dts/db8500.dtsi
    +++ b/arch/arm/boot/dts/db8500.dtsi
    @@ -174,6 +174,10 @@
                            compatible = "stericsson,nmk_pinctrl";
                    };

    +               cpufreq-cooling {
    +                        compatible =
    "stericsson,db8500-cpufreq-cooling";
    +                };
    +
                    usb@a03e0000 {
                            compatible = "stericsson,db8500-musb",
                                    "mentor,musb";
    @@ -203,6 +207,13 @@
                                    reg = <0x80157450 0xC>;
                            };

    +                       thermal@801573c0 {
    +                                compatible =
    "stericsson,db8500-thermal";
    +                                reg = <0x801573c0 0x40>;
    +                                interrupts = <21 0x4>, <22
    0x4>;
    +                                interrupt-names =
    "IRQ_HOTMON_LOW", "IRQ_HOTMON_HIGH";
    +                        };
    +
                            db8500-prcmu-regulators {
                                    compatible =
    "stericsson,db8500-prcmu-regulator";

    diff --git a/arch/arm/configs/u8500_defconfig
    b/arch/arm/configs/u8500_defconfig
    index 036419f..15a455e 100644
    --- a/arch/arm/configs/u8500_defconfig
    +++ b/arch/arm/configs/u8500_defconfig
    @@ -117,3 +117,7 @@ CONFIG_DEBUG_KERNEL=y
     CONFIG_DEBUG_INFO=y
     # CONFIG_FTRACE is not set
     CONFIG_DEBUG_USER=y
    +CONFIG_THERMAL=y
    +CONFIG_CPU_THERMAL=y
    +CONFIG_DB8500_THERMAL=y
    +CONFIG_DB8500_CPUFREQ_COOLING=y
    diff --git a/arch/arm/mach-ux500/board-mop500.c
    b/arch/arm/mach-ux500/board-mop500.c
    index 8674a89..5f59566 100644
    --- a/arch/arm/mach-ux500/board-mop500.c
    +++ b/arch/arm/mach-ux500/board-mop500.c
    @@ -32,6 +32,8 @@
     #include <linux/smsc911x.h>
     #include <linux/gpio_keys.h>
     #include <linux/delay.h>
    +#include <linux/platform_data/db8500_thermal.h>
    +
     #include <linux/of.h>
     #include <linux/of_platform.h>
     #include <linux/leds.h>
    @@ -212,6 +214,71 @@ static struct ab8500_platform_data
    ab8500_platdata = {
     };

     /*
    + * Thermal Sensor
    + */
    +
    +static struct resource db8500_thsens_resources[] = {
    +       {
    +               .name = "IRQ_HOTMON_LOW",
    +               .start  = IRQ_PRCMU_HOTMON_LOW,
    +               .end    = IRQ_PRCMU_HOTMON_LOW,
    +               .flags  = IORESOURCE_IRQ,
    +       },
    +       {
    +               .name = "IRQ_HOTMON_HIGH",
    +               .start  = IRQ_PRCMU_HOTMON_HIGH,
    +               .end    = IRQ_PRCMU_HOTMON_HIGH,
    +               .flags  = IORESOURCE_IRQ,
    +       },
    +};
    +
    +static struct db8500_trip_point db8500_trips_table[] = {
    +       [0] = {
    +               .temp = 70000,
    +               .type = THERMAL_TRIP_ACTIVE,
    +               .cooling_dev_name = {
    +                       [0] = "thermal-cpufreq-0",
    +               },
    +       },
    +       [1] = {
    +               .temp = 75000,
    +               .type = THERMAL_TRIP_ACTIVE,
    +               .cooling_dev_name = {
    +                       [0] = "thermal-cpufreq-1",
    +               },
    +       },
    +       [2] = {
    +               .temp = 80000,
    +               .type = THERMAL_TRIP_ACTIVE,
    +               .cooling_dev_name = {
    +                       [0] = "thermal-cpufreq-2",
    +               },
    +       },
    +       [3] = {
    +               .temp = 85000,
    +               .type = THERMAL_TRIP_CRITICAL,
    +       },
    +};
    +
    +static struct db8500_thsens_platform_data db8500_thsens_data
    = {
    +       .trip_points    = db8500_trips_table,
    +       .num_trips      = ARRAY_SIZE(db8500_trips_table),
    +};
    +
    +static struct platform_device u8500_thsens_device = {
    +       .name           = "db8500-thermal",
    +       .resource       = db8500_thsens_resources,
    +       .num_resources  = ARRAY_SIZE(db8500_thsens_resources),
    +       .dev    = {
    +               .platform_data  = &db8500_thsens_data,
    +       },
    +};
    +
    +static struct platform_device u8500_cpufreq_cooling_device =
    {
    +       .name           = "db8500-cpufreq-cooling",
    +};
    +
    +/*
      * TPS61052
      */

    @@ -586,6 +653,8 @@ static struct platform_device
    *snowball_platform_devs[] __initdata = {
            &snowball_led_dev,
            &snowball_key_dev,
            &snowball_sbnet_dev,
    +       &u8500_thsens_device,
    +       &u8500_cpufreq_cooling_device,
     };

     static void __init mop500_init_machine(void)
    @@ -757,6 +826,10 @@ struct of_dev_auxdata
    u8500_auxdata_lookup[] __initdata = {
            OF_DEV_AUXDATA("st,nomadik-i2c", 0x8012a000,
    "nmk-i2c.4", NULL),
            /* Requires device name bindings. */
            OF_DEV_AUXDATA("stericsson,nmk_pinctrl", 0,
    "pinctrl-db8500", NULL),
    +       OF_DEV_AUXDATA("stericsson,db8500-thermal",
    0x801573c0,
    +                       "db8500-thermal",
    &db8500_thsens_data),
    +       OF_DEV_AUXDATA("stericsson,db8500-cpufreq-cooling", 0,
    +                       "db8500-cpufreq-cooling", NULL),
            {},
     };

    diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig
    index ace6078..37bd484 100644
    --- a/drivers/thermal/Kconfig
    +++ b/drivers/thermal/Kconfig
    @@ -30,6 +30,26 @@ config CPU_THERMAL
              and not the ACPI interface.
              If you want this support, you should say Y or M
    here.

    +config DB8500_THERMAL
    +       bool "db8500 thermal management"
    +       depends on THERMAL
    +       default y
    +       help
    +         Adds DB8500 thermal management implementation
    according to the thermal
    +         management framework. A thermal zone with several
    trip points will be
    +         created. Cooling devices can be binded to the trip
    points to cool this
    +         thermal zone if trip points reached.
    +
    +config DB8500_CPUFREQ_COOLING
    +       tristate "db8500 cpufreq cooling"
    +       depends on CPU_THERMAL
    +       default y
    +       help
    +         Adds DB8500 cpufreq cooling devices, and these
    cooling devices can be
    +         binded to thermal zone trip points. When a trip
    point reached, the
    +         binded cpufreq cooling device turns active to set
    CPU frequency low to
    +         cool down the CPU.
    +
     config SPEAR_THERMAL
            bool "SPEAr thermal sensor driver"
            depends on THERMAL
    diff --git a/drivers/thermal/Makefile
    b/drivers/thermal/Makefile
    index 30c456c..d146456 100644
    --- a/drivers/thermal/Makefile
    +++ b/drivers/thermal/Makefile
    @@ -3,5 +3,7 @@
     #

     obj-$(CONFIG_THERMAL)          += thermal_sys.o
    -obj-$(CONFIG_CPU_THERMAL)       += cpu_cooling.o
    +obj-$(CONFIG_CPU_THERMAL)      += cpu_cooling.o
    +obj-$(CONFIG_DB8500_THERMAL)   += db8500_thermal.o
    +obj-$(CONFIG_DB8500_CPUFREQ_COOLING)
    +=db8500_cpufreq_cooling.o
     obj-$(CONFIG_SPEAR_THERMAL)            += spear_thermal.o
    diff --git a/drivers/thermal/db8500_cpufreq_cooling.c
    b/drivers/thermal/db8500_cpufreq_cooling.c
    new file mode 100644
    index 0000000..973d1ad
    --- /dev/null
    +++ b/drivers/thermal/db8500_cpufreq_cooling.c
    @@ -0,0 +1,175 @@
    +/*
    + * db8500_cpufreq_cooling.c - db8500 cpufreq works as cooling
    device.
    + *
    + * Copyright (C) 2012 ST-Ericsson
    + * Copyright (C) 2012 Linaro Ltd.
    + *
    + * Author: Hongbo Zhang <hognbo.zhang@stericsson.com>
    + *
    + * This program is free software; you can redistribute it
    and/or modify
    + * it under the terms of the GNU General Public License as
    published by
    + * the Free Software Foundation; either version 2 of the
    License, or
    + * (at your option) any later version.
    + *
    + * This program is distributed in the hope that it will be
    useful,
    + * but WITHOUT ANY WARRANTY; without even the implied
    warranty of
    + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
    the
    + * GNU General Public License for more details.
    + *
    + */
    +
    +#include <linux/slab.h>
    +#include <linux/module.h>
    +#include <linux/platform_device.h>
    +#include <linux/cpufreq.h>
    +#include <linux/cpu_cooling.h>
    +#include <linux/err.h>
    +
    +static LIST_HEAD(db8500_cpufreq_cdev_list);
    +
    +struct db8500_cpufreq_cdev {
    +       struct thermal_cooling_device *cdev;
    +       struct list_head node;
    +};
    +
    +/* Local function to create cpufreq clip table */
    +static int cpufreq_table_create(struct platform_device *pdev,
    +               struct freq_clip_table **freq_tab, int
    *num_freq)
    +{
    +       struct cpufreq_frequency_table *table;
    +       struct freq_clip_table *clip;
    +       unsigned int temp;
    +       int i, j, count = 0;
    +
    +       table = cpufreq_frequency_get_table(0);
    +       if (!table)
    +               return -ENODATA;
    +
    +       /* Check number of frequencies */
    +       for (i = 0; (table[i].frequency != CPUFREQ_TABLE_END);
    i++) {
    +               if (table[i].frequency ==
    CPUFREQ_ENTRY_INVALID)
    +                       continue;
    +               count++;
    +       }
    +
    +       clip = devm_kzalloc(&pdev->dev,
    +                       sizeof(struct freq_clip_table) *
    count, GFP_KERNEL);
    +
    +       /* Save frequencies */
    +       count = 0;
    +       for (i = 0; (table[i].frequency != CPUFREQ_TABLE_END);
    i++) {
    +               if (table[i].frequency ==
    CPUFREQ_ENTRY_INVALID)
    +                       continue;
    +               clip[count].freq_clip_max =
    table[i].frequency;
    +               count++;
    +       }
    +
    +       /* Descending order frequencies */
    +       for (i = 0; i <= count - 2; i++)
    +               for (j = i + 1; j <= count - 1; j++)
    +                       if (clip[i].freq_clip_max <
    clip[j].freq_clip_max) {
    +                               temp = clip[i].freq_clip_max;
    +                               clip[i].freq_clip_max =
    clip[j].freq_clip_max;
    +                               clip[j].freq_clip_max = temp;
    +                       }
    +
    +       for (i = 0; i < count; i++) {
    +               clip[i].mask_val = cpu_present_mask;
    +               pr_info("db8500_clip_tab.%d: %d\n", i,
    clip[i].freq_clip_max);
    +       }
    +
    +       *freq_tab = clip;
    +       *num_freq = count;
    +
    +       return 0;
    +}
    +
    +static int __devinit db8500_cpufreq_cooling_probe(struct
    platform_device *pdev)
    +{
    +       struct freq_clip_table *freq_tab = NULL;
    +       struct db8500_cpufreq_cdev *cooling_devs;
    +       int i, ret, num_freq = 0;
    +
    +       if (cpufreq_table_create(pdev, &freq_tab, &num_freq))
    +               return -ENODATA;
    +
    +       if (unlikely(!freq_tab || !num_freq))
    +               return -ENODATA;
    +
    +       /* Create one cooling device for each clip frequency
    */
    +       for (i = 0; i < num_freq; i++) {
    +               cooling_devs = devm_kzalloc(&pdev->dev,
    +                               sizeof(struct
    db8500_cpufreq_cdev), GFP_KERNEL);
    +               if (!cooling_devs) {
    +                       ret = -ENOMEM;
    +                       goto exit;
    +               }
    +
    +               cooling_devs->cdev =
    cpufreq_cooling_register(&freq_tab[i], 1);
    +
    +               if (IS_ERR(cooling_devs->cdev)) {
    +                       pr_err("Failed to register cpufreq
    cooling device\n");
    +                       ret = PTR_ERR(cooling_devs->cdev);
    +                       goto exit;
    +               }
    +
    +               list_add_tail(&cooling_devs->node,
    &db8500_cpufreq_cdev_list);
    +               pr_info("Cooling device regestered: %s\n",
    +                       cooling_devs->cdev->type);
    +       }
    +
    +       return 0;
    +
    +exit:
    +       list_for_each_entry(cooling_devs,
    &db8500_cpufreq_cdev_list, node)
    +
    cpufreq_cooling_unregister(cooling_devs->cdev);
    +
    +       return ret;
    +}
    +
    +static int __devexit db8500_cpufreq_cooling_remove(struct
    platform_device *pdev)
    +{
    +       struct db8500_cpufreq_cdev *cooling_devs;
    +
    +       list_for_each_entry(cooling_devs,
    &db8500_cpufreq_cdev_list, node)
    +
    cpufreq_cooling_unregister(cooling_devs->cdev);
    +
    +       return 0;
    +}
    +
    +#ifdef CONFIG_OF
    +static const struct of_device_id
    db8500_cpufreq_cooling_match[] = {
    +       { .compatible = "stericsson,db8500-cpufreq-cooling" },
    +       {},
    +};
    +#else
    +#define db8500_cpufreq_cooling_match NULL
    +#endif
    +
    +static struct platform_driver db8500_cpufreq_cooling_driver =
    {
    +       .driver = {
    +               .owner = THIS_MODULE,
    +               .name = "db8500-cpufreq-cooling",
    +               .of_match_table =
    db8500_cpufreq_cooling_match,
    +       },
    +       .probe = db8500_cpufreq_cooling_probe,
    +       .remove = __devexit_p(db8500_cpufreq_cooling_remove),
    +};
    +
    +static int __init db8500_cpufreq_cooling_init(void)
    +{
    +       return
    platform_driver_register(&db8500_cpufreq_cooling_driver);
    +}
    +
    +static void __exit db8500_cpufreq_cooling_exit(void)
    +{
    +
    platform_driver_unregister(&db8500_cpufreq_cooling_driver);
    +}
    +
    +/* Should be later than db8500_cpufreq_register */
    +late_initcall(db8500_cpufreq_cooling_init);
    +module_exit(db8500_cpufreq_cooling_exit);
    +
    +MODULE_AUTHOR("Hongbo Zhang <hongbo.zhang@stericsson.com>");
    +MODULE_DESCRIPTION("db8500 cpufreq cooling driver");
    +MODULE_LICENSE("GPL");
    diff --git a/drivers/thermal/db8500_thermal.c
    b/drivers/thermal/db8500_thermal.c
    new file mode 100644
    index 0000000..920df6a
    --- /dev/null
    +++ b/drivers/thermal/db8500_thermal.c
    @@ -0,0 +1,511 @@
    +/*
    + * db8500_thermal.c - db8500 Thermal Management
    Implementation
    + *
    + * Copyright (C) 2012 ST-Ericsson
    + * Copyright (C) 2012 Linaro Ltd.
    + *
    + * Author: Hongbo Zhang <hognbo.zhang@stericsson.com>
    + *
    + * This program is free software; you can redistribute it
    and/or modify
    + * it under the terms of the GNU General Public License as
    published by
    + * the Free Software Foundation; either version 2 of the
    License, or
    + * (at your option) any later version.
    + *
    + * This program is distributed in the hope that it will be
    useful,
    + * but WITHOUT ANY WARRANTY; without even the implied
    warranty of
    + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
    the
    + * GNU General Public License for more details.
    + *
    + */
    +
    +#include <linux/module.h>
    +#include <linux/slab.h>
    +#include <linux/interrupt.h>
    +#include <linux/platform_device.h>
    +#include <linux/thermal.h>
    +#include <linux/cpu_cooling.h>
    +#include <linux/mfd/dbx500-prcmu.h>
    +#include <linux/platform_data/db8500_thermal.h>
    +
    +#define PRCMU_DEFAULT_MEASURE_TIME 0xFFF
    +#define PRCMU_DEFAULT_LOW_TEMP 0
    +
    +struct db8500_thermal_zone {
    +       struct thermal_zone_device *therm_dev;
    +       struct mutex th_lock;
    +       struct platform_device *thsens_pdev;
    +       struct work_struct therm_work;
    +       struct db8500_thsens_platform_data *trip_tab;
    +       enum thermal_device_mode mode;
    +       unsigned long cur_temp_pseudo;
    +       unsigned int cur_index;
    +       int low_irq;
    +       int high_irq;
    +};
    +
    +/* Bind callback functions for thermal zone */
    +static int db8500_cdev_bind(struct thermal_zone_device
    *thermal,
    +                       struct thermal_cooling_device *cdev)
    +{
    +       struct db8500_thermal_zone *pzone;
    +       struct db8500_thsens_platform_data *ptrips;
    +       char *cdev_name;
    +       int i, j, ret;
    +
    +       pzone = (struct db8500_thermal_zone
    *)thermal->devdata;
    +       ptrips = pzone->trip_tab;
    +
    +       if (!cdev->type)
    +               return -EINVAL;
    +
    +       ret = -ENODEV;
    +       for (i = 0; i < ptrips->num_trips; i++)
    +               for (j = 0; j < COOLING_DEV_MAX; j++) {
    +                       cdev_name =
    ptrips->trip_points[i].cooling_dev_name[j];
    +                       if (!cdev_name)
    +                               continue;
    +
    +                       if (strcmp(cdev_name, cdev->type))
    +                               continue;
    +
    +                       ret =
    thermal_zone_bind_cooling_device(
    +                               thermal, i, cdev);
    +                       if (ret)
    +                               pr_err("Error binding cooling
    device.\n");
    +                       else
    +                               pr_info("Cdev %s binded.\n",
    cdev->type);
    +               }
    +
    +       /* Force an update since polling mode is not used */
    +       schedule_work(&pzone->therm_work);
    +
    +       return ret;
    +}
    +
    +/* Unbind callback functions for thermal zone */
    +static int db8500_cdev_unbind(struct thermal_zone_device
    *thermal,
    +                         struct thermal_cooling_device *cdev)
    +{
    +       struct db8500_thermal_zone *pzone;
    +       struct db8500_thsens_platform_data *ptrips;
    +       char *cdev_name;
    +       int i, j, ret;
    +
    +       pzone = (struct db8500_thermal_zone
    *)thermal->devdata;
    +       ptrips = pzone->trip_tab;
    +
    +       if (!cdev->type)
    +               return -EINVAL;
    +
    +       ret = -ENODEV;
    +       for (i = 0; i < ptrips->num_trips; i++)
    +               for (j = 0; j < COOLING_DEV_MAX; j++) {
    +                       cdev_name =
    ptrips->trip_points[i].cooling_dev_name[j];
    +                       if (!cdev_name)
    +                               continue;
    +
    +                       if (strcmp(cdev_name, cdev->type))
    +                               continue;
    +
    +                       /* Invalidate the cooling device
    before unbinding it */
    +                       if (cdev->ops->set_cur_state)
    +                               cdev->ops->set_cur_state(cdev,
    0);
    +
    +                       ret =
    thermal_zone_unbind_cooling_device(
    +                               thermal, i, cdev);
    +                       if (ret)
    +                               pr_err("Error unbinding
    cooling device.\n");
    +                       else
    +                               pr_info("Cdev %s unbinded.\n",
    cdev->type);
    +               }
    +
    +       return ret;
    +}
    +
    +/* Get temperature callback functions for thermal zone */
    +static int db8500_sys_get_temp(struct thermal_zone_device
    *thermal,
    +                                 unsigned long *temp)
    +{
    +       struct db8500_thermal_zone *pzone;
    +
    +       pzone = (struct db8500_thermal_zone
    *)thermal->devdata;
    +
    +       /* TODO: There is no PRCMU interface to get
    temperature data currently,
    +       so a pseudo temperature is returned , it works for the
    thermal framework
    +       and this will be fixed when the PRCMU interface is
    available */
    +       *temp = pzone->cur_temp_pseudo;
    +
    +       return 0;
    +}
    +
    +/* Get mode callback functions for thermal zone */
    +static int db8500_sys_get_mode(struct thermal_zone_device
    *thermal,
    +                           enum thermal_device_mode *mode)
    +{
    +       struct db8500_thermal_zone *pzone;
    +       pzone = (struct db8500_thermal_zone
    *)thermal->devdata;
    +
    +       mutex_lock(&pzone->th_lock);
    +       *mode = pzone->mode;
    +       mutex_unlock(&pzone->th_lock);
    +
    +       return 0;
    +}
    +
    +/* Set mode callback functions for thermal zone */
    +static int db8500_sys_set_mode(struct thermal_zone_device
    *thermal,
    +                       enum thermal_device_mode mode)
    +{
    +       struct db8500_thermal_zone *pzone;
    +       struct thermal_zone_device      *pthdev;
    +       struct thermal_cooling_device_instance *instance;
    +       struct thermal_cooling_device *cdev;
    +
    +       pzone = (struct db8500_thermal_zone
    *)thermal->devdata;
    +       pthdev = pzone->therm_dev;
    +
    +       if (!pthdev) {
    +               pr_err("Thermal zone not registered.\n");
    +               return 0;
    +       }
    +
    +       mutex_lock(&pzone->th_lock);
    +
    +       if (mode == THERMAL_DEVICE_ENABLED && pzone->mode !=
    mode) {
    +               pzone->mode = mode;
    +               schedule_work(&pzone->therm_work);
    +       }
    +
    +       if (mode == THERMAL_DEVICE_DISABLED && pzone->mode !=
    mode) {
    +               pzone->mode = mode;
    +
    +               mutex_lock(&thermal->lock);
    +               list_for_each_entry(instance,
    +                       &thermal->cooling_devices, node) {
    +                       cdev = instance->cdev;
    +                       if (cdev->ops->set_cur_state)
    +                               cdev->ops->set_cur_state(cdev,
    0);
    +               }

I guess this is the reason why you need patch 1/2, right?

If this is true, IMO, a proper way to do this is to introduce a new API in the generic thermal layer, say thermal_zone_deactive(), which will put all referenced cooling device to cooling state 0 instead. what do you think?

Hi Rui, Yes, this way also works, and I have also thought about this. Such a deactive function is needed in both set_mode and unbind functions.

thanks, rui

...

    +               mutex_unlock(&thermal->lock);
    +       }
    +
    +       mutex_unlock(&pzone->th_lock);
    +
    +       return 0;
    +}
    +
    +/* Get trip type callback function for thermal zone */
    +static int db8500_sys_get_trip_type(struct
    thermal_zone_device *thermal,
    +                                int trip, enum
    thermal_trip_type *type)
    +{
    +       struct db8500_thermal_zone *pzone;
    +       struct db8500_thsens_platform_data *ptrips;
    +
    +       pzone = (struct db8500_thermal_zone
    *)thermal->devdata;
    +       ptrips = pzone->trip_tab;
    +
    +       if (trip >= ptrips->num_trips)
    +               return -EINVAL;
    +
    +       *type = ptrips->trip_points[trip].type;
    +
    +       return 0;
    +}
    +
    +/* Get trip temperature callback function for thermal zone */
    +static int db8500_sys_get_trip_temp(struct
    thermal_zone_device *thermal,
    +                                int trip, unsigned long
    *temp)
    +{
    +       struct db8500_thermal_zone *pzone;
    +       struct db8500_thsens_platform_data *ptrips;
    +
    +       pzone = (struct db8500_thermal_zone
    *)thermal->devdata;
    +       ptrips = pzone->trip_tab;
    +
    +       if (trip >= ptrips->num_trips)
    +               return -EINVAL;
    +
    +       *temp = ptrips->trip_points[trip].temp;
    +
    +       return 0;
    +}
    +
    +/* Get critical temperature callback function for thermal
    zone */
    +static int db8500_sys_get_crit_temp(struct
    thermal_zone_device *thermal,
    +                                unsigned long *temp)
    +{
    +       struct db8500_thermal_zone *pzone;
    +       struct db8500_thsens_platform_data *ptrips;
    +       int i;
    +
    +       pzone = (struct db8500_thermal_zone
    *)thermal->devdata;
    +       ptrips = pzone->trip_tab;
    +
    +       for (i = (ptrips->num_trips - 1) ; i > 0 ; i--) {
    +               if (ptrips->trip_points[i].type ==
    THERMAL_TRIP_CRITICAL) {
    +                       *temp = ptrips->trip_points[i].temp;
    +                       return 0;
    +               }
    +       }
    +
    +       return -EINVAL;
    +}
    +
    +static struct thermal_zone_device_ops thdev_ops = {
    +       .bind = db8500_cdev_bind,
    +       .unbind = db8500_cdev_unbind,
    +       .get_temp = db8500_sys_get_temp,
    +       .get_mode = db8500_sys_get_mode,
    +       .set_mode = db8500_sys_set_mode,
    +       .get_trip_type = db8500_sys_get_trip_type,
    +       .get_trip_temp = db8500_sys_get_trip_temp,
    +       .get_crit_temp = db8500_sys_get_crit_temp,
    +};
    +
    +static irqreturn_t prcmu_low_irq_handler(int irq, void
    *irq_data)
    +{
    +       struct db8500_thermal_zone *pzone = irq_data;
    +       struct db8500_thsens_platform_data *ptrips;
    +       unsigned long next_low, next_high;
    +       unsigned int idx;
    +
    +       ptrips = pzone->trip_tab;
    +       idx = pzone->cur_index;
    +       if (unlikely(idx == 0))
    +               /* Meaningless for thermal management,
    ignoring it */
    +               return IRQ_HANDLED;
    +
    +       if (idx == 1) {
    +               next_high = ptrips->trip_points[0].temp;
    +               next_low = PRCMU_DEFAULT_LOW_TEMP;
    +       } else {
    +               next_high = ptrips->trip_points[idx-1].temp;
    +               next_low = ptrips->trip_points[idx-2].temp;
    +       }
    +
    +       pzone->cur_index -= 1;
    +       pzone->cur_temp_pseudo = (next_high + next_low)/2;
    +
    +       prcmu_stop_temp_sense();
    +       prcmu_config_hotmon((u8)(next_low/1000),
    (u8)(next_high/1000));
    +       prcmu_start_temp_sense(PRCMU_DEFAULT_MEASURE_TIME);
    +
    +       pr_debug("PRCMU set max %ld, set min %ld\n",
    next_high, next_low);
    +
    +       schedule_work(&pzone->therm_work);
    +
    +       return IRQ_HANDLED;
    +}
    +
    +static irqreturn_t prcmu_high_irq_handler(int irq, void
    *irq_data)
    +{
    +       struct db8500_thermal_zone *pzone = irq_data;
    +       struct db8500_thsens_platform_data *ptrips;
    +       unsigned long next_low, next_high;
    +       unsigned int idx;
    +
    +       ptrips = pzone->trip_tab;
    +       idx = pzone->cur_index;
    +
    +       if (idx < ptrips->num_trips - 1) {
    +               next_high = ptrips->trip_points[idx+1].temp;
    +               next_low = ptrips->trip_points[idx].temp;
    +
    +               pzone->cur_index += 1;
    +               pzone->cur_temp_pseudo = (next_high +
    next_low)/2;
    +
    +               prcmu_stop_temp_sense();
    +               prcmu_config_hotmon((u8)(next_low/1000),
    (u8)(next_high/1000));
    +
    prcmu_start_temp_sense(PRCMU_DEFAULT_MEASURE_TIME);
    +
    +               pr_debug("PRCMU set max %ld, min %ld\n",
    next_high, next_low);
    +       }
    +
    +       if (idx == ptrips->num_trips - 1)
    +               pzone->cur_temp_pseudo =
    ptrips->trip_points[idx].temp + 1;
    +
    +       schedule_work(&pzone->therm_work);
    +
    +       return IRQ_HANDLED;
    +}
    +
    +static void db8500_thermal_work(struct work_struct *work)
    +{
    +       enum thermal_device_mode cur_mode;
    +       struct db8500_thermal_zone *pzone;
    +
    +       pzone = container_of(work, struct db8500_thermal_zone,
    therm_work);
    +
    +       mutex_lock(&pzone->th_lock);
    +       cur_mode = pzone->mode;
    +       mutex_unlock(&pzone->th_lock);
    +
    +       if (cur_mode == THERMAL_DEVICE_DISABLED) {
    +               pr_warn("Warning: thermal function
    disabled.\n");
    +               return;
    +       }
    +
    +       thermal_zone_device_update(pzone->therm_dev);
    +       pr_debug("db8500_thermal_work finished.\n");
    +}
    +
    +static int __devinit db8500_thermal_probe(struct
    platform_device *pdev)
    +{
    +       struct db8500_thermal_zone *pzone = NULL;
    +       struct db8500_thsens_platform_data *ptrips;
    +       int low_irq, high_irq, ret = 0;
    +       unsigned long dft_low, dft_high;
    +
    +       pr_info("Function db8500_thermal_probe.\n");
    +
    +       pzone = devm_kzalloc(&pdev->dev,
    +                       sizeof(struct db8500_thermal_zone),
    GFP_KERNEL);
    +       if (!pzone)
    +               return -ENOMEM;
    +
    +       pzone->thsens_pdev = pdev;
    +
    +       low_irq = platform_get_irq_byname(pdev,
    "IRQ_HOTMON_LOW");
    +       if (low_irq < 0) {
    +               pr_err("Get IRQ_HOTMON_LOW failed.\n");
    +               return low_irq;
    +       }
    +
    +       ret = devm_request_threaded_irq(&pdev->dev, low_irq,
    NULL,
    +               prcmu_low_irq_handler,
    +               IRQF_NO_SUSPEND | IRQF_ONESHOT,
    "dbx500_temp_low", pzone);
    +       if (ret < 0) {
    +               pr_err("Failed to allocate temp low irq.\n");
    +               return ret;
    +       }
    +
    +       high_irq = platform_get_irq_byname(pdev,
    "IRQ_HOTMON_HIGH");
    +       if (high_irq < 0) {
    +               pr_err("Get IRQ_HOTMON_HIGH failed.\n");
    +               return high_irq;
    +       }
    +
    +       ret = devm_request_threaded_irq(&pdev->dev, high_irq,
    NULL,
    +               prcmu_high_irq_handler,
    +               IRQF_NO_SUSPEND | IRQF_ONESHOT,
    "dbx500_temp_high", pzone);
    +       if (ret < 0) {
    +               pr_err("Failed to allocate temp high irq.\n");
    +               return ret;
    +       }
    +
    +       pzone->low_irq = low_irq;
    +       pzone->high_irq = high_irq;
    +
    +       pzone->mode = THERMAL_DEVICE_DISABLED;
    +
    +       mutex_init(&pzone->th_lock);
    +
    +       INIT_WORK(&pzone->therm_work, db8500_thermal_work);
    +
    +       ptrips = pdev->dev.platform_data;
    +       pzone->trip_tab = ptrips;
    +
    +       pzone->therm_dev =
    thermal_zone_device_register("db8500_thermal_zone",
    +               ptrips->num_trips, 0, pzone, &thdev_ops, 0, 0,
    0, 0);
    +
    +       if (IS_ERR(pzone->therm_dev)) {
    +               pr_err("Failed to register thermal zone device
    \n");
    +               return PTR_ERR(pzone->therm_dev);
    +       }
    +
    +       dft_low = PRCMU_DEFAULT_LOW_TEMP;
    +       dft_high = ptrips->trip_points[0].temp;
    +
    +       prcmu_stop_temp_sense();
    +       prcmu_config_hotmon((u8)(dft_low/1000),
    (u8)(dft_high/1000));
    +       prcmu_start_temp_sense(PRCMU_DEFAULT_MEASURE_TIME);
    +
    +       pzone->cur_index = 0;
    +       pzone->cur_temp_pseudo = (dft_low + dft_high)/2;
    +
    +       pzone->mode = THERMAL_DEVICE_ENABLED;
    +
    +       platform_set_drvdata(pdev, pzone);
    +
    +       return 0;
    +}
    +
    +static int __devexit db8500_thermal_remove(struct
    platform_device *pdev)
    +{
    +       struct db8500_thermal_zone *pzone;
    +       pzone = platform_get_drvdata(pdev);
    +
    +       cancel_work_sync(&pzone->therm_work);
    +
    +       if (pzone->therm_dev)
    +
    thermal_zone_device_unregister(pzone->therm_dev);
    +
    +       return 0;
    +}
    +
    +static int db8500_thermal_suspend(struct platform_device
    *pdev,
    +               pm_message_t state)
    +{
    +       struct db8500_thermal_zone *pzone;
    +       pzone = platform_get_drvdata(pdev);
    +
    +       flush_work_sync(&pzone->therm_work);
    +       prcmu_stop_temp_sense();
    +
    +       return 0;
    +}
    +
    +static int db8500_thermal_resume(struct platform_device
    *pdev)
    +{
    +       struct db8500_thermal_zone *pzone;
    +       struct db8500_thsens_platform_data *ptrips;
    +       unsigned long dft_low, dft_high;
    +
    +       pzone = platform_get_drvdata(pdev);
    +       ptrips = pzone->trip_tab;
    +       dft_low = PRCMU_DEFAULT_LOW_TEMP;
    +       dft_high = ptrips->trip_points[0].temp;
    +
    +       prcmu_config_hotmon((u8)(dft_low/1000),
    (u8)(dft_high/1000));
    +       prcmu_start_temp_sense(PRCMU_DEFAULT_MEASURE_TIME);
    +
    +       return 0;
    +}
    +
    +#ifdef CONFIG_OF
    +static const struct of_device_id db8500_thermal_match[] = {
    +       { .compatible = "stericsson,db8500-thermal" },
    +       {},
    +};
    +#else
    +#define db8500_thermal_match NULL
    +#endif
    +
    +static struct platform_driver db8500_thermal_driver = {
    +       .driver = {
    +               .owner = THIS_MODULE,
    +               .name = "db8500-thermal",
    +               .of_match_table = db8500_thermal_match,
    +       },
    +       .probe = db8500_thermal_probe,
    +       .suspend = db8500_thermal_suspend,
    +       .resume = db8500_thermal_resume,
    +       .remove = __devexit_p(db8500_thermal_remove),
    +};
    +
    +static int __init db8500_thermal_init(void)
    +{
    +       return
    platform_driver_register(&db8500_thermal_driver);
    +}
    +
    +static void __exit db8500_thermal_exit(void)
    +{
    +       platform_driver_unregister(&db8500_thermal_driver);
    +}
    +
    +module_init(db8500_thermal_init);
    +module_exit(db8500_thermal_exit);
    +
    +MODULE_AUTHOR("Hongbo Zhang <hongbo.zhang@stericsson.com>");
    +MODULE_DESCRIPTION("db8500 thermal driver");
    +MODULE_LICENSE("GPL");
    diff --git a/include/linux/platform_data/db8500_thermal.h
    b/include/linux/platform_data/db8500_thermal.h
    new file mode 100644
    index 0000000..0b6d164
    --- /dev/null
    +++ b/include/linux/platform_data/db8500_thermal.h
    @@ -0,0 +1,39 @@
    +/*
    + * db8500_thermal.h - db8500 Thermal Management
    Implementation
    + *
    + * Copyright (C) 2012 ST-Ericsson
    + * Copyright (C) 2012 Linaro Ltd.
    + *
    + * Author: Hongbo Zhang <hognbo.zhang@stericsson.com>
    + *
    + * This program is free software; you can redistribute it
    and/or modify
    + * it under the terms of the GNU General Public License as
    published by
    + * the Free Software Foundation; either version 2 of the
    License, or
    + * (at your option) any later version.
    + *
    + * This program is distributed in the hope that it will be
    useful,
    + * but WITHOUT ANY WARRANTY; without even the implied
    warranty of
    + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
    the
    + * GNU General Public License for more details.
    + *
    + */
    +
    +#ifndef _DB8500_THERMAL_H_
    +#define _DB8500_THERMAL_H_
    +
    +#include <linux/thermal.h>
    +
    +#define COOLING_DEV_MAX 8
    +
    +struct db8500_trip_point {
    +       unsigned long temp;
    +       enum thermal_trip_type type;
    +       char *cooling_dev_name[COOLING_DEV_MAX];
    +};
    +
    +struct db8500_thsens_platform_data {
    +       struct db8500_trip_point *trip_points;
    +       int num_trips;
    +};
    +
    +#endif /* _DB8500_THERMAL_H_ */
    --
    1.7.10

On 31 August 2012 17:34, Francesco Lavra francescolavra.fl@gmail.comwrote:

Hi,

On Fri, Aug 10, 2012 at 1:20 PM, hongbo.zhang hongbo.zhang@linaro.org wrote:

...

From: "hongbo.zhang" hongbo.zhang@stericsson.com

This diver is based on the thermal management framework in thermal_sys.c. A thermal zone device is created with the trip points to which cooling devices can be binded, the current cooling device is cpufreq, e.g. CPU frequency is clipped down to cool the CPU, and other cooling devices can be added and binded to the trip points dynamically. The platform specific PRCMU interrupts are used to active thermal update when trip points are reached.

Signed-off-by: hongbo.zhang hongbo.zhang@linaro.com

arch/arm/boot/dts/db8500.dtsi | 11 + arch/arm/configs/u8500_defconfig | 4 + arch/arm/mach-ux500/board-mop500.c | 73 ++++ drivers/thermal/Kconfig | 20 + drivers/thermal/Makefile | 4 +- drivers/thermal/db8500_cpufreq_cooling.c | 175 +++++++++ drivers/thermal/db8500_thermal.c | 511

++++++++++++++++++++++++++

...

include/linux/platform_data/db8500_thermal.h | 39 ++ 8 files changed, 836 insertions(+), 1 deletion(-) create mode 100644 drivers/thermal/db8500_cpufreq_cooling.c create mode 100644 drivers/thermal/db8500_thermal.c create mode 100644 include/linux/platform_data/db8500_thermal.h

[snip]

...

diff --git a/drivers/thermal/Kconfig b/drivers/thermal/Kconfig index ace6078..37bd484 100644 --- a/drivers/thermal/Kconfig +++ b/drivers/thermal/Kconfig @@ -30,6 +30,26 @@ config CPU_THERMAL and not the ACPI interface. If you want this support, you should say Y or M here.

+config DB8500_THERMAL

•   bool "db8500 thermal management"
  

DB8500 should be uppercase

...

•   depends on THERMAL
  

•   default y
  

•   help
  

•     Adds DB8500 thermal management implementation according to the
  

thermal

...

•     management framework. A thermal zone with several trip points
  

will be

...

•     created. Cooling devices can be binded to the trip points to
  

cool this

s/binded/bound

...

•     thermal zone if trip points reached.
  

+config DB8500_CPUFREQ_COOLING

•   tristate "db8500 cpufreq cooling"
  

Uppercase

...

•   depends on CPU_THERMAL
  

•   default y
  

•   help
  

•     Adds DB8500 cpufreq cooling devices, and these cooling devices
  

can be

...

•     binded to thermal zone trip points. When a trip point reached,
  

the

...

•     binded cpufreq cooling device turns active to set CPU
  

frequency low to

s/binded/bound (twice)

...

•     cool down the CPU.
  

config SPEAR_THERMAL bool "SPEAr thermal sensor driver" depends on THERMAL diff --git a/drivers/thermal/Makefile b/drivers/thermal/Makefile index 30c456c..d146456 100644 --- a/drivers/thermal/Makefile +++ b/drivers/thermal/Makefile @@ -3,5 +3,7 @@ #

obj-$(CONFIG_THERMAL) += thermal_sys.o -obj-$(CONFIG_CPU_THERMAL) += cpu_cooling.o +obj-$(CONFIG_CPU_THERMAL) += cpu_cooling.o +obj-$(CONFIG_DB8500_THERMAL) += db8500_thermal.o +obj-$(CONFIG_DB8500_CPUFREQ_COOLING) +=db8500_cpufreq_cooling.o obj-$(CONFIG_SPEAR_THERMAL) += spear_thermal.o diff --git a/drivers/thermal/db8500_cpufreq_cooling.c

b/drivers/thermal/db8500_cpufreq_cooling.c

...

new file mode 100644 index 0000000..973d1ad --- /dev/null +++ b/drivers/thermal/db8500_cpufreq_cooling.c @@ -0,0 +1,175 @@ +/*

• • db8500_cpufreq_cooling.c - db8500 cpufreq works as cooling device.
• • Copyright (C) 2012 ST-Ericsson
• • Copyright (C) 2012 Linaro Ltd.
• • Author: Hongbo Zhang hognbo.zhang@stericsson.com
• • This program is free software; you can redistribute it and/or modify
• • it under the terms of the GNU General Public License as published by
• • the Free Software Foundation; either version 2 of the License, or
• • (at your option) any later version.
• • This program is distributed in the hope that it will be useful,
• • but WITHOUT ANY WARRANTY; without even the implied warranty of
• • MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
• • GNU General Public License for more details.
• */

+#include <linux/slab.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <linux/cpufreq.h> +#include <linux/cpu_cooling.h> +#include <linux/err.h>

+static LIST_HEAD(db8500_cpufreq_cdev_list);

+struct db8500_cpufreq_cdev {

•   struct thermal_cooling_device *cdev;
  

•   struct list_head node;
  

+};

+/* Local function to create cpufreq clip table */ +static int cpufreq_table_create(struct platform_device *pdev,

•           struct freq_clip_table **freq_tab, int *num_freq)
  

+{

•   struct cpufreq_frequency_table *table;
  

•   struct freq_clip_table *clip;
  

•   unsigned int temp;
  

•   int i, j, count = 0;
  

•   table = cpufreq_frequency_get_table(0);
  

•   if (!table)
  

•           return -ENODATA;
  

•   /* Check number of frequencies */
  

•   for (i = 0; (table[i].frequency != CPUFREQ_TABLE_END); i++) {
  

unneeded () in the for condition

...

•           if (table[i].frequency == CPUFREQ_ENTRY_INVALID)
  

•                   continue;
  

•           count++;
  

•   }
  

•   clip = devm_kzalloc(&pdev->dev,
  

•                   sizeof(struct freq_clip_table) * count,
  

GFP_KERNEL);

...

•   /* Save frequencies */
  

•   count = 0;
  

•   for (i = 0; (table[i].frequency != CPUFREQ_TABLE_END); i++) {
  

•           if (table[i].frequency == CPUFREQ_ENTRY_INVALID)
  

•                   continue;
  

•           clip[count].freq_clip_max = table[i].frequency;
  

•           count++;
  

•   }
  

You are counting the frequencies twice: there is no need to re-set count to 0 and re-increment it in the for loop.

Francesco, thank you for all of your comments very much. The second count is used as index of array clip[], it is not redundant. If don't re-set it to 0, count-- should be used, so we set the array clip[] from the end, it seems a bit strange.

Also the unneded parentheses in the for condition should be removed here as well.

...

•   /* Descending order frequencies */
  

•   for (i = 0; i <= count - 2; i++)
  

•           for (j = i + 1; j <= count - 1; j++)
  

•                   if (clip[i].freq_clip_max <
  

clip[j].freq_clip_max) {

...

•                           temp = clip[i].freq_clip_max;
  

•                           clip[i].freq_clip_max =
  

clip[j].freq_clip_max;

...

•                           clip[j].freq_clip_max = temp;
  

•                   }
  

•   for (i = 0; i < count; i++) {
  

•           clip[i].mask_val = cpu_present_mask;
  

•           pr_info("db8500_clip_tab.%d: %d\n", i,
  

clip[i].freq_clip_max);

...

•   }
  

•   *freq_tab = clip;
  

•   *num_freq = count;
  

•   return 0;
  

+}

+static int __devinit db8500_cpufreq_cooling_probe(struct

platform_device *pdev)

...

+{

•   struct freq_clip_table *freq_tab = NULL;
  

•   struct db8500_cpufreq_cdev *cooling_devs;
  

•   int i, ret, num_freq = 0;
  

•   if (cpufreq_table_create(pdev, &freq_tab, &num_freq))
  

•           return -ENODATA;
  

•   if (unlikely(!freq_tab || !num_freq))
  

•           return -ENODATA;
  

•   /* Create one cooling device for each clip frequency */
  

•   for (i = 0; i < num_freq; i++) {
  

•           cooling_devs = devm_kzalloc(&pdev->dev,
  

•                           sizeof(struct db8500_cpufreq_cdev),
  

GFP_KERNEL);

...

•           if (!cooling_devs) {
  

•                   ret = -ENOMEM;
  

•                   goto exit;
  

•           }
  

•           cooling_devs->cdev =
  

cpufreq_cooling_register(&freq_tab[i], 1);

...

•           if (IS_ERR(cooling_devs->cdev)) {
  

•                   pr_err("Failed to register cpufreq cooling
  

device\n");

...

•                   ret = PTR_ERR(cooling_devs->cdev);
  

•                   goto exit;
  

•           }
  

•           list_add_tail(&cooling_devs->node,
  

&db8500_cpufreq_cdev_list);

...

•           pr_info("Cooling device regestered: %s\n",
  

s/regestered/registered

...

•                   cooling_devs->cdev->type);
  

•   }
  

•   return 0;
  

+exit:

•   list_for_each_entry(cooling_devs, &db8500_cpufreq_cdev_list,
  

node)

...

•           cpufreq_cooling_unregister(cooling_devs->cdev);
  

•   return ret;
  

+}

+static int __devexit db8500_cpufreq_cooling_remove(struct

platform_device *pdev)

...

+{

•   struct db8500_cpufreq_cdev *cooling_devs;
  

•   list_for_each_entry(cooling_devs, &db8500_cpufreq_cdev_list,
  

node)

...

•           cpufreq_cooling_unregister(cooling_devs->cdev);
  

•   return 0;
  

+}

+#ifdef CONFIG_OF +static const struct of_device_id db8500_cpufreq_cooling_match[] = {

•   { .compatible = "stericsson,db8500-cpufreq-cooling" },
  

•   {},
  

+}; +#else +#define db8500_cpufreq_cooling_match NULL +#endif

+static struct platform_driver db8500_cpufreq_cooling_driver = {

•   .driver = {
  

•           .owner = THIS_MODULE,
  

•           .name = "db8500-cpufreq-cooling",
  

•           .of_match_table = db8500_cpufreq_cooling_match,
  

•   },
  

•   .probe = db8500_cpufreq_cooling_probe,
  

•   .remove = __devexit_p(db8500_cpufreq_cooling_remove),
  

+};

+static int __init db8500_cpufreq_cooling_init(void) +{

•   return platform_driver_register(&db8500_cpufreq_cooling_driver);
  

+}

+static void __exit db8500_cpufreq_cooling_exit(void) +{

•   platform_driver_unregister(&db8500_cpufreq_cooling_driver);
  

+}

+/* Should be later than db8500_cpufreq_register */ +late_initcall(db8500_cpufreq_cooling_init); +module_exit(db8500_cpufreq_cooling_exit);

+MODULE_AUTHOR("Hongbo Zhang hongbo.zhang@stericsson.com"); +MODULE_DESCRIPTION("db8500 cpufreq cooling driver");

DB8500 should be uppercase

...

+MODULE_LICENSE("GPL"); diff --git a/drivers/thermal/db8500_thermal.c

b/drivers/thermal/db8500_thermal.c

...

new file mode 100644 index 0000000..920df6a --- /dev/null +++ b/drivers/thermal/db8500_thermal.c @@ -0,0 +1,511 @@ +/*

• • db8500_thermal.c - db8500 Thermal Management Implementation
• • Copyright (C) 2012 ST-Ericsson
• • Copyright (C) 2012 Linaro Ltd.
• • Author: Hongbo Zhang hognbo.zhang@stericsson.com
• • This program is free software; you can redistribute it and/or modify
• • it under the terms of the GNU General Public License as published by
• • the Free Software Foundation; either version 2 of the License, or
• • (at your option) any later version.
• • This program is distributed in the hope that it will be useful,
• • but WITHOUT ANY WARRANTY; without even the implied warranty of
• • MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
• • GNU General Public License for more details.
• */

+#include <linux/module.h> +#include <linux/slab.h> +#include <linux/interrupt.h> +#include <linux/platform_device.h> +#include <linux/thermal.h> +#include <linux/cpu_cooling.h> +#include <linux/mfd/dbx500-prcmu.h> +#include <linux/platform_data/db8500_thermal.h>

+#define PRCMU_DEFAULT_MEASURE_TIME 0xFFF +#define PRCMU_DEFAULT_LOW_TEMP 0

+struct db8500_thermal_zone {

•   struct thermal_zone_device *therm_dev;
  

•   struct mutex th_lock;
  

•   struct platform_device *thsens_pdev;
  

•   struct work_struct therm_work;
  

•   struct db8500_thsens_platform_data *trip_tab;
  

•   enum thermal_device_mode mode;
  

•   unsigned long cur_temp_pseudo;
  

•   unsigned int cur_index;
  

•   int low_irq;
  

•   int high_irq;
  

+};

+/* Bind callback functions for thermal zone */ +static int db8500_cdev_bind(struct thermal_zone_device *thermal,

•                   struct thermal_cooling_device *cdev)
  

+{

•   struct db8500_thermal_zone *pzone;
  

•   struct db8500_thsens_platform_data *ptrips;
  

•   char *cdev_name;
  

•   int i, j, ret;
  

•   pzone = (struct db8500_thermal_zone *)thermal->devdata;
  

•   ptrips = pzone->trip_tab;
  

•   if (!cdev->type)
  

•           return -EINVAL;
  

•   ret = -ENODEV;
  

•   for (i = 0; i < ptrips->num_trips; i++)
  

•           for (j = 0; j < COOLING_DEV_MAX; j++) {
  

•                   cdev_name =
  

ptrips->trip_points[i].cooling_dev_name[j];

...

•                   if (!cdev_name)
  

•                           continue;
  

•                   if (strcmp(cdev_name, cdev->type))
  

•                           continue;
  

•                   ret = thermal_zone_bind_cooling_device(
  

•                           thermal, i, cdev);
  

•                   if (ret)
  

•                           pr_err("Error binding cooling
  

device.\n");

...

•                   else
  

•                           pr_info("Cdev %s binded.\n", cdev->type);
  

s/binded/bound

...

•           }
  

•   /* Force an update since polling mode is not used */
  

•   schedule_work(&pzone->therm_work);
  

•   return ret;
  

+}

+/* Unbind callback functions for thermal zone */ +static int db8500_cdev_unbind(struct thermal_zone_device *thermal,

•                     struct thermal_cooling_device *cdev)
  

+{

•   struct db8500_thermal_zone *pzone;
  

•   struct db8500_thsens_platform_data *ptrips;
  

•   char *cdev_name;
  

•   int i, j, ret;
  

•   pzone = (struct db8500_thermal_zone *)thermal->devdata;
  

•   ptrips = pzone->trip_tab;
  

•   if (!cdev->type)
  

•           return -EINVAL;
  

•   ret = -ENODEV;
  

•   for (i = 0; i < ptrips->num_trips; i++)
  

•           for (j = 0; j < COOLING_DEV_MAX; j++) {
  

•                   cdev_name =
  

ptrips->trip_points[i].cooling_dev_name[j];

...

•                   if (!cdev_name)
  

•                           continue;
  

•                   if (strcmp(cdev_name, cdev->type))
  

•                           continue;
  

•                   /* Invalidate the cooling device before
  

unbinding it */

...

•                   if (cdev->ops->set_cur_state)
  

•                           cdev->ops->set_cur_state(cdev, 0);
  

•                   ret = thermal_zone_unbind_cooling_device(
  

•                           thermal, i, cdev);
  

•                   if (ret)
  

•                           pr_err("Error unbinding cooling
  

device.\n");

...

•                   else
  

•                           pr_info("Cdev %s unbinded.\n",
  

cdev->type);

s/unbinded/unbound

...

•           }
  

•   return ret;
  

+}

+/* Get temperature callback functions for thermal zone */ +static int db8500_sys_get_temp(struct thermal_zone_device *thermal,

•                             unsigned long *temp)
  

+{

•   struct db8500_thermal_zone *pzone;
  

•   pzone = (struct db8500_thermal_zone *)thermal->devdata;
  

•   /* TODO: There is no PRCMU interface to get temperature data
  

currently,

...

•   so a pseudo temperature is returned , it works for the thermal
  

framework

...

•   and this will be fixed when the PRCMU interface is available */
  

•   *temp = pzone->cur_temp_pseudo;
  

•   return 0;
  

+}

+/* Get mode callback functions for thermal zone */ +static int db8500_sys_get_mode(struct thermal_zone_device *thermal,

•                       enum thermal_device_mode *mode)
  

+{

•   struct db8500_thermal_zone *pzone;
  

•   pzone = (struct db8500_thermal_zone *)thermal->devdata;
  

•   mutex_lock(&pzone->th_lock);
  

•   *mode = pzone->mode;
  

•   mutex_unlock(&pzone->th_lock);
  

•   return 0;
  

+}

+/* Set mode callback functions for thermal zone */ +static int db8500_sys_set_mode(struct thermal_zone_device *thermal,

•                   enum thermal_device_mode mode)
  

+{

•   struct db8500_thermal_zone *pzone;
  

•   struct thermal_zone_device      *pthdev;
  

•   struct thermal_cooling_device_instance *instance;
  

•   struct thermal_cooling_device *cdev;
  

•   pzone = (struct db8500_thermal_zone *)thermal->devdata;
  

•   pthdev = pzone->therm_dev;
  

•   if (!pthdev) {
  

•           pr_err("Thermal zone not registered.\n");
  

•           return 0;
  

•   }
  

•   mutex_lock(&pzone->th_lock);
  

•   if (mode == THERMAL_DEVICE_ENABLED && pzone->mode != mode) {
  

•           pzone->mode = mode;
  

•           schedule_work(&pzone->therm_work);
  

•   }
  

•   if (mode == THERMAL_DEVICE_DISABLED && pzone->mode != mode) {
  

•           pzone->mode = mode;
  

•           mutex_lock(&thermal->lock);
  

•           list_for_each_entry(instance,
  

•                   &thermal->cooling_devices, node) {
  

•                   cdev = instance->cdev;
  

•                   if (cdev->ops->set_cur_state)
  

•                           cdev->ops->set_cur_state(cdev, 0);
  

•           }
  

•           mutex_unlock(&thermal->lock);
  

•   }
  

•   mutex_unlock(&pzone->th_lock);
  

•   return 0;
  

+}

+/* Get trip type callback function for thermal zone */ +static int db8500_sys_get_trip_type(struct thermal_zone_device *thermal,

•                            int trip, enum thermal_trip_type *type)
  

+{

•   struct db8500_thermal_zone *pzone;
  

•   struct db8500_thsens_platform_data *ptrips;
  

•   pzone = (struct db8500_thermal_zone *)thermal->devdata;
  

•   ptrips = pzone->trip_tab;
  

•   if (trip >= ptrips->num_trips)
  

•           return -EINVAL;
  

•   *type = ptrips->trip_points[trip].type;
  

•   return 0;
  

+}

+/* Get trip temperature callback function for thermal zone */ +static int db8500_sys_get_trip_temp(struct thermal_zone_device *thermal,

•                            int trip, unsigned long *temp)
  

+{

•   struct db8500_thermal_zone *pzone;
  

•   struct db8500_thsens_platform_data *ptrips;
  

•   pzone = (struct db8500_thermal_zone *)thermal->devdata;
  

•   ptrips = pzone->trip_tab;
  

•   if (trip >= ptrips->num_trips)
  

•           return -EINVAL;
  

•   *temp = ptrips->trip_points[trip].temp;
  

•   return 0;
  

+}

+/* Get critical temperature callback function for thermal zone */ +static int db8500_sys_get_crit_temp(struct thermal_zone_device *thermal,

•                            unsigned long *temp)
  

+{

•   struct db8500_thermal_zone *pzone;
  

•   struct db8500_thsens_platform_data *ptrips;
  

•   int i;
  

•   pzone = (struct db8500_thermal_zone *)thermal->devdata;
  

•   ptrips = pzone->trip_tab;
  

•   for (i = (ptrips->num_trips - 1) ; i > 0 ; i--) {
  

There shouldn't be leading spaces before ;

...

•           if (ptrips->trip_points[i].type ==
  

THERMAL_TRIP_CRITICAL) {

...

•                   *temp = ptrips->trip_points[i].temp;
  

•                   return 0;
  

•           }
  

•   }
  

•   return -EINVAL;
  

+}

+static struct thermal_zone_device_ops thdev_ops = {

•   .bind = db8500_cdev_bind,
  

•   .unbind = db8500_cdev_unbind,
  

•   .get_temp = db8500_sys_get_temp,
  

•   .get_mode = db8500_sys_get_mode,
  

•   .set_mode = db8500_sys_set_mode,
  

•   .get_trip_type = db8500_sys_get_trip_type,
  

•   .get_trip_temp = db8500_sys_get_trip_temp,
  

•   .get_crit_temp = db8500_sys_get_crit_temp,
  

+};

+static irqreturn_t prcmu_low_irq_handler(int irq, void *irq_data) +{

•   struct db8500_thermal_zone *pzone = irq_data;
  

•   struct db8500_thsens_platform_data *ptrips;
  

•   unsigned long next_low, next_high;
  

•   unsigned int idx;
  

•   ptrips = pzone->trip_tab;
  

•   idx = pzone->cur_index;
  

•   if (unlikely(idx == 0))
  

•           /* Meaningless for thermal management, ignoring it */
  

•           return IRQ_HANDLED;
  

•   if (idx == 1) {
  

•           next_high = ptrips->trip_points[0].temp;
  

•           next_low = PRCMU_DEFAULT_LOW_TEMP;
  

•   } else {
  

•           next_high = ptrips->trip_points[idx-1].temp;
  

•           next_low = ptrips->trip_points[idx-2].temp;
  

•   }
  

•   pzone->cur_index -= 1;
  

•   pzone->cur_temp_pseudo = (next_high + next_low)/2;
  

•   prcmu_stop_temp_sense();
  

•   prcmu_config_hotmon((u8)(next_low/1000), (u8)(next_high/1000));
  

•   prcmu_start_temp_sense(PRCMU_DEFAULT_MEASURE_TIME);
  

•   pr_debug("PRCMU set max %ld, set min %ld\n", next_high,
  

next_low);

...

•   schedule_work(&pzone->therm_work);
  

•   return IRQ_HANDLED;
  

+}

+static irqreturn_t prcmu_high_irq_handler(int irq, void *irq_data) +{

•   struct db8500_thermal_zone *pzone = irq_data;
  

•   struct db8500_thsens_platform_data *ptrips;
  

•   unsigned long next_low, next_high;
  

•   unsigned int idx;
  

•   ptrips = pzone->trip_tab;
  

•   idx = pzone->cur_index;
  

•   if (idx < ptrips->num_trips - 1) {
  

•           next_high = ptrips->trip_points[idx+1].temp;
  

•           next_low = ptrips->trip_points[idx].temp;
  

•           pzone->cur_index += 1;
  

•           pzone->cur_temp_pseudo = (next_high + next_low)/2;
  

•           prcmu_stop_temp_sense();
  

•           prcmu_config_hotmon((u8)(next_low/1000),
  

(u8)(next_high/1000));

...

•           prcmu_start_temp_sense(PRCMU_DEFAULT_MEASURE_TIME);
  

•           pr_debug("PRCMU set max %ld, min %ld\n", next_high,
  

next_low);

...

•   }
  

•   if (idx == ptrips->num_trips - 1)
  

•           pzone->cur_temp_pseudo = ptrips->trip_points[idx].temp +
  

1;

...

•   schedule_work(&pzone->therm_work);
  

•   return IRQ_HANDLED;
  

+}

+static void db8500_thermal_work(struct work_struct *work) +{

•   enum thermal_device_mode cur_mode;
  

•   struct db8500_thermal_zone *pzone;
  

•   pzone = container_of(work, struct db8500_thermal_zone,
  

therm_work);

...

•   mutex_lock(&pzone->th_lock);
  

•   cur_mode = pzone->mode;
  

•   mutex_unlock(&pzone->th_lock);
  

•   if (cur_mode == THERMAL_DEVICE_DISABLED) {
  

•           pr_warn("Warning: thermal function disabled.\n");
  

•           return;
  

•   }
  

•   thermal_zone_device_update(pzone->therm_dev);
  

•   pr_debug("db8500_thermal_work finished.\n");
  

+}

+static int __devinit db8500_thermal_probe(struct platform_device *pdev) +{

•   struct db8500_thermal_zone *pzone = NULL;
  

•   struct db8500_thsens_platform_data *ptrips;
  

•   int low_irq, high_irq, ret = 0;
  

•   unsigned long dft_low, dft_high;
  

•   pr_info("Function db8500_thermal_probe.\n");
  

This seems to me a little bit too verbose...

...

•   pzone = devm_kzalloc(&pdev->dev,
  

•                   sizeof(struct db8500_thermal_zone), GFP_KERNEL);
  

•   if (!pzone)
  

•           return -ENOMEM;
  

•   pzone->thsens_pdev = pdev;
  

•   low_irq = platform_get_irq_byname(pdev, "IRQ_HOTMON_LOW");
  

•   if (low_irq < 0) {
  

•           pr_err("Get IRQ_HOTMON_LOW failed.\n");
  

•           return low_irq;
  

•   }
  

•   ret = devm_request_threaded_irq(&pdev->dev, low_irq, NULL,
  

•           prcmu_low_irq_handler,
  

•           IRQF_NO_SUSPEND | IRQF_ONESHOT, "dbx500_temp_low",
  

pzone);

...

•   if (ret < 0) {
  

•           pr_err("Failed to allocate temp low irq.\n");
  

•           return ret;
  

•   }
  

•   high_irq = platform_get_irq_byname(pdev, "IRQ_HOTMON_HIGH");
  

•   if (high_irq < 0) {
  

•           pr_err("Get IRQ_HOTMON_HIGH failed.\n");
  

•           return high_irq;
  

•   }
  

•   ret = devm_request_threaded_irq(&pdev->dev, high_irq, NULL,
  

•           prcmu_high_irq_handler,
  

•           IRQF_NO_SUSPEND | IRQF_ONESHOT, "dbx500_temp_high",
  

pzone);

...

•   if (ret < 0) {
  

•           pr_err("Failed to allocate temp high irq.\n");
  

•           return ret;
  

•   }
  

•   pzone->low_irq = low_irq;
  

•   pzone->high_irq = high_irq;
  

•   pzone->mode = THERMAL_DEVICE_DISABLED;
  

•   mutex_init(&pzone->th_lock);
  

•   INIT_WORK(&pzone->therm_work, db8500_thermal_work);
  

•   ptrips = pdev->dev.platform_data;
  

•   pzone->trip_tab = ptrips;
  

•   pzone->therm_dev =
  

thermal_zone_device_register("db8500_thermal_zone",

...

•           ptrips->num_trips, 0, pzone, &thdev_ops, 0, 0, 0, 0);
  

•   if (IS_ERR(pzone->therm_dev)) {
  

•           pr_err("Failed to register thermal zone device\n");
  

•           return PTR_ERR(pzone->therm_dev);
  

•   }
  

•   dft_low = PRCMU_DEFAULT_LOW_TEMP;
  

•   dft_high = ptrips->trip_points[0].temp;
  

•   prcmu_stop_temp_sense();
  

•   prcmu_config_hotmon((u8)(dft_low/1000), (u8)(dft_high/1000));
  

•   prcmu_start_temp_sense(PRCMU_DEFAULT_MEASURE_TIME);
  

•   pzone->cur_index = 0;
  

•   pzone->cur_temp_pseudo = (dft_low + dft_high)/2;
  

•   pzone->mode = THERMAL_DEVICE_ENABLED;
  

•   platform_set_drvdata(pdev, pzone);
  

•   return 0;
  

+}

+static int __devexit db8500_thermal_remove(struct platform_device *pdev) +{

•   struct db8500_thermal_zone *pzone;
  

•   pzone = platform_get_drvdata(pdev);
  

•   cancel_work_sync(&pzone->therm_work);
  

•   if (pzone->therm_dev)
  

•           thermal_zone_device_unregister(pzone->therm_dev);
  

•   return 0;
  

+}

+static int db8500_thermal_suspend(struct platform_device *pdev,

•           pm_message_t state)
  

+{

•   struct db8500_thermal_zone *pzone;
  

•   pzone = platform_get_drvdata(pdev);
  

•   flush_work_sync(&pzone->therm_work);
  

•   prcmu_stop_temp_sense();
  

•   return 0;
  

+}

+static int db8500_thermal_resume(struct platform_device *pdev) +{

•   struct db8500_thermal_zone *pzone;
  

•   struct db8500_thsens_platform_data *ptrips;
  

•   unsigned long dft_low, dft_high;
  

•   pzone = platform_get_drvdata(pdev);
  

•   ptrips = pzone->trip_tab;
  

•   dft_low = PRCMU_DEFAULT_LOW_TEMP;
  

•   dft_high = ptrips->trip_points[0].temp;
  

•   prcmu_config_hotmon((u8)(dft_low/1000), (u8)(dft_high/1000));
  

•   prcmu_start_temp_sense(PRCMU_DEFAULT_MEASURE_TIME);
  

•   return 0;
  

+}

+#ifdef CONFIG_OF +static const struct of_device_id db8500_thermal_match[] = {

•   { .compatible = "stericsson,db8500-thermal" },
  

•   {},
  

+}; +#else +#define db8500_thermal_match NULL +#endif

+static struct platform_driver db8500_thermal_driver = {

•   .driver = {
  

•           .owner = THIS_MODULE,
  

•           .name = "db8500-thermal",
  

•           .of_match_table = db8500_thermal_match,
  

•   },
  

•   .probe = db8500_thermal_probe,
  

•   .suspend = db8500_thermal_suspend,
  

•   .resume = db8500_thermal_resume,
  

•   .remove = __devexit_p(db8500_thermal_remove),
  

+};

+static int __init db8500_thermal_init(void) +{

•   return platform_driver_register(&db8500_thermal_driver);
  

+}

+static void __exit db8500_thermal_exit(void) +{

•   platform_driver_unregister(&db8500_thermal_driver);
  

+}

+module_init(db8500_thermal_init); +module_exit(db8500_thermal_exit);

+MODULE_AUTHOR("Hongbo Zhang hongbo.zhang@stericsson.com"); +MODULE_DESCRIPTION("db8500 thermal driver");

DB8500 uppercase

Regards, Francesco