greybus-dev October 2018

greybus-dev@lists.linaro.org

3 participants
3 discussions

[PATCH] greybus: gpio: switch GPIO portions to use GPIOLIB_IRQCHIP

by Nishad Kamdar

Convert the GPIO driver to use the GPIO irqchip library GPIOLIB_IRQCHIP instead of reimplementing the same. Signed-off-by: Nishad Kamdar <nishadkamdar(a)gmail.com> --- drivers/staging/greybus/Kconfig | 1 + drivers/staging/greybus/gpio.c | 123 ++++++-------------------------- 2 files changed, 21 insertions(+), 103 deletions(-) diff --git a/drivers/staging/greybus/Kconfig b/drivers/staging/greybus/Kconfig index ab096bcef98c..b571e4e8060b 100644 --- a/drivers/staging/greybus/Kconfig +++ b/drivers/staging/greybus/Kconfig @@ -148,6 +148,7 @@ if GREYBUS_BRIDGED_PHY config GREYBUS_GPIO tristate "Greybus GPIO Bridged PHY driver" depends on GPIOLIB + select GPIOLIB_IRQCHIP ---help--- Select this option if you have a device that follows the Greybus GPIO Bridged PHY Class specification. diff --git a/drivers/staging/greybus/gpio.c b/drivers/staging/greybus/gpio.c index b1d4698019a1..32c228bad33a 100644 --- a/drivers/staging/greybus/gpio.c +++ b/drivers/staging/greybus/gpio.c @@ -9,9 +9,7 @@ #include <linux/kernel.h> #include <linux/module.h> #include <linux/slab.h> -#include <linux/gpio.h> -#include <linux/irq.h> -#include <linux/irqdomain.h> +#include <linux/gpio/driver.h> #include <linux/mutex.h> #include "greybus.h" @@ -40,8 +38,6 @@ struct gb_gpio_controller { struct gpio_chip chip; struct irq_chip irqc; struct irq_chip *irqchip; - struct irq_domain *irqdomain; - unsigned int irq_base; irq_flow_handler_t irq_handler; unsigned int irq_default_type; struct mutex irq_lock; @@ -365,6 +361,7 @@ static int gb_gpio_request_handler(struct gb_operation *op) { struct gb_connection *connection = op->connection; struct gb_gpio_controller *ggc = gb_connection_get_data(connection); + struct gpio_chip *gc = &ggc->chip; struct device *dev = &ggc->gbphy_dev->dev; struct gb_message *request; struct gb_gpio_irq_event_request *event; @@ -391,7 +388,7 @@ static int gb_gpio_request_handler(struct gb_operation *op) return -EINVAL; } - irq = irq_find_mapping(ggc->irqdomain, event->which); + irq = irq_find_mapping(gc->irq.domain, event->which); if (!irq) { dev_err(dev, "failed to find IRQ\n"); return -EINVAL; @@ -506,68 +503,6 @@ static int gb_gpio_controller_setup(struct gb_gpio_controller *ggc) return ret; } -/** - * gb_gpio_irq_map() - maps an IRQ into a GB gpio irqchip - * @d: the irqdomain used by this irqchip - * @irq: the global irq number used by this GB gpio irqchip irq - * @hwirq: the local IRQ/GPIO line offset on this GB gpio - * - * This function will set up the mapping for a certain IRQ line on a - * GB gpio by assigning the GB gpio as chip data, and using the irqchip - * stored inside the GB gpio. - */ -static int gb_gpio_irq_map(struct irq_domain *domain, unsigned int irq, - irq_hw_number_t hwirq) -{ - struct gpio_chip *chip = domain->host_data; - struct gb_gpio_controller *ggc = gpio_chip_to_gb_gpio_controller(chip); - - irq_set_chip_data(irq, ggc); - irq_set_chip_and_handler(irq, ggc->irqchip, ggc->irq_handler); - irq_set_noprobe(irq); - /* - * No set-up of the hardware will happen if IRQ_TYPE_NONE - * is passed as default type. - */ - if (ggc->irq_default_type != IRQ_TYPE_NONE) - irq_set_irq_type(irq, ggc->irq_default_type); - - return 0; -} - -static void gb_gpio_irq_unmap(struct irq_domain *d, unsigned int irq) -{ - irq_set_chip_and_handler(irq, NULL, NULL); - irq_set_chip_data(irq, NULL); -} - -static const struct irq_domain_ops gb_gpio_domain_ops = { - .map = gb_gpio_irq_map, - .unmap = gb_gpio_irq_unmap, -}; - -/** - * gb_gpio_irqchip_remove() - removes an irqchip added to a gb_gpio_controller - * @ggc: the gb_gpio_controller to remove the irqchip from - * - * This is called only from gb_gpio_remove() - */ -static void gb_gpio_irqchip_remove(struct gb_gpio_controller *ggc) -{ - unsigned int offset; - - /* Remove all IRQ mappings and delete the domain */ - if (ggc->irqdomain) { - for (offset = 0; offset < (ggc->line_max + 1); offset++) - irq_dispose_mapping(irq_find_mapping(ggc->irqdomain, - offset)); - irq_domain_remove(ggc->irqdomain); - } - - if (ggc->irqchip) - ggc->irqchip = NULL; -} - /** * gb_gpio_irqchip_add() - adds an irqchip to a gpio chip * @chip: the gpio chip to add the irqchip to @@ -595,8 +530,7 @@ static int gb_gpio_irqchip_add(struct gpio_chip *chip, unsigned int type) { struct gb_gpio_controller *ggc; - unsigned int offset; - unsigned int irq_base; + unsigned int err; if (!chip || !irqchip) return -EINVAL; @@ -606,35 +540,21 @@ static int gb_gpio_irqchip_add(struct gpio_chip *chip, ggc->irqchip = irqchip; ggc->irq_handler = handler; ggc->irq_default_type = type; - ggc->irqdomain = irq_domain_add_simple(NULL, - ggc->line_max + 1, first_irq, - &gb_gpio_domain_ops, chip); - if (!ggc->irqdomain) { - ggc->irqchip = NULL; - return -EINVAL; - } - /* - * Prepare the mapping since the irqchip shall be orthogonal to - * any gpio calls. If the first_irq was zero, this is - * necessary to allocate descriptors for all IRQs. - */ - for (offset = 0; offset < (ggc->line_max + 1); offset++) { - irq_base = irq_create_mapping(ggc->irqdomain, offset); - if (offset == 0) - ggc->irq_base = irq_base; + err = gpiochip_irqchip_add(chip, + irqchip, + first_irq, + ggc->irq_handler, + type + ); + if (err) { + ggc->irqchip = NULL; + return err; } return 0; } -static int gb_gpio_to_irq(struct gpio_chip *chip, unsigned int offset) -{ - struct gb_gpio_controller *ggc = gpio_chip_to_gb_gpio_controller(chip); - - return irq_find_mapping(ggc->irqdomain, offset); -} - static int gb_gpio_probe(struct gbphy_device *gbphy_dev, const struct gbphy_device_id *id) { @@ -693,7 +613,6 @@ static int gb_gpio_probe(struct gbphy_device *gbphy_dev, gpio->get = gb_gpio_get; gpio->set = gb_gpio_set; gpio->set_config = gb_gpio_set_config; - gpio->to_irq = gb_gpio_to_irq; gpio->base = -1; /* Allocate base dynamically */ gpio->ngpio = ggc->line_max + 1; gpio->can_sleep = true; @@ -702,24 +621,23 @@ static int gb_gpio_probe(struct gbphy_device *gbphy_dev, if (ret) goto exit_line_free; - ret = gb_gpio_irqchip_add(gpio, irqc, 0, - handle_level_irq, IRQ_TYPE_NONE); + ret = gpiochip_add(gpio); if (ret) { - dev_err(&gbphy_dev->dev, "failed to add irq chip: %d\n", ret); + dev_err(&gbphy_dev->dev, "failed to add gpio chip: %d\n", ret); goto exit_line_free; } - ret = gpiochip_add(gpio); + ret = gb_gpio_irqchip_add(gpio, irqc, 0, + handle_level_irq, IRQ_TYPE_NONE); if (ret) { - dev_err(&gbphy_dev->dev, "failed to add gpio chip: %d\n", ret); - goto exit_gpio_irqchip_remove; + dev_err(&gbphy_dev->dev, "failed to add irq chip: %d\n", ret); + gpiochip_remove(gpio); + goto exit_line_free; } gbphy_runtime_put_autosuspend(gbphy_dev); return 0; -exit_gpio_irqchip_remove: - gb_gpio_irqchip_remove(ggc); exit_line_free: kfree(ggc->lines); exit_connection_disable: @@ -743,7 +661,6 @@ static void gb_gpio_remove(struct gbphy_device *gbphy_dev) gb_connection_disable_rx(connection); gpiochip_remove(&ggc->chip); - gb_gpio_irqchip_remove(ggc); gb_connection_disable(connection); gb_connection_destroy(connection); kfree(ggc->lines); -- 2.17.1

7 years

[PATCH] greybus: gpio: switch GPIO portions to use GPIOLIB_IRQCHIP

by Nishad Kamdar

7 years

[PATCH 1/3] staging: greybus: loopback.c: remove unused gb_loopback::lbid

by Rasmus Villemoes

It's not obvious how the code prevents adding more than 31 elements to the list and thus invoking undefined behaviour in the 1 << new_lbid expression, and in practice causing ->lbid values to repeat every 32 elements. But the definition of struct gb_loopback is local to loopback.c, and the lbid field is entirely unused outside of this function, so it seems we can just drop it entirely. Signed-off-by: Rasmus Villemoes <linux(a)rasmusvillemoes.dk> --- Since lbid isn't mentioned anywhere else in greybus/, it's hard to figure out how it was meant to be used. It does seem like entirely dead (write-only) code. drivers/staging/greybus/loopback.c | 8 -------- 1 file changed, 8 deletions(-) diff --git a/drivers/staging/greybus/loopback.c b/drivers/staging/greybus/loopback.c index 42f6f3de967c..7080294f705c 100644 --- a/drivers/staging/greybus/loopback.c +++ b/drivers/staging/greybus/loopback.c @@ -97,7 +97,6 @@ struct gb_loopback { u32 timeout_min; u32 timeout_max; u32 outstanding_operations_max; - u32 lbid; u64 elapsed_nsecs; u32 apbridge_latency_ts; u32 gbphy_latency_ts; @@ -1014,16 +1013,9 @@ static int gb_loopback_bus_id_compare(void *priv, struct list_head *lha, static void gb_loopback_insert_id(struct gb_loopback *gb) { - struct gb_loopback *gb_list; - u32 new_lbid = 0; - /* perform an insertion sort */ list_add_tail(&gb->entry, &gb_dev.list); list_sort(NULL, &gb_dev.list, gb_loopback_bus_id_compare); - list_for_each_entry(gb_list, &gb_dev.list, entry) { - gb_list->lbid = 1 << new_lbid; - new_lbid++; - } } #define DEBUGFS_NAMELEN 32 -- 2.19.0

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greybus-dev October 2018