This driver add support for DA9052 4-wire resistive ADC interfaced touchscreen controller.
DA9052 is a MFD therefore this driver depends on DA9052 core driver for core functionalities.
Signed-off-by: David Dajun Chen dchen@diasemi.com Signed-off-by: Ashish Jangam ashish.jangam@kpitcummins.com --- drivers/input/touchscreen/Kconfig | 7 + drivers/input/touchscreen/Makefile | 1 + drivers/input/touchscreen/da9052_tsi.c | 489 ++++++++++++++++++++++++++++++++ 3 files changed, 497 insertions(+), 0 deletions(-) create mode 100755 drivers/input/touchscreen/da9052_tsi.c diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig index cabd9e5..a5d2e7b 100644 --- a/drivers/input/touchscreen/Kconfig +++ b/drivers/input/touchscreen/Kconfig @@ -144,6 +144,13 @@ config TOUCHSCREEN_DA9034 Say Y here to enable the support for the touchscreen found on Dialog Semiconductor DA9034 PMIC.
+config TOUCHSCREEN_DA9052 + tristate "Dialog DA9052 TSI" + depends on PMIC_DA9052 + help + Say y here to support the touchscreen found on + Dialog Semiconductor DA9052 PMIC + config TOUCHSCREEN_DYNAPRO tristate "Dynapro serial touchscreen" select SERIO diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile index 282d6f7..a4aeb25 100644 --- a/drivers/input/touchscreen/Makefile +++ b/drivers/input/touchscreen/Makefile @@ -18,6 +18,7 @@ obj-$(CONFIG_TOUCHSCREEN_BITSY) += h3600_ts_input.o obj-$(CONFIG_TOUCHSCREEN_BU21013) += bu21013_ts.o obj-$(CONFIG_TOUCHSCREEN_CY8CTMG110) += cy8ctmg110_ts.o obj-$(CONFIG_TOUCHSCREEN_DA9034) += da9034-ts.o +obj-$(CONFIG_TOUCHSCREEN_DA9052) += da9052_tsi.o obj-$(CONFIG_TOUCHSCREEN_DYNAPRO) += dynapro.o obj-$(CONFIG_TOUCHSCREEN_HAMPSHIRE) += hampshire.o obj-$(CONFIG_TOUCHSCREEN_GUNZE) += gunze.o diff --git a/drivers/input/touchscreen/da9052_tsi.c b/drivers/input/touchscreen/da9052_tsi.c new file mode 100755 index 0000000..dade0a9 --- /dev/null +++ b/drivers/input/touchscreen/da9052_tsi.c @@ -0,0 +1,489 @@ +/* + * TSI driver for Dialog DA9052 + * + * Copyright(c) 2011 Dialog Semiconductor Ltd. + * + * Author: David Dajun Chen dchen@diasemi.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. + * + */ +#include <linux/module.h> +#include <linux/input.h> +#include <linux/delay.h> +#include <linux/platform_device.h> +#include <linux/freezer.h> +#include <linux/kthread.h> +#include <linux/kfifo.h> + +#include <linux/mfd/da9052/reg.h> +#include <linux/mfd/da9052/da9052.h> + +#define DA9052_ACTIVE 1 +#define DA9052_INACTIVE 0 + +#define DA9052_TSI_FIFOSIZE 640 + +enum { + DA9052_PEN_IDLE, + DA9052_PEN_DOWN, + DA9052_PEN_UP +}; + +struct da9052_tsi_reg { + u16 x; + u16 y; +}; + +struct tsi_thread_type { + u8 pid; + u8 state; + struct completion notifier; + struct task_struct *thread_task; +}; + +struct da9052_tsi { + struct da9052 *da9052; + struct input_dev *dev; + struct tsi_thread_type tsi_pen_state_thread; + struct tsi_thread_type tsi_filter_thread; + struct kfifo fifo; + struct kfifo fifo_buf; + u8 pen_up_detect_interval; + u32 zero_data_cnt; + u32 valid_penup_count; + u8 pen_state; + int irq_pendwn; + int irq_datardy; +}; + +static inline int da9052_ts_start(struct da9052_tsi *tsi) +{ + return da9052_reg_update(tsi->da9052, DA9052_TSI_CONT_A_REG, + 1 << 0, 1 << 0); +} + +static inline int da9052_ts_stop(struct da9052_tsi *tsi) +{ + return da9052_clear_bits(tsi->da9052, DA9052_TSI_CONT_A_REG, 1 << 0); +} + +static irqreturn_t da9052_ts_pendwn_irq(int irq, void *data) +{ + struct da9052_tsi *tsi = (struct da9052_tsi *)data; + struct da9052 *da9052 = tsi->da9052; + int ret; + + da9052->events_mask |= DA9052_E_PEN_DOWN; + da9052->events_mask &= ~DA9052_E_TSI_READY; + + /* Mask PEN_DOWN event and unmask TSI_READY event*/ + ret = da9052_reg_update(da9052, DA9052_IRQ_MASK_B_REG, 0x80, 0x40); + if (ret < 0) + return IRQ_NONE; + + da9052_ts_start(tsi); + tsi->pen_state = DA9052_PEN_DOWN; + + return IRQ_HANDLED; +} + +static int da9052_ts_read(struct da9052_tsi *tsi) +{ + struct da9052_tsi_reg co_ord = {0, 0}; + int ret; + uint8_t _x, _y, _v; + + ret = da9052_reg_read(tsi->da9052, DA9052_TSI_X_MSB_REG); + if (ret < 0) + return ret; + + _x = (uint8_t) ret; + + ret = da9052_reg_read(tsi->da9052, DA9052_TSI_Y_MSB_REG); + if (ret < 0) + return ret; + + _y = (uint8_t) ret; + + ret = da9052_reg_read(tsi->da9052, DA9052_TSI_LSB_REG); + if (ret < 0) + return ret; + + _v = (uint8_t) ret; + + co_ord.x = ((_x << 2) & 0x3fc) | (_v & 0x3); + co_ord.y = ((_y << 2) & 0x3fc) | ((_v & 0xc) >> 2); + + ret = kfifo_in(&tsi->fifo, &co_ord, sizeof(struct da9052_tsi_reg)); + + return 0; +} + +static irqreturn_t da9052_ts_datardy_irq(int irq, void *data) +{ + struct da9052_tsi *tsi = (struct da9052_tsi *)data; + int ret; + + ret = da9052_ts_read(tsi); + if (ret) { + dev_err(tsi->da9052->dev, + "Failed to read TSI co-ordinate, %d\n", ret); + return IRQ_NONE; + } + + return IRQ_HANDLED; +} + +/* +* Two FIFO are been used. FIFO1 is used for detecting pen up and +* FIFO2 for reporting pen down co-ordinate. +*/ +void da9052_ts_process_reg_data(struct da9052_tsi *tsi) +{ + struct da9052_tsi_reg tmp_raw_data; + u32 reg_data_cnt; + int ret; + + reg_data_cnt = kfifo_len(&tsi->fifo); + + while (reg_data_cnt-- > 0) { + ret = kfifo_out(&tsi->fifo, &tmp_raw_data, + sizeof(struct da9052_tsi_reg)); + if (ret < 0) + continue; + kfifo_in(&tsi->fifo_buf, &tmp_raw_data, + sizeof(struct da9052_tsi_reg)); + } + return; +} + +static void da9052_ts_report_penup(struct da9052_tsi *tsi) +{ + struct input_dev *ip_dev = tsi->dev; + struct da9052 *da9052 = tsi->da9052; + ssize_t ret; + + ret = da9052_ts_stop(tsi); + if (ret < 0) + return; + + da9052->events_mask |= DA9052_E_TSI_READY; + da9052->events_mask &= ~DA9052_E_PEN_DOWN; + + /* Mask TSI_READY event and unmask PEN_DOWN event*/ + ret = da9052_reg_update(da9052, DA9052_IRQ_MASK_B_REG, 0x40, 0x80); + if (ret < 0) + return; + + input_report_abs(ip_dev, BTN_TOUCH, 0); + input_sync(ip_dev); + + tsi->zero_data_cnt = 0; +} + +/* +* This function detects the pen up state using the kfifo len. +* If kfifo len is zero for some interval then pen up is reported. +* Else pen co-ordinate are reported. +*/ +static int da9052_ts_monitor_pen_state(void *data) +{ + struct da9052_tsi *tsi = (struct da9052_tsi *) data; + u32 data_cnt; + + set_freezable(); + + while (tsi->tsi_pen_state_thread.state == DA9052_ACTIVE) { + try_to_freeze(); + + set_current_state(TASK_INTERRUPTIBLE); + schedule_timeout(msecs_to_jiffies(10)); + + if (tsi->pen_state != DA9052_PEN_DOWN) + continue; + + data_cnt = kfifo_len(&tsi->fifo); + if (data_cnt < 0) + continue; + + da9052_ts_process_reg_data(tsi); + + if (data_cnt) + tsi->zero_data_cnt = 0; + else { + if ((++(tsi->zero_data_cnt)) > + tsi->valid_penup_count) { + tsi->pen_state = DA9052_PEN_UP; + da9052_ts_report_penup(tsi); + } + } + } + + complete_and_exit(&tsi->tsi_pen_state_thread.notifier, 0); + return 0; +} + +static int da9052_ts_process_thread(void *ptr) +{ + struct da9052_tsi_reg co_ord; + int cnt = 0, ret; + struct da9052_tsi *tsi = (struct da9052_tsi *)ptr; + + set_freezable(); + + while (tsi->tsi_filter_thread.state == DA9052_ACTIVE) { + + try_to_freeze(); + + set_current_state(TASK_INTERRUPTIBLE); + schedule_timeout(msecs_to_jiffies(10)); + cnt = kfifo_len(&tsi->fifo_buf); + if (cnt <= 0) + continue; + + ret = kfifo_out(&tsi->fifo_buf, &co_ord, + sizeof(struct da9052_tsi_reg)); + if (ret < 0) + continue; + + input_report_abs(tsi->dev, BTN_TOUCH, 1); + input_report_abs(tsi->dev, ABS_X, co_ord.x); + input_report_abs(tsi->dev, ABS_Y, co_ord.y); + input_sync(tsi->dev); + } + + tsi->tsi_filter_thread.thread_task = NULL; + complete_and_exit(&tsi->tsi_filter_thread.notifier, 0); + + return 0; +} + +static int da9052_ts_configure_gpio(struct da9052 *da9052) +{ + int ret; + + ret = da9052_clear_bits(da9052, DA9052_GPIO_2_3_REG, 0x30); + if (ret < 0) + return -EIO; + + ret = da9052_clear_bits(da9052, DA9052_GPIO_4_5_REG, 0x33); + if (ret < 0) + return -EIO; + + ret = da9052_clear_bits(da9052, DA9052_GPIO_6_7_REG, 0x33); + if (ret < 0) + return -EIO; + + return ret; +} + +static int __init da9052_ts_enable_device(struct da9052_tsi *tsi) +{ + ssize_t ret; + struct da9052 *da9052 = tsi->da9052; + + ret = da9052_ts_configure_gpio(tsi->da9052); + if (ret < 0) + return ret; + + ret = da9052_reg_update(tsi->da9052, DA9052_TSI_CONT_A_REG, 0xFC, 0xC0); + if (ret < 0) + return ret; + + tsi->valid_penup_count = 5; + + init_completion(&tsi->tsi_pen_state_thread.notifier); + tsi->tsi_pen_state_thread.state = DA9052_ACTIVE; + tsi->tsi_pen_state_thread.pid = kernel_thread(da9052_ts_monitor_pen_state, tsi, + CLONE_KERNEL | SIGCHLD); + + init_completion(&tsi->tsi_filter_thread.notifier); + tsi->tsi_filter_thread.state = DA9052_ACTIVE; + tsi->tsi_filter_thread.pid = kernel_thread(da9052_ts_process_thread, tsi, + CLONE_KERNEL | SIGCHLD); + + tsi->zero_data_cnt = 0; + + /* Measure TSI sample every 1ms */ + ret = da9052_reg_update(tsi->da9052, DA9052_ADC_CONT_REG, + 1 << 6, 1 << 6); + if (ret < 0) + return ret; + + /* TSI_DELAY: 4 slots, TSI_SKIP: 0 slots, TSI_MODE: XYZP */ + ret = da9052_reg_update(tsi->da9052, DA9052_TSI_CONT_A_REG, + 1 << 1, 1 << 1); + if (ret < 0) + return ret; + + da9052->events_mask |= DA9052_E_TSI_READY; + + /* Mask TSI_READY event*/ + ret = da9052_reg_update(da9052, DA9052_IRQ_MASK_B_REG, 0, 0x80); + if (ret < 0) + return ret; + + /*Supply TSIRef thru LD09 */ + ret = da9052_reg_write(tsi->da9052, DA9052_LDO9_REG, 0x59); + + return ret; +} + +static s32 __devinit da9052_ts_probe(struct platform_device *pdev) +{ + struct da9052_tsi *tsi; + struct input_dev *input_dev; + struct da9052 *da9052; + int ret; + + da9052 = dev_get_drvdata(pdev->dev.parent); + + tsi = kzalloc(sizeof(struct da9052_tsi), GFP_KERNEL); + if (!tsi) + return -ENOMEM; + + input_dev = input_allocate_device(); + if (!input_dev) { + dev_err(tsi->da9052->dev, + "failed to allocate input device\n"); + ret = -ENOMEM; + goto err_mem; + } + + ret = kfifo_alloc(&tsi->fifo, DA9052_TSI_FIFOSIZE, GFP_KERNEL); + if (ret < 0) + goto err_input; + + ret = kfifo_alloc(&tsi->fifo_buf, DA9052_TSI_FIFOSIZE, GFP_KERNEL); + if (ret < 0) + goto err_fifo; + + tsi->da9052 = da9052; + tsi->pen_up_detect_interval = 5; + platform_set_drvdata(pdev, tsi); + + input_dev->id.version = 0x0101; + input_dev->id.vendor = 0x15B6; + input_dev->id.product = 0x9052; + input_dev->id.bustype = BUS_RS232; + input_dev->name = "Dialog DA9052 TouchScreen Driver"; + input_dev->dev.parent = &pdev->dev; + __set_bit(EV_ABS, input_dev->evbit); + __set_bit(EV_KEY, input_dev->evbit); + __set_bit(BTN_TOUCH, input_dev->keybit); + __set_bit(ABS_X, input_dev->absbit); + __set_bit(ABS_Y, input_dev->absbit); + + input_set_abs_params(input_dev, ABS_X, 0, 1023, 0, 0); + input_set_abs_params(input_dev, ABS_Y, 0, 1023, 0, 0); + input_set_abs_params(input_dev, ABS_PRESSURE, 0, 1023, 0, 0); + + tsi->dev = input_dev; + input_set_drvdata(input_dev, tsi); + ret = input_register_device(tsi->dev); + if (ret) + goto err_mem; + + tsi->irq_pendwn = platform_get_irq_byname(pdev, "PENDWN"); + ret = request_threaded_irq(tsi->da9052->irq_base + tsi->irq_pendwn, + NULL, da9052_ts_pendwn_irq, + IRQF_TRIGGER_LOW | IRQF_ONESHOT, + "PENDWN", tsi); + if (ret < 0) { + dev_err(tsi->da9052->dev, + "Failed to register %s IRQ %d, error = %d\n", "PENDWN", + tsi->da9052->irq_base + tsi->irq_pendwn, ret); + goto err_fifo_buf; + } + + tsi->irq_datardy = platform_get_irq_byname(pdev, "TSIRDY"); + ret = request_threaded_irq(tsi->da9052->irq_base + tsi->irq_datardy, + NULL, da9052_ts_datardy_irq, + IRQF_TRIGGER_LOW | IRQF_ONESHOT, + "TSIRDY", tsi); + if (ret < 0) { + dev_err(tsi->da9052->dev, + "Failed to register %s IRQ %d, error = %d\n", "TSIRDY", + tsi->da9052->irq_base + tsi->irq_datardy, ret); + goto err_fifo_buf; + } + + ret = da9052_ts_enable_device(tsi); + if (ret < 0) + goto err_fifo_buf; + + return 0; + +err_fifo_buf: + kfifo_free(&tsi->fifo_buf); +err_fifo: + kfifo_free(&tsi->fifo); +err_input: + input_free_device(input_dev); +err_mem: + kfree(tsi); + return ret; +} + +static int __devexit da9052_ts_remove(struct platform_device *pdev) +{ + struct da9052_tsi *tsi = platform_get_drvdata(pdev); + s32 ret; + + ret = da9052_clear_bits(tsi->da9052, DA9052_TSI_CONT_A_REG, 1 << 0); + if (ret < 0) + return ret; + + ret = da9052_reg_write(tsi->da9052, DA9052_LDO9_REG, 0x19); + if (ret < 0) + return ret; + + free_irq(tsi->da9052->irq_base + tsi->irq_pendwn, NULL); + free_irq(tsi->da9052->irq_base + tsi->irq_datardy, NULL); + + tsi->tsi_pen_state_thread.state = DA9052_INACTIVE; + wait_for_completion(&tsi->tsi_pen_state_thread.notifier); + + tsi->tsi_filter_thread.state = DA9052_INACTIVE; + wait_for_completion(&tsi->tsi_filter_thread.notifier); + + input_unregister_device(tsi->dev); + + platform_set_drvdata(pdev, NULL); + + kfifo_free(&tsi->fifo); + kfifo_free(&tsi->fifo_buf); + kfree(tsi); + + return 0; +} + +static struct platform_driver da9052_tsi_driver = { + .probe = da9052_ts_probe, + .remove = __devexit_p(da9052_ts_remove), + .driver = { + .name = "da9052-tsi", + .owner = THIS_MODULE, + }, +}; + +static int __init da9052_ts_init(void) +{ + return platform_driver_register(&da9052_tsi_driver); +} +module_init(da9052_ts_init); + +static void __exit da9052_ts_exit(void) +{ + platform_driver_unregister(&da9052_tsi_driver); +} +module_exit(da9052_ts_exit); + +MODULE_DESCRIPTION("Touchscreen driver for Dialog Semiconductor DA9052"); +MODULE_AUTHOR("David Dajun Chen dchen@diasemi.com"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:da9052-tsi");