This driver adds 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 --- Changes since v5: - Use kenel APIs for enabling and disabling irqs Changes since v4: - Add string "compile this driver as module" in kconfig - Replace struct da9052_tsi_reg with temp variable - Call schedule_delayed_work() from pen down irq handler - Mask data ready irq in pen up work - Disable IRQs in device close and enable it in device open - Remove set_bit() for ABS X,Y,Pressure as input_set_abs_params() does it Changes since v3: - Remove unrequire type cast - Prefix init code with _devinit - Remove check for workqueue reschedule - tsi_close() to wait for datardy intr completion - Remove seperate workqueue - Move cancel_work_sync to tsi_close() - Check for drv data before tsi priv data allocation Changes since v2: - Replace kthreads with workqueue - Remove kfifos - Taken care for bus type - Replace da9052_set/clear function with da9052_reg_update - Add open and close functionality --- drivers/input/touchscreen/Kconfig | 7 + drivers/input/touchscreen/Makefile | 1 + drivers/input/touchscreen/da9052_tsi.c | 364 ++++++++++++++++++++++++++++++++ 3 files changed, 372 insertions(+), 0 deletions(-) create mode 100644 drivers/input/touchscreen/da9052_tsi.c diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig index 4af2a18..d7a1597 100644 --- a/drivers/input/touchscreen/Kconfig +++ b/drivers/input/touchscreen/Kconfig @@ -157,6 +157,13 @@ 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 496091e..b1ee4b7 100644 --- a/drivers/input/touchscreen/Makefile +++ b/drivers/input/touchscreen/Makefile @@ -19,6 +19,7 @@ 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 100644 index 0000000..61ab7b0 --- /dev/null +++ b/drivers/input/touchscreen/da9052_tsi.c @@ -0,0 +1,364 @@ +/* + * 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/interrupt.h> + +#include <linux/mfd/da9052/reg.h> +#include <linux/mfd/da9052/da9052.h> + +#define TSI_PEN_DOWN_STATUS 0x40 + +struct da9052_tsi { + struct da9052 *da9052; + struct input_dev *dev; + struct delayed_work ts_pen_work; + int irq_pendwn; + int irq_datardy; +}; + +static int da9052_ts_start(struct da9052_tsi *tsi) +{ + return da9052_reg_update(tsi->da9052, DA9052_TSI_CONT_A_REG, + 1 << 0, 1 << 0); +} + +static int da9052_ts_stop(struct da9052_tsi *tsi) +{ + return da9052_reg_update(tsi->da9052, DA9052_TSI_CONT_A_REG, 1 << 0, 0); +} + +static irqreturn_t da9052_ts_pendwn_irq(int irq, void *data) +{ + struct da9052_tsi *tsi = data; + struct da9052 *da9052 = tsi->da9052; + + /* Mask PEN_DOWN event and unmask TSI_READY event */ + disable_irq_nosync(da9052->irq_base + tsi->irq_pendwn); + enable_irq(da9052->irq_base + tsi->irq_datardy); + + da9052_ts_start(tsi); + + input_report_key(tsi->dev, BTN_TOUCH, 1); + input_sync(tsi->dev); + + schedule_delayed_work(&tsi->ts_pen_work, HZ/50); + + return IRQ_HANDLED; +} + +static int da9052_ts_read(struct da9052_tsi *tsi) +{ + int ret = 0; + u16 x, y, z; + u8 v; + + ret = da9052_reg_read(tsi->da9052, DA9052_TSI_X_MSB_REG); + if (ret < 0) + goto exit; + + x = (u16) ret; + + ret = da9052_reg_read(tsi->da9052, DA9052_TSI_Y_MSB_REG); + if (ret < 0) + goto exit; + + y = (u16) ret; + + ret = da9052_reg_read(tsi->da9052, DA9052_TSI_Z_MSB_REG); + if (ret < 0) + goto exit; + + z = (u16) ret; + + ret = da9052_reg_read(tsi->da9052, DA9052_TSI_LSB_REG); + if (ret < 0) + goto exit; + + v = (u8) ret; + + x = ((x << 2) & 0x3fc) | (v & 0x3); + y = ((y << 2) & 0x3fc) | ((v & 0xc) >> 2); + z = ((z << 2) & 0x3fc) | ((v & 0x30) >> 4); + + input_report_abs(tsi->dev, ABS_X, x); + input_report_abs(tsi->dev, ABS_Y, y); + input_report_abs(tsi->dev, ABS_PRESSURE, z); + input_report_key(tsi->dev, BTN_TOUCH, 1); + input_sync(tsi->dev); + +exit: + return ret; +} + +static irqreturn_t da9052_ts_datardy_irq(int irq, void *data) +{ + struct da9052_tsi *tsi = data; + + da9052_ts_read(tsi); + return IRQ_HANDLED; +} + +static void da9052_ts_pen_work(struct work_struct *work) +{ + struct da9052_tsi *tsi = container_of(work, struct da9052_tsi, + ts_pen_work.work); + struct input_dev *ip_dev = tsi->dev; + struct da9052 *da9052 = tsi->da9052; + int ret; + + ret = da9052_reg_read(tsi->da9052, DA9052_TSI_LSB_REG); + if (ret < 0) + return; + + if (ret & TSI_PEN_DOWN_STATUS) /* Pen Down */ + schedule_delayed_work(&tsi->ts_pen_work, HZ/50); + else { + /* Pen UP */ + da9052_ts_stop(tsi); + + /* Mask TSI_READY event and unmask PEN_DOWN event */ + disable_irq(da9052->irq_base + tsi->irq_datardy); + enable_irq(da9052->irq_base + tsi->irq_pendwn); + + /* Report Pen UP */ + input_report_abs(ip_dev, ABS_PRESSURE, 0); + input_report_key(ip_dev, BTN_TOUCH, 0); + input_sync(ip_dev); + } +} + +static int __devinit da9052_ts_configure_gpio(struct da9052 *da9052) +{ + int ret; + + ret = da9052_reg_update(da9052, DA9052_GPIO_2_3_REG, 0x30, 0); + if (ret < 0) + return ret; + + ret = da9052_reg_update(da9052, DA9052_GPIO_4_5_REG, 0x33, 0); + if (ret < 0) + return ret; + + ret = da9052_reg_update(da9052, DA9052_GPIO_6_7_REG, 0x33, 0); + + return ret; +} + +static int __devinit da9052_configure_tsi(struct da9052_tsi *tsi) +{ + ssize_t ret; + struct da9052 *da9052 = tsi->da9052; + + ret = da9052_ts_configure_gpio(tsi->da9052); + if (ret < 0) + return ret; + + /* 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: 3 slots, TSI_SKIP: 0 slots, TSI_MODE: XYZP */ + ret = da9052_reg_update(tsi->da9052, DA9052_TSI_CONT_A_REG, 0xFC, 0xC0); + if (ret < 0) + return ret; + + /* Mask PEN_DOWN and TSI_READY events */ + disable_irq(da9052->irq_base + tsi->irq_pendwn); + disable_irq(da9052->irq_base + tsi->irq_datardy); + + /*Supply TSIRef through LD09 */ + ret = da9052_reg_write(tsi->da9052, DA9052_LDO9_REG, 0x59); + + return ret; +} + +static int da9052_ts_input_open(struct input_dev *input_dev) +{ + struct da9052_tsi *tsi = input_get_drvdata(input_dev); + + /* Unmask PEN_DOWN and TSI_READY events */ + enable_irq(tsi->da9052->irq_base + tsi->irq_pendwn); + enable_irq(tsi->da9052->irq_base + tsi->irq_datardy); + + /* Enable Pen Detect Circuit */ + return da9052_reg_update(tsi->da9052, DA9052_TSI_CONT_A_REG, + 1 << 1, 1 << 1); +} + +static void da9052_ts_input_close(struct input_dev *input_dev) +{ + struct da9052_tsi *tsi = input_get_drvdata(input_dev); + + /* Mask PEN_DOWN and TSI_READY events */ + disable_irq(tsi->da9052->irq_base + tsi->irq_pendwn); + disable_irq(tsi->da9052->irq_base + tsi->irq_datardy); + + cancel_delayed_work_sync(&tsi->ts_pen_work); + + da9052_ts_stop(tsi); + + /* Disable Pen Detect Circuit */ + da9052_reg_update(tsi->da9052, DA9052_TSI_CONT_A_REG, 1 << 1, 0); +} + +static int __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); + if (da9052 == NULL) + return -EINVAL; + + 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; + } + + INIT_DELAYED_WORK(&tsi->ts_pen_work, da9052_ts_pen_work); + + tsi->da9052 = da9052; + + input_dev->id.version = 0x0101; + input_dev->id.vendor = 0x15B6; + input_dev->id.product = 0x9052; + input_dev->name = "Dialog DA9052 TouchScreen Driver"; + input_dev->dev.parent = &pdev->dev; + input_dev->open = da9052_ts_input_open; + input_dev->close = da9052_ts_input_close; + __set_bit(EV_ABS, input_dev->evbit); + __set_bit(EV_KEY, input_dev->evbit); + __set_bit(BTN_TOUCH, input_dev->keybit); + + 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); + + tsi->irq_pendwn = platform_get_irq_byname(pdev, "PENDWN"); + if (tsi->irq_pendwn < 0) { + ret = tsi->irq_pendwn; + goto err_input; + } + + 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_input; + } + + tsi->irq_datardy = platform_get_irq_byname(pdev, "TSIRDY"); + if (tsi->irq_datardy < 0) { + ret = tsi->irq_datardy; + goto err_pendwn_irq; + } + + 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_pendwn_irq; + } + + ret = da9052_configure_tsi(tsi); + if (ret < 0) + goto err_datardy_irq; + + ret = input_register_device(tsi->dev); + if (ret < 0) + goto err_datardy_irq; + + platform_set_drvdata(pdev, tsi); + + return 0; + +err_datardy_irq: + free_irq(tsi->da9052->irq_base + tsi->irq_datardy, tsi); +err_pendwn_irq: + free_irq(tsi->da9052->irq_base + tsi->irq_pendwn, tsi); +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); + + da9052_reg_write(tsi->da9052, DA9052_LDO9_REG, 0x19); + + free_irq(tsi->da9052->irq_base + tsi->irq_pendwn, tsi); + free_irq(tsi->da9052->irq_base + tsi->irq_datardy, tsi); + + input_unregister_device(tsi->dev); + + platform_set_drvdata(pdev, NULL); + + 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");