Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit eead75a2 authored by Ashish Jangam's avatar Ashish Jangam Committed by Dmitry Torokhov
Browse files

Input: add support for DA9052/53 touch screen controller 



This driver adds support for DA9052/53 4-wire resistive ADC interfaced
touchscreen controller. DA9052/53 is a multi-function device, therefore
this driver depends on DA9052/53 core.

This patch is functionally tested on Samsung SMDKV6410.

Signed-off-by: default avatarDavid Dajun Chen <dchen@diasemi.com>
Signed-off-by: default avatarAshish Jangam <ashish.jangam@kpitcummins.com>
Signed-off-by: default avatarDmitry Torokhov <dtor@mail.ru>
parent df052676

drivers/input/touchscreen/Kconfig

+17 −0
Original line number Diff line number Diff line
@@ -187,6 +187,23 @@ config TOUCHSCREEN_DA9034 
	  Say Y here to enable the support for the touchscreen found

	  on Dialog Semiconductor DA9034 PMIC.



	  If unsure, say N.



	  To compile this driver as a module, choose M here: the

	  module will be called da9034-ts.



config TOUCHSCREEN_DA9052

	tristate "Dialog DA9052/DA9053 TSI"

	depends on PMIC_DA9052

	help

	  Say Y here to support the touchscreen found on Dialog Semiconductor

	  DA9052-BC and DA9053-AA/Bx PMICs.



	  If unsure, say N.



	  To compile this driver as a module, choose M here: the

	  module will be called da9052_tsi.



config TOUCHSCREEN_DYNAPRO

	tristate "Dynapro serial touchscreen"

	select SERIO

drivers/input/touchscreen/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -22,6 +22,7 @@ obj-$(CONFIG_TOUCHSCREEN_CYTTSP_CORE) += cyttsp_core.o 
obj-$(CONFIG_TOUCHSCREEN_CYTTSP_I2C)	+= cyttsp_i2c.o

obj-$(CONFIG_TOUCHSCREEN_CYTTSP_SPI)	+= cyttsp_spi.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

drivers/input/touchscreen/da9052_tsi.c

0 → 100644
+370 −0
Original line number Diff line number Diff line 
/*

 * TSI driver for Dialog DA9052

 *

 * Copyright(c) 2012 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;

	struct mutex mutex;

	unsigned int irq_pendwn;

	unsigned int irq_datardy;

	bool stopped;

	bool adc_on;

};



static void da9052_ts_adc_toggle(struct da9052_tsi *tsi, bool on)

{

	da9052_reg_update(tsi->da9052, DA9052_TSI_CONT_A_REG, 1 << 0, on);

	tsi->adc_on = on;

}



static irqreturn_t da9052_ts_pendwn_irq(int irq, void *data)

{

	struct da9052_tsi *tsi = data;



	if (!tsi->stopped) {

		/* Mask PEN_DOWN event and unmask TSI_READY event */

		disable_irq_nosync(tsi->irq_pendwn);

		enable_irq(tsi->irq_datardy);



		da9052_ts_adc_toggle(tsi, true);



		schedule_delayed_work(&tsi->ts_pen_work, HZ / 50);

	}



	return IRQ_HANDLED;

}



static void da9052_ts_read(struct da9052_tsi *tsi)

{

	struct input_dev *input = tsi->dev;

	int ret;

	u16 x, y, z;

	u8 v;



	ret = da9052_reg_read(tsi->da9052, DA9052_TSI_X_MSB_REG);

	if (ret < 0)

		return;



	x = (u16) ret;



	ret = da9052_reg_read(tsi->da9052, DA9052_TSI_Y_MSB_REG);

	if (ret < 0)

		return;



	y = (u16) ret;



	ret = da9052_reg_read(tsi->da9052, DA9052_TSI_Z_MSB_REG);

	if (ret < 0)

		return;



	z = (u16) ret;



	ret = da9052_reg_read(tsi->da9052, DA9052_TSI_LSB_REG);

	if (ret < 0)

		return;



	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_key(input, BTN_TOUCH, 1);

	input_report_abs(input, ABS_X, x);

	input_report_abs(input, ABS_Y, y);

	input_report_abs(input, ABS_PRESSURE, z);

	input_sync(input);

}



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);

	if (!tsi->stopped) {

		int ret = da9052_reg_read(tsi->da9052, DA9052_TSI_LSB_REG);

		if (ret < 0 || (ret & TSI_PEN_DOWN_STATUS)) {

			/* Pen is still DOWN (or read error) */

			schedule_delayed_work(&tsi->ts_pen_work, HZ / 50);

		} else {

			struct input_dev *input = tsi->dev;



			/* Pen UP */

			da9052_ts_adc_toggle(tsi, false);



			/* Report Pen UP */

			input_report_key(input, BTN_TOUCH, 0);

			input_report_abs(input, ABS_PRESSURE, 0);

			input_sync(input);



			/*

			 * FIXME: Fixes the unhandled irq issue when quick

			 * pen down and pen up events occurs

			 */

			ret = da9052_reg_update(tsi->da9052,

						DA9052_EVENT_B_REG, 0xC0, 0xC0);

			if (ret < 0)

				return;



			/* Mask TSI_READY event and unmask PEN_DOWN event */

			disable_irq(tsi->irq_datardy);

			enable_irq(tsi->irq_pendwn);

		}

	}

}



static int __devinit da9052_ts_configure_gpio(struct da9052 *da9052)

{

	int error;



	error = da9052_reg_update(da9052, DA9052_GPIO_2_3_REG, 0x30, 0);

	if (error < 0)

		return error;



	error = da9052_reg_update(da9052, DA9052_GPIO_4_5_REG, 0x33, 0);

	if (error < 0)

		return error;



	error = da9052_reg_update(da9052, DA9052_GPIO_6_7_REG, 0x33, 0);

	if (error < 0)

		return error;



	return 0;

}



static int __devinit da9052_configure_tsi(struct da9052_tsi *tsi)

{

	int error;



	error = da9052_ts_configure_gpio(tsi->da9052);

	if (error)

		return error;



	/* Measure TSI sample every 1ms */

	error = da9052_reg_update(tsi->da9052, DA9052_ADC_CONT_REG,

				  1 << 6, 1 << 6);

	if (error < 0)

		return error;



	/* TSI_DELAY: 3 slots, TSI_SKIP: 0 slots, TSI_MODE: XYZP */

	error = da9052_reg_update(tsi->da9052, DA9052_TSI_CONT_A_REG, 0xFC, 0xC0);

	if (error < 0)

		return error;



	/* Supply TSIRef through LD09 */

	error = da9052_reg_write(tsi->da9052, DA9052_LDO9_REG, 0x59);

	if (error < 0)

		return error;



	return 0;

}



static int da9052_ts_input_open(struct input_dev *input_dev)

{

	struct da9052_tsi *tsi = input_get_drvdata(input_dev);



	tsi->stopped = false;

	mb();



	/* Unmask PEN_DOWN event */

	enable_irq(tsi->irq_pendwn);



	/* 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);



	tsi->stopped = true;

	mb();

	disable_irq(tsi->irq_pendwn);

	cancel_delayed_work_sync(&tsi->ts_pen_work);



	if (tsi->adc_on) {

		disable_irq(tsi->irq_datardy);

		da9052_ts_adc_toggle(tsi, false);



		/*

		 * If ADC was on that means that pendwn IRQ was disabled

		 * twice and we need to enable it to keep enable/disable

		 * counter balanced. IRQ is still off though.

		 */

		enable_irq(tsi->irq_pendwn);

	}



	/* 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 *da9052;

	struct da9052_tsi *tsi;

	struct input_dev *input_dev;

	int irq_pendwn;

	int irq_datardy;

	int error;



	da9052 = dev_get_drvdata(pdev->dev.parent);

	if (!da9052)

		return -EINVAL;



	irq_pendwn = platform_get_irq_byname(pdev, "PENDWN");

	irq_datardy = platform_get_irq_byname(pdev, "TSIRDY");

	if (irq_pendwn < 0 || irq_datardy < 0) {

		dev_err(da9052->dev, "Unable to determine device interrupts\n");

		return -ENXIO;

	}



	tsi = kzalloc(sizeof(struct da9052_tsi), GFP_KERNEL);

	input_dev = input_allocate_device();

	if (!tsi || !input_dev) {

		error = -ENOMEM;

		goto err_free_mem;

	}



	tsi->da9052 = da9052;

	tsi->dev = input_dev;

	tsi->irq_pendwn = da9052->irq_base + irq_pendwn;

	tsi->irq_datardy = da9052->irq_base + irq_datardy;

	tsi->stopped = true;

	INIT_DELAYED_WORK(&tsi->ts_pen_work, da9052_ts_pen_work);



	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);



	input_set_drvdata(input_dev, tsi);



	/* Disable Pen Detect Circuit */

	da9052_reg_update(tsi->da9052, DA9052_TSI_CONT_A_REG, 1 << 1, 0);



	/* Disable ADC */

	da9052_ts_adc_toggle(tsi, false);



	error = request_threaded_irq(tsi->irq_pendwn,

				     NULL, da9052_ts_pendwn_irq,

				     IRQF_TRIGGER_LOW | IRQF_ONESHOT,

				     "PENDWN", tsi);

	if (error) {

		dev_err(tsi->da9052->dev,

			"Failed to register PENDWN IRQ %d, error = %d\n",

			tsi->irq_pendwn, error);

		goto err_free_mem;

	}



	error = request_threaded_irq(tsi->irq_datardy,

				     NULL, da9052_ts_datardy_irq,

				     IRQF_TRIGGER_LOW | IRQF_ONESHOT,

				     "TSIRDY", tsi);

	if (error) {

		dev_err(tsi->da9052->dev,

			"Failed to register TSIRDY IRQ %d, error = %d\n",

			tsi->irq_datardy, error);

		goto err_free_pendwn_irq;

	}



	/* Mask PEN_DOWN and TSI_READY events */

	disable_irq(tsi->irq_pendwn);

	disable_irq(tsi->irq_datardy);



	error = da9052_configure_tsi(tsi);

	if (error)

		goto err_free_datardy_irq;



	error = input_register_device(tsi->dev);

	if (error)

		goto err_free_datardy_irq;



	platform_set_drvdata(pdev, tsi);



	return 0;



err_free_datardy_irq:

	free_irq(tsi->irq_datardy, tsi);

err_free_pendwn_irq:

	free_irq(tsi->irq_pendwn, tsi);

err_free_mem:

	kfree(tsi);

	input_free_device(input_dev);



	return error;

}



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->irq_pendwn, tsi);

	free_irq(tsi->irq_datardy, tsi);



	input_unregister_device(tsi->dev);

	kfree(tsi);



	platform_set_drvdata(pdev, NULL);



	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,

	},

};



module_platform_driver(da9052_tsi_driver);



MODULE_DESCRIPTION("Touchscreen driver for Dialog Semiconductor DA9052");

MODULE_AUTHOR("Anthony Olech <Anthony.Olech@diasemi.com>");

MODULE_LICENSE("GPL");

MODULE_ALIAS("platform:da9052-tsi");