Input: add driver for EETI touchpanels (10494dce) · Commits · e / devices / android_kernel_xiaomi_markw

drivers/input/touchscreen/Kconfig

+9 −0

Original line number	Diff line number	Diff line
		@@ -111,6 +111,15 @@ config TOUCHSCREEN_DA9034
		Say Y here to enable the support for the touchscreen found
		on Dialog Semiconductor DA9034 PMIC.

		config TOUCHSCREEN_EETI
		tristate "EETI touchscreen panel support"
		depends on I2C
		help
		Say Y here to enable support for I2C connected EETI touch panels.

		To compile this driver as a module, choose M here: the
		module will be called eeti_ts.

		config TOUCHSCREEN_FUJITSU
		tristate "Fujitsu serial touchscreen"
		select SERIO

drivers/input/touchscreen/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -13,6 +13,7 @@ obj-$(CONFIG_TOUCHSCREEN_ATMEL_TSADCC) += atmel_tsadcc.o
		obj-$(CONFIG_TOUCHSCREEN_BITSY) += h3600_ts_input.o
		obj-$(CONFIG_TOUCHSCREEN_CORGI) += corgi_ts.o
		obj-$(CONFIG_TOUCHSCREEN_GUNZE) += gunze.o
		obj-$(CONFIG_TOUCHSCREEN_EETI) += eeti_ts.o
		obj-$(CONFIG_TOUCHSCREEN_ELO) += elo.o
		obj-$(CONFIG_TOUCHSCREEN_FUJITSU) += fujitsu_ts.o
		obj-$(CONFIG_TOUCHSCREEN_INEXIO) += inexio.o

drivers/input/touchscreen/eeti_ts.c

0 → 100644

+286 −0

Original line number	Diff line number	Diff line
		/*
		* Touch Screen driver for EETI's I2C connected touch screen panels
		* Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
		*
		* See EETI's software guide for the protocol specification:
		* http://home.eeti.com.tw/web20/eg/guide.htm
		*
		* Based on migor_ts.c
		* Copyright (c) 2008 Magnus Damm
		* Copyright (c) 2007 Ujjwal Pande <ujjwal@kenati.com>
		*
		* This file 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 file 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.
		*
		* You should have received a copy of the GNU General Public
		* License along with this library; if not, write to the Free Software
		* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
		*/

		#include <linux/module.h>
		#include <linux/moduleparam.h>
		#include <linux/kernel.h>
		#include <linux/input.h>
		#include <linux/interrupt.h>
		#include <linux/i2c.h>
		#include <linux/timer.h>
		#include <linux/gpio.h>

		static int flip_x;
		module_param(flip_x, bool, 0644);
		MODULE_PARM_DESC(flip_x, "flip x coordinate");

		static int flip_y;
		module_param(flip_y, bool, 0644);
		MODULE_PARM_DESC(flip_y, "flip y coordinate");

		struct eeti_ts_priv {
		struct i2c_client *client;
		struct input_dev *input;
		struct work_struct work;
		struct mutex mutex;
		int irq;
		};

		#define EETI_TS_BITDEPTH (11)
		#define EETI_MAXVAL ((1 << (EETI_TS_BITDEPTH + 1)) - 1)

		#define REPORT_BIT_PRESSED (1 << 0)
		#define REPORT_BIT_AD0 (1 << 1)
		#define REPORT_BIT_AD1 (1 << 2)
		#define REPORT_BIT_HAS_PRESSURE (1 << 6)
		#define REPORT_RES_BITS(v) (((v) >> 1) + EETI_TS_BITDEPTH)

		static void eeti_ts_read(struct work_struct *work)
		{
		char buf[6];
		unsigned int x, y, res, pressed, to = 100;
		struct eeti_ts_priv *priv =
		container_of(work, struct eeti_ts_priv, work);

		mutex_lock(&priv->mutex);

		while (!gpio_get_value(irq_to_gpio(priv->irq)) && --to)
		i2c_master_recv(priv->client, buf, sizeof(buf));

		if (!to) {
		dev_err(&priv->client->dev,
		"unable to clear IRQ - line stuck?\n");
		goto out;
		}

		/* drop non-report packets */
		if (!(buf[0] & 0x80))
		goto out;

		pressed = buf[0] & REPORT_BIT_PRESSED;
		res = REPORT_RES_BITS(buf[0] & (REPORT_BIT_AD0 \| REPORT_BIT_AD1));
		x = buf[2] \| (buf[1] << 8);
		y = buf[4] \| (buf[3] << 8);

		/* fix the range to 11 bits */
		x >>= res - EETI_TS_BITDEPTH;
		y >>= res - EETI_TS_BITDEPTH;

		if (flip_x)
		x = EETI_MAXVAL - x;

		if (flip_y)
		y = EETI_MAXVAL - y;

		if (buf[0] & REPORT_BIT_HAS_PRESSURE)
		input_report_abs(priv->input, ABS_PRESSURE, buf[5]);

		input_report_abs(priv->input, ABS_X, x);
		input_report_abs(priv->input, ABS_Y, y);
		input_report_key(priv->input, BTN_TOUCH, !!pressed);
		input_sync(priv->input);

		out:
		mutex_unlock(&priv->mutex);
		}

		static irqreturn_t eeti_ts_isr(int irq, void *dev_id)
		{
		struct eeti_ts_priv *priv = dev_id;

		/* postpone I2C transactions as we are atomic */
		schedule_work(&priv->work);

		return IRQ_HANDLED;
		}

		static int eeti_ts_open(struct input_dev *dev)
		{
		struct eeti_ts_priv *priv = input_get_drvdata(dev);

		enable_irq(priv->irq);

		/* Read the events once to arm the IRQ */
		eeti_ts_read(&priv->work);

		return 0;
		}

		static void eeti_ts_close(struct input_dev *dev)
		{
		struct eeti_ts_priv *priv = input_get_drvdata(dev);

		disable_irq(priv->irq);
		cancel_work_sync(&priv->work);
		}

		static int __devinit eeti_ts_probe(struct i2c_client *client,
		const struct i2c_device_id *idp)
		{
		struct eeti_ts_priv *priv;
		struct input_dev *input;
		int err = -ENOMEM;

		/* In contrast to what's described in the datasheet, there seems
		* to be no way of probing the presence of that device using I2C
		* commands. So we need to blindly believe it is there, and wait
		* for interrupts to occur. */

		priv = kzalloc(sizeof(*priv), GFP_KERNEL);
		if (!priv) {
		dev_err(&client->dev, "failed to allocate driver data\n");
		goto err0;
		}

		mutex_init(&priv->mutex);
		input = input_allocate_device();

		if (!input) {
		dev_err(&client->dev, "Failed to allocate input device.\n");
		goto err1;
		}

		input->evbit[0] = BIT_MASK(EV_KEY) \| BIT_MASK(EV_ABS);
		input->keybit[BIT_WORD(BTN_TOUCH)] = BIT_MASK(BTN_TOUCH);

		input_set_abs_params(input, ABS_X, 0, EETI_MAXVAL, 0, 0);
		input_set_abs_params(input, ABS_Y, 0, EETI_MAXVAL, 0, 0);
		input_set_abs_params(input, ABS_PRESSURE, 0, 0xff, 0, 0);

		input->name = client->name;
		input->id.bustype = BUS_I2C;
		input->dev.parent = &client->dev;
		input->open = eeti_ts_open;
		input->close = eeti_ts_close;

		priv->client = client;
		priv->input = input;
		priv->irq = client->irq;

		INIT_WORK(&priv->work, eeti_ts_read);
		i2c_set_clientdata(client, priv);
		input_set_drvdata(input, priv);

		err = input_register_device(input);
		if (err)
		goto err1;

		err = request_irq(priv->irq, eeti_ts_isr, IRQF_TRIGGER_FALLING,
		client->name, priv);
		if (err) {
		dev_err(&client->dev, "Unable to request touchscreen IRQ.\n");
		goto err2;
		}

		/* Disable the irq for now. It will be enabled once the input device
		* is opened. */
		disable_irq(priv->irq);

		device_init_wakeup(&client->dev, 0);
		return 0;

		err2:
		input_unregister_device(input);
		input = NULL; /* so we dont try to free it below */
		err1:
		input_free_device(input);
		i2c_set_clientdata(client, NULL);
		kfree(priv);
		err0:
		return err;
		}

		static int __devexit eeti_ts_remove(struct i2c_client *client)
		{
		struct eeti_ts_priv *priv = i2c_get_clientdata(client);

		free_irq(priv->irq, priv);
		input_unregister_device(priv->input);
		i2c_set_clientdata(client, NULL);
		kfree(priv);

		return 0;
		}

		#ifdef CONFIG_PM
		static int eeti_ts_suspend(struct i2c_client *client, pm_message_t mesg)
		{
		struct eeti_ts_priv *priv = i2c_get_clientdata(client);

		if (device_may_wakeup(&client->dev))
		enable_irq_wake(priv->irq);

		return 0;
		}

		static int eeti_ts_resume(struct i2c_client *client)
		{
		struct eeti_ts_priv *priv = i2c_get_clientdata(client);

		if (device_may_wakeup(&client->dev))
		disable_irq_wake(priv->irq);

		return 0;
		}
		#else
		#define eeti_ts_suspend NULL
		#define eeti_ts_resume NULL
		#endif

		static const struct i2c_device_id eeti_ts_id[] = {
		{ "eeti_ts", 0 },
		{ }
		};
		MODULE_DEVICE_TABLE(i2c, eeti_ts_id);

		static struct i2c_driver eeti_ts_driver = {
		.driver = {
		.name = "eeti_ts",
		},
		.probe = eeti_ts_probe,
		.remove = __devexit_p(eeti_ts_remove),
		.suspend = eeti_ts_suspend,
		.resume = eeti_ts_resume,
		.id_table = eeti_ts_id,
		};

		static int __init eeti_ts_init(void)
		{
		return i2c_add_driver(&eeti_ts_driver);
		}

		static void __exit eeti_ts_exit(void)
		{
		i2c_del_driver(&eeti_ts_driver);
		}

		MODULE_DESCRIPTION("EETI Touchscreen driver");
		MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
		MODULE_LICENSE("GPL");

		module_init(eeti_ts_init);
		module_exit(eeti_ts_exit);