[mirror_ubuntu-bionic-kernel.git] / drivers / input / touchscreen / pixcir_i2c_ts.c

/*
 * Driver for Pixcir I2C touchscreen controllers.
 *
 * Copyright (C) 2010-2011 Pixcir, Inc.
 *
 * This software is licensed under the terms of the GNU General Public
 * License version 2, as published by the Free Software Foundation, and
 * may be copied, distributed, and modified under those terms.
 *
 * This program 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/delay.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/input.h>
#include <linux/input/pixcir_ts.h>
#include <linux/gpio.h>

struct pixcir_i2c_ts_data {
	struct i2c_client *client;
	struct input_dev *input;
	const struct pixcir_ts_platform_data *chip;
	bool running;
};

static void pixcir_ts_poscheck(struct pixcir_i2c_ts_data *data)
{
	struct pixcir_i2c_ts_data *tsdata = data;
	u8 rdbuf[10], wrbuf[1] = { 0 };
	u8 touch;
	int ret;

	ret = i2c_master_send(tsdata->client, wrbuf, sizeof(wrbuf));
	if (ret != sizeof(wrbuf)) {
		dev_err(&tsdata->client->dev,
			"%s: i2c_master_send failed(), ret=%d\n",
			__func__, ret);
		return;
	}

	ret = i2c_master_recv(tsdata->client, rdbuf, sizeof(rdbuf));
	if (ret != sizeof(rdbuf)) {
		dev_err(&tsdata->client->dev,
			"%s: i2c_master_recv failed(), ret=%d\n",
			__func__, ret);
		return;
	}

	touch = rdbuf[0];
	if (touch) {
		u16 posx1 = (rdbuf[3] << 8) | rdbuf[2];
		u16 posy1 = (rdbuf[5] << 8) | rdbuf[4];
		u16 posx2 = (rdbuf[7] << 8) | rdbuf[6];
		u16 posy2 = (rdbuf[9] << 8) | rdbuf[8];

		input_report_key(tsdata->input, BTN_TOUCH, 1);
		input_report_abs(tsdata->input, ABS_X, posx1);
		input_report_abs(tsdata->input, ABS_Y, posy1);

		input_report_abs(tsdata->input, ABS_MT_POSITION_X, posx1);
		input_report_abs(tsdata->input, ABS_MT_POSITION_Y, posy1);
		input_mt_sync(tsdata->input);

		if (touch == 2) {
			input_report_abs(tsdata->input,
					 ABS_MT_POSITION_X, posx2);
			input_report_abs(tsdata->input,
					 ABS_MT_POSITION_Y, posy2);
			input_mt_sync(tsdata->input);
		}
	} else {
		input_report_key(tsdata->input, BTN_TOUCH, 0);
	}

	input_sync(tsdata->input);
}

static irqreturn_t pixcir_ts_isr(int irq, void *dev_id)
{
	struct pixcir_i2c_ts_data *tsdata = dev_id;
	const struct pixcir_ts_platform_data *pdata = tsdata->chip;

	while (tsdata->running) {
		pixcir_ts_poscheck(tsdata);

		if (gpio_get_value(pdata->gpio_attb))
			break;

		msleep(20);
	}

	return IRQ_HANDLED;
}

static int pixcir_set_power_mode(struct pixcir_i2c_ts_data *ts,
				 enum pixcir_power_mode mode)
{
	struct device *dev = &ts->client->dev;
	int ret;

	ret = i2c_smbus_read_byte_data(ts->client, PIXCIR_REG_POWER_MODE);
	if (ret < 0) {
		dev_err(dev, "%s: can't read reg 0x%x : %d\n",
			__func__, PIXCIR_REG_POWER_MODE, ret);
		return ret;
	}

	ret &= ~PIXCIR_POWER_MODE_MASK;
	ret |= mode;

	/* Always AUTO_IDLE */
	ret |= PIXCIR_POWER_ALLOW_IDLE;

	ret = i2c_smbus_write_byte_data(ts->client, PIXCIR_REG_POWER_MODE, ret);
	if (ret < 0) {
		dev_err(dev, "%s: can't write reg 0x%x : %d\n",
			__func__, PIXCIR_REG_POWER_MODE, ret);
		return ret;
	}

	return 0;
}

/*
 * Set the interrupt mode for the device i.e. ATTB line behaviour
 *
 * @polarity : 1 for active high, 0 for active low.
 */
static int pixcir_set_int_mode(struct pixcir_i2c_ts_data *ts,
			       enum pixcir_int_mode mode, bool polarity)
{
	struct device *dev = &ts->client->dev;
	int ret;

	ret = i2c_smbus_read_byte_data(ts->client, PIXCIR_REG_INT_MODE);
	if (ret < 0) {
		dev_err(dev, "%s: can't read reg 0x%x : %d\n",
			__func__, PIXCIR_REG_INT_MODE, ret);
		return ret;
	}

	ret &= ~PIXCIR_INT_MODE_MASK;
	ret |= mode;

	if (polarity)
		ret |= PIXCIR_INT_POL_HIGH;
	else
		ret &= ~PIXCIR_INT_POL_HIGH;

	ret = i2c_smbus_write_byte_data(ts->client, PIXCIR_REG_INT_MODE, ret);
	if (ret < 0) {
		dev_err(dev, "%s: can't write reg 0x%x : %d\n",
			__func__, PIXCIR_REG_INT_MODE, ret);
		return ret;
	}

	return 0;
}

/*
 * Enable/disable interrupt generation
 */
static int pixcir_int_enable(struct pixcir_i2c_ts_data *ts, bool enable)
{
	struct device *dev = &ts->client->dev;
	int ret;

	ret = i2c_smbus_read_byte_data(ts->client, PIXCIR_REG_INT_MODE);
	if (ret < 0) {
		dev_err(dev, "%s: can't read reg 0x%x : %d\n",
			__func__, PIXCIR_REG_INT_MODE, ret);
		return ret;
	}

	if (enable)
		ret |= PIXCIR_INT_ENABLE;
	else
		ret &= ~PIXCIR_INT_ENABLE;

	ret = i2c_smbus_write_byte_data(ts->client, PIXCIR_REG_INT_MODE, ret);
	if (ret < 0) {
		dev_err(dev, "%s: can't write reg 0x%x : %d\n",
			__func__, PIXCIR_REG_INT_MODE, ret);
		return ret;
	}

	return 0;
}

static int pixcir_start(struct pixcir_i2c_ts_data *ts)
{
	struct device *dev = &ts->client->dev;
	int error;

	/* LEVEL_TOUCH interrupt with active low polarity */
	error = pixcir_set_int_mode(ts, PIXCIR_INT_LEVEL_TOUCH, 0);
	if (error) {
		dev_err(dev, "Failed to set interrupt mode: %d\n", error);
		return error;
	}

	ts->running = true;
	mb();	/* Update status before IRQ can fire */

	/* enable interrupt generation */
	error = pixcir_int_enable(ts, true);
	if (error) {
		dev_err(dev, "Failed to enable interrupt generation: %d\n",
			error);
		return error;
	}

	return 0;
}

static int pixcir_stop(struct pixcir_i2c_ts_data *ts)
{
	int error;

	/* Disable interrupt generation */
	error = pixcir_int_enable(ts, false);
	if (error) {
		dev_err(&ts->client->dev,
			"Failed to disable interrupt generation: %d\n",
			error);
		return error;
	}

	/* Exit ISR if running, no more report parsing */
	ts->running = false;
	mb();	/* update status before we synchronize irq */

	/* Wait till running ISR is complete */
	synchronize_irq(ts->client->irq);

	return 0;
}

static int pixcir_input_open(struct input_dev *dev)
{
	struct pixcir_i2c_ts_data *ts = input_get_drvdata(dev);

	return pixcir_start(ts);
}

static void pixcir_input_close(struct input_dev *dev)
{
	struct pixcir_i2c_ts_data *ts = input_get_drvdata(dev);

	pixcir_stop(ts);
}

#ifdef CONFIG_PM_SLEEP
static int pixcir_i2c_ts_suspend(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct pixcir_i2c_ts_data *ts = i2c_get_clientdata(client);
	struct input_dev *input = ts->input;
	int ret = 0;

	mutex_lock(&input->mutex);

	if (device_may_wakeup(&client->dev)) {
		if (!input->users) {
			ret = pixcir_start(ts);
			if (ret) {
				dev_err(dev, "Failed to start\n");
				goto unlock;
			}
		}

		enable_irq_wake(client->irq);
	} else if (input->users) {
		ret = pixcir_stop(ts);
	}

unlock:
	mutex_unlock(&input->mutex);

	return ret;
}

static int pixcir_i2c_ts_resume(struct device *dev)
{
	struct i2c_client *client = to_i2c_client(dev);
	struct pixcir_i2c_ts_data *ts = i2c_get_clientdata(client);
	struct input_dev *input = ts->input;
	int ret = 0;

	mutex_lock(&input->mutex);

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

		if (!input->users) {
			ret = pixcir_stop(ts);
			if (ret) {
				dev_err(dev, "Failed to stop\n");
				goto unlock;
			}
		}
	} else if (input->users) {
		ret = pixcir_start(ts);
	}

unlock:
	mutex_unlock(&input->mutex);

	return ret;
}
#endif

static SIMPLE_DEV_PM_OPS(pixcir_dev_pm_ops,
			 pixcir_i2c_ts_suspend, pixcir_i2c_ts_resume);

static int pixcir_i2c_ts_probe(struct i2c_client *client,
					 const struct i2c_device_id *id)
{
	const struct pixcir_ts_platform_data *pdata =
			dev_get_platdata(&client->dev);
	struct device *dev = &client->dev;
	struct pixcir_i2c_ts_data *tsdata;
	struct input_dev *input;
	int error;

	if (!pdata) {
		dev_err(&client->dev, "platform data not defined\n");
		return -EINVAL;
	}

	if (!gpio_is_valid(pdata->gpio_attb)) {
		dev_err(dev, "Invalid gpio_attb in pdata\n");
		return -EINVAL;
	}

	tsdata = devm_kzalloc(dev, sizeof(*tsdata), GFP_KERNEL);
	if (!tsdata)
		return -ENOMEM;

	input = devm_input_allocate_device(dev);
	if (!input) {
		dev_err(dev, "Failed to allocate input device\n");
		return -ENOMEM;
	}

	tsdata->client = client;
	tsdata->input = input;
	tsdata->chip = pdata;

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

	__set_bit(EV_KEY, input->evbit);
	__set_bit(EV_ABS, input->evbit);
	__set_bit(BTN_TOUCH, input->keybit);
	input_set_abs_params(input, ABS_X, 0, pdata->x_max, 0, 0);
	input_set_abs_params(input, ABS_Y, 0, pdata->y_max, 0, 0);
	input_set_abs_params(input, ABS_MT_POSITION_X, 0, pdata->x_max, 0, 0);
	input_set_abs_params(input, ABS_MT_POSITION_Y, 0, pdata->y_max, 0, 0);

	input_set_drvdata(input, tsdata);

	error = devm_gpio_request_one(dev, pdata->gpio_attb,
				      GPIOF_DIR_IN, "pixcir_i2c_attb");
	if (error) {
		dev_err(dev, "Failed to request ATTB gpio\n");
		return error;
	}

	error = devm_request_threaded_irq(dev, client->irq, NULL, pixcir_ts_isr,
					  IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
					  client->name, tsdata);
	if (error) {
		dev_err(dev, "failed to request irq %d\n", client->irq);
		return error;
	}

	/* Always be in IDLE mode to save power, device supports auto wake */
	error = pixcir_set_power_mode(tsdata, PIXCIR_POWER_IDLE);
	if (error) {
		dev_err(dev, "Failed to set IDLE mode\n");
		return error;
	}

	/* Stop device till opened */
	error = pixcir_stop(tsdata);
	if (error)
		return error;

	error = input_register_device(input);
	if (error)
		return error;

	i2c_set_clientdata(client, tsdata);
	device_init_wakeup(&client->dev, 1);

	return 0;
}

static int pixcir_i2c_ts_remove(struct i2c_client *client)
{
	device_init_wakeup(&client->dev, 0);

	return 0;
}

static const struct i2c_device_id pixcir_i2c_ts_id[] = {
	{ "pixcir_ts", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, pixcir_i2c_ts_id);

static struct i2c_driver pixcir_i2c_ts_driver = {
	.driver = {
		.owner	= THIS_MODULE,
		.name	= "pixcir_ts",
		.pm	= &pixcir_dev_pm_ops,
	},
	.probe		= pixcir_i2c_ts_probe,
	.remove		= pixcir_i2c_ts_remove,
	.id_table	= pixcir_i2c_ts_id,
};

module_i2c_driver(pixcir_i2c_ts_driver);

MODULE_AUTHOR("Jianchun Bian <jcbian@pixcir.com.cn>, Dequan Meng <dqmeng@pixcir.com.cn>");
MODULE_DESCRIPTION("Pixcir I2C Touchscreen Driver");
MODULE_LICENSE("GPL");
Commit	Line	Data
36a281e2 JB	1	/*
	2	* Driver for Pixcir I2C touchscreen controllers.
	3	*
	4	* Copyright (C) 2010-2011 Pixcir, Inc.
	5	*
	6	* This software is licensed under the terms of the GNU General Public
	7	* License version 2, as published by the Free Software Foundation, and
	8	* may be copied, distributed, and modified under those terms.
	9	*
	10	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License for more details.
	14	*
	15	* You should have received a copy of the GNU General Public
	16	* License along with this library; if not, write to the Free Software
	17	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	18	*/
	19
	20	#include <linux/delay.h>
	21	#include <linux/module.h>
	22	#include <linux/interrupt.h>
	23	#include <linux/slab.h>
	24	#include <linux/i2c.h>
	25	#include <linux/input.h>
	26	#include <linux/input/pixcir_ts.h>
0dfc8d41	27	#include <linux/gpio.h>
36a281e2 JB	28
	29	struct pixcir_i2c_ts_data {
	30	struct i2c_client *client;
	31	struct input_dev *input;
	32	const struct pixcir_ts_platform_data *chip;
3b36fbb0	33	bool running;
36a281e2 JB	34	};
	35
	36	static void pixcir_ts_poscheck(struct pixcir_i2c_ts_data *data)
	37	{
	38	struct pixcir_i2c_ts_data *tsdata = data;
	39	u8 rdbuf[10], wrbuf[1] = { 0 };
	40	u8 touch;
	41	int ret;
	42
	43	ret = i2c_master_send(tsdata->client, wrbuf, sizeof(wrbuf));
	44	if (ret != sizeof(wrbuf)) {
	45	dev_err(&tsdata->client->dev,
	46	"%s: i2c_master_send failed(), ret=%d\n",
	47	__func__, ret);
	48	return;
	49	}
	50
	51	ret = i2c_master_recv(tsdata->client, rdbuf, sizeof(rdbuf));
	52	if (ret != sizeof(rdbuf)) {
	53	dev_err(&tsdata->client->dev,
	54	"%s: i2c_master_recv failed(), ret=%d\n",
	55	__func__, ret);
	56	return;
	57	}
	58
	59	touch = rdbuf[0];
	60	if (touch) {
	61	u16 posx1 = (rdbuf[3] << 8) \| rdbuf[2];
	62	u16 posy1 = (rdbuf[5] << 8) \| rdbuf[4];
	63	u16 posx2 = (rdbuf[7] << 8) \| rdbuf[6];
	64	u16 posy2 = (rdbuf[9] << 8) \| rdbuf[8];
	65
	66	input_report_key(tsdata->input, BTN_TOUCH, 1);
	67	input_report_abs(tsdata->input, ABS_X, posx1);
	68	input_report_abs(tsdata->input, ABS_Y, posy1);
	69
	70	input_report_abs(tsdata->input, ABS_MT_POSITION_X, posx1);
	71	input_report_abs(tsdata->input, ABS_MT_POSITION_Y, posy1);
	72	input_mt_sync(tsdata->input);
	73
	74	if (touch == 2) {
	75	input_report_abs(tsdata->input,
	76	ABS_MT_POSITION_X, posx2);
	77	input_report_abs(tsdata->input,
	78	ABS_MT_POSITION_Y, posy2);
	79	input_mt_sync(tsdata->input);
	80	}
	81	} else {
	82	input_report_key(tsdata->input, BTN_TOUCH, 0);
	83	}
	84
	85	input_sync(tsdata->input);
	86	}
	87
	88	static irqreturn_t pixcir_ts_isr(int irq, void *dev_id)
	89	{
	90	struct pixcir_i2c_ts_data *tsdata = dev_id;
0dfc8d41	91	const struct pixcir_ts_platform_data *pdata = tsdata->chip;
36a281e2	92
3b36fbb0	93	while (tsdata->running) {
36a281e2 JB	94	pixcir_ts_poscheck(tsdata);
36a281e2 JB	95
0dfc8d41	96	if (gpio_get_value(pdata->gpio_attb))
36a281e2 JB	97	break;
	98
	99	msleep(20);
	100	}
	101
	102	return IRQ_HANDLED;
	103	}
	104
3b36fbb0 RQ	105	static int pixcir_set_power_mode(struct pixcir_i2c_ts_data *ts,
	106	enum pixcir_power_mode mode)
	107	{
	108	struct device *dev = &ts->client->dev;
	109	int ret;
	110
	111	ret = i2c_smbus_read_byte_data(ts->client, PIXCIR_REG_POWER_MODE);
	112	if (ret < 0) {
	113	dev_err(dev, "%s: can't read reg 0x%x : %d\n",
	114	__func__, PIXCIR_REG_POWER_MODE, ret);
	115	return ret;
	116	}
	117
	118	ret &= ~PIXCIR_POWER_MODE_MASK;
	119	ret \|= mode;
	120
	121	/* Always AUTO_IDLE */
	122	ret \|= PIXCIR_POWER_ALLOW_IDLE;
	123
	124	ret = i2c_smbus_write_byte_data(ts->client, PIXCIR_REG_POWER_MODE, ret);
	125	if (ret < 0) {
	126	dev_err(dev, "%s: can't write reg 0x%x : %d\n",
	127	__func__, PIXCIR_REG_POWER_MODE, ret);
	128	return ret;
	129	}
	130
	131	return 0;
	132	}
	133
	134	/*
	135	* Set the interrupt mode for the device i.e. ATTB line behaviour
	136	*
	137	* @polarity : 1 for active high, 0 for active low.
	138	*/
	139	static int pixcir_set_int_mode(struct pixcir_i2c_ts_data *ts,
	140	enum pixcir_int_mode mode, bool polarity)
	141	{
	142	struct device *dev = &ts->client->dev;
	143	int ret;
	144
	145	ret = i2c_smbus_read_byte_data(ts->client, PIXCIR_REG_INT_MODE);
	146	if (ret < 0) {
	147	dev_err(dev, "%s: can't read reg 0x%x : %d\n",
	148	__func__, PIXCIR_REG_INT_MODE, ret);
	149	return ret;
	150	}
	151
	152	ret &= ~PIXCIR_INT_MODE_MASK;
	153	ret \|= mode;
	154
	155	if (polarity)
	156	ret \|= PIXCIR_INT_POL_HIGH;
	157	else
	158	ret &= ~PIXCIR_INT_POL_HIGH;
	159
	160	ret = i2c_smbus_write_byte_data(ts->client, PIXCIR_REG_INT_MODE, ret);
	161	if (ret < 0) {
	162	dev_err(dev, "%s: can't write reg 0x%x : %d\n",
	163	__func__, PIXCIR_REG_INT_MODE, ret);
	164	return ret;
	165	}
	166
	167	return 0;
	168	}
169
170	/*
171	* Enable/disable interrupt generation
172	*/
173	static int pixcir_int_enable(struct pixcir_i2c_ts_data *ts, bool enable)
174	{
175	struct device *dev = &ts->client->dev;
176	int ret;
177
178	ret = i2c_smbus_read_byte_data(ts->client, PIXCIR_REG_INT_MODE);
179	if (ret < 0) {
180	dev_err(dev, "%s: can't read reg 0x%x : %d\n",
181	__func__, PIXCIR_REG_INT_MODE, ret);
182	return ret;
183	}
184
185	if (enable)
186	ret \|= PIXCIR_INT_ENABLE;
187	else
188	ret &= ~PIXCIR_INT_ENABLE;
189
190	ret = i2c_smbus_write_byte_data(ts->client, PIXCIR_REG_INT_MODE, ret);
191	if (ret < 0) {
192	dev_err(dev, "%s: can't write reg 0x%x : %d\n",
193	__func__, PIXCIR_REG_INT_MODE, ret);
194	return ret;
195	}
196
197	return 0;
198	}
199
200	static int pixcir_start(struct pixcir_i2c_ts_data *ts)
201	{
202	struct device *dev = &ts->client->dev;
203	int error;
204
205	/* LEVEL_TOUCH interrupt with active low polarity */
206	error = pixcir_set_int_mode(ts, PIXCIR_INT_LEVEL_TOUCH, 0);
207	if (error) {
208	dev_err(dev, "Failed to set interrupt mode: %d\n", error);
209	return error;
210	}
211
212	ts->running = true;
213	mb(); /* Update status before IRQ can fire */
214
215	/* enable interrupt generation */
216	error = pixcir_int_enable(ts, true);
217	if (error) {
218	dev_err(dev, "Failed to enable interrupt generation: %d\n",
219	error);
220	return error;
221	}
222
223	return 0;
224	}
225
226	static int pixcir_stop(struct pixcir_i2c_ts_data *ts)
227	{
228	int error;
229
230	/* Disable interrupt generation */
231	error = pixcir_int_enable(ts, false);
232	if (error) {
233	dev_err(&ts->client->dev,
234	"Failed to disable interrupt generation: %d\n",
235	error);
236	return error;
237	}
238
239	/* Exit ISR if running, no more report parsing */
240	ts->running = false;
241	mb(); /* update status before we synchronize irq */
242
243	/* Wait till running ISR is complete */
244	synchronize_irq(ts->client->irq);
245
246	return 0;
247	}
248
249	static int pixcir_input_open(struct input_dev *dev)
250	{
251	struct pixcir_i2c_ts_data *ts = input_get_drvdata(dev);
252
253	return pixcir_start(ts);
254	}
255
256	static void pixcir_input_close(struct input_dev *dev)
257	{
258	struct pixcir_i2c_ts_data *ts = input_get_drvdata(dev);
259
260	pixcir_stop(ts);
261	}
262
36a281e2 JB	263	#ifdef CONFIG_PM_SLEEP
	264	static int pixcir_i2c_ts_suspend(struct device *dev)
	265	{
	266	struct i2c_client *client = to_i2c_client(dev);
7cdcb8d1 RQ	267	struct pixcir_i2c_ts_data *ts = i2c_get_clientdata(client);
	268	struct input_dev *input = ts->input;
	269	int ret = 0;
	270
	271	mutex_lock(&input->mutex);
	272
	273	if (device_may_wakeup(&client->dev)) {
	274	if (!input->users) {
	275	ret = pixcir_start(ts);
	276	if (ret) {
	277	dev_err(dev, "Failed to start\n");
	278	goto unlock;
	279	}
	280	}
36a281e2	281
36a281e2	282	enable_irq_wake(client->irq);
7cdcb8d1 RQ	283	} else if (input->users) {
	284	ret = pixcir_stop(ts);
	285	}
36a281e2	286
7cdcb8d1 RQ	287	unlock:
	288	mutex_unlock(&input->mutex);
	289
	290	return ret;
36a281e2 JB	291	}
	292
	293	static int pixcir_i2c_ts_resume(struct device *dev)
	294	{
	295	struct i2c_client *client = to_i2c_client(dev);
7cdcb8d1 RQ	296	struct pixcir_i2c_ts_data *ts = i2c_get_clientdata(client);
	297	struct input_dev *input = ts->input;
	298	int ret = 0;
	299
	300	mutex_lock(&input->mutex);
36a281e2	301
7cdcb8d1	302	if (device_may_wakeup(&client->dev)) {
36a281e2 JB	303	disable_irq_wake(client->irq);
36a281e2 JB	304
7cdcb8d1 RQ	305	if (!input->users) {
	306	ret = pixcir_stop(ts);
	307	if (ret) {
	308	dev_err(dev, "Failed to stop\n");
	309	goto unlock;
	310	}
	311	}
	312	} else if (input->users) {
	313	ret = pixcir_start(ts);
	314	}
	315
	316	unlock:
	317	mutex_unlock(&input->mutex);
	318
	319	return ret;
36a281e2 JB	320	}
	321	#endif
	322
	323	static SIMPLE_DEV_PM_OPS(pixcir_dev_pm_ops,
	324	pixcir_i2c_ts_suspend, pixcir_i2c_ts_resume);
	325
5298cc4c	326	static int pixcir_i2c_ts_probe(struct i2c_client *client,
36a281e2 JB	327	const struct i2c_device_id *id)
36a281e2 JB	328	{
c838cb3d JH	329	const struct pixcir_ts_platform_data *pdata =
c838cb3d JH	330	dev_get_platdata(&client->dev);
e9d4718d	331	struct device *dev = &client->dev;
36a281e2 JB	332	struct pixcir_i2c_ts_data *tsdata;
	333	struct input_dev *input;
	334	int error;
	335
	336	if (!pdata) {
	337	dev_err(&client->dev, "platform data not defined\n");
	338	return -EINVAL;
	339	}
	340
0dfc8d41 RQ	341	if (!gpio_is_valid(pdata->gpio_attb)) {
	342	dev_err(dev, "Invalid gpio_attb in pdata\n");
	343	return -EINVAL;
	344	}
	345
e9d4718d RQ	346	tsdata = devm_kzalloc(dev, sizeof(*tsdata), GFP_KERNEL);
	347	if (!tsdata)
	348	return -ENOMEM;
	349
	350	input = devm_input_allocate_device(dev);
	351	if (!input) {
	352	dev_err(dev, "Failed to allocate input device\n");
	353	return -ENOMEM;
36a281e2 JB	354	}
	355
	356	tsdata->client = client;
	357	tsdata->input = input;
	358	tsdata->chip = pdata;
	359
	360	input->name = client->name;
	361	input->id.bustype = BUS_I2C;
3b36fbb0 RQ	362	input->open = pixcir_input_open;
3b36fbb0 RQ	363	input->close = pixcir_input_close;
36a281e2 JB	364	input->dev.parent = &client->dev;
	365
	366	__set_bit(EV_KEY, input->evbit);
	367	__set_bit(EV_ABS, input->evbit);
	368	__set_bit(BTN_TOUCH, input->keybit);
	369	input_set_abs_params(input, ABS_X, 0, pdata->x_max, 0, 0);
	370	input_set_abs_params(input, ABS_Y, 0, pdata->y_max, 0, 0);
	371	input_set_abs_params(input, ABS_MT_POSITION_X, 0, pdata->x_max, 0, 0);
	372	input_set_abs_params(input, ABS_MT_POSITION_Y, 0, pdata->y_max, 0, 0);
	373
	374	input_set_drvdata(input, tsdata);
	375
0dfc8d41 RQ	376	error = devm_gpio_request_one(dev, pdata->gpio_attb,
	377	GPIOF_DIR_IN, "pixcir_i2c_attb");
	378	if (error) {
	379	dev_err(dev, "Failed to request ATTB gpio\n");
	380	return error;
	381	}
	382
e9d4718d RQ	383	error = devm_request_threaded_irq(dev, client->irq, NULL, pixcir_ts_isr,
	384	IRQF_TRIGGER_FALLING \| IRQF_ONESHOT,
	385	client->name, tsdata);
36a281e2	386	if (error) {
e9d4718d RQ	387	dev_err(dev, "failed to request irq %d\n", client->irq);
e9d4718d RQ	388	return error;
36a281e2 JB	389	}
36a281e2 JB	390
3b36fbb0 RQ	391	/* Always be in IDLE mode to save power, device supports auto wake */
	392	error = pixcir_set_power_mode(tsdata, PIXCIR_POWER_IDLE);
	393	if (error) {
	394	dev_err(dev, "Failed to set IDLE mode\n");
	395	return error;
	396	}
	397
	398	/* Stop device till opened */
	399	error = pixcir_stop(tsdata);
	400	if (error)
	401	return error;
	402
36a281e2 JB	403	error = input_register_device(input);
36a281e2 JB	404	if (error)
e9d4718d	405	return error;
36a281e2	406
7cdcb8d1	407	i2c_set_clientdata(client, tsdata);
36a281e2 JB	408	device_init_wakeup(&client->dev, 1);
	409
	410	return 0;
36a281e2 JB	411	}
36a281e2 JB	412
e2619cf7	413	static int pixcir_i2c_ts_remove(struct i2c_client *client)
36a281e2	414	{
36a281e2 JB	415	device_init_wakeup(&client->dev, 0);
36a281e2 JB	416
36a281e2 JB	417	return 0;
	418	}
	419
	420	static const struct i2c_device_id pixcir_i2c_ts_id[] = {
	421	{ "pixcir_ts", 0 },
	422	{ }
	423	};
	424	MODULE_DEVICE_TABLE(i2c, pixcir_i2c_ts_id);
	425
	426	static struct i2c_driver pixcir_i2c_ts_driver = {
	427	.driver = {
	428	.owner = THIS_MODULE,
	429	.name = "pixcir_ts",
	430	.pm = &pixcir_dev_pm_ops,
	431	},
	432	.probe = pixcir_i2c_ts_probe,
1cb0aa88	433	.remove = pixcir_i2c_ts_remove,
36a281e2 JB	434	.id_table = pixcir_i2c_ts_id,
	435	};
	436
4a533835	437	module_i2c_driver(pixcir_i2c_ts_driver);
36a281e2 JB	438
	439	MODULE_AUTHOR("Jianchun Bian <jcbian@pixcir.com.cn>, Dequan Meng <dqmeng@pixcir.com.cn>");
	440	MODULE_DESCRIPTION("Pixcir I2C Touchscreen Driver");
	441	MODULE_LICENSE("GPL");