[mirror_ubuntu-artful-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/mt.h>
#include <linux/input/pixcir_ts.h>
#include <linux/gpio.h>

#define PIXCIR_MAX_SLOTS       2

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

struct pixcir_touch {
	int x;
	int y;
};

struct pixcir_report_data {
	int num_touches;
	struct pixcir_touch touches[PIXCIR_MAX_SLOTS];
};

static void pixcir_ts_parse(struct pixcir_i2c_ts_data *tsdata,
			    struct pixcir_report_data *report)
{
	u8 rdbuf[10], wrbuf[1] = { 0 };
	u8 *bufptr;
	u8 touch;
	int ret, i;

	memset(report, 0, sizeof(struct pixcir_report_data));

	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] & 0x7;
	if (touch > PIXCIR_MAX_SLOTS)
		touch = PIXCIR_MAX_SLOTS;

	report->num_touches = touch;
	bufptr = &rdbuf[2];

	for (i = 0; i < touch; i++) {
		report->touches[i].x = (bufptr[1] << 8) | bufptr[0];
		report->touches[i].y = (bufptr[3] << 8) | bufptr[2];

		bufptr = bufptr + 4;
	}
}

static void pixcir_ts_report(struct pixcir_i2c_ts_data *ts,
			     struct pixcir_report_data *report)
{
	struct input_mt_pos pos[PIXCIR_MAX_SLOTS];
	int slots[PIXCIR_MAX_SLOTS];
	struct pixcir_touch *touch;
	int n, i, slot;
	struct device *dev = &ts->client->dev;

	n = report->num_touches;
	if (n > PIXCIR_MAX_SLOTS)
		n = PIXCIR_MAX_SLOTS;

	for (i = 0; i < n; i++) {
		touch = &report->touches[i];
		pos[i].x = touch->x;
		pos[i].y = touch->y;
	}

	input_mt_assign_slots(ts->input, slots, pos, n);

	for (i = 0; i < n; i++) {
		touch = &report->touches[i];
		slot = slots[i];

		input_mt_slot(ts->input, slot);
		input_mt_report_slot_state(ts->input,
					   MT_TOOL_FINGER, true);

		input_event(ts->input, EV_ABS, ABS_MT_POSITION_X, touch->x);
		input_event(ts->input, EV_ABS, ABS_MT_POSITION_Y, touch->y);

		dev_dbg(dev, "%d: slot %d, x %d, y %d\n",
			i, slot, touch->x, touch->y);
	}

	input_mt_sync_frame(ts->input);
	input_sync(ts->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;
	struct pixcir_report_data report;

	while (tsdata->running) {
		/* parse packet */
		pixcir_ts_parse(tsdata, &report);

		/* report it */
		pixcir_ts_report(tsdata, &report);

		if (gpio_get_value(pdata->gpio_attb)) {
			if (report.num_touches) {
				/*
				 * Last report with no finger up?
				 * Do it now then.
				 */
				input_mt_sync_frame(tsdata->input);
				input_sync(tsdata->input);
			}
			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);

	error = input_mt_init_slots(input, PIXCIR_MAX_SLOTS,
				    INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
	if (error) {
		dev_err(dev, "Error initializing Multi-Touch slots\n");
		return error;
	}

	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>
62e65b7e	26	#include <linux/input/mt.h>
36a281e2	27	#include <linux/input/pixcir_ts.h>
0dfc8d41	28	#include <linux/gpio.h>
36a281e2	29
62e65b7e RQ	30	#define PIXCIR_MAX_SLOTS 2
62e65b7e RQ	31
36a281e2 JB	32	struct pixcir_i2c_ts_data {
	33	struct i2c_client *client;
	34	struct input_dev *input;
	35	const struct pixcir_ts_platform_data *chip;
3b36fbb0	36	bool running;
36a281e2 JB	37	};
36a281e2 JB	38
62e65b7e RQ	39	struct pixcir_touch {
	40	int x;
	41	int y;
	42	};
	43
	44	struct pixcir_report_data {
	45	int num_touches;
	46	struct pixcir_touch touches[PIXCIR_MAX_SLOTS];
	47	};
	48
	49	static void pixcir_ts_parse(struct pixcir_i2c_ts_data *tsdata,
	50	struct pixcir_report_data *report)
36a281e2	51	{
36a281e2	52	u8 rdbuf[10], wrbuf[1] = { 0 };
62e65b7e	53	u8 *bufptr;
36a281e2	54	u8 touch;
62e65b7e RQ	55	int ret, i;
	56
	57	memset(report, 0, sizeof(struct pixcir_report_data));
36a281e2 JB	58
	59	ret = i2c_master_send(tsdata->client, wrbuf, sizeof(wrbuf));
	60	if (ret != sizeof(wrbuf)) {
	61	dev_err(&tsdata->client->dev,
	62	"%s: i2c_master_send failed(), ret=%d\n",
	63	__func__, ret);
	64	return;
	65	}
	66
	67	ret = i2c_master_recv(tsdata->client, rdbuf, sizeof(rdbuf));
	68	if (ret != sizeof(rdbuf)) {
	69	dev_err(&tsdata->client->dev,
	70	"%s: i2c_master_recv failed(), ret=%d\n",
	71	__func__, ret);
	72	return;
	73	}
	74
62e65b7e RQ	75	touch = rdbuf[0] & 0x7;
	76	if (touch > PIXCIR_MAX_SLOTS)
	77	touch = PIXCIR_MAX_SLOTS;
	78
	79	report->num_touches = touch;
	80	bufptr = &rdbuf[2];
	81
	82	for (i = 0; i < touch; i++) {
	83	report->touches[i].x = (bufptr[1] << 8) \| bufptr[0];
	84	report->touches[i].y = (bufptr[3] << 8) \| bufptr[2];
	85
	86	bufptr = bufptr + 4;
36a281e2	87	}
62e65b7e RQ	88	}
	89
	90	static void pixcir_ts_report(struct pixcir_i2c_ts_data *ts,
	91	struct pixcir_report_data *report)
	92	{
	93	struct input_mt_pos pos[PIXCIR_MAX_SLOTS];
	94	int slots[PIXCIR_MAX_SLOTS];
	95	struct pixcir_touch *touch;
	96	int n, i, slot;
	97	struct device *dev = &ts->client->dev;
	98
	99	n = report->num_touches;
	100	if (n > PIXCIR_MAX_SLOTS)
	101	n = PIXCIR_MAX_SLOTS;
36a281e2	102
62e65b7e RQ	103	for (i = 0; i < n; i++) {
	104	touch = &report->touches[i];
	105	pos[i].x = touch->x;
	106	pos[i].y = touch->y;
	107	}
	108
	109	input_mt_assign_slots(ts->input, slots, pos, n);
	110
	111	for (i = 0; i < n; i++) {
	112	touch = &report->touches[i];
	113	slot = slots[i];
	114
	115	input_mt_slot(ts->input, slot);
	116	input_mt_report_slot_state(ts->input,
	117	MT_TOOL_FINGER, true);
	118
	119	input_event(ts->input, EV_ABS, ABS_MT_POSITION_X, touch->x);
	120	input_event(ts->input, EV_ABS, ABS_MT_POSITION_Y, touch->y);
	121
	122	dev_dbg(dev, "%d: slot %d, x %d, y %d\n",
	123	i, slot, touch->x, touch->y);
	124	}
	125
	126	input_mt_sync_frame(ts->input);
	127	input_sync(ts->input);
36a281e2 JB	128	}
	129
	130	static irqreturn_t pixcir_ts_isr(int irq, void *dev_id)
	131	{
	132	struct pixcir_i2c_ts_data *tsdata = dev_id;
0dfc8d41	133	const struct pixcir_ts_platform_data *pdata = tsdata->chip;
62e65b7e	134	struct pixcir_report_data report;
36a281e2	135
3b36fbb0	136	while (tsdata->running) {
62e65b7e RQ	137	/* parse packet */
	138	pixcir_ts_parse(tsdata, &report);
	139
	140	/* report it */
	141	pixcir_ts_report(tsdata, &report);
	142
	143	if (gpio_get_value(pdata->gpio_attb)) {
	144	if (report.num_touches) {
	145	/*
	146	* Last report with no finger up?
	147	* Do it now then.
	148	*/
	149	input_mt_sync_frame(tsdata->input);
	150	input_sync(tsdata->input);
	151	}
36a281e2	152	break;
62e65b7e	153	}
36a281e2 JB	154
	155	msleep(20);
	156	}
	157
	158	return IRQ_HANDLED;
	159	}
	160
3b36fbb0 RQ	161	static int pixcir_set_power_mode(struct pixcir_i2c_ts_data *ts,
	162	enum pixcir_power_mode mode)
	163	{
	164	struct device *dev = &ts->client->dev;
	165	int ret;
	166
	167	ret = i2c_smbus_read_byte_data(ts->client, PIXCIR_REG_POWER_MODE);
	168	if (ret < 0) {
	169	dev_err(dev, "%s: can't read reg 0x%x : %d\n",
	170	__func__, PIXCIR_REG_POWER_MODE, ret);
	171	return ret;
	172	}
	173
	174	ret &= ~PIXCIR_POWER_MODE_MASK;
	175	ret \|= mode;
	176
	177	/* Always AUTO_IDLE */
	178	ret \|= PIXCIR_POWER_ALLOW_IDLE;
	179
	180	ret = i2c_smbus_write_byte_data(ts->client, PIXCIR_REG_POWER_MODE, ret);
	181	if (ret < 0) {
	182	dev_err(dev, "%s: can't write reg 0x%x : %d\n",
	183	__func__, PIXCIR_REG_POWER_MODE, ret);
	184	return ret;
	185	}
	186
	187	return 0;
	188	}
	189
	190	/*
	191	* Set the interrupt mode for the device i.e. ATTB line behaviour
	192	*
	193	* @polarity : 1 for active high, 0 for active low.
	194	*/
	195	static int pixcir_set_int_mode(struct pixcir_i2c_ts_data *ts,
	196	enum pixcir_int_mode mode, bool polarity)
	197	{
	198	struct device *dev = &ts->client->dev;
	199	int ret;
	200
	201	ret = i2c_smbus_read_byte_data(ts->client, PIXCIR_REG_INT_MODE);
	202	if (ret < 0) {
	203	dev_err(dev, "%s: can't read reg 0x%x : %d\n",
	204	__func__, PIXCIR_REG_INT_MODE, ret);
	205	return ret;
	206	}
	207
	208	ret &= ~PIXCIR_INT_MODE_MASK;
	209	ret \|= mode;
	210
	211	if (polarity)
	212	ret \|= PIXCIR_INT_POL_HIGH;
	213	else
	214	ret &= ~PIXCIR_INT_POL_HIGH;
	215
	216	ret = i2c_smbus_write_byte_data(ts->client, PIXCIR_REG_INT_MODE, ret);
	217	if (ret < 0) {
	218	dev_err(dev, "%s: can't write reg 0x%x : %d\n",
	219	__func__, PIXCIR_REG_INT_MODE, ret);
	220	return ret;
	221	}
	222
	223	return 0;
	224	}
225
226	/*
227	* Enable/disable interrupt generation
228	*/
229	static int pixcir_int_enable(struct pixcir_i2c_ts_data *ts, bool enable)
230	{
231	struct device *dev = &ts->client->dev;
232	int ret;
233
234	ret = i2c_smbus_read_byte_data(ts->client, PIXCIR_REG_INT_MODE);
235	if (ret < 0) {
236	dev_err(dev, "%s: can't read reg 0x%x : %d\n",
237	__func__, PIXCIR_REG_INT_MODE, ret);
238	return ret;
239	}
240
241	if (enable)
242	ret \|= PIXCIR_INT_ENABLE;
243	else
244	ret &= ~PIXCIR_INT_ENABLE;
245
246	ret = i2c_smbus_write_byte_data(ts->client, PIXCIR_REG_INT_MODE, ret);
247	if (ret < 0) {
248	dev_err(dev, "%s: can't write reg 0x%x : %d\n",
249	__func__, PIXCIR_REG_INT_MODE, ret);
250	return ret;
251	}
252
253	return 0;
254	}
255
256	static int pixcir_start(struct pixcir_i2c_ts_data *ts)
257	{
258	struct device *dev = &ts->client->dev;
259	int error;
260
261	/* LEVEL_TOUCH interrupt with active low polarity */
262	error = pixcir_set_int_mode(ts, PIXCIR_INT_LEVEL_TOUCH, 0);
263	if (error) {
264	dev_err(dev, "Failed to set interrupt mode: %d\n", error);
265	return error;
266	}
267
268	ts->running = true;
269	mb(); /* Update status before IRQ can fire */
270
271	/* enable interrupt generation */
272	error = pixcir_int_enable(ts, true);
273	if (error) {
274	dev_err(dev, "Failed to enable interrupt generation: %d\n",
275	error);
276	return error;
277	}
278
279	return 0;
280	}
281
282	static int pixcir_stop(struct pixcir_i2c_ts_data *ts)
283	{
284	int error;
285
286	/* Disable interrupt generation */
287	error = pixcir_int_enable(ts, false);
288	if (error) {
289	dev_err(&ts->client->dev,
290	"Failed to disable interrupt generation: %d\n",
291	error);
292	return error;
293	}
294
295	/* Exit ISR if running, no more report parsing */
296	ts->running = false;
297	mb(); /* update status before we synchronize irq */
298
299	/* Wait till running ISR is complete */
300	synchronize_irq(ts->client->irq);
301
302	return 0;
303	}
304
305	static int pixcir_input_open(struct input_dev *dev)
306	{
307	struct pixcir_i2c_ts_data *ts = input_get_drvdata(dev);
308
309	return pixcir_start(ts);
310	}
311
312	static void pixcir_input_close(struct input_dev *dev)
313	{
314	struct pixcir_i2c_ts_data *ts = input_get_drvdata(dev);
315
316	pixcir_stop(ts);
317	}
318
36a281e2 JB	319	#ifdef CONFIG_PM_SLEEP
	320	static int pixcir_i2c_ts_suspend(struct device *dev)
	321	{
	322	struct i2c_client *client = to_i2c_client(dev);
7cdcb8d1 RQ	323	struct pixcir_i2c_ts_data *ts = i2c_get_clientdata(client);
	324	struct input_dev *input = ts->input;
	325	int ret = 0;
	326
	327	mutex_lock(&input->mutex);
	328
	329	if (device_may_wakeup(&client->dev)) {
	330	if (!input->users) {
	331	ret = pixcir_start(ts);
	332	if (ret) {
	333	dev_err(dev, "Failed to start\n");
	334	goto unlock;
	335	}
	336	}
36a281e2	337
36a281e2	338	enable_irq_wake(client->irq);
7cdcb8d1 RQ	339	} else if (input->users) {
	340	ret = pixcir_stop(ts);
	341	}
36a281e2	342
7cdcb8d1 RQ	343	unlock:
	344	mutex_unlock(&input->mutex);
	345
	346	return ret;
36a281e2 JB	347	}
	348
	349	static int pixcir_i2c_ts_resume(struct device *dev)
	350	{
	351	struct i2c_client *client = to_i2c_client(dev);
7cdcb8d1 RQ	352	struct pixcir_i2c_ts_data *ts = i2c_get_clientdata(client);
	353	struct input_dev *input = ts->input;
	354	int ret = 0;
	355
	356	mutex_lock(&input->mutex);
36a281e2	357
7cdcb8d1	358	if (device_may_wakeup(&client->dev)) {
36a281e2 JB	359	disable_irq_wake(client->irq);
36a281e2 JB	360
7cdcb8d1 RQ	361	if (!input->users) {
	362	ret = pixcir_stop(ts);
	363	if (ret) {
	364	dev_err(dev, "Failed to stop\n");
	365	goto unlock;
	366	}
	367	}
	368	} else if (input->users) {
	369	ret = pixcir_start(ts);
	370	}
	371
	372	unlock:
	373	mutex_unlock(&input->mutex);
	374
	375	return ret;
36a281e2 JB	376	}
	377	#endif
	378
	379	static SIMPLE_DEV_PM_OPS(pixcir_dev_pm_ops,
	380	pixcir_i2c_ts_suspend, pixcir_i2c_ts_resume);
	381
5298cc4c	382	static int pixcir_i2c_ts_probe(struct i2c_client *client,
36a281e2 JB	383	const struct i2c_device_id *id)
36a281e2 JB	384	{
c838cb3d JH	385	const struct pixcir_ts_platform_data *pdata =
c838cb3d JH	386	dev_get_platdata(&client->dev);
e9d4718d	387	struct device *dev = &client->dev;
36a281e2 JB	388	struct pixcir_i2c_ts_data *tsdata;
	389	struct input_dev *input;
	390	int error;
	391
	392	if (!pdata) {
	393	dev_err(&client->dev, "platform data not defined\n");
	394	return -EINVAL;
	395	}
	396
0dfc8d41 RQ	397	if (!gpio_is_valid(pdata->gpio_attb)) {
	398	dev_err(dev, "Invalid gpio_attb in pdata\n");
	399	return -EINVAL;
	400	}
	401
e9d4718d RQ	402	tsdata = devm_kzalloc(dev, sizeof(*tsdata), GFP_KERNEL);
	403	if (!tsdata)
	404	return -ENOMEM;
	405
	406	input = devm_input_allocate_device(dev);
	407	if (!input) {
	408	dev_err(dev, "Failed to allocate input device\n");
	409	return -ENOMEM;
36a281e2 JB	410	}
	411
	412	tsdata->client = client;
	413	tsdata->input = input;
	414	tsdata->chip = pdata;
	415
	416	input->name = client->name;
	417	input->id.bustype = BUS_I2C;
3b36fbb0 RQ	418	input->open = pixcir_input_open;
3b36fbb0 RQ	419	input->close = pixcir_input_close;
36a281e2 JB	420	input->dev.parent = &client->dev;
	421
	422	__set_bit(EV_KEY, input->evbit);
	423	__set_bit(EV_ABS, input->evbit);
	424	__set_bit(BTN_TOUCH, input->keybit);
	425	input_set_abs_params(input, ABS_X, 0, pdata->x_max, 0, 0);
	426	input_set_abs_params(input, ABS_Y, 0, pdata->y_max, 0, 0);
	427	input_set_abs_params(input, ABS_MT_POSITION_X, 0, pdata->x_max, 0, 0);
	428	input_set_abs_params(input, ABS_MT_POSITION_Y, 0, pdata->y_max, 0, 0);
	429
62e65b7e RQ	430	error = input_mt_init_slots(input, PIXCIR_MAX_SLOTS,
	431	INPUT_MT_DIRECT \| INPUT_MT_DROP_UNUSED);
	432	if (error) {
	433	dev_err(dev, "Error initializing Multi-Touch slots\n");
	434	return error;
	435	}
	436
36a281e2 JB	437	input_set_drvdata(input, tsdata);
36a281e2 JB	438
0dfc8d41 RQ	439	error = devm_gpio_request_one(dev, pdata->gpio_attb,
	440	GPIOF_DIR_IN, "pixcir_i2c_attb");
	441	if (error) {
	442	dev_err(dev, "Failed to request ATTB gpio\n");
	443	return error;
	444	}
	445
e9d4718d RQ	446	error = devm_request_threaded_irq(dev, client->irq, NULL, pixcir_ts_isr,
	447	IRQF_TRIGGER_FALLING \| IRQF_ONESHOT,
	448	client->name, tsdata);
36a281e2	449	if (error) {
e9d4718d RQ	450	dev_err(dev, "failed to request irq %d\n", client->irq);
e9d4718d RQ	451	return error;
36a281e2 JB	452	}
36a281e2 JB	453
3b36fbb0 RQ	454	/* Always be in IDLE mode to save power, device supports auto wake */
	455	error = pixcir_set_power_mode(tsdata, PIXCIR_POWER_IDLE);
	456	if (error) {
	457	dev_err(dev, "Failed to set IDLE mode\n");
	458	return error;
	459	}
	460
	461	/* Stop device till opened */
	462	error = pixcir_stop(tsdata);
	463	if (error)
	464	return error;
	465
36a281e2 JB	466	error = input_register_device(input);
36a281e2 JB	467	if (error)
e9d4718d	468	return error;
36a281e2	469
7cdcb8d1	470	i2c_set_clientdata(client, tsdata);
36a281e2 JB	471	device_init_wakeup(&client->dev, 1);
	472
	473	return 0;
36a281e2 JB	474	}
36a281e2 JB	475
e2619cf7	476	static int pixcir_i2c_ts_remove(struct i2c_client *client)
36a281e2	477	{
36a281e2 JB	478	device_init_wakeup(&client->dev, 0);
36a281e2 JB	479
36a281e2 JB	480	return 0;
	481	}
	482
	483	static const struct i2c_device_id pixcir_i2c_ts_id[] = {
	484	{ "pixcir_ts", 0 },
	485	{ }
	486	};
	487	MODULE_DEVICE_TABLE(i2c, pixcir_i2c_ts_id);
	488
	489	static struct i2c_driver pixcir_i2c_ts_driver = {
	490	.driver = {
	491	.owner = THIS_MODULE,
	492	.name = "pixcir_ts",
	493	.pm = &pixcir_dev_pm_ops,
	494	},
	495	.probe = pixcir_i2c_ts_probe,
1cb0aa88	496	.remove = pixcir_i2c_ts_remove,
36a281e2 JB	497	.id_table = pixcir_i2c_ts_id,
	498	};
	499
4a533835	500	module_i2c_driver(pixcir_i2c_ts_driver);
36a281e2 JB	501
	502	MODULE_AUTHOR("Jianchun Bian <jcbian@pixcir.com.cn>, Dequan Meng <dqmeng@pixcir.com.cn>");
	503	MODULE_DESCRIPTION("Pixcir I2C Touchscreen Driver");
	504	MODULE_LICENSE("GPL");