[deliverable/linux.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/gpio.h>
#include <linux/gpio/consumer.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_data/pixcir_i2c_ts.h>

#define PIXCIR_MAX_SLOTS       5 /* Max fingers supported by driver */

struct pixcir_i2c_ts_data {
	struct i2c_client *client;
	struct input_dev *input;
	struct gpio_desc *gpio_attb;
	struct gpio_desc *gpio_reset;
	const struct pixcir_ts_platform_data *pdata;
	bool running;
	int max_fingers;	/* Max fingers supported in this instance */
};

struct pixcir_touch {
	int x;
	int y;
	int id;
};

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[2 + PIXCIR_MAX_SLOTS * 5];
	u8 wrbuf[1] = { 0 };
	u8 *bufptr;
	u8 touch;
	int ret, i;
	int readsize;
	const struct pixcir_i2c_chip_data *chip = &tsdata->pdata->chip;

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

	i = chip->has_hw_ids ? 1 : 0;
	readsize = 2 + tsdata->max_fingers * (4 + i);
	if (readsize > sizeof(rdbuf))
		readsize = sizeof(rdbuf);

	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, readsize);
	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 > tsdata->max_fingers)
		touch = tsdata->max_fingers;

	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];

		if (chip->has_hw_ids) {
			report->touches[i].id = bufptr[4];
			bufptr = bufptr + 5;
		} else {
			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;
	const struct pixcir_i2c_chip_data *chip = &ts->pdata->chip;

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

	if (!chip->has_hw_ids) {
		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, 0);
	}

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

		if (chip->has_hw_ids) {
			slot = input_mt_get_slot_by_key(ts->input, touch->id);
			if (slot < 0) {
				dev_dbg(dev, "no free slot for id 0x%x\n",
					touch->id);
				continue;
			}
		} else {
			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;
	struct pixcir_report_data report;

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

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

		if (gpiod_get_value_cansleep(tsdata->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 void pixcir_reset(struct pixcir_i2c_ts_data *tsdata)
{
	if (!IS_ERR_OR_NULL(tsdata->gpio_reset)) {
		gpiod_set_value_cansleep(tsdata->gpio_reset, 1);
		ndelay(100);	/* datasheet section 1.2.3 says 80ns min. */
		gpiod_set_value_cansleep(tsdata->gpio_reset, 0);
		/* wait for controller ready. 100ms guess. */
		msleep(100);
	}
}

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);
}

static int __maybe_unused 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 __maybe_unused 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;
}

static SIMPLE_DEV_PM_OPS(pixcir_dev_pm_ops,
			 pixcir_i2c_ts_suspend, pixcir_i2c_ts_resume);

#ifdef CONFIG_OF
static const struct of_device_id pixcir_of_match[];

static struct pixcir_ts_platform_data *pixcir_parse_dt(struct device *dev)
{
	struct pixcir_ts_platform_data *pdata;
	struct device_node *np = dev->of_node;
	const struct of_device_id *match;

	match = of_match_device(of_match_ptr(pixcir_of_match), dev);
	if (!match)
		return ERR_PTR(-EINVAL);

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

	pdata->chip = *(const struct pixcir_i2c_chip_data *)match->data;

	if (of_property_read_u32(np, "touchscreen-size-x", &pdata->x_max)) {
		dev_err(dev, "Failed to get touchscreen-size-x property\n");
		return ERR_PTR(-EINVAL);
	}
	pdata->x_max -= 1;

	if (of_property_read_u32(np, "touchscreen-size-y", &pdata->y_max)) {
		dev_err(dev, "Failed to get touchscreen-size-y property\n");
		return ERR_PTR(-EINVAL);
	}
	pdata->y_max -= 1;

	dev_dbg(dev, "%s: x %d, y %d\n", __func__,
		pdata->x_max + 1, pdata->y_max + 1);

	return pdata;
}
#else
static struct pixcir_ts_platform_data *pixcir_parse_dt(struct device *dev)
{
	return ERR_PTR(-EINVAL);
}
#endif

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 device_node *np = dev->of_node;
	struct pixcir_i2c_ts_data *tsdata;
	struct input_dev *input;
	int error;

	if (np && !pdata) {
		pdata = pixcir_parse_dt(dev);
		if (IS_ERR(pdata))
			return PTR_ERR(pdata);
	}

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

	if (!pdata->chip.max_fingers) {
		dev_err(dev, "Invalid max_fingers 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->pdata = 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;

	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);

	tsdata->max_fingers = tsdata->pdata->chip.max_fingers;
	if (tsdata->max_fingers > PIXCIR_MAX_SLOTS) {
		tsdata->max_fingers = PIXCIR_MAX_SLOTS;
		dev_info(dev, "Limiting maximum fingers to %d\n",
			 tsdata->max_fingers);
	}

	error = input_mt_init_slots(input, tsdata->max_fingers,
				    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);

	tsdata->gpio_attb = devm_gpiod_get(dev, "attb", GPIOD_IN);
	if (IS_ERR(tsdata->gpio_attb)) {
		error = PTR_ERR(tsdata->gpio_attb);
		dev_err(dev, "Failed to request ATTB gpio: %d\n", error);
		return error;
	}

	tsdata->gpio_reset = devm_gpiod_get_optional(dev, "reset",
						     GPIOD_OUT_LOW);
	if (IS_ERR(tsdata->gpio_reset)) {
		error = PTR_ERR(tsdata->gpio_reset);
		dev_err(dev, "Failed to request RESET gpio: %d\n", error);
		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;
	}

	pixcir_reset(tsdata);

	/* 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 },
	{ "pixcir_tangoc", 0 },
	{ }
};
MODULE_DEVICE_TABLE(i2c, pixcir_i2c_ts_id);

#ifdef CONFIG_OF
static const struct pixcir_i2c_chip_data pixcir_ts_data = {
	.max_fingers = 2,
	/* no hw id support */
};

static const struct pixcir_i2c_chip_data pixcir_tangoc_data = {
	.max_fingers = 5,
	.has_hw_ids = true,
};

static const struct of_device_id pixcir_of_match[] = {
	{ .compatible = "pixcir,pixcir_ts", .data = &pixcir_ts_data },
	{ .compatible = "pixcir,pixcir_tangoc", .data = &pixcir_tangoc_data },
	{ }
};
MODULE_DEVICE_TABLE(of, pixcir_of_match);
#endif

static struct i2c_driver pixcir_i2c_ts_driver = {
	.driver = {
		.owner	= THIS_MODULE,
		.name	= "pixcir_ts",
		.pm	= &pixcir_dev_pm_ops,
		.of_match_table = of_match_ptr(pixcir_of_match),
	},
	.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>
0dfc8d41	27	#include <linux/gpio.h>
cb4a5f06	28	#include <linux/gpio/consumer.h>
a4054596	29	#include <linux/of.h>
a4054596	30	#include <linux/of_device.h>
28a74c05	31	#include <linux/platform_data/pixcir_i2c_ts.h>
36a281e2	32
36874c7e	33	#define PIXCIR_MAX_SLOTS 5 /* Max fingers supported by driver */
62e65b7e	34
36a281e2 JB	35	struct pixcir_i2c_ts_data {
	36	struct i2c_client *client;
	37	struct input_dev *input;
cb4a5f06	38	struct gpio_desc *gpio_attb;
40929167	39	struct gpio_desc *gpio_reset;
36874c7e	40	const struct pixcir_ts_platform_data *pdata;
3b36fbb0	41	bool running;
36874c7e	42	int max_fingers; /* Max fingers supported in this instance */
36a281e2 JB	43	};
36a281e2 JB	44
62e65b7e RQ	45	struct pixcir_touch {
	46	int x;
	47	int y;
36874c7e	48	int id;
62e65b7e RQ	49	};
	50
	51	struct pixcir_report_data {
	52	int num_touches;
	53	struct pixcir_touch touches[PIXCIR_MAX_SLOTS];
	54	};
	55
	56	static void pixcir_ts_parse(struct pixcir_i2c_ts_data *tsdata,
	57	struct pixcir_report_data *report)
36a281e2	58	{
36874c7e RQ	59	u8 rdbuf[2 + PIXCIR_MAX_SLOTS * 5];
36874c7e RQ	60	u8 wrbuf[1] = { 0 };
62e65b7e	61	u8 *bufptr;
36a281e2	62	u8 touch;
62e65b7e	63	int ret, i;
36874c7e RQ	64	int readsize;
36874c7e RQ	65	const struct pixcir_i2c_chip_data *chip = &tsdata->pdata->chip;
62e65b7e RQ	66
62e65b7e RQ	67	memset(report, 0, sizeof(struct pixcir_report_data));
36a281e2	68
36874c7e RQ	69	i = chip->has_hw_ids ? 1 : 0;
	70	readsize = 2 + tsdata->max_fingers * (4 + i);
	71	if (readsize > sizeof(rdbuf))
	72	readsize = sizeof(rdbuf);
	73
36a281e2 JB	74	ret = i2c_master_send(tsdata->client, wrbuf, sizeof(wrbuf));
	75	if (ret != sizeof(wrbuf)) {
	76	dev_err(&tsdata->client->dev,
	77	"%s: i2c_master_send failed(), ret=%d\n",
	78	__func__, ret);
	79	return;
	80	}
	81
36874c7e	82	ret = i2c_master_recv(tsdata->client, rdbuf, readsize);
36a281e2 JB	83	if (ret != sizeof(rdbuf)) {
	84	dev_err(&tsdata->client->dev,
	85	"%s: i2c_master_recv failed(), ret=%d\n",
	86	__func__, ret);
	87	return;
	88	}
	89
62e65b7e	90	touch = rdbuf[0] & 0x7;
36874c7e RQ	91	if (touch > tsdata->max_fingers)
36874c7e RQ	92	touch = tsdata->max_fingers;
62e65b7e RQ	93
	94	report->num_touches = touch;
	95	bufptr = &rdbuf[2];
	96
	97	for (i = 0; i < touch; i++) {
	98	report->touches[i].x = (bufptr[1] << 8) \| bufptr[0];
	99	report->touches[i].y = (bufptr[3] << 8) \| bufptr[2];
	100
36874c7e RQ	101	if (chip->has_hw_ids) {
	102	report->touches[i].id = bufptr[4];
	103	bufptr = bufptr + 5;
	104	} else {
	105	bufptr = bufptr + 4;
	106	}
36a281e2	107	}
62e65b7e RQ	108	}
	109
	110	static void pixcir_ts_report(struct pixcir_i2c_ts_data *ts,
	111	struct pixcir_report_data *report)
	112	{
	113	struct input_mt_pos pos[PIXCIR_MAX_SLOTS];
	114	int slots[PIXCIR_MAX_SLOTS];
	115	struct pixcir_touch *touch;
	116	int n, i, slot;
	117	struct device *dev = &ts->client->dev;
36874c7e	118	const struct pixcir_i2c_chip_data *chip = &ts->pdata->chip;
62e65b7e RQ	119
	120	n = report->num_touches;
	121	if (n > PIXCIR_MAX_SLOTS)
	122	n = PIXCIR_MAX_SLOTS;
36a281e2	123
36874c7e RQ	124	if (!chip->has_hw_ids) {
	125	for (i = 0; i < n; i++) {
	126	touch = &report->touches[i];
	127	pos[i].x = touch->x;
	128	pos[i].y = touch->y;
	129	}
62e65b7e	130
448c7f38	131	input_mt_assign_slots(ts->input, slots, pos, n, 0);
36874c7e	132	}
62e65b7e RQ	133
	134	for (i = 0; i < n; i++) {
	135	touch = &report->touches[i];
36874c7e RQ	136
	137	if (chip->has_hw_ids) {
	138	slot = input_mt_get_slot_by_key(ts->input, touch->id);
	139	if (slot < 0) {
	140	dev_dbg(dev, "no free slot for id 0x%x\n",
	141	touch->id);
	142	continue;
	143	}
	144	} else {
	145	slot = slots[i];
	146	}
62e65b7e RQ	147
	148	input_mt_slot(ts->input, slot);
	149	input_mt_report_slot_state(ts->input,
	150	MT_TOOL_FINGER, true);
	151
	152	input_event(ts->input, EV_ABS, ABS_MT_POSITION_X, touch->x);
	153	input_event(ts->input, EV_ABS, ABS_MT_POSITION_Y, touch->y);
	154
	155	dev_dbg(dev, "%d: slot %d, x %d, y %d\n",
	156	i, slot, touch->x, touch->y);
	157	}
	158
	159	input_mt_sync_frame(ts->input);
	160	input_sync(ts->input);
36a281e2 JB	161	}
	162
	163	static irqreturn_t pixcir_ts_isr(int irq, void *dev_id)
	164	{
	165	struct pixcir_i2c_ts_data *tsdata = dev_id;
62e65b7e	166	struct pixcir_report_data report;
36a281e2	167
3b36fbb0	168	while (tsdata->running) {
62e65b7e RQ	169	/* parse packet */
	170	pixcir_ts_parse(tsdata, &report);
	171
	172	/* report it */
	173	pixcir_ts_report(tsdata, &report);
	174
127520ca	175	if (gpiod_get_value_cansleep(tsdata->gpio_attb)) {
62e65b7e RQ	176	if (report.num_touches) {
	177	/*
	178	* Last report with no finger up?
	179	* Do it now then.
	180	*/
	181	input_mt_sync_frame(tsdata->input);
	182	input_sync(tsdata->input);
	183	}
36a281e2	184	break;
62e65b7e	185	}
36a281e2 JB	186
	187	msleep(20);
	188	}
	189
	190	return IRQ_HANDLED;
	191	}
	192
40929167 RQ	193	static void pixcir_reset(struct pixcir_i2c_ts_data *tsdata)
	194	{
	195	if (!IS_ERR_OR_NULL(tsdata->gpio_reset)) {
	196	gpiod_set_value_cansleep(tsdata->gpio_reset, 1);
	197	ndelay(100); /* datasheet section 1.2.3 says 80ns min. */
	198	gpiod_set_value_cansleep(tsdata->gpio_reset, 0);
	199	/* wait for controller ready. 100ms guess. */
	200	msleep(100);
	201	}
	202	}
	203
3b36fbb0 RQ	204	static int pixcir_set_power_mode(struct pixcir_i2c_ts_data *ts,
	205	enum pixcir_power_mode mode)
	206	{
	207	struct device *dev = &ts->client->dev;
	208	int ret;
	209
	210	ret = i2c_smbus_read_byte_data(ts->client, PIXCIR_REG_POWER_MODE);
	211	if (ret < 0) {
	212	dev_err(dev, "%s: can't read reg 0x%x : %d\n",
	213	__func__, PIXCIR_REG_POWER_MODE, ret);
	214	return ret;
	215	}
	216
	217	ret &= ~PIXCIR_POWER_MODE_MASK;
	218	ret \|= mode;
	219
	220	/* Always AUTO_IDLE */
	221	ret \|= PIXCIR_POWER_ALLOW_IDLE;
	222
	223	ret = i2c_smbus_write_byte_data(ts->client, PIXCIR_REG_POWER_MODE, ret);
	224	if (ret < 0) {
	225	dev_err(dev, "%s: can't write reg 0x%x : %d\n",
	226	__func__, PIXCIR_REG_POWER_MODE, ret);
	227	return ret;
	228	}
	229
	230	return 0;
	231	}
	232
	233	/*
	234	* Set the interrupt mode for the device i.e. ATTB line behaviour
	235	*
	236	* @polarity : 1 for active high, 0 for active low.
	237	*/
	238	static int pixcir_set_int_mode(struct pixcir_i2c_ts_data *ts,
	239	enum pixcir_int_mode mode, bool polarity)
	240	{
	241	struct device *dev = &ts->client->dev;
	242	int ret;
	243
	244	ret = i2c_smbus_read_byte_data(ts->client, PIXCIR_REG_INT_MODE);
	245	if (ret < 0) {
	246	dev_err(dev, "%s: can't read reg 0x%x : %d\n",
	247	__func__, PIXCIR_REG_INT_MODE, ret);
	248	return ret;
	249	}
	250
	251	ret &= ~PIXCIR_INT_MODE_MASK;
	252	ret \|= mode;
	253
	254	if (polarity)
	255	ret \|= PIXCIR_INT_POL_HIGH;
	256	else
	257	ret &= ~PIXCIR_INT_POL_HIGH;
	258
	259	ret = i2c_smbus_write_byte_data(ts->client, PIXCIR_REG_INT_MODE, ret);
	260	if (ret < 0) {
	261	dev_err(dev, "%s: can't write reg 0x%x : %d\n",
	262	__func__, PIXCIR_REG_INT_MODE, ret);
	263	return ret;
	264	}
	265
	266	return 0;
	267	}
268
269	/*
270	* Enable/disable interrupt generation
271	*/
272	static int pixcir_int_enable(struct pixcir_i2c_ts_data *ts, bool enable)
273	{
274	struct device *dev = &ts->client->dev;
275	int ret;
276
277	ret = i2c_smbus_read_byte_data(ts->client, PIXCIR_REG_INT_MODE);
278	if (ret < 0) {
279	dev_err(dev, "%s: can't read reg 0x%x : %d\n",
280	__func__, PIXCIR_REG_INT_MODE, ret);
281	return ret;
282	}
283
284	if (enable)
285	ret \|= PIXCIR_INT_ENABLE;
286	else
287	ret &= ~PIXCIR_INT_ENABLE;
288
289	ret = i2c_smbus_write_byte_data(ts->client, PIXCIR_REG_INT_MODE, ret);
290	if (ret < 0) {
291	dev_err(dev, "%s: can't write reg 0x%x : %d\n",
292	__func__, PIXCIR_REG_INT_MODE, ret);
293	return ret;
294	}
295
296	return 0;
297	}
298
299	static int pixcir_start(struct pixcir_i2c_ts_data *ts)
300	{
301	struct device *dev = &ts->client->dev;
302	int error;
303
304	/* LEVEL_TOUCH interrupt with active low polarity */
305	error = pixcir_set_int_mode(ts, PIXCIR_INT_LEVEL_TOUCH, 0);
306	if (error) {
307	dev_err(dev, "Failed to set interrupt mode: %d\n", error);
308	return error;
309	}
310
311	ts->running = true;
312	mb(); /* Update status before IRQ can fire */
313
314	/* enable interrupt generation */
315	error = pixcir_int_enable(ts, true);
316	if (error) {
317	dev_err(dev, "Failed to enable interrupt generation: %d\n",
318	error);
319	return error;
320	}
321
322	return 0;
323	}
324
325	static int pixcir_stop(struct pixcir_i2c_ts_data *ts)
326	{
327	int error;
328
329	/* Disable interrupt generation */
330	error = pixcir_int_enable(ts, false);
331	if (error) {
332	dev_err(&ts->client->dev,
333	"Failed to disable interrupt generation: %d\n",
334	error);
335	return error;
336	}
337
338	/* Exit ISR if running, no more report parsing */
339	ts->running = false;
340	mb(); /* update status before we synchronize irq */
341
342	/* Wait till running ISR is complete */
343	synchronize_irq(ts->client->irq);
344
345	return 0;
346	}
347
348	static int pixcir_input_open(struct input_dev *dev)
349	{
350	struct pixcir_i2c_ts_data *ts = input_get_drvdata(dev);
351
352	return pixcir_start(ts);
353	}
354
355	static void pixcir_input_close(struct input_dev *dev)
356	{
357	struct pixcir_i2c_ts_data *ts = input_get_drvdata(dev);
358
359	pixcir_stop(ts);
360	}
361
02b6a58b	362	static int __maybe_unused pixcir_i2c_ts_suspend(struct device *dev)
36a281e2 JB	363	{
36a281e2 JB	364	struct i2c_client *client = to_i2c_client(dev);
7cdcb8d1 RQ	365	struct pixcir_i2c_ts_data *ts = i2c_get_clientdata(client);
	366	struct input_dev *input = ts->input;
	367	int ret = 0;
	368
	369	mutex_lock(&input->mutex);
	370
	371	if (device_may_wakeup(&client->dev)) {
	372	if (!input->users) {
	373	ret = pixcir_start(ts);
	374	if (ret) {
	375	dev_err(dev, "Failed to start\n");
	376	goto unlock;
	377	}
	378	}
36a281e2	379
36a281e2	380	enable_irq_wake(client->irq);
7cdcb8d1 RQ	381	} else if (input->users) {
	382	ret = pixcir_stop(ts);
	383	}
36a281e2	384
7cdcb8d1 RQ	385	unlock:
	386	mutex_unlock(&input->mutex);
	387
	388	return ret;
36a281e2 JB	389	}
36a281e2 JB	390
02b6a58b	391	static int __maybe_unused pixcir_i2c_ts_resume(struct device *dev)
36a281e2 JB	392	{
36a281e2 JB	393	struct i2c_client *client = to_i2c_client(dev);
7cdcb8d1 RQ	394	struct pixcir_i2c_ts_data *ts = i2c_get_clientdata(client);
	395	struct input_dev *input = ts->input;
	396	int ret = 0;
	397
	398	mutex_lock(&input->mutex);
36a281e2	399
7cdcb8d1	400	if (device_may_wakeup(&client->dev)) {
36a281e2 JB	401	disable_irq_wake(client->irq);
36a281e2 JB	402
7cdcb8d1 RQ	403	if (!input->users) {
	404	ret = pixcir_stop(ts);
	405	if (ret) {
	406	dev_err(dev, "Failed to stop\n");
	407	goto unlock;
	408	}
	409	}
	410	} else if (input->users) {
	411	ret = pixcir_start(ts);
	412	}
	413
	414	unlock:
	415	mutex_unlock(&input->mutex);
	416
	417	return ret;
36a281e2	418	}
36a281e2 JB	419
	420	static SIMPLE_DEV_PM_OPS(pixcir_dev_pm_ops,
	421	pixcir_i2c_ts_suspend, pixcir_i2c_ts_resume);
	422
a4054596 RQ	423	#ifdef CONFIG_OF
	424	static const struct of_device_id pixcir_of_match[];
	425
	426	static struct pixcir_ts_platform_data pixcir_parse_dt(struct device dev)
	427	{
	428	struct pixcir_ts_platform_data *pdata;
	429	struct device_node *np = dev->of_node;
	430	const struct of_device_id *match;
	431
	432	match = of_match_device(of_match_ptr(pixcir_of_match), dev);
	433	if (!match)
	434	return ERR_PTR(-EINVAL);
	435
	436	pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
	437	if (!pdata)
	438	return ERR_PTR(-ENOMEM);
	439
	440	pdata->chip = (const struct pixcir_i2c_chip_data )match->data;
	441
a4054596 RQ	442	if (of_property_read_u32(np, "touchscreen-size-x", &pdata->x_max)) {
	443	dev_err(dev, "Failed to get touchscreen-size-x property\n");
	444	return ERR_PTR(-EINVAL);
	445	}
	446	pdata->x_max -= 1;
	447
	448	if (of_property_read_u32(np, "touchscreen-size-y", &pdata->y_max)) {
	449	dev_err(dev, "Failed to get touchscreen-size-y property\n");
	450	return ERR_PTR(-EINVAL);
	451	}
	452	pdata->y_max -= 1;
	453
cb4a5f06 DT	454	dev_dbg(dev, "%s: x %d, y %d\n", __func__,
cb4a5f06 DT	455	pdata->x_max + 1, pdata->y_max + 1);
a4054596 RQ	456
	457	return pdata;
	458	}
	459	#else
	460	static struct pixcir_ts_platform_data pixcir_parse_dt(struct device dev)
	461	{
	462	return ERR_PTR(-EINVAL);
	463	}
	464	#endif
	465
5298cc4c	466	static int pixcir_i2c_ts_probe(struct i2c_client *client,
36a281e2 JB	467	const struct i2c_device_id *id)
36a281e2 JB	468	{
c838cb3d JH	469	const struct pixcir_ts_platform_data *pdata =
c838cb3d JH	470	dev_get_platdata(&client->dev);
e9d4718d	471	struct device *dev = &client->dev;
a4054596	472	struct device_node *np = dev->of_node;
36a281e2 JB	473	struct pixcir_i2c_ts_data *tsdata;
	474	struct input_dev *input;
	475	int error;
	476
a4054596 RQ	477	if (np && !pdata) {
	478	pdata = pixcir_parse_dt(dev);
	479	if (IS_ERR(pdata))
	480	return PTR_ERR(pdata);
	481	}
	482
36a281e2 JB	483	if (!pdata) {
	484	dev_err(&client->dev, "platform data not defined\n");
	485	return -EINVAL;
	486	}
	487
36874c7e RQ	488	if (!pdata->chip.max_fingers) {
	489	dev_err(dev, "Invalid max_fingers in pdata\n");
	490	return -EINVAL;
	491	}
	492
e9d4718d RQ	493	tsdata = devm_kzalloc(dev, sizeof(*tsdata), GFP_KERNEL);
	494	if (!tsdata)
	495	return -ENOMEM;
	496
	497	input = devm_input_allocate_device(dev);
	498	if (!input) {
	499	dev_err(dev, "Failed to allocate input device\n");
	500	return -ENOMEM;
36a281e2 JB	501	}
	502
	503	tsdata->client = client;
	504	tsdata->input = input;
36874c7e	505	tsdata->pdata = pdata;
36a281e2 JB	506
	507	input->name = client->name;
	508	input->id.bustype = BUS_I2C;
3b36fbb0 RQ	509	input->open = pixcir_input_open;
3b36fbb0 RQ	510	input->close = pixcir_input_close;
36a281e2 JB	511	input->dev.parent = &client->dev;
36a281e2 JB	512
36a281e2 JB	513	input_set_abs_params(input, ABS_MT_POSITION_X, 0, pdata->x_max, 0, 0);
	514	input_set_abs_params(input, ABS_MT_POSITION_Y, 0, pdata->y_max, 0, 0);
	515
36874c7e RQ	516	tsdata->max_fingers = tsdata->pdata->chip.max_fingers;
	517	if (tsdata->max_fingers > PIXCIR_MAX_SLOTS) {
	518	tsdata->max_fingers = PIXCIR_MAX_SLOTS;
	519	dev_info(dev, "Limiting maximum fingers to %d\n",
	520	tsdata->max_fingers);
	521	}
	522
	523	error = input_mt_init_slots(input, tsdata->max_fingers,
62e65b7e RQ	524	INPUT_MT_DIRECT \| INPUT_MT_DROP_UNUSED);
	525	if (error) {
	526	dev_err(dev, "Error initializing Multi-Touch slots\n");
	527	return error;
	528	}
	529
36a281e2 JB	530	input_set_drvdata(input, tsdata);
36a281e2 JB	531
cb4a5f06 DT	532	tsdata->gpio_attb = devm_gpiod_get(dev, "attb", GPIOD_IN);
	533	if (IS_ERR(tsdata->gpio_attb)) {
	534	error = PTR_ERR(tsdata->gpio_attb);
	535	dev_err(dev, "Failed to request ATTB gpio: %d\n", error);
0dfc8d41 RQ	536	return error;
	537	}
	538
40929167 RQ	539	tsdata->gpio_reset = devm_gpiod_get_optional(dev, "reset",
	540	GPIOD_OUT_LOW);
	541	if (IS_ERR(tsdata->gpio_reset)) {
	542	error = PTR_ERR(tsdata->gpio_reset);
	543	dev_err(dev, "Failed to request RESET gpio: %d\n", error);
	544	return error;
	545	}
	546
e9d4718d RQ	547	error = devm_request_threaded_irq(dev, client->irq, NULL, pixcir_ts_isr,
	548	IRQF_TRIGGER_FALLING \| IRQF_ONESHOT,
	549	client->name, tsdata);
36a281e2	550	if (error) {
e9d4718d RQ	551	dev_err(dev, "failed to request irq %d\n", client->irq);
e9d4718d RQ	552	return error;
36a281e2 JB	553	}
36a281e2 JB	554
40929167 RQ	555	pixcir_reset(tsdata);
40929167 RQ	556
3b36fbb0 RQ	557	/* Always be in IDLE mode to save power, device supports auto wake */
	558	error = pixcir_set_power_mode(tsdata, PIXCIR_POWER_IDLE);
	559	if (error) {
	560	dev_err(dev, "Failed to set IDLE mode\n");
	561	return error;
	562	}
	563
	564	/* Stop device till opened */
	565	error = pixcir_stop(tsdata);
	566	if (error)
	567	return error;
	568
36a281e2 JB	569	error = input_register_device(input);
36a281e2 JB	570	if (error)
e9d4718d	571	return error;
36a281e2	572
7cdcb8d1	573	i2c_set_clientdata(client, tsdata);
36a281e2 JB	574	device_init_wakeup(&client->dev, 1);
	575
	576	return 0;
36a281e2 JB	577	}
36a281e2 JB	578
e2619cf7	579	static int pixcir_i2c_ts_remove(struct i2c_client *client)
36a281e2	580	{
36a281e2 JB	581	device_init_wakeup(&client->dev, 0);
36a281e2 JB	582
36a281e2 JB	583	return 0;
	584	}
	585
	586	static const struct i2c_device_id pixcir_i2c_ts_id[] = {
	587	{ "pixcir_ts", 0 },
a4054596	588	{ "pixcir_tangoc", 0 },
36a281e2 JB	589	{ }
	590	};
	591	MODULE_DEVICE_TABLE(i2c, pixcir_i2c_ts_id);
	592
a4054596 RQ	593	#ifdef CONFIG_OF
	594	static const struct pixcir_i2c_chip_data pixcir_ts_data = {
	595	.max_fingers = 2,
	596	/* no hw id support */
	597	};
	598
	599	static const struct pixcir_i2c_chip_data pixcir_tangoc_data = {
	600	.max_fingers = 5,
	601	.has_hw_ids = true,
	602	};
	603
	604	static const struct of_device_id pixcir_of_match[] = {
	605	{ .compatible = "pixcir,pixcir_ts", .data = &pixcir_ts_data },
	606	{ .compatible = "pixcir,pixcir_tangoc", .data = &pixcir_tangoc_data },
	607	{ }
	608	};
	609	MODULE_DEVICE_TABLE(of, pixcir_of_match);
	610	#endif
	611
36a281e2 JB	612	static struct i2c_driver pixcir_i2c_ts_driver = {
	613	.driver = {
	614	.owner = THIS_MODULE,
	615	.name = "pixcir_ts",
	616	.pm = &pixcir_dev_pm_ops,
a4054596	617	.of_match_table = of_match_ptr(pixcir_of_match),
36a281e2 JB	618	},
36a281e2 JB	619	.probe = pixcir_i2c_ts_probe,
1cb0aa88	620	.remove = pixcir_i2c_ts_remove,
36a281e2 JB	621	.id_table = pixcir_i2c_ts_id,
	622	};
	623
4a533835	624	module_i2c_driver(pixcir_i2c_ts_driver);
36a281e2 JB	625
	626	MODULE_AUTHOR("Jianchun Bian <jcbian@pixcir.com.cn>, Dequan Meng <dqmeng@pixcir.com.cn>");
	627	MODULE_DESCRIPTION("Pixcir I2C Touchscreen Driver");
	628	MODULE_LICENSE("GPL");