[linux-2.6-block.git] / drivers / input / touchscreen / surface3_spi.c

/*
 *  Driver for Ntrig/Microsoft Touchscreens over SPI
 *
 *  Copyright (c) 2016 Red Hat Inc.
 */

/*
 * 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; version 2 of the License.
 */

#include <linux/kernel.h>

#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/input.h>
#include <linux/input/mt.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/spi/spi.h>
#include <linux/acpi.h>

#include <asm/unaligned.h>

#define SURFACE3_PACKET_SIZE	264

#define SURFACE3_REPORT_TOUCH	0xd2
#define SURFACE3_REPORT_PEN	0x16

struct surface3_ts_data {
	struct spi_device *spi;
	struct gpio_desc *gpiod_rst[2];
	struct input_dev *input_dev;
	struct input_dev *pen_input_dev;
	int pen_tool;

	u8 rd_buf[SURFACE3_PACKET_SIZE]		____cacheline_aligned;
};

struct surface3_ts_data_finger {
	u8 status;
	__le16 tracking_id;
	__le16 x;
	__le16 cx;
	__le16 y;
	__le16 cy;
	__le16 width;
	__le16 height;
	u32 padding;
} __packed;

struct surface3_ts_data_pen {
	u8 status;
	__le16 x;
	__le16 y;
	__le16 pressure;
	u8 padding;
} __packed;

static int surface3_spi_read(struct surface3_ts_data *ts_data)
{
	struct spi_device *spi = ts_data->spi;

	memset(ts_data->rd_buf, 0, sizeof(ts_data->rd_buf));
	return spi_read(spi, ts_data->rd_buf, sizeof(ts_data->rd_buf));
}

static void surface3_spi_report_touch(struct surface3_ts_data *ts_data,
				   struct surface3_ts_data_finger *finger)
{
	int st = finger->status & 0x01;
	int slot;

	slot = input_mt_get_slot_by_key(ts_data->input_dev,
				get_unaligned_le16(&finger->tracking_id));
	if (slot < 0)
		return;

	input_mt_slot(ts_data->input_dev, slot);
	input_mt_report_slot_state(ts_data->input_dev, MT_TOOL_FINGER, st);
	if (st) {
		input_report_abs(ts_data->input_dev,
				 ABS_MT_POSITION_X,
				 get_unaligned_le16(&finger->x));
		input_report_abs(ts_data->input_dev,
				 ABS_MT_POSITION_Y,
				 get_unaligned_le16(&finger->y));
		input_report_abs(ts_data->input_dev,
				 ABS_MT_WIDTH_MAJOR,
				 get_unaligned_le16(&finger->width));
		input_report_abs(ts_data->input_dev,
				 ABS_MT_WIDTH_MINOR,
				 get_unaligned_le16(&finger->height));
	}
}

static void surface3_spi_process_touch(struct surface3_ts_data *ts_data, u8 *data)
{
	u16 timestamp;
	unsigned int i;
	timestamp = get_unaligned_le16(&data[15]);

	for (i = 0; i < 13; i++) {
		struct surface3_ts_data_finger *finger;

		finger = (struct surface3_ts_data_finger *)&data[17 +
				i * sizeof(struct surface3_ts_data_finger)];

		/*
		 * When bit 5 of status is 1, it marks the end of the report:
		 * - touch present: 0xe7
		 * - touch released: 0xe4
		 * - nothing valuable: 0xff
		 */
		if (finger->status & 0x10)
			break;

		surface3_spi_report_touch(ts_data, finger);
	}

	input_mt_sync_frame(ts_data->input_dev);
	input_sync(ts_data->input_dev);
}

static void surface3_spi_report_pen(struct surface3_ts_data *ts_data,
				    struct surface3_ts_data_pen *pen)
{
	struct input_dev *dev = ts_data->pen_input_dev;
	int st = pen->status;
	int prox = st & 0x01;
	int rubber = st & 0x18;
	int tool = (prox && rubber) ? BTN_TOOL_RUBBER : BTN_TOOL_PEN;

	/* fake proximity out to switch tools */
	if (ts_data->pen_tool != tool) {
		input_report_key(dev, ts_data->pen_tool, 0);
		input_sync(dev);
		ts_data->pen_tool = tool;
	}

	input_report_key(dev, BTN_TOUCH, st & 0x12);

	input_report_key(dev, ts_data->pen_tool, prox);

	if (st) {
		input_report_key(dev,
				 BTN_STYLUS,
				 st & 0x04);

		input_report_abs(dev,
				 ABS_X,
				 get_unaligned_le16(&pen->x));
		input_report_abs(dev,
				 ABS_Y,
				 get_unaligned_le16(&pen->y));
		input_report_abs(dev,
				 ABS_PRESSURE,
				 get_unaligned_le16(&pen->pressure));
	}
}

static void surface3_spi_process_pen(struct surface3_ts_data *ts_data, u8 *data)
{
	struct surface3_ts_data_pen *pen;

	pen = (struct surface3_ts_data_pen *)&data[15];

	surface3_spi_report_pen(ts_data, pen);
	input_sync(ts_data->pen_input_dev);
}

static void surface3_spi_process(struct surface3_ts_data *ts_data)
{
	const char header[] = {
		0xff, 0xff, 0xff, 0xff, 0xa5, 0x5a, 0xe7, 0x7e, 0x01
	};
	u8 *data = ts_data->rd_buf;

	if (memcmp(header, data, sizeof(header)))
		dev_err(&ts_data->spi->dev,
			"%s header error: %*ph, ignoring...\n",
			__func__, (int)sizeof(header), data);

	switch (data[9]) {
	case SURFACE3_REPORT_TOUCH:
		surface3_spi_process_touch(ts_data, data);
		break;
	case SURFACE3_REPORT_PEN:
		surface3_spi_process_pen(ts_data, data);
		break;
	default:
		dev_err(&ts_data->spi->dev,
			"%s unknown packet type: %x, ignoring...\n",
			__func__, data[9]);
		break;
	}
}

static irqreturn_t surface3_spi_irq_handler(int irq, void *dev_id)
{
	struct surface3_ts_data *data = dev_id;

	if (surface3_spi_read(data))
		return IRQ_HANDLED;

	dev_dbg(&data->spi->dev, "%s received -> %*ph\n",
		__func__, SURFACE3_PACKET_SIZE, data->rd_buf);
	surface3_spi_process(data);

	return IRQ_HANDLED;
}

static void surface3_spi_power(struct surface3_ts_data *data, bool on)
{
	gpiod_set_value(data->gpiod_rst[0], on);
	gpiod_set_value(data->gpiod_rst[1], on);
	/* let the device settle a little */
	msleep(20);
}

/**
 * surface3_spi_get_gpio_config - Get GPIO config from ACPI/DT
 *
 * @ts: surface3_spi_ts_data pointer
 */
static int surface3_spi_get_gpio_config(struct surface3_ts_data *data)
{
	int error;
	struct device *dev;
	struct gpio_desc *gpiod;
	int i;

	dev = &data->spi->dev;

	/* Get the reset lines GPIO pin number */
	for (i = 0; i < 2; i++) {
		gpiod = devm_gpiod_get_index(dev, NULL, i, GPIOD_OUT_LOW);
		if (IS_ERR(gpiod)) {
			error = PTR_ERR(gpiod);
			if (error != -EPROBE_DEFER)
				dev_err(dev,
					"Failed to get power GPIO %d: %d\n",
					i,
					error);
			return error;
		}

		data->gpiod_rst[i] = gpiod;
	}

	return 0;
}

static int surface3_spi_create_touch_input(struct surface3_ts_data *data)
{
	struct input_dev *input;
	int error;

	input = devm_input_allocate_device(&data->spi->dev);
	if (!input)
		return -ENOMEM;

	data->input_dev = input;

	input_set_abs_params(input, ABS_MT_POSITION_X, 0, 9600, 0, 0);
	input_abs_set_res(input, ABS_MT_POSITION_X, 40);
	input_set_abs_params(input, ABS_MT_POSITION_Y, 0, 7200, 0, 0);
	input_abs_set_res(input, ABS_MT_POSITION_Y, 48);
	input_set_abs_params(input, ABS_MT_WIDTH_MAJOR, 0, 1024, 0, 0);
	input_set_abs_params(input, ABS_MT_WIDTH_MINOR, 0, 1024, 0, 0);
	input_mt_init_slots(input, 10, INPUT_MT_DIRECT);

	input->name = "Surface3 SPI Capacitive TouchScreen";
	input->phys = "input/ts";
	input->id.bustype = BUS_SPI;
	input->id.vendor = 0x045e;	/* Microsoft */
	input->id.product = 0x0001;
	input->id.version = 0x0000;

	error = input_register_device(input);
	if (error) {
		dev_err(&data->spi->dev,
			"Failed to register input device: %d", error);
		return error;
	}

	return 0;
}

static int surface3_spi_create_pen_input(struct surface3_ts_data *data)
{
	struct input_dev *input;
	int error;

	input = devm_input_allocate_device(&data->spi->dev);
	if (!input)
		return -ENOMEM;

	data->pen_input_dev = input;
	data->pen_tool = BTN_TOOL_PEN;

	__set_bit(INPUT_PROP_DIRECT, input->propbit);
	__set_bit(INPUT_PROP_POINTER, input->propbit);
	input_set_abs_params(input, ABS_X, 0, 9600, 0, 0);
	input_abs_set_res(input, ABS_X, 40);
	input_set_abs_params(input, ABS_Y, 0, 7200, 0, 0);
	input_abs_set_res(input, ABS_Y, 48);
	input_set_abs_params(input, ABS_PRESSURE, 0, 1024, 0, 0);
	input_set_capability(input, EV_KEY, BTN_TOUCH);
	input_set_capability(input, EV_KEY, BTN_STYLUS);
	input_set_capability(input, EV_KEY, BTN_TOOL_PEN);
	input_set_capability(input, EV_KEY, BTN_TOOL_RUBBER);

	input->name = "Surface3 SPI Pen Input";
	input->phys = "input/ts";
	input->id.bustype = BUS_SPI;
	input->id.vendor = 0x045e;     /* Microsoft */
	input->id.product = 0x0002;
	input->id.version = 0x0000;

	error = input_register_device(input);
	if (error) {
		dev_err(&data->spi->dev,
			"Failed to register input device: %d", error);
		return error;
	}

	return 0;
}

static int surface3_spi_probe(struct spi_device *spi)
{
	struct surface3_ts_data *data;
	int error;

	/* Set up SPI*/
	spi->bits_per_word = 8;
	spi->mode = SPI_MODE_0;
	error = spi_setup(spi);
	if (error)
		return error;

	data = devm_kzalloc(&spi->dev, sizeof(*data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	data->spi = spi;
	spi_set_drvdata(spi, data);

	error = surface3_spi_get_gpio_config(data);
	if (error)
		return error;

	surface3_spi_power(data, true);
	surface3_spi_power(data, false);
	surface3_spi_power(data, true);

	error = surface3_spi_create_touch_input(data);
	if (error)
		return error;

	error = surface3_spi_create_pen_input(data);
	if (error)
		return error;

	error = devm_request_threaded_irq(&spi->dev, spi->irq,
					  NULL, surface3_spi_irq_handler,
					  IRQF_ONESHOT,
					  "Surface3-irq", data);
	if (error)
		return error;

	return 0;
}

static int __maybe_unused surface3_spi_suspend(struct device *dev)
{
	struct spi_device *spi = to_spi_device(dev);
	struct surface3_ts_data *data = spi_get_drvdata(spi);

	disable_irq(data->spi->irq);

	surface3_spi_power(data, false);

	return 0;
}

static int __maybe_unused surface3_spi_resume(struct device *dev)
{
	struct spi_device *spi = to_spi_device(dev);
	struct surface3_ts_data *data = spi_get_drvdata(spi);

	surface3_spi_power(data, true);

	enable_irq(data->spi->irq);

	return 0;
}

static SIMPLE_DEV_PM_OPS(surface3_spi_pm_ops,
			 surface3_spi_suspend,
			 surface3_spi_resume);

#ifdef CONFIG_ACPI
static const struct acpi_device_id surface3_spi_acpi_match[] = {
	{ "MSHW0037", 0 },
	{ }
};
MODULE_DEVICE_TABLE(acpi, surface3_spi_acpi_match);
#endif

static struct spi_driver surface3_spi_driver = {
	.driver = {
		.name	= "Surface3-spi",
		.acpi_match_table = ACPI_PTR(surface3_spi_acpi_match),
		.pm = &surface3_spi_pm_ops,
	},
	.probe = surface3_spi_probe,
};

module_spi_driver(surface3_spi_driver);

MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>");
MODULE_DESCRIPTION("Surface 3 SPI touchscreen driver");
MODULE_LICENSE("GPL v2");
Commit	Line	Data
4feacbc2 BT	1	/*
	2	* Driver for Ntrig/Microsoft Touchscreens over SPI
	3	*
	4	* Copyright (c) 2016 Red Hat Inc.
	5	*/
	6
	7	/*
	8	* This program is free software; you can redistribute it and/or modify it
	9	* under the terms of the GNU General Public License as published by the Free
	10	* Software Foundation; version 2 of the License.
	11	*/
	12
	13	#include <linux/kernel.h>
	14
	15	#include <linux/delay.h>
	16	#include <linux/gpio/consumer.h>
	17	#include <linux/input.h>
	18	#include <linux/input/mt.h>
	19	#include <linux/interrupt.h>
	20	#include <linux/module.h>
	21	#include <linux/slab.h>
	22	#include <linux/spi/spi.h>
	23	#include <linux/acpi.h>
	24
	25	#include <asm/unaligned.h>
	26
	27	#define SURFACE3_PACKET_SIZE 264
	28
427ee206	29	#define SURFACE3_REPORT_TOUCH 0xd2
72fb4765	30	#define SURFACE3_REPORT_PEN 0x16
427ee206	31
4feacbc2 BT	32	struct surface3_ts_data {
	33	struct spi_device *spi;
	34	struct gpio_desc *gpiod_rst[2];
	35	struct input_dev *input_dev;
72fb4765 SJ	36	struct input_dev *pen_input_dev;
72fb4765 SJ	37	int pen_tool;
4feacbc2 BT	38
	39	u8 rd_buf[SURFACE3_PACKET_SIZE] ____cacheline_aligned;
	40	};
	41
	42	struct surface3_ts_data_finger {
	43	u8 status;
	44	__le16 tracking_id;
	45	__le16 x;
	46	__le16 cx;
	47	__le16 y;
	48	__le16 cy;
	49	__le16 width;
	50	__le16 height;
	51	u32 padding;
	52	} __packed;
	53
72fb4765 SJ	54	struct surface3_ts_data_pen {
	55	u8 status;
	56	__le16 x;
	57	__le16 y;
	58	__le16 pressure;
	59	u8 padding;
	60	} __packed;
	61
4feacbc2 BT	62	static int surface3_spi_read(struct surface3_ts_data *ts_data)
	63	{
	64	struct spi_device *spi = ts_data->spi;
	65
	66	memset(ts_data->rd_buf, 0, sizeof(ts_data->rd_buf));
	67	return spi_read(spi, ts_data->rd_buf, sizeof(ts_data->rd_buf));
	68	}
	69
	70	static void surface3_spi_report_touch(struct surface3_ts_data *ts_data,
	71	struct surface3_ts_data_finger *finger)
	72	{
	73	int st = finger->status & 0x01;
	74	int slot;
	75
	76	slot = input_mt_get_slot_by_key(ts_data->input_dev,
	77	get_unaligned_le16(&finger->tracking_id));
	78	if (slot < 0)
	79	return;
	80
	81	input_mt_slot(ts_data->input_dev, slot);
	82	input_mt_report_slot_state(ts_data->input_dev, MT_TOOL_FINGER, st);
	83	if (st) {
	84	input_report_abs(ts_data->input_dev,
	85	ABS_MT_POSITION_X,
	86	get_unaligned_le16(&finger->x));
	87	input_report_abs(ts_data->input_dev,
	88	ABS_MT_POSITION_Y,
	89	get_unaligned_le16(&finger->y));
	90	input_report_abs(ts_data->input_dev,
	91	ABS_MT_WIDTH_MAJOR,
	92	get_unaligned_le16(&finger->width));
	93	input_report_abs(ts_data->input_dev,
	94	ABS_MT_WIDTH_MINOR,
	95	get_unaligned_le16(&finger->height));
	96	}
	97	}
	98
427ee206	99	static void surface3_spi_process_touch(struct surface3_ts_data ts_data, u8 data)
4feacbc2	100	{
4feacbc2 BT	101	u16 timestamp;
4feacbc2 BT	102	unsigned int i;
4feacbc2 BT	103	timestamp = get_unaligned_le16(&data[15]);
	104
	105	for (i = 0; i < 13; i++) {
	106	struct surface3_ts_data_finger *finger;
	107
	108	finger = (struct surface3_ts_data_finger *)&data[17 +
	109	i * sizeof(struct surface3_ts_data_finger)];
	110
	111	/*
	112	* When bit 5 of status is 1, it marks the end of the report:
	113	* - touch present: 0xe7
	114	* - touch released: 0xe4
	115	* - nothing valuable: 0xff
	116	*/
	117	if (finger->status & 0x10)
	118	break;
	119
	120	surface3_spi_report_touch(ts_data, finger);
	121	}
	122
	123	input_mt_sync_frame(ts_data->input_dev);
	124	input_sync(ts_data->input_dev);
	125	}
	126
72fb4765 SJ	127	static void surface3_spi_report_pen(struct surface3_ts_data *ts_data,
	128	struct surface3_ts_data_pen *pen)
	129	{
	130	struct input_dev *dev = ts_data->pen_input_dev;
	131	int st = pen->status;
	132	int prox = st & 0x01;
	133	int rubber = st & 0x18;
	134	int tool = (prox && rubber) ? BTN_TOOL_RUBBER : BTN_TOOL_PEN;
	135
	136	/* fake proximity out to switch tools */
	137	if (ts_data->pen_tool != tool) {
	138	input_report_key(dev, ts_data->pen_tool, 0);
	139	input_sync(dev);
	140	ts_data->pen_tool = tool;
	141	}
	142
	143	input_report_key(dev, BTN_TOUCH, st & 0x12);
	144
	145	input_report_key(dev, ts_data->pen_tool, prox);
	146
	147	if (st) {
	148	input_report_key(dev,
	149	BTN_STYLUS,
	150	st & 0x04);
	151
	152	input_report_abs(dev,
	153	ABS_X,
	154	get_unaligned_le16(&pen->x));
	155	input_report_abs(dev,
	156	ABS_Y,
	157	get_unaligned_le16(&pen->y));
	158	input_report_abs(dev,
	159	ABS_PRESSURE,
	160	get_unaligned_le16(&pen->pressure));
	161	}
	162	}
	163
	164	static void surface3_spi_process_pen(struct surface3_ts_data ts_data, u8 data)
	165	{
	166	struct surface3_ts_data_pen *pen;
	167
	168	pen = (struct surface3_ts_data_pen *)&data[15];
	169
	170	surface3_spi_report_pen(ts_data, pen);
	171	input_sync(ts_data->pen_input_dev);
	172	}
	173
427ee206 SJ	174	static void surface3_spi_process(struct surface3_ts_data *ts_data)
	175	{
	176	const char header[] = {
	177	0xff, 0xff, 0xff, 0xff, 0xa5, 0x5a, 0xe7, 0x7e, 0x01
	178	};
	179	u8 *data = ts_data->rd_buf;
	180
	181	if (memcmp(header, data, sizeof(header)))
	182	dev_err(&ts_data->spi->dev,
	183	"%s header error: %*ph, ignoring...\n",
	184	__func__, (int)sizeof(header), data);
	185
72fb4765 SJ	186	switch (data[9]) {
72fb4765 SJ	187	case SURFACE3_REPORT_TOUCH:
427ee206	188	surface3_spi_process_touch(ts_data, data);
72fb4765 SJ	189	break;
	190	case SURFACE3_REPORT_PEN:
	191	surface3_spi_process_pen(ts_data, data);
	192	break;
	193	default:
427ee206 SJ	194	dev_err(&ts_data->spi->dev,
	195	"%s unknown packet type: %x, ignoring...\n",
	196	__func__, data[9]);
72fb4765 SJ	197	break;
72fb4765 SJ	198	}
427ee206 SJ	199	}
427ee206 SJ	200
4feacbc2 BT	201	static irqreturn_t surface3_spi_irq_handler(int irq, void *dev_id)
	202	{
	203	struct surface3_ts_data *data = dev_id;
	204
	205	if (surface3_spi_read(data))
	206	return IRQ_HANDLED;
	207
	208	dev_dbg(&data->spi->dev, "%s received -> %*ph\n",
	209	__func__, SURFACE3_PACKET_SIZE, data->rd_buf);
	210	surface3_spi_process(data);
	211
	212	return IRQ_HANDLED;
	213	}
	214
	215	static void surface3_spi_power(struct surface3_ts_data *data, bool on)
	216	{
	217	gpiod_set_value(data->gpiod_rst[0], on);
	218	gpiod_set_value(data->gpiod_rst[1], on);
	219	/* let the device settle a little */
	220	msleep(20);
	221	}
	222
	223	/**
	224	* surface3_spi_get_gpio_config - Get GPIO config from ACPI/DT
	225	*
	226	* @ts: surface3_spi_ts_data pointer
	227	*/
	228	static int surface3_spi_get_gpio_config(struct surface3_ts_data *data)
	229	{
	230	int error;
	231	struct device *dev;
	232	struct gpio_desc *gpiod;
	233	int i;
	234
	235	dev = &data->spi->dev;
	236
	237	/* Get the reset lines GPIO pin number */
	238	for (i = 0; i < 2; i++) {
	239	gpiod = devm_gpiod_get_index(dev, NULL, i, GPIOD_OUT_LOW);
	240	if (IS_ERR(gpiod)) {
	241	error = PTR_ERR(gpiod);
	242	if (error != -EPROBE_DEFER)
	243	dev_err(dev,
	244	"Failed to get power GPIO %d: %d\n",
	245	i,
	246	error);
	247	return error;
	248	}
	249
	250	data->gpiod_rst[i] = gpiod;
	251	}
	252
	253	return 0;
	254	}
	255
427ee206	256	static int surface3_spi_create_touch_input(struct surface3_ts_data *data)
4feacbc2 BT	257	{
	258	struct input_dev *input;
	259	int error;
	260
	261	input = devm_input_allocate_device(&data->spi->dev);
	262	if (!input)
	263	return -ENOMEM;
	264
	265	data->input_dev = input;
	266
	267	input_set_abs_params(input, ABS_MT_POSITION_X, 0, 9600, 0, 0);
	268	input_abs_set_res(input, ABS_MT_POSITION_X, 40);
	269	input_set_abs_params(input, ABS_MT_POSITION_Y, 0, 7200, 0, 0);
	270	input_abs_set_res(input, ABS_MT_POSITION_Y, 48);
	271	input_set_abs_params(input, ABS_MT_WIDTH_MAJOR, 0, 1024, 0, 0);
	272	input_set_abs_params(input, ABS_MT_WIDTH_MINOR, 0, 1024, 0, 0);
	273	input_mt_init_slots(input, 10, INPUT_MT_DIRECT);
	274
	275	input->name = "Surface3 SPI Capacitive TouchScreen";
	276	input->phys = "input/ts";
	277	input->id.bustype = BUS_SPI;
	278	input->id.vendor = 0x045e; /* Microsoft */
427ee206	279	input->id.product = 0x0001;
4feacbc2 BT	280	input->id.version = 0x0000;
	281
	282	error = input_register_device(input);
	283	if (error) {
	284	dev_err(&data->spi->dev,
	285	"Failed to register input device: %d", error);
	286	return error;
	287	}
	288
	289	return 0;
	290	}
	291
72fb4765 SJ	292	static int surface3_spi_create_pen_input(struct surface3_ts_data *data)
	293	{
	294	struct input_dev *input;
	295	int error;
	296
	297	input = devm_input_allocate_device(&data->spi->dev);
	298	if (!input)
	299	return -ENOMEM;
	300
	301	data->pen_input_dev = input;
	302	data->pen_tool = BTN_TOOL_PEN;
	303
	304	__set_bit(INPUT_PROP_DIRECT, input->propbit);
	305	__set_bit(INPUT_PROP_POINTER, input->propbit);
	306	input_set_abs_params(input, ABS_X, 0, 9600, 0, 0);
	307	input_abs_set_res(input, ABS_X, 40);
	308	input_set_abs_params(input, ABS_Y, 0, 7200, 0, 0);
	309	input_abs_set_res(input, ABS_Y, 48);
	310	input_set_abs_params(input, ABS_PRESSURE, 0, 1024, 0, 0);
	311	input_set_capability(input, EV_KEY, BTN_TOUCH);
	312	input_set_capability(input, EV_KEY, BTN_STYLUS);
	313	input_set_capability(input, EV_KEY, BTN_TOOL_PEN);
	314	input_set_capability(input, EV_KEY, BTN_TOOL_RUBBER);
	315
	316	input->name = "Surface3 SPI Pen Input";
	317	input->phys = "input/ts";
	318	input->id.bustype = BUS_SPI;
	319	input->id.vendor = 0x045e; /* Microsoft */
	320	input->id.product = 0x0002;
	321	input->id.version = 0x0000;
	322
	323	error = input_register_device(input);
	324	if (error) {
	325	dev_err(&data->spi->dev,
	326	"Failed to register input device: %d", error);
	327	return error;
	328	}
	329
	330	return 0;
	331	}
	332
4feacbc2 BT	333	static int surface3_spi_probe(struct spi_device *spi)
	334	{
	335	struct surface3_ts_data *data;
	336	int error;
	337
	338	/* Set up SPI*/
	339	spi->bits_per_word = 8;
	340	spi->mode = SPI_MODE_0;
	341	error = spi_setup(spi);
	342	if (error)
	343	return error;
	344
	345	data = devm_kzalloc(&spi->dev, sizeof(*data), GFP_KERNEL);
	346	if (!data)
	347	return -ENOMEM;
	348
	349	data->spi = spi;
	350	spi_set_drvdata(spi, data);
	351
	352	error = surface3_spi_get_gpio_config(data);
	353	if (error)
	354	return error;
	355
	356	surface3_spi_power(data, true);
	357	surface3_spi_power(data, false);
	358	surface3_spi_power(data, true);
	359
427ee206	360	error = surface3_spi_create_touch_input(data);
4feacbc2 BT	361	if (error)
	362	return error;
	363
72fb4765 SJ	364	error = surface3_spi_create_pen_input(data);
	365	if (error)
	366	return error;
	367
4feacbc2 BT	368	error = devm_request_threaded_irq(&spi->dev, spi->irq,
	369	NULL, surface3_spi_irq_handler,
	370	IRQF_ONESHOT,
	371	"Surface3-irq", data);
	372	if (error)
	373	return error;
	374
	375	return 0;
	376	}
	377
	378	static int __maybe_unused surface3_spi_suspend(struct device *dev)
	379	{
	380	struct spi_device *spi = to_spi_device(dev);
	381	struct surface3_ts_data *data = spi_get_drvdata(spi);
	382
	383	disable_irq(data->spi->irq);
	384
	385	surface3_spi_power(data, false);
	386
	387	return 0;
	388	}
	389
	390	static int __maybe_unused surface3_spi_resume(struct device *dev)
	391	{
	392	struct spi_device *spi = to_spi_device(dev);
	393	struct surface3_ts_data *data = spi_get_drvdata(spi);
	394
	395	surface3_spi_power(data, true);
	396
	397	enable_irq(data->spi->irq);
	398
	399	return 0;
	400	}
	401
	402	static SIMPLE_DEV_PM_OPS(surface3_spi_pm_ops,
	403	surface3_spi_suspend,
	404	surface3_spi_resume);
	405
	406	#ifdef CONFIG_ACPI
	407	static const struct acpi_device_id surface3_spi_acpi_match[] = {
	408	{ "MSHW0037", 0 },
	409	{ }
	410	};
	411	MODULE_DEVICE_TABLE(acpi, surface3_spi_acpi_match);
	412	#endif
	413
	414	static struct spi_driver surface3_spi_driver = {
	415	.driver = {
	416	.name = "Surface3-spi",
	417	.acpi_match_table = ACPI_PTR(surface3_spi_acpi_match),
	418	.pm = &surface3_spi_pm_ops,
	419	},
	420	.probe = surface3_spi_probe,
	421	};
	422
	423	module_spi_driver(surface3_spi_driver);
	424
	425	MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>");
	426	MODULE_DESCRIPTION("Surface 3 SPI touchscreen driver");
	427	MODULE_LICENSE("GPL v2");