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

// SPDX-License-Identifier: GPL-2.0-only
/*
 *  Driver for Ntrig/Microsoft Touchscreens over SPI
 *
 *  Copyright (c) 2016 Red Hat Inc.
 */


#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)
{
	unsigned int i;

	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)
{
	static 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
 *
 * @data: 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 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 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 DEFINE_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 = pm_sleep_ptr(&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
b886d83c	1	// SPDX-License-Identifier: GPL-2.0-only
4feacbc2 BT	2	/*
	3	* Driver for Ntrig/Microsoft Touchscreens over SPI
	4	*
	5	* Copyright (c) 2016 Red Hat Inc.
	6	*/
	7
4feacbc2 BT	8
	9	#include <linux/kernel.h>
	10
	11	#include <linux/delay.h>
	12	#include <linux/gpio/consumer.h>
	13	#include <linux/input.h>
	14	#include <linux/input/mt.h>
	15	#include <linux/interrupt.h>
	16	#include <linux/module.h>
	17	#include <linux/slab.h>
	18	#include <linux/spi/spi.h>
	19	#include <linux/acpi.h>
	20
	21	#include <asm/unaligned.h>
	22
	23	#define SURFACE3_PACKET_SIZE 264
	24
427ee206	25	#define SURFACE3_REPORT_TOUCH 0xd2
72fb4765	26	#define SURFACE3_REPORT_PEN 0x16
427ee206	27
4feacbc2 BT	28	struct surface3_ts_data {
	29	struct spi_device *spi;
	30	struct gpio_desc *gpiod_rst[2];
	31	struct input_dev *input_dev;
72fb4765 SJ	32	struct input_dev *pen_input_dev;
72fb4765 SJ	33	int pen_tool;
4feacbc2 BT	34
	35	u8 rd_buf[SURFACE3_PACKET_SIZE] ____cacheline_aligned;
	36	};
	37
	38	struct surface3_ts_data_finger {
	39	u8 status;
	40	__le16 tracking_id;
	41	__le16 x;
	42	__le16 cx;
	43	__le16 y;
	44	__le16 cy;
	45	__le16 width;
	46	__le16 height;
	47	u32 padding;
	48	} __packed;
	49
72fb4765 SJ	50	struct surface3_ts_data_pen {
	51	u8 status;
	52	__le16 x;
	53	__le16 y;
	54	__le16 pressure;
	55	u8 padding;
	56	} __packed;
	57
4feacbc2 BT	58	static int surface3_spi_read(struct surface3_ts_data *ts_data)
	59	{
	60	struct spi_device *spi = ts_data->spi;
	61
	62	memset(ts_data->rd_buf, 0, sizeof(ts_data->rd_buf));
	63	return spi_read(spi, ts_data->rd_buf, sizeof(ts_data->rd_buf));
	64	}
	65
	66	static void surface3_spi_report_touch(struct surface3_ts_data *ts_data,
	67	struct surface3_ts_data_finger *finger)
	68	{
	69	int st = finger->status & 0x01;
	70	int slot;
	71
	72	slot = input_mt_get_slot_by_key(ts_data->input_dev,
	73	get_unaligned_le16(&finger->tracking_id));
	74	if (slot < 0)
	75	return;
	76
	77	input_mt_slot(ts_data->input_dev, slot);
	78	input_mt_report_slot_state(ts_data->input_dev, MT_TOOL_FINGER, st);
	79	if (st) {
	80	input_report_abs(ts_data->input_dev,
	81	ABS_MT_POSITION_X,
	82	get_unaligned_le16(&finger->x));
	83	input_report_abs(ts_data->input_dev,
	84	ABS_MT_POSITION_Y,
	85	get_unaligned_le16(&finger->y));
	86	input_report_abs(ts_data->input_dev,
	87	ABS_MT_WIDTH_MAJOR,
	88	get_unaligned_le16(&finger->width));
	89	input_report_abs(ts_data->input_dev,
	90	ABS_MT_WIDTH_MINOR,
	91	get_unaligned_le16(&finger->height));
	92	}
	93	}
	94
427ee206	95	static void surface3_spi_process_touch(struct surface3_ts_data ts_data, u8 data)
4feacbc2	96	{
4feacbc2	97	unsigned int i;
4feacbc2 BT	98
	99	for (i = 0; i < 13; i++) {
	100	struct surface3_ts_data_finger *finger;
	101
	102	finger = (struct surface3_ts_data_finger *)&data[17 +
	103	i * sizeof(struct surface3_ts_data_finger)];
	104
	105	/*
	106	* When bit 5 of status is 1, it marks the end of the report:
	107	* - touch present: 0xe7
	108	* - touch released: 0xe4
	109	* - nothing valuable: 0xff
	110	*/
	111	if (finger->status & 0x10)
	112	break;
	113
	114	surface3_spi_report_touch(ts_data, finger);
	115	}
	116
	117	input_mt_sync_frame(ts_data->input_dev);
	118	input_sync(ts_data->input_dev);
	119	}
	120
72fb4765 SJ	121	static void surface3_spi_report_pen(struct surface3_ts_data *ts_data,
	122	struct surface3_ts_data_pen *pen)
	123	{
	124	struct input_dev *dev = ts_data->pen_input_dev;
	125	int st = pen->status;
	126	int prox = st & 0x01;
	127	int rubber = st & 0x18;
	128	int tool = (prox && rubber) ? BTN_TOOL_RUBBER : BTN_TOOL_PEN;
	129
	130	/* fake proximity out to switch tools */
	131	if (ts_data->pen_tool != tool) {
	132	input_report_key(dev, ts_data->pen_tool, 0);
	133	input_sync(dev);
	134	ts_data->pen_tool = tool;
	135	}
	136
	137	input_report_key(dev, BTN_TOUCH, st & 0x12);
	138
	139	input_report_key(dev, ts_data->pen_tool, prox);
	140
	141	if (st) {
	142	input_report_key(dev,
	143	BTN_STYLUS,
	144	st & 0x04);
	145
	146	input_report_abs(dev,
	147	ABS_X,
	148	get_unaligned_le16(&pen->x));
	149	input_report_abs(dev,
	150	ABS_Y,
	151	get_unaligned_le16(&pen->y));
	152	input_report_abs(dev,
	153	ABS_PRESSURE,
	154	get_unaligned_le16(&pen->pressure));
	155	}
	156	}
	157
	158	static void surface3_spi_process_pen(struct surface3_ts_data ts_data, u8 data)
	159	{
	160	struct surface3_ts_data_pen *pen;
	161
	162	pen = (struct surface3_ts_data_pen *)&data[15];
	163
	164	surface3_spi_report_pen(ts_data, pen);
	165	input_sync(ts_data->pen_input_dev);
	166	}
	167
427ee206 SJ	168	static void surface3_spi_process(struct surface3_ts_data *ts_data)
427ee206 SJ	169	{
023c437a	170	static const char header[] = {
427ee206 SJ	171	0xff, 0xff, 0xff, 0xff, 0xa5, 0x5a, 0xe7, 0x7e, 0x01
	172	};
	173	u8 *data = ts_data->rd_buf;
	174
	175	if (memcmp(header, data, sizeof(header)))
	176	dev_err(&ts_data->spi->dev,
	177	"%s header error: %*ph, ignoring...\n",
	178	__func__, (int)sizeof(header), data);
	179
72fb4765 SJ	180	switch (data[9]) {
72fb4765 SJ	181	case SURFACE3_REPORT_TOUCH:
427ee206	182	surface3_spi_process_touch(ts_data, data);
72fb4765 SJ	183	break;
	184	case SURFACE3_REPORT_PEN:
	185	surface3_spi_process_pen(ts_data, data);
	186	break;
	187	default:
427ee206 SJ	188	dev_err(&ts_data->spi->dev,
	189	"%s unknown packet type: %x, ignoring...\n",
	190	__func__, data[9]);
72fb4765 SJ	191	break;
72fb4765 SJ	192	}
427ee206 SJ	193	}
427ee206 SJ	194
4feacbc2 BT	195	static irqreturn_t surface3_spi_irq_handler(int irq, void *dev_id)
	196	{
	197	struct surface3_ts_data *data = dev_id;
	198
	199	if (surface3_spi_read(data))
	200	return IRQ_HANDLED;
	201
	202	dev_dbg(&data->spi->dev, "%s received -> %*ph\n",
	203	__func__, SURFACE3_PACKET_SIZE, data->rd_buf);
	204	surface3_spi_process(data);
	205
	206	return IRQ_HANDLED;
	207	}
	208
	209	static void surface3_spi_power(struct surface3_ts_data *data, bool on)
	210	{
	211	gpiod_set_value(data->gpiod_rst[0], on);
	212	gpiod_set_value(data->gpiod_rst[1], on);
	213	/* let the device settle a little */
	214	msleep(20);
	215	}
	216
	217	/**
	218	* surface3_spi_get_gpio_config - Get GPIO config from ACPI/DT
	219	*
aea1f3ff	220	* @data: surface3_spi_ts_data pointer
4feacbc2 BT	221	*/
	222	static int surface3_spi_get_gpio_config(struct surface3_ts_data *data)
	223	{
	224	int error;
	225	struct device *dev;
	226	struct gpio_desc *gpiod;
	227	int i;
	228
	229	dev = &data->spi->dev;
	230
	231	/* Get the reset lines GPIO pin number */
	232	for (i = 0; i < 2; i++) {
	233	gpiod = devm_gpiod_get_index(dev, NULL, i, GPIOD_OUT_LOW);
	234	if (IS_ERR(gpiod)) {
	235	error = PTR_ERR(gpiod);
	236	if (error != -EPROBE_DEFER)
	237	dev_err(dev,
	238	"Failed to get power GPIO %d: %d\n",
	239	i,
	240	error);
	241	return error;
	242	}
	243
	244	data->gpiod_rst[i] = gpiod;
	245	}
	246
	247	return 0;
	248	}
	249
427ee206	250	static int surface3_spi_create_touch_input(struct surface3_ts_data *data)
4feacbc2 BT	251	{
	252	struct input_dev *input;
	253	int error;
	254
	255	input = devm_input_allocate_device(&data->spi->dev);
	256	if (!input)
	257	return -ENOMEM;
	258
	259	data->input_dev = input;
	260
	261	input_set_abs_params(input, ABS_MT_POSITION_X, 0, 9600, 0, 0);
	262	input_abs_set_res(input, ABS_MT_POSITION_X, 40);
	263	input_set_abs_params(input, ABS_MT_POSITION_Y, 0, 7200, 0, 0);
	264	input_abs_set_res(input, ABS_MT_POSITION_Y, 48);
	265	input_set_abs_params(input, ABS_MT_WIDTH_MAJOR, 0, 1024, 0, 0);
	266	input_set_abs_params(input, ABS_MT_WIDTH_MINOR, 0, 1024, 0, 0);
	267	input_mt_init_slots(input, 10, INPUT_MT_DIRECT);
	268
	269	input->name = "Surface3 SPI Capacitive TouchScreen";
	270	input->phys = "input/ts";
	271	input->id.bustype = BUS_SPI;
	272	input->id.vendor = 0x045e; /* Microsoft */
427ee206	273	input->id.product = 0x0001;
4feacbc2 BT	274	input->id.version = 0x0000;
	275
	276	error = input_register_device(input);
	277	if (error) {
	278	dev_err(&data->spi->dev,
	279	"Failed to register input device: %d", error);
	280	return error;
	281	}
	282
	283	return 0;
	284	}
	285
72fb4765 SJ	286	static int surface3_spi_create_pen_input(struct surface3_ts_data *data)
	287	{
	288	struct input_dev *input;
	289	int error;
	290
	291	input = devm_input_allocate_device(&data->spi->dev);
	292	if (!input)
	293	return -ENOMEM;
	294
	295	data->pen_input_dev = input;
	296	data->pen_tool = BTN_TOOL_PEN;
	297
	298	__set_bit(INPUT_PROP_DIRECT, input->propbit);
	299	__set_bit(INPUT_PROP_POINTER, input->propbit);
	300	input_set_abs_params(input, ABS_X, 0, 9600, 0, 0);
	301	input_abs_set_res(input, ABS_X, 40);
	302	input_set_abs_params(input, ABS_Y, 0, 7200, 0, 0);
	303	input_abs_set_res(input, ABS_Y, 48);
	304	input_set_abs_params(input, ABS_PRESSURE, 0, 1024, 0, 0);
	305	input_set_capability(input, EV_KEY, BTN_TOUCH);
	306	input_set_capability(input, EV_KEY, BTN_STYLUS);
	307	input_set_capability(input, EV_KEY, BTN_TOOL_PEN);
	308	input_set_capability(input, EV_KEY, BTN_TOOL_RUBBER);
	309
	310	input->name = "Surface3 SPI Pen Input";
	311	input->phys = "input/ts";
	312	input->id.bustype = BUS_SPI;
	313	input->id.vendor = 0x045e; /* Microsoft */
	314	input->id.product = 0x0002;
	315	input->id.version = 0x0000;
	316
	317	error = input_register_device(input);
	318	if (error) {
	319	dev_err(&data->spi->dev,
	320	"Failed to register input device: %d", error);
	321	return error;
	322	}
	323
	324	return 0;
	325	}
	326
4feacbc2 BT	327	static int surface3_spi_probe(struct spi_device *spi)
	328	{
	329	struct surface3_ts_data *data;
	330	int error;
	331
	332	/* Set up SPI*/
	333	spi->bits_per_word = 8;
	334	spi->mode = SPI_MODE_0;
	335	error = spi_setup(spi);
	336	if (error)
	337	return error;
	338
	339	data = devm_kzalloc(&spi->dev, sizeof(*data), GFP_KERNEL);
	340	if (!data)
	341	return -ENOMEM;
	342
	343	data->spi = spi;
	344	spi_set_drvdata(spi, data);
	345
	346	error = surface3_spi_get_gpio_config(data);
	347	if (error)
	348	return error;
	349
	350	surface3_spi_power(data, true);
	351	surface3_spi_power(data, false);
	352	surface3_spi_power(data, true);
	353
427ee206	354	error = surface3_spi_create_touch_input(data);
4feacbc2 BT	355	if (error)
	356	return error;
	357
72fb4765 SJ	358	error = surface3_spi_create_pen_input(data);
	359	if (error)
	360	return error;
	361
4feacbc2 BT	362	error = devm_request_threaded_irq(&spi->dev, spi->irq,
	363	NULL, surface3_spi_irq_handler,
	364	IRQF_ONESHOT,
	365	"Surface3-irq", data);
	366	if (error)
	367	return error;
	368
	369	return 0;
	370	}
	371
ea476f51	372	static int surface3_spi_suspend(struct device *dev)
4feacbc2 BT	373	{
	374	struct spi_device *spi = to_spi_device(dev);
	375	struct surface3_ts_data *data = spi_get_drvdata(spi);
	376
	377	disable_irq(data->spi->irq);
	378
	379	surface3_spi_power(data, false);
	380
	381	return 0;
	382	}
	383
ea476f51	384	static int surface3_spi_resume(struct device *dev)
4feacbc2 BT	385	{
	386	struct spi_device *spi = to_spi_device(dev);
	387	struct surface3_ts_data *data = spi_get_drvdata(spi);
	388
	389	surface3_spi_power(data, true);
	390
	391	enable_irq(data->spi->irq);
	392
	393	return 0;
	394	}
	395
ea476f51 JC	396	static DEFINE_SIMPLE_DEV_PM_OPS(surface3_spi_pm_ops,
	397	surface3_spi_suspend,
	398	surface3_spi_resume);
4feacbc2 BT	399
	400	#ifdef CONFIG_ACPI
	401	static const struct acpi_device_id surface3_spi_acpi_match[] = {
	402	{ "MSHW0037", 0 },
	403	{ }
	404	};
	405	MODULE_DEVICE_TABLE(acpi, surface3_spi_acpi_match);
	406	#endif
	407
	408	static struct spi_driver surface3_spi_driver = {
	409	.driver = {
	410	.name = "Surface3-spi",
	411	.acpi_match_table = ACPI_PTR(surface3_spi_acpi_match),
ea476f51	412	.pm = pm_sleep_ptr(&surface3_spi_pm_ops),
4feacbc2 BT	413	},
	414	.probe = surface3_spi_probe,
	415	};
	416
	417	module_spi_driver(surface3_spi_driver);
	418
	419	MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>");
	420	MODULE_DESCRIPTION("Surface 3 SPI touchscreen driver");
	421	MODULE_LICENSE("GPL v2");