1// SPDX-License-Identifier: GPL-2.0-or-later
  2/* -------------------------------------------------------------------------
  3 * Copyright (C) 2014-2015, Intel Corporation
  4 *
  5 * Derived from:
  6 *  gslX68X.c
  7 *  Copyright (C) 2010-2015, Shanghai Sileadinc Co.Ltd
  8 *
 
 
 
 
 
 
 
 
 
  9 * -------------------------------------------------------------------------
 10 */
 11
 12#include <linux/i2c.h>
 13#include <linux/module.h>
 14#include <linux/acpi.h>
 15#include <linux/interrupt.h>
 16#include <linux/gpio/consumer.h>
 17#include <linux/delay.h>
 18#include <linux/firmware.h>
 19#include <linux/input.h>
 20#include <linux/input/mt.h>
 21#include <linux/input/touchscreen.h>
 22#include <linux/pm.h>
 23#include <linux/pm_runtime.h>
 24#include <linux/irq.h>
 25#include <linux/regulator/consumer.h>
 26
 27#include <asm/unaligned.h>
 28
 29#define SILEAD_TS_NAME		"silead_ts"
 30
 31#define SILEAD_REG_RESET	0xE0
 32#define SILEAD_REG_DATA		0x80
 33#define SILEAD_REG_TOUCH_NR	0x80
 34#define SILEAD_REG_POWER	0xBC
 35#define SILEAD_REG_CLOCK	0xE4
 36#define SILEAD_REG_STATUS	0xB0
 37#define SILEAD_REG_ID		0xFC
 38#define SILEAD_REG_MEM_CHECK	0xB0
 39
 40#define SILEAD_STATUS_OK	0x5A5A5A5A
 41#define SILEAD_TS_DATA_LEN	44
 42#define SILEAD_CLOCK		0x04
 43
 44#define SILEAD_CMD_RESET	0x88
 45#define SILEAD_CMD_START	0x00
 46
 47#define SILEAD_POINT_DATA_LEN	0x04
 48#define SILEAD_POINT_Y_OFF      0x00
 49#define SILEAD_POINT_Y_MSB_OFF	0x01
 50#define SILEAD_POINT_X_OFF	0x02
 51#define SILEAD_POINT_X_MSB_OFF	0x03
 52#define SILEAD_EXTRA_DATA_MASK	0xF0
 53
 54#define SILEAD_CMD_SLEEP_MIN	10000
 55#define SILEAD_CMD_SLEEP_MAX	20000
 56#define SILEAD_POWER_SLEEP	20
 57#define SILEAD_STARTUP_SLEEP	30
 58
 59#define SILEAD_MAX_FINGERS	10
 60
 61enum silead_ts_power {
 62	SILEAD_POWER_ON  = 1,
 63	SILEAD_POWER_OFF = 0
 64};
 65
 66struct silead_ts_data {
 67	struct i2c_client *client;
 68	struct gpio_desc *gpio_power;
 69	struct input_dev *input;
 70	struct input_dev *pen_input;
 71	struct regulator_bulk_data regulators[2];
 72	char fw_name[64];
 73	struct touchscreen_properties prop;
 74	u32 max_fingers;
 75	u32 chip_id;
 76	struct input_mt_pos pos[SILEAD_MAX_FINGERS];
 77	int slots[SILEAD_MAX_FINGERS];
 78	int id[SILEAD_MAX_FINGERS];
 79	u32 efi_fw_min_max[4];
 80	bool efi_fw_min_max_set;
 81	bool pen_supported;
 82	bool pen_down;
 83	u32 pen_x_res;
 84	u32 pen_y_res;
 85	int pen_up_count;
 86};
 87
 88struct silead_fw_data {
 89	u32 offset;
 90	u32 val;
 91};
 92
 93static void silead_apply_efi_fw_min_max(struct silead_ts_data *data)
 94{
 95	struct input_absinfo *absinfo_x = &data->input->absinfo[ABS_MT_POSITION_X];
 96	struct input_absinfo *absinfo_y = &data->input->absinfo[ABS_MT_POSITION_Y];
 97
 98	if (!data->efi_fw_min_max_set)
 99		return;
100
101	absinfo_x->minimum = data->efi_fw_min_max[0];
102	absinfo_x->maximum = data->efi_fw_min_max[1];
103	absinfo_y->minimum = data->efi_fw_min_max[2];
104	absinfo_y->maximum = data->efi_fw_min_max[3];
105
106	if (data->prop.invert_x) {
107		absinfo_x->maximum -= absinfo_x->minimum;
108		absinfo_x->minimum = 0;
109	}
110
111	if (data->prop.invert_y) {
112		absinfo_y->maximum -= absinfo_y->minimum;
113		absinfo_y->minimum = 0;
114	}
115
116	if (data->prop.swap_x_y) {
117		swap(absinfo_x->minimum, absinfo_y->minimum);
118		swap(absinfo_x->maximum, absinfo_y->maximum);
119	}
120}
121
122static int silead_ts_request_input_dev(struct silead_ts_data *data)
123{
124	struct device *dev = &data->client->dev;
125	int error;
126
127	data->input = devm_input_allocate_device(dev);
128	if (!data->input) {
129		dev_err(dev,
130			"Failed to allocate input device\n");
131		return -ENOMEM;
132	}
133
134	input_set_abs_params(data->input, ABS_MT_POSITION_X, 0, 4095, 0, 0);
135	input_set_abs_params(data->input, ABS_MT_POSITION_Y, 0, 4095, 0, 0);
136	touchscreen_parse_properties(data->input, true, &data->prop);
137	silead_apply_efi_fw_min_max(data);
138
139	input_mt_init_slots(data->input, data->max_fingers,
140			    INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED |
141			    INPUT_MT_TRACK);
142
143	if (device_property_read_bool(dev, "silead,home-button"))
144		input_set_capability(data->input, EV_KEY, KEY_LEFTMETA);
145
146	data->input->name = SILEAD_TS_NAME;
147	data->input->phys = "input/ts";
148	data->input->id.bustype = BUS_I2C;
149
150	error = input_register_device(data->input);
151	if (error) {
152		dev_err(dev, "Failed to register input device: %d\n", error);
153			return error;
154	}
155
156	return 0;
157}
158
159static int silead_ts_request_pen_input_dev(struct silead_ts_data *data)
160{
161	struct device *dev = &data->client->dev;
162	int error;
163
164	if (!data->pen_supported)
165		return 0;
166
167	data->pen_input = devm_input_allocate_device(dev);
168	if (!data->pen_input)
169		return -ENOMEM;
170
171	input_set_abs_params(data->pen_input, ABS_X, 0, 4095, 0, 0);
172	input_set_abs_params(data->pen_input, ABS_Y, 0, 4095, 0, 0);
173	input_set_capability(data->pen_input, EV_KEY, BTN_TOUCH);
174	input_set_capability(data->pen_input, EV_KEY, BTN_TOOL_PEN);
175	set_bit(INPUT_PROP_DIRECT, data->pen_input->propbit);
176	touchscreen_parse_properties(data->pen_input, false, &data->prop);
177	input_abs_set_res(data->pen_input, ABS_X, data->pen_x_res);
178	input_abs_set_res(data->pen_input, ABS_Y, data->pen_y_res);
179
180	data->pen_input->name = SILEAD_TS_NAME " pen";
181	data->pen_input->phys = "input/pen";
182	data->input->id.bustype = BUS_I2C;
183
184	error = input_register_device(data->pen_input);
185	if (error) {
186		dev_err(dev, "Failed to register pen input device: %d\n", error);
187		return error;
188	}
189
190	return 0;
191}
192
193static void silead_ts_set_power(struct i2c_client *client,
194				enum silead_ts_power state)
195{
196	struct silead_ts_data *data = i2c_get_clientdata(client);
197
198	if (data->gpio_power) {
199		gpiod_set_value_cansleep(data->gpio_power, state);
200		msleep(SILEAD_POWER_SLEEP);
201	}
202}
203
204static bool silead_ts_handle_pen_data(struct silead_ts_data *data, u8 *buf)
205{
206	u8 *coord = buf + SILEAD_POINT_DATA_LEN;
207	struct input_mt_pos pos;
208
209	if (!data->pen_supported || buf[2] != 0x00 || buf[3] != 0x00)
210		return false;
211
212	if (buf[0] == 0x00 && buf[1] == 0x00 && data->pen_down) {
213		data->pen_up_count++;
214		if (data->pen_up_count == 6) {
215			data->pen_down = false;
216			goto sync;
217		}
218		return true;
219	}
220
221	if (buf[0] == 0x01 && buf[1] == 0x08) {
222		touchscreen_set_mt_pos(&pos, &data->prop,
223			get_unaligned_le16(&coord[SILEAD_POINT_X_OFF]) & 0xfff,
224			get_unaligned_le16(&coord[SILEAD_POINT_Y_OFF]) & 0xfff);
225
226		input_report_abs(data->pen_input, ABS_X, pos.x);
227		input_report_abs(data->pen_input, ABS_Y, pos.y);
228
229		data->pen_up_count = 0;
230		data->pen_down = true;
231		goto sync;
232	}
233
234	return false;
235
236sync:
237	input_report_key(data->pen_input, BTN_TOOL_PEN, data->pen_down);
238	input_report_key(data->pen_input, BTN_TOUCH, data->pen_down);
239	input_sync(data->pen_input);
240	return true;
241}
242
243static void silead_ts_read_data(struct i2c_client *client)
244{
245	struct silead_ts_data *data = i2c_get_clientdata(client);
246	struct input_dev *input = data->input;
247	struct device *dev = &client->dev;
248	u8 *bufp, buf[SILEAD_TS_DATA_LEN];
249	int touch_nr, softbutton, error, i;
250	bool softbutton_pressed = false;
251
252	error = i2c_smbus_read_i2c_block_data(client, SILEAD_REG_DATA,
253					      SILEAD_TS_DATA_LEN, buf);
254	if (error < 0) {
255		dev_err(dev, "Data read error %d\n", error);
256		return;
257	}
258
259	if (buf[0] > data->max_fingers) {
 
260		dev_warn(dev, "More touches reported then supported %d > %d\n",
261			 buf[0], data->max_fingers);
262		buf[0] = data->max_fingers;
263	}
264
265	if (silead_ts_handle_pen_data(data, buf))
266		goto sync; /* Pen is down, release all previous touches */
267
268	touch_nr = 0;
269	bufp = buf + SILEAD_POINT_DATA_LEN;
270	for (i = 0; i < buf[0]; i++, bufp += SILEAD_POINT_DATA_LEN) {
271		softbutton = (bufp[SILEAD_POINT_Y_MSB_OFF] &
272			      SILEAD_EXTRA_DATA_MASK) >> 4;
273
274		if (softbutton) {
275			/*
276			 * For now only respond to softbutton == 0x01, some
277			 * tablets *without* a capacative button send 0x04
278			 * when crossing the edges of the screen.
279			 */
280			if (softbutton == 0x01)
281				softbutton_pressed = true;
282
283			continue;
284		}
285
286		/*
287		 * Bits 4-7 are the touch id, note not all models have
288		 * hardware touch ids so atm we don't use these.
289		 */
290		data->id[touch_nr] = (bufp[SILEAD_POINT_X_MSB_OFF] &
291				      SILEAD_EXTRA_DATA_MASK) >> 4;
292		touchscreen_set_mt_pos(&data->pos[touch_nr], &data->prop,
293			get_unaligned_le16(&bufp[SILEAD_POINT_X_OFF]) & 0xfff,
294			get_unaligned_le16(&bufp[SILEAD_POINT_Y_OFF]) & 0xfff);
295		touch_nr++;
296	}
297
298	input_mt_assign_slots(input, data->slots, data->pos, touch_nr, 0);
299
300	for (i = 0; i < touch_nr; i++) {
301		input_mt_slot(input, data->slots[i]);
302		input_mt_report_slot_state(input, MT_TOOL_FINGER, true);
303		input_report_abs(input, ABS_MT_POSITION_X, data->pos[i].x);
304		input_report_abs(input, ABS_MT_POSITION_Y, data->pos[i].y);
305
306		dev_dbg(dev, "x=%d y=%d hw_id=%d sw_id=%d\n", data->pos[i].x,
307			data->pos[i].y, data->id[i], data->slots[i]);
308	}
309
310sync:
311	input_mt_sync_frame(input);
312	input_report_key(input, KEY_LEFTMETA, softbutton_pressed);
313	input_sync(input);
314}
315
316static int silead_ts_init(struct i2c_client *client)
317{
318	struct silead_ts_data *data = i2c_get_clientdata(client);
319	int error;
320
321	error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET,
322					  SILEAD_CMD_RESET);
323	if (error)
324		goto i2c_write_err;
325	usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
326
327	error = i2c_smbus_write_byte_data(client, SILEAD_REG_TOUCH_NR,
328					data->max_fingers);
329	if (error)
330		goto i2c_write_err;
331	usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
332
333	error = i2c_smbus_write_byte_data(client, SILEAD_REG_CLOCK,
334					  SILEAD_CLOCK);
335	if (error)
336		goto i2c_write_err;
337	usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
338
339	error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET,
340					  SILEAD_CMD_START);
341	if (error)
342		goto i2c_write_err;
343	usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
344
345	return 0;
346
347i2c_write_err:
348	dev_err(&client->dev, "Registers clear error %d\n", error);
349	return error;
350}
351
352static int silead_ts_reset(struct i2c_client *client)
353{
354	int error;
355
356	error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET,
357					  SILEAD_CMD_RESET);
358	if (error)
359		goto i2c_write_err;
360	usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
361
362	error = i2c_smbus_write_byte_data(client, SILEAD_REG_CLOCK,
363					  SILEAD_CLOCK);
364	if (error)
365		goto i2c_write_err;
366	usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
367
368	error = i2c_smbus_write_byte_data(client, SILEAD_REG_POWER,
369					  SILEAD_CMD_START);
370	if (error)
371		goto i2c_write_err;
372	usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX);
373
374	return 0;
375
376i2c_write_err:
377	dev_err(&client->dev, "Chip reset error %d\n", error);
378	return error;
379}
380
381static int silead_ts_startup(struct i2c_client *client)
382{
383	int error;
384
385	error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET, 0x00);
386	if (error) {
387		dev_err(&client->dev, "Startup error %d\n", error);
388		return error;
389	}
390
391	msleep(SILEAD_STARTUP_SLEEP);
392
393	return 0;
394}
395
396static int silead_ts_load_fw(struct i2c_client *client)
397{
398	struct device *dev = &client->dev;
399	struct silead_ts_data *data = i2c_get_clientdata(client);
400	const struct firmware *fw = NULL;
401	struct silead_fw_data *fw_data;
402	unsigned int fw_size, i;
 
 
403	int error;
404
405	dev_dbg(dev, "Firmware file name: %s", data->fw_name);
406
407	/*
408	 * Unfortunately, at the time of writing this comment, we have been unable to
409	 * get permission from Silead, or from device OEMs, to distribute the necessary
410	 * Silead firmware files in linux-firmware.
411	 *
412	 * On a whole bunch of devices the UEFI BIOS code contains a touchscreen driver,
413	 * which contains an embedded copy of the firmware. The fw-loader code has a
414	 * "platform" fallback mechanism, which together with info on the firmware
415	 * from drivers/platform/x86/touchscreen_dmi.c will use the firmware from the
416	 * UEFI driver when the firmware is missing from /lib/firmware. This makes the
417	 * touchscreen work OOTB without users needing to manually download the firmware.
418	 *
419	 * The firmware bundled with the original Windows/Android is usually newer then
420	 * the firmware in the UEFI driver and it is better calibrated. This better
421	 * calibration can lead to significant differences in the reported min/max
422	 * coordinates.
423	 *
424	 * To deal with this we first try to load the firmware without "platform"
425	 * fallback. If that fails we retry with "platform" fallback and if that
426	 * succeeds we apply an (optional) set of alternative min/max values from the
427	 * "silead,efi-fw-min-max" property.
428	 */
429	error = firmware_request_nowarn(&fw, data->fw_name, dev);
430	if (error) {
431		error = firmware_request_platform(&fw, data->fw_name, dev);
432		if (error) {
433			dev_err(dev, "Firmware request error %d\n", error);
434			return error;
435		}
436
437		error = device_property_read_u32_array(dev, "silead,efi-fw-min-max",
438						       data->efi_fw_min_max,
439						       ARRAY_SIZE(data->efi_fw_min_max));
440		if (!error)
441			data->efi_fw_min_max_set = true;
442
443		/* The EFI (platform) embedded fw does not have pen support */
444		if (data->pen_supported) {
445			dev_warn(dev, "Warning loading '%s' from filesystem failed, using EFI embedded copy.\n",
446				 data->fw_name);
447			dev_warn(dev, "Warning pen support is known to be broken in the EFI embedded fw version\n");
448			data->pen_supported = false;
449		}
450	}
451
452	fw_size = fw->size / sizeof(*fw_data);
453	fw_data = (struct silead_fw_data *)fw->data;
454
455	for (i = 0; i < fw_size; i++) {
456		error = i2c_smbus_write_i2c_block_data(client,
457						       fw_data[i].offset,
458						       4,
459						       (u8 *)&fw_data[i].val);
460		if (error) {
461			dev_err(dev, "Firmware load error %d\n", error);
462			break;
463		}
464	}
465
466	release_firmware(fw);
467	return error ?: 0;
468}
469
470static u32 silead_ts_get_status(struct i2c_client *client)
471{
472	int error;
473	__le32 status;
474
475	error = i2c_smbus_read_i2c_block_data(client, SILEAD_REG_STATUS,
476					      sizeof(status), (u8 *)&status);
477	if (error < 0) {
478		dev_err(&client->dev, "Status read error %d\n", error);
479		return error;
480	}
481
482	return le32_to_cpu(status);
483}
484
485static int silead_ts_get_id(struct i2c_client *client)
486{
487	struct silead_ts_data *data = i2c_get_clientdata(client);
488	__le32 chip_id;
489	int error;
490
491	error = i2c_smbus_read_i2c_block_data(client, SILEAD_REG_ID,
492					      sizeof(chip_id), (u8 *)&chip_id);
493	if (error < 0)
 
494		return error;
 
495
496	data->chip_id = le32_to_cpu(chip_id);
497	dev_info(&client->dev, "Silead chip ID: 0x%8X", data->chip_id);
498
499	return 0;
500}
501
502static int silead_ts_setup(struct i2c_client *client)
503{
504	int error;
505	u32 status;
506
507	/*
508	 * Some buggy BIOS-es bring up the chip in a stuck state where it
509	 * blocks the I2C bus. The following steps are necessary to
510	 * unstuck the chip / bus:
511	 * 1. Turn off the Silead chip.
512	 * 2. Try to do an I2C transfer with the chip, this will fail in
513	 *    response to which the I2C-bus-driver will call:
514	 *    i2c_recover_bus() which will unstuck the I2C-bus. Note the
515	 *    unstuck-ing of the I2C bus only works if we first drop the
516	 *    chip off the bus by turning it off.
517	 * 3. Turn the chip back on.
518	 *
519	 * On the x86/ACPI systems were this problem is seen, step 1. and
520	 * 3. require making ACPI calls and dealing with ACPI Power
521	 * Resources. The workaround below runtime-suspends the chip to
522	 * turn it off, leaving it up to the ACPI subsystem to deal with
523	 * this.
524	 */
525
526	if (device_property_read_bool(&client->dev,
527				      "silead,stuck-controller-bug")) {
528		pm_runtime_set_active(&client->dev);
529		pm_runtime_enable(&client->dev);
530		pm_runtime_allow(&client->dev);
531
532		pm_runtime_suspend(&client->dev);
533
534		dev_warn(&client->dev, FW_BUG "Stuck I2C bus: please ignore the next 'controller timed out' error\n");
535		silead_ts_get_id(client);
536
537		/* The forbid will also resume the device */
538		pm_runtime_forbid(&client->dev);
539		pm_runtime_disable(&client->dev);
540	}
541
542	silead_ts_set_power(client, SILEAD_POWER_OFF);
543	silead_ts_set_power(client, SILEAD_POWER_ON);
544
545	error = silead_ts_get_id(client);
546	if (error) {
547		dev_err(&client->dev, "Chip ID read error %d\n", error);
548		return error;
549	}
550
551	error = silead_ts_init(client);
552	if (error)
553		return error;
554
555	error = silead_ts_reset(client);
556	if (error)
557		return error;
558
559	error = silead_ts_load_fw(client);
560	if (error)
561		return error;
562
563	error = silead_ts_startup(client);
564	if (error)
565		return error;
566
567	status = silead_ts_get_status(client);
568	if (status != SILEAD_STATUS_OK) {
569		dev_err(&client->dev,
570			"Initialization error, status: 0x%X\n", status);
571		return -ENODEV;
572	}
573
574	return 0;
575}
576
577static irqreturn_t silead_ts_threaded_irq_handler(int irq, void *id)
578{
579	struct silead_ts_data *data = id;
580	struct i2c_client *client = data->client;
581
582	silead_ts_read_data(client);
583
584	return IRQ_HANDLED;
585}
586
587static void silead_ts_read_props(struct i2c_client *client)
588{
589	struct silead_ts_data *data = i2c_get_clientdata(client);
590	struct device *dev = &client->dev;
591	const char *str;
592	int error;
593
594	error = device_property_read_u32(dev, "silead,max-fingers",
595					 &data->max_fingers);
596	if (error) {
597		dev_dbg(dev, "Max fingers read error %d\n", error);
598		data->max_fingers = 5; /* Most devices handle up-to 5 fingers */
599	}
600
601	error = device_property_read_string(dev, "firmware-name", &str);
602	if (!error)
603		snprintf(data->fw_name, sizeof(data->fw_name),
604			 "silead/%s", str);
605	else
606		dev_dbg(dev, "Firmware file name read error. Using default.");
607
608	data->pen_supported = device_property_read_bool(dev, "silead,pen-supported");
609	device_property_read_u32(dev, "silead,pen-resolution-x", &data->pen_x_res);
610	device_property_read_u32(dev, "silead,pen-resolution-y", &data->pen_y_res);
611}
612
613#ifdef CONFIG_ACPI
614static int silead_ts_set_default_fw_name(struct silead_ts_data *data,
615					 const struct i2c_device_id *id)
616{
617	const struct acpi_device_id *acpi_id;
618	struct device *dev = &data->client->dev;
619	int i;
620
621	if (ACPI_HANDLE(dev)) {
622		acpi_id = acpi_match_device(dev->driver->acpi_match_table, dev);
623		if (!acpi_id)
624			return -ENODEV;
625
626		snprintf(data->fw_name, sizeof(data->fw_name),
627			 "silead/%s.fw", acpi_id->id);
628
629		for (i = 0; i < strlen(data->fw_name); i++)
630			data->fw_name[i] = tolower(data->fw_name[i]);
631	} else {
632		snprintf(data->fw_name, sizeof(data->fw_name),
633			 "silead/%s.fw", id->name);
634	}
635
636	return 0;
637}
638#else
639static int silead_ts_set_default_fw_name(struct silead_ts_data *data,
640					 const struct i2c_device_id *id)
641{
642	snprintf(data->fw_name, sizeof(data->fw_name),
643		 "silead/%s.fw", id->name);
644	return 0;
645}
646#endif
647
648static void silead_disable_regulator(void *arg)
649{
650	struct silead_ts_data *data = arg;
651
652	regulator_bulk_disable(ARRAY_SIZE(data->regulators), data->regulators);
653}
654
655static int silead_ts_probe(struct i2c_client *client)
 
656{
657	const struct i2c_device_id *id = i2c_client_get_device_id(client);
658	struct silead_ts_data *data;
659	struct device *dev = &client->dev;
660	int error;
661
662	if (!i2c_check_functionality(client->adapter,
663				     I2C_FUNC_I2C |
664				     I2C_FUNC_SMBUS_READ_I2C_BLOCK |
665				     I2C_FUNC_SMBUS_WRITE_I2C_BLOCK)) {
666		dev_err(dev, "I2C functionality check failed\n");
667		return -ENXIO;
668	}
669
670	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
671	if (!data)
672		return -ENOMEM;
673
674	i2c_set_clientdata(client, data);
675	data->client = client;
676
677	error = silead_ts_set_default_fw_name(data, id);
678	if (error)
679		return error;
680
681	silead_ts_read_props(client);
682
683	/* We must have the IRQ provided by DT or ACPI subsystem */
684	if (client->irq <= 0)
685		return -ENODEV;
686
687	data->regulators[0].supply = "vddio";
688	data->regulators[1].supply = "avdd";
689	error = devm_regulator_bulk_get(dev, ARRAY_SIZE(data->regulators),
690					data->regulators);
691	if (error)
692		return error;
693
694	/*
695	 * Enable regulators at probe and disable them at remove, we need
696	 * to keep the chip powered otherwise it forgets its firmware.
697	 */
698	error = regulator_bulk_enable(ARRAY_SIZE(data->regulators),
699				      data->regulators);
700	if (error)
701		return error;
702
703	error = devm_add_action_or_reset(dev, silead_disable_regulator, data);
704	if (error)
705		return error;
706
707	/* Power GPIO pin */
708	data->gpio_power = devm_gpiod_get_optional(dev, "power", GPIOD_OUT_LOW);
709	if (IS_ERR(data->gpio_power)) {
710		if (PTR_ERR(data->gpio_power) != -EPROBE_DEFER)
711			dev_err(dev, "Shutdown GPIO request failed\n");
712		return PTR_ERR(data->gpio_power);
713	}
714
715	error = silead_ts_setup(client);
716	if (error)
717		return error;
718
719	error = silead_ts_request_input_dev(data);
720	if (error)
721		return error;
722
723	error = silead_ts_request_pen_input_dev(data);
724	if (error)
725		return error;
726
727	error = devm_request_threaded_irq(dev, client->irq,
728					  NULL, silead_ts_threaded_irq_handler,
729					  IRQF_ONESHOT, client->name, data);
730	if (error) {
731		if (error != -EPROBE_DEFER)
732			dev_err(dev, "IRQ request failed %d\n", error);
733		return error;
734	}
735
736	return 0;
737}
738
739static int __maybe_unused silead_ts_suspend(struct device *dev)
740{
741	struct i2c_client *client = to_i2c_client(dev);
742
743	disable_irq(client->irq);
744	silead_ts_set_power(client, SILEAD_POWER_OFF);
745	return 0;
746}
747
748static int __maybe_unused silead_ts_resume(struct device *dev)
749{
750	struct i2c_client *client = to_i2c_client(dev);
751	bool second_try = false;
752	int error, status;
753
754	silead_ts_set_power(client, SILEAD_POWER_ON);
755
756 retry:
757	error = silead_ts_reset(client);
758	if (error)
759		return error;
760
761	if (second_try) {
762		error = silead_ts_load_fw(client);
763		if (error)
764			return error;
765	}
766
767	error = silead_ts_startup(client);
768	if (error)
769		return error;
770
771	status = silead_ts_get_status(client);
772	if (status != SILEAD_STATUS_OK) {
773		if (!second_try) {
774			second_try = true;
775			dev_dbg(dev, "Reloading firmware after unsuccessful resume\n");
776			goto retry;
777		}
778		dev_err(dev, "Resume error, status: 0x%02x\n", status);
779		return -ENODEV;
780	}
781
782	enable_irq(client->irq);
783
784	return 0;
785}
786
787static SIMPLE_DEV_PM_OPS(silead_ts_pm, silead_ts_suspend, silead_ts_resume);
788
789static const struct i2c_device_id silead_ts_id[] = {
790	{ "gsl1680", 0 },
791	{ "gsl1688", 0 },
792	{ "gsl3670", 0 },
793	{ "gsl3675", 0 },
794	{ "gsl3692", 0 },
795	{ "mssl1680", 0 },
796	{ }
797};
798MODULE_DEVICE_TABLE(i2c, silead_ts_id);
799
800#ifdef CONFIG_ACPI
801static const struct acpi_device_id silead_ts_acpi_match[] = {
802	{ "GSL1680", 0 },
803	{ "GSL1688", 0 },
804	{ "GSL3670", 0 },
805	{ "GSL3675", 0 },
806	{ "GSL3692", 0 },
807	{ "MSSL1680", 0 },
808	{ "MSSL0001", 0 },
809	{ "MSSL0002", 0 },
810	{ "MSSL0017", 0 },
811	{ }
812};
813MODULE_DEVICE_TABLE(acpi, silead_ts_acpi_match);
814#endif
815
816#ifdef CONFIG_OF
817static const struct of_device_id silead_ts_of_match[] = {
818	{ .compatible = "silead,gsl1680" },
819	{ .compatible = "silead,gsl1688" },
820	{ .compatible = "silead,gsl3670" },
821	{ .compatible = "silead,gsl3675" },
822	{ .compatible = "silead,gsl3692" },
823	{ },
824};
825MODULE_DEVICE_TABLE(of, silead_ts_of_match);
826#endif
827
828static struct i2c_driver silead_ts_driver = {
829	.probe_new = silead_ts_probe,
830	.id_table = silead_ts_id,
831	.driver = {
832		.name = SILEAD_TS_NAME,
833		.acpi_match_table = ACPI_PTR(silead_ts_acpi_match),
834		.of_match_table = of_match_ptr(silead_ts_of_match),
835		.pm = &silead_ts_pm,
836	},
837};
838module_i2c_driver(silead_ts_driver);
839
840MODULE_AUTHOR("Robert Dolca <robert.dolca@intel.com>");
841MODULE_DESCRIPTION("Silead I2C touchscreen driver");
842MODULE_LICENSE("GPL");