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