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3197704c RD |
1 | /* ------------------------------------------------------------------------- |
2 | * Copyright (C) 2014-2015, Intel Corporation | |
3 | * | |
4 | * Derived from: | |
5 | * gslX68X.c | |
6 | * Copyright (C) 2010-2015, Shanghai Sileadinc Co.Ltd | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or modify | |
9 | * it under the terms of the GNU General Public License as published by | |
10 | * the Free Software Foundation; either version 2 of the License, or | |
11 | * (at your option) any later version. | |
12 | * | |
13 | * This program is distributed in the hope that it will be useful, | |
14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16 | * GNU General Public License for more details. | |
17 | * ------------------------------------------------------------------------- | |
18 | */ | |
19 | ||
20 | #include <linux/i2c.h> | |
21 | #include <linux/module.h> | |
22 | #include <linux/acpi.h> | |
23 | #include <linux/interrupt.h> | |
24 | #include <linux/gpio/consumer.h> | |
25 | #include <linux/delay.h> | |
26 | #include <linux/firmware.h> | |
27 | #include <linux/input.h> | |
28 | #include <linux/input/mt.h> | |
29 | #include <linux/input/touchscreen.h> | |
30 | #include <linux/pm.h> | |
31 | #include <linux/irq.h> | |
32 | ||
33 | #include <asm/unaligned.h> | |
34 | ||
35 | #define SILEAD_TS_NAME "silead_ts" | |
36 | ||
37 | #define SILEAD_REG_RESET 0xE0 | |
38 | #define SILEAD_REG_DATA 0x80 | |
39 | #define SILEAD_REG_TOUCH_NR 0x80 | |
40 | #define SILEAD_REG_POWER 0xBC | |
41 | #define SILEAD_REG_CLOCK 0xE4 | |
42 | #define SILEAD_REG_STATUS 0xB0 | |
43 | #define SILEAD_REG_ID 0xFC | |
44 | #define SILEAD_REG_MEM_CHECK 0xB0 | |
45 | ||
46 | #define SILEAD_STATUS_OK 0x5A5A5A5A | |
47 | #define SILEAD_TS_DATA_LEN 44 | |
48 | #define SILEAD_CLOCK 0x04 | |
49 | ||
50 | #define SILEAD_CMD_RESET 0x88 | |
51 | #define SILEAD_CMD_START 0x00 | |
52 | ||
53 | #define SILEAD_POINT_DATA_LEN 0x04 | |
54 | #define SILEAD_POINT_Y_OFF 0x00 | |
55 | #define SILEAD_POINT_Y_MSB_OFF 0x01 | |
56 | #define SILEAD_POINT_X_OFF 0x02 | |
57 | #define SILEAD_POINT_X_MSB_OFF 0x03 | |
58 | #define SILEAD_TOUCH_ID_MASK 0xF0 | |
59 | ||
60 | #define SILEAD_CMD_SLEEP_MIN 10000 | |
61 | #define SILEAD_CMD_SLEEP_MAX 20000 | |
62 | #define SILEAD_POWER_SLEEP 20 | |
63 | #define SILEAD_STARTUP_SLEEP 30 | |
64 | ||
65 | #define SILEAD_MAX_FINGERS 10 | |
66 | ||
67 | enum silead_ts_power { | |
68 | SILEAD_POWER_ON = 1, | |
69 | SILEAD_POWER_OFF = 0 | |
70 | }; | |
71 | ||
72 | struct silead_ts_data { | |
73 | struct i2c_client *client; | |
74 | struct gpio_desc *gpio_power; | |
75 | struct input_dev *input; | |
76 | char fw_name[64]; | |
77 | struct touchscreen_properties prop; | |
78 | u32 max_fingers; | |
79 | u32 chip_id; | |
80 | struct input_mt_pos pos[SILEAD_MAX_FINGERS]; | |
81 | int slots[SILEAD_MAX_FINGERS]; | |
82 | int id[SILEAD_MAX_FINGERS]; | |
83 | }; | |
84 | ||
85 | struct silead_fw_data { | |
86 | u32 offset; | |
87 | u32 val; | |
88 | }; | |
89 | ||
90 | static int silead_ts_request_input_dev(struct silead_ts_data *data) | |
91 | { | |
92 | struct device *dev = &data->client->dev; | |
93 | int error; | |
94 | ||
95 | data->input = devm_input_allocate_device(dev); | |
96 | if (!data->input) { | |
97 | dev_err(dev, | |
98 | "Failed to allocate input device\n"); | |
99 | return -ENOMEM; | |
100 | } | |
101 | ||
102 | input_set_abs_params(data->input, ABS_MT_POSITION_X, 0, 4095, 0, 0); | |
103 | input_set_abs_params(data->input, ABS_MT_POSITION_Y, 0, 4095, 0, 0); | |
104 | touchscreen_parse_properties(data->input, true, &data->prop); | |
105 | ||
106 | input_mt_init_slots(data->input, data->max_fingers, | |
107 | INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED | | |
108 | INPUT_MT_TRACK); | |
109 | ||
110 | data->input->name = SILEAD_TS_NAME; | |
111 | data->input->phys = "input/ts"; | |
112 | data->input->id.bustype = BUS_I2C; | |
113 | ||
114 | error = input_register_device(data->input); | |
115 | if (error) { | |
116 | dev_err(dev, "Failed to register input device: %d\n", error); | |
117 | return error; | |
118 | } | |
119 | ||
120 | return 0; | |
121 | } | |
122 | ||
123 | static void silead_ts_set_power(struct i2c_client *client, | |
124 | enum silead_ts_power state) | |
125 | { | |
126 | struct silead_ts_data *data = i2c_get_clientdata(client); | |
127 | ||
128 | if (data->gpio_power) { | |
129 | gpiod_set_value_cansleep(data->gpio_power, state); | |
130 | msleep(SILEAD_POWER_SLEEP); | |
131 | } | |
132 | } | |
133 | ||
134 | static void silead_ts_read_data(struct i2c_client *client) | |
135 | { | |
136 | struct silead_ts_data *data = i2c_get_clientdata(client); | |
137 | struct input_dev *input = data->input; | |
138 | struct device *dev = &client->dev; | |
139 | u8 *bufp, buf[SILEAD_TS_DATA_LEN]; | |
140 | int touch_nr, error, i; | |
141 | ||
142 | error = i2c_smbus_read_i2c_block_data(client, SILEAD_REG_DATA, | |
143 | SILEAD_TS_DATA_LEN, buf); | |
144 | if (error < 0) { | |
145 | dev_err(dev, "Data read error %d\n", error); | |
146 | return; | |
147 | } | |
148 | ||
149 | touch_nr = buf[0]; | |
150 | if (touch_nr < 0) | |
151 | return; | |
152 | ||
153 | if (touch_nr > data->max_fingers) { | |
154 | dev_warn(dev, "More touches reported then supported %d > %d\n", | |
155 | touch_nr, data->max_fingers); | |
156 | touch_nr = data->max_fingers; | |
157 | } | |
158 | ||
159 | bufp = buf + SILEAD_POINT_DATA_LEN; | |
160 | for (i = 0; i < touch_nr; i++, bufp += SILEAD_POINT_DATA_LEN) { | |
161 | /* Bits 4-7 are the touch id */ | |
162 | data->id[i] = (bufp[SILEAD_POINT_X_MSB_OFF] & | |
163 | SILEAD_TOUCH_ID_MASK) >> 4; | |
164 | touchscreen_set_mt_pos(&data->pos[i], &data->prop, | |
165 | get_unaligned_le16(&bufp[SILEAD_POINT_X_OFF]) & 0xfff, | |
166 | get_unaligned_le16(&bufp[SILEAD_POINT_Y_OFF]) & 0xfff); | |
167 | } | |
168 | ||
169 | input_mt_assign_slots(input, data->slots, data->pos, touch_nr, 0); | |
170 | ||
171 | for (i = 0; i < touch_nr; i++) { | |
172 | input_mt_slot(input, data->slots[i]); | |
173 | input_mt_report_slot_state(input, MT_TOOL_FINGER, true); | |
174 | input_report_abs(input, ABS_MT_POSITION_X, data->pos[i].x); | |
175 | input_report_abs(input, ABS_MT_POSITION_Y, data->pos[i].y); | |
176 | ||
177 | dev_dbg(dev, "x=%d y=%d hw_id=%d sw_id=%d\n", data->pos[i].x, | |
178 | data->pos[i].y, data->id[i], data->slots[i]); | |
179 | } | |
180 | ||
181 | input_mt_sync_frame(input); | |
182 | input_sync(input); | |
183 | } | |
184 | ||
185 | static int silead_ts_init(struct i2c_client *client) | |
186 | { | |
187 | struct silead_ts_data *data = i2c_get_clientdata(client); | |
188 | int error; | |
189 | ||
190 | error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET, | |
191 | SILEAD_CMD_RESET); | |
192 | if (error) | |
193 | goto i2c_write_err; | |
194 | usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX); | |
195 | ||
196 | error = i2c_smbus_write_byte_data(client, SILEAD_REG_TOUCH_NR, | |
197 | data->max_fingers); | |
198 | if (error) | |
199 | goto i2c_write_err; | |
200 | usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX); | |
201 | ||
202 | error = i2c_smbus_write_byte_data(client, SILEAD_REG_CLOCK, | |
203 | SILEAD_CLOCK); | |
204 | if (error) | |
205 | goto i2c_write_err; | |
206 | usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX); | |
207 | ||
208 | error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET, | |
209 | SILEAD_CMD_START); | |
210 | if (error) | |
211 | goto i2c_write_err; | |
212 | usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX); | |
213 | ||
214 | return 0; | |
215 | ||
216 | i2c_write_err: | |
217 | dev_err(&client->dev, "Registers clear error %d\n", error); | |
218 | return error; | |
219 | } | |
220 | ||
221 | static int silead_ts_reset(struct i2c_client *client) | |
222 | { | |
223 | int error; | |
224 | ||
225 | error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET, | |
226 | SILEAD_CMD_RESET); | |
227 | if (error) | |
228 | goto i2c_write_err; | |
229 | usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX); | |
230 | ||
231 | error = i2c_smbus_write_byte_data(client, SILEAD_REG_CLOCK, | |
232 | SILEAD_CLOCK); | |
233 | if (error) | |
234 | goto i2c_write_err; | |
235 | usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX); | |
236 | ||
237 | error = i2c_smbus_write_byte_data(client, SILEAD_REG_POWER, | |
238 | SILEAD_CMD_START); | |
239 | if (error) | |
240 | goto i2c_write_err; | |
241 | usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX); | |
242 | ||
243 | return 0; | |
244 | ||
245 | i2c_write_err: | |
246 | dev_err(&client->dev, "Chip reset error %d\n", error); | |
247 | return error; | |
248 | } | |
249 | ||
250 | static int silead_ts_startup(struct i2c_client *client) | |
251 | { | |
252 | int error; | |
253 | ||
254 | error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET, 0x00); | |
255 | if (error) { | |
256 | dev_err(&client->dev, "Startup error %d\n", error); | |
257 | return error; | |
258 | } | |
259 | ||
260 | msleep(SILEAD_STARTUP_SLEEP); | |
261 | ||
262 | return 0; | |
263 | } | |
264 | ||
265 | static int silead_ts_load_fw(struct i2c_client *client) | |
266 | { | |
267 | struct device *dev = &client->dev; | |
268 | struct silead_ts_data *data = i2c_get_clientdata(client); | |
269 | unsigned int fw_size, i; | |
270 | const struct firmware *fw; | |
271 | struct silead_fw_data *fw_data; | |
272 | int error; | |
273 | ||
274 | dev_dbg(dev, "Firmware file name: %s", data->fw_name); | |
275 | ||
276 | error = request_firmware(&fw, data->fw_name, dev); | |
277 | if (error) { | |
278 | dev_err(dev, "Firmware request error %d\n", error); | |
279 | return error; | |
280 | } | |
281 | ||
282 | fw_size = fw->size / sizeof(*fw_data); | |
283 | fw_data = (struct silead_fw_data *)fw->data; | |
284 | ||
285 | for (i = 0; i < fw_size; i++) { | |
286 | error = i2c_smbus_write_i2c_block_data(client, | |
287 | fw_data[i].offset, | |
288 | 4, | |
289 | (u8 *)&fw_data[i].val); | |
290 | if (error) { | |
291 | dev_err(dev, "Firmware load error %d\n", error); | |
292 | break; | |
293 | } | |
294 | } | |
295 | ||
296 | release_firmware(fw); | |
297 | return error ?: 0; | |
298 | } | |
299 | ||
300 | static u32 silead_ts_get_status(struct i2c_client *client) | |
301 | { | |
302 | int error; | |
303 | __le32 status; | |
304 | ||
305 | error = i2c_smbus_read_i2c_block_data(client, SILEAD_REG_STATUS, | |
306 | sizeof(status), (u8 *)&status); | |
307 | if (error < 0) { | |
308 | dev_err(&client->dev, "Status read error %d\n", error); | |
309 | return error; | |
310 | } | |
311 | ||
312 | return le32_to_cpu(status); | |
313 | } | |
314 | ||
315 | static int silead_ts_get_id(struct i2c_client *client) | |
316 | { | |
317 | struct silead_ts_data *data = i2c_get_clientdata(client); | |
318 | __le32 chip_id; | |
319 | int error; | |
320 | ||
321 | error = i2c_smbus_read_i2c_block_data(client, SILEAD_REG_ID, | |
322 | sizeof(chip_id), (u8 *)&chip_id); | |
323 | if (error < 0) { | |
324 | dev_err(&client->dev, "Chip ID read error %d\n", error); | |
325 | return error; | |
326 | } | |
327 | ||
328 | data->chip_id = le32_to_cpu(chip_id); | |
329 | dev_info(&client->dev, "Silead chip ID: 0x%8X", data->chip_id); | |
330 | ||
331 | return 0; | |
332 | } | |
333 | ||
334 | static int silead_ts_setup(struct i2c_client *client) | |
335 | { | |
336 | int error; | |
337 | u32 status; | |
338 | ||
339 | silead_ts_set_power(client, SILEAD_POWER_OFF); | |
340 | silead_ts_set_power(client, SILEAD_POWER_ON); | |
341 | ||
342 | error = silead_ts_get_id(client); | |
343 | if (error) | |
344 | return error; | |
345 | ||
346 | error = silead_ts_init(client); | |
347 | if (error) | |
348 | return error; | |
349 | ||
350 | error = silead_ts_reset(client); | |
351 | if (error) | |
352 | return error; | |
353 | ||
354 | error = silead_ts_load_fw(client); | |
355 | if (error) | |
356 | return error; | |
357 | ||
358 | error = silead_ts_startup(client); | |
359 | if (error) | |
360 | return error; | |
361 | ||
362 | status = silead_ts_get_status(client); | |
363 | if (status != SILEAD_STATUS_OK) { | |
364 | dev_err(&client->dev, | |
365 | "Initialization error, status: 0x%X\n", status); | |
366 | return -ENODEV; | |
367 | } | |
368 | ||
369 | return 0; | |
370 | } | |
371 | ||
372 | static irqreturn_t silead_ts_threaded_irq_handler(int irq, void *id) | |
373 | { | |
374 | struct silead_ts_data *data = id; | |
375 | struct i2c_client *client = data->client; | |
376 | ||
377 | silead_ts_read_data(client); | |
378 | ||
379 | return IRQ_HANDLED; | |
380 | } | |
381 | ||
382 | static void silead_ts_read_props(struct i2c_client *client) | |
383 | { | |
384 | struct silead_ts_data *data = i2c_get_clientdata(client); | |
385 | struct device *dev = &client->dev; | |
386 | const char *str; | |
387 | int error; | |
388 | ||
389 | error = device_property_read_u32(dev, "silead,max-fingers", | |
390 | &data->max_fingers); | |
391 | if (error) { | |
392 | dev_dbg(dev, "Max fingers read error %d\n", error); | |
393 | data->max_fingers = 5; /* Most devices handle up-to 5 fingers */ | |
394 | } | |
395 | ||
396 | error = device_property_read_string(dev, "touchscreen-fw-name", &str); | |
397 | if (!error) | |
398 | snprintf(data->fw_name, sizeof(data->fw_name), "%s", str); | |
399 | else | |
400 | dev_dbg(dev, "Firmware file name read error. Using default."); | |
401 | } | |
402 | ||
403 | #ifdef CONFIG_ACPI | |
404 | static int silead_ts_set_default_fw_name(struct silead_ts_data *data, | |
405 | const struct i2c_device_id *id) | |
406 | { | |
407 | const struct acpi_device_id *acpi_id; | |
408 | struct device *dev = &data->client->dev; | |
409 | int i; | |
410 | ||
411 | if (ACPI_HANDLE(dev)) { | |
412 | acpi_id = acpi_match_device(dev->driver->acpi_match_table, dev); | |
413 | if (!acpi_id) | |
414 | return -ENODEV; | |
415 | ||
416 | snprintf(data->fw_name, sizeof(data->fw_name), "%s.fw", | |
417 | acpi_id->id); | |
418 | ||
419 | for (i = 0; i < strlen(data->fw_name); i++) | |
420 | data->fw_name[i] = tolower(data->fw_name[i]); | |
421 | } else { | |
422 | snprintf(data->fw_name, sizeof(data->fw_name), "%s.fw", | |
423 | id->name); | |
424 | } | |
425 | ||
426 | return 0; | |
427 | } | |
428 | #else | |
429 | static int silead_ts_set_default_fw_name(struct silead_ts_data *data, | |
430 | const struct i2c_device_id *id) | |
431 | { | |
432 | snprintf(data->fw_name, sizeof(data->fw_name), "%s.fw", id->name); | |
433 | return 0; | |
434 | } | |
435 | #endif | |
436 | ||
437 | static int silead_ts_probe(struct i2c_client *client, | |
438 | const struct i2c_device_id *id) | |
439 | { | |
440 | struct silead_ts_data *data; | |
441 | struct device *dev = &client->dev; | |
442 | int error; | |
443 | ||
444 | if (!i2c_check_functionality(client->adapter, | |
445 | I2C_FUNC_I2C | | |
446 | I2C_FUNC_SMBUS_READ_I2C_BLOCK | | |
447 | I2C_FUNC_SMBUS_WRITE_I2C_BLOCK)) { | |
448 | dev_err(dev, "I2C functionality check failed\n"); | |
449 | return -ENXIO; | |
450 | } | |
451 | ||
452 | data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); | |
453 | if (!data) | |
454 | return -ENOMEM; | |
455 | ||
456 | i2c_set_clientdata(client, data); | |
457 | data->client = client; | |
458 | ||
459 | error = silead_ts_set_default_fw_name(data, id); | |
460 | if (error) | |
461 | return error; | |
462 | ||
463 | silead_ts_read_props(client); | |
464 | ||
465 | /* We must have the IRQ provided by DT or ACPI subsytem */ | |
466 | if (client->irq <= 0) | |
467 | return -ENODEV; | |
468 | ||
469 | /* Power GPIO pin */ | |
470 | data->gpio_power = gpiod_get_optional(dev, "power", GPIOD_OUT_LOW); | |
471 | if (IS_ERR(data->gpio_power)) { | |
472 | if (PTR_ERR(data->gpio_power) != -EPROBE_DEFER) | |
473 | dev_err(dev, "Shutdown GPIO request failed\n"); | |
474 | return PTR_ERR(data->gpio_power); | |
475 | } | |
476 | ||
477 | error = silead_ts_setup(client); | |
478 | if (error) | |
479 | return error; | |
480 | ||
481 | error = silead_ts_request_input_dev(data); | |
482 | if (error) | |
483 | return error; | |
484 | ||
485 | error = devm_request_threaded_irq(dev, client->irq, | |
486 | NULL, silead_ts_threaded_irq_handler, | |
487 | IRQF_ONESHOT, client->name, data); | |
488 | if (error) { | |
489 | if (error != -EPROBE_DEFER) | |
490 | dev_err(dev, "IRQ request failed %d\n", error); | |
491 | return error; | |
492 | } | |
493 | ||
494 | return 0; | |
495 | } | |
496 | ||
497 | static int __maybe_unused silead_ts_suspend(struct device *dev) | |
498 | { | |
499 | struct i2c_client *client = to_i2c_client(dev); | |
500 | ||
501 | silead_ts_set_power(client, SILEAD_POWER_OFF); | |
502 | return 0; | |
503 | } | |
504 | ||
505 | static int __maybe_unused silead_ts_resume(struct device *dev) | |
506 | { | |
507 | struct i2c_client *client = to_i2c_client(dev); | |
508 | int error, status; | |
509 | ||
510 | silead_ts_set_power(client, SILEAD_POWER_ON); | |
511 | ||
512 | error = silead_ts_reset(client); | |
513 | if (error) | |
514 | return error; | |
515 | ||
516 | error = silead_ts_startup(client); | |
517 | if (error) | |
518 | return error; | |
519 | ||
520 | status = silead_ts_get_status(client); | |
521 | if (status != SILEAD_STATUS_OK) { | |
522 | dev_err(dev, "Resume error, status: 0x%02x\n", status); | |
523 | return -ENODEV; | |
524 | } | |
525 | ||
526 | return 0; | |
527 | } | |
528 | ||
529 | static SIMPLE_DEV_PM_OPS(silead_ts_pm, silead_ts_suspend, silead_ts_resume); | |
530 | ||
531 | static const struct i2c_device_id silead_ts_id[] = { | |
532 | { "gsl1680", 0 }, | |
533 | { "gsl1688", 0 }, | |
534 | { "gsl3670", 0 }, | |
535 | { "gsl3675", 0 }, | |
536 | { "gsl3692", 0 }, | |
537 | { "mssl1680", 0 }, | |
538 | { } | |
539 | }; | |
540 | MODULE_DEVICE_TABLE(i2c, silead_ts_id); | |
541 | ||
542 | #ifdef CONFIG_ACPI | |
543 | static const struct acpi_device_id silead_ts_acpi_match[] = { | |
544 | { "GSL1680", 0 }, | |
545 | { "GSL1688", 0 }, | |
546 | { "GSL3670", 0 }, | |
547 | { "GSL3675", 0 }, | |
548 | { "GSL3692", 0 }, | |
549 | { "MSSL1680", 0 }, | |
550 | { } | |
551 | }; | |
552 | MODULE_DEVICE_TABLE(acpi, silead_ts_acpi_match); | |
553 | #endif | |
554 | ||
555 | static struct i2c_driver silead_ts_driver = { | |
556 | .probe = silead_ts_probe, | |
557 | .id_table = silead_ts_id, | |
558 | .driver = { | |
559 | .name = SILEAD_TS_NAME, | |
560 | .acpi_match_table = ACPI_PTR(silead_ts_acpi_match), | |
561 | .pm = &silead_ts_pm, | |
562 | }, | |
563 | }; | |
564 | module_i2c_driver(silead_ts_driver); | |
565 | ||
566 | MODULE_AUTHOR("Robert Dolca <robert.dolca@intel.com>"); | |
567 | MODULE_DESCRIPTION("Silead I2C touchscreen driver"); | |
568 | MODULE_LICENSE("GPL"); |