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 <linux/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 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 } 120 121 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 } 157 158 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 } 191 192 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 } 202 203 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 } 241 242 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 } 314 315 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 } 349 350 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 } 378 379 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 } 393 394 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 } 467 468 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 } 482 483 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 } 499 500 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 } 574 575 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 } 584 585 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 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 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 638 639 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 } 645 646 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 } 727 728 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 } 736 737 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" }, 780 { "gsl1688" }, 781 { "gsl3670" }, 782 { "gsl3675" }, 783 { "gsl3692" }, 784 { "mssl1680" }, 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