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 return dev_err_probe(dev, PTR_ERR(data->gpio_power), 711 "Shutdown GPIO request failed\n"); 712 713 error = silead_ts_setup(client); 714 if (error) 715 return error; 716 717 error = silead_ts_request_input_dev(data); 718 if (error) 719 return error; 720 721 error = silead_ts_request_pen_input_dev(data); 722 if (error) 723 return error; 724 725 error = devm_request_threaded_irq(dev, client->irq, 726 NULL, silead_ts_threaded_irq_handler, 727 IRQF_ONESHOT, client->name, data); 728 if (error) { 729 if (error != -EPROBE_DEFER) 730 dev_err(dev, "IRQ request failed %d\n", error); 731 return error; 732 } 733 734 return 0; 735} 736 737static int silead_ts_suspend(struct device *dev) 738{ 739 struct i2c_client *client = to_i2c_client(dev); 740 741 disable_irq(client->irq); 742 silead_ts_set_power(client, SILEAD_POWER_OFF); 743 return 0; 744} 745 746static int silead_ts_resume(struct device *dev) 747{ 748 struct i2c_client *client = to_i2c_client(dev); 749 bool second_try = false; 750 int error, status; 751 752 silead_ts_set_power(client, SILEAD_POWER_ON); 753 754 retry: 755 error = silead_ts_reset(client); 756 if (error) 757 return error; 758 759 if (second_try) { 760 error = silead_ts_load_fw(client); 761 if (error) 762 return error; 763 } 764 765 error = silead_ts_startup(client); 766 if (error) 767 return error; 768 769 status = silead_ts_get_status(client); 770 if (status != SILEAD_STATUS_OK) { 771 if (!second_try) { 772 second_try = true; 773 dev_dbg(dev, "Reloading firmware after unsuccessful resume\n"); 774 goto retry; 775 } 776 dev_err(dev, "Resume error, status: 0x%02x\n", status); 777 return -ENODEV; 778 } 779 780 enable_irq(client->irq); 781 782 return 0; 783} 784 785static DEFINE_SIMPLE_DEV_PM_OPS(silead_ts_pm, silead_ts_suspend, silead_ts_resume); 786 787static const struct i2c_device_id silead_ts_id[] = { 788 { "gsl1680", 0 }, 789 { "gsl1688", 0 }, 790 { "gsl3670", 0 }, 791 { "gsl3675", 0 }, 792 { "gsl3692", 0 }, 793 { "mssl1680", 0 }, 794 { } 795}; 796MODULE_DEVICE_TABLE(i2c, silead_ts_id); 797 798#ifdef CONFIG_ACPI 799static const struct acpi_device_id silead_ts_acpi_match[] = { 800 { "GSL1680", 0 }, 801 { "GSL1688", 0 }, 802 { "GSL3670", 0 }, 803 { "GSL3675", 0 }, 804 { "GSL3692", 0 }, 805 { "MSSL1680", 0 }, 806 { "MSSL0001", 0 }, 807 { "MSSL0002", 0 }, 808 { "MSSL0017", 0 }, 809 { } 810}; 811MODULE_DEVICE_TABLE(acpi, silead_ts_acpi_match); 812#endif 813 814#ifdef CONFIG_OF 815static const struct of_device_id silead_ts_of_match[] = { 816 { .compatible = "silead,gsl1680" }, 817 { .compatible = "silead,gsl1688" }, 818 { .compatible = "silead,gsl3670" }, 819 { .compatible = "silead,gsl3675" }, 820 { .compatible = "silead,gsl3692" }, 821 { }, 822}; 823MODULE_DEVICE_TABLE(of, silead_ts_of_match); 824#endif 825 826static struct i2c_driver silead_ts_driver = { 827 .probe = silead_ts_probe, 828 .id_table = silead_ts_id, 829 .driver = { 830 .name = SILEAD_TS_NAME, 831 .acpi_match_table = ACPI_PTR(silead_ts_acpi_match), 832 .of_match_table = of_match_ptr(silead_ts_of_match), 833 .pm = pm_sleep_ptr(&silead_ts_pm), 834 }, 835}; 836module_i2c_driver(silead_ts_driver); 837 838MODULE_AUTHOR("Robert Dolca <robert.dolca@intel.com>"); 839MODULE_DESCRIPTION("Silead I2C touchscreen driver"); 840MODULE_LICENSE("GPL"); 841