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 > data->max_fingers) { 151 dev_warn(dev, "More touches reported then supported %d > %d\n", 152 touch_nr, data->max_fingers); 153 touch_nr = data->max_fingers; 154 } 155 156 bufp = buf + SILEAD_POINT_DATA_LEN; 157 for (i = 0; i < touch_nr; i++, bufp += SILEAD_POINT_DATA_LEN) { 158 /* Bits 4-7 are the touch id */ 159 data->id[i] = (bufp[SILEAD_POINT_X_MSB_OFF] & 160 SILEAD_TOUCH_ID_MASK) >> 4; 161 touchscreen_set_mt_pos(&data->pos[i], &data->prop, 162 get_unaligned_le16(&bufp[SILEAD_POINT_X_OFF]) & 0xfff, 163 get_unaligned_le16(&bufp[SILEAD_POINT_Y_OFF]) & 0xfff); 164 } 165 166 input_mt_assign_slots(input, data->slots, data->pos, touch_nr, 0); 167 168 for (i = 0; i < touch_nr; i++) { 169 input_mt_slot(input, data->slots[i]); 170 input_mt_report_slot_state(input, MT_TOOL_FINGER, true); 171 input_report_abs(input, ABS_MT_POSITION_X, data->pos[i].x); 172 input_report_abs(input, ABS_MT_POSITION_Y, data->pos[i].y); 173 174 dev_dbg(dev, "x=%d y=%d hw_id=%d sw_id=%d\n", data->pos[i].x, 175 data->pos[i].y, data->id[i], data->slots[i]); 176 } 177 178 input_mt_sync_frame(input); 179 input_sync(input); 180 } 181 182 static int silead_ts_init(struct i2c_client *client) 183 { 184 struct silead_ts_data *data = i2c_get_clientdata(client); 185 int error; 186 187 error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET, 188 SILEAD_CMD_RESET); 189 if (error) 190 goto i2c_write_err; 191 usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX); 192 193 error = i2c_smbus_write_byte_data(client, SILEAD_REG_TOUCH_NR, 194 data->max_fingers); 195 if (error) 196 goto i2c_write_err; 197 usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX); 198 199 error = i2c_smbus_write_byte_data(client, SILEAD_REG_CLOCK, 200 SILEAD_CLOCK); 201 if (error) 202 goto i2c_write_err; 203 usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX); 204 205 error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET, 206 SILEAD_CMD_START); 207 if (error) 208 goto i2c_write_err; 209 usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX); 210 211 return 0; 212 213 i2c_write_err: 214 dev_err(&client->dev, "Registers clear error %d\n", error); 215 return error; 216 } 217 218 static int silead_ts_reset(struct i2c_client *client) 219 { 220 int error; 221 222 error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET, 223 SILEAD_CMD_RESET); 224 if (error) 225 goto i2c_write_err; 226 usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX); 227 228 error = i2c_smbus_write_byte_data(client, SILEAD_REG_CLOCK, 229 SILEAD_CLOCK); 230 if (error) 231 goto i2c_write_err; 232 usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX); 233 234 error = i2c_smbus_write_byte_data(client, SILEAD_REG_POWER, 235 SILEAD_CMD_START); 236 if (error) 237 goto i2c_write_err; 238 usleep_range(SILEAD_CMD_SLEEP_MIN, SILEAD_CMD_SLEEP_MAX); 239 240 return 0; 241 242 i2c_write_err: 243 dev_err(&client->dev, "Chip reset error %d\n", error); 244 return error; 245 } 246 247 static int silead_ts_startup(struct i2c_client *client) 248 { 249 int error; 250 251 error = i2c_smbus_write_byte_data(client, SILEAD_REG_RESET, 0x00); 252 if (error) { 253 dev_err(&client->dev, "Startup error %d\n", error); 254 return error; 255 } 256 257 msleep(SILEAD_STARTUP_SLEEP); 258 259 return 0; 260 } 261 262 static int silead_ts_load_fw(struct i2c_client *client) 263 { 264 struct device *dev = &client->dev; 265 struct silead_ts_data *data = i2c_get_clientdata(client); 266 unsigned int fw_size, i; 267 const struct firmware *fw; 268 struct silead_fw_data *fw_data; 269 int error; 270 271 dev_dbg(dev, "Firmware file name: %s", data->fw_name); 272 273 error = request_firmware(&fw, data->fw_name, dev); 274 if (error) { 275 dev_err(dev, "Firmware request error %d\n", error); 276 return error; 277 } 278 279 fw_size = fw->size / sizeof(*fw_data); 280 fw_data = (struct silead_fw_data *)fw->data; 281 282 for (i = 0; i < fw_size; i++) { 283 error = i2c_smbus_write_i2c_block_data(client, 284 fw_data[i].offset, 285 4, 286 (u8 *)&fw_data[i].val); 287 if (error) { 288 dev_err(dev, "Firmware load error %d\n", error); 289 break; 290 } 291 } 292 293 release_firmware(fw); 294 return error ?: 0; 295 } 296 297 static u32 silead_ts_get_status(struct i2c_client *client) 298 { 299 int error; 300 __le32 status; 301 302 error = i2c_smbus_read_i2c_block_data(client, SILEAD_REG_STATUS, 303 sizeof(status), (u8 *)&status); 304 if (error < 0) { 305 dev_err(&client->dev, "Status read error %d\n", error); 306 return error; 307 } 308 309 return le32_to_cpu(status); 310 } 311 312 static int silead_ts_get_id(struct i2c_client *client) 313 { 314 struct silead_ts_data *data = i2c_get_clientdata(client); 315 __le32 chip_id; 316 int error; 317 318 error = i2c_smbus_read_i2c_block_data(client, SILEAD_REG_ID, 319 sizeof(chip_id), (u8 *)&chip_id); 320 if (error < 0) { 321 dev_err(&client->dev, "Chip ID read error %d\n", error); 322 return error; 323 } 324 325 data->chip_id = le32_to_cpu(chip_id); 326 dev_info(&client->dev, "Silead chip ID: 0x%8X", data->chip_id); 327 328 return 0; 329 } 330 331 static int silead_ts_setup(struct i2c_client *client) 332 { 333 int error; 334 u32 status; 335 336 silead_ts_set_power(client, SILEAD_POWER_OFF); 337 silead_ts_set_power(client, SILEAD_POWER_ON); 338 339 error = silead_ts_get_id(client); 340 if (error) 341 return error; 342 343 error = silead_ts_init(client); 344 if (error) 345 return error; 346 347 error = silead_ts_reset(client); 348 if (error) 349 return error; 350 351 error = silead_ts_load_fw(client); 352 if (error) 353 return error; 354 355 error = silead_ts_startup(client); 356 if (error) 357 return error; 358 359 status = silead_ts_get_status(client); 360 if (status != SILEAD_STATUS_OK) { 361 dev_err(&client->dev, 362 "Initialization error, status: 0x%X\n", status); 363 return -ENODEV; 364 } 365 366 return 0; 367 } 368 369 static irqreturn_t silead_ts_threaded_irq_handler(int irq, void *id) 370 { 371 struct silead_ts_data *data = id; 372 struct i2c_client *client = data->client; 373 374 silead_ts_read_data(client); 375 376 return IRQ_HANDLED; 377 } 378 379 static void silead_ts_read_props(struct i2c_client *client) 380 { 381 struct silead_ts_data *data = i2c_get_clientdata(client); 382 struct device *dev = &client->dev; 383 const char *str; 384 int error; 385 386 error = device_property_read_u32(dev, "silead,max-fingers", 387 &data->max_fingers); 388 if (error) { 389 dev_dbg(dev, "Max fingers read error %d\n", error); 390 data->max_fingers = 5; /* Most devices handle up-to 5 fingers */ 391 } 392 393 error = device_property_read_string(dev, "firmware-name", &str); 394 if (!error) 395 snprintf(data->fw_name, sizeof(data->fw_name), 396 "silead/%s", str); 397 else 398 dev_dbg(dev, "Firmware file name read error. Using default."); 399 } 400 401 #ifdef CONFIG_ACPI 402 static int silead_ts_set_default_fw_name(struct silead_ts_data *data, 403 const struct i2c_device_id *id) 404 { 405 const struct acpi_device_id *acpi_id; 406 struct device *dev = &data->client->dev; 407 int i; 408 409 if (ACPI_HANDLE(dev)) { 410 acpi_id = acpi_match_device(dev->driver->acpi_match_table, dev); 411 if (!acpi_id) 412 return -ENODEV; 413 414 snprintf(data->fw_name, sizeof(data->fw_name), 415 "silead/%s.fw", acpi_id->id); 416 417 for (i = 0; i < strlen(data->fw_name); i++) 418 data->fw_name[i] = tolower(data->fw_name[i]); 419 } else { 420 snprintf(data->fw_name, sizeof(data->fw_name), 421 "silead/%s.fw", id->name); 422 } 423 424 return 0; 425 } 426 #else 427 static int silead_ts_set_default_fw_name(struct silead_ts_data *data, 428 const struct i2c_device_id *id) 429 { 430 snprintf(data->fw_name, sizeof(data->fw_name), 431 "silead/%s.fw", id->name); 432 return 0; 433 } 434 #endif 435 436 static int silead_ts_probe(struct i2c_client *client, 437 const struct i2c_device_id *id) 438 { 439 struct silead_ts_data *data; 440 struct device *dev = &client->dev; 441 int error; 442 443 if (!i2c_check_functionality(client->adapter, 444 I2C_FUNC_I2C | 445 I2C_FUNC_SMBUS_READ_I2C_BLOCK | 446 I2C_FUNC_SMBUS_WRITE_I2C_BLOCK)) { 447 dev_err(dev, "I2C functionality check failed\n"); 448 return -ENXIO; 449 } 450 451 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); 452 if (!data) 453 return -ENOMEM; 454 455 i2c_set_clientdata(client, data); 456 data->client = client; 457 458 error = silead_ts_set_default_fw_name(data, id); 459 if (error) 460 return error; 461 462 silead_ts_read_props(client); 463 464 /* We must have the IRQ provided by DT or ACPI subsytem */ 465 if (client->irq <= 0) 466 return -ENODEV; 467 468 /* Power GPIO pin */ 469 data->gpio_power = devm_gpiod_get_optional(dev, "power", GPIOD_OUT_LOW); 470 if (IS_ERR(data->gpio_power)) { 471 if (PTR_ERR(data->gpio_power) != -EPROBE_DEFER) 472 dev_err(dev, "Shutdown GPIO request failed\n"); 473 return PTR_ERR(data->gpio_power); 474 } 475 476 error = silead_ts_setup(client); 477 if (error) 478 return error; 479 480 error = silead_ts_request_input_dev(data); 481 if (error) 482 return error; 483 484 error = devm_request_threaded_irq(dev, client->irq, 485 NULL, silead_ts_threaded_irq_handler, 486 IRQF_ONESHOT, client->name, data); 487 if (error) { 488 if (error != -EPROBE_DEFER) 489 dev_err(dev, "IRQ request failed %d\n", error); 490 return error; 491 } 492 493 return 0; 494 } 495 496 static int __maybe_unused silead_ts_suspend(struct device *dev) 497 { 498 struct i2c_client *client = to_i2c_client(dev); 499 500 silead_ts_set_power(client, SILEAD_POWER_OFF); 501 return 0; 502 } 503 504 static int __maybe_unused silead_ts_resume(struct device *dev) 505 { 506 struct i2c_client *client = to_i2c_client(dev); 507 int error, status; 508 509 silead_ts_set_power(client, SILEAD_POWER_ON); 510 511 error = silead_ts_reset(client); 512 if (error) 513 return error; 514 515 error = silead_ts_startup(client); 516 if (error) 517 return error; 518 519 status = silead_ts_get_status(client); 520 if (status != SILEAD_STATUS_OK) { 521 dev_err(dev, "Resume error, status: 0x%02x\n", status); 522 return -ENODEV; 523 } 524 525 return 0; 526 } 527 528 static SIMPLE_DEV_PM_OPS(silead_ts_pm, silead_ts_suspend, silead_ts_resume); 529 530 static const struct i2c_device_id silead_ts_id[] = { 531 { "gsl1680", 0 }, 532 { "gsl1688", 0 }, 533 { "gsl3670", 0 }, 534 { "gsl3675", 0 }, 535 { "gsl3692", 0 }, 536 { "mssl1680", 0 }, 537 { } 538 }; 539 MODULE_DEVICE_TABLE(i2c, silead_ts_id); 540 541 #ifdef CONFIG_ACPI 542 static const struct acpi_device_id silead_ts_acpi_match[] = { 543 { "GSL1680", 0 }, 544 { "GSL1688", 0 }, 545 { "GSL3670", 0 }, 546 { "GSL3675", 0 }, 547 { "GSL3692", 0 }, 548 { "MSSL1680", 0 }, 549 { } 550 }; 551 MODULE_DEVICE_TABLE(acpi, silead_ts_acpi_match); 552 #endif 553 554 static struct i2c_driver silead_ts_driver = { 555 .probe = silead_ts_probe, 556 .id_table = silead_ts_id, 557 .driver = { 558 .name = SILEAD_TS_NAME, 559 .acpi_match_table = ACPI_PTR(silead_ts_acpi_match), 560 .pm = &silead_ts_pm, 561 }, 562 }; 563 module_i2c_driver(silead_ts_driver); 564 565 MODULE_AUTHOR("Robert Dolca <robert.dolca@intel.com>"); 566 MODULE_DESCRIPTION("Silead I2C touchscreen driver"); 567 MODULE_LICENSE("GPL"); 568