Duson Lin | 6696777 | 2014-10-03 13:24:27 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Elan I2C/SMBus Touchpad driver |
| 3 | * |
| 4 | * Copyright (c) 2013 ELAN Microelectronics Corp. |
| 5 | * |
| 6 | * Author: 林政維 (Duson Lin) <dusonlin@emc.com.tw> |
| 7 | * Version: 1.5.5 |
| 8 | * |
| 9 | * Based on cyapa driver: |
| 10 | * copyright (c) 2011-2012 Cypress Semiconductor, Inc. |
| 11 | * copyright (c) 2011-2012 Google, Inc. |
| 12 | * |
| 13 | * This program is free software; you can redistribute it and/or modify it |
| 14 | * under the terms of the GNU General Public License version 2 as published |
| 15 | * by the Free Software Foundation. |
| 16 | * |
| 17 | * Trademarks are the property of their respective owners. |
| 18 | */ |
| 19 | |
| 20 | #include <linux/acpi.h> |
| 21 | #include <linux/delay.h> |
| 22 | #include <linux/device.h> |
| 23 | #include <linux/firmware.h> |
| 24 | #include <linux/i2c.h> |
| 25 | #include <linux/init.h> |
| 26 | #include <linux/input/mt.h> |
| 27 | #include <linux/interrupt.h> |
| 28 | #include <linux/module.h> |
| 29 | #include <linux/slab.h> |
| 30 | #include <linux/kernel.h> |
| 31 | #include <linux/sched.h> |
| 32 | #include <linux/input.h> |
| 33 | #include <linux/uaccess.h> |
| 34 | #include <linux/jiffies.h> |
| 35 | #include <linux/completion.h> |
| 36 | #include <linux/of.h> |
| 37 | #include <linux/regulator/consumer.h> |
| 38 | #include <asm/unaligned.h> |
| 39 | |
| 40 | #include "elan_i2c.h" |
| 41 | |
| 42 | #define DRIVER_NAME "elan_i2c" |
| 43 | #define ELAN_DRIVER_VERSION "1.5.5" |
| 44 | #define ETP_PRESSURE_OFFSET 25 |
| 45 | #define ETP_MAX_PRESSURE 255 |
| 46 | #define ETP_FWIDTH_REDUCE 90 |
| 47 | #define ETP_FINGER_WIDTH 15 |
| 48 | #define ETP_RETRY_COUNT 3 |
| 49 | |
| 50 | #define ETP_MAX_FINGERS 5 |
| 51 | #define ETP_FINGER_DATA_LEN 5 |
| 52 | #define ETP_REPORT_ID 0x5D |
| 53 | #define ETP_REPORT_ID_OFFSET 2 |
| 54 | #define ETP_TOUCH_INFO_OFFSET 3 |
| 55 | #define ETP_FINGER_DATA_OFFSET 4 |
| 56 | #define ETP_MAX_REPORT_LEN 34 |
| 57 | |
| 58 | /* The main device structure */ |
| 59 | struct elan_tp_data { |
| 60 | struct i2c_client *client; |
| 61 | struct input_dev *input; |
| 62 | struct regulator *vcc; |
| 63 | |
| 64 | const struct elan_transport_ops *ops; |
| 65 | |
| 66 | /* for fw update */ |
| 67 | struct completion fw_completion; |
| 68 | bool in_fw_update; |
| 69 | |
| 70 | struct mutex sysfs_mutex; |
| 71 | |
| 72 | unsigned int max_x; |
| 73 | unsigned int max_y; |
| 74 | unsigned int width_x; |
| 75 | unsigned int width_y; |
| 76 | unsigned int x_res; |
| 77 | unsigned int y_res; |
| 78 | |
| 79 | u8 product_id; |
| 80 | u8 fw_version; |
| 81 | u8 sm_version; |
| 82 | u8 iap_version; |
| 83 | u16 fw_checksum; |
| 84 | |
| 85 | u8 mode; |
| 86 | |
| 87 | bool irq_wake; |
| 88 | |
| 89 | u8 min_baseline; |
| 90 | u8 max_baseline; |
| 91 | bool baseline_ready; |
| 92 | }; |
| 93 | |
| 94 | static int elan_enable_power(struct elan_tp_data *data) |
| 95 | { |
| 96 | int repeat = ETP_RETRY_COUNT; |
| 97 | int error; |
| 98 | |
| 99 | error = regulator_enable(data->vcc); |
| 100 | if (error) { |
| 101 | dev_err(&data->client->dev, |
| 102 | "Failed to enable regulator: %d\n", error); |
| 103 | return error; |
| 104 | } |
| 105 | |
| 106 | do { |
| 107 | error = data->ops->power_control(data->client, true); |
| 108 | if (error >= 0) |
| 109 | return 0; |
| 110 | |
| 111 | msleep(30); |
| 112 | } while (--repeat > 0); |
| 113 | |
| 114 | return error; |
| 115 | } |
| 116 | |
| 117 | static int elan_disable_power(struct elan_tp_data *data) |
| 118 | { |
| 119 | int repeat = ETP_RETRY_COUNT; |
| 120 | int error; |
| 121 | |
| 122 | do { |
| 123 | error = data->ops->power_control(data->client, false); |
| 124 | if (!error) { |
| 125 | error = regulator_disable(data->vcc); |
| 126 | if (error) { |
| 127 | dev_err(&data->client->dev, |
| 128 | "Failed to disable regulator: %d\n", |
| 129 | error); |
| 130 | /* Attempt to power the chip back up */ |
| 131 | data->ops->power_control(data->client, true); |
| 132 | break; |
| 133 | } |
| 134 | |
| 135 | return 0; |
| 136 | } |
| 137 | |
| 138 | msleep(30); |
| 139 | } while (--repeat > 0); |
| 140 | |
| 141 | return error; |
| 142 | } |
| 143 | |
| 144 | static int elan_sleep(struct elan_tp_data *data) |
| 145 | { |
| 146 | int repeat = ETP_RETRY_COUNT; |
| 147 | int error; |
| 148 | |
| 149 | do { |
| 150 | error = data->ops->sleep_control(data->client, true); |
| 151 | if (!error) |
| 152 | return 0; |
| 153 | |
| 154 | msleep(30); |
| 155 | } while (--repeat > 0); |
| 156 | |
| 157 | return error; |
| 158 | } |
| 159 | |
| 160 | static int __elan_initialize(struct elan_tp_data *data) |
| 161 | { |
| 162 | struct i2c_client *client = data->client; |
| 163 | int error; |
| 164 | |
| 165 | error = data->ops->initialize(client); |
| 166 | if (error) { |
| 167 | dev_err(&client->dev, "device initialize failed: %d\n", error); |
| 168 | return error; |
| 169 | } |
| 170 | |
| 171 | data->mode |= ETP_ENABLE_ABS; |
| 172 | error = data->ops->set_mode(client, data->mode); |
| 173 | if (error) { |
| 174 | dev_err(&client->dev, |
| 175 | "failed to switch to absolute mode: %d\n", error); |
| 176 | return error; |
| 177 | } |
| 178 | |
| 179 | error = data->ops->sleep_control(client, false); |
| 180 | if (error) { |
| 181 | dev_err(&client->dev, |
| 182 | "failed to wake device up: %d\n", error); |
| 183 | return error; |
| 184 | } |
| 185 | |
| 186 | return 0; |
| 187 | } |
| 188 | |
| 189 | static int elan_initialize(struct elan_tp_data *data) |
| 190 | { |
| 191 | int repeat = ETP_RETRY_COUNT; |
| 192 | int error; |
| 193 | |
| 194 | do { |
| 195 | error = __elan_initialize(data); |
| 196 | if (!error) |
| 197 | return 0; |
| 198 | |
| 199 | repeat--; |
| 200 | msleep(30); |
| 201 | } while (--repeat > 0); |
| 202 | |
| 203 | return error; |
| 204 | } |
| 205 | |
| 206 | static int elan_query_device_info(struct elan_tp_data *data) |
| 207 | { |
| 208 | int error; |
| 209 | |
| 210 | error = data->ops->get_product_id(data->client, &data->product_id); |
| 211 | if (error) |
| 212 | return error; |
| 213 | |
| 214 | error = data->ops->get_version(data->client, false, &data->fw_version); |
| 215 | if (error) |
| 216 | return error; |
| 217 | |
| 218 | error = data->ops->get_checksum(data->client, false, |
| 219 | &data->fw_checksum); |
| 220 | if (error) |
| 221 | return error; |
| 222 | |
| 223 | error = data->ops->get_sm_version(data->client, &data->sm_version); |
| 224 | if (error) |
| 225 | return error; |
| 226 | |
| 227 | error = data->ops->get_version(data->client, true, &data->iap_version); |
| 228 | if (error) |
| 229 | return error; |
| 230 | |
| 231 | return 0; |
| 232 | } |
| 233 | |
| 234 | static unsigned int elan_convert_resolution(u8 val) |
| 235 | { |
| 236 | /* |
| 237 | * (value from firmware) * 10 + 790 = dpi |
| 238 | * |
| 239 | * We also have to convert dpi to dots/mm (*10/254 to avoid floating |
| 240 | * point). |
| 241 | */ |
| 242 | |
| 243 | return ((int)(char)val * 10 + 790) * 10 / 254; |
| 244 | } |
| 245 | |
| 246 | static int elan_query_device_parameters(struct elan_tp_data *data) |
| 247 | { |
| 248 | unsigned int x_traces, y_traces; |
| 249 | u8 hw_x_res, hw_y_res; |
| 250 | int error; |
| 251 | |
| 252 | error = data->ops->get_max(data->client, &data->max_x, &data->max_y); |
| 253 | if (error) |
| 254 | return error; |
| 255 | |
| 256 | error = data->ops->get_num_traces(data->client, &x_traces, &y_traces); |
| 257 | if (error) |
| 258 | return error; |
| 259 | |
| 260 | data->width_x = data->max_x / x_traces; |
| 261 | data->width_y = data->max_y / y_traces; |
| 262 | |
| 263 | error = data->ops->get_resolution(data->client, &hw_x_res, &hw_y_res); |
| 264 | if (error) |
| 265 | return error; |
| 266 | |
| 267 | data->x_res = elan_convert_resolution(hw_x_res); |
| 268 | data->y_res = elan_convert_resolution(hw_y_res); |
| 269 | |
| 270 | return 0; |
| 271 | } |
| 272 | |
| 273 | /* |
| 274 | ********************************************************** |
| 275 | * IAP firmware updater related routines |
| 276 | ********************************************************** |
| 277 | */ |
| 278 | static int elan_write_fw_block(struct elan_tp_data *data, |
| 279 | const u8 *page, u16 checksum, int idx) |
| 280 | { |
| 281 | int retry = ETP_RETRY_COUNT; |
| 282 | int error; |
| 283 | |
| 284 | do { |
| 285 | error = data->ops->write_fw_block(data->client, |
| 286 | page, checksum, idx); |
| 287 | if (!error) |
| 288 | return 0; |
| 289 | |
| 290 | dev_dbg(&data->client->dev, |
| 291 | "IAP retrying page %d (error: %d)\n", idx, error); |
| 292 | } while (--retry > 0); |
| 293 | |
| 294 | return error; |
| 295 | } |
| 296 | |
| 297 | static int __elan_update_firmware(struct elan_tp_data *data, |
| 298 | const struct firmware *fw) |
| 299 | { |
| 300 | struct i2c_client *client = data->client; |
| 301 | struct device *dev = &client->dev; |
| 302 | int i, j; |
| 303 | int error; |
| 304 | u16 iap_start_addr; |
| 305 | u16 boot_page_count; |
| 306 | u16 sw_checksum = 0, fw_checksum = 0; |
| 307 | |
| 308 | error = data->ops->prepare_fw_update(client); |
| 309 | if (error) |
| 310 | return error; |
| 311 | |
| 312 | iap_start_addr = get_unaligned_le16(&fw->data[ETP_IAP_START_ADDR * 2]); |
| 313 | |
| 314 | boot_page_count = (iap_start_addr * 2) / ETP_FW_PAGE_SIZE; |
| 315 | for (i = boot_page_count; i < ETP_FW_PAGE_COUNT; i++) { |
| 316 | u16 checksum = 0; |
| 317 | const u8 *page = &fw->data[i * ETP_FW_PAGE_SIZE]; |
| 318 | |
| 319 | for (j = 0; j < ETP_FW_PAGE_SIZE; j += 2) |
| 320 | checksum += ((page[j + 1] << 8) | page[j]); |
| 321 | |
| 322 | error = elan_write_fw_block(data, page, checksum, i); |
| 323 | if (error) { |
| 324 | dev_err(dev, "write page %d fail: %d\n", i, error); |
| 325 | return error; |
| 326 | } |
| 327 | |
| 328 | sw_checksum += checksum; |
| 329 | } |
| 330 | |
| 331 | /* Wait WDT reset and power on reset */ |
| 332 | msleep(600); |
| 333 | |
| 334 | error = data->ops->finish_fw_update(client, &data->fw_completion); |
| 335 | if (error) |
| 336 | return error; |
| 337 | |
| 338 | error = data->ops->get_checksum(client, true, &fw_checksum); |
| 339 | if (error) |
| 340 | return error; |
| 341 | |
| 342 | if (sw_checksum != fw_checksum) { |
| 343 | dev_err(dev, "checksum diff sw=[%04X], fw=[%04X]\n", |
| 344 | sw_checksum, fw_checksum); |
| 345 | return -EIO; |
| 346 | } |
| 347 | |
| 348 | return 0; |
| 349 | } |
| 350 | |
| 351 | static int elan_update_firmware(struct elan_tp_data *data, |
| 352 | const struct firmware *fw) |
| 353 | { |
| 354 | struct i2c_client *client = data->client; |
| 355 | int retval; |
| 356 | |
| 357 | dev_dbg(&client->dev, "Starting firmware update....\n"); |
| 358 | |
| 359 | disable_irq(client->irq); |
| 360 | data->in_fw_update = true; |
| 361 | |
| 362 | retval = __elan_update_firmware(data, fw); |
| 363 | if (retval) { |
| 364 | dev_err(&client->dev, "firmware update failed: %d\n", retval); |
| 365 | data->ops->iap_reset(client); |
| 366 | } else { |
| 367 | /* Reinitialize TP after fw is updated */ |
| 368 | elan_initialize(data); |
| 369 | elan_query_device_info(data); |
| 370 | } |
| 371 | |
| 372 | data->in_fw_update = false; |
| 373 | enable_irq(client->irq); |
| 374 | |
| 375 | return retval; |
| 376 | } |
| 377 | |
| 378 | /* |
| 379 | ******************************************************************* |
| 380 | * SYSFS attributes |
| 381 | ******************************************************************* |
| 382 | */ |
| 383 | static ssize_t elan_sysfs_read_fw_checksum(struct device *dev, |
| 384 | struct device_attribute *attr, |
| 385 | char *buf) |
| 386 | { |
| 387 | struct i2c_client *client = to_i2c_client(dev); |
| 388 | struct elan_tp_data *data = i2c_get_clientdata(client); |
| 389 | |
| 390 | return sprintf(buf, "0x%04x\n", data->fw_checksum); |
| 391 | } |
| 392 | |
| 393 | static ssize_t elan_sysfs_read_product_id(struct device *dev, |
| 394 | struct device_attribute *attr, |
| 395 | char *buf) |
| 396 | { |
| 397 | struct i2c_client *client = to_i2c_client(dev); |
| 398 | struct elan_tp_data *data = i2c_get_clientdata(client); |
| 399 | |
| 400 | return sprintf(buf, "%d.0\n", data->product_id); |
| 401 | } |
| 402 | |
| 403 | static ssize_t elan_sysfs_read_fw_ver(struct device *dev, |
| 404 | struct device_attribute *attr, |
| 405 | char *buf) |
| 406 | { |
| 407 | struct i2c_client *client = to_i2c_client(dev); |
| 408 | struct elan_tp_data *data = i2c_get_clientdata(client); |
| 409 | |
| 410 | return sprintf(buf, "%d.0\n", data->fw_version); |
| 411 | } |
| 412 | |
| 413 | static ssize_t elan_sysfs_read_sm_ver(struct device *dev, |
| 414 | struct device_attribute *attr, |
| 415 | char *buf) |
| 416 | { |
| 417 | struct i2c_client *client = to_i2c_client(dev); |
| 418 | struct elan_tp_data *data = i2c_get_clientdata(client); |
| 419 | |
| 420 | return sprintf(buf, "%d.0\n", data->sm_version); |
| 421 | } |
| 422 | |
| 423 | static ssize_t elan_sysfs_read_iap_ver(struct device *dev, |
| 424 | struct device_attribute *attr, |
| 425 | char *buf) |
| 426 | { |
| 427 | struct i2c_client *client = to_i2c_client(dev); |
| 428 | struct elan_tp_data *data = i2c_get_clientdata(client); |
| 429 | |
| 430 | return sprintf(buf, "%d.0\n", data->iap_version); |
| 431 | } |
| 432 | |
| 433 | static ssize_t elan_sysfs_update_fw(struct device *dev, |
| 434 | struct device_attribute *attr, |
| 435 | const char *buf, size_t count) |
| 436 | { |
| 437 | struct i2c_client *client = to_i2c_client(dev); |
| 438 | struct elan_tp_data *data = i2c_get_clientdata(client); |
| 439 | const struct firmware *fw; |
| 440 | int error; |
| 441 | |
| 442 | error = request_firmware(&fw, ETP_FW_NAME, dev); |
| 443 | if (error) { |
| 444 | dev_err(dev, "cannot load firmware %s: %d\n", |
| 445 | ETP_FW_NAME, error); |
| 446 | return error; |
| 447 | } |
| 448 | |
| 449 | /* Firmware must be exactly PAGE_NUM * PAGE_SIZE bytes */ |
| 450 | if (fw->size != ETP_FW_SIZE) { |
| 451 | dev_err(dev, "invalid firmware size = %zu, expected %d.\n", |
| 452 | fw->size, ETP_FW_SIZE); |
| 453 | error = -EBADF; |
| 454 | goto out_release_fw; |
| 455 | } |
| 456 | |
| 457 | error = mutex_lock_interruptible(&data->sysfs_mutex); |
| 458 | if (error) |
| 459 | goto out_release_fw; |
| 460 | |
| 461 | error = elan_update_firmware(data, fw); |
| 462 | |
| 463 | mutex_unlock(&data->sysfs_mutex); |
| 464 | |
| 465 | out_release_fw: |
| 466 | release_firmware(fw); |
| 467 | return error ?: count; |
| 468 | } |
| 469 | |
| 470 | static ssize_t calibrate_store(struct device *dev, |
| 471 | struct device_attribute *attr, |
| 472 | const char *buf, size_t count) |
| 473 | { |
| 474 | struct i2c_client *client = to_i2c_client(dev); |
| 475 | struct elan_tp_data *data = i2c_get_clientdata(client); |
| 476 | int tries = 20; |
| 477 | int retval; |
| 478 | int error; |
| 479 | u8 val[3]; |
| 480 | |
| 481 | retval = mutex_lock_interruptible(&data->sysfs_mutex); |
| 482 | if (retval) |
| 483 | return retval; |
| 484 | |
| 485 | disable_irq(client->irq); |
| 486 | |
| 487 | data->mode |= ETP_ENABLE_CALIBRATE; |
| 488 | retval = data->ops->set_mode(client, data->mode); |
| 489 | if (retval) { |
| 490 | dev_err(dev, "failed to enable calibration mode: %d\n", |
| 491 | retval); |
| 492 | goto out; |
| 493 | } |
| 494 | |
| 495 | retval = data->ops->calibrate(client); |
| 496 | if (retval) { |
| 497 | dev_err(dev, "failed to start calibration: %d\n", |
| 498 | retval); |
| 499 | goto out_disable_calibrate; |
| 500 | } |
| 501 | |
| 502 | val[0] = 0xff; |
| 503 | do { |
| 504 | /* Wait 250ms before checking if calibration has completed. */ |
| 505 | msleep(250); |
| 506 | |
| 507 | retval = data->ops->calibrate_result(client, val); |
| 508 | if (retval) |
| 509 | dev_err(dev, "failed to check calibration result: %d\n", |
| 510 | retval); |
| 511 | else if (val[0] == 0) |
| 512 | break; /* calibration done */ |
| 513 | |
| 514 | } while (--tries); |
| 515 | |
| 516 | if (tries == 0) { |
| 517 | dev_err(dev, "failed to calibrate. Timeout.\n"); |
| 518 | retval = -ETIMEDOUT; |
| 519 | } |
| 520 | |
| 521 | out_disable_calibrate: |
| 522 | data->mode &= ~ETP_ENABLE_CALIBRATE; |
| 523 | error = data->ops->set_mode(data->client, data->mode); |
| 524 | if (error) { |
| 525 | dev_err(dev, "failed to disable calibration mode: %d\n", |
| 526 | error); |
| 527 | if (!retval) |
| 528 | retval = error; |
| 529 | } |
| 530 | out: |
| 531 | enable_irq(client->irq); |
| 532 | mutex_unlock(&data->sysfs_mutex); |
| 533 | return retval ?: count; |
| 534 | } |
| 535 | |
| 536 | static ssize_t elan_sysfs_read_mode(struct device *dev, |
| 537 | struct device_attribute *attr, |
| 538 | char *buf) |
| 539 | { |
| 540 | struct i2c_client *client = to_i2c_client(dev); |
| 541 | struct elan_tp_data *data = i2c_get_clientdata(client); |
| 542 | int error; |
| 543 | enum tp_mode mode; |
| 544 | |
| 545 | error = mutex_lock_interruptible(&data->sysfs_mutex); |
| 546 | if (error) |
| 547 | return error; |
| 548 | |
| 549 | error = data->ops->iap_get_mode(data->client, &mode); |
| 550 | |
| 551 | mutex_unlock(&data->sysfs_mutex); |
| 552 | |
| 553 | if (error) |
| 554 | return error; |
| 555 | |
| 556 | return sprintf(buf, "%d\n", (int)mode); |
| 557 | } |
| 558 | |
| 559 | static DEVICE_ATTR(product_id, S_IRUGO, elan_sysfs_read_product_id, NULL); |
| 560 | static DEVICE_ATTR(firmware_version, S_IRUGO, elan_sysfs_read_fw_ver, NULL); |
| 561 | static DEVICE_ATTR(sample_version, S_IRUGO, elan_sysfs_read_sm_ver, NULL); |
| 562 | static DEVICE_ATTR(iap_version, S_IRUGO, elan_sysfs_read_iap_ver, NULL); |
| 563 | static DEVICE_ATTR(fw_checksum, S_IRUGO, elan_sysfs_read_fw_checksum, NULL); |
| 564 | static DEVICE_ATTR(mode, S_IRUGO, elan_sysfs_read_mode, NULL); |
| 565 | static DEVICE_ATTR(update_fw, S_IWUSR, NULL, elan_sysfs_update_fw); |
| 566 | |
| 567 | static DEVICE_ATTR_WO(calibrate); |
| 568 | |
| 569 | static struct attribute *elan_sysfs_entries[] = { |
| 570 | &dev_attr_product_id.attr, |
| 571 | &dev_attr_firmware_version.attr, |
| 572 | &dev_attr_sample_version.attr, |
| 573 | &dev_attr_iap_version.attr, |
| 574 | &dev_attr_fw_checksum.attr, |
| 575 | &dev_attr_calibrate.attr, |
| 576 | &dev_attr_mode.attr, |
| 577 | &dev_attr_update_fw.attr, |
| 578 | NULL, |
| 579 | }; |
| 580 | |
| 581 | static const struct attribute_group elan_sysfs_group = { |
| 582 | .attrs = elan_sysfs_entries, |
| 583 | }; |
| 584 | |
| 585 | static ssize_t acquire_store(struct device *dev, struct device_attribute *attr, |
| 586 | const char *buf, size_t count) |
| 587 | { |
| 588 | struct i2c_client *client = to_i2c_client(dev); |
| 589 | struct elan_tp_data *data = i2c_get_clientdata(client); |
| 590 | int error; |
| 591 | int retval; |
| 592 | |
| 593 | retval = mutex_lock_interruptible(&data->sysfs_mutex); |
| 594 | if (retval) |
| 595 | return retval; |
| 596 | |
| 597 | disable_irq(client->irq); |
| 598 | |
| 599 | data->baseline_ready = false; |
| 600 | |
| 601 | data->mode |= ETP_ENABLE_CALIBRATE; |
| 602 | retval = data->ops->set_mode(data->client, data->mode); |
| 603 | if (retval) { |
| 604 | dev_err(dev, "Failed to enable calibration mode to get baseline: %d\n", |
| 605 | retval); |
| 606 | goto out; |
| 607 | } |
| 608 | |
| 609 | msleep(250); |
| 610 | |
| 611 | retval = data->ops->get_baseline_data(data->client, true, |
| 612 | &data->max_baseline); |
| 613 | if (retval) { |
| 614 | dev_err(dev, "Failed to read max baseline form device: %d\n", |
| 615 | retval); |
| 616 | goto out_disable_calibrate; |
| 617 | } |
| 618 | |
| 619 | retval = data->ops->get_baseline_data(data->client, false, |
| 620 | &data->min_baseline); |
| 621 | if (retval) { |
| 622 | dev_err(dev, "Failed to read min baseline form device: %d\n", |
| 623 | retval); |
| 624 | goto out_disable_calibrate; |
| 625 | } |
| 626 | |
| 627 | data->baseline_ready = true; |
| 628 | |
| 629 | out_disable_calibrate: |
| 630 | data->mode &= ~ETP_ENABLE_CALIBRATE; |
| 631 | error = data->ops->set_mode(data->client, data->mode); |
| 632 | if (error) { |
| 633 | dev_err(dev, "Failed to disable calibration mode after acquiring baseline: %d\n", |
| 634 | error); |
| 635 | if (!retval) |
| 636 | retval = error; |
| 637 | } |
| 638 | out: |
| 639 | enable_irq(client->irq); |
| 640 | mutex_unlock(&data->sysfs_mutex); |
| 641 | return retval ?: count; |
| 642 | } |
| 643 | |
| 644 | static ssize_t min_show(struct device *dev, |
| 645 | struct device_attribute *attr, char *buf) |
| 646 | { |
| 647 | struct i2c_client *client = to_i2c_client(dev); |
| 648 | struct elan_tp_data *data = i2c_get_clientdata(client); |
| 649 | int retval; |
| 650 | |
| 651 | retval = mutex_lock_interruptible(&data->sysfs_mutex); |
| 652 | if (retval) |
| 653 | return retval; |
| 654 | |
| 655 | if (!data->baseline_ready) { |
| 656 | retval = -ENODATA; |
| 657 | goto out; |
| 658 | } |
| 659 | |
| 660 | retval = snprintf(buf, PAGE_SIZE, "%d", data->min_baseline); |
| 661 | |
| 662 | out: |
| 663 | mutex_unlock(&data->sysfs_mutex); |
| 664 | return retval; |
| 665 | } |
| 666 | |
| 667 | static ssize_t max_show(struct device *dev, |
| 668 | struct device_attribute *attr, char *buf) |
| 669 | { |
| 670 | struct i2c_client *client = to_i2c_client(dev); |
| 671 | struct elan_tp_data *data = i2c_get_clientdata(client); |
| 672 | int retval; |
| 673 | |
| 674 | retval = mutex_lock_interruptible(&data->sysfs_mutex); |
| 675 | if (retval) |
| 676 | return retval; |
| 677 | |
| 678 | if (!data->baseline_ready) { |
| 679 | retval = -ENODATA; |
| 680 | goto out; |
| 681 | } |
| 682 | |
| 683 | retval = snprintf(buf, PAGE_SIZE, "%d", data->max_baseline); |
| 684 | |
| 685 | out: |
| 686 | mutex_unlock(&data->sysfs_mutex); |
| 687 | return retval; |
| 688 | } |
| 689 | |
| 690 | |
| 691 | static DEVICE_ATTR_WO(acquire); |
| 692 | static DEVICE_ATTR_RO(min); |
| 693 | static DEVICE_ATTR_RO(max); |
| 694 | |
| 695 | static struct attribute *elan_baseline_sysfs_entries[] = { |
| 696 | &dev_attr_acquire.attr, |
| 697 | &dev_attr_min.attr, |
| 698 | &dev_attr_max.attr, |
| 699 | NULL, |
| 700 | }; |
| 701 | |
| 702 | static const struct attribute_group elan_baseline_sysfs_group = { |
| 703 | .name = "baseline", |
| 704 | .attrs = elan_baseline_sysfs_entries, |
| 705 | }; |
| 706 | |
| 707 | static const struct attribute_group *elan_sysfs_groups[] = { |
| 708 | &elan_sysfs_group, |
| 709 | &elan_baseline_sysfs_group, |
| 710 | NULL |
| 711 | }; |
| 712 | |
| 713 | /* |
| 714 | ****************************************************************** |
| 715 | * Elan isr functions |
| 716 | ****************************************************************** |
| 717 | */ |
| 718 | static void elan_report_contact(struct elan_tp_data *data, |
| 719 | int contact_num, bool contact_valid, |
| 720 | u8 *finger_data) |
| 721 | { |
| 722 | struct input_dev *input = data->input; |
| 723 | unsigned int pos_x, pos_y; |
| 724 | unsigned int pressure, mk_x, mk_y; |
| 725 | unsigned int area_x, area_y, major, minor, new_pressure; |
| 726 | |
| 727 | |
| 728 | if (contact_valid) { |
| 729 | pos_x = ((finger_data[0] & 0xf0) << 4) | |
| 730 | finger_data[1]; |
| 731 | pos_y = ((finger_data[0] & 0x0f) << 8) | |
| 732 | finger_data[2]; |
| 733 | mk_x = (finger_data[3] & 0x0f); |
| 734 | mk_y = (finger_data[3] >> 4); |
| 735 | pressure = finger_data[4]; |
| 736 | |
| 737 | if (pos_x > data->max_x || pos_y > data->max_y) { |
| 738 | dev_dbg(input->dev.parent, |
| 739 | "[%d] x=%d y=%d over max (%d, %d)", |
| 740 | contact_num, pos_x, pos_y, |
| 741 | data->max_x, data->max_y); |
| 742 | return; |
| 743 | } |
| 744 | |
| 745 | /* |
| 746 | * To avoid treating large finger as palm, let's reduce the |
| 747 | * width x and y per trace. |
| 748 | */ |
| 749 | area_x = mk_x * (data->width_x - ETP_FWIDTH_REDUCE); |
| 750 | area_y = mk_y * (data->width_y - ETP_FWIDTH_REDUCE); |
| 751 | |
| 752 | major = max(area_x, area_y); |
| 753 | minor = min(area_x, area_y); |
| 754 | |
| 755 | new_pressure = pressure + ETP_PRESSURE_OFFSET; |
| 756 | if (new_pressure > ETP_MAX_PRESSURE) |
| 757 | new_pressure = ETP_MAX_PRESSURE; |
| 758 | |
| 759 | input_mt_slot(input, contact_num); |
| 760 | input_mt_report_slot_state(input, MT_TOOL_FINGER, true); |
| 761 | input_report_abs(input, ABS_MT_POSITION_X, pos_x); |
| 762 | input_report_abs(input, ABS_MT_POSITION_Y, data->max_y - pos_y); |
| 763 | input_report_abs(input, ABS_MT_PRESSURE, new_pressure); |
| 764 | input_report_abs(input, ABS_TOOL_WIDTH, mk_x); |
| 765 | input_report_abs(input, ABS_MT_TOUCH_MAJOR, major); |
| 766 | input_report_abs(input, ABS_MT_TOUCH_MINOR, minor); |
| 767 | } else { |
| 768 | input_mt_slot(input, contact_num); |
| 769 | input_mt_report_slot_state(input, MT_TOOL_FINGER, false); |
| 770 | } |
| 771 | } |
| 772 | |
| 773 | static void elan_report_absolute(struct elan_tp_data *data, u8 *packet) |
| 774 | { |
| 775 | struct input_dev *input = data->input; |
| 776 | u8 *finger_data = &packet[ETP_FINGER_DATA_OFFSET]; |
| 777 | int i; |
| 778 | u8 tp_info = packet[ETP_TOUCH_INFO_OFFSET]; |
| 779 | bool contact_valid; |
| 780 | |
| 781 | for (i = 0; i < ETP_MAX_FINGERS; i++) { |
| 782 | contact_valid = tp_info & (1U << (3 + i)); |
| 783 | elan_report_contact(data, i, contact_valid, finger_data); |
| 784 | |
| 785 | if (contact_valid) |
| 786 | finger_data += ETP_FINGER_DATA_LEN; |
| 787 | } |
| 788 | |
| 789 | input_report_key(input, BTN_LEFT, tp_info & 0x01); |
| 790 | input_mt_report_pointer_emulation(input, true); |
| 791 | input_sync(input); |
| 792 | } |
| 793 | |
| 794 | static irqreturn_t elan_isr(int irq, void *dev_id) |
| 795 | { |
| 796 | struct elan_tp_data *data = dev_id; |
| 797 | struct device *dev = &data->client->dev; |
| 798 | int error; |
| 799 | u8 report[ETP_MAX_REPORT_LEN]; |
| 800 | |
| 801 | /* |
| 802 | * When device is connected to i2c bus, when all IAP page writes |
| 803 | * complete, the driver will receive interrupt and must read |
| 804 | * 0000 to confirm that IAP is finished. |
| 805 | */ |
| 806 | if (data->in_fw_update) { |
| 807 | complete(&data->fw_completion); |
| 808 | goto out; |
| 809 | } |
| 810 | |
| 811 | error = data->ops->get_report(data->client, report); |
| 812 | if (error) |
| 813 | goto out; |
| 814 | |
| 815 | if (report[ETP_REPORT_ID_OFFSET] != ETP_REPORT_ID) |
| 816 | dev_err(dev, "invalid report id data (%x)\n", |
| 817 | report[ETP_REPORT_ID_OFFSET]); |
| 818 | else |
| 819 | elan_report_absolute(data, report); |
| 820 | |
| 821 | out: |
| 822 | return IRQ_HANDLED; |
| 823 | } |
| 824 | |
| 825 | /* |
| 826 | ****************************************************************** |
| 827 | * Elan initialization functions |
| 828 | ****************************************************************** |
| 829 | */ |
| 830 | static int elan_setup_input_device(struct elan_tp_data *data) |
| 831 | { |
| 832 | struct device *dev = &data->client->dev; |
| 833 | struct input_dev *input; |
| 834 | unsigned int max_width = max(data->width_x, data->width_y); |
| 835 | unsigned int min_width = min(data->width_x, data->width_y); |
| 836 | int error; |
| 837 | |
| 838 | input = devm_input_allocate_device(dev); |
| 839 | if (!input) |
| 840 | return -ENOMEM; |
| 841 | |
| 842 | input->name = "Elan Touchpad"; |
| 843 | input->id.bustype = BUS_I2C; |
| 844 | input_set_drvdata(input, data); |
| 845 | |
| 846 | error = input_mt_init_slots(input, ETP_MAX_FINGERS, |
| 847 | INPUT_MT_POINTER | INPUT_MT_DROP_UNUSED); |
| 848 | if (error) { |
| 849 | dev_err(dev, "failed to initialize MT slots: %d\n", error); |
| 850 | return error; |
| 851 | } |
| 852 | |
| 853 | __set_bit(EV_ABS, input->evbit); |
| 854 | __set_bit(INPUT_PROP_POINTER, input->propbit); |
| 855 | __set_bit(INPUT_PROP_BUTTONPAD, input->propbit); |
| 856 | __set_bit(BTN_LEFT, input->keybit); |
| 857 | |
| 858 | /* Set up ST parameters */ |
| 859 | input_set_abs_params(input, ABS_X, 0, data->max_x, 0, 0); |
| 860 | input_set_abs_params(input, ABS_Y, 0, data->max_y, 0, 0); |
| 861 | input_abs_set_res(input, ABS_X, data->x_res); |
| 862 | input_abs_set_res(input, ABS_Y, data->y_res); |
| 863 | input_set_abs_params(input, ABS_PRESSURE, 0, ETP_MAX_PRESSURE, 0, 0); |
| 864 | input_set_abs_params(input, ABS_TOOL_WIDTH, 0, ETP_FINGER_WIDTH, 0, 0); |
| 865 | |
| 866 | /* And MT parameters */ |
| 867 | input_set_abs_params(input, ABS_MT_POSITION_X, 0, data->max_x, 0, 0); |
| 868 | input_set_abs_params(input, ABS_MT_POSITION_Y, 0, data->max_y, 0, 0); |
| 869 | input_abs_set_res(input, ABS_MT_POSITION_X, data->x_res); |
| 870 | input_abs_set_res(input, ABS_MT_POSITION_Y, data->y_res); |
| 871 | input_set_abs_params(input, ABS_MT_PRESSURE, 0, |
| 872 | ETP_MAX_PRESSURE, 0, 0); |
| 873 | input_set_abs_params(input, ABS_MT_TOUCH_MAJOR, 0, |
| 874 | ETP_FINGER_WIDTH * max_width, 0, 0); |
| 875 | input_set_abs_params(input, ABS_MT_TOUCH_MINOR, 0, |
| 876 | ETP_FINGER_WIDTH * min_width, 0, 0); |
| 877 | |
| 878 | data->input = input; |
| 879 | |
| 880 | return 0; |
| 881 | } |
| 882 | |
| 883 | static void elan_disable_regulator(void *_data) |
| 884 | { |
| 885 | struct elan_tp_data *data = _data; |
| 886 | |
| 887 | regulator_disable(data->vcc); |
| 888 | } |
| 889 | |
| 890 | static void elan_remove_sysfs_groups(void *_data) |
| 891 | { |
| 892 | struct elan_tp_data *data = _data; |
| 893 | |
| 894 | sysfs_remove_groups(&data->client->dev.kobj, elan_sysfs_groups); |
| 895 | } |
| 896 | |
| 897 | static int elan_probe(struct i2c_client *client, |
| 898 | const struct i2c_device_id *dev_id) |
| 899 | { |
| 900 | const struct elan_transport_ops *transport_ops; |
| 901 | struct device *dev = &client->dev; |
| 902 | struct elan_tp_data *data; |
| 903 | unsigned long irqflags; |
| 904 | int error; |
| 905 | |
| 906 | if (IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_I2C) && |
| 907 | i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { |
| 908 | transport_ops = &elan_i2c_ops; |
| 909 | } else if (IS_ENABLED(CONFIG_MOUSE_ELAN_I2C_SMBUS) && |
| 910 | i2c_check_functionality(client->adapter, |
| 911 | I2C_FUNC_SMBUS_BYTE_DATA | |
| 912 | I2C_FUNC_SMBUS_BLOCK_DATA | |
| 913 | I2C_FUNC_SMBUS_I2C_BLOCK)) { |
| 914 | transport_ops = &elan_smbus_ops; |
| 915 | } else { |
| 916 | dev_err(dev, "not a supported I2C/SMBus adapter\n"); |
| 917 | return -EIO; |
| 918 | } |
| 919 | |
| 920 | data = devm_kzalloc(&client->dev, sizeof(struct elan_tp_data), |
| 921 | GFP_KERNEL); |
| 922 | if (!data) |
| 923 | return -ENOMEM; |
| 924 | |
| 925 | i2c_set_clientdata(client, data); |
| 926 | |
| 927 | data->ops = transport_ops; |
| 928 | data->client = client; |
| 929 | init_completion(&data->fw_completion); |
| 930 | mutex_init(&data->sysfs_mutex); |
| 931 | |
| 932 | data->vcc = devm_regulator_get(&client->dev, "vcc"); |
| 933 | if (IS_ERR(data->vcc)) { |
| 934 | error = PTR_ERR(data->vcc); |
| 935 | if (error != -EPROBE_DEFER) |
| 936 | dev_err(&client->dev, |
| 937 | "Failed to get 'vcc' regulator: %d\n", |
| 938 | error); |
| 939 | return error; |
| 940 | } |
| 941 | |
| 942 | error = regulator_enable(data->vcc); |
| 943 | if (error) { |
| 944 | dev_err(&client->dev, |
| 945 | "Failed to enable regulator: %d\n", error); |
| 946 | return error; |
| 947 | } |
| 948 | |
| 949 | error = devm_add_action(&client->dev, |
| 950 | elan_disable_regulator, data); |
| 951 | if (error) { |
| 952 | regulator_disable(data->vcc); |
| 953 | dev_err(&client->dev, |
| 954 | "Failed to add disable regulator action: %d\n", |
| 955 | error); |
| 956 | return error; |
| 957 | } |
| 958 | |
| 959 | /* Initialize the touchpad. */ |
| 960 | error = elan_initialize(data); |
| 961 | if (error) |
| 962 | return error; |
| 963 | |
| 964 | error = elan_query_device_info(data); |
| 965 | if (error) |
| 966 | return error; |
| 967 | |
| 968 | error = elan_query_device_parameters(data); |
| 969 | if (error) |
| 970 | return error; |
| 971 | |
| 972 | dev_dbg(&client->dev, |
| 973 | "Elan Touchpad Information:\n" |
| 974 | " Module product ID: 0x%04x\n" |
| 975 | " Firmware Version: 0x%04x\n" |
| 976 | " Sample Version: 0x%04x\n" |
| 977 | " IAP Version: 0x%04x\n" |
| 978 | " Max ABS X,Y: %d,%d\n" |
| 979 | " Width X,Y: %d,%d\n" |
| 980 | " Resolution X,Y: %d,%d (dots/mm)\n", |
| 981 | data->product_id, |
| 982 | data->fw_version, |
| 983 | data->sm_version, |
| 984 | data->iap_version, |
| 985 | data->max_x, data->max_y, |
| 986 | data->width_x, data->width_y, |
| 987 | data->x_res, data->y_res); |
| 988 | |
| 989 | /* Set up input device properties based on queried parameters. */ |
| 990 | error = elan_setup_input_device(data); |
| 991 | if (error) |
| 992 | return error; |
| 993 | |
| 994 | /* |
| 995 | * Systems using device tree should set up interrupt via DTS, |
| 996 | * the rest will use the default falling edge interrupts. |
| 997 | */ |
| 998 | irqflags = client->dev.of_node ? 0 : IRQF_TRIGGER_FALLING; |
| 999 | |
| 1000 | error = devm_request_threaded_irq(&client->dev, client->irq, |
| 1001 | NULL, elan_isr, |
| 1002 | irqflags | IRQF_ONESHOT, |
| 1003 | client->name, data); |
| 1004 | if (error) { |
| 1005 | dev_err(&client->dev, "cannot register irq=%d\n", client->irq); |
| 1006 | return error; |
| 1007 | } |
| 1008 | |
| 1009 | error = sysfs_create_groups(&client->dev.kobj, elan_sysfs_groups); |
| 1010 | if (error) { |
| 1011 | dev_err(&client->dev, "failed to create sysfs attributes: %d\n", |
| 1012 | error); |
| 1013 | return error; |
| 1014 | } |
| 1015 | |
| 1016 | error = devm_add_action(&client->dev, |
| 1017 | elan_remove_sysfs_groups, data); |
| 1018 | if (error) { |
| 1019 | elan_remove_sysfs_groups(data); |
| 1020 | dev_err(&client->dev, |
| 1021 | "Failed to add sysfs cleanup action: %d\n", |
| 1022 | error); |
| 1023 | return error; |
| 1024 | } |
| 1025 | |
| 1026 | error = input_register_device(data->input); |
| 1027 | if (error) { |
| 1028 | dev_err(&client->dev, "failed to register input device: %d\n", |
| 1029 | error); |
| 1030 | return error; |
| 1031 | } |
| 1032 | |
| 1033 | /* |
| 1034 | * Systems using device tree should set up wakeup via DTS, |
| 1035 | * the rest will configure device as wakeup source by default. |
| 1036 | */ |
| 1037 | if (!client->dev.of_node) |
| 1038 | device_init_wakeup(&client->dev, true); |
| 1039 | |
| 1040 | return 0; |
| 1041 | } |
| 1042 | |
| 1043 | static int __maybe_unused elan_suspend(struct device *dev) |
| 1044 | { |
| 1045 | struct i2c_client *client = to_i2c_client(dev); |
| 1046 | struct elan_tp_data *data = i2c_get_clientdata(client); |
| 1047 | int ret; |
| 1048 | |
| 1049 | /* |
| 1050 | * We are taking the mutex to make sure sysfs operations are |
| 1051 | * complete before we attempt to bring the device into low[er] |
| 1052 | * power mode. |
| 1053 | */ |
| 1054 | ret = mutex_lock_interruptible(&data->sysfs_mutex); |
| 1055 | if (ret) |
| 1056 | return ret; |
| 1057 | |
| 1058 | disable_irq(client->irq); |
| 1059 | |
| 1060 | if (device_may_wakeup(dev)) { |
| 1061 | ret = elan_sleep(data); |
| 1062 | /* Enable wake from IRQ */ |
| 1063 | data->irq_wake = (enable_irq_wake(client->irq) == 0); |
| 1064 | } else { |
| 1065 | ret = elan_disable_power(data); |
| 1066 | } |
| 1067 | |
| 1068 | mutex_unlock(&data->sysfs_mutex); |
| 1069 | return ret; |
| 1070 | } |
| 1071 | |
| 1072 | static int __maybe_unused elan_resume(struct device *dev) |
| 1073 | { |
| 1074 | struct i2c_client *client = to_i2c_client(dev); |
| 1075 | struct elan_tp_data *data = i2c_get_clientdata(client); |
| 1076 | int error; |
| 1077 | |
| 1078 | if (device_may_wakeup(dev) && data->irq_wake) { |
| 1079 | disable_irq_wake(client->irq); |
| 1080 | data->irq_wake = false; |
| 1081 | } |
| 1082 | |
| 1083 | error = elan_enable_power(data); |
| 1084 | if (error) |
| 1085 | dev_err(dev, "power up when resuming failed: %d\n", error); |
| 1086 | |
| 1087 | error = elan_initialize(data); |
| 1088 | if (error) |
| 1089 | dev_err(dev, "initialize when resuming failed: %d\n", error); |
| 1090 | |
| 1091 | enable_irq(data->client->irq); |
| 1092 | |
| 1093 | return 0; |
| 1094 | } |
| 1095 | |
| 1096 | static SIMPLE_DEV_PM_OPS(elan_pm_ops, elan_suspend, elan_resume); |
| 1097 | |
| 1098 | static const struct i2c_device_id elan_id[] = { |
| 1099 | { DRIVER_NAME, 0 }, |
| 1100 | { }, |
| 1101 | }; |
| 1102 | MODULE_DEVICE_TABLE(i2c, elan_id); |
| 1103 | |
| 1104 | #ifdef CONFIG_ACPI |
| 1105 | static const struct acpi_device_id elan_acpi_id[] = { |
| 1106 | { "ELAN0000", 0 }, |
| 1107 | { } |
| 1108 | }; |
| 1109 | MODULE_DEVICE_TABLE(acpi, elan_acpi_id); |
| 1110 | #endif |
| 1111 | |
| 1112 | #ifdef CONFIG_OF |
| 1113 | static const struct of_device_id elan_of_match[] = { |
| 1114 | { .compatible = "elan,ekth3000" }, |
| 1115 | { /* sentinel */ } |
| 1116 | }; |
| 1117 | MODULE_DEVICE_TABLE(of, elan_of_match); |
| 1118 | #endif |
| 1119 | |
| 1120 | static struct i2c_driver elan_driver = { |
| 1121 | .driver = { |
| 1122 | .name = DRIVER_NAME, |
| 1123 | .owner = THIS_MODULE, |
| 1124 | .pm = &elan_pm_ops, |
| 1125 | .acpi_match_table = ACPI_PTR(elan_acpi_id), |
| 1126 | .of_match_table = of_match_ptr(elan_of_match), |
| 1127 | }, |
| 1128 | .probe = elan_probe, |
| 1129 | .id_table = elan_id, |
| 1130 | }; |
| 1131 | |
| 1132 | module_i2c_driver(elan_driver); |
| 1133 | |
| 1134 | MODULE_AUTHOR("Duson Lin <dusonlin@emc.com.tw>"); |
| 1135 | MODULE_DESCRIPTION("Elan I2C/SMBus Touchpad driver"); |
| 1136 | MODULE_LICENSE("GPL"); |
| 1137 | MODULE_VERSION(ELAN_DRIVER_VERSION); |