Duson Lin | 6696777 | 2014-10-03 13:24:27 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Elan I2C/SMBus Touchpad driver - I2C interface |
| 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/completion.h> |
| 21 | #include <linux/delay.h> |
| 22 | #include <linux/i2c.h> |
| 23 | #include <linux/interrupt.h> |
| 24 | #include <linux/jiffies.h> |
| 25 | #include <linux/kernel.h> |
| 26 | #include <linux/sched.h> |
| 27 | #include <asm/unaligned.h> |
| 28 | |
| 29 | #include "elan_i2c.h" |
| 30 | |
| 31 | /* Elan i2c commands */ |
| 32 | #define ETP_I2C_RESET 0x0100 |
| 33 | #define ETP_I2C_WAKE_UP 0x0800 |
| 34 | #define ETP_I2C_SLEEP 0x0801 |
| 35 | #define ETP_I2C_DESC_CMD 0x0001 |
| 36 | #define ETP_I2C_REPORT_DESC_CMD 0x0002 |
| 37 | #define ETP_I2C_STAND_CMD 0x0005 |
| 38 | #define ETP_I2C_UNIQUEID_CMD 0x0101 |
| 39 | #define ETP_I2C_FW_VERSION_CMD 0x0102 |
| 40 | #define ETP_I2C_SM_VERSION_CMD 0x0103 |
| 41 | #define ETP_I2C_XY_TRACENUM_CMD 0x0105 |
| 42 | #define ETP_I2C_MAX_X_AXIS_CMD 0x0106 |
| 43 | #define ETP_I2C_MAX_Y_AXIS_CMD 0x0107 |
| 44 | #define ETP_I2C_RESOLUTION_CMD 0x0108 |
| 45 | #define ETP_I2C_IAP_VERSION_CMD 0x0110 |
| 46 | #define ETP_I2C_SET_CMD 0x0300 |
| 47 | #define ETP_I2C_POWER_CMD 0x0307 |
| 48 | #define ETP_I2C_FW_CHECKSUM_CMD 0x030F |
| 49 | #define ETP_I2C_IAP_CTRL_CMD 0x0310 |
| 50 | #define ETP_I2C_IAP_CMD 0x0311 |
| 51 | #define ETP_I2C_IAP_RESET_CMD 0x0314 |
| 52 | #define ETP_I2C_IAP_CHECKSUM_CMD 0x0315 |
| 53 | #define ETP_I2C_CALIBRATE_CMD 0x0316 |
| 54 | #define ETP_I2C_MAX_BASELINE_CMD 0x0317 |
| 55 | #define ETP_I2C_MIN_BASELINE_CMD 0x0318 |
| 56 | |
| 57 | #define ETP_I2C_REPORT_LEN 34 |
| 58 | #define ETP_I2C_DESC_LENGTH 30 |
| 59 | #define ETP_I2C_REPORT_DESC_LENGTH 158 |
| 60 | #define ETP_I2C_INF_LENGTH 2 |
| 61 | #define ETP_I2C_IAP_PASSWORD 0x1EA5 |
| 62 | #define ETP_I2C_IAP_RESET 0xF0F0 |
| 63 | #define ETP_I2C_MAIN_MODE_ON (1 << 9) |
| 64 | #define ETP_I2C_IAP_REG_L 0x01 |
| 65 | #define ETP_I2C_IAP_REG_H 0x06 |
| 66 | |
| 67 | static int elan_i2c_read_block(struct i2c_client *client, |
| 68 | u16 reg, u8 *val, u16 len) |
| 69 | { |
| 70 | __le16 buf[] = { |
| 71 | cpu_to_le16(reg), |
| 72 | }; |
| 73 | struct i2c_msg msgs[] = { |
| 74 | { |
| 75 | .addr = client->addr, |
| 76 | .flags = client->flags & I2C_M_TEN, |
| 77 | .len = sizeof(buf), |
| 78 | .buf = (u8 *)buf, |
| 79 | }, |
| 80 | { |
| 81 | .addr = client->addr, |
| 82 | .flags = (client->flags & I2C_M_TEN) | I2C_M_RD, |
| 83 | .len = len, |
| 84 | .buf = val, |
| 85 | } |
| 86 | }; |
| 87 | int ret; |
| 88 | |
| 89 | ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); |
| 90 | return ret == ARRAY_SIZE(msgs) ? 0 : (ret < 0 ? ret : -EIO); |
| 91 | } |
| 92 | |
| 93 | static int elan_i2c_read_cmd(struct i2c_client *client, u16 reg, u8 *val) |
| 94 | { |
| 95 | int retval; |
| 96 | |
| 97 | retval = elan_i2c_read_block(client, reg, val, ETP_I2C_INF_LENGTH); |
| 98 | if (retval < 0) { |
| 99 | dev_err(&client->dev, "reading cmd (0x%04x) fail.\n", reg); |
| 100 | return retval; |
| 101 | } |
| 102 | |
| 103 | return 0; |
| 104 | } |
| 105 | |
| 106 | static int elan_i2c_write_cmd(struct i2c_client *client, u16 reg, u16 cmd) |
| 107 | { |
| 108 | __le16 buf[] = { |
| 109 | cpu_to_le16(reg), |
| 110 | cpu_to_le16(cmd), |
| 111 | }; |
| 112 | struct i2c_msg msg = { |
| 113 | .addr = client->addr, |
| 114 | .flags = client->flags & I2C_M_TEN, |
| 115 | .len = sizeof(buf), |
| 116 | .buf = (u8 *)buf, |
| 117 | }; |
| 118 | int ret; |
| 119 | |
| 120 | ret = i2c_transfer(client->adapter, &msg, 1); |
| 121 | return ret == 1 ? 0 : (ret < 0 ? ret : -EIO); |
| 122 | } |
| 123 | |
| 124 | static int elan_i2c_initialize(struct i2c_client *client) |
| 125 | { |
| 126 | struct device *dev = &client->dev; |
| 127 | int error; |
| 128 | u8 val[256]; |
| 129 | |
| 130 | error = elan_i2c_write_cmd(client, ETP_I2C_STAND_CMD, ETP_I2C_RESET); |
| 131 | if (error) { |
| 132 | dev_err(dev, "device reset failed: %d\n", error); |
| 133 | return error; |
| 134 | } |
| 135 | |
| 136 | /* Wait for the device to reset */ |
| 137 | msleep(100); |
| 138 | |
| 139 | /* get reset acknowledgement 0000 */ |
| 140 | error = i2c_master_recv(client, val, ETP_I2C_INF_LENGTH); |
| 141 | if (error < 0) { |
| 142 | dev_err(dev, "failed to read reset response: %d\n", error); |
| 143 | return error; |
| 144 | } |
| 145 | |
| 146 | error = elan_i2c_read_block(client, ETP_I2C_DESC_CMD, |
| 147 | val, ETP_I2C_DESC_LENGTH); |
| 148 | if (error) { |
| 149 | dev_err(dev, "cannot get device descriptor: %d\n", error); |
| 150 | return error; |
| 151 | } |
| 152 | |
| 153 | error = elan_i2c_read_block(client, ETP_I2C_REPORT_DESC_CMD, |
| 154 | val, ETP_I2C_REPORT_DESC_LENGTH); |
| 155 | if (error) { |
| 156 | dev_err(dev, "fetching report descriptor failed.: %d\n", error); |
| 157 | return error; |
| 158 | } |
| 159 | |
| 160 | return 0; |
| 161 | } |
| 162 | |
| 163 | static int elan_i2c_sleep_control(struct i2c_client *client, bool sleep) |
| 164 | { |
| 165 | return elan_i2c_write_cmd(client, ETP_I2C_STAND_CMD, |
| 166 | sleep ? ETP_I2C_SLEEP : ETP_I2C_WAKE_UP); |
| 167 | } |
| 168 | |
| 169 | static int elan_i2c_power_control(struct i2c_client *client, bool enable) |
| 170 | { |
| 171 | u8 val[2]; |
| 172 | u16 reg; |
| 173 | int error; |
| 174 | |
| 175 | error = elan_i2c_read_cmd(client, ETP_I2C_POWER_CMD, val); |
| 176 | if (error) { |
| 177 | dev_err(&client->dev, |
| 178 | "failed to read current power state: %d\n", |
| 179 | error); |
| 180 | return error; |
| 181 | } |
| 182 | |
| 183 | reg = le16_to_cpup((__le16 *)val); |
| 184 | if (enable) |
| 185 | reg &= ~ETP_DISABLE_POWER; |
| 186 | else |
| 187 | reg |= ETP_DISABLE_POWER; |
| 188 | |
| 189 | error = elan_i2c_write_cmd(client, ETP_I2C_POWER_CMD, reg); |
| 190 | if (error) { |
| 191 | dev_err(&client->dev, |
| 192 | "failed to write current power state: %d\n", |
| 193 | error); |
| 194 | return error; |
| 195 | } |
| 196 | |
| 197 | return 0; |
| 198 | } |
| 199 | |
| 200 | static int elan_i2c_set_mode(struct i2c_client *client, u8 mode) |
| 201 | { |
| 202 | return elan_i2c_write_cmd(client, ETP_I2C_SET_CMD, mode); |
| 203 | } |
| 204 | |
| 205 | |
| 206 | static int elan_i2c_calibrate(struct i2c_client *client) |
| 207 | { |
| 208 | return elan_i2c_write_cmd(client, ETP_I2C_CALIBRATE_CMD, 1); |
| 209 | } |
| 210 | |
| 211 | static int elan_i2c_calibrate_result(struct i2c_client *client, u8 *val) |
| 212 | { |
| 213 | return elan_i2c_read_block(client, ETP_I2C_CALIBRATE_CMD, val, 1); |
| 214 | } |
| 215 | |
| 216 | static int elan_i2c_get_baseline_data(struct i2c_client *client, |
| 217 | bool max_baseline, u8 *value) |
| 218 | { |
| 219 | int error; |
| 220 | u8 val[3]; |
| 221 | |
| 222 | error = elan_i2c_read_cmd(client, |
| 223 | max_baseline ? ETP_I2C_MAX_BASELINE_CMD : |
| 224 | ETP_I2C_MIN_BASELINE_CMD, |
| 225 | val); |
| 226 | if (error) |
| 227 | return error; |
| 228 | |
| 229 | *value = le16_to_cpup((__le16 *)val); |
| 230 | |
| 231 | return 0; |
| 232 | } |
| 233 | |
| 234 | static int elan_i2c_get_version(struct i2c_client *client, |
| 235 | bool iap, u8 *version) |
| 236 | { |
| 237 | int error; |
| 238 | u8 val[3]; |
| 239 | |
| 240 | error = elan_i2c_read_cmd(client, |
| 241 | iap ? ETP_I2C_IAP_VERSION_CMD : |
| 242 | ETP_I2C_FW_VERSION_CMD, |
| 243 | val); |
| 244 | if (error) { |
| 245 | dev_err(&client->dev, "failed to get %s version: %d\n", |
| 246 | iap ? "IAP" : "FW", error); |
| 247 | return error; |
| 248 | } |
| 249 | |
| 250 | *version = val[0]; |
| 251 | return 0; |
| 252 | } |
| 253 | |
| 254 | static int elan_i2c_get_sm_version(struct i2c_client *client, u8 *version) |
| 255 | { |
| 256 | int error; |
| 257 | u8 val[3]; |
| 258 | |
| 259 | error = elan_i2c_read_cmd(client, ETP_I2C_SM_VERSION_CMD, val); |
| 260 | if (error) { |
| 261 | dev_err(&client->dev, "failed to get SM version: %d\n", error); |
| 262 | return error; |
| 263 | } |
| 264 | |
| 265 | *version = val[0]; |
| 266 | return 0; |
| 267 | } |
| 268 | |
| 269 | static int elan_i2c_get_product_id(struct i2c_client *client, u8 *id) |
| 270 | { |
| 271 | int error; |
| 272 | u8 val[3]; |
| 273 | |
| 274 | error = elan_i2c_read_cmd(client, ETP_I2C_UNIQUEID_CMD, val); |
| 275 | if (error) { |
| 276 | dev_err(&client->dev, "failed to get product ID: %d\n", error); |
| 277 | return error; |
| 278 | } |
| 279 | |
| 280 | *id = val[0]; |
| 281 | return 0; |
| 282 | } |
| 283 | |
| 284 | static int elan_i2c_get_checksum(struct i2c_client *client, |
| 285 | bool iap, u16 *csum) |
| 286 | { |
| 287 | int error; |
| 288 | u8 val[3]; |
| 289 | |
| 290 | error = elan_i2c_read_cmd(client, |
| 291 | iap ? ETP_I2C_IAP_CHECKSUM_CMD : |
| 292 | ETP_I2C_FW_CHECKSUM_CMD, |
| 293 | val); |
| 294 | if (error) { |
| 295 | dev_err(&client->dev, "failed to get %s checksum: %d\n", |
| 296 | iap ? "IAP" : "FW", error); |
| 297 | return error; |
| 298 | } |
| 299 | |
| 300 | *csum = le16_to_cpup((__le16 *)val); |
| 301 | return 0; |
| 302 | } |
| 303 | |
| 304 | static int elan_i2c_get_max(struct i2c_client *client, |
| 305 | unsigned int *max_x, unsigned int *max_y) |
| 306 | { |
| 307 | int error; |
| 308 | u8 val[3]; |
| 309 | |
| 310 | error = elan_i2c_read_cmd(client, ETP_I2C_MAX_X_AXIS_CMD, val); |
| 311 | if (error) { |
| 312 | dev_err(&client->dev, "failed to get X dimension: %d\n", error); |
| 313 | return error; |
| 314 | } |
| 315 | |
| 316 | *max_x = le16_to_cpup((__le16 *)val) & 0x0fff; |
| 317 | |
| 318 | error = elan_i2c_read_cmd(client, ETP_I2C_MAX_Y_AXIS_CMD, val); |
| 319 | if (error) { |
| 320 | dev_err(&client->dev, "failed to get Y dimension: %d\n", error); |
| 321 | return error; |
| 322 | } |
| 323 | |
| 324 | *max_y = le16_to_cpup((__le16 *)val) & 0x0fff; |
| 325 | |
| 326 | return 0; |
| 327 | } |
| 328 | |
| 329 | static int elan_i2c_get_resolution(struct i2c_client *client, |
| 330 | u8 *hw_res_x, u8 *hw_res_y) |
| 331 | { |
| 332 | int error; |
| 333 | u8 val[3]; |
| 334 | |
| 335 | error = elan_i2c_read_cmd(client, ETP_I2C_RESOLUTION_CMD, val); |
| 336 | if (error) { |
| 337 | dev_err(&client->dev, "failed to get resolution: %d\n", error); |
| 338 | return error; |
| 339 | } |
| 340 | |
| 341 | *hw_res_x = val[0]; |
| 342 | *hw_res_y = val[1]; |
| 343 | |
| 344 | return 0; |
| 345 | } |
| 346 | |
| 347 | static int elan_i2c_get_num_traces(struct i2c_client *client, |
| 348 | unsigned int *x_traces, |
| 349 | unsigned int *y_traces) |
| 350 | { |
| 351 | int error; |
| 352 | u8 val[3]; |
| 353 | |
| 354 | error = elan_i2c_read_cmd(client, ETP_I2C_XY_TRACENUM_CMD, val); |
| 355 | if (error) { |
| 356 | dev_err(&client->dev, "failed to get trace info: %d\n", error); |
| 357 | return error; |
| 358 | } |
| 359 | |
| 360 | *x_traces = val[0] - 1; |
| 361 | *y_traces = val[1] - 1; |
| 362 | |
| 363 | return 0; |
| 364 | } |
| 365 | |
| 366 | static int elan_i2c_iap_get_mode(struct i2c_client *client, enum tp_mode *mode) |
| 367 | { |
| 368 | int error; |
| 369 | u16 constant; |
| 370 | u8 val[3]; |
| 371 | |
| 372 | error = elan_i2c_read_cmd(client, ETP_I2C_IAP_CTRL_CMD, val); |
| 373 | if (error) { |
| 374 | dev_err(&client->dev, |
| 375 | "failed to read iap control register: %d\n", |
| 376 | error); |
| 377 | return error; |
| 378 | } |
| 379 | |
| 380 | constant = le16_to_cpup((__le16 *)val); |
| 381 | dev_dbg(&client->dev, "iap control reg: 0x%04x.\n", constant); |
| 382 | |
| 383 | *mode = (constant & ETP_I2C_MAIN_MODE_ON) ? MAIN_MODE : IAP_MODE; |
| 384 | |
| 385 | return 0; |
| 386 | } |
| 387 | |
| 388 | static int elan_i2c_iap_reset(struct i2c_client *client) |
| 389 | { |
| 390 | int error; |
| 391 | |
| 392 | error = elan_i2c_write_cmd(client, ETP_I2C_IAP_RESET_CMD, |
| 393 | ETP_I2C_IAP_RESET); |
| 394 | if (error) { |
| 395 | dev_err(&client->dev, "cannot reset IC: %d\n", error); |
| 396 | return error; |
| 397 | } |
| 398 | |
| 399 | return 0; |
| 400 | } |
| 401 | |
| 402 | static int elan_i2c_set_flash_key(struct i2c_client *client) |
| 403 | { |
| 404 | int error; |
| 405 | |
| 406 | error = elan_i2c_write_cmd(client, ETP_I2C_IAP_CMD, |
| 407 | ETP_I2C_IAP_PASSWORD); |
| 408 | if (error) { |
| 409 | dev_err(&client->dev, "cannot set flash key: %d\n", error); |
| 410 | return error; |
| 411 | } |
| 412 | |
| 413 | return 0; |
| 414 | } |
| 415 | |
| 416 | static int elan_i2c_prepare_fw_update(struct i2c_client *client) |
| 417 | { |
| 418 | struct device *dev = &client->dev; |
| 419 | int error; |
| 420 | enum tp_mode mode; |
| 421 | u8 val[3]; |
| 422 | u16 password; |
| 423 | |
| 424 | /* Get FW in which mode (IAP_MODE/MAIN_MODE) */ |
| 425 | error = elan_i2c_iap_get_mode(client, &mode); |
| 426 | if (error) |
| 427 | return error; |
| 428 | |
| 429 | if (mode == IAP_MODE) { |
| 430 | /* Reset IC */ |
| 431 | error = elan_i2c_iap_reset(client); |
| 432 | if (error) |
| 433 | return error; |
| 434 | |
| 435 | msleep(30); |
| 436 | } |
| 437 | |
| 438 | /* Set flash key*/ |
| 439 | error = elan_i2c_set_flash_key(client); |
| 440 | if (error) |
| 441 | return error; |
| 442 | |
| 443 | /* Wait for F/W IAP initialization */ |
| 444 | msleep(mode == MAIN_MODE ? 100 : 30); |
| 445 | |
| 446 | /* Check if we are in IAP mode or not */ |
| 447 | error = elan_i2c_iap_get_mode(client, &mode); |
| 448 | if (error) |
| 449 | return error; |
| 450 | |
| 451 | if (mode == MAIN_MODE) { |
| 452 | dev_err(dev, "wrong mode: %d\n", mode); |
| 453 | return -EIO; |
| 454 | } |
| 455 | |
| 456 | /* Set flash key again */ |
| 457 | error = elan_i2c_set_flash_key(client); |
| 458 | if (error) |
| 459 | return error; |
| 460 | |
| 461 | /* Wait for F/W IAP initialization */ |
| 462 | msleep(30); |
| 463 | |
| 464 | /* read back to check we actually enabled successfully. */ |
| 465 | error = elan_i2c_read_cmd(client, ETP_I2C_IAP_CMD, val); |
| 466 | if (error) { |
| 467 | dev_err(dev, "cannot read iap password: %d\n", |
| 468 | error); |
| 469 | return error; |
| 470 | } |
| 471 | |
| 472 | password = le16_to_cpup((__le16 *)val); |
| 473 | if (password != ETP_I2C_IAP_PASSWORD) { |
| 474 | dev_err(dev, "wrong iap password: 0x%X\n", password); |
| 475 | return -EIO; |
| 476 | } |
| 477 | |
| 478 | return 0; |
| 479 | } |
| 480 | |
| 481 | static int elan_i2c_write_fw_block(struct i2c_client *client, |
| 482 | const u8 *page, u16 checksum, int idx) |
| 483 | { |
| 484 | struct device *dev = &client->dev; |
| 485 | u8 page_store[ETP_FW_PAGE_SIZE + 4]; |
| 486 | u8 val[3]; |
| 487 | u16 result; |
| 488 | int ret, error; |
| 489 | |
| 490 | page_store[0] = ETP_I2C_IAP_REG_L; |
| 491 | page_store[1] = ETP_I2C_IAP_REG_H; |
| 492 | memcpy(&page_store[2], page, ETP_FW_PAGE_SIZE); |
| 493 | /* recode checksum at last two bytes */ |
| 494 | put_unaligned_le16(checksum, &page_store[ETP_FW_PAGE_SIZE + 2]); |
| 495 | |
| 496 | ret = i2c_master_send(client, page_store, sizeof(page_store)); |
| 497 | if (ret != sizeof(page_store)) { |
| 498 | error = ret < 0 ? ret : -EIO; |
| 499 | dev_err(dev, "Failed to write page %d: %d\n", idx, error); |
| 500 | return error; |
| 501 | } |
| 502 | |
| 503 | /* Wait for F/W to update one page ROM data. */ |
| 504 | msleep(20); |
| 505 | |
| 506 | error = elan_i2c_read_cmd(client, ETP_I2C_IAP_CTRL_CMD, val); |
| 507 | if (error) { |
| 508 | dev_err(dev, "Failed to read IAP write result: %d\n", error); |
| 509 | return error; |
| 510 | } |
| 511 | |
| 512 | result = le16_to_cpup((__le16 *)val); |
| 513 | if (result & (ETP_FW_IAP_PAGE_ERR | ETP_FW_IAP_INTF_ERR)) { |
| 514 | dev_err(dev, "IAP reports failed write: %04hx\n", |
| 515 | result); |
| 516 | return -EIO; |
| 517 | } |
| 518 | |
| 519 | return 0; |
| 520 | } |
| 521 | |
| 522 | static int elan_i2c_finish_fw_update(struct i2c_client *client, |
| 523 | struct completion *completion) |
| 524 | { |
| 525 | struct device *dev = &client->dev; |
| 526 | long ret; |
| 527 | int error; |
| 528 | int len; |
| 529 | u8 buffer[ETP_I2C_INF_LENGTH]; |
| 530 | |
| 531 | reinit_completion(completion); |
| 532 | enable_irq(client->irq); |
| 533 | |
| 534 | error = elan_i2c_write_cmd(client, ETP_I2C_STAND_CMD, ETP_I2C_RESET); |
| 535 | if (!error) |
| 536 | ret = wait_for_completion_interruptible_timeout(completion, |
| 537 | msecs_to_jiffies(300)); |
| 538 | disable_irq(client->irq); |
| 539 | |
| 540 | if (error) { |
| 541 | dev_err(dev, "device reset failed: %d\n", error); |
| 542 | return error; |
| 543 | } else if (ret == 0) { |
| 544 | dev_err(dev, "timeout waiting for device reset\n"); |
| 545 | return -ETIMEDOUT; |
| 546 | } else if (ret < 0) { |
| 547 | error = ret; |
| 548 | dev_err(dev, "error waiting for device reset: %d\n", error); |
| 549 | return error; |
| 550 | } |
| 551 | |
| 552 | len = i2c_master_recv(client, buffer, ETP_I2C_INF_LENGTH); |
| 553 | if (len != ETP_I2C_INF_LENGTH) { |
| 554 | error = len < 0 ? len : -EIO; |
| 555 | dev_err(dev, "failed to read INT signal: %d (%d)\n", |
| 556 | error, len); |
| 557 | return error; |
| 558 | } |
| 559 | |
| 560 | return 0; |
| 561 | } |
| 562 | |
| 563 | static int elan_i2c_get_report(struct i2c_client *client, u8 *report) |
| 564 | { |
| 565 | int len; |
| 566 | |
| 567 | len = i2c_master_recv(client, report, ETP_I2C_REPORT_LEN); |
| 568 | if (len < 0) { |
| 569 | dev_err(&client->dev, "failed to read report data: %d\n", len); |
| 570 | return len; |
| 571 | } |
| 572 | |
| 573 | if (len != ETP_I2C_REPORT_LEN) { |
| 574 | dev_err(&client->dev, |
| 575 | "wrong report length (%d vs %d expected)\n", |
| 576 | len, ETP_I2C_REPORT_LEN); |
| 577 | return -EIO; |
| 578 | } |
| 579 | |
| 580 | return 0; |
| 581 | } |
| 582 | |
| 583 | const struct elan_transport_ops elan_i2c_ops = { |
| 584 | .initialize = elan_i2c_initialize, |
| 585 | .sleep_control = elan_i2c_sleep_control, |
| 586 | .power_control = elan_i2c_power_control, |
| 587 | .set_mode = elan_i2c_set_mode, |
| 588 | |
| 589 | .calibrate = elan_i2c_calibrate, |
| 590 | .calibrate_result = elan_i2c_calibrate_result, |
| 591 | |
| 592 | .get_baseline_data = elan_i2c_get_baseline_data, |
| 593 | |
| 594 | .get_version = elan_i2c_get_version, |
| 595 | .get_sm_version = elan_i2c_get_sm_version, |
| 596 | .get_product_id = elan_i2c_get_product_id, |
| 597 | .get_checksum = elan_i2c_get_checksum, |
| 598 | |
| 599 | .get_max = elan_i2c_get_max, |
| 600 | .get_resolution = elan_i2c_get_resolution, |
| 601 | .get_num_traces = elan_i2c_get_num_traces, |
| 602 | |
| 603 | .iap_get_mode = elan_i2c_iap_get_mode, |
| 604 | .iap_reset = elan_i2c_iap_reset, |
| 605 | |
| 606 | .prepare_fw_update = elan_i2c_prepare_fw_update, |
| 607 | .write_fw_block = elan_i2c_write_fw_block, |
| 608 | .finish_fw_update = elan_i2c_finish_fw_update, |
| 609 | |
| 610 | .get_report = elan_i2c_get_report, |
| 611 | }; |