1 /* 2 * Weida HiTech WDT87xx TouchScreen I2C driver 3 * 4 * Copyright (c) 2015 Weida Hi-Tech Co., Ltd. 5 * HN Chen <hn.chen@weidahitech.com> 6 * 7 * This software is licensed under the terms of the GNU General Public 8 * License, as published by the Free Software Foundation, and 9 * may be copied, distributed, and modified under those terms. 10 */ 11 12 #include <linux/i2c.h> 13 #include <linux/input.h> 14 #include <linux/interrupt.h> 15 #include <linux/delay.h> 16 #include <linux/irq.h> 17 #include <linux/io.h> 18 #include <linux/module.h> 19 #include <linux/slab.h> 20 #include <linux/firmware.h> 21 #include <linux/input/mt.h> 22 #include <linux/acpi.h> 23 #include <asm/unaligned.h> 24 25 #define WDT87XX_NAME "wdt87xx_i2c" 26 #define WDT87XX_FW_NAME "wdt87xx_fw.bin" 27 #define WDT87XX_CFG_NAME "wdt87xx_cfg.bin" 28 29 #define MODE_ACTIVE 0x01 30 #define MODE_READY 0x02 31 #define MODE_IDLE 0x03 32 #define MODE_SLEEP 0x04 33 #define MODE_STOP 0xFF 34 35 #define WDT_MAX_FINGER 10 36 #define WDT_RAW_BUF_COUNT 54 37 #define WDT_V1_RAW_BUF_COUNT 74 38 #define WDT_FIRMWARE_ID 0xa9e368f5 39 40 #define PG_SIZE 0x1000 41 #define MAX_RETRIES 3 42 43 #define MAX_UNIT_AXIS 0x7FFF 44 45 #define PKT_READ_SIZE 72 46 #define PKT_WRITE_SIZE 80 47 48 /* the finger definition of the report event */ 49 #define FINGER_EV_OFFSET_ID 0 50 #define FINGER_EV_OFFSET_X 1 51 #define FINGER_EV_OFFSET_Y 3 52 #define FINGER_EV_SIZE 5 53 54 #define FINGER_EV_V1_OFFSET_ID 0 55 #define FINGER_EV_V1_OFFSET_W 1 56 #define FINGER_EV_V1_OFFSET_P 2 57 #define FINGER_EV_V1_OFFSET_X 3 58 #define FINGER_EV_V1_OFFSET_Y 5 59 #define FINGER_EV_V1_SIZE 7 60 61 /* The definition of a report packet */ 62 #define TOUCH_PK_OFFSET_REPORT_ID 0 63 #define TOUCH_PK_OFFSET_EVENT 1 64 #define TOUCH_PK_OFFSET_SCAN_TIME 51 65 #define TOUCH_PK_OFFSET_FNGR_NUM 53 66 67 #define TOUCH_PK_V1_OFFSET_REPORT_ID 0 68 #define TOUCH_PK_V1_OFFSET_EVENT 1 69 #define TOUCH_PK_V1_OFFSET_SCAN_TIME 71 70 #define TOUCH_PK_V1_OFFSET_FNGR_NUM 73 71 72 /* The definition of the controller parameters */ 73 #define CTL_PARAM_OFFSET_FW_ID 0 74 #define CTL_PARAM_OFFSET_PLAT_ID 2 75 #define CTL_PARAM_OFFSET_XMLS_ID1 4 76 #define CTL_PARAM_OFFSET_XMLS_ID2 6 77 #define CTL_PARAM_OFFSET_PHY_CH_X 8 78 #define CTL_PARAM_OFFSET_PHY_CH_Y 10 79 #define CTL_PARAM_OFFSET_PHY_X0 12 80 #define CTL_PARAM_OFFSET_PHY_X1 14 81 #define CTL_PARAM_OFFSET_PHY_Y0 16 82 #define CTL_PARAM_OFFSET_PHY_Y1 18 83 #define CTL_PARAM_OFFSET_PHY_W 22 84 #define CTL_PARAM_OFFSET_PHY_H 24 85 #define CTL_PARAM_OFFSET_FACTOR 32 86 87 /* The definition of the device descriptor */ 88 #define WDT_GD_DEVICE 1 89 #define DEV_DESC_OFFSET_VID 8 90 #define DEV_DESC_OFFSET_PID 10 91 92 /* Communication commands */ 93 #define PACKET_SIZE 56 94 #define VND_REQ_READ 0x06 95 #define VND_READ_DATA 0x07 96 #define VND_REQ_WRITE 0x08 97 98 #define VND_CMD_START 0x00 99 #define VND_CMD_STOP 0x01 100 #define VND_CMD_RESET 0x09 101 102 #define VND_CMD_ERASE 0x1A 103 104 #define VND_GET_CHECKSUM 0x66 105 106 #define VND_SET_DATA 0x83 107 #define VND_SET_COMMAND_DATA 0x84 108 #define VND_SET_CHECKSUM_CALC 0x86 109 #define VND_SET_CHECKSUM_LENGTH 0x87 110 111 #define VND_CMD_SFLCK 0xFC 112 #define VND_CMD_SFUNL 0xFD 113 114 #define CMD_SFLCK_KEY 0xC39B 115 #define CMD_SFUNL_KEY 0x95DA 116 117 #define STRIDX_PLATFORM_ID 0x80 118 #define STRIDX_PARAMETERS 0x81 119 120 #define CMD_BUF_SIZE 8 121 #define PKT_BUF_SIZE 64 122 123 /* The definition of the command packet */ 124 #define CMD_REPORT_ID_OFFSET 0x0 125 #define CMD_TYPE_OFFSET 0x1 126 #define CMD_INDEX_OFFSET 0x2 127 #define CMD_KEY_OFFSET 0x3 128 #define CMD_LENGTH_OFFSET 0x4 129 #define CMD_DATA_OFFSET 0x8 130 131 /* The definition of firmware chunk tags */ 132 #define FOURCC_ID_RIFF 0x46464952 133 #define FOURCC_ID_WHIF 0x46494857 134 #define FOURCC_ID_FRMT 0x544D5246 135 #define FOURCC_ID_FRWR 0x52575246 136 #define FOURCC_ID_CNFG 0x47464E43 137 138 #define CHUNK_ID_FRMT FOURCC_ID_FRMT 139 #define CHUNK_ID_FRWR FOURCC_ID_FRWR 140 #define CHUNK_ID_CNFG FOURCC_ID_CNFG 141 142 #define FW_FOURCC1_OFFSET 0 143 #define FW_SIZE_OFFSET 4 144 #define FW_FOURCC2_OFFSET 8 145 #define FW_PAYLOAD_OFFSET 40 146 147 #define FW_CHUNK_ID_OFFSET 0 148 #define FW_CHUNK_SIZE_OFFSET 4 149 #define FW_CHUNK_TGT_START_OFFSET 8 150 #define FW_CHUNK_PAYLOAD_LEN_OFFSET 12 151 #define FW_CHUNK_SRC_START_OFFSET 16 152 #define FW_CHUNK_VERSION_OFFSET 20 153 #define FW_CHUNK_ATTR_OFFSET 24 154 #define FW_CHUNK_PAYLOAD_OFFSET 32 155 156 /* Controller requires minimum 300us between commands */ 157 #define WDT_COMMAND_DELAY_MS 2 158 #define WDT_FLASH_WRITE_DELAY_MS 4 159 #define WDT_FLASH_ERASE_DELAY_MS 200 160 #define WDT_FW_RESET_TIME 2500 161 162 struct wdt87xx_sys_param { 163 u16 fw_id; 164 u16 plat_id; 165 u16 xmls_id1; 166 u16 xmls_id2; 167 u16 phy_ch_x; 168 u16 phy_ch_y; 169 u16 phy_w; 170 u16 phy_h; 171 u16 scaling_factor; 172 u32 max_x; 173 u32 max_y; 174 u16 vendor_id; 175 u16 product_id; 176 }; 177 178 struct wdt87xx_data { 179 struct i2c_client *client; 180 struct input_dev *input; 181 /* Mutex for fw update to prevent concurrent access */ 182 struct mutex fw_mutex; 183 struct wdt87xx_sys_param param; 184 u8 phys[32]; 185 }; 186 187 static int wdt87xx_i2c_xfer(struct i2c_client *client, 188 void *txdata, size_t txlen, 189 void *rxdata, size_t rxlen) 190 { 191 struct i2c_msg msgs[] = { 192 { 193 .addr = client->addr, 194 .flags = 0, 195 .len = txlen, 196 .buf = txdata, 197 }, 198 { 199 .addr = client->addr, 200 .flags = I2C_M_RD, 201 .len = rxlen, 202 .buf = rxdata, 203 }, 204 }; 205 int error; 206 int ret; 207 208 ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs)); 209 if (ret != ARRAY_SIZE(msgs)) { 210 error = ret < 0 ? ret : -EIO; 211 dev_err(&client->dev, "%s: i2c transfer failed: %d\n", 212 __func__, error); 213 return error; 214 } 215 216 return 0; 217 } 218 219 static int wdt87xx_get_desc(struct i2c_client *client, u8 desc_idx, 220 u8 *buf, size_t len) 221 { 222 u8 tx_buf[] = { 0x22, 0x00, 0x10, 0x0E, 0x23, 0x00 }; 223 int error; 224 225 tx_buf[2] |= desc_idx & 0xF; 226 227 error = wdt87xx_i2c_xfer(client, tx_buf, sizeof(tx_buf), 228 buf, len); 229 if (error) { 230 dev_err(&client->dev, "get desc failed: %d\n", error); 231 return error; 232 } 233 234 if (buf[0] != len) { 235 dev_err(&client->dev, "unexpected response to get desc: %d\n", 236 buf[0]); 237 return -EINVAL; 238 } 239 240 mdelay(WDT_COMMAND_DELAY_MS); 241 242 return 0; 243 } 244 245 static int wdt87xx_get_string(struct i2c_client *client, u8 str_idx, 246 u8 *buf, size_t len) 247 { 248 u8 tx_buf[] = { 0x22, 0x00, 0x13, 0x0E, str_idx, 0x23, 0x00 }; 249 u8 rx_buf[PKT_WRITE_SIZE]; 250 size_t rx_len = len + 2; 251 int error; 252 253 if (rx_len > sizeof(rx_buf)) 254 return -EINVAL; 255 256 error = wdt87xx_i2c_xfer(client, tx_buf, sizeof(tx_buf), 257 rx_buf, rx_len); 258 if (error) { 259 dev_err(&client->dev, "get string failed: %d\n", error); 260 return error; 261 } 262 263 if (rx_buf[1] != 0x03) { 264 dev_err(&client->dev, "unexpected response to get string: %d\n", 265 rx_buf[1]); 266 return -EINVAL; 267 } 268 269 rx_len = min_t(size_t, len, rx_buf[0]); 270 memcpy(buf, &rx_buf[2], rx_len); 271 272 mdelay(WDT_COMMAND_DELAY_MS); 273 274 return 0; 275 } 276 277 static int wdt87xx_get_feature(struct i2c_client *client, 278 u8 *buf, size_t buf_size) 279 { 280 u8 tx_buf[8]; 281 u8 rx_buf[PKT_WRITE_SIZE]; 282 size_t tx_len = 0; 283 size_t rx_len = buf_size + 2; 284 int error; 285 286 if (rx_len > sizeof(rx_buf)) 287 return -EINVAL; 288 289 /* Get feature command packet */ 290 tx_buf[tx_len++] = 0x22; 291 tx_buf[tx_len++] = 0x00; 292 if (buf[CMD_REPORT_ID_OFFSET] > 0xF) { 293 tx_buf[tx_len++] = 0x30; 294 tx_buf[tx_len++] = 0x02; 295 tx_buf[tx_len++] = buf[CMD_REPORT_ID_OFFSET]; 296 } else { 297 tx_buf[tx_len++] = 0x30 | buf[CMD_REPORT_ID_OFFSET]; 298 tx_buf[tx_len++] = 0x02; 299 } 300 tx_buf[tx_len++] = 0x23; 301 tx_buf[tx_len++] = 0x00; 302 303 error = wdt87xx_i2c_xfer(client, tx_buf, tx_len, rx_buf, rx_len); 304 if (error) { 305 dev_err(&client->dev, "get feature failed: %d\n", error); 306 return error; 307 } 308 309 rx_len = min_t(size_t, buf_size, get_unaligned_le16(rx_buf)); 310 memcpy(buf, &rx_buf[2], rx_len); 311 312 mdelay(WDT_COMMAND_DELAY_MS); 313 314 return 0; 315 } 316 317 static int wdt87xx_set_feature(struct i2c_client *client, 318 const u8 *buf, size_t buf_size) 319 { 320 u8 tx_buf[PKT_WRITE_SIZE]; 321 int tx_len = 0; 322 int error; 323 324 /* Set feature command packet */ 325 tx_buf[tx_len++] = 0x22; 326 tx_buf[tx_len++] = 0x00; 327 if (buf[CMD_REPORT_ID_OFFSET] > 0xF) { 328 tx_buf[tx_len++] = 0x30; 329 tx_buf[tx_len++] = 0x03; 330 tx_buf[tx_len++] = buf[CMD_REPORT_ID_OFFSET]; 331 } else { 332 tx_buf[tx_len++] = 0x30 | buf[CMD_REPORT_ID_OFFSET]; 333 tx_buf[tx_len++] = 0x03; 334 } 335 tx_buf[tx_len++] = 0x23; 336 tx_buf[tx_len++] = 0x00; 337 tx_buf[tx_len++] = (buf_size & 0xFF); 338 tx_buf[tx_len++] = ((buf_size & 0xFF00) >> 8); 339 340 if (tx_len + buf_size > sizeof(tx_buf)) 341 return -EINVAL; 342 343 memcpy(&tx_buf[tx_len], buf, buf_size); 344 tx_len += buf_size; 345 346 error = i2c_master_send(client, tx_buf, tx_len); 347 if (error < 0) { 348 dev_err(&client->dev, "set feature failed: %d\n", error); 349 return error; 350 } 351 352 mdelay(WDT_COMMAND_DELAY_MS); 353 354 return 0; 355 } 356 357 static int wdt87xx_send_command(struct i2c_client *client, int cmd, int value) 358 { 359 u8 cmd_buf[CMD_BUF_SIZE]; 360 361 /* Set the command packet */ 362 cmd_buf[CMD_REPORT_ID_OFFSET] = VND_REQ_WRITE; 363 cmd_buf[CMD_TYPE_OFFSET] = VND_SET_COMMAND_DATA; 364 put_unaligned_le16((u16)cmd, &cmd_buf[CMD_INDEX_OFFSET]); 365 366 switch (cmd) { 367 case VND_CMD_START: 368 case VND_CMD_STOP: 369 case VND_CMD_RESET: 370 /* Mode selector */ 371 put_unaligned_le32((value & 0xFF), &cmd_buf[CMD_LENGTH_OFFSET]); 372 break; 373 374 case VND_CMD_SFLCK: 375 put_unaligned_le16(CMD_SFLCK_KEY, &cmd_buf[CMD_KEY_OFFSET]); 376 break; 377 378 case VND_CMD_SFUNL: 379 put_unaligned_le16(CMD_SFUNL_KEY, &cmd_buf[CMD_KEY_OFFSET]); 380 break; 381 382 case VND_CMD_ERASE: 383 case VND_SET_CHECKSUM_CALC: 384 case VND_SET_CHECKSUM_LENGTH: 385 put_unaligned_le32(value, &cmd_buf[CMD_KEY_OFFSET]); 386 break; 387 388 default: 389 cmd_buf[CMD_REPORT_ID_OFFSET] = 0; 390 dev_err(&client->dev, "Invalid command: %d\n", cmd); 391 return -EINVAL; 392 } 393 394 return wdt87xx_set_feature(client, cmd_buf, sizeof(cmd_buf)); 395 } 396 397 static int wdt87xx_sw_reset(struct i2c_client *client) 398 { 399 int error; 400 401 dev_dbg(&client->dev, "resetting device now\n"); 402 403 error = wdt87xx_send_command(client, VND_CMD_RESET, 0); 404 if (error) { 405 dev_err(&client->dev, "reset failed\n"); 406 return error; 407 } 408 409 /* Wait the device to be ready */ 410 msleep(WDT_FW_RESET_TIME); 411 412 return 0; 413 } 414 415 static const void *wdt87xx_get_fw_chunk(const struct firmware *fw, u32 id) 416 { 417 size_t pos = FW_PAYLOAD_OFFSET; 418 u32 chunk_id, chunk_size; 419 420 while (pos < fw->size) { 421 chunk_id = get_unaligned_le32(fw->data + 422 pos + FW_CHUNK_ID_OFFSET); 423 if (chunk_id == id) 424 return fw->data + pos; 425 426 chunk_size = get_unaligned_le32(fw->data + 427 pos + FW_CHUNK_SIZE_OFFSET); 428 pos += chunk_size + 2 * sizeof(u32); /* chunk ID + size */ 429 } 430 431 return NULL; 432 } 433 434 static int wdt87xx_get_sysparam(struct i2c_client *client, 435 struct wdt87xx_sys_param *param) 436 { 437 u8 buf[PKT_READ_SIZE]; 438 int error; 439 440 error = wdt87xx_get_desc(client, WDT_GD_DEVICE, buf, 18); 441 if (error) { 442 dev_err(&client->dev, "failed to get device desc\n"); 443 return error; 444 } 445 446 param->vendor_id = get_unaligned_le16(buf + DEV_DESC_OFFSET_VID); 447 param->product_id = get_unaligned_le16(buf + DEV_DESC_OFFSET_PID); 448 449 error = wdt87xx_get_string(client, STRIDX_PARAMETERS, buf, 34); 450 if (error) { 451 dev_err(&client->dev, "failed to get parameters\n"); 452 return error; 453 } 454 455 param->xmls_id1 = get_unaligned_le16(buf + CTL_PARAM_OFFSET_XMLS_ID1); 456 param->xmls_id2 = get_unaligned_le16(buf + CTL_PARAM_OFFSET_XMLS_ID2); 457 param->phy_ch_x = get_unaligned_le16(buf + CTL_PARAM_OFFSET_PHY_CH_X); 458 param->phy_ch_y = get_unaligned_le16(buf + CTL_PARAM_OFFSET_PHY_CH_Y); 459 param->phy_w = get_unaligned_le16(buf + CTL_PARAM_OFFSET_PHY_W) / 10; 460 param->phy_h = get_unaligned_le16(buf + CTL_PARAM_OFFSET_PHY_H) / 10; 461 462 /* Get the scaling factor of pixel to logical coordinate */ 463 param->scaling_factor = 464 get_unaligned_le16(buf + CTL_PARAM_OFFSET_FACTOR); 465 466 param->max_x = MAX_UNIT_AXIS; 467 param->max_y = DIV_ROUND_CLOSEST(MAX_UNIT_AXIS * param->phy_h, 468 param->phy_w); 469 470 error = wdt87xx_get_string(client, STRIDX_PLATFORM_ID, buf, 8); 471 if (error) { 472 dev_err(&client->dev, "failed to get platform id\n"); 473 return error; 474 } 475 476 param->plat_id = buf[1]; 477 478 buf[0] = 0xf2; 479 error = wdt87xx_get_feature(client, buf, 16); 480 if (error) { 481 dev_err(&client->dev, "failed to get firmware id\n"); 482 return error; 483 } 484 485 if (buf[0] != 0xf2) { 486 dev_err(&client->dev, "wrong id of fw response: 0x%x\n", 487 buf[0]); 488 return -EINVAL; 489 } 490 491 param->fw_id = get_unaligned_le16(&buf[1]); 492 493 dev_info(&client->dev, 494 "fw_id: 0x%x, plat_id: 0x%x, xml_id1: %04x, xml_id2: %04x\n", 495 param->fw_id, param->plat_id, 496 param->xmls_id1, param->xmls_id2); 497 498 return 0; 499 } 500 501 static int wdt87xx_validate_firmware(struct wdt87xx_data *wdt, 502 const struct firmware *fw) 503 { 504 const void *fw_chunk; 505 u32 data1, data2; 506 u32 size; 507 u8 fw_chip_id; 508 u8 chip_id; 509 510 data1 = get_unaligned_le32(fw->data + FW_FOURCC1_OFFSET); 511 data2 = get_unaligned_le32(fw->data + FW_FOURCC2_OFFSET); 512 if (data1 != FOURCC_ID_RIFF || data2 != FOURCC_ID_WHIF) { 513 dev_err(&wdt->client->dev, "check fw tag failed\n"); 514 return -EINVAL; 515 } 516 517 size = get_unaligned_le32(fw->data + FW_SIZE_OFFSET); 518 if (size != fw->size) { 519 dev_err(&wdt->client->dev, 520 "fw size mismatch: expected %d, actual %zu\n", 521 size, fw->size); 522 return -EINVAL; 523 } 524 525 /* 526 * Get the chip_id from the firmware. Make sure that it is the 527 * right controller to do the firmware and config update. 528 */ 529 fw_chunk = wdt87xx_get_fw_chunk(fw, CHUNK_ID_FRWR); 530 if (!fw_chunk) { 531 dev_err(&wdt->client->dev, 532 "unable to locate firmware chunk\n"); 533 return -EINVAL; 534 } 535 536 fw_chip_id = (get_unaligned_le32(fw_chunk + 537 FW_CHUNK_VERSION_OFFSET) >> 12) & 0xF; 538 chip_id = (wdt->param.fw_id >> 12) & 0xF; 539 540 if (fw_chip_id != chip_id) { 541 dev_err(&wdt->client->dev, 542 "fw version mismatch: fw %d vs. chip %d\n", 543 fw_chip_id, chip_id); 544 return -ENODEV; 545 } 546 547 return 0; 548 } 549 550 static int wdt87xx_validate_fw_chunk(const void *data, int id) 551 { 552 if (id == CHUNK_ID_FRWR) { 553 u32 fw_id; 554 555 fw_id = get_unaligned_le32(data + FW_CHUNK_PAYLOAD_OFFSET); 556 if (fw_id != WDT_FIRMWARE_ID) 557 return -EINVAL; 558 } 559 560 return 0; 561 } 562 563 static int wdt87xx_write_data(struct i2c_client *client, const char *data, 564 u32 address, int length) 565 { 566 u16 packet_size; 567 int count = 0; 568 int error; 569 u8 pkt_buf[PKT_BUF_SIZE]; 570 571 /* Address and length should be 4 bytes aligned */ 572 if ((address & 0x3) != 0 || (length & 0x3) != 0) { 573 dev_err(&client->dev, 574 "addr & len must be 4 bytes aligned %x, %x\n", 575 address, length); 576 return -EINVAL; 577 } 578 579 while (length) { 580 packet_size = min(length, PACKET_SIZE); 581 582 pkt_buf[CMD_REPORT_ID_OFFSET] = VND_REQ_WRITE; 583 pkt_buf[CMD_TYPE_OFFSET] = VND_SET_DATA; 584 put_unaligned_le16(packet_size, &pkt_buf[CMD_INDEX_OFFSET]); 585 put_unaligned_le32(address, &pkt_buf[CMD_LENGTH_OFFSET]); 586 memcpy(&pkt_buf[CMD_DATA_OFFSET], data, packet_size); 587 588 error = wdt87xx_set_feature(client, pkt_buf, sizeof(pkt_buf)); 589 if (error) 590 return error; 591 592 length -= packet_size; 593 data += packet_size; 594 address += packet_size; 595 596 /* Wait for the controller to finish the write */ 597 mdelay(WDT_FLASH_WRITE_DELAY_MS); 598 599 if ((++count % 32) == 0) { 600 /* Delay for fw to clear watch dog */ 601 msleep(20); 602 } 603 } 604 605 return 0; 606 } 607 608 static u16 misr(u16 cur_value, u8 new_value) 609 { 610 u32 a, b; 611 u32 bit0; 612 u32 y; 613 614 a = cur_value; 615 b = new_value; 616 bit0 = a ^ (b & 1); 617 bit0 ^= a >> 1; 618 bit0 ^= a >> 2; 619 bit0 ^= a >> 4; 620 bit0 ^= a >> 5; 621 bit0 ^= a >> 7; 622 bit0 ^= a >> 11; 623 bit0 ^= a >> 15; 624 y = (a << 1) ^ b; 625 y = (y & ~1) | (bit0 & 1); 626 627 return (u16)y; 628 } 629 630 static u16 wdt87xx_calculate_checksum(const u8 *data, size_t length) 631 { 632 u16 checksum = 0; 633 size_t i; 634 635 for (i = 0; i < length; i++) 636 checksum = misr(checksum, data[i]); 637 638 return checksum; 639 } 640 641 static int wdt87xx_get_checksum(struct i2c_client *client, u16 *checksum, 642 u32 address, int length) 643 { 644 int error; 645 int time_delay; 646 u8 pkt_buf[PKT_BUF_SIZE]; 647 u8 cmd_buf[CMD_BUF_SIZE]; 648 649 error = wdt87xx_send_command(client, VND_SET_CHECKSUM_LENGTH, length); 650 if (error) { 651 dev_err(&client->dev, "failed to set checksum length\n"); 652 return error; 653 } 654 655 error = wdt87xx_send_command(client, VND_SET_CHECKSUM_CALC, address); 656 if (error) { 657 dev_err(&client->dev, "failed to set checksum address\n"); 658 return error; 659 } 660 661 /* Wait the operation to complete */ 662 time_delay = DIV_ROUND_UP(length, 1024); 663 msleep(time_delay * 30); 664 665 memset(cmd_buf, 0, sizeof(cmd_buf)); 666 cmd_buf[CMD_REPORT_ID_OFFSET] = VND_REQ_READ; 667 cmd_buf[CMD_TYPE_OFFSET] = VND_GET_CHECKSUM; 668 error = wdt87xx_set_feature(client, cmd_buf, sizeof(cmd_buf)); 669 if (error) { 670 dev_err(&client->dev, "failed to request checksum\n"); 671 return error; 672 } 673 674 memset(pkt_buf, 0, sizeof(pkt_buf)); 675 pkt_buf[CMD_REPORT_ID_OFFSET] = VND_READ_DATA; 676 error = wdt87xx_get_feature(client, pkt_buf, sizeof(pkt_buf)); 677 if (error) { 678 dev_err(&client->dev, "failed to read checksum\n"); 679 return error; 680 } 681 682 *checksum = get_unaligned_le16(&pkt_buf[CMD_DATA_OFFSET]); 683 return 0; 684 } 685 686 static int wdt87xx_write_firmware(struct i2c_client *client, const void *chunk) 687 { 688 u32 start_addr = get_unaligned_le32(chunk + FW_CHUNK_TGT_START_OFFSET); 689 u32 size = get_unaligned_le32(chunk + FW_CHUNK_PAYLOAD_LEN_OFFSET); 690 const void *data = chunk + FW_CHUNK_PAYLOAD_OFFSET; 691 int error; 692 int err1; 693 int page_size; 694 int retry = 0; 695 u16 device_checksum, firmware_checksum; 696 697 dev_dbg(&client->dev, "start 4k page program\n"); 698 699 error = wdt87xx_send_command(client, VND_CMD_STOP, MODE_STOP); 700 if (error) { 701 dev_err(&client->dev, "stop report mode failed\n"); 702 return error; 703 } 704 705 error = wdt87xx_send_command(client, VND_CMD_SFUNL, 0); 706 if (error) { 707 dev_err(&client->dev, "unlock failed\n"); 708 goto out_enable_reporting; 709 } 710 711 mdelay(10); 712 713 while (size) { 714 dev_dbg(&client->dev, "%s: %x, %x\n", __func__, 715 start_addr, size); 716 717 page_size = min_t(u32, size, PG_SIZE); 718 size -= page_size; 719 720 for (retry = 0; retry < MAX_RETRIES; retry++) { 721 error = wdt87xx_send_command(client, VND_CMD_ERASE, 722 start_addr); 723 if (error) { 724 dev_err(&client->dev, 725 "erase failed at %#08x\n", start_addr); 726 break; 727 } 728 729 msleep(WDT_FLASH_ERASE_DELAY_MS); 730 731 error = wdt87xx_write_data(client, data, start_addr, 732 page_size); 733 if (error) { 734 dev_err(&client->dev, 735 "write failed at %#08x (%d bytes)\n", 736 start_addr, page_size); 737 break; 738 } 739 740 error = wdt87xx_get_checksum(client, &device_checksum, 741 start_addr, page_size); 742 if (error) { 743 dev_err(&client->dev, 744 "failed to retrieve checksum for %#08x (len: %d)\n", 745 start_addr, page_size); 746 break; 747 } 748 749 firmware_checksum = 750 wdt87xx_calculate_checksum(data, page_size); 751 752 if (device_checksum == firmware_checksum) 753 break; 754 755 dev_err(&client->dev, 756 "checksum fail: %d vs %d, retry %d\n", 757 device_checksum, firmware_checksum, retry); 758 } 759 760 if (retry == MAX_RETRIES) { 761 dev_err(&client->dev, "page write failed\n"); 762 error = -EIO; 763 goto out_lock_device; 764 } 765 766 start_addr = start_addr + page_size; 767 data = data + page_size; 768 } 769 770 out_lock_device: 771 err1 = wdt87xx_send_command(client, VND_CMD_SFLCK, 0); 772 if (err1) 773 dev_err(&client->dev, "lock failed\n"); 774 775 mdelay(10); 776 777 out_enable_reporting: 778 err1 = wdt87xx_send_command(client, VND_CMD_START, 0); 779 if (err1) 780 dev_err(&client->dev, "start to report failed\n"); 781 782 return error ? error : err1; 783 } 784 785 static int wdt87xx_load_chunk(struct i2c_client *client, 786 const struct firmware *fw, u32 ck_id) 787 { 788 const void *chunk; 789 int error; 790 791 chunk = wdt87xx_get_fw_chunk(fw, ck_id); 792 if (!chunk) { 793 dev_err(&client->dev, "unable to locate chunk (type %d)\n", 794 ck_id); 795 return -EINVAL; 796 } 797 798 error = wdt87xx_validate_fw_chunk(chunk, ck_id); 799 if (error) { 800 dev_err(&client->dev, "invalid chunk (type %d): %d\n", 801 ck_id, error); 802 return error; 803 } 804 805 error = wdt87xx_write_firmware(client, chunk); 806 if (error) { 807 dev_err(&client->dev, 808 "failed to write fw chunk (type %d): %d\n", 809 ck_id, error); 810 return error; 811 } 812 813 return 0; 814 } 815 816 static int wdt87xx_do_update_firmware(struct i2c_client *client, 817 const struct firmware *fw, 818 unsigned int chunk_id) 819 { 820 struct wdt87xx_data *wdt = i2c_get_clientdata(client); 821 int error; 822 823 error = wdt87xx_validate_firmware(wdt, fw); 824 if (error) 825 return error; 826 827 error = mutex_lock_interruptible(&wdt->fw_mutex); 828 if (error) 829 return error; 830 831 disable_irq(client->irq); 832 833 error = wdt87xx_load_chunk(client, fw, chunk_id); 834 if (error) { 835 dev_err(&client->dev, 836 "firmware load failed (type: %d): %d\n", 837 chunk_id, error); 838 goto out; 839 } 840 841 error = wdt87xx_sw_reset(client); 842 if (error) { 843 dev_err(&client->dev, "soft reset failed: %d\n", error); 844 goto out; 845 } 846 847 /* Refresh the parameters */ 848 error = wdt87xx_get_sysparam(client, &wdt->param); 849 if (error) 850 dev_err(&client->dev, 851 "failed to refresh system parameters: %d\n", error); 852 out: 853 enable_irq(client->irq); 854 mutex_unlock(&wdt->fw_mutex); 855 856 return error ? error : 0; 857 } 858 859 static int wdt87xx_update_firmware(struct device *dev, 860 const char *fw_name, unsigned int chunk_id) 861 { 862 struct i2c_client *client = to_i2c_client(dev); 863 const struct firmware *fw; 864 int error; 865 866 error = request_firmware(&fw, fw_name, dev); 867 if (error) { 868 dev_err(&client->dev, "unable to retrieve firmware %s: %d\n", 869 fw_name, error); 870 return error; 871 } 872 873 error = wdt87xx_do_update_firmware(client, fw, chunk_id); 874 875 release_firmware(fw); 876 877 return error ? error : 0; 878 } 879 880 static ssize_t config_csum_show(struct device *dev, 881 struct device_attribute *attr, char *buf) 882 { 883 struct i2c_client *client = to_i2c_client(dev); 884 struct wdt87xx_data *wdt = i2c_get_clientdata(client); 885 u32 cfg_csum; 886 887 cfg_csum = wdt->param.xmls_id1; 888 cfg_csum = (cfg_csum << 16) | wdt->param.xmls_id2; 889 890 return scnprintf(buf, PAGE_SIZE, "%x\n", cfg_csum); 891 } 892 893 static ssize_t fw_version_show(struct device *dev, 894 struct device_attribute *attr, char *buf) 895 { 896 struct i2c_client *client = to_i2c_client(dev); 897 struct wdt87xx_data *wdt = i2c_get_clientdata(client); 898 899 return scnprintf(buf, PAGE_SIZE, "%x\n", wdt->param.fw_id); 900 } 901 902 static ssize_t plat_id_show(struct device *dev, 903 struct device_attribute *attr, char *buf) 904 { 905 struct i2c_client *client = to_i2c_client(dev); 906 struct wdt87xx_data *wdt = i2c_get_clientdata(client); 907 908 return scnprintf(buf, PAGE_SIZE, "%x\n", wdt->param.plat_id); 909 } 910 911 static ssize_t update_config_store(struct device *dev, 912 struct device_attribute *attr, 913 const char *buf, size_t count) 914 { 915 int error; 916 917 error = wdt87xx_update_firmware(dev, WDT87XX_CFG_NAME, CHUNK_ID_CNFG); 918 919 return error ? error : count; 920 } 921 922 static ssize_t update_fw_store(struct device *dev, 923 struct device_attribute *attr, 924 const char *buf, size_t count) 925 { 926 int error; 927 928 error = wdt87xx_update_firmware(dev, WDT87XX_FW_NAME, CHUNK_ID_FRWR); 929 930 return error ? error : count; 931 } 932 933 static DEVICE_ATTR_RO(config_csum); 934 static DEVICE_ATTR_RO(fw_version); 935 static DEVICE_ATTR_RO(plat_id); 936 static DEVICE_ATTR_WO(update_config); 937 static DEVICE_ATTR_WO(update_fw); 938 939 static struct attribute *wdt87xx_attrs[] = { 940 &dev_attr_config_csum.attr, 941 &dev_attr_fw_version.attr, 942 &dev_attr_plat_id.attr, 943 &dev_attr_update_config.attr, 944 &dev_attr_update_fw.attr, 945 NULL 946 }; 947 ATTRIBUTE_GROUPS(wdt87xx); 948 949 static void wdt87xx_report_contact(struct input_dev *input, 950 struct wdt87xx_sys_param *param, 951 u8 *buf) 952 { 953 int finger_id; 954 u32 x, y, w; 955 u8 p; 956 957 finger_id = (buf[FINGER_EV_V1_OFFSET_ID] >> 3) - 1; 958 if (finger_id < 0) 959 return; 960 961 /* Check if this is an active contact */ 962 if (!(buf[FINGER_EV_V1_OFFSET_ID] & 0x1)) 963 return; 964 965 w = buf[FINGER_EV_V1_OFFSET_W]; 966 w *= param->scaling_factor; 967 968 p = buf[FINGER_EV_V1_OFFSET_P]; 969 970 x = get_unaligned_le16(buf + FINGER_EV_V1_OFFSET_X); 971 972 y = get_unaligned_le16(buf + FINGER_EV_V1_OFFSET_Y); 973 y = DIV_ROUND_CLOSEST(y * param->phy_h, param->phy_w); 974 975 /* Refuse incorrect coordinates */ 976 if (x > param->max_x || y > param->max_y) 977 return; 978 979 dev_dbg(input->dev.parent, "tip on (%d), x(%d), y(%d)\n", 980 finger_id, x, y); 981 982 input_mt_slot(input, finger_id); 983 input_mt_report_slot_state(input, MT_TOOL_FINGER, 1); 984 input_report_abs(input, ABS_MT_TOUCH_MAJOR, w); 985 input_report_abs(input, ABS_MT_PRESSURE, p); 986 input_report_abs(input, ABS_MT_POSITION_X, x); 987 input_report_abs(input, ABS_MT_POSITION_Y, y); 988 } 989 990 static irqreturn_t wdt87xx_ts_interrupt(int irq, void *dev_id) 991 { 992 struct wdt87xx_data *wdt = dev_id; 993 struct i2c_client *client = wdt->client; 994 int i, fingers; 995 int error; 996 u8 raw_buf[WDT_V1_RAW_BUF_COUNT] = {0}; 997 998 error = i2c_master_recv(client, raw_buf, WDT_V1_RAW_BUF_COUNT); 999 if (error < 0) { 1000 dev_err(&client->dev, "read v1 raw data failed: %d\n", error); 1001 goto irq_exit; 1002 } 1003 1004 fingers = raw_buf[TOUCH_PK_V1_OFFSET_FNGR_NUM]; 1005 if (!fingers) 1006 goto irq_exit; 1007 1008 for (i = 0; i < WDT_MAX_FINGER; i++) 1009 wdt87xx_report_contact(wdt->input, 1010 &wdt->param, 1011 &raw_buf[TOUCH_PK_V1_OFFSET_EVENT + 1012 i * FINGER_EV_V1_SIZE]); 1013 1014 input_mt_sync_frame(wdt->input); 1015 input_sync(wdt->input); 1016 1017 irq_exit: 1018 return IRQ_HANDLED; 1019 } 1020 1021 static int wdt87xx_ts_create_input_device(struct wdt87xx_data *wdt) 1022 { 1023 struct device *dev = &wdt->client->dev; 1024 struct input_dev *input; 1025 unsigned int res = DIV_ROUND_CLOSEST(MAX_UNIT_AXIS, wdt->param.phy_w); 1026 int error; 1027 1028 input = devm_input_allocate_device(dev); 1029 if (!input) { 1030 dev_err(dev, "failed to allocate input device\n"); 1031 return -ENOMEM; 1032 } 1033 wdt->input = input; 1034 1035 input->name = "WDT87xx Touchscreen"; 1036 input->id.bustype = BUS_I2C; 1037 input->id.vendor = wdt->param.vendor_id; 1038 input->id.product = wdt->param.product_id; 1039 input->phys = wdt->phys; 1040 1041 input_set_abs_params(input, ABS_MT_POSITION_X, 0, 1042 wdt->param.max_x, 0, 0); 1043 input_set_abs_params(input, ABS_MT_POSITION_Y, 0, 1044 wdt->param.max_y, 0, 0); 1045 input_abs_set_res(input, ABS_MT_POSITION_X, res); 1046 input_abs_set_res(input, ABS_MT_POSITION_Y, res); 1047 1048 input_set_abs_params(input, ABS_MT_TOUCH_MAJOR, 1049 0, wdt->param.max_x, 0, 0); 1050 input_set_abs_params(input, ABS_MT_PRESSURE, 0, 0xFF, 0, 0); 1051 1052 input_mt_init_slots(input, WDT_MAX_FINGER, 1053 INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED); 1054 1055 error = input_register_device(input); 1056 if (error) { 1057 dev_err(dev, "failed to register input device: %d\n", error); 1058 return error; 1059 } 1060 1061 return 0; 1062 } 1063 1064 static int wdt87xx_ts_probe(struct i2c_client *client) 1065 { 1066 struct wdt87xx_data *wdt; 1067 int error; 1068 1069 dev_dbg(&client->dev, "adapter=%d, client irq: %d\n", 1070 client->adapter->nr, client->irq); 1071 1072 /* Check if the I2C function is ok in this adaptor */ 1073 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) 1074 return -ENXIO; 1075 1076 wdt = devm_kzalloc(&client->dev, sizeof(*wdt), GFP_KERNEL); 1077 if (!wdt) 1078 return -ENOMEM; 1079 1080 wdt->client = client; 1081 mutex_init(&wdt->fw_mutex); 1082 i2c_set_clientdata(client, wdt); 1083 1084 snprintf(wdt->phys, sizeof(wdt->phys), "i2c-%u-%04x/input0", 1085 client->adapter->nr, client->addr); 1086 1087 error = wdt87xx_get_sysparam(client, &wdt->param); 1088 if (error) 1089 return error; 1090 1091 error = wdt87xx_ts_create_input_device(wdt); 1092 if (error) 1093 return error; 1094 1095 error = devm_request_threaded_irq(&client->dev, client->irq, 1096 NULL, wdt87xx_ts_interrupt, 1097 IRQF_ONESHOT, 1098 client->name, wdt); 1099 if (error) { 1100 dev_err(&client->dev, "request irq failed: %d\n", error); 1101 return error; 1102 } 1103 1104 return 0; 1105 } 1106 1107 static int wdt87xx_suspend(struct device *dev) 1108 { 1109 struct i2c_client *client = to_i2c_client(dev); 1110 int error; 1111 1112 disable_irq(client->irq); 1113 1114 error = wdt87xx_send_command(client, VND_CMD_STOP, MODE_IDLE); 1115 if (error) { 1116 enable_irq(client->irq); 1117 dev_err(&client->dev, 1118 "failed to stop device when suspending: %d\n", 1119 error); 1120 return error; 1121 } 1122 1123 return 0; 1124 } 1125 1126 static int wdt87xx_resume(struct device *dev) 1127 { 1128 struct i2c_client *client = to_i2c_client(dev); 1129 int error; 1130 1131 /* 1132 * The chip may have been reset while system is resuming, 1133 * give it some time to settle. 1134 */ 1135 msleep(100); 1136 1137 error = wdt87xx_send_command(client, VND_CMD_START, 0); 1138 if (error) 1139 dev_err(&client->dev, 1140 "failed to start device when resuming: %d\n", 1141 error); 1142 1143 enable_irq(client->irq); 1144 1145 return 0; 1146 } 1147 1148 static DEFINE_SIMPLE_DEV_PM_OPS(wdt87xx_pm_ops, wdt87xx_suspend, wdt87xx_resume); 1149 1150 static const struct i2c_device_id wdt87xx_dev_id[] = { 1151 { WDT87XX_NAME, 0 }, 1152 { } 1153 }; 1154 MODULE_DEVICE_TABLE(i2c, wdt87xx_dev_id); 1155 1156 static const struct acpi_device_id wdt87xx_acpi_id[] = { 1157 { "WDHT0001", 0 }, 1158 { } 1159 }; 1160 MODULE_DEVICE_TABLE(acpi, wdt87xx_acpi_id); 1161 1162 static struct i2c_driver wdt87xx_driver = { 1163 .probe = wdt87xx_ts_probe, 1164 .id_table = wdt87xx_dev_id, 1165 .driver = { 1166 .name = WDT87XX_NAME, 1167 .dev_groups = wdt87xx_groups, 1168 .pm = pm_sleep_ptr(&wdt87xx_pm_ops), 1169 .acpi_match_table = ACPI_PTR(wdt87xx_acpi_id), 1170 }, 1171 }; 1172 module_i2c_driver(wdt87xx_driver); 1173 1174 MODULE_AUTHOR("HN Chen <hn.chen@weidahitech.com>"); 1175 MODULE_DESCRIPTION("WeidaHiTech WDT87XX Touchscreen driver"); 1176 MODULE_LICENSE("GPL"); 1177