1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * MELFAS MIP4 Touchscreen 4 * 5 * Copyright (C) 2016 MELFAS Inc. 6 * 7 * Author : Sangwon Jee <jeesw@melfas.com> 8 */ 9 10 #include <linux/acpi.h> 11 #include <linux/delay.h> 12 #include <linux/firmware.h> 13 #include <linux/gpio/consumer.h> 14 #include <linux/i2c.h> 15 #include <linux/input.h> 16 #include <linux/input/mt.h> 17 #include <linux/interrupt.h> 18 #include <linux/module.h> 19 #include <linux/of.h> 20 #include <linux/slab.h> 21 #include <linux/unaligned.h> 22 23 #define MIP4_DEVICE_NAME "mip4_ts" 24 25 /***************************************************************** 26 * Protocol 27 * Version : MIP 4.0 Rev 5.4 28 *****************************************************************/ 29 30 /* Address */ 31 #define MIP4_R0_BOOT 0x00 32 #define MIP4_R1_BOOT_MODE 0x01 33 #define MIP4_R1_BOOT_BUF_ADDR 0x10 34 #define MIP4_R1_BOOT_STATUS 0x20 35 #define MIP4_R1_BOOT_CMD 0x30 36 #define MIP4_R1_BOOT_TARGET_ADDR 0x40 37 #define MIP4_R1_BOOT_SIZE 0x44 38 39 #define MIP4_R0_INFO 0x01 40 #define MIP4_R1_INFO_PRODUCT_NAME 0x00 41 #define MIP4_R1_INFO_RESOLUTION_X 0x10 42 #define MIP4_R1_INFO_RESOLUTION_Y 0x12 43 #define MIP4_R1_INFO_NODE_NUM_X 0x14 44 #define MIP4_R1_INFO_NODE_NUM_Y 0x15 45 #define MIP4_R1_INFO_KEY_NUM 0x16 46 #define MIP4_R1_INFO_PRESSURE_NUM 0x17 47 #define MIP4_R1_INFO_LENGTH_X 0x18 48 #define MIP4_R1_INFO_LENGTH_Y 0x1A 49 #define MIP4_R1_INFO_PPM_X 0x1C 50 #define MIP4_R1_INFO_PPM_Y 0x1D 51 #define MIP4_R1_INFO_VERSION_BOOT 0x20 52 #define MIP4_R1_INFO_VERSION_CORE 0x22 53 #define MIP4_R1_INFO_VERSION_APP 0x24 54 #define MIP4_R1_INFO_VERSION_PARAM 0x26 55 #define MIP4_R1_INFO_SECT_BOOT_START 0x30 56 #define MIP4_R1_INFO_SECT_BOOT_END 0x31 57 #define MIP4_R1_INFO_SECT_CORE_START 0x32 58 #define MIP4_R1_INFO_SECT_CORE_END 0x33 59 #define MIP4_R1_INFO_SECT_APP_START 0x34 60 #define MIP4_R1_INFO_SECT_APP_END 0x35 61 #define MIP4_R1_INFO_SECT_PARAM_START 0x36 62 #define MIP4_R1_INFO_SECT_PARAM_END 0x37 63 #define MIP4_R1_INFO_BUILD_DATE 0x40 64 #define MIP4_R1_INFO_BUILD_TIME 0x44 65 #define MIP4_R1_INFO_CHECKSUM_PRECALC 0x48 66 #define MIP4_R1_INFO_CHECKSUM_REALTIME 0x4A 67 #define MIP4_R1_INFO_PROTOCOL_NAME 0x50 68 #define MIP4_R1_INFO_PROTOCOL_VERSION 0x58 69 #define MIP4_R1_INFO_IC_ID 0x70 70 #define MIP4_R1_INFO_IC_NAME 0x71 71 #define MIP4_R1_INFO_IC_VENDOR_ID 0x75 72 #define MIP4_R1_INFO_IC_HW_CATEGORY 0x77 73 #define MIP4_R1_INFO_CONTACT_THD_SCR 0x78 74 #define MIP4_R1_INFO_CONTACT_THD_KEY 0x7A 75 #define MIP4_R1_INFO_PID 0x7C 76 #define MIP4_R1_INFO_VID 0x7E 77 #define MIP4_R1_INFO_SLAVE_ADDR 0x80 78 79 #define MIP4_R0_EVENT 0x02 80 #define MIP4_R1_EVENT_SUPPORTED_FUNC 0x00 81 #define MIP4_R1_EVENT_FORMAT 0x04 82 #define MIP4_R1_EVENT_SIZE 0x06 83 #define MIP4_R1_EVENT_PACKET_INFO 0x10 84 #define MIP4_R1_EVENT_PACKET_DATA 0x11 85 86 #define MIP4_R0_CTRL 0x06 87 #define MIP4_R1_CTRL_READY_STATUS 0x00 88 #define MIP4_R1_CTRL_EVENT_READY 0x01 89 #define MIP4_R1_CTRL_MODE 0x10 90 #define MIP4_R1_CTRL_EVENT_TRIGGER_TYPE 0x11 91 #define MIP4_R1_CTRL_RECALIBRATE 0x12 92 #define MIP4_R1_CTRL_POWER_STATE 0x13 93 #define MIP4_R1_CTRL_GESTURE_TYPE 0x14 94 #define MIP4_R1_CTRL_DISABLE_ESD_ALERT 0x18 95 #define MIP4_R1_CTRL_CHARGER_MODE 0x19 96 #define MIP4_R1_CTRL_HIGH_SENS_MODE 0x1A 97 #define MIP4_R1_CTRL_WINDOW_MODE 0x1B 98 #define MIP4_R1_CTRL_PALM_REJECTION 0x1C 99 #define MIP4_R1_CTRL_EDGE_CORRECTION 0x1D 100 #define MIP4_R1_CTRL_ENTER_GLOVE_MODE 0x1E 101 #define MIP4_R1_CTRL_I2C_ON_LPM 0x1F 102 #define MIP4_R1_CTRL_GESTURE_DEBUG 0x20 103 #define MIP4_R1_CTRL_PALM_EVENT 0x22 104 #define MIP4_R1_CTRL_PROXIMITY_SENSING 0x23 105 106 /* Value */ 107 #define MIP4_BOOT_MODE_BOOT 0x01 108 #define MIP4_BOOT_MODE_APP 0x02 109 110 #define MIP4_BOOT_STATUS_BUSY 0x05 111 #define MIP4_BOOT_STATUS_ERROR 0x0E 112 #define MIP4_BOOT_STATUS_DONE 0xA0 113 114 #define MIP4_BOOT_CMD_MASS_ERASE 0x15 115 #define MIP4_BOOT_CMD_PROGRAM 0x54 116 #define MIP4_BOOT_CMD_ERASE 0x8F 117 #define MIP4_BOOT_CMD_WRITE 0xA5 118 #define MIP4_BOOT_CMD_READ 0xC2 119 120 #define MIP4_EVENT_INPUT_TYPE_KEY 0 121 #define MIP4_EVENT_INPUT_TYPE_SCREEN 1 122 #define MIP4_EVENT_INPUT_TYPE_PROXIMITY 2 123 124 #define I2C_RETRY_COUNT 3 /* 2~ */ 125 126 #define MIP4_BUF_SIZE 128 127 #define MIP4_MAX_FINGERS 10 128 #define MIP4_MAX_KEYS 4 129 130 #define MIP4_TOUCH_MAJOR_MIN 0 131 #define MIP4_TOUCH_MAJOR_MAX 255 132 #define MIP4_TOUCH_MINOR_MIN 0 133 #define MIP4_TOUCH_MINOR_MAX 255 134 #define MIP4_PRESSURE_MIN 0 135 #define MIP4_PRESSURE_MAX 255 136 137 #define MIP4_FW_NAME "melfas_mip4.fw" 138 #define MIP4_FW_UPDATE_DEBUG 0 /* 0 (default) or 1 */ 139 140 struct mip4_fw_version { 141 u16 boot; 142 u16 core; 143 u16 app; 144 u16 param; 145 }; 146 147 struct mip4_ts { 148 struct i2c_client *client; 149 struct input_dev *input; 150 struct gpio_desc *gpio_ce; 151 152 char phys[32]; 153 char product_name[16]; 154 u16 product_id; 155 char ic_name[4]; 156 char fw_name[32]; 157 158 unsigned int max_x; 159 unsigned int max_y; 160 u8 node_x; 161 u8 node_y; 162 u8 node_key; 163 unsigned int ppm_x; 164 unsigned int ppm_y; 165 166 struct mip4_fw_version fw_version; 167 168 unsigned int event_size; 169 unsigned int event_format; 170 171 unsigned int key_num; 172 unsigned short key_code[MIP4_MAX_KEYS]; 173 174 bool wake_irq_enabled; 175 176 u8 buf[MIP4_BUF_SIZE]; 177 }; 178 mip4_i2c_xfer(struct mip4_ts * ts,char * write_buf,unsigned int write_len,char * read_buf,unsigned int read_len)179 static int mip4_i2c_xfer(struct mip4_ts *ts, 180 char *write_buf, unsigned int write_len, 181 char *read_buf, unsigned int read_len) 182 { 183 struct i2c_msg msg[] = { 184 { 185 .addr = ts->client->addr, 186 .flags = 0, 187 .buf = write_buf, 188 .len = write_len, 189 }, { 190 .addr = ts->client->addr, 191 .flags = I2C_M_RD, 192 .buf = read_buf, 193 .len = read_len, 194 }, 195 }; 196 int retry = I2C_RETRY_COUNT; 197 int res; 198 int error; 199 200 do { 201 res = i2c_transfer(ts->client->adapter, msg, ARRAY_SIZE(msg)); 202 if (res == ARRAY_SIZE(msg)) 203 return 0; 204 205 error = res < 0 ? res : -EIO; 206 dev_err(&ts->client->dev, 207 "%s - i2c_transfer failed: %d (%d)\n", 208 __func__, error, res); 209 } while (--retry); 210 211 return error; 212 } 213 mip4_parse_fw_version(const u8 * buf,struct mip4_fw_version * v)214 static void mip4_parse_fw_version(const u8 *buf, struct mip4_fw_version *v) 215 { 216 v->boot = get_unaligned_le16(buf + 0); 217 v->core = get_unaligned_le16(buf + 2); 218 v->app = get_unaligned_le16(buf + 4); 219 v->param = get_unaligned_le16(buf + 6); 220 } 221 222 /* 223 * Read chip firmware version 224 */ mip4_get_fw_version(struct mip4_ts * ts)225 static int mip4_get_fw_version(struct mip4_ts *ts) 226 { 227 u8 cmd[] = { MIP4_R0_INFO, MIP4_R1_INFO_VERSION_BOOT }; 228 u8 buf[sizeof(ts->fw_version)]; 229 int error; 230 231 error = mip4_i2c_xfer(ts, cmd, sizeof(cmd), buf, sizeof(buf)); 232 if (error) { 233 memset(&ts->fw_version, 0xff, sizeof(ts->fw_version)); 234 return error; 235 } 236 237 mip4_parse_fw_version(buf, &ts->fw_version); 238 239 return 0; 240 } 241 242 /* 243 * Fetch device characteristics 244 */ mip4_query_device(struct mip4_ts * ts)245 static int mip4_query_device(struct mip4_ts *ts) 246 { 247 union i2c_smbus_data dummy; 248 int error; 249 u8 cmd[2]; 250 u8 buf[14]; 251 252 /* 253 * Make sure there is something at this address as we do not 254 * consider subsequent failures as fatal. 255 */ 256 if (i2c_smbus_xfer(ts->client->adapter, ts->client->addr, 257 0, I2C_SMBUS_READ, 0, I2C_SMBUS_BYTE, &dummy) < 0) { 258 dev_err(&ts->client->dev, "nothing at this address\n"); 259 return -ENXIO; 260 } 261 262 /* Product name */ 263 cmd[0] = MIP4_R0_INFO; 264 cmd[1] = MIP4_R1_INFO_PRODUCT_NAME; 265 error = mip4_i2c_xfer(ts, cmd, sizeof(cmd), 266 ts->product_name, sizeof(ts->product_name)); 267 if (error) 268 dev_warn(&ts->client->dev, 269 "Failed to retrieve product name: %d\n", error); 270 else 271 dev_dbg(&ts->client->dev, "product name: %.*s\n", 272 (int)sizeof(ts->product_name), ts->product_name); 273 274 /* Product ID */ 275 cmd[0] = MIP4_R0_INFO; 276 cmd[1] = MIP4_R1_INFO_PID; 277 error = mip4_i2c_xfer(ts, cmd, sizeof(cmd), buf, 2); 278 if (error) { 279 dev_warn(&ts->client->dev, 280 "Failed to retrieve product id: %d\n", error); 281 } else { 282 ts->product_id = get_unaligned_le16(&buf[0]); 283 dev_dbg(&ts->client->dev, "product id: %04X\n", ts->product_id); 284 } 285 286 /* Firmware name */ 287 snprintf(ts->fw_name, sizeof(ts->fw_name), 288 "melfas_mip4_%04X.fw", ts->product_id); 289 dev_dbg(&ts->client->dev, "firmware name: %s\n", ts->fw_name); 290 291 /* IC name */ 292 cmd[0] = MIP4_R0_INFO; 293 cmd[1] = MIP4_R1_INFO_IC_NAME; 294 error = mip4_i2c_xfer(ts, cmd, sizeof(cmd), 295 ts->ic_name, sizeof(ts->ic_name)); 296 if (error) 297 dev_warn(&ts->client->dev, 298 "Failed to retrieve IC name: %d\n", error); 299 else 300 dev_dbg(&ts->client->dev, "IC name: %.*s\n", 301 (int)sizeof(ts->ic_name), ts->ic_name); 302 303 /* Firmware version */ 304 error = mip4_get_fw_version(ts); 305 if (error) 306 dev_warn(&ts->client->dev, 307 "Failed to retrieve FW version: %d\n", error); 308 else 309 dev_dbg(&ts->client->dev, "F/W Version: %04X %04X %04X %04X\n", 310 ts->fw_version.boot, ts->fw_version.core, 311 ts->fw_version.app, ts->fw_version.param); 312 313 /* Resolution */ 314 cmd[0] = MIP4_R0_INFO; 315 cmd[1] = MIP4_R1_INFO_RESOLUTION_X; 316 error = mip4_i2c_xfer(ts, cmd, sizeof(cmd), buf, 14); 317 if (error) { 318 dev_warn(&ts->client->dev, 319 "Failed to retrieve touchscreen parameters: %d\n", 320 error); 321 } else { 322 ts->max_x = get_unaligned_le16(&buf[0]); 323 ts->max_y = get_unaligned_le16(&buf[2]); 324 dev_dbg(&ts->client->dev, "max_x: %d, max_y: %d\n", 325 ts->max_x, ts->max_y); 326 327 ts->node_x = buf[4]; 328 ts->node_y = buf[5]; 329 ts->node_key = buf[6]; 330 dev_dbg(&ts->client->dev, 331 "node_x: %d, node_y: %d, node_key: %d\n", 332 ts->node_x, ts->node_y, ts->node_key); 333 334 ts->ppm_x = buf[12]; 335 ts->ppm_y = buf[13]; 336 dev_dbg(&ts->client->dev, "ppm_x: %d, ppm_y: %d\n", 337 ts->ppm_x, ts->ppm_y); 338 339 /* Key ts */ 340 if (ts->node_key > 0) 341 ts->key_num = ts->node_key; 342 } 343 344 /* Protocol */ 345 cmd[0] = MIP4_R0_EVENT; 346 cmd[1] = MIP4_R1_EVENT_SUPPORTED_FUNC; 347 error = mip4_i2c_xfer(ts, cmd, sizeof(cmd), buf, 7); 348 if (error) { 349 dev_warn(&ts->client->dev, 350 "Failed to retrieve device type: %d\n", error); 351 ts->event_format = 0xff; 352 } else { 353 ts->event_format = get_unaligned_le16(&buf[4]); 354 ts->event_size = buf[6]; 355 dev_dbg(&ts->client->dev, "event_format: %d, event_size: %d\n", 356 ts->event_format, ts->event_size); 357 358 if (ts->event_format == 2 || ts->event_format > 3) 359 dev_warn(&ts->client->dev, 360 "Unknown event format %d\n", ts->event_format); 361 } 362 363 return 0; 364 } 365 mip4_power_on(struct mip4_ts * ts)366 static int mip4_power_on(struct mip4_ts *ts) 367 { 368 if (ts->gpio_ce) { 369 gpiod_set_value_cansleep(ts->gpio_ce, 1); 370 371 /* Booting delay : 200~300ms */ 372 usleep_range(200 * 1000, 300 * 1000); 373 } 374 375 return 0; 376 } 377 mip4_power_off(struct mip4_ts * ts)378 static void mip4_power_off(struct mip4_ts *ts) 379 { 380 if (ts->gpio_ce) 381 gpiod_set_value_cansleep(ts->gpio_ce, 0); 382 } 383 384 /* 385 * Clear touch input event status 386 */ mip4_clear_input(struct mip4_ts * ts)387 static void mip4_clear_input(struct mip4_ts *ts) 388 { 389 int i; 390 391 /* Screen */ 392 for (i = 0; i < MIP4_MAX_FINGERS; i++) { 393 input_mt_slot(ts->input, i); 394 input_mt_report_slot_inactive(ts->input); 395 } 396 397 /* Keys */ 398 for (i = 0; i < ts->key_num; i++) 399 input_report_key(ts->input, ts->key_code[i], 0); 400 401 input_sync(ts->input); 402 } 403 mip4_enable(struct mip4_ts * ts)404 static int mip4_enable(struct mip4_ts *ts) 405 { 406 int error; 407 408 error = mip4_power_on(ts); 409 if (error) 410 return error; 411 412 enable_irq(ts->client->irq); 413 414 return 0; 415 } 416 mip4_disable(struct mip4_ts * ts)417 static void mip4_disable(struct mip4_ts *ts) 418 { 419 disable_irq(ts->client->irq); 420 421 mip4_power_off(ts); 422 423 mip4_clear_input(ts); 424 } 425 426 /***************************************************************** 427 * Input handling 428 *****************************************************************/ 429 mip4_report_keys(struct mip4_ts * ts,u8 * packet)430 static void mip4_report_keys(struct mip4_ts *ts, u8 *packet) 431 { 432 u8 key; 433 bool down; 434 435 switch (ts->event_format) { 436 case 0: 437 case 1: 438 key = packet[0] & 0x0F; 439 down = packet[0] & 0x80; 440 break; 441 442 case 3: 443 default: 444 key = packet[0] & 0x0F; 445 down = packet[1] & 0x01; 446 break; 447 } 448 449 /* Report key event */ 450 if (key >= 1 && key <= ts->key_num) { 451 unsigned short keycode = ts->key_code[key - 1]; 452 453 dev_dbg(&ts->client->dev, 454 "Key - ID: %d, keycode: %d, state: %d\n", 455 key, keycode, down); 456 457 input_event(ts->input, EV_MSC, MSC_SCAN, keycode); 458 input_report_key(ts->input, keycode, down); 459 460 } else { 461 dev_err(&ts->client->dev, "Unknown key: %d\n", key); 462 } 463 } 464 mip4_report_touch(struct mip4_ts * ts,u8 * packet)465 static void mip4_report_touch(struct mip4_ts *ts, u8 *packet) 466 { 467 int id; 468 bool __always_unused hover; 469 bool palm; 470 bool state; 471 u16 x, y; 472 u8 __always_unused pressure_stage = 0; 473 u8 pressure; 474 u8 __always_unused size; 475 u8 touch_major; 476 u8 touch_minor; 477 478 switch (ts->event_format) { 479 case 0: 480 case 1: 481 /* Touch only */ 482 state = packet[0] & BIT(7); 483 hover = packet[0] & BIT(5); 484 palm = packet[0] & BIT(4); 485 id = (packet[0] & 0x0F) - 1; 486 x = ((packet[1] & 0x0F) << 8) | packet[2]; 487 y = (((packet[1] >> 4) & 0x0F) << 8) | 488 packet[3]; 489 pressure = packet[4]; 490 size = packet[5]; 491 if (ts->event_format == 0) { 492 touch_major = packet[5]; 493 touch_minor = packet[5]; 494 } else { 495 touch_major = packet[6]; 496 touch_minor = packet[7]; 497 } 498 break; 499 500 case 3: 501 default: 502 /* Touch + Force(Pressure) */ 503 id = (packet[0] & 0x0F) - 1; 504 hover = packet[1] & BIT(2); 505 palm = packet[1] & BIT(1); 506 state = packet[1] & BIT(0); 507 x = ((packet[2] & 0x0F) << 8) | packet[3]; 508 y = (((packet[2] >> 4) & 0x0F) << 8) | 509 packet[4]; 510 size = packet[6]; 511 pressure_stage = (packet[7] & 0xF0) >> 4; 512 pressure = ((packet[7] & 0x0F) << 8) | 513 packet[8]; 514 touch_major = packet[9]; 515 touch_minor = packet[10]; 516 break; 517 } 518 519 dev_dbg(&ts->client->dev, 520 "Screen - Slot: %d State: %d X: %04d Y: %04d Z: %d\n", 521 id, state, x, y, pressure); 522 523 if (unlikely(id < 0 || id >= MIP4_MAX_FINGERS)) { 524 dev_err(&ts->client->dev, "Screen - invalid slot ID: %d\n", id); 525 goto out; 526 } 527 528 input_mt_slot(ts->input, id); 529 if (input_mt_report_slot_state(ts->input, 530 palm ? MT_TOOL_PALM : MT_TOOL_FINGER, 531 state)) { 532 input_report_abs(ts->input, ABS_MT_POSITION_X, x); 533 input_report_abs(ts->input, ABS_MT_POSITION_Y, y); 534 input_report_abs(ts->input, ABS_MT_PRESSURE, pressure); 535 input_report_abs(ts->input, ABS_MT_TOUCH_MAJOR, touch_major); 536 input_report_abs(ts->input, ABS_MT_TOUCH_MINOR, touch_minor); 537 } 538 539 out: 540 input_mt_sync_frame(ts->input); 541 } 542 mip4_handle_packet(struct mip4_ts * ts,u8 * packet)543 static int mip4_handle_packet(struct mip4_ts *ts, u8 *packet) 544 { 545 u8 type; 546 547 switch (ts->event_format) { 548 case 0: 549 case 1: 550 type = (packet[0] & 0x40) >> 6; 551 break; 552 553 case 3: 554 type = (packet[0] & 0xF0) >> 4; 555 break; 556 557 default: 558 /* Should not happen unless we have corrupted firmware */ 559 return -EINVAL; 560 } 561 562 dev_dbg(&ts->client->dev, "Type: %d\n", type); 563 564 /* Report input event */ 565 switch (type) { 566 case MIP4_EVENT_INPUT_TYPE_KEY: 567 mip4_report_keys(ts, packet); 568 break; 569 570 case MIP4_EVENT_INPUT_TYPE_SCREEN: 571 mip4_report_touch(ts, packet); 572 break; 573 574 default: 575 dev_err(&ts->client->dev, "Unknown event type: %d\n", type); 576 break; 577 } 578 579 return 0; 580 } 581 mip4_interrupt(int irq,void * dev_id)582 static irqreturn_t mip4_interrupt(int irq, void *dev_id) 583 { 584 struct mip4_ts *ts = dev_id; 585 struct i2c_client *client = ts->client; 586 unsigned int i; 587 int error; 588 u8 cmd[2]; 589 u8 size; 590 bool alert; 591 592 /* Read packet info */ 593 cmd[0] = MIP4_R0_EVENT; 594 cmd[1] = MIP4_R1_EVENT_PACKET_INFO; 595 error = mip4_i2c_xfer(ts, cmd, sizeof(cmd), ts->buf, 1); 596 if (error) { 597 dev_err(&client->dev, 598 "Failed to read packet info: %d\n", error); 599 goto out; 600 } 601 602 size = ts->buf[0] & 0x7F; 603 alert = ts->buf[0] & BIT(7); 604 dev_dbg(&client->dev, "packet size: %d, alert: %d\n", size, alert); 605 606 /* Check size */ 607 if (!size) { 608 dev_err(&client->dev, "Empty packet\n"); 609 goto out; 610 } 611 612 /* Read packet data */ 613 cmd[0] = MIP4_R0_EVENT; 614 cmd[1] = MIP4_R1_EVENT_PACKET_DATA; 615 error = mip4_i2c_xfer(ts, cmd, sizeof(cmd), ts->buf, size); 616 if (error) { 617 dev_err(&client->dev, 618 "Failed to read packet data: %d\n", error); 619 goto out; 620 } 621 622 if (alert) { 623 dev_dbg(&client->dev, "Alert: %d\n", ts->buf[0]); 624 } else { 625 for (i = 0; i < size; i += ts->event_size) { 626 error = mip4_handle_packet(ts, &ts->buf[i]); 627 if (error) 628 break; 629 } 630 631 input_sync(ts->input); 632 } 633 634 out: 635 return IRQ_HANDLED; 636 } 637 mip4_input_open(struct input_dev * dev)638 static int mip4_input_open(struct input_dev *dev) 639 { 640 struct mip4_ts *ts = input_get_drvdata(dev); 641 642 return mip4_enable(ts); 643 } 644 mip4_input_close(struct input_dev * dev)645 static void mip4_input_close(struct input_dev *dev) 646 { 647 struct mip4_ts *ts = input_get_drvdata(dev); 648 649 mip4_disable(ts); 650 } 651 652 /***************************************************************** 653 * Firmware update 654 *****************************************************************/ 655 656 /* Firmware Info */ 657 #define MIP4_BL_PAGE_SIZE 512 /* 512 */ 658 #define MIP4_BL_PACKET_SIZE 512 /* 512, 256, 128, 64, ... */ 659 660 /* 661 * Firmware binary tail info 662 */ 663 664 struct mip4_bin_tail { 665 u8 tail_mark[4]; 666 u8 chip_name[4]; 667 668 __le32 bin_start_addr; 669 __le32 bin_length; 670 671 __le16 ver_boot; 672 __le16 ver_core; 673 __le16 ver_app; 674 __le16 ver_param; 675 676 u8 boot_start; 677 u8 boot_end; 678 u8 core_start; 679 u8 core_end; 680 u8 app_start; 681 u8 app_end; 682 u8 param_start; 683 u8 param_end; 684 685 u8 checksum_type; 686 u8 hw_category; 687 688 __le16 param_id; 689 __le32 param_length; 690 __le32 build_date; 691 __le32 build_time; 692 693 __le32 reserved1; 694 __le32 reserved2; 695 __le16 reserved3; 696 __le16 tail_size; 697 __le32 crc; 698 } __packed; 699 700 #define MIP4_BIN_TAIL_MARK "MBT\001" 701 #define MIP4_BIN_TAIL_SIZE (sizeof(struct mip4_bin_tail)) 702 703 /* 704 * Bootloader - Read status 705 */ mip4_bl_read_status(struct mip4_ts * ts)706 static int mip4_bl_read_status(struct mip4_ts *ts) 707 { 708 u8 cmd[] = { MIP4_R0_BOOT, MIP4_R1_BOOT_STATUS }; 709 u8 result; 710 struct i2c_msg msg[] = { 711 { 712 .addr = ts->client->addr, 713 .flags = 0, 714 .buf = cmd, 715 .len = sizeof(cmd), 716 }, { 717 .addr = ts->client->addr, 718 .flags = I2C_M_RD, 719 .buf = &result, 720 .len = sizeof(result), 721 }, 722 }; 723 int ret; 724 int error; 725 int retry = 1000; 726 727 do { 728 ret = i2c_transfer(ts->client->adapter, msg, ARRAY_SIZE(msg)); 729 if (ret != ARRAY_SIZE(msg)) { 730 error = ret < 0 ? ret : -EIO; 731 dev_err(&ts->client->dev, 732 "Failed to read bootloader status: %d\n", 733 error); 734 return error; 735 } 736 737 switch (result) { 738 case MIP4_BOOT_STATUS_DONE: 739 dev_dbg(&ts->client->dev, "%s - done\n", __func__); 740 return 0; 741 742 case MIP4_BOOT_STATUS_ERROR: 743 dev_err(&ts->client->dev, "Bootloader failure\n"); 744 return -EIO; 745 746 case MIP4_BOOT_STATUS_BUSY: 747 dev_dbg(&ts->client->dev, "%s - Busy\n", __func__); 748 error = -EBUSY; 749 break; 750 751 default: 752 dev_err(&ts->client->dev, 753 "Unexpected bootloader status: %#02x\n", 754 result); 755 error = -EINVAL; 756 break; 757 } 758 759 usleep_range(1000, 2000); 760 } while (--retry); 761 762 return error; 763 } 764 765 /* 766 * Bootloader - Change mode 767 */ mip4_bl_change_mode(struct mip4_ts * ts,u8 mode)768 static int mip4_bl_change_mode(struct mip4_ts *ts, u8 mode) 769 { 770 u8 mode_chg_cmd[] = { MIP4_R0_BOOT, MIP4_R1_BOOT_MODE, mode }; 771 u8 mode_read_cmd[] = { MIP4_R0_BOOT, MIP4_R1_BOOT_MODE }; 772 u8 result; 773 struct i2c_msg msg[] = { 774 { 775 .addr = ts->client->addr, 776 .flags = 0, 777 .buf = mode_read_cmd, 778 .len = sizeof(mode_read_cmd), 779 }, { 780 .addr = ts->client->addr, 781 .flags = I2C_M_RD, 782 .buf = &result, 783 .len = sizeof(result), 784 }, 785 }; 786 int retry = 10; 787 int ret; 788 int error; 789 790 do { 791 /* Send mode change command */ 792 ret = i2c_master_send(ts->client, 793 mode_chg_cmd, sizeof(mode_chg_cmd)); 794 if (ret != sizeof(mode_chg_cmd)) { 795 error = ret < 0 ? ret : -EIO; 796 dev_err(&ts->client->dev, 797 "Failed to send %d mode change: %d (%d)\n", 798 mode, error, ret); 799 return error; 800 } 801 802 dev_dbg(&ts->client->dev, 803 "Sent mode change request (mode: %d)\n", mode); 804 805 /* Wait */ 806 msleep(1000); 807 808 /* Verify target mode */ 809 ret = i2c_transfer(ts->client->adapter, msg, ARRAY_SIZE(msg)); 810 if (ret != ARRAY_SIZE(msg)) { 811 error = ret < 0 ? ret : -EIO; 812 dev_err(&ts->client->dev, 813 "Failed to read device mode: %d\n", error); 814 return error; 815 } 816 817 dev_dbg(&ts->client->dev, 818 "Current device mode: %d, want: %d\n", result, mode); 819 820 if (result == mode) 821 return 0; 822 823 } while (--retry); 824 825 return -EIO; 826 } 827 828 /* 829 * Bootloader - Start bootloader mode 830 */ mip4_bl_enter(struct mip4_ts * ts)831 static int mip4_bl_enter(struct mip4_ts *ts) 832 { 833 return mip4_bl_change_mode(ts, MIP4_BOOT_MODE_BOOT); 834 } 835 836 /* 837 * Bootloader - Exit bootloader mode 838 */ mip4_bl_exit(struct mip4_ts * ts)839 static int mip4_bl_exit(struct mip4_ts *ts) 840 { 841 return mip4_bl_change_mode(ts, MIP4_BOOT_MODE_APP); 842 } 843 mip4_bl_get_address(struct mip4_ts * ts,u16 * buf_addr)844 static int mip4_bl_get_address(struct mip4_ts *ts, u16 *buf_addr) 845 { 846 u8 cmd[] = { MIP4_R0_BOOT, MIP4_R1_BOOT_BUF_ADDR }; 847 u8 result[sizeof(u16)]; 848 struct i2c_msg msg[] = { 849 { 850 .addr = ts->client->addr, 851 .flags = 0, 852 .buf = cmd, 853 .len = sizeof(cmd), 854 }, { 855 .addr = ts->client->addr, 856 .flags = I2C_M_RD, 857 .buf = result, 858 .len = sizeof(result), 859 }, 860 }; 861 int ret; 862 int error; 863 864 ret = i2c_transfer(ts->client->adapter, msg, ARRAY_SIZE(msg)); 865 if (ret != ARRAY_SIZE(msg)) { 866 error = ret < 0 ? ret : -EIO; 867 dev_err(&ts->client->dev, 868 "Failed to retrieve bootloader buffer address: %d\n", 869 error); 870 return error; 871 } 872 873 *buf_addr = get_unaligned_le16(result); 874 dev_dbg(&ts->client->dev, 875 "Bootloader buffer address %#04x\n", *buf_addr); 876 877 return 0; 878 } 879 mip4_bl_program_page(struct mip4_ts * ts,int offset,const u8 * data,int length,u16 buf_addr)880 static int mip4_bl_program_page(struct mip4_ts *ts, int offset, 881 const u8 *data, int length, u16 buf_addr) 882 { 883 u8 cmd[6]; 884 u8 *data_buf; 885 u16 buf_offset; 886 int ret; 887 int error; 888 889 dev_dbg(&ts->client->dev, "Writing page @%#06x (%d)\n", 890 offset, length); 891 892 if (length > MIP4_BL_PAGE_SIZE || length % MIP4_BL_PACKET_SIZE) { 893 dev_err(&ts->client->dev, 894 "Invalid page length: %d\n", length); 895 return -EINVAL; 896 } 897 898 data_buf = kmalloc(2 + MIP4_BL_PACKET_SIZE, GFP_KERNEL); 899 if (!data_buf) 900 return -ENOMEM; 901 902 /* Addr */ 903 cmd[0] = MIP4_R0_BOOT; 904 cmd[1] = MIP4_R1_BOOT_TARGET_ADDR; 905 put_unaligned_le32(offset, &cmd[2]); 906 ret = i2c_master_send(ts->client, cmd, 6); 907 if (ret != 6) { 908 error = ret < 0 ? ret : -EIO; 909 dev_err(&ts->client->dev, 910 "Failed to send write page address: %d\n", error); 911 goto out; 912 } 913 914 /* Size */ 915 cmd[0] = MIP4_R0_BOOT; 916 cmd[1] = MIP4_R1_BOOT_SIZE; 917 put_unaligned_le32(length, &cmd[2]); 918 ret = i2c_master_send(ts->client, cmd, 6); 919 if (ret != 6) { 920 error = ret < 0 ? ret : -EIO; 921 dev_err(&ts->client->dev, 922 "Failed to send write page size: %d\n", error); 923 goto out; 924 } 925 926 /* Data */ 927 for (buf_offset = 0; 928 buf_offset < length; 929 buf_offset += MIP4_BL_PACKET_SIZE) { 930 dev_dbg(&ts->client->dev, 931 "writing chunk at %#04x (size %d)\n", 932 buf_offset, MIP4_BL_PACKET_SIZE); 933 put_unaligned_be16(buf_addr + buf_offset, data_buf); 934 memcpy(&data_buf[2], &data[buf_offset], MIP4_BL_PACKET_SIZE); 935 ret = i2c_master_send(ts->client, 936 data_buf, 2 + MIP4_BL_PACKET_SIZE); 937 if (ret != 2 + MIP4_BL_PACKET_SIZE) { 938 error = ret < 0 ? ret : -EIO; 939 dev_err(&ts->client->dev, 940 "Failed to read chunk at %#04x (size %d): %d\n", 941 buf_offset, MIP4_BL_PACKET_SIZE, error); 942 goto out; 943 } 944 } 945 946 /* Command */ 947 cmd[0] = MIP4_R0_BOOT; 948 cmd[1] = MIP4_R1_BOOT_CMD; 949 cmd[2] = MIP4_BOOT_CMD_PROGRAM; 950 ret = i2c_master_send(ts->client, cmd, 3); 951 if (ret != 3) { 952 error = ret < 0 ? ret : -EIO; 953 dev_err(&ts->client->dev, 954 "Failed to send 'write' command: %d\n", error); 955 goto out; 956 } 957 958 /* Status */ 959 error = mip4_bl_read_status(ts); 960 961 out: 962 kfree(data_buf); 963 return error ? error : 0; 964 } 965 mip4_bl_verify_page(struct mip4_ts * ts,int offset,const u8 * data,int length,int buf_addr)966 static int mip4_bl_verify_page(struct mip4_ts *ts, int offset, 967 const u8 *data, int length, int buf_addr) 968 { 969 u8 cmd[8]; 970 u8 *read_buf; 971 int buf_offset; 972 struct i2c_msg msg[] = { 973 { 974 .addr = ts->client->addr, 975 .flags = 0, 976 .buf = cmd, 977 .len = 2, 978 }, { 979 .addr = ts->client->addr, 980 .flags = I2C_M_RD, 981 .len = MIP4_BL_PACKET_SIZE, 982 }, 983 }; 984 int ret; 985 int error; 986 987 dev_dbg(&ts->client->dev, "Validating page @%#06x (%d)\n", 988 offset, length); 989 990 /* Addr */ 991 cmd[0] = MIP4_R0_BOOT; 992 cmd[1] = MIP4_R1_BOOT_TARGET_ADDR; 993 put_unaligned_le32(offset, &cmd[2]); 994 ret = i2c_master_send(ts->client, cmd, 6); 995 if (ret != 6) { 996 error = ret < 0 ? ret : -EIO; 997 dev_err(&ts->client->dev, 998 "Failed to send read page address: %d\n", error); 999 return error; 1000 } 1001 1002 /* Size */ 1003 cmd[0] = MIP4_R0_BOOT; 1004 cmd[1] = MIP4_R1_BOOT_SIZE; 1005 put_unaligned_le32(length, &cmd[2]); 1006 ret = i2c_master_send(ts->client, cmd, 6); 1007 if (ret != 6) { 1008 error = ret < 0 ? ret : -EIO; 1009 dev_err(&ts->client->dev, 1010 "Failed to send read page size: %d\n", error); 1011 return error; 1012 } 1013 1014 /* Command */ 1015 cmd[0] = MIP4_R0_BOOT; 1016 cmd[1] = MIP4_R1_BOOT_CMD; 1017 cmd[2] = MIP4_BOOT_CMD_READ; 1018 ret = i2c_master_send(ts->client, cmd, 3); 1019 if (ret != 3) { 1020 error = ret < 0 ? ret : -EIO; 1021 dev_err(&ts->client->dev, 1022 "Failed to send 'read' command: %d\n", error); 1023 return error; 1024 } 1025 1026 /* Status */ 1027 error = mip4_bl_read_status(ts); 1028 if (error) 1029 return error; 1030 1031 /* Read */ 1032 msg[1].buf = read_buf = kmalloc(MIP4_BL_PACKET_SIZE, GFP_KERNEL); 1033 if (!read_buf) 1034 return -ENOMEM; 1035 1036 for (buf_offset = 0; 1037 buf_offset < length; 1038 buf_offset += MIP4_BL_PACKET_SIZE) { 1039 dev_dbg(&ts->client->dev, 1040 "reading chunk at %#04x (size %d)\n", 1041 buf_offset, MIP4_BL_PACKET_SIZE); 1042 put_unaligned_be16(buf_addr + buf_offset, cmd); 1043 ret = i2c_transfer(ts->client->adapter, msg, ARRAY_SIZE(msg)); 1044 if (ret != ARRAY_SIZE(msg)) { 1045 error = ret < 0 ? ret : -EIO; 1046 dev_err(&ts->client->dev, 1047 "Failed to read chunk at %#04x (size %d): %d\n", 1048 buf_offset, MIP4_BL_PACKET_SIZE, error); 1049 break; 1050 } 1051 1052 if (memcmp(&data[buf_offset], read_buf, MIP4_BL_PACKET_SIZE)) { 1053 dev_err(&ts->client->dev, 1054 "Failed to validate chunk at %#04x (size %d)\n", 1055 buf_offset, MIP4_BL_PACKET_SIZE); 1056 #if MIP4_FW_UPDATE_DEBUG 1057 print_hex_dump(KERN_DEBUG, 1058 MIP4_DEVICE_NAME " F/W File: ", 1059 DUMP_PREFIX_OFFSET, 16, 1, 1060 data + offset, MIP4_BL_PACKET_SIZE, 1061 false); 1062 print_hex_dump(KERN_DEBUG, 1063 MIP4_DEVICE_NAME " F/W Chip: ", 1064 DUMP_PREFIX_OFFSET, 16, 1, 1065 read_buf, MIP4_BL_PAGE_SIZE, false); 1066 #endif 1067 error = -EINVAL; 1068 break; 1069 } 1070 } 1071 1072 kfree(read_buf); 1073 return error ? error : 0; 1074 } 1075 1076 /* 1077 * Flash chip firmware 1078 */ mip4_flash_fw(struct mip4_ts * ts,const u8 * fw_data,u32 fw_size,u32 fw_offset)1079 static int mip4_flash_fw(struct mip4_ts *ts, 1080 const u8 *fw_data, u32 fw_size, u32 fw_offset) 1081 { 1082 struct i2c_client *client = ts->client; 1083 int offset; 1084 u16 buf_addr; 1085 int error, error2; 1086 1087 /* Enter bootloader mode */ 1088 dev_dbg(&client->dev, "Entering bootloader mode\n"); 1089 1090 error = mip4_bl_enter(ts); 1091 if (error) { 1092 dev_err(&client->dev, 1093 "Failed to enter bootloader mode: %d\n", 1094 error); 1095 return error; 1096 } 1097 1098 /* Read info */ 1099 error = mip4_bl_get_address(ts, &buf_addr); 1100 if (error) 1101 goto exit_bl; 1102 1103 /* Program & Verify */ 1104 dev_dbg(&client->dev, 1105 "Program & Verify, page size: %d, packet size: %d\n", 1106 MIP4_BL_PAGE_SIZE, MIP4_BL_PACKET_SIZE); 1107 1108 for (offset = fw_offset; 1109 offset < fw_offset + fw_size; 1110 offset += MIP4_BL_PAGE_SIZE) { 1111 /* Program */ 1112 error = mip4_bl_program_page(ts, offset, fw_data + offset, 1113 MIP4_BL_PAGE_SIZE, buf_addr); 1114 if (error) 1115 break; 1116 1117 /* Verify */ 1118 error = mip4_bl_verify_page(ts, offset, fw_data + offset, 1119 MIP4_BL_PAGE_SIZE, buf_addr); 1120 if (error) 1121 break; 1122 } 1123 1124 exit_bl: 1125 /* Exit bootloader mode */ 1126 dev_dbg(&client->dev, "Exiting bootloader mode\n"); 1127 1128 error2 = mip4_bl_exit(ts); 1129 if (error2) { 1130 dev_err(&client->dev, 1131 "Failed to exit bootloader mode: %d\n", error2); 1132 if (!error) 1133 error = error2; 1134 } 1135 1136 /* Reset chip */ 1137 mip4_power_off(ts); 1138 mip4_power_on(ts); 1139 1140 mip4_query_device(ts); 1141 1142 /* Refresh device parameters */ 1143 input_set_abs_params(ts->input, ABS_MT_POSITION_X, 0, ts->max_x, 0, 0); 1144 input_set_abs_params(ts->input, ABS_MT_POSITION_Y, 0, ts->max_y, 0, 0); 1145 input_set_abs_params(ts->input, ABS_X, 0, ts->max_x, 0, 0); 1146 input_set_abs_params(ts->input, ABS_Y, 0, ts->max_y, 0, 0); 1147 input_abs_set_res(ts->input, ABS_MT_POSITION_X, ts->ppm_x); 1148 input_abs_set_res(ts->input, ABS_MT_POSITION_Y, ts->ppm_y); 1149 input_abs_set_res(ts->input, ABS_X, ts->ppm_x); 1150 input_abs_set_res(ts->input, ABS_Y, ts->ppm_y); 1151 1152 return error ? error : 0; 1153 } 1154 mip4_parse_firmware(struct mip4_ts * ts,const struct firmware * fw,u32 * fw_offset_start,u32 * fw_size,const struct mip4_bin_tail ** pfw_info)1155 static int mip4_parse_firmware(struct mip4_ts *ts, const struct firmware *fw, 1156 u32 *fw_offset_start, u32 *fw_size, 1157 const struct mip4_bin_tail **pfw_info) 1158 { 1159 const struct mip4_bin_tail *fw_info; 1160 struct mip4_fw_version fw_version; 1161 u16 tail_size; 1162 1163 if (fw->size < MIP4_BIN_TAIL_SIZE) { 1164 dev_err(&ts->client->dev, 1165 "Invalid firmware, size mismatch (tail %zd vs %zd)\n", 1166 MIP4_BIN_TAIL_SIZE, fw->size); 1167 return -EINVAL; 1168 } 1169 1170 fw_info = (const void *)&fw->data[fw->size - MIP4_BIN_TAIL_SIZE]; 1171 1172 #if MIP4_FW_UPDATE_DEBUG 1173 print_hex_dump(KERN_ERR, MIP4_DEVICE_NAME " Bin Info: ", 1174 DUMP_PREFIX_OFFSET, 16, 1, *fw_info, tail_size, false); 1175 #endif 1176 1177 tail_size = get_unaligned_le16(&fw_info->tail_size); 1178 if (tail_size != MIP4_BIN_TAIL_SIZE) { 1179 dev_err(&ts->client->dev, 1180 "wrong tail size: %d (expected %zd)\n", 1181 tail_size, MIP4_BIN_TAIL_SIZE); 1182 return -EINVAL; 1183 } 1184 1185 /* Check bin format */ 1186 if (memcmp(fw_info->tail_mark, MIP4_BIN_TAIL_MARK, 1187 sizeof(fw_info->tail_mark))) { 1188 dev_err(&ts->client->dev, 1189 "unable to locate tail marker (%*ph vs %*ph)\n", 1190 (int)sizeof(fw_info->tail_mark), fw_info->tail_mark, 1191 (int)sizeof(fw_info->tail_mark), MIP4_BIN_TAIL_MARK); 1192 return -EINVAL; 1193 } 1194 1195 *fw_offset_start = get_unaligned_le32(&fw_info->bin_start_addr); 1196 *fw_size = get_unaligned_le32(&fw_info->bin_length); 1197 1198 dev_dbg(&ts->client->dev, 1199 "F/W Data offset: %#08x, size: %d\n", 1200 *fw_offset_start, *fw_size); 1201 1202 if (*fw_size % MIP4_BL_PAGE_SIZE) { 1203 dev_err(&ts->client->dev, 1204 "encoded fw length %d is not multiple of pages (%d)\n", 1205 *fw_size, MIP4_BL_PAGE_SIZE); 1206 return -EINVAL; 1207 } 1208 1209 if (fw->size != *fw_offset_start + *fw_size) { 1210 dev_err(&ts->client->dev, 1211 "Wrong firmware size, expected %d bytes, got %zd\n", 1212 *fw_offset_start + *fw_size, fw->size); 1213 return -EINVAL; 1214 } 1215 1216 mip4_parse_fw_version((const u8 *)&fw_info->ver_boot, &fw_version); 1217 1218 dev_dbg(&ts->client->dev, 1219 "F/W file version %04X %04X %04X %04X\n", 1220 fw_version.boot, fw_version.core, 1221 fw_version.app, fw_version.param); 1222 1223 dev_dbg(&ts->client->dev, "F/W chip version: %04X %04X %04X %04X\n", 1224 ts->fw_version.boot, ts->fw_version.core, 1225 ts->fw_version.app, ts->fw_version.param); 1226 1227 /* Check F/W type */ 1228 if (fw_version.boot != 0xEEEE && fw_version.boot != 0xFFFF && 1229 fw_version.core == 0xEEEE && 1230 fw_version.app == 0xEEEE && 1231 fw_version.param == 0xEEEE) { 1232 dev_dbg(&ts->client->dev, "F/W type: Bootloader\n"); 1233 } else if (fw_version.boot == 0xEEEE && 1234 fw_version.core != 0xEEEE && fw_version.core != 0xFFFF && 1235 fw_version.app != 0xEEEE && fw_version.app != 0xFFFF && 1236 fw_version.param != 0xEEEE && fw_version.param != 0xFFFF) { 1237 dev_dbg(&ts->client->dev, "F/W type: Main\n"); 1238 } else { 1239 dev_err(&ts->client->dev, "Wrong firmware type\n"); 1240 return -EINVAL; 1241 } 1242 1243 return 0; 1244 } 1245 mip4_execute_fw_update(struct mip4_ts * ts,const struct firmware * fw)1246 static int mip4_execute_fw_update(struct mip4_ts *ts, const struct firmware *fw) 1247 { 1248 const struct mip4_bin_tail *fw_info; 1249 u32 fw_start_offset; 1250 u32 fw_size; 1251 int retires = 3; 1252 int error; 1253 1254 error = mip4_parse_firmware(ts, fw, 1255 &fw_start_offset, &fw_size, &fw_info); 1256 if (error) 1257 return error; 1258 1259 if (input_device_enabled(ts->input)) { 1260 disable_irq(ts->client->irq); 1261 } else { 1262 error = mip4_power_on(ts); 1263 if (error) 1264 return error; 1265 } 1266 1267 /* Update firmware */ 1268 do { 1269 error = mip4_flash_fw(ts, fw->data, fw_size, fw_start_offset); 1270 if (!error) 1271 break; 1272 } while (--retires); 1273 1274 if (error) 1275 dev_err(&ts->client->dev, 1276 "Failed to flash firmware: %d\n", error); 1277 1278 /* Enable IRQ */ 1279 if (input_device_enabled(ts->input)) 1280 enable_irq(ts->client->irq); 1281 else 1282 mip4_power_off(ts); 1283 1284 return error ? error : 0; 1285 } 1286 mip4_sysfs_fw_update(struct device * dev,struct device_attribute * attr,const char * buf,size_t count)1287 static ssize_t mip4_sysfs_fw_update(struct device *dev, 1288 struct device_attribute *attr, 1289 const char *buf, size_t count) 1290 { 1291 struct i2c_client *client = to_i2c_client(dev); 1292 struct mip4_ts *ts = i2c_get_clientdata(client); 1293 const struct firmware *fw; 1294 int error; 1295 1296 error = request_firmware(&fw, ts->fw_name, dev); 1297 if (error) { 1298 dev_err(&ts->client->dev, 1299 "Failed to retrieve firmware %s: %d\n", 1300 ts->fw_name, error); 1301 return error; 1302 } 1303 1304 /* 1305 * Take input mutex to prevent racing with itself and also with 1306 * userspace opening and closing the device and also suspend/resume 1307 * transitions. 1308 */ 1309 mutex_lock(&ts->input->mutex); 1310 1311 error = mip4_execute_fw_update(ts, fw); 1312 1313 mutex_unlock(&ts->input->mutex); 1314 1315 release_firmware(fw); 1316 1317 if (error) { 1318 dev_err(&ts->client->dev, 1319 "Firmware update failed: %d\n", error); 1320 return error; 1321 } 1322 1323 return count; 1324 } 1325 1326 static DEVICE_ATTR(update_fw, S_IWUSR, NULL, mip4_sysfs_fw_update); 1327 mip4_sysfs_read_fw_version(struct device * dev,struct device_attribute * attr,char * buf)1328 static ssize_t mip4_sysfs_read_fw_version(struct device *dev, 1329 struct device_attribute *attr, 1330 char *buf) 1331 { 1332 struct i2c_client *client = to_i2c_client(dev); 1333 struct mip4_ts *ts = i2c_get_clientdata(client); 1334 size_t count; 1335 1336 /* Take lock to prevent racing with firmware update */ 1337 mutex_lock(&ts->input->mutex); 1338 1339 count = sysfs_emit(buf, "%04X %04X %04X %04X\n", 1340 ts->fw_version.boot, ts->fw_version.core, 1341 ts->fw_version.app, ts->fw_version.param); 1342 1343 mutex_unlock(&ts->input->mutex); 1344 1345 return count; 1346 } 1347 1348 static DEVICE_ATTR(fw_version, S_IRUGO, mip4_sysfs_read_fw_version, NULL); 1349 mip4_sysfs_read_hw_version(struct device * dev,struct device_attribute * attr,char * buf)1350 static ssize_t mip4_sysfs_read_hw_version(struct device *dev, 1351 struct device_attribute *attr, 1352 char *buf) 1353 { 1354 struct i2c_client *client = to_i2c_client(dev); 1355 struct mip4_ts *ts = i2c_get_clientdata(client); 1356 size_t count; 1357 1358 /* Take lock to prevent racing with firmware update */ 1359 mutex_lock(&ts->input->mutex); 1360 1361 /* 1362 * product_name shows the name or version of the hardware 1363 * paired with current firmware in the chip. 1364 */ 1365 count = sysfs_emit(buf, "%.*s\n", 1366 (int)sizeof(ts->product_name), ts->product_name); 1367 1368 mutex_unlock(&ts->input->mutex); 1369 1370 return count; 1371 } 1372 1373 static DEVICE_ATTR(hw_version, S_IRUGO, mip4_sysfs_read_hw_version, NULL); 1374 mip4_sysfs_read_product_id(struct device * dev,struct device_attribute * attr,char * buf)1375 static ssize_t mip4_sysfs_read_product_id(struct device *dev, 1376 struct device_attribute *attr, 1377 char *buf) 1378 { 1379 struct i2c_client *client = to_i2c_client(dev); 1380 struct mip4_ts *ts = i2c_get_clientdata(client); 1381 size_t count; 1382 1383 mutex_lock(&ts->input->mutex); 1384 1385 count = sysfs_emit(buf, "%04X\n", ts->product_id); 1386 1387 mutex_unlock(&ts->input->mutex); 1388 1389 return count; 1390 } 1391 1392 static DEVICE_ATTR(product_id, S_IRUGO, mip4_sysfs_read_product_id, NULL); 1393 mip4_sysfs_read_ic_name(struct device * dev,struct device_attribute * attr,char * buf)1394 static ssize_t mip4_sysfs_read_ic_name(struct device *dev, 1395 struct device_attribute *attr, 1396 char *buf) 1397 { 1398 struct i2c_client *client = to_i2c_client(dev); 1399 struct mip4_ts *ts = i2c_get_clientdata(client); 1400 size_t count; 1401 1402 mutex_lock(&ts->input->mutex); 1403 1404 count = sysfs_emit(buf, "%.*s\n", 1405 (int)sizeof(ts->ic_name), ts->ic_name); 1406 1407 mutex_unlock(&ts->input->mutex); 1408 1409 return count; 1410 } 1411 1412 static DEVICE_ATTR(ic_name, S_IRUGO, mip4_sysfs_read_ic_name, NULL); 1413 1414 static struct attribute *mip4_attrs[] = { 1415 &dev_attr_fw_version.attr, 1416 &dev_attr_hw_version.attr, 1417 &dev_attr_product_id.attr, 1418 &dev_attr_ic_name.attr, 1419 &dev_attr_update_fw.attr, 1420 NULL, 1421 }; 1422 ATTRIBUTE_GROUPS(mip4); 1423 mip4_probe(struct i2c_client * client)1424 static int mip4_probe(struct i2c_client *client) 1425 { 1426 struct mip4_ts *ts; 1427 struct input_dev *input; 1428 int error; 1429 1430 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { 1431 dev_err(&client->dev, "Not supported I2C adapter\n"); 1432 return -ENXIO; 1433 } 1434 1435 ts = devm_kzalloc(&client->dev, sizeof(*ts), GFP_KERNEL); 1436 if (!ts) 1437 return -ENOMEM; 1438 1439 input = devm_input_allocate_device(&client->dev); 1440 if (!input) 1441 return -ENOMEM; 1442 1443 ts->client = client; 1444 ts->input = input; 1445 1446 snprintf(ts->phys, sizeof(ts->phys), 1447 "%s/input0", dev_name(&client->dev)); 1448 1449 ts->gpio_ce = devm_gpiod_get_optional(&client->dev, 1450 "ce", GPIOD_OUT_LOW); 1451 if (IS_ERR(ts->gpio_ce)) 1452 return dev_err_probe(&client->dev, PTR_ERR(ts->gpio_ce), "Failed to get gpio\n"); 1453 1454 error = mip4_power_on(ts); 1455 if (error) 1456 return error; 1457 error = mip4_query_device(ts); 1458 mip4_power_off(ts); 1459 if (error) 1460 return error; 1461 1462 input->name = "MELFAS MIP4 Touchscreen"; 1463 input->phys = ts->phys; 1464 1465 input->id.bustype = BUS_I2C; 1466 input->id.vendor = 0x13c5; 1467 input->id.product = ts->product_id; 1468 1469 input->open = mip4_input_open; 1470 input->close = mip4_input_close; 1471 1472 input_set_drvdata(input, ts); 1473 1474 input->keycode = ts->key_code; 1475 input->keycodesize = sizeof(*ts->key_code); 1476 input->keycodemax = ts->key_num; 1477 1478 input_set_abs_params(input, ABS_MT_TOOL_TYPE, 0, MT_TOOL_PALM, 0, 0); 1479 input_set_abs_params(input, ABS_MT_POSITION_X, 0, ts->max_x, 0, 0); 1480 input_set_abs_params(input, ABS_MT_POSITION_Y, 0, ts->max_y, 0, 0); 1481 input_set_abs_params(input, ABS_MT_PRESSURE, 1482 MIP4_PRESSURE_MIN, MIP4_PRESSURE_MAX, 0, 0); 1483 input_set_abs_params(input, ABS_MT_TOUCH_MAJOR, 1484 MIP4_TOUCH_MAJOR_MIN, MIP4_TOUCH_MAJOR_MAX, 0, 0); 1485 input_set_abs_params(input, ABS_MT_TOUCH_MINOR, 1486 MIP4_TOUCH_MINOR_MIN, MIP4_TOUCH_MINOR_MAX, 0, 0); 1487 input_abs_set_res(ts->input, ABS_MT_POSITION_X, ts->ppm_x); 1488 input_abs_set_res(ts->input, ABS_MT_POSITION_Y, ts->ppm_y); 1489 1490 error = input_mt_init_slots(input, MIP4_MAX_FINGERS, INPUT_MT_DIRECT); 1491 if (error) 1492 return error; 1493 1494 i2c_set_clientdata(client, ts); 1495 1496 error = devm_request_threaded_irq(&client->dev, client->irq, 1497 NULL, mip4_interrupt, 1498 IRQF_ONESHOT | IRQF_NO_AUTOEN, 1499 MIP4_DEVICE_NAME, ts); 1500 if (error) { 1501 dev_err(&client->dev, 1502 "Failed to request interrupt %d: %d\n", 1503 client->irq, error); 1504 return error; 1505 } 1506 1507 error = input_register_device(input); 1508 if (error) { 1509 dev_err(&client->dev, 1510 "Failed to register input device: %d\n", error); 1511 return error; 1512 } 1513 1514 return 0; 1515 } 1516 mip4_suspend(struct device * dev)1517 static int mip4_suspend(struct device *dev) 1518 { 1519 struct i2c_client *client = to_i2c_client(dev); 1520 struct mip4_ts *ts = i2c_get_clientdata(client); 1521 struct input_dev *input = ts->input; 1522 1523 mutex_lock(&input->mutex); 1524 1525 if (device_may_wakeup(dev)) 1526 ts->wake_irq_enabled = enable_irq_wake(client->irq) == 0; 1527 else if (input_device_enabled(input)) 1528 mip4_disable(ts); 1529 1530 mutex_unlock(&input->mutex); 1531 1532 return 0; 1533 } 1534 mip4_resume(struct device * dev)1535 static int mip4_resume(struct device *dev) 1536 { 1537 struct i2c_client *client = to_i2c_client(dev); 1538 struct mip4_ts *ts = i2c_get_clientdata(client); 1539 struct input_dev *input = ts->input; 1540 1541 mutex_lock(&input->mutex); 1542 1543 if (ts->wake_irq_enabled) 1544 disable_irq_wake(client->irq); 1545 else if (input_device_enabled(input)) 1546 mip4_enable(ts); 1547 1548 mutex_unlock(&input->mutex); 1549 1550 return 0; 1551 } 1552 1553 static DEFINE_SIMPLE_DEV_PM_OPS(mip4_pm_ops, mip4_suspend, mip4_resume); 1554 1555 #ifdef CONFIG_OF 1556 static const struct of_device_id mip4_of_match[] = { 1557 { .compatible = "melfas,"MIP4_DEVICE_NAME, }, 1558 { }, 1559 }; 1560 MODULE_DEVICE_TABLE(of, mip4_of_match); 1561 #endif 1562 1563 #ifdef CONFIG_ACPI 1564 static const struct acpi_device_id mip4_acpi_match[] = { 1565 { "MLFS0000", 0}, 1566 { }, 1567 }; 1568 MODULE_DEVICE_TABLE(acpi, mip4_acpi_match); 1569 #endif 1570 1571 static const struct i2c_device_id mip4_i2c_ids[] = { 1572 { MIP4_DEVICE_NAME }, 1573 { } 1574 }; 1575 MODULE_DEVICE_TABLE(i2c, mip4_i2c_ids); 1576 1577 static struct i2c_driver mip4_driver = { 1578 .id_table = mip4_i2c_ids, 1579 .probe = mip4_probe, 1580 .driver = { 1581 .name = MIP4_DEVICE_NAME, 1582 .dev_groups = mip4_groups, 1583 .of_match_table = of_match_ptr(mip4_of_match), 1584 .acpi_match_table = ACPI_PTR(mip4_acpi_match), 1585 .pm = pm_sleep_ptr(&mip4_pm_ops), 1586 }, 1587 }; 1588 module_i2c_driver(mip4_driver); 1589 1590 MODULE_DESCRIPTION("MELFAS MIP4 Touchscreen"); 1591 MODULE_AUTHOR("Sangwon Jee <jeesw@melfas.com>"); 1592 MODULE_LICENSE("GPL"); 1593