1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Azoteq IQS620A/621/622/624/625 Multi-Function Sensors 4 * 5 * Copyright (C) 2019 Jeff LaBundy <jeff@labundy.com> 6 * 7 * These devices rely on application-specific register settings and calibration 8 * data developed in and exported from a suite of GUIs offered by the vendor. A 9 * separate tool converts the GUIs' ASCII-based output into a standard firmware 10 * file parsed by the driver. 11 * 12 * Link to datasheets and GUIs: https://www.azoteq.com/ 13 * 14 * Link to conversion tool: https://github.com/jlabundy/iqs62x-h2bin.git 15 */ 16 17 #include <linux/completion.h> 18 #include <linux/delay.h> 19 #include <linux/device.h> 20 #include <linux/err.h> 21 #include <linux/firmware.h> 22 #include <linux/i2c.h> 23 #include <linux/interrupt.h> 24 #include <linux/kernel.h> 25 #include <linux/list.h> 26 #include <linux/mfd/core.h> 27 #include <linux/mfd/iqs62x.h> 28 #include <linux/module.h> 29 #include <linux/notifier.h> 30 #include <linux/of_device.h> 31 #include <linux/property.h> 32 #include <linux/regmap.h> 33 #include <linux/slab.h> 34 #include <asm/unaligned.h> 35 36 #define IQS62X_PROD_NUM 0x00 37 38 #define IQS62X_SYS_FLAGS 0x10 39 40 #define IQS620_HALL_FLAGS 0x16 41 #define IQS621_HALL_FLAGS 0x19 42 #define IQS622_HALL_FLAGS IQS621_HALL_FLAGS 43 44 #define IQS624_INTERVAL_NUM 0x18 45 #define IQS625_INTERVAL_NUM 0x12 46 47 #define IQS622_PROX_SETTINGS_4 0x48 48 #define IQS620_PROX_SETTINGS_4 0x50 49 #define IQS620_PROX_SETTINGS_4_SAR_EN BIT(7) 50 51 #define IQS621_ALS_CAL_DIV_LUX 0x82 52 #define IQS621_ALS_CAL_DIV_IR 0x83 53 54 #define IQS620_TEMP_CAL_MULT 0xC2 55 #define IQS620_TEMP_CAL_DIV 0xC3 56 #define IQS620_TEMP_CAL_OFFS 0xC4 57 58 #define IQS62X_SYS_SETTINGS 0xD0 59 #define IQS62X_SYS_SETTINGS_ACK_RESET BIT(6) 60 #define IQS62X_SYS_SETTINGS_EVENT_MODE BIT(5) 61 #define IQS62X_SYS_SETTINGS_CLK_DIV BIT(4) 62 #define IQS62X_SYS_SETTINGS_COMM_ATI BIT(3) 63 #define IQS62X_SYS_SETTINGS_REDO_ATI BIT(1) 64 65 #define IQS62X_PWR_SETTINGS 0xD2 66 #define IQS62X_PWR_SETTINGS_DIS_AUTO BIT(5) 67 #define IQS62X_PWR_SETTINGS_PWR_MODE_MASK (BIT(4) | BIT(3)) 68 #define IQS62X_PWR_SETTINGS_PWR_MODE_HALT (BIT(4) | BIT(3)) 69 #define IQS62X_PWR_SETTINGS_PWR_MODE_NORM 0 70 71 #define IQS62X_OTP_CMD 0xF0 72 #define IQS62X_OTP_CMD_FG3 0x13 73 #define IQS62X_OTP_DATA 0xF1 74 #define IQS62X_MAX_REG 0xFF 75 76 #define IQS62X_HALL_CAL_MASK GENMASK(3, 0) 77 78 #define IQS62X_FW_REC_TYPE_INFO 0 79 #define IQS62X_FW_REC_TYPE_PROD 1 80 #define IQS62X_FW_REC_TYPE_HALL 2 81 #define IQS62X_FW_REC_TYPE_MASK 3 82 #define IQS62X_FW_REC_TYPE_DATA 4 83 84 #define IQS62X_ATI_STARTUP_MS 350 85 #define IQS62X_FILT_SETTLE_MS 250 86 87 struct iqs62x_fw_rec { 88 u8 type; 89 u8 addr; 90 u8 len; 91 u8 data; 92 } __packed; 93 94 struct iqs62x_fw_blk { 95 struct list_head list; 96 u8 addr; 97 u8 mask; 98 u8 len; 99 u8 data[]; 100 }; 101 102 struct iqs62x_info { 103 u8 prod_num; 104 u8 sw_num; 105 u8 hw_num; 106 } __packed; 107 108 static int iqs62x_dev_init(struct iqs62x_core *iqs62x) 109 { 110 struct iqs62x_fw_blk *fw_blk; 111 unsigned int val; 112 int ret; 113 114 list_for_each_entry(fw_blk, &iqs62x->fw_blk_head, list) { 115 /* 116 * In case ATI is in progress, wait for it to complete before 117 * lowering the core clock frequency. 118 */ 119 if (fw_blk->addr == IQS62X_SYS_SETTINGS && 120 *fw_blk->data & IQS62X_SYS_SETTINGS_CLK_DIV) 121 msleep(IQS62X_ATI_STARTUP_MS); 122 123 if (fw_blk->mask) 124 ret = regmap_update_bits(iqs62x->regmap, fw_blk->addr, 125 fw_blk->mask, *fw_blk->data); 126 else 127 ret = regmap_raw_write(iqs62x->regmap, fw_blk->addr, 128 fw_blk->data, fw_blk->len); 129 if (ret) 130 return ret; 131 } 132 133 switch (iqs62x->dev_desc->prod_num) { 134 case IQS620_PROD_NUM: 135 case IQS622_PROD_NUM: 136 ret = regmap_read(iqs62x->regmap, 137 iqs62x->dev_desc->prox_settings, &val); 138 if (ret) 139 return ret; 140 141 if (val & IQS620_PROX_SETTINGS_4_SAR_EN) 142 iqs62x->ui_sel = IQS62X_UI_SAR1; 143 fallthrough; 144 145 case IQS621_PROD_NUM: 146 ret = regmap_write(iqs62x->regmap, IQS620_GLBL_EVENT_MASK, 147 IQS620_GLBL_EVENT_MASK_PMU | 148 iqs62x->dev_desc->prox_mask | 149 iqs62x->dev_desc->sar_mask | 150 iqs62x->dev_desc->hall_mask | 151 iqs62x->dev_desc->hyst_mask | 152 iqs62x->dev_desc->temp_mask | 153 iqs62x->dev_desc->als_mask | 154 iqs62x->dev_desc->ir_mask); 155 if (ret) 156 return ret; 157 break; 158 159 default: 160 ret = regmap_write(iqs62x->regmap, IQS624_HALL_UI, 161 IQS624_HALL_UI_WHL_EVENT | 162 IQS624_HALL_UI_INT_EVENT | 163 IQS624_HALL_UI_AUTO_CAL); 164 if (ret) 165 return ret; 166 167 /* 168 * The IQS625 default interval divider is below the minimum 169 * permissible value, and the datasheet mandates that it is 170 * corrected during initialization (unless an updated value 171 * has already been provided by firmware). 172 * 173 * To protect against an unacceptably low user-entered value 174 * stored in the firmware, the same check is extended to the 175 * IQS624 as well. 176 */ 177 ret = regmap_read(iqs62x->regmap, IQS624_INTERVAL_DIV, &val); 178 if (ret) 179 return ret; 180 181 if (val >= iqs62x->dev_desc->interval_div) 182 break; 183 184 ret = regmap_write(iqs62x->regmap, IQS624_INTERVAL_DIV, 185 iqs62x->dev_desc->interval_div); 186 if (ret) 187 return ret; 188 } 189 190 /* 191 * Place the device in streaming mode at first so as not to miss the 192 * limited number of interrupts that would otherwise occur after ATI 193 * completes. The device is subsequently placed in event mode by the 194 * interrupt handler. 195 * 196 * In the meantime, mask interrupts during ATI to prevent the device 197 * from soliciting I2C traffic until the noise-sensitive ATI process 198 * is complete. 199 */ 200 ret = regmap_update_bits(iqs62x->regmap, IQS62X_SYS_SETTINGS, 201 IQS62X_SYS_SETTINGS_ACK_RESET | 202 IQS62X_SYS_SETTINGS_EVENT_MODE | 203 IQS62X_SYS_SETTINGS_COMM_ATI | 204 IQS62X_SYS_SETTINGS_REDO_ATI, 205 IQS62X_SYS_SETTINGS_ACK_RESET | 206 IQS62X_SYS_SETTINGS_REDO_ATI); 207 if (ret) 208 return ret; 209 210 /* 211 * The following delay gives the device time to deassert its RDY output 212 * in case a communication window was open while the REDO_ATI field was 213 * written. This prevents an interrupt from being serviced prematurely. 214 */ 215 usleep_range(5000, 5100); 216 217 return 0; 218 } 219 220 static int iqs62x_firmware_parse(struct iqs62x_core *iqs62x, 221 const struct firmware *fw) 222 { 223 struct i2c_client *client = iqs62x->client; 224 struct iqs62x_fw_rec *fw_rec; 225 struct iqs62x_fw_blk *fw_blk; 226 unsigned int val; 227 size_t pos = 0; 228 int ret = 0; 229 u8 mask, len, *data; 230 u8 hall_cal_index = 0; 231 232 while (pos < fw->size) { 233 if (pos + sizeof(*fw_rec) > fw->size) { 234 ret = -EINVAL; 235 break; 236 } 237 fw_rec = (struct iqs62x_fw_rec *)(fw->data + pos); 238 pos += sizeof(*fw_rec); 239 240 if (pos + fw_rec->len - 1 > fw->size) { 241 ret = -EINVAL; 242 break; 243 } 244 pos += fw_rec->len - 1; 245 246 switch (fw_rec->type) { 247 case IQS62X_FW_REC_TYPE_INFO: 248 continue; 249 250 case IQS62X_FW_REC_TYPE_PROD: 251 if (fw_rec->data == iqs62x->dev_desc->prod_num) 252 continue; 253 254 dev_err(&client->dev, 255 "Incompatible product number: 0x%02X\n", 256 fw_rec->data); 257 ret = -EINVAL; 258 break; 259 260 case IQS62X_FW_REC_TYPE_HALL: 261 if (!hall_cal_index) { 262 ret = regmap_write(iqs62x->regmap, 263 IQS62X_OTP_CMD, 264 IQS62X_OTP_CMD_FG3); 265 if (ret) 266 break; 267 268 ret = regmap_read(iqs62x->regmap, 269 IQS62X_OTP_DATA, &val); 270 if (ret) 271 break; 272 273 hall_cal_index = val & IQS62X_HALL_CAL_MASK; 274 if (!hall_cal_index) { 275 dev_err(&client->dev, 276 "Uncalibrated device\n"); 277 ret = -ENODATA; 278 break; 279 } 280 } 281 282 if (hall_cal_index > fw_rec->len) { 283 ret = -EINVAL; 284 break; 285 } 286 287 mask = 0; 288 data = &fw_rec->data + hall_cal_index - 1; 289 len = sizeof(*data); 290 break; 291 292 case IQS62X_FW_REC_TYPE_MASK: 293 if (fw_rec->len < (sizeof(mask) + sizeof(*data))) { 294 ret = -EINVAL; 295 break; 296 } 297 298 mask = fw_rec->data; 299 data = &fw_rec->data + sizeof(mask); 300 len = sizeof(*data); 301 break; 302 303 case IQS62X_FW_REC_TYPE_DATA: 304 mask = 0; 305 data = &fw_rec->data; 306 len = fw_rec->len; 307 break; 308 309 default: 310 dev_err(&client->dev, 311 "Unrecognized record type: 0x%02X\n", 312 fw_rec->type); 313 ret = -EINVAL; 314 } 315 316 if (ret) 317 break; 318 319 fw_blk = devm_kzalloc(&client->dev, 320 struct_size(fw_blk, data, len), 321 GFP_KERNEL); 322 if (!fw_blk) { 323 ret = -ENOMEM; 324 break; 325 } 326 327 fw_blk->addr = fw_rec->addr; 328 fw_blk->mask = mask; 329 fw_blk->len = len; 330 memcpy(fw_blk->data, data, len); 331 332 list_add(&fw_blk->list, &iqs62x->fw_blk_head); 333 } 334 335 release_firmware(fw); 336 337 return ret; 338 } 339 340 const struct iqs62x_event_desc iqs62x_events[IQS62X_NUM_EVENTS] = { 341 [IQS62X_EVENT_PROX_CH0_T] = { 342 .reg = IQS62X_EVENT_PROX, 343 .mask = BIT(4), 344 .val = BIT(4), 345 }, 346 [IQS62X_EVENT_PROX_CH0_P] = { 347 .reg = IQS62X_EVENT_PROX, 348 .mask = BIT(0), 349 .val = BIT(0), 350 }, 351 [IQS62X_EVENT_PROX_CH1_T] = { 352 .reg = IQS62X_EVENT_PROX, 353 .mask = BIT(5), 354 .val = BIT(5), 355 }, 356 [IQS62X_EVENT_PROX_CH1_P] = { 357 .reg = IQS62X_EVENT_PROX, 358 .mask = BIT(1), 359 .val = BIT(1), 360 }, 361 [IQS62X_EVENT_PROX_CH2_T] = { 362 .reg = IQS62X_EVENT_PROX, 363 .mask = BIT(6), 364 .val = BIT(6), 365 }, 366 [IQS62X_EVENT_PROX_CH2_P] = { 367 .reg = IQS62X_EVENT_PROX, 368 .mask = BIT(2), 369 .val = BIT(2), 370 }, 371 [IQS62X_EVENT_HYST_POS_T] = { 372 .reg = IQS62X_EVENT_HYST, 373 .mask = BIT(6) | BIT(7), 374 .val = BIT(6), 375 }, 376 [IQS62X_EVENT_HYST_POS_P] = { 377 .reg = IQS62X_EVENT_HYST, 378 .mask = BIT(5) | BIT(7), 379 .val = BIT(5), 380 }, 381 [IQS62X_EVENT_HYST_NEG_T] = { 382 .reg = IQS62X_EVENT_HYST, 383 .mask = BIT(6) | BIT(7), 384 .val = BIT(6) | BIT(7), 385 }, 386 [IQS62X_EVENT_HYST_NEG_P] = { 387 .reg = IQS62X_EVENT_HYST, 388 .mask = BIT(5) | BIT(7), 389 .val = BIT(5) | BIT(7), 390 }, 391 [IQS62X_EVENT_SAR1_ACT] = { 392 .reg = IQS62X_EVENT_HYST, 393 .mask = BIT(4), 394 .val = BIT(4), 395 }, 396 [IQS62X_EVENT_SAR1_QRD] = { 397 .reg = IQS62X_EVENT_HYST, 398 .mask = BIT(2), 399 .val = BIT(2), 400 }, 401 [IQS62X_EVENT_SAR1_MOVE] = { 402 .reg = IQS62X_EVENT_HYST, 403 .mask = BIT(1), 404 .val = BIT(1), 405 }, 406 [IQS62X_EVENT_SAR1_HALT] = { 407 .reg = IQS62X_EVENT_HYST, 408 .mask = BIT(0), 409 .val = BIT(0), 410 }, 411 [IQS62X_EVENT_WHEEL_UP] = { 412 .reg = IQS62X_EVENT_WHEEL, 413 .mask = BIT(7) | BIT(6), 414 .val = BIT(7), 415 }, 416 [IQS62X_EVENT_WHEEL_DN] = { 417 .reg = IQS62X_EVENT_WHEEL, 418 .mask = BIT(7) | BIT(6), 419 .val = BIT(7) | BIT(6), 420 }, 421 [IQS62X_EVENT_HALL_N_T] = { 422 .reg = IQS62X_EVENT_HALL, 423 .mask = BIT(2) | BIT(0), 424 .val = BIT(2), 425 }, 426 [IQS62X_EVENT_HALL_N_P] = { 427 .reg = IQS62X_EVENT_HALL, 428 .mask = BIT(1) | BIT(0), 429 .val = BIT(1), 430 }, 431 [IQS62X_EVENT_HALL_S_T] = { 432 .reg = IQS62X_EVENT_HALL, 433 .mask = BIT(2) | BIT(0), 434 .val = BIT(2) | BIT(0), 435 }, 436 [IQS62X_EVENT_HALL_S_P] = { 437 .reg = IQS62X_EVENT_HALL, 438 .mask = BIT(1) | BIT(0), 439 .val = BIT(1) | BIT(0), 440 }, 441 [IQS62X_EVENT_SYS_RESET] = { 442 .reg = IQS62X_EVENT_SYS, 443 .mask = BIT(7), 444 .val = BIT(7), 445 }, 446 [IQS62X_EVENT_SYS_ATI] = { 447 .reg = IQS62X_EVENT_SYS, 448 .mask = BIT(2), 449 .val = BIT(2), 450 }, 451 }; 452 EXPORT_SYMBOL_GPL(iqs62x_events); 453 454 static irqreturn_t iqs62x_irq(int irq, void *context) 455 { 456 struct iqs62x_core *iqs62x = context; 457 struct i2c_client *client = iqs62x->client; 458 struct iqs62x_event_data event_data; 459 struct iqs62x_event_desc event_desc; 460 enum iqs62x_event_reg event_reg; 461 unsigned long event_flags = 0; 462 int ret, i, j; 463 u8 event_map[IQS62X_EVENT_SIZE]; 464 465 /* 466 * The device asserts the RDY output to signal the beginning of a 467 * communication window, which is closed by an I2C stop condition. 468 * As such, all interrupt status is captured in a single read and 469 * broadcast to any interested sub-device drivers. 470 */ 471 ret = regmap_raw_read(iqs62x->regmap, IQS62X_SYS_FLAGS, event_map, 472 sizeof(event_map)); 473 if (ret) { 474 dev_err(&client->dev, "Failed to read device status: %d\n", 475 ret); 476 return IRQ_NONE; 477 } 478 479 for (i = 0; i < sizeof(event_map); i++) { 480 event_reg = iqs62x->dev_desc->event_regs[iqs62x->ui_sel][i]; 481 482 switch (event_reg) { 483 case IQS62X_EVENT_UI_LO: 484 event_data.ui_data = get_unaligned_le16(&event_map[i]); 485 fallthrough; 486 487 case IQS62X_EVENT_UI_HI: 488 case IQS62X_EVENT_NONE: 489 continue; 490 491 case IQS62X_EVENT_ALS: 492 event_data.als_flags = event_map[i]; 493 continue; 494 495 case IQS62X_EVENT_IR: 496 event_data.ir_flags = event_map[i]; 497 continue; 498 499 case IQS62X_EVENT_INTER: 500 event_data.interval = event_map[i]; 501 continue; 502 503 case IQS62X_EVENT_HYST: 504 event_map[i] <<= iqs62x->dev_desc->hyst_shift; 505 fallthrough; 506 507 case IQS62X_EVENT_WHEEL: 508 case IQS62X_EVENT_HALL: 509 case IQS62X_EVENT_PROX: 510 case IQS62X_EVENT_SYS: 511 break; 512 } 513 514 for (j = 0; j < IQS62X_NUM_EVENTS; j++) { 515 event_desc = iqs62x_events[j]; 516 517 if (event_desc.reg != event_reg) 518 continue; 519 520 if ((event_map[i] & event_desc.mask) == event_desc.val) 521 event_flags |= BIT(j); 522 } 523 } 524 525 /* 526 * The device resets itself in response to the I2C master stalling 527 * communication past a fixed timeout. In this case, all registers 528 * are restored and any interested sub-device drivers are notified. 529 */ 530 if (event_flags & BIT(IQS62X_EVENT_SYS_RESET)) { 531 dev_err(&client->dev, "Unexpected device reset\n"); 532 533 ret = iqs62x_dev_init(iqs62x); 534 if (ret) { 535 dev_err(&client->dev, 536 "Failed to re-initialize device: %d\n", ret); 537 return IRQ_NONE; 538 } 539 540 iqs62x->event_cache |= BIT(IQS62X_EVENT_SYS_RESET); 541 reinit_completion(&iqs62x->ati_done); 542 } else if (event_flags & BIT(IQS62X_EVENT_SYS_ATI)) { 543 iqs62x->event_cache |= BIT(IQS62X_EVENT_SYS_ATI); 544 reinit_completion(&iqs62x->ati_done); 545 } else if (!completion_done(&iqs62x->ati_done)) { 546 ret = regmap_update_bits(iqs62x->regmap, IQS62X_SYS_SETTINGS, 547 IQS62X_SYS_SETTINGS_EVENT_MODE, 0xFF); 548 if (ret) { 549 dev_err(&client->dev, 550 "Failed to enable event mode: %d\n", ret); 551 return IRQ_NONE; 552 } 553 554 msleep(IQS62X_FILT_SETTLE_MS); 555 complete_all(&iqs62x->ati_done); 556 } 557 558 /* 559 * Reset and ATI events are not broadcast to the sub-device drivers 560 * until ATI has completed. Any other events that may have occurred 561 * during ATI are ignored. 562 */ 563 if (completion_done(&iqs62x->ati_done)) { 564 event_flags |= iqs62x->event_cache; 565 ret = blocking_notifier_call_chain(&iqs62x->nh, event_flags, 566 &event_data); 567 if (ret & NOTIFY_STOP_MASK) 568 return IRQ_NONE; 569 570 iqs62x->event_cache = 0; 571 } 572 573 /* 574 * Once the communication window is closed, a small delay is added to 575 * ensure the device's RDY output has been deasserted by the time the 576 * interrupt handler returns. 577 */ 578 usleep_range(150, 200); 579 580 return IRQ_HANDLED; 581 } 582 583 static void iqs62x_firmware_load(const struct firmware *fw, void *context) 584 { 585 struct iqs62x_core *iqs62x = context; 586 struct i2c_client *client = iqs62x->client; 587 int ret; 588 589 if (fw) { 590 ret = iqs62x_firmware_parse(iqs62x, fw); 591 if (ret) { 592 dev_err(&client->dev, "Failed to parse firmware: %d\n", 593 ret); 594 goto err_out; 595 } 596 } 597 598 ret = iqs62x_dev_init(iqs62x); 599 if (ret) { 600 dev_err(&client->dev, "Failed to initialize device: %d\n", ret); 601 goto err_out; 602 } 603 604 ret = devm_request_threaded_irq(&client->dev, client->irq, 605 NULL, iqs62x_irq, IRQF_ONESHOT, 606 client->name, iqs62x); 607 if (ret) { 608 dev_err(&client->dev, "Failed to request IRQ: %d\n", ret); 609 goto err_out; 610 } 611 612 if (!wait_for_completion_timeout(&iqs62x->ati_done, 613 msecs_to_jiffies(2000))) { 614 dev_err(&client->dev, "Failed to complete ATI\n"); 615 goto err_out; 616 } 617 618 ret = devm_mfd_add_devices(&client->dev, PLATFORM_DEVID_NONE, 619 iqs62x->dev_desc->sub_devs, 620 iqs62x->dev_desc->num_sub_devs, 621 NULL, 0, NULL); 622 if (ret) 623 dev_err(&client->dev, "Failed to add sub-devices: %d\n", ret); 624 625 err_out: 626 complete_all(&iqs62x->fw_done); 627 } 628 629 static const struct mfd_cell iqs620at_sub_devs[] = { 630 { 631 .name = "iqs62x-keys", 632 .of_compatible = "azoteq,iqs620a-keys", 633 }, 634 { 635 .name = "iqs620a-pwm", 636 .of_compatible = "azoteq,iqs620a-pwm", 637 }, 638 { .name = "iqs620at-temp", }, 639 }; 640 641 static const struct mfd_cell iqs620a_sub_devs[] = { 642 { 643 .name = "iqs62x-keys", 644 .of_compatible = "azoteq,iqs620a-keys", 645 }, 646 { 647 .name = "iqs620a-pwm", 648 .of_compatible = "azoteq,iqs620a-pwm", 649 }, 650 }; 651 652 static const struct mfd_cell iqs621_sub_devs[] = { 653 { 654 .name = "iqs62x-keys", 655 .of_compatible = "azoteq,iqs621-keys", 656 }, 657 { .name = "iqs621-als", }, 658 }; 659 660 static const struct mfd_cell iqs622_sub_devs[] = { 661 { 662 .name = "iqs62x-keys", 663 .of_compatible = "azoteq,iqs622-keys", 664 }, 665 { .name = "iqs621-als", }, 666 }; 667 668 static const struct mfd_cell iqs624_sub_devs[] = { 669 { 670 .name = "iqs62x-keys", 671 .of_compatible = "azoteq,iqs624-keys", 672 }, 673 { .name = "iqs624-pos", }, 674 }; 675 676 static const struct mfd_cell iqs625_sub_devs[] = { 677 { 678 .name = "iqs62x-keys", 679 .of_compatible = "azoteq,iqs625-keys", 680 }, 681 { .name = "iqs624-pos", }, 682 }; 683 684 static const u8 iqs620at_cal_regs[] = { 685 IQS620_TEMP_CAL_MULT, 686 IQS620_TEMP_CAL_DIV, 687 IQS620_TEMP_CAL_OFFS, 688 }; 689 690 static const u8 iqs621_cal_regs[] = { 691 IQS621_ALS_CAL_DIV_LUX, 692 IQS621_ALS_CAL_DIV_IR, 693 }; 694 695 static const enum iqs62x_event_reg iqs620a_event_regs[][IQS62X_EVENT_SIZE] = { 696 [IQS62X_UI_PROX] = { 697 IQS62X_EVENT_SYS, /* 0x10 */ 698 IQS62X_EVENT_NONE, 699 IQS62X_EVENT_PROX, /* 0x12 */ 700 IQS62X_EVENT_HYST, /* 0x13 */ 701 IQS62X_EVENT_NONE, 702 IQS62X_EVENT_NONE, 703 IQS62X_EVENT_HALL, /* 0x16 */ 704 IQS62X_EVENT_NONE, 705 IQS62X_EVENT_NONE, 706 IQS62X_EVENT_NONE, 707 }, 708 [IQS62X_UI_SAR1] = { 709 IQS62X_EVENT_SYS, /* 0x10 */ 710 IQS62X_EVENT_NONE, 711 IQS62X_EVENT_NONE, 712 IQS62X_EVENT_HYST, /* 0x13 */ 713 IQS62X_EVENT_NONE, 714 IQS62X_EVENT_NONE, 715 IQS62X_EVENT_HALL, /* 0x16 */ 716 IQS62X_EVENT_NONE, 717 IQS62X_EVENT_NONE, 718 IQS62X_EVENT_NONE, 719 }, 720 }; 721 722 static const enum iqs62x_event_reg iqs621_event_regs[][IQS62X_EVENT_SIZE] = { 723 [IQS62X_UI_PROX] = { 724 IQS62X_EVENT_SYS, /* 0x10 */ 725 IQS62X_EVENT_NONE, 726 IQS62X_EVENT_PROX, /* 0x12 */ 727 IQS62X_EVENT_HYST, /* 0x13 */ 728 IQS62X_EVENT_NONE, 729 IQS62X_EVENT_NONE, 730 IQS62X_EVENT_ALS, /* 0x16 */ 731 IQS62X_EVENT_UI_LO, /* 0x17 */ 732 IQS62X_EVENT_UI_HI, /* 0x18 */ 733 IQS62X_EVENT_HALL, /* 0x19 */ 734 }, 735 }; 736 737 static const enum iqs62x_event_reg iqs622_event_regs[][IQS62X_EVENT_SIZE] = { 738 [IQS62X_UI_PROX] = { 739 IQS62X_EVENT_SYS, /* 0x10 */ 740 IQS62X_EVENT_NONE, 741 IQS62X_EVENT_PROX, /* 0x12 */ 742 IQS62X_EVENT_NONE, 743 IQS62X_EVENT_ALS, /* 0x14 */ 744 IQS62X_EVENT_NONE, 745 IQS62X_EVENT_IR, /* 0x16 */ 746 IQS62X_EVENT_UI_LO, /* 0x17 */ 747 IQS62X_EVENT_UI_HI, /* 0x18 */ 748 IQS62X_EVENT_HALL, /* 0x19 */ 749 }, 750 [IQS62X_UI_SAR1] = { 751 IQS62X_EVENT_SYS, /* 0x10 */ 752 IQS62X_EVENT_NONE, 753 IQS62X_EVENT_NONE, 754 IQS62X_EVENT_HYST, /* 0x13 */ 755 IQS62X_EVENT_ALS, /* 0x14 */ 756 IQS62X_EVENT_NONE, 757 IQS62X_EVENT_IR, /* 0x16 */ 758 IQS62X_EVENT_UI_LO, /* 0x17 */ 759 IQS62X_EVENT_UI_HI, /* 0x18 */ 760 IQS62X_EVENT_HALL, /* 0x19 */ 761 }, 762 }; 763 764 static const enum iqs62x_event_reg iqs624_event_regs[][IQS62X_EVENT_SIZE] = { 765 [IQS62X_UI_PROX] = { 766 IQS62X_EVENT_SYS, /* 0x10 */ 767 IQS62X_EVENT_NONE, 768 IQS62X_EVENT_PROX, /* 0x12 */ 769 IQS62X_EVENT_NONE, 770 IQS62X_EVENT_WHEEL, /* 0x14 */ 771 IQS62X_EVENT_NONE, 772 IQS62X_EVENT_UI_LO, /* 0x16 */ 773 IQS62X_EVENT_UI_HI, /* 0x17 */ 774 IQS62X_EVENT_INTER, /* 0x18 */ 775 IQS62X_EVENT_NONE, 776 }, 777 }; 778 779 static const enum iqs62x_event_reg iqs625_event_regs[][IQS62X_EVENT_SIZE] = { 780 [IQS62X_UI_PROX] = { 781 IQS62X_EVENT_SYS, /* 0x10 */ 782 IQS62X_EVENT_PROX, /* 0x11 */ 783 IQS62X_EVENT_INTER, /* 0x12 */ 784 IQS62X_EVENT_NONE, 785 IQS62X_EVENT_NONE, 786 IQS62X_EVENT_NONE, 787 IQS62X_EVENT_NONE, 788 IQS62X_EVENT_NONE, 789 IQS62X_EVENT_NONE, 790 IQS62X_EVENT_NONE, 791 }, 792 }; 793 794 static const struct iqs62x_dev_desc iqs62x_devs[] = { 795 { 796 .dev_name = "iqs620at", 797 .sub_devs = iqs620at_sub_devs, 798 .num_sub_devs = ARRAY_SIZE(iqs620at_sub_devs), 799 .prod_num = IQS620_PROD_NUM, 800 .sw_num = 0x08, 801 .cal_regs = iqs620at_cal_regs, 802 .num_cal_regs = ARRAY_SIZE(iqs620at_cal_regs), 803 .prox_mask = BIT(0), 804 .sar_mask = BIT(1) | BIT(7), 805 .hall_mask = BIT(2), 806 .hyst_mask = BIT(3), 807 .temp_mask = BIT(4), 808 .prox_settings = IQS620_PROX_SETTINGS_4, 809 .hall_flags = IQS620_HALL_FLAGS, 810 .fw_name = "iqs620a.bin", 811 .event_regs = &iqs620a_event_regs[IQS62X_UI_PROX], 812 }, 813 { 814 .dev_name = "iqs620a", 815 .sub_devs = iqs620a_sub_devs, 816 .num_sub_devs = ARRAY_SIZE(iqs620a_sub_devs), 817 .prod_num = IQS620_PROD_NUM, 818 .sw_num = 0x08, 819 .prox_mask = BIT(0), 820 .sar_mask = BIT(1) | BIT(7), 821 .hall_mask = BIT(2), 822 .hyst_mask = BIT(3), 823 .temp_mask = BIT(4), 824 .prox_settings = IQS620_PROX_SETTINGS_4, 825 .hall_flags = IQS620_HALL_FLAGS, 826 .fw_name = "iqs620a.bin", 827 .event_regs = &iqs620a_event_regs[IQS62X_UI_PROX], 828 }, 829 { 830 .dev_name = "iqs621", 831 .sub_devs = iqs621_sub_devs, 832 .num_sub_devs = ARRAY_SIZE(iqs621_sub_devs), 833 .prod_num = IQS621_PROD_NUM, 834 .sw_num = 0x09, 835 .cal_regs = iqs621_cal_regs, 836 .num_cal_regs = ARRAY_SIZE(iqs621_cal_regs), 837 .prox_mask = BIT(0), 838 .hall_mask = BIT(1), 839 .als_mask = BIT(2), 840 .hyst_mask = BIT(3), 841 .temp_mask = BIT(4), 842 .als_flags = IQS621_ALS_FLAGS, 843 .hall_flags = IQS621_HALL_FLAGS, 844 .hyst_shift = 5, 845 .fw_name = "iqs621.bin", 846 .event_regs = &iqs621_event_regs[IQS62X_UI_PROX], 847 }, 848 { 849 .dev_name = "iqs622", 850 .sub_devs = iqs622_sub_devs, 851 .num_sub_devs = ARRAY_SIZE(iqs622_sub_devs), 852 .prod_num = IQS622_PROD_NUM, 853 .sw_num = 0x06, 854 .prox_mask = BIT(0), 855 .sar_mask = BIT(1), 856 .hall_mask = BIT(2), 857 .als_mask = BIT(3), 858 .ir_mask = BIT(4), 859 .prox_settings = IQS622_PROX_SETTINGS_4, 860 .als_flags = IQS622_ALS_FLAGS, 861 .hall_flags = IQS622_HALL_FLAGS, 862 .fw_name = "iqs622.bin", 863 .event_regs = &iqs622_event_regs[IQS62X_UI_PROX], 864 }, 865 { 866 .dev_name = "iqs624", 867 .sub_devs = iqs624_sub_devs, 868 .num_sub_devs = ARRAY_SIZE(iqs624_sub_devs), 869 .prod_num = IQS624_PROD_NUM, 870 .sw_num = 0x0B, 871 .interval = IQS624_INTERVAL_NUM, 872 .interval_div = 3, 873 .fw_name = "iqs624.bin", 874 .event_regs = &iqs624_event_regs[IQS62X_UI_PROX], 875 }, 876 { 877 .dev_name = "iqs625", 878 .sub_devs = iqs625_sub_devs, 879 .num_sub_devs = ARRAY_SIZE(iqs625_sub_devs), 880 .prod_num = IQS625_PROD_NUM, 881 .sw_num = 0x0B, 882 .interval = IQS625_INTERVAL_NUM, 883 .interval_div = 10, 884 .fw_name = "iqs625.bin", 885 .event_regs = &iqs625_event_regs[IQS62X_UI_PROX], 886 }, 887 }; 888 889 static const struct regmap_config iqs62x_regmap_config = { 890 .reg_bits = 8, 891 .val_bits = 8, 892 .max_register = IQS62X_MAX_REG, 893 }; 894 895 static int iqs62x_probe(struct i2c_client *client) 896 { 897 struct iqs62x_core *iqs62x; 898 struct iqs62x_info info; 899 unsigned int val; 900 int ret, i, j; 901 u8 sw_num = 0; 902 const char *fw_name = NULL; 903 904 iqs62x = devm_kzalloc(&client->dev, sizeof(*iqs62x), GFP_KERNEL); 905 if (!iqs62x) 906 return -ENOMEM; 907 908 i2c_set_clientdata(client, iqs62x); 909 iqs62x->client = client; 910 911 BLOCKING_INIT_NOTIFIER_HEAD(&iqs62x->nh); 912 INIT_LIST_HEAD(&iqs62x->fw_blk_head); 913 914 init_completion(&iqs62x->ati_done); 915 init_completion(&iqs62x->fw_done); 916 917 iqs62x->regmap = devm_regmap_init_i2c(client, &iqs62x_regmap_config); 918 if (IS_ERR(iqs62x->regmap)) { 919 ret = PTR_ERR(iqs62x->regmap); 920 dev_err(&client->dev, "Failed to initialize register map: %d\n", 921 ret); 922 return ret; 923 } 924 925 ret = regmap_raw_read(iqs62x->regmap, IQS62X_PROD_NUM, &info, 926 sizeof(info)); 927 if (ret) 928 return ret; 929 930 /* 931 * The following sequence validates the device's product and software 932 * numbers. It then determines if the device is factory-calibrated by 933 * checking for nonzero values in the device's designated calibration 934 * registers (if applicable). Depending on the device, the absence of 935 * calibration data indicates a reduced feature set or invalid device. 936 * 937 * For devices given in both calibrated and uncalibrated versions, the 938 * calibrated version (e.g. IQS620AT) appears first in the iqs62x_devs 939 * array. The uncalibrated version (e.g. IQS620A) appears next and has 940 * the same product and software numbers, but no calibration registers 941 * are specified. 942 */ 943 for (i = 0; i < ARRAY_SIZE(iqs62x_devs); i++) { 944 if (info.prod_num != iqs62x_devs[i].prod_num) 945 continue; 946 947 iqs62x->dev_desc = &iqs62x_devs[i]; 948 949 if (info.sw_num < iqs62x->dev_desc->sw_num) 950 continue; 951 952 sw_num = info.sw_num; 953 954 /* 955 * Read each of the device's designated calibration registers, 956 * if any, and exit from the inner loop early if any are equal 957 * to zero (indicating the device is uncalibrated). This could 958 * be acceptable depending on the device (e.g. IQS620A instead 959 * of IQS620AT). 960 */ 961 for (j = 0; j < iqs62x->dev_desc->num_cal_regs; j++) { 962 ret = regmap_read(iqs62x->regmap, 963 iqs62x->dev_desc->cal_regs[j], &val); 964 if (ret) 965 return ret; 966 967 if (!val) 968 break; 969 } 970 971 /* 972 * If the number of nonzero values read from the device equals 973 * the number of designated calibration registers (which could 974 * be zero), exit from the outer loop early to signal that the 975 * device's product and software numbers match a known device, 976 * and the device is calibrated (if applicable). 977 */ 978 if (j == iqs62x->dev_desc->num_cal_regs) 979 break; 980 } 981 982 if (!iqs62x->dev_desc) { 983 dev_err(&client->dev, "Unrecognized product number: 0x%02X\n", 984 info.prod_num); 985 return -EINVAL; 986 } 987 988 if (!sw_num) { 989 dev_err(&client->dev, "Unrecognized software number: 0x%02X\n", 990 info.sw_num); 991 return -EINVAL; 992 } 993 994 if (i == ARRAY_SIZE(iqs62x_devs)) { 995 dev_err(&client->dev, "Uncalibrated device\n"); 996 return -ENODATA; 997 } 998 999 device_property_read_string(&client->dev, "firmware-name", &fw_name); 1000 1001 ret = request_firmware_nowait(THIS_MODULE, FW_ACTION_UEVENT, 1002 fw_name ? : iqs62x->dev_desc->fw_name, 1003 &client->dev, GFP_KERNEL, iqs62x, 1004 iqs62x_firmware_load); 1005 if (ret) 1006 dev_err(&client->dev, "Failed to request firmware: %d\n", ret); 1007 1008 return ret; 1009 } 1010 1011 static int iqs62x_remove(struct i2c_client *client) 1012 { 1013 struct iqs62x_core *iqs62x = i2c_get_clientdata(client); 1014 1015 wait_for_completion(&iqs62x->fw_done); 1016 1017 return 0; 1018 } 1019 1020 static int __maybe_unused iqs62x_suspend(struct device *dev) 1021 { 1022 struct iqs62x_core *iqs62x = dev_get_drvdata(dev); 1023 int ret; 1024 1025 wait_for_completion(&iqs62x->fw_done); 1026 1027 /* 1028 * As per the datasheet, automatic mode switching must be disabled 1029 * before the device is placed in or taken out of halt mode. 1030 */ 1031 ret = regmap_update_bits(iqs62x->regmap, IQS62X_PWR_SETTINGS, 1032 IQS62X_PWR_SETTINGS_DIS_AUTO, 0xFF); 1033 if (ret) 1034 return ret; 1035 1036 return regmap_update_bits(iqs62x->regmap, IQS62X_PWR_SETTINGS, 1037 IQS62X_PWR_SETTINGS_PWR_MODE_MASK, 1038 IQS62X_PWR_SETTINGS_PWR_MODE_HALT); 1039 } 1040 1041 static int __maybe_unused iqs62x_resume(struct device *dev) 1042 { 1043 struct iqs62x_core *iqs62x = dev_get_drvdata(dev); 1044 int ret; 1045 1046 ret = regmap_update_bits(iqs62x->regmap, IQS62X_PWR_SETTINGS, 1047 IQS62X_PWR_SETTINGS_PWR_MODE_MASK, 1048 IQS62X_PWR_SETTINGS_PWR_MODE_NORM); 1049 if (ret) 1050 return ret; 1051 1052 return regmap_update_bits(iqs62x->regmap, IQS62X_PWR_SETTINGS, 1053 IQS62X_PWR_SETTINGS_DIS_AUTO, 0); 1054 } 1055 1056 static SIMPLE_DEV_PM_OPS(iqs62x_pm, iqs62x_suspend, iqs62x_resume); 1057 1058 static const struct of_device_id iqs62x_of_match[] = { 1059 { .compatible = "azoteq,iqs620a" }, 1060 { .compatible = "azoteq,iqs621" }, 1061 { .compatible = "azoteq,iqs622" }, 1062 { .compatible = "azoteq,iqs624" }, 1063 { .compatible = "azoteq,iqs625" }, 1064 { } 1065 }; 1066 MODULE_DEVICE_TABLE(of, iqs62x_of_match); 1067 1068 static struct i2c_driver iqs62x_i2c_driver = { 1069 .driver = { 1070 .name = "iqs62x", 1071 .of_match_table = iqs62x_of_match, 1072 .pm = &iqs62x_pm, 1073 }, 1074 .probe_new = iqs62x_probe, 1075 .remove = iqs62x_remove, 1076 }; 1077 module_i2c_driver(iqs62x_i2c_driver); 1078 1079 MODULE_AUTHOR("Jeff LaBundy <jeff@labundy.com>"); 1080 MODULE_DESCRIPTION("Azoteq IQS620A/621/622/624/625 Multi-Function Sensors"); 1081 MODULE_LICENSE("GPL"); 1082