1 // SPDX-License-Identifier: GPL-2.0-or-later 2 3 /* Driver for the Texas Instruments TMP464 SMBus temperature sensor IC. 4 * Supported models: TMP464, TMP468 5 6 * Copyright (C) 2022 Agathe Porte <agathe.porte@nokia.com> 7 * Preliminary support by: 8 * Lionel Pouliquen <lionel.lp.pouliquen@nokia.com> 9 */ 10 11 #include <linux/err.h> 12 #include <linux/hwmon.h> 13 #include <linux/i2c.h> 14 #include <linux/init.h> 15 #include <linux/module.h> 16 #include <linux/mutex.h> 17 #include <linux/of_device.h> 18 #include <linux/regmap.h> 19 #include <linux/slab.h> 20 21 /* Addresses to scan */ 22 static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4b, I2C_CLIENT_END }; 23 24 #define TMP464_NUM_CHANNELS 5 /* chan 0 is internal, 1-4 are remote */ 25 #define TMP468_NUM_CHANNELS 9 /* chan 0 is internal, 1-8 are remote */ 26 27 #define MAX_CHANNELS 9 28 29 #define TMP464_TEMP_REG(channel) (channel) 30 #define TMP464_TEMP_OFFSET_REG(channel) (0x40 + ((channel) - 1) * 8) 31 #define TMP464_N_FACTOR_REG(channel) (0x41 + ((channel) - 1) * 8) 32 33 static const u8 TMP464_THERM_LIMIT[MAX_CHANNELS] = { 34 0x39, 0x42, 0x4A, 0x52, 0x5A, 0x62, 0x6a, 0x72, 0x7a }; 35 static const u8 TMP464_THERM2_LIMIT[MAX_CHANNELS] = { 36 0x3A, 0x43, 0x4B, 0x53, 0x5B, 0x63, 0x6b, 0x73, 0x7b }; 37 38 #define TMP464_THERM_STATUS_REG 0x21 39 #define TMP464_THERM2_STATUS_REG 0x22 40 #define TMP464_REMOTE_OPEN_REG 0x23 41 #define TMP464_CONFIG_REG 0x30 42 #define TMP464_TEMP_HYST_REG 0x38 43 #define TMP464_LOCK_REG 0xc4 44 45 /* Identification */ 46 #define TMP464_MANUFACTURER_ID_REG 0xFE 47 #define TMP464_DEVICE_ID_REG 0xFF 48 49 /* Flags */ 50 #define TMP464_CONFIG_SHUTDOWN BIT(5) 51 #define TMP464_CONFIG_RANGE 0x04 52 #define TMP464_CONFIG_REG_REN(x) (BIT(7 + (x))) 53 #define TMP464_CONFIG_REG_REN_MASK GENMASK(15, 7) 54 #define TMP464_CONFIG_CONVERSION_RATE_B0 2 55 #define TMP464_CONFIG_CONVERSION_RATE_B2 4 56 #define TMP464_CONFIG_CONVERSION_RATE_MASK GENMASK(TMP464_CONFIG_CONVERSION_RATE_B2, \ 57 TMP464_CONFIG_CONVERSION_RATE_B0) 58 59 #define TMP464_UNLOCK_VAL 0xeb19 60 #define TMP464_LOCK_VAL 0x5ca6 61 #define TMP464_LOCKED 0x8000 62 63 /* Manufacturer / Device ID's */ 64 #define TMP464_MANUFACTURER_ID 0x5449 65 #define TMP464_DEVICE_ID 0x1468 66 #define TMP468_DEVICE_ID 0x0468 67 68 static const struct i2c_device_id tmp464_id[] = { 69 { "tmp464", TMP464_NUM_CHANNELS }, 70 { "tmp468", TMP468_NUM_CHANNELS }, 71 { } 72 }; 73 MODULE_DEVICE_TABLE(i2c, tmp464_id); 74 75 static const struct of_device_id __maybe_unused tmp464_of_match[] = { 76 { 77 .compatible = "ti,tmp464", 78 .data = (void *)TMP464_NUM_CHANNELS 79 }, 80 { 81 .compatible = "ti,tmp468", 82 .data = (void *)TMP468_NUM_CHANNELS 83 }, 84 {}, 85 }; 86 MODULE_DEVICE_TABLE(of, tmp464_of_match); 87 88 struct tmp464_channel { 89 const char *label; 90 bool enabled; 91 }; 92 93 struct tmp464_data { 94 struct regmap *regmap; 95 struct mutex update_lock; 96 int channels; 97 s16 config_orig; 98 u16 open_reg; 99 unsigned long last_updated; 100 bool valid; 101 int update_interval; 102 struct tmp464_channel channel[MAX_CHANNELS]; 103 }; 104 105 static int temp_from_reg(s16 reg) 106 { 107 return DIV_ROUND_CLOSEST((reg >> 3) * 625, 10); 108 } 109 110 static s16 temp_to_limit_reg(long temp) 111 { 112 return DIV_ROUND_CLOSEST(temp, 500) << 6; 113 } 114 115 static s16 temp_to_offset_reg(long temp) 116 { 117 return DIV_ROUND_CLOSEST(temp * 10, 625) << 3; 118 } 119 120 static int tmp464_enable_channels(struct tmp464_data *data) 121 { 122 struct regmap *regmap = data->regmap; 123 u16 enable = 0; 124 int i; 125 126 for (i = 0; i < data->channels; i++) 127 if (data->channel[i].enabled) 128 enable |= TMP464_CONFIG_REG_REN(i); 129 130 return regmap_update_bits(regmap, TMP464_CONFIG_REG, TMP464_CONFIG_REG_REN_MASK, enable); 131 } 132 133 static int tmp464_chip_read(struct device *dev, u32 attr, int channel, long *val) 134 { 135 struct tmp464_data *data = dev_get_drvdata(dev); 136 137 switch (attr) { 138 case hwmon_chip_update_interval: 139 *val = data->update_interval; 140 return 0; 141 default: 142 return -EOPNOTSUPP; 143 } 144 } 145 146 static int tmp464_temp_read(struct device *dev, u32 attr, int channel, long *val) 147 { 148 struct tmp464_data *data = dev_get_drvdata(dev); 149 struct regmap *regmap = data->regmap; 150 unsigned int regval, regval2; 151 int err = 0; 152 153 mutex_lock(&data->update_lock); 154 155 switch (attr) { 156 case hwmon_temp_max_alarm: 157 err = regmap_read(regmap, TMP464_THERM_STATUS_REG, ®val); 158 if (err < 0) 159 break; 160 *val = !!(regval & BIT(channel + 7)); 161 break; 162 case hwmon_temp_crit_alarm: 163 err = regmap_read(regmap, TMP464_THERM2_STATUS_REG, ®val); 164 if (err < 0) 165 break; 166 *val = !!(regval & BIT(channel + 7)); 167 break; 168 case hwmon_temp_fault: 169 /* 170 * The chip clears TMP464_REMOTE_OPEN_REG after it is read 171 * and only updates it after the next measurement cycle is 172 * complete. That means we have to cache the value internally 173 * for one measurement cycle and report the cached value. 174 */ 175 if (!data->valid || time_after(jiffies, data->last_updated + 176 msecs_to_jiffies(data->update_interval))) { 177 err = regmap_read(regmap, TMP464_REMOTE_OPEN_REG, ®val); 178 if (err < 0) 179 break; 180 data->open_reg = regval; 181 data->last_updated = jiffies; 182 data->valid = true; 183 } 184 *val = !!(data->open_reg & BIT(channel + 7)); 185 break; 186 case hwmon_temp_max_hyst: 187 err = regmap_read(regmap, TMP464_THERM_LIMIT[channel], ®val); 188 if (err < 0) 189 break; 190 err = regmap_read(regmap, TMP464_TEMP_HYST_REG, ®val2); 191 if (err < 0) 192 break; 193 regval -= regval2; 194 *val = temp_from_reg(regval); 195 break; 196 case hwmon_temp_max: 197 err = regmap_read(regmap, TMP464_THERM_LIMIT[channel], ®val); 198 if (err < 0) 199 break; 200 *val = temp_from_reg(regval); 201 break; 202 case hwmon_temp_crit_hyst: 203 err = regmap_read(regmap, TMP464_THERM2_LIMIT[channel], ®val); 204 if (err < 0) 205 break; 206 err = regmap_read(regmap, TMP464_TEMP_HYST_REG, ®val2); 207 if (err < 0) 208 break; 209 regval -= regval2; 210 *val = temp_from_reg(regval); 211 break; 212 case hwmon_temp_crit: 213 err = regmap_read(regmap, TMP464_THERM2_LIMIT[channel], ®val); 214 if (err < 0) 215 break; 216 *val = temp_from_reg(regval); 217 break; 218 case hwmon_temp_offset: 219 err = regmap_read(regmap, TMP464_TEMP_OFFSET_REG(channel), ®val); 220 if (err < 0) 221 break; 222 *val = temp_from_reg(regval); 223 break; 224 case hwmon_temp_input: 225 if (!data->channel[channel].enabled) { 226 err = -ENODATA; 227 break; 228 } 229 err = regmap_read(regmap, TMP464_TEMP_REG(channel), ®val); 230 if (err < 0) 231 break; 232 *val = temp_from_reg(regval); 233 break; 234 case hwmon_temp_enable: 235 *val = data->channel[channel].enabled; 236 break; 237 default: 238 err = -EOPNOTSUPP; 239 break; 240 } 241 242 mutex_unlock(&data->update_lock); 243 244 return err; 245 } 246 247 static int tmp464_read(struct device *dev, enum hwmon_sensor_types type, 248 u32 attr, int channel, long *val) 249 { 250 switch (type) { 251 case hwmon_chip: 252 return tmp464_chip_read(dev, attr, channel, val); 253 case hwmon_temp: 254 return tmp464_temp_read(dev, attr, channel, val); 255 default: 256 return -EOPNOTSUPP; 257 } 258 } 259 260 static int tmp464_read_string(struct device *dev, enum hwmon_sensor_types type, 261 u32 attr, int channel, const char **str) 262 { 263 struct tmp464_data *data = dev_get_drvdata(dev); 264 265 *str = data->channel[channel].label; 266 267 return 0; 268 } 269 270 static int tmp464_set_convrate(struct tmp464_data *data, long interval) 271 { 272 int rate; 273 274 /* 275 * For valid rates, interval in milli-seconds can be calculated as 276 * interval = 125 << (7 - rate); 277 * or 278 * interval = (1 << (7 - rate)) * 125; 279 * The rate is therefore 280 * rate = 7 - __fls(interval / 125); 281 * and the rounded rate is 282 * rate = 7 - __fls(interval * 4 / (125 * 3)); 283 * Use clamp_val() to avoid overflows, and to ensure valid input 284 * for __fls. 285 */ 286 interval = clamp_val(interval, 125, 16000); 287 rate = 7 - __fls(interval * 4 / (125 * 3)); 288 data->update_interval = 125 << (7 - rate); 289 290 return regmap_update_bits(data->regmap, TMP464_CONFIG_REG, 291 TMP464_CONFIG_CONVERSION_RATE_MASK, 292 rate << TMP464_CONFIG_CONVERSION_RATE_B0); 293 } 294 295 static int tmp464_chip_write(struct tmp464_data *data, u32 attr, int channel, long val) 296 { 297 switch (attr) { 298 case hwmon_chip_update_interval: 299 return tmp464_set_convrate(data, val); 300 default: 301 return -EOPNOTSUPP; 302 } 303 } 304 305 static int tmp464_temp_write(struct tmp464_data *data, u32 attr, int channel, long val) 306 { 307 struct regmap *regmap = data->regmap; 308 unsigned int regval; 309 int err = 0; 310 311 switch (attr) { 312 case hwmon_temp_max_hyst: 313 err = regmap_read(regmap, TMP464_THERM_LIMIT[0], ®val); 314 if (err < 0) 315 break; 316 val = clamp_val(val, -256000, 256000); /* prevent overflow/underflow */ 317 val = clamp_val(temp_from_reg(regval) - val, 0, 255000); 318 err = regmap_write(regmap, TMP464_TEMP_HYST_REG, 319 DIV_ROUND_CLOSEST(val, 1000) << 7); 320 break; 321 case hwmon_temp_max: 322 val = temp_to_limit_reg(clamp_val(val, -255000, 255500)); 323 err = regmap_write(regmap, TMP464_THERM_LIMIT[channel], val); 324 break; 325 case hwmon_temp_crit: 326 val = temp_to_limit_reg(clamp_val(val, -255000, 255500)); 327 err = regmap_write(regmap, TMP464_THERM2_LIMIT[channel], val); 328 break; 329 case hwmon_temp_offset: 330 val = temp_to_offset_reg(clamp_val(val, -128000, 127937)); 331 err = regmap_write(regmap, TMP464_TEMP_OFFSET_REG(channel), val); 332 break; 333 case hwmon_temp_enable: 334 data->channel[channel].enabled = !!val; 335 err = tmp464_enable_channels(data); 336 break; 337 default: 338 err = -EOPNOTSUPP; 339 break; 340 } 341 342 return err; 343 } 344 345 static int tmp464_write(struct device *dev, enum hwmon_sensor_types type, 346 u32 attr, int channel, long val) 347 { 348 struct tmp464_data *data = dev_get_drvdata(dev); 349 int err; 350 351 mutex_lock(&data->update_lock); 352 353 switch (type) { 354 case hwmon_chip: 355 err = tmp464_chip_write(data, attr, channel, val); 356 break; 357 case hwmon_temp: 358 err = tmp464_temp_write(data, attr, channel, val); 359 break; 360 default: 361 err = -EOPNOTSUPP; 362 break; 363 } 364 365 mutex_unlock(&data->update_lock); 366 367 return err; 368 } 369 370 static umode_t tmp464_is_visible(const void *_data, enum hwmon_sensor_types type, 371 u32 attr, int channel) 372 { 373 const struct tmp464_data *data = _data; 374 375 if (channel >= data->channels) 376 return 0; 377 378 if (type == hwmon_chip) { 379 if (attr == hwmon_chip_update_interval) 380 return 0644; 381 return 0; 382 } 383 384 switch (attr) { 385 case hwmon_temp_input: 386 case hwmon_temp_max_alarm: 387 case hwmon_temp_crit_alarm: 388 case hwmon_temp_crit_hyst: 389 return 0444; 390 case hwmon_temp_enable: 391 case hwmon_temp_max: 392 case hwmon_temp_crit: 393 return 0644; 394 case hwmon_temp_max_hyst: 395 if (!channel) 396 return 0644; 397 return 0444; 398 case hwmon_temp_label: 399 if (data->channel[channel].label) 400 return 0444; 401 return 0; 402 case hwmon_temp_fault: 403 if (channel) 404 return 0444; 405 return 0; 406 case hwmon_temp_offset: 407 if (channel) 408 return 0644; 409 return 0; 410 default: 411 return 0; 412 } 413 } 414 415 static void tmp464_restore_lock(void *regmap) 416 { 417 regmap_write(regmap, TMP464_LOCK_REG, TMP464_LOCK_VAL); 418 } 419 420 static void tmp464_restore_config(void *_data) 421 { 422 struct tmp464_data *data = _data; 423 424 regmap_write(data->regmap, TMP464_CONFIG_REG, data->config_orig); 425 } 426 427 static int tmp464_init_client(struct device *dev, struct tmp464_data *data) 428 { 429 struct regmap *regmap = data->regmap; 430 unsigned int regval; 431 int err; 432 433 err = regmap_read(regmap, TMP464_LOCK_REG, ®val); 434 if (err) 435 return err; 436 if (regval == TMP464_LOCKED) { 437 /* Explicitly unlock chip if it is locked */ 438 err = regmap_write(regmap, TMP464_LOCK_REG, TMP464_UNLOCK_VAL); 439 if (err) 440 return err; 441 /* and lock it again when unloading the driver */ 442 err = devm_add_action_or_reset(dev, tmp464_restore_lock, regmap); 443 if (err) 444 return err; 445 } 446 447 err = regmap_read(regmap, TMP464_CONFIG_REG, ®val); 448 if (err) 449 return err; 450 data->config_orig = regval; 451 err = devm_add_action_or_reset(dev, tmp464_restore_config, data); 452 if (err) 453 return err; 454 455 /* Default to 500 ms update interval */ 456 err = regmap_update_bits(regmap, TMP464_CONFIG_REG, 457 TMP464_CONFIG_CONVERSION_RATE_MASK | TMP464_CONFIG_SHUTDOWN, 458 BIT(TMP464_CONFIG_CONVERSION_RATE_B0) | 459 BIT(TMP464_CONFIG_CONVERSION_RATE_B2)); 460 if (err) 461 return err; 462 463 data->update_interval = 500; 464 465 return tmp464_enable_channels(data); 466 } 467 468 static int tmp464_detect(struct i2c_client *client, 469 struct i2c_board_info *info) 470 { 471 struct i2c_adapter *adapter = client->adapter; 472 char *name, *chip; 473 int reg; 474 475 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_WORD_DATA)) 476 return -ENODEV; 477 478 reg = i2c_smbus_read_word_swapped(client, TMP464_MANUFACTURER_ID_REG); 479 if (reg < 0) 480 return reg; 481 if (reg != TMP464_MANUFACTURER_ID) 482 return -ENODEV; 483 484 /* Check for "always return zero" bits */ 485 reg = i2c_smbus_read_word_swapped(client, TMP464_THERM_STATUS_REG); 486 if (reg < 0) 487 return reg; 488 if (reg & 0x1f) 489 return -ENODEV; 490 reg = i2c_smbus_read_word_swapped(client, TMP464_THERM2_STATUS_REG); 491 if (reg < 0) 492 return reg; 493 if (reg & 0x1f) 494 return -ENODEV; 495 496 reg = i2c_smbus_read_word_swapped(client, TMP464_DEVICE_ID_REG); 497 if (reg < 0) 498 return reg; 499 switch (reg) { 500 case TMP464_DEVICE_ID: 501 name = "tmp464"; 502 chip = "TMP464"; 503 break; 504 case TMP468_DEVICE_ID: 505 name = "tmp468"; 506 chip = "TMP468"; 507 break; 508 default: 509 return -ENODEV; 510 } 511 512 strscpy(info->type, name, I2C_NAME_SIZE); 513 dev_info(&adapter->dev, "Detected TI %s chip at 0x%02x\n", chip, client->addr); 514 515 return 0; 516 } 517 518 static int tmp464_probe_child_from_dt(struct device *dev, 519 struct device_node *child, 520 struct tmp464_data *data) 521 522 { 523 struct regmap *regmap = data->regmap; 524 u32 channel; 525 s32 nfactor; 526 int err; 527 528 err = of_property_read_u32(child, "reg", &channel); 529 if (err) { 530 dev_err(dev, "missing reg property of %pOFn\n", child); 531 return err; 532 } 533 534 if (channel >= data->channels) { 535 dev_err(dev, "invalid reg %d of %pOFn\n", channel, child); 536 return -EINVAL; 537 } 538 539 of_property_read_string(child, "label", &data->channel[channel].label); 540 541 data->channel[channel].enabled = of_device_is_available(child); 542 543 err = of_property_read_s32(child, "ti,n-factor", &nfactor); 544 if (err && err != -EINVAL) 545 return err; 546 if (!err) { 547 if (channel == 0) { 548 dev_err(dev, "n-factor can't be set for internal channel\n"); 549 return -EINVAL; 550 } 551 if (nfactor > 127 || nfactor < -128) { 552 dev_err(dev, "n-factor for channel %d invalid (%d)\n", 553 channel, nfactor); 554 return -EINVAL; 555 } 556 err = regmap_write(regmap, TMP464_N_FACTOR_REG(channel), 557 (nfactor << 8) & 0xff00); 558 if (err) 559 return err; 560 } 561 562 return 0; 563 } 564 565 static int tmp464_probe_from_dt(struct device *dev, struct tmp464_data *data) 566 { 567 const struct device_node *np = dev->of_node; 568 struct device_node *child; 569 int err; 570 571 for_each_child_of_node(np, child) { 572 if (strcmp(child->name, "channel")) 573 continue; 574 575 err = tmp464_probe_child_from_dt(dev, child, data); 576 if (err) { 577 of_node_put(child); 578 return err; 579 } 580 } 581 582 return 0; 583 } 584 585 static const struct hwmon_ops tmp464_ops = { 586 .is_visible = tmp464_is_visible, 587 .read = tmp464_read, 588 .read_string = tmp464_read_string, 589 .write = tmp464_write, 590 }; 591 592 static const struct hwmon_channel_info * const tmp464_info[] = { 593 HWMON_CHANNEL_INFO(chip, 594 HWMON_C_UPDATE_INTERVAL), 595 HWMON_CHANNEL_INFO(temp, 596 HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MAX_HYST | HWMON_T_CRIT | 597 HWMON_T_CRIT_HYST | HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM | 598 HWMON_T_LABEL | HWMON_T_ENABLE, 599 HWMON_T_INPUT | HWMON_T_OFFSET | HWMON_T_MAX | HWMON_T_MAX_HYST | 600 HWMON_T_CRIT | HWMON_T_CRIT_HYST | HWMON_T_MAX_ALARM | 601 HWMON_T_CRIT_ALARM | HWMON_T_FAULT | HWMON_T_LABEL | HWMON_T_ENABLE, 602 HWMON_T_INPUT | HWMON_T_OFFSET | HWMON_T_MAX | HWMON_T_MAX_HYST | 603 HWMON_T_CRIT | HWMON_T_CRIT_HYST | HWMON_T_MAX_ALARM | 604 HWMON_T_CRIT_ALARM | HWMON_T_FAULT | HWMON_T_LABEL | HWMON_T_ENABLE, 605 HWMON_T_INPUT | HWMON_T_OFFSET | HWMON_T_MAX | HWMON_T_MAX_HYST | 606 HWMON_T_CRIT | HWMON_T_CRIT_HYST | HWMON_T_MAX_ALARM | 607 HWMON_T_CRIT_ALARM | HWMON_T_FAULT | HWMON_T_LABEL | HWMON_T_ENABLE, 608 HWMON_T_INPUT | HWMON_T_OFFSET | HWMON_T_MAX | HWMON_T_MAX_HYST | 609 HWMON_T_CRIT | HWMON_T_CRIT_HYST | HWMON_T_MAX_ALARM | 610 HWMON_T_CRIT_ALARM | HWMON_T_FAULT | HWMON_T_LABEL | HWMON_T_ENABLE, 611 HWMON_T_INPUT | HWMON_T_OFFSET | HWMON_T_MAX | HWMON_T_MAX_HYST | 612 HWMON_T_CRIT | HWMON_T_CRIT_HYST | HWMON_T_MAX_ALARM | 613 HWMON_T_CRIT_ALARM | HWMON_T_FAULT | HWMON_T_LABEL | HWMON_T_ENABLE, 614 HWMON_T_INPUT | HWMON_T_OFFSET | HWMON_T_MAX | HWMON_T_MAX_HYST | 615 HWMON_T_CRIT | HWMON_T_CRIT_HYST | HWMON_T_MAX_ALARM | 616 HWMON_T_CRIT_ALARM | HWMON_T_FAULT | HWMON_T_LABEL | HWMON_T_ENABLE, 617 HWMON_T_INPUT | HWMON_T_OFFSET | HWMON_T_MAX | HWMON_T_MAX_HYST | 618 HWMON_T_CRIT | HWMON_T_CRIT_HYST | HWMON_T_MAX_ALARM | 619 HWMON_T_CRIT_ALARM | HWMON_T_FAULT | HWMON_T_LABEL | HWMON_T_ENABLE, 620 HWMON_T_INPUT | HWMON_T_OFFSET | HWMON_T_MAX | HWMON_T_MAX_HYST | 621 HWMON_T_CRIT | HWMON_T_CRIT_HYST | HWMON_T_MAX_ALARM | 622 HWMON_T_CRIT_ALARM | HWMON_T_FAULT | HWMON_T_LABEL | HWMON_T_ENABLE), 623 NULL 624 }; 625 626 static const struct hwmon_chip_info tmp464_chip_info = { 627 .ops = &tmp464_ops, 628 .info = tmp464_info, 629 }; 630 631 /* regmap */ 632 633 static bool tmp464_is_volatile_reg(struct device *dev, unsigned int reg) 634 { 635 return (reg < TMP464_TEMP_REG(TMP468_NUM_CHANNELS) || 636 reg == TMP464_THERM_STATUS_REG || 637 reg == TMP464_THERM2_STATUS_REG || 638 reg == TMP464_REMOTE_OPEN_REG); 639 } 640 641 static const struct regmap_config tmp464_regmap_config = { 642 .reg_bits = 8, 643 .val_bits = 16, 644 .max_register = TMP464_DEVICE_ID_REG, 645 .volatile_reg = tmp464_is_volatile_reg, 646 .val_format_endian = REGMAP_ENDIAN_BIG, 647 .cache_type = REGCACHE_MAPLE, 648 .use_single_read = true, 649 .use_single_write = true, 650 }; 651 652 static int tmp464_probe(struct i2c_client *client) 653 { 654 struct device *dev = &client->dev; 655 struct device *hwmon_dev; 656 struct tmp464_data *data; 657 int i, err; 658 659 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WORD_DATA)) { 660 dev_err(&client->dev, "i2c functionality check failed\n"); 661 return -ENODEV; 662 } 663 data = devm_kzalloc(dev, sizeof(struct tmp464_data), GFP_KERNEL); 664 if (!data) 665 return -ENOMEM; 666 667 mutex_init(&data->update_lock); 668 669 if (dev->of_node) 670 data->channels = (int)(unsigned long)of_device_get_match_data(&client->dev); 671 else 672 data->channels = i2c_match_id(tmp464_id, client)->driver_data; 673 674 data->regmap = devm_regmap_init_i2c(client, &tmp464_regmap_config); 675 if (IS_ERR(data->regmap)) 676 return PTR_ERR(data->regmap); 677 678 for (i = 0; i < data->channels; i++) 679 data->channel[i].enabled = true; 680 681 err = tmp464_init_client(dev, data); 682 if (err) 683 return err; 684 685 if (dev->of_node) { 686 err = tmp464_probe_from_dt(dev, data); 687 if (err) 688 return err; 689 } 690 691 hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, 692 data, &tmp464_chip_info, NULL); 693 return PTR_ERR_OR_ZERO(hwmon_dev); 694 } 695 696 static struct i2c_driver tmp464_driver = { 697 .class = I2C_CLASS_HWMON, 698 .driver = { 699 .name = "tmp464", 700 .of_match_table = of_match_ptr(tmp464_of_match), 701 }, 702 .probe = tmp464_probe, 703 .id_table = tmp464_id, 704 .detect = tmp464_detect, 705 .address_list = normal_i2c, 706 }; 707 708 module_i2c_driver(tmp464_driver); 709 710 MODULE_AUTHOR("Agathe Porte <agathe.porte@nokia.com>"); 711 MODULE_DESCRIPTION("Texas Instruments TMP464 temperature sensor driver"); 712 MODULE_LICENSE("GPL"); 713