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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * emc1403.c - SMSC Thermal Driver4 *5 * Copyright (C) 2008 Intel Corp6 *7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~8 *9 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~10 */11 12#include <linux/module.h>13#include <linux/init.h>14#include <linux/slab.h>15#include <linux/i2c.h>16#include <linux/hwmon.h>17#include <linux/hwmon-sysfs.h>18#include <linux/err.h>19#include <linux/sysfs.h>20#include <linux/mutex.h>21#include <linux/regmap.h>22#include <linux/util_macros.h>23 24#define THERMAL_PID_REG 0xfd25#define THERMAL_SMSC_ID_REG 0xfe26#define THERMAL_REVISION_REG 0xff27 28enum emc1403_chip { emc1402, emc1403, emc1404, emc1428 };29 30struct thermal_data {31 enum emc1403_chip chip;32 struct regmap *regmap;33 struct mutex mutex;34};35 36static ssize_t power_state_show(struct device *dev, struct device_attribute *attr, char *buf)37{38 struct thermal_data *data = dev_get_drvdata(dev);39 unsigned int val;40 int retval;41 42 retval = regmap_read(data->regmap, 0x03, &val);43 if (retval < 0)44 return retval;45 return sprintf(buf, "%d\n", !!(val & BIT(6)));46}47 48static ssize_t power_state_store(struct device *dev, struct device_attribute *attr,49 const char *buf, size_t count)50{51 struct thermal_data *data = dev_get_drvdata(dev);52 unsigned long val;53 int retval;54 55 if (kstrtoul(buf, 10, &val))56 return -EINVAL;57 58 retval = regmap_update_bits(data->regmap, 0x03, BIT(6),59 val ? BIT(6) : 0);60 if (retval < 0)61 return retval;62 return count;63}64 65static DEVICE_ATTR_RW(power_state);66 67static struct attribute *emc1403_attrs[] = {68 &dev_attr_power_state.attr,69 NULL70};71ATTRIBUTE_GROUPS(emc1403);72 73static int emc1403_detect(struct i2c_client *client,74 struct i2c_board_info *info)75{76 int id;77 /* Check if thermal chip is SMSC and EMC1403 or EMC1423 */78 79 id = i2c_smbus_read_byte_data(client, THERMAL_SMSC_ID_REG);80 if (id != 0x5d)81 return -ENODEV;82 83 id = i2c_smbus_read_byte_data(client, THERMAL_PID_REG);84 switch (id) {85 case 0x20:86 strscpy(info->type, "emc1402", I2C_NAME_SIZE);87 break;88 case 0x21:89 strscpy(info->type, "emc1403", I2C_NAME_SIZE);90 break;91 case 0x22:92 strscpy(info->type, "emc1422", I2C_NAME_SIZE);93 break;94 case 0x23:95 strscpy(info->type, "emc1423", I2C_NAME_SIZE);96 break;97 case 0x25:98 strscpy(info->type, "emc1404", I2C_NAME_SIZE);99 break;100 case 0x27:101 strscpy(info->type, "emc1424", I2C_NAME_SIZE);102 break;103 case 0x29:104 strscpy(info->type, "emc1428", I2C_NAME_SIZE);105 break;106 case 0x59:107 strscpy(info->type, "emc1438", I2C_NAME_SIZE);108 break;109 case 0x60:110 strscpy(info->type, "emc1442", I2C_NAME_SIZE);111 break;112 default:113 return -ENODEV;114 }115 116 id = i2c_smbus_read_byte_data(client, THERMAL_REVISION_REG);117 if (id < 0x01 || id > 0x04)118 return -ENODEV;119 120 return 0;121}122 123static bool emc1403_regmap_is_volatile(struct device *dev, unsigned int reg)124{125 switch (reg) {126 case 0x00: /* internal diode high byte */127 case 0x01: /* external diode 1 high byte */128 case 0x02: /* status */129 case 0x10: /* external diode 1 low byte */130 case 0x1b: /* external diode fault */131 case 0x23: /* external diode 2 high byte */132 case 0x24: /* external diode 2 low byte */133 case 0x29: /* internal diode low byte */134 case 0x2a: /* externl diode 3 high byte */135 case 0x2b: /* external diode 3 low byte */136 case 0x35: /* high limit status */137 case 0x36: /* low limit status */138 case 0x37: /* therm limit status */139 case 0x41: /* external diode 4 high byte */140 case 0x42: /* external diode 4 low byte */141 case 0x43: /* external diode 5 high byte */142 case 0x44: /* external diode 5 low byte */143 case 0x45: /* external diode 6 high byte */144 case 0x46: /* external diode 6 low byte */145 case 0x47: /* external diode 7 high byte */146 case 0x48: /* external diode 7 low byte */147 return true;148 default:149 return false;150 }151}152 153static const struct regmap_config emc1403_regmap_config = {154 .reg_bits = 8,155 .val_bits = 8,156 .cache_type = REGCACHE_MAPLE,157 .volatile_reg = emc1403_regmap_is_volatile,158};159 160enum emc1403_reg_map {temp_min, temp_max, temp_crit, temp_input};161 162static u8 ema1403_temp_map[] = {163 [hwmon_temp_min] = temp_min,164 [hwmon_temp_max] = temp_max,165 [hwmon_temp_crit] = temp_crit,166 [hwmon_temp_input] = temp_input,167};168 169static u8 emc1403_temp_regs[][4] = {170 [0] = {171 [temp_min] = 0x06,172 [temp_max] = 0x05,173 [temp_crit] = 0x20,174 [temp_input] = 0x00,175 },176 [1] = {177 [temp_min] = 0x08,178 [temp_max] = 0x07,179 [temp_crit] = 0x19,180 [temp_input] = 0x01,181 },182 [2] = {183 [temp_min] = 0x16,184 [temp_max] = 0x15,185 [temp_crit] = 0x1a,186 [temp_input] = 0x23,187 },188 [3] = {189 [temp_min] = 0x2d,190 [temp_max] = 0x2c,191 [temp_crit] = 0x30,192 [temp_input] = 0x2a,193 },194 [4] = {195 [temp_min] = 0x51,196 [temp_max] = 0x50,197 [temp_crit] = 0x64,198 [temp_input] = 0x41,199 },200 [5] = {201 [temp_min] = 0x55,202 [temp_max] = 0x54,203 [temp_crit] = 0x65,204 [temp_input] = 0x43205 },206 [6] = {207 [temp_min] = 0x59,208 [temp_max] = 0x58,209 [temp_crit] = 0x66,210 [temp_input] = 0x45,211 },212 [7] = {213 [temp_min] = 0x5d,214 [temp_max] = 0x5c,215 [temp_crit] = 0x67,216 [temp_input] = 0x47,217 },218};219 220static s8 emc1403_temp_regs_low[][4] = {221 [0] = {222 [temp_min] = -1,223 [temp_max] = -1,224 [temp_crit] = -1,225 [temp_input] = 0x29,226 },227 [1] = {228 [temp_min] = 0x14,229 [temp_max] = 0x13,230 [temp_crit] = -1,231 [temp_input] = 0x10,232 },233 [2] = {234 [temp_min] = 0x18,235 [temp_max] = 0x17,236 [temp_crit] = -1,237 [temp_input] = 0x24,238 },239 [3] = {240 [temp_min] = 0x2f,241 [temp_max] = 0x2e,242 [temp_crit] = -1,243 [temp_input] = 0x2b,244 },245 [4] = {246 [temp_min] = 0x53,247 [temp_max] = 0x52,248 [temp_crit] = -1,249 [temp_input] = 0x42,250 },251 [5] = {252 [temp_min] = 0x57,253 [temp_max] = 0x56,254 [temp_crit] = -1,255 [temp_input] = 0x44,256 },257 [6] = {258 [temp_min] = 0x5b,259 [temp_max] = 0x5a,260 [temp_crit] = -1,261 [temp_input] = 0x46,262 },263 [7] = {264 [temp_min] = 0x5f,265 [temp_max] = 0x5e,266 [temp_crit] = -1,267 [temp_input] = 0x48,268 },269};270 271static int __emc1403_get_temp(struct thermal_data *data, int channel,272 enum emc1403_reg_map map, long *val)273{274 unsigned int regvalh;275 unsigned int regvall = 0;276 int ret;277 s8 reg;278 279 ret = regmap_read(data->regmap, emc1403_temp_regs[channel][map], ®valh);280 if (ret < 0)281 return ret;282 283 reg = emc1403_temp_regs_low[channel][map];284 if (reg >= 0) {285 ret = regmap_read(data->regmap, reg, ®vall);286 if (ret < 0)287 return ret;288 }289 290 if (data->chip == emc1428)291 *val = sign_extend32((regvalh << 3) | (regvall >> 5), 10) * 125;292 else293 *val = ((regvalh << 3) | (regvall >> 5)) * 125;294 295 return 0;296}297 298static int emc1403_get_temp(struct thermal_data *data, int channel,299 enum emc1403_reg_map map, long *val)300{301 int ret;302 303 mutex_lock(&data->mutex);304 ret = __emc1403_get_temp(data, channel, map, val);305 mutex_unlock(&data->mutex);306 307 return ret;308}309 310static int emc1403_get_hyst(struct thermal_data *data, int channel,311 enum emc1403_reg_map map, long *val)312{313 int hyst, ret;314 long limit;315 316 mutex_lock(&data->mutex);317 ret = __emc1403_get_temp(data, channel, map, &limit);318 if (ret < 0)319 goto unlock;320 ret = regmap_read(data->regmap, 0x21, &hyst);321 if (ret < 0)322 goto unlock;323 if (map == temp_min)324 *val = limit + hyst * 1000;325 else326 *val = limit - hyst * 1000;327unlock:328 mutex_unlock(&data->mutex);329 return ret;330}331 332static int emc1403_temp_read(struct thermal_data *data, u32 attr, int channel, long *val)333{334 unsigned int regval;335 int ret;336 337 switch (attr) {338 case hwmon_temp_min:339 case hwmon_temp_max:340 case hwmon_temp_crit:341 case hwmon_temp_input:342 ret = emc1403_get_temp(data, channel, ema1403_temp_map[attr], val);343 break;344 case hwmon_temp_min_hyst:345 ret = emc1403_get_hyst(data, channel, temp_min, val);346 break;347 case hwmon_temp_max_hyst:348 ret = emc1403_get_hyst(data, channel, temp_max, val);349 break;350 case hwmon_temp_crit_hyst:351 ret = emc1403_get_hyst(data, channel, temp_crit, val);352 break;353 case hwmon_temp_min_alarm:354 if (data->chip == emc1402) {355 ret = regmap_read(data->regmap, 0x02, ®val);356 if (ret < 0)357 break;358 *val = !!(regval & BIT(5 - 2 * channel));359 } else {360 ret = regmap_read(data->regmap, 0x36, ®val);361 if (ret < 0)362 break;363 *val = !!(regval & BIT(channel));364 }365 break;366 case hwmon_temp_max_alarm:367 if (data->chip == emc1402) {368 ret = regmap_read(data->regmap, 0x02, ®val);369 if (ret < 0)370 break;371 *val = !!(regval & BIT(6 - 2 * channel));372 } else {373 ret = regmap_read(data->regmap, 0x35, ®val);374 if (ret < 0)375 break;376 *val = !!(regval & BIT(channel));377 }378 break;379 case hwmon_temp_crit_alarm:380 if (data->chip == emc1402) {381 ret = regmap_read(data->regmap, 0x02, ®val);382 if (ret < 0)383 break;384 *val = !!(regval & BIT(channel));385 } else {386 ret = regmap_read(data->regmap, 0x37, ®val);387 if (ret < 0)388 break;389 *val = !!(regval & BIT(channel));390 }391 break;392 case hwmon_temp_fault:393 ret = regmap_read(data->regmap, 0x1b, ®val);394 if (ret < 0)395 break;396 *val = !!(regval & BIT(channel));397 break;398 default:399 return -EOPNOTSUPP;400 }401 return ret;402}403 404static int emc1403_get_convrate(struct thermal_data *data, long *val)405{406 unsigned int convrate;407 int ret;408 409 ret = regmap_read(data->regmap, 0x04, &convrate);410 if (ret < 0)411 return ret;412 if (convrate > 10)413 convrate = 4;414 415 *val = 16000 >> convrate;416 return 0;417}418 419static int emc1403_chip_read(struct thermal_data *data, u32 attr, long *val)420{421 switch (attr) {422 case hwmon_chip_update_interval:423 return emc1403_get_convrate(data, val);424 default:425 return -EOPNOTSUPP;426 }427}428 429static int emc1403_read(struct device *dev, enum hwmon_sensor_types type,430 u32 attr, int channel, long *val)431{432 struct thermal_data *data = dev_get_drvdata(dev);433 434 switch (type) {435 case hwmon_temp:436 return emc1403_temp_read(data, attr, channel, val);437 case hwmon_chip:438 return emc1403_chip_read(data, attr, val);439 default:440 return -EOPNOTSUPP;441 }442}443 444static int emc1403_set_hyst(struct thermal_data *data, long val)445{446 int hyst, ret;447 long limit;448 449 if (data->chip == emc1428)450 val = clamp_val(val, -128000, 127000);451 else452 val = clamp_val(val, 0, 255000);453 454 mutex_lock(&data->mutex);455 ret = __emc1403_get_temp(data, 0, temp_crit, &limit);456 if (ret < 0)457 goto unlock;458 459 hyst = limit - val;460 if (data->chip == emc1428)461 hyst = clamp_val(DIV_ROUND_CLOSEST(hyst, 1000), 0, 127);462 else463 hyst = clamp_val(DIV_ROUND_CLOSEST(hyst, 1000), 0, 255);464 ret = regmap_write(data->regmap, 0x21, hyst);465unlock:466 mutex_unlock(&data->mutex);467 return ret;468}469 470static int emc1403_set_temp(struct thermal_data *data, int channel,471 enum emc1403_reg_map map, long val)472{473 unsigned int regval;474 int ret;475 u8 regh;476 s8 regl;477 478 regh = emc1403_temp_regs[channel][map];479 regl = emc1403_temp_regs_low[channel][map];480 481 mutex_lock(&data->mutex);482 if (regl >= 0) {483 if (data->chip == emc1428)484 val = clamp_val(val, -128000, 127875);485 else486 val = clamp_val(val, 0, 255875);487 regval = DIV_ROUND_CLOSEST(val, 125);488 ret = regmap_write(data->regmap, regh, (regval >> 3) & 0xff);489 if (ret < 0)490 goto unlock;491 ret = regmap_write(data->regmap, regl, (regval & 0x07) << 5);492 } else {493 if (data->chip == emc1428)494 val = clamp_val(val, -128000, 127000);495 else496 val = clamp_val(val, 0, 255000);497 regval = DIV_ROUND_CLOSEST(val, 1000);498 ret = regmap_write(data->regmap, regh, regval);499 }500unlock:501 mutex_unlock(&data->mutex);502 return ret;503}504 505static int emc1403_temp_write(struct thermal_data *data, u32 attr, int channel, long val)506{507 switch (attr) {508 case hwmon_temp_min:509 case hwmon_temp_max:510 case hwmon_temp_crit:511 return emc1403_set_temp(data, channel, ema1403_temp_map[attr], val);512 case hwmon_temp_crit_hyst:513 return emc1403_set_hyst(data, val);514 default:515 return -EOPNOTSUPP;516 }517}518 519/* Lookup table for temperature conversion times in msec */520static const u16 ina3221_conv_time[] = {521 16000, 8000, 4000, 2000, 1000, 500, 250, 125, 62, 31, 16522};523 524static int emc1403_set_convrate(struct thermal_data *data, unsigned int interval)525{526 int convrate;527 528 convrate = find_closest_descending(interval, ina3221_conv_time,529 ARRAY_SIZE(ina3221_conv_time));530 return regmap_write(data->regmap, 0x04, convrate);531}532 533static int emc1403_chip_write(struct thermal_data *data, u32 attr, long val)534{535 switch (attr) {536 case hwmon_chip_update_interval:537 return emc1403_set_convrate(data, clamp_val(val, 0, 100000));538 default:539 return -EOPNOTSUPP;540 }541}542 543static int emc1403_write(struct device *dev, enum hwmon_sensor_types type,544 u32 attr, int channel, long val)545{546 struct thermal_data *data = dev_get_drvdata(dev);547 548 switch (type) {549 case hwmon_temp:550 return emc1403_temp_write(data, attr, channel, val);551 case hwmon_chip:552 return emc1403_chip_write(data, attr, val);553 default:554 return -EOPNOTSUPP;555 }556}557 558static umode_t emc1403_temp_is_visible(const void *_data, u32 attr, int channel)559{560 const struct thermal_data *data = _data;561 562 if (data->chip == emc1402 && channel > 1)563 return 0;564 if (data->chip == emc1403 && channel > 2)565 return 0;566 if (data->chip != emc1428 && channel > 3)567 return 0;568 569 switch (attr) {570 case hwmon_temp_input:571 case hwmon_temp_min_alarm:572 case hwmon_temp_max_alarm:573 case hwmon_temp_crit_alarm:574 case hwmon_temp_fault:575 case hwmon_temp_min_hyst:576 case hwmon_temp_max_hyst:577 return 0444;578 case hwmon_temp_min:579 case hwmon_temp_max:580 case hwmon_temp_crit:581 return 0644;582 case hwmon_temp_crit_hyst:583 if (channel == 0)584 return 0644;585 return 0444;586 default:587 return 0;588 }589}590 591static umode_t emc1403_chip_is_visible(const void *_data, u32 attr)592{593 switch (attr) {594 case hwmon_chip_update_interval:595 return 0644;596 default:597 return 0;598 }599}600 601static umode_t emc1403_is_visible(const void *data, enum hwmon_sensor_types type,602 u32 attr, int channel)603{604 switch (type) {605 case hwmon_temp:606 return emc1403_temp_is_visible(data, attr, channel);607 case hwmon_chip:608 return emc1403_chip_is_visible(data, attr);609 default:610 return 0;611 }612}613 614static const struct hwmon_channel_info * const emc1403_info[] = {615 HWMON_CHANNEL_INFO(chip, HWMON_C_UPDATE_INTERVAL),616 HWMON_CHANNEL_INFO(temp,617 HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX |618 HWMON_T_CRIT | HWMON_T_MIN_HYST | HWMON_T_MAX_HYST |619 HWMON_T_CRIT_HYST | HWMON_T_MIN_ALARM |620 HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM,621 HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX |622 HWMON_T_CRIT | HWMON_T_MIN_HYST | HWMON_T_MAX_HYST |623 HWMON_T_CRIT_HYST | HWMON_T_MIN_ALARM |624 HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM | HWMON_T_FAULT,625 HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX |626 HWMON_T_CRIT | HWMON_T_MIN_HYST | HWMON_T_MAX_HYST |627 HWMON_T_CRIT_HYST | HWMON_T_MIN_ALARM |628 HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM | HWMON_T_FAULT,629 HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX |630 HWMON_T_CRIT | HWMON_T_MIN_HYST | HWMON_T_MAX_HYST |631 HWMON_T_CRIT_HYST | HWMON_T_MIN_ALARM |632 HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM | HWMON_T_FAULT,633 HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX |634 HWMON_T_CRIT | HWMON_T_MIN_HYST | HWMON_T_MAX_HYST |635 HWMON_T_CRIT_HYST | HWMON_T_MIN_ALARM |636 HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM | HWMON_T_FAULT,637 HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX |638 HWMON_T_CRIT | HWMON_T_MIN_HYST | HWMON_T_MAX_HYST |639 HWMON_T_CRIT_HYST | HWMON_T_MIN_ALARM |640 HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM | HWMON_T_FAULT,641 HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX |642 HWMON_T_CRIT | HWMON_T_MIN_HYST | HWMON_T_MAX_HYST |643 HWMON_T_CRIT_HYST | HWMON_T_MIN_ALARM |644 HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM | HWMON_T_FAULT,645 HWMON_T_INPUT | HWMON_T_MIN | HWMON_T_MAX |646 HWMON_T_CRIT | HWMON_T_MIN_HYST | HWMON_T_MAX_HYST |647 HWMON_T_CRIT_HYST | HWMON_T_MIN_ALARM |648 HWMON_T_MAX_ALARM | HWMON_T_CRIT_ALARM | HWMON_T_FAULT649 ),650 NULL651};652 653static const struct hwmon_ops emc1403_hwmon_ops = {654 .is_visible = emc1403_is_visible,655 .read = emc1403_read,656 .write = emc1403_write,657};658 659static const struct hwmon_chip_info emc1403_chip_info = {660 .ops = &emc1403_hwmon_ops,661 .info = emc1403_info,662};663 664/* Last digit of chip name indicates number of channels */665static const struct i2c_device_id emc1403_idtable[] = {666 { "emc1402", emc1402 },667 { "emc1403", emc1403 },668 { "emc1404", emc1404 },669 { "emc1412", emc1402 },670 { "emc1413", emc1403 },671 { "emc1414", emc1404 },672 { "emc1422", emc1402 },673 { "emc1423", emc1403 },674 { "emc1424", emc1404 },675 { "emc1428", emc1428 },676 { "emc1438", emc1428 },677 { "emc1442", emc1402 },678 { }679};680MODULE_DEVICE_TABLE(i2c, emc1403_idtable);681 682static int emc1403_probe(struct i2c_client *client)683{684 struct thermal_data *data;685 struct device *hwmon_dev;686 const struct i2c_device_id *id = i2c_match_id(emc1403_idtable, client);687 688 data = devm_kzalloc(&client->dev, sizeof(struct thermal_data),689 GFP_KERNEL);690 if (!data)691 return -ENOMEM;692 693 data->chip = id->driver_data;694 data->regmap = devm_regmap_init_i2c(client, &emc1403_regmap_config);695 if (IS_ERR(data->regmap))696 return PTR_ERR(data->regmap);697 698 mutex_init(&data->mutex);699 700 hwmon_dev = devm_hwmon_device_register_with_info(&client->dev,701 client->name, data,702 &emc1403_chip_info,703 emc1403_groups);704 return PTR_ERR_OR_ZERO(hwmon_dev);705}706 707static const unsigned short emc1403_address_list[] = {708 0x18, 0x1c, 0x29, 0x3c, 0x4c, 0x4d, 0x5c, I2C_CLIENT_END709};710 711static struct i2c_driver sensor_emc1403 = {712 .class = I2C_CLASS_HWMON,713 .driver = {714 .name = "emc1403",715 },716 .detect = emc1403_detect,717 .probe = emc1403_probe,718 .id_table = emc1403_idtable,719 .address_list = emc1403_address_list,720};721 722module_i2c_driver(sensor_emc1403);723 724MODULE_AUTHOR("Kalhan Trisal <kalhan.trisal@intel.com");725MODULE_DESCRIPTION("emc1403 Thermal Driver");726MODULE_LICENSE("GPL v2");727