1 // SPDX-License-Identifier: GPL-2.0-only
3 * emc1403.c - SMSC Thermal Driver
5 * Copyright (C) 2008 Intel Corp
7 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
9 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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>
24 #define THERMAL_PID_REG 0xfd
25 #define THERMAL_SMSC_ID_REG 0xfe
26 #define THERMAL_REVISION_REG 0xff
28 enum emc1403_chip { emc1402, emc1403, emc1404, emc1428 };
31 enum emc1403_chip chip;
32 struct regmap *regmap;
36 static ssize_t power_state_show(struct device *dev, struct device_attribute *attr, char *buf)
38 struct thermal_data *data = dev_get_drvdata(dev);
42 retval = regmap_read(data->regmap, 0x03, &val);
45 return sprintf(buf, "%d\n", !!(val & BIT(6)));
48 static ssize_t power_state_store(struct device *dev, struct device_attribute *attr,
49 const char *buf, size_t count)
51 struct thermal_data *data = dev_get_drvdata(dev);
55 if (kstrtoul(buf, 10, &val))
58 retval = regmap_update_bits(data->regmap, 0x03, BIT(6),
65 static DEVICE_ATTR_RW(power_state);
67 static struct attribute *emc1403_attrs[] = {
68 &dev_attr_power_state.attr,
71 ATTRIBUTE_GROUPS(emc1403);
73 static int emc1403_detect(struct i2c_client *client,
74 struct i2c_board_info *info)
77 /* Check if thermal chip is SMSC and EMC1403 or EMC1423 */
79 id = i2c_smbus_read_byte_data(client, THERMAL_SMSC_ID_REG);
83 id = i2c_smbus_read_byte_data(client, THERMAL_PID_REG);
86 strscpy(info->type, "emc1402", I2C_NAME_SIZE);
89 strscpy(info->type, "emc1403", I2C_NAME_SIZE);
92 strscpy(info->type, "emc1422", I2C_NAME_SIZE);
95 strscpy(info->type, "emc1423", I2C_NAME_SIZE);
98 strscpy(info->type, "emc1404", I2C_NAME_SIZE);
101 strscpy(info->type, "emc1424", I2C_NAME_SIZE);
104 strscpy(info->type, "emc1428", I2C_NAME_SIZE);
107 strscpy(info->type, "emc1438", I2C_NAME_SIZE);
110 strscpy(info->type, "emc1442", I2C_NAME_SIZE);
116 id = i2c_smbus_read_byte_data(client, THERMAL_REVISION_REG);
117 if (id < 0x01 || id > 0x04)
123 static bool emc1403_regmap_is_volatile(struct device *dev, unsigned int 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 */
153 static const struct regmap_config emc1403_regmap_config = {
156 .cache_type = REGCACHE_MAPLE,
157 .volatile_reg = emc1403_regmap_is_volatile,
160 enum emc1403_reg_map {temp_min, temp_max, temp_crit, temp_input};
162 static 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,
169 static u8 emc1403_temp_regs[][4] = {
220 static s8 emc1403_temp_regs_low[][4] = {
271 static int __emc1403_get_temp(struct thermal_data *data, int channel,
272 enum emc1403_reg_map map, long *val)
274 unsigned int regvalh;
275 unsigned int regvall = 0;
279 ret = regmap_read(data->regmap, emc1403_temp_regs[channel][map], ®valh);
283 reg = emc1403_temp_regs_low[channel][map];
285 ret = regmap_read(data->regmap, reg, ®vall);
290 if (data->chip == emc1428)
291 *val = sign_extend32((regvalh << 3) | (regvall >> 5), 10) * 125;
293 *val = ((regvalh << 3) | (regvall >> 5)) * 125;
298 static int emc1403_get_temp(struct thermal_data *data, int channel,
299 enum emc1403_reg_map map, long *val)
303 mutex_lock(&data->mutex);
304 ret = __emc1403_get_temp(data, channel, map, val);
305 mutex_unlock(&data->mutex);
310 static int emc1403_get_hyst(struct thermal_data *data, int channel,
311 enum emc1403_reg_map map, long *val)
316 mutex_lock(&data->mutex);
317 ret = __emc1403_get_temp(data, channel, map, &limit);
320 ret = regmap_read(data->regmap, 0x21, &hyst);
324 *val = limit + hyst * 1000;
326 *val = limit - hyst * 1000;
328 mutex_unlock(&data->mutex);
332 static int emc1403_temp_read(struct thermal_data *data, u32 attr, int channel, long *val)
340 case hwmon_temp_crit:
341 case hwmon_temp_input:
342 ret = emc1403_get_temp(data, channel, ema1403_temp_map[attr], val);
344 case hwmon_temp_min_hyst:
345 ret = emc1403_get_hyst(data, channel, temp_min, val);
347 case hwmon_temp_max_hyst:
348 ret = emc1403_get_hyst(data, channel, temp_max, val);
350 case hwmon_temp_crit_hyst:
351 ret = emc1403_get_hyst(data, channel, temp_crit, val);
353 case hwmon_temp_min_alarm:
354 if (data->chip == emc1402) {
355 ret = regmap_read(data->regmap, 0x02, ®val);
358 *val = !!(regval & BIT(5 - 2 * channel));
360 ret = regmap_read(data->regmap, 0x36, ®val);
363 *val = !!(regval & BIT(channel));
366 case hwmon_temp_max_alarm:
367 if (data->chip == emc1402) {
368 ret = regmap_read(data->regmap, 0x02, ®val);
371 *val = !!(regval & BIT(6 - 2 * channel));
373 ret = regmap_read(data->regmap, 0x35, ®val);
376 *val = !!(regval & BIT(channel));
379 case hwmon_temp_crit_alarm:
380 if (data->chip == emc1402) {
381 ret = regmap_read(data->regmap, 0x02, ®val);
384 *val = !!(regval & BIT(channel));
386 ret = regmap_read(data->regmap, 0x37, ®val);
389 *val = !!(regval & BIT(channel));
392 case hwmon_temp_fault:
393 ret = regmap_read(data->regmap, 0x1b, ®val);
396 *val = !!(regval & BIT(channel));
404 static int emc1403_get_convrate(struct thermal_data *data, long *val)
406 unsigned int convrate;
409 ret = regmap_read(data->regmap, 0x04, &convrate);
415 *val = 16000 >> convrate;
419 static int emc1403_chip_read(struct thermal_data *data, u32 attr, long *val)
422 case hwmon_chip_update_interval:
423 return emc1403_get_convrate(data, val);
429 static int emc1403_read(struct device *dev, enum hwmon_sensor_types type,
430 u32 attr, int channel, long *val)
432 struct thermal_data *data = dev_get_drvdata(dev);
436 return emc1403_temp_read(data, attr, channel, val);
438 return emc1403_chip_read(data, attr, val);
444 static int emc1403_set_hyst(struct thermal_data *data, long val)
449 if (data->chip == emc1428)
450 val = clamp_val(val, -128000, 127000);
452 val = clamp_val(val, 0, 255000);
454 mutex_lock(&data->mutex);
455 ret = __emc1403_get_temp(data, 0, temp_crit, &limit);
460 if (data->chip == emc1428)
461 hyst = clamp_val(DIV_ROUND_CLOSEST(hyst, 1000), 0, 127);
463 hyst = clamp_val(DIV_ROUND_CLOSEST(hyst, 1000), 0, 255);
464 ret = regmap_write(data->regmap, 0x21, hyst);
466 mutex_unlock(&data->mutex);
470 static int emc1403_set_temp(struct thermal_data *data, int channel,
471 enum emc1403_reg_map map, long val)
478 regh = emc1403_temp_regs[channel][map];
479 regl = emc1403_temp_regs_low[channel][map];
481 mutex_lock(&data->mutex);
483 if (data->chip == emc1428)
484 val = clamp_val(val, -128000, 127875);
486 val = clamp_val(val, 0, 255875);
487 regval = DIV_ROUND_CLOSEST(val, 125);
488 ret = regmap_write(data->regmap, regh, (regval >> 3) & 0xff);
491 ret = regmap_write(data->regmap, regl, (regval & 0x07) << 5);
493 if (data->chip == emc1428)
494 val = clamp_val(val, -128000, 127000);
496 val = clamp_val(val, 0, 255000);
497 regval = DIV_ROUND_CLOSEST(val, 1000);
498 ret = regmap_write(data->regmap, regh, regval);
501 mutex_unlock(&data->mutex);
505 static int emc1403_temp_write(struct thermal_data *data, u32 attr, int channel, long val)
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);
519 /* Lookup table for temperature conversion times in msec */
520 static const u16 ina3221_conv_time[] = {
521 16000, 8000, 4000, 2000, 1000, 500, 250, 125, 62, 31, 16
524 static int emc1403_set_convrate(struct thermal_data *data, unsigned int interval)
528 convrate = find_closest_descending(interval, ina3221_conv_time,
529 ARRAY_SIZE(ina3221_conv_time));
530 return regmap_write(data->regmap, 0x04, convrate);
533 static int emc1403_chip_write(struct thermal_data *data, u32 attr, long val)
536 case hwmon_chip_update_interval:
537 return emc1403_set_convrate(data, clamp_val(val, 0, 100000));
543 static int emc1403_write(struct device *dev, enum hwmon_sensor_types type,
544 u32 attr, int channel, long val)
546 struct thermal_data *data = dev_get_drvdata(dev);
550 return emc1403_temp_write(data, attr, channel, val);
552 return emc1403_chip_write(data, attr, val);
558 static umode_t emc1403_temp_is_visible(const void *_data, u32 attr, int channel)
560 const struct thermal_data *data = _data;
562 if (data->chip == emc1402 && channel > 1)
564 if (data->chip == emc1403 && channel > 2)
566 if (data->chip != emc1428 && channel > 3)
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:
580 case hwmon_temp_crit:
582 case hwmon_temp_crit_hyst:
591 static umode_t emc1403_chip_is_visible(const void *_data, u32 attr)
594 case hwmon_chip_update_interval:
601 static umode_t emc1403_is_visible(const void *data, enum hwmon_sensor_types type,
602 u32 attr, int channel)
606 return emc1403_temp_is_visible(data, attr, channel);
608 return emc1403_chip_is_visible(data, attr);
614 static 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_FAULT
653 static const struct hwmon_ops emc1403_hwmon_ops = {
654 .is_visible = emc1403_is_visible,
655 .read = emc1403_read,
656 .write = emc1403_write,
659 static const struct hwmon_chip_info emc1403_chip_info = {
660 .ops = &emc1403_hwmon_ops,
661 .info = emc1403_info,
664 /* Last digit of chip name indicates number of channels */
665 static 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 },
680 MODULE_DEVICE_TABLE(i2c, emc1403_idtable);
682 static int emc1403_probe(struct i2c_client *client)
684 struct thermal_data *data;
685 struct device *hwmon_dev;
686 const struct i2c_device_id *id = i2c_match_id(emc1403_idtable, client);
688 data = devm_kzalloc(&client->dev, sizeof(struct thermal_data),
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);
698 mutex_init(&data->mutex);
700 hwmon_dev = devm_hwmon_device_register_with_info(&client->dev,
704 return PTR_ERR_OR_ZERO(hwmon_dev);
707 static const unsigned short emc1403_address_list[] = {
708 0x18, 0x1c, 0x29, 0x3c, 0x4c, 0x4d, 0x5c, I2C_CLIENT_END
711 static struct i2c_driver sensor_emc1403 = {
712 .class = I2C_CLASS_HWMON,
716 .detect = emc1403_detect,
717 .probe = emc1403_probe,
718 .id_table = emc1403_idtable,
719 .address_list = emc1403_address_list,
722 module_i2c_driver(sensor_emc1403);
724 MODULE_AUTHOR("Kalhan Trisal <kalhan.trisal@intel.com");
725 MODULE_DESCRIPTION("emc1403 Thermal Driver");
726 MODULE_LICENSE("GPL v2");