1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Hardware monitoring driver for PMBus devices
5 * Copyright (c) 2010, 2011 Ericsson AB.
6 * Copyright (c) 2012 Guenter Roeck
9 #include <linux/debugfs.h>
10 #include <linux/kernel.h>
11 #include <linux/math64.h>
12 #include <linux/module.h>
13 #include <linux/init.h>
14 #include <linux/err.h>
15 #include <linux/slab.h>
16 #include <linux/i2c.h>
17 #include <linux/hwmon.h>
18 #include <linux/hwmon-sysfs.h>
19 #include <linux/jiffies.h>
20 #include <linux/pmbus.h>
21 #include <linux/regulator/driver.h>
22 #include <linux/regulator/machine.h>
26 * Number of additional attribute pointers to allocate
27 * with each call to krealloc
29 #define PMBUS_ATTR_ALLOC_SIZE 32
32 * Index into status register array, per status register group
34 #define PB_STATUS_BASE 0
35 #define PB_STATUS_VOUT_BASE (PB_STATUS_BASE + PMBUS_PAGES)
36 #define PB_STATUS_IOUT_BASE (PB_STATUS_VOUT_BASE + PMBUS_PAGES)
37 #define PB_STATUS_FAN_BASE (PB_STATUS_IOUT_BASE + PMBUS_PAGES)
38 #define PB_STATUS_FAN34_BASE (PB_STATUS_FAN_BASE + PMBUS_PAGES)
39 #define PB_STATUS_TEMP_BASE (PB_STATUS_FAN34_BASE + PMBUS_PAGES)
40 #define PB_STATUS_INPUT_BASE (PB_STATUS_TEMP_BASE + PMBUS_PAGES)
41 #define PB_STATUS_VMON_BASE (PB_STATUS_INPUT_BASE + 1)
43 #define PB_NUM_STATUS_REG (PB_STATUS_VMON_BASE + 1)
45 #define PMBUS_NAME_SIZE 24
48 struct pmbus_sensor *next;
49 char name[PMBUS_NAME_SIZE]; /* sysfs sensor name */
50 struct device_attribute attribute;
51 u8 page; /* page number */
52 u16 reg; /* register */
53 enum pmbus_sensor_classes class; /* sensor class */
54 bool update; /* runtime sensor update needed */
55 bool convert; /* Whether or not to apply linear/vid/direct */
56 int data; /* Sensor data.
57 Negative if there was a read error */
59 #define to_pmbus_sensor(_attr) \
60 container_of(_attr, struct pmbus_sensor, attribute)
62 struct pmbus_boolean {
63 char name[PMBUS_NAME_SIZE]; /* sysfs boolean name */
64 struct sensor_device_attribute attribute;
65 struct pmbus_sensor *s1;
66 struct pmbus_sensor *s2;
68 #define to_pmbus_boolean(_attr) \
69 container_of(_attr, struct pmbus_boolean, attribute)
72 char name[PMBUS_NAME_SIZE]; /* sysfs label name */
73 struct device_attribute attribute;
74 char label[PMBUS_NAME_SIZE]; /* label */
76 #define to_pmbus_label(_attr) \
77 container_of(_attr, struct pmbus_label, attribute)
81 struct device *hwmon_dev;
83 u32 flags; /* from platform data */
85 int exponent[PMBUS_PAGES];
86 /* linear mode: exponent for output voltages */
88 const struct pmbus_driver_info *info;
92 struct attribute_group group;
93 const struct attribute_group **groups;
94 struct dentry *debugfs; /* debugfs device directory */
96 struct pmbus_sensor *sensors;
98 struct mutex update_lock;
100 unsigned long last_updated; /* in jiffies */
103 * A single status register covers multiple attributes,
104 * so we keep them all together.
106 u16 status[PB_NUM_STATUS_REG];
108 bool has_status_word; /* device uses STATUS_WORD register */
109 int (*read_status)(struct i2c_client *client, int page);
114 struct pmbus_debugfs_entry {
115 struct i2c_client *client;
120 static const int pmbus_fan_rpm_mask[] = {
127 static const int pmbus_fan_config_registers[] = {
134 static const int pmbus_fan_command_registers[] = {
141 void pmbus_clear_cache(struct i2c_client *client)
143 struct pmbus_data *data = i2c_get_clientdata(client);
147 EXPORT_SYMBOL_GPL(pmbus_clear_cache);
149 int pmbus_set_page(struct i2c_client *client, int page)
151 struct pmbus_data *data = i2c_get_clientdata(client);
154 if (page < 0 || page == data->currpage)
157 if (!(data->info->func[page] & PMBUS_PAGE_VIRTUAL)) {
158 rv = i2c_smbus_write_byte_data(client, PMBUS_PAGE, page);
162 rv = i2c_smbus_read_byte_data(client, PMBUS_PAGE);
170 data->currpage = page;
174 EXPORT_SYMBOL_GPL(pmbus_set_page);
176 int pmbus_write_byte(struct i2c_client *client, int page, u8 value)
180 rv = pmbus_set_page(client, page);
184 return i2c_smbus_write_byte(client, value);
186 EXPORT_SYMBOL_GPL(pmbus_write_byte);
189 * _pmbus_write_byte() is similar to pmbus_write_byte(), but checks if
190 * a device specific mapping function exists and calls it if necessary.
192 static int _pmbus_write_byte(struct i2c_client *client, int page, u8 value)
194 struct pmbus_data *data = i2c_get_clientdata(client);
195 const struct pmbus_driver_info *info = data->info;
198 if (info->write_byte) {
199 status = info->write_byte(client, page, value);
200 if (status != -ENODATA)
203 return pmbus_write_byte(client, page, value);
206 int pmbus_write_word_data(struct i2c_client *client, int page, u8 reg,
211 rv = pmbus_set_page(client, page);
215 return i2c_smbus_write_word_data(client, reg, word);
217 EXPORT_SYMBOL_GPL(pmbus_write_word_data);
220 static int pmbus_write_virt_reg(struct i2c_client *client, int page, int reg,
228 case PMBUS_VIRT_FAN_TARGET_1 ... PMBUS_VIRT_FAN_TARGET_4:
229 id = reg - PMBUS_VIRT_FAN_TARGET_1;
230 bit = pmbus_fan_rpm_mask[id];
231 rv = pmbus_update_fan(client, page, id, bit, bit, word);
242 * _pmbus_write_word_data() is similar to pmbus_write_word_data(), but checks if
243 * a device specific mapping function exists and calls it if necessary.
245 static int _pmbus_write_word_data(struct i2c_client *client, int page, int reg,
248 struct pmbus_data *data = i2c_get_clientdata(client);
249 const struct pmbus_driver_info *info = data->info;
252 if (info->write_word_data) {
253 status = info->write_word_data(client, page, reg, word);
254 if (status != -ENODATA)
258 if (reg >= PMBUS_VIRT_BASE)
259 return pmbus_write_virt_reg(client, page, reg, word);
261 return pmbus_write_word_data(client, page, reg, word);
264 int pmbus_update_fan(struct i2c_client *client, int page, int id,
265 u8 config, u8 mask, u16 command)
271 from = pmbus_read_byte_data(client, page,
272 pmbus_fan_config_registers[id]);
276 to = (from & ~mask) | (config & mask);
278 rv = pmbus_write_byte_data(client, page,
279 pmbus_fan_config_registers[id], to);
284 return _pmbus_write_word_data(client, page,
285 pmbus_fan_command_registers[id], command);
287 EXPORT_SYMBOL_GPL(pmbus_update_fan);
289 int pmbus_read_word_data(struct i2c_client *client, int page, u8 reg)
293 rv = pmbus_set_page(client, page);
297 return i2c_smbus_read_word_data(client, reg);
299 EXPORT_SYMBOL_GPL(pmbus_read_word_data);
301 static int pmbus_read_virt_reg(struct i2c_client *client, int page, int reg)
307 case PMBUS_VIRT_FAN_TARGET_1 ... PMBUS_VIRT_FAN_TARGET_4:
308 id = reg - PMBUS_VIRT_FAN_TARGET_1;
309 rv = pmbus_get_fan_rate_device(client, page, id, rpm);
320 * _pmbus_read_word_data() is similar to pmbus_read_word_data(), but checks if
321 * a device specific mapping function exists and calls it if necessary.
323 static int _pmbus_read_word_data(struct i2c_client *client, int page, int reg)
325 struct pmbus_data *data = i2c_get_clientdata(client);
326 const struct pmbus_driver_info *info = data->info;
329 if (info->read_word_data) {
330 status = info->read_word_data(client, page, reg);
331 if (status != -ENODATA)
335 if (reg >= PMBUS_VIRT_BASE)
336 return pmbus_read_virt_reg(client, page, reg);
338 return pmbus_read_word_data(client, page, reg);
341 int pmbus_read_byte_data(struct i2c_client *client, int page, u8 reg)
345 rv = pmbus_set_page(client, page);
349 return i2c_smbus_read_byte_data(client, reg);
351 EXPORT_SYMBOL_GPL(pmbus_read_byte_data);
353 int pmbus_write_byte_data(struct i2c_client *client, int page, u8 reg, u8 value)
357 rv = pmbus_set_page(client, page);
361 return i2c_smbus_write_byte_data(client, reg, value);
363 EXPORT_SYMBOL_GPL(pmbus_write_byte_data);
365 int pmbus_update_byte_data(struct i2c_client *client, int page, u8 reg,
371 rv = pmbus_read_byte_data(client, page, reg);
375 tmp = (rv & ~mask) | (value & mask);
378 rv = pmbus_write_byte_data(client, page, reg, tmp);
382 EXPORT_SYMBOL_GPL(pmbus_update_byte_data);
385 * _pmbus_read_byte_data() is similar to pmbus_read_byte_data(), but checks if
386 * a device specific mapping function exists and calls it if necessary.
388 static int _pmbus_read_byte_data(struct i2c_client *client, int page, int reg)
390 struct pmbus_data *data = i2c_get_clientdata(client);
391 const struct pmbus_driver_info *info = data->info;
394 if (info->read_byte_data) {
395 status = info->read_byte_data(client, page, reg);
396 if (status != -ENODATA)
399 return pmbus_read_byte_data(client, page, reg);
402 static struct pmbus_sensor *pmbus_find_sensor(struct pmbus_data *data, int page,
405 struct pmbus_sensor *sensor;
407 for (sensor = data->sensors; sensor; sensor = sensor->next) {
408 if (sensor->page == page && sensor->reg == reg)
412 return ERR_PTR(-EINVAL);
415 static int pmbus_get_fan_rate(struct i2c_client *client, int page, int id,
416 enum pmbus_fan_mode mode,
419 struct pmbus_data *data = i2c_get_clientdata(client);
420 bool want_rpm, have_rpm;
421 struct pmbus_sensor *s;
425 want_rpm = (mode == rpm);
428 reg = want_rpm ? PMBUS_VIRT_FAN_TARGET_1 : PMBUS_VIRT_PWM_1;
429 s = pmbus_find_sensor(data, page, reg + id);
436 config = pmbus_read_byte_data(client, page,
437 pmbus_fan_config_registers[id]);
441 have_rpm = !!(config & pmbus_fan_rpm_mask[id]);
442 if (want_rpm == have_rpm)
443 return pmbus_read_word_data(client, page,
444 pmbus_fan_command_registers[id]);
446 /* Can't sensibly map between RPM and PWM, just return zero */
450 int pmbus_get_fan_rate_device(struct i2c_client *client, int page, int id,
451 enum pmbus_fan_mode mode)
453 return pmbus_get_fan_rate(client, page, id, mode, false);
455 EXPORT_SYMBOL_GPL(pmbus_get_fan_rate_device);
457 int pmbus_get_fan_rate_cached(struct i2c_client *client, int page, int id,
458 enum pmbus_fan_mode mode)
460 return pmbus_get_fan_rate(client, page, id, mode, true);
462 EXPORT_SYMBOL_GPL(pmbus_get_fan_rate_cached);
464 static void pmbus_clear_fault_page(struct i2c_client *client, int page)
466 _pmbus_write_byte(client, page, PMBUS_CLEAR_FAULTS);
469 void pmbus_clear_faults(struct i2c_client *client)
471 struct pmbus_data *data = i2c_get_clientdata(client);
474 for (i = 0; i < data->info->pages; i++)
475 pmbus_clear_fault_page(client, i);
477 EXPORT_SYMBOL_GPL(pmbus_clear_faults);
479 static int pmbus_check_status_cml(struct i2c_client *client)
481 struct pmbus_data *data = i2c_get_clientdata(client);
484 status = data->read_status(client, -1);
485 if (status < 0 || (status & PB_STATUS_CML)) {
486 status2 = _pmbus_read_byte_data(client, -1, PMBUS_STATUS_CML);
487 if (status2 < 0 || (status2 & PB_CML_FAULT_INVALID_COMMAND))
493 static bool pmbus_check_register(struct i2c_client *client,
494 int (*func)(struct i2c_client *client,
499 struct pmbus_data *data = i2c_get_clientdata(client);
501 rv = func(client, page, reg);
502 if (rv >= 0 && !(data->flags & PMBUS_SKIP_STATUS_CHECK))
503 rv = pmbus_check_status_cml(client);
504 pmbus_clear_fault_page(client, -1);
508 static bool pmbus_check_status_register(struct i2c_client *client, int page)
511 struct pmbus_data *data = i2c_get_clientdata(client);
513 status = data->read_status(client, page);
514 if (status >= 0 && !(data->flags & PMBUS_SKIP_STATUS_CHECK) &&
515 (status & PB_STATUS_CML)) {
516 status = _pmbus_read_byte_data(client, -1, PMBUS_STATUS_CML);
517 if (status < 0 || (status & PB_CML_FAULT_INVALID_COMMAND))
521 pmbus_clear_fault_page(client, -1);
525 bool pmbus_check_byte_register(struct i2c_client *client, int page, int reg)
527 return pmbus_check_register(client, _pmbus_read_byte_data, page, reg);
529 EXPORT_SYMBOL_GPL(pmbus_check_byte_register);
531 bool pmbus_check_word_register(struct i2c_client *client, int page, int reg)
533 return pmbus_check_register(client, _pmbus_read_word_data, page, reg);
535 EXPORT_SYMBOL_GPL(pmbus_check_word_register);
537 const struct pmbus_driver_info *pmbus_get_driver_info(struct i2c_client *client)
539 struct pmbus_data *data = i2c_get_clientdata(client);
543 EXPORT_SYMBOL_GPL(pmbus_get_driver_info);
545 static struct _pmbus_status {
550 { PMBUS_HAVE_STATUS_VOUT, PB_STATUS_VOUT_BASE, PMBUS_STATUS_VOUT },
551 { PMBUS_HAVE_STATUS_IOUT, PB_STATUS_IOUT_BASE, PMBUS_STATUS_IOUT },
552 { PMBUS_HAVE_STATUS_TEMP, PB_STATUS_TEMP_BASE,
553 PMBUS_STATUS_TEMPERATURE },
554 { PMBUS_HAVE_STATUS_FAN12, PB_STATUS_FAN_BASE, PMBUS_STATUS_FAN_12 },
555 { PMBUS_HAVE_STATUS_FAN34, PB_STATUS_FAN34_BASE, PMBUS_STATUS_FAN_34 },
558 static struct pmbus_data *pmbus_update_device(struct device *dev)
560 struct i2c_client *client = to_i2c_client(dev->parent);
561 struct pmbus_data *data = i2c_get_clientdata(client);
562 const struct pmbus_driver_info *info = data->info;
563 struct pmbus_sensor *sensor;
565 mutex_lock(&data->update_lock);
566 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
569 for (i = 0; i < info->pages; i++) {
570 data->status[PB_STATUS_BASE + i]
571 = data->read_status(client, i);
572 for (j = 0; j < ARRAY_SIZE(pmbus_status); j++) {
573 struct _pmbus_status *s = &pmbus_status[j];
575 if (!(info->func[i] & s->func))
577 data->status[s->base + i]
578 = _pmbus_read_byte_data(client, i,
583 if (info->func[0] & PMBUS_HAVE_STATUS_INPUT)
584 data->status[PB_STATUS_INPUT_BASE]
585 = _pmbus_read_byte_data(client, 0,
588 if (info->func[0] & PMBUS_HAVE_STATUS_VMON)
589 data->status[PB_STATUS_VMON_BASE]
590 = _pmbus_read_byte_data(client, 0,
591 PMBUS_VIRT_STATUS_VMON);
593 for (sensor = data->sensors; sensor; sensor = sensor->next) {
594 if (!data->valid || sensor->update)
596 = _pmbus_read_word_data(client,
600 pmbus_clear_faults(client);
601 data->last_updated = jiffies;
604 mutex_unlock(&data->update_lock);
609 * Convert linear sensor values to milli- or micro-units
610 * depending on sensor type.
612 static long pmbus_reg2data_linear(struct pmbus_data *data,
613 struct pmbus_sensor *sensor)
619 if (sensor->class == PSC_VOLTAGE_OUT) { /* LINEAR16 */
620 exponent = data->exponent[sensor->page];
621 mantissa = (u16) sensor->data;
622 } else { /* LINEAR11 */
623 exponent = ((s16)sensor->data) >> 11;
624 mantissa = ((s16)((sensor->data & 0x7ff) << 5)) >> 5;
629 /* scale result to milli-units for all sensors except fans */
630 if (sensor->class != PSC_FAN)
633 /* scale result to micro-units for power sensors */
634 if (sensor->class == PSC_POWER)
646 * Convert direct sensor values to milli- or micro-units
647 * depending on sensor type.
649 static long pmbus_reg2data_direct(struct pmbus_data *data,
650 struct pmbus_sensor *sensor)
652 s64 b, val = (s16)sensor->data;
655 m = data->info->m[sensor->class];
656 b = data->info->b[sensor->class];
657 R = data->info->R[sensor->class];
662 /* X = 1/m * (Y * 10^-R - b) */
664 /* scale result to milli-units for everything but fans */
665 if (!(sensor->class == PSC_FAN || sensor->class == PSC_PWM)) {
670 /* scale result to micro-units for power sensors */
671 if (sensor->class == PSC_POWER) {
681 val = div_s64(val + 5LL, 10L); /* round closest */
685 val = div_s64(val - b, m);
686 return clamp_val(val, LONG_MIN, LONG_MAX);
690 * Convert VID sensor values to milli- or micro-units
691 * depending on sensor type.
693 static long pmbus_reg2data_vid(struct pmbus_data *data,
694 struct pmbus_sensor *sensor)
696 long val = sensor->data;
699 switch (data->info->vrm_version) {
701 if (val >= 0x02 && val <= 0xb2)
702 rv = DIV_ROUND_CLOSEST(160000 - (val - 2) * 625, 100);
706 rv = 250 + (val - 1) * 5;
710 rv = 500 + (val - 1) * 10;
716 static long pmbus_reg2data(struct pmbus_data *data, struct pmbus_sensor *sensor)
720 if (!sensor->convert)
723 switch (data->info->format[sensor->class]) {
725 val = pmbus_reg2data_direct(data, sensor);
728 val = pmbus_reg2data_vid(data, sensor);
732 val = pmbus_reg2data_linear(data, sensor);
738 #define MAX_MANTISSA (1023 * 1000)
739 #define MIN_MANTISSA (511 * 1000)
741 static u16 pmbus_data2reg_linear(struct pmbus_data *data,
742 struct pmbus_sensor *sensor, long val)
744 s16 exponent = 0, mantissa;
745 bool negative = false;
751 if (sensor->class == PSC_VOLTAGE_OUT) {
752 /* LINEAR16 does not support negative voltages */
757 * For a static exponents, we don't have a choice
758 * but to adjust the value to it.
760 if (data->exponent[sensor->page] < 0)
761 val <<= -data->exponent[sensor->page];
763 val >>= data->exponent[sensor->page];
764 val = DIV_ROUND_CLOSEST(val, 1000);
773 /* Power is in uW. Convert to mW before converting. */
774 if (sensor->class == PSC_POWER)
775 val = DIV_ROUND_CLOSEST(val, 1000L);
778 * For simplicity, convert fan data to milli-units
779 * before calculating the exponent.
781 if (sensor->class == PSC_FAN)
784 /* Reduce large mantissa until it fits into 10 bit */
785 while (val >= MAX_MANTISSA && exponent < 15) {
789 /* Increase small mantissa to improve precision */
790 while (val < MIN_MANTISSA && exponent > -15) {
795 /* Convert mantissa from milli-units to units */
796 mantissa = DIV_ROUND_CLOSEST(val, 1000);
798 /* Ensure that resulting number is within range */
799 if (mantissa > 0x3ff)
804 mantissa = -mantissa;
806 /* Convert to 5 bit exponent, 11 bit mantissa */
807 return (mantissa & 0x7ff) | ((exponent << 11) & 0xf800);
810 static u16 pmbus_data2reg_direct(struct pmbus_data *data,
811 struct pmbus_sensor *sensor, long val)
816 m = data->info->m[sensor->class];
817 b = data->info->b[sensor->class];
818 R = data->info->R[sensor->class];
820 /* Power is in uW. Adjust R and b. */
821 if (sensor->class == PSC_POWER) {
826 /* Calculate Y = (m * X + b) * 10^R */
827 if (!(sensor->class == PSC_FAN || sensor->class == PSC_PWM)) {
828 R -= 3; /* Adjust R and b for data in milli-units */
831 val64 = val64 * m + b;
838 val64 = div_s64(val64 + 5LL, 10L); /* round closest */
842 return (u16)clamp_val(val64, S16_MIN, S16_MAX);
845 static u16 pmbus_data2reg_vid(struct pmbus_data *data,
846 struct pmbus_sensor *sensor, long val)
848 val = clamp_val(val, 500, 1600);
850 return 2 + DIV_ROUND_CLOSEST((1600 - val) * 100, 625);
853 static u16 pmbus_data2reg(struct pmbus_data *data,
854 struct pmbus_sensor *sensor, long val)
858 if (!sensor->convert)
861 switch (data->info->format[sensor->class]) {
863 regval = pmbus_data2reg_direct(data, sensor, val);
866 regval = pmbus_data2reg_vid(data, sensor, val);
870 regval = pmbus_data2reg_linear(data, sensor, val);
877 * Return boolean calculated from converted data.
878 * <index> defines a status register index and mask.
879 * The mask is in the lower 8 bits, the register index is in bits 8..23.
881 * The associated pmbus_boolean structure contains optional pointers to two
882 * sensor attributes. If specified, those attributes are compared against each
883 * other to determine if a limit has been exceeded.
885 * If the sensor attribute pointers are NULL, the function returns true if
886 * (status[reg] & mask) is true.
888 * If sensor attribute pointers are provided, a comparison against a specified
889 * limit has to be performed to determine the boolean result.
890 * In this case, the function returns true if v1 >= v2 (where v1 and v2 are
891 * sensor values referenced by sensor attribute pointers s1 and s2).
893 * To determine if an object exceeds upper limits, specify <s1,s2> = <v,limit>.
894 * To determine if an object exceeds lower limits, specify <s1,s2> = <limit,v>.
896 * If a negative value is stored in any of the referenced registers, this value
897 * reflects an error code which will be returned.
899 static int pmbus_get_boolean(struct pmbus_data *data, struct pmbus_boolean *b,
902 struct pmbus_sensor *s1 = b->s1;
903 struct pmbus_sensor *s2 = b->s2;
904 u16 reg = (index >> 16) & 0xffff;
905 u16 mask = index & 0xffff;
909 status = data->status[reg];
913 regval = status & mask;
916 } else if (!s1 || !s2) {
917 WARN(1, "Bad boolean descriptor %p: s1=%p, s2=%p\n", b, s1, s2);
927 v1 = pmbus_reg2data(data, s1);
928 v2 = pmbus_reg2data(data, s2);
929 ret = !!(regval && v1 >= v2);
934 static ssize_t pmbus_show_boolean(struct device *dev,
935 struct device_attribute *da, char *buf)
937 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
938 struct pmbus_boolean *boolean = to_pmbus_boolean(attr);
939 struct pmbus_data *data = pmbus_update_device(dev);
942 val = pmbus_get_boolean(data, boolean, attr->index);
945 return snprintf(buf, PAGE_SIZE, "%d\n", val);
948 static ssize_t pmbus_show_sensor(struct device *dev,
949 struct device_attribute *devattr, char *buf)
951 struct pmbus_data *data = pmbus_update_device(dev);
952 struct pmbus_sensor *sensor = to_pmbus_sensor(devattr);
954 if (sensor->data < 0)
957 return snprintf(buf, PAGE_SIZE, "%ld\n", pmbus_reg2data(data, sensor));
960 static ssize_t pmbus_set_sensor(struct device *dev,
961 struct device_attribute *devattr,
962 const char *buf, size_t count)
964 struct i2c_client *client = to_i2c_client(dev->parent);
965 struct pmbus_data *data = i2c_get_clientdata(client);
966 struct pmbus_sensor *sensor = to_pmbus_sensor(devattr);
972 if (kstrtol(buf, 10, &val) < 0)
975 mutex_lock(&data->update_lock);
976 regval = pmbus_data2reg(data, sensor, val);
977 ret = _pmbus_write_word_data(client, sensor->page, sensor->reg, regval);
981 sensor->data = regval;
982 mutex_unlock(&data->update_lock);
986 static ssize_t pmbus_show_label(struct device *dev,
987 struct device_attribute *da, char *buf)
989 struct pmbus_label *label = to_pmbus_label(da);
991 return snprintf(buf, PAGE_SIZE, "%s\n", label->label);
994 static int pmbus_add_attribute(struct pmbus_data *data, struct attribute *attr)
996 if (data->num_attributes >= data->max_attributes - 1) {
997 int new_max_attrs = data->max_attributes + PMBUS_ATTR_ALLOC_SIZE;
998 void *new_attrs = krealloc(data->group.attrs,
999 new_max_attrs * sizeof(void *),
1003 data->group.attrs = new_attrs;
1004 data->max_attributes = new_max_attrs;
1007 data->group.attrs[data->num_attributes++] = attr;
1008 data->group.attrs[data->num_attributes] = NULL;
1012 static void pmbus_dev_attr_init(struct device_attribute *dev_attr,
1015 ssize_t (*show)(struct device *dev,
1016 struct device_attribute *attr,
1018 ssize_t (*store)(struct device *dev,
1019 struct device_attribute *attr,
1020 const char *buf, size_t count))
1022 sysfs_attr_init(&dev_attr->attr);
1023 dev_attr->attr.name = name;
1024 dev_attr->attr.mode = mode;
1025 dev_attr->show = show;
1026 dev_attr->store = store;
1029 static void pmbus_attr_init(struct sensor_device_attribute *a,
1032 ssize_t (*show)(struct device *dev,
1033 struct device_attribute *attr,
1035 ssize_t (*store)(struct device *dev,
1036 struct device_attribute *attr,
1037 const char *buf, size_t count),
1040 pmbus_dev_attr_init(&a->dev_attr, name, mode, show, store);
1044 static int pmbus_add_boolean(struct pmbus_data *data,
1045 const char *name, const char *type, int seq,
1046 struct pmbus_sensor *s1,
1047 struct pmbus_sensor *s2,
1050 struct pmbus_boolean *boolean;
1051 struct sensor_device_attribute *a;
1053 boolean = devm_kzalloc(data->dev, sizeof(*boolean), GFP_KERNEL);
1057 a = &boolean->attribute;
1059 snprintf(boolean->name, sizeof(boolean->name), "%s%d_%s",
1063 pmbus_attr_init(a, boolean->name, 0444, pmbus_show_boolean, NULL,
1064 (reg << 16) | mask);
1066 return pmbus_add_attribute(data, &a->dev_attr.attr);
1069 static struct pmbus_sensor *pmbus_add_sensor(struct pmbus_data *data,
1070 const char *name, const char *type,
1071 int seq, int page, int reg,
1072 enum pmbus_sensor_classes class,
1073 bool update, bool readonly,
1076 struct pmbus_sensor *sensor;
1077 struct device_attribute *a;
1079 sensor = devm_kzalloc(data->dev, sizeof(*sensor), GFP_KERNEL);
1082 a = &sensor->attribute;
1085 snprintf(sensor->name, sizeof(sensor->name), "%s%d_%s",
1088 snprintf(sensor->name, sizeof(sensor->name), "%s%d",
1091 sensor->page = page;
1093 sensor->class = class;
1094 sensor->update = update;
1095 sensor->convert = convert;
1096 pmbus_dev_attr_init(a, sensor->name,
1097 readonly ? 0444 : 0644,
1098 pmbus_show_sensor, pmbus_set_sensor);
1100 if (pmbus_add_attribute(data, &a->attr))
1103 sensor->next = data->sensors;
1104 data->sensors = sensor;
1109 static int pmbus_add_label(struct pmbus_data *data,
1110 const char *name, int seq,
1111 const char *lstring, int index)
1113 struct pmbus_label *label;
1114 struct device_attribute *a;
1116 label = devm_kzalloc(data->dev, sizeof(*label), GFP_KERNEL);
1120 a = &label->attribute;
1122 snprintf(label->name, sizeof(label->name), "%s%d_label", name, seq);
1124 strncpy(label->label, lstring, sizeof(label->label) - 1);
1126 snprintf(label->label, sizeof(label->label), "%s%d", lstring,
1129 pmbus_dev_attr_init(a, label->name, 0444, pmbus_show_label, NULL);
1130 return pmbus_add_attribute(data, &a->attr);
1134 * Search for attributes. Allocate sensors, booleans, and labels as needed.
1138 * The pmbus_limit_attr structure describes a single limit attribute
1139 * and its associated alarm attribute.
1141 struct pmbus_limit_attr {
1142 u16 reg; /* Limit register */
1143 u16 sbit; /* Alarm attribute status bit */
1144 bool update; /* True if register needs updates */
1145 bool low; /* True if low limit; for limits with compare
1147 const char *attr; /* Attribute name */
1148 const char *alarm; /* Alarm attribute name */
1152 * The pmbus_sensor_attr structure describes one sensor attribute. This
1153 * description includes a reference to the associated limit attributes.
1155 struct pmbus_sensor_attr {
1156 u16 reg; /* sensor register */
1157 u16 gbit; /* generic status bit */
1158 u8 nlimit; /* # of limit registers */
1159 enum pmbus_sensor_classes class;/* sensor class */
1160 const char *label; /* sensor label */
1161 bool paged; /* true if paged sensor */
1162 bool update; /* true if update needed */
1163 bool compare; /* true if compare function needed */
1164 u32 func; /* sensor mask */
1165 u32 sfunc; /* sensor status mask */
1166 int sbase; /* status base register */
1167 const struct pmbus_limit_attr *limit;/* limit registers */
1171 * Add a set of limit attributes and, if supported, the associated
1173 * returns 0 if no alarm register found, 1 if an alarm register was found,
1176 static int pmbus_add_limit_attrs(struct i2c_client *client,
1177 struct pmbus_data *data,
1178 const struct pmbus_driver_info *info,
1179 const char *name, int index, int page,
1180 struct pmbus_sensor *base,
1181 const struct pmbus_sensor_attr *attr)
1183 const struct pmbus_limit_attr *l = attr->limit;
1184 int nlimit = attr->nlimit;
1187 struct pmbus_sensor *curr;
1189 for (i = 0; i < nlimit; i++) {
1190 if (pmbus_check_word_register(client, page, l->reg)) {
1191 curr = pmbus_add_sensor(data, name, l->attr, index,
1192 page, l->reg, attr->class,
1193 attr->update || l->update,
1197 if (l->sbit && (info->func[page] & attr->sfunc)) {
1198 ret = pmbus_add_boolean(data, name,
1200 attr->compare ? l->low ? curr : base
1202 attr->compare ? l->low ? base : curr
1204 attr->sbase + page, l->sbit);
1215 static int pmbus_add_sensor_attrs_one(struct i2c_client *client,
1216 struct pmbus_data *data,
1217 const struct pmbus_driver_info *info,
1219 int index, int page,
1220 const struct pmbus_sensor_attr *attr,
1223 struct pmbus_sensor *base;
1224 bool upper = !!(attr->gbit & 0xff00); /* need to check STATUS_WORD */
1228 ret = pmbus_add_label(data, name, index, attr->label,
1229 paged ? page + 1 : 0);
1233 base = pmbus_add_sensor(data, name, "input", index, page, attr->reg,
1234 attr->class, true, true, true);
1238 ret = pmbus_add_limit_attrs(client, data, info, name,
1239 index, page, base, attr);
1243 * Add generic alarm attribute only if there are no individual
1244 * alarm attributes, if there is a global alarm bit, and if
1245 * the generic status register (word or byte, depending on
1246 * which global bit is set) for this page is accessible.
1248 if (!ret && attr->gbit &&
1249 (!upper || (upper && data->has_status_word)) &&
1250 pmbus_check_status_register(client, page)) {
1251 ret = pmbus_add_boolean(data, name, "alarm", index,
1253 PB_STATUS_BASE + page,
1262 static bool pmbus_sensor_is_paged(const struct pmbus_driver_info *info,
1263 const struct pmbus_sensor_attr *attr)
1271 * Some attributes may be present on more than one page despite
1272 * not being marked with the paged attribute. If that is the case,
1273 * then treat the sensor as being paged and add the page suffix to the
1275 * We don't just add the paged attribute to all such attributes, in
1276 * order to maintain the un-suffixed labels in the case where the
1277 * attribute is only on page 0.
1279 for (p = 1; p < info->pages; p++) {
1280 if (info->func[p] & attr->func)
1286 static int pmbus_add_sensor_attrs(struct i2c_client *client,
1287 struct pmbus_data *data,
1289 const struct pmbus_sensor_attr *attrs,
1292 const struct pmbus_driver_info *info = data->info;
1297 for (i = 0; i < nattrs; i++) {
1299 bool paged = pmbus_sensor_is_paged(info, attrs);
1301 pages = paged ? info->pages : 1;
1302 for (page = 0; page < pages; page++) {
1303 if (!(info->func[page] & attrs->func))
1305 ret = pmbus_add_sensor_attrs_one(client, data, info,
1317 static const struct pmbus_limit_attr vin_limit_attrs[] = {
1319 .reg = PMBUS_VIN_UV_WARN_LIMIT,
1321 .alarm = "min_alarm",
1322 .sbit = PB_VOLTAGE_UV_WARNING,
1324 .reg = PMBUS_VIN_UV_FAULT_LIMIT,
1326 .alarm = "lcrit_alarm",
1327 .sbit = PB_VOLTAGE_UV_FAULT,
1329 .reg = PMBUS_VIN_OV_WARN_LIMIT,
1331 .alarm = "max_alarm",
1332 .sbit = PB_VOLTAGE_OV_WARNING,
1334 .reg = PMBUS_VIN_OV_FAULT_LIMIT,
1336 .alarm = "crit_alarm",
1337 .sbit = PB_VOLTAGE_OV_FAULT,
1339 .reg = PMBUS_VIRT_READ_VIN_AVG,
1343 .reg = PMBUS_VIRT_READ_VIN_MIN,
1347 .reg = PMBUS_VIRT_READ_VIN_MAX,
1351 .reg = PMBUS_VIRT_RESET_VIN_HISTORY,
1352 .attr = "reset_history",
1356 static const struct pmbus_limit_attr vmon_limit_attrs[] = {
1358 .reg = PMBUS_VIRT_VMON_UV_WARN_LIMIT,
1360 .alarm = "min_alarm",
1361 .sbit = PB_VOLTAGE_UV_WARNING,
1363 .reg = PMBUS_VIRT_VMON_UV_FAULT_LIMIT,
1365 .alarm = "lcrit_alarm",
1366 .sbit = PB_VOLTAGE_UV_FAULT,
1368 .reg = PMBUS_VIRT_VMON_OV_WARN_LIMIT,
1370 .alarm = "max_alarm",
1371 .sbit = PB_VOLTAGE_OV_WARNING,
1373 .reg = PMBUS_VIRT_VMON_OV_FAULT_LIMIT,
1375 .alarm = "crit_alarm",
1376 .sbit = PB_VOLTAGE_OV_FAULT,
1380 static const struct pmbus_limit_attr vout_limit_attrs[] = {
1382 .reg = PMBUS_VOUT_UV_WARN_LIMIT,
1384 .alarm = "min_alarm",
1385 .sbit = PB_VOLTAGE_UV_WARNING,
1387 .reg = PMBUS_VOUT_UV_FAULT_LIMIT,
1389 .alarm = "lcrit_alarm",
1390 .sbit = PB_VOLTAGE_UV_FAULT,
1392 .reg = PMBUS_VOUT_OV_WARN_LIMIT,
1394 .alarm = "max_alarm",
1395 .sbit = PB_VOLTAGE_OV_WARNING,
1397 .reg = PMBUS_VOUT_OV_FAULT_LIMIT,
1399 .alarm = "crit_alarm",
1400 .sbit = PB_VOLTAGE_OV_FAULT,
1402 .reg = PMBUS_VIRT_READ_VOUT_AVG,
1406 .reg = PMBUS_VIRT_READ_VOUT_MIN,
1410 .reg = PMBUS_VIRT_READ_VOUT_MAX,
1414 .reg = PMBUS_VIRT_RESET_VOUT_HISTORY,
1415 .attr = "reset_history",
1419 static const struct pmbus_sensor_attr voltage_attributes[] = {
1421 .reg = PMBUS_READ_VIN,
1422 .class = PSC_VOLTAGE_IN,
1424 .func = PMBUS_HAVE_VIN,
1425 .sfunc = PMBUS_HAVE_STATUS_INPUT,
1426 .sbase = PB_STATUS_INPUT_BASE,
1427 .gbit = PB_STATUS_VIN_UV,
1428 .limit = vin_limit_attrs,
1429 .nlimit = ARRAY_SIZE(vin_limit_attrs),
1431 .reg = PMBUS_VIRT_READ_VMON,
1432 .class = PSC_VOLTAGE_IN,
1434 .func = PMBUS_HAVE_VMON,
1435 .sfunc = PMBUS_HAVE_STATUS_VMON,
1436 .sbase = PB_STATUS_VMON_BASE,
1437 .limit = vmon_limit_attrs,
1438 .nlimit = ARRAY_SIZE(vmon_limit_attrs),
1440 .reg = PMBUS_READ_VCAP,
1441 .class = PSC_VOLTAGE_IN,
1443 .func = PMBUS_HAVE_VCAP,
1445 .reg = PMBUS_READ_VOUT,
1446 .class = PSC_VOLTAGE_OUT,
1449 .func = PMBUS_HAVE_VOUT,
1450 .sfunc = PMBUS_HAVE_STATUS_VOUT,
1451 .sbase = PB_STATUS_VOUT_BASE,
1452 .gbit = PB_STATUS_VOUT_OV,
1453 .limit = vout_limit_attrs,
1454 .nlimit = ARRAY_SIZE(vout_limit_attrs),
1458 /* Current attributes */
1460 static const struct pmbus_limit_attr iin_limit_attrs[] = {
1462 .reg = PMBUS_IIN_OC_WARN_LIMIT,
1464 .alarm = "max_alarm",
1465 .sbit = PB_IIN_OC_WARNING,
1467 .reg = PMBUS_IIN_OC_FAULT_LIMIT,
1469 .alarm = "crit_alarm",
1470 .sbit = PB_IIN_OC_FAULT,
1472 .reg = PMBUS_VIRT_READ_IIN_AVG,
1476 .reg = PMBUS_VIRT_READ_IIN_MIN,
1480 .reg = PMBUS_VIRT_READ_IIN_MAX,
1484 .reg = PMBUS_VIRT_RESET_IIN_HISTORY,
1485 .attr = "reset_history",
1489 static const struct pmbus_limit_attr iout_limit_attrs[] = {
1491 .reg = PMBUS_IOUT_OC_WARN_LIMIT,
1493 .alarm = "max_alarm",
1494 .sbit = PB_IOUT_OC_WARNING,
1496 .reg = PMBUS_IOUT_UC_FAULT_LIMIT,
1498 .alarm = "lcrit_alarm",
1499 .sbit = PB_IOUT_UC_FAULT,
1501 .reg = PMBUS_IOUT_OC_FAULT_LIMIT,
1503 .alarm = "crit_alarm",
1504 .sbit = PB_IOUT_OC_FAULT,
1506 .reg = PMBUS_VIRT_READ_IOUT_AVG,
1510 .reg = PMBUS_VIRT_READ_IOUT_MIN,
1514 .reg = PMBUS_VIRT_READ_IOUT_MAX,
1518 .reg = PMBUS_VIRT_RESET_IOUT_HISTORY,
1519 .attr = "reset_history",
1523 static const struct pmbus_sensor_attr current_attributes[] = {
1525 .reg = PMBUS_READ_IIN,
1526 .class = PSC_CURRENT_IN,
1528 .func = PMBUS_HAVE_IIN,
1529 .sfunc = PMBUS_HAVE_STATUS_INPUT,
1530 .sbase = PB_STATUS_INPUT_BASE,
1531 .gbit = PB_STATUS_INPUT,
1532 .limit = iin_limit_attrs,
1533 .nlimit = ARRAY_SIZE(iin_limit_attrs),
1535 .reg = PMBUS_READ_IOUT,
1536 .class = PSC_CURRENT_OUT,
1539 .func = PMBUS_HAVE_IOUT,
1540 .sfunc = PMBUS_HAVE_STATUS_IOUT,
1541 .sbase = PB_STATUS_IOUT_BASE,
1542 .gbit = PB_STATUS_IOUT_OC,
1543 .limit = iout_limit_attrs,
1544 .nlimit = ARRAY_SIZE(iout_limit_attrs),
1548 /* Power attributes */
1550 static const struct pmbus_limit_attr pin_limit_attrs[] = {
1552 .reg = PMBUS_PIN_OP_WARN_LIMIT,
1555 .sbit = PB_PIN_OP_WARNING,
1557 .reg = PMBUS_VIRT_READ_PIN_AVG,
1561 .reg = PMBUS_VIRT_READ_PIN_MIN,
1563 .attr = "input_lowest",
1565 .reg = PMBUS_VIRT_READ_PIN_MAX,
1567 .attr = "input_highest",
1569 .reg = PMBUS_VIRT_RESET_PIN_HISTORY,
1570 .attr = "reset_history",
1574 static const struct pmbus_limit_attr pout_limit_attrs[] = {
1576 .reg = PMBUS_POUT_MAX,
1578 .alarm = "cap_alarm",
1579 .sbit = PB_POWER_LIMITING,
1581 .reg = PMBUS_POUT_OP_WARN_LIMIT,
1583 .alarm = "max_alarm",
1584 .sbit = PB_POUT_OP_WARNING,
1586 .reg = PMBUS_POUT_OP_FAULT_LIMIT,
1588 .alarm = "crit_alarm",
1589 .sbit = PB_POUT_OP_FAULT,
1591 .reg = PMBUS_VIRT_READ_POUT_AVG,
1595 .reg = PMBUS_VIRT_READ_POUT_MIN,
1597 .attr = "input_lowest",
1599 .reg = PMBUS_VIRT_READ_POUT_MAX,
1601 .attr = "input_highest",
1603 .reg = PMBUS_VIRT_RESET_POUT_HISTORY,
1604 .attr = "reset_history",
1608 static const struct pmbus_sensor_attr power_attributes[] = {
1610 .reg = PMBUS_READ_PIN,
1613 .func = PMBUS_HAVE_PIN,
1614 .sfunc = PMBUS_HAVE_STATUS_INPUT,
1615 .sbase = PB_STATUS_INPUT_BASE,
1616 .gbit = PB_STATUS_INPUT,
1617 .limit = pin_limit_attrs,
1618 .nlimit = ARRAY_SIZE(pin_limit_attrs),
1620 .reg = PMBUS_READ_POUT,
1624 .func = PMBUS_HAVE_POUT,
1625 .sfunc = PMBUS_HAVE_STATUS_IOUT,
1626 .sbase = PB_STATUS_IOUT_BASE,
1627 .limit = pout_limit_attrs,
1628 .nlimit = ARRAY_SIZE(pout_limit_attrs),
1632 /* Temperature atributes */
1634 static const struct pmbus_limit_attr temp_limit_attrs[] = {
1636 .reg = PMBUS_UT_WARN_LIMIT,
1639 .alarm = "min_alarm",
1640 .sbit = PB_TEMP_UT_WARNING,
1642 .reg = PMBUS_UT_FAULT_LIMIT,
1645 .alarm = "lcrit_alarm",
1646 .sbit = PB_TEMP_UT_FAULT,
1648 .reg = PMBUS_OT_WARN_LIMIT,
1650 .alarm = "max_alarm",
1651 .sbit = PB_TEMP_OT_WARNING,
1653 .reg = PMBUS_OT_FAULT_LIMIT,
1655 .alarm = "crit_alarm",
1656 .sbit = PB_TEMP_OT_FAULT,
1658 .reg = PMBUS_VIRT_READ_TEMP_MIN,
1661 .reg = PMBUS_VIRT_READ_TEMP_AVG,
1664 .reg = PMBUS_VIRT_READ_TEMP_MAX,
1667 .reg = PMBUS_VIRT_RESET_TEMP_HISTORY,
1668 .attr = "reset_history",
1672 static const struct pmbus_limit_attr temp_limit_attrs2[] = {
1674 .reg = PMBUS_UT_WARN_LIMIT,
1677 .alarm = "min_alarm",
1678 .sbit = PB_TEMP_UT_WARNING,
1680 .reg = PMBUS_UT_FAULT_LIMIT,
1683 .alarm = "lcrit_alarm",
1684 .sbit = PB_TEMP_UT_FAULT,
1686 .reg = PMBUS_OT_WARN_LIMIT,
1688 .alarm = "max_alarm",
1689 .sbit = PB_TEMP_OT_WARNING,
1691 .reg = PMBUS_OT_FAULT_LIMIT,
1693 .alarm = "crit_alarm",
1694 .sbit = PB_TEMP_OT_FAULT,
1696 .reg = PMBUS_VIRT_READ_TEMP2_MIN,
1699 .reg = PMBUS_VIRT_READ_TEMP2_AVG,
1702 .reg = PMBUS_VIRT_READ_TEMP2_MAX,
1705 .reg = PMBUS_VIRT_RESET_TEMP2_HISTORY,
1706 .attr = "reset_history",
1710 static const struct pmbus_limit_attr temp_limit_attrs3[] = {
1712 .reg = PMBUS_UT_WARN_LIMIT,
1715 .alarm = "min_alarm",
1716 .sbit = PB_TEMP_UT_WARNING,
1718 .reg = PMBUS_UT_FAULT_LIMIT,
1721 .alarm = "lcrit_alarm",
1722 .sbit = PB_TEMP_UT_FAULT,
1724 .reg = PMBUS_OT_WARN_LIMIT,
1726 .alarm = "max_alarm",
1727 .sbit = PB_TEMP_OT_WARNING,
1729 .reg = PMBUS_OT_FAULT_LIMIT,
1731 .alarm = "crit_alarm",
1732 .sbit = PB_TEMP_OT_FAULT,
1736 static const struct pmbus_sensor_attr temp_attributes[] = {
1738 .reg = PMBUS_READ_TEMPERATURE_1,
1739 .class = PSC_TEMPERATURE,
1743 .func = PMBUS_HAVE_TEMP,
1744 .sfunc = PMBUS_HAVE_STATUS_TEMP,
1745 .sbase = PB_STATUS_TEMP_BASE,
1746 .gbit = PB_STATUS_TEMPERATURE,
1747 .limit = temp_limit_attrs,
1748 .nlimit = ARRAY_SIZE(temp_limit_attrs),
1750 .reg = PMBUS_READ_TEMPERATURE_2,
1751 .class = PSC_TEMPERATURE,
1755 .func = PMBUS_HAVE_TEMP2,
1756 .sfunc = PMBUS_HAVE_STATUS_TEMP,
1757 .sbase = PB_STATUS_TEMP_BASE,
1758 .gbit = PB_STATUS_TEMPERATURE,
1759 .limit = temp_limit_attrs2,
1760 .nlimit = ARRAY_SIZE(temp_limit_attrs2),
1762 .reg = PMBUS_READ_TEMPERATURE_3,
1763 .class = PSC_TEMPERATURE,
1767 .func = PMBUS_HAVE_TEMP3,
1768 .sfunc = PMBUS_HAVE_STATUS_TEMP,
1769 .sbase = PB_STATUS_TEMP_BASE,
1770 .gbit = PB_STATUS_TEMPERATURE,
1771 .limit = temp_limit_attrs3,
1772 .nlimit = ARRAY_SIZE(temp_limit_attrs3),
1776 static const int pmbus_fan_registers[] = {
1777 PMBUS_READ_FAN_SPEED_1,
1778 PMBUS_READ_FAN_SPEED_2,
1779 PMBUS_READ_FAN_SPEED_3,
1780 PMBUS_READ_FAN_SPEED_4
1783 static const int pmbus_fan_status_registers[] = {
1784 PMBUS_STATUS_FAN_12,
1785 PMBUS_STATUS_FAN_12,
1786 PMBUS_STATUS_FAN_34,
1790 static const u32 pmbus_fan_flags[] = {
1797 static const u32 pmbus_fan_status_flags[] = {
1798 PMBUS_HAVE_STATUS_FAN12,
1799 PMBUS_HAVE_STATUS_FAN12,
1800 PMBUS_HAVE_STATUS_FAN34,
1801 PMBUS_HAVE_STATUS_FAN34
1806 /* Precondition: FAN_CONFIG_x_y and FAN_COMMAND_x must exist for the fan ID */
1807 static int pmbus_add_fan_ctrl(struct i2c_client *client,
1808 struct pmbus_data *data, int index, int page, int id,
1811 struct pmbus_sensor *sensor;
1813 sensor = pmbus_add_sensor(data, "fan", "target", index, page,
1814 PMBUS_VIRT_FAN_TARGET_1 + id, PSC_FAN,
1815 false, false, true);
1820 if (!((data->info->func[page] & PMBUS_HAVE_PWM12) ||
1821 (data->info->func[page] & PMBUS_HAVE_PWM34)))
1824 sensor = pmbus_add_sensor(data, "pwm", NULL, index, page,
1825 PMBUS_VIRT_PWM_1 + id, PSC_PWM,
1826 false, false, true);
1831 sensor = pmbus_add_sensor(data, "pwm", "enable", index, page,
1832 PMBUS_VIRT_PWM_ENABLE_1 + id, PSC_PWM,
1833 true, false, false);
1841 static int pmbus_add_fan_attributes(struct i2c_client *client,
1842 struct pmbus_data *data)
1844 const struct pmbus_driver_info *info = data->info;
1849 for (page = 0; page < info->pages; page++) {
1852 for (f = 0; f < ARRAY_SIZE(pmbus_fan_registers); f++) {
1855 if (!(info->func[page] & pmbus_fan_flags[f]))
1858 if (!pmbus_check_word_register(client, page,
1859 pmbus_fan_registers[f]))
1863 * Skip fan if not installed.
1864 * Each fan configuration register covers multiple fans,
1865 * so we have to do some magic.
1867 regval = _pmbus_read_byte_data(client, page,
1868 pmbus_fan_config_registers[f]);
1870 (!(regval & (PB_FAN_1_INSTALLED >> ((f & 1) * 4)))))
1873 if (pmbus_add_sensor(data, "fan", "input", index,
1874 page, pmbus_fan_registers[f],
1875 PSC_FAN, true, true, true) == NULL)
1879 if (pmbus_check_word_register(client, page,
1880 pmbus_fan_command_registers[f])) {
1881 ret = pmbus_add_fan_ctrl(client, data, index,
1888 * Each fan status register covers multiple fans,
1889 * so we have to do some magic.
1891 if ((info->func[page] & pmbus_fan_status_flags[f]) &&
1892 pmbus_check_byte_register(client,
1893 page, pmbus_fan_status_registers[f])) {
1896 if (f > 1) /* fan 3, 4 */
1897 base = PB_STATUS_FAN34_BASE + page;
1899 base = PB_STATUS_FAN_BASE + page;
1900 ret = pmbus_add_boolean(data, "fan",
1901 "alarm", index, NULL, NULL, base,
1902 PB_FAN_FAN1_WARNING >> (f & 1));
1905 ret = pmbus_add_boolean(data, "fan",
1906 "fault", index, NULL, NULL, base,
1907 PB_FAN_FAN1_FAULT >> (f & 1));
1917 struct pmbus_samples_attr {
1922 struct pmbus_samples_reg {
1924 struct pmbus_samples_attr *attr;
1925 struct device_attribute dev_attr;
1928 static struct pmbus_samples_attr pmbus_samples_registers[] = {
1930 .reg = PMBUS_VIRT_SAMPLES,
1933 .reg = PMBUS_VIRT_IN_SAMPLES,
1934 .name = "in_samples",
1936 .reg = PMBUS_VIRT_CURR_SAMPLES,
1937 .name = "curr_samples",
1939 .reg = PMBUS_VIRT_POWER_SAMPLES,
1940 .name = "power_samples",
1942 .reg = PMBUS_VIRT_TEMP_SAMPLES,
1943 .name = "temp_samples",
1947 #define to_samples_reg(x) container_of(x, struct pmbus_samples_reg, dev_attr)
1949 static ssize_t pmbus_show_samples(struct device *dev,
1950 struct device_attribute *devattr, char *buf)
1953 struct i2c_client *client = to_i2c_client(dev->parent);
1954 struct pmbus_samples_reg *reg = to_samples_reg(devattr);
1956 val = _pmbus_read_word_data(client, reg->page, reg->attr->reg);
1960 return snprintf(buf, PAGE_SIZE, "%d\n", val);
1963 static ssize_t pmbus_set_samples(struct device *dev,
1964 struct device_attribute *devattr,
1965 const char *buf, size_t count)
1969 struct i2c_client *client = to_i2c_client(dev->parent);
1970 struct pmbus_samples_reg *reg = to_samples_reg(devattr);
1971 struct pmbus_data *data = i2c_get_clientdata(client);
1973 if (kstrtol(buf, 0, &val) < 0)
1976 mutex_lock(&data->update_lock);
1977 ret = _pmbus_write_word_data(client, reg->page, reg->attr->reg, val);
1978 mutex_unlock(&data->update_lock);
1980 return ret ? : count;
1983 static int pmbus_add_samples_attr(struct pmbus_data *data, int page,
1984 struct pmbus_samples_attr *attr)
1986 struct pmbus_samples_reg *reg;
1988 reg = devm_kzalloc(data->dev, sizeof(*reg), GFP_KERNEL);
1995 pmbus_dev_attr_init(®->dev_attr, attr->name, 0644,
1996 pmbus_show_samples, pmbus_set_samples);
1998 return pmbus_add_attribute(data, ®->dev_attr.attr);
2001 static int pmbus_add_samples_attributes(struct i2c_client *client,
2002 struct pmbus_data *data)
2004 const struct pmbus_driver_info *info = data->info;
2007 if (!(info->func[0] & PMBUS_HAVE_SAMPLES))
2010 for (s = 0; s < ARRAY_SIZE(pmbus_samples_registers); s++) {
2011 struct pmbus_samples_attr *attr;
2014 attr = &pmbus_samples_registers[s];
2015 if (!pmbus_check_word_register(client, 0, attr->reg))
2018 ret = pmbus_add_samples_attr(data, 0, attr);
2026 static int pmbus_find_attributes(struct i2c_client *client,
2027 struct pmbus_data *data)
2031 /* Voltage sensors */
2032 ret = pmbus_add_sensor_attrs(client, data, "in", voltage_attributes,
2033 ARRAY_SIZE(voltage_attributes));
2037 /* Current sensors */
2038 ret = pmbus_add_sensor_attrs(client, data, "curr", current_attributes,
2039 ARRAY_SIZE(current_attributes));
2044 ret = pmbus_add_sensor_attrs(client, data, "power", power_attributes,
2045 ARRAY_SIZE(power_attributes));
2049 /* Temperature sensors */
2050 ret = pmbus_add_sensor_attrs(client, data, "temp", temp_attributes,
2051 ARRAY_SIZE(temp_attributes));
2056 ret = pmbus_add_fan_attributes(client, data);
2060 ret = pmbus_add_samples_attributes(client, data);
2065 * Identify chip parameters.
2066 * This function is called for all chips.
2068 static int pmbus_identify_common(struct i2c_client *client,
2069 struct pmbus_data *data, int page)
2073 if (pmbus_check_byte_register(client, page, PMBUS_VOUT_MODE))
2074 vout_mode = _pmbus_read_byte_data(client, page,
2076 if (vout_mode >= 0 && vout_mode != 0xff) {
2078 * Not all chips support the VOUT_MODE command,
2079 * so a failure to read it is not an error.
2081 switch (vout_mode >> 5) {
2082 case 0: /* linear mode */
2083 if (data->info->format[PSC_VOLTAGE_OUT] != linear)
2086 data->exponent[page] = ((s8)(vout_mode << 3)) >> 3;
2088 case 1: /* VID mode */
2089 if (data->info->format[PSC_VOLTAGE_OUT] != vid)
2092 case 2: /* direct mode */
2093 if (data->info->format[PSC_VOLTAGE_OUT] != direct)
2101 pmbus_clear_fault_page(client, page);
2105 static int pmbus_read_status_byte(struct i2c_client *client, int page)
2107 return _pmbus_read_byte_data(client, page, PMBUS_STATUS_BYTE);
2110 static int pmbus_read_status_word(struct i2c_client *client, int page)
2112 return _pmbus_read_word_data(client, page, PMBUS_STATUS_WORD);
2115 static int pmbus_init_common(struct i2c_client *client, struct pmbus_data *data,
2116 struct pmbus_driver_info *info)
2118 struct device *dev = &client->dev;
2122 * Some PMBus chips don't support PMBUS_STATUS_WORD, so try
2123 * to use PMBUS_STATUS_BYTE instead if that is the case.
2124 * Bail out if both registers are not supported.
2126 data->read_status = pmbus_read_status_word;
2127 ret = i2c_smbus_read_word_data(client, PMBUS_STATUS_WORD);
2128 if (ret < 0 || ret == 0xffff) {
2129 data->read_status = pmbus_read_status_byte;
2130 ret = i2c_smbus_read_byte_data(client, PMBUS_STATUS_BYTE);
2131 if (ret < 0 || ret == 0xff) {
2132 dev_err(dev, "PMBus status register not found\n");
2136 data->has_status_word = true;
2139 /* Enable PEC if the controller supports it */
2140 ret = i2c_smbus_read_byte_data(client, PMBUS_CAPABILITY);
2141 if (ret >= 0 && (ret & PB_CAPABILITY_ERROR_CHECK))
2142 client->flags |= I2C_CLIENT_PEC;
2144 if (data->info->pages)
2145 pmbus_clear_faults(client);
2147 pmbus_clear_fault_page(client, -1);
2149 if (info->identify) {
2150 ret = (*info->identify)(client, info);
2152 dev_err(dev, "Chip identification failed\n");
2157 if (info->pages <= 0 || info->pages > PMBUS_PAGES) {
2158 dev_err(dev, "Bad number of PMBus pages: %d\n", info->pages);
2162 for (page = 0; page < info->pages; page++) {
2163 ret = pmbus_identify_common(client, data, page);
2165 dev_err(dev, "Failed to identify chip capabilities\n");
2172 #if IS_ENABLED(CONFIG_REGULATOR)
2173 static int pmbus_regulator_is_enabled(struct regulator_dev *rdev)
2175 struct device *dev = rdev_get_dev(rdev);
2176 struct i2c_client *client = to_i2c_client(dev->parent);
2177 u8 page = rdev_get_id(rdev);
2180 ret = pmbus_read_byte_data(client, page, PMBUS_OPERATION);
2184 return !!(ret & PB_OPERATION_CONTROL_ON);
2187 static int _pmbus_regulator_on_off(struct regulator_dev *rdev, bool enable)
2189 struct device *dev = rdev_get_dev(rdev);
2190 struct i2c_client *client = to_i2c_client(dev->parent);
2191 u8 page = rdev_get_id(rdev);
2193 return pmbus_update_byte_data(client, page, PMBUS_OPERATION,
2194 PB_OPERATION_CONTROL_ON,
2195 enable ? PB_OPERATION_CONTROL_ON : 0);
2198 static int pmbus_regulator_enable(struct regulator_dev *rdev)
2200 return _pmbus_regulator_on_off(rdev, 1);
2203 static int pmbus_regulator_disable(struct regulator_dev *rdev)
2205 return _pmbus_regulator_on_off(rdev, 0);
2208 const struct regulator_ops pmbus_regulator_ops = {
2209 .enable = pmbus_regulator_enable,
2210 .disable = pmbus_regulator_disable,
2211 .is_enabled = pmbus_regulator_is_enabled,
2213 EXPORT_SYMBOL_GPL(pmbus_regulator_ops);
2215 static int pmbus_regulator_register(struct pmbus_data *data)
2217 struct device *dev = data->dev;
2218 const struct pmbus_driver_info *info = data->info;
2219 const struct pmbus_platform_data *pdata = dev_get_platdata(dev);
2220 struct regulator_dev *rdev;
2223 for (i = 0; i < info->num_regulators; i++) {
2224 struct regulator_config config = { };
2227 config.driver_data = data;
2229 if (pdata && pdata->reg_init_data)
2230 config.init_data = &pdata->reg_init_data[i];
2232 rdev = devm_regulator_register(dev, &info->reg_desc[i],
2235 dev_err(dev, "Failed to register %s regulator\n",
2236 info->reg_desc[i].name);
2237 return PTR_ERR(rdev);
2244 static int pmbus_regulator_register(struct pmbus_data *data)
2250 static struct dentry *pmbus_debugfs_dir; /* pmbus debugfs directory */
2252 #if IS_ENABLED(CONFIG_DEBUG_FS)
2253 static int pmbus_debugfs_get(void *data, u64 *val)
2256 struct pmbus_debugfs_entry *entry = data;
2258 rc = _pmbus_read_byte_data(entry->client, entry->page, entry->reg);
2266 DEFINE_DEBUGFS_ATTRIBUTE(pmbus_debugfs_ops, pmbus_debugfs_get, NULL,
2269 static int pmbus_debugfs_get_status(void *data, u64 *val)
2272 struct pmbus_debugfs_entry *entry = data;
2273 struct pmbus_data *pdata = i2c_get_clientdata(entry->client);
2275 rc = pdata->read_status(entry->client, entry->page);
2283 DEFINE_DEBUGFS_ATTRIBUTE(pmbus_debugfs_ops_status, pmbus_debugfs_get_status,
2284 NULL, "0x%04llx\n");
2286 static int pmbus_init_debugfs(struct i2c_client *client,
2287 struct pmbus_data *data)
2290 char name[PMBUS_NAME_SIZE];
2291 struct pmbus_debugfs_entry *entries;
2293 if (!pmbus_debugfs_dir)
2297 * Create the debugfs directory for this device. Use the hwmon device
2298 * name to avoid conflicts (hwmon numbers are globally unique).
2300 data->debugfs = debugfs_create_dir(dev_name(data->hwmon_dev),
2302 if (IS_ERR_OR_NULL(data->debugfs)) {
2303 data->debugfs = NULL;
2307 /* Allocate the max possible entries we need. */
2308 entries = devm_kcalloc(data->dev,
2309 data->info->pages * 10, sizeof(*entries),
2314 for (i = 0; i < data->info->pages; ++i) {
2315 /* Check accessibility of status register if it's not page 0 */
2316 if (!i || pmbus_check_status_register(client, i)) {
2317 /* No need to set reg as we have special read op. */
2318 entries[idx].client = client;
2319 entries[idx].page = i;
2320 scnprintf(name, PMBUS_NAME_SIZE, "status%d", i);
2321 debugfs_create_file(name, 0444, data->debugfs,
2323 &pmbus_debugfs_ops_status);
2326 if (data->info->func[i] & PMBUS_HAVE_STATUS_VOUT) {
2327 entries[idx].client = client;
2328 entries[idx].page = i;
2329 entries[idx].reg = PMBUS_STATUS_VOUT;
2330 scnprintf(name, PMBUS_NAME_SIZE, "status%d_vout", i);
2331 debugfs_create_file(name, 0444, data->debugfs,
2333 &pmbus_debugfs_ops);
2336 if (data->info->func[i] & PMBUS_HAVE_STATUS_IOUT) {
2337 entries[idx].client = client;
2338 entries[idx].page = i;
2339 entries[idx].reg = PMBUS_STATUS_IOUT;
2340 scnprintf(name, PMBUS_NAME_SIZE, "status%d_iout", i);
2341 debugfs_create_file(name, 0444, data->debugfs,
2343 &pmbus_debugfs_ops);
2346 if (data->info->func[i] & PMBUS_HAVE_STATUS_INPUT) {
2347 entries[idx].client = client;
2348 entries[idx].page = i;
2349 entries[idx].reg = PMBUS_STATUS_INPUT;
2350 scnprintf(name, PMBUS_NAME_SIZE, "status%d_input", i);
2351 debugfs_create_file(name, 0444, data->debugfs,
2353 &pmbus_debugfs_ops);
2356 if (data->info->func[i] & PMBUS_HAVE_STATUS_TEMP) {
2357 entries[idx].client = client;
2358 entries[idx].page = i;
2359 entries[idx].reg = PMBUS_STATUS_TEMPERATURE;
2360 scnprintf(name, PMBUS_NAME_SIZE, "status%d_temp", i);
2361 debugfs_create_file(name, 0444, data->debugfs,
2363 &pmbus_debugfs_ops);
2366 if (pmbus_check_byte_register(client, i, PMBUS_STATUS_CML)) {
2367 entries[idx].client = client;
2368 entries[idx].page = i;
2369 entries[idx].reg = PMBUS_STATUS_CML;
2370 scnprintf(name, PMBUS_NAME_SIZE, "status%d_cml", i);
2371 debugfs_create_file(name, 0444, data->debugfs,
2373 &pmbus_debugfs_ops);
2376 if (pmbus_check_byte_register(client, i, PMBUS_STATUS_OTHER)) {
2377 entries[idx].client = client;
2378 entries[idx].page = i;
2379 entries[idx].reg = PMBUS_STATUS_OTHER;
2380 scnprintf(name, PMBUS_NAME_SIZE, "status%d_other", i);
2381 debugfs_create_file(name, 0444, data->debugfs,
2383 &pmbus_debugfs_ops);
2386 if (pmbus_check_byte_register(client, i,
2387 PMBUS_STATUS_MFR_SPECIFIC)) {
2388 entries[idx].client = client;
2389 entries[idx].page = i;
2390 entries[idx].reg = PMBUS_STATUS_MFR_SPECIFIC;
2391 scnprintf(name, PMBUS_NAME_SIZE, "status%d_mfr", i);
2392 debugfs_create_file(name, 0444, data->debugfs,
2394 &pmbus_debugfs_ops);
2397 if (data->info->func[i] & PMBUS_HAVE_STATUS_FAN12) {
2398 entries[idx].client = client;
2399 entries[idx].page = i;
2400 entries[idx].reg = PMBUS_STATUS_FAN_12;
2401 scnprintf(name, PMBUS_NAME_SIZE, "status%d_fan12", i);
2402 debugfs_create_file(name, 0444, data->debugfs,
2404 &pmbus_debugfs_ops);
2407 if (data->info->func[i] & PMBUS_HAVE_STATUS_FAN34) {
2408 entries[idx].client = client;
2409 entries[idx].page = i;
2410 entries[idx].reg = PMBUS_STATUS_FAN_34;
2411 scnprintf(name, PMBUS_NAME_SIZE, "status%d_fan34", i);
2412 debugfs_create_file(name, 0444, data->debugfs,
2414 &pmbus_debugfs_ops);
2421 static int pmbus_init_debugfs(struct i2c_client *client,
2422 struct pmbus_data *data)
2426 #endif /* IS_ENABLED(CONFIG_DEBUG_FS) */
2428 int pmbus_do_probe(struct i2c_client *client, const struct i2c_device_id *id,
2429 struct pmbus_driver_info *info)
2431 struct device *dev = &client->dev;
2432 const struct pmbus_platform_data *pdata = dev_get_platdata(dev);
2433 struct pmbus_data *data;
2434 size_t groups_num = 0;
2440 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE
2441 | I2C_FUNC_SMBUS_BYTE_DATA
2442 | I2C_FUNC_SMBUS_WORD_DATA))
2445 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
2450 while (info->groups[groups_num])
2453 data->groups = devm_kcalloc(dev, groups_num + 2, sizeof(void *),
2458 i2c_set_clientdata(client, data);
2459 mutex_init(&data->update_lock);
2463 data->flags = pdata->flags;
2466 ret = pmbus_init_common(client, data, info);
2470 ret = pmbus_find_attributes(client, data);
2475 * If there are no attributes, something is wrong.
2476 * Bail out instead of trying to register nothing.
2478 if (!data->num_attributes) {
2479 dev_err(dev, "No attributes found\n");
2484 data->groups[0] = &data->group;
2485 memcpy(data->groups + 1, info->groups, sizeof(void *) * groups_num);
2486 data->hwmon_dev = hwmon_device_register_with_groups(dev, client->name,
2487 data, data->groups);
2488 if (IS_ERR(data->hwmon_dev)) {
2489 ret = PTR_ERR(data->hwmon_dev);
2490 dev_err(dev, "Failed to register hwmon device\n");
2494 ret = pmbus_regulator_register(data);
2496 goto out_unregister;
2498 ret = pmbus_init_debugfs(client, data);
2500 dev_warn(dev, "Failed to register debugfs\n");
2505 hwmon_device_unregister(data->hwmon_dev);
2507 kfree(data->group.attrs);
2510 EXPORT_SYMBOL_GPL(pmbus_do_probe);
2512 int pmbus_do_remove(struct i2c_client *client)
2514 struct pmbus_data *data = i2c_get_clientdata(client);
2516 debugfs_remove_recursive(data->debugfs);
2518 hwmon_device_unregister(data->hwmon_dev);
2519 kfree(data->group.attrs);
2522 EXPORT_SYMBOL_GPL(pmbus_do_remove);
2524 struct dentry *pmbus_get_debugfs_dir(struct i2c_client *client)
2526 struct pmbus_data *data = i2c_get_clientdata(client);
2528 return data->debugfs;
2530 EXPORT_SYMBOL_GPL(pmbus_get_debugfs_dir);
2532 static int __init pmbus_core_init(void)
2534 pmbus_debugfs_dir = debugfs_create_dir("pmbus", NULL);
2535 if (IS_ERR(pmbus_debugfs_dir))
2536 pmbus_debugfs_dir = NULL;
2541 static void __exit pmbus_core_exit(void)
2543 debugfs_remove_recursive(pmbus_debugfs_dir);
2546 module_init(pmbus_core_init);
2547 module_exit(pmbus_core_exit);
2549 MODULE_AUTHOR("Guenter Roeck");
2550 MODULE_DESCRIPTION("PMBus core driver");
2551 MODULE_LICENSE("GPL");