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/pmbus.h>
20 #include <linux/regulator/driver.h>
21 #include <linux/regulator/machine.h>
25 * Number of additional attribute pointers to allocate
26 * with each call to krealloc
28 #define PMBUS_ATTR_ALLOC_SIZE 32
29 #define PMBUS_NAME_SIZE 24
32 struct pmbus_sensor *next;
33 char name[PMBUS_NAME_SIZE]; /* sysfs sensor name */
34 struct device_attribute attribute;
35 u8 page; /* page number */
36 u8 phase; /* phase number, 0xff for all phases */
37 u16 reg; /* register */
38 enum pmbus_sensor_classes class; /* sensor class */
39 bool update; /* runtime sensor update needed */
40 bool convert; /* Whether or not to apply linear/vid/direct */
41 int data; /* Sensor data.
42 Negative if there was a read error */
44 #define to_pmbus_sensor(_attr) \
45 container_of(_attr, struct pmbus_sensor, attribute)
47 struct pmbus_boolean {
48 char name[PMBUS_NAME_SIZE]; /* sysfs boolean name */
49 struct sensor_device_attribute attribute;
50 struct pmbus_sensor *s1;
51 struct pmbus_sensor *s2;
53 #define to_pmbus_boolean(_attr) \
54 container_of(_attr, struct pmbus_boolean, attribute)
57 char name[PMBUS_NAME_SIZE]; /* sysfs label name */
58 struct device_attribute attribute;
59 char label[PMBUS_NAME_SIZE]; /* label */
61 #define to_pmbus_label(_attr) \
62 container_of(_attr, struct pmbus_label, attribute)
64 /* Macros for converting between sensor index and register/page/status mask */
66 #define PB_STATUS_MASK 0xffff
67 #define PB_REG_SHIFT 16
68 #define PB_REG_MASK 0x3ff
69 #define PB_PAGE_SHIFT 26
70 #define PB_PAGE_MASK 0x3f
72 #define pb_reg_to_index(page, reg, mask) (((page) << PB_PAGE_SHIFT) | \
73 ((reg) << PB_REG_SHIFT) | (mask))
75 #define pb_index_to_page(index) (((index) >> PB_PAGE_SHIFT) & PB_PAGE_MASK)
76 #define pb_index_to_reg(index) (((index) >> PB_REG_SHIFT) & PB_REG_MASK)
77 #define pb_index_to_mask(index) ((index) & PB_STATUS_MASK)
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 bool has_status_word; /* device uses STATUS_WORD register */
101 int (*read_status)(struct i2c_client *client, int page);
103 s16 currpage; /* current page, -1 for unknown/unset */
104 s16 currphase; /* current phase, 0xff for all, -1 for unknown/unset */
107 struct pmbus_debugfs_entry {
108 struct i2c_client *client;
113 static const int pmbus_fan_rpm_mask[] = {
120 static const int pmbus_fan_config_registers[] = {
127 static const int pmbus_fan_command_registers[] = {
134 void pmbus_clear_cache(struct i2c_client *client)
136 struct pmbus_data *data = i2c_get_clientdata(client);
137 struct pmbus_sensor *sensor;
139 for (sensor = data->sensors; sensor; sensor = sensor->next)
140 sensor->data = -ENODATA;
142 EXPORT_SYMBOL_NS_GPL(pmbus_clear_cache, PMBUS);
144 void pmbus_set_update(struct i2c_client *client, u8 reg, bool update)
146 struct pmbus_data *data = i2c_get_clientdata(client);
147 struct pmbus_sensor *sensor;
149 for (sensor = data->sensors; sensor; sensor = sensor->next)
150 if (sensor->reg == reg)
151 sensor->update = update;
153 EXPORT_SYMBOL_NS_GPL(pmbus_set_update, PMBUS);
155 int pmbus_set_page(struct i2c_client *client, int page, int phase)
157 struct pmbus_data *data = i2c_get_clientdata(client);
163 if (!(data->info->func[page] & PMBUS_PAGE_VIRTUAL) &&
164 data->info->pages > 1 && page != data->currpage) {
165 rv = i2c_smbus_write_byte_data(client, PMBUS_PAGE, page);
169 rv = i2c_smbus_read_byte_data(client, PMBUS_PAGE);
176 data->currpage = page;
178 if (data->info->phases[page] && data->currphase != phase &&
179 !(data->info->func[page] & PMBUS_PHASE_VIRTUAL)) {
180 rv = i2c_smbus_write_byte_data(client, PMBUS_PHASE,
185 data->currphase = phase;
189 EXPORT_SYMBOL_NS_GPL(pmbus_set_page, PMBUS);
191 int pmbus_write_byte(struct i2c_client *client, int page, u8 value)
195 rv = pmbus_set_page(client, page, 0xff);
199 return i2c_smbus_write_byte(client, value);
201 EXPORT_SYMBOL_NS_GPL(pmbus_write_byte, PMBUS);
204 * _pmbus_write_byte() is similar to pmbus_write_byte(), but checks if
205 * a device specific mapping function exists and calls it if necessary.
207 static int _pmbus_write_byte(struct i2c_client *client, int page, u8 value)
209 struct pmbus_data *data = i2c_get_clientdata(client);
210 const struct pmbus_driver_info *info = data->info;
213 if (info->write_byte) {
214 status = info->write_byte(client, page, value);
215 if (status != -ENODATA)
218 return pmbus_write_byte(client, page, value);
221 int pmbus_write_word_data(struct i2c_client *client, int page, u8 reg,
226 rv = pmbus_set_page(client, page, 0xff);
230 return i2c_smbus_write_word_data(client, reg, word);
232 EXPORT_SYMBOL_NS_GPL(pmbus_write_word_data, PMBUS);
235 static int pmbus_write_virt_reg(struct i2c_client *client, int page, int reg,
243 case PMBUS_VIRT_FAN_TARGET_1 ... PMBUS_VIRT_FAN_TARGET_4:
244 id = reg - PMBUS_VIRT_FAN_TARGET_1;
245 bit = pmbus_fan_rpm_mask[id];
246 rv = pmbus_update_fan(client, page, id, bit, bit, word);
257 * _pmbus_write_word_data() is similar to pmbus_write_word_data(), but checks if
258 * a device specific mapping function exists and calls it if necessary.
260 static int _pmbus_write_word_data(struct i2c_client *client, int page, int reg,
263 struct pmbus_data *data = i2c_get_clientdata(client);
264 const struct pmbus_driver_info *info = data->info;
267 if (info->write_word_data) {
268 status = info->write_word_data(client, page, reg, word);
269 if (status != -ENODATA)
273 if (reg >= PMBUS_VIRT_BASE)
274 return pmbus_write_virt_reg(client, page, reg, word);
276 return pmbus_write_word_data(client, page, reg, word);
279 int pmbus_update_fan(struct i2c_client *client, int page, int id,
280 u8 config, u8 mask, u16 command)
286 from = pmbus_read_byte_data(client, page,
287 pmbus_fan_config_registers[id]);
291 to = (from & ~mask) | (config & mask);
293 rv = pmbus_write_byte_data(client, page,
294 pmbus_fan_config_registers[id], to);
299 return _pmbus_write_word_data(client, page,
300 pmbus_fan_command_registers[id], command);
302 EXPORT_SYMBOL_NS_GPL(pmbus_update_fan, PMBUS);
304 int pmbus_read_word_data(struct i2c_client *client, int page, int phase, u8 reg)
308 rv = pmbus_set_page(client, page, phase);
312 return i2c_smbus_read_word_data(client, reg);
314 EXPORT_SYMBOL_NS_GPL(pmbus_read_word_data, PMBUS);
316 static int pmbus_read_virt_reg(struct i2c_client *client, int page, int reg)
322 case PMBUS_VIRT_FAN_TARGET_1 ... PMBUS_VIRT_FAN_TARGET_4:
323 id = reg - PMBUS_VIRT_FAN_TARGET_1;
324 rv = pmbus_get_fan_rate_device(client, page, id, rpm);
335 * _pmbus_read_word_data() is similar to pmbus_read_word_data(), but checks if
336 * a device specific mapping function exists and calls it if necessary.
338 static int _pmbus_read_word_data(struct i2c_client *client, int page,
341 struct pmbus_data *data = i2c_get_clientdata(client);
342 const struct pmbus_driver_info *info = data->info;
345 if (info->read_word_data) {
346 status = info->read_word_data(client, page, phase, reg);
347 if (status != -ENODATA)
351 if (reg >= PMBUS_VIRT_BASE)
352 return pmbus_read_virt_reg(client, page, reg);
354 return pmbus_read_word_data(client, page, phase, reg);
357 /* Same as above, but without phase parameter, for use in check functions */
358 static int __pmbus_read_word_data(struct i2c_client *client, int page, int reg)
360 return _pmbus_read_word_data(client, page, 0xff, reg);
363 int pmbus_read_byte_data(struct i2c_client *client, int page, u8 reg)
367 rv = pmbus_set_page(client, page, 0xff);
371 return i2c_smbus_read_byte_data(client, reg);
373 EXPORT_SYMBOL_NS_GPL(pmbus_read_byte_data, PMBUS);
375 int pmbus_write_byte_data(struct i2c_client *client, int page, u8 reg, u8 value)
379 rv = pmbus_set_page(client, page, 0xff);
383 return i2c_smbus_write_byte_data(client, reg, value);
385 EXPORT_SYMBOL_NS_GPL(pmbus_write_byte_data, PMBUS);
387 int pmbus_update_byte_data(struct i2c_client *client, int page, u8 reg,
393 rv = pmbus_read_byte_data(client, page, reg);
397 tmp = (rv & ~mask) | (value & mask);
400 rv = pmbus_write_byte_data(client, page, reg, tmp);
404 EXPORT_SYMBOL_NS_GPL(pmbus_update_byte_data, PMBUS);
407 * _pmbus_read_byte_data() is similar to pmbus_read_byte_data(), but checks if
408 * a device specific mapping function exists and calls it if necessary.
410 static int _pmbus_read_byte_data(struct i2c_client *client, int page, int reg)
412 struct pmbus_data *data = i2c_get_clientdata(client);
413 const struct pmbus_driver_info *info = data->info;
416 if (info->read_byte_data) {
417 status = info->read_byte_data(client, page, reg);
418 if (status != -ENODATA)
421 return pmbus_read_byte_data(client, page, reg);
424 static struct pmbus_sensor *pmbus_find_sensor(struct pmbus_data *data, int page,
427 struct pmbus_sensor *sensor;
429 for (sensor = data->sensors; sensor; sensor = sensor->next) {
430 if (sensor->page == page && sensor->reg == reg)
434 return ERR_PTR(-EINVAL);
437 static int pmbus_get_fan_rate(struct i2c_client *client, int page, int id,
438 enum pmbus_fan_mode mode,
441 struct pmbus_data *data = i2c_get_clientdata(client);
442 bool want_rpm, have_rpm;
443 struct pmbus_sensor *s;
447 want_rpm = (mode == rpm);
450 reg = want_rpm ? PMBUS_VIRT_FAN_TARGET_1 : PMBUS_VIRT_PWM_1;
451 s = pmbus_find_sensor(data, page, reg + id);
458 config = pmbus_read_byte_data(client, page,
459 pmbus_fan_config_registers[id]);
463 have_rpm = !!(config & pmbus_fan_rpm_mask[id]);
464 if (want_rpm == have_rpm)
465 return pmbus_read_word_data(client, page, 0xff,
466 pmbus_fan_command_registers[id]);
468 /* Can't sensibly map between RPM and PWM, just return zero */
472 int pmbus_get_fan_rate_device(struct i2c_client *client, int page, int id,
473 enum pmbus_fan_mode mode)
475 return pmbus_get_fan_rate(client, page, id, mode, false);
477 EXPORT_SYMBOL_NS_GPL(pmbus_get_fan_rate_device, PMBUS);
479 int pmbus_get_fan_rate_cached(struct i2c_client *client, int page, int id,
480 enum pmbus_fan_mode mode)
482 return pmbus_get_fan_rate(client, page, id, mode, true);
484 EXPORT_SYMBOL_NS_GPL(pmbus_get_fan_rate_cached, PMBUS);
486 static void pmbus_clear_fault_page(struct i2c_client *client, int page)
488 _pmbus_write_byte(client, page, PMBUS_CLEAR_FAULTS);
491 void pmbus_clear_faults(struct i2c_client *client)
493 struct pmbus_data *data = i2c_get_clientdata(client);
496 for (i = 0; i < data->info->pages; i++)
497 pmbus_clear_fault_page(client, i);
499 EXPORT_SYMBOL_NS_GPL(pmbus_clear_faults, PMBUS);
501 static int pmbus_check_status_cml(struct i2c_client *client)
503 struct pmbus_data *data = i2c_get_clientdata(client);
506 status = data->read_status(client, -1);
507 if (status < 0 || (status & PB_STATUS_CML)) {
508 status2 = _pmbus_read_byte_data(client, -1, PMBUS_STATUS_CML);
509 if (status2 < 0 || (status2 & PB_CML_FAULT_INVALID_COMMAND))
515 static bool pmbus_check_register(struct i2c_client *client,
516 int (*func)(struct i2c_client *client,
521 struct pmbus_data *data = i2c_get_clientdata(client);
523 rv = func(client, page, reg);
524 if (rv >= 0 && !(data->flags & PMBUS_SKIP_STATUS_CHECK))
525 rv = pmbus_check_status_cml(client);
526 pmbus_clear_fault_page(client, -1);
530 static bool pmbus_check_status_register(struct i2c_client *client, int page)
533 struct pmbus_data *data = i2c_get_clientdata(client);
535 status = data->read_status(client, page);
536 if (status >= 0 && !(data->flags & PMBUS_SKIP_STATUS_CHECK) &&
537 (status & PB_STATUS_CML)) {
538 status = _pmbus_read_byte_data(client, -1, PMBUS_STATUS_CML);
539 if (status < 0 || (status & PB_CML_FAULT_INVALID_COMMAND))
543 pmbus_clear_fault_page(client, -1);
547 bool pmbus_check_byte_register(struct i2c_client *client, int page, int reg)
549 return pmbus_check_register(client, _pmbus_read_byte_data, page, reg);
551 EXPORT_SYMBOL_NS_GPL(pmbus_check_byte_register, PMBUS);
553 bool pmbus_check_word_register(struct i2c_client *client, int page, int reg)
555 return pmbus_check_register(client, __pmbus_read_word_data, page, reg);
557 EXPORT_SYMBOL_NS_GPL(pmbus_check_word_register, PMBUS);
559 const struct pmbus_driver_info *pmbus_get_driver_info(struct i2c_client *client)
561 struct pmbus_data *data = i2c_get_clientdata(client);
565 EXPORT_SYMBOL_NS_GPL(pmbus_get_driver_info, PMBUS);
567 static int pmbus_get_status(struct i2c_client *client, int page, int reg)
569 struct pmbus_data *data = i2c_get_clientdata(client);
573 case PMBUS_STATUS_WORD:
574 status = data->read_status(client, page);
577 status = _pmbus_read_byte_data(client, page, reg);
581 pmbus_clear_faults(client);
585 static void pmbus_update_sensor_data(struct i2c_client *client, struct pmbus_sensor *sensor)
587 if (sensor->data < 0 || sensor->update)
588 sensor->data = _pmbus_read_word_data(client, sensor->page,
589 sensor->phase, sensor->reg);
593 * Convert linear sensor values to milli- or micro-units
594 * depending on sensor type.
596 static s64 pmbus_reg2data_linear(struct pmbus_data *data,
597 struct pmbus_sensor *sensor)
603 if (sensor->class == PSC_VOLTAGE_OUT) { /* LINEAR16 */
604 exponent = data->exponent[sensor->page];
605 mantissa = (u16) sensor->data;
606 } else { /* LINEAR11 */
607 exponent = ((s16)sensor->data) >> 11;
608 mantissa = ((s16)((sensor->data & 0x7ff) << 5)) >> 5;
613 /* scale result to milli-units for all sensors except fans */
614 if (sensor->class != PSC_FAN)
617 /* scale result to micro-units for power sensors */
618 if (sensor->class == PSC_POWER)
630 * Convert direct sensor values to milli- or micro-units
631 * depending on sensor type.
633 static s64 pmbus_reg2data_direct(struct pmbus_data *data,
634 struct pmbus_sensor *sensor)
636 s64 b, val = (s16)sensor->data;
639 m = data->info->m[sensor->class];
640 b = data->info->b[sensor->class];
641 R = data->info->R[sensor->class];
646 /* X = 1/m * (Y * 10^-R - b) */
648 /* scale result to milli-units for everything but fans */
649 if (!(sensor->class == PSC_FAN || sensor->class == PSC_PWM)) {
654 /* scale result to micro-units for power sensors */
655 if (sensor->class == PSC_POWER) {
665 val = div_s64(val + 5LL, 10L); /* round closest */
669 val = div_s64(val - b, m);
674 * Convert VID sensor values to milli- or micro-units
675 * depending on sensor type.
677 static s64 pmbus_reg2data_vid(struct pmbus_data *data,
678 struct pmbus_sensor *sensor)
680 long val = sensor->data;
683 switch (data->info->vrm_version[sensor->page]) {
685 if (val >= 0x02 && val <= 0xb2)
686 rv = DIV_ROUND_CLOSEST(160000 - (val - 2) * 625, 100);
690 rv = 250 + (val - 1) * 5;
694 rv = 500 + (val - 1) * 10;
698 rv = 200 + (val - 1) * 10;
701 if (val >= 0x0 && val <= 0xd8)
702 rv = DIV_ROUND_CLOSEST(155000 - val * 625, 100);
708 static s64 pmbus_reg2data(struct pmbus_data *data, struct pmbus_sensor *sensor)
712 if (!sensor->convert)
715 switch (data->info->format[sensor->class]) {
717 val = pmbus_reg2data_direct(data, sensor);
720 val = pmbus_reg2data_vid(data, sensor);
724 val = pmbus_reg2data_linear(data, sensor);
730 #define MAX_MANTISSA (1023 * 1000)
731 #define MIN_MANTISSA (511 * 1000)
733 static u16 pmbus_data2reg_linear(struct pmbus_data *data,
734 struct pmbus_sensor *sensor, s64 val)
736 s16 exponent = 0, mantissa;
737 bool negative = false;
743 if (sensor->class == PSC_VOLTAGE_OUT) {
744 /* LINEAR16 does not support negative voltages */
749 * For a static exponents, we don't have a choice
750 * but to adjust the value to it.
752 if (data->exponent[sensor->page] < 0)
753 val <<= -data->exponent[sensor->page];
755 val >>= data->exponent[sensor->page];
756 val = DIV_ROUND_CLOSEST_ULL(val, 1000);
757 return clamp_val(val, 0, 0xffff);
765 /* Power is in uW. Convert to mW before converting. */
766 if (sensor->class == PSC_POWER)
767 val = DIV_ROUND_CLOSEST_ULL(val, 1000);
770 * For simplicity, convert fan data to milli-units
771 * before calculating the exponent.
773 if (sensor->class == PSC_FAN)
776 /* Reduce large mantissa until it fits into 10 bit */
777 while (val >= MAX_MANTISSA && exponent < 15) {
781 /* Increase small mantissa to improve precision */
782 while (val < MIN_MANTISSA && exponent > -15) {
787 /* Convert mantissa from milli-units to units */
788 mantissa = clamp_val(DIV_ROUND_CLOSEST_ULL(val, 1000), 0, 0x3ff);
792 mantissa = -mantissa;
794 /* Convert to 5 bit exponent, 11 bit mantissa */
795 return (mantissa & 0x7ff) | ((exponent << 11) & 0xf800);
798 static u16 pmbus_data2reg_direct(struct pmbus_data *data,
799 struct pmbus_sensor *sensor, s64 val)
804 m = data->info->m[sensor->class];
805 b = data->info->b[sensor->class];
806 R = data->info->R[sensor->class];
808 /* Power is in uW. Adjust R and b. */
809 if (sensor->class == PSC_POWER) {
814 /* Calculate Y = (m * X + b) * 10^R */
815 if (!(sensor->class == PSC_FAN || sensor->class == PSC_PWM)) {
816 R -= 3; /* Adjust R and b for data in milli-units */
826 val = div_s64(val + 5LL, 10L); /* round closest */
830 return (u16)clamp_val(val, S16_MIN, S16_MAX);
833 static u16 pmbus_data2reg_vid(struct pmbus_data *data,
834 struct pmbus_sensor *sensor, s64 val)
836 val = clamp_val(val, 500, 1600);
838 return 2 + DIV_ROUND_CLOSEST_ULL((1600LL - val) * 100LL, 625);
841 static u16 pmbus_data2reg(struct pmbus_data *data,
842 struct pmbus_sensor *sensor, s64 val)
846 if (!sensor->convert)
849 switch (data->info->format[sensor->class]) {
851 regval = pmbus_data2reg_direct(data, sensor, val);
854 regval = pmbus_data2reg_vid(data, sensor, val);
858 regval = pmbus_data2reg_linear(data, sensor, val);
865 * Return boolean calculated from converted data.
866 * <index> defines a status register index and mask.
867 * The mask is in the lower 8 bits, the register index is in bits 8..23.
869 * The associated pmbus_boolean structure contains optional pointers to two
870 * sensor attributes. If specified, those attributes are compared against each
871 * other to determine if a limit has been exceeded.
873 * If the sensor attribute pointers are NULL, the function returns true if
874 * (status[reg] & mask) is true.
876 * If sensor attribute pointers are provided, a comparison against a specified
877 * limit has to be performed to determine the boolean result.
878 * In this case, the function returns true if v1 >= v2 (where v1 and v2 are
879 * sensor values referenced by sensor attribute pointers s1 and s2).
881 * To determine if an object exceeds upper limits, specify <s1,s2> = <v,limit>.
882 * To determine if an object exceeds lower limits, specify <s1,s2> = <limit,v>.
884 * If a negative value is stored in any of the referenced registers, this value
885 * reflects an error code which will be returned.
887 static int pmbus_get_boolean(struct i2c_client *client, struct pmbus_boolean *b,
890 struct pmbus_data *data = i2c_get_clientdata(client);
891 struct pmbus_sensor *s1 = b->s1;
892 struct pmbus_sensor *s2 = b->s2;
893 u16 mask = pb_index_to_mask(index);
894 u8 page = pb_index_to_page(index);
895 u16 reg = pb_index_to_reg(index);
899 mutex_lock(&data->update_lock);
900 status = pmbus_get_status(client, page, reg);
907 pmbus_update_sensor_data(client, s1);
909 pmbus_update_sensor_data(client, s2);
911 regval = status & mask;
924 v1 = pmbus_reg2data(data, s1);
925 v2 = pmbus_reg2data(data, s2);
926 ret = !!(regval && v1 >= v2);
931 mutex_unlock(&data->update_lock);
935 static ssize_t pmbus_show_boolean(struct device *dev,
936 struct device_attribute *da, char *buf)
938 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
939 struct pmbus_boolean *boolean = to_pmbus_boolean(attr);
940 struct i2c_client *client = to_i2c_client(dev->parent);
943 val = pmbus_get_boolean(client, boolean, attr->index);
946 return sysfs_emit(buf, "%d\n", val);
949 static ssize_t pmbus_show_sensor(struct device *dev,
950 struct device_attribute *devattr, char *buf)
952 struct i2c_client *client = to_i2c_client(dev->parent);
953 struct pmbus_sensor *sensor = to_pmbus_sensor(devattr);
954 struct pmbus_data *data = i2c_get_clientdata(client);
957 mutex_lock(&data->update_lock);
958 pmbus_update_sensor_data(client, sensor);
959 if (sensor->data < 0)
962 ret = sysfs_emit(buf, "%lld\n", pmbus_reg2data(data, sensor));
963 mutex_unlock(&data->update_lock);
967 static ssize_t pmbus_set_sensor(struct device *dev,
968 struct device_attribute *devattr,
969 const char *buf, size_t count)
971 struct i2c_client *client = to_i2c_client(dev->parent);
972 struct pmbus_data *data = i2c_get_clientdata(client);
973 struct pmbus_sensor *sensor = to_pmbus_sensor(devattr);
979 if (kstrtos64(buf, 10, &val) < 0)
982 mutex_lock(&data->update_lock);
983 regval = pmbus_data2reg(data, sensor, val);
984 ret = _pmbus_write_word_data(client, sensor->page, sensor->reg, regval);
988 sensor->data = -ENODATA;
989 mutex_unlock(&data->update_lock);
993 static ssize_t pmbus_show_label(struct device *dev,
994 struct device_attribute *da, char *buf)
996 struct pmbus_label *label = to_pmbus_label(da);
998 return sysfs_emit(buf, "%s\n", label->label);
1001 static int pmbus_add_attribute(struct pmbus_data *data, struct attribute *attr)
1003 if (data->num_attributes >= data->max_attributes - 1) {
1004 int new_max_attrs = data->max_attributes + PMBUS_ATTR_ALLOC_SIZE;
1005 void *new_attrs = devm_krealloc(data->dev, data->group.attrs,
1006 new_max_attrs * sizeof(void *),
1010 data->group.attrs = new_attrs;
1011 data->max_attributes = new_max_attrs;
1014 data->group.attrs[data->num_attributes++] = attr;
1015 data->group.attrs[data->num_attributes] = NULL;
1019 static void pmbus_dev_attr_init(struct device_attribute *dev_attr,
1022 ssize_t (*show)(struct device *dev,
1023 struct device_attribute *attr,
1025 ssize_t (*store)(struct device *dev,
1026 struct device_attribute *attr,
1027 const char *buf, size_t count))
1029 sysfs_attr_init(&dev_attr->attr);
1030 dev_attr->attr.name = name;
1031 dev_attr->attr.mode = mode;
1032 dev_attr->show = show;
1033 dev_attr->store = store;
1036 static void pmbus_attr_init(struct sensor_device_attribute *a,
1039 ssize_t (*show)(struct device *dev,
1040 struct device_attribute *attr,
1042 ssize_t (*store)(struct device *dev,
1043 struct device_attribute *attr,
1044 const char *buf, size_t count),
1047 pmbus_dev_attr_init(&a->dev_attr, name, mode, show, store);
1051 static int pmbus_add_boolean(struct pmbus_data *data,
1052 const char *name, const char *type, int seq,
1053 struct pmbus_sensor *s1,
1054 struct pmbus_sensor *s2,
1055 u8 page, u16 reg, u16 mask)
1057 struct pmbus_boolean *boolean;
1058 struct sensor_device_attribute *a;
1060 if (WARN((s1 && !s2) || (!s1 && s2), "Bad s1/s2 parameters\n"))
1063 boolean = devm_kzalloc(data->dev, sizeof(*boolean), GFP_KERNEL);
1067 a = &boolean->attribute;
1069 snprintf(boolean->name, sizeof(boolean->name), "%s%d_%s",
1073 pmbus_attr_init(a, boolean->name, 0444, pmbus_show_boolean, NULL,
1074 pb_reg_to_index(page, reg, mask));
1076 return pmbus_add_attribute(data, &a->dev_attr.attr);
1079 static struct pmbus_sensor *pmbus_add_sensor(struct pmbus_data *data,
1080 const char *name, const char *type,
1081 int seq, int page, int phase,
1083 enum pmbus_sensor_classes class,
1084 bool update, bool readonly,
1087 struct pmbus_sensor *sensor;
1088 struct device_attribute *a;
1090 sensor = devm_kzalloc(data->dev, sizeof(*sensor), GFP_KERNEL);
1093 a = &sensor->attribute;
1096 snprintf(sensor->name, sizeof(sensor->name), "%s%d_%s",
1099 snprintf(sensor->name, sizeof(sensor->name), "%s%d",
1102 if (data->flags & PMBUS_WRITE_PROTECTED)
1105 sensor->page = page;
1106 sensor->phase = phase;
1108 sensor->class = class;
1109 sensor->update = update;
1110 sensor->convert = convert;
1111 sensor->data = -ENODATA;
1112 pmbus_dev_attr_init(a, sensor->name,
1113 readonly ? 0444 : 0644,
1114 pmbus_show_sensor, pmbus_set_sensor);
1116 if (pmbus_add_attribute(data, &a->attr))
1119 sensor->next = data->sensors;
1120 data->sensors = sensor;
1125 static int pmbus_add_label(struct pmbus_data *data,
1126 const char *name, int seq,
1127 const char *lstring, int index, int phase)
1129 struct pmbus_label *label;
1130 struct device_attribute *a;
1132 label = devm_kzalloc(data->dev, sizeof(*label), GFP_KERNEL);
1136 a = &label->attribute;
1138 snprintf(label->name, sizeof(label->name), "%s%d_label", name, seq);
1141 strncpy(label->label, lstring,
1142 sizeof(label->label) - 1);
1144 snprintf(label->label, sizeof(label->label), "%s.%d",
1148 snprintf(label->label, sizeof(label->label), "%s%d",
1151 snprintf(label->label, sizeof(label->label), "%s%d.%d",
1152 lstring, index, phase);
1155 pmbus_dev_attr_init(a, label->name, 0444, pmbus_show_label, NULL);
1156 return pmbus_add_attribute(data, &a->attr);
1160 * Search for attributes. Allocate sensors, booleans, and labels as needed.
1164 * The pmbus_limit_attr structure describes a single limit attribute
1165 * and its associated alarm attribute.
1167 struct pmbus_limit_attr {
1168 u16 reg; /* Limit register */
1169 u16 sbit; /* Alarm attribute status bit */
1170 bool update; /* True if register needs updates */
1171 bool low; /* True if low limit; for limits with compare
1173 const char *attr; /* Attribute name */
1174 const char *alarm; /* Alarm attribute name */
1178 * The pmbus_sensor_attr structure describes one sensor attribute. This
1179 * description includes a reference to the associated limit attributes.
1181 struct pmbus_sensor_attr {
1182 u16 reg; /* sensor register */
1183 u16 gbit; /* generic status bit */
1184 u8 nlimit; /* # of limit registers */
1185 enum pmbus_sensor_classes class;/* sensor class */
1186 const char *label; /* sensor label */
1187 bool paged; /* true if paged sensor */
1188 bool update; /* true if update needed */
1189 bool compare; /* true if compare function needed */
1190 u32 func; /* sensor mask */
1191 u32 sfunc; /* sensor status mask */
1192 int sreg; /* status register */
1193 const struct pmbus_limit_attr *limit;/* limit registers */
1197 * Add a set of limit attributes and, if supported, the associated
1199 * returns 0 if no alarm register found, 1 if an alarm register was found,
1202 static int pmbus_add_limit_attrs(struct i2c_client *client,
1203 struct pmbus_data *data,
1204 const struct pmbus_driver_info *info,
1205 const char *name, int index, int page,
1206 struct pmbus_sensor *base,
1207 const struct pmbus_sensor_attr *attr)
1209 const struct pmbus_limit_attr *l = attr->limit;
1210 int nlimit = attr->nlimit;
1213 struct pmbus_sensor *curr;
1215 for (i = 0; i < nlimit; i++) {
1216 if (pmbus_check_word_register(client, page, l->reg)) {
1217 curr = pmbus_add_sensor(data, name, l->attr, index,
1218 page, 0xff, l->reg, attr->class,
1219 attr->update || l->update,
1223 if (l->sbit && (info->func[page] & attr->sfunc)) {
1224 ret = pmbus_add_boolean(data, name,
1226 attr->compare ? l->low ? curr : base
1228 attr->compare ? l->low ? base : curr
1230 page, attr->sreg, l->sbit);
1241 static int pmbus_add_sensor_attrs_one(struct i2c_client *client,
1242 struct pmbus_data *data,
1243 const struct pmbus_driver_info *info,
1245 int index, int page, int phase,
1246 const struct pmbus_sensor_attr *attr,
1249 struct pmbus_sensor *base;
1250 bool upper = !!(attr->gbit & 0xff00); /* need to check STATUS_WORD */
1254 ret = pmbus_add_label(data, name, index, attr->label,
1255 paged ? page + 1 : 0, phase);
1259 base = pmbus_add_sensor(data, name, "input", index, page, phase,
1260 attr->reg, attr->class, true, true, true);
1263 /* No limit and alarm attributes for phase specific sensors */
1264 if (attr->sfunc && phase == 0xff) {
1265 ret = pmbus_add_limit_attrs(client, data, info, name,
1266 index, page, base, attr);
1270 * Add generic alarm attribute only if there are no individual
1271 * alarm attributes, if there is a global alarm bit, and if
1272 * the generic status register (word or byte, depending on
1273 * which global bit is set) for this page is accessible.
1275 if (!ret && attr->gbit &&
1276 (!upper || data->has_status_word) &&
1277 pmbus_check_status_register(client, page)) {
1278 ret = pmbus_add_boolean(data, name, "alarm", index,
1280 page, PMBUS_STATUS_WORD,
1289 static bool pmbus_sensor_is_paged(const struct pmbus_driver_info *info,
1290 const struct pmbus_sensor_attr *attr)
1298 * Some attributes may be present on more than one page despite
1299 * not being marked with the paged attribute. If that is the case,
1300 * then treat the sensor as being paged and add the page suffix to the
1302 * We don't just add the paged attribute to all such attributes, in
1303 * order to maintain the un-suffixed labels in the case where the
1304 * attribute is only on page 0.
1306 for (p = 1; p < info->pages; p++) {
1307 if (info->func[p] & attr->func)
1313 static int pmbus_add_sensor_attrs(struct i2c_client *client,
1314 struct pmbus_data *data,
1316 const struct pmbus_sensor_attr *attrs,
1319 const struct pmbus_driver_info *info = data->info;
1324 for (i = 0; i < nattrs; i++) {
1326 bool paged = pmbus_sensor_is_paged(info, attrs);
1328 pages = paged ? info->pages : 1;
1329 for (page = 0; page < pages; page++) {
1330 if (!(info->func[page] & attrs->func))
1332 ret = pmbus_add_sensor_attrs_one(client, data, info,
1334 0xff, attrs, paged);
1338 if (info->phases[page]) {
1341 for (phase = 0; phase < info->phases[page];
1343 if (!(info->pfunc[phase] & attrs->func))
1345 ret = pmbus_add_sensor_attrs_one(client,
1346 data, info, name, index, page,
1347 phase, attrs, paged);
1359 static const struct pmbus_limit_attr vin_limit_attrs[] = {
1361 .reg = PMBUS_VIN_UV_WARN_LIMIT,
1363 .alarm = "min_alarm",
1364 .sbit = PB_VOLTAGE_UV_WARNING,
1366 .reg = PMBUS_VIN_UV_FAULT_LIMIT,
1368 .alarm = "lcrit_alarm",
1369 .sbit = PB_VOLTAGE_UV_FAULT,
1371 .reg = PMBUS_VIN_OV_WARN_LIMIT,
1373 .alarm = "max_alarm",
1374 .sbit = PB_VOLTAGE_OV_WARNING,
1376 .reg = PMBUS_VIN_OV_FAULT_LIMIT,
1378 .alarm = "crit_alarm",
1379 .sbit = PB_VOLTAGE_OV_FAULT,
1381 .reg = PMBUS_VIRT_READ_VIN_AVG,
1385 .reg = PMBUS_VIRT_READ_VIN_MIN,
1389 .reg = PMBUS_VIRT_READ_VIN_MAX,
1393 .reg = PMBUS_VIRT_RESET_VIN_HISTORY,
1394 .attr = "reset_history",
1396 .reg = PMBUS_MFR_VIN_MIN,
1397 .attr = "rated_min",
1399 .reg = PMBUS_MFR_VIN_MAX,
1400 .attr = "rated_max",
1404 static const struct pmbus_limit_attr vmon_limit_attrs[] = {
1406 .reg = PMBUS_VIRT_VMON_UV_WARN_LIMIT,
1408 .alarm = "min_alarm",
1409 .sbit = PB_VOLTAGE_UV_WARNING,
1411 .reg = PMBUS_VIRT_VMON_UV_FAULT_LIMIT,
1413 .alarm = "lcrit_alarm",
1414 .sbit = PB_VOLTAGE_UV_FAULT,
1416 .reg = PMBUS_VIRT_VMON_OV_WARN_LIMIT,
1418 .alarm = "max_alarm",
1419 .sbit = PB_VOLTAGE_OV_WARNING,
1421 .reg = PMBUS_VIRT_VMON_OV_FAULT_LIMIT,
1423 .alarm = "crit_alarm",
1424 .sbit = PB_VOLTAGE_OV_FAULT,
1428 static const struct pmbus_limit_attr vout_limit_attrs[] = {
1430 .reg = PMBUS_VOUT_UV_WARN_LIMIT,
1432 .alarm = "min_alarm",
1433 .sbit = PB_VOLTAGE_UV_WARNING,
1435 .reg = PMBUS_VOUT_UV_FAULT_LIMIT,
1437 .alarm = "lcrit_alarm",
1438 .sbit = PB_VOLTAGE_UV_FAULT,
1440 .reg = PMBUS_VOUT_OV_WARN_LIMIT,
1442 .alarm = "max_alarm",
1443 .sbit = PB_VOLTAGE_OV_WARNING,
1445 .reg = PMBUS_VOUT_OV_FAULT_LIMIT,
1447 .alarm = "crit_alarm",
1448 .sbit = PB_VOLTAGE_OV_FAULT,
1450 .reg = PMBUS_VIRT_READ_VOUT_AVG,
1454 .reg = PMBUS_VIRT_READ_VOUT_MIN,
1458 .reg = PMBUS_VIRT_READ_VOUT_MAX,
1462 .reg = PMBUS_VIRT_RESET_VOUT_HISTORY,
1463 .attr = "reset_history",
1465 .reg = PMBUS_MFR_VOUT_MIN,
1466 .attr = "rated_min",
1468 .reg = PMBUS_MFR_VOUT_MAX,
1469 .attr = "rated_max",
1473 static const struct pmbus_sensor_attr voltage_attributes[] = {
1475 .reg = PMBUS_READ_VIN,
1476 .class = PSC_VOLTAGE_IN,
1478 .func = PMBUS_HAVE_VIN,
1479 .sfunc = PMBUS_HAVE_STATUS_INPUT,
1480 .sreg = PMBUS_STATUS_INPUT,
1481 .gbit = PB_STATUS_VIN_UV,
1482 .limit = vin_limit_attrs,
1483 .nlimit = ARRAY_SIZE(vin_limit_attrs),
1485 .reg = PMBUS_VIRT_READ_VMON,
1486 .class = PSC_VOLTAGE_IN,
1488 .func = PMBUS_HAVE_VMON,
1489 .sfunc = PMBUS_HAVE_STATUS_VMON,
1490 .sreg = PMBUS_VIRT_STATUS_VMON,
1491 .limit = vmon_limit_attrs,
1492 .nlimit = ARRAY_SIZE(vmon_limit_attrs),
1494 .reg = PMBUS_READ_VCAP,
1495 .class = PSC_VOLTAGE_IN,
1497 .func = PMBUS_HAVE_VCAP,
1499 .reg = PMBUS_READ_VOUT,
1500 .class = PSC_VOLTAGE_OUT,
1503 .func = PMBUS_HAVE_VOUT,
1504 .sfunc = PMBUS_HAVE_STATUS_VOUT,
1505 .sreg = PMBUS_STATUS_VOUT,
1506 .gbit = PB_STATUS_VOUT_OV,
1507 .limit = vout_limit_attrs,
1508 .nlimit = ARRAY_SIZE(vout_limit_attrs),
1512 /* Current attributes */
1514 static const struct pmbus_limit_attr iin_limit_attrs[] = {
1516 .reg = PMBUS_IIN_OC_WARN_LIMIT,
1518 .alarm = "max_alarm",
1519 .sbit = PB_IIN_OC_WARNING,
1521 .reg = PMBUS_IIN_OC_FAULT_LIMIT,
1523 .alarm = "crit_alarm",
1524 .sbit = PB_IIN_OC_FAULT,
1526 .reg = PMBUS_VIRT_READ_IIN_AVG,
1530 .reg = PMBUS_VIRT_READ_IIN_MIN,
1534 .reg = PMBUS_VIRT_READ_IIN_MAX,
1538 .reg = PMBUS_VIRT_RESET_IIN_HISTORY,
1539 .attr = "reset_history",
1541 .reg = PMBUS_MFR_IIN_MAX,
1542 .attr = "rated_max",
1546 static const struct pmbus_limit_attr iout_limit_attrs[] = {
1548 .reg = PMBUS_IOUT_OC_WARN_LIMIT,
1550 .alarm = "max_alarm",
1551 .sbit = PB_IOUT_OC_WARNING,
1553 .reg = PMBUS_IOUT_UC_FAULT_LIMIT,
1555 .alarm = "lcrit_alarm",
1556 .sbit = PB_IOUT_UC_FAULT,
1558 .reg = PMBUS_IOUT_OC_FAULT_LIMIT,
1560 .alarm = "crit_alarm",
1561 .sbit = PB_IOUT_OC_FAULT,
1563 .reg = PMBUS_VIRT_READ_IOUT_AVG,
1567 .reg = PMBUS_VIRT_READ_IOUT_MIN,
1571 .reg = PMBUS_VIRT_READ_IOUT_MAX,
1575 .reg = PMBUS_VIRT_RESET_IOUT_HISTORY,
1576 .attr = "reset_history",
1578 .reg = PMBUS_MFR_IOUT_MAX,
1579 .attr = "rated_max",
1583 static const struct pmbus_sensor_attr current_attributes[] = {
1585 .reg = PMBUS_READ_IIN,
1586 .class = PSC_CURRENT_IN,
1588 .func = PMBUS_HAVE_IIN,
1589 .sfunc = PMBUS_HAVE_STATUS_INPUT,
1590 .sreg = PMBUS_STATUS_INPUT,
1591 .gbit = PB_STATUS_INPUT,
1592 .limit = iin_limit_attrs,
1593 .nlimit = ARRAY_SIZE(iin_limit_attrs),
1595 .reg = PMBUS_READ_IOUT,
1596 .class = PSC_CURRENT_OUT,
1599 .func = PMBUS_HAVE_IOUT,
1600 .sfunc = PMBUS_HAVE_STATUS_IOUT,
1601 .sreg = PMBUS_STATUS_IOUT,
1602 .gbit = PB_STATUS_IOUT_OC,
1603 .limit = iout_limit_attrs,
1604 .nlimit = ARRAY_SIZE(iout_limit_attrs),
1608 /* Power attributes */
1610 static const struct pmbus_limit_attr pin_limit_attrs[] = {
1612 .reg = PMBUS_PIN_OP_WARN_LIMIT,
1615 .sbit = PB_PIN_OP_WARNING,
1617 .reg = PMBUS_VIRT_READ_PIN_AVG,
1621 .reg = PMBUS_VIRT_READ_PIN_MIN,
1623 .attr = "input_lowest",
1625 .reg = PMBUS_VIRT_READ_PIN_MAX,
1627 .attr = "input_highest",
1629 .reg = PMBUS_VIRT_RESET_PIN_HISTORY,
1630 .attr = "reset_history",
1632 .reg = PMBUS_MFR_PIN_MAX,
1633 .attr = "rated_max",
1637 static const struct pmbus_limit_attr pout_limit_attrs[] = {
1639 .reg = PMBUS_POUT_MAX,
1641 .alarm = "cap_alarm",
1642 .sbit = PB_POWER_LIMITING,
1644 .reg = PMBUS_POUT_OP_WARN_LIMIT,
1646 .alarm = "max_alarm",
1647 .sbit = PB_POUT_OP_WARNING,
1649 .reg = PMBUS_POUT_OP_FAULT_LIMIT,
1651 .alarm = "crit_alarm",
1652 .sbit = PB_POUT_OP_FAULT,
1654 .reg = PMBUS_VIRT_READ_POUT_AVG,
1658 .reg = PMBUS_VIRT_READ_POUT_MIN,
1660 .attr = "input_lowest",
1662 .reg = PMBUS_VIRT_READ_POUT_MAX,
1664 .attr = "input_highest",
1666 .reg = PMBUS_VIRT_RESET_POUT_HISTORY,
1667 .attr = "reset_history",
1669 .reg = PMBUS_MFR_POUT_MAX,
1670 .attr = "rated_max",
1674 static const struct pmbus_sensor_attr power_attributes[] = {
1676 .reg = PMBUS_READ_PIN,
1679 .func = PMBUS_HAVE_PIN,
1680 .sfunc = PMBUS_HAVE_STATUS_INPUT,
1681 .sreg = PMBUS_STATUS_INPUT,
1682 .gbit = PB_STATUS_INPUT,
1683 .limit = pin_limit_attrs,
1684 .nlimit = ARRAY_SIZE(pin_limit_attrs),
1686 .reg = PMBUS_READ_POUT,
1690 .func = PMBUS_HAVE_POUT,
1691 .sfunc = PMBUS_HAVE_STATUS_IOUT,
1692 .sreg = PMBUS_STATUS_IOUT,
1693 .limit = pout_limit_attrs,
1694 .nlimit = ARRAY_SIZE(pout_limit_attrs),
1698 /* Temperature atributes */
1700 static const struct pmbus_limit_attr temp_limit_attrs[] = {
1702 .reg = PMBUS_UT_WARN_LIMIT,
1705 .alarm = "min_alarm",
1706 .sbit = PB_TEMP_UT_WARNING,
1708 .reg = PMBUS_UT_FAULT_LIMIT,
1711 .alarm = "lcrit_alarm",
1712 .sbit = PB_TEMP_UT_FAULT,
1714 .reg = PMBUS_OT_WARN_LIMIT,
1716 .alarm = "max_alarm",
1717 .sbit = PB_TEMP_OT_WARNING,
1719 .reg = PMBUS_OT_FAULT_LIMIT,
1721 .alarm = "crit_alarm",
1722 .sbit = PB_TEMP_OT_FAULT,
1724 .reg = PMBUS_VIRT_READ_TEMP_MIN,
1727 .reg = PMBUS_VIRT_READ_TEMP_AVG,
1730 .reg = PMBUS_VIRT_READ_TEMP_MAX,
1733 .reg = PMBUS_VIRT_RESET_TEMP_HISTORY,
1734 .attr = "reset_history",
1736 .reg = PMBUS_MFR_MAX_TEMP_1,
1737 .attr = "rated_max",
1741 static const struct pmbus_limit_attr temp_limit_attrs2[] = {
1743 .reg = PMBUS_UT_WARN_LIMIT,
1746 .alarm = "min_alarm",
1747 .sbit = PB_TEMP_UT_WARNING,
1749 .reg = PMBUS_UT_FAULT_LIMIT,
1752 .alarm = "lcrit_alarm",
1753 .sbit = PB_TEMP_UT_FAULT,
1755 .reg = PMBUS_OT_WARN_LIMIT,
1757 .alarm = "max_alarm",
1758 .sbit = PB_TEMP_OT_WARNING,
1760 .reg = PMBUS_OT_FAULT_LIMIT,
1762 .alarm = "crit_alarm",
1763 .sbit = PB_TEMP_OT_FAULT,
1765 .reg = PMBUS_VIRT_READ_TEMP2_MIN,
1768 .reg = PMBUS_VIRT_READ_TEMP2_AVG,
1771 .reg = PMBUS_VIRT_READ_TEMP2_MAX,
1774 .reg = PMBUS_VIRT_RESET_TEMP2_HISTORY,
1775 .attr = "reset_history",
1777 .reg = PMBUS_MFR_MAX_TEMP_2,
1778 .attr = "rated_max",
1782 static const struct pmbus_limit_attr temp_limit_attrs3[] = {
1784 .reg = PMBUS_UT_WARN_LIMIT,
1787 .alarm = "min_alarm",
1788 .sbit = PB_TEMP_UT_WARNING,
1790 .reg = PMBUS_UT_FAULT_LIMIT,
1793 .alarm = "lcrit_alarm",
1794 .sbit = PB_TEMP_UT_FAULT,
1796 .reg = PMBUS_OT_WARN_LIMIT,
1798 .alarm = "max_alarm",
1799 .sbit = PB_TEMP_OT_WARNING,
1801 .reg = PMBUS_OT_FAULT_LIMIT,
1803 .alarm = "crit_alarm",
1804 .sbit = PB_TEMP_OT_FAULT,
1806 .reg = PMBUS_MFR_MAX_TEMP_3,
1807 .attr = "rated_max",
1811 static const struct pmbus_sensor_attr temp_attributes[] = {
1813 .reg = PMBUS_READ_TEMPERATURE_1,
1814 .class = PSC_TEMPERATURE,
1818 .func = PMBUS_HAVE_TEMP,
1819 .sfunc = PMBUS_HAVE_STATUS_TEMP,
1820 .sreg = PMBUS_STATUS_TEMPERATURE,
1821 .gbit = PB_STATUS_TEMPERATURE,
1822 .limit = temp_limit_attrs,
1823 .nlimit = ARRAY_SIZE(temp_limit_attrs),
1825 .reg = PMBUS_READ_TEMPERATURE_2,
1826 .class = PSC_TEMPERATURE,
1830 .func = PMBUS_HAVE_TEMP2,
1831 .sfunc = PMBUS_HAVE_STATUS_TEMP,
1832 .sreg = PMBUS_STATUS_TEMPERATURE,
1833 .gbit = PB_STATUS_TEMPERATURE,
1834 .limit = temp_limit_attrs2,
1835 .nlimit = ARRAY_SIZE(temp_limit_attrs2),
1837 .reg = PMBUS_READ_TEMPERATURE_3,
1838 .class = PSC_TEMPERATURE,
1842 .func = PMBUS_HAVE_TEMP3,
1843 .sfunc = PMBUS_HAVE_STATUS_TEMP,
1844 .sreg = PMBUS_STATUS_TEMPERATURE,
1845 .gbit = PB_STATUS_TEMPERATURE,
1846 .limit = temp_limit_attrs3,
1847 .nlimit = ARRAY_SIZE(temp_limit_attrs3),
1851 static const int pmbus_fan_registers[] = {
1852 PMBUS_READ_FAN_SPEED_1,
1853 PMBUS_READ_FAN_SPEED_2,
1854 PMBUS_READ_FAN_SPEED_3,
1855 PMBUS_READ_FAN_SPEED_4
1858 static const int pmbus_fan_status_registers[] = {
1859 PMBUS_STATUS_FAN_12,
1860 PMBUS_STATUS_FAN_12,
1861 PMBUS_STATUS_FAN_34,
1865 static const u32 pmbus_fan_flags[] = {
1872 static const u32 pmbus_fan_status_flags[] = {
1873 PMBUS_HAVE_STATUS_FAN12,
1874 PMBUS_HAVE_STATUS_FAN12,
1875 PMBUS_HAVE_STATUS_FAN34,
1876 PMBUS_HAVE_STATUS_FAN34
1881 /* Precondition: FAN_CONFIG_x_y and FAN_COMMAND_x must exist for the fan ID */
1882 static int pmbus_add_fan_ctrl(struct i2c_client *client,
1883 struct pmbus_data *data, int index, int page, int id,
1886 struct pmbus_sensor *sensor;
1888 sensor = pmbus_add_sensor(data, "fan", "target", index, page,
1889 0xff, PMBUS_VIRT_FAN_TARGET_1 + id, PSC_FAN,
1890 false, false, true);
1895 if (!((data->info->func[page] & PMBUS_HAVE_PWM12) ||
1896 (data->info->func[page] & PMBUS_HAVE_PWM34)))
1899 sensor = pmbus_add_sensor(data, "pwm", NULL, index, page,
1900 0xff, PMBUS_VIRT_PWM_1 + id, PSC_PWM,
1901 false, false, true);
1906 sensor = pmbus_add_sensor(data, "pwm", "enable", index, page,
1907 0xff, PMBUS_VIRT_PWM_ENABLE_1 + id, PSC_PWM,
1908 true, false, false);
1916 static int pmbus_add_fan_attributes(struct i2c_client *client,
1917 struct pmbus_data *data)
1919 const struct pmbus_driver_info *info = data->info;
1924 for (page = 0; page < info->pages; page++) {
1927 for (f = 0; f < ARRAY_SIZE(pmbus_fan_registers); f++) {
1930 if (!(info->func[page] & pmbus_fan_flags[f]))
1933 if (!pmbus_check_word_register(client, page,
1934 pmbus_fan_registers[f]))
1938 * Skip fan if not installed.
1939 * Each fan configuration register covers multiple fans,
1940 * so we have to do some magic.
1942 regval = _pmbus_read_byte_data(client, page,
1943 pmbus_fan_config_registers[f]);
1945 (!(regval & (PB_FAN_1_INSTALLED >> ((f & 1) * 4)))))
1948 if (pmbus_add_sensor(data, "fan", "input", index,
1949 page, 0xff, pmbus_fan_registers[f],
1950 PSC_FAN, true, true, true) == NULL)
1954 if (pmbus_check_word_register(client, page,
1955 pmbus_fan_command_registers[f])) {
1956 ret = pmbus_add_fan_ctrl(client, data, index,
1963 * Each fan status register covers multiple fans,
1964 * so we have to do some magic.
1966 if ((info->func[page] & pmbus_fan_status_flags[f]) &&
1967 pmbus_check_byte_register(client,
1968 page, pmbus_fan_status_registers[f])) {
1971 if (f > 1) /* fan 3, 4 */
1972 reg = PMBUS_STATUS_FAN_34;
1974 reg = PMBUS_STATUS_FAN_12;
1975 ret = pmbus_add_boolean(data, "fan",
1976 "alarm", index, NULL, NULL, page, reg,
1977 PB_FAN_FAN1_WARNING >> (f & 1));
1980 ret = pmbus_add_boolean(data, "fan",
1981 "fault", index, NULL, NULL, page, reg,
1982 PB_FAN_FAN1_FAULT >> (f & 1));
1992 struct pmbus_samples_attr {
1997 struct pmbus_samples_reg {
1999 struct pmbus_samples_attr *attr;
2000 struct device_attribute dev_attr;
2003 static struct pmbus_samples_attr pmbus_samples_registers[] = {
2005 .reg = PMBUS_VIRT_SAMPLES,
2008 .reg = PMBUS_VIRT_IN_SAMPLES,
2009 .name = "in_samples",
2011 .reg = PMBUS_VIRT_CURR_SAMPLES,
2012 .name = "curr_samples",
2014 .reg = PMBUS_VIRT_POWER_SAMPLES,
2015 .name = "power_samples",
2017 .reg = PMBUS_VIRT_TEMP_SAMPLES,
2018 .name = "temp_samples",
2022 #define to_samples_reg(x) container_of(x, struct pmbus_samples_reg, dev_attr)
2024 static ssize_t pmbus_show_samples(struct device *dev,
2025 struct device_attribute *devattr, char *buf)
2028 struct i2c_client *client = to_i2c_client(dev->parent);
2029 struct pmbus_samples_reg *reg = to_samples_reg(devattr);
2030 struct pmbus_data *data = i2c_get_clientdata(client);
2032 mutex_lock(&data->update_lock);
2033 val = _pmbus_read_word_data(client, reg->page, 0xff, reg->attr->reg);
2034 mutex_unlock(&data->update_lock);
2038 return sysfs_emit(buf, "%d\n", val);
2041 static ssize_t pmbus_set_samples(struct device *dev,
2042 struct device_attribute *devattr,
2043 const char *buf, size_t count)
2047 struct i2c_client *client = to_i2c_client(dev->parent);
2048 struct pmbus_samples_reg *reg = to_samples_reg(devattr);
2049 struct pmbus_data *data = i2c_get_clientdata(client);
2051 if (kstrtol(buf, 0, &val) < 0)
2054 mutex_lock(&data->update_lock);
2055 ret = _pmbus_write_word_data(client, reg->page, reg->attr->reg, val);
2056 mutex_unlock(&data->update_lock);
2058 return ret ? : count;
2061 static int pmbus_add_samples_attr(struct pmbus_data *data, int page,
2062 struct pmbus_samples_attr *attr)
2064 struct pmbus_samples_reg *reg;
2066 reg = devm_kzalloc(data->dev, sizeof(*reg), GFP_KERNEL);
2073 pmbus_dev_attr_init(®->dev_attr, attr->name, 0644,
2074 pmbus_show_samples, pmbus_set_samples);
2076 return pmbus_add_attribute(data, ®->dev_attr.attr);
2079 static int pmbus_add_samples_attributes(struct i2c_client *client,
2080 struct pmbus_data *data)
2082 const struct pmbus_driver_info *info = data->info;
2085 if (!(info->func[0] & PMBUS_HAVE_SAMPLES))
2088 for (s = 0; s < ARRAY_SIZE(pmbus_samples_registers); s++) {
2089 struct pmbus_samples_attr *attr;
2092 attr = &pmbus_samples_registers[s];
2093 if (!pmbus_check_word_register(client, 0, attr->reg))
2096 ret = pmbus_add_samples_attr(data, 0, attr);
2104 static int pmbus_find_attributes(struct i2c_client *client,
2105 struct pmbus_data *data)
2109 /* Voltage sensors */
2110 ret = pmbus_add_sensor_attrs(client, data, "in", voltage_attributes,
2111 ARRAY_SIZE(voltage_attributes));
2115 /* Current sensors */
2116 ret = pmbus_add_sensor_attrs(client, data, "curr", current_attributes,
2117 ARRAY_SIZE(current_attributes));
2122 ret = pmbus_add_sensor_attrs(client, data, "power", power_attributes,
2123 ARRAY_SIZE(power_attributes));
2127 /* Temperature sensors */
2128 ret = pmbus_add_sensor_attrs(client, data, "temp", temp_attributes,
2129 ARRAY_SIZE(temp_attributes));
2134 ret = pmbus_add_fan_attributes(client, data);
2138 ret = pmbus_add_samples_attributes(client, data);
2143 * Identify chip parameters.
2144 * This function is called for all chips.
2146 static int pmbus_identify_common(struct i2c_client *client,
2147 struct pmbus_data *data, int page)
2151 if (pmbus_check_byte_register(client, page, PMBUS_VOUT_MODE))
2152 vout_mode = _pmbus_read_byte_data(client, page,
2154 if (vout_mode >= 0 && vout_mode != 0xff) {
2156 * Not all chips support the VOUT_MODE command,
2157 * so a failure to read it is not an error.
2159 switch (vout_mode >> 5) {
2160 case 0: /* linear mode */
2161 if (data->info->format[PSC_VOLTAGE_OUT] != linear)
2164 data->exponent[page] = ((s8)(vout_mode << 3)) >> 3;
2166 case 1: /* VID mode */
2167 if (data->info->format[PSC_VOLTAGE_OUT] != vid)
2170 case 2: /* direct mode */
2171 if (data->info->format[PSC_VOLTAGE_OUT] != direct)
2179 pmbus_clear_fault_page(client, page);
2183 static int pmbus_read_status_byte(struct i2c_client *client, int page)
2185 return _pmbus_read_byte_data(client, page, PMBUS_STATUS_BYTE);
2188 static int pmbus_read_status_word(struct i2c_client *client, int page)
2190 return _pmbus_read_word_data(client, page, 0xff, PMBUS_STATUS_WORD);
2193 static int pmbus_init_common(struct i2c_client *client, struct pmbus_data *data,
2194 struct pmbus_driver_info *info)
2196 struct device *dev = &client->dev;
2200 * Some PMBus chips don't support PMBUS_STATUS_WORD, so try
2201 * to use PMBUS_STATUS_BYTE instead if that is the case.
2202 * Bail out if both registers are not supported.
2204 data->read_status = pmbus_read_status_word;
2205 ret = i2c_smbus_read_word_data(client, PMBUS_STATUS_WORD);
2206 if (ret < 0 || ret == 0xffff) {
2207 data->read_status = pmbus_read_status_byte;
2208 ret = i2c_smbus_read_byte_data(client, PMBUS_STATUS_BYTE);
2209 if (ret < 0 || ret == 0xff) {
2210 dev_err(dev, "PMBus status register not found\n");
2214 data->has_status_word = true;
2217 /* Enable PEC if the controller supports it */
2218 if (!(data->flags & PMBUS_NO_CAPABILITY)) {
2219 ret = i2c_smbus_read_byte_data(client, PMBUS_CAPABILITY);
2220 if (ret >= 0 && (ret & PB_CAPABILITY_ERROR_CHECK))
2221 client->flags |= I2C_CLIENT_PEC;
2225 * Check if the chip is write protected. If it is, we can not clear
2226 * faults, and we should not try it. Also, in that case, writes into
2227 * limit registers need to be disabled.
2229 ret = i2c_smbus_read_byte_data(client, PMBUS_WRITE_PROTECT);
2230 if (ret > 0 && (ret & PB_WP_ANY))
2231 data->flags |= PMBUS_WRITE_PROTECTED | PMBUS_SKIP_STATUS_CHECK;
2233 if (data->info->pages)
2234 pmbus_clear_faults(client);
2236 pmbus_clear_fault_page(client, -1);
2238 if (info->identify) {
2239 ret = (*info->identify)(client, info);
2241 dev_err(dev, "Chip identification failed\n");
2246 if (info->pages <= 0 || info->pages > PMBUS_PAGES) {
2247 dev_err(dev, "Bad number of PMBus pages: %d\n", info->pages);
2251 for (page = 0; page < info->pages; page++) {
2252 ret = pmbus_identify_common(client, data, page);
2254 dev_err(dev, "Failed to identify chip capabilities\n");
2261 #if IS_ENABLED(CONFIG_REGULATOR)
2262 static int pmbus_regulator_is_enabled(struct regulator_dev *rdev)
2264 struct device *dev = rdev_get_dev(rdev);
2265 struct i2c_client *client = to_i2c_client(dev->parent);
2266 u8 page = rdev_get_id(rdev);
2269 ret = pmbus_read_byte_data(client, page, PMBUS_OPERATION);
2273 return !!(ret & PB_OPERATION_CONTROL_ON);
2276 static int _pmbus_regulator_on_off(struct regulator_dev *rdev, bool enable)
2278 struct device *dev = rdev_get_dev(rdev);
2279 struct i2c_client *client = to_i2c_client(dev->parent);
2280 u8 page = rdev_get_id(rdev);
2282 return pmbus_update_byte_data(client, page, PMBUS_OPERATION,
2283 PB_OPERATION_CONTROL_ON,
2284 enable ? PB_OPERATION_CONTROL_ON : 0);
2287 static int pmbus_regulator_enable(struct regulator_dev *rdev)
2289 return _pmbus_regulator_on_off(rdev, 1);
2292 static int pmbus_regulator_disable(struct regulator_dev *rdev)
2294 return _pmbus_regulator_on_off(rdev, 0);
2297 const struct regulator_ops pmbus_regulator_ops = {
2298 .enable = pmbus_regulator_enable,
2299 .disable = pmbus_regulator_disable,
2300 .is_enabled = pmbus_regulator_is_enabled,
2302 EXPORT_SYMBOL_NS_GPL(pmbus_regulator_ops, PMBUS);
2304 static int pmbus_regulator_register(struct pmbus_data *data)
2306 struct device *dev = data->dev;
2307 const struct pmbus_driver_info *info = data->info;
2308 const struct pmbus_platform_data *pdata = dev_get_platdata(dev);
2309 struct regulator_dev *rdev;
2312 for (i = 0; i < info->num_regulators; i++) {
2313 struct regulator_config config = { };
2316 config.driver_data = data;
2318 if (pdata && pdata->reg_init_data)
2319 config.init_data = &pdata->reg_init_data[i];
2321 rdev = devm_regulator_register(dev, &info->reg_desc[i],
2324 dev_err(dev, "Failed to register %s regulator\n",
2325 info->reg_desc[i].name);
2326 return PTR_ERR(rdev);
2333 static int pmbus_regulator_register(struct pmbus_data *data)
2339 static struct dentry *pmbus_debugfs_dir; /* pmbus debugfs directory */
2341 #if IS_ENABLED(CONFIG_DEBUG_FS)
2342 static int pmbus_debugfs_get(void *data, u64 *val)
2345 struct pmbus_debugfs_entry *entry = data;
2347 rc = _pmbus_read_byte_data(entry->client, entry->page, entry->reg);
2355 DEFINE_DEBUGFS_ATTRIBUTE(pmbus_debugfs_ops, pmbus_debugfs_get, NULL,
2358 static int pmbus_debugfs_get_status(void *data, u64 *val)
2361 struct pmbus_debugfs_entry *entry = data;
2362 struct pmbus_data *pdata = i2c_get_clientdata(entry->client);
2364 rc = pdata->read_status(entry->client, entry->page);
2372 DEFINE_DEBUGFS_ATTRIBUTE(pmbus_debugfs_ops_status, pmbus_debugfs_get_status,
2373 NULL, "0x%04llx\n");
2375 static int pmbus_debugfs_get_pec(void *data, u64 *val)
2377 struct i2c_client *client = data;
2379 *val = !!(client->flags & I2C_CLIENT_PEC);
2384 static int pmbus_debugfs_set_pec(void *data, u64 val)
2387 struct i2c_client *client = data;
2390 client->flags &= ~I2C_CLIENT_PEC;
2397 rc = i2c_smbus_read_byte_data(client, PMBUS_CAPABILITY);
2401 if (!(rc & PB_CAPABILITY_ERROR_CHECK))
2404 client->flags |= I2C_CLIENT_PEC;
2408 DEFINE_DEBUGFS_ATTRIBUTE(pmbus_debugfs_ops_pec, pmbus_debugfs_get_pec,
2409 pmbus_debugfs_set_pec, "%llu\n");
2411 static void pmbus_remove_debugfs(void *data)
2413 struct dentry *entry = data;
2415 debugfs_remove_recursive(entry);
2418 static int pmbus_init_debugfs(struct i2c_client *client,
2419 struct pmbus_data *data)
2422 char name[PMBUS_NAME_SIZE];
2423 struct pmbus_debugfs_entry *entries;
2425 if (!pmbus_debugfs_dir)
2429 * Create the debugfs directory for this device. Use the hwmon device
2430 * name to avoid conflicts (hwmon numbers are globally unique).
2432 data->debugfs = debugfs_create_dir(dev_name(data->hwmon_dev),
2434 if (IS_ERR_OR_NULL(data->debugfs)) {
2435 data->debugfs = NULL;
2439 /* Allocate the max possible entries we need. */
2440 entries = devm_kcalloc(data->dev,
2441 data->info->pages * 10, sizeof(*entries),
2446 debugfs_create_file("pec", 0664, data->debugfs, client,
2447 &pmbus_debugfs_ops_pec);
2449 for (i = 0; i < data->info->pages; ++i) {
2450 /* Check accessibility of status register if it's not page 0 */
2451 if (!i || pmbus_check_status_register(client, i)) {
2452 /* No need to set reg as we have special read op. */
2453 entries[idx].client = client;
2454 entries[idx].page = i;
2455 scnprintf(name, PMBUS_NAME_SIZE, "status%d", i);
2456 debugfs_create_file(name, 0444, data->debugfs,
2458 &pmbus_debugfs_ops_status);
2461 if (data->info->func[i] & PMBUS_HAVE_STATUS_VOUT) {
2462 entries[idx].client = client;
2463 entries[idx].page = i;
2464 entries[idx].reg = PMBUS_STATUS_VOUT;
2465 scnprintf(name, PMBUS_NAME_SIZE, "status%d_vout", i);
2466 debugfs_create_file(name, 0444, data->debugfs,
2468 &pmbus_debugfs_ops);
2471 if (data->info->func[i] & PMBUS_HAVE_STATUS_IOUT) {
2472 entries[idx].client = client;
2473 entries[idx].page = i;
2474 entries[idx].reg = PMBUS_STATUS_IOUT;
2475 scnprintf(name, PMBUS_NAME_SIZE, "status%d_iout", i);
2476 debugfs_create_file(name, 0444, data->debugfs,
2478 &pmbus_debugfs_ops);
2481 if (data->info->func[i] & PMBUS_HAVE_STATUS_INPUT) {
2482 entries[idx].client = client;
2483 entries[idx].page = i;
2484 entries[idx].reg = PMBUS_STATUS_INPUT;
2485 scnprintf(name, PMBUS_NAME_SIZE, "status%d_input", i);
2486 debugfs_create_file(name, 0444, data->debugfs,
2488 &pmbus_debugfs_ops);
2491 if (data->info->func[i] & PMBUS_HAVE_STATUS_TEMP) {
2492 entries[idx].client = client;
2493 entries[idx].page = i;
2494 entries[idx].reg = PMBUS_STATUS_TEMPERATURE;
2495 scnprintf(name, PMBUS_NAME_SIZE, "status%d_temp", i);
2496 debugfs_create_file(name, 0444, data->debugfs,
2498 &pmbus_debugfs_ops);
2501 if (pmbus_check_byte_register(client, i, PMBUS_STATUS_CML)) {
2502 entries[idx].client = client;
2503 entries[idx].page = i;
2504 entries[idx].reg = PMBUS_STATUS_CML;
2505 scnprintf(name, PMBUS_NAME_SIZE, "status%d_cml", i);
2506 debugfs_create_file(name, 0444, data->debugfs,
2508 &pmbus_debugfs_ops);
2511 if (pmbus_check_byte_register(client, i, PMBUS_STATUS_OTHER)) {
2512 entries[idx].client = client;
2513 entries[idx].page = i;
2514 entries[idx].reg = PMBUS_STATUS_OTHER;
2515 scnprintf(name, PMBUS_NAME_SIZE, "status%d_other", i);
2516 debugfs_create_file(name, 0444, data->debugfs,
2518 &pmbus_debugfs_ops);
2521 if (pmbus_check_byte_register(client, i,
2522 PMBUS_STATUS_MFR_SPECIFIC)) {
2523 entries[idx].client = client;
2524 entries[idx].page = i;
2525 entries[idx].reg = PMBUS_STATUS_MFR_SPECIFIC;
2526 scnprintf(name, PMBUS_NAME_SIZE, "status%d_mfr", i);
2527 debugfs_create_file(name, 0444, data->debugfs,
2529 &pmbus_debugfs_ops);
2532 if (data->info->func[i] & PMBUS_HAVE_STATUS_FAN12) {
2533 entries[idx].client = client;
2534 entries[idx].page = i;
2535 entries[idx].reg = PMBUS_STATUS_FAN_12;
2536 scnprintf(name, PMBUS_NAME_SIZE, "status%d_fan12", i);
2537 debugfs_create_file(name, 0444, data->debugfs,
2539 &pmbus_debugfs_ops);
2542 if (data->info->func[i] & PMBUS_HAVE_STATUS_FAN34) {
2543 entries[idx].client = client;
2544 entries[idx].page = i;
2545 entries[idx].reg = PMBUS_STATUS_FAN_34;
2546 scnprintf(name, PMBUS_NAME_SIZE, "status%d_fan34", i);
2547 debugfs_create_file(name, 0444, data->debugfs,
2549 &pmbus_debugfs_ops);
2553 return devm_add_action_or_reset(data->dev,
2554 pmbus_remove_debugfs, data->debugfs);
2557 static int pmbus_init_debugfs(struct i2c_client *client,
2558 struct pmbus_data *data)
2562 #endif /* IS_ENABLED(CONFIG_DEBUG_FS) */
2564 int pmbus_do_probe(struct i2c_client *client, struct pmbus_driver_info *info)
2566 struct device *dev = &client->dev;
2567 const struct pmbus_platform_data *pdata = dev_get_platdata(dev);
2568 struct pmbus_data *data;
2569 size_t groups_num = 0;
2576 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE
2577 | I2C_FUNC_SMBUS_BYTE_DATA
2578 | I2C_FUNC_SMBUS_WORD_DATA))
2581 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
2586 while (info->groups[groups_num])
2589 data->groups = devm_kcalloc(dev, groups_num + 2, sizeof(void *),
2594 i2c_set_clientdata(client, data);
2595 mutex_init(&data->update_lock);
2599 data->flags = pdata->flags;
2601 data->currpage = -1;
2602 data->currphase = -1;
2604 ret = pmbus_init_common(client, data, info);
2608 ret = pmbus_find_attributes(client, data);
2613 * If there are no attributes, something is wrong.
2614 * Bail out instead of trying to register nothing.
2616 if (!data->num_attributes) {
2617 dev_err(dev, "No attributes found\n");
2621 name = devm_kstrdup(dev, client->name, GFP_KERNEL);
2624 strreplace(name, '-', '_');
2626 data->groups[0] = &data->group;
2627 memcpy(data->groups + 1, info->groups, sizeof(void *) * groups_num);
2628 data->hwmon_dev = devm_hwmon_device_register_with_groups(dev,
2629 name, data, data->groups);
2630 if (IS_ERR(data->hwmon_dev)) {
2631 dev_err(dev, "Failed to register hwmon device\n");
2632 return PTR_ERR(data->hwmon_dev);
2635 ret = pmbus_regulator_register(data);
2639 ret = pmbus_init_debugfs(client, data);
2641 dev_warn(dev, "Failed to register debugfs\n");
2645 EXPORT_SYMBOL_NS_GPL(pmbus_do_probe, PMBUS);
2647 struct dentry *pmbus_get_debugfs_dir(struct i2c_client *client)
2649 struct pmbus_data *data = i2c_get_clientdata(client);
2651 return data->debugfs;
2653 EXPORT_SYMBOL_NS_GPL(pmbus_get_debugfs_dir, PMBUS);
2655 static int __init pmbus_core_init(void)
2657 pmbus_debugfs_dir = debugfs_create_dir("pmbus", NULL);
2658 if (IS_ERR(pmbus_debugfs_dir))
2659 pmbus_debugfs_dir = NULL;
2664 static void __exit pmbus_core_exit(void)
2666 debugfs_remove_recursive(pmbus_debugfs_dir);
2669 module_init(pmbus_core_init);
2670 module_exit(pmbus_core_exit);
2672 MODULE_AUTHOR("Guenter Roeck");
2673 MODULE_DESCRIPTION("PMBus core driver");
2674 MODULE_LICENSE("GPL");