2 * Hardware monitoring driver for PMBus devices
4 * Copyright (c) 2010, 2011 Ericsson AB.
5 * Copyright (c) 2012 Guenter Roeck
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 #include <linux/kernel.h>
23 #include <linux/module.h>
24 #include <linux/init.h>
25 #include <linux/err.h>
26 #include <linux/slab.h>
27 #include <linux/i2c.h>
28 #include <linux/hwmon.h>
29 #include <linux/hwmon-sysfs.h>
30 #include <linux/jiffies.h>
31 #include <linux/i2c/pmbus.h>
35 * Number of additional attribute pointers to allocate
36 * with each call to krealloc
38 #define PMBUS_ATTR_ALLOC_SIZE 32
41 * Index into status register array, per status register group
43 #define PB_STATUS_BASE 0
44 #define PB_STATUS_VOUT_BASE (PB_STATUS_BASE + PMBUS_PAGES)
45 #define PB_STATUS_IOUT_BASE (PB_STATUS_VOUT_BASE + PMBUS_PAGES)
46 #define PB_STATUS_FAN_BASE (PB_STATUS_IOUT_BASE + PMBUS_PAGES)
47 #define PB_STATUS_FAN34_BASE (PB_STATUS_FAN_BASE + PMBUS_PAGES)
48 #define PB_STATUS_TEMP_BASE (PB_STATUS_FAN34_BASE + PMBUS_PAGES)
49 #define PB_STATUS_INPUT_BASE (PB_STATUS_TEMP_BASE + PMBUS_PAGES)
50 #define PB_STATUS_VMON_BASE (PB_STATUS_INPUT_BASE + 1)
52 #define PB_NUM_STATUS_REG (PB_STATUS_VMON_BASE + 1)
54 #define PMBUS_NAME_SIZE 24
57 struct pmbus_sensor *next;
58 char name[PMBUS_NAME_SIZE]; /* sysfs sensor name */
59 struct device_attribute attribute;
60 u8 page; /* page number */
61 u16 reg; /* register */
62 enum pmbus_sensor_classes class; /* sensor class */
63 bool update; /* runtime sensor update needed */
64 int data; /* Sensor data.
65 Negative if there was a read error */
67 #define to_pmbus_sensor(_attr) \
68 container_of(_attr, struct pmbus_sensor, attribute)
70 struct pmbus_boolean {
71 char name[PMBUS_NAME_SIZE]; /* sysfs boolean name */
72 struct sensor_device_attribute attribute;
73 struct pmbus_sensor *s1;
74 struct pmbus_sensor *s2;
76 #define to_pmbus_boolean(_attr) \
77 container_of(_attr, struct pmbus_boolean, attribute)
80 char name[PMBUS_NAME_SIZE]; /* sysfs label name */
81 struct device_attribute attribute;
82 char label[PMBUS_NAME_SIZE]; /* label */
84 #define to_pmbus_label(_attr) \
85 container_of(_attr, struct pmbus_label, attribute)
89 struct device *hwmon_dev;
91 u32 flags; /* from platform data */
93 int exponent; /* linear mode: exponent for output voltages */
95 const struct pmbus_driver_info *info;
99 struct attribute_group group;
100 const struct attribute_group *groups[2];
102 struct pmbus_sensor *sensors;
104 struct mutex update_lock;
106 unsigned long last_updated; /* in jiffies */
109 * A single status register covers multiple attributes,
110 * so we keep them all together.
112 u8 status[PB_NUM_STATUS_REG];
118 void pmbus_clear_cache(struct i2c_client *client)
120 struct pmbus_data *data = i2c_get_clientdata(client);
124 EXPORT_SYMBOL_GPL(pmbus_clear_cache);
126 int pmbus_set_page(struct i2c_client *client, u8 page)
128 struct pmbus_data *data = i2c_get_clientdata(client);
132 if (page != data->currpage) {
133 rv = i2c_smbus_write_byte_data(client, PMBUS_PAGE, page);
134 newpage = i2c_smbus_read_byte_data(client, PMBUS_PAGE);
138 data->currpage = page;
142 EXPORT_SYMBOL_GPL(pmbus_set_page);
144 int pmbus_write_byte(struct i2c_client *client, int page, u8 value)
149 rv = pmbus_set_page(client, page);
154 return i2c_smbus_write_byte(client, value);
156 EXPORT_SYMBOL_GPL(pmbus_write_byte);
159 * _pmbus_write_byte() is similar to pmbus_write_byte(), but checks if
160 * a device specific mapping function exists and calls it if necessary.
162 static int _pmbus_write_byte(struct i2c_client *client, int page, u8 value)
164 struct pmbus_data *data = i2c_get_clientdata(client);
165 const struct pmbus_driver_info *info = data->info;
168 if (info->write_byte) {
169 status = info->write_byte(client, page, value);
170 if (status != -ENODATA)
173 return pmbus_write_byte(client, page, value);
176 int pmbus_write_word_data(struct i2c_client *client, u8 page, u8 reg, u16 word)
180 rv = pmbus_set_page(client, page);
184 return i2c_smbus_write_word_data(client, reg, word);
186 EXPORT_SYMBOL_GPL(pmbus_write_word_data);
189 * _pmbus_write_word_data() is similar to pmbus_write_word_data(), but checks if
190 * a device specific mapping function exists and calls it if necessary.
192 static int _pmbus_write_word_data(struct i2c_client *client, int page, int reg,
195 struct pmbus_data *data = i2c_get_clientdata(client);
196 const struct pmbus_driver_info *info = data->info;
199 if (info->write_word_data) {
200 status = info->write_word_data(client, page, reg, word);
201 if (status != -ENODATA)
204 if (reg >= PMBUS_VIRT_BASE)
206 return pmbus_write_word_data(client, page, reg, word);
209 int pmbus_read_word_data(struct i2c_client *client, u8 page, u8 reg)
213 rv = pmbus_set_page(client, page);
217 return i2c_smbus_read_word_data(client, reg);
219 EXPORT_SYMBOL_GPL(pmbus_read_word_data);
222 * _pmbus_read_word_data() is similar to pmbus_read_word_data(), but checks if
223 * a device specific mapping function exists and calls it if necessary.
225 static int _pmbus_read_word_data(struct i2c_client *client, int page, int reg)
227 struct pmbus_data *data = i2c_get_clientdata(client);
228 const struct pmbus_driver_info *info = data->info;
231 if (info->read_word_data) {
232 status = info->read_word_data(client, page, reg);
233 if (status != -ENODATA)
236 if (reg >= PMBUS_VIRT_BASE)
238 return pmbus_read_word_data(client, page, reg);
241 int pmbus_read_byte_data(struct i2c_client *client, int page, u8 reg)
246 rv = pmbus_set_page(client, page);
251 return i2c_smbus_read_byte_data(client, reg);
253 EXPORT_SYMBOL_GPL(pmbus_read_byte_data);
256 * _pmbus_read_byte_data() is similar to pmbus_read_byte_data(), but checks if
257 * a device specific mapping function exists and calls it if necessary.
259 static int _pmbus_read_byte_data(struct i2c_client *client, int page, int reg)
261 struct pmbus_data *data = i2c_get_clientdata(client);
262 const struct pmbus_driver_info *info = data->info;
265 if (info->read_byte_data) {
266 status = info->read_byte_data(client, page, reg);
267 if (status != -ENODATA)
270 return pmbus_read_byte_data(client, page, reg);
273 static void pmbus_clear_fault_page(struct i2c_client *client, int page)
275 _pmbus_write_byte(client, page, PMBUS_CLEAR_FAULTS);
278 void pmbus_clear_faults(struct i2c_client *client)
280 struct pmbus_data *data = i2c_get_clientdata(client);
283 for (i = 0; i < data->info->pages; i++)
284 pmbus_clear_fault_page(client, i);
286 EXPORT_SYMBOL_GPL(pmbus_clear_faults);
288 static int pmbus_check_status_cml(struct i2c_client *client)
290 struct pmbus_data *data = i2c_get_clientdata(client);
293 status = _pmbus_read_byte_data(client, -1, data->status_register);
294 if (status < 0 || (status & PB_STATUS_CML)) {
295 status2 = _pmbus_read_byte_data(client, -1, PMBUS_STATUS_CML);
296 if (status2 < 0 || (status2 & PB_CML_FAULT_INVALID_COMMAND))
302 static bool pmbus_check_register(struct i2c_client *client,
303 int (*func)(struct i2c_client *client,
308 struct pmbus_data *data = i2c_get_clientdata(client);
310 rv = func(client, page, reg);
311 if (rv >= 0 && !(data->flags & PMBUS_SKIP_STATUS_CHECK))
312 rv = pmbus_check_status_cml(client);
313 pmbus_clear_fault_page(client, -1);
317 bool pmbus_check_byte_register(struct i2c_client *client, int page, int reg)
319 return pmbus_check_register(client, _pmbus_read_byte_data, page, reg);
321 EXPORT_SYMBOL_GPL(pmbus_check_byte_register);
323 bool pmbus_check_word_register(struct i2c_client *client, int page, int reg)
325 return pmbus_check_register(client, _pmbus_read_word_data, page, reg);
327 EXPORT_SYMBOL_GPL(pmbus_check_word_register);
329 const struct pmbus_driver_info *pmbus_get_driver_info(struct i2c_client *client)
331 struct pmbus_data *data = i2c_get_clientdata(client);
335 EXPORT_SYMBOL_GPL(pmbus_get_driver_info);
337 static struct _pmbus_status {
342 { PMBUS_HAVE_STATUS_VOUT, PB_STATUS_VOUT_BASE, PMBUS_STATUS_VOUT },
343 { PMBUS_HAVE_STATUS_IOUT, PB_STATUS_IOUT_BASE, PMBUS_STATUS_IOUT },
344 { PMBUS_HAVE_STATUS_TEMP, PB_STATUS_TEMP_BASE,
345 PMBUS_STATUS_TEMPERATURE },
346 { PMBUS_HAVE_STATUS_FAN12, PB_STATUS_FAN_BASE, PMBUS_STATUS_FAN_12 },
347 { PMBUS_HAVE_STATUS_FAN34, PB_STATUS_FAN34_BASE, PMBUS_STATUS_FAN_34 },
350 static struct pmbus_data *pmbus_update_device(struct device *dev)
352 struct i2c_client *client = to_i2c_client(dev->parent);
353 struct pmbus_data *data = i2c_get_clientdata(client);
354 const struct pmbus_driver_info *info = data->info;
355 struct pmbus_sensor *sensor;
357 mutex_lock(&data->update_lock);
358 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
361 for (i = 0; i < info->pages; i++) {
362 data->status[PB_STATUS_BASE + i]
363 = _pmbus_read_byte_data(client, i,
364 data->status_register);
365 for (j = 0; j < ARRAY_SIZE(pmbus_status); j++) {
366 struct _pmbus_status *s = &pmbus_status[j];
368 if (!(info->func[i] & s->func))
370 data->status[s->base + i]
371 = _pmbus_read_byte_data(client, i,
376 if (info->func[0] & PMBUS_HAVE_STATUS_INPUT)
377 data->status[PB_STATUS_INPUT_BASE]
378 = _pmbus_read_byte_data(client, 0,
381 if (info->func[0] & PMBUS_HAVE_STATUS_VMON)
382 data->status[PB_STATUS_VMON_BASE]
383 = _pmbus_read_byte_data(client, 0,
384 PMBUS_VIRT_STATUS_VMON);
386 for (sensor = data->sensors; sensor; sensor = sensor->next) {
387 if (!data->valid || sensor->update)
389 = _pmbus_read_word_data(client,
393 pmbus_clear_faults(client);
394 data->last_updated = jiffies;
397 mutex_unlock(&data->update_lock);
402 * Convert linear sensor values to milli- or micro-units
403 * depending on sensor type.
405 static long pmbus_reg2data_linear(struct pmbus_data *data,
406 struct pmbus_sensor *sensor)
412 if (sensor->class == PSC_VOLTAGE_OUT) { /* LINEAR16 */
413 exponent = data->exponent;
414 mantissa = (u16) sensor->data;
415 } else { /* LINEAR11 */
416 exponent = ((s16)sensor->data) >> 11;
417 mantissa = ((s16)((sensor->data & 0x7ff) << 5)) >> 5;
422 /* scale result to milli-units for all sensors except fans */
423 if (sensor->class != PSC_FAN)
426 /* scale result to micro-units for power sensors */
427 if (sensor->class == PSC_POWER)
439 * Convert direct sensor values to milli- or micro-units
440 * depending on sensor type.
442 static long pmbus_reg2data_direct(struct pmbus_data *data,
443 struct pmbus_sensor *sensor)
445 long val = (s16) sensor->data;
448 m = data->info->m[sensor->class];
449 b = data->info->b[sensor->class];
450 R = data->info->R[sensor->class];
455 /* X = 1/m * (Y * 10^-R - b) */
457 /* scale result to milli-units for everything but fans */
458 if (sensor->class != PSC_FAN) {
463 /* scale result to micro-units for power sensors */
464 if (sensor->class == PSC_POWER) {
474 val = DIV_ROUND_CLOSEST(val, 10);
478 return (val - b) / m;
482 * Convert VID sensor values to milli- or micro-units
483 * depending on sensor type.
484 * We currently only support VR11.
486 static long pmbus_reg2data_vid(struct pmbus_data *data,
487 struct pmbus_sensor *sensor)
489 long val = sensor->data;
491 if (val < 0x02 || val > 0xb2)
493 return DIV_ROUND_CLOSEST(160000 - (val - 2) * 625, 100);
496 static long pmbus_reg2data(struct pmbus_data *data, struct pmbus_sensor *sensor)
500 switch (data->info->format[sensor->class]) {
502 val = pmbus_reg2data_direct(data, sensor);
505 val = pmbus_reg2data_vid(data, sensor);
509 val = pmbus_reg2data_linear(data, sensor);
515 #define MAX_MANTISSA (1023 * 1000)
516 #define MIN_MANTISSA (511 * 1000)
518 static u16 pmbus_data2reg_linear(struct pmbus_data *data,
519 enum pmbus_sensor_classes class, long val)
521 s16 exponent = 0, mantissa;
522 bool negative = false;
528 if (class == PSC_VOLTAGE_OUT) {
529 /* LINEAR16 does not support negative voltages */
534 * For a static exponents, we don't have a choice
535 * but to adjust the value to it.
537 if (data->exponent < 0)
538 val <<= -data->exponent;
540 val >>= data->exponent;
541 val = DIV_ROUND_CLOSEST(val, 1000);
550 /* Power is in uW. Convert to mW before converting. */
551 if (class == PSC_POWER)
552 val = DIV_ROUND_CLOSEST(val, 1000L);
555 * For simplicity, convert fan data to milli-units
556 * before calculating the exponent.
558 if (class == PSC_FAN)
561 /* Reduce large mantissa until it fits into 10 bit */
562 while (val >= MAX_MANTISSA && exponent < 15) {
566 /* Increase small mantissa to improve precision */
567 while (val < MIN_MANTISSA && exponent > -15) {
572 /* Convert mantissa from milli-units to units */
573 mantissa = DIV_ROUND_CLOSEST(val, 1000);
575 /* Ensure that resulting number is within range */
576 if (mantissa > 0x3ff)
581 mantissa = -mantissa;
583 /* Convert to 5 bit exponent, 11 bit mantissa */
584 return (mantissa & 0x7ff) | ((exponent << 11) & 0xf800);
587 static u16 pmbus_data2reg_direct(struct pmbus_data *data,
588 enum pmbus_sensor_classes class, long val)
592 m = data->info->m[class];
593 b = data->info->b[class];
594 R = data->info->R[class];
596 /* Power is in uW. Adjust R and b. */
597 if (class == PSC_POWER) {
602 /* Calculate Y = (m * X + b) * 10^R */
603 if (class != PSC_FAN) {
604 R -= 3; /* Adjust R and b for data in milli-units */
614 val = DIV_ROUND_CLOSEST(val, 10);
621 static u16 pmbus_data2reg_vid(struct pmbus_data *data,
622 enum pmbus_sensor_classes class, long val)
624 val = clamp_val(val, 500, 1600);
626 return 2 + DIV_ROUND_CLOSEST((1600 - val) * 100, 625);
629 static u16 pmbus_data2reg(struct pmbus_data *data,
630 enum pmbus_sensor_classes class, long val)
634 switch (data->info->format[class]) {
636 regval = pmbus_data2reg_direct(data, class, val);
639 regval = pmbus_data2reg_vid(data, class, val);
643 regval = pmbus_data2reg_linear(data, class, val);
650 * Return boolean calculated from converted data.
651 * <index> defines a status register index and mask.
652 * The mask is in the lower 8 bits, the register index is in bits 8..23.
654 * The associated pmbus_boolean structure contains optional pointers to two
655 * sensor attributes. If specified, those attributes are compared against each
656 * other to determine if a limit has been exceeded.
658 * If the sensor attribute pointers are NULL, the function returns true if
659 * (status[reg] & mask) is true.
661 * If sensor attribute pointers are provided, a comparison against a specified
662 * limit has to be performed to determine the boolean result.
663 * In this case, the function returns true if v1 >= v2 (where v1 and v2 are
664 * sensor values referenced by sensor attribute pointers s1 and s2).
666 * To determine if an object exceeds upper limits, specify <s1,s2> = <v,limit>.
667 * To determine if an object exceeds lower limits, specify <s1,s2> = <limit,v>.
669 * If a negative value is stored in any of the referenced registers, this value
670 * reflects an error code which will be returned.
672 static int pmbus_get_boolean(struct pmbus_data *data, struct pmbus_boolean *b,
675 struct pmbus_sensor *s1 = b->s1;
676 struct pmbus_sensor *s2 = b->s2;
677 u16 reg = (index >> 8) & 0xffff;
678 u8 mask = index & 0xff;
682 status = data->status[reg];
686 regval = status & mask;
689 } else if (!s1 || !s2) {
690 WARN(1, "Bad boolean descriptor %p: s1=%p, s2=%p\n", b, s1, s2);
700 v1 = pmbus_reg2data(data, s1);
701 v2 = pmbus_reg2data(data, s2);
702 ret = !!(regval && v1 >= v2);
707 static ssize_t pmbus_show_boolean(struct device *dev,
708 struct device_attribute *da, char *buf)
710 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
711 struct pmbus_boolean *boolean = to_pmbus_boolean(attr);
712 struct pmbus_data *data = pmbus_update_device(dev);
715 val = pmbus_get_boolean(data, boolean, attr->index);
718 return snprintf(buf, PAGE_SIZE, "%d\n", val);
721 static ssize_t pmbus_show_sensor(struct device *dev,
722 struct device_attribute *devattr, char *buf)
724 struct pmbus_data *data = pmbus_update_device(dev);
725 struct pmbus_sensor *sensor = to_pmbus_sensor(devattr);
727 if (sensor->data < 0)
730 return snprintf(buf, PAGE_SIZE, "%ld\n", pmbus_reg2data(data, sensor));
733 static ssize_t pmbus_set_sensor(struct device *dev,
734 struct device_attribute *devattr,
735 const char *buf, size_t count)
737 struct i2c_client *client = to_i2c_client(dev->parent);
738 struct pmbus_data *data = i2c_get_clientdata(client);
739 struct pmbus_sensor *sensor = to_pmbus_sensor(devattr);
745 if (kstrtol(buf, 10, &val) < 0)
748 mutex_lock(&data->update_lock);
749 regval = pmbus_data2reg(data, sensor->class, val);
750 ret = _pmbus_write_word_data(client, sensor->page, sensor->reg, regval);
754 sensor->data = regval;
755 mutex_unlock(&data->update_lock);
759 static ssize_t pmbus_show_label(struct device *dev,
760 struct device_attribute *da, char *buf)
762 struct pmbus_label *label = to_pmbus_label(da);
764 return snprintf(buf, PAGE_SIZE, "%s\n", label->label);
767 static int pmbus_add_attribute(struct pmbus_data *data, struct attribute *attr)
769 if (data->num_attributes >= data->max_attributes - 1) {
770 int new_max_attrs = data->max_attributes + PMBUS_ATTR_ALLOC_SIZE;
771 void *new_attrs = krealloc(data->group.attrs,
772 new_max_attrs * sizeof(void *),
776 data->group.attrs = new_attrs;
777 data->max_attributes = new_max_attrs;
780 data->group.attrs[data->num_attributes++] = attr;
781 data->group.attrs[data->num_attributes] = NULL;
785 static void pmbus_dev_attr_init(struct device_attribute *dev_attr,
788 ssize_t (*show)(struct device *dev,
789 struct device_attribute *attr,
791 ssize_t (*store)(struct device *dev,
792 struct device_attribute *attr,
793 const char *buf, size_t count))
795 sysfs_attr_init(&dev_attr->attr);
796 dev_attr->attr.name = name;
797 dev_attr->attr.mode = mode;
798 dev_attr->show = show;
799 dev_attr->store = store;
802 static void pmbus_attr_init(struct sensor_device_attribute *a,
805 ssize_t (*show)(struct device *dev,
806 struct device_attribute *attr,
808 ssize_t (*store)(struct device *dev,
809 struct device_attribute *attr,
810 const char *buf, size_t count),
813 pmbus_dev_attr_init(&a->dev_attr, name, mode, show, store);
817 static int pmbus_add_boolean(struct pmbus_data *data,
818 const char *name, const char *type, int seq,
819 struct pmbus_sensor *s1,
820 struct pmbus_sensor *s2,
823 struct pmbus_boolean *boolean;
824 struct sensor_device_attribute *a;
826 boolean = devm_kzalloc(data->dev, sizeof(*boolean), GFP_KERNEL);
830 a = &boolean->attribute;
832 snprintf(boolean->name, sizeof(boolean->name), "%s%d_%s",
836 pmbus_attr_init(a, boolean->name, S_IRUGO, pmbus_show_boolean, NULL,
839 return pmbus_add_attribute(data, &a->dev_attr.attr);
842 static struct pmbus_sensor *pmbus_add_sensor(struct pmbus_data *data,
843 const char *name, const char *type,
844 int seq, int page, int reg,
845 enum pmbus_sensor_classes class,
846 bool update, bool readonly)
848 struct pmbus_sensor *sensor;
849 struct device_attribute *a;
851 sensor = devm_kzalloc(data->dev, sizeof(*sensor), GFP_KERNEL);
854 a = &sensor->attribute;
856 snprintf(sensor->name, sizeof(sensor->name), "%s%d_%s",
860 sensor->class = class;
861 sensor->update = update;
862 pmbus_dev_attr_init(a, sensor->name,
863 readonly ? S_IRUGO : S_IRUGO | S_IWUSR,
864 pmbus_show_sensor, pmbus_set_sensor);
866 if (pmbus_add_attribute(data, &a->attr))
869 sensor->next = data->sensors;
870 data->sensors = sensor;
875 static int pmbus_add_label(struct pmbus_data *data,
876 const char *name, int seq,
877 const char *lstring, int index)
879 struct pmbus_label *label;
880 struct device_attribute *a;
882 label = devm_kzalloc(data->dev, sizeof(*label), GFP_KERNEL);
886 a = &label->attribute;
888 snprintf(label->name, sizeof(label->name), "%s%d_label", name, seq);
890 strncpy(label->label, lstring, sizeof(label->label) - 1);
892 snprintf(label->label, sizeof(label->label), "%s%d", lstring,
895 pmbus_dev_attr_init(a, label->name, S_IRUGO, pmbus_show_label, NULL);
896 return pmbus_add_attribute(data, &a->attr);
900 * Search for attributes. Allocate sensors, booleans, and labels as needed.
904 * The pmbus_limit_attr structure describes a single limit attribute
905 * and its associated alarm attribute.
907 struct pmbus_limit_attr {
908 u16 reg; /* Limit register */
909 u16 sbit; /* Alarm attribute status bit */
910 bool update; /* True if register needs updates */
911 bool low; /* True if low limit; for limits with compare
913 const char *attr; /* Attribute name */
914 const char *alarm; /* Alarm attribute name */
918 * The pmbus_sensor_attr structure describes one sensor attribute. This
919 * description includes a reference to the associated limit attributes.
921 struct pmbus_sensor_attr {
922 u16 reg; /* sensor register */
923 u8 gbit; /* generic status bit */
924 u8 nlimit; /* # of limit registers */
925 enum pmbus_sensor_classes class;/* sensor class */
926 const char *label; /* sensor label */
927 bool paged; /* true if paged sensor */
928 bool update; /* true if update needed */
929 bool compare; /* true if compare function needed */
930 u32 func; /* sensor mask */
931 u32 sfunc; /* sensor status mask */
932 int sbase; /* status base register */
933 const struct pmbus_limit_attr *limit;/* limit registers */
937 * Add a set of limit attributes and, if supported, the associated
939 * returns 0 if no alarm register found, 1 if an alarm register was found,
942 static int pmbus_add_limit_attrs(struct i2c_client *client,
943 struct pmbus_data *data,
944 const struct pmbus_driver_info *info,
945 const char *name, int index, int page,
946 struct pmbus_sensor *base,
947 const struct pmbus_sensor_attr *attr)
949 const struct pmbus_limit_attr *l = attr->limit;
950 int nlimit = attr->nlimit;
953 struct pmbus_sensor *curr;
955 for (i = 0; i < nlimit; i++) {
956 if (pmbus_check_word_register(client, page, l->reg)) {
957 curr = pmbus_add_sensor(data, name, l->attr, index,
958 page, l->reg, attr->class,
959 attr->update || l->update,
963 if (l->sbit && (info->func[page] & attr->sfunc)) {
964 ret = pmbus_add_boolean(data, name,
966 attr->compare ? l->low ? curr : base
968 attr->compare ? l->low ? base : curr
970 attr->sbase + page, l->sbit);
981 static int pmbus_add_sensor_attrs_one(struct i2c_client *client,
982 struct pmbus_data *data,
983 const struct pmbus_driver_info *info,
986 const struct pmbus_sensor_attr *attr)
988 struct pmbus_sensor *base;
992 ret = pmbus_add_label(data, name, index, attr->label,
993 attr->paged ? page + 1 : 0);
997 base = pmbus_add_sensor(data, name, "input", index, page, attr->reg,
998 attr->class, true, true);
1002 ret = pmbus_add_limit_attrs(client, data, info, name,
1003 index, page, base, attr);
1007 * Add generic alarm attribute only if there are no individual
1008 * alarm attributes, if there is a global alarm bit, and if
1009 * the generic status register for this page is accessible.
1011 if (!ret && attr->gbit &&
1012 pmbus_check_byte_register(client, page,
1013 data->status_register)) {
1014 ret = pmbus_add_boolean(data, name, "alarm", index,
1016 PB_STATUS_BASE + page,
1025 static int pmbus_add_sensor_attrs(struct i2c_client *client,
1026 struct pmbus_data *data,
1028 const struct pmbus_sensor_attr *attrs,
1031 const struct pmbus_driver_info *info = data->info;
1036 for (i = 0; i < nattrs; i++) {
1039 pages = attrs->paged ? info->pages : 1;
1040 for (page = 0; page < pages; page++) {
1041 if (!(info->func[page] & attrs->func))
1043 ret = pmbus_add_sensor_attrs_one(client, data, info,
1055 static const struct pmbus_limit_attr vin_limit_attrs[] = {
1057 .reg = PMBUS_VIN_UV_WARN_LIMIT,
1059 .alarm = "min_alarm",
1060 .sbit = PB_VOLTAGE_UV_WARNING,
1062 .reg = PMBUS_VIN_UV_FAULT_LIMIT,
1064 .alarm = "lcrit_alarm",
1065 .sbit = PB_VOLTAGE_UV_FAULT,
1067 .reg = PMBUS_VIN_OV_WARN_LIMIT,
1069 .alarm = "max_alarm",
1070 .sbit = PB_VOLTAGE_OV_WARNING,
1072 .reg = PMBUS_VIN_OV_FAULT_LIMIT,
1074 .alarm = "crit_alarm",
1075 .sbit = PB_VOLTAGE_OV_FAULT,
1077 .reg = PMBUS_VIRT_READ_VIN_AVG,
1081 .reg = PMBUS_VIRT_READ_VIN_MIN,
1085 .reg = PMBUS_VIRT_READ_VIN_MAX,
1089 .reg = PMBUS_VIRT_RESET_VIN_HISTORY,
1090 .attr = "reset_history",
1094 static const struct pmbus_limit_attr vmon_limit_attrs[] = {
1096 .reg = PMBUS_VIRT_VMON_UV_WARN_LIMIT,
1098 .alarm = "min_alarm",
1099 .sbit = PB_VOLTAGE_UV_WARNING,
1101 .reg = PMBUS_VIRT_VMON_UV_FAULT_LIMIT,
1103 .alarm = "lcrit_alarm",
1104 .sbit = PB_VOLTAGE_UV_FAULT,
1106 .reg = PMBUS_VIRT_VMON_OV_WARN_LIMIT,
1108 .alarm = "max_alarm",
1109 .sbit = PB_VOLTAGE_OV_WARNING,
1111 .reg = PMBUS_VIRT_VMON_OV_FAULT_LIMIT,
1113 .alarm = "crit_alarm",
1114 .sbit = PB_VOLTAGE_OV_FAULT,
1118 static const struct pmbus_limit_attr vout_limit_attrs[] = {
1120 .reg = PMBUS_VOUT_UV_WARN_LIMIT,
1122 .alarm = "min_alarm",
1123 .sbit = PB_VOLTAGE_UV_WARNING,
1125 .reg = PMBUS_VOUT_UV_FAULT_LIMIT,
1127 .alarm = "lcrit_alarm",
1128 .sbit = PB_VOLTAGE_UV_FAULT,
1130 .reg = PMBUS_VOUT_OV_WARN_LIMIT,
1132 .alarm = "max_alarm",
1133 .sbit = PB_VOLTAGE_OV_WARNING,
1135 .reg = PMBUS_VOUT_OV_FAULT_LIMIT,
1137 .alarm = "crit_alarm",
1138 .sbit = PB_VOLTAGE_OV_FAULT,
1140 .reg = PMBUS_VIRT_READ_VOUT_AVG,
1144 .reg = PMBUS_VIRT_READ_VOUT_MIN,
1148 .reg = PMBUS_VIRT_READ_VOUT_MAX,
1152 .reg = PMBUS_VIRT_RESET_VOUT_HISTORY,
1153 .attr = "reset_history",
1157 static const struct pmbus_sensor_attr voltage_attributes[] = {
1159 .reg = PMBUS_READ_VIN,
1160 .class = PSC_VOLTAGE_IN,
1162 .func = PMBUS_HAVE_VIN,
1163 .sfunc = PMBUS_HAVE_STATUS_INPUT,
1164 .sbase = PB_STATUS_INPUT_BASE,
1165 .gbit = PB_STATUS_VIN_UV,
1166 .limit = vin_limit_attrs,
1167 .nlimit = ARRAY_SIZE(vin_limit_attrs),
1169 .reg = PMBUS_VIRT_READ_VMON,
1170 .class = PSC_VOLTAGE_IN,
1172 .func = PMBUS_HAVE_VMON,
1173 .sfunc = PMBUS_HAVE_STATUS_VMON,
1174 .sbase = PB_STATUS_VMON_BASE,
1175 .limit = vmon_limit_attrs,
1176 .nlimit = ARRAY_SIZE(vmon_limit_attrs),
1178 .reg = PMBUS_READ_VCAP,
1179 .class = PSC_VOLTAGE_IN,
1181 .func = PMBUS_HAVE_VCAP,
1183 .reg = PMBUS_READ_VOUT,
1184 .class = PSC_VOLTAGE_OUT,
1187 .func = PMBUS_HAVE_VOUT,
1188 .sfunc = PMBUS_HAVE_STATUS_VOUT,
1189 .sbase = PB_STATUS_VOUT_BASE,
1190 .gbit = PB_STATUS_VOUT_OV,
1191 .limit = vout_limit_attrs,
1192 .nlimit = ARRAY_SIZE(vout_limit_attrs),
1196 /* Current attributes */
1198 static const struct pmbus_limit_attr iin_limit_attrs[] = {
1200 .reg = PMBUS_IIN_OC_WARN_LIMIT,
1202 .alarm = "max_alarm",
1203 .sbit = PB_IIN_OC_WARNING,
1205 .reg = PMBUS_IIN_OC_FAULT_LIMIT,
1207 .alarm = "crit_alarm",
1208 .sbit = PB_IIN_OC_FAULT,
1210 .reg = PMBUS_VIRT_READ_IIN_AVG,
1214 .reg = PMBUS_VIRT_READ_IIN_MIN,
1218 .reg = PMBUS_VIRT_READ_IIN_MAX,
1222 .reg = PMBUS_VIRT_RESET_IIN_HISTORY,
1223 .attr = "reset_history",
1227 static const struct pmbus_limit_attr iout_limit_attrs[] = {
1229 .reg = PMBUS_IOUT_OC_WARN_LIMIT,
1231 .alarm = "max_alarm",
1232 .sbit = PB_IOUT_OC_WARNING,
1234 .reg = PMBUS_IOUT_UC_FAULT_LIMIT,
1236 .alarm = "lcrit_alarm",
1237 .sbit = PB_IOUT_UC_FAULT,
1239 .reg = PMBUS_IOUT_OC_FAULT_LIMIT,
1241 .alarm = "crit_alarm",
1242 .sbit = PB_IOUT_OC_FAULT,
1244 .reg = PMBUS_VIRT_READ_IOUT_AVG,
1248 .reg = PMBUS_VIRT_READ_IOUT_MIN,
1252 .reg = PMBUS_VIRT_READ_IOUT_MAX,
1256 .reg = PMBUS_VIRT_RESET_IOUT_HISTORY,
1257 .attr = "reset_history",
1261 static const struct pmbus_sensor_attr current_attributes[] = {
1263 .reg = PMBUS_READ_IIN,
1264 .class = PSC_CURRENT_IN,
1266 .func = PMBUS_HAVE_IIN,
1267 .sfunc = PMBUS_HAVE_STATUS_INPUT,
1268 .sbase = PB_STATUS_INPUT_BASE,
1269 .limit = iin_limit_attrs,
1270 .nlimit = ARRAY_SIZE(iin_limit_attrs),
1272 .reg = PMBUS_READ_IOUT,
1273 .class = PSC_CURRENT_OUT,
1276 .func = PMBUS_HAVE_IOUT,
1277 .sfunc = PMBUS_HAVE_STATUS_IOUT,
1278 .sbase = PB_STATUS_IOUT_BASE,
1279 .gbit = PB_STATUS_IOUT_OC,
1280 .limit = iout_limit_attrs,
1281 .nlimit = ARRAY_SIZE(iout_limit_attrs),
1285 /* Power attributes */
1287 static const struct pmbus_limit_attr pin_limit_attrs[] = {
1289 .reg = PMBUS_PIN_OP_WARN_LIMIT,
1292 .sbit = PB_PIN_OP_WARNING,
1294 .reg = PMBUS_VIRT_READ_PIN_AVG,
1298 .reg = PMBUS_VIRT_READ_PIN_MAX,
1300 .attr = "input_highest",
1302 .reg = PMBUS_VIRT_RESET_PIN_HISTORY,
1303 .attr = "reset_history",
1307 static const struct pmbus_limit_attr pout_limit_attrs[] = {
1309 .reg = PMBUS_POUT_MAX,
1311 .alarm = "cap_alarm",
1312 .sbit = PB_POWER_LIMITING,
1314 .reg = PMBUS_POUT_OP_WARN_LIMIT,
1316 .alarm = "max_alarm",
1317 .sbit = PB_POUT_OP_WARNING,
1319 .reg = PMBUS_POUT_OP_FAULT_LIMIT,
1321 .alarm = "crit_alarm",
1322 .sbit = PB_POUT_OP_FAULT,
1324 .reg = PMBUS_VIRT_READ_POUT_AVG,
1328 .reg = PMBUS_VIRT_READ_POUT_MAX,
1330 .attr = "input_highest",
1332 .reg = PMBUS_VIRT_RESET_POUT_HISTORY,
1333 .attr = "reset_history",
1337 static const struct pmbus_sensor_attr power_attributes[] = {
1339 .reg = PMBUS_READ_PIN,
1342 .func = PMBUS_HAVE_PIN,
1343 .sfunc = PMBUS_HAVE_STATUS_INPUT,
1344 .sbase = PB_STATUS_INPUT_BASE,
1345 .limit = pin_limit_attrs,
1346 .nlimit = ARRAY_SIZE(pin_limit_attrs),
1348 .reg = PMBUS_READ_POUT,
1352 .func = PMBUS_HAVE_POUT,
1353 .sfunc = PMBUS_HAVE_STATUS_IOUT,
1354 .sbase = PB_STATUS_IOUT_BASE,
1355 .limit = pout_limit_attrs,
1356 .nlimit = ARRAY_SIZE(pout_limit_attrs),
1360 /* Temperature atributes */
1362 static const struct pmbus_limit_attr temp_limit_attrs[] = {
1364 .reg = PMBUS_UT_WARN_LIMIT,
1367 .alarm = "min_alarm",
1368 .sbit = PB_TEMP_UT_WARNING,
1370 .reg = PMBUS_UT_FAULT_LIMIT,
1373 .alarm = "lcrit_alarm",
1374 .sbit = PB_TEMP_UT_FAULT,
1376 .reg = PMBUS_OT_WARN_LIMIT,
1378 .alarm = "max_alarm",
1379 .sbit = PB_TEMP_OT_WARNING,
1381 .reg = PMBUS_OT_FAULT_LIMIT,
1383 .alarm = "crit_alarm",
1384 .sbit = PB_TEMP_OT_FAULT,
1386 .reg = PMBUS_VIRT_READ_TEMP_MIN,
1389 .reg = PMBUS_VIRT_READ_TEMP_AVG,
1392 .reg = PMBUS_VIRT_READ_TEMP_MAX,
1395 .reg = PMBUS_VIRT_RESET_TEMP_HISTORY,
1396 .attr = "reset_history",
1400 static const struct pmbus_limit_attr temp_limit_attrs2[] = {
1402 .reg = PMBUS_UT_WARN_LIMIT,
1405 .alarm = "min_alarm",
1406 .sbit = PB_TEMP_UT_WARNING,
1408 .reg = PMBUS_UT_FAULT_LIMIT,
1411 .alarm = "lcrit_alarm",
1412 .sbit = PB_TEMP_UT_FAULT,
1414 .reg = PMBUS_OT_WARN_LIMIT,
1416 .alarm = "max_alarm",
1417 .sbit = PB_TEMP_OT_WARNING,
1419 .reg = PMBUS_OT_FAULT_LIMIT,
1421 .alarm = "crit_alarm",
1422 .sbit = PB_TEMP_OT_FAULT,
1424 .reg = PMBUS_VIRT_READ_TEMP2_MIN,
1427 .reg = PMBUS_VIRT_READ_TEMP2_AVG,
1430 .reg = PMBUS_VIRT_READ_TEMP2_MAX,
1433 .reg = PMBUS_VIRT_RESET_TEMP2_HISTORY,
1434 .attr = "reset_history",
1438 static const struct pmbus_limit_attr temp_limit_attrs3[] = {
1440 .reg = PMBUS_UT_WARN_LIMIT,
1443 .alarm = "min_alarm",
1444 .sbit = PB_TEMP_UT_WARNING,
1446 .reg = PMBUS_UT_FAULT_LIMIT,
1449 .alarm = "lcrit_alarm",
1450 .sbit = PB_TEMP_UT_FAULT,
1452 .reg = PMBUS_OT_WARN_LIMIT,
1454 .alarm = "max_alarm",
1455 .sbit = PB_TEMP_OT_WARNING,
1457 .reg = PMBUS_OT_FAULT_LIMIT,
1459 .alarm = "crit_alarm",
1460 .sbit = PB_TEMP_OT_FAULT,
1464 static const struct pmbus_sensor_attr temp_attributes[] = {
1466 .reg = PMBUS_READ_TEMPERATURE_1,
1467 .class = PSC_TEMPERATURE,
1471 .func = PMBUS_HAVE_TEMP,
1472 .sfunc = PMBUS_HAVE_STATUS_TEMP,
1473 .sbase = PB_STATUS_TEMP_BASE,
1474 .gbit = PB_STATUS_TEMPERATURE,
1475 .limit = temp_limit_attrs,
1476 .nlimit = ARRAY_SIZE(temp_limit_attrs),
1478 .reg = PMBUS_READ_TEMPERATURE_2,
1479 .class = PSC_TEMPERATURE,
1483 .func = PMBUS_HAVE_TEMP2,
1484 .sfunc = PMBUS_HAVE_STATUS_TEMP,
1485 .sbase = PB_STATUS_TEMP_BASE,
1486 .gbit = PB_STATUS_TEMPERATURE,
1487 .limit = temp_limit_attrs2,
1488 .nlimit = ARRAY_SIZE(temp_limit_attrs2),
1490 .reg = PMBUS_READ_TEMPERATURE_3,
1491 .class = PSC_TEMPERATURE,
1495 .func = PMBUS_HAVE_TEMP3,
1496 .sfunc = PMBUS_HAVE_STATUS_TEMP,
1497 .sbase = PB_STATUS_TEMP_BASE,
1498 .gbit = PB_STATUS_TEMPERATURE,
1499 .limit = temp_limit_attrs3,
1500 .nlimit = ARRAY_SIZE(temp_limit_attrs3),
1504 static const int pmbus_fan_registers[] = {
1505 PMBUS_READ_FAN_SPEED_1,
1506 PMBUS_READ_FAN_SPEED_2,
1507 PMBUS_READ_FAN_SPEED_3,
1508 PMBUS_READ_FAN_SPEED_4
1511 static const int pmbus_fan_config_registers[] = {
1512 PMBUS_FAN_CONFIG_12,
1513 PMBUS_FAN_CONFIG_12,
1514 PMBUS_FAN_CONFIG_34,
1518 static const int pmbus_fan_status_registers[] = {
1519 PMBUS_STATUS_FAN_12,
1520 PMBUS_STATUS_FAN_12,
1521 PMBUS_STATUS_FAN_34,
1525 static const u32 pmbus_fan_flags[] = {
1532 static const u32 pmbus_fan_status_flags[] = {
1533 PMBUS_HAVE_STATUS_FAN12,
1534 PMBUS_HAVE_STATUS_FAN12,
1535 PMBUS_HAVE_STATUS_FAN34,
1536 PMBUS_HAVE_STATUS_FAN34
1540 static int pmbus_add_fan_attributes(struct i2c_client *client,
1541 struct pmbus_data *data)
1543 const struct pmbus_driver_info *info = data->info;
1548 for (page = 0; page < info->pages; page++) {
1551 for (f = 0; f < ARRAY_SIZE(pmbus_fan_registers); f++) {
1554 if (!(info->func[page] & pmbus_fan_flags[f]))
1557 if (!pmbus_check_word_register(client, page,
1558 pmbus_fan_registers[f]))
1562 * Skip fan if not installed.
1563 * Each fan configuration register covers multiple fans,
1564 * so we have to do some magic.
1566 regval = _pmbus_read_byte_data(client, page,
1567 pmbus_fan_config_registers[f]);
1569 (!(regval & (PB_FAN_1_INSTALLED >> ((f & 1) * 4)))))
1572 if (pmbus_add_sensor(data, "fan", "input", index,
1573 page, pmbus_fan_registers[f],
1574 PSC_FAN, true, true) == NULL)
1578 * Each fan status register covers multiple fans,
1579 * so we have to do some magic.
1581 if ((info->func[page] & pmbus_fan_status_flags[f]) &&
1582 pmbus_check_byte_register(client,
1583 page, pmbus_fan_status_registers[f])) {
1586 if (f > 1) /* fan 3, 4 */
1587 base = PB_STATUS_FAN34_BASE + page;
1589 base = PB_STATUS_FAN_BASE + page;
1590 ret = pmbus_add_boolean(data, "fan",
1591 "alarm", index, NULL, NULL, base,
1592 PB_FAN_FAN1_WARNING >> (f & 1));
1595 ret = pmbus_add_boolean(data, "fan",
1596 "fault", index, NULL, NULL, base,
1597 PB_FAN_FAN1_FAULT >> (f & 1));
1607 static int pmbus_find_attributes(struct i2c_client *client,
1608 struct pmbus_data *data)
1612 /* Voltage sensors */
1613 ret = pmbus_add_sensor_attrs(client, data, "in", voltage_attributes,
1614 ARRAY_SIZE(voltage_attributes));
1618 /* Current sensors */
1619 ret = pmbus_add_sensor_attrs(client, data, "curr", current_attributes,
1620 ARRAY_SIZE(current_attributes));
1625 ret = pmbus_add_sensor_attrs(client, data, "power", power_attributes,
1626 ARRAY_SIZE(power_attributes));
1630 /* Temperature sensors */
1631 ret = pmbus_add_sensor_attrs(client, data, "temp", temp_attributes,
1632 ARRAY_SIZE(temp_attributes));
1637 ret = pmbus_add_fan_attributes(client, data);
1642 * Identify chip parameters.
1643 * This function is called for all chips.
1645 static int pmbus_identify_common(struct i2c_client *client,
1646 struct pmbus_data *data)
1650 if (pmbus_check_byte_register(client, 0, PMBUS_VOUT_MODE))
1651 vout_mode = _pmbus_read_byte_data(client, 0, PMBUS_VOUT_MODE);
1652 if (vout_mode >= 0 && vout_mode != 0xff) {
1654 * Not all chips support the VOUT_MODE command,
1655 * so a failure to read it is not an error.
1657 switch (vout_mode >> 5) {
1658 case 0: /* linear mode */
1659 if (data->info->format[PSC_VOLTAGE_OUT] != linear)
1662 data->exponent = ((s8)(vout_mode << 3)) >> 3;
1664 case 1: /* VID mode */
1665 if (data->info->format[PSC_VOLTAGE_OUT] != vid)
1668 case 2: /* direct mode */
1669 if (data->info->format[PSC_VOLTAGE_OUT] != direct)
1677 pmbus_clear_fault_page(client, 0);
1681 static int pmbus_init_common(struct i2c_client *client, struct pmbus_data *data,
1682 struct pmbus_driver_info *info)
1684 struct device *dev = &client->dev;
1688 * Some PMBus chips don't support PMBUS_STATUS_BYTE, so try
1689 * to use PMBUS_STATUS_WORD instead if that is the case.
1690 * Bail out if both registers are not supported.
1692 data->status_register = PMBUS_STATUS_BYTE;
1693 ret = i2c_smbus_read_byte_data(client, PMBUS_STATUS_BYTE);
1694 if (ret < 0 || ret == 0xff) {
1695 data->status_register = PMBUS_STATUS_WORD;
1696 ret = i2c_smbus_read_word_data(client, PMBUS_STATUS_WORD);
1697 if (ret < 0 || ret == 0xffff) {
1698 dev_err(dev, "PMBus status register not found\n");
1703 pmbus_clear_faults(client);
1705 if (info->identify) {
1706 ret = (*info->identify)(client, info);
1708 dev_err(dev, "Chip identification failed\n");
1713 if (info->pages <= 0 || info->pages > PMBUS_PAGES) {
1714 dev_err(dev, "Bad number of PMBus pages: %d\n", info->pages);
1718 ret = pmbus_identify_common(client, data);
1720 dev_err(dev, "Failed to identify chip capabilities\n");
1726 int pmbus_do_probe(struct i2c_client *client, const struct i2c_device_id *id,
1727 struct pmbus_driver_info *info)
1729 struct device *dev = &client->dev;
1730 const struct pmbus_platform_data *pdata = dev_get_platdata(dev);
1731 struct pmbus_data *data;
1737 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE
1738 | I2C_FUNC_SMBUS_BYTE_DATA
1739 | I2C_FUNC_SMBUS_WORD_DATA))
1742 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
1746 i2c_set_clientdata(client, data);
1747 mutex_init(&data->update_lock);
1751 data->flags = pdata->flags;
1754 ret = pmbus_init_common(client, data, info);
1758 ret = pmbus_find_attributes(client, data);
1763 * If there are no attributes, something is wrong.
1764 * Bail out instead of trying to register nothing.
1766 if (!data->num_attributes) {
1767 dev_err(dev, "No attributes found\n");
1772 data->groups[0] = &data->group;
1773 data->hwmon_dev = hwmon_device_register_with_groups(dev, client->name,
1774 data, data->groups);
1775 if (IS_ERR(data->hwmon_dev)) {
1776 ret = PTR_ERR(data->hwmon_dev);
1777 dev_err(dev, "Failed to register hwmon device\n");
1783 kfree(data->group.attrs);
1786 EXPORT_SYMBOL_GPL(pmbus_do_probe);
1788 int pmbus_do_remove(struct i2c_client *client)
1790 struct pmbus_data *data = i2c_get_clientdata(client);
1791 hwmon_device_unregister(data->hwmon_dev);
1792 kfree(data->group.attrs);
1795 EXPORT_SYMBOL_GPL(pmbus_do_remove);
1797 MODULE_AUTHOR("Guenter Roeck");
1798 MODULE_DESCRIPTION("PMBus core driver");
1799 MODULE_LICENSE("GPL");