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;
101 struct pmbus_sensor *sensors;
103 struct mutex update_lock;
105 unsigned long last_updated; /* in jiffies */
108 * A single status register covers multiple attributes,
109 * so we keep them all together.
111 u8 status[PB_NUM_STATUS_REG];
117 void pmbus_clear_cache(struct i2c_client *client)
119 struct pmbus_data *data = i2c_get_clientdata(client);
123 EXPORT_SYMBOL_GPL(pmbus_clear_cache);
125 int pmbus_set_page(struct i2c_client *client, u8 page)
127 struct pmbus_data *data = i2c_get_clientdata(client);
131 if (page != data->currpage) {
132 rv = i2c_smbus_write_byte_data(client, PMBUS_PAGE, page);
133 newpage = i2c_smbus_read_byte_data(client, PMBUS_PAGE);
137 data->currpage = page;
141 EXPORT_SYMBOL_GPL(pmbus_set_page);
143 int pmbus_write_byte(struct i2c_client *client, int page, u8 value)
148 rv = pmbus_set_page(client, page);
153 return i2c_smbus_write_byte(client, value);
155 EXPORT_SYMBOL_GPL(pmbus_write_byte);
158 * _pmbus_write_byte() is similar to pmbus_write_byte(), but checks if
159 * a device specific mapping funcion exists and calls it if necessary.
161 static int _pmbus_write_byte(struct i2c_client *client, int page, u8 value)
163 struct pmbus_data *data = i2c_get_clientdata(client);
164 const struct pmbus_driver_info *info = data->info;
167 if (info->write_byte) {
168 status = info->write_byte(client, page, value);
169 if (status != -ENODATA)
172 return pmbus_write_byte(client, page, value);
175 int pmbus_write_word_data(struct i2c_client *client, u8 page, u8 reg, u16 word)
179 rv = pmbus_set_page(client, page);
183 return i2c_smbus_write_word_data(client, reg, word);
185 EXPORT_SYMBOL_GPL(pmbus_write_word_data);
188 * _pmbus_write_word_data() is similar to pmbus_write_word_data(), but checks if
189 * a device specific mapping function exists and calls it if necessary.
191 static int _pmbus_write_word_data(struct i2c_client *client, int page, int reg,
194 struct pmbus_data *data = i2c_get_clientdata(client);
195 const struct pmbus_driver_info *info = data->info;
198 if (info->write_word_data) {
199 status = info->write_word_data(client, page, reg, word);
200 if (status != -ENODATA)
203 if (reg >= PMBUS_VIRT_BASE)
205 return pmbus_write_word_data(client, page, reg, word);
208 int pmbus_read_word_data(struct i2c_client *client, u8 page, u8 reg)
212 rv = pmbus_set_page(client, page);
216 return i2c_smbus_read_word_data(client, reg);
218 EXPORT_SYMBOL_GPL(pmbus_read_word_data);
221 * _pmbus_read_word_data() is similar to pmbus_read_word_data(), but checks if
222 * a device specific mapping function exists and calls it if necessary.
224 static int _pmbus_read_word_data(struct i2c_client *client, int page, int reg)
226 struct pmbus_data *data = i2c_get_clientdata(client);
227 const struct pmbus_driver_info *info = data->info;
230 if (info->read_word_data) {
231 status = info->read_word_data(client, page, reg);
232 if (status != -ENODATA)
235 if (reg >= PMBUS_VIRT_BASE)
237 return pmbus_read_word_data(client, page, reg);
240 int pmbus_read_byte_data(struct i2c_client *client, int page, u8 reg)
245 rv = pmbus_set_page(client, page);
250 return i2c_smbus_read_byte_data(client, reg);
252 EXPORT_SYMBOL_GPL(pmbus_read_byte_data);
255 * _pmbus_read_byte_data() is similar to pmbus_read_byte_data(), but checks if
256 * a device specific mapping function exists and calls it if necessary.
258 static int _pmbus_read_byte_data(struct i2c_client *client, int page, int reg)
260 struct pmbus_data *data = i2c_get_clientdata(client);
261 const struct pmbus_driver_info *info = data->info;
264 if (info->read_byte_data) {
265 status = info->read_byte_data(client, page, reg);
266 if (status != -ENODATA)
269 return pmbus_read_byte_data(client, page, reg);
272 static void pmbus_clear_fault_page(struct i2c_client *client, int page)
274 _pmbus_write_byte(client, page, PMBUS_CLEAR_FAULTS);
277 void pmbus_clear_faults(struct i2c_client *client)
279 struct pmbus_data *data = i2c_get_clientdata(client);
282 for (i = 0; i < data->info->pages; i++)
283 pmbus_clear_fault_page(client, i);
285 EXPORT_SYMBOL_GPL(pmbus_clear_faults);
287 static int pmbus_check_status_cml(struct i2c_client *client)
289 struct pmbus_data *data = i2c_get_clientdata(client);
292 status = _pmbus_read_byte_data(client, -1, data->status_register);
293 if (status < 0 || (status & PB_STATUS_CML)) {
294 status2 = _pmbus_read_byte_data(client, -1, PMBUS_STATUS_CML);
295 if (status2 < 0 || (status2 & PB_CML_FAULT_INVALID_COMMAND))
301 static bool pmbus_check_register(struct i2c_client *client,
302 int (*func)(struct i2c_client *client,
307 struct pmbus_data *data = i2c_get_clientdata(client);
309 rv = func(client, page, reg);
310 if (rv >= 0 && !(data->flags & PMBUS_SKIP_STATUS_CHECK))
311 rv = pmbus_check_status_cml(client);
312 pmbus_clear_fault_page(client, -1);
316 bool pmbus_check_byte_register(struct i2c_client *client, int page, int reg)
318 return pmbus_check_register(client, _pmbus_read_byte_data, page, reg);
320 EXPORT_SYMBOL_GPL(pmbus_check_byte_register);
322 bool pmbus_check_word_register(struct i2c_client *client, int page, int reg)
324 return pmbus_check_register(client, _pmbus_read_word_data, page, reg);
326 EXPORT_SYMBOL_GPL(pmbus_check_word_register);
328 const struct pmbus_driver_info *pmbus_get_driver_info(struct i2c_client *client)
330 struct pmbus_data *data = i2c_get_clientdata(client);
334 EXPORT_SYMBOL_GPL(pmbus_get_driver_info);
336 static struct _pmbus_status {
341 { PMBUS_HAVE_STATUS_VOUT, PB_STATUS_VOUT_BASE, PMBUS_STATUS_VOUT },
342 { PMBUS_HAVE_STATUS_IOUT, PB_STATUS_IOUT_BASE, PMBUS_STATUS_IOUT },
343 { PMBUS_HAVE_STATUS_TEMP, PB_STATUS_TEMP_BASE,
344 PMBUS_STATUS_TEMPERATURE },
345 { PMBUS_HAVE_STATUS_FAN12, PB_STATUS_FAN_BASE, PMBUS_STATUS_FAN_12 },
346 { PMBUS_HAVE_STATUS_FAN34, PB_STATUS_FAN34_BASE, PMBUS_STATUS_FAN_34 },
349 static struct pmbus_data *pmbus_update_device(struct device *dev)
351 struct i2c_client *client = to_i2c_client(dev);
352 struct pmbus_data *data = i2c_get_clientdata(client);
353 const struct pmbus_driver_info *info = data->info;
354 struct pmbus_sensor *sensor;
356 mutex_lock(&data->update_lock);
357 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
360 for (i = 0; i < info->pages; i++) {
361 data->status[PB_STATUS_BASE + i]
362 = _pmbus_read_byte_data(client, i,
363 data->status_register);
364 for (j = 0; j < ARRAY_SIZE(pmbus_status); j++) {
365 struct _pmbus_status *s = &pmbus_status[j];
367 if (!(info->func[i] & s->func))
369 data->status[s->base + i]
370 = _pmbus_read_byte_data(client, i,
375 if (info->func[0] & PMBUS_HAVE_STATUS_INPUT)
376 data->status[PB_STATUS_INPUT_BASE]
377 = _pmbus_read_byte_data(client, 0,
380 if (info->func[0] & PMBUS_HAVE_STATUS_VMON)
381 data->status[PB_STATUS_VMON_BASE]
382 = _pmbus_read_byte_data(client, 0,
383 PMBUS_VIRT_STATUS_VMON);
385 for (sensor = data->sensors; sensor; sensor = sensor->next) {
386 if (!data->valid || sensor->update)
388 = _pmbus_read_word_data(client,
392 pmbus_clear_faults(client);
393 data->last_updated = jiffies;
396 mutex_unlock(&data->update_lock);
401 * Convert linear sensor values to milli- or micro-units
402 * depending on sensor type.
404 static long pmbus_reg2data_linear(struct pmbus_data *data,
405 struct pmbus_sensor *sensor)
411 if (sensor->class == PSC_VOLTAGE_OUT) { /* LINEAR16 */
412 exponent = data->exponent;
413 mantissa = (u16) sensor->data;
414 } else { /* LINEAR11 */
415 exponent = ((s16)sensor->data) >> 11;
416 mantissa = ((s16)((sensor->data & 0x7ff) << 5)) >> 5;
421 /* scale result to milli-units for all sensors except fans */
422 if (sensor->class != PSC_FAN)
425 /* scale result to micro-units for power sensors */
426 if (sensor->class == PSC_POWER)
438 * Convert direct sensor values to milli- or micro-units
439 * depending on sensor type.
441 static long pmbus_reg2data_direct(struct pmbus_data *data,
442 struct pmbus_sensor *sensor)
444 long val = (s16) sensor->data;
447 m = data->info->m[sensor->class];
448 b = data->info->b[sensor->class];
449 R = data->info->R[sensor->class];
454 /* X = 1/m * (Y * 10^-R - b) */
456 /* scale result to milli-units for everything but fans */
457 if (sensor->class != PSC_FAN) {
462 /* scale result to micro-units for power sensors */
463 if (sensor->class == PSC_POWER) {
473 val = DIV_ROUND_CLOSEST(val, 10);
477 return (val - b) / m;
481 * Convert VID sensor values to milli- or micro-units
482 * depending on sensor type.
483 * We currently only support VR11.
485 static long pmbus_reg2data_vid(struct pmbus_data *data,
486 struct pmbus_sensor *sensor)
488 long val = sensor->data;
490 if (val < 0x02 || val > 0xb2)
492 return DIV_ROUND_CLOSEST(160000 - (val - 2) * 625, 100);
495 static long pmbus_reg2data(struct pmbus_data *data, struct pmbus_sensor *sensor)
499 switch (data->info->format[sensor->class]) {
501 val = pmbus_reg2data_direct(data, sensor);
504 val = pmbus_reg2data_vid(data, sensor);
508 val = pmbus_reg2data_linear(data, sensor);
514 #define MAX_MANTISSA (1023 * 1000)
515 #define MIN_MANTISSA (511 * 1000)
517 static u16 pmbus_data2reg_linear(struct pmbus_data *data,
518 enum pmbus_sensor_classes class, long val)
520 s16 exponent = 0, mantissa;
521 bool negative = false;
527 if (class == PSC_VOLTAGE_OUT) {
528 /* LINEAR16 does not support negative voltages */
533 * For a static exponents, we don't have a choice
534 * but to adjust the value to it.
536 if (data->exponent < 0)
537 val <<= -data->exponent;
539 val >>= data->exponent;
540 val = DIV_ROUND_CLOSEST(val, 1000);
549 /* Power is in uW. Convert to mW before converting. */
550 if (class == PSC_POWER)
551 val = DIV_ROUND_CLOSEST(val, 1000L);
554 * For simplicity, convert fan data to milli-units
555 * before calculating the exponent.
557 if (class == PSC_FAN)
560 /* Reduce large mantissa until it fits into 10 bit */
561 while (val >= MAX_MANTISSA && exponent < 15) {
565 /* Increase small mantissa to improve precision */
566 while (val < MIN_MANTISSA && exponent > -15) {
571 /* Convert mantissa from milli-units to units */
572 mantissa = DIV_ROUND_CLOSEST(val, 1000);
574 /* Ensure that resulting number is within range */
575 if (mantissa > 0x3ff)
580 mantissa = -mantissa;
582 /* Convert to 5 bit exponent, 11 bit mantissa */
583 return (mantissa & 0x7ff) | ((exponent << 11) & 0xf800);
586 static u16 pmbus_data2reg_direct(struct pmbus_data *data,
587 enum pmbus_sensor_classes class, long val)
591 m = data->info->m[class];
592 b = data->info->b[class];
593 R = data->info->R[class];
595 /* Power is in uW. Adjust R and b. */
596 if (class == PSC_POWER) {
601 /* Calculate Y = (m * X + b) * 10^R */
602 if (class != PSC_FAN) {
603 R -= 3; /* Adjust R and b for data in milli-units */
613 val = DIV_ROUND_CLOSEST(val, 10);
620 static u16 pmbus_data2reg_vid(struct pmbus_data *data,
621 enum pmbus_sensor_classes class, long val)
623 val = clamp_val(val, 500, 1600);
625 return 2 + DIV_ROUND_CLOSEST((1600 - val) * 100, 625);
628 static u16 pmbus_data2reg(struct pmbus_data *data,
629 enum pmbus_sensor_classes class, long val)
633 switch (data->info->format[class]) {
635 regval = pmbus_data2reg_direct(data, class, val);
638 regval = pmbus_data2reg_vid(data, class, val);
642 regval = pmbus_data2reg_linear(data, class, val);
649 * Return boolean calculated from converted data.
650 * <index> defines a status register index and mask.
651 * The mask is in the lower 8 bits, the register index is in bits 8..23.
653 * The associated pmbus_boolean structure contains optional pointers to two
654 * sensor attributes. If specified, those attributes are compared against each
655 * other to determine if a limit has been exceeded.
657 * If the sensor attribute pointers are NULL, the function returns true if
658 * (status[reg] & mask) is true.
660 * If sensor attribute pointers are provided, a comparison against a specified
661 * limit has to be performed to determine the boolean result.
662 * In this case, the function returns true if v1 >= v2 (where v1 and v2 are
663 * sensor values referenced by sensor attribute pointers s1 and s2).
665 * To determine if an object exceeds upper limits, specify <s1,s2> = <v,limit>.
666 * To determine if an object exceeds lower limits, specify <s1,s2> = <limit,v>.
668 * If a negative value is stored in any of the referenced registers, this value
669 * reflects an error code which will be returned.
671 static int pmbus_get_boolean(struct pmbus_data *data, struct pmbus_boolean *b,
674 struct pmbus_sensor *s1 = b->s1;
675 struct pmbus_sensor *s2 = b->s2;
676 u16 reg = (index >> 8) & 0xffff;
677 u8 mask = index & 0xff;
681 status = data->status[reg];
685 regval = status & mask;
688 } else if (!s1 || !s2) {
699 v1 = pmbus_reg2data(data, s1);
700 v2 = pmbus_reg2data(data, s2);
701 ret = !!(regval && v1 >= v2);
706 static ssize_t pmbus_show_boolean(struct device *dev,
707 struct device_attribute *da, char *buf)
709 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
710 struct pmbus_boolean *boolean = to_pmbus_boolean(attr);
711 struct pmbus_data *data = pmbus_update_device(dev);
714 val = pmbus_get_boolean(data, boolean, attr->index);
717 return snprintf(buf, PAGE_SIZE, "%d\n", val);
720 static ssize_t pmbus_show_sensor(struct device *dev,
721 struct device_attribute *devattr, char *buf)
723 struct pmbus_data *data = pmbus_update_device(dev);
724 struct pmbus_sensor *sensor = to_pmbus_sensor(devattr);
726 if (sensor->data < 0)
729 return snprintf(buf, PAGE_SIZE, "%ld\n", pmbus_reg2data(data, sensor));
732 static ssize_t pmbus_set_sensor(struct device *dev,
733 struct device_attribute *devattr,
734 const char *buf, size_t count)
736 struct i2c_client *client = to_i2c_client(dev);
737 struct pmbus_data *data = i2c_get_clientdata(client);
738 struct pmbus_sensor *sensor = to_pmbus_sensor(devattr);
744 if (kstrtol(buf, 10, &val) < 0)
747 mutex_lock(&data->update_lock);
748 regval = pmbus_data2reg(data, sensor->class, val);
749 ret = _pmbus_write_word_data(client, sensor->page, sensor->reg, regval);
753 sensor->data = regval;
754 mutex_unlock(&data->update_lock);
758 static ssize_t pmbus_show_label(struct device *dev,
759 struct device_attribute *da, char *buf)
761 struct pmbus_label *label = to_pmbus_label(da);
763 return snprintf(buf, PAGE_SIZE, "%s\n", label->label);
766 static int pmbus_add_attribute(struct pmbus_data *data, struct attribute *attr)
768 if (data->num_attributes >= data->max_attributes - 1) {
769 int new_max_attrs = data->max_attributes + PMBUS_ATTR_ALLOC_SIZE;
770 void *new_attrs = krealloc(data->group.attrs,
771 new_max_attrs * sizeof(void *),
775 data->group.attrs = new_attrs;
776 data->max_attributes = new_max_attrs;
779 data->group.attrs[data->num_attributes++] = attr;
780 data->group.attrs[data->num_attributes] = NULL;
784 static void pmbus_dev_attr_init(struct device_attribute *dev_attr,
787 ssize_t (*show)(struct device *dev,
788 struct device_attribute *attr,
790 ssize_t (*store)(struct device *dev,
791 struct device_attribute *attr,
792 const char *buf, size_t count))
794 sysfs_attr_init(&dev_attr->attr);
795 dev_attr->attr.name = name;
796 dev_attr->attr.mode = mode;
797 dev_attr->show = show;
798 dev_attr->store = store;
801 static void pmbus_attr_init(struct sensor_device_attribute *a,
804 ssize_t (*show)(struct device *dev,
805 struct device_attribute *attr,
807 ssize_t (*store)(struct device *dev,
808 struct device_attribute *attr,
809 const char *buf, size_t count),
812 pmbus_dev_attr_init(&a->dev_attr, name, mode, show, store);
816 static int pmbus_add_boolean(struct pmbus_data *data,
817 const char *name, const char *type, int seq,
818 struct pmbus_sensor *s1,
819 struct pmbus_sensor *s2,
822 struct pmbus_boolean *boolean;
823 struct sensor_device_attribute *a;
825 boolean = devm_kzalloc(data->dev, sizeof(*boolean), GFP_KERNEL);
829 a = &boolean->attribute;
831 snprintf(boolean->name, sizeof(boolean->name), "%s%d_%s",
835 pmbus_attr_init(a, boolean->name, S_IRUGO, pmbus_show_boolean, NULL,
838 return pmbus_add_attribute(data, &a->dev_attr.attr);
841 static struct pmbus_sensor *pmbus_add_sensor(struct pmbus_data *data,
842 const char *name, const char *type,
843 int seq, int page, int reg,
844 enum pmbus_sensor_classes class,
845 bool update, bool readonly)
847 struct pmbus_sensor *sensor;
848 struct device_attribute *a;
850 sensor = devm_kzalloc(data->dev, sizeof(*sensor), GFP_KERNEL);
853 a = &sensor->attribute;
855 snprintf(sensor->name, sizeof(sensor->name), "%s%d_%s",
859 sensor->class = class;
860 sensor->update = update;
861 pmbus_dev_attr_init(a, sensor->name,
862 readonly ? S_IRUGO : S_IRUGO | S_IWUSR,
863 pmbus_show_sensor, pmbus_set_sensor);
865 if (pmbus_add_attribute(data, &a->attr))
868 sensor->next = data->sensors;
869 data->sensors = sensor;
874 static int pmbus_add_label(struct pmbus_data *data,
875 const char *name, int seq,
876 const char *lstring, int index)
878 struct pmbus_label *label;
879 struct device_attribute *a;
881 label = devm_kzalloc(data->dev, sizeof(*label), GFP_KERNEL);
885 a = &label->attribute;
887 snprintf(label->name, sizeof(label->name), "%s%d_label", name, seq);
889 strncpy(label->label, lstring, sizeof(label->label) - 1);
891 snprintf(label->label, sizeof(label->label), "%s%d", lstring,
894 pmbus_dev_attr_init(a, label->name, S_IRUGO, pmbus_show_label, NULL);
895 return pmbus_add_attribute(data, &a->attr);
899 * Search for attributes. Allocate sensors, booleans, and labels as needed.
903 * The pmbus_limit_attr structure describes a single limit attribute
904 * and its associated alarm attribute.
906 struct pmbus_limit_attr {
907 u16 reg; /* Limit register */
908 u16 sbit; /* Alarm attribute status bit */
909 bool update; /* True if register needs updates */
910 bool low; /* True if low limit; for limits with compare
912 const char *attr; /* Attribute name */
913 const char *alarm; /* Alarm attribute name */
917 * The pmbus_sensor_attr structure describes one sensor attribute. This
918 * description includes a reference to the associated limit attributes.
920 struct pmbus_sensor_attr {
921 u16 reg; /* sensor register */
922 u8 gbit; /* generic status bit */
923 u8 nlimit; /* # of limit registers */
924 enum pmbus_sensor_classes class;/* sensor class */
925 const char *label; /* sensor label */
926 bool paged; /* true if paged sensor */
927 bool update; /* true if update needed */
928 bool compare; /* true if compare function needed */
929 u32 func; /* sensor mask */
930 u32 sfunc; /* sensor status mask */
931 int sbase; /* status base register */
932 const struct pmbus_limit_attr *limit;/* limit registers */
936 * Add a set of limit attributes and, if supported, the associated
938 * returns 0 if no alarm register found, 1 if an alarm register was found,
941 static int pmbus_add_limit_attrs(struct i2c_client *client,
942 struct pmbus_data *data,
943 const struct pmbus_driver_info *info,
944 const char *name, int index, int page,
945 struct pmbus_sensor *base,
946 const struct pmbus_sensor_attr *attr)
948 const struct pmbus_limit_attr *l = attr->limit;
949 int nlimit = attr->nlimit;
952 struct pmbus_sensor *curr;
954 for (i = 0; i < nlimit; i++) {
955 if (pmbus_check_word_register(client, page, l->reg)) {
956 curr = pmbus_add_sensor(data, name, l->attr, index,
957 page, l->reg, attr->class,
958 attr->update || l->update,
962 if (l->sbit && (info->func[page] & attr->sfunc)) {
963 ret = pmbus_add_boolean(data, name,
965 attr->compare ? l->low ? curr : base
967 attr->compare ? l->low ? base : curr
969 attr->sbase + page, l->sbit);
980 static int pmbus_add_sensor_attrs_one(struct i2c_client *client,
981 struct pmbus_data *data,
982 const struct pmbus_driver_info *info,
985 const struct pmbus_sensor_attr *attr)
987 struct pmbus_sensor *base;
991 ret = pmbus_add_label(data, name, index, attr->label,
992 attr->paged ? page + 1 : 0);
996 base = pmbus_add_sensor(data, name, "input", index, page, attr->reg,
997 attr->class, true, true);
1001 ret = pmbus_add_limit_attrs(client, data, info, name,
1002 index, page, base, attr);
1006 * Add generic alarm attribute only if there are no individual
1007 * alarm attributes, if there is a global alarm bit, and if
1008 * the generic status register for this page is accessible.
1010 if (!ret && attr->gbit &&
1011 pmbus_check_byte_register(client, page,
1012 data->status_register)) {
1013 ret = pmbus_add_boolean(data, name, "alarm", index,
1015 PB_STATUS_BASE + page,
1024 static int pmbus_add_sensor_attrs(struct i2c_client *client,
1025 struct pmbus_data *data,
1027 const struct pmbus_sensor_attr *attrs,
1030 const struct pmbus_driver_info *info = data->info;
1035 for (i = 0; i < nattrs; i++) {
1038 pages = attrs->paged ? info->pages : 1;
1039 for (page = 0; page < pages; page++) {
1040 if (!(info->func[page] & attrs->func))
1042 ret = pmbus_add_sensor_attrs_one(client, data, info,
1054 static const struct pmbus_limit_attr vin_limit_attrs[] = {
1056 .reg = PMBUS_VIN_UV_WARN_LIMIT,
1058 .alarm = "min_alarm",
1059 .sbit = PB_VOLTAGE_UV_WARNING,
1061 .reg = PMBUS_VIN_UV_FAULT_LIMIT,
1063 .alarm = "lcrit_alarm",
1064 .sbit = PB_VOLTAGE_UV_FAULT,
1066 .reg = PMBUS_VIN_OV_WARN_LIMIT,
1068 .alarm = "max_alarm",
1069 .sbit = PB_VOLTAGE_OV_WARNING,
1071 .reg = PMBUS_VIN_OV_FAULT_LIMIT,
1073 .alarm = "crit_alarm",
1074 .sbit = PB_VOLTAGE_OV_FAULT,
1076 .reg = PMBUS_VIRT_READ_VIN_AVG,
1080 .reg = PMBUS_VIRT_READ_VIN_MIN,
1084 .reg = PMBUS_VIRT_READ_VIN_MAX,
1088 .reg = PMBUS_VIRT_RESET_VIN_HISTORY,
1089 .attr = "reset_history",
1093 static const struct pmbus_limit_attr vmon_limit_attrs[] = {
1095 .reg = PMBUS_VIRT_VMON_UV_WARN_LIMIT,
1097 .alarm = "min_alarm",
1098 .sbit = PB_VOLTAGE_UV_WARNING,
1100 .reg = PMBUS_VIRT_VMON_UV_FAULT_LIMIT,
1102 .alarm = "lcrit_alarm",
1103 .sbit = PB_VOLTAGE_UV_FAULT,
1105 .reg = PMBUS_VIRT_VMON_OV_WARN_LIMIT,
1107 .alarm = "max_alarm",
1108 .sbit = PB_VOLTAGE_OV_WARNING,
1110 .reg = PMBUS_VIRT_VMON_OV_FAULT_LIMIT,
1112 .alarm = "crit_alarm",
1113 .sbit = PB_VOLTAGE_OV_FAULT,
1117 static const struct pmbus_limit_attr vout_limit_attrs[] = {
1119 .reg = PMBUS_VOUT_UV_WARN_LIMIT,
1121 .alarm = "min_alarm",
1122 .sbit = PB_VOLTAGE_UV_WARNING,
1124 .reg = PMBUS_VOUT_UV_FAULT_LIMIT,
1126 .alarm = "lcrit_alarm",
1127 .sbit = PB_VOLTAGE_UV_FAULT,
1129 .reg = PMBUS_VOUT_OV_WARN_LIMIT,
1131 .alarm = "max_alarm",
1132 .sbit = PB_VOLTAGE_OV_WARNING,
1134 .reg = PMBUS_VOUT_OV_FAULT_LIMIT,
1136 .alarm = "crit_alarm",
1137 .sbit = PB_VOLTAGE_OV_FAULT,
1139 .reg = PMBUS_VIRT_READ_VOUT_AVG,
1143 .reg = PMBUS_VIRT_READ_VOUT_MIN,
1147 .reg = PMBUS_VIRT_READ_VOUT_MAX,
1151 .reg = PMBUS_VIRT_RESET_VOUT_HISTORY,
1152 .attr = "reset_history",
1156 static const struct pmbus_sensor_attr voltage_attributes[] = {
1158 .reg = PMBUS_READ_VIN,
1159 .class = PSC_VOLTAGE_IN,
1161 .func = PMBUS_HAVE_VIN,
1162 .sfunc = PMBUS_HAVE_STATUS_INPUT,
1163 .sbase = PB_STATUS_INPUT_BASE,
1164 .gbit = PB_STATUS_VIN_UV,
1165 .limit = vin_limit_attrs,
1166 .nlimit = ARRAY_SIZE(vin_limit_attrs),
1168 .reg = PMBUS_VIRT_READ_VMON,
1169 .class = PSC_VOLTAGE_IN,
1171 .func = PMBUS_HAVE_VMON,
1172 .sfunc = PMBUS_HAVE_STATUS_VMON,
1173 .sbase = PB_STATUS_VMON_BASE,
1174 .limit = vmon_limit_attrs,
1175 .nlimit = ARRAY_SIZE(vmon_limit_attrs),
1177 .reg = PMBUS_READ_VCAP,
1178 .class = PSC_VOLTAGE_IN,
1180 .func = PMBUS_HAVE_VCAP,
1182 .reg = PMBUS_READ_VOUT,
1183 .class = PSC_VOLTAGE_OUT,
1186 .func = PMBUS_HAVE_VOUT,
1187 .sfunc = PMBUS_HAVE_STATUS_VOUT,
1188 .sbase = PB_STATUS_VOUT_BASE,
1189 .gbit = PB_STATUS_VOUT_OV,
1190 .limit = vout_limit_attrs,
1191 .nlimit = ARRAY_SIZE(vout_limit_attrs),
1195 /* Current attributes */
1197 static const struct pmbus_limit_attr iin_limit_attrs[] = {
1199 .reg = PMBUS_IIN_OC_WARN_LIMIT,
1201 .alarm = "max_alarm",
1202 .sbit = PB_IIN_OC_WARNING,
1204 .reg = PMBUS_IIN_OC_FAULT_LIMIT,
1206 .alarm = "crit_alarm",
1207 .sbit = PB_IIN_OC_FAULT,
1209 .reg = PMBUS_VIRT_READ_IIN_AVG,
1213 .reg = PMBUS_VIRT_READ_IIN_MIN,
1217 .reg = PMBUS_VIRT_READ_IIN_MAX,
1221 .reg = PMBUS_VIRT_RESET_IIN_HISTORY,
1222 .attr = "reset_history",
1226 static const struct pmbus_limit_attr iout_limit_attrs[] = {
1228 .reg = PMBUS_IOUT_OC_WARN_LIMIT,
1230 .alarm = "max_alarm",
1231 .sbit = PB_IOUT_OC_WARNING,
1233 .reg = PMBUS_IOUT_UC_FAULT_LIMIT,
1235 .alarm = "lcrit_alarm",
1236 .sbit = PB_IOUT_UC_FAULT,
1238 .reg = PMBUS_IOUT_OC_FAULT_LIMIT,
1240 .alarm = "crit_alarm",
1241 .sbit = PB_IOUT_OC_FAULT,
1243 .reg = PMBUS_VIRT_READ_IOUT_AVG,
1247 .reg = PMBUS_VIRT_READ_IOUT_MIN,
1251 .reg = PMBUS_VIRT_READ_IOUT_MAX,
1255 .reg = PMBUS_VIRT_RESET_IOUT_HISTORY,
1256 .attr = "reset_history",
1260 static const struct pmbus_sensor_attr current_attributes[] = {
1262 .reg = PMBUS_READ_IIN,
1263 .class = PSC_CURRENT_IN,
1265 .func = PMBUS_HAVE_IIN,
1266 .sfunc = PMBUS_HAVE_STATUS_INPUT,
1267 .sbase = PB_STATUS_INPUT_BASE,
1268 .limit = iin_limit_attrs,
1269 .nlimit = ARRAY_SIZE(iin_limit_attrs),
1271 .reg = PMBUS_READ_IOUT,
1272 .class = PSC_CURRENT_OUT,
1275 .func = PMBUS_HAVE_IOUT,
1276 .sfunc = PMBUS_HAVE_STATUS_IOUT,
1277 .sbase = PB_STATUS_IOUT_BASE,
1278 .gbit = PB_STATUS_IOUT_OC,
1279 .limit = iout_limit_attrs,
1280 .nlimit = ARRAY_SIZE(iout_limit_attrs),
1284 /* Power attributes */
1286 static const struct pmbus_limit_attr pin_limit_attrs[] = {
1288 .reg = PMBUS_PIN_OP_WARN_LIMIT,
1291 .sbit = PB_PIN_OP_WARNING,
1293 .reg = PMBUS_VIRT_READ_PIN_AVG,
1297 .reg = PMBUS_VIRT_READ_PIN_MAX,
1299 .attr = "input_highest",
1301 .reg = PMBUS_VIRT_RESET_PIN_HISTORY,
1302 .attr = "reset_history",
1306 static const struct pmbus_limit_attr pout_limit_attrs[] = {
1308 .reg = PMBUS_POUT_MAX,
1310 .alarm = "cap_alarm",
1311 .sbit = PB_POWER_LIMITING,
1313 .reg = PMBUS_POUT_OP_WARN_LIMIT,
1315 .alarm = "max_alarm",
1316 .sbit = PB_POUT_OP_WARNING,
1318 .reg = PMBUS_POUT_OP_FAULT_LIMIT,
1320 .alarm = "crit_alarm",
1321 .sbit = PB_POUT_OP_FAULT,
1323 .reg = PMBUS_VIRT_READ_POUT_AVG,
1327 .reg = PMBUS_VIRT_READ_POUT_MAX,
1329 .attr = "input_highest",
1331 .reg = PMBUS_VIRT_RESET_POUT_HISTORY,
1332 .attr = "reset_history",
1336 static const struct pmbus_sensor_attr power_attributes[] = {
1338 .reg = PMBUS_READ_PIN,
1341 .func = PMBUS_HAVE_PIN,
1342 .sfunc = PMBUS_HAVE_STATUS_INPUT,
1343 .sbase = PB_STATUS_INPUT_BASE,
1344 .limit = pin_limit_attrs,
1345 .nlimit = ARRAY_SIZE(pin_limit_attrs),
1347 .reg = PMBUS_READ_POUT,
1351 .func = PMBUS_HAVE_POUT,
1352 .sfunc = PMBUS_HAVE_STATUS_IOUT,
1353 .sbase = PB_STATUS_IOUT_BASE,
1354 .limit = pout_limit_attrs,
1355 .nlimit = ARRAY_SIZE(pout_limit_attrs),
1359 /* Temperature atributes */
1361 static const struct pmbus_limit_attr temp_limit_attrs[] = {
1363 .reg = PMBUS_UT_WARN_LIMIT,
1366 .alarm = "min_alarm",
1367 .sbit = PB_TEMP_UT_WARNING,
1369 .reg = PMBUS_UT_FAULT_LIMIT,
1372 .alarm = "lcrit_alarm",
1373 .sbit = PB_TEMP_UT_FAULT,
1375 .reg = PMBUS_OT_WARN_LIMIT,
1377 .alarm = "max_alarm",
1378 .sbit = PB_TEMP_OT_WARNING,
1380 .reg = PMBUS_OT_FAULT_LIMIT,
1382 .alarm = "crit_alarm",
1383 .sbit = PB_TEMP_OT_FAULT,
1385 .reg = PMBUS_VIRT_READ_TEMP_MIN,
1388 .reg = PMBUS_VIRT_READ_TEMP_AVG,
1391 .reg = PMBUS_VIRT_READ_TEMP_MAX,
1394 .reg = PMBUS_VIRT_RESET_TEMP_HISTORY,
1395 .attr = "reset_history",
1399 static const struct pmbus_limit_attr temp_limit_attrs2[] = {
1401 .reg = PMBUS_UT_WARN_LIMIT,
1404 .alarm = "min_alarm",
1405 .sbit = PB_TEMP_UT_WARNING,
1407 .reg = PMBUS_UT_FAULT_LIMIT,
1410 .alarm = "lcrit_alarm",
1411 .sbit = PB_TEMP_UT_FAULT,
1413 .reg = PMBUS_OT_WARN_LIMIT,
1415 .alarm = "max_alarm",
1416 .sbit = PB_TEMP_OT_WARNING,
1418 .reg = PMBUS_OT_FAULT_LIMIT,
1420 .alarm = "crit_alarm",
1421 .sbit = PB_TEMP_OT_FAULT,
1423 .reg = PMBUS_VIRT_READ_TEMP2_MIN,
1426 .reg = PMBUS_VIRT_READ_TEMP2_AVG,
1429 .reg = PMBUS_VIRT_READ_TEMP2_MAX,
1432 .reg = PMBUS_VIRT_RESET_TEMP2_HISTORY,
1433 .attr = "reset_history",
1437 static const struct pmbus_limit_attr temp_limit_attrs3[] = {
1439 .reg = PMBUS_UT_WARN_LIMIT,
1442 .alarm = "min_alarm",
1443 .sbit = PB_TEMP_UT_WARNING,
1445 .reg = PMBUS_UT_FAULT_LIMIT,
1448 .alarm = "lcrit_alarm",
1449 .sbit = PB_TEMP_UT_FAULT,
1451 .reg = PMBUS_OT_WARN_LIMIT,
1453 .alarm = "max_alarm",
1454 .sbit = PB_TEMP_OT_WARNING,
1456 .reg = PMBUS_OT_FAULT_LIMIT,
1458 .alarm = "crit_alarm",
1459 .sbit = PB_TEMP_OT_FAULT,
1463 static const struct pmbus_sensor_attr temp_attributes[] = {
1465 .reg = PMBUS_READ_TEMPERATURE_1,
1466 .class = PSC_TEMPERATURE,
1470 .func = PMBUS_HAVE_TEMP,
1471 .sfunc = PMBUS_HAVE_STATUS_TEMP,
1472 .sbase = PB_STATUS_TEMP_BASE,
1473 .gbit = PB_STATUS_TEMPERATURE,
1474 .limit = temp_limit_attrs,
1475 .nlimit = ARRAY_SIZE(temp_limit_attrs),
1477 .reg = PMBUS_READ_TEMPERATURE_2,
1478 .class = PSC_TEMPERATURE,
1482 .func = PMBUS_HAVE_TEMP2,
1483 .sfunc = PMBUS_HAVE_STATUS_TEMP,
1484 .sbase = PB_STATUS_TEMP_BASE,
1485 .gbit = PB_STATUS_TEMPERATURE,
1486 .limit = temp_limit_attrs2,
1487 .nlimit = ARRAY_SIZE(temp_limit_attrs2),
1489 .reg = PMBUS_READ_TEMPERATURE_3,
1490 .class = PSC_TEMPERATURE,
1494 .func = PMBUS_HAVE_TEMP3,
1495 .sfunc = PMBUS_HAVE_STATUS_TEMP,
1496 .sbase = PB_STATUS_TEMP_BASE,
1497 .gbit = PB_STATUS_TEMPERATURE,
1498 .limit = temp_limit_attrs3,
1499 .nlimit = ARRAY_SIZE(temp_limit_attrs3),
1503 static const int pmbus_fan_registers[] = {
1504 PMBUS_READ_FAN_SPEED_1,
1505 PMBUS_READ_FAN_SPEED_2,
1506 PMBUS_READ_FAN_SPEED_3,
1507 PMBUS_READ_FAN_SPEED_4
1510 static const int pmbus_fan_config_registers[] = {
1511 PMBUS_FAN_CONFIG_12,
1512 PMBUS_FAN_CONFIG_12,
1513 PMBUS_FAN_CONFIG_34,
1517 static const int pmbus_fan_status_registers[] = {
1518 PMBUS_STATUS_FAN_12,
1519 PMBUS_STATUS_FAN_12,
1520 PMBUS_STATUS_FAN_34,
1524 static const u32 pmbus_fan_flags[] = {
1531 static const u32 pmbus_fan_status_flags[] = {
1532 PMBUS_HAVE_STATUS_FAN12,
1533 PMBUS_HAVE_STATUS_FAN12,
1534 PMBUS_HAVE_STATUS_FAN34,
1535 PMBUS_HAVE_STATUS_FAN34
1539 static int pmbus_add_fan_attributes(struct i2c_client *client,
1540 struct pmbus_data *data)
1542 const struct pmbus_driver_info *info = data->info;
1547 for (page = 0; page < info->pages; page++) {
1550 for (f = 0; f < ARRAY_SIZE(pmbus_fan_registers); f++) {
1553 if (!(info->func[page] & pmbus_fan_flags[f]))
1556 if (!pmbus_check_word_register(client, page,
1557 pmbus_fan_registers[f]))
1561 * Skip fan if not installed.
1562 * Each fan configuration register covers multiple fans,
1563 * so we have to do some magic.
1565 regval = _pmbus_read_byte_data(client, page,
1566 pmbus_fan_config_registers[f]);
1568 (!(regval & (PB_FAN_1_INSTALLED >> ((f & 1) * 4)))))
1571 if (pmbus_add_sensor(data, "fan", "input", index,
1572 page, pmbus_fan_registers[f],
1573 PSC_FAN, true, true) == NULL)
1577 * Each fan status register covers multiple fans,
1578 * so we have to do some magic.
1580 if ((info->func[page] & pmbus_fan_status_flags[f]) &&
1581 pmbus_check_byte_register(client,
1582 page, pmbus_fan_status_registers[f])) {
1585 if (f > 1) /* fan 3, 4 */
1586 base = PB_STATUS_FAN34_BASE + page;
1588 base = PB_STATUS_FAN_BASE + page;
1589 ret = pmbus_add_boolean(data, "fan",
1590 "alarm", index, NULL, NULL, base,
1591 PB_FAN_FAN1_WARNING >> (f & 1));
1594 ret = pmbus_add_boolean(data, "fan",
1595 "fault", index, NULL, NULL, base,
1596 PB_FAN_FAN1_FAULT >> (f & 1));
1606 static int pmbus_find_attributes(struct i2c_client *client,
1607 struct pmbus_data *data)
1611 /* Voltage sensors */
1612 ret = pmbus_add_sensor_attrs(client, data, "in", voltage_attributes,
1613 ARRAY_SIZE(voltage_attributes));
1617 /* Current sensors */
1618 ret = pmbus_add_sensor_attrs(client, data, "curr", current_attributes,
1619 ARRAY_SIZE(current_attributes));
1624 ret = pmbus_add_sensor_attrs(client, data, "power", power_attributes,
1625 ARRAY_SIZE(power_attributes));
1629 /* Temperature sensors */
1630 ret = pmbus_add_sensor_attrs(client, data, "temp", temp_attributes,
1631 ARRAY_SIZE(temp_attributes));
1636 ret = pmbus_add_fan_attributes(client, data);
1641 * Identify chip parameters.
1642 * This function is called for all chips.
1644 static int pmbus_identify_common(struct i2c_client *client,
1645 struct pmbus_data *data)
1649 if (pmbus_check_byte_register(client, 0, PMBUS_VOUT_MODE))
1650 vout_mode = _pmbus_read_byte_data(client, 0, PMBUS_VOUT_MODE);
1651 if (vout_mode >= 0 && vout_mode != 0xff) {
1653 * Not all chips support the VOUT_MODE command,
1654 * so a failure to read it is not an error.
1656 switch (vout_mode >> 5) {
1657 case 0: /* linear mode */
1658 if (data->info->format[PSC_VOLTAGE_OUT] != linear)
1661 data->exponent = ((s8)(vout_mode << 3)) >> 3;
1663 case 1: /* VID mode */
1664 if (data->info->format[PSC_VOLTAGE_OUT] != vid)
1667 case 2: /* direct mode */
1668 if (data->info->format[PSC_VOLTAGE_OUT] != direct)
1676 pmbus_clear_fault_page(client, 0);
1680 static int pmbus_init_common(struct i2c_client *client, struct pmbus_data *data,
1681 struct pmbus_driver_info *info)
1683 struct device *dev = &client->dev;
1687 * Some PMBus chips don't support PMBUS_STATUS_BYTE, so try
1688 * to use PMBUS_STATUS_WORD instead if that is the case.
1689 * Bail out if both registers are not supported.
1691 data->status_register = PMBUS_STATUS_BYTE;
1692 ret = i2c_smbus_read_byte_data(client, PMBUS_STATUS_BYTE);
1693 if (ret < 0 || ret == 0xff) {
1694 data->status_register = PMBUS_STATUS_WORD;
1695 ret = i2c_smbus_read_word_data(client, PMBUS_STATUS_WORD);
1696 if (ret < 0 || ret == 0xffff) {
1697 dev_err(dev, "PMBus status register not found\n");
1702 pmbus_clear_faults(client);
1704 if (info->identify) {
1705 ret = (*info->identify)(client, info);
1707 dev_err(dev, "Chip identification failed\n");
1712 if (info->pages <= 0 || info->pages > PMBUS_PAGES) {
1713 dev_err(dev, "Bad number of PMBus pages: %d\n", info->pages);
1717 ret = pmbus_identify_common(client, data);
1719 dev_err(dev, "Failed to identify chip capabilities\n");
1725 int pmbus_do_probe(struct i2c_client *client, const struct i2c_device_id *id,
1726 struct pmbus_driver_info *info)
1728 struct device *dev = &client->dev;
1729 const struct pmbus_platform_data *pdata = dev->platform_data;
1730 struct pmbus_data *data;
1736 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE
1737 | I2C_FUNC_SMBUS_BYTE_DATA
1738 | I2C_FUNC_SMBUS_WORD_DATA))
1741 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
1745 i2c_set_clientdata(client, data);
1746 mutex_init(&data->update_lock);
1750 data->flags = pdata->flags;
1753 ret = pmbus_init_common(client, data, info);
1757 ret = pmbus_find_attributes(client, data);
1762 * If there are no attributes, something is wrong.
1763 * Bail out instead of trying to register nothing.
1765 if (!data->num_attributes) {
1766 dev_err(dev, "No attributes found\n");
1771 /* Register sysfs hooks */
1772 ret = sysfs_create_group(&dev->kobj, &data->group);
1774 dev_err(dev, "Failed to create sysfs entries\n");
1777 data->hwmon_dev = hwmon_device_register(dev);
1778 if (IS_ERR(data->hwmon_dev)) {
1779 ret = PTR_ERR(data->hwmon_dev);
1780 dev_err(dev, "Failed to register hwmon device\n");
1781 goto out_hwmon_device_register;
1785 out_hwmon_device_register:
1786 sysfs_remove_group(&dev->kobj, &data->group);
1788 kfree(data->group.attrs);
1791 EXPORT_SYMBOL_GPL(pmbus_do_probe);
1793 int pmbus_do_remove(struct i2c_client *client)
1795 struct pmbus_data *data = i2c_get_clientdata(client);
1796 hwmon_device_unregister(data->hwmon_dev);
1797 sysfs_remove_group(&client->dev.kobj, &data->group);
1798 kfree(data->group.attrs);
1801 EXPORT_SYMBOL_GPL(pmbus_do_remove);
1803 MODULE_AUTHOR("Guenter Roeck");
1804 MODULE_DESCRIPTION("PMBus core driver");
1805 MODULE_LICENSE("GPL");