2 * Hardware monitoring driver for PMBus devices
4 * Copyright (c) 2010, 2011 Ericsson AB.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 #include <linux/kernel.h>
22 #include <linux/module.h>
23 #include <linux/init.h>
24 #include <linux/err.h>
25 #include <linux/slab.h>
26 #include <linux/i2c.h>
27 #include <linux/hwmon.h>
28 #include <linux/hwmon-sysfs.h>
29 #include <linux/delay.h>
30 #include <linux/i2c/pmbus.h>
34 * Constants needed to determine number of sensors, booleans, and labels.
36 #define PMBUS_MAX_INPUT_SENSORS 11 /* 6*volt, 3*curr, 2*power */
37 #define PMBUS_VOUT_SENSORS_PER_PAGE 5 /* input, min, max, lcrit,
39 #define PMBUS_IOUT_SENSORS_PER_PAGE 4 /* input, min, max, crit */
40 #define PMBUS_POUT_SENSORS_PER_PAGE 4 /* input, cap, max, crit */
41 #define PMBUS_MAX_SENSORS_PER_FAN 1 /* input */
42 #define PMBUS_MAX_SENSORS_PER_TEMP 5 /* input, min, max, lcrit,
45 #define PMBUS_MAX_INPUT_BOOLEANS 7 /* v: min_alarm, max_alarm,
46 lcrit_alarm, crit_alarm;
49 #define PMBUS_VOUT_BOOLEANS_PER_PAGE 4 /* min_alarm, max_alarm,
50 lcrit_alarm, crit_alarm */
51 #define PMBUS_IOUT_BOOLEANS_PER_PAGE 3 /* alarm, lcrit_alarm,
53 #define PMBUS_POUT_BOOLEANS_PER_PAGE 2 /* alarm, crit_alarm */
54 #define PMBUS_MAX_BOOLEANS_PER_FAN 2 /* alarm, fault */
55 #define PMBUS_MAX_BOOLEANS_PER_TEMP 4 /* min_alarm, max_alarm,
56 lcrit_alarm, crit_alarm */
58 #define PMBUS_MAX_INPUT_LABELS 4 /* vin, vcap, iin, pin */
61 * status, status_vout, status_iout, status_fans, status_fan34, and status_temp
62 * are paged. status_input is unpaged.
64 #define PB_NUM_STATUS_REG (PMBUS_PAGES * 6 + 1)
67 * Index into status register array, per status register group
69 #define PB_STATUS_BASE 0
70 #define PB_STATUS_VOUT_BASE (PB_STATUS_BASE + PMBUS_PAGES)
71 #define PB_STATUS_IOUT_BASE (PB_STATUS_VOUT_BASE + PMBUS_PAGES)
72 #define PB_STATUS_FAN_BASE (PB_STATUS_IOUT_BASE + PMBUS_PAGES)
73 #define PB_STATUS_FAN34_BASE (PB_STATUS_FAN_BASE + PMBUS_PAGES)
74 #define PB_STATUS_INPUT_BASE (PB_STATUS_FAN34_BASE + PMBUS_PAGES)
75 #define PB_STATUS_TEMP_BASE (PB_STATUS_INPUT_BASE + 1)
78 char name[I2C_NAME_SIZE]; /* sysfs sensor name */
79 struct sensor_device_attribute attribute;
80 u8 page; /* page number */
81 u8 reg; /* register */
82 enum pmbus_sensor_classes class; /* sensor class */
83 bool update; /* runtime sensor update needed */
84 int data; /* Sensor data.
85 Negative if there was a read error */
88 struct pmbus_boolean {
89 char name[I2C_NAME_SIZE]; /* sysfs boolean name */
90 struct sensor_device_attribute attribute;
94 char name[I2C_NAME_SIZE]; /* sysfs label name */
95 struct sensor_device_attribute attribute;
96 char label[I2C_NAME_SIZE]; /* label */
100 struct device *hwmon_dev;
102 u32 flags; /* from platform data */
104 int exponent; /* linear mode: exponent for output voltages */
106 const struct pmbus_driver_info *info;
110 struct attribute **attributes;
111 struct attribute_group group;
114 * Sensors cover both sensor and limit registers.
118 struct pmbus_sensor *sensors;
120 * Booleans are used for alarms.
121 * Values are determined from status registers.
125 struct pmbus_boolean *booleans;
127 * Labels are used to map generic names (e.g., "in1")
128 * to PMBus specific names (e.g., "vin" or "vout1").
132 struct pmbus_label *labels;
134 struct mutex update_lock;
136 unsigned long last_updated; /* in jiffies */
139 * A single status register covers multiple attributes,
140 * so we keep them all together.
143 u8 status[PB_NUM_STATUS_REG];
148 int pmbus_set_page(struct i2c_client *client, u8 page)
150 struct pmbus_data *data = i2c_get_clientdata(client);
154 if (page != data->currpage) {
155 rv = i2c_smbus_write_byte_data(client, PMBUS_PAGE, page);
156 newpage = i2c_smbus_read_byte_data(client, PMBUS_PAGE);
160 data->currpage = page;
164 EXPORT_SYMBOL_GPL(pmbus_set_page);
166 static int pmbus_write_byte(struct i2c_client *client, u8 page, u8 value)
170 rv = pmbus_set_page(client, page);
174 return i2c_smbus_write_byte(client, value);
177 static int pmbus_write_word_data(struct i2c_client *client, u8 page, u8 reg,
182 rv = pmbus_set_page(client, page);
186 return i2c_smbus_write_word_data(client, reg, word);
189 int pmbus_read_word_data(struct i2c_client *client, u8 page, u8 reg)
193 rv = pmbus_set_page(client, page);
197 return i2c_smbus_read_word_data(client, reg);
199 EXPORT_SYMBOL_GPL(pmbus_read_word_data);
201 static int pmbus_read_byte_data(struct i2c_client *client, u8 page, u8 reg)
205 rv = pmbus_set_page(client, page);
209 return i2c_smbus_read_byte_data(client, reg);
212 static void pmbus_clear_fault_page(struct i2c_client *client, int page)
214 pmbus_write_byte(client, page, PMBUS_CLEAR_FAULTS);
217 void pmbus_clear_faults(struct i2c_client *client)
219 struct pmbus_data *data = i2c_get_clientdata(client);
222 for (i = 0; i < data->info->pages; i++)
223 pmbus_clear_fault_page(client, i);
225 EXPORT_SYMBOL_GPL(pmbus_clear_faults);
227 static int pmbus_check_status_cml(struct i2c_client *client, int page)
231 status = pmbus_read_byte_data(client, page, PMBUS_STATUS_BYTE);
232 if (status < 0 || (status & PB_STATUS_CML)) {
233 status2 = pmbus_read_byte_data(client, page, PMBUS_STATUS_CML);
234 if (status2 < 0 || (status2 & PB_CML_FAULT_INVALID_COMMAND))
240 bool pmbus_check_byte_register(struct i2c_client *client, int page, int reg)
243 struct pmbus_data *data = i2c_get_clientdata(client);
245 rv = pmbus_read_byte_data(client, page, reg);
246 if (rv >= 0 && !(data->flags & PMBUS_SKIP_STATUS_CHECK))
247 rv = pmbus_check_status_cml(client, page);
248 pmbus_clear_fault_page(client, page);
251 EXPORT_SYMBOL_GPL(pmbus_check_byte_register);
253 bool pmbus_check_word_register(struct i2c_client *client, int page, int reg)
256 struct pmbus_data *data = i2c_get_clientdata(client);
258 rv = pmbus_read_word_data(client, page, reg);
259 if (rv >= 0 && !(data->flags & PMBUS_SKIP_STATUS_CHECK))
260 rv = pmbus_check_status_cml(client, page);
261 pmbus_clear_fault_page(client, page);
264 EXPORT_SYMBOL_GPL(pmbus_check_word_register);
266 const struct pmbus_driver_info *pmbus_get_driver_info(struct i2c_client *client)
268 struct pmbus_data *data = i2c_get_clientdata(client);
272 EXPORT_SYMBOL_GPL(pmbus_get_driver_info);
274 static int pmbus_get_status(struct i2c_client *client, int page, int reg)
276 struct pmbus_data *data = i2c_get_clientdata(client);
277 const struct pmbus_driver_info *info = data->info;
280 if (info->get_status) {
281 status = info->get_status(client, page, reg);
282 if (status != -ENODATA)
285 return pmbus_read_byte_data(client, page, reg);
288 static struct pmbus_data *pmbus_update_device(struct device *dev)
290 struct i2c_client *client = to_i2c_client(dev);
291 struct pmbus_data *data = i2c_get_clientdata(client);
292 const struct pmbus_driver_info *info = data->info;
294 mutex_lock(&data->update_lock);
295 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
298 for (i = 0; i < info->pages; i++)
299 data->status[PB_STATUS_BASE + i]
300 = pmbus_read_byte_data(client, i,
302 for (i = 0; i < info->pages; i++) {
303 if (!(info->func[i] & PMBUS_HAVE_STATUS_VOUT))
305 data->status[PB_STATUS_VOUT_BASE + i]
306 = pmbus_get_status(client, i, PMBUS_STATUS_VOUT);
308 for (i = 0; i < info->pages; i++) {
309 if (!(info->func[i] & PMBUS_HAVE_STATUS_IOUT))
311 data->status[PB_STATUS_IOUT_BASE + i]
312 = pmbus_get_status(client, i, PMBUS_STATUS_IOUT);
314 for (i = 0; i < info->pages; i++) {
315 if (!(info->func[i] & PMBUS_HAVE_STATUS_TEMP))
317 data->status[PB_STATUS_TEMP_BASE + i]
318 = pmbus_get_status(client, i,
319 PMBUS_STATUS_TEMPERATURE);
321 for (i = 0; i < info->pages; i++) {
322 if (!(info->func[i] & PMBUS_HAVE_STATUS_FAN12))
324 data->status[PB_STATUS_FAN_BASE + i]
325 = pmbus_get_status(client, i, PMBUS_STATUS_FAN_12);
328 for (i = 0; i < info->pages; i++) {
329 if (!(info->func[i] & PMBUS_HAVE_STATUS_FAN34))
331 data->status[PB_STATUS_FAN34_BASE + i]
332 = pmbus_get_status(client, i, PMBUS_STATUS_FAN_34);
335 if (info->func[0] & PMBUS_HAVE_STATUS_INPUT)
336 data->status[PB_STATUS_INPUT_BASE]
337 = pmbus_get_status(client, 0, PMBUS_STATUS_INPUT);
339 for (i = 0; i < data->num_sensors; i++) {
340 struct pmbus_sensor *sensor = &data->sensors[i];
342 if (!data->valid || sensor->update)
344 = pmbus_read_word_data(client, sensor->page,
347 pmbus_clear_faults(client);
348 data->last_updated = jiffies;
351 mutex_unlock(&data->update_lock);
356 * Convert linear sensor values to milli- or micro-units
357 * depending on sensor type.
359 static int pmbus_reg2data_linear(struct pmbus_data *data,
360 struct pmbus_sensor *sensor)
366 if (sensor->class == PSC_VOLTAGE_OUT) { /* LINEAR16 */
367 exponent = data->exponent;
368 mantissa = (u16) sensor->data;
369 } else { /* LINEAR11 */
370 exponent = (sensor->data >> 11) & 0x001f;
371 mantissa = sensor->data & 0x07ff;
374 exponent |= 0xffe0; /* sign extend exponent */
375 if (mantissa > 0x03ff)
376 mantissa |= 0xfffff800; /* sign extend mantissa */
381 /* scale result to milli-units for all sensors except fans */
382 if (sensor->class != PSC_FAN)
385 /* scale result to micro-units for power sensors */
386 if (sensor->class == PSC_POWER)
398 * Convert direct sensor values to milli- or micro-units
399 * depending on sensor type.
401 static int pmbus_reg2data_direct(struct pmbus_data *data,
402 struct pmbus_sensor *sensor)
404 long val = (s16) sensor->data;
407 m = data->info->m[sensor->class];
408 b = data->info->b[sensor->class];
409 R = data->info->R[sensor->class];
414 /* X = 1/m * (Y * 10^-R - b) */
416 /* scale result to milli-units for everything but fans */
417 if (sensor->class != PSC_FAN) {
422 /* scale result to micro-units for power sensors */
423 if (sensor->class == PSC_POWER) {
433 val = DIV_ROUND_CLOSEST(val, 10);
437 return (int)((val - b) / m);
440 static int pmbus_reg2data(struct pmbus_data *data, struct pmbus_sensor *sensor)
444 if (data->info->direct[sensor->class])
445 val = pmbus_reg2data_direct(data, sensor);
447 val = pmbus_reg2data_linear(data, sensor);
452 #define MAX_MANTISSA (1023 * 1000)
453 #define MIN_MANTISSA (511 * 1000)
455 static u16 pmbus_data2reg_linear(struct pmbus_data *data,
456 enum pmbus_sensor_classes class, long val)
458 s16 exponent = 0, mantissa;
459 bool negative = false;
465 if (class == PSC_VOLTAGE_OUT) {
466 /* LINEAR16 does not support negative voltages */
471 * For a static exponents, we don't have a choice
472 * but to adjust the value to it.
474 if (data->exponent < 0)
475 val <<= -data->exponent;
477 val >>= data->exponent;
478 val = DIV_ROUND_CLOSEST(val, 1000);
487 /* Power is in uW. Convert to mW before converting. */
488 if (class == PSC_POWER)
489 val = DIV_ROUND_CLOSEST(val, 1000L);
492 * For simplicity, convert fan data to milli-units
493 * before calculating the exponent.
495 if (class == PSC_FAN)
498 /* Reduce large mantissa until it fits into 10 bit */
499 while (val >= MAX_MANTISSA && exponent < 15) {
503 /* Increase small mantissa to improve precision */
504 while (val < MIN_MANTISSA && exponent > -15) {
509 /* Convert mantissa from milli-units to units */
510 mantissa = DIV_ROUND_CLOSEST(val, 1000);
512 /* Ensure that resulting number is within range */
513 if (mantissa > 0x3ff)
518 mantissa = -mantissa;
520 /* Convert to 5 bit exponent, 11 bit mantissa */
521 return (mantissa & 0x7ff) | ((exponent << 11) & 0xf800);
524 static u16 pmbus_data2reg_direct(struct pmbus_data *data,
525 enum pmbus_sensor_classes class, long val)
529 m = data->info->m[class];
530 b = data->info->b[class];
531 R = data->info->R[class];
533 /* Power is in uW. Adjust R and b. */
534 if (class == PSC_POWER) {
539 /* Calculate Y = (m * X + b) * 10^R */
540 if (class != PSC_FAN) {
541 R -= 3; /* Adjust R and b for data in milli-units */
551 val = DIV_ROUND_CLOSEST(val, 10);
558 static u16 pmbus_data2reg(struct pmbus_data *data,
559 enum pmbus_sensor_classes class, long val)
563 if (data->info->direct[class])
564 regval = pmbus_data2reg_direct(data, class, val);
566 regval = pmbus_data2reg_linear(data, class, val);
572 * Return boolean calculated from converted data.
573 * <index> defines a status register index and mask, and optionally
574 * two sensor indexes.
575 * The upper half-word references the two sensors,
576 * two sensor indices.
577 * The upper half-word references the two optional sensors,
578 * the lower half word references status register and mask.
579 * The function returns true if (status[reg] & mask) is true and,
580 * if specified, if v1 >= v2.
581 * To determine if an object exceeds upper limits, specify <v, limit>.
582 * To determine if an object exceeds lower limits, specify <limit, v>.
584 * For booleans created with pmbus_add_boolean_reg(), only the lower 16 bits of
585 * index are set. s1 and s2 (the sensor index values) are zero in this case.
586 * The function returns true if (status[reg] & mask) is true.
588 * If the boolean was created with pmbus_add_boolean_cmp(), a comparison against
589 * a specified limit has to be performed to determine the boolean result.
590 * In this case, the function returns true if v1 >= v2 (where v1 and v2 are
591 * sensor values referenced by sensor indices s1 and s2).
593 * To determine if an object exceeds upper limits, specify <s1,s2> = <v,limit>.
594 * To determine if an object exceeds lower limits, specify <s1,s2> = <limit,v>.
596 * If a negative value is stored in any of the referenced registers, this value
597 * reflects an error code which will be returned.
599 static int pmbus_get_boolean(struct pmbus_data *data, int index, int *val)
601 u8 s1 = (index >> 24) & 0xff;
602 u8 s2 = (index >> 16) & 0xff;
603 u8 reg = (index >> 8) & 0xff;
604 u8 mask = index & 0xff;
608 status = data->status[reg];
612 regval = status & mask;
617 struct pmbus_sensor *sensor1, *sensor2;
619 sensor1 = &data->sensors[s1];
620 if (sensor1->data < 0)
621 return sensor1->data;
622 sensor2 = &data->sensors[s2];
623 if (sensor2->data < 0)
624 return sensor2->data;
626 v1 = pmbus_reg2data(data, sensor1);
627 v2 = pmbus_reg2data(data, sensor2);
628 *val = !!(regval && v1 >= v2);
633 static ssize_t pmbus_show_boolean(struct device *dev,
634 struct device_attribute *da, char *buf)
636 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
637 struct pmbus_data *data = pmbus_update_device(dev);
641 err = pmbus_get_boolean(data, attr->index, &val);
644 return snprintf(buf, PAGE_SIZE, "%d\n", val);
647 static ssize_t pmbus_show_sensor(struct device *dev,
648 struct device_attribute *da, char *buf)
650 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
651 struct pmbus_data *data = pmbus_update_device(dev);
652 struct pmbus_sensor *sensor;
654 sensor = &data->sensors[attr->index];
655 if (sensor->data < 0)
658 return snprintf(buf, PAGE_SIZE, "%d\n", pmbus_reg2data(data, sensor));
661 static ssize_t pmbus_set_sensor(struct device *dev,
662 struct device_attribute *devattr,
663 const char *buf, size_t count)
665 struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
666 struct i2c_client *client = to_i2c_client(dev);
667 struct pmbus_data *data = i2c_get_clientdata(client);
668 struct pmbus_sensor *sensor = &data->sensors[attr->index];
674 if (strict_strtol(buf, 10, &val) < 0)
677 mutex_lock(&data->update_lock);
678 regval = pmbus_data2reg(data, sensor->class, val);
679 ret = pmbus_write_word_data(client, sensor->page, sensor->reg, regval);
683 data->sensors[attr->index].data = regval;
684 mutex_unlock(&data->update_lock);
688 static ssize_t pmbus_show_label(struct device *dev,
689 struct device_attribute *da, char *buf)
691 struct i2c_client *client = to_i2c_client(dev);
692 struct pmbus_data *data = i2c_get_clientdata(client);
693 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
695 return snprintf(buf, PAGE_SIZE, "%s\n",
696 data->labels[attr->index].label);
699 #define PMBUS_ADD_ATTR(data, _name, _idx, _mode, _type, _show, _set) \
701 struct sensor_device_attribute *a \
702 = &data->_type##s[data->num_##_type##s].attribute; \
703 BUG_ON(data->num_attributes >= data->max_attributes); \
704 a->dev_attr.attr.name = _name; \
705 a->dev_attr.attr.mode = _mode; \
706 a->dev_attr.show = _show; \
707 a->dev_attr.store = _set; \
709 data->attributes[data->num_attributes] = &a->dev_attr.attr; \
710 data->num_attributes++; \
713 #define PMBUS_ADD_GET_ATTR(data, _name, _type, _idx) \
714 PMBUS_ADD_ATTR(data, _name, _idx, S_IRUGO, _type, \
715 pmbus_show_##_type, NULL)
717 #define PMBUS_ADD_SET_ATTR(data, _name, _type, _idx) \
718 PMBUS_ADD_ATTR(data, _name, _idx, S_IWUSR | S_IRUGO, _type, \
719 pmbus_show_##_type, pmbus_set_##_type)
721 static void pmbus_add_boolean(struct pmbus_data *data,
722 const char *name, const char *type, int seq,
725 struct pmbus_boolean *boolean;
727 BUG_ON(data->num_booleans >= data->max_booleans);
729 boolean = &data->booleans[data->num_booleans];
731 snprintf(boolean->name, sizeof(boolean->name), "%s%d_%s",
733 PMBUS_ADD_GET_ATTR(data, boolean->name, boolean, idx);
734 data->num_booleans++;
737 static void pmbus_add_boolean_reg(struct pmbus_data *data,
738 const char *name, const char *type,
739 int seq, int reg, int bit)
741 pmbus_add_boolean(data, name, type, seq, (reg << 8) | bit);
744 static void pmbus_add_boolean_cmp(struct pmbus_data *data,
745 const char *name, const char *type,
746 int seq, int i1, int i2, int reg, int mask)
748 pmbus_add_boolean(data, name, type, seq,
749 (i1 << 24) | (i2 << 16) | (reg << 8) | mask);
752 static void pmbus_add_sensor(struct pmbus_data *data,
753 const char *name, const char *type, int seq,
754 int page, int reg, enum pmbus_sensor_classes class,
757 struct pmbus_sensor *sensor;
759 BUG_ON(data->num_sensors >= data->max_sensors);
761 sensor = &data->sensors[data->num_sensors];
762 snprintf(sensor->name, sizeof(sensor->name), "%s%d_%s",
766 sensor->class = class;
767 sensor->update = update;
769 PMBUS_ADD_GET_ATTR(data, sensor->name, sensor,
772 PMBUS_ADD_SET_ATTR(data, sensor->name, sensor,
777 static void pmbus_add_label(struct pmbus_data *data,
778 const char *name, int seq,
779 const char *lstring, int index)
781 struct pmbus_label *label;
783 BUG_ON(data->num_labels >= data->max_labels);
785 label = &data->labels[data->num_labels];
786 snprintf(label->name, sizeof(label->name), "%s%d_label", name, seq);
788 strncpy(label->label, lstring, sizeof(label->label) - 1);
790 snprintf(label->label, sizeof(label->label), "%s%d", lstring,
793 PMBUS_ADD_GET_ATTR(data, label->name, label, data->num_labels);
797 static const int pmbus_temp_registers[] = {
798 PMBUS_READ_TEMPERATURE_1,
799 PMBUS_READ_TEMPERATURE_2,
800 PMBUS_READ_TEMPERATURE_3
803 static const int pmbus_temp_flags[] = {
809 static const int pmbus_fan_registers[] = {
810 PMBUS_READ_FAN_SPEED_1,
811 PMBUS_READ_FAN_SPEED_2,
812 PMBUS_READ_FAN_SPEED_3,
813 PMBUS_READ_FAN_SPEED_4
816 static const int pmbus_fan_config_registers[] = {
823 static const int pmbus_fan_status_registers[] = {
830 static const u32 pmbus_fan_flags[] = {
837 static const u32 pmbus_fan_status_flags[] = {
838 PMBUS_HAVE_STATUS_FAN12,
839 PMBUS_HAVE_STATUS_FAN12,
840 PMBUS_HAVE_STATUS_FAN34,
841 PMBUS_HAVE_STATUS_FAN34
845 * Determine maximum number of sensors, booleans, and labels.
846 * To keep things simple, only make a rough high estimate.
848 static void pmbus_find_max_attr(struct i2c_client *client,
849 struct pmbus_data *data)
851 const struct pmbus_driver_info *info = data->info;
852 int page, max_sensors, max_booleans, max_labels;
854 max_sensors = PMBUS_MAX_INPUT_SENSORS;
855 max_booleans = PMBUS_MAX_INPUT_BOOLEANS;
856 max_labels = PMBUS_MAX_INPUT_LABELS;
858 for (page = 0; page < info->pages; page++) {
859 if (info->func[page] & PMBUS_HAVE_VOUT) {
860 max_sensors += PMBUS_VOUT_SENSORS_PER_PAGE;
861 max_booleans += PMBUS_VOUT_BOOLEANS_PER_PAGE;
864 if (info->func[page] & PMBUS_HAVE_IOUT) {
865 max_sensors += PMBUS_IOUT_SENSORS_PER_PAGE;
866 max_booleans += PMBUS_IOUT_BOOLEANS_PER_PAGE;
869 if (info->func[page] & PMBUS_HAVE_POUT) {
870 max_sensors += PMBUS_POUT_SENSORS_PER_PAGE;
871 max_booleans += PMBUS_POUT_BOOLEANS_PER_PAGE;
874 if (info->func[page] & PMBUS_HAVE_FAN12) {
875 max_sensors += 2 * PMBUS_MAX_SENSORS_PER_FAN;
876 max_booleans += 2 * PMBUS_MAX_BOOLEANS_PER_FAN;
878 if (info->func[page] & PMBUS_HAVE_FAN34) {
879 max_sensors += 2 * PMBUS_MAX_SENSORS_PER_FAN;
880 max_booleans += 2 * PMBUS_MAX_BOOLEANS_PER_FAN;
882 if (info->func[page] & PMBUS_HAVE_TEMP) {
883 max_sensors += PMBUS_MAX_SENSORS_PER_TEMP;
884 max_booleans += PMBUS_MAX_BOOLEANS_PER_TEMP;
886 if (info->func[page] & PMBUS_HAVE_TEMP2) {
887 max_sensors += PMBUS_MAX_SENSORS_PER_TEMP;
888 max_booleans += PMBUS_MAX_BOOLEANS_PER_TEMP;
890 if (info->func[page] & PMBUS_HAVE_TEMP3) {
891 max_sensors += PMBUS_MAX_SENSORS_PER_TEMP;
892 max_booleans += PMBUS_MAX_BOOLEANS_PER_TEMP;
895 data->max_sensors = max_sensors;
896 data->max_booleans = max_booleans;
897 data->max_labels = max_labels;
898 data->max_attributes = max_sensors + max_booleans + max_labels;
902 * Search for attributes. Allocate sensors, booleans, and labels as needed.
904 static void pmbus_find_attributes(struct i2c_client *client,
905 struct pmbus_data *data)
907 const struct pmbus_driver_info *info = data->info;
908 int page, i0, i1, in_index;
911 * Input voltage sensors
914 if (info->func[0] & PMBUS_HAVE_VIN) {
915 bool have_alarm = false;
917 i0 = data->num_sensors;
918 pmbus_add_label(data, "in", in_index, "vin", 0);
919 pmbus_add_sensor(data, "in", "input", in_index,
920 0, PMBUS_READ_VIN, PSC_VOLTAGE_IN, true);
921 if (pmbus_check_word_register(client, 0,
922 PMBUS_VIN_UV_WARN_LIMIT)) {
923 i1 = data->num_sensors;
924 pmbus_add_sensor(data, "in", "min", in_index,
925 0, PMBUS_VIN_UV_WARN_LIMIT,
926 PSC_VOLTAGE_IN, false);
927 if (info->func[0] & PMBUS_HAVE_STATUS_INPUT) {
928 pmbus_add_boolean_reg(data, "in", "min_alarm",
930 PB_STATUS_INPUT_BASE,
931 PB_VOLTAGE_UV_WARNING);
935 if (pmbus_check_word_register(client, 0,
936 PMBUS_VIN_UV_FAULT_LIMIT)) {
937 i1 = data->num_sensors;
938 pmbus_add_sensor(data, "in", "lcrit", in_index,
939 0, PMBUS_VIN_UV_FAULT_LIMIT,
940 PSC_VOLTAGE_IN, false);
941 if (info->func[0] & PMBUS_HAVE_STATUS_INPUT) {
942 pmbus_add_boolean_reg(data, "in", "lcrit_alarm",
944 PB_STATUS_INPUT_BASE,
945 PB_VOLTAGE_UV_FAULT);
949 if (pmbus_check_word_register(client, 0,
950 PMBUS_VIN_OV_WARN_LIMIT)) {
951 i1 = data->num_sensors;
952 pmbus_add_sensor(data, "in", "max", in_index,
953 0, PMBUS_VIN_OV_WARN_LIMIT,
954 PSC_VOLTAGE_IN, false);
955 if (info->func[0] & PMBUS_HAVE_STATUS_INPUT) {
956 pmbus_add_boolean_reg(data, "in", "max_alarm",
958 PB_STATUS_INPUT_BASE,
959 PB_VOLTAGE_OV_WARNING);
963 if (pmbus_check_word_register(client, 0,
964 PMBUS_VIN_OV_FAULT_LIMIT)) {
965 i1 = data->num_sensors;
966 pmbus_add_sensor(data, "in", "crit", in_index,
967 0, PMBUS_VIN_OV_FAULT_LIMIT,
968 PSC_VOLTAGE_IN, false);
969 if (info->func[0] & PMBUS_HAVE_STATUS_INPUT) {
970 pmbus_add_boolean_reg(data, "in", "crit_alarm",
972 PB_STATUS_INPUT_BASE,
973 PB_VOLTAGE_OV_FAULT);
978 * Add generic alarm attribute only if there are no individual
982 pmbus_add_boolean_reg(data, "in", "alarm",
988 if (info->func[0] & PMBUS_HAVE_VCAP) {
989 pmbus_add_label(data, "in", in_index, "vcap", 0);
990 pmbus_add_sensor(data, "in", "input", in_index, 0,
991 PMBUS_READ_VCAP, PSC_VOLTAGE_IN, true);
996 * Output voltage sensors
998 for (page = 0; page < info->pages; page++) {
999 bool have_alarm = false;
1001 if (!(info->func[page] & PMBUS_HAVE_VOUT))
1004 i0 = data->num_sensors;
1005 pmbus_add_label(data, "in", in_index, "vout", page + 1);
1006 pmbus_add_sensor(data, "in", "input", in_index, page,
1007 PMBUS_READ_VOUT, PSC_VOLTAGE_OUT, true);
1008 if (pmbus_check_word_register(client, page,
1009 PMBUS_VOUT_UV_WARN_LIMIT)) {
1010 i1 = data->num_sensors;
1011 pmbus_add_sensor(data, "in", "min", in_index, page,
1012 PMBUS_VOUT_UV_WARN_LIMIT,
1013 PSC_VOLTAGE_OUT, false);
1014 if (info->func[page] & PMBUS_HAVE_STATUS_VOUT) {
1015 pmbus_add_boolean_reg(data, "in", "min_alarm",
1017 PB_STATUS_VOUT_BASE +
1019 PB_VOLTAGE_UV_WARNING);
1023 if (pmbus_check_word_register(client, page,
1024 PMBUS_VOUT_UV_FAULT_LIMIT)) {
1025 i1 = data->num_sensors;
1026 pmbus_add_sensor(data, "in", "lcrit", in_index, page,
1027 PMBUS_VOUT_UV_FAULT_LIMIT,
1028 PSC_VOLTAGE_OUT, false);
1029 if (info->func[page] & PMBUS_HAVE_STATUS_VOUT) {
1030 pmbus_add_boolean_reg(data, "in", "lcrit_alarm",
1032 PB_STATUS_VOUT_BASE +
1034 PB_VOLTAGE_UV_FAULT);
1038 if (pmbus_check_word_register(client, page,
1039 PMBUS_VOUT_OV_WARN_LIMIT)) {
1040 i1 = data->num_sensors;
1041 pmbus_add_sensor(data, "in", "max", in_index, page,
1042 PMBUS_VOUT_OV_WARN_LIMIT,
1043 PSC_VOLTAGE_OUT, false);
1044 if (info->func[page] & PMBUS_HAVE_STATUS_VOUT) {
1045 pmbus_add_boolean_reg(data, "in", "max_alarm",
1047 PB_STATUS_VOUT_BASE +
1049 PB_VOLTAGE_OV_WARNING);
1053 if (pmbus_check_word_register(client, page,
1054 PMBUS_VOUT_OV_FAULT_LIMIT)) {
1055 i1 = data->num_sensors;
1056 pmbus_add_sensor(data, "in", "crit", in_index, page,
1057 PMBUS_VOUT_OV_FAULT_LIMIT,
1058 PSC_VOLTAGE_OUT, false);
1059 if (info->func[page] & PMBUS_HAVE_STATUS_VOUT) {
1060 pmbus_add_boolean_reg(data, "in", "crit_alarm",
1062 PB_STATUS_VOUT_BASE +
1064 PB_VOLTAGE_OV_FAULT);
1069 * Add generic alarm attribute only if there are no individual
1073 pmbus_add_boolean_reg(data, "in", "alarm",
1075 PB_STATUS_BASE + page,
1085 * Input current sensors
1088 if (info->func[0] & PMBUS_HAVE_IIN) {
1089 i0 = data->num_sensors;
1090 pmbus_add_label(data, "curr", in_index, "iin", 0);
1091 pmbus_add_sensor(data, "curr", "input", in_index,
1092 0, PMBUS_READ_IIN, PSC_CURRENT_IN, true);
1093 if (pmbus_check_word_register(client, 0,
1094 PMBUS_IIN_OC_WARN_LIMIT)) {
1095 i1 = data->num_sensors;
1096 pmbus_add_sensor(data, "curr", "max", in_index,
1097 0, PMBUS_IIN_OC_WARN_LIMIT,
1098 PSC_CURRENT_IN, false);
1099 if (info->func[0] & PMBUS_HAVE_STATUS_INPUT) {
1100 pmbus_add_boolean_reg(data, "curr", "max_alarm",
1102 PB_STATUS_INPUT_BASE,
1106 if (pmbus_check_word_register(client, 0,
1107 PMBUS_IIN_OC_FAULT_LIMIT)) {
1108 i1 = data->num_sensors;
1109 pmbus_add_sensor(data, "curr", "crit", in_index,
1110 0, PMBUS_IIN_OC_FAULT_LIMIT,
1111 PSC_CURRENT_IN, false);
1112 if (info->func[0] & PMBUS_HAVE_STATUS_INPUT)
1113 pmbus_add_boolean_reg(data, "curr",
1116 PB_STATUS_INPUT_BASE,
1123 * Output current sensors
1125 for (page = 0; page < info->pages; page++) {
1126 bool have_alarm = false;
1128 if (!(info->func[page] & PMBUS_HAVE_IOUT))
1131 i0 = data->num_sensors;
1132 pmbus_add_label(data, "curr", in_index, "iout", page + 1);
1133 pmbus_add_sensor(data, "curr", "input", in_index, page,
1134 PMBUS_READ_IOUT, PSC_CURRENT_OUT, true);
1135 if (pmbus_check_word_register(client, page,
1136 PMBUS_IOUT_OC_WARN_LIMIT)) {
1137 i1 = data->num_sensors;
1138 pmbus_add_sensor(data, "curr", "max", in_index, page,
1139 PMBUS_IOUT_OC_WARN_LIMIT,
1140 PSC_CURRENT_OUT, false);
1141 if (info->func[page] & PMBUS_HAVE_STATUS_IOUT) {
1142 pmbus_add_boolean_reg(data, "curr", "max_alarm",
1144 PB_STATUS_IOUT_BASE +
1145 page, PB_IOUT_OC_WARNING);
1149 if (pmbus_check_word_register(client, page,
1150 PMBUS_IOUT_UC_FAULT_LIMIT)) {
1151 i1 = data->num_sensors;
1152 pmbus_add_sensor(data, "curr", "lcrit", in_index, page,
1153 PMBUS_IOUT_UC_FAULT_LIMIT,
1154 PSC_CURRENT_OUT, false);
1155 if (info->func[page] & PMBUS_HAVE_STATUS_IOUT) {
1156 pmbus_add_boolean_reg(data, "curr",
1159 PB_STATUS_IOUT_BASE +
1160 page, PB_IOUT_UC_FAULT);
1164 if (pmbus_check_word_register(client, page,
1165 PMBUS_IOUT_OC_FAULT_LIMIT)) {
1166 i1 = data->num_sensors;
1167 pmbus_add_sensor(data, "curr", "crit", in_index, page,
1168 PMBUS_IOUT_OC_FAULT_LIMIT,
1169 PSC_CURRENT_OUT, false);
1170 if (info->func[page] & PMBUS_HAVE_STATUS_IOUT) {
1171 pmbus_add_boolean_reg(data, "curr",
1174 PB_STATUS_IOUT_BASE +
1175 page, PB_IOUT_OC_FAULT);
1180 * Add generic alarm attribute only if there are no individual
1184 pmbus_add_boolean_reg(data, "curr", "alarm",
1186 PB_STATUS_BASE + page,
1195 * Input Power sensors
1198 if (info->func[0] & PMBUS_HAVE_PIN) {
1199 i0 = data->num_sensors;
1200 pmbus_add_label(data, "power", in_index, "pin", 0);
1201 pmbus_add_sensor(data, "power", "input", in_index,
1202 0, PMBUS_READ_PIN, PSC_POWER, true);
1203 if (pmbus_check_word_register(client, 0,
1204 PMBUS_PIN_OP_WARN_LIMIT)) {
1205 i1 = data->num_sensors;
1206 pmbus_add_sensor(data, "power", "max", in_index,
1207 0, PMBUS_PIN_OP_WARN_LIMIT, PSC_POWER,
1209 if (info->func[0] & PMBUS_HAVE_STATUS_INPUT)
1210 pmbus_add_boolean_reg(data, "power",
1213 PB_STATUS_INPUT_BASE,
1220 * Output Power sensors
1222 for (page = 0; page < info->pages; page++) {
1223 bool need_alarm = false;
1225 if (!(info->func[page] & PMBUS_HAVE_POUT))
1228 i0 = data->num_sensors;
1229 pmbus_add_label(data, "power", in_index, "pout", page + 1);
1230 pmbus_add_sensor(data, "power", "input", in_index, page,
1231 PMBUS_READ_POUT, PSC_POWER, true);
1233 * Per hwmon sysfs API, power_cap is to be used to limit output
1235 * We have two registers related to maximum output power,
1236 * PMBUS_POUT_MAX and PMBUS_POUT_OP_WARN_LIMIT.
1237 * PMBUS_POUT_MAX matches the powerX_cap attribute definition.
1238 * There is no attribute in the API to match
1239 * PMBUS_POUT_OP_WARN_LIMIT. We use powerX_max for now.
1241 if (pmbus_check_word_register(client, page, PMBUS_POUT_MAX)) {
1242 i1 = data->num_sensors;
1243 pmbus_add_sensor(data, "power", "cap", in_index, page,
1244 PMBUS_POUT_MAX, PSC_POWER, false);
1247 if (pmbus_check_word_register(client, page,
1248 PMBUS_POUT_OP_WARN_LIMIT)) {
1249 i1 = data->num_sensors;
1250 pmbus_add_sensor(data, "power", "max", in_index, page,
1251 PMBUS_POUT_OP_WARN_LIMIT, PSC_POWER,
1255 if (need_alarm && (info->func[page] & PMBUS_HAVE_STATUS_IOUT))
1256 pmbus_add_boolean_reg(data, "power", "alarm",
1258 PB_STATUS_IOUT_BASE + page,
1260 | PB_POWER_LIMITING);
1262 if (pmbus_check_word_register(client, page,
1263 PMBUS_POUT_OP_FAULT_LIMIT)) {
1264 i1 = data->num_sensors;
1265 pmbus_add_sensor(data, "power", "crit", in_index, page,
1266 PMBUS_POUT_OP_FAULT_LIMIT, PSC_POWER,
1268 if (info->func[page] & PMBUS_HAVE_STATUS_IOUT)
1269 pmbus_add_boolean_reg(data, "power",
1280 * Temperature sensors
1283 for (page = 0; page < info->pages; page++) {
1286 for (t = 0; t < ARRAY_SIZE(pmbus_temp_registers); t++) {
1287 bool have_alarm = false;
1290 * A PMBus chip may support any combination of
1291 * temperature registers on any page. So we can not
1292 * abort after a failure to detect a register, but have
1293 * to continue checking for all registers on all pages.
1295 if (!(info->func[page] & pmbus_temp_flags[t]))
1298 if (!pmbus_check_word_register
1299 (client, page, pmbus_temp_registers[t]))
1302 i0 = data->num_sensors;
1303 pmbus_add_sensor(data, "temp", "input", in_index, page,
1304 pmbus_temp_registers[t],
1305 PSC_TEMPERATURE, true);
1308 * PMBus provides only one status register for TEMP1-3.
1309 * Thus, we can not use the status register to determine
1310 * which of the three sensors actually caused an alarm.
1311 * Always compare current temperature against the limit
1312 * registers to determine alarm conditions for a
1315 * Since there is only one set of limit registers for
1316 * up to three temperature sensors, we need to update
1317 * all limit registers after the limit was changed for
1318 * one of the sensors. This ensures that correct limits
1319 * are reported for all temperature sensors.
1321 if (pmbus_check_word_register
1322 (client, page, PMBUS_UT_WARN_LIMIT)) {
1323 i1 = data->num_sensors;
1324 pmbus_add_sensor(data, "temp", "min", in_index,
1325 page, PMBUS_UT_WARN_LIMIT,
1326 PSC_TEMPERATURE, true);
1327 if (info->func[page] & PMBUS_HAVE_STATUS_TEMP) {
1328 pmbus_add_boolean_cmp(data, "temp",
1329 "min_alarm", in_index, i1, i0,
1330 PB_STATUS_TEMP_BASE + page,
1331 PB_TEMP_UT_WARNING);
1335 if (pmbus_check_word_register(client, page,
1336 PMBUS_UT_FAULT_LIMIT)) {
1337 i1 = data->num_sensors;
1338 pmbus_add_sensor(data, "temp", "lcrit",
1340 PMBUS_UT_FAULT_LIMIT,
1341 PSC_TEMPERATURE, true);
1342 if (info->func[page] & PMBUS_HAVE_STATUS_TEMP) {
1343 pmbus_add_boolean_cmp(data, "temp",
1344 "lcrit_alarm", in_index, i1, i0,
1345 PB_STATUS_TEMP_BASE + page,
1350 if (pmbus_check_word_register
1351 (client, page, PMBUS_OT_WARN_LIMIT)) {
1352 i1 = data->num_sensors;
1353 pmbus_add_sensor(data, "temp", "max", in_index,
1354 page, PMBUS_OT_WARN_LIMIT,
1355 PSC_TEMPERATURE, true);
1356 if (info->func[page] & PMBUS_HAVE_STATUS_TEMP) {
1357 pmbus_add_boolean_cmp(data, "temp",
1358 "max_alarm", in_index, i0, i1,
1359 PB_STATUS_TEMP_BASE + page,
1360 PB_TEMP_OT_WARNING);
1364 if (pmbus_check_word_register(client, page,
1365 PMBUS_OT_FAULT_LIMIT)) {
1366 i1 = data->num_sensors;
1367 pmbus_add_sensor(data, "temp", "crit", in_index,
1368 page, PMBUS_OT_FAULT_LIMIT,
1369 PSC_TEMPERATURE, true);
1370 if (info->func[page] & PMBUS_HAVE_STATUS_TEMP) {
1371 pmbus_add_boolean_cmp(data, "temp",
1372 "crit_alarm", in_index, i0, i1,
1373 PB_STATUS_TEMP_BASE + page,
1379 * Last resort - we were not able to create any alarm
1380 * registers. Report alarm for all sensors using the
1381 * status register temperature alarm bit.
1384 pmbus_add_boolean_reg(data, "temp", "alarm",
1386 PB_STATUS_BASE + page,
1387 PB_STATUS_TEMPERATURE);
1396 for (page = 0; page < info->pages; page++) {
1399 for (f = 0; f < ARRAY_SIZE(pmbus_fan_registers); f++) {
1402 if (!(info->func[page] & pmbus_fan_flags[f]))
1405 if (!pmbus_check_word_register(client, page,
1406 pmbus_fan_registers[f])
1407 || !pmbus_check_byte_register(client, page,
1408 pmbus_fan_config_registers[f]))
1412 * Skip fan if not installed.
1413 * Each fan configuration register covers multiple fans,
1414 * so we have to do some magic.
1416 regval = pmbus_read_byte_data(client, page,
1417 pmbus_fan_config_registers[f]);
1419 (!(regval & (PB_FAN_1_INSTALLED >> ((f & 1) * 4)))))
1422 i0 = data->num_sensors;
1423 pmbus_add_sensor(data, "fan", "input", in_index, page,
1424 pmbus_fan_registers[f], PSC_FAN, true);
1427 * Each fan status register covers multiple fans,
1428 * so we have to do some magic.
1430 if ((info->func[page] & pmbus_fan_status_flags[f]) &&
1431 pmbus_check_byte_register(client,
1432 page, pmbus_fan_status_registers[f])) {
1435 if (f > 1) /* fan 3, 4 */
1436 base = PB_STATUS_FAN34_BASE + page;
1438 base = PB_STATUS_FAN_BASE + page;
1439 pmbus_add_boolean_reg(data, "fan", "alarm",
1441 PB_FAN_FAN1_WARNING >> (f & 1));
1442 pmbus_add_boolean_reg(data, "fan", "fault",
1444 PB_FAN_FAN1_FAULT >> (f & 1));
1452 * Identify chip parameters.
1453 * This function is called for all chips.
1455 static int pmbus_identify_common(struct i2c_client *client,
1456 struct pmbus_data *data)
1458 int vout_mode = -1, exponent;
1460 if (pmbus_check_byte_register(client, 0, PMBUS_VOUT_MODE))
1461 vout_mode = pmbus_read_byte_data(client, 0, PMBUS_VOUT_MODE);
1462 if (vout_mode >= 0 && vout_mode != 0xff) {
1464 * Not all chips support the VOUT_MODE command,
1465 * so a failure to read it is not an error.
1467 switch (vout_mode >> 5) {
1468 case 0: /* linear mode */
1469 if (data->info->direct[PSC_VOLTAGE_OUT])
1472 exponent = vout_mode & 0x1f;
1473 /* and sign-extend it */
1474 if (exponent & 0x10)
1476 data->exponent = exponent;
1478 case 2: /* direct mode */
1479 if (!data->info->direct[PSC_VOLTAGE_OUT])
1487 /* Determine maximum number of sensors, booleans, and labels */
1488 pmbus_find_max_attr(client, data);
1489 pmbus_clear_fault_page(client, 0);
1493 int pmbus_do_probe(struct i2c_client *client, const struct i2c_device_id *id,
1494 struct pmbus_driver_info *info)
1496 const struct pmbus_platform_data *pdata = client->dev.platform_data;
1497 struct pmbus_data *data;
1501 dev_err(&client->dev, "Missing chip information");
1505 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE
1506 | I2C_FUNC_SMBUS_BYTE_DATA
1507 | I2C_FUNC_SMBUS_WORD_DATA))
1510 data = kzalloc(sizeof(*data), GFP_KERNEL);
1512 dev_err(&client->dev, "No memory to allocate driver data\n");
1516 i2c_set_clientdata(client, data);
1517 mutex_init(&data->update_lock);
1520 * Bail out if status register or PMBus revision register
1523 if (i2c_smbus_read_byte_data(client, PMBUS_STATUS_BYTE) < 0
1524 || i2c_smbus_read_byte_data(client, PMBUS_REVISION) < 0) {
1525 dev_err(&client->dev,
1526 "Status or revision register not found\n");
1532 data->flags = pdata->flags;
1535 pmbus_clear_faults(client);
1537 if (info->identify) {
1538 ret = (*info->identify)(client, info);
1540 dev_err(&client->dev, "Chip identification failed\n");
1545 if (info->pages <= 0 || info->pages > PMBUS_PAGES) {
1546 dev_err(&client->dev, "Bad number of PMBus pages: %d\n",
1552 * Bail out if more than one page was configured, but we can not
1553 * select the highest page. This is an indication that the wrong
1554 * chip type was selected. Better bail out now than keep
1555 * returning errors later on.
1557 if (info->pages > 1 && pmbus_set_page(client, info->pages - 1) < 0) {
1558 dev_err(&client->dev, "Failed to select page %d\n",
1564 ret = pmbus_identify_common(client, data);
1566 dev_err(&client->dev, "Failed to identify chip capabilities\n");
1571 data->sensors = kzalloc(sizeof(struct pmbus_sensor) * data->max_sensors,
1573 if (!data->sensors) {
1574 dev_err(&client->dev, "No memory to allocate sensor data\n");
1578 data->booleans = kzalloc(sizeof(struct pmbus_boolean)
1579 * data->max_booleans, GFP_KERNEL);
1580 if (!data->booleans) {
1581 dev_err(&client->dev, "No memory to allocate boolean data\n");
1585 data->labels = kzalloc(sizeof(struct pmbus_label) * data->max_labels,
1587 if (!data->labels) {
1588 dev_err(&client->dev, "No memory to allocate label data\n");
1592 data->attributes = kzalloc(sizeof(struct attribute *)
1593 * data->max_attributes, GFP_KERNEL);
1594 if (!data->attributes) {
1595 dev_err(&client->dev, "No memory to allocate attribute data\n");
1599 pmbus_find_attributes(client, data);
1602 * If there are no attributes, something is wrong.
1603 * Bail out instead of trying to register nothing.
1605 if (!data->num_attributes) {
1606 dev_err(&client->dev, "No attributes found\n");
1608 goto out_attributes;
1611 /* Register sysfs hooks */
1612 data->group.attrs = data->attributes;
1613 ret = sysfs_create_group(&client->dev.kobj, &data->group);
1615 dev_err(&client->dev, "Failed to create sysfs entries\n");
1616 goto out_attributes;
1618 data->hwmon_dev = hwmon_device_register(&client->dev);
1619 if (IS_ERR(data->hwmon_dev)) {
1620 ret = PTR_ERR(data->hwmon_dev);
1621 dev_err(&client->dev, "Failed to register hwmon device\n");
1622 goto out_hwmon_device_register;
1626 out_hwmon_device_register:
1627 sysfs_remove_group(&client->dev.kobj, &data->group);
1629 kfree(data->attributes);
1631 kfree(data->labels);
1633 kfree(data->booleans);
1635 kfree(data->sensors);
1640 EXPORT_SYMBOL_GPL(pmbus_do_probe);
1642 int pmbus_do_remove(struct i2c_client *client)
1644 struct pmbus_data *data = i2c_get_clientdata(client);
1645 hwmon_device_unregister(data->hwmon_dev);
1646 sysfs_remove_group(&client->dev.kobj, &data->group);
1647 kfree(data->attributes);
1648 kfree(data->labels);
1649 kfree(data->booleans);
1650 kfree(data->sensors);
1654 EXPORT_SYMBOL_GPL(pmbus_do_remove);
1656 MODULE_AUTHOR("Guenter Roeck");
1657 MODULE_DESCRIPTION("PMBus core driver");
1658 MODULE_LICENSE("GPL");