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/math64.h>
24 #include <linux/module.h>
25 #include <linux/init.h>
26 #include <linux/err.h>
27 #include <linux/slab.h>
28 #include <linux/i2c.h>
29 #include <linux/hwmon.h>
30 #include <linux/hwmon-sysfs.h>
31 #include <linux/jiffies.h>
32 #include <linux/i2c/pmbus.h>
33 #include <linux/regulator/driver.h>
34 #include <linux/regulator/machine.h>
38 * Number of additional attribute pointers to allocate
39 * with each call to krealloc
41 #define PMBUS_ATTR_ALLOC_SIZE 32
44 * Index into status register array, per status register group
46 #define PB_STATUS_BASE 0
47 #define PB_STATUS_VOUT_BASE (PB_STATUS_BASE + PMBUS_PAGES)
48 #define PB_STATUS_IOUT_BASE (PB_STATUS_VOUT_BASE + PMBUS_PAGES)
49 #define PB_STATUS_FAN_BASE (PB_STATUS_IOUT_BASE + PMBUS_PAGES)
50 #define PB_STATUS_FAN34_BASE (PB_STATUS_FAN_BASE + PMBUS_PAGES)
51 #define PB_STATUS_TEMP_BASE (PB_STATUS_FAN34_BASE + PMBUS_PAGES)
52 #define PB_STATUS_INPUT_BASE (PB_STATUS_TEMP_BASE + PMBUS_PAGES)
53 #define PB_STATUS_VMON_BASE (PB_STATUS_INPUT_BASE + 1)
55 #define PB_NUM_STATUS_REG (PB_STATUS_VMON_BASE + 1)
57 #define PMBUS_NAME_SIZE 24
60 struct pmbus_sensor *next;
61 char name[PMBUS_NAME_SIZE]; /* sysfs sensor name */
62 struct device_attribute attribute;
63 u8 page; /* page number */
64 u16 reg; /* register */
65 enum pmbus_sensor_classes class; /* sensor class */
66 bool update; /* runtime sensor update needed */
67 int data; /* Sensor data.
68 Negative if there was a read error */
70 #define to_pmbus_sensor(_attr) \
71 container_of(_attr, struct pmbus_sensor, attribute)
73 struct pmbus_boolean {
74 char name[PMBUS_NAME_SIZE]; /* sysfs boolean name */
75 struct sensor_device_attribute attribute;
76 struct pmbus_sensor *s1;
77 struct pmbus_sensor *s2;
79 #define to_pmbus_boolean(_attr) \
80 container_of(_attr, struct pmbus_boolean, attribute)
83 char name[PMBUS_NAME_SIZE]; /* sysfs label name */
84 struct device_attribute attribute;
85 char label[PMBUS_NAME_SIZE]; /* label */
87 #define to_pmbus_label(_attr) \
88 container_of(_attr, struct pmbus_label, attribute)
92 struct device *hwmon_dev;
94 u32 flags; /* from platform data */
96 int exponent[PMBUS_PAGES];
97 /* linear mode: exponent for output voltages */
99 const struct pmbus_driver_info *info;
103 struct attribute_group group;
104 const struct attribute_group *groups[2];
106 struct pmbus_sensor *sensors;
108 struct mutex update_lock;
110 unsigned long last_updated; /* in jiffies */
113 * A single status register covers multiple attributes,
114 * so we keep them all together.
116 u8 status[PB_NUM_STATUS_REG];
122 void pmbus_clear_cache(struct i2c_client *client)
124 struct pmbus_data *data = i2c_get_clientdata(client);
128 EXPORT_SYMBOL_GPL(pmbus_clear_cache);
130 int pmbus_set_page(struct i2c_client *client, u8 page)
132 struct pmbus_data *data = i2c_get_clientdata(client);
136 if (page != data->currpage) {
137 rv = i2c_smbus_write_byte_data(client, PMBUS_PAGE, page);
138 newpage = i2c_smbus_read_byte_data(client, PMBUS_PAGE);
142 data->currpage = page;
146 EXPORT_SYMBOL_GPL(pmbus_set_page);
148 int pmbus_write_byte(struct i2c_client *client, int page, u8 value)
153 rv = pmbus_set_page(client, page);
158 return i2c_smbus_write_byte(client, value);
160 EXPORT_SYMBOL_GPL(pmbus_write_byte);
163 * _pmbus_write_byte() is similar to pmbus_write_byte(), but checks if
164 * a device specific mapping function exists and calls it if necessary.
166 static int _pmbus_write_byte(struct i2c_client *client, int page, u8 value)
168 struct pmbus_data *data = i2c_get_clientdata(client);
169 const struct pmbus_driver_info *info = data->info;
172 if (info->write_byte) {
173 status = info->write_byte(client, page, value);
174 if (status != -ENODATA)
177 return pmbus_write_byte(client, page, value);
180 int pmbus_write_word_data(struct i2c_client *client, u8 page, u8 reg, u16 word)
184 rv = pmbus_set_page(client, page);
188 return i2c_smbus_write_word_data(client, reg, word);
190 EXPORT_SYMBOL_GPL(pmbus_write_word_data);
193 * _pmbus_write_word_data() is similar to pmbus_write_word_data(), but checks if
194 * a device specific mapping function exists and calls it if necessary.
196 static int _pmbus_write_word_data(struct i2c_client *client, int page, int reg,
199 struct pmbus_data *data = i2c_get_clientdata(client);
200 const struct pmbus_driver_info *info = data->info;
203 if (info->write_word_data) {
204 status = info->write_word_data(client, page, reg, word);
205 if (status != -ENODATA)
208 if (reg >= PMBUS_VIRT_BASE)
210 return pmbus_write_word_data(client, page, reg, word);
213 int pmbus_read_word_data(struct i2c_client *client, u8 page, u8 reg)
217 rv = pmbus_set_page(client, page);
221 return i2c_smbus_read_word_data(client, reg);
223 EXPORT_SYMBOL_GPL(pmbus_read_word_data);
226 * _pmbus_read_word_data() is similar to pmbus_read_word_data(), but checks if
227 * a device specific mapping function exists and calls it if necessary.
229 static int _pmbus_read_word_data(struct i2c_client *client, int page, int reg)
231 struct pmbus_data *data = i2c_get_clientdata(client);
232 const struct pmbus_driver_info *info = data->info;
235 if (info->read_word_data) {
236 status = info->read_word_data(client, page, reg);
237 if (status != -ENODATA)
240 if (reg >= PMBUS_VIRT_BASE)
242 return pmbus_read_word_data(client, page, reg);
245 int pmbus_read_byte_data(struct i2c_client *client, int page, u8 reg)
250 rv = pmbus_set_page(client, page);
255 return i2c_smbus_read_byte_data(client, reg);
257 EXPORT_SYMBOL_GPL(pmbus_read_byte_data);
259 int pmbus_write_byte_data(struct i2c_client *client, int page, u8 reg, u8 value)
263 rv = pmbus_set_page(client, page);
267 return i2c_smbus_write_byte_data(client, reg, value);
269 EXPORT_SYMBOL_GPL(pmbus_write_byte_data);
271 int pmbus_update_byte_data(struct i2c_client *client, int page, u8 reg,
277 rv = pmbus_read_byte_data(client, page, reg);
281 tmp = (rv & ~mask) | (value & mask);
284 rv = pmbus_write_byte_data(client, page, reg, tmp);
288 EXPORT_SYMBOL_GPL(pmbus_update_byte_data);
291 * _pmbus_read_byte_data() is similar to pmbus_read_byte_data(), but checks if
292 * a device specific mapping function exists and calls it if necessary.
294 static int _pmbus_read_byte_data(struct i2c_client *client, int page, int reg)
296 struct pmbus_data *data = i2c_get_clientdata(client);
297 const struct pmbus_driver_info *info = data->info;
300 if (info->read_byte_data) {
301 status = info->read_byte_data(client, page, reg);
302 if (status != -ENODATA)
305 return pmbus_read_byte_data(client, page, reg);
308 static void pmbus_clear_fault_page(struct i2c_client *client, int page)
310 _pmbus_write_byte(client, page, PMBUS_CLEAR_FAULTS);
313 void pmbus_clear_faults(struct i2c_client *client)
315 struct pmbus_data *data = i2c_get_clientdata(client);
318 for (i = 0; i < data->info->pages; i++)
319 pmbus_clear_fault_page(client, i);
321 EXPORT_SYMBOL_GPL(pmbus_clear_faults);
323 static int pmbus_check_status_cml(struct i2c_client *client)
325 struct pmbus_data *data = i2c_get_clientdata(client);
328 status = _pmbus_read_byte_data(client, -1, data->status_register);
329 if (status < 0 || (status & PB_STATUS_CML)) {
330 status2 = _pmbus_read_byte_data(client, -1, PMBUS_STATUS_CML);
331 if (status2 < 0 || (status2 & PB_CML_FAULT_INVALID_COMMAND))
337 static bool pmbus_check_register(struct i2c_client *client,
338 int (*func)(struct i2c_client *client,
343 struct pmbus_data *data = i2c_get_clientdata(client);
345 rv = func(client, page, reg);
346 if (rv >= 0 && !(data->flags & PMBUS_SKIP_STATUS_CHECK))
347 rv = pmbus_check_status_cml(client);
348 pmbus_clear_fault_page(client, -1);
352 bool pmbus_check_byte_register(struct i2c_client *client, int page, int reg)
354 return pmbus_check_register(client, _pmbus_read_byte_data, page, reg);
356 EXPORT_SYMBOL_GPL(pmbus_check_byte_register);
358 bool pmbus_check_word_register(struct i2c_client *client, int page, int reg)
360 return pmbus_check_register(client, _pmbus_read_word_data, page, reg);
362 EXPORT_SYMBOL_GPL(pmbus_check_word_register);
364 const struct pmbus_driver_info *pmbus_get_driver_info(struct i2c_client *client)
366 struct pmbus_data *data = i2c_get_clientdata(client);
370 EXPORT_SYMBOL_GPL(pmbus_get_driver_info);
372 static struct _pmbus_status {
377 { PMBUS_HAVE_STATUS_VOUT, PB_STATUS_VOUT_BASE, PMBUS_STATUS_VOUT },
378 { PMBUS_HAVE_STATUS_IOUT, PB_STATUS_IOUT_BASE, PMBUS_STATUS_IOUT },
379 { PMBUS_HAVE_STATUS_TEMP, PB_STATUS_TEMP_BASE,
380 PMBUS_STATUS_TEMPERATURE },
381 { PMBUS_HAVE_STATUS_FAN12, PB_STATUS_FAN_BASE, PMBUS_STATUS_FAN_12 },
382 { PMBUS_HAVE_STATUS_FAN34, PB_STATUS_FAN34_BASE, PMBUS_STATUS_FAN_34 },
385 static struct pmbus_data *pmbus_update_device(struct device *dev)
387 struct i2c_client *client = to_i2c_client(dev->parent);
388 struct pmbus_data *data = i2c_get_clientdata(client);
389 const struct pmbus_driver_info *info = data->info;
390 struct pmbus_sensor *sensor;
392 mutex_lock(&data->update_lock);
393 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {
396 for (i = 0; i < info->pages; i++) {
397 data->status[PB_STATUS_BASE + i]
398 = _pmbus_read_byte_data(client, i,
399 data->status_register);
400 for (j = 0; j < ARRAY_SIZE(pmbus_status); j++) {
401 struct _pmbus_status *s = &pmbus_status[j];
403 if (!(info->func[i] & s->func))
405 data->status[s->base + i]
406 = _pmbus_read_byte_data(client, i,
411 if (info->func[0] & PMBUS_HAVE_STATUS_INPUT)
412 data->status[PB_STATUS_INPUT_BASE]
413 = _pmbus_read_byte_data(client, 0,
416 if (info->func[0] & PMBUS_HAVE_STATUS_VMON)
417 data->status[PB_STATUS_VMON_BASE]
418 = _pmbus_read_byte_data(client, 0,
419 PMBUS_VIRT_STATUS_VMON);
421 for (sensor = data->sensors; sensor; sensor = sensor->next) {
422 if (!data->valid || sensor->update)
424 = _pmbus_read_word_data(client,
428 pmbus_clear_faults(client);
429 data->last_updated = jiffies;
432 mutex_unlock(&data->update_lock);
437 * Convert linear sensor values to milli- or micro-units
438 * depending on sensor type.
440 static long pmbus_reg2data_linear(struct pmbus_data *data,
441 struct pmbus_sensor *sensor)
447 if (sensor->class == PSC_VOLTAGE_OUT) { /* LINEAR16 */
448 exponent = data->exponent[sensor->page];
449 mantissa = (u16) sensor->data;
450 } else { /* LINEAR11 */
451 exponent = ((s16)sensor->data) >> 11;
452 mantissa = ((s16)((sensor->data & 0x7ff) << 5)) >> 5;
457 /* scale result to milli-units for all sensors except fans */
458 if (sensor->class != PSC_FAN)
461 /* scale result to micro-units for power sensors */
462 if (sensor->class == PSC_POWER)
474 * Convert direct sensor values to milli- or micro-units
475 * depending on sensor type.
477 static long pmbus_reg2data_direct(struct pmbus_data *data,
478 struct pmbus_sensor *sensor)
480 s64 b, val = (s16)sensor->data;
483 m = data->info->m[sensor->class];
484 b = data->info->b[sensor->class];
485 R = data->info->R[sensor->class];
490 /* X = 1/m * (Y * 10^-R - b) */
492 /* scale result to milli-units for everything but fans */
493 if (sensor->class != PSC_FAN) {
498 /* scale result to micro-units for power sensors */
499 if (sensor->class == PSC_POWER) {
509 val = div_s64(val + 5LL, 10L); /* round closest */
513 val = div_s64(val - b, m);
514 return clamp_val(val, LONG_MIN, LONG_MAX);
518 * Convert VID sensor values to milli- or micro-units
519 * depending on sensor type.
521 static long pmbus_reg2data_vid(struct pmbus_data *data,
522 struct pmbus_sensor *sensor)
524 long val = sensor->data;
527 switch (data->info->vrm_version) {
529 if (val >= 0x02 && val <= 0xb2)
530 rv = DIV_ROUND_CLOSEST(160000 - (val - 2) * 625, 100);
534 rv = 250 + (val - 1) * 5;
540 static long pmbus_reg2data(struct pmbus_data *data, struct pmbus_sensor *sensor)
544 switch (data->info->format[sensor->class]) {
546 val = pmbus_reg2data_direct(data, sensor);
549 val = pmbus_reg2data_vid(data, sensor);
553 val = pmbus_reg2data_linear(data, sensor);
559 #define MAX_MANTISSA (1023 * 1000)
560 #define MIN_MANTISSA (511 * 1000)
562 static u16 pmbus_data2reg_linear(struct pmbus_data *data,
563 struct pmbus_sensor *sensor, long val)
565 s16 exponent = 0, mantissa;
566 bool negative = false;
572 if (sensor->class == PSC_VOLTAGE_OUT) {
573 /* LINEAR16 does not support negative voltages */
578 * For a static exponents, we don't have a choice
579 * but to adjust the value to it.
581 if (data->exponent[sensor->page] < 0)
582 val <<= -data->exponent[sensor->page];
584 val >>= data->exponent[sensor->page];
585 val = DIV_ROUND_CLOSEST(val, 1000);
594 /* Power is in uW. Convert to mW before converting. */
595 if (sensor->class == PSC_POWER)
596 val = DIV_ROUND_CLOSEST(val, 1000L);
599 * For simplicity, convert fan data to milli-units
600 * before calculating the exponent.
602 if (sensor->class == PSC_FAN)
605 /* Reduce large mantissa until it fits into 10 bit */
606 while (val >= MAX_MANTISSA && exponent < 15) {
610 /* Increase small mantissa to improve precision */
611 while (val < MIN_MANTISSA && exponent > -15) {
616 /* Convert mantissa from milli-units to units */
617 mantissa = DIV_ROUND_CLOSEST(val, 1000);
619 /* Ensure that resulting number is within range */
620 if (mantissa > 0x3ff)
625 mantissa = -mantissa;
627 /* Convert to 5 bit exponent, 11 bit mantissa */
628 return (mantissa & 0x7ff) | ((exponent << 11) & 0xf800);
631 static u16 pmbus_data2reg_direct(struct pmbus_data *data,
632 struct pmbus_sensor *sensor, long val)
637 m = data->info->m[sensor->class];
638 b = data->info->b[sensor->class];
639 R = data->info->R[sensor->class];
641 /* Power is in uW. Adjust R and b. */
642 if (sensor->class == PSC_POWER) {
647 /* Calculate Y = (m * X + b) * 10^R */
648 if (sensor->class != PSC_FAN) {
649 R -= 3; /* Adjust R and b for data in milli-units */
652 val64 = val64 * m + b;
659 val64 = div_s64(val64 + 5LL, 10L); /* round closest */
663 return (u16)clamp_val(val64, S16_MIN, S16_MAX);
666 static u16 pmbus_data2reg_vid(struct pmbus_data *data,
667 struct pmbus_sensor *sensor, long val)
669 val = clamp_val(val, 500, 1600);
671 return 2 + DIV_ROUND_CLOSEST((1600 - val) * 100, 625);
674 static u16 pmbus_data2reg(struct pmbus_data *data,
675 struct pmbus_sensor *sensor, long val)
679 switch (data->info->format[sensor->class]) {
681 regval = pmbus_data2reg_direct(data, sensor, val);
684 regval = pmbus_data2reg_vid(data, sensor, val);
688 regval = pmbus_data2reg_linear(data, sensor, val);
695 * Return boolean calculated from converted data.
696 * <index> defines a status register index and mask.
697 * The mask is in the lower 8 bits, the register index is in bits 8..23.
699 * The associated pmbus_boolean structure contains optional pointers to two
700 * sensor attributes. If specified, those attributes are compared against each
701 * other to determine if a limit has been exceeded.
703 * If the sensor attribute pointers are NULL, the function returns true if
704 * (status[reg] & mask) is true.
706 * If sensor attribute pointers are provided, a comparison against a specified
707 * limit has to be performed to determine the boolean result.
708 * In this case, the function returns true if v1 >= v2 (where v1 and v2 are
709 * sensor values referenced by sensor attribute pointers s1 and s2).
711 * To determine if an object exceeds upper limits, specify <s1,s2> = <v,limit>.
712 * To determine if an object exceeds lower limits, specify <s1,s2> = <limit,v>.
714 * If a negative value is stored in any of the referenced registers, this value
715 * reflects an error code which will be returned.
717 static int pmbus_get_boolean(struct pmbus_data *data, struct pmbus_boolean *b,
720 struct pmbus_sensor *s1 = b->s1;
721 struct pmbus_sensor *s2 = b->s2;
722 u16 reg = (index >> 8) & 0xffff;
723 u8 mask = index & 0xff;
727 status = data->status[reg];
731 regval = status & mask;
734 } else if (!s1 || !s2) {
735 WARN(1, "Bad boolean descriptor %p: s1=%p, s2=%p\n", b, s1, s2);
745 v1 = pmbus_reg2data(data, s1);
746 v2 = pmbus_reg2data(data, s2);
747 ret = !!(regval && v1 >= v2);
752 static ssize_t pmbus_show_boolean(struct device *dev,
753 struct device_attribute *da, char *buf)
755 struct sensor_device_attribute *attr = to_sensor_dev_attr(da);
756 struct pmbus_boolean *boolean = to_pmbus_boolean(attr);
757 struct pmbus_data *data = pmbus_update_device(dev);
760 val = pmbus_get_boolean(data, boolean, attr->index);
763 return snprintf(buf, PAGE_SIZE, "%d\n", val);
766 static ssize_t pmbus_show_sensor(struct device *dev,
767 struct device_attribute *devattr, char *buf)
769 struct pmbus_data *data = pmbus_update_device(dev);
770 struct pmbus_sensor *sensor = to_pmbus_sensor(devattr);
772 if (sensor->data < 0)
775 return snprintf(buf, PAGE_SIZE, "%ld\n", pmbus_reg2data(data, sensor));
778 static ssize_t pmbus_set_sensor(struct device *dev,
779 struct device_attribute *devattr,
780 const char *buf, size_t count)
782 struct i2c_client *client = to_i2c_client(dev->parent);
783 struct pmbus_data *data = i2c_get_clientdata(client);
784 struct pmbus_sensor *sensor = to_pmbus_sensor(devattr);
790 if (kstrtol(buf, 10, &val) < 0)
793 mutex_lock(&data->update_lock);
794 regval = pmbus_data2reg(data, sensor, val);
795 ret = _pmbus_write_word_data(client, sensor->page, sensor->reg, regval);
799 sensor->data = regval;
800 mutex_unlock(&data->update_lock);
804 static ssize_t pmbus_show_label(struct device *dev,
805 struct device_attribute *da, char *buf)
807 struct pmbus_label *label = to_pmbus_label(da);
809 return snprintf(buf, PAGE_SIZE, "%s\n", label->label);
812 static int pmbus_add_attribute(struct pmbus_data *data, struct attribute *attr)
814 if (data->num_attributes >= data->max_attributes - 1) {
815 int new_max_attrs = data->max_attributes + PMBUS_ATTR_ALLOC_SIZE;
816 void *new_attrs = krealloc(data->group.attrs,
817 new_max_attrs * sizeof(void *),
821 data->group.attrs = new_attrs;
822 data->max_attributes = new_max_attrs;
825 data->group.attrs[data->num_attributes++] = attr;
826 data->group.attrs[data->num_attributes] = NULL;
830 static void pmbus_dev_attr_init(struct device_attribute *dev_attr,
833 ssize_t (*show)(struct device *dev,
834 struct device_attribute *attr,
836 ssize_t (*store)(struct device *dev,
837 struct device_attribute *attr,
838 const char *buf, size_t count))
840 sysfs_attr_init(&dev_attr->attr);
841 dev_attr->attr.name = name;
842 dev_attr->attr.mode = mode;
843 dev_attr->show = show;
844 dev_attr->store = store;
847 static void pmbus_attr_init(struct sensor_device_attribute *a,
850 ssize_t (*show)(struct device *dev,
851 struct device_attribute *attr,
853 ssize_t (*store)(struct device *dev,
854 struct device_attribute *attr,
855 const char *buf, size_t count),
858 pmbus_dev_attr_init(&a->dev_attr, name, mode, show, store);
862 static int pmbus_add_boolean(struct pmbus_data *data,
863 const char *name, const char *type, int seq,
864 struct pmbus_sensor *s1,
865 struct pmbus_sensor *s2,
868 struct pmbus_boolean *boolean;
869 struct sensor_device_attribute *a;
871 boolean = devm_kzalloc(data->dev, sizeof(*boolean), GFP_KERNEL);
875 a = &boolean->attribute;
877 snprintf(boolean->name, sizeof(boolean->name), "%s%d_%s",
881 pmbus_attr_init(a, boolean->name, S_IRUGO, pmbus_show_boolean, NULL,
884 return pmbus_add_attribute(data, &a->dev_attr.attr);
887 static struct pmbus_sensor *pmbus_add_sensor(struct pmbus_data *data,
888 const char *name, const char *type,
889 int seq, int page, int reg,
890 enum pmbus_sensor_classes class,
891 bool update, bool readonly)
893 struct pmbus_sensor *sensor;
894 struct device_attribute *a;
896 sensor = devm_kzalloc(data->dev, sizeof(*sensor), GFP_KERNEL);
899 a = &sensor->attribute;
901 snprintf(sensor->name, sizeof(sensor->name), "%s%d_%s",
905 sensor->class = class;
906 sensor->update = update;
907 pmbus_dev_attr_init(a, sensor->name,
908 readonly ? S_IRUGO : S_IRUGO | S_IWUSR,
909 pmbus_show_sensor, pmbus_set_sensor);
911 if (pmbus_add_attribute(data, &a->attr))
914 sensor->next = data->sensors;
915 data->sensors = sensor;
920 static int pmbus_add_label(struct pmbus_data *data,
921 const char *name, int seq,
922 const char *lstring, int index)
924 struct pmbus_label *label;
925 struct device_attribute *a;
927 label = devm_kzalloc(data->dev, sizeof(*label), GFP_KERNEL);
931 a = &label->attribute;
933 snprintf(label->name, sizeof(label->name), "%s%d_label", name, seq);
935 strncpy(label->label, lstring, sizeof(label->label) - 1);
937 snprintf(label->label, sizeof(label->label), "%s%d", lstring,
940 pmbus_dev_attr_init(a, label->name, S_IRUGO, pmbus_show_label, NULL);
941 return pmbus_add_attribute(data, &a->attr);
945 * Search for attributes. Allocate sensors, booleans, and labels as needed.
949 * The pmbus_limit_attr structure describes a single limit attribute
950 * and its associated alarm attribute.
952 struct pmbus_limit_attr {
953 u16 reg; /* Limit register */
954 u16 sbit; /* Alarm attribute status bit */
955 bool update; /* True if register needs updates */
956 bool low; /* True if low limit; for limits with compare
958 const char *attr; /* Attribute name */
959 const char *alarm; /* Alarm attribute name */
963 * The pmbus_sensor_attr structure describes one sensor attribute. This
964 * description includes a reference to the associated limit attributes.
966 struct pmbus_sensor_attr {
967 u16 reg; /* sensor register */
968 u8 gbit; /* generic status bit */
969 u8 nlimit; /* # of limit registers */
970 enum pmbus_sensor_classes class;/* sensor class */
971 const char *label; /* sensor label */
972 bool paged; /* true if paged sensor */
973 bool update; /* true if update needed */
974 bool compare; /* true if compare function needed */
975 u32 func; /* sensor mask */
976 u32 sfunc; /* sensor status mask */
977 int sbase; /* status base register */
978 const struct pmbus_limit_attr *limit;/* limit registers */
982 * Add a set of limit attributes and, if supported, the associated
984 * returns 0 if no alarm register found, 1 if an alarm register was found,
987 static int pmbus_add_limit_attrs(struct i2c_client *client,
988 struct pmbus_data *data,
989 const struct pmbus_driver_info *info,
990 const char *name, int index, int page,
991 struct pmbus_sensor *base,
992 const struct pmbus_sensor_attr *attr)
994 const struct pmbus_limit_attr *l = attr->limit;
995 int nlimit = attr->nlimit;
998 struct pmbus_sensor *curr;
1000 for (i = 0; i < nlimit; i++) {
1001 if (pmbus_check_word_register(client, page, l->reg)) {
1002 curr = pmbus_add_sensor(data, name, l->attr, index,
1003 page, l->reg, attr->class,
1004 attr->update || l->update,
1008 if (l->sbit && (info->func[page] & attr->sfunc)) {
1009 ret = pmbus_add_boolean(data, name,
1011 attr->compare ? l->low ? curr : base
1013 attr->compare ? l->low ? base : curr
1015 attr->sbase + page, l->sbit);
1026 static int pmbus_add_sensor_attrs_one(struct i2c_client *client,
1027 struct pmbus_data *data,
1028 const struct pmbus_driver_info *info,
1030 int index, int page,
1031 const struct pmbus_sensor_attr *attr,
1034 struct pmbus_sensor *base;
1038 ret = pmbus_add_label(data, name, index, attr->label,
1039 paged ? page + 1 : 0);
1043 base = pmbus_add_sensor(data, name, "input", index, page, attr->reg,
1044 attr->class, true, true);
1048 ret = pmbus_add_limit_attrs(client, data, info, name,
1049 index, page, base, attr);
1053 * Add generic alarm attribute only if there are no individual
1054 * alarm attributes, if there is a global alarm bit, and if
1055 * the generic status register for this page is accessible.
1057 if (!ret && attr->gbit &&
1058 pmbus_check_byte_register(client, page,
1059 data->status_register)) {
1060 ret = pmbus_add_boolean(data, name, "alarm", index,
1062 PB_STATUS_BASE + page,
1071 static bool pmbus_sensor_is_paged(const struct pmbus_driver_info *info,
1072 const struct pmbus_sensor_attr *attr)
1080 * Some attributes may be present on more than one page despite
1081 * not being marked with the paged attribute. If that is the case,
1082 * then treat the sensor as being paged and add the page suffix to the
1084 * We don't just add the paged attribute to all such attributes, in
1085 * order to maintain the un-suffixed labels in the case where the
1086 * attribute is only on page 0.
1088 for (p = 1; p < info->pages; p++) {
1089 if (info->func[p] & attr->func)
1095 static int pmbus_add_sensor_attrs(struct i2c_client *client,
1096 struct pmbus_data *data,
1098 const struct pmbus_sensor_attr *attrs,
1101 const struct pmbus_driver_info *info = data->info;
1106 for (i = 0; i < nattrs; i++) {
1108 bool paged = pmbus_sensor_is_paged(info, attrs);
1110 pages = paged ? info->pages : 1;
1111 for (page = 0; page < pages; page++) {
1112 if (!(info->func[page] & attrs->func))
1114 ret = pmbus_add_sensor_attrs_one(client, data, info,
1126 static const struct pmbus_limit_attr vin_limit_attrs[] = {
1128 .reg = PMBUS_VIN_UV_WARN_LIMIT,
1130 .alarm = "min_alarm",
1131 .sbit = PB_VOLTAGE_UV_WARNING,
1133 .reg = PMBUS_VIN_UV_FAULT_LIMIT,
1135 .alarm = "lcrit_alarm",
1136 .sbit = PB_VOLTAGE_UV_FAULT,
1138 .reg = PMBUS_VIN_OV_WARN_LIMIT,
1140 .alarm = "max_alarm",
1141 .sbit = PB_VOLTAGE_OV_WARNING,
1143 .reg = PMBUS_VIN_OV_FAULT_LIMIT,
1145 .alarm = "crit_alarm",
1146 .sbit = PB_VOLTAGE_OV_FAULT,
1148 .reg = PMBUS_VIRT_READ_VIN_AVG,
1152 .reg = PMBUS_VIRT_READ_VIN_MIN,
1156 .reg = PMBUS_VIRT_READ_VIN_MAX,
1160 .reg = PMBUS_VIRT_RESET_VIN_HISTORY,
1161 .attr = "reset_history",
1165 static const struct pmbus_limit_attr vmon_limit_attrs[] = {
1167 .reg = PMBUS_VIRT_VMON_UV_WARN_LIMIT,
1169 .alarm = "min_alarm",
1170 .sbit = PB_VOLTAGE_UV_WARNING,
1172 .reg = PMBUS_VIRT_VMON_UV_FAULT_LIMIT,
1174 .alarm = "lcrit_alarm",
1175 .sbit = PB_VOLTAGE_UV_FAULT,
1177 .reg = PMBUS_VIRT_VMON_OV_WARN_LIMIT,
1179 .alarm = "max_alarm",
1180 .sbit = PB_VOLTAGE_OV_WARNING,
1182 .reg = PMBUS_VIRT_VMON_OV_FAULT_LIMIT,
1184 .alarm = "crit_alarm",
1185 .sbit = PB_VOLTAGE_OV_FAULT,
1189 static const struct pmbus_limit_attr vout_limit_attrs[] = {
1191 .reg = PMBUS_VOUT_UV_WARN_LIMIT,
1193 .alarm = "min_alarm",
1194 .sbit = PB_VOLTAGE_UV_WARNING,
1196 .reg = PMBUS_VOUT_UV_FAULT_LIMIT,
1198 .alarm = "lcrit_alarm",
1199 .sbit = PB_VOLTAGE_UV_FAULT,
1201 .reg = PMBUS_VOUT_OV_WARN_LIMIT,
1203 .alarm = "max_alarm",
1204 .sbit = PB_VOLTAGE_OV_WARNING,
1206 .reg = PMBUS_VOUT_OV_FAULT_LIMIT,
1208 .alarm = "crit_alarm",
1209 .sbit = PB_VOLTAGE_OV_FAULT,
1211 .reg = PMBUS_VIRT_READ_VOUT_AVG,
1215 .reg = PMBUS_VIRT_READ_VOUT_MIN,
1219 .reg = PMBUS_VIRT_READ_VOUT_MAX,
1223 .reg = PMBUS_VIRT_RESET_VOUT_HISTORY,
1224 .attr = "reset_history",
1228 static const struct pmbus_sensor_attr voltage_attributes[] = {
1230 .reg = PMBUS_READ_VIN,
1231 .class = PSC_VOLTAGE_IN,
1233 .func = PMBUS_HAVE_VIN,
1234 .sfunc = PMBUS_HAVE_STATUS_INPUT,
1235 .sbase = PB_STATUS_INPUT_BASE,
1236 .gbit = PB_STATUS_VIN_UV,
1237 .limit = vin_limit_attrs,
1238 .nlimit = ARRAY_SIZE(vin_limit_attrs),
1240 .reg = PMBUS_VIRT_READ_VMON,
1241 .class = PSC_VOLTAGE_IN,
1243 .func = PMBUS_HAVE_VMON,
1244 .sfunc = PMBUS_HAVE_STATUS_VMON,
1245 .sbase = PB_STATUS_VMON_BASE,
1246 .limit = vmon_limit_attrs,
1247 .nlimit = ARRAY_SIZE(vmon_limit_attrs),
1249 .reg = PMBUS_READ_VCAP,
1250 .class = PSC_VOLTAGE_IN,
1252 .func = PMBUS_HAVE_VCAP,
1254 .reg = PMBUS_READ_VOUT,
1255 .class = PSC_VOLTAGE_OUT,
1258 .func = PMBUS_HAVE_VOUT,
1259 .sfunc = PMBUS_HAVE_STATUS_VOUT,
1260 .sbase = PB_STATUS_VOUT_BASE,
1261 .gbit = PB_STATUS_VOUT_OV,
1262 .limit = vout_limit_attrs,
1263 .nlimit = ARRAY_SIZE(vout_limit_attrs),
1267 /* Current attributes */
1269 static const struct pmbus_limit_attr iin_limit_attrs[] = {
1271 .reg = PMBUS_IIN_OC_WARN_LIMIT,
1273 .alarm = "max_alarm",
1274 .sbit = PB_IIN_OC_WARNING,
1276 .reg = PMBUS_IIN_OC_FAULT_LIMIT,
1278 .alarm = "crit_alarm",
1279 .sbit = PB_IIN_OC_FAULT,
1281 .reg = PMBUS_VIRT_READ_IIN_AVG,
1285 .reg = PMBUS_VIRT_READ_IIN_MIN,
1289 .reg = PMBUS_VIRT_READ_IIN_MAX,
1293 .reg = PMBUS_VIRT_RESET_IIN_HISTORY,
1294 .attr = "reset_history",
1298 static const struct pmbus_limit_attr iout_limit_attrs[] = {
1300 .reg = PMBUS_IOUT_OC_WARN_LIMIT,
1302 .alarm = "max_alarm",
1303 .sbit = PB_IOUT_OC_WARNING,
1305 .reg = PMBUS_IOUT_UC_FAULT_LIMIT,
1307 .alarm = "lcrit_alarm",
1308 .sbit = PB_IOUT_UC_FAULT,
1310 .reg = PMBUS_IOUT_OC_FAULT_LIMIT,
1312 .alarm = "crit_alarm",
1313 .sbit = PB_IOUT_OC_FAULT,
1315 .reg = PMBUS_VIRT_READ_IOUT_AVG,
1319 .reg = PMBUS_VIRT_READ_IOUT_MIN,
1323 .reg = PMBUS_VIRT_READ_IOUT_MAX,
1327 .reg = PMBUS_VIRT_RESET_IOUT_HISTORY,
1328 .attr = "reset_history",
1332 static const struct pmbus_sensor_attr current_attributes[] = {
1334 .reg = PMBUS_READ_IIN,
1335 .class = PSC_CURRENT_IN,
1337 .func = PMBUS_HAVE_IIN,
1338 .sfunc = PMBUS_HAVE_STATUS_INPUT,
1339 .sbase = PB_STATUS_INPUT_BASE,
1340 .limit = iin_limit_attrs,
1341 .nlimit = ARRAY_SIZE(iin_limit_attrs),
1343 .reg = PMBUS_READ_IOUT,
1344 .class = PSC_CURRENT_OUT,
1347 .func = PMBUS_HAVE_IOUT,
1348 .sfunc = PMBUS_HAVE_STATUS_IOUT,
1349 .sbase = PB_STATUS_IOUT_BASE,
1350 .gbit = PB_STATUS_IOUT_OC,
1351 .limit = iout_limit_attrs,
1352 .nlimit = ARRAY_SIZE(iout_limit_attrs),
1356 /* Power attributes */
1358 static const struct pmbus_limit_attr pin_limit_attrs[] = {
1360 .reg = PMBUS_PIN_OP_WARN_LIMIT,
1363 .sbit = PB_PIN_OP_WARNING,
1365 .reg = PMBUS_VIRT_READ_PIN_AVG,
1369 .reg = PMBUS_VIRT_READ_PIN_MIN,
1371 .attr = "input_lowest",
1373 .reg = PMBUS_VIRT_READ_PIN_MAX,
1375 .attr = "input_highest",
1377 .reg = PMBUS_VIRT_RESET_PIN_HISTORY,
1378 .attr = "reset_history",
1382 static const struct pmbus_limit_attr pout_limit_attrs[] = {
1384 .reg = PMBUS_POUT_MAX,
1386 .alarm = "cap_alarm",
1387 .sbit = PB_POWER_LIMITING,
1389 .reg = PMBUS_POUT_OP_WARN_LIMIT,
1391 .alarm = "max_alarm",
1392 .sbit = PB_POUT_OP_WARNING,
1394 .reg = PMBUS_POUT_OP_FAULT_LIMIT,
1396 .alarm = "crit_alarm",
1397 .sbit = PB_POUT_OP_FAULT,
1399 .reg = PMBUS_VIRT_READ_POUT_AVG,
1403 .reg = PMBUS_VIRT_READ_POUT_MIN,
1405 .attr = "input_lowest",
1407 .reg = PMBUS_VIRT_READ_POUT_MAX,
1409 .attr = "input_highest",
1411 .reg = PMBUS_VIRT_RESET_POUT_HISTORY,
1412 .attr = "reset_history",
1416 static const struct pmbus_sensor_attr power_attributes[] = {
1418 .reg = PMBUS_READ_PIN,
1421 .func = PMBUS_HAVE_PIN,
1422 .sfunc = PMBUS_HAVE_STATUS_INPUT,
1423 .sbase = PB_STATUS_INPUT_BASE,
1424 .limit = pin_limit_attrs,
1425 .nlimit = ARRAY_SIZE(pin_limit_attrs),
1427 .reg = PMBUS_READ_POUT,
1431 .func = PMBUS_HAVE_POUT,
1432 .sfunc = PMBUS_HAVE_STATUS_IOUT,
1433 .sbase = PB_STATUS_IOUT_BASE,
1434 .limit = pout_limit_attrs,
1435 .nlimit = ARRAY_SIZE(pout_limit_attrs),
1439 /* Temperature atributes */
1441 static const struct pmbus_limit_attr temp_limit_attrs[] = {
1443 .reg = PMBUS_UT_WARN_LIMIT,
1446 .alarm = "min_alarm",
1447 .sbit = PB_TEMP_UT_WARNING,
1449 .reg = PMBUS_UT_FAULT_LIMIT,
1452 .alarm = "lcrit_alarm",
1453 .sbit = PB_TEMP_UT_FAULT,
1455 .reg = PMBUS_OT_WARN_LIMIT,
1457 .alarm = "max_alarm",
1458 .sbit = PB_TEMP_OT_WARNING,
1460 .reg = PMBUS_OT_FAULT_LIMIT,
1462 .alarm = "crit_alarm",
1463 .sbit = PB_TEMP_OT_FAULT,
1465 .reg = PMBUS_VIRT_READ_TEMP_MIN,
1468 .reg = PMBUS_VIRT_READ_TEMP_AVG,
1471 .reg = PMBUS_VIRT_READ_TEMP_MAX,
1474 .reg = PMBUS_VIRT_RESET_TEMP_HISTORY,
1475 .attr = "reset_history",
1479 static const struct pmbus_limit_attr temp_limit_attrs2[] = {
1481 .reg = PMBUS_UT_WARN_LIMIT,
1484 .alarm = "min_alarm",
1485 .sbit = PB_TEMP_UT_WARNING,
1487 .reg = PMBUS_UT_FAULT_LIMIT,
1490 .alarm = "lcrit_alarm",
1491 .sbit = PB_TEMP_UT_FAULT,
1493 .reg = PMBUS_OT_WARN_LIMIT,
1495 .alarm = "max_alarm",
1496 .sbit = PB_TEMP_OT_WARNING,
1498 .reg = PMBUS_OT_FAULT_LIMIT,
1500 .alarm = "crit_alarm",
1501 .sbit = PB_TEMP_OT_FAULT,
1503 .reg = PMBUS_VIRT_READ_TEMP2_MIN,
1506 .reg = PMBUS_VIRT_READ_TEMP2_AVG,
1509 .reg = PMBUS_VIRT_READ_TEMP2_MAX,
1512 .reg = PMBUS_VIRT_RESET_TEMP2_HISTORY,
1513 .attr = "reset_history",
1517 static const struct pmbus_limit_attr temp_limit_attrs3[] = {
1519 .reg = PMBUS_UT_WARN_LIMIT,
1522 .alarm = "min_alarm",
1523 .sbit = PB_TEMP_UT_WARNING,
1525 .reg = PMBUS_UT_FAULT_LIMIT,
1528 .alarm = "lcrit_alarm",
1529 .sbit = PB_TEMP_UT_FAULT,
1531 .reg = PMBUS_OT_WARN_LIMIT,
1533 .alarm = "max_alarm",
1534 .sbit = PB_TEMP_OT_WARNING,
1536 .reg = PMBUS_OT_FAULT_LIMIT,
1538 .alarm = "crit_alarm",
1539 .sbit = PB_TEMP_OT_FAULT,
1543 static const struct pmbus_sensor_attr temp_attributes[] = {
1545 .reg = PMBUS_READ_TEMPERATURE_1,
1546 .class = PSC_TEMPERATURE,
1550 .func = PMBUS_HAVE_TEMP,
1551 .sfunc = PMBUS_HAVE_STATUS_TEMP,
1552 .sbase = PB_STATUS_TEMP_BASE,
1553 .gbit = PB_STATUS_TEMPERATURE,
1554 .limit = temp_limit_attrs,
1555 .nlimit = ARRAY_SIZE(temp_limit_attrs),
1557 .reg = PMBUS_READ_TEMPERATURE_2,
1558 .class = PSC_TEMPERATURE,
1562 .func = PMBUS_HAVE_TEMP2,
1563 .sfunc = PMBUS_HAVE_STATUS_TEMP,
1564 .sbase = PB_STATUS_TEMP_BASE,
1565 .gbit = PB_STATUS_TEMPERATURE,
1566 .limit = temp_limit_attrs2,
1567 .nlimit = ARRAY_SIZE(temp_limit_attrs2),
1569 .reg = PMBUS_READ_TEMPERATURE_3,
1570 .class = PSC_TEMPERATURE,
1574 .func = PMBUS_HAVE_TEMP3,
1575 .sfunc = PMBUS_HAVE_STATUS_TEMP,
1576 .sbase = PB_STATUS_TEMP_BASE,
1577 .gbit = PB_STATUS_TEMPERATURE,
1578 .limit = temp_limit_attrs3,
1579 .nlimit = ARRAY_SIZE(temp_limit_attrs3),
1583 static const int pmbus_fan_registers[] = {
1584 PMBUS_READ_FAN_SPEED_1,
1585 PMBUS_READ_FAN_SPEED_2,
1586 PMBUS_READ_FAN_SPEED_3,
1587 PMBUS_READ_FAN_SPEED_4
1590 static const int pmbus_fan_config_registers[] = {
1591 PMBUS_FAN_CONFIG_12,
1592 PMBUS_FAN_CONFIG_12,
1593 PMBUS_FAN_CONFIG_34,
1597 static const int pmbus_fan_status_registers[] = {
1598 PMBUS_STATUS_FAN_12,
1599 PMBUS_STATUS_FAN_12,
1600 PMBUS_STATUS_FAN_34,
1604 static const u32 pmbus_fan_flags[] = {
1611 static const u32 pmbus_fan_status_flags[] = {
1612 PMBUS_HAVE_STATUS_FAN12,
1613 PMBUS_HAVE_STATUS_FAN12,
1614 PMBUS_HAVE_STATUS_FAN34,
1615 PMBUS_HAVE_STATUS_FAN34
1619 static int pmbus_add_fan_attributes(struct i2c_client *client,
1620 struct pmbus_data *data)
1622 const struct pmbus_driver_info *info = data->info;
1627 for (page = 0; page < info->pages; page++) {
1630 for (f = 0; f < ARRAY_SIZE(pmbus_fan_registers); f++) {
1633 if (!(info->func[page] & pmbus_fan_flags[f]))
1636 if (!pmbus_check_word_register(client, page,
1637 pmbus_fan_registers[f]))
1641 * Skip fan if not installed.
1642 * Each fan configuration register covers multiple fans,
1643 * so we have to do some magic.
1645 regval = _pmbus_read_byte_data(client, page,
1646 pmbus_fan_config_registers[f]);
1648 (!(regval & (PB_FAN_1_INSTALLED >> ((f & 1) * 4)))))
1651 if (pmbus_add_sensor(data, "fan", "input", index,
1652 page, pmbus_fan_registers[f],
1653 PSC_FAN, true, true) == NULL)
1657 * Each fan status register covers multiple fans,
1658 * so we have to do some magic.
1660 if ((info->func[page] & pmbus_fan_status_flags[f]) &&
1661 pmbus_check_byte_register(client,
1662 page, pmbus_fan_status_registers[f])) {
1665 if (f > 1) /* fan 3, 4 */
1666 base = PB_STATUS_FAN34_BASE + page;
1668 base = PB_STATUS_FAN_BASE + page;
1669 ret = pmbus_add_boolean(data, "fan",
1670 "alarm", index, NULL, NULL, base,
1671 PB_FAN_FAN1_WARNING >> (f & 1));
1674 ret = pmbus_add_boolean(data, "fan",
1675 "fault", index, NULL, NULL, base,
1676 PB_FAN_FAN1_FAULT >> (f & 1));
1686 static int pmbus_find_attributes(struct i2c_client *client,
1687 struct pmbus_data *data)
1691 /* Voltage sensors */
1692 ret = pmbus_add_sensor_attrs(client, data, "in", voltage_attributes,
1693 ARRAY_SIZE(voltage_attributes));
1697 /* Current sensors */
1698 ret = pmbus_add_sensor_attrs(client, data, "curr", current_attributes,
1699 ARRAY_SIZE(current_attributes));
1704 ret = pmbus_add_sensor_attrs(client, data, "power", power_attributes,
1705 ARRAY_SIZE(power_attributes));
1709 /* Temperature sensors */
1710 ret = pmbus_add_sensor_attrs(client, data, "temp", temp_attributes,
1711 ARRAY_SIZE(temp_attributes));
1716 ret = pmbus_add_fan_attributes(client, data);
1721 * Identify chip parameters.
1722 * This function is called for all chips.
1724 static int pmbus_identify_common(struct i2c_client *client,
1725 struct pmbus_data *data, int page)
1729 if (pmbus_check_byte_register(client, page, PMBUS_VOUT_MODE))
1730 vout_mode = _pmbus_read_byte_data(client, page,
1732 if (vout_mode >= 0 && vout_mode != 0xff) {
1734 * Not all chips support the VOUT_MODE command,
1735 * so a failure to read it is not an error.
1737 switch (vout_mode >> 5) {
1738 case 0: /* linear mode */
1739 if (data->info->format[PSC_VOLTAGE_OUT] != linear)
1742 data->exponent[page] = ((s8)(vout_mode << 3)) >> 3;
1744 case 1: /* VID mode */
1745 if (data->info->format[PSC_VOLTAGE_OUT] != vid)
1748 case 2: /* direct mode */
1749 if (data->info->format[PSC_VOLTAGE_OUT] != direct)
1757 pmbus_clear_fault_page(client, page);
1761 static int pmbus_init_common(struct i2c_client *client, struct pmbus_data *data,
1762 struct pmbus_driver_info *info)
1764 struct device *dev = &client->dev;
1768 * Some PMBus chips don't support PMBUS_STATUS_BYTE, so try
1769 * to use PMBUS_STATUS_WORD instead if that is the case.
1770 * Bail out if both registers are not supported.
1772 data->status_register = PMBUS_STATUS_BYTE;
1773 ret = i2c_smbus_read_byte_data(client, PMBUS_STATUS_BYTE);
1774 if (ret < 0 || ret == 0xff) {
1775 data->status_register = PMBUS_STATUS_WORD;
1776 ret = i2c_smbus_read_word_data(client, PMBUS_STATUS_WORD);
1777 if (ret < 0 || ret == 0xffff) {
1778 dev_err(dev, "PMBus status register not found\n");
1783 /* Enable PEC if the controller supports it */
1784 ret = i2c_smbus_read_byte_data(client, PMBUS_CAPABILITY);
1785 if (ret >= 0 && (ret & PB_CAPABILITY_ERROR_CHECK))
1786 client->flags |= I2C_CLIENT_PEC;
1788 if (data->info->pages)
1789 pmbus_clear_faults(client);
1791 pmbus_clear_fault_page(client, -1);
1793 if (info->identify) {
1794 ret = (*info->identify)(client, info);
1796 dev_err(dev, "Chip identification failed\n");
1801 if (info->pages <= 0 || info->pages > PMBUS_PAGES) {
1802 dev_err(dev, "Bad number of PMBus pages: %d\n", info->pages);
1806 for (page = 0; page < info->pages; page++) {
1807 ret = pmbus_identify_common(client, data, page);
1809 dev_err(dev, "Failed to identify chip capabilities\n");
1816 #if IS_ENABLED(CONFIG_REGULATOR)
1817 static int pmbus_regulator_is_enabled(struct regulator_dev *rdev)
1819 struct device *dev = rdev_get_dev(rdev);
1820 struct i2c_client *client = to_i2c_client(dev->parent);
1821 u8 page = rdev_get_id(rdev);
1824 ret = pmbus_read_byte_data(client, page, PMBUS_OPERATION);
1828 return !!(ret & PB_OPERATION_CONTROL_ON);
1831 static int _pmbus_regulator_on_off(struct regulator_dev *rdev, bool enable)
1833 struct device *dev = rdev_get_dev(rdev);
1834 struct i2c_client *client = to_i2c_client(dev->parent);
1835 u8 page = rdev_get_id(rdev);
1837 return pmbus_update_byte_data(client, page, PMBUS_OPERATION,
1838 PB_OPERATION_CONTROL_ON,
1839 enable ? PB_OPERATION_CONTROL_ON : 0);
1842 static int pmbus_regulator_enable(struct regulator_dev *rdev)
1844 return _pmbus_regulator_on_off(rdev, 1);
1847 static int pmbus_regulator_disable(struct regulator_dev *rdev)
1849 return _pmbus_regulator_on_off(rdev, 0);
1852 const struct regulator_ops pmbus_regulator_ops = {
1853 .enable = pmbus_regulator_enable,
1854 .disable = pmbus_regulator_disable,
1855 .is_enabled = pmbus_regulator_is_enabled,
1857 EXPORT_SYMBOL_GPL(pmbus_regulator_ops);
1859 static int pmbus_regulator_register(struct pmbus_data *data)
1861 struct device *dev = data->dev;
1862 const struct pmbus_driver_info *info = data->info;
1863 const struct pmbus_platform_data *pdata = dev_get_platdata(dev);
1864 struct regulator_dev *rdev;
1867 for (i = 0; i < info->num_regulators; i++) {
1868 struct regulator_config config = { };
1871 config.driver_data = data;
1873 if (pdata && pdata->reg_init_data)
1874 config.init_data = &pdata->reg_init_data[i];
1876 rdev = devm_regulator_register(dev, &info->reg_desc[i],
1879 dev_err(dev, "Failed to register %s regulator\n",
1880 info->reg_desc[i].name);
1881 return PTR_ERR(rdev);
1888 static int pmbus_regulator_register(struct pmbus_data *data)
1894 int pmbus_do_probe(struct i2c_client *client, const struct i2c_device_id *id,
1895 struct pmbus_driver_info *info)
1897 struct device *dev = &client->dev;
1898 const struct pmbus_platform_data *pdata = dev_get_platdata(dev);
1899 struct pmbus_data *data;
1905 if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_WRITE_BYTE
1906 | I2C_FUNC_SMBUS_BYTE_DATA
1907 | I2C_FUNC_SMBUS_WORD_DATA))
1910 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
1914 i2c_set_clientdata(client, data);
1915 mutex_init(&data->update_lock);
1919 data->flags = pdata->flags;
1922 ret = pmbus_init_common(client, data, info);
1926 ret = pmbus_find_attributes(client, data);
1931 * If there are no attributes, something is wrong.
1932 * Bail out instead of trying to register nothing.
1934 if (!data->num_attributes) {
1935 dev_err(dev, "No attributes found\n");
1940 data->groups[0] = &data->group;
1941 data->hwmon_dev = hwmon_device_register_with_groups(dev, client->name,
1942 data, data->groups);
1943 if (IS_ERR(data->hwmon_dev)) {
1944 ret = PTR_ERR(data->hwmon_dev);
1945 dev_err(dev, "Failed to register hwmon device\n");
1949 ret = pmbus_regulator_register(data);
1951 goto out_unregister;
1956 hwmon_device_unregister(data->hwmon_dev);
1958 kfree(data->group.attrs);
1961 EXPORT_SYMBOL_GPL(pmbus_do_probe);
1963 int pmbus_do_remove(struct i2c_client *client)
1965 struct pmbus_data *data = i2c_get_clientdata(client);
1966 hwmon_device_unregister(data->hwmon_dev);
1967 kfree(data->group.attrs);
1970 EXPORT_SYMBOL_GPL(pmbus_do_remove);
1972 MODULE_AUTHOR("Guenter Roeck");
1973 MODULE_DESCRIPTION("PMBus core driver");
1974 MODULE_LICENSE("GPL");