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hwmon: (pmbus) Improve support for paged fans

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So far, it seemed like fans would either all be in page 0, or that
there would be one page per fan.

Turns out this was a wrong assumption. There is at least one PMBus
fan controller which supports three pages with four fans each.
Update code to handle this situation.

Reported-by: Greg Schnorr <gschnorr@cisco.com>
Tested-by: Greg Schnorr <gschnorr@cisco.com>
Signed-off-by: Guenter Roeck <guenter.roeck@ericsson.com>
Acked-by: Greg Schnorr <gschnorr@cisco.com>
This commit is contained in:
Guenter Roeck 2011-03-05 07:55:10 -08:00
parent 83274c68a3
commit 954df6763c
1 changed files with 40 additions and 30 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

70
drivers/hwmon/pmbus_core.c
View file

@ -58,12 +58,10 @@
#define PMBUS_MAX_INPUT_LABELS 4 /* vin, vcap, iin, pin */
/*
* status, status_vout, status_iout, status_fans, and status_temp
* are paged. status_input and status_fan34 are unpaged.
* status_fan34 is a special case to handle a second set of fans
* on page 0.
* status, status_vout, status_iout, status_fans, status_fan34, and status_temp
* are paged. status_input is unpaged.
*/
#define PB_NUM_STATUS_REG (PMBUS_PAGES * 5 + 2)
#define PB_NUM_STATUS_REG (PMBUS_PAGES * 6 + 1)
/*
* Index into status register array, per status register group
@ -73,7 +71,7 @@
#define PB_STATUS_IOUT_BASE (PB_STATUS_VOUT_BASE + PMBUS_PAGES)
#define PB_STATUS_FAN_BASE (PB_STATUS_IOUT_BASE + PMBUS_PAGES)
#define PB_STATUS_FAN34_BASE (PB_STATUS_FAN_BASE + PMBUS_PAGES)
#define PB_STATUS_INPUT_BASE (PB_STATUS_FAN34_BASE + 1)
#define PB_STATUS_INPUT_BASE (PB_STATUS_FAN34_BASE + PMBUS_PAGES)
#define PB_STATUS_TEMP_BASE (PB_STATUS_INPUT_BASE + 1)
struct pmbus_sensor {
@ -327,14 +325,17 @@ static struct pmbus_data *pmbus_update_device(struct device *dev)
= pmbus_get_status(client, i, PMBUS_STATUS_FAN_12);
}
for (i = 0; i < info->pages; i++) {
if (!(info->func[i] & PMBUS_HAVE_STATUS_FAN34))
continue;
data->status[PB_STATUS_FAN34_BASE + i]
= pmbus_get_status(client, i, PMBUS_STATUS_FAN_34);
}
if (info->func[0] & PMBUS_HAVE_STATUS_INPUT)
data->status[PB_STATUS_INPUT_BASE]
= pmbus_get_status(client, 0, PMBUS_STATUS_INPUT);
if (info->func[0] & PMBUS_HAVE_STATUS_FAN34)
data->status[PB_STATUS_FAN34_BASE]
= pmbus_get_status(client, 0, PMBUS_STATUS_FAN_34);
for (i = 0; i < data->num_sensors; i++) {
struct pmbus_sensor *sensor = &data->sensors[i];
@ -817,6 +818,20 @@ static const int pmbus_fan_status_registers[] = {
PMBUS_STATUS_FAN_34
};
static const u32 pmbus_fan_flags[] = {
PMBUS_HAVE_FAN12,
PMBUS_HAVE_FAN12,
PMBUS_HAVE_FAN34,
PMBUS_HAVE_FAN34
};
static const u32 pmbus_fan_status_flags[] = {
PMBUS_HAVE_STATUS_FAN12,
PMBUS_HAVE_STATUS_FAN12,
PMBUS_HAVE_STATUS_FAN34,
PMBUS_HAVE_STATUS_FAN34
};
/*
* Determine maximum number of sensors, booleans, and labels.
* To keep things simple, only make a rough high estimate.
@ -848,17 +863,12 @@ static void pmbus_find_max_attr(struct i2c_client *client,
max_labels++;
}
if (info->func[page] & PMBUS_HAVE_FAN12) {
if (page == 0) {
max_sensors +=
ARRAY_SIZE(pmbus_fan_registers) *
PMBUS_MAX_SENSORS_PER_FAN;
max_booleans +=
ARRAY_SIZE(pmbus_fan_registers) *
PMBUS_MAX_BOOLEANS_PER_FAN;
} else {
max_sensors += PMBUS_MAX_SENSORS_PER_FAN;
max_booleans += PMBUS_MAX_BOOLEANS_PER_FAN;
}
max_sensors += 2 * PMBUS_MAX_SENSORS_PER_FAN;
max_booleans += 2 * PMBUS_MAX_BOOLEANS_PER_FAN;
}
if (info->func[page] & PMBUS_HAVE_FAN34) {
max_sensors += 2 * PMBUS_MAX_SENSORS_PER_FAN;
max_booleans += 2 * PMBUS_MAX_BOOLEANS_PER_FAN;
}
if (info->func[page] & PMBUS_HAVE_TEMP) {
if (page == 0) {
@ -1365,15 +1375,14 @@ static void pmbus_find_attributes(struct i2c_client *client,
*/
in_index = 1;
for (page = 0; page < info->pages; page++) {
int fans, f;
int f;
if (!(info->func[page] & PMBUS_HAVE_FAN12))
continue;
fans = page ? 1 : ARRAY_SIZE(pmbus_fan_registers);
for (f = 0; f < fans; f++) {
for (f = 0; f < ARRAY_SIZE(pmbus_fan_registers); f++) {
int regval;
if (!(info->func[page] & pmbus_fan_flags[f]))
break;
if (!pmbus_check_word_register(client, page,
pmbus_fan_registers[f])
|| !pmbus_check_byte_register(client, page,
@ -1399,12 +1408,13 @@ static void pmbus_find_attributes(struct i2c_client *client,
* Each fan status register covers multiple fans,
* so we have to do some magic.
*/
if (pmbus_check_byte_register
(client, page, pmbus_fan_status_registers[f])) {
if ((info->func[page] & pmbus_fan_status_flags[f]) &&
pmbus_check_byte_register(client,
page, pmbus_fan_status_registers[f])) {
int base;
if (f > 1) /* fan 3, 4 */
base = PB_STATUS_FAN34_BASE;
base = PB_STATUS_FAN34_BASE + page;
else
base = PB_STATUS_FAN_BASE + page;
pmbus_add_boolean_reg(data, "fan", "alarm",