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hwmon: (pmbus) Add support for VR12

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Newer chips such as MAX20751 support VR12. Add support for it.

Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Guenter Roeck 2015-07-20 09:47:33 -07:00
parent ead8080351
commit 068c227056
3 changed files with 15 additions and 4 deletions
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1
drivers/hwmon/pmbus/pmbus.c
View File

@ -129,6 +129,7 @@ static int pmbus_identify(struct i2c_client *client,
break;
case 1:
info->format[PSC_VOLTAGE_OUT] = vid;
info->vrm_version = vr11;
break;
case 2:
info->format[PSC_VOLTAGE_OUT] = direct;

2
drivers/hwmon/pmbus/pmbus.h
View File

@ -338,10 +338,12 @@ enum pmbus_sensor_classes {
#define PMBUS_HAVE_STATUS_VMON (1 << 19)
enum pmbus_data_format { linear = 0, direct, vid };
enum vrm_version { vr11 = 0, vr12 };
struct pmbus_driver_info {
int pages; /* Total number of pages */
enum pmbus_data_format format[PSC_NUM_CLASSES];
enum vrm_version vrm_version;
/*
* Support one set of coefficients for each sensor type
* Used for chips providing data in direct mode.

16
drivers/hwmon/pmbus/pmbus_core.c
View File

@ -515,16 +515,24 @@ static long pmbus_reg2data_direct(struct pmbus_data *data,
/*
* Convert VID sensor values to milli- or micro-units
* depending on sensor type.
* We currently only support VR11.
*/
static long pmbus_reg2data_vid(struct pmbus_data *data,
struct pmbus_sensor *sensor)
{
long val = sensor->data;
long rv = 0;
if (val < 0x02 || val > 0xb2)
return 0;
return DIV_ROUND_CLOSEST(160000 - (val - 2) * 625, 100);
switch (data->info->vrm_version) {
case vr11:
if (val >= 0x02 && val <= 0xb2)
rv = DIV_ROUND_CLOSEST(160000 - (val - 2) * 625, 100);
break;
case vr12:
if (val >= 0x01)
rv = 250 + (val - 1) * 5;
break;
}
return rv;
}
static long pmbus_reg2data(struct pmbus_data *data, struct pmbus_sensor *sensor)