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hwmon: (pmbus/fsp-3y) Fix FSP-3Y YH-5151E non-compliant vout encoding 

I didn't properly test the driver for YH-5151E, so it was completely
broken. Firstly, the log/real mapping was incorrect in one case.
Secondly, PMBus specifies that output voltages should be in the linear16
encoding. However, the YH-5151E is non-compliant and uses linear11.
YM-2151E isn't affected by this. Fix this by converting the values
inside the read functions. linear16 gets the exponent from the VOUT_MODE
command. The device doesn't support it, so I have to manually supply the
value for it.

Both supported devices have now been tested to report correct vout
values.

Fixes: 1734b4135a ("hwmon: Add driver for fsp-3y PSUs and PDUs")
Signed-off-by: Václav Kubernát <kubernat@cesnet.cz>
Link: https://lore.kernel.org/r/20210429075337.110502-1-kubernat@cesnet.cz
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Václav Kubernát 2021-04-29 09:53:38 +02:00 committed by Guenter Roeck
parent 5216dff22d
commit 2d101db3e5
1 changed files with 25 additions and 2 deletions
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27
drivers/hwmon/pmbus/fsp-3y.c
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@ -57,7 +57,7 @@ static int page_log_to_page_real(int page_log, enum chips chip)
case YH5151E_PAGE_12V_LOG:
return YH5151E_PAGE_12V_REAL;
case YH5151E_PAGE_5V_LOG:
return YH5151E_PAGE_5V_LOG;
return YH5151E_PAGE_5V_REAL;
case YH5151E_PAGE_3V3_LOG:
return YH5151E_PAGE_3V3_REAL;
}
@ -103,8 +103,18 @@ static int set_page(struct i2c_client *client, int page_log)
static int fsp3y_read_byte_data(struct i2c_client *client, int page, int reg)
{
const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
struct fsp3y_data *data = to_fsp3y_data(info);
int rv;
/*
* YH5151-E outputs vout in linear11. The conversion is done when
* reading. Here, we have to inject pmbus_core with the correct
* exponent (it is -6).
*/
if (data->chip == yh5151e && reg == PMBUS_VOUT_MODE)
return 0x1A;
rv = set_page(client, page);
if (rv < 0)
return rv;
@ -114,6 +124,8 @@ static int fsp3y_read_byte_data(struct i2c_client *client, int page, int reg)
static int fsp3y_read_word_data(struct i2c_client *client, int page, int phase, int reg)
{
const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
struct fsp3y_data *data = to_fsp3y_data(info);
int rv;
/*
@ -144,7 +156,18 @@ static int fsp3y_read_word_data(struct i2c_client *client, int page, int phase,
if (rv < 0)
return rv;
return i2c_smbus_read_word_data(client, reg);
rv = i2c_smbus_read_word_data(client, reg);
if (rv < 0)
return rv;
/*
* YH-5151E is non-compliant and outputs output voltages in linear11
* instead of linear16.
*/
if (data->chip == yh5151e && reg == PMBUS_READ_VOUT)
rv = sign_extend32(rv, 10) & 0xffff;
return rv;
}
static struct pmbus_driver_info fsp3y_info[] = {