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hwmon: (mlxreg-fan) Modify PWM connectivity validation

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Validate PWM connectivity only for additional PWM - "pwm1" is connected
on all systems, while "pwm2" - "pwm4" are optional. Validate
connectivity only for optional attributes by reading of related "pwm{n}"
registers - in case "pwm{n}" is not connected, register value is
supposed to be 0xff.

Signed-off-by: Vadim Pasternak <vadimp@nvidia.com>
Link: https://lore.kernel.org/r/20210926053541.1806937-2-vadimp@nvidia.com
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Vadim Pasternak 2021-09-26 08:35:40 +03:00 committed by Guenter Roeck
parent 1508fb2915
commit b1c2423734
1 changed files with 8 additions and 3 deletions
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11
drivers/hwmon/mlxreg-fan.c
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@ -488,9 +488,14 @@ static int mlxreg_fan_config(struct mlxreg_fan *fan,
return -EINVAL;
}
err = mlxreg_pwm_connect_verify(fan, data);
if (err)
return err;
/* Validate if more then one PWM is connected. */
if (pwm_num) {
err = mlxreg_pwm_connect_verify(fan, data);
if (err < 0)
return err;
else if (!err)
continue;
}
fan->pwm[pwm_num].reg = data->reg;
fan->pwm[pwm_num].connected = true;