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pwm: cros-ec: Simplify EC error handling

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With enhanced error reporting from cros_ec_cmd_xfer_status() in place,
we can fully use it and no longer rely on EC error codes.

Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Reviewed-by: Brian Norris <briannorris@chromium.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
This commit is contained in:
Guenter Roeck 2020-08-22 08:08:57 -07:00 committed by Enric Balletbo i Serra
parent 0d080459e8
commit be020f0df5
1 changed files with 4 additions and 22 deletions
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26
drivers/pwm/pwm-cros-ec.c
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@ -81,8 +81,7 @@ static int cros_ec_pwm_set_duty(struct cros_ec_device *ec, u8 index, u16 duty)
return cros_ec_cmd_xfer_status(ec, msg);
}
static int __cros_ec_pwm_get_duty(struct cros_ec_device *ec, u8 index,
u32 *result)
static int cros_ec_pwm_get_duty(struct cros_ec_device *ec, u8 index)
{
struct {
struct cros_ec_command msg;
@ -107,19 +106,12 @@ static int __cros_ec_pwm_get_duty(struct cros_ec_device *ec, u8 index,
params->index = index;
ret = cros_ec_cmd_xfer_status(ec, msg);
if (result)
*result = msg->result;
if (ret < 0)
return ret;
return resp->duty;
}
static int cros_ec_pwm_get_duty(struct cros_ec_device *ec, u8 index)
{
return __cros_ec_pwm_get_duty(ec, index, NULL);
}
static int cros_ec_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm,
const struct pwm_state *state)
{
@ -215,28 +207,18 @@ static int cros_ec_num_pwms(struct cros_ec_device *ec)
/* The index field is only 8 bits */
for (i = 0; i <= U8_MAX; i++) {
u32 result = 0;
ret = __cros_ec_pwm_get_duty(ec, i, &result);
ret = cros_ec_pwm_get_duty(ec, i);
/*
* We look for SUCCESS, INVALID_COMMAND, or INVALID_PARAM
* responses; everything else is treated as an error.
* The EC error codes either map to -EOPNOTSUPP / -EINVAL,
* or -EPROTO is returned and the EC error is in the result
* field. Check for both.
* The EC error codes map to -EOPNOTSUPP and -EINVAL,
* so check for those.
*/
switch (ret) {
case -EOPNOTSUPP: /* invalid command */
return -ENODEV;
case -EINVAL: /* invalid parameter */
return i;
case -EPROTO:
/* Old or new error return code: Handle both */
if (result == EC_RES_INVALID_COMMAND)
return -ENODEV;
else if (result == EC_RES_INVALID_PARAM)
return i;
return -EPROTO;
default:
if (ret < 0)
return ret;