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SubjectRe: [PATCH 13/17] pwm: cros-ec: Remove cros_ec_cmd_xfer_status()
Date

On 30/1/20 21:31, Prashant Malani wrote:
> Convert one existing usage of cros_ec_cmd_xfer_status() to
> cros_ec_send_cmd_msg(), which accomplishes the same thing but also does
> the EC message struct setup,and is defined in platform/chrome and is
> accessible by other modules.
>
> For the other usage, switch it to using cros_ec_cmd_xfer(), since the
> calling functions rely on the result field of the struct cros_ec_command
> struct that is used.
>
> Signed-off-by: Prashant Malani <pmalani@chromium.org>
> ---
> drivers/pwm/pwm-cros-ec.c | 27 +++++++++------------------
> 1 file changed, 9 insertions(+), 18 deletions(-)
>
> diff --git a/drivers/pwm/pwm-cros-ec.c b/drivers/pwm/pwm-cros-ec.c
> index 89497448d21775..8bf610a6529e7e 100644
> --- a/drivers/pwm/pwm-cros-ec.c
> +++ b/drivers/pwm/pwm-cros-ec.c
> @@ -32,25 +32,14 @@ static inline struct cros_ec_pwm_device *pwm_to_cros_ec_pwm(struct pwm_chip *c)
>
> static int cros_ec_pwm_set_duty(struct cros_ec_device *ec, u8 index, u16 duty)
> {
> - struct {
> - struct cros_ec_command msg;
> - struct ec_params_pwm_set_duty params;
> - } __packed buf;
> - struct ec_params_pwm_set_duty *params = &buf.params;
> - struct cros_ec_command *msg = &buf.msg;
> -
> - memset(&buf, 0, sizeof(buf));
> + struct ec_params_pwm_set_duty params = {0};
>
> - msg->version = 0;
> - msg->command = EC_CMD_PWM_SET_DUTY;
> - msg->insize = 0;
> - msg->outsize = sizeof(*params);
> -
> - params->duty = duty;
> - params->pwm_type = EC_PWM_TYPE_GENERIC;
> - params->index = index;
> + params.duty = duty;
> + params.pwm_type = EC_PWM_TYPE_GENERIC;
> + params.index = index;
>
> - return cros_ec_cmd_xfer_status(ec, msg);
> + return cros_ec_send_cmd_msg(ec, 0, EC_CMD_PWM_SET_DUTY, &params,
> + sizeof(params), NULL, 0);
> }
>
> static int __cros_ec_pwm_get_duty(struct cros_ec_device *ec, u8 index,
> @@ -78,11 +67,13 @@ static int __cros_ec_pwm_get_duty(struct cros_ec_device *ec, u8 index,
> params->pwm_type = EC_PWM_TYPE_GENERIC;
> params->index = index;
>
> - ret = cros_ec_cmd_xfer_status(ec, msg);
> + ret = cros_ec_cmd_xfer(ec, msg);

Why? There is a good reason we introduced the cros_ec_cmd_xfer_status.

IMO the purpose of introduce the new wrapper only makes sense if we can cover
_all_ the cases, so we can remove cros_ec_cmd_xfer_status and make
cros_ec_cmd_xfer private to cros_ec_proto.

Is not possible to use the new wrapper here?

> if (result)
> *result = msg->result;

Hmm, I see, that's the problem ...

This driver will need a bit of rework but I think could be possible to use the
wrapper.

> if (ret < 0)
> return ret;
> + else if (msg->result != EC_RES_SUCCESS)
> + return -EPROTO;
>
> return resp->duty;
> }
>

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