linux-kernel - Re: [PATCH v2 10/17] iio: cros_ec: Use cros_ec

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Date:   Thu, 6 Feb 2020 12:17:53 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Prashant Malani <pmalani@...omium.org>
Cc:     linux-kernel@...r.kernel.org, Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Benson Leung <bleung@...omium.org>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Guenter Roeck <groeck@...omium.org>,
        Gwendal Grignou <gwendal@...omium.org>,
        Lee Jones <lee.jones@...aro.org>,
        Fabien Lahoudere <fabien.lahoudere@...labora.com>,
        linux-iio@...r.kernel.org (open list:IIO SUBSYSTEM AND DRIVERS)
Subject: Re: [PATCH v2 10/17] iio: cros_ec: Use cros_ec_cmd()

On Wed,  5 Feb 2020 11:00:13 -0800
Prashant Malani <pmalani@...omium.org> wrote:

> Replace cros_ec_cmd_xfer_status() with cros_ec_cmd()
> which does the message buffer setup and cleanup.
> 
> For one other usage, replace the cros_ec_cmd_xfer_status() call with a
> call to cros_ec_cmd_xfer(), in preparation for the removal of the former
> function.
> 
> Signed-off-by: Prashant Malani <pmalani@...omium.org>

Acked-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>

> ---
> 
> Changes in v2:
> - Updated to use new function name and parameter list.
> - Used C99 element setting to initialize param struct.
> - For second usage, replaced cros_ec_cmd_xfer_status() with
>   cros_ec_cmd_xfer() which is functionally similar.
> 
>  .../cros_ec_sensors/cros_ec_sensors_core.c    | 25 +++++++------------
>  1 file changed, 9 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
> index d3a3626c7cd834..94e22e7d927631 100644
> --- a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
> +++ b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
> @@ -30,24 +30,15 @@ static int cros_ec_get_host_cmd_version_mask(struct cros_ec_device *ec_dev,
>  					     u16 cmd_offset, u16 cmd, u32 *mask)
>  {
>  	int ret;
> -	struct {
> -		struct cros_ec_command msg;
> -		union {
> -			struct ec_params_get_cmd_versions params;
> -			struct ec_response_get_cmd_versions resp;
> -		};
> -	} __packed buf = {
> -		.msg = {
> -			.command = EC_CMD_GET_CMD_VERSIONS + cmd_offset,
> -			.insize = sizeof(struct ec_response_get_cmd_versions),
> -			.outsize = sizeof(struct ec_params_get_cmd_versions)
> -			},
> -		.params = {.cmd = cmd}
> +	struct ec_params_get_cmd_versions params = {
> +		.cmd = cmd,
>  	};
> +	struct ec_response_get_cmd_versions resp = {0};
>  
> -	ret = cros_ec_cmd_xfer_status(ec_dev, &buf.msg);
> +	ret = cros_ec_cmd(ec_dev, 0, EC_CMD_GET_CMD_VERSIONS + cmd_offset,
> +			  &params, sizeof(params), &resp, sizeof(resp), NULL);
>  	if (ret >= 0)
> -		*mask = buf.resp.version_mask;
> +		*mask = resp.version_mask;
>  	return ret;
>  }
>  
> @@ -171,9 +162,11 @@ int cros_ec_motion_send_host_cmd(struct cros_ec_sensors_core_state *state,
>  
>  	memcpy(state->msg->data, &state->param, sizeof(state->param));
>  
> -	ret = cros_ec_cmd_xfer_status(state->ec, state->msg);
> +	ret = cros_ec_cmd_xfer(state->ec, state->msg);
>  	if (ret < 0)
>  		return ret;
> +	else if (state->msg->result != EC_RES_SUCCESS)
> +		return -EPROTO;
>  
>  	if (ret &&
>  	    state->resp != (struct ec_response_motion_sense *)state->msg->data)