linux-kernel - Re: [PATCH 1/3] mfd: cros_ec: Add EC console read structures definitions

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Date:   Tue, 23 Aug 2016 14:15:14 -0700
From:   Guenter Roeck <groeck@...gle.com>
To:     Nicolas Boichat <drinkcat@...omium.org>
Cc:     Lee Jones <lee.jones@...aro.org>,
        Gwendal Grignou <gwendal@...omium.org>, ejcaruso@...omium.org,
        Olof Johansson <olof@...om.net>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Guenter Roeck <groeck@...omium.org>
Subject: Re: [PATCH 1/3] mfd: cros_ec: Add EC console read structures definitions

On Mon, Aug 22, 2016 at 9:34 PM, Nicolas Boichat <drinkcat@...omium.org> wrote:
> ec_params_console_read_v1 is used to capture EC logs from kernel,
> and ec_params_get_cmd_versions_v1 is used to probe whether EC
> supports that command.
>
> Signed-off-by: Nicolas Boichat <drinkcat@...omium.org>

Reviewed-by: Guenter Roeck <groeck@...omium.org>

> ---
>  include/linux/mfd/cros_ec_commands.h | 21 ++++++++++++++++++++-
>  1 file changed, 20 insertions(+), 1 deletion(-)
>
> diff --git a/include/linux/mfd/cros_ec_commands.h b/include/linux/mfd/cros_ec_commands.h
> index 7e7a8d4..74c84e82 100644
> --- a/include/linux/mfd/cros_ec_commands.h
> +++ b/include/linux/mfd/cros_ec_commands.h
> @@ -625,6 +625,10 @@ struct ec_params_get_cmd_versions {
>         uint8_t cmd;      /* Command to check */
>  } __packed;
>
> +struct ec_params_get_cmd_versions_v1 {
> +       uint16_t cmd;     /* Command to check */
> +} __packed;
> +
>  struct ec_response_get_cmd_versions {
>         /*
>          * Mask of supported versions; use EC_VER_MASK() to compare with a
> @@ -2003,13 +2007,28 @@ struct ec_params_charge_control {
>  #define EC_CMD_CONSOLE_SNAPSHOT 0x97
>
>  /*
> - * Read next chunk of data from saved snapshot.
> + * Read data from the saved snapshot. If the subcmd parameter is
> + * CONSOLE_READ_NEXT, this will return data starting from the beginning of
> + * the latest snapshot. If it is CONSOLE_READ_RECENT, it will start from the
> + * end of the previous snapshot.
> + *
> + * The params are only looked at in version >= 1 of this command. Prior
> + * versions will just default to CONSOLE_READ_NEXT behavior.
>   *
>   * Response is null-terminated string.  Empty string, if there is no more
>   * remaining output.
>   */
>  #define EC_CMD_CONSOLE_READ 0x98
>
> +enum ec_console_read_subcmd {
> +       CONSOLE_READ_NEXT = 0,
> +       CONSOLE_READ_RECENT
> +};
> +
> +struct ec_params_console_read_v1 {
> +       uint8_t subcmd; /* enum ec_console_read_subcmd */
> +} __packed;
> +
>  /*****************************************************************************/
>
>  /*
> --
> 2.8.0.rc3.226.g39d4020
>