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mfd: cros_ec: Add I2C passthru protection API

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Prevent direct i2c access to device behind EC when not in development mode.

Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
Acked-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Acked-by: Benson Leung <bleung@chromium.org>
Reviewed-by: Fabien Lahoudere <fabien.lahoudere@collabora.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Gwendal Grignou 2019-06-03 11:33:54 -07:00 • committed by Lee Jones
parent 77c48c76ad
commit a47bc8a4e8
1 changed files with 22 additions and 0 deletions

22
include/linux/mfd/cros_ec_commands.h
View file

@ -4316,6 +4316,28 @@ struct ec_params_entering_mode {
#define VBOOT_MODE_DEVELOPER 1 #define VBOOT_MODE_DEVELOPER 1
#define VBOOT_MODE_RECOVERY 2 #define VBOOT_MODE_RECOVERY 2
/*****************************************************************************/
/*
* I2C passthru protection command: Protects I2C tunnels against access on
* certain addresses (board-specific).
*/
#define EC_CMD_I2C_PASSTHRU_PROTECT 0x00B7
enum ec_i2c_passthru_protect_subcmd {
EC_CMD_I2C_PASSTHRU_PROTECT_STATUS = 0x0,
EC_CMD_I2C_PASSTHRU_PROTECT_ENABLE = 0x1,
};
struct ec_params_i2c_passthru_protect {
uint8_t subcmd;
uint8_t port; /* I2C port number */
} __ec_align1;
struct ec_response_i2c_passthru_protect {
uint8_t status; /* Status flags (0: unlocked, 1: locked) */
} __ec_align1;
/*****************************************************************************/ /*****************************************************************************/
/* /*
* HDMI CEC commands * HDMI CEC commands