From 2b66bd692c40034d42d905f37f7f20c3540f185e Mon Sep 17 00:00:00 2001 From: Brian Norris Date: Fri, 15 Jul 2016 16:28:42 -0700 Subject: [PATCH] mfd: cros_ec: Add EC_PWM function definitions The EC_CMD_PWM_{GET,SET}_DUTY commands allow us to control a PWM that is attached to the EC, rather than the main host SoC. The API provides functionality-based (e.g., keyboard light, backlight) or index-based addressing of the PWM(s). Duty cycles are represented by a 16-bit value, where 0 maps to 0% duty cycle and U16_MAX maps to 100%. The period cannot be controlled. This command set is more generic than, e.g., EC_CMD_PWM_{GET,SET}_KEYBOARD_BACKLIGHT and could possibly used to replace it on future products. Let's update the command header to include the definitions. Signed-off-by: Brian Norris Acked-by: Lee Jones Signed-off-by: Thierry Reding --- include/linux/mfd/cros_ec_commands.h | 31 ++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) diff --git a/include/linux/mfd/cros_ec_commands.h b/include/linux/mfd/cros_ec_commands.h index 13b630c10d4c..7e7a8d4b4551 100644 --- a/include/linux/mfd/cros_ec_commands.h +++ b/include/linux/mfd/cros_ec_commands.h @@ -949,6 +949,37 @@ struct ec_params_pwm_set_fan_duty { uint32_t percent; } __packed; +#define EC_CMD_PWM_SET_DUTY 0x25 +/* 16 bit duty cycle, 0xffff = 100% */ +#define EC_PWM_MAX_DUTY 0xffff + +enum ec_pwm_type { + /* All types, indexed by board-specific enum pwm_channel */ + EC_PWM_TYPE_GENERIC = 0, + /* Keyboard backlight */ + EC_PWM_TYPE_KB_LIGHT, + /* Display backlight */ + EC_PWM_TYPE_DISPLAY_LIGHT, + EC_PWM_TYPE_COUNT, +}; + +struct ec_params_pwm_set_duty { + uint16_t duty; /* Duty cycle, EC_PWM_MAX_DUTY = 100% */ + uint8_t pwm_type; /* ec_pwm_type */ + uint8_t index; /* Type-specific index, or 0 if unique */ +} __packed; + +#define EC_CMD_PWM_GET_DUTY 0x26 + +struct ec_params_pwm_get_duty { + uint8_t pwm_type; /* ec_pwm_type */ + uint8_t index; /* Type-specific index, or 0 if unique */ +} __packed; + +struct ec_response_pwm_get_duty { + uint16_t duty; /* Duty cycle, EC_PWM_MAX_DUTY = 100% */ +} __packed; + /*****************************************************************************/ /* * Lightbar commands. This looks worse than it is. Since we only use one HOST -- 2.20.1