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Commit 2b66bd69 authored by Brian Norris's avatar Brian Norris Committed by Thierry Reding
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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: default avatarBrian Norris <briannorris@chromium.org>
Acked-by: default avatarLee Jones <lee.jones@linaro.org>
Signed-off-by: default avatarThierry Reding <thierry.reding@gmail.com>
parent 9798ac6d

include/linux/mfd/cros_ec_commands.h

+31 −0
Original line number Diff line number Diff line
@@ -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