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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: Brian Norris <briannorris@chromium.org>
Acked-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
This commit is contained in:
Brian Norris 2016-07-15 16:28:42 -07:00 committed by Thierry Reding
parent 9798ac6d32
commit 2b66bd692c
1 changed files with 31 additions and 0 deletions
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31
include/linux/mfd/cros_ec_commands.h
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@ -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