diff options
Diffstat (limited to 'board/hades/pwm.c')
-rw-r--r-- | board/hades/pwm.c | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/board/hades/pwm.c b/board/hades/pwm.c new file mode 100644 index 0000000000..22c01fc6d9 --- /dev/null +++ b/board/hades/pwm.c @@ -0,0 +1,47 @@ +/* Copyright 2023 The ChromiumOS Authors + * Use of this source code is governed by a BSD-style license that can be + * found in the LICENSE file. + */ + +#include "common.h" +#include "compile_time_macros.h" +#include "hooks.h" +#include "pwm.h" +#include "pwm_chip.h" + +const struct pwm_t pwm_channels[] = { + [PWM_CH_KBLIGHT] = { + .channel = 3, + .flags = 0, + /* + * Set PWM frequency to multiple of 50 Hz and 60 Hz to prevent + * flicker. Higher frequencies consume similar average power to + * lower PWM frequencies, but higher frequencies record a much + * lower maximum power. + */ + .freq = 2400, + }, + [PWM_CH_FAN] = { + .channel = 5, + .flags = PWM_CONFIG_OPEN_DRAIN, + .freq = 25000 + }, + [PWM_CH_FAN2] = { + .channel = 4, + .flags = PWM_CONFIG_OPEN_DRAIN, + .freq = 25000 + }, +}; +BUILD_ASSERT(ARRAY_SIZE(pwm_channels) == PWM_CH_COUNT); + +static void board_pwm_init(void) +{ + /* + * Turn off all the LEDs. + * Turn on the fan at 100%. + */ + + pwm_enable(PWM_CH_KBLIGHT, 1); + pwm_set_duty(PWM_CH_KBLIGHT, 50); +} +DECLARE_HOOK(HOOK_INIT, board_pwm_init, HOOK_PRIO_DEFAULT); |