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Diffstat (limited to 'board/ninja/led.c')
-rw-r--r-- | board/ninja/led.c | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/board/ninja/led.c b/board/ninja/led.c new file mode 100644 index 0000000000..ddea38fc5a --- /dev/null +++ b/board/ninja/led.c @@ -0,0 +1,121 @@ +/* Copyright (c) 2015 The Chromium OS Authors. All rights reserved. + * Use of this source code is governed by a BSD-style license that can be + * found in the LICENSE file. + * + * Battery LED control for Ninja + */ + +#include "charge_state.h" +#include "chipset.h" +#include "gpio.h" +#include "hooks.h" +#include "led_common.h" +#include "pwm.h" +#include "util.h" + +const enum ec_led_id supported_led_ids[] = {EC_LED_ID_BATTERY_LED}; +const int supported_led_ids_count = ARRAY_SIZE(supported_led_ids); + +enum led_color { + LED_OFF = 0, + LED_RED, + LED_ORANGE, + LED_YELLOW, + LED_GREEN, + + /* Number of colors, not a color itself */ + LED_COLOR_COUNT +}; + +/* Brightness vs. color, for {red, green} LEDs */ +static const uint8_t color_brightness[LED_COLOR_COUNT][2] = { + {0, 0}, + {100, 0}, + {30, 45}, + {20, 60}, + {0, 100}, +}; + +/** + * Set LED color + * + * @param color Enumerated color value + */ +static void set_color(enum led_color color) +{ + pwm_set_duty(PWM_CH_LED_RED, color_brightness[color][0]); + pwm_set_duty(PWM_CH_LED_GREEN, color_brightness[color][1]); +} + +void led_get_brightness_range(enum ec_led_id led_id, uint8_t *brightness_range) +{ + brightness_range[EC_LED_COLOR_RED] = 100; + brightness_range[EC_LED_COLOR_GREEN] = 100; +} + +int led_set_brightness(enum ec_led_id led_id, const uint8_t *brightness) +{ + pwm_set_duty(PWM_CH_LED_RED, brightness[EC_LED_COLOR_RED]); + pwm_set_duty(PWM_CH_LED_GREEN, brightness[EC_LED_COLOR_GREEN]); + return EC_SUCCESS; +} + +static void led_init(void) +{ + /* Configure GPIOs */ + gpio_config_module(MODULE_PWM_LED, 1); + + /* + * Enable PWMs and set to 0% duty cycle. If they're disabled, the LM4 + * seems to ground the pins instead of letting them float. + */ + pwm_enable(PWM_CH_LED_RED, 1); + pwm_enable(PWM_CH_LED_GREEN, 1); + set_color(LED_OFF); +} +DECLARE_HOOK(HOOK_INIT, led_init, HOOK_PRIO_DEFAULT); + +/** + * Called by hook task every 250 ms + */ +static void led_tick(void) +{ + static unsigned ticks; + int chstate = charge_get_state(); + + ticks++; + + /* If we don't control the LED, nothing to do */ + if (!led_auto_control_is_enabled(EC_LED_ID_BATTERY_LED)) + return; + + /* If charging error, blink orange, 25% duty cycle, 4 sec period */ + if (chstate == PWR_STATE_ERROR) { + set_color((ticks % 16) < 4 ? LED_ORANGE : LED_OFF); + return; + } + + /* If charge-force-idle, blink green, 50% duty cycle, 2 sec period */ + if (chstate == PWR_STATE_IDLE && + (charge_get_flags() & CHARGE_FLAG_FORCE_IDLE)) { + set_color((ticks & 0x4) ? LED_GREEN : LED_OFF); + return; + } + + /* If the system is charging, solid orange */ + if (chstate == PWR_STATE_CHARGE) { + set_color(LED_ORANGE); + return; + } + + /* If AC connected and fully charged (or close to it), solid green */ + if (chstate == PWR_STATE_CHARGE_NEAR_FULL || + chstate == PWR_STATE_IDLE) { + set_color(LED_GREEN); + return; + } + + /* Otherwise, system is off and AC not connected, LED off */ + set_color(LED_OFF); +} +DECLARE_HOOK(HOOK_TICK, led_tick, HOOK_PRIO_DEFAULT); |