diff options
Diffstat (limited to 'board/blaze/led.c')
-rw-r--r-- | board/blaze/led.c | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/board/blaze/led.c b/board/blaze/led.c new file mode 100644 index 0000000000..5c3adacb17 --- /dev/null +++ b/board/blaze/led.c @@ -0,0 +1,193 @@ +/* Copyright (c) 2014 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 Blaze + */ + +#include "charge_state.h" +#include "chipset.h" +#include "extpower.h" +#include "gpio.h" +#include "hooks.h" +#include "led_common.h" +#include "util.h" +#include "battery.h" + +const enum ec_led_id supported_led_ids[] = { + EC_LED_ID_BATTERY_LED, EC_LED_ID_POWER_LED}; +const int supported_led_ids_count = ARRAY_SIZE(supported_led_ids); + +enum led_color { + LED_OFF = 0, + LED_WHITE, + LED_AMBER, + LED_COLOR_COUNT /* Number of colors, not a color itself */ +}; + +static int bat_led_set_color(enum led_color color) +{ + switch (color) { + case LED_OFF: + gpio_set_level(GPIO_AC_LED, 0); + gpio_set_level(GPIO_CHG_LED, 0); + break; + case LED_WHITE: + gpio_set_level(GPIO_AC_LED, 1); + gpio_set_level(GPIO_CHG_LED, 0); + break; + case LED_AMBER: + gpio_set_level(GPIO_AC_LED, 0); + gpio_set_level(GPIO_CHG_LED, 1); + break; + default: + return EC_ERROR_UNKNOWN; + } + return EC_SUCCESS; +} + +static int pwr_led_set_color(enum led_color color) +{ + switch (color) { + case LED_OFF: + gpio_set_level(GPIO_LED_POWER_L, 1); + break; + case LED_WHITE: + gpio_set_level(GPIO_LED_POWER_L, 0); + break; + default: + return EC_ERROR_UNKNOWN; + } + return EC_SUCCESS; +} + +void led_get_brightness_range(enum ec_led_id led_id, uint8_t *brightness_range) +{ + switch (led_id) { + case EC_LED_ID_BATTERY_LED: + brightness_range[EC_LED_COLOR_WHITE] = 100; + brightness_range[EC_LED_COLOR_YELLOW] = 100; + break; + case EC_LED_ID_POWER_LED: + brightness_range[EC_LED_COLOR_WHITE] = 100; + break; + default: + /* Nothing to do */ + break; + } +} + +int led_set_brightness(enum ec_led_id led_id, const uint8_t *brightness) +{ + switch (led_id) { + case EC_LED_ID_BATTERY_LED: + if (brightness[EC_LED_COLOR_WHITE] != 0) + bat_led_set_color(LED_WHITE); + else if (brightness[EC_LED_COLOR_YELLOW] != 0) + bat_led_set_color(LED_AMBER); + else + bat_led_set_color(LED_OFF); + break; + case EC_LED_ID_POWER_LED: + if (brightness[EC_LED_COLOR_WHITE] != 0) + pwr_led_set_color(LED_WHITE); + else + pwr_led_set_color(LED_OFF); + break; + default: + break; + } + return EC_SUCCESS; +} + +static void blaze_led_set_power(void) +{ + static int power_ticks; + static int previous_state_suspend; + + power_ticks++; + + /* Solid On: when the computer is ON (S0) & the LED color is White. + * Blinking: when the computer is in Standby, sequence of 1 second ON, + * 1 second OFF, The LED color is white. */ + + if (chipset_in_state(CHIPSET_STATE_SUSPEND)) { + /* Reset ticks if entering suspend so LED turns off + * as soon as possible. */ + if (!previous_state_suspend) + power_ticks = 0; + + pwr_led_set_color((power_ticks & 0x2) ? LED_WHITE : LED_OFF); + + previous_state_suspend = 1; + return; + } + + previous_state_suspend = 0; + + if (chipset_in_state(CHIPSET_STATE_ON)) + pwr_led_set_color(LED_WHITE); + else + pwr_led_set_color(LED_OFF); +} + +static void blaze_led_set_battery(void) +{ + static int battery_ticks; + uint32_t chflags = charge_get_flags(); + + battery_ticks++; + + /* Solid ON White: means AC adapter is attached to system + * and battery is full. + * Solid ON Amber: means a battery is charging. + * Blinking white slowly: The fuel gauge is less than 12%. + * Sequence of Blink is 1 second On, + * 1 second Off. + * Blinking white quickly: When the primary or secondary battery is not + * communicating with EC, EC will blink the + * white LED at the sequence 0.5 second On + * and 0.5 second Off. */ + + /* Battery LED is solid white if AC connected, unless the battery is + * is charging or there is an error. + * Battery LED should be off if AC not present*/ + bat_led_set_color(extpower_is_present() ? LED_WHITE : LED_OFF); + + switch (charge_get_state()) { + case PWR_STATE_CHARGE: + bat_led_set_color(LED_AMBER); + break; + case PWR_STATE_DISCHARGE: + /* See crosbug.com/p/22159. There's a 3% difference + * between the battery level seen by the kernel and what's + * really going on, so if they want to see 12%, we use 15%. + * Hard code this number here, because this only affects the + * LED color, not the battery charge state. */ + if (charge_get_percent() < 15) + bat_led_set_color( + (battery_ticks & 0x2) ? LED_WHITE : LED_OFF); + break; + case PWR_STATE_ERROR: + bat_led_set_color((battery_ticks & 0x1) ? LED_WHITE : LED_OFF); + break; + case PWR_STATE_IDLE: + if (chflags & CHARGE_FLAG_FORCE_IDLE) + bat_led_set_color( + (battery_ticks & 0x2) ? LED_AMBER : LED_OFF); + break; + default: + /* Other states don't alter LED behavior */ + break; + } +} + +/* Called by hook task every 500mSec */ +static void led_tick(void) +{ + if (led_auto_control_is_enabled(EC_LED_ID_POWER_LED)) + blaze_led_set_power(); + if (led_auto_control_is_enabled(EC_LED_ID_BATTERY_LED)) + blaze_led_set_battery(); +} +DECLARE_HOOK(HOOK_TICK, led_tick, HOOK_PRIO_DEFAULT); |