diff options
Diffstat (limited to 'driver/led/ds2413.c')
-rw-r--r-- | driver/led/ds2413.c | 166 |
1 files changed, 0 insertions, 166 deletions
diff --git a/driver/led/ds2413.c b/driver/led/ds2413.c deleted file mode 100644 index b856d85671..0000000000 --- a/driver/led/ds2413.c +++ /dev/null @@ -1,166 +0,0 @@ -/* Copyright 2013 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. - */ - -/* Power LED control for Chrome EC */ - -#include "charge_state.h" -#include "console.h" -#include "hooks.h" -#include "onewire.h" -#include "timer.h" -#include "util.h" - -#define ONEWIRE_RETRIES 10 - -enum led_color { - LED_OFF = 0, - LED_RED, - LED_YELLOW, - LED_GREEN, - LED_COLOR_COUNT /* Number of colors, not a color itself */ -}; - -static const uint8_t led_masks[LED_COLOR_COUNT] = {0xff, 0xfe, 0xfc, 0xfd}; -static const char * const color_names[LED_COLOR_COUNT] = { - "off", "red", "yellow", "green"}; - -/** - * Set the onewire LED GPIO controller outputs - * - * @param mask Mask of outputs to enable - * - * @return EC_SUCCESS, or non-zero if error. - */ -static int led_set_mask(int mask) -{ - int rv; - - /* Reset the 1-wire bus */ - rv = onewire_reset(); - if (rv) - return rv; - - /* Skip ROM, since only one device */ - onewire_write(0xcc); - - /* Write and turn on the LEDs */ - onewire_write(0x5a); - onewire_write(mask); - onewire_write(~mask); /* Repeat inverted */ - - rv = onewire_read(); /* Confirmation byte */ - if (rv != 0xaa) - return EC_ERROR_UNKNOWN; - - /* The next byte is a read-back of the chip status. Since we're only - * using lines as outputs, we can ignore it. */ - return EC_SUCCESS; -} - -static int led_set(enum led_color color) -{ - int rv = EC_SUCCESS; - int i; - - /* - * 1-wire communication can fail for timing reasons in the current - * system. We have a limited timing window to send/receive bits, but - * we can't disable interrupts for the rest of the system to guarantee - * we hit that window. Instead, simply retry the low-level command a - * few times. - */ - for (i = 0; i < ONEWIRE_RETRIES; i++) { - rv = led_set_mask(led_masks[color]); - if (rv == EC_SUCCESS) - break; - - /* - * Sleep for a bit between tries. This gives the 1-wire GPIO - * chip time to recover from the failed attempt, and allows - * lower-priority tasks a chance to run. - */ - usleep(100); - } - - return rv; -} - -/*****************************************************************************/ -/* Hooks */ - -static void onewire_led_tick(void) -{ - static enum led_color current_color = LED_COLOR_COUNT; - static int tick_count; - - enum led_color new_color = LED_OFF; - uint32_t chflags = charge_get_flags(); - - tick_count++; - - if (!(chflags & CHARGE_FLAG_EXTERNAL_POWER)) { - /* AC isn't present, so the power LED on the AC plug is off */ - current_color = LED_OFF; - return; - } - - /* Translate charge state to LED color */ - switch (charge_get_state()) { - case PWR_STATE_IDLE: - if (chflags & CHARGE_FLAG_FORCE_IDLE) - new_color = (tick_count & 1) ? LED_GREEN : LED_OFF; - else - new_color = LED_GREEN; - break; - case PWR_STATE_CHARGE: - new_color = LED_YELLOW; - break; - case PWR_STATE_CHARGE_NEAR_FULL: - new_color = LED_GREEN; - break; - case PWR_STATE_ERROR: - new_color = LED_RED; - break; - default: - /* Other states don't change LED color */ - break; - } - - /* - * The power adapter on link can partially unplug and lose its LED - * state. There's no way to detect this, so just assume it forgets its - * state every 10 seconds. - */ - if (!(tick_count % 10)) - current_color = LED_COLOR_COUNT; - - /* If current color is still correct, leave now */ - if (new_color == current_color) - return; - - /* Update LED */ - if (!led_set(new_color)) - current_color = new_color; -} -DECLARE_HOOK(HOOK_SECOND, onewire_led_tick, HOOK_PRIO_DEFAULT); - -/*****************************************************************************/ -/* Console commands */ -#define CONFIG_CMD_POWERLED -static int command_powerled(int argc, char **argv) -{ - int i; - - /* Pick a color, any color... */ - for (i = 0; i < LED_COLOR_COUNT; i++) { - if (!strcasecmp(argv[1], color_names[i])) - return led_set(i); - } - return EC_ERROR_PARAM1; -} -DECLARE_CONSOLE_COMMAND(powerled, command_powerled, - "<off | red | yellow | green>", - "Set power LED color"); -#endif |