diff options
| author | Vic Yang <victoryang@chromium.org> | 2013-02-06 01:44:06 +0800 |
|---|---|---|
| committer | ChromeBot <chrome-bot@google.com> | 2013-02-05 21:20:06 -0800 |
| commit | e955c627920edc591b2473470fa5de06c3f62e31 (patch) | |
| tree | 133638116ad5934feb8d43bc6eb871826c44946d | |
| parent | 57d9c35198edb600cbf4af460b4961122fce943b (diff) | |
| download | chrome-ec-e955c627920edc591b2473470fa5de06c3f62e31.tar.gz | |
spring: Limit USB port current
BUG=chrome-os-partner:14319
TEST=Attach different chargers and see corresponding PWM duty cycle set.
BRANCH=none
Change-Id: I10c6e28ddf5a959849a6f14d9ca3894be4f16e30
Signed-off-by: Vic Yang <victoryang@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/42691
| -rw-r--r-- | board/spring/usb_charging.c | 26 |
1 files changed, 24 insertions, 2 deletions
diff --git a/board/spring/usb_charging.c b/board/spring/usb_charging.c index 66b6ad667c..b919ec851b 100644 --- a/board/spring/usb_charging.c +++ b/board/spring/usb_charging.c @@ -25,6 +25,13 @@ #define POWERED_DEVICE_TYPE (TSU6721_TYPE_OTG | \ TSU6721_TYPE_JIG_UART_ON) +/* PWM controlled current limit */ +#define I_LIMIT_500MA 85 +#define I_LIMIT_1000MA 70 +#define I_LIMIT_1500MA 50 +#define I_LIMIT_2000MA 35 +#define I_LIMIT_3000MA 0 + static enum ilim_config current_ilim_config = ILIM_CONFIG_MANUAL_OFF; static void board_ilim_use_gpio(void) @@ -130,10 +137,25 @@ static void usb_device_change(int dev_type) else gpio_set_level(GPIO_BOOST_EN, 1); - if (dev_type & TSU6721_TYPE_VBUS_DEBOUNCED) + if (dev_type & TSU6721_TYPE_VBUS_DEBOUNCED) { + /* Limit USB port current. 500mA for not listed types. */ + int current_limit = I_LIMIT_500MA; + if (dev_type & TSU6721_TYPE_CHG12) + current_limit = I_LIMIT_3000MA; + else if (dev_type & TSU6721_TYPE_APPLE_CHG) { + /* TODO: Distinguish 1A/2A chargers. */ + current_limit = I_LIMIT_1000MA; + } else if ((dev_type & TSU6721_TYPE_CDP) || + (dev_type & TSU6721_TYPE_DCP)) + current_limit = I_LIMIT_1500MA; + + board_pwm_duty_cycle(current_limit); + + /* Turns on battery LED */ lp5562_poweron(); - else + } else { lp5562_poweroff(); + } /* Log to console */ CPRINTF("[%T USB Attached: "); |