diff options
| author | Vincent Palatin <vpalatin@chromium.org> | 2014-07-07 19:20:35 -0700 |
|---|---|---|
| committer | chrome-internal-fetch <chrome-internal-fetch@google.com> | 2014-07-08 19:30:36 +0000 |
| commit | eaddeb502e78f93c670fe47dc489090867ec838d (patch) | |
| tree | f11f41af57b3e105c727488c0b76fe1a319b4544 | |
| parent | 3becb4c5c3267507fa6de7e99821783b1187e8d2 (diff) | |
| download | chrome-ec-eaddeb502e78f93c670fe47dc489090867ec838d.tar.gz | |
firefly: add VBUS detection
Enable the VBUS detection to be able to re-negociate a PD contract when
we are losing power.
The VBUS_WAKE GPIO is broken on the current hardware (not triggered when
VBUS is 5V), so we fall back on using the ADC on VBUS_SENSE.
Signed-off-by: Vincent Palatin <vpalatin@chromium.org>
BRANCH=none
BUG=none
TEST=With a Firefly connected to a Zinger,"fault" the power supply to
get it to turn off its output. See Firefly detecting the cut-off and
re-negotiating voltage.
Change-Id: Ia5f0734cbd8f20d84ce170cea191410bb72a87c3
Reviewed-on: https://chromium-review.googlesource.com/206944
Tested-by: Vincent Palatin <vpalatin@chromium.org>
Reviewed-by: Alec Berg <alecaberg@chromium.org>
Commit-Queue: Vincent Palatin <vpalatin@chromium.org>
| -rw-r--r-- | board/firefly/usb_pd_config.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/board/firefly/usb_pd_config.h b/board/firefly/usb_pd_config.h index eea9688842..eb23bc830c 100644 --- a/board/firefly/usb_pd_config.h +++ b/board/firefly/usb_pd_config.h @@ -107,7 +107,8 @@ static inline int pd_adc_read(int cc) static inline int pd_snk_is_vbus_provided(void) { - return 1; + /* VBUS_WAKE is broken (not detecting 5V), use the ADC instead */ + return adc_read_channel(ADC_CH_VBUS_SENSE) > 4000; } /* Standard-current DFP : no-connect voltage is 1.55V */ |