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pd: Add support for multiple distinct TCPC alert signals

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If multiple TCPCs are present on a system then we may have multiple
alert signals, each of which alerts us to the status of a different
TCPC. Make boards with external non cros-ec TCPCs define
tcpc_get_alert_status, which returns alert status based upon any alert
GPIOs present, and then service only ports which are alerting.

BUG=chromium:551683,chrome-os-partner:47851
TEST=Verify snoball PDCMD task sleeps appropriately when no devices are
inserted, and verify ports go to PD_DISCOVERY state when we attach
samus. Also verify that glados / glados_pd can still negotiate PD.
BRANCH=None

Change-Id: Iae6c4e1ef4d6685cb5bf7feef713505925a07c8c
Signed-off-by: Shawn Nematbakhsh <shawnn@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/313209
Commit-Ready: Shawn N <shawnn@chromium.org>
Tested-by: Shawn N <shawnn@chromium.org>
Reviewed-by: Alec Berg <alecaberg@chromium.org>
This commit is contained in:
Shawn Nematbakhsh
2015-11-19 16:51:37 -08:00
committed by chrome-bot
parent 9665d0b1df
commit 767e132d13
5 changed files with 53 additions and 11 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
include/usb_pd_tcpm.h
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@@ -56,6 +56,14 @@ struct tcpc_config_t {
*/
};
/**
* Returns the PD_STATUS_TCPC_ALERT_* mask corresponding to the TCPC ports
* that are currently asserting ALERT.
*
* @return PD_STATUS_TCPC_ALERT_* mask.
*/
uint16_t tcpc_get_alert_status(void);
/**
* Initialize TCPM driver and wait for TCPC readiness.
*