cheza: Make USB mux handled by TCPC chips and HPD handled by AP

In Cheza design, the USB mux (switching USB lanes to DP and/or USB SS)
is handled by TCPC chips and the HPD is handled by AP (DP PHY).

The CL adds some custom drivers to override the get() function
(Linux extcon driver uses it to check the USB mux and HPD IRQ) by
checking the virtual driver and redirect the other functions to the
TCPC drivers.

BRANCH=none
BUG=b:118898133
TEST=Manually added a new console command to issue a HPD IRQ.
+static int command_hpd_irq(int argc, char **argv)
+{
+       char *e;
+       int port;
+       const struct usb_mux *mux;
+
+       if (argc != 2)
+               return EC_ERROR_PARAM_COUNT;
+
+       port = strtoi(argv[1], &e, 10);
+       if (*e || port >= CONFIG_USB_PD_PORT_COUNT)
+               return EC_ERROR_PARAM1;
+
+       mux = &usb_muxes[port];
+       mux->hpd_update(port, 0, 1);
+       return EC_SUCCESS;
+}
+DECLARE_CONSOLE_COMMAND(hpd_irq, command_hpd_irq,
+                       "[port]",
+                       "Issue a HPD IRQ");

In EC console, typed "hpd_irq 0" and checked the result on AP:
localhost ~ # ectool usbpdmuxinfo 0
Port 0: USB DP HPD_IRQ
Port 1: USB INV

Checked it again and HPD_IRQ should be cleared.
localhost ~ # ectool usbpdmuxinfo 0
Port 0: USB DP
Port 1: USB INV

Change-Id: I4ddc274a637393391dd654c9ee75de7646746ad5
Signed-off-by: Wai-Hong Tam <waihong@google.com>
Reviewed-on: https://chromium-review.googlesource.com/1316370
Reviewed-by: Stephen Boyd <swboyd@chromium.org>

0 files changed, 0 insertions, 0 deletions