From 52defe8f65700ad625c3ca63f723564210b2dc82 Mon Sep 17 00:00:00 2001 From: Hans de Goede Date: Mon, 16 Feb 2015 22:13:43 +0100 Subject: sunxi: musb: Check Vbus-det before enabling otg port power Sending out 5V when there is a charger connected to the otg port is not a good idea, so check for this and error out. Note this commit currently breaks otg support on the q8h tablets, as we need to do some magic with the pmic there to get vbus info, this is deliberate (better safe then sorry), fixing this is on my TODO list. Signed-off-by: Hans de Goede Acked-by: Ian Campbell --- drivers/usb/musb-new/sunxi.c | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) (limited to 'drivers/usb/musb-new/sunxi.c') diff --git a/drivers/usb/musb-new/sunxi.c b/drivers/usb/musb-new/sunxi.c index 4646a3d9fe..fe45db1e06 100644 --- a/drivers/usb/musb-new/sunxi.c +++ b/drivers/usb/musb-new/sunxi.c @@ -22,7 +22,9 @@ */ #include #include +#include #include +#include #include "linux-compat.h" #include "musb_core.h" @@ -224,6 +226,33 @@ static int sunxi_musb_init(struct musb *musb) pr_debug("%s():\n", __func__); + if (is_host_enabled(musb)) { + int vbus_det = sunxi_name_to_gpio(CONFIG_USB0_VBUS_DET); + if (vbus_det == -1) { + eprintf("Error invalid Vusb-det pin\n"); + return -EINVAL; + } + + err = gpio_request(vbus_det, "vbus0_det"); + if (err) + return err; + + err = gpio_direction_input(vbus_det); + if (err) { + gpio_free(vbus_det); + return err; + } + + err = gpio_get_value(vbus_det); + if (err) { + eprintf("Error: A charger is plugged into the OTG\n"); + gpio_free(vbus_det); + return -EIO; + } + + gpio_free(vbus_det); + } + err = sunxi_usbc_request_resources(0); if (err) return err; -- cgit v1.2.1