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greybus: es2: implement cport reset control request

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Toshiba UniPro IP requires to reset the CPort that has been used in a previous
connection. This commit implement a new control request in order to
reset CPorts on an APBridgeA.

Signed-off-by: Fabien Parent <fparent@baylibre.com>
Reviewed-by: Johan Hovold <johan@hovoldconsulting.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
This commit is contained in:
Fabien Parent 2015-10-13 17:34:50 +02:00 committed by Greg Kroah-Hartman
parent f064b872e7
commit 82ee1e6cde
1 changed files with 37 additions and 0 deletions
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37
drivers/staging/greybus/es2.c
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@ -58,6 +58,9 @@ static DEFINE_KFIFO(apb1_log_fifo, char, APB1_LOG_SIZE);
/* vendor request to get the number of cports available */
#define REQUEST_CPORT_COUNT 0x04
/* vendor request to reset a cport state */
#define REQUEST_RESET_CPORT 0x05
/*
* @endpoint: bulk in endpoint for CPort data
* @urb: array of urbs for the CPort in messages
@ -376,10 +379,44 @@ static void message_cancel(struct gb_message *message)
usb_free_urb(urb);
}
static int cport_reset(struct greybus_host_device *hd, u16 cport_id)
{
struct es1_ap_dev *es1 = hd_to_es1(hd);
struct usb_device *udev = es1->usb_dev;
int retval;
retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
REQUEST_RESET_CPORT,
USB_DIR_OUT | USB_TYPE_VENDOR |
USB_RECIP_INTERFACE, 0, cport_id,
NULL, 0, ES1_TIMEOUT);
if (retval < 0) {
dev_err(&udev->dev, "failed to reset cport %hu: %d\n", cport_id,
retval);
return retval;
}
return 0;
}
static int cport_enable(struct greybus_host_device *hd, u16 cport_id)
{
int retval;
if (cport_id != GB_SVC_CPORT_ID) {
retval = cport_reset(hd, cport_id);
if (retval)
return retval;
}
return 0;
}
static struct greybus_host_driver es1_driver = {
.hd_priv_size = sizeof(struct es1_ap_dev),
.message_send = message_send,
.message_cancel = message_cancel,
.cport_enable = cport_enable,
};
/* Common function to report consistent warnings based on URB status */