/*
* Returns zero if the message was successfully queued, or a negative errno
* otherwise.
*/
static int message_send(struct gb_host_device *hd, u16 cport_id,
struct gb_message *message, gfp_t gfp_mask)
{
struct es2_ap_dev *es2 = hd_to_es2(hd);
struct usb_device *udev = es2->usb_dev;
size_t buffer_size;
int retval;
struct urb *urb;
int ep_pair;
unsigned long flags;
/*
* The data actually transferred will include an indication
* of where the data should be sent. Do one last check of
* the target CPort id before filling it in.
*/
if (!cport_id_valid(hd, cport_id)) {
dev_err(&udev->dev, "invalid destination cport 0x%02x\n",
cport_id);
return -EINVAL;
}
/* Find a free urb */
urb = next_free_urb(es2, gfp_mask);
if (!urb)
return -ENOMEM;
spin_lock_irqsave(&es2->cport_out_urb_lock, flags);
message->hcpriv = urb;
spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags);
/* Pack the cport id into the message header */
gb_message_cport_pack(message->header, cport_id);
buffer_size = sizeof(*message->header) + message->payload_size;
ep_pair = cport_to_ep_pair(es2, cport_id);
usb_fill_bulk_urb(urb, udev,
usb_sndbulkpipe(udev,
es2->cport_out[ep_pair].endpoint),
message->buffer, buffer_size,
cport_out_callback, message);
urb->transfer_flags |= URB_ZERO_PACKET;
trace_gb_host_device_send(hd, cport_id, buffer_size);
retval = usb_submit_urb(urb, gfp_mask);
if (retval) {
dev_err(&udev->dev, "failed to submit out-urb: %d\n", retval);
spin_lock_irqsave(&es2->cport_out_urb_lock, flags);
message->hcpriv = NULL;
spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags);
free_urb(es2, urb);
gb_message_cport_clear(message->header);
return retval;
}
return 0;
}
static void cport_in_callback(struct urb *urb)
{
struct gb_host_device *hd = urb->context;
struct device *dev = &urb->dev->dev;
struct gb_operation_msg_hdr *header;
int status = check_urb_status(urb);
int retval;
u16 cport_id;
if (status) {
if ((status == -EAGAIN) || (status == -EPROTO))
goto exit;
/* The urb is being unlinked */
if (status == -ENOENT || status == -ESHUTDOWN)
return;
dev_err(dev, "urb cport in error %d (dropped)\n", status);
return;
}
if (urb->actual_length < sizeof(*header)) {
dev_err(dev, "short message received\n");
goto exit;
}
/* Extract the CPort id, which is packed in the message header */
header = urb->transfer_buffer;
cport_id = gb_message_cport_unpack(header);
if (cport_id_valid(hd, cport_id)) {
trace_gb_host_device_recv(hd, cport_id, urb->actual_length);
greybus_data_rcvd(hd, cport_id, urb->transfer_buffer,
urb->actual_length);
} else {
dev_err(dev, "invalid cport id %u received\n", cport_id);
}
exit:
/* put our urb back in the request pool */
retval = usb_submit_urb(urb, GFP_ATOMIC);
if (retval)
dev_err(dev, "failed to resubmit in-urb: %d\n", retval);
}
static int latency_tag_disable(struct gb_host_device *hd, u16 cport_id)
{
int retval;
struct es2_ap_dev *es2 = hd_to_es2(hd);
struct usb_device *udev = es2->usb_dev;
if (!cport_id_valid(hd, cport_id)) {
dev_err(&udev->dev, "invalid cport %u\n", cport_id);
return -EINVAL;
}
retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
GB_APB_REQUEST_LATENCY_TAG_DIS,
USB_DIR_OUT | USB_TYPE_VENDOR |
USB_RECIP_INTERFACE, cport_id, 0, NULL,
0, ES2_TIMEOUT);
if (retval < 0)
dev_err(&udev->dev, "Cannot disable latency tag for cport %d\n",
cport_id);
return retval;
}
