1 // SPDX-License-Identifier: GPL-2.0-or-later
3  *      uvc_isight.c  --  USB Video Class driver - iSight support
5  *	Copyright (C) 2006-2007
6  *		Ivan N. Zlatev <contact@i-nz.net>
7  *	Copyright (C) 2008-2009
18  * Built-in iSight webcams implements most of UVC 1.0 except a
25  * ------------------------------------------------------------------
27  * 0x01	1	Flags (UVC-compliant)
32  * The header can be prefixed by an optional, unknown-purpose byte.
46 	u8 *mem;  in isight_decode()  local
54 		uvc_dbg(stream->dev, FRAME, "iSight header found\n");  in isight_decode()
59 	if (buf->state != UVC_BUF_STATE_ACTIVE) {  in isight_decode()
61 			uvc_dbg(stream->dev, FRAME,  in isight_decode()
66 		buf->state = UVC_BUF_STATE_ACTIVE;  in isight_decode()
75 	if (is_header && buf->bytesused != 0) {  in isight_decode()
76 		buf->state = UVC_BUF_STATE_DONE;  in isight_decode()
77 		return -EAGAIN;  in isight_decode()
81 	 * Copy the video data to the buffer. Skip header packets, as they  in isight_decode()
85 		maxlen = buf->length - buf->bytesused;  in isight_decode()
86 		mem = buf->mem + buf->bytesused;  in isight_decode()
88 		memcpy(mem, data, nbytes);  in isight_decode()
89 		buf->bytesused += nbytes;  in isight_decode()
91 		if (len > maxlen || buf->bytesused == buf->length) {  in isight_decode()
92 			uvc_dbg(stream->dev, FRAME,  in isight_decode()
94 			buf->state = UVC_BUF_STATE_DONE;  in isight_decode()
104 	struct urb *urb = uvc_urb->urb;  in uvc_video_decode_isight()
105 	struct uvc_streaming *stream = uvc_urb->stream;  in uvc_video_decode_isight()
108 	for (i = 0; i < urb->number_of_packets; ++i) {  in uvc_video_decode_isight()
109 		if (urb->iso_frame_desc[i].status < 0) {  in uvc_video_decode_isight()
110 			uvc_dbg(stream->dev, FRAME,  in uvc_video_decode_isight()
112 				urb->iso_frame_desc[i].status);  in uvc_video_decode_isight()
126 			ret = isight_decode(&stream->queue, buf,  in uvc_video_decode_isight()
127 					urb->transfer_buffer +  in uvc_video_decode_isight()
128 					urb->iso_frame_desc[i].offset,  in uvc_video_decode_isight()
129 					urb->iso_frame_desc[i].actual_length);  in uvc_video_decode_isight()
134 			if (buf->state == UVC_BUF_STATE_DONE ||  in uvc_video_decode_isight()
135 			    buf->state == UVC_BUF_STATE_ERROR)  in uvc_video_decode_isight()
136 				buf = uvc_queue_next_buffer(&stream->queue,  in uvc_video_decode_isight()
138 		} while (ret == -EAGAIN);  in uvc_video_decode_isight()