330 lines
9.4 KiB
C
330 lines
9.4 KiB
C
/*
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* SQ905C subdriver
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*
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* Copyright (C) 2009 Theodore Kilgore
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/*
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*
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* This driver uses work done in
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* libgphoto2/camlibs/digigr8, Copyright (C) Theodore Kilgore.
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*
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* This driver has also used as a base the sq905c driver
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* and may contain code fragments from it.
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*/
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#define MODULE_NAME "sq905c"
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#include <linux/workqueue.h>
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#include "gspca.h"
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MODULE_AUTHOR("Theodore Kilgore <kilgota@auburn.edu>");
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MODULE_DESCRIPTION("GSPCA/SQ905C USB Camera Driver");
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MODULE_LICENSE("GPL");
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/* Default timeouts, in ms */
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#define SQ905C_CMD_TIMEOUT 500
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#define SQ905C_DATA_TIMEOUT 1000
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/* Maximum transfer size to use. */
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#define SQ905C_MAX_TRANSFER 0x8000
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#define FRAME_HEADER_LEN 0x50
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/* Commands. These go in the "value" slot. */
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#define SQ905C_CLEAR 0xa0 /* clear everything */
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#define SQ905C_CAPTURE_LOW 0xa040 /* Starts capture at 160x120 */
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#define SQ905C_CAPTURE_MED 0x1440 /* Starts capture at 320x240 */
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#define SQ905C_CAPTURE_HI 0x2840 /* Starts capture at 320x240 */
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/* For capture, this must go in the "index" slot. */
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#define SQ905C_CAPTURE_INDEX 0x110f
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/* Structure to hold all of our device specific stuff */
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struct sd {
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struct gspca_dev gspca_dev; /* !! must be the first item */
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const struct v4l2_pix_format *cap_mode;
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/* Driver stuff */
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struct work_struct work_struct;
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struct workqueue_struct *work_thread;
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};
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/*
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* Most of these cameras will do 640x480 and 320x240. 160x120 works
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* in theory but gives very poor output. Therefore, not supported.
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* The 0x2770:0x9050 cameras have max resolution of 320x240.
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*/
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static struct v4l2_pix_format sq905c_mode[] = {
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{ 320, 240, V4L2_PIX_FMT_SQ905C, V4L2_FIELD_NONE,
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.bytesperline = 320,
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.sizeimage = 320 * 240,
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.colorspace = V4L2_COLORSPACE_SRGB,
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.priv = 0},
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{ 640, 480, V4L2_PIX_FMT_SQ905C, V4L2_FIELD_NONE,
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.bytesperline = 640,
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.sizeimage = 640 * 480,
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.colorspace = V4L2_COLORSPACE_SRGB,
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.priv = 0}
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};
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/* Send a command to the camera. */
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static int sq905c_command(struct gspca_dev *gspca_dev, u16 command, u16 index)
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{
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int ret;
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ret = usb_control_msg(gspca_dev->dev,
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usb_sndctrlpipe(gspca_dev->dev, 0),
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USB_REQ_SYNCH_FRAME, /* request */
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USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
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command, index, NULL, 0,
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SQ905C_CMD_TIMEOUT);
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if (ret < 0) {
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PDEBUG(D_ERR, "%s: usb_control_msg failed (%d)",
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__func__, ret);
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return ret;
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}
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return 0;
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}
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/* This function is called as a workqueue function and runs whenever the camera
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* is streaming data. Because it is a workqueue function it is allowed to sleep
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* so we can use synchronous USB calls. To avoid possible collisions with other
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* threads attempting to use the camera's USB interface the gspca usb_lock is
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* used when performing the one USB control operation inside the workqueue,
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* which tells the camera to close the stream. In practice the only thing
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* which needs to be protected against is the usb_set_interface call that
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* gspca makes during stream_off. Otherwise the camera doesn't provide any
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* controls that the user could try to change.
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*/
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static void sq905c_dostream(struct work_struct *work)
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{
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struct sd *dev = container_of(work, struct sd, work_struct);
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struct gspca_dev *gspca_dev = &dev->gspca_dev;
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struct gspca_frame *frame;
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int bytes_left; /* bytes remaining in current frame. */
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int data_len; /* size to use for the next read. */
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int act_len;
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int discarding = 0; /* true if we failed to get space for frame. */
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int packet_type;
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int ret;
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u8 *buffer;
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buffer = kmalloc(SQ905C_MAX_TRANSFER, GFP_KERNEL | GFP_DMA);
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if (!buffer) {
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PDEBUG(D_ERR, "Couldn't allocate USB buffer");
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goto quit_stream;
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}
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while (gspca_dev->present && gspca_dev->streaming) {
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if (!gspca_dev->present)
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goto quit_stream;
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/* Request the header, which tells the size to download */
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ret = usb_bulk_msg(gspca_dev->dev,
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usb_rcvbulkpipe(gspca_dev->dev, 0x81),
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buffer, FRAME_HEADER_LEN, &act_len,
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SQ905C_DATA_TIMEOUT);
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PDEBUG(D_STREAM,
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"Got %d bytes out of %d for header",
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act_len, FRAME_HEADER_LEN);
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if (ret < 0 || act_len < FRAME_HEADER_LEN)
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goto quit_stream;
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/* size is read from 4 bytes starting 0x40, little endian */
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bytes_left = buffer[0x40]|(buffer[0x41]<<8)|(buffer[0x42]<<16)
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|(buffer[0x43]<<24);
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PDEBUG(D_STREAM, "bytes_left = 0x%x", bytes_left);
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/* We keep the header. It has other information, too. */
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packet_type = FIRST_PACKET;
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frame = gspca_get_i_frame(gspca_dev);
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if (frame && !discarding) {
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gspca_frame_add(gspca_dev, packet_type,
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frame, buffer, FRAME_HEADER_LEN);
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} else
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discarding = 1;
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while (bytes_left > 0) {
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data_len = bytes_left > SQ905C_MAX_TRANSFER ?
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SQ905C_MAX_TRANSFER : bytes_left;
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if (!gspca_dev->present)
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goto quit_stream;
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ret = usb_bulk_msg(gspca_dev->dev,
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usb_rcvbulkpipe(gspca_dev->dev, 0x81),
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buffer, data_len, &act_len,
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SQ905C_DATA_TIMEOUT);
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if (ret < 0 || act_len < data_len)
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goto quit_stream;
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PDEBUG(D_STREAM,
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"Got %d bytes out of %d for frame",
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data_len, bytes_left);
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bytes_left -= data_len;
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if (bytes_left == 0)
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packet_type = LAST_PACKET;
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else
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packet_type = INTER_PACKET;
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frame = gspca_get_i_frame(gspca_dev);
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if (frame && !discarding)
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gspca_frame_add(gspca_dev, packet_type,
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frame, buffer, data_len);
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else
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discarding = 1;
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}
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}
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quit_stream:
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mutex_lock(&gspca_dev->usb_lock);
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if (gspca_dev->present)
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sq905c_command(gspca_dev, SQ905C_CLEAR, 0);
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mutex_unlock(&gspca_dev->usb_lock);
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kfree(buffer);
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}
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/* This function is called at probe time just before sd_init */
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static int sd_config(struct gspca_dev *gspca_dev,
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const struct usb_device_id *id)
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{
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struct cam *cam = &gspca_dev->cam;
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struct sd *dev = (struct sd *) gspca_dev;
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PDEBUG(D_PROBE,
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"SQ9050 camera detected"
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" (vid/pid 0x%04X:0x%04X)", id->idVendor, id->idProduct);
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cam->cam_mode = sq905c_mode;
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cam->nmodes = 2;
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if (id->idProduct == 0x9050)
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cam->nmodes = 1;
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/* We don't use the buffer gspca allocates so make it small. */
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cam->bulk_size = 32;
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cam->bulk = 1;
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INIT_WORK(&dev->work_struct, sq905c_dostream);
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return 0;
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}
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/* called on streamoff with alt==0 and on disconnect */
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/* the usb_lock is held at entry - restore on exit */
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static void sd_stop0(struct gspca_dev *gspca_dev)
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{
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struct sd *dev = (struct sd *) gspca_dev;
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/* wait for the work queue to terminate */
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mutex_unlock(&gspca_dev->usb_lock);
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/* This waits for sq905c_dostream to finish */
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destroy_workqueue(dev->work_thread);
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dev->work_thread = NULL;
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mutex_lock(&gspca_dev->usb_lock);
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}
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/* this function is called at probe and resume time */
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static int sd_init(struct gspca_dev *gspca_dev)
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{
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int ret;
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/* connect to the camera and reset it. */
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ret = sq905c_command(gspca_dev, SQ905C_CLEAR, 0);
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return ret;
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}
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/* Set up for getting frames. */
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static int sd_start(struct gspca_dev *gspca_dev)
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{
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struct sd *dev = (struct sd *) gspca_dev;
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int ret;
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dev->cap_mode = gspca_dev->cam.cam_mode;
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/* "Open the shutter" and set size, to start capture */
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switch (gspca_dev->width) {
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case 640:
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PDEBUG(D_STREAM, "Start streaming at high resolution");
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dev->cap_mode++;
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ret = sq905c_command(gspca_dev, SQ905C_CAPTURE_HI,
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SQ905C_CAPTURE_INDEX);
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break;
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default: /* 320 */
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PDEBUG(D_STREAM, "Start streaming at medium resolution");
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ret = sq905c_command(gspca_dev, SQ905C_CAPTURE_MED,
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SQ905C_CAPTURE_INDEX);
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}
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if (ret < 0) {
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PDEBUG(D_ERR, "Start streaming command failed");
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return ret;
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}
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/* Start the workqueue function to do the streaming */
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dev->work_thread = create_singlethread_workqueue(MODULE_NAME);
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queue_work(dev->work_thread, &dev->work_struct);
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return 0;
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}
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/* Table of supported USB devices */
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static const __devinitdata struct usb_device_id device_table[] = {
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{USB_DEVICE(0x2770, 0x905c)},
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{USB_DEVICE(0x2770, 0x9050)},
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{USB_DEVICE(0x2770, 0x913d)},
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{}
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};
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MODULE_DEVICE_TABLE(usb, device_table);
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/* sub-driver description */
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static const struct sd_desc sd_desc = {
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.name = MODULE_NAME,
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.config = sd_config,
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.init = sd_init,
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.start = sd_start,
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.stop0 = sd_stop0,
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};
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/* -- device connect -- */
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static int sd_probe(struct usb_interface *intf,
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const struct usb_device_id *id)
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{
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return gspca_dev_probe(intf, id,
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&sd_desc,
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sizeof(struct sd),
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THIS_MODULE);
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}
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static struct usb_driver sd_driver = {
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.name = MODULE_NAME,
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.id_table = device_table,
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.probe = sd_probe,
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.disconnect = gspca_disconnect,
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#ifdef CONFIG_PM
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.suspend = gspca_suspend,
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.resume = gspca_resume,
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#endif
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};
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/* -- module insert / remove -- */
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static int __init sd_mod_init(void)
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{
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int ret;
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ret = usb_register(&sd_driver);
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if (ret < 0)
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return ret;
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PDEBUG(D_PROBE, "registered");
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return 0;
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}
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static void __exit sd_mod_exit(void)
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{
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usb_deregister(&sd_driver);
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PDEBUG(D_PROBE, "deregistered");
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}
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module_init(sd_mod_init);
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module_exit(sd_mod_exit);
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