The SQ905C cameras (0x2770:0x905C) cameras, as well as two other closely
related varieties (0x2770:0x9050 and 0x2770:0x913D) are supported in what
follows.
These cameras are the successors in the marketplace of the SQ905 cameras. They
are similar to the SQ905 cameras, in that they use bulk transport while
streaming, and thus the driver functions similarly, using a workqueue to
perform the streaming. However, there are also some serious
differences. These differences include
-- a different structure of the commands
-- commands do not pass a data byte to the camera
-- commands do not require a subsequent "read" operation
-- while streaming, there are no commands sent during a frame download, nor is
there an ack between frames. Thus, the only command sent during streaming is a
command to quit streaming.
-- frame header is of a different size
-- the SQ905C cameras all stream compressed data, whereas the data for
the older SQ905 cameras is not compressed
-- since compressed frames are of variable size, the frame header is read
first and contains the data size for the coming frame
-- the supported resolution settings are different
I should also mention that the introduction of support for these cameras
requires an additional fourcc code to be introduced in
linux/include/linux/videodev2.h, and the addition of the decompression
algorithm in libv4lconvert. I have submitted the libv4lconvert patch a couple
of days ago.
The code in the new sq905c.c is based upon the structure of the code in
gspca/sq905.c, and upon the code in libgphoto2/camlibs/digigr8, which supports
the same set of cameras in stillcam mode. I am a co-author of gspca/sq905.c and
I am the sole author of libgphoto2/camlibs/digigr8, which is licensed under the
LGPL. I hereby give myself permission to use my own code from libgphoto2 in
gspca/sq905c.c.
Signed-off-by Theodore Kilgore <kilgota@xxxxxxxxxx>
-------------------------------------------------------------------------
diff -uprN linuxa/drivers/media/video/gspca/Kconfig linuxb/drivers/media/video/gspca/Kconfig
--- linuxa/drivers/media/video/gspca/Kconfig 2009-02-23 23:59:07.000000000 -0600
+++ linuxb/drivers/media/video/gspca/Kconfig 2009-02-28 19:55:49.000000000 -0600
@@ -185,6 +185,15 @@ config USB_GSPCA_SQ905
To compile this driver as a module, choose M here: the
module will be called gspca_sq905.
+config USB_GSPCA_SQ905C
+ tristate "SQ Technologies SQ905C based USB Camera Driver"
+ depends on VIDEO_V4L2 && USB_GSPCA
+ help
+ Say Y here if you want support for cameras based on the SQ905C chip.
+
+ To compile this driver as a module, choose M here: the
+ module will be called gspca_sq905c.
+
config USB_GSPCA_STK014
tristate "Syntek DV4000 (STK014) USB Camera Driver"
depends on VIDEO_V4L2 && USB_GSPCA
diff -uprN linuxa/drivers/media/video/gspca/Makefile linuxb/drivers/media/video/gspca/Makefile
--- linuxa/drivers/media/video/gspca/Makefile 2009-02-23 23:59:07.000000000 -0600
+++ linuxb/drivers/media/video/gspca/Makefile 2009-02-28 19:54:54.000000000 -0600
@@ -17,6 +17,7 @@ obj-$(CONFIG_USB_GSPCA_SPCA506) += gspc
obj-$(CONFIG_USB_GSPCA_SPCA508) += gspca_spca508.o
obj-$(CONFIG_USB_GSPCA_SPCA561) += gspca_spca561.o
obj-$(CONFIG_USB_GSPCA_SQ905) += gspca_sq905.o
+obj-$(CONFIG_USB_GSPCA_SQ905C) += gspca_sq905c.o
obj-$(CONFIG_USB_GSPCA_SUNPLUS) += gspca_sunplus.o
obj-$(CONFIG_USB_GSPCA_STK014) += gspca_stk014.o
obj-$(CONFIG_USB_GSPCA_T613) += gspca_t613.o
@@ -43,6 +44,7 @@ gspca_spca506-objs := spca506.o
gspca_spca508-objs := spca508.o
gspca_spca561-objs := spca561.o
gspca_sq905-objs := sq905.o
+gspca_sq905c-objs := sq905c.o
gspca_stk014-objs := stk014.o
gspca_sunplus-objs := sunplus.o
gspca_t613-objs := t613.o
diff -uprN linuxa/drivers/media/video/gspca/sq905c.c linuxb/drivers/media/video/gspca/sq905c.c
--- linuxa/drivers/media/video/gspca/sq905c.c 1969-12-31 18:00:00.000000000 -0600
+++ linuxb/drivers/media/video/gspca/sq905c.c 2009-03-04 16:38:42.000000000 -0600
@@ -0,0 +1,328 @@
+/*
+ * SQ905C subdriver
+ *
+ * Copyright (C) 2009 Theodore Kilgore
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+/*
+ *
+ * This driver uses work done in
+ * libgphoto2/camlibs/digigr8, Copyright (C) Theodore Kilgore.
+ *
+ * This driver has also used as a base the sq905c driver
+ * and may contain code fragments from it.
+ */
+
+#define MODULE_NAME "sq905c"
+
+#include <linux/workqueue.h>
+#include "gspca.h"
+
+MODULE_AUTHOR("Theodore Kilgore <kilgota@xxxxxxxxxx>");
+MODULE_DESCRIPTION("GSPCA/SQ905C USB Camera Driver");
+MODULE_LICENSE("GPL");
+
+/* Default timeouts, in ms */
+#define SQ905C_CMD_TIMEOUT 500
+#define SQ905C_DATA_TIMEOUT 1000
+
+/* Maximum transfer size to use. */
+#define SQ905C_MAX_TRANSFER 0x8000
+
+#define FRAME_HEADER_LEN 0x50
+
+/* Commands. These go in the "value" slot. */
+#define SQ905C_CLEAR 0xa0 /* clear everything */
+#define SQ905C_CAPTURE_LOW 0xa040 /* Starts capture at 160x120 */
+#define SQ905C_CAPTURE_MED 0x1440 /* Starts capture at 320x240 */
+#define SQ905C_CAPTURE_HI 0x2840 /* Starts capture at 320x240 */
+
+/* For capture, this must go in the "index" slot. */
+#define SQ905C_CAPTURE_INDEX 0x110f
+
+/* Structure to hold all of our device specific stuff */
+struct sd {
+ struct gspca_dev gspca_dev; /* !! must be the first item */
+ const struct v4l2_pix_format *cap_mode;
+ /* Driver stuff */
+ struct work_struct work_struct;
+ struct workqueue_struct *work_thread;
+};
+
+/*
+ * Most of these cameras will do 640x480 and 320x240. 160x120 works
+ * in theory but gives very poor output. Therefore, not supported.
+ * The 0x2770:0x9050 cameras have max resolution of 320x240.
+ */
+static struct v4l2_pix_format sq905c_mode[] = {
+ { 320, 240, V4L2_PIX_FMT_SQ905C, V4L2_FIELD_NONE,
+ .bytesperline = 320,
+ .sizeimage = 320 * 240,
+ .colorspace = V4L2_COLORSPACE_SRGB,
+ .priv = 0},
+ { 640, 480, V4L2_PIX_FMT_SQ905C, V4L2_FIELD_NONE,
+ .bytesperline = 640,
+ .sizeimage = 640 * 480,
+ .colorspace = V4L2_COLORSPACE_SRGB,
+ .priv = 0}
+};
+
+/* Send a command to the camera. */
+static int sq905c_command(struct gspca_dev *gspca_dev, u16 command, u16 index)
+{
+ int ret;
+
+ ret = usb_control_msg(gspca_dev->dev,
+ usb_sndctrlpipe(gspca_dev->dev, 0),
+ USB_REQ_SYNCH_FRAME, /* request */
+ USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
+ command, index, NULL, 0,
+ SQ905C_CMD_TIMEOUT);
+ if (ret < 0) {
+ PDEBUG(D_ERR, "%s: usb_control_msg failed (%d)",
+ __func__, ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+/* This function is called as a workqueue function and runs whenever the camera
+ * is streaming data. Because it is a workqueue function it is allowed to sleep
+ * so we can use synchronous USB calls. To avoid possible collisions with other
+ * threads attempting to use the camera's USB interface the gspca usb_lock is
+ * used when performing the one USB control operation inside the workqueue,
+ * which tells the camera to close the stream. In practice the only thing
+ * which needs to be protected against is the usb_set_interface call that
+ * gspca makes during stream_off. Otherwise the camera doesn't provide any
+ * controls that the user could try to change.
+ */
+static void sq905c_dostream(struct work_struct *work)
+{
+ struct sd *dev = container_of(work, struct sd, work_struct);
+ struct gspca_dev *gspca_dev = &dev->gspca_dev;
+ struct gspca_frame *frame;
+ int bytes_left; /* bytes remaining in current frame. */
+ int data_len; /* size to use for the next read. */
+ int act_len;
+ int discarding = 0; /* true if we failed to get space for frame. */
+ int packet_type;
+ int ret;
+ u8 *buffer;
+
+ buffer = kmalloc(SQ905C_MAX_TRANSFER, GFP_KERNEL | GFP_DMA);
+ if (!buffer) {
+ PDEBUG(D_ERR, "Couldn't allocate USB buffer");
+ goto quit_stream;
+ }
+
+ while (gspca_dev->present && gspca_dev->streaming) {
+ if (!gspca_dev->present)
+ goto quit_stream;
+ /* Request the header, which tells the size to download */
+ ret = usb_bulk_msg(gspca_dev->dev,
+ usb_rcvbulkpipe(gspca_dev->dev, 0x81),
+ buffer, FRAME_HEADER_LEN, &act_len,
+ SQ905C_DATA_TIMEOUT);
+ PDEBUG(D_STREAM,
+ "Got %d bytes out of %d for header",
+ act_len, FRAME_HEADER_LEN);
+ if (ret < 0 || act_len < FRAME_HEADER_LEN)
+ goto quit_stream;
+ /* size is read from 4 bytes starting 0x40, little endian */
+ bytes_left = buffer[0x40]|(buffer[0x41]<<8)|(buffer[0x42]<<16)
+ |(buffer[0x43]<<24);
+ PDEBUG(D_STREAM, "bytes_left = 0x%x", bytes_left);
+ /* We keep the header. It has other information, too. */
+ packet_type = FIRST_PACKET;
+ frame = gspca_get_i_frame(gspca_dev);
+ if (frame && !discarding) {
+ gspca_frame_add(gspca_dev, packet_type,
+ frame, buffer, FRAME_HEADER_LEN);
+ } else
+ discarding = 1;
+ while (bytes_left > 0) {
+ data_len = bytes_left > SQ905C_MAX_TRANSFER ?
+ SQ905C_MAX_TRANSFER : bytes_left;
+ if (!gspca_dev->present)
+ goto quit_stream;
+ ret = usb_bulk_msg(gspca_dev->dev,
+ usb_rcvbulkpipe(gspca_dev->dev, 0x81),
+ buffer, data_len, &act_len,
+ SQ905C_DATA_TIMEOUT);
+ if (ret < 0 || act_len < data_len)
+ goto quit_stream;
+ PDEBUG(D_STREAM,
+ "Got %d bytes out of %d for frame",
+ data_len, bytes_left);
+ bytes_left -= data_len;
+ if (bytes_left == 0)
+ packet_type = LAST_PACKET;
+ else
+ packet_type = INTER_PACKET;
+ frame = gspca_get_i_frame(gspca_dev);
+ if (frame && !discarding)
+ gspca_frame_add(gspca_dev, packet_type,
+ frame, buffer, data_len);
+ else
+ discarding = 1;
+ }
+ }
+quit_stream:
+ mutex_lock(&gspca_dev->usb_lock);
+ if (gspca_dev->present)
+ sq905c_command(gspca_dev, SQ905C_CLEAR, 0);
+ mutex_unlock(&gspca_dev->usb_lock);
+ kfree(buffer);
+}
+
+/* This function is called at probe time just before sd_init */
+static int sd_config(struct gspca_dev *gspca_dev,
+ const struct usb_device_id *id)
+{
+ struct cam *cam = &gspca_dev->cam;
+ struct sd *dev = (struct sd *) gspca_dev;
+
+ PDEBUG(D_PROBE,
+ "SQ9050 camera detected"
+ " (vid/pid 0x%04X:0x%04X)", id->idVendor, id->idProduct);
+ cam->cam_mode = sq905c_mode;
+ cam->nmodes = 2;
+ if (id->idProduct == 0x9050)
+ cam->nmodes = 1;
+ /* We don't use the buffer gspca allocates so make it small. */
+ cam->bulk_size = 32;
+ INIT_WORK(&dev->work_struct, sq905c_dostream);
+ return 0;
+}
+
+/* called on streamoff with alt==0 and on disconnect */
+/* the usb_lock is held at entry - restore on exit */
+static void sd_stop0(struct gspca_dev *gspca_dev)
+{
+ struct sd *dev = (struct sd *) gspca_dev;
+
+ /* wait for the work queue to terminate */
+ mutex_unlock(&gspca_dev->usb_lock);
+ /* This waits for sq905c_dostream to finish */
+ destroy_workqueue(dev->work_thread);
+ dev->work_thread = NULL;
+ mutex_lock(&gspca_dev->usb_lock);
+}
+
+/* this function is called at probe and resume time */
+static int sd_init(struct gspca_dev *gspca_dev)
+{
+ int ret;
+
+ /* connect to the camera and reset it. */
+ ret = sq905c_command(gspca_dev, SQ905C_CLEAR, 0);
+ return ret;
+}
+
+/* Set up for getting frames. */
+static int sd_start(struct gspca_dev *gspca_dev)
+{
+ struct sd *dev = (struct sd *) gspca_dev;
+ int ret;
+
+ dev->cap_mode = gspca_dev->cam.cam_mode;
+ /* "Open the shutter" and set size, to start capture */
+ switch (gspca_dev->width) {
+ case 640:
+ PDEBUG(D_STREAM, "Start streaming at high resolution");
+ dev->cap_mode++;
+ ret = sq905c_command(gspca_dev, SQ905C_CAPTURE_HI,
+ SQ905C_CAPTURE_INDEX);
+ break;
+ default: /* 320 */
+ PDEBUG(D_STREAM, "Start streaming at medium resolution");
+ ret = sq905c_command(gspca_dev, SQ905C_CAPTURE_MED,
+ SQ905C_CAPTURE_INDEX);
+ }
+
+ if (ret < 0) {
+ PDEBUG(D_ERR, "Start streaming command failed");
+ return ret;
+ }
+ /* Start the workqueue function to do the streaming */
+ dev->work_thread = create_singlethread_workqueue(MODULE_NAME);
+ queue_work(dev->work_thread, &dev->work_struct);
+
+ return 0;
+}
+
+/* Table of supported USB devices */
+static const __devinitdata struct usb_device_id device_table[] = {
+ {USB_DEVICE(0x2770, 0x905c)},
+ {USB_DEVICE(0x2770, 0x9050)},
+ {USB_DEVICE(0x2770, 0x913d)},
+ {}
+};
+
+MODULE_DEVICE_TABLE(usb, device_table);
+
+/* sub-driver description */
+static const struct sd_desc sd_desc = {
+ .name = MODULE_NAME,
+ .config = sd_config,
+ .init = sd_init,
+ .start = sd_start,
+ .stop0 = sd_stop0,
+};
+
+/* -- device connect -- */
+static int sd_probe(struct usb_interface *intf,
+ const struct usb_device_id *id)
+{
+ return gspca_dev_probe(intf, id,
+ &sd_desc,
+ sizeof(struct sd),
+ THIS_MODULE);
+}
+
+static struct usb_driver sd_driver = {
+ .name = MODULE_NAME,
+ .id_table = device_table,
+ .probe = sd_probe,
+ .disconnect = gspca_disconnect,
+#ifdef CONFIG_PM
+ .suspend = gspca_suspend,
+ .resume = gspca_resume,
+#endif
+};
+
+/* -- module insert / remove -- */
+static int __init sd_mod_init(void)
+{
+ int ret;
+
+ ret = usb_register(&sd_driver);
+ if (ret < 0)
+ return ret;
+ PDEBUG(D_PROBE, "registered");
+ return 0;
+}
+
+static void __exit sd_mod_exit(void)
+{
+ usb_deregister(&sd_driver);
+ PDEBUG(D_PROBE, "deregistered");
+}
+
+module_init(sd_mod_init);
+module_exit(sd_mod_exit);
diff -uprN linuxa/include/linux/videodev2.h linuxb/include/linux/videodev2.h
--- linuxa/include/linux/videodev2.h 2009-03-03 13:15:18.000000000 -0600
+++ linuxb/include/linux/videodev2.h 2009-03-03 13:14:19.000000000 -0600
@@ -345,6 +345,7 @@ struct v4l2_pix_format {
#define V4L2_PIX_FMT_SPCA561 v4l2_fourcc('S', '5', '6', '1') /* compressed GBRG bayer */
#define V4L2_PIX_FMT_PAC207 v4l2_fourcc('P', '2', '0', '7') /* compressed BGGR bayer */
#define V4L2_PIX_FMT_MR97310A v4l2_fourcc('M', '3', '1', '0') /* compressed BGGR bayer */
+#define V4L2_PIX_FMT_SQ905C v4l2_fourcc('9', '0', '5', 'C') /* compressed RGGB bayer */
#define V4L2_PIX_FMT_PJPG v4l2_fourcc('P', 'J', 'P', 'G') /* Pixart 73xx JPEG */
#define V4L2_PIX_FMT_YVYU v4l2_fourcc('Y', 'V', 'Y', 'U') /* 16 YVU 4:2:2 */
--
To unsubscribe from this list: send the line "unsubscribe linux-media" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
