--- /dev/null
+/*
+ * 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@auburn.edu>");
+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);
projects / linux-2.6-omap-h63xx.git / commitdiff