--- /dev/null
+/*
+ * SQ905 subdriver
+ *
+ * Copyright (C) 2008, 2009 Adam Baker and 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
+ */
+
+/*
+ * History and Acknowledgments
+ *
+ * The original Linux driver for SQ905 based cameras was written by
+ * Marcell Lengyel and furter developed by many other contributers
+ * and is available from http://sourceforge.net/projects/sqcam/
+ *
+ * This driver takes advantage of the reverse engineering work done for
+ * that driver and for libgphoto2 but shares no code with them.
+ *
+ * This driver has used as a base the finepix driver and other gspca
+ * based drivers and may still contain code fragments taken from those
+ * drivers.
+ */
+
+#define MODULE_NAME "sq905"
+
+#include <linux/workqueue.h>
+#include "gspca.h"
+
+MODULE_AUTHOR("Adam Baker <linux@baker-net.org.uk>, "
+ "Theodore Kilgore <kilgota@auburn.edu>");
+MODULE_DESCRIPTION("GSPCA/SQ905 USB Camera Driver");
+MODULE_LICENSE("GPL");
+
+/* Default timeouts, in ms */
+#define SQ905_CMD_TIMEOUT 500
+#define SQ905_DATA_TIMEOUT 1000
+
+/* Maximum transfer size to use. */
+#define SQ905_MAX_TRANSFER 0x8000
+#define FRAME_HEADER_LEN 64
+
+/* The known modes, or registers. These go in the "value" slot. */
+
+/* 00 is "none" obviously */
+
+#define SQ905_BULK_READ 0x03 /* precedes any bulk read */
+#define SQ905_COMMAND 0x06 /* precedes the command codes below */
+#define SQ905_PING 0x07 /* when reading an "idling" command */
+#define SQ905_READ_DONE 0xc0 /* ack bulk read completed */
+
+/* Some command codes. These go in the "index" slot. */
+
+#define SQ905_ID 0xf0 /* asks for model string */
+#define SQ905_CONFIG 0x20 /* gets photo alloc. table, not used here */
+#define SQ905_DATA 0x30 /* accesses photo data, not used here */
+#define SQ905_CLEAR 0xa0 /* clear everything */
+#define SQ905_CAPTURE_LOW 0x60 /* Starts capture at 160x120 */
+#define SQ905_CAPTURE_MED 0x61 /* Starts capture at 320x240 */
+/* note that the capture command also controls the output dimensions */
+/* 0x60 -> 160x120, 0x61 -> 320x240 0x62 -> 640x480 depends on camera */
+/* 0x62 is not correct, at least for some cams. Should be 0x63 ? */
+
+/* Structure to hold all of our device specific stuff */
+struct sd {
+ struct gspca_dev gspca_dev; /* !! must be the first item */
+
+ u8 cam_type;
+
+ /*
+ * Driver stuff
+ */
+ struct work_struct work_struct;
+ struct workqueue_struct *work_thread;
+};
+
+/* The driver only supports 320x240 so far. */
+static struct v4l2_pix_format sq905_mode[1] = {
+ { 320, 240, V4L2_PIX_FMT_SBGGR8, V4L2_FIELD_NONE,
+ .bytesperline = 320,
+ .sizeimage = 320 * 240,
+ .colorspace = V4L2_COLORSPACE_SRGB,
+ .priv = 0}
+};
+
+struct cam_type {
+ u32 ident_word;
+ char *name;
+ struct v4l2_pix_format *min_mode;
+ u8 num_modes;
+ u8 sensor_flags;
+};
+
+#define SQ905_FLIP_HORIZ (1 << 0)
+#define SQ905_FLIP_VERT (1 << 1)
+
+/* Last entry is default if nothing else matches */
+static struct cam_type cam_types[] = {
+ { 0x19010509, "PocketCam", &sq905_mode[0], 1, SQ905_FLIP_HORIZ },
+ { 0x32010509, "Magpix", &sq905_mode[0], 1, SQ905_FLIP_HORIZ },
+ { 0, "Default", &sq905_mode[0], 1, SQ905_FLIP_HORIZ | SQ905_FLIP_VERT }
+};
+
+/*
+ * Send a command to the camera.
+ */
+static int sq905_command(struct gspca_dev *gspca_dev, u16 index)
+{
+ int ret;
+
+ gspca_dev->usb_buf[0] = '\0';
+ 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,
+ SQ905_COMMAND, index, gspca_dev->usb_buf, 1,
+ SQ905_CMD_TIMEOUT);
+ if (ret < 0) {
+ PDEBUG(D_ERR, "%s: usb_control_msg failed (%d)",
+ __func__, ret);
+ return ret;
+ }
+
+ ret = usb_control_msg(gspca_dev->dev,
+ usb_sndctrlpipe(gspca_dev->dev, 0),
+ USB_REQ_SYNCH_FRAME, /* request */
+ USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
+ SQ905_PING, 0, gspca_dev->usb_buf, 1,
+ SQ905_CMD_TIMEOUT);
+ if (ret < 0) {
+ PDEBUG(D_ERR, "%s: usb_control_msg failed 2 (%d)",
+ __func__, ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+/*
+ * Acknowledge the end of a frame - see warning on sq905_command.
+ */
+static int sq905_ack_frame(struct gspca_dev *gspca_dev)
+{
+ int ret;
+
+ gspca_dev->usb_buf[0] = '\0';
+ 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,
+ SQ905_READ_DONE, 0, gspca_dev->usb_buf, 1,
+ SQ905_CMD_TIMEOUT);
+ if (ret < 0) {
+ PDEBUG(D_ERR, "%s: usb_control_msg failed (%d)", __func__, ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+/*
+ * request and read a block of data - see warning on sq905_command.
+ */
+static int
+sq905_read_data(struct gspca_dev *gspca_dev, u8 *data, int size)
+{
+ int ret;
+ int act_len;
+
+ gspca_dev->usb_buf[0] = '\0';
+ 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,
+ SQ905_BULK_READ, size, gspca_dev->usb_buf,
+ 1, SQ905_CMD_TIMEOUT);
+ if (ret < 0) {
+ PDEBUG(D_ERR, "%s: usb_control_msg failed (%d)", __func__, ret);
+ return ret;
+ }
+ ret = usb_bulk_msg(gspca_dev->dev,
+ usb_rcvbulkpipe(gspca_dev->dev, 0x81),
+ data, size, &act_len, SQ905_DATA_TIMEOUT);
+
+ /* successful, it returns 0, otherwise negative */
+ if (ret < 0 || act_len != size) {
+ PDEBUG(D_ERR, "bulk read fail (%d) len %d/%d",
+ ret, act_len, size);
+ return -EIO;
+ }
+ 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 we take the gspca
+ * usb_lock when performing USB operations. In practice the only thing we need
+ * to protect against is the usb_set_interface call that gspca makes during
+ * stream_off as the camera doesn't provide any controls that the user could try
+ * to change.
+ */
+static void sq905_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 header_read; /* true if we have already read the frame header. */
+ int discarding; /* true if we failed to get space for frame. */
+ int packet_type;
+ int ret;
+ u8 *data;
+ u8 *buffer;
+
+ buffer = kmalloc(SQ905_MAX_TRANSFER, GFP_KERNEL | GFP_DMA);
+ mutex_lock(&gspca_dev->usb_lock);
+ if (!buffer) {
+ PDEBUG(D_ERR, "Couldn't allocate USB buffer");
+ goto quit_stream;
+ }
+
+ while (gspca_dev->present && gspca_dev->streaming) {
+ /* Need a short delay to ensure streaming flag was set by
+ * gspca and to make sure gspca can grab the mutex. */
+ mutex_unlock(&gspca_dev->usb_lock);
+ msleep(1);
+
+ /* request some data and then read it until we have
+ * a complete frame. */
+ bytes_left = sq905_mode[0].sizeimage + FRAME_HEADER_LEN;
+ header_read = 0;
+ discarding = 0;
+
+ while (bytes_left > 0) {
+ data_len = bytes_left > SQ905_MAX_TRANSFER ?
+ SQ905_MAX_TRANSFER : bytes_left;
+ mutex_lock(&gspca_dev->usb_lock);
+ if (!gspca_dev->present)
+ goto quit_stream;
+ ret = sq905_read_data(gspca_dev, buffer, data_len);
+ if (ret < 0)
+ goto quit_stream;
+ mutex_unlock(&gspca_dev->usb_lock);
+ PDEBUG(D_STREAM,
+ "Got %d bytes out of %d for frame",
+ data_len, bytes_left);
+ bytes_left -= data_len;
+ data = buffer;
+ if (!header_read) {
+ packet_type = FIRST_PACKET;
+ /* The first 64 bytes of each frame are
+ * a header full of FF 00 bytes */
+ data += FRAME_HEADER_LEN;
+ data_len -= FRAME_HEADER_LEN;
+ header_read = 1;
+ } else 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, data, data_len);
+ else
+ discarding = 1;
+ }
+ /* acknowledge the frame */
+ mutex_lock(&gspca_dev->usb_lock);
+ if (!gspca_dev->present)
+ goto quit_stream;
+ ret = sq905_ack_frame(gspca_dev);
+ if (ret < 0)
+ goto quit_stream;
+ }
+quit_stream:
+ /* the usb_lock is already acquired */
+ if (gspca_dev->present)
+ sq905_command(gspca_dev, SQ905_CLEAR);
+ 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;
+
+ cam->cam_mode = sq905_mode;
+ cam->nmodes = 1;
+ /* We don't use the buffer gspca allocates so make it small. */
+ cam->bulk_size = 64;
+
+ INIT_WORK(&dev->work_struct, sq905_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 sq905_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)
+{
+ struct sd *dev = (struct sd *) gspca_dev;
+ u32 ident;
+ int ret;
+
+ /* connect to the camera and read
+ * the model ID and process that and put it away.
+ */
+ ret = sq905_command(gspca_dev, SQ905_CLEAR);
+ if (ret < 0)
+ return ret;
+ ret = sq905_command(gspca_dev, SQ905_ID);
+ if (ret < 0)
+ return ret;
+ ret = sq905_read_data(gspca_dev, gspca_dev->usb_buf, 4);
+ if (ret < 0)
+ return ret;
+ /* usb_buf is allocated with kmalloc so is aligned. */
+ ident = le32_to_cpup((u32 *)gspca_dev->usb_buf);
+ ret = sq905_command(gspca_dev, SQ905_CLEAR);
+ if (ret < 0)
+ return ret;
+ dev->cam_type = 0;
+ while (dev->cam_type < ARRAY_SIZE(cam_types) - 1 &&
+ ident != cam_types[dev->cam_type].ident_word)
+ dev->cam_type++;
+ PDEBUG(D_CONF, "SQ905 camera %s, ID %08x detected",
+ cam_types[dev->cam_type].name, ident);
+ return 0;
+}
+
+/* Set up for getting frames. */
+static int sd_start(struct gspca_dev *gspca_dev)
+{
+ struct sd *dev = (struct sd *) gspca_dev;
+ int ret;
+
+ /* "Open the shutter" and set size, to start capture */
+ ret = sq905_command(&dev->gspca_dev, SQ905_CAPTURE_MED);
+ 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, 0x9120)},
+ {}
+};
+
+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);
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