diff options
Diffstat (limited to 'drivers/media/video/gspca/sq905c.c')
| -rw-r--r-- | drivers/media/video/gspca/sq905c.c | 328 |
1 files changed, 328 insertions, 0 deletions
diff --git a/drivers/media/video/gspca/sq905c.c b/drivers/media/video/gspca/sq905c.c new file mode 100644 index 000000000000..0bcb74a1b143 --- /dev/null +++ b/drivers/media/video/gspca/sq905c.c @@ -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@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); |