diff options
Diffstat (limited to 'drivers/media/usb/gspca/sq905.c')
| -rw-r--r-- | drivers/media/usb/gspca/sq905.c | 439 |
1 files changed, 439 insertions, 0 deletions
diff --git a/drivers/media/usb/gspca/sq905.c b/drivers/media/usb/gspca/sq905.c new file mode 100644 index 0000000..a7ae0ec --- /dev/null +++ b/drivers/media/usb/gspca/sq905.c @@ -0,0 +1,439 @@ +/* + * 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 contributors + * 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 pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#define MODULE_NAME "sq905" + +#include <linux/workqueue.h> +#include <linux/slab.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 */ + +/* Any non-zero value in the bottom 2 bits of the 2nd byte of + * the ID appears to indicate the camera can do 640*480. If the + * LSB of that byte is set the image is just upside down, otherwise + * it is rotated 180 degrees. */ +#define SQ905_HIRES_MASK 0x00000300 +#define SQ905_ORIENTATION_MASK 0x00000100 + +/* 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 */ +#define SQ905_CAPTURE_HIGH 0x62 /* Starts capture at 640x480 (some cams only) */ +/* note that the capture command also controls the output dimensions */ + +/* Structure to hold all of our device specific stuff */ +struct sd { + struct gspca_dev gspca_dev; /* !! must be the first item */ + + /* + * Driver stuff + */ + struct work_struct work_struct; + struct workqueue_struct *work_thread; +}; + +static struct v4l2_pix_format sq905_mode[] = { + { 160, 120, V4L2_PIX_FMT_SBGGR8, V4L2_FIELD_NONE, + .bytesperline = 160, + .sizeimage = 160 * 120, + .colorspace = V4L2_COLORSPACE_SRGB, + .priv = 0}, + { 320, 240, V4L2_PIX_FMT_SBGGR8, V4L2_FIELD_NONE, + .bytesperline = 320, + .sizeimage = 320 * 240, + .colorspace = V4L2_COLORSPACE_SRGB, + .priv = 0}, + { 640, 480, V4L2_PIX_FMT_SBGGR8, V4L2_FIELD_NONE, + .bytesperline = 640, + .sizeimage = 640 * 480, + .colorspace = V4L2_COLORSPACE_SRGB, + .priv = 0} +}; + +/* + * 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) { + pr_err("%s: usb_control_msg failed (%d)\n", __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) { + pr_err("%s: usb_control_msg failed 2 (%d)\n", __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) { + pr_err("%s: usb_control_msg failed (%d)\n", __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 need_lock) +{ + int ret; + int act_len; + + gspca_dev->usb_buf[0] = '\0'; + if (need_lock) + mutex_lock(&gspca_dev->usb_lock); + 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 (need_lock) + mutex_unlock(&gspca_dev->usb_lock); + if (ret < 0) { + pr_err("%s: usb_control_msg failed (%d)\n", __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) { + pr_err("bulk read fail (%d) len %d/%d\n", 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 gspca_dev->usb_buf we take the usb_lock when + * performing USB operations using it. In practice we don't really need this + * as the camera doesn't provide any controls. + */ +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; + 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 packet_type; + int frame_sz; + int ret; + u8 *data; + u8 *buffer; + + buffer = kmalloc(SQ905_MAX_TRANSFER, GFP_KERNEL | GFP_DMA); + if (!buffer) { + pr_err("Couldn't allocate USB buffer\n"); + goto quit_stream; + } + + frame_sz = gspca_dev->cam.cam_mode[gspca_dev->curr_mode].sizeimage + + FRAME_HEADER_LEN; + + while (gspca_dev->present && gspca_dev->streaming) { +#ifdef CONFIG_PM + if (gspca_dev->frozen) + break; +#endif + /* request some data and then read it until we have + * a complete frame. */ + bytes_left = frame_sz; + header_read = 0; + + /* Note we do not check for gspca_dev->streaming here, as + we must finish reading an entire frame, otherwise the + next time we stream we start reading in the middle of a + frame. */ + while (bytes_left > 0 && gspca_dev->present) { + data_len = bytes_left > SQ905_MAX_TRANSFER ? + SQ905_MAX_TRANSFER : bytes_left; + ret = sq905_read_data(gspca_dev, buffer, data_len, 1); + if (ret < 0) + goto quit_stream; + PDEBUG(D_PACK, + "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; + } + gspca_frame_add(gspca_dev, packet_type, + data, data_len); + /* If entire frame fits in one packet we still + need to add a LAST_PACKET */ + if (packet_type == FIRST_PACKET && + bytes_left == 0) + gspca_frame_add(gspca_dev, LAST_PACKET, + NULL, 0); + } + if (gspca_dev->present) { + /* acknowledge the frame */ + mutex_lock(&gspca_dev->usb_lock); + ret = sq905_ack_frame(gspca_dev); + mutex_unlock(&gspca_dev->usb_lock); + if (ret < 0) + goto quit_stream; + } + } +quit_stream: + if (gspca_dev->present) { + mutex_lock(&gspca_dev->usb_lock); + 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; + + /* We don't use the buffer gspca allocates so make it small. */ + cam->bulk = 1; + 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) +{ + 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, 0); + if (ret < 0) + return ret; + /* usb_buf is allocated with kmalloc so is aligned. + * Camera model number is the right way round if we assume this + * reverse engineered ID is supposed to be big endian. */ + ident = be32_to_cpup((__be32 *)gspca_dev->usb_buf); + ret = sq905_command(gspca_dev, SQ905_CLEAR); + if (ret < 0) + return ret; + PDEBUG(D_CONF, "SQ905 camera ID %08x detected", ident); + gspca_dev->cam.cam_mode = sq905_mode; + gspca_dev->cam.nmodes = ARRAY_SIZE(sq905_mode); + if (!(ident & SQ905_HIRES_MASK)) + gspca_dev->cam.nmodes--; + + if (ident & SQ905_ORIENTATION_MASK) + gspca_dev->cam.input_flags = V4L2_IN_ST_VFLIP; + else + gspca_dev->cam.input_flags = V4L2_IN_ST_VFLIP | + V4L2_IN_ST_HFLIP; + 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 */ + switch (gspca_dev->curr_mode) { + default: +/* case 2: */ + PDEBUG(D_STREAM, "Start streaming at high resolution"); + ret = sq905_command(&dev->gspca_dev, SQ905_CAPTURE_HIGH); + break; + case 1: + PDEBUG(D_STREAM, "Start streaming at medium resolution"); + ret = sq905_command(&dev->gspca_dev, SQ905_CAPTURE_MED); + break; + case 0: + PDEBUG(D_STREAM, "Start streaming at low resolution"); + ret = sq905_command(&dev->gspca_dev, SQ905_CAPTURE_LOW); + } + + if (ret < 0) { + PERR("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 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, + .reset_resume = gspca_resume, +#endif +}; + +module_usb_driver(sd_driver); |