| /* |
| * 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 pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| |
| #define MODULE_NAME "sq905c" |
| |
| #include <linux/workqueue.h> |
| #include <linux/slab.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_GET_ID 0x14f4 /* Read version number */ |
| #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) { |
| pr_err("%s: usb_control_msg failed (%d)\n", __func__, ret); |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| static int sq905c_read(struct gspca_dev *gspca_dev, u16 command, u16 index, |
| int size) |
| { |
| int ret; |
| |
| ret = usb_control_msg(gspca_dev->dev, |
| usb_rcvctrlpipe(gspca_dev->dev, 0), |
| USB_REQ_SYNCH_FRAME, /* request */ |
| USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE, |
| command, index, gspca_dev->usb_buf, size, |
| SQ905C_CMD_TIMEOUT); |
| if (ret < 0) { |
| pr_err("%s: usb_control_msg failed (%d)\n", __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; |
| int bytes_left; /* bytes remaining in current frame. */ |
| int data_len; /* size to use for the next read. */ |
| int act_len; |
| int packet_type; |
| int ret; |
| u8 *buffer; |
| |
| buffer = kmalloc(SQ905C_MAX_TRANSFER, GFP_KERNEL | GFP_DMA); |
| if (!buffer) { |
| pr_err("Couldn't allocate USB buffer\n"); |
| goto quit_stream; |
| } |
| |
| while (!gspca_dev->frozen && gspca_dev->dev && gspca_dev->streaming) { |
| /* 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; |
| gspca_frame_add(gspca_dev, packet_type, |
| buffer, FRAME_HEADER_LEN); |
| while (bytes_left > 0 && gspca_dev->dev) { |
| data_len = bytes_left > SQ905C_MAX_TRANSFER ? |
| SQ905C_MAX_TRANSFER : bytes_left; |
| 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; |
| gspca_frame_add(gspca_dev, packet_type, |
| buffer, data_len); |
| } |
| } |
| quit_stream: |
| if (gspca_dev->dev) { |
| mutex_lock(&gspca_dev->usb_lock); |
| 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; |
| int ret; |
| |
| PDEBUG(D_PROBE, |
| "SQ9050 camera detected" |
| " (vid/pid 0x%04X:0x%04X)", id->idVendor, id->idProduct); |
| |
| ret = sq905c_command(gspca_dev, SQ905C_GET_ID, 0); |
| if (ret < 0) { |
| PDEBUG(D_ERR, "Get version command failed"); |
| return ret; |
| } |
| |
| ret = sq905c_read(gspca_dev, 0xf5, 0, 20); |
| if (ret < 0) { |
| PDEBUG(D_ERR, "Reading version command failed"); |
| return ret; |
| } |
| /* Note we leave out the usb id and the manufacturing date */ |
| PDEBUG(D_PROBE, |
| "SQ9050 ID string: %02x - %02x %02x %02x %02x %02x %02x", |
| gspca_dev->usb_buf[3], |
| gspca_dev->usb_buf[14], gspca_dev->usb_buf[15], |
| gspca_dev->usb_buf[16], gspca_dev->usb_buf[17], |
| gspca_dev->usb_buf[18], gspca_dev->usb_buf[19]); |
| |
| cam->cam_mode = sq905c_mode; |
| cam->nmodes = 2; |
| if (gspca_dev->usb_buf[15] == 0) |
| cam->nmodes = 1; |
| /* We don't use the buffer gspca allocates so make it small. */ |
| cam->bulk_size = 32; |
| cam->bulk = 1; |
| 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 struct usb_device_id device_table[] = { |
| {USB_DEVICE(0x2770, 0x905c)}, |
| {USB_DEVICE(0x2770, 0x9050)}, |
| {USB_DEVICE(0x2770, 0x9051)}, |
| {USB_DEVICE(0x2770, 0x9052)}, |
| {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_usb_driver(sd_driver); |