drivers/media/usb/gspca/benq.c

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This source file includes following definitions.
reg_w
sd_config
sd_init
sd_start
sd_stopN
sd_pkt_scan
sd_isoc_irq
sd_probe
   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Benq DC E300 subdriver
   4  *
   5  * Copyright (C) 2009 Jean-Francois Moine (http://moinejf.free.fr)
   6  */
   7 
   8 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
   9 
  10 #define MODULE_NAME "benq"
  11 
  12 #include "gspca.h"
  13 
  14 MODULE_AUTHOR("Jean-Francois Moine <http://moinejf.free.fr>");
  15 MODULE_DESCRIPTION("Benq DC E300 USB Camera Driver");
  16 MODULE_LICENSE("GPL");
  17 
  18 /* specific webcam descriptor */
  19 struct sd {
  20         struct gspca_dev gspca_dev;     /* !! must be the first item */
  21 };
  22 
  23 static const struct v4l2_pix_format vga_mode[] = {
  24         {320, 240, V4L2_PIX_FMT_JPEG, V4L2_FIELD_NONE,
  25                 .bytesperline = 320,
  26                 .sizeimage = 320 * 240 * 3 / 8 + 590,
  27                 .colorspace = V4L2_COLORSPACE_JPEG},
  28 };
  29 
  30 static void sd_isoc_irq(struct urb *urb);
  31 
  32 /* -- write a register -- */
  33 static void reg_w(struct gspca_dev *gspca_dev,
  34                         u16 value, u16 index)
  35 {
  36         struct usb_device *dev = gspca_dev->dev;
  37         int ret;
  38 
  39         if (gspca_dev->usb_err < 0)
  40                 return;
  41         ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
  42                         0x02,
  43                         USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
  44                         value,
  45                         index,
  46                         NULL,
  47                         0,
  48                         500);
  49         if (ret < 0) {
  50                 pr_err("reg_w err %d\n", ret);
  51                 gspca_dev->usb_err = ret;
  52         }
  53 }
  54 
  55 /* this function is called at probe time */
  56 static int sd_config(struct gspca_dev *gspca_dev,
  57                         const struct usb_device_id *id)
  58 {
  59         gspca_dev->cam.cam_mode = vga_mode;
  60         gspca_dev->cam.nmodes = ARRAY_SIZE(vga_mode);
  61         gspca_dev->cam.no_urb_create = 1;
  62         return 0;
  63 }
  64 
  65 /* this function is called at probe and resume time */
  66 static int sd_init(struct gspca_dev *gspca_dev)
  67 {
  68         return 0;
  69 }
  70 
  71 /* -- start the camera -- */
  72 static int sd_start(struct gspca_dev *gspca_dev)
  73 {
  74         struct urb *urb;
  75         int i, n;
  76 
  77         /* create 4 URBs - 2 on endpoint 0x83 and 2 on 0x082 */
  78 #if MAX_NURBS < 4
  79 #error "Not enough URBs in the gspca table"
  80 #endif
  81 #define SD_PKT_SZ 64
  82 #define SD_NPKT 32
  83         for (n = 0; n < 4; n++) {
  84                 urb = usb_alloc_urb(SD_NPKT, GFP_KERNEL);
  85                 if (!urb)
  86                         return -ENOMEM;
  87                 gspca_dev->urb[n] = urb;
  88                 urb->transfer_buffer = usb_alloc_coherent(gspca_dev->dev,
  89                                                 SD_PKT_SZ * SD_NPKT,
  90                                                 GFP_KERNEL,
  91                                                 &urb->transfer_dma);
  92 
  93                 if (urb->transfer_buffer == NULL) {
  94                         pr_err("usb_alloc_coherent failed\n");
  95                         return -ENOMEM;
  96                 }
  97                 urb->dev = gspca_dev->dev;
  98                 urb->context = gspca_dev;
  99                 urb->transfer_buffer_length = SD_PKT_SZ * SD_NPKT;
 100                 urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
 101                                         n & 1 ? 0x82 : 0x83);
 102                 urb->transfer_flags = URB_ISO_ASAP
 103                                         | URB_NO_TRANSFER_DMA_MAP;
 104                 urb->interval = 1;
 105                 urb->complete = sd_isoc_irq;
 106                 urb->number_of_packets = SD_NPKT;
 107                 for (i = 0; i < SD_NPKT; i++) {
 108                         urb->iso_frame_desc[i].length = SD_PKT_SZ;
 109                         urb->iso_frame_desc[i].offset = SD_PKT_SZ * i;
 110                 }
 111         }
 112 
 113         return gspca_dev->usb_err;
 114 }
 115 
 116 static void sd_stopN(struct gspca_dev *gspca_dev)
 117 {
 118         struct usb_interface *intf;
 119 
 120         reg_w(gspca_dev, 0x003c, 0x0003);
 121         reg_w(gspca_dev, 0x003c, 0x0004);
 122         reg_w(gspca_dev, 0x003c, 0x0005);
 123         reg_w(gspca_dev, 0x003c, 0x0006);
 124         reg_w(gspca_dev, 0x003c, 0x0007);
 125 
 126         intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
 127         usb_set_interface(gspca_dev->dev, gspca_dev->iface,
 128                                         intf->num_altsetting - 1);
 129 }
 130 
 131 static void sd_pkt_scan(struct gspca_dev *gspca_dev,
 132                         u8 *data,               /* isoc packet */
 133                         int len)                /* iso packet length */
 134 {
 135         /* unused */
 136 }
 137 
 138 /* reception of an URB */
 139 static void sd_isoc_irq(struct urb *urb)
 140 {
 141         struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
 142         struct urb *urb0;
 143         u8 *data;
 144         int i, st;
 145 
 146         gspca_dbg(gspca_dev, D_PACK, "sd isoc irq\n");
 147         if (!gspca_dev->streaming)
 148                 return;
 149         if (urb->status != 0) {
 150                 if (urb->status == -ESHUTDOWN)
 151                         return;         /* disconnection */
 152 #ifdef CONFIG_PM
 153                 if (gspca_dev->frozen)
 154                         return;
 155 #endif
 156                 pr_err("urb status: %d\n", urb->status);
 157                 return;
 158         }
 159 
 160         /* if this is a control URN (ep 0x83), wait */
 161         if (urb == gspca_dev->urb[0] || urb == gspca_dev->urb[2])
 162                 return;
 163 
 164         /* scan both received URBs */
 165         if (urb == gspca_dev->urb[1])
 166                 urb0 = gspca_dev->urb[0];
 167         else
 168                 urb0 = gspca_dev->urb[2];
 169         for (i = 0; i < urb->number_of_packets; i++) {
 170 
 171                 /* check the packet status and length */
 172                 if (urb0->iso_frame_desc[i].actual_length != SD_PKT_SZ
 173                     || urb->iso_frame_desc[i].actual_length != SD_PKT_SZ) {
 174                         gspca_err(gspca_dev, "ISOC bad lengths %d / %d\n",
 175                                   urb0->iso_frame_desc[i].actual_length,
 176                                   urb->iso_frame_desc[i].actual_length);
 177                         gspca_dev->last_packet_type = DISCARD_PACKET;
 178                         continue;
 179                 }
 180                 st = urb0->iso_frame_desc[i].status;
 181                 if (st == 0)
 182                         st = urb->iso_frame_desc[i].status;
 183                 if (st) {
 184                         pr_err("ISOC data error: [%d] status=%d\n",
 185                                 i, st);
 186                         gspca_dev->last_packet_type = DISCARD_PACKET;
 187                         continue;
 188                 }
 189 
 190                 /*
 191                  * The images are received in URBs of different endpoints
 192                  * (0x83 and 0x82).
 193                  * Image pieces in URBs of ep 0x83 are continuated in URBs of
 194                  * ep 0x82 of the same index.
 195                  * The packets in the URBs of endpoint 0x83 start with:
 196                  *      - 80 ba/bb 00 00 = start of image followed by 'ff d8'
 197                  *      - 04 ba/bb oo oo = image piece
 198                  *              where 'oo oo' is the image offset
 199                                                 (not checked)
 200                  *      - (other -> bad frame)
 201                  * The images are JPEG encoded with full header and
 202                  * normal ff escape.
 203                  * The end of image ('ff d9') may occur in any URB.
 204                  * (not checked)
 205                  */
 206                 data = (u8 *) urb0->transfer_buffer
 207                                         + urb0->iso_frame_desc[i].offset;
 208                 if (data[0] == 0x80 && (data[1] & 0xfe) == 0xba) {
 209 
 210                         /* new image */
 211                         gspca_frame_add(gspca_dev, LAST_PACKET,
 212                                         NULL, 0);
 213                         gspca_frame_add(gspca_dev, FIRST_PACKET,
 214                                         data + 4, SD_PKT_SZ - 4);
 215                 } else if (data[0] == 0x04 && (data[1] & 0xfe) == 0xba) {
 216                         gspca_frame_add(gspca_dev, INTER_PACKET,
 217                                         data + 4, SD_PKT_SZ - 4);
 218                 } else {
 219                         gspca_dev->last_packet_type = DISCARD_PACKET;
 220                         continue;
 221                 }
 222                 data = (u8 *) urb->transfer_buffer
 223                                         + urb->iso_frame_desc[i].offset;
 224                 gspca_frame_add(gspca_dev, INTER_PACKET,
 225                                 data, SD_PKT_SZ);
 226         }
 227 
 228         /* resubmit the URBs */
 229         st = usb_submit_urb(urb0, GFP_ATOMIC);
 230         if (st < 0)
 231                 pr_err("usb_submit_urb(0) ret %d\n", st);
 232         st = usb_submit_urb(urb, GFP_ATOMIC);
 233         if (st < 0)
 234                 pr_err("usb_submit_urb() ret %d\n", st);
 235 }
 236 
 237 /* sub-driver description */
 238 static const struct sd_desc sd_desc = {
 239         .name = MODULE_NAME,
 240         .config = sd_config,
 241         .init = sd_init,
 242         .start = sd_start,
 243         .stopN = sd_stopN,
 244         .pkt_scan = sd_pkt_scan,
 245 };
 246 
 247 /* -- module initialisation -- */
 248 static const struct usb_device_id device_table[] = {
 249         {USB_DEVICE(0x04a5, 0x3035)},
 250         {}
 251 };
 252 MODULE_DEVICE_TABLE(usb, device_table);
 253 
 254 /* -- device connect -- */
 255 static int sd_probe(struct usb_interface *intf,
 256                         const struct usb_device_id *id)
 257 {
 258         return gspca_dev_probe(intf, id, &sd_desc, sizeof(struct sd),
 259                                 THIS_MODULE);
 260 }
 261 
 262 static struct usb_driver sd_driver = {
 263         .name = MODULE_NAME,
 264         .id_table = device_table,
 265         .probe = sd_probe,
 266         .disconnect = gspca_disconnect,
 267 #ifdef CONFIG_PM
 268         .suspend = gspca_suspend,
 269         .resume = gspca_resume,
 270         .reset_resume = gspca_resume,
 271 #endif
 272 };
 273 
 274 module_usb_driver(sd_driver);
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/media/usb/gspca/benq.c

DEFINITIONS
