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); 275