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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Benq DC E300 subdriver4 *5 * Copyright (C) 2009 Jean-Francois Moine (http://moinejf.free.fr)6 */7 8#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt9 10#define MODULE_NAME "benq"11 12#include "gspca.h"13 14MODULE_AUTHOR("Jean-Francois Moine <http://moinejf.free.fr>");15MODULE_DESCRIPTION("Benq DC E300 USB Camera Driver");16MODULE_LICENSE("GPL");17 18/* specific webcam descriptor */19struct sd {20 struct gspca_dev gspca_dev; /* !! must be the first item */21};22 23static 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 30static void sd_isoc_irq(struct urb *urb);31 32/* -- write a register -- */33static 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 */56static 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 */66static int sd_init(struct gspca_dev *gspca_dev)67{68 return 0;69}70 71/* -- start the camera -- */72static 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 < 479#error "Not enough URBs in the gspca table"80#endif81#define SD_PKT_SZ 6482#define SD_NPKT 3283 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_ASAP103 | 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 116static 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 131static 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 */139static 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_PM153 if (gspca_dev->frozen)154 return;155#endif156 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 else168 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_SZ173 || 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 endpoints192 * (0x83 and 0x82).193 * Image pieces in URBs of ep 0x83 are continuated in URBs of194 * 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 piece198 * where 'oo oo' is the image offset199 (not checked)200 * - (other -> bad frame)201 * The images are JPEG encoded with full header and202 * normal ff escape.203 * The end of image ('ff d9') may occur in any URB.204 * (not checked)205 */206 data = (u8 *) urb0->transfer_buffer207 + 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_buffer223 + 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 */238static 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 -- */248static const struct usb_device_id device_table[] = {249 {USB_DEVICE(0x04a5, 0x3035)},250 {}251};252MODULE_DEVICE_TABLE(usb, device_table);253 254/* -- device connect -- */255static 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 262static 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_PM268 .suspend = gspca_suspend,269 .resume = gspca_resume,270 .reset_resume = gspca_resume,271#endif272};273 274module_usb_driver(sd_driver);275