275 lines
6.7 KiB
C
275 lines
6.7 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Benq DC E300 subdriver
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*
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* Copyright (C) 2009 Jean-Francois Moine (http://moinejf.free.fr)
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#define MODULE_NAME "benq"
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#include "gspca.h"
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MODULE_AUTHOR("Jean-Francois Moine <http://moinejf.free.fr>");
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MODULE_DESCRIPTION("Benq DC E300 USB Camera Driver");
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MODULE_LICENSE("GPL");
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/* specific webcam descriptor */
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struct sd {
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struct gspca_dev gspca_dev; /* !! must be the first item */
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};
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static const struct v4l2_pix_format vga_mode[] = {
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{320, 240, V4L2_PIX_FMT_JPEG, V4L2_FIELD_NONE,
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.bytesperline = 320,
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.sizeimage = 320 * 240 * 3 / 8 + 590,
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.colorspace = V4L2_COLORSPACE_JPEG},
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};
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static void sd_isoc_irq(struct urb *urb);
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/* -- write a register -- */
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static void reg_w(struct gspca_dev *gspca_dev,
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u16 value, u16 index)
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{
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struct usb_device *dev = gspca_dev->dev;
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int ret;
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if (gspca_dev->usb_err < 0)
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return;
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ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
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0x02,
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USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
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value,
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index,
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NULL,
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0,
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500);
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if (ret < 0) {
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pr_err("reg_w err %d\n", ret);
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gspca_dev->usb_err = ret;
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}
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}
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/* this function is called at probe time */
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static int sd_config(struct gspca_dev *gspca_dev,
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const struct usb_device_id *id)
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{
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gspca_dev->cam.cam_mode = vga_mode;
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gspca_dev->cam.nmodes = ARRAY_SIZE(vga_mode);
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gspca_dev->cam.no_urb_create = 1;
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return 0;
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}
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/* this function is called at probe and resume time */
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static int sd_init(struct gspca_dev *gspca_dev)
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{
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return 0;
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}
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/* -- start the camera -- */
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static int sd_start(struct gspca_dev *gspca_dev)
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{
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struct urb *urb;
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int i, n;
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/* create 4 URBs - 2 on endpoint 0x83 and 2 on 0x082 */
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#if MAX_NURBS < 4
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#error "Not enough URBs in the gspca table"
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#endif
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#define SD_PKT_SZ 64
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#define SD_NPKT 32
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for (n = 0; n < 4; n++) {
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urb = usb_alloc_urb(SD_NPKT, GFP_KERNEL);
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if (!urb)
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return -ENOMEM;
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gspca_dev->urb[n] = urb;
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urb->transfer_buffer = usb_alloc_coherent(gspca_dev->dev,
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SD_PKT_SZ * SD_NPKT,
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GFP_KERNEL,
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&urb->transfer_dma);
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if (urb->transfer_buffer == NULL) {
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pr_err("usb_alloc_coherent failed\n");
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return -ENOMEM;
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}
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urb->dev = gspca_dev->dev;
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urb->context = gspca_dev;
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urb->transfer_buffer_length = SD_PKT_SZ * SD_NPKT;
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urb->pipe = usb_rcvisocpipe(gspca_dev->dev,
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n & 1 ? 0x82 : 0x83);
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urb->transfer_flags = URB_ISO_ASAP
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| URB_NO_TRANSFER_DMA_MAP;
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urb->interval = 1;
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urb->complete = sd_isoc_irq;
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urb->number_of_packets = SD_NPKT;
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for (i = 0; i < SD_NPKT; i++) {
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urb->iso_frame_desc[i].length = SD_PKT_SZ;
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urb->iso_frame_desc[i].offset = SD_PKT_SZ * i;
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}
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}
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return gspca_dev->usb_err;
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}
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static void sd_stopN(struct gspca_dev *gspca_dev)
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{
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struct usb_interface *intf;
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reg_w(gspca_dev, 0x003c, 0x0003);
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reg_w(gspca_dev, 0x003c, 0x0004);
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reg_w(gspca_dev, 0x003c, 0x0005);
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reg_w(gspca_dev, 0x003c, 0x0006);
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reg_w(gspca_dev, 0x003c, 0x0007);
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intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface);
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usb_set_interface(gspca_dev->dev, gspca_dev->iface,
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intf->num_altsetting - 1);
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}
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static void sd_pkt_scan(struct gspca_dev *gspca_dev,
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u8 *data, /* isoc packet */
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int len) /* iso packet length */
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{
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/* unused */
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}
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/* reception of an URB */
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static void sd_isoc_irq(struct urb *urb)
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{
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struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
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struct urb *urb0;
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u8 *data;
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int i, st;
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gspca_dbg(gspca_dev, D_PACK, "sd isoc irq\n");
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if (!gspca_dev->streaming)
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return;
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if (urb->status != 0) {
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if (urb->status == -ESHUTDOWN)
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return; /* disconnection */
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#ifdef CONFIG_PM
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if (gspca_dev->frozen)
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return;
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#endif
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pr_err("urb status: %d\n", urb->status);
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return;
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}
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/* if this is a control URN (ep 0x83), wait */
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if (urb == gspca_dev->urb[0] || urb == gspca_dev->urb[2])
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return;
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/* scan both received URBs */
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if (urb == gspca_dev->urb[1])
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urb0 = gspca_dev->urb[0];
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else
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urb0 = gspca_dev->urb[2];
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for (i = 0; i < urb->number_of_packets; i++) {
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/* check the packet status and length */
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if (urb0->iso_frame_desc[i].actual_length != SD_PKT_SZ
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|| urb->iso_frame_desc[i].actual_length != SD_PKT_SZ) {
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gspca_err(gspca_dev, "ISOC bad lengths %d / %d\n",
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urb0->iso_frame_desc[i].actual_length,
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urb->iso_frame_desc[i].actual_length);
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gspca_dev->last_packet_type = DISCARD_PACKET;
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continue;
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}
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st = urb0->iso_frame_desc[i].status;
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if (st == 0)
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st = urb->iso_frame_desc[i].status;
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if (st) {
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pr_err("ISOC data error: [%d] status=%d\n",
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i, st);
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gspca_dev->last_packet_type = DISCARD_PACKET;
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continue;
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}
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/*
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* The images are received in URBs of different endpoints
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* (0x83 and 0x82).
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* Image pieces in URBs of ep 0x83 are continuated in URBs of
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* ep 0x82 of the same index.
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* The packets in the URBs of endpoint 0x83 start with:
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* - 80 ba/bb 00 00 = start of image followed by 'ff d8'
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* - 04 ba/bb oo oo = image piece
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* where 'oo oo' is the image offset
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(not checked)
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* - (other -> bad frame)
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* The images are JPEG encoded with full header and
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* normal ff escape.
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* The end of image ('ff d9') may occur in any URB.
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* (not checked)
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*/
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data = (u8 *) urb0->transfer_buffer
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+ urb0->iso_frame_desc[i].offset;
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if (data[0] == 0x80 && (data[1] & 0xfe) == 0xba) {
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/* new image */
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gspca_frame_add(gspca_dev, LAST_PACKET,
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NULL, 0);
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gspca_frame_add(gspca_dev, FIRST_PACKET,
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data + 4, SD_PKT_SZ - 4);
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} else if (data[0] == 0x04 && (data[1] & 0xfe) == 0xba) {
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gspca_frame_add(gspca_dev, INTER_PACKET,
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data + 4, SD_PKT_SZ - 4);
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} else {
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gspca_dev->last_packet_type = DISCARD_PACKET;
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continue;
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}
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data = (u8 *) urb->transfer_buffer
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+ urb->iso_frame_desc[i].offset;
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gspca_frame_add(gspca_dev, INTER_PACKET,
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data, SD_PKT_SZ);
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}
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/* resubmit the URBs */
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st = usb_submit_urb(urb0, GFP_ATOMIC);
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if (st < 0)
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pr_err("usb_submit_urb(0) ret %d\n", st);
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st = usb_submit_urb(urb, GFP_ATOMIC);
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if (st < 0)
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pr_err("usb_submit_urb() ret %d\n", st);
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}
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/* sub-driver description */
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static const struct sd_desc sd_desc = {
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.name = MODULE_NAME,
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.config = sd_config,
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.init = sd_init,
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.start = sd_start,
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.stopN = sd_stopN,
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.pkt_scan = sd_pkt_scan,
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};
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/* -- module initialisation -- */
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static const struct usb_device_id device_table[] = {
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{USB_DEVICE(0x04a5, 0x3035)},
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{}
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};
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MODULE_DEVICE_TABLE(usb, device_table);
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/* -- device connect -- */
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static int sd_probe(struct usb_interface *intf,
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const struct usb_device_id *id)
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{
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return gspca_dev_probe(intf, id, &sd_desc, sizeof(struct sd),
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THIS_MODULE);
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}
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static struct usb_driver sd_driver = {
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.name = MODULE_NAME,
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.id_table = device_table,
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.probe = sd_probe,
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.disconnect = gspca_disconnect,
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#ifdef CONFIG_PM
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.suspend = gspca_suspend,
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.resume = gspca_resume,
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.reset_resume = gspca_resume,
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#endif
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};
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module_usb_driver(sd_driver);
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