diff options
Diffstat (limited to 'drivers/media/usb/gspca/benq.c')
| -rw-r--r-- | drivers/media/usb/gspca/benq.c | 274 |
1 files changed, 274 insertions, 0 deletions
diff --git a/drivers/media/usb/gspca/benq.c b/drivers/media/usb/gspca/benq.c new file mode 100644 index 0000000000..25c40fb1ba --- /dev/null +++ b/drivers/media/usb/gspca/benq.c @@ -0,0 +1,274 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Benq DC E300 subdriver + * + * Copyright (C) 2009 Jean-Francois Moine (http://moinejf.free.fr) + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#define MODULE_NAME "benq" + +#include "gspca.h" + +MODULE_AUTHOR("Jean-Francois Moine <http://moinejf.free.fr>"); +MODULE_DESCRIPTION("Benq DC E300 USB Camera Driver"); +MODULE_LICENSE("GPL"); + +/* specific webcam descriptor */ +struct sd { + struct gspca_dev gspca_dev; /* !! must be the first item */ +}; + +static const struct v4l2_pix_format vga_mode[] = { + {320, 240, V4L2_PIX_FMT_JPEG, V4L2_FIELD_NONE, + .bytesperline = 320, + .sizeimage = 320 * 240 * 3 / 8 + 590, + .colorspace = V4L2_COLORSPACE_JPEG}, +}; + +static void sd_isoc_irq(struct urb *urb); + +/* -- write a register -- */ +static void reg_w(struct gspca_dev *gspca_dev, + u16 value, u16 index) +{ + struct usb_device *dev = gspca_dev->dev; + int ret; + + if (gspca_dev->usb_err < 0) + return; + ret = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), + 0x02, + USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE, + value, + index, + NULL, + 0, + 500); + if (ret < 0) { + pr_err("reg_w err %d\n", ret); + gspca_dev->usb_err = ret; + } +} + +/* this function is called at probe time */ +static int sd_config(struct gspca_dev *gspca_dev, + const struct usb_device_id *id) +{ + gspca_dev->cam.cam_mode = vga_mode; + gspca_dev->cam.nmodes = ARRAY_SIZE(vga_mode); + gspca_dev->cam.no_urb_create = 1; + return 0; +} + +/* this function is called at probe and resume time */ +static int sd_init(struct gspca_dev *gspca_dev) +{ + return 0; +} + +/* -- start the camera -- */ +static int sd_start(struct gspca_dev *gspca_dev) +{ + struct urb *urb; + int i, n; + + /* create 4 URBs - 2 on endpoint 0x83 and 2 on 0x082 */ +#if MAX_NURBS < 4 +#error "Not enough URBs in the gspca table" +#endif +#define SD_PKT_SZ 64 +#define SD_NPKT 32 + for (n = 0; n < 4; n++) { + urb = usb_alloc_urb(SD_NPKT, GFP_KERNEL); + if (!urb) + return -ENOMEM; + gspca_dev->urb[n] = urb; + urb->transfer_buffer = usb_alloc_coherent(gspca_dev->dev, + SD_PKT_SZ * SD_NPKT, + GFP_KERNEL, + &urb->transfer_dma); + + if (urb->transfer_buffer == NULL) { + pr_err("usb_alloc_coherent failed\n"); + return -ENOMEM; + } + urb->dev = gspca_dev->dev; + urb->context = gspca_dev; + urb->transfer_buffer_length = SD_PKT_SZ * SD_NPKT; + urb->pipe = usb_rcvisocpipe(gspca_dev->dev, + n & 1 ? 0x82 : 0x83); + urb->transfer_flags = URB_ISO_ASAP + | URB_NO_TRANSFER_DMA_MAP; + urb->interval = 1; + urb->complete = sd_isoc_irq; + urb->number_of_packets = SD_NPKT; + for (i = 0; i < SD_NPKT; i++) { + urb->iso_frame_desc[i].length = SD_PKT_SZ; + urb->iso_frame_desc[i].offset = SD_PKT_SZ * i; + } + } + + return gspca_dev->usb_err; +} + +static void sd_stopN(struct gspca_dev *gspca_dev) +{ + struct usb_interface *intf; + + reg_w(gspca_dev, 0x003c, 0x0003); + reg_w(gspca_dev, 0x003c, 0x0004); + reg_w(gspca_dev, 0x003c, 0x0005); + reg_w(gspca_dev, 0x003c, 0x0006); + reg_w(gspca_dev, 0x003c, 0x0007); + + intf = usb_ifnum_to_if(gspca_dev->dev, gspca_dev->iface); + usb_set_interface(gspca_dev->dev, gspca_dev->iface, + intf->num_altsetting - 1); +} + +static void sd_pkt_scan(struct gspca_dev *gspca_dev, + u8 *data, /* isoc packet */ + int len) /* iso packet length */ +{ + /* unused */ +} + +/* reception of an URB */ +static void sd_isoc_irq(struct urb *urb) +{ + struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context; + struct urb *urb0; + u8 *data; + int i, st; + + gspca_dbg(gspca_dev, D_PACK, "sd isoc irq\n"); + if (!gspca_dev->streaming) + return; + if (urb->status != 0) { + if (urb->status == -ESHUTDOWN) + return; /* disconnection */ +#ifdef CONFIG_PM + if (gspca_dev->frozen) + return; +#endif + pr_err("urb status: %d\n", urb->status); + return; + } + + /* if this is a control URN (ep 0x83), wait */ + if (urb == gspca_dev->urb[0] || urb == gspca_dev->urb[2]) + return; + + /* scan both received URBs */ + if (urb == gspca_dev->urb[1]) + urb0 = gspca_dev->urb[0]; + else + urb0 = gspca_dev->urb[2]; + for (i = 0; i < urb->number_of_packets; i++) { + + /* check the packet status and length */ + if (urb0->iso_frame_desc[i].actual_length != SD_PKT_SZ + || urb->iso_frame_desc[i].actual_length != SD_PKT_SZ) { + gspca_err(gspca_dev, "ISOC bad lengths %d / %d\n", + urb0->iso_frame_desc[i].actual_length, + urb->iso_frame_desc[i].actual_length); + gspca_dev->last_packet_type = DISCARD_PACKET; + continue; + } + st = urb0->iso_frame_desc[i].status; + if (st == 0) + st = urb->iso_frame_desc[i].status; + if (st) { + pr_err("ISOC data error: [%d] status=%d\n", + i, st); + gspca_dev->last_packet_type = DISCARD_PACKET; + continue; + } + + /* + * The images are received in URBs of different endpoints + * (0x83 and 0x82). + * Image pieces in URBs of ep 0x83 are continuated in URBs of + * ep 0x82 of the same index. + * The packets in the URBs of endpoint 0x83 start with: + * - 80 ba/bb 00 00 = start of image followed by 'ff d8' + * - 04 ba/bb oo oo = image piece + * where 'oo oo' is the image offset + (not checked) + * - (other -> bad frame) + * The images are JPEG encoded with full header and + * normal ff escape. + * The end of image ('ff d9') may occur in any URB. + * (not checked) + */ + data = (u8 *) urb0->transfer_buffer + + urb0->iso_frame_desc[i].offset; + if (data[0] == 0x80 && (data[1] & 0xfe) == 0xba) { + + /* new image */ + gspca_frame_add(gspca_dev, LAST_PACKET, + NULL, 0); + gspca_frame_add(gspca_dev, FIRST_PACKET, + data + 4, SD_PKT_SZ - 4); + } else if (data[0] == 0x04 && (data[1] & 0xfe) == 0xba) { + gspca_frame_add(gspca_dev, INTER_PACKET, + data + 4, SD_PKT_SZ - 4); + } else { + gspca_dev->last_packet_type = DISCARD_PACKET; + continue; + } + data = (u8 *) urb->transfer_buffer + + urb->iso_frame_desc[i].offset; + gspca_frame_add(gspca_dev, INTER_PACKET, + data, SD_PKT_SZ); + } + + /* resubmit the URBs */ + st = usb_submit_urb(urb0, GFP_ATOMIC); + if (st < 0) + pr_err("usb_submit_urb(0) ret %d\n", st); + st = usb_submit_urb(urb, GFP_ATOMIC); + if (st < 0) + pr_err("usb_submit_urb() ret %d\n", st); +} + +/* sub-driver description */ +static const struct sd_desc sd_desc = { + .name = MODULE_NAME, + .config = sd_config, + .init = sd_init, + .start = sd_start, + .stopN = sd_stopN, + .pkt_scan = sd_pkt_scan, +}; + +/* -- module initialisation -- */ +static const struct usb_device_id device_table[] = { + {USB_DEVICE(0x04a5, 0x3035)}, + {} +}; +MODULE_DEVICE_TABLE(usb, device_table); + +/* -- 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, + .reset_resume = gspca_resume, +#endif +}; + +module_usb_driver(sd_driver); |