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linux/drivers/media/video/gspca/benq.c

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/*
* Benq DC E300 subdriver
*
* Copyright (C) 2009 Jean-Francois Moine (http://moinejf.free.fr)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#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 */
};
/* V4L2 controls supported by the driver */
static const struct ctrl sd_ctrls[] = {
};
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) {
PDEBUG(D_ERR, "reg_w err %d", 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;
gspca_dev->cam.reverse_alts = 1;
return 0;
}
/* this function is called at probe and resume time */
static int sd_init(struct gspca_dev *gspca_dev)
{
return 0;
}
static int sd_isoc_init(struct gspca_dev *gspca_dev)
{
int ret;
ret = usb_set_interface(gspca_dev->dev, gspca_dev->iface,
gspca_dev->nbalt - 1);
if (ret < 0) {
err("usb_set_interface failed");
return ret;
}
/* reg_w(gspca_dev, 0x0003, 0x0002); */
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) {
err("usb_alloc_urb failed");
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) {
err("usb_alloc_coherent failed");
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)
{
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);
usb_set_interface(gspca_dev->dev, gspca_dev->iface, gspca_dev->nbalt - 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;
PDEBUG(D_PACK, "sd isoc irq");
if (!gspca_dev->streaming)
return;
if (urb->status != 0) {
if (urb->status == -ESHUTDOWN)
return; /* disconnection */
#ifdef CONFIG_PM
if (gspca_dev->frozen)
return;
#endif
PDEBUG(D_ERR|D_PACK, "urb status: %d", 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) {
PDEBUG(D_ERR, "ISOC bad lengths %d / %d",
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) {
PDEBUG(D_ERR,
"ISOC data error: [%d] status=%d",
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 cheked)
* - (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 cheked)
*/
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)
PDEBUG(D_ERR|D_PACK, "usb_submit_urb(0) ret %d", st);
st = usb_submit_urb(urb, GFP_ATOMIC);
if (st < 0)
PDEBUG(D_ERR|D_PACK, "usb_submit_urb() ret %d", st);
}
/* sub-driver description */
static const struct sd_desc sd_desc = {
.name = MODULE_NAME,
.ctrls = sd_ctrls,
.nctrls = ARRAY_SIZE(sd_ctrls),
.config = sd_config,
.init = sd_init,
.isoc_init = sd_isoc_init,
.start = sd_start,
.stopN = sd_stopN,
.pkt_scan = sd_pkt_scan,
};
/* -- module initialisation -- */
static const __devinitdata 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,
#endif
};
/* -- module insert / remove -- */
static int __init sd_mod_init(void)
{
int ret;
ret = usb_register(&sd_driver);
if (ret < 0)
return ret;
info("registered");
return 0;
}
static void __exit sd_mod_exit(void)
{
usb_deregister(&sd_driver);
info("deregistered");
}
module_init(sd_mod_init);
module_exit(sd_mod_exit);
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