648 lines
16 KiB
C
648 lines
16 KiB
C
/*
|
|
em28xx-core.c - driver for Empia EM2800/EM2820/2840 USB video capture devices
|
|
|
|
Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it>
|
|
Markus Rechberger <mrechberger@gmail.com>
|
|
Mauro Carvalho Chehab <mchehab@infradead.org>
|
|
Sascha Sommer <saschasommer@freenet.de>
|
|
|
|
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
|
|
(at your option) 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., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*/
|
|
|
|
#include <linux/init.h>
|
|
#include <linux/list.h>
|
|
#include <linux/module.h>
|
|
#include <linux/usb.h>
|
|
#include <linux/vmalloc.h>
|
|
|
|
#include "em28xx.h"
|
|
|
|
/* #define ENABLE_DEBUG_ISOC_FRAMES */
|
|
|
|
static unsigned int core_debug;
|
|
module_param(core_debug,int,0644);
|
|
MODULE_PARM_DESC(core_debug,"enable debug messages [core]");
|
|
|
|
#define em28xx_coredbg(fmt, arg...) do {\
|
|
if (core_debug) \
|
|
printk(KERN_INFO "%s %s :"fmt, \
|
|
dev->name, __func__ , ##arg); } while (0)
|
|
|
|
static unsigned int reg_debug;
|
|
module_param(reg_debug,int,0644);
|
|
MODULE_PARM_DESC(reg_debug,"enable debug messages [URB reg]");
|
|
|
|
#define em28xx_regdbg(fmt, arg...) do {\
|
|
if (reg_debug) \
|
|
printk(KERN_INFO "%s %s :"fmt, \
|
|
dev->name, __func__ , ##arg); } while (0)
|
|
|
|
static int alt = EM28XX_PINOUT;
|
|
module_param(alt, int, 0644);
|
|
MODULE_PARM_DESC(alt, "alternate setting to use for video endpoint");
|
|
|
|
/* FIXME */
|
|
#define em28xx_isocdbg(fmt, arg...) do {\
|
|
if (core_debug) \
|
|
printk(KERN_INFO "%s %s :"fmt, \
|
|
dev->name, __func__ , ##arg); } while (0)
|
|
|
|
/*
|
|
* em28xx_read_reg_req()
|
|
* reads data from the usb device specifying bRequest
|
|
*/
|
|
int em28xx_read_reg_req_len(struct em28xx *dev, u8 req, u16 reg,
|
|
char *buf, int len)
|
|
{
|
|
int ret, byte;
|
|
|
|
if (dev->state & DEV_DISCONNECTED)
|
|
return(-ENODEV);
|
|
|
|
em28xx_regdbg("req=%02x, reg=%02x ", req, reg);
|
|
|
|
ret = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0), req,
|
|
USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
|
|
0x0000, reg, buf, len, HZ);
|
|
|
|
if (reg_debug) {
|
|
printk(ret < 0 ? " failed!\n" : "%02x values: ", ret);
|
|
for (byte = 0; byte < len; byte++)
|
|
printk(KERN_INFO " %02x", (unsigned char)buf[byte]);
|
|
|
|
printk(KERN_INFO "\n");
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* em28xx_read_reg_req()
|
|
* reads data from the usb device specifying bRequest
|
|
*/
|
|
int em28xx_read_reg_req(struct em28xx *dev, u8 req, u16 reg)
|
|
{
|
|
u8 val;
|
|
int ret;
|
|
|
|
if (dev->state & DEV_DISCONNECTED)
|
|
return(-ENODEV);
|
|
|
|
em28xx_regdbg("req=%02x, reg=%02x:", req, reg);
|
|
|
|
ret = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0), req,
|
|
USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
|
|
0x0000, reg, &val, 1, HZ);
|
|
|
|
if (reg_debug)
|
|
printk(ret < 0 ? " failed!\n" :
|
|
"%02x\n", (unsigned char) val);
|
|
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return val;
|
|
}
|
|
|
|
int em28xx_read_reg(struct em28xx *dev, u16 reg)
|
|
{
|
|
return em28xx_read_reg_req(dev, USB_REQ_GET_STATUS, reg);
|
|
}
|
|
|
|
/*
|
|
* em28xx_write_regs_req()
|
|
* sends data to the usb device, specifying bRequest
|
|
*/
|
|
int em28xx_write_regs_req(struct em28xx *dev, u8 req, u16 reg, char *buf,
|
|
int len)
|
|
{
|
|
int ret;
|
|
|
|
/*usb_control_msg seems to expect a kmalloced buffer */
|
|
unsigned char *bufs;
|
|
|
|
if (dev->state & DEV_DISCONNECTED)
|
|
return(-ENODEV);
|
|
|
|
bufs = kmalloc(len, GFP_KERNEL);
|
|
|
|
em28xx_regdbg("req=%02x reg=%02x:", req, reg);
|
|
|
|
if (reg_debug) {
|
|
int i;
|
|
for (i = 0; i < len; ++i)
|
|
printk(KERN_INFO " %02x", (unsigned char)buf[i]);
|
|
printk(KERN_INFO "\n");
|
|
}
|
|
|
|
if (!bufs)
|
|
return -ENOMEM;
|
|
memcpy(bufs, buf, len);
|
|
ret = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0), req,
|
|
USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
|
|
0x0000, reg, bufs, len, HZ);
|
|
kfree(bufs);
|
|
return ret;
|
|
}
|
|
|
|
int em28xx_write_regs(struct em28xx *dev, u16 reg, char *buf, int len)
|
|
{
|
|
return em28xx_write_regs_req(dev, USB_REQ_GET_STATUS, reg, buf, len);
|
|
}
|
|
|
|
/*
|
|
* em28xx_write_reg_bits()
|
|
* sets only some bits (specified by bitmask) of a register, by first reading
|
|
* the actual value
|
|
*/
|
|
static int em28xx_write_reg_bits(struct em28xx *dev, u16 reg, u8 val,
|
|
u8 bitmask)
|
|
{
|
|
int oldval;
|
|
u8 newval;
|
|
|
|
oldval = em28xx_read_reg(dev, reg);
|
|
|
|
if (oldval < 0)
|
|
return oldval;
|
|
|
|
newval = (((u8) oldval) & ~bitmask) | (val & bitmask);
|
|
return em28xx_write_regs(dev, reg, &newval, 1);
|
|
}
|
|
|
|
/*
|
|
* em28xx_write_ac97()
|
|
* write a 16 bit value to the specified AC97 address (LSB first!)
|
|
*/
|
|
static int em28xx_write_ac97(struct em28xx *dev, u8 reg, u8 *val)
|
|
{
|
|
int ret, i;
|
|
u8 addr = reg & 0x7f;
|
|
|
|
ret = em28xx_write_regs(dev, AC97LSB_REG, val, 2);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = em28xx_write_regs(dev, AC97ADDR_REG, &addr, 1);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
/* Wait up to 50 ms for AC97 command to complete */
|
|
for (i = 0; i < 10; i++) {
|
|
ret = em28xx_read_reg(dev, AC97BUSY_REG);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (!(ret & 0x01))
|
|
return 0;
|
|
msleep(5);
|
|
}
|
|
em28xx_warn("AC97 command still being executed: not handled properly!\n");
|
|
return 0;
|
|
}
|
|
|
|
static int em28xx_set_audio_source(struct em28xx *dev)
|
|
{
|
|
static char *enable = "\x08\x08";
|
|
static char *disable = "\x08\x88";
|
|
char *video = enable, *line = disable;
|
|
int ret;
|
|
u8 input;
|
|
|
|
if (dev->is_em2800) {
|
|
if (dev->ctl_ainput)
|
|
input = EM2800_AUDIO_SRC_LINE;
|
|
else
|
|
input = EM2800_AUDIO_SRC_TUNER;
|
|
|
|
ret = em28xx_write_regs(dev, EM2800_AUDIOSRC_REG, &input, 1);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
if (dev->has_msp34xx)
|
|
input = EM28XX_AUDIO_SRC_TUNER;
|
|
else {
|
|
switch (dev->ctl_ainput) {
|
|
case EM28XX_AMUX_VIDEO:
|
|
input = EM28XX_AUDIO_SRC_TUNER;
|
|
break;
|
|
case EM28XX_AMUX_LINE_IN:
|
|
input = EM28XX_AUDIO_SRC_LINE;
|
|
break;
|
|
case EM28XX_AMUX_AC97_VIDEO:
|
|
input = EM28XX_AUDIO_SRC_LINE;
|
|
break;
|
|
case EM28XX_AMUX_AC97_LINE_IN:
|
|
input = EM28XX_AUDIO_SRC_LINE;
|
|
video = disable;
|
|
line = enable;
|
|
break;
|
|
}
|
|
}
|
|
|
|
ret = em28xx_write_reg_bits(dev, AUDIOSRC_REG, input, 0xc0);
|
|
if (ret < 0)
|
|
return ret;
|
|
msleep(5);
|
|
|
|
/* Sets AC97 mixer registers
|
|
This is seems to be needed, even for non-ac97 configs
|
|
*/
|
|
ret = em28xx_write_ac97(dev, VIDEO_AC97, video);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
ret = em28xx_write_ac97(dev, LINE_IN_AC97, line);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int em28xx_audio_analog_set(struct em28xx *dev)
|
|
{
|
|
int ret;
|
|
char s[2] = { 0x00, 0x00 };
|
|
u8 xclk = 0x07;
|
|
|
|
s[0] |= 0x1f - dev->volume;
|
|
s[1] |= 0x1f - dev->volume;
|
|
|
|
/* Mute */
|
|
s[1] |= 0x80;
|
|
ret = em28xx_write_ac97(dev, MASTER_AC97, s);
|
|
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (dev->has_12mhz_i2s)
|
|
xclk |= 0x20;
|
|
|
|
if (!dev->mute)
|
|
xclk |= 0x80;
|
|
|
|
ret = em28xx_write_reg_bits(dev, XCLK_REG, xclk, 0xa7);
|
|
if (ret < 0)
|
|
return ret;
|
|
msleep(10);
|
|
|
|
/* Selects the proper audio input */
|
|
ret = em28xx_set_audio_source(dev);
|
|
|
|
/* Unmute device */
|
|
if (!dev->mute)
|
|
s[1] &= ~0x80;
|
|
ret = em28xx_write_ac97(dev, MASTER_AC97, s);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(em28xx_audio_analog_set);
|
|
|
|
int em28xx_colorlevels_set_default(struct em28xx *dev)
|
|
{
|
|
em28xx_write_regs(dev, YGAIN_REG, "\x10", 1); /* contrast */
|
|
em28xx_write_regs(dev, YOFFSET_REG, "\x00", 1); /* brightness */
|
|
em28xx_write_regs(dev, UVGAIN_REG, "\x10", 1); /* saturation */
|
|
em28xx_write_regs(dev, UOFFSET_REG, "\x00", 1);
|
|
em28xx_write_regs(dev, VOFFSET_REG, "\x00", 1);
|
|
em28xx_write_regs(dev, SHARPNESS_REG, "\x00", 1);
|
|
|
|
em28xx_write_regs(dev, GAMMA_REG, "\x20", 1);
|
|
em28xx_write_regs(dev, RGAIN_REG, "\x20", 1);
|
|
em28xx_write_regs(dev, GGAIN_REG, "\x20", 1);
|
|
em28xx_write_regs(dev, BGAIN_REG, "\x20", 1);
|
|
em28xx_write_regs(dev, ROFFSET_REG, "\x00", 1);
|
|
em28xx_write_regs(dev, GOFFSET_REG, "\x00", 1);
|
|
return em28xx_write_regs(dev, BOFFSET_REG, "\x00", 1);
|
|
}
|
|
|
|
int em28xx_capture_start(struct em28xx *dev, int start)
|
|
{
|
|
int rc;
|
|
/* FIXME: which is the best order? */
|
|
/* video registers are sampled by VREF */
|
|
rc = em28xx_write_reg_bits(dev, USBSUSP_REG,
|
|
start ? 0x10 : 0x00, 0x10);
|
|
if (rc < 0)
|
|
return rc;
|
|
|
|
if (!start) {
|
|
/* disable video capture */
|
|
rc = em28xx_write_regs(dev, VINENABLE_REG, "\x27", 1);
|
|
return rc;
|
|
}
|
|
|
|
/* enable video capture */
|
|
rc = em28xx_write_regs_req(dev, 0x00, 0x48, "\x00", 1);
|
|
|
|
if (dev->mode == EM28XX_ANALOG_MODE)
|
|
rc = em28xx_write_regs(dev, VINENABLE_REG, "\x67", 1);
|
|
else
|
|
rc = em28xx_write_regs(dev, VINENABLE_REG, "\x37", 1);
|
|
|
|
msleep(6);
|
|
|
|
return rc;
|
|
}
|
|
|
|
int em28xx_outfmt_set_yuv422(struct em28xx *dev)
|
|
{
|
|
em28xx_write_regs(dev, OUTFMT_REG, "\x34", 1);
|
|
em28xx_write_regs(dev, VINMODE_REG, "\x10", 1);
|
|
return em28xx_write_regs(dev, VINCTRL_REG, "\x11", 1);
|
|
}
|
|
|
|
static int em28xx_accumulator_set(struct em28xx *dev, u8 xmin, u8 xmax,
|
|
u8 ymin, u8 ymax)
|
|
{
|
|
em28xx_coredbg("em28xx Scale: (%d,%d)-(%d,%d)\n",
|
|
xmin, ymin, xmax, ymax);
|
|
|
|
em28xx_write_regs(dev, XMIN_REG, &xmin, 1);
|
|
em28xx_write_regs(dev, XMAX_REG, &xmax, 1);
|
|
em28xx_write_regs(dev, YMIN_REG, &ymin, 1);
|
|
return em28xx_write_regs(dev, YMAX_REG, &ymax, 1);
|
|
}
|
|
|
|
static int em28xx_capture_area_set(struct em28xx *dev, u8 hstart, u8 vstart,
|
|
u16 width, u16 height)
|
|
{
|
|
u8 cwidth = width;
|
|
u8 cheight = height;
|
|
u8 overflow = (height >> 7 & 0x02) | (width >> 8 & 0x01);
|
|
|
|
em28xx_coredbg("em28xx Area Set: (%d,%d)\n",
|
|
(width | (overflow & 2) << 7),
|
|
(height | (overflow & 1) << 8));
|
|
|
|
em28xx_write_regs(dev, HSTART_REG, &hstart, 1);
|
|
em28xx_write_regs(dev, VSTART_REG, &vstart, 1);
|
|
em28xx_write_regs(dev, CWIDTH_REG, &cwidth, 1);
|
|
em28xx_write_regs(dev, CHEIGHT_REG, &cheight, 1);
|
|
return em28xx_write_regs(dev, OFLOW_REG, &overflow, 1);
|
|
}
|
|
|
|
static int em28xx_scaler_set(struct em28xx *dev, u16 h, u16 v)
|
|
{
|
|
u8 mode;
|
|
/* the em2800 scaler only supports scaling down to 50% */
|
|
if (dev->is_em2800)
|
|
mode = (v ? 0x20 : 0x00) | (h ? 0x10 : 0x00);
|
|
else {
|
|
u8 buf[2];
|
|
buf[0] = h;
|
|
buf[1] = h >> 8;
|
|
em28xx_write_regs(dev, HSCALELOW_REG, (char *)buf, 2);
|
|
buf[0] = v;
|
|
buf[1] = v >> 8;
|
|
em28xx_write_regs(dev, VSCALELOW_REG, (char *)buf, 2);
|
|
/* it seems that both H and V scalers must be active
|
|
to work correctly */
|
|
mode = (h || v)? 0x30: 0x00;
|
|
}
|
|
return em28xx_write_reg_bits(dev, COMPR_REG, mode, 0x30);
|
|
}
|
|
|
|
/* FIXME: this only function read values from dev */
|
|
int em28xx_resolution_set(struct em28xx *dev)
|
|
{
|
|
int width, height;
|
|
width = norm_maxw(dev);
|
|
height = norm_maxh(dev) >> 1;
|
|
|
|
em28xx_outfmt_set_yuv422(dev);
|
|
em28xx_accumulator_set(dev, 1, (width - 4) >> 2, 1, (height - 4) >> 2);
|
|
em28xx_capture_area_set(dev, 0, 0, width >> 2, height >> 2);
|
|
return em28xx_scaler_set(dev, dev->hscale, dev->vscale);
|
|
}
|
|
|
|
int em28xx_set_alternate(struct em28xx *dev)
|
|
{
|
|
int errCode, prev_alt = dev->alt;
|
|
int i;
|
|
unsigned int min_pkt_size = dev->width * 2 + 4;
|
|
|
|
/* When image size is bigger than a certain value,
|
|
the frame size should be increased, otherwise, only
|
|
green screen will be received.
|
|
*/
|
|
if (dev->width * 2 * dev->height > 720 * 240 * 2)
|
|
min_pkt_size *= 2;
|
|
|
|
for (i = 0; i < dev->num_alt; i++) {
|
|
/* stop when the selected alt setting offers enough bandwidth */
|
|
if (dev->alt_max_pkt_size[i] >= min_pkt_size) {
|
|
dev->alt = i;
|
|
break;
|
|
/* otherwise make sure that we end up with the maximum bandwidth
|
|
because the min_pkt_size equation might be wrong...
|
|
*/
|
|
} else if (dev->alt_max_pkt_size[i] >
|
|
dev->alt_max_pkt_size[dev->alt])
|
|
dev->alt = i;
|
|
}
|
|
|
|
if (dev->alt != prev_alt) {
|
|
em28xx_coredbg("minimum isoc packet size: %u (alt=%d)\n",
|
|
min_pkt_size, dev->alt);
|
|
dev->max_pkt_size = dev->alt_max_pkt_size[dev->alt];
|
|
em28xx_coredbg("setting alternate %d with wMaxPacketSize=%u\n",
|
|
dev->alt, dev->max_pkt_size);
|
|
errCode = usb_set_interface(dev->udev, 0, dev->alt);
|
|
if (errCode < 0) {
|
|
em28xx_errdev("cannot change alternate number to %d (error=%i)\n",
|
|
dev->alt, errCode);
|
|
return errCode;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* ------------------------------------------------------------------
|
|
URB control
|
|
------------------------------------------------------------------*/
|
|
|
|
/*
|
|
* IRQ callback, called by URB callback
|
|
*/
|
|
static void em28xx_irq_callback(struct urb *urb)
|
|
{
|
|
struct em28xx_dmaqueue *dma_q = urb->context;
|
|
struct em28xx *dev = container_of(dma_q, struct em28xx, vidq);
|
|
int rc, i;
|
|
|
|
/* Copy data from URB */
|
|
spin_lock(&dev->slock);
|
|
rc = dev->isoc_ctl.isoc_copy(dev, urb);
|
|
spin_unlock(&dev->slock);
|
|
|
|
/* Reset urb buffers */
|
|
for (i = 0; i < urb->number_of_packets; i++) {
|
|
urb->iso_frame_desc[i].status = 0;
|
|
urb->iso_frame_desc[i].actual_length = 0;
|
|
}
|
|
urb->status = 0;
|
|
|
|
urb->status = usb_submit_urb(urb, GFP_ATOMIC);
|
|
if (urb->status) {
|
|
em28xx_err("urb resubmit failed (error=%i)\n",
|
|
urb->status);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Stop and Deallocate URBs
|
|
*/
|
|
void em28xx_uninit_isoc(struct em28xx *dev)
|
|
{
|
|
struct urb *urb;
|
|
int i;
|
|
|
|
em28xx_isocdbg("em28xx: called em28xx_uninit_isoc\n");
|
|
|
|
dev->isoc_ctl.nfields = -1;
|
|
for (i = 0; i < dev->isoc_ctl.num_bufs; i++) {
|
|
urb = dev->isoc_ctl.urb[i];
|
|
if (urb) {
|
|
usb_kill_urb(urb);
|
|
usb_unlink_urb(urb);
|
|
if (dev->isoc_ctl.transfer_buffer[i]) {
|
|
usb_buffer_free(dev->udev,
|
|
urb->transfer_buffer_length,
|
|
dev->isoc_ctl.transfer_buffer[i],
|
|
urb->transfer_dma);
|
|
}
|
|
usb_free_urb(urb);
|
|
dev->isoc_ctl.urb[i] = NULL;
|
|
}
|
|
dev->isoc_ctl.transfer_buffer[i] = NULL;
|
|
}
|
|
|
|
kfree(dev->isoc_ctl.urb);
|
|
kfree(dev->isoc_ctl.transfer_buffer);
|
|
|
|
dev->isoc_ctl.urb = NULL;
|
|
dev->isoc_ctl.transfer_buffer = NULL;
|
|
dev->isoc_ctl.num_bufs = 0;
|
|
|
|
em28xx_capture_start(dev, 0);
|
|
}
|
|
EXPORT_SYMBOL_GPL(em28xx_uninit_isoc);
|
|
|
|
/*
|
|
* Allocate URBs and start IRQ
|
|
*/
|
|
int em28xx_init_isoc(struct em28xx *dev, int max_packets,
|
|
int num_bufs, int max_pkt_size,
|
|
int (*isoc_copy) (struct em28xx *dev, struct urb *urb),
|
|
int cap_type)
|
|
{
|
|
struct em28xx_dmaqueue *dma_q = &dev->vidq;
|
|
int i;
|
|
int sb_size, pipe;
|
|
struct urb *urb;
|
|
int j, k;
|
|
int rc;
|
|
|
|
em28xx_isocdbg("em28xx: called em28xx_prepare_isoc\n");
|
|
|
|
/* De-allocates all pending stuff */
|
|
em28xx_uninit_isoc(dev);
|
|
|
|
dev->isoc_ctl.isoc_copy = isoc_copy;
|
|
dev->isoc_ctl.num_bufs = num_bufs;
|
|
|
|
dev->isoc_ctl.urb = kzalloc(sizeof(void *)*num_bufs, GFP_KERNEL);
|
|
if (!dev->isoc_ctl.urb) {
|
|
em28xx_errdev("cannot alloc memory for usb buffers\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
dev->isoc_ctl.transfer_buffer = kzalloc(sizeof(void *)*num_bufs,
|
|
GFP_KERNEL);
|
|
if (!dev->isoc_ctl.urb) {
|
|
em28xx_errdev("cannot allocate memory for usbtransfer\n");
|
|
kfree(dev->isoc_ctl.urb);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
dev->isoc_ctl.max_pkt_size = max_pkt_size;
|
|
dev->isoc_ctl.buf = NULL;
|
|
|
|
sb_size = max_packets * dev->isoc_ctl.max_pkt_size;
|
|
|
|
/* allocate urbs and transfer buffers */
|
|
for (i = 0; i < dev->isoc_ctl.num_bufs; i++) {
|
|
urb = usb_alloc_urb(max_packets, GFP_KERNEL);
|
|
if (!urb) {
|
|
em28xx_err("cannot alloc isoc_ctl.urb %i\n", i);
|
|
em28xx_uninit_isoc(dev);
|
|
return -ENOMEM;
|
|
}
|
|
dev->isoc_ctl.urb[i] = urb;
|
|
|
|
dev->isoc_ctl.transfer_buffer[i] = usb_buffer_alloc(dev->udev,
|
|
sb_size, GFP_KERNEL, &urb->transfer_dma);
|
|
if (!dev->isoc_ctl.transfer_buffer[i]) {
|
|
em28xx_err("unable to allocate %i bytes for transfer"
|
|
" buffer %i%s\n",
|
|
sb_size, i,
|
|
in_interrupt()?" while in int":"");
|
|
em28xx_uninit_isoc(dev);
|
|
return -ENOMEM;
|
|
}
|
|
memset(dev->isoc_ctl.transfer_buffer[i], 0, sb_size);
|
|
|
|
/* FIXME: this is a hack - should be
|
|
'desc.bEndpointAddress & USB_ENDPOINT_NUMBER_MASK'
|
|
should also be using 'desc.bInterval'
|
|
*/
|
|
pipe = usb_rcvisocpipe(dev->udev,
|
|
cap_type == EM28XX_ANALOG_CAPTURE ? 0x82 : 0x84);
|
|
|
|
usb_fill_int_urb(urb, dev->udev, pipe,
|
|
dev->isoc_ctl.transfer_buffer[i], sb_size,
|
|
em28xx_irq_callback, dma_q, 1);
|
|
|
|
urb->number_of_packets = max_packets;
|
|
urb->transfer_flags = URB_ISO_ASAP;
|
|
|
|
k = 0;
|
|
for (j = 0; j < max_packets; j++) {
|
|
urb->iso_frame_desc[j].offset = k;
|
|
urb->iso_frame_desc[j].length =
|
|
dev->isoc_ctl.max_pkt_size;
|
|
k += dev->isoc_ctl.max_pkt_size;
|
|
}
|
|
}
|
|
|
|
init_waitqueue_head(&dma_q->wq);
|
|
|
|
em28xx_capture_start(dev, cap_type);
|
|
|
|
/* submit urbs and enables IRQ */
|
|
for (i = 0; i < dev->isoc_ctl.num_bufs; i++) {
|
|
rc = usb_submit_urb(dev->isoc_ctl.urb[i], GFP_ATOMIC);
|
|
if (rc) {
|
|
em28xx_err("submit of urb %i failed (error=%i)\n", i,
|
|
rc);
|
|
em28xx_uninit_isoc(dev);
|
|
return rc;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(em28xx_init_isoc);
|