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linux/drivers/media/video/em28xx/em28xx-core.c

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[PATCH] v4l: 716: support for em28xx board family - Added support for em28xx board family Signed-off-by: Ludovico Cavedon <cavedon@sssup.it> Signed-off-by: Markus Rechberger <mrechberger@gmail.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@brturbo.com.br> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-09 05:37:07 +00:00
/*
em2820-core.c - driver for Empia EM2820/2840 USB video capture devices
Copyright (C) 2005 Markus Rechberger <mrechberger@gmail.com>
Ludovico Cavedon <cavedon@sssup.it>
Mauro Carvalho Chehab <mchehab@brturbo.com.br>
Based on the em2800 driver from 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/moduleparam.h>
#include <linux/usb.h>
#include <linux/vmalloc.h>
#include "em2820.h"
/* #define ENABLE_DEBUG_ISOC_FRAMES */
unsigned int core_debug = 0;
module_param(core_debug,int,0644);
MODULE_PARM_DESC(core_debug,"enable debug messages [core]");
#define em2820_coredbg(fmt, arg...) do {\
if (core_debug) \
printk(KERN_INFO "%s %s :"fmt, \
dev->name, __FUNCTION__ , ##arg); } while (0)
unsigned int reg_debug = 0;
module_param(reg_debug,int,0644);
MODULE_PARM_DESC(reg_debug,"enable debug messages [URB reg]");
#define em2820_regdbg(fmt, arg...) do {\
if (reg_debug) \
printk(KERN_INFO "%s %s :"fmt, \
dev->name, __FUNCTION__ , ##arg); } while (0)
unsigned int isoc_debug = 0;
module_param(isoc_debug,int,0644);
MODULE_PARM_DESC(core_debug,"enable debug messages [isoc transfers]");
#define em2820_isocdbg(fmt, arg...) do {\
if (isoc_debug) \
printk(KERN_INFO "%s %s :"fmt, \
dev->name, __FUNCTION__ , ##arg); } while (0)
static int alt = EM2820_PINOUT;
module_param(alt, int, 0644);
MODULE_PARM_DESC(alt, "alternate setting to use for video endpoint");
/* ------------------------------------------------------------------ */
/* debug help functions */
static const char *v4l1_ioctls[] = {
"0", "CGAP", "GCHAN", "SCHAN", "GTUNER", "STUNER", "GPICT", "SPICT",
"CCAPTURE", "GWIN", "SWIN", "GFBUF", "SFBUF", "KEY", "GFREQ",
"SFREQ", "GAUDIO", "SAUDIO", "SYNC", "MCAPTURE", "GMBUF", "GUNIT",
"GCAPTURE", "SCAPTURE", "SPLAYMODE", "SWRITEMODE", "GPLAYINFO",
"SMICROCODE", "GVBIFMT", "SVBIFMT" };
#define V4L1_IOCTLS ARRAY_SIZE(v4l1_ioctls)
static const char *v4l2_ioctls[] = {
"QUERYCAP", "1", "ENUM_PIXFMT", "ENUM_FBUFFMT", "G_FMT", "S_FMT",
"G_COMP", "S_COMP", "REQBUFS", "QUERYBUF", "G_FBUF", "S_FBUF",
"G_WIN", "S_WIN", "PREVIEW", "QBUF", "16", "DQBUF", "STREAMON",
"STREAMOFF", "G_PERF", "G_PARM", "S_PARM", "G_STD", "S_STD",
"ENUMSTD", "ENUMINPUT", "G_CTRL", "S_CTRL", "G_TUNER", "S_TUNER",
"G_FREQ", "S_FREQ", "G_AUDIO", "S_AUDIO", "35", "QUERYCTRL",
"QUERYMENU", "G_INPUT", "S_INPUT", "ENUMCVT", "41", "42", "43",
"44", "45", "G_OUTPUT", "S_OUTPUT", "ENUMOUTPUT", "G_AUDOUT",
"S_AUDOUT", "ENUMFX", "G_EFFECT", "S_EFFECT", "G_MODULATOR",
"S_MODULATOR"
};
#define V4L2_IOCTLS ARRAY_SIZE(v4l2_ioctls)
void em2820_print_ioctl(char *name, unsigned int cmd)
{
char *dir;
switch (_IOC_DIR(cmd)) {
case _IOC_NONE: dir = "--"; break;
case _IOC_READ: dir = "r-"; break;
case _IOC_WRITE: dir = "-w"; break;
case _IOC_READ | _IOC_WRITE: dir = "rw"; break;
default: dir = "??"; break;
}
switch (_IOC_TYPE(cmd)) {
case 'v':
printk(KERN_DEBUG "%s: ioctl 0x%08x (v4l1, %s, VIDIOC%s)\n",
name, cmd, dir, (_IOC_NR(cmd) < V4L1_IOCTLS) ?
v4l1_ioctls[_IOC_NR(cmd)] : "???");
break;
case 'V':
printk(KERN_DEBUG "%s: ioctl 0x%08x (v4l2, %s, VIDIOC_%s)\n",
name, cmd, dir, (_IOC_NR(cmd) < V4L2_IOCTLS) ?
v4l2_ioctls[_IOC_NR(cmd)] : "???");
break;
default:
printk(KERN_DEBUG "%s: ioctl 0x%08x (???, %s, #%d)\n",
name, cmd, dir, _IOC_NR(cmd));
}
}
static void *rvmalloc(size_t size)
{
void *mem;
unsigned long adr;
size = PAGE_ALIGN(size);
mem = vmalloc_32((unsigned long)size);
if (!mem)
return NULL;
memset(mem, 0, size);
adr = (unsigned long)mem;
while (size > 0) {
SetPageReserved(vmalloc_to_page((void *)adr));
adr += PAGE_SIZE;
size -= PAGE_SIZE;
}
return mem;
}
static void rvfree(void *mem, size_t size)
{
unsigned long adr;
if (!mem)
return;
size = PAGE_ALIGN(size);
adr = (unsigned long)mem;
while (size > 0) {
ClearPageReserved(vmalloc_to_page((void *)adr));
adr += PAGE_SIZE;
size -= PAGE_SIZE;
}
vfree(mem);
}
/*
* em2820_request_buffers()
* allocate a number of buffers
*/
u32 em2820_request_buffers(struct em2820 *dev, u32 count)
{
const size_t imagesize = PAGE_ALIGN(dev->frame_size); /*needs to be page aligned cause the buffers can be mapped individually! */
void *buff = NULL;
u32 i;
em2820_coredbg("requested %i buffers with size %i", count, imagesize);
if (count > EM2820_NUM_FRAMES)
count = EM2820_NUM_FRAMES;
dev->num_frames = count;
while (dev->num_frames > 0) {
if ((buff = rvmalloc(dev->num_frames * imagesize)))
break;
dev->num_frames--;
}
for (i = 0; i < dev->num_frames; i++) {
dev->frame[i].bufmem = buff + i * imagesize;
dev->frame[i].buf.index = i;
dev->frame[i].buf.m.offset = i * imagesize;
dev->frame[i].buf.length = dev->frame_size;
dev->frame[i].buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
dev->frame[i].buf.sequence = 0;
dev->frame[i].buf.field = V4L2_FIELD_NONE;
dev->frame[i].buf.memory = V4L2_MEMORY_MMAP;
dev->frame[i].buf.flags = 0;
}
return dev->num_frames;
}
/*
* em2820_queue_unusedframes()
* add all frames that are not currently in use to the inbuffer queue
*/
void em2820_queue_unusedframes(struct em2820 *dev)
{
unsigned long lock_flags;
u32 i;
for (i = 0; i < dev->num_frames; i++)
if (dev->frame[i].state == F_UNUSED) {
dev->frame[i].state = F_QUEUED;
spin_lock_irqsave(&dev->queue_lock, lock_flags);
list_add_tail(&dev->frame[i].frame, &dev->inqueue);
spin_unlock_irqrestore(&dev->queue_lock, lock_flags);
}
}
/*
* em2820_release_buffers()
* free frame buffers
*/
void em2820_release_buffers(struct em2820 *dev)
{
if (dev->num_frames) {
rvfree(dev->frame[0].bufmem,
dev->num_frames * PAGE_ALIGN(dev->frame[0].buf.length));
dev->num_frames = 0;
}
}
/*
* em2820_read_reg_req()
* reads data from the usb device specifying bRequest
*/
int em2820_read_reg_req_len(struct em2820 *dev, u8 req, u16 reg,
char *buf, int len)
{
int ret, byte;
em2820_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(" %02x", buf[byte]);
}
printk("\n");
}
return ret;
}
/*
* em2820_read_reg_req()
* reads data from the usb device specifying bRequest
*/
int em2820_read_reg_req(struct em2820 *dev, u8 req, u16 reg)
{
u8 val;
int ret;
em2820_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", val);
if (ret < 0)
return ret;
return val;
}
int em2820_read_reg(struct em2820 *dev, u16 reg)
{
return em2820_read_reg_req(dev, USB_REQ_GET_STATUS, reg);
}
/*
* em2820_write_regs_req()
* sends data to the usb device, specifying bRequest
*/
int em2820_write_regs_req(struct em2820 *dev, u8 req, u16 reg, char *buf,
int len)
{
int ret;
/*usb_control_msg seems to expect a kmalloced buffer */
unsigned char *bufs = kmalloc(len, GFP_KERNEL);
em2820_regdbg("req=%02x reg=%02x:", req, reg);
if (reg_debug) {
int i;
for (i = 0; i < len; ++i)
printk (" %02x", (unsigned char)buf[i]);
printk ("\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);
mdelay(5); /* FIXME: magic number */
kfree(bufs);
return ret;
}
int em2820_write_regs(struct em2820 *dev, u16 reg, char *buf, int len)
{
return em2820_write_regs_req(dev, USB_REQ_GET_STATUS, reg, buf, len);
}
/*
* em2820_write_reg_bits()
* sets only some bits (specified by bitmask) of a register, by first reading
* the actual value
*/
int em2820_write_reg_bits(struct em2820 *dev, u16 reg, u8 val,
u8 bitmask)
{
int oldval;
u8 newval;
if ((oldval = em2820_read_reg(dev, reg)) < 0)
return oldval;
newval = (((u8) oldval) & ~bitmask) | (val & bitmask);
return em2820_write_regs(dev, reg, &newval, 1);
}
/*
* em2820_write_ac97()
* write a 16 bit value to the specified AC97 address (LSB first!)
*/
int em2820_write_ac97(struct em2820 *dev, u8 reg, u8 * val)
{
int ret;
u8 addr = reg & 0x7f;
if ((ret = em2820_write_regs(dev, AC97LSB_REG, val, 2)) < 0)
return ret;
if ((ret = em2820_write_regs(dev, AC97ADDR_REG, &addr, 1)) < 0)
return ret;
if ((ret = em2820_read_reg(dev, AC97BUSY_REG)) < 0)
return ret;
else if (((u8) ret) & 0x01) {
em2820_warn ("AC97 command still being exectuted: not handled properly!\n");
}
return 0;
}
int em2820_audio_analog_set(struct em2820 *dev)
{
char s[2] = { 0x00, 0x00 };
s[0] |= 0x1f - dev->volume;
s[1] |= 0x1f - dev->volume;
if (dev->mute)
s[1] |= 0x80;
return em2820_write_ac97(dev, MASTER_AC97, s);
}
int em2820_colorlevels_set_default(struct em2820 *dev)
{
em2820_write_regs(dev, YGAIN_REG, "\x10", 1); /* contrast */
em2820_write_regs(dev, YOFFSET_REG, "\x00", 1); /* brightness */
em2820_write_regs(dev, UVGAIN_REG, "\x10", 1); /* saturation */
em2820_write_regs(dev, UOFFSET_REG, "\x00", 1);
em2820_write_regs(dev, VOFFSET_REG, "\x00", 1);
em2820_write_regs(dev, SHARPNESS_REG, "\x00", 1);
em2820_write_regs(dev, GAMMA_REG, "\x20", 1);
em2820_write_regs(dev, RGAIN_REG, "\x20", 1);
em2820_write_regs(dev, GGAIN_REG, "\x20", 1);
em2820_write_regs(dev, BGAIN_REG, "\x20", 1);
em2820_write_regs(dev, ROFFSET_REG, "\x00", 1);
em2820_write_regs(dev, GOFFSET_REG, "\x00", 1);
return em2820_write_regs(dev, BOFFSET_REG, "\x00", 1);
}
int em2820_capture_start(struct em2820 *dev, int start)
{
int ret;
/* FIXME: which is the best order? */
/* video registers are sampled by VREF */
if ((ret = em2820_write_reg_bits(dev, USBSUSP_REG, start ? 0x10 : 0x00,
0x10)) < 0)
return ret;
/* enable video capture */
return em2820_write_regs(dev, VINENABLE_REG, start ? "\x67" : "\x27", 1);
}
int em2820_outfmt_set_yuv422(struct em2820 *dev)
{
em2820_write_regs(dev, OUTFMT_REG, "\x34", 1);
em2820_write_regs(dev, VINMODE_REG, "\x10", 1);
return em2820_write_regs(dev, VINCTRL_REG, "\x11", 1);
}
int em2820_accumulator_set(struct em2820 *dev, u8 xmin, u8 xmax, u8 ymin,
u8 ymax)
{
em2820_coredbg("em2820 Scale: (%d,%d)-(%d,%d)\n", xmin, ymin, xmax, ymax);
em2820_write_regs(dev, XMIN_REG, &xmin, 1);
em2820_write_regs(dev, XMAX_REG, &xmax, 1);
em2820_write_regs(dev, YMIN_REG, &ymin, 1);
return em2820_write_regs(dev, YMAX_REG, &ymax, 1);
}
int em2820_capture_area_set(struct em2820 *dev, u8 hstart, u8 vstart,
u16 width, u16 height)
{
u8 cwidth = width;
u8 cheight = height;
u8 overflow = (height >> 7 & 0x02) | (width >> 8 & 0x01);
em2820_coredbg("em2820 Area Set: (%d,%d)\n", (width | (overflow & 2) << 7),
(height | (overflow & 1) << 8));
em2820_write_regs(dev, HSTART_REG, &hstart, 1);
em2820_write_regs(dev, VSTART_REG, &vstart, 1);
em2820_write_regs(dev, CWIDTH_REG, &cwidth, 1);
em2820_write_regs(dev, CHEIGHT_REG, &cheight, 1);
return em2820_write_regs(dev, OFLOW_REG, &overflow, 1);
}
int em2820_scaler_set(struct em2820 *dev, u16 h, u16 v)
{
u8 buf[2];
buf[0] = h;
buf[1] = h >> 8;
em2820_write_regs(dev, HSCALELOW_REG, (char *)buf, 2);
buf[0] = v;
buf[1] = v >> 8;
em2820_write_regs(dev, VSCALELOW_REG, (char *)buf, 2);
/* when H and V mixershould be used? */
/* return em2820_write_reg_bits(dev, COMPR_REG, (h ? 0x20 : 0x00) | (v ? 0x10 : 0x00), 0x30); */
/* it seems that both H and V scalers must be active to work correctly */
return em2820_write_reg_bits(dev, COMPR_REG, h
|| v ? 0x30 : 0x00, 0x30);
}
/* FIXME: this only function read values from dev */
int em2820_resolution_set(struct em2820 *dev)
{
int width, height;
width = norm_maxw(dev);
height = norm_maxh(dev) >> 1;
em2820_outfmt_set_yuv422(dev);
em2820_accumulator_set(dev, 1, (width - 4) >> 2, 1, (height - 4) >> 2);
em2820_capture_area_set(dev, 0, 0, width >> 2, height >> 2);
return em2820_scaler_set(dev, dev->hscale, dev->vscale);
}
/******************* isoc transfer handling ****************************/
#ifdef ENABLE_DEBUG_ISOC_FRAMES
static void em2820_isoc_dump(struct urb *urb, struct pt_regs *regs)
{
int len = 0;
int ntrans = 0;
int i;
printk(KERN_DEBUG "isocIrq: sf=%d np=%d ec=%x\n",
urb->start_frame, urb->number_of_packets,
urb->error_count);
for (i = 0; i < urb->number_of_packets; i++) {
unsigned char *buf =
urb->transfer_buffer +
urb->iso_frame_desc[i].offset;
int alen = urb->iso_frame_desc[i].actual_length;
if (alen > 0) {
if (buf[0] == 0x88) {
ntrans++;
len += alen;
} else if (buf[0] == 0x22) {
printk(KERN_DEBUG
"= l=%d nt=%d bpp=%d\n",
len - 4 * ntrans, ntrans,
ntrans == 0 ? 0 : len / ntrans);
ntrans = 1;
len = alen;
} else
printk(KERN_DEBUG "!\n");
}
printk(KERN_DEBUG " n=%d s=%d al=%d %x\n", i,
urb->iso_frame_desc[i].status,
urb->iso_frame_desc[i].actual_length,
(unsigned int)
*((unsigned char *)(urb->transfer_buffer +
urb->iso_frame_desc[i].
offset)));
}
}
#endif
static inline int em2820_isoc_video(struct em2820 *dev,struct em2820_frame_t **f,
unsigned long *lock_flags, unsigned char buf)
{
if (!(buf & 0x01)) {
if ((*f)->state == F_GRABBING) {
/*previous frame is incomplete */
if ((*f)->fieldbytesused < dev->field_size) {
(*f)->state = F_ERROR;
em2820_isocdbg ("dropping incomplete bottom field (%i missing bytes)",
dev->field_size-(*f)->fieldbytesused);
} else {
(*f)->state = F_DONE;
(*f)->buf.bytesused = dev->frame_size;
}
}
if ((*f)->state == F_DONE || (*f)->state == F_ERROR) {
/* move current frame to outqueue and get next free buffer from inqueue */
spin_lock_irqsave(&dev-> queue_lock, *lock_flags);
list_move_tail(&(*f)->frame, &dev->outqueue);
if (!list_empty(&dev->inqueue))
(*f) = list_entry(dev-> inqueue.next,
struct em2820_frame_t,frame);
else
(*f) = NULL;
spin_unlock_irqrestore(&dev->queue_lock,*lock_flags);
}
if (!(*f)) {
em2820_isocdbg ("new frame but no buffer is free");
return -1;
}
do_gettimeofday(&(*f)->buf.timestamp);
(*f)->buf.sequence = ++dev->frame_count;
(*f)->buf.field = V4L2_FIELD_INTERLACED;
(*f)->state = F_GRABBING;
(*f)->buf.bytesused = 0;
(*f)->top_field = 1;
(*f)->fieldbytesused = 0;
} else {
/* acquiring bottom field */
if ((*f)->state == F_GRABBING) {
if (!(*f)->top_field) {
(*f)->state = F_ERROR;
em2820_isocdbg ("unexpected begin of bottom field; discarding it");
} else if ((*f)-> fieldbytesused < dev->field_size - 172) {
(*f)->state = F_ERROR;
em2820_isocdbg ("dropping incomplete top field (%i missing bytes)",
dev->field_size-(*f)->fieldbytesused);
} else {
(*f)->top_field = 0;
(*f)->fieldbytesused = 0;
}
}
}
return (0);
}
static inline void em2820_isoc_video_copy(struct em2820 *dev,
struct em2820_frame_t **f, unsigned char *buf, int len)
{
void *fieldstart, *startwrite, *startread;
int linesdone, currlinedone, offset, lencopy,remain;
if ((*f)->fieldbytesused + len > dev->field_size)
len =dev->field_size - (*f)->fieldbytesused;
remain = len;
startread = buf + 4;
if ((*f)->top_field)
fieldstart = (*f)->bufmem;
else
fieldstart = (*f)->bufmem + dev->bytesperline;
linesdone = (*f)->fieldbytesused / dev->bytesperline;
currlinedone = (*f)->fieldbytesused % dev->bytesperline;
offset = linesdone * dev->bytesperline * 2 + currlinedone;
startwrite = fieldstart + offset;
lencopy = dev->bytesperline - currlinedone;
lencopy = lencopy > remain ? remain : lencopy;
memcpy(startwrite, startread, lencopy);
remain -= lencopy;
while (remain > 0) {
startwrite += lencopy + dev->bytesperline;
startread += lencopy;
if (dev->bytesperline > remain)
lencopy = remain;
else
lencopy = dev->bytesperline;
memcpy(startwrite, startread, lencopy);
remain -= lencopy;
}
(*f)->fieldbytesused += len;
}
/*
* em2820_isoIrq()
* handles the incoming isoc urbs and fills the frames from our inqueue
*/
void em2820_isocIrq(struct urb *urb, struct pt_regs *regs)
{
struct em2820 *dev = urb->context;
int i, status;
struct em2820_frame_t **f;
unsigned long lock_flags;
if (!dev)
return;
#ifdef ENABLE_DEBUG_ISOC_FRAMES
if (isoc_debug>1)
em2820_isoc_dump(urb, regs);
#endif
if (urb->status == -ENOENT)
return;
f = &dev->frame_current;
if (dev->stream == STREAM_INTERRUPT) {
dev->stream = STREAM_OFF;
if ((*f))
(*f)->state = F_QUEUED;
em2820_isocdbg("stream interrupted");
wake_up_interruptible(&dev->wait_stream);
}
if ((dev->state & DEV_DISCONNECTED) || (dev->state & DEV_MISCONFIGURED))
return;
if (dev->stream == STREAM_ON && !list_empty(&dev->inqueue)) {
if (!(*f))
(*f) = list_entry(dev->inqueue.next,
struct em2820_frame_t, frame);
for (i = 0; i < urb->number_of_packets; i++) {
unsigned char *buf = urb->transfer_buffer +
urb->iso_frame_desc[i].offset;
int len = urb->iso_frame_desc[i].actual_length - 4;
if (urb->iso_frame_desc[i].status) {
em2820_isocdbg("data error: [%d] len=%d, status=%d", i,
urb->iso_frame_desc[i].actual_length,
urb->iso_frame_desc[i].status);
continue;
}
if (urb->iso_frame_desc[i].actual_length <= 0) {
em2820_isocdbg("packet %d is empty",i);
continue;
}
if (urb->iso_frame_desc[i].actual_length >
dev->max_pkt_size) {
em2820_isocdbg("packet bigger than packet size");
continue;
}
/*new frame */
if (buf[0] == 0x22 && buf[1] == 0x5a) {
em2820_isocdbg("Video frame, length=%i!",len);
if (em2820_isoc_video(dev,f,&lock_flags,buf[2]))
break;
} else if (buf[0]==0x33 && buf[1]==0x95 && buf[2]==0x00) {
em2820_isocdbg("VBI HEADER!!!");
}
/* actual copying */
if ((*f)->state == F_GRABBING) {
em2820_isoc_video_copy(dev,f,buf, len);
}
}
}
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;
if ((status = usb_submit_urb(urb, GFP_ATOMIC))) {
em2820_errdev("resubmit of urb failed (error=%i)\n", status);
dev->state |= DEV_MISCONFIGURED;
}
wake_up_interruptible(&dev->wait_frame);
return;
}
/*
* em2820_uninit_isoc()
* deallocates the buffers and urbs allocated during em2820_init_iosc()
*/
void em2820_uninit_isoc(struct em2820 *dev)
{
int i;
for (i = 0; i < EM2820_NUM_BUFS; i++) {
if (dev->urb[i]) {
usb_kill_urb(dev->urb[i]);
usb_free_urb(dev->urb[i]);
}
dev->urb[i] = NULL;
if (dev->transfer_buffer[i])
kfree(dev->transfer_buffer[i]);
dev->transfer_buffer[i] = NULL;
}
em2820_capture_start(dev, 0);
}
/*
* em2820_init_isoc()
* allocates transfer buffers and submits the urbs for isoc transfer
*/
int em2820_init_isoc(struct em2820 *dev)
{
/* change interface to 3 which allowes the biggest packet sizes */
int i, errCode;
const int sb_size = EM2820_NUM_PACKETS * dev->max_pkt_size;
/* reset streaming vars */
dev->frame_current = NULL;
dev->frame_count = 0;
/* allocate urbs */
for (i = 0; i < EM2820_NUM_BUFS; i++) {
struct urb *urb;
int j, k;
/* allocate transfer buffer */
dev->transfer_buffer[i] = kmalloc(sb_size, GFP_KERNEL);
if (!dev->transfer_buffer[i]) {
em2820_errdev
("unable to allocate %i bytes for transfer buffer %i\n",
sb_size, i);
em2820_uninit_isoc(dev);
return -ENOMEM;
}
memset(dev->transfer_buffer[i], 0, sb_size);
urb = usb_alloc_urb(EM2820_NUM_PACKETS, GFP_KERNEL);
if (urb) {
urb->dev = dev->udev;
urb->context = dev;
urb->pipe = usb_rcvisocpipe(dev->udev, 0x82);
urb->transfer_flags = URB_ISO_ASAP;
urb->interval = 1;
urb->transfer_buffer = dev->transfer_buffer[i];
urb->complete = em2820_isocIrq;
urb->number_of_packets = EM2820_NUM_PACKETS;
urb->transfer_buffer_length = sb_size;
for (j = k = 0; j < EM2820_NUM_PACKETS;
j++, k += dev->max_pkt_size) {
urb->iso_frame_desc[j].offset = k;
urb->iso_frame_desc[j].length =
dev->max_pkt_size;
}
dev->urb[i] = urb;
} else {
em2820_errdev("cannot alloc urb %i\n", i);
em2820_uninit_isoc(dev);
return -ENOMEM;
}
}
/* submit urbs */
for (i = 0; i < EM2820_NUM_BUFS; i++) {
errCode = usb_submit_urb(dev->urb[i], GFP_KERNEL);
if (errCode) {
em2820_errdev("submit of urb %i failed (error=%i)\n", i,
errCode);
em2820_uninit_isoc(dev);
return errCode;
}
}
return 0;
}
int em2820_set_alternate(struct em2820 *dev)
{
int errCode, prev_alt = dev->alt;
dev->alt = alt;
if (dev->alt == 0) {
int i;
unsigned int min_pkt_size = dev->field_size / 137; /* FIXME: empiric magic number */
em2820_coredbg("minimum isoc packet size: %u", min_pkt_size);
dev->alt = 7;
for (i = 1; i < EM2820_MAX_ALT; i += 2) /* FIXME: skip even alternate: why do they not work? */
if (dev->alt_max_pkt_size[i] >= min_pkt_size) {
dev->alt = i;
break;
}
}
if (dev->alt != prev_alt) {
dev->max_pkt_size = dev->alt_max_pkt_size[dev->alt];
em2820_coredbg("setting alternate %d with wMaxPacketSize=%u", dev->alt,
dev->max_pkt_size);
errCode = usb_set_interface(dev->udev, 0, dev->alt);
if (errCode < 0) {
em2820_errdev
("cannot change alternate number to %d (error=%i)\n",
dev->alt, errCode);
return errCode;
}
}
return 0;
}
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