Techwizz/kernel-fxtec-pro1x
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity
kernel-fxtec-pro1x/drivers/media/video/em28xx/em28xx-core.c
David Howells 7d12e780e0 IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.

The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around.  On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).

Where appropriate, an arch may override the generic storage facility and do
something different with the variable.  On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.

Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions.  Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller.  A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.

I've build this code with allyesconfig for x86_64 and i386.  I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.

This will affect all archs.  Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:

	struct pt_regs *old_regs = set_irq_regs(regs);

And put the old one back at the end:

	set_irq_regs(old_regs);

Don't pass regs through to generic_handle_irq() or __do_IRQ().

In timer_interrupt(), this sort of change will be necessary:

	-	update_process_times(user_mode(regs));
	-	profile_tick(CPU_PROFILING, regs);
	+	update_process_times(user_mode(get_irq_regs()));
	+	profile_tick(CPU_PROFILING);

I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().

Some notes on the interrupt handling in the drivers:

 (*) input_dev() is now gone entirely.  The regs pointer is no longer stored in
     the input_dev struct.

 (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking.  It does
     something different depending on whether it's been supplied with a regs
     pointer or not.

 (*) Various IRQ handler function pointers have been moved to type
     irq_handler_t.

Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 15:10:12 +01:00

735 lines
20 KiB
C
Raw Blame History

/*
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/moduleparam.h>
#include <linux/usb.h>
#include <linux/vmalloc.h>
#include "em28xx.h"
/* #define ENABLE_DEBUG_ISOC_FRAMES */
static unsigned int core_debug = 0;
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, __FUNCTION__ , ##arg); } while (0)
static unsigned int reg_debug = 0;
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, __FUNCTION__ , ##arg); } while (0)
static unsigned int isoc_debug = 0;
module_param(isoc_debug,int,0644);
MODULE_PARM_DESC(isoc_debug,"enable debug messages [isoc transfers]");
#define em28xx_isocdbg(fmt, arg...) do {\
if (isoc_debug) \
printk(KERN_INFO "%s %s :"fmt, \
dev->name, __FUNCTION__ , ##arg); } while (0)
static int alt = EM28XX_PINOUT;
module_param(alt, int, 0644);
MODULE_PARM_DESC(alt, "alternate setting to use for video endpoint");
/*
* em28xx_request_buffers()
* allocate a number of buffers
*/
u32 em28xx_request_buffers(struct em28xx *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;
em28xx_coredbg("requested %i buffers with size %zi", count, imagesize);
if (count > EM28XX_NUM_FRAMES)
count = EM28XX_NUM_FRAMES;
dev->num_frames = count;
while (dev->num_frames > 0) {
if ((buff = vmalloc_32(dev->num_frames * imagesize))) {
memset(buff, 0, 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;
}
/*
* em28xx_queue_unusedframes()
* add all frames that are not currently in use to the inbuffer queue
*/
void em28xx_queue_unusedframes(struct em28xx *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);
}
}
/*
* em28xx_release_buffers()
* free frame buffers
*/
void em28xx_release_buffers(struct em28xx *dev)
{
if (dev->num_frames) {
vfree(dev->frame[0].bufmem);
dev->num_frames = 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(" %02x", buf[byte]);
}
printk("\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", 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 (" %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);
msleep(5); /* FIXME: magic number */
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
*/
int em28xx_write_reg_bits(struct em28xx *dev, u16 reg, u8 val,
u8 bitmask)
{
int oldval;
u8 newval;
if ((oldval = em28xx_read_reg(dev, reg)) < 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!)
*/
int em28xx_write_ac97(struct em28xx *dev, u8 reg, u8 * val)
{
int ret;
u8 addr = reg & 0x7f;
if ((ret = em28xx_write_regs(dev, AC97LSB_REG, val, 2)) < 0)
return ret;
if ((ret = em28xx_write_regs(dev, AC97ADDR_REG, &addr, 1)) < 0)
return ret;
if ((ret = em28xx_read_reg(dev, AC97BUSY_REG)) < 0)
return ret;
else if (((u8) ret) & 0x01) {
em28xx_warn ("AC97 command still being executed: not handled properly!\n");
}
return 0;
}
int em28xx_audio_analog_set(struct em28xx *dev)
{
char s[2] = { 0x00, 0x00 };
s[0] |= 0x1f - dev->volume;
s[1] |= 0x1f - dev->volume;
if (dev->mute)
s[1] |= 0x80;
return em28xx_write_ac97(dev, MASTER_AC97, s);
}
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 ret;
/* FIXME: which is the best order? */
/* video registers are sampled by VREF */
if ((ret = em28xx_write_reg_bits(dev, USBSUSP_REG, start ? 0x10 : 0x00,
0x10)) < 0)
return ret;
/* enable video capture */
return em28xx_write_regs(dev, VINENABLE_REG, start ? "\x67" : "\x27", 1);
}
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);
}
/******************* isoc transfer handling ****************************/
#ifdef ENABLE_DEBUG_ISOC_FRAMES
static void em28xx_isoc_dump(struct urb *urb)
{
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 em28xx_isoc_video(struct em28xx *dev,struct em28xx_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;
em28xx_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 em28xx_frame_t,frame);
else
(*f) = NULL;
spin_unlock_irqrestore(&dev->queue_lock,*lock_flags);
}
if (!(*f)) {
em28xx_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;
em28xx_isocdbg ("unexpected begin of bottom field; discarding it");
} else if ((*f)-> fieldbytesused < dev->field_size - 172) {
(*f)->state = F_ERROR;
em28xx_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 em28xx_isoc_video_copy(struct em28xx *dev,
struct em28xx_frame_t **f, unsigned char *buf, int len)
{
void *fieldstart, *startwrite, *startread;
int linesdone, currlinedone, offset, lencopy,remain;
if(dev->frame_size != (*f)->buf.length){
em28xx_err("frame_size %i and buf.length %i are different!!!\n",dev->frame_size,(*f)->buf.length);
return;
}
if ((*f)->fieldbytesused + len > dev->field_size)
len =dev->field_size - (*f)->fieldbytesused;
if (buf[0] != 0x88 && buf[0] != 0x22) {
em28xx_isocdbg("frame is not complete\n");
startread = buf;
len+=4;
} else
startread = buf + 4;
remain = len;
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;
}
/*
* em28xx_isoIrq()
* handles the incoming isoc urbs and fills the frames from our inqueue
*/
static void em28xx_isocIrq(struct urb *urb)
{
struct em28xx *dev = urb->context;
int i, status;
struct em28xx_frame_t **f;
unsigned long lock_flags;
if (!dev)
return;
#ifdef ENABLE_DEBUG_ISOC_FRAMES
if (isoc_debug>1)
em28xx_isoc_dump(urb);
#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;
em28xx_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 em28xx_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) {
em28xx_isocdbg("data error: [%d] len=%d, status=%d", i,
urb->iso_frame_desc[i].actual_length,
urb->iso_frame_desc[i].status);
if (urb->iso_frame_desc[i].status != -EPROTO)
continue;
}
if (urb->iso_frame_desc[i].actual_length <= 0) {
em28xx_isocdbg("packet %d is empty",i);
continue;
}
if (urb->iso_frame_desc[i].actual_length >
dev->max_pkt_size) {
em28xx_isocdbg("packet bigger than packet size");
continue;
}
/*new frame */
if (buf[0] == 0x22 && buf[1] == 0x5a) {
em28xx_isocdbg("Video frame, length=%i!",len);
if (em28xx_isoc_video(dev,f,&lock_flags,buf[2]))
break;
} else if (buf[0]==0x33 && buf[1]==0x95 && buf[2]==0x00) {
em28xx_isocdbg("VBI HEADER!!!");
}
/* actual copying */
if ((*f)->state == F_GRABBING) {
em28xx_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))) {
em28xx_errdev("resubmit of urb failed (error=%i)\n", status);
dev->state |= DEV_MISCONFIGURED;
}
wake_up_interruptible(&dev->wait_frame);
return;
}
/*
* em28xx_uninit_isoc()
* deallocates the buffers and urbs allocated during em28xx_init_iosc()
*/
void em28xx_uninit_isoc(struct em28xx *dev)
{
int i;
for (i = 0; i < EM28XX_NUM_BUFS; i++) {
if (dev->urb[i]) {
usb_kill_urb(dev->urb[i]);
if (dev->transfer_buffer[i]){
usb_buffer_free(dev->udev,(EM28XX_NUM_PACKETS*dev->max_pkt_size),dev->transfer_buffer[i],dev->urb[i]->transfer_dma);
}
usb_free_urb(dev->urb[i]);
}
dev->urb[i] = NULL;
dev->transfer_buffer[i] = NULL;
}
em28xx_capture_start(dev, 0);
}
/*
* em28xx_init_isoc()
* allocates transfer buffers and submits the urbs for isoc transfer
*/
int em28xx_init_isoc(struct em28xx *dev)
{
/* change interface to 3 which allowes the biggest packet sizes */
int i, errCode;
const int sb_size = EM28XX_NUM_PACKETS * dev->max_pkt_size;
/* reset streaming vars */
dev->frame_current = NULL;
dev->frame_count = 0;
/* allocate urbs */
for (i = 0; i < EM28XX_NUM_BUFS; i++) {
struct urb *urb;
int j, k;
/* allocate transfer buffer */
urb = usb_alloc_urb(EM28XX_NUM_PACKETS, GFP_KERNEL);
if (!urb){
em28xx_errdev("cannot alloc urb %i\n", i);
em28xx_uninit_isoc(dev);
return -ENOMEM;
}
dev->transfer_buffer[i] = usb_buffer_alloc(dev->udev, sb_size, GFP_KERNEL,&urb->transfer_dma);
if (!dev->transfer_buffer[i]) {
em28xx_errdev
("unable to allocate %i bytes for transfer buffer %i\n",
sb_size, i);
em28xx_uninit_isoc(dev);
return -ENOMEM;
}
memset(dev->transfer_buffer[i], 0, sb_size);
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 = em28xx_isocIrq;
urb->number_of_packets = EM28XX_NUM_PACKETS;
urb->transfer_buffer_length = sb_size;
for (j = k = 0; j < EM28XX_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;
}
/* submit urbs */
for (i = 0; i < EM28XX_NUM_BUFS; i++) {
errCode = usb_submit_urb(dev->urb[i], GFP_KERNEL);
if (errCode) {
em28xx_errdev("submit of urb %i failed (error=%i)\n", i,
errCode);
em28xx_uninit_isoc(dev);
return errCode;
}
}
return 0;
}
int em28xx_set_alternate(struct em28xx *dev)
{
int errCode, prev_alt = dev->alt;
dev->alt = alt;
if (dev->alt == 0) {
int i;
for(i=0;i< dev->num_alt; i++)
if(dev->alt_max_pkt_size[i]>dev->alt_max_pkt_size[dev->alt])
dev->alt=i;
}
if (dev->alt != prev_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;
}
Reference in a new issue View git blame Copy permalink