123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140141142143144145146147148149150151152153154155156157158159160161162163164165166167168169170171172173174175176177178179180181182183184185186187188189190191192193194195196197198199200201202203204205206207208209210211212213214215216217218219220221222223224225226227228229230231232233234235236237238239240241242243244245246247248249250251252253254255256257258259260261262263264265266267268269270271272273274275276277278279280281282283284285286287288289290291292293294295296297298299300301302303304305306307308309310311312313314315316317318319320321322323324325326327328329330331332333334335336337338339340341342343344345346347348349350351352353354355356357358359360361362363364365366367368369370371372373374375376377378379380381382383384385386387388389390391392393394395396397398399400401402403404405406407408409410411412413414415416417418419420421422423424425426427428429430431432433434435436437438439440441442443444445446447448449450451452453454455456457458459460461462463464465466467468469470471472473474475476477478479480481482483484485486487488489490491492493494495496497498499500501502503504505506507508509510511512513514515516517518519520521522523524525526527528529530531532533534535536537538539540541542543544545546547548549550551552553554555556557558559560561562563564565566567568569570571572573574575576577578579580581582583584585586587588589590591592593594595596597598599600601602603604605606607608609610611612613614615616617618619620621622623624625626627628629630631632633634635636637638639640641642643644645646647648649650651652653654655656657658659660661662663664665666667668669670671672673674675676677678679680681682683684685686687688689690691692693694695696697698699700701702703704705706707708709710711712713714715716717718719720721722723724725726727728729730731732733734735 |
- /*
- 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;
- }
|