diff options
Diffstat (limited to 'drivers/media/video/em28xx/em28xx-core.c')
| -rw-r--r-- | drivers/media/video/em28xx/em28xx-core.c | 817 |
1 files changed, 817 insertions, 0 deletions
diff --git a/drivers/media/video/em28xx/em28xx-core.c b/drivers/media/video/em28xx/em28xx-core.c new file mode 100644 index 000000000000..d54bc0127484 --- /dev/null +++ b/drivers/media/video/em28xx/em28xx-core.c @@ -0,0 +1,817 @@ +/* + 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@brturbo.com.br> + 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 */ + +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, __FUNCTION__ , ##arg); } while (0) + +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, __FUNCTION__ , ##arg); } while (0) + +unsigned int isoc_debug; +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"); + +/* ------------------------------------------------------------------ */ +/* 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 em28xx_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); +} + +/* + * 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 %i", count, imagesize); + if (count > EM28XX_NUM_FRAMES) + count = EM28XX_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; +} + +/* + * 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) { + rvfree(dev->frame[0].bufmem, + dev->num_frames * PAGE_ALIGN(dev->frame[0].buf.length)); + 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; + + 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; + + 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 = 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); + mdelay(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 exectuted: 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); +} + +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); +} + +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); +} + +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, 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 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 + */ +void em28xx_isocIrq(struct urb *urb, struct pt_regs *regs) +{ + 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, 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; + 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; +} |