![Markus Rechberger](/assets/img/avatar_default.png)
fixed i2c return value, conversion mdelay to msleep Signed-off-by: Markus Rechberger <mrechberger@gmail.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
736 lines
20 KiB
C
736 lines
20 KiB
C
/*
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em28xx-core.c - driver for Empia EM2800/EM2820/2840 USB video capture devices
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Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it>
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Markus Rechberger <mrechberger@gmail.com>
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Mauro Carvalho Chehab <mchehab@brturbo.com.br>
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Sascha Sommer <saschasommer@freenet.de>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/init.h>
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#include <linux/list.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/usb.h>
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#include <linux/vmalloc.h>
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#include "em28xx.h"
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/* #define ENABLE_DEBUG_ISOC_FRAMES */
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static unsigned int core_debug = 0;
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module_param(core_debug,int,0644);
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MODULE_PARM_DESC(core_debug,"enable debug messages [core]");
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#define em28xx_coredbg(fmt, arg...) do {\
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if (core_debug) \
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printk(KERN_INFO "%s %s :"fmt, \
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dev->name, __FUNCTION__ , ##arg); } while (0)
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static unsigned int reg_debug = 0;
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module_param(reg_debug,int,0644);
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MODULE_PARM_DESC(reg_debug,"enable debug messages [URB reg]");
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#define em28xx_regdbg(fmt, arg...) do {\
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if (reg_debug) \
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printk(KERN_INFO "%s %s :"fmt, \
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dev->name, __FUNCTION__ , ##arg); } while (0)
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static unsigned int isoc_debug = 0;
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module_param(isoc_debug,int,0644);
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MODULE_PARM_DESC(isoc_debug,"enable debug messages [isoc transfers]");
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#define em28xx_isocdbg(fmt, arg...) do {\
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if (isoc_debug) \
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printk(KERN_INFO "%s %s :"fmt, \
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dev->name, __FUNCTION__ , ##arg); } while (0)
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static int alt = EM28XX_PINOUT;
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module_param(alt, int, 0644);
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MODULE_PARM_DESC(alt, "alternate setting to use for video endpoint");
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/*
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* em28xx_request_buffers()
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* allocate a number of buffers
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*/
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u32 em28xx_request_buffers(struct em28xx *dev, u32 count)
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{
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const size_t imagesize = PAGE_ALIGN(dev->frame_size); /*needs to be page aligned cause the buffers can be mapped individually! */
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void *buff = NULL;
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u32 i;
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em28xx_coredbg("requested %i buffers with size %zi", count, imagesize);
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if (count > EM28XX_NUM_FRAMES)
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count = EM28XX_NUM_FRAMES;
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dev->num_frames = count;
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while (dev->num_frames > 0) {
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if ((buff = vmalloc_32(dev->num_frames * imagesize))) {
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memset(buff, 0, dev->num_frames * imagesize);
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break;
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}
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dev->num_frames--;
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}
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for (i = 0; i < dev->num_frames; i++) {
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dev->frame[i].bufmem = buff + i * imagesize;
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dev->frame[i].buf.index = i;
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dev->frame[i].buf.m.offset = i * imagesize;
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dev->frame[i].buf.length = dev->frame_size;
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dev->frame[i].buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
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dev->frame[i].buf.sequence = 0;
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dev->frame[i].buf.field = V4L2_FIELD_NONE;
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dev->frame[i].buf.memory = V4L2_MEMORY_MMAP;
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dev->frame[i].buf.flags = 0;
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}
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return dev->num_frames;
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}
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/*
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* em28xx_queue_unusedframes()
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* add all frames that are not currently in use to the inbuffer queue
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*/
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void em28xx_queue_unusedframes(struct em28xx *dev)
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{
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unsigned long lock_flags;
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u32 i;
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for (i = 0; i < dev->num_frames; i++)
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if (dev->frame[i].state == F_UNUSED) {
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dev->frame[i].state = F_QUEUED;
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spin_lock_irqsave(&dev->queue_lock, lock_flags);
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list_add_tail(&dev->frame[i].frame, &dev->inqueue);
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spin_unlock_irqrestore(&dev->queue_lock, lock_flags);
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}
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}
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/*
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* em28xx_release_buffers()
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* free frame buffers
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*/
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void em28xx_release_buffers(struct em28xx *dev)
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{
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if (dev->num_frames) {
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vfree(dev->frame[0].bufmem);
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dev->num_frames = 0;
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}
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}
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/*
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* em28xx_read_reg_req()
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* reads data from the usb device specifying bRequest
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*/
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int em28xx_read_reg_req_len(struct em28xx *dev, u8 req, u16 reg,
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char *buf, int len)
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{
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int ret, byte;
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if (dev->state & DEV_DISCONNECTED)
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return(-ENODEV);
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em28xx_regdbg("req=%02x, reg=%02x ", req, reg);
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ret = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0), req,
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USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
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0x0000, reg, buf, len, HZ);
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if (reg_debug){
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printk(ret < 0 ? " failed!\n" : "%02x values: ", ret);
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for (byte = 0; byte < len; byte++) {
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printk(" %02x", buf[byte]);
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}
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printk("\n");
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}
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return ret;
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}
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/*
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* em28xx_read_reg_req()
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* reads data from the usb device specifying bRequest
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*/
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int em28xx_read_reg_req(struct em28xx *dev, u8 req, u16 reg)
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{
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u8 val;
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int ret;
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if (dev->state & DEV_DISCONNECTED)
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return(-ENODEV);
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em28xx_regdbg("req=%02x, reg=%02x:", req, reg);
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ret = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0), req,
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USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
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0x0000, reg, &val, 1, HZ);
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if (reg_debug)
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printk(ret < 0 ? " failed!\n" : "%02x\n", val);
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if (ret < 0)
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return ret;
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return val;
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}
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int em28xx_read_reg(struct em28xx *dev, u16 reg)
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{
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return em28xx_read_reg_req(dev, USB_REQ_GET_STATUS, reg);
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}
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/*
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* em28xx_write_regs_req()
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* sends data to the usb device, specifying bRequest
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*/
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int em28xx_write_regs_req(struct em28xx *dev, u8 req, u16 reg, char *buf,
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int len)
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{
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int ret;
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/*usb_control_msg seems to expect a kmalloced buffer */
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unsigned char *bufs;
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if (dev->state & DEV_DISCONNECTED)
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return(-ENODEV);
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bufs = kmalloc(len, GFP_KERNEL);
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em28xx_regdbg("req=%02x reg=%02x:", req, reg);
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if (reg_debug) {
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int i;
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for (i = 0; i < len; ++i)
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printk (" %02x", (unsigned char)buf[i]);
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printk ("\n");
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}
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if (!bufs)
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return -ENOMEM;
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memcpy(bufs, buf, len);
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ret = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0), req,
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USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
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0x0000, reg, bufs, len, HZ);
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msleep(5); /* FIXME: magic number */
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kfree(bufs);
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return ret;
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}
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int em28xx_write_regs(struct em28xx *dev, u16 reg, char *buf, int len)
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{
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return em28xx_write_regs_req(dev, USB_REQ_GET_STATUS, reg, buf, len);
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}
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/*
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* em28xx_write_reg_bits()
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* sets only some bits (specified by bitmask) of a register, by first reading
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* the actual value
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*/
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int em28xx_write_reg_bits(struct em28xx *dev, u16 reg, u8 val,
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u8 bitmask)
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{
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int oldval;
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u8 newval;
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if ((oldval = em28xx_read_reg(dev, reg)) < 0)
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return oldval;
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newval = (((u8) oldval) & ~bitmask) | (val & bitmask);
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return em28xx_write_regs(dev, reg, &newval, 1);
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}
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/*
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* em28xx_write_ac97()
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* write a 16 bit value to the specified AC97 address (LSB first!)
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*/
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int em28xx_write_ac97(struct em28xx *dev, u8 reg, u8 * val)
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{
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int ret;
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u8 addr = reg & 0x7f;
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if ((ret = em28xx_write_regs(dev, AC97LSB_REG, val, 2)) < 0)
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return ret;
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if ((ret = em28xx_write_regs(dev, AC97ADDR_REG, &addr, 1)) < 0)
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return ret;
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if ((ret = em28xx_read_reg(dev, AC97BUSY_REG)) < 0)
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return ret;
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else if (((u8) ret) & 0x01) {
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em28xx_warn ("AC97 command still being executed: not handled properly!\n");
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}
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return 0;
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}
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int em28xx_audio_analog_set(struct em28xx *dev)
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{
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char s[2] = { 0x00, 0x00 };
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s[0] |= 0x1f - dev->volume;
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s[1] |= 0x1f - dev->volume;
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if (dev->mute)
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s[1] |= 0x80;
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return em28xx_write_ac97(dev, MASTER_AC97, s);
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}
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int em28xx_colorlevels_set_default(struct em28xx *dev)
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{
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em28xx_write_regs(dev, YGAIN_REG, "\x10", 1); /* contrast */
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em28xx_write_regs(dev, YOFFSET_REG, "\x00", 1); /* brightness */
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em28xx_write_regs(dev, UVGAIN_REG, "\x10", 1); /* saturation */
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em28xx_write_regs(dev, UOFFSET_REG, "\x00", 1);
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em28xx_write_regs(dev, VOFFSET_REG, "\x00", 1);
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em28xx_write_regs(dev, SHARPNESS_REG, "\x00", 1);
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em28xx_write_regs(dev, GAMMA_REG, "\x20", 1);
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em28xx_write_regs(dev, RGAIN_REG, "\x20", 1);
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em28xx_write_regs(dev, GGAIN_REG, "\x20", 1);
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em28xx_write_regs(dev, BGAIN_REG, "\x20", 1);
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em28xx_write_regs(dev, ROFFSET_REG, "\x00", 1);
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em28xx_write_regs(dev, GOFFSET_REG, "\x00", 1);
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return em28xx_write_regs(dev, BOFFSET_REG, "\x00", 1);
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}
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int em28xx_capture_start(struct em28xx *dev, int start)
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{
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int ret;
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/* FIXME: which is the best order? */
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/* video registers are sampled by VREF */
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if ((ret = em28xx_write_reg_bits(dev, USBSUSP_REG, start ? 0x10 : 0x00,
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0x10)) < 0)
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return ret;
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/* enable video capture */
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return em28xx_write_regs(dev, VINENABLE_REG, start ? "\x67" : "\x27", 1);
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}
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int em28xx_outfmt_set_yuv422(struct em28xx *dev)
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{
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em28xx_write_regs(dev, OUTFMT_REG, "\x34", 1);
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em28xx_write_regs(dev, VINMODE_REG, "\x10", 1);
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return em28xx_write_regs(dev, VINCTRL_REG, "\x11", 1);
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}
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int em28xx_accumulator_set(struct em28xx *dev, u8 xmin, u8 xmax, u8 ymin,
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u8 ymax)
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{
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em28xx_coredbg("em28xx Scale: (%d,%d)-(%d,%d)\n", xmin, ymin, xmax, ymax);
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em28xx_write_regs(dev, XMIN_REG, &xmin, 1);
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em28xx_write_regs(dev, XMAX_REG, &xmax, 1);
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em28xx_write_regs(dev, YMIN_REG, &ymin, 1);
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return em28xx_write_regs(dev, YMAX_REG, &ymax, 1);
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}
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int em28xx_capture_area_set(struct em28xx *dev, u8 hstart, u8 vstart,
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u16 width, u16 height)
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{
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u8 cwidth = width;
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u8 cheight = height;
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u8 overflow = (height >> 7 & 0x02) | (width >> 8 & 0x01);
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em28xx_coredbg("em28xx Area Set: (%d,%d)\n", (width | (overflow & 2) << 7),
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(height | (overflow & 1) << 8));
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em28xx_write_regs(dev, HSTART_REG, &hstart, 1);
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em28xx_write_regs(dev, VSTART_REG, &vstart, 1);
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em28xx_write_regs(dev, CWIDTH_REG, &cwidth, 1);
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em28xx_write_regs(dev, CHEIGHT_REG, &cheight, 1);
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return em28xx_write_regs(dev, OFLOW_REG, &overflow, 1);
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}
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int em28xx_scaler_set(struct em28xx *dev, u16 h, u16 v)
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{
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u8 mode;
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/* the em2800 scaler only supports scaling down to 50% */
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if(dev->is_em2800)
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mode = (v ? 0x20 : 0x00) | (h ? 0x10 : 0x00);
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else {
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u8 buf[2];
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buf[0] = h;
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buf[1] = h >> 8;
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em28xx_write_regs(dev, HSCALELOW_REG, (char *)buf, 2);
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buf[0] = v;
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buf[1] = v >> 8;
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em28xx_write_regs(dev, VSCALELOW_REG, (char *)buf, 2);
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/* it seems that both H and V scalers must be active to work correctly */
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mode = (h || v)? 0x30: 0x00;
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}
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return em28xx_write_reg_bits(dev, COMPR_REG, mode, 0x30);
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}
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/* FIXME: this only function read values from dev */
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int em28xx_resolution_set(struct em28xx *dev)
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{
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int width, height;
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width = norm_maxw(dev);
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height = norm_maxh(dev) >> 1;
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em28xx_outfmt_set_yuv422(dev);
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em28xx_accumulator_set(dev, 1, (width - 4) >> 2, 1, (height - 4) >> 2);
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em28xx_capture_area_set(dev, 0, 0, width >> 2, height >> 2);
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return em28xx_scaler_set(dev, dev->hscale, dev->vscale);
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}
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/******************* isoc transfer handling ****************************/
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#ifdef ENABLE_DEBUG_ISOC_FRAMES
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static void em28xx_isoc_dump(struct urb *urb, struct pt_regs *regs)
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{
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int len = 0;
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int ntrans = 0;
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int i;
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printk(KERN_DEBUG "isocIrq: sf=%d np=%d ec=%x\n",
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urb->start_frame, urb->number_of_packets,
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urb->error_count);
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for (i = 0; i < urb->number_of_packets; i++) {
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unsigned char *buf =
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urb->transfer_buffer +
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urb->iso_frame_desc[i].offset;
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int alen = urb->iso_frame_desc[i].actual_length;
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if (alen > 0) {
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if (buf[0] == 0x88) {
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ntrans++;
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len += alen;
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} else if (buf[0] == 0x22) {
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printk(KERN_DEBUG
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"= l=%d nt=%d bpp=%d\n",
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len - 4 * ntrans, ntrans,
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ntrans == 0 ? 0 : len / ntrans);
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ntrans = 1;
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len = alen;
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} else
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printk(KERN_DEBUG "!\n");
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}
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printk(KERN_DEBUG " n=%d s=%d al=%d %x\n", i,
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urb->iso_frame_desc[i].status,
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urb->iso_frame_desc[i].actual_length,
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(unsigned int)
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*((unsigned char *)(urb->transfer_buffer +
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urb->iso_frame_desc[i].
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offset)));
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}
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}
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#endif
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static inline int em28xx_isoc_video(struct em28xx *dev,struct em28xx_frame_t **f,
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unsigned long *lock_flags, unsigned char buf)
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{
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if (!(buf & 0x01)) {
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if ((*f)->state == F_GRABBING) {
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/*previous frame is incomplete */
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if ((*f)->fieldbytesused < dev->field_size) {
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(*f)->state = F_ERROR;
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em28xx_isocdbg ("dropping incomplete bottom field (%i missing bytes)",
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dev->field_size-(*f)->fieldbytesused);
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} else {
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(*f)->state = F_DONE;
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(*f)->buf.bytesused = dev->frame_size;
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}
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}
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if ((*f)->state == F_DONE || (*f)->state == F_ERROR) {
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/* move current frame to outqueue and get next free buffer from inqueue */
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spin_lock_irqsave(&dev-> queue_lock, *lock_flags);
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list_move_tail(&(*f)->frame, &dev->outqueue);
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if (!list_empty(&dev->inqueue))
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(*f) = list_entry(dev-> inqueue.next,
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struct em28xx_frame_t,frame);
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else
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(*f) = NULL;
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spin_unlock_irqrestore(&dev->queue_lock,*lock_flags);
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}
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if (!(*f)) {
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em28xx_isocdbg ("new frame but no buffer is free");
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return -1;
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}
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do_gettimeofday(&(*f)->buf.timestamp);
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(*f)->buf.sequence = ++dev->frame_count;
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(*f)->buf.field = V4L2_FIELD_INTERLACED;
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(*f)->state = F_GRABBING;
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(*f)->buf.bytesused = 0;
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(*f)->top_field = 1;
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(*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;
|
|
}
|