641 lines
16 KiB
C
641 lines
16 KiB
C
/*
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* cpia_usb CPiA USB driver
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*
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* Supports CPiA based parallel port Video Camera's.
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*
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* Copyright (C) 1999 Jochen Scharrlach <Jochen.Scharrlach@schwaben.de>
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* Copyright (C) 1999, 2000 Johannes Erdfelt <johannes@erdfelt.com>
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*
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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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*
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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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*
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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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/* define _CPIA_DEBUG_ for verbose debug output (see cpia.h) */
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/* #define _CPIA_DEBUG_ 1 */
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/wait.h>
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#include <linux/list.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <linux/usb.h>
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#include "cpia.h"
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#define USB_REQ_CPIA_GRAB_FRAME 0xC1
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#define USB_REQ_CPIA_UPLOAD_FRAME 0xC2
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#define WAIT_FOR_NEXT_FRAME 0
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#define FORCE_FRAME_UPLOAD 1
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#define FRAMES_PER_DESC 10
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#define FRAME_SIZE_PER_DESC 960 /* Shouldn't be hardcoded */
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#define CPIA_NUMSBUF 2
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#define STREAM_BUF_SIZE (PAGE_SIZE * 4)
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#define SCRATCH_BUF_SIZE (STREAM_BUF_SIZE * 2)
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struct cpia_sbuf {
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char *data;
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struct urb *urb;
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};
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#define FRAMEBUF_LEN (CPIA_MAX_FRAME_SIZE+100)
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enum framebuf_status {
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FRAME_EMPTY,
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FRAME_READING,
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FRAME_READY,
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FRAME_ERROR,
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};
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struct framebuf {
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int length;
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enum framebuf_status status;
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u8 data[FRAMEBUF_LEN];
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struct framebuf *next;
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};
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struct usb_cpia {
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/* Device structure */
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struct usb_device *dev;
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unsigned char iface;
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wait_queue_head_t wq_stream;
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int cursbuf; /* Current receiving sbuf */
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struct cpia_sbuf sbuf[CPIA_NUMSBUF]; /* Double buffering */
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int streaming;
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int open;
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int present;
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struct framebuf *buffers[3];
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struct framebuf *curbuff, *workbuff;
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};
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static int cpia_usb_open(void *privdata);
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static int cpia_usb_registerCallback(void *privdata, void (*cb) (void *cbdata),
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void *cbdata);
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static int cpia_usb_transferCmd(void *privdata, u8 *command, u8 *data);
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static int cpia_usb_streamStart(void *privdata);
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static int cpia_usb_streamStop(void *privdata);
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static int cpia_usb_streamRead(void *privdata, u8 *frame, int noblock);
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static int cpia_usb_close(void *privdata);
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#define ABOUT "USB driver for Vision CPiA based cameras"
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static struct cpia_camera_ops cpia_usb_ops = {
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cpia_usb_open,
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cpia_usb_registerCallback,
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cpia_usb_transferCmd,
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cpia_usb_streamStart,
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cpia_usb_streamStop,
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cpia_usb_streamRead,
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cpia_usb_close,
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0,
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THIS_MODULE
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};
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static LIST_HEAD(cam_list);
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static spinlock_t cam_list_lock_usb;
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static void cpia_usb_complete(struct urb *urb)
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{
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int i;
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char *cdata;
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struct usb_cpia *ucpia;
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if (!urb || !urb->context)
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return;
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ucpia = (struct usb_cpia *) urb->context;
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if (!ucpia->dev || !ucpia->streaming || !ucpia->present || !ucpia->open)
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return;
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if (ucpia->workbuff->status == FRAME_EMPTY) {
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ucpia->workbuff->status = FRAME_READING;
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ucpia->workbuff->length = 0;
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}
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for (i = 0; i < urb->number_of_packets; i++) {
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int n = urb->iso_frame_desc[i].actual_length;
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int st = urb->iso_frame_desc[i].status;
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cdata = urb->transfer_buffer + urb->iso_frame_desc[i].offset;
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if (st)
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printk(KERN_DEBUG "cpia data error: [%d] len=%d, status=%X\n", i, n, st);
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if (FRAMEBUF_LEN < ucpia->workbuff->length + n) {
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printk(KERN_DEBUG "cpia: scratch buf overflow!scr_len: %d, n: %d\n", ucpia->workbuff->length, n);
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return;
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}
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if (n) {
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if ((ucpia->workbuff->length > 0) ||
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(0x19 == cdata[0] && 0x68 == cdata[1])) {
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memcpy(ucpia->workbuff->data + ucpia->workbuff->length, cdata, n);
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ucpia->workbuff->length += n;
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} else
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DBG("Ignoring packet!\n");
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} else {
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if (ucpia->workbuff->length > 4 &&
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0xff == ucpia->workbuff->data[ucpia->workbuff->length-1] &&
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0xff == ucpia->workbuff->data[ucpia->workbuff->length-2] &&
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0xff == ucpia->workbuff->data[ucpia->workbuff->length-3] &&
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0xff == ucpia->workbuff->data[ucpia->workbuff->length-4]) {
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ucpia->workbuff->status = FRAME_READY;
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ucpia->curbuff = ucpia->workbuff;
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ucpia->workbuff = ucpia->workbuff->next;
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ucpia->workbuff->status = FRAME_EMPTY;
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ucpia->workbuff->length = 0;
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if (waitqueue_active(&ucpia->wq_stream))
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wake_up_interruptible(&ucpia->wq_stream);
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}
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}
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}
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/* resubmit */
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urb->dev = ucpia->dev;
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if ((i = usb_submit_urb(urb, GFP_ATOMIC)) != 0)
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printk(KERN_ERR "%s: usb_submit_urb ret %d\n", __func__, i);
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}
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static int cpia_usb_open(void *privdata)
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{
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struct usb_cpia *ucpia = (struct usb_cpia *) privdata;
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struct urb *urb;
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int ret, retval = 0, fx, err;
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if (!ucpia)
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return -EINVAL;
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ucpia->sbuf[0].data = kmalloc(FRAMES_PER_DESC * FRAME_SIZE_PER_DESC, GFP_KERNEL);
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if (!ucpia->sbuf[0].data)
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return -EINVAL;
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ucpia->sbuf[1].data = kmalloc(FRAMES_PER_DESC * FRAME_SIZE_PER_DESC, GFP_KERNEL);
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if (!ucpia->sbuf[1].data) {
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retval = -EINVAL;
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goto error_0;
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}
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ret = usb_set_interface(ucpia->dev, ucpia->iface, 3);
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if (ret < 0) {
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printk(KERN_ERR "cpia_usb_open: usb_set_interface error (ret = %d)\n", ret);
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retval = -EBUSY;
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goto error_1;
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}
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ucpia->buffers[0]->status = FRAME_EMPTY;
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ucpia->buffers[0]->length = 0;
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ucpia->buffers[1]->status = FRAME_EMPTY;
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ucpia->buffers[1]->length = 0;
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ucpia->buffers[2]->status = FRAME_EMPTY;
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ucpia->buffers[2]->length = 0;
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ucpia->curbuff = ucpia->buffers[0];
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ucpia->workbuff = ucpia->buffers[1];
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/* We double buffer the Iso lists, and also know the polling
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* interval is every frame (1 == (1 << (bInterval -1))).
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*/
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urb = usb_alloc_urb(FRAMES_PER_DESC, GFP_KERNEL);
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if (!urb) {
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printk(KERN_ERR "cpia_init_isoc: usb_alloc_urb 0\n");
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retval = -ENOMEM;
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goto error_1;
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}
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ucpia->sbuf[0].urb = urb;
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urb->dev = ucpia->dev;
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urb->context = ucpia;
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urb->pipe = usb_rcvisocpipe(ucpia->dev, 1);
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urb->transfer_flags = URB_ISO_ASAP;
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urb->transfer_buffer = ucpia->sbuf[0].data;
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urb->complete = cpia_usb_complete;
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urb->number_of_packets = FRAMES_PER_DESC;
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urb->interval = 1;
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urb->transfer_buffer_length = FRAME_SIZE_PER_DESC * FRAMES_PER_DESC;
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for (fx = 0; fx < FRAMES_PER_DESC; fx++) {
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urb->iso_frame_desc[fx].offset = FRAME_SIZE_PER_DESC * fx;
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urb->iso_frame_desc[fx].length = FRAME_SIZE_PER_DESC;
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}
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urb = usb_alloc_urb(FRAMES_PER_DESC, GFP_KERNEL);
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if (!urb) {
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printk(KERN_ERR "cpia_init_isoc: usb_alloc_urb 1\n");
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retval = -ENOMEM;
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goto error_urb0;
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}
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ucpia->sbuf[1].urb = urb;
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urb->dev = ucpia->dev;
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urb->context = ucpia;
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urb->pipe = usb_rcvisocpipe(ucpia->dev, 1);
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urb->transfer_flags = URB_ISO_ASAP;
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urb->transfer_buffer = ucpia->sbuf[1].data;
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urb->complete = cpia_usb_complete;
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urb->number_of_packets = FRAMES_PER_DESC;
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urb->interval = 1;
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urb->transfer_buffer_length = FRAME_SIZE_PER_DESC * FRAMES_PER_DESC;
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for (fx = 0; fx < FRAMES_PER_DESC; fx++) {
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urb->iso_frame_desc[fx].offset = FRAME_SIZE_PER_DESC * fx;
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urb->iso_frame_desc[fx].length = FRAME_SIZE_PER_DESC;
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}
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/* queue the ISO urbs, and resubmit in the completion handler */
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err = usb_submit_urb(ucpia->sbuf[0].urb, GFP_KERNEL);
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if (err) {
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printk(KERN_ERR "cpia_init_isoc: usb_submit_urb 0 ret %d\n",
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err);
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goto error_urb1;
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}
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err = usb_submit_urb(ucpia->sbuf[1].urb, GFP_KERNEL);
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if (err) {
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printk(KERN_ERR "cpia_init_isoc: usb_submit_urb 1 ret %d\n",
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err);
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goto error_urb1;
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}
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ucpia->streaming = 1;
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ucpia->open = 1;
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return 0;
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error_urb1: /* free urb 1 */
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usb_free_urb(ucpia->sbuf[1].urb);
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ucpia->sbuf[1].urb = NULL;
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error_urb0: /* free urb 0 */
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usb_free_urb(ucpia->sbuf[0].urb);
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ucpia->sbuf[0].urb = NULL;
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error_1:
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kfree (ucpia->sbuf[1].data);
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ucpia->sbuf[1].data = NULL;
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error_0:
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kfree (ucpia->sbuf[0].data);
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ucpia->sbuf[0].data = NULL;
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return retval;
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}
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//
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// convenience functions
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//
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/****************************************************************************
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*
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* WritePacket
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*
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***************************************************************************/
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static int WritePacket(struct usb_device *udev, const u8 *packet, u8 *buf, size_t size)
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{
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if (!packet)
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return -EINVAL;
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return usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
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packet[1] + (packet[0] << 8),
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USB_TYPE_VENDOR | USB_RECIP_DEVICE,
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packet[2] + (packet[3] << 8),
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packet[4] + (packet[5] << 8), buf, size, 1000);
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}
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/****************************************************************************
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*
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* ReadPacket
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*
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***************************************************************************/
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static int ReadPacket(struct usb_device *udev, u8 *packet, u8 *buf, size_t size)
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{
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if (!packet || size <= 0)
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return -EINVAL;
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return usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
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packet[1] + (packet[0] << 8),
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USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
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packet[2] + (packet[3] << 8),
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packet[4] + (packet[5] << 8), buf, size, 1000);
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}
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static int cpia_usb_transferCmd(void *privdata, u8 *command, u8 *data)
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{
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int err = 0;
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int databytes;
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struct usb_cpia *ucpia = (struct usb_cpia *)privdata;
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struct usb_device *udev = ucpia->dev;
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if (!udev) {
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DBG("Internal driver error: udev is NULL\n");
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return -EINVAL;
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}
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if (!command) {
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DBG("Internal driver error: command is NULL\n");
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return -EINVAL;
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}
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databytes = (((int)command[7])<<8) | command[6];
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if (command[0] == DATA_IN) {
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u8 buffer[8];
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if (!data) {
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DBG("Internal driver error: data is NULL\n");
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return -EINVAL;
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}
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err = ReadPacket(udev, command, buffer, 8);
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if (err < 0)
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return err;
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memcpy(data, buffer, databytes);
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} else if(command[0] == DATA_OUT)
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WritePacket(udev, command, data, databytes);
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else {
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DBG("Unexpected first byte of command: %x\n", command[0]);
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err = -EINVAL;
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}
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return 0;
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}
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static int cpia_usb_registerCallback(void *privdata, void (*cb) (void *cbdata),
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void *cbdata)
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{
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return -ENODEV;
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}
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static int cpia_usb_streamStart(void *privdata)
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{
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return -ENODEV;
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}
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static int cpia_usb_streamStop(void *privdata)
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{
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return -ENODEV;
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}
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static int cpia_usb_streamRead(void *privdata, u8 *frame, int noblock)
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{
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struct usb_cpia *ucpia = (struct usb_cpia *) privdata;
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struct framebuf *mybuff;
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if (!ucpia || !ucpia->present)
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return -1;
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if (ucpia->curbuff->status != FRAME_READY)
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interruptible_sleep_on(&ucpia->wq_stream);
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else
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DBG("Frame already waiting!\n");
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mybuff = ucpia->curbuff;
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if (!mybuff)
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return -1;
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if (mybuff->status != FRAME_READY || mybuff->length < 4) {
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DBG("Something went wrong!\n");
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return -1;
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}
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memcpy(frame, mybuff->data, mybuff->length);
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mybuff->status = FRAME_EMPTY;
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/* DBG("read done, %d bytes, Header: %x/%x, Footer: %x%x%x%x\n", */
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/* mybuff->length, frame[0], frame[1], */
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/* frame[mybuff->length-4], frame[mybuff->length-3], */
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/* frame[mybuff->length-2], frame[mybuff->length-1]); */
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return mybuff->length;
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}
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static void cpia_usb_free_resources(struct usb_cpia *ucpia, int try)
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{
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if (!ucpia->streaming)
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return;
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ucpia->streaming = 0;
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/* Set packet size to 0 */
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if (try) {
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int ret;
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ret = usb_set_interface(ucpia->dev, ucpia->iface, 0);
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if (ret < 0) {
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printk(KERN_ERR "usb_set_interface error (ret = %d)\n", ret);
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return;
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}
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}
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/* Unschedule all of the iso td's */
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if (ucpia->sbuf[1].urb) {
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usb_kill_urb(ucpia->sbuf[1].urb);
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usb_free_urb(ucpia->sbuf[1].urb);
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ucpia->sbuf[1].urb = NULL;
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}
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kfree(ucpia->sbuf[1].data);
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ucpia->sbuf[1].data = NULL;
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if (ucpia->sbuf[0].urb) {
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usb_kill_urb(ucpia->sbuf[0].urb);
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usb_free_urb(ucpia->sbuf[0].urb);
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ucpia->sbuf[0].urb = NULL;
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}
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kfree(ucpia->sbuf[0].data);
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ucpia->sbuf[0].data = NULL;
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}
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static int cpia_usb_close(void *privdata)
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{
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struct usb_cpia *ucpia = (struct usb_cpia *) privdata;
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if(!ucpia)
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return -ENODEV;
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ucpia->open = 0;
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/* ucpia->present = 0 protects against trying to reset the
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* alt setting if camera is physically disconnected while open */
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cpia_usb_free_resources(ucpia, ucpia->present);
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return 0;
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}
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/* Probing and initializing */
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static int cpia_probe(struct usb_interface *intf,
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const struct usb_device_id *id)
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{
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struct usb_device *udev = interface_to_usbdev(intf);
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struct usb_host_interface *interface;
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struct usb_cpia *ucpia;
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struct cam_data *cam;
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int ret;
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/* A multi-config CPiA camera? */
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if (udev->descriptor.bNumConfigurations != 1)
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return -ENODEV;
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interface = intf->cur_altsetting;
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printk(KERN_INFO "USB CPiA camera found\n");
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ucpia = kzalloc(sizeof(*ucpia), GFP_KERNEL);
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if (!ucpia) {
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printk(KERN_ERR "couldn't kmalloc cpia struct\n");
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return -ENOMEM;
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}
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ucpia->dev = udev;
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ucpia->iface = interface->desc.bInterfaceNumber;
|
|
init_waitqueue_head(&ucpia->wq_stream);
|
|
|
|
ucpia->buffers[0] = vmalloc(sizeof(*ucpia->buffers[0]));
|
|
if (!ucpia->buffers[0]) {
|
|
printk(KERN_ERR "couldn't vmalloc frame buffer 0\n");
|
|
goto fail_alloc_0;
|
|
}
|
|
|
|
ucpia->buffers[1] = vmalloc(sizeof(*ucpia->buffers[1]));
|
|
if (!ucpia->buffers[1]) {
|
|
printk(KERN_ERR "couldn't vmalloc frame buffer 1\n");
|
|
goto fail_alloc_1;
|
|
}
|
|
|
|
ucpia->buffers[2] = vmalloc(sizeof(*ucpia->buffers[2]));
|
|
if (!ucpia->buffers[2]) {
|
|
printk(KERN_ERR "couldn't vmalloc frame buffer 2\n");
|
|
goto fail_alloc_2;
|
|
}
|
|
|
|
ucpia->buffers[0]->next = ucpia->buffers[1];
|
|
ucpia->buffers[1]->next = ucpia->buffers[2];
|
|
ucpia->buffers[2]->next = ucpia->buffers[0];
|
|
|
|
ret = usb_set_interface(udev, ucpia->iface, 0);
|
|
if (ret < 0) {
|
|
printk(KERN_ERR "cpia_probe: usb_set_interface error (ret = %d)\n", ret);
|
|
/* goto fail_all; */
|
|
}
|
|
|
|
/* Before register_camera, important */
|
|
ucpia->present = 1;
|
|
|
|
cam = cpia_register_camera(&cpia_usb_ops, ucpia);
|
|
if (!cam) {
|
|
LOG("failed to cpia_register_camera\n");
|
|
goto fail_all;
|
|
}
|
|
|
|
spin_lock( &cam_list_lock_usb );
|
|
list_add( &cam->cam_data_list, &cam_list );
|
|
spin_unlock( &cam_list_lock_usb );
|
|
|
|
usb_set_intfdata(intf, cam);
|
|
return 0;
|
|
|
|
fail_all:
|
|
vfree(ucpia->buffers[2]);
|
|
ucpia->buffers[2] = NULL;
|
|
fail_alloc_2:
|
|
vfree(ucpia->buffers[1]);
|
|
ucpia->buffers[1] = NULL;
|
|
fail_alloc_1:
|
|
vfree(ucpia->buffers[0]);
|
|
ucpia->buffers[0] = NULL;
|
|
fail_alloc_0:
|
|
kfree(ucpia);
|
|
return -EIO;
|
|
}
|
|
|
|
static void cpia_disconnect(struct usb_interface *intf);
|
|
|
|
static struct usb_device_id cpia_id_table [] = {
|
|
{ USB_DEVICE(0x0553, 0x0002) },
|
|
{ USB_DEVICE(0x0813, 0x0001) },
|
|
{ } /* Terminating entry */
|
|
};
|
|
|
|
MODULE_DEVICE_TABLE (usb, cpia_id_table);
|
|
MODULE_LICENSE("GPL");
|
|
|
|
|
|
static struct usb_driver cpia_driver = {
|
|
.name = "cpia",
|
|
.probe = cpia_probe,
|
|
.disconnect = cpia_disconnect,
|
|
.id_table = cpia_id_table,
|
|
};
|
|
|
|
static void cpia_disconnect(struct usb_interface *intf)
|
|
{
|
|
struct cam_data *cam = usb_get_intfdata(intf);
|
|
struct usb_cpia *ucpia;
|
|
|
|
usb_set_intfdata(intf, NULL);
|
|
if (!cam)
|
|
return;
|
|
|
|
ucpia = (struct usb_cpia *) cam->lowlevel_data;
|
|
spin_lock( &cam_list_lock_usb );
|
|
list_del(&cam->cam_data_list);
|
|
spin_unlock( &cam_list_lock_usb );
|
|
|
|
ucpia->present = 0;
|
|
|
|
cpia_unregister_camera(cam);
|
|
if(ucpia->open)
|
|
cpia_usb_close(cam->lowlevel_data);
|
|
|
|
ucpia->curbuff->status = FRAME_ERROR;
|
|
|
|
if (waitqueue_active(&ucpia->wq_stream))
|
|
wake_up_interruptible(&ucpia->wq_stream);
|
|
|
|
ucpia->curbuff = ucpia->workbuff = NULL;
|
|
|
|
vfree(ucpia->buffers[2]);
|
|
ucpia->buffers[2] = NULL;
|
|
|
|
vfree(ucpia->buffers[1]);
|
|
ucpia->buffers[1] = NULL;
|
|
|
|
vfree(ucpia->buffers[0]);
|
|
ucpia->buffers[0] = NULL;
|
|
|
|
cam->lowlevel_data = NULL;
|
|
kfree(ucpia);
|
|
}
|
|
|
|
static int __init usb_cpia_init(void)
|
|
{
|
|
printk(KERN_INFO "%s v%d.%d.%d\n",ABOUT,
|
|
CPIA_USB_MAJ_VER,CPIA_USB_MIN_VER,CPIA_USB_PATCH_VER);
|
|
|
|
spin_lock_init(&cam_list_lock_usb);
|
|
return usb_register(&cpia_driver);
|
|
}
|
|
|
|
static void __exit usb_cpia_cleanup(void)
|
|
{
|
|
usb_deregister(&cpia_driver);
|
|
}
|
|
|
|
|
|
module_init (usb_cpia_init);
|
|
module_exit (usb_cpia_cleanup);
|
|
|