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/*
* cpia_usb CPiA USB driver
*
* Supports CPiA based parallel port Video Camera's.
*
* Copyright (C) 1999 Jochen Scharrlach <Jochen.Scharrlach@schwaben.de>
* Copyright (C) 1999, 2000 Johannes Erdfelt <johannes@erdfelt.com>
*
* 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/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/wait.h>
#include <linux/sched.h>
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/usb.h>
#include "cpia.h"
#define USB_REQ_CPIA_GRAB_FRAME 0xC1
#define USB_REQ_CPIA_UPLOAD_FRAME 0xC2
#define WAIT_FOR_NEXT_FRAME 0
#define FORCE_FRAME_UPLOAD 1
#define FRAMES_PER_DESC 10
#define FRAME_SIZE_PER_DESC 960 /* Shouldn't be hardcoded */
#define CPIA_NUMSBUF 2
#define STREAM_BUF_SIZE (PAGE_SIZE * 4)
#define SCRATCH_BUF_SIZE (STREAM_BUF_SIZE * 2)
struct cpia_sbuf {
char *data;
urb_t *urb;
};
#define FRAMEBUF_LEN (CPIA_MAX_FRAME_SIZE+100)
enum framebuf_status {
FRAME_EMPTY,
FRAME_READING,
FRAME_READY,
FRAME_ERROR,
};
struct framebuf {
int length;
enum framebuf_status status;
u8 data[FRAMEBUF_LEN];
struct framebuf *next;
};
struct usb_cpia {
/* Device structure */
struct usb_device *dev;
unsigned char iface;
wait_queue_head_t wq_stream;
int cursbuf; /* Current receiving sbuf */
struct cpia_sbuf sbuf[CPIA_NUMSBUF]; /* Double buffering */
int streaming;
int open;
int present;
struct framebuf *buffers[3];
struct framebuf *curbuff, *workbuff;
};
static int cpia_usb_open(void *privdata);
static int cpia_usb_registerCallback(void *privdata, void (*cb) (void *cbdata),
void *cbdata);
static int cpia_usb_transferCmd(void *privdata, u8 *command, u8 *data);
static int cpia_usb_streamStart(void *privdata);
static int cpia_usb_streamStop(void *privdata);
static int cpia_usb_streamRead(void *privdata, u8 *frame, int noblock);
static int cpia_usb_close(void *privdata);
#define ABOUT "USB driver for Vision CPiA based cameras"
static struct cpia_camera_ops cpia_usb_ops = {
cpia_usb_open,
cpia_usb_registerCallback,
cpia_usb_transferCmd,
cpia_usb_streamStart,
cpia_usb_streamStop,
cpia_usb_streamRead,
cpia_usb_close,
0
};
static struct cam_data *cam_list;
static spinlock_t cam_list_lock_usb;
static void cpia_usb_complete(struct urb *urb)
{
int i;
char *cdata;
struct usb_cpia *ucpia;
if (!urb || !urb->context)
return;
ucpia = (struct usb_cpia *) urb->context;
if (!ucpia->dev || !ucpia->streaming || !ucpia->present || !ucpia->open)
return;
if (ucpia->workbuff->status == FRAME_EMPTY) {
ucpia->workbuff->status = FRAME_READING;
ucpia->workbuff->length = 0;
}
for (i = 0; i < urb->number_of_packets; i++) {
int n = urb->iso_frame_desc[i].actual_length;
int st = urb->iso_frame_desc[i].status;
cdata = urb->transfer_buffer + urb->iso_frame_desc[i].offset;
if (st)
printk(KERN_DEBUG "cpia data error: [%d] len=%d, status=%X\n", i, n, st);
if (FRAMEBUF_LEN < ucpia->workbuff->length + n) {
printk(KERN_DEBUG "cpia: scratch buf overflow!scr_len: %d, n: %d\n", ucpia->workbuff->length, n);
return;
}
if (n) {
if ((ucpia->workbuff->length > 0) ||
(0x19 == cdata[0] && 0x68 == cdata[1])) {
memcpy(ucpia->workbuff->data + ucpia->workbuff->length, cdata, n);
ucpia->workbuff->length += n;
} else
DBG("Ignoring packet!\n");
} else {
if (ucpia->workbuff->length > 4 &&
0xff == ucpia->workbuff->data[ucpia->workbuff->length-1] &&
0xff == ucpia->workbuff->data[ucpia->workbuff->length-2] &&
0xff == ucpia->workbuff->data[ucpia->workbuff->length-3] &&
0xff == ucpia->workbuff->data[ucpia->workbuff->length-4]) {
ucpia->workbuff->status = FRAME_READY;
ucpia->curbuff = ucpia->workbuff;
ucpia->workbuff = ucpia->workbuff->next;
ucpia->workbuff->status = FRAME_EMPTY;
ucpia->workbuff->length = 0;
if (waitqueue_active(&ucpia->wq_stream))
wake_up_interruptible(&ucpia->wq_stream);
}
}
}
}
static int cpia_usb_open(void *privdata)
{
struct usb_cpia *ucpia = (struct usb_cpia *) privdata;
urb_t *urb;
int ret, retval = 0, fx, err;
if (!ucpia)
return -EINVAL;
ucpia->sbuf[0].data = kmalloc(FRAMES_PER_DESC * FRAME_SIZE_PER_DESC, GFP_KERNEL);
if (!ucpia->sbuf[0].data)
return -EINVAL;
ucpia->sbuf[1].data = kmalloc(FRAMES_PER_DESC * FRAME_SIZE_PER_DESC, GFP_KERNEL);
if (!ucpia->sbuf[1].data) {
retval = -EINVAL;
goto error_0;
}
ret = usb_set_interface(ucpia->dev, ucpia->iface, 3);
if (ret < 0) {
printk(KERN_ERR "cpia_usb_open: usb_set_interface error (ret = %d)\n", ret);
retval = -EBUSY;
goto error_1;
}
ucpia->buffers[0]->status = FRAME_EMPTY;
ucpia->buffers[0]->length = 0;
ucpia->buffers[1]->status = FRAME_EMPTY;
ucpia->buffers[1]->length = 0;
ucpia->buffers[2]->status = FRAME_EMPTY;
ucpia->buffers[2]->length = 0;
ucpia->curbuff = ucpia->buffers[0];
ucpia->workbuff = ucpia->buffers[1];
/* We double buffer the Iso lists */
urb = usb_alloc_urb(FRAMES_PER_DESC);
if (!urb) {
printk(KERN_ERR "cpia_init_isoc: usb_alloc_urb 0\n");
retval = -ENOMEM;
goto error_1;
}
ucpia->sbuf[0].urb = urb;
urb->dev = ucpia->dev;
urb->context = ucpia;
urb->pipe = usb_rcvisocpipe(ucpia->dev, 1);
urb->transfer_flags = USB_ISO_ASAP;
urb->transfer_buffer = ucpia->sbuf[0].data;
urb->complete = cpia_usb_complete;
urb->number_of_packets = FRAMES_PER_DESC;
urb->transfer_buffer_length = FRAME_SIZE_PER_DESC * FRAMES_PER_DESC;
for (fx = 0; fx < FRAMES_PER_DESC; fx++) {
urb->iso_frame_desc[fx].offset = FRAME_SIZE_PER_DESC * fx;
urb->iso_frame_desc[fx].length = FRAME_SIZE_PER_DESC;
}
urb = usb_alloc_urb(FRAMES_PER_DESC);
if (!urb) {
printk(KERN_ERR "cpia_init_isoc: usb_alloc_urb 1\n");
retval = -ENOMEM;
goto error_urb0;
}
ucpia->sbuf[1].urb = urb;
urb->dev = ucpia->dev;
urb->context = ucpia;
urb->pipe = usb_rcvisocpipe(ucpia->dev, 1);
urb->transfer_flags = USB_ISO_ASAP;
urb->transfer_buffer = ucpia->sbuf[1].data;
urb->complete = cpia_usb_complete;
urb->number_of_packets = FRAMES_PER_DESC;
urb->transfer_buffer_length = FRAME_SIZE_PER_DESC * FRAMES_PER_DESC;
for (fx = 0; fx < FRAMES_PER_DESC; fx++) {
urb->iso_frame_desc[fx].offset = FRAME_SIZE_PER_DESC * fx;
urb->iso_frame_desc[fx].length = FRAME_SIZE_PER_DESC;
}
ucpia->sbuf[1].urb->next = ucpia->sbuf[0].urb;
ucpia->sbuf[0].urb->next = ucpia->sbuf[1].urb;
err = usb_submit_urb(ucpia->sbuf[0].urb);
if (err) {
printk(KERN_ERR "cpia_init_isoc: usb_submit_urb 0 ret %d\n",
err);
goto error_urb1;
}
err = usb_submit_urb(ucpia->sbuf[1].urb);
if (err) {
printk(KERN_ERR "cpia_init_isoc: usb_submit_urb 1 ret %d\n",
err);
goto error_urb1;
}
ucpia->streaming = 1;
ucpia->open = 1;
return 0;
error_urb1: /* free urb 1 */
usb_free_urb(ucpia->sbuf[1].urb);
error_urb0: /* free urb 0 */
usb_free_urb(ucpia->sbuf[0].urb);
error_1:
kfree (ucpia->sbuf[1].data);
error_0:
kfree (ucpia->sbuf[0].data);
return retval;
}
//
// convenience functions
//
/****************************************************************************
*
* WritePacket
*
***************************************************************************/
static int WritePacket(struct usb_device *udev, const u8 *packet, u8 *buf, size_t size)
{
if (!packet)
return -EINVAL;
return usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
packet[1] + (packet[0] << 8),
USB_TYPE_VENDOR | USB_RECIP_DEVICE,
packet[2] + (packet[3] << 8),
packet[4] + (packet[5] << 8), buf, size, HZ);
}
/****************************************************************************
*
* ReadPacket
*
***************************************************************************/
static int ReadPacket(struct usb_device *udev, u8 *packet, u8 *buf, size_t size)
{
if (!packet || size <= 0)
return -EINVAL;
return usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
packet[1] + (packet[0] << 8),
USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
packet[2] + (packet[3] << 8),
packet[4] + (packet[5] << 8), buf, size, HZ);
}
static int cpia_usb_transferCmd(void *privdata, u8 *command, u8 *data)
{
int err = 0;
int databytes;
struct usb_cpia *ucpia = (struct usb_cpia *)privdata;
struct usb_device *udev = ucpia->dev;
if (!udev) {
DBG("Internal driver error: udev is NULL\n");
return -EINVAL;
}
if (!command) {
DBG("Internal driver error: command is NULL\n");
return -EINVAL;
}
databytes = (((int)command[7])<<8) | command[6];
if (command[0] == DATA_IN) {
u8 buffer[8];
if (!data) {
DBG("Internal driver error: data is NULL\n");
return -EINVAL;
}
err = ReadPacket(udev, command, buffer, 8);
if (err < 0)
return err;
memcpy(data, buffer, databytes);
} else if(command[0] == DATA_OUT)
WritePacket(udev, command, data, databytes);
else {
DBG("Unexpected first byte of command: %x\n", command[0]);
err = -EINVAL;
}
return 0;
}
static int cpia_usb_registerCallback(void *privdata, void (*cb) (void *cbdata),
void *cbdata)
{
return -ENODEV;
}
static int cpia_usb_streamStart(void *privdata)
{
return -ENODEV;
}
static int cpia_usb_streamStop(void *privdata)
{
return -ENODEV;
}
static int cpia_usb_streamRead(void *privdata, u8 *frame, int noblock)
{
struct usb_cpia *ucpia = (struct usb_cpia *) privdata;
struct framebuf *mybuff;
if (!ucpia || !ucpia->present)
return -1;
if (ucpia->curbuff->status != FRAME_READY)
interruptible_sleep_on(&ucpia->wq_stream);
else
DBG("Frame already waiting!\n");
mybuff = ucpia->curbuff;
if (!mybuff)
return -1;
if (mybuff->status != FRAME_READY || mybuff->length < 4) {
DBG("Something went wrong!\n");
return -1;
}
memcpy(frame, mybuff->data, mybuff->length);
mybuff->status = FRAME_EMPTY;
/* DBG("read done, %d bytes, Header: %x/%x, Footer: %x%x%x%x\n", */
/* mybuff->length, frame[0], frame[1], */
/* frame[mybuff->length-4], frame[mybuff->length-3], */
/* frame[mybuff->length-2], frame[mybuff->length-1]); */
return mybuff->length;
}
static void cpia_usb_free_resources(struct usb_cpia *ucpia, int try)
{
if (!ucpia->streaming)
return;
ucpia->streaming = 0;
/* Set packet size to 0 */
if (try) {
int ret;
ret = usb_set_interface(ucpia->dev, ucpia->iface, 0);
if (ret < 0) {
printk(KERN_ERR "usb_set_interface error (ret = %d)\n", ret);
return;
}
}
/* Unschedule all of the iso td's */
if (ucpia->sbuf[1].urb) {
usb_unlink_urb(ucpia->sbuf[1].urb);
usb_free_urb(ucpia->sbuf[1].urb);
ucpia->sbuf[1].urb = NULL;
}
if (ucpia->sbuf[1].data) {
kfree(ucpia->sbuf[1].data);
ucpia->sbuf[1].data = NULL;
}
if (ucpia->sbuf[0].urb) {
usb_unlink_urb(ucpia->sbuf[0].urb);
usb_free_urb(ucpia->sbuf[0].urb);
ucpia->sbuf[0].urb = NULL;
}
if (ucpia->sbuf[0].data) {
kfree(ucpia->sbuf[0].data);
ucpia->sbuf[0].data = NULL;
}
}
static int cpia_usb_close(void *privdata)
{
struct usb_cpia *ucpia = (struct usb_cpia *) privdata;
ucpia->open = 0;
cpia_usb_free_resources(ucpia, 1);
if (!ucpia->present)
kfree(ucpia);
return 0;
}
int cpia_usb_init(void)
{
/* return -ENODEV; */
return 0;
}
/* Probing and initializing */
static void *cpia_probe(struct usb_device *udev, unsigned int ifnum,
const struct usb_device_id *id)
{
struct usb_interface_descriptor *interface;
struct usb_cpia *ucpia;
struct cam_data *cam;
int ret;
/* A multi-config CPiA camera? */
if (udev->descriptor.bNumConfigurations != 1)
return NULL;
interface = &udev->actconfig->interface[ifnum].altsetting[0];
printk(KERN_INFO "USB CPiA camera found\n");
ucpia = kmalloc(sizeof(*ucpia), GFP_KERNEL);
if (!ucpia) {
printk(KERN_ERR "couldn't kmalloc cpia struct\n");
return NULL;
}
memset(ucpia, 0, sizeof(*ucpia));
ucpia->dev = udev;
ucpia->iface = interface->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 );
cpia_add_to_list(cam_list, cam);
spin_unlock( &cam_list_lock_usb );
return cam;
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:
return NULL;
}
static void cpia_disconnect(struct usb_device *dev, void *ptr);
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,
};
/* don't use dev, it may be NULL! (see usb_cpia_cleanup) */
/* _disconnect from usb_cpia_cleanup is not necessary since usb_deregister */
/* will do it for us as well as passing a udev structure - jerdfelt */
static void cpia_disconnect(struct usb_device *udev, void *ptr)
{
struct cam_data *cam = (struct cam_data *) ptr;
struct usb_cpia *ucpia = (struct usb_cpia *) cam->lowlevel_data;
spin_lock( &cam_list_lock_usb );
cpia_remove_from_list(cam);
spin_unlock( &cam_list_lock_usb );
/* Don't even try to reset the altsetting if we're disconnected */
cpia_usb_free_resources(ucpia, 0);
ucpia->present = 0;
cpia_unregister_camera(cam);
ucpia->curbuff->status = FRAME_ERROR;
if (waitqueue_active(&ucpia->wq_stream))
wake_up_interruptible(&ucpia->wq_stream);
usb_driver_release_interface(&cpia_driver,
&udev->actconfig->interface[0]);
ucpia->curbuff = ucpia->workbuff = NULL;
if (ucpia->buffers[2]) {
vfree(ucpia->buffers[2]);
ucpia->buffers[2] = NULL;
}
if (ucpia->buffers[1]) {
vfree(ucpia->buffers[1]);
ucpia->buffers[1] = NULL;
}
if (ucpia->buffers[0]) {
vfree(ucpia->buffers[0]);
ucpia->buffers[0] = NULL;
}
if (!ucpia->open)
kfree(ucpia);
}
static int __init usb_cpia_init(void)
{
cam_list = NULL;
spin_lock_init(&cam_list_lock_usb);
return usb_register(&cpia_driver);
}
static void __exit usb_cpia_cleanup(void)
{
/*
struct cam_data *cam;
while ((cam = cam_list) != NULL)
cpia_disconnect(NULL, cam);
*/
usb_deregister(&cpia_driver);
}
module_init (usb_cpia_init);
module_exit (usb_cpia_cleanup);
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