[net-next-2.6.git] / drivers / media / video / cpia_usb.c

/*
 * 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.
 */

/* define _CPIA_DEBUG_ for verbose debug output (see cpia.h) */
/* #define _CPIA_DEBUG_  1 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/wait.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;
	struct urb *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,
	THIS_MODULE
};

static LIST_HEAD(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);
			}
		}
	}

	/* resubmit */
	urb->dev = ucpia->dev;
	if ((i = usb_submit_urb(urb, GFP_ATOMIC)) != 0)
		printk(KERN_ERR "%s: usb_submit_urb ret %d\n", __func__,  i);
}

static int cpia_usb_open(void *privdata)
{
	struct usb_cpia *ucpia = (struct usb_cpia *) privdata;
	struct urb *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, and also know the polling
	 * interval is every frame (1 == (1 << (bInterval -1))).
	 */
	urb = usb_alloc_urb(FRAMES_PER_DESC, GFP_KERNEL);
	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 = URB_ISO_ASAP;
	urb->transfer_buffer = ucpia->sbuf[0].data;
	urb->complete = cpia_usb_complete;
	urb->number_of_packets = FRAMES_PER_DESC;
	urb->interval = 1;
	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, GFP_KERNEL);
	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 = URB_ISO_ASAP;
	urb->transfer_buffer = ucpia->sbuf[1].data;
	urb->complete = cpia_usb_complete;
	urb->number_of_packets = FRAMES_PER_DESC;
	urb->interval = 1;
	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;
	}

	/* queue the ISO urbs, and resubmit in the completion handler */
	err = usb_submit_urb(ucpia->sbuf[0].urb, GFP_KERNEL);
	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, GFP_KERNEL);
	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);
	ucpia->sbuf[1].urb = NULL;
error_urb0:		/* free urb 0 */
	usb_free_urb(ucpia->sbuf[0].urb);
	ucpia->sbuf[0].urb = NULL;
error_1:
	kfree (ucpia->sbuf[1].data);
	ucpia->sbuf[1].data = NULL;
error_0:
	kfree (ucpia->sbuf[0].data);
	ucpia->sbuf[0].data = NULL;

	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, 1000);
}

/****************************************************************************
 *
 *  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, 1000);
}

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_kill_urb(ucpia->sbuf[1].urb);
		usb_free_urb(ucpia->sbuf[1].urb);
		ucpia->sbuf[1].urb = NULL;
	}

	kfree(ucpia->sbuf[1].data);
	ucpia->sbuf[1].data = NULL;

	if (ucpia->sbuf[0].urb) {
		usb_kill_urb(ucpia->sbuf[0].urb);
		usb_free_urb(ucpia->sbuf[0].urb);
		ucpia->sbuf[0].urb = NULL;
	}

	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;

	if(!ucpia)
		return -ENODEV;

	ucpia->open = 0;

	/* ucpia->present = 0 protects against trying to reset the
	 * alt setting if camera is physically disconnected while open */
	cpia_usb_free_resources(ucpia, ucpia->present);

	return 0;
}

/* Probing and initializing */

static int cpia_probe(struct usb_interface *intf,
		      const struct usb_device_id *id)
{
	struct usb_device *udev = interface_to_usbdev(intf);
	struct usb_host_interface *interface;
	struct usb_cpia *ucpia;
	struct cam_data *cam;
	int ret;

	/* A multi-config CPiA camera? */
	if (udev->descriptor.bNumConfigurations != 1)
		return -ENODEV;

	interface = intf->cur_altsetting;

	printk(KERN_INFO "USB CPiA camera found\n");

	ucpia = kzalloc(sizeof(*ucpia), GFP_KERNEL);
	if (!ucpia) {
		printk(KERN_ERR "couldn't kmalloc cpia struct\n");
		return -ENOMEM;
	}

	ucpia->dev = udev;
	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);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* cpia_usb CPiA USB driver
	3	*
	4	* Supports CPiA based parallel port Video Camera's.
	5	*
	6	* Copyright (C) 1999 Jochen Scharrlach <Jochen.Scharrlach@schwaben.de>
	7	* Copyright (C) 1999, 2000 Johannes Erdfelt <johannes@erdfelt.com>
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License as published by
	11	* the Free Software Foundation; either version 2 of the License, or
	12	* (at your option) any later version.
	13	*
	14	* This program is distributed in the hope that it will be useful,
	15	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	17	* GNU General Public License for more details.
	18	*
	19	* You should have received a copy of the GNU General Public License
	20	* along with this program; if not, write to the Free Software
	21	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	22	*/
	23
	24	/* define _CPIA_DEBUG_ for verbose debug output (see cpia.h) */
d56410e0	25	/* #define _CPIA_DEBUG_ 1 */
1da177e4 LT	26
	27	#include <linux/module.h>
	28	#include <linux/kernel.h>
	29	#include <linux/init.h>
	30	#include <linux/wait.h>
	31	#include <linux/list.h>
	32	#include <linux/slab.h>
	33	#include <linux/vmalloc.h>
	34	#include <linux/usb.h>
	35
	36	#include "cpia.h"
	37
	38	#define USB_REQ_CPIA_GRAB_FRAME 0xC1
	39	#define USB_REQ_CPIA_UPLOAD_FRAME 0xC2
	40	#define WAIT_FOR_NEXT_FRAME 0
	41	#define FORCE_FRAME_UPLOAD 1
	42
	43	#define FRAMES_PER_DESC 10
	44	#define FRAME_SIZE_PER_DESC 960 /* Shouldn't be hardcoded */
	45	#define CPIA_NUMSBUF 2
	46	#define STREAM_BUF_SIZE (PAGE_SIZE * 4)
	47	#define SCRATCH_BUF_SIZE (STREAM_BUF_SIZE * 2)
	48
	49	struct cpia_sbuf {
	50	char *data;
	51	struct urb *urb;
	52	};
	53
	54	#define FRAMEBUF_LEN (CPIA_MAX_FRAME_SIZE+100)
	55	enum framebuf_status {
	56	FRAME_EMPTY,
	57	FRAME_READING,
	58	FRAME_READY,
	59	FRAME_ERROR,
	60	};
	61
	62	struct framebuf {
	63	int length;
	64	enum framebuf_status status;
	65	u8 data[FRAMEBUF_LEN];
	66	struct framebuf *next;
	67	};
	68
	69	struct usb_cpia {
	70	/* Device structure */
	71	struct usb_device *dev;
	72
	73	unsigned char iface;
	74	wait_queue_head_t wq_stream;
	75
	76	int cursbuf; /* Current receiving sbuf */
	77	struct cpia_sbuf sbuf[CPIA_NUMSBUF]; /* Double buffering */
	78
	79	int streaming;
	80	int open;
	81	int present;
	82	struct framebuf *buffers[3];
	83	struct framebuf curbuff, workbuff;
	84	};
	85
	86	static int cpia_usb_open(void *privdata);
	87	static int cpia_usb_registerCallback(void privdata, void (cb) (void *cbdata),
d56410e0	88	void *cbdata);
1da177e4 LT	89	static int cpia_usb_transferCmd(void privdata, u8 command, u8 *data);
	90	static int cpia_usb_streamStart(void *privdata);
	91	static int cpia_usb_streamStop(void *privdata);
	92	static int cpia_usb_streamRead(void privdata, u8 frame, int noblock);
	93	static int cpia_usb_close(void *privdata);
	94
	95	#define ABOUT "USB driver for Vision CPiA based cameras"
	96
	97	static struct cpia_camera_ops cpia_usb_ops = {
	98	cpia_usb_open,
	99	cpia_usb_registerCallback,
	100	cpia_usb_transferCmd,
	101	cpia_usb_streamStart,
	102	cpia_usb_streamStop,
	103	cpia_usb_streamRead,
	104	cpia_usb_close,
	105	0,
	106	THIS_MODULE
	107	};
	108
	109	static LIST_HEAD(cam_list);
	110	static spinlock_t cam_list_lock_usb;
	111
7d12e780	112	static void cpia_usb_complete(struct urb *urb)
1da177e4 LT	113	{
	114	int i;
	115	char *cdata;
	116	struct usb_cpia *ucpia;
	117
	118	if (!urb \|\| !urb->context)
	119	return;
	120
	121	ucpia = (struct usb_cpia *) urb->context;
	122
	123	if (!ucpia->dev \|\| !ucpia->streaming \|\| !ucpia->present \|\| !ucpia->open)
	124	return;
	125
	126	if (ucpia->workbuff->status == FRAME_EMPTY) {
	127	ucpia->workbuff->status = FRAME_READING;
	128	ucpia->workbuff->length = 0;
	129	}
d56410e0	130
1da177e4 LT	131	for (i = 0; i < urb->number_of_packets; i++) {
	132	int n = urb->iso_frame_desc[i].actual_length;
	133	int st = urb->iso_frame_desc[i].status;
	134
	135	cdata = urb->transfer_buffer + urb->iso_frame_desc[i].offset;
	136
	137	if (st)
	138	printk(KERN_DEBUG "cpia data error: [%d] len=%d, status=%X\n", i, n, st);
	139
	140	if (FRAMEBUF_LEN < ucpia->workbuff->length + n) {
	141	printk(KERN_DEBUG "cpia: scratch buf overflow!scr_len: %d, n: %d\n", ucpia->workbuff->length, n);
	142	return;
	143	}
d56410e0	144
1da177e4	145	if (n) {
d56410e0	146	if ((ucpia->workbuff->length > 0) \|\|
1da177e4 LT	147	(0x19 == cdata[0] && 0x68 == cdata[1])) {
	148	memcpy(ucpia->workbuff->data + ucpia->workbuff->length, cdata, n);
	149	ucpia->workbuff->length += n;
	150	} else
	151	DBG("Ignoring packet!\n");
	152	} else {
	153	if (ucpia->workbuff->length > 4 &&
	154	0xff == ucpia->workbuff->data[ucpia->workbuff->length-1] &&
	155	0xff == ucpia->workbuff->data[ucpia->workbuff->length-2] &&
	156	0xff == ucpia->workbuff->data[ucpia->workbuff->length-3] &&
	157	0xff == ucpia->workbuff->data[ucpia->workbuff->length-4]) {
	158	ucpia->workbuff->status = FRAME_READY;
	159	ucpia->curbuff = ucpia->workbuff;
	160	ucpia->workbuff = ucpia->workbuff->next;
	161	ucpia->workbuff->status = FRAME_EMPTY;
	162	ucpia->workbuff->length = 0;
d56410e0	163
1da177e4 LT	164	if (waitqueue_active(&ucpia->wq_stream))
	165	wake_up_interruptible(&ucpia->wq_stream);
	166	}
	167	}
	168	}
	169
	170	/* resubmit */
	171	urb->dev = ucpia->dev;
	172	if ((i = usb_submit_urb(urb, GFP_ATOMIC)) != 0)
7e28adb2	173	printk(KERN_ERR "%s: usb_submit_urb ret %d\n", __func__, i);
1da177e4 LT	174	}
	175
	176	static int cpia_usb_open(void *privdata)
	177	{
	178	struct usb_cpia ucpia = (struct usb_cpia ) privdata;
	179	struct urb *urb;
	180	int ret, retval = 0, fx, err;
d56410e0	181
1da177e4 LT	182	if (!ucpia)
	183	return -EINVAL;
	184
	185	ucpia->sbuf[0].data = kmalloc(FRAMES_PER_DESC * FRAME_SIZE_PER_DESC, GFP_KERNEL);
	186	if (!ucpia->sbuf[0].data)
	187	return -EINVAL;
	188
	189	ucpia->sbuf[1].data = kmalloc(FRAMES_PER_DESC * FRAME_SIZE_PER_DESC, GFP_KERNEL);
	190	if (!ucpia->sbuf[1].data) {
	191	retval = -EINVAL;
	192	goto error_0;
	193	}
d56410e0	194
1da177e4 LT	195	ret = usb_set_interface(ucpia->dev, ucpia->iface, 3);
	196	if (ret < 0) {
	197	printk(KERN_ERR "cpia_usb_open: usb_set_interface error (ret = %d)\n", ret);
	198	retval = -EBUSY;
	199	goto error_1;
	200	}
	201
	202	ucpia->buffers[0]->status = FRAME_EMPTY;
	203	ucpia->buffers[0]->length = 0;
	204	ucpia->buffers[1]->status = FRAME_EMPTY;
	205	ucpia->buffers[1]->length = 0;
	206	ucpia->buffers[2]->status = FRAME_EMPTY;
	207	ucpia->buffers[2]->length = 0;
	208	ucpia->curbuff = ucpia->buffers[0];
	209	ucpia->workbuff = ucpia->buffers[1];
	210
	211	/* We double buffer the Iso lists, and also know the polling
	212	* interval is every frame (1 == (1 << (bInterval -1))).
	213	*/
	214	urb = usb_alloc_urb(FRAMES_PER_DESC, GFP_KERNEL);
	215	if (!urb) {
	216	printk(KERN_ERR "cpia_init_isoc: usb_alloc_urb 0\n");
	217	retval = -ENOMEM;
	218	goto error_1;
	219	}
	220
	221	ucpia->sbuf[0].urb = urb;
	222	urb->dev = ucpia->dev;
	223	urb->context = ucpia;
	224	urb->pipe = usb_rcvisocpipe(ucpia->dev, 1);
	225	urb->transfer_flags = URB_ISO_ASAP;
	226	urb->transfer_buffer = ucpia->sbuf[0].data;
	227	urb->complete = cpia_usb_complete;
	228	urb->number_of_packets = FRAMES_PER_DESC;
	229	urb->interval = 1;
	230	urb->transfer_buffer_length = FRAME_SIZE_PER_DESC * FRAMES_PER_DESC;
	231	for (fx = 0; fx < FRAMES_PER_DESC; fx++) {
	232	urb->iso_frame_desc[fx].offset = FRAME_SIZE_PER_DESC * fx;
	233	urb->iso_frame_desc[fx].length = FRAME_SIZE_PER_DESC;
	234	}
	235
	236	urb = usb_alloc_urb(FRAMES_PER_DESC, GFP_KERNEL);
	237	if (!urb) {
	238	printk(KERN_ERR "cpia_init_isoc: usb_alloc_urb 1\n");
	239	retval = -ENOMEM;
	240	goto error_urb0;
	241	}
	242
	243	ucpia->sbuf[1].urb = urb;
	244	urb->dev = ucpia->dev;
	245	urb->context = ucpia;
	246	urb->pipe = usb_rcvisocpipe(ucpia->dev, 1);
	247	urb->transfer_flags = URB_ISO_ASAP;
	248	urb->transfer_buffer = ucpia->sbuf[1].data;
	249	urb->complete = cpia_usb_complete;
	250	urb->number_of_packets = FRAMES_PER_DESC;
	251	urb->interval = 1;
	252	urb->transfer_buffer_length = FRAME_SIZE_PER_DESC * FRAMES_PER_DESC;
	253	for (fx = 0; fx < FRAMES_PER_DESC; fx++) {
	254	urb->iso_frame_desc[fx].offset = FRAME_SIZE_PER_DESC * fx;
	255	urb->iso_frame_desc[fx].length = FRAME_SIZE_PER_DESC;
	256	}
	257
	258	/* queue the ISO urbs, and resubmit in the completion handler */
259	err = usb_submit_urb(ucpia->sbuf[0].urb, GFP_KERNEL);
260	if (err) {
261	printk(KERN_ERR "cpia_init_isoc: usb_submit_urb 0 ret %d\n",
262	err);
263	goto error_urb1;
264	}
265	err = usb_submit_urb(ucpia->sbuf[1].urb, GFP_KERNEL);
266	if (err) {
267	printk(KERN_ERR "cpia_init_isoc: usb_submit_urb 1 ret %d\n",
268	err);
269	goto error_urb1;
270	}
271
272	ucpia->streaming = 1;
273	ucpia->open = 1;
274
275	return 0;
276
277	error_urb1: /* free urb 1 */
278	usb_free_urb(ucpia->sbuf[1].urb);
279	ucpia->sbuf[1].urb = NULL;
280	error_urb0: /* free urb 0 */
281	usb_free_urb(ucpia->sbuf[0].urb);
282	ucpia->sbuf[0].urb = NULL;
283	error_1:
284	kfree (ucpia->sbuf[1].data);
285	ucpia->sbuf[1].data = NULL;
286	error_0:
287	kfree (ucpia->sbuf[0].data);
288	ucpia->sbuf[0].data = NULL;
d56410e0	289
1da177e4 LT	290	return retval;
	291	}
	292
	293	//
	294	// convenience functions
	295	//
	296
	297	/****************************************************************************
	298	*
	299	* WritePacket
	300	*
	301	***************************************************************************/
	302	static int WritePacket(struct usb_device udev, const u8 packet, u8 *buf, size_t size)
	303	{
	304	if (!packet)
	305	return -EINVAL;
	306
	307	return usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
	308	packet[1] + (packet[0] << 8),
	309	USB_TYPE_VENDOR \| USB_RECIP_DEVICE,
d56410e0	310	packet[2] + (packet[3] << 8),
1da177e4 LT	311	packet[4] + (packet[5] << 8), buf, size, 1000);
	312	}
	313
	314	/****************************************************************************
	315	*
	316	* ReadPacket
	317	*
	318	***************************************************************************/
	319	static int ReadPacket(struct usb_device udev, u8 packet, u8 *buf, size_t size)
	320	{
	321	if (!packet \|\| size <= 0)
	322	return -EINVAL;
	323
	324	return usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
	325	packet[1] + (packet[0] << 8),
	326	USB_DIR_IN \| USB_TYPE_VENDOR \| USB_RECIP_DEVICE,
d56410e0	327	packet[2] + (packet[3] << 8),
1da177e4 LT	328	packet[4] + (packet[5] << 8), buf, size, 1000);
	329	}
	330
	331	static int cpia_usb_transferCmd(void privdata, u8 command, u8 *data)
	332	{
	333	int err = 0;
	334	int databytes;
	335	struct usb_cpia ucpia = (struct usb_cpia )privdata;
	336	struct usb_device *udev = ucpia->dev;
	337
	338	if (!udev) {
	339	DBG("Internal driver error: udev is NULL\n");
	340	return -EINVAL;
	341	}
	342
	343	if (!command) {
	344	DBG("Internal driver error: command is NULL\n");
	345	return -EINVAL;
	346	}
	347
	348	databytes = (((int)command[7])<<8) \| command[6];
	349
	350	if (command[0] == DATA_IN) {
	351	u8 buffer[8];
	352
	353	if (!data) {
	354	DBG("Internal driver error: data is NULL\n");
	355	return -EINVAL;
	356	}
	357
	358	err = ReadPacket(udev, command, buffer, 8);
	359	if (err < 0)
	360	return err;
	361
	362	memcpy(data, buffer, databytes);
	363	} else if(command[0] == DATA_OUT)
	364	WritePacket(udev, command, data, databytes);
	365	else {
	366	DBG("Unexpected first byte of command: %x\n", command[0]);
	367	err = -EINVAL;
	368	}
	369
	370	return 0;
	371	}
	372
	373	static int cpia_usb_registerCallback(void privdata, void (cb) (void *cbdata),
	374	void *cbdata)
	375	{
	376	return -ENODEV;
	377	}
	378
	379	static int cpia_usb_streamStart(void *privdata)
	380	{
	381	return -ENODEV;
	382	}
	383
	384	static int cpia_usb_streamStop(void *privdata)
	385	{
	386	return -ENODEV;
	387	}
	388
	389	static int cpia_usb_streamRead(void privdata, u8 frame, int noblock)
	390	{
	391	struct usb_cpia ucpia = (struct usb_cpia ) privdata;
392	struct framebuf *mybuff;
393
394	if (!ucpia \|\| !ucpia->present)
395	return -1;
d56410e0	396
1da177e4 LT	397	if (ucpia->curbuff->status != FRAME_READY)
	398	interruptible_sleep_on(&ucpia->wq_stream);
	399	else
	400	DBG("Frame already waiting!\n");
	401
	402	mybuff = ucpia->curbuff;
	403
	404	if (!mybuff)
	405	return -1;
d56410e0	406
1da177e4 LT	407	if (mybuff->status != FRAME_READY \|\| mybuff->length < 4) {
	408	DBG("Something went wrong!\n");
	409	return -1;
	410	}
	411
	412	memcpy(frame, mybuff->data, mybuff->length);
	413	mybuff->status = FRAME_EMPTY;
d56410e0	414
1da177e4 LT	415	/* DBG("read done, %d bytes, Header: %x/%x, Footer: %x%x%x%x\n", */
	416	/* mybuff->length, frame[0], frame[1], */
	417	/* frame[mybuff->length-4], frame[mybuff->length-3], */
	418	/* frame[mybuff->length-2], frame[mybuff->length-1]); */
	419
	420	return mybuff->length;
	421	}
	422
	423	static void cpia_usb_free_resources(struct usb_cpia *ucpia, int try)
	424	{
	425	if (!ucpia->streaming)
	426	return;
	427
	428	ucpia->streaming = 0;
	429
	430	/* Set packet size to 0 */
	431	if (try) {
	432	int ret;
	433
	434	ret = usb_set_interface(ucpia->dev, ucpia->iface, 0);
	435	if (ret < 0) {
	436	printk(KERN_ERR "usb_set_interface error (ret = %d)\n", ret);
	437	return;
	438	}
	439	}
	440
	441	/* Unschedule all of the iso td's */
	442	if (ucpia->sbuf[1].urb) {
	443	usb_kill_urb(ucpia->sbuf[1].urb);
	444	usb_free_urb(ucpia->sbuf[1].urb);
	445	ucpia->sbuf[1].urb = NULL;
	446	}
	447
f9101210 JJ	448	kfree(ucpia->sbuf[1].data);
f9101210 JJ	449	ucpia->sbuf[1].data = NULL;
d56410e0	450
1da177e4 LT	451	if (ucpia->sbuf[0].urb) {
	452	usb_kill_urb(ucpia->sbuf[0].urb);
	453	usb_free_urb(ucpia->sbuf[0].urb);
	454	ucpia->sbuf[0].urb = NULL;
	455	}
	456
f9101210 JJ	457	kfree(ucpia->sbuf[0].data);
f9101210 JJ	458	ucpia->sbuf[0].data = NULL;
1da177e4 LT	459	}
	460
	461	static int cpia_usb_close(void *privdata)
	462	{
	463	struct usb_cpia ucpia = (struct usb_cpia ) privdata;
	464
	465	if(!ucpia)
	466	return -ENODEV;
	467
	468	ucpia->open = 0;
	469
	470	/* ucpia->present = 0 protects against trying to reset the
	471	* alt setting if camera is physically disconnected while open */
	472	cpia_usb_free_resources(ucpia, ucpia->present);
	473
	474	return 0;
	475	}
	476
1da177e4 LT	477	/* Probing and initializing */
	478
	479	static int cpia_probe(struct usb_interface *intf,
	480	const struct usb_device_id *id)
	481	{
	482	struct usb_device *udev = interface_to_usbdev(intf);
	483	struct usb_host_interface *interface;
	484	struct usb_cpia *ucpia;
	485	struct cam_data *cam;
	486	int ret;
d56410e0	487
1da177e4 LT	488	/* A multi-config CPiA camera? */
	489	if (udev->descriptor.bNumConfigurations != 1)
	490	return -ENODEV;
	491
	492	interface = intf->cur_altsetting;
	493
	494	printk(KERN_INFO "USB CPiA camera found\n");
	495
7408187d	496	ucpia = kzalloc(sizeof(*ucpia), GFP_KERNEL);
1da177e4 LT	497	if (!ucpia) {
	498	printk(KERN_ERR "couldn't kmalloc cpia struct\n");
	499	return -ENOMEM;
	500	}
	501
1da177e4 LT	502	ucpia->dev = udev;
	503	ucpia->iface = interface->desc.bInterfaceNumber;
	504	init_waitqueue_head(&ucpia->wq_stream);
	505
	506	ucpia->buffers[0] = vmalloc(sizeof(*ucpia->buffers[0]));
	507	if (!ucpia->buffers[0]) {
	508	printk(KERN_ERR "couldn't vmalloc frame buffer 0\n");
	509	goto fail_alloc_0;
	510	}
	511
	512	ucpia->buffers[1] = vmalloc(sizeof(*ucpia->buffers[1]));
	513	if (!ucpia->buffers[1]) {
	514	printk(KERN_ERR "couldn't vmalloc frame buffer 1\n");
	515	goto fail_alloc_1;
	516	}
	517
	518	ucpia->buffers[2] = vmalloc(sizeof(*ucpia->buffers[2]));
	519	if (!ucpia->buffers[2]) {
	520	printk(KERN_ERR "couldn't vmalloc frame buffer 2\n");
	521	goto fail_alloc_2;
	522	}
	523
	524	ucpia->buffers[0]->next = ucpia->buffers[1];
	525	ucpia->buffers[1]->next = ucpia->buffers[2];
	526	ucpia->buffers[2]->next = ucpia->buffers[0];
	527
	528	ret = usb_set_interface(udev, ucpia->iface, 0);
	529	if (ret < 0) {
	530	printk(KERN_ERR "cpia_probe: usb_set_interface error (ret = %d)\n", ret);
	531	/* goto fail_all; */
	532	}
	533
	534	/* Before register_camera, important */
	535	ucpia->present = 1;
d56410e0	536
1da177e4 LT	537	cam = cpia_register_camera(&cpia_usb_ops, ucpia);
	538	if (!cam) {
	539	LOG("failed to cpia_register_camera\n");
	540	goto fail_all;
	541	}
	542
	543	spin_lock( &cam_list_lock_usb );
	544	list_add( &cam->cam_data_list, &cam_list );
	545	spin_unlock( &cam_list_lock_usb );
	546
	547	usb_set_intfdata(intf, cam);
	548	return 0;
	549
	550	fail_all:
	551	vfree(ucpia->buffers[2]);
	552	ucpia->buffers[2] = NULL;
	553	fail_alloc_2:
	554	vfree(ucpia->buffers[1]);
	555	ucpia->buffers[1] = NULL;
	556	fail_alloc_1:
	557	vfree(ucpia->buffers[0]);
	558	ucpia->buffers[0] = NULL;
	559	fail_alloc_0:
	560	kfree(ucpia);
	561	return -EIO;
	562	}
	563
	564	static void cpia_disconnect(struct usb_interface *intf);
	565
	566	static struct usb_device_id cpia_id_table [] = {
	567	{ USB_DEVICE(0x0553, 0x0002) },
	568	{ USB_DEVICE(0x0813, 0x0001) },
	569	{ } /* Terminating entry */
	570	};
	571
	572	MODULE_DEVICE_TABLE (usb, cpia_id_table);
	573	MODULE_LICENSE("GPL");
	574
	575
	576	static struct usb_driver cpia_driver = {
1da177e4 LT	577	.name = "cpia",
	578	.probe = cpia_probe,
	579	.disconnect = cpia_disconnect,
	580	.id_table = cpia_id_table,
	581	};
	582
	583	static void cpia_disconnect(struct usb_interface *intf)
	584	{
	585	struct cam_data *cam = usb_get_intfdata(intf);
	586	struct usb_cpia *ucpia;
d56410e0	587
1da177e4 LT	588	usb_set_intfdata(intf, NULL);
	589	if (!cam)
	590	return;
	591
	592	ucpia = (struct usb_cpia *) cam->lowlevel_data;
	593	spin_lock( &cam_list_lock_usb );
	594	list_del(&cam->cam_data_list);
	595	spin_unlock( &cam_list_lock_usb );
d56410e0	596
1da177e4 LT	597	ucpia->present = 0;
	598
	599	cpia_unregister_camera(cam);
	600	if(ucpia->open)
	601	cpia_usb_close(cam->lowlevel_data);
	602
	603	ucpia->curbuff->status = FRAME_ERROR;
	604
	605	if (waitqueue_active(&ucpia->wq_stream))
	606	wake_up_interruptible(&ucpia->wq_stream);
	607
1da177e4 LT	608	ucpia->curbuff = ucpia->workbuff = NULL;
1da177e4 LT	609
f9101210 JJ	610	vfree(ucpia->buffers[2]);
f9101210 JJ	611	ucpia->buffers[2] = NULL;
1da177e4	612
f9101210 JJ	613	vfree(ucpia->buffers[1]);
f9101210 JJ	614	ucpia->buffers[1] = NULL;
1da177e4	615
f9101210 JJ	616	vfree(ucpia->buffers[0]);
f9101210 JJ	617	ucpia->buffers[0] = NULL;
1da177e4 LT	618
	619	cam->lowlevel_data = NULL;
	620	kfree(ucpia);
	621	}
	622
	623	static int __init usb_cpia_init(void)
	624	{
d56410e0	625	printk(KERN_INFO "%s v%d.%d.%d\n",ABOUT,
1da177e4 LT	626	CPIA_USB_MAJ_VER,CPIA_USB_MIN_VER,CPIA_USB_PATCH_VER);
	627
	628	spin_lock_init(&cam_list_lock_usb);
	629	return usb_register(&cpia_driver);
	630	}
	631
	632	static void __exit usb_cpia_cleanup(void)
	633	{
	634	usb_deregister(&cpia_driver);
	635	}
	636
	637
	638	module_init (usb_cpia_init);
	639	module_exit (usb_cpia_cleanup);
	640