drivers/media/pci/ttpci/av7110_ca.c - arm/linux-arm64-legacy - Git at Google

 /*
  * av7110_ca.c: CA and CI stuff
  *
  * Copyright (C) 1999-2002 Ralph  Metzler
  *                       & Marcus Metzler for convergence integrated media GmbH
  *
  * originally based on code by:
  * Copyright (C) 1998,1999 Christian Theiss <mistert@rz.fh-augsburg.de>
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
  * as published by the Free Software Foundation; either version 2
  * of the License, or (at your option) any later version.
  *
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  * Or, point your browser to http://www.gnu.org/copyleft/gpl.html
  *
  *
  * the project's page is at http://www.linuxtv.org/
  */

 #include <linux/kernel.h>
 #include <linux/types.h>
 #include <linux/delay.h>
 #include <linux/fs.h>
 #include <linux/timer.h>
 #include <linux/poll.h>
 #include <linux/gfp.h>

 #include "av7110.h"
 #include "av7110_hw.h"
 #include "av7110_ca.h"


 void CI_handle(struct av7110 *av7110, u8 *data, u16 len)
 {
 	dprintk(8, "av7110:%p\n",av7110);

 	if (len < 3)
 		return;
 	switch (data[0]) {
 	case CI_MSG_CI_INFO:
 		if (data[2] != 1 && data[2] != 2)
 			break;
 		switch (data[1]) {
 		case 0:
 			av7110->ci_slot[data[2] - 1].flags = 0;
 			break;
 		case 1:
 			av7110->ci_slot[data[2] - 1].flags |= CA_CI_MODULE_PRESENT;
 			break;
 		case 2:
 			av7110->ci_slot[data[2] - 1].flags |= CA_CI_MODULE_READY;
 			break;
 		}
 		break;
 	case CI_SWITCH_PRG_REPLY:
 		//av7110->ci_stat=data[1];
 		break;
 	default:
 		break;
 	}
 }


 void ci_get_data(struct dvb_ringbuffer *cibuf, u8 *data, int len)
 {
 	if (dvb_ringbuffer_free(cibuf) < len + 2)
 		return;

 	DVB_RINGBUFFER_WRITE_BYTE(cibuf, len >> 8);
 	DVB_RINGBUFFER_WRITE_BYTE(cibuf, len & 0xff);
 	dvb_ringbuffer_write(cibuf, data, len);
 	wake_up_interruptible(&cibuf->queue);
 }


 /******************************************************************************
  * CI link layer file ops
  ******************************************************************************/

 static int ci_ll_init(struct dvb_ringbuffer *cirbuf, struct dvb_ringbuffer *ciwbuf, int size)
 {
 	struct dvb_ringbuffer *tab[] = { cirbuf, ciwbuf, NULL }, **p;
 	void *data;

 	for (p = tab; *p; p++) {
 		data = vmalloc(size);
 		if (!data) {
 			while (p-- != tab) {
 				vfree(p[0]->data);
 				p[0]->data = NULL;
 			}
 			return -ENOMEM;
 		}
 		dvb_ringbuffer_init(*p, data, size);
 	}
 	return 0;
 }

 static void ci_ll_flush(struct dvb_ringbuffer *cirbuf, struct dvb_ringbuffer *ciwbuf)
 {
 	dvb_ringbuffer_flush_spinlock_wakeup(cirbuf);
 	dvb_ringbuffer_flush_spinlock_wakeup(ciwbuf);
 }

 static void ci_ll_release(struct dvb_ringbuffer *cirbuf, struct dvb_ringbuffer *ciwbuf)
 {
 	vfree(cirbuf->data);
 	cirbuf->data = NULL;
 	vfree(ciwbuf->data);
 	ciwbuf->data = NULL;
 }

 static int ci_ll_reset(struct dvb_ringbuffer *cibuf, struct file *file,
 		       int slots, ca_slot_info_t *slot)
 {
 	int i;
 	int len = 0;
 	u8 msg[8] = { 0x00, 0x06, 0x00, 0x00, 0xff, 0x02, 0x00, 0x00 };

 	for (i = 0; i < 2; i++) {
 		if (slots & (1 << i))
 			len += 8;
 	}

 	if (dvb_ringbuffer_free(cibuf) < len)
 		return -EBUSY;

 	for (i = 0; i < 2; i++) {
 		if (slots & (1 << i)) {
 			msg[2] = i;
 			dvb_ringbuffer_write(cibuf, msg, 8);
 			slot[i].flags = 0;
 		}
 	}

 	return 0;
 }

 static ssize_t ci_ll_write(struct dvb_ringbuffer *cibuf, struct file *file,
 			   const char __user *buf, size_t count, loff_t *ppos)
 {
 	int free;
 	int non_blocking = file->f_flags & O_NONBLOCK;
 	u8 *page = (u8 *)__get_free_page(GFP_USER);
 	int res;

 	if (!page)
 		return -ENOMEM;

 	res = -EINVAL;
 	if (count > 2048)
 		goto out;

 	res = -EFAULT;
 	if (copy_from_user(page, buf, count))
 		goto out;

 	free = dvb_ringbuffer_free(cibuf);
 	if (count + 2 > free) {
 		res = -EWOULDBLOCK;
 		if (non_blocking)
 			goto out;
 		res = -ERESTARTSYS;
 		if (wait_event_interruptible(cibuf->queue,
 					     (dvb_ringbuffer_free(cibuf) >= count + 2)))
 			goto out;
 	}

 	DVB_RINGBUFFER_WRITE_BYTE(cibuf, count >> 8);
 	DVB_RINGBUFFER_WRITE_BYTE(cibuf, count & 0xff);

 	res = dvb_ringbuffer_write(cibuf, page, count);
 out:
 	free_page((unsigned long)page);
 	return res;
 }

 static ssize_t ci_ll_read(struct dvb_ringbuffer *cibuf, struct file *file,
 			  char __user *buf, size_t count, loff_t *ppos)
 {
 	int avail;
 	int non_blocking = file->f_flags & O_NONBLOCK;
 	ssize_t len;

 	if (!cibuf->data || !count)
 		return 0;
 	if (non_blocking && (dvb_ringbuffer_empty(cibuf)))
 		return -EWOULDBLOCK;
 	if (wait_event_interruptible(cibuf->queue,
 				     !dvb_ringbuffer_empty(cibuf)))
 		return -ERESTARTSYS;
 	avail = dvb_ringbuffer_avail(cibuf);
 	if (avail < 4)
 		return 0;
 	len = DVB_RINGBUFFER_PEEK(cibuf, 0) << 8;
 	len |= DVB_RINGBUFFER_PEEK(cibuf, 1);
 	if (avail < len + 2 || count < len)
 		return -EINVAL;
 	DVB_RINGBUFFER_SKIP(cibuf, 2);

 	return dvb_ringbuffer_read_user(cibuf, buf, len);
 }

 static int dvb_ca_open(struct inode *inode, struct file *file)
 {
 	struct dvb_device *dvbdev = file->private_data;
 	struct av7110 *av7110 = dvbdev->priv;
 	int err = dvb_generic_open(inode, file);

 	dprintk(8, "av7110:%p\n",av7110);

 	if (err < 0)
 		return err;
 	ci_ll_flush(&av7110->ci_rbuffer, &av7110->ci_wbuffer);
 	return 0;
 }

 static unsigned int dvb_ca_poll (struct file *file, poll_table *wait)
 {
 	struct dvb_device *dvbdev = file->private_data;
 	struct av7110 *av7110 = dvbdev->priv;
 	struct dvb_ringbuffer *rbuf = &av7110->ci_rbuffer;
 	struct dvb_ringbuffer *wbuf = &av7110->ci_wbuffer;
 	unsigned int mask = 0;

 	dprintk(8, "av7110:%p\n",av7110);

 	poll_wait(file, &rbuf->queue, wait);
 	poll_wait(file, &wbuf->queue, wait);

 	if (!dvb_ringbuffer_empty(rbuf))
 		mask |= (POLLIN | POLLRDNORM);

 	if (dvb_ringbuffer_free(wbuf) > 1024)
 		mask |= (POLLOUT | POLLWRNORM);

 	return mask;
 }

 static int dvb_ca_ioctl(struct file *file, unsigned int cmd, void *parg)
 {
 	struct dvb_device *dvbdev = file->private_data;
 	struct av7110 *av7110 = dvbdev->priv;
 	unsigned long arg = (unsigned long) parg;
 	int ret = 0;

 	dprintk(8, "av7110:%p\n",av7110);

 	if (mutex_lock_interruptible(&av7110->ioctl_mutex))
 		return -ERESTARTSYS;

 	switch (cmd) {
 	case CA_RESET:
 		ret = ci_ll_reset(&av7110->ci_wbuffer, file, arg,
 				  &av7110->ci_slot[0]);
 		break;
 	case CA_GET_CAP:
 	{
 		ca_caps_t cap;

 		cap.slot_num = 2;
 		cap.slot_type = (FW_CI_LL_SUPPORT(av7110->arm_app) ?
 				 CA_CI_LINK : CA_CI) | CA_DESCR;
 		cap.descr_num = 16;
 		cap.descr_type = CA_ECD;
 		memcpy(parg, &cap, sizeof(cap));
 		break;
 	}

 	case CA_GET_SLOT_INFO:
 	{
 		ca_slot_info_t *info=(ca_slot_info_t *)parg;

 		if (info->num < 0 || info->num > 1) {
 			mutex_unlock(&av7110->ioctl_mutex);
 			return -EINVAL;
 		}
 		av7110->ci_slot[info->num].num = info->num;
 		av7110->ci_slot[info->num].type = FW_CI_LL_SUPPORT(av7110->arm_app) ?
 							CA_CI_LINK : CA_CI;
 		memcpy(info, &av7110->ci_slot[info->num], sizeof(ca_slot_info_t));
 		break;
 	}

 	case CA_GET_MSG:
 		break;

 	case CA_SEND_MSG:
 		break;

 	case CA_GET_DESCR_INFO:
 	{
 		ca_descr_info_t info;

 		info.num = 16;
 		info.type = CA_ECD;
 		memcpy(parg, &info, sizeof (info));
 		break;
 	}

 	case CA_SET_DESCR:
 	{
 		ca_descr_t *descr = (ca_descr_t*) parg;

 		if (descr->index >= 16 || descr->parity > 1) {
 			mutex_unlock(&av7110->ioctl_mutex);
 			return -EINVAL;
 		}
 		av7110_fw_cmd(av7110, COMTYPE_PIDFILTER, SetDescr, 5,
 			      (descr->index<<8)|descr->parity,
 			      (descr->cw[0]<<8)|descr->cw[1],
 			      (descr->cw[2]<<8)|descr->cw[3],
 			      (descr->cw[4]<<8)|descr->cw[5],
 			      (descr->cw[6]<<8)|descr->cw[7]);
 		break;
 	}

 	default:
 		ret = -EINVAL;
 		break;
 	}

 	mutex_unlock(&av7110->ioctl_mutex);
 	return ret;
 }

 static ssize_t dvb_ca_write(struct file *file, const char __user *buf,
 			    size_t count, loff_t *ppos)
 {
 	struct dvb_device *dvbdev = file->private_data;
 	struct av7110 *av7110 = dvbdev->priv;

 	dprintk(8, "av7110:%p\n",av7110);
 	return ci_ll_write(&av7110->ci_wbuffer, file, buf, count, ppos);
 }

 static ssize_t dvb_ca_read(struct file *file, char __user *buf,
 			   size_t count, loff_t *ppos)
 {
 	struct dvb_device *dvbdev = file->private_data;
 	struct av7110 *av7110 = dvbdev->priv;

 	dprintk(8, "av7110:%p\n",av7110);
 	return ci_ll_read(&av7110->ci_rbuffer, file, buf, count, ppos);
 }

 static const struct file_operations dvb_ca_fops = {
 	.owner		= THIS_MODULE,
 	.read		= dvb_ca_read,
 	.write		= dvb_ca_write,
 	.unlocked_ioctl	= dvb_generic_ioctl,
 	.open		= dvb_ca_open,
 	.release	= dvb_generic_release,
 	.poll		= dvb_ca_poll,
 	.llseek		= default_llseek,
 };

 static struct dvb_device dvbdev_ca = {
 	.priv		= NULL,
 	.users		= 1,
 	.writers	= 1,
 	.fops		= &dvb_ca_fops,
 	.kernel_ioctl	= dvb_ca_ioctl,
 };


 int av7110_ca_register(struct av7110 *av7110)
 {
 	return dvb_register_device(&av7110->dvb_adapter, &av7110->ca_dev,
 				   &dvbdev_ca, av7110, DVB_DEVICE_CA);
 }

 void av7110_ca_unregister(struct av7110 *av7110)
 {
 	dvb_unregister_device(av7110->ca_dev);
 }

 int av7110_ca_init(struct av7110* av7110)
 {
 	return ci_ll_init(&av7110->ci_rbuffer, &av7110->ci_wbuffer, 8192);
 }

 void av7110_ca_exit(struct av7110* av7110)
 {
 	ci_ll_release(&av7110->ci_rbuffer, &av7110->ci_wbuffer);
 }
	/*
	* av7110_ca.c: CA and CI stuff
	*
	* Copyright (C) 1999-2002 Ralph Metzler
	* & Marcus Metzler for convergence integrated media GmbH
	*
	* originally based on code by:
	* Copyright (C) 1998,1999 Christian Theiss <mistert@rz.fh-augsburg.de>
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License
	* as published by the Free Software Foundation; either version 2
	* of the License, or (at your option) any later version.
	*
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	* Or, point your browser to http://www.gnu.org/copyleft/gpl.html
	*
	*
	* the project's page is at http://www.linuxtv.org/
	*/

	#include <linux/kernel.h>
	#include <linux/types.h>
	#include <linux/delay.h>
	#include <linux/fs.h>
	#include <linux/timer.h>
	#include <linux/poll.h>
	#include <linux/gfp.h>

	#include "av7110.h"
	#include "av7110_hw.h"
	#include "av7110_ca.h"


	void CI_handle(struct av7110 av7110, u8 data, u16 len)
	{
	dprintk(8, "av7110:%p\n",av7110);

	if (len < 3)
	return;
	switch (data[0]) {
	case CI_MSG_CI_INFO:
	if (data[2] != 1 && data[2] != 2)
	break;
	switch (data[1]) {
	case 0:
	av7110->ci_slot[data[2] - 1].flags = 0;
	break;
	case 1:
	av7110->ci_slot[data[2] - 1].flags \|= CA_CI_MODULE_PRESENT;
	break;
	case 2:
	av7110->ci_slot[data[2] - 1].flags \|= CA_CI_MODULE_READY;
	break;
	}
	break;
	case CI_SWITCH_PRG_REPLY:
	//av7110->ci_stat=data[1];
	break;
	default:
	break;
	}
	}


	void ci_get_data(struct dvb_ringbuffer cibuf, u8 data, int len)
	{
	if (dvb_ringbuffer_free(cibuf) < len + 2)
	return;

	DVB_RINGBUFFER_WRITE_BYTE(cibuf, len >> 8);
	DVB_RINGBUFFER_WRITE_BYTE(cibuf, len & 0xff);
	dvb_ringbuffer_write(cibuf, data, len);
	wake_up_interruptible(&cibuf->queue);
	}


	/******************************************************************************
	* CI link layer file ops
	******************************************************************************/

	static int ci_ll_init(struct dvb_ringbuffer cirbuf, struct dvb_ringbuffer ciwbuf, int size)
	{
	struct dvb_ringbuffer tab[] = { cirbuf, ciwbuf, NULL }, *p;
	void *data;

	for (p = tab; *p; p++) {
	data = vmalloc(size);
	if (!data) {
	while (p-- != tab) {
	vfree(p[0]->data);
	p[0]->data = NULL;
	}
	return -ENOMEM;
	}
	dvb_ringbuffer_init(*p, data, size);
	}
	return 0;
	}

	static void ci_ll_flush(struct dvb_ringbuffer cirbuf, struct dvb_ringbuffer ciwbuf)
	{
	dvb_ringbuffer_flush_spinlock_wakeup(cirbuf);
	dvb_ringbuffer_flush_spinlock_wakeup(ciwbuf);
	}

	static void ci_ll_release(struct dvb_ringbuffer cirbuf, struct dvb_ringbuffer ciwbuf)
	{
	vfree(cirbuf->data);
	cirbuf->data = NULL;
	vfree(ciwbuf->data);
	ciwbuf->data = NULL;
	}

	static int ci_ll_reset(struct dvb_ringbuffer cibuf, struct file file,
	int slots, ca_slot_info_t *slot)
	{
	int i;
	int len = 0;
	u8 msg[8] = { 0x00, 0x06, 0x00, 0x00, 0xff, 0x02, 0x00, 0x00 };

	for (i = 0; i < 2; i++) {
	if (slots & (1 << i))
	len += 8;
	}

	if (dvb_ringbuffer_free(cibuf) < len)
	return -EBUSY;

	for (i = 0; i < 2; i++) {
	if (slots & (1 << i)) {
	msg[2] = i;
	dvb_ringbuffer_write(cibuf, msg, 8);
	slot[i].flags = 0;
	}
	}

	return 0;
	}

	static ssize_t ci_ll_write(struct dvb_ringbuffer cibuf, struct file file,
	const char __user buf, size_t count, loff_t ppos)
	{
	int free;
	int non_blocking = file->f_flags & O_NONBLOCK;
	u8 page = (u8 )__get_free_page(GFP_USER);
	int res;

	if (!page)
	return -ENOMEM;

	res = -EINVAL;
	if (count > 2048)
	goto out;

	res = -EFAULT;
	if (copy_from_user(page, buf, count))
	goto out;

	free = dvb_ringbuffer_free(cibuf);
	if (count + 2 > free) {
	res = -EWOULDBLOCK;
	if (non_blocking)
	goto out;
	res = -ERESTARTSYS;
	if (wait_event_interruptible(cibuf->queue,
	(dvb_ringbuffer_free(cibuf) >= count + 2)))
	goto out;
	}

	DVB_RINGBUFFER_WRITE_BYTE(cibuf, count >> 8);
	DVB_RINGBUFFER_WRITE_BYTE(cibuf, count & 0xff);

	res = dvb_ringbuffer_write(cibuf, page, count);
	out:
	free_page((unsigned long)page);
	return res;
	}

	static ssize_t ci_ll_read(struct dvb_ringbuffer cibuf, struct file file,
	char __user buf, size_t count, loff_t ppos)
	{
	int avail;
	int non_blocking = file->f_flags & O_NONBLOCK;
	ssize_t len;

	if (!cibuf->data \|\| !count)
	return 0;
	if (non_blocking && (dvb_ringbuffer_empty(cibuf)))
	return -EWOULDBLOCK;
	if (wait_event_interruptible(cibuf->queue,
	!dvb_ringbuffer_empty(cibuf)))
	return -ERESTARTSYS;
	avail = dvb_ringbuffer_avail(cibuf);
	if (avail < 4)
	return 0;
	len = DVB_RINGBUFFER_PEEK(cibuf, 0) << 8;
	len \|= DVB_RINGBUFFER_PEEK(cibuf, 1);
	if (avail < len + 2 \|\| count < len)
	return -EINVAL;
	DVB_RINGBUFFER_SKIP(cibuf, 2);

	return dvb_ringbuffer_read_user(cibuf, buf, len);
	}

	static int dvb_ca_open(struct inode inode, struct file file)
	{
	struct dvb_device *dvbdev = file->private_data;
	struct av7110 *av7110 = dvbdev->priv;
	int err = dvb_generic_open(inode, file);

	dprintk(8, "av7110:%p\n",av7110);

	if (err < 0)
	return err;
	ci_ll_flush(&av7110->ci_rbuffer, &av7110->ci_wbuffer);
	return 0;
	}

	static unsigned int dvb_ca_poll (struct file file, poll_table wait)
	{
	struct dvb_device *dvbdev = file->private_data;
	struct av7110 *av7110 = dvbdev->priv;
	struct dvb_ringbuffer *rbuf = &av7110->ci_rbuffer;
	struct dvb_ringbuffer *wbuf = &av7110->ci_wbuffer;
	unsigned int mask = 0;

	dprintk(8, "av7110:%p\n",av7110);

	poll_wait(file, &rbuf->queue, wait);
	poll_wait(file, &wbuf->queue, wait);

	if (!dvb_ringbuffer_empty(rbuf))
	mask \|= (POLLIN \| POLLRDNORM);

	if (dvb_ringbuffer_free(wbuf) > 1024)
	mask \|= (POLLOUT \| POLLWRNORM);

	return mask;
	}

	static int dvb_ca_ioctl(struct file file, unsigned int cmd, void parg)
	{
	struct dvb_device *dvbdev = file->private_data;
	struct av7110 *av7110 = dvbdev->priv;
	unsigned long arg = (unsigned long) parg;
	int ret = 0;

	dprintk(8, "av7110:%p\n",av7110);

	if (mutex_lock_interruptible(&av7110->ioctl_mutex))
	return -ERESTARTSYS;

	switch (cmd) {
	case CA_RESET:
	ret = ci_ll_reset(&av7110->ci_wbuffer, file, arg,
	&av7110->ci_slot[0]);
	break;
	case CA_GET_CAP:
	{
	ca_caps_t cap;

	cap.slot_num = 2;
	cap.slot_type = (FW_CI_LL_SUPPORT(av7110->arm_app) ?
	CA_CI_LINK : CA_CI) \| CA_DESCR;
	cap.descr_num = 16;
	cap.descr_type = CA_ECD;
	memcpy(parg, &cap, sizeof(cap));
	break;
	}

	case CA_GET_SLOT_INFO:
	{
	ca_slot_info_t info=(ca_slot_info_t )parg;

	if (info->num < 0 \|\| info->num > 1) {
	mutex_unlock(&av7110->ioctl_mutex);
	return -EINVAL;
	}
	av7110->ci_slot[info->num].num = info->num;
	av7110->ci_slot[info->num].type = FW_CI_LL_SUPPORT(av7110->arm_app) ?
	CA_CI_LINK : CA_CI;
	memcpy(info, &av7110->ci_slot[info->num], sizeof(ca_slot_info_t));
	break;
	}

	case CA_GET_MSG:
	break;

	case CA_SEND_MSG:
	break;

	case CA_GET_DESCR_INFO:
	{
	ca_descr_info_t info;

	info.num = 16;
	info.type = CA_ECD;
	memcpy(parg, &info, sizeof (info));
	break;
	}

	case CA_SET_DESCR:
	{
	ca_descr_t descr = (ca_descr_t) parg;

	if (descr->index >= 16 \|\| descr->parity > 1) {
	mutex_unlock(&av7110->ioctl_mutex);
	return -EINVAL;
	}
	av7110_fw_cmd(av7110, COMTYPE_PIDFILTER, SetDescr, 5,
	(descr->index<<8)\|descr->parity,
	(descr->cw[0]<<8)\|descr->cw[1],
	(descr->cw[2]<<8)\|descr->cw[3],
	(descr->cw[4]<<8)\|descr->cw[5],
	(descr->cw[6]<<8)\|descr->cw[7]);
	break;
	}

	default:
	ret = -EINVAL;
	break;
	}

	mutex_unlock(&av7110->ioctl_mutex);
	return ret;
	}

	static ssize_t dvb_ca_write(struct file file, const char __user buf,
	size_t count, loff_t *ppos)
	{
	struct dvb_device *dvbdev = file->private_data;
	struct av7110 *av7110 = dvbdev->priv;

	dprintk(8, "av7110:%p\n",av7110);
	return ci_ll_write(&av7110->ci_wbuffer, file, buf, count, ppos);
	}

	static ssize_t dvb_ca_read(struct file file, char __user buf,
	size_t count, loff_t *ppos)
	{
	struct dvb_device *dvbdev = file->private_data;
	struct av7110 *av7110 = dvbdev->priv;

	dprintk(8, "av7110:%p\n",av7110);
	return ci_ll_read(&av7110->ci_rbuffer, file, buf, count, ppos);
	}

	static const struct file_operations dvb_ca_fops = {
	.owner = THIS_MODULE,
	.read = dvb_ca_read,
	.write = dvb_ca_write,
	.unlocked_ioctl = dvb_generic_ioctl,
	.open = dvb_ca_open,
	.release = dvb_generic_release,
	.poll = dvb_ca_poll,
	.llseek = default_llseek,
	};

	static struct dvb_device dvbdev_ca = {
	.priv = NULL,
	.users = 1,
	.writers = 1,
	.fops = &dvb_ca_fops,
	.kernel_ioctl = dvb_ca_ioctl,
	};


	int av7110_ca_register(struct av7110 *av7110)
	{
	return dvb_register_device(&av7110->dvb_adapter, &av7110->ca_dev,
	&dvbdev_ca, av7110, DVB_DEVICE_CA);
	}

	void av7110_ca_unregister(struct av7110 *av7110)
	{
	dvb_unregister_device(av7110->ca_dev);
	}

	int av7110_ca_init(struct av7110* av7110)
	{
	return ci_ll_init(&av7110->ci_rbuffer, &av7110->ci_wbuffer, 8192);
	}

	void av7110_ca_exit(struct av7110* av7110)
	{
	ci_ll_release(&av7110->ci_rbuffer, &av7110->ci_wbuffer);
	}