av7110_ca.c

Go to the documentation of this file.

/*
 * 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 <[email protected]>
 *
 * 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;

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

    switch (cmd) {
    case CA_RESET:
        return 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)
            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)
            return -EINVAL;
        if (descr->parity > 1)
            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:
        return -EINVAL;
    }
    return 0;
}

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);
}