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/*

 *

 * some helper function for simple DVB cards which simply DMA the

 * complete transport stream and let the computer sort everything else

 * (i.e. we are using the software demux, ...).  Also uses the

 * video-buf to manage DMA buffers.

 *

 * (c) 2004 Gerd Knorr <kraxel@bytesex.org> [SUSE Labs]

 *

 * 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.

 */

#include <linux/module.h>

#include <linux/init.h>

#include <linux/device.h>

#include <linux/fs.h>

#include <linux/kthread.h>

#include <linux/file.h>

#include <linux/freezer.h>

#include <media/videobuf-dma-sg.h>

#include <media/videobuf-dvb.h>

/* ------------------------------------------------------------------ */

MODULE_AUTHOR("Gerd Knorr <kraxel@bytesex.org> [SuSE Labs]");

MODULE_LICENSE("GPL");

static unsigned int debug = 0;

module_param(debug, int, 0644);

MODULE_PARM_DESC(debug,"enable debug messages");

#define dprintk(fmt, arg...)    if (debug)                      \

        printk(KERN_DEBUG "%s/dvb: " fmt, dvb->name , ## arg)

/* ------------------------------------------------------------------ */

static int videobuf_dvb_thread(void *data)

{

        struct videobuf_dvb *dvb = data;

        struct videobuf_buffer *buf;

        unsigned long flags;

        int err;

        struct videobuf_dmabuf *dma;

        dprintk("dvb thread started\n");

        set_freezable();

        videobuf_read_start(&dvb->dvbq);

        for (;;) {

                /* fetch next buffer */

                buf = list_entry(dvb->dvbq.stream.next,

                                 struct videobuf_buffer, stream);

                list_del(&buf->stream);

                err = videobuf_waiton(buf,0,1);

                /* no more feeds left or stop_feed() asked us to quit */

                if (0 == dvb->nfeeds)

                        break;

                if (kthread_should_stop())

                        break;

                try_to_freeze();

                /* feed buffer data to demux */

                dma=videobuf_to_dma(buf);

                if (buf->state == STATE_DONE)

                        dvb_dmx_swfilter(&dvb->demux, dma->vmalloc,

                                         buf->size);

                /* requeue buffer */

                list_add_tail(&buf->stream,&dvb->dvbq.stream);

                spin_lock_irqsave(dvb->dvbq.irqlock,flags);

                dvb->dvbq.ops->buf_queue(&dvb->dvbq,buf);

                spin_unlock_irqrestore(dvb->dvbq.irqlock,flags);

        }

        videobuf_read_stop(&dvb->dvbq);

        dprintk("dvb thread stopped\n");

        /* Hmm, linux becomes *very* unhappy without this ... */

        while (!kthread_should_stop()) {

                set_current_state(TASK_INTERRUPTIBLE);

                schedule();

        }

        return 0;

}

static int videobuf_dvb_start_feed(struct dvb_demux_feed *feed)

{

        struct dvb_demux *demux  = feed->demux;

        struct videobuf_dvb *dvb = demux->priv;

        int rc;

        if (!demux->dmx.frontend)

                return -EINVAL;

        mutex_lock(&dvb->lock);

        dvb->nfeeds++;

        rc = dvb->nfeeds;

        if (NULL != dvb->thread)

                goto out;

        dvb->thread = kthread_run(videobuf_dvb_thread,

                                  dvb, "%s dvb", dvb->name);

        if (IS_ERR(dvb->thread)) {

                rc = PTR_ERR(dvb->thread);

                dvb->thread = NULL;

        }

out:

        mutex_unlock(&dvb->lock);

        return rc;

}

static int videobuf_dvb_stop_feed(struct dvb_demux_feed *feed)

{

        struct dvb_demux *demux  = feed->demux;

        struct videobuf_dvb *dvb = demux->priv;

        int err = 0;

        mutex_lock(&dvb->lock);

        dvb->nfeeds--;

        if (0 == dvb->nfeeds  &&  NULL != dvb->thread) {

                // FIXME: cx8802_cancel_buffers(dev);

                err = kthread_stop(dvb->thread);

                dvb->thread = NULL;

        }

        mutex_unlock(&dvb->lock);

        return err;

}

/* ------------------------------------------------------------------ */

int videobuf_dvb_register(struct videobuf_dvb *dvb,

                          struct module *module,

                          void *adapter_priv,

                          struct device *device)

{

        int result;

        mutex_init(&dvb->lock);

        /* register adapter */

        result = dvb_register_adapter(&dvb->adapter, dvb->name, module, device);

        if (result < 0) {

                printk(KERN_WARNING "%s: dvb_register_adapter failed (errno = %d)\n",

                       dvb->name, result);

                goto fail_adapter;

        }

        dvb->adapter.priv = adapter_priv;

        /* register frontend */

        result = dvb_register_frontend(&dvb->adapter, dvb->frontend);

        if (result < 0) {

                printk(KERN_WARNING "%s: dvb_register_frontend failed (errno = %d)\n",

                       dvb->name, result);

                goto fail_frontend;

        }

        /* register demux stuff */

        dvb->demux.dmx.capabilities =

                DMX_TS_FILTERING | DMX_SECTION_FILTERING |

                DMX_MEMORY_BASED_FILTERING;

        dvb->demux.priv       = dvb;

        dvb->demux.filternum  = 256;

        dvb->demux.feednum    = 256;

        dvb->demux.start_feed = videobuf_dvb_start_feed;

        dvb->demux.stop_feed  = videobuf_dvb_stop_feed;

        result = dvb_dmx_init(&dvb->demux);

        if (result < 0) {

                printk(KERN_WARNING "%s: dvb_dmx_init failed (errno = %d)\n",

                       dvb->name, result);

                goto fail_dmx;

        }

        dvb->dmxdev.filternum    = 256;

        dvb->dmxdev.demux        = &dvb->demux.dmx;

        dvb->dmxdev.capabilities = 0;

        result = dvb_dmxdev_init(&dvb->dmxdev, &dvb->adapter);

        if (result < 0) {

                printk(KERN_WARNING "%s: dvb_dmxdev_init failed (errno = %d)\n",

                       dvb->name, result);

                goto fail_dmxdev;

        }

        dvb->fe_hw.source = DMX_FRONTEND_0;

        result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_hw);

        if (result < 0) {

                printk(KERN_WARNING "%s: add_frontend failed (DMX_FRONTEND_0, errno = %d)\n",

                       dvb->name, result);

                goto fail_fe_hw;

        }

        dvb->fe_mem.source = DMX_MEMORY_FE;

        result = dvb->demux.dmx.add_frontend(&dvb->demux.dmx, &dvb->fe_mem);

        if (result < 0) {

                printk(KERN_WARNING "%s: add_frontend failed (DMX_MEMORY_FE, errno = %d)\n",

                       dvb->name, result);

                goto fail_fe_mem;

        }

        result = dvb->demux.dmx.connect_frontend(&dvb->demux.dmx, &dvb->fe_hw);

        if (result < 0) {

                printk(KERN_WARNING "%s: connect_frontend failed (errno = %d)\n",

                       dvb->name, result);

                goto fail_fe_conn;

        }

        /* register network adapter */

        dvb_net_init(&dvb->adapter, &dvb->net, &dvb->demux.dmx);

        return 0;

fail_fe_conn:

        dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_mem);

fail_fe_mem:

        dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_hw);

fail_fe_hw:

        dvb_dmxdev_release(&dvb->dmxdev);

fail_dmxdev:

        dvb_dmx_release(&dvb->demux);

fail_dmx:

        dvb_unregister_frontend(dvb->frontend);

fail_frontend:

        dvb_frontend_detach(dvb->frontend);

        dvb_unregister_adapter(&dvb->adapter);

fail_adapter:

        return result;

}

void videobuf_dvb_unregister(struct videobuf_dvb *dvb)

{

        dvb_net_release(&dvb->net);

        dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_mem);

        dvb->demux.dmx.remove_frontend(&dvb->demux.dmx, &dvb->fe_hw);

        dvb_dmxdev_release(&dvb->dmxdev);

        dvb_dmx_release(&dvb->demux);

        dvb_unregister_frontend(dvb->frontend);

        dvb_frontend_detach(dvb->frontend);

        dvb_unregister_adapter(&dvb->adapter);

}

EXPORT_SYMBOL(videobuf_dvb_register);

EXPORT_SYMBOL(videobuf_dvb_unregister);

/* ------------------------------------------------------------------ */

/*

 * Local variables:

 * c-basic-offset: 8

 * compile-command: "make DVB=1"

 * End:

 */