cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

firedtv-dvb.c (5709B)


      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      3 * FireDTV driver (formerly known as FireSAT)
      4 *
      5 * Copyright (C) 2004 Andreas Monitzer <andy@monitzer.com>
      6 * Copyright (C) 2008 Henrik Kurelid <henrik@kurelid.se>
      7 */
      8
      9#include <linux/bitops.h>
     10#include <linux/device.h>
     11#include <linux/errno.h>
     12#include <linux/kernel.h>
     13#include <linux/module.h>
     14#include <linux/mutex.h>
     15#include <linux/types.h>
     16
     17#include <media/dmxdev.h>
     18#include <media/dvb_demux.h>
     19#include <media/dvbdev.h>
     20#include <media/dvb_frontend.h>
     21
     22#include "firedtv.h"
     23
     24static int alloc_channel(struct firedtv *fdtv)
     25{
     26	int i;
     27
     28	for (i = 0; i < 16; i++)
     29		if (!__test_and_set_bit(i, &fdtv->channel_active))
     30			break;
     31	return i;
     32}
     33
     34static void collect_channels(struct firedtv *fdtv, int *pidc, u16 pid[])
     35{
     36	int i, n;
     37
     38	for (i = 0, n = 0; i < 16; i++)
     39		if (test_bit(i, &fdtv->channel_active))
     40			pid[n++] = fdtv->channel_pid[i];
     41	*pidc = n;
     42}
     43
     44static inline void dealloc_channel(struct firedtv *fdtv, int i)
     45{
     46	__clear_bit(i, &fdtv->channel_active);
     47}
     48
     49int fdtv_start_feed(struct dvb_demux_feed *dvbdmxfeed)
     50{
     51	struct firedtv *fdtv = dvbdmxfeed->demux->priv;
     52	int pidc, c, ret;
     53	u16 pids[16];
     54
     55	switch (dvbdmxfeed->type) {
     56	case DMX_TYPE_TS:
     57	case DMX_TYPE_SEC:
     58		break;
     59	default:
     60		dev_err(fdtv->device, "can't start dmx feed: invalid type %u\n",
     61			dvbdmxfeed->type);
     62		return -EINVAL;
     63	}
     64
     65	if (mutex_lock_interruptible(&fdtv->demux_mutex))
     66		return -EINTR;
     67
     68	if (dvbdmxfeed->type == DMX_TYPE_TS) {
     69		switch (dvbdmxfeed->pes_type) {
     70		case DMX_PES_VIDEO:
     71		case DMX_PES_AUDIO:
     72		case DMX_PES_TELETEXT:
     73		case DMX_PES_PCR:
     74		case DMX_PES_OTHER:
     75			c = alloc_channel(fdtv);
     76			break;
     77		default:
     78			dev_err(fdtv->device,
     79				"can't start dmx feed: invalid pes type %u\n",
     80				dvbdmxfeed->pes_type);
     81			ret = -EINVAL;
     82			goto out;
     83		}
     84	} else {
     85		c = alloc_channel(fdtv);
     86	}
     87
     88	if (c > 15) {
     89		dev_err(fdtv->device, "can't start dmx feed: busy\n");
     90		ret = -EBUSY;
     91		goto out;
     92	}
     93
     94	dvbdmxfeed->priv = (typeof(dvbdmxfeed->priv))(unsigned long)c;
     95	fdtv->channel_pid[c] = dvbdmxfeed->pid;
     96	collect_channels(fdtv, &pidc, pids);
     97
     98	if (dvbdmxfeed->pid == 8192) {
     99		ret = avc_tuner_get_ts(fdtv);
    100		if (ret) {
    101			dealloc_channel(fdtv, c);
    102			dev_err(fdtv->device, "can't get TS\n");
    103			goto out;
    104		}
    105	} else {
    106		ret = avc_tuner_set_pids(fdtv, pidc, pids);
    107		if (ret) {
    108			dealloc_channel(fdtv, c);
    109			dev_err(fdtv->device, "can't set PIDs\n");
    110			goto out;
    111		}
    112	}
    113out:
    114	mutex_unlock(&fdtv->demux_mutex);
    115
    116	return ret;
    117}
    118
    119int fdtv_stop_feed(struct dvb_demux_feed *dvbdmxfeed)
    120{
    121	struct dvb_demux *demux = dvbdmxfeed->demux;
    122	struct firedtv *fdtv = demux->priv;
    123	int pidc, c, ret;
    124	u16 pids[16];
    125
    126	if (dvbdmxfeed->type == DMX_TYPE_TS &&
    127	    !((dvbdmxfeed->ts_type & TS_PACKET) &&
    128	      (demux->dmx.frontend->source != DMX_MEMORY_FE))) {
    129
    130		if (dvbdmxfeed->ts_type & TS_DECODER) {
    131			if (dvbdmxfeed->pes_type >= DMX_PES_OTHER ||
    132			    !demux->pesfilter[dvbdmxfeed->pes_type])
    133				return -EINVAL;
    134
    135			demux->pids[dvbdmxfeed->pes_type] |= 0x8000;
    136			demux->pesfilter[dvbdmxfeed->pes_type] = NULL;
    137		}
    138
    139		if (!(dvbdmxfeed->ts_type & TS_DECODER &&
    140		      dvbdmxfeed->pes_type < DMX_PES_OTHER))
    141			return 0;
    142	}
    143
    144	if (mutex_lock_interruptible(&fdtv->demux_mutex))
    145		return -EINTR;
    146
    147	c = (unsigned long)dvbdmxfeed->priv;
    148	dealloc_channel(fdtv, c);
    149	collect_channels(fdtv, &pidc, pids);
    150
    151	ret = avc_tuner_set_pids(fdtv, pidc, pids);
    152
    153	mutex_unlock(&fdtv->demux_mutex);
    154
    155	return ret;
    156}
    157
    158DVB_DEFINE_MOD_OPT_ADAPTER_NR(adapter_nr);
    159
    160int fdtv_dvb_register(struct firedtv *fdtv, const char *name)
    161{
    162	int err;
    163
    164	err = dvb_register_adapter(&fdtv->adapter, name,
    165				   THIS_MODULE, fdtv->device, adapter_nr);
    166	if (err < 0)
    167		goto fail_log;
    168
    169	/*DMX_TS_FILTERING | DMX_SECTION_FILTERING*/
    170	fdtv->demux.dmx.capabilities = 0;
    171
    172	fdtv->demux.priv	= fdtv;
    173	fdtv->demux.filternum	= 16;
    174	fdtv->demux.feednum	= 16;
    175	fdtv->demux.start_feed	= fdtv_start_feed;
    176	fdtv->demux.stop_feed	= fdtv_stop_feed;
    177	fdtv->demux.write_to_decoder = NULL;
    178
    179	err = dvb_dmx_init(&fdtv->demux);
    180	if (err)
    181		goto fail_unreg_adapter;
    182
    183	fdtv->dmxdev.filternum    = 16;
    184	fdtv->dmxdev.demux        = &fdtv->demux.dmx;
    185	fdtv->dmxdev.capabilities = 0;
    186
    187	err = dvb_dmxdev_init(&fdtv->dmxdev, &fdtv->adapter);
    188	if (err)
    189		goto fail_dmx_release;
    190
    191	fdtv->frontend.source = DMX_FRONTEND_0;
    192
    193	err = fdtv->demux.dmx.add_frontend(&fdtv->demux.dmx, &fdtv->frontend);
    194	if (err)
    195		goto fail_dmxdev_release;
    196
    197	err = fdtv->demux.dmx.connect_frontend(&fdtv->demux.dmx,
    198					       &fdtv->frontend);
    199	if (err)
    200		goto fail_rem_frontend;
    201
    202	err = dvb_net_init(&fdtv->adapter, &fdtv->dvbnet, &fdtv->demux.dmx);
    203	if (err)
    204		goto fail_disconnect_frontend;
    205
    206	fdtv_frontend_init(fdtv, name);
    207	err = dvb_register_frontend(&fdtv->adapter, &fdtv->fe);
    208	if (err)
    209		goto fail_net_release;
    210
    211	err = fdtv_ca_register(fdtv);
    212	if (err)
    213		dev_info(fdtv->device,
    214			 "Conditional Access Module not enabled\n");
    215	return 0;
    216
    217fail_net_release:
    218	dvb_net_release(&fdtv->dvbnet);
    219fail_disconnect_frontend:
    220	fdtv->demux.dmx.close(&fdtv->demux.dmx);
    221fail_rem_frontend:
    222	fdtv->demux.dmx.remove_frontend(&fdtv->demux.dmx, &fdtv->frontend);
    223fail_dmxdev_release:
    224	dvb_dmxdev_release(&fdtv->dmxdev);
    225fail_dmx_release:
    226	dvb_dmx_release(&fdtv->demux);
    227fail_unreg_adapter:
    228	dvb_unregister_adapter(&fdtv->adapter);
    229fail_log:
    230	dev_err(fdtv->device, "DVB initialization failed\n");
    231	return err;
    232}
    233
    234void fdtv_dvb_unregister(struct firedtv *fdtv)
    235{
    236	fdtv_ca_release(fdtv);
    237	dvb_unregister_frontend(&fdtv->fe);
    238	dvb_net_release(&fdtv->dvbnet);
    239	fdtv->demux.dmx.close(&fdtv->demux.dmx);
    240	fdtv->demux.dmx.remove_frontend(&fdtv->demux.dmx, &fdtv->frontend);
    241	dvb_dmxdev_release(&fdtv->dmxdev);
    242	dvb_dmx_release(&fdtv->demux);
    243	dvb_unregister_adapter(&fdtv->adapter);
    244}