drivers/media/pci/ngene/ngene-dvb.c

   1 /*
   2  * ngene-dvb.c: nGene PCIe bridge driver - DVB functions
   3  *
   4  * Copyright (C) 2005-2007 Micronas
   5  *
   6  * Copyright (C) 2008-2009 Ralph Metzler <rjkm@metzlerbros.de>
   7  *                         Modifications for new nGene firmware,
   8  *                         support for EEPROM-copying,
   9  *                         support for new dual DVB-S2 card prototype
  10  *
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License
  14  * version 2 only, as published by the Free Software Foundation.
  15  *
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  *
  23  * You should have received a copy of the GNU General Public License
  24  * along with this program; if not, write to the Free Software
  25  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  26  * 02110-1301, USA
  27  * Or, point your browser to http://www.gnu.org/copyleft/gpl.html
  28  */
  29
  30 #include <linux/module.h>
  31 #include <linux/init.h>
  32 #include <linux/delay.h>
  33 #include <linux/slab.h>
  34 #include <linux/poll.h>
  35 #include <linux/io.h>
  36 #include <asm/div64.h>
  37 #include <linux/pci.h>
  38 #include <linux/timer.h>
  39 #include <linux/byteorder/generic.h>
  40 #include <linux/firmware.h>
  41 #include <linux/vmalloc.h>
  42
  43 #include "ngene.h"
  44
  45
  46 /****************************************************************************/
  47 /* COMMAND API interface ****************************************************/
  48 /****************************************************************************/
  49
  50 static ssize_t ts_write(struct file *file, const char *buf,
  51                         size_t count, loff_t *ppos)
  52 {
  53         struct dvb_device *dvbdev = file->private_data;
  54         struct ngene_channel *chan = dvbdev->priv;
  55         struct ngene *dev = chan->dev;
  56
  57         if (wait_event_interruptible(dev->tsout_rbuf.queue,
  58                                      dvb_ringbuffer_free
  59                                      (&dev->tsout_rbuf) >= count) < 0)
  60                 return 0;
  61
  62         dvb_ringbuffer_write(&dev->tsout_rbuf, buf, count);
  63
  64         return count;
  65 }
  66
  67 static ssize_t ts_read(struct file *file, char *buf,
  68                        size_t count, loff_t *ppos)
  69 {
  70         struct dvb_device *dvbdev = file->private_data;
  71         struct ngene_channel *chan = dvbdev->priv;
  72         struct ngene *dev = chan->dev;
  73         int left, avail;
  74
  75         left = count;
  76         while (left) {
  77                 if (wait_event_interruptible(
  78                             dev->tsin_rbuf.queue,
  79                             dvb_ringbuffer_avail(&dev->tsin_rbuf) > 0) < 0)
  80                         return -EAGAIN;
  81                 avail = dvb_ringbuffer_avail(&dev->tsin_rbuf);
  82                 if (avail > left)
  83                         avail = left;
  84                 dvb_ringbuffer_read_user(&dev->tsin_rbuf, buf, avail);
  85                 left -= avail;
  86                 buf += avail;
  87         }
  88         return count;
  89 }
  90
  91 static const struct file_operations ci_fops = {
  92         .owner   = THIS_MODULE,
  93         .read    = ts_read,
  94         .write   = ts_write,
  95         .open    = dvb_generic_open,
  96         .release = dvb_generic_release,
  97 };
  98
  99 struct dvb_device ngene_dvbdev_ci = {
 100         .priv    = 0,
 101         .readers = -1,
 102         .writers = -1,
 103         .users   = -1,
 104         .fops    = &ci_fops,
 105 };
 106
 107
 108 /****************************************************************************/
 109 /* DVB functions and API interface ******************************************/
 110 /****************************************************************************/
 111
 112 static void swap_buffer(u32 *p, u32 len)
 113 {
 114         while (len) {
 115                 *p = swab32(*p);
 116                 p++;
 117                 len -= 4;
 118         }
 119 }
 120
 121 /* start of filler packet */
 122 static u8 fill_ts[] = { 0x47, 0x1f, 0xff, 0x10, TS_FILLER };
 123
 124 /* #define DEBUG_CI_XFER */
 125 #ifdef DEBUG_CI_XFER
 126 static u32 ok;
 127 static u32 overflow;
 128 static u32 stripped;
 129 #endif
 130
 131 void *tsin_exchange(void *priv, void *buf, u32 len, u32 clock, u32 flags)
 132 {
 133         struct ngene_channel *chan = priv;
 134         struct ngene *dev = chan->dev;
 135
 136
 137         if (flags & DF_SWAP32)
 138                 swap_buffer(buf, len);
 139
 140         if (dev->ci.en && chan->number == 2) {
 141                 while (len >= 188) {
 142                         if (memcmp(buf, fill_ts, sizeof fill_ts) != 0) {
 143                                 if (dvb_ringbuffer_free(&dev->tsin_rbuf) >= 188) {
 144                                         dvb_ringbuffer_write(&dev->tsin_rbuf, buf, 188);
 145                                         wake_up(&dev->tsin_rbuf.queue);
 146 #ifdef DEBUG_CI_XFER
 147                                         ok++;
 148 #endif
 149                                 }
 150 #ifdef DEBUG_CI_XFER
 151                                 else
 152                                         overflow++;
 153 #endif
 154                         }
 155 #ifdef DEBUG_CI_XFER
 156                         else
 157                                 stripped++;
 158
 159                         if (ok % 100 == 0 && overflow)
 160                                 printk(KERN_WARNING "%s: ok %u overflow %u dropped %u\n", __func__, ok, overflow, stripped);
 161 #endif
 162                         buf += 188;
 163                         len -= 188;
 164                 }
 165                 return NULL;
 166         }
 167
 168         if (chan->users > 0)
 169                 dvb_dmx_swfilter(&chan->demux, buf, len);
 170
 171         return NULL;
 172 }
 173
 174 void *tsout_exchange(void *priv, void *buf, u32 len, u32 clock, u32 flags)
 175 {
 176         struct ngene_channel *chan = priv;
 177         struct ngene *dev = chan->dev;
 178         u32 alen;
 179
 180         alen = dvb_ringbuffer_avail(&dev->tsout_rbuf);
 181         alen -= alen % 188;
 182
 183         if (alen < len)
 184                 FillTSBuffer(buf + alen, len - alen, flags);
 185         else
 186                 alen = len;
 187         dvb_ringbuffer_read(&dev->tsout_rbuf, buf, alen);
 188         if (flags & DF_SWAP32)
 189                 swap_buffer((u32 *)buf, alen);
 190         wake_up_interruptible(&dev->tsout_rbuf.queue);
 191         return buf;
 192 }
 193
 194
 195
 196 int ngene_start_feed(struct dvb_demux_feed *dvbdmxfeed)
 197 {
 198         struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
 199         struct ngene_channel *chan = dvbdmx->priv;
 200
 201         if (chan->users == 0) {
 202                 if (!chan->dev->cmd_timeout_workaround || !chan->running)
 203                         set_transfer(chan, 1);
 204         }
 205
 206         return ++chan->users;
 207 }
 208
 209 int ngene_stop_feed(struct dvb_demux_feed *dvbdmxfeed)
 210 {
 211         struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
 212         struct ngene_channel *chan = dvbdmx->priv;
 213
 214         if (--chan->users)
 215                 return chan->users;
 216
 217         if (!chan->dev->cmd_timeout_workaround)
 218                 set_transfer(chan, 0);
 219
 220         return 0;
 221 }
 222
 223 int my_dvb_dmx_ts_card_init(struct dvb_demux *dvbdemux, char *id,
 224                             int (*start_feed)(struct dvb_demux_feed *),
 225                             int (*stop_feed)(struct dvb_demux_feed *),
 226                             void *priv)
 227 {
 228         dvbdemux->priv = priv;
 229
 230         dvbdemux->filternum = 256;
 231         dvbdemux->feednum = 256;
 232         dvbdemux->start_feed = start_feed;
 233         dvbdemux->stop_feed = stop_feed;
 234         dvbdemux->write_to_decoder = NULL;
 235         dvbdemux->dmx.capabilities = (DMX_TS_FILTERING |
 236                                       DMX_SECTION_FILTERING |
 237                                       DMX_MEMORY_BASED_FILTERING);
 238         return dvb_dmx_init(dvbdemux);
 239 }
 240
 241 int my_dvb_dmxdev_ts_card_init(struct dmxdev *dmxdev,
 242                                struct dvb_demux *dvbdemux,
 243                                struct dmx_frontend *hw_frontend,
 244                                struct dmx_frontend *mem_frontend,
 245                                struct dvb_adapter *dvb_adapter)
 246 {
 247         int ret;
 248
 249         dmxdev->filternum = 256;
 250         dmxdev->demux = &dvbdemux->dmx;
 251         dmxdev->capabilities = 0;
 252         ret = dvb_dmxdev_init(dmxdev, dvb_adapter);
 253         if (ret < 0)
 254                 return ret;
 255
 256         hw_frontend->source = DMX_FRONTEND_0;
 257         dvbdemux->dmx.add_frontend(&dvbdemux->dmx, hw_frontend);
 258         mem_frontend->source = DMX_MEMORY_FE;
 259         dvbdemux->dmx.add_frontend(&dvbdemux->dmx, mem_frontend);
 260         return dvbdemux->dmx.connect_frontend(&dvbdemux->dmx, hw_frontend);
 261 }