kernel/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 __user *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_user(&dev->tsout_rbuf, buf, count);
  63
  64         return count;
  65 }
  66
  67 static ssize_t ts_read(struct file *file, char __user *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         .readers = -1,
 101         .writers = -1,
 102         .users   = -1,
 103         .fops    = &ci_fops,
 104 };
 105
 106
 107 /****************************************************************************/
 108 /* DVB functions and API interface ******************************************/
 109 /****************************************************************************/
 110
 111 static void swap_buffer(u32 *p, u32 len)
 112 {
 113         while (len) {
 114                 *p = swab32(*p);
 115                 p++;
 116                 len -= 4;
 117         }
 118 }
 119
 120 /* start of filler packet */
 121 static u8 fill_ts[] = { 0x47, 0x1f, 0xff, 0x10, TS_FILLER };
 122
 123 /* #define DEBUG_CI_XFER */
 124 #ifdef DEBUG_CI_XFER
 125 static u32 ok;
 126 static u32 overflow;
 127 static u32 stripped;
 128 #endif
 129
 130 void *tsin_exchange(void *priv, void *buf, u32 len, u32 clock, u32 flags)
 131 {
 132         struct ngene_channel *chan = priv;
 133         struct ngene *dev = chan->dev;
 134
 135
 136         if (flags & DF_SWAP32)
 137                 swap_buffer(buf, len);
 138
 139         if (dev->ci.en && chan->number == 2) {
 140                 while (len >= 188) {
 141                         if (memcmp(buf, fill_ts, sizeof fill_ts) != 0) {
 142                                 if (dvb_ringbuffer_free(&dev->tsin_rbuf) >= 188) {
 143                                         dvb_ringbuffer_write(&dev->tsin_rbuf, buf, 188);
 144                                         wake_up(&dev->tsin_rbuf.queue);
 145 #ifdef DEBUG_CI_XFER
 146                                         ok++;
 147 #endif
 148                                 }
 149 #ifdef DEBUG_CI_XFER
 150                                 else
 151                                         overflow++;
 152 #endif
 153                         }
 154 #ifdef DEBUG_CI_XFER
 155                         else
 156                                 stripped++;
 157
 158                         if (ok % 100 == 0 && overflow)
 159                                 printk(KERN_WARNING "%s: ok %u overflow %u dropped %u\n", __func__, ok, overflow, stripped);
 160 #endif
 161                         buf += 188;
 162                         len -= 188;
 163                 }
 164                 return NULL;
 165         }
 166
 167         if (chan->users > 0)
 168                 dvb_dmx_swfilter(&chan->demux, buf, len);
 169
 170         return NULL;
 171 }
 172
 173 void *tsout_exchange(void *priv, void *buf, u32 len, u32 clock, u32 flags)
 174 {
 175         struct ngene_channel *chan = priv;
 176         struct ngene *dev = chan->dev;
 177         u32 alen;
 178
 179         alen = dvb_ringbuffer_avail(&dev->tsout_rbuf);
 180         alen -= alen % 188;
 181
 182         if (alen < len)
 183                 FillTSBuffer(buf + alen, len - alen, flags);
 184         else
 185                 alen = len;
 186         dvb_ringbuffer_read(&dev->tsout_rbuf, buf, alen);
 187         if (flags & DF_SWAP32)
 188                 swap_buffer((u32 *)buf, alen);
 189         wake_up_interruptible(&dev->tsout_rbuf.queue);
 190         return buf;
 191 }
 192
 193
 194
 195 int ngene_start_feed(struct dvb_demux_feed *dvbdmxfeed)
 196 {
 197         struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
 198         struct ngene_channel *chan = dvbdmx->priv;
 199
 200         if (chan->users == 0) {
 201                 if (!chan->dev->cmd_timeout_workaround || !chan->running)
 202                         set_transfer(chan, 1);
 203         }
 204
 205         return ++chan->users;
 206 }
 207
 208 int ngene_stop_feed(struct dvb_demux_feed *dvbdmxfeed)
 209 {
 210         struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
 211         struct ngene_channel *chan = dvbdmx->priv;
 212
 213         if (--chan->users)
 214                 return chan->users;
 215
 216         if (!chan->dev->cmd_timeout_workaround)
 217                 set_transfer(chan, 0);
 218
 219         return 0;
 220 }
 221
 222 int my_dvb_dmx_ts_card_init(struct dvb_demux *dvbdemux, char *id,
 223                             int (*start_feed)(struct dvb_demux_feed *),
 224                             int (*stop_feed)(struct dvb_demux_feed *),
 225                             void *priv)
 226 {
 227         dvbdemux->priv = priv;
 228
 229         dvbdemux->filternum = 256;
 230         dvbdemux->feednum = 256;
 231         dvbdemux->start_feed = start_feed;
 232         dvbdemux->stop_feed = stop_feed;
 233         dvbdemux->write_to_decoder = NULL;
 234         dvbdemux->dmx.capabilities = (DMX_TS_FILTERING |
 235                                       DMX_SECTION_FILTERING |
 236                                       DMX_MEMORY_BASED_FILTERING);
 237         return dvb_dmx_init(dvbdemux);
 238 }
 239
 240 int my_dvb_dmxdev_ts_card_init(struct dmxdev *dmxdev,
 241                                struct dvb_demux *dvbdemux,
 242                                struct dmx_frontend *hw_frontend,
 243                                struct dmx_frontend *mem_frontend,
 244                                struct dvb_adapter *dvb_adapter)
 245 {
 246         int ret;
 247
 248         dmxdev->filternum = 256;
 249         dmxdev->demux = &dvbdemux->dmx;
 250         dmxdev->capabilities = 0;
 251         ret = dvb_dmxdev_init(dmxdev, dvb_adapter);
 252         if (ret < 0)
 253                 return ret;
 254
 255         hw_frontend->source = DMX_FRONTEND_0;
 256         dvbdemux->dmx.add_frontend(&dvbdemux->dmx, hw_frontend);
 257         mem_frontend->source = DMX_MEMORY_FE;
 258         dvbdemux->dmx.add_frontend(&dvbdemux->dmx, mem_frontend);
 259         return dvbdemux->dmx.connect_frontend(&dvbdemux->dmx, hw_frontend);
 260 }