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  * To obtain the license, point your browser to
  23  * http://www.gnu.org/copyleft/gpl.html
  24  */
  25
  26 #include <linux/module.h>
  27 #include <linux/init.h>
  28 #include <linux/delay.h>
  29 #include <linux/slab.h>
  30 #include <linux/poll.h>
  31 #include <linux/io.h>
  32 #include <asm/div64.h>
  33 #include <linux/pci.h>
  34 #include <linux/timer.h>
  35 #include <linux/byteorder/generic.h>
  36 #include <linux/firmware.h>
  37 #include <linux/vmalloc.h>
  38
  39 #include "ngene.h"
  40
  41
  42 /****************************************************************************/
  43 /* COMMAND API interface ****************************************************/
  44 /****************************************************************************/
  45
  46 static ssize_t ts_write(struct file *file, const char __user *buf,
  47                         size_t count, loff_t *ppos)
  48 {
  49         struct dvb_device *dvbdev = file->private_data;
  50         struct ngene_channel *chan = dvbdev->priv;
  51         struct ngene *dev = chan->dev;
  52
  53         if (wait_event_interruptible(dev->tsout_rbuf.queue,
  54                                      dvb_ringbuffer_free
  55                                      (&dev->tsout_rbuf) >= count) < 0)
  56                 return 0;
  57
  58         dvb_ringbuffer_write_user(&dev->tsout_rbuf, buf, count);
  59
  60         return count;
  61 }
  62
  63 static ssize_t ts_read(struct file *file, char __user *buf,
  64                        size_t count, loff_t *ppos)
  65 {
  66         struct dvb_device *dvbdev = file->private_data;
  67         struct ngene_channel *chan = dvbdev->priv;
  68         struct ngene *dev = chan->dev;
  69         int left, avail;
  70
  71         left = count;
  72         while (left) {
  73                 if (wait_event_interruptible(
  74                             dev->tsin_rbuf.queue,
  75                             dvb_ringbuffer_avail(&dev->tsin_rbuf) > 0) < 0)
  76                         return -EAGAIN;
  77                 avail = dvb_ringbuffer_avail(&dev->tsin_rbuf);
  78                 if (avail > left)
  79                         avail = left;
  80                 dvb_ringbuffer_read_user(&dev->tsin_rbuf, buf, avail);
  81                 left -= avail;
  82                 buf += avail;
  83         }
  84         return count;
  85 }
  86
  87 static const struct file_operations ci_fops = {
  88         .owner   = THIS_MODULE,
  89         .read    = ts_read,
  90         .write   = ts_write,
  91         .open    = dvb_generic_open,
  92         .release = dvb_generic_release,
  93 };
  94
  95 struct dvb_device ngene_dvbdev_ci = {
  96         .readers = -1,
  97         .writers = -1,
  98         .users   = -1,
  99         .fops    = &ci_fops,
 100 };
 101
 102
 103 /****************************************************************************/
 104 /* DVB functions and API interface ******************************************/
 105 /****************************************************************************/
 106
 107 static void swap_buffer(u32 *p, u32 len)
 108 {
 109         while (len) {
 110                 *p = swab32(*p);
 111                 p++;
 112                 len -= 4;
 113         }
 114 }
 115
 116 /* start of filler packet */
 117 static u8 fill_ts[] = { 0x47, 0x1f, 0xff, 0x10, TS_FILLER };
 118
 119 /* #define DEBUG_CI_XFER */
 120 #ifdef DEBUG_CI_XFER
 121 static u32 ok;
 122 static u32 overflow;
 123 static u32 stripped;
 124 #endif
 125
 126 void *tsin_exchange(void *priv, void *buf, u32 len, u32 clock, u32 flags)
 127 {
 128         struct ngene_channel *chan = priv;
 129         struct ngene *dev = chan->dev;
 130
 131
 132         if (flags & DF_SWAP32)
 133                 swap_buffer(buf, len);
 134
 135         if (dev->ci.en && chan->number == 2) {
 136                 while (len >= 188) {
 137                         if (memcmp(buf, fill_ts, sizeof fill_ts) != 0) {
 138                                 if (dvb_ringbuffer_free(&dev->tsin_rbuf) >= 188) {
 139                                         dvb_ringbuffer_write(&dev->tsin_rbuf, buf, 188);
 140                                         wake_up(&dev->tsin_rbuf.queue);
 141 #ifdef DEBUG_CI_XFER
 142                                         ok++;
 143 #endif
 144                                 }
 145 #ifdef DEBUG_CI_XFER
 146                                 else
 147                                         overflow++;
 148 #endif
 149                         }
 150 #ifdef DEBUG_CI_XFER
 151                         else
 152                                 stripped++;
 153
 154                         if (ok % 100 == 0 && overflow)
 155                                 printk(KERN_WARNING "%s: ok %u overflow %u dropped %u\n", __func__, ok, overflow, stripped);
 156 #endif
 157                         buf += 188;
 158                         len -= 188;
 159                 }
 160                 return NULL;
 161         }
 162
 163         if (chan->users > 0)
 164                 dvb_dmx_swfilter(&chan->demux, buf, len);
 165
 166         return NULL;
 167 }
 168
 169 void *tsout_exchange(void *priv, void *buf, u32 len, u32 clock, u32 flags)
 170 {
 171         struct ngene_channel *chan = priv;
 172         struct ngene *dev = chan->dev;
 173         u32 alen;
 174
 175         alen = dvb_ringbuffer_avail(&dev->tsout_rbuf);
 176         alen -= alen % 188;
 177
 178         if (alen < len)
 179                 FillTSBuffer(buf + alen, len - alen, flags);
 180         else
 181                 alen = len;
 182         dvb_ringbuffer_read(&dev->tsout_rbuf, buf, alen);
 183         if (flags & DF_SWAP32)
 184                 swap_buffer((u32 *)buf, alen);
 185         wake_up_interruptible(&dev->tsout_rbuf.queue);
 186         return buf;
 187 }
 188
 189
 190
 191 int ngene_start_feed(struct dvb_demux_feed *dvbdmxfeed)
 192 {
 193         struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
 194         struct ngene_channel *chan = dvbdmx->priv;
 195
 196         if (chan->users == 0) {
 197                 if (!chan->dev->cmd_timeout_workaround || !chan->running)
 198                         set_transfer(chan, 1);
 199         }
 200
 201         return ++chan->users;
 202 }
 203
 204 int ngene_stop_feed(struct dvb_demux_feed *dvbdmxfeed)
 205 {
 206         struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
 207         struct ngene_channel *chan = dvbdmx->priv;
 208
 209         if (--chan->users)
 210                 return chan->users;
 211
 212         if (!chan->dev->cmd_timeout_workaround)
 213                 set_transfer(chan, 0);
 214
 215         return 0;
 216 }
 217
 218 int my_dvb_dmx_ts_card_init(struct dvb_demux *dvbdemux, char *id,
 219                             int (*start_feed)(struct dvb_demux_feed *),
 220                             int (*stop_feed)(struct dvb_demux_feed *),
 221                             void *priv)
 222 {
 223         dvbdemux->priv = priv;
 224
 225         dvbdemux->filternum = 256;
 226         dvbdemux->feednum = 256;
 227         dvbdemux->start_feed = start_feed;
 228         dvbdemux->stop_feed = stop_feed;
 229         dvbdemux->write_to_decoder = NULL;
 230         dvbdemux->dmx.capabilities = (DMX_TS_FILTERING |
 231                                       DMX_SECTION_FILTERING |
 232                                       DMX_MEMORY_BASED_FILTERING);
 233         return dvb_dmx_init(dvbdemux);
 234 }
 235
 236 int my_dvb_dmxdev_ts_card_init(struct dmxdev *dmxdev,
 237                                struct dvb_demux *dvbdemux,
 238                                struct dmx_frontend *hw_frontend,
 239                                struct dmx_frontend *mem_frontend,
 240                                struct dvb_adapter *dvb_adapter)
 241 {
 242         int ret;
 243
 244         dmxdev->filternum = 256;
 245         dmxdev->demux = &dvbdemux->dmx;
 246         dmxdev->capabilities = 0;
 247         ret = dvb_dmxdev_init(dmxdev, dvb_adapter);
 248         if (ret < 0)
 249                 return ret;
 250
 251         hw_frontend->source = DMX_FRONTEND_0;
 252         dvbdemux->dmx.add_frontend(&dvbdemux->dmx, hw_frontend);
 253         mem_frontend->source = DMX_MEMORY_FE;
 254         dvbdemux->dmx.add_frontend(&dvbdemux->dmx, mem_frontend);
 255         return dvbdemux->dmx.connect_frontend(&dvbdemux->dmx, hw_frontend);
 256 }