drivers/media/video/pvrusb2/pvrusb2-context.c

   1 /*
   2  *  $Id$
   3  *
   4  *  Copyright (C) 2005 Mike Isely <isely@pobox.com>
   5  *
   6  *  This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation; either version 2 of the License
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software
  17  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18  *
  19  */
  20
  21 #include "pvrusb2-context.h"
  22 #include "pvrusb2-io.h"
  23 #include "pvrusb2-ioread.h"
  24 #include "pvrusb2-hdw.h"
  25 #include "pvrusb2-debug.h"
  26 #include <linux/errno.h>
  27 #include <linux/string.h>
  28 #include <linux/slab.h>
  29 #include <asm/semaphore.h>
  30
  31
  32 static void pvr2_context_destroy(struct pvr2_context *mp)
  33 {
  34         if (mp->hdw) pvr2_hdw_destroy(mp->hdw);
  35         pvr2_trace(PVR2_TRACE_STRUCT,"Destroying pvr_main id=%p",mp);
  36         flush_workqueue(mp->workqueue);
  37         destroy_workqueue(mp->workqueue);
  38         kfree(mp);
  39 }
  40
  41
  42 static void pvr2_context_trigger_poll(struct pvr2_context *mp)
  43 {
  44         queue_work(mp->workqueue,&mp->workpoll);
  45 }
  46
  47
  48 static void pvr2_context_poll(struct pvr2_context *mp)
  49 {
  50         pvr2_context_enter(mp); do {
  51                 pvr2_hdw_poll(mp->hdw);
  52         } while (0); pvr2_context_exit(mp);
  53 }
  54
  55
  56 static void pvr2_context_setup(struct pvr2_context *mp)
  57 {
  58         pvr2_context_enter(mp); do {
  59                 if (!pvr2_hdw_dev_ok(mp->hdw)) break;
  60                 pvr2_hdw_setup(mp->hdw);
  61                 pvr2_hdw_setup_poll_trigger(
  62                         mp->hdw,
  63                         (void (*)(void *))pvr2_context_trigger_poll,
  64                         mp);
  65                 if (!pvr2_hdw_dev_ok(mp->hdw)) break;
  66                 if (!pvr2_hdw_init_ok(mp->hdw)) break;
  67                 mp->video_stream.stream = pvr2_hdw_get_video_stream(mp->hdw);
  68                 if (mp->setup_func) {
  69                         mp->setup_func(mp);
  70                 }
  71         } while (0); pvr2_context_exit(mp);
  72 }
  73
  74
  75 struct pvr2_context *pvr2_context_create(
  76         struct usb_interface *intf,
  77         const struct usb_device_id *devid,
  78         void (*setup_func)(struct pvr2_context *))
  79 {
  80         struct pvr2_context *mp = NULL;
  81         mp = kmalloc(sizeof(*mp),GFP_KERNEL);
  82         if (!mp) goto done;
  83         memset(mp,0,sizeof(*mp));
  84         pvr2_trace(PVR2_TRACE_STRUCT,"Creating pvr_main id=%p",mp);
  85         mp->setup_func = setup_func;
  86         mutex_init(&mp->mutex);
  87         mp->hdw = pvr2_hdw_create(intf,devid);
  88         if (!mp->hdw) {
  89                 pvr2_context_destroy(mp);
  90                 mp = NULL;
  91                 goto done;
  92         }
  93
  94         mp->workqueue = create_singlethread_workqueue("pvrusb2");
  95         INIT_WORK(&mp->workinit,(void (*)(void*))pvr2_context_setup,mp);
  96         INIT_WORK(&mp->workpoll,(void (*)(void*))pvr2_context_poll,mp);
  97         queue_work(mp->workqueue,&mp->workinit);
  98  done:
  99         return mp;
 100 }
 101
 102
 103 void pvr2_context_enter(struct pvr2_context *mp)
 104 {
 105         mutex_lock(&mp->mutex);
 106         pvr2_trace(PVR2_TRACE_CREG,"pvr2_context_enter(id=%p)",mp);
 107 }
 108
 109
 110 void pvr2_context_exit(struct pvr2_context *mp)
 111 {
 112         int destroy_flag = 0;
 113         if (!(mp->mc_first || !mp->disconnect_flag)) {
 114                 destroy_flag = !0;
 115         }
 116         pvr2_trace(PVR2_TRACE_CREG,"pvr2_context_exit(id=%p) outside",mp);
 117         mutex_unlock(&mp->mutex);
 118         if (destroy_flag) pvr2_context_destroy(mp);
 119 }
 120
 121
 122 static void pvr2_context_run_checks(struct pvr2_context *mp)
 123 {
 124         struct pvr2_channel *ch1,*ch2;
 125         for (ch1 = mp->mc_first; ch1; ch1 = ch2) {
 126                 ch2 = ch1->mc_next;
 127                 if (ch1->check_func) {
 128                         ch1->check_func(ch1);
 129                 }
 130         }
 131 }
 132
 133
 134 void pvr2_context_disconnect(struct pvr2_context *mp)
 135 {
 136         pvr2_context_enter(mp); do {
 137                 pvr2_hdw_disconnect(mp->hdw);
 138                 mp->disconnect_flag = !0;
 139                 pvr2_context_run_checks(mp);
 140         } while (0); pvr2_context_exit(mp);
 141 }
 142
 143
 144 void pvr2_channel_init(struct pvr2_channel *cp,struct pvr2_context *mp)
 145 {
 146         cp->hdw = mp->hdw;
 147         cp->mc_head = mp;
 148         cp->mc_next = NULL;
 149         cp->mc_prev = mp->mc_last;
 150         if (mp->mc_last) {
 151                 mp->mc_last->mc_next = cp;
 152         } else {
 153                 mp->mc_first = cp;
 154         }
 155         mp->mc_last = cp;
 156 }
 157
 158
 159 static void pvr2_channel_disclaim_stream(struct pvr2_channel *cp)
 160 {
 161         if (!cp->stream) return;
 162         pvr2_stream_kill(cp->stream->stream);
 163         cp->stream->user = NULL;
 164         cp->stream = NULL;
 165 }
 166
 167
 168 void pvr2_channel_done(struct pvr2_channel *cp)
 169 {
 170         struct pvr2_context *mp = cp->mc_head;
 171         pvr2_channel_disclaim_stream(cp);
 172         if (cp->mc_next) {
 173                 cp->mc_next->mc_prev = cp->mc_prev;
 174         } else {
 175                 mp->mc_last = cp->mc_prev;
 176         }
 177         if (cp->mc_prev) {
 178                 cp->mc_prev->mc_next = cp->mc_next;
 179         } else {
 180                 mp->mc_first = cp->mc_next;
 181         }
 182         cp->hdw = NULL;
 183 }
 184
 185
 186 int pvr2_channel_claim_stream(struct pvr2_channel *cp,
 187                               struct pvr2_context_stream *sp)
 188 {
 189         int code = 0;
 190         pvr2_context_enter(cp->mc_head); do {
 191                 if (sp == cp->stream) break;
 192                 if (sp->user) {
 193                         code = -EBUSY;
 194                         break;
 195                 }
 196                 pvr2_channel_disclaim_stream(cp);
 197                 if (!sp) break;
 198                 sp->user = cp;
 199                 cp->stream = sp;
 200         } while (0); pvr2_context_exit(cp->mc_head);
 201         return code;
 202 }
 203
 204
 205 // This is the marker for the real beginning of a legitimate mpeg2 stream.
 206 static char stream_sync_key[] = {
 207         0x00, 0x00, 0x01, 0xba,
 208 };
 209
 210 struct pvr2_ioread *pvr2_channel_create_mpeg_stream(
 211         struct pvr2_context_stream *sp)
 212 {
 213         struct pvr2_ioread *cp;
 214         cp = pvr2_ioread_create();
 215         if (!cp) return NULL;
 216         pvr2_ioread_setup(cp,sp->stream);
 217         pvr2_ioread_set_sync_key(cp,stream_sync_key,sizeof(stream_sync_key));
 218         return cp;
 219 }
 220
 221
 222 /*
 223   Stuff for Emacs to see, in order to encourage consistent editing style:
 224   *** Local Variables: ***
 225   *** mode: c ***
 226   *** fill-column: 75 ***
 227   *** tab-width: 8 ***
 228   *** c-basic-offset: 8 ***
 229   *** End: ***
 230   */