Mike Isely | d855497 | 2006-06-26 20:58:46 -0300 | [diff] [blame] | 1 | /* |
Mike Isely | d855497 | 2006-06-26 20:58:46 -0300 | [diff] [blame] | 2 | * |
| 3 | * Copyright (C) 2005 Mike Isely <isely@pobox.com> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation; either version 2 of the License |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write to the Free Software |
| 16 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 17 | * |
| 18 | */ |
| 19 | |
| 20 | #include "pvrusb2-context.h" |
| 21 | #include "pvrusb2-io.h" |
| 22 | #include "pvrusb2-ioread.h" |
| 23 | #include "pvrusb2-hdw.h" |
| 24 | #include "pvrusb2-debug.h" |
Mike Isely | e5be15c | 2008-04-07 02:22:04 -0300 | [diff] [blame] | 25 | #include <linux/wait.h> |
Mike Isely | 794b160 | 2008-04-22 14:45:45 -0300 | [diff] [blame] | 26 | #include <linux/kthread.h> |
Mike Isely | d855497 | 2006-06-26 20:58:46 -0300 | [diff] [blame] | 27 | #include <linux/errno.h> |
| 28 | #include <linux/string.h> |
| 29 | #include <linux/slab.h> |
Mike Isely | d855497 | 2006-06-26 20:58:46 -0300 | [diff] [blame] | 30 | |
Mike Isely | e5be15c | 2008-04-07 02:22:04 -0300 | [diff] [blame] | 31 | static struct pvr2_context *pvr2_context_exist_first; |
| 32 | static struct pvr2_context *pvr2_context_exist_last; |
| 33 | static struct pvr2_context *pvr2_context_notify_first; |
| 34 | static struct pvr2_context *pvr2_context_notify_last; |
| 35 | static DEFINE_MUTEX(pvr2_context_mutex); |
| 36 | static DECLARE_WAIT_QUEUE_HEAD(pvr2_context_sync_data); |
Mike Isely | 18ecbb4 | 2008-04-09 05:14:11 -0300 | [diff] [blame] | 37 | static DECLARE_WAIT_QUEUE_HEAD(pvr2_context_cleanup_data); |
| 38 | static int pvr2_context_cleanup_flag; |
| 39 | static int pvr2_context_cleaned_flag; |
Mike Isely | e5be15c | 2008-04-07 02:22:04 -0300 | [diff] [blame] | 40 | static struct task_struct *pvr2_context_thread_ptr; |
| 41 | |
| 42 | |
| 43 | static void pvr2_context_set_notify(struct pvr2_context *mp, int fl) |
| 44 | { |
| 45 | int signal_flag = 0; |
| 46 | mutex_lock(&pvr2_context_mutex); |
| 47 | if (fl) { |
| 48 | if (!mp->notify_flag) { |
| 49 | signal_flag = (pvr2_context_notify_first == NULL); |
| 50 | mp->notify_prev = pvr2_context_notify_last; |
| 51 | mp->notify_next = NULL; |
| 52 | pvr2_context_notify_last = mp; |
| 53 | if (mp->notify_prev) { |
| 54 | mp->notify_prev->notify_next = mp; |
| 55 | } else { |
| 56 | pvr2_context_notify_first = mp; |
| 57 | } |
| 58 | mp->notify_flag = !0; |
| 59 | } |
| 60 | } else { |
| 61 | if (mp->notify_flag) { |
| 62 | mp->notify_flag = 0; |
| 63 | if (mp->notify_next) { |
| 64 | mp->notify_next->notify_prev = mp->notify_prev; |
| 65 | } else { |
| 66 | pvr2_context_notify_last = mp->notify_prev; |
| 67 | } |
| 68 | if (mp->notify_prev) { |
| 69 | mp->notify_prev->notify_next = mp->notify_next; |
| 70 | } else { |
| 71 | pvr2_context_notify_first = mp->notify_next; |
| 72 | } |
| 73 | } |
| 74 | } |
| 75 | mutex_unlock(&pvr2_context_mutex); |
| 76 | if (signal_flag) wake_up(&pvr2_context_sync_data); |
| 77 | } |
| 78 | |
Mike Isely | d855497 | 2006-06-26 20:58:46 -0300 | [diff] [blame] | 79 | |
| 80 | static void pvr2_context_destroy(struct pvr2_context *mp) |
| 81 | { |
Mike Isely | 794b160 | 2008-04-22 14:45:45 -0300 | [diff] [blame] | 82 | pvr2_trace(PVR2_TRACE_CTXT,"pvr2_context %p (destroy)",mp); |
Mike Isely | 681c739 | 2007-11-26 01:48:52 -0300 | [diff] [blame] | 83 | if (mp->hdw) pvr2_hdw_destroy(mp->hdw); |
Mike Isely | e5be15c | 2008-04-07 02:22:04 -0300 | [diff] [blame] | 84 | pvr2_context_set_notify(mp, 0); |
| 85 | mutex_lock(&pvr2_context_mutex); |
| 86 | if (mp->exist_next) { |
| 87 | mp->exist_next->exist_prev = mp->exist_prev; |
| 88 | } else { |
| 89 | pvr2_context_exist_last = mp->exist_prev; |
| 90 | } |
| 91 | if (mp->exist_prev) { |
| 92 | mp->exist_prev->exist_next = mp->exist_next; |
| 93 | } else { |
| 94 | pvr2_context_exist_first = mp->exist_next; |
| 95 | } |
| 96 | if (!pvr2_context_exist_first) { |
| 97 | /* Trigger wakeup on control thread in case it is waiting |
| 98 | for an exit condition. */ |
| 99 | wake_up(&pvr2_context_sync_data); |
| 100 | } |
| 101 | mutex_unlock(&pvr2_context_mutex); |
Mike Isely | d855497 | 2006-06-26 20:58:46 -0300 | [diff] [blame] | 102 | kfree(mp); |
| 103 | } |
| 104 | |
| 105 | |
Mike Isely | 794b160 | 2008-04-22 14:45:45 -0300 | [diff] [blame] | 106 | static void pvr2_context_notify(struct pvr2_context *mp) |
Mike Isely | d855497 | 2006-06-26 20:58:46 -0300 | [diff] [blame] | 107 | { |
Mike Isely | e5be15c | 2008-04-07 02:22:04 -0300 | [diff] [blame] | 108 | pvr2_context_set_notify(mp,!0); |
Mike Isely | 794b160 | 2008-04-22 14:45:45 -0300 | [diff] [blame] | 109 | } |
Mike Isely | d855497 | 2006-06-26 20:58:46 -0300 | [diff] [blame] | 110 | |
Mike Isely | 794b160 | 2008-04-22 14:45:45 -0300 | [diff] [blame] | 111 | |
Mike Isely | e5be15c | 2008-04-07 02:22:04 -0300 | [diff] [blame] | 112 | static void pvr2_context_check(struct pvr2_context *mp) |
Mike Isely | 794b160 | 2008-04-22 14:45:45 -0300 | [diff] [blame] | 113 | { |
Mike Isely | e5be15c | 2008-04-07 02:22:04 -0300 | [diff] [blame] | 114 | struct pvr2_channel *ch1, *ch2; |
| 115 | pvr2_trace(PVR2_TRACE_CTXT, |
| 116 | "pvr2_context %p (notify)", mp); |
| 117 | if (!mp->initialized_flag && !mp->disconnect_flag) { |
| 118 | mp->initialized_flag = !0; |
Mike Isely | 794b160 | 2008-04-22 14:45:45 -0300 | [diff] [blame] | 119 | pvr2_trace(PVR2_TRACE_CTXT, |
Mike Isely | e5be15c | 2008-04-07 02:22:04 -0300 | [diff] [blame] | 120 | "pvr2_context %p (initialize)", mp); |
| 121 | /* Finish hardware initialization */ |
| 122 | if (pvr2_hdw_initialize(mp->hdw, |
| 123 | (void (*)(void *))pvr2_context_notify, |
| 124 | mp)) { |
| 125 | mp->video_stream.stream = |
| 126 | pvr2_hdw_get_video_stream(mp->hdw); |
| 127 | /* Trigger interface initialization. By doing this |
| 128 | here initialization runs in our own safe and |
| 129 | cozy thread context. */ |
| 130 | if (mp->setup_func) mp->setup_func(mp); |
| 131 | } else { |
| 132 | pvr2_trace(PVR2_TRACE_CTXT, |
| 133 | "pvr2_context %p (thread skipping setup)", |
| 134 | mp); |
| 135 | /* Even though initialization did not succeed, |
| 136 | we're still going to continue anyway. We need |
| 137 | to do this in order to await the expected |
| 138 | disconnect (which we will detect in the normal |
| 139 | course of operation). */ |
| 140 | } |
Mike Isely | 681c739 | 2007-11-26 01:48:52 -0300 | [diff] [blame] | 141 | } |
David Howells | c402895 | 2006-11-22 14:57:56 +0000 | [diff] [blame] | 142 | |
Mike Isely | e5be15c | 2008-04-07 02:22:04 -0300 | [diff] [blame] | 143 | for (ch1 = mp->mc_first; ch1; ch1 = ch2) { |
| 144 | ch2 = ch1->mc_next; |
| 145 | if (ch1->check_func) ch1->check_func(ch1); |
Mike Isely | 794b160 | 2008-04-22 14:45:45 -0300 | [diff] [blame] | 146 | } |
Mike Isely | e5be15c | 2008-04-07 02:22:04 -0300 | [diff] [blame] | 147 | |
| 148 | if (mp->disconnect_flag && !mp->mc_first) { |
| 149 | /* Go away... */ |
| 150 | pvr2_context_destroy(mp); |
| 151 | return; |
| 152 | } |
| 153 | } |
| 154 | |
| 155 | |
| 156 | static int pvr2_context_shutok(void) |
| 157 | { |
Mike Isely | 18ecbb4 | 2008-04-09 05:14:11 -0300 | [diff] [blame] | 158 | return pvr2_context_cleanup_flag && (pvr2_context_exist_first == NULL); |
Mike Isely | e5be15c | 2008-04-07 02:22:04 -0300 | [diff] [blame] | 159 | } |
| 160 | |
| 161 | |
| 162 | static int pvr2_context_thread_func(void *foo) |
| 163 | { |
| 164 | struct pvr2_context *mp; |
| 165 | |
| 166 | pvr2_trace(PVR2_TRACE_CTXT,"pvr2_context thread start"); |
| 167 | |
| 168 | do { |
| 169 | while ((mp = pvr2_context_notify_first) != NULL) { |
| 170 | pvr2_context_set_notify(mp, 0); |
| 171 | pvr2_context_check(mp); |
| 172 | } |
| 173 | wait_event_interruptible( |
| 174 | pvr2_context_sync_data, |
| 175 | ((pvr2_context_notify_first != NULL) || |
| 176 | pvr2_context_shutok())); |
| 177 | } while (!pvr2_context_shutok()); |
| 178 | |
Mike Isely | 18ecbb4 | 2008-04-09 05:14:11 -0300 | [diff] [blame] | 179 | pvr2_context_cleaned_flag = !0; |
| 180 | wake_up(&pvr2_context_cleanup_data); |
| 181 | |
| 182 | pvr2_trace(PVR2_TRACE_CTXT,"pvr2_context thread cleaned up"); |
| 183 | |
| 184 | wait_event_interruptible( |
| 185 | pvr2_context_sync_data, |
| 186 | kthread_should_stop()); |
| 187 | |
Mike Isely | e5be15c | 2008-04-07 02:22:04 -0300 | [diff] [blame] | 188 | pvr2_trace(PVR2_TRACE_CTXT,"pvr2_context thread end"); |
| 189 | |
Mike Isely | 794b160 | 2008-04-22 14:45:45 -0300 | [diff] [blame] | 190 | return 0; |
| 191 | } |
Mike Isely | d855497 | 2006-06-26 20:58:46 -0300 | [diff] [blame] | 192 | |
| 193 | |
Mike Isely | e5be15c | 2008-04-07 02:22:04 -0300 | [diff] [blame] | 194 | int pvr2_context_global_init(void) |
| 195 | { |
| 196 | pvr2_context_thread_ptr = kthread_run(pvr2_context_thread_func, |
Harvey Harrison | a6a3a17 | 2008-04-28 16:50:03 -0700 | [diff] [blame] | 197 | NULL, |
Mike Isely | e5be15c | 2008-04-07 02:22:04 -0300 | [diff] [blame] | 198 | "pvrusb2-context"); |
| 199 | return (pvr2_context_thread_ptr ? 0 : -ENOMEM); |
| 200 | } |
| 201 | |
| 202 | |
| 203 | void pvr2_context_global_done(void) |
| 204 | { |
Mike Isely | 18ecbb4 | 2008-04-09 05:14:11 -0300 | [diff] [blame] | 205 | pvr2_context_cleanup_flag = !0; |
| 206 | wake_up(&pvr2_context_sync_data); |
| 207 | wait_event_interruptible( |
| 208 | pvr2_context_cleanup_data, |
| 209 | pvr2_context_cleaned_flag); |
Mike Isely | e5be15c | 2008-04-07 02:22:04 -0300 | [diff] [blame] | 210 | kthread_stop(pvr2_context_thread_ptr); |
| 211 | } |
| 212 | |
| 213 | |
Mike Isely | d855497 | 2006-06-26 20:58:46 -0300 | [diff] [blame] | 214 | struct pvr2_context *pvr2_context_create( |
| 215 | struct usb_interface *intf, |
| 216 | const struct usb_device_id *devid, |
| 217 | void (*setup_func)(struct pvr2_context *)) |
| 218 | { |
Mike Isely | a0fd1cb | 2006-06-30 11:35:28 -0300 | [diff] [blame] | 219 | struct pvr2_context *mp = NULL; |
Mike Isely | ca545f7 | 2007-01-20 00:37:11 -0300 | [diff] [blame] | 220 | mp = kzalloc(sizeof(*mp),GFP_KERNEL); |
Mike Isely | d855497 | 2006-06-26 20:58:46 -0300 | [diff] [blame] | 221 | if (!mp) goto done; |
Mike Isely | 794b160 | 2008-04-22 14:45:45 -0300 | [diff] [blame] | 222 | pvr2_trace(PVR2_TRACE_CTXT,"pvr2_context %p (create)",mp); |
Mike Isely | d855497 | 2006-06-26 20:58:46 -0300 | [diff] [blame] | 223 | mp->setup_func = setup_func; |
| 224 | mutex_init(&mp->mutex); |
Mike Isely | e5be15c | 2008-04-07 02:22:04 -0300 | [diff] [blame] | 225 | mutex_lock(&pvr2_context_mutex); |
| 226 | mp->exist_prev = pvr2_context_exist_last; |
| 227 | mp->exist_next = NULL; |
| 228 | pvr2_context_exist_last = mp; |
| 229 | if (mp->exist_prev) { |
| 230 | mp->exist_prev->exist_next = mp; |
| 231 | } else { |
| 232 | pvr2_context_exist_first = mp; |
| 233 | } |
| 234 | mutex_unlock(&pvr2_context_mutex); |
Mike Isely | d855497 | 2006-06-26 20:58:46 -0300 | [diff] [blame] | 235 | mp->hdw = pvr2_hdw_create(intf,devid); |
| 236 | if (!mp->hdw) { |
| 237 | pvr2_context_destroy(mp); |
Mike Isely | a0fd1cb | 2006-06-30 11:35:28 -0300 | [diff] [blame] | 238 | mp = NULL; |
Mike Isely | d855497 | 2006-06-26 20:58:46 -0300 | [diff] [blame] | 239 | goto done; |
| 240 | } |
Mike Isely | e5be15c | 2008-04-07 02:22:04 -0300 | [diff] [blame] | 241 | pvr2_context_set_notify(mp, !0); |
Mike Isely | d855497 | 2006-06-26 20:58:46 -0300 | [diff] [blame] | 242 | done: |
| 243 | return mp; |
| 244 | } |
| 245 | |
| 246 | |
Mike Isely | 1cb03b7 | 2008-04-21 03:47:43 -0300 | [diff] [blame] | 247 | static void pvr2_context_reset_input_limits(struct pvr2_context *mp) |
| 248 | { |
| 249 | unsigned int tmsk,mmsk; |
| 250 | struct pvr2_channel *cp; |
| 251 | struct pvr2_hdw *hdw = mp->hdw; |
| 252 | mmsk = pvr2_hdw_get_input_available(hdw); |
| 253 | tmsk = mmsk; |
| 254 | for (cp = mp->mc_first; cp; cp = cp->mc_next) { |
| 255 | if (!cp->input_mask) continue; |
| 256 | tmsk &= cp->input_mask; |
| 257 | } |
| 258 | pvr2_hdw_set_input_allowed(hdw,mmsk,tmsk); |
| 259 | pvr2_hdw_commit_ctl(hdw); |
| 260 | } |
| 261 | |
| 262 | |
Mike Isely | 794b160 | 2008-04-22 14:45:45 -0300 | [diff] [blame] | 263 | static void pvr2_context_enter(struct pvr2_context *mp) |
Mike Isely | d855497 | 2006-06-26 20:58:46 -0300 | [diff] [blame] | 264 | { |
| 265 | mutex_lock(&mp->mutex); |
Mike Isely | d855497 | 2006-06-26 20:58:46 -0300 | [diff] [blame] | 266 | } |
| 267 | |
| 268 | |
Mike Isely | 794b160 | 2008-04-22 14:45:45 -0300 | [diff] [blame] | 269 | static void pvr2_context_exit(struct pvr2_context *mp) |
Mike Isely | d855497 | 2006-06-26 20:58:46 -0300 | [diff] [blame] | 270 | { |
| 271 | int destroy_flag = 0; |
| 272 | if (!(mp->mc_first || !mp->disconnect_flag)) { |
| 273 | destroy_flag = !0; |
| 274 | } |
Mike Isely | d855497 | 2006-06-26 20:58:46 -0300 | [diff] [blame] | 275 | mutex_unlock(&mp->mutex); |
Mike Isely | 794b160 | 2008-04-22 14:45:45 -0300 | [diff] [blame] | 276 | if (destroy_flag) pvr2_context_notify(mp); |
Mike Isely | d855497 | 2006-06-26 20:58:46 -0300 | [diff] [blame] | 277 | } |
| 278 | |
| 279 | |
| 280 | void pvr2_context_disconnect(struct pvr2_context *mp) |
| 281 | { |
Mike Isely | 794b160 | 2008-04-22 14:45:45 -0300 | [diff] [blame] | 282 | pvr2_hdw_disconnect(mp->hdw); |
| 283 | mp->disconnect_flag = !0; |
| 284 | pvr2_context_notify(mp); |
Mike Isely | d855497 | 2006-06-26 20:58:46 -0300 | [diff] [blame] | 285 | } |
| 286 | |
| 287 | |
| 288 | void pvr2_channel_init(struct pvr2_channel *cp,struct pvr2_context *mp) |
| 289 | { |
Mike Isely | 794b160 | 2008-04-22 14:45:45 -0300 | [diff] [blame] | 290 | pvr2_context_enter(mp); |
Mike Isely | d855497 | 2006-06-26 20:58:46 -0300 | [diff] [blame] | 291 | cp->hdw = mp->hdw; |
| 292 | cp->mc_head = mp; |
Mike Isely | a0fd1cb | 2006-06-30 11:35:28 -0300 | [diff] [blame] | 293 | cp->mc_next = NULL; |
Mike Isely | d855497 | 2006-06-26 20:58:46 -0300 | [diff] [blame] | 294 | cp->mc_prev = mp->mc_last; |
| 295 | if (mp->mc_last) { |
| 296 | mp->mc_last->mc_next = cp; |
| 297 | } else { |
| 298 | mp->mc_first = cp; |
| 299 | } |
| 300 | mp->mc_last = cp; |
Mike Isely | 794b160 | 2008-04-22 14:45:45 -0300 | [diff] [blame] | 301 | pvr2_context_exit(mp); |
Mike Isely | d855497 | 2006-06-26 20:58:46 -0300 | [diff] [blame] | 302 | } |
| 303 | |
| 304 | |
| 305 | static void pvr2_channel_disclaim_stream(struct pvr2_channel *cp) |
| 306 | { |
| 307 | if (!cp->stream) return; |
| 308 | pvr2_stream_kill(cp->stream->stream); |
Mike Isely | a0fd1cb | 2006-06-30 11:35:28 -0300 | [diff] [blame] | 309 | cp->stream->user = NULL; |
| 310 | cp->stream = NULL; |
Mike Isely | d855497 | 2006-06-26 20:58:46 -0300 | [diff] [blame] | 311 | } |
| 312 | |
| 313 | |
| 314 | void pvr2_channel_done(struct pvr2_channel *cp) |
| 315 | { |
| 316 | struct pvr2_context *mp = cp->mc_head; |
Mike Isely | 794b160 | 2008-04-22 14:45:45 -0300 | [diff] [blame] | 317 | pvr2_context_enter(mp); |
Mike Isely | 1cb03b7 | 2008-04-21 03:47:43 -0300 | [diff] [blame] | 318 | cp->input_mask = 0; |
Mike Isely | d855497 | 2006-06-26 20:58:46 -0300 | [diff] [blame] | 319 | pvr2_channel_disclaim_stream(cp); |
Mike Isely | 1cb03b7 | 2008-04-21 03:47:43 -0300 | [diff] [blame] | 320 | pvr2_context_reset_input_limits(mp); |
Mike Isely | d855497 | 2006-06-26 20:58:46 -0300 | [diff] [blame] | 321 | if (cp->mc_next) { |
| 322 | cp->mc_next->mc_prev = cp->mc_prev; |
| 323 | } else { |
| 324 | mp->mc_last = cp->mc_prev; |
| 325 | } |
| 326 | if (cp->mc_prev) { |
| 327 | cp->mc_prev->mc_next = cp->mc_next; |
| 328 | } else { |
| 329 | mp->mc_first = cp->mc_next; |
| 330 | } |
Mike Isely | a0fd1cb | 2006-06-30 11:35:28 -0300 | [diff] [blame] | 331 | cp->hdw = NULL; |
Mike Isely | 794b160 | 2008-04-22 14:45:45 -0300 | [diff] [blame] | 332 | pvr2_context_exit(mp); |
Mike Isely | d855497 | 2006-06-26 20:58:46 -0300 | [diff] [blame] | 333 | } |
| 334 | |
| 335 | |
Mike Isely | 1cb03b7 | 2008-04-21 03:47:43 -0300 | [diff] [blame] | 336 | int pvr2_channel_limit_inputs(struct pvr2_channel *cp,unsigned int cmsk) |
| 337 | { |
| 338 | unsigned int tmsk,mmsk; |
| 339 | int ret = 0; |
| 340 | struct pvr2_channel *p2; |
| 341 | struct pvr2_hdw *hdw = cp->hdw; |
| 342 | |
| 343 | mmsk = pvr2_hdw_get_input_available(hdw); |
| 344 | cmsk &= mmsk; |
| 345 | if (cmsk == cp->input_mask) { |
| 346 | /* No change; nothing to do */ |
| 347 | return 0; |
| 348 | } |
| 349 | |
| 350 | pvr2_context_enter(cp->mc_head); |
| 351 | do { |
| 352 | if (!cmsk) { |
| 353 | cp->input_mask = 0; |
| 354 | pvr2_context_reset_input_limits(cp->mc_head); |
| 355 | break; |
| 356 | } |
| 357 | tmsk = mmsk; |
| 358 | for (p2 = cp->mc_head->mc_first; p2; p2 = p2->mc_next) { |
| 359 | if (p2 == cp) continue; |
| 360 | if (!p2->input_mask) continue; |
| 361 | tmsk &= p2->input_mask; |
| 362 | } |
| 363 | if (!(tmsk & cmsk)) { |
| 364 | ret = -EPERM; |
| 365 | break; |
| 366 | } |
| 367 | tmsk &= cmsk; |
| 368 | if ((ret = pvr2_hdw_set_input_allowed(hdw,mmsk,tmsk)) != 0) { |
| 369 | /* Internal failure changing allowed list; probably |
| 370 | should not happen, but react if it does. */ |
| 371 | break; |
| 372 | } |
| 373 | cp->input_mask = cmsk; |
| 374 | pvr2_hdw_commit_ctl(hdw); |
| 375 | } while (0); |
| 376 | pvr2_context_exit(cp->mc_head); |
| 377 | return ret; |
| 378 | } |
| 379 | |
| 380 | |
| 381 | unsigned int pvr2_channel_get_limited_inputs(struct pvr2_channel *cp) |
| 382 | { |
| 383 | return cp->input_mask; |
| 384 | } |
| 385 | |
| 386 | |
Mike Isely | d855497 | 2006-06-26 20:58:46 -0300 | [diff] [blame] | 387 | int pvr2_channel_claim_stream(struct pvr2_channel *cp, |
| 388 | struct pvr2_context_stream *sp) |
| 389 | { |
| 390 | int code = 0; |
| 391 | pvr2_context_enter(cp->mc_head); do { |
| 392 | if (sp == cp->stream) break; |
Mike Isely | 99a6acf | 2008-04-22 14:45:39 -0300 | [diff] [blame] | 393 | if (sp && sp->user) { |
Mike Isely | d855497 | 2006-06-26 20:58:46 -0300 | [diff] [blame] | 394 | code = -EBUSY; |
| 395 | break; |
| 396 | } |
| 397 | pvr2_channel_disclaim_stream(cp); |
| 398 | if (!sp) break; |
| 399 | sp->user = cp; |
| 400 | cp->stream = sp; |
| 401 | } while (0); pvr2_context_exit(cp->mc_head); |
| 402 | return code; |
| 403 | } |
| 404 | |
| 405 | |
| 406 | // This is the marker for the real beginning of a legitimate mpeg2 stream. |
| 407 | static char stream_sync_key[] = { |
| 408 | 0x00, 0x00, 0x01, 0xba, |
| 409 | }; |
| 410 | |
| 411 | struct pvr2_ioread *pvr2_channel_create_mpeg_stream( |
| 412 | struct pvr2_context_stream *sp) |
| 413 | { |
| 414 | struct pvr2_ioread *cp; |
| 415 | cp = pvr2_ioread_create(); |
Mike Isely | a0fd1cb | 2006-06-30 11:35:28 -0300 | [diff] [blame] | 416 | if (!cp) return NULL; |
Mike Isely | d855497 | 2006-06-26 20:58:46 -0300 | [diff] [blame] | 417 | pvr2_ioread_setup(cp,sp->stream); |
| 418 | pvr2_ioread_set_sync_key(cp,stream_sync_key,sizeof(stream_sync_key)); |
| 419 | return cp; |
| 420 | } |
| 421 | |
| 422 | |
| 423 | /* |
| 424 | Stuff for Emacs to see, in order to encourage consistent editing style: |
| 425 | *** Local Variables: *** |
| 426 | *** mode: c *** |
| 427 | *** fill-column: 75 *** |
| 428 | *** tab-width: 8 *** |
| 429 | *** c-basic-offset: 8 *** |
| 430 | *** End: *** |
| 431 | */ |