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/*
* $Id: pvrusb2-context.c,v 1.2 2006/01/01 08:26:03 mcisely Exp $
*
* Copyright (C) 2005 Mike Isely <isely@pobox.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include "pvrusb2-context.h"
#include "pvrusb2-io.h"
#include "pvrusb2-hdw.h"
#include "pvrusb2-debug.h"
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <asm/semaphore.h>
static void pvr2_context_destroy(struct pvr2_context *mp)
{
if (mp->hdw) pvr2_hdw_destroy(mp->hdw);
pvr2_trace(PVR2_TRACE_STRUCT,"Destroying pvr_main id=%p",mp);
flush_workqueue(mp->workqueue);
destroy_workqueue(mp->workqueue);
kfree(mp);
}
static void pvr2_context_trigger_poll(struct pvr2_context *mp)
{
queue_work(mp->workqueue,&mp->workpoll);
}
static void pvr2_context_poll(struct pvr2_context *mp)
{
pvr2_trace(PVR2_TRACE_DEBUG,"pvr2_context_poll BEGIN");
pvr2_context_enter(mp); do {
pvr2_hdw_poll(mp->hdw);
} while (0); pvr2_context_exit(mp);
pvr2_trace(PVR2_TRACE_DEBUG,"pvr2_context_poll END");
}
static void pvr2_context_setup(struct pvr2_context *mp)
{
pvr2_context_enter(mp); do {
if (!pvr2_hdw_dev_ok(mp->hdw)) break;
pvr2_hdw_setup(mp->hdw);
pvr2_hdw_setup_poll_trigger(
mp->hdw,
(void (*)(void *))pvr2_context_trigger_poll,
mp);
if (!pvr2_hdw_dev_ok(mp->hdw)) break;
if (!pvr2_hdw_init_ok(mp->hdw)) break;
mp->video_stream.stream = pvr2_hdw_get_video_stream(mp->hdw);
if (mp->setup_func) {
mp->setup_func(mp);
}
} while (0); pvr2_context_exit(mp);
}
struct pvr2_context *pvr2_context_create(
struct usb_interface *intf,void (*setup_func)(struct pvr2_context *))
{
struct pvr2_context *mp = 0;
mp = kmalloc(sizeof(*mp),GFP_KERNEL);
if (!mp) goto done;
memset(mp,0,sizeof(*mp));
pvr2_trace(PVR2_TRACE_STRUCT,"Creating pvr_main id=%p",mp);
mp->setup_func = setup_func;
init_MUTEX(&mp->sem);
mp->hdw = pvr2_hdw_create(intf);
if (!mp->hdw) {
pvr2_context_destroy(mp);
mp = 0;
goto done;
}
mp->workqueue = create_singlethread_workqueue("pvrusb2");
INIT_WORK(&mp->workinit,(void (*)(void*))pvr2_context_setup,mp);
INIT_WORK(&mp->workpoll,(void (*)(void*))pvr2_context_poll,mp);
queue_work(mp->workqueue,&mp->workinit);
done:
return mp;
}
void pvr2_context_enter(struct pvr2_context *mp)
{
down(&mp->sem);
pvr2_trace(PVR2_TRACE_CREG,"pvr2_context_enter(id=%p)",mp);
}
void pvr2_context_exit(struct pvr2_context *mp)
{
int destroy_flag = 0;
if (!(mp->mc_first || !mp->disconnect_flag)) {
destroy_flag = !0;
}
pvr2_trace(PVR2_TRACE_CREG,"pvr2_context_exit(id=%p) outside",mp);
up(&mp->sem);
if (destroy_flag) pvr2_context_destroy(mp);
}
static void pvr2_context_run_checks(struct pvr2_context *mp)
{
struct pvr2_channel *ch1,*ch2;
for (ch1 = mp->mc_first; ch1; ch1 = ch2) {
ch2 = ch1->mc_next;
if (ch1->check_func) {
ch1->check_func(ch1);
}
}
}
void pvr2_context_disconnect(struct pvr2_context *mp)
{
pvr2_context_enter(mp); do {
pvr2_hdw_disconnect(mp->hdw);
mp->disconnect_flag = !0;
pvr2_context_run_checks(mp);
} while (0); pvr2_context_exit(mp);
}
void pvr2_channel_init(struct pvr2_channel *cp,struct pvr2_context *mp)
{
cp->hdw = mp->hdw;
cp->mc_head = mp;
cp->mc_next = 0;
cp->mc_prev = mp->mc_last;
if (mp->mc_last) {
mp->mc_last->mc_next = cp;
} else {
mp->mc_first = cp;
}
mp->mc_last = cp;
}
static void pvr2_channel_disclaim_stream(struct pvr2_channel *cp)
{
if (!cp->stream) return;
pvr2_stream_kill(cp->stream->stream);
cp->stream->user = 0;
cp->stream = 0;
}
void pvr2_channel_done(struct pvr2_channel *cp)
{
struct pvr2_context *mp = cp->mc_head;
pvr2_channel_disclaim_stream(cp);
if (cp->mc_next) {
cp->mc_next->mc_prev = cp->mc_prev;
} else {
mp->mc_last = cp->mc_prev;
}
if (cp->mc_prev) {
cp->mc_prev->mc_next = cp->mc_next;
} else {
mp->mc_first = cp->mc_next;
}
cp->hdw = 0;
}
int pvr2_channel_claim_stream(struct pvr2_channel *cp,
struct pvr2_context_stream *sp)
{
int code = 0;
pvr2_context_enter(cp->mc_head); do {
if (sp == cp->stream) break;
if (sp->user) {
code = -EBUSY;
break;
}
pvr2_channel_disclaim_stream(cp);
if (!sp) break;
sp->user = cp;
cp->stream = sp;
} while (0); pvr2_context_exit(cp->mc_head);
return code;
}
/*
Stuff for Emacs to see, in order to encourage consistent editing style:
*** Local Variables: ***
*** mode: c ***
*** fill-column: 75 ***
*** tab-width: 8 ***
*** c-basic-offset: 8 ***
*** End: ***
*/
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