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Diffstat (limited to 'v4l_experimental/pvrusb2/pvrusb2-ioread.c')
-rw-r--r--v4l_experimental/pvrusb2/pvrusb2-ioread.c367
1 files changed, 0 insertions, 367 deletions
diff --git a/v4l_experimental/pvrusb2/pvrusb2-ioread.c b/v4l_experimental/pvrusb2/pvrusb2-ioread.c
deleted file mode 100644
index 375dd8acb..000000000
--- a/v4l_experimental/pvrusb2/pvrusb2-ioread.c
+++ /dev/null
@@ -1,367 +0,0 @@
-/*
- *
- * $Id: pvrusb2-ioread.c,v 1.2 2006/01/23 06:58:06 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 "compat.h"
-#include "pvrusb2-ioread.h"
-#include "pvrusb2-debug.h"
-#include <linux/errno.h>
-#include <linux/string.h>
-#include <linux/slab.h>
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
-#include <asm/atomic.h>
-#include <asm/mutex.h>
-#else
-#include <asm/semaphore.h>
-#endif
-#include <asm/uaccess.h>
-
-#define BUFFER_COUNT 32
-#define BUFFER_SIZE PAGE_ALIGN(0x4000)
-
-struct pvr2_ioread {
- struct pvr2_stream *stream;
- char *buffer_storage[BUFFER_COUNT];
- int resid_offs;
- int enabled;
- int stream_running;
- int spigot_open;
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
- struct mutex mutex;
-#else
- struct semaphore mutex;
-#endif
-};
-
-static int pvr2_ioread_init(struct pvr2_ioread *cp)
-{
- unsigned int idx;
-
- cp->stream = 0;
- mutex_init(&cp->mutex);
-
- for (idx = 0; idx < BUFFER_COUNT; idx++) {
- cp->buffer_storage[idx] = kmalloc(BUFFER_SIZE,GFP_KERNEL);
- if (!(cp->buffer_storage[idx])) break;
- }
-
- if (idx < BUFFER_COUNT) {
- // An allocation appears to have failed
- for (idx = 0; idx < BUFFER_COUNT; idx++) {
- if (!(cp->buffer_storage[idx])) continue;
- kfree(cp->buffer_storage[idx]);
- }
- return -ENOMEM;
- }
- return 0;
-}
-
-static void pvr2_ioread_done(struct pvr2_ioread *cp)
-{
- unsigned int idx;
-
- pvr2_ioread_setup(cp,0);
- for (idx = 0; idx < BUFFER_COUNT; idx++) {
- if (!(cp->buffer_storage[idx])) continue;
- kfree(cp->buffer_storage[idx]);
- }
-}
-
-struct pvr2_ioread *pvr2_ioread_create(void)
-{
- struct pvr2_ioread *cp;
- cp = kmalloc(sizeof(*cp),GFP_KERNEL);
- if (!cp) return 0;
- pvr2_trace(PVR2_TRACE_STRUCT,"pvr2_ioread_create id=%p",cp);
- memset(cp,0,sizeof(*cp));
- if (pvr2_ioread_init(cp) < 0) {
- kfree(cp);
- return 0;
- }
- return cp;
-}
-
-void pvr2_ioread_destroy(struct pvr2_ioread *cp)
-{
- if (!cp) return;
- pvr2_ioread_done(cp);
- pvr2_trace(PVR2_TRACE_STRUCT,"pvr2_ioread_destroy id=%p",cp);
- kfree(cp);
-}
-
-static void pvr2_ioread_stop(struct pvr2_ioread *cp)
-{
- if (!(cp->enabled)) return;
- pvr2_trace(PVR2_TRACE_START_STOP,
- "/*---TRACE_READ---*/ pvr2_ioread_stop id=%p",cp);
- pvr2_stream_kill(cp->stream);
- cp->resid_offs = 0;
- cp->enabled = 0;
- cp->stream_running = 0;
- cp->spigot_open = 0;
-}
-
-static int pvr2_ioread_start(struct pvr2_ioread *cp)
-{
- int stat;
- struct pvr2_buffer *bp;
- if (cp->enabled) return 0;
- if (!(cp->stream)) return 0;
- pvr2_trace(PVR2_TRACE_START_STOP,
- "/*---TRACE_READ---*/ pvr2_ioread_start id=%p",cp);
- cp->resid_offs = 0;
- while ((bp = pvr2_stream_get_idle_buffer(cp->stream)) != 0) {
- stat = pvr2_buffer_queue(bp);
- if (stat < 0) {
- pvr2_trace(PVR2_TRACE_DATA_FLOW,
- "/*---TRACE_READ---*/"
- " pvr2_ioread_start id=%p"
- " error=%d",
- cp,stat);
- pvr2_ioread_stop(cp);
- return stat;
- }
- }
- cp->enabled = !0;
- cp->stream_running = 0;
- cp->spigot_open = 0;
- return 0;
-}
-
-struct pvr2_stream *pvr2_ioread_get_stream(struct pvr2_ioread *cp)
-{
- return cp->stream;
-}
-
-int pvr2_ioread_setup(struct pvr2_ioread *cp,struct pvr2_stream *sp)
-{
- int ret;
- unsigned int idx;
- struct pvr2_buffer *bp;
-
- mutex_lock(&cp->mutex); do {
- if (cp->stream) {
- pvr2_trace(PVR2_TRACE_START_STOP,
- "/*---TRACE_READ---*/"
- " pvr2_ioread_setup (tear-down) id=%p",cp);
- pvr2_ioread_stop(cp);
- pvr2_stream_kill(cp->stream);
- pvr2_stream_set_buffer_count(cp->stream,0);
- cp->stream = 0;
- }
- if (sp) {
- pvr2_trace(PVR2_TRACE_START_STOP,
- "/*---TRACE_READ---*/"
- " pvr2_ioread_setup (setup) id=%p",cp);
- pvr2_stream_kill(sp);
- ret = pvr2_stream_set_buffer_count(sp,BUFFER_COUNT);
- if (ret < 0) return ret;
- for (idx = 0; idx < BUFFER_COUNT; idx++) {
- bp = pvr2_stream_get_buffer(sp,idx);
- pvr2_buffer_set_buffer(bp,
- cp->buffer_storage[idx],
- BUFFER_SIZE);
- }
- cp->stream = sp;
- }
- } while (0); mutex_unlock(&cp->mutex);
-
- return 0;
-}
-
-int pvr2_ioread_set_enabled(struct pvr2_ioread *cp,int fl)
-{
- int ret = 0;
- if ((!fl) == (!(cp->enabled))) return ret;
-
- mutex_lock(&cp->mutex); do {
- if (fl) {
- ret = pvr2_ioread_start(cp);
- } else {
- pvr2_ioread_stop(cp);
- }
- } while (0); mutex_unlock(&cp->mutex);
- return ret;
-}
-
-int pvr2_ioread_get_enabled(struct pvr2_ioread *cp)
-{
- return cp->enabled != 0;
-}
-
-int pvr2_ioread_avail(struct pvr2_ioread *cp)
-{
- int ret;
- if (!(cp->enabled)) {
- // Stream is not enabled; so this is an I/O error
- return -EIO;
- }
-
- ret = 0;
- if (cp->stream_running) {
- if (!pvr2_stream_get_ready_count(cp->stream)) {
- // No data available at all right now.
- ret = -EAGAIN;
- }
- } else {
- if (pvr2_stream_get_ready_count(cp->stream) < BUFFER_COUNT/2) {
- // Haven't buffered up enough yet; try again later
- ret = -EAGAIN;
- }
- }
-
- if ((!(cp->spigot_open)) != (!(ret == 0))) {
- cp->spigot_open = (ret == 0);
- pvr2_trace(PVR2_TRACE_DATA_FLOW,
- "/*---TRACE_READ---*/ data is %s",
- cp->spigot_open ? "available" : "pending");
- }
-
- return ret;
-}
-
-int pvr2_ioread_read(struct pvr2_ioread *cp,void __user *buf,unsigned int cnt)
-{
- unsigned int copied_cnt;
- unsigned int bcnt;
- const char *src;
- int stat;
- struct pvr2_buffer *bp;
- int ret = 0;
- unsigned int req_cnt = cnt;
-
- if (!cnt) {
- pvr2_trace(PVR2_TRACE_TRAP,
- "/*---TRACE_READ---*/ pvr2_ioread_read id=%p"
- " ZERO Request? Returning zero.",cp);
- return 0;
- }
-
- stat = pvr2_ioread_avail(cp);
- if (stat < 0) return stat;
-
- cp->stream_running = !0;
-
- mutex_lock(&cp->mutex); do {
-
- // Suck data out of the buffers and copy to the user
- copied_cnt = 0;
- if (!buf) cnt = 0;
- while (cnt) {
- bp = pvr2_stream_get_ready_buffer(cp->stream);
- if (!bp) break; // Nothing ready; done
-
- bcnt = pvr2_buffer_get_count(bp);
- if (!bcnt) {
- // Nothing transferred. Was there an
- // error?
- stat = pvr2_buffer_get_status(bp);
- if (stat < 0) {
- // Streaming error...
- pvr2_trace(PVR2_TRACE_DATA_FLOW,
- "/*---TRACE_READ---*/"
- " pvr2_ioread_read id=%p"
- " buffer_error=%d",
- cp,stat);
- pvr2_ioread_stop(cp);
- ret = -EIO;
- break;
- }
- src = 0;
- } else {
- // Calculate buffer offset and count
- src = cp->buffer_storage[
- pvr2_buffer_get_id(bp)];
- if (cp->resid_offs > bcnt) {
- cp->resid_offs = bcnt;
- }
- src += cp->resid_offs;
- bcnt -= cp->resid_offs;
- }
- if (bcnt > cnt) {
- // Can't read the entire buffer this time
- // so remember how far in we're going to
- // get so we can resume it later
- bcnt = cnt;
- cp->resid_offs += bcnt;
- } else {
- // We will be able to get the whole thing,
- // so clear the residual offset
- cp->resid_offs = 0;
- }
- if (bcnt) {
- if (copy_to_user(buf,src,bcnt)) {
- // User supplied a bad pointer?
- // Give up - this *will* cause data
- // to be lost.
- ret = -EFAULT;
- break;
- }
- cnt -= bcnt;
- buf += bcnt;
- copied_cnt += bcnt;
- }
- if (cp->resid_offs) break; // If there's a residual
- // offset, get out
- // Queue the buffer now that we've consumed it.
- stat = pvr2_buffer_queue(bp);
- if (stat < 0) {
- // Streaming error...
- pvr2_trace(PVR2_TRACE_DATA_FLOW,
- "/*---TRACE_READ---*/"
- " pvr2_ioread_read id=%p"
- " queue_error=%d",
- cp,stat);
- pvr2_ioread_stop(cp);
- ret = stat;
- break;
- }
- }
-
- } while (0); mutex_unlock(&cp->mutex);
-
- if (!ret) {
- if (copied_cnt) {
- // If anything was copied, return that count
- ret = copied_cnt;
- } else {
- // Nothing copied; suggest to caller that another
- // attempt should be tried again later
- ret = -EAGAIN;
- }
- }
-
- pvr2_trace(PVR2_TRACE_DATA_FLOW,
- "/*---TRACE_READ---*/ pvr2_ioread_read"
- " id=%p request=%d result=%d",
- cp,req_cnt,ret);
- return ret;
-}
-
-
-/*
- 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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