mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-23 20:53:53 +08:00
e61b6fc58b
Signed-off-by: Mike Isely <isely@pobox.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
511 lines
12 KiB
C
511 lines
12 KiB
C
/*
|
|
*
|
|
* $Id$
|
|
*
|
|
* 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-ioread.h"
|
|
#include "pvrusb2-debug.h"
|
|
#include <linux/errno.h>
|
|
#include <linux/string.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/mutex.h>
|
|
#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];
|
|
char *sync_key_ptr;
|
|
unsigned int sync_key_len;
|
|
unsigned int sync_buf_offs;
|
|
unsigned int sync_state;
|
|
unsigned int sync_trashed_count;
|
|
int enabled; // Streaming is on
|
|
int spigot_open; // OK to pass data to client
|
|
int stream_running; // Passing data to client now
|
|
|
|
/* State relevant to current buffer being read */
|
|
struct pvr2_buffer *c_buf;
|
|
char *c_data_ptr;
|
|
unsigned int c_data_len;
|
|
unsigned int c_data_offs;
|
|
struct mutex mutex;
|
|
};
|
|
|
|
static int pvr2_ioread_init(struct pvr2_ioread *cp)
|
|
{
|
|
unsigned int idx;
|
|
|
|
cp->stream = NULL;
|
|
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,NULL);
|
|
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 NULL;
|
|
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 NULL;
|
|
}
|
|
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);
|
|
if (cp->sync_key_ptr) {
|
|
kfree(cp->sync_key_ptr);
|
|
cp->sync_key_ptr = NULL;
|
|
}
|
|
kfree(cp);
|
|
}
|
|
|
|
void pvr2_ioread_set_sync_key(struct pvr2_ioread *cp,
|
|
const char *sync_key_ptr,
|
|
unsigned int sync_key_len)
|
|
{
|
|
if (!cp) return;
|
|
|
|
if (!sync_key_ptr) sync_key_len = 0;
|
|
if ((sync_key_len == cp->sync_key_len) &&
|
|
((!sync_key_len) ||
|
|
(!memcmp(sync_key_ptr,cp->sync_key_ptr,sync_key_len)))) return;
|
|
|
|
if (sync_key_len != cp->sync_key_len) {
|
|
if (cp->sync_key_ptr) {
|
|
kfree(cp->sync_key_ptr);
|
|
cp->sync_key_ptr = NULL;
|
|
}
|
|
cp->sync_key_len = 0;
|
|
if (sync_key_len) {
|
|
cp->sync_key_ptr = kmalloc(sync_key_len,GFP_KERNEL);
|
|
if (cp->sync_key_ptr) {
|
|
cp->sync_key_len = sync_key_len;
|
|
}
|
|
}
|
|
}
|
|
if (!cp->sync_key_len) return;
|
|
memcpy(cp->sync_key_ptr,sync_key_ptr,cp->sync_key_len);
|
|
}
|
|
|
|
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->c_buf = NULL;
|
|
cp->c_data_ptr = NULL;
|
|
cp->c_data_len = 0;
|
|
cp->c_data_offs = 0;
|
|
cp->enabled = 0;
|
|
cp->stream_running = 0;
|
|
cp->spigot_open = 0;
|
|
if (cp->sync_state) {
|
|
pvr2_trace(PVR2_TRACE_DATA_FLOW,
|
|
"/*---TRACE_READ---*/ sync_state <== 0");
|
|
cp->sync_state = 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);
|
|
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->c_buf = NULL;
|
|
cp->c_data_ptr = NULL;
|
|
cp->c_data_len = 0;
|
|
cp->c_data_offs = 0;
|
|
cp->stream_running = 0;
|
|
if (cp->sync_key_len) {
|
|
pvr2_trace(PVR2_TRACE_DATA_FLOW,
|
|
"/*---TRACE_READ---*/ sync_state <== 1");
|
|
cp->sync_state = 1;
|
|
cp->sync_trashed_count = 0;
|
|
cp->sync_buf_offs = 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);
|
|
if (pvr2_stream_get_buffer_count(cp->stream)) {
|
|
pvr2_stream_set_buffer_count(cp->stream,0);
|
|
}
|
|
cp->stream = NULL;
|
|
}
|
|
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;
|
|
}
|
|
|
|
static int pvr2_ioread_get_buffer(struct pvr2_ioread *cp)
|
|
{
|
|
int stat;
|
|
|
|
while (cp->c_data_len <= cp->c_data_offs) {
|
|
if (cp->c_buf) {
|
|
// Flush out current buffer first.
|
|
stat = pvr2_buffer_queue(cp->c_buf);
|
|
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);
|
|
return 0;
|
|
}
|
|
cp->c_buf = NULL;
|
|
cp->c_data_ptr = NULL;
|
|
cp->c_data_len = 0;
|
|
cp->c_data_offs = 0;
|
|
}
|
|
// Now get a freshly filled buffer.
|
|
cp->c_buf = pvr2_stream_get_ready_buffer(cp->stream);
|
|
if (!cp->c_buf) break; // Nothing ready; done.
|
|
cp->c_data_len = pvr2_buffer_get_count(cp->c_buf);
|
|
if (!cp->c_data_len) {
|
|
// Nothing transferred. Was there an error?
|
|
stat = pvr2_buffer_get_status(cp->c_buf);
|
|
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);
|
|
// Give up.
|
|
return 0;
|
|
}
|
|
// Start over...
|
|
continue;
|
|
}
|
|
cp->c_data_offs = 0;
|
|
cp->c_data_ptr = cp->buffer_storage[
|
|
pvr2_buffer_get_id(cp->c_buf)];
|
|
}
|
|
return !0;
|
|
}
|
|
|
|
static void pvr2_ioread_filter(struct pvr2_ioread *cp)
|
|
{
|
|
unsigned int idx;
|
|
if (!cp->enabled) return;
|
|
if (cp->sync_state != 1) return;
|
|
|
|
// Search the stream for our synchronization key. This is made
|
|
// complicated by the fact that in order to be honest with
|
|
// ourselves here we must search across buffer boundaries...
|
|
mutex_lock(&cp->mutex); while (1) {
|
|
// Ensure we have a buffer
|
|
if (!pvr2_ioread_get_buffer(cp)) break;
|
|
if (!cp->c_data_len) break;
|
|
|
|
// Now walk the buffer contents until we match the key or
|
|
// run out of buffer data.
|
|
for (idx = cp->c_data_offs; idx < cp->c_data_len; idx++) {
|
|
if (cp->sync_buf_offs >= cp->sync_key_len) break;
|
|
if (cp->c_data_ptr[idx] ==
|
|
cp->sync_key_ptr[cp->sync_buf_offs]) {
|
|
// Found the next key byte
|
|
(cp->sync_buf_offs)++;
|
|
} else {
|
|
// Whoops, mismatched. Start key over...
|
|
cp->sync_buf_offs = 0;
|
|
}
|
|
}
|
|
|
|
// Consume what we've walked through
|
|
cp->c_data_offs += idx;
|
|
cp->sync_trashed_count += idx;
|
|
|
|
// If we've found the key, then update state and get out.
|
|
if (cp->sync_buf_offs >= cp->sync_key_len) {
|
|
cp->sync_trashed_count -= cp->sync_key_len;
|
|
pvr2_trace(PVR2_TRACE_DATA_FLOW,
|
|
"/*---TRACE_READ---*/"
|
|
" sync_state <== 2 (skipped %u bytes)",
|
|
cp->sync_trashed_count);
|
|
cp->sync_state = 2;
|
|
cp->sync_buf_offs = 0;
|
|
break;
|
|
}
|
|
|
|
if (cp->c_data_offs < cp->c_data_len) {
|
|
// Sanity check - should NEVER get here
|
|
pvr2_trace(PVR2_TRACE_ERROR_LEGS,
|
|
"ERROR: pvr2_ioread filter sync problem"
|
|
" len=%u offs=%u",
|
|
cp->c_data_len,cp->c_data_offs);
|
|
// Get out so we don't get stuck in an infinite
|
|
// loop.
|
|
break;
|
|
}
|
|
|
|
continue; // (for clarity)
|
|
} mutex_unlock(&cp->mutex);
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
if (cp->sync_state == 1) {
|
|
pvr2_ioread_filter(cp);
|
|
if (cp->sync_state == 1) return -EAGAIN;
|
|
}
|
|
|
|
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;
|
|
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 (1) {
|
|
if (!pvr2_ioread_get_buffer(cp)) {
|
|
ret = -EIO;
|
|
break;
|
|
}
|
|
|
|
if (!cnt) break;
|
|
|
|
if (cp->sync_state == 2) {
|
|
// We're repeating the sync key data into
|
|
// the stream.
|
|
src = cp->sync_key_ptr + cp->sync_buf_offs;
|
|
bcnt = cp->sync_key_len - cp->sync_buf_offs;
|
|
} else {
|
|
// Normal buffer copy
|
|
src = cp->c_data_ptr + cp->c_data_offs;
|
|
bcnt = cp->c_data_len - cp->c_data_offs;
|
|
}
|
|
|
|
if (!bcnt) break;
|
|
|
|
// Don't run past user's buffer
|
|
if (bcnt > cnt) bcnt = cnt;
|
|
|
|
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->sync_state == 2) {
|
|
// Update offset inside sync key that we're
|
|
// repeating back out.
|
|
cp->sync_buf_offs += bcnt;
|
|
if (cp->sync_buf_offs >= cp->sync_key_len) {
|
|
// Consumed entire key; switch mode
|
|
// to normal.
|
|
pvr2_trace(PVR2_TRACE_DATA_FLOW,
|
|
"/*---TRACE_READ---*/"
|
|
" sync_state <== 0");
|
|
cp->sync_state = 0;
|
|
}
|
|
} else {
|
|
// Update buffer offset.
|
|
cp->c_data_offs += bcnt;
|
|
}
|
|
}
|
|
|
|
} 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: ***
|
|
*/
|