diff options
Diffstat (limited to 'drivers/media/video/pvrusb2/pvrusb2-io.c')
| -rw-r--r-- | drivers/media/video/pvrusb2/pvrusb2-io.c | 695 |
1 files changed, 695 insertions, 0 deletions
diff --git a/drivers/media/video/pvrusb2/pvrusb2-io.c b/drivers/media/video/pvrusb2/pvrusb2-io.c new file mode 100644 index 000000000000..a984c91f571c --- /dev/null +++ b/drivers/media/video/pvrusb2/pvrusb2-io.c @@ -0,0 +1,695 @@ +/* + * + * $Id$ + * + * 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-io.h" +#include "pvrusb2-debug.h" +#include <linux/errno.h> +#include <linux/string.h> +#include <linux/slab.h> +#include <linux/mutex.h> + +#define BUFFER_SIG 0x47653271 + +// #define SANITY_CHECK_BUFFERS + + +#ifdef SANITY_CHECK_BUFFERS +#define BUFFER_CHECK(bp) do { \ + if ((bp)->signature != BUFFER_SIG) { \ + pvr2_trace(PVR2_TRACE_ERROR_LEGS, \ + "Buffer %p is bad at %s:%d", \ + (bp),__FILE__,__LINE__); \ + pvr2_buffer_describe(bp,"BadSig"); \ + BUG(); \ + } \ +} while (0) +#else +#define BUFFER_CHECK(bp) do {} while(0) +#endif + +struct pvr2_stream { + /* Buffers queued for reading */ + struct list_head queued_list; + unsigned int q_count; + unsigned int q_bcount; + /* Buffers with retrieved data */ + struct list_head ready_list; + unsigned int r_count; + unsigned int r_bcount; + /* Buffers available for use */ + struct list_head idle_list; + unsigned int i_count; + unsigned int i_bcount; + /* Pointers to all buffers */ + struct pvr2_buffer **buffers; + /* Array size of buffers */ + unsigned int buffer_slot_count; + /* Total buffers actually in circulation */ + unsigned int buffer_total_count; + /* Designed number of buffers to be in circulation */ + unsigned int buffer_target_count; + /* Executed when ready list become non-empty */ + pvr2_stream_callback callback_func; + void *callback_data; + /* Context for transfer endpoint */ + struct usb_device *dev; + int endpoint; + /* Overhead for mutex enforcement */ + spinlock_t list_lock; + struct mutex mutex; + /* Tracking state for tolerating errors */ + unsigned int fail_count; + unsigned int fail_tolerance; +}; + +struct pvr2_buffer { + int id; + int signature; + enum pvr2_buffer_state state; + void *ptr; /* Pointer to storage area */ + unsigned int max_count; /* Size of storage area */ + unsigned int used_count; /* Amount of valid data in storage area */ + int status; /* Transfer result status */ + struct pvr2_stream *stream; + struct list_head list_overhead; + struct urb *purb; +}; + +const char *pvr2_buffer_state_decode(enum pvr2_buffer_state st) +{ + switch (st) { + case pvr2_buffer_state_none: return "none"; + case pvr2_buffer_state_idle: return "idle"; + case pvr2_buffer_state_queued: return "queued"; + case pvr2_buffer_state_ready: return "ready"; + } + return "unknown"; +} + +void pvr2_buffer_describe(struct pvr2_buffer *bp,const char *msg) +{ + pvr2_trace(PVR2_TRACE_INFO, + "buffer%s%s %p state=%s id=%d status=%d" + " stream=%p purb=%p sig=0x%x", + (msg ? " " : ""), + (msg ? msg : ""), + bp, + (bp ? pvr2_buffer_state_decode(bp->state) : "(invalid)"), + (bp ? bp->id : 0), + (bp ? bp->status : 0), + (bp ? bp->stream : 0), + (bp ? bp->purb : 0), + (bp ? bp->signature : 0)); +} + +static void pvr2_buffer_remove(struct pvr2_buffer *bp) +{ + unsigned int *cnt; + unsigned int *bcnt; + unsigned int ccnt; + struct pvr2_stream *sp = bp->stream; + switch (bp->state) { + case pvr2_buffer_state_idle: + cnt = &sp->i_count; + bcnt = &sp->i_bcount; + ccnt = bp->max_count; + break; + case pvr2_buffer_state_queued: + cnt = &sp->q_count; + bcnt = &sp->q_bcount; + ccnt = bp->max_count; + break; + case pvr2_buffer_state_ready: + cnt = &sp->r_count; + bcnt = &sp->r_bcount; + ccnt = bp->used_count; + break; + default: + return; + } + list_del_init(&bp->list_overhead); + (*cnt)--; + (*bcnt) -= ccnt; + pvr2_trace(PVR2_TRACE_BUF_FLOW, + "/*---TRACE_FLOW---*/" + " bufferPool %8s dec cap=%07d cnt=%02d", + pvr2_buffer_state_decode(bp->state),*bcnt,*cnt); + bp->state = pvr2_buffer_state_none; +} + +static void pvr2_buffer_set_none(struct pvr2_buffer *bp) +{ + unsigned long irq_flags; + struct pvr2_stream *sp; + BUFFER_CHECK(bp); + sp = bp->stream; + pvr2_trace(PVR2_TRACE_BUF_FLOW, + "/*---TRACE_FLOW---*/ bufferState %p %6s --> %6s", + bp, + pvr2_buffer_state_decode(bp->state), + pvr2_buffer_state_decode(pvr2_buffer_state_none)); + spin_lock_irqsave(&sp->list_lock,irq_flags); + pvr2_buffer_remove(bp); + spin_unlock_irqrestore(&sp->list_lock,irq_flags); +} + +static int pvr2_buffer_set_ready(struct pvr2_buffer *bp) +{ + int fl; + unsigned long irq_flags; + struct pvr2_stream *sp; + BUFFER_CHECK(bp); + sp = bp->stream; + pvr2_trace(PVR2_TRACE_BUF_FLOW, + "/*---TRACE_FLOW---*/ bufferState %p %6s --> %6s", + bp, + pvr2_buffer_state_decode(bp->state), + pvr2_buffer_state_decode(pvr2_buffer_state_ready)); + spin_lock_irqsave(&sp->list_lock,irq_flags); + fl = (sp->r_count == 0); + pvr2_buffer_remove(bp); + list_add_tail(&bp->list_overhead,&sp->ready_list); + bp->state = pvr2_buffer_state_ready; + (sp->r_count)++; + sp->r_bcount += bp->used_count; + pvr2_trace(PVR2_TRACE_BUF_FLOW, + "/*---TRACE_FLOW---*/" + " bufferPool %8s inc cap=%07d cnt=%02d", + pvr2_buffer_state_decode(bp->state), + sp->r_bcount,sp->r_count); + spin_unlock_irqrestore(&sp->list_lock,irq_flags); + return fl; +} + +static void pvr2_buffer_set_idle(struct pvr2_buffer *bp) +{ + unsigned long irq_flags; + struct pvr2_stream *sp; + BUFFER_CHECK(bp); + sp = bp->stream; + pvr2_trace(PVR2_TRACE_BUF_FLOW, + "/*---TRACE_FLOW---*/ bufferState %p %6s --> %6s", + bp, + pvr2_buffer_state_decode(bp->state), + pvr2_buffer_state_decode(pvr2_buffer_state_idle)); + spin_lock_irqsave(&sp->list_lock,irq_flags); + pvr2_buffer_remove(bp); + list_add_tail(&bp->list_overhead,&sp->idle_list); + bp->state = pvr2_buffer_state_idle; + (sp->i_count)++; + sp->i_bcount += bp->max_count; + pvr2_trace(PVR2_TRACE_BUF_FLOW, + "/*---TRACE_FLOW---*/" + " bufferPool %8s inc cap=%07d cnt=%02d", + pvr2_buffer_state_decode(bp->state), + sp->i_bcount,sp->i_count); + spin_unlock_irqrestore(&sp->list_lock,irq_flags); +} + +static void pvr2_buffer_set_queued(struct pvr2_buffer *bp) +{ + unsigned long irq_flags; + struct pvr2_stream *sp; + BUFFER_CHECK(bp); + sp = bp->stream; + pvr2_trace(PVR2_TRACE_BUF_FLOW, + "/*---TRACE_FLOW---*/ bufferState %p %6s --> %6s", + bp, + pvr2_buffer_state_decode(bp->state), + pvr2_buffer_state_decode(pvr2_buffer_state_queued)); + spin_lock_irqsave(&sp->list_lock,irq_flags); + pvr2_buffer_remove(bp); + list_add_tail(&bp->list_overhead,&sp->queued_list); + bp->state = pvr2_buffer_state_queued; + (sp->q_count)++; + sp->q_bcount += bp->max_count; + pvr2_trace(PVR2_TRACE_BUF_FLOW, + "/*---TRACE_FLOW---*/" + " bufferPool %8s inc cap=%07d cnt=%02d", + pvr2_buffer_state_decode(bp->state), + sp->q_bcount,sp->q_count); + spin_unlock_irqrestore(&sp->list_lock,irq_flags); +} + +static void pvr2_buffer_wipe(struct pvr2_buffer *bp) +{ + if (bp->state == pvr2_buffer_state_queued) { + usb_kill_urb(bp->purb); + } +} + +static int pvr2_buffer_init(struct pvr2_buffer *bp, + struct pvr2_stream *sp, + unsigned int id) +{ + memset(bp,0,sizeof(*bp)); + bp->signature = BUFFER_SIG; + bp->id = id; + pvr2_trace(PVR2_TRACE_BUF_POOL, + "/*---TRACE_FLOW---*/ bufferInit %p stream=%p",bp,sp); + bp->stream = sp; + bp->state = pvr2_buffer_state_none; + INIT_LIST_HEAD(&bp->list_overhead); + bp->purb = usb_alloc_urb(0,GFP_KERNEL); + if (! bp->purb) return -ENOMEM; +#ifdef SANITY_CHECK_BUFFERS + pvr2_buffer_describe(bp,"create"); +#endif + return 0; +} + +static void pvr2_buffer_done(struct pvr2_buffer *bp) +{ +#ifdef SANITY_CHECK_BUFFERS + pvr2_buffer_describe(bp,"delete"); +#endif + pvr2_buffer_wipe(bp); + pvr2_buffer_set_none(bp); + bp->signature = 0; + bp->stream = 0; + if (bp->purb) usb_free_urb(bp->purb); + pvr2_trace(PVR2_TRACE_BUF_POOL,"/*---TRACE_FLOW---*/" + " bufferDone %p",bp); +} + +static int pvr2_stream_buffer_count(struct pvr2_stream *sp,unsigned int cnt) +{ + int ret; + unsigned int scnt; + + /* Allocate buffers pointer array in multiples of 32 entries */ + if (cnt == sp->buffer_total_count) return 0; + + pvr2_trace(PVR2_TRACE_BUF_POOL, + "/*---TRACE_FLOW---*/ poolResize " + " stream=%p cur=%d adj=%+d", + sp, + sp->buffer_total_count, + cnt-sp->buffer_total_count); + + scnt = cnt & ~0x1f; + if (cnt > scnt) scnt += 0x20; + + if (cnt > sp->buffer_total_count) { + if (scnt > sp->buffer_slot_count) { + struct pvr2_buffer **nb; + nb = kmalloc(scnt * sizeof(*nb),GFP_KERNEL); + if (!nb) return -ENOMEM; + if (sp->buffer_slot_count) { + memcpy(nb,sp->buffers, + sp->buffer_slot_count * sizeof(*nb)); + kfree(sp->buffers); + } + sp->buffers = nb; + sp->buffer_slot_count = scnt; + } + while (sp->buffer_total_count < cnt) { + struct pvr2_buffer *bp; + bp = kmalloc(sizeof(*bp),GFP_KERNEL); + if (!bp) return -ENOMEM; + ret = pvr2_buffer_init(bp,sp,sp->buffer_total_count); + if (ret) { + kfree(bp); + return -ENOMEM; + } + sp->buffers[sp->buffer_total_count] = bp; + (sp->buffer_total_count)++; + pvr2_buffer_set_idle(bp); + } + } else { + while (sp->buffer_total_count > cnt) { + struct pvr2_buffer *bp; + bp = sp->buffers[sp->buffer_total_count - 1]; + /* Paranoia */ + sp->buffers[sp->buffer_total_count - 1] = 0; + (sp->buffer_total_count)--; + pvr2_buffer_done(bp); + kfree(bp); + } + if (scnt < sp->buffer_slot_count) { + struct pvr2_buffer **nb = 0; + if (scnt) { + nb = kmalloc(scnt * sizeof(*nb),GFP_KERNEL); + if (!nb) return -ENOMEM; + memcpy(nb,sp->buffers,scnt * sizeof(*nb)); + } + kfree(sp->buffers); + sp->buffers = nb; + sp->buffer_slot_count = scnt; + } + } + return 0; +} + +static int pvr2_stream_achieve_buffer_count(struct pvr2_stream *sp) +{ + struct pvr2_buffer *bp; + unsigned int cnt; + + if (sp->buffer_total_count == sp->buffer_target_count) return 0; + + pvr2_trace(PVR2_TRACE_BUF_POOL, + "/*---TRACE_FLOW---*/" + " poolCheck stream=%p cur=%d tgt=%d", + sp,sp->buffer_total_count,sp->buffer_target_count); + + if (sp->buffer_total_count < sp->buffer_target_count) { + return pvr2_stream_buffer_count(sp,sp->buffer_target_count); + } + + cnt = 0; + while ((sp->buffer_total_count - cnt) > sp->buffer_target_count) { + bp = sp->buffers[sp->buffer_total_count - (cnt + 1)]; + if (bp->state != pvr2_buffer_state_idle) break; + cnt++; + } + if (cnt) { + pvr2_stream_buffer_count(sp,sp->buffer_total_count - cnt); + } + + return 0; +} + +static void pvr2_stream_internal_flush(struct pvr2_stream *sp) +{ + struct list_head *lp; + struct pvr2_buffer *bp1; + while ((lp = sp->queued_list.next) != &sp->queued_list) { + bp1 = list_entry(lp,struct pvr2_buffer,list_overhead); + pvr2_buffer_wipe(bp1); + /* At this point, we should be guaranteed that no + completion callback may happen on this buffer. But it's + possible that it might have completed after we noticed + it but before we wiped it. So double check its status + here first. */ + if (bp1->state != pvr2_buffer_state_queued) continue; + pvr2_buffer_set_idle(bp1); + } + if (sp->buffer_total_count != sp->buffer_target_count) { + pvr2_stream_achieve_buffer_count(sp); + } +} + +static void pvr2_stream_init(struct pvr2_stream *sp) +{ + spin_lock_init(&sp->list_lock); + mutex_init(&sp->mutex); + INIT_LIST_HEAD(&sp->queued_list); + INIT_LIST_HEAD(&sp->ready_list); + INIT_LIST_HEAD(&sp->idle_list); +} + +static void pvr2_stream_done(struct pvr2_stream *sp) +{ + mutex_lock(&sp->mutex); do { + pvr2_stream_internal_flush(sp); + pvr2_stream_buffer_count(sp,0); + } while (0); mutex_unlock(&sp->mutex); +} + +static void buffer_complete(struct urb *urb, struct pt_regs *regs) +{ + struct pvr2_buffer *bp = urb->context; + struct pvr2_stream *sp; + unsigned long irq_flags; + BUFFER_CHECK(bp); + sp = bp->stream; + bp->used_count = 0; + bp->status = 0; + pvr2_trace(PVR2_TRACE_BUF_FLOW, + "/*---TRACE_FLOW---*/ bufferComplete %p stat=%d cnt=%d", + bp,urb->status,urb->actual_length); + spin_lock_irqsave(&sp->list_lock,irq_flags); + if ((!(urb->status)) || + (urb->status == -ENOENT) || + (urb->status == -ECONNRESET) || + (urb->status == -ESHUTDOWN)) { + bp->used_count = urb->actual_length; + if (sp->fail_count) { + pvr2_trace(PVR2_TRACE_TOLERANCE, + "stream %p transfer ok" + " - fail count reset",sp); + sp->fail_count = 0; + } + } else if (sp->fail_count < sp->fail_tolerance) { + // We can tolerate this error, because we're below the + // threshold... + (sp->fail_count)++; + pvr2_trace(PVR2_TRACE_TOLERANCE, + "stream %p ignoring error %d" + " - fail count increased to %u", + sp,urb->status,sp->fail_count); + } else { + bp->status = urb->status; + } + spin_unlock_irqrestore(&sp->list_lock,irq_flags); + pvr2_buffer_set_ready(bp); + if (sp && sp->callback_func) { + sp->callback_func(sp->callback_data); + } +} + +struct pvr2_stream *pvr2_stream_create(void) +{ + struct pvr2_stream *sp; + sp = kmalloc(sizeof(*sp),GFP_KERNEL); + if (!sp) return sp; + memset(sp,0,sizeof(*sp)); + pvr2_trace(PVR2_TRACE_INIT,"pvr2_stream_create: sp=%p",sp); + pvr2_stream_init(sp); + return sp; +} + +void pvr2_stream_destroy(struct pvr2_stream *sp) +{ + if (!sp) return; + pvr2_trace(PVR2_TRACE_INIT,"pvr2_stream_destroy: sp=%p",sp); + pvr2_stream_done(sp); + kfree(sp); +} + +void pvr2_stream_setup(struct pvr2_stream *sp, + struct usb_device *dev, + int endpoint, + unsigned int tolerance) +{ + mutex_lock(&sp->mutex); do { + pvr2_stream_internal_flush(sp); + sp->dev = dev; + sp->endpoint = endpoint; + sp->fail_tolerance = tolerance; + } while(0); mutex_unlock(&sp->mutex); +} + +void pvr2_stream_set_callback(struct pvr2_stream *sp, + pvr2_stream_callback func, + void *data) +{ + unsigned long irq_flags; + mutex_lock(&sp->mutex); do { + spin_lock_irqsave(&sp->list_lock,irq_flags); + sp->callback_data = data; + sp->callback_func = func; + spin_unlock_irqrestore(&sp->list_lock,irq_flags); + } while(0); mutex_unlock(&sp->mutex); +} + +/* Query / set the nominal buffer count */ +int pvr2_stream_get_buffer_count(struct pvr2_stream *sp) +{ + return sp->buffer_target_count; +} + +int pvr2_stream_set_buffer_count(struct pvr2_stream *sp,unsigned int cnt) +{ + int ret; + if (sp->buffer_target_count == cnt) return 0; + mutex_lock(&sp->mutex); do { + sp->buffer_target_count = cnt; + ret = pvr2_stream_achieve_buffer_count(sp); + } while(0); mutex_unlock(&sp->mutex); + return ret; +} + +struct pvr2_buffer *pvr2_stream_get_idle_buffer(struct pvr2_stream *sp) +{ + struct list_head *lp = sp->idle_list.next; + if (lp == &sp->idle_list) return 0; + return list_entry(lp,struct pvr2_buffer,list_overhead); +} + +struct pvr2_buffer *pvr2_stream_get_ready_buffer(struct pvr2_stream *sp) +{ + struct list_head *lp = sp->ready_list.next; + if (lp == &sp->ready_list) return 0; + return list_entry(lp,struct pvr2_buffer,list_overhead); +} + +struct pvr2_buffer *pvr2_stream_get_buffer(struct pvr2_stream *sp,int id) +{ + if (id < 0) return 0; + if (id >= sp->buffer_total_count) return 0; + return sp->buffers[id]; +} + +int pvr2_stream_get_ready_count(struct pvr2_stream *sp) +{ + return sp->r_count; +} + +int pvr2_stream_get_idle_count(struct pvr2_stream *sp) +{ + return sp->i_count; +} + +void pvr2_stream_flush(struct pvr2_stream *sp) +{ + mutex_lock(&sp->mutex); do { + pvr2_stream_internal_flush(sp); + } while(0); mutex_unlock(&sp->mutex); +} + +void pvr2_stream_kill(struct pvr2_stream *sp) +{ + struct pvr2_buffer *bp; + mutex_lock(&sp->mutex); do { + pvr2_stream_internal_flush(sp); + while ((bp = pvr2_stream_get_ready_buffer(sp)) != 0) { + pvr2_buffer_set_idle(bp); + } + if (sp->buffer_total_count != sp->buffer_target_count) { + pvr2_stream_achieve_buffer_count(sp); + } + } while(0); mutex_unlock(&sp->mutex); +} + +int pvr2_buffer_queue(struct pvr2_buffer *bp) +{ +#undef SEED_BUFFER +#ifdef SEED_BUFFER + unsigned int idx; + unsigned int val; +#endif + int ret = 0; + struct pvr2_stream *sp; + if (!bp) return -EINVAL; + sp = bp->stream; + mutex_lock(&sp->mutex); do { + pvr2_buffer_wipe(bp); + if (!sp->dev) { + ret = -EIO; + break; + } + pvr2_buffer_set_queued(bp); +#ifdef SEED_BUFFER + for (idx = 0; idx < (bp->max_count) / 4; idx++) { + val = bp->id << 24; + val |= idx; + ((unsigned int *)(bp->ptr))[idx] = val; + } +#endif + bp->status = -EINPROGRESS; + usb_fill_bulk_urb(bp->purb, // struct urb *urb + sp->dev, // struct usb_device *dev + // endpoint (below) + usb_rcvbulkpipe(sp->dev,sp->endpoint), + bp->ptr, // void *transfer_buffer + bp->max_count, // int buffer_length + buffer_complete, + bp); + usb_submit_urb(bp->purb,GFP_KERNEL); + } while(0); mutex_unlock(&sp->mutex); + return ret; +} + +int pvr2_buffer_idle(struct pvr2_buffer *bp) +{ + struct pvr2_stream *sp; + if (!bp) return -EINVAL; + sp = bp->stream; + mutex_lock(&sp->mutex); do { + pvr2_buffer_wipe(bp); + pvr2_buffer_set_idle(bp); + if (sp->buffer_total_count != sp->buffer_target_count) { + pvr2_stream_achieve_buffer_count(sp); + } + } while(0); mutex_unlock(&sp->mutex); + return 0; +} + +int pvr2_buffer_set_buffer(struct pvr2_buffer *bp,void *ptr,unsigned int cnt) +{ + int ret = 0; + unsigned long irq_flags; + struct pvr2_stream *sp; + if (!bp) return -EINVAL; + sp = bp->stream; + mutex_lock(&sp->mutex); do { + spin_lock_irqsave(&sp->list_lock,irq_flags); + if (bp->state != pvr2_buffer_state_idle) { + ret = -EPERM; + } else { + bp->ptr = ptr; + bp->stream->i_bcount -= bp->max_count; + bp->max_count = cnt; + bp->stream->i_bcount += bp->max_count; + pvr2_trace(PVR2_TRACE_BUF_FLOW, + "/*---TRACE_FLOW---*/ bufferPool " + " %8s cap cap=%07d cnt=%02d", + pvr2_buffer_state_decode( + pvr2_buffer_state_idle), + bp->stream->i_bcount,bp->stream->i_count); + } + spin_unlock_irqrestore(&sp->list_lock,irq_flags); + } while(0); mutex_unlock(&sp->mutex); + return ret; +} + +unsigned int pvr2_buffer_get_count(struct pvr2_buffer *bp) +{ + return bp->used_count; +} + +int pvr2_buffer_get_status(struct pvr2_buffer *bp) +{ + return bp->status; +} + +enum pvr2_buffer_state pvr2_buffer_get_state(struct pvr2_buffer *bp) +{ + return bp->state; +} + +int pvr2_buffer_get_id(struct pvr2_buffer *bp) +{ + return bp->id; +} + + +/* + 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: *** + */ |