1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * 4 * Copyright (C) 2005 Mike Isely <isely@pobox.com> 5 */ 6 #ifndef __PVRUSB2_IO_H 7 #define __PVRUSB2_IO_H 8 9 #include <linux/usb.h> 10 #include <linux/list.h> 11 12 typedef void (*pvr2_stream_callback)(void *); 13 14 enum pvr2_buffer_state { 15 pvr2_buffer_state_none = 0, // Not on any list 16 pvr2_buffer_state_idle = 1, // Buffer is ready to be used again 17 pvr2_buffer_state_queued = 2, // Buffer has been queued for filling 18 pvr2_buffer_state_ready = 3, // Buffer has data available 19 }; 20 21 struct pvr2_stream; 22 struct pvr2_buffer; 23 24 struct pvr2_stream_stats { 25 unsigned int buffers_in_queue; 26 unsigned int buffers_in_idle; 27 unsigned int buffers_in_ready; 28 unsigned int buffers_processed; 29 unsigned int buffers_failed; 30 unsigned int bytes_processed; 31 }; 32 33 /* Initialize / tear down stream structure */ 34 struct pvr2_stream *pvr2_stream_create(void); 35 void pvr2_stream_destroy(struct pvr2_stream *); 36 void pvr2_stream_setup(struct pvr2_stream *, 37 struct usb_device *dev,int endpoint, 38 unsigned int tolerance); 39 void pvr2_stream_set_callback(struct pvr2_stream *, 40 pvr2_stream_callback func, 41 void *data); 42 void pvr2_stream_get_stats(struct pvr2_stream *, 43 struct pvr2_stream_stats *, 44 int zero_counts); 45 46 /* Query / set the nominal buffer count */ 47 int pvr2_stream_get_buffer_count(struct pvr2_stream *); 48 int pvr2_stream_set_buffer_count(struct pvr2_stream *,unsigned int); 49 50 /* Get a pointer to a buffer that is either idle, ready, or is specified 51 named. */ 52 struct pvr2_buffer *pvr2_stream_get_idle_buffer(struct pvr2_stream *); 53 struct pvr2_buffer *pvr2_stream_get_ready_buffer(struct pvr2_stream *); 54 struct pvr2_buffer *pvr2_stream_get_buffer(struct pvr2_stream *sp,int id); 55 56 /* Find out how many buffers are idle or ready */ 57 int pvr2_stream_get_ready_count(struct pvr2_stream *); 58 59 60 /* Kill all pending buffers and throw away any ready buffers as well */ 61 void pvr2_stream_kill(struct pvr2_stream *); 62 63 /* Set up the actual storage for a buffer */ 64 int pvr2_buffer_set_buffer(struct pvr2_buffer *,void *ptr,unsigned int cnt); 65 66 /* Find out size of data in the given ready buffer */ 67 unsigned int pvr2_buffer_get_count(struct pvr2_buffer *); 68 69 /* Retrieve completion code for given ready buffer */ 70 int pvr2_buffer_get_status(struct pvr2_buffer *); 71 72 /* Retrieve ID of given buffer */ 73 int pvr2_buffer_get_id(struct pvr2_buffer *); 74 75 /* Start reading into given buffer (kill it if needed) */ 76 int pvr2_buffer_queue(struct pvr2_buffer *); 77 78 #endif /* __PVRUSB2_IO_H */ 79