summaryrefslogtreecommitdiffstats
path: root/sound/usb/card.h
diff options
context:
space:
mode:
Diffstat (limited to 'sound/usb/card.h')
-rw-r--r--sound/usb/card.h105
1 files changed, 105 insertions, 0 deletions
diff --git a/sound/usb/card.h b/sound/usb/card.h
new file mode 100644
index 000000000000..ed92420c1095
--- /dev/null
+++ b/sound/usb/card.h
@@ -0,0 +1,105 @@
+#ifndef __USBAUDIO_CARD_H
+#define __USBAUDIO_CARD_H
+
+#define MAX_PACKS 20
+#define MAX_PACKS_HS (MAX_PACKS * 8) /* in high speed mode */
+#define MAX_URBS 8
+#define SYNC_URBS 4 /* always four urbs for sync */
+#define MAX_QUEUE 24 /* try not to exceed this queue length, in ms */
+
+struct audioformat {
+ struct list_head list;
+ u64 formats; /* ALSA format bits */
+ unsigned int channels; /* # channels */
+ unsigned int fmt_type; /* USB audio format type (1-3) */
+ unsigned int frame_size; /* samples per frame for non-audio */
+ int iface; /* interface number */
+ unsigned char altsetting; /* corresponding alternate setting */
+ unsigned char altset_idx; /* array index of altenate setting */
+ unsigned char attributes; /* corresponding attributes of cs endpoint */
+ unsigned char endpoint; /* endpoint */
+ unsigned char ep_attr; /* endpoint attributes */
+ unsigned char datainterval; /* log_2 of data packet interval */
+ unsigned int maxpacksize; /* max. packet size */
+ unsigned int rates; /* rate bitmasks */
+ unsigned int rate_min, rate_max; /* min/max rates */
+ unsigned int nr_rates; /* number of rate table entries */
+ unsigned int *rate_table; /* rate table */
+};
+
+struct snd_usb_substream;
+
+struct snd_urb_ctx {
+ struct urb *urb;
+ unsigned int buffer_size; /* size of data buffer, if data URB */
+ struct snd_usb_substream *subs;
+ int index; /* index for urb array */
+ int packets; /* number of packets per urb */
+};
+
+struct snd_urb_ops {
+ int (*prepare)(struct snd_usb_substream *subs, struct snd_pcm_runtime *runtime, struct urb *u);
+ int (*retire)(struct snd_usb_substream *subs, struct snd_pcm_runtime *runtime, struct urb *u);
+ int (*prepare_sync)(struct snd_usb_substream *subs, struct snd_pcm_runtime *runtime, struct urb *u);
+ int (*retire_sync)(struct snd_usb_substream *subs, struct snd_pcm_runtime *runtime, struct urb *u);
+};
+
+struct snd_usb_substream {
+ struct snd_usb_stream *stream;
+ struct usb_device *dev;
+ struct snd_pcm_substream *pcm_substream;
+ int direction; /* playback or capture */
+ int interface; /* current interface */
+ int endpoint; /* assigned endpoint */
+ struct audioformat *cur_audiofmt; /* current audioformat pointer (for hw_params callback) */
+ unsigned int cur_rate; /* current rate (for hw_params callback) */
+ unsigned int period_bytes; /* current period bytes (for hw_params callback) */
+ unsigned int altset_idx; /* USB data format: index of alternate setting */
+ unsigned int datapipe; /* the data i/o pipe */
+ unsigned int syncpipe; /* 1 - async out or adaptive in */
+ unsigned int datainterval; /* log_2 of data packet interval */
+ unsigned int syncinterval; /* P for adaptive mode, 0 otherwise */
+ unsigned int freqn; /* nominal sampling rate in fs/fps in Q16.16 format */
+ unsigned int freqm; /* momentary sampling rate in fs/fps in Q16.16 format */
+ unsigned int freqmax; /* maximum sampling rate, used for buffer management */
+ unsigned int phase; /* phase accumulator */
+ unsigned int maxpacksize; /* max packet size in bytes */
+ unsigned int maxframesize; /* max packet size in frames */
+ unsigned int curpacksize; /* current packet size in bytes (for capture) */
+ unsigned int curframesize; /* current packet size in frames (for capture) */
+ unsigned int fill_max: 1; /* fill max packet size always */
+ unsigned int txfr_quirk:1; /* allow sub-frame alignment */
+ unsigned int fmt_type; /* USB audio format type (1-3) */
+
+ unsigned int running: 1; /* running status */
+
+ unsigned int hwptr_done; /* processed byte position in the buffer */
+ unsigned int transfer_done; /* processed frames since last period update */
+ unsigned long active_mask; /* bitmask of active urbs */
+ unsigned long unlink_mask; /* bitmask of unlinked urbs */
+
+ unsigned int nurbs; /* # urbs */
+ struct snd_urb_ctx dataurb[MAX_URBS]; /* data urb table */
+ struct snd_urb_ctx syncurb[SYNC_URBS]; /* sync urb table */
+ char *syncbuf; /* sync buffer for all sync URBs */
+ dma_addr_t sync_dma; /* DMA address of syncbuf */
+
+ u64 formats; /* format bitmasks (all or'ed) */
+ unsigned int num_formats; /* number of supported audio formats (list) */
+ struct list_head fmt_list; /* format list */
+ struct snd_pcm_hw_constraint_list rate_list; /* limited rates */
+ spinlock_t lock;
+
+ struct snd_urb_ops ops; /* callbacks (must be filled at init) */
+};
+
+struct snd_usb_stream {
+ struct snd_usb_audio *chip;
+ struct snd_pcm *pcm;
+ int pcm_index;
+ unsigned int fmt_type; /* USB audio format type (1-3) */
+ struct snd_usb_substream substream[2];
+ struct list_head list;
+};
+
+#endif /* __USBAUDIO_CARD_H */