--- /dev/null
+#ifndef __USBAUDIO_CARD_H
+#define __USBAUDIO_CARD_H
+
+#define MAX_NR_RATES 1024
+#define MAX_PACKS 6 /* per URB */
+#define MAX_PACKS_HS (MAX_PACKS * 8) /* in high speed mode */
+#define MAX_URBS 12
+#define SYNC_URBS 4 /* always four urbs for sync */
+#define MAX_QUEUE 18 /* 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 char protocol; /* UAC_VERSION_1/2 */
+ 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 */
+ unsigned char clock; /* associated clock */
+ struct snd_pcm_chmap_elem *chmap; /* (optional) channel map */
+ bool dsd_dop; /* add DOP headers in case of DSD samples */
+ bool dsd_bitrev; /* reverse the bits of each DSD sample */
+};
+
+struct snd_usb_substream;
+struct snd_usb_endpoint;
+
+struct snd_urb_ctx {
+ struct urb *urb;
+ unsigned int buffer_size; /* size of data buffer, if data URB */
+ struct snd_usb_substream *subs;
+ struct snd_usb_endpoint *ep;
+ int index; /* index for urb array */
+ int packets; /* number of packets per urb */
+ int packet_size[MAX_PACKS_HS]; /* size of packets for next submission */
+ struct list_head ready_list;
+};
+
+struct snd_usb_endpoint {
+ struct snd_usb_audio *chip;
+
+ int use_count;
+ int ep_num; /* the referenced endpoint number */
+ int type; /* SND_USB_ENDPOINT_TYPE_* */
+ unsigned long flags;
+
+ void (*prepare_data_urb) (struct snd_usb_substream *subs,
+ struct urb *urb);
+ void (*retire_data_urb) (struct snd_usb_substream *subs,
+ struct urb *urb);
+
+ struct snd_usb_substream *data_subs;
+ struct snd_usb_endpoint *sync_master;
+ struct snd_usb_endpoint *sync_slave;
+
+ struct snd_urb_ctx urb[MAX_URBS];
+
+ struct snd_usb_packet_info {
+ uint32_t packet_size[MAX_PACKS_HS];
+ int packets;
+ } next_packet[MAX_URBS];
+ int next_packet_read_pos, next_packet_write_pos;
+ struct list_head ready_playback_urbs;
+
+ unsigned int nurbs; /* # urbs */
+ unsigned long active_mask; /* bitmask of active urbs */
+ unsigned long unlink_mask; /* bitmask of unlinked urbs */
+ char *syncbuf; /* sync buffer for all sync URBs */
+ dma_addr_t sync_dma; /* DMA address of syncbuf */
+
+ unsigned int pipe; /* the data i/o pipe */
+ 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 */
+ int freqshift; /* how much to shift the feedback value to get Q16.16 */
+ 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 max_urb_frames; /* max URB 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 syncmaxsize; /* sync endpoint packet size */
+ unsigned int fill_max:1; /* fill max packet size always */
+ unsigned int udh01_fb_quirk:1; /* corrupted feedback data */
+ unsigned int datainterval; /* log_2 of data packet interval */
+ unsigned int syncinterval; /* P for adaptive mode, 0 otherwise */
+ unsigned char silence_value;
+ unsigned int stride;
+ int iface, altsetting;
+ int skip_packets; /* quirks for devices to ignore the first n packets
+ in a stream */
+
+ spinlock_t lock;
+ struct list_head list;
+};
+
+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) */
+ snd_pcm_format_t pcm_format; /* current audio format (for hw_params callback) */
+ unsigned int channels; /* current number of channels (for hw_params callback) */
+ unsigned int channels_max; /* max channels in the all audiofmts */
+ unsigned int cur_rate; /* current rate (for hw_params callback) */
+ unsigned int period_bytes; /* current period bytes (for hw_params callback) */
+ unsigned int period_frames; /* current frames per period */
+ unsigned int buffer_periods; /* current periods per buffer */
+ unsigned int altset_idx; /* USB data format: index of alternate setting */
+ unsigned int txfr_quirk:1; /* allow sub-frame alignment */
+ unsigned int fmt_type; /* USB audio format type (1-3) */
+ unsigned int pkt_offset_adj; /* Bytes to drop from beginning of packets (for non-compliant devices) */
+
+ 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 int frame_limit; /* limits number of packets in URB */
+
+ /* data and sync endpoints for this stream */
+ unsigned int ep_num; /* the endpoint number */
+ struct snd_usb_endpoint *data_endpoint;
+ struct snd_usb_endpoint *sync_endpoint;
+ unsigned long flags;
+ bool need_setup_ep; /* (re)configure EP at prepare? */
+ unsigned int speed; /* USB_SPEED_XXX */
+
+ 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;
+
+ int last_frame_number; /* stored frame number */
+ int last_delay; /* stored delay */
+
+ struct {
+ int marker;
+ int channel;
+ int byte_idx;
+ } dsd_dop;
+
+ bool trigger_tstamp_pending_update; /* trigger timestamp being updated from initial estimate */
+};
+
+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 */
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