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TOMOYO Linux Cross Reference
Linux/sound/usb/card.h

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  1 #ifndef __USBAUDIO_CARD_H
  2 #define __USBAUDIO_CARD_H
  3 
  4 #define MAX_NR_RATES    1024
  5 #define MAX_PACKS       6               /* per URB */
  6 #define MAX_PACKS_HS    (MAX_PACKS * 8) /* in high speed mode */
  7 #define MAX_URBS        12
  8 #define SYNC_URBS       4       /* always four urbs for sync */
  9 #define MAX_QUEUE       18      /* try not to exceed this queue length, in ms */
 10 
 11 struct audioformat {
 12         struct list_head list;
 13         u64 formats;                    /* ALSA format bits */
 14         unsigned int channels;          /* # channels */
 15         unsigned int fmt_type;          /* USB audio format type (1-3) */
 16         unsigned int frame_size;        /* samples per frame for non-audio */
 17         int iface;                      /* interface number */
 18         unsigned char altsetting;       /* corresponding alternate setting */
 19         unsigned char altset_idx;       /* array index of altenate setting */
 20         unsigned char attributes;       /* corresponding attributes of cs endpoint */
 21         unsigned char endpoint;         /* endpoint */
 22         unsigned char ep_attr;          /* endpoint attributes */
 23         unsigned char datainterval;     /* log_2 of data packet interval */
 24         unsigned char protocol;         /* UAC_VERSION_1/2 */
 25         unsigned int maxpacksize;       /* max. packet size */
 26         unsigned int rates;             /* rate bitmasks */
 27         unsigned int rate_min, rate_max;        /* min/max rates */
 28         unsigned int nr_rates;          /* number of rate table entries */
 29         unsigned int *rate_table;       /* rate table */
 30         unsigned char clock;            /* associated clock */
 31         struct snd_pcm_chmap_elem *chmap; /* (optional) channel map */
 32         bool dsd_dop;                   /* add DOP headers in case of DSD samples */
 33         bool dsd_bitrev;                /* reverse the bits of each DSD sample */
 34 };
 35 
 36 struct snd_usb_substream;
 37 struct snd_usb_endpoint;
 38 
 39 struct snd_urb_ctx {
 40         struct urb *urb;
 41         unsigned int buffer_size;       /* size of data buffer, if data URB */
 42         struct snd_usb_substream *subs;
 43         struct snd_usb_endpoint *ep;
 44         int index;      /* index for urb array */
 45         int packets;    /* number of packets per urb */
 46         int packet_size[MAX_PACKS_HS]; /* size of packets for next submission */
 47         struct list_head ready_list;
 48 };
 49 
 50 struct snd_usb_endpoint {
 51         struct snd_usb_audio *chip;
 52 
 53         int use_count;
 54         int ep_num;             /* the referenced endpoint number */
 55         int type;               /* SND_USB_ENDPOINT_TYPE_* */
 56         unsigned long flags;
 57 
 58         void (*prepare_data_urb) (struct snd_usb_substream *subs,
 59                                   struct urb *urb);
 60         void (*retire_data_urb) (struct snd_usb_substream *subs,
 61                                  struct urb *urb);
 62 
 63         struct snd_usb_substream *data_subs;
 64         struct snd_usb_endpoint *sync_master;
 65         struct snd_usb_endpoint *sync_slave;
 66 
 67         struct snd_urb_ctx urb[MAX_URBS];
 68 
 69         struct snd_usb_packet_info {
 70                 uint32_t packet_size[MAX_PACKS_HS];
 71                 int packets;
 72         } next_packet[MAX_URBS];
 73         int next_packet_read_pos, next_packet_write_pos;
 74         struct list_head ready_playback_urbs;
 75 
 76         unsigned int nurbs;             /* # urbs */
 77         unsigned long active_mask;      /* bitmask of active urbs */
 78         unsigned long unlink_mask;      /* bitmask of unlinked urbs */
 79         char *syncbuf;                  /* sync buffer for all sync URBs */
 80         dma_addr_t sync_dma;            /* DMA address of syncbuf */
 81 
 82         unsigned int pipe;              /* the data i/o pipe */
 83         unsigned int freqn;             /* nominal sampling rate in fs/fps in Q16.16 format */
 84         unsigned int freqm;             /* momentary sampling rate in fs/fps in Q16.16 format */
 85         int        freqshift;           /* how much to shift the feedback value to get Q16.16 */
 86         unsigned int freqmax;           /* maximum sampling rate, used for buffer management */
 87         unsigned int phase;             /* phase accumulator */
 88         unsigned int maxpacksize;       /* max packet size in bytes */
 89         unsigned int maxframesize;      /* max packet size in frames */
 90         unsigned int max_urb_frames;    /* max URB size in frames */
 91         unsigned int curpacksize;       /* current packet size in bytes (for capture) */
 92         unsigned int curframesize;      /* current packet size in frames (for capture) */
 93         unsigned int syncmaxsize;       /* sync endpoint packet size */
 94         unsigned int fill_max:1;        /* fill max packet size always */
 95         unsigned int tenor_fb_quirk:1;  /* corrupted feedback data */
 96         unsigned int datainterval;      /* log_2 of data packet interval */
 97         unsigned int syncinterval;      /* P for adaptive mode, 0 otherwise */
 98         unsigned char silence_value;
 99         unsigned int stride;
100         int iface, altsetting;
101         int skip_packets;               /* quirks for devices to ignore the first n packets
102                                            in a stream */
103 
104         spinlock_t lock;
105         struct list_head list;
106 };
107 
108 struct snd_usb_substream {
109         struct snd_usb_stream *stream;
110         struct usb_device *dev;
111         struct snd_pcm_substream *pcm_substream;
112         int direction;  /* playback or capture */
113         int interface;  /* current interface */
114         int endpoint;   /* assigned endpoint */
115         struct audioformat *cur_audiofmt;       /* current audioformat pointer (for hw_params callback) */
116         snd_pcm_format_t pcm_format;    /* current audio format (for hw_params callback) */
117         unsigned int channels;          /* current number of channels (for hw_params callback) */
118         unsigned int channels_max;      /* max channels in the all audiofmts */
119         unsigned int cur_rate;          /* current rate (for hw_params callback) */
120         unsigned int period_bytes;      /* current period bytes (for hw_params callback) */
121         unsigned int period_frames;     /* current frames per period */
122         unsigned int buffer_periods;    /* current periods per buffer */
123         unsigned int altset_idx;     /* USB data format: index of alternate setting */
124         unsigned int txfr_quirk:1;      /* allow sub-frame alignment */
125         unsigned int tx_length_quirk:1; /* add length specifier to transfers */
126         unsigned int fmt_type;          /* USB audio format type (1-3) */
127         unsigned int pkt_offset_adj;    /* Bytes to drop from beginning of packets (for non-compliant devices) */
128 
129         unsigned int running: 1;        /* running status */
130 
131         unsigned int hwptr_done;        /* processed byte position in the buffer */
132         unsigned int transfer_done;             /* processed frames since last period update */
133         unsigned int frame_limit;       /* limits number of packets in URB */
134 
135         /* data and sync endpoints for this stream */
136         unsigned int ep_num;            /* the endpoint number */
137         struct snd_usb_endpoint *data_endpoint;
138         struct snd_usb_endpoint *sync_endpoint;
139         unsigned long flags;
140         bool need_setup_ep;             /* (re)configure EP at prepare? */
141         unsigned int speed;             /* USB_SPEED_XXX */
142 
143         u64 formats;                    /* format bitmasks (all or'ed) */
144         unsigned int num_formats;               /* number of supported audio formats (list) */
145         struct list_head fmt_list;      /* format list */
146         struct snd_pcm_hw_constraint_list rate_list;    /* limited rates */
147         spinlock_t lock;
148 
149         int last_frame_number;          /* stored frame number */
150         int last_delay;                 /* stored delay */
151 
152         struct {
153                 int marker;
154                 int channel;
155                 int byte_idx;
156         } dsd_dop;
157 
158         bool trigger_tstamp_pending_update; /* trigger timestamp being updated from initial estimate */
159 };
160 
161 struct snd_usb_stream {
162         struct snd_usb_audio *chip;
163         struct snd_pcm *pcm;
164         int pcm_index;
165         unsigned int fmt_type;          /* USB audio format type (1-3) */
166         struct snd_usb_substream substream[2];
167         struct list_head list;
168 };
169 
170 #endif /* __USBAUDIO_CARD_H */
171 

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