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usb
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u_uac1.h

u_uac1.h 1.9 KB
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  1. /*
    2. 

  2.  * u_uac1.h -- interface to USB gadget "ALSA AUDIO" utilities
    3. 

  3.  *
    4. 

  4.  * Copyright (C) 2008 Bryan Wu <cooloney@kernel.org>
    5. 

  5.  * Copyright (C) 2008 Analog Devices, Inc
    6. 

  6.  *
    7. 

  7.  * Enter bugs at http://blackfin.uclinux.org/
    8. 

  8.  *
    9. 

  9.  * Licensed under the GPL-2 or later.
    10. 

  10.  */
    11. 

  11. 

  12. #ifndef __U_AUDIO_H
    13. 

  13. #define __U_AUDIO_H
    14. 

  14. 

  15. #include <linux/device.h>
    16. 

  16. #include <linux/err.h>
    17. 

  17. #include <linux/usb/audio.h>
    18. 

  18. #include <linux/usb/composite.h>
    19. 

  19. 

  20. #include <sound/core.h>
    21. 

  21. #include <sound/pcm.h>
    22. 

  22. #include <sound/pcm_params.h>
    23. 

  23. 

  24. #include "gadget_chips.h"
    25. 

  25. 

  26. #define FILE_PCM_PLAYBACK	"/dev/snd/pcmC0D0p"
    27. 

  27. #define FILE_PCM_CAPTURE	"/dev/snd/pcmC0D0c"
    28. 

  28. #define FILE_CONTROL		"/dev/snd/controlC0"
    29. 

  29. 

  30. #define UAC1_OUT_EP_MAX_PACKET_SIZE	200
    31. 

  31. #define UAC1_REQ_COUNT			256
    32. 

  32. #define UAC1_AUDIO_BUF_SIZE		48000
    33. 

  33. 

  34. /*
    35. 

  35.  * This represents the USB side of an audio card device, managed by a USB
    36. 

  36.  * function which provides control and stream interfaces.
    37. 

  37.  */
    38. 

  38. 

  39. struct gaudio_snd_dev {
    40. 

  40. 	struct gaudio			*card;
    41. 

  41. 	struct file			*filp;
    42. 

  42. 	struct snd_pcm_substream	*substream;
    43. 

  43. 	int				access;
    44. 

  44. 	int				format;
    45. 

  45. 	int				channels;
    46. 

  46. 	int				rate;
    47. 

  47. };
    48. 

  48. 

  49. struct gaudio {
    50. 

  50. 	struct usb_function		func;
    51. 

  51. 	struct usb_gadget		*gadget;
    52. 

  52. 

  53. 	/* ALSA sound device interfaces */
    54. 

  54. 	struct gaudio_snd_dev		control;
    55. 

  55. 	struct gaudio_snd_dev		playback;
    56. 

  56. 	struct gaudio_snd_dev		capture;
    57. 

  57. 

  58. 	/* TODO */
    59. 

  59. };
    60. 

  60. 

  61. struct f_uac1_opts {
    62. 

  62. 	struct usb_function_instance	func_inst;
    63. 

  63. 	int				req_buf_size;
    64. 

  64. 	int				req_count;
    65. 

  65. 	int				audio_buf_size;
    66. 

  66. 	char				*fn_play;
    67. 

  67. 	char				*fn_cap;
    68. 

  68. 	char				*fn_cntl;
    69. 

  69. 	unsigned			bound:1;
    70. 

  70. 	unsigned			fn_play_alloc:1;
    71. 

  71. 	unsigned			fn_cap_alloc:1;
    72. 

  72. 	unsigned			fn_cntl_alloc:1;
    73. 

  73. 	struct mutex			lock;
    74. 

  74. 	int				refcnt;
    75. 

  75. };
    76. 

  76. 

  77. int gaudio_setup(struct gaudio *card);
    78. 

  78. void gaudio_cleanup(struct gaudio *the_card);
    79. 

  79. 

  80. size_t u_audio_playback(struct gaudio *card, void *buf, size_t count);
    81. 

  81. int u_audio_get_playback_channels(struct gaudio *card);
    82. 

  82. int u_audio_get_playback_rate(struct gaudio *card);
    83. 

  83. 

  84. #endif /* __U_AUDIO_H */
    85.