xref: /openbmc/linux/sound/x86/intel_hdmi_audio.h (revision 9659281c)
1 /*
2  * Copyright (C) 2016 Intel Corporation
3  *  Authors:	Sailaja Bandarupalli <sailaja.bandarupalli@intel.com>
4  *		Ramesh Babu K V	<ramesh.babu@intel.com>
5  *		Vaibhav Agarwal <vaibhav.agarwal@intel.com>
6  *		Jerome Anand <jerome.anand@intel.com>
7  *
8  * Permission is hereby granted, free of charge, to any person obtaining
9  * a copy of this software and associated documentation files
10  * (the "Software"), to deal in the Software without restriction,
11  * including without limitation the rights to use, copy, modify, merge,
12  * publish, distribute, sublicense, and/or sell copies of the Software,
13  * and to permit persons to whom the Software is furnished to do so,
14  * subject to the following conditions:
15  *
16  * The above copyright notice and this permission notice (including the
17  * next paragraph) shall be included in all copies or substantial
18  * portions of the Software.
19  *
20  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
21  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
22  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
23  * NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
24  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
25  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
26  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
27  * SOFTWARE.
28  */
29 
30 #ifndef _INTEL_HDMI_AUDIO_H_
31 #define _INTEL_HDMI_AUDIO_H_
32 
33 #include "intel_hdmi_lpe_audio.h"
34 
35 #define MAX_PB_STREAMS		1
36 #define MAX_CAP_STREAMS		0
37 #define BYTES_PER_WORD		0x4
38 #define INTEL_HAD		"HdmiLpeAudio"
39 
40 /*
41  *	CEA speaker placement:
42  *
43  *	FL  FLC   FC   FRC   FR
44  *
45  *						LFE
46  *
47  *	RL  RLC   RC   RRC   RR
48  *
49  *	The Left/Right Surround channel _notions_ LS/RS in SMPTE 320M
50  *	corresponds to CEA RL/RR; The SMPTE channel _assignment_ C/LFE is
51  *	swapped to CEA LFE/FC.
52  */
53 enum cea_speaker_placement {
54 	FL  = (1 <<  0),        /* Front Left           */
55 	FC  = (1 <<  1),        /* Front Center         */
56 	FR  = (1 <<  2),        /* Front Right          */
57 	FLC = (1 <<  3),        /* Front Left Center    */
58 	FRC = (1 <<  4),        /* Front Right Center   */
59 	RL  = (1 <<  5),        /* Rear Left            */
60 	RC  = (1 <<  6),        /* Rear Center          */
61 	RR  = (1 <<  7),        /* Rear Right           */
62 	RLC = (1 <<  8),        /* Rear Left Center     */
63 	RRC = (1 <<  9),        /* Rear Right Center    */
64 	LFE = (1 << 10),        /* Low Frequency Effect */
65 };
66 
67 struct cea_channel_speaker_allocation {
68 	int ca_index;
69 	int speakers[8];
70 
71 	/* derived values, just for convenience */
72 	int channels;
73 	int spk_mask;
74 };
75 
76 struct channel_map_table {
77 	unsigned char map;              /* ALSA API channel map position */
78 	unsigned char cea_slot;         /* CEA slot value */
79 	int spk_mask;                   /* speaker position bit mask */
80 };
81 
82 struct pcm_stream_info {
83 	struct snd_pcm_substream *substream;
84 	int substream_refcount;
85 };
86 
87 /*
88  * struct snd_intelhad - intelhad driver structure
89  *
90  * @card: ptr to hold card details
91  * @connected: the monitor connection status
92  * @stream_info: stream information
93  * @eld: holds ELD info
94  * @curr_buf: pointer to hold current active ring buf
95  * @valid_buf_cnt: ring buffer count for stream
96  * @had_spinlock: driver lock
97  * @aes_bits: IEC958 status bits
98  * @buff_done: id of current buffer done intr
99  * @dev: platform device handle
100  * @chmap: holds channel map info
101  */
102 struct snd_intelhad {
103 	struct snd_intelhad_card *card_ctx;
104 	bool		connected;
105 	struct		pcm_stream_info stream_info;
106 	unsigned char	eld[HDMI_MAX_ELD_BYTES];
107 	bool dp_output;
108 	unsigned int	aes_bits;
109 	spinlock_t had_spinlock;
110 	struct device *dev;
111 	struct snd_pcm_chmap *chmap;
112 	int tmds_clock_speed;
113 	int link_rate;
114 	int port; /* fixed */
115 	int pipe; /* can change dynamically */
116 
117 	/* ring buffer (BD) position index */
118 	unsigned int bd_head;
119 	/* PCM buffer position indices */
120 	unsigned int pcmbuf_head;	/* being processed */
121 	unsigned int pcmbuf_filled;	/* to be filled */
122 
123 	unsigned int num_bds;		/* number of BDs */
124 	unsigned int period_bytes;	/* PCM period size in bytes */
125 
126 	/* internal stuff */
127 	union aud_cfg aud_config;	/* AUD_CONFIG reg value cache */
128 	struct work_struct hdmi_audio_wq;
129 	struct mutex mutex; /* for protecting chmap and eld */
130 	bool need_reset;
131 	struct snd_jack *jack;
132 };
133 
134 struct snd_intelhad_card {
135 	struct snd_card	*card;
136 	struct device *dev;
137 
138 	/* internal stuff */
139 	int irq;
140 	void __iomem *mmio_start;
141 	int num_pipes;
142 	int num_ports;
143 	struct snd_intelhad pcm_ctx[3]; /* one for each port */
144 };
145 
146 #endif /* _INTEL_HDMI_AUDIO_ */
147