diff options
Diffstat (limited to 'firmware/drivers')
-rw-r--r-- | firmware/drivers/audio/pcm1792.c | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/firmware/drivers/audio/pcm1792.c b/firmware/drivers/audio/pcm1792.c new file mode 100644 index 0000000000..67237a920a --- /dev/null +++ b/firmware/drivers/audio/pcm1792.c | |||
@@ -0,0 +1,133 @@ | |||
1 | /*************************************************************************** | ||
2 | * __________ __ ___. | ||
3 | * Open \______ \ ____ ____ | | _\_ |__ _______ ___ | ||
4 | * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / | ||
5 | * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < | ||
6 | * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ | ||
7 | * \/ \/ \/ \/ \/ | ||
8 | * $Id$ | ||
9 | * | ||
10 | * Copyright (C) 2013 Andrew Ryabinin | ||
11 | * | ||
12 | * This program is free software; you can redistribute it and/or | ||
13 | * modify it under the terms of the GNU General Public License | ||
14 | * as published by the Free Software Foundation; either version 2 | ||
15 | * of the License, or (at your option) any later version. | ||
16 | * | ||
17 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY | ||
18 | * KIND, either express or implied. | ||
19 | * | ||
20 | ****************************************************************************/ | ||
21 | |||
22 | #include "system.h" | ||
23 | #include "pcm1792.h" | ||
24 | #include "config.h" | ||
25 | #include "audio.h" | ||
26 | #include "audiohw.h" | ||
27 | |||
28 | /* pcm1792 registers initial values */ | ||
29 | #define REG18_INIT_VALUE (PCM1792_ATLD_OFF|PCM1792_FMT_16_I2S| \ | ||
30 | PCM1792_DMF_DISABLE|PCM1792_DME_OFF) | ||
31 | |||
32 | #define REG19_INIT_VALUE (PCM1792_REV_ON|PCM1792_ATS_DIV1| \ | ||
33 | PCM1792_OPE_ON|PCM1792_DFMS_MONO| \ | ||
34 | PCM1792_FLT_SHARP|PCM1792_INZD_OFF) | ||
35 | |||
36 | #define REG20_INIT_VALUE (PCM1792_SRST_NORMAL|PCM1792_DSD_OFF|\ | ||
37 | PCM1792_DFTH_ENABLE|PCM1792_STEREO|\ | ||
38 | PCM1792_OS_64) | ||
39 | |||
40 | #define REG21_INIT_VALUE (PCM1792_DZ_DISABLE|PCM1792_PCMZ_ON) | ||
41 | |||
42 | |||
43 | static void pcm1792_write_reg(const int reg, const unsigned int value) | ||
44 | { | ||
45 | int i; | ||
46 | |||
47 | pcm1792_set_ml_dir(0); | ||
48 | pcm1792_set_md(1); | ||
49 | pcm1792_set_mc(0); | ||
50 | pcm1792_set_ml(0); | ||
51 | |||
52 | for (i = (1<<15); i; i >>= 1) { | ||
53 | udelay(40); | ||
54 | pcm1792_set_mc(0); | ||
55 | |||
56 | if ((reg|value) & i) { | ||
57 | pcm1792_set_md(1); | ||
58 | } else { | ||
59 | pcm1792_set_md(0); | ||
60 | } | ||
61 | |||
62 | udelay(40); | ||
63 | pcm1792_set_mc(1); | ||
64 | } | ||
65 | |||
66 | udelay(40); | ||
67 | pcm1792_set_ml(1); | ||
68 | pcm1792_set_mc(0); | ||
69 | udelay(130); | ||
70 | pcm1792_set_md(1); | ||
71 | } | ||
72 | |||
73 | static int vol_tenthdb2hw(const int tdb) | ||
74 | { | ||
75 | if (tdb < PCM1792_VOLUME_MIN) { | ||
76 | return 0; | ||
77 | } else if (tdb > PCM1792_VOLUME_MAX) { | ||
78 | return 0xff; | ||
79 | } else { | ||
80 | return (tdb/5+0xff); | ||
81 | } | ||
82 | } | ||
83 | |||
84 | |||
85 | void audiohw_init(void) | ||
86 | { | ||
87 | pcm1792_write_reg(PCM1792_REG(18), REG18_INIT_VALUE); | ||
88 | pcm1792_write_reg(PCM1792_REG(19), REG19_INIT_VALUE); | ||
89 | pcm1792_write_reg(PCM1792_REG(20), REG20_INIT_VALUE); | ||
90 | pcm1792_write_reg(PCM1792_REG(21), REG21_INIT_VALUE); | ||
91 | |||
92 | /* Left & Right volumes */ | ||
93 | pcm1792_write_reg(PCM1792_REG(16), 0xff); | ||
94 | pcm1792_write_reg(PCM1792_REG(17), 0xff); | ||
95 | } | ||
96 | |||
97 | void audiohw_mute(void) | ||
98 | { | ||
99 | pcm1792_write_reg(PCM1792_REG(18), REG18_INIT_VALUE|PCM1792_MUTE_ON); | ||
100 | } | ||
101 | |||
102 | void audiohw_unmute(void) | ||
103 | { | ||
104 | pcm1792_write_reg(PCM1792_REG(18), REG18_INIT_VALUE); | ||
105 | } | ||
106 | |||
107 | void audiohw_preinit(void) | ||
108 | { | ||
109 | } | ||
110 | |||
111 | void audiohw_set_frequency(int fsel) | ||
112 | { | ||
113 | (void)fsel; | ||
114 | } | ||
115 | |||
116 | void audiohw_set_volume(int vol_l, int vol_r) | ||
117 | { | ||
118 | pcm1792_write_reg(PCM1792_REG(16), vol_tenthdb2hw(vol_l)); | ||
119 | pcm1792_write_reg(PCM1792_REG(17), vol_tenthdb2hw(vol_r)); | ||
120 | } | ||
121 | |||
122 | void audiohw_set_filter_roll_off(int value) | ||
123 | { | ||
124 | if (value == 0) { | ||
125 | pcm1792_write_reg(PCM1792_REG(19), | ||
126 | REG19_INIT_VALUE | ||
127 | |PCM1792_FLT_SHARP); | ||
128 | } else { | ||
129 | pcm1792_write_reg(PCM1792_REG(19), | ||
130 | REG19_INIT_VALUE | ||
131 | |PCM1792_FLT_SLOW); | ||
132 | } | ||
133 | } | ||