1 =================================
2 Notes on Maya44 USB Audio Support
3 =================================
4
5 .. note::
6 The following is the original document of R
7 current maya44 code based on. Some content
8 keep here as reference -- tiwai
9
10 Feb 14, 2008
11
12 Rainer Zimmermann <mail@lightshed.de>
13
14 STATE OF DEVELOPMENT
15 ====================
16
17 This driver is being developed on the initiati
18 Development is carried out by Rainer Zimmerman
19
20 ESI provided a sample Maya44 card for the deve
21
22 However, unfortunately it has turned out diffi
23
24 This is the first testing version of the Maya4
25
26
27 The following functions work, as tested by Rai
28
29 - playback and capture at all sampling rates
30 - input/output level
31 - crossmixing
32 - line/mic switch
33 - phantom power switch
34 - analogue monitor a.k.a bypass
35
36
37 The following functions *should* work, but are
38
39 - Channel 3+4 analogue - S/PDIF input switchin
40 - S/PDIF output
41 - all inputs/outputs on the M/IO/DIO extension
42 - internal/external clock selection
43
44
45 *In particular, we would appreciate testing of
46
47
48 Things that do not seem to work:
49
50 - The level meters ("multi track") in 'alsamix
51
52 - Ardour 2.1 seems to work only via JACK, not
53
54
55 DRIVER DETAILS
56 ==============
57
58 the following files were added:
59
60 * pci/ice1724/maya44.c - Maya44 specific code
61 * pci/ice1724/maya44.h
62 * pci/ice1724/ice1724.patch
63 * pci/ice1724/ice1724.h.patch - PROPOSED patch
64 * i2c/other/wm8776.c - low-level access routin
65 * include/wm8776.h
66
67
68 Note that the wm8776.c code is meant to be car
69 This is done in maya44.c, mainly because some
70
71
72 the following files were created in pci/ice172
73
74 * wtm.h
75 * vt1720_mobo.h
76 * revo.h
77 * prodigy192.h
78 * pontis.h
79 * phase.h
80 * maya44.h
81 * juli.h
82 * aureon.h
83 * amp.h
84 * envy24ht.h
85 * se.h
86 * prodigy_hifi.h
87
88
89 *I hope this is the correct way to do things.*
90
91
92 SAMPLING RATES
93 ==============
94
95 The Maya44 card (or more exactly, the Wolfson
96
97 As the ICE1724 chip only allows one global sam
98
99 * setting the sampling rate on any open PCM de
100
101 * In the current state of the driver, setting
102
103 *AVOID CAPTURING AT RATES ABOVE 96kHz*, even t
104
105
106 I propose some additional code for limiting th
107
108 The proposed code (currently deactivated) is i
109
110
111 SOUND DEVICES
112 =============
113
114 PCM devices correspond to inputs/outputs as fo
115
116 * hw:0,0 input - stereo, analog input 1+2
117 * hw:0,0 output - stereo, analog output 1+2
118 * hw:0,1 input - stereo, analog input 3+4 OR S
119 * hw:0,1 output - stereo, analog output 3+4 (a
120
121
122 NAMING OF MIXER CONTROLS
123 ========================
124
125 (for more information about the signal flow, p
126
127
128 PCM
129 (digital) output level for channel 1+2
130 PCM 1
131 same for channel 3+4
132
133 Mic Phantom+48V
134 switch for +48V phantom power for electros
135
136 Make sure this is not turned on while any
137 It might damage the source and/or the maya
138
139 Mic/Line input
140 if switch is on, input jack 1/2 is microph
141
142 Bypass
143 analogue bypass from ADC input to output f
144 Bypass 1
145 same for channel 3+4.
146
147 Crossmix
148 cross-mixer from channels 1+2 to channels
149 Crossmix 1
150 cross-mixer from channels 3+4 to channels
151
152 IEC958 Output
153 switch for S/PDIF output.
154
155 This is not supported by the ESI windows d
156 S/PDIF should output the same signal as ch
157
158
159 Digital output selectors
160 These switches allow a direct digital rout
161 Each switch determines where the digital i
162 They are not supported by the ESI windows
163 For normal operation, they should all be s
164
165 H/W
166 Output source channel 1
167 H/W 1
168 Output source channel 2
169 H/W 2
170 Output source channel 3
171 H/W 3
172 Output source channel 4
173
174 H/W 4 ... H/W 9
175 unknown function, left in to enable testin
176
177 Possibly some of these control S/PDIF outp
178 If these turn out to be unused, they will
179
180 Selectable values for each of the digital outp
181
182 PCM out
183 DAC output of the corresponding channe
184 Input 1 ... Input 4
185 direct routing from ADC output of the
186
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