1 .. SPDX-License-Identifier: GPL-2.0
2
3 .. include:: <isonum.txt>
4
5 The Silicon Labs Si470x FM Radio Receivers dri
6 ==============================================
7
8 Copyright |copy| 2009 Tobias Lorenz <tobias.lor
9
10
11 Information from Silicon Labs
12 -----------------------------
13
14 Silicon Laboratories is the manufacturer of th
15 most often used radio receivers in cell phones
16 I2C. But SiLabs also provides a reference desi
17 together with a small microcontroller C8051F32
18 Part of this reference design is also a radio
19 code. The software also contains an automatic
20 current version. Information on these can be d
21 http://www.silabs.com/usbradio
22
23
24 Supported ICs
25 -------------
26
27 The following ICs have a very similar register
28 supported somewhen by the driver:
29
30 - Si4700: FM radio receiver
31 - Si4701: FM radio receiver, RDS Support
32 - Si4702: FM radio receiver
33 - Si4703: FM radio receiver, RDS Support
34 - Si4704: FM radio receiver, no external anten
35 - Si4705: FM radio receiver, no external anten
36 - Si4706: Enhanced FM RDS/TMC radio receiver,
37 Support
38 - Si4707: Dedicated weather band radio receive
39 - Si4708: Smallest FM receivers
40 - Si4709: Smallest FM receivers, RDS Support
41
42 More information on these can be downloaded he
43 http://www.silabs.com/products/mcu/Pages/USBFM
44
45
46 Supported USB devices
47 ---------------------
48
49 Currently the following USB radios (vendor:pro
50 chips are known to work:
51
52 - 10c4:818a: Silicon Labs USB FM Radio Referen
53 - 06e1:a155: ADS/Tech FM Radio Receiver (forme
54 - 1b80:d700: KWorld USB FM Radio SnapMusic Mob
55 - 10c5:819a: Sanei Electric, Inc. FM USB Radio
56
57
58 Software
59 --------
60
61 Testing is usually done with most application
62
63 - fmtools - Utility for managing FM tuner card
64 - gnomeradio - FM-radio tuner for the GNOME de
65 - gradio - GTK FM radio tuner
66 - kradio - Comfortable Radio Application for K
67 - radio - ncurses-based radio application
68 - mplayer - The Ultimate Movie Player For Linu
69 - v4l2-ctl - Collection of command line video4
70
71 For example, you can use:
72
73 .. code-block:: none
74
75 v4l2-ctl -d /dev/radio0 --set-ctrl=vol
76
77 There is also a library libv4l, which can be u
78 for frequency seeking, either by using hardwar
79 or by implementing a function as we currently
80 programs. Somewhen the radio programs should m
81
82 For processing RDS information, there is a pro
83 http://rdsd.berlios.de/
84
85 There is currently no project for making TMC s
86
87
88 Audio Listing
89 -------------
90
91 USB Audio is provided by the ALSA snd_usb_audi
92 also select SND_USB_AUDIO, as this is required
93 listing you have to redirect the sound, for ex
94 commands. Please adjust the audio devices to y
95
96 If you just want to test audio (very poor qual
97
98 .. code-block:: none
99
100 cat /dev/dsp1 > /dev/dsp
101
102 If you use sox + OSS try:
103
104 .. code-block:: none
105
106 sox -2 --endian little -r 96000 -t oss
107
108 or using sox + alsa:
109
110 .. code-block:: none
111
112 sox --endian little -c 2 -S -r 96000 -
113
114 If you use arts try:
115
116 .. code-block:: none
117
118 arecord -D hw:1,0 -r96000 -c2 -f S16_L
119
120 If you use mplayer try:
121
122 .. code-block:: none
123
124 mplayer -radio adevice=hw=1.0:arate=96
125 -rawaudio rate=96000 \
126 radio://<frequency>/capture
127
128 Module Parameters
129 -----------------
130
131 After loading the module, you still have acces
132 mount under /sys/module/radio_si470x/parameter
133 (0444) are not updated, even if space, band an
134 video controls. The others are runtime changea
135
136
137 Errors
138 ------
139
140 Increase tune_timeout, if you often get -EIO e
141
142 When timed out or band limit is reached, hw_fr
143
144 If you get any errors from snd_usb_audio, plea
145
146
147 Open Issues
148 -----------
149
150 V4L minor device allocation and parameter sett
151 currently under discussion.
152
153 There is an USB interface for downloading/uplo
154 for it can be implemented using the request_fi
155
156 There is a RDS interrupt mode. The driver is a
157 for polling RDS information, but is currently
158
159 There is a LED interface, which can be used to
160 programmed in the firmware. This can be made a
161 functions in the kernel.
162
163
164 Other useful information and links
165 ----------------------------------
166
167 http://www.silabs.com/usbradio
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