About Kernel Documentation Linux Kernel Contact Linux Resources Linux Blog

Documentation / video4linux / si476x.txt




Custom Search

Based on kernel version 3.13. Page generated on 2014-01-20 22:05 EST.

1	SI476x Driver Readme
2	------------------------------------------------
3		Copyright (C) 2013 Andrey Smirnov <andrew.smirnov@gmail.com>
4	
5	TODO for the driver
6	------------------------------
7	
8	- According to the SiLabs' datasheet it is possible to update the
9	  firmware of the radio chip in the run-time, thus bringing it to the
10	  most recent version. Unfortunately I couldn't find any mentioning of
11	  the said firmware update for the old chips that I tested the driver
12	  against, so for chips like that the driver only exposes the old
13	  functionality.
14	
15	
16	Parameters exposed over debugfs
17	-------------------------------
18	SI476x allow user to get multiple characteristics that can be very
19	useful for EoL testing/RF performance estimation, parameters that have
20	very little to do with V4L2 subsystem. Such parameters are exposed via
21	debugfs and can be accessed via regular file I/O operations.
22	
23	The drivers exposes following files:
24	
25	* /sys/kernel/debug/<device-name>/acf
26	  This file contains ACF(Automatically Controlled Features) status
27	  information. The contents of the file is binary data of the
28	  following layout:
29	
30	  Offset	| Name		| Description
31	  ====================================================================
32	  0x00		| blend_int	| Flag, set when stereo separation has
33	  		|  		| crossed below the blend threshold
34	  --------------------------------------------------------------------
35	  0x01		| hblend_int	| Flag, set when HiBlend cutoff
36	  		| 		| frequency is lower than threshold
37	  --------------------------------------------------------------------
38	  0x02		| hicut_int	| Flag, set when HiCut cutoff
39	  		| 		| frequency is lower than threshold
40	  --------------------------------------------------------------------
41	  0x03		| chbw_int	| Flag, set when channel filter
42	  		| 		| bandwidth is less than threshold
43	  --------------------------------------------------------------------
44	  0x04		| softmute_int	| Flag indicating that softmute
45	  		| 		| attenuation has increased above
46			|		| softmute threshold
47	  --------------------------------------------------------------------
48	  0x05		| smute		| 0 - Audio is not soft muted
49	  		| 		| 1 - Audio is soft muted
50	  --------------------------------------------------------------------
51	  0x06		| smattn	| Soft mute attenuation level in dB
52	  --------------------------------------------------------------------
53	  0x07		| chbw		| Channel filter bandwidth in kHz
54	  --------------------------------------------------------------------
55	  0x08		| hicut		| HiCut cutoff frequency in units of
56	  		| 		| 100Hz
57	  --------------------------------------------------------------------
58	  0x09		| hiblend	| HiBlend cutoff frequency in units
59	  		| 		| of 100 Hz
60	  --------------------------------------------------------------------
61	  0x10		| pilot		| 0 - Stereo pilot is not present
62	  		| 		| 1 - Stereo pilot is present
63	  --------------------------------------------------------------------
64	  0x11		| stblend	| Stereo blend in %
65	  --------------------------------------------------------------------
66	
67	
68	* /sys/kernel/debug/<device-name>/rds_blckcnt
69	  This file contains statistics about RDS receptions. It's binary data
70	  has the following layout:
71	
72	  Offset	| Name		| Description
73	  ====================================================================
74	  0x00		| expected	| Number of expected RDS blocks
75	  --------------------------------------------------------------------
76	  0x02		| received	| Number of received RDS blocks
77	  --------------------------------------------------------------------
78	  0x04		| uncorrectable	| Number of uncorrectable RDS blocks
79	  --------------------------------------------------------------------
80	
81	* /sys/kernel/debug/<device-name>/agc
82	  This file contains information about parameters pertaining to
83	  AGC(Automatic Gain Control)
84	
85	  The layout is:
86	  Offset	| Name		| Description
87	  ====================================================================
88	  0x00		| mxhi		| 0 - FM Mixer PD high threshold is
89	  		| 		| not tripped
90			|		| 1 - FM Mixer PD high threshold is
91			|		| tripped
92	  --------------------------------------------------------------------
93	  0x01		| mxlo		| ditto for FM Mixer PD low
94	  --------------------------------------------------------------------
95	  0x02		| lnahi		| ditto for FM LNA PD high
96	  --------------------------------------------------------------------
97	  0x03		| lnalo		| ditto for FM LNA PD low
98	  --------------------------------------------------------------------
99	  0x04		| fmagc1	| FMAGC1 attenuator resistance
100	  		| 		| (see datasheet for more detail)
101	  --------------------------------------------------------------------
102	  0x05		| fmagc2	| ditto for FMAGC2
103	  --------------------------------------------------------------------
104	  0x06		| pgagain	| PGA gain in dB
105	  --------------------------------------------------------------------
106	  0x07		| fmwblang	| FM/WB LNA Gain in dB
107	  --------------------------------------------------------------------
108	
109	* /sys/kernel/debug/<device-name>/rsq
110	  This file contains information about parameters pertaining to
111	  RSQ(Received Signal Quality)
112	
113	  The layout is:
114	  Offset	| Name		| Description
115	  ====================================================================
116	  0x00		| multhint	| 0 - multipath value has not crossed
117	  		| 		| the Multipath high threshold
118			|		| 1 - multipath value has crossed
119	  		| 		| the Multipath high threshold
120	  --------------------------------------------------------------------
121	  0x01		| multlint	| ditto for Multipath low threshold
122	  --------------------------------------------------------------------
123	  0x02		| snrhint	| 0 - received signal's SNR has not
124	  		| 		| crossed high threshold
125			|		| 1 - received signal's SNR has
126	  		| 		| crossed high threshold
127	  --------------------------------------------------------------------
128	  0x03		| snrlint	| ditto for low threshold
129	  --------------------------------------------------------------------
130	  0x04		| rssihint	| ditto for RSSI high threshold
131	  --------------------------------------------------------------------
132	  0x05		| rssilint	| ditto for RSSI low threshold
133	  --------------------------------------------------------------------
134	  0x06		| bltf		| Flag indicating if seek command
135	  		| 		| reached/wrapped seek band limit
136	  --------------------------------------------------------------------
137	  0x07		| snr_ready	| Indicates that SNR metrics is ready
138	  --------------------------------------------------------------------
139	  0x08		| rssiready	| ditto for RSSI metrics
140	  --------------------------------------------------------------------
141	  0x09		| injside	| 0 - Low-side injection is being used
142	  		| 		| 1 - High-side injection is used
143	  --------------------------------------------------------------------
144	  0x10		| afcrl		| Flag indicating if AFC rails
145	  --------------------------------------------------------------------
146	  0x11		| valid		| Flag indicating if channel is valid
147	  --------------------------------------------------------------------
148	  0x12		| readfreq	| Current tuned frequency
149	  --------------------------------------------------------------------
150	  0x14		| freqoff	| Singed frequency offset in units of
151	  		| 		| 2ppm
152	  --------------------------------------------------------------------
153	  0x15		| rssi		| Signed value of RSSI in dBuV
154	  --------------------------------------------------------------------
155	  0x16		| snr		| Signed RF SNR in dB
156	  --------------------------------------------------------------------
157	  0x17		| issi		| Signed Image Strength Signal
158	  		| 		| indicator
159	  --------------------------------------------------------------------
160	  0x18		| lassi		| Signed Low side adjacent Channel
161	  		| 		| Strength indicator
162	  --------------------------------------------------------------------
163	  0x19		| hassi		| ditto fpr High side
164	  --------------------------------------------------------------------
165	  0x20		| mult		| Multipath indicator
166	  --------------------------------------------------------------------
167	  0x21		| dev		| Frequency deviation
168	  --------------------------------------------------------------------
169	  0x24		| assi		| Adjacent channel SSI
170	  --------------------------------------------------------------------
171	  0x25		| usn		| Ultrasonic noise indicator
172	  --------------------------------------------------------------------
173	  0x26		| pilotdev	| Pilot deviation in units of 100 Hz
174	  --------------------------------------------------------------------
175	  0x27		| rdsdev	| ditto for RDS
176	  --------------------------------------------------------------------
177	  0x28		| assidev	| ditto for ASSI
178	  --------------------------------------------------------------------
179	  0x29		| strongdev	| Frequency deviation
180	  --------------------------------------------------------------------
181	  0x30		| rdspi		| RDS PI code
182	  --------------------------------------------------------------------
183	
184	* /sys/kernel/debug/<device-name>/rsq_primary
185	  This file contains information about parameters pertaining to
186	  RSQ(Received Signal Quality) for primary tuner only. Layout is as
187	  the one above.
Hide Line Numbers
About Kernel Documentation Linux Kernel Contact Linux Resources Linux Blog

Information is copyright its respective author. All material is available from the Linux Kernel Source distributed under a GPL License. This page is provided as a free service by mjmwired.net.