1 Kernel driver nsa320_hwmon
2 ==========================
3
4 Supported chips:
5
6 * Holtek HT46R065 microcontroller with onboa
7
8 it to act as a hardware monitor.
9
10 Prefix: 'nsa320'
11
12 Addresses scanned: none
13
14 Datasheet: Not available, driver was rever
15
16 Zyxel kernel source
17
18
19
20 Author:
21
22 Adam Baker <linux@baker-net.org.uk>
23
24 Description
25 -----------
26
27 This chip is known to be used in the Zyxel NSA
28 also in some variants of the NSA310 but the dr
29 on the NSA320. In all of these devices it is c
30 lines which are used to provide chip select, c
31 interface behaves similarly to SPI but at much
32 used for SPI.
33
34 Following each chip select pulse the chip will
35 that contains 0x55 as a marker to indicate tha
36 followed by an 8 bit fan speed in 100s of RPM
37 tenths of a degree.
38
39
40 sysfs-Interface
41 ---------------
42
43 ============= =================
44 temp1_input temperature input
45 fan1_input fan speed
46 ============= =================
47
48 Notes
49 -----
50
51 The access timings used in the driver are the
52 provided kernel. Testing has shown that if the
53 the first clock pulse is reduced from 100 ms t
54 will not produce any output. If the duration o
55 is reduced from 100 us to less than 15 us then
56 read twice corrupting the output. The above an
57 of one unit but suggests that the Zyxel provid
58 reasonable tolerance.
59
60 The driver incorporates a limit that it will n
61 faster than once a second. This is because the
62 time to read the data from the device and when
63 fan speed. As the most likely case for two acc
64 to read both of these values avoiding a second
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