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gerrit-public.fairphone.software / kernel / msm-4.9 / bc2529c337fe7ea1a37cd5cdc17586f7ef73c4f1 / . / Documentation / i2c / busses / i2c-viapro
blob: 2e758b0e94564042d14d1d763d6a11fc998c181d [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]1Kernel driver i2c-viapro
2
3Supported adapters:
4 * VIA Technologies, Inc. VT82C596A/B
5 Datasheet: Sometimes available at the VIA website
6
Jean Delvare5f49ef82005-09-22 21:50:47 +0200[diff] [blame]7 * VIA Technologies, Inc. VT82C686A/B
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]8 Datasheet: Sometimes available at the VIA website
9
Rudolf Marekc2433532006-09-03 22:35:21 +0200[diff] [blame]10 * VIA Technologies, Inc. VT8231, VT8233, VT8233A
Jean Delvare87501972005-10-31 18:51:21 +0100[diff] [blame]11 Datasheet: available on request from VIA
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]12
Jean Delvare0d227a72008-01-27 18:14:51 +0100[diff] [blame]13 * VIA Technologies, Inc. VT8235, VT8237R, VT8237A, VT8237S, VT8251
Rudolf Marekc2433532006-09-03 22:35:21 +0200[diff] [blame]14 Datasheet: available on request and under NDA from VIA
15
Jean Delvareab6a6ed2007-02-13 22:09:02 +0100[diff] [blame]16 * VIA Technologies, Inc. CX700
17 Datasheet: available on request and under NDA from VIA
18
Rudolf Marekb806a712008-10-14 17:30:03 +0200[diff] [blame]19 * VIA Technologies, Inc. VX800/VX820
20 Datasheet: available on http://linux.via.com.tw
21
Harald Weltea2315912009-06-15 18:01:49 +0200[diff] [blame]22 * VIA Technologies, Inc. VX855/VX875
23 Datasheet: Availability unknown
24
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]25Authors:
John Anthony Kazos Jrbe2a6082007-05-09 08:50:42 +0200[diff] [blame]26 Kyösti Mälkki <kmalkki@cc.hut.fi>,
Jean Delvaref1183012005-09-22 21:58:41 +0200[diff] [blame]27 Mark D. Studebaker <mdsxyz123@yahoo.com>,
28 Jean Delvare <khali@linux-fr.org>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]29
30Module Parameters
31-----------------
32
33* force: int
34 Forcibly enable the SMBus controller. DANGEROUS!
35* force_addr: int
36 Forcibly enable the SMBus at the given address. EXTREMELY DANGEROUS!
37
38Description
39-----------
40
41i2c-viapro is a true SMBus host driver for motherboards with one of the
Jean Delvareaaf7f142005-09-22 22:09:07 +0200[diff] [blame]42supported VIA south bridges.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]43
44Your lspci -n listing must show one of these :
45
Jean Delvareaaf7f142005-09-22 22:09:07 +0200[diff] [blame]46 device 1106:3050 (VT82C596A function 3)
47 device 1106:3051 (VT82C596B function 3)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]48 device 1106:3057 (VT82C686 function 4)
49 device 1106:3074 (VT8233)
50 device 1106:3147 (VT8233A)
Jean Delvareaaf7f142005-09-22 22:09:07 +0200[diff] [blame]51 device 1106:8235 (VT8231 function 4)
52 device 1106:3177 (VT8235)
53 device 1106:3227 (VT8237R)
Rudolf Marekc2433532006-09-03 22:35:21 +0200[diff] [blame]54 device 1106:3337 (VT8237A)
Jean Delvare0d227a72008-01-27 18:14:51 +0100[diff] [blame]55 device 1106:3372 (VT8237S)
Rudolf Marekc2433532006-09-03 22:35:21 +0200[diff] [blame]56 device 1106:3287 (VT8251)
Jean Delvareab6a6ed2007-02-13 22:09:02 +0100[diff] [blame]57 device 1106:8324 (CX700)
Rudolf Marekb806a712008-10-14 17:30:03 +0200[diff] [blame]58 device 1106:8353 (VX800/VX820)
Harald Weltea2315912009-06-15 18:01:49 +0200[diff] [blame]59 device 1106:8409 (VX855/VX875)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700[diff] [blame]60
61If none of these show up, you should look in the BIOS for settings like
62enable ACPI / SMBus or even USB.
Jean Delvaref1183012005-09-22 21:58:41 +0200[diff] [blame]63
64Except for the oldest chips (VT82C596A/B, VT82C686A and most probably
65VT8231), this driver supports I2C block transactions. Such transactions
66are mainly useful to read from and write to EEPROMs.
Jean Delvareab6a6ed2007-02-13 22:09:02 +0100[diff] [blame]67
Rudolf Marekb806a712008-10-14 17:30:03 +0200[diff] [blame]68The CX700/VX800/VX820 additionally appears to support SMBus PEC, although
69this driver doesn't implement it yet.