1 Kernel driver tc654 1 Kernel driver tc654
2 =================== 2 ===================
3 3
4 Supported chips: 4 Supported chips:
5 5
6 * Microchip TC654 and TC655 6 * Microchip TC654 and TC655
7 7
8 Prefix: 'tc654' 8 Prefix: 'tc654'
9 Datasheet: http://ww1.m 9 Datasheet: http://ww1.m
10 icrochip.com/downloads/en/DeviceDoc/200017 10 icrochip.com/downloads/en/DeviceDoc/20001734C.pdf
11 11
12 Authors: 12 Authors:
13 - Chris Packham <chris.packham@alliedtele 13 - Chris Packham <chris.packham@alliedtelesis.co.nz>
14 - Masahiko Iwamoto <iwamoto@allied-telesi 14 - Masahiko Iwamoto <iwamoto@allied-telesis.co.jp>
15 15
16 Description 16 Description
17 ----------- 17 -----------
18 This driver implements support for the Microch 18 This driver implements support for the Microchip TC654 and TC655.
19 19
20 The TC654 uses the 2-wire interface compatible 20 The TC654 uses the 2-wire interface compatible with the SMBUS 2.0
21 specification. The TC654 has two (2) inputs fo 21 specification. The TC654 has two (2) inputs for measuring fan RPM and
22 one (1) PWM output which can be used for fan c 22 one (1) PWM output which can be used for fan control.
23 23
24 Configuration Notes 24 Configuration Notes
25 ------------------- 25 -------------------
26 Ordinarily the pwm1_mode ABI is used for contr 26 Ordinarily the pwm1_mode ABI is used for controlling the pwm output
27 mode. However, for this chip the output is al 27 mode. However, for this chip the output is always pwm, and the
28 pwm1_mode determines if the pwm output is cont 28 pwm1_mode determines if the pwm output is controlled via the pwm1 value
29 or via the Vin analog input. 29 or via the Vin analog input.
30 30
31 31
32 Setting pwm1_mode to 1 will cause the pwm outp 32 Setting pwm1_mode to 1 will cause the pwm output to be driven based on
33 the pwm1 value. Setting pwm1_mode to 0 will ca 33 the pwm1 value. Setting pwm1_mode to 0 will cause the pwm output to be
34 driven based on the Vin input. 34 driven based on the Vin input.
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