1 =========================
2 Kernel driver i2c-parport
3 =========================
4
5 Author: Jean Delvare <jdelvare@suse.de>
6
7 This is a unified driver for several i2c-over-
8 such as the ones made by Philips, Velleman or
9 meant as a replacement for the older, individu
10
11 * i2c-philips-par
12 * i2c-elv
13 * i2c-velleman
14 * video/i2c-parport
15 (NOT the same as this one, dedicated to hom
16
17 It currently supports the following devices:
18
19 * (type=0) Philips adapter
20 * (type=1) home brew teletext adapter
21 * (type=2) Velleman K8000 adapter
22 * (type=3) ELV adapter
23 * (type=4) Analog Devices ADM1032 evaluation
24 * (type=5) Analog Devices evaluation boards:
25 * (type=6) Barco LPT->DVI (K5800236) adapter
26 * (type=7) One For All JP1 parallel port adap
27 * (type=8) VCT-jig
28
29 These devices use different pinout configurati
30 the driver what you have, using the type modul
31 way to autodetect the devices. Support for dif
32 can be easily added when needed.
33
34 Earlier kernels defaulted to type=0 (Philips).
35 parameter is missing, the driver will simply f
36
37 SMBus alert support is available on adapters w
38 connected to the parallel port's interrupt pin
39
40
41 Building your own adapter
42 -------------------------
43
44 If you want to build you own i2c-over-parallel
45 a sample electronics schema (credits go to Syl
46
47 Device
48 Side ___________________Vdd (+)
49 | | |
50 --- --- ---
51 | | | | | |
52 |R| |R| |R|
53 | | | | | |
54 --- --- ---
55 | | |
56 | | /| |
57 SCL ----------x--------o |-----------x-----
58 | \| | |
59 | | |
60 | |\ | |
61 SDA ----------x----x---| o---x-------------
62 | |/ |
63 | |
64 | /| |
65 ---------o |----------------x
66 \| | |
67 | |
68 --- --
69 | | |
70 |R| |R
71 | | |
72 --- --
73 | |
74 ### ##
75 GND GN
76
77 Remarks:
78 - This is the exact pinout and electronics us
79 evaluation boards.
80 - All inverters::
81
82 /|
83 -o |-
84 \|
85
86 must be 74HC05, they must be open collector
87 - All resitors are 10k.
88 - Pins 18-25 of the parallel port connected t
89 - Pins 4-9 (D2-D7) could be used as VDD is th
90 The ADM1032 evaluation board uses D4-D7. Be
91 current you can draw from the parallel port
92 all connected lines MUST BE driven at the s
93 circuit the output buffers! So plugging the
94 the i2c-parport module might be a good safe
95 prior to init may be unknown.
96 - This is 5V!
97 - Obviously you cannot read SCL (so it's not
98 Pretty easy to add, just copy the SDA part
99 That would give (ELV compatible pinout)::
100
101
102 Device
103 Side __________________________
104 | | | |
105 --- --- --- ---
106 | | | | | | | |
107 |R| |R| |R| |R|
108 | | | | | | | |
109 --- --- --- ---
110 | | | |
111 | | |\ | |
112 SCL ----------x--------x--| o---x------
113 | | |/ |
114 | | |
115 | | /| |
116 | ---o |----------
117 | \| |
118 | |
119 | |
120 | |\ |
121 SDA ---------------x---x--| o--------x-
122 | |/
123 |
124 | /|
125 ---o |----------
126 \|
127
128
129
130
131
132
133
134
135
136
137
138 If possible, you should use the same pinout co
139 adapters do, so you won't even have to change
140
141
142 Similar (but different) drivers
143 -------------------------------
144
145 This driver is NOT the same as the i2c-pport d
146 package. The i2c-pport driver makes use of mod
147 that you don't need additional electronics. It
148 however, and was not ported to Linux 2.6 (yet)
149
150 This driver is also NOT the same as the i2c-pc
151 lm_sensors package. The i2c-pcf-epp driver doe
152 an I2C bus directly. Instead, it uses it to co
153 master. That driver was not ported to Linux 2.
154
155
156 Legacy documentation for Velleman adapter
157 -----------------------------------------
158
159 Useful links:
160
161 - Velleman http://www.velleman.
162 - Velleman K8000 Howto http://howto.htlw16.
163
164 The project has lead to new libs for the Velle
165
166 LIBK8000 v1.99.1 and LIBK8005 v0.21
167
168 With these libs, you can control the K8000 int
169 stepper motor card with the simple commands wh
170 Velleman software, like SetIOchannel, ReadADch
171 many more, using /dev/velleman.
172
173 - http://home.wanadoo.nl/hihihi/libk8000.htm
174 - http://home.wanadoo.nl/hihihi/libk8005.htm
175 - http://struyve.mine.nu:8080/index.php?bloc
176 - http://sourceforge.net/projects/libk8005/
177
178
179 One For All JP1 parallel port adapter
180 -------------------------------------
181
182 The JP1 project revolves around a set of remot
183 the I2C bus their internal configuration EEPRO
184 jumper in the battery compartment. More detail
185
186 http://www.hifi-remote.com/jp1/
187
188 Details of the simple parallel port hardware c
189
190 http://www.hifi-remote.com/jp1/hardware.shtml
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