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Based on kernel version 3.9. Page generated on 2013-05-02 23:08 EST.
1 Kernel driver i2c-parport 2 3 Author: Jean Delvare <khali@linux-fr.org> 4 5 This is a unified driver for several i2c-over-parallel-port adapters, 6 such as the ones made by Philips, Velleman or ELV. This driver is 7 meant as a replacement for the older, individual drivers: 8 * i2c-philips-par 9 * i2c-elv 10 * i2c-velleman 11 * video/i2c-parport (NOT the same as this one, dedicated to home brew 12 teletext adapters) 13 14 It currently supports the following devices: 15 * (type=0) Philips adapter 16 * (type=1) home brew teletext adapter 17 * (type=2) Velleman K8000 adapter 18 * (type=3) ELV adapter 19 * (type=4) Analog Devices ADM1032 evaluation board 20 * (type=5) Analog Devices evaluation boards: ADM1025, ADM1030, ADM1031 21 * (type=6) Barco LPT->DVI (K5800236) adapter 22 * (type=7) One For All JP1 parallel port adapter 23 24 These devices use different pinout configurations, so you have to tell 25 the driver what you have, using the type module parameter. There is no 26 way to autodetect the devices. Support for different pinout configurations 27 can be easily added when needed. 28 29 Earlier kernels defaulted to type=0 (Philips). But now, if the type 30 parameter is missing, the driver will simply fail to initialize. 31 32 SMBus alert support is available on adapters which have this line properly 33 connected to the parallel port's interrupt pin. 34 35 36 Building your own adapter 37 ------------------------- 38 39 If you want to build you own i2c-over-parallel-port adapter, here is 40 a sample electronics schema (credits go to Sylvain Munaut): 41 42 Device PC 43 Side ___________________Vdd (+) Side 44 | | | 45 --- --- --- 46 | | | | | | 47 |R| |R| |R| 48 | | | | | | 49 --- --- --- 50 | | | 51 | | /| | 52 SCL ----------x--------o |-----------x------------------- pin 2 53 | \| | | 54 | | | 55 | |\ | | 56 SDA ----------x----x---| o---x--------------------------- pin 13 57 | |/ | 58 | | 59 | /| | 60 ---------o |----------------x-------------- pin 3 61 \| | | 62 | | 63 --- --- 64 | | | | 65 |R| |R| 66 | | | | 67 --- --- 68 | | 69 ### ### 70 GND GND 71 72 Remarks: 73 - This is the exact pinout and electronics used on the Analog Devices 74 evaluation boards. 75 /| 76 - All inverters -o |- must be 74HC05, they must be open collector output. 77 \| 78 - All resitors are 10k. 79 - Pins 18-25 of the parallel port connected to GND. 80 - Pins 4-9 (D2-D7) could be used as VDD is the driver drives them high. 81 The ADM1032 evaluation board uses D4-D7. Beware that the amount of 82 current you can draw from the parallel port is limited. Also note that 83 all connected lines MUST BE driven at the same state, else you'll short 84 circuit the output buffers! So plugging the I2C adapter after loading 85 the i2c-parport module might be a good safety since data line state 86 prior to init may be unknown. 87 - This is 5V! 88 - Obviously you cannot read SCL (so it's not really standard-compliant). 89 Pretty easy to add, just copy the SDA part and use another input pin. 90 That would give (ELV compatible pinout): 91 92 93 Device PC 94 Side ______________________________Vdd (+) Side 95 | | | | 96 --- --- --- --- 97 | | | | | | | | 98 |R| |R| |R| |R| 99 | | | | | | | | 100 --- --- --- --- 101 | | | | 102 | | |\ | | 103 SCL ----------x--------x--| o---x------------------------ pin 15 104 | | |/ | 105 | | | 106 | | /| | 107 | ---o |-------------x-------------- pin 2 108 | \| | | 109 | | | 110 | | | 111 | |\ | | 112 SDA ---------------x---x--| o--------x------------------- pin 10 113 | |/ | 114 | | 115 | /| | 116 ---o |------------------x--------- pin 3 117 \| | | 118 | | 119 --- --- 120 | | | | 121 |R| |R| 122 | | | | 123 --- --- 124 | | 125 ### ### 126 GND GND 127 128 129 If possible, you should use the same pinout configuration as existing 130 adapters do, so you won't even have to change the code. 131 132 133 Similar (but different) drivers 134 ------------------------------- 135 136 This driver is NOT the same as the i2c-pport driver found in the i2c 137 package. The i2c-pport driver makes use of modern parallel port features so 138 that you don't need additional electronics. It has other restrictions 139 however, and was not ported to Linux 2.6 (yet). 140 141 This driver is also NOT the same as the i2c-pcf-epp driver found in the 142 lm_sensors package. The i2c-pcf-epp driver doesn't use the parallel port as 143 an I2C bus directly. Instead, it uses it to control an external I2C bus 144 master. That driver was not ported to Linux 2.6 (yet) either. 145 146 147 Legacy documentation for Velleman adapter 148 ----------------------------------------- 149 150 Useful links: 151 Velleman http://www.velleman.be/ 152 Velleman K8000 Howto http://howto.htlw16.ac.at/k8000-howto.html 153 154 The project has lead to new libs for the Velleman K8000 and K8005: 155 LIBK8000 v1.99.1 and LIBK8005 v0.21 156 With these libs, you can control the K8000 interface card and the K8005 157 stepper motor card with the simple commands which are in the original 158 Velleman software, like SetIOchannel, ReadADchannel, SendStepCCWFull and 159 many more, using /dev/velleman. 160 http://home.wanadoo.nl/hihihi/libk8000.htm 161 http://home.wanadoo.nl/hihihi/libk8005.htm 162 http://struyve.mine.nu:8080/index.php?block=k8000 163 http://sourceforge.net/projects/libk8005/ 164 165 166 One For All JP1 parallel port adapter 167 ------------------------------------- 168 169 The JP1 project revolves around a set of remote controls which expose 170 the I2C bus their internal configuration EEPROM lives on via a 6 pin 171 jumper in the battery compartment. More details can be found at: 172 173 http://www.hifi-remote.com/jp1/ 174 175 Details of the simple parallel port hardware can be found at: 176 177 http://www.hifi-remote.com/jp1/hardware.shtml
- [ busses ]
- i2c-ali1535
- i2c-ali1563
- i2c-ali15x3
- i2c-amd756
- i2c-amd8111
- i2c-diolan-u2c
- i2c-i801
- i2c-ismt
- i2c-nforce2
- i2c-ocores
- i2c-parport
- i2c-parport-light
- i2c-pca-isa
- i2c-piix4
- i2c-sis5595
- i2c-sis630
- i2c-sis96x
- i2c-taos-evm
- i2c-via
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- scx200_acb
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