Based on kernel version 4.16.1. Page generated on 2018-04-09 11:53 EST.
1 Kernel driver i2c-parport 2 3 Author: Jean Delvare <jdelvare@suse.de> 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 * (type=8) VCT-jig 24 25 These devices use different pinout configurations, so you have to tell 26 the driver what you have, using the type module parameter. There is no 27 way to autodetect the devices. Support for different pinout configurations 28 can be easily added when needed. 29 30 Earlier kernels defaulted to type=0 (Philips). But now, if the type 31 parameter is missing, the driver will simply fail to initialize. 32 33 SMBus alert support is available on adapters which have this line properly 34 connected to the parallel port's interrupt pin. 35 36 37 Building your own adapter 38 ------------------------- 39 40 If you want to build you own i2c-over-parallel-port adapter, here is 41 a sample electronics schema (credits go to Sylvain Munaut): 42 43 Device PC 44 Side ___________________Vdd (+) Side 45 | | | 46 --- --- --- 47 | | | | | | 48 |R| |R| |R| 49 | | | | | | 50 --- --- --- 51 | | | 52 | | /| | 53 SCL ----------x--------o |-----------x------------------- pin 2 54 | \| | | 55 | | | 56 | |\ | | 57 SDA ----------x----x---| o---x--------------------------- pin 13 58 | |/ | 59 | | 60 | /| | 61 ---------o |----------------x-------------- pin 3 62 \| | | 63 | | 64 --- --- 65 | | | | 66 |R| |R| 67 | | | | 68 --- --- 69 | | 70 ### ### 71 GND GND 72 73 Remarks: 74 - This is the exact pinout and electronics used on the Analog Devices 75 evaluation boards. 76 /| 77 - All inverters -o |- must be 74HC05, they must be open collector output. 78 \| 79 - All resitors are 10k. 80 - Pins 18-25 of the parallel port connected to GND. 81 - Pins 4-9 (D2-D7) could be used as VDD is the driver drives them high. 82 The ADM1032 evaluation board uses D4-D7. Beware that the amount of 83 current you can draw from the parallel port is limited. Also note that 84 all connected lines MUST BE driven at the same state, else you'll short 85 circuit the output buffers! So plugging the I2C adapter after loading 86 the i2c-parport module might be a good safety since data line state 87 prior to init may be unknown. 88 - This is 5V! 89 - Obviously you cannot read SCL (so it's not really standard-compliant). 90 Pretty easy to add, just copy the SDA part and use another input pin. 91 That would give (ELV compatible pinout): 92 93 94 Device PC 95 Side ______________________________Vdd (+) Side 96 | | | | 97 --- --- --- --- 98 | | | | | | | | 99 |R| |R| |R| |R| 100 | | | | | | | | 101 --- --- --- --- 102 | | | | 103 | | |\ | | 104 SCL ----------x--------x--| o---x------------------------ pin 15 105 | | |/ | 106 | | | 107 | | /| | 108 | ---o |-------------x-------------- pin 2 109 | \| | | 110 | | | 111 | | | 112 | |\ | | 113 SDA ---------------x---x--| o--------x------------------- pin 10 114 | |/ | 115 | | 116 | /| | 117 ---o |------------------x--------- pin 3 118 \| | | 119 | | 120 --- --- 121 | | | | 122 |R| |R| 123 | | | | 124 --- --- 125 | | 126 ### ### 127 GND GND 128 129 130 If possible, you should use the same pinout configuration as existing 131 adapters do, so you won't even have to change the code. 132 133 134 Similar (but different) drivers 135 ------------------------------- 136 137 This driver is NOT the same as the i2c-pport driver found in the i2c 138 package. The i2c-pport driver makes use of modern parallel port features so 139 that you don't need additional electronics. It has other restrictions 140 however, and was not ported to Linux 2.6 (yet). 141 142 This driver is also NOT the same as the i2c-pcf-epp driver found in the 143 lm_sensors package. The i2c-pcf-epp driver doesn't use the parallel port as 144 an I2C bus directly. Instead, it uses it to control an external I2C bus 145 master. That driver was not ported to Linux 2.6 (yet) either. 146 147 148 Legacy documentation for Velleman adapter 149 ----------------------------------------- 150 151 Useful links: 152 Velleman http://www.velleman.be/ 153 Velleman K8000 Howto http://howto.htlw16.ac.at/k8000-howto.html 154 155 The project has lead to new libs for the Velleman K8000 and K8005: 156 LIBK8000 v1.99.1 and LIBK8005 v0.21 157 With these libs, you can control the K8000 interface card and the K8005 158 stepper motor card with the simple commands which are in the original 159 Velleman software, like SetIOchannel, ReadADchannel, SendStepCCWFull and 160 many more, using /dev/velleman. 161 http://home.wanadoo.nl/hihihi/libk8000.htm 162 http://home.wanadoo.nl/hihihi/libk8005.htm 163 http://struyve.mine.nu:8080/index.php?block=k8000 164 http://sourceforge.net/projects/libk8005/ 165 166 167 One For All JP1 parallel port adapter 168 ------------------------------------- 169 170 The JP1 project revolves around a set of remote controls which expose 171 the I2C bus their internal configuration EEPROM lives on via a 6 pin 172 jumper in the battery compartment. More details can be found at: 173 174 http://www.hifi-remote.com/jp1/ 175 176 Details of the simple parallel port hardware can be found at: 177 178 http://www.hifi-remote.com/jp1/hardware.shtml