[linux-dvb] Re: CX88 i2c issue w/ DVB tuners

[Johannes Stezenbach <js@linuxtv.org>]

Holger Waechtler wrote:
> $ wc  -l include/linux/i2c* drivers/i2c/*.[hc]drivers/i2c/algos/*.[hc]
> drivers/i2c/busses/*.[ch]
>     54 include/linux/i2c-algo-bit.h
>     69 include/linux/i2c-algo-ite.h
>     49 include/linux/i2c-algo-pcf.h
>     48 include/linux/i2c-dev.h
>    292 include/linux/i2c-id.h
>    299 include/linux/i2c-sensor.h
>     62 include/linux/i2c-vid.h
>    604 include/linux/i2c.h
>   1316 drivers/i2c/i2c-core.c
>    560 drivers/i2c/i2c-dev.c
>    167 drivers/i2c/i2c-sensor.c
>    573 drivers/i2c/algos/i2c-algo-bit.c
>    829 drivers/i2c/algos/i2c-algo-ite.c
>    117 drivers/i2c/algos/i2c-algo-ite.h
>    477 drivers/i2c/algos/i2c-algo-pcf.c
>     76 drivers/i2c/algos/i2c-algo-pcf.h
>    546 drivers/i2c/busses/i2c-ali1535.c
>    418 drivers/i2c/busses/i2c-ali1563.c
>    535 drivers/i2c/busses/i2c-ali15x3.c
>    418 drivers/i2c/busses/i2c-amd756.c
>    413 drivers/i2c/busses/i2c-amd8111.c
>    279 drivers/i2c/busses/i2c-elektor.c
>     86 drivers/i2c/busses/i2c-frodo.c
>    186 drivers/i2c/busses/i2c-hydra.c
>    649 drivers/i2c/busses/i2c-i801.c
>    258 drivers/i2c/busses/i2c-i810.c
>    831 drivers/i2c/busses/i2c-ibm_iic.c
>    124 drivers/i2c/busses/i2c-ibm_iic.h
>    535 drivers/i2c/busses/i2c-iop3xx.c
>    118 drivers/i2c/busses/i2c-iop3xx.h
>     72 drivers/i2c/busses/i2c-isa.c
>    272 drivers/i2c/busses/i2c-ite.c
>    181 drivers/i2c/busses/i2c-ixp4xx.c
>    764 drivers/i2c/busses/i2c-keywest.c
>    108 drivers/i2c/busses/i2c-keywest.h
>    405 drivers/i2c/busses/i2c-nforce2.c
>    175 drivers/i2c/busses/i2c-parport-light.c
>    267 drivers/i2c/busses/i2c-parport.c
>     94 drivers/i2c/busses/i2c-parport.h
>    518 drivers/i2c/busses/i2c-piix4.c
>    339 drivers/i2c/busses/i2c-prosavage.c
>    102 drivers/i2c/busses/i2c-rpx.c
>    203 drivers/i2c/busses/i2c-savage4.c
>    417 drivers/i2c/busses/i2c-sis5595.c
>    520 drivers/i2c/busses/i2c-sis630.c
>    366 drivers/i2c/busses/i2c-sis96x.c
>    183 drivers/i2c/busses/i2c-via.c
>    482 drivers/i2c/busses/i2c-viapro.c
>    252 drivers/i2c/busses/i2c-voodoo3.c
>    555 drivers/i2c/busses/scx200_acb.c
>    131 drivers/i2c/busses/scx200_i2c.c
>  17394 total

This just shows that a bus driver has 100..500 lines of code.
And nearly half of i2c-core is SMBUS stuff which doesn't really
hurt but could probably be made #ifdef CONFIG_SMBUS.
i2c-dev is optional but IMHO useful for debugging.
And bit-banging is optional but already there if you need it.

I don't get what your problem is with kernel I2C. IMHO there
is nothing which a few simple patches couldn't fix.

Johannes