13 Jan, 2012

1 commit

• 245e99cfe   i2c/gpio-i2cmux: Convert to use module_platform_driver() ... Browse Code »

  Convert gpio-i2cmux to use the module_platform_driver() macro which
  makes the code smaller and a bit simpler.

  Signed-off-by: Axel Lin
  Acked-by: Peter Korsgaard
  Signed-off-by: Jean Delvare

  Axel Lin

  2012-01-13 03:32:04 +0800  

29 Jun, 2011

1 commit

• cd823db8b   i2c/pca954x: Initialize the mux to disconnected state ... Browse Code »

  pca954x power-on default is channel 0 connected. If multiple pca954x
  muxes are connected to the same physical I2C bus, the parent bus will
  see channel 0 devices behind both muxes by default. This is bad.

  Scenario:
  -- pca954x @ 0x70 -- ch 0 (I2C-bus-101) -- EEPROM @ 0x50
  |
  I2C-bus-1 ---
  |
  -- pca954x @ 0x71 -- ch 0 (I2C-bus-111) -- EEPROM @ 0x50

  1. Load I2C bus driver: creates I2C-bus-1
  2. Load pca954x driver: creates virtual I2C-bus-101 and I2C-bus-111
  3. Load eeprom driver
  4. Try to read EEPROM @ 0x50 on I2C-bus-101. The transaction will also bleed
  onto I2C-bus-111 because pca954x @ 0x71 channel 0 is connected by default.

  Fix: Initialize pca954x to disconnected state in pca954x_probe()

  Signed-off-by: Petri Gynther
  Signed-off-by: Jean Delvare
  Cc: stable@kernel.org

  Petri Gynther

  2011-06-29 17:36:11 +0800  

11 Jan, 2011

1 commit

• 92ed1a76c   i2c: Add generic I2C multiplexer using GPIO API ... Browse Code »

  Add an i2c mux driver providing access to i2c bus segments using a
  hardware MUX sitting on a master bus and controlled through gpio pins.

  E.G. something like:

  ---------- ---------- Bus segment 1 - - - - -
  | | SCL/SDA | |-------------- | |
  | |------------| |
  | | | | Bus segment 2 | |
  | Linux | GPIO 1..N | MUX |--------------- Devices
  | |------------| | | |
  | | | | Bus segment M
  | | | |---------------| |
  ---------- ---------- - - - - -

  SCL/SDA of the master I2C bus is multiplexed to bus segment 1..M
  according to the settings of the GPIO pins 1..N.

  Signed-off-by: Peter Korsgaard
  Signed-off-by: Jean Delvare

  Peter Korsgaard

  2011-01-11 05:11:23 +0800  

25 Oct, 2010

3 commits

• db79f2a1d   i2c/pca954x: Remove __devinit and __devexit from probe and remove functions ... Browse Code »

  The underlying I2C adapter may or may not be present when this driver
  gets initialized, and may disappear later, so there is no safe time at
  which the probe and remove functions can be discarded.

  Signed-off-by: Guenter Roeck
  Signed-off-by: Jean Delvare

  Guenter Roeck

  2010-10-25 00:16:59 +0800  
• ae63b13bb   i2c/mux: Driver for PCA9541 I2C Master Selector ... Browse Code »

  This patch adds support for PCA9541, an I2C Bus Master Selector.
  The driver is modeled as single channel I2C Multiplexer to be able to utilize
  the I2C multiplexer framework.

  Signed-off-by: Guenter Roeck
  Reviewed-by: Tom Grennan
  Acked-by: Jean Delvare

  Guenter Roeck

  2010-10-25 00:16:58 +0800  
• ef9d9b8fb   i2c: Change to new flag variable ... Browse Code »

  Replace EXTRA_CFLAGS with ccflags-y.

  Signed-off-by: matt mooney
  Signed-off-by: Jean Delvare

  matt mooney

  2010-10-25 00:16:58 +0800  

12 Aug, 2010

1 commit

• 7f528135d   i2c: I2C bus multiplexer driver pca954x ... Browse Code »

  I2C driver for PCA954x I2C multiplexer series.

  Signed-off-by: Michael Lawnick
  Acked-by: Rodolfo Giometti
  Signed-off-by: Jean Delvare

  Michael Lawnick

  2010-08-12 00:21:03 +0800