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  1. 05 May, 2007 18 commits
  3. 04 May, 2007 9 commits
  5. 01 May, 2007 13 commits
    • Ben Dooks's avatar
      i2c-s3c2410: Fix bug in releasing driver · 5b68790c
      Ben Dooks authored 
      When compiled as a module, the i2c-s3c2410 driver does not
free either the IRQ or the i2c adapter it attached to the system.

As part of this fix, move to the usual kernel style
of freeing items as part of the probe error path
making the remove process easier.
Signed-off-by: default avatarBen Dooks <ben-linux@fluff.org>
Signed-off-by: default avatarJean Delvare <khali@linux-fr.org>
      5b68790c
    • Ben Dooks's avatar
      i2c-s3c2410: Fix I2C SDA to SCL setup time · e00a8cdf
      Ben Dooks authored 
      Fix the setup time for SDA to SCL due to the way
the S3C24XX I2C controller works.
Signed-off-by: default avatarBen Dooks <ben-linux@fluff.org>
Signed-off-by: default avatarJean Delvare <khali@linux-fr.org>
      e00a8cdf
    • Till Harbaum's avatar
      i2c: New i2c-tiny-usb bus driver · e8c76eed
      Till Harbaum authored 
      Add a driver for the i2c-tiny-usb interface. This is a simple
do-it-yourself USB to I2C interface targeted at experimental and
home use. See the i2c-tiny-usb homepage for hardware details:
http://www.harbaum.org/till/i2c_tiny_usbSigned-off-by: default avatarTill Harbaum <till@harbaum.org>
Signed-off-by: default avatarJean Delvare <khali@linux-fr.org>
      e8c76eed
    • Jean Delvare's avatar
      i2c: Documentation update · eefcd75e
      Jean Delvare authored 
      Make the documentation on how to write and port i2c drivers more in
line with the current state of things:
* i2c-isa is deprecated and soon gone, so stop advertising it.
* Drop many sensors-specific references. Most of them were outdated
  anyway.
* Update the example code to reflect the recent and not-so-recent
  API and coding style preference changes.
* Simplify the example init and cleanup functions.

This should make things less complex to understand for newcomers.
Signed-off-by: default avatarJean Delvare <khali@linux-fr.org>
      eefcd75e
    • Milind Arun Choudhary's avatar
      i2c: SPIN_LOCK_UNLOCKED cleanup · 35532d20
      Milind Arun Choudhary authored 
      SPIN_LOCK_UNLOCKED cleanup, use __SPIN_LOCK_UNLOCKED instead.
Signed-off-by: default avatarMilind Arun Choudhary <milindchoudhary@gmail.com>
Signed-off-by: default avatarJean Delvare <khali@linux-fr.org>
      35532d20
    • Jean Delvare's avatar
      i2c: Obsolete i2c-ixp2000, i2c-ixp4xx and scx200_i2c · 11de70bd
      Jean Delvare authored 
      The new generic i2c-gpio driver should be used instead.
The obsolete drivers will be removed in September 2007.
Signed-off-by: default avatarJean Delvare <khali@linux-fr.org>
Cc: Deepak Saxena <dsaxena@plexity.net>
Cc: Jordan Crouse <jordan.crouse@amd.com>
      11de70bd
    • Ben Dooks's avatar
      i2c: New Simtec I2C bus driver · bcda9f1e
      Ben Dooks authored 
      Platform driver for the Simtec CPLD based simple I2C logic.
Signed-off-by: default avatarBen Dooks <ben-linux@fluff.org>
Signed-off-by: default avatarJean Delvare <khali@linux-fr.org>
      bcda9f1e
    • Haavard Skinnemoen's avatar
      i2c: Bitbanging I2C bus driver using the GPIO API · 1c23af90
      Haavard Skinnemoen authored 
      This is a very simple bitbanging I2C bus driver utilizing the new
arch-neutral GPIO API. Useful for chips that don't have a built-in
I2C controller, additional I2C busses, or testing purposes.

To use, include something similar to the following in the
board-specific setup code:

  #include <linux/i2c-gpio.h>

  static struct i2c_gpio_platform_data i2c_gpio_data = {
	.sda_pin	= GPIO_PIN_FOO,
	.scl_pin	= GPIO_PIN_BAR,
  };
  static struct platform_device i2c_gpio_device = {
	.name		= "i2c-gpio",
	.id		= 0,
	.dev		= {
		.platform_data	= &i2c_gpio_data,
	},
  };

Register this platform_device, set up the I2C pins as GPIO if
required and you're ready to go. This will use default values for
udelay and timeout, and will work with GPIO hardware that does not
support open drain mode, but allows sensing of the SDA and SCL lines
even when they are being driven.
Signed-off-by: default avatarHaavard Skinnemoen <hskinnemoen@atmel.com>
Signed-off-by: default avatarJean Delvare <khali@linux-fr.org>
      1c23af90
    • Jan Engelhardt's avatar
      Use menuconfig objects - I2C · 16538e6b
      Jan Engelhardt authored 
      Allow the whole I2C menu to be disabled at once without diving into
the submenus for deselecting all options (should the user desire so).
Signed-off-by: default avatarJan Engelhardt <jengelh@gmx.de>
Signed-off-by: default avatarJean Delvare <khali@linux-fr.org>
      16538e6b
    • Jean Delvare's avatar
      i2c: Restore i2c_smbus_read_block_data · b86a1bc8
      Jean Delvare authored 
      Add back the i2c_smbus_read_block_data helper function, it is needed
by the upcoming lm93 hardware monitoring driver and possibly others.
Signed-off-by: default avatarJean Delvare <khali@linux-fr.org>
      b86a1bc8
    • Jean Delvare's avatar
      i2c-pxa: Clean transaction stop · 7d054817
      Jean Delvare authored 
      It was reported to me that the i2c-pxa driver was not able to process
more that 50 transactions per second. Investigation revealed that the
I2C unit was busy for 20 ms after every transaction. The reason seems
to be that we forget to clear the STOP and ACKNACK bits at the end of
the transaction. According to the PXA27x developer's manual, we shall
do so.
Signed-off-by: default avatarJean Delvare <khali@linux-fr.org>
Cc: Lennert Buytenhek <kernel@wantstofly.org>
Cc: Nicolas Pitre <nico@cam.org>
      7d054817
    • Jean Delvare's avatar
      i2c-algo-bit: Improve debugging · 494dbb64
      Jean Delvare authored 
      Improve the debugging features of the i2c-algo-bit driver:
* Make it possible to compile the driver without debugging support
  at all, making it much smaller.
* Use dev_dbg() for debugging messages where possible, and dev_err()
  for error messages.
* Remove redundant debugging messages.

These changes allowed for minor code cleanups, which are included
as well.
Signed-off-by: default avatarJean Delvare <khali@linux-fr.org>
      494dbb64
    • Jean Delvare's avatar
      i2c-algo-bit: Implement a 50/50 SCL duty cycle · 424ed67c
      Jean Delvare authored 
      The original i2c-algo-bit implementation uses a 33/66 SCL duty cycle
when bits are being written on the bus. While the I2C specification
doesn't forbid it, this prevents us from driving the I2C bus to its
max speed, limiting us to 66 kbps max on standard I2C busses.

Implementing a 50/50 duty cycle instead lets us max out the bandwidth
up to the theoretical max of 100 kbps on standard I2C busses. This is
particularly important when large amounts of data need to be transfered
over the bus, as is the case with some TV adapters when the firmware is
being uploaded.

In fact this change even allows, at least in theory, fast-mode I2C
support at 125, 166 and 250 kbps. There's no way to reach the
theoretical max of 400 kbps with this implementation. But I don't
think we want to put efforts in that direction anyway: software-driven
I2C is very CPU-intensive and bad for latency.

Other timing changes:
* Don't set SDA high explicitly on error, we're going to issue a stop
  condition before we leave anyway.
* If an error occurs when sending the slave address, yield the CPU
  before retrying, and remove the additional delay after the new start
  condition.
Signed-off-by: default avatarJean Delvare <khali@linux-fr.org>
      424ed67c