linux/drivers/i2c/algos, branch v3.2.38

i2c-algo-bit: Fix spurious SCL timeouts under heavy load

2012-03-19T16:02:35Z

commit 8ee161ce5e0cfc689eb677f227a6248191165fac upstream. When the system is under heavy load, there can be a significant delay between the getscl() and time_after() calls inside sclhi(). That delay may cause the time_after() check to trigger after SCL has gone high, causing sclhi() to return -ETIMEDOUT. To fix the problem, double check that SCL is still low after the timeout has been reached, before deciding to return -ETIMEDOUT. Signed-off-by: Ville Syrjala Signed-off-by: Jean Delvare Signed-off-by: Greg Kroah-Hartman

i2c-algo-bit: Generate correct i2c address sequence for 10-bit target

2011-11-23T10:33:07Z

The wrong bits were put on the wire, fix that. This fixes kernel bug #42562. Signed-off-by: Sheng-Hui J. Chu Cc: stable@kernel.org Signed-off-by: Jean Delvare

i2c-algo-pca: Return standard fault codes

2011-10-30T12:47:25Z

Adjust i2c-algo-pca to return fault codes compliant with Documentation/i2c/fault-codes, rather than the undocumented and vague -EREMOTEIO. Signed-off-by: Jean Delvare Cc: Wolfram Sang

i2c-algo-bit: Return standard fault codes

2011-10-30T12:47:25Z

Adjust i2c-algo-bit to return fault codes compliant with Documentation/i2c/fault-codes, rather than the undocumented and vague -EREMOTEIO. Signed-off-by: Jean Delvare

i2c-algo-bit: Be verbose on bus testing failure

2011-10-30T12:47:25Z

If bus testing fails due to the bus being seen as busy, it might be helpful for developers to know which line is unexpectedly low. Signed-off-by: Jean Delvare Reviewed-by: Alex Deucher

i2c-algo-bit: Let user test buses without failing

2011-10-30T12:47:25Z

Always failing to register I2C buses when the line testing fails is a little harsh. While such a failure is definitely a bug in the driver that exposes the affected I2C bus, things may still work fine if the missing initialization steps are done later, before the I2C bus is used. So it seems a better debugging tool to just report the test failure by default. I introduce bit_test=2 if anyone really misses the original behavior of bit_test=1. Signed-off-by: Jean Delvare Reviewed-by: Alex Deucher

i2c-algo-bit: Call pre/post_xfer for bit_test

2011-04-17T08:20:19Z

Apparently some distros set i2c-algo-bit.bit_test to 1 by default. In some cases this causes i2c_bit_add_bus to fail and prevents the i2c bus from being added. In the radeon case, we fail to add the ddc i2c buses which prevents the driver from being able to detect attached monitors. The i2c bus works fine even if bit_test fails. This is likely due to gpio switching that is required and handled in the pre/post_xfer hooks, so call the pre/post_xfer hooks in the bit test as well. Fixes: https://bugs.freedesktop.org/show_bug.cgi?id=36221 Signed-off-by: Alex Deucher Signed-off-by: Jean Delvare Cc: stable@kernel.org [.38 down to .34]

Fix common misspellings

2011-03-31T14:26:23Z

Fixes generated by 'codespell' and manually reviewed. Signed-off-by: Lucas De Marchi

i2c-algo-bit: Complain about masters which can't read SCL

2011-01-10T21:11:23Z

The I2C specification explicitly describes both SDA and SCL as bidirectional lines. An I2C master with a read-only SCL is thus not compliant. If a slow slave stretches the clock, errors will happen, so the bus can't be considered as reliable. Signed-off-by: Jean Delvare

i2c-algo-bit: Refactor adapter registration

2011-01-10T21:11:23Z

Use a function pointer to decide whether to call i2c_add_adapter or i2c_add_numbered_adapter. This makes the code more compact than the current strategy of having the common code in a separate function. Signed-off-by: Jean Delvare