linux-stable.git/drivers/i2c/algos, branch linux-4.9.y

i2c: algo: pca: Reapply i2c bus settings after reset

2020-09-23T06:46:15+00:00

[ Upstream commit 0a355aeb24081e4538d4d424cd189f16c0bbd983 ]

If something goes wrong (such as the SCL being stuck low) then we need
to reset the PCA chip. The issue with this is that on reset we lose all
config settings and the chip ends up in a disabled state which results
in a lock up/high CPU usage. We need to re-apply any configuration that
had previously been set and re-enable the chip.

Signed-off-by: Evan Nimmo 
Reviewed-by: Chris Packham 
Reviewed-by: Andy Shevchenko 
Signed-off-by: Wolfram Sang 
Signed-off-by: Sasha Levin

i2c: algo-pca: Add 0x78 as SCL stuck low status for PCA9665

2020-07-09T07:35:56+00:00

[ Upstream commit cd217f2300793a106b49c7dfcbfb26e348bc7593 ]

The PCA9665 datasheet says that I2CSTA = 78h indicates that SCL is stuck
low, this differs to the PCA9564 which uses 90h for this indication.
Treat either 0x78 or 0x90 as an indication that the SCL line is stuck.

Based on looking through the PCA9564 and PCA9665 datasheets this should
be safe for both chips. The PCA9564 should not return 0x78 for any valid
state and the PCA9665 should not return 0x90.

Fixes: eff9ec95efaa ("i2c-algo-pca: Add PCA9665 support")
Signed-off-by: Chris Packham 
Reviewed-by: Andy Shevchenko 
Signed-off-by: Wolfram Sang 
Signed-off-by: Sasha Levin

i2c: algo-bit: declare i2c_bit_quirk_no_clk_stretch as static

2016-05-11T15:16:30+00:00

i2c_bit_quirk_no_clk_stretch is used in i2c-algo-bit.c only, so
declare it as static.

Signed-off-by: Michele Curti 
Signed-off-by: Wolfram Sang

i2c: algo-bit: add I2C_AQ_NO_CLK_STRETCH

2015-11-30T17:37:25+00:00

Add I2C_AQ_NO_CLK_STRETCH to drivers/i2c/algos/i2c-algo-bit.c when getscl
is not available.

Signed-off-by: Nicola Corna 
Signed-off-by: Wolfram Sang

i2c: algo-pca: fix typo in comment

2015-05-31T23:41:19+00:00

Signed-off-by: Shailendra Verma 
Signed-off-by: Wolfram Sang

i2c: remove FSF address

2014-11-07T17:35:33+00:00

We have a central copy of the GPL for that. Some addresses were already
outdated.

Signed-off-by: Wolfram Sang

Merge branch 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux

2014-01-30T03:56:20+00:00

Pull more i2c updates from Wolfram Sang:
 "Mostly bugfixes, small but wanted cleanups, and Paul's init.h removal
  applied"

* 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux:
  i2c: rcar: fix NACK error code
  i2c: update i2c_algorithm documentation
  i2c: rcar: use devm_clk_get to ensure clock is properly ref-counted
  i2c: rcar: do not print error if device nacks transfer
  i2c: rely on driver core when sanitizing devices
  i2c: delete non-required instances of include 
  i2c: acorn: is tristate and should use module.h
  i2c: piix4: Standardize log messages
  i2c: piix4: Use different message for AMD Auxiliary SMBus Controller
  i2c: piix4: Add support for AMD ML and CZ SMBus changes

Update Jean Delvare's e-mail address

2014-01-29T19:40:08+00:00

Signed-off-by: Jean Delvare

i2c: delete non-required instances of include

2014-01-24T17:24:31+00:00

None of these files are actually using any __init type directives
and hence don't need to include .  Most are just a
left over from __devinit and __cpuinit removal, or simply due to
code getting copied from one driver to the next.

Signed-off-by: Paul Gortmaker 
Acked-by: Jean Delvare 
Signed-off-by: Wolfram Sang

Merge tag 'v3.6-rc7' into i2c-embedded/for-next

2012-10-08T10:46:32+00:00

Linux 3.6-rc7

Needed to get updates from i2c-embedded/for-current into i2c-embedded/for-next