linux-toradex.git/drivers/gpio/max7301.c, branch v2.6.30

gpio: fix probe() error return in gpio driver probes

2009-01-16T00:39:35+00:00

A number of drivers in drivers/gpio return -ENODEV when confronted with
missing setup parameters such as the platform data.  However, returning
-ENODEV causes the driver layer to silently ignore the driver as it
assumes the probe did not find anything and was only speculative.

To make life easier to discern why a driver is not being attached, change
to returning -EINVAL, which is a better description of the fact that the
driver data was not valid.

Also add a set of dev_dbg() statements to the error paths to provide an
better explanation of the error as there may be more that one point in the
driver.

Signed-off-by: Ben Dooks 
Cc: David Brownell 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

gpio: max7301: fix the race between chip addition and pins reconfiguration

2008-10-16T18:21:40+00:00

There is a small race and code ugliness in max7301: pins are reconfigured
after the chip is registered.  Swap these calls so that the device is
registered in correct state.

Also this fixes the comile-time warning about unchecked gpiochip_remove.

Signed-off-by: Dmitry Baryshkov 
Cc: Juergen Beisert 
Cc: Guennadi Liakhovetski 
Cc: Russell King 
Cc: David Brownell 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

spi: core and gpio expanders use subsys_init

2008-10-16T18:21:38+00:00

Make the SPI external GPIO expander drivers register themselves at
subsys_initcall() time when they're statically linked, and make the SPI
core do its driver model initialization earlier so that's safe.

SOC-integrated GPIOs are available starting very early -- often before
initcalls start to run, or earily in arch_initcall() at latest -- so this
improves consistency, letting more subsystems rely on GPIOs being usable
by their own subsys_initcall() code.

Signed-off-by: David Brownell 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

gpio: gpio driver for max7301 SPI GPIO expander

2008-07-22T16:59:40+00:00

Maxim's MAX7301 is an SPI GPIO expander with 28 GPIOs.  Note: MAX7301's
interrupt feature is not supported yet.

[akpm@linux-foundation.org: coding-style fixes]
[g.liakhovetski@pengutronix.de: Fix inaccuracies in comments, check spi_setup()
return code, mask off high byte in max7301_read()]
Signed-off-by: Juergen Beisert 
Signed-off-by: Guennadi Liakhovetski 
Cc: Russell King 
Signed-off-by: David Brownell 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds