Commit Graph

4 Commits

Author SHA1 Message Date
Andy Shevchenko f4363d8107 leds: lp3952: Use 'if (ret)' pattern
Instead of unusual "if (!ret)" use "if (ret)" in lp3952_get_label().

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
2017-03-23 20:33:59 +01:00
Andy Shevchenko 9696217847 leds: lp3952: Remove ACPI support for lp3952
In ACPI world any ID should be carefully chosen and registered
officially. The discussion [1] as I read it gets to wilful assignment
an ID for non-existing real DSDT example.

Rafael already told [2] how this device would be enumerated using
compatible string. To be more precise look at the possible DSDT excerpt
below:

	Device (LDX0) {
		Name (_HID, "PRP0001")
		Name (_DDN, "TI LP3952 compatible led driver")
		...
	})

	Name (_DSD, Package () {
		ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
		Package () {
			Package () {"compatible", "ti,lp3952"},
			...
		}
	})

Based on above, remove non-official ACPI IDs and enumeration from the
driver.

Note: currently driver has no compatible strings at all, to make above
working one should add at least one.

[1] https://e2e.ti.com/support/power_management/led_driver/f/192/t/524926
[2] https://www.spinics.net/lists/linux-acpi/msg67125.html

Cc: Tony Makkiel <tony.makkiel@daqri.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
2017-03-23 20:33:51 +01:00
Javier Martinez Canillas aa73684cde leds: lp3952: Export I2C module alias information for module autoload
If the driver is built as a module, I2C module alias information is not
filled so the module won't be autoloaded if the device isn't registered
over ACPI. Export the I2C device table alias with MODULE_DEVICE_TABLE()
macro so the information is exported in the module.

Before this patch:

$ modinfo drivers/leds/leds-lp3952.ko | grep alias
alias:          acpi*:TXNW3952:*

After this patch:

$ modinfo drivers/leds/leds-lp3952.ko | grep alias
alias:          i2c:lp3952
alias:          acpi*:TXNW3952:*

Signed-off-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com>
2016-11-22 12:07:03 +01:00
Tony Makkiel d966c943e4 leds: LED driver for TI LP3952 6-Channel Color LED
The chip can drive 2 sets of RGB leds. Controller can
be controlled via PWM, I2C and audio synchronisation.
This driver uses I2C to communicate with the chip.

Datasheet: http://www.ti.com/lit/gpn/lp3952

Signed-off-by: Tony Makkiel <tony.makkiel@daqri.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Axel Lin <axel.lin@ingics.com>
Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com>
2016-07-18 08:46:09 +02:00