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authorDavid Rivshin <drivshin@allworx.com>2016-03-07 19:57:15 -0500
committerJacek Anaszewski <j.anaszewski@samsung.com>2016-03-14 09:22:21 +0100
commit9d7cffaf99f5f7756746a328c2854ebe4ce9f442 (patch)
tree40503bc473d633beaca0dfa78b20ed152e05faed /drivers/leds/Kconfig
parent4ef31e4993ffee122c06da04d3410c88c056286e (diff)
downloadlinux-9d7cffaf99f5f7756746a328c2854ebe4ce9f442.tar.bz2
leds: Add driver for the ISSI IS31FL32xx family of LED controllers
The IS31FL32xx family of LED controllers are I2C devices with multiple constant-current channels, each with independent 256-level PWM control. Datasheets: http://www.issi.com/US/product-analog-fxled-driver.shtml This has been tested on the IS31FL3236 and IS31FL3216, on an ARM (TI am335x) platform. The programming paradigm of these devices is similar in the following ways: - All registers are 8 bit - All LED control registers are write-only - Each LED channel has a PWM register (0-255) - PWM register writes are shadowed until an Update register is poked - All have a concept of Software Shutdown, which disables output However, there are some differences in devices: - 3236/3235 have a separate Control register for each LED, (3218/3216 pack the enable bits into fewer registers) - 3236/3235 have a per-channel current divisor setting - 3236/3235 have a Global Control register that can turn off all LEDs - 3216 is unique in a number of ways - OUT9-OUT16 can be configured as GPIOs instead of LED controls - LEDs can be programmed with an 8-frame animation, with programmable delay between frames - LEDs can be modulated by an input audio signal - Max output current can be adjusted from 1/4 to 2x globally - Has a Configuration register instead of a Shutdown register This driver currently only supports the base PWM control function of these devices. The following features of these devices are not implemented, although it should be possible to add them in the future: - All devices are capable of going into a lower-power "software shutdown" mode. - The is31fl3236 and is31fl3235 can reduce the max output current per-channel with a divisor of 1, 2, 3, or 4. - The is31fl3216 can use some LED channels as GPIOs instead. - The is31fl3216 can animate LEDs in hardware. - The is31fl3216 can modulate LEDs according to an audio input. - The is31fl3216 can reduce/increase max output current globally. Signed-off-by: David Rivshin <drivshin@allworx.com> Signed-off-by: Jacek Anaszewski <j.anaszewski@samsung.com>
Diffstat (limited to 'drivers/leds/Kconfig')
-rw-r--r--drivers/leds/Kconfig8
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/leds/Kconfig b/drivers/leds/Kconfig
index 7f940c24a16b..08a5743fe7a5 100644
--- a/drivers/leds/Kconfig
+++ b/drivers/leds/Kconfig
@@ -568,6 +568,14 @@ config LEDS_SEAD3
This driver can also be built as a module. If so the module
will be called leds-sead3.
+config LEDS_IS31FL32XX
+ tristate "LED support for ISSI IS31FL32XX I2C LED controller family"
+ depends on LEDS_CLASS && I2C && OF
+ help
+ Say Y here to include support for ISSI IS31FL32XX LED controllers.
+ They are I2C devices with multiple constant-current channels, each
+ with independent 256-level PWM control.
+
comment "LED driver for blink(1) USB RGB LED is under Special HID drivers (HID_THINGM)"
config LEDS_BLINKM