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authorLinus Torvalds <torvalds@linux-foundation.org>2013-02-26 18:29:02 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2013-02-26 18:29:02 +0100
commit0512c04a2b5d29a33d96d315e1d14c55f5148aa7 (patch)
tree6373c0370abe32e1e42a933bd9cd08727e48b5d9 /Documentation
parentMerge branch 'next' of git://git.infradead.org/users/vkoul/slave-dma (diff)
parentleds: leds-sunfire: use dev_err()/pr_err() instead of printk() (diff)
downloadlinux-0512c04a2b5d29a33d96d315e1d14c55f5148aa7.tar.xz
linux-0512c04a2b5d29a33d96d315e1d14c55f5148aa7.zip
Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/cooloney/linux-leds
Pull LED subsystem update from Bryan Wu. * 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/cooloney/linux-leds: (61 commits) leds: leds-sunfire: use dev_err()/pr_err() instead of printk() leds: 88pm860x: Add missing of_node_put() leds: tca6507: Use of_get_child_count() leds: leds-pwm: make it depend on PWM and not HAVE_PWM Documentation: leds: update LP55xx family devices leds-lp55xx: fix problem on removing LED attributes leds-lp5521/5523: add author and copyright description leds-lp5521/5523: use new lp55xx common header leds-lp55xx: clean up headers leds-lp55xx: clean up definitions leds-lp55xx: clean up unused data and functions leds-lp55xx: clean up _remove() leds-lp55xx: add new function for removing device attribtues leds-lp55xx: code refactoring on selftest function leds-lp55xx: use common device attribute driver function leds-lp55xx: support device specific attributes leds-lp5523: use generic firmware interface leds-lp5521: use generic firmware interface leds-lp55xx: support firmware interface leds-lp55xx: add new lp55xx_register_sysfs() for the firmware interface ...
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/devicetree/bindings/leds/leds-pwm.txt48
-rw-r--r--Documentation/devicetree/bindings/leds/tca6507.txt33
-rw-r--r--Documentation/leds/00-INDEX2
-rw-r--r--Documentation/leds/leds-lp5521.txt63
-rw-r--r--Documentation/leds/leds-lp5523.txt27
-rw-r--r--Documentation/leds/leds-lp55xx.txt118
6 files changed, 213 insertions, 78 deletions
diff --git a/Documentation/devicetree/bindings/leds/leds-pwm.txt b/Documentation/devicetree/bindings/leds/leds-pwm.txt
new file mode 100644
index 000000000000..7297107cf832
--- /dev/null
+++ b/Documentation/devicetree/bindings/leds/leds-pwm.txt
@@ -0,0 +1,48 @@
+LED connected to PWM
+
+Required properties:
+- compatible : should be "pwm-leds".
+
+Each LED is represented as a sub-node of the pwm-leds device. Each
+node's name represents the name of the corresponding LED.
+
+LED sub-node properties:
+- pwms : PWM property to point to the PWM device (phandle)/port (id) and to
+ specify the period time to be used: <&phandle id period_ns>;
+- pwm-names : (optional) Name to be used by the PWM subsystem for the PWM device
+ For the pwms and pwm-names property please refer to:
+ Documentation/devicetree/bindings/pwm/pwm.txt
+- max-brightness : Maximum brightness possible for the LED
+- label : (optional)
+ see Documentation/devicetree/bindings/leds/common.txt
+- linux,default-trigger : (optional)
+ see Documentation/devicetree/bindings/leds/common.txt
+
+Example:
+
+twl_pwm: pwm {
+ /* provides two PWMs (id 0, 1 for PWM1 and PWM2) */
+ compatible = "ti,twl6030-pwm";
+ #pwm-cells = <2>;
+};
+
+twl_pwmled: pwmled {
+ /* provides one PWM (id 0 for Charing indicator LED) */
+ compatible = "ti,twl6030-pwmled";
+ #pwm-cells = <2>;
+};
+
+pwmleds {
+ compatible = "pwm-leds";
+ kpad {
+ label = "omap4::keypad";
+ pwms = <&twl_pwm 0 7812500>;
+ max-brightness = <127>;
+ };
+
+ charging {
+ label = "omap4:green:chrg";
+ pwms = <&twl_pwmled 0 7812500>;
+ max-brightness = <255>;
+ };
+};
diff --git a/Documentation/devicetree/bindings/leds/tca6507.txt b/Documentation/devicetree/bindings/leds/tca6507.txt
new file mode 100644
index 000000000000..2b6693b972fb
--- /dev/null
+++ b/Documentation/devicetree/bindings/leds/tca6507.txt
@@ -0,0 +1,33 @@
+LEDs conected to tca6507
+
+Required properties:
+- compatible : should be : "ti,tca6507".
+
+Each led is represented as a sub-node of the ti,tca6507 device.
+
+LED sub-node properties:
+- label : (optional) see Documentation/devicetree/bindings/leds/common.txt
+- reg : number of LED line (could be from 0 to 6)
+- linux,default-trigger : (optional)
+ see Documentation/devicetree/bindings/leds/common.txt
+
+Examples:
+
+tca6507@45 {
+ compatible = "ti,tca6507";
+ #address-cells = <1>;
+ #size-cells = <0>;
+ reg = <0x45>;
+
+ led0: red-aux@0 {
+ label = "red:aux";
+ reg = <0x0>;
+ };
+
+ led1: green-aux@1 {
+ label = "green:aux";
+ reg = <0x5>;
+ linux,default-trigger = "default-on";
+ };
+};
+
diff --git a/Documentation/leds/00-INDEX b/Documentation/leds/00-INDEX
index 5fefe374892f..5246090ef15c 100644
--- a/Documentation/leds/00-INDEX
+++ b/Documentation/leds/00-INDEX
@@ -6,5 +6,7 @@ leds-lp5521.txt
- notes on how to use the leds-lp5521 driver.
leds-lp5523.txt
- notes on how to use the leds-lp5523 driver.
+leds-lp55xx.txt
+ - description about lp55xx common driver.
leds-lm3556.txt
- notes on how to use the leds-lm3556 driver.
diff --git a/Documentation/leds/leds-lp5521.txt b/Documentation/leds/leds-lp5521.txt
index 0e542ab3d4a0..270f57196339 100644
--- a/Documentation/leds/leds-lp5521.txt
+++ b/Documentation/leds/leds-lp5521.txt
@@ -17,19 +17,8 @@ lp5521:channelx, where x is 0 .. 2
All three channels can be also controlled using the engine micro programs.
More details of the instructions can be found from the public data sheet.
-Control interface for the engines:
-x is 1 .. 3
-enginex_mode : disabled, load, run
-enginex_load : store program (visible only in engine load mode)
-
-Example (start to blink the channel 2 led):
-cd /sys/class/leds/lp5521:channel2/device
-echo "load" > engine3_mode
-echo "037f4d0003ff6000" > engine3_load
-echo "run" > engine3_mode
-
-stop the engine:
-echo "disabled" > engine3_mode
+LP5521 has the internal program memory for running various LED patterns.
+For the details, please refer to 'firmware' section in leds-lp55xx.txt
sysfs contains a selftest entry.
The test communicates with the chip and checks that
@@ -47,7 +36,7 @@ The name of each channel can be configurable.
If the name field is not defined, the default name will be set to 'xxxx:channelN'
(XXXX : pdata->label or i2c client name, N : channel number)
-static struct lp5521_led_config lp5521_led_config[] = {
+static struct lp55xx_led_config lp5521_led_config[] = {
{
.name = "red",
.chan_nr = 0,
@@ -81,10 +70,10 @@ static void lp5521_enable(bool state)
/* Control of chip enable signal */
}
-static struct lp5521_platform_data lp5521_platform_data = {
+static struct lp55xx_platform_data lp5521_platform_data = {
.led_config = lp5521_led_config,
.num_channels = ARRAY_SIZE(lp5521_led_config),
- .clock_mode = LP5521_CLOCK_EXT,
+ .clock_mode = LP55XX_CLOCK_EXT,
.setup_resources = lp5521_setup,
.release_resources = lp5521_release,
.enable = lp5521_enable,
@@ -105,47 +94,9 @@ example of update_config :
LP5521_CP_MODE_AUTO | LP5521_R_TO_BATT | \
LP5521_CLK_INT)
-static struct lp5521_platform_data lp5521_pdata = {
+static struct lp55xx_platform_data lp5521_pdata = {
.led_config = lp5521_led_config,
.num_channels = ARRAY_SIZE(lp5521_led_config),
- .clock_mode = LP5521_CLOCK_INT,
+ .clock_mode = LP55XX_CLOCK_INT,
.update_config = LP5521_CONFIGS,
};
-
-LED patterns : LP5521 has autonomous operation without external control.
-Pattern data can be defined in the platform data.
-
-example of led pattern data :
-
-/* RGB(50,5,0) 500ms on, 500ms off, infinite loop */
-static u8 pattern_red[] = {
- 0x40, 0x32, 0x60, 0x00, 0x40, 0x00, 0x60, 0x00,
- };
-
-static u8 pattern_green[] = {
- 0x40, 0x05, 0x60, 0x00, 0x40, 0x00, 0x60, 0x00,
- };
-
-static struct lp5521_led_pattern board_led_patterns[] = {
- {
- .r = pattern_red,
- .g = pattern_green,
- .size_r = ARRAY_SIZE(pattern_red),
- .size_g = ARRAY_SIZE(pattern_green),
- },
-};
-
-static struct lp5521_platform_data lp5521_platform_data = {
- .led_config = lp5521_led_config,
- .num_channels = ARRAY_SIZE(lp5521_led_config),
- .clock_mode = LP5521_CLOCK_EXT,
- .patterns = board_led_patterns,
- .num_patterns = ARRAY_SIZE(board_led_patterns),
-};
-
-Then predefined led pattern(s) can be executed via the sysfs.
-To start the pattern #1,
-# echo 1 > /sys/bus/i2c/devices/xxxx/led_pattern
-(xxxx : i2c bus & slave address)
-To end the pattern,
-# echo 0 > /sys/bus/i2c/devices/xxxx/led_pattern
diff --git a/Documentation/leds/leds-lp5523.txt b/Documentation/leds/leds-lp5523.txt
index c2743f59f9ac..899fdad509fe 100644
--- a/Documentation/leds/leds-lp5523.txt
+++ b/Documentation/leds/leds-lp5523.txt
@@ -27,25 +27,8 @@ c) Default
If both fields are NULL, 'lp5523' is used by default.
/sys/class/leds/lp5523:channelN (N: 0 ~ 8)
-The chip provides 3 engines. Each engine can control channels without
-interaction from the main CPU. Details of the micro engine code can be found
-from the public data sheet. Leds can be muxed to different channels.
-
-Control interface for the engines:
-x is 1 .. 3
-enginex_mode : disabled, load, run
-enginex_load : microcode load (visible only in load mode)
-enginex_leds : led mux control (visible only in load mode)
-
-cd /sys/class/leds/lp5523:channel2/device
-echo "load" > engine3_mode
-echo "9d80400004ff05ff437f0000" > engine3_load
-echo "111111111" > engine3_leds
-echo "run" > engine3_mode
-
-sysfs contains a selftest entry. It measures each channel
-voltage level and checks if it looks reasonable. If the level is too high,
-the led is missing; if the level is too low, there is a short circuit.
+LP5523 has the internal program memory for running various LED patterns.
+For the details, please refer to 'firmware' section in leds-lp55xx.txt
Selftest uses always the current from the platform data.
@@ -58,7 +41,7 @@ Example platform data:
Note - chan_nr can have values between 0 and 8.
-static struct lp5523_led_config lp5523_led_config[] = {
+static struct lp55xx_led_config lp5523_led_config[] = {
{
.name = "D1",
.chan_nr = 0,
@@ -88,10 +71,10 @@ static void lp5523_enable(bool state)
/* Control chip enable signal */
}
-static struct lp5523_platform_data lp5523_platform_data = {
+static struct lp55xx_platform_data lp5523_platform_data = {
.led_config = lp5523_led_config,
.num_channels = ARRAY_SIZE(lp5523_led_config),
- .clock_mode = LP5523_CLOCK_EXT,
+ .clock_mode = LP55XX_CLOCK_EXT,
.setup_resources = lp5523_setup,
.release_resources = lp5523_release,
.enable = lp5523_enable,
diff --git a/Documentation/leds/leds-lp55xx.txt b/Documentation/leds/leds-lp55xx.txt
new file mode 100644
index 000000000000..ced41868d2d1
--- /dev/null
+++ b/Documentation/leds/leds-lp55xx.txt
@@ -0,0 +1,118 @@
+LP5521/LP5523/LP55231 Common Driver
+===================================
+
+Authors: Milo(Woogyom) Kim <milo.kim@ti.com>
+
+Description
+-----------
+LP5521, LP5523/55231 have common features as below.
+
+ Register access via the I2C
+ Device initialization/deinitialization
+ Create LED class devices for multiple output channels
+ Device attributes for user-space interface
+ Program memory for running LED patterns
+
+The LP55xx common driver provides these features using exported functions.
+ lp55xx_init_device() / lp55xx_deinit_device()
+ lp55xx_register_leds() / lp55xx_unregister_leds()
+ lp55xx_regsister_sysfs() / lp55xx_unregister_sysfs()
+
+( Driver Structure Data )
+
+In lp55xx common driver, two different data structure is used.
+
+o lp55xx_led
+ control multi output LED channels such as led current, channel index.
+o lp55xx_chip
+ general chip control such like the I2C and platform data.
+
+For example, LP5521 has maximum 3 LED channels.
+LP5523/55231 has 9 output channels.
+
+lp55xx_chip for LP5521 ... lp55xx_led #1
+ lp55xx_led #2
+ lp55xx_led #3
+
+lp55xx_chip for LP5523 ... lp55xx_led #1
+ lp55xx_led #2
+ .
+ .
+ lp55xx_led #9
+
+( Chip Dependent Code )
+
+To support device specific configurations, special structure
+'lpxx_device_config' is used.
+
+ Maximum number of channels
+ Reset command, chip enable command
+ Chip specific initialization
+ Brightness control register access
+ Setting LED output current
+ Program memory address access for running patterns
+ Additional device specific attributes
+
+( Firmware Interface )
+
+LP55xx family devices have the internal program memory for running
+various LED patterns.
+This pattern data is saved as a file in the user-land or
+hex byte string is written into the memory through the I2C.
+LP55xx common driver supports the firmware interface.
+
+LP55xx chips have three program engines.
+To load and run the pattern, the programming sequence is following.
+ (1) Select an engine number (1/2/3)
+ (2) Mode change to load
+ (3) Write pattern data into selected area
+ (4) Mode change to run
+
+The LP55xx common driver provides simple interfaces as below.
+select_engine : Select which engine is used for running program
+run_engine : Start program which is loaded via the firmware interface
+firmware : Load program data
+
+For example, run blinking pattern in engine #1 of LP5521
+echo 1 > /sys/bus/i2c/devices/xxxx/select_engine
+echo 1 > /sys/class/firmware/lp5521/loading
+echo "4000600040FF6000" > /sys/class/firmware/lp5521/data
+echo 0 > /sys/class/firmware/lp5521/loading
+echo 1 > /sys/bus/i2c/devices/xxxx/run_engine
+
+For example, run blinking pattern in engine #3 of LP55231
+echo 3 > /sys/bus/i2c/devices/xxxx/select_engine
+echo 1 > /sys/class/firmware/lp55231/loading
+echo "9d0740ff7e0040007e00a0010000" > /sys/class/firmware/lp55231/data
+echo 0 > /sys/class/firmware/lp55231/loading
+echo 1 > /sys/bus/i2c/devices/xxxx/run_engine
+
+To start blinking patterns in engine #2 and #3 simultaneously,
+for idx in 2 3
+do
+ echo $idx > /sys/class/leds/red/device/select_engine
+ sleep 0.1
+ echo 1 > /sys/class/firmware/lp5521/loading
+ echo "4000600040FF6000" > /sys/class/firmware/lp5521/data
+ echo 0 > /sys/class/firmware/lp5521/loading
+done
+echo 1 > /sys/class/leds/red/device/run_engine
+
+Here is another example for LP5523.
+echo 2 > /sys/bus/i2c/devices/xxxx/select_engine
+echo 1 > /sys/class/firmware/lp5523/loading
+echo "9d80400004ff05ff437f0000" > /sys/class/firmware/lp5523/data
+echo 0 > /sys/class/firmware/lp5523/loading
+echo 1 > /sys/bus/i2c/devices/xxxx/run_engine
+
+As soon as 'loading' is set to 0, registered callback is called.
+Inside the callback, the selected engine is loaded and memory is updated.
+To run programmed pattern, 'run_engine' attribute should be enabled.
+
+( 'run_engine' and 'firmware_cb' )
+The sequence of running the program data is common.
+But each device has own specific register addresses for commands.
+To support this, 'run_engine' and 'firmware_cb' are configurable in each driver.
+run_engine : Control the selected engine
+firmware_cb : The callback function after loading the firmware is done.
+ Chip specific commands for loading and updating program memory.