Merge tag 'leds_for_4.10' of git://git.kernel.org/pub/scm/linux/kerne…

…l/git/j.anaszewski/linux-leds

Pull LED updates from Jacek Anaszewski:

 - userspace LED class driver - it can be useful for testing triggers
   and can also be used to implement virtual LEDs

 - LED class driver for NIC78bx device

 - LED core fixes for preventing potential races while setting
   brightness when software blinking is enabled

 - improvements in LED documentation to mention semantics on changing
   brightness while trigger is active

* tag 'leds_for_4.10' of git://git.kernel.org/pub/scm/linux/kernel/git/j.anaszewski/linux-leds:
  leds: pca955x: Add ACPI support
  leds: netxbig: fix module autoload for OF registration
  leds: pca963x: Add ACPI support
  leds: leds-cobalt-raq: use builtin_platform_driver
  led: core: Fix blink_brightness setting race
  led: core: Use atomic bit-field for the blink-flags
  leds: Add user LED driver for NIC78bx device
  leds: verify vendor and change license in mlxcpld driver
  leds: pca963x: enable low-power state
  leds: pca9532: Use default trigger value from platform data
  leds: pca963x: workaround group blink scaling issue
  cleanup LED documentation and make it match reality
  leds: lp3952: Export I2C module alias information for module autoload
  leds: mc13783: Fix MC13892 keypad led access
  ledtrig-cpu.c: fix english
  leds/leds-lp5523.txt: make documentation match reality
  tools/leds: Add uledmon program for monitoring userspace LEDs
  leds: Use macro for max device node name size
  leds: Introduce userspace LED class driver
  mfd: qcom-pm8xxx: Clean up PM8XXX namespace

Documentation/ABI/testing/sysfs-class-led

@@ -4,24 +4,32 @@ KernelVersion:	2.6.17
 Contact:	Richard Purdie <rpurdie@rpsys.net>
 Description:
 		Set the brightness of the LED. Most LEDs don't
-		have hardware brightness support so will just be turned on for
+		have hardware brightness support, so will just be turned on for
 		non-zero brightness settings. The value is between 0 and
 		/sys/class/leds/<led>/max_brightness.
 
+		Writing 0 to this file clears active trigger.
+
+		Writing non-zero to this file while trigger is active changes the
+		top brightness trigger is going to use.
+
 What:		/sys/class/leds/<led>/max_brightness
 Date:		March 2006
 KernelVersion:	2.6.17
 Contact:	Richard Purdie <rpurdie@rpsys.net>
 Description:
-		Maximum brightness level for this led, default is 255 (LED_FULL).
+		Maximum brightness level for this LED, default is 255 (LED_FULL).
+
+		If the LED does not support different brightness levels, this
+		should be 1.
 
 What:		/sys/class/leds/<led>/trigger
 Date:		March 2006
 KernelVersion:	2.6.17
 Contact:	Richard Purdie <rpurdie@rpsys.net>
 Description:
 		Set the trigger for this LED. A trigger is a kernel based source
-		of led events.
+		of LED events.
 		You can change triggers in a similar manner to the way an IO
 		scheduler is chosen. Trigger specific parameters can appear in
 		/sys/class/leds/<led> once a given trigger is selected. For

Documentation/devicetree/bindings/leds/pca963x.txt

@@ -7,6 +7,9 @@ Optional properties:
 - nxp,totem-pole : use totem pole (push-pull) instead of open-drain (pca9632 defaults
   to open-drain, newer chips to totem pole)
 - nxp,hw-blink : use hardware blinking instead of software blinking
+- nxp,period-scale : In some configurations, the chip blinks faster than expected.
+		     This parameter provides a scaling ratio (fixed point, decimal divided
+		     by 1000) to compensate, e.g. 1300=1.3x and 750=0.75x.
 
 Each led is represented as a sub-node of the nxp,pca963x device.
 

Documentation/leds/leds-lp5523.txt

@@ -34,8 +34,8 @@ There are two ways to run LED patterns.
   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)
+  enginex_load : microcode load
+  enginex_leds : led mux control
 
   cd /sys/class/leds/lp5523:channel2/device
   echo "load" > engine3_mode

Documentation/leds/uleds.txt

@@ -0,0 +1,36 @@
+Userspace LEDs
+==============
+
+The uleds driver supports userspace LEDs. This can be useful for testing
+triggers and can also be used to implement virtual LEDs.
+
+
+Usage
+=====
+
+When the driver is loaded, a character device is created at /dev/uleds. To
+create a new LED class device, open /dev/uleds and write a uleds_user_dev
+structure to it (found in kernel public header file linux/uleds.h).
+
+    #define LED_MAX_NAME_SIZE 64
+
+    struct uleds_user_dev {
+        char name[LED_MAX_NAME_SIZE];
+    };
+
+A new LED class device will be created with the name given. The name can be
+any valid sysfs device node name, but consider using the LED class naming
+convention of "devicename:color:function".
+
+The current brightness is found by reading a single byte from the character
+device. Values are unsigned: 0 to 255. Reading will block until the brightness
+changes. The device node can also be polled to notify when the brightness value
+changes.
+
+The LED class device will be removed when the open file handle to /dev/uleds
+is closed.
+
+Multiple LED class devices are created by opening additional file handles to
+/dev/uleds.
+
+See tools/leds/uledmon.c for an example userspace program.

arch/arm/configs/multi_v7_defconfig

@@ -489,7 +489,7 @@ CONFIG_MFD_MAX8907=y
 CONFIG_MFD_MAX8997=y
 CONFIG_MFD_MAX8998=y
 CONFIG_MFD_RK808=y
-CONFIG_MFD_PM8921_CORE=y
+CONFIG_MFD_PM8XXX=y
 CONFIG_MFD_QCOM_RPM=y
 CONFIG_MFD_SPMI_PMIC=y
 CONFIG_MFD_SEC_CORE=y

arch/arm/configs/pxa_defconfig

@@ -411,7 +411,6 @@ CONFIG_MFD_MAX77693=y
 CONFIG_MFD_MAX8907=m
 CONFIG_EZX_PCAP=y
 CONFIG_UCB1400_CORE=m
-CONFIG_MFD_PM8921_CORE=m
 CONFIG_MFD_SEC_CORE=y
 CONFIG_MFD_PALMAS=y
 CONFIG_MFD_TPS65090=y

arch/arm/configs/qcom_defconfig

@@ -119,7 +119,6 @@ CONFIG_POWER_RESET=y
 CONFIG_POWER_RESET_MSM=y
 CONFIG_THERMAL=y
 CONFIG_MFD_PM8XXX=y
-CONFIG_MFD_PM8921_CORE=y
 CONFIG_MFD_QCOM_RPM=y
 CONFIG_MFD_SPMI_PMIC=y
 CONFIG_REGULATOR=y

drivers/leds/Kconfig

@@ -645,7 +645,7 @@ config LEDS_VERSATILE
 
 config LEDS_PM8058
 	tristate "LED Support for the Qualcomm PM8058 PMIC"
-	depends on MFD_PM8921_CORE
+	depends on MFD_PM8XXX
 	depends on LEDS_CLASS
 	help
 	  Choose this option if you want to use the LED drivers in
@@ -659,6 +659,25 @@ config LEDS_MLXCPLD
 	  This option enabled support for the LEDs on the Mellanox
 	  boards. Say Y to enabled these.
 
+config LEDS_USER
+	tristate "Userspace LED support"
+	depends on LEDS_CLASS
+	help
+	  This option enables support for userspace LEDs. Say 'y' to enable this
+	  support in kernel. To compile this driver as a module, choose 'm' here:
+	  the module will be called uleds.
+
+config LEDS_NIC78BX
+	tristate "LED support for NI PXI NIC78bx devices"
+	depends on LEDS_CLASS
+	depends on X86 && ACPI
+	help
+	  This option enables support for the User1 and User2 LEDs on NI
+	  PXI NIC78bx devices.
+
+	  To compile this driver as a module, choose M here: the module
+	  will be called leds-nic78bx.
+
 comment "LED Triggers"
 source "drivers/leds/trigger/Kconfig"
 

drivers/leds/Makefile

@@ -71,9 +71,13 @@ obj-$(CONFIG_LEDS_IS31FL319X)		+= leds-is31fl319x.o
 obj-$(CONFIG_LEDS_IS31FL32XX)		+= leds-is31fl32xx.o
 obj-$(CONFIG_LEDS_PM8058)		+= leds-pm8058.o
 obj-$(CONFIG_LEDS_MLXCPLD)		+= leds-mlxcpld.o
+obj-$(CONFIG_LEDS_NIC78BX)		+= leds-nic78bx.o
 
 # LED SPI Drivers
 obj-$(CONFIG_LEDS_DAC124S085)		+= leds-dac124s085.o
 
+# LED Userspace Drivers
+obj-$(CONFIG_LEDS_USER)			+= uleds.o
+
 # LED Triggers
 obj-$(CONFIG_LEDS_TRIGGERS)		+= trigger/

drivers/leds/led-class.c

@@ -20,6 +20,7 @@
 #include <linux/slab.h>
 #include <linux/spinlock.h>
 #include <linux/timer.h>
+#include <uapi/linux/uleds.h>
 #include "leds.h"
 
 static struct class *leds_class;
@@ -187,7 +188,7 @@ static int led_classdev_next_name(const char *init_name, char *name,
  */
 int led_classdev_register(struct device *parent, struct led_classdev *led_cdev)
 {
-	char name[64];
+	char name[LED_MAX_NAME_SIZE];
 	int ret;
 
 	ret = led_classdev_next_name(led_cdev->name, name, sizeof(name));
@@ -203,6 +204,7 @@ int led_classdev_register(struct device *parent, struct led_classdev *led_cdev)
 		dev_warn(parent, "Led %s renamed to %s due to name collision",
 				led_cdev->name, dev_name(led_cdev->dev));
 
+	led_cdev->work_flags = 0;
 #ifdef CONFIG_LEDS_TRIGGERS
 	init_rwsem(&led_cdev->trigger_lock);
 #endif

drivers/leds/led-core.c

@@ -53,30 +53,30 @@ static void led_timer_function(unsigned long data)
 
 	if (!led_cdev->blink_delay_on || !led_cdev->blink_delay_off) {
 		led_set_brightness_nosleep(led_cdev, LED_OFF);
-		led_cdev->flags &= ~LED_BLINK_SW;
+		clear_bit(LED_BLINK_SW, &led_cdev->work_flags);
 		return;
 	}
 
-	if (led_cdev->flags & LED_BLINK_ONESHOT_STOP) {
-		led_cdev->flags &=  ~(LED_BLINK_ONESHOT_STOP | LED_BLINK_SW);
+	if (test_and_clear_bit(LED_BLINK_ONESHOT_STOP,
+			       &led_cdev->work_flags)) {
+		clear_bit(LED_BLINK_SW, &led_cdev->work_flags);
 		return;
 	}
 
 	brightness = led_get_brightness(led_cdev);
 	if (!brightness) {
 		/* Time to switch the LED on. */
-		brightness = led_cdev->blink_brightness;
+		if (test_and_clear_bit(LED_BLINK_BRIGHTNESS_CHANGE,
+					&led_cdev->work_flags))
+			brightness = led_cdev->new_blink_brightness;
+		else
+			brightness = led_cdev->blink_brightness;
 		delay = led_cdev->blink_delay_on;
 	} else {
 		/* Store the current brightness value to be able
 		 * to restore it when the delay_off period is over.
-		 * Do it only if there is no pending blink brightness
-		 * change, to avoid overwriting the new value.
 		 */
-		if (!(led_cdev->flags & LED_BLINK_BRIGHTNESS_CHANGE))
-			led_cdev->blink_brightness = brightness;
-		else
-			led_cdev->flags &= ~LED_BLINK_BRIGHTNESS_CHANGE;
+		led_cdev->blink_brightness = brightness;
 		brightness = LED_OFF;
 		delay = led_cdev->blink_delay_off;
 	}
@@ -87,13 +87,15 @@ static void led_timer_function(unsigned long data)
 	 * the final blink state so that the led is toggled each delay_on +
 	 * delay_off milliseconds in worst case.
 	 */
-	if (led_cdev->flags & LED_BLINK_ONESHOT) {
-		if (led_cdev->flags & LED_BLINK_INVERT) {
+	if (test_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags)) {
+		if (test_bit(LED_BLINK_INVERT, &led_cdev->work_flags)) {
 			if (brightness)
-				led_cdev->flags |= LED_BLINK_ONESHOT_STOP;
+				set_bit(LED_BLINK_ONESHOT_STOP,
+					&led_cdev->work_flags);
 		} else {
 			if (!brightness)
-				led_cdev->flags |= LED_BLINK_ONESHOT_STOP;
+				set_bit(LED_BLINK_ONESHOT_STOP,
+					&led_cdev->work_flags);
 		}
 	}
 
@@ -106,10 +108,9 @@ static void set_brightness_delayed(struct work_struct *ws)
 		container_of(ws, struct led_classdev, set_brightness_work);
 	int ret = 0;
 
-	if (led_cdev->flags & LED_BLINK_DISABLE) {
+	if (test_and_clear_bit(LED_BLINK_DISABLE, &led_cdev->work_flags)) {
 		led_cdev->delayed_set_value = LED_OFF;
 		led_stop_software_blink(led_cdev);
-		led_cdev->flags &= ~LED_BLINK_DISABLE;
 	}
 
 	ret = __led_set_brightness(led_cdev, led_cdev->delayed_set_value);
@@ -152,7 +153,7 @@ static void led_set_software_blink(struct led_classdev *led_cdev,
 		return;
 	}
 
-	led_cdev->flags |= LED_BLINK_SW;
+	set_bit(LED_BLINK_SW, &led_cdev->work_flags);
 	mod_timer(&led_cdev->blink_timer, jiffies + 1);
 }
 
@@ -161,7 +162,7 @@ static void led_blink_setup(struct led_classdev *led_cdev,
 		     unsigned long *delay_on,
 		     unsigned long *delay_off)
 {
-	if (!(led_cdev->flags & LED_BLINK_ONESHOT) &&
+	if (!test_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags) &&
 	    led_cdev->blink_set &&
 	    !led_cdev->blink_set(led_cdev, delay_on, delay_off))
 		return;
@@ -188,8 +189,8 @@ void led_blink_set(struct led_classdev *led_cdev,
 {
 	del_timer_sync(&led_cdev->blink_timer);
 
-	led_cdev->flags &= ~LED_BLINK_ONESHOT;
-	led_cdev->flags &= ~LED_BLINK_ONESHOT_STOP;
+	clear_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags);
+	clear_bit(LED_BLINK_ONESHOT_STOP, &led_cdev->work_flags);
 
 	led_blink_setup(led_cdev, delay_on, delay_off);
 }
@@ -200,17 +201,17 @@ void led_blink_set_oneshot(struct led_classdev *led_cdev,
 			   unsigned long *delay_off,
 			   int invert)
 {
-	if ((led_cdev->flags & LED_BLINK_ONESHOT) &&
+	if (test_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags) &&
 	     timer_pending(&led_cdev->blink_timer))
 		return;
 
-	led_cdev->flags |= LED_BLINK_ONESHOT;
-	led_cdev->flags &= ~LED_BLINK_ONESHOT_STOP;
+	set_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags);
+	clear_bit(LED_BLINK_ONESHOT_STOP, &led_cdev->work_flags);
 
 	if (invert)
-		led_cdev->flags |= LED_BLINK_INVERT;
+		set_bit(LED_BLINK_INVERT, &led_cdev->work_flags);
 	else
-		led_cdev->flags &= ~LED_BLINK_INVERT;
+		clear_bit(LED_BLINK_INVERT, &led_cdev->work_flags);
 
 	led_blink_setup(led_cdev, delay_on, delay_off);
 }
@@ -221,7 +222,7 @@ void led_stop_software_blink(struct led_classdev *led_cdev)
 	del_timer_sync(&led_cdev->blink_timer);
 	led_cdev->blink_delay_on = 0;
 	led_cdev->blink_delay_off = 0;
-	led_cdev->flags &= ~LED_BLINK_SW;
+	clear_bit(LED_BLINK_SW, &led_cdev->work_flags);
 }
 EXPORT_SYMBOL_GPL(led_stop_software_blink);
 
@@ -232,18 +233,19 @@ void led_set_brightness(struct led_classdev *led_cdev,
 	 * If software blink is active, delay brightness setting
 	 * until the next timer tick.
 	 */
-	if (led_cdev->flags & LED_BLINK_SW) {
+	if (test_bit(LED_BLINK_SW, &led_cdev->work_flags)) {
 		/*
 		 * If we need to disable soft blinking delegate this to the
 		 * work queue task to avoid problems in case we are called
 		 * from hard irq context.
 		 */
 		if (brightness == LED_OFF) {
-			led_cdev->flags |= LED_BLINK_DISABLE;
+			set_bit(LED_BLINK_DISABLE, &led_cdev->work_flags);
 			schedule_work(&led_cdev->set_brightness_work);
 		} else {
-			led_cdev->flags |= LED_BLINK_BRIGHTNESS_CHANGE;
-			led_cdev->blink_brightness = brightness;
+			set_bit(LED_BLINK_BRIGHTNESS_CHANGE,
+				&led_cdev->work_flags);
+			led_cdev->new_blink_brightness = brightness;
 		}
 		return;
 	}

drivers/leds/leds-cobalt-raq.c

@@ -115,8 +115,4 @@ static struct platform_driver cobalt_raq_led_driver = {
 	},
 };
 
-static int __init cobalt_raq_led_init(void)
-{
-	return platform_driver_register(&cobalt_raq_led_driver);
-}
-device_initcall(cobalt_raq_led_init);
+builtin_platform_driver(cobalt_raq_led_driver);

drivers/leds/leds-lp3952.c

@@ -274,6 +274,7 @@ static const struct i2c_device_id lp3952_id[] = {
 	{LP3952_NAME, 0},
 	{}
 };
+MODULE_DEVICE_TABLE(i2c, lp3952_id);
 
 #ifdef CONFIG_ACPI
 static const struct acpi_device_id lp3952_acpi_match[] = {

drivers/leds/leds-mc13783.c

@@ -84,8 +84,9 @@ static int mc13xxx_led_set(struct led_classdev *led_cdev,
 	case MC13892_LED_MD:
 	case MC13892_LED_AD:
 	case MC13892_LED_KP:
-		reg = (led->id - MC13892_LED_MD) / 2;
-		shift = 3 + (led->id - MC13892_LED_MD) * 12;
+		off = led->id - MC13892_LED_MD;
+		reg = off / 2;
+		shift = 3 + (off - reg * 2) * 12;
 		break;
 	case MC13892_LED_R:
 	case MC13892_LED_G:

drivers/leds/leds-mlxcpld.c

@@ -400,6 +400,9 @@ static int __init mlxcpld_led_init(void)
 	struct platform_device *pdev;
 	int err;
 
+	if (!dmi_match(DMI_CHASSIS_VENDOR, "Mellanox Technologies Ltd."))
+		return -ENODEV;
+
 	pdev = platform_device_register_simple(KBUILD_MODNAME, -1, NULL, 0);
 	if (IS_ERR(pdev)) {
 		pr_err("Device allocation failed\n");
@@ -426,5 +429,5 @@ module_exit(mlxcpld_led_exit);
 
 MODULE_AUTHOR("Vadim Pasternak <vadimp@mellanox.com>");
 MODULE_DESCRIPTION("Mellanox board LED driver");
-MODULE_LICENSE("GPL v2");
+MODULE_LICENSE("Dual BSD/GPL");
 MODULE_ALIAS("platform:leds_mlxcpld");