Merge tag 'leds-for-5.2-rc1' of...

Merge tag 'leds-for-5.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/j.anaszewski/linux-leds

Pull LED updates from Jacek Anaszewski:
 "LED core fixes and improvements:

      - avoid races with workqueue
      - Kconfig: pedantic cleanup
      - small fixes for Flash class description

  leds-lt3593:

      - remove unneeded assignment in lt3593_led_probe
      - drop pdata handling code

  leds-blinkm:

      - clean up double assignment to data->i2c_addr

  leds-pca955x, leds-pca963x:

      - revert ACPI support, as it turned out that there is no evidence
          of officially registered ACPI IDs for these devices.
      - make use of device property API

  leds-as3645a:

      - switch to fwnode property API

  LED related addition to ACPI documentation:

      - document how to refer to LEDs from remote nodes

  LED related fix to ALSA line6/toneport driver:

      - avoid polluting led_* namespace

  And lm3532 driver relocation from MFD to LED subsystem, accompanied by
  various improvements and optimizations; it entails also a change in
  omap4-droid4-xt894.dts:

      - leds: lm3532: Introduce the lm3532 LED driver
      - mfd: ti-lmu: Remove LM3532 backlight driver references
      - ARM: dts: omap4-droid4: Update backlight dt properties
      - dt: lm3532: Add lm3532 dt doc and update ti_lmu doc"

* tag 'leds-for-5.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/j.anaszewski/linux-leds:
  leds: avoid races with workqueue
  ALSA: line6: Avoid polluting led_* namespace
  leds: lm3532: Introduce the lm3532 LED driver
  mfd: ti-lmu: Remove LM3532 backlight driver references
  ARM: dts: omap4-droid4: Update backlight dt properties
  dt: lm3532: Add lm3532 dt doc and update ti_lmu doc
  leds: Small fixes for Flash class description
  leds: blinkm: clean up double assignment to data->i2c_addr
  leds: pca963x: Make use of device property API
  leds: pca955x: Make use of device property API
  leds: lt3593: Remove unneeded assignment in lt3593_led_probe
  leds: lt3593: drop pdata handling code
  leds: pca955x: Revert "Add ACPI support"
  leds: pca963x: Revert "Add ACPI support"
  drivers: leds: Kconfig: pedantic cleanups
  ACPI: Document how to refer to LEDs from remote nodes
  leds: as3645a: Switch to fwnode property API

Documentation/acpi/dsd/leds.txt

+Describing and referring to LEDs in ACPI
+
+Individual LEDs are described by hierarchical data extension [6] nodes under the
+device node, the LED driver chip. The "reg" property in the LED specific nodes
+tells the numerical ID of each individual LED output to which the LEDs are
+connected. [3] The hierarchical data nodes are named "led@X", where X is the
+number of the LED output.
+
+Referring to LEDs in Device tree is documented in [4], in "flash-leds" property
+documentation. In short, LEDs are directly referred to by using phandles.
+
+While Device tree allows referring to any node in the tree[1], in ACPI
+references are limited to device nodes only [2]. For this reason using the same
+mechanism on ACPI is not possible. A mechanism to refer to non-device ACPI nodes
+is documented in [7].
+
+ACPI allows (as does DT) using integer arguments after the reference. A
+combination of the LED driver device reference and an integer argument,
+referring to the "reg" property of the relevant LED, is used to identify
+individual LEDs. The value of the "reg" property is a contract between the
+firmware and software, it uniquely identifies the LED driver outputs.
+
+Under the LED driver device, The first hierarchical data extension package list
+entry shall contain the string "led@" followed by the number of the LED,
+followed by the referred object name. That object shall be named "LED" followed
+by the number of the LED.
+
+An ASL example of a camera sensor device and a LED driver device for two LEDs.
+Objects not relevant for LEDs or the references to them have been omitted.
+
+	Device (LED)
+	{
+		Name (_DSD, Package () {
+			ToUUID("dbb8e3e6-5886-4ba6-8795-1319f52a966b"),
+			Package () {
+				Package () { "led@0", LED0 },
+				Package () { "led@1", LED1 },
+			}
+		})
+		Name (LED0, Package () {
+			ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
+			Package () {
+				Package () { "reg", 0 },
+				Package () { "flash-max-microamp", 1000000 },
+				Package () { "flash-timeout-us", 200000 },
+				Package () { "led-max-microamp", 100000 },
+				Package () { "label", "white:flash" },
+			}
+		})
+		Name (LED1, Package () {
+			ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
+			Package () {
+				Package () { "reg", 1 },
+				Package () { "led-max-microamp", 10000 },
+				Package () { "label", "red:indicator" },
+			}
+		})
+	}
+
+	Device (SEN)
+	{
+		Name (_DSD, Package () {
+			ToUUID("daffd814-6eba-4d8c-8a91-bc9bbf4aa301"),
+			Package () {
+				Package () {
+					"flash-leds",
+					Package () { ^LED, "led@0", ^LED, "led@1" },
+				}
+			}
+		})
+	}
+
+where
+
+	LED	LED driver device
+	LED0	First LED
+	LED1	Second LED
+	SEN	Camera sensor device (or another device the LED is
+		related to)
+
+[1] Device tree. <URL:http://www.devicetree.org>, referenced 2019-02-21.
+
+[2] Advanced Configuration and Power Interface Specification.
+    <URL:https://uefi.org/sites/default/files/resources/ACPI_6_3_final_Jan30.pdf>,
+    referenced 2019-02-21.
+
+[3] Documentation/devicetree/bindings/leds/common.txt
+
+[4] Documentation/devicetree/bindings/media/video-interfaces.txt
+
+[5] Device Properties UUID For _DSD.
+    <URL:http://www.uefi.org/sites/default/files/resources/_DSD-device-properties-UUID.pdf>,
+    referenced 2019-02-21.
+
+[6] Hierarchical Data Extension UUID For _DSD.
+    <URL:http://www.uefi.org/sites/default/files/resources/_DSD-hierarchical-data-extension-UUID-v1.1.pdf>,
+    referenced 2019-02-21.
+
+[7] Documentation/acpi/dsd/data-node-reference.txt

Documentation/devicetree/bindings/leds/leds-lm3532.txt

+* Texas Instruments - lm3532 White LED driver with ambient light sensing
+capability.
+
+The LM3532 provides the 3 high-voltage, low-side current sinks. The device is
+programmable over an I2C-compatible interface and has independent
+current control for all three channels. The adaptive current regulation
+method allows for different LED currents in each current sink thus allowing
+for a wide variety of backlight and keypad applications.
+
+The main features of the LM3532 include dual ambient light sensor inputs
+each with 32 internal voltage setting resistors, 8-bit logarithmic and linear
+brightness control, dual external PWM brightness control inputs, and up to
+1000:1 dimming ratio with programmable fade in and fade out settings.
+
+Required properties:
+	- compatible : "ti,lm3532"
+	- reg : I2C slave address
+	- #address-cells : 1
+	- #size-cells : 0
+
+Optional properties:
+	- enable-gpios : gpio pin to enable (active high)/disable the device.
+	- ramp-up-us - The Run time ramp rates/step are from one current
+		       set-point to another after the device has reached its
+		       initial target set point from turn-on
+	- ramp-down-us - The Run time ramp rates/step are from one current
+			 set-point to another after the device has reached its
+			 initial target set point from turn-on
+	Range for ramp settings: 8us - 65536us
+
+Optional properties if ALS mode is used:
+	- ti,als-vmin - Minimum ALS voltage defined in Volts
+	- ti,als-vmax - Maximum ALS voltage defined in Volts
+	Per the data sheet the max ALS voltage is 2V and the min is 0V
+
+	- ti,als1-imp-sel - ALS1 impedance resistor selection in Ohms
+	- ti,als2-imp-sel - ALS2 impedance resistor selection in Ohms
+	Range for impedance select: 37000 Ohms - 1190 Ohms
+	Values above 37kohms will be set to the "High Impedance" setting
+
+	- ti,als-avrg-time-us - Determines the length of time the device needs to
+			  average the two ALS inputs.  This is only used if
+			  the input mode is LM3532_ALS_INPUT_AVRG.
+			     Range: 17920us - 2293760us
+	- ti,als-input-mode - Determines how the device uses the attached ALS
+			   devices.
+			   0x00 - ALS1 and ALS2 input average
+			   0x01 - ALS1 Input
+			   0x02 - ALS2 Input
+			   0x03 - Max of ALS1 and ALS2
+
+Required child properties:
+	- reg : Indicates control bank the LED string is controlled by
+	- led-sources : see Documentation/devicetree/bindings/leds/common.txt
+	- ti,led-mode : Defines if the LED strings are manually controlled or
+			if the LED strings are controlled by the ALS.
+			0x00 - LED strings are I2C controlled via full scale
+			       brightness control register
+			0x01 - LED strings are ALS controlled
+
+Optional LED child properties:
+	- label : see Documentation/devicetree/bindings/leds/common.txt
+	- linux,default-trigger :
+	   see Documentation/devicetree/bindings/leds/common.txt
+
+Example:
+led-controller@38 {
+	compatible = "ti,lm3532";
+	#address-cells = <1>;
+	#size-cells = <0>;
+	reg = <0x38>;
+
+	enable-gpios = <&gpio6 12 GPIO_ACTIVE_HIGH>;
+	ramp-up-us = <1024>;
+	ramp-down-us = <65536>;
+
+	ti,als-vmin = <0>;
+	ti,als-vmax = <2000>;
+	ti,als1-imp-sel = <4110>;
+	ti,als2-imp-sel = <2180>;
+	ti,als-avrg-time-us = <17920>;
+	ti,als-input-mode = <0x00>;
+
+	led@0 {
+		reg = <0>;
+		led-sources = <2>;
+		ti,led-mode = <1>;
+		label = ":backlight";
+		linux,default-trigger = "backlight";
+	};
+
+	led@1 {
+		reg = <1>;
+		led-sources = <1>;
+		ti,led-mode = <0>;
+		label = ":kbd_backlight";
+	};
+};
+
+For more product information please see the links below:
+http://www.ti.com/product/LM3532

Documentation/devicetree/bindings/mfd/ti-lmu.txt

@@ -4,7 +4,6 @@ TI LMU driver supports lighting devices below.
 
    Name                  Child nodes
   ------      ---------------------------------
-  LM3532       Backlight
   LM3631       Backlight and regulator
   LM3632       Backlight and regulator
   LM3633       Backlight, LED and fault monitor
@@ -13,7 +12,6 @@ TI LMU driver supports lighting devices below.
 
 Required properties:
   - compatible: Should be one of:
-                "ti,lm3532"
                 "ti,lm3631"
                 "ti,lm3632"
                 "ti,lm3633"
@@ -23,7 +21,6 @@ Required properties:
          0x11 for LM3632
          0x29 for LM3631
          0x36 for LM3633, LM3697
-         0x38 for LM3532
          0x63 for LM3695
 
 Optional property:
@@ -47,23 +44,6 @@ Optional nodes:
 [2] ../leds/leds-lm3633.txt
 [3] ../regulator/lm363x-regulator.txt
 
-lm3532@38 {
-	compatible = "ti,lm3532";
-	reg = <0x38>;
-
-	enable-gpios = <&pioC 2 GPIO_ACTIVE_HIGH>;
-
-	backlight {
-		compatible = "ti,lm3532-backlight";
-
-		lcd {
-			led-sources = <0 1 2>;
-			ramp-up-msec = <30>;
-			ramp-down-msec = <0>;
-		};
-	};
-};
-
 lm3631@29 {
 	compatible = "ti,lm3631";
 	reg = <0x29>;

arch/arm/boot/dts/omap4-droid4-xt894.dts

@@ -214,7 +214,6 @@ lcd0: display {
 
 		width-mm = <50>;
 		height-mm = <89>;
-		backlight = <&lcd_backlight>;
 
 		panel-timing {
 			clock-frequency = <0>;		/* Calculated by dsi */
@@ -383,20 +382,30 @@ wlcore: wlcore@2 {
 };
 
 &i2c1 {
-	lm3532@38 {
+	led-controller@38 {
 		compatible = "ti,lm3532";
+		#address-cells = <1>;
+		#size-cells = <0>;
 		reg = <0x38>;
 
 		enable-gpios = <&gpio6 12 GPIO_ACTIVE_HIGH>;
 
-		lcd_backlight: backlight {
-			compatible = "ti,lm3532-backlight";
+		ramp-up-us = <1024>;
+		ramp-down-us = <8193>;
 
-			lcd {
-				led-sources = <0 1 2>;
-				ramp-up-msec = <1>;
-				ramp-down-msec = <0>;
+		led@0 {
+			reg = <0>;
+			led-sources = <2>;
+			ti,led-mode = <0>;
+			label = ":backlight";
+			linux,default-trigger = "backlight";
 		};
+
+		led@1 {
+			reg = <1>;
+			led-sources = <1>;
+			ti,led-mode = <0>;
+			label = ":kbd_backlight";
 		};
 	};
 };

drivers/leds/Kconfig

@@ -23,8 +23,8 @@ config LEDS_CLASS_FLASH
 	tristate "LED Flash Class Support"
 	depends on LEDS_CLASS
 	help
-	  This option enables the flash led sysfs class in /sys/class/leds.
-	  It wrapps LED Class and adds flash LEDs specific sysfs attributes
+	  This option enables the flash LED sysfs class in /sys/class/leds.
+	  It wraps LED Class and adds flash LEDs specific sysfs attributes
 	  and kernel internal API to it. You'll need this to provide support
 	  for the flash related features of a LED device. It can be built
 	  as a module.
@@ -138,6 +138,16 @@ config LEDS_LM3530
 	  controlled manually or using PWM input or using ambient
 	  light automatically.
 
+config LEDS_LM3532
+	tristate "LCD Backlight driver for LM3532"
+	depends on LEDS_CLASS
+	depends on I2C
+	help
+	  This option enables support for the LCD backlight using
+	  LM3532 ambient light sensor chip. This ALS chip can be
+	  controlled manually or using PWM input or using ambient
+	  light automatically.
+
 config LEDS_LM3533
 	tristate "LED support for LM3533"
 	depends on LEDS_CLASS
@@ -533,6 +543,7 @@ config LEDS_LT3593
 	tristate "LED driver for LT3593 controllers"
 	depends on LEDS_CLASS
 	depends on GPIOLIB || COMPILE_TEST
+	depends on OF
 	help
 	  This option enables support for LEDs driven by a Linear Technology
 	  LT3593 controller. This controller uses a special one-wire pulse

drivers/leds/Makefile

@@ -18,6 +18,7 @@ obj-$(CONFIG_LEDS_BD2802)		+= leds-bd2802.o
 obj-$(CONFIG_LEDS_CPCAP)		+= leds-cpcap.o
 obj-$(CONFIG_LEDS_LOCOMO)		+= leds-locomo.o
 obj-$(CONFIG_LEDS_LM3530)		+= leds-lm3530.o
+obj-$(CONFIG_LEDS_LM3532)		+= leds-lm3532.o
 obj-$(CONFIG_LEDS_LM3533)		+= leds-lm3533.o
 obj-$(CONFIG_LEDS_LM3642)		+= leds-lm3642.o
 obj-$(CONFIG_LEDS_MIKROTIK_RB532)	+= leds-rb532.o

drivers/leds/led-class.c

@@ -57,6 +57,7 @@ static ssize_t brightness_store(struct device *dev,
 	if (state == LED_OFF)
 		led_trigger_remove(led_cdev);
 	led_set_brightness(led_cdev, state);
+	flush_work(&led_cdev->set_brightness_work);
 
 	ret = size;
 unlock:

drivers/leds/led-core.c

@@ -164,6 +164,11 @@ static void led_blink_setup(struct led_classdev *led_cdev,
 		     unsigned long *delay_on,
 		     unsigned long *delay_off)
 {
+	/*
+	 * If "set brightness to 0" is pending in workqueue, we don't
+	 * want that to be reordered after blink_set()
+	 */
+	flush_work(&led_cdev->set_brightness_work);
 	if (!test_bit(LED_BLINK_ONESHOT, &led_cdev->work_flags) &&
 	    led_cdev->blink_set &&
 	    !led_cdev->blink_set(led_cdev, delay_on, delay_off))

drivers/leds/leds-as3645a.c

@@ -25,7 +25,7 @@
 #include <linux/leds.h>
 #include <linux/module.h>
 #include <linux/mutex.h>
-#include <linux/of.h>
+#include <linux/property.h>
 #include <linux/slab.h>
 
 #include <media/v4l2-flash-led-class.h>
@@ -148,8 +148,8 @@ struct as3645a {
 	struct v4l2_flash *vf;
 	struct v4l2_flash *vfind;
 
-	struct device_node *flash_node;
-	struct device_node *indicator_node;
+	struct fwnode_handle *flash_node;
+	struct fwnode_handle *indicator_node;
 
 	struct as3645a_config cfg;
 
@@ -493,30 +493,31 @@ static int as3645a_detect(struct as3645a *flash)
 
 static int as3645a_parse_node(struct as3645a *flash,
 			      struct as3645a_names *names,
-			      struct device_node *node)
+			      struct fwnode_handle *fwnode)
 {
 	struct as3645a_config *cfg = &flash->cfg;
-	struct device_node *child;
+	struct fwnode_handle *child;
 	const char *name;
 	int rval;
 
-	for_each_child_of_node(node, child) {
+	fwnode_for_each_child_node(fwnode, child) {
 		u32 id = 0;
 
-		of_property_read_u32(child, "reg", &id);
+		fwnode_property_read_u32(child, "reg", &id);
 
 		switch (id) {
 		case AS_LED_FLASH:
-			flash->flash_node = of_node_get(child);
+			flash->flash_node = child;
 			break;
 		case AS_LED_INDICATOR:
-			flash->indicator_node = of_node_get(child);
+			flash->indicator_node = child;
 			break;
 		default:
 			dev_warn(&flash->client->dev,
 				 "unknown LED %u encountered, ignoring\n", id);
 			break;
 		}
+		fwnode_handle_get(child);
 	}
 
 	if (!flash->flash_node) {
@@ -524,14 +525,18 @@ static int as3645a_parse_node(struct as3645a *flash,
 		return -ENODEV;
 	}
 
-	rval = of_property_read_string(flash->flash_node, "label", &name);
-	if (!rval)
+	rval = fwnode_property_read_string(flash->flash_node, "label", &name);
+	if (!rval) {
 		strlcpy(names->flash, name, sizeof(names->flash));
-	else
+	} else if (is_of_node(fwnode)) {
 		snprintf(names->flash, sizeof(names->flash),
-			 "%pOFn:flash", node);
+			 "%pOFn:flash", to_of_node(fwnode));
+	} else {
+		dev_err(&flash->client->dev, "flash node has no label!\n");
+		return -EINVAL;
+	}
 
-	rval = of_property_read_u32(flash->flash_node, "flash-timeout-us",
+	rval = fwnode_property_read_u32(flash->flash_node, "flash-timeout-us",
 					&cfg->flash_timeout_us);
 	if (rval < 0) {
 		dev_err(&flash->client->dev,
@@ -539,7 +544,7 @@ static int as3645a_parse_node(struct as3645a *flash,
 		goto out_err;
 	}
 
-	rval = of_property_read_u32(flash->flash_node, "flash-max-microamp",
+	rval = fwnode_property_read_u32(flash->flash_node, "flash-max-microamp",
 					&cfg->flash_max_ua);
 	if (rval < 0) {
 		dev_err(&flash->client->dev,
@@ -547,7 +552,7 @@ static int as3645a_parse_node(struct as3645a *flash,
 		goto out_err;
 	}
 
-	rval = of_property_read_u32(flash->flash_node, "led-max-microamp",
+	rval = fwnode_property_read_u32(flash->flash_node, "led-max-microamp",
 					&cfg->assist_max_ua);
 	if (rval < 0) {
 		dev_err(&flash->client->dev,
@@ -555,10 +560,10 @@ static int as3645a_parse_node(struct as3645a *flash,
 		goto out_err;
 	}
 
-	of_property_read_u32(flash->flash_node, "voltage-reference",
+	fwnode_property_read_u32(flash->flash_node, "voltage-reference",
 				 &cfg->voltage_reference);
 
-	of_property_read_u32(flash->flash_node, "ams,input-max-microamp",
+	fwnode_property_read_u32(flash->flash_node, "ams,input-max-microamp",
 				 &cfg->peak);
 	cfg->peak = AS_PEAK_mA_TO_REG(cfg->peak);
 
@@ -568,14 +573,20 @@ static int as3645a_parse_node(struct as3645a *flash,
 		goto out_err;
 	}
 
-	rval = of_property_read_string(flash->indicator_node, "label", &name);
-	if (!rval)
+	rval = fwnode_property_read_string(flash->indicator_node, "label",
+					   &name);
+	if (!rval) {
 		strlcpy(names->indicator, name, sizeof(names->indicator));
-	else
+	} else if (is_of_node(fwnode)) {
 		snprintf(names->indicator, sizeof(names->indicator),
-			 "%pOFn:indicator", node);
+			 "%pOFn:indicator", to_of_node(fwnode));
+	} else {
+		dev_err(&flash->client->dev, "indicator node has no label!\n");
+		return -EINVAL;
+	}
 
-	rval = of_property_read_u32(flash->indicator_node, "led-max-microamp",
+	rval = fwnode_property_read_u32(flash->indicator_node,
+					"led-max-microamp",
 					&cfg->indicator_max_ua);
 	if (rval < 0) {
 		dev_err(&flash->client->dev,
@@ -586,8 +597,8 @@ static int as3645a_parse_node(struct as3645a *flash,
 	return 0;
 
 out_err:
-	of_node_put(flash->flash_node);
-	of_node_put(flash->indicator_node);
+	fwnode_handle_put(flash->flash_node);
+	fwnode_handle_put(flash->indicator_node);
 
 	return rval;
 }
@@ -668,14 +679,14 @@ static int as3645a_v4l2_setup(struct as3645a *flash)
 	strlcpy(cfgind.dev_name, flash->iled_cdev.name, sizeof(cfg.dev_name));
 
 	flash->vf = v4l2_flash_init(
-		&flash->client->dev, of_fwnode_handle(flash->flash_node),
-		&flash->fled, NULL, &cfg);
+		&flash->client->dev, flash->flash_node, &flash->fled, NULL,
+		&cfg);
 	if (IS_ERR(flash->vf))
 		return PTR_ERR(flash->vf);
 
 	flash->vfind = v4l2_flash_indicator_init(
-		&flash->client->dev, of_fwnode_handle(flash->indicator_node),
-		&flash->iled_cdev, &cfgind);
+		&flash->client->dev, flash->indicator_node, &flash->iled_cdev,
+		&cfgind);
 	if (IS_ERR(flash->vfind)) {
 		v4l2_flash_release(flash->vf);
 		return PTR_ERR(flash->vfind);
@@ -690,7 +701,7 @@ static int as3645a_probe(struct i2c_client *client)
 	struct as3645a *flash;
 	int rval;
 
-	if (client->dev.of_node == NULL)
+	if (!dev_fwnode(&client->dev))
 		return -ENODEV;
 
 	flash = devm_kzalloc(&client->dev, sizeof(*flash), GFP_KERNEL);
@@ -699,7 +710,7 @@ static int as3645a_probe(struct i2c_client *client)
 
 	flash->client = client;
 
-	rval = as3645a_parse_node(flash, &names, client->dev.of_node);
+	rval = as3645a_parse_node(flash, &names, dev_fwnode(&client->dev));
 	if (rval < 0)
 		return rval;
 
@@ -731,8 +742,8 @@ static int as3645a_probe(struct i2c_client *client)
 	mutex_destroy(&flash->mutex);
 
 out_put_nodes:
-	of_node_put(flash->flash_node);
-	of_node_put(flash->indicator_node);
+	fwnode_handle_put(flash->flash_node);
+	fwnode_handle_put(flash->indicator_node);
 
 	return rval;
 }
@@ -751,8 +762,8 @@ static int as3645a_remove(struct i2c_client *client)
 
 	mutex_destroy(&flash->mutex);
 
-	of_node_put(flash->flash_node);
-	of_node_put(flash->indicator_node);
+	fwnode_handle_put(flash->flash_node);
+	fwnode_handle_put(flash->indicator_node);
 
 	return 0;
 }

drivers/leds/leds-blinkm.c

@@ -594,7 +594,6 @@ static int blinkm_probe(struct i2c_client *client,
 		goto exit;
 	}
 
-	data->i2c_addr = 0x09;
 	data->i2c_addr = 0x08;
 	/* i2c addr  - use fake addr of 0x08 initially (real is 0x09) */
 	data->fw_ver = 0xfe;

drivers/leds/leds-lm3532.c

+// SPDX-License-Identifier: GPL-2.0
+// TI LM3532 LED driver
+// Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com/
+
+#include <linux/i2c.h>
+#include <linux/leds.h>
+#include <linux/slab.h>
+#include <linux/regmap.h>
+#include <linux/types.h>
+#include <linux/regulator/consumer.h>
+#include <linux/module.h>
+#include <uapi/linux/uleds.h>
+#include <linux/gpio/consumer.h>
+
+#define LM3532_NAME "lm3532-led"
+#define LM3532_BL_MODE_MANUAL	0x00
+#define LM3532_BL_MODE_ALS	0x01
+
+#define LM3532_REG_OUTPUT_CFG	0x10
+#define LM3532_REG_STARTSHUT_RAMP	0x11
+#define LM3532_REG_RT_RAMP	0x12
+#define LM3532_REG_PWM_A_CFG	0x13
+#define LM3532_REG_PWM_B_CFG	0x14
+#define LM3532_REG_PWM_C_CFG	0x15
+#define LM3532_REG_ZONE_CFG_A	0x16
+#define LM3532_REG_CTRL_A_BRT	0x17
+#define LM3532_REG_ZONE_CFG_B	0x18
+#define LM3532_REG_CTRL_B_BRT	0x19
+#define LM3532_REG_ZONE_CFG_C	0x1a
+#define LM3532_REG_CTRL_C_BRT	0x1b
+#define LM3532_REG_ENABLE	0x1d
+#define LM3532_ALS_CONFIG	0x23
+#define LM3532_REG_ZN_0_HI	0x60
+#define LM3532_REG_ZN_0_LO	0x61
+#define LM3532_REG_ZN_1_HI	0x62
+#define LM3532_REG_ZN_1_LO	0x63
+#define LM3532_REG_ZN_2_HI	0x64
+#define LM3532_REG_ZN_2_LO	0x65
+#define LM3532_REG_ZN_3_HI	0x66
+#define LM3532_REG_ZN_3_LO	0x67
+#define LM3532_REG_MAX		0x7e
+
+/* Contorl Enable */
+#define LM3532_CTRL_A_ENABLE	BIT(0)
+#define LM3532_CTRL_B_ENABLE	BIT(1)
+#define LM3532_CTRL_C_ENABLE	BIT(2)
+
+/* PWM Zone Control */
+#define LM3532_PWM_ZONE_MASK	0x7c
+#define LM3532_PWM_ZONE_0_EN	BIT(2)
+#define LM3532_PWM_ZONE_1_EN	BIT(3)
+#define LM3532_PWM_ZONE_2_EN	BIT(4)
+#define LM3532_PWM_ZONE_3_EN	BIT(5)
+#define LM3532_PWM_ZONE_4_EN	BIT(6)
+
+/* Brightness Configuration */
+#define LM3532_I2C_CTRL		BIT(0)
+#define LM3532_ALS_CTRL		0
+#define LM3532_LINEAR_MAP	BIT(1)
+#define LM3532_ZONE_MASK	(BIT(2) | BIT(3) | BIT(4))
+#define LM3532_ZONE_0		0
+#define LM3532_ZONE_1		BIT(2)
+#define LM3532_ZONE_2		BIT(3)
+#define LM3532_ZONE_3		(BIT(2) | BIT(3))
+#define LM3532_ZONE_4		BIT(4)
+
+#define LM3532_ENABLE_ALS	BIT(3)
+#define LM3532_ALS_SEL_SHIFT	6
+
+/* Zone Boundary Register */
+#define LM3532_ALS_WINDOW_mV	2000
+#define LM3532_ALS_ZB_MAX	4
+#define LM3532_ALS_OFFSET_mV	2
+
+#define LM3532_CONTROL_A	0
+#define LM3532_CONTROL_B	1
+#define LM3532_CONTROL_C	2
+#define LM3532_MAX_CONTROL_BANKS 3
+#define LM3532_MAX_LED_STRINGS	3
+
+#define LM3532_OUTPUT_CFG_MASK	0x3
+#define LM3532_BRT_VAL_ADJUST	8
+#define LM3532_RAMP_DOWN_SHIFT	3
+
+#define LM3532_NUM_RAMP_VALS	8
+#define LM3532_NUM_AVG_VALS	8
+#define LM3532_NUM_IMP_VALS	32
+
+/*
+ * struct lm3532_als_data
+ * @config - value of ALS configuration register
+ * @als1_imp_sel - value of ALS1 resistor select register
+ * @als2_imp_sel - value of ALS2 resistor select register
+ * @als_avrg_time - ALS averaging time
+ * @als_input_mode - ALS input mode for brightness control
+ * @als_vmin - Minimum ALS voltage
+ * @als_vmax - Maximum ALS voltage
+ * @zone_lo - values of ALS lo ZB(Zone Boundary) registers
+ * @zone_hi - values of ALS hi ZB(Zone Boundary) registers
+ */
+struct lm3532_als_data {
+	u8 config;
+	u8 als1_imp_sel;
+	u8 als2_imp_sel;
+	u8 als_avrg_time;
+	u8 als_input_mode;
+	u32 als_vmin;
+	u32 als_vmax;
+	u8 zones_lo[LM3532_ALS_ZB_MAX];
+	u8 zones_hi[LM3532_ALS_ZB_MAX];
+};
+
+/**
+ * struct lm3532_led
+ * @led_dev: led class device
+ * @priv - Pointer the device data structure
+ * @control_bank - Control bank the LED is associated to
+ * @mode - Mode of the LED string
+ * @num_leds - Number of LED strings are supported in this array
+ * @led_strings - The LED strings supported in this array
+ * @label - LED label
+ */
+struct lm3532_led {
+	struct led_classdev led_dev;
+	struct lm3532_data *priv;
+
+	int control_bank;
+	int mode;
+	int num_leds;
+	u32 led_strings[LM3532_MAX_CONTROL_BANKS];
+	char label[LED_MAX_NAME_SIZE];
+};
+
+/**
+ * struct lm3532_data
+ * @enable_gpio - Hardware enable gpio
+ * @regulator: regulator
+ * @client: i2c client
+ * @regmap - Devices register map
+ * @dev - Pointer to the devices device struct
+ * @lock - Lock for reading/writing the device
+ * @als_data - Pointer to the als data struct
+ * @runtime_ramp_up - Runtime ramp up setting
+ * @runtime_ramp_down - Runtime ramp down setting
+ * @leds - Array of LED strings
+ */
+struct lm3532_data {
+	struct gpio_desc *enable_gpio;
+	struct regulator *regulator;
+	struct i2c_client *client;
+	struct regmap *regmap;
+	struct device *dev;
+	struct mutex lock;
+
+	struct lm3532_als_data *als_data;
+
+	u32 runtime_ramp_up;
+	u32 runtime_ramp_down;
+
+	struct lm3532_led leds[];
+};
+
+static const struct reg_default lm3532_reg_defs[] = {
+	{LM3532_REG_OUTPUT_CFG, 0xe4},
+	{LM3532_REG_STARTSHUT_RAMP, 0xc0},
+	{LM3532_REG_RT_RAMP, 0xc0},
+	{LM3532_REG_PWM_A_CFG, 0x82},
+	{LM3532_REG_PWM_B_CFG, 0x82},
+	{LM3532_REG_PWM_C_CFG, 0x82},
+	{LM3532_REG_ZONE_CFG_A, 0xf1},
+	{LM3532_REG_CTRL_A_BRT, 0xf3},
+	{LM3532_REG_ZONE_CFG_B, 0xf1},
+	{LM3532_REG_CTRL_B_BRT, 0xf3},
+	{LM3532_REG_ZONE_CFG_C, 0xf1},
+	{LM3532_REG_CTRL_C_BRT, 0xf3},
+	{LM3532_REG_ENABLE, 0xf8},
+	{LM3532_ALS_CONFIG, 0x44},
+	{LM3532_REG_ZN_0_HI, 0x35},
+	{LM3532_REG_ZN_0_LO, 0x33},
+	{LM3532_REG_ZN_1_HI, 0x6a},
+	{LM3532_REG_ZN_1_LO, 0x66},
+	{LM3532_REG_ZN_2_HI, 0xa1},
+	{LM3532_REG_ZN_2_LO, 0x99},
+	{LM3532_REG_ZN_3_HI, 0xdc},
+	{LM3532_REG_ZN_3_LO, 0xcc},
+};
+
+static const struct regmap_config lm3532_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+
+	.max_register = LM3532_REG_MAX,
+	.reg_defaults = lm3532_reg_defs,
+	.num_reg_defaults = ARRAY_SIZE(lm3532_reg_defs),
+	.cache_type = REGCACHE_FLAT,
+};
+
+const static int als_imp_table[LM3532_NUM_IMP_VALS] = {37000, 18500, 12330,
+						       92500, 7400, 6170, 5290,
+						       4630, 4110, 3700, 3360,
+						       3080, 2850, 2640, 2440,
+						       2310, 2180, 2060, 1950,
+						       1850, 1760, 1680, 1610,
+						       1540, 1480, 1420, 1370,
+						       1320, 1280, 1230, 1190};
+static int lm3532_get_als_imp_index(int als_imped)
+{
+	int i;
+
+	if (als_imped > als_imp_table[1])
+		return 0;
+
+	if (als_imped < als_imp_table[LM3532_NUM_IMP_VALS - 1])
+		return LM3532_NUM_IMP_VALS - 1;
+
+	for (i = 1; i < LM3532_NUM_IMP_VALS; i++) {
+		if (als_imped == als_imp_table[i])
+			return i;
+
+		/* Find an approximate index by looking up the table */
+		if (als_imped < als_imp_table[i - 1] &&
+		    als_imped > als_imp_table[i]) {
+			if (als_imped - als_imp_table[i - 1] <
+			    als_imp_table[i] - als_imped)
+				return i + 1;
+			else
+				return i;
+		}
+	}
+
+	return -EINVAL;
+}
+
+static int lm3532_get_index(const int table[], int size, int value)
+{
+	int i;
+
+	for (i = 1; i < size; i++) {
+		if (value == table[i])
+			return i;
+
+		/* Find an approximate index by looking up the table */
+		if (value > table[i - 1] &&
+		    value < table[i]) {
+			if (value - table[i - 1] < table[i] - value)
+				return i - 1;
+			else
+				return i;
+		}
+	}
+
+	return -EINVAL;
+}
+
+const static int als_avrg_table[LM3532_NUM_AVG_VALS] = {17920, 35840, 71680,
+							1433360, 286720, 573440,
+							1146880, 2293760};
+static int lm3532_get_als_avg_index(int avg_time)
+{
+	if (avg_time <= als_avrg_table[0])
+		return 0;
+
+	if (avg_time > als_avrg_table[LM3532_NUM_AVG_VALS - 1])
+		return LM3532_NUM_AVG_VALS - 1;
+
+	return lm3532_get_index(&als_avrg_table[0], LM3532_NUM_AVG_VALS,
+				avg_time);
+}
+
+const static int ramp_table[LM3532_NUM_RAMP_VALS] = { 8, 1024, 2048, 4096, 8192,
+						     16384, 32768, 65536};
+static int lm3532_get_ramp_index(int ramp_time)
+{
+	if (ramp_time <= ramp_table[0])
+		return 0;
+
+	if (ramp_time > ramp_table[LM3532_NUM_RAMP_VALS - 1])
+		return LM3532_NUM_RAMP_VALS - 1;
+
+	return lm3532_get_index(&ramp_table[0], LM3532_NUM_RAMP_VALS,
+				ramp_time);
+}
+
+static int lm3532_led_enable(struct lm3532_led *led_data)
+{
+	int ctrl_en_val = BIT(led_data->control_bank);
+	int ret;
+
+	ret = regmap_update_bits(led_data->priv->regmap, LM3532_REG_ENABLE,
+					 ctrl_en_val, ctrl_en_val);
+	if (ret) {
+		dev_err(led_data->priv->dev, "Failed to set ctrl:%d\n", ret);
+		return ret;
+	}
+
+	return regulator_enable(led_data->priv->regulator);
+}
+
+static int lm3532_led_disable(struct lm3532_led *led_data)
+{
+	int ctrl_en_val = BIT(led_data->control_bank);
+	int ret;
+
+	ret = regmap_update_bits(led_data->priv->regmap, LM3532_REG_ENABLE,
+					 ctrl_en_val, ~ctrl_en_val);
+	if (ret) {
+		dev_err(led_data->priv->dev, "Failed to set ctrl:%d\n", ret);
+		return ret;
+	}
+
+	return regulator_disable(led_data->priv->regulator);
+}
+
+static int lm3532_brightness_set(struct led_classdev *led_cdev,
+				 enum led_brightness brt_val)
+{
+	struct lm3532_led *led =
+			container_of(led_cdev, struct lm3532_led, led_dev);
+	u8 brightness_reg;
+	int ret;
+
+	mutex_lock(&led->priv->lock);
+
+	if (led->mode == LM3532_BL_MODE_ALS) {
+		if (brt_val > LED_OFF)
+			ret = lm3532_led_enable(led);
+		else
+			ret = lm3532_led_disable(led);
+
+		goto unlock;
+	}
+
+	if (brt_val == LED_OFF) {
+		ret = lm3532_led_disable(led);
+		goto unlock;
+	}
+
+	ret = lm3532_led_enable(led);
+	if (ret)
+		goto unlock;
+
+	brightness_reg = LM3532_REG_CTRL_A_BRT + led->control_bank * 2;
+	brt_val = brt_val / LM3532_BRT_VAL_ADJUST;
+
+	ret = regmap_write(led->priv->regmap, brightness_reg, brt_val);
+
+unlock:
+	mutex_unlock(&led->priv->lock);
+	return ret;
+}
+
+static int lm3532_init_registers(struct lm3532_led *led)
+{
+	struct lm3532_data *drvdata = led->priv;
+	unsigned int runtime_ramp_val;
+	unsigned int output_cfg_val = 0;
+	unsigned int output_cfg_shift = 0;
+	unsigned int output_cfg_mask = 0;
+	int ret, i;
+
+	for (i = 0; i < led->num_leds; i++) {
+		output_cfg_shift = led->led_strings[i] * 2;
+		output_cfg_val |= (led->control_bank << output_cfg_shift);
+		output_cfg_mask |= LM3532_OUTPUT_CFG_MASK << output_cfg_shift;
+	}
+
+	ret = regmap_update_bits(drvdata->regmap, LM3532_REG_OUTPUT_CFG,
+				 output_cfg_mask, output_cfg_val);
+	if (ret)
+		return ret;
+
+	runtime_ramp_val = drvdata->runtime_ramp_up |
+			 (drvdata->runtime_ramp_down << LM3532_RAMP_DOWN_SHIFT);
+
+	return regmap_write(drvdata->regmap, LM3532_REG_RT_RAMP,
+			    runtime_ramp_val);
+}
+
+static int lm3532_als_configure(struct lm3532_data *priv,
+				struct lm3532_led *led)
+{
+	struct lm3532_als_data *als = priv->als_data;
+	u32 als_vmin, als_vmax, als_vstep;
+	int zone_reg = LM3532_REG_ZN_0_HI;
+	int brightnes_config_reg;
+	int ret;
+	int i;
+
+	als_vmin = als->als_vmin;
+	als_vmax = als->als_vmax;
+
+	als_vstep = (als_vmax - als_vmin) / ((LM3532_ALS_ZB_MAX + 1) * 2);
+
+	for (i = 0; i < LM3532_ALS_ZB_MAX; i++) {
+		als->zones_lo[i] = ((als_vmin + als_vstep + (i * als_vstep)) *
+				LED_FULL) / 1000;
+		als->zones_hi[i] = ((als_vmin + LM3532_ALS_OFFSET_mV +
+				als_vstep + (i * als_vstep)) * LED_FULL) / 1000;
+
+		zone_reg = LM3532_REG_ZN_0_HI + i * 2;
+		ret = regmap_write(priv->regmap, zone_reg, als->zones_lo[i]);
+		if (ret)
+			return ret;
+
+		zone_reg += 1;
+		ret = regmap_write(priv->regmap, zone_reg, als->zones_hi[i]);
+		if (ret)
+			return ret;
+	}
+
+	als->config = (als->als_avrg_time | (LM3532_ENABLE_ALS) |
+		(als->als_input_mode << LM3532_ALS_SEL_SHIFT));
+
+	ret = regmap_write(priv->regmap, LM3532_ALS_CONFIG, als->config);
+	if (ret)
+		return ret;
+
+	brightnes_config_reg = LM3532_REG_ZONE_CFG_A + led->control_bank * 2;
+
+	return regmap_update_bits(priv->regmap, brightnes_config_reg,
+				  LM3532_I2C_CTRL, LM3532_ALS_CTRL);
+}
+
+static int lm3532_parse_als(struct lm3532_data *priv)
+{
+	struct lm3532_als_data *als;
+	int als_avg_time;
+	int als_impedance;
+	int ret;
+
+	als = devm_kzalloc(priv->dev, sizeof(*als), GFP_KERNEL);
+	if (als == NULL)
+		return -ENOMEM;
+
+	ret = device_property_read_u32(&priv->client->dev, "ti,als-vmin",
+				       &als->als_vmin);
+	if (ret)
+		als->als_vmin = 0;
+
+	ret = device_property_read_u32(&priv->client->dev, "ti,als-vmax",
+				       &als->als_vmax);
+	if (ret)
+		als->als_vmax = LM3532_ALS_WINDOW_mV;
+
+	if (als->als_vmax > LM3532_ALS_WINDOW_mV) {
+		ret = -EINVAL;
+		return ret;
+	}
+
+	ret = device_property_read_u32(&priv->client->dev, "ti,als1-imp-sel",
+				      &als_impedance);
+	if (ret)
+		als->als1_imp_sel = 0;
+	else
+		als->als1_imp_sel = lm3532_get_als_imp_index(als_impedance);
+
+	ret = device_property_read_u32(&priv->client->dev, "ti,als2-imp-sel",
+				      &als_impedance);
+	if (ret)
+		als->als2_imp_sel = 0;
+	else
+		als->als2_imp_sel = lm3532_get_als_imp_index(als_impedance);
+
+	ret = device_property_read_u32(&priv->client->dev, "ti,als-avrg-time-us",
+				      &als_avg_time);
+	if (ret)
+		als->als_avrg_time = 0;
+	else
+		als->als_avrg_time = lm3532_get_als_avg_index(als_avg_time);
+
+	ret = device_property_read_u8(&priv->client->dev, "ti,als-input-mode",
+				      &als->als_input_mode);
+	if (ret)
+		als->als_input_mode = 0;
+
+	if (als->als_input_mode > LM3532_BL_MODE_ALS) {
+		ret = -EINVAL;
+		return ret;
+	}
+
+	priv->als_data = als;
+
+	return ret;
+}
+
+static int lm3532_parse_node(struct lm3532_data *priv)
+{
+	struct fwnode_handle *child = NULL;
+	struct lm3532_led *led;
+	const char *name;
+	int control_bank;
+	u32 ramp_time;
+	size_t i = 0;
+	int ret;
+
+	priv->enable_gpio = devm_gpiod_get_optional(&priv->client->dev,
+						   "enable", GPIOD_OUT_LOW);
+	if (IS_ERR(priv->enable_gpio))
+		priv->enable_gpio = NULL;
+
+	priv->regulator = devm_regulator_get(&priv->client->dev, "vin");
+	if (IS_ERR(priv->regulator))
+		priv->regulator = NULL;
+
+	ret = device_property_read_u32(&priv->client->dev, "ramp-up-us",
+				       &ramp_time);
+	if (ret)
+		dev_info(&priv->client->dev, "ramp-up-ms property missing\n");
+	else
+		priv->runtime_ramp_up = lm3532_get_ramp_index(ramp_time);
+
+	ret = device_property_read_u32(&priv->client->dev, "ramp-down-us",
+				       &ramp_time);
+	if (ret)
+		dev_info(&priv->client->dev, "ramp-down-ms property missing\n");
+	else
+		priv->runtime_ramp_down = lm3532_get_ramp_index(ramp_time);
+
+	device_for_each_child_node(priv->dev, child) {
+		led = &priv->leds[i];
+
+		ret = fwnode_property_read_u32(child, "reg", &control_bank);
+		if (ret) {
+			dev_err(&priv->client->dev, "reg property missing\n");
+			fwnode_handle_put(child);
+			goto child_out;
+		}
+
+		if (control_bank > LM3532_CONTROL_C) {
+			dev_err(&priv->client->dev, "Control bank invalid\n");
+			continue;
+		}
+
+		led->control_bank = control_bank;
+
+		ret = fwnode_property_read_u32(child, "ti,led-mode",
+					       &led->mode);
+		if (ret) {
+			dev_err(&priv->client->dev, "ti,led-mode property missing\n");
+			fwnode_handle_put(child);
+			goto child_out;
+		}
+
+		if (led->mode == LM3532_BL_MODE_ALS) {
+			ret = lm3532_parse_als(priv);
+			if (ret)
+				dev_err(&priv->client->dev, "Failed to parse als\n");
+			else
+				lm3532_als_configure(priv, led);
+		}
+
+		led->num_leds = fwnode_property_read_u32_array(child,
+							       "led-sources",
+							       NULL, 0);
+
+		if (led->num_leds > LM3532_MAX_LED_STRINGS) {
+			dev_err(&priv->client->dev, "To many LED string defined\n");
+			continue;
+		}
+
+		ret = fwnode_property_read_u32_array(child, "led-sources",
+						    led->led_strings,
+						    led->num_leds);
+		if (ret) {
+			dev_err(&priv->client->dev, "led-sources property missing\n");
+			fwnode_handle_put(child);
+			goto child_out;
+		}
+
+		fwnode_property_read_string(child, "linux,default-trigger",
+					    &led->led_dev.default_trigger);
+
+		ret = fwnode_property_read_string(child, "label", &name);
+		if (ret)
+			snprintf(led->label, sizeof(led->label),
+				"%s::", priv->client->name);
+		else
+			snprintf(led->label, sizeof(led->label),
+				 "%s:%s", priv->client->name, name);
+
+		led->priv = priv;
+		led->led_dev.name = led->label;
+		led->led_dev.brightness_set_blocking = lm3532_brightness_set;
+
+		ret = devm_led_classdev_register(priv->dev, &led->led_dev);
+		if (ret) {
+			dev_err(&priv->client->dev, "led register err: %d\n",
+				ret);
+			fwnode_handle_put(child);
+			goto child_out;
+		}
+
+		lm3532_init_registers(led);
+
+		i++;
+	}
+
+child_out:
+	return ret;
+}
+
+static int lm3532_probe(struct i2c_client *client,
+			   const struct i2c_device_id *id)
+{
+	struct lm3532_data *drvdata;
+	int ret = 0;
+	int count;
+
+	count = device_get_child_node_count(&client->dev);
+	if (!count) {
+		dev_err(&client->dev, "LEDs are not defined in device tree!");
+		return -ENODEV;
+	}
+
+	drvdata = devm_kzalloc(&client->dev, struct_size(drvdata, leds, count),
+			   GFP_KERNEL);
+	if (drvdata == NULL)
+		return -ENOMEM;
+
+	drvdata->client = client;
+	drvdata->dev = &client->dev;
+
+	drvdata->regmap = devm_regmap_init_i2c(client, &lm3532_regmap_config);
+	if (IS_ERR(drvdata->regmap)) {
+		ret = PTR_ERR(drvdata->regmap);
+		dev_err(&client->dev, "Failed to allocate register map: %d\n",
+			ret);
+		return ret;
+	}
+
+	mutex_init(&drvdata->lock);
+	i2c_set_clientdata(client, drvdata);
+
+	ret = lm3532_parse_node(drvdata);
+	if (ret) {
+		dev_err(&client->dev, "Failed to parse node\n");
+		return ret;
+	}
+
+	if (drvdata->enable_gpio)
+		gpiod_direction_output(drvdata->enable_gpio, 1);
+
+	return ret;
+}
+
+static int lm3532_remove(struct i2c_client *client)
+{
+	struct lm3532_data *drvdata = i2c_get_clientdata(client);
+
+	mutex_destroy(&drvdata->lock);
+
+	if (drvdata->enable_gpio)
+		gpiod_direction_output(drvdata->enable_gpio, 0);
+
+	return 0;
+}
+
+static const struct of_device_id of_lm3532_leds_match[] = {
+	{ .compatible = "ti,lm3532", },
+	{},
+};
+MODULE_DEVICE_TABLE(of, of_lm3532_leds_match);
+
+static const struct i2c_device_id lm3532_id[] = {
+	{LM3532_NAME, 0},
+	{}
+};
+MODULE_DEVICE_TABLE(i2c, lm3532_id);
+
+static struct i2c_driver lm3532_i2c_driver = {
+	.probe = lm3532_probe,
+	.remove = lm3532_remove,
+	.id_table = lm3532_id,
+	.driver = {
+		.name = LM3532_NAME,
+		.of_match_table = of_lm3532_leds_match,
+	},
+};
+module_i2c_driver(lm3532_i2c_driver);
+
+MODULE_DESCRIPTION("Back Light driver for LM3532");
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Dan Murphy <dmurphy@ti.com>");

drivers/leds/leds-lt3593.c

@@ -60,67 +60,14 @@ static int lt3593_led_set(struct led_classdev *led_cdev,
 	return 0;
 }
 
-static struct lt3593_led_data *lt3593_led_probe_pdata(struct device *dev)
-{
-	struct gpio_led_platform_data *pdata = dev_get_platdata(dev);
-	const struct gpio_led *template = &pdata->leds[0];
-	struct lt3593_led_data *led_data;
-	int ret, state;
-
-	if (pdata->num_leds != 1)
-		return ERR_PTR(-EINVAL);
-
-	led_data = devm_kzalloc(dev, sizeof(*led_data), GFP_KERNEL);
-	if (!led_data)
-		return ERR_PTR(-ENOMEM);
-
-	led_data->cdev.name = template->name;
-	led_data->cdev.default_trigger = template->default_trigger;
-	led_data->cdev.brightness_set_blocking = lt3593_led_set;
-
-	state = (template->default_state == LEDS_GPIO_DEFSTATE_ON);
-	led_data->cdev.brightness = state ? LED_FULL : LED_OFF;
-
-	if (!template->retain_state_suspended)
-		led_data->cdev.flags |= LED_CORE_SUSPENDRESUME;
-
-	ret = devm_gpio_request_one(dev, template->gpio, state ?
-				    GPIOF_OUT_INIT_HIGH : GPIOF_OUT_INIT_LOW,
-				    template->name);
-	if (ret < 0)
-		return ERR_PTR(ret);
-
-	led_data->gpiod = gpio_to_desc(template->gpio);
-	if (!led_data->gpiod)
-		return ERR_PTR(-EPROBE_DEFER);
-
-	ret = devm_led_classdev_register(dev, &led_data->cdev);
-	if (ret < 0)
-		return ERR_PTR(ret);
-
-	dev_info(dev, "registered LT3593 LED '%s' at GPIO %d\n",
-		 template->name, template->gpio);
-
-	return led_data;
-}
-
 static int lt3593_led_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct lt3593_led_data *led_data;
 	struct fwnode_handle *child;
 	int ret, state = LEDS_GPIO_DEFSTATE_OFF;
-	enum gpiod_flags flags = GPIOD_OUT_LOW;
 	const char *tmp;
 
-	if (dev_get_platdata(dev)) {
-		led_data = lt3593_led_probe_pdata(dev);
-		if (IS_ERR(led_data))
-			return PTR_ERR(led_data);
-
-		goto out;
-	}
-
 	if (!dev->of_node)
 		return -ENODEV;
 
@@ -151,13 +98,8 @@ static int lt3593_led_probe(struct platform_device *pdev)
 				    &led_data->cdev.default_trigger);
 
 	if (!fwnode_property_read_string(child, "default-state", &tmp)) {
-		if (!strcmp(tmp, "keep")) {
-			state = LEDS_GPIO_DEFSTATE_KEEP;
-			flags = GPIOD_ASIS;
-		} else if (!strcmp(tmp, "on")) {
+		if (!strcmp(tmp, "on"))
 			state = LEDS_GPIO_DEFSTATE_ON;
-			flags = GPIOD_OUT_HIGH;
-		}
 	}
 
 	led_data->cdev.name = led_data->name;
@@ -171,20 +113,16 @@ static int lt3593_led_probe(struct platform_device *pdev)
 	}
 
 	led_data->cdev.dev->of_node = dev->of_node;
-
-out:
 	platform_set_drvdata(pdev, led_data);
 
 	return 0;
 }
 
-#ifdef CONFIG_OF
 static const struct of_device_id of_lt3593_leds_match[] = {
 	{ .compatible = "lltc,lt3593", },
 	{},
 };
 MODULE_DEVICE_TABLE(of, of_lt3593_leds_match);
-#endif
 
 static struct platform_driver lt3593_led_driver = {
 	.probe		= lt3593_led_probe,

drivers/leds/leds-pca955x.c

@@ -40,7 +40,6 @@
  *  bits the chip supports.
  */
 
-#include <linux/acpi.h>
 #include <linux/ctype.h>
 #include <linux/delay.h>
 #include <linux/err.h>
@@ -48,8 +47,8 @@
 #include <linux/i2c.h>
 #include <linux/leds.h>
 #include <linux/module.h>
-#include <linux/of_device.h>
 #include <linux/of.h>
+#include <linux/property.h>
 #include <linux/slab.h>
 #include <linux/string.h>
 
@@ -110,15 +109,6 @@ static const struct i2c_device_id pca955x_id[] = {
 };
 MODULE_DEVICE_TABLE(i2c, pca955x_id);
 
-static const struct acpi_device_id pca955x_acpi_ids[] = {
-	{ "PCA9550",  pca9550 },
-	{ "PCA9551",  pca9551 },
-	{ "PCA9552",  pca9552 },
-	{ "PCA9553",  pca9553 },
-	{ }
-};
-MODULE_DEVICE_TABLE(acpi, pca955x_acpi_ids);
-
 struct pca955x {
 	struct mutex lock;
 	struct pca955x_led *leds;
@@ -373,16 +363,14 @@ static int pca955x_gpio_direction_output(struct gpio_chip *gc,
 }
 #endif /* CONFIG_LEDS_PCA955X_GPIO */
 
-#if IS_ENABLED(CONFIG_OF)
 static struct pca955x_platform_data *
-pca955x_pdata_of_init(struct i2c_client *client, struct pca955x_chipdef *chip)
+pca955x_get_pdata(struct i2c_client *client, struct pca955x_chipdef *chip)
 {
-	struct device_node *np = client->dev.of_node;
-	struct device_node *child;
 	struct pca955x_platform_data *pdata;
+	struct fwnode_handle *child;
 	int count;
 
-	count = of_get_child_count(np);
+	count = device_get_child_node_count(&client->dev);
 	if (!count || count > chip->bits)
 		return ERR_PTR(-ENODEV);
 
@@ -396,24 +384,25 @@ pca955x_pdata_of_init(struct i2c_client *client, struct pca955x_chipdef *chip)
 	if (!pdata->leds)
 		return ERR_PTR(-ENOMEM);
 
-	for_each_child_of_node(np, child) {
+	device_for_each_child_node(&client->dev, child) {
 		const char *name;
 		u32 reg;
 		int res;
 
-		res = of_property_read_u32(child, "reg", &reg);
+		res = fwnode_property_read_u32(child, "reg", &reg);
 		if ((res != 0) || (reg >= chip->bits))
 			continue;
 
-		if (of_property_read_string(child, "label", &name))
-			name = child->name;
+		res = fwnode_property_read_string(child, "label", &name);
+		if ((res != 0) && is_of_node(child))
+			name = to_of_node(child)->name;
 
 		snprintf(pdata->leds[reg].name, sizeof(pdata->leds[reg].name),
 			 "%s", name);
 
 		pdata->leds[reg].type = PCA955X_TYPE_LED;
-		of_property_read_u32(child, "type", &pdata->leds[reg].type);
-		of_property_read_string(child, "linux,default-trigger",
+		fwnode_property_read_u32(child, "type", &pdata->leds[reg].type);
+		fwnode_property_read_string(child, "linux,default-trigger",
 					&pdata->leds[reg].default_trigger);
 	}
 
@@ -429,15 +418,7 @@ static const struct of_device_id of_pca955x_match[] = {
 	{ .compatible = "nxp,pca9553", .data = (void *)pca9553 },
 	{},
 };
-
 MODULE_DEVICE_TABLE(of, of_pca955x_match);
-#else
-static struct pca955x_platform_data *
-pca955x_pdata_of_init(struct i2c_client *client, struct pca955x_chipdef *chip)
-{
-	return ERR_PTR(-ENODEV);
-}
-#endif
 
 static int pca955x_probe(struct i2c_client *client,
 					const struct i2c_device_id *id)
@@ -450,20 +431,11 @@ static int pca955x_probe(struct i2c_client *client,
 	struct pca955x_platform_data *pdata;
 	int ngpios = 0;
 
-	if (id) {
 	chip = &pca955x_chipdefs[id->driver_data];
-	} else {
-		const struct acpi_device_id *acpi_id;
-
-		acpi_id = acpi_match_device(pca955x_acpi_ids, &client->dev);
-		if (!acpi_id)
-			return -ENODEV;
-		chip = &pca955x_chipdefs[acpi_id->driver_data];
-	}
 	adapter = to_i2c_adapter(client->dev.parent);
 	pdata = dev_get_platdata(&client->dev);
 	if (!pdata) {
-		pdata =	pca955x_pdata_of_init(client, chip);
+		pdata =	pca955x_get_pdata(client, chip);
 		if (IS_ERR(pdata))
 			return PTR_ERR(pdata);
 	}
@@ -602,8 +574,7 @@ static int pca955x_probe(struct i2c_client *client,
 static struct i2c_driver pca955x_driver = {
 	.driver = {
 		.name	= "leds-pca955x",
-		.acpi_match_table = ACPI_PTR(pca955x_acpi_ids),
-		.of_match_table = of_match_ptr(of_pca955x_match),
+		.of_match_table = of_pca955x_match,
 	},
 	.probe	= pca955x_probe,
 	.id_table = pca955x_id,

drivers/leds/leds-pca963x.c

@@ -25,7 +25,6 @@
  * or by adding the 'nxp,hw-blink' property to the DTS.
  */
 
-#include <linux/acpi.h>
 #include <linux/module.h>
 #include <linux/delay.h>
 #include <linux/string.h>
@@ -33,6 +32,7 @@
 #include <linux/leds.h>
 #include <linux/err.h>
 #include <linux/i2c.h>
+#include <linux/property.h>
 #include <linux/slab.h>
 #include <linux/of.h>
 #include <linux/platform_data/leds-pca963x.h>
@@ -97,15 +97,6 @@ static const struct i2c_device_id pca963x_id[] = {
 };
 MODULE_DEVICE_TABLE(i2c, pca963x_id);
 
-static const struct acpi_device_id pca963x_acpi_ids[] = {
-	{ "PCA9632", pca9633 },
-	{ "PCA9633", pca9633 },
-	{ "PCA9634", pca9634 },
-	{ "PCA9635", pca9635 },
-	{ }
-};
-MODULE_DEVICE_TABLE(acpi, pca963x_acpi_ids);
-
 struct pca963x_led;
 
 struct pca963x {
@@ -287,16 +278,15 @@ static int pca963x_blink_set(struct led_classdev *led_cdev,
 	return 0;
 }
 
-#if IS_ENABLED(CONFIG_OF)
 static struct pca963x_platform_data *
-pca963x_dt_init(struct i2c_client *client, struct pca963x_chipdef *chip)
+pca963x_get_pdata(struct i2c_client *client, struct pca963x_chipdef *chip)
 {
-	struct device_node *np = client->dev.of_node, *child;
 	struct pca963x_platform_data *pdata;
 	struct led_info *pca963x_leds;
+	struct fwnode_handle *child;
 	int count;
 
-	count = of_get_child_count(np);
+	count = device_get_child_node_count(&client->dev);
 	if (!count || count > chip->n_leds)
 		return ERR_PTR(-ENODEV);
 
@@ -305,18 +295,22 @@ pca963x_dt_init(struct i2c_client *client, struct pca963x_chipdef *chip)
 	if (!pca963x_leds)
 		return ERR_PTR(-ENOMEM);
 
-	for_each_child_of_node(np, child) {
+	device_for_each_child_node(&client->dev, child) {
 		struct led_info led = {};
 		u32 reg;
 		int res;
 
-		res = of_property_read_u32(child, "reg", &reg);
+		res = fwnode_property_read_u32(child, "reg", &reg);
 		if ((res != 0) || (reg >= chip->n_leds))
 			continue;
-		led.name =
-			of_get_property(child, "label", NULL) ? : child->name;
-		led.default_trigger =
-			of_get_property(child, "linux,default-trigger", NULL);
+
+		res = fwnode_property_read_string(child, "label", &led.name);
+		if ((res != 0) && is_of_node(child))
+			led.name = to_of_node(child)->name;
+
+		fwnode_property_read_string(child, "linux,default-trigger",
+					    &led.default_trigger);
+
 		pca963x_leds[reg] = led;
 	}
 	pdata = devm_kzalloc(&client->dev,
@@ -328,22 +322,23 @@ pca963x_dt_init(struct i2c_client *client, struct pca963x_chipdef *chip)
 	pdata->leds.num_leds = chip->n_leds;
 
 	/* default to open-drain unless totem pole (push-pull) is specified */
-	if (of_property_read_bool(np, "nxp,totem-pole"))
+	if (device_property_read_bool(&client->dev, "nxp,totem-pole"))
 		pdata->outdrv = PCA963X_TOTEM_POLE;
 	else
 		pdata->outdrv = PCA963X_OPEN_DRAIN;
 
 	/* default to software blinking unless hardware blinking is specified */
-	if (of_property_read_bool(np, "nxp,hw-blink"))
+	if (device_property_read_bool(&client->dev, "nxp,hw-blink"))
 		pdata->blink_type = PCA963X_HW_BLINK;
 	else
 		pdata->blink_type = PCA963X_SW_BLINK;
 
-	if (of_property_read_u32(np, "nxp,period-scale", &chip->scaling))
+	if (device_property_read_u32(&client->dev, "nxp,period-scale",
+				     &chip->scaling))
 		chip->scaling = 1000;
 
 	/* default to non-inverted output, unless inverted is specified */
-	if (of_property_read_bool(np, "nxp,inverted-out"))
+	if (device_property_read_bool(&client->dev, "nxp,inverted-out"))
 		pdata->dir = PCA963X_INVERTED;
 	else
 		pdata->dir = PCA963X_NORMAL;
@@ -359,13 +354,6 @@ static const struct of_device_id of_pca963x_match[] = {
 	{},
 };
 MODULE_DEVICE_TABLE(of, of_pca963x_match);
-#else
-static struct pca963x_platform_data *
-pca963x_dt_init(struct i2c_client *client, struct pca963x_chipdef *chip)
-{
-	return ERR_PTR(-ENODEV);
-}
-#endif
 
 static int pca963x_probe(struct i2c_client *client,
 					const struct i2c_device_id *id)
@@ -376,20 +364,11 @@ static int pca963x_probe(struct i2c_client *client,
 	struct pca963x_chipdef *chip;
 	int i, err;
 
-	if (id) {
 	chip = &pca963x_chipdefs[id->driver_data];
-	} else {
-		const struct acpi_device_id *acpi_id;
-
-		acpi_id = acpi_match_device(pca963x_acpi_ids, &client->dev);
-		if (!acpi_id)
-			return -ENODEV;
-		chip = &pca963x_chipdefs[acpi_id->driver_data];
-	}
 	pdata = dev_get_platdata(&client->dev);
 
 	if (!pdata) {
-		pdata = pca963x_dt_init(client, chip);
+		pdata = pca963x_get_pdata(client, chip);
 		if (IS_ERR(pdata)) {
 			dev_warn(&client->dev, "could not parse configuration\n");
 			pdata = NULL;
@@ -495,8 +474,7 @@ static int pca963x_remove(struct i2c_client *client)
 static struct i2c_driver pca963x_driver = {
 	.driver = {
 		.name	= "leds-pca963x",
-		.of_match_table = of_match_ptr(of_pca963x_match),
-		.acpi_match_table = ACPI_PTR(pca963x_acpi_ids),
+		.of_match_table = of_pca963x_match,
 	},
 	.probe	= pca963x_probe,
 	.remove	= pca963x_remove,

drivers/mfd/ti-lmu.c

@@ -54,14 +54,6 @@ static void ti_lmu_disable_hw(void *data)
 		gpiod_set_value(lmu->en_gpio, 0);
 }
 
-static const struct mfd_cell lm3532_devices[] = {
-	{
-		.name          = "ti-lmu-backlight",
-		.id            = LM3532,
-		.of_compatible = "ti,lm3532-backlight",
-	},
-};
-
 #define LM363X_REGULATOR(_id)			\
 {						\
 	.name          = "lm363x-regulator",	\
@@ -141,7 +133,6 @@ static const struct ti_lmu_data chip##_data =	\
 	.max_register = max_reg,		\
 }						\
 
-TI_LMU_DATA(lm3532, LM3532_MAX_REG);
 TI_LMU_DATA(lm3631, LM3631_MAX_REG);
 TI_LMU_DATA(lm3632, LM3632_MAX_REG);
 TI_LMU_DATA(lm3633, LM3633_MAX_REG);
@@ -211,7 +202,6 @@ static int ti_lmu_probe(struct i2c_client *cl, const struct i2c_device_id *id)
 }
 
 static const struct of_device_id ti_lmu_of_match[] = {
-	{ .compatible = "ti,lm3532", .data = &lm3532_data },
 	{ .compatible = "ti,lm3631", .data = &lm3631_data },
 	{ .compatible = "ti,lm3632", .data = &lm3632_data },
 	{ .compatible = "ti,lm3633", .data = &lm3633_data },
@@ -222,7 +212,6 @@ static const struct of_device_id ti_lmu_of_match[] = {
 MODULE_DEVICE_TABLE(of, ti_lmu_of_match);
 
 static const struct i2c_device_id ti_lmu_ids[] = {
-	{ "lm3532", LM3532 },
 	{ "lm3631", LM3631 },
 	{ "lm3632", LM3632 },
 	{ "lm3633", LM3633 },

include/linux/mfd/ti-lmu-register.h

@@ -15,50 +15,6 @@
 
 #include <linux/bitops.h>
 
-/* LM3532 */
-#define LM3532_REG_OUTPUT_CFG			0x10
-#define LM3532_ILED1_CFG_MASK			0x03
-#define LM3532_ILED2_CFG_MASK			0x0C
-#define LM3532_ILED3_CFG_MASK			0x30
-#define LM3532_ILED1_CFG_SHIFT			0
-#define LM3532_ILED2_CFG_SHIFT			2
-#define LM3532_ILED3_CFG_SHIFT			4
-
-#define LM3532_REG_RAMPUP			0x12
-#define LM3532_REG_RAMPDN			LM3532_REG_RAMPUP
-#define LM3532_RAMPUP_MASK			0x07
-#define LM3532_RAMPUP_SHIFT			0
-#define LM3532_RAMPDN_MASK			0x38
-#define LM3532_RAMPDN_SHIFT			3
-
-#define LM3532_REG_ENABLE			0x1D
-
-#define LM3532_REG_PWM_A_CFG			0x13
-#define LM3532_PWM_A_MASK			0x05	/* zone 0 */
-#define LM3532_PWM_ZONE_0			BIT(2)
-
-#define LM3532_REG_PWM_B_CFG			0x14
-#define LM3532_PWM_B_MASK			0x09	/* zone 1 */
-#define LM3532_PWM_ZONE_1			BIT(3)
-
-#define LM3532_REG_PWM_C_CFG			0x15
-#define LM3532_PWM_C_MASK			0x11	/* zone 2 */
-#define LM3532_PWM_ZONE_2			BIT(4)
-
-#define LM3532_REG_ZONE_CFG_A			0x16
-#define LM3532_REG_ZONE_CFG_B			0x18
-#define LM3532_REG_ZONE_CFG_C			0x1A
-#define LM3532_ZONE_MASK			(BIT(2) | BIT(3) | BIT(4))
-#define LM3532_ZONE_0				0
-#define LM3532_ZONE_1				BIT(2)
-#define LM3532_ZONE_2				BIT(3)
-
-#define LM3532_REG_BRT_A			0x70	/* zone 0 */
-#define LM3532_REG_BRT_B			0x76	/* zone 1 */
-#define LM3532_REG_BRT_C			0x7C	/* zone 2 */
-
-#define LM3532_MAX_REG				0x7E
-
 /* LM3631 */
 #define LM3631_REG_DEVCTRL			0x00
 #define LM3631_LCD_EN_MASK			BIT(1)

include/linux/mfd/ti-lmu.h

@@ -22,7 +22,6 @@
 #define LMU_EVENT_MONITOR_DONE		0x01
 
 enum ti_lmu_id {
-	LM3532,
 	LM3631,
 	LM3632,
 	LM3633,

sound/usb/line6/toneport.c

@@ -291,8 +291,8 @@ static bool toneport_has_led(struct usb_line6_toneport *toneport)
 	}
 }
 
-static const char * const led_colors[2] = { "red", "green" };
-static const int led_init_vals[2] = { 0x00, 0x26 };
+static const char * const toneport_led_colors[2] = { "red", "green" };
+static const int toneport_led_init_vals[2] = { 0x00, 0x26 };
 
 static void toneport_update_led(struct usb_line6_toneport *toneport)
 {
@@ -320,9 +320,9 @@ static int toneport_init_leds(struct usb_line6_toneport *toneport)
 
 		led->toneport = toneport;
 		snprintf(led->name, sizeof(led->name), "%s::%s",
-			 dev_name(dev), led_colors[i]);
+			 dev_name(dev), toneport_led_colors[i]);
 		leddev->name = led->name;
-		leddev->brightness = led_init_vals[i];
+		leddev->brightness = toneport_led_init_vals[i];
 		leddev->max_brightness = 0x26;
 		leddev->brightness_set = toneport_led_brightness_set;
 		err = led_classdev_register(dev, leddev);