leds: rgb: leds-ktd202x: Get device properties through fwnode to support ACPI

This LED controller is installed on a Xiaomi pad2 and it is an x86
platform. The original driver is based on the device tree and can't be
used for this ACPI based system. This patch migrated the driver to use
fwnode to access the properties. Moreover, the fwnode API supports the
device tree so this work won't affect the original implementations.

Signed-off-by: Kate Hsuan <[email protected]>
Tested-by: André Apitzsch <[email protected]> # on BQ Aquaris M5
Reviewed-by: Hans de Goede <[email protected]>
Reviewed-by: Andy Shevchenko <[email protected]>
Signed-off-by: Hans de Goede <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Lee Jones <[email protected]>

Author: Kate Hsuan

drivers/leds/rgb/Kconfig

@@ -17,7 +17,6 @@ config LEDS_GROUP_MULTICOLOR
 config LEDS_KTD202X
 	tristate "LED support for KTD202x Chips"
 	depends on I2C
-	depends on OF
 	select REGMAP_I2C
 	help
 	  This option enables support for the Kinetic KTD2026/KTD2027

drivers/leds/rgb/leds-ktd202x.c

@@ -99,7 +99,7 @@ struct ktd202x {
 	struct device *dev;
 	struct regmap *regmap;
 	bool enabled;
-	int num_leds;
+	unsigned long num_leds;
 	struct ktd202x_led leds[] __counted_by(num_leds);
 };
 
@@ -381,39 +381,42 @@ static int ktd202x_blink_mc_set(struct led_classdev *cdev,
 				 mc->num_colors);
 }
 
-static int ktd202x_setup_led_rgb(struct ktd202x *chip, struct device_node *np,
+static int ktd202x_setup_led_rgb(struct ktd202x *chip, struct fwnode_handle *fwnode,
 				 struct ktd202x_led *led, struct led_init_data *init_data)
 {
+	struct fwnode_handle *child;
 	struct led_classdev *cdev;
-	struct device_node *child;
 	struct mc_subled *info;
 	int num_channels;
 	int i = 0;
 
-	num_channels = of_get_available_child_count(np);
+	num_channels = 0;
+	fwnode_for_each_available_child_node(fwnode, child)
+		num_channels++;
+
 	if (!num_channels || num_channels > chip->num_leds)
 		return -EINVAL;
 
 	info = devm_kcalloc(chip->dev, num_channels, sizeof(*info), GFP_KERNEL);
 	if (!info)
 		return -ENOMEM;
 
-	for_each_available_child_of_node(np, child) {
+	fwnode_for_each_available_child_node(fwnode, child) {
 		u32 mono_color;
 		u32 reg;
 		int ret;
 
-		ret = of_property_read_u32(child, "reg", &reg);
+		ret = fwnode_property_read_u32(child, "reg", &reg);
 		if (ret != 0 || reg >= chip->num_leds) {
-			dev_err(chip->dev, "invalid 'reg' of %pOFn\n", child);
-			of_node_put(child);
-			return -EINVAL;
+			dev_err(chip->dev, "invalid 'reg' of %pfw\n", child);
+			fwnode_handle_put(child);
+			return ret;
 		}
 
-		ret = of_property_read_u32(child, "color", &mono_color);
+		ret = fwnode_property_read_u32(child, "color", &mono_color);
 		if (ret < 0 && ret != -EINVAL) {
-			dev_err(chip->dev, "failed to parse 'color' of %pOF\n", child);
-			of_node_put(child);
+			dev_err(chip->dev, "failed to parse 'color' of %pfw\n", child);
+			fwnode_handle_put(child);
 			return ret;
 		}
 
@@ -433,16 +436,16 @@ static int ktd202x_setup_led_rgb(struct ktd202x *chip, struct device_node *np,
 	return devm_led_classdev_multicolor_register_ext(chip->dev, &led->mcdev, init_data);
 }
 
-static int ktd202x_setup_led_single(struct ktd202x *chip, struct device_node *np,
+static int ktd202x_setup_led_single(struct ktd202x *chip, struct fwnode_handle *fwnode,
 				    struct ktd202x_led *led, struct led_init_data *init_data)
 {
 	struct led_classdev *cdev;
 	u32 reg;
 	int ret;
 
-	ret = of_property_read_u32(np, "reg", &reg);
+	ret = fwnode_property_read_u32(fwnode, "reg", &reg);
 	if (ret != 0 || reg >= chip->num_leds) {
-		dev_err(chip->dev, "invalid 'reg' of %pOFn\n", np);
+		dev_err(chip->dev, "invalid 'reg' of %pfw\n", fwnode);
 		return -EINVAL;
 	}
 	led->index = reg;
@@ -454,7 +457,7 @@ static int ktd202x_setup_led_single(struct ktd202x *chip, struct device_node *np
 	return devm_led_classdev_register_ext(chip->dev, &led->cdev, init_data);
 }
 
-static int ktd202x_add_led(struct ktd202x *chip, struct device_node *np, unsigned int index)
+static int ktd202x_add_led(struct ktd202x *chip, struct fwnode_handle *fwnode, unsigned int index)
 {
 	struct ktd202x_led *led = &chip->leds[index];
 	struct led_init_data init_data = {};
@@ -463,21 +466,21 @@ static int ktd202x_add_led(struct ktd202x *chip, struct device_node *np, unsigne
 	int ret;
 
 	/* Color property is optional in single color case */
-	ret = of_property_read_u32(np, "color", &color);
+	ret = fwnode_property_read_u32(fwnode, "color", &color);
 	if (ret < 0 && ret != -EINVAL) {
-		dev_err(chip->dev, "failed to parse 'color' of %pOF\n", np);
+		dev_err(chip->dev, "failed to parse 'color' of %pfw\n", fwnode);
 		return ret;
 	}
 
 	led->chip = chip;
-	init_data.fwnode = of_fwnode_handle(np);
+	init_data.fwnode = fwnode;
 
 	if (color == LED_COLOR_ID_RGB) {
 		cdev = &led->mcdev.led_cdev;
-		ret = ktd202x_setup_led_rgb(chip, np, led, &init_data);
+		ret = ktd202x_setup_led_rgb(chip, fwnode, led, &init_data);
 	} else {
 		cdev = &led->cdev;
-		ret = ktd202x_setup_led_single(chip, np, led, &init_data);
+		ret = ktd202x_setup_led_single(chip, fwnode, led, &init_data);
 	}
 
 	if (ret) {
@@ -490,15 +493,14 @@ static int ktd202x_add_led(struct ktd202x *chip, struct device_node *np, unsigne
 	return 0;
 }
 
-static int ktd202x_probe_dt(struct ktd202x *chip)
+static int ktd202x_probe_fw(struct ktd202x *chip)
 {
-	struct device_node *np = dev_of_node(chip->dev), *child;
+	struct fwnode_handle *child;
+	struct device *dev = chip->dev;
 	int count;
 	int i = 0;
 
-	chip->num_leds = (int)(unsigned long)of_device_get_match_data(chip->dev);
-
-	count = of_get_available_child_count(np);
+	count = device_get_child_node_count(dev);
 	if (!count || count > chip->num_leds)
 		return -EINVAL;
 
@@ -507,11 +509,11 @@ static int ktd202x_probe_dt(struct ktd202x *chip)
 	/* Allow the device to execute the complete reset */
 	usleep_range(200, 300);
 
-	for_each_available_child_of_node(np, child) {
+	device_for_each_child_node(dev, child) {
 		int ret = ktd202x_add_led(chip, child, i);
 
 		if (ret) {
-			of_node_put(child);
+			fwnode_handle_put(child);
 			return ret;
 		}
 		i++;
@@ -554,6 +556,8 @@ static int ktd202x_probe(struct i2c_client *client)
 		return ret;
 	}
 
+	chip->num_leds = (unsigned long)i2c_get_match_data(client);
+
 	chip->regulators[0].supply = "vin";
 	chip->regulators[1].supply = "vio";
 	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(chip->regulators), chip->regulators);
@@ -568,7 +572,7 @@ static int ktd202x_probe(struct i2c_client *client)
 		return ret;
 	}
 
-	ret = ktd202x_probe_dt(chip);
+	ret = ktd202x_probe_fw(chip);
 	if (ret < 0) {
 		regulator_bulk_disable(ARRAY_SIZE(chip->regulators), chip->regulators);
 		return ret;
@@ -605,7 +609,7 @@ static void ktd202x_shutdown(struct i2c_client *client)
 static const struct of_device_id ktd202x_match_table[] = {
 	{ .compatible = "kinetic,ktd2026", .data = (void *)KTD2026_NUM_LEDS },
 	{ .compatible = "kinetic,ktd2027", .data = (void *)KTD2027_NUM_LEDS },
-	{},
+	{}
 };
 MODULE_DEVICE_TABLE(of, ktd202x_match_table);