leds: pca955x: Refactor with helper functions and renaming

Add helper functions to clean up the code, and rename a few
oddly named functions and variables.

Signed-off-by: Eddie James <eajames@linux.ibm.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20250212143038.1416501-2-eajames@linux.ibm.com
Signed-off-by: Lee Jones <lee@kernel.org>

Author: Eddie James

drivers/leds/leds-pca955x.c

@@ -124,13 +124,15 @@ struct pca955x_led {
 	struct fwnode_handle	*fwnode;
 };
 
+#define led_to_pca955x(l)	container_of(l, struct pca955x_led, led_cdev)
+
 struct pca955x_platform_data {
 	struct pca955x_led	*leds;
 	int			num_leds;
 };
 
 /* 8 bits per input register */
-static inline int pca95xx_num_input_regs(int bits)
+static inline int pca955x_num_input_regs(int bits)
 {
 	return (bits + 7) / 8;
 }
@@ -145,14 +147,19 @@ static inline u8 pca955x_ledsel(u8 oldval, int led_num, int state)
 		((state & 0x3) << (led_num << 1));
 }
 
+static inline int pca955x_ledstate(u8 ls, int led_num)
+{
+	return (ls >> (led_num << 1)) & 0x3;
+}
+
 /*
  * Write to frequency prescaler register, used to program the
  * period of the PWM output.  period = (PSCx + 1) / 38
  */
 static int pca955x_write_psc(struct i2c_client *client, int n, u8 val)
 {
 	struct pca955x *pca955x = i2c_get_clientdata(client);
-	u8 cmd = pca95xx_num_input_regs(pca955x->chipdef->bits) + (2 * n);
+	u8 cmd = pca955x_num_input_regs(pca955x->chipdef->bits) + (2 * n);
 	int ret;
 
 	ret = i2c_smbus_write_byte_data(client, cmd, val);
@@ -172,7 +179,7 @@ static int pca955x_write_psc(struct i2c_client *client, int n, u8 val)
 static int pca955x_write_pwm(struct i2c_client *client, int n, u8 val)
 {
 	struct pca955x *pca955x = i2c_get_clientdata(client);
-	u8 cmd = pca95xx_num_input_regs(pca955x->chipdef->bits) + 1 + (2 * n);
+	u8 cmd = pca955x_num_input_regs(pca955x->chipdef->bits) + 1 + (2 * n);
 	int ret;
 
 	ret = i2c_smbus_write_byte_data(client, cmd, val);
@@ -189,7 +196,7 @@ static int pca955x_write_pwm(struct i2c_client *client, int n, u8 val)
 static int pca955x_write_ls(struct i2c_client *client, int n, u8 val)
 {
 	struct pca955x *pca955x = i2c_get_clientdata(client);
-	u8 cmd = pca95xx_num_input_regs(pca955x->chipdef->bits) + 4 + n;
+	u8 cmd = pca955x_num_input_regs(pca955x->chipdef->bits) + 4 + n;
 	int ret;
 
 	ret = i2c_smbus_write_byte_data(client, cmd, val);
@@ -206,7 +213,7 @@ static int pca955x_write_ls(struct i2c_client *client, int n, u8 val)
 static int pca955x_read_ls(struct i2c_client *client, int n, u8 *val)
 {
 	struct pca955x *pca955x = i2c_get_clientdata(client);
-	u8 cmd = pca95xx_num_input_regs(pca955x->chipdef->bits) + 4 + n;
+	u8 cmd = pca955x_num_input_regs(pca955x->chipdef->bits) + 4 + n;
 	int ret;
 
 	ret = i2c_smbus_read_byte_data(client, cmd);
@@ -222,7 +229,7 @@ static int pca955x_read_ls(struct i2c_client *client, int n, u8 *val)
 static int pca955x_read_pwm(struct i2c_client *client, int n, u8 *val)
 {
 	struct pca955x *pca955x = i2c_get_clientdata(client);
-	u8 cmd = pca95xx_num_input_regs(pca955x->chipdef->bits) + 1 + (2 * n);
+	u8 cmd = pca955x_num_input_regs(pca955x->chipdef->bits) + 1 + (2 * n);
 	int ret;
 
 	ret = i2c_smbus_read_byte_data(client, cmd);
@@ -237,9 +244,7 @@ static int pca955x_read_pwm(struct i2c_client *client, int n, u8 *val)
 
 static enum led_brightness pca955x_led_get(struct led_classdev *led_cdev)
 {
-	struct pca955x_led *pca955x_led = container_of(led_cdev,
-						       struct pca955x_led,
-						       led_cdev);
+	struct pca955x_led *pca955x_led = led_to_pca955x(led_cdev);
 	struct pca955x *pca955x = pca955x_led->pca955x;
 	u8 ls, pwm;
 	int ret;
@@ -248,8 +253,7 @@ static enum led_brightness pca955x_led_get(struct led_classdev *led_cdev)
 	if (ret)
 		return ret;
 
-	ls = (ls >> ((pca955x_led->led_num % 4) << 1)) & 0x3;
-	switch (ls) {
+	switch (pca955x_ledstate(ls, pca955x_led->led_num % 4)) {
 	case PCA955X_LS_LED_ON:
 		ret = LED_FULL;
 		break;
@@ -273,34 +277,28 @@ static enum led_brightness pca955x_led_get(struct led_classdev *led_cdev)
 static int pca955x_led_set(struct led_classdev *led_cdev,
 			    enum led_brightness value)
 {
-	struct pca955x_led *pca955x_led;
-	struct pca955x *pca955x;
+	struct pca955x_led *pca955x_led = led_to_pca955x(led_cdev);
+	struct pca955x *pca955x = pca955x_led->pca955x;
+	int reg = pca955x_led->led_num / 4;
+	int bit = pca955x_led->led_num % 4;
 	u8 ls;
-	int chip_ls;	/* which LSx to use (0-3 potentially) */
-	int ls_led;	/* which set of bits within LSx to use (0-3) */
 	int ret;
 
-	pca955x_led = container_of(led_cdev, struct pca955x_led, led_cdev);
-	pca955x = pca955x_led->pca955x;
-
-	chip_ls = pca955x_led->led_num / 4;
-	ls_led = pca955x_led->led_num % 4;
-
 	mutex_lock(&pca955x->lock);
 
-	ret = pca955x_read_ls(pca955x->client, chip_ls, &ls);
+	ret = pca955x_read_ls(pca955x->client, reg, &ls);
 	if (ret)
 		goto out;
 
 	switch (value) {
 	case LED_FULL:
-		ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_LED_ON);
+		ls = pca955x_ledsel(ls, bit, PCA955X_LS_LED_ON);
 		break;
 	case LED_OFF:
-		ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_LED_OFF);
+		ls = pca955x_ledsel(ls, bit, PCA955X_LS_LED_OFF);
 		break;
 	case LED_HALF:
-		ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_BLINK0);
+		ls = pca955x_ledsel(ls, bit, PCA955X_LS_BLINK0);
 		break;
 	default:
 		/*
@@ -313,11 +311,11 @@ static int pca955x_led_set(struct led_classdev *led_cdev,
 		ret = pca955x_write_pwm(pca955x->client, 1, 255 - value);
 		if (ret)
 			goto out;
-		ls = pca955x_ledsel(ls, ls_led, PCA955X_LS_BLINK1);
+		ls = pca955x_ledsel(ls, bit, PCA955X_LS_BLINK1);
 		break;
 	}
 
-	ret = pca955x_write_ls(pca955x->client, chip_ls, ls);
+	ret = pca955x_write_ls(pca955x->client, reg, ls);
 
 out:
 	mutex_unlock(&pca955x->lock);