leds: leds-pca995x: Add support for NXP PCA9956B

Add support for PCA9956B chip, which belongs to the same family.

This chip features 24 instead of 16 outputs, so add a chipdef struct to
deal with the different register layouts.

Reviewed-by: Marek Vasut <[email protected]>
Signed-off-by: Pieterjan Camerlynck <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Lee Jones <[email protected]>

Author: Pieterjan Camerlynck

drivers/leds/leds-pca995x.c

@@ -19,10 +19,6 @@
 #define PCA995X_MODE1			0x00
 #define PCA995X_MODE2			0x01
 #define PCA995X_LEDOUT0			0x02
-#define PCA9955B_PWM0			0x08
-#define PCA9952_PWM0			0x0A
-#define PCA9952_IREFALL			0x43
-#define PCA9955B_IREFALL		0x45
 
 /* Auto-increment disabled. Normal mode */
 #define PCA995X_MODE1_CFG		0x00
@@ -34,17 +30,38 @@
 #define PCA995X_LDRX_MASK		0x3
 #define PCA995X_LDRX_BITS		2
 
-#define PCA995X_MAX_OUTPUTS		16
+#define PCA995X_MAX_OUTPUTS		24
 #define PCA995X_OUTPUTS_PER_REG		4
 
 #define PCA995X_IREFALL_FULL_CFG	0xFF
 #define PCA995X_IREFALL_HALF_CFG	(PCA995X_IREFALL_FULL_CFG / 2)
 
-#define PCA995X_TYPE_NON_B		0
-#define PCA995X_TYPE_B			1
-
 #define ldev_to_led(c)	container_of(c, struct pca995x_led, ldev)
 
+struct pca995x_chipdef {
+	unsigned int num_leds;
+	u8 pwm_base;
+	u8 irefall;
+};
+
+static const struct pca995x_chipdef pca9952_chipdef = {
+	.num_leds	= 16,
+	.pwm_base	= 0x0a,
+	.irefall	= 0x43,
+};
+
+static const struct pca995x_chipdef pca9955b_chipdef = {
+	.num_leds	= 16,
+	.pwm_base	= 0x08,
+	.irefall	= 0x45,
+};
+
+static const struct pca995x_chipdef pca9956b_chipdef = {
+	.num_leds	= 24,
+	.pwm_base	= 0x0a,
+	.irefall	= 0x40,
+};
+
 struct pca995x_led {
 	unsigned int led_no;
 	struct led_classdev ldev;
@@ -54,18 +71,19 @@ struct pca995x_led {
 struct pca995x_chip {
 	struct regmap *regmap;
 	struct pca995x_led leds[PCA995X_MAX_OUTPUTS];
-	int btype;
+	const struct pca995x_chipdef *chipdef;
 };
 
 static int pca995x_brightness_set(struct led_classdev *led_cdev,
 				  enum led_brightness brightness)
 {
 	struct pca995x_led *led = ldev_to_led(led_cdev);
 	struct pca995x_chip *chip = led->chip;
+	const struct pca995x_chipdef *chipdef = chip->chipdef;
 	u8 ledout_addr, pwmout_addr;
 	int shift, ret;
 
-	pwmout_addr = (chip->btype ? PCA9955B_PWM0 : PCA9952_PWM0) + led->led_no;
+	pwmout_addr = chipdef->pwm_base + led->led_no;
 	ledout_addr = PCA995X_LEDOUT0 + (led->led_no / PCA995X_OUTPUTS_PER_REG);
 	shift = PCA995X_LDRX_BITS * (led->led_no % PCA995X_OUTPUTS_PER_REG);
 
@@ -104,11 +122,12 @@ static int pca995x_probe(struct i2c_client *client)
 	struct fwnode_handle *led_fwnodes[PCA995X_MAX_OUTPUTS] = { 0 };
 	struct fwnode_handle *np, *child;
 	struct device *dev = &client->dev;
+	const struct pca995x_chipdef *chipdef;
 	struct pca995x_chip *chip;
 	struct pca995x_led *led;
-	int i, btype, reg, ret;
+	int i, reg, ret;
 
-	btype = (unsigned long)device_get_match_data(&client->dev);
+	chipdef = device_get_match_data(&client->dev);
 
 	np = dev_fwnode(dev);
 	if (!np)
@@ -118,7 +137,7 @@ static int pca995x_probe(struct i2c_client *client)
 	if (!chip)
 		return -ENOMEM;
 
-	chip->btype = btype;
+	chip->chipdef = chipdef;
 	chip->regmap = devm_regmap_init_i2c(client, &pca995x_regmap);
 	if (IS_ERR(chip->regmap))
 		return PTR_ERR(chip->regmap);
@@ -170,21 +189,21 @@ static int pca995x_probe(struct i2c_client *client)
 		return ret;
 
 	/* IREF Output current value for all LEDn outputs */
-	return regmap_write(chip->regmap,
-			    btype ? PCA9955B_IREFALL : PCA9952_IREFALL,
-			    PCA995X_IREFALL_HALF_CFG);
+	return regmap_write(chip->regmap, chipdef->irefall, PCA995X_IREFALL_HALF_CFG);
 }
 
 static const struct i2c_device_id pca995x_id[] = {
-	{ "pca9952", .driver_data = (kernel_ulong_t)PCA995X_TYPE_NON_B },
-	{ "pca9955b", .driver_data = (kernel_ulong_t)PCA995X_TYPE_B },
+	{ "pca9952", .driver_data = (kernel_ulong_t)&pca9952_chipdef },
+	{ "pca9955b", .driver_data = (kernel_ulong_t)&pca9955b_chipdef },
+	{ "pca9956b", .driver_data = (kernel_ulong_t)&pca9956b_chipdef },
 	{}
 };
 MODULE_DEVICE_TABLE(i2c, pca995x_id);
 
 static const struct of_device_id pca995x_of_match[] = {
-	{ .compatible = "nxp,pca9952",  .data = (void *)PCA995X_TYPE_NON_B },
-	{ .compatible = "nxp,pca9955b", .data = (void *)PCA995X_TYPE_B },
+	{ .compatible = "nxp,pca9952", .data = &pca9952_chipdef },
+	{ .compatible = "nxp,pca9955b", . data = &pca9955b_chipdef },
+	{ .compatible = "nxp,pca9956b", .data = &pca9956b_chipdef },
 	{},
 };
 MODULE_DEVICE_TABLE(of, pca995x_of_match);