[PATCH 2/2] leds: leds-pca995x: Add support for NXP PCA9956B

[Pieterjan Camerlynck via B4 Relay <devnull+pieterjanca.gmail.com@kernel.org>]

From: Pieterjan Camerlynck <pieterjanca@gmail.com>

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.

Signed-off-by: Pieterjan Camerlynck <pieterjanca@gmail.com>
---
 drivers/leds/leds-pca995x.c | 88 ++++++++++++++++++++++++++-------------------
 1 file changed, 52 insertions(+), 36 deletions(-)

diff --git a/drivers/leds/leds-pca995x.c b/drivers/leds/leds-pca995x.c
index 78215dff1499..4cd2828a3f2d 100644
--- a/drivers/leds/leds-pca995x.c
+++ b/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 +30,43 @@
 #define PCA995X_LDRX_MASK		0x3
 #define PCA995X_LDRX_BITS		2
 
-#define PCA995X_MAX_OUTPUTS		16
 #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)
 
+enum pca995x_type {
+	pca9952,
+	pca9955b,
+	pca9956b,
+};
+
+struct pca995x_chipdef {
+	unsigned int num_leds;
+	u8 pwm_base;
+	u8 irefall;
+};
+
+static const struct pca995x_chipdef pca995x_chipdefs[] = {
+	[pca9952] = {
+		.num_leds	= 16,
+		.pwm_base	= 0x0a,
+		.irefall	= 0x43,
+	},
+	[pca9955b] = {
+		.num_leds	= 16,
+		.pwm_base	= 0x08,
+		.irefall	= 0x45,
+	},
+	[pca9956b] = {
+		.num_leds	= 24,
+		.pwm_base	= 0x0a,
+		.irefall	= 0x40,
+	},
+};
+
 struct pca995x_led {
 	unsigned int led_no;
 	struct led_classdev ldev;
@@ -52,9 +74,9 @@ struct pca995x_led {
 };
 
 struct pca995x_chip {
+	const struct pca995x_chipdef *chipdef;
 	struct regmap *regmap;
-	struct pca995x_led leds[PCA995X_MAX_OUTPUTS];
-	int btype;
+	struct pca995x_led leds[];
 };
 
 static int pca995x_brightness_set(struct led_classdev *led_cdev,
@@ -62,10 +84,11 @@ static int pca995x_brightness_set(struct led_classdev *led_cdev,
 {
 	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);
 
@@ -101,24 +124,24 @@ static const struct regmap_config pca995x_regmap = {
 
 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 reg, ret;
 
-	btype = (unsigned long)device_get_match_data(&client->dev);
+	chipdef = device_get_match_data(&client->dev);
 
 	np = dev_fwnode(dev);
 	if (!np)
 		return -ENODEV;
 
-	chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
+	chip = devm_kzalloc(dev, struct_size(chip, leds, chipdef->num_leds), GFP_KERNEL);
 	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);
@@ -126,41 +149,34 @@ static int pca995x_probe(struct i2c_client *client)
 	i2c_set_clientdata(client, chip);
 
 	fwnode_for_each_available_child_node(np, child) {
+		struct led_init_data init_data = {};
+
 		ret = fwnode_property_read_u32(child, "reg", &reg);
 		if (ret) {
 			fwnode_handle_put(child);
 			return ret;
 		}
 
-		if (reg < 0 || reg >= PCA995X_MAX_OUTPUTS || led_fwnodes[reg]) {
+		if (reg < 0 || reg >= chipdef->num_leds) {
 			fwnode_handle_put(child);
 			return -EINVAL;
 		}
 
 		led = &chip->leds[reg];
-		led_fwnodes[reg] = child;
 		led->chip = chip;
 		led->led_no = reg;
 		led->ldev.brightness_set_blocking = pca995x_brightness_set;
 		led->ldev.max_brightness = 255;
-	}
-
-	for (i = 0; i < PCA995X_MAX_OUTPUTS; i++) {
-		struct led_init_data init_data = {};
-
-		if (!led_fwnodes[i])
-			continue;
-
-		init_data.fwnode = led_fwnodes[i];
+		init_data.fwnode = child;
 
 		ret = devm_led_classdev_register_ext(dev,
-						     &chip->leds[i].ldev,
+						     &led->ldev,
 						     &init_data);
 		if (ret < 0) {
 			fwnode_handle_put(child);
 			return dev_err_probe(dev, ret,
 					     "Could not register LED %s\n",
-					     chip->leds[i].ldev.name);
+					     led->ldev.name);
 		}
 	}
 
@@ -170,21 +186,21 @@ 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)&pca995x_chipdefs[pca9952] },
+	{ "pca9955b", .driver_data = (kernel_ulong_t)&pca995x_chipdefs[pca9955b] },
+	{ "pca9956b", .driver_data = (kernel_ulong_t)&pca995x_chipdefs[pca9956b] },
 	{}
 };
 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 = &pca995x_chipdefs[pca9952] },
+	{ .compatible = "nxp,pca9955b", . data = &pca995x_chipdefs[pca9955b] },
+	{ .compatible = "nxp,pca9956b", .data = &pca995x_chipdefs[pca9956b] },
 	{},
 };
 MODULE_DEVICE_TABLE(of, pca995x_of_match);

-- 
2.45.2