Add seesaw neopixel

Signed-off-by: Titouan Christophe <[email protected]>

Author: titouanc

drivers/led/CMakeLists.txt

@@ -20,6 +20,7 @@ zephyr_library_sources_ifdef(CONFIG_LP5562 lp5562.c)
 zephyr_library_sources_ifdef(CONFIG_LP5569 lp5569.c)
 zephyr_library_sources_ifdef(CONFIG_NCP5623 ncp5623.c)
 zephyr_library_sources_ifdef(CONFIG_PCA9633 pca9633.c)
+zephyr_library_sources_ifdef(CONFIG_SEESAW_NEOPIXEL seesaw_neopixel.c)
 zephyr_library_sources_ifdef(CONFIG_TLC59108 tlc59108.c)
 # zephyr-keep-sorted-stop
 

drivers/led/Kconfig

@@ -41,6 +41,7 @@ source "drivers/led/Kconfig.ncp5623"
 source "drivers/led/Kconfig.npm1300"
 source "drivers/led/Kconfig.pca9633"
 source "drivers/led/Kconfig.pwm"
+source "drivers/led/Kconfig.seesaw_neopixel"
 source "drivers/led/Kconfig.tlc59108"
 source "drivers/led/Kconfig.xec"
 # zephyr-keep-sorted-stop

drivers/led/Kconfig.seesaw_neopixel

@@ -0,0 +1,10 @@
+# Copyright 2025 Titouan Chrisotphe
+# SPDX-License-Identifier: Apache-2.0
+
+config SEESAW_NEOPIXEL
+	bool "Adafruit Seesaw neopixel leds over I2C"
+	default y
+	depends on MFD_SEESAW
+	depends on DT_HAS_ADAFRUIT_SEESAW_NEOPIXEL_ENABLED
+	help
+	  Enable support for Adafruit Seesaw neopixel leds

drivers/led/seesaw_neopixel.c

@@ -0,0 +1,108 @@
+/*
+ * Copyright (c) 2025 Titouan Christophe
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+#define DT_DRV_COMPAT adafruit_seesaw_neopixel
+
+#include <zephyr/drivers/led.h>
+#include <zephyr/drivers/mfd/mfd_seesaw.h>
+#include <zephyr/dt-bindings/led/led.h>
+
+enum seesaw_mod_neopixel {
+	NEOPIXEL_PIN = 0x01,
+	NEOPIXEL_SPEED = 0x02,
+	NEOPIXEL_BUF_LENGTH = 0x03,
+	NEOPIXEL_BUF = 0x04,
+	NEOPIXEL_SHOW = 0x05,
+};
+
+struct seesaw_neopixel_config {
+	const struct device *seesaw;
+	size_t length;
+	const uint8_t *color_mapping;
+	uint8_t num_colors;
+	uint8_t output_pin;
+};
+
+static int seesaw_neopixel_set_color(const struct device *dev, uint32_t led, uint8_t num_colors,
+					 const uint8_t *color)
+{
+	int ret;
+	const struct seesaw_neopixel_config *config = dev->config;
+	uint16_t offset = config->num_colors * led;
+	uint8_t buf[6] = {offset >> 8, offset & 0xff};
+
+	if (led >= config->length || num_colors != config->num_colors) {
+		return -EINVAL;
+	}
+
+	memcpy(buf + 2, color, num_colors);
+
+	ret = seesaw_write(config->seesaw, SEESAW_MOD_NEOPIXEL, NEOPIXEL_BUF, buf, 2 + num_colors);
+	if (ret) {
+		return ret;
+	}
+
+	return seesaw_cmd(config->seesaw, SEESAW_MOD_NEOPIXEL, NEOPIXEL_SHOW);
+}
+
+static int seesaw_neopixel_set_brightness(const struct device *dev, uint32_t led, uint8_t value)
+{
+	const struct seesaw_neopixel_config *config = dev->config;
+	uint8_t b = 255 * value / 100;
+	uint8_t color[] = {b, b, b, b};
+
+	if (value > 100) {
+		return -EINVAL;
+	}
+
+	return seesaw_neopixel_set_color(dev, led, config->num_colors, color);
+}
+
+static int seesaw_neopixel_on(const struct device *dev, uint32_t led)
+{
+	return seesaw_neopixel_set_brightness(dev, led, 100);
+}
+
+static int seesaw_neopixel_off(const struct device *dev, uint32_t led)
+{
+	return seesaw_neopixel_set_brightness(dev, led, 0);
+}
+
+static int seesaw_neopixel_init(const struct device *dev)
+{
+	const struct seesaw_neopixel_config *config = dev->config;
+	int ret = seesaw_claim_module(config->seesaw, SEESAW_MOD_NEOPIXEL, dev);
+
+	if (ret) {
+		return ret;
+	}
+
+	seesaw_write(config->seesaw, SEESAW_MOD_NEOPIXEL, NEOPIXEL_PIN, &config->output_pin, 1);
+	seesaw_write_uint16(config->seesaw, SEESAW_MOD_NEOPIXEL, NEOPIXEL_BUF_LENGTH, 3 * config->length);
+
+	return 0;
+}
+
+static DEVICE_API(led, seesaw_neopixel_api) = {
+	.on = seesaw_neopixel_on,
+	.off = seesaw_neopixel_off,
+	.set_brightness = seesaw_neopixel_set_brightness,
+	.set_color = seesaw_neopixel_set_color,
+};
+
+#define SEESAW_NEOPIXEL_INIT(inst)                                                                 \
+	static const uint8_t cmap_##idx[] = DT_INST_PROP(inst, color_mapping);                     \
+	static const struct seesaw_neopixel_config config_##inst = {                               \
+		.seesaw = DEVICE_DT_GET(DT_INST_PARENT(inst)),                                     \
+		.length = DT_INST_PROP(inst, chain_length),                                        \
+		.color_mapping = cmap_##idx,                                                       \
+		.num_colors = sizeof(cmap_##idx),                                                  \
+		.output_pin = DT_INST_PROP(inst, output_pin),                                      \
+	};                                                                                         \
+	DEVICE_DT_INST_DEFINE(inst, seesaw_neopixel_init, NULL, NULL, &config_##inst, POST_KERNEL, \
+				  CONFIG_LED_INIT_PRIORITY, &seesaw_neopixel_api);
+
+DT_INST_FOREACH_STATUS_OKAY(SEESAW_NEOPIXEL_INIT)

dts/bindings/led/adafruit,seesaw-neopixel.yaml

@@ -0,0 +1,15 @@
+# Copyright (c) 2025 Titouan Christophe
+# SPDX-License-Identifier: Apache-2.0
+
+description: Adafruit Seesaw neopixel output
+
+compatible: "adafruit,seesaw-neopixel"
+
+include: [led-strip.yaml]
+
+properties:
+  output-pin:
+    required: true
+    type: int
+    description: |
+      Neopixel output pin number