202 lines
8.2 KiB
C
202 lines
8.2 KiB
C
/*
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* Copyright (c) 2020 Cameron Banna.
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*/
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#define DT_DRV_COMPAT issi_is31fl3733
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/*
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* LED driver for the issi is31fl3733 IC
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* led_on sets the leds state to on
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* led_off sets the leds state to off
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* set_brightness sets thepwm value for the specific led
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* set_color will set leds based upon a led number and 3
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* values representing RGB this is applicable for uses
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* where the leds are wired as shown in the datasheet
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* in "Figure 2 Typical Application Circuit (RGB)".
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*
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* struct device *dev = device_get_binding("IS31FL3733");
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* #define red 255
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* #define green 255
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* #define blue 255
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* #define led 1
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* uint8_t RGB[3] = (red, green, blue);
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* set_color(dev, led, 3, RGB);
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*
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* This would set the led in position (SW1,CS1) to the value
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* of red, the led in position (SW2,CS1) to the value of
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* green, and the led in position (SW3,CS1) to the value of
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* blue. Before this is ran the 3 corresponding leds need
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* to be turned on first with the led_on call.
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*/
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#include <drivers/i2c.h>
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#include <drivers/led.h>
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#include <sys/util.h>
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#include <zephyr.h>
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#define LOG_LEVEL CONFIG_LED_LOG_LEVEL
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#include <logging/log.h>
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LOG_MODULE_REGISTER(is31fl3733);
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/** Number of CS lines. */
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#define IS31FL3733_CS (16)
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/** Number of SW lines. */
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#define IS31FL3733_SW (12)
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/** IS31FL3733 common registers. */
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#define IS31FL3733_PSR (0xFD) ///< Page select register. Write only.
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#define IS31FL3733_PSWL (0xFE) ///< Page select register write lock. Read/Write.
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/** Registers in Page 0. */
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#define IS31FL3733_LEDONOFF (0x0000) /// ON or OFF state control for each LED. Write only.
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#define IS31FL3733_LEDOPEN (0x0018) /// Open state for each LED. Read only.
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#define IS31FL3733_LEDSHORT (0x0030) /// Short state for each LED. Read only.
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/** Registers in Page 1. */
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#define IS31FL3733_LEDPWM (0x0100) /// PWM duty for each LED. Write only.
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/** Registers in Page 3. */
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#define IS31FL3733_CR (0x0300) /// Configuration Register. Write only.
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#define IS31FL3733_RESET (0x0311) /// Reset register. Read only.
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/** PSWL register bits. */
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#define IS31FL3733_PSWL_DISABLE (0x00) /// Disable write to Page Select register.
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#define IS31FL3733_PSWL_ENABLE (0xC5) /// Enable write to Page select register.
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struct is31fl3733_config {
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int reg;
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int inst;
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char *bus_name;
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};
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struct is31fl3733_data {
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const struct device *i2c;
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};
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uint8_t leds[IS31FL3733_SW * IS31FL3733_CS / 8];
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static int is31fl3733_set_page(const struct device *dev, uint16_t addr) {
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const struct is31fl3733_data *dev_data = dev->data;
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const struct is31fl3733_config *dev_cfg = dev->config;
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if (i2c_reg_write_byte(dev_data->i2c, dev_cfg->reg, IS31FL3733_PSWL, IS31FL3733_PSWL_ENABLE)) {
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LOG_ERR("Enable write to Page select register failed");
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return -EIO;
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}
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if (i2c_reg_write_byte(dev_data->i2c, dev_cfg->reg, IS31FL3733_PSR, addr)) {
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LOG_ERR("Writing to Page select register failed");
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return -EIO;
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}
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return 0;
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}
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static int is31fl3733_write_page_reg(const struct device *dev, uint8_t reg, uint8_t buffer) {
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const struct is31fl3733_data *dev_data = dev->data;
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const struct is31fl3733_config *dev_cfg = dev->config;
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if (i2c_reg_write_byte(dev_data->i2c, dev_cfg->reg, reg, buffer)) {
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LOG_ERR("Writing Page Failed");
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return -EIO;
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}
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return 0;
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}
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static int is31fl3733_led_set_brightness(const struct device *dev, uint32_t led, uint8_t value) {
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uint8_t cs = led - ((led / 16) * 16);
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uint8_t sw = led / 16;
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uint8_t offset = sw * IS31FL3733_CS + cs;
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// Set page to 0x01 PWM Page
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is31fl3733_set_page(dev, 0x01);
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is31fl3733_write_page_reg(dev, offset, value);
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return 0;
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}
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static inline int is31fl3733_led_on(const struct device *dev, uint32_t led) {
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uint8_t cs = led - ((led / 16) * 16);
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uint8_t sw = led / 16;
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uint8_t offset = (sw << 1) + (cs / 8);
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leds[offset] |= 0x01 << (cs % 8);
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// Set page to 0x01 Led Control Page
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is31fl3733_set_page(dev, 0x00);
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is31fl3733_write_page_reg(dev, offset, leds[offset]);
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return 0;
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}
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static inline int is31fl3733_led_off(const struct device *dev, uint32_t led) {
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uint8_t cs = led - ((led / 16) * 16);
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uint8_t sw = led / 16;
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uint8_t offset = (sw << 1) + (cs / 8);
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leds[offset] &= ~(0x01 << (cs % 8));
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// Set page to 0x01 Led Control Page
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is31fl3733_set_page(dev, 0x00);
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is31fl3733_write_page_reg(dev, offset, leds[offset]);
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return 0;
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}
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static int is31fl3733_led_set_color(const struct device *dev, uint32_t led, uint8_t num_of_colors,
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const uint8_t *colors) {
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uint8_t cs = led - ((led / 16) * 16);
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uint8_t sw = (led / 16) * 3;
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uint8_t offset_red = sw * IS31FL3733_CS + cs;
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uint8_t offset_green = (sw + 1) * IS31FL3733_CS + cs;
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uint8_t offset_blue = (sw + 2) * IS31FL3733_CS + cs;
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// Set page to 0x01 PWM Page
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is31fl3733_set_page(dev, 0x01);
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is31fl3733_write_page_reg(dev, offset_red, colors[0]);
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is31fl3733_write_page_reg(dev, offset_green, colors[1]);
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is31fl3733_write_page_reg(dev, offset_blue, colors[2]);
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return 0;
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}
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static int is31fl3733_led_reset(const struct device *dev) {
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const struct is31fl3733_data *data = dev->data;
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const struct is31fl3733_config *dev_cfg = dev->config;
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if (i2c_reg_write_byte(data->i2c, dev_cfg->reg, IS31FL3733_PSWL, IS31FL3733_PSWL_ENABLE)) {
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LOG_ERR("Enable write to Page select register failed");
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return -EIO;
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}
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uint8_t partA = (uint8_t)((IS31FL3733_RESET & 0xFF00) >> 8);
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uint8_t partB = (uint8_t)(IS31FL3733_RESET & 0x00FF);
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uint8_t tx_buf[2] = {IS31FL3733_PSR, partA};
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// Sequence to reset the IC
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if (i2c_write(data->i2c, tx_buf, 2, dev_cfg->reg)) {
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LOG_ERR("Reseting Device Failed");
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return -EIO;
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}
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uint8_t tx_buf2[1] = {partB};
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if (i2c_write(data->i2c, tx_buf2, 1, dev_cfg->reg)) {
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LOG_ERR("Reseting Device Failed");
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return -EIO;
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}
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if (i2c_read(data->i2c, NULL, 1, dev_cfg->reg)) {
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LOG_ERR("Reseting Device Failed");
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return -EIO;
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}
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// Set Page to 0x03 Function page
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is31fl3733_set_page(dev, 0x03);
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// use the write page reg function to set the config
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// register to 0x00 and set the value to 0x01 for normal
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// operation, this can also be set to 0x01 for software
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// shutdown mode. see page 17 & 18 of datasheet
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is31fl3733_write_page_reg(dev, 0x00, 0x01);
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return 0;
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}
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static int is31fl3733_led_init(const struct device *dev) {
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const struct is31fl3733_config *dev_cfg = dev->config;
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struct is31fl3733_data *dev_data = dev->data;
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dev_data->i2c = device_get_binding(dev_cfg->bus_name);
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if (dev_data->i2c == NULL) {
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LOG_DBG("Failed to get I2C device");
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return -EINVAL;
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}
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is31fl3733_led_reset(dev);
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// Set the Global Current Control, would like to pull this
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// value from the device tree eventually
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is31fl3733_write_page_reg(dev, 0x03, 0x01);
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uint8_t GCC = 255;
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is31fl3733_write_page_reg(dev, 0x01, GCC);
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return 0;
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}
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static const struct led_driver_api is31fl3733_led_api = {
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.on = is31fl3733_led_on,
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.off = is31fl3733_led_off,
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.set_brightness = is31fl3733_led_set_brightness,
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.set_color = is31fl3733_led_set_color,
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};
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#define IS31FL3733_INIT(inst) \
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static struct is31fl3733_data is31fl3733_led_data_##inst; \
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static const struct is31fl3733_config is31fl3733_config_##inst = { \
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.bus_name = DT_INST_BUS_LABEL(inst), \
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.reg = DT_INST_REG_ADDR(inst), \
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}; \
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DEVICE_AND_API_INIT(is31fl3733_led##inst, DT_INST_LABEL(inst), &is31fl3733_led_init, \
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&is31fl3733_led_data_##inst, &is31fl3733_config_##inst, POST_KERNEL, \
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CONFIG_LED_INIT_PRIORITY, &is31fl3733_led_api);
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DT_INST_FOREACH_STATUS_OKAY(IS31FL3733_INIT)
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