berlin_tools/bootloader/common/drivers/i2c_led/rgb_led_lp5018.c

#include "util.h"
#include "i2c_driver.h"

#define LP5018_DEVICE_CONFIG0		0x00
#define LP5018_DEVICE_CONFIG1		0x01
#define LP5018_GLOBAL_DIMMING		0x03
#define LP5018_BRIGHTNESS_BASE		0x07
#define LP5018_COLOR_BASE		0x0F
#define LP5018_MAX_LED_CHANNELS		24
#define LP5018_MAX_BANKS		3
#define LP5018_MAX_LEDS	          	8

extern int lgpl_printf(const char *format, ...);
extern int i2c_master_write_and_read(int id, int target_addr, unsigned char* send_buff, int send_len, unsigned char* recv_buff, int recv_len);

int diag_i2c_led_lp5018_detect_driver(int master_id, unsigned char slave_addr) {
	unsigned char tx_buf = LP5018_DEVICE_CONFIG1;
	unsigned char rx_buf = 0xFF;
	int ret;

	lgpl_printf("%s: master_id: %d slave_addr: 0x%x\n", __func__, master_id, slave_addr);

	ret = i2c_master_write_and_read(master_id, slave_addr, &tx_buf, 1, &rx_buf, 1);
	if (ret != 0) {
		lgpl_printf("%s: failed to set Config1 register.\n", __func__);
		return ret;
	}

	if (rx_buf != 0x3C) {
		lgpl_printf("%s: Config1 register value is incorrect: 0x%x\n", __func__, rx_buf);
		return -1;
	}

	return 0;
}

// Initializes the LP5018 LED driver at I2C address |slave_addr|.
int diag_i2c_led_lp5018_init(int master_id, unsigned char slave_addr) {
	unsigned char buff[2];
	unsigned char rx_buf = 0xFF;
	int ret;

	lgpl_printf("%s: master_id: %d slave_addr: 0x%x\n", __func__, master_id, slave_addr);

	/* Initialize LED driver */
	/* Set Chip_EN */
	buff[0] = LP5018_DEVICE_CONFIG0;
	buff[1] = 0x40;
	ret = i2c_master_write_and_read(master_id, slave_addr, buff, 2, 0, 0);
	if (ret != 0) {
		lgpl_printf("%s: failed to set Config0 register.\n", __func__);
		return ret;
	}

	/* Set Log_Scale_EN, Power_save_EN, Auto_incr_EN and PWm_Dithering_EN */
	buff[0] = LP5018_DEVICE_CONFIG1;
	buff[1] = 0x3C;
	ret = i2c_master_write_and_read(master_id, slave_addr, buff, 2, &rx_buf, 1);
	if (ret != 0) {
		lgpl_printf("%s: failed to set Config1 register.\n", __func__);
		return ret;
	}

        /* Now set all the leds to their first value */
	unsigned char val[LP5018_MAX_LED_CHANNELS + 1];
	size_t i;

	val[0] = LP5018_COLOR_BASE; // Register address
	for (i = 1; i < LP5018_MAX_LED_CHANNELS + 1; ++i) {
		val[i] = 0x00;
	}
	ret = i2c_master_write_and_read(master_id, slave_addr, val, sizeof(val),
	                                0, 0);
	if (ret < 0) {
		lgpl_printf("%s: failed on initialization LED.\n", __func__);
		return ret;
	}

	return 0;
}

// Sets the first |size|/3 LEDs of LP5018 with address |slave_addr| to |frame|.
int diag_i2c_led_lp5018_set_frame(int master_id, unsigned char slave_addr,
                           unsigned char *frame, size_t size) {
	int ret;
	unsigned char val[LP5018_MAX_LED_CHANNELS + LP5018_MAX_LEDS + 1];
	size_t i;

	if (size < LP5018_MAX_LED_CHANNELS + LP5018_MAX_LEDS){
		lgpl_printf("%s: LED frame is too small!.\n", __func__);
		return 0;
	}

	val[0] = LP5018_BRIGHTNESS_BASE; // Register address
	for (i = 1; i < LP5018_MAX_LED_CHANNELS + LP5018_MAX_LEDS + 1; ++i) {
		val[i] = frame[i-1];
	}
	ret = i2c_master_write_and_read(master_id, slave_addr, val, sizeof(val),
                                        0, 0);
	if (ret < 0) {
		lgpl_printf("%s: failed on initialization LED.\n", __func__);
		return ret;
	}

	return 0;
}