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/*
* Copyright (C) ST-Ericsson SA 2010
*
* Author: Sesahgiri.Holi <seshagiri.holi@stericsson.com> for ST-Ericsson
* License terms: GNU General Public License (GPL), version 2.
*/
#include <common.h>
#include <i2c.h>
#include <asm/arch/prcmu-db5500.h>
#include "u5500_backlight.h"
#define BACKLIGHT_SLAVE_ADDR 0x36
#define LM3530_GEN_CONFIG 0x10
#define LM3530_ALS_CONFIG 0x20
#define LM3530_BRT_RAMP_RATE 0x30
#define LM3530_ALS_ZONE_REG 0x40
#define LM3530_ALS_IMP_SELECT 0x41
#define LM3530_BRT_CTRL_REG 0xA0
#define LM3530_ALS_ZB0_REG 0x60
#define LM3530_ALS_ZB1_REG 0x61
#define LM3530_ALS_ZB2_REG 0x62
#define LM3530_ALS_ZB3_REG 0x63
#define LM3530_ALS_Z0T_REG 0x70
#define LM3530_ALS_Z1T_REG 0x71
#define LM3530_ALS_Z2T_REG 0x72
#define LM3530_ALS_Z3T_REG 0x73
#define LM3530_ALS_Z4T_REG 0x74
#define LM3530_REG_MAX 15
#define ADDR_LEN 0x01
#define DATA_LEN 0x01
/* General Control Register */
#define LM3530_EN_I2C_SHIFT (0)
#define LM3530_RAMP_LAW_SHIFT (1)
#define LM3530_MAX_CURR_SHIFT (2)
#define LM3530_EN_PWM_SHIFT (5)
#define LM3530_PWM_POL_SHIFT (6)
#define LM3530_EN_PWM_SIMPLE_SHIFT (7)
#define LM3530_ENABLE_I2C (1 << LM3530_EN_I2C_SHIFT)
#define LM3530_ENABLE_PWM (1 << LM3530_EN_PWM_SHIFT)
#define LM3530_POL_LOW (1 << LM3530_PWM_POL_SHIFT)
#define LM3530_ENABLE_PWM_SIMPLE (1 << LM3530_EN_PWM_SIMPLE_SHIFT)
/* ALS Config Register Options */
#define LM3530_ALS_AVG_TIME_SHIFT (0)
#define LM3530_EN_ALS_SHIFT (3)
#define LM3530_ALS_SEL_SHIFT (5)
#define LM3530_ENABLE_ALS (3 << LM3530_EN_ALS_SHIFT)
/* Brightness Ramp Rate Register */
#define LM3530_BRT_RAMP_FALL_SHIFT (0)
#define LM3530_BRT_RAMP_RISE_SHIFT (3)
/* ALS Resistor Select */
#define LM3530_ALS1_IMP_SHIFT (0)
#define LM3530_ALS2_IMP_SHIFT (4)
/* Zone Boundary Register defaults */
#define LM3530_ALS_ZB_MAX (4)
#define LM3530_ALS_WINDOW_mV (1000)
#define LM3530_ALS_OFFSET_mV (4)
/* Zone Target Register defaults */
#define LM3530_DEF_ZT_0 (0x7F)
#define LM3530_DEF_ZT_1 (0x66)
#define LM3530_DEF_ZT_2 (0x4C)
#define LM3530_DEF_ZT_3 (0x33)
#define LM3530_DEF_ZT_4 (0x19)
#define LM3530_MAX_BRIGHTNESS (0x7F)
static const u8 lm3530_reg[LM3530_REG_MAX] = {
LM3530_GEN_CONFIG,
LM3530_ALS_CONFIG,
LM3530_BRT_RAMP_RATE,
LM3530_ALS_ZONE_REG,
LM3530_ALS_IMP_SELECT,
LM3530_BRT_CTRL_REG,
LM3530_ALS_ZB0_REG,
LM3530_ALS_ZB1_REG,
LM3530_ALS_ZB2_REG,
LM3530_ALS_ZB3_REG,
LM3530_ALS_Z0T_REG,
LM3530_ALS_Z1T_REG,
LM3530_ALS_Z2T_REG,
LM3530_ALS_Z3T_REG,
LM3530_ALS_Z4T_REG,
};
void backlight_init(void)
{
u8 gen_config;
u8 brt_ramp;
u8 byte;
u8 i;
int ret = 0;
u8 reg_val[LM3530_REG_MAX];
/* Enable regulator for back light*/
byte = 0x36;
(void) prcmu_abb_write(0x3, 0x7B, &byte, (u8)sizeof(byte));
i2c_set_bus_num(2);
i2c_set_bus_speed(CONFIG_SYS_I2C_SPEED);
gen_config = 0x1 << LM3530_RAMP_LAW_SHIFT |
LM3530_FS_CURR_26mA << LM3530_MAX_CURR_SHIFT |
LM3530_ENABLE_I2C;
brt_ramp = (LM3530_RAMP_TIME_260ms << LM3530_BRT_RAMP_FALL_SHIFT) |
(LM3530_RAMP_TIME_260ms << LM3530_BRT_RAMP_RISE_SHIFT);
reg_val[0] = gen_config; /* LM3530_GEN_CONFIG */
reg_val[1] = 0x00; /* LM3530_ALS_CONFIG */
reg_val[2] = brt_ramp; /* LM3530_BRT_RAMP_RATE */
reg_val[3] = 0x00; /* LM3530_ALS_ZONE_REG */
reg_val[4] = 0x00; /* LM3530_ALS_IMP_SELECT */
reg_val[5] = LM3530_MAX_BRIGHTNESS; /* LM3530_BRT_CTRL_REG */
reg_val[6] = 0x00; /* LM3530_ALS_ZB0_REG */
reg_val[7] = 0x00; /* LM3530_ALS_ZB1_REG */
reg_val[8] = 0x00; /* LM3530_ALS_ZB2_REG */
reg_val[9] = 0x00; /* LM3530_ALS_ZB3_REG */
reg_val[10] = LM3530_DEF_ZT_0; /* LM3530_ALS_Z0T_REG */
reg_val[11] = LM3530_DEF_ZT_1; /* LM3530_ALS_Z1T_REG */
reg_val[12] = LM3530_DEF_ZT_2; /* LM3530_ALS_Z2T_REG */
reg_val[13] = LM3530_DEF_ZT_3; /* LM3530_ALS_Z3T_REG */
reg_val[14] = LM3530_DEF_ZT_4; /* LM3530_ALS_Z4T_REG */
for (i = 0; i < LM3530_REG_MAX; i++) {
ret = i2c_write(BACKLIGHT_SLAVE_ADDR,
lm3530_reg[i], ADDR_LEN, ®_val[i],
DATA_LEN);
if (ret)
break;
}
return;
}
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