diff options
Diffstat (limited to 'board/st-ericsson/u5500/u5500_backlight.c')
| -rw-r--r-- | board/st-ericsson/u5500/u5500_backlight.c | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/board/st-ericsson/u5500/u5500_backlight.c b/board/st-ericsson/u5500/u5500_backlight.c new file mode 100644 index 000000000..0b5eda665 --- /dev/null +++ b/board/st-ericsson/u5500/u5500_backlight.c @@ -0,0 +1,141 @@ +/* + * 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; +} |