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/*
* Copyright (C) 2011 ST-Ericsson SA.
* Copyright (C) 2009 Motorola, Inc.
*
* License Terms: GNU General Public License v2
*
* Simple driver for National Semiconductor LM3530 Backlight driver chip
*
* Author: Shreshtha Kumar SAHU <shreshthakumar.sahu@stericsson.com>
* based on leds-lm3530.c by Dan Murphy <D.Murphy@motorola.com>
*/
#include <linux/i2c.h>
#include <linux/leds.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/input.h>
#include <linux/led-lm3530.h>
#include <linux/types.h>
#include <linux/regulator/consumer.h>
#include <linux/module.h>
#define LM3530_LED_DEV "lcd-backlight"
#define LM3530_NAME "lm3530-led"
#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
/* 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)
struct lm3530_mode_map {
const char *mode;
enum lm3530_mode mode_val;
};
static struct lm3530_mode_map mode_map[] = {
{ "man", LM3530_BL_MODE_MANUAL },
{ "als", LM3530_BL_MODE_ALS },
{ "pwm", LM3530_BL_MODE_PWM },
};
/**
* struct lm3530_data
* @led_dev: led class device
* @client: i2c client
* @pdata: LM3530 platform data
* @mode: mode of operation - manual, ALS, PWM
* @regulator: regulator
* @brighness: previous brightness value
* @enable: regulator is enabled
*/
struct lm3530_data {
struct led_classdev led_dev;
struct i2c_client *client;
struct lm3530_platform_data *pdata;
enum lm3530_mode mode;
struct regulator *regulator;
enum led_brightness brightness;
bool enable;
};
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,
};
static int lm3530_get_mode_from_str(const char *str)
{
int i;
for (i = 0; i < ARRAY_SIZE(mode_map); i++)
if (sysfs_streq(str, mode_map[i].mode))
return mode_map[i].mode_val;
return -1;
}
static int lm3530_init_registers(struct lm3530_data *drvdata)
{
int ret = 0;
int i;
u8 gen_config;
u8 als_config = 0;
u8 brt_ramp;
u8 als_imp_sel = 0;
u8 brightness;
u8 reg_val[LM3530_REG_MAX];
u8 zones[LM3530_ALS_ZB_MAX];
u32 als_vmin, als_vmax, als_vstep;
struct lm3530_platform_data *pltfm = drvdata->pdata;
struct i2c_client *client = drvdata->client;
gen_config = (pltfm->brt_ramp_law << LM3530_RAMP_LAW_SHIFT) |
((pltfm->max_current & 7) << LM3530_MAX_CURR_SHIFT);
if (drvdata->mode == LM3530_BL_MODE_MANUAL ||
drvdata->mode == LM3530_BL_MODE_ALS)
gen_config |= (LM3530_ENABLE_I2C);
if (drvdata->mode == LM3530_BL_MODE_ALS) {
if (pltfm->als_vmax == 0) {
pltfm->als_vmin = als_vmin = 0;
pltfm->als_vmin = als_vmax = LM3530_ALS_WINDOW_mV;
}
als_vmin = pltfm->als_vmin;
als_vmax = pltfm->als_vmax;
if ((als_vmax - als_vmin) > LM3530_ALS_WINDOW_mV)
pltfm->als_vmax = als_vmax =
als_vmin + LM3530_ALS_WINDOW_mV;
/* n zone boundary makes n+1 zones */
als_vstep = (als_vmax - als_vmin) / (LM3530_ALS_ZB_MAX + 1);
for (i = 0; i < LM3530_ALS_ZB_MAX; i++)
zones[i] = (((als_vmin + LM3530_ALS_OFFSET_mV) +
als_vstep + (i * als_vstep)) * LED_FULL)
/ 1000;
als_config =
(pltfm->als_avrg_time << LM3530_ALS_AVG_TIME_SHIFT) |
(LM3530_ENABLE_ALS) |
(pltfm->als_input_mode << LM3530_ALS_SEL_SHIFT);
als_imp_sel =
(pltfm->als1_resistor_sel << LM3530_ALS1_IMP_SHIFT) |
(pltfm->als2_resistor_sel << LM3530_ALS2_IMP_SHIFT);
}
if (drvdata->mode == LM3530_BL_MODE_PWM)
gen_config |= (LM3530_ENABLE_PWM) |
(pltfm->pwm_pol_hi << LM3530_PWM_POL_SHIFT) |
(LM3530_ENABLE_PWM_SIMPLE);
brt_ramp = (pltfm->brt_ramp_fall << LM3530_BRT_RAMP_FALL_SHIFT) |
(pltfm->brt_ramp_rise << LM3530_BRT_RAMP_RISE_SHIFT);
if (drvdata->brightness)
brightness = drvdata->brightness;
else
brightness = drvdata->brightness = pltfm->brt_val;
reg_val[0] = gen_config; /* LM3530_GEN_CONFIG */
reg_val[1] = als_config; /* LM3530_ALS_CONFIG */
reg_val[2] = brt_ramp; /* LM3530_BRT_RAMP_RATE */
reg_val[3] = 0x00; /* LM3530_ALS_ZONE_REG */
reg_val[4] = als_imp_sel; /* LM3530_ALS_IMP_SELECT */
reg_val[5] = brightness; /* LM3530_BRT_CTRL_REG */
reg_val[6] = zones[0]; /* LM3530_ALS_ZB0_REG */
reg_val[7] = zones[1]; /* LM3530_ALS_ZB1_REG */
reg_val[8] = zones[2]; /* LM3530_ALS_ZB2_REG */
reg_val[9] = zones[3]; /* 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 */
if (!drvdata->enable) {
ret = regulator_enable(drvdata->regulator);
if (ret) {
dev_err(&drvdata->client->dev,
"Enable regulator failed\n");
return ret;
}
drvdata->enable = true;
}
for (i = 0; i < LM3530_REG_MAX; i++) {
ret = i2c_smbus_write_byte_data(client,
lm3530_reg[i], reg_val[i]);
if (ret)
break;
}
return ret;
}
static void lm3530_brightness_set(struct led_classdev *led_cdev,
enum led_brightness brt_val)
{
int err;
struct lm3530_data *drvdata =
container_of(led_cdev, struct lm3530_data, led_dev);
switch (drvdata->mode) {
case LM3530_BL_MODE_MANUAL:
if (!drvdata->enable) {
err = lm3530_init_registers(drvdata);
if (err) {
dev_err(&drvdata->client->dev,
"Register Init failed: %d\n", err);
break;
}
}
/* set the brightness in brightness control register*/
err = i2c_smbus_write_byte_data(drvdata->client,
LM3530_BRT_CTRL_REG, brt_val / 2);
if (err)
dev_err(&drvdata->client->dev,
"Unable to set brightness: %d\n", err);
else
drvdata->brightness = brt_val / 2;
if (brt_val == 0) {
err = regulator_disable(drvdata->regulator);
if (err)
dev_err(&drvdata->client->dev,
"Disable regulator failed\n");
drvdata->enable = false;
}
break;
case
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