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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2022 Svyatoslav Ryhel <clamor95@gmail.com>
*/
#define LOG_CATEGORY UCLASS_PANEL_BACKLIGHT
#include <backlight.h>
#include <dm.h>
#include <dm/ofnode.h>
#include <i2c.h>
#include <log.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <asm/gpio.h>
#define LM3533_BL_MIN_BRIGHTNESS 0x02
#define LM3533_BL_MAX_BRIGHTNESS 0xFF
#define LM3533_SINK_OUTPUT_CONFIG_1 0x10
#define LM3533_CONTROL_PWM_BASE 0x14
#define PWM_MAX GENMASK(5, 0)
#define LM3533_CONTROL_BANK_AB_BRIGHTNESS 0x1A
#define LM3533_CONTROL_FULLSCALE_CURRENT_BASE 0x1F
#define MAX_CURRENT_MIN 5000
#define MAX_CURRENT_MAX 29800
#define MAX_CURRENT_STEP 800
#define LM3533_CONTROL_BANK_ENABLE 0x27
#define LM3533_OVP_FREQUENCY_PWM_POLARITY 0x2C
#define BOOST_OVP_MASK GENMASK(2, 1)
#define BOOST_OVP_SHIFT 1
#define BOOST_FREQ_MASK BIT(0)
#define BOOST_FREQ_SHIFT 0
#define LM3533_BRIGHTNESS_REGISTER_A 0x40
#define LM3533_BOOST_OVP_16V 16000000UL
#define LM3533_BOOST_FREQ_500KHZ 500000UL
struct lm3533_backlight_priv {
struct gpio_desc enable_gpio;
u32 def_bl_lvl;
/* Core */
u32 boost_ovp;
u32 boost_freq;
/* Backlight */
u32 reg;
u16 max_current; /* 5000 - 29800 uA (800 uA step) */
u8 pwm; /* 0 - 0x3f */
bool linear;
bool hvled;
};
static int lm3533_backlight_enable(struct udevice *dev)
{
struct lm3533_backlight_priv *priv = dev_get_priv(dev);
u8 val, id = priv->reg;
int ret;
if (priv->linear) {
ret = dm_i2c_reg_clrset(dev, LM3533_CONTROL_BANK_AB_BRIGHTNESS,
BIT(2 * id + 1), BIT(2 * id + 1));
if (ret)
return ret;
}
if (priv->hvled) {
ret = dm_i2c_reg_clrset(dev, LM3533_SINK_OUTPUT_CONFIG_1,
BIT(0) | BIT(1), id | id << 1);
if (ret)
return ret;
}
/* Set current */
if (priv->max_current < MAX_CURRENT_MIN || priv->max_current > MAX_CURRENT_MAX)
return -EINVAL;
val = (priv->max_current - MAX_CURRENT_MIN) / MAX_CURRENT_STEP;
ret = dm_i2c_reg_write(dev, LM3533_CONTROL_FULLSCALE_CURRENT_BASE + id, val);
if (ret)
return ret;
/* Set PWM mask */
if (priv->pwm > PWM_MAX)
return -EINVAL;
ret = dm_i2c_reg_write(dev, LM3533_CONTROL_PWM_BASE + id, priv->pwm);
if (ret)
return ret;
/* Enable Control Bank */
return dm_i2c_reg_clrset(dev, LM3533_CONTROL_BANK_ENABLE, BIT(id), BIT(id));
}
static int lm3533_backlight_set_brightness(struct udevice *dev, int percent)
{
struct lm3533_backlight_priv *priv = dev_get_priv(dev);
int ret;
if (percent == BACKLIGHT_DEFAULT)
percent = priv->def_bl_lvl;
if (percent < LM3533_BL_MIN_BRIGHTNESS)
percent = LM3533_BL_MIN_BRIGHTNESS;
if (percent > LM3533_BL_MAX_BRIGHTNESS)
percent = LM3533_BL_MAX_BRIGHTNESS;
/* Set brightness level */
ret = dm_i2c_reg_write(dev, LM3533_BRIGHTNESS_REGISTER_A,
percent);
if (ret)
return ret;
return 0;
}
static int lm3533_backlight_of_to_plat(struct udevice *dev)
{
struct lm3533_backlight_priv *priv = dev_get_priv(dev);
ofnode child;
int ret;
ret = gpio_request_by_name(dev, "enable-gpios", 0,
&priv->enable_gpio, GPIOD_IS_OUT);
if (ret) {
log_err("Could not decode enable-gpios (%d)\n", ret);
return ret;
}
priv->boost_ovp = dev_read_u32_default(dev, "ti,boost-ovp-microvolt",
LM3533_BOOST_OVP_16V);
/* boost_ovp is defined in microvolts, convert to enum value */
priv->boost_ovp = priv->boost_ovp / (8 * 1000 * 1000) - 2;
priv->boost_freq = dev_read_u32_default(dev, "ti,boost-freq-hz",
LM3533_BOOST_FREQ_500KHZ);
/* boost_freq is defined in Hz, convert to enum value */
priv->boost_freq = priv->boost_freq / (500 * 1000) - 1;
/* Backlight is one of children but has no dedicated driver */
ofnode_for_each_subnode(child, dev_ofnode(dev)) {
if (ofnode_device_is_compatible(child, "ti,lm3533-backlight")) {
const char *node_name = ofnode_get_name(child);
if (!strcmp(&node_name[10], "1"))
priv->reg = 1;
else
priv->reg = 0;
priv->max_current = ofnode_read_u32_default(child, "ti,max-current-microamp",
5000);
priv->pwm = ofnode_read_u32_default(child, "ti,pwm-config-mask", 0);
priv->def_bl_lvl = ofnode_read_u32_default(child, "default-brightness",
LM3533_BL_MAX_BRIGHTNESS);
priv->linear = ofnode_read_bool(child, "ti,linear-mapping-mode");
priv->hvled = ofnode_read_bool(child, "ti,hardware-controlled");
}
}
return 0;
}
static int lm3533_backlight_probe(struct udevice *dev)
{
struct lm3533_backlight_priv *priv = dev_get_priv(dev);
int ret;
if (device_get_uclass_id(dev->parent) != UCLASS_I2C)
return -EPROTONOSUPPORT;
dm_gpio_set_value(&priv->enable_gpio, 1);
mdelay(5);
ret = dm_i2c_reg_clrset(dev, LM3533_OVP_FREQUENCY_PWM_POLARITY,
BOOST_FREQ_MASK, priv->boost_freq << BOOST_FREQ_SHIFT);
if (ret) {
log_debug("%s: freq config failed %d\n", __func__, ret);
return ret;
}
ret = dm_i2c_reg_clrset(dev, LM3533_OVP_FREQUENCY_PWM_POLARITY,
BOOST_OVP_MASK, priv->boost_ovp << BOOST_OVP_SHIFT);
if (ret) {
log_debug("%s: ovp config failed %d\n", __func__, ret);
return ret;
}
return 0;
}
static const struct backlight_ops lm3533_backlight_ops = {
.enable = lm3533_backlight_enable,
.set_brightness = lm3533_backlight_set_brightness,
};
static const struct udevice_id lm3533_backlight_ids[] = {
{ .compatible = "ti,lm3533" },
{ }
};
U_BOOT_DRIVER(lm3533_backlight) = {
.name = "lm3533_backlight",
.id = UCLASS_PANEL_BACKLIGHT,
.of_match = lm3533_backlight_ids,
.of_to_plat = lm3533_backlight_of_to_plat,
.probe = lm3533_backlight_probe,
.ops = &lm3533_backlight_ops,
.priv_auto = sizeof(struct lm3533_backlight_priv),
};
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