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e503be022f
Add support for National Semiconductor/TI LP8550/1/2/3/5/6/7 LED Backlight. Driver is based on Linux version but is reworked and optimised for U-Boot DM framework. Currently only register driven backlight control is supported, PWM driver backlight control may be added later if needed. Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
303 lines
7.5 KiB
C
303 lines
7.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2011 Texas Instruments
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* Copyright (c) 2024 Svyatoslav Ryhel <clamor95@gmail.com>
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*/
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#define LOG_CATEGORY UCLASS_PANEL_BACKLIGHT
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#include <malloc.h>
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#include <backlight.h>
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#include <dm.h>
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#include <dm/devres.h>
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#include <i2c.h>
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#include <log.h>
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#include <linux/delay.h>
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#include <linux/err.h>
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#include <asm/gpio.h>
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#include <power/regulator.h>
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#define LP855x_MIN_BRIGHTNESS 0x00
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#define LP855x_MAX_BRIGHTNESS 0xff
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/* LP8550/1/2/3/6 Registers */
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#define LP855X_BRIGHTNESS_CTRL 0x00
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#define LP855X_DEVICE_CTRL 0x01
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#define LP855X_EEPROM_START 0xa0
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#define LP855X_EEPROM_END 0xa7
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#define LP8556_EPROM_START 0x98
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#define LP8556_EPROM_END 0xaf
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/* LP8555/7 Registers */
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#define LP8557_BL_CMD 0x00
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#define LP8557_BL_MASK 0x01
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#define LP8557_BL_ON 0x01
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#define LP8557_BL_OFF 0x00
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#define LP8557_BRIGHTNESS_CTRL 0x04
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#define LP8557_CONFIG 0x10
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#define LP8555_EPROM_START 0x10
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#define LP8555_EPROM_END 0x7a
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#define LP8557_EPROM_START 0x10
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#define LP8557_EPROM_END 0x1e
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struct lp855x_rom_data {
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u8 addr;
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u8 val;
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};
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struct lp855x_backlight_priv;
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/*
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* struct lp855x_device_config
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* @pre_init_device: init device function call before updating the brightness
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* @reg_brightness: register address for brigthenss control
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* @reg_devicectrl: register address for device control
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* @post_init_device: late init device function call
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*/
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struct lp855x_device_config {
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int (*pre_init_device)(struct udevice *dev);
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u8 reg_brightness;
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u8 reg_devicectrl;
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u8 reg_eepromstart;
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u8 reg_eepromend;
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int (*post_init_device)(struct udevice *dev);
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};
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struct lp855x_backlight_priv {
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struct udevice *supply; /* regulator for VDD input */
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struct udevice *enable; /* regulator for EN/VDDIO input */
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u8 device_control;
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u8 initial_brightness;
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int size_program;
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struct lp855x_rom_data *rom_data;
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struct lp855x_device_config *cfg;
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};
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static int lp855x_backlight_enable(struct udevice *dev)
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{
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struct lp855x_backlight_priv *priv = dev_get_priv(dev);
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int ret;
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ret = regulator_set_enable_if_allowed(priv->supply, 1);
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if (ret) {
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log_debug("%s: enabling power-supply failed (%d)\n",
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__func__, ret);
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return ret;
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}
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ret = regulator_set_enable_if_allowed(priv->enable, 1);
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if (ret) {
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log_debug("%s: enabling enable-supply failed (%d)\n",
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__func__, ret);
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return ret;
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}
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mdelay(2);
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if (priv->cfg->pre_init_device) {
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ret = priv->cfg->pre_init_device(dev);
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if (ret) {
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log_debug("%s: pre init device err: %d\n",
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__func__, ret);
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return ret;
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}
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}
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ret = dm_i2c_reg_write(dev, priv->cfg->reg_brightness,
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priv->initial_brightness);
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if (ret)
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return ret;
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ret = dm_i2c_reg_write(dev, priv->cfg->reg_devicectrl,
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priv->device_control);
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if (ret)
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return ret;
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if (priv->size_program > 0) {
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int i;
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u8 val, addr;
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for (i = 0; i < priv->size_program; i++) {
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addr = priv->rom_data[i].addr;
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val = priv->rom_data[i].val;
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if (addr < priv->cfg->reg_eepromstart &&
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addr > priv->cfg->reg_eepromend)
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continue;
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ret = dm_i2c_reg_write(dev, addr, val);
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if (ret)
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return ret;
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}
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}
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if (priv->cfg->post_init_device) {
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ret = priv->cfg->post_init_device(dev);
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if (ret) {
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log_debug("%s: post init device err: %d\n",
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__func__, ret);
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return ret;
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}
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}
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return 0;
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}
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static int lp855x_backlight_set_brightness(struct udevice *dev, int percent)
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{
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struct lp855x_backlight_priv *priv = dev_get_priv(dev);
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if (percent == BACKLIGHT_DEFAULT)
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percent = priv->initial_brightness;
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if (percent < LP855x_MIN_BRIGHTNESS)
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percent = LP855x_MIN_BRIGHTNESS;
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if (percent > LP855x_MAX_BRIGHTNESS)
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percent = LP855x_MAX_BRIGHTNESS;
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/* Set brightness level */
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return dm_i2c_reg_write(dev, priv->cfg->reg_brightness,
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percent);
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}
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static int lp855x_backlight_probe(struct udevice *dev)
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{
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struct lp855x_backlight_priv *priv = dev_get_priv(dev);
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int rom_length, ret;
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if (device_get_uclass_id(dev->parent) != UCLASS_I2C)
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return -EPROTONOSUPPORT;
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priv->cfg = (struct lp855x_device_config *)dev_get_driver_data(dev);
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dev_read_u8(dev, "dev-ctrl", &priv->device_control);
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dev_read_u8(dev, "init-brt", &priv->initial_brightness);
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/* Fill ROM platform data if defined */
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rom_length = dev_get_child_count(dev);
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if (rom_length > 0) {
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struct lp855x_rom_data *rom;
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ofnode child;
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int i = 0;
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rom = devm_kcalloc(dev, rom_length, sizeof(*rom), GFP_KERNEL);
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if (!rom)
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return -ENOMEM;
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dev_for_each_subnode(child, dev) {
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ofnode_read_u8(child, "rom-addr", &rom[i].addr);
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ofnode_read_u8(child, "rom-val", &rom[i].val);
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i++;
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}
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priv->size_program = rom_length;
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priv->rom_data = &rom[0];
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}
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ret = uclass_get_device_by_phandle(UCLASS_REGULATOR, dev,
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"power-supply", &priv->supply);
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if (ret) {
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log_err("%s: cannot get power-supply: ret = %d\n", __func__, ret);
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return ret;
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}
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ret = uclass_get_device_by_phandle(UCLASS_REGULATOR, dev,
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"enable-supply", &priv->enable);
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if (ret) {
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log_err("%s: cannot get enable-supply: ret = %d\n", __func__, ret);
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return ret;
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}
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return 0;
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}
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static const struct backlight_ops lp855x_backlight_ops = {
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.enable = lp855x_backlight_enable,
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.set_brightness = lp855x_backlight_set_brightness,
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};
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static int lp8556_bl_rst(struct udevice *dev)
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{
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int ret;
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/* Reset backlight after updating EPROM settings */
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ret = dm_i2c_reg_clrset(dev, LP855X_DEVICE_CTRL, LP8557_BL_MASK,
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LP8557_BL_OFF);
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if (ret)
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return ret;
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mdelay(10);
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return dm_i2c_reg_clrset(dev, LP855X_DEVICE_CTRL, LP8557_BL_MASK,
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LP8557_BL_ON);
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}
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static int lp8557_bl_off(struct udevice *dev)
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{
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/* BL_ON = 0 before updating EPROM settings */
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return dm_i2c_reg_clrset(dev, LP8557_BL_CMD, LP8557_BL_MASK,
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LP8557_BL_OFF);
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}
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static int lp8557_bl_on(struct udevice *dev)
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{
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/* BL_ON = 1 after updating EPROM settings */
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return dm_i2c_reg_clrset(dev, LP8557_BL_CMD, LP8557_BL_MASK,
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LP8557_BL_ON);
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}
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static struct lp855x_device_config lp855x_dev_cfg = {
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.reg_brightness = LP855X_BRIGHTNESS_CTRL,
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.reg_devicectrl = LP855X_DEVICE_CTRL,
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.reg_eepromstart = LP855X_EEPROM_START,
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.reg_eepromend = LP855X_EEPROM_END,
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};
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static struct lp855x_device_config lp8555_dev_cfg = {
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.reg_brightness = LP8557_BRIGHTNESS_CTRL,
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.reg_devicectrl = LP8557_CONFIG,
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.reg_eepromstart = LP8555_EPROM_START,
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.reg_eepromend = LP8555_EPROM_END,
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.pre_init_device = lp8557_bl_off,
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.post_init_device = lp8557_bl_on,
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};
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static struct lp855x_device_config lp8556_dev_cfg = {
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.reg_brightness = LP855X_BRIGHTNESS_CTRL,
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.reg_devicectrl = LP855X_DEVICE_CTRL,
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.reg_eepromstart = LP8556_EPROM_START,
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.reg_eepromend = LP8556_EPROM_END,
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.post_init_device = lp8556_bl_rst,
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};
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static struct lp855x_device_config lp8557_dev_cfg = {
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.reg_brightness = LP8557_BRIGHTNESS_CTRL,
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.reg_devicectrl = LP8557_CONFIG,
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.reg_eepromstart = LP8557_EPROM_START,
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.reg_eepromend = LP8557_EPROM_END,
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.pre_init_device = lp8557_bl_off,
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.post_init_device = lp8557_bl_on,
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};
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static const struct udevice_id lp855x_backlight_ids[] = {
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{ .compatible = "ti,lp8550", .data = (ulong)&lp855x_dev_cfg },
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{ .compatible = "ti,lp8551", .data = (ulong)&lp855x_dev_cfg },
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{ .compatible = "ti,lp8552", .data = (ulong)&lp855x_dev_cfg },
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{ .compatible = "ti,lp8553", .data = (ulong)&lp855x_dev_cfg },
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{ .compatible = "ti,lp8555", .data = (ulong)&lp8555_dev_cfg },
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{ .compatible = "ti,lp8556", .data = (ulong)&lp8556_dev_cfg },
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{ .compatible = "ti,lp8557", .data = (ulong)&lp8557_dev_cfg },
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{ }
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};
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U_BOOT_DRIVER(lp855x_backlight) = {
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.name = "lp855x_backlight",
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.id = UCLASS_PANEL_BACKLIGHT,
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.of_match = lp855x_backlight_ids,
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.probe = lp855x_backlight_probe,
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.ops = &lp855x_backlight_ops,
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.priv_auto = sizeof(struct lp855x_backlight_priv),
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};
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