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https://xff.cz/git/u-boot/
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d678a59d2d
When bringing in the series 'arm: dts: am62-beagleplay: Fix Beagleplay Ethernet"' I failed to notice that b4 noticed it was based on next and so took that as the base commit and merged that part of next to master. This reverts commitc8ffd1356d, reversing changes made to2ee6f3a5f7. Reported-by: Jonas Karlman <jonas@kwiboo.se> Signed-off-by: Tom Rini <trini@konsulko.com>
135 lines
3.2 KiB
C
135 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (c) 2022 Svyatoslav Ryhel <clamor95@gmail.com>
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*/
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#define LOG_CATEGORY UCLASS_PANEL_BACKLIGHT
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#include <backlight.h>
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#include <common.h>
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#include <dm.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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#define LM3533_BL_MIN_BRIGHTNESS 0x02
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#define LM3533_BL_MAX_BRIGHTNESS 0xFF
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#define LM3533_SINK_OUTPUT_CONFIG_1 0x10
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#define LM3533_CONTROL_BANK_A_PWM 0x14
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#define LM3533_CONTROL_BANK_AB_BRIGHTNESS 0x1A
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#define LM3533_CONTROL_BANK_A_FULLSCALE_CURRENT 0x1F
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#define LM3533_CONTROL_BANK_ENABLE 0x27
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#define LM3533_OVP_FREQUENCY_PWM_POLARITY 0x2C
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#define LM3533_BRIGHTNESS_REGISTER_A 0x40
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struct lm3533_backlight_priv {
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struct gpio_desc enable_gpio;
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u32 def_bl_lvl;
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};
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static int lm3533_backlight_enable(struct udevice *dev)
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{
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struct lm3533_backlight_priv *priv = dev_get_priv(dev);
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int ret;
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dm_gpio_set_value(&priv->enable_gpio, 1);
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mdelay(5);
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/* HVLED 1 & 2 are controlled by Bank A */
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ret = dm_i2c_reg_write(dev, LM3533_SINK_OUTPUT_CONFIG_1, 0x00);
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if (ret)
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return ret;
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/* PWM input is disabled for CABC */
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ret = dm_i2c_reg_write(dev, LM3533_CONTROL_BANK_A_PWM, 0x00);
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if (ret)
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return ret;
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/* Linear & Control Bank A is configured for register Current control */
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ret = dm_i2c_reg_write(dev, LM3533_CONTROL_BANK_AB_BRIGHTNESS, 0x02);
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if (ret)
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return ret;
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/* Full-Scale Current (20.2mA) */
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ret = dm_i2c_reg_write(dev, LM3533_CONTROL_BANK_A_FULLSCALE_CURRENT, 0x13);
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if (ret)
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return ret;
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/* Control Bank A is enable */
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ret = dm_i2c_reg_write(dev, LM3533_CONTROL_BANK_ENABLE, 0x01);
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if (ret)
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return ret;
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ret = dm_i2c_reg_write(dev, LM3533_OVP_FREQUENCY_PWM_POLARITY, 0x0A);
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if (ret)
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return ret;
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return 0;
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}
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static int lm3533_backlight_set_brightness(struct udevice *dev, int percent)
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{
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struct lm3533_backlight_priv *priv = dev_get_priv(dev);
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int ret;
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if (percent == BACKLIGHT_DEFAULT)
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percent = priv->def_bl_lvl;
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if (percent < LM3533_BL_MIN_BRIGHTNESS)
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percent = LM3533_BL_MIN_BRIGHTNESS;
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if (percent > LM3533_BL_MAX_BRIGHTNESS)
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percent = LM3533_BL_MAX_BRIGHTNESS;
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/* Set brightness level */
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ret = dm_i2c_reg_write(dev, LM3533_BRIGHTNESS_REGISTER_A,
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percent);
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if (ret)
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return ret;
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return 0;
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}
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static int lm3533_backlight_probe(struct udevice *dev)
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{
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struct lm3533_backlight_priv *priv = dev_get_priv(dev);
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int ret;
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if (device_get_uclass_id(dev->parent) != UCLASS_I2C)
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return -EPROTONOSUPPORT;
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ret = gpio_request_by_name(dev, "enable-gpios", 0,
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&priv->enable_gpio, GPIOD_IS_OUT);
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if (ret) {
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log_err("Could not decode enable-gpios (%d)\n", ret);
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return ret;
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}
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priv->def_bl_lvl = dev_read_u32_default(dev, "default-brightness-level",
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LM3533_BL_MAX_BRIGHTNESS);
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return 0;
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}
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static const struct backlight_ops lm3533_backlight_ops = {
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.enable = lm3533_backlight_enable,
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.set_brightness = lm3533_backlight_set_brightness,
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};
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static const struct udevice_id lm3533_backlight_ids[] = {
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{ .compatible = "ti,lm3533" },
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{ }
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};
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U_BOOT_DRIVER(lm3533_backlight) = {
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.name = "lm3533_backlight",
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.id = UCLASS_PANEL_BACKLIGHT,
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.of_match = lm3533_backlight_ids,
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.probe = lm3533_backlight_probe,
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.ops = &lm3533_backlight_ops,
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.priv_auto = sizeof(struct lm3533_backlight_priv),
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};
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