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0602083706
This is basic lm3533 driver only with bank A and backlight cell support. Tested-by: Andreas Westman Dorcsak <hedmoo@yahoo.com> # LG P880 T30 Tested-by: Svyatoslav Ryhel <clamor95@gmail.com> # LG P895 T30 Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com> Reviewed-by: Simon Glass <sjg@chromium.org>
134 lines
3.2 KiB
C
134 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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