mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-12 06:06:15 +09:00
d024236e5a
We have a large number of places where while we historically referenced gd in the code we no longer do, as well as cases where the code added that line "just in case" during development and never dropped it. Signed-off-by: Tom Rini <trini@konsulko.com>
135 lines
3.3 KiB
C
135 lines
3.3 KiB
C
/*
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* Copyright (c) 2016 Google, Inc
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* Written by Simon Glass <sjg@chromium.org>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <dm.h>
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#include <backlight.h>
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#include <pwm.h>
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#include <asm/gpio.h>
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#include <power/regulator.h>
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struct pwm_backlight_priv {
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struct udevice *reg;
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struct gpio_desc enable;
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struct udevice *pwm;
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uint channel;
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uint period_ns;
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uint default_level;
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uint min_level;
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uint max_level;
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};
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static int pwm_backlight_enable(struct udevice *dev)
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{
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struct pwm_backlight_priv *priv = dev_get_priv(dev);
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struct dm_regulator_uclass_platdata *plat;
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uint duty_cycle;
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int ret;
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if (priv->reg) {
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plat = dev_get_uclass_platdata(priv->reg);
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debug("%s: Enable '%s', regulator '%s'/'%s'\n", __func__,
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dev->name, priv->reg->name, plat->name);
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ret = regulator_set_enable(priv->reg, true);
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if (ret) {
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debug("%s: Cannot enable regulator for PWM '%s'\n",
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__func__, dev->name);
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return ret;
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}
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mdelay(120);
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}
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duty_cycle = priv->period_ns * (priv->default_level - priv->min_level) /
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(priv->max_level - priv->min_level + 1);
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ret = pwm_set_config(priv->pwm, priv->channel, priv->period_ns,
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duty_cycle);
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if (ret)
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return ret;
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ret = pwm_set_enable(priv->pwm, priv->channel, true);
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if (ret)
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return ret;
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mdelay(10);
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dm_gpio_set_value(&priv->enable, 1);
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return 0;
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}
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static int pwm_backlight_ofdata_to_platdata(struct udevice *dev)
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{
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struct pwm_backlight_priv *priv = dev_get_priv(dev);
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struct ofnode_phandle_args args;
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int index, ret, count, len;
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const u32 *cell;
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debug("%s: start\n", __func__);
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ret = uclass_get_device_by_phandle(UCLASS_REGULATOR, dev,
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"power-supply", &priv->reg);
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if (ret)
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debug("%s: Cannot get power supply: ret=%d\n", __func__, ret);
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ret = gpio_request_by_name(dev, "enable-gpios", 0, &priv->enable,
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GPIOD_IS_OUT);
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if (ret) {
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debug("%s: Warning: cannot get enable GPIO: ret=%d\n",
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__func__, ret);
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if (ret != -ENOENT)
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return ret;
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}
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ret = dev_read_phandle_with_args(dev, "pwms", "#pwm-cells", 0, 0,
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&args);
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if (ret) {
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debug("%s: Cannot get PWM phandle: ret=%d\n", __func__, ret);
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return ret;
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}
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ret = uclass_get_device_by_ofnode(UCLASS_PWM, args.node, &priv->pwm);
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if (ret) {
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debug("%s: Cannot get PWM: ret=%d\n", __func__, ret);
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return ret;
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}
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priv->channel = args.args[0];
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priv->period_ns = args.args[1];
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index = dev_read_u32_default(dev, "default-brightness-level", 255);
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cell = dev_read_prop(dev, "brightness-levels", &len);
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count = len / sizeof(u32);
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if (cell && count > index) {
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priv->default_level = fdt32_to_cpu(cell[index]);
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priv->max_level = fdt32_to_cpu(cell[count - 1]);
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} else {
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priv->default_level = index;
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priv->max_level = 255;
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}
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debug("%s: done\n", __func__);
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return 0;
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}
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static int pwm_backlight_probe(struct udevice *dev)
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{
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return 0;
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}
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static const struct backlight_ops pwm_backlight_ops = {
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.enable = pwm_backlight_enable,
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};
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static const struct udevice_id pwm_backlight_ids[] = {
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{ .compatible = "pwm-backlight" },
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{ }
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};
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U_BOOT_DRIVER(pwm_backlight) = {
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.name = "pwm_backlight",
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.id = UCLASS_PANEL_BACKLIGHT,
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.of_match = pwm_backlight_ids,
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.ops = &pwm_backlight_ops,
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.ofdata_to_platdata = pwm_backlight_ofdata_to_platdata,
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.probe = pwm_backlight_probe,
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.priv_auto_alloc_size = sizeof(struct pwm_backlight_priv),
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};
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