162 lines
4.0 KiB
C
162 lines
4.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Backlight driver for Dialog Semiconductor DA9030/DA9034
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*
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* Copyright (C) 2008 Compulab, Ltd.
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* Mike Rapoport <mike@compulab.co.il>
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*
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* Copyright (C) 2006-2008 Marvell International Ltd.
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* Eric Miao <eric.miao@marvell.com>
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/fb.h>
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#include <linux/backlight.h>
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#include <linux/mfd/da903x.h>
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#include <linux/slab.h>
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#include <linux/module.h>
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#define DA9030_WLED_CONTROL 0x25
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#define DA9030_WLED_CP_EN (1 << 6)
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#define DA9030_WLED_TRIM(x) ((x) & 0x7)
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#define DA9034_WLED_CONTROL1 0x3C
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#define DA9034_WLED_CONTROL2 0x3D
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#define DA9034_WLED_ISET(x) ((x) & 0x1f)
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#define DA9034_WLED_BOOST_EN (1 << 5)
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#define DA9030_MAX_BRIGHTNESS 7
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#define DA9034_MAX_BRIGHTNESS 0x7f
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struct da903x_backlight_data {
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struct device *da903x_dev;
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int id;
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int current_brightness;
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};
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static int da903x_backlight_set(struct backlight_device *bl, int brightness)
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{
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struct da903x_backlight_data *data = bl_get_data(bl);
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struct device *dev = data->da903x_dev;
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uint8_t val;
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int ret = 0;
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switch (data->id) {
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case DA9034_ID_WLED:
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ret = da903x_update(dev, DA9034_WLED_CONTROL1,
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brightness, 0x7f);
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if (ret)
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return ret;
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if (data->current_brightness && brightness == 0)
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ret = da903x_clr_bits(dev,
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DA9034_WLED_CONTROL2,
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DA9034_WLED_BOOST_EN);
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if (data->current_brightness == 0 && brightness)
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ret = da903x_set_bits(dev,
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DA9034_WLED_CONTROL2,
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DA9034_WLED_BOOST_EN);
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break;
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case DA9030_ID_WLED:
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val = DA9030_WLED_TRIM(brightness);
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val |= brightness ? DA9030_WLED_CP_EN : 0;
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ret = da903x_write(dev, DA9030_WLED_CONTROL, val);
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break;
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}
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if (ret)
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return ret;
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data->current_brightness = brightness;
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return 0;
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}
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static int da903x_backlight_update_status(struct backlight_device *bl)
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{
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return da903x_backlight_set(bl, backlight_get_brightness(bl));
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}
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static int da903x_backlight_get_brightness(struct backlight_device *bl)
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{
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struct da903x_backlight_data *data = bl_get_data(bl);
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return data->current_brightness;
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}
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static const struct backlight_ops da903x_backlight_ops = {
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.options = BL_CORE_SUSPENDRESUME,
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.update_status = da903x_backlight_update_status,
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.get_brightness = da903x_backlight_get_brightness,
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};
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static int da903x_backlight_probe(struct platform_device *pdev)
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{
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struct da9034_backlight_pdata *pdata = dev_get_platdata(&pdev->dev);
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struct da903x_backlight_data *data;
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struct backlight_device *bl;
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struct backlight_properties props;
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int max_brightness;
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data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
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if (data == NULL)
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return -ENOMEM;
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switch (pdev->id) {
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case DA9030_ID_WLED:
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max_brightness = DA9030_MAX_BRIGHTNESS;
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break;
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case DA9034_ID_WLED:
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max_brightness = DA9034_MAX_BRIGHTNESS;
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break;
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default:
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dev_err(&pdev->dev, "invalid backlight device ID(%d)\n",
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pdev->id);
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return -EINVAL;
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}
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data->id = pdev->id;
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data->da903x_dev = pdev->dev.parent;
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data->current_brightness = 0;
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/* adjust the WLED output current */
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if (pdata)
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da903x_write(data->da903x_dev, DA9034_WLED_CONTROL2,
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DA9034_WLED_ISET(pdata->output_current));
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memset(&props, 0, sizeof(props));
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props.type = BACKLIGHT_RAW;
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props.max_brightness = max_brightness;
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bl = devm_backlight_device_register(&pdev->dev, pdev->name,
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data->da903x_dev, data,
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&da903x_backlight_ops, &props);
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if (IS_ERR(bl)) {
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dev_err(&pdev->dev, "failed to register backlight\n");
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return PTR_ERR(bl);
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}
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bl->props.brightness = max_brightness;
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platform_set_drvdata(pdev, bl);
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backlight_update_status(bl);
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return 0;
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}
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static struct platform_driver da903x_backlight_driver = {
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.driver = {
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.name = "da903x-backlight",
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},
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.probe = da903x_backlight_probe,
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};
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module_platform_driver(da903x_backlight_driver);
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MODULE_DESCRIPTION("Backlight Driver for Dialog Semiconductor DA9030/DA9034");
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MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>");
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MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:da903x-backlight");
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