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161 lines
4.0 KiB
161 lines
4.0 KiB
// 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 <[email protected]> |
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* |
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* Copyright (C) 2006-2008 Marvell International Ltd. |
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* Eric Miao <[email protected]> |
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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 <[email protected]>"); |
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MODULE_AUTHOR("Mike Rapoport <[email protected]>"); |
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MODULE_LICENSE("GPL"); |
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MODULE_ALIAS("platform:da903x-backlight");
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