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180 lines
3.9 KiB
180 lines
3.9 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* Backlight Driver for Dialog DA9052 PMICs |
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* |
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* Copyright(c) 2012 Dialog Semiconductor Ltd. |
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* |
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* Author: David Dajun Chen <[email protected]> |
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*/ |
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#include <linux/backlight.h> |
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#include <linux/delay.h> |
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#include <linux/fb.h> |
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#include <linux/module.h> |
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#include <linux/platform_device.h> |
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#include <linux/mfd/da9052/da9052.h> |
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#include <linux/mfd/da9052/reg.h> |
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#define DA9052_MAX_BRIGHTNESS 0xFF |
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enum { |
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DA9052_WLEDS_OFF, |
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DA9052_WLEDS_ON, |
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}; |
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enum { |
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DA9052_TYPE_WLED1, |
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DA9052_TYPE_WLED2, |
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DA9052_TYPE_WLED3, |
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}; |
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static const unsigned char wled_bank[] = { |
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DA9052_LED1_CONF_REG, |
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DA9052_LED2_CONF_REG, |
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DA9052_LED3_CONF_REG, |
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}; |
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struct da9052_bl { |
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struct da9052 *da9052; |
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uint brightness; |
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uint state; |
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uint led_reg; |
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}; |
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static int da9052_adjust_wled_brightness(struct da9052_bl *wleds) |
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{ |
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unsigned char boost_en; |
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unsigned char i_sink; |
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int ret; |
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boost_en = 0x3F; |
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i_sink = 0xFF; |
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if (wleds->state == DA9052_WLEDS_OFF) { |
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boost_en = 0x00; |
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i_sink = 0x00; |
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} |
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ret = da9052_reg_write(wleds->da9052, DA9052_BOOST_REG, boost_en); |
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if (ret < 0) |
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return ret; |
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ret = da9052_reg_write(wleds->da9052, DA9052_LED_CONT_REG, i_sink); |
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if (ret < 0) |
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return ret; |
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ret = da9052_reg_write(wleds->da9052, wled_bank[wleds->led_reg], 0x0); |
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if (ret < 0) |
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return ret; |
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usleep_range(10000, 11000); |
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if (wleds->brightness) { |
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ret = da9052_reg_write(wleds->da9052, wled_bank[wleds->led_reg], |
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wleds->brightness); |
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if (ret < 0) |
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return ret; |
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} |
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return 0; |
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} |
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static int da9052_backlight_update_status(struct backlight_device *bl) |
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{ |
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int brightness = bl->props.brightness; |
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struct da9052_bl *wleds = bl_get_data(bl); |
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wleds->brightness = brightness; |
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wleds->state = DA9052_WLEDS_ON; |
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return da9052_adjust_wled_brightness(wleds); |
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} |
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static int da9052_backlight_get_brightness(struct backlight_device *bl) |
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{ |
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struct da9052_bl *wleds = bl_get_data(bl); |
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return wleds->brightness; |
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} |
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static const struct backlight_ops da9052_backlight_ops = { |
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.update_status = da9052_backlight_update_status, |
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.get_brightness = da9052_backlight_get_brightness, |
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}; |
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static int da9052_backlight_probe(struct platform_device *pdev) |
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{ |
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struct backlight_device *bl; |
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struct backlight_properties props; |
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struct da9052_bl *wleds; |
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wleds = devm_kzalloc(&pdev->dev, sizeof(struct da9052_bl), GFP_KERNEL); |
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if (!wleds) |
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return -ENOMEM; |
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wleds->da9052 = dev_get_drvdata(pdev->dev.parent); |
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wleds->brightness = 0; |
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wleds->led_reg = platform_get_device_id(pdev)->driver_data; |
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wleds->state = DA9052_WLEDS_OFF; |
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props.type = BACKLIGHT_RAW; |
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props.max_brightness = DA9052_MAX_BRIGHTNESS; |
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bl = devm_backlight_device_register(&pdev->dev, pdev->name, |
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wleds->da9052->dev, wleds, |
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&da9052_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.max_brightness = DA9052_MAX_BRIGHTNESS; |
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bl->props.brightness = 0; |
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platform_set_drvdata(pdev, bl); |
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return da9052_adjust_wled_brightness(wleds); |
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} |
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static int da9052_backlight_remove(struct platform_device *pdev) |
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{ |
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struct backlight_device *bl = platform_get_drvdata(pdev); |
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struct da9052_bl *wleds = bl_get_data(bl); |
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wleds->brightness = 0; |
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wleds->state = DA9052_WLEDS_OFF; |
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da9052_adjust_wled_brightness(wleds); |
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return 0; |
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} |
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static const struct platform_device_id da9052_wled_ids[] = { |
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{ |
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.name = "da9052-wled1", |
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.driver_data = DA9052_TYPE_WLED1, |
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}, |
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{ |
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.name = "da9052-wled2", |
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.driver_data = DA9052_TYPE_WLED2, |
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}, |
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{ |
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.name = "da9052-wled3", |
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.driver_data = DA9052_TYPE_WLED3, |
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}, |
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{ }, |
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}; |
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MODULE_DEVICE_TABLE(platform, da9052_wled_ids); |
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static struct platform_driver da9052_wled_driver = { |
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.probe = da9052_backlight_probe, |
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.remove = da9052_backlight_remove, |
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.id_table = da9052_wled_ids, |
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.driver = { |
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.name = "da9052-wled", |
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}, |
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}; |
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module_platform_driver(da9052_wled_driver); |
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MODULE_AUTHOR("David Dajun Chen <[email protected]>"); |
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MODULE_DESCRIPTION("Backlight driver for DA9052 PMIC"); |
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MODULE_LICENSE("GPL");
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