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157 lines
3.4 KiB
157 lines
3.4 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* drivers/video/backlight/platform_lcd.c |
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* |
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* Copyright 2008 Simtec Electronics |
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* Ben Dooks <[email protected]> |
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* |
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* Generic platform-device LCD power control interface. |
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*/ |
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#include <linux/module.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/lcd.h> |
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#include <linux/of.h> |
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#include <linux/slab.h> |
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#include <video/platform_lcd.h> |
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struct platform_lcd { |
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struct device *us; |
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struct lcd_device *lcd; |
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struct plat_lcd_data *pdata; |
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unsigned int power; |
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unsigned int suspended:1; |
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}; |
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static inline struct platform_lcd *to_our_lcd(struct lcd_device *lcd) |
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{ |
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return lcd_get_data(lcd); |
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} |
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static int platform_lcd_get_power(struct lcd_device *lcd) |
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{ |
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struct platform_lcd *plcd = to_our_lcd(lcd); |
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return plcd->power; |
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} |
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static int platform_lcd_set_power(struct lcd_device *lcd, int power) |
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{ |
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struct platform_lcd *plcd = to_our_lcd(lcd); |
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int lcd_power = 1; |
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if (power == FB_BLANK_POWERDOWN || plcd->suspended) |
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lcd_power = 0; |
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plcd->pdata->set_power(plcd->pdata, lcd_power); |
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plcd->power = power; |
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return 0; |
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} |
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static int platform_lcd_match(struct lcd_device *lcd, struct fb_info *info) |
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{ |
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struct platform_lcd *plcd = to_our_lcd(lcd); |
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struct plat_lcd_data *pdata = plcd->pdata; |
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if (pdata->match_fb) |
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return pdata->match_fb(pdata, info); |
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return plcd->us->parent == info->device; |
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} |
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static struct lcd_ops platform_lcd_ops = { |
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.get_power = platform_lcd_get_power, |
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.set_power = platform_lcd_set_power, |
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.check_fb = platform_lcd_match, |
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}; |
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static int platform_lcd_probe(struct platform_device *pdev) |
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{ |
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struct plat_lcd_data *pdata; |
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struct platform_lcd *plcd; |
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struct device *dev = &pdev->dev; |
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int err; |
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pdata = dev_get_platdata(&pdev->dev); |
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if (!pdata) { |
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dev_err(dev, "no platform data supplied\n"); |
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return -EINVAL; |
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} |
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if (pdata->probe) { |
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err = pdata->probe(pdata); |
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if (err) |
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return err; |
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} |
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plcd = devm_kzalloc(&pdev->dev, sizeof(struct platform_lcd), |
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GFP_KERNEL); |
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if (!plcd) |
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return -ENOMEM; |
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plcd->us = dev; |
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plcd->pdata = pdata; |
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plcd->lcd = devm_lcd_device_register(&pdev->dev, dev_name(dev), dev, |
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plcd, &platform_lcd_ops); |
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if (IS_ERR(plcd->lcd)) { |
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dev_err(dev, "cannot register lcd device\n"); |
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return PTR_ERR(plcd->lcd); |
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} |
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platform_set_drvdata(pdev, plcd); |
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platform_lcd_set_power(plcd->lcd, FB_BLANK_NORMAL); |
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return 0; |
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} |
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#ifdef CONFIG_PM_SLEEP |
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static int platform_lcd_suspend(struct device *dev) |
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{ |
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struct platform_lcd *plcd = dev_get_drvdata(dev); |
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plcd->suspended = 1; |
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platform_lcd_set_power(plcd->lcd, plcd->power); |
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return 0; |
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} |
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static int platform_lcd_resume(struct device *dev) |
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{ |
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struct platform_lcd *plcd = dev_get_drvdata(dev); |
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plcd->suspended = 0; |
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platform_lcd_set_power(plcd->lcd, plcd->power); |
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return 0; |
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} |
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#endif |
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static SIMPLE_DEV_PM_OPS(platform_lcd_pm_ops, platform_lcd_suspend, |
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platform_lcd_resume); |
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#ifdef CONFIG_OF |
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static const struct of_device_id platform_lcd_of_match[] = { |
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{ .compatible = "platform-lcd" }, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(of, platform_lcd_of_match); |
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#endif |
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static struct platform_driver platform_lcd_driver = { |
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.driver = { |
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.name = "platform-lcd", |
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.pm = &platform_lcd_pm_ops, |
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.of_match_table = of_match_ptr(platform_lcd_of_match), |
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}, |
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.probe = platform_lcd_probe, |
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}; |
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module_platform_driver(platform_lcd_driver); |
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MODULE_AUTHOR("Ben Dooks <[email protected]>"); |
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MODULE_LICENSE("GPL v2"); |
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MODULE_ALIAS("platform:platform-lcd");
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