From 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 Mon Sep 17 00:00:00 2001 From: Yunhong Jiang Date: Tue, 4 Aug 2015 12:17:53 -0700 Subject: Add the rt linux 4.1.3-rt3 as base Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang --- kernel/drivers/video/backlight/ep93xx_bl.c | 141 +++++++++++++++++++++++++++++ 1 file changed, 141 insertions(+) create mode 100644 kernel/drivers/video/backlight/ep93xx_bl.c (limited to 'kernel/drivers/video/backlight/ep93xx_bl.c') diff --git a/kernel/drivers/video/backlight/ep93xx_bl.c b/kernel/drivers/video/backlight/ep93xx_bl.c new file mode 100644 index 000000000..006793182 --- /dev/null +++ b/kernel/drivers/video/backlight/ep93xx_bl.c @@ -0,0 +1,141 @@ +/* + * Driver for the Cirrus EP93xx lcd backlight + * + * Copyright (c) 2010 H Hartley Sweeten + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This driver controls the pulse width modulated brightness control output, + * BRIGHT, on the Cirrus EP9307, EP9312, and EP9315 processors. + */ + +#include +#include +#include +#include +#include + +#define EP93XX_MAX_COUNT 255 +#define EP93XX_MAX_BRIGHT 255 +#define EP93XX_DEF_BRIGHT 128 + +struct ep93xxbl { + void __iomem *mmio; + int brightness; +}; + +static int ep93xxbl_set(struct backlight_device *bl, int brightness) +{ + struct ep93xxbl *ep93xxbl = bl_get_data(bl); + + writel((brightness << 8) | EP93XX_MAX_COUNT, ep93xxbl->mmio); + + ep93xxbl->brightness = brightness; + + return 0; +} + +static int ep93xxbl_update_status(struct backlight_device *bl) +{ + int brightness = bl->props.brightness; + + if (bl->props.power != FB_BLANK_UNBLANK || + bl->props.fb_blank != FB_BLANK_UNBLANK) + brightness = 0; + + return ep93xxbl_set(bl, brightness); +} + +static int ep93xxbl_get_brightness(struct backlight_device *bl) +{ + struct ep93xxbl *ep93xxbl = bl_get_data(bl); + + return ep93xxbl->brightness; +} + +static const struct backlight_ops ep93xxbl_ops = { + .update_status = ep93xxbl_update_status, + .get_brightness = ep93xxbl_get_brightness, +}; + +static int ep93xxbl_probe(struct platform_device *dev) +{ + struct ep93xxbl *ep93xxbl; + struct backlight_device *bl; + struct backlight_properties props; + struct resource *res; + + ep93xxbl = devm_kzalloc(&dev->dev, sizeof(*ep93xxbl), GFP_KERNEL); + if (!ep93xxbl) + return -ENOMEM; + + res = platform_get_resource(dev, IORESOURCE_MEM, 0); + if (!res) + return -ENXIO; + + /* + * FIXME - We don't do a request_mem_region here because we are + * sharing the register space with the framebuffer driver (see + * drivers/video/ep93xx-fb.c) and doing so will cause the second + * loaded driver to return -EBUSY. + * + * NOTE: No locking is required; the framebuffer does not touch + * this register. + */ + ep93xxbl->mmio = devm_ioremap(&dev->dev, res->start, + resource_size(res)); + if (!ep93xxbl->mmio) + return -ENXIO; + + memset(&props, 0, sizeof(struct backlight_properties)); + props.type = BACKLIGHT_RAW; + props.max_brightness = EP93XX_MAX_BRIGHT; + bl = devm_backlight_device_register(&dev->dev, dev->name, &dev->dev, + ep93xxbl, &ep93xxbl_ops, &props); + if (IS_ERR(bl)) + return PTR_ERR(bl); + + bl->props.brightness = EP93XX_DEF_BRIGHT; + + platform_set_drvdata(dev, bl); + + ep93xxbl_update_status(bl); + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int ep93xxbl_suspend(struct device *dev) +{ + struct backlight_device *bl = dev_get_drvdata(dev); + + return ep93xxbl_set(bl, 0); +} + +static int ep93xxbl_resume(struct device *dev) +{ + struct backlight_device *bl = dev_get_drvdata(dev); + + backlight_update_status(bl); + return 0; +} +#endif + +static SIMPLE_DEV_PM_OPS(ep93xxbl_pm_ops, ep93xxbl_suspend, ep93xxbl_resume); + +static struct platform_driver ep93xxbl_driver = { + .driver = { + .name = "ep93xx-bl", + .pm = &ep93xxbl_pm_ops, + }, + .probe = ep93xxbl_probe, +}; + +module_platform_driver(ep93xxbl_driver); + +MODULE_DESCRIPTION("EP93xx Backlight Driver"); +MODULE_AUTHOR("H Hartley Sweeten "); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:ep93xx-bl"); -- cgit 1.2.3-korg