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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/video/backlight/ep93xx_bl.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/video/backlight/ep93xx_bl.c')
-rw-r--r--drivers/video/backlight/ep93xx_bl.c132
1 files changed, 132 insertions, 0 deletions
diff --git a/drivers/video/backlight/ep93xx_bl.c b/drivers/video/backlight/ep93xx_bl.c
new file mode 100644
index 000000000..2387009d4
--- /dev/null
+++ b/drivers/video/backlight/ep93xx_bl.c
@@ -0,0 +1,132 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Driver for the Cirrus EP93xx lcd backlight
+ *
+ * Copyright (c) 2010 H Hartley Sweeten <hsweeten@visionengravers.com>
+ *
+ * This driver controls the pulse width modulated brightness control output,
+ * BRIGHT, on the Cirrus EP9307, EP9312, and EP9315 processors.
+ */
+
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/io.h>
+#include <linux/fb.h>
+#include <linux/backlight.h>
+
+#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)
+{
+ return ep93xxbl_set(bl, backlight_get_brightness(bl));
+}
+
+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 <hsweeten@visionengravers.com>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:ep93xx-bl");