From: Felipe Balbi <felipe.balbi@xxxxxxxxx>
Signed-off-by: Felipe Balbi <felipe.balbi@xxxxxxxxx>
---
drivers/video/backlight/Kconfig | 9 ++
drivers/video/backlight/Makefile | 1 +
drivers/video/backlight/omap_bl.c | 218 +++++++++++++++++++++++++++++++++++++
3 files changed, 228 insertions(+), 0 deletions(-)
create mode 100644 drivers/video/backlight/omap_bl.c
diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
index 452b770..6b8cb23 100644
--- a/drivers/video/backlight/Kconfig
+++ b/drivers/video/backlight/Kconfig
@@ -133,6 +133,15 @@ config BACKLIGHT_HP680
If you have a HP Jornada 680, say y to enable the
backlight driver.
+config BACKLIGHT_OMAP
+ tristate "OMAP LCD Backlight"
+ depends on BACKLIGHT_CLASS_DEVICE && (ARCH_OMAP1 || ARCH_OMAP2)
+ default y
+ help
+ This driver controls the LCD backlight level and power
+ for the PWL module of OMAP processors. Say Y if you plan
+ to use power saving.
+
config BACKLIGHT_PROGEAR
tristate "Frontpath ProGear Backlight Driver"
depends on BACKLIGHT_CLASS_DEVICE && PCI && X86
diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
index b405aac..a317041 100644
--- a/drivers/video/backlight/Makefile
+++ b/drivers/video/backlight/Makefile
@@ -12,6 +12,7 @@ obj-$(CONFIG_BACKLIGHT_CORGI) += corgi_bl.o
obj-$(CONFIG_BACKLIGHT_HP680) += hp680_bl.o
obj-$(CONFIG_BACKLIGHT_LOCOMO) += locomolcd.o
obj-$(CONFIG_BACKLIGHT_OMAP1) += omap1_bl.o
+obj-$(CONFIG_BACKLIGHT_OMAP) += omap_bl.o
obj-$(CONFIG_BACKLIGHT_PROGEAR) += progear_bl.o
obj-$(CONFIG_BACKLIGHT_CARILLO_RANCH) += cr_bllcd.o
obj-$(CONFIG_BACKLIGHT_PWM) += pwm_bl.o
diff --git a/drivers/video/backlight/omap_bl.c b/drivers/video/backlight/omap_bl.c
new file mode 100644
index 0000000..eb9b5ba
--- /dev/null
+++ b/drivers/video/backlight/omap_bl.c
@@ -0,0 +1,218 @@
+/*
+ * drivers/video/backlight/omap_bl.c
+ *
+ * Backlight driver for OMAP based boards.
+ *
+ * Copyright (c) 2006 Andrzej Zaborowski <balrog@xxxxxxxxx>
+ *
+ * This package is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This package is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this package; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/fb.h>
+#include <linux/backlight.h>
+
+#include <mach/hardware.h>
+#include <mach/board.h>
+#include <mach/mux.h>
+
+#define OMAPBL_MAX_INTENSITY 0xff
+
+struct omap_backlight {
+ int powermode;
+ int current_intensity;
+
+ struct device *dev;
+ struct omap_backlight_config *pdata;
+};
+
+static void inline omapbl_send_intensity(int intensity)
+{
+ omap_writeb(intensity, OMAP_PWL_ENABLE);
+}
+
+static void inline omapbl_send_enable(int enable)
+{
+ omap_writeb(enable, OMAP_PWL_CLK_ENABLE);
+}
+
+static void omapbl_blank(struct omap_backlight *bl, int mode)
+{
+ if (bl->pdata->set_power)
+ bl->pdata->set_power(bl->dev, mode);
+
+ switch (mode) {
+ case FB_BLANK_NORMAL:
+ case FB_BLANK_VSYNC_SUSPEND:
+ case FB_BLANK_HSYNC_SUSPEND:
+ case FB_BLANK_POWERDOWN:
+ omapbl_send_intensity(0);
+ omapbl_send_enable(0);
+ break;
+
+ case FB_BLANK_UNBLANK:
+ omapbl_send_intensity(bl->current_intensity);
+ omapbl_send_enable(1);
+ break;
+ }
+}
+
+#ifdef CONFIG_PM
+static int omapbl_suspend(struct platform_device *pdev, pm_message_t state)
+{
+ struct backlight_device *dev = platform_get_drvdata(pdev);
+ struct omap_backlight *bl = dev_get_drvdata(&dev->dev);
+
+ omapbl_blank(bl, FB_BLANK_POWERDOWN);
+ return 0;
+}
+
+static int omapbl_resume(struct platform_device *pdev)
+{
+ struct backlight_device *dev = platform_get_drvdata(pdev);
+ struct omap_backlight *bl = dev_get_drvdata(&dev->dev);
+
+ omapbl_blank(bl, bl->powermode);
+ return 0;
+}
+#else
+#define omapbl_suspend NULL
+#define omapbl_resume NULL
+#endif
+
+static int omapbl_set_power(struct backlight_device *dev, int state)
+{
+ struct omap_backlight *bl = dev_get_drvdata(&dev->dev);
+
+ omapbl_blank(bl, state);
+ bl->powermode = state;
+
+ return 0;
+}
+
+static int omapbl_update_status(struct backlight_device *dev)
+{
+ struct omap_backlight *bl = dev_get_drvdata(&dev->dev);
+
+ if (bl->current_intensity != dev->props.brightness) {
+ if (dev->props.brightness < 0)
+ return -EPERM; /* Leave current_intensity untouched */
+
+ if (bl->powermode == FB_BLANK_UNBLANK)
+ omapbl_send_intensity(dev->props.brightness);
+ bl->current_intensity = dev->props.brightness;
+ }
+
+ if (dev->props.fb_blank != bl->powermode)
+ omapbl_set_power(dev, dev->props.fb_blank);
+
+ return 0;
+}
+
+
+static int omapbl_get_intensity(struct backlight_device *dev)
+{
+ struct omap_backlight *bl = dev_get_drvdata(&dev->dev);
+ return bl->current_intensity;
+}
+
+static struct backlight_ops omapbl_ops = {
+ .get_brightness = omapbl_get_intensity,
+ .update_status = omapbl_update_status,
+};
+
+
+static int omapbl_probe(struct platform_device *pdev)
+{
+ struct backlight_device *dev;
+ struct omap_backlight *bl;
+ struct omap_backlight_config *pdata = pdev->dev.platform_data;
+
+ if (!pdata)
+ return -ENXIO;
+
+ omapbl_ops.check_fb = pdata->check_fb;
+
+ bl = kzalloc(sizeof(struct omap_backlight), GFP_KERNEL);
+ if (unlikely(!bl))
+ return -ENOMEM;
+
+ dev = backlight_device_register("omap-bl", &pdev->dev,
+ bl, &omapbl_ops);
+ if (IS_ERR(dev)) {
+ kfree(bl);
+ return PTR_ERR(dev);
+ }
+
+ bl->powermode = FB_BLANK_POWERDOWN;
+ bl->current_intensity = 0;
+
+ bl->pdata = pdata;
+ bl->dev = &pdev->dev;
+
+ platform_set_drvdata(pdev, dev);
+
+ omap_cfg_reg(PWL); /* Conflicts with UART3 */
+
+ dev->props.fb_blank = FB_BLANK_UNBLANK;
+ dev->props.max_brightness = OMAPBL_MAX_INTENSITY;
+ dev->props.brightness = pdata->default_intensity;
+ omapbl_update_status(dev);
+
+ printk(KERN_INFO "OMAP LCD backlight initialised\n");
+
+ return 0;
+}
+
+static int omapbl_remove(struct platform_device *pdev)
+{
+ struct backlight_device *dev = platform_get_drvdata(pdev);
+ struct omap_backlight *bl = dev_get_drvdata(&dev->dev);
+
+ backlight_device_unregister(dev);
+ kfree(bl);
+
+ return 0;
+}
+
+static struct platform_driver omapbl_driver = {
+ .probe = omapbl_probe,
+ .remove = omapbl_remove,
+ .suspend = omapbl_suspend,
+ .resume = omapbl_resume,
+ .driver = {
+ .name = "omap-bl",
+ },
+};
+
+static int __init omapbl_init(void)
+{
+ return platform_driver_register(&omapbl_driver);
+}
+
+static void __exit omapbl_exit(void)
+{
+ platform_driver_unregister(&omapbl_driver);
+}
+
+module_init(omapbl_init);
+module_exit(omapbl_exit);
+
+MODULE_AUTHOR("Andrzej Zaborowski <balrog@xxxxxxxxx>");
+MODULE_DESCRIPTION("OMAP LCD Backlight driver");
+MODULE_LICENSE("GPL");
--
1.6.0.1.141.g445ca
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