Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=ec072b0f8bc8e885a8572418ad4b6802c027ca01
Commit:     ec072b0f8bc8e885a8572418ad4b6802c027ca01
Parent:     515524537999c1f107a0a7c7f74c034979c2c86d
Author:     Andrzej Zaborowski <[EMAIL PROTECTED]>
AuthorDate: Sun Jan 13 23:15:43 2008 +0000
Committer:  Richard Purdie <[EMAIL PROTECTED]>
CommitDate: Thu Feb 7 09:31:52 2008 +0000

    backlight: Add OMAP1 PWL backlight driver
    
    This adds the OMAP1 PWL-based LCD backlight driver.  It's been in the OMAP
    tree for some time.  Note that OMAP2 can do similar things with the generic
    timers which have PWM outputs.  Such timers are more generic than the PWL
    found on OMAP1 chips, but have a different EMI profile because they aren't
    driven by a pseudorandom number generator.
    
    [EMAIL PROTECTED]: cleanups]
    Signed-off-by: David Brownell <[EMAIL PROTECTED]>
    Signed-off-by: Andrzej Zaborowski <[EMAIL PROTECTED]>
    Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
    Signed-off-by: Richard Purdie <[EMAIL PROTECTED]>
---
 drivers/video/backlight/Kconfig    |    9 ++
 drivers/video/backlight/Makefile   |    1 +
 drivers/video/backlight/omap1_bl.c |  210 ++++++++++++++++++++++++++++++++++++
 3 files changed, 220 insertions(+), 0 deletions(-)

diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
index 924e255..dcd8073 100644
--- a/drivers/video/backlight/Kconfig
+++ b/drivers/video/backlight/Kconfig
@@ -80,6 +80,15 @@ config BACKLIGHT_LOCOMO
          If you have a Sharp Zaurus SL-5500 (Collie) or SL-5600 (Poodle) say y 
to
          enable the LCD/backlight driver.
 
+config BACKLIGHT_OMAP1
+       tristate "OMAP1 PWL-based LCD Backlight"
+       depends on BACKLIGHT_CLASS_DEVICE && ARCH_OMAP1
+       default y
+       help
+         This driver controls the LCD backlight level and power for
+         the PWL module of OMAP1 processors.  Say Y if your board
+         uses this hardware.
+
 config BACKLIGHT_HP680
        tristate "HP Jornada 680 Backlight Driver"
        depends on BACKLIGHT_CLASS_DEVICE && SH_HP6XX
diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
index 965a78b..33f6c7c 100644
--- a/drivers/video/backlight/Makefile
+++ b/drivers/video/backlight/Makefile
@@ -7,5 +7,6 @@ obj-$(CONFIG_BACKLIGHT_CLASS_DEVICE) += backlight.o
 obj-$(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_PROGEAR) += progear_bl.o
 obj-$(CONFIG_BACKLIGHT_CARILLO_RANCH) += cr_bllcd.o
diff --git a/drivers/video/backlight/omap1_bl.c 
b/drivers/video/backlight/omap1_bl.c
new file mode 100644
index 0000000..891875d
--- /dev/null
+++ b/drivers/video/backlight/omap1_bl.c
@@ -0,0 +1,210 @@
+/*
+ * Backlight driver for OMAP based boards.
+ *
+ * Copyright (c) 2006 Andrzej Zaborowski  <[EMAIL PROTECTED]>
+ *
+ * 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 <asm/arch/hardware.h>
+#include <asm/arch/board.h>
+#include <asm/arch/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 (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 <[EMAIL PROTECTED]>");
+MODULE_DESCRIPTION("OMAP LCD Backlight driver");
+MODULE_LICENSE("GPL");
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