This patch implements the backlight driver for OMAP3EVM.
The mechanism for backlight control is reused from the
existing controls in lcd_omap3evm.c.
Signed-off-by: Sanjeev Premi <premi@xxxxxx>
---
drivers/video/backlight/Kconfig | 7 +
drivers/video/backlight/Makefile | 1 +
drivers/video/backlight/omap3evm_bl.c | 252 +++++++++++++++++++++++++++++++++
drivers/video/omap/Kconfig | 1 +
drivers/video/omap/lcd_omap3evm.c | 25 ----
5 files changed, 261 insertions(+), 25 deletions(-)
create mode 100644 drivers/video/backlight/omap3evm_bl.c
diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
index 4a4dd9a..2efa5d0 100644
--- a/drivers/video/backlight/Kconfig
+++ b/drivers/video/backlight/Kconfig
@@ -152,6 +152,13 @@ config BACKLIGHT_OMAP1
the PWL module of OMAP1 processors. Say Y if your board
uses this hardware.
+config BACKLIGHT_OMAP3EVM
+ tristate "OMAP3EVM LCD Backlight"
+ depends on BACKLIGHT_CLASS_DEVICE && MACH_OMAP3EVM
+ default y
+ help
+ This driver controls the LCD backlight for OMAP3EVM.
+
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 103427d..0150953 100644
--- a/drivers/video/backlight/Makefile
+++ b/drivers/video/backlight/Makefile
@@ -15,6 +15,7 @@ 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-$(CONFIG_BACKLIGHT_OMAP3EVM) += omap3evm_bl.o
obj-$(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/omap3evm_bl.c b/drivers/video/backlight/omap3evm_bl.c
new file mode 100644
index 0000000..a6dd3a1
--- /dev/null
+++ b/drivers/video/backlight/omap3evm_bl.c
@@ -0,0 +1,252 @@
+/*
+ * drivers/video/backlight/omap3evm_bl.c
+ *
+ * Backlight driver for OMAP3EVM
+ *
+ * Copyright (c) 2009, Texas Instruments Incorporated.
+ *
+ * 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 program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
+ * whether express or implied; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+
+#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 <linux/i2c/twl4030.h>
+
+#include <mach/omapfb.h>
+
+/**
+ * Name of the driver
+ */
+#define OMAPBL_DRVNAME "omap-backlight"
+
+/**
+ * Name of the device
+ */
+#define OMAPBL_DEVNAME "omap-backlight"
+
+/**
+ * Minimum intensity supported by the panel
+ */
+#define OMAPBL_MIN_INTENSITY 0
+/**
+ * Maximum intensity supported by the panel
+ */
+#define OMAPBL_MAX_INTENSITY 100
+
+/**
+ * Default intensity after boot-up
+ */
+#define OMAPBL_DEF_INTENSITY 70
+
+/**
+ * Flag indicating the driver status - suspended / running
+ */
+#define OMAPBL_SUSPENDED 0x01
+
+/**
+ * Flag indicating low battery
+ */
+#define OMAPBL_BATTLOW 0x02
+
+#define TWL_PWMA_PWMAON 0x00
+#define TWL_PWMA_PWMAOFF 0x01
+
+/**
+ * Current backlight intensity
+ */
+static int panel_intensity;
+
+/**
+ * Backlight properties
+ */
+static struct backlight_properties omapbl_props;
+
+/**
+ * Generic backlight information
+ */
+static struct generic_bl_info *omapbl_info;
+
+/**
+ * Backlight device
+ */
+struct backlight_device *omapbl_device;
+
+/**
+ * Backlight flags
+ */
+static unsigned long omapbl_flags;
+
+static int omapbl_set_intensity(struct backlight_device *bd)
+{
+ int intensity = bd->props.brightness;
+ u8 c;
+
+ if (bd->props.power != FB_BLANK_UNBLANK)
+ intensity = 0;
+ if (bd->props.fb_blank != FB_BLANK_UNBLANK)
+ intensity = 0;
+ if (omapbl_flags & OMAPBL_SUSPENDED)
+ intensity = 0;
+ if (omapbl_flags & OMAPBL_BATTLOW)
+ intensity &= omapbl_info->limit_mask;
+
+ c = ((125 * (100 - intensity)) / 100) + 2;
+
+ twl4030_i2c_write_u8(TWL4030_MODULE_PWMA, c, TWL_PWMA_PWMAOFF);
+
+ panel_intensity = intensity;
+
+ return 0;
+}
+
+static int omapbl_get_intensity(struct backlight_device *bd)
+{
+ return panel_intensity;
+}
+
+/**
+ * omapbl_limit_intensity - Limit the backlight iuntensity
+ * @limit - Value 0 clears the limit. Else used as limit to be set.
+ *
+ * When the battery is low, this function is called to limit the backlight.
+ */
+void omapbl_limit_intensity(int limit)
+{
+ if (limit)
+ omapbl_flags |= OMAPBL_BATTLOW;
+ else
+ omapbl_flags &= ~OMAPBL_BATTLOW;
+
+ backlight_update_status(omapbl_device);
+}
+EXPORT_SYMBOL(omapbl_limit_intensity);
+
+static struct backlight_ops omapbl_ops = {
+ .get_brightness = omapbl_get_intensity,
+ .update_status = omapbl_set_intensity,
+};
+
+static int omapbl_probe(struct platform_device *pdev)
+{
+ omapbl_device = backlight_device_register (OMAPBL_DRVNAME,
+ &pdev->dev,
+ NULL,
+ &omapbl_ops);
+
+ if (IS_ERR (omapbl_device))
+ return PTR_ERR (omapbl_device);
+
+ platform_set_drvdata(pdev, omapbl_device);
+
+ omapbl_device->props.power = FB_BLANK_UNBLANK;
+ omapbl_device->props.max_brightness = OMAPBL_MAX_INTENSITY;
+ omapbl_device->props.brightness = OMAPBL_DEF_INTENSITY;
+
+ omapbl_set_intensity(omapbl_device);
+
+ printk(KERN_INFO "omap-backlight: driver initialized.\n");
+
+ return 0;
+}
+
+static int omapbl_remove(struct platform_device *pdev)
+{
+ struct backlight_device *bd = platform_get_drvdata(pdev);
+
+ omapbl_props.power = 0;
+ omapbl_props.brightness = 0;
+ backlight_update_status(bd);
+
+ backlight_device_unregister(bd);
+
+ printk(KERN_INFO "omap-backlight: driver unloaded.\n");
+
+ return 0;
+}
+
+#ifdef CONFIG_PM
+static int omapbl_suspend(struct platform_device *pdev, pm_message_t state)
+{
+ struct backlight_device *bd = platform_get_drvdata(pdev);
+
+ printk(KERN_INFO "omap-backlight: suspending...\n");
+
+ omapbl_flags |= OMAPBL_SUSPENDED;
+ backlight_update_status(bd);
+
+ return 0;
+}
+
+static int omapbl_resume(struct platform_device *pdev)
+{
+ struct backlight_device *bd = platform_get_drvdata(pdev);
+
+ printk(KERN_INFO "omap-backlight: resuming...\n");
+
+ omapbl_flags &= ~OMAPBL_SUSPENDED;
+ backlight_update_status(bd);
+
+ return 0;
+}
+#else
+#define omapbl_suspend NULL
+#define omapbl_resume NULL
+#endif
+
+static struct platform_driver omap_backlight_drv = {
+ .probe = omapbl_probe,
+ .remove = omapbl_remove,
+ .suspend = omapbl_suspend,
+ .resume = omapbl_resume,
+ .driver = {
+ .name = OMAPBL_DRVNAME,
+ },
+};
+
+static struct platform_device *omap_backlight_dev;
+
+static int __init omapbl_init(void)
+{
+ int ret = platform_driver_register(&omap_backlight_drv);
+
+ if (!ret) {
+ omap_backlight_dev = platform_device_alloc(OMAPBL_DEVNAME, -1);
+
+ if (!omap_backlight_dev)
+ return -ENOMEM;
+
+ ret = platform_device_add(omap_backlight_dev);
+
+ if (ret) {
+ platform_device_put(omap_backlight_dev);
+ platform_driver_unregister(&omap_backlight_drv);
+ }
+ }
+
+ return ret;
+}
+
+static void __exit omapbl_exit(void)
+{
+ platform_device_unregister(omap_backlight_dev);
+ platform_driver_unregister(&omap_backlight_drv);
+}
+
+module_init(omapbl_init);
+module_exit(omapbl_exit);
+
+MODULE_AUTHOR("Sanjeev Premi <premi@xxxxxx>");
+MODULE_DESCRIPTION("OMAP LCD Backlight driver");
+MODULE_LICENSE("GPLv2");
+
diff --git a/drivers/video/omap/Kconfig b/drivers/video/omap/Kconfig
index c355b59..41ae018 100644
--- a/drivers/video/omap/Kconfig
+++ b/drivers/video/omap/Kconfig
@@ -4,6 +4,7 @@ config FB_OMAP
select FB_CFB_FILLRECT
select FB_CFB_COPYAREA
select FB_CFB_IMAGEBLIT
+ select FB_BACKLIGHT
help
Frame buffer driver for OMAP based boards.
diff --git a/drivers/video/omap/lcd_omap3evm.c b/drivers/video/omap/lcd_omap3evm.c
index 1c3d814..079989f 100644
--- a/drivers/video/omap/lcd_omap3evm.c
+++ b/drivers/video/omap/lcd_omap3evm.c
@@ -94,28 +94,6 @@ static unsigned long omap3evm_panel_get_caps(struct lcd_panel *panel)
return 0;
}
-static int omap3evm_bklight_setlevel(struct lcd_panel *panel,
- unsigned int level)
-{
- u8 c;
- if ((level >= 0) && (level <= 100)) {
- c = (125 * (100 - level)) / 100 + 2;
- twl4030_i2c_write_u8(TWL4030_MODULE_PWMA, c, TWL_PWMA_PWMAOFF);
- bklight_level = level;
- }
- return 0;
-}
-
-static unsigned int omap3evm_bklight_getlevel(struct lcd_panel *panel)
-{
- return bklight_level;
-}
-
-static unsigned int omap3evm_bklight_getmaxlevel(struct lcd_panel *panel)
-{
- return 100;
-}
-
struct lcd_panel omap3evm_panel = {
.name = "omap3evm",
.config = OMAP_LCDC_PANEL_TFT | OMAP_LCDC_INV_VSYNC |
@@ -139,9 +117,6 @@ struct lcd_panel omap3evm_panel = {
.enable = omap3evm_panel_enable,
.disable = omap3evm_panel_disable,
.get_caps = omap3evm_panel_get_caps,
- .set_bklight_level = omap3evm_bklight_setlevel,
- .get_bklight_level = omap3evm_bklight_getlevel,
- .get_bklight_max = omap3evm_bklight_getmaxlevel,
};
static int omap3evm_panel_probe(struct platform_device *pdev)
--
1.5.6
--
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