This driver provides support for the CGEB backlight found on some
Congatec x86 modules.
Signed-off-by: Christian Gmeiner <christian.gmeiner@xxxxxxxxx>
---
drivers/video/backlight/Kconfig | 7 ++
drivers/video/backlight/Makefile | 1 +
drivers/video/backlight/congatec-cgeb_bl.c | 125 +++++++++++++++++++++++++++++
3 files changed, 133 insertions(+)
create mode 100644 drivers/video/backlight/congatec-cgeb_bl.c
diff --git a/drivers/video/backlight/Kconfig b/drivers/video/backlight/Kconfig
index 2d9923a..35e4913 100644
--- a/drivers/video/backlight/Kconfig
+++ b/drivers/video/backlight/Kconfig
@@ -451,6 +451,13 @@ config BACKLIGHT_BD6107
help
If you have a Rohm BD6107 say Y to enable the backlight driver.
+config BACKLIGHT_CONGATEC_CGEB
+ tristate "Congatec CGEB Backlight driver"
+ depends on MFD_CONGATEC_CGEB
+ help
+ This driver provides support for the backlight accssable via
+ the Congatec CGEB interface found on Congatec boards.
+
endif # BACKLIGHT_CLASS_DEVICE
endif # BACKLIGHT_LCD_SUPPORT
diff --git a/drivers/video/backlight/Makefile b/drivers/video/backlight/Makefile
index d67073f..5654d6a 100644
--- a/drivers/video/backlight/Makefile
+++ b/drivers/video/backlight/Makefile
@@ -28,6 +28,7 @@ obj-$(CONFIG_BACKLIGHT_AS3711) += as3711_bl.o
obj-$(CONFIG_BACKLIGHT_BD6107) += bd6107.o
obj-$(CONFIG_BACKLIGHT_CARILLO_RANCH) += cr_bllcd.o
obj-$(CONFIG_BACKLIGHT_CLASS_DEVICE) += backlight.o
+obj-$(CONFIG_BACKLIGHT_CONGATEC_CGEB) += congatec-cgeb_bl.o
obj-$(CONFIG_BACKLIGHT_DA903X) += da903x_bl.o
obj-$(CONFIG_BACKLIGHT_DA9052) += da9052_bl.o
obj-$(CONFIG_BACKLIGHT_EP93XX) += ep93xx_bl.o
diff --git a/drivers/video/backlight/congatec-cgeb_bl.c b/drivers/video/backlight/congatec-cgeb_bl.c
new file mode 100644
index 0000000..4e5f97e
--- /dev/null
+++ b/drivers/video/backlight/congatec-cgeb_bl.c
@@ -0,0 +1,125 @@
+/*
+ * CGEB backlight driver
+ *
+ * (c) 2012 Christian Gmeiner <christian.gmeiner@xxxxxxxxx>
+ *
+ * This program 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; version 2 of the License.
+ *
+ * This program 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.
+ */
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/backlight.h>
+#include <linux/mfd/congatec-cgeb.h>
+
+struct cgeb_backlight_data {
+ struct cgeb_board_data *board;
+ int unit;
+};
+
+static int cgeb_backlight_update_status(struct backlight_device *bl)
+{
+ struct cgeb_backlight_data *data = bl_get_data(bl);
+ struct cgeb_function_parameters fps;
+ int brightness = bl->props.brightness;
+ int err;
+
+ memset(&fps, 0, sizeof(fps));
+
+ fps.unit = data->unit;
+ fps.pars[0] = brightness;
+
+ err = cgeb_call(data->board, &fps, CgebVgaSetBacklight);
+ return err;
+}
+
+static int cgeb_backlight_get_brightness(struct backlight_device *bl)
+{
+ struct cgeb_backlight_data *data = bl_get_data(bl);
+ unsigned long brightness;
+
+ cgeb_call_simple(data->board, CgebVgaGetBacklight, 0, NULL, &brightness);
+
+ return brightness;
+}
+
+static const struct backlight_ops cgeb_backlight_ops = {
+ .update_status = cgeb_backlight_update_status,
+ .get_brightness = cgeb_backlight_get_brightness,
+};
+
+static int cgeb_backlight_probe(struct platform_device *pdev)
+{
+ struct backlight_device *bl;
+ struct backlight_properties props;
+ struct cgeb_backlight_data *data;
+ struct cgeb_pdata *pdata = pdev->dev.platform_data;
+ int ret;
+
+ data = devm_kzalloc(&pdev->dev, sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ data->unit = pdata->unit;
+ data->board = pdata->board;
+
+ props.max_brightness = 100;
+ props.brightness = 100;
+ props.type = BACKLIGHT_RAW;
+
+ bl = backlight_device_register(dev_name(&pdev->dev), &pdev->dev, data,
+ &cgeb_backlight_ops, &props);
+ if (IS_ERR(bl)) {
+ dev_err(&pdev->dev, "failed to register backlight\n");
+ ret = PTR_ERR(bl);
+ goto error_backlight_device_register;
+ }
+
+ platform_set_drvdata(pdev, bl);
+
+ dev_info(&pdev->dev, "registered\n");
+ return 0;
+
+error_backlight_device_register:
+ kfree(data);
+ return ret;
+};
+
+static int cgeb_backlight_remove(struct platform_device *pdev)
+{
+ struct backlight_device *bl = platform_get_drvdata(pdev);
+ struct cgeb_backlight_data *data = bl_get_data(bl);
+ struct cgeb_function_parameters fps;
+
+ backlight_device_unregister(bl);
+
+ /* on module unload set brightness to 100% */
+ memset(&fps, 0, sizeof(fps));
+ fps.unit = data->unit;
+ fps.pars[0] = 100;
+ cgeb_call(data->board, &fps, CgebVgaSetBacklight);
+
+ kfree(data);
+ return 0;
+}
+
+static struct platform_driver cgeb_backlight_driver = {
+ .probe = cgeb_backlight_probe,
+ .remove = __exit_p(cgeb_backlight_remove),
+ .driver = {
+ .name = "cgeb-backlight",
+ .owner = THIS_MODULE,
+ },
+};
+
+module_platform_driver(cgeb_backlight_driver);
+
+MODULE_AUTHOR("Christian Gmeiner <christian.gmeiner@xxxxxxxxx>");
+MODULE_DESCRIPTION("cgeb backlight driver");
+MODULE_LICENSE("GPL");
--
2.4.2
--
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