This driver provides support for the CGEB backlight found on some Congatec x86 modules.
Signed-off-by: Christian Gmeiner <[email protected]> --- 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 <[email protected]> + * + * 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 <[email protected]>"); +MODULE_DESCRIPTION("cgeb backlight driver"); +MODULE_LICENSE("GPL"); -- 2.4.2 -- To unsubscribe from this list: send the line "unsubscribe linux-watchdog" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
