Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / arm / plat-samsung / dev-backlight.c

diff --git a/kernel/arch/arm/plat-samsung/dev-backlight.c b/kernel/arch/arm/plat-samsung/dev-backlight.c
new file mode 100644 (file)
index 0000000..2157c5b
--- /dev/null
+++ b/kernel/arch/arm/plat-samsung/dev-backlight.c
@@ -0,0 +1,152 @@
+/* linux/arch/arm/plat-samsung/dev-backlight.c
+ *
+ * Copyright (c) 2011 Samsung Electronics Co., Ltd.
+ *              http://www.samsung.com
+ *
+ * Common infrastructure for PWM Backlight for Samsung boards
+ *
+ * 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.
+ */
+
+#include <linux/gpio.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/io.h>
+#include <linux/pwm_backlight.h>
+
+#include <plat/devs.h>
+#include <plat/gpio-cfg.h>
+#include <plat/backlight.h>
+
+struct samsung_bl_drvdata {
+       struct platform_pwm_backlight_data plat_data;
+       struct samsung_bl_gpio_info *gpio_info;
+};
+
+static int samsung_bl_init(struct device *dev)
+{
+       int ret = 0;
+       struct platform_pwm_backlight_data *pdata = dev->platform_data;
+       struct samsung_bl_drvdata *drvdata = container_of(pdata,
+                                       struct samsung_bl_drvdata, plat_data);
+       struct samsung_bl_gpio_info *bl_gpio_info = drvdata->gpio_info;
+
+       ret = gpio_request(bl_gpio_info->no, "Backlight");
+       if (ret) {
+               printk(KERN_ERR "failed to request GPIO for LCD Backlight\n");
+               return ret;
+       }
+
+       /* Configure GPIO pin with specific GPIO function for PWM timer */
+       s3c_gpio_cfgpin(bl_gpio_info->no, bl_gpio_info->func);
+
+       return 0;
+}
+
+static void samsung_bl_exit(struct device *dev)
+{
+       struct platform_pwm_backlight_data *pdata = dev->platform_data;
+       struct samsung_bl_drvdata *drvdata = container_of(pdata,
+                                       struct samsung_bl_drvdata, plat_data);
+       struct samsung_bl_gpio_info *bl_gpio_info = drvdata->gpio_info;
+
+       s3c_gpio_cfgpin(bl_gpio_info->no, S3C_GPIO_OUTPUT);
+       gpio_free(bl_gpio_info->no);
+}
+
+/* Initialize few important fields of platform_pwm_backlight_data
+ * structure with default values. These fields can be overridden by
+ * board-specific values sent from machine file.
+ * For ease of operation, these fields are initialized with values
+ * used by most samsung boards.
+ * Users has the option of sending info about other parameters
+ * for their specific boards
+ */
+
+static struct samsung_bl_drvdata samsung_dfl_bl_data __initdata = {
+       .plat_data = {
+               .max_brightness = 255,
+               .dft_brightness = 255,
+               .pwm_period_ns  = 78770,
+               .enable_gpio    = -1,
+               .init           = samsung_bl_init,
+               .exit           = samsung_bl_exit,
+       },
+};
+
+static struct platform_device samsung_dfl_bl_device __initdata = {
+       .name           = "pwm-backlight",
+};
+
+/* samsung_bl_set - Set board specific data (if any) provided by user for
+ * PWM Backlight control and register specific PWM and backlight device.
+ * @gpio_info: structure containing GPIO info for PWM timer
+ * @bl_data:   structure containing Backlight control data
+ */
+void __init samsung_bl_set(struct samsung_bl_gpio_info *gpio_info,
+       struct platform_pwm_backlight_data *bl_data)
+{
+       int ret = 0;
+       struct platform_device *samsung_bl_device;
+       struct samsung_bl_drvdata *samsung_bl_drvdata;
+       struct platform_pwm_backlight_data *samsung_bl_data;
+
+       samsung_bl_device = kmemdup(&samsung_dfl_bl_device,
+                       sizeof(struct platform_device), GFP_KERNEL);
+       if (!samsung_bl_device) {
+               printk(KERN_ERR "%s: no memory for platform dev\n", __func__);
+               return;
+       }
+
+       samsung_bl_drvdata = kmemdup(&samsung_dfl_bl_data,
+                               sizeof(samsung_dfl_bl_data), GFP_KERNEL);
+       if (!samsung_bl_drvdata) {
+               printk(KERN_ERR "%s: no memory for platform dev\n", __func__);
+               goto err_data;
+       }
+       samsung_bl_device->dev.platform_data = &samsung_bl_drvdata->plat_data;
+       samsung_bl_drvdata->gpio_info = gpio_info;
+       samsung_bl_data = &samsung_bl_drvdata->plat_data;
+
+       /* Copy board specific data provided by user */
+       samsung_bl_data->pwm_id = bl_data->pwm_id;
+       samsung_bl_device->dev.parent = &samsung_device_pwm.dev;
+
+       if (bl_data->max_brightness)
+               samsung_bl_data->max_brightness = bl_data->max_brightness;
+       if (bl_data->dft_brightness)
+               samsung_bl_data->dft_brightness = bl_data->dft_brightness;
+       if (bl_data->lth_brightness)
+               samsung_bl_data->lth_brightness = bl_data->lth_brightness;
+       if (bl_data->pwm_period_ns)
+               samsung_bl_data->pwm_period_ns = bl_data->pwm_period_ns;
+       if (bl_data->enable_gpio >= 0)
+               samsung_bl_data->enable_gpio = bl_data->enable_gpio;
+       if (bl_data->init)
+               samsung_bl_data->init = bl_data->init;
+       if (bl_data->notify)
+               samsung_bl_data->notify = bl_data->notify;
+       if (bl_data->notify_after)
+               samsung_bl_data->notify_after = bl_data->notify_after;
+       if (bl_data->exit)
+               samsung_bl_data->exit = bl_data->exit;
+       if (bl_data->check_fb)
+               samsung_bl_data->check_fb = bl_data->check_fb;
+
+       /* Register the Backlight dev */
+       ret = platform_device_register(samsung_bl_device);
+       if (ret) {
+               printk(KERN_ERR "failed to register backlight device: %d\n", ret);
+               goto err_plat_reg2;
+       }
+
+       return;
+
+err_plat_reg2:
+       kfree(samsung_bl_data);
+err_data:
+       kfree(samsung_bl_device);
+       return;
+}