--- /dev/null
+/*
+ * LCD Lowlevel Control Abstraction
+ *
+ * Copyright (C) 2003,2004 Hewlett-Packard Company
+ *
+ */
+
+#ifndef _LINUX_LCD_H
+#define _LINUX_LCD_H
+
+#include <linux/device.h>
+#include <linux/mutex.h>
+#include <linux/notifier.h>
+#include <linux/fb.h>
+
+/* Notes on locking:
+ *
+ * lcd_device->ops_lock is an internal backlight lock protecting the ops
+ * field and no code outside the core should need to touch it.
+ *
+ * Access to set_power() is serialised by the update_lock mutex since
+ * most drivers seem to need this and historically get it wrong.
+ *
+ * Most drivers don't need locking on their get_power() method.
+ * If yours does, you need to implement it in the driver. You can use the
+ * update_lock mutex if appropriate.
+ *
+ * Any other use of the locks below is probably wrong.
+ */
+
+struct lcd_device;
+struct fb_info;
+
+struct lcd_properties {
+ /* The maximum value for contrast (read-only) */
+ int max_contrast;
+};
+
+struct lcd_ops {
+ /* Get the LCD panel power status (0: full on, 1..3: controller
+ power on, flat panel power off, 4: full off), see FB_BLANK_XXX */
+ int (*get_power)(struct lcd_device *);
+ /*
+ * Enable or disable power to the LCD(0: on; 4: off, see FB_BLANK_XXX)
+ * and this callback would be called proir to fb driver's callback.
+ *
+ * P.S. note that if early_set_power is not NULL then early fb notifier
+ * would be registered.
+ */
+ int (*early_set_power)(struct lcd_device *, int power);
+ /* revert the effects of the early blank event. */
+ int (*r_early_set_power)(struct lcd_device *, int power);
+ /* Enable or disable power to the LCD (0: on; 4: off, see FB_BLANK_XXX) */
+ int (*set_power)(struct lcd_device *, int power);
+ /* Get the current contrast setting (0-max_contrast) */
+ int (*get_contrast)(struct lcd_device *);
+ /* Set LCD panel contrast */
+ int (*set_contrast)(struct lcd_device *, int contrast);
+ /* Set LCD panel mode (resolutions ...) */
+ int (*set_mode)(struct lcd_device *, struct fb_videomode *);
+ /* Check if given framebuffer device is the one LCD is bound to;
+ return 0 if not, !=0 if it is. If NULL, lcd always matches the fb. */
+ int (*check_fb)(struct lcd_device *, struct fb_info *);
+};
+
+struct lcd_device {
+ struct lcd_properties props;
+ /* This protects the 'ops' field. If 'ops' is NULL, the driver that
+ registered this device has been unloaded, and if class_get_devdata()
+ points to something in the body of that driver, it is also invalid. */
+ struct mutex ops_lock;
+ /* If this is NULL, the backing module is unloaded */
+ struct lcd_ops *ops;
+ /* Serialise access to set_power method */
+ struct mutex update_lock;
+ /* The framebuffer notifier block */
+ struct notifier_block fb_notif;
+
+ struct device dev;
+};
+
+struct lcd_platform_data {
+ /* reset lcd panel device. */
+ int (*reset)(struct lcd_device *ld);
+ /* on or off to lcd panel. if 'enable' is 0 then
+ lcd power off and 1, lcd power on. */
+ int (*power_on)(struct lcd_device *ld, int enable);
+
+ /* it indicates whether lcd panel was enabled
+ from bootloader or not. */
+ int lcd_enabled;
+ /* it means delay for stable time when it becomes low to high
+ or high to low that is dependent on whether reset gpio is
+ low active or high active. */
+ unsigned int reset_delay;
+ /* stable time needing to become lcd power on. */
+ unsigned int power_on_delay;
+ /* stable time needing to become lcd power off. */
+ unsigned int power_off_delay;
+
+ /* it could be used for any purpose. */
+ void *pdata;
+};
+
+static inline void lcd_set_power(struct lcd_device *ld, int power)
+{
+ mutex_lock(&ld->update_lock);
+ if (ld->ops && ld->ops->set_power)
+ ld->ops->set_power(ld, power);
+ mutex_unlock(&ld->update_lock);
+}
+
+extern struct lcd_device *lcd_device_register(const char *name,
+ struct device *parent, void *devdata, struct lcd_ops *ops);
+extern struct lcd_device *devm_lcd_device_register(struct device *dev,
+ const char *name, struct device *parent,
+ void *devdata, struct lcd_ops *ops);
+extern void lcd_device_unregister(struct lcd_device *ld);
+extern void devm_lcd_device_unregister(struct device *dev,
+ struct lcd_device *ld);
+
+#define to_lcd_device(obj) container_of(obj, struct lcd_device, dev)
+
+static inline void * lcd_get_data(struct lcd_device *ld_dev)
+{
+ return dev_get_drvdata(&ld_dev->dev);
+}
+
+
+#endif
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