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SubjectBacklight and LCD module patches [2]

This patch adds lcd and backlight driver classes so that the
lowlevel lcd and backlight power controls can be separated from
framebuffer drivers.

Signed-off-by: Jamey Hicks <jamey.hicks@hp.com>
Signed-off-by: Andrew Zabolotny <zap@homelink.ru>

--- linux-2.6.7-rc3/include/linux/lcd.h 1970-01-01 03:00:00.000000000 +0300
+++ linux/include/linux/lcd.h 2004-06-08 01:59:42.000000000 +0400
@@ -0,0 +1,58 @@
+/*
+ * LCD Lowlevel Control Abstraction
+ *
+ * Copyright (C) 2003,2004 Hewlett-Packard Company
+ *
+ */
+
+#ifndef _LINUX_LCD_H
+#define _LINUX_LCD_H
+
+#include <linux/device.h>
+
+struct lcd_device;
+
+/* This structure defines all the properties of a LCD flat panel. */
+struct lcd_properties {
+ /* Owner module */
+ struct module *owner;
+ /* Get the LCD panel power status (0: full on, 1..3: controller
+ power on, flat panel power off, 4: full off) */
+ int (*get_power) (struct lcd_device *);
+ /* Enable or disable power to the LCD (0: on; 4: off) */
+ int (*set_power) (struct lcd_device *, int power);
+ /* The maximum value for contrast (read-only) */
+ int max_contrast;
+ /* 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);
+};
+
+struct lcd_device {
+ /* This protects the 'props' field. If 'props' 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 semaphore sem;
+ /* If this is NULL, the backing module is unloaded */
+ struct lcd_properties *props;
+ /* The class device structure */
+ struct class_device class_dev;
+};
+
+extern int lcd_device_register(const char *name, void *devdata,
+ struct lcd_properties *lp,
+ struct lcd_device **alloc_ld);
+extern void lcd_device_unregister(struct lcd_device *ld);
+
+extern struct lcd_device *lcd_device_find(const char *name);
+extern struct lcd_device *lcd_device_get(struct lcd_device *ld);
+extern void lcd_device_put(struct lcd_device *ld);
+
+#define to_lcd_device(obj) container_of(obj, struct lcd_device, class_dev)
+
+/* The registered clients of this notifier chain will be called every time
+ a new lcd class_device is registered */
+extern struct notifier_block *lcd_device_chain;
+
+#endif
--- linux-2.6.7-rc3/include/linux/backlight.h 1970-01-01 03:00:00.000000000 +0300
+++ linux/include/linux/backlight.h 2004-06-08 01:46:09.000000000 +0400
@@ -0,0 +1,58 @@
+/*
+ * Backlight Lowlevel Control Abstraction
+ *
+ * Copyright (C) 2003,2004 Hewlett-Packard Company
+ *
+ */
+
+#ifndef _LINUX_BACKLIGHT_H
+#define _LINUX_BACKLIGHT_H
+
+#include <linux/device.h>
+
+struct backlight_device;
+
+/* This structure defines all the properties of a backlight
+ (usually attached to a LCD). */
+struct backlight_properties {
+ /* Owner module */
+ struct module *owner;
+ /* Get the power status (0: on, 1..3: power saving modes; 4: off) */
+ int (*get_power) (struct backlight_device *);
+ /* Enable or disable power to the LCD (0: on; 4: off) */
+ int (*set_power) (struct backlight_device *, int power);
+ /* Maximal value for brightness (read-only) */
+ int max_brightness;
+ /* Get current backlight brightness */
+ int (*get_brightness) (struct backlight_device *);
+ /* Set backlight brightness (0..max_brightness) */
+ int (*set_brightness) (struct backlight_device *, int brightness);
+};
+
+struct backlight_device {
+ /* This protects the 'props' field. If 'props' 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 semaphore sem;
+ /* If this is NULL, the backing module is unloaded */
+ struct backlight_properties *props;
+ /* The class device structure */
+ struct class_device class_dev;
+};
+
+extern int backlight_device_register(const char *name, void *devdata,
+ struct backlight_properties *bp,
+ struct backlight_device **alloc_bd);
+extern void backlight_device_unregister(struct backlight_device *bd);
+
+extern struct backlight_device *backlight_device_find(const char *name);
+extern struct backlight_device *backlight_device_get(struct backlight_device *bd);
+extern void backlight_device_put(struct backlight_device *bd);
+
+#define to_backlight_device(obj) container_of(obj, struct backlight_device, class_dev)
+
+/* The registered clients of this notifier chain will be called every time
+ a new backlight class_device is registered */
+extern struct notifier_block *backlight_device_chain;
+
+#endif
--- linux-2.6.7-rc3/drivers/video/lcd.c 1970-01-01 03:00:00.000000000 +0300
+++ linux/drivers/video/lcd.c 2004-06-08 02:15:11.000000000 +0400
@@ -0,0 +1,306 @@
+/*
+ * LCD Lowlevel Control Abstraction
+ *
+ * Copyright (C) 2003,2004 Hewlett-Packard Company
+ *
+ */
+
+#include <linux/version.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/lcd.h>
+#include <linux/notifier.h>
+#include <linux/ctype.h>
+#include <asm/bug.h>
+
+struct notifier_block *lcd_device_chain;
+EXPORT_SYMBOL (lcd_device_chain);
+
+static ssize_t lcd_show_power(struct class_device *cdev, char *buf)
+{
+ int rc;
+ struct lcd_device *ld = to_lcd_device(cdev);
+
+ down (&ld->sem);
+ if (likely (ld->props && ld->props->get_power))
+ rc = sprintf (buf, "%d\n", ld->props->get_power (ld));
+ else
+ rc = -ENXIO;
+ up (&ld->sem);
+
+ return rc;
+}
+
+static ssize_t lcd_store_power(struct class_device *cdev, const char *buf, size_t count)
+{
+ int rc, power;
+ char *endp;
+ struct lcd_device *ld = to_lcd_device(cdev);
+
+ power = simple_strtoul(buf, &endp, 0);
+ if (*endp && !isspace (*endp))
+ return -EINVAL;
+
+ down (&ld->sem);
+ if (likely (ld->props && ld->props->set_power)) {
+ pr_debug("lcd: set power to %d\n", power);
+ ld->props->set_power(ld, power);
+ rc = count;
+ } else
+ rc = -ENXIO;
+ up (&ld->sem);
+
+ return rc;
+}
+
+static ssize_t lcd_show_contrast(struct class_device *cdev, char *buf)
+{
+ int rc;
+ struct lcd_device *ld = to_lcd_device(cdev);
+
+ down (&ld->sem);
+ if (likely (ld->props && ld->props->get_contrast))
+ rc = sprintf (buf, "%d\n", ld->props->get_contrast(ld));
+ else
+ rc = -ENXIO;
+ up (&ld->sem);
+
+ return rc;
+}
+
+static ssize_t lcd_store_contrast(struct class_device *cdev, const char *buf, size_t count)
+{
+ int rc, contrast;
+ char *endp;
+ struct lcd_device *ld = to_lcd_device(cdev);
+
+ contrast = simple_strtoul(buf, &endp, 0);
+ if (*endp && !isspace (*endp))
+ return -EINVAL;
+
+ down (&ld->sem);
+ if (likely (ld->props && ld->props->set_contrast)) {
+ pr_debug("lcd: set contrast to %d\n", contrast);
+ ld->props->set_contrast(ld, contrast);
+ rc = count;
+ } else
+ rc = -ENXIO;
+ up (&ld->sem);
+
+ return rc;
+}
+
+static ssize_t lcd_show_max_contrast(struct class_device *cdev, char *buf)
+{
+ int rc;
+ struct lcd_device *ld = to_lcd_device(cdev);
+
+ down (&ld->sem);
+ if (likely (ld->props))
+ rc = sprintf (buf, "%d\n", ld->props->max_contrast);
+ else
+ rc = -ENXIO;
+ up (&ld->sem);
+
+ return rc;
+}
+
+static void lcd_class_release(struct class_device *dev)
+{
+ struct lcd_device *ld = to_lcd_device (dev);
+ kfree (ld);
+}
+
+struct class lcd_class = {
+ .name = "lcd",
+ .release = lcd_class_release,
+};
+
+#define DECLARE_ATTR(_name,_mode,_show,_store) \
+ { \
+ .attr = { .name = __stringify(_name), .mode = _mode, .owner = THIS_MODULE }, \
+ .show = _show, \
+ .store = _store, \
+ }
+
+static struct class_device_attribute lcd_class_device_attributes[] = {
+ DECLARE_ATTR (power, 0644, lcd_show_power, lcd_store_power),
+ DECLARE_ATTR (contrast, 0644, lcd_show_contrast, lcd_store_contrast),
+ DECLARE_ATTR (max_contrast, 0444, lcd_show_max_contrast, NULL),
+};
+
+/**
+ * lcd_device_register - register a new object of lcd_device class.
+ * @name: the name of the new object (must be the same as the name of the
+ * respective framebuffer device).
+ * @devdata: an optional pointer to be stored in the class_device. The
+ * methods may retrieve it by using class_get_devdata (ld->class_dev).
+ * @lp: the lcd properties structure.
+ * @alloc_ld: (returned) the newly allocated device. Must be used when
+ * deregistering the device. Not relevant if the procedure does not
+ * return 0 (success).
+ *
+ * Creates a new lcd class_device and copies data from the received ld
+ * structure into the new object. Returns after registering the new object.
+ */
+int lcd_device_register (const char *name, void *devdata,
+ struct lcd_properties *lp,
+ struct lcd_device **alloc_ld)
+{
+ int i, rc;
+ struct lcd_device *new_ld;
+
+ pr_debug("lcd_device_register: name=%s\n", name);
+
+ new_ld = kmalloc (sizeof (struct lcd_device), GFP_KERNEL);
+ if (unlikely (!new_ld))
+ return -ENOMEM;
+
+ init_MUTEX (&new_ld->sem);
+ new_ld->props = lp;
+ memset (&new_ld->class_dev, 0, sizeof (new_ld->class_dev));
+ new_ld->class_dev.class = &lcd_class;
+ strlcpy (new_ld->class_dev.class_id, name, KOBJ_NAME_LEN);
+ class_set_devdata (&new_ld->class_dev, devdata);
+
+ rc = class_device_register (&new_ld->class_dev);
+ if (unlikely (rc)) {
+ kfree (new_ld);
+ return rc;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(lcd_class_device_attributes); i++) {
+ rc = class_device_create_file(&new_ld->class_dev,
+ &lcd_class_device_attributes[i]);
+ if (unlikely (rc)) {
+ while (--i >= 0)
+ class_device_remove_file(&new_ld->class_dev,
+ &lcd_class_device_attributes[i]);
+ class_device_unregister(&new_ld->class_dev);
+ /* No need to kfree(new_ld) since release() method was called */
+ return rc;
+ }
+ }
+
+ *alloc_ld = new_ld;
+ notifier_call_chain (&lcd_device_chain, 0, new_ld);
+
+ return 0;
+}
+EXPORT_SYMBOL(lcd_device_register);
+
+/**
+ * lcd_device_unregister - unregisters a object of lcd_device class.
+ * @ld: the lcd device object to be unregistered and freed.
+ *
+ * Unregisters a previously registered via lcd_device_register object.
+ */
+void lcd_device_unregister(struct lcd_device *ld)
+{
+ int i;
+
+ if (!ld)
+ return;
+
+ pr_debug("lcd_device_unregister: name=%s\n", ld->class_dev.class_id);
+
+ for (i = 0; i < ARRAY_SIZE (lcd_class_device_attributes); i++)
+ class_device_remove_file (&ld->class_dev,
+ &lcd_class_device_attributes[i]);
+
+ down (&ld->sem);
+ ld->props = NULL;
+ up (&ld->sem);
+
+ class_device_unregister(&ld->class_dev);
+}
+EXPORT_SYMBOL(lcd_device_unregister);
+
+/**
+ * lcd_device_find - find a LCD device by name.
+ * @name: the name of the LCD object to find.
+ *
+ * The reference counter of the returned object as well as on the module
+ * that implements the backlight functions are incremented.
+ */
+struct lcd_device *lcd_device_find(const char *name)
+{
+ struct lcd_device *ld;
+ struct class_device *class_dev =
+ class_device_find (&lcd_class, name);
+
+ if (unlikely (!class_dev))
+ return NULL;
+
+ ld = lcd_device_get (to_lcd_device (class_dev));
+ class_device_put (class_dev);
+ return ld;
+}
+EXPORT_SYMBOL(lcd_device_find);
+
+/**
+ * lcd_device_get - increment reference counter of a LCD device
+ * and on the module that implements the LCD device methods.
+ * @ld: the LCD device object.
+ *
+ * Increments the reference counter on both the LCD device and on the
+ * module that implements this LCD device.
+ */
+struct lcd_device *lcd_device_get(struct lcd_device *ld)
+{
+ struct class_device *class_dev = class_device_get (&ld->class_dev);
+
+ if (likely (class_dev)) {
+ down (&ld->sem);
+ if (likely (ld->props && try_module_get (ld->props->owner))) {
+ up (&ld->sem);
+ return ld;
+ }
+ up (&ld->sem);
+
+ class_device_put(class_dev);
+ }
+ return NULL;
+}
+EXPORT_SYMBOL(lcd_device_get);
+
+/**
+ * lcd_device_put - decrement reference counter of a LCD device.
+ * @ld: the LCD device object.
+ *
+ * Decrements the reference counter on both the LCD device and on the
+ * module that implements this LCD device.
+ */
+void lcd_device_put(struct lcd_device *ld)
+{
+ if (ld) {
+ down (&ld->sem);
+ if (ld->props)
+ module_put(ld->props->owner);
+ up (&ld->sem);
+ class_device_put (&ld->class_dev);
+ }
+}
+EXPORT_SYMBOL(lcd_device_put);
+
+static void __exit lcd_class_exit(void)
+{
+ class_unregister(&lcd_class);
+}
+
+static int __init lcd_class_init(void)
+{
+ return class_register(&lcd_class);
+}
+
+/*
+ * if this is compiled into the kernel, we need to ensure that the
+ * class is registered before users of the class try to register lcd's
+ */
+postcore_initcall(lcd_class_init);
+module_exit(lcd_class_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Jamey Hicks <jamey.hicks@hp.com>, Andrew Zabolotny <zap@homelink.ru>");
+MODULE_DESCRIPTION("LCD Lowlevel Control Abstraction");
--- linux-2.6.7-rc3/drivers/video/backlight.c 1970-01-01 03:00:00.000000000 +0300
+++ linux/drivers/video/backlight.c 2004-06-08 02:15:45.000000000 +0400
@@ -0,0 +1,307 @@
+/*
+ * Backlight Lowlevel Control Abstraction
+ *
+ * Copyright (C) 2003,2004 Hewlett-Packard Company
+ *
+ */
+
+#include <linux/version.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/device.h>
+#include <linux/backlight.h>
+#include <linux/notifier.h>
+#include <linux/ctype.h>
+#include <asm/bug.h>
+
+struct notifier_block *backlight_device_chain;
+EXPORT_SYMBOL (backlight_device_chain);
+
+static ssize_t backlight_show_power (struct class_device *cdev, char *buf)
+{
+ int rc;
+ struct backlight_device *bd = to_backlight_device (cdev);
+
+ down (&bd->sem);
+ if (likely (bd->props && bd->props->get_power))
+ rc = sprintf (buf, "%d\n", bd->props->get_power (bd));
+ else
+ rc = -ENXIO;
+ up (&bd->sem);
+
+ return rc;
+}
+
+static ssize_t backlight_store_power(struct class_device *cdev, const char *buf, size_t count)
+{
+ int rc, power;
+ char *endp;
+ struct backlight_device *bd = to_backlight_device (cdev);
+
+ power = simple_strtoul (buf, &endp, 0);
+ if (*endp && !isspace (*endp))
+ return -EINVAL;
+
+ down (&bd->sem);
+ if (likely (bd->props && bd->props->set_power)) {
+ pr_debug("backlight: set power to %d\n", power);
+ bd->props->set_power(bd, power);
+ rc = count;
+ } else
+ rc = -ENXIO;
+ up (&bd->sem);
+
+ return rc;
+}
+
+static ssize_t backlight_show_brightness(struct class_device *cdev, char *buf)
+{
+ int rc;
+ struct backlight_device *bd = to_backlight_device (cdev);
+
+ down (&bd->sem);
+ if (likely (bd->props && bd->props->get_brightness))
+ rc = sprintf (buf, "%d\n", bd->props->get_brightness (bd));
+ else
+ rc = -ENXIO;
+ up (&bd->sem);
+
+ return rc;
+}
+
+static ssize_t backlight_store_brightness(struct class_device *cdev, const char *buf, size_t count)
+{
+ int rc, brightness;
+ char *endp;
+ struct backlight_device *bd = to_backlight_device (cdev);
+
+ brightness = simple_strtoul (buf, &endp, 0);
+ if (*endp && !isspace (*endp))
+ return -EINVAL;
+
+ down (&bd->sem);
+ if (likely (bd->props && bd->props->set_brightness)) {
+ pr_debug("backlight: set brightness to %d\n", brightness);
+ bd->props->set_brightness(bd, brightness);
+ rc = count;
+ } else
+ rc = -ENXIO;
+ up (&bd->sem);
+
+ return rc;
+}
+
+static ssize_t backlight_show_max_brightness(struct class_device *cdev, char *buf)
+{
+ int rc;
+ struct backlight_device *bd = to_backlight_device (cdev);
+
+ down (&bd->sem);
+ if (likely (bd->props))
+ rc = sprintf(buf, "%d\n", bd->props->max_brightness);
+ else
+ rc = -ENXIO;
+ up (&bd->sem);
+
+ return rc;
+}
+
+static void backlight_class_release(struct class_device *dev)
+{
+ struct backlight_device *bd = to_backlight_device (dev);
+ kfree (bd);
+}
+
+struct class backlight_class = {
+ .name = "backlight",
+ .release = backlight_class_release,
+};
+
+#define DECLARE_ATTR(_name,_mode,_show,_store) \
+ { \
+ .attr = { .name = __stringify(_name), .mode = _mode, .owner = THIS_MODULE }, \
+ .show = _show, \
+ .store = _store, \
+ }
+
+static struct class_device_attribute bl_class_device_attributes[] = {
+ DECLARE_ATTR (power, 0644, backlight_show_power, backlight_store_power),
+ DECLARE_ATTR (brightness, 0644, backlight_show_brightness, backlight_store_brightness),
+ DECLARE_ATTR (max_brightness, 0444, backlight_show_max_brightness, NULL),
+};
+
+/**
+ * backlight_device_register - create and register a new object of
+ * backlight_device class.
+ * @name: the name of the new object (must be the same as the name of the
+ * respective framebuffer device).
+ * @devdata: an optional pointer to be stored in the class_device. The
+ * methods may retrieve it by using class_get_devdata (&bd->class_dev).
+ * @bp: the backlight properties structure.
+ * @alloc_bd: (returned) the newly allocated device. Must be used when
+ * deregistering the device. Not relevant if the procedure does not
+ * return 0 (success).
+ *
+ * Creates and registers new backlight class_device. Returns either 0 or
+ * the negative errno.
+ */
+int backlight_device_register(const char *name, void *devdata,
+ struct backlight_properties *bp,
+ struct backlight_device **alloc_bd)
+{
+ int i, rc;
+ struct backlight_device *new_bd;
+
+ pr_debug("backlight_device_alloc: name=%s\n", name);
+
+ new_bd = kmalloc (sizeof (struct backlight_device), GFP_KERNEL);
+ if (unlikely (!new_bd))
+ return -ENOMEM;
+
+ init_MUTEX (&new_bd->sem);
+ new_bd->props = bp;
+ memset (&new_bd->class_dev, 0, sizeof (new_bd->class_dev));
+ new_bd->class_dev.class = &backlight_class;
+ strlcpy (new_bd->class_dev.class_id, name, KOBJ_NAME_LEN);
+ class_set_devdata (&new_bd->class_dev, devdata);
+
+ rc = class_device_register (&new_bd->class_dev);
+ if (unlikely (rc)) {
+ kfree (new_bd);
+ return rc;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(bl_class_device_attributes); i++) {
+ rc = class_device_create_file(&new_bd->class_dev,
+ &bl_class_device_attributes[i]);
+ if (unlikely (rc)) {
+ while (--i >= 0)
+ class_device_remove_file(&new_bd->class_dev,
+ &bl_class_device_attributes[i]);
+ class_device_unregister(&new_bd->class_dev);
+ /* No need to kfree(new_bd) since release() method was called */
+ return rc;
+ }
+ }
+
+ *alloc_bd = new_bd;
+ notifier_call_chain (&backlight_device_chain, 0, new_bd);
+
+ return 0;
+}
+EXPORT_SYMBOL(backlight_device_register);
+
+/**
+ * backlight_device_unregister - unregisters a backlight device object.
+ * @bd: the backlight device object to be unregistered and freed.
+ *
+ * Unregisters a previously registered via backlight_device_register object.
+ */
+void backlight_device_unregister(struct backlight_device *bd)
+{
+ int i;
+
+ if (!bd)
+ return;
+
+ pr_debug("backlight_device_unregister: name=%s\n", bd->class_dev.class_id);
+
+ for (i = 0; i < ARRAY_SIZE(bl_class_device_attributes); i++)
+ class_device_remove_file (&bd->class_dev,
+ &bl_class_device_attributes[i]);
+
+ down (&bd->sem);
+ bd->props = NULL;
+ up (&bd->sem);
+
+ class_device_unregister(&bd->class_dev);
+}
+EXPORT_SYMBOL(backlight_device_unregister);
+
+/**
+ * backlight_device_find - find a backlight device by name.
+ * @name: the name of the backlight object to find.
+ *
+ * The reference counter of the returned object as well as on the module
+ * that implements the backlight functions are incremented.
+ */
+struct backlight_device *backlight_device_find(const char *name)
+{
+ struct backlight_device *bd;
+ struct class_device *class_dev =
+ class_device_find (&backlight_class, name);
+
+ if (unlikely (!class_dev))
+ return NULL;
+
+ bd = backlight_device_get (to_backlight_device (class_dev));
+ class_device_put (class_dev);
+ return bd;
+}
+EXPORT_SYMBOL(backlight_device_find);
+
+/**
+ * backlight_device_get - increment reference counter of a backlight device
+ * and on the module that implements the backlight device methods.
+ * @bd: the backlight device object.
+ *
+ * Increments the reference counter on both the backlight device and on the
+ * module that implements this backlight device.
+ */
+struct backlight_device *backlight_device_get(struct backlight_device *bd)
+{
+ struct class_device *class_dev = class_device_get (&bd->class_dev);
+
+ if (likely (class_dev)) {
+ down (&bd->sem);
+ if (likely (bd->props && try_module_get (bd->props->owner))) {
+ up (&bd->sem);
+ return bd;
+ }
+ up (&bd->sem);
+
+ class_device_put(class_dev);
+ }
+ return NULL;
+}
+EXPORT_SYMBOL(backlight_device_get);
+
+/**
+ * backlight_device_put - decrement reference counter of a backlight device.
+ * @ld: the backlight device object.
+ *
+ * Decrements the reference counter on both the backlight device and on the
+ * module that implements this backlight device.
+ */
+void backlight_device_put(struct backlight_device *bd)
+{
+ if (bd) {
+ down (&bd->sem);
+ if (bd->props)
+ module_put(bd->props->owner);
+ up (&bd->sem);
+ class_device_put (&bd->class_dev);
+ }
+}
+EXPORT_SYMBOL(backlight_device_put);
+
+static void __exit backlight_class_exit(void)
+{
+ class_unregister(&backlight_class);
+}
+
+static int __init backlight_class_init(void)
+{
+ return class_register(&backlight_class);
+}
+
+/*
+ * if this is compiled into the kernel, we need to ensure that the
+ * class is registered before users of the class try to register lcd's
+ */
+postcore_initcall(backlight_class_init);
+module_exit(backlight_class_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Jamey Hicks <jamey.hicks@hp.com>, Andrew Zabolotny <zap@homelink.ru>");
+MODULE_DESCRIPTION("Backlight Lowlevel Control Abstraction");
--- linux-2.6.7-rc3/drivers/video/Kconfig 2004-06-11 02:39:30.000000000 +0400
+++ linux/drivers/video/Kconfig 2004-05-29 01:26:15.000000000 +0400
@@ -38,6 +38,38 @@
(e.g. an accelerated X server) and that are not frame buffer
device-aware may cause unexpected results. If unsure, say N.

+config LCD_CLASS_DEVICE
+ tristate "Lowlevel LCD controls"
+ depends on FB
+ help
+ This framework adds support for low-level control of LCD.
+ Some framebuffer devices connect to platform-specific LCD modules
+ in order to have a platform-specific way to control the flat panel
+ (contrast and applying power to the LCD (not to the backlight!)).
+
+ To have support for your specific LCD panel you will have to
+ select the proper drivers which depend on this option.
+
+config LCD_DEVICE
+ bool
+ depends on LCD_CLASS_DEVICE
+ default y
+
+config BACKLIGHT_CLASS_DEVICE
+ tristate "Lowlevel Backlight controls"
+ depends on FB
+ help
+ This framework adds support for low-level control of the LCD
+ backlight. This includes support for brightness and power.
+
+ To have support for your specific LCD panel you will have to
+ select the proper drivers which depend on this option.
+
+config BACKLIGHT_DEVICE
+ bool
+ depends on BACKLIGHT_CLASS_DEVICE
+ default y
+
config FB_CIRRUS
tristate "Cirrus Logic support"
depends on FB && (AMIGA || PCI) && BROKEN
--- linux-2.6.7-rc3/drivers/video/Makefile 2004-06-11 02:39:30.000000000 +0400
+++ linux/drivers/video/Makefile 2004-05-29 01:23:42.000000000 +0400
@@ -13,6 +13,9 @@
obj-$(CONFIG_PPC) += macmodes.o
endif

+obj-$(CONFIG_LCD_CLASS_DEVICE) += lcd.o
+obj-$(CONFIG_BACKLIGHT_CLASS_DEVICE) += backlight.o
+
obj-$(CONFIG_FB_ACORN) += acornfb.o cfbfillrect.o cfbcopyarea.o cfbimgblt.o
obj-$(CONFIG_FB_AMIGA) += amifb.o c2p.o
obj-$(CONFIG_FB_PM2) += pm2fb.o cfbfillrect.o cfbcopyarea.o cfbimgblt.o
-
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