2005-09-26 14:04:21 +08:00
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/*
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* Miscellaneous procedures for dealing with the PowerMac hardware.
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* Contains support for the backlight.
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*
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* Copyright (C) 2000 Benjamin Herrenschmidt
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2006-06-25 20:47:08 +08:00
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* Copyright (C) 2006 Michael Hanselmann <linux-kernel@hansmi.ch>
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2005-09-26 14:04:21 +08:00
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*
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*/
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#include <linux/kernel.h>
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2006-06-25 20:47:08 +08:00
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#include <linux/fb.h>
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#include <linux/backlight.h>
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2005-09-26 14:04:21 +08:00
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#include <asm/prom.h>
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#include <asm/backlight.h>
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2006-06-25 20:47:08 +08:00
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#define OLD_BACKLIGHT_MAX 15
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2005-09-26 14:04:21 +08:00
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2006-06-25 20:47:08 +08:00
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/* Protect the pmac_backlight variable */
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DEFINE_MUTEX(pmac_backlight_mutex);
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2005-09-26 14:04:21 +08:00
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2006-06-25 20:47:08 +08:00
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/* Main backlight storage
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*
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* Backlight drivers in this variable are required to have the "props"
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* attribute set and to have an update_status function.
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*
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* We can only store one backlight here, but since Apple laptops have only one
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* internal display, it doesn't matter. Other backlight drivers can be used
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* independently.
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*
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* Lock ordering:
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* pmac_backlight_mutex (global, main backlight)
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* pmac_backlight->sem (backlight class)
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*/
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struct backlight_device *pmac_backlight;
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2005-09-26 14:04:21 +08:00
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2006-06-25 20:47:08 +08:00
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int pmac_has_backlight_type(const char *type)
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2005-09-26 14:04:21 +08:00
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{
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2006-06-25 20:47:08 +08:00
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struct device_node* bk_node = find_devices("backlight");
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2005-09-26 14:04:21 +08:00
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if (bk_node) {
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2006-06-25 20:47:08 +08:00
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char *prop = get_property(bk_node, "backlight-control", NULL);
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if (prop && strncmp(prop, type, strlen(type)) == 0)
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return 1;
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2005-09-26 14:04:21 +08:00
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}
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2006-06-25 20:47:08 +08:00
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return 0;
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2005-09-26 14:04:21 +08:00
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}
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2006-06-25 20:47:08 +08:00
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int pmac_backlight_curve_lookup(struct fb_info *info, int value)
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2005-09-26 14:04:21 +08:00
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{
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2006-06-25 20:47:08 +08:00
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int level = (FB_BACKLIGHT_LEVELS - 1);
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if (info && info->bl_dev) {
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int i, max = 0;
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/* Look for biggest value */
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for (i = 0; i < FB_BACKLIGHT_LEVELS; i++)
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max = max((int)info->bl_curve[i], max);
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/* Look for nearest value */
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for (i = 0; i < FB_BACKLIGHT_LEVELS; i++) {
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int diff = abs(info->bl_curve[i] - value);
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if (diff < max) {
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max = diff;
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level = i;
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}
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}
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}
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return level;
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2005-09-26 14:04:21 +08:00
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}
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2006-06-25 20:47:08 +08:00
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static void pmac_backlight_key(int direction)
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2005-09-26 14:04:21 +08:00
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{
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2006-06-25 20:47:08 +08:00
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mutex_lock(&pmac_backlight_mutex);
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if (pmac_backlight) {
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struct backlight_properties *props;
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int brightness;
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down(&pmac_backlight->sem);
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props = pmac_backlight->props;
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brightness = props->brightness +
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((direction?-1:1) * (props->max_brightness / 15));
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if (brightness < 0)
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brightness = 0;
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else if (brightness > props->max_brightness)
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brightness = props->max_brightness;
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props->brightness = brightness;
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props->update_status(pmac_backlight);
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up(&pmac_backlight->sem);
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}
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mutex_unlock(&pmac_backlight_mutex);
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2005-09-26 14:04:21 +08:00
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}
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2006-06-25 20:47:08 +08:00
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void pmac_backlight_key_up()
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2005-09-26 14:04:21 +08:00
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{
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2006-06-25 20:47:08 +08:00
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pmac_backlight_key(0);
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2005-09-26 14:04:21 +08:00
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}
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2006-06-25 20:47:08 +08:00
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void pmac_backlight_key_down()
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2005-09-26 14:04:21 +08:00
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{
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2006-06-25 20:47:08 +08:00
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pmac_backlight_key(1);
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2005-09-26 14:04:21 +08:00
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}
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2006-06-25 20:47:08 +08:00
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int pmac_backlight_set_legacy_brightness(int brightness)
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2005-09-26 14:04:21 +08:00
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{
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2006-06-25 20:47:08 +08:00
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int error = -ENXIO;
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mutex_lock(&pmac_backlight_mutex);
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if (pmac_backlight) {
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struct backlight_properties *props;
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down(&pmac_backlight->sem);
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props = pmac_backlight->props;
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props->brightness = brightness *
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2006-06-28 19:26:55 +08:00
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(props->max_brightness + 1) /
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(OLD_BACKLIGHT_MAX + 1);
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if (props->brightness > props->max_brightness)
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props->brightness = props->max_brightness;
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else if (props->brightness < 0)
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props->brightness = 0;
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2006-06-25 20:47:08 +08:00
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props->update_status(pmac_backlight);
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up(&pmac_backlight->sem);
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error = 0;
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2005-09-26 14:04:21 +08:00
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}
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2006-06-25 20:47:08 +08:00
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mutex_unlock(&pmac_backlight_mutex);
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return error;
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2005-09-26 14:04:21 +08:00
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}
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2006-06-25 20:47:08 +08:00
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int pmac_backlight_get_legacy_brightness()
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2005-09-26 14:04:21 +08:00
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{
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2006-06-25 20:47:08 +08:00
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int result = -ENXIO;
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2005-09-26 14:04:21 +08:00
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2006-06-25 20:47:08 +08:00
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mutex_lock(&pmac_backlight_mutex);
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if (pmac_backlight) {
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struct backlight_properties *props;
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2005-09-26 14:04:21 +08:00
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2006-06-25 20:47:08 +08:00
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down(&pmac_backlight->sem);
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props = pmac_backlight->props;
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2006-06-28 19:26:55 +08:00
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2006-06-25 20:47:08 +08:00
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result = props->brightness *
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2006-06-28 19:26:55 +08:00
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(OLD_BACKLIGHT_MAX + 1) /
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(props->max_brightness + 1);
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2006-06-25 20:47:08 +08:00
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up(&pmac_backlight->sem);
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}
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mutex_unlock(&pmac_backlight_mutex);
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2005-09-26 14:04:21 +08:00
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2006-06-25 20:47:08 +08:00
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return result;
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2005-09-26 14:04:21 +08:00
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}
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