#include <linux/kernel.h>
#include <linux/fb.h>
#include <linux/backlight.h>
+#include <linux/adb.h>
+#include <linux/pmu.h>
+#include <asm/atomic.h>
#include <asm/prom.h>
#include <asm/backlight.h>
#define OLD_BACKLIGHT_MAX 15
-static void pmac_backlight_key_worker(void *data);
-static DECLARE_WORK(pmac_backlight_key_work, pmac_backlight_key_worker, NULL);
+static void pmac_backlight_key_worker(struct work_struct *work);
+static void pmac_backlight_set_legacy_worker(struct work_struct *work);
-/* Although this variable is used in interrupt context, it makes no sense to
- * protect it. No user is able to produce enough key events per second and
+static DECLARE_WORK(pmac_backlight_key_work, pmac_backlight_key_worker);
+static DECLARE_WORK(pmac_backlight_set_legacy_work, pmac_backlight_set_legacy_worker);
+
+/* Although these variables are used in interrupt context, it makes no sense to
+ * protect them. No user is able to produce enough key events per second and
* notice the errors that might happen.
*/
static int pmac_backlight_key_queued;
+static int pmac_backlight_set_legacy_queued;
+
+/* The via-pmu code allows the backlight to be grabbed, in which case the
+ * in-kernel control of the brightness needs to be disabled. This should
+ * only be used by really old PowerBooks.
+ */
+static atomic_t kernel_backlight_disabled = ATOMIC_INIT(0);
-/* Protect the pmac_backlight variable */
+/* Protect the pmac_backlight variable below.
+ You should hold this lock when using the pmac_backlight pointer to
+ prevent its potential removal. */
DEFINE_MUTEX(pmac_backlight_mutex);
/* Main backlight storage
*
- * Backlight drivers in this variable are required to have the "props"
+ * Backlight drivers in this variable are required to have the "ops"
* attribute set and to have an update_status function.
*
* We can only store one backlight here, but since Apple laptops have only one
* internal display, it doesn't matter. Other backlight drivers can be used
* independently.
*
- * Lock ordering:
- * pmac_backlight_mutex (global, main backlight)
- * pmac_backlight->sem (backlight class)
*/
struct backlight_device *pmac_backlight;
int pmac_has_backlight_type(const char *type)
{
- struct device_node* bk_node = find_devices("backlight");
+ struct device_node* bk_node = of_find_node_by_name(NULL, "backlight");
if (bk_node) {
- char *prop = get_property(bk_node, "backlight-control", NULL);
- if (prop && strncmp(prop, type, strlen(type)) == 0)
+ const char *prop = of_get_property(bk_node,
+ "backlight-control", NULL);
+ if (prop && strncmp(prop, type, strlen(type)) == 0) {
+ of_node_put(bk_node);
return 1;
+ }
+ of_node_put(bk_node);
}
return 0;
return level;
}
-static void pmac_backlight_key_worker(void *data)
+static void pmac_backlight_key_worker(struct work_struct *work)
{
+ if (atomic_read(&kernel_backlight_disabled))
+ return;
+
mutex_lock(&pmac_backlight_mutex);
if (pmac_backlight) {
struct backlight_properties *props;
int brightness;
- down(&pmac_backlight->sem);
- props = pmac_backlight->props;
+ props = &pmac_backlight->props;
brightness = props->brightness +
((pmac_backlight_key_queued?-1:1) *
brightness = props->max_brightness;
props->brightness = brightness;
- props->update_status(pmac_backlight);
-
- up(&pmac_backlight->sem);
+ backlight_update_status(pmac_backlight);
}
mutex_unlock(&pmac_backlight_mutex);
}
+/* This function is called in interrupt context */
void pmac_backlight_key(int direction)
{
+ if (atomic_read(&kernel_backlight_disabled))
+ return;
+
/* we can receive multiple interrupts here, but the scheduled work
* will run only once, with the last value
*/
schedule_work(&pmac_backlight_key_work);
}
-int pmac_backlight_set_legacy_brightness(int brightness)
+static int __pmac_backlight_set_legacy_brightness(int brightness)
{
int error = -ENXIO;
if (pmac_backlight) {
struct backlight_properties *props;
- down(&pmac_backlight->sem);
- props = pmac_backlight->props;
+ props = &pmac_backlight->props;
props->brightness = brightness *
(props->max_brightness + 1) /
(OLD_BACKLIGHT_MAX + 1);
else if (props->brightness < 0)
props->brightness = 0;
- props->update_status(pmac_backlight);
- up(&pmac_backlight->sem);
+ backlight_update_status(pmac_backlight);
error = 0;
}
return error;
}
+static void pmac_backlight_set_legacy_worker(struct work_struct *work)
+{
+ if (atomic_read(&kernel_backlight_disabled))
+ return;
+
+ __pmac_backlight_set_legacy_brightness(pmac_backlight_set_legacy_queued);
+}
+
+/* This function is called in interrupt context */
+void pmac_backlight_set_legacy_brightness_pmu(int brightness) {
+ if (atomic_read(&kernel_backlight_disabled))
+ return;
+
+ pmac_backlight_set_legacy_queued = brightness;
+ schedule_work(&pmac_backlight_set_legacy_work);
+}
+
+int pmac_backlight_set_legacy_brightness(int brightness)
+{
+ return __pmac_backlight_set_legacy_brightness(brightness);
+}
+
int pmac_backlight_get_legacy_brightness()
{
int result = -ENXIO;
if (pmac_backlight) {
struct backlight_properties *props;
- down(&pmac_backlight->sem);
- props = pmac_backlight->props;
+ props = &pmac_backlight->props;
result = props->brightness *
(OLD_BACKLIGHT_MAX + 1) /
(props->max_brightness + 1);
-
- up(&pmac_backlight->sem);
}
mutex_unlock(&pmac_backlight_mutex);
return result;
}
+void pmac_backlight_disable()
+{
+ atomic_inc(&kernel_backlight_disabled);
+}
+
+void pmac_backlight_enable()
+{
+ atomic_dec(&kernel_backlight_disabled);
+}
+
EXPORT_SYMBOL_GPL(pmac_backlight);
EXPORT_SYMBOL_GPL(pmac_backlight_mutex);
EXPORT_SYMBOL_GPL(pmac_has_backlight_type);
projects / linux-2.6-omap-h63xx.git / blobdiff