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Date: Thu, 24 Nov 2011 11:06:10 +0900
From: MyungJoo Ham <myungjoo.ham@...sung.com>
To: linux-kernel@...r.kernel.org
Cc: Mike Lockwood <lockwood@...roid.com>,
Arve Hjønnevåg <arve@...roid.com>,
Kyungmin Park <kyungmin.park@...sung.com>,
Donggeun Kim <dg77.kim@...sung.com>, Greg KH <gregkh@...e.de>,
Arnd Bergmann <arnd@...db.de>,
MyungJoo Ham <myungjoo.ham@...il.com>
Subject: [RFC PATCH 2/3] Multistate Switch Class: add notifier block
State changes of switch devices have been notified via kobjet_uevent.
This patch adds notifier interfaces in order to allow device drivers to
get notified easily. Along with notifier interface,
switch_get_switch_dev() function is added so that device drivers may
discover a switch_dev easily.
Signed-off-by: Donggeun Kim <dg77.kim@...sung.com>
Signed-off-by: MyungJoo Ham <myungjoo.ham@...sung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@...sung.com>
---
drivers/misc/switch_class.c | 47 +++++++++++++++++++++++++++++++++++++++++++
include/linux/switch.h | 24 ++++++++++++++++++++++
2 files changed, 71 insertions(+), 0 deletions(-)
diff --git a/drivers/misc/switch_class.c b/drivers/misc/switch_class.c
index b17a4be..ab574a3 100644
--- a/drivers/misc/switch_class.c
+++ b/drivers/misc/switch_class.c
@@ -33,6 +33,9 @@
struct class *switch_class;
static atomic_t device_count;
+static LIST_HEAD(switch_dev_list);
+static DEFINE_MUTEX(switch_dev_list_lock);
+
static ssize_t state_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
@@ -76,6 +79,8 @@ void switch_set_state(struct switch_dev *sdev, u32 state)
if (sdev->state != state) {
sdev->state = state;
+ raw_notifier_call_chain(&sdev->nh, sdev->state, NULL);
+
prop_buf = (char *)get_zeroed_page(GFP_KERNEL);
if (prop_buf) {
length = name_show(sdev->dev, NULL, prop_buf);
@@ -105,6 +110,36 @@ void switch_set_state(struct switch_dev *sdev, u32 state)
}
EXPORT_SYMBOL_GPL(switch_set_state);
+struct switch_dev *switch_get_switch_dev(const char *switch_name)
+{
+ struct switch_dev *sd;
+
+ mutex_lock(&switch_dev_list_lock);
+ list_for_each_entry(sd, &switch_dev_list, entry) {
+ if (!strcmp(sd->name, switch_name))
+ goto out;
+ }
+ sd = NULL;
+out:
+ mutex_unlock(&switch_dev_list_lock);
+ return sd;
+}
+EXPORT_SYMBOL_GPL(switch_get_switch_dev);
+
+int switch_register_notifier(struct switch_dev *sdev,
+ struct notifier_block *bh)
+{
+ return raw_notifier_chain_register(&sdev->nh, bh);
+}
+EXPORT_SYMBOL_GPL(switch_register_notifier);
+
+int switch_unregister_notifier(struct switch_dev *sdev,
+ struct notifier_block *bh)
+{
+ return raw_notifier_chain_register(&sdev->nh, bh);
+}
+EXPORT_SYMBOL_GPL(switch_unregister_notifier);
+
static int create_switch_class(void)
{
if (!switch_class) {
@@ -140,8 +175,15 @@ int switch_dev_register(struct switch_dev *sdev)
if (ret < 0)
goto err_create_file_2;
+ RAW_INIT_NOTIFIER_HEAD(&sdev->nh);
+
dev_set_drvdata(sdev->dev, sdev);
sdev->state = 0;
+
+ mutex_lock(&switch_dev_list_lock);
+ list_add(&sdev->entry, &switch_dev_list);
+ mutex_unlock(&switch_dev_list_lock);
+
return 0;
err_create_file_2:
@@ -159,6 +201,11 @@ void switch_dev_unregister(struct switch_dev *sdev)
device_remove_file(sdev->dev, &dev_attr_name);
device_remove_file(sdev->dev, &dev_attr_state);
device_destroy(switch_class, MKDEV(0, sdev->index));
+
+ mutex_lock(&switch_dev_list_lock);
+ list_del(&sdev->entry);
+ mutex_unlock(&switch_dev_list_lock);
+
dev_set_drvdata(sdev->dev, NULL);
}
EXPORT_SYMBOL_GPL(switch_dev_unregister);
diff --git a/include/linux/switch.h b/include/linux/switch.h
index a4bddf7..0e43901 100644
--- a/include/linux/switch.h
+++ b/include/linux/switch.h
@@ -23,6 +23,8 @@
#ifndef __LINUX_SWITCH_H__
#define __LINUX_SWITCH_H__
+#include <linux/notifier.h>
+
struct switch_dev {
/* --- User initializing data --- */
const char *name;
@@ -35,6 +37,8 @@ struct switch_dev {
/* --- Internal data. Please do not set. --- */
u32 state;
int index;
+ struct raw_notifier_head nh;
+ struct list_head entry;
};
struct gpio_switch_platform_data {
@@ -59,6 +63,12 @@ static inline u32 switch_get_state(struct switch_dev *sdev)
}
extern void switch_set_state(struct switch_dev *sdev, u32 state);
+
+extern struct switch_dev *switch_get_switch_dev(const char *switch_name);
+extern int switch_register_notifier(struct switch_dev *sdev,
+ struct notifier_block *bh);
+extern int switch_unregister_notifier(struct switch_dev *sdev,
+ struct notifier_block *bh);
#else /* CONFIG_MULTISTATE_SWITCH */
static inline int switch_dev_register(struct switch_dev *sdev)
{
@@ -73,5 +83,19 @@ static inline u32 switch_get_state(struct switch_dev *sdev)
}
static inline void switch_set_state(struct switch_dev *sdev, u32 state) { }
+static inline struct switch_dev *switch_get_switch_dev(const char *switch_name)
+{
+ return NULL;
+}
+static inline int switch_register_notifier(struct switch_dev *sdev,
+ struct notifier_block *bh)
+{
+ return 0;
+}
+static inline int switch_unregister_notifier(struct switch_dev *sdev,
+ struct notifier_block *bh)
+{
+ return 0;
+}
#endif /* CONFIG_MULTISTATE_SWITCH */
#endif /* __LINUX_SWITCH_H__ */
--
1.7.4.1
--
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