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authorDavid Fries <David@Fries.net>2014-01-16 08:29:18 +0400
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-02-08 03:40:17 +0400
commit9fcbbac5ded489c3a4e121343db999dd51cd6c75 (patch)
tree1207602c8d7cc2da54784114a5d32d9ed6924b58 /drivers/w1/w1.h
parent70b34d2ed807b722413894975a8c60617defb887 (diff)
downloadlinux-9fcbbac5ded489c3a4e121343db999dd51cd6c75.tar.xz
w1: process w1 netlink commands in w1_process thread
Netlink is a socket interface and is expected to be asynchronous. Clients can now make w1 requests without blocking by making use of the w1_master thread to process netlink commands which was previously only used for doing an automatic bus search. Signed-off-by: David Fries <David@Fries.net> Acked-by: Evgeniy Polyakov <zbr@ioremap.net> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/w1/w1.h')
-rw-r--r--drivers/w1/w1.h32
1 files changed, 30 insertions, 2 deletions
diff --git a/drivers/w1/w1.h b/drivers/w1/w1.h
index 3376bfbb10f4..a096ef40119e 100644
--- a/drivers/w1/w1.h
+++ b/drivers/w1/w1.h
@@ -58,6 +58,7 @@ struct w1_reg_num
#define W1_RESUME_CMD 0xA5
#define W1_SLAVE_ACTIVE 0
+#define W1_SLAVE_DETACH 1
struct w1_slave
{
@@ -74,7 +75,6 @@ struct w1_slave
struct w1_family *family;
void *family_data;
struct device dev;
- struct completion released;
};
typedef void (*w1_slave_found_callback)(struct w1_master *, u64);
@@ -171,7 +171,14 @@ struct w1_master
struct list_head w1_master_entry;
struct module *owner;
unsigned char name[W1_MAXNAMELEN];
+ /* list_mutex protects just slist and async_list so slaves can be
+ * searched for and async commands added while the master has
+ * w1_master.mutex locked and is operating on the bus.
+ * lock order w1_mlock, w1_master.mutex, w1_master_list_mutex
+ */
+ struct mutex list_mutex;
struct list_head slist;
+ struct list_head async_list;
int max_slave_count, slave_count;
unsigned long attempts;
int slave_ttl;
@@ -205,11 +212,29 @@ struct w1_master
u32 seq;
};
+/**
+ * struct w1_async_cmd - execute callback from the w1_process kthread
+ * @async_entry: link entry
+ * @cb: callback function, must list_del and destroy this list before
+ * returning
+ *
+ * When inserted into the w1_master async_list, w1_process will execute
+ * the callback. Embed this into the structure with the command details.
+ */
+struct w1_async_cmd {
+ struct list_head async_entry;
+ void (*cb)(struct w1_master *dev, struct w1_async_cmd *async_cmd);
+};
+
int w1_create_master_attributes(struct w1_master *);
void w1_destroy_master_attributes(struct w1_master *master);
void w1_search(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb);
void w1_search_devices(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb);
+/* call w1_unref_slave to release the reference counts w1_search_slave added */
struct w1_slave *w1_search_slave(struct w1_reg_num *id);
+/* decrements the reference on sl->master and sl, and cleans up if zero
+ * returns the reference count after it has been decremented */
+int w1_unref_slave(struct w1_slave *sl);
void w1_slave_found(struct w1_master *dev, u64 rn);
void w1_search_process_cb(struct w1_master *dev, u8 search_type,
w1_slave_found_callback cb);
@@ -224,7 +249,8 @@ struct w1_master *w1_search_master_id(u32 id);
*/
void w1_reconnect_slaves(struct w1_family *f, int attach);
int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn);
-void w1_slave_detach(struct w1_slave *sl);
+/* 0 success, otherwise EBUSY */
+int w1_slave_detach(struct w1_slave *sl);
u8 w1_triplet(struct w1_master *dev, int bdir);
void w1_write_8(struct w1_master *, u8);
@@ -260,6 +286,8 @@ extern int w1_max_slave_ttl;
extern struct list_head w1_masters;
extern struct mutex w1_mlock;
+/* returns 1 if there were commands to executed 0 otherwise */
+extern int w1_process_callbacks(struct w1_master *dev);
extern int w1_process(void *);
#endif /* __KERNEL__ */