w1: add family based automatic module loading

This patch allows the 1-wire bus to autoload the corresponding module
for each slave being attached.
This works similar to bluetooth protocols.

Signed-off-by: Alexander Stein <alexander.stein@informatik.tu-chemnitz.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/w1/w1.generic

@@ -25,8 +25,8 @@ When a w1 master driver registers with the w1 subsystem, the following occurs:
  - sysfs entries for that w1 master are created
  - the w1 bus is periodically searched for new slave devices
 
-When a device is found on the bus, w1 core checks if driver for its family is
-loaded. If so, the family driver is attached to the slave.
+When a device is found on the bus, w1 core tries to load the driver for its family
+and check if it is loaded. If so, the family driver is attached to the slave.
 If there is no driver for the family, default one is assigned, which allows to perform
 almost any kind of operations. Each logical operation is a transaction
 in nature, which can contain several (two or one) low-level operations.

drivers/w1/slaves/w1_ds2408.c

@@ -22,6 +22,7 @@
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Jean-Francois Dagenais <dagenaisj@sonatest.com>");
 MODULE_DESCRIPTION("w1 family 29 driver for DS2408 8 Pin IO");
+MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_DS2408));
 
 
 #define W1_F29_RETRIES		3

drivers/w1/slaves/w1_ds2413.c

@@ -23,6 +23,7 @@
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Mariusz Bialonczyk <manio@skyboo.net>");
 MODULE_DESCRIPTION("w1 family 3a driver for DS2413 2 Pin IO");
+MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_DS2413));
 
 #define W1_F3A_RETRIES                     3
 #define W1_F3A_FUNC_PIO_ACCESS_READ        0xF5

drivers/w1/slaves/w1_ds2423.c

@@ -164,3 +164,4 @@ module_exit(w1_f1d_exit);
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Mika Laitio <lamikr@pilppa.org>");
 MODULE_DESCRIPTION("w1 family 1d driver for DS2423, 4 counters and 4kb ram");
+MODULE_ALIAS("w1-family-" __stringify(W1_COUNTER_DS2423));

drivers/w1/slaves/w1_ds2431.c

@@ -310,3 +310,4 @@ module_exit(w1_f2d_fini);
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Bernhard Weirich <bernhard.weirich@riedel.net>");
 MODULE_DESCRIPTION("w1 family 2d driver for DS2431, 1kb EEPROM");
+MODULE_ALIAS("w1-family-" __stringify(W1_EEPROM_DS2431));

drivers/w1/slaves/w1_ds2433.c

@@ -29,6 +29,7 @@
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Ben Gardner <bgardner@wabtec.com>");
 MODULE_DESCRIPTION("w1 family 23 driver for DS2433, 4kb EEPROM");
+MODULE_ALIAS("w1-family-" __stringify(W1_EEPROM_DS2433));
 
 #define W1_EEPROM_SIZE		512
 #define W1_PAGE_COUNT		16

drivers/w1/slaves/w1_ds2760.c

@@ -203,3 +203,4 @@ module_exit(w1_ds2760_exit);
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Szabolcs Gyurko <szabolcs.gyurko@tlt.hu>");
 MODULE_DESCRIPTION("1-wire Driver Dallas 2760 battery monitor chip");
+MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_DS2760));

drivers/w1/slaves/w1_ds2780.c

@@ -188,3 +188,4 @@ module_exit(w1_ds2780_exit);
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Clifton Barnes <cabarnes@indesign-llc.com>");
 MODULE_DESCRIPTION("1-wire Driver for Maxim/Dallas DS2780 Stand-Alone Fuel Gauge IC");
+MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_DS2780));

drivers/w1/slaves/w1_ds2781.c

@@ -186,3 +186,4 @@ module_exit(w1_ds2781_exit);
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Renata Sayakhova <renata@oktetlabs.ru>");
 MODULE_DESCRIPTION("1-wire Driver for Maxim/Dallas DS2781 Stand-Alone Fuel Gauge IC");
+MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_DS2781));

drivers/w1/slaves/w1_ds28e04.c

@@ -27,6 +27,7 @@
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Markus Franke <franke.m@sebakmt.com>, <franm@hrz.tu-chemnitz.de>");
 MODULE_DESCRIPTION("w1 family 1C driver for DS28E04, 4kb EEPROM and PIO");
+MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_DS28E04));
 
 /* Allow the strong pullup to be disabled, but default to enabled.
  * If it was disabled a parasite powered device might not get the required

drivers/w1/slaves/w1_smem.c

@@ -34,6 +34,8 @@
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Evgeniy Polyakov <zbr@ioremap.net>");
 MODULE_DESCRIPTION("Driver for 1-wire Dallas network protocol, 64bit memory family.");
+MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_SMEM_01));
+MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_SMEM_81));
 
 static struct w1_family w1_smem_family_01 = {
 	.fid = W1_FAMILY_SMEM_01,

drivers/w1/slaves/w1_therm.c

@@ -36,6 +36,11 @@
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Evgeniy Polyakov <zbr@ioremap.net>");
 MODULE_DESCRIPTION("Driver for 1-wire Dallas network protocol, temperature family.");
+MODULE_ALIAS("w1-family-" __stringify(W1_THERM_DS18S20));
+MODULE_ALIAS("w1-family-" __stringify(W1_THERM_DS1822));
+MODULE_ALIAS("w1-family-" __stringify(W1_THERM_DS18B20));
+MODULE_ALIAS("w1-family-" __stringify(W1_THERM_DS1825));
+MODULE_ALIAS("w1-family-" __stringify(W1_THERM_DS28EA00));
 
 /* Allow the strong pullup to be disabled, but default to enabled.
  * If it was disabled a parasite powered device might not get the require

drivers/w1/w1.c

@@ -680,6 +680,8 @@ static int w1_attach_slave_device(struct w1_master *dev, struct w1_reg_num *rn)
 	atomic_set(&sl->refcnt, 0);
 	init_completion(&sl->released);
 
+	request_module("w1-family-0x%0x", rn->family);
+
 	spin_lock(&w1_flock);
 	f = w1_family_registered(rn->family);
 	if (!f) {