[PATCH] w1: support auto-load of w1_bq27000 module.

[NeilBrown]

1/ change request_module call to zero-pad single digit
   family numbers.  This appears to be the intention of
   the code, but not what it actually does.

   This means that the alias created for W1_FAMILY_SMEM_01
   might actually be useful.

2/ Define a family name for the BQ27000 battery charge monitor.
   Unfortunately this is the same number as W1_FAMILY_SMEM_01
   so if both a compiled on a system, one module might need to
   be blacklisted.

3/ Add a MODULE_ALIAS for the bq27000.

Signed-off-by: NeilBrown <ne...@suse.de>

diff --git a/drivers/w1/slaves/w1_bq27000.c b/drivers/w1/slaves/w1_bq27000.c
index afbefed5f2c9..caafb1722783 100644
--- a/drivers/w1/slaves/w1_bq27000.c
+++ b/drivers/w1/slaves/w1_bq27000.c
@@ -88,7 +88,7 @@ static struct w1_family_ops w1_bq27000_fops = {
 };
 
 static struct w1_family w1_bq27000_family = {
-       .fid = 1,
+       .fid = W1_FAMILY_BQ27000,
        .fops = &w1_bq27000_fops,
 };
 
@@ -111,7 +111,7 @@ module_exit(w1_bq27000_exit);
 
 module_param(F_ID, int, S_IRUSR);
 MODULE_PARM_DESC(F_ID, "1-wire slave FID for BQ device");
-
+MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_BQ27000));
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Texas Instruments Ltd");
 MODULE_DESCRIPTION("HDQ/1-wire slave driver bq27000 battery monitor chip");
diff --git a/drivers/w1/w1.c b/drivers/w1/w1.c
index 592f7edc671e..181f41cb960b 100644
--- a/drivers/w1/w1.c
+++ b/drivers/w1/w1.c
@@ -727,7 +727,7 @@ int w1_attach_slave_device(struct w1_master *dev, struct 
w1_reg_num *rn)
 
        /* slave modules need to be loaded in a context with unlocked mutex */
        mutex_unlock(&dev->mutex);
-       request_module("w1-family-0x%0x", rn->family);
+       request_module("w1-family-0x%02x", rn->family);
        mutex_lock(&dev->mutex);
 
        spin_lock(&w1_flock);
diff --git a/drivers/w1/w1_family.h b/drivers/w1/w1_family.h
index 0d18365b61ad..ed5dcb80a1f7 100644
--- a/drivers/w1/w1_family.h
+++ b/drivers/w1/w1_family.h
@@ -27,6 +27,7 @@
 #include <linux/atomic.h>
 
 #define W1_FAMILY_DEFAULT      0
+#define W1_FAMILY_BQ27000      0x01
 #define W1_FAMILY_SMEM_01      0x01
 #define W1_FAMILY_SMEM_81      0x81
 #define W1_THERM_DS18S20       0x10

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