W1: allow changing w1 module parameters through sysfs, add parameter
    descriptions and document them in Documentation/kernel-parameters.txt

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
---

 Documentation/kernel-parameters.txt |   19 ++++++++++++++++---
 drivers/w1/w1.c                     |   12 ++++++++----
 2 files changed, 24 insertions(+), 7 deletions(-)

Index: dtor/drivers/w1/w1.c
===================================================================
--- dtor.orig/drivers/w1/w1.c
+++ dtor/drivers/w1/w1.c
@@ -43,12 +43,16 @@ MODULE_AUTHOR("Evgeniy Polyakov <johnpol
 MODULE_DESCRIPTION("Driver for 1-wire Dallas network protocol.");
 
 static int w1_scan_interval = 10;
+module_param_named(scan_interval, w1_scan_interval, int, S_IWUSR | S_IRUGO);
+MODULE_PARM_DESC(scan_interval, "Interval between scans for slave devices on a wire.");
+
 static int w1_max_slave_count = 10;
-static int w1_max_slave_ttl = 10;
+module_param_named(max_slave_count, w1_max_slave_count, int, S_IWUSR | S_IRUGO);
+MODULE_PARM_DESC(max_slave_count, "Maximum number of slaves we allow on a wire.");
 
-module_param_named(scan_interval, w1_scan_interval, int, 0);
-module_param_named(max_slave_count, w1_max_slave_count, int, 0);
-module_param_named(slave_ttl, w1_max_slave_ttl, int, 0);
+static int w1_max_slave_ttl = 10;
+module_param_named(slave_ttl, w1_max_slave_ttl, int, S_IWUSR | S_IRUGO);
+MODULE_PARM_DESC(slave_ttl, "Number of unsuccessful scans before slave device is deleted.");
 
 struct device_driver w1_master_driver = {
 	.name = "master",
Index: dtor/Documentation/kernel-parameters.txt
===================================================================
--- dtor.orig/Documentation/kernel-parameters.txt
+++ dtor/Documentation/kernel-parameters.txt
@@ -78,6 +78,7 @@ restrictions referred to are that the re
 	V4L	Video For Linux support is enabled.
 	VGA	The VGA console has been enabled.
 	VT	Virtual terminal support is enabled.
+	W1	Dallas 1-Wire support is enabled.
 	WDT	Watchdog support is enabled.
 	XT	IBM PC/XT MFM hard disk support is enabled.
 	X86-64	X86-64 architecture is enabled.
@@ -1471,11 +1472,23 @@ running once the system is up.
 
 	vmhalt=		[KNL,S390]
 
-	vmpoff=		[KNL,S390] 
- 
+	vmpoff=		[KNL,S390]
+
+	w1.max_slave_count=
+			[HW,W1] Maximum number of slave devices we expect on
+			a wire (for one master). Default is 10.
+
+	w1.scan_interval=
+			[HW,W1] Interval between scans for connected slave
+			devices on a wire. Default is 10 sec.
+
+	w1.slave_ttl=	[HW,W1] Number of unsuccessful scans before slave
+			device is declared disconncted and removed from the
+			bus. Default is 10.
+
 	waveartist=	[HW,OSS]
 			Format: <io>,<irq>,<dma>,<dma2>
- 
+
 	wd33c93=	[HW,SCSI]
 			See header of drivers/scsi/wd33c93.c.