linux-kernel - [PATCH 2/3] hpwdt: allow full range of timer values supported by hardware

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Date:	Wed,  2 Jun 2010 16:23:40 -0600
From:	dann frazier <dannf@...com>
To:	Wim Van Sebroeck <wim@...ana.be>
Cc:	linux-kernel@...r.kernel.org,
	Thomas Mingarelli <thomas.mingarelli@...com>,
	dann frazier <dannf@...com>
Subject: [PATCH 2/3] hpwdt: allow full range of timer values supported by hardware

The hpwdt timer is a 16 bit value with 128ms resolution.
Let applications use this entire range.

Signed-off-by: dann frazier <dannf@...com>
---
 drivers/watchdog/hpwdt.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/watchdog/hpwdt.c b/drivers/watchdog/hpwdt.c
index af61fb6..e3bf645 100644
--- a/drivers/watchdog/hpwdt.c
+++ b/drivers/watchdog/hpwdt.c
@@ -50,6 +50,8 @@
 #define HPWDT_VERSION			"1.1.1"
 
 #define SECS_TO_TICKS(secs) ((secs) * 1000 / 128)
+#define TICKS_TO_SECS(ticks) ((ticks) * 128 / 1000)
+#define HPWDT_MAX_TIMER	TICKS_TO_SECS(65535)
 
 struct bios32_service_dir {
 	u32 signature;
@@ -443,8 +445,7 @@ static void hpwdt_ping(void)
 
 static int hpwdt_change_timer(int new_margin)
 {
-	/* Arbitrary, can't find the card's limits */
-	if (new_margin < 5 || new_margin > 600) {
+	if (new_margin < 1 || new_margin > HPWDT_MAX_TIMER) {
 		printk(KERN_WARNING
 			"hpwdt: New value passed in is invalid: %d seconds.\n",
 			new_margin);
-- 
1.7.1

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