linux-kernel - [PATCH v1] Input: tegra-kbc - fix computation of polling time

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Message-Id: <1311981417-31865-1-git-send-email-riyer@nvidia.com>
Date:	Fri, 29 Jul 2011 16:16:57 -0700
From:	riyer@...dia.com
To:	dmitry.torokhov@...il.com
Cc:	rydberg@...omail.se, olof@...om.net, amartin@...dia.com,
	linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
	Rakesh Iyer <riyer@...dia.com>
Subject: [PATCH v1] Input: tegra-kbc - fix computation of polling time

From: Rakesh Iyer <riyer@...dia.com>

Fix a constant definition and computation of polling time.

Signed-off-by: Rakesh Iyer <riyer@...dia.com>
---
 drivers/input/keyboard/tegra-kbc.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/input/keyboard/tegra-kbc.c b/drivers/input/keyboard/tegra-kbc.c
index da3828f..263f6fc 100644
--- a/drivers/input/keyboard/tegra-kbc.c
+++ b/drivers/input/keyboard/tegra-kbc.c
@@ -37,7 +37,7 @@
 #define KBC_ROW_SCAN_DLY	5
 
 /* KBC uses a 32KHz clock so a cycle = 1/32Khz */
-#define KBC_CYCLE_USEC	32
+#define KBC_CYCLE_MS	32
 
 /* KBC Registers */
 
@@ -647,7 +647,7 @@ static int __devinit tegra_kbc_probe(struct platform_device *pdev)
 	debounce_cnt = min(pdata->debounce_cnt, KBC_MAX_DEBOUNCE_CNT);
 	scan_time_rows = (KBC_ROW_SCAN_TIME + debounce_cnt) * num_rows;
 	kbc->repoll_dly = KBC_ROW_SCAN_DLY + scan_time_rows + pdata->repeat_cnt;
-	kbc->repoll_dly = ((kbc->repoll_dly * KBC_CYCLE_USEC) + 999) / 1000;
+	kbc->repoll_dly = (kbc->repoll_dly + KBC_CYCLE_MS - 1) / KBC_CYCLE_MS;
 
 	input_dev->name = pdev->name;
 	input_dev->id.bustype = BUS_HOST;
-- 
1.7.1

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