linux-kernel - [PATCH V3] hp_sdc: convert struct timeval to ktime

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Message-Id: <1445599779-11733-1-git-send-email-pingbo.wen@linaro.org>
Date:	Fri, 23 Oct 2015 19:29:39 +0800
From:	WEN Pingbo <pingbo.wen@...aro.org>
To:	arnd@...db.de
Cc:	y2038@...ts.linaro.org, dmitry.torokhov@...il.com,
	linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
	WEN Pingbo <pingbo.wen@...aro.org>
Subject: [PATCH V3] hp_sdc: convert struct timeval to ktime_t

1. struct timeval is not y2038 safe, convert it to ktime_t, and there is no need to handle sec and usec separately

2. hp_sdc.rtv is only used for time diff, monotonic time is better here

Signed-off-by: WEN Pingbo <pingbo.wen@...aro.org>
---

Version 2:
	Using ktime_t instead of struct timespec64
Version 3:
	Commit msg adjustment, and using ktime_to_ns to extract nsecs 

 drivers/input/serio/hp_sdc.c | 16 ++++++----------
 include/linux/hp_sdc.h       |  6 +++---
 2 files changed, 9 insertions(+), 13 deletions(-)

diff --git a/drivers/input/serio/hp_sdc.c b/drivers/input/serio/hp_sdc.c
index 852858e..17e3725 100644
--- a/drivers/input/serio/hp_sdc.c
+++ b/drivers/input/serio/hp_sdc.c
@@ -193,7 +193,7 @@ static void hp_sdc_take(int irq, void *dev_id, uint8_t status, uint8_t data)
 	curr->seq[curr->idx++] = status;
 	curr->seq[curr->idx++] = data;
 	hp_sdc.rqty -= 2;
-	do_gettimeofday(&hp_sdc.rtv);
+	hp_sdc.rtv = ktime_get();
 
 	if (hp_sdc.rqty <= 0) {
 		/* All data has been gathered. */
@@ -306,13 +306,9 @@ static void hp_sdc_tasklet(unsigned long foo)
 	write_lock_irq(&hp_sdc.rtq_lock);
 
 	if (hp_sdc.rcurr >= 0) {
-		struct timeval tv;
+		ktime_t time_diff = ktime_sub(ktime_get(), hp_sdc.rtv);
 
-		do_gettimeofday(&tv);
-		if (tv.tv_sec > hp_sdc.rtv.tv_sec)
-			tv.tv_usec += USEC_PER_SEC;
-
-		if (tv.tv_usec - hp_sdc.rtv.tv_usec > HP_SDC_MAX_REG_DELAY) {
+		if (ktime_to_ns(time_diff) > HP_SDC_MAX_REG_DELAY) {
 			hp_sdc_transaction *curr;
 			uint8_t tmp;
 
@@ -321,8 +317,8 @@ static void hp_sdc_tasklet(unsigned long foo)
 			 * we'll need to figure out a way to communicate
 			 * it back to the application. and be less verbose.
 			 */
-			printk(KERN_WARNING PREFIX "read timeout (%ius)!\n",
-			       (int)(tv.tv_usec - hp_sdc.rtv.tv_usec));
+			printk(KERN_WARNING PREFIX "read timeout (%llins)!\n",
+			       ktime_to_ns(time_diff));
 			curr->idx += hp_sdc.rqty;
 			hp_sdc.rqty = 0;
 			tmp = curr->seq[curr->actidx];
@@ -551,7 +547,7 @@ unsigned long hp_sdc_put(void)
 
 			/* Start a new read */
 			hp_sdc.rqty = curr->seq[curr->idx];
-			do_gettimeofday(&hp_sdc.rtv);
+			hp_sdc.rtv = ktime_get();
 			curr->idx++;
 			/* Still need to lock here in case of spurious irq. */
 			write_lock_irq(&hp_sdc.rtq_lock);
diff --git a/include/linux/hp_sdc.h b/include/linux/hp_sdc.h
index d392975..348a9b5 100644
--- a/include/linux/hp_sdc.h
+++ b/include/linux/hp_sdc.h
@@ -47,9 +47,9 @@
 #endif
 
 
-/* No 4X status reads take longer than this (in usec).
+/* No 4X status reads take longer than this (in nsec).
  */
-#define HP_SDC_MAX_REG_DELAY 20000
+#define HP_SDC_MAX_REG_DELAY 20000000
 
 typedef void (hp_sdc_irqhook) (int irq, void *dev_id, 
 			       uint8_t status, uint8_t data);
@@ -281,7 +281,7 @@ typedef struct {
 	hp_sdc_transaction *tq[HP_SDC_QUEUE_LEN]; /* All pending read/writes */
 
 	int		rcurr, rqty;	/* Current read transact in process */
-	struct timeval	rtv;		/* Time when current read started */
+	ktime_t		rtv;		/* Time when current read started */
 	int		wcurr;		/* Current write transact in process */
 
 	int		dev_err;	/* carries status from registration */
-- 
1.9.1

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