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authorArnd Bergmann <arnd@arndb.de>2015-11-25 13:11:55 -0200
committerMauro Carvalho Chehab <mchehab@osg.samsung.com>2015-12-03 16:17:57 -0200
commit8459503295d9ed3aaf5a2089a2fbdbdb5e9a9576 (patch)
tree4d307898eedb66a025c607542c4471dffee2ecfc
parent21312f6ddb1710750761c4b140b7367208b4f89e (diff)
[media] staging: media: lirc: Replace timeval with ktime_t in lirc_serial.c
'struct timeval tv' is used to get current time. 'static struct timeval lasttv' is used to get last interrupt time. 32-bit systems using 'struct timeval' will break in the year 2038, so we have to replace that code with more appropriate types. This patch changes the lirc_serial.c file of media: lirc to use ktime_t. ktime_get() is better than using do_gettimeofday(), because it uses the monotonic clock. ktime_sub is used to subtract two ktime variables. The check to test time going backwards is also removed. Intialization to static variable is also removed. ktime_to_us() is used to convert ktime_t to microsecond value. deltv is changed to delkt, a ktime_t type varibale from long to assign the ktime_sub value directly. ktime_compare is used to compare delkt with 15 seconds, which is changed to a nanosecond value by using ktime_set(). Build tested it. Signed-off-by: Tapasweni Pathak <tapaswenipathak@gmail.com> Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
-rw-r--r--drivers/staging/media/lirc/lirc_serial.c50
1 files changed, 17 insertions, 33 deletions
diff --git a/drivers/staging/media/lirc/lirc_serial.c b/drivers/staging/media/lirc/lirc_serial.c
index 64a7b2fc5289..b798b311d32c 100644
--- a/drivers/staging/media/lirc/lirc_serial.c
+++ b/drivers/staging/media/lirc/lirc_serial.c
@@ -59,7 +59,7 @@
#include <linux/ioport.h>
#include <linux/kernel.h>
#include <linux/serial_reg.h>
-#include <linux/time.h>
+#include <linux/ktime.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/wait.h>
@@ -204,7 +204,7 @@ static struct lirc_serial hardware[] = {
#define RBUF_LEN 256
-static struct timeval lasttv = {0, 0};
+static ktime_t lastkt;
static struct lirc_buffer rbuf;
@@ -542,10 +542,10 @@ static void frbwrite(int l)
static irqreturn_t lirc_irq_handler(int i, void *blah)
{
- struct timeval tv;
+ ktime_t kt;
int counter, dcd;
u8 status;
- long deltv;
+ ktime_t delkt;
int data;
static int last_dcd = -1;
@@ -565,7 +565,7 @@ static irqreturn_t lirc_irq_handler(int i, void *blah)
if ((status & hardware[type].signal_pin_change)
&& sense != -1) {
/* get current time */
- do_gettimeofday(&tv);
+ kt = ktime_get();
/* New mode, written by Trent Piepho
<xyzzy@u.washington.edu>. */
@@ -594,34 +594,20 @@ static irqreturn_t lirc_irq_handler(int i, void *blah)
dcd = (status & hardware[type].signal_pin) ? 1 : 0;
if (dcd == last_dcd) {
- pr_warn("ignoring spike: %d %d %lx %lx %lx %lx\n",
- dcd, sense,
- tv.tv_sec, lasttv.tv_sec,
- (unsigned long)tv.tv_usec,
- (unsigned long)lasttv.tv_usec);
+ pr_warn("ignoring spike: %d %d %llx %llx\n",
+ dcd, sense, ktime_to_us(kt),
+ ktime_to_us(lastkt));
continue;
}
- deltv = tv.tv_sec-lasttv.tv_sec;
- if (tv.tv_sec < lasttv.tv_sec ||
- (tv.tv_sec == lasttv.tv_sec &&
- tv.tv_usec < lasttv.tv_usec)) {
- pr_warn("AIEEEE: your clock just jumped backwards\n");
- pr_warn("%d %d %lx %lx %lx %lx\n",
- dcd, sense,
- tv.tv_sec, lasttv.tv_sec,
- (unsigned long)tv.tv_usec,
- (unsigned long)lasttv.tv_usec);
- data = PULSE_MASK;
- } else if (deltv > 15) {
+ delkt = ktime_sub(kt, lastkt);
+ if (ktime_compare(delkt, ktime_set(15, 0)) > 0) {
data = PULSE_MASK; /* really long time */
if (!(dcd^sense)) {
/* sanity check */
- pr_warn("AIEEEE: %d %d %lx %lx %lx %lx\n",
- dcd, sense,
- tv.tv_sec, lasttv.tv_sec,
- (unsigned long)tv.tv_usec,
- (unsigned long)lasttv.tv_usec);
+ pr_warn("AIEEEE: %d %d %llx %llx\n",
+ dcd, sense, ktime_to_us(kt),
+ ktime_to_us(lastkt));
/*
* detecting pulse while this
* MUST be a space!
@@ -629,11 +615,9 @@ static irqreturn_t lirc_irq_handler(int i, void *blah)
sense = sense ? 0 : 1;
}
} else
- data = (int) (deltv*1000000 +
- tv.tv_usec -
- lasttv.tv_usec);
+ data = (int) ktime_to_us(delkt);
frbwrite(dcd^sense ? data : (data|PULSE_BIT));
- lasttv = tv;
+ lastkt = kt;
last_dcd = dcd;
wake_up_interruptible(&rbuf.wait_poll);
}
@@ -790,7 +774,7 @@ static int set_use_inc(void *data)
unsigned long flags;
/* initialize timestamp */
- do_gettimeofday(&lasttv);
+ lastkt = ktime_get();
spin_lock_irqsave(&hardware[type].lock, flags);
@@ -979,7 +963,7 @@ static int lirc_serial_resume(struct platform_device *dev)
spin_lock_irqsave(&hardware[type].lock, flags);
/* Enable Interrupt */
- do_gettimeofday(&lasttv);
+ lastkt = ktime_get();
soutp(UART_IER, sinp(UART_IER)|UART_IER_MSI);
off();

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