[3/3] media: serial_ir: fix tx timing calculation on 32-bit
Commit Message
Move the calculation to where it is needed, so the result doesn't
need to be stored in the device struct.
Signed-off-by: Sean Young <sean@mess.org>
---
drivers/media/rc/serial_ir.c | 34 ++++++++++++++--------------------
1 file changed, 14 insertions(+), 20 deletions(-)
@@ -139,10 +139,8 @@ struct serial_ir {
struct platform_device *pdev;
struct timer_list timeout_timer;
- unsigned int freq;
+ unsigned int carrier;
unsigned int duty_cycle;
-
- unsigned int pulse_width, space_width;
};
static struct serial_ir serial_ir;
@@ -183,18 +181,6 @@ static void off(void)
soutp(UART_MCR, hardware[type].off);
}
-static void init_timing_params(unsigned int new_duty_cycle,
- unsigned int new_freq)
-{
- serial_ir.duty_cycle = new_duty_cycle;
- serial_ir.freq = new_freq;
-
- serial_ir.pulse_width = DIV_ROUND_CLOSEST(
- new_duty_cycle * NSEC_PER_SEC, new_freq * 100l);
- serial_ir.space_width = DIV_ROUND_CLOSEST(
- (100l - new_duty_cycle) * NSEC_PER_SEC, new_freq * 100l);
-}
-
static void send_pulse_irdeo(unsigned int length, ktime_t target)
{
long rawbits;
@@ -241,13 +227,20 @@ static void send_pulse_homebrew_softcarrier(unsigned int length, ktime_t edge)
* ndelay(s64) does not compile; so use s32 rather than s64.
*/
s32 delta;
+ unsigned int pulse, space;
+
+ /* Ensure the dividend fits into 32 bit */
+ pulse = DIV_ROUND_CLOSEST(serial_ir.duty_cycle * (NSEC_PER_SEC / 100),
+ serial_ir.carrier);
+ space = DIV_ROUND_CLOSEST((100 - serial_ir.duty_cycle) *
+ (NSEC_PER_SEC / 100), serial_ir.carrier);
for (;;) {
now = ktime_get();
if (ktime_compare(now, target) >= 0)
break;
on();
- edge = ktime_add_ns(edge, serial_ir.pulse_width);
+ edge = ktime_add_ns(edge, pulse);
delta = ktime_to_ns(ktime_sub(edge, now));
if (delta > 0)
ndelay(delta);
@@ -255,7 +248,7 @@ static void send_pulse_homebrew_softcarrier(unsigned int length, ktime_t edge)
off();
if (ktime_compare(now, target) >= 0)
break;
- edge = ktime_add_ns(edge, serial_ir.space_width);
+ edge = ktime_add_ns(edge, space);
delta = ktime_to_ns(ktime_sub(edge, now));
if (delta > 0)
ndelay(delta);
@@ -580,7 +573,8 @@ static int serial_ir_probe(struct platform_device *dev)
return result;
/* Initialize pulse/space widths */
- init_timing_params(50, 38000);
+ serial_ir.duty_cycle = 50;
+ serial_ir.carrier = 38000;
/* If pin is high, then this must be an active low receiver. */
if (sense == -1) {
@@ -684,7 +678,7 @@ static int serial_ir_tx(struct rc_dev *dev, unsigned int *txbuf,
static int serial_ir_tx_duty_cycle(struct rc_dev *dev, u32 cycle)
{
- init_timing_params(cycle, serial_ir.freq);
+ serial_ir.duty_cycle = cycle;
return 0;
}
@@ -693,7 +687,7 @@ static int serial_ir_tx_carrier(struct rc_dev *dev, u32 carrier)
if (carrier > 500000 || carrier < 20000)
return -EINVAL;
- init_timing_params(serial_ir.duty_cycle, carrier);
+ serial_ir.carrier = carrier;
return 0;
}