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Commit fce4b371 authored by Sean Young's avatar Sean Young Committed by Mauro Carvalho Chehab
Browse files

media: serial_ir: fix tx timing calculation on 32-bit 



Move the calculation to where it is needed, so the result doesn't
need to be stored in the device struct.

Signed-off-by: default avatarSean Young <sean@mess.org>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@s-opensource.com>
parent 766cbb31

drivers/media/rc/serial_ir.c

+14 −20
Original line number Diff line number Diff line
@@ -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;

}