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media: gpio-ir-tx: allow transmission without carrier

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Some IR protocols do not use a carrier.

Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Sean Young 2020-05-06 11:54:39 +02:00 committed by Mauro Carvalho Chehab
parent ea8912b788
commit 1195a28dcf
1 changed files with 40 additions and 4 deletions
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44
drivers/media/rc/gpio-ir-tx.c
View file

@ -42,7 +42,7 @@ static int gpio_ir_tx_set_carrier(struct rc_dev *dev, u32 carrier)
{
struct gpio_ir *gpio_ir = dev->priv;
if (!carrier)
if (carrier > 500000)
return -EINVAL;
gpio_ir->carrier = carrier;
@ -50,10 +50,35 @@ static int gpio_ir_tx_set_carrier(struct rc_dev *dev, u32 carrier)
return 0;
}
static int gpio_ir_tx(struct rc_dev *dev, unsigned int *txbuf,
unsigned int count)
static void gpio_ir_tx_unmodulated(struct gpio_ir *gpio_ir, uint *txbuf,
uint count)
{
unsigned long flags;
ktime_t edge;
s32 delta;
int i;
spin_lock_irqsave(&gpio_ir->lock, flags);
edge = ktime_get();
for (i = 0; i < count; i++) {
gpiod_set_value(gpio_ir->gpio, !(i % 2));
edge = ktime_add_us(edge, txbuf[i]);
delta = ktime_us_delta(edge, ktime_get());
if (delta > 0)
udelay(delta);
}
gpiod_set_value(gpio_ir->gpio, 0);
spin_unlock_irqrestore(&gpio_ir->lock, flags);
}
static void gpio_ir_tx_modulated(struct gpio_ir *gpio_ir, uint *txbuf,
uint count)
{
struct gpio_ir *gpio_ir = dev->priv;
unsigned long flags;
ktime_t edge;
/*
@ -105,6 +130,17 @@ static int gpio_ir_tx(struct rc_dev *dev, unsigned int *txbuf,
}
spin_unlock_irqrestore(&gpio_ir->lock, flags);
}
static int gpio_ir_tx(struct rc_dev *dev, unsigned int *txbuf,
unsigned int count)
{
struct gpio_ir *gpio_ir = dev->priv;
if (gpio_ir->carrier)
gpio_ir_tx_modulated(gpio_ir, txbuf, count);
else
gpio_ir_tx_unmodulated(gpio_ir, txbuf, count);
return count;
}