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drivers: entropy: gecko: Implement ISR specific get entropy call

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Add the get_entropy_isr API function for the gecko entropy
driver. When the function is invoked without the ENTROPY_BUSYWAIT
flag, it returns whatever data is available in a non-blocking manner.

Signed-off-by: Pooja Karanjekar <pooja.karanjekar@lemonbeat.com>
This commit is contained in:
Pooja Karanjekar 2020-03-20 15:59:02 +01:00 • committed by Ioannis Glaropoulos
commit 558b904d80
1 changed files with 31 additions and 1 deletions
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32
drivers/entropy/entropy_gecko_trng.c
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@ -51,6 +51,35 @@ static int entropy_gecko_trng_get_entropy(struct device *dev, u8_t *buffer,
return 0; return 0;
} }
static int entropy_gecko_trng_get_entropy_isr(struct device *dev, u8_t *buf,
u16_t len, u32_t flags)
{
if ((flags & ENTROPY_BUSYWAIT) == 0U) {
/* No busy wait; return whatever data is available. */
size_t count;
size_t available = TRNG0->FIFOLEVEL * 4;
if (available == 0) {
return -ENODATA;
}
count = SL_MIN(len, available);
entropy_gecko_trng_read(buf, count);
return count;
} else {
/* Allowed to busy-wait */
int ret = entropy_gecko_trng_get_entropy(dev, buf, len);
if (ret == 0) {
/* Data retrieved successfully. */
return len;
}
return ret;
}
}
static int entropy_gecko_trng_init(struct device *device) static int entropy_gecko_trng_init(struct device *device)
{ {
/* Enable the TRNG0 clock. */ /* Enable the TRNG0 clock. */
@ -62,7 +91,8 @@ static int entropy_gecko_trng_init(struct device *device)
} }
static struct entropy_driver_api entropy_gecko_trng_api_funcs = { static struct entropy_driver_api entropy_gecko_trng_api_funcs = {
.get_entropy = entropy_gecko_trng_get_entropy .get_entropy = entropy_gecko_trng_get_entropy,
.get_entropy_isr = entropy_gecko_trng_get_entropy_isr
}; };
DEVICE_AND_API_INIT(entropy_gecko_trng, CONFIG_ENTROPY_NAME, DEVICE_AND_API_INIT(entropy_gecko_trng, CONFIG_ENTROPY_NAME,