C++ (Cpp) tegra_i2c_request Examples

Example #1

File: i2c.c Project: 0ida/coreboot

static int i2c_readwrite(unsigned bus, unsigned chip, unsigned addr,
			 unsigned alen, uint8_t *buf, unsigned len, int read)
{
	const uint32_t max_payload =
		(IOHEADER_PAYLOADSIZE_MASK + 1) >> IOHEADER_PAYLOADSIZE_SHIFT;
	uint8_t abuf[sizeof(addr)];

	int i;
	for (i = 0; i < alen; i++)
		abuf[i] = addr >> ((alen - i - 1) * 8);

	if (tegra_i2c_request(bus, chip, !read, 0, 0, abuf, alen))
		return -1;

	while (len) {
		int todo = MIN(len, max_payload);
		int cont = (todo < len);
		if (tegra_i2c_request(bus, chip, cont, 0, read, buf, todo)) {
			// We should reset the controller here.
			return -1;
		}
		len -= todo;
		buf += todo;
	}
	return 0;
}

Example #2

static int i2c_transfer_segment(unsigned bus, unsigned chip, int restart,
				int read, void *buf, int len)
{
	const uint32_t max_payload =
		(IOHEADER_PAYLOADSIZE_MASK + 1) >> IOHEADER_PAYLOADSIZE_SHIFT;

	while (len) {
		int todo = MIN(len, max_payload);
		int cont = (todo < len);
		if (tegra_i2c_request(bus, chip, cont, restart,
				      read, buf, todo))
			return -1;
		len -= todo;
		buf += todo;
	}
	return 0;
}