static ssize_t w1_slave_show()

in slaves/w1_therm.c [1525:1575]

• 43 lines of code
• 9 McCabe index (conditional complexity)

static ssize_t w1_slave_show(struct device *device,
			     struct device_attribute *attr, char *buf)
{
	struct w1_slave *sl = dev_to_w1_slave(device);
	struct therm_info info;
	u8 *family_data = sl->family_data;
	int ret, i;
	ssize_t c = PAGE_SIZE;

	if (bulk_read_support(sl)) {
		if (SLAVE_CONVERT_TRIGGERED(sl) < 0) {
			dev_dbg(device,
				"%s: Conversion in progress, retry later\n",
				__func__);
			return 0;
		} else if (SLAVE_CONVERT_TRIGGERED(sl) > 0) {
			/* A bulk read has been issued, read the device RAM */
			ret = read_scratchpad(sl, &info);
			SLAVE_CONVERT_TRIGGERED(sl) = 0;
		} else
			ret = convert_t(sl, &info);
	} else
		ret = convert_t(sl, &info);

	if (ret < 0) {
		dev_dbg(device,
			"%s: Temperature data may be corrupted. err=%d\n",
			__func__, ret);
		return 0;
	}

	for (i = 0; i < 9; ++i)
		c -= snprintf(buf + PAGE_SIZE - c, c, "%02x ", info.rom[i]);
	c -= snprintf(buf + PAGE_SIZE - c, c, ": crc=%02x %s\n",
		      info.crc, (info.verdict) ? "YES" : "NO");

	if (info.verdict)
		memcpy(family_data, info.rom, sizeof(info.rom));
	else
		dev_warn(device, "%s:Read failed CRC check\n", __func__);

	for (i = 0; i < 9; ++i)
		c -= snprintf(buf + PAGE_SIZE - c, c, "%02x ",
			      ((u8 *)family_data)[i]);

	c -= snprintf(buf + PAGE_SIZE - c, c, "t=%d\n",
			temperature_from_RAM(sl, info.rom));

	ret = PAGE_SIZE - c;
	return ret;
}