4  * SPDX-License-Identifier: Apache-2.0
8  * @brief 1-Wire network related functions.
27  * This function searches the next 1-Wire slave on the bus.
28  * It sets the found ROM and the last discrepancy in case more than one
30  * In case only one slave took part in the search, the discrepancy is set to
36  * @see https://www.analog.com/media/en/technical-documentation/app-notes/1wire-search-algorithm.pdf
41  * their own addresses' bit. This allows the master to branch through 64-bit
47  * bytes (big-endian) stored in rom_inv_64 are in inverse byte order.
62  * @retval -errno Negative error code in case of 1-wire read/write error.
124 			     (*rom_inv_64 & BIT64(id_bit_nr - 1)))) {  in search_slave()
126 				 * - id_bit_nr > last_discrepancy:  in search_slave()
128 				 * - id_bit_nr < last_discrepancy:  in search_slave()
135 				 * - id_bit_nr == last_discrepancy:  in search_slave()
136 				 *     1-path already done, therefore go 0 path  in search_slave()
137 				 * - id_bit_nr < last_discrepancy:  in search_slave()
151 		*rom_inv_64 &= ~BIT64(id_bit_nr - 1);  in search_slave()
152 		*rom_inv_64 |= last_id_bit ? BIT64(id_bit_nr - 1) : 0;  in search_slave()
185 		 * Only big-endian targets need to swap, such that struct's  in z_impl_w1_search_bus()
186 		 * bytes are stored in big-endian byte order.  in z_impl_w1_search_bus()
213 		ret = -ENODEV;  in w1_read_rom()
229 		ret = -EIO;  in w1_read_rom()
242 	if (!config->overdrive) {  in match_rom()
244 			return -EIO;  in match_rom()
250 		return -ENODEV;  in match_rom()
256 	cmd = config->overdrive ? W1_CMD_OVERDRIVE_MATCH_ROM : W1_CMD_MATCH_ROM;  in match_rom()
261 	ret = w1_write_block(dev, (uint8_t *)&config->rom, 8);  in match_rom()
266 	if (config->overdrive) {  in match_rom()
268 			return -EIO;  in match_rom()
292 		ret = -ENODEV;  in w1_resume_command()
310 	if (!config->overdrive) {  in skip_rom()
312 			return -EIO;  in skip_rom()
318 		return -ENODEV;  in skip_rom()
324 	cmd = config->overdrive ? W1_CMD_OVERDRIVE_SKIP_ROM : W1_CMD_SKIP_ROM;  in skip_rom()
330 	if (config->overdrive) {  in skip_rom()
332 			return -EIO;  in skip_rom()
385 		return -EIO;  in write_read()