5  * SPDX-License-Identifier: Apache-2.0
11 #define MAX149x6_READ  0
14 #define MAX149X6_GET_BIT(val, i) (0x1 & ((val) >> (i)))
26  * @param data - array of data to encode
27  * @param encode - action to be performed - true(encode), false(decode)
32 	uint8_t crc5_start = 0x1f;  in max149x6_crc()
33 	uint8_t crc5_poly = 0x15;  in max149x6_crc()
35 	uint8_t extra_byte = 0x00;  in max149x6_crc()
42 	 * https://www.analog.com/en/app-notes/how-to-program-the-max14906-quadchannel-  in max149x6_crc()
43 	 *					industrial-digital-output-digital-input.html  in max149x6_crc()
46 	for (i = (encode) ? 0 : 2; i < 8; i++) {  in max149x6_crc()
47 		data_bit = (data[0] >> (7 - i)) & 0x01;  in max149x6_crc()
48 		result_bit = (crc5_result & 0x10) >> 4;  in max149x6_crc()
50 			crc5_result = crc5_poly ^ ((crc5_result << 1) & 0x1f);  in max149x6_crc()
52 			crc5_result = (crc5_result << 1) & 0x1f;  in max149x6_crc()
56 	for (i = 0; i < 8; i++) {  in max149x6_crc()
57 		data_bit = (data[1] >> (7 - i)) & 0x01;  in max149x6_crc()
58 		result_bit = (crc5_result & 0x10) >> 4;  in max149x6_crc()
60 			crc5_result = crc5_poly ^ ((crc5_result << 1) & 0x1f);  in max149x6_crc()
62 			crc5_result = (crc5_result << 1) & 0x1f;  in max149x6_crc()
66 	for (i = 0; i < 3; i++) {  in max149x6_crc()
67 		data_bit = (extra_byte >> (7 - i)) & 0x01;  in max149x6_crc()
68 		result_bit = (crc5_result & 0x10) >> 4;  in max149x6_crc()
70 			crc5_result = crc5_poly ^ ((crc5_result << 1) & 0x1f);  in max149x6_crc()
72 			crc5_result = (crc5_result << 1) & 0x1f;  in max149x6_crc()
82  * @param dev - MAX149x6 device config.
83  * @param addr - Register value to which data is written.
84  * @param val - Value which is to be written to requested register.
85  * @return 0 in case of success, negative error code otherwise.
93 	uint8_t local_rx_buff[MAX149x6_MAX_PKT_SIZE] = {0};  in max149x6_reg_transceive()
94 	uint8_t local_tx_buff[MAX149x6_MAX_PKT_SIZE] = {0};  in max149x6_reg_transceive()
96 	const struct max149x6_config *config = dev->config;  in max149x6_reg_transceive()
100 		.len = config->pkt_size,  in max149x6_reg_transceive()
106 		.len = config->pkt_size,  in max149x6_reg_transceive()
110 	if (config->crc_en & 0) {  in max149x6_reg_transceive()
114 	local_tx_buff[0] = FIELD_PREP(MAX149x6_ADDR_MASK, addr) |  in max149x6_reg_transceive()
115 			   FIELD_PREP(MAX149x6_CHIP_ADDR_MASK, config->spi_addr) |  in max149x6_reg_transceive()
116 			   FIELD_PREP(MAX149x6_RW_MASK, rw & 0x1);  in max149x6_reg_transceive()
120 	if (config->crc_en) {  in max149x6_reg_transceive()
121 		local_tx_buff[2] = max149x6_crc(&local_tx_buff[0], true);  in max149x6_reg_transceive()
125 	ret = spi_transceive_dt(&config->spi, &tx, &rx);  in max149x6_reg_transceive()
133 	if (config->crc_en) {  in max149x6_reg_transceive()
134 		crc = max149x6_crc(&local_rx_buff[0], false);  in max149x6_reg_transceive()
135 		if (crc != (local_rx_buff[2] & 0x1F)) {  in max149x6_reg_transceive()
136 			LOG_ERR("READ CRC ERR (%d)-(%d)\n", crc, (local_rx_buff[2] & 0x1F));  in max149x6_reg_transceive()
137 			return -EINVAL;  in max149x6_reg_transceive()
142 		rx_diag_buff[0] = local_rx_buff[0];  in max149x6_reg_transceive()
145 	/* In case of write we are getting 2 diagnostic bytes - byte0 & byte1  in max149x6_reg_transceive()