1 /* uart_h5.c - UART based Bluetooth driver */
4  * Copyright (c) 2015-2016 Intel Corporation
6  * SPDX-License-Identifier: Apache-2.0
73 #define H5_TX_ACK_PEND	2
80 #define H5_HDR_LEN(hdr)		((((hdr)[1] >> 4) & 0x0f) + ((hdr)[2] << 4))
87 				 ((hdr)[2] |= (len) >> 4))
120 /* Third byte may change */
126 #define SIGNAL_COUNT	2
142 static int h5_unslip_byte(uint8_t *byte)  in h5_unslip_byte()  argument
146 	if (*byte != SLIP_ESC) {  in h5_unslip_byte()
151 		count = uart_fifo_read(h5_dev, byte, sizeof(*byte));  in h5_unslip_byte()
154 	switch (*byte) {  in h5_unslip_byte()
156 		*byte = SLIP_DELIMITER;  in h5_unslip_byte()
159 		*byte = SLIP_ESC;  in h5_unslip_byte()
162 		LOG_ERR("Invalid escape byte %x\n", *byte);  in h5_unslip_byte()
163 		return -EIO;  in h5_unslip_byte()
189 		number_removed--;  in process_unack()
190 		/* Similar to (n - 1) % 8 with unsigned conversion */  in process_unack()
191 		next_seq = (next_seq - 1) & 0x07;  in process_unack()
213 		unack_queue_len--;  in process_unack()
214 		number_removed--;  in process_unack()
235 		printk("%s zero-length signal packet\n", str);  in hexdump()
239 	while (length--) {  in hexdump()
264 static uint8_t h5_slip_byte(uint8_t byte)  in h5_slip_byte()  argument
266 	switch (byte) {  in h5_slip_byte()
270 		return 2;  in h5_slip_byte()
274 		return 2;  in h5_slip_byte()
276 		uart_poll_out(h5_dev, byte);  in h5_slip_byte()
305 	hdr[3] = ~((hdr[0] + hdr[1] + hdr[2]) & 0xff);  in h5_send()
345 			h5.tx_seq = (h5.tx_seq - 1) & 0x07;  in retx_timeout()
346 			unack_queue_len--;  in retx_timeout()
398 		hexdump("=> ", buf->data, buf->len);  in h5_process_complete_packet()
412 	uint8_t byte;  in bt_uart_isr()  local
429 			/* Only the UART RX path is interrupt-enabled */  in bt_uart_isr()
433 		ret = uart_fifo_read(h5_dev, &byte, sizeof(byte));  in bt_uart_isr()
440 			if (byte == SLIP_DELIMITER) {  in bt_uart_isr()
449 			if (byte == SLIP_DELIMITER) {  in bt_uart_isr()
454 			if (h5_unslip_byte(&byte) < 0) {  in bt_uart_isr()
459 			memcpy(&hdr[sizeof(hdr) - remaining], &byte, 1);  in bt_uart_isr()
460 			remaining--;  in bt_uart_isr()
518 			if (h5_unslip_byte(&byte) < 0) {  in bt_uart_isr()
527 				h5.rx_buf = get_evt_buf(byte);  in bt_uart_isr()
536 			if (buf_tailroom < sizeof(byte)) {  in bt_uart_isr()
537 				LOG_ERR("Not enough space in buffer %zu/%zu", sizeof(byte),  in bt_uart_isr()
543 			net_buf_add_mem(h5.rx_buf, &byte, sizeof(byte));  in bt_uart_isr()
544 			remaining--;  in bt_uart_isr()
550 			if (byte != SLIP_DELIMITER) {  in bt_uart_isr()
586 	LOG_DBG("buf %p type %u len %u", buf, bt_buf_get_type(buf), buf->len);  in h5_queue()
600 		return -1;  in h5_queue()
636 			h5_send(buf->data, type, buf->len);  in tx_thread()
653 	conf[2] = h5.tx_win & 0x07;  in h5_set_txwin()
665 		hexdump("=> ", buf->data, buf->len);  in rx_thread()
667 		if (!memcmp(buf->data, sync_req, sizeof(sync_req))) {  in rx_thread()
673 		} else if (!memcmp(buf->data, sync_rsp, sizeof(sync_rsp))) {  in rx_thread()
681 		} else if (!memcmp(buf->data, conf_req, 2)) {  in rx_thread()
691 		} else if (!memcmp(buf->data, conf_rsp, 2)) {  in rx_thread()
693 			if (buf->len > 2) {  in rx_thread()
695 				h5.tx_win = (buf->data[2] & 0x07);  in rx_thread()
700 			LOG_ERR("Not handled yet %x %x", buf->data[0], buf->data[1]);  in rx_thread()
774 		return -ENODEV;  in bt_uart_init()