5  * SPDX-License-Identifier: Apache-2.0
27 	struct modem_iface_uart_data *data = iface->iface_data;  in iface_uart_async_callback()
32 	switch (evt->type) {  in iface_uart_async_callback()
34 		k_sem_give(&data->tx_sem);  in iface_uart_async_callback()
37 		/* Allocate next RX buffer for UART driver */  in iface_uart_async_callback()
43 			LOG_ERR("RX buffer starvation");  in iface_uart_async_callback()
46 		/* Provide the buffer to the UART driver */  in iface_uart_async_callback()
51 		k_mem_slab_free(&uart_modem_async_rx_slab, (void *)evt->data.rx_buf.buf);  in iface_uart_async_callback()
54 		/* Place received data on the ring buffer */  in iface_uart_async_callback()
55 		written = ring_buf_put(&data->rx_rb,  in iface_uart_async_callback()
56 				       evt->data.rx.buf + evt->data.rx.offset,  in iface_uart_async_callback()
57 				       evt->data.rx.len);  in iface_uart_async_callback()
58 		if (written != evt->data.rx.len) {  in iface_uart_async_callback()
62 		k_sem_give(&data->rx_sem);  in iface_uart_async_callback()
67 		/* RX stopped (likely due to line error), re-enable it */  in iface_uart_async_callback()
70 			LOG_ERR("RX disabled and buffer starvation");  in iface_uart_async_callback()
76 			LOG_ERR("Failed to re-enable UART");  in iface_uart_async_callback()
89 	if (!iface || !iface->iface_data) {  in modem_iface_uart_async_read()
90 		return -EINVAL;  in modem_iface_uart_async_read()
98 	/* Pull data off the ring buffer */  in modem_iface_uart_async_read()
99 	data = iface->iface_data;  in modem_iface_uart_async_read()
100 	*bytes_read = ring_buf_get(&data->rx_rb, buf, size);  in modem_iface_uart_async_read()
110 	if (!iface || !iface->iface_data) {  in modem_iface_uart_async_write()
111 		return -EINVAL;  in modem_iface_uart_async_write()
119 	rc = uart_tx(iface->dev, buf, size, SYS_FOREVER_MS);  in modem_iface_uart_async_write()
122 		data = iface->iface_data;  in modem_iface_uart_async_write()
123 		k_sem_take(&data->tx_sem, K_FOREVER);  in modem_iface_uart_async_write()
136 		return -ENODEV;  in modem_iface_uart_init_dev()
143 	if (iface->dev) {  in modem_iface_uart_init_dev()
144 		LOG_WRN("Device %s already inited", iface->dev->name);  in modem_iface_uart_init_dev()
145 		uart_rx_disable(iface->dev);  in modem_iface_uart_init_dev()
148 	iface->dev = dev;  in modem_iface_uart_init_dev()
149 	data = iface->iface_data;  in modem_iface_uart_init_dev()
161 		LOG_ERR("Failed to enable UART RX");  in modem_iface_uart_init_dev()
167 			  const struct modem_iface_uart_config *config)  in modem_iface_uart_init()  argument
171 	if (iface == NULL || data == NULL || config == NULL) {  in modem_iface_uart_init()
172 		return -EINVAL;  in modem_iface_uart_init()
175 	iface->iface_data = data;  in modem_iface_uart_init()
176 	iface->read = modem_iface_uart_async_read;  in modem_iface_uart_init()
177 	iface->write = modem_iface_uart_async_write;  in modem_iface_uart_init()
179 	ring_buf_init(&data->rx_rb, config->rx_rb_buf_len, config->rx_rb_buf);  in modem_iface_uart_init()
180 	k_sem_init(&data->rx_sem, 0, 1);  in modem_iface_uart_init()
181 	k_sem_init(&data->tx_sem, 0, 1);  in modem_iface_uart_init()
184 	data->hw_flow_control = config->hw_flow_control;  in modem_iface_uart_init()
187 	ret = modem_iface_uart_init_dev(iface, config->dev);  in modem_iface_uart_init()
189 		iface->iface_data = NULL;  in modem_iface_uart_init()
190 		iface->read = NULL;  in modem_iface_uart_init()
191 		iface->write = NULL;  in modem_iface_uart_init()