Commit 1c087015 authored by Bryan O'Donoghue's avatar Bryan O'Donoghue Committed by Greg Kroah-Hartman
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greybus: uart: Add gb_uart_request_recv for receiving async UART data 



gb_uart_request_recv job in life is to process unsolicited greybus
mesages from the UART.
Hook the incoming UART data and pass to the TTY layer.
Line-state changes still TBD.

Signed-off-by: default avatarBryan O'Donoghue <bryan.odonoghue@linaro.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@google.com>
parent dd1c64ed

drivers/staging/greybus/uart.c

+42 −1
Original line number Diff line number Diff line
@@ -70,6 +70,47 @@ static atomic_t reference_count = ATOMIC_INIT(0); 
/* Define get_version() routine */

define_get_version(gb_tty, UART);



static int gb_uart_request_recv(u8 type, struct gb_operation *op)

{

	struct gb_connection *connection = op->connection;

	struct gb_tty *gb_tty = connection->private;

	struct gb_message *request = op->request;

	struct gb_uart_recv_data_request *receive_data;

	struct gb_uart_serial_state_request *serial_state;

	struct tty_port *port = &gb_tty->port;

	int count;

	int ret = 0;



	switch (type) {

	case GB_UART_TYPE_RECEIVE_DATA:

		receive_data = request->payload;

		count = gb_tty->buffer_payload_max - sizeof(*receive_data);

		if (!receive_data->size || receive_data->size > count)

			return -EINVAL;



		count = tty_insert_flip_string(port, receive_data->data,

					       receive_data->size);

		if (count != receive_data->size) {

			dev_err(&connection->dev,

				"UART: RX 0x%08x bytes only wrote 0x%08x\n",

				receive_data->size, count);

		}

		if (count)

			tty_flip_buffer_push(port);

		break;

	case GB_UART_TYPE_SERIAL_STATE:

		serial_state = request->payload;

		/* TODO: Parse state change and translate to tty API. */

		break;

	default:

		dev_err(&connection->dev,

			"unsupported unsolicited request: %02x\n", type);

		ret = -EINVAL;

	}



	return ret;

}



static int send_data(struct gb_tty *tty, u16 size, const u8 *data)

{

	struct gb_uart_send_data_request *request;
@@ -703,7 +744,7 @@ static struct gb_protocol uart_protocol = { 
	.minor			= 1,

	.connection_init	= gb_uart_connection_init,

	.connection_exit	= gb_uart_connection_exit,

	.request_recv		= NULL,	/* FIXME we have 2 types of requests!!! */

	.request_recv		= gb_uart_request_recv,

};



gb_gpbridge_protocol_driver(uart_protocol);