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greybus: uart: Add gb_uart_request_recv for receiving async UART data

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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: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
This commit is contained in:
Bryan O'Donoghue 2015-06-02 13:40:50 +01:00 committed by Greg Kroah-Hartman
parent dd1c64ede9
commit 1c087015b9
1 changed files with 42 additions and 1 deletions
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43
drivers/staging/greybus/uart.c
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@ -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);