diff options
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/serial/atmel_serial.c | 35 |
1 files changed, 34 insertions, 1 deletions
diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c index b30c93f80899..c0e724633fe3 100644 --- a/drivers/tty/serial/atmel_serial.c +++ b/drivers/tty/serial/atmel_serial.c @@ -2761,14 +2761,47 @@ err: return ret; } +/* + * Even if the driver is not modular, it makes sense to be able to + * unbind a device: there can be many bound devices, and there are + * situations where dynamic binding and unbinding can be useful. + * + * For example, a connected device can require a specific firmware update + * protocol that needs bitbanging on IO lines, but use the regular serial + * port in the normal case. + */ +static int atmel_serial_remove(struct platform_device *pdev) +{ + struct uart_port *port = platform_get_drvdata(pdev); + struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); + int ret = 0; + + tasklet_kill(&atmel_port->tasklet); + + device_init_wakeup(&pdev->dev, 0); + + ret = uart_remove_one_port(&atmel_uart, port); + + kfree(atmel_port->rx_ring.buf); + + /* "port" is allocated statically, so we shouldn't free it */ + + clear_bit(port->line, atmel_ports_in_use); + + clk_put(atmel_port->clk); + atmel_port->clk = NULL; + + return ret; +} + static struct platform_driver atmel_serial_driver = { .probe = atmel_serial_probe, + .remove = atmel_serial_remove, .suspend = atmel_serial_suspend, .resume = atmel_serial_resume, .driver = { .name = "atmel_usart", .of_match_table = of_match_ptr(atmel_serial_dt_ids), - .suppress_bind_attrs = true, }, }; |