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| author |   Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com> | 2014-08-05 11:45:59 +0200 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-09-08 15:26:26 -0700 |
| commit | e676253b19b2d269cccf67fdb1592120a0cd0676 (patch) | |
| tree | 34618c8fbe8069d007fb2a38ff8b2679dc6a10ea | |
| parent | staging: dgnc: remove Neo card ids from device table (diff) | |
| download | wireguard-linux-e676253b19b2d269cccf67fdb1592120a0cd0676.tar.xz wireguard-linux-e676253b19b2d269cccf67fdb1592120a0cd0676.zip | |
serial/8250: Add support for RS485 IOCTLs
This patch allow the users of the 8250 infrastructure to define a
handler for RS485 configration.
If no handler is defined the 8250 driver will work as usual.
Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@gmail.com>
Acked-by: Alan Cox <alan@linux.intel.com>
--
v2:Change suggested by Alan "One Thousand Gnomes":
- Move rs485 structure further down on the uart_8250_port structure
drivers/tty/serial/8250/8250_core.c | 39 +++++++++++++++++++++++++++++++++++++
include/linux/serial_8250.h | 3 +++
2 files changed, 42 insertions(+)
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/tty/serial/8250/8250_core.c | 39 | ||||
| -rw-r--r-- | include/linux/serial_8250.h | 3 |
2 files changed, 42 insertions, 0 deletions
diff --git a/drivers/tty/serial/8250/8250_core.c b/drivers/tty/serial/8250/8250_core.c index 1d42dba6121d..b28ed1beb50f 100644 --- a/drivers/tty/serial/8250/8250_core.c +++ b/drivers/tty/serial/8250/8250_core.c @@ -2843,6 +2843,42 @@ serial8250_verify_port(struct uart_port *port, struct serial_struct *ser) return 0; } +static int serial8250_ioctl(struct uart_port *port, unsigned int cmd, + unsigned long arg) +{ + struct uart_8250_port *up = + container_of(port, struct uart_8250_port, port); + int ret; + struct serial_rs485 rs485_config; + + if (!up->rs485_config) + return -ENOIOCTLCMD; + + switch (cmd) { + case TIOCSRS485: + if (copy_from_user(&rs485_config, (void __user *)arg, + sizeof(rs485_config))) + return -EFAULT; + + ret = up->rs485_config(up, &rs485_config); + if (ret) + return ret; + + memcpy(&up->rs485, &rs485_config, sizeof(rs485_config)); + + return 0; + case TIOCGRS485: + if (copy_to_user((void __user *)arg, &up->rs485, + sizeof(up->rs485))) + return -EFAULT; + return 0; + default: + break; + } + + return -ENOIOCTLCMD; +} + static const char * serial8250_type(struct uart_port *port) { @@ -2872,6 +2908,7 @@ static struct uart_ops serial8250_pops = { .request_port = serial8250_request_port, .config_port = serial8250_config_port, .verify_port = serial8250_verify_port, + .ioctl = serial8250_ioctl, #ifdef CONFIG_CONSOLE_POLL .poll_get_char = serial8250_get_poll_char, .poll_put_char = serial8250_put_poll_char, @@ -3388,6 +3425,8 @@ int serial8250_register_8250_port(struct uart_8250_port *up) uart->port.fifosize = up->port.fifosize; uart->tx_loadsz = up->tx_loadsz; uart->capabilities = up->capabilities; + uart->rs485_config = up->rs485_config; + uart->rs485 = up->rs485; /* Take tx_loadsz from fifosize if it wasn't set separately */ if (uart->port.fifosize && !uart->tx_loadsz) diff --git a/include/linux/serial_8250.h b/include/linux/serial_8250.h index f93649e22c43..6dd671765312 100644 --- a/include/linux/serial_8250.h +++ b/include/linux/serial_8250.h @@ -96,10 +96,13 @@ struct uart_8250_port { unsigned char msr_saved_flags; struct uart_8250_dma *dma; + struct serial_rs485 rs485; /* 8250 specific callbacks */ int (*dl_read)(struct uart_8250_port *); void (*dl_write)(struct uart_8250_port *, int); + int (*rs485_config)(struct uart_8250_port *, + struct serial_rs485 *rs485); }; static inline struct uart_8250_port *up_to_u8250p(struct uart_port *up) |