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| author | Tomas Hlavacek <tmshlvck@gmail.com> | 2012-09-06 05:17:18 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-09-06 20:22:04 +0400 |
| commit | 6915c0e487c822e2436683e14302c0b8a6155cc7 (patch) | |
| tree | 3ef744c612c40517ed64d4f370a14c6c51eaab2f /drivers/tty/serial/serial_core.c | |
| parent | d83b54250988758cd3b9d21c242f98ae61fa1435 (diff) | |
| download | linux-6915c0e487c822e2436683e14302c0b8a6155cc7.tar.xz | |
tty: uartclk value from serial_core exposed to sysfs
Added file /sys/devices/.../tty/ttySX/uartclk to allow reading
uartclk value in struct uart_port in serial_core via sysfs.
tty_register_device() has been generalized and refactored in order
to add support for setting drvdata and attribute_group to the device.
Signed-off-by: Tomas Hlavacek <tmshlvck@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serial/serial_core.c')
| -rw-r--r-- | drivers/tty/serial/serial_core.c | 34 |
1 files changed, 32 insertions, 2 deletions
diff --git a/drivers/tty/serial/serial_core.c b/drivers/tty/serial/serial_core.c index 19993d89db37..f629bdf2a8cf 100644 --- a/drivers/tty/serial/serial_core.c +++ b/drivers/tty/serial/serial_core.c @@ -2309,6 +2309,36 @@ struct tty_driver *uart_console_device(struct console *co, int *index) return p->tty_driver; } +static ssize_t uart_get_attr_uartclk(struct device *dev, + struct device_attribute *attr, char *buf) +{ + int ret; + + struct tty_port *port = dev_get_drvdata(dev); + struct uart_state *state = container_of(port, struct uart_state, port); + mutex_lock(&state->port.mutex); + ret = snprintf(buf, PAGE_SIZE, "%d\n", state->uart_port->uartclk); + mutex_unlock(&state->port.mutex); + + return ret; +} + +static DEVICE_ATTR(uartclk, S_IRUSR | S_IRGRP, uart_get_attr_uartclk, NULL); + +static struct attribute *tty_dev_attrs[] = { + &dev_attr_uartclk.attr, + NULL, + }; + +static struct attribute_group tty_dev_attr_group = { + .attrs = tty_dev_attrs, + }; + +static const struct attribute_group *tty_dev_attr_groups[] = { + &tty_dev_attr_group, + NULL + }; + /** * uart_add_one_port - attach a driver-defined port structure * @drv: pointer to the uart low level driver structure for this port @@ -2362,8 +2392,8 @@ int uart_add_one_port(struct uart_driver *drv, struct uart_port *uport) * Register the port whether it's detected or not. This allows * setserial to be used to alter this ports parameters. */ - tty_dev = tty_port_register_device(port, drv->tty_driver, uport->line, - uport->dev); + tty_dev = tty_register_device_attr(drv->tty_driver, uport->line, + uport->dev, port, tty_dev_attr_groups); if (likely(!IS_ERR(tty_dev))) { device_set_wakeup_capable(tty_dev, 1); } else { |