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tty: uartclk value from serial_core exposed to sysfs

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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>
This commit is contained in:
Tomas Hlavacek
2012-09-06 03:17:18 +02:00
committed by Greg Kroah-Hartman
parent d83b542509
commit 6915c0e487
4 changed files with 104 additions and 12 deletions
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69
drivers/tty/tty_io.c
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@@ -3041,9 +3041,39 @@ static int tty_cdev_add(struct tty_driver *driver, dev_t dev,
struct device *tty_register_device(struct tty_driver *driver, unsigned index,
struct device *device)
{
struct device *ret;
return tty_register_device_attr(driver, index, device, NULL, NULL);
}
EXPORT_SYMBOL(tty_register_device);
/**
* tty_register_device_attr - register a tty device
* @driver: the tty driver that describes the tty device
* @index: the index in the tty driver for this tty device
* @device: a struct device that is associated with this tty device.
* This field is optional, if there is no known struct device
* for this tty device it can be set to NULL safely.
* @drvdata: Driver data to be set to device.
* @attr_grp: Attribute group to be set on device.
*
* Returns a pointer to the struct device for this tty device
* (or ERR_PTR(-EFOO) on error).
*
* This call is required to be made to register an individual tty device
* if the tty driver's flags have the TTY_DRIVER_DYNAMIC_DEV bit set. If
* that bit is not set, this function should not be called by a tty
* driver.
*
* Locking: ??
*/
struct device *tty_register_device_attr(struct tty_driver *driver,
unsigned index, struct device *device,
void *drvdata,
const struct attribute_group **attr_grp)
{
char name[64];
dev_t dev = MKDEV(driver->major, driver->minor_start) + index;
dev_t devt = MKDEV(driver->major, driver->minor_start) + index;
struct device *dev = NULL;
int retval = -ENODEV;
bool cdev = false;
if (index >= driver->num) {
@@ -3058,19 +3088,38 @@ struct device *tty_register_device(struct tty_driver *driver, unsigned index,
tty_line_name(driver, index, name);
if (!(driver->flags & TTY_DRIVER_DYNAMIC_ALLOC)) {
int error = tty_cdev_add(driver, dev, index, 1);
if (error)
return ERR_PTR(error);
retval = tty_cdev_add(driver, devt, index, 1);
if (retval)
goto error;
cdev = true;
}
ret = device_create(tty_class, device, dev, NULL, name);
if (IS_ERR(ret) && cdev)
cdev_del(&driver->cdevs[index]);
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
if (!dev) {
retval = -ENOMEM;
goto error;
}
return ret;
dev->devt = devt;
dev->class = tty_class;
dev->parent = device;
dev_set_name(dev, "%s", name);
dev->groups = attr_grp;
dev_set_drvdata(dev, drvdata);
retval = device_register(dev);
if (retval)
goto error;
return dev;
error:
put_device(dev);
if (cdev)
cdev_del(&driver->cdevs[index]);
return ERR_PTR(retval);
}
EXPORT_SYMBOL(tty_register_device);
EXPORT_SYMBOL_GPL(tty_register_device_attr);
/**
* tty_unregister_device - unregister a tty device