From 6915c0e487c822e2436683e14302c0b8a6155cc7 Mon Sep 17 00:00:00 2001 From: Tomas Hlavacek Date: Thu, 6 Sep 2012 03:17:18 +0200 Subject: 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 Signed-off-by: Greg Kroah-Hartman --- drivers/tty/tty_io.c | 69 ++++++++++++++++++++++++++++++++++++++++++++-------- 1 file changed, 59 insertions(+), 10 deletions(-) (limited to 'drivers/tty/tty_io.c') diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c index d3bf91a29303..dcb30d55d39c 100644 --- a/drivers/tty/tty_io.c +++ b/drivers/tty/tty_io.c @@ -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 -- cgit v1.2.3