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author | Linus Torvalds | 2012-01-09 21:18:17 +0100 |
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committer | Linus Torvalds | 2012-01-09 21:18:17 +0100 |
commit | 12e55508921865aefdd80fd17afe70c191afbd1b (patch) | |
tree | 476b3226fd9602b36bed0934409959bdd24a7eb5 /drivers/staging/android/timed_output.c | |
parent | Merge branch 'usb-next' of git://git.kernel.org/pub/scm/linux/kernel/git/greg... (diff) | |
parent | net/hyperv: Add support for jumbo frame up to 64KB (diff) | |
download | kernel-qcow2-linux-12e55508921865aefdd80fd17afe70c191afbd1b.tar.gz kernel-qcow2-linux-12e55508921865aefdd80fd17afe70c191afbd1b.tar.xz kernel-qcow2-linux-12e55508921865aefdd80fd17afe70c191afbd1b.zip |
Merge branch 'staging-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging
* 'staging-next' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging: (466 commits)
net/hyperv: Add support for jumbo frame up to 64KB
net/hyperv: Add NETVSP protocol version negotiation
net/hyperv: Remove unnecessary kmap_atomic in netvsc driver
staging/rtl8192e: Register against lib80211
staging/rtl8192e: Convert to lib80211_crypt_info
staging/rtl8192e: Convert to lib80211_crypt_data and lib80211_crypt_ops
staging/rtl8192e: Add lib80211.h to rtllib.h
staging/mei: add watchdog device registration wrappers
drm/omap: GEM, deal with cache
staging: vt6656: int.c, int.h: Change return of function to void
staging: usbip: removed unused definitions from header
staging: usbip: removed dead code from receive function
staging:iio: Drop {mark,unmark}_in_use callbacks
staging:iio: Drop buffer mark_param_change callback
staging:iio: Drop the unused buffer enable() and is_enabled() callbacks
staging:iio: Drop buffer busy flag
staging:iio: Make sure a device is only opened once at a time
staging:iio: Disallow modifying buffer size when buffer is enabled
staging:iio: Disallow changing scan elements in all buffered modes
staging:iio: Use iio_buffer_enabled instead of open coding it
...
Fix up conflict in drivers/staging/iio/adc/ad799x_core.c (removal of
module_init due to using module_i2c_driver() helper, next to removal of
MODULE_ALIAS due to using MODULE_DEVICE_TABLE instead).
Diffstat (limited to 'drivers/staging/android/timed_output.c')
-rw-r--r-- | drivers/staging/android/timed_output.c | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/drivers/staging/android/timed_output.c b/drivers/staging/android/timed_output.c new file mode 100644 index 000000000000..f373422308e0 --- /dev/null +++ b/drivers/staging/android/timed_output.c @@ -0,0 +1,123 @@ +/* drivers/misc/timed_output.c + * + * Copyright (C) 2009 Google, Inc. + * Author: Mike Lockwood <lockwood@android.com> + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + */ + +#include <linux/module.h> +#include <linux/types.h> +#include <linux/device.h> +#include <linux/fs.h> +#include <linux/err.h> + +#include "timed_output.h" + +static struct class *timed_output_class; +static atomic_t device_count; + +static ssize_t enable_show(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct timed_output_dev *tdev = dev_get_drvdata(dev); + int remaining = tdev->get_time(tdev); + + return sprintf(buf, "%d\n", remaining); +} + +static ssize_t enable_store( + struct device *dev, struct device_attribute *attr, + const char *buf, size_t size) +{ + struct timed_output_dev *tdev = dev_get_drvdata(dev); + int value; + + if (sscanf(buf, "%d", &value) != 1) + return -EINVAL; + + tdev->enable(tdev, value); + + return size; +} + +static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, enable_show, enable_store); + +static int create_timed_output_class(void) +{ + if (!timed_output_class) { + timed_output_class = class_create(THIS_MODULE, "timed_output"); + if (IS_ERR(timed_output_class)) + return PTR_ERR(timed_output_class); + atomic_set(&device_count, 0); + } + + return 0; +} + +int timed_output_dev_register(struct timed_output_dev *tdev) +{ + int ret; + + if (!tdev || !tdev->name || !tdev->enable || !tdev->get_time) + return -EINVAL; + + ret = create_timed_output_class(); + if (ret < 0) + return ret; + + tdev->index = atomic_inc_return(&device_count); + tdev->dev = device_create(timed_output_class, NULL, + MKDEV(0, tdev->index), NULL, tdev->name); + if (IS_ERR(tdev->dev)) + return PTR_ERR(tdev->dev); + + ret = device_create_file(tdev->dev, &dev_attr_enable); + if (ret < 0) + goto err_create_file; + + dev_set_drvdata(tdev->dev, tdev); + tdev->state = 0; + return 0; + +err_create_file: + device_destroy(timed_output_class, MKDEV(0, tdev->index)); + printk(KERN_ERR "timed_output: Failed to register driver %s\n", + tdev->name); + + return ret; +} +EXPORT_SYMBOL_GPL(timed_output_dev_register); + +void timed_output_dev_unregister(struct timed_output_dev *tdev) +{ + device_remove_file(tdev->dev, &dev_attr_enable); + device_destroy(timed_output_class, MKDEV(0, tdev->index)); + dev_set_drvdata(tdev->dev, NULL); +} +EXPORT_SYMBOL_GPL(timed_output_dev_unregister); + +static int __init timed_output_init(void) +{ + return create_timed_output_class(); +} + +static void __exit timed_output_exit(void) +{ + class_destroy(timed_output_class); +} + +module_init(timed_output_init); +module_exit(timed_output_exit); + +MODULE_AUTHOR("Mike Lockwood <lockwood@android.com>"); +MODULE_DESCRIPTION("timed output class driver"); +MODULE_LICENSE("GPL"); |