Pull output-switch into test branch
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Len Brown
commit
274ec7a8c0
3 changed files with 205 additions and 0 deletions
34
Documentation/video-output.txt
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34
Documentation/video-output.txt
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Video Output Switcher Control
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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2006 luming.yu@intel.com
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The output sysfs class driver provides an abstract video output layer that
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can be used to hook platform specific methods to enable/disable video output
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device through common sysfs interface. For example, on my IBM ThinkPad T42
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laptop, The ACPI video driver registered its output devices and read/write
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method for 'state' with output sysfs class. The user interface under sysfs is:
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linux:/sys/class/video_output # tree .
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.
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|-- CRT0
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| |-- device -> ../../../devices/pci0000:00/0000:00:01.0
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| |-- state
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| |-- subsystem -> ../../../class/video_output
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| `-- uevent
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|-- DVI0
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| |-- device -> ../../../devices/pci0000:00/0000:00:01.0
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| |-- state
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| |-- subsystem -> ../../../class/video_output
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| `-- uevent
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|-- LCD0
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| |-- device -> ../../../devices/pci0000:00/0000:00:01.0
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| |-- state
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| |-- subsystem -> ../../../class/video_output
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| `-- uevent
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`-- TV0
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|-- device -> ../../../devices/pci0000:00/0000:00:01.0
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|-- state
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|-- subsystem -> ../../../class/video_output
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`-- uevent
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129
drivers/video/output.c
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129
drivers/video/output.c
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/*
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* output.c - Display Output Switch driver
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*
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* Copyright (C) 2006 Luming Yu <luming.yu@intel.com>
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*/
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#include <linux/module.h>
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#include <linux/video_output.h>
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#include <linux/err.h>
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#include <linux/ctype.h>
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MODULE_DESCRIPTION("Display Output Switcher Lowlevel Control Abstraction");
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Luming Yu <luming.yu@intel.com>");
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static ssize_t video_output_show_state(struct class_device *dev,char *buf)
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{
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ssize_t ret_size = 0;
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struct output_device *od = to_output_device(dev);
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if (od->props)
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ret_size = sprintf(buf,"%.8x\n",od->props->get_status(od));
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return ret_size;
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}
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static ssize_t video_output_store_state(struct class_device *dev,
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const char *buf,size_t count)
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{
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char *endp;
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struct output_device *od = to_output_device(dev);
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int request_state = simple_strtoul(buf,&endp,0);
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size_t size = endp - buf;
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if (*endp && isspace(*endp))
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size++;
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if (size != count)
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return -EINVAL;
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if (od->props) {
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od->request_state = request_state;
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od->props->set_state(od);
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}
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return count;
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}
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static void video_output_class_release(struct class_device *dev)
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{
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struct output_device *od = to_output_device(dev);
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kfree(od);
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}
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static struct class_device_attribute video_output_attributes[] = {
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__ATTR(state, 0644, video_output_show_state, video_output_store_state),
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__ATTR_NULL,
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};
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static struct class video_output_class = {
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.name = "video_output",
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.release = video_output_class_release,
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.class_dev_attrs = video_output_attributes,
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};
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struct output_device *video_output_register(const char *name,
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struct device *dev,
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void *devdata,
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struct output_properties *op)
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{
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struct output_device *new_dev;
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int ret_code = 0;
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new_dev = kzalloc(sizeof(struct output_device),GFP_KERNEL);
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if (!new_dev) {
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ret_code = -ENOMEM;
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goto error_return;
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}
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new_dev->props = op;
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new_dev->class_dev.class = &video_output_class;
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new_dev->class_dev.dev = dev;
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strlcpy(new_dev->class_dev.class_id,name,KOBJ_NAME_LEN);
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class_set_devdata(&new_dev->class_dev,devdata);
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ret_code = class_device_register(&new_dev->class_dev);
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if (ret_code) {
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kfree(new_dev);
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goto error_return;
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}
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return new_dev;
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error_return:
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return ERR_PTR(ret_code);
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}
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EXPORT_SYMBOL(video_output_register);
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void video_output_unregister(struct output_device *dev)
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{
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if (!dev)
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return;
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class_device_unregister(&dev->class_dev);
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}
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EXPORT_SYMBOL(video_output_unregister);
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static void __exit video_output_class_exit(void)
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{
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class_unregister(&video_output_class);
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}
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static int __init video_output_class_init(void)
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{
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return class_register(&video_output_class);
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}
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postcore_initcall(video_output_class_init);
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module_exit(video_output_class_exit);
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42
include/linux/video_output.h
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42
include/linux/video_output.h
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/*
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*
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* Copyright (C) 2006 Luming Yu <luming.yu@intel.com>
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*/
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#ifndef _LINUX_VIDEO_OUTPUT_H
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#define _LINUX_VIDEO_OUTPUT_H
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#include <linux/device.h>
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struct output_device;
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struct output_properties {
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int (*set_state)(struct output_device *);
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int (*get_status)(struct output_device *);
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};
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struct output_device {
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int request_state;
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struct output_properties *props;
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struct class_device class_dev;
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};
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#define to_output_device(obj) container_of(obj, struct output_device, class_dev)
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struct output_device *video_output_register(const char *name,
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struct device *dev,
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void *devdata,
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struct output_properties *op);
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void video_output_unregister(struct output_device *dev);
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#endif
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