133 lines
3.4 KiB
C
133 lines
3.4 KiB
C
/*
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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 device *dev,
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struct device_attribute *attr, 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 device *dev,
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struct device_attribute *attr,
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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 (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_release(struct 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 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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.dev_release = video_output_release,
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.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->dev.class = &video_output_class;
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new_dev->dev.parent = dev;
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dev_set_name(&new_dev->dev, name);
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dev_set_drvdata(&new_dev->dev, devdata);
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ret_code = device_register(&new_dev->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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device_unregister(&dev->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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