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- /*
- * output.c - Display Output Switch driver
- *
- * Copyright (C) 2006 Luming Yu <luming.yu@intel.com>
- *
- * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or (at
- * your option) any later version.
- *
- * 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.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
- *
- * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- */
- #include <linux/module.h>
- #include <linux/video_output.h>
- #include <linux/err.h>
- #include <linux/ctype.h>
- MODULE_DESCRIPTION("Display Output Switcher Lowlevel Control Abstraction");
- MODULE_LICENSE("GPL");
- MODULE_AUTHOR("Luming Yu <luming.yu@intel.com>");
- static ssize_t video_output_show_state(struct class_device *dev,char *buf)
- {
- ssize_t ret_size = 0;
- struct output_device *od = to_output_device(dev);
- if (od->props)
- ret_size = sprintf(buf,"%.8x\n",od->props->get_status(od));
- return ret_size;
- }
- static ssize_t video_output_store_state(struct class_device *dev,
- const char *buf,size_t count)
- {
- char *endp;
- struct output_device *od = to_output_device(dev);
- int request_state = simple_strtoul(buf,&endp,0);
- size_t size = endp - buf;
- if (*endp && isspace(*endp))
- size++;
- if (size != count)
- return -EINVAL;
- if (od->props) {
- od->request_state = request_state;
- od->props->set_state(od);
- }
- return count;
- }
- static void video_output_class_release(struct class_device *dev)
- {
- struct output_device *od = to_output_device(dev);
- kfree(od);
- }
- static struct class_device_attribute video_output_attributes[] = {
- __ATTR(state, 0644, video_output_show_state, video_output_store_state),
- __ATTR_NULL,
- };
- static struct class video_output_class = {
- .name = "video_output",
- .release = video_output_class_release,
- .class_dev_attrs = video_output_attributes,
- };
- struct output_device *video_output_register(const char *name,
- struct device *dev,
- void *devdata,
- struct output_properties *op)
- {
- struct output_device *new_dev;
- int ret_code = 0;
- new_dev = kzalloc(sizeof(struct output_device),GFP_KERNEL);
- if (!new_dev) {
- ret_code = -ENOMEM;
- goto error_return;
- }
- new_dev->props = op;
- new_dev->class_dev.class = &video_output_class;
- new_dev->class_dev.dev = dev;
- strlcpy(new_dev->class_dev.class_id,name,KOBJ_NAME_LEN);
- class_set_devdata(&new_dev->class_dev,devdata);
- ret_code = class_device_register(&new_dev->class_dev);
- if (ret_code) {
- kfree(new_dev);
- goto error_return;
- }
- return new_dev;
- error_return:
- return ERR_PTR(ret_code);
- }
- EXPORT_SYMBOL(video_output_register);
- void video_output_unregister(struct output_device *dev)
- {
- if (!dev)
- return;
- class_device_unregister(&dev->class_dev);
- }
- EXPORT_SYMBOL(video_output_unregister);
- static void __exit video_output_class_exit(void)
- {
- class_unregister(&video_output_class);
- }
- static int __init video_output_class_init(void)
- {
- return class_register(&video_output_class);
- }
- postcore_initcall(video_output_class_init);
- module_exit(video_output_class_exit);
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