1 /* 2 * Linux driver model AC97 bus interface 3 * 4 * Author: Nicolas Pitre 5 * Created: Jan 14, 2005 6 * Copyright: (C) MontaVista Software Inc. 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 */ 13 14 #include <linux/module.h> 15 #include <linux/init.h> 16 #include <linux/device.h> 17 #include <linux/string.h> 18 19 /* 20 * Let drivers decide whether they want to support given codec from their 21 * probe method. Drivers have direct access to the struct snd_ac97 structure and may 22 * decide based on the id field amongst other things. 23 */ 24 static int ac97_bus_match(struct device *dev, struct device_driver *drv) 25 { 26 return 1; 27 } 28 29 static int ac97_bus_suspend(struct device *dev, pm_message_t state) 30 { 31 int ret = 0; 32 33 if (dev->driver && dev->driver->suspend) 34 ret = dev->driver->suspend(dev, state); 35 36 return ret; 37 } 38 39 static int ac97_bus_resume(struct device *dev) 40 { 41 int ret = 0; 42 43 if (dev->driver && dev->driver->resume) 44 ret = dev->driver->resume(dev); 45 46 return ret; 47 } 48 49 struct bus_type ac97_bus_type = { 50 .name = "ac97", 51 .match = ac97_bus_match, 52 .suspend = ac97_bus_suspend, 53 .resume = ac97_bus_resume, 54 }; 55 56 static int __init ac97_bus_init(void) 57 { 58 return bus_register(&ac97_bus_type); 59 } 60 61 subsys_initcall(ac97_bus_init); 62 63 static void __exit ac97_bus_exit(void) 64 { 65 bus_unregister(&ac97_bus_type); 66 } 67 68 module_exit(ac97_bus_exit); 69 70 EXPORT_SYMBOL(ac97_bus_type); 71 72 MODULE_LICENSE("GPL"); 73