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 #ifdef CONFIG_PM 30 static int ac97_bus_suspend(struct device *dev, pm_message_t state) 31 { 32 int ret = 0; 33 34 if (dev->driver && dev->driver->suspend) 35 ret = dev->driver->suspend(dev, state); 36 37 return ret; 38 } 39 40 static int ac97_bus_resume(struct device *dev) 41 { 42 int ret = 0; 43 44 if (dev->driver && dev->driver->resume) 45 ret = dev->driver->resume(dev); 46 47 return ret; 48 } 49 #endif /* CONFIG_PM */ 50 51 struct bus_type ac97_bus_type = { 52 .name = "ac97", 53 .match = ac97_bus_match, 54 #ifdef CONFIG_PM 55 .suspend = ac97_bus_suspend, 56 .resume = ac97_bus_resume, 57 #endif /* CONFIG_PM */ 58 }; 59 60 static int __init ac97_bus_init(void) 61 { 62 return bus_register(&ac97_bus_type); 63 } 64 65 subsys_initcall(ac97_bus_init); 66 67 static void __exit ac97_bus_exit(void) 68 { 69 bus_unregister(&ac97_bus_type); 70 } 71 72 module_exit(ac97_bus_exit); 73 74 EXPORT_SYMBOL(ac97_bus_type); 75 76 MODULE_LICENSE("GPL"); 77