1 /* 2 * Copyright (C) 2006 Benjamin Herrenschmidt, IBM Corp. 3 * <benh@kernel.crashing.org> 4 * and Arnd Bergmann, IBM Corp. 5 * Merged from powerpc/kernel/of_platform.c and 6 * sparc{,64}/kernel/of_device.c by Stephen Rothwell 7 * 8 * This program is free software; you can redistribute it and/or 9 * modify it under the terms of the GNU General Public License 10 * as published by the Free Software Foundation; either version 11 * 2 of the License, or (at your option) any later version. 12 * 13 */ 14 #include <linux/errno.h> 15 #include <linux/module.h> 16 #include <linux/device.h> 17 #include <linux/of_device.h> 18 #include <linux/of_platform.h> 19 20 extern struct device_attribute of_platform_device_attrs[]; 21 22 static int of_platform_bus_match(struct device *dev, struct device_driver *drv) 23 { 24 struct of_device *of_dev = to_of_device(dev); 25 struct of_platform_driver *of_drv = to_of_platform_driver(drv); 26 const struct of_device_id *matches = of_drv->match_table; 27 28 if (!matches) 29 return 0; 30 31 return of_match_device(matches, of_dev) != NULL; 32 } 33 34 static int of_platform_device_probe(struct device *dev) 35 { 36 int error = -ENODEV; 37 struct of_platform_driver *drv; 38 struct of_device *of_dev; 39 const struct of_device_id *match; 40 41 drv = to_of_platform_driver(dev->driver); 42 of_dev = to_of_device(dev); 43 44 if (!drv->probe) 45 return error; 46 47 of_dev_get(of_dev); 48 49 match = of_match_device(drv->match_table, of_dev); 50 if (match) 51 error = drv->probe(of_dev, match); 52 if (error) 53 of_dev_put(of_dev); 54 55 return error; 56 } 57 58 static int of_platform_device_remove(struct device *dev) 59 { 60 struct of_device *of_dev = to_of_device(dev); 61 struct of_platform_driver *drv = to_of_platform_driver(dev->driver); 62 63 if (dev->driver && drv->remove) 64 drv->remove(of_dev); 65 return 0; 66 } 67 68 static int of_platform_device_suspend(struct device *dev, pm_message_t state) 69 { 70 struct of_device *of_dev = to_of_device(dev); 71 struct of_platform_driver *drv = to_of_platform_driver(dev->driver); 72 int error = 0; 73 74 if (dev->driver && drv->suspend) 75 error = drv->suspend(of_dev, state); 76 return error; 77 } 78 79 static int of_platform_device_resume(struct device * dev) 80 { 81 struct of_device *of_dev = to_of_device(dev); 82 struct of_platform_driver *drv = to_of_platform_driver(dev->driver); 83 int error = 0; 84 85 if (dev->driver && drv->resume) 86 error = drv->resume(of_dev); 87 return error; 88 } 89 90 static void of_platform_device_shutdown(struct device *dev) 91 { 92 struct of_device *of_dev = to_of_device(dev); 93 struct of_platform_driver *drv = to_of_platform_driver(dev->driver); 94 95 if (dev->driver && drv->shutdown) 96 drv->shutdown(of_dev); 97 } 98 99 int of_bus_type_init(struct bus_type *bus, const char *name) 100 { 101 bus->name = name; 102 bus->match = of_platform_bus_match; 103 bus->probe = of_platform_device_probe; 104 bus->remove = of_platform_device_remove; 105 bus->suspend = of_platform_device_suspend; 106 bus->resume = of_platform_device_resume; 107 bus->shutdown = of_platform_device_shutdown; 108 bus->dev_attrs = of_platform_device_attrs; 109 return bus_register(bus); 110 } 111 112 int of_register_driver(struct of_platform_driver *drv, struct bus_type *bus) 113 { 114 /* initialize common driver fields */ 115 if (!drv->driver.name) 116 drv->driver.name = drv->name; 117 if (!drv->driver.owner) 118 drv->driver.owner = drv->owner; 119 drv->driver.bus = bus; 120 121 /* register with core */ 122 return driver_register(&drv->driver); 123 } 124 EXPORT_SYMBOL(of_register_driver); 125 126 void of_unregister_driver(struct of_platform_driver *drv) 127 { 128 driver_unregister(&drv->driver); 129 } 130 EXPORT_SYMBOL(of_unregister_driver); 131