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 static int of_platform_bus_match(struct device *dev, struct device_driver *drv) 21 { 22 struct of_device *of_dev = to_of_device(dev); 23 struct of_platform_driver *of_drv = to_of_platform_driver(drv); 24 const struct of_device_id *matches = of_drv->match_table; 25 26 if (!matches) 27 return 0; 28 29 return of_match_device(matches, of_dev) != NULL; 30 } 31 32 static int of_platform_device_probe(struct device *dev) 33 { 34 int error = -ENODEV; 35 struct of_platform_driver *drv; 36 struct of_device *of_dev; 37 const struct of_device_id *match; 38 39 drv = to_of_platform_driver(dev->driver); 40 of_dev = to_of_device(dev); 41 42 if (!drv->probe) 43 return error; 44 45 of_dev_get(of_dev); 46 47 match = of_match_device(drv->match_table, of_dev); 48 if (match) 49 error = drv->probe(of_dev, match); 50 if (error) 51 of_dev_put(of_dev); 52 53 return error; 54 } 55 56 static int of_platform_device_remove(struct device *dev) 57 { 58 struct of_device *of_dev = to_of_device(dev); 59 struct of_platform_driver *drv = to_of_platform_driver(dev->driver); 60 61 if (dev->driver && drv->remove) 62 drv->remove(of_dev); 63 return 0; 64 } 65 66 static int of_platform_device_suspend(struct device *dev, pm_message_t state) 67 { 68 struct of_device *of_dev = to_of_device(dev); 69 struct of_platform_driver *drv = to_of_platform_driver(dev->driver); 70 int error = 0; 71 72 if (dev->driver && drv->suspend) 73 error = drv->suspend(of_dev, state); 74 return error; 75 } 76 77 static int of_platform_device_resume(struct device * dev) 78 { 79 struct of_device *of_dev = to_of_device(dev); 80 struct of_platform_driver *drv = to_of_platform_driver(dev->driver); 81 int error = 0; 82 83 if (dev->driver && drv->resume) 84 error = drv->resume(of_dev); 85 return error; 86 } 87 88 int of_bus_type_init(struct bus_type *bus, const char *name) 89 { 90 bus->name = name; 91 bus->match = of_platform_bus_match; 92 bus->probe = of_platform_device_probe; 93 bus->remove = of_platform_device_remove; 94 bus->suspend = of_platform_device_suspend; 95 bus->resume = of_platform_device_resume; 96 return bus_register(bus); 97 } 98 99 int of_register_driver(struct of_platform_driver *drv, struct bus_type *bus) 100 { 101 /* initialize common driver fields */ 102 if (!drv->driver.name) 103 drv->driver.name = drv->name; 104 if (!drv->driver.owner) 105 drv->driver.owner = drv->owner; 106 drv->driver.bus = bus; 107 108 /* register with core */ 109 return driver_register(&drv->driver); 110 } 111 EXPORT_SYMBOL(of_register_driver); 112 113 void of_unregister_driver(struct of_platform_driver *drv) 114 { 115 driver_unregister(&drv->driver); 116 } 117 EXPORT_SYMBOL(of_unregister_driver); 118