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/device.h> 16 #include <linux/of_device.h> 17 #include <linux/of_platform.h> 18 19 static int of_platform_bus_match(struct device *dev, struct device_driver *drv) 20 { 21 struct of_device *of_dev = to_of_device(dev); 22 struct of_platform_driver *of_drv = to_of_platform_driver(drv); 23 const struct of_device_id *matches = of_drv->match_table; 24 25 if (!matches) 26 return 0; 27 28 return of_match_device(matches, of_dev) != NULL; 29 } 30 31 static int of_platform_device_probe(struct device *dev) 32 { 33 int error = -ENODEV; 34 struct of_platform_driver *drv; 35 struct of_device *of_dev; 36 const struct of_device_id *match; 37 38 drv = to_of_platform_driver(dev->driver); 39 of_dev = to_of_device(dev); 40 41 if (!drv->probe) 42 return error; 43 44 of_dev_get(of_dev); 45 46 match = of_match_device(drv->match_table, of_dev); 47 if (match) 48 error = drv->probe(of_dev, match); 49 if (error) 50 of_dev_put(of_dev); 51 52 return error; 53 } 54 55 static int of_platform_device_remove(struct device *dev) 56 { 57 struct of_device *of_dev = to_of_device(dev); 58 struct of_platform_driver *drv = to_of_platform_driver(dev->driver); 59 60 if (dev->driver && drv->remove) 61 drv->remove(of_dev); 62 return 0; 63 } 64 65 static int of_platform_device_suspend(struct device *dev, pm_message_t state) 66 { 67 struct of_device *of_dev = to_of_device(dev); 68 struct of_platform_driver *drv = to_of_platform_driver(dev->driver); 69 int error = 0; 70 71 if (dev->driver && drv->suspend) 72 error = drv->suspend(of_dev, state); 73 return error; 74 } 75 76 static int of_platform_device_resume(struct device * dev) 77 { 78 struct of_device *of_dev = to_of_device(dev); 79 struct of_platform_driver *drv = to_of_platform_driver(dev->driver); 80 int error = 0; 81 82 if (dev->driver && drv->resume) 83 error = drv->resume(of_dev); 84 return error; 85 } 86 87 int of_bus_type_init(struct bus_type *bus, const char *name) 88 { 89 bus->name = name; 90 bus->match = of_platform_bus_match; 91 bus->probe = of_platform_device_probe; 92 bus->remove = of_platform_device_remove; 93 bus->suspend = of_platform_device_suspend; 94 bus->resume = of_platform_device_resume; 95 return bus_register(bus); 96 } 97