1 #include <linux/string.h> 2 #include <linux/kernel.h> 3 #include <linux/of.h> 4 #include <linux/of_device.h> 5 #include <linux/init.h> 6 #include <linux/module.h> 7 #include <linux/mod_devicetable.h> 8 #include <linux/slab.h> 9 10 #include <asm/errno.h> 11 12 /** 13 * of_match_device - Tell if an of_device structure has a matching 14 * of_match structure 15 * @ids: array of of device match structures to search in 16 * @dev: the of device structure to match against 17 * 18 * Used by a driver to check whether an of_device present in the 19 * system is in its list of supported devices. 20 */ 21 const struct of_device_id *of_match_device(const struct of_device_id *matches, 22 const struct of_device *dev) 23 { 24 if (!dev->node) 25 return NULL; 26 return of_match_node(matches, dev->node); 27 } 28 EXPORT_SYMBOL(of_match_device); 29 30 struct of_device *of_dev_get(struct of_device *dev) 31 { 32 struct device *tmp; 33 34 if (!dev) 35 return NULL; 36 tmp = get_device(&dev->dev); 37 if (tmp) 38 return to_of_device(tmp); 39 else 40 return NULL; 41 } 42 EXPORT_SYMBOL(of_dev_get); 43 44 void of_dev_put(struct of_device *dev) 45 { 46 if (dev) 47 put_device(&dev->dev); 48 } 49 EXPORT_SYMBOL(of_dev_put); 50 51 static ssize_t dev_show_devspec(struct device *dev, 52 struct device_attribute *attr, char *buf) 53 { 54 struct of_device *ofdev; 55 56 ofdev = to_of_device(dev); 57 return sprintf(buf, "%s", ofdev->node->full_name); 58 } 59 60 static DEVICE_ATTR(devspec, S_IRUGO, dev_show_devspec, NULL); 61 62 /** 63 * of_release_dev - free an of device structure when all users of it are finished. 64 * @dev: device that's been disconnected 65 * 66 * Will be called only by the device core when all users of this of device are 67 * done. 68 */ 69 void of_release_dev(struct device *dev) 70 { 71 struct of_device *ofdev; 72 73 ofdev = to_of_device(dev); 74 of_node_put(ofdev->node); 75 kfree(ofdev); 76 } 77 EXPORT_SYMBOL(of_release_dev); 78 79 int of_device_register(struct of_device *ofdev) 80 { 81 int rc; 82 83 BUG_ON(ofdev->node == NULL); 84 85 rc = device_register(&ofdev->dev); 86 if (rc) 87 return rc; 88 89 rc = device_create_file(&ofdev->dev, &dev_attr_devspec); 90 if (rc) 91 device_unregister(&ofdev->dev); 92 93 return rc; 94 } 95 EXPORT_SYMBOL(of_device_register); 96 97 void of_device_unregister(struct of_device *ofdev) 98 { 99 device_remove_file(&ofdev->dev, &dev_attr_devspec); 100 device_unregister(&ofdev->dev); 101 } 102 EXPORT_SYMBOL(of_device_unregister); 103