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 #include "of_private.h" 12 13 /** 14 * of_match_device - Tell if a struct device matches an of_device_id list 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 platform_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 device *dev) 23 { 24 if ((!matches) || (!dev->of_node)) 25 return NULL; 26 return of_match_node(matches, dev->of_node); 27 } 28 EXPORT_SYMBOL(of_match_device); 29 30 struct platform_device *of_dev_get(struct platform_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_platform_device(tmp); 39 else 40 return NULL; 41 } 42 EXPORT_SYMBOL(of_dev_get); 43 44 void of_dev_put(struct platform_device *dev) 45 { 46 if (dev) 47 put_device(&dev->dev); 48 } 49 EXPORT_SYMBOL(of_dev_put); 50 51 int of_device_add(struct platform_device *ofdev) 52 { 53 BUG_ON(ofdev->dev.of_node == NULL); 54 55 /* name and id have to be set so that the platform bus doesn't get 56 * confused on matching */ 57 ofdev->name = dev_name(&ofdev->dev); 58 ofdev->id = -1; 59 60 /* device_add will assume that this device is on the same node as 61 * the parent. If there is no parent defined, set the node 62 * explicitly */ 63 if (!ofdev->dev.parent) 64 set_dev_node(&ofdev->dev, of_node_to_nid(ofdev->dev.of_node)); 65 66 return device_add(&ofdev->dev); 67 } 68 69 int of_device_register(struct platform_device *pdev) 70 { 71 device_initialize(&pdev->dev); 72 return of_device_add(pdev); 73 } 74 EXPORT_SYMBOL(of_device_register); 75 76 void of_device_unregister(struct platform_device *ofdev) 77 { 78 device_unregister(&ofdev->dev); 79 } 80 EXPORT_SYMBOL(of_device_unregister); 81 82 ssize_t of_device_get_modalias(struct device *dev, char *str, ssize_t len) 83 { 84 const char *compat; 85 int cplen, i; 86 ssize_t tsize, csize, repend; 87 88 if ((!dev) || (!dev->of_node)) 89 return -ENODEV; 90 91 /* Name & Type */ 92 csize = snprintf(str, len, "of:N%sT%s", dev->of_node->name, 93 dev->of_node->type); 94 95 /* Get compatible property if any */ 96 compat = of_get_property(dev->of_node, "compatible", &cplen); 97 if (!compat) 98 return csize; 99 100 /* Find true end (we tolerate multiple \0 at the end */ 101 for (i = (cplen - 1); i >= 0 && !compat[i]; i--) 102 cplen--; 103 if (!cplen) 104 return csize; 105 cplen++; 106 107 /* Check space (need cplen+1 chars including final \0) */ 108 tsize = csize + cplen; 109 repend = tsize; 110 111 if (csize >= len) /* @ the limit, all is already filled */ 112 return tsize; 113 114 if (tsize >= len) { /* limit compat list */ 115 cplen = len - csize - 1; 116 repend = len; 117 } 118 119 /* Copy and do char replacement */ 120 memcpy(&str[csize + 1], compat, cplen); 121 for (i = csize; i < repend; i++) { 122 char c = str[i]; 123 if (c == '\0') 124 str[i] = 'C'; 125 else if (c == ' ') 126 str[i] = '_'; 127 } 128 129 return tsize; 130 } 131 132 /** 133 * of_device_uevent - Display OF related uevent information 134 */ 135 void of_device_uevent(struct device *dev, struct kobj_uevent_env *env) 136 { 137 const char *compat; 138 struct alias_prop *app; 139 int seen = 0, cplen, sl; 140 141 if ((!dev) || (!dev->of_node)) 142 return; 143 144 add_uevent_var(env, "OF_NAME=%s", dev->of_node->name); 145 add_uevent_var(env, "OF_FULLNAME=%s", dev->of_node->full_name); 146 if (dev->of_node->type && strcmp("<NULL>", dev->of_node->type) != 0) 147 add_uevent_var(env, "OF_TYPE=%s", dev->of_node->type); 148 149 /* Since the compatible field can contain pretty much anything 150 * it's not really legal to split it out with commas. We split it 151 * up using a number of environment variables instead. */ 152 compat = of_get_property(dev->of_node, "compatible", &cplen); 153 while (compat && *compat && cplen > 0) { 154 add_uevent_var(env, "OF_COMPATIBLE_%d=%s", seen, compat); 155 sl = strlen(compat) + 1; 156 compat += sl; 157 cplen -= sl; 158 seen++; 159 } 160 add_uevent_var(env, "OF_COMPATIBLE_N=%d", seen); 161 162 seen = 0; 163 mutex_lock(&of_aliases_mutex); 164 list_for_each_entry(app, &aliases_lookup, link) { 165 if (dev->of_node == app->np) { 166 add_uevent_var(env, "OF_ALIAS_%d=%s", seen, 167 app->alias); 168 seen++; 169 } 170 } 171 mutex_unlock(&of_aliases_mutex); 172 } 173 174 int of_device_uevent_modalias(struct device *dev, struct kobj_uevent_env *env) 175 { 176 int sl; 177 178 if ((!dev) || (!dev->of_node)) 179 return -ENODEV; 180 181 /* Devicetree modalias is tricky, we add it in 2 steps */ 182 if (add_uevent_var(env, "MODALIAS=")) 183 return -ENOMEM; 184 185 sl = of_device_get_modalias(dev, &env->buf[env->buflen-1], 186 sizeof(env->buf) - env->buflen); 187 if (sl >= (sizeof(env->buf) - env->buflen)) 188 return -ENOMEM; 189 env->buflen += sl; 190 191 return 0; 192 } 193