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 a struct device matches an of_device_id list 14 * @ids: array of of device match structures to search in 15 * @dev: the of device structure to match against 16 * 17 * Used by a driver to check whether an platform_device present in the 18 * system is in its list of supported devices. 19 */ 20 const struct of_device_id *of_match_device(const struct of_device_id *matches, 21 const struct device *dev) 22 { 23 if ((!matches) || (!dev->of_node)) 24 return NULL; 25 return of_match_node(matches, dev->of_node); 26 } 27 EXPORT_SYMBOL(of_match_device); 28 29 struct platform_device *of_dev_get(struct platform_device *dev) 30 { 31 struct device *tmp; 32 33 if (!dev) 34 return NULL; 35 tmp = get_device(&dev->dev); 36 if (tmp) 37 return to_platform_device(tmp); 38 else 39 return NULL; 40 } 41 EXPORT_SYMBOL(of_dev_get); 42 43 void of_dev_put(struct platform_device *dev) 44 { 45 if (dev) 46 put_device(&dev->dev); 47 } 48 EXPORT_SYMBOL(of_dev_put); 49 50 int of_device_add(struct platform_device *ofdev) 51 { 52 BUG_ON(ofdev->dev.of_node == NULL); 53 54 /* name and id have to be set so that the platform bus doesn't get 55 * confused on matching */ 56 ofdev->name = dev_name(&ofdev->dev); 57 ofdev->id = -1; 58 59 /* device_add will assume that this device is on the same node as 60 * the parent. If there is no parent defined, set the node 61 * explicitly */ 62 if (!ofdev->dev.parent) 63 set_dev_node(&ofdev->dev, of_node_to_nid(ofdev->dev.of_node)); 64 65 return device_add(&ofdev->dev); 66 } 67 68 int of_device_register(struct platform_device *pdev) 69 { 70 device_initialize(&pdev->dev); 71 return of_device_add(pdev); 72 } 73 EXPORT_SYMBOL(of_device_register); 74 75 void of_device_unregister(struct platform_device *ofdev) 76 { 77 device_unregister(&ofdev->dev); 78 } 79 EXPORT_SYMBOL(of_device_unregister); 80 81 ssize_t of_device_get_modalias(struct device *dev, char *str, ssize_t len) 82 { 83 const char *compat; 84 int cplen, i; 85 ssize_t tsize, csize, repend; 86 87 /* Name & Type */ 88 csize = snprintf(str, len, "of:N%sT%s", dev->of_node->name, 89 dev->of_node->type); 90 91 /* Get compatible property if any */ 92 compat = of_get_property(dev->of_node, "compatible", &cplen); 93 if (!compat) 94 return csize; 95 96 /* Find true end (we tolerate multiple \0 at the end */ 97 for (i = (cplen - 1); i >= 0 && !compat[i]; i--) 98 cplen--; 99 if (!cplen) 100 return csize; 101 cplen++; 102 103 /* Check space (need cplen+1 chars including final \0) */ 104 tsize = csize + cplen; 105 repend = tsize; 106 107 if (csize >= len) /* @ the limit, all is already filled */ 108 return tsize; 109 110 if (tsize >= len) { /* limit compat list */ 111 cplen = len - csize - 1; 112 repend = len; 113 } 114 115 /* Copy and do char replacement */ 116 memcpy(&str[csize + 1], compat, cplen); 117 for (i = csize; i < repend; i++) { 118 char c = str[i]; 119 if (c == '\0') 120 str[i] = 'C'; 121 else if (c == ' ') 122 str[i] = '_'; 123 } 124 125 return tsize; 126 } 127 128 /** 129 * of_device_uevent - Display OF related uevent information 130 */ 131 void of_device_uevent(struct device *dev, struct kobj_uevent_env *env) 132 { 133 const char *compat; 134 int seen = 0, cplen, sl; 135 136 if ((!dev) || (!dev->of_node)) 137 return; 138 139 add_uevent_var(env, "OF_NAME=%s", dev->of_node->name); 140 add_uevent_var(env, "OF_FULLNAME=%s", dev->of_node->full_name); 141 if (dev->of_node->type && strcmp("<NULL>", dev->of_node->type) != 0) 142 add_uevent_var(env, "OF_TYPE=%s", dev->of_node->type); 143 144 /* Since the compatible field can contain pretty much anything 145 * it's not really legal to split it out with commas. We split it 146 * up using a number of environment variables instead. */ 147 compat = of_get_property(dev->of_node, "compatible", &cplen); 148 while (compat && *compat && cplen > 0) { 149 add_uevent_var(env, "OF_COMPATIBLE_%d=%s", seen, compat); 150 sl = strlen(compat) + 1; 151 compat += sl; 152 cplen -= sl; 153 seen++; 154 } 155 add_uevent_var(env, "OF_COMPATIBLE_N=%d", seen); 156 } 157 158 int of_device_uevent_modalias(struct device *dev, struct kobj_uevent_env *env) 159 { 160 int sl; 161 162 if ((!dev) || (!dev->of_node)) 163 return -ENODEV; 164 165 /* Devicetree modalias is tricky, we add it in 2 steps */ 166 if (add_uevent_var(env, "MODALIAS=")) 167 return -ENOMEM; 168 169 sl = of_device_get_modalias(dev, &env->buf[env->buflen-1], 170 sizeof(env->buf) - env->buflen); 171 if (sl >= (sizeof(env->buf) - env->buflen)) 172 return -ENOMEM; 173 env->buflen += sl; 174 175 return 0; 176 } 177