Stephen Rothwell | f85ff30 | 2007-05-01 16:40:36 +1000 | [diff] [blame] | 1 | #include <linux/string.h> |
| 2 | #include <linux/kernel.h> |
| 3 | #include <linux/of.h> |
Stephen Rothwell | f898f8d | 2007-05-01 16:49:51 +1000 | [diff] [blame] | 4 | #include <linux/of_device.h> |
Stephen Rothwell | f85ff30 | 2007-05-01 16:40:36 +1000 | [diff] [blame] | 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> |
Stephen Rothwell | f85ff30 | 2007-05-01 16:40:36 +1000 | [diff] [blame] | 11 | |
| 12 | /** |
Stephen Rothwell | f85ff30 | 2007-05-01 16:40:36 +1000 | [diff] [blame] | 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 | |
Olaf Hering | 140b932 | 2008-04-24 23:16:00 +1000 | [diff] [blame] | 51 | static ssize_t devspec_show(struct device *dev, |
Stephen Rothwell | f85ff30 | 2007-05-01 16:40:36 +1000 | [diff] [blame] | 52 | struct device_attribute *attr, char *buf) |
| 53 | { |
| 54 | struct of_device *ofdev; |
| 55 | |
| 56 | ofdev = to_of_device(dev); |
Olaf Hering | 140b932 | 2008-04-24 23:16:00 +1000 | [diff] [blame] | 57 | return sprintf(buf, "%s\n", ofdev->node->full_name); |
Stephen Rothwell | f85ff30 | 2007-05-01 16:40:36 +1000 | [diff] [blame] | 58 | } |
| 59 | |
Olaf Hering | 140b932 | 2008-04-24 23:16:00 +1000 | [diff] [blame] | 60 | static ssize_t modalias_show(struct device *dev, |
| 61 | struct device_attribute *attr, char *buf) |
| 62 | { |
| 63 | struct of_device *ofdev = to_of_device(dev); |
| 64 | ssize_t len = 0; |
| 65 | |
| 66 | len = of_device_get_modalias(ofdev, buf, PAGE_SIZE - 2); |
| 67 | buf[len] = '\n'; |
| 68 | buf[len+1] = 0; |
| 69 | return len+1; |
| 70 | } |
| 71 | |
| 72 | struct device_attribute of_platform_device_attrs[] = { |
| 73 | __ATTR_RO(devspec), |
| 74 | __ATTR_RO(modalias), |
| 75 | __ATTR_NULL |
| 76 | }; |
Stephen Rothwell | f85ff30 | 2007-05-01 16:40:36 +1000 | [diff] [blame] | 77 | |
| 78 | /** |
| 79 | * of_release_dev - free an of device structure when all users of it are finished. |
| 80 | * @dev: device that's been disconnected |
| 81 | * |
| 82 | * Will be called only by the device core when all users of this of device are |
| 83 | * done. |
| 84 | */ |
| 85 | void of_release_dev(struct device *dev) |
| 86 | { |
| 87 | struct of_device *ofdev; |
| 88 | |
| 89 | ofdev = to_of_device(dev); |
| 90 | of_node_put(ofdev->node); |
| 91 | kfree(ofdev); |
| 92 | } |
| 93 | EXPORT_SYMBOL(of_release_dev); |
| 94 | |
| 95 | int of_device_register(struct of_device *ofdev) |
| 96 | { |
Stephen Rothwell | f85ff30 | 2007-05-01 16:40:36 +1000 | [diff] [blame] | 97 | BUG_ON(ofdev->node == NULL); |
Olaf Hering | 140b932 | 2008-04-24 23:16:00 +1000 | [diff] [blame] | 98 | return device_register(&ofdev->dev); |
Stephen Rothwell | f85ff30 | 2007-05-01 16:40:36 +1000 | [diff] [blame] | 99 | } |
| 100 | EXPORT_SYMBOL(of_device_register); |
| 101 | |
| 102 | void of_device_unregister(struct of_device *ofdev) |
| 103 | { |
Stephen Rothwell | f85ff30 | 2007-05-01 16:40:36 +1000 | [diff] [blame] | 104 | device_unregister(&ofdev->dev); |
| 105 | } |
| 106 | EXPORT_SYMBOL(of_device_unregister); |
Stephen Rothwell | 09e67ca | 2008-05-16 11:57:45 +1000 | [diff] [blame] | 107 | |
| 108 | ssize_t of_device_get_modalias(struct of_device *ofdev, |
| 109 | char *str, ssize_t len) |
| 110 | { |
| 111 | const char *compat; |
| 112 | int cplen, i; |
| 113 | ssize_t tsize, csize, repend; |
| 114 | |
| 115 | /* Name & Type */ |
| 116 | csize = snprintf(str, len, "of:N%sT%s", |
| 117 | ofdev->node->name, ofdev->node->type); |
| 118 | |
| 119 | /* Get compatible property if any */ |
| 120 | compat = of_get_property(ofdev->node, "compatible", &cplen); |
| 121 | if (!compat) |
| 122 | return csize; |
| 123 | |
| 124 | /* Find true end (we tolerate multiple \0 at the end */ |
| 125 | for (i = (cplen - 1); i >= 0 && !compat[i]; i--) |
| 126 | cplen--; |
| 127 | if (!cplen) |
| 128 | return csize; |
| 129 | cplen++; |
| 130 | |
| 131 | /* Check space (need cplen+1 chars including final \0) */ |
| 132 | tsize = csize + cplen; |
| 133 | repend = tsize; |
| 134 | |
| 135 | if (csize >= len) /* @ the limit, all is already filled */ |
| 136 | return tsize; |
| 137 | |
| 138 | if (tsize >= len) { /* limit compat list */ |
| 139 | cplen = len - csize - 1; |
| 140 | repend = len; |
| 141 | } |
| 142 | |
| 143 | /* Copy and do char replacement */ |
| 144 | memcpy(&str[csize + 1], compat, cplen); |
| 145 | for (i = csize; i < repend; i++) { |
| 146 | char c = str[i]; |
| 147 | if (c == '\0') |
| 148 | str[i] = 'C'; |
| 149 | else if (c == ' ') |
| 150 | str[i] = '_'; |
| 151 | } |
| 152 | |
| 153 | return tsize; |
| 154 | } |