2005-10-05 21:22:17 -06:00
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#include <linux/string.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/mod_devicetable.h>
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2005-10-30 19:57:01 -07:00
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#include <linux/slab.h>
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2005-10-05 21:22:17 -06:00
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#include <asm/errno.h>
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#include <asm/of_device.h>
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/**
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2006-11-10 23:24:59 -07:00
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* of_match_node - Tell if an device_node has a matching of_match structure
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2005-10-05 21:22:17 -06:00
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* @ids: array of of device match structures to search in
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2006-11-10 23:24:59 -07:00
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* @node: the of device structure to match against
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2005-10-05 21:22:17 -06:00
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*
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2006-11-10 23:24:59 -07:00
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* Low level utility function used by device matching.
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2005-10-05 21:22:17 -06:00
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*/
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2006-11-10 23:24:59 -07:00
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const struct of_device_id *of_match_node(const struct of_device_id *matches,
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const struct device_node *node)
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2005-10-05 21:22:17 -06:00
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{
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while (matches->name[0] || matches->type[0] || matches->compatible[0]) {
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int match = 1;
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if (matches->name[0])
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2006-11-10 23:24:59 -07:00
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match &= node->name
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&& !strcmp(matches->name, node->name);
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2005-10-05 21:22:17 -06:00
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if (matches->type[0])
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2006-11-10 23:24:59 -07:00
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match &= node->type
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&& !strcmp(matches->type, node->type);
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2005-10-05 21:22:17 -06:00
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if (matches->compatible[0])
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2006-11-10 23:24:59 -07:00
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match &= device_is_compatible(node,
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matches->compatible);
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2005-10-05 21:22:17 -06:00
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if (match)
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return matches;
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matches++;
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}
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return NULL;
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}
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2006-11-10 23:24:59 -07:00
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/**
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* of_match_device - Tell if an of_device structure has a matching
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* of_match structure
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* @ids: array of of device match structures to search in
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* @dev: the of device structure to match against
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*
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* Used by a driver to check whether an of_device present in the
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* system is in its list of supported devices.
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*/
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const struct of_device_id *of_match_device(const struct of_device_id *matches,
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const struct of_device *dev)
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{
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if (!dev->node)
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return NULL;
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return of_match_node(matches, dev->node);
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2005-10-05 21:22:17 -06:00
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}
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struct of_device *of_dev_get(struct of_device *dev)
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{
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struct device *tmp;
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if (!dev)
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return NULL;
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tmp = get_device(&dev->dev);
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if (tmp)
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return to_of_device(tmp);
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else
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return NULL;
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}
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void of_dev_put(struct of_device *dev)
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{
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if (dev)
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put_device(&dev->dev);
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}
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2006-11-10 23:24:59 -07:00
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static ssize_t dev_show_devspec(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct of_device *ofdev;
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ofdev = to_of_device(dev);
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return sprintf(buf, "%s", ofdev->node->full_name);
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}
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static DEVICE_ATTR(devspec, S_IRUGO, dev_show_devspec, NULL);
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/**
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* of_release_dev - free an of device structure when all users of it are finished.
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* @dev: device that's been disconnected
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*
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* Will be called only by the device core when all users of this of device are
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* done.
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*/
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void of_release_dev(struct device *dev)
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{
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struct of_device *ofdev;
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ofdev = to_of_device(dev);
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of_node_put(ofdev->node);
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kfree(ofdev);
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}
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int of_device_register(struct of_device *ofdev)
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{
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int rc;
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BUG_ON(ofdev->node == NULL);
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rc = device_register(&ofdev->dev);
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if (rc)
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return rc;
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2006-12-08 01:23:07 -07:00
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return device_create_file(&ofdev->dev, &dev_attr_devspec);
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}
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void of_device_unregister(struct of_device *ofdev)
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{
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device_remove_file(&ofdev->dev, &dev_attr_devspec);
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device_unregister(&ofdev->dev);
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}
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2007-02-12 15:13:25 -07:00
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static ssize_t of_device_get_modalias(struct of_device *ofdev,
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char *str, ssize_t len)
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{
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const char *compat;
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int cplen, i;
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ssize_t tsize, csize, repend;
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/* Name & Type */
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csize = snprintf(str, len, "of:N%sT%s",
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ofdev->node->name, ofdev->node->type);
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/* Get compatible property if any */
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compat = get_property(ofdev->node, "compatible", &cplen);
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if (!compat)
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return csize;
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/* Find true end (we tolerate multiple \0 at the end */
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for (i=(cplen-1); i>=0 && !compat[i]; i--)
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cplen--;
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if (!cplen)
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return csize;
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cplen++;
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/* Check space (need cplen+1 chars including final \0) */
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tsize = csize + cplen;
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repend = tsize;
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if (csize>=len) /* @ the limit, all is already filled */
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return tsize;
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if (tsize>=len) { /* limit compat list */
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cplen = len-csize-1;
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repend = len;
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}
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/* Copy and do char replacement */
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memcpy(&str[csize+1], compat, cplen);
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for (i=csize; i<repend; i++) {
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char c = str[i];
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if (c=='\0')
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str[i] = 'C';
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else if (c==' ')
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str[i] = '_';
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}
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return tsize;
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}
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int of_device_uevent(struct device *dev,
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char **envp, int num_envp, char *buffer, int buffer_size)
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{
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struct of_device *ofdev;
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const char *compat;
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int i = 0, length = 0, seen = 0, cplen, sl;
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if (!dev)
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return -ENODEV;
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ofdev = to_of_device(dev);
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if (add_uevent_var(envp, num_envp, &i,
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buffer, buffer_size, &length,
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"OF_NAME=%s", ofdev->node->name))
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return -ENOMEM;
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if (add_uevent_var(envp, num_envp, &i,
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buffer, buffer_size, &length,
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"OF_TYPE=%s", ofdev->node->type))
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return -ENOMEM;
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/* Since the compatible field can contain pretty much anything
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* it's not really legal to split it out with commas. We split it
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* up using a number of environment variables instead. */
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compat = get_property(ofdev->node, "compatible", &cplen);
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while (compat && *compat && cplen > 0) {
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if (add_uevent_var(envp, num_envp, &i,
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buffer, buffer_size, &length,
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"OF_COMPATIBLE_%d=%s", seen, compat))
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return -ENOMEM;
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sl = strlen (compat) + 1;
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compat += sl;
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cplen -= sl;
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seen++;
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}
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if (add_uevent_var(envp, num_envp, &i,
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buffer, buffer_size, &length,
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"OF_COMPATIBLE_N=%d", seen))
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return -ENOMEM;
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/* modalias is trickier, we add it in 2 steps */
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if (add_uevent_var(envp, num_envp, &i,
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buffer, buffer_size, &length,
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"MODALIAS="))
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return -ENOMEM;
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sl = of_device_get_modalias(ofdev, &buffer[length-1],
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buffer_size-length);
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if (sl >= (buffer_size-length))
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return -ENOMEM;
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length += sl;
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envp[i] = NULL;
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return 0;
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}
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2006-12-04 17:29:12 -07:00
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EXPORT_SYMBOL(of_match_node);
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2005-10-05 21:22:17 -06:00
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EXPORT_SYMBOL(of_match_device);
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EXPORT_SYMBOL(of_device_register);
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EXPORT_SYMBOL(of_device_unregister);
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EXPORT_SYMBOL(of_dev_get);
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EXPORT_SYMBOL(of_dev_put);
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EXPORT_SYMBOL(of_release_dev);
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2007-02-12 15:13:25 -07:00
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EXPORT_SYMBOL(of_device_uevent);
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