274 строки
6.2 KiB
C
274 строки
6.2 KiB
C
#include <linux/config.h>
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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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#include <linux/slab.h>
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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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* 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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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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match &= dev->node->name
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&& !strcmp(matches->name, dev->node->name);
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if (matches->type[0])
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match &= dev->node->type
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&& !strcmp(matches->type, dev->node->type);
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if (matches->compatible[0])
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match &= device_is_compatible(dev->node,
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matches->compatible);
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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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static int of_platform_bus_match(struct device *dev, struct device_driver *drv)
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{
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struct of_device * of_dev = to_of_device(dev);
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struct of_platform_driver * of_drv = to_of_platform_driver(drv);
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const struct of_device_id * matches = of_drv->match_table;
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if (!matches)
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return 0;
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return of_match_device(matches, of_dev) != NULL;
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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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static int of_device_probe(struct device *dev)
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{
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int error = -ENODEV;
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struct of_platform_driver *drv;
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struct of_device *of_dev;
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const struct of_device_id *match;
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drv = to_of_platform_driver(dev->driver);
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of_dev = to_of_device(dev);
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if (!drv->probe)
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return error;
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of_dev_get(of_dev);
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match = of_match_device(drv->match_table, of_dev);
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if (match)
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error = drv->probe(of_dev, match);
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if (error)
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of_dev_put(of_dev);
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return error;
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}
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static int of_device_remove(struct device *dev)
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{
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struct of_device * of_dev = to_of_device(dev);
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struct of_platform_driver * drv = to_of_platform_driver(dev->driver);
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if (dev->driver && drv->remove)
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drv->remove(of_dev);
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return 0;
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}
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static int of_device_suspend(struct device *dev, pm_message_t state)
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{
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struct of_device * of_dev = to_of_device(dev);
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struct of_platform_driver * drv = to_of_platform_driver(dev->driver);
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int error = 0;
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if (dev->driver && drv->suspend)
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error = drv->suspend(of_dev, state);
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return error;
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}
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static int of_device_resume(struct device * dev)
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{
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struct of_device * of_dev = to_of_device(dev);
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struct of_platform_driver * drv = to_of_platform_driver(dev->driver);
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int error = 0;
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if (dev->driver && drv->resume)
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error = drv->resume(of_dev);
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return error;
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}
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struct bus_type of_platform_bus_type = {
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.name = "of_platform",
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.match = of_platform_bus_match,
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.probe = of_device_probe,
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.remove = of_device_remove,
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.suspend = of_device_suspend,
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.resume = of_device_resume,
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};
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static int __init of_bus_driver_init(void)
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{
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return bus_register(&of_platform_bus_type);
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}
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postcore_initcall(of_bus_driver_init);
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int of_register_driver(struct of_platform_driver *drv)
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{
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/* initialize common driver fields */
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drv->driver.name = drv->name;
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drv->driver.bus = &of_platform_bus_type;
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/* register with core */
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return driver_register(&drv->driver);
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}
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void of_unregister_driver(struct of_platform_driver *drv)
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{
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driver_unregister(&drv->driver);
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}
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static ssize_t dev_show_devspec(struct device *dev, 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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struct of_device **odprop;
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BUG_ON(ofdev->node == NULL);
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odprop = (struct of_device **)get_property(ofdev->node, "linux,device", NULL);
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if (!odprop) {
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struct property *new_prop;
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new_prop = kmalloc(sizeof(struct property) + sizeof(struct of_device *),
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GFP_KERNEL);
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if (new_prop == NULL)
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return -ENOMEM;
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new_prop->name = "linux,device";
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new_prop->length = sizeof(sizeof(struct of_device *));
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new_prop->value = (unsigned char *)&new_prop[1];
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odprop = (struct of_device **)new_prop->value;
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*odprop = NULL;
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prom_add_property(ofdev->node, new_prop);
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}
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*odprop = ofdev;
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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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device_create_file(&ofdev->dev, &dev_attr_devspec);
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return 0;
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}
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void of_device_unregister(struct of_device *ofdev)
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{
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struct of_device **odprop;
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device_remove_file(&ofdev->dev, &dev_attr_devspec);
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odprop = (struct of_device **)get_property(ofdev->node, "linux,device", NULL);
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if (odprop)
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*odprop = NULL;
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device_unregister(&ofdev->dev);
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}
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struct of_device* of_platform_device_create(struct device_node *np,
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const char *bus_id,
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struct device *parent)
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{
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struct of_device *dev;
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dev = kmalloc(sizeof(*dev), GFP_KERNEL);
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if (!dev)
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return NULL;
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memset(dev, 0, sizeof(*dev));
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dev->node = of_node_get(np);
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dev->dma_mask = 0xffffffffUL;
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dev->dev.dma_mask = &dev->dma_mask;
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dev->dev.parent = parent;
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dev->dev.bus = &of_platform_bus_type;
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dev->dev.release = of_release_dev;
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strlcpy(dev->dev.bus_id, bus_id, BUS_ID_SIZE);
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if (of_device_register(dev) != 0) {
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kfree(dev);
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return NULL;
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}
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return dev;
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}
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EXPORT_SYMBOL(of_match_device);
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EXPORT_SYMBOL(of_platform_bus_type);
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EXPORT_SYMBOL(of_register_driver);
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EXPORT_SYMBOL(of_unregister_driver);
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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_platform_device_create);
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EXPORT_SYMBOL(of_release_dev);
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