#include <linux/string.h>#include <linux/kernel.h>#include <linux/of.h>#include <linux/of_device.h>#include <linux/init.h>#include <linux/module.h>#include <linux/mod_devicetable.h>#include <linux/slab.h> #include <asm/errno.h> /** * of_match_device - Tell if a struct device matches an of_device_id list * @ids: array of of device match structures to search in * @dev: the of device structure to match against * * Used by a driver to check whether an platform_device present in the * system is in its list of supported devices. */const struct of_device_id *of_match_device(const struct of_device_id *matches,					   const struct device *dev){	if ((!matches) || (!dev->of_node))		return NULL;	return of_match_node(matches, dev->of_node);}EXPORT_SYMBOL(of_match_device); struct platform_device *of_dev_get(struct platform_device *dev){	struct device *tmp; 	if (!dev)		return NULL;	tmp = get_device(&dev->dev);	if (tmp)		return to_platform_device(tmp);	else		return NULL;}EXPORT_SYMBOL(of_dev_get); void of_dev_put(struct platform_device *dev){	if (dev)		put_device(&dev->dev);}EXPORT_SYMBOL(of_dev_put); int of_device_add(struct platform_device *ofdev){	BUG_ON(ofdev->dev.of_node == NULL); 	/* name and id have to be set so that the platform bus doesn't get	 * confused on matching */	ofdev->name = dev_name(&ofdev->dev);	ofdev->id = -1; 	/* device_add will assume that this device is on the same node as	 * the parent. If there is no parent defined, set the node	 * explicitly */	if (!ofdev->dev.parent)		set_dev_node(&ofdev->dev, of_node_to_nid(ofdev->dev.of_node)); 	return device_add(&ofdev->dev);} int of_device_register(struct platform_device *pdev){	device_initialize(&pdev->dev);	return of_device_add(pdev);}EXPORT_SYMBOL(of_device_register); void of_device_unregister(struct platform_device *ofdev){	device_unregister(&ofdev->dev);}EXPORT_SYMBOL(of_device_unregister); ssize_t of_device_get_modalias(struct device *dev, char *str, ssize_t len){	const char *compat;	int cplen, i;	ssize_t tsize, csize, repend; 	/* Name & Type */	csize = snprintf(str, len, "of:N%sT%s", dev->of_node->name,			 dev->of_node->type); 	/* Get compatible property if any */	compat = of_get_property(dev->of_node, "compatible", &cplen);	if (!compat)		return csize; 	/* Find true end (we tolerate multiple \0 at the end */	for (i = (cplen - 1); i >= 0 && !compat[i]; i--)		cplen--;	if (!cplen)		return csize;	cplen++; 	/* Check space (need cplen+1 chars including final \0) */	tsize = csize + cplen;	repend = tsize; 	if (csize >= len)		/* @ the limit, all is already filled */		return tsize; 	if (tsize >= len) {		/* limit compat list */		cplen = len - csize - 1;		repend = len;	} 	/* Copy and do char replacement */	memcpy(&str[csize + 1], compat, cplen);	for (i = csize; i < repend; i++) {		char c = str[i];		if (c == '\0')			str[i] = 'C';		else if (c == ' ')			str[i] = '_';	} 	return tsize;} /** * of_device_uevent - Display OF related uevent information */int of_device_uevent(struct device *dev, struct kobj_uevent_env *env){	const char *compat;	int seen = 0, cplen, sl; 	if ((!dev) || (!dev->of_node))		return -ENODEV; 	if (add_uevent_var(env, "OF_NAME=%s", dev->of_node->name))		return -ENOMEM; 	if (add_uevent_var(env, "OF_TYPE=%s", dev->of_node->type))		return -ENOMEM; 	/* Since the compatible field can contain pretty much anything	 * it's not really legal to split it out with commas. We split it	 * up using a number of environment variables instead. */ 	compat = of_get_property(dev->of_node, "compatible", &cplen);	while (compat && *compat && cplen > 0) {		if (add_uevent_var(env, "OF_COMPATIBLE_%d=%s", seen, compat))			return -ENOMEM; 		sl = strlen(compat) + 1;		compat += sl;		cplen -= sl;		seen++;	} 	if (add_uevent_var(env, "OF_COMPATIBLE_N=%d", seen))		return -ENOMEM; 	/* modalias is trickier, we add it in 2 steps */	if (add_uevent_var(env, "MODALIAS="))		return -ENOMEM; 	sl = of_device_get_modalias(dev, &env->buf[env->buflen-1],				    sizeof(env->buf) - env->buflen);	if (sl >= (sizeof(env->buf) - env->buflen))		return -ENOMEM;	env->buflen += sl; 	return 0;}