Release 4.12 drivers/of/device.c

#include <linux/string.h>
#include <linux/kernel.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_address.h>
#include <linux/of_iommu.h>
#include <linux/dma-mapping.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mod_devicetable.h>
#include <linux/slab.h>

#include <asm/errno.h>
#include "of_private.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);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Stephen Rothwell
37
78.72%
1
25.00%
Grant C. Likely
10
21.28%
3
75.00%
Total
47
100.00%
4
100.00%


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;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Stephen Rothwell
46
93.88%
1
50.00%
Grant C. Likely
3
6.12%
1
50.00%
Total
49
100.00%
2
100.00%


EXPORT_SYMBOL(of_dev_get);



void of_dev_put(struct platform_device *dev)
{
	if (dev)
		put_device(&dev->dev);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Stephen Rothwell
21
95.45%
1
50.00%
Grant C. Likely
1
4.55%
1
50.00%
Total
22
100.00%
2
100.00%


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;

	/*
         * If this device has not binding numa node in devicetree, that is
         * of_node_to_nid returns NUMA_NO_NODE. device_add will assume that this
         * device is on the same node as the parent.
         */
	set_dev_node(&ofdev->dev, of_node_to_nid(ofdev->dev.of_node));

	return device_add(&ofdev->dev);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Grant C. Likely
28
41.18%
4
57.14%
Stephen Rothwell
24
35.29%
1
14.29%
Jeremy Kerr
15
22.06%
1
14.29%
Zhen Lei
1
1.47%
1
14.29%
Total
68
100.00%
7
100.00%

/**
 * of_dma_configure - Setup DMA configuration
 * @dev:        Device to apply DMA configuration
 * @np:         Pointer to OF node having DMA configuration
 *
 * Try to get devices's DMA configuration from DT and update it
 * accordingly.
 *
 * If platform code needs to use its own special DMA configuration, it
 * can use a platform bus notifier and handle BUS_NOTIFY_ADD_DEVICE events
 * to fix up DMA configuration.
 */


int of_dma_configure(struct device *dev, struct device_node *np)
{
	u64 dma_addr, paddr, size;
	int ret;
	bool coherent;
	unsigned long offset;
	const struct iommu_ops *iommu;

	/*
         * Set default coherent_dma_mask to 32 bit.  Drivers are expected to
         * setup the correct supported mask.
         */
	if (!dev->coherent_dma_mask)
		dev->coherent_dma_mask = DMA_BIT_MASK(32);

	/*
         * Set it to coherent_dma_mask by default if the architecture
         * code has not set it.
         */
	if (!dev->dma_mask)
		dev->dma_mask = &dev->coherent_dma_mask;

	ret = of_dma_get_range(np, &dma_addr, &paddr, &size);
	if (ret < 0) {
		dma_addr = offset = 0;
		size = max(dev->coherent_dma_mask, dev->coherent_dma_mask + 1);
	} else {
		offset = PFN_DOWN(paddr - dma_addr);

		/*
                 * Add a work around to treat the size as mask + 1 in case
                 * it is defined in DT as a mask.
                 */
		if (size & 1) {
			dev_warn(dev, "Invalid size 0x%llx for dma-range\n",
				 size);
			size = size + 1;
		}

		if (!size) {
			dev_err(dev, "Adjusted size 0x%llx invalid\n", size);
			return -EINVAL;
		}
		dev_dbg(dev, "dma_pfn_offset(%#08lx)\n", offset);
	}

	dev->dma_pfn_offset = offset;

	/*
         * Limit coherent and dma mask based on size and default mask
         * set by the driver.
         */
	dev->coherent_dma_mask = min(dev->coherent_dma_mask,
				     DMA_BIT_MASK(ilog2(dma_addr + size)));
	*dev->dma_mask = min((*dev->dma_mask),
			     DMA_BIT_MASK(ilog2(dma_addr + size)));

	coherent = of_dma_is_coherent(np);
	dev_dbg(dev, "device is%sdma coherent\n",
		coherent ? " " : " not ");

	iommu = of_iommu_configure(dev, np);
	if (IS_ERR(iommu) && PTR_ERR(iommu) == -EPROBE_DEFER)
		return -EPROBE_DEFER;

	dev_dbg(dev, "device is%sbehind an iommu\n",
		iommu ? " " : " not ");

	arch_setup_dma_ops(dev, dma_addr, size, iommu, coherent);

	return 0;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Murali Karicheri
277
88.78%
3
42.86%
Laurent Pinchart
19
6.09%
1
14.29%
R Sricharan
15
4.81%
2
28.57%
Robin Murphy
1
0.32%
1
14.29%
Total
312
100.00%
7
100.00%


EXPORT_SYMBOL_GPL(of_dma_configure);

/**
 * of_dma_deconfigure - Clean up DMA configuration
 * @dev:        Device for which to clean up DMA configuration
 *
 * Clean up all configuration performed by of_dma_configure_ops() and free all
 * resources that have been allocated.
 */


void of_dma_deconfigure(struct device *dev)
{
	arch_teardown_dma_ops(dev);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Laurent Pinchart
15
100.00%
1
100.00%
Total
15
100.00%
1
100.00%



int of_device_register(struct platform_device *pdev)
{
	device_initialize(&pdev->dev);
	return of_device_add(pdev);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Grant C. Likely
24
100.00%
1
100.00%
Total
24
100.00%
1
100.00%


EXPORT_SYMBOL(of_device_register);



void of_device_unregister(struct platform_device *ofdev)
{
	device_unregister(&ofdev->dev);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Stephen Rothwell
17
94.44%
1
50.00%
Grant C. Likely
1
5.56%
1
50.00%
Total
18
100.00%
2
100.00%


EXPORT_SYMBOL(of_device_unregister);



const void *of_device_get_match_data(const struct device *dev)
{
	const struct of_device_id *match;

	match = of_match_device(dev->driver->of_match_table, dev);
	if (!match)
		return NULL;

	return match->data;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Joachim Eastwood
45
100.00%
1
100.00%
Total
45
100.00%
1
100.00%


EXPORT_SYMBOL(of_device_get_match_data);



static 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;

	if ((!dev) || (!dev->of_node))
		return -ENODEV;

	/* 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 repend;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Stephen Rothwell
218
87.55%
1
16.67%
Rui Zhang
18
7.23%
1
16.67%
Grant C. Likely
11
4.42%
2
33.33%
Rob Herring
2
0.80%
2
33.33%
Total
249
100.00%
6
100.00%



int of_device_request_module(struct device *dev)
{
	char *str;
	ssize_t size;
	int ret;

	size = of_device_get_modalias(dev, NULL, 0);
	if (size < 0)
		return size;

	str = kmalloc(size + 1, GFP_KERNEL);
	if (!str)
		return -ENOMEM;

	of_device_get_modalias(dev, str, size);
	str[size] = '\0';
	ret = request_module(str);
	kfree(str);

	return ret;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Stephen Boyd
91
100.00%
1
100.00%
Total
91
100.00%
1
100.00%


EXPORT_SYMBOL_GPL(of_device_request_module);

/**
 * of_device_modalias - Fill buffer with newline terminated modalias string
 */


ssize_t of_device_modalias(struct device *dev, char *str, ssize_t len)
{
	ssize_t sl = of_device_get_modalias(dev, str, len - 2);
	if (sl < 0)
		return sl;

	str[sl++] = '\n';
	str[sl] = 0;
	return sl;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Rob Herring
58
100.00%
1
100.00%
Total
58
100.00%
1
100.00%


EXPORT_SYMBOL_GPL(of_device_modalias);

/**
 * of_device_uevent - Display OF related uevent information
 */


void of_device_uevent(struct device *dev, struct kobj_uevent_env *env)
{
	const char *compat;
	struct alias_prop *app;
	int seen = 0, cplen, sl;

	if ((!dev) || (!dev->of_node))
		return;

	add_uevent_var(env, "OF_NAME=%s", dev->of_node->name);
	add_uevent_var(env, "OF_FULLNAME=%s", dev->of_node->full_name);
	if (dev->of_node->type && strcmp("<NULL>", dev->of_node->type) != 0)
		add_uevent_var(env, "OF_TYPE=%s", dev->of_node->type);

	/* 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) {
		add_uevent_var(env, "OF_COMPATIBLE_%d=%s", seen, compat);
		sl = strlen(compat) + 1;
		compat += sl;
		cplen -= sl;
		seen++;
	}
	add_uevent_var(env, "OF_COMPATIBLE_N=%d", seen);

	seen = 0;
	mutex_lock(&of_mutex);
	list_for_each_entry(app, &aliases_lookup, link) {
		if (dev->of_node == app->np) {
			add_uevent_var(env, "OF_ALIAS_%d=%s", seen,
				       app->alias);
			seen++;
		}
	}
	mutex_unlock(&of_mutex);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Grant C. Likely
172
74.46%
2
50.00%
Stepan Moskovchenko
57
24.68%
1
25.00%
Pantelis Antoniou
2
0.87%
1
25.00%
Total
231
100.00%
4
100.00%



int of_device_uevent_modalias(struct device *dev, struct kobj_uevent_env *env)
{
	int sl;

	if ((!dev) || (!dev->of_node))
		return -ENODEV;

	/* Devicetree modalias is tricky, 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;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Grant C. Likely
110
100.00%
2
100.00%
Total
110
100.00%
2
100.00%


EXPORT_SYMBOL_GPL(of_device_uevent_modalias);
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Stephen Rothwell
415
28.96%
3
9.68%
Grant C. Likely
362
25.26%
10
32.26%
Murali Karicheri
292
20.38%
3
9.68%
Stephen Boyd
101
7.05%
2
6.45%
Rob Herring
66
4.61%
2
6.45%
Stepan Moskovchenko
60
4.19%
1
3.23%
Joachim Eastwood
50
3.49%
1
3.23%
Laurent Pinchart
35
2.44%
2
6.45%
Rui Zhang
18
1.26%
1
3.23%
R Sricharan
15
1.05%
2
6.45%
Jeremy Kerr
15
1.05%
1
3.23%
Pantelis Antoniou
2
0.14%
1
3.23%
Zhen Lei
1
0.07%
1
3.23%
Robin Murphy
1
0.07%
1
3.23%
Total
1433
100.00%
31
100.00%
Directory: drivers/of

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.