drivers/base/regmap/regmap-debugfs.c - maze/linux - Git at Google

 /*
  * Register map access API - debugfs
  *
  * Copyright 2011 Wolfson Microelectronics plc
  *
  * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  */

 #include <linux/slab.h>
 #include <linux/mutex.h>
 #include <linux/debugfs.h>
 #include <linux/uaccess.h>
 #include <linux/device.h>

 #include "internal.h"

 static struct dentry *regmap_debugfs_root;

 /* Calculate the length of a fixed format  */
 static size_t regmap_calc_reg_len(int max_val, char *buf, size_t buf_size)
 {
 	snprintf(buf, buf_size, "%x", max_val);
 	return strlen(buf);
 }

 static ssize_t regmap_name_read_file(struct file *file,
 				     char __user *user_buf, size_t count,
 				     loff_t *ppos)
 {
 	struct regmap *map = file->private_data;
 	int ret;
 	char *buf;

 	buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
 	if (!buf)
 		return -ENOMEM;

 	ret = snprintf(buf, PAGE_SIZE, "%s\n", map->dev->driver->name);
 	if (ret < 0) {
 		kfree(buf);
 		return ret;
 	}

 	ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
 	kfree(buf);
 	return ret;
 }

 static const struct file_operations regmap_name_fops = {
 	.open = simple_open,
 	.read = regmap_name_read_file,
 	.llseek = default_llseek,
 };

 static ssize_t regmap_map_read_file(struct file *file, char __user *user_buf,
 				    size_t count, loff_t *ppos)
 {
 	int reg_len, val_len, tot_len;
 	size_t buf_pos = 0;
 	loff_t p = 0;
 	ssize_t ret;
 	int i;
 	struct regmap *map = file->private_data;
 	char *buf;
 	unsigned int val;

 	if (*ppos < 0 || !count)
 		return -EINVAL;

 	buf = kmalloc(count, GFP_KERNEL);
 	if (!buf)
 		return -ENOMEM;

 	/* Calculate the length of a fixed format  */
 	reg_len = regmap_calc_reg_len(map->max_register, buf, count);
 	val_len = 2 * map->format.val_bytes;
 	tot_len = reg_len + val_len + 3;      /* : \n */

 	for (i = 0; i <= map->max_register; i += map->reg_stride) {
 		if (!regmap_readable(map, i))
 			continue;

 		if (regmap_precious(map, i))
 			continue;

 		/* If we're in the region the user is trying to read */
 		if (p >= *ppos) {
 			/* ...but not beyond it */
 			if (buf_pos >= count - 1 - tot_len)
 				break;

 			/* Format the register */
 			snprintf(buf + buf_pos, count - buf_pos, "%.*x: ",
 				 reg_len, i);
 			buf_pos += reg_len + 2;

 			/* Format the value, write all X if we can't read */
 			ret = regmap_read(map, i, &val);
 			if (ret == 0)
 				snprintf(buf + buf_pos, count - buf_pos,
 					 "%.*x", val_len, val);
 			else
 				memset(buf + buf_pos, 'X', val_len);
 			buf_pos += 2 * map->format.val_bytes;

 			buf[buf_pos++] = '\n';
 		}
 		p += tot_len;
 	}

 	ret = buf_pos;

 	if (copy_to_user(user_buf, buf, buf_pos)) {
 		ret = -EFAULT;
 		goto out;
 	}

 	*ppos += buf_pos;

 out:
 	kfree(buf);
 	return ret;
 }

 #undef REGMAP_ALLOW_WRITE_DEBUGFS
 #ifdef REGMAP_ALLOW_WRITE_DEBUGFS
 /*
  * This can be dangerous especially when we have clients such as
  * PMICs, therefore don't provide any real compile time configuration option
  * for this feature, people who want to use this will need to modify
  * the source code directly.
  */
 static ssize_t regmap_map_write_file(struct file *file,
 				     const char __user *user_buf,
 				     size_t count, loff_t *ppos)
 {
 	char buf[32];
 	size_t buf_size;
 	char *start = buf;
 	unsigned long reg, value;
 	struct regmap *map = file->private_data;

 	buf_size = min(count, (sizeof(buf)-1));
 	if (copy_from_user(buf, user_buf, buf_size))
 		return -EFAULT;
 	buf[buf_size] = 0;

 	while (*start == ' ')
 		start++;
 	reg = simple_strtoul(start, &start, 16);
 	while (*start == ' ')
 		start++;
 	if (strict_strtoul(start, 16, &value))
 		return -EINVAL;

 	/* Userspace has been fiddling around behind the kernel's back */
 	add_taint(TAINT_USER);

 	regmap_write(map, reg, value);
 	return buf_size;
 }
 #else
 #define regmap_map_write_file NULL
 #endif

 static const struct file_operations regmap_map_fops = {
 	.open = simple_open,
 	.read = regmap_map_read_file,
 	.write = regmap_map_write_file,
 	.llseek = default_llseek,
 };

 static ssize_t regmap_access_read_file(struct file *file,
 				       char __user *user_buf, size_t count,
 				       loff_t *ppos)
 {
 	int reg_len, tot_len;
 	size_t buf_pos = 0;
 	loff_t p = 0;
 	ssize_t ret;
 	int i;
 	struct regmap *map = file->private_data;
 	char *buf;

 	if (*ppos < 0 || !count)
 		return -EINVAL;

 	buf = kmalloc(count, GFP_KERNEL);
 	if (!buf)
 		return -ENOMEM;

 	/* Calculate the length of a fixed format  */
 	reg_len = regmap_calc_reg_len(map->max_register, buf, count);
 	tot_len = reg_len + 10; /* ': R W V P\n' */

 	for (i = 0; i <= map->max_register; i += map->reg_stride) {
 		/* Ignore registers which are neither readable nor writable */
 		if (!regmap_readable(map, i) && !regmap_writeable(map, i))
 			continue;

 		/* If we're in the region the user is trying to read */
 		if (p >= *ppos) {
 			/* ...but not beyond it */
 			if (buf_pos >= count - 1 - tot_len)
 				break;

 			/* Format the register */
 			snprintf(buf + buf_pos, count - buf_pos,
 				 "%.*x: %c %c %c %c\n",
 				 reg_len, i,
 				 regmap_readable(map, i) ? 'y' : 'n',
 				 regmap_writeable(map, i) ? 'y' : 'n',
 				 regmap_volatile(map, i) ? 'y' : 'n',
 				 regmap_precious(map, i) ? 'y' : 'n');

 			buf_pos += tot_len;
 		}
 		p += tot_len;
 	}

 	ret = buf_pos;

 	if (copy_to_user(user_buf, buf, buf_pos)) {
 		ret = -EFAULT;
 		goto out;
 	}

 	*ppos += buf_pos;

 out:
 	kfree(buf);
 	return ret;
 }

 static const struct file_operations regmap_access_fops = {
 	.open = simple_open,
 	.read = regmap_access_read_file,
 	.llseek = default_llseek,
 };

 void regmap_debugfs_init(struct regmap *map, const char *name)
 {
 	if (name) {
 		map->debugfs_name = kasprintf(GFP_KERNEL, "%s-%s",
 					      dev_name(map->dev), name);
 		name = map->debugfs_name;
 	} else {
 		name = dev_name(map->dev);
 	}

 	map->debugfs = debugfs_create_dir(name, regmap_debugfs_root);
 	if (!map->debugfs) {
 		dev_warn(map->dev, "Failed to create debugfs directory\n");
 		return;
 	}

 	debugfs_create_file("name", 0400, map->debugfs,
 			    map, &regmap_name_fops);

 	if (map->max_register) {
 		debugfs_create_file("registers", 0400, map->debugfs,
 				    map, &regmap_map_fops);
 		debugfs_create_file("access", 0400, map->debugfs,
 				    map, &regmap_access_fops);
 	}

 	if (map->cache_type) {
 		debugfs_create_bool("cache_only", 0400, map->debugfs,
 				    &map->cache_only);
 		debugfs_create_bool("cache_dirty", 0400, map->debugfs,
 				    &map->cache_dirty);
 		debugfs_create_bool("cache_bypass", 0400, map->debugfs,
 				    &map->cache_bypass);
 	}
 }

 void regmap_debugfs_exit(struct regmap *map)
 {
 	debugfs_remove_recursive(map->debugfs);
 	kfree(map->debugfs_name);
 }

 void regmap_debugfs_initcall(void)
 {
 	regmap_debugfs_root = debugfs_create_dir("regmap", NULL);
 	if (!regmap_debugfs_root) {
 		pr_warn("regmap: Failed to create debugfs root\n");
 		return;
 	}
 }
	/*
	* Register map access API - debugfs
	*
	* Copyright 2011 Wolfson Microelectronics plc
	*
	* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*/

	#include <linux/slab.h>
	#include <linux/mutex.h>
	#include <linux/debugfs.h>
	#include <linux/uaccess.h>
	#include <linux/device.h>

	#include "internal.h"

	static struct dentry *regmap_debugfs_root;

	/* Calculate the length of a fixed format */
	static size_t regmap_calc_reg_len(int max_val, char *buf, size_t buf_size)
	{
	snprintf(buf, buf_size, "%x", max_val);
	return strlen(buf);
	}

	static ssize_t regmap_name_read_file(struct file *file,
	char __user *user_buf, size_t count,
	loff_t *ppos)
	{
	struct regmap *map = file->private_data;
	int ret;
	char *buf;

	buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
	if (!buf)
	return -ENOMEM;

	ret = snprintf(buf, PAGE_SIZE, "%s\n", map->dev->driver->name);
	if (ret < 0) {
	kfree(buf);
	return ret;
	}

	ret = simple_read_from_buffer(user_buf, count, ppos, buf, ret);
	kfree(buf);
	return ret;
	}

	static const struct file_operations regmap_name_fops = {
	.open = simple_open,
	.read = regmap_name_read_file,
	.llseek = default_llseek,
	};

	static ssize_t regmap_map_read_file(struct file file, char __user user_buf,
	size_t count, loff_t *ppos)
	{
	int reg_len, val_len, tot_len;
	size_t buf_pos = 0;
	loff_t p = 0;
	ssize_t ret;
	int i;
	struct regmap *map = file->private_data;
	char *buf;
	unsigned int val;

	if (*ppos < 0 \|\| !count)
	return -EINVAL;

	buf = kmalloc(count, GFP_KERNEL);
	if (!buf)
	return -ENOMEM;

	/* Calculate the length of a fixed format */
	reg_len = regmap_calc_reg_len(map->max_register, buf, count);
	val_len = 2 * map->format.val_bytes;
	tot_len = reg_len + val_len + 3; /* : \n */

	for (i = 0; i <= map->max_register; i += map->reg_stride) {
	if (!regmap_readable(map, i))
	continue;

	if (regmap_precious(map, i))
	continue;

	/* If we're in the region the user is trying to read */
	if (p >= *ppos) {
	/* ...but not beyond it */
	if (buf_pos >= count - 1 - tot_len)
	break;

	/* Format the register */
	snprintf(buf + buf_pos, count - buf_pos, "%.*x: ",
	reg_len, i);
	buf_pos += reg_len + 2;

	/* Format the value, write all X if we can't read */
	ret = regmap_read(map, i, &val);
	if (ret == 0)
	snprintf(buf + buf_pos, count - buf_pos,
	"%.*x", val_len, val);
	else
	memset(buf + buf_pos, 'X', val_len);
	buf_pos += 2 * map->format.val_bytes;

	buf[buf_pos++] = '\n';
	}
	p += tot_len;
	}

	ret = buf_pos;

	if (copy_to_user(user_buf, buf, buf_pos)) {
	ret = -EFAULT;
	goto out;
	}

	*ppos += buf_pos;

	out:
	kfree(buf);
	return ret;
	}

	#undef REGMAP_ALLOW_WRITE_DEBUGFS
	#ifdef REGMAP_ALLOW_WRITE_DEBUGFS
	/*
	* This can be dangerous especially when we have clients such as
	* PMICs, therefore don't provide any real compile time configuration option
	* for this feature, people who want to use this will need to modify
	* the source code directly.
	*/
	static ssize_t regmap_map_write_file(struct file *file,
	const char __user *user_buf,
	size_t count, loff_t *ppos)
	{
	char buf[32];
	size_t buf_size;
	char *start = buf;
	unsigned long reg, value;
	struct regmap *map = file->private_data;

	buf_size = min(count, (sizeof(buf)-1));
	if (copy_from_user(buf, user_buf, buf_size))
	return -EFAULT;
	buf[buf_size] = 0;

	while (*start == ' ')
	start++;
	reg = simple_strtoul(start, &start, 16);
	while (*start == ' ')
	start++;
	if (strict_strtoul(start, 16, &value))
	return -EINVAL;

	/* Userspace has been fiddling around behind the kernel's back */
	add_taint(TAINT_USER);

	regmap_write(map, reg, value);
	return buf_size;
	}
	#else
	#define regmap_map_write_file NULL
	#endif

	static const struct file_operations regmap_map_fops = {
	.open = simple_open,
	.read = regmap_map_read_file,
	.write = regmap_map_write_file,
	.llseek = default_llseek,
	};

	static ssize_t regmap_access_read_file(struct file *file,
	char __user *user_buf, size_t count,
	loff_t *ppos)
	{
	int reg_len, tot_len;
	size_t buf_pos = 0;
	loff_t p = 0;
	ssize_t ret;
	int i;
	struct regmap *map = file->private_data;
	char *buf;

	if (*ppos < 0 \|\| !count)
	return -EINVAL;

	buf = kmalloc(count, GFP_KERNEL);
	if (!buf)
	return -ENOMEM;

	/* Calculate the length of a fixed format */
	reg_len = regmap_calc_reg_len(map->max_register, buf, count);
	tot_len = reg_len + 10; /* ': R W V P\n' */

	for (i = 0; i <= map->max_register; i += map->reg_stride) {
	/* Ignore registers which are neither readable nor writable */
	if (!regmap_readable(map, i) && !regmap_writeable(map, i))
	continue;

	/* If we're in the region the user is trying to read */
	if (p >= *ppos) {
	/* ...but not beyond it */
	if (buf_pos >= count - 1 - tot_len)
	break;

	/* Format the register */
	snprintf(buf + buf_pos, count - buf_pos,
	"%.*x: %c %c %c %c\n",
	reg_len, i,
	regmap_readable(map, i) ? 'y' : 'n',
	regmap_writeable(map, i) ? 'y' : 'n',
	regmap_volatile(map, i) ? 'y' : 'n',
	regmap_precious(map, i) ? 'y' : 'n');

	buf_pos += tot_len;
	}
	p += tot_len;
	}

	ret = buf_pos;

	if (copy_to_user(user_buf, buf, buf_pos)) {
	ret = -EFAULT;
	goto out;
	}

	*ppos += buf_pos;

	out:
	kfree(buf);
	return ret;
	}

	static const struct file_operations regmap_access_fops = {
	.open = simple_open,
	.read = regmap_access_read_file,
	.llseek = default_llseek,
	};

	void regmap_debugfs_init(struct regmap map, const char name)
	{
	if (name) {
	map->debugfs_name = kasprintf(GFP_KERNEL, "%s-%s",
	dev_name(map->dev), name);
	name = map->debugfs_name;
	} else {
	name = dev_name(map->dev);
	}

	map->debugfs = debugfs_create_dir(name, regmap_debugfs_root);
	if (!map->debugfs) {
	dev_warn(map->dev, "Failed to create debugfs directory\n");
	return;
	}

	debugfs_create_file("name", 0400, map->debugfs,
	map, &regmap_name_fops);

	if (map->max_register) {
	debugfs_create_file("registers", 0400, map->debugfs,
	map, &regmap_map_fops);
	debugfs_create_file("access", 0400, map->debugfs,
	map, &regmap_access_fops);
	}

	if (map->cache_type) {
	debugfs_create_bool("cache_only", 0400, map->debugfs,
	&map->cache_only);
	debugfs_create_bool("cache_dirty", 0400, map->debugfs,
	&map->cache_dirty);
	debugfs_create_bool("cache_bypass", 0400, map->debugfs,
	&map->cache_bypass);
	}
	}

	void regmap_debugfs_exit(struct regmap *map)
	{
	debugfs_remove_recursive(map->debugfs);
	kfree(map->debugfs_name);
	}

	void regmap_debugfs_initcall(void)
	{
	regmap_debugfs_root = debugfs_create_dir("regmap", NULL);
	if (!regmap_debugfs_root) {
	pr_warn("regmap: Failed to create debugfs root\n");
	return;
	}
	}