drivers/mfd/ab8500-debugfs.c - kernel/msm-4.9 - Gitiles

 /*
  * Copyright (C) ST-Ericsson SA 2010
  *
  * Author: Mattias Wallin <mattias.wallin@stericsson.com> for ST-Ericsson.
  * License Terms: GNU General Public License v2
  */

 #include <linux/seq_file.h>
 #include <linux/uaccess.h>
 #include <linux/fs.h>
 #include <linux/module.h>
 #include <linux/debugfs.h>
 #include <linux/platform_device.h>

 #include <linux/mfd/abx500.h>
 #include <linux/mfd/ab8500.h>

 static u32 debug_bank;
 static u32 debug_address;

 /**
  * struct ab8500_reg_range
  * @first: the first address of the range
  * @last: the last address of the range
  * @perm: access permissions for the range
  */
 struct ab8500_reg_range {
 	u8 first;
 	u8 last;
 	u8 perm;
 };

 /**
  * struct ab8500_i2c_ranges
  * @num_ranges: the number of ranges in the list
  * @bankid: bank identifier
  * @range: the list of register ranges
  */
 struct ab8500_i2c_ranges {
 	u8 num_ranges;
 	u8 bankid;
 	const struct ab8500_reg_range *range;
 };

 #define AB8500_NAME_STRING "ab8500"
 #define AB8500_NUM_BANKS 22

 #define AB8500_REV_REG 0x80

 static struct ab8500_i2c_ranges debug_ranges[AB8500_NUM_BANKS] = {
 	[0x0] = {
 		.num_ranges = 0,
 		.range = 0,
 	},
 	[AB8500_SYS_CTRL1_BLOCK] = {
 		.num_ranges = 3,
 		.range = (struct ab8500_reg_range[]) {
 			{
 				.first = 0x00,
 				.last = 0x02,
 			},
 			{
 				.first = 0x42,
 				.last = 0x42,
 			},
 			{
 				.first = 0x80,
 				.last = 0x81,
 			},
 		},
 	},
 	[AB8500_SYS_CTRL2_BLOCK] = {
 		.num_ranges = 4,
 		.range = (struct ab8500_reg_range[]) {
 			{
 				.first = 0x00,
 				.last = 0x0D,
 			},
 			{
 				.first = 0x0F,
 				.last = 0x17,
 			},
 			{
 				.first = 0x30,
 				.last = 0x30,
 			},
 			{
 				.first = 0x32,
 				.last = 0x33,
 			},
 		},
 	},
 	[AB8500_REGU_CTRL1] = {
 		.num_ranges = 3,
 		.range = (struct ab8500_reg_range[]) {
 			{
 				.first = 0x00,
 				.last = 0x00,
 			},
 			{
 				.first = 0x03,
 				.last = 0x10,
 			},
 			{
 				.first = 0x80,
 				.last = 0x84,
 			},
 		},
 	},
 	[AB8500_REGU_CTRL2] = {
 		.num_ranges = 5,
 		.range = (struct ab8500_reg_range[]) {
 			{
 				.first = 0x00,
 				.last = 0x15,
 			},
 			{
 				.first = 0x17,
 				.last = 0x19,
 			},
 			{
 				.first = 0x1B,
 				.last = 0x1D,
 			},
 			{
 				.first = 0x1F,
 				.last = 0x22,
 			},
 			{
 				.first = 0x40,
 				.last = 0x44,
 			},
 			/* 0x80-0x8B is SIM registers and should
 			 * not be accessed from here */
 		},
 	},
 	[AB8500_USB] = {
 		.num_ranges = 2,
 		.range = (struct ab8500_reg_range[]) {
 			{
 				.first = 0x80,
 				.last = 0x83,
 			},
 			{
 				.first = 0x87,
 				.last = 0x8A,
 			},
 		},
 	},
 	[AB8500_TVOUT] = {
 		.num_ranges = 9,
 		.range = (struct ab8500_reg_range[]) {
 			{
 				.first = 0x00,
 				.last = 0x12,
 			},
 			{
 				.first = 0x15,
 				.last = 0x17,
 			},
 			{
 				.first = 0x19,
 				.last = 0x21,
 			},
 			{
 				.first = 0x27,
 				.last = 0x2C,
 			},
 			{
 				.first = 0x41,
 				.last = 0x41,
 			},
 			{
 				.first = 0x45,
 				.last = 0x5B,
 			},
 			{
 				.first = 0x5D,
 				.last = 0x5D,
 			},
 			{
 				.first = 0x69,
 				.last = 0x69,
 			},
 			{
 				.first = 0x80,
 				.last = 0x81,
 			},
 		},
 	},
 	[AB8500_DBI] = {
 		.num_ranges = 0,
 		.range = NULL,
 	},
 	[AB8500_ECI_AV_ACC] = {
 		.num_ranges = 1,
 		.range = (struct ab8500_reg_range[]) {
 			{
 				.first = 0x80,
 				.last = 0x82,
 			},
 		},
 	},
 	[0x9] = {
 		.num_ranges = 0,
 		.range = NULL,
 	},
 	[AB8500_GPADC] = {
 		.num_ranges = 1,
 		.range = (struct ab8500_reg_range[]) {
 			{
 				.first = 0x00,
 				.last = 0x08,
 			},
 		},
 	},
 	[AB8500_CHARGER] = {
 		.num_ranges = 8,
 		.range = (struct ab8500_reg_range[]) {
 			{
 				.first = 0x00,
 				.last = 0x03,
 			},
 			{
 				.first = 0x05,
 				.last = 0x05,
 			},
 			{
 				.first = 0x40,
 				.last = 0x40,
 			},
 			{
 				.first = 0x42,
 				.last = 0x42,
 			},
 			{
 				.first = 0x44,
 				.last = 0x44,
 			},
 			{
 				.first = 0x50,
 				.last = 0x55,
 			},
 			{
 				.first = 0x80,
 				.last = 0x82,
 			},
 			{
 				.first = 0xC0,
 				.last = 0xC2,
 			},
 		},
 	},
 	[AB8500_GAS_GAUGE] = {
 		.num_ranges = 3,
 		.range = (struct ab8500_reg_range[]) {
 			{
 				.first = 0x00,
 				.last = 0x00,
 			},
 			{
 				.first = 0x07,
 				.last = 0x0A,
 			},
 			{
 				.first = 0x10,
 				.last = 0x14,
 			},
 		},
 	},
 	[AB8500_AUDIO] = {
 		.num_ranges = 1,
 		.range = (struct ab8500_reg_range[]) {
 			{
 				.first = 0x00,
 				.last = 0x6F,
 			},
 		},
 	},
 	[AB8500_INTERRUPT] = {
 		.num_ranges = 0,
 		.range = NULL,
 	},
 	[AB8500_RTC] = {
 		.num_ranges = 1,
 		.range = (struct ab8500_reg_range[]) {
 			{
 				.first = 0x00,
 				.last = 0x0F,
 			},
 		},
 	},
 	[AB8500_MISC] = {
 		.num_ranges = 8,
 		.range = (struct ab8500_reg_range[]) {
 			{
 				.first = 0x00,
 				.last = 0x05,
 			},
 			{
 				.first = 0x10,
 				.last = 0x15,
 			},
 			{
 				.first = 0x20,
 				.last = 0x25,
 			},
 			{
 				.first = 0x30,
 				.last = 0x35,
 			},
 			{
 				.first = 0x40,
 				.last = 0x45,
 			},
 			{
 				.first = 0x50,
 				.last = 0x50,
 			},
 			{
 				.first = 0x60,
 				.last = 0x67,
 			},
 			{
 				.first = 0x80,
 				.last = 0x80,
 			},
 		},
 	},
 	[0x11] = {
 		.num_ranges = 0,
 		.range = NULL,
 	},
 	[0x12] = {
 		.num_ranges = 0,
 		.range = NULL,
 	},
 	[0x13] = {
 		.num_ranges = 0,
 		.range = NULL,
 	},
 	[0x14] = {
 		.num_ranges = 0,
 		.range = NULL,
 	},
 	[AB8500_OTP_EMUL] = {
 		.num_ranges = 1,
 		.range = (struct ab8500_reg_range[]) {
 			{
 				.first = 0x01,
 				.last = 0x0F,
 			},
 		},
 	},
 };

 static int ab8500_registers_print(struct seq_file *s, void *p)
 {
 	struct device *dev = s->private;
 	unsigned int i;
 	u32 bank = debug_bank;

 	seq_printf(s, AB8500_NAME_STRING " register values:\n");

 	seq_printf(s, " bank %u:\n", bank);
 	for (i = 0; i < debug_ranges[bank].num_ranges; i++) {
 		u32 reg;

 		for (reg = debug_ranges[bank].range[i].first;
 			reg <= debug_ranges[bank].range[i].last;
 			reg++) {
 			u8 value;
 			int err;

 			err = abx500_get_register_interruptible(dev,
 				(u8)bank, (u8)reg, &value);
 			if (err < 0) {
 				dev_err(dev, "ab->read fail %d\n", err);
 				return err;
 			}

 			err = seq_printf(s, "  [%u/0x%02X]: 0x%02X\n", bank,
 				reg, value);
 			if (err < 0) {
 				dev_err(dev, "seq_printf overflow\n");
 				/* Error is not returned here since
 				 * the output is wanted in any case */
 				return 0;
 			}
 		}
 	}
 	return 0;
 }

 static int ab8500_registers_open(struct inode *inode, struct file *file)
 {
 	return single_open(file, ab8500_registers_print, inode->i_private);
 }

 static const struct file_operations ab8500_registers_fops = {
 	.open = ab8500_registers_open,
 	.read = seq_read,
 	.llseek = seq_lseek,
 	.release = single_release,
 	.owner = THIS_MODULE,
 };

 static int ab8500_bank_print(struct seq_file *s, void *p)
 {
 	return seq_printf(s, "%d\n", debug_bank);
 }

 static int ab8500_bank_open(struct inode *inode, struct file *file)
 {
 	return single_open(file, ab8500_bank_print, inode->i_private);
 }

 static ssize_t ab8500_bank_write(struct file *file,
 	const char __user *user_buf,
 	size_t count, loff_t *ppos)
 {
 	struct device *dev = ((struct seq_file *)(file->private_data))->private;
 	unsigned long user_bank;
 	int err;

 	/* Get userspace string and assure termination */
 	err = kstrtoul_from_user(user_buf, count, 0, &user_bank);
 	if (err)
 		return err;

 	if (user_bank >= AB8500_NUM_BANKS) {
 		dev_err(dev, "debugfs error input > number of banks\n");
 		return -EINVAL;
 	}

 	debug_bank = user_bank;

 	return count;
 }

 static int ab8500_address_print(struct seq_file *s, void *p)
 {
 	return seq_printf(s, "0x%02X\n", debug_address);
 }

 static int ab8500_address_open(struct inode *inode, struct file *file)
 {
 	return single_open(file, ab8500_address_print, inode->i_private);
 }

 static ssize_t ab8500_address_write(struct file *file,
 	const char __user *user_buf,
 	size_t count, loff_t *ppos)
 {
 	struct device *dev = ((struct seq_file *)(file->private_data))->private;
 	unsigned long user_address;
 	int err;

 	/* Get userspace string and assure termination */
 	err = kstrtoul_from_user(user_buf, count, 0, &user_address);
 	if (err)
 		return err;

 	if (user_address > 0xff) {
 		dev_err(dev, "debugfs error input > 0xff\n");
 		return -EINVAL;
 	}
 	debug_address = user_address;
 	return count;
 }

 static int ab8500_val_print(struct seq_file *s, void *p)
 {
 	struct device *dev = s->private;
 	int ret;
 	u8 regvalue;

 	ret = abx500_get_register_interruptible(dev,
 		(u8)debug_bank, (u8)debug_address, &regvalue);
 	if (ret < 0) {
 		dev_err(dev, "abx500_get_reg fail %d, %d\n",
 			ret, __LINE__);
 		return -EINVAL;
 	}
 	seq_printf(s, "0x%02X\n", regvalue);

 	return 0;
 }

 static int ab8500_val_open(struct inode *inode, struct file *file)
 {
 	return single_open(file, ab8500_val_print, inode->i_private);
 }

 static ssize_t ab8500_val_write(struct file *file,
 	const char __user *user_buf,
 	size_t count, loff_t *ppos)
 {
 	struct device *dev = ((struct seq_file *)(file->private_data))->private;
 	unsigned long user_val;
 	int err;

 	/* Get userspace string and assure termination */
 	err = kstrtoul_from_user(user_buf, count, 0, &user_val);
 	if (err)
 		return err;

 	if (user_val > 0xff) {
 		dev_err(dev, "debugfs error input > 0xff\n");
 		return -EINVAL;
 	}
 	err = abx500_set_register_interruptible(dev,
 		(u8)debug_bank, debug_address, (u8)user_val);
 	if (err < 0) {
 		printk(KERN_ERR "abx500_set_reg failed %d, %d", err, __LINE__);
 		return -EINVAL;
 	}

 	return count;
 }

 static const struct file_operations ab8500_bank_fops = {
 	.open = ab8500_bank_open,
 	.write = ab8500_bank_write,
 	.read = seq_read,
 	.llseek = seq_lseek,
 	.release = single_release,
 	.owner = THIS_MODULE,
 };

 static const struct file_operations ab8500_address_fops = {
 	.open = ab8500_address_open,
 	.write = ab8500_address_write,
 	.read = seq_read,
 	.llseek = seq_lseek,
 	.release = single_release,
 	.owner = THIS_MODULE,
 };

 static const struct file_operations ab8500_val_fops = {
 	.open = ab8500_val_open,
 	.write = ab8500_val_write,
 	.read = seq_read,
 	.llseek = seq_lseek,
 	.release = single_release,
 	.owner = THIS_MODULE,
 };

 static struct dentry *ab8500_dir;
 static struct dentry *ab8500_reg_file;
 static struct dentry *ab8500_bank_file;
 static struct dentry *ab8500_address_file;
 static struct dentry *ab8500_val_file;

 static int __devinit ab8500_debug_probe(struct platform_device *plf)
 {
 	debug_bank = AB8500_MISC;
 	debug_address = AB8500_REV_REG & 0x00FF;

 	ab8500_dir = debugfs_create_dir(AB8500_NAME_STRING, NULL);
 	if (!ab8500_dir)
 		goto exit_no_debugfs;

 	ab8500_reg_file = debugfs_create_file("all-bank-registers",
 		S_IRUGO, ab8500_dir, &plf->dev, &ab8500_registers_fops);
 	if (!ab8500_reg_file)
 		goto exit_destroy_dir;

 	ab8500_bank_file = debugfs_create_file("register-bank",
 		(S_IRUGO | S_IWUSR), ab8500_dir, &plf->dev, &ab8500_bank_fops);
 	if (!ab8500_bank_file)
 		goto exit_destroy_reg;

 	ab8500_address_file = debugfs_create_file("register-address",
 		(S_IRUGO | S_IWUSR), ab8500_dir, &plf->dev,
 		&ab8500_address_fops);
 	if (!ab8500_address_file)
 		goto exit_destroy_bank;

 	ab8500_val_file = debugfs_create_file("register-value",
 		(S_IRUGO | S_IWUSR), ab8500_dir, &plf->dev, &ab8500_val_fops);
 	if (!ab8500_val_file)
 		goto exit_destroy_address;

 	return 0;

 exit_destroy_address:
 	debugfs_remove(ab8500_address_file);
 exit_destroy_bank:
 	debugfs_remove(ab8500_bank_file);
 exit_destroy_reg:
 	debugfs_remove(ab8500_reg_file);
 exit_destroy_dir:
 	debugfs_remove(ab8500_dir);
 exit_no_debugfs:
 	dev_err(&plf->dev, "failed to create debugfs entries.\n");
 	return -ENOMEM;
 }

 static int __devexit ab8500_debug_remove(struct platform_device *plf)
 {
 	debugfs_remove(ab8500_val_file);
 	debugfs_remove(ab8500_address_file);
 	debugfs_remove(ab8500_bank_file);
 	debugfs_remove(ab8500_reg_file);
 	debugfs_remove(ab8500_dir);

 	return 0;
 }

 static struct platform_driver ab8500_debug_driver = {
 	.driver = {
 		.name = "ab8500-debug",
 		.owner = THIS_MODULE,
 	},
 	.probe  = ab8500_debug_probe,
 	.remove = __devexit_p(ab8500_debug_remove)
 };

 static int __init ab8500_debug_init(void)
 {
 	return platform_driver_register(&ab8500_debug_driver);
 }

 static void __exit ab8500_debug_exit(void)
 {
 	platform_driver_unregister(&ab8500_debug_driver);
 }
 subsys_initcall(ab8500_debug_init);
 module_exit(ab8500_debug_exit);

 MODULE_AUTHOR("Mattias WALLIN <mattias.wallin@stericsson.com");
 MODULE_DESCRIPTION("AB8500 DEBUG");
 MODULE_LICENSE("GPL v2");
	/*
	* Copyright (C) ST-Ericsson SA 2010
	*
	* Author: Mattias Wallin <mattias.wallin@stericsson.com> for ST-Ericsson.
	* License Terms: GNU General Public License v2
	*/

	#include <linux/seq_file.h>
	#include <linux/uaccess.h>
	#include <linux/fs.h>
	#include <linux/module.h>
	#include <linux/debugfs.h>
	#include <linux/platform_device.h>

	#include <linux/mfd/abx500.h>
	#include <linux/mfd/ab8500.h>

	static u32 debug_bank;
	static u32 debug_address;

	/**
	* struct ab8500_reg_range
	* @first: the first address of the range
	* @last: the last address of the range
	* @perm: access permissions for the range
	*/
	struct ab8500_reg_range {
	u8 first;
	u8 last;
	u8 perm;
	};

	/**
	* struct ab8500_i2c_ranges
	* @num_ranges: the number of ranges in the list
	* @bankid: bank identifier
	* @range: the list of register ranges
	*/
	struct ab8500_i2c_ranges {
	u8 num_ranges;
	u8 bankid;
	const struct ab8500_reg_range *range;
	};

	#define AB8500_NAME_STRING "ab8500"
	#define AB8500_NUM_BANKS 22

	#define AB8500_REV_REG 0x80

	static struct ab8500_i2c_ranges debug_ranges[AB8500_NUM_BANKS] = {
	[0x0] = {
	.num_ranges = 0,
	.range = 0,
	},
	[AB8500_SYS_CTRL1_BLOCK] = {
	.num_ranges = 3,
	.range = (struct ab8500_reg_range[]) {
	{
	.first = 0x00,
	.last = 0x02,
	},
	{
	.first = 0x42,
	.last = 0x42,
	},
	{
	.first = 0x80,
	.last = 0x81,
	},
	},
	},
	[AB8500_SYS_CTRL2_BLOCK] = {
	.num_ranges = 4,
	.range = (struct ab8500_reg_range[]) {
	{
	.first = 0x00,
	.last = 0x0D,
	},
	{
	.first = 0x0F,
	.last = 0x17,
	},
	{
	.first = 0x30,
	.last = 0x30,
	},
	{
	.first = 0x32,
	.last = 0x33,
	},
	},
	},
	[AB8500_REGU_CTRL1] = {
	.num_ranges = 3,
	.range = (struct ab8500_reg_range[]) {
	{
	.first = 0x00,
	.last = 0x00,
	},
	{
	.first = 0x03,
	.last = 0x10,
	},
	{
	.first = 0x80,
	.last = 0x84,
	},
	},
	},
	[AB8500_REGU_CTRL2] = {
	.num_ranges = 5,
	.range = (struct ab8500_reg_range[]) {
	{
	.first = 0x00,
	.last = 0x15,
	},
	{
	.first = 0x17,
	.last = 0x19,
	},
	{
	.first = 0x1B,
	.last = 0x1D,
	},
	{
	.first = 0x1F,
	.last = 0x22,
	},
	{
	.first = 0x40,
	.last = 0x44,
	},
	/* 0x80-0x8B is SIM registers and should
	* not be accessed from here */
	},
	},
	[AB8500_USB] = {
	.num_ranges = 2,
	.range = (struct ab8500_reg_range[]) {
	{
	.first = 0x80,
	.last = 0x83,
	},
	{
	.first = 0x87,
	.last = 0x8A,
	},
	},
	},
	[AB8500_TVOUT] = {
	.num_ranges = 9,
	.range = (struct ab8500_reg_range[]) {
	{
	.first = 0x00,
	.last = 0x12,
	},
	{
	.first = 0x15,
	.last = 0x17,
	},
	{
	.first = 0x19,
	.last = 0x21,
	},
	{
	.first = 0x27,
	.last = 0x2C,
	},
	{
	.first = 0x41,
	.last = 0x41,
	},
	{
	.first = 0x45,
	.last = 0x5B,
	},
	{
	.first = 0x5D,
	.last = 0x5D,
	},
	{
	.first = 0x69,
	.last = 0x69,
	},
	{
	.first = 0x80,
	.last = 0x81,
	},
	},
	},
	[AB8500_DBI] = {
	.num_ranges = 0,
	.range = NULL,
	},
	[AB8500_ECI_AV_ACC] = {
	.num_ranges = 1,
	.range = (struct ab8500_reg_range[]) {
	{
	.first = 0x80,
	.last = 0x82,
	},
	},
	},
	[0x9] = {
	.num_ranges = 0,
	.range = NULL,
	},
	[AB8500_GPADC] = {
	.num_ranges = 1,
	.range = (struct ab8500_reg_range[]) {
	{
	.first = 0x00,
	.last = 0x08,
	},
	},
	},
	[AB8500_CHARGER] = {
	.num_ranges = 8,
	.range = (struct ab8500_reg_range[]) {
	{
	.first = 0x00,
	.last = 0x03,
	},
	{
	.first = 0x05,
	.last = 0x05,
	},
	{
	.first = 0x40,
	.last = 0x40,
	},
	{
	.first = 0x42,
	.last = 0x42,
	},
	{
	.first = 0x44,
	.last = 0x44,
	},
	{
	.first = 0x50,
	.last = 0x55,
	},
	{
	.first = 0x80,
	.last = 0x82,
	},
	{
	.first = 0xC0,
	.last = 0xC2,
	},
	},
	},
	[AB8500_GAS_GAUGE] = {
	.num_ranges = 3,
	.range = (struct ab8500_reg_range[]) {
	{
	.first = 0x00,
	.last = 0x00,
	},
	{
	.first = 0x07,
	.last = 0x0A,
	},
	{
	.first = 0x10,
	.last = 0x14,
	},
	},
	},
	[AB8500_AUDIO] = {
	.num_ranges = 1,
	.range = (struct ab8500_reg_range[]) {
	{
	.first = 0x00,
	.last = 0x6F,
	},
	},
	},
	[AB8500_INTERRUPT] = {
	.num_ranges = 0,
	.range = NULL,
	},
	[AB8500_RTC] = {
	.num_ranges = 1,
	.range = (struct ab8500_reg_range[]) {
	{
	.first = 0x00,
	.last = 0x0F,
	},
	},
	},
	[AB8500_MISC] = {
	.num_ranges = 8,
	.range = (struct ab8500_reg_range[]) {
	{
	.first = 0x00,
	.last = 0x05,
	},
	{
	.first = 0x10,
	.last = 0x15,
	},
	{
	.first = 0x20,
	.last = 0x25,
	},
	{
	.first = 0x30,
	.last = 0x35,
	},
	{
	.first = 0x40,
	.last = 0x45,
	},
	{
	.first = 0x50,
	.last = 0x50,
	},
	{
	.first = 0x60,
	.last = 0x67,
	},
	{
	.first = 0x80,
	.last = 0x80,
	},
	},
	},
	[0x11] = {
	.num_ranges = 0,
	.range = NULL,
	},
	[0x12] = {
	.num_ranges = 0,
	.range = NULL,
	},
	[0x13] = {
	.num_ranges = 0,
	.range = NULL,
	},
	[0x14] = {
	.num_ranges = 0,
	.range = NULL,
	},
	[AB8500_OTP_EMUL] = {
	.num_ranges = 1,
	.range = (struct ab8500_reg_range[]) {
	{
	.first = 0x01,
	.last = 0x0F,
	},
	},
	},
	};

	static int ab8500_registers_print(struct seq_file s, void p)
	{
	struct device *dev = s->private;
	unsigned int i;
	u32 bank = debug_bank;

	seq_printf(s, AB8500_NAME_STRING " register values:\n");

	seq_printf(s, " bank %u:\n", bank);
	for (i = 0; i < debug_ranges[bank].num_ranges; i++) {
	u32 reg;

	for (reg = debug_ranges[bank].range[i].first;
	reg <= debug_ranges[bank].range[i].last;
	reg++) {
	u8 value;
	int err;

	err = abx500_get_register_interruptible(dev,
	(u8)bank, (u8)reg, &value);
	if (err < 0) {
	dev_err(dev, "ab->read fail %d\n", err);
	return err;
	}

	err = seq_printf(s, " [%u/0x%02X]: 0x%02X\n", bank,
	reg, value);
	if (err < 0) {
	dev_err(dev, "seq_printf overflow\n");
	/* Error is not returned here since
	* the output is wanted in any case */
	return 0;
	}
	}
	}
	return 0;
	}

	static int ab8500_registers_open(struct inode inode, struct file file)
	{
	return single_open(file, ab8500_registers_print, inode->i_private);
	}

	static const struct file_operations ab8500_registers_fops = {
	.open = ab8500_registers_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
	.owner = THIS_MODULE,
	};

	static int ab8500_bank_print(struct seq_file s, void p)
	{
	return seq_printf(s, "%d\n", debug_bank);
	}

	static int ab8500_bank_open(struct inode inode, struct file file)
	{
	return single_open(file, ab8500_bank_print, inode->i_private);
	}

	static ssize_t ab8500_bank_write(struct file *file,
	const char __user *user_buf,
	size_t count, loff_t *ppos)
	{
	struct device dev = ((struct seq_file )(file->private_data))->private;
	unsigned long user_bank;
	int err;

	/* Get userspace string and assure termination */
	err = kstrtoul_from_user(user_buf, count, 0, &user_bank);
	if (err)
	return err;

	if (user_bank >= AB8500_NUM_BANKS) {
	dev_err(dev, "debugfs error input > number of banks\n");
	return -EINVAL;
	}

	debug_bank = user_bank;

	return count;
	}

	static int ab8500_address_print(struct seq_file s, void p)
	{
	return seq_printf(s, "0x%02X\n", debug_address);
	}

	static int ab8500_address_open(struct inode inode, struct file file)
	{
	return single_open(file, ab8500_address_print, inode->i_private);
	}

	static ssize_t ab8500_address_write(struct file *file,
	const char __user *user_buf,
	size_t count, loff_t *ppos)
	{
	struct device dev = ((struct seq_file )(file->private_data))->private;
	unsigned long user_address;
	int err;

	/* Get userspace string and assure termination */
	err = kstrtoul_from_user(user_buf, count, 0, &user_address);
	if (err)
	return err;

	if (user_address > 0xff) {
	dev_err(dev, "debugfs error input > 0xff\n");
	return -EINVAL;
	}
	debug_address = user_address;
	return count;
	}

	static int ab8500_val_print(struct seq_file s, void p)
	{
	struct device *dev = s->private;
	int ret;
	u8 regvalue;

	ret = abx500_get_register_interruptible(dev,
	(u8)debug_bank, (u8)debug_address, &regvalue);
	if (ret < 0) {
	dev_err(dev, "abx500_get_reg fail %d, %d\n",
	ret, __LINE__);
	return -EINVAL;
	}
	seq_printf(s, "0x%02X\n", regvalue);

	return 0;
	}

	static int ab8500_val_open(struct inode inode, struct file file)
	{
	return single_open(file, ab8500_val_print, inode->i_private);
	}

	static ssize_t ab8500_val_write(struct file *file,
	const char __user *user_buf,
	size_t count, loff_t *ppos)
	{
	struct device dev = ((struct seq_file )(file->private_data))->private;
	unsigned long user_val;
	int err;

	/* Get userspace string and assure termination */
	err = kstrtoul_from_user(user_buf, count, 0, &user_val);
	if (err)
	return err;

	if (user_val > 0xff) {
	dev_err(dev, "debugfs error input > 0xff\n");
	return -EINVAL;
	}
	err = abx500_set_register_interruptible(dev,
	(u8)debug_bank, debug_address, (u8)user_val);
	if (err < 0) {
	printk(KERN_ERR "abx500_set_reg failed %d, %d", err, __LINE__);
	return -EINVAL;
	}

	return count;
	}

	static const struct file_operations ab8500_bank_fops = {
	.open = ab8500_bank_open,
	.write = ab8500_bank_write,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
	.owner = THIS_MODULE,
	};

	static const struct file_operations ab8500_address_fops = {
	.open = ab8500_address_open,
	.write = ab8500_address_write,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
	.owner = THIS_MODULE,
	};

	static const struct file_operations ab8500_val_fops = {
	.open = ab8500_val_open,
	.write = ab8500_val_write,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
	.owner = THIS_MODULE,
	};

	static struct dentry *ab8500_dir;
	static struct dentry *ab8500_reg_file;
	static struct dentry *ab8500_bank_file;
	static struct dentry *ab8500_address_file;
	static struct dentry *ab8500_val_file;

	static int __devinit ab8500_debug_probe(struct platform_device *plf)
	{
	debug_bank = AB8500_MISC;
	debug_address = AB8500_REV_REG & 0x00FF;

	ab8500_dir = debugfs_create_dir(AB8500_NAME_STRING, NULL);
	if (!ab8500_dir)
	goto exit_no_debugfs;

	ab8500_reg_file = debugfs_create_file("all-bank-registers",
	S_IRUGO, ab8500_dir, &plf->dev, &ab8500_registers_fops);
	if (!ab8500_reg_file)
	goto exit_destroy_dir;

	ab8500_bank_file = debugfs_create_file("register-bank",
	(S_IRUGO \| S_IWUSR), ab8500_dir, &plf->dev, &ab8500_bank_fops);
	if (!ab8500_bank_file)
	goto exit_destroy_reg;

	ab8500_address_file = debugfs_create_file("register-address",
	(S_IRUGO \| S_IWUSR), ab8500_dir, &plf->dev,
	&ab8500_address_fops);
	if (!ab8500_address_file)
	goto exit_destroy_bank;

	ab8500_val_file = debugfs_create_file("register-value",
	(S_IRUGO \| S_IWUSR), ab8500_dir, &plf->dev, &ab8500_val_fops);
	if (!ab8500_val_file)
	goto exit_destroy_address;

	return 0;

	exit_destroy_address:
	debugfs_remove(ab8500_address_file);
	exit_destroy_bank:
	debugfs_remove(ab8500_bank_file);
	exit_destroy_reg:
	debugfs_remove(ab8500_reg_file);
	exit_destroy_dir:
	debugfs_remove(ab8500_dir);
	exit_no_debugfs:
	dev_err(&plf->dev, "failed to create debugfs entries.\n");
	return -ENOMEM;
	}

	static int __devexit ab8500_debug_remove(struct platform_device *plf)
	{
	debugfs_remove(ab8500_val_file);
	debugfs_remove(ab8500_address_file);
	debugfs_remove(ab8500_bank_file);
	debugfs_remove(ab8500_reg_file);
	debugfs_remove(ab8500_dir);

	return 0;
	}

	static struct platform_driver ab8500_debug_driver = {
	.driver = {
	.name = "ab8500-debug",
	.owner = THIS_MODULE,
	},
	.probe = ab8500_debug_probe,
	.remove = __devexit_p(ab8500_debug_remove)
	};

	static int __init ab8500_debug_init(void)
	{
	return platform_driver_register(&ab8500_debug_driver);
	}

	static void __exit ab8500_debug_exit(void)
	{
	platform_driver_unregister(&ab8500_debug_driver);
	}
	subsys_initcall(ab8500_debug_init);
	module_exit(ab8500_debug_exit);

	MODULE_AUTHOR("Mattias WALLIN <mattias.wallin@stericsson.com");
	MODULE_DESCRIPTION("AB8500 DEBUG");
	MODULE_LICENSE("GPL v2");