/*
 * Copyright (C) 2011 ST-Ericsson
 * License terms: GNU General Public License (GPL) version 2
 * Debugfs support for the AB5500 MFD driver
 */

#include <linux/module.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/mfd/ab5500/ab5500.h>
#include <linux/mfd/abx500.h>
#include <linux/uaccess.h>

#include "ab5500-core.h"
#include "ab5500-debugfs.h"

static struct ab5500_i2c_ranges ab5500_reg_ranges[AB5500_NUM_BANKS] = {
	[AB5500_BANK_LED] = {
		.bankid = AB5500_BANK_LED,
		.nranges = 1,
		.range = (struct ab5500_reg_range[]) {
			{
				.first = 0x00,
				.last = 0x0C,
				.perm = AB5500_PERM_RW,
			},
		},
	},
	[AB5500_BANK_ADC] = {
		.bankid = AB5500_BANK_ADC,
		.nranges = 6,
		.range = (struct ab5500_reg_range[]) {
			{
				.first = 0x1F,
				.last = 0x22,
				.perm = AB5500_PERM_RO,
			},
			{
				.first = 0x23,
				.last = 0x24,
				.perm = AB5500_PERM_RW,
			},
			{
				.first = 0x26,
				.last = 0x2D,
				.perm = AB5500_PERM_RO,
			},
			{
				.first = 0x2F,
				.last = 0x34,
				.perm = AB5500_PERM_RW,
			},
			{
				.first = 0x37,
				.last = 0x57,
				.perm = AB5500_PERM_RW,
			},
			{
				.first = 0x58,
				.last = 0x58,
				.perm = AB5500_PERM_RO,
			},
		},
	},
	[AB5500_BANK_RTC] = {
		.bankid = AB5500_BANK_RTC,
		.nranges = 2,
		.range = (struct ab5500_reg_range[]) {
			{
				.first = 0x00,
				.last = 0x04,
				.perm = AB5500_PERM_RW,
			},
			{
				.first = 0x06,
				.last = 0x0C,
				.perm = AB5500_PERM_RW,
			},
		},
	},
	[AB5500_BANK_STARTUP] = {
		.bankid = AB5500_BANK_STARTUP,
		.nranges = 12,
		.range = (struct ab5500_reg_range[]) {
			{
				.first = 0x00,
				.last = 0x01,
				.perm = AB5500_PERM_RW,
			},
			{
				.first = 0x1F,
				.last = 0x1F,
				.perm = AB5500_PERM_RW,
			},
			{
				.first = 0x2E,
				.last = 0x2E,
				.perm = AB5500_PERM_RO,
			},
			{
				.first = 0x2F,
				.last = 0x30,
				.perm = AB5500_PERM_RW,
			},
			{
				.first = 0x50,
				.last = 0x51,
				.perm = AB5500_PERM_RW,
			},
			{
				.first = 0x60,
				.last = 0x61,
				.perm = AB5500_PERM_RW,
			},
			{
				.first = 0x66,
				.last = 0x8A,
				.perm = AB5500_PERM_RW,
			},
			{
				.first = 0x8C,
				.last = 0x96,
				.perm = AB5500_PERM_RW,
			},
			{
				.first = 0xAA,
				.last = 0xB4,
				.perm = AB5500_PERM_RW,
			},
			{
				.first = 0xB7,
				.last = 0xBF,
				.perm = AB5500_PERM_RW,
			},
			{
				.first = 0xC1,
				.last = 0xCA,
				.perm = AB5500_PERM_RW,
			},
			{
				.first = 0xD3,
				.last = 0xE0,
				.perm = AB5500_PERM_RW,
			},
		},
	},
	[AB5500_BANK_DBI_ECI] = {
		.bankid = AB5500_BANK_DBI_ECI,
		.nranges = 3,
		.range = (struct ab5500_reg_range[]) {
			{
				.first = 0x00,
				.last = 0x07,
				.perm = AB5500_PERM_RW,
			},
			{
				.first = 0x10,
				.last = 0x10,
				.perm = AB5500_PERM_RW,
			},
			{
				.first = 0x13,
				.last = 0x13,
				.perm = AB5500_PERM_RW,
			},
		},
	},
	[AB5500_BANK_CHG] = {
		.bankid = AB5500_BANK_CHG,
		.nranges = 2,
		.range = (struct ab5500_reg_range[]) {
			{
				.first = 0x11,
				.last = 0x11,
				.perm = AB5500_PERM_RO,
			},
			{
				.first = 0x12,
				.last = 0x1B,
				.perm = AB5500_PERM_RW,
			},
		},
	},
	[AB5500_BANK_FG_BATTCOM_ACC] = {
		.bankid = AB5500_BANK_FG_BATTCOM_ACC,
		.nranges = 2,
		.range = (struct ab5500_reg_range[]) {
			{
				.first = 0x00,
				.last = 0x0B,
				.perm = AB5500_PERM_RO,
			},
			{
				.first = 0x0C,
				.last = 0x10,
				.perm = AB5500_PERM_RW,
			},
		},
	},
	[AB5500_BANK_USB] = {
		.bankid = AB5500_BANK_USB,
		.nranges = 12,
		.range = (struct ab5500_reg_range[]) {
			{
				.first = 0x01,
				.last = 0x01,
				.perm = AB5500_PERM_RW,
			},
			{
				.first = 0x80,
				.last = 0x83,
				.perm = AB5500_PERM_RW,
			},
			{
				.first = 0x87,
				.last = 0x8A,
				.perm = AB5500_PERM_RW,
			},
			{
				.first = 0x8B,
				.last = 0x8B,
				.perm = AB5500_PERM_RO,
			},
			{
				.first = 0x91,
				.last = 0x92,
				.perm = AB5500_PERM_RO,
			},
			{
				.first = 0x93,
				.last = 0x93,
				.perm = AB5500_PERM_RW,
			},
			{
				.first = 0x94,
				.last = 0x94,
				.perm = AB5500_PERM_RO,
			},
			{
				.first = 0xA8,
				.last = 0xB0,
				.perm = AB5500_PERM_RO,
			},
			{
				.first = 0xB2,
				.last = 0xB2,
				.perm = AB5500_PERM_RO,
			},
			{
				.first = 0xB4,
				.last = 0xBC,
				.perm = AB5500_PERM_RO,
			},
			{
				.first = 0xBF,
				.last = 0xBF,
				.perm = AB5500_PERM_RO,
			},
			{
				.first = 0xC1,
				.last = 0xC5,
				.perm = AB5500_PERM_RO,
			},
		},
	},
	[AB5500_BANK_IT] = {
		.bankid = AB5500_BANK_IT,
		.nranges = 4,
		.range = (struct ab5500_reg_range[]) {
			{
				.first = 0x00,
				.last = 0x02,
				.perm = AB5500_PERM_RO,
			},
			{
				.first = 0x20,
				.last = 0x36,
				.perm = AB5500_PERM_RO,
			},
			{
				.first = 0x40,
				.last = 0x56,
				.perm = AB5500_PERM_RO,
			},
			{
				.first = 0x60,
				.last = 0x76,
				.perm = AB5500_PERM_RO,
			},
		},
	},
	[AB5500_BANK_VDDDIG_IO_I2C_CLK_TST] = {
		.bankid = AB5500_BANK_VDDDIG_IO_I2C_CLK_TST,
		.nranges = 7,
		.range = (struct ab5500_reg_range[]) {
			{
				.first = 0x02,
				.last = 0x02,
				.perm = AB5500_PERM_RW,
			},
			{
				.first = 0x12,
				.last = 0x12,
				.perm = AB5500_PERM_RW,
			},
			{
				.first = 0x30,
				.last = 0x34,
				.perm = AB5500_PERM_RW,
			},
			{
				.first = 0x40,
				.last = 0x44,
				.perm = AB5500_PERM_RW,
			},
			{
				.first = 0x50,
				.last = 0x54,
				.perm = AB5500_PERM_RW,
			},
			{
				.first = 0x60,
				.last = 0x64,
				.perm = AB5500_PERM_RW,
			},
			{
				.first = 0x70,
				.last = 0x74,
				.perm = AB5500_PERM_RW,
			},
		},
	},
	[AB5500_BANK_VIT_IO_I2C_CLK_TST_OTP] = {
		.bankid = AB5500_BANK_VIT_IO_I2C_CLK_TST_OTP,
		.nranges = 13,
		.range = (struct ab5500_reg_range[]) {
			{
				.first = 0x01,
				.last = 0x01,
				.perm = AB5500_PERM_RW,
			},
			{
				.first = 0x02,
				.last = 0x02,
				.perm = AB5500_PERM_RO,
			},
			{
				.first = 0x0D,
				.last = 0x0F,
				.perm = AB5500_PERM_RW,
			},
			{
				.first = 0x1C,
				.last = 0x1C,
				.perm = AB5500_PERM_RW,
			},
			{
				.first = 0x1E,
				.last = 0x1E,
				.perm = AB5500_PERM_RW,
			},
			{
				.first = 0x20,
				.last = 0x21,
				.perm = AB5500_PERM_RW,
			},
			{
				.first = 0x25,
				.last = 0x25,
				.perm = AB5500_PERM_RW,
			},
			{
				.first = 0x28,
				.last = 0x2A,
				.perm = AB5500_PERM_RW,
			},
			{
				.first = 0x30,
				.last = 0x33,
				.perm = AB5500_PERM_RW,
			},
			{
				.first = 0x40,
				.last = 0x43,
				.perm = AB5500_PERM_RW,
			},
			{
				.first = 0x50,
				.last = 0x53,
				.perm = AB5500_PERM_RW,
			},
			{
				.first = 0x60,
				.last = 0x63,
				.perm = AB5500_PERM_RW,
			},
			{
				.first = 0x70,
				.last = 0x73,
				.perm = AB5500_PERM_RW,
			},
		},
	},
	[AB5500_BANK_VIBRA] = {
		.bankid = AB5500_BANK_VIBRA,
		.nranges = 2,
		.range = (struct ab5500_reg_range[]) {
			{
				.first = 0x10,
				.last = 0x13,
				.perm = AB5500_PERM_RW,
			},
			{
				.first = 0xFE,
				.last = 0xFE,
				.perm = AB5500_PERM_RW,
			},
		},
	},
	[AB5500_BANK_AUDIO_HEADSETUSB] = {
		.bankid = AB5500_BANK_AUDIO_HEADSETUSB,
		.nranges = 2,
		.range = (struct ab5500_reg_range[]) {
			{
				.first = 0x00,
				.last = 0x48,
				.perm = AB5500_PERM_RW,
			},
			{
				.first = 0xEB,
				.last = 0xFB,
				.perm = AB5500_PERM_RW,
			},
		},
	},
	[AB5500_BANK_SIM_USBSIM] = {
		.bankid = AB5500_BANK_SIM_USBSIM,
		.nranges = 1,
		.range = (struct ab5500_reg_range[]) {
			{
				.first = 0x13,
				.last = 0x19,
				.perm = AB5500_PERM_RW,
			},
		},
	},
	[AB5500_BANK_VDENC] = {
		.bankid = AB5500_BANK_VDENC,
		.nranges = 12,
		.range = (struct ab5500_reg_range[]) {
			{
				.first = 0x00,
				.last = 0x08,
				.perm = AB5500_PERM_RW,
			},
			{
				.first = 0x09,
				.last = 0x09,
				.perm = AB5500_PERM_RO,
			},
			{
				.first = 0x0A,
				.last = 0x12,
				.perm = AB5500_PERM_RW,
			},
			{
				.first = 0x15,
				.last = 0x19,
				.perm = AB5500_PERM_RW,
			},
			{
				.first = 0x1B,
				.last = 0x21,
				.perm = AB5500_PERM_RW,
			},
			{
				.first = 0x27,
				.last = 0x2C,
				.perm = AB5500_PERM_RW,
			},
			{
				.first = 0x41,
				.last = 0x41,
				.perm = AB5500_PERM_RW,
			},
			{
				.first = 0x45,
				.last = 0x5B,
				.perm = AB5500_PERM_RW,
			},
			{
				.first = 0x5D,
				.last = 0x5D,
				.perm = AB5500_PERM_RW,
			},
			{
				.first = 0x69,
				.last = 0x69,
				.perm = AB5500_PERM_RW,
			},
			{
				.first = 0x6C,
				.last = 0x6D,
				.perm = AB5500_PERM_RW,
			},
			{
				.first = 0x80,
				.last = 0x81,
				.perm = AB5500_PERM_RW,
			},
		},
	},
};

static int ab5500_registers_print(struct seq_file *s, void *p)
{
	struct ab5500 *ab = s->private;
	unsigned int i;
	u8 bank = (u8)ab->debug_bank;

	seq_printf(s, "ab5500 register values:\n");
	for (bank = 0; bank < AB5500_NUM_BANKS; bank++) {
		seq_printf(s, " bank %u, %s (0x%x):\n", bank,
				bankinfo[bank].name,
				bankinfo[bank].slave_addr);
		for (i = 0; i < ab5500_reg_ranges[bank].nranges; i++) {
			u8 reg;
			int err;

			for (reg = ab5500_reg_ranges[bank].range[i].first;
				reg <= ab5500_reg_ranges[bank].range[i].last;
				reg++) {
				u8 value;

				err = ab5500_get_register_interruptible_raw(ab,
								bank, reg,
								&value);
				if (err < 0) {
					dev_err(ab->dev, "get_reg failed %d"
						"bank 0x%x reg 0x%x\n",
						err, bank, reg);
					return err;
				}

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

static int ab5500_registers_open(struct inode *inode, struct file *file)
{
	return single_open(file, ab5500_registers_print, inode->i_private);
}

static const struct file_operations ab5500_registers_fops = {
	.open = ab5500_registers_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
	.owner = THIS_MODULE,
};

static int ab5500_bank_print(struct seq_file *s, void *p)
{
	struct ab5500 *ab = s->private;

	seq_printf(s, "%d\n", ab->debug_bank);
	return 0;
}

static int ab5500_bank_open(struct inode *inode, struct file *file)
{
	return single_open(file, ab5500_bank_print, inode->i_private);
}

static ssize_t ab5500_bank_write(struct file *file,
	const char __user *user_buf,
	size_t count, loff_t *ppos)
{
	struct ab5500 *ab = ((struct seq_file *)(file->private_data))->private;
	char buf[32];
	int buf_size;
	unsigned long user_bank;
	int err;

	/* Get userspace string and assure termination */
	buf_size = min(count, (sizeof(buf) - 1));
	if (copy_from_user(buf, user_buf, buf_size))
		return -EFAULT;
	buf[buf_size] = 0;

	err = strict_strtoul(buf, 0, &user_bank);
	if (err)
		return -EINVAL;

	if (user_bank >= AB5500_NUM_BANKS) {
		dev_err(ab->dev,
			"debugfs error input > number of banks\n");
		return -EINVAL;
	}

	ab->debug_bank = user_bank;

	return buf_size;
}

static int ab5500_address_print(struct seq_file *s, void *p)
{
	struct ab5500 *ab = s->private;

	seq_printf(s, "0x%02X\n", ab->debug_address);
	return 0;
}

static int ab5500_address_open(struct inode *inode, struct file *file)
{
	return single_open(file, ab5500_address_print, inode->i_private);
}

static ssize_t ab5500_address_write(struct file *file,
	const char __user *user_buf,
	size_t count, loff_t *ppos)
{
	struct ab5500 *ab = ((struct seq_file *)(file->private_data))->private;
	char buf[32];
	int buf_size;
	unsigned long user_address;
	int err;

	/* Get userspace string and assure termination */
	buf_size = min(count, (sizeof(buf) - 1));
	if (copy_from_user(buf, user_buf, buf_size))
		return -EFAULT;
	buf[buf_size] = 0;

	err = strict_strtoul(buf, 0, &user_address);
	if (err)
		return -EINVAL;
	if (user_address > 0xff) {
		dev_err(ab->dev,
			"debugfs error input > 0xff\n");
		return -EINVAL;
	}
	ab->debug_address = user_address;
	return buf_size;
}

static int ab5500_val_print(struct seq_file *s, void *p)
{
	struct ab5500 *ab = s->private;
	int err;
	u8 regvalue;

	err = ab5500_get_register_interruptible_raw(ab, (u8)ab->debug_bank,
		(u8)ab->debug_address, &regvalue);
	if (err) {
		dev_err(ab->dev, "get_reg failed %d, bank 0x%x"
			", reg 0x%x\n", err, ab->debug_bank,
			ab->debug_address);
		return -EINVAL;
	}
	seq_printf(s, "0x%02X\n", regvalue);

	return 0;
}

static int ab5500_val_open(struct inode *inode, struct file *file)
{
	return single_open(file, ab5500_val_print, inode->i_private);
}

static ssize_t ab5500_val_write(struct file *file,
	const char __user *user_buf,
	size_t count, loff_t *ppos)
{
	struct ab5500 *ab = ((struct seq_file *)(file->private_data))->private;
	char buf[32];
	int buf_size;
	unsigned long user_val;
	int err;
	u8 regvalue;

	/* Get userspace string and assure termination */
	buf_size = min(count, (sizeof(buf)-1));
	if (copy_from_user(buf, user_buf, buf_size))
		return -EFAULT;
	buf[buf_size] = 0;

	err = strict_strtoul(buf, 0, &user_val);
	if (err)
		return -EINVAL;
	if (user_val > 0xff) {
		dev_err(ab->dev,
			"debugfs error input > 0xff\n");
		return -EINVAL;
	}
	err = ab5500_mask_and_set_register_interruptible_raw(
		ab, (u8)ab->debug_bank,
		(u8)ab->debug_address, 0xFF, (u8)user_val);
	if (err)
		return -EINVAL;

	ab5500_get_register_interruptible_raw(ab, (u8)ab->debug_bank,
		(u8)ab->debug_address, &regvalue);
	if (err)
		return -EINVAL;

	return buf_size;
}

static const struct file_operations ab5500_bank_fops = {
	.open = ab5500_bank_open,
	.write = ab5500_bank_write,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
	.owner = THIS_MODULE,
};

static const struct file_operations ab5500_address_fops = {
	.open = ab5500_address_open,
	.write = ab5500_address_write,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
	.owner = THIS_MODULE,
};

static const struct file_operations ab5500_val_fops = {
	.open = ab5500_val_open,
	.write = ab5500_val_write,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
	.owner = THIS_MODULE,
};

static struct dentry *ab5500_dir;
static struct dentry *ab5500_reg_file;
static struct dentry *ab5500_bank_file;
static struct dentry *ab5500_address_file;
static struct dentry *ab5500_val_file;

void __init ab5500_setup_debugfs(struct ab5500 *ab)
{
	ab->debug_bank = AB5500_BANK_VIT_IO_I2C_CLK_TST_OTP;
	ab->debug_address = AB5500_CHIP_ID;

	ab5500_dir = debugfs_create_dir("ab5500", NULL);
	if (!ab5500_dir)
		goto exit_no_debugfs;

	ab5500_reg_file = debugfs_create_file("all-bank-registers",
		S_IRUGO, ab5500_dir, ab, &ab5500_registers_fops);
	if (!ab5500_reg_file)
		goto exit_destroy_dir;

	ab5500_bank_file = debugfs_create_file("register-bank",
		(S_IRUGO | S_IWUGO), ab5500_dir, ab, &ab5500_bank_fops);
	if (!ab5500_bank_file)
		goto exit_destroy_reg;

	ab5500_address_file = debugfs_create_file("register-address",
		(S_IRUGO | S_IWUGO), ab5500_dir, ab, &ab5500_address_fops);
	if (!ab5500_address_file)
		goto exit_destroy_bank;

	ab5500_val_file = debugfs_create_file("register-value",
		(S_IRUGO | S_IWUGO), ab5500_dir, ab, &ab5500_val_fops);
	if (!ab5500_val_file)
		goto exit_destroy_address;

	return;

exit_destroy_address:
	debugfs_remove(ab5500_address_file);
exit_destroy_bank:
	debugfs_remove(ab5500_bank_file);
exit_destroy_reg:
	debugfs_remove(ab5500_reg_file);
exit_destroy_dir:
	debugfs_remove(ab5500_dir);
exit_no_debugfs:
	dev_err(ab->dev, "failed to create debugfs entries.\n");
	return;
}

void __exit ab5500_remove_debugfs(void)
{
	debugfs_remove(ab5500_val_file);
	debugfs_remove(ab5500_address_file);
	debugfs_remove(ab5500_bank_file);
	debugfs_remove(ab5500_reg_file);
	debugfs_remove(ab5500_dir);
}