Squashandroid-20111012

Change-Id: If0ae9fa8067740ab2ede33703c79ec134f204a5e

1 files changed, 1175 insertions, 0 deletions

diff --git a/drivers/mfd/ab8500-debugfs.c b/drivers/mfd/ab8500-debugfs.c
new file mode 100644
index 00000000000..745f4955c8f
--- /dev/null
+++ b/drivers/mfd/ab8500-debugfs.c
@@ -0,0 +1,1175 @@
+/*
+ * Copyright (C) ST-Ericsson SA 2010
+ *
+ * Author: Mattias Wallin <mattias.wallin@stericsson.com> for ST-Ericsson.
+ * License Terms: GNU General Public License v2
+ */
+/*
+ * AB8500 register access
+ * ======================
+ *
+ * read:
+ * # echo BANK  >  <debugfs>/ab8500/register-bank
+ * # echo ADDR  >  <debugfs>/ab8500/register-address
+ * # cat <debugfs>/ab8500/register-value
+ *
+ * write:
+ * # echo BANK  >  <debugfs>/ab8500/register-bank
+ * # echo ADDR  >  <debugfs>/ab8500/register-address
+ * # echo VALUE >  <debugfs>/ab8500/register-value
+ *
+ * read all registers from a bank:
+ * # echo BANK  >  <debugfs>/ab8500/register-bank
+ * # cat <debugfs>/ab8500/all-bank-register
+ *
+ * BANK   target AB8500 register bank
+ * ADDR   target AB8500 register address
+ * VALUE  decimal or 0x-prefixed hexadecimal
+ *
+ *
+ * User Space notification on AB8500 IRQ
+ * =====================================
+ *
+ * Allows user space entity to be notified when target AB8500 IRQ occurs.
+ * When subscribed, a sysfs entry is created in ab8500.i2c platform device.
+ * One can pool this file to get target IRQ occurence information.
+ *
+ * subscribe to an AB8500 IRQ:
+ * # echo IRQ  >  <debugfs>/ab8500/irq-subscribe
+ *
+ * unsubscribe from an AB8500 IRQ:
+ * # echo IRQ  >  <debugfs>/ab8500/irq-unsubscribe
+ *
+ *
+ * AB8500 register formated read/write access
+ * ==========================================
+ *
+ * Read:  read data, data>>SHIFT, data&=MASK, output data
+ *        [0xABCDEF98] shift=12 mask=0xFFF => 0x00000CDE
+ * Write: read data, data &= ~(MASK<<SHIFT), data |= (VALUE<<SHIFT), write data
+ *        [0xABCDEF98] shift=12 mask=0xFFF value=0x123 => [0xAB123F98]
+ *
+ * Usage:
+ * # echo "CMD [OPTIONS] BANK ADRESS [VALUE]" > $debugfs/ab8500/hwreg
+ *
+ * CMD      read      read access
+ *          write     write access
+ *
+ * BANK     target reg bank
+ * ADDRESS  target reg address
+ * VALUE    (write) value to be updated
+ *
+ * OPTIONS
+ *  -d|-dec            (read) output in decimal
+ *  -h|-hexa           (read) output in 0x-hexa (default)
+ *  -l|-w|-b           32bit (default), 16bit or 8bit reg access
+ *  -m|-mask MASK      0x-hexa mask (default 0xFFFFFFFF)
+ *  -s|-shift SHIFT    bit shift value (read:left, write:right)
+ *  -o|-offset OFFSET  address offset to add to ADDRESS value
+ *
+ * Warning: bit shift operation is applied to bit-mask.
+ * Warning: bit shift direction depends on read or right command.
+ */
+
+#include <linux/seq_file.h>
+#include <linux/uaccess.h>
+#include <linux/fs.h>
+#include <linux/debugfs.h>
+#include <linux/platform_device.h>
+#include <linux/interrupt.h>
+#include <linux/kobject.h>
+#include <linux/slab.h>
+
+#include <linux/mfd/abx500.h>
+#include <linux/mfd/ab8500.h>
+
+#ifdef CONFIG_DEBUG_FS
+#include <linux/string.h>
+#include <linux/ctype.h>
+#endif
+
+static u32 debug_bank;
+static u32 debug_address;
+
+static int irq_first;
+static int irq_last;
+static u32 irq_count[AB8500_NR_IRQS];
+
+static struct device_attribute *dev_attr[AB8500_NR_IRQS];
+static char *event_name[AB8500_NR_IRQS];
+
+/**
+ * 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;
+};
+
+/* hwreg- "mask" and "shift" entries ressources */
+struct hwreg_cfg {
+	u32  bank;      /* target bank */
+	u32  addr;      /* target address */
+	uint fmt;       /* format */
+	uint mask;      /* read/write mask, applied before any bit shift */
+	int  shift;     /* bit shift (read:right shift, write:left shift */
+};
+/* fmt bit #0: 0=hexa, 1=dec */
+#define REG_FMT_DEC(c) ((c)->fmt & 0x1)
+#define REG_FMT_HEX(c) (!REG_FMT_DEC(c))
+
+static struct hwreg_cfg hwreg_cfg = {
+	.addr = 0,			/* default: invalid phys addr */
+	.fmt = 0,			/* default: 32bit access, hex output */
+	.mask = 0xFFFFFFFF,	/* default: no mask */
+	.shift = 0,			/* default: no bit shift */
+};
+
+#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 = NULL,
+	},
+	[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 = 9,
+		.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,
+			},
+			{
+				.first = 0xf5,
+				.last = 0xf6,
+			},
+		},
+	},
+	[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,
+			},
+		},
+	},
+	[AB8500_DEVELOPMENT] = {
+		.num_ranges = 1,
+		.range = (struct ab8500_reg_range[]) {
+			{
+				.first = 0x00,
+				.last = 0x00,
+			},
+		},
+	},
+	[AB8500_DEBUG] = {
+		.num_ranges = 1,
+		.range = (struct ab8500_reg_range[]) {
+			{
+				.first = 0x05,
+				.last = 0x07,
+			},
+		},
+	},
+	[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 irqreturn_t ab8500_debug_handler(int irq, void *data)
+{
+	char buf[16];
+	struct kobject *kobj = (struct kobject *)data;
+	unsigned int irq_abb = irq - irq_first;
+
+	if (irq_abb < AB8500_NR_IRQS)
+		irq_count[irq_abb]++;
+	/*
+	 * This makes it possible to use poll for events (POLLPRI | POLLERR)
+	 * from userspace on sysfs file named <irq-nr>
+	 */
+	sprintf(buf, "%d", irq);
+	sysfs_notify(kobj, NULL, buf);
+
+	return IRQ_HANDLED;
+}
+
+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;
+	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 >= AB8500_NUM_BANKS) {
+		dev_err(dev, "debugfs error input > number of banks\n");
+		return -EINVAL;
+	}
+
+	debug_bank = user_bank;
+
+	return buf_size;
+}
+
+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;
+	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(dev, "debugfs error input > 0xff\n");
+		return -EINVAL;
+	}
+	debug_address = user_address;
+	return buf_size;
+}
+
+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;
+	char buf[32];
+	int buf_size;
+	unsigned long user_val;
+	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_val);
+	if (err)
+		return -EINVAL;
+	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 buf_size;
+}
+
+/*
+ * - HWREG DB8500 formated routines
+ */
+static int ab8500_hwreg_print(struct seq_file *s, void *d)
+{
+	struct device *dev = s->private;
+	int ret;
+	u8 regvalue;
+
+	ret = abx500_get_register_interruptible(dev,
+		(u8)hwreg_cfg.bank, (u8)hwreg_cfg.addr, &regvalue);
+	if (ret < 0) {
+		dev_err(dev, "abx500_get_reg fail %d, %d\n",
+			ret, __LINE__);
+		return -EINVAL;
+	}
+
+	if (hwreg_cfg.shift >= 0)
+		regvalue >>= hwreg_cfg.shift;
+	else
+		regvalue <<= -hwreg_cfg.shift;
+	regvalue &= hwreg_cfg.mask;
+
+	if (REG_FMT_DEC(&hwreg_cfg))
+		seq_printf(s, "%d\n", regvalue);
+	else
+		seq_printf(s, "0x%02X\n", regvalue);
+	return 0;
+}
+
+static int ab8500_hwreg_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, ab8500_hwreg_print, inode->i_private);
+}
+
+/*
+ * return length of an ASCII numerical value, 0 is string is not a
+ * numerical value.
+ * string shall start at value 1st char.
+ * string can be tailed with \0 or space or newline chars only.
+ * value can be decimal or hexadecimal (prefixed 0x or 0X).
+ */
+static int strval_len(char *b)
+{
+	char *s = b;
+	if ((*s == '0') && ((*(s+1) == 'x') || (*(s+1) == 'X'))) {
+		s += 2;
+		for (; *s && (*s != ' ') && (*s != '\n'); s++) {
+			if (!isxdigit(*s))
+				return 0;
+		}
+	} else {
+		if (*s == '-')
+			s++;
+		for (; *s && (*s != ' ') && (*s != '\n'); s++) {
+			if (!isdigit(*s))
+				return 0;
+		}
+	}
+	return (int) (s-b);
+}
+
+/*
+ * parse hwreg input data.
+ * update global hwreg_cfg only if input data syntax is ok.
+ */
+static ssize_t hwreg_common_write(char *b, struct hwreg_cfg *cfg,
+		struct device *dev)
+{
+	uint write, val = 0;
+	struct hwreg_cfg loc = {
+		.bank = 0,          /* default: invalid phys addr */
+		.addr = 0,          /* default: invalid phys addr */
+		.fmt = 0,           /* default: 32bit access, hex output */
+		.mask = 0xFFFFFFFF, /* default: no mask */
+		.shift = 0,         /* default: no bit shift */
+	};
+
+	/* read or write ? */
+	if (!strncmp(b, "read ", 5)) {
+		write = 0;
+		b += 5;
+	} else if (!strncmp(b, "write ", 6)) {
+		write = 1;
+		b += 6;
+	} else
+		return -EINVAL;
+
+	/* OPTIONS -l|-w|-b -s -m -o */
+	while ((*b == ' ') || (*b == '-')) {
+		if (*(b-1) != ' ') {
+			b++;
+			continue;
+		}
+		if ((!strncmp(b, "-d ", 3)) ||
+				(!strncmp(b, "-dec ", 5))) {
+			b += (*(b+2) == ' ') ? 3 : 5;
+			loc.fmt |= (1<<0);
+		} else if ((!strncmp(b, "-h ", 3)) ||
+				(!strncmp(b, "-hex ", 5))) {
+			b += (*(b+2) == ' ') ? 3 : 5;
+			loc.fmt &= ~(1<<0);
+		} else if ((!strncmp(b, "-m ", 3)) ||
+				(!strncmp(b, "-mask ", 6))) {
+			b += (*(b+2) == ' ') ? 3 : 6;
+			if (strval_len(b) == 0)
+				return -EINVAL;
+			loc.mask = simple_strtoul(b, &b, 0);
+		} else if ((!strncmp(b, "-s ", 3)) ||
+				(!strncmp(b, "-shift ", 7))) {
+			b += (*(b+2) == ' ') ? 3 : 7;
+			if (strval_len(b) == 0)
+				return -EINVAL;
+			loc.shift = simple_strtol(b, &b, 0);
+		} else {
+			return -EINVAL;
+		}
+	}
+	/* get arg BANK and ADDRESS */
+	if (strval_len(b) == 0)
+		return -EINVAL;
+	loc.bank = simple_strtoul(b, &b, 0);
+	while (*b == ' ')
+		b++;
+	if (strval_len(b) == 0)
+		return -EINVAL;
+	loc.addr = simple_strtoul(b, &b, 0);
+
+	if (write) {
+		while (*b == ' ')
+			b++;
+		if (strval_len(b) == 0)
+			return -EINVAL;
+		val = simple_strtoul(b, &b, 0);
+	}
+
+	/* args are ok, update target cfg (mainly for read) */
+	*cfg = loc;
+
+#ifdef ABB_HWREG_DEBUG
+	pr_warn("HWREG request: %s, %s, addr=0x%08X, mask=0x%X, shift=%d"
+		"value=0x%X\n", (write) ? "write" : "read",
+		REG_FMT_DEC(cfg) ? "decimal" : "hexa",
+		cfg->addr, cfg->mask, cfg->shift, val);
+#endif
+
+	if (write) {
+		u8  regvalue;
+		int ret = abx500_get_register_interruptible(dev,
+			(u8)cfg->bank, (u8)cfg->addr, &regvalue);
+		if (ret < 0) {
+			dev_err(dev, "abx500_get_reg fail %d, %d\n",
+				ret, __LINE__);
+			return -EINVAL;
+		}
+
+		if (cfg->shift >= 0) {
+			regvalue &= ~(cfg->mask << (cfg->shift));
+			val = (val & cfg->mask) << (cfg->shift);
+		} else {
+			regvalue &= ~(cfg->mask >> (-cfg->shift));
+			val = (val & cfg->mask) >> (-cfg->shift);
+		}
+		val = val | regvalue;
+
+		ret = abx500_set_register_interruptible(dev,
+			(u8)cfg->bank, (u8)cfg->addr, (u8)val);
+		if (ret < 0) {
+			pr_err("abx500_set_reg failed %d, %d", ret, __LINE__);
+			return -EINVAL;
+		}
+
+	}
+	return 0;
+}
+
+static ssize_t ab8500_hwreg_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;
+	char buf[128];
+	int buf_size, ret;
+
+	/* 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;
+
+	/* get args and process */
+	ret = hwreg_common_write(buf, &hwreg_cfg, dev);
+	return (ret) ? ret : buf_size;
+}
+
+/*
+ * - irq subscribe/unsubscribe stuff
+ */
+static int ab8500_subscribe_unsubscribe_print(struct seq_file *s, void *p)
+{
+	seq_printf(s, "%d\n", irq_first);
+
+	return 0;
+}
+
+static int ab8500_subscribe_unsubscribe_open(struct inode *inode,
+	struct file *file)
+{
+	return single_open(file, ab8500_subscribe_unsubscribe_print,
+		inode->i_private);
+}
+
+/*
+ * Userspace should use poll() on this file. When an event occur
+ * the blocking poll will be released.
+ */
+static ssize_t show_irq(struct device *dev,
+	struct device_attribute *attr, char *buf)
+{
+	unsigned long name;
+	unsigned int irq_index;
+	int err;
+
+	err = strict_strtoul(attr->attr.name, 0, &name);
+	if (err)
+		return err;
+
+	irq_index = name - irq_first;
+	if (irq_index >= AB8500_NR_IRQS)
+		return -EINVAL;
+	else
+		return sprintf(buf, "%u\n", irq_count[irq_index]);
+}
+
+static ssize_t ab8500_subscribe_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;
+	char buf[32];
+	int buf_size;
+	unsigned long user_val;
+	int err;
+	unsigned int irq_index;
+
+	/* 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 < irq_first) {
+		dev_err(dev, "debugfs error input < %d\n", irq_first);
+		return -EINVAL;
+	}
+	if (user_val > irq_last) {
+		dev_err(dev, "debugfs error input > %d\n", irq_last);
+		return -EINVAL;
+	}
+
+	irq_index = user_val - irq_first;
+	if (irq_index >= AB8500_NR_IRQS)
+		return -EINVAL;
+
+	/*
+	 * This will create a sysfs file named <irq-nr> which userspace can
+	 * use to select or poll and get the AB8500 events
+	 */
+	dev_attr[irq_index] = kmalloc(sizeof(struct device_attribute),
+		GFP_KERNEL);
+	event_name[irq_index] = kmalloc(buf_size, GFP_KERNEL);
+	sprintf(event_name[irq_index], "%lu", user_val);
+	dev_attr[irq_index]->show = show_irq;
+	dev_attr[irq_index]->store = NULL;
+	dev_attr[irq_index]->attr.name = event_name[irq_index];
+	dev_attr[irq_index]->attr.mode = S_IRUGO;
+	err = sysfs_create_file(&dev->kobj, &dev_attr[irq_index]->attr);
+	if (err < 0) {
+		printk(KERN_ERR "sysfs_create_file failed %d\n", err);
+		return err;
+	}
+
+	err = request_threaded_irq(user_val, NULL, ab8500_debug_handler,
+		IRQF_SHARED | IRQF_NO_SUSPEND, "ab8500-debug", &dev->kobj);
+	if (err < 0) {
+		printk(KERN_ERR "request_threaded_irq failed %d, %lu\n",
+			err, user_val);
+		sysfs_remove_file(&dev->kobj, &dev_attr[irq_index]->attr);
+		return err;
+	}
+
+	return buf_size;
+}
+
+static ssize_t ab8500_unsubscribe_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;
+	char buf[32];
+	int buf_size;
+	unsigned long user_val;
+	int err;
+	unsigned int irq_index;
+
+	/* 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 < irq_first) {
+		dev_err(dev, "debugfs error input < %d\n", irq_first);
+		return -EINVAL;
+	}
+	if (user_val > irq_last) {
+		dev_err(dev, "debugfs error input > %d\n", irq_last);
+		return -EINVAL;
+	}
+
+	irq_index = user_val - irq_first;
+	if (irq_index >= AB8500_NR_IRQS)
+		return -EINVAL;
+
+	/* Set irq count to 0 when unsubscribe */
+	irq_count[irq_index] = 0;
+
+	if (dev_attr[irq_index])
+		sysfs_remove_file(&dev->kobj, &dev_attr[irq_index]->attr);
+
+
+	free_irq(user_val, &dev->kobj);
+	kfree(event_name[irq_index]);
+	kfree(dev_attr[irq_index]);
+
+	return buf_size;
+}
+
+/*
+ * - several deubgfs nodes fops
+ */
+
+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 const struct file_operations ab8500_subscribe_fops = {
+	.open = ab8500_subscribe_unsubscribe_open,
+	.write = ab8500_subscribe_write,
+	.read = seq_read,
+	.llseek = seq_lseek,
+	.release = single_release,
+	.owner = THIS_MODULE,
+};
+
+static const struct file_operations ab8500_unsubscribe_fops = {
+	.open = ab8500_subscribe_unsubscribe_open,
+	.write = ab8500_unsubscribe_write,
+	.read = seq_read,
+	.llseek = seq_lseek,
+	.release = single_release,
+	.owner = THIS_MODULE,
+};
+
+static const struct file_operations ab8500_hwreg_fops = {
+	.open = ab8500_hwreg_open,
+	.write = ab8500_hwreg_write,
+	.read = seq_read,
+	.llseek = seq_lseek,
+	.release = single_release,
+	.owner = THIS_MODULE,
+};
+
+static struct dentry *ab8500_dir;
+
+static int __devinit ab8500_debug_probe(struct platform_device *plf)
+{
+	struct dentry *file;
+	debug_bank = AB8500_MISC;
+	debug_address = AB8500_REV_REG & 0x00FF;
+
+	irq_first = platform_get_irq_byname(plf, "IRQ_FIRST");
+	if (irq_first < 0) {
+		dev_err(&plf->dev, "First irq not found, err %d\n",
+			irq_first);
+		return irq_first;
+	}
+
+	irq_last = platform_get_irq_byname(plf, "IRQ_LAST");
+	if (irq_last < 0) {
+		dev_err(&plf->dev, "Last irq not found, err %d\n",
+			irq_last);
+		return irq_last;
+	}
+
+	ab8500_dir = debugfs_create_dir(AB8500_NAME_STRING, NULL);
+	if (!ab8500_dir)
+		goto err;
+
+	file = debugfs_create_file("all-bank-registers",
+		S_IRUGO, ab8500_dir, &plf->dev, &ab8500_registers_fops);
+	if (!file)
+		goto err;
+
+	file = debugfs_create_file("register-bank",
+		(S_IRUGO | S_IWUGO), ab8500_dir, &plf->dev, &ab8500_bank_fops);
+	if (!file)
+		goto err;
+
+	file = debugfs_create_file("register-address",
+		(S_IRUGO | S_IWUGO), ab8500_dir, &plf->dev,
+		&ab8500_address_fops);
+	if (!file)
+		goto err;
+
+	file = debugfs_create_file("register-value",
+		(S_IRUGO | S_IWUGO), ab8500_dir, &plf->dev, &ab8500_val_fops);
+	if (!file)
+		goto err;
+
+	file = debugfs_create_file("irq-subscribe",
+		(S_IRUGO | S_IWUGO), ab8500_dir, &plf->dev,
+		&ab8500_subscribe_fops);
+	if (!file)
+		goto err;
+
+	file = debugfs_create_file("irq-unsubscribe",
+		(S_IRUGO | S_IWUGO), ab8500_dir, &plf->dev,
+		&ab8500_unsubscribe_fops);
+	if (!file)
+		goto err;
+
+	file = debugfs_create_file("hwreg",
+		(S_IRUGO | S_IWUGO), ab8500_dir, &plf->dev,
+		&ab8500_hwreg_fops);
+	if (!file)
+		goto err;
+
+	return 0;
+
+err:
+	if (ab8500_dir)
+		debugfs_remove_recursive(ab8500_dir);
+	dev_err(&plf->dev, "failed to create debugfs entries.\n");
+	return -ENOMEM;
+}
+
+static int __devexit ab8500_debug_remove(struct platform_device *plf)
+{
+	debugfs_remove_recursive(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");