drivers/mfd/ab3100-core.c - arm/linux-arm64-legacy - Git at Google

 /*
  * Copyright (C) 2007-2010 ST-Ericsson
  * License terms: GNU General Public License (GPL) version 2
  * Low-level core for exclusive access to the AB3100 IC on the I2C bus
  * and some basic chip-configuration.
  * Author: Linus Walleij <linus.walleij@stericsson.com>
  */

 #include <linux/i2c.h>
 #include <linux/mutex.h>
 #include <linux/list.h>
 #include <linux/notifier.h>
 #include <linux/slab.h>
 #include <linux/err.h>
 #include <linux/module.h>
 #include <linux/platform_device.h>
 #include <linux/device.h>
 #include <linux/interrupt.h>
 #include <linux/random.h>
 #include <linux/debugfs.h>
 #include <linux/seq_file.h>
 #include <linux/uaccess.h>
 #include <linux/mfd/core.h>
 #include <linux/mfd/ab3100.h>
 #include <linux/mfd/abx500.h>

 /* These are the only registers inside AB3100 used in this main file */

 /* Interrupt event registers */
 #define AB3100_EVENTA1		0x21
 #define AB3100_EVENTA2		0x22
 #define AB3100_EVENTA3		0x23

 /* AB3100 DAC converter registers */
 #define AB3100_DIS		0x00
 #define AB3100_D0C		0x01
 #define AB3100_D1C		0x02
 #define AB3100_D2C		0x03
 #define AB3100_D3C		0x04

 /* Chip ID register */
 #define AB3100_CID		0x20

 /* AB3100 interrupt registers */
 #define AB3100_IMRA1		0x24
 #define AB3100_IMRA2		0x25
 #define AB3100_IMRA3		0x26
 #define AB3100_IMRB1		0x2B
 #define AB3100_IMRB2		0x2C
 #define AB3100_IMRB3		0x2D

 /* System Power Monitoring and control registers */
 #define AB3100_MCA		0x2E
 #define AB3100_MCB		0x2F

 /* SIM power up */
 #define AB3100_SUP		0x50

 /*
  * I2C communication
  *
  * The AB3100 is usually assigned address 0x48 (7-bit)
  * The chip is defined in the platform i2c_board_data section.
  */
 static int ab3100_get_chip_id(struct device *dev)
 {
 	struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);

 	return (int)ab3100->chip_id;
 }

 static int ab3100_set_register_interruptible(struct ab3100 *ab3100,
 	u8 reg, u8 regval)
 {
 	u8 regandval[2] = {reg, regval};
 	int err;

 	err = mutex_lock_interruptible(&ab3100->access_mutex);
 	if (err)
 		return err;

 	/*
 	 * A two-byte write message with the first byte containing the register
 	 * number and the second byte containing the value to be written
 	 * effectively sets a register in the AB3100.
 	 */
 	err = i2c_master_send(ab3100->i2c_client, regandval, 2);
 	if (err < 0) {
 		dev_err(ab3100->dev,
 			"write error (write register): %d\n",
 			err);
 	} else if (err != 2) {
 		dev_err(ab3100->dev,
 			"write error (write register) "
 			"%d bytes transferred (expected 2)\n",
 			err);
 		err = -EIO;
 	} else {
 		/* All is well */
 		err = 0;
 	}
 	mutex_unlock(&ab3100->access_mutex);
 	return err;
 }

 static int set_register_interruptible(struct device *dev,
 	u8 bank, u8 reg, u8 value)
 {
 	struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);

 	return ab3100_set_register_interruptible(ab3100, reg, value);
 }

 /*
  * The test registers exist at an I2C bus address up one
  * from the ordinary base. They are not supposed to be used
  * in production code, but sometimes you have to do that
  * anyway. It's currently only used from this file so declare
  * it static and do not export.
  */
 static int ab3100_set_test_register_interruptible(struct ab3100 *ab3100,
 				    u8 reg, u8 regval)
 {
 	u8 regandval[2] = {reg, regval};
 	int err;

 	err = mutex_lock_interruptible(&ab3100->access_mutex);
 	if (err)
 		return err;

 	err = i2c_master_send(ab3100->testreg_client, regandval, 2);
 	if (err < 0) {
 		dev_err(ab3100->dev,
 			"write error (write test register): %d\n",
 			err);
 	} else if (err != 2) {
 		dev_err(ab3100->dev,
 			"write error (write test register) "
 			"%d bytes transferred (expected 2)\n",
 			err);
 		err = -EIO;
 	} else {
 		/* All is well */
 		err = 0;
 	}
 	mutex_unlock(&ab3100->access_mutex);

 	return err;
 }

 static int ab3100_get_register_interruptible(struct ab3100 *ab3100,
 					     u8 reg, u8 *regval)
 {
 	int err;

 	err = mutex_lock_interruptible(&ab3100->access_mutex);
 	if (err)
 		return err;

 	/*
 	 * AB3100 require an I2C "stop" command between each message, else
 	 * it will not work. The only way of achieveing this with the
 	 * message transport layer is to send the read and write messages
 	 * separately.
 	 */
 	err = i2c_master_send(ab3100->i2c_client, &reg, 1);
 	if (err < 0) {
 		dev_err(ab3100->dev,
 			"write error (send register address): %d\n",
 			err);
 		goto get_reg_out_unlock;
 	} else if (err != 1) {
 		dev_err(ab3100->dev,
 			"write error (send register address) "
 			"%d bytes transferred (expected 1)\n",
 			err);
 		err = -EIO;
 		goto get_reg_out_unlock;
 	} else {
 		/* All is well */
 		err = 0;
 	}

 	err = i2c_master_recv(ab3100->i2c_client, regval, 1);
 	if (err < 0) {
 		dev_err(ab3100->dev,
 			"write error (read register): %d\n",
 			err);
 		goto get_reg_out_unlock;
 	} else if (err != 1) {
 		dev_err(ab3100->dev,
 			"write error (read register) "
 			"%d bytes transferred (expected 1)\n",
 			err);
 		err = -EIO;
 		goto get_reg_out_unlock;
 	} else {
 		/* All is well */
 		err = 0;
 	}

  get_reg_out_unlock:
 	mutex_unlock(&ab3100->access_mutex);
 	return err;
 }

 static int get_register_interruptible(struct device *dev, u8 bank, u8 reg,
 				      u8 *value)
 {
 	struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);

 	return ab3100_get_register_interruptible(ab3100, reg, value);
 }

 static int ab3100_get_register_page_interruptible(struct ab3100 *ab3100,
 			     u8 first_reg, u8 *regvals, u8 numregs)
 {
 	int err;

 	if (ab3100->chip_id == 0xa0 ||
 	    ab3100->chip_id == 0xa1)
 		/* These don't support paged reads */
 		return -EIO;

 	err = mutex_lock_interruptible(&ab3100->access_mutex);
 	if (err)
 		return err;

 	/*
 	 * Paged read also require an I2C "stop" command.
 	 */
 	err = i2c_master_send(ab3100->i2c_client, &first_reg, 1);
 	if (err < 0) {
 		dev_err(ab3100->dev,
 			"write error (send first register address): %d\n",
 			err);
 		goto get_reg_page_out_unlock;
 	} else if (err != 1) {
 		dev_err(ab3100->dev,
 			"write error (send first register address) "
 			"%d bytes transferred (expected 1)\n",
 			err);
 		err = -EIO;
 		goto get_reg_page_out_unlock;
 	}

 	err = i2c_master_recv(ab3100->i2c_client, regvals, numregs);
 	if (err < 0) {
 		dev_err(ab3100->dev,
 			"write error (read register page): %d\n",
 			err);
 		goto get_reg_page_out_unlock;
 	} else if (err != numregs) {
 		dev_err(ab3100->dev,
 			"write error (read register page) "
 			"%d bytes transferred (expected %d)\n",
 			err, numregs);
 		err = -EIO;
 		goto get_reg_page_out_unlock;
 	}

 	/* All is well */
 	err = 0;

  get_reg_page_out_unlock:
 	mutex_unlock(&ab3100->access_mutex);
 	return err;
 }

 static int get_register_page_interruptible(struct device *dev, u8 bank,
 	u8 first_reg, u8 *regvals, u8 numregs)
 {
 	struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);

 	return ab3100_get_register_page_interruptible(ab3100,
 			first_reg, regvals, numregs);
 }

 static int ab3100_mask_and_set_register_interruptible(struct ab3100 *ab3100,
 				 u8 reg, u8 andmask, u8 ormask)
 {
 	u8 regandval[2] = {reg, 0};
 	int err;

 	err = mutex_lock_interruptible(&ab3100->access_mutex);
 	if (err)
 		return err;

 	/* First read out the target register */
 	err = i2c_master_send(ab3100->i2c_client, &reg, 1);
 	if (err < 0) {
 		dev_err(ab3100->dev,
 			"write error (maskset send address): %d\n",
 			err);
 		goto get_maskset_unlock;
 	} else if (err != 1) {
 		dev_err(ab3100->dev,
 			"write error (maskset send address) "
 			"%d bytes transferred (expected 1)\n",
 			err);
 		err = -EIO;
 		goto get_maskset_unlock;
 	}

 	err = i2c_master_recv(ab3100->i2c_client, &regandval[1], 1);
 	if (err < 0) {
 		dev_err(ab3100->dev,
 			"write error (maskset read register): %d\n",
 			err);
 		goto get_maskset_unlock;
 	} else if (err != 1) {
 		dev_err(ab3100->dev,
 			"write error (maskset read register) "
 			"%d bytes transferred (expected 1)\n",
 			err);
 		err = -EIO;
 		goto get_maskset_unlock;
 	}

 	/* Modify the register */
 	regandval[1] &= andmask;
 	regandval[1] |= ormask;

 	/* Write the register */
 	err = i2c_master_send(ab3100->i2c_client, regandval, 2);
 	if (err < 0) {
 		dev_err(ab3100->dev,
 			"write error (write register): %d\n",
 			err);
 		goto get_maskset_unlock;
 	} else if (err != 2) {
 		dev_err(ab3100->dev,
 			"write error (write register) "
 			"%d bytes transferred (expected 2)\n",
 			err);
 		err = -EIO;
 		goto get_maskset_unlock;
 	}

 	/* All is well */
 	err = 0;

  get_maskset_unlock:
 	mutex_unlock(&ab3100->access_mutex);
 	return err;
 }

 static int mask_and_set_register_interruptible(struct device *dev, u8 bank,
 	u8 reg, u8 bitmask, u8 bitvalues)
 {
 	struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);

 	return ab3100_mask_and_set_register_interruptible(ab3100,
 			reg, bitmask, (bitmask & bitvalues));
 }

 /*
  * Register a simple callback for handling any AB3100 events.
  */
 int ab3100_event_register(struct ab3100 *ab3100,
 			  struct notifier_block *nb)
 {
 	return blocking_notifier_chain_register(&ab3100->event_subscribers,
 					       nb);
 }
 EXPORT_SYMBOL(ab3100_event_register);

 /*
  * Remove a previously registered callback.
  */
 int ab3100_event_unregister(struct ab3100 *ab3100,
 			    struct notifier_block *nb)
 {
   return blocking_notifier_chain_unregister(&ab3100->event_subscribers,
 					    nb);
 }
 EXPORT_SYMBOL(ab3100_event_unregister);


 static int ab3100_event_registers_startup_state_get(struct device *dev,
 					     u8 *event)
 {
 	struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
 	if (!ab3100->startup_events_read)
 		return -EAGAIN; /* Try again later */
 	memcpy(event, ab3100->startup_events, 3);
 	return 0;
 }

 static struct abx500_ops ab3100_ops = {
 	.get_chip_id = ab3100_get_chip_id,
 	.set_register = set_register_interruptible,
 	.get_register = get_register_interruptible,
 	.get_register_page = get_register_page_interruptible,
 	.set_register_page = NULL,
 	.mask_and_set_register = mask_and_set_register_interruptible,
 	.event_registers_startup_state_get =
 		ab3100_event_registers_startup_state_get,
 	.startup_irq_enabled = NULL,
 };

 /*
  * This is a threaded interrupt handler so we can make some
  * I2C calls etc.
  */
 static irqreturn_t ab3100_irq_handler(int irq, void *data)
 {
 	struct ab3100 *ab3100 = data;
 	u8 event_regs[3];
 	u32 fatevent;
 	int err;

 	err = ab3100_get_register_page_interruptible(ab3100, AB3100_EVENTA1,
 				       event_regs, 3);
 	if (err)
 		goto err_event;

 	fatevent = (event_regs[0] << 16) |
 		(event_regs[1] << 8) |
 		event_regs[2];

 	if (!ab3100->startup_events_read) {
 		ab3100->startup_events[0] = event_regs[0];
 		ab3100->startup_events[1] = event_regs[1];
 		ab3100->startup_events[2] = event_regs[2];
 		ab3100->startup_events_read = true;
 	}
 	/*
 	 * The notified parties will have to mask out the events
 	 * they're interested in and react to them. They will be
 	 * notified on all events, then they use the fatevent value
 	 * to determine if they're interested.
 	 */
 	blocking_notifier_call_chain(&ab3100->event_subscribers,
 				     fatevent, NULL);

 	dev_dbg(ab3100->dev,
 		"IRQ Event: 0x%08x\n", fatevent);

 	return IRQ_HANDLED;

  err_event:
 	dev_dbg(ab3100->dev,
 		"error reading event status\n");
 	return IRQ_HANDLED;
 }

 #ifdef CONFIG_DEBUG_FS
 /*
  * Some debugfs entries only exposed if we're using debug
  */
 static int ab3100_registers_print(struct seq_file *s, void *p)
 {
 	struct ab3100 *ab3100 = s->private;
 	u8 value;
 	u8 reg;

 	seq_printf(s, "AB3100 registers:\n");

 	for (reg = 0; reg < 0xff; reg++) {
 		ab3100_get_register_interruptible(ab3100, reg, &value);
 		seq_printf(s, "[0x%x]:  0x%x\n", reg, value);
 	}
 	return 0;
 }

 static int ab3100_registers_open(struct inode *inode, struct file *file)
 {
 	return single_open(file, ab3100_registers_print, inode->i_private);
 }

 static const struct file_operations ab3100_registers_fops = {
 	.open = ab3100_registers_open,
 	.read = seq_read,
 	.llseek = seq_lseek,
 	.release = single_release,
 	.owner = THIS_MODULE,
 };

 struct ab3100_get_set_reg_priv {
 	struct ab3100 *ab3100;
 	bool mode;
 };

 static ssize_t ab3100_get_set_reg(struct file *file,
 				  const char __user *user_buf,
 				  size_t count, loff_t *ppos)
 {
 	struct ab3100_get_set_reg_priv *priv = file->private_data;
 	struct ab3100 *ab3100 = priv->ab3100;
 	char buf[32];
 	ssize_t buf_size;
 	int regp;
 	u8 user_reg;
 	int err;
 	int i = 0;

 	/* 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;

 	/*
 	 * The idea is here to parse a string which is either
 	 * "0xnn" for reading a register, or "0xaa 0xbb" for
 	 * writing 0xbb to the register 0xaa. First move past
 	 * whitespace and then begin to parse the register.
 	 */
 	while ((i < buf_size) && (buf[i] == ' '))
 		i++;
 	regp = i;

 	/*
 	 * Advance pointer to end of string then terminate
 	 * the register string. This is needed to satisfy
 	 * the kstrtou8() function.
 	 */
 	while ((i < buf_size) && (buf[i] != ' '))
 		i++;
 	buf[i] = '\0';

 	err = kstrtou8(&buf[regp], 16, &user_reg);
 	if (err)
 		return err;

 	/* Either we read or we write a register here */
 	if (!priv->mode) {
 		/* Reading */
 		u8 regvalue;

 		ab3100_get_register_interruptible(ab3100, user_reg, &regvalue);

 		dev_info(ab3100->dev,
 			 "debug read AB3100 reg[0x%02x]: 0x%02x\n",
 			 user_reg, regvalue);
 	} else {
 		int valp;
 		u8 user_value;
 		u8 regvalue;

 		/*
 		 * Writing, we need some value to write to
 		 * the register so keep parsing the string
 		 * from userspace.
 		 */
 		i++;
 		while ((i < buf_size) && (buf[i] == ' '))
 			i++;
 		valp = i;
 		while ((i < buf_size) && (buf[i] != ' '))
 			i++;
 		buf[i] = '\0';

 		err = kstrtou8(&buf[valp], 16, &user_value);
 		if (err)
 			return err;

 		ab3100_set_register_interruptible(ab3100, user_reg, user_value);
 		ab3100_get_register_interruptible(ab3100, user_reg, &regvalue);

 		dev_info(ab3100->dev,
 			 "debug write reg[0x%02x] with 0x%02x, "
 			 "after readback: 0x%02x\n",
 			 user_reg, user_value, regvalue);
 	}
 	return buf_size;
 }

 static const struct file_operations ab3100_get_set_reg_fops = {
 	.open = simple_open,
 	.write = ab3100_get_set_reg,
 	.llseek = noop_llseek,
 };

 static struct dentry *ab3100_dir;
 static struct dentry *ab3100_reg_file;
 static struct ab3100_get_set_reg_priv ab3100_get_priv;
 static struct dentry *ab3100_get_reg_file;
 static struct ab3100_get_set_reg_priv ab3100_set_priv;
 static struct dentry *ab3100_set_reg_file;

 static void ab3100_setup_debugfs(struct ab3100 *ab3100)
 {
 	int err;

 	ab3100_dir = debugfs_create_dir("ab3100", NULL);
 	if (!ab3100_dir)
 		goto exit_no_debugfs;

 	ab3100_reg_file = debugfs_create_file("registers",
 				S_IRUGO, ab3100_dir, ab3100,
 				&ab3100_registers_fops);
 	if (!ab3100_reg_file) {
 		err = -ENOMEM;
 		goto exit_destroy_dir;
 	}

 	ab3100_get_priv.ab3100 = ab3100;
 	ab3100_get_priv.mode = false;
 	ab3100_get_reg_file = debugfs_create_file("get_reg",
 				S_IWUSR, ab3100_dir, &ab3100_get_priv,
 				&ab3100_get_set_reg_fops);
 	if (!ab3100_get_reg_file) {
 		err = -ENOMEM;
 		goto exit_destroy_reg;
 	}

 	ab3100_set_priv.ab3100 = ab3100;
 	ab3100_set_priv.mode = true;
 	ab3100_set_reg_file = debugfs_create_file("set_reg",
 				S_IWUSR, ab3100_dir, &ab3100_set_priv,
 				&ab3100_get_set_reg_fops);
 	if (!ab3100_set_reg_file) {
 		err = -ENOMEM;
 		goto exit_destroy_get_reg;
 	}
 	return;

  exit_destroy_get_reg:
 	debugfs_remove(ab3100_get_reg_file);
  exit_destroy_reg:
 	debugfs_remove(ab3100_reg_file);
  exit_destroy_dir:
 	debugfs_remove(ab3100_dir);
  exit_no_debugfs:
 	return;
 }
 static inline void ab3100_remove_debugfs(void)
 {
 	debugfs_remove(ab3100_set_reg_file);
 	debugfs_remove(ab3100_get_reg_file);
 	debugfs_remove(ab3100_reg_file);
 	debugfs_remove(ab3100_dir);
 }
 #else
 static inline void ab3100_setup_debugfs(struct ab3100 *ab3100)
 {
 }
 static inline void ab3100_remove_debugfs(void)
 {
 }
 #endif

 /*
  * Basic set-up, datastructure creation/destruction and I2C interface.
  * This sets up a default config in the AB3100 chip so that it
  * will work as expected.
  */

 struct ab3100_init_setting {
 	u8 abreg;
 	u8 setting;
 };

 static const struct ab3100_init_setting ab3100_init_settings[] = {
 	{
 		.abreg = AB3100_MCA,
 		.setting = 0x01
 	}, {
 		.abreg = AB3100_MCB,
 		.setting = 0x30
 	}, {
 		.abreg = AB3100_IMRA1,
 		.setting = 0x00
 	}, {
 		.abreg = AB3100_IMRA2,
 		.setting = 0xFF
 	}, {
 		.abreg = AB3100_IMRA3,
 		.setting = 0x01
 	}, {
 		.abreg = AB3100_IMRB1,
 		.setting = 0xBF
 	}, {
 		.abreg = AB3100_IMRB2,
 		.setting = 0xFF
 	}, {
 		.abreg = AB3100_IMRB3,
 		.setting = 0xFF
 	}, {
 		.abreg = AB3100_SUP,
 		.setting = 0x00
 	}, {
 		.abreg = AB3100_DIS,
 		.setting = 0xF0
 	}, {
 		.abreg = AB3100_D0C,
 		.setting = 0x00
 	}, {
 		.abreg = AB3100_D1C,
 		.setting = 0x00
 	}, {
 		.abreg = AB3100_D2C,
 		.setting = 0x00
 	}, {
 		.abreg = AB3100_D3C,
 		.setting = 0x00
 	},
 };

 static int ab3100_setup(struct ab3100 *ab3100)
 {
 	int err = 0;
 	int i;

 	for (i = 0; i < ARRAY_SIZE(ab3100_init_settings); i++) {
 		err = ab3100_set_register_interruptible(ab3100,
 					  ab3100_init_settings[i].abreg,
 					  ab3100_init_settings[i].setting);
 		if (err)
 			goto exit_no_setup;
 	}

 	/*
 	 * Special trick to make the AB3100 use the 32kHz clock (RTC)
 	 * bit 3 in test register 0x02 is a special, undocumented test
 	 * register bit that only exist in AB3100 P1E
 	 */
 	if (ab3100->chip_id == 0xc4) {
 		dev_warn(ab3100->dev,
 			 "AB3100 P1E variant detected, "
 			 "forcing chip to 32KHz\n");
 		err = ab3100_set_test_register_interruptible(ab3100,
 			0x02, 0x08);
 	}

  exit_no_setup:
 	return err;
 }

 /* The subdevices of the AB3100 */
 static struct mfd_cell ab3100_devs[] = {
 	{
 		.name = "ab3100-dac",
 		.id = -1,
 	},
 	{
 		.name = "ab3100-leds",
 		.id = -1,
 	},
 	{
 		.name = "ab3100-power",
 		.id = -1,
 	},
 	{
 		.name = "ab3100-regulators",
 		.of_compatible = "stericsson,ab3100-regulators",
 		.id = -1,
 	},
 	{
 		.name = "ab3100-sim",
 		.id = -1,
 	},
 	{
 		.name = "ab3100-uart",
 		.id = -1,
 	},
 	{
 		.name = "ab3100-rtc",
 		.id = -1,
 	},
 	{
 		.name = "ab3100-charger",
 		.id = -1,
 	},
 	{
 		.name = "ab3100-boost",
 		.id = -1,
 	},
 	{
 		.name = "ab3100-adc",
 		.id = -1,
 	},
 	{
 		.name = "ab3100-fuelgauge",
 		.id = -1,
 	},
 	{
 		.name = "ab3100-vibrator",
 		.id = -1,
 	},
 	{
 		.name = "ab3100-otp",
 		.id = -1,
 	},
 	{
 		.name = "ab3100-codec",
 		.id = -1,
 	},
 };

 struct ab_family_id {
 	u8	id;
 	char	*name;
 };

 static const struct ab_family_id ids[] = {
 	/* AB3100 */
 	{
 		.id = 0xc0,
 		.name = "P1A"
 	}, {
 		.id = 0xc1,
 		.name = "P1B"
 	}, {
 		.id = 0xc2,
 		.name = "P1C"
 	}, {
 		.id = 0xc3,
 		.name = "P1D"
 	}, {
 		.id = 0xc4,
 		.name = "P1E"
 	}, {
 		.id = 0xc5,
 		.name = "P1F/R1A"
 	}, {
 		.id = 0xc6,
 		.name = "P1G/R1A"
 	}, {
 		.id = 0xc7,
 		.name = "P2A/R2A"
 	}, {
 		.id = 0xc8,
 		.name = "P2B/R2B"
 	},
 	/* AB3000 variants, not supported */
 	{
 		.id = 0xa0
 	}, {
 		.id = 0xa1
 	}, {
 		.id = 0xa2
 	}, {
 		.id = 0xa3
 	}, {
 		.id = 0xa4
 	}, {
 		.id = 0xa5
 	}, {
 		.id = 0xa6
 	}, {
 		.id = 0xa7
 	},
 	/* Terminator */
 	{
 		.id = 0x00,
 	},
 };

 static int ab3100_probe(struct i2c_client *client,
 				  const struct i2c_device_id *id)
 {
 	struct ab3100 *ab3100;
 	struct ab3100_platform_data *ab3100_plf_data =
 		dev_get_platdata(&client->dev);
 	int err;
 	int i;

 	ab3100 = devm_kzalloc(&client->dev, sizeof(struct ab3100), GFP_KERNEL);
 	if (!ab3100) {
 		dev_err(&client->dev, "could not allocate AB3100 device\n");
 		return -ENOMEM;
 	}

 	/* Initialize data structure */
 	mutex_init(&ab3100->access_mutex);
 	BLOCKING_INIT_NOTIFIER_HEAD(&ab3100->event_subscribers);

 	ab3100->i2c_client = client;
 	ab3100->dev = &ab3100->i2c_client->dev;

 	i2c_set_clientdata(client, ab3100);

 	/* Read chip ID register */
 	err = ab3100_get_register_interruptible(ab3100, AB3100_CID,
 						&ab3100->chip_id);
 	if (err) {
 		dev_err(&client->dev,
 			"could not communicate with the AB3100 analog "
 			"baseband chip\n");
 		goto exit_no_detect;
 	}

 	for (i = 0; ids[i].id != 0x0; i++) {
 		if (ids[i].id == ab3100->chip_id) {
 			if (ids[i].name != NULL) {
 				snprintf(&ab3100->chip_name[0],
 					 sizeof(ab3100->chip_name) - 1,
 					 "AB3100 %s",
 					 ids[i].name);
 				break;
 			} else {
 				dev_err(&client->dev,
 					"AB3000 is not supported\n");
 				goto exit_no_detect;
 			}
 		}
 	}

 	if (ids[i].id == 0x0) {
 		dev_err(&client->dev, "unknown analog baseband chip id: 0x%x\n",
 			ab3100->chip_id);
 		dev_err(&client->dev, "accepting it anyway. Please update "
 			"the driver.\n");
 		goto exit_no_detect;
 	}

 	dev_info(&client->dev, "Detected chip: %s\n",
 		 &ab3100->chip_name[0]);

 	/* Attach a second dummy i2c_client to the test register address */
 	ab3100->testreg_client = i2c_new_dummy(client->adapter,
 					       client->addr + 1);
 	if (!ab3100->testreg_client) {
 		err = -ENOMEM;
 		goto exit_no_testreg_client;
 	}

 	err = ab3100_setup(ab3100);
 	if (err)
 		goto exit_no_setup;

 	err = devm_request_threaded_irq(&client->dev,
 					client->irq, NULL, ab3100_irq_handler,
 					IRQF_ONESHOT, "ab3100-core", ab3100);
 	if (err)
 		goto exit_no_irq;

 	err = abx500_register_ops(&client->dev, &ab3100_ops);
 	if (err)
 		goto exit_no_ops;

 	/* Set up and register the platform devices. */
 	for (i = 0; i < ARRAY_SIZE(ab3100_devs); i++) {
 		ab3100_devs[i].platform_data = ab3100_plf_data;
 		ab3100_devs[i].pdata_size = sizeof(struct ab3100_platform_data);
 	}

 	err = mfd_add_devices(&client->dev, 0, ab3100_devs,
 			      ARRAY_SIZE(ab3100_devs), NULL, 0, NULL);

 	ab3100_setup_debugfs(ab3100);

 	return 0;

  exit_no_ops:
  exit_no_irq:
  exit_no_setup:
 	i2c_unregister_device(ab3100->testreg_client);
  exit_no_testreg_client:
  exit_no_detect:
 	return err;
 }

 static int ab3100_remove(struct i2c_client *client)
 {
 	struct ab3100 *ab3100 = i2c_get_clientdata(client);

 	/* Unregister subdevices */
 	mfd_remove_devices(&client->dev);
 	ab3100_remove_debugfs();
 	i2c_unregister_device(ab3100->testreg_client);
 	return 0;
 }

 static const struct i2c_device_id ab3100_id[] = {
 	{ "ab3100", 0 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, ab3100_id);

 static struct i2c_driver ab3100_driver = {
 	.driver = {
 		.name	= "ab3100",
 		.owner	= THIS_MODULE,
 	},
 	.id_table	= ab3100_id,
 	.probe		= ab3100_probe,
 	.remove		= ab3100_remove,
 };

 static int __init ab3100_i2c_init(void)
 {
 	return i2c_add_driver(&ab3100_driver);
 }

 static void __exit ab3100_i2c_exit(void)
 {
 	i2c_del_driver(&ab3100_driver);
 }

 subsys_initcall(ab3100_i2c_init);
 module_exit(ab3100_i2c_exit);

 MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>");
 MODULE_DESCRIPTION("AB3100 core driver");
 MODULE_LICENSE("GPL");
	/*
	* Copyright (C) 2007-2010 ST-Ericsson
	* License terms: GNU General Public License (GPL) version 2
	* Low-level core for exclusive access to the AB3100 IC on the I2C bus
	* and some basic chip-configuration.
	* Author: Linus Walleij <linus.walleij@stericsson.com>
	*/

	#include <linux/i2c.h>
	#include <linux/mutex.h>
	#include <linux/list.h>
	#include <linux/notifier.h>
	#include <linux/slab.h>
	#include <linux/err.h>
	#include <linux/module.h>
	#include <linux/platform_device.h>
	#include <linux/device.h>
	#include <linux/interrupt.h>
	#include <linux/random.h>
	#include <linux/debugfs.h>
	#include <linux/seq_file.h>
	#include <linux/uaccess.h>
	#include <linux/mfd/core.h>
	#include <linux/mfd/ab3100.h>
	#include <linux/mfd/abx500.h>

	/* These are the only registers inside AB3100 used in this main file */

	/* Interrupt event registers */
	#define AB3100_EVENTA1 0x21
	#define AB3100_EVENTA2 0x22
	#define AB3100_EVENTA3 0x23

	/* AB3100 DAC converter registers */
	#define AB3100_DIS 0x00
	#define AB3100_D0C 0x01
	#define AB3100_D1C 0x02
	#define AB3100_D2C 0x03
	#define AB3100_D3C 0x04

	/* Chip ID register */
	#define AB3100_CID 0x20

	/* AB3100 interrupt registers */
	#define AB3100_IMRA1 0x24
	#define AB3100_IMRA2 0x25
	#define AB3100_IMRA3 0x26
	#define AB3100_IMRB1 0x2B
	#define AB3100_IMRB2 0x2C
	#define AB3100_IMRB3 0x2D

	/* System Power Monitoring and control registers */
	#define AB3100_MCA 0x2E
	#define AB3100_MCB 0x2F

	/* SIM power up */
	#define AB3100_SUP 0x50

	/*
	* I2C communication
	*
	* The AB3100 is usually assigned address 0x48 (7-bit)
	* The chip is defined in the platform i2c_board_data section.
	*/
	static int ab3100_get_chip_id(struct device *dev)
	{
	struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);

	return (int)ab3100->chip_id;
	}

	static int ab3100_set_register_interruptible(struct ab3100 *ab3100,
	u8 reg, u8 regval)
	{
	u8 regandval[2] = {reg, regval};
	int err;

	err = mutex_lock_interruptible(&ab3100->access_mutex);
	if (err)
	return err;

	/*
	* A two-byte write message with the first byte containing the register
	* number and the second byte containing the value to be written
	* effectively sets a register in the AB3100.
	*/
	err = i2c_master_send(ab3100->i2c_client, regandval, 2);
	if (err < 0) {
	dev_err(ab3100->dev,
	"write error (write register): %d\n",
	err);
	} else if (err != 2) {
	dev_err(ab3100->dev,
	"write error (write register) "
	"%d bytes transferred (expected 2)\n",
	err);
	err = -EIO;
	} else {
	/* All is well */
	err = 0;
	}
	mutex_unlock(&ab3100->access_mutex);
	return err;
	}

	static int set_register_interruptible(struct device *dev,
	u8 bank, u8 reg, u8 value)
	{
	struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);

	return ab3100_set_register_interruptible(ab3100, reg, value);
	}

	/*
	* The test registers exist at an I2C bus address up one
	* from the ordinary base. They are not supposed to be used
	* in production code, but sometimes you have to do that
	* anyway. It's currently only used from this file so declare
	* it static and do not export.
	*/
	static int ab3100_set_test_register_interruptible(struct ab3100 *ab3100,
	u8 reg, u8 regval)
	{
	u8 regandval[2] = {reg, regval};
	int err;

	err = mutex_lock_interruptible(&ab3100->access_mutex);
	if (err)
	return err;

	err = i2c_master_send(ab3100->testreg_client, regandval, 2);
	if (err < 0) {
	dev_err(ab3100->dev,
	"write error (write test register): %d\n",
	err);
	} else if (err != 2) {
	dev_err(ab3100->dev,
	"write error (write test register) "
	"%d bytes transferred (expected 2)\n",
	err);
	err = -EIO;
	} else {
	/* All is well */
	err = 0;
	}
	mutex_unlock(&ab3100->access_mutex);

	return err;
	}

	static int ab3100_get_register_interruptible(struct ab3100 *ab3100,
	u8 reg, u8 *regval)
	{
	int err;

	err = mutex_lock_interruptible(&ab3100->access_mutex);
	if (err)
	return err;

	/*
	* AB3100 require an I2C "stop" command between each message, else
	* it will not work. The only way of achieveing this with the
	* message transport layer is to send the read and write messages
	* separately.
	*/
	err = i2c_master_send(ab3100->i2c_client, &reg, 1);
	if (err < 0) {
	dev_err(ab3100->dev,
	"write error (send register address): %d\n",
	err);
	goto get_reg_out_unlock;
	} else if (err != 1) {
	dev_err(ab3100->dev,
	"write error (send register address) "
	"%d bytes transferred (expected 1)\n",
	err);
	err = -EIO;
	goto get_reg_out_unlock;
	} else {
	/* All is well */
	err = 0;
	}

	err = i2c_master_recv(ab3100->i2c_client, regval, 1);
	if (err < 0) {
	dev_err(ab3100->dev,
	"write error (read register): %d\n",
	err);
	goto get_reg_out_unlock;
	} else if (err != 1) {
	dev_err(ab3100->dev,
	"write error (read register) "
	"%d bytes transferred (expected 1)\n",
	err);
	err = -EIO;
	goto get_reg_out_unlock;
	} else {
	/* All is well */
	err = 0;
	}

	get_reg_out_unlock:
	mutex_unlock(&ab3100->access_mutex);
	return err;
	}

	static int get_register_interruptible(struct device *dev, u8 bank, u8 reg,
	u8 *value)
	{
	struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);

	return ab3100_get_register_interruptible(ab3100, reg, value);
	}

	static int ab3100_get_register_page_interruptible(struct ab3100 *ab3100,
	u8 first_reg, u8 *regvals, u8 numregs)
	{
	int err;

	if (ab3100->chip_id == 0xa0 \|\|
	ab3100->chip_id == 0xa1)
	/* These don't support paged reads */
	return -EIO;

	err = mutex_lock_interruptible(&ab3100->access_mutex);
	if (err)
	return err;

	/*
	* Paged read also require an I2C "stop" command.
	*/
	err = i2c_master_send(ab3100->i2c_client, &first_reg, 1);
	if (err < 0) {
	dev_err(ab3100->dev,
	"write error (send first register address): %d\n",
	err);
	goto get_reg_page_out_unlock;
	} else if (err != 1) {
	dev_err(ab3100->dev,
	"write error (send first register address) "
	"%d bytes transferred (expected 1)\n",
	err);
	err = -EIO;
	goto get_reg_page_out_unlock;
	}

	err = i2c_master_recv(ab3100->i2c_client, regvals, numregs);
	if (err < 0) {
	dev_err(ab3100->dev,
	"write error (read register page): %d\n",
	err);
	goto get_reg_page_out_unlock;
	} else if (err != numregs) {
	dev_err(ab3100->dev,
	"write error (read register page) "
	"%d bytes transferred (expected %d)\n",
	err, numregs);
	err = -EIO;
	goto get_reg_page_out_unlock;
	}

	/* All is well */
	err = 0;

	get_reg_page_out_unlock:
	mutex_unlock(&ab3100->access_mutex);
	return err;
	}

	static int get_register_page_interruptible(struct device *dev, u8 bank,
	u8 first_reg, u8 *regvals, u8 numregs)
	{
	struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);

	return ab3100_get_register_page_interruptible(ab3100,
	first_reg, regvals, numregs);
	}

	static int ab3100_mask_and_set_register_interruptible(struct ab3100 *ab3100,
	u8 reg, u8 andmask, u8 ormask)
	{
	u8 regandval[2] = {reg, 0};
	int err;

	err = mutex_lock_interruptible(&ab3100->access_mutex);
	if (err)
	return err;

	/* First read out the target register */
	err = i2c_master_send(ab3100->i2c_client, &reg, 1);
	if (err < 0) {
	dev_err(ab3100->dev,
	"write error (maskset send address): %d\n",
	err);
	goto get_maskset_unlock;
	} else if (err != 1) {
	dev_err(ab3100->dev,
	"write error (maskset send address) "
	"%d bytes transferred (expected 1)\n",
	err);
	err = -EIO;
	goto get_maskset_unlock;
	}

	err = i2c_master_recv(ab3100->i2c_client, &regandval[1], 1);
	if (err < 0) {
	dev_err(ab3100->dev,
	"write error (maskset read register): %d\n",
	err);
	goto get_maskset_unlock;
	} else if (err != 1) {
	dev_err(ab3100->dev,
	"write error (maskset read register) "
	"%d bytes transferred (expected 1)\n",
	err);
	err = -EIO;
	goto get_maskset_unlock;
	}

	/* Modify the register */
	regandval[1] &= andmask;
	regandval[1] \|= ormask;

	/* Write the register */
	err = i2c_master_send(ab3100->i2c_client, regandval, 2);
	if (err < 0) {
	dev_err(ab3100->dev,
	"write error (write register): %d\n",
	err);
	goto get_maskset_unlock;
	} else if (err != 2) {
	dev_err(ab3100->dev,
	"write error (write register) "
	"%d bytes transferred (expected 2)\n",
	err);
	err = -EIO;
	goto get_maskset_unlock;
	}

	/* All is well */
	err = 0;

	get_maskset_unlock:
	mutex_unlock(&ab3100->access_mutex);
	return err;
	}

	static int mask_and_set_register_interruptible(struct device *dev, u8 bank,
	u8 reg, u8 bitmask, u8 bitvalues)
	{
	struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);

	return ab3100_mask_and_set_register_interruptible(ab3100,
	reg, bitmask, (bitmask & bitvalues));
	}

	/*
	* Register a simple callback for handling any AB3100 events.
	*/
	int ab3100_event_register(struct ab3100 *ab3100,
	struct notifier_block *nb)
	{
	return blocking_notifier_chain_register(&ab3100->event_subscribers,
	nb);
	}
	EXPORT_SYMBOL(ab3100_event_register);

	/*
	* Remove a previously registered callback.
	*/
	int ab3100_event_unregister(struct ab3100 *ab3100,
	struct notifier_block *nb)
	{
	return blocking_notifier_chain_unregister(&ab3100->event_subscribers,
	nb);
	}
	EXPORT_SYMBOL(ab3100_event_unregister);


	static int ab3100_event_registers_startup_state_get(struct device *dev,
	u8 *event)
	{
	struct ab3100 *ab3100 = dev_get_drvdata(dev->parent);
	if (!ab3100->startup_events_read)
	return -EAGAIN; /* Try again later */
	memcpy(event, ab3100->startup_events, 3);
	return 0;
	}

	static struct abx500_ops ab3100_ops = {
	.get_chip_id = ab3100_get_chip_id,
	.set_register = set_register_interruptible,
	.get_register = get_register_interruptible,
	.get_register_page = get_register_page_interruptible,
	.set_register_page = NULL,
	.mask_and_set_register = mask_and_set_register_interruptible,
	.event_registers_startup_state_get =
	ab3100_event_registers_startup_state_get,
	.startup_irq_enabled = NULL,
	};

	/*
	* This is a threaded interrupt handler so we can make some
	* I2C calls etc.
	*/
	static irqreturn_t ab3100_irq_handler(int irq, void *data)
	{
	struct ab3100 *ab3100 = data;
	u8 event_regs[3];
	u32 fatevent;
	int err;

	err = ab3100_get_register_page_interruptible(ab3100, AB3100_EVENTA1,
	event_regs, 3);
	if (err)
	goto err_event;

	fatevent = (event_regs[0] << 16) \|
	(event_regs[1] << 8) \|
	event_regs[2];

	if (!ab3100->startup_events_read) {
	ab3100->startup_events[0] = event_regs[0];
	ab3100->startup_events[1] = event_regs[1];
	ab3100->startup_events[2] = event_regs[2];
	ab3100->startup_events_read = true;
	}
	/*
	* The notified parties will have to mask out the events
	* they're interested in and react to them. They will be
	* notified on all events, then they use the fatevent value
	* to determine if they're interested.
	*/
	blocking_notifier_call_chain(&ab3100->event_subscribers,
	fatevent, NULL);

	dev_dbg(ab3100->dev,
	"IRQ Event: 0x%08x\n", fatevent);

	return IRQ_HANDLED;

	err_event:
	dev_dbg(ab3100->dev,
	"error reading event status\n");
	return IRQ_HANDLED;
	}

	#ifdef CONFIG_DEBUG_FS
	/*
	* Some debugfs entries only exposed if we're using debug
	*/
	static int ab3100_registers_print(struct seq_file s, void p)
	{
	struct ab3100 *ab3100 = s->private;
	u8 value;
	u8 reg;

	seq_printf(s, "AB3100 registers:\n");

	for (reg = 0; reg < 0xff; reg++) {
	ab3100_get_register_interruptible(ab3100, reg, &value);
	seq_printf(s, "[0x%x]: 0x%x\n", reg, value);
	}
	return 0;
	}

	static int ab3100_registers_open(struct inode inode, struct file file)
	{
	return single_open(file, ab3100_registers_print, inode->i_private);
	}

	static const struct file_operations ab3100_registers_fops = {
	.open = ab3100_registers_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
	.owner = THIS_MODULE,
	};

	struct ab3100_get_set_reg_priv {
	struct ab3100 *ab3100;
	bool mode;
	};

	static ssize_t ab3100_get_set_reg(struct file *file,
	const char __user *user_buf,
	size_t count, loff_t *ppos)
	{
	struct ab3100_get_set_reg_priv *priv = file->private_data;
	struct ab3100 *ab3100 = priv->ab3100;
	char buf[32];
	ssize_t buf_size;
	int regp;
	u8 user_reg;
	int err;
	int i = 0;

	/* 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;

	/*
	* The idea is here to parse a string which is either
	* "0xnn" for reading a register, or "0xaa 0xbb" for
	* writing 0xbb to the register 0xaa. First move past
	* whitespace and then begin to parse the register.
	*/
	while ((i < buf_size) && (buf[i] == ' '))
	i++;
	regp = i;

	/*
	* Advance pointer to end of string then terminate
	* the register string. This is needed to satisfy
	* the kstrtou8() function.
	*/
	while ((i < buf_size) && (buf[i] != ' '))
	i++;
	buf[i] = '\0';

	err = kstrtou8(&buf[regp], 16, &user_reg);
	if (err)
	return err;

	/* Either we read or we write a register here */
	if (!priv->mode) {
	/* Reading */
	u8 regvalue;

	ab3100_get_register_interruptible(ab3100, user_reg, &regvalue);

	dev_info(ab3100->dev,
	"debug read AB3100 reg[0x%02x]: 0x%02x\n",
	user_reg, regvalue);
	} else {
	int valp;
	u8 user_value;
	u8 regvalue;

	/*
	* Writing, we need some value to write to
	* the register so keep parsing the string
	* from userspace.
	*/
	i++;
	while ((i < buf_size) && (buf[i] == ' '))
	i++;
	valp = i;
	while ((i < buf_size) && (buf[i] != ' '))
	i++;
	buf[i] = '\0';

	err = kstrtou8(&buf[valp], 16, &user_value);
	if (err)
	return err;

	ab3100_set_register_interruptible(ab3100, user_reg, user_value);
	ab3100_get_register_interruptible(ab3100, user_reg, &regvalue);

	dev_info(ab3100->dev,
	"debug write reg[0x%02x] with 0x%02x, "
	"after readback: 0x%02x\n",
	user_reg, user_value, regvalue);
	}
	return buf_size;
	}

	static const struct file_operations ab3100_get_set_reg_fops = {
	.open = simple_open,
	.write = ab3100_get_set_reg,
	.llseek = noop_llseek,
	};

	static struct dentry *ab3100_dir;
	static struct dentry *ab3100_reg_file;
	static struct ab3100_get_set_reg_priv ab3100_get_priv;
	static struct dentry *ab3100_get_reg_file;
	static struct ab3100_get_set_reg_priv ab3100_set_priv;
	static struct dentry *ab3100_set_reg_file;

	static void ab3100_setup_debugfs(struct ab3100 *ab3100)
	{
	int err;

	ab3100_dir = debugfs_create_dir("ab3100", NULL);
	if (!ab3100_dir)
	goto exit_no_debugfs;

	ab3100_reg_file = debugfs_create_file("registers",
	S_IRUGO, ab3100_dir, ab3100,
	&ab3100_registers_fops);
	if (!ab3100_reg_file) {
	err = -ENOMEM;
	goto exit_destroy_dir;
	}

	ab3100_get_priv.ab3100 = ab3100;
	ab3100_get_priv.mode = false;
	ab3100_get_reg_file = debugfs_create_file("get_reg",
	S_IWUSR, ab3100_dir, &ab3100_get_priv,
	&ab3100_get_set_reg_fops);
	if (!ab3100_get_reg_file) {
	err = -ENOMEM;
	goto exit_destroy_reg;
	}

	ab3100_set_priv.ab3100 = ab3100;
	ab3100_set_priv.mode = true;
	ab3100_set_reg_file = debugfs_create_file("set_reg",
	S_IWUSR, ab3100_dir, &ab3100_set_priv,
	&ab3100_get_set_reg_fops);
	if (!ab3100_set_reg_file) {
	err = -ENOMEM;
	goto exit_destroy_get_reg;
	}
	return;

	exit_destroy_get_reg:
	debugfs_remove(ab3100_get_reg_file);
	exit_destroy_reg:
	debugfs_remove(ab3100_reg_file);
	exit_destroy_dir:
	debugfs_remove(ab3100_dir);
	exit_no_debugfs:
	return;
	}
	static inline void ab3100_remove_debugfs(void)
	{
	debugfs_remove(ab3100_set_reg_file);
	debugfs_remove(ab3100_get_reg_file);
	debugfs_remove(ab3100_reg_file);
	debugfs_remove(ab3100_dir);
	}
	#else
	static inline void ab3100_setup_debugfs(struct ab3100 *ab3100)
	{
	}
	static inline void ab3100_remove_debugfs(void)
	{
	}
	#endif

	/*
	* Basic set-up, datastructure creation/destruction and I2C interface.
	* This sets up a default config in the AB3100 chip so that it
	* will work as expected.
	*/

	struct ab3100_init_setting {
	u8 abreg;
	u8 setting;
	};

	static const struct ab3100_init_setting ab3100_init_settings[] = {
	{
	.abreg = AB3100_MCA,
	.setting = 0x01
	}, {
	.abreg = AB3100_MCB,
	.setting = 0x30
	}, {
	.abreg = AB3100_IMRA1,
	.setting = 0x00
	}, {
	.abreg = AB3100_IMRA2,
	.setting = 0xFF
	}, {
	.abreg = AB3100_IMRA3,
	.setting = 0x01
	}, {
	.abreg = AB3100_IMRB1,
	.setting = 0xBF
	}, {
	.abreg = AB3100_IMRB2,
	.setting = 0xFF
	}, {
	.abreg = AB3100_IMRB3,
	.setting = 0xFF
	}, {
	.abreg = AB3100_SUP,
	.setting = 0x00
	}, {
	.abreg = AB3100_DIS,
	.setting = 0xF0
	}, {
	.abreg = AB3100_D0C,
	.setting = 0x00
	}, {
	.abreg = AB3100_D1C,
	.setting = 0x00
	}, {
	.abreg = AB3100_D2C,
	.setting = 0x00
	}, {
	.abreg = AB3100_D3C,
	.setting = 0x00
	},
	};

	static int ab3100_setup(struct ab3100 *ab3100)
	{
	int err = 0;
	int i;

	for (i = 0; i < ARRAY_SIZE(ab3100_init_settings); i++) {
	err = ab3100_set_register_interruptible(ab3100,
	ab3100_init_settings[i].abreg,
	ab3100_init_settings[i].setting);
	if (err)
	goto exit_no_setup;
	}

	/*
	* Special trick to make the AB3100 use the 32kHz clock (RTC)
	* bit 3 in test register 0x02 is a special, undocumented test
	* register bit that only exist in AB3100 P1E
	*/
	if (ab3100->chip_id == 0xc4) {
	dev_warn(ab3100->dev,
	"AB3100 P1E variant detected, "
	"forcing chip to 32KHz\n");
	err = ab3100_set_test_register_interruptible(ab3100,
	0x02, 0x08);
	}

	exit_no_setup:
	return err;
	}

	/* The subdevices of the AB3100 */
	static struct mfd_cell ab3100_devs[] = {
	{
	.name = "ab3100-dac",
	.id = -1,
	},
	{
	.name = "ab3100-leds",
	.id = -1,
	},
	{
	.name = "ab3100-power",
	.id = -1,
	},
	{
	.name = "ab3100-regulators",
	.of_compatible = "stericsson,ab3100-regulators",
	.id = -1,
	},
	{
	.name = "ab3100-sim",
	.id = -1,
	},
	{
	.name = "ab3100-uart",
	.id = -1,
	},
	{
	.name = "ab3100-rtc",
	.id = -1,
	},
	{
	.name = "ab3100-charger",
	.id = -1,
	},
	{
	.name = "ab3100-boost",
	.id = -1,
	},
	{
	.name = "ab3100-adc",
	.id = -1,
	},
	{
	.name = "ab3100-fuelgauge",
	.id = -1,
	},
	{
	.name = "ab3100-vibrator",
	.id = -1,
	},
	{
	.name = "ab3100-otp",
	.id = -1,
	},
	{
	.name = "ab3100-codec",
	.id = -1,
	},
	};

	struct ab_family_id {
	u8 id;
	char *name;
	};

	static const struct ab_family_id ids[] = {
	/* AB3100 */
	{
	.id = 0xc0,
	.name = "P1A"
	}, {
	.id = 0xc1,
	.name = "P1B"
	}, {
	.id = 0xc2,
	.name = "P1C"
	}, {
	.id = 0xc3,
	.name = "P1D"
	}, {
	.id = 0xc4,
	.name = "P1E"
	}, {
	.id = 0xc5,
	.name = "P1F/R1A"
	}, {
	.id = 0xc6,
	.name = "P1G/R1A"
	}, {
	.id = 0xc7,
	.name = "P2A/R2A"
	}, {
	.id = 0xc8,
	.name = "P2B/R2B"
	},
	/* AB3000 variants, not supported */
	{
	.id = 0xa0
	}, {
	.id = 0xa1
	}, {
	.id = 0xa2
	}, {
	.id = 0xa3
	}, {
	.id = 0xa4
	}, {
	.id = 0xa5
	}, {
	.id = 0xa6
	}, {
	.id = 0xa7
	},
	/* Terminator */
	{
	.id = 0x00,
	},
	};

	static int ab3100_probe(struct i2c_client *client,
	const struct i2c_device_id *id)
	{
	struct ab3100 *ab3100;
	struct ab3100_platform_data *ab3100_plf_data =
	dev_get_platdata(&client->dev);
	int err;
	int i;

	ab3100 = devm_kzalloc(&client->dev, sizeof(struct ab3100), GFP_KERNEL);
	if (!ab3100) {
	dev_err(&client->dev, "could not allocate AB3100 device\n");
	return -ENOMEM;
	}

	/* Initialize data structure */
	mutex_init(&ab3100->access_mutex);
	BLOCKING_INIT_NOTIFIER_HEAD(&ab3100->event_subscribers);

	ab3100->i2c_client = client;
	ab3100->dev = &ab3100->i2c_client->dev;

	i2c_set_clientdata(client, ab3100);

	/* Read chip ID register */
	err = ab3100_get_register_interruptible(ab3100, AB3100_CID,
	&ab3100->chip_id);
	if (err) {
	dev_err(&client->dev,
	"could not communicate with the AB3100 analog "
	"baseband chip\n");
	goto exit_no_detect;
	}

	for (i = 0; ids[i].id != 0x0; i++) {
	if (ids[i].id == ab3100->chip_id) {
	if (ids[i].name != NULL) {
	snprintf(&ab3100->chip_name[0],
	sizeof(ab3100->chip_name) - 1,
	"AB3100 %s",
	ids[i].name);
	break;
	} else {
	dev_err(&client->dev,
	"AB3000 is not supported\n");
	goto exit_no_detect;
	}
	}
	}

	if (ids[i].id == 0x0) {
	dev_err(&client->dev, "unknown analog baseband chip id: 0x%x\n",
	ab3100->chip_id);
	dev_err(&client->dev, "accepting it anyway. Please update "
	"the driver.\n");
	goto exit_no_detect;
	}

	dev_info(&client->dev, "Detected chip: %s\n",
	&ab3100->chip_name[0]);

	/* Attach a second dummy i2c_client to the test register address */
	ab3100->testreg_client = i2c_new_dummy(client->adapter,
	client->addr + 1);
	if (!ab3100->testreg_client) {
	err = -ENOMEM;
	goto exit_no_testreg_client;
	}

	err = ab3100_setup(ab3100);
	if (err)
	goto exit_no_setup;

	err = devm_request_threaded_irq(&client->dev,
	client->irq, NULL, ab3100_irq_handler,
	IRQF_ONESHOT, "ab3100-core", ab3100);
	if (err)
	goto exit_no_irq;

	err = abx500_register_ops(&client->dev, &ab3100_ops);
	if (err)
	goto exit_no_ops;

	/* Set up and register the platform devices. */
	for (i = 0; i < ARRAY_SIZE(ab3100_devs); i++) {
	ab3100_devs[i].platform_data = ab3100_plf_data;
	ab3100_devs[i].pdata_size = sizeof(struct ab3100_platform_data);
	}

	err = mfd_add_devices(&client->dev, 0, ab3100_devs,
	ARRAY_SIZE(ab3100_devs), NULL, 0, NULL);

	ab3100_setup_debugfs(ab3100);

	return 0;

	exit_no_ops:
	exit_no_irq:
	exit_no_setup:
	i2c_unregister_device(ab3100->testreg_client);
	exit_no_testreg_client:
	exit_no_detect:
	return err;
	}

	static int ab3100_remove(struct i2c_client *client)
	{
	struct ab3100 *ab3100 = i2c_get_clientdata(client);

	/* Unregister subdevices */
	mfd_remove_devices(&client->dev);
	ab3100_remove_debugfs();
	i2c_unregister_device(ab3100->testreg_client);
	return 0;
	}

	static const struct i2c_device_id ab3100_id[] = {
	{ "ab3100", 0 },
	{ }
	};
	MODULE_DEVICE_TABLE(i2c, ab3100_id);

	static struct i2c_driver ab3100_driver = {
	.driver = {
	.name = "ab3100",
	.owner = THIS_MODULE,
	},
	.id_table = ab3100_id,
	.probe = ab3100_probe,
	.remove = ab3100_remove,
	};

	static int __init ab3100_i2c_init(void)
	{
	return i2c_add_driver(&ab3100_driver);
	}

	static void __exit ab3100_i2c_exit(void)
	{
	i2c_del_driver(&ab3100_driver);
	}

	subsys_initcall(ab3100_i2c_init);
	module_exit(ab3100_i2c_exit);

	MODULE_AUTHOR("Linus Walleij <linus.walleij@stericsson.com>");
	MODULE_DESCRIPTION("AB3100 core driver");
	MODULE_LICENSE("GPL");