/*
   * tps65010 - driver for tps6501x power management chips
   *
   * Copyright (C) 2004 Texas Instruments
   * Copyright (C) 2004-2005 David Brownell
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License as published by
   * the Free Software Foundation; either version 2 of the License, or
   * (at your option) any later version.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, write to the Free Software
   * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
   */

  #include <linux/kernel.h>
  #include <linux/module.h>
  #include <linux/init.h>
  #include <linux/slab.h>
  #include <linux/interrupt.h>

  #include <linux/i2c.h>
  #include <linux/delay.h>
  #include <linux/workqueue.h>

  #include <linux/debugfs.h>
  #include <linux/seq_file.h>

  #include <linux/mutex.h>

  #include <linux/platform_device.h>

  #include <linux/i2c/tps65010.h>

  #include <linux/gpio.h>

  /*-------------------------------------------------------------------------*/
  
  #define	DRIVER_VERSION	"2 May 2005"

  #define	DRIVER_NAME	(tps65010_driver.driver.name)

  
  MODULE_DESCRIPTION("TPS6501x Power Management Driver");
  MODULE_LICENSE("GPL");

  static struct i2c_driver tps65010_driver;
  
  /*-------------------------------------------------------------------------*/
  
  /* This driver handles a family of multipurpose chips, which incorporate
   * voltage regulators, lithium ion/polymer battery charging, GPIOs, LEDs,
   * and other features often needed in portable devices like cell phones
   * or digital cameras.
   *
   * The tps65011 and tps65013 have different voltage settings compared
   * to tps65010 and tps65012.  The tps65013 has a NO_CHG status/irq.
   * All except tps65010 have "wait" mode, possibly defaulted so that
   * battery-insert != device-on.
   *
   * We could distinguish between some models by checking VDCDC1.UVLO or
   * other registers, unless they've been changed already after powerup
   * as part of board setup by a bootloader.
   */
  enum tps_model {

  	TPS65010,
  	TPS65011,
  	TPS65012,
  	TPS65013,
  };
  
  struct tps65010 {

  	struct i2c_client	*client;

  	struct mutex		lock;

  	struct delayed_work	work;

  	struct dentry		*file;
  	unsigned		charging:1;
  	unsigned		por:1;
  	unsigned		model:8;
  	u16			vbus;
  	unsigned long		flags;
  #define	FLAG_VBUS_CHANGED	0
  #define	FLAG_IRQ_ENABLE		1
  
  	/* copies of last register state */
  	u8			chgstatus, regstatus, chgconf;
  	u8			nmask1, nmask2;

  	u8			outmask;
  	struct gpio_chip	chip;
  	struct platform_device	*leds;

  };

  #define	POWER_POLL_DELAY	msecs_to_jiffies(5000)

  
  /*-------------------------------------------------------------------------*/
  
  #if	defined(DEBUG) || defined(CONFIG_DEBUG_FS)
  
  static void dbg_chgstat(char *buf, size_t len, u8 chgstatus)
  {
  	snprintf(buf, len, "%02x%s%s%s%s%s%s%s%s
  ",
  		chgstatus,
  		(chgstatus & TPS_CHG_USB) ? " USB" : "",
  		(chgstatus & TPS_CHG_AC) ? " AC" : "",
  		(chgstatus & TPS_CHG_THERM) ? " therm" : "",
  		(chgstatus & TPS_CHG_TERM) ? " done" :
  			((chgstatus & (TPS_CHG_USB|TPS_CHG_AC))
  				? " (charging)" : ""),
  		(chgstatus & TPS_CHG_TAPER_TMO) ? " taper_tmo" : "",
  		(chgstatus & TPS_CHG_CHG_TMO) ? " charge_tmo" : "",
  		(chgstatus & TPS_CHG_PRECHG_TMO) ? " prechg_tmo" : "",
  		(chgstatus & TPS_CHG_TEMP_ERR) ? " temp_err" : "");
  }
  
  static void dbg_regstat(char *buf, size_t len, u8 regstatus)
  {
  	snprintf(buf, len, "%02x %s%s%s%s%s%s%s%s
  ",
  		regstatus,
  		(regstatus & TPS_REG_ONOFF) ? "off" : "(on)",
  		(regstatus & TPS_REG_COVER) ? " uncover" : "",
  		(regstatus & TPS_REG_UVLO) ? " UVLO" : "",
  		(regstatus & TPS_REG_NO_CHG) ? " NO_CHG" : "",

  		(regstatus & TPS_REG_PG_LD02) ? " ld02_bad" : "",

  		(regstatus & TPS_REG_PG_LD01) ? " ld01_bad" : "",
  		(regstatus & TPS_REG_PG_MAIN) ? " main_bad" : "",
  		(regstatus & TPS_REG_PG_CORE) ? " core_bad" : "");
  }
  
  static void dbg_chgconf(int por, char *buf, size_t len, u8 chgconfig)
  {

  	const char *hibit;

  
  	if (por)
  		hibit = (chgconfig & TPS_CHARGE_POR)
  				? "POR=69ms" : "POR=1sec";
  	else
  		hibit = (chgconfig & TPS65013_AUA) ? "AUA" : "";
  
  	snprintf(buf, len, "%02x %s%s%s AC=%d%% USB=%dmA %sCharge
  ",
  		chgconfig, hibit,
  		(chgconfig & TPS_CHARGE_RESET) ? " reset" : "",
  		(chgconfig & TPS_CHARGE_FAST) ? " fast" : "",
  		({int p; switch ((chgconfig >> 3) & 3) {
  		case 3:		p = 100; break;
  		case 2:		p = 75; break;
  		case 1:		p = 50; break;
  		default:	p = 25; break;
  		}; p; }),
  		(chgconfig & TPS_VBUS_CHARGING)
  			? ((chgconfig & TPS_VBUS_500MA) ? 500 : 100)
  			: 0,
  		(chgconfig & TPS_CHARGE_ENABLE) ? "" : "No");
  }
  
  #endif
  
  #ifdef	DEBUG
  
  static void show_chgstatus(const char *label, u8 chgstatus)
  {
  	char buf [100];
  
  	dbg_chgstat(buf, sizeof buf, chgstatus);
  	pr_debug("%s: %s %s", DRIVER_NAME, label, buf);
  }
  
  static void show_regstatus(const char *label, u8 regstatus)
  {
  	char buf [100];
  
  	dbg_regstat(buf, sizeof buf, regstatus);
  	pr_debug("%s: %s %s", DRIVER_NAME, label, buf);
  }
  
  static void show_chgconfig(int por, const char *label, u8 chgconfig)
  {
  	char buf [100];
  
  	dbg_chgconf(por, buf, sizeof buf, chgconfig);
  	pr_debug("%s: %s %s", DRIVER_NAME, label, buf);
  }
  
  #else
  
  static inline void show_chgstatus(const char *label, u8 chgstatus) { }
  static inline void show_regstatus(const char *label, u8 chgstatus) { }
  static inline void show_chgconfig(int por, const char *label, u8 chgconfig) { }
  
  #endif
  
  #ifdef	CONFIG_DEBUG_FS
  
  static int dbg_show(struct seq_file *s, void *_)
  {
  	struct tps65010	*tps = s->private;
  	u8		value, v2;
  	unsigned	i;
  	char		buf[100];
  	const char	*chip;
  
  	switch (tps->model) {
  	case TPS65010:	chip = "tps65010"; break;
  	case TPS65011:	chip = "tps65011"; break;
  	case TPS65012:	chip = "tps65012"; break;
  	case TPS65013:	chip = "tps65013"; break;
  	default:	chip = NULL; break;
  	}
  	seq_printf(s, "driver  %s
  version %s
  chip    %s
  
  ",
  			DRIVER_NAME, DRIVER_VERSION, chip);

  	mutex_lock(&tps->lock);

  
  	/* FIXME how can we tell whether a battery is present?
  	 * likely involves a charge gauging chip (like BQ26501).
  	 */
  
  	seq_printf(s, "%scharging
  
  ", tps->charging ? "" : "(not) ");
  
  
  	/* registers for monitoring battery charging and status; note
  	 * that reading chgstat and regstat may ack IRQs...
  	 */

  	value = i2c_smbus_read_byte_data(tps->client, TPS_CHGCONFIG);

  	dbg_chgconf(tps->por, buf, sizeof buf, value);
  	seq_printf(s, "chgconfig %s", buf);

  	value = i2c_smbus_read_byte_data(tps->client, TPS_CHGSTATUS);

  	dbg_chgstat(buf, sizeof buf, value);
  	seq_printf(s, "chgstat   %s", buf);

  	value = i2c_smbus_read_byte_data(tps->client, TPS_MASK1);

  	dbg_chgstat(buf, sizeof buf, value);
  	seq_printf(s, "mask1     %s", buf);
  	/* ignore ackint1 */

  	value = i2c_smbus_read_byte_data(tps->client, TPS_REGSTATUS);

  	dbg_regstat(buf, sizeof buf, value);
  	seq_printf(s, "regstat   %s", buf);

  	value = i2c_smbus_read_byte_data(tps->client, TPS_MASK2);

  	dbg_regstat(buf, sizeof buf, value);
  	seq_printf(s, "mask2     %s
  ", buf);
  	/* ignore ackint2 */

  	schedule_delayed_work(&tps->work, POWER_POLL_DELAY);

  
  
  	/* VMAIN voltage, enable lowpower, etc */

  	value = i2c_smbus_read_byte_data(tps->client, TPS_VDCDC1);

  	seq_printf(s, "vdcdc1    %02x
  ", value);
  
  	/* VCORE voltage, vibrator on/off */

  	value = i2c_smbus_read_byte_data(tps->client, TPS_VDCDC2);

  	seq_printf(s, "vdcdc2    %02x
  ", value);
  
  	/* both LD0s, and their lowpower behavior */

  	value = i2c_smbus_read_byte_data(tps->client, TPS_VREGS1);

  	seq_printf(s, "vregs1    %02x
  
  ", value);
  
  
  	/* LEDs and GPIOs */

  	value = i2c_smbus_read_byte_data(tps->client, TPS_LED1_ON);
  	v2 = i2c_smbus_read_byte_data(tps->client, TPS_LED1_PER);

  	seq_printf(s, "led1 %s, on=%02x, per=%02x, %d/%d msec
  ",
  		(value & 0x80)
  			? ((v2 & 0x80) ? "on" : "off")
  			: ((v2 & 0x80) ? "blink" : "(nPG)"),
  		value, v2,
  		(value & 0x7f) * 10, (v2 & 0x7f) * 100);

  	value = i2c_smbus_read_byte_data(tps->client, TPS_LED2_ON);
  	v2 = i2c_smbus_read_byte_data(tps->client, TPS_LED2_PER);

  	seq_printf(s, "led2 %s, on=%02x, per=%02x, %d/%d msec
  ",
  		(value & 0x80)
  			? ((v2 & 0x80) ? "on" : "off")
  			: ((v2 & 0x80) ? "blink" : "off"),
  		value, v2,
  		(value & 0x7f) * 10, (v2 & 0x7f) * 100);

  	value = i2c_smbus_read_byte_data(tps->client, TPS_DEFGPIO);
  	v2 = i2c_smbus_read_byte_data(tps->client, TPS_MASK3);

  	seq_printf(s, "defgpio %02x mask3 %02x
  ", value, v2);
  
  	for (i = 0; i < 4; i++) {

  		if (value & (1 << (4 + i)))

  			seq_printf(s, "  gpio%d-out %s
  ", i + 1,
  				(value & (1 << i)) ? "low" : "hi ");
  		else
  			seq_printf(s, "  gpio%d-in  %s %s %s
  ", i + 1,
  				(value & (1 << i)) ? "hi " : "low",
  				(v2 & (1 << i)) ? "no-irq" : "irq",
  				(v2 & (1 << (4 + i))) ? "rising" : "falling");
  	}

  	mutex_unlock(&tps->lock);

  	return 0;
  }
  
  static int dbg_tps_open(struct inode *inode, struct file *file)
  {

  	return single_open(file, dbg_show, inode->i_private);

  }

  static const struct file_operations debug_fops = {

  	.open		= dbg_tps_open,
  	.read		= seq_read,
  	.llseek		= seq_lseek,
  	.release	= single_release,
  };
  
  #define	DEBUG_FOPS	&debug_fops
  
  #else
  #define	DEBUG_FOPS	NULL
  #endif
  
  /*-------------------------------------------------------------------------*/
  
  /* handle IRQS in a task context, so we can use I2C calls */
  static void tps65010_interrupt(struct tps65010 *tps)
  {
  	u8 tmp = 0, mask, poll;

  	/* IRQs won't trigger for certain events, but we can get

  	 * others by polling (normally, with external power applied).
  	 */
  	poll = 0;
  
  	/* regstatus irqs */
  	if (tps->nmask2) {

  		tmp = i2c_smbus_read_byte_data(tps->client, TPS_REGSTATUS);

  		mask = tmp ^ tps->regstatus;
  		tps->regstatus = tmp;
  		mask &= tps->nmask2;
  	} else
  		mask = 0;
  	if (mask) {
  		tps->regstatus =  tmp;
  		/* may need to shut something down ... */
  
  		/* "off" usually means deep sleep */
  		if (tmp & TPS_REG_ONOFF) {
  			pr_info("%s: power off button
  ", DRIVER_NAME);
  #if 0
  			/* REVISIT:  this might need its own workqueue
  			 * plus tweaks including deadlock avoidance ...

  			 * also needs to get error handling and probably

  			 * an #ifdef CONFIG_HIBERNATION

  			 */

  			hibernate();

  #endif
  			poll = 1;
  		}
  	}
  
  	/* chgstatus irqs */
  	if (tps->nmask1) {

  		tmp = i2c_smbus_read_byte_data(tps->client, TPS_CHGSTATUS);

  		mask = tmp ^ tps->chgstatus;
  		tps->chgstatus = tmp;
  		mask &= tps->nmask1;
  	} else
  		mask = 0;
  	if (mask) {
  		unsigned	charging = 0;
  
  		show_chgstatus("chg/irq", tmp);
  		if (tmp & (TPS_CHG_USB|TPS_CHG_AC))
  			show_chgconfig(tps->por, "conf", tps->chgconf);
  
  		/* Unless it was turned off or disabled, we charge any
  		 * battery whenever there's power available for it
  		 * and the charger hasn't been disabled.
  		 */
  		if (!(tps->chgstatus & ~(TPS_CHG_USB|TPS_CHG_AC))
  				&& (tps->chgstatus & (TPS_CHG_USB|TPS_CHG_AC))
  				&& (tps->chgconf & TPS_CHARGE_ENABLE)
  				) {
  			if (tps->chgstatus & TPS_CHG_USB) {
  				/* VBUS options are readonly until reconnect */
  				if (mask & TPS_CHG_USB)
  					set_bit(FLAG_VBUS_CHANGED, &tps->flags);
  				charging = 1;
  			} else if (tps->chgstatus & TPS_CHG_AC)
  				charging = 1;
  		}
  		if (charging != tps->charging) {
  			tps->charging = charging;
  			pr_info("%s: battery %scharging
  ",
  				DRIVER_NAME, charging ? "" :
  				((tps->chgstatus & (TPS_CHG_USB|TPS_CHG_AC))
  					? "NOT " : "dis"));
  		}
  	}
  
  	/* always poll to detect (a) power removal, without tps65013
  	 * NO_CHG IRQ; or (b) restart of charging after stop.
  	 */
  	if ((tps->model != TPS65013 || !tps->charging)
  			&& (tps->chgstatus & (TPS_CHG_USB|TPS_CHG_AC)))
  		poll = 1;
  	if (poll)

  		schedule_delayed_work(&tps->work, POWER_POLL_DELAY);

  
  	/* also potentially gpio-in rise or fall */
  }
  
  /* handle IRQs and polling using keventd for now */

  static void tps65010_work(struct work_struct *work)

  {

  	struct tps65010		*tps;

  	tps = container_of(to_delayed_work(work), struct tps65010, work);

  	mutex_lock(&tps->lock);

  
  	tps65010_interrupt(tps);
  
  	if (test_and_clear_bit(FLAG_VBUS_CHANGED, &tps->flags)) {
  		int	status;
  		u8	chgconfig, tmp;

  		chgconfig = i2c_smbus_read_byte_data(tps->client,

  					TPS_CHGCONFIG);
  		chgconfig &= ~(TPS_VBUS_500MA | TPS_VBUS_CHARGING);
  		if (tps->vbus == 500)
  			chgconfig |= TPS_VBUS_500MA | TPS_VBUS_CHARGING;
  		else if (tps->vbus >= 100)
  			chgconfig |= TPS_VBUS_CHARGING;

  		status = i2c_smbus_write_byte_data(tps->client,

  				TPS_CHGCONFIG, chgconfig);
  
  		/* vbus update fails unless VBUS is connected! */

  		tmp = i2c_smbus_read_byte_data(tps->client, TPS_CHGCONFIG);

  		tps->chgconf = tmp;
  		show_chgconfig(tps->por, "update vbus", tmp);
  	}
  
  	if (test_and_clear_bit(FLAG_IRQ_ENABLE, &tps->flags))

  		enable_irq(tps->client->irq);

  	mutex_unlock(&tps->lock);

  }

  static irqreturn_t tps65010_irq(int irq, void *_tps)

  {
  	struct tps65010		*tps = _tps;
  
  	disable_irq_nosync(irq);
  	set_bit(FLAG_IRQ_ENABLE, &tps->flags);

  	schedule_delayed_work(&tps->work, 0);

  	return IRQ_HANDLED;
  }
  
  /*-------------------------------------------------------------------------*/

  /* offsets 0..3 == GPIO1..GPIO4
   * offsets 4..5 == LED1/nPG, LED2 (we set one of the non-BLINK modes)

   * offset 6 == vibrator motor driver

   */
  static void
  tps65010_gpio_set(struct gpio_chip *chip, unsigned offset, int value)
  {
  	if (offset < 4)
  		tps65010_set_gpio_out_value(offset + 1, value);

  	else if (offset < 6)

  		tps65010_set_led(offset - 3, value ? ON : OFF);

  	else
  		tps65010_set_vib(value);

  }
  
  static int
  tps65010_output(struct gpio_chip *chip, unsigned offset, int value)
  {
  	/* GPIOs may be input-only */
  	if (offset < 4) {
  		struct tps65010		*tps;
  
  		tps = container_of(chip, struct tps65010, chip);
  		if (!(tps->outmask & (1 << offset)))
  			return -EINVAL;
  		tps65010_set_gpio_out_value(offset + 1, value);

  	} else if (offset < 6)

  		tps65010_set_led(offset - 3, value ? ON : OFF);

  	else
  		tps65010_set_vib(value);

  
  	return 0;
  }
  
  static int tps65010_gpio_get(struct gpio_chip *chip, unsigned offset)
  {
  	int			value;
  	struct tps65010		*tps;
  
  	tps = container_of(chip, struct tps65010, chip);
  
  	if (offset < 4) {
  		value = i2c_smbus_read_byte_data(tps->client, TPS_DEFGPIO);
  		if (value < 0)
  			return 0;
  		if (value & (1 << (offset + 4)))	/* output */
  			return !(value & (1 << offset));
  		else					/* input */
  			return (value & (1 << offset));
  	}
  
  	/* REVISIT we *could* report LED1/nPG and LED2 state ... */
  	return 0;
  }
  
  
  /*-------------------------------------------------------------------------*/

  static struct tps65010 *the_tps;

  static int __exit tps65010_remove(struct i2c_client *client)

  {

  	struct tps65010		*tps = i2c_get_clientdata(client);

  	struct tps65010_board	*board = client->dev.platform_data;

  	if (board && board->teardown) {
  		int status = board->teardown(client, board->context);
  		if (status < 0)
  			dev_dbg(&client->dev, "board %s %s err %d
  ",
  				"teardown", client->name, status);
  	}

  	if (client->irq > 0)
  		free_irq(client->irq, tps);

  	cancel_delayed_work_sync(&tps->work);

  	debugfs_remove(tps->file);

  	kfree(tps);

  	the_tps = NULL;

  	return 0;
  }

  static int tps65010_probe(struct i2c_client *client,
  			  const struct i2c_device_id *id)

  {
  	struct tps65010		*tps;
  	int			status;

  	struct tps65010_board	*board = client->dev.platform_data;

  
  	if (the_tps) {

  		dev_dbg(&client->dev, "only one tps6501x chip allowed
  ");
  		return -ENODEV;

  	}

  	if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
  		return -EINVAL;

  	tps = kzalloc(sizeof *tps, GFP_KERNEL);

  	if (!tps)

  		return -ENOMEM;

  	mutex_init(&tps->lock);

  	INIT_DELAYED_WORK(&tps->work, tps65010_work);

  	tps->client = client;

  	tps->model = id->driver_data;

  	/* the IRQ is active low, but many gpio lines can't support that
  	 * so this driver uses falling-edge triggers instead.
  	 */
  	if (client->irq > 0) {
  		status = request_irq(client->irq, tps65010_irq,
  			IRQF_SAMPLE_RANDOM | IRQF_TRIGGER_FALLING,
  			DRIVER_NAME, tps);

  		if (status < 0) {

  			dev_dbg(&client->dev, "can't get IRQ %d, err %d
  ",

  					client->irq, status);

  			goto fail1;
  		}

  		/* annoying race here, ideally we'd have an option
  		 * to claim the irq now and enable it later.

  		 * FIXME genirq IRQF_NOAUTOEN now solves that ...

  		 */

  		disable_irq(client->irq);

  		set_bit(FLAG_IRQ_ENABLE, &tps->flags);

  	} else

  		dev_warn(&client->dev, "IRQ not configured!
  ");

  
  
  	switch (tps->model) {
  	case TPS65010:
  	case TPS65012:
  		tps->por = 1;
  		break;

  	/* else CHGCONFIG.POR is replaced by AUA, enabling a WAIT mode */
  	}

  	tps->chgconf = i2c_smbus_read_byte_data(client, TPS_CHGCONFIG);

  	show_chgconfig(tps->por, "conf/init", tps->chgconf);
  
  	show_chgstatus("chg/init",

  		i2c_smbus_read_byte_data(client, TPS_CHGSTATUS));

  	show_regstatus("reg/init",

  		i2c_smbus_read_byte_data(client, TPS_REGSTATUS));

  
  	pr_debug("%s: vdcdc1 0x%02x, vdcdc2 %02x, vregs1 %02x
  ", DRIVER_NAME,

  		i2c_smbus_read_byte_data(client, TPS_VDCDC1),
  		i2c_smbus_read_byte_data(client, TPS_VDCDC2),
  		i2c_smbus_read_byte_data(client, TPS_VREGS1));

  	pr_debug("%s: defgpio 0x%02x, mask3 0x%02x
  ", DRIVER_NAME,

  		i2c_smbus_read_byte_data(client, TPS_DEFGPIO),
  		i2c_smbus_read_byte_data(client, TPS_MASK3));

  	i2c_set_clientdata(client, tps);

  	the_tps = tps;
  
  #if	defined(CONFIG_USB_GADGET) && !defined(CONFIG_USB_OTG)
  	/* USB hosts can't draw VBUS.  OTG devices could, later
  	 * when OTG infrastructure enables it.  USB peripherals
  	 * could be relying on VBUS while booting, though.
  	 */
  	tps->vbus = 100;
  #endif
  
  	/* unmask the "interesting" irqs, then poll once to
  	 * kickstart monitoring, initialize shadowed status
  	 * registers, and maybe disable VBUS draw.
  	 */
  	tps->nmask1 = ~0;

  	(void) i2c_smbus_write_byte_data(client, TPS_MASK1, ~tps->nmask1);

  
  	tps->nmask2 = TPS_REG_ONOFF;
  	if (tps->model == TPS65013)
  		tps->nmask2 |= TPS_REG_NO_CHG;

  	(void) i2c_smbus_write_byte_data(client, TPS_MASK2, ~tps->nmask2);

  	(void) i2c_smbus_write_byte_data(client, TPS_MASK3, 0x0f
  		| i2c_smbus_read_byte_data(client, TPS_MASK3));

  	tps65010_work(&tps->work.work);

  
  	tps->file = debugfs_create_file(DRIVER_NAME, S_IRUGO, NULL,
  				tps, DEBUG_FOPS);

  
  	/* optionally register GPIOs */

  	if (board && board->base != 0) {

  		tps->outmask = board->outmask;
  
  		tps->chip.label = client->name;

  		tps->chip.dev = &client->dev;
  		tps->chip.owner = THIS_MODULE;

  
  		tps->chip.set = tps65010_gpio_set;
  		tps->chip.direction_output = tps65010_output;
  
  		/* NOTE:  only partial support for inputs; nyet IRQs */
  		tps->chip.get = tps65010_gpio_get;
  
  		tps->chip.base = board->base;

  		tps->chip.ngpio = 7;

  		tps->chip.can_sleep = 1;
  
  		status = gpiochip_add(&tps->chip);
  		if (status < 0)
  			dev_err(&client->dev, "can't add gpiochip, err %d
  ",
  					status);
  		else if (board->setup) {
  			status = board->setup(client, board->context);
  			if (status < 0) {
  				dev_dbg(&client->dev,
  					"board %s %s err %d
  ",
  					"setup", client->name, status);
  				status = 0;
  			}
  		}
  	}

  	return 0;

  fail1:
  	kfree(tps);

  	return status;

  }

  static const struct i2c_device_id tps65010_id[] = {
  	{ "tps65010", TPS65010 },
  	{ "tps65011", TPS65011 },
  	{ "tps65012", TPS65012 },
  	{ "tps65013", TPS65013 },

  	{ "tps65014", TPS65011 },	/* tps65011 charging at 6.5V max */

  	{ }
  };
  MODULE_DEVICE_TABLE(i2c, tps65010_id);

  static struct i2c_driver tps65010_driver = {

  	.driver = {

  		.name	= "tps65010",
  	},

  	.probe	= tps65010_probe,
  	.remove	= __exit_p(tps65010_remove),

  	.id_table = tps65010_id,

  };
  
  /*-------------------------------------------------------------------------*/
  
  /* Draw from VBUS:
   *   0 mA -- DON'T DRAW (might supply power instead)
   * 100 mA -- usb unit load (slowest charge rate)
   * 500 mA -- usb high power (fast battery charge)
   */
  int tps65010_set_vbus_draw(unsigned mA)
  {
  	unsigned long	flags;
  
  	if (!the_tps)
  		return -ENODEV;
  
  	/* assumes non-SMP */
  	local_irq_save(flags);
  	if (mA >= 500)
  		mA = 500;
  	else if (mA >= 100)
  		mA = 100;
  	else
  		mA = 0;
  	the_tps->vbus = mA;
  	if ((the_tps->chgstatus & TPS_CHG_USB)
  			&& test_and_set_bit(
  				FLAG_VBUS_CHANGED, &the_tps->flags)) {
  		/* gadget drivers call this in_irq() */

  		schedule_delayed_work(&the_tps->work, 0);

  	}
  	local_irq_restore(flags);
  
  	return 0;
  }
  EXPORT_SYMBOL(tps65010_set_vbus_draw);
  
  /*-------------------------------------------------------------------------*/
  /* tps65010_set_gpio_out_value parameter:
   * gpio:  GPIO1, GPIO2, GPIO3 or GPIO4
   * value: LOW or HIGH
   */
  int tps65010_set_gpio_out_value(unsigned gpio, unsigned value)
  {
  	int	 status;
  	unsigned defgpio;
  
  	if (!the_tps)
  		return -ENODEV;
  	if ((gpio < GPIO1) || (gpio > GPIO4))
  		return -EINVAL;

  	mutex_lock(&the_tps->lock);

  	defgpio = i2c_smbus_read_byte_data(the_tps->client, TPS_DEFGPIO);

  
  	/* Configure GPIO for output */
  	defgpio |= 1 << (gpio + 3);
  
  	/* Writing 1 forces a logic 0 on that GPIO and vice versa */
  	switch (value) {
  	case LOW:
  		defgpio |= 1 << (gpio - 1);    /* set GPIO low by writing 1 */
  		break;
  	/* case HIGH: */
  	default:
  		defgpio &= ~(1 << (gpio - 1)); /* set GPIO high by writing 0 */
  		break;
  	}

  	status = i2c_smbus_write_byte_data(the_tps->client,

  		TPS_DEFGPIO, defgpio);
  
  	pr_debug("%s: gpio%dout = %s, defgpio 0x%02x
  ", DRIVER_NAME,
  		gpio, value ? "high" : "low",

  		i2c_smbus_read_byte_data(the_tps->client, TPS_DEFGPIO));

  	mutex_unlock(&the_tps->lock);

  	return status;
  }
  EXPORT_SYMBOL(tps65010_set_gpio_out_value);
  
  /*-------------------------------------------------------------------------*/
  /* tps65010_set_led parameter:
   * led:  LED1 or LED2
   * mode: ON, OFF or BLINK
   */
  int tps65010_set_led(unsigned led, unsigned mode)
  {
  	int	 status;
  	unsigned led_on, led_per, offs;
  
  	if (!the_tps)
  		return -ENODEV;

  	if (led == LED1)

  		offs = 0;
  	else {
  		offs = 2;
  		led = LED2;
  	}

  	mutex_lock(&the_tps->lock);

  	pr_debug("%s: led%i_on   0x%02x
  ", DRIVER_NAME, led,

  		i2c_smbus_read_byte_data(the_tps->client,

  				TPS_LED1_ON + offs));

  	pr_debug("%s: led%i_per  0x%02x
  ", DRIVER_NAME, led,

  		i2c_smbus_read_byte_data(the_tps->client,

  				TPS_LED1_PER + offs));

  
  	switch (mode) {
  	case OFF:
  		led_on  = 1 << 7;
  		led_per = 0 << 7;
  		break;
  	case ON:
  		led_on  = 1 << 7;
  		led_per = 1 << 7;
  		break;
  	case BLINK:
  		led_on  = 0x30 | (0 << 7);
  		led_per = 0x08 | (1 << 7);
  		break;
  	default:

  		printk(KERN_ERR "%s: Wrong mode parameter for set_led()
  ",

  		       DRIVER_NAME);

  		mutex_unlock(&the_tps->lock);

  		return -EINVAL;
  	}

  	status = i2c_smbus_write_byte_data(the_tps->client,

  			TPS_LED1_ON + offs, led_on);
  
  	if (status != 0) {
  		printk(KERN_ERR "%s: Failed to write led%i_on register
  ",
  		       DRIVER_NAME, led);

  		mutex_unlock(&the_tps->lock);

  		return status;
  	}

  	pr_debug("%s: led%i_on   0x%02x
  ", DRIVER_NAME, led,

  		i2c_smbus_read_byte_data(the_tps->client, TPS_LED1_ON + offs));

  	status = i2c_smbus_write_byte_data(the_tps->client,

  			TPS_LED1_PER + offs, led_per);
  
  	if (status != 0) {
  		printk(KERN_ERR "%s: Failed to write led%i_per register
  ",
  		       DRIVER_NAME, led);

  		mutex_unlock(&the_tps->lock);

  		return status;
  	}

  	pr_debug("%s: led%i_per  0x%02x
  ", DRIVER_NAME, led,

  		i2c_smbus_read_byte_data(the_tps->client,

  				TPS_LED1_PER + offs));

  	mutex_unlock(&the_tps->lock);

  
  	return status;
  }
  EXPORT_SYMBOL(tps65010_set_led);
  
  /*-------------------------------------------------------------------------*/
  /* tps65010_set_vib parameter:
   * value: ON or OFF
   */
  int tps65010_set_vib(unsigned value)
  {
  	int	 status;
  	unsigned vdcdc2;
  
  	if (!the_tps)
  		return -ENODEV;

  	mutex_lock(&the_tps->lock);

  	vdcdc2 = i2c_smbus_read_byte_data(the_tps->client, TPS_VDCDC2);

  	vdcdc2 &= ~(1 << 1);
  	if (value)
  		vdcdc2 |= (1 << 1);

  	status = i2c_smbus_write_byte_data(the_tps->client,

  		TPS_VDCDC2, vdcdc2);
  
  	pr_debug("%s: vibrator %s
  ", DRIVER_NAME, value ? "on" : "off");

  	mutex_unlock(&the_tps->lock);

  	return status;
  }
  EXPORT_SYMBOL(tps65010_set_vib);
  
  /*-------------------------------------------------------------------------*/
  /* tps65010_set_low_pwr parameter:
   * mode: ON or OFF
   */
  int tps65010_set_low_pwr(unsigned mode)
  {
  	int	 status;
  	unsigned vdcdc1;
  
  	if (!the_tps)
  		return -ENODEV;

  	mutex_lock(&the_tps->lock);

  
  	pr_debug("%s: %s low_pwr, vdcdc1 0x%02x
  ", DRIVER_NAME,
  		mode ? "enable" : "disable",

  		i2c_smbus_read_byte_data(the_tps->client, TPS_VDCDC1));

  	vdcdc1 = i2c_smbus_read_byte_data(the_tps->client, TPS_VDCDC1);

  
  	switch (mode) {
  	case OFF:
  		vdcdc1 &= ~TPS_ENABLE_LP; /* disable ENABLE_LP bit */
  		break;
  	/* case ON: */
  	default:
  		vdcdc1 |= TPS_ENABLE_LP;  /* enable ENABLE_LP bit */
  		break;
  	}

  	status = i2c_smbus_write_byte_data(the_tps->client,

  			TPS_VDCDC1, vdcdc1);
  
  	if (status != 0)
  		printk(KERN_ERR "%s: Failed to write vdcdc1 register
  ",

  			DRIVER_NAME);

  	else
  		pr_debug("%s: vdcdc1 0x%02x
  ", DRIVER_NAME,

  			i2c_smbus_read_byte_data(the_tps->client, TPS_VDCDC1));

  	mutex_unlock(&the_tps->lock);

  
  	return status;
  }
  EXPORT_SYMBOL(tps65010_set_low_pwr);
  
  /*-------------------------------------------------------------------------*/
  /* tps65010_config_vregs1 parameter:
   * value to be written to VREGS1 register
   * Note: The complete register is written, set all bits you need
   */
  int tps65010_config_vregs1(unsigned value)
  {
  	int	 status;
  
  	if (!the_tps)
  		return -ENODEV;

  	mutex_lock(&the_tps->lock);

  
  	pr_debug("%s: vregs1 0x%02x
  ", DRIVER_NAME,

  			i2c_smbus_read_byte_data(the_tps->client, TPS_VREGS1));

  	status = i2c_smbus_write_byte_data(the_tps->client,

  			TPS_VREGS1, value);
  
  	if (status != 0)
  		printk(KERN_ERR "%s: Failed to write vregs1 register
  ",

  			DRIVER_NAME);

  	else
  		pr_debug("%s: vregs1 0x%02x
  ", DRIVER_NAME,

  			i2c_smbus_read_byte_data(the_tps->client, TPS_VREGS1));

  	mutex_unlock(&the_tps->lock);

  
  	return status;
  }
  EXPORT_SYMBOL(tps65010_config_vregs1);

  int tps65010_config_vdcdc2(unsigned value)
  {
  	struct i2c_client *c;
  	int	 status;
  
  	if (!the_tps)
  		return -ENODEV;
  
  	c = the_tps->client;
  	mutex_lock(&the_tps->lock);
  
  	pr_debug("%s: vdcdc2 0x%02x
  ", DRIVER_NAME,
  		 i2c_smbus_read_byte_data(c, TPS_VDCDC2));
  
  	status = i2c_smbus_write_byte_data(c, TPS_VDCDC2, value);
  
  	if (status != 0)
  		printk(KERN_ERR "%s: Failed to write vdcdc2 register
  ",
  			DRIVER_NAME);
  	else
  		pr_debug("%s: vregs1 0x%02x
  ", DRIVER_NAME,
  			 i2c_smbus_read_byte_data(c, TPS_VDCDC2));
  
  	mutex_unlock(&the_tps->lock);
  	return status;
  }
  EXPORT_SYMBOL(tps65010_config_vdcdc2);

  /*-------------------------------------------------------------------------*/
  /* tps65013_set_low_pwr parameter:
   * mode: ON or OFF
   */
  
  /* FIXME: Assumes AC or USB power is present. Setting AUA bit is not
  	required if power supply is through a battery */
  
  int tps65013_set_low_pwr(unsigned mode)
  {
  	int	 status;
  	unsigned vdcdc1, chgconfig;
  
  	if (!the_tps || the_tps->por)
  		return -ENODEV;

  	mutex_lock(&the_tps->lock);

  
  	pr_debug("%s: %s low_pwr, chgconfig 0x%02x vdcdc1 0x%02x
  ",
  		DRIVER_NAME,
  		mode ? "enable" : "disable",

  		i2c_smbus_read_byte_data(the_tps->client, TPS_CHGCONFIG),
  		i2c_smbus_read_byte_data(the_tps->client, TPS_VDCDC1));

  	chgconfig = i2c_smbus_read_byte_data(the_tps->client, TPS_CHGCONFIG);
  	vdcdc1 = i2c_smbus_read_byte_data(the_tps->client, TPS_VDCDC1);

  
  	switch (mode) {
  	case OFF:
  		chgconfig &= ~TPS65013_AUA; /* disable AUA bit */
  		vdcdc1 &= ~TPS_ENABLE_LP; /* disable ENABLE_LP bit */
  		break;
  	/* case ON: */
  	default:
  		chgconfig |= TPS65013_AUA;  /* enable AUA bit */
  		vdcdc1 |= TPS_ENABLE_LP;  /* enable ENABLE_LP bit */
  		break;
  	}

  	status = i2c_smbus_write_byte_data(the_tps->client,

  			TPS_CHGCONFIG, chgconfig);
  	if (status != 0) {
  		printk(KERN_ERR "%s: Failed to write chconfig register
  ",
  	 DRIVER_NAME);

  		mutex_unlock(&the_tps->lock);

  		return status;
  	}

  	chgconfig = i2c_smbus_read_byte_data(the_tps->client, TPS_CHGCONFIG);

  	the_tps->chgconf = chgconfig;
  	show_chgconfig(0, "chgconf", chgconfig);

  	status = i2c_smbus_write_byte_data(the_tps->client,

  			TPS_VDCDC1, vdcdc1);
  
  	if (status != 0)
  		printk(KERN_ERR "%s: Failed to write vdcdc1 register
  ",
  	 DRIVER_NAME);
  	else
  		pr_debug("%s: vdcdc1 0x%02x
  ", DRIVER_NAME,

  			i2c_smbus_read_byte_data(the_tps->client, TPS_VDCDC1));

  	mutex_unlock(&the_tps->lock);

  
  	return status;
  }
  EXPORT_SYMBOL(tps65013_set_low_pwr);
  
  /*-------------------------------------------------------------------------*/
  
  static int __init tps_init(void)
  {
  	u32	tries = 3;
  	int	status = -ENODEV;
  
  	printk(KERN_INFO "%s: version %s
  ", DRIVER_NAME, DRIVER_VERSION);
  
  	/* some boards have startup glitches */
  	while (tries--) {
  		status = i2c_add_driver(&tps65010_driver);
  		if (the_tps)
  			break;
  		i2c_del_driver(&tps65010_driver);
  		if (!tries) {
  			printk(KERN_ERR "%s: no chip?
  ", DRIVER_NAME);
  			return -ENODEV;
  		}
  		pr_debug("%s: re-probe ...
  ", DRIVER_NAME);
  		msleep(10);
  	}

  	return status;
  }
  /* NOTE:  this MUST be initialized before the other parts of the system
   * that rely on it ... but after the i2c bus on which this relies.
   * That is, much earlier than on PC-type systems, which don't often use
   * I2C as a core system bus.
   */
  subsys_initcall(tps_init);
  
  static void __exit tps_exit(void)
  {
  	i2c_del_driver(&tps65010_driver);
  }
  module_exit(tps_exit);