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tps65010.c

/*
 * 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 <asm/arch/tps65010.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 {
      TPS_UNKNOWN = 0,
      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;

      /* not currently tracking GPIO state */
};

#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\n",
            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\n",
            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\n",
            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\nversion %s\nchip    %s\n\n",
                  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\n\n", 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\n", buf);
      /* ignore ackint2 */

      (void) 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\n", value);

      /* VCORE voltage, vibrator on/off */
      value = i2c_smbus_read_byte_data(tps->client, TPS_VDCDC2);
      seq_printf(s, "vdcdc2    %02x\n", value);

      /* both LD0s, and their lowpower behavior */
      value = i2c_smbus_read_byte_data(tps->client, TPS_VREGS1);
      seq_printf(s, "vregs1    %02x\n\n", 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\n",
            (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\n",
            (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\n", value, v2);

      for (i = 0; i < 4; i++) {
            if (value & (1 << (4 + i)))
                  seq_printf(s, "  gpio%d-out %s\n", i + 1,
                        (value & (1 << i)) ? "low" : "hi ");
            else
                  seq_printf(s, "  gpio%d-in  %s %s %s\n", 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\n", 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\n",
                        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)
            (void) 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(work, struct tps65010, work.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);
      (void) schedule_work(&tps->work.work);
      return IRQ_HANDLED;
}

/*-------------------------------------------------------------------------*/

static struct tps65010 *the_tps;

static int __exit tps65010_remove(struct i2c_client *client)
{
      struct tps65010         *tps = i2c_get_clientdata(client);

      if (client->irq > 0)
            free_irq(client->irq, tps);
      cancel_delayed_work(&tps->work);
      flush_scheduled_work();
      debugfs_remove(tps->file);
      kfree(tps);
      the_tps = NULL;
      return 0;
}

static int tps65010_probe(struct i2c_client *client)
{
      struct tps65010         *tps;
      int               status;

      if (the_tps) {
            dev_dbg(&client->dev, "only one tps6501x chip allowed\n");
            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;

      if (strcmp(client->name, "tps65010") == 0)
            tps->model = TPS65010;
      else if (strcmp(client->name, "tps65011") == 0)
            tps->model = TPS65011;
      else if (strcmp(client->name, "tps65012") == 0)
            tps->model = TPS65012;
      else if (strcmp(client->name, "tps65013") == 0)
            tps->model = TPS65013;
      else {
            dev_warn(&client->dev, "unknown chip '%s'\n", client->name);
            status = -ENODEV;
            goto fail1;
      }

      /* 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\n",
                              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!\n");


      switch (tps->model) {
      case TPS65010:
      case TPS65012:
            tps->por = 1;
            break;
      case TPS_UNKNOWN:
            printk(KERN_WARNING "%s: unknown TPS chip\n", DRIVER_NAME);
            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\n", 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\n", DRIVER_NAME,
            i2c_smbus_read_byte_data(client, TPS_DEFGPIO),
            i2c_smbus_read_byte_data(client, TPS_MASK3));

      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);
      return 0;
fail1:
      kfree(tps);
      return status;
}

static struct i2c_driver tps65010_driver = {
      .driver = {
            .name = "tps65010",
      },
      .probe      = tps65010_probe,
      .remove     = __exit_p(tps65010_remove),
};

/*-------------------------------------------------------------------------*/

/* 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() */
            (void) schedule_work(&the_tps->work.work);
      }
      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\n", 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\n", DRIVER_NAME, led,
            i2c_smbus_read_byte_data(the_tps->client,
                        TPS_LED1_ON + offs));

      pr_debug("%s: led%i_per  0x%02x\n", 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()\n",
                   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\n",
                   DRIVER_NAME, led);
            mutex_unlock(&the_tps->lock);
            return status;
      }

      pr_debug("%s: led%i_on   0x%02x\n", 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\n",
                   DRIVER_NAME, led);
            mutex_unlock(&the_tps->lock);
            return status;
      }

      pr_debug("%s: led%i_per  0x%02x\n", 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\n", 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\n", 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\n",
                  DRIVER_NAME);
      else
            pr_debug("%s: vdcdc1 0x%02x\n", 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\n", 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\n",
                  DRIVER_NAME);
      else
            pr_debug("%s: vregs1 0x%02x\n", DRIVER_NAME,
                  i2c_smbus_read_byte_data(the_tps->client, TPS_VREGS1));

      mutex_unlock(&the_tps->lock);

      return status;
}
EXPORT_SYMBOL(tps65010_config_vregs1);

/*-------------------------------------------------------------------------*/
/* 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\n",
            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\n",
       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\n",
       DRIVER_NAME);
      else
            pr_debug("%s: vdcdc1 0x%02x\n", 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\n", 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?\n", DRIVER_NAME);
                  return -ENODEV;
            }
            pr_debug("%s: re-probe ...\n", 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);


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