mfd: move drivers/i2c/chips/tps65010.c to drivers/mfd

Move the tps65010 driver from drivers/i2c/chips to drivers/mfd
since it's more of a multi-function device than anything else,
and since Jean is trying to vanish drivers/i2c/chips ASAP.

One way to think of these chips are as the PMIC family most
used with OMAP1 generation chips.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Samuel Ortiz <sameo@openedhand.com>

1 files changed, 1072 insertions, 0 deletions

diff --git a/drivers/mfd/tps65010.c b/drivers/mfd/tps65010.c
new file mode 100644
index 000000000000..acf8b9d5f575
--- /dev/null
+++ b/drivers/mfd/tps65010.c
@@ -0,0 +1,1072 @@
+/*
+ * 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 <asm/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\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;
+}
+
+/*-------------------------------------------------------------------------*/
+
+/* 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\n",
+                                "teardown", client->name, status);
+        }
+        if (client->irq > 0)
+                free_irq(client->irq, tps);
+        cancel_delayed_work(&tps->work);
+        flush_scheduled_work();
+        debugfs_remove(tps->file);
+        kfree(tps);
+        i2c_set_clientdata(client, NULL);
+        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\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;
+        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\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;
+        /* 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));
+
+        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\n",
+                                        status);
+                else if (board->setup) {
+                        status = board->setup(client, board->context);
+                        if (status < 0) {
+                                dev_dbg(&client->dev,
+                                        "board %s %s err %d\n",
+                                        "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() */
+                (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);
+