[PATCH] I2C: add i2c driver for TPS6501x

This adds an I2C driver for the TPS6501x series of power management chips.
It's used on many OMAP based boards, and this driver has been widely used
in the Linux-OMAP trees over the last year or so.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 1072 insertions, 0 deletions

diff --git a/drivers/i2c/chips/tps65010.c b/drivers/i2c/chips/tps65010.c
new file mode 100644
index 00000000000..c0ac01b6003
--- /dev/null
+++ b/drivers/i2c/chips/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.
+ */
+#undef	DEBUG
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/device.h>
+#include <linux/i2c.h>
+#include <linux/delay.h>
+#include <linux/workqueue.h>
+#include <linux/suspend.h>
+#include <linux/debugfs.h>
+#include <linux/seq_file.h>
+
+#include <asm/irq.h>
+#include <asm/mach-types.h>
+
+#include <asm/arch/gpio.h>
+#include <asm/arch/mux.h>
+#include <asm/arch/tps65010.h>
+
+/*-------------------------------------------------------------------------*/
+
+#define	DRIVER_VERSION	"2 May 2005"
+#define	DRIVER_NAME	(tps65010_driver.name)
+
+MODULE_DESCRIPTION("TPS6501x Power Management Driver");
+MODULE_LICENSE("GPL");
+
+/* only two addresses possible */
+#define	TPS_BASE	0x48
+static unsigned short normal_i2c[] = {
+	TPS_BASE,
+	I2C_CLIENT_END };
+static unsigned short normal_i2c_range[] = { I2C_CLIENT_END };
+
+I2C_CLIENT_INSMOD;
+
+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 semaphore	lock;
+	int			irq;
+	struct work_struct	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;
+
+	/* plus four GPIOs, probably used to switch power */
+};
+
+#define	POWER_POLL_DELAY	msecs_to_jiffies(800)
+
+/*-------------------------------------------------------------------------*/
+
+#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) ? " ld01_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)
+{
+	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);
+
+	down(&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");
+	}
+
+	up(&tps->lock);
+	return 0;
+}
+
+static int dbg_tps_open(struct inode *inode, struct file *file)
+{
+	return single_open(file, dbg_show, inode->u.generic_ip);
+}
+
+static 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 irqs 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 ...
+			 */
+			software_suspend();
+#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(void *_tps)
+{
+	struct tps65010		*tps = _tps;
+
+	down(&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->irq);
+
+	up(&tps->lock);
+}
+
+static irqreturn_t tps65010_irq(int irq, void *_tps, struct pt_regs *regs)
+{
+	struct tps65010		*tps = _tps;
+
+	disable_irq_nosync(irq);
+	set_bit(FLAG_IRQ_ENABLE, &tps->flags);
+	(void) schedule_work(&tps->work);
+	return IRQ_HANDLED;
+}
+
+/*-------------------------------------------------------------------------*/
+
+static struct tps65010 *the_tps;
+
+static int __exit tps65010_detach_client(struct i2c_client *client)
+{
+	struct tps65010		*tps;
+
+	tps = container_of(client, struct tps65010, client);
+#ifdef	CONFIG_ARM
+	if (machine_is_omap_h2())
+		omap_free_gpio(58);
+	if (machine_is_omap_osk())
+		omap_free_gpio(OMAP_MPUIO(1));
+#endif
+	free_irq(tps->irq, tps);
+	debugfs_remove(tps->file);
+	if (i2c_detach_client(client) == 0)
+		kfree(tps);
+	the_tps = 0;
+	return 0;
+}
+
+static int tps65010_noscan(struct i2c_adapter *bus)
+{
+	/* pure paranoia, in case someone adds another i2c bus
+	 * after our init section's gone...
+	 */
+	return -ENODEV;
+}
+
+/* no error returns, they'd just make bus scanning stop */
+static int __init
+tps65010_probe(struct i2c_adapter *bus, int address, int kind)
+{
+	struct tps65010		*tps;
+	int			status;
+
+	if (the_tps) {
+		dev_dbg(&bus->dev, "only one %s for now\n", DRIVER_NAME);
+		return 0;
+	}
+
+	tps = kmalloc(sizeof *tps, GFP_KERNEL);
+	if (!tps)
+		return 0;
+
+	memset(tps, 0, sizeof *tps);
+	init_MUTEX(&tps->lock);
+	INIT_WORK(&tps->work, tps65010_work, tps);
+	tps->irq = -1;
+	tps->client.addr = address;
+	i2c_set_clientdata(&tps->client, tps);
+	tps->client.adapter = bus;
+	tps->client.driver = &tps65010_driver;
+	strlcpy(tps->client.name, DRIVER_NAME, I2C_NAME_SIZE);
+
+	status = i2c_attach_client(&tps->client);
+	if (status < 0) {
+		dev_dbg(&bus->dev, "can't attach %s to device %d, err %d\n",
+				DRIVER_NAME, address, status);
+fail1:
+		kfree(tps);
+		return 0;
+	}
+
+#ifdef	CONFIG_ARM
+	if (machine_is_omap_h2()) {
+		tps->model = TPS65010;
+		omap_cfg_reg(W4_GPIO58);
+		tps->irq = OMAP_GPIO_IRQ(58);
+		omap_request_gpio(58);
+		omap_set_gpio_direction(58, 1);
+		omap_set_gpio_edge_ctrl(58, OMAP_GPIO_FALLING_EDGE);
+	}
+	if (machine_is_omap_osk()) {
+		tps->model = TPS65010;
+		// omap_cfg_reg(U19_1610_MPUIO1);
+		tps->irq = OMAP_GPIO_IRQ(OMAP_MPUIO(1));
+		omap_request_gpio(OMAP_MPUIO(1));
+		omap_set_gpio_direction(OMAP_MPUIO(1), 1);
+		omap_set_gpio_edge_ctrl(OMAP_MPUIO(1), OMAP_GPIO_FALLING_EDGE);
+	}
+	if (machine_is_omap_h3()) {
+		tps->model = TPS65013;
+
+		// FIXME set up this board's IRQ ...
+	}
+#else
+#define set_irq_type(num,trigger)	do{}while(0)
+#endif
+
+	if (tps->irq > 0) {
+		set_irq_type(tps->irq, IRQT_LOW);
+		status = request_irq(tps->irq, tps65010_irq,
+			SA_SAMPLE_RANDOM, DRIVER_NAME, tps);
+		if (status < 0) {
+			dev_dbg(&tps->client.dev, "can't get IRQ %d, err %d\n",
+					tps->irq, status);
+			i2c_detach_client(&tps->client);
+			goto fail1;
+		}
+#ifdef	CONFIG_ARM
+		/* annoying race here, ideally we'd have an option
+		 * to claim the irq now and enable it later.
+		 */
+		disable_irq(tps->irq);
+		set_bit(FLAG_IRQ_ENABLE, &tps->flags);
+#endif
+	} else
+		printk(KERN_WARNING "%s: IRQ not configured!\n",
+				DRIVER_NAME);
+
+
+	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(&tps->client, TPS_CHGCONFIG);
+	show_chgconfig(tps->por, "conf/init", tps->chgconf);
+
+	show_chgstatus("chg/init",
+		i2c_smbus_read_byte_data(&tps->client, TPS_CHGSTATUS));
+	show_regstatus("reg/init",
+		i2c_smbus_read_byte_data(&tps->client, TPS_REGSTATUS));
+
+	pr_debug("%s: vdcdc1 0x%02x, vdcdc2 %02x, vregs1 %02x\n", DRIVER_NAME,
+		i2c_smbus_read_byte_data(&tps->client, TPS_VDCDC1),
+		i2c_smbus_read_byte_data(&tps->client, TPS_VDCDC2),
+		i2c_smbus_read_byte_data(&tps->client, TPS_VREGS1));
+	pr_debug("%s: defgpio 0x%02x, mask3 0x%02x\n", DRIVER_NAME,
+		i2c_smbus_read_byte_data(&tps->client, TPS_DEFGPIO),
+		i2c_smbus_read_byte_data(&tps->client, TPS_MASK3));
+
+	tps65010_driver.attach_adapter = tps65010_noscan;
+	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(&tps->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(&tps->client, TPS_MASK2, ~tps->nmask2);
+
+	(void) i2c_smbus_write_byte_data(&tps->client, TPS_MASK3, 0x0f
+		| i2c_smbus_read_byte_data(&tps->client, TPS_MASK3));
+
+	tps65010_work(tps);
+
+	tps->file = debugfs_create_file(DRIVER_NAME, S_IRUGO, NULL,
+				tps, DEBUG_FOPS);
+	return 0;
+}
+
+static int __init tps65010_scan_bus(struct i2c_adapter *bus)
+{
+	if (!i2c_check_functionality(bus, I2C_FUNC_SMBUS_BYTE_DATA))
+		return -EINVAL;
+	return i2c_probe(bus, &addr_data, tps65010_probe);
+}
+
+static struct i2c_driver tps65010_driver = {
+	.owner		= THIS_MODULE,
+	.name		= "tps65010",
+	.id		= 888,		/* FIXME assign "official" value */
+	.flags		= I2C_DF_NOTIFY,
+	.attach_adapter	= tps65010_scan_bus,
+	.detach_client	= __exit_p(tps65010_detach_client),
+};
+
+/*-------------------------------------------------------------------------*/
+
+/* 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);
+	}
+	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;
+
+	down(&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));
+
+	up(&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;
+	}
+
+	down(&the_tps->lock);
+
+	dev_dbg (&the_tps->client.dev, "led%i_on   0x%02x\n", led,
+		i2c_smbus_read_byte_data(&the_tps->client, TPS_LED1_ON + offs));
+
+	dev_dbg (&the_tps->client.dev, "led%i_per  0x%02x\n", 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 tps65010_set_led()\n",
+		       DRIVER_NAME);
+		up(&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);
+		up(&the_tps->lock);
+		return status;
+	}
+
+	dev_dbg (&the_tps->client.dev, "led%i_on   0x%02x\n", 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);
+		up(&the_tps->lock);
+		return status;
+	}
+
+	dev_dbg (&the_tps->client.dev, "led%i_per  0x%02x\n", led,
+		i2c_smbus_read_byte_data(&the_tps->client, TPS_LED1_PER + offs));
+
+	up(&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;
+
+	down(&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");
+
+	up(&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;
+
+	down(&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));
+
+	up(&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;
+
+	down(&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));
+
+	up(&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;
+
+	down(&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);
+		up(&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));
+
+	up(&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);
+	}
+
+#if defined(CONFIG_ARM)
+	if (machine_is_omap_osk()) {
+
+		// FIXME: More should be placed in the initialization code
+		//	  of the submodules (DSP, ethernet, power management,
+		//	  board-osk.c). Careful: I2C is initialized "late".
+
+		/* Let LED1 (D9) blink */
+		tps65010_set_led(LED1, BLINK);
+
+		/* Disable LED 2 (D2) */
+		tps65010_set_led(LED2, OFF);
+
+		/* Set GPIO 1 HIGH to disable VBUS power supply;
+		 * OHCI driver powers it up/down as needed.
+		 */
+		tps65010_set_gpio_out_value(GPIO1, HIGH);
+
+		/* Set GPIO 2 low to turn on LED D3 */
+		tps65010_set_gpio_out_value(GPIO2, HIGH);
+
+		/* Set GPIO 3 low to take ethernet out of reset */
+		tps65010_set_gpio_out_value(GPIO3, LOW);
+
+		/* gpio4 for VDD_DSP */
+
+		/* Enable LOW_PWR */
+		tps65010_set_low_pwr(ON);
+
+		/* Switch VLDO2 to 3.0V for AIC23 */
+		tps65010_config_vregs1(TPS_LDO2_ENABLE | TPS_VLDO2_3_0V | TPS_LDO1_ENABLE);
+
+	} else if (machine_is_omap_h2()) {
+		/* gpio3 for SD, gpio4 for VDD_DSP */
+
+		/* Enable LOW_PWR */
+		tps65010_set_low_pwr(ON);
+	} else if (machine_is_omap_h3()) {
+		/* gpio4 for SD, gpio3 for VDD_DSP */
+#ifdef CONFIG_PM
+		/* Enable LOW_PWR */
+		tps65013_set_low_pwr(ON);
+#endif
+	}
+#endif
+
+	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);
+