mfd: Rename twl4030* driver files to enable re-use

The upcoming TWL6030 is companion chip for OMAP4 like the current TWL4030
for OMAP3. The common modules like RTC, Regulator creates opportunity
to re-use the most of the code from twl4030.

This patch renames few common drivers twl4030* files to twl* to enable
the code re-use.

Signed-off-by: Rajendra Nayak <rnayak@ti.com>
Signed-off-by: Balaji T K <balajitk@ti.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Acked-by: Kevin Hilman <khilman@deeprootsystems.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 929 insertions, 0 deletions

diff --git a/drivers/mfd/twl-core.c b/drivers/mfd/twl-core.c
new file mode 100644
index 00000000000..44714f5cf49
--- /dev/null
+++ b/drivers/mfd/twl-core.c
@@ -0,0 +1,929 @@
+/*
+ * twl4030_core.c - driver for TWL4030/TPS659x0 PM and audio CODEC devices
+ *
+ * Copyright (C) 2005-2006 Texas Instruments, Inc.
+ *
+ * Modifications to defer interrupt handling to a kernel thread:
+ * Copyright (C) 2006 MontaVista Software, Inc.
+ *
+ * Based on tlv320aic23.c:
+ * Copyright (c) by Kai Svahn <kai.svahn@nokia.com>
+ *
+ * Code cleanup and modifications to IRQ handler.
+ * by syed khasim <x0khasim@ti.com>
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ */
+
+#include <linux/init.h>
+#include <linux/mutex.h>
+#include <linux/platform_device.h>
+#include <linux/clk.h>
+#include <linux/err.h>
+
+#include <linux/regulator/machine.h>
+
+#include <linux/i2c.h>
+#include <linux/i2c/twl.h>
+
+#if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
+#include <plat/cpu.h>
+#endif
+
+/*
+ * The TWL4030 "Triton 2" is one of a family of a multi-function "Power
+ * Management and System Companion Device" chips originally designed for
+ * use in OMAP2 and OMAP 3 based systems.  Its control interfaces use I2C,
+ * often at around 3 Mbit/sec, including for interrupt handling.
+ *
+ * This driver core provides genirq support for the interrupts emitted,
+ * by the various modules, and exports register access primitives.
+ *
+ * FIXME this driver currently requires use of the first interrupt line
+ * (and associated registers).
+ */
+
+#define DRIVER_NAME			"twl4030"
+
+#if defined(CONFIG_TWL4030_BCI_BATTERY) || \
+	defined(CONFIG_TWL4030_BCI_BATTERY_MODULE)
+#define twl_has_bci()		true
+#else
+#define twl_has_bci()		false
+#endif
+
+#if defined(CONFIG_KEYBOARD_TWL4030) || defined(CONFIG_KEYBOARD_TWL4030_MODULE)
+#define twl_has_keypad()	true
+#else
+#define twl_has_keypad()	false
+#endif
+
+#if defined(CONFIG_GPIO_TWL4030) || defined(CONFIG_GPIO_TWL4030_MODULE)
+#define twl_has_gpio()	true
+#else
+#define twl_has_gpio()	false
+#endif
+
+#if defined(CONFIG_REGULATOR_TWL4030) \
+	|| defined(CONFIG_REGULATOR_TWL4030_MODULE)
+#define twl_has_regulator()	true
+#else
+#define twl_has_regulator()	false
+#endif
+
+#if defined(CONFIG_TWL4030_MADC) || defined(CONFIG_TWL4030_MADC_MODULE)
+#define twl_has_madc()	true
+#else
+#define twl_has_madc()	false
+#endif
+
+#ifdef CONFIG_TWL4030_POWER
+#define twl_has_power()        true
+#else
+#define twl_has_power()        false
+#endif
+
+#if defined(CONFIG_RTC_DRV_TWL4030) || defined(CONFIG_RTC_DRV_TWL4030_MODULE)
+#define twl_has_rtc()	true
+#else
+#define twl_has_rtc()	false
+#endif
+
+#if defined(CONFIG_TWL4030_USB) || defined(CONFIG_TWL4030_USB_MODULE)
+#define twl_has_usb()	true
+#else
+#define twl_has_usb()	false
+#endif
+
+#if defined(CONFIG_TWL4030_WATCHDOG) || \
+	defined(CONFIG_TWL4030_WATCHDOG_MODULE)
+#define twl_has_watchdog()        true
+#else
+#define twl_has_watchdog()        false
+#endif
+
+#if defined(CONFIG_TWL4030_CODEC) || defined(CONFIG_TWL4030_CODEC_MODULE)
+#define twl_has_codec()	true
+#else
+#define twl_has_codec()	false
+#endif
+
+/* Triton Core internal information (BEGIN) */
+
+/* Last - for index max*/
+#define TWL4030_MODULE_LAST		TWL4030_MODULE_SECURED_REG
+
+#define TWL4030_NUM_SLAVES		4
+
+#if defined(CONFIG_INPUT_TWL4030_PWRBUTTON) \
+	|| defined(CONFIG_INPUT_TWL4030_PWBUTTON_MODULE)
+#define twl_has_pwrbutton()	true
+#else
+#define twl_has_pwrbutton()	false
+#endif
+
+/* Base Address defns for twl4030_map[] */
+
+/* subchip/slave 0 - USB ID */
+#define TWL4030_BASEADD_USB		0x0000
+
+/* subchip/slave 1 - AUD ID */
+#define TWL4030_BASEADD_AUDIO_VOICE	0x0000
+#define TWL4030_BASEADD_GPIO		0x0098
+#define TWL4030_BASEADD_INTBR		0x0085
+#define TWL4030_BASEADD_PIH		0x0080
+#define TWL4030_BASEADD_TEST		0x004C
+
+/* subchip/slave 2 - AUX ID */
+#define TWL4030_BASEADD_INTERRUPTS	0x00B9
+#define TWL4030_BASEADD_LED		0x00EE
+#define TWL4030_BASEADD_MADC		0x0000
+#define TWL4030_BASEADD_MAIN_CHARGE	0x0074
+#define TWL4030_BASEADD_PRECHARGE	0x00AA
+#define TWL4030_BASEADD_PWM0		0x00F8
+#define TWL4030_BASEADD_PWM1		0x00FB
+#define TWL4030_BASEADD_PWMA		0x00EF
+#define TWL4030_BASEADD_PWMB		0x00F1
+#define TWL4030_BASEADD_KEYPAD		0x00D2
+
+#define TWL5031_BASEADD_ACCESSORY	0x0074 /* Replaces Main Charge */
+#define TWL5031_BASEADD_INTERRUPTS	0x00B9 /* Different than TWL4030's
+						  one */
+
+/* subchip/slave 3 - POWER ID */
+#define TWL4030_BASEADD_BACKUP		0x0014
+#define TWL4030_BASEADD_INT		0x002E
+#define TWL4030_BASEADD_PM_MASTER	0x0036
+#define TWL4030_BASEADD_PM_RECEIVER	0x005B
+#define TWL4030_BASEADD_RTC		0x001C
+#define TWL4030_BASEADD_SECURED_REG	0x0000
+
+/* Triton Core internal information (END) */
+
+
+/* Few power values */
+#define R_CFG_BOOT			0x05
+#define R_PROTECT_KEY			0x0E
+
+/* access control values for R_PROTECT_KEY */
+#define KEY_UNLOCK1			0xce
+#define KEY_UNLOCK2			0xec
+#define KEY_LOCK			0x00
+
+/* some fields in R_CFG_BOOT */
+#define HFCLK_FREQ_19p2_MHZ		(1 << 0)
+#define HFCLK_FREQ_26_MHZ		(2 << 0)
+#define HFCLK_FREQ_38p4_MHZ		(3 << 0)
+#define HIGH_PERF_SQ			(1 << 3)
+#define CK32K_LOWPWR_EN			(1 << 7)
+
+
+/* chip-specific feature flags, for i2c_device_id.driver_data */
+#define TWL4030_VAUX2		BIT(0)	/* pre-5030 voltage ranges */
+#define TPS_SUBSET		BIT(1)	/* tps659[23]0 have fewer LDOs */
+#define TWL5031			BIT(2)  /* twl5031 has different registers */
+
+/*----------------------------------------------------------------------*/
+
+/* is driver active, bound to a chip? */
+static bool inuse;
+
+/* Structure for each TWL4030 Slave */
+struct twl4030_client {
+	struct i2c_client *client;
+	u8 address;
+
+	/* max numb of i2c_msg required is for read =2 */
+	struct i2c_msg xfer_msg[2];
+
+	/* To lock access to xfer_msg */
+	struct mutex xfer_lock;
+};
+
+static struct twl4030_client twl4030_modules[TWL4030_NUM_SLAVES];
+
+
+/* mapping the module id to slave id and base address */
+struct twl4030mapping {
+	unsigned char sid;	/* Slave ID */
+	unsigned char base;	/* base address */
+};
+
+static struct twl4030mapping twl4030_map[TWL4030_MODULE_LAST + 1] = {
+	/*
+	 * NOTE:  don't change this table without updating the
+	 * <linux/i2c/twl4030.h> defines for TWL4030_MODULE_*
+	 * so they continue to match the order in this table.
+	 */
+
+	{ 0, TWL4030_BASEADD_USB },
+
+	{ 1, TWL4030_BASEADD_AUDIO_VOICE },
+	{ 1, TWL4030_BASEADD_GPIO },
+	{ 1, TWL4030_BASEADD_INTBR },
+	{ 1, TWL4030_BASEADD_PIH },
+	{ 1, TWL4030_BASEADD_TEST },
+
+	{ 2, TWL4030_BASEADD_KEYPAD },
+	{ 2, TWL4030_BASEADD_MADC },
+	{ 2, TWL4030_BASEADD_INTERRUPTS },
+	{ 2, TWL4030_BASEADD_LED },
+	{ 2, TWL4030_BASEADD_MAIN_CHARGE },
+	{ 2, TWL4030_BASEADD_PRECHARGE },
+	{ 2, TWL4030_BASEADD_PWM0 },
+	{ 2, TWL4030_BASEADD_PWM1 },
+	{ 2, TWL4030_BASEADD_PWMA },
+	{ 2, TWL4030_BASEADD_PWMB },
+	{ 2, TWL5031_BASEADD_ACCESSORY },
+	{ 2, TWL5031_BASEADD_INTERRUPTS },
+
+	{ 3, TWL4030_BASEADD_BACKUP },
+	{ 3, TWL4030_BASEADD_INT },
+	{ 3, TWL4030_BASEADD_PM_MASTER },
+	{ 3, TWL4030_BASEADD_PM_RECEIVER },
+	{ 3, TWL4030_BASEADD_RTC },
+	{ 3, TWL4030_BASEADD_SECURED_REG },
+};
+
+/*----------------------------------------------------------------------*/
+
+/* Exported Functions */
+
+/**
+ * twl4030_i2c_write - Writes a n bit register in TWL4030
+ * @mod_no: module number
+ * @value: an array of num_bytes+1 containing data to write
+ * @reg: register address (just offset will do)
+ * @num_bytes: number of bytes to transfer
+ *
+ * IMPORTANT: for 'value' parameter: Allocate value num_bytes+1 and
+ * valid data starts at Offset 1.
+ *
+ * Returns the result of operation - 0 is success
+ */
+int twl4030_i2c_write(u8 mod_no, u8 *value, u8 reg, unsigned num_bytes)
+{
+	int ret;
+	int sid;
+	struct twl4030_client *twl;
+	struct i2c_msg *msg;
+
+	if (unlikely(mod_no > TWL4030_MODULE_LAST)) {
+		pr_err("%s: invalid module number %d\n", DRIVER_NAME, mod_no);
+		return -EPERM;
+	}
+	sid = twl4030_map[mod_no].sid;
+	twl = &twl4030_modules[sid];
+
+	if (unlikely(!inuse)) {
+		pr_err("%s: client %d is not initialized\n", DRIVER_NAME, sid);
+		return -EPERM;
+	}
+	mutex_lock(&twl->xfer_lock);
+	/*
+	 * [MSG1]: fill the register address data
+	 * fill the data Tx buffer
+	 */
+	msg = &twl->xfer_msg[0];
+	msg->addr = twl->address;
+	msg->len = num_bytes + 1;
+	msg->flags = 0;
+	msg->buf = value;
+	/* over write the first byte of buffer with the register address */
+	*value = twl4030_map[mod_no].base + reg;
+	ret = i2c_transfer(twl->client->adapter, twl->xfer_msg, 1);
+	mutex_unlock(&twl->xfer_lock);
+
+	/* i2c_transfer returns number of messages transferred */
+	if (ret != 1) {
+		pr_err("%s: i2c_write failed to transfer all messages\n",
+			DRIVER_NAME);
+		if (ret < 0)
+			return ret;
+		else
+			return -EIO;
+	} else {
+		return 0;
+	}
+}
+EXPORT_SYMBOL(twl4030_i2c_write);
+
+/**
+ * twl4030_i2c_read - Reads a n bit register in TWL4030
+ * @mod_no: module number
+ * @value: an array of num_bytes containing data to be read
+ * @reg: register address (just offset will do)
+ * @num_bytes: number of bytes to transfer
+ *
+ * Returns result of operation - num_bytes is success else failure.
+ */
+int twl4030_i2c_read(u8 mod_no, u8 *value, u8 reg, unsigned num_bytes)
+{
+	int ret;
+	u8 val;
+	int sid;
+	struct twl4030_client *twl;
+	struct i2c_msg *msg;
+
+	if (unlikely(mod_no > TWL4030_MODULE_LAST)) {
+		pr_err("%s: invalid module number %d\n", DRIVER_NAME, mod_no);
+		return -EPERM;
+	}
+	sid = twl4030_map[mod_no].sid;
+	twl = &twl4030_modules[sid];
+
+	if (unlikely(!inuse)) {
+		pr_err("%s: client %d is not initialized\n", DRIVER_NAME, sid);
+		return -EPERM;
+	}
+	mutex_lock(&twl->xfer_lock);
+	/* [MSG1] fill the register address data */
+	msg = &twl->xfer_msg[0];
+	msg->addr = twl->address;
+	msg->len = 1;
+	msg->flags = 0;	/* Read the register value */
+	val = twl4030_map[mod_no].base + reg;
+	msg->buf = &val;
+	/* [MSG2] fill the data rx buffer */
+	msg = &twl->xfer_msg[1];
+	msg->addr = twl->address;
+	msg->flags = I2C_M_RD;	/* Read the register value */
+	msg->len = num_bytes;	/* only n bytes */
+	msg->buf = value;
+	ret = i2c_transfer(twl->client->adapter, twl->xfer_msg, 2);
+	mutex_unlock(&twl->xfer_lock);
+
+	/* i2c_transfer returns number of messages transferred */
+	if (ret != 2) {
+		pr_err("%s: i2c_read failed to transfer all messages\n",
+			DRIVER_NAME);
+		if (ret < 0)
+			return ret;
+		else
+			return -EIO;
+	} else {
+		return 0;
+	}
+}
+EXPORT_SYMBOL(twl4030_i2c_read);
+
+/**
+ * twl4030_i2c_write_u8 - Writes a 8 bit register in TWL4030
+ * @mod_no: module number
+ * @value: the value to be written 8 bit
+ * @reg: register address (just offset will do)
+ *
+ * Returns result of operation - 0 is success
+ */
+int twl4030_i2c_write_u8(u8 mod_no, u8 value, u8 reg)
+{
+
+	/* 2 bytes offset 1 contains the data offset 0 is used by i2c_write */
+	u8 temp_buffer[2] = { 0 };
+	/* offset 1 contains the data */
+	temp_buffer[1] = value;
+	return twl4030_i2c_write(mod_no, temp_buffer, reg, 1);
+}
+EXPORT_SYMBOL(twl4030_i2c_write_u8);
+
+/**
+ * twl4030_i2c_read_u8 - Reads a 8 bit register from TWL4030
+ * @mod_no: module number
+ * @value: the value read 8 bit
+ * @reg: register address (just offset will do)
+ *
+ * Returns result of operation - 0 is success
+ */
+int twl4030_i2c_read_u8(u8 mod_no, u8 *value, u8 reg)
+{
+	return twl4030_i2c_read(mod_no, value, reg, 1);
+}
+EXPORT_SYMBOL(twl4030_i2c_read_u8);
+
+/*----------------------------------------------------------------------*/
+
+static struct device *
+add_numbered_child(unsigned chip, const char *name, int num,
+		void *pdata, unsigned pdata_len,
+		bool can_wakeup, int irq0, int irq1)
+{
+	struct platform_device	*pdev;
+	struct twl4030_client	*twl = &twl4030_modules[chip];
+	int			status;
+
+	pdev = platform_device_alloc(name, num);
+	if (!pdev) {
+		dev_dbg(&twl->client->dev, "can't alloc dev\n");
+		status = -ENOMEM;
+		goto err;
+	}
+
+	device_init_wakeup(&pdev->dev, can_wakeup);
+	pdev->dev.parent = &twl->client->dev;
+
+	if (pdata) {
+		status = platform_device_add_data(pdev, pdata, pdata_len);
+		if (status < 0) {
+			dev_dbg(&pdev->dev, "can't add platform_data\n");
+			goto err;
+		}
+	}
+
+	if (irq0) {
+		struct resource r[2] = {
+			{ .start = irq0, .flags = IORESOURCE_IRQ, },
+			{ .start = irq1, .flags = IORESOURCE_IRQ, },
+		};
+
+		status = platform_device_add_resources(pdev, r, irq1 ? 2 : 1);
+		if (status < 0) {
+			dev_dbg(&pdev->dev, "can't add irqs\n");
+			goto err;
+		}
+	}
+
+	status = platform_device_add(pdev);
+
+err:
+	if (status < 0) {
+		platform_device_put(pdev);
+		dev_err(&twl->client->dev, "can't add %s dev\n", name);
+		return ERR_PTR(status);
+	}
+	return &pdev->dev;
+}
+
+static inline struct device *add_child(unsigned chip, const char *name,
+		void *pdata, unsigned pdata_len,
+		bool can_wakeup, int irq0, int irq1)
+{
+	return add_numbered_child(chip, name, -1, pdata, pdata_len,
+		can_wakeup, irq0, irq1);
+}
+
+static struct device *
+add_regulator_linked(int num, struct regulator_init_data *pdata,
+		struct regulator_consumer_supply *consumers,
+		unsigned num_consumers)
+{
+	/* regulator framework demands init_data ... */
+	if (!pdata)
+		return NULL;
+
+	if (consumers) {
+		pdata->consumer_supplies = consumers;
+		pdata->num_consumer_supplies = num_consumers;
+	}
+
+	/* NOTE:  we currently ignore regulator IRQs, e.g. for short circuits */
+	return add_numbered_child(3, "twl4030_reg", num,
+		pdata, sizeof(*pdata), false, 0, 0);
+}
+
+static struct device *
+add_regulator(int num, struct regulator_init_data *pdata)
+{
+	return add_regulator_linked(num, pdata, NULL, 0);
+}
+
+/*
+ * NOTE:  We know the first 8 IRQs after pdata->base_irq are
+ * for the PIH, and the next are for the PWR_INT SIH, since
+ * that's how twl_init_irq() sets things up.
+ */
+
+static int
+add_children(struct twl4030_platform_data *pdata, unsigned long features)
+{
+	struct device	*child;
+
+	if (twl_has_bci() && pdata->bci &&
+	    !(features & (TPS_SUBSET | TWL5031))) {
+		child = add_child(3, "twl4030_bci",
+				pdata->bci, sizeof(*pdata->bci),
+				false,
+				/* irq0 = CHG_PRES, irq1 = BCI */
+				pdata->irq_base + 8 + 1, pdata->irq_base + 2);
+		if (IS_ERR(child))
+			return PTR_ERR(child);
+	}
+
+	if (twl_has_gpio() && pdata->gpio) {
+		child = add_child(1, "twl4030_gpio",
+				pdata->gpio, sizeof(*pdata->gpio),
+				false, pdata->irq_base + 0, 0);
+		if (IS_ERR(child))
+			return PTR_ERR(child);
+	}
+
+	if (twl_has_keypad() && pdata->keypad) {
+		child = add_child(2, "twl4030_keypad",
+				pdata->keypad, sizeof(*pdata->keypad),
+				true, pdata->irq_base + 1, 0);
+		if (IS_ERR(child))
+			return PTR_ERR(child);
+	}
+
+	if (twl_has_madc() && pdata->madc) {
+		child = add_child(2, "twl4030_madc",
+				pdata->madc, sizeof(*pdata->madc),
+				true, pdata->irq_base + 3, 0);
+		if (IS_ERR(child))
+			return PTR_ERR(child);
+	}
+
+	if (twl_has_rtc()) {
+		/*
+		 * REVISIT platform_data here currently might expose the
+		 * "msecure" line ... but for now we just expect board
+		 * setup to tell the chip "it's always ok to SET_TIME".
+		 * Eventually, Linux might become more aware of such
+		 * HW security concerns, and "least privilege".
+		 */
+		child = add_child(3, "twl4030_rtc",
+				NULL, 0,
+				true, pdata->irq_base + 8 + 3, 0);
+		if (IS_ERR(child))
+			return PTR_ERR(child);
+	}
+
+	if (twl_has_usb() && pdata->usb) {
+
+		static struct regulator_consumer_supply usb1v5 = {
+			.supply =	"usb1v5",
+		};
+		static struct regulator_consumer_supply usb1v8 = {
+			.supply =	"usb1v8",
+		};
+		static struct regulator_consumer_supply usb3v1 = {
+			.supply =	"usb3v1",
+		};
+
+	/* First add the regulators so that they can be used by transceiver */
+		if (twl_has_regulator()) {
+			/* this is a template that gets copied */
+			struct regulator_init_data usb_fixed = {
+				.constraints.valid_modes_mask =
+					REGULATOR_MODE_NORMAL
+					| REGULATOR_MODE_STANDBY,
+				.constraints.valid_ops_mask =
+					REGULATOR_CHANGE_MODE
+					| REGULATOR_CHANGE_STATUS,
+			};
+
+			child = add_regulator_linked(TWL4030_REG_VUSB1V5,
+						      &usb_fixed, &usb1v5, 1);
+			if (IS_ERR(child))
+				return PTR_ERR(child);
+
+			child = add_regulator_linked(TWL4030_REG_VUSB1V8,
+						      &usb_fixed, &usb1v8, 1);
+			if (IS_ERR(child))
+				return PTR_ERR(child);
+
+			child = add_regulator_linked(TWL4030_REG_VUSB3V1,
+						      &usb_fixed, &usb3v1, 1);
+			if (IS_ERR(child))
+				return PTR_ERR(child);
+
+		}
+
+		child = add_child(0, "twl4030_usb",
+				pdata->usb, sizeof(*pdata->usb),
+				true,
+				/* irq0 = USB_PRES, irq1 = USB */
+				pdata->irq_base + 8 + 2, pdata->irq_base + 4);
+
+		if (IS_ERR(child))
+			return PTR_ERR(child);
+
+		/* we need to connect regulators to this transceiver */
+		if (twl_has_regulator() && child) {
+			usb1v5.dev = child;
+			usb1v8.dev = child;
+			usb3v1.dev = child;
+		}
+	}
+
+	if (twl_has_watchdog()) {
+		child = add_child(0, "twl4030_wdt", NULL, 0, false, 0, 0);
+		if (IS_ERR(child))
+			return PTR_ERR(child);
+	}
+
+	if (twl_has_pwrbutton()) {
+		child = add_child(1, "twl4030_pwrbutton",
+				NULL, 0, true, pdata->irq_base + 8 + 0, 0);
+		if (IS_ERR(child))
+			return PTR_ERR(child);
+	}
+
+	if (twl_has_codec() && pdata->codec) {
+		child = add_child(1, "twl4030_codec",
+				pdata->codec, sizeof(*pdata->codec),
+				false, 0, 0);
+		if (IS_ERR(child))
+			return PTR_ERR(child);
+	}
+
+	if (twl_has_regulator()) {
+		child = add_regulator(TWL4030_REG_VPLL1, pdata->vpll1);
+		if (IS_ERR(child))
+			return PTR_ERR(child);
+
+		child = add_regulator(TWL4030_REG_VIO, pdata->vio);
+		if (IS_ERR(child))
+			return PTR_ERR(child);
+
+		child = add_regulator(TWL4030_REG_VDD1, pdata->vdd1);
+		if (IS_ERR(child))
+			return PTR_ERR(child);
+
+		child = add_regulator(TWL4030_REG_VDD2, pdata->vdd2);
+		if (IS_ERR(child))
+			return PTR_ERR(child);
+
+		child = add_regulator(TWL4030_REG_VMMC1, pdata->vmmc1);
+		if (IS_ERR(child))
+			return PTR_ERR(child);
+
+		child = add_regulator(TWL4030_REG_VDAC, pdata->vdac);
+		if (IS_ERR(child))
+			return PTR_ERR(child);
+
+		child = add_regulator((features & TWL4030_VAUX2)
+					? TWL4030_REG_VAUX2_4030
+					: TWL4030_REG_VAUX2,
+				pdata->vaux2);
+		if (IS_ERR(child))
+			return PTR_ERR(child);
+
+		child = add_regulator(TWL4030_REG_VINTANA1, pdata->vintana1);
+		if (IS_ERR(child))
+			return PTR_ERR(child);
+
+		child = add_regulator(TWL4030_REG_VINTANA2, pdata->vintana2);
+		if (IS_ERR(child))
+			return PTR_ERR(child);
+
+		child = add_regulator(TWL4030_REG_VINTDIG, pdata->vintdig);
+		if (IS_ERR(child))
+			return PTR_ERR(child);
+	}
+
+	/* maybe add LDOs that are omitted on cost-reduced parts */
+	if (twl_has_regulator() && !(features & TPS_SUBSET)) {
+		child = add_regulator(TWL4030_REG_VPLL2, pdata->vpll2);
+		if (IS_ERR(child))
+			return PTR_ERR(child);
+
+		child = add_regulator(TWL4030_REG_VMMC2, pdata->vmmc2);
+		if (IS_ERR(child))
+			return PTR_ERR(child);
+
+		child = add_regulator(TWL4030_REG_VSIM, pdata->vsim);
+		if (IS_ERR(child))
+			return PTR_ERR(child);
+
+		child = add_regulator(TWL4030_REG_VAUX1, pdata->vaux1);
+		if (IS_ERR(child))
+			return PTR_ERR(child);
+
+		child = add_regulator(TWL4030_REG_VAUX3, pdata->vaux3);
+		if (IS_ERR(child))
+			return PTR_ERR(child);
+
+		child = add_regulator(TWL4030_REG_VAUX4, pdata->vaux4);
+		if (IS_ERR(child))
+			return PTR_ERR(child);
+	}
+
+	return 0;
+}
+
+/*----------------------------------------------------------------------*/
+
+/*
+ * These three functions initialize the on-chip clock framework,
+ * letting it generate the right frequencies for USB, MADC, and
+ * other purposes.
+ */
+static inline int __init protect_pm_master(void)
+{
+	int e = 0;
+
+	e = twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, KEY_LOCK,
+			R_PROTECT_KEY);
+	return e;
+}
+
+static inline int __init unprotect_pm_master(void)
+{
+	int e = 0;
+
+	e |= twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, KEY_UNLOCK1,
+			R_PROTECT_KEY);
+	e |= twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, KEY_UNLOCK2,
+			R_PROTECT_KEY);
+	return e;
+}
+
+static void clocks_init(struct device *dev,
+			struct twl4030_clock_init_data *clock)
+{
+	int e = 0;
+	struct clk *osc;
+	u32 rate;
+	u8 ctrl = HFCLK_FREQ_26_MHZ;
+
+#if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
+	if (cpu_is_omap2430())
+		osc = clk_get(dev, "osc_ck");
+	else
+		osc = clk_get(dev, "osc_sys_ck");
+
+	if (IS_ERR(osc)) {
+		printk(KERN_WARNING "Skipping twl4030 internal clock init and "
+				"using bootloader value (unknown osc rate)\n");
+		return;
+	}
+
+	rate = clk_get_rate(osc);
+	clk_put(osc);
+
+#else
+	/* REVISIT for non-OMAP systems, pass the clock rate from
+	 * board init code, using platform_data.
+	 */
+	osc = ERR_PTR(-EIO);
+
+	printk(KERN_WARNING "Skipping twl4030 internal clock init and "
+	       "using bootloader value (unknown osc rate)\n");
+
+	return;
+#endif
+
+	switch (rate) {
+	case 19200000:
+		ctrl = HFCLK_FREQ_19p2_MHZ;
+		break;
+	case 26000000:
+		ctrl = HFCLK_FREQ_26_MHZ;
+		break;
+	case 38400000:
+		ctrl = HFCLK_FREQ_38p4_MHZ;
+		break;
+	}
+
+	ctrl |= HIGH_PERF_SQ;
+	if (clock && clock->ck32k_lowpwr_enable)
+		ctrl |= CK32K_LOWPWR_EN;
+
+	e |= unprotect_pm_master();
+	/* effect->MADC+USB ck en */
+	e |= twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, ctrl, R_CFG_BOOT);
+	e |= protect_pm_master();
+
+	if (e < 0)
+		pr_err("%s: clock init err [%d]\n", DRIVER_NAME, e);
+}
+
+/*----------------------------------------------------------------------*/
+
+int twl_init_irq(int irq_num, unsigned irq_base, unsigned irq_end);
+int twl_exit_irq(void);
+int twl_init_chip_irq(const char *chip);
+
+static int twl4030_remove(struct i2c_client *client)
+{
+	unsigned i;
+	int status;
+
+	status = twl_exit_irq();
+	if (status < 0)
+		return status;
+
+	for (i = 0; i < TWL4030_NUM_SLAVES; i++) {
+		struct twl4030_client	*twl = &twl4030_modules[i];
+
+		if (twl->client && twl->client != client)
+			i2c_unregister_device(twl->client);
+		twl4030_modules[i].client = NULL;
+	}
+	inuse = false;
+	return 0;
+}
+
+/* NOTE:  this driver only handles a single twl4030/tps659x0 chip */
+static int __init
+twl4030_probe(struct i2c_client *client, const struct i2c_device_id *id)
+{
+	int				status;
+	unsigned			i;
+	struct twl4030_platform_data	*pdata = client->dev.platform_data;
+
+	if (!pdata) {
+		dev_dbg(&client->dev, "no platform data?\n");
+		return -EINVAL;
+	}
+
+	if (i2c_check_functionality(client->adapter, I2C_FUNC_I2C) == 0) {
+		dev_dbg(&client->dev, "can't talk I2C?\n");
+		return -EIO;
+	}
+
+	if (inuse) {
+		dev_dbg(&client->dev, "driver is already in use\n");
+		return -EBUSY;
+	}
+
+	for (i = 0; i < TWL4030_NUM_SLAVES; i++) {
+		struct twl4030_client	*twl = &twl4030_modules[i];
+
+		twl->address = client->addr + i;
+		if (i == 0)
+			twl->client = client;
+		else {
+			twl->client = i2c_new_dummy(client->adapter,
+					twl->address);
+			if (!twl->client) {
+				dev_err(&client->dev,
+					"can't attach client %d\n", i);
+				status = -ENOMEM;
+				goto fail;
+			}
+		}
+		mutex_init(&twl->xfer_lock);
+	}
+	inuse = true;
+
+	/* setup clock framework */
+	clocks_init(&client->dev, pdata->clock);
+
+	/* load power event scripts */
+	if (twl_has_power() && pdata->power)
+		twl4030_power_init(pdata->power);
+
+	/* Maybe init the T2 Interrupt subsystem */
+	if (client->irq
+			&& pdata->irq_base
+			&& pdata->irq_end > pdata->irq_base) {
+		twl_init_chip_irq(id->name);
+		status = twl_init_irq(client->irq, pdata->irq_base, pdata->irq_end);
+		if (status < 0)
+			goto fail;
+	}
+
+	status = add_children(pdata, id->driver_data);
+fail:
+	if (status < 0)
+		twl4030_remove(client);
+	return status;
+}
+
+static const struct i2c_device_id twl4030_ids[] = {
+	{ "twl4030", TWL4030_VAUX2 },	/* "Triton 2" */
+	{ "twl5030", 0 },		/* T2 updated */
+	{ "twl5031", TWL5031 },		/* TWL5030 updated */
+	{ "tps65950", 0 },		/* catalog version of twl5030 */
+	{ "tps65930", TPS_SUBSET },	/* fewer LDOs and DACs; no charger */
+	{ "tps65920", TPS_SUBSET },	/* fewer LDOs; no codec or charger */
+	{ /* end of list */ },
+};
+MODULE_DEVICE_TABLE(i2c, twl4030_ids);
+
+/* One Client Driver , 4 Clients */
+static struct i2c_driver twl4030_driver = {
+	.driver.name	= DRIVER_NAME,
+	.id_table	= twl4030_ids,
+	.probe		= twl4030_probe,
+	.remove		= twl4030_remove,
+};
+
+static int __init twl4030_init(void)
+{
+	return i2c_add_driver(&twl4030_driver);
+}
+subsys_initcall(twl4030_init);
+
+static void __exit twl4030_exit(void)
+{
+	i2c_del_driver(&twl4030_driver);
+}
+module_exit(twl4030_exit);
+
+MODULE_AUTHOR("Texas Instruments, Inc.");
+MODULE_DESCRIPTION("I2C Core interface for TWL4030");
+MODULE_LICENSE("GPL");