/*
 * 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/twl4030.h>

#if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
#include <mach/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

#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


/* Triton Core internal information (BEGIN) */

/* Last - for index max*/
#define TWL4030_MODULE_LAST             TWL4030_MODULE_SECURED_REG

#define TWL4030_NUM_SLAVES              4


/* 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

/* 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)


/* 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 */

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

/* 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 },

        { 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);

        /* i2cTransfer returns num messages.translate it pls.. */
        if (ret >= 0)
                ret = 0;
        return ret;
}
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);

        /* i2cTransfer returns num messages.translate it pls.. */
        if (ret >= 0)
                ret = 0;
        return ret;
}
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;
        struct device   *usb_transceiver = NULL;

        if (twl_has_bci() && pdata->bci && !(features & TPS_SUBSET)) {
                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) {
                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 */
                usb_transceiver = 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_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);
        }

        if (twl_has_regulator() && usb_transceiver) {
                static struct regulator_consumer_supply usb1v5 = {
                        .supply =       "usb1v5",
                };
                static struct regulator_consumer_supply usb1v8 = {
                        .supply =       "usb1v8",
                };
                static struct regulator_consumer_supply usb3v1 = {
                        .supply =       "usb3v1",
                };

                /* 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,
                };

                usb1v5.dev = usb_transceiver;
                usb1v8.dev = usb_transceiver;
                usb3v1.dev = usb_transceiver;

                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);
        }

        /* 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 __init clocks_init(struct device *dev)
{
        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;
        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);

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
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(&twl->client->dev,
                                        "can't attach client %d\n", i);
                                status = -ENOMEM;
                                goto fail;
                        }
                        strlcpy(twl->client->name, id->name,
                                        sizeof(twl->client->name));
                }
                mutex_init(&twl->xfer_lock);
        }
        inuse = true;

        /* setup clock framework */
        clocks_init(&client->dev);

        /* Maybe init the T2 Interrupt subsystem */
        if (client->irq
                        && pdata->irq_base
                        && pdata->irq_end > pdata->irq_base) {
                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 */
        { "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");