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kernel-fxtec-pro1x/drivers/mfd/twl4030-core.c
David Brownell a30d46c042 mfd: twl4030 IRQ handling update 
- Move it into a separate file; clean and streamline it
 - Restructure the init code for reuse during secondary dispatch
 - Support both levels (primary, secondary) of IRQ dispatch
 - Use a workqueue for irq mask/unmask and trigger configuration

Code for two subchips currently share that secondary handler code.
One is the power subchip; its IRQs are now handled by this core,
courtesy of this patch.  The other is the GPIO module, which will
be supported through a later patch.

There are also minor changes to the header file, mostly related
to GPIO support; nothing yet in mainline cares about those.  A
few references to OMAP-specific symbols are disabled; when they
can all be removed, the TWL4030 support ceases being OMAP-specific.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Samuel Ortiz <sameo@openedhand.com>
2008-10-22 01:19:37 +02:00

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/*
* 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/i2c.h>
#include <linux/i2c/twl4030.h>
/*
* 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_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)
/*----------------------------------------------------------------------*/
/* 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, u8 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, u8 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);
/*----------------------------------------------------------------------*/
/*
* 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)
{
struct platform_device *pdev = NULL;
struct twl4030_client *twl = NULL;
int status = 0;
if (twl_has_bci() && pdata->bci) {
twl = &twl4030_modules[3];
pdev = platform_device_alloc("twl4030_bci", -1);
if (!pdev) {
pr_debug("%s: can't alloc bci dev\n", DRIVER_NAME);
status = -ENOMEM;
goto err;
}
if (status == 0) {
pdev->dev.parent = &twl->client->dev;
status = platform_device_add_data(pdev, pdata->bci,
sizeof(*pdata->bci));
if (status < 0) {
dev_dbg(&twl->client->dev,
"can't add bci data, %d\n",
status);
goto err;
}
}
if (status == 0) {
struct resource r = {
.start = pdata->irq_base + 8 + 1,
.flags = IORESOURCE_IRQ,
};
status = platform_device_add_resources(pdev, &r, 1);
}
if (status == 0)
status = platform_device_add(pdev);
if (status < 0) {
platform_device_put(pdev);
dev_dbg(&twl->client->dev,
"can't create bci dev, %d\n",
status);
goto err;
}
}
if (twl_has_gpio() && pdata->gpio) {
twl = &twl4030_modules[1];
pdev = platform_device_alloc("twl4030_gpio", -1);
if (!pdev) {
pr_debug("%s: can't alloc gpio dev\n", DRIVER_NAME);
status = -ENOMEM;
goto err;
}
/* more driver model init */
if (status == 0) {
pdev->dev.parent = &twl->client->dev;
/* device_init_wakeup(&pdev->dev, 1); */
status = platform_device_add_data(pdev, pdata->gpio,
sizeof(*pdata->gpio));
if (status < 0) {
dev_dbg(&twl->client->dev,
"can't add gpio data, %d\n",
status);
goto err;
}
}
/* GPIO module IRQ */
if (status == 0) {
struct resource r = {
.start = pdata->irq_base + 0,
.flags = IORESOURCE_IRQ,
};
status = platform_device_add_resources(pdev, &r, 1);
}
if (status == 0)
status = platform_device_add(pdev);
if (status < 0) {
platform_device_put(pdev);
dev_dbg(&twl->client->dev,
"can't create gpio dev, %d\n",
status);
goto err;
}
}
if (twl_has_keypad() && pdata->keypad) {
pdev = platform_device_alloc("twl4030_keypad", -1);
if (pdev) {
twl = &twl4030_modules[2];
pdev->dev.parent = &twl->client->dev;
device_init_wakeup(&pdev->dev, 1);
status = platform_device_add_data(pdev, pdata->keypad,
sizeof(*pdata->keypad));
if (status < 0) {
dev_dbg(&twl->client->dev,
"can't add keypad data, %d\n",
status);
platform_device_put(pdev);
goto err;
}
status = platform_device_add(pdev);
if (status < 0) {
platform_device_put(pdev);
dev_dbg(&twl->client->dev,
"can't create keypad dev, %d\n",
status);
goto err;
}
} else {
pr_debug("%s: can't alloc keypad dev\n", DRIVER_NAME);
status = -ENOMEM;
goto err;
}
}
if (twl_has_madc() && pdata->madc) {
pdev = platform_device_alloc("twl4030_madc", -1);
if (pdev) {
twl = &twl4030_modules[2];
pdev->dev.parent = &twl->client->dev;
device_init_wakeup(&pdev->dev, 1);
status = platform_device_add_data(pdev, pdata->madc,
sizeof(*pdata->madc));
if (status < 0) {
platform_device_put(pdev);
dev_dbg(&twl->client->dev,
"can't add madc data, %d\n",
status);
goto err;
}
status = platform_device_add(pdev);
if (status < 0) {
platform_device_put(pdev);
dev_dbg(&twl->client->dev,
"can't create madc dev, %d\n",
status);
goto err;
}
} else {
pr_debug("%s: can't alloc madc dev\n", DRIVER_NAME);
status = -ENOMEM;
goto err;
}
}
if (twl_has_rtc()) {
twl = &twl4030_modules[3];
pdev = platform_device_alloc("twl4030_rtc", -1);
if (!pdev) {
pr_debug("%s: can't alloc rtc dev\n", DRIVER_NAME);
status = -ENOMEM;
} else {
pdev->dev.parent = &twl->client->dev;
device_init_wakeup(&pdev->dev, 1);
}
/*
* REVISIT platform_data here currently might use of
* "msecure" line ... but for now we just expect board
* setup to tell the chip "we are secure" at all times.
* Eventually, Linux might become more aware of such
* HW security concerns, and "least privilege".
*/
/* RTC module IRQ */
if (status == 0) {
struct resource r = {
.start = pdata->irq_base + 8 + 3,
.flags = IORESOURCE_IRQ,
};
status = platform_device_add_resources(pdev, &r, 1);
}
if (status == 0)
status = platform_device_add(pdev);
if (status < 0) {
platform_device_put(pdev);
dev_dbg(&twl->client->dev,
"can't create rtc dev, %d\n",
status);
goto err;
}
}
if (twl_has_usb() && pdata->usb) {
twl = &twl4030_modules[0];
pdev = platform_device_alloc("twl4030_usb", -1);
if (!pdev) {
pr_debug("%s: can't alloc usb dev\n", DRIVER_NAME);
status = -ENOMEM;
goto err;
}
if (status == 0) {
pdev->dev.parent = &twl->client->dev;
device_init_wakeup(&pdev->dev, 1);
status = platform_device_add_data(pdev, pdata->usb,
sizeof(*pdata->usb));
if (status < 0) {
platform_device_put(pdev);
dev_dbg(&twl->client->dev,
"can't add usb data, %d\n",
status);
goto err;
}
}
if (status == 0) {
struct resource r = {
.start = pdata->irq_base + 8 + 2,
.flags = IORESOURCE_IRQ,
};
status = platform_device_add_resources(pdev, &r, 1);
}
if (status == 0)
status = platform_device_add(pdev);
if (status < 0) {
platform_device_put(pdev);
dev_dbg(&twl->client->dev,
"can't create usb dev, %d\n",
status);
}
}
err:
if (status)
pr_err("failed to add twl4030's children (status %d)\n", status);
return status;
}
/*----------------------------------------------------------------------*/
/*
* 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(void)
{
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(NULL, "osc_ck");
else
osc = clk_get(NULL, "osc_sys_ck");
#else
/* REVISIT for non-OMAP systems, pass the clock rate from
* board init code, using platform_data.
*/
osc = ERR_PTR(-EIO);
#endif
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);
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();
/* 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);
fail:
if (status < 0)
twl4030_remove(client);
return status;
}
static const struct i2c_device_id twl4030_ids[] = {
{ "twl4030", 0 }, /* "Triton 2" */
{ "tps65950", 0 }, /* catalog version of twl4030 */
{ "tps65930", 0 }, /* fewer LDOs and DACs; no charger */
{ "tps65920", 0 }, /* fewer LDOs; no codec or charger */
{ "twl5030", 0 }, /* T2 updated */
{ /* 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");
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