2 * twl4030_core.c - driver for TWL4030/TPS659x0 PM and audio CODEC devices
4 * Copyright (C) 2005-2006 Texas Instruments, Inc.
6 * Modifications to defer interrupt handling to a kernel thread:
7 * Copyright (C) 2006 MontaVista Software, Inc.
9 * Based on tlv320aic23.c:
10 * Copyright (c) by Kai Svahn <kai.svahn@nokia.com>
12 * Code cleanup and modifications to IRQ handler.
13 * by syed khasim <x0khasim@ti.com>
15 * This program is free software; you can redistribute it and/or modify
16 * it under the terms of the GNU General Public License as published by
17 * the Free Software Foundation; either version 2 of the License, or
18 * (at your option) any later version.
20 * This program is distributed in the hope that it will be useful,
21 * but WITHOUT ANY WARRANTY; without even the implied warranty of
22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23 * GNU General Public License for more details.
25 * You should have received a copy of the GNU General Public License
26 * along with this program; if not, write to the Free Software
27 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
30 #include <linux/init.h>
31 #include <linux/mutex.h>
32 #include <linux/platform_device.h>
33 #include <linux/clk.h>
34 #include <linux/err.h>
36 #include <linux/regulator/machine.h>
38 #include <linux/i2c.h>
39 #include <linux/i2c/twl4030.h>
46 * The TWL4030 "Triton 2" is one of a family of a multi-function "Power
47 * Management and System Companion Device" chips originally designed for
48 * use in OMAP2 and OMAP 3 based systems. Its control interfaces use I2C,
49 * often at around 3 Mbit/sec, including for interrupt handling.
51 * This driver core provides genirq support for the interrupts emitted,
52 * by the various modules, and exports register access primitives.
54 * FIXME this driver currently requires use of the first interrupt line
55 * (and associated registers).
58 #define DRIVER_NAME "twl4030"
60 #if defined(CONFIG_TWL4030_BCI_BATTERY) || \
61 defined(CONFIG_TWL4030_BCI_BATTERY_MODULE)
62 #define twl_has_bci() true
64 #define twl_has_bci() false
67 #if defined(CONFIG_KEYBOARD_TWL4030) || defined(CONFIG_KEYBOARD_TWL4030_MODULE)
68 #define twl_has_keypad() true
70 #define twl_has_keypad() false
73 #if defined(CONFIG_GPIO_TWL4030) || defined(CONFIG_GPIO_TWL4030_MODULE)
74 #define twl_has_gpio() true
76 #define twl_has_gpio() false
79 #if defined(CONFIG_REGULATOR_TWL4030) \
80 || defined(CONFIG_REGULATOR_TWL4030_MODULE)
81 #define twl_has_regulator() true
83 #define twl_has_regulator() false
86 #if defined(CONFIG_TWL4030_MADC) || defined(CONFIG_TWL4030_MADC_MODULE)
87 #define twl_has_madc() true
89 #define twl_has_madc() false
92 #ifdef CONFIG_TWL4030_POWER
93 #define twl_has_power() true
95 #define twl_has_power() false
98 #if defined(CONFIG_RTC_DRV_TWL4030) || defined(CONFIG_RTC_DRV_TWL4030_MODULE)
99 #define twl_has_rtc() true
101 #define twl_has_rtc() false
104 #if defined(CONFIG_TWL4030_USB) || defined(CONFIG_TWL4030_USB_MODULE)
105 #define twl_has_usb() true
107 #define twl_has_usb() false
111 /* Triton Core internal information (BEGIN) */
113 /* Last - for index max*/
114 #define TWL4030_MODULE_LAST TWL4030_MODULE_SECURED_REG
116 #define TWL4030_NUM_SLAVES 4
119 /* Base Address defns for twl4030_map[] */
121 /* subchip/slave 0 - USB ID */
122 #define TWL4030_BASEADD_USB 0x0000
124 /* subchip/slave 1 - AUD ID */
125 #define TWL4030_BASEADD_AUDIO_VOICE 0x0000
126 #define TWL4030_BASEADD_GPIO 0x0098
127 #define TWL4030_BASEADD_INTBR 0x0085
128 #define TWL4030_BASEADD_PIH 0x0080
129 #define TWL4030_BASEADD_TEST 0x004C
131 /* subchip/slave 2 - AUX ID */
132 #define TWL4030_BASEADD_INTERRUPTS 0x00B9
133 #define TWL4030_BASEADD_LED 0x00EE
134 #define TWL4030_BASEADD_MADC 0x0000
135 #define TWL4030_BASEADD_MAIN_CHARGE 0x0074
136 #define TWL4030_BASEADD_PRECHARGE 0x00AA
137 #define TWL4030_BASEADD_PWM0 0x00F8
138 #define TWL4030_BASEADD_PWM1 0x00FB
139 #define TWL4030_BASEADD_PWMA 0x00EF
140 #define TWL4030_BASEADD_PWMB 0x00F1
141 #define TWL4030_BASEADD_KEYPAD 0x00D2
143 /* subchip/slave 3 - POWER ID */
144 #define TWL4030_BASEADD_BACKUP 0x0014
145 #define TWL4030_BASEADD_INT 0x002E
146 #define TWL4030_BASEADD_PM_MASTER 0x0036
147 #define TWL4030_BASEADD_PM_RECEIVER 0x005B
148 #define TWL4030_BASEADD_RTC 0x001C
149 #define TWL4030_BASEADD_SECURED_REG 0x0000
151 /* Triton Core internal information (END) */
154 /* Few power values */
155 #define R_CFG_BOOT 0x05
156 #define R_PROTECT_KEY 0x0E
158 /* access control values for R_PROTECT_KEY */
159 #define KEY_UNLOCK1 0xce
160 #define KEY_UNLOCK2 0xec
161 #define KEY_LOCK 0x00
163 /* some fields in R_CFG_BOOT */
164 #define HFCLK_FREQ_19p2_MHZ (1 << 0)
165 #define HFCLK_FREQ_26_MHZ (2 << 0)
166 #define HFCLK_FREQ_38p4_MHZ (3 << 0)
167 #define HIGH_PERF_SQ (1 << 3)
170 /* chip-specific feature flags, for i2c_device_id.driver_data */
171 #define TWL4030_VAUX2 BIT(0) /* pre-5030 voltage ranges */
172 #define TPS_SUBSET BIT(1) /* tps659[23]0 have fewer LDOs */
174 /*----------------------------------------------------------------------*/
176 /* is driver active, bound to a chip? */
179 /* Structure for each TWL4030 Slave */
180 struct twl4030_client {
181 struct i2c_client *client;
184 /* max numb of i2c_msg required is for read =2 */
185 struct i2c_msg xfer_msg[2];
187 /* To lock access to xfer_msg */
188 struct mutex xfer_lock;
191 static struct twl4030_client twl4030_modules[TWL4030_NUM_SLAVES];
194 /* mapping the module id to slave id and base address */
195 struct twl4030mapping {
196 unsigned char sid; /* Slave ID */
197 unsigned char base; /* base address */
200 static struct twl4030mapping twl4030_map[TWL4030_MODULE_LAST + 1] = {
202 * NOTE: don't change this table without updating the
203 * <linux/i2c/twl4030.h> defines for TWL4030_MODULE_*
204 * so they continue to match the order in this table.
207 { 0, TWL4030_BASEADD_USB },
209 { 1, TWL4030_BASEADD_AUDIO_VOICE },
210 { 1, TWL4030_BASEADD_GPIO },
211 { 1, TWL4030_BASEADD_INTBR },
212 { 1, TWL4030_BASEADD_PIH },
213 { 1, TWL4030_BASEADD_TEST },
215 { 2, TWL4030_BASEADD_KEYPAD },
216 { 2, TWL4030_BASEADD_MADC },
217 { 2, TWL4030_BASEADD_INTERRUPTS },
218 { 2, TWL4030_BASEADD_LED },
219 { 2, TWL4030_BASEADD_MAIN_CHARGE },
220 { 2, TWL4030_BASEADD_PRECHARGE },
221 { 2, TWL4030_BASEADD_PWM0 },
222 { 2, TWL4030_BASEADD_PWM1 },
223 { 2, TWL4030_BASEADD_PWMA },
224 { 2, TWL4030_BASEADD_PWMB },
226 { 3, TWL4030_BASEADD_BACKUP },
227 { 3, TWL4030_BASEADD_INT },
228 { 3, TWL4030_BASEADD_PM_MASTER },
229 { 3, TWL4030_BASEADD_PM_RECEIVER },
230 { 3, TWL4030_BASEADD_RTC },
231 { 3, TWL4030_BASEADD_SECURED_REG },
234 extern void twl4030_power_init(struct twl4030_power_data *triton2_scripts);
236 /*----------------------------------------------------------------------*/
238 /* Exported Functions */
241 * twl4030_i2c_write - Writes a n bit register in TWL4030
242 * @mod_no: module number
243 * @value: an array of num_bytes+1 containing data to write
244 * @reg: register address (just offset will do)
245 * @num_bytes: number of bytes to transfer
247 * IMPORTANT: for 'value' parameter: Allocate value num_bytes+1 and
248 * valid data starts at Offset 1.
250 * Returns the result of operation - 0 is success
252 int twl4030_i2c_write(u8 mod_no, u8 *value, u8 reg, unsigned num_bytes)
256 struct twl4030_client *twl;
259 if (unlikely(mod_no > TWL4030_MODULE_LAST)) {
260 pr_err("%s: invalid module number %d\n", DRIVER_NAME, mod_no);
263 sid = twl4030_map[mod_no].sid;
264 twl = &twl4030_modules[sid];
266 if (unlikely(!inuse)) {
267 pr_err("%s: client %d is not initialized\n", DRIVER_NAME, sid);
270 mutex_lock(&twl->xfer_lock);
272 * [MSG1]: fill the register address data
273 * fill the data Tx buffer
275 msg = &twl->xfer_msg[0];
276 msg->addr = twl->address;
277 msg->len = num_bytes + 1;
280 /* over write the first byte of buffer with the register address */
281 *value = twl4030_map[mod_no].base + reg;
282 ret = i2c_transfer(twl->client->adapter, twl->xfer_msg, 1);
283 mutex_unlock(&twl->xfer_lock);
285 /* i2cTransfer returns num messages.translate it pls.. */
290 EXPORT_SYMBOL(twl4030_i2c_write);
293 * twl4030_i2c_read - Reads a n bit register in TWL4030
294 * @mod_no: module number
295 * @value: an array of num_bytes containing data to be read
296 * @reg: register address (just offset will do)
297 * @num_bytes: number of bytes to transfer
299 * Returns result of operation - num_bytes is success else failure.
301 int twl4030_i2c_read(u8 mod_no, u8 *value, u8 reg, unsigned num_bytes)
306 struct twl4030_client *twl;
309 if (unlikely(mod_no > TWL4030_MODULE_LAST)) {
310 pr_err("%s: invalid module number %d\n", DRIVER_NAME, mod_no);
313 sid = twl4030_map[mod_no].sid;
314 twl = &twl4030_modules[sid];
316 if (unlikely(!inuse)) {
317 pr_err("%s: client %d is not initialized\n", DRIVER_NAME, sid);
320 mutex_lock(&twl->xfer_lock);
321 /* [MSG1] fill the register address data */
322 msg = &twl->xfer_msg[0];
323 msg->addr = twl->address;
325 msg->flags = 0; /* Read the register value */
326 val = twl4030_map[mod_no].base + reg;
328 /* [MSG2] fill the data rx buffer */
329 msg = &twl->xfer_msg[1];
330 msg->addr = twl->address;
331 msg->flags = I2C_M_RD; /* Read the register value */
332 msg->len = num_bytes; /* only n bytes */
334 ret = i2c_transfer(twl->client->adapter, twl->xfer_msg, 2);
335 mutex_unlock(&twl->xfer_lock);
337 /* i2cTransfer returns num messages.translate it pls.. */
342 EXPORT_SYMBOL(twl4030_i2c_read);
345 * twl4030_i2c_write_u8 - Writes a 8 bit register in TWL4030
346 * @mod_no: module number
347 * @value: the value to be written 8 bit
348 * @reg: register address (just offset will do)
350 * Returns result of operation - 0 is success
352 int twl4030_i2c_write_u8(u8 mod_no, u8 value, u8 reg)
355 /* 2 bytes offset 1 contains the data offset 0 is used by i2c_write */
356 u8 temp_buffer[2] = { 0 };
357 /* offset 1 contains the data */
358 temp_buffer[1] = value;
359 return twl4030_i2c_write(mod_no, temp_buffer, reg, 1);
361 EXPORT_SYMBOL(twl4030_i2c_write_u8);
364 * twl4030_i2c_read_u8 - Reads a 8 bit register from TWL4030
365 * @mod_no: module number
366 * @value: the value read 8 bit
367 * @reg: register address (just offset will do)
369 * Returns result of operation - 0 is success
371 int twl4030_i2c_read_u8(u8 mod_no, u8 *value, u8 reg)
373 return twl4030_i2c_read(mod_no, value, reg, 1);
375 EXPORT_SYMBOL(twl4030_i2c_read_u8);
377 /*----------------------------------------------------------------------*/
379 static struct device *
380 add_numbered_child(unsigned chip, const char *name, int num,
381 void *pdata, unsigned pdata_len,
382 bool can_wakeup, int irq0, int irq1)
384 struct platform_device *pdev;
385 struct twl4030_client *twl = &twl4030_modules[chip];
388 pdev = platform_device_alloc(name, num);
390 dev_dbg(&twl->client->dev, "can't alloc dev\n");
395 device_init_wakeup(&pdev->dev, can_wakeup);
396 pdev->dev.parent = &twl->client->dev;
399 status = platform_device_add_data(pdev, pdata, pdata_len);
401 dev_dbg(&pdev->dev, "can't add platform_data\n");
407 struct resource r[2] = {
408 { .start = irq0, .flags = IORESOURCE_IRQ, },
409 { .start = irq1, .flags = IORESOURCE_IRQ, },
412 status = platform_device_add_resources(pdev, r, irq1 ? 2 : 1);
414 dev_dbg(&pdev->dev, "can't add irqs\n");
419 status = platform_device_add(pdev);
423 platform_device_put(pdev);
424 dev_err(&twl->client->dev, "can't add %s dev\n", name);
425 return ERR_PTR(status);
430 static inline struct device *add_child(unsigned chip, const char *name,
431 void *pdata, unsigned pdata_len,
432 bool can_wakeup, int irq0, int irq1)
434 return add_numbered_child(chip, name, -1, pdata, pdata_len,
435 can_wakeup, irq0, irq1);
438 static struct device *
439 add_regulator_linked(int num, struct regulator_init_data *pdata,
440 struct regulator_consumer_supply *consumers,
441 unsigned num_consumers)
443 /* regulator framework demands init_data ... */
448 pdata->consumer_supplies = consumers;
449 pdata->num_consumer_supplies = num_consumers;
452 /* NOTE: we currently ignore regulator IRQs, e.g. for short circuits */
453 return add_numbered_child(3, "twl4030_reg", num,
454 pdata, sizeof(*pdata), false, 0, 0);
457 static struct device *
458 add_regulator(int num, struct regulator_init_data *pdata)
460 return add_regulator_linked(num, pdata, NULL, 0);
464 * NOTE: We know the first 8 IRQs after pdata->base_irq are
465 * for the PIH, and the next are for the PWR_INT SIH, since
466 * that's how twl_init_irq() sets things up.
470 add_children(struct twl4030_platform_data *pdata, unsigned long features)
472 struct device *child;
473 struct device *usb_transceiver = NULL;
475 if (twl_has_bci() && pdata->bci && !(features & TPS_SUBSET)) {
476 child = add_child(3, "twl4030_bci",
477 pdata->bci, sizeof(*pdata->bci),
479 /* irq0 = CHG_PRES, irq1 = BCI */
480 pdata->irq_base + 8 + 1, pdata->irq_base + 2);
482 return PTR_ERR(child);
485 if (twl_has_gpio() && pdata->gpio) {
486 child = add_child(1, "twl4030_gpio",
487 pdata->gpio, sizeof(*pdata->gpio),
488 false, pdata->irq_base + 0, 0);
490 return PTR_ERR(child);
493 if (twl_has_keypad() && pdata->keypad) {
494 child = add_child(2, "twl4030_keypad",
495 pdata->keypad, sizeof(*pdata->keypad),
496 true, pdata->irq_base + 1, 0);
498 return PTR_ERR(child);
501 if (twl_has_madc() && pdata->madc) {
502 child = add_child(2, "twl4030_madc",
503 pdata->madc, sizeof(*pdata->madc),
504 true, pdata->irq_base + 3, 0);
506 return PTR_ERR(child);
511 * REVISIT platform_data here currently might expose the
512 * "msecure" line ... but for now we just expect board
513 * setup to tell the chip "it's always ok to SET_TIME".
514 * Eventually, Linux might become more aware of such
515 * HW security concerns, and "least privilege".
517 child = add_child(3, "twl4030_rtc",
519 true, pdata->irq_base + 8 + 3, 0);
521 return PTR_ERR(child);
524 if (twl_has_usb() && pdata->usb) {
525 child = add_child(0, "twl4030_usb",
526 pdata->usb, sizeof(*pdata->usb),
528 /* irq0 = USB_PRES, irq1 = USB */
529 pdata->irq_base + 8 + 2, pdata->irq_base + 4);
531 return PTR_ERR(child);
533 /* we need to connect regulators to this transceiver */
534 usb_transceiver = child;
537 if (twl_has_regulator()) {
539 child = add_regulator(TWL4030_REG_VPLL1, pdata->vpll1);
541 return PTR_ERR(child);
544 child = add_regulator(TWL4030_REG_VMMC1, pdata->vmmc1);
546 return PTR_ERR(child);
548 child = add_regulator(TWL4030_REG_VDAC, pdata->vdac);
550 return PTR_ERR(child);
552 child = add_regulator((features & TWL4030_VAUX2)
553 ? TWL4030_REG_VAUX2_4030
557 return PTR_ERR(child);
560 if (twl_has_regulator() && usb_transceiver) {
561 static struct regulator_consumer_supply usb1v5 = {
564 static struct regulator_consumer_supply usb1v8 = {
567 static struct regulator_consumer_supply usb3v1 = {
571 /* this is a template that gets copied */
572 struct regulator_init_data usb_fixed = {
573 .constraints.valid_modes_mask =
574 REGULATOR_MODE_NORMAL
575 | REGULATOR_MODE_STANDBY,
576 .constraints.valid_ops_mask =
577 REGULATOR_CHANGE_MODE
578 | REGULATOR_CHANGE_STATUS,
581 usb1v5.dev = usb_transceiver;
582 usb1v8.dev = usb_transceiver;
583 usb3v1.dev = usb_transceiver;
585 child = add_regulator_linked(TWL4030_REG_VUSB1V5, &usb_fixed,
588 return PTR_ERR(child);
590 child = add_regulator_linked(TWL4030_REG_VUSB1V8, &usb_fixed,
593 return PTR_ERR(child);
595 child = add_regulator_linked(TWL4030_REG_VUSB3V1, &usb_fixed,
598 return PTR_ERR(child);
601 /* maybe add LDOs that are omitted on cost-reduced parts */
602 if (twl_has_regulator() && !(features & TPS_SUBSET)) {
604 child = add_regulator(TWL4030_REG_VPLL2, pdata->vpll2);
606 return PTR_ERR(child);
609 child = add_regulator(TWL4030_REG_VMMC2, pdata->vmmc2);
611 return PTR_ERR(child);
613 child = add_regulator(TWL4030_REG_VSIM, pdata->vsim);
615 return PTR_ERR(child);
617 child = add_regulator(TWL4030_REG_VAUX1, pdata->vaux1);
619 return PTR_ERR(child);
621 child = add_regulator(TWL4030_REG_VAUX3, pdata->vaux3);
623 return PTR_ERR(child);
625 child = add_regulator(TWL4030_REG_VAUX4, pdata->vaux4);
627 return PTR_ERR(child);
633 /*----------------------------------------------------------------------*/
636 * These three functions initialize the on-chip clock framework,
637 * letting it generate the right frequencies for USB, MADC, and
640 static inline int __init protect_pm_master(void)
644 e = twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, KEY_LOCK,
649 static inline int __init unprotect_pm_master(void)
653 e |= twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, KEY_UNLOCK1,
655 e |= twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, KEY_UNLOCK2,
660 static void __init clocks_init(void)
665 u8 ctrl = HFCLK_FREQ_26_MHZ;
667 #if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
668 if (cpu_is_omap2430())
669 osc = clk_get(NULL, "osc_ck");
671 osc = clk_get(NULL, "osc_sys_ck");
674 printk(KERN_WARNING "Skipping twl4030 internal clock init and "
675 "using bootloader value (unknown osc rate)\n");
679 rate = clk_get_rate(osc);
683 /* REVISIT for non-OMAP systems, pass the clock rate from
684 * board init code, using platform_data.
688 printk(KERN_WARNING "Skipping twl4030 internal clock init and "
689 "using bootloader value (unknown osc rate)\n");
696 ctrl = HFCLK_FREQ_19p2_MHZ;
699 ctrl = HFCLK_FREQ_26_MHZ;
702 ctrl = HFCLK_FREQ_38p4_MHZ;
706 ctrl |= HIGH_PERF_SQ;
707 e |= unprotect_pm_master();
708 /* effect->MADC+USB ck en */
709 e |= twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, ctrl, R_CFG_BOOT);
710 e |= protect_pm_master();
713 pr_err("%s: clock init err [%d]\n", DRIVER_NAME, e);
716 /*----------------------------------------------------------------------*/
718 int twl_init_irq(int irq_num, unsigned irq_base, unsigned irq_end);
719 int twl_exit_irq(void);
721 static int twl4030_remove(struct i2c_client *client)
726 status = twl_exit_irq();
730 for (i = 0; i < TWL4030_NUM_SLAVES; i++) {
731 struct twl4030_client *twl = &twl4030_modules[i];
733 if (twl->client && twl->client != client)
734 i2c_unregister_device(twl->client);
735 twl4030_modules[i].client = NULL;
741 /* NOTE: this driver only handles a single twl4030/tps659x0 chip */
743 twl4030_probe(struct i2c_client *client, const struct i2c_device_id *id)
747 struct twl4030_platform_data *pdata = client->dev.platform_data;
750 dev_dbg(&client->dev, "no platform data?\n");
754 if (i2c_check_functionality(client->adapter, I2C_FUNC_I2C) == 0) {
755 dev_dbg(&client->dev, "can't talk I2C?\n");
760 dev_dbg(&client->dev, "driver is already in use\n");
764 for (i = 0; i < TWL4030_NUM_SLAVES; i++) {
765 struct twl4030_client *twl = &twl4030_modules[i];
767 twl->address = client->addr + i;
769 twl->client = client;
771 twl->client = i2c_new_dummy(client->adapter,
774 dev_err(&twl->client->dev,
775 "can't attach client %d\n", i);
779 strlcpy(twl->client->name, id->name,
780 sizeof(twl->client->name));
782 mutex_init(&twl->xfer_lock);
786 /* setup clock framework */
789 /* load power event scripts */
790 if (twl_has_power() && pdata->power)
791 twl4030_power_init(pdata->power);
793 /* Maybe init the T2 Interrupt subsystem */
796 && pdata->irq_end > pdata->irq_base) {
797 status = twl_init_irq(client->irq, pdata->irq_base, pdata->irq_end);
802 status = add_children(pdata, id->driver_data);
805 twl4030_remove(client);
809 static const struct i2c_device_id twl4030_ids[] = {
810 { "twl4030", TWL4030_VAUX2 }, /* "Triton 2" */
811 { "twl5030", 0 }, /* T2 updated */
812 { "tps65950", 0 }, /* catalog version of twl5030 */
813 { "tps65930", TPS_SUBSET }, /* fewer LDOs and DACs; no charger */
814 { "tps65920", TPS_SUBSET }, /* fewer LDOs; no codec or charger */
815 { /* end of list */ },
817 MODULE_DEVICE_TABLE(i2c, twl4030_ids);
819 /* One Client Driver , 4 Clients */
820 static struct i2c_driver twl4030_driver = {
821 .driver.name = DRIVER_NAME,
822 .id_table = twl4030_ids,
823 .probe = twl4030_probe,
824 .remove = twl4030_remove,
827 static int __init twl4030_init(void)
829 return i2c_add_driver(&twl4030_driver);
831 subsys_initcall(twl4030_init);
833 static void __exit twl4030_exit(void)
835 i2c_del_driver(&twl4030_driver);
837 module_exit(twl4030_exit);
839 MODULE_AUTHOR("Texas Instruments, Inc.");
840 MODULE_DESCRIPTION("I2C Core interface for TWL4030");
841 MODULE_LICENSE("GPL");