drivers/mfd/twl4030-core.c

   1 /*
   2  * twl4030_core.c - driver for TWL4030/TPS659x0 PM and audio CODEC devices
   3  *
   4  * Copyright (C) 2005-2006 Texas Instruments, Inc.
   5  *
   6  * Modifications to defer interrupt handling to a kernel thread:
   7  * Copyright (C) 2006 MontaVista Software, Inc.
   8  *
   9  * Based on tlv320aic23.c:
  10  * Copyright (c) by Kai Svahn <kai.svahn@nokia.com>
  11  *
  12  * Code cleanup and modifications to IRQ handler.
  13  * by syed khasim <x0khasim@ti.com>
  14  *
  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.
  19  *
  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.
  24  *
  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
  28  */
  29
  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>
  35
  36 #include <linux/regulator/machine.h>
  37
  38 #include <linux/i2c.h>
  39 #include <linux/i2c/twl4030.h>
  40
  41
  42 /*
  43  * The TWL4030 "Triton 2" is one of a family of a multi-function "Power
  44  * Management and System Companion Device" chips originally designed for
  45  * use in OMAP2 and OMAP 3 based systems.  Its control interfaces use I2C,
  46  * often at around 3 Mbit/sec, including for interrupt handling.
  47  *
  48  * This driver core provides genirq support for the interrupts emitted,
  49  * by the various modules, and exports register access primitives.
  50  *
  51  * FIXME this driver currently requires use of the first interrupt line
  52  * (and associated registers).
  53  */
  54
  55 #define DRIVER_NAME                     "twl4030"
  56
  57 #if defined(CONFIG_TWL4030_BCI_BATTERY) || \
  58         defined(CONFIG_TWL4030_BCI_BATTERY_MODULE)
  59 #define twl_has_bci()           true
  60 #else
  61 #define twl_has_bci()           false
  62 #endif
  63
  64 #if defined(CONFIG_KEYBOARD_TWL4030) || defined(CONFIG_KEYBOARD_TWL4030_MODULE)
  65 #define twl_has_keypad()        true
  66 #else
  67 #define twl_has_keypad()        false
  68 #endif
  69
  70 #if defined(CONFIG_GPIO_TWL4030) || defined(CONFIG_GPIO_TWL4030_MODULE)
  71 #define twl_has_gpio()  true
  72 #else
  73 #define twl_has_gpio()  false
  74 #endif
  75
  76 #if defined(CONFIG_REGULATOR_TWL4030) \
  77         || defined(CONFIG_REGULATOR_TWL4030_MODULE)
  78 #define twl_has_regulator()     true
  79 #else
  80 #define twl_has_regulator()     false
  81 #endif
  82
  83 #if defined(CONFIG_TWL4030_MADC) || defined(CONFIG_TWL4030_MADC_MODULE)
  84 #define twl_has_madc()  true
  85 #else
  86 #define twl_has_madc()  false
  87 #endif
  88
  89 #if defined(CONFIG_RTC_DRV_TWL4030) || defined(CONFIG_RTC_DRV_TWL4030_MODULE)
  90 #define twl_has_rtc()   true
  91 #else
  92 #define twl_has_rtc()   false
  93 #endif
  94
  95 #if defined(CONFIG_TWL4030_USB) || defined(CONFIG_TWL4030_USB_MODULE)
  96 #define twl_has_usb()   true
  97 #else
  98 #define twl_has_usb()   false
  99 #endif
 100
 101
 102 /* Triton Core internal information (BEGIN) */
 103
 104 /* Last - for index max*/
 105 #define TWL4030_MODULE_LAST             TWL4030_MODULE_SECURED_REG
 106
 107 #define TWL4030_NUM_SLAVES              4
 108
 109
 110 /* Base Address defns for twl4030_map[] */
 111
 112 /* subchip/slave 0 - USB ID */
 113 #define TWL4030_BASEADD_USB             0x0000
 114
 115 /* subchip/slave 1 - AUD ID */
 116 #define TWL4030_BASEADD_AUDIO_VOICE     0x0000
 117 #define TWL4030_BASEADD_GPIO            0x0098
 118 #define TWL4030_BASEADD_INTBR           0x0085
 119 #define TWL4030_BASEADD_PIH             0x0080
 120 #define TWL4030_BASEADD_TEST            0x004C
 121
 122 /* subchip/slave 2 - AUX ID */
 123 #define TWL4030_BASEADD_INTERRUPTS      0x00B9
 124 #define TWL4030_BASEADD_LED             0x00EE
 125 #define TWL4030_BASEADD_MADC            0x0000
 126 #define TWL4030_BASEADD_MAIN_CHARGE     0x0074
 127 #define TWL4030_BASEADD_PRECHARGE       0x00AA
 128 #define TWL4030_BASEADD_PWM0            0x00F8
 129 #define TWL4030_BASEADD_PWM1            0x00FB
 130 #define TWL4030_BASEADD_PWMA            0x00EF
 131 #define TWL4030_BASEADD_PWMB            0x00F1
 132 #define TWL4030_BASEADD_KEYPAD          0x00D2
 133
 134 /* subchip/slave 3 - POWER ID */
 135 #define TWL4030_BASEADD_BACKUP          0x0014
 136 #define TWL4030_BASEADD_INT             0x002E
 137 #define TWL4030_BASEADD_PM_MASTER       0x0036
 138 #define TWL4030_BASEADD_PM_RECEIVER     0x005B
 139 #define TWL4030_BASEADD_RTC             0x001C
 140 #define TWL4030_BASEADD_SECURED_REG     0x0000
 141
 142 /* Triton Core internal information (END) */
 143
 144
 145 /* Few power values */
 146 #define R_CFG_BOOT                      0x05
 147 #define R_PROTECT_KEY                   0x0E
 148
 149 /* access control values for R_PROTECT_KEY */
 150 #define KEY_UNLOCK1                     0xce
 151 #define KEY_UNLOCK2                     0xec
 152 #define KEY_LOCK                        0x00
 153
 154 /* some fields in R_CFG_BOOT */
 155 #define HFCLK_FREQ_19p2_MHZ             (1 << 0)
 156 #define HFCLK_FREQ_26_MHZ               (2 << 0)
 157 #define HFCLK_FREQ_38p4_MHZ             (3 << 0)
 158 #define HIGH_PERF_SQ                    (1 << 3)
 159
 160
 161 /* chip-specific feature flags, for i2c_device_id.driver_data */
 162 #define TWL4030_VAUX2           BIT(0)  /* pre-5030 voltage ranges */
 163 #define TPS_SUBSET              BIT(1)  /* tps659[23]0 have fewer LDOs */
 164
 165 /*----------------------------------------------------------------------*/
 166
 167 /* is driver active, bound to a chip? */
 168 static bool inuse;
 169
 170 /* Structure for each TWL4030 Slave */
 171 struct twl4030_client {
 172         struct i2c_client *client;
 173         u8 address;
 174
 175         /* max numb of i2c_msg required is for read =2 */
 176         struct i2c_msg xfer_msg[2];
 177
 178         /* To lock access to xfer_msg */
 179         struct mutex xfer_lock;
 180 };
 181
 182 static struct twl4030_client twl4030_modules[TWL4030_NUM_SLAVES];
 183
 184
 185 /* mapping the module id to slave id and base address */
 186 struct twl4030mapping {
 187         unsigned char sid;      /* Slave ID */
 188         unsigned char base;     /* base address */
 189 };
 190
 191 static struct twl4030mapping twl4030_map[TWL4030_MODULE_LAST + 1] = {
 192         /*
 193          * NOTE:  don't change this table without updating the
 194          * <linux/i2c/twl4030.h> defines for TWL4030_MODULE_*
 195          * so they continue to match the order in this table.
 196          */
 197
 198         { 0, TWL4030_BASEADD_USB },
 199
 200         { 1, TWL4030_BASEADD_AUDIO_VOICE },
 201         { 1, TWL4030_BASEADD_GPIO },
 202         { 1, TWL4030_BASEADD_INTBR },
 203         { 1, TWL4030_BASEADD_PIH },
 204         { 1, TWL4030_BASEADD_TEST },
 205
 206         { 2, TWL4030_BASEADD_KEYPAD },
 207         { 2, TWL4030_BASEADD_MADC },
 208         { 2, TWL4030_BASEADD_INTERRUPTS },
 209         { 2, TWL4030_BASEADD_LED },
 210         { 2, TWL4030_BASEADD_MAIN_CHARGE },
 211         { 2, TWL4030_BASEADD_PRECHARGE },
 212         { 2, TWL4030_BASEADD_PWM0 },
 213         { 2, TWL4030_BASEADD_PWM1 },
 214         { 2, TWL4030_BASEADD_PWMA },
 215         { 2, TWL4030_BASEADD_PWMB },
 216
 217         { 3, TWL4030_BASEADD_BACKUP },
 218         { 3, TWL4030_BASEADD_INT },
 219         { 3, TWL4030_BASEADD_PM_MASTER },
 220         { 3, TWL4030_BASEADD_PM_RECEIVER },
 221         { 3, TWL4030_BASEADD_RTC },
 222         { 3, TWL4030_BASEADD_SECURED_REG },
 223 };
 224
 225 /*----------------------------------------------------------------------*/
 226
 227 /* Exported Functions */
 228
 229 /**
 230  * twl4030_i2c_write - Writes a n bit register in TWL4030
 231  * @mod_no: module number
 232  * @value: an array of num_bytes+1 containing data to write
 233  * @reg: register address (just offset will do)
 234  * @num_bytes: number of bytes to transfer
 235  *
 236  * IMPORTANT: for 'value' parameter: Allocate value num_bytes+1 and
 237  * valid data starts at Offset 1.
 238  *
 239  * Returns the result of operation - 0 is success
 240  */
 241 int twl4030_i2c_write(u8 mod_no, u8 *value, u8 reg, unsigned num_bytes)
 242 {
 243         int ret;
 244         int sid;
 245         struct twl4030_client *twl;
 246         struct i2c_msg *msg;
 247
 248         if (unlikely(mod_no > TWL4030_MODULE_LAST)) {
 249                 pr_err("%s: invalid module number %d\n", DRIVER_NAME, mod_no);
 250                 return -EPERM;
 251         }
 252         sid = twl4030_map[mod_no].sid;
 253         twl = &twl4030_modules[sid];
 254
 255         if (unlikely(!inuse)) {
 256                 pr_err("%s: client %d is not initialized\n", DRIVER_NAME, sid);
 257                 return -EPERM;
 258         }
 259         mutex_lock(&twl->xfer_lock);
 260         /*
 261          * [MSG1]: fill the register address data
 262          * fill the data Tx buffer
 263          */
 264         msg = &twl->xfer_msg[0];
 265         msg->addr = twl->address;
 266         msg->len = num_bytes + 1;
 267         msg->flags = 0;
 268         msg->buf = value;
 269         /* over write the first byte of buffer with the register address */
 270         *value = twl4030_map[mod_no].base + reg;
 271         ret = i2c_transfer(twl->client->adapter, twl->xfer_msg, 1);
 272         mutex_unlock(&twl->xfer_lock);
 273
 274         /* i2cTransfer returns num messages.translate it pls.. */
 275         if (ret >= 0)
 276                 ret = 0;
 277         return ret;
 278 }
 279 EXPORT_SYMBOL(twl4030_i2c_write);
 280
 281 /**
 282  * twl4030_i2c_read - Reads a n bit register in TWL4030
 283  * @mod_no: module number
 284  * @value: an array of num_bytes containing data to be read
 285  * @reg: register address (just offset will do)
 286  * @num_bytes: number of bytes to transfer
 287  *
 288  * Returns result of operation - num_bytes is success else failure.
 289  */
 290 int twl4030_i2c_read(u8 mod_no, u8 *value, u8 reg, unsigned num_bytes)
 291 {
 292         int ret;
 293         u8 val;
 294         int sid;
 295         struct twl4030_client *twl;
 296         struct i2c_msg *msg;
 297
 298         if (unlikely(mod_no > TWL4030_MODULE_LAST)) {
 299                 pr_err("%s: invalid module number %d\n", DRIVER_NAME, mod_no);
 300                 return -EPERM;
 301         }
 302         sid = twl4030_map[mod_no].sid;
 303         twl = &twl4030_modules[sid];
 304
 305         if (unlikely(!inuse)) {
 306                 pr_err("%s: client %d is not initialized\n", DRIVER_NAME, sid);
 307                 return -EPERM;
 308         }
 309         mutex_lock(&twl->xfer_lock);
 310         /* [MSG1] fill the register address data */
 311         msg = &twl->xfer_msg[0];
 312         msg->addr = twl->address;
 313         msg->len = 1;
 314         msg->flags = 0; /* Read the register value */
 315         val = twl4030_map[mod_no].base + reg;
 316         msg->buf = &val;
 317         /* [MSG2] fill the data rx buffer */
 318         msg = &twl->xfer_msg[1];
 319         msg->addr = twl->address;
 320         msg->flags = I2C_M_RD;  /* Read the register value */
 321         msg->len = num_bytes;   /* only n bytes */
 322         msg->buf = value;
 323         ret = i2c_transfer(twl->client->adapter, twl->xfer_msg, 2);
 324         mutex_unlock(&twl->xfer_lock);
 325
 326         /* i2cTransfer returns num messages.translate it pls.. */
 327         if (ret >= 0)
 328                 ret = 0;
 329         return ret;
 330 }
 331 EXPORT_SYMBOL(twl4030_i2c_read);
 332
 333 /**
 334  * twl4030_i2c_write_u8 - Writes a 8 bit register in TWL4030
 335  * @mod_no: module number
 336  * @value: the value to be written 8 bit
 337  * @reg: register address (just offset will do)
 338  *
 339  * Returns result of operation - 0 is success
 340  */
 341 int twl4030_i2c_write_u8(u8 mod_no, u8 value, u8 reg)
 342 {
 343
 344         /* 2 bytes offset 1 contains the data offset 0 is used by i2c_write */
 345         u8 temp_buffer[2] = { 0 };
 346         /* offset 1 contains the data */
 347         temp_buffer[1] = value;
 348         return twl4030_i2c_write(mod_no, temp_buffer, reg, 1);
 349 }
 350 EXPORT_SYMBOL(twl4030_i2c_write_u8);
 351
 352 /**
 353  * twl4030_i2c_read_u8 - Reads a 8 bit register from TWL4030
 354  * @mod_no: module number
 355  * @value: the value read 8 bit
 356  * @reg: register address (just offset will do)
 357  *
 358  * Returns result of operation - 0 is success
 359  */
 360 int twl4030_i2c_read_u8(u8 mod_no, u8 *value, u8 reg)
 361 {
 362         return twl4030_i2c_read(mod_no, value, reg, 1);
 363 }
 364 EXPORT_SYMBOL(twl4030_i2c_read_u8);
 365
 366 /*----------------------------------------------------------------------*/
 367
 368 static struct device *
 369 add_numbered_child(unsigned chip, const char *name, int num,
 370                 void *pdata, unsigned pdata_len,
 371                 bool can_wakeup, int irq0, int irq1)
 372 {
 373         struct platform_device  *pdev;
 374         struct twl4030_client   *twl = &twl4030_modules[chip];
 375         int                     status;
 376
 377         pdev = platform_device_alloc(name, num);
 378         if (!pdev) {
 379                 dev_dbg(&twl->client->dev, "can't alloc dev\n");
 380                 status = -ENOMEM;
 381                 goto err;
 382         }
 383
 384         device_init_wakeup(&pdev->dev, can_wakeup);
 385         pdev->dev.parent = &twl->client->dev;
 386
 387         if (pdata) {
 388                 status = platform_device_add_data(pdev, pdata, pdata_len);
 389                 if (status < 0) {
 390                         dev_dbg(&pdev->dev, "can't add platform_data\n");
 391                         goto err;
 392                 }
 393         }
 394
 395         if (irq0) {
 396                 struct resource r[2] = {
 397                         { .start = irq0, .flags = IORESOURCE_IRQ, },
 398                         { .start = irq1, .flags = IORESOURCE_IRQ, },
 399                 };
 400
 401                 status = platform_device_add_resources(pdev, r, irq1 ? 2 : 1);
 402                 if (status < 0) {
 403                         dev_dbg(&pdev->dev, "can't add irqs\n");
 404                         goto err;
 405                 }
 406         }
 407
 408         status = platform_device_add(pdev);
 409
 410 err:
 411         if (status < 0) {
 412                 platform_device_put(pdev);
 413                 dev_err(&twl->client->dev, "can't add %s dev\n", name);
 414                 return ERR_PTR(status);
 415         }
 416         return &pdev->dev;
 417 }
 418
 419 static inline struct device *add_child(unsigned chip, const char *name,
 420                 void *pdata, unsigned pdata_len,
 421                 bool can_wakeup, int irq0, int irq1)
 422 {
 423         return add_numbered_child(chip, name, -1, pdata, pdata_len,
 424                 can_wakeup, irq0, irq1);
 425 }
 426
 427 static struct device *
 428 add_regulator_linked(int num, struct regulator_init_data *pdata,
 429                 struct regulator_consumer_supply *consumers,
 430                 unsigned num_consumers)
 431 {
 432         /* regulator framework demands init_data ... */
 433         if (!pdata)
 434                 return NULL;
 435
 436         if (consumers) {
 437                 pdata->consumer_supplies = consumers;
 438                 pdata->num_consumer_supplies = num_consumers;
 439         }
 440
 441         /* NOTE:  we currently ignore regulator IRQs, e.g. for short circuits */
 442         return add_numbered_child(3, "twl4030_reg", num,
 443                 pdata, sizeof(*pdata), false, 0, 0);
 444 }
 445
 446 static struct device *
 447 add_regulator(int num, struct regulator_init_data *pdata)
 448 {
 449         return add_regulator_linked(num, pdata, NULL, 0);
 450 }
 451
 452 /*
 453  * NOTE:  We know the first 8 IRQs after pdata->base_irq are
 454  * for the PIH, and the next are for the PWR_INT SIH, since
 455  * that's how twl_init_irq() sets things up.
 456  */
 457
 458 static int
 459 add_children(struct twl4030_platform_data *pdata, unsigned long features)
 460 {
 461         struct device   *child;
 462         struct device   *usb_transceiver = NULL;
 463
 464         if (twl_has_bci() && pdata->bci && !(features & TPS_SUBSET)) {
 465                 child = add_child(3, "twl4030_bci",
 466                                 pdata->bci, sizeof(*pdata->bci),
 467                                 false,
 468                                 /* irq0 = CHG_PRES, irq1 = BCI */
 469                                 pdata->irq_base + 8 + 1, pdata->irq_base + 2);
 470                 if (IS_ERR(child))
 471                         return PTR_ERR(child);
 472         }
 473
 474         if (twl_has_gpio() && pdata->gpio) {
 475                 child = add_child(1, "twl4030_gpio",
 476                                 pdata->gpio, sizeof(*pdata->gpio),
 477                                 false, pdata->irq_base + 0, 0);
 478                 if (IS_ERR(child))
 479                         return PTR_ERR(child);
 480         }
 481
 482         if (twl_has_keypad() && pdata->keypad) {
 483                 child = add_child(2, "twl4030_keypad",
 484                                 pdata->keypad, sizeof(*pdata->keypad),
 485                                 true, pdata->irq_base + 1, 0);
 486                 if (IS_ERR(child))
 487                         return PTR_ERR(child);
 488         }
 489
 490         if (twl_has_madc() && pdata->madc) {
 491                 child = add_child(2, "twl4030_madc",
 492                                 pdata->madc, sizeof(*pdata->madc),
 493                                 true, pdata->irq_base + 3, 0);
 494                 if (IS_ERR(child))
 495                         return PTR_ERR(child);
 496         }
 497
 498         if (twl_has_rtc()) {
 499                 /*
 500                  * REVISIT platform_data here currently might expose the
 501                  * "msecure" line ... but for now we just expect board
 502                  * setup to tell the chip "it's always ok to SET_TIME".
 503                  * Eventually, Linux might become more aware of such
 504                  * HW security concerns, and "least privilege".
 505                  */
 506                 child = add_child(3, "twl4030_rtc",
 507                                 NULL, 0,
 508                                 true, pdata->irq_base + 8 + 3, 0);
 509                 if (IS_ERR(child))
 510                         return PTR_ERR(child);
 511         }
 512
 513         if (twl_has_usb() && pdata->usb) {
 514                 child = add_child(0, "twl4030_usb",
 515                                 pdata->usb, sizeof(*pdata->usb),
 516                                 true,
 517                                 /* irq0 = USB_PRES, irq1 = USB */
 518                                 pdata->irq_base + 8 + 2, pdata->irq_base + 4);
 519                 if (IS_ERR(child))
 520                         return PTR_ERR(child);
 521
 522                 /* we need to connect regulators to this transceiver */
 523                 usb_transceiver = child;
 524         }
 525
 526         if (twl_has_regulator()) {
 527                 /*
 528                 child = add_regulator(TWL4030_REG_VPLL1, pdata->vpll1);
 529                 if (IS_ERR(child))
 530                         return PTR_ERR(child);
 531                 */
 532
 533                 child = add_regulator(TWL4030_REG_VMMC1, pdata->vmmc1);
 534                 if (IS_ERR(child))
 535                         return PTR_ERR(child);
 536
 537                 child = add_regulator(TWL4030_REG_VDAC, pdata->vdac);
 538                 if (IS_ERR(child))
 539                         return PTR_ERR(child);
 540
 541                 child = add_regulator((features & TWL4030_VAUX2)
 542                                         ? TWL4030_REG_VAUX2_4030
 543                                         : TWL4030_REG_VAUX2,
 544                                 pdata->vaux2);
 545                 if (IS_ERR(child))
 546                         return PTR_ERR(child);
 547         }
 548
 549         if (twl_has_regulator() && usb_transceiver) {
 550                 static struct regulator_consumer_supply usb1v5 = {
 551                         .supply =       "usb1v5",
 552                 };
 553                 static struct regulator_consumer_supply usb1v8 = {
 554                         .supply =       "usb1v8",
 555                 };
 556                 static struct regulator_consumer_supply usb3v1 = {
 557                         .supply =       "usb3v1",
 558                 };
 559
 560                 /* this is a template that gets copied */
 561                 struct regulator_init_data usb_fixed = {
 562                         .constraints.valid_modes_mask =
 563                                   REGULATOR_MODE_NORMAL
 564                                 | REGULATOR_MODE_STANDBY,
 565                         .constraints.valid_ops_mask =
 566                                   REGULATOR_CHANGE_MODE
 567                                 | REGULATOR_CHANGE_STATUS,
 568                 };
 569
 570                 usb1v5.dev = usb_transceiver;
 571                 usb1v8.dev = usb_transceiver;
 572                 usb3v1.dev = usb_transceiver;
 573
 574                 child = add_regulator_linked(TWL4030_REG_VUSB1V5, &usb_fixed,
 575                                 &usb1v5, 1);
 576                 if (IS_ERR(child))
 577                         return PTR_ERR(child);
 578
 579                 child = add_regulator_linked(TWL4030_REG_VUSB1V8, &usb_fixed,
 580                                 &usb1v8, 1);
 581                 if (IS_ERR(child))
 582                         return PTR_ERR(child);
 583
 584                 child = add_regulator_linked(TWL4030_REG_VUSB3V1, &usb_fixed,
 585                                 &usb3v1, 1);
 586                 if (IS_ERR(child))
 587                         return PTR_ERR(child);
 588         }
 589
 590         /* maybe add LDOs that are omitted on cost-reduced parts */
 591         if (twl_has_regulator() && !(features & TPS_SUBSET)) {
 592                 /*
 593                 child = add_regulator(TWL4030_REG_VPLL2, pdata->vpll2);
 594                 if (IS_ERR(child))
 595                         return PTR_ERR(child);
 596                 */
 597
 598                 child = add_regulator(TWL4030_REG_VMMC2, pdata->vmmc2);
 599                 if (IS_ERR(child))
 600                         return PTR_ERR(child);
 601
 602                 child = add_regulator(TWL4030_REG_VSIM, pdata->vsim);
 603                 if (IS_ERR(child))
 604                         return PTR_ERR(child);
 605
 606                 child = add_regulator(TWL4030_REG_VAUX1, pdata->vaux1);
 607                 if (IS_ERR(child))
 608                         return PTR_ERR(child);
 609
 610                 child = add_regulator(TWL4030_REG_VAUX3, pdata->vaux3);
 611                 if (IS_ERR(child))
 612                         return PTR_ERR(child);
 613
 614                 child = add_regulator(TWL4030_REG_VAUX4, pdata->vaux4);
 615                 if (IS_ERR(child))
 616                         return PTR_ERR(child);
 617         }
 618
 619         return 0;
 620 }
 621
 622 /*----------------------------------------------------------------------*/
 623
 624 /*
 625  * These three functions initialize the on-chip clock framework,
 626  * letting it generate the right frequencies for USB, MADC, and
 627  * other purposes.
 628  */
 629 static inline int __init protect_pm_master(void)
 630 {
 631         int e = 0;
 632
 633         e = twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, KEY_LOCK,
 634                         R_PROTECT_KEY);
 635         return e;
 636 }
 637
 638 static inline int __init unprotect_pm_master(void)
 639 {
 640         int e = 0;
 641
 642         e |= twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, KEY_UNLOCK1,
 643                         R_PROTECT_KEY);
 644         e |= twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, KEY_UNLOCK2,
 645                         R_PROTECT_KEY);
 646         return e;
 647 }
 648
 649 static void __init clocks_init(void)
 650 {
 651         int e = 0;
 652         struct clk *osc;
 653         u32 rate;
 654         u8 ctrl = HFCLK_FREQ_26_MHZ;
 655
 656 #if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
 657         if (cpu_is_omap2430())
 658                 osc = clk_get(NULL, "osc_ck");
 659         else
 660                 osc = clk_get(NULL, "osc_sys_ck");
 661
 662         if (IS_ERR(osc)) {
 663                 printk(KERN_WARNING "Skipping twl4030 internal clock init and "
 664                                 "using bootloader value (unknown osc rate)\n");
 665                 return;
 666         }
 667
 668         rate = clk_get_rate(osc);
 669         clk_put(osc);
 670
 671 #else
 672         /* REVISIT for non-OMAP systems, pass the clock rate from
 673          * board init code, using platform_data.
 674          */
 675         osc = ERR_PTR(-EIO);
 676
 677         printk(KERN_WARNING "Skipping twl4030 internal clock init and "
 678                "using bootloader value (unknown osc rate)\n");
 679
 680         return;
 681 #endif
 682
 683         switch (rate) {
 684         case 19200000:
 685                 ctrl = HFCLK_FREQ_19p2_MHZ;
 686                 break;
 687         case 26000000:
 688                 ctrl = HFCLK_FREQ_26_MHZ;
 689                 break;
 690         case 38400000:
 691                 ctrl = HFCLK_FREQ_38p4_MHZ;
 692                 break;
 693         }
 694
 695         ctrl |= HIGH_PERF_SQ;
 696         e |= unprotect_pm_master();
 697         /* effect->MADC+USB ck en */
 698         e |= twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, ctrl, R_CFG_BOOT);
 699         e |= protect_pm_master();
 700
 701         if (e < 0)
 702                 pr_err("%s: clock init err [%d]\n", DRIVER_NAME, e);
 703 }
 704
 705 /*----------------------------------------------------------------------*/
 706
 707 int twl_init_irq(int irq_num, unsigned irq_base, unsigned irq_end);
 708 int twl_exit_irq(void);
 709
 710 static int twl4030_remove(struct i2c_client *client)
 711 {
 712         unsigned i;
 713         int status;
 714
 715         status = twl_exit_irq();
 716         if (status < 0)
 717                 return status;
 718
 719         for (i = 0; i < TWL4030_NUM_SLAVES; i++) {
 720                 struct twl4030_client   *twl = &twl4030_modules[i];
 721
 722                 if (twl->client && twl->client != client)
 723                         i2c_unregister_device(twl->client);
 724                 twl4030_modules[i].client = NULL;
 725         }
 726         inuse = false;
 727         return 0;
 728 }
 729
 730 /* NOTE:  this driver only handles a single twl4030/tps659x0 chip */
 731 static int
 732 twl4030_probe(struct i2c_client *client, const struct i2c_device_id *id)
 733 {
 734         int                             status;
 735         unsigned                        i;
 736         struct twl4030_platform_data    *pdata = client->dev.platform_data;
 737
 738         if (!pdata) {
 739                 dev_dbg(&client->dev, "no platform data?\n");
 740                 return -EINVAL;
 741         }
 742
 743         if (i2c_check_functionality(client->adapter, I2C_FUNC_I2C) == 0) {
 744                 dev_dbg(&client->dev, "can't talk I2C?\n");
 745                 return -EIO;
 746         }
 747
 748         if (inuse) {
 749                 dev_dbg(&client->dev, "driver is already in use\n");
 750                 return -EBUSY;
 751         }
 752
 753         for (i = 0; i < TWL4030_NUM_SLAVES; i++) {
 754                 struct twl4030_client   *twl = &twl4030_modules[i];
 755
 756                 twl->address = client->addr + i;
 757                 if (i == 0)
 758                         twl->client = client;
 759                 else {
 760                         twl->client = i2c_new_dummy(client->adapter,
 761                                         twl->address);
 762                         if (!twl->client) {
 763                                 dev_err(&twl->client->dev,
 764                                         "can't attach client %d\n", i);
 765                                 status = -ENOMEM;
 766                                 goto fail;
 767                         }
 768                         strlcpy(twl->client->name, id->name,
 769                                         sizeof(twl->client->name));
 770                 }
 771                 mutex_init(&twl->xfer_lock);
 772         }
 773         inuse = true;
 774
 775         /* setup clock framework */
 776         clocks_init();
 777
 778         /* Maybe init the T2 Interrupt subsystem */
 779         if (client->irq
 780                         && pdata->irq_base
 781                         && pdata->irq_end > pdata->irq_base) {
 782                 status = twl_init_irq(client->irq, pdata->irq_base, pdata->irq_end);
 783                 if (status < 0)
 784                         goto fail;
 785         }
 786
 787         status = add_children(pdata, id->driver_data);
 788 fail:
 789         if (status < 0)
 790                 twl4030_remove(client);
 791         return status;
 792 }
 793
 794 static const struct i2c_device_id twl4030_ids[] = {
 795         { "twl4030", TWL4030_VAUX2 },   /* "Triton 2" */
 796         { "twl5030", 0 },               /* T2 updated */
 797         { "tps65950", 0 },              /* catalog version of twl5030 */
 798         { "tps65930", TPS_SUBSET },     /* fewer LDOs and DACs; no charger */
 799         { "tps65920", TPS_SUBSET },     /* fewer LDOs; no codec or charger */
 800         { /* end of list */ },
 801 };
 802 MODULE_DEVICE_TABLE(i2c, twl4030_ids);
 803
 804 /* One Client Driver , 4 Clients */
 805 static struct i2c_driver twl4030_driver = {
 806         .driver.name    = DRIVER_NAME,
 807         .id_table       = twl4030_ids,
 808         .probe          = twl4030_probe,
 809         .remove         = twl4030_remove,
 810 };
 811
 812 static int __init twl4030_init(void)
 813 {
 814         return i2c_add_driver(&twl4030_driver);
 815 }
 816 subsys_initcall(twl4030_init);
 817
 818 static void __exit twl4030_exit(void)
 819 {
 820         i2c_del_driver(&twl4030_driver);
 821 }
 822 module_exit(twl4030_exit);
 823
 824 MODULE_AUTHOR("Texas Instruments, Inc.");
 825 MODULE_DESCRIPTION("I2C Core interface for TWL4030");
 826 MODULE_LICENSE("GPL");