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