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 #if defined(CONFIG_TWL4030_WATCHDOG) || \
 105         defined(CONFIG_TWL4030_WATCHDOG_MODULE)
 106 #define twl_has_watchdog()        true
 107 #else
 108 #define twl_has_watchdog()        false
 109 #endif
 110
 111 /* Triton Core internal information (BEGIN) */
 112
 113 /* Last - for index max*/
 114 #define TWL4030_MODULE_LAST             TWL4030_MODULE_SECURED_REG
 115
 116 #define TWL4030_NUM_SLAVES              4
 117
 118
 119 /* Base Address defns for twl4030_map[] */
 120
 121 /* subchip/slave 0 - USB ID */
 122 #define TWL4030_BASEADD_USB             0x0000
 123
 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
 130
 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
 142
 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
 150
 151 /* Triton Core internal information (END) */
 152
 153
 154 /* Few power values */
 155 #define R_CFG_BOOT                      0x05
 156 #define R_PROTECT_KEY                   0x0E
 157
 158 /* access control values for R_PROTECT_KEY */
 159 #define KEY_UNLOCK1                     0xce
 160 #define KEY_UNLOCK2                     0xec
 161 #define KEY_LOCK                        0x00
 162
 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)
 168
 169
 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 */
 173
 174 /*----------------------------------------------------------------------*/
 175
 176 /* is driver active, bound to a chip? */
 177 static bool inuse;
 178
 179 /* Structure for each TWL4030 Slave */
 180 struct twl4030_client {
 181         struct i2c_client *client;
 182         u8 address;
 183
 184         /* max numb of i2c_msg required is for read =2 */
 185         struct i2c_msg xfer_msg[2];
 186
 187         /* To lock access to xfer_msg */
 188         struct mutex xfer_lock;
 189 };
 190
 191 static struct twl4030_client twl4030_modules[TWL4030_NUM_SLAVES];
 192
 193
 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 */
 198 };
 199
 200 static struct twl4030mapping twl4030_map[TWL4030_MODULE_LAST + 1] = {
 201         /*
 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.
 205          */
 206
 207         { 0, TWL4030_BASEADD_USB },
 208
 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 },
 214
 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 },
 225
 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 },
 232 };
 233
 234 /*----------------------------------------------------------------------*/
 235
 236 /* Exported Functions */
 237
 238 /**
 239  * twl4030_i2c_write - Writes a n bit register in TWL4030
 240  * @mod_no: module number
 241  * @value: an array of num_bytes+1 containing data to write
 242  * @reg: register address (just offset will do)
 243  * @num_bytes: number of bytes to transfer
 244  *
 245  * IMPORTANT: for 'value' parameter: Allocate value num_bytes+1 and
 246  * valid data starts at Offset 1.
 247  *
 248  * Returns the result of operation - 0 is success
 249  */
 250 int twl4030_i2c_write(u8 mod_no, u8 *value, u8 reg, unsigned num_bytes)
 251 {
 252         int ret;
 253         int sid;
 254         struct twl4030_client *twl;
 255         struct i2c_msg *msg;
 256
 257         if (unlikely(mod_no > TWL4030_MODULE_LAST)) {
 258                 pr_err("%s: invalid module number %d\n", DRIVER_NAME, mod_no);
 259                 return -EPERM;
 260         }
 261         sid = twl4030_map[mod_no].sid;
 262         twl = &twl4030_modules[sid];
 263
 264         if (unlikely(!inuse)) {
 265                 pr_err("%s: client %d is not initialized\n", DRIVER_NAME, sid);
 266                 return -EPERM;
 267         }
 268         mutex_lock(&twl->xfer_lock);
 269         /*
 270          * [MSG1]: fill the register address data
 271          * fill the data Tx buffer
 272          */
 273         msg = &twl->xfer_msg[0];
 274         msg->addr = twl->address;
 275         msg->len = num_bytes + 1;
 276         msg->flags = 0;
 277         msg->buf = value;
 278         /* over write the first byte of buffer with the register address */
 279         *value = twl4030_map[mod_no].base + reg;
 280         ret = i2c_transfer(twl->client->adapter, twl->xfer_msg, 1);
 281         mutex_unlock(&twl->xfer_lock);
 282
 283         /* i2cTransfer returns num messages.translate it pls.. */
 284         if (ret >= 0)
 285                 ret = 0;
 286         return ret;
 287 }
 288 EXPORT_SYMBOL(twl4030_i2c_write);
 289
 290 /**
 291  * twl4030_i2c_read - Reads a n bit register in TWL4030
 292  * @mod_no: module number
 293  * @value: an array of num_bytes containing data to be read
 294  * @reg: register address (just offset will do)
 295  * @num_bytes: number of bytes to transfer
 296  *
 297  * Returns result of operation - num_bytes is success else failure.
 298  */
 299 int twl4030_i2c_read(u8 mod_no, u8 *value, u8 reg, unsigned num_bytes)
 300 {
 301         int ret;
 302         u8 val;
 303         int sid;
 304         struct twl4030_client *twl;
 305         struct i2c_msg *msg;
 306
 307         if (unlikely(mod_no > TWL4030_MODULE_LAST)) {
 308                 pr_err("%s: invalid module number %d\n", DRIVER_NAME, mod_no);
 309                 return -EPERM;
 310         }
 311         sid = twl4030_map[mod_no].sid;
 312         twl = &twl4030_modules[sid];
 313
 314         if (unlikely(!inuse)) {
 315                 pr_err("%s: client %d is not initialized\n", DRIVER_NAME, sid);
 316                 return -EPERM;
 317         }
 318         mutex_lock(&twl->xfer_lock);
 319         /* [MSG1] fill the register address data */
 320         msg = &twl->xfer_msg[0];
 321         msg->addr = twl->address;
 322         msg->len = 1;
 323         msg->flags = 0; /* Read the register value */
 324         val = twl4030_map[mod_no].base + reg;
 325         msg->buf = &val;
 326         /* [MSG2] fill the data rx buffer */
 327         msg = &twl->xfer_msg[1];
 328         msg->addr = twl->address;
 329         msg->flags = I2C_M_RD;  /* Read the register value */
 330         msg->len = num_bytes;   /* only n bytes */
 331         msg->buf = value;
 332         ret = i2c_transfer(twl->client->adapter, twl->xfer_msg, 2);
 333         mutex_unlock(&twl->xfer_lock);
 334
 335         /* i2cTransfer returns num messages.translate it pls.. */
 336         if (ret >= 0)
 337                 ret = 0;
 338         return ret;
 339 }
 340 EXPORT_SYMBOL(twl4030_i2c_read);
 341
 342 /**
 343  * twl4030_i2c_write_u8 - Writes a 8 bit register in TWL4030
 344  * @mod_no: module number
 345  * @value: the value to be written 8 bit
 346  * @reg: register address (just offset will do)
 347  *
 348  * Returns result of operation - 0 is success
 349  */
 350 int twl4030_i2c_write_u8(u8 mod_no, u8 value, u8 reg)
 351 {
 352
 353         /* 2 bytes offset 1 contains the data offset 0 is used by i2c_write */
 354         u8 temp_buffer[2] = { 0 };
 355         /* offset 1 contains the data */
 356         temp_buffer[1] = value;
 357         return twl4030_i2c_write(mod_no, temp_buffer, reg, 1);
 358 }
 359 EXPORT_SYMBOL(twl4030_i2c_write_u8);
 360
 361 /**
 362  * twl4030_i2c_read_u8 - Reads a 8 bit register from TWL4030
 363  * @mod_no: module number
 364  * @value: the value read 8 bit
 365  * @reg: register address (just offset will do)
 366  *
 367  * Returns result of operation - 0 is success
 368  */
 369 int twl4030_i2c_read_u8(u8 mod_no, u8 *value, u8 reg)
 370 {
 371         return twl4030_i2c_read(mod_no, value, reg, 1);
 372 }
 373 EXPORT_SYMBOL(twl4030_i2c_read_u8);
 374
 375 /*----------------------------------------------------------------------*/
 376
 377 static struct device *
 378 add_numbered_child(unsigned chip, const char *name, int num,
 379                 void *pdata, unsigned pdata_len,
 380                 bool can_wakeup, int irq0, int irq1)
 381 {
 382         struct platform_device  *pdev;
 383         struct twl4030_client   *twl = &twl4030_modules[chip];
 384         int                     status;
 385
 386         pdev = platform_device_alloc(name, num);
 387         if (!pdev) {
 388                 dev_dbg(&twl->client->dev, "can't alloc dev\n");
 389                 status = -ENOMEM;
 390                 goto err;
 391         }
 392
 393         device_init_wakeup(&pdev->dev, can_wakeup);
 394         pdev->dev.parent = &twl->client->dev;
 395
 396         if (pdata) {
 397                 status = platform_device_add_data(pdev, pdata, pdata_len);
 398                 if (status < 0) {
 399                         dev_dbg(&pdev->dev, "can't add platform_data\n");
 400                         goto err;
 401                 }
 402         }
 403
 404         if (irq0) {
 405                 struct resource r[2] = {
 406                         { .start = irq0, .flags = IORESOURCE_IRQ, },
 407                         { .start = irq1, .flags = IORESOURCE_IRQ, },
 408                 };
 409
 410                 status = platform_device_add_resources(pdev, r, irq1 ? 2 : 1);
 411                 if (status < 0) {
 412                         dev_dbg(&pdev->dev, "can't add irqs\n");
 413                         goto err;
 414                 }
 415         }
 416
 417         status = platform_device_add(pdev);
 418
 419 err:
 420         if (status < 0) {
 421                 platform_device_put(pdev);
 422                 dev_err(&twl->client->dev, "can't add %s dev\n", name);
 423                 return ERR_PTR(status);
 424         }
 425         return &pdev->dev;
 426 }
 427
 428 static inline struct device *add_child(unsigned chip, const char *name,
 429                 void *pdata, unsigned pdata_len,
 430                 bool can_wakeup, int irq0, int irq1)
 431 {
 432         return add_numbered_child(chip, name, -1, pdata, pdata_len,
 433                 can_wakeup, irq0, irq1);
 434 }
 435
 436 static struct device *
 437 add_regulator_linked(int num, struct regulator_init_data *pdata,
 438                 struct regulator_consumer_supply *consumers,
 439                 unsigned num_consumers)
 440 {
 441         /* regulator framework demands init_data ... */
 442         if (!pdata)
 443                 return NULL;
 444
 445         if (consumers) {
 446                 pdata->consumer_supplies = consumers;
 447                 pdata->num_consumer_supplies = num_consumers;
 448         }
 449
 450         /* NOTE:  we currently ignore regulator IRQs, e.g. for short circuits */
 451         return add_numbered_child(3, "twl4030_reg", num,
 452                 pdata, sizeof(*pdata), false, 0, 0);
 453 }
 454
 455 static struct device *
 456 add_regulator(int num, struct regulator_init_data *pdata)
 457 {
 458         return add_regulator_linked(num, pdata, NULL, 0);
 459 }
 460
 461 /*
 462  * NOTE:  We know the first 8 IRQs after pdata->base_irq are
 463  * for the PIH, and the next are for the PWR_INT SIH, since
 464  * that's how twl_init_irq() sets things up.
 465  */
 466
 467 static int
 468 add_children(struct twl4030_platform_data *pdata, unsigned long features)
 469 {
 470         struct device   *child;
 471         struct device   *usb_transceiver = NULL;
 472
 473         if (twl_has_bci() && pdata->bci && !(features & TPS_SUBSET)) {
 474                 child = add_child(3, "twl4030_bci",
 475                                 pdata->bci, sizeof(*pdata->bci),
 476                                 false,
 477                                 /* irq0 = CHG_PRES, irq1 = BCI */
 478                                 pdata->irq_base + 8 + 1, pdata->irq_base + 2);
 479                 if (IS_ERR(child))
 480                         return PTR_ERR(child);
 481         }
 482
 483         if (twl_has_gpio() && pdata->gpio) {
 484                 child = add_child(1, "twl4030_gpio",
 485                                 pdata->gpio, sizeof(*pdata->gpio),
 486                                 false, pdata->irq_base + 0, 0);
 487                 if (IS_ERR(child))
 488                         return PTR_ERR(child);
 489         }
 490
 491         if (twl_has_keypad() && pdata->keypad) {
 492                 child = add_child(2, "twl4030_keypad",
 493                                 pdata->keypad, sizeof(*pdata->keypad),
 494                                 true, pdata->irq_base + 1, 0);
 495                 if (IS_ERR(child))
 496                         return PTR_ERR(child);
 497         }
 498
 499         if (twl_has_madc() && pdata->madc) {
 500                 child = add_child(2, "twl4030_madc",
 501                                 pdata->madc, sizeof(*pdata->madc),
 502                                 true, pdata->irq_base + 3, 0);
 503                 if (IS_ERR(child))
 504                         return PTR_ERR(child);
 505         }
 506
 507         if (twl_has_rtc()) {
 508                 /*
 509                  * REVISIT platform_data here currently might expose the
 510                  * "msecure" line ... but for now we just expect board
 511                  * setup to tell the chip "it's always ok to SET_TIME".
 512                  * Eventually, Linux might become more aware of such
 513                  * HW security concerns, and "least privilege".
 514                  */
 515                 child = add_child(3, "twl4030_rtc",
 516                                 NULL, 0,
 517                                 true, pdata->irq_base + 8 + 3, 0);
 518                 if (IS_ERR(child))
 519                         return PTR_ERR(child);
 520         }
 521
 522         if (twl_has_usb() && pdata->usb) {
 523                 child = add_child(0, "twl4030_usb",
 524                                 pdata->usb, sizeof(*pdata->usb),
 525                                 true,
 526                                 /* irq0 = USB_PRES, irq1 = USB */
 527                                 pdata->irq_base + 8 + 2, pdata->irq_base + 4);
 528                 if (IS_ERR(child))
 529                         return PTR_ERR(child);
 530
 531                 /* we need to connect regulators to this transceiver */
 532                 usb_transceiver = child;
 533         }
 534
 535         if (twl_has_watchdog()) {
 536                 child = add_child(0, "twl4030_wdt", NULL, 0, false, 0, 0);
 537                 if (IS_ERR(child))
 538                         return PTR_ERR(child);
 539         }
 540
 541         if (twl_has_regulator()) {
 542                 /*
 543                 child = add_regulator(TWL4030_REG_VPLL1, pdata->vpll1);
 544                 if (IS_ERR(child))
 545                         return PTR_ERR(child);
 546                 */
 547
 548                 child = add_regulator(TWL4030_REG_VMMC1, pdata->vmmc1);
 549                 if (IS_ERR(child))
 550                         return PTR_ERR(child);
 551
 552                 child = add_regulator(TWL4030_REG_VDAC, pdata->vdac);
 553                 if (IS_ERR(child))
 554                         return PTR_ERR(child);
 555
 556                 child = add_regulator((features & TWL4030_VAUX2)
 557                                         ? TWL4030_REG_VAUX2_4030
 558                                         : TWL4030_REG_VAUX2,
 559                                 pdata->vaux2);
 560                 if (IS_ERR(child))
 561                         return PTR_ERR(child);
 562         }
 563
 564         if (twl_has_regulator() && usb_transceiver) {
 565                 static struct regulator_consumer_supply usb1v5 = {
 566                         .supply =       "usb1v5",
 567                 };
 568                 static struct regulator_consumer_supply usb1v8 = {
 569                         .supply =       "usb1v8",
 570                 };
 571                 static struct regulator_consumer_supply usb3v1 = {
 572                         .supply =       "usb3v1",
 573                 };
 574
 575                 /* this is a template that gets copied */
 576                 struct regulator_init_data usb_fixed = {
 577                         .constraints.valid_modes_mask =
 578                                   REGULATOR_MODE_NORMAL
 579                                 | REGULATOR_MODE_STANDBY,
 580                         .constraints.valid_ops_mask =
 581                                   REGULATOR_CHANGE_MODE
 582                                 | REGULATOR_CHANGE_STATUS,
 583                 };
 584
 585                 usb1v5.dev = usb_transceiver;
 586                 usb1v8.dev = usb_transceiver;
 587                 usb3v1.dev = usb_transceiver;
 588
 589                 child = add_regulator_linked(TWL4030_REG_VUSB1V5, &usb_fixed,
 590                                 &usb1v5, 1);
 591                 if (IS_ERR(child))
 592                         return PTR_ERR(child);
 593
 594                 child = add_regulator_linked(TWL4030_REG_VUSB1V8, &usb_fixed,
 595                                 &usb1v8, 1);
 596                 if (IS_ERR(child))
 597                         return PTR_ERR(child);
 598
 599                 child = add_regulator_linked(TWL4030_REG_VUSB3V1, &usb_fixed,
 600                                 &usb3v1, 1);
 601                 if (IS_ERR(child))
 602                         return PTR_ERR(child);
 603         }
 604
 605         /* maybe add LDOs that are omitted on cost-reduced parts */
 606         if (twl_has_regulator() && !(features & TPS_SUBSET)) {
 607                 child = add_regulator(TWL4030_REG_VPLL2, pdata->vpll2);
 608                 if (IS_ERR(child))
 609                         return PTR_ERR(child);
 610
 611                 child = add_regulator(TWL4030_REG_VMMC2, pdata->vmmc2);
 612                 if (IS_ERR(child))
 613                         return PTR_ERR(child);
 614
 615                 child = add_regulator(TWL4030_REG_VSIM, pdata->vsim);
 616                 if (IS_ERR(child))
 617                         return PTR_ERR(child);
 618
 619                 child = add_regulator(TWL4030_REG_VAUX1, pdata->vaux1);
 620                 if (IS_ERR(child))
 621                         return PTR_ERR(child);
 622
 623                 child = add_regulator(TWL4030_REG_VAUX3, pdata->vaux3);
 624                 if (IS_ERR(child))
 625                         return PTR_ERR(child);
 626
 627                 child = add_regulator(TWL4030_REG_VAUX4, pdata->vaux4);
 628                 if (IS_ERR(child))
 629                         return PTR_ERR(child);
 630         }
 631
 632         return 0;
 633 }
 634
 635 /*----------------------------------------------------------------------*/
 636
 637 /*
 638  * These three functions initialize the on-chip clock framework,
 639  * letting it generate the right frequencies for USB, MADC, and
 640  * other purposes.
 641  */
 642 static inline int __init protect_pm_master(void)
 643 {
 644         int e = 0;
 645
 646         e = twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, KEY_LOCK,
 647                         R_PROTECT_KEY);
 648         return e;
 649 }
 650
 651 static inline int __init unprotect_pm_master(void)
 652 {
 653         int e = 0;
 654
 655         e |= twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, KEY_UNLOCK1,
 656                         R_PROTECT_KEY);
 657         e |= twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, KEY_UNLOCK2,
 658                         R_PROTECT_KEY);
 659         return e;
 660 }
 661
 662 static void clocks_init(struct device *dev)
 663 {
 664         int e = 0;
 665         struct clk *osc;
 666         u32 rate;
 667         u8 ctrl = HFCLK_FREQ_26_MHZ;
 668
 669 #if defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
 670         if (cpu_is_omap2430())
 671                 osc = clk_get(dev, "osc_ck");
 672         else
 673                 osc = clk_get(dev, "osc_sys_ck");
 674
 675         if (IS_ERR(osc)) {
 676                 printk(KERN_WARNING "Skipping twl4030 internal clock init and "
 677                                 "using bootloader value (unknown osc rate)\n");
 678                 return;
 679         }
 680
 681         rate = clk_get_rate(osc);
 682         clk_put(osc);
 683
 684 #else
 685         /* REVISIT for non-OMAP systems, pass the clock rate from
 686          * board init code, using platform_data.
 687          */
 688         osc = ERR_PTR(-EIO);
 689
 690         printk(KERN_WARNING "Skipping twl4030 internal clock init and "
 691                "using bootloader value (unknown osc rate)\n");
 692
 693         return;
 694 #endif
 695
 696         switch (rate) {
 697         case 19200000:
 698                 ctrl = HFCLK_FREQ_19p2_MHZ;
 699                 break;
 700         case 26000000:
 701                 ctrl = HFCLK_FREQ_26_MHZ;
 702                 break;
 703         case 38400000:
 704                 ctrl = HFCLK_FREQ_38p4_MHZ;
 705                 break;
 706         }
 707
 708         ctrl |= HIGH_PERF_SQ;
 709         e |= unprotect_pm_master();
 710         /* effect->MADC+USB ck en */
 711         e |= twl4030_i2c_write_u8(TWL4030_MODULE_PM_MASTER, ctrl, R_CFG_BOOT);
 712         e |= protect_pm_master();
 713
 714         if (e < 0)
 715                 pr_err("%s: clock init err [%d]\n", DRIVER_NAME, e);
 716 }
 717
 718 /*----------------------------------------------------------------------*/
 719
 720 int twl_init_irq(int irq_num, unsigned irq_base, unsigned irq_end);
 721 int twl_exit_irq(void);
 722
 723 static int twl4030_remove(struct i2c_client *client)
 724 {
 725         unsigned i;
 726         int status;
 727
 728         status = twl_exit_irq();
 729         if (status < 0)
 730                 return status;
 731
 732         for (i = 0; i < TWL4030_NUM_SLAVES; i++) {
 733                 struct twl4030_client   *twl = &twl4030_modules[i];
 734
 735                 if (twl->client && twl->client != client)
 736                         i2c_unregister_device(twl->client);
 737                 twl4030_modules[i].client = NULL;
 738         }
 739         inuse = false;
 740         return 0;
 741 }
 742
 743 /* NOTE:  this driver only handles a single twl4030/tps659x0 chip */
 744 static int
 745 twl4030_probe(struct i2c_client *client, const struct i2c_device_id *id)
 746 {
 747         int                             status;
 748         unsigned                        i;
 749         struct twl4030_platform_data    *pdata = client->dev.platform_data;
 750
 751         if (!pdata) {
 752                 dev_dbg(&client->dev, "no platform data?\n");
 753                 return -EINVAL;
 754         }
 755
 756         if (i2c_check_functionality(client->adapter, I2C_FUNC_I2C) == 0) {
 757                 dev_dbg(&client->dev, "can't talk I2C?\n");
 758                 return -EIO;
 759         }
 760
 761         if (inuse) {
 762                 dev_dbg(&client->dev, "driver is already in use\n");
 763                 return -EBUSY;
 764         }
 765
 766         for (i = 0; i < TWL4030_NUM_SLAVES; i++) {
 767                 struct twl4030_client   *twl = &twl4030_modules[i];
 768
 769                 twl->address = client->addr + i;
 770                 if (i == 0)
 771                         twl->client = client;
 772                 else {
 773                         twl->client = i2c_new_dummy(client->adapter,
 774                                         twl->address);
 775                         if (!twl->client) {
 776                                 dev_err(&twl->client->dev,
 777                                         "can't attach client %d\n", i);
 778                                 status = -ENOMEM;
 779                                 goto fail;
 780                         }
 781                         strlcpy(twl->client->name, id->name,
 782                                         sizeof(twl->client->name));
 783                 }
 784                 mutex_init(&twl->xfer_lock);
 785         }
 786         inuse = true;
 787
 788         /* setup clock framework */
 789         clocks_init(&client->dev);
 790
 791         /* Maybe init the T2 Interrupt subsystem */
 792         if (client->irq
 793                         && pdata->irq_base
 794                         && pdata->irq_end > pdata->irq_base) {
 795                 status = twl_init_irq(client->irq, pdata->irq_base, pdata->irq_end);
 796                 if (status < 0)
 797                         goto fail;
 798         }
 799
 800         status = add_children(pdata, id->driver_data);
 801 fail:
 802         if (status < 0)
 803                 twl4030_remove(client);
 804         return status;
 805 }
 806
 807 static const struct i2c_device_id twl4030_ids[] = {
 808         { "twl4030", TWL4030_VAUX2 },   /* "Triton 2" */
 809         { "twl5030", 0 },               /* T2 updated */
 810         { "tps65950", 0 },              /* catalog version of twl5030 */
 811         { "tps65930", TPS_SUBSET },     /* fewer LDOs and DACs; no charger */
 812         { "tps65920", TPS_SUBSET },     /* fewer LDOs; no codec or charger */
 813         { /* end of list */ },
 814 };
 815 MODULE_DEVICE_TABLE(i2c, twl4030_ids);
 816
 817 /* One Client Driver , 4 Clients */
 818 static struct i2c_driver twl4030_driver = {
 819         .driver.name    = DRIVER_NAME,
 820         .id_table       = twl4030_ids,
 821         .probe          = twl4030_probe,
 822         .remove         = twl4030_remove,
 823 };
 824
 825 static int __init twl4030_init(void)
 826 {
 827         return i2c_add_driver(&twl4030_driver);
 828 }
 829 subsys_initcall(twl4030_init);
 830
 831 static void __exit twl4030_exit(void)
 832 {
 833         i2c_del_driver(&twl4030_driver);
 834 }
 835 module_exit(twl4030_exit);
 836
 837 MODULE_AUTHOR("Texas Instruments, Inc.");
 838 MODULE_DESCRIPTION("I2C Core interface for TWL4030");
 839 MODULE_LICENSE("GPL");