drivers/mfd/twl4030-power.c

   1 /*
   2  * linux/drivers/i2c/chips/twl4030-power.c
   3  *
   4  * Handle TWL4030 Power initialization
   5  *
   6  * Copyright (C) 2008 Nokia Corporation
   7  * Copyright (C) 2006 Texas Instruments, Inc
   8  *
   9  * Written by   Kalle Jokiniemi
  10  *              Peter De Schrijver <peter.de-schrijver@nokia.com>
  11  * Several fixes by Amit Kucheria <amit.kucheria@verdurent.com>
  12  *
  13  * This file is subject to the terms and conditions of the GNU General
  14  * Public License. See the file "COPYING" in the main directory of this
  15  * archive for more details.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  25  */
  26
  27 #include <linux/module.h>
  28 #include <linux/pm.h>
  29 #include <linux/i2c/twl.h>
  30 #include <linux/platform_device.h>
  31 #include <linux/of.h>
  32
  33 #include <asm/mach-types.h>
  34
  35 static u8 twl4030_start_script_address = 0x2b;
  36
  37 #define PWR_P1_SW_EVENTS        0x10
  38 #define PWR_DEVOFF              (1 << 0)
  39 #define SEQ_OFFSYNC             (1 << 0)
  40
  41 #define PHY_TO_OFF_PM_MASTER(p)         (p - 0x36)
  42 #define PHY_TO_OFF_PM_RECEIVER(p)       (p - 0x5b)
  43
  44 /* resource - hfclk */
  45 #define R_HFCLKOUT_DEV_GRP      PHY_TO_OFF_PM_RECEIVER(0xe6)
  46
  47 /* PM events */
  48 #define R_P1_SW_EVENTS          PHY_TO_OFF_PM_MASTER(0x46)
  49 #define R_P2_SW_EVENTS          PHY_TO_OFF_PM_MASTER(0x47)
  50 #define R_P3_SW_EVENTS          PHY_TO_OFF_PM_MASTER(0x48)
  51 #define R_CFG_P1_TRANSITION     PHY_TO_OFF_PM_MASTER(0x36)
  52 #define R_CFG_P2_TRANSITION     PHY_TO_OFF_PM_MASTER(0x37)
  53 #define R_CFG_P3_TRANSITION     PHY_TO_OFF_PM_MASTER(0x38)
  54
  55 #define LVL_WAKEUP      0x08
  56
  57 #define ENABLE_WARMRESET (1<<4)
  58
  59 #define END_OF_SCRIPT           0x3f
  60
  61 #define R_SEQ_ADD_A2S           PHY_TO_OFF_PM_MASTER(0x55)
  62 #define R_SEQ_ADD_S2A12         PHY_TO_OFF_PM_MASTER(0x56)
  63 #define R_SEQ_ADD_S2A3          PHY_TO_OFF_PM_MASTER(0x57)
  64 #define R_SEQ_ADD_WARM          PHY_TO_OFF_PM_MASTER(0x58)
  65 #define R_MEMORY_ADDRESS        PHY_TO_OFF_PM_MASTER(0x59)
  66 #define R_MEMORY_DATA           PHY_TO_OFF_PM_MASTER(0x5a)
  67
  68 /* resource configuration registers
  69    <RESOURCE>_DEV_GRP   at address 'n+0'
  70    <RESOURCE>_TYPE      at address 'n+1'
  71    <RESOURCE>_REMAP     at address 'n+2'
  72    <RESOURCE>_DEDICATED at address 'n+3'
  73 */
  74 #define DEV_GRP_OFFSET          0
  75 #define TYPE_OFFSET             1
  76 #define REMAP_OFFSET            2
  77 #define DEDICATED_OFFSET        3
  78
  79 /* Bit positions in the registers */
  80
  81 /* <RESOURCE>_DEV_GRP */
  82 #define DEV_GRP_SHIFT           5
  83 #define DEV_GRP_MASK            (7 << DEV_GRP_SHIFT)
  84
  85 /* <RESOURCE>_TYPE */
  86 #define TYPE_SHIFT              0
  87 #define TYPE_MASK               (7 << TYPE_SHIFT)
  88 #define TYPE2_SHIFT             3
  89 #define TYPE2_MASK              (3 << TYPE2_SHIFT)
  90
  91 /* <RESOURCE>_REMAP */
  92 #define SLEEP_STATE_SHIFT       0
  93 #define SLEEP_STATE_MASK        (0xf << SLEEP_STATE_SHIFT)
  94 #define OFF_STATE_SHIFT         4
  95 #define OFF_STATE_MASK          (0xf << OFF_STATE_SHIFT)
  96
  97 static u8 res_config_addrs[] = {
  98         [RES_VAUX1]     = 0x17,
  99         [RES_VAUX2]     = 0x1b,
 100         [RES_VAUX3]     = 0x1f,
 101         [RES_VAUX4]     = 0x23,
 102         [RES_VMMC1]     = 0x27,
 103         [RES_VMMC2]     = 0x2b,
 104         [RES_VPLL1]     = 0x2f,
 105         [RES_VPLL2]     = 0x33,
 106         [RES_VSIM]      = 0x37,
 107         [RES_VDAC]      = 0x3b,
 108         [RES_VINTANA1]  = 0x3f,
 109         [RES_VINTANA2]  = 0x43,
 110         [RES_VINTDIG]   = 0x47,
 111         [RES_VIO]       = 0x4b,
 112         [RES_VDD1]      = 0x55,
 113         [RES_VDD2]      = 0x63,
 114         [RES_VUSB_1V5]  = 0x71,
 115         [RES_VUSB_1V8]  = 0x74,
 116         [RES_VUSB_3V1]  = 0x77,
 117         [RES_VUSBCP]    = 0x7a,
 118         [RES_REGEN]     = 0x7f,
 119         [RES_NRES_PWRON] = 0x82,
 120         [RES_CLKEN]     = 0x85,
 121         [RES_SYSEN]     = 0x88,
 122         [RES_HFCLKOUT]  = 0x8b,
 123         [RES_32KCLKOUT] = 0x8e,
 124         [RES_RESET]     = 0x91,
 125         [RES_MAIN_REF]  = 0x94,
 126 };
 127
 128 static int twl4030_write_script_byte(u8 address, u8 byte)
 129 {
 130         int err;
 131
 132         err = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, address, R_MEMORY_ADDRESS);
 133         if (err)
 134                 goto out;
 135         err = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, byte, R_MEMORY_DATA);
 136 out:
 137         return err;
 138 }
 139
 140 static int twl4030_write_script_ins(u8 address, u16 pmb_message,
 141                                            u8 delay, u8 next)
 142 {
 143         int err;
 144
 145         address *= 4;
 146         err = twl4030_write_script_byte(address++, pmb_message >> 8);
 147         if (err)
 148                 goto out;
 149         err = twl4030_write_script_byte(address++, pmb_message & 0xff);
 150         if (err)
 151                 goto out;
 152         err = twl4030_write_script_byte(address++, delay);
 153         if (err)
 154                 goto out;
 155         err = twl4030_write_script_byte(address++, next);
 156 out:
 157         return err;
 158 }
 159
 160 static int twl4030_write_script(u8 address, struct twl4030_ins *script,
 161                                        int len)
 162 {
 163         int err = -EINVAL;
 164
 165         for (; len; len--, address++, script++) {
 166                 if (len == 1) {
 167                         err = twl4030_write_script_ins(address,
 168                                                 script->pmb_message,
 169                                                 script->delay,
 170                                                 END_OF_SCRIPT);
 171                         if (err)
 172                                 break;
 173                 } else {
 174                         err = twl4030_write_script_ins(address,
 175                                                 script->pmb_message,
 176                                                 script->delay,
 177                                                 address + 1);
 178                         if (err)
 179                                 break;
 180                 }
 181         }
 182         return err;
 183 }
 184
 185 static int twl4030_config_wakeup3_sequence(u8 address)
 186 {
 187         int err;
 188         u8 data;
 189
 190         /* Set SLEEP to ACTIVE SEQ address for P3 */
 191         err = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, address, R_SEQ_ADD_S2A3);
 192         if (err)
 193                 goto out;
 194
 195         /* P3 LVL_WAKEUP should be on LEVEL */
 196         err = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &data, R_P3_SW_EVENTS);
 197         if (err)
 198                 goto out;
 199         data |= LVL_WAKEUP;
 200         err = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, data, R_P3_SW_EVENTS);
 201 out:
 202         if (err)
 203                 pr_err("TWL4030 wakeup sequence for P3 config error\n");
 204         return err;
 205 }
 206
 207 static int twl4030_config_wakeup12_sequence(u8 address)
 208 {
 209         int err = 0;
 210         u8 data;
 211
 212         /* Set SLEEP to ACTIVE SEQ address for P1 and P2 */
 213         err = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, address, R_SEQ_ADD_S2A12);
 214         if (err)
 215                 goto out;
 216
 217         /* P1/P2 LVL_WAKEUP should be on LEVEL */
 218         err = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &data, R_P1_SW_EVENTS);
 219         if (err)
 220                 goto out;
 221
 222         data |= LVL_WAKEUP;
 223         err = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, data, R_P1_SW_EVENTS);
 224         if (err)
 225                 goto out;
 226
 227         err = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &data, R_P2_SW_EVENTS);
 228         if (err)
 229                 goto out;
 230
 231         data |= LVL_WAKEUP;
 232         err = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, data, R_P2_SW_EVENTS);
 233         if (err)
 234                 goto out;
 235
 236         if (machine_is_omap_3430sdp() || machine_is_omap_ldp()) {
 237                 /* Disabling AC charger effect on sleep-active transitions */
 238                 err = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &data,
 239                                       R_CFG_P1_TRANSITION);
 240                 if (err)
 241                         goto out;
 242                 data &= ~(1<<1);
 243                 err = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, data,
 244                                        R_CFG_P1_TRANSITION);
 245                 if (err)
 246                         goto out;
 247         }
 248
 249 out:
 250         if (err)
 251                 pr_err("TWL4030 wakeup sequence for P1 and P2" \
 252                         "config error\n");
 253         return err;
 254 }
 255
 256 static int twl4030_config_sleep_sequence(u8 address)
 257 {
 258         int err;
 259
 260         /* Set ACTIVE to SLEEP SEQ address in T2 memory*/
 261         err = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, address, R_SEQ_ADD_A2S);
 262
 263         if (err)
 264                 pr_err("TWL4030 sleep sequence config error\n");
 265
 266         return err;
 267 }
 268
 269 static int twl4030_config_warmreset_sequence(u8 address)
 270 {
 271         int err;
 272         u8 rd_data;
 273
 274         /* Set WARM RESET SEQ address for P1 */
 275         err = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, address, R_SEQ_ADD_WARM);
 276         if (err)
 277                 goto out;
 278
 279         /* P1/P2/P3 enable WARMRESET */
 280         err = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &rd_data, R_P1_SW_EVENTS);
 281         if (err)
 282                 goto out;
 283
 284         rd_data |= ENABLE_WARMRESET;
 285         err = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, rd_data, R_P1_SW_EVENTS);
 286         if (err)
 287                 goto out;
 288
 289         err = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &rd_data, R_P2_SW_EVENTS);
 290         if (err)
 291                 goto out;
 292
 293         rd_data |= ENABLE_WARMRESET;
 294         err = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, rd_data, R_P2_SW_EVENTS);
 295         if (err)
 296                 goto out;
 297
 298         err = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &rd_data, R_P3_SW_EVENTS);
 299         if (err)
 300                 goto out;
 301
 302         rd_data |= ENABLE_WARMRESET;
 303         err = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, rd_data, R_P3_SW_EVENTS);
 304 out:
 305         if (err)
 306                 pr_err("TWL4030 warmreset seq config error\n");
 307         return err;
 308 }
 309
 310 static int twl4030_configure_resource(struct twl4030_resconfig *rconfig)
 311 {
 312         int rconfig_addr;
 313         int err;
 314         u8 type;
 315         u8 grp;
 316         u8 remap;
 317
 318         if (rconfig->resource > TOTAL_RESOURCES) {
 319                 pr_err("TWL4030 Resource %d does not exist\n",
 320                         rconfig->resource);
 321                 return -EINVAL;
 322         }
 323
 324         rconfig_addr = res_config_addrs[rconfig->resource];
 325
 326         /* Set resource group */
 327         err = twl_i2c_read_u8(TWL_MODULE_PM_RECEIVER, &grp,
 328                               rconfig_addr + DEV_GRP_OFFSET);
 329         if (err) {
 330                 pr_err("TWL4030 Resource %d group could not be read\n",
 331                         rconfig->resource);
 332                 return err;
 333         }
 334
 335         if (rconfig->devgroup != TWL4030_RESCONFIG_UNDEF) {
 336                 grp &= ~DEV_GRP_MASK;
 337                 grp |= rconfig->devgroup << DEV_GRP_SHIFT;
 338                 err = twl_i2c_write_u8(TWL_MODULE_PM_RECEIVER,
 339                                        grp, rconfig_addr + DEV_GRP_OFFSET);
 340                 if (err < 0) {
 341                         pr_err("TWL4030 failed to program devgroup\n");
 342                         return err;
 343                 }
 344         }
 345
 346         /* Set resource types */
 347         err = twl_i2c_read_u8(TWL_MODULE_PM_RECEIVER, &type,
 348                                 rconfig_addr + TYPE_OFFSET);
 349         if (err < 0) {
 350                 pr_err("TWL4030 Resource %d type could not be read\n",
 351                         rconfig->resource);
 352                 return err;
 353         }
 354
 355         if (rconfig->type != TWL4030_RESCONFIG_UNDEF) {
 356                 type &= ~TYPE_MASK;
 357                 type |= rconfig->type << TYPE_SHIFT;
 358         }
 359
 360         if (rconfig->type2 != TWL4030_RESCONFIG_UNDEF) {
 361                 type &= ~TYPE2_MASK;
 362                 type |= rconfig->type2 << TYPE2_SHIFT;
 363         }
 364
 365         err = twl_i2c_write_u8(TWL_MODULE_PM_RECEIVER,
 366                                 type, rconfig_addr + TYPE_OFFSET);
 367         if (err < 0) {
 368                 pr_err("TWL4030 failed to program resource type\n");
 369                 return err;
 370         }
 371
 372         /* Set remap states */
 373         err = twl_i2c_read_u8(TWL_MODULE_PM_RECEIVER, &remap,
 374                               rconfig_addr + REMAP_OFFSET);
 375         if (err < 0) {
 376                 pr_err("TWL4030 Resource %d remap could not be read\n",
 377                         rconfig->resource);
 378                 return err;
 379         }
 380
 381         if (rconfig->remap_off != TWL4030_RESCONFIG_UNDEF) {
 382                 remap &= ~OFF_STATE_MASK;
 383                 remap |= rconfig->remap_off << OFF_STATE_SHIFT;
 384         }
 385
 386         if (rconfig->remap_sleep != TWL4030_RESCONFIG_UNDEF) {
 387                 remap &= ~SLEEP_STATE_MASK;
 388                 remap |= rconfig->remap_sleep << SLEEP_STATE_SHIFT;
 389         }
 390
 391         err = twl_i2c_write_u8(TWL_MODULE_PM_RECEIVER,
 392                                remap,
 393                                rconfig_addr + REMAP_OFFSET);
 394         if (err < 0) {
 395                 pr_err("TWL4030 failed to program remap\n");
 396                 return err;
 397         }
 398
 399         return 0;
 400 }
 401
 402 static int load_twl4030_script(struct twl4030_script *tscript,
 403                u8 address)
 404 {
 405         int err;
 406         static int order;
 407
 408         /* Make sure the script isn't going beyond last valid address (0x3f) */
 409         if ((address + tscript->size) > END_OF_SCRIPT) {
 410                 pr_err("TWL4030 scripts too big error\n");
 411                 return -EINVAL;
 412         }
 413
 414         err = twl4030_write_script(address, tscript->script, tscript->size);
 415         if (err)
 416                 goto out;
 417
 418         if (tscript->flags & TWL4030_WRST_SCRIPT) {
 419                 err = twl4030_config_warmreset_sequence(address);
 420                 if (err)
 421                         goto out;
 422         }
 423         if (tscript->flags & TWL4030_WAKEUP12_SCRIPT) {
 424                 err = twl4030_config_wakeup12_sequence(address);
 425                 if (err)
 426                         goto out;
 427                 order = 1;
 428         }
 429         if (tscript->flags & TWL4030_WAKEUP3_SCRIPT) {
 430                 err = twl4030_config_wakeup3_sequence(address);
 431                 if (err)
 432                         goto out;
 433         }
 434         if (tscript->flags & TWL4030_SLEEP_SCRIPT) {
 435                 if (!order)
 436                         pr_warning("TWL4030: Bad order of scripts (sleep "\
 437                                         "script before wakeup) Leads to boot"\
 438                                         "failure on some boards\n");
 439                 err = twl4030_config_sleep_sequence(address);
 440         }
 441 out:
 442         return err;
 443 }
 444
 445 int twl4030_remove_script(u8 flags)
 446 {
 447         int err = 0;
 448
 449         err = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, TWL4030_PM_MASTER_KEY_CFG1,
 450                                TWL4030_PM_MASTER_PROTECT_KEY);
 451         if (err) {
 452                 pr_err("twl4030: unable to unlock PROTECT_KEY\n");
 453                 return err;
 454         }
 455
 456         err = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, TWL4030_PM_MASTER_KEY_CFG2,
 457                                TWL4030_PM_MASTER_PROTECT_KEY);
 458         if (err) {
 459                 pr_err("twl4030: unable to unlock PROTECT_KEY\n");
 460                 return err;
 461         }
 462
 463         if (flags & TWL4030_WRST_SCRIPT) {
 464                 err = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, END_OF_SCRIPT,
 465                                        R_SEQ_ADD_WARM);
 466                 if (err)
 467                         return err;
 468         }
 469         if (flags & TWL4030_WAKEUP12_SCRIPT) {
 470                 err = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, END_OF_SCRIPT,
 471                                        R_SEQ_ADD_S2A12);
 472                 if (err)
 473                         return err;
 474         }
 475         if (flags & TWL4030_WAKEUP3_SCRIPT) {
 476                 err = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, END_OF_SCRIPT,
 477                                        R_SEQ_ADD_S2A3);
 478                 if (err)
 479                         return err;
 480         }
 481         if (flags & TWL4030_SLEEP_SCRIPT) {
 482                 err = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, END_OF_SCRIPT,
 483                                        R_SEQ_ADD_A2S);
 484                 if (err)
 485                         return err;
 486         }
 487
 488         err = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, 0,
 489                                TWL4030_PM_MASTER_PROTECT_KEY);
 490         if (err)
 491                 pr_err("TWL4030 Unable to relock registers\n");
 492
 493         return err;
 494 }
 495
 496 static int twl4030_power_configure_scripts(struct twl4030_power_data *pdata)
 497 {
 498         int err;
 499         int i;
 500         u8 address = twl4030_start_script_address;
 501
 502         for (i = 0; i < pdata->num; i++) {
 503                 err = load_twl4030_script(pdata->scripts[i], address);
 504                 if (err)
 505                         return err;
 506                 address += pdata->scripts[i]->size;
 507         }
 508
 509         return 0;
 510 }
 511
 512 static int twl4030_power_configure_resources(struct twl4030_power_data *pdata)
 513 {
 514         struct twl4030_resconfig *resconfig = pdata->resource_config;
 515         int err;
 516
 517         if (resconfig) {
 518                 while (resconfig->resource) {
 519                         err = twl4030_configure_resource(resconfig);
 520                         if (err)
 521                                 return err;
 522                         resconfig++;
 523                 }
 524         }
 525
 526         return 0;
 527 }
 528
 529 /*
 530  * In master mode, start the power off sequence.
 531  * After a successful execution, TWL shuts down the power to the SoC
 532  * and all peripherals connected to it.
 533  */
 534 void twl4030_power_off(void)
 535 {
 536         int err;
 537
 538         err = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, PWR_DEVOFF,
 539                                TWL4030_PM_MASTER_P1_SW_EVENTS);
 540         if (err)
 541                 pr_err("TWL4030 Unable to power off\n");
 542 }
 543
 544 static bool twl4030_power_use_poweroff(struct twl4030_power_data *pdata,
 545                                         struct device_node *node)
 546 {
 547         if (pdata && pdata->use_poweroff)
 548                 return true;
 549
 550         if (of_property_read_bool(node, "ti,use_poweroff"))
 551                 return true;
 552
 553         return false;
 554 }
 555
 556 static int twl4030_power_probe(struct platform_device *pdev)
 557 {
 558         struct twl4030_power_data *pdata = dev_get_platdata(&pdev->dev);
 559         struct device_node *node = pdev->dev.of_node;
 560         int err = 0;
 561         int err2 = 0;
 562         u8 val;
 563
 564         if (!pdata && !node) {
 565                 dev_err(&pdev->dev, "Platform data is missing\n");
 566                 return -EINVAL;
 567         }
 568
 569         err = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, TWL4030_PM_MASTER_KEY_CFG1,
 570                                TWL4030_PM_MASTER_PROTECT_KEY);
 571         err |= twl_i2c_write_u8(TWL_MODULE_PM_MASTER,
 572                                TWL4030_PM_MASTER_KEY_CFG2,
 573                                TWL4030_PM_MASTER_PROTECT_KEY);
 574
 575         if (err) {
 576                 pr_err("TWL4030 Unable to unlock registers\n");
 577                 return err;
 578         }
 579
 580         if (pdata) {
 581                 /* TODO: convert to device tree */
 582                 err = twl4030_power_configure_scripts(pdata);
 583                 if (err) {
 584                         pr_err("TWL4030 failed to load scripts\n");
 585                         goto relock;
 586                 }
 587                 err = twl4030_power_configure_resources(pdata);
 588                 if (err) {
 589                         pr_err("TWL4030 failed to configure resource\n");
 590                         goto relock;
 591                 }
 592         }
 593
 594         /* Board has to be wired properly to use this feature */
 595         if (twl4030_power_use_poweroff(pdata, node) && !pm_power_off) {
 596                 /* Default for SEQ_OFFSYNC is set, lets ensure this */
 597                 err = twl_i2c_read_u8(TWL_MODULE_PM_MASTER, &val,
 598                                       TWL4030_PM_MASTER_CFG_P123_TRANSITION);
 599                 if (err) {
 600                         pr_warning("TWL4030 Unable to read registers\n");
 601
 602                 } else if (!(val & SEQ_OFFSYNC)) {
 603                         val |= SEQ_OFFSYNC;
 604                         err = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, val,
 605                                         TWL4030_PM_MASTER_CFG_P123_TRANSITION);
 606                         if (err) {
 607                                 pr_err("TWL4030 Unable to setup SEQ_OFFSYNC\n");
 608                                 goto relock;
 609                         }
 610                 }
 611
 612                 pm_power_off = twl4030_power_off;
 613         }
 614
 615 relock:
 616         err2 = twl_i2c_write_u8(TWL_MODULE_PM_MASTER, 0,
 617                                TWL4030_PM_MASTER_PROTECT_KEY);
 618         if (err2) {
 619                 pr_err("TWL4030 Unable to relock registers\n");
 620                 return err2;
 621         }
 622
 623         return err;
 624 }
 625
 626 static int twl4030_power_remove(struct platform_device *pdev)
 627 {
 628         return 0;
 629 }
 630
 631 #ifdef CONFIG_OF
 632 static const struct of_device_id twl4030_power_of_match[] = {
 633         {.compatible = "ti,twl4030-power", },
 634         { },
 635 };
 636 MODULE_DEVICE_TABLE(of, twl4030_power_of_match);
 637 #endif
 638
 639 static struct platform_driver twl4030_power_driver = {
 640         .driver = {
 641                 .name   = "twl4030_power",
 642                 .owner  = THIS_MODULE,
 643                 .of_match_table = of_match_ptr(twl4030_power_of_match),
 644         },
 645         .probe          = twl4030_power_probe,
 646         .remove         = twl4030_power_remove,
 647 };
 648
 649 module_platform_driver(twl4030_power_driver);
 650
 651 MODULE_AUTHOR("Nokia Corporation");
 652 MODULE_AUTHOR("Texas Instruments, Inc.");
 653 MODULE_DESCRIPTION("Power management for TWL4030");
 654 MODULE_LICENSE("GPL");
 655 MODULE_ALIAS("platform:twl4030_power");