drivers/regulator/tps65023-regulator.c

   1 /*
   2  * tps65023-regulator.c
   3  *
   4  * Supports TPS65023 Regulator
   5  *
   6  * Copyright (C) 2009 Texas Instrument Incorporated - http://www.ti.com/
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation version 2.
  11  *
  12  * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,
  13  * whether express or implied; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License for more details.
  16  */
  17
  18 #include <linux/kernel.h>
  19 #include <linux/module.h>
  20 #include <linux/init.h>
  21 #include <linux/err.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/regulator/driver.h>
  24 #include <linux/regulator/machine.h>
  25 #include <linux/i2c.h>
  26 #include <linux/delay.h>
  27
  28 /* Register definitions */
  29 #define TPS65023_REG_VERSION            0
  30 #define TPS65023_REG_PGOODZ             1
  31 #define TPS65023_REG_MASK               2
  32 #define TPS65023_REG_REG_CTRL           3
  33 #define TPS65023_REG_CON_CTRL           4
  34 #define TPS65023_REG_CON_CTRL2          5
  35 #define TPS65023_REG_DEF_CORE           6
  36 #define TPS65023_REG_DEFSLEW            7
  37 #define TPS65023_REG_LDO_CTRL           8
  38
  39 /* PGOODZ bitfields */
  40 #define TPS65023_PGOODZ_PWRFAILZ        BIT(7)
  41 #define TPS65023_PGOODZ_LOWBATTZ        BIT(6)
  42 #define TPS65023_PGOODZ_VDCDC1          BIT(5)
  43 #define TPS65023_PGOODZ_VDCDC2          BIT(4)
  44 #define TPS65023_PGOODZ_VDCDC3          BIT(3)
  45 #define TPS65023_PGOODZ_LDO2            BIT(2)
  46 #define TPS65023_PGOODZ_LDO1            BIT(1)
  47
  48 /* MASK bitfields */
  49 #define TPS65023_MASK_PWRFAILZ          BIT(7)
  50 #define TPS65023_MASK_LOWBATTZ          BIT(6)
  51 #define TPS65023_MASK_VDCDC1            BIT(5)
  52 #define TPS65023_MASK_VDCDC2            BIT(4)
  53 #define TPS65023_MASK_VDCDC3            BIT(3)
  54 #define TPS65023_MASK_LDO2              BIT(2)
  55 #define TPS65023_MASK_LDO1              BIT(1)
  56
  57 /* REG_CTRL bitfields */
  58 #define TPS65023_REG_CTRL_VDCDC1_EN     BIT(5)
  59 #define TPS65023_REG_CTRL_VDCDC2_EN     BIT(4)
  60 #define TPS65023_REG_CTRL_VDCDC3_EN     BIT(3)
  61 #define TPS65023_REG_CTRL_LDO2_EN       BIT(2)
  62 #define TPS65023_REG_CTRL_LDO1_EN       BIT(1)
  63
  64 /* LDO_CTRL bitfields */
  65 #define TPS65023_LDO_CTRL_LDOx_SHIFT(ldo_id)    ((ldo_id)*4)
  66 #define TPS65023_LDO_CTRL_LDOx_MASK(ldo_id)     (0xF0 >> ((ldo_id)*4))
  67
  68 /* Number of step-down converters available */
  69 #define TPS65023_NUM_DCDC               3
  70 /* Number of LDO voltage regulators  available */
  71 #define TPS65023_NUM_LDO                2
  72 /* Number of total regulators available */
  73 #define TPS65023_NUM_REGULATOR  (TPS65023_NUM_DCDC + TPS65023_NUM_LDO)
  74
  75 /* DCDCs */
  76 #define TPS65023_DCDC_1                 0
  77 #define TPS65023_DCDC_2                 1
  78 #define TPS65023_DCDC_3                 2
  79 /* LDOs */
  80 #define TPS65023_LDO_1                  3
  81 #define TPS65023_LDO_2                  4
  82
  83 #define TPS65023_MAX_REG_ID             TPS65023_LDO_2
  84
  85 /* Supported voltage values for regulators */
  86 static const u16 VDCDC1_VSEL_table[] = {
  87         800, 825, 850, 875,
  88         900, 925, 950, 975,
  89         1000, 1025, 1050, 1075,
  90         1100, 1125, 1150, 1175,
  91         1200, 1225, 1250, 1275,
  92         1300, 1325, 1350, 1375,
  93         1400, 1425, 1450, 1475,
  94         1500, 1525, 1550, 1600,
  95 };
  96
  97 static const u16 LDO1_VSEL_table[] = {
  98         1000, 1100, 1300, 1800,
  99         2200, 2600, 2800, 3150,
 100 };
 101
 102 static const u16 LDO2_VSEL_table[] = {
 103         1050, 1200, 1300, 1800,
 104         2500, 2800, 3000, 3300,
 105 };
 106
 107 static unsigned int num_voltages[] = {ARRAY_SIZE(VDCDC1_VSEL_table),
 108                                 0, 0, ARRAY_SIZE(LDO1_VSEL_table),
 109                                 ARRAY_SIZE(LDO2_VSEL_table)};
 110
 111 /* Regulator specific details */
 112 struct tps_info {
 113         const char *name;
 114         unsigned min_uV;
 115         unsigned max_uV;
 116         bool fixed;
 117         u8 table_len;
 118         const u16 *table;
 119 };
 120
 121 /* PMIC details */
 122 struct tps_pmic {
 123         struct regulator_desc desc[TPS65023_NUM_REGULATOR];
 124         struct i2c_client *client;
 125         struct regulator_dev *rdev[TPS65023_NUM_REGULATOR];
 126         const struct tps_info *info[TPS65023_NUM_REGULATOR];
 127         struct mutex io_lock;
 128 };
 129
 130 static inline int tps_65023_read(struct tps_pmic *tps, u8 reg)
 131 {
 132         return i2c_smbus_read_byte_data(tps->client, reg);
 133 }
 134
 135 static inline int tps_65023_write(struct tps_pmic *tps, u8 reg, u8 val)
 136 {
 137         return i2c_smbus_write_byte_data(tps->client, reg, val);
 138 }
 139
 140 static int tps_65023_set_bits(struct tps_pmic *tps, u8 reg, u8 mask)
 141 {
 142         int err, data;
 143
 144         mutex_lock(&tps->io_lock);
 145
 146         data = tps_65023_read(tps, reg);
 147         if (data < 0) {
 148                 dev_err(&tps->client->dev, "Read from reg 0x%x failed\n", reg);
 149                 err = data;
 150                 goto out;
 151         }
 152
 153         data |= mask;
 154         err = tps_65023_write(tps, reg, data);
 155         if (err)
 156                 dev_err(&tps->client->dev, "Write for reg 0x%x failed\n", reg);
 157
 158 out:
 159         mutex_unlock(&tps->io_lock);
 160         return err;
 161 }
 162
 163 static int tps_65023_clear_bits(struct tps_pmic *tps, u8 reg, u8 mask)
 164 {
 165         int err, data;
 166
 167         mutex_lock(&tps->io_lock);
 168
 169         data = tps_65023_read(tps, reg);
 170         if (data < 0) {
 171                 dev_err(&tps->client->dev, "Read from reg 0x%x failed\n", reg);
 172                 err = data;
 173                 goto out;
 174         }
 175
 176         data &= ~mask;
 177
 178         err = tps_65023_write(tps, reg, data);
 179         if (err)
 180                 dev_err(&tps->client->dev, "Write for reg 0x%x failed\n", reg);
 181
 182 out:
 183         mutex_unlock(&tps->io_lock);
 184         return err;
 185
 186 }
 187
 188 static int tps_65023_reg_read(struct tps_pmic *tps, u8 reg)
 189 {
 190         int data;
 191
 192         mutex_lock(&tps->io_lock);
 193
 194         data = tps_65023_read(tps, reg);
 195         if (data < 0)
 196                 dev_err(&tps->client->dev, "Read from reg 0x%x failed\n", reg);
 197
 198         mutex_unlock(&tps->io_lock);
 199         return data;
 200 }
 201
 202 static int tps_65023_reg_write(struct tps_pmic *tps, u8 reg, u8 val)
 203 {
 204         int err;
 205
 206         mutex_lock(&tps->io_lock);
 207
 208         err = tps_65023_write(tps, reg, val);
 209         if (err < 0)
 210                 dev_err(&tps->client->dev, "Write for reg 0x%x failed\n", reg);
 211
 212         mutex_unlock(&tps->io_lock);
 213         return err;
 214 }
 215
 216 static int tps65023_dcdc_is_enabled(struct regulator_dev *dev)
 217 {
 218         struct tps_pmic *tps = rdev_get_drvdata(dev);
 219         int data, dcdc = rdev_get_id(dev);
 220         u8 shift;
 221
 222         if (dcdc < TPS65023_DCDC_1 || dcdc > TPS65023_DCDC_3)
 223                 return -EINVAL;
 224
 225         shift = TPS65023_NUM_REGULATOR - dcdc;
 226         data = tps_65023_reg_read(tps, TPS65023_REG_REG_CTRL);
 227
 228         if (data < 0)
 229                 return data;
 230         else
 231                 return (data & 1<<shift) ? 1 : 0;
 232 }
 233
 234 static int tps65023_ldo_is_enabled(struct regulator_dev *dev)
 235 {
 236         struct tps_pmic *tps = rdev_get_drvdata(dev);
 237         int data, ldo = rdev_get_id(dev);
 238         u8 shift;
 239
 240         if (ldo < TPS65023_LDO_1 || ldo > TPS65023_LDO_2)
 241                 return -EINVAL;
 242
 243         shift = (ldo == TPS65023_LDO_1 ? 1 : 2);
 244         data = tps_65023_reg_read(tps, TPS65023_REG_REG_CTRL);
 245
 246         if (data < 0)
 247                 return data;
 248         else
 249                 return (data & 1<<shift) ? 1 : 0;
 250 }
 251
 252 static int tps65023_dcdc_enable(struct regulator_dev *dev)
 253 {
 254         struct tps_pmic *tps = rdev_get_drvdata(dev);
 255         int dcdc = rdev_get_id(dev);
 256         u8 shift;
 257
 258         if (dcdc < TPS65023_DCDC_1 || dcdc > TPS65023_DCDC_3)
 259                 return -EINVAL;
 260
 261         shift = TPS65023_NUM_REGULATOR - dcdc;
 262         return tps_65023_set_bits(tps, TPS65023_REG_REG_CTRL, 1 << shift);
 263 }
 264
 265 static int tps65023_dcdc_disable(struct regulator_dev *dev)
 266 {
 267         struct tps_pmic *tps = rdev_get_drvdata(dev);
 268         int dcdc = rdev_get_id(dev);
 269         u8 shift;
 270
 271         if (dcdc < TPS65023_DCDC_1 || dcdc > TPS65023_DCDC_3)
 272                 return -EINVAL;
 273
 274         shift = TPS65023_NUM_REGULATOR - dcdc;
 275         return tps_65023_clear_bits(tps, TPS65023_REG_REG_CTRL, 1 << shift);
 276 }
 277
 278 static int tps65023_ldo_enable(struct regulator_dev *dev)
 279 {
 280         struct tps_pmic *tps = rdev_get_drvdata(dev);
 281         int ldo = rdev_get_id(dev);
 282         u8 shift;
 283
 284         if (ldo < TPS65023_LDO_1 || ldo > TPS65023_LDO_2)
 285                 return -EINVAL;
 286
 287         shift = (ldo == TPS65023_LDO_1 ? 1 : 2);
 288         return tps_65023_set_bits(tps, TPS65023_REG_REG_CTRL, 1 << shift);
 289 }
 290
 291 static int tps65023_ldo_disable(struct regulator_dev *dev)
 292 {
 293         struct tps_pmic *tps = rdev_get_drvdata(dev);
 294         int ldo = rdev_get_id(dev);
 295         u8 shift;
 296
 297         if (ldo < TPS65023_LDO_1 || ldo > TPS65023_LDO_2)
 298                 return -EINVAL;
 299
 300         shift = (ldo == TPS65023_LDO_1 ? 1 : 2);
 301         return tps_65023_clear_bits(tps, TPS65023_REG_REG_CTRL, 1 << shift);
 302 }
 303
 304 static int tps65023_dcdc_get_voltage(struct regulator_dev *dev)
 305 {
 306         struct tps_pmic *tps = rdev_get_drvdata(dev);
 307         int data, dcdc = rdev_get_id(dev);
 308
 309         if (dcdc < TPS65023_DCDC_1 || dcdc > TPS65023_DCDC_3)
 310                 return -EINVAL;
 311
 312         if (dcdc == TPS65023_DCDC_1) {
 313                 data = tps_65023_reg_read(tps, TPS65023_REG_DEF_CORE);
 314                 if (data < 0)
 315                         return data;
 316                 data &= (tps->info[dcdc]->table_len - 1);
 317                 return tps->info[dcdc]->table[data] * 1000;
 318         } else
 319                 return tps->info[dcdc]->min_uV;
 320 }
 321
 322 static int tps65023_dcdc_set_voltage(struct regulator_dev *dev,
 323                                 int min_uV, int max_uV)
 324 {
 325         struct tps_pmic *tps = rdev_get_drvdata(dev);
 326         int dcdc = rdev_get_id(dev);
 327         int vsel;
 328
 329         if (dcdc != TPS65023_DCDC_1)
 330                 return -EINVAL;
 331
 332         if (min_uV < tps->info[dcdc]->min_uV
 333                         || min_uV > tps->info[dcdc]->max_uV)
 334                 return -EINVAL;
 335         if (max_uV < tps->info[dcdc]->min_uV
 336                         || max_uV > tps->info[dcdc]->max_uV)
 337                 return -EINVAL;
 338
 339         for (vsel = 0; vsel < tps->info[dcdc]->table_len; vsel++) {
 340                 int mV = tps->info[dcdc]->table[vsel];
 341                 int uV = mV * 1000;
 342
 343                 /* Break at the first in-range value */
 344                 if (min_uV <= uV && uV <= max_uV)
 345                         break;
 346         }
 347
 348         /* write to the register in case we found a match */
 349         if (vsel == tps->info[dcdc]->table_len)
 350                 return -EINVAL;
 351         else
 352                 return tps_65023_reg_write(tps, TPS65023_REG_DEF_CORE, vsel);
 353 }
 354
 355 static int tps65023_ldo_get_voltage(struct regulator_dev *dev)
 356 {
 357         struct tps_pmic *tps = rdev_get_drvdata(dev);
 358         int data, ldo = rdev_get_id(dev);
 359
 360         if (ldo < TPS65023_LDO_1 || ldo > TPS65023_LDO_2)
 361                 return -EINVAL;
 362
 363         data = tps_65023_reg_read(tps, TPS65023_REG_LDO_CTRL);
 364         if (data < 0)
 365                 return data;
 366
 367         data >>= (TPS65023_LDO_CTRL_LDOx_SHIFT(ldo - TPS65023_LDO_1));
 368         data &= (tps->info[ldo]->table_len - 1);
 369         return tps->info[ldo]->table[data] * 1000;
 370 }
 371
 372 static int tps65023_ldo_set_voltage(struct regulator_dev *dev,
 373                                 int min_uV, int max_uV)
 374 {
 375         struct tps_pmic *tps = rdev_get_drvdata(dev);
 376         int data, vsel, ldo = rdev_get_id(dev);
 377
 378         if (ldo < TPS65023_LDO_1 || ldo > TPS65023_LDO_2)
 379                 return -EINVAL;
 380
 381         if (min_uV < tps->info[ldo]->min_uV || min_uV > tps->info[ldo]->max_uV)
 382                 return -EINVAL;
 383         if (max_uV < tps->info[ldo]->min_uV || max_uV > tps->info[ldo]->max_uV)
 384                 return -EINVAL;
 385
 386         for (vsel = 0; vsel < tps->info[ldo]->table_len; vsel++) {
 387                 int mV = tps->info[ldo]->table[vsel];
 388                 int uV = mV * 1000;
 389
 390                 /* Break at the first in-range value */
 391                 if (min_uV <= uV && uV <= max_uV)
 392                         break;
 393         }
 394
 395         if (vsel == tps->info[ldo]->table_len)
 396                 return -EINVAL;
 397
 398         data = tps_65023_reg_read(tps, TPS65023_REG_LDO_CTRL);
 399         if (data < 0)
 400                 return data;
 401
 402         data &= TPS65023_LDO_CTRL_LDOx_MASK(ldo - TPS65023_LDO_1);
 403         data |= (vsel << (TPS65023_LDO_CTRL_LDOx_SHIFT(ldo - TPS65023_LDO_1)));
 404         return tps_65023_reg_write(tps, TPS65023_REG_LDO_CTRL, data);
 405 }
 406
 407 static int tps65023_dcdc_list_voltage(struct regulator_dev *dev,
 408                                         unsigned selector)
 409 {
 410         struct tps_pmic *tps = rdev_get_drvdata(dev);
 411         int dcdc = rdev_get_id(dev);
 412
 413         if (dcdc < TPS65023_DCDC_1 || dcdc > TPS65023_DCDC_3)
 414                 return -EINVAL;
 415
 416         if (dcdc == TPS65023_DCDC_1) {
 417                 if (selector >= tps->info[dcdc]->table_len)
 418                         return -EINVAL;
 419                 else
 420                         return tps->info[dcdc]->table[selector] * 1000;
 421         } else
 422                 return tps->info[dcdc]->min_uV;
 423 }
 424
 425 static int tps65023_ldo_list_voltage(struct regulator_dev *dev,
 426                                         unsigned selector)
 427 {
 428         struct tps_pmic *tps = rdev_get_drvdata(dev);
 429         int ldo = rdev_get_id(dev);
 430
 431         if (ldo < TPS65023_LDO_1 || ldo > TPS65023_LDO_2)
 432                 return -EINVAL;
 433
 434         if (selector >= tps->info[ldo]->table_len)
 435                 return -EINVAL;
 436         else
 437                 return tps->info[ldo]->table[selector] * 1000;
 438 }
 439
 440 /* Operations permitted on VDCDCx */
 441 static struct regulator_ops tps65023_dcdc_ops = {
 442         .is_enabled = tps65023_dcdc_is_enabled,
 443         .enable = tps65023_dcdc_enable,
 444         .disable = tps65023_dcdc_disable,
 445         .get_voltage = tps65023_dcdc_get_voltage,
 446         .set_voltage = tps65023_dcdc_set_voltage,
 447         .list_voltage = tps65023_dcdc_list_voltage,
 448 };
 449
 450 /* Operations permitted on LDOx */
 451 static struct regulator_ops tps65023_ldo_ops = {
 452         .is_enabled = tps65023_ldo_is_enabled,
 453         .enable = tps65023_ldo_enable,
 454         .disable = tps65023_ldo_disable,
 455         .get_voltage = tps65023_ldo_get_voltage,
 456         .set_voltage = tps65023_ldo_set_voltage,
 457         .list_voltage = tps65023_ldo_list_voltage,
 458 };
 459
 460 static
 461 int tps_65023_probe(struct i2c_client *client, const struct i2c_device_id *id)
 462 {
 463         static int desc_id;
 464         const struct tps_info *info = (void *)id->driver_data;
 465         struct regulator_init_data *init_data;
 466         struct regulator_dev *rdev;
 467         struct tps_pmic *tps;
 468         int i;
 469
 470         if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 471                 return -EIO;
 472
 473         /**
 474          * init_data points to array of regulator_init structures
 475          * coming from the board-evm file.
 476          */
 477         init_data = client->dev.platform_data;
 478
 479         if (!init_data)
 480                 return -EIO;
 481
 482         tps = kzalloc(sizeof(*tps), GFP_KERNEL);
 483         if (!tps)
 484                 return -ENOMEM;
 485
 486         mutex_init(&tps->io_lock);
 487
 488         /* common for all regulators */
 489         tps->client = client;
 490
 491         for (i = 0; i < TPS65023_NUM_REGULATOR; i++, info++, init_data++) {
 492                 /* Store regulator specific information */
 493                 tps->info[i] = info;
 494
 495                 tps->desc[i].name = info->name;
 496                 tps->desc[i].id = desc_id++;
 497                 tps->desc[i].n_voltages = num_voltages[i];
 498                 tps->desc[i].ops = (i > TPS65023_DCDC_3 ?
 499                                         &tps65023_ldo_ops : &tps65023_dcdc_ops);
 500                 tps->desc[i].type = REGULATOR_VOLTAGE;
 501                 tps->desc[i].owner = THIS_MODULE;
 502
 503                 /* Register the regulators */
 504                 rdev = regulator_register(&tps->desc[i], &client->dev,
 505                                                                 init_data, tps);
 506                 if (IS_ERR(rdev)) {
 507                         dev_err(&client->dev, "failed to register %s\n",
 508                                 id->name);
 509
 510                         /* Unregister */
 511                         while (i)
 512                                 regulator_unregister(tps->rdev[--i]);
 513
 514                         tps->client = NULL;
 515
 516                         /* clear the client data in i2c */
 517                         i2c_set_clientdata(client, NULL);
 518                         kfree(tps);
 519                         return PTR_ERR(rdev);
 520                 }
 521
 522                 /* Save regulator for cleanup */
 523                 tps->rdev[i] = rdev;
 524         }
 525
 526         i2c_set_clientdata(client, tps);
 527
 528         return 0;
 529 }
 530
 531 /**
 532  * tps_65023_remove - TPS65023 driver i2c remove handler
 533  * @client: i2c driver client device structure
 534  *
 535  * Unregister TPS driver as an i2c client device driver
 536  */
 537 static int __devexit tps_65023_remove(struct i2c_client *client)
 538 {
 539         struct tps_pmic *tps = i2c_get_clientdata(client);
 540         int i;
 541
 542         for (i = 0; i < TPS65023_NUM_REGULATOR; i++)
 543                 regulator_unregister(tps->rdev[i]);
 544
 545         tps->client = NULL;
 546
 547         /* clear the client data in i2c */
 548         i2c_set_clientdata(client, NULL);
 549         kfree(tps);
 550
 551         return 0;
 552 }
 553
 554 static const struct tps_info tps65023_regs[] = {
 555         {
 556                 .name = "VDCDC1",
 557                 .min_uV =  800000,
 558                 .max_uV = 1600000,
 559                 .table_len = ARRAY_SIZE(VDCDC1_VSEL_table),
 560                 .table = VDCDC1_VSEL_table,
 561         },
 562         {
 563                 .name = "VDCDC2",
 564                 .min_uV =  3300000,
 565                 .max_uV = 3300000,
 566                 .fixed = 1,
 567         },
 568         {
 569                 .name = "VDCDC3",
 570                 .min_uV =  1800000,
 571                 .max_uV = 1800000,
 572                 .fixed = 1,
 573         },
 574         {
 575                 .name = "LDO1",
 576                 .min_uV = 1000000,
 577                 .max_uV = 3150000,
 578                 .table_len = ARRAY_SIZE(LDO1_VSEL_table),
 579                 .table = LDO1_VSEL_table,
 580         },
 581         {
 582                 .name = "LDO2",
 583                 .min_uV = 1050000,
 584                 .max_uV = 3300000,
 585                 .table_len = ARRAY_SIZE(LDO2_VSEL_table),
 586                 .table = LDO2_VSEL_table,
 587         },
 588 };
 589
 590 static const struct i2c_device_id tps_65023_id[] = {
 591         {.name = "tps65023",
 592         .driver_data = (unsigned long) tps65023_regs,},
 593         { },
 594 };
 595
 596 MODULE_DEVICE_TABLE(i2c, tps_65023_id);
 597
 598 static struct i2c_driver tps_65023_i2c_driver = {
 599         .driver = {
 600                 .name = "tps65023",
 601                 .owner = THIS_MODULE,
 602         },
 603         .probe = tps_65023_probe,
 604         .remove = __devexit_p(tps_65023_remove),
 605         .id_table = tps_65023_id,
 606 };
 607
 608 /**
 609  * tps_65023_init
 610  *
 611  * Module init function
 612  */
 613 static int __init tps_65023_init(void)
 614 {
 615         return i2c_add_driver(&tps_65023_i2c_driver);
 616 }
 617 subsys_initcall(tps_65023_init);
 618
 619 /**
 620  * tps_65023_cleanup
 621  *
 622  * Module exit function
 623  */
 624 static void __exit tps_65023_cleanup(void)
 625 {
 626         i2c_del_driver(&tps_65023_i2c_driver);
 627 }
 628 module_exit(tps_65023_cleanup);
 629
 630 MODULE_AUTHOR("Texas Instruments");
 631 MODULE_DESCRIPTION("TPS65023 voltage regulator driver");
 632 MODULE_LICENSE("GPL v2");