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   1 /*
   2  * tps6507x-regulator.c
   3  *
   4  * Regulator driver for TPS65073 PMIC
   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 #include <linux/slab.h>
  28 #include <linux/mfd/tps6507x.h>
  29
  30 /* DCDC's */
  31 #define TPS6507X_DCDC_1                         0
  32 #define TPS6507X_DCDC_2                         1
  33 #define TPS6507X_DCDC_3                         2
  34 /* LDOs */
  35 #define TPS6507X_LDO_1                          3
  36 #define TPS6507X_LDO_2                          4
  37
  38 #define TPS6507X_MAX_REG_ID                     TPS6507X_LDO_2
  39
  40 /* Number of step-down converters available */
  41 #define TPS6507X_NUM_DCDC                       3
  42 /* Number of LDO voltage regulators  available */
  43 #define TPS6507X_NUM_LDO                        2
  44 /* Number of total regulators available */
  45 #define TPS6507X_NUM_REGULATOR          (TPS6507X_NUM_DCDC + TPS6507X_NUM_LDO)
  46
  47 /* Supported voltage values for regulators (in milliVolts) */
  48 static const u16 VDCDCx_VSEL_table[] = {
  49         725, 750, 775, 800,
  50         825, 850, 875, 900,
  51         925, 950, 975, 1000,
  52         1025, 1050, 1075, 1100,
  53         1125, 1150, 1175, 1200,
  54         1225, 1250, 1275, 1300,
  55         1325, 1350, 1375, 1400,
  56         1425, 1450, 1475, 1500,
  57         1550, 1600, 1650, 1700,
  58         1750, 1800, 1850, 1900,
  59         1950, 2000, 2050, 2100,
  60         2150, 2200, 2250, 2300,
  61         2350, 2400, 2450, 2500,
  62         2550, 2600, 2650, 2700,
  63         2750, 2800, 2850, 2900,
  64         3000, 3100, 3200, 3300,
  65 };
  66
  67 static const u16 LDO1_VSEL_table[] = {
  68         1000, 1100, 1200, 1250,
  69         1300, 1350, 1400, 1500,
  70         1600, 1800, 2500, 2750,
  71         2800, 3000, 3100, 3300,
  72 };
  73
  74 static const u16 LDO2_VSEL_table[] = {
  75         725, 750, 775, 800,
  76         825, 850, 875, 900,
  77         925, 950, 975, 1000,
  78         1025, 1050, 1075, 1100,
  79         1125, 1150, 1175, 1200,
  80         1225, 1250, 1275, 1300,
  81         1325, 1350, 1375, 1400,
  82         1425, 1450, 1475, 1500,
  83         1550, 1600, 1650, 1700,
  84         1750, 1800, 1850, 1900,
  85         1950, 2000, 2050, 2100,
  86         2150, 2200, 2250, 2300,
  87         2350, 2400, 2450, 2500,
  88         2550, 2600, 2650, 2700,
  89         2750, 2800, 2850, 2900,
  90         3000, 3100, 3200, 3300,
  91 };
  92
  93 static unsigned int num_voltages[] = {ARRAY_SIZE(VDCDCx_VSEL_table),
  94                                 ARRAY_SIZE(VDCDCx_VSEL_table),
  95                                 ARRAY_SIZE(VDCDCx_VSEL_table),
  96                                 ARRAY_SIZE(LDO1_VSEL_table),
  97                                 ARRAY_SIZE(LDO2_VSEL_table)};
  98
  99 struct tps_info {
 100         const char *name;
 101         unsigned min_uV;
 102         unsigned max_uV;
 103         u8 table_len;
 104         const u16 *table;
 105 };
 106
 107 struct tps_pmic {
 108         struct regulator_desc desc[TPS6507X_NUM_REGULATOR];
 109         struct i2c_client *client;
 110         struct regulator_dev *rdev[TPS6507X_NUM_REGULATOR];
 111         const struct tps_info *info[TPS6507X_NUM_REGULATOR];
 112         struct mutex io_lock;
 113 };
 114
 115 static inline int tps_6507x_read(struct tps_pmic *tps, u8 reg)
 116 {
 117         return i2c_smbus_read_byte_data(tps->client, reg);
 118 }
 119
 120 static inline int tps_6507x_write(struct tps_pmic *tps, u8 reg, u8 val)
 121 {
 122         return i2c_smbus_write_byte_data(tps->client, reg, val);
 123 }
 124
 125 static int tps_6507x_set_bits(struct tps_pmic *tps, u8 reg, u8 mask)
 126 {
 127         int err, data;
 128
 129         mutex_lock(&tps->io_lock);
 130
 131         data = tps_6507x_read(tps, reg);
 132         if (data < 0) {
 133                 dev_err(&tps->client->dev, "Read from reg 0x%x failed\n", reg);
 134                 err = data;
 135                 goto out;
 136         }
 137
 138         data |= mask;
 139         err = tps_6507x_write(tps, reg, data);
 140         if (err)
 141                 dev_err(&tps->client->dev, "Write for reg 0x%x failed\n", reg);
 142
 143 out:
 144         mutex_unlock(&tps->io_lock);
 145         return err;
 146 }
 147
 148 static int tps_6507x_clear_bits(struct tps_pmic *tps, u8 reg, u8 mask)
 149 {
 150         int err, data;
 151
 152         mutex_lock(&tps->io_lock);
 153
 154         data = tps_6507x_read(tps, reg);
 155         if (data < 0) {
 156                 dev_err(&tps->client->dev, "Read from reg 0x%x failed\n", reg);
 157                 err = data;
 158                 goto out;
 159         }
 160
 161         data &= ~mask;
 162         err = tps_6507x_write(tps, reg, data);
 163         if (err)
 164                 dev_err(&tps->client->dev, "Write for reg 0x%x failed\n", reg);
 165
 166 out:
 167         mutex_unlock(&tps->io_lock);
 168         return err;
 169 }
 170
 171 static int tps_6507x_reg_read(struct tps_pmic *tps, u8 reg)
 172 {
 173         int data;
 174
 175         mutex_lock(&tps->io_lock);
 176
 177         data = tps_6507x_read(tps, reg);
 178         if (data < 0)
 179                 dev_err(&tps->client->dev, "Read from reg 0x%x failed\n", reg);
 180
 181         mutex_unlock(&tps->io_lock);
 182         return data;
 183 }
 184
 185 static int tps_6507x_reg_write(struct tps_pmic *tps, u8 reg, u8 val)
 186 {
 187         int err;
 188
 189         mutex_lock(&tps->io_lock);
 190
 191         err = tps_6507x_write(tps, reg, val);
 192         if (err < 0)
 193                 dev_err(&tps->client->dev, "Write for reg 0x%x failed\n", reg);
 194
 195         mutex_unlock(&tps->io_lock);
 196         return err;
 197 }
 198
 199 static int tps6507x_dcdc_is_enabled(struct regulator_dev *dev)
 200 {
 201         struct tps_pmic *tps = rdev_get_drvdata(dev);
 202         int data, dcdc = rdev_get_id(dev);
 203         u8 shift;
 204
 205         if (dcdc < TPS6507X_DCDC_1 || dcdc > TPS6507X_DCDC_3)
 206                 return -EINVAL;
 207
 208         shift = TPS6507X_MAX_REG_ID - dcdc;
 209         data = tps_6507x_reg_read(tps, TPS6507X_REG_CON_CTRL1);
 210
 211         if (data < 0)
 212                 return data;
 213         else
 214                 return (data & 1<<shift) ? 1 : 0;
 215 }
 216
 217 static int tps6507x_ldo_is_enabled(struct regulator_dev *dev)
 218 {
 219         struct tps_pmic *tps = rdev_get_drvdata(dev);
 220         int data, ldo = rdev_get_id(dev);
 221         u8 shift;
 222
 223         if (ldo < TPS6507X_LDO_1 || ldo > TPS6507X_LDO_2)
 224                 return -EINVAL;
 225
 226         shift = TPS6507X_MAX_REG_ID - ldo;
 227         data = tps_6507x_reg_read(tps, TPS6507X_REG_CON_CTRL1);
 228
 229         if (data < 0)
 230                 return data;
 231         else
 232                 return (data & 1<<shift) ? 1 : 0;
 233 }
 234
 235 static int tps6507x_dcdc_enable(struct regulator_dev *dev)
 236 {
 237         struct tps_pmic *tps = rdev_get_drvdata(dev);
 238         int dcdc = rdev_get_id(dev);
 239         u8 shift;
 240
 241         if (dcdc < TPS6507X_DCDC_1 || dcdc > TPS6507X_DCDC_3)
 242                 return -EINVAL;
 243
 244         shift = TPS6507X_MAX_REG_ID - dcdc;
 245         return tps_6507x_set_bits(tps, TPS6507X_REG_CON_CTRL1, 1 << shift);
 246 }
 247
 248 static int tps6507x_dcdc_disable(struct regulator_dev *dev)
 249 {
 250         struct tps_pmic *tps = rdev_get_drvdata(dev);
 251         int dcdc = rdev_get_id(dev);
 252         u8 shift;
 253
 254         if (dcdc < TPS6507X_DCDC_1 || dcdc > TPS6507X_DCDC_3)
 255                 return -EINVAL;
 256
 257         shift = TPS6507X_MAX_REG_ID - dcdc;
 258         return tps_6507x_clear_bits(tps, TPS6507X_REG_CON_CTRL1, 1 << shift);
 259 }
 260
 261 static int tps6507x_ldo_enable(struct regulator_dev *dev)
 262 {
 263         struct tps_pmic *tps = rdev_get_drvdata(dev);
 264         int ldo = rdev_get_id(dev);
 265         u8 shift;
 266
 267         if (ldo < TPS6507X_LDO_1 || ldo > TPS6507X_LDO_2)
 268                 return -EINVAL;
 269
 270         shift = TPS6507X_MAX_REG_ID - ldo;
 271         return tps_6507x_set_bits(tps, TPS6507X_REG_CON_CTRL1, 1 << shift);
 272 }
 273
 274 static int tps6507x_ldo_disable(struct regulator_dev *dev)
 275 {
 276         struct tps_pmic *tps = rdev_get_drvdata(dev);
 277         int ldo = rdev_get_id(dev);
 278         u8 shift;
 279
 280         if (ldo < TPS6507X_LDO_1 || ldo > TPS6507X_LDO_2)
 281                 return -EINVAL;
 282
 283         shift = TPS6507X_MAX_REG_ID - ldo;
 284         return tps_6507x_clear_bits(tps, TPS6507X_REG_CON_CTRL1, 1 << shift);
 285 }
 286
 287 static int tps6507x_dcdc_get_voltage(struct regulator_dev *dev)
 288 {
 289         struct tps_pmic *tps = rdev_get_drvdata(dev);
 290         int data, dcdc = rdev_get_id(dev);
 291         u8 reg;
 292
 293         switch (dcdc) {
 294         case TPS6507X_DCDC_1:
 295                 reg = TPS6507X_REG_DEFDCDC1;
 296                 break;
 297         case TPS6507X_DCDC_2:
 298                 reg = TPS6507X_REG_DEFDCDC2_LOW;
 299                 break;
 300         case TPS6507X_DCDC_3:
 301                 reg = TPS6507X_REG_DEFDCDC3_LOW;
 302                 break;
 303         default:
 304                 return -EINVAL;
 305         }
 306
 307         data = tps_6507x_reg_read(tps, reg);
 308         if (data < 0)
 309                 return data;
 310
 311         data &= TPS6507X_DEFDCDCX_DCDC_MASK;
 312         return tps->info[dcdc]->table[data] * 1000;
 313 }
 314
 315 static int tps6507x_dcdc_set_voltage(struct regulator_dev *dev,
 316                                 int min_uV, int max_uV)
 317 {
 318         struct tps_pmic *tps = rdev_get_drvdata(dev);
 319         int data, vsel, dcdc = rdev_get_id(dev);
 320         u8 reg;
 321
 322         switch (dcdc) {
 323         case TPS6507X_DCDC_1:
 324                 reg = TPS6507X_REG_DEFDCDC1;
 325                 break;
 326         case TPS6507X_DCDC_2:
 327                 reg = TPS6507X_REG_DEFDCDC2_LOW;
 328                 break;
 329         case TPS6507X_DCDC_3:
 330                 reg = TPS6507X_REG_DEFDCDC3_LOW;
 331                 break;
 332         default:
 333                 return -EINVAL;
 334         }
 335
 336         if (min_uV < tps->info[dcdc]->min_uV
 337                 || min_uV > tps->info[dcdc]->max_uV)
 338                 return -EINVAL;
 339         if (max_uV < tps->info[dcdc]->min_uV
 340                 || max_uV > tps->info[dcdc]->max_uV)
 341                 return -EINVAL;
 342
 343         for (vsel = 0; vsel < tps->info[dcdc]->table_len; vsel++) {
 344                 int mV = tps->info[dcdc]->table[vsel];
 345                 int uV = mV * 1000;
 346
 347                 /* Break at the first in-range value */
 348                 if (min_uV <= uV && uV <= max_uV)
 349                         break;
 350         }
 351
 352         /* write to the register in case we found a match */
 353         if (vsel == tps->info[dcdc]->table_len)
 354                 return -EINVAL;
 355
 356         data = tps_6507x_reg_read(tps, reg);
 357         if (data < 0)
 358                 return data;
 359
 360         data &= ~TPS6507X_DEFDCDCX_DCDC_MASK;
 361         data |= vsel;
 362
 363         return tps_6507x_reg_write(tps, reg, data);
 364 }
 365
 366 static int tps6507x_ldo_get_voltage(struct regulator_dev *dev)
 367 {
 368         struct tps_pmic *tps = rdev_get_drvdata(dev);
 369         int data, ldo = rdev_get_id(dev);
 370         u8 reg, mask;
 371
 372         if (ldo < TPS6507X_LDO_1 || ldo > TPS6507X_LDO_2)
 373                 return -EINVAL;
 374         else {
 375                 reg = (ldo == TPS6507X_LDO_1 ?
 376                         TPS6507X_REG_LDO_CTRL1 : TPS6507X_REG_DEFLDO2);
 377                 mask = (ldo == TPS6507X_LDO_1 ?
 378                         TPS6507X_REG_LDO_CTRL1_LDO1_MASK :
 379                                 TPS6507X_REG_DEFLDO2_LDO2_MASK);
 380         }
 381
 382         data = tps_6507x_reg_read(tps, reg);
 383         if (data < 0)
 384                 return data;
 385
 386         data &= mask;
 387         return tps->info[ldo]->table[data] * 1000;
 388 }
 389
 390 static int tps6507x_ldo_set_voltage(struct regulator_dev *dev,
 391                                 int min_uV, int max_uV)
 392 {
 393         struct tps_pmic *tps = rdev_get_drvdata(dev);
 394         int data, vsel, ldo = rdev_get_id(dev);
 395         u8 reg, mask;
 396
 397         if (ldo < TPS6507X_LDO_1 || ldo > TPS6507X_LDO_2)
 398                 return -EINVAL;
 399         else {
 400                 reg = (ldo == TPS6507X_LDO_1 ?
 401                         TPS6507X_REG_LDO_CTRL1 : TPS6507X_REG_DEFLDO2);
 402                 mask = (ldo == TPS6507X_LDO_1 ?
 403                         TPS6507X_REG_LDO_CTRL1_LDO1_MASK :
 404                                 TPS6507X_REG_DEFLDO2_LDO2_MASK);
 405         }
 406
 407         if (min_uV < tps->info[ldo]->min_uV || min_uV > tps->info[ldo]->max_uV)
 408                 return -EINVAL;
 409         if (max_uV < tps->info[ldo]->min_uV || max_uV > tps->info[ldo]->max_uV)
 410                 return -EINVAL;
 411
 412         for (vsel = 0; vsel < tps->info[ldo]->table_len; vsel++) {
 413                 int mV = tps->info[ldo]->table[vsel];
 414                 int uV = mV * 1000;
 415
 416                 /* Break at the first in-range value */
 417                 if (min_uV <= uV && uV <= max_uV)
 418                         break;
 419         }
 420
 421         if (vsel == tps->info[ldo]->table_len)
 422                 return -EINVAL;
 423
 424         data = tps_6507x_reg_read(tps, reg);
 425         if (data < 0)
 426                 return data;
 427
 428         data &= ~mask;
 429         data |= vsel;
 430
 431         return tps_6507x_reg_write(tps, reg, data);
 432 }
 433
 434 static int tps6507x_dcdc_list_voltage(struct regulator_dev *dev,
 435                                         unsigned selector)
 436 {
 437         struct tps_pmic *tps = rdev_get_drvdata(dev);
 438         int dcdc = rdev_get_id(dev);
 439
 440         if (dcdc < TPS6507X_DCDC_1 || dcdc > TPS6507X_DCDC_3)
 441                 return -EINVAL;
 442
 443         if (selector >= tps->info[dcdc]->table_len)
 444                 return -EINVAL;
 445         else
 446                 return tps->info[dcdc]->table[selector] * 1000;
 447 }
 448
 449 static int tps6507x_ldo_list_voltage(struct regulator_dev *dev,
 450                                         unsigned selector)
 451 {
 452         struct tps_pmic *tps = rdev_get_drvdata(dev);
 453         int ldo = rdev_get_id(dev);
 454
 455         if (ldo < TPS6507X_LDO_1 || ldo > TPS6507X_LDO_2)
 456                 return -EINVAL;
 457
 458         if (selector >= tps->info[ldo]->table_len)
 459                 return -EINVAL;
 460         else
 461                 return tps->info[ldo]->table[selector] * 1000;
 462 }
 463
 464 /* Operations permitted on VDCDCx */
 465 static struct regulator_ops tps6507x_dcdc_ops = {
 466         .is_enabled = tps6507x_dcdc_is_enabled,
 467         .enable = tps6507x_dcdc_enable,
 468         .disable = tps6507x_dcdc_disable,
 469         .get_voltage = tps6507x_dcdc_get_voltage,
 470         .set_voltage = tps6507x_dcdc_set_voltage,
 471         .list_voltage = tps6507x_dcdc_list_voltage,
 472 };
 473
 474 /* Operations permitted on LDOx */
 475 static struct regulator_ops tps6507x_ldo_ops = {
 476         .is_enabled = tps6507x_ldo_is_enabled,
 477         .enable = tps6507x_ldo_enable,
 478         .disable = tps6507x_ldo_disable,
 479         .get_voltage = tps6507x_ldo_get_voltage,
 480         .set_voltage = tps6507x_ldo_set_voltage,
 481         .list_voltage = tps6507x_ldo_list_voltage,
 482 };
 483
 484 static int __devinit tps_6507x_probe(struct i2c_client *client,
 485                                      const struct i2c_device_id *id)
 486 {
 487         static int desc_id;
 488         const struct tps_info *info = (void *)id->driver_data;
 489         struct regulator_init_data *init_data;
 490         struct regulator_dev *rdev;
 491         struct tps_pmic *tps;
 492         int i;
 493         int error;
 494
 495         if (!i2c_check_functionality(client->adapter,
 496                                 I2C_FUNC_SMBUS_BYTE_DATA))
 497                 return -EIO;
 498
 499         /**
 500          * init_data points to array of regulator_init structures
 501          * coming from the board-evm file.
 502          */
 503         init_data = client->dev.platform_data;
 504         if (!init_data)
 505                 return -EIO;
 506
 507         tps = kzalloc(sizeof(*tps), GFP_KERNEL);
 508         if (!tps)
 509                 return -ENOMEM;
 510
 511         mutex_init(&tps->io_lock);
 512
 513         /* common for all regulators */
 514         tps->client = client;
 515
 516         for (i = 0; i < TPS6507X_NUM_REGULATOR; i++, info++, init_data++) {
 517                 /* Register the regulators */
 518                 tps->info[i] = info;
 519                 tps->desc[i].name = info->name;
 520                 tps->desc[i].id = desc_id++;
 521                 tps->desc[i].n_voltages = num_voltages[i];
 522                 tps->desc[i].ops = (i > TPS6507X_DCDC_3 ?
 523                                 &tps6507x_ldo_ops : &tps6507x_dcdc_ops);
 524                 tps->desc[i].type = REGULATOR_VOLTAGE;
 525                 tps->desc[i].owner = THIS_MODULE;
 526
 527                 rdev = regulator_register(&tps->desc[i],
 528                                         &client->dev, init_data, tps);
 529                 if (IS_ERR(rdev)) {
 530                         dev_err(&client->dev, "failed to register %s\n",
 531                                 id->name);
 532                         error = PTR_ERR(rdev);
 533                         goto fail;
 534                 }
 535
 536                 /* Save regulator for cleanup */
 537                 tps->rdev[i] = rdev;
 538         }
 539
 540         i2c_set_clientdata(client, tps);
 541
 542         return 0;
 543
 544 fail:
 545         while (--i >= 0)
 546                 regulator_unregister(tps->rdev[i]);
 547
 548         kfree(tps);
 549         return error;
 550 }
 551
 552 /**
 553  * tps_6507x_remove - TPS6507x driver i2c remove handler
 554  * @client: i2c driver client device structure
 555  *
 556  * Unregister TPS driver as an i2c client device driver
 557  */
 558 static int __devexit tps_6507x_remove(struct i2c_client *client)
 559 {
 560         struct tps_pmic *tps = i2c_get_clientdata(client);
 561         int i;
 562
 563         /* clear the client data in i2c */
 564         i2c_set_clientdata(client, NULL);
 565
 566         for (i = 0; i < TPS6507X_NUM_REGULATOR; i++)
 567                 regulator_unregister(tps->rdev[i]);
 568
 569         kfree(tps);
 570
 571         return 0;
 572 }
 573
 574 static const struct tps_info tps6507x_regs[] = {
 575         {
 576                 .name = "VDCDC1",
 577                 .min_uV = 725000,
 578                 .max_uV = 3300000,
 579                 .table_len = ARRAY_SIZE(VDCDCx_VSEL_table),
 580                 .table = VDCDCx_VSEL_table,
 581         },
 582         {
 583                 .name = "VDCDC2",
 584                 .min_uV = 725000,
 585                 .max_uV = 3300000,
 586                 .table_len = ARRAY_SIZE(VDCDCx_VSEL_table),
 587                 .table = VDCDCx_VSEL_table,
 588         },
 589         {
 590                 .name = "VDCDC3",
 591                 .min_uV = 725000,
 592                 .max_uV = 3300000,
 593                 .table_len = ARRAY_SIZE(VDCDCx_VSEL_table),
 594                 .table = VDCDCx_VSEL_table,
 595         },
 596         {
 597                 .name = "LDO1",
 598                 .min_uV = 1000000,
 599                 .max_uV = 3300000,
 600                 .table_len = ARRAY_SIZE(LDO1_VSEL_table),
 601                 .table = LDO1_VSEL_table,
 602         },
 603         {
 604                 .name = "LDO2",
 605                 .min_uV = 725000,
 606                 .max_uV = 3300000,
 607                 .table_len = ARRAY_SIZE(LDO2_VSEL_table),
 608                 .table = LDO2_VSEL_table,
 609         },
 610 };
 611
 612 static const struct i2c_device_id tps_6507x_id[] = {
 613         {.name = "tps6507x",
 614         .driver_data = (unsigned long) tps6507x_regs,},
 615         { },
 616 };
 617 MODULE_DEVICE_TABLE(i2c, tps_6507x_id);
 618
 619 static struct i2c_driver tps_6507x_i2c_driver = {
 620         .driver = {
 621                 .name = "tps6507x",
 622                 .owner = THIS_MODULE,
 623         },
 624         .probe = tps_6507x_probe,
 625         .remove = __devexit_p(tps_6507x_remove),
 626         .id_table = tps_6507x_id,
 627 };
 628
 629 /**
 630  * tps_6507x_init
 631  *
 632  * Module init function
 633  */
 634 static int __init tps_6507x_init(void)
 635 {
 636         return i2c_add_driver(&tps_6507x_i2c_driver);
 637 }
 638 subsys_initcall(tps_6507x_init);
 639
 640 /**
 641  * tps_6507x_cleanup
 642  *
 643  * Module exit function
 644  */
 645 static void __exit tps_6507x_cleanup(void)
 646 {
 647         i2c_del_driver(&tps_6507x_i2c_driver);
 648 }
 649 module_exit(tps_6507x_cleanup);
 650
 651 MODULE_AUTHOR("Texas Instruments");
 652 MODULE_DESCRIPTION("TPS6507x voltage regulator driver");
 653 MODULE_LICENSE("GPL v2");