1 /* 2 * Regulator driver for National Semiconductors LP3972 PMIC chip 3 * 4 * Based on lp3971.c 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 * 10 */ 11 12 #include <linux/bug.h> 13 #include <linux/err.h> 14 #include <linux/i2c.h> 15 #include <linux/kernel.h> 16 #include <linux/regulator/driver.h> 17 #include <linux/regulator/lp3972.h> 18 #include <linux/slab.h> 19 20 struct lp3972 { 21 struct device *dev; 22 struct mutex io_lock; 23 struct i2c_client *i2c; 24 int num_regulators; 25 struct regulator_dev **rdev; 26 }; 27 28 /* LP3972 Control Registers */ 29 #define LP3972_SCR_REG 0x07 30 #define LP3972_OVER1_REG 0x10 31 #define LP3972_OVSR1_REG 0x11 32 #define LP3972_OVER2_REG 0x12 33 #define LP3972_OVSR2_REG 0x13 34 #define LP3972_VCC1_REG 0x20 35 #define LP3972_ADTV1_REG 0x23 36 #define LP3972_ADTV2_REG 0x24 37 #define LP3972_AVRC_REG 0x25 38 #define LP3972_CDTC1_REG 0x26 39 #define LP3972_CDTC2_REG 0x27 40 #define LP3972_SDTV1_REG 0x29 41 #define LP3972_SDTV2_REG 0x2A 42 #define LP3972_MDTV1_REG 0x32 43 #define LP3972_MDTV2_REG 0x33 44 #define LP3972_L2VCR_REG 0x39 45 #define LP3972_L34VCR_REG 0x3A 46 #define LP3972_SCR1_REG 0x80 47 #define LP3972_SCR2_REG 0x81 48 #define LP3972_OEN3_REG 0x82 49 #define LP3972_OSR3_REG 0x83 50 #define LP3972_LOER4_REG 0x84 51 #define LP3972_B2TV_REG 0x85 52 #define LP3972_B3TV_REG 0x86 53 #define LP3972_B32RC_REG 0x87 54 #define LP3972_ISRA_REG 0x88 55 #define LP3972_BCCR_REG 0x89 56 #define LP3972_II1RR_REG 0x8E 57 #define LP3972_II2RR_REG 0x8F 58 59 #define LP3972_SYS_CONTROL1_REG LP3972_SCR1_REG 60 /* System control register 1 initial value, 61 * bits 5, 6 and 7 are EPROM programmable */ 62 #define SYS_CONTROL1_INIT_VAL 0x02 63 #define SYS_CONTROL1_INIT_MASK 0x1F 64 65 #define LP3972_VOL_CHANGE_REG LP3972_VCC1_REG 66 #define LP3972_VOL_CHANGE_FLAG_GO 0x01 67 #define LP3972_VOL_CHANGE_FLAG_MASK 0x03 68 69 /* LDO output enable mask */ 70 #define LP3972_OEN3_L1EN BIT(0) 71 #define LP3972_OVER2_LDO2_EN BIT(2) 72 #define LP3972_OVER2_LDO3_EN BIT(3) 73 #define LP3972_OVER2_LDO4_EN BIT(4) 74 #define LP3972_OVER1_S_EN BIT(2) 75 76 static const int ldo1_voltage_map[] = { 77 1700, 1725, 1750, 1775, 1800, 1825, 1850, 1875, 78 1900, 1925, 1950, 1975, 2000, 79 }; 80 81 static const int ldo23_voltage_map[] = { 82 1800, 1900, 2000, 2100, 2200, 2300, 2400, 2500, 83 2600, 2700, 2800, 2900, 3000, 3100, 3200, 3300, 84 }; 85 86 static const int ldo4_voltage_map[] = { 87 1000, 1050, 1100, 1150, 1200, 1250, 1300, 1350, 88 1400, 1500, 1800, 1900, 2500, 2800, 3000, 3300, 89 }; 90 91 static const int ldo5_voltage_map[] = { 92 0, 0, 0, 0, 0, 850, 875, 900, 93 925, 950, 975, 1000, 1025, 1050, 1075, 1100, 94 1125, 1150, 1175, 1200, 1225, 1250, 1275, 1300, 95 1325, 1350, 1375, 1400, 1425, 1450, 1475, 1500, 96 }; 97 98 static const int buck1_voltage_map[] = { 99 725, 750, 775, 800, 825, 850, 875, 900, 100 925, 950, 975, 1000, 1025, 1050, 1075, 1100, 101 1125, 1150, 1175, 1200, 1225, 1250, 1275, 1300, 102 1325, 1350, 1375, 1400, 1425, 1450, 1475, 1500, 103 }; 104 105 static const int buck23_voltage_map[] = { 106 0, 800, 850, 900, 950, 1000, 1050, 1100, 107 1150, 1200, 1250, 1300, 1350, 1400, 1450, 1500, 108 1550, 1600, 1650, 1700, 1800, 1900, 2500, 2800, 109 3000, 3300, 110 }; 111 112 static const int *ldo_voltage_map[] = { 113 ldo1_voltage_map, 114 ldo23_voltage_map, 115 ldo23_voltage_map, 116 ldo4_voltage_map, 117 ldo5_voltage_map, 118 }; 119 120 static const int *buck_voltage_map[] = { 121 buck1_voltage_map, 122 buck23_voltage_map, 123 buck23_voltage_map, 124 }; 125 126 static const int ldo_output_enable_mask[] = { 127 LP3972_OEN3_L1EN, 128 LP3972_OVER2_LDO2_EN, 129 LP3972_OVER2_LDO3_EN, 130 LP3972_OVER2_LDO4_EN, 131 LP3972_OVER1_S_EN, 132 }; 133 134 static const int ldo_output_enable_addr[] = { 135 LP3972_OEN3_REG, 136 LP3972_OVER2_REG, 137 LP3972_OVER2_REG, 138 LP3972_OVER2_REG, 139 LP3972_OVER1_REG, 140 }; 141 142 static const int ldo_vol_ctl_addr[] = { 143 LP3972_MDTV1_REG, 144 LP3972_L2VCR_REG, 145 LP3972_L34VCR_REG, 146 LP3972_L34VCR_REG, 147 LP3972_SDTV1_REG, 148 }; 149 150 static const int buck_vol_enable_addr[] = { 151 LP3972_OVER1_REG, 152 LP3972_OEN3_REG, 153 LP3972_OEN3_REG, 154 }; 155 156 static const int buck_base_addr[] = { 157 LP3972_ADTV1_REG, 158 LP3972_B2TV_REG, 159 LP3972_B3TV_REG, 160 }; 161 162 #define LP3972_LDO_VOL_VALUE_MAP(x) (ldo_voltage_map[x]) 163 #define LP3972_LDO_OUTPUT_ENABLE_MASK(x) (ldo_output_enable_mask[x]) 164 #define LP3972_LDO_OUTPUT_ENABLE_REG(x) (ldo_output_enable_addr[x]) 165 166 /* LDO voltage control registers shift: 167 LP3972_LDO1 -> 0, LP3972_LDO2 -> 4 168 LP3972_LDO3 -> 0, LP3972_LDO4 -> 4 169 LP3972_LDO5 -> 0 170 */ 171 #define LP3972_LDO_VOL_CONTR_SHIFT(x) (((x) & 1) << 2) 172 #define LP3972_LDO_VOL_CONTR_REG(x) (ldo_vol_ctl_addr[x]) 173 #define LP3972_LDO_VOL_CHANGE_SHIFT(x) ((x) ? 4 : 6) 174 175 #define LP3972_LDO_VOL_MASK(x) (((x) % 4) ? 0x0f : 0x1f) 176 #define LP3972_LDO_VOL_MIN_IDX(x) (((x) == 4) ? 0x05 : 0x00) 177 #define LP3972_LDO_VOL_MAX_IDX(x) ((x) ? (((x) == 4) ? 0x1f : 0x0f) : 0x0c) 178 179 #define LP3972_BUCK_VOL_VALUE_MAP(x) (buck_voltage_map[x]) 180 #define LP3972_BUCK_VOL_ENABLE_REG(x) (buck_vol_enable_addr[x]) 181 #define LP3972_BUCK_VOL1_REG(x) (buck_base_addr[x]) 182 #define LP3972_BUCK_VOL_MASK 0x1f 183 #define LP3972_BUCK_VOL_MIN_IDX(x) ((x) ? 0x01 : 0x00) 184 #define LP3972_BUCK_VOL_MAX_IDX(x) ((x) ? 0x19 : 0x1f) 185 186 static int lp3972_i2c_read(struct i2c_client *i2c, char reg, int count, 187 u16 *dest) 188 { 189 int ret; 190 191 if (count != 1) 192 return -EIO; 193 ret = i2c_smbus_read_byte_data(i2c, reg); 194 if (ret < 0) 195 return ret; 196 197 *dest = ret; 198 return 0; 199 } 200 201 static int lp3972_i2c_write(struct i2c_client *i2c, char reg, int count, 202 const u16 *src) 203 { 204 if (count != 1) 205 return -EIO; 206 return i2c_smbus_write_byte_data(i2c, reg, *src); 207 } 208 209 static u8 lp3972_reg_read(struct lp3972 *lp3972, u8 reg) 210 { 211 u16 val = 0; 212 213 mutex_lock(&lp3972->io_lock); 214 215 lp3972_i2c_read(lp3972->i2c, reg, 1, &val); 216 217 dev_dbg(lp3972->dev, "reg read 0x%02x -> 0x%02x\n", (int)reg, 218 (unsigned)val & 0xff); 219 220 mutex_unlock(&lp3972->io_lock); 221 222 return val & 0xff; 223 } 224 225 static int lp3972_set_bits(struct lp3972 *lp3972, u8 reg, u16 mask, u16 val) 226 { 227 u16 tmp; 228 int ret; 229 230 mutex_lock(&lp3972->io_lock); 231 232 ret = lp3972_i2c_read(lp3972->i2c, reg, 1, &tmp); 233 tmp = (tmp & ~mask) | val; 234 if (ret == 0) { 235 ret = lp3972_i2c_write(lp3972->i2c, reg, 1, &tmp); 236 dev_dbg(lp3972->dev, "reg write 0x%02x -> 0x%02x\n", (int)reg, 237 (unsigned)val & 0xff); 238 } 239 mutex_unlock(&lp3972->io_lock); 240 241 return ret; 242 } 243 244 static int lp3972_ldo_list_voltage(struct regulator_dev *dev, unsigned index) 245 { 246 int ldo = rdev_get_id(dev) - LP3972_LDO1; 247 return 1000 * LP3972_LDO_VOL_VALUE_MAP(ldo)[index]; 248 } 249 250 static int lp3972_ldo_is_enabled(struct regulator_dev *dev) 251 { 252 struct lp3972 *lp3972 = rdev_get_drvdata(dev); 253 int ldo = rdev_get_id(dev) - LP3972_LDO1; 254 u16 mask = LP3972_LDO_OUTPUT_ENABLE_MASK(ldo); 255 u16 val; 256 257 val = lp3972_reg_read(lp3972, LP3972_LDO_OUTPUT_ENABLE_REG(ldo)); 258 return !!(val & mask); 259 } 260 261 static int lp3972_ldo_enable(struct regulator_dev *dev) 262 { 263 struct lp3972 *lp3972 = rdev_get_drvdata(dev); 264 int ldo = rdev_get_id(dev) - LP3972_LDO1; 265 u16 mask = LP3972_LDO_OUTPUT_ENABLE_MASK(ldo); 266 267 return lp3972_set_bits(lp3972, LP3972_LDO_OUTPUT_ENABLE_REG(ldo), 268 mask, mask); 269 } 270 271 static int lp3972_ldo_disable(struct regulator_dev *dev) 272 { 273 struct lp3972 *lp3972 = rdev_get_drvdata(dev); 274 int ldo = rdev_get_id(dev) - LP3972_LDO1; 275 u16 mask = LP3972_LDO_OUTPUT_ENABLE_MASK(ldo); 276 277 return lp3972_set_bits(lp3972, LP3972_LDO_OUTPUT_ENABLE_REG(ldo), 278 mask, 0); 279 } 280 281 static int lp3972_ldo_get_voltage(struct regulator_dev *dev) 282 { 283 struct lp3972 *lp3972 = rdev_get_drvdata(dev); 284 int ldo = rdev_get_id(dev) - LP3972_LDO1; 285 u16 mask = LP3972_LDO_VOL_MASK(ldo); 286 u16 val, reg; 287 288 reg = lp3972_reg_read(lp3972, LP3972_LDO_VOL_CONTR_REG(ldo)); 289 val = (reg >> LP3972_LDO_VOL_CONTR_SHIFT(ldo)) & mask; 290 291 return 1000 * LP3972_LDO_VOL_VALUE_MAP(ldo)[val]; 292 } 293 294 static int lp3972_ldo_set_voltage(struct regulator_dev *dev, 295 int min_uV, int max_uV, 296 unsigned int *selector) 297 { 298 struct lp3972 *lp3972 = rdev_get_drvdata(dev); 299 int ldo = rdev_get_id(dev) - LP3972_LDO1; 300 int min_vol = min_uV / 1000, max_vol = max_uV / 1000; 301 const int *vol_map = LP3972_LDO_VOL_VALUE_MAP(ldo); 302 u16 val; 303 int shift, ret; 304 305 if (min_vol < vol_map[LP3972_LDO_VOL_MIN_IDX(ldo)] || 306 min_vol > vol_map[LP3972_LDO_VOL_MAX_IDX(ldo)]) 307 return -EINVAL; 308 309 for (val = LP3972_LDO_VOL_MIN_IDX(ldo); 310 val <= LP3972_LDO_VOL_MAX_IDX(ldo); val++) 311 if (vol_map[val] >= min_vol) 312 break; 313 314 if (val > LP3972_LDO_VOL_MAX_IDX(ldo) || vol_map[val] > max_vol) 315 return -EINVAL; 316 317 *selector = val; 318 319 shift = LP3972_LDO_VOL_CONTR_SHIFT(ldo); 320 ret = lp3972_set_bits(lp3972, LP3972_LDO_VOL_CONTR_REG(ldo), 321 LP3972_LDO_VOL_MASK(ldo) << shift, val << shift); 322 323 if (ret) 324 return ret; 325 326 /* 327 * LDO1 and LDO5 support voltage control by either target voltage1 328 * or target voltage2 register. 329 * We use target voltage1 register for LDO1 and LDO5 in this driver. 330 * We need to update voltage change control register(0x20) to enable 331 * LDO1 and LDO5 to change to their programmed target values. 332 */ 333 switch (ldo) { 334 case LP3972_LDO1: 335 case LP3972_LDO5: 336 shift = LP3972_LDO_VOL_CHANGE_SHIFT(ldo); 337 ret = lp3972_set_bits(lp3972, LP3972_VOL_CHANGE_REG, 338 LP3972_VOL_CHANGE_FLAG_MASK << shift, 339 LP3972_VOL_CHANGE_FLAG_GO << shift); 340 if (ret) 341 return ret; 342 343 ret = lp3972_set_bits(lp3972, LP3972_VOL_CHANGE_REG, 344 LP3972_VOL_CHANGE_FLAG_MASK << shift, 0); 345 break; 346 } 347 348 return ret; 349 } 350 351 static struct regulator_ops lp3972_ldo_ops = { 352 .list_voltage = lp3972_ldo_list_voltage, 353 .is_enabled = lp3972_ldo_is_enabled, 354 .enable = lp3972_ldo_enable, 355 .disable = lp3972_ldo_disable, 356 .get_voltage = lp3972_ldo_get_voltage, 357 .set_voltage = lp3972_ldo_set_voltage, 358 }; 359 360 static int lp3972_dcdc_list_voltage(struct regulator_dev *dev, unsigned index) 361 { 362 int buck = rdev_get_id(dev) - LP3972_DCDC1; 363 return 1000 * buck_voltage_map[buck][index]; 364 } 365 366 static int lp3972_dcdc_is_enabled(struct regulator_dev *dev) 367 { 368 struct lp3972 *lp3972 = rdev_get_drvdata(dev); 369 int buck = rdev_get_id(dev) - LP3972_DCDC1; 370 u16 mask = 1 << (buck * 2); 371 u16 val; 372 373 val = lp3972_reg_read(lp3972, LP3972_BUCK_VOL_ENABLE_REG(buck)); 374 return !!(val & mask); 375 } 376 377 static int lp3972_dcdc_enable(struct regulator_dev *dev) 378 { 379 struct lp3972 *lp3972 = rdev_get_drvdata(dev); 380 int buck = rdev_get_id(dev) - LP3972_DCDC1; 381 u16 mask = 1 << (buck * 2); 382 u16 val; 383 384 val = lp3972_set_bits(lp3972, LP3972_BUCK_VOL_ENABLE_REG(buck), 385 mask, mask); 386 return val; 387 } 388 389 static int lp3972_dcdc_disable(struct regulator_dev *dev) 390 { 391 struct lp3972 *lp3972 = rdev_get_drvdata(dev); 392 int buck = rdev_get_id(dev) - LP3972_DCDC1; 393 u16 mask = 1 << (buck * 2); 394 u16 val; 395 396 val = lp3972_set_bits(lp3972, LP3972_BUCK_VOL_ENABLE_REG(buck), 397 mask, 0); 398 return val; 399 } 400 401 static int lp3972_dcdc_get_voltage(struct regulator_dev *dev) 402 { 403 struct lp3972 *lp3972 = rdev_get_drvdata(dev); 404 int buck = rdev_get_id(dev) - LP3972_DCDC1; 405 u16 reg; 406 int val; 407 408 reg = lp3972_reg_read(lp3972, LP3972_BUCK_VOL1_REG(buck)); 409 reg &= LP3972_BUCK_VOL_MASK; 410 if (reg <= LP3972_BUCK_VOL_MAX_IDX(buck)) 411 val = 1000 * buck_voltage_map[buck][reg]; 412 else { 413 val = 0; 414 dev_warn(&dev->dev, "chip reported incorrect voltage value." 415 " reg = %d\n", reg); 416 } 417 418 return val; 419 } 420 421 static int lp3972_dcdc_set_voltage(struct regulator_dev *dev, 422 int min_uV, int max_uV, 423 unsigned int *selector) 424 { 425 struct lp3972 *lp3972 = rdev_get_drvdata(dev); 426 int buck = rdev_get_id(dev) - LP3972_DCDC1; 427 int min_vol = min_uV / 1000, max_vol = max_uV / 1000; 428 const int *vol_map = buck_voltage_map[buck]; 429 u16 val; 430 int ret; 431 432 if (min_vol < vol_map[LP3972_BUCK_VOL_MIN_IDX(buck)] || 433 min_vol > vol_map[LP3972_BUCK_VOL_MAX_IDX(buck)]) 434 return -EINVAL; 435 436 for (val = LP3972_BUCK_VOL_MIN_IDX(buck); 437 val <= LP3972_BUCK_VOL_MAX_IDX(buck); val++) 438 if (vol_map[val] >= min_vol) 439 break; 440 441 if (val > LP3972_BUCK_VOL_MAX_IDX(buck) || 442 vol_map[val] > max_vol) 443 return -EINVAL; 444 445 *selector = val; 446 447 ret = lp3972_set_bits(lp3972, LP3972_BUCK_VOL1_REG(buck), 448 LP3972_BUCK_VOL_MASK, val); 449 if (ret) 450 return ret; 451 452 if (buck != 0) 453 return ret; 454 455 ret = lp3972_set_bits(lp3972, LP3972_VOL_CHANGE_REG, 456 LP3972_VOL_CHANGE_FLAG_MASK, LP3972_VOL_CHANGE_FLAG_GO); 457 if (ret) 458 return ret; 459 460 return lp3972_set_bits(lp3972, LP3972_VOL_CHANGE_REG, 461 LP3972_VOL_CHANGE_FLAG_MASK, 0); 462 } 463 464 static struct regulator_ops lp3972_dcdc_ops = { 465 .list_voltage = lp3972_dcdc_list_voltage, 466 .is_enabled = lp3972_dcdc_is_enabled, 467 .enable = lp3972_dcdc_enable, 468 .disable = lp3972_dcdc_disable, 469 .get_voltage = lp3972_dcdc_get_voltage, 470 .set_voltage = lp3972_dcdc_set_voltage, 471 }; 472 473 static struct regulator_desc regulators[] = { 474 { 475 .name = "LDO1", 476 .id = LP3972_LDO1, 477 .ops = &lp3972_ldo_ops, 478 .n_voltages = ARRAY_SIZE(ldo1_voltage_map), 479 .type = REGULATOR_VOLTAGE, 480 .owner = THIS_MODULE, 481 }, 482 { 483 .name = "LDO2", 484 .id = LP3972_LDO2, 485 .ops = &lp3972_ldo_ops, 486 .n_voltages = ARRAY_SIZE(ldo23_voltage_map), 487 .type = REGULATOR_VOLTAGE, 488 .owner = THIS_MODULE, 489 }, 490 { 491 .name = "LDO3", 492 .id = LP3972_LDO3, 493 .ops = &lp3972_ldo_ops, 494 .n_voltages = ARRAY_SIZE(ldo23_voltage_map), 495 .type = REGULATOR_VOLTAGE, 496 .owner = THIS_MODULE, 497 }, 498 { 499 .name = "LDO4", 500 .id = LP3972_LDO4, 501 .ops = &lp3972_ldo_ops, 502 .n_voltages = ARRAY_SIZE(ldo4_voltage_map), 503 .type = REGULATOR_VOLTAGE, 504 .owner = THIS_MODULE, 505 }, 506 { 507 .name = "LDO5", 508 .id = LP3972_LDO5, 509 .ops = &lp3972_ldo_ops, 510 .n_voltages = ARRAY_SIZE(ldo5_voltage_map), 511 .type = REGULATOR_VOLTAGE, 512 .owner = THIS_MODULE, 513 }, 514 { 515 .name = "DCDC1", 516 .id = LP3972_DCDC1, 517 .ops = &lp3972_dcdc_ops, 518 .n_voltages = ARRAY_SIZE(buck1_voltage_map), 519 .type = REGULATOR_VOLTAGE, 520 .owner = THIS_MODULE, 521 }, 522 { 523 .name = "DCDC2", 524 .id = LP3972_DCDC2, 525 .ops = &lp3972_dcdc_ops, 526 .n_voltages = ARRAY_SIZE(buck23_voltage_map), 527 .type = REGULATOR_VOLTAGE, 528 .owner = THIS_MODULE, 529 }, 530 { 531 .name = "DCDC3", 532 .id = LP3972_DCDC3, 533 .ops = &lp3972_dcdc_ops, 534 .n_voltages = ARRAY_SIZE(buck23_voltage_map), 535 .type = REGULATOR_VOLTAGE, 536 .owner = THIS_MODULE, 537 }, 538 }; 539 540 static int __devinit setup_regulators(struct lp3972 *lp3972, 541 struct lp3972_platform_data *pdata) 542 { 543 int i, err; 544 545 lp3972->num_regulators = pdata->num_regulators; 546 lp3972->rdev = kcalloc(pdata->num_regulators, 547 sizeof(struct regulator_dev *), GFP_KERNEL); 548 if (!lp3972->rdev) { 549 err = -ENOMEM; 550 goto err_nomem; 551 } 552 553 /* Instantiate the regulators */ 554 for (i = 0; i < pdata->num_regulators; i++) { 555 struct lp3972_regulator_subdev *reg = &pdata->regulators[i]; 556 lp3972->rdev[i] = regulator_register(®ulators[reg->id], 557 lp3972->dev, reg->initdata, lp3972); 558 559 if (IS_ERR(lp3972->rdev[i])) { 560 err = PTR_ERR(lp3972->rdev[i]); 561 dev_err(lp3972->dev, "regulator init failed: %d\n", 562 err); 563 goto error; 564 } 565 } 566 567 return 0; 568 error: 569 while (--i >= 0) 570 regulator_unregister(lp3972->rdev[i]); 571 kfree(lp3972->rdev); 572 lp3972->rdev = NULL; 573 err_nomem: 574 return err; 575 } 576 577 static int __devinit lp3972_i2c_probe(struct i2c_client *i2c, 578 const struct i2c_device_id *id) 579 { 580 struct lp3972 *lp3972; 581 struct lp3972_platform_data *pdata = i2c->dev.platform_data; 582 int ret; 583 u16 val; 584 585 if (!pdata) { 586 dev_dbg(&i2c->dev, "No platform init data supplied\n"); 587 return -ENODEV; 588 } 589 590 lp3972 = kzalloc(sizeof(struct lp3972), GFP_KERNEL); 591 if (!lp3972) 592 return -ENOMEM; 593 594 lp3972->i2c = i2c; 595 lp3972->dev = &i2c->dev; 596 597 mutex_init(&lp3972->io_lock); 598 599 /* Detect LP3972 */ 600 ret = lp3972_i2c_read(i2c, LP3972_SYS_CONTROL1_REG, 1, &val); 601 if (ret == 0 && 602 (val & SYS_CONTROL1_INIT_MASK) != SYS_CONTROL1_INIT_VAL) { 603 ret = -ENODEV; 604 dev_err(&i2c->dev, "chip reported: val = 0x%x\n", val); 605 } 606 if (ret < 0) { 607 dev_err(&i2c->dev, "failed to detect device. ret = %d\n", ret); 608 goto err_detect; 609 } 610 611 ret = setup_regulators(lp3972, pdata); 612 if (ret < 0) 613 goto err_detect; 614 615 i2c_set_clientdata(i2c, lp3972); 616 return 0; 617 618 err_detect: 619 kfree(lp3972); 620 return ret; 621 } 622 623 static int __devexit lp3972_i2c_remove(struct i2c_client *i2c) 624 { 625 struct lp3972 *lp3972 = i2c_get_clientdata(i2c); 626 int i; 627 628 for (i = 0; i < lp3972->num_regulators; i++) 629 regulator_unregister(lp3972->rdev[i]); 630 kfree(lp3972->rdev); 631 kfree(lp3972); 632 633 return 0; 634 } 635 636 static const struct i2c_device_id lp3972_i2c_id[] = { 637 { "lp3972", 0 }, 638 { } 639 }; 640 MODULE_DEVICE_TABLE(i2c, lp3972_i2c_id); 641 642 static struct i2c_driver lp3972_i2c_driver = { 643 .driver = { 644 .name = "lp3972", 645 .owner = THIS_MODULE, 646 }, 647 .probe = lp3972_i2c_probe, 648 .remove = __devexit_p(lp3972_i2c_remove), 649 .id_table = lp3972_i2c_id, 650 }; 651 652 static int __init lp3972_module_init(void) 653 { 654 return i2c_add_driver(&lp3972_i2c_driver); 655 } 656 subsys_initcall(lp3972_module_init); 657 658 static void __exit lp3972_module_exit(void) 659 { 660 i2c_del_driver(&lp3972_i2c_driver); 661 } 662 module_exit(lp3972_module_exit); 663 664 MODULE_LICENSE("GPL"); 665 MODULE_AUTHOR("Axel Lin <axel.lin@gmail.com>"); 666 MODULE_DESCRIPTION("LP3972 PMIC driver"); 667