| 1 | // SPDX-License-Identifier: GPL-2.0 |
| 2 | /* |
| 3 | * Device driver for regulators in MAX5970 and MAX5978 IC |
| 4 | * |
| 5 | * Copyright (c) 2022 9elements GmbH |
| 6 | * |
| 7 | * Author: Patrick Rudolph <patrick.rudolph@9elements.com> |
| 8 | */ |
| 9 | |
| 10 | #include <linux/bitops.h> |
| 11 | #include <linux/device.h> |
| 12 | #include <linux/err.h> |
| 13 | #include <linux/hwmon.h> |
| 14 | #include <linux/module.h> |
| 15 | #include <linux/io.h> |
| 16 | #include <linux/of.h> |
| 17 | #include <linux/i2c.h> |
| 18 | #include <linux/regmap.h> |
| 19 | #include <linux/regulator/driver.h> |
| 20 | #include <linux/regulator/machine.h> |
| 21 | #include <linux/regulator/of_regulator.h> |
| 22 | #include <linux/platform_device.h> |
| 23 | |
| 24 | #include <linux/mfd/max5970.h> |
| 25 | |
| 26 | struct max5970_regulator { |
| 27 | int num_switches, mon_rng, irng, shunt_micro_ohms, lim_uA; |
| 28 | struct regmap *regmap; |
| 29 | }; |
| 30 | |
| 31 | enum max597x_regulator_id { |
| 32 | MAX597X_sw0, |
| 33 | MAX597X_sw1, |
| 34 | }; |
| 35 | |
| 36 | static int max5970_read_adc(struct regmap *regmap, int reg, long *val) |
| 37 | { |
| 38 | u8 reg_data[2]; |
| 39 | int ret; |
| 40 | |
| 41 | ret = regmap_bulk_read(regmap, reg, ®_data[0], 2); |
| 42 | if (ret < 0) |
| 43 | return ret; |
| 44 | |
| 45 | *val = (reg_data[0] << 2) | (reg_data[1] & 3); |
| 46 | |
| 47 | return 0; |
| 48 | } |
| 49 | |
| 50 | static int max5970_read(struct device *dev, enum hwmon_sensor_types type, |
| 51 | u32 attr, int channel, long *val) |
| 52 | { |
| 53 | struct regulator_dev **rdevs = dev_get_drvdata(dev); |
| 54 | struct max5970_regulator *ddata = rdev_get_drvdata(rdevs[channel]); |
| 55 | struct regmap *regmap = ddata->regmap; |
| 56 | int ret; |
| 57 | |
| 58 | switch (type) { |
| 59 | case hwmon_curr: |
| 60 | switch (attr) { |
| 61 | case hwmon_curr_input: |
| 62 | ret = max5970_read_adc(regmap, MAX5970_REG_CURRENT_H(channel), val); |
| 63 | if (ret < 0) |
| 64 | return ret; |
| 65 | /* |
| 66 | * Calculate current from ADC value, IRNG range & shunt resistor value. |
| 67 | * ddata->irng holds the voltage corresponding to the maximum value the |
| 68 | * 10-bit ADC can measure. |
| 69 | * To obtain the output, multiply the ADC value by the IRNG range (in |
| 70 | * millivolts) and then divide it by the maximum value of the 10-bit ADC. |
| 71 | */ |
| 72 | *val = (*val * ddata->irng) >> 10; |
| 73 | /* Convert the voltage meansurement across shunt resistor to current */ |
| 74 | *val = (*val * 1000) / ddata->shunt_micro_ohms; |
| 75 | return 0; |
| 76 | default: |
| 77 | return -EOPNOTSUPP; |
| 78 | } |
| 79 | |
| 80 | case hwmon_in: |
| 81 | switch (attr) { |
| 82 | case hwmon_in_input: |
| 83 | ret = max5970_read_adc(regmap, MAX5970_REG_VOLTAGE_H(channel), val); |
| 84 | if (ret < 0) |
| 85 | return ret; |
| 86 | /* |
| 87 | * Calculate voltage from ADC value and MON range. |
| 88 | * ddata->mon_rng holds the voltage corresponding to the maximum value the |
| 89 | * 10-bit ADC can measure. |
| 90 | * To obtain the output, multiply the ADC value by the MON range (in |
| 91 | * microvolts) and then divide it by the maximum value of the 10-bit ADC. |
| 92 | */ |
| 93 | *val = mul_u64_u32_shr(*val, ddata->mon_rng, 10); |
| 94 | /* uV to mV */ |
| 95 | *val = *val / 1000; |
| 96 | return 0; |
| 97 | default: |
| 98 | return -EOPNOTSUPP; |
| 99 | } |
| 100 | default: |
| 101 | return -EOPNOTSUPP; |
| 102 | } |
| 103 | } |
| 104 | |
| 105 | static umode_t max5970_is_visible(const void *data, |
| 106 | enum hwmon_sensor_types type, |
| 107 | u32 attr, int channel) |
| 108 | { |
| 109 | struct regulator_dev **rdevs = (struct regulator_dev **)data; |
| 110 | struct max5970_regulator *ddata; |
| 111 | |
| 112 | if (channel >= MAX5970_NUM_SWITCHES || !rdevs[channel]) |
| 113 | return 0; |
| 114 | |
| 115 | ddata = rdev_get_drvdata(rdevs[channel]); |
| 116 | |
| 117 | if (channel >= ddata->num_switches) |
| 118 | return 0; |
| 119 | |
| 120 | switch (type) { |
| 121 | case hwmon_in: |
| 122 | switch (attr) { |
| 123 | case hwmon_in_input: |
| 124 | return 0444; |
| 125 | default: |
| 126 | break; |
| 127 | } |
| 128 | break; |
| 129 | case hwmon_curr: |
| 130 | switch (attr) { |
| 131 | case hwmon_curr_input: |
| 132 | /* Current measurement requires knowledge of the shunt resistor value. */ |
| 133 | if (ddata->shunt_micro_ohms) |
| 134 | return 0444; |
| 135 | break; |
| 136 | default: |
| 137 | break; |
| 138 | } |
| 139 | break; |
| 140 | default: |
| 141 | break; |
| 142 | } |
| 143 | return 0; |
| 144 | } |
| 145 | |
| 146 | static const struct hwmon_ops max5970_hwmon_ops = { |
| 147 | .is_visible = max5970_is_visible, |
| 148 | .read = max5970_read, |
| 149 | }; |
| 150 | |
| 151 | static const struct hwmon_channel_info *max5970_info[] = { |
| 152 | HWMON_CHANNEL_INFO(in, HWMON_I_INPUT, HWMON_I_INPUT), |
| 153 | HWMON_CHANNEL_INFO(curr, HWMON_C_INPUT, HWMON_C_INPUT), |
| 154 | NULL |
| 155 | }; |
| 156 | |
| 157 | static const struct hwmon_chip_info max5970_chip_info = { |
| 158 | .ops = &max5970_hwmon_ops, |
| 159 | .info = max5970_info, |
| 160 | }; |
| 161 | |
| 162 | static int max597x_uvp_ovp_check_mode(struct regulator_dev *rdev, int severity) |
| 163 | { |
| 164 | int ret, reg; |
| 165 | |
| 166 | /* Status1 register contains the soft strap values sampled at POR */ |
| 167 | ret = regmap_read(rdev->regmap, MAX5970_REG_STATUS1, ®); |
| 168 | if (ret) |
| 169 | return ret; |
| 170 | |
| 171 | /* Check soft straps match requested mode */ |
| 172 | if (severity == REGULATOR_SEVERITY_PROT) { |
| 173 | if (STATUS1_PROT(reg) != STATUS1_PROT_SHUTDOWN) |
| 174 | return -EOPNOTSUPP; |
| 175 | |
| 176 | return 0; |
| 177 | } |
| 178 | if (STATUS1_PROT(reg) == STATUS1_PROT_SHUTDOWN) |
| 179 | return -EOPNOTSUPP; |
| 180 | |
| 181 | return 0; |
| 182 | } |
| 183 | |
| 184 | static int max597x_set_vp(struct regulator_dev *rdev, int lim_uV, int severity, |
| 185 | bool enable, bool overvoltage) |
| 186 | { |
| 187 | int off_h, off_l, reg, ret; |
| 188 | struct max5970_regulator *data = rdev_get_drvdata(rdev); |
| 189 | int channel = rdev_get_id(rdev); |
| 190 | |
| 191 | if (overvoltage) { |
| 192 | if (severity == REGULATOR_SEVERITY_WARN) { |
| 193 | off_h = MAX5970_REG_CH_OV_WARN_H(channel); |
| 194 | off_l = MAX5970_REG_CH_OV_WARN_L(channel); |
| 195 | } else { |
| 196 | off_h = MAX5970_REG_CH_OV_CRIT_H(channel); |
| 197 | off_l = MAX5970_REG_CH_OV_CRIT_L(channel); |
| 198 | } |
| 199 | } else { |
| 200 | if (severity == REGULATOR_SEVERITY_WARN) { |
| 201 | off_h = MAX5970_REG_CH_UV_WARN_H(channel); |
| 202 | off_l = MAX5970_REG_CH_UV_WARN_L(channel); |
| 203 | } else { |
| 204 | off_h = MAX5970_REG_CH_UV_CRIT_H(channel); |
| 205 | off_l = MAX5970_REG_CH_UV_CRIT_L(channel); |
| 206 | } |
| 207 | } |
| 208 | |
| 209 | if (enable) |
| 210 | /* reg = ADC_MASK * (lim_uV / 1000000) / (data->mon_rng / 1000000) */ |
| 211 | reg = ADC_MASK * lim_uV / data->mon_rng; |
| 212 | else |
| 213 | reg = 0; |
| 214 | |
| 215 | ret = regmap_write(rdev->regmap, off_h, MAX5970_VAL2REG_H(reg)); |
| 216 | if (ret) |
| 217 | return ret; |
| 218 | |
| 219 | ret = regmap_write(rdev->regmap, off_l, MAX5970_VAL2REG_L(reg)); |
| 220 | if (ret) |
| 221 | return ret; |
| 222 | |
| 223 | return 0; |
| 224 | } |
| 225 | |
| 226 | static int max597x_set_uvp(struct regulator_dev *rdev, int lim_uV, int severity, |
| 227 | bool enable) |
| 228 | { |
| 229 | int ret; |
| 230 | |
| 231 | /* |
| 232 | * MAX5970 has enable control as a special value in limit reg. Can't |
| 233 | * set limit but keep feature disabled or enable W/O given limit. |
| 234 | */ |
| 235 | if ((lim_uV && !enable) || (!lim_uV && enable)) |
| 236 | return -EINVAL; |
| 237 | |
| 238 | ret = max597x_uvp_ovp_check_mode(rdev, severity); |
| 239 | if (ret) |
| 240 | return ret; |
| 241 | |
| 242 | return max597x_set_vp(rdev, lim_uV, severity, enable, false); |
| 243 | } |
| 244 | |
| 245 | static int max597x_set_ovp(struct regulator_dev *rdev, int lim_uV, int severity, |
| 246 | bool enable) |
| 247 | { |
| 248 | int ret; |
| 249 | |
| 250 | /* |
| 251 | * MAX5970 has enable control as a special value in limit reg. Can't |
| 252 | * set limit but keep feature disabled or enable W/O given limit. |
| 253 | */ |
| 254 | if ((lim_uV && !enable) || (!lim_uV && enable)) |
| 255 | return -EINVAL; |
| 256 | |
| 257 | ret = max597x_uvp_ovp_check_mode(rdev, severity); |
| 258 | if (ret) |
| 259 | return ret; |
| 260 | |
| 261 | return max597x_set_vp(rdev, lim_uV, severity, enable, true); |
| 262 | } |
| 263 | |
| 264 | static int max597x_set_ocp(struct regulator_dev *rdev, int lim_uA, |
| 265 | int severity, bool enable) |
| 266 | { |
| 267 | int val, reg; |
| 268 | unsigned int vthst, vthfst; |
| 269 | |
| 270 | struct max5970_regulator *data = rdev_get_drvdata(rdev); |
| 271 | int rdev_id = rdev_get_id(rdev); |
| 272 | /* |
| 273 | * MAX5970 doesn't has enable control for ocp. |
| 274 | * If limit is specified but enable is not set then hold the value in |
| 275 | * variable & later use it when ocp needs to be enabled. |
| 276 | */ |
| 277 | if (lim_uA != 0 && lim_uA != data->lim_uA) |
| 278 | data->lim_uA = lim_uA; |
| 279 | |
| 280 | if (severity != REGULATOR_SEVERITY_PROT) |
| 281 | return -EINVAL; |
| 282 | |
| 283 | if (enable) { |
| 284 | |
| 285 | /* Calc Vtrip threshold in uV. */ |
| 286 | vthst = |
| 287 | div_u64(mul_u32_u32(data->shunt_micro_ohms, data->lim_uA), |
| 288 | 1000000); |
| 289 | |
| 290 | /* |
| 291 | * As recommended in datasheed, add 20% margin to avoid |
| 292 | * spurious event & passive component tolerance. |
| 293 | */ |
| 294 | vthst = div_u64(mul_u32_u32(vthst, 120), 100); |
| 295 | |
| 296 | /* Calc fast Vtrip threshold in uV */ |
| 297 | vthfst = vthst * (MAX5970_FAST2SLOW_RATIO / 100); |
| 298 | |
| 299 | if (vthfst > data->irng) { |
| 300 | dev_err(&rdev->dev, "Current limit out of range\n"); |
| 301 | return -EINVAL; |
| 302 | } |
| 303 | /* Fast trip threshold to be programmed */ |
| 304 | val = div_u64(mul_u32_u32(0xFF, vthfst), data->irng); |
| 305 | } else |
| 306 | /* |
| 307 | * Since there is no option to disable ocp, set limit to max |
| 308 | * value |
| 309 | */ |
| 310 | val = 0xFF; |
| 311 | |
| 312 | reg = MAX5970_REG_DAC_FAST(rdev_id); |
| 313 | |
| 314 | return regmap_write(rdev->regmap, reg, val); |
| 315 | } |
| 316 | |
| 317 | static int max597x_get_status(struct regulator_dev *rdev) |
| 318 | { |
| 319 | int val, ret; |
| 320 | |
| 321 | ret = regmap_read(rdev->regmap, MAX5970_REG_STATUS3, &val); |
| 322 | if (ret) |
| 323 | return ret; |
| 324 | |
| 325 | if (val & MAX5970_STATUS3_ALERT) |
| 326 | return REGULATOR_STATUS_ERROR; |
| 327 | |
| 328 | ret = regulator_is_enabled_regmap(rdev); |
| 329 | if (ret < 0) |
| 330 | return ret; |
| 331 | |
| 332 | if (ret) |
| 333 | return REGULATOR_STATUS_ON; |
| 334 | |
| 335 | return REGULATOR_STATUS_OFF; |
| 336 | } |
| 337 | |
| 338 | static const struct regulator_ops max597x_switch_ops = { |
| 339 | .enable = regulator_enable_regmap, |
| 340 | .disable = regulator_disable_regmap, |
| 341 | .is_enabled = regulator_is_enabled_regmap, |
| 342 | .get_status = max597x_get_status, |
| 343 | .set_over_voltage_protection = max597x_set_ovp, |
| 344 | .set_under_voltage_protection = max597x_set_uvp, |
| 345 | .set_over_current_protection = max597x_set_ocp, |
| 346 | }; |
| 347 | |
| 348 | static int max597x_dt_parse(struct device_node *np, |
| 349 | const struct regulator_desc *desc, |
| 350 | struct regulator_config *cfg) |
| 351 | { |
| 352 | struct max5970_regulator *data = cfg->driver_data; |
| 353 | int ret = 0; |
| 354 | |
| 355 | ret = |
| 356 | of_property_read_u32(np, "shunt-resistor-micro-ohms", |
| 357 | &data->shunt_micro_ohms); |
| 358 | if (ret < 0) |
| 359 | dev_err(cfg->dev, |
| 360 | "property 'shunt-resistor-micro-ohms' not found, err %d\n", |
| 361 | ret); |
| 362 | return ret; |
| 363 | |
| 364 | } |
| 365 | |
| 366 | #define MAX597X_SWITCH(_ID, _ereg, _chan, _supply) { \ |
| 367 | .name = #_ID, \ |
| 368 | .of_match = of_match_ptr(#_ID), \ |
| 369 | .ops = &max597x_switch_ops, \ |
| 370 | .regulators_node = of_match_ptr("regulators"), \ |
| 371 | .type = REGULATOR_VOLTAGE, \ |
| 372 | .id = MAX597X_##_ID, \ |
| 373 | .owner = THIS_MODULE, \ |
| 374 | .supply_name = _supply, \ |
| 375 | .enable_reg = _ereg, \ |
| 376 | .enable_mask = CHXEN((_chan)), \ |
| 377 | .of_parse_cb = max597x_dt_parse, \ |
| 378 | } |
| 379 | |
| 380 | static const struct regulator_desc regulators[] = { |
| 381 | MAX597X_SWITCH(sw0, MAX5970_REG_CHXEN, 0, "vss1"), |
| 382 | MAX597X_SWITCH(sw1, MAX5970_REG_CHXEN, 1, "vss2"), |
| 383 | }; |
| 384 | |
| 385 | static int max597x_regmap_read_clear(struct regmap *map, unsigned int reg, |
| 386 | unsigned int *val) |
| 387 | { |
| 388 | int ret; |
| 389 | |
| 390 | ret = regmap_read(map, reg, val); |
| 391 | if (ret) |
| 392 | return ret; |
| 393 | |
| 394 | if (*val) |
| 395 | return regmap_write(map, reg, 0); |
| 396 | |
| 397 | return 0; |
| 398 | } |
| 399 | |
| 400 | static int max597x_irq_handler(int irq, struct regulator_irq_data *rid, |
| 401 | unsigned long *dev_mask) |
| 402 | { |
| 403 | struct regulator_err_state *stat; |
| 404 | struct max5970_regulator *d = (struct max5970_regulator *)rid->data; |
| 405 | int val, ret, i; |
| 406 | |
| 407 | ret = max597x_regmap_read_clear(d->regmap, MAX5970_REG_FAULT0, &val); |
| 408 | if (ret) |
| 409 | return REGULATOR_FAILED_RETRY; |
| 410 | |
| 411 | *dev_mask = 0; |
| 412 | for (i = 0; i < d->num_switches; i++) { |
| 413 | stat = &rid->states[i]; |
| 414 | stat->notifs = 0; |
| 415 | stat->errors = 0; |
| 416 | } |
| 417 | |
| 418 | for (i = 0; i < d->num_switches; i++) { |
| 419 | stat = &rid->states[i]; |
| 420 | |
| 421 | if (val & UV_STATUS_CRIT(i)) { |
| 422 | *dev_mask |= 1 << i; |
| 423 | stat->notifs |= REGULATOR_EVENT_UNDER_VOLTAGE; |
| 424 | stat->errors |= REGULATOR_ERROR_UNDER_VOLTAGE; |
| 425 | } else if (val & UV_STATUS_WARN(i)) { |
| 426 | *dev_mask |= 1 << i; |
| 427 | stat->notifs |= REGULATOR_EVENT_UNDER_VOLTAGE_WARN; |
| 428 | stat->errors |= REGULATOR_ERROR_UNDER_VOLTAGE_WARN; |
| 429 | } |
| 430 | } |
| 431 | |
| 432 | ret = max597x_regmap_read_clear(d->regmap, MAX5970_REG_FAULT1, &val); |
| 433 | if (ret) |
| 434 | return REGULATOR_FAILED_RETRY; |
| 435 | |
| 436 | for (i = 0; i < d->num_switches; i++) { |
| 437 | stat = &rid->states[i]; |
| 438 | |
| 439 | if (val & OV_STATUS_CRIT(i)) { |
| 440 | *dev_mask |= 1 << i; |
| 441 | stat->notifs |= REGULATOR_EVENT_REGULATION_OUT; |
| 442 | stat->errors |= REGULATOR_ERROR_REGULATION_OUT; |
| 443 | } else if (val & OV_STATUS_WARN(i)) { |
| 444 | *dev_mask |= 1 << i; |
| 445 | stat->notifs |= REGULATOR_EVENT_OVER_VOLTAGE_WARN; |
| 446 | stat->errors |= REGULATOR_ERROR_OVER_VOLTAGE_WARN; |
| 447 | } |
| 448 | } |
| 449 | |
| 450 | ret = max597x_regmap_read_clear(d->regmap, MAX5970_REG_FAULT2, &val); |
| 451 | if (ret) |
| 452 | return REGULATOR_FAILED_RETRY; |
| 453 | |
| 454 | for (i = 0; i < d->num_switches; i++) { |
| 455 | stat = &rid->states[i]; |
| 456 | |
| 457 | if (val & OC_STATUS_WARN(i)) { |
| 458 | *dev_mask |= 1 << i; |
| 459 | stat->notifs |= REGULATOR_EVENT_OVER_CURRENT_WARN; |
| 460 | stat->errors |= REGULATOR_ERROR_OVER_CURRENT_WARN; |
| 461 | } |
| 462 | } |
| 463 | |
| 464 | ret = regmap_read(d->regmap, MAX5970_REG_STATUS0, &val); |
| 465 | if (ret) |
| 466 | return REGULATOR_FAILED_RETRY; |
| 467 | |
| 468 | for (i = 0; i < d->num_switches; i++) { |
| 469 | stat = &rid->states[i]; |
| 470 | |
| 471 | if ((val & MAX5970_CB_IFAULTF(i)) |
| 472 | || (val & MAX5970_CB_IFAULTS(i))) { |
| 473 | *dev_mask |= 1 << i; |
| 474 | stat->notifs |= |
| 475 | REGULATOR_EVENT_OVER_CURRENT | |
| 476 | REGULATOR_EVENT_DISABLE; |
| 477 | stat->errors |= |
| 478 | REGULATOR_ERROR_OVER_CURRENT | REGULATOR_ERROR_FAIL; |
| 479 | |
| 480 | /* Clear the sub-IRQ status */ |
| 481 | regulator_disable_regmap(stat->rdev); |
| 482 | } |
| 483 | } |
| 484 | return 0; |
| 485 | } |
| 486 | |
| 487 | static int max597x_adc_range(struct regmap *regmap, const int ch, |
| 488 | u32 *irng, u32 *mon_rng) |
| 489 | { |
| 490 | unsigned int reg; |
| 491 | int ret; |
| 492 | |
| 493 | /* Decode current ADC range */ |
| 494 | ret = regmap_read(regmap, MAX5970_REG_STATUS2, ®); |
| 495 | if (ret) |
| 496 | return ret; |
| 497 | switch (MAX5970_IRNG(reg, ch)) { |
| 498 | case 0: |
| 499 | *irng = 100000; /* 100 mV */ |
| 500 | break; |
| 501 | case 1: |
| 502 | *irng = 50000; /* 50 mV */ |
| 503 | break; |
| 504 | case 2: |
| 505 | *irng = 25000; /* 25 mV */ |
| 506 | break; |
| 507 | default: |
| 508 | return -EINVAL; |
| 509 | } |
| 510 | |
| 511 | /* Decode current voltage monitor range */ |
| 512 | ret = regmap_read(regmap, MAX5970_REG_MON_RANGE, ®); |
| 513 | if (ret) |
| 514 | return ret; |
| 515 | |
| 516 | *mon_rng = MAX5970_MON_MAX_RANGE_UV >> MAX5970_MON(reg, ch); |
| 517 | |
| 518 | return 0; |
| 519 | } |
| 520 | |
| 521 | static int max597x_setup_irq(struct device *dev, |
| 522 | int irq, |
| 523 | struct regulator_dev *rdevs[MAX5970_NUM_SWITCHES], |
| 524 | int num_switches, struct max5970_regulator *data) |
| 525 | { |
| 526 | struct regulator_irq_desc max597x_notif = { |
| 527 | .name = "max597x-irq", |
| 528 | .map_event = max597x_irq_handler, |
| 529 | .data = data, |
| 530 | }; |
| 531 | int errs = REGULATOR_ERROR_UNDER_VOLTAGE | |
| 532 | REGULATOR_ERROR_UNDER_VOLTAGE_WARN | |
| 533 | REGULATOR_ERROR_OVER_VOLTAGE_WARN | |
| 534 | REGULATOR_ERROR_REGULATION_OUT | |
| 535 | REGULATOR_ERROR_OVER_CURRENT | |
| 536 | REGULATOR_ERROR_OVER_CURRENT_WARN | REGULATOR_ERROR_FAIL; |
| 537 | void *irq_helper; |
| 538 | |
| 539 | /* Register notifiers - can fail if IRQ is not given */ |
| 540 | irq_helper = devm_regulator_irq_helper(dev, &max597x_notif, |
| 541 | irq, 0, errs, NULL, |
| 542 | &rdevs[0], num_switches); |
| 543 | if (IS_ERR(irq_helper)) { |
| 544 | if (PTR_ERR(irq_helper) == -EPROBE_DEFER) |
| 545 | return -EPROBE_DEFER; |
| 546 | |
| 547 | dev_warn(dev, "IRQ disabled %pe\n", irq_helper); |
| 548 | } |
| 549 | |
| 550 | return 0; |
| 551 | } |
| 552 | |
| 553 | static int max597x_regulator_probe(struct platform_device *pdev) |
| 554 | { |
| 555 | struct max5970_data *max597x; |
| 556 | struct regmap *regmap = dev_get_regmap(pdev->dev.parent, NULL); |
| 557 | struct max5970_regulator *data; |
| 558 | struct i2c_client *i2c = to_i2c_client(pdev->dev.parent); |
| 559 | struct regulator_config config = { }; |
| 560 | struct regulator_dev *rdev; |
| 561 | struct regulator_dev **rdevs = NULL; |
| 562 | struct device *hwmon_dev; |
| 563 | int num_switches; |
| 564 | int ret, i; |
| 565 | |
| 566 | if (!regmap) |
| 567 | return -EPROBE_DEFER; |
| 568 | |
| 569 | max597x = devm_kzalloc(&i2c->dev, sizeof(struct max5970_data), GFP_KERNEL); |
| 570 | if (!max597x) |
| 571 | return -ENOMEM; |
| 572 | |
| 573 | rdevs = devm_kcalloc(&i2c->dev, MAX5970_NUM_SWITCHES, sizeof(struct regulator_dev *), |
| 574 | GFP_KERNEL); |
| 575 | if (!rdevs) |
| 576 | return -ENOMEM; |
| 577 | |
| 578 | i2c_set_clientdata(i2c, max597x); |
| 579 | |
| 580 | if (of_device_is_compatible(i2c->dev.of_node, "maxim,max5978")) |
| 581 | max597x->num_switches = MAX5978_NUM_SWITCHES; |
| 582 | else if (of_device_is_compatible(i2c->dev.of_node, "maxim,max5970")) |
| 583 | max597x->num_switches = MAX5970_NUM_SWITCHES; |
| 584 | else |
| 585 | return -ENODEV; |
| 586 | |
| 587 | num_switches = max597x->num_switches; |
| 588 | |
| 589 | for (i = 0; i < num_switches; i++) { |
| 590 | data = |
| 591 | devm_kzalloc(&i2c->dev, sizeof(struct max5970_regulator), |
| 592 | GFP_KERNEL); |
| 593 | if (!data) |
| 594 | return -ENOMEM; |
| 595 | |
| 596 | data->num_switches = num_switches; |
| 597 | data->regmap = regmap; |
| 598 | |
| 599 | ret = max597x_adc_range(regmap, i, &max597x->irng[i], &max597x->mon_rng[i]); |
| 600 | if (ret < 0) |
| 601 | return ret; |
| 602 | |
| 603 | data->irng = max597x->irng[i]; |
| 604 | data->mon_rng = max597x->mon_rng[i]; |
| 605 | |
| 606 | config.dev = &i2c->dev; |
| 607 | config.driver_data = (void *)data; |
| 608 | config.regmap = data->regmap; |
| 609 | rdev = devm_regulator_register(&i2c->dev, |
| 610 | ®ulators[i], &config); |
| 611 | if (IS_ERR(rdev)) { |
| 612 | dev_err(&i2c->dev, "failed to register regulator %s\n", |
| 613 | regulators[i].name); |
| 614 | return PTR_ERR(rdev); |
| 615 | } |
| 616 | rdevs[i] = rdev; |
| 617 | max597x->shunt_micro_ohms[i] = data->shunt_micro_ohms; |
| 618 | } |
| 619 | |
| 620 | if (IS_REACHABLE(CONFIG_HWMON)) { |
| 621 | hwmon_dev = devm_hwmon_device_register_with_info(&i2c->dev, "max5970", rdevs, |
| 622 | &max5970_chip_info, NULL); |
| 623 | if (IS_ERR(hwmon_dev)) { |
| 624 | return dev_err_probe(&i2c->dev, PTR_ERR(hwmon_dev), |
| 625 | "Unable to register hwmon device\n"); |
| 626 | } |
| 627 | } |
| 628 | |
| 629 | if (i2c->irq) { |
| 630 | ret = |
| 631 | max597x_setup_irq(&i2c->dev, i2c->irq, rdevs, num_switches, |
| 632 | data); |
| 633 | if (ret) { |
| 634 | dev_err(&i2c->dev, "IRQ setup failed"); |
| 635 | return ret; |
| 636 | } |
| 637 | } |
| 638 | |
| 639 | return ret; |
| 640 | } |
| 641 | |
| 642 | static struct platform_driver max597x_regulator_driver = { |
| 643 | .driver = { |
| 644 | .name = "max5970-regulator", |
| 645 | .probe_type = PROBE_PREFER_ASYNCHRONOUS, |
| 646 | }, |
| 647 | .probe = max597x_regulator_probe, |
| 648 | }; |
| 649 | |
| 650 | module_platform_driver(max597x_regulator_driver); |
| 651 | |
| 652 | |
| 653 | MODULE_AUTHOR("Patrick Rudolph <patrick.rudolph@9elements.com>"); |
| 654 | MODULE_DESCRIPTION("MAX5970_hot-swap controller driver"); |
| 655 | MODULE_LICENSE("GPL v2"); |