1 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) 2 /* 3 * LTC2992 - Dual Wide Range Power Monitor 4 * 5 * Copyright 2020 Analog Devices Inc. 6 */ 7 8 #include <linux/bitfield.h> 9 #include <linux/bitops.h> 10 #include <linux/err.h> 11 #include <linux/gpio/driver.h> 12 #include <linux/hwmon.h> 13 #include <linux/i2c.h> 14 #include <linux/kernel.h> 15 #include <linux/module.h> 16 #include <linux/property.h> 17 #include <linux/regmap.h> 18 19 #define LTC2992_CTRLB 0x01 20 #define LTC2992_FAULT1 0x03 21 #define LTC2992_POWER1 0x05 22 #define LTC2992_POWER1_MAX 0x08 23 #define LTC2992_POWER1_MIN 0x0B 24 #define LTC2992_POWER1_MAX_THRESH 0x0E 25 #define LTC2992_POWER1_MIN_THRESH 0x11 26 #define LTC2992_DSENSE1 0x14 27 #define LTC2992_DSENSE1_MAX 0x16 28 #define LTC2992_DSENSE1_MIN 0x18 29 #define LTC2992_DSENSE1_MAX_THRESH 0x1A 30 #define LTC2992_DSENSE1_MIN_THRESH 0x1C 31 #define LTC2992_SENSE1 0x1E 32 #define LTC2992_SENSE1_MAX 0x20 33 #define LTC2992_SENSE1_MIN 0x22 34 #define LTC2992_SENSE1_MAX_THRESH 0x24 35 #define LTC2992_SENSE1_MIN_THRESH 0x26 36 #define LTC2992_G1 0x28 37 #define LTC2992_G1_MAX 0x2A 38 #define LTC2992_G1_MIN 0x2C 39 #define LTC2992_G1_MAX_THRESH 0x2E 40 #define LTC2992_G1_MIN_THRESH 0x30 41 #define LTC2992_FAULT2 0x35 42 #define LTC2992_G2 0x5A 43 #define LTC2992_G2_MAX 0x5C 44 #define LTC2992_G2_MIN 0x5E 45 #define LTC2992_G2_MAX_THRESH 0x60 46 #define LTC2992_G2_MIN_THRESH 0x62 47 #define LTC2992_G3 0x64 48 #define LTC2992_G3_MAX 0x66 49 #define LTC2992_G3_MIN 0x68 50 #define LTC2992_G3_MAX_THRESH 0x6A 51 #define LTC2992_G3_MIN_THRESH 0x6C 52 #define LTC2992_G4 0x6E 53 #define LTC2992_G4_MAX 0x70 54 #define LTC2992_G4_MIN 0x72 55 #define LTC2992_G4_MAX_THRESH 0x74 56 #define LTC2992_G4_MIN_THRESH 0x76 57 #define LTC2992_FAULT3 0x92 58 #define LTC2992_GPIO_STATUS 0x95 59 #define LTC2992_GPIO_IO_CTRL 0x96 60 #define LTC2992_GPIO_CTRL 0x97 61 62 #define LTC2992_POWER(x) (LTC2992_POWER1 + ((x) * 0x32)) 63 #define LTC2992_POWER_MAX(x) (LTC2992_POWER1_MAX + ((x) * 0x32)) 64 #define LTC2992_POWER_MIN(x) (LTC2992_POWER1_MIN + ((x) * 0x32)) 65 #define LTC2992_POWER_MAX_THRESH(x) (LTC2992_POWER1_MAX_THRESH + ((x) * 0x32)) 66 #define LTC2992_POWER_MIN_THRESH(x) (LTC2992_POWER1_MIN_THRESH + ((x) * 0x32)) 67 #define LTC2992_DSENSE(x) (LTC2992_DSENSE1 + ((x) * 0x32)) 68 #define LTC2992_DSENSE_MAX(x) (LTC2992_DSENSE1_MAX + ((x) * 0x32)) 69 #define LTC2992_DSENSE_MIN(x) (LTC2992_DSENSE1_MIN + ((x) * 0x32)) 70 #define LTC2992_DSENSE_MAX_THRESH(x) (LTC2992_DSENSE1_MAX_THRESH + ((x) * 0x32)) 71 #define LTC2992_DSENSE_MIN_THRESH(x) (LTC2992_DSENSE1_MIN_THRESH + ((x) * 0x32)) 72 #define LTC2992_SENSE(x) (LTC2992_SENSE1 + ((x) * 0x32)) 73 #define LTC2992_SENSE_MAX(x) (LTC2992_SENSE1_MAX + ((x) * 0x32)) 74 #define LTC2992_SENSE_MIN(x) (LTC2992_SENSE1_MIN + ((x) * 0x32)) 75 #define LTC2992_SENSE_MAX_THRESH(x) (LTC2992_SENSE1_MAX_THRESH + ((x) * 0x32)) 76 #define LTC2992_SENSE_MIN_THRESH(x) (LTC2992_SENSE1_MIN_THRESH + ((x) * 0x32)) 77 #define LTC2992_POWER_FAULT(x) (LTC2992_FAULT1 + ((x) * 0x32)) 78 #define LTC2992_SENSE_FAULT(x) (LTC2992_FAULT1 + ((x) * 0x32)) 79 #define LTC2992_DSENSE_FAULT(x) (LTC2992_FAULT1 + ((x) * 0x32)) 80 81 /* CTRLB register bitfields */ 82 #define LTC2992_RESET_HISTORY BIT(3) 83 84 /* FAULT1 FAULT2 registers common bitfields */ 85 #define LTC2992_POWER_FAULT_MSK(x) (BIT(6) << (x)) 86 #define LTC2992_DSENSE_FAULT_MSK(x) (BIT(4) << (x)) 87 #define LTC2992_SENSE_FAULT_MSK(x) (BIT(2) << (x)) 88 89 /* FAULT1 bitfields */ 90 #define LTC2992_GPIO1_FAULT_MSK(x) (BIT(0) << (x)) 91 92 /* FAULT2 bitfields */ 93 #define LTC2992_GPIO2_FAULT_MSK(x) (BIT(0) << (x)) 94 95 /* FAULT3 bitfields */ 96 #define LTC2992_GPIO3_FAULT_MSK(x) (BIT(6) << (x)) 97 #define LTC2992_GPIO4_FAULT_MSK(x) (BIT(4) << (x)) 98 99 #define LTC2992_IADC_NANOV_LSB 12500 100 #define LTC2992_VADC_UV_LSB 25000 101 #define LTC2992_VADC_GPIO_UV_LSB 500 102 103 #define LTC2992_GPIO_NR 4 104 #define LTC2992_GPIO1_BIT 7 105 #define LTC2992_GPIO2_BIT 6 106 #define LTC2992_GPIO3_BIT 0 107 #define LTC2992_GPIO4_BIT 6 108 #define LTC2992_GPIO_BIT(x) (LTC2992_GPIO_NR - (x) - 1) 109 110 struct ltc2992_state { 111 struct i2c_client *client; 112 struct gpio_chip gc; 113 struct mutex gpio_mutex; /* lock for gpio access */ 114 const char *gpio_names[LTC2992_GPIO_NR]; 115 struct regmap *regmap; 116 u32 r_sense_uohm[2]; 117 }; 118 119 struct ltc2992_gpio_regs { 120 u8 data; 121 u8 max; 122 u8 min; 123 u8 max_thresh; 124 u8 min_thresh; 125 u8 alarm; 126 u8 min_alarm_msk; 127 u8 max_alarm_msk; 128 u8 ctrl; 129 u8 ctrl_bit; 130 }; 131 132 static const struct ltc2992_gpio_regs ltc2992_gpio_addr_map[] = { 133 { 134 .data = LTC2992_G1, 135 .max = LTC2992_G1_MAX, 136 .min = LTC2992_G1_MIN, 137 .max_thresh = LTC2992_G1_MAX_THRESH, 138 .min_thresh = LTC2992_G1_MIN_THRESH, 139 .alarm = LTC2992_FAULT1, 140 .min_alarm_msk = LTC2992_GPIO1_FAULT_MSK(0), 141 .max_alarm_msk = LTC2992_GPIO1_FAULT_MSK(1), 142 .ctrl = LTC2992_GPIO_IO_CTRL, 143 .ctrl_bit = LTC2992_GPIO1_BIT, 144 }, 145 { 146 .data = LTC2992_G2, 147 .max = LTC2992_G2_MAX, 148 .min = LTC2992_G2_MIN, 149 .max_thresh = LTC2992_G2_MAX_THRESH, 150 .min_thresh = LTC2992_G2_MIN_THRESH, 151 .alarm = LTC2992_FAULT2, 152 .min_alarm_msk = LTC2992_GPIO2_FAULT_MSK(0), 153 .max_alarm_msk = LTC2992_GPIO2_FAULT_MSK(1), 154 .ctrl = LTC2992_GPIO_IO_CTRL, 155 .ctrl_bit = LTC2992_GPIO2_BIT, 156 }, 157 { 158 .data = LTC2992_G3, 159 .max = LTC2992_G3_MAX, 160 .min = LTC2992_G3_MIN, 161 .max_thresh = LTC2992_G3_MAX_THRESH, 162 .min_thresh = LTC2992_G3_MIN_THRESH, 163 .alarm = LTC2992_FAULT3, 164 .min_alarm_msk = LTC2992_GPIO3_FAULT_MSK(0), 165 .max_alarm_msk = LTC2992_GPIO3_FAULT_MSK(1), 166 .ctrl = LTC2992_GPIO_IO_CTRL, 167 .ctrl_bit = LTC2992_GPIO3_BIT, 168 }, 169 { 170 .data = LTC2992_G4, 171 .max = LTC2992_G4_MAX, 172 .min = LTC2992_G4_MIN, 173 .max_thresh = LTC2992_G4_MAX_THRESH, 174 .min_thresh = LTC2992_G4_MIN_THRESH, 175 .alarm = LTC2992_FAULT3, 176 .min_alarm_msk = LTC2992_GPIO4_FAULT_MSK(0), 177 .max_alarm_msk = LTC2992_GPIO4_FAULT_MSK(1), 178 .ctrl = LTC2992_GPIO_CTRL, 179 .ctrl_bit = LTC2992_GPIO4_BIT, 180 }, 181 }; 182 183 static const char *ltc2992_gpio_names[LTC2992_GPIO_NR] = { 184 "GPIO1", "GPIO2", "GPIO3", "GPIO4", 185 }; 186 187 static int ltc2992_read_reg(struct ltc2992_state *st, u8 addr, const u8 reg_len) 188 { 189 u8 regvals[4]; 190 int val; 191 int ret; 192 int i; 193 194 ret = regmap_bulk_read(st->regmap, addr, regvals, reg_len); 195 if (ret < 0) 196 return ret; 197 198 val = 0; 199 for (i = 0; i < reg_len; i++) 200 val |= regvals[reg_len - i - 1] << (i * 8); 201 202 return val; 203 } 204 205 static int ltc2992_write_reg(struct ltc2992_state *st, u8 addr, const u8 reg_len, u32 val) 206 { 207 u8 regvals[4]; 208 int i; 209 210 for (i = 0; i < reg_len; i++) 211 regvals[reg_len - i - 1] = (val >> (i * 8)) & 0xFF; 212 213 return regmap_bulk_write(st->regmap, addr, regvals, reg_len); 214 } 215 216 static int ltc2992_gpio_get(struct gpio_chip *chip, unsigned int offset) 217 { 218 struct ltc2992_state *st = gpiochip_get_data(chip); 219 unsigned long gpio_status; 220 int reg; 221 222 mutex_lock(&st->gpio_mutex); 223 reg = ltc2992_read_reg(st, LTC2992_GPIO_STATUS, 1); 224 mutex_unlock(&st->gpio_mutex); 225 226 if (reg < 0) 227 return reg; 228 229 gpio_status = reg; 230 231 return !test_bit(LTC2992_GPIO_BIT(offset), &gpio_status); 232 } 233 234 static int ltc2992_gpio_get_multiple(struct gpio_chip *chip, unsigned long *mask, 235 unsigned long *bits) 236 { 237 struct ltc2992_state *st = gpiochip_get_data(chip); 238 unsigned long gpio_status; 239 unsigned int gpio_nr; 240 int reg; 241 242 mutex_lock(&st->gpio_mutex); 243 reg = ltc2992_read_reg(st, LTC2992_GPIO_STATUS, 1); 244 mutex_unlock(&st->gpio_mutex); 245 246 if (reg < 0) 247 return reg; 248 249 gpio_status = reg; 250 251 for_each_set_bit(gpio_nr, mask, LTC2992_GPIO_NR) { 252 if (test_bit(LTC2992_GPIO_BIT(gpio_nr), &gpio_status)) 253 set_bit(gpio_nr, bits); 254 } 255 256 return 0; 257 } 258 259 static void ltc2992_gpio_set(struct gpio_chip *chip, unsigned int offset, int value) 260 { 261 struct ltc2992_state *st = gpiochip_get_data(chip); 262 unsigned long gpio_ctrl; 263 int reg; 264 265 mutex_lock(&st->gpio_mutex); 266 reg = ltc2992_read_reg(st, ltc2992_gpio_addr_map[offset].ctrl, 1); 267 if (reg < 0) { 268 mutex_unlock(&st->gpio_mutex); 269 return; 270 } 271 272 gpio_ctrl = reg; 273 assign_bit(ltc2992_gpio_addr_map[offset].ctrl_bit, &gpio_ctrl, value); 274 275 ltc2992_write_reg(st, ltc2992_gpio_addr_map[offset].ctrl, 1, gpio_ctrl); 276 mutex_unlock(&st->gpio_mutex); 277 } 278 279 static void ltc2992_gpio_set_multiple(struct gpio_chip *chip, unsigned long *mask, 280 unsigned long *bits) 281 { 282 struct ltc2992_state *st = gpiochip_get_data(chip); 283 unsigned long gpio_ctrl_io = 0; 284 unsigned long gpio_ctrl = 0; 285 unsigned int gpio_nr; 286 287 for_each_set_bit(gpio_nr, mask, LTC2992_GPIO_NR) { 288 if (gpio_nr < 3) 289 assign_bit(ltc2992_gpio_addr_map[gpio_nr].ctrl_bit, &gpio_ctrl_io, true); 290 291 if (gpio_nr == 3) 292 assign_bit(ltc2992_gpio_addr_map[gpio_nr].ctrl_bit, &gpio_ctrl, true); 293 } 294 295 mutex_lock(&st->gpio_mutex); 296 ltc2992_write_reg(st, LTC2992_GPIO_IO_CTRL, 1, gpio_ctrl_io); 297 ltc2992_write_reg(st, LTC2992_GPIO_CTRL, 1, gpio_ctrl); 298 mutex_unlock(&st->gpio_mutex); 299 } 300 301 static int ltc2992_config_gpio(struct ltc2992_state *st) 302 { 303 const char *name = dev_name(&st->client->dev); 304 char *gpio_name; 305 int ret; 306 int i; 307 308 ret = ltc2992_write_reg(st, LTC2992_GPIO_IO_CTRL, 1, 0); 309 if (ret < 0) 310 return ret; 311 312 mutex_init(&st->gpio_mutex); 313 314 for (i = 0; i < ARRAY_SIZE(st->gpio_names); i++) { 315 gpio_name = devm_kasprintf(&st->client->dev, GFP_KERNEL, "ltc2992-%x-%s", 316 st->client->addr, ltc2992_gpio_names[i]); 317 if (!gpio_name) 318 return -ENOMEM; 319 320 st->gpio_names[i] = gpio_name; 321 } 322 323 st->gc.label = name; 324 st->gc.parent = &st->client->dev; 325 st->gc.owner = THIS_MODULE; 326 st->gc.can_sleep = true; 327 st->gc.base = -1; 328 st->gc.names = st->gpio_names; 329 st->gc.ngpio = ARRAY_SIZE(st->gpio_names); 330 st->gc.get = ltc2992_gpio_get; 331 st->gc.get_multiple = ltc2992_gpio_get_multiple; 332 st->gc.set = ltc2992_gpio_set; 333 st->gc.set_multiple = ltc2992_gpio_set_multiple; 334 335 ret = devm_gpiochip_add_data(&st->client->dev, &st->gc, st); 336 if (ret) 337 dev_err(&st->client->dev, "GPIO registering failed (%d)\n", ret); 338 339 return ret; 340 } 341 342 static umode_t ltc2992_is_visible(const void *data, enum hwmon_sensor_types type, u32 attr, 343 int channel) 344 { 345 const struct ltc2992_state *st = data; 346 347 switch (type) { 348 case hwmon_chip: 349 switch (attr) { 350 case hwmon_chip_in_reset_history: 351 return 0200; 352 } 353 break; 354 case hwmon_in: 355 switch (attr) { 356 case hwmon_in_input: 357 case hwmon_in_lowest: 358 case hwmon_in_highest: 359 case hwmon_in_min_alarm: 360 case hwmon_in_max_alarm: 361 return 0444; 362 case hwmon_in_min: 363 case hwmon_in_max: 364 return 0644; 365 } 366 break; 367 case hwmon_curr: 368 switch (attr) { 369 case hwmon_curr_input: 370 case hwmon_curr_lowest: 371 case hwmon_curr_highest: 372 case hwmon_curr_min_alarm: 373 case hwmon_curr_max_alarm: 374 if (st->r_sense_uohm[channel]) 375 return 0444; 376 break; 377 case hwmon_curr_min: 378 case hwmon_curr_max: 379 if (st->r_sense_uohm[channel]) 380 return 0644; 381 break; 382 } 383 break; 384 case hwmon_power: 385 switch (attr) { 386 case hwmon_power_input: 387 case hwmon_power_input_lowest: 388 case hwmon_power_input_highest: 389 case hwmon_power_min_alarm: 390 case hwmon_power_max_alarm: 391 if (st->r_sense_uohm[channel]) 392 return 0444; 393 break; 394 case hwmon_power_min: 395 case hwmon_power_max: 396 if (st->r_sense_uohm[channel]) 397 return 0644; 398 break; 399 } 400 break; 401 default: 402 break; 403 } 404 405 return 0; 406 } 407 408 static int ltc2992_get_voltage(struct ltc2992_state *st, u32 reg, u32 scale, long *val) 409 { 410 int reg_val; 411 412 reg_val = ltc2992_read_reg(st, reg, 2); 413 if (reg_val < 0) 414 return reg_val; 415 416 reg_val = reg_val >> 4; 417 *val = DIV_ROUND_CLOSEST(reg_val * scale, 1000); 418 419 return 0; 420 } 421 422 static int ltc2992_set_voltage(struct ltc2992_state *st, u32 reg, u32 scale, long val) 423 { 424 val = DIV_ROUND_CLOSEST(val * 1000, scale); 425 val = val << 4; 426 427 return ltc2992_write_reg(st, reg, 2, val); 428 } 429 430 static int ltc2992_read_gpio_alarm(struct ltc2992_state *st, int nr_gpio, u32 attr, long *val) 431 { 432 int reg_val; 433 u32 mask; 434 435 if (attr == hwmon_in_max_alarm) 436 mask = ltc2992_gpio_addr_map[nr_gpio].max_alarm_msk; 437 else 438 mask = ltc2992_gpio_addr_map[nr_gpio].min_alarm_msk; 439 440 reg_val = ltc2992_read_reg(st, ltc2992_gpio_addr_map[nr_gpio].alarm, 1); 441 if (reg_val < 0) 442 return reg_val; 443 444 *val = !!(reg_val & mask); 445 reg_val &= ~mask; 446 447 return ltc2992_write_reg(st, ltc2992_gpio_addr_map[nr_gpio].alarm, 1, reg_val); 448 } 449 450 static int ltc2992_read_gpios_in(struct device *dev, u32 attr, int nr_gpio, long *val) 451 { 452 struct ltc2992_state *st = dev_get_drvdata(dev); 453 u32 reg; 454 455 switch (attr) { 456 case hwmon_in_input: 457 reg = ltc2992_gpio_addr_map[nr_gpio].data; 458 break; 459 case hwmon_in_lowest: 460 reg = ltc2992_gpio_addr_map[nr_gpio].min; 461 break; 462 case hwmon_in_highest: 463 reg = ltc2992_gpio_addr_map[nr_gpio].max; 464 break; 465 case hwmon_in_min: 466 reg = ltc2992_gpio_addr_map[nr_gpio].min_thresh; 467 break; 468 case hwmon_in_max: 469 reg = ltc2992_gpio_addr_map[nr_gpio].max_thresh; 470 break; 471 case hwmon_in_min_alarm: 472 case hwmon_in_max_alarm: 473 return ltc2992_read_gpio_alarm(st, nr_gpio, attr, val); 474 default: 475 return -EOPNOTSUPP; 476 } 477 478 return ltc2992_get_voltage(st, reg, LTC2992_VADC_GPIO_UV_LSB, val); 479 } 480 481 static int ltc2992_read_in_alarm(struct ltc2992_state *st, int channel, long *val, u32 attr) 482 { 483 int reg_val; 484 u32 mask; 485 486 if (attr == hwmon_in_max_alarm) 487 mask = LTC2992_SENSE_FAULT_MSK(1); 488 else 489 mask = LTC2992_SENSE_FAULT_MSK(0); 490 491 reg_val = ltc2992_read_reg(st, LTC2992_SENSE_FAULT(channel), 1); 492 if (reg_val < 0) 493 return reg_val; 494 495 *val = !!(reg_val & mask); 496 reg_val &= ~mask; 497 498 return ltc2992_write_reg(st, LTC2992_SENSE_FAULT(channel), 1, reg_val); 499 } 500 501 static int ltc2992_read_in(struct device *dev, u32 attr, int channel, long *val) 502 { 503 struct ltc2992_state *st = dev_get_drvdata(dev); 504 u32 reg; 505 506 if (channel > 1) 507 return ltc2992_read_gpios_in(dev, attr, channel - 2, val); 508 509 switch (attr) { 510 case hwmon_in_input: 511 reg = LTC2992_SENSE(channel); 512 break; 513 case hwmon_in_lowest: 514 reg = LTC2992_SENSE_MIN(channel); 515 break; 516 case hwmon_in_highest: 517 reg = LTC2992_SENSE_MAX(channel); 518 break; 519 case hwmon_in_min: 520 reg = LTC2992_SENSE_MIN_THRESH(channel); 521 break; 522 case hwmon_in_max: 523 reg = LTC2992_SENSE_MAX_THRESH(channel); 524 break; 525 case hwmon_in_min_alarm: 526 case hwmon_in_max_alarm: 527 return ltc2992_read_in_alarm(st, channel, val, attr); 528 default: 529 return -EOPNOTSUPP; 530 } 531 532 return ltc2992_get_voltage(st, reg, LTC2992_VADC_UV_LSB, val); 533 } 534 535 static int ltc2992_get_current(struct ltc2992_state *st, u32 reg, u32 channel, long *val) 536 { 537 int reg_val; 538 539 reg_val = ltc2992_read_reg(st, reg, 2); 540 if (reg_val < 0) 541 return reg_val; 542 543 reg_val = reg_val >> 4; 544 *val = DIV_ROUND_CLOSEST(reg_val * LTC2992_IADC_NANOV_LSB, st->r_sense_uohm[channel]); 545 546 return 0; 547 } 548 549 static int ltc2992_set_current(struct ltc2992_state *st, u32 reg, u32 channel, long val) 550 { 551 u32 reg_val; 552 553 reg_val = DIV_ROUND_CLOSEST(val * st->r_sense_uohm[channel], LTC2992_IADC_NANOV_LSB); 554 reg_val = reg_val << 4; 555 556 return ltc2992_write_reg(st, reg, 2, reg_val); 557 } 558 559 static int ltc2992_read_curr_alarm(struct ltc2992_state *st, int channel, long *val, u32 attr) 560 { 561 int reg_val; 562 u32 mask; 563 564 if (attr == hwmon_curr_max_alarm) 565 mask = LTC2992_DSENSE_FAULT_MSK(1); 566 else 567 mask = LTC2992_DSENSE_FAULT_MSK(0); 568 569 reg_val = ltc2992_read_reg(st, LTC2992_DSENSE_FAULT(channel), 1); 570 if (reg_val < 0) 571 return reg_val; 572 573 *val = !!(reg_val & mask); 574 575 reg_val &= ~mask; 576 return ltc2992_write_reg(st, LTC2992_DSENSE_FAULT(channel), 1, reg_val); 577 } 578 579 static int ltc2992_read_curr(struct device *dev, u32 attr, int channel, long *val) 580 { 581 struct ltc2992_state *st = dev_get_drvdata(dev); 582 u32 reg; 583 584 switch (attr) { 585 case hwmon_curr_input: 586 reg = LTC2992_DSENSE(channel); 587 break; 588 case hwmon_curr_lowest: 589 reg = LTC2992_DSENSE_MIN(channel); 590 break; 591 case hwmon_curr_highest: 592 reg = LTC2992_DSENSE_MAX(channel); 593 break; 594 case hwmon_curr_min: 595 reg = LTC2992_DSENSE_MIN_THRESH(channel); 596 break; 597 case hwmon_curr_max: 598 reg = LTC2992_DSENSE_MAX_THRESH(channel); 599 break; 600 case hwmon_curr_min_alarm: 601 case hwmon_curr_max_alarm: 602 return ltc2992_read_curr_alarm(st, channel, val, attr); 603 default: 604 return -EOPNOTSUPP; 605 } 606 607 return ltc2992_get_current(st, reg, channel, val); 608 } 609 610 static int ltc2992_get_power(struct ltc2992_state *st, u32 reg, u32 channel, long *val) 611 { 612 int reg_val; 613 614 reg_val = ltc2992_read_reg(st, reg, 3); 615 if (reg_val < 0) 616 return reg_val; 617 618 *val = mul_u64_u32_div(reg_val, LTC2992_VADC_UV_LSB * LTC2992_IADC_NANOV_LSB, 619 st->r_sense_uohm[channel] * 1000); 620 621 return 0; 622 } 623 624 static int ltc2992_set_power(struct ltc2992_state *st, u32 reg, u32 channel, long val) 625 { 626 u32 reg_val; 627 628 reg_val = mul_u64_u32_div(val, st->r_sense_uohm[channel] * 1000, 629 LTC2992_VADC_UV_LSB * LTC2992_IADC_NANOV_LSB); 630 631 return ltc2992_write_reg(st, reg, 3, reg_val); 632 } 633 634 static int ltc2992_read_power_alarm(struct ltc2992_state *st, int channel, long *val, u32 attr) 635 { 636 int reg_val; 637 u32 mask; 638 639 if (attr == hwmon_power_max_alarm) 640 mask = LTC2992_POWER_FAULT_MSK(1); 641 else 642 mask = LTC2992_POWER_FAULT_MSK(0); 643 644 reg_val = ltc2992_read_reg(st, LTC2992_POWER_FAULT(channel), 1); 645 if (reg_val < 0) 646 return reg_val; 647 648 *val = !!(reg_val & mask); 649 reg_val &= ~mask; 650 651 return ltc2992_write_reg(st, LTC2992_POWER_FAULT(channel), 1, reg_val); 652 } 653 654 static int ltc2992_read_power(struct device *dev, u32 attr, int channel, long *val) 655 { 656 struct ltc2992_state *st = dev_get_drvdata(dev); 657 u32 reg; 658 659 switch (attr) { 660 case hwmon_power_input: 661 reg = LTC2992_POWER(channel); 662 break; 663 case hwmon_power_input_lowest: 664 reg = LTC2992_POWER_MIN(channel); 665 break; 666 case hwmon_power_input_highest: 667 reg = LTC2992_POWER_MAX(channel); 668 break; 669 case hwmon_power_min: 670 reg = LTC2992_POWER_MIN_THRESH(channel); 671 break; 672 case hwmon_power_max: 673 reg = LTC2992_POWER_MAX_THRESH(channel); 674 break; 675 case hwmon_power_min_alarm: 676 case hwmon_power_max_alarm: 677 return ltc2992_read_power_alarm(st, channel, val, attr); 678 default: 679 return -EOPNOTSUPP; 680 } 681 682 return ltc2992_get_power(st, reg, channel, val); 683 } 684 685 static int ltc2992_read(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, 686 long *val) 687 { 688 switch (type) { 689 case hwmon_in: 690 return ltc2992_read_in(dev, attr, channel, val); 691 case hwmon_curr: 692 return ltc2992_read_curr(dev, attr, channel, val); 693 case hwmon_power: 694 return ltc2992_read_power(dev, attr, channel, val); 695 default: 696 return -EOPNOTSUPP; 697 } 698 } 699 700 static int ltc2992_write_curr(struct device *dev, u32 attr, int channel, long val) 701 { 702 struct ltc2992_state *st = dev_get_drvdata(dev); 703 u32 reg; 704 705 switch (attr) { 706 case hwmon_curr_min: 707 reg = LTC2992_DSENSE_MIN_THRESH(channel); 708 break; 709 case hwmon_curr_max: 710 reg = LTC2992_DSENSE_MAX_THRESH(channel); 711 break; 712 default: 713 return -EOPNOTSUPP; 714 } 715 716 return ltc2992_set_current(st, reg, channel, val); 717 } 718 719 static int ltc2992_write_gpios_in(struct device *dev, u32 attr, int nr_gpio, long val) 720 { 721 struct ltc2992_state *st = dev_get_drvdata(dev); 722 u32 reg; 723 724 switch (attr) { 725 case hwmon_in_min: 726 reg = ltc2992_gpio_addr_map[nr_gpio].min_thresh; 727 break; 728 case hwmon_in_max: 729 reg = ltc2992_gpio_addr_map[nr_gpio].max_thresh; 730 break; 731 default: 732 return -EOPNOTSUPP; 733 } 734 735 return ltc2992_set_voltage(st, reg, LTC2992_VADC_GPIO_UV_LSB, val); 736 } 737 738 static int ltc2992_write_in(struct device *dev, u32 attr, int channel, long val) 739 { 740 struct ltc2992_state *st = dev_get_drvdata(dev); 741 u32 reg; 742 743 if (channel > 1) 744 return ltc2992_write_gpios_in(dev, attr, channel - 2, val); 745 746 switch (attr) { 747 case hwmon_in_min: 748 reg = LTC2992_SENSE_MIN_THRESH(channel); 749 break; 750 case hwmon_in_max: 751 reg = LTC2992_SENSE_MAX_THRESH(channel); 752 break; 753 default: 754 return -EOPNOTSUPP; 755 } 756 757 return ltc2992_set_voltage(st, reg, LTC2992_VADC_UV_LSB, val); 758 } 759 760 static int ltc2992_write_power(struct device *dev, u32 attr, int channel, long val) 761 { 762 struct ltc2992_state *st = dev_get_drvdata(dev); 763 u32 reg; 764 765 switch (attr) { 766 case hwmon_power_min: 767 reg = LTC2992_POWER_MIN_THRESH(channel); 768 break; 769 case hwmon_power_max: 770 reg = LTC2992_POWER_MAX_THRESH(channel); 771 break; 772 default: 773 return -EOPNOTSUPP; 774 } 775 776 return ltc2992_set_power(st, reg, channel, val); 777 } 778 779 static int ltc2992_write_chip(struct device *dev, u32 attr, int channel, long val) 780 { 781 struct ltc2992_state *st = dev_get_drvdata(dev); 782 783 switch (attr) { 784 case hwmon_chip_in_reset_history: 785 return regmap_update_bits(st->regmap, LTC2992_CTRLB, LTC2992_RESET_HISTORY, 786 LTC2992_RESET_HISTORY); 787 default: 788 return -EOPNOTSUPP; 789 } 790 } 791 792 static int ltc2992_write(struct device *dev, enum hwmon_sensor_types type, u32 attr, int channel, 793 long val) 794 { 795 switch (type) { 796 case hwmon_chip: 797 return ltc2992_write_chip(dev, attr, channel, val); 798 case hwmon_in: 799 return ltc2992_write_in(dev, attr, channel, val); 800 case hwmon_curr: 801 return ltc2992_write_curr(dev, attr, channel, val); 802 case hwmon_power: 803 return ltc2992_write_power(dev, attr, channel, val); 804 default: 805 return -EOPNOTSUPP; 806 } 807 } 808 809 static const struct hwmon_ops ltc2992_hwmon_ops = { 810 .is_visible = ltc2992_is_visible, 811 .read = ltc2992_read, 812 .write = ltc2992_write, 813 }; 814 815 static const struct hwmon_channel_info * const ltc2992_info[] = { 816 HWMON_CHANNEL_INFO(chip, 817 HWMON_C_IN_RESET_HISTORY), 818 HWMON_CHANNEL_INFO(in, 819 HWMON_I_INPUT | HWMON_I_LOWEST | HWMON_I_HIGHEST | HWMON_I_MIN | 820 HWMON_I_MAX | HWMON_I_MIN_ALARM | HWMON_I_MAX_ALARM, 821 HWMON_I_INPUT | HWMON_I_LOWEST | HWMON_I_HIGHEST | HWMON_I_MIN | 822 HWMON_I_MAX | HWMON_I_MIN_ALARM | HWMON_I_MAX_ALARM, 823 HWMON_I_INPUT | HWMON_I_LOWEST | HWMON_I_HIGHEST | HWMON_I_MIN | 824 HWMON_I_MAX | HWMON_I_MIN_ALARM | HWMON_I_MAX_ALARM, 825 HWMON_I_INPUT | HWMON_I_LOWEST | HWMON_I_HIGHEST | HWMON_I_MIN | 826 HWMON_I_MAX | HWMON_I_MIN_ALARM | HWMON_I_MAX_ALARM, 827 HWMON_I_INPUT | HWMON_I_LOWEST | HWMON_I_HIGHEST | HWMON_I_MIN | 828 HWMON_I_MAX | HWMON_I_MIN_ALARM | HWMON_I_MAX_ALARM, 829 HWMON_I_INPUT | HWMON_I_LOWEST | HWMON_I_HIGHEST | HWMON_I_MIN | 830 HWMON_I_MAX | HWMON_I_MIN_ALARM | HWMON_I_MAX_ALARM), 831 HWMON_CHANNEL_INFO(curr, 832 HWMON_C_INPUT | HWMON_C_LOWEST | HWMON_C_HIGHEST | HWMON_C_MIN | 833 HWMON_C_MAX | HWMON_C_MIN_ALARM | HWMON_C_MAX_ALARM, 834 HWMON_C_INPUT | HWMON_C_LOWEST | HWMON_C_HIGHEST | HWMON_C_MIN | 835 HWMON_C_MAX | HWMON_C_MIN_ALARM | HWMON_C_MAX_ALARM), 836 HWMON_CHANNEL_INFO(power, 837 HWMON_P_INPUT | HWMON_P_INPUT_LOWEST | HWMON_P_INPUT_HIGHEST | 838 HWMON_P_MIN | HWMON_P_MAX | HWMON_P_MIN_ALARM | HWMON_P_MAX_ALARM, 839 HWMON_P_INPUT | HWMON_P_INPUT_LOWEST | HWMON_P_INPUT_HIGHEST | 840 HWMON_P_MIN | HWMON_P_MAX | HWMON_P_MIN_ALARM | HWMON_P_MAX_ALARM), 841 NULL 842 }; 843 844 static const struct hwmon_chip_info ltc2992_chip_info = { 845 .ops = <c2992_hwmon_ops, 846 .info = ltc2992_info, 847 }; 848 849 static const struct regmap_config ltc2992_regmap_config = { 850 .reg_bits = 8, 851 .val_bits = 8, 852 .max_register = 0xE8, 853 }; 854 855 static int ltc2992_parse_dt(struct ltc2992_state *st) 856 { 857 struct fwnode_handle *fwnode; 858 struct fwnode_handle *child; 859 u32 addr; 860 u32 val; 861 int ret; 862 863 fwnode = dev_fwnode(&st->client->dev); 864 865 fwnode_for_each_available_child_node(fwnode, child) { 866 ret = fwnode_property_read_u32(child, "reg", &addr); 867 if (ret < 0) { 868 fwnode_handle_put(child); 869 return ret; 870 } 871 872 if (addr > 1) { 873 fwnode_handle_put(child); 874 return -EINVAL; 875 } 876 877 ret = fwnode_property_read_u32(child, "shunt-resistor-micro-ohms", &val); 878 if (!ret) { 879 if (!val) { 880 fwnode_handle_put(child); 881 return dev_err_probe(&st->client->dev, -EINVAL, 882 "shunt resistor value cannot be zero\n"); 883 } 884 st->r_sense_uohm[addr] = val; 885 } 886 } 887 888 return 0; 889 } 890 891 static int ltc2992_i2c_probe(struct i2c_client *client) 892 { 893 struct device *hwmon_dev; 894 struct ltc2992_state *st; 895 int ret; 896 897 st = devm_kzalloc(&client->dev, sizeof(*st), GFP_KERNEL); 898 if (!st) 899 return -ENOMEM; 900 901 st->client = client; 902 st->regmap = devm_regmap_init_i2c(client, <c2992_regmap_config); 903 if (IS_ERR(st->regmap)) 904 return PTR_ERR(st->regmap); 905 906 ret = ltc2992_parse_dt(st); 907 if (ret < 0) 908 return ret; 909 910 ret = ltc2992_config_gpio(st); 911 if (ret < 0) 912 return ret; 913 914 hwmon_dev = devm_hwmon_device_register_with_info(&client->dev, client->name, st, 915 <c2992_chip_info, NULL); 916 917 return PTR_ERR_OR_ZERO(hwmon_dev); 918 } 919 920 static const struct of_device_id ltc2992_of_match[] = { 921 { .compatible = "adi,ltc2992" }, 922 { } 923 }; 924 MODULE_DEVICE_TABLE(of, ltc2992_of_match); 925 926 static const struct i2c_device_id ltc2992_i2c_id[] = { 927 {"ltc2992"}, 928 {} 929 }; 930 MODULE_DEVICE_TABLE(i2c, ltc2992_i2c_id); 931 932 static struct i2c_driver ltc2992_i2c_driver = { 933 .driver = { 934 .name = "ltc2992", 935 .of_match_table = ltc2992_of_match, 936 }, 937 .probe = ltc2992_i2c_probe, 938 .id_table = ltc2992_i2c_id, 939 }; 940 941 module_i2c_driver(ltc2992_i2c_driver); 942 943 MODULE_AUTHOR("Alexandru Tachici <alexandru.tachici@analog.com>"); 944 MODULE_DESCRIPTION("Hwmon driver for Linear Technology 2992"); 945 MODULE_LICENSE("Dual BSD/GPL"); 946