1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * RTC driver for the MAX31335 4 * 5 * Copyright (C) 2023 Analog Devices 6 * 7 * Antoniu Miclaus <antoniu.miclaus@analog.com> 8 * 9 */ 10 11 #include <linux/unaligned.h> 12 #include <linux/bcd.h> 13 #include <linux/bitfield.h> 14 #include <linux/bitops.h> 15 #include <linux/clk.h> 16 #include <linux/clk-provider.h> 17 #include <linux/hwmon.h> 18 #include <linux/i2c.h> 19 #include <linux/interrupt.h> 20 #include <linux/kernel.h> 21 #include <linux/module.h> 22 #include <linux/of_device.h> 23 #include <linux/regmap.h> 24 #include <linux/rtc.h> 25 #include <linux/util_macros.h> 26 27 /* MAX31335 Register Map */ 28 #define MAX31335_STATUS1 0x00 29 #define MAX31335_INT_EN1 0x01 30 #define MAX31335_STATUS2 0x02 31 #define MAX31335_INT_EN2 0x03 32 #define MAX31335_RTC_RESET 0x04 33 #define MAX31335_RTC_CONFIG 0x05 34 #define MAX31335_RTC_CONFIG2 0x06 35 #define MAX31335_TIMESTAMP_CONFIG 0x07 36 #define MAX31335_TIMER_CONFIG 0x08 37 #define MAX31335_SECONDS_1_128 0x09 38 #define MAX31335_SECONDS 0x0A 39 #define MAX31335_MINUTES 0x0B 40 #define MAX31335_HOURS 0x0C 41 #define MAX31335_DAY 0x0D 42 #define MAX31335_DATE 0x0E 43 #define MAX31335_MONTH 0x0F 44 #define MAX31335_YEAR 0x0F 45 #define MAX31335_ALM1_SEC 0x11 46 #define MAX31335_ALM1_MIN 0x12 47 #define MAX31335_ALM1_HRS 0x13 48 #define MAX31335_ALM1_DAY_DATE 0x14 49 #define MAX31335_ALM1_MON 0x15 50 #define MAX31335_ALM1_YEAR 0x16 51 #define MAX31335_ALM2_MIN 0x17 52 #define MAX31335_ALM2_HRS 0x18 53 #define MAX31335_ALM2_DAY_DATE 0x19 54 #define MAX31335_TIMER_COUNT 0x1A 55 #define MAX31335_TIMER_INIT 0x1B 56 #define MAX31335_PWR_MGMT 0x1C 57 #define MAX31335_TRICKLE_REG 0x1D 58 #define MAX31335_AGING_OFFSET 0x1E 59 #define MAX31335_TS_CONFIG 0x30 60 #define MAX31335_TEMP_ALARM_HIGH_MSB 0x31 61 #define MAX31335_TEMP_ALARM_HIGH_LSB 0x32 62 #define MAX31335_TEMP_ALARM_LOW_MSB 0x33 63 #define MAX31335_TEMP_ALARM_LOW_LSB 0x34 64 #define MAX31335_TEMP_DATA_MSB 0x35 65 #define MAX31335_TEMP_DATA_LSB 0x36 66 #define MAX31335_TS0_SEC_1_128 0x40 67 #define MAX31335_TS0_SEC 0x41 68 #define MAX31335_TS0_MIN 0x42 69 #define MAX31335_TS0_HOUR 0x43 70 #define MAX31335_TS0_DATE 0x44 71 #define MAX31335_TS0_MONTH 0x45 72 #define MAX31335_TS0_YEAR 0x46 73 #define MAX31335_TS0_FLAGS 0x47 74 #define MAX31335_TS1_SEC_1_128 0x48 75 #define MAX31335_TS1_SEC 0x49 76 #define MAX31335_TS1_MIN 0x4A 77 #define MAX31335_TS1_HOUR 0x4B 78 #define MAX31335_TS1_DATE 0x4C 79 #define MAX31335_TS1_MONTH 0x4D 80 #define MAX31335_TS1_YEAR 0x4E 81 #define MAX31335_TS1_FLAGS 0x4F 82 #define MAX31335_TS2_SEC_1_128 0x50 83 #define MAX31335_TS2_SEC 0x51 84 #define MAX31335_TS2_MIN 0x52 85 #define MAX31335_TS2_HOUR 0x53 86 #define MAX31335_TS2_DATE 0x54 87 #define MAX31335_TS2_MONTH 0x55 88 #define MAX31335_TS2_YEAR 0x56 89 #define MAX31335_TS2_FLAGS 0x57 90 #define MAX31335_TS3_SEC_1_128 0x58 91 #define MAX31335_TS3_SEC 0x59 92 #define MAX31335_TS3_MIN 0x5A 93 #define MAX31335_TS3_HOUR 0x5B 94 #define MAX31335_TS3_DATE 0x5C 95 #define MAX31335_TS3_MONTH 0x5D 96 #define MAX31335_TS3_YEAR 0x5E 97 #define MAX31335_TS3_FLAGS 0x5F 98 99 /* MAX31335_STATUS1 Bit Definitions */ 100 #define MAX31335_STATUS1_PSDECT BIT(7) 101 #define MAX31335_STATUS1_OSF BIT(6) 102 #define MAX31335_STATUS1_PFAIL BIT(5) 103 #define MAX31335_STATUS1_VBATLOW BIT(4) 104 #define MAX31335_STATUS1_DIF BIT(3) 105 #define MAX31335_STATUS1_TIF BIT(2) 106 #define MAX31335_STATUS1_A2F BIT(1) 107 #define MAX31335_STATUS1_A1F BIT(0) 108 109 /* MAX31335_INT_EN1 Bit Definitions */ 110 #define MAX31335_INT_EN1_DOSF BIT(6) 111 #define MAX31335_INT_EN1_PFAILE BIT(5) 112 #define MAX31335_INT_EN1_VBATLOWE BIT(4) 113 #define MAX31335_INT_EN1_DIE BIT(3) 114 #define MAX31335_INT_EN1_TIE BIT(2) 115 #define MAX31335_INT_EN1_A2IE BIT(1) 116 #define MAX31335_INT_EN1_A1IE BIT(0) 117 118 /* MAX31335_STATUS2 Bit Definitions */ 119 #define MAX31335_STATUS2_TEMP_RDY BIT(2) 120 #define MAX31335_STATUS2_OTF BIT(1) 121 #define MAX31335_STATUS2_UTF BIT(0) 122 123 /* MAX31335_INT_EN2 Bit Definitions */ 124 #define MAX31335_INT_EN2_TEMP_RDY_EN BIT(2) 125 #define MAX31335_INT_EN2_OTIE BIT(1) 126 #define MAX31335_INT_EN2_UTIE BIT(0) 127 128 /* MAX31335_RTC_RESET Bit Definitions */ 129 #define MAX31335_RTC_RESET_SWRST BIT(0) 130 131 /* MAX31335_RTC_CONFIG1 Bit Definitions */ 132 #define MAX31335_RTC_CONFIG1_EN_IO BIT(6) 133 #define MAX31335_RTC_CONFIG1_A1AC GENMASK(5, 4) 134 #define MAX31335_RTC_CONFIG1_DIP BIT(3) 135 #define MAX31335_RTC_CONFIG1_I2C_TIMEOUT BIT(1) 136 #define MAX31335_RTC_CONFIG1_EN_OSC BIT(0) 137 138 /* MAX31335_RTC_CONFIG2 Bit Definitions */ 139 #define MAX31335_RTC_CONFIG2_ENCLKO BIT(2) 140 #define MAX31335_RTC_CONFIG2_CLKO_HZ GENMASK(1, 0) 141 142 /* MAX31335_TIMESTAMP_CONFIG Bit Definitions */ 143 #define MAX31335_TIMESTAMP_CONFIG_TSVLOW BIT(5) 144 #define MAX31335_TIMESTAMP_CONFIG_TSPWM BIT(4) 145 #define MAX31335_TIMESTAMP_CONFIG_TSDIN BIT(3) 146 #define MAX31335_TIMESTAMP_CONFIG_TSOW BIT(2) 147 #define MAX31335_TIMESTAMP_CONFIG_TSR BIT(1) 148 #define MAX31335_TIMESTAMP_CONFIG_TSE BIT(0) 149 150 /* MAX31335_TIMER_CONFIG Bit Definitions */ 151 #define MAX31335_TIMER_CONFIG_TE BIT(4) 152 #define MAX31335_TIMER_CONFIG_TPAUSE BIT(3) 153 #define MAX31335_TIMER_CONFIG_TRPT BIT(2) 154 #define MAX31335_TIMER_CONFIG_TFS GENMASK(1, 0) 155 156 /* MAX31335_HOURS Bit Definitions */ 157 #define MAX31335_HOURS_F_24_12 BIT(6) 158 #define MAX31335_HOURS_HR_20_AM_PM BIT(5) 159 160 /* MAX31335_MONTH Bit Definitions */ 161 #define MAX31335_MONTH_CENTURY BIT(7) 162 163 /* MAX31335_PWR_MGMT Bit Definitions */ 164 #define MAX31335_PWR_MGMT_PFVT BIT(0) 165 166 /* MAX31335_TRICKLE_REG Bit Definitions */ 167 #define MAX31335_TRICKLE_REG_TRICKLE GENMASK(3, 1) 168 #define MAX31335_TRICKLE_REG_EN_TRICKLE BIT(0) 169 170 /* MAX31335_TS_CONFIG Bit Definitions */ 171 #define MAX31335_TS_CONFIG_AUTO BIT(4) 172 #define MAX31335_TS_CONFIG_CONVERT_T BIT(3) 173 #define MAX31335_TS_CONFIG_TSINT GENMASK(2, 0) 174 175 /* MAX31335_TS_FLAGS Bit Definitions */ 176 #define MAX31335_TS_FLAGS_VLOWF BIT(3) 177 #define MAX31335_TS_FLAGS_VBATF BIT(2) 178 #define MAX31335_TS_FLAGS_VCCF BIT(1) 179 #define MAX31335_TS_FLAGS_DINF BIT(0) 180 181 /* MAX31335 Miscellaneous Definitions */ 182 #define MAX31335_TRICKLE_SCHOTTKY_DIODE 1 183 #define MAX31335_TRICKLE_STANDARD_DIODE 4 184 #define MAX31335_RAM_SIZE 32 185 #define MAX31335_TIME_SIZE 0x07 186 187 #define clk_hw_to_max31335(_hw) container_of(_hw, struct max31335_data, clkout) 188 189 struct max31335_data { 190 struct regmap *regmap; 191 struct rtc_device *rtc; 192 struct clk_hw clkout; 193 }; 194 195 static const int max31335_clkout_freq[] = { 1, 64, 1024, 32768 }; 196 197 static const u16 max31335_trickle_resistors[] = {3000, 6000, 11000}; 198 199 static bool max31335_volatile_reg(struct device *dev, unsigned int reg) 200 { 201 /* time keeping registers */ 202 if (reg >= MAX31335_SECONDS && 203 reg < MAX31335_SECONDS + MAX31335_TIME_SIZE) 204 return true; 205 206 /* interrupt status register */ 207 if (reg == MAX31335_STATUS1) 208 return true; 209 210 /* temperature registers */ 211 if (reg == MAX31335_TEMP_DATA_MSB || reg == MAX31335_TEMP_DATA_LSB) 212 return true; 213 214 return false; 215 } 216 217 static const struct regmap_config regmap_config = { 218 .reg_bits = 8, 219 .val_bits = 8, 220 .max_register = 0x5F, 221 .volatile_reg = max31335_volatile_reg, 222 }; 223 224 static int max31335_read_time(struct device *dev, struct rtc_time *tm) 225 { 226 struct max31335_data *max31335 = dev_get_drvdata(dev); 227 u8 date[7]; 228 int ret; 229 230 ret = regmap_bulk_read(max31335->regmap, MAX31335_SECONDS, date, 231 sizeof(date)); 232 if (ret) 233 return ret; 234 235 tm->tm_sec = bcd2bin(date[0] & 0x7f); 236 tm->tm_min = bcd2bin(date[1] & 0x7f); 237 tm->tm_hour = bcd2bin(date[2] & 0x3f); 238 tm->tm_wday = bcd2bin(date[3] & 0x7) - 1; 239 tm->tm_mday = bcd2bin(date[4] & 0x3f); 240 tm->tm_mon = bcd2bin(date[5] & 0x1f) - 1; 241 tm->tm_year = bcd2bin(date[6]) + 100; 242 243 if (FIELD_GET(MAX31335_MONTH_CENTURY, date[5])) 244 tm->tm_year += 100; 245 246 return 0; 247 } 248 249 static int max31335_set_time(struct device *dev, struct rtc_time *tm) 250 { 251 struct max31335_data *max31335 = dev_get_drvdata(dev); 252 u8 date[7]; 253 254 date[0] = bin2bcd(tm->tm_sec); 255 date[1] = bin2bcd(tm->tm_min); 256 date[2] = bin2bcd(tm->tm_hour); 257 date[3] = bin2bcd(tm->tm_wday + 1); 258 date[4] = bin2bcd(tm->tm_mday); 259 date[5] = bin2bcd(tm->tm_mon + 1); 260 date[6] = bin2bcd(tm->tm_year % 100); 261 262 if (tm->tm_year >= 200) 263 date[5] |= FIELD_PREP(MAX31335_MONTH_CENTURY, 1); 264 265 return regmap_bulk_write(max31335->regmap, MAX31335_SECONDS, date, 266 sizeof(date)); 267 } 268 269 static int max31335_read_alarm(struct device *dev, struct rtc_wkalrm *alrm) 270 { 271 struct max31335_data *max31335 = dev_get_drvdata(dev); 272 int ret, ctrl, status; 273 struct rtc_time time; 274 u8 regs[6]; 275 276 ret = regmap_bulk_read(max31335->regmap, MAX31335_ALM1_SEC, regs, 277 sizeof(regs)); 278 if (ret) 279 return ret; 280 281 alrm->time.tm_sec = bcd2bin(regs[0] & 0x7f); 282 alrm->time.tm_min = bcd2bin(regs[1] & 0x7f); 283 alrm->time.tm_hour = bcd2bin(regs[2] & 0x3f); 284 alrm->time.tm_mday = bcd2bin(regs[3] & 0x3f); 285 alrm->time.tm_mon = bcd2bin(regs[4] & 0x1f) - 1; 286 alrm->time.tm_year = bcd2bin(regs[5]) + 100; 287 288 ret = max31335_read_time(dev, &time); 289 if (ret) 290 return ret; 291 292 if (time.tm_year >= 200) 293 alrm->time.tm_year += 100; 294 295 ret = regmap_read(max31335->regmap, MAX31335_INT_EN1, &ctrl); 296 if (ret) 297 return ret; 298 299 ret = regmap_read(max31335->regmap, MAX31335_STATUS1, &status); 300 if (ret) 301 return ret; 302 303 alrm->enabled = FIELD_GET(MAX31335_INT_EN1_A1IE, ctrl); 304 alrm->pending = FIELD_GET(MAX31335_STATUS1_A1F, status); 305 306 return 0; 307 } 308 309 static int max31335_set_alarm(struct device *dev, struct rtc_wkalrm *alrm) 310 { 311 struct max31335_data *max31335 = dev_get_drvdata(dev); 312 unsigned int reg; 313 u8 regs[6]; 314 int ret; 315 316 regs[0] = bin2bcd(alrm->time.tm_sec); 317 regs[1] = bin2bcd(alrm->time.tm_min); 318 regs[2] = bin2bcd(alrm->time.tm_hour); 319 regs[3] = bin2bcd(alrm->time.tm_mday); 320 regs[4] = bin2bcd(alrm->time.tm_mon + 1); 321 regs[5] = bin2bcd(alrm->time.tm_year % 100); 322 323 ret = regmap_bulk_write(max31335->regmap, MAX31335_ALM1_SEC, 324 regs, sizeof(regs)); 325 if (ret) 326 return ret; 327 328 reg = FIELD_PREP(MAX31335_INT_EN1_A1IE, alrm->enabled); 329 ret = regmap_update_bits(max31335->regmap, MAX31335_INT_EN1, 330 MAX31335_INT_EN1_A1IE, reg); 331 if (ret) 332 return ret; 333 334 ret = regmap_update_bits(max31335->regmap, MAX31335_STATUS1, 335 MAX31335_STATUS1_A1F, 0); 336 337 return 0; 338 } 339 340 static int max31335_alarm_irq_enable(struct device *dev, unsigned int enabled) 341 { 342 struct max31335_data *max31335 = dev_get_drvdata(dev); 343 344 return regmap_update_bits(max31335->regmap, MAX31335_INT_EN1, 345 MAX31335_INT_EN1_A1IE, enabled); 346 } 347 348 static irqreturn_t max31335_handle_irq(int irq, void *dev_id) 349 { 350 struct max31335_data *max31335 = dev_id; 351 bool status; 352 int ret; 353 354 ret = regmap_update_bits_check(max31335->regmap, MAX31335_STATUS1, 355 MAX31335_STATUS1_A1F, 0, &status); 356 if (ret) 357 return IRQ_HANDLED; 358 359 if (status) 360 rtc_update_irq(max31335->rtc, 1, RTC_AF | RTC_IRQF); 361 362 return IRQ_HANDLED; 363 } 364 365 static const struct rtc_class_ops max31335_rtc_ops = { 366 .read_time = max31335_read_time, 367 .set_time = max31335_set_time, 368 .read_alarm = max31335_read_alarm, 369 .set_alarm = max31335_set_alarm, 370 .alarm_irq_enable = max31335_alarm_irq_enable, 371 }; 372 373 static int max31335_trickle_charger_setup(struct device *dev, 374 struct max31335_data *max31335) 375 { 376 u32 ohms, chargeable; 377 int i, trickle_cfg; 378 const char *diode; 379 380 if (device_property_read_u32(dev, "aux-voltage-chargeable", 381 &chargeable)) 382 return 0; 383 384 if (device_property_read_u32(dev, "trickle-resistor-ohms", &ohms)) 385 return 0; 386 387 if (device_property_read_string(dev, "adi,tc-diode", &diode)) 388 return 0; 389 390 if (!strcmp(diode, "schottky")) 391 trickle_cfg = MAX31335_TRICKLE_SCHOTTKY_DIODE; 392 else if (!strcmp(diode, "standard+schottky")) 393 trickle_cfg = MAX31335_TRICKLE_STANDARD_DIODE; 394 else 395 return dev_err_probe(dev, -EINVAL, 396 "Invalid tc-diode value: %s\n", diode); 397 398 for (i = 0; i < ARRAY_SIZE(max31335_trickle_resistors); i++) 399 if (ohms == max31335_trickle_resistors[i]) 400 break; 401 402 if (i >= ARRAY_SIZE(max31335_trickle_resistors)) 403 return 0; 404 405 i = i + trickle_cfg; 406 407 return regmap_write(max31335->regmap, MAX31335_TRICKLE_REG, 408 FIELD_PREP(MAX31335_TRICKLE_REG_TRICKLE, i) | 409 FIELD_PREP(MAX31335_TRICKLE_REG_EN_TRICKLE, 410 chargeable)); 411 } 412 413 static unsigned long max31335_clkout_recalc_rate(struct clk_hw *hw, 414 unsigned long parent_rate) 415 { 416 struct max31335_data *max31335 = clk_hw_to_max31335(hw); 417 unsigned int freq_mask; 418 unsigned int reg; 419 int ret; 420 421 ret = regmap_read(max31335->regmap, MAX31335_RTC_CONFIG2, ®); 422 if (ret) 423 return 0; 424 425 freq_mask = __roundup_pow_of_two(ARRAY_SIZE(max31335_clkout_freq)) - 1; 426 427 return max31335_clkout_freq[reg & freq_mask]; 428 } 429 430 static long max31335_clkout_round_rate(struct clk_hw *hw, unsigned long rate, 431 unsigned long *prate) 432 { 433 int index; 434 435 index = find_closest(rate, max31335_clkout_freq, 436 ARRAY_SIZE(max31335_clkout_freq)); 437 438 return max31335_clkout_freq[index]; 439 } 440 441 static int max31335_clkout_set_rate(struct clk_hw *hw, unsigned long rate, 442 unsigned long parent_rate) 443 { 444 struct max31335_data *max31335 = clk_hw_to_max31335(hw); 445 unsigned int freq_mask; 446 int index; 447 448 index = find_closest(rate, max31335_clkout_freq, 449 ARRAY_SIZE(max31335_clkout_freq)); 450 freq_mask = __roundup_pow_of_two(ARRAY_SIZE(max31335_clkout_freq)) - 1; 451 452 return regmap_update_bits(max31335->regmap, MAX31335_RTC_CONFIG2, 453 freq_mask, index); 454 } 455 456 static int max31335_clkout_enable(struct clk_hw *hw) 457 { 458 struct max31335_data *max31335 = clk_hw_to_max31335(hw); 459 460 return regmap_set_bits(max31335->regmap, MAX31335_RTC_CONFIG2, 461 MAX31335_RTC_CONFIG2_ENCLKO); 462 } 463 464 static void max31335_clkout_disable(struct clk_hw *hw) 465 { 466 struct max31335_data *max31335 = clk_hw_to_max31335(hw); 467 468 regmap_clear_bits(max31335->regmap, MAX31335_RTC_CONFIG2, 469 MAX31335_RTC_CONFIG2_ENCLKO); 470 } 471 472 static int max31335_clkout_is_enabled(struct clk_hw *hw) 473 { 474 struct max31335_data *max31335 = clk_hw_to_max31335(hw); 475 unsigned int reg; 476 int ret; 477 478 ret = regmap_read(max31335->regmap, MAX31335_RTC_CONFIG2, ®); 479 if (ret) 480 return ret; 481 482 return !!(reg & MAX31335_RTC_CONFIG2_ENCLKO); 483 } 484 485 static const struct clk_ops max31335_clkout_ops = { 486 .recalc_rate = max31335_clkout_recalc_rate, 487 .round_rate = max31335_clkout_round_rate, 488 .set_rate = max31335_clkout_set_rate, 489 .enable = max31335_clkout_enable, 490 .disable = max31335_clkout_disable, 491 .is_enabled = max31335_clkout_is_enabled, 492 }; 493 494 static struct clk_init_data max31335_clk_init = { 495 .name = "max31335-clkout", 496 .ops = &max31335_clkout_ops, 497 }; 498 499 static int max31335_nvmem_reg_read(void *priv, unsigned int offset, 500 void *val, size_t bytes) 501 { 502 struct max31335_data *max31335 = priv; 503 unsigned int reg = MAX31335_TS0_SEC_1_128 + offset; 504 505 return regmap_bulk_read(max31335->regmap, reg, val, bytes); 506 } 507 508 static int max31335_nvmem_reg_write(void *priv, unsigned int offset, 509 void *val, size_t bytes) 510 { 511 struct max31335_data *max31335 = priv; 512 unsigned int reg = MAX31335_TS0_SEC_1_128 + offset; 513 514 return regmap_bulk_write(max31335->regmap, reg, val, bytes); 515 } 516 517 static struct nvmem_config max31335_nvmem_cfg = { 518 .reg_read = max31335_nvmem_reg_read, 519 .reg_write = max31335_nvmem_reg_write, 520 .word_size = 8, 521 .size = MAX31335_RAM_SIZE, 522 }; 523 524 #if IS_REACHABLE(HWMON) 525 static int max31335_read_temp(struct device *dev, enum hwmon_sensor_types type, 526 u32 attr, int channel, long *val) 527 { 528 struct max31335_data *max31335 = dev_get_drvdata(dev); 529 u8 reg[2]; 530 s16 temp; 531 int ret; 532 533 if (type != hwmon_temp || attr != hwmon_temp_input) 534 return -EOPNOTSUPP; 535 536 ret = regmap_bulk_read(max31335->regmap, MAX31335_TEMP_DATA_MSB, 537 reg, 2); 538 if (ret) 539 return ret; 540 541 temp = get_unaligned_be16(reg); 542 543 *val = (temp / 64) * 250; 544 545 return 0; 546 } 547 548 static umode_t max31335_is_visible(const void *data, 549 enum hwmon_sensor_types type, 550 u32 attr, int channel) 551 { 552 if (type == hwmon_temp && attr == hwmon_temp_input) 553 return 0444; 554 555 return 0; 556 } 557 558 static const struct hwmon_channel_info *max31335_info[] = { 559 HWMON_CHANNEL_INFO(temp, HWMON_T_INPUT), 560 NULL 561 }; 562 563 static const struct hwmon_ops max31335_hwmon_ops = { 564 .is_visible = max31335_is_visible, 565 .read = max31335_read_temp, 566 }; 567 568 static const struct hwmon_chip_info max31335_chip_info = { 569 .ops = &max31335_hwmon_ops, 570 .info = max31335_info, 571 }; 572 #endif 573 574 static int max31335_clkout_register(struct device *dev) 575 { 576 struct max31335_data *max31335 = dev_get_drvdata(dev); 577 int ret; 578 579 if (!device_property_present(dev, "#clock-cells")) 580 return regmap_clear_bits(max31335->regmap, MAX31335_RTC_CONFIG2, 581 MAX31335_RTC_CONFIG2_ENCLKO); 582 583 max31335->clkout.init = &max31335_clk_init; 584 585 ret = devm_clk_hw_register(dev, &max31335->clkout); 586 if (ret) 587 return dev_err_probe(dev, ret, "cannot register clock\n"); 588 589 ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get, 590 &max31335->clkout); 591 if (ret) 592 return dev_err_probe(dev, ret, "cannot add hw provider\n"); 593 594 max31335->clkout.clk = devm_clk_get_enabled(dev, NULL); 595 if (IS_ERR(max31335->clkout.clk)) 596 return dev_err_probe(dev, PTR_ERR(max31335->clkout.clk), 597 "cannot enable clkout\n"); 598 599 return 0; 600 } 601 602 static int max31335_probe(struct i2c_client *client) 603 { 604 struct max31335_data *max31335; 605 #if IS_REACHABLE(HWMON) 606 struct device *hwmon; 607 #endif 608 int ret; 609 610 max31335 = devm_kzalloc(&client->dev, sizeof(*max31335), GFP_KERNEL); 611 if (!max31335) 612 return -ENOMEM; 613 614 max31335->regmap = devm_regmap_init_i2c(client, ®map_config); 615 if (IS_ERR(max31335->regmap)) 616 return PTR_ERR(max31335->regmap); 617 618 i2c_set_clientdata(client, max31335); 619 620 max31335->rtc = devm_rtc_allocate_device(&client->dev); 621 if (IS_ERR(max31335->rtc)) 622 return PTR_ERR(max31335->rtc); 623 624 max31335->rtc->ops = &max31335_rtc_ops; 625 max31335->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000; 626 max31335->rtc->range_max = RTC_TIMESTAMP_END_2199; 627 max31335->rtc->alarm_offset_max = 24 * 60 * 60; 628 629 ret = max31335_clkout_register(&client->dev); 630 if (ret) 631 return ret; 632 633 if (client->irq > 0) { 634 ret = devm_request_threaded_irq(&client->dev, client->irq, 635 NULL, max31335_handle_irq, 636 IRQF_ONESHOT, 637 "max31335", max31335); 638 if (ret) { 639 dev_warn(&client->dev, 640 "unable to request IRQ, alarm max31335 disabled\n"); 641 client->irq = 0; 642 } 643 } 644 645 if (!client->irq) 646 clear_bit(RTC_FEATURE_ALARM, max31335->rtc->features); 647 648 max31335_nvmem_cfg.priv = max31335; 649 ret = devm_rtc_nvmem_register(max31335->rtc, &max31335_nvmem_cfg); 650 if (ret) 651 return dev_err_probe(&client->dev, ret, 652 "cannot register rtc nvmem\n"); 653 654 #if IS_REACHABLE(HWMON) 655 hwmon = devm_hwmon_device_register_with_info(&client->dev, client->name, 656 max31335, 657 &max31335_chip_info, 658 NULL); 659 if (IS_ERR(hwmon)) 660 return dev_err_probe(&client->dev, PTR_ERR(hwmon), 661 "cannot register hwmon device\n"); 662 #endif 663 664 ret = max31335_trickle_charger_setup(&client->dev, max31335); 665 if (ret) 666 return ret; 667 668 return devm_rtc_register_device(max31335->rtc); 669 } 670 671 static const struct i2c_device_id max31335_id[] = { 672 { "max31335" }, 673 { } 674 }; 675 676 MODULE_DEVICE_TABLE(i2c, max31335_id); 677 678 static const struct of_device_id max31335_of_match[] = { 679 { .compatible = "adi,max31335" }, 680 { } 681 }; 682 683 MODULE_DEVICE_TABLE(of, max31335_of_match); 684 685 static struct i2c_driver max31335_driver = { 686 .driver = { 687 .name = "rtc-max31335", 688 .of_match_table = max31335_of_match, 689 }, 690 .probe = max31335_probe, 691 .id_table = max31335_id, 692 }; 693 module_i2c_driver(max31335_driver); 694 695 MODULE_AUTHOR("Antoniu Miclaus <antoniu.miclaus@analog.com>"); 696 MODULE_DESCRIPTION("MAX31335 RTC driver"); 697 MODULE_LICENSE("GPL"); 698