1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * Copyright (c) 2012 Guenter Roeck <linux@roeck-us.net> 4 * 5 * based on max1668.c 6 * Copyright (c) 2011 David George <david.george@ska.ac.za> 7 */ 8 9 #include <linux/module.h> 10 #include <linux/init.h> 11 #include <linux/slab.h> 12 #include <linux/jiffies.h> 13 #include <linux/i2c.h> 14 #include <linux/hwmon.h> 15 #include <linux/hwmon-sysfs.h> 16 #include <linux/err.h> 17 #include <linux/mutex.h> 18 #include <linux/of_device.h> 19 #include <linux/of.h> 20 21 #include <linux/platform_data/max6697.h> 22 23 enum chips { max6581, max6602, max6622, max6636, max6689, max6693, max6694, 24 max6697, max6698, max6699 }; 25 26 /* Report local sensor as temp1 */ 27 28 static const u8 MAX6697_REG_TEMP[] = { 29 0x07, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x08 }; 30 static const u8 MAX6697_REG_TEMP_EXT[] = { 31 0x57, 0x09, 0x52, 0x53, 0x54, 0x55, 0x56, 0 }; 32 static const u8 MAX6697_REG_MAX[] = { 33 0x17, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x18 }; 34 static const u8 MAX6697_REG_CRIT[] = { 35 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27 }; 36 37 /* 38 * Map device tree / platform data register bit map to chip bit map. 39 * Applies to alert register and over-temperature register. 40 */ 41 #define MAX6697_ALERT_MAP_BITS(reg) ((((reg) & 0x7e) >> 1) | \ 42 (((reg) & 0x01) << 6) | ((reg) & 0x80)) 43 #define MAX6697_OVERT_MAP_BITS(reg) (((reg) >> 1) | (((reg) & 0x01) << 7)) 44 45 #define MAX6697_REG_STAT(n) (0x44 + (n)) 46 47 #define MAX6697_REG_CONFIG 0x41 48 #define MAX6581_CONF_EXTENDED (1 << 1) 49 #define MAX6693_CONF_BETA (1 << 2) 50 #define MAX6697_CONF_RESISTANCE (1 << 3) 51 #define MAX6697_CONF_TIMEOUT (1 << 5) 52 #define MAX6697_REG_ALERT_MASK 0x42 53 #define MAX6697_REG_OVERT_MASK 0x43 54 55 #define MAX6581_REG_RESISTANCE 0x4a 56 #define MAX6581_REG_IDEALITY 0x4b 57 #define MAX6581_REG_IDEALITY_SELECT 0x4c 58 #define MAX6581_REG_OFFSET 0x4d 59 #define MAX6581_REG_OFFSET_SELECT 0x4e 60 #define MAX6581_OFFSET_MIN -31750 61 #define MAX6581_OFFSET_MAX 31750 62 63 #define MAX6697_CONV_TIME 156 /* ms per channel, worst case */ 64 65 struct max6697_chip_data { 66 int channels; 67 u32 have_ext; 68 u32 have_crit; 69 u32 have_fault; 70 u8 valid_conf; 71 const u8 *alarm_map; 72 }; 73 74 struct max6697_data { 75 struct i2c_client *client; 76 77 enum chips type; 78 const struct max6697_chip_data *chip; 79 80 int update_interval; /* in milli-seconds */ 81 int temp_offset; /* in degrees C */ 82 83 struct mutex update_lock; 84 unsigned long last_updated; /* In jiffies */ 85 bool valid; /* true if following fields are valid */ 86 87 /* 1x local and up to 7x remote */ 88 u8 temp[8][4]; /* [nr][0]=temp [1]=ext [2]=max [3]=crit */ 89 #define MAX6697_TEMP_INPUT 0 90 #define MAX6697_TEMP_EXT 1 91 #define MAX6697_TEMP_MAX 2 92 #define MAX6697_TEMP_CRIT 3 93 u32 alarms; 94 }; 95 96 /* Diode fault status bits on MAX6581 are right shifted by one bit */ 97 static const u8 max6581_alarm_map[] = { 98 0, 0, 1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 14, 15, 99 16, 17, 18, 19, 20, 21, 22, 23 }; 100 101 static const struct max6697_chip_data max6697_chip_data[] = { 102 [max6581] = { 103 .channels = 8, 104 .have_crit = 0xff, 105 .have_ext = 0x7f, 106 .have_fault = 0xfe, 107 .valid_conf = MAX6581_CONF_EXTENDED | MAX6697_CONF_TIMEOUT, 108 .alarm_map = max6581_alarm_map, 109 }, 110 [max6602] = { 111 .channels = 5, 112 .have_crit = 0x12, 113 .have_ext = 0x02, 114 .have_fault = 0x1e, 115 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT, 116 }, 117 [max6622] = { 118 .channels = 5, 119 .have_crit = 0x12, 120 .have_ext = 0x02, 121 .have_fault = 0x1e, 122 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT, 123 }, 124 [max6636] = { 125 .channels = 7, 126 .have_crit = 0x72, 127 .have_ext = 0x02, 128 .have_fault = 0x7e, 129 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT, 130 }, 131 [max6689] = { 132 .channels = 7, 133 .have_crit = 0x72, 134 .have_ext = 0x02, 135 .have_fault = 0x7e, 136 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT, 137 }, 138 [max6693] = { 139 .channels = 7, 140 .have_crit = 0x72, 141 .have_ext = 0x02, 142 .have_fault = 0x7e, 143 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6693_CONF_BETA | 144 MAX6697_CONF_TIMEOUT, 145 }, 146 [max6694] = { 147 .channels = 5, 148 .have_crit = 0x12, 149 .have_ext = 0x02, 150 .have_fault = 0x1e, 151 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6693_CONF_BETA | 152 MAX6697_CONF_TIMEOUT, 153 }, 154 [max6697] = { 155 .channels = 7, 156 .have_crit = 0x72, 157 .have_ext = 0x02, 158 .have_fault = 0x7e, 159 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT, 160 }, 161 [max6698] = { 162 .channels = 7, 163 .have_crit = 0x72, 164 .have_ext = 0x02, 165 .have_fault = 0x0e, 166 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT, 167 }, 168 [max6699] = { 169 .channels = 5, 170 .have_crit = 0x12, 171 .have_ext = 0x02, 172 .have_fault = 0x1e, 173 .valid_conf = MAX6697_CONF_RESISTANCE | MAX6697_CONF_TIMEOUT, 174 }, 175 }; 176 177 static inline int max6581_offset_to_millic(int val) 178 { 179 return sign_extend32(val, 7) * 250; 180 } 181 182 static struct max6697_data *max6697_update_device(struct device *dev) 183 { 184 struct max6697_data *data = dev_get_drvdata(dev); 185 struct i2c_client *client = data->client; 186 struct max6697_data *ret = data; 187 int val; 188 int i; 189 u32 alarms; 190 191 mutex_lock(&data->update_lock); 192 193 if (data->valid && 194 !time_after(jiffies, data->last_updated 195 + msecs_to_jiffies(data->update_interval))) 196 goto abort; 197 198 for (i = 0; i < data->chip->channels; i++) { 199 if (data->chip->have_ext & (1 << i)) { 200 val = i2c_smbus_read_byte_data(client, 201 MAX6697_REG_TEMP_EXT[i]); 202 if (unlikely(val < 0)) { 203 ret = ERR_PTR(val); 204 goto abort; 205 } 206 data->temp[i][MAX6697_TEMP_EXT] = val; 207 } 208 209 val = i2c_smbus_read_byte_data(client, MAX6697_REG_TEMP[i]); 210 if (unlikely(val < 0)) { 211 ret = ERR_PTR(val); 212 goto abort; 213 } 214 data->temp[i][MAX6697_TEMP_INPUT] = val; 215 216 val = i2c_smbus_read_byte_data(client, MAX6697_REG_MAX[i]); 217 if (unlikely(val < 0)) { 218 ret = ERR_PTR(val); 219 goto abort; 220 } 221 data->temp[i][MAX6697_TEMP_MAX] = val; 222 223 if (data->chip->have_crit & (1 << i)) { 224 val = i2c_smbus_read_byte_data(client, 225 MAX6697_REG_CRIT[i]); 226 if (unlikely(val < 0)) { 227 ret = ERR_PTR(val); 228 goto abort; 229 } 230 data->temp[i][MAX6697_TEMP_CRIT] = val; 231 } 232 } 233 234 alarms = 0; 235 for (i = 0; i < 3; i++) { 236 val = i2c_smbus_read_byte_data(client, MAX6697_REG_STAT(i)); 237 if (unlikely(val < 0)) { 238 ret = ERR_PTR(val); 239 goto abort; 240 } 241 alarms = (alarms << 8) | val; 242 } 243 data->alarms = alarms; 244 data->last_updated = jiffies; 245 data->valid = true; 246 abort: 247 mutex_unlock(&data->update_lock); 248 249 return ret; 250 } 251 252 static ssize_t temp_input_show(struct device *dev, 253 struct device_attribute *devattr, char *buf) 254 { 255 int index = to_sensor_dev_attr(devattr)->index; 256 struct max6697_data *data = max6697_update_device(dev); 257 int temp; 258 259 if (IS_ERR(data)) 260 return PTR_ERR(data); 261 262 temp = (data->temp[index][MAX6697_TEMP_INPUT] - data->temp_offset) << 3; 263 temp |= data->temp[index][MAX6697_TEMP_EXT] >> 5; 264 265 return sprintf(buf, "%d\n", temp * 125); 266 } 267 268 static ssize_t temp_show(struct device *dev, struct device_attribute *devattr, 269 char *buf) 270 { 271 int nr = to_sensor_dev_attr_2(devattr)->nr; 272 int index = to_sensor_dev_attr_2(devattr)->index; 273 struct max6697_data *data = max6697_update_device(dev); 274 int temp; 275 276 if (IS_ERR(data)) 277 return PTR_ERR(data); 278 279 temp = data->temp[nr][index]; 280 temp -= data->temp_offset; 281 282 return sprintf(buf, "%d\n", temp * 1000); 283 } 284 285 static ssize_t alarm_show(struct device *dev, struct device_attribute *attr, 286 char *buf) 287 { 288 int index = to_sensor_dev_attr(attr)->index; 289 struct max6697_data *data = max6697_update_device(dev); 290 291 if (IS_ERR(data)) 292 return PTR_ERR(data); 293 294 if (data->chip->alarm_map) 295 index = data->chip->alarm_map[index]; 296 297 return sprintf(buf, "%u\n", (data->alarms >> index) & 0x1); 298 } 299 300 static ssize_t temp_store(struct device *dev, 301 struct device_attribute *devattr, const char *buf, 302 size_t count) 303 { 304 int nr = to_sensor_dev_attr_2(devattr)->nr; 305 int index = to_sensor_dev_attr_2(devattr)->index; 306 struct max6697_data *data = dev_get_drvdata(dev); 307 long temp; 308 int ret; 309 310 ret = kstrtol(buf, 10, &temp); 311 if (ret < 0) 312 return ret; 313 314 mutex_lock(&data->update_lock); 315 temp = DIV_ROUND_CLOSEST(temp, 1000) + data->temp_offset; 316 temp = clamp_val(temp, 0, data->type == max6581 ? 255 : 127); 317 data->temp[nr][index] = temp; 318 ret = i2c_smbus_write_byte_data(data->client, 319 index == 2 ? MAX6697_REG_MAX[nr] 320 : MAX6697_REG_CRIT[nr], 321 temp); 322 mutex_unlock(&data->update_lock); 323 324 return ret < 0 ? ret : count; 325 } 326 327 static ssize_t offset_store(struct device *dev, struct device_attribute *devattr, const char *buf, 328 size_t count) 329 { 330 int val, ret, index, select; 331 struct max6697_data *data; 332 bool channel_enabled; 333 long temp; 334 335 index = to_sensor_dev_attr(devattr)->index; 336 data = dev_get_drvdata(dev); 337 ret = kstrtol(buf, 10, &temp); 338 if (ret < 0) 339 return ret; 340 341 mutex_lock(&data->update_lock); 342 select = i2c_smbus_read_byte_data(data->client, MAX6581_REG_OFFSET_SELECT); 343 if (select < 0) { 344 ret = select; 345 goto abort; 346 } 347 channel_enabled = (select & (1 << (index - 1))); 348 temp = clamp_val(temp, MAX6581_OFFSET_MIN, MAX6581_OFFSET_MAX); 349 val = DIV_ROUND_CLOSEST(temp, 250); 350 /* disable the offset for channel if the new offset is 0 */ 351 if (val == 0) { 352 if (channel_enabled) 353 ret = i2c_smbus_write_byte_data(data->client, MAX6581_REG_OFFSET_SELECT, 354 select & ~(1 << (index - 1))); 355 ret = ret < 0 ? ret : count; 356 goto abort; 357 } 358 if (!channel_enabled) { 359 ret = i2c_smbus_write_byte_data(data->client, MAX6581_REG_OFFSET_SELECT, 360 select | (1 << (index - 1))); 361 if (ret < 0) 362 goto abort; 363 } 364 ret = i2c_smbus_write_byte_data(data->client, MAX6581_REG_OFFSET, val); 365 ret = ret < 0 ? ret : count; 366 367 abort: 368 mutex_unlock(&data->update_lock); 369 return ret; 370 } 371 372 static ssize_t offset_show(struct device *dev, struct device_attribute *devattr, char *buf) 373 { 374 struct max6697_data *data; 375 int select, ret, index; 376 377 index = to_sensor_dev_attr(devattr)->index; 378 data = dev_get_drvdata(dev); 379 mutex_lock(&data->update_lock); 380 select = i2c_smbus_read_byte_data(data->client, MAX6581_REG_OFFSET_SELECT); 381 if (select < 0) 382 ret = select; 383 else if (select & (1 << (index - 1))) 384 ret = i2c_smbus_read_byte_data(data->client, MAX6581_REG_OFFSET); 385 else 386 ret = 0; 387 mutex_unlock(&data->update_lock); 388 return ret < 0 ? ret : sprintf(buf, "%d\n", max6581_offset_to_millic(ret)); 389 } 390 391 static SENSOR_DEVICE_ATTR_RO(temp1_input, temp_input, 0); 392 static SENSOR_DEVICE_ATTR_2_RW(temp1_max, temp, 0, MAX6697_TEMP_MAX); 393 static SENSOR_DEVICE_ATTR_2_RW(temp1_crit, temp, 0, MAX6697_TEMP_CRIT); 394 395 static SENSOR_DEVICE_ATTR_RO(temp2_input, temp_input, 1); 396 static SENSOR_DEVICE_ATTR_2_RW(temp2_max, temp, 1, MAX6697_TEMP_MAX); 397 static SENSOR_DEVICE_ATTR_2_RW(temp2_crit, temp, 1, MAX6697_TEMP_CRIT); 398 399 static SENSOR_DEVICE_ATTR_RO(temp3_input, temp_input, 2); 400 static SENSOR_DEVICE_ATTR_2_RW(temp3_max, temp, 2, MAX6697_TEMP_MAX); 401 static SENSOR_DEVICE_ATTR_2_RW(temp3_crit, temp, 2, MAX6697_TEMP_CRIT); 402 403 static SENSOR_DEVICE_ATTR_RO(temp4_input, temp_input, 3); 404 static SENSOR_DEVICE_ATTR_2_RW(temp4_max, temp, 3, MAX6697_TEMP_MAX); 405 static SENSOR_DEVICE_ATTR_2_RW(temp4_crit, temp, 3, MAX6697_TEMP_CRIT); 406 407 static SENSOR_DEVICE_ATTR_RO(temp5_input, temp_input, 4); 408 static SENSOR_DEVICE_ATTR_2_RW(temp5_max, temp, 4, MAX6697_TEMP_MAX); 409 static SENSOR_DEVICE_ATTR_2_RW(temp5_crit, temp, 4, MAX6697_TEMP_CRIT); 410 411 static SENSOR_DEVICE_ATTR_RO(temp6_input, temp_input, 5); 412 static SENSOR_DEVICE_ATTR_2_RW(temp6_max, temp, 5, MAX6697_TEMP_MAX); 413 static SENSOR_DEVICE_ATTR_2_RW(temp6_crit, temp, 5, MAX6697_TEMP_CRIT); 414 415 static SENSOR_DEVICE_ATTR_RO(temp7_input, temp_input, 6); 416 static SENSOR_DEVICE_ATTR_2_RW(temp7_max, temp, 6, MAX6697_TEMP_MAX); 417 static SENSOR_DEVICE_ATTR_2_RW(temp7_crit, temp, 6, MAX6697_TEMP_CRIT); 418 419 static SENSOR_DEVICE_ATTR_RO(temp8_input, temp_input, 7); 420 static SENSOR_DEVICE_ATTR_2_RW(temp8_max, temp, 7, MAX6697_TEMP_MAX); 421 static SENSOR_DEVICE_ATTR_2_RW(temp8_crit, temp, 7, MAX6697_TEMP_CRIT); 422 423 static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, alarm, 22); 424 static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, alarm, 16); 425 static SENSOR_DEVICE_ATTR_RO(temp3_max_alarm, alarm, 17); 426 static SENSOR_DEVICE_ATTR_RO(temp4_max_alarm, alarm, 18); 427 static SENSOR_DEVICE_ATTR_RO(temp5_max_alarm, alarm, 19); 428 static SENSOR_DEVICE_ATTR_RO(temp6_max_alarm, alarm, 20); 429 static SENSOR_DEVICE_ATTR_RO(temp7_max_alarm, alarm, 21); 430 static SENSOR_DEVICE_ATTR_RO(temp8_max_alarm, alarm, 23); 431 432 static SENSOR_DEVICE_ATTR_RO(temp1_crit_alarm, alarm, 14); 433 static SENSOR_DEVICE_ATTR_RO(temp2_crit_alarm, alarm, 8); 434 static SENSOR_DEVICE_ATTR_RO(temp3_crit_alarm, alarm, 9); 435 static SENSOR_DEVICE_ATTR_RO(temp4_crit_alarm, alarm, 10); 436 static SENSOR_DEVICE_ATTR_RO(temp5_crit_alarm, alarm, 11); 437 static SENSOR_DEVICE_ATTR_RO(temp6_crit_alarm, alarm, 12); 438 static SENSOR_DEVICE_ATTR_RO(temp7_crit_alarm, alarm, 13); 439 static SENSOR_DEVICE_ATTR_RO(temp8_crit_alarm, alarm, 15); 440 441 static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, 1); 442 static SENSOR_DEVICE_ATTR_RO(temp3_fault, alarm, 2); 443 static SENSOR_DEVICE_ATTR_RO(temp4_fault, alarm, 3); 444 static SENSOR_DEVICE_ATTR_RO(temp5_fault, alarm, 4); 445 static SENSOR_DEVICE_ATTR_RO(temp6_fault, alarm, 5); 446 static SENSOR_DEVICE_ATTR_RO(temp7_fault, alarm, 6); 447 static SENSOR_DEVICE_ATTR_RO(temp8_fault, alarm, 7); 448 449 /* There is no offset for local temperature so starting from temp2 */ 450 static SENSOR_DEVICE_ATTR_RW(temp2_offset, offset, 1); 451 static SENSOR_DEVICE_ATTR_RW(temp3_offset, offset, 2); 452 static SENSOR_DEVICE_ATTR_RW(temp4_offset, offset, 3); 453 static SENSOR_DEVICE_ATTR_RW(temp5_offset, offset, 4); 454 static SENSOR_DEVICE_ATTR_RW(temp6_offset, offset, 5); 455 static SENSOR_DEVICE_ATTR_RW(temp7_offset, offset, 6); 456 static SENSOR_DEVICE_ATTR_RW(temp8_offset, offset, 7); 457 458 static DEVICE_ATTR(dummy, 0, NULL, NULL); 459 460 static umode_t max6697_is_visible(struct kobject *kobj, struct attribute *attr, 461 int index) 462 { 463 struct device *dev = kobj_to_dev(kobj); 464 struct max6697_data *data = dev_get_drvdata(dev); 465 const struct max6697_chip_data *chip = data->chip; 466 int channel = index / 7; /* channel number */ 467 int nr = index % 7; /* attribute index within channel */ 468 469 if (channel >= chip->channels) 470 return 0; 471 472 if ((nr == 3 || nr == 4) && !(chip->have_crit & (1 << channel))) 473 return 0; 474 if (nr == 5 && !(chip->have_fault & (1 << channel))) 475 return 0; 476 /* offset reg is only supported on max6581 remote channels */ 477 if (nr == 6) 478 if (data->type != max6581 || channel == 0) 479 return 0; 480 481 return attr->mode; 482 } 483 484 /* 485 * max6697_is_visible uses the index into the following array to determine 486 * if attributes should be created or not. Any change in order or content 487 * must be matched in max6697_is_visible. 488 */ 489 static struct attribute *max6697_attributes[] = { 490 &sensor_dev_attr_temp1_input.dev_attr.attr, 491 &sensor_dev_attr_temp1_max.dev_attr.attr, 492 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, 493 &sensor_dev_attr_temp1_crit.dev_attr.attr, 494 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr, 495 &dev_attr_dummy.attr, 496 &dev_attr_dummy.attr, 497 498 &sensor_dev_attr_temp2_input.dev_attr.attr, 499 &sensor_dev_attr_temp2_max.dev_attr.attr, 500 &sensor_dev_attr_temp2_max_alarm.dev_attr.attr, 501 &sensor_dev_attr_temp2_crit.dev_attr.attr, 502 &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr, 503 &sensor_dev_attr_temp2_fault.dev_attr.attr, 504 &sensor_dev_attr_temp2_offset.dev_attr.attr, 505 506 &sensor_dev_attr_temp3_input.dev_attr.attr, 507 &sensor_dev_attr_temp3_max.dev_attr.attr, 508 &sensor_dev_attr_temp3_max_alarm.dev_attr.attr, 509 &sensor_dev_attr_temp3_crit.dev_attr.attr, 510 &sensor_dev_attr_temp3_crit_alarm.dev_attr.attr, 511 &sensor_dev_attr_temp3_fault.dev_attr.attr, 512 &sensor_dev_attr_temp3_offset.dev_attr.attr, 513 514 &sensor_dev_attr_temp4_input.dev_attr.attr, 515 &sensor_dev_attr_temp4_max.dev_attr.attr, 516 &sensor_dev_attr_temp4_max_alarm.dev_attr.attr, 517 &sensor_dev_attr_temp4_crit.dev_attr.attr, 518 &sensor_dev_attr_temp4_crit_alarm.dev_attr.attr, 519 &sensor_dev_attr_temp4_fault.dev_attr.attr, 520 &sensor_dev_attr_temp4_offset.dev_attr.attr, 521 522 &sensor_dev_attr_temp5_input.dev_attr.attr, 523 &sensor_dev_attr_temp5_max.dev_attr.attr, 524 &sensor_dev_attr_temp5_max_alarm.dev_attr.attr, 525 &sensor_dev_attr_temp5_crit.dev_attr.attr, 526 &sensor_dev_attr_temp5_crit_alarm.dev_attr.attr, 527 &sensor_dev_attr_temp5_fault.dev_attr.attr, 528 &sensor_dev_attr_temp5_offset.dev_attr.attr, 529 530 &sensor_dev_attr_temp6_input.dev_attr.attr, 531 &sensor_dev_attr_temp6_max.dev_attr.attr, 532 &sensor_dev_attr_temp6_max_alarm.dev_attr.attr, 533 &sensor_dev_attr_temp6_crit.dev_attr.attr, 534 &sensor_dev_attr_temp6_crit_alarm.dev_attr.attr, 535 &sensor_dev_attr_temp6_fault.dev_attr.attr, 536 &sensor_dev_attr_temp6_offset.dev_attr.attr, 537 538 &sensor_dev_attr_temp7_input.dev_attr.attr, 539 &sensor_dev_attr_temp7_max.dev_attr.attr, 540 &sensor_dev_attr_temp7_max_alarm.dev_attr.attr, 541 &sensor_dev_attr_temp7_crit.dev_attr.attr, 542 &sensor_dev_attr_temp7_crit_alarm.dev_attr.attr, 543 &sensor_dev_attr_temp7_fault.dev_attr.attr, 544 &sensor_dev_attr_temp7_offset.dev_attr.attr, 545 546 &sensor_dev_attr_temp8_input.dev_attr.attr, 547 &sensor_dev_attr_temp8_max.dev_attr.attr, 548 &sensor_dev_attr_temp8_max_alarm.dev_attr.attr, 549 &sensor_dev_attr_temp8_crit.dev_attr.attr, 550 &sensor_dev_attr_temp8_crit_alarm.dev_attr.attr, 551 &sensor_dev_attr_temp8_fault.dev_attr.attr, 552 &sensor_dev_attr_temp8_offset.dev_attr.attr, 553 NULL 554 }; 555 556 static const struct attribute_group max6697_group = { 557 .attrs = max6697_attributes, .is_visible = max6697_is_visible, 558 }; 559 __ATTRIBUTE_GROUPS(max6697); 560 561 static void max6697_get_config_of(struct device_node *node, 562 struct max6697_platform_data *pdata) 563 { 564 int len; 565 const __be32 *prop; 566 567 pdata->smbus_timeout_disable = 568 of_property_read_bool(node, "smbus-timeout-disable"); 569 pdata->extended_range_enable = 570 of_property_read_bool(node, "extended-range-enable"); 571 pdata->beta_compensation = 572 of_property_read_bool(node, "beta-compensation-enable"); 573 574 prop = of_get_property(node, "alert-mask", &len); 575 if (prop && len == sizeof(u32)) 576 pdata->alert_mask = be32_to_cpu(prop[0]); 577 prop = of_get_property(node, "over-temperature-mask", &len); 578 if (prop && len == sizeof(u32)) 579 pdata->over_temperature_mask = be32_to_cpu(prop[0]); 580 prop = of_get_property(node, "resistance-cancellation", &len); 581 if (prop) { 582 if (len == sizeof(u32)) 583 pdata->resistance_cancellation = be32_to_cpu(prop[0]); 584 else 585 pdata->resistance_cancellation = 0xfe; 586 } 587 prop = of_get_property(node, "transistor-ideality", &len); 588 if (prop && len == 2 * sizeof(u32)) { 589 pdata->ideality_mask = be32_to_cpu(prop[0]); 590 pdata->ideality_value = be32_to_cpu(prop[1]); 591 } 592 } 593 594 static int max6697_init_chip(struct max6697_data *data, 595 struct i2c_client *client) 596 { 597 struct max6697_platform_data *pdata = dev_get_platdata(&client->dev); 598 struct max6697_platform_data p; 599 const struct max6697_chip_data *chip = data->chip; 600 int factor = chip->channels; 601 int ret, reg; 602 603 /* 604 * Don't touch configuration if neither platform data nor OF 605 * configuration was specified. If that is the case, use the 606 * current chip configuration. 607 */ 608 if (!pdata && !client->dev.of_node) { 609 reg = i2c_smbus_read_byte_data(client, MAX6697_REG_CONFIG); 610 if (reg < 0) 611 return reg; 612 if (data->type == max6581) { 613 if (reg & MAX6581_CONF_EXTENDED) 614 data->temp_offset = 64; 615 reg = i2c_smbus_read_byte_data(client, 616 MAX6581_REG_RESISTANCE); 617 if (reg < 0) 618 return reg; 619 factor += hweight8(reg); 620 } else { 621 if (reg & MAX6697_CONF_RESISTANCE) 622 factor++; 623 } 624 goto done; 625 } 626 627 if (client->dev.of_node) { 628 memset(&p, 0, sizeof(p)); 629 max6697_get_config_of(client->dev.of_node, &p); 630 pdata = &p; 631 } 632 633 reg = 0; 634 if (pdata->smbus_timeout_disable && 635 (chip->valid_conf & MAX6697_CONF_TIMEOUT)) { 636 reg |= MAX6697_CONF_TIMEOUT; 637 } 638 if (pdata->extended_range_enable && 639 (chip->valid_conf & MAX6581_CONF_EXTENDED)) { 640 reg |= MAX6581_CONF_EXTENDED; 641 data->temp_offset = 64; 642 } 643 if (pdata->resistance_cancellation && 644 (chip->valid_conf & MAX6697_CONF_RESISTANCE)) { 645 reg |= MAX6697_CONF_RESISTANCE; 646 factor++; 647 } 648 if (pdata->beta_compensation && 649 (chip->valid_conf & MAX6693_CONF_BETA)) { 650 reg |= MAX6693_CONF_BETA; 651 } 652 653 ret = i2c_smbus_write_byte_data(client, MAX6697_REG_CONFIG, reg); 654 if (ret < 0) 655 return ret; 656 657 ret = i2c_smbus_write_byte_data(client, MAX6697_REG_ALERT_MASK, 658 MAX6697_ALERT_MAP_BITS(pdata->alert_mask)); 659 if (ret < 0) 660 return ret; 661 662 ret = i2c_smbus_write_byte_data(client, MAX6697_REG_OVERT_MASK, 663 MAX6697_OVERT_MAP_BITS(pdata->over_temperature_mask)); 664 if (ret < 0) 665 return ret; 666 667 if (data->type == max6581) { 668 factor += hweight8(pdata->resistance_cancellation >> 1); 669 ret = i2c_smbus_write_byte_data(client, MAX6581_REG_RESISTANCE, 670 pdata->resistance_cancellation >> 1); 671 if (ret < 0) 672 return ret; 673 ret = i2c_smbus_write_byte_data(client, MAX6581_REG_IDEALITY, 674 pdata->ideality_value); 675 if (ret < 0) 676 return ret; 677 ret = i2c_smbus_write_byte_data(client, 678 MAX6581_REG_IDEALITY_SELECT, 679 pdata->ideality_mask >> 1); 680 if (ret < 0) 681 return ret; 682 } 683 done: 684 data->update_interval = factor * MAX6697_CONV_TIME; 685 return 0; 686 } 687 688 static const struct i2c_device_id max6697_id[]; 689 690 static int max6697_probe(struct i2c_client *client) 691 { 692 struct i2c_adapter *adapter = client->adapter; 693 struct device *dev = &client->dev; 694 struct max6697_data *data; 695 struct device *hwmon_dev; 696 int err; 697 698 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 699 return -ENODEV; 700 701 data = devm_kzalloc(dev, sizeof(struct max6697_data), GFP_KERNEL); 702 if (!data) 703 return -ENOMEM; 704 705 if (client->dev.of_node) 706 data->type = (enum chips)of_device_get_match_data(&client->dev); 707 else 708 data->type = i2c_match_id(max6697_id, client)->driver_data; 709 data->chip = &max6697_chip_data[data->type]; 710 data->client = client; 711 mutex_init(&data->update_lock); 712 713 err = max6697_init_chip(data, client); 714 if (err) 715 return err; 716 717 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, 718 data, 719 max6697_groups); 720 return PTR_ERR_OR_ZERO(hwmon_dev); 721 } 722 723 static const struct i2c_device_id max6697_id[] = { 724 { "max6581", max6581 }, 725 { "max6602", max6602 }, 726 { "max6622", max6622 }, 727 { "max6636", max6636 }, 728 { "max6689", max6689 }, 729 { "max6693", max6693 }, 730 { "max6694", max6694 }, 731 { "max6697", max6697 }, 732 { "max6698", max6698 }, 733 { "max6699", max6699 }, 734 { } 735 }; 736 MODULE_DEVICE_TABLE(i2c, max6697_id); 737 738 static const struct of_device_id __maybe_unused max6697_of_match[] = { 739 { 740 .compatible = "maxim,max6581", 741 .data = (void *)max6581 742 }, 743 { 744 .compatible = "maxim,max6602", 745 .data = (void *)max6602 746 }, 747 { 748 .compatible = "maxim,max6622", 749 .data = (void *)max6622 750 }, 751 { 752 .compatible = "maxim,max6636", 753 .data = (void *)max6636 754 }, 755 { 756 .compatible = "maxim,max6689", 757 .data = (void *)max6689 758 }, 759 { 760 .compatible = "maxim,max6693", 761 .data = (void *)max6693 762 }, 763 { 764 .compatible = "maxim,max6694", 765 .data = (void *)max6694 766 }, 767 { 768 .compatible = "maxim,max6697", 769 .data = (void *)max6697 770 }, 771 { 772 .compatible = "maxim,max6698", 773 .data = (void *)max6698 774 }, 775 { 776 .compatible = "maxim,max6699", 777 .data = (void *)max6699 778 }, 779 { }, 780 }; 781 MODULE_DEVICE_TABLE(of, max6697_of_match); 782 783 static struct i2c_driver max6697_driver = { 784 .class = I2C_CLASS_HWMON, 785 .driver = { 786 .name = "max6697", 787 .of_match_table = of_match_ptr(max6697_of_match), 788 }, 789 .probe_new = max6697_probe, 790 .id_table = max6697_id, 791 }; 792 793 module_i2c_driver(max6697_driver); 794 795 MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>"); 796 MODULE_DESCRIPTION("MAX6697 temperature sensor driver"); 797 MODULE_LICENSE("GPL"); 798