1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Driver for 4 * Maxim MAX16065/MAX16066 12-Channel/8-Channel, Flash-Configurable 5 * System Managers with Nonvolatile Fault Registers 6 * Maxim MAX16067/MAX16068 6-Channel, Flash-Configurable System Managers 7 * with Nonvolatile Fault Registers 8 * Maxim MAX16070/MAX16071 12-Channel/8-Channel, Flash-Configurable System 9 * Monitors with Nonvolatile Fault Registers 10 * 11 * Copyright (C) 2011 Ericsson AB. 12 */ 13 14 #include <linux/kernel.h> 15 #include <linux/module.h> 16 #include <linux/init.h> 17 #include <linux/err.h> 18 #include <linux/slab.h> 19 #include <linux/i2c.h> 20 #include <linux/hwmon.h> 21 #include <linux/hwmon-sysfs.h> 22 #include <linux/jiffies.h> 23 24 enum chips { max16065, max16066, max16067, max16068, max16070, max16071 }; 25 26 /* 27 * Registers 28 */ 29 #define MAX16065_ADC(x) ((x) * 2) 30 31 #define MAX16065_CURR_SENSE 0x18 32 #define MAX16065_CSP_ADC 0x19 33 #define MAX16065_FAULT(x) (0x1b + (x)) 34 #define MAX16065_SCALE(x) (0x43 + (x)) 35 #define MAX16065_CURR_CONTROL 0x47 36 #define MAX16065_LIMIT(l, x) (0x48 + (l) + (x) * 3) /* 37 * l: limit 38 * 0: min/max 39 * 1: crit 40 * 2: lcrit 41 * x: ADC index 42 */ 43 44 #define MAX16065_SW_ENABLE 0x73 45 46 #define MAX16065_WARNING_OV (1 << 3) /* Set if secondary threshold is OV 47 warning */ 48 49 #define MAX16065_CURR_ENABLE (1 << 0) 50 51 #define MAX16065_NUM_LIMIT 3 52 #define MAX16065_NUM_ADC 12 /* maximum number of ADC channels */ 53 54 static const int max16065_num_adc[] = { 55 [max16065] = 12, 56 [max16066] = 8, 57 [max16067] = 6, 58 [max16068] = 6, 59 [max16070] = 12, 60 [max16071] = 8, 61 }; 62 63 static const bool max16065_have_secondary[] = { 64 [max16065] = true, 65 [max16066] = true, 66 [max16067] = false, 67 [max16068] = false, 68 [max16070] = true, 69 [max16071] = true, 70 }; 71 72 static const bool max16065_have_current[] = { 73 [max16065] = true, 74 [max16066] = true, 75 [max16067] = false, 76 [max16068] = false, 77 [max16070] = true, 78 [max16071] = true, 79 }; 80 81 struct max16065_data { 82 enum chips chip; 83 struct i2c_client *client; 84 const struct attribute_group *groups[4]; 85 struct mutex update_lock; 86 bool valid; 87 unsigned long last_updated; /* in jiffies */ 88 int num_adc; 89 bool have_current; 90 int curr_gain; 91 /* limits are in mV */ 92 int limit[MAX16065_NUM_LIMIT][MAX16065_NUM_ADC]; 93 int range[MAX16065_NUM_ADC + 1];/* voltage range */ 94 int adc[MAX16065_NUM_ADC + 1]; /* adc values (raw) including csp_adc */ 95 int curr_sense; 96 int fault[2]; 97 }; 98 99 static const int max16065_adc_range[] = { 5560, 2780, 1390, 0 }; 100 static const int max16065_csp_adc_range[] = { 7000, 14000 }; 101 102 /* ADC registers have 10 bit resolution. */ 103 static inline int ADC_TO_MV(int adc, int range) 104 { 105 return (adc * range) / 1024; 106 } 107 108 /* 109 * Limit registers have 8 bit resolution and match upper 8 bits of ADC 110 * registers. 111 */ 112 static inline int LIMIT_TO_MV(int limit, int range) 113 { 114 return limit * range / 256; 115 } 116 117 static inline int MV_TO_LIMIT(unsigned long mv, int range) 118 { 119 mv = clamp_val(mv, 0, ULONG_MAX / 256); 120 return DIV_ROUND_CLOSEST(clamp_val(mv * 256, 0, range * 255), range); 121 } 122 123 static inline int ADC_TO_CURR(int adc, int gain) 124 { 125 return adc * 1400000 / (gain * 255); 126 } 127 128 /* 129 * max16065_read_adc() 130 * 131 * Read 16 bit value from <reg>, <reg+1>. 132 * Upper 8 bits are in <reg>, lower 2 bits are in bits 7:6 of <reg+1>. 133 */ 134 static int max16065_read_adc(struct i2c_client *client, int reg) 135 { 136 int rv; 137 138 rv = i2c_smbus_read_word_swapped(client, reg); 139 if (unlikely(rv < 0)) 140 return rv; 141 return rv >> 6; 142 } 143 144 static struct max16065_data *max16065_update_device(struct device *dev) 145 { 146 struct max16065_data *data = dev_get_drvdata(dev); 147 struct i2c_client *client = data->client; 148 149 mutex_lock(&data->update_lock); 150 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { 151 int i; 152 153 for (i = 0; i < data->num_adc; i++) 154 data->adc[i] 155 = max16065_read_adc(client, MAX16065_ADC(i)); 156 157 if (data->have_current) { 158 data->adc[MAX16065_NUM_ADC] 159 = max16065_read_adc(client, MAX16065_CSP_ADC); 160 data->curr_sense 161 = i2c_smbus_read_byte_data(client, 162 MAX16065_CURR_SENSE); 163 } 164 165 for (i = 0; i < 2; i++) 166 data->fault[i] 167 = i2c_smbus_read_byte_data(client, MAX16065_FAULT(i)); 168 169 /* 170 * MAX16067 and MAX16068 have separate undervoltage and 171 * overvoltage alarm bits. Squash them together. 172 */ 173 if (data->chip == max16067 || data->chip == max16068) 174 data->fault[0] |= data->fault[1]; 175 176 data->last_updated = jiffies; 177 data->valid = true; 178 } 179 mutex_unlock(&data->update_lock); 180 return data; 181 } 182 183 static ssize_t max16065_alarm_show(struct device *dev, 184 struct device_attribute *da, char *buf) 185 { 186 struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(da); 187 struct max16065_data *data = max16065_update_device(dev); 188 int val = data->fault[attr2->nr]; 189 190 if (val < 0) 191 return val; 192 193 val &= (1 << attr2->index); 194 if (val) 195 i2c_smbus_write_byte_data(data->client, 196 MAX16065_FAULT(attr2->nr), val); 197 198 return sysfs_emit(buf, "%d\n", !!val); 199 } 200 201 static ssize_t max16065_input_show(struct device *dev, 202 struct device_attribute *da, char *buf) 203 { 204 struct sensor_device_attribute *attr = to_sensor_dev_attr(da); 205 struct max16065_data *data = max16065_update_device(dev); 206 int adc = data->adc[attr->index]; 207 208 if (unlikely(adc < 0)) 209 return adc; 210 211 return sysfs_emit(buf, "%d\n", 212 ADC_TO_MV(adc, data->range[attr->index])); 213 } 214 215 static ssize_t max16065_current_show(struct device *dev, 216 struct device_attribute *da, char *buf) 217 { 218 struct max16065_data *data = max16065_update_device(dev); 219 int curr_sense = data->curr_sense; 220 221 if (unlikely(curr_sense < 0)) 222 return curr_sense; 223 224 return sysfs_emit(buf, "%d\n", 225 ADC_TO_CURR(curr_sense, data->curr_gain)); 226 } 227 228 static ssize_t max16065_limit_store(struct device *dev, 229 struct device_attribute *da, 230 const char *buf, size_t count) 231 { 232 struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(da); 233 struct max16065_data *data = dev_get_drvdata(dev); 234 unsigned long val; 235 int err; 236 int limit; 237 238 err = kstrtoul(buf, 10, &val); 239 if (unlikely(err < 0)) 240 return err; 241 242 limit = MV_TO_LIMIT(val, data->range[attr2->index]); 243 244 mutex_lock(&data->update_lock); 245 data->limit[attr2->nr][attr2->index] 246 = LIMIT_TO_MV(limit, data->range[attr2->index]); 247 i2c_smbus_write_byte_data(data->client, 248 MAX16065_LIMIT(attr2->nr, attr2->index), 249 limit); 250 mutex_unlock(&data->update_lock); 251 252 return count; 253 } 254 255 static ssize_t max16065_limit_show(struct device *dev, 256 struct device_attribute *da, char *buf) 257 { 258 struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(da); 259 struct max16065_data *data = dev_get_drvdata(dev); 260 261 return sysfs_emit(buf, "%d\n", 262 data->limit[attr2->nr][attr2->index]); 263 } 264 265 /* Construct a sensor_device_attribute structure for each register */ 266 267 /* Input voltages */ 268 static SENSOR_DEVICE_ATTR_RO(in0_input, max16065_input, 0); 269 static SENSOR_DEVICE_ATTR_RO(in1_input, max16065_input, 1); 270 static SENSOR_DEVICE_ATTR_RO(in2_input, max16065_input, 2); 271 static SENSOR_DEVICE_ATTR_RO(in3_input, max16065_input, 3); 272 static SENSOR_DEVICE_ATTR_RO(in4_input, max16065_input, 4); 273 static SENSOR_DEVICE_ATTR_RO(in5_input, max16065_input, 5); 274 static SENSOR_DEVICE_ATTR_RO(in6_input, max16065_input, 6); 275 static SENSOR_DEVICE_ATTR_RO(in7_input, max16065_input, 7); 276 static SENSOR_DEVICE_ATTR_RO(in8_input, max16065_input, 8); 277 static SENSOR_DEVICE_ATTR_RO(in9_input, max16065_input, 9); 278 static SENSOR_DEVICE_ATTR_RO(in10_input, max16065_input, 10); 279 static SENSOR_DEVICE_ATTR_RO(in11_input, max16065_input, 11); 280 static SENSOR_DEVICE_ATTR_RO(in12_input, max16065_input, 12); 281 282 /* Input voltages lcrit */ 283 static SENSOR_DEVICE_ATTR_2_RW(in0_lcrit, max16065_limit, 2, 0); 284 static SENSOR_DEVICE_ATTR_2_RW(in1_lcrit, max16065_limit, 2, 1); 285 static SENSOR_DEVICE_ATTR_2_RW(in2_lcrit, max16065_limit, 2, 2); 286 static SENSOR_DEVICE_ATTR_2_RW(in3_lcrit, max16065_limit, 2, 3); 287 static SENSOR_DEVICE_ATTR_2_RW(in4_lcrit, max16065_limit, 2, 4); 288 static SENSOR_DEVICE_ATTR_2_RW(in5_lcrit, max16065_limit, 2, 5); 289 static SENSOR_DEVICE_ATTR_2_RW(in6_lcrit, max16065_limit, 2, 6); 290 static SENSOR_DEVICE_ATTR_2_RW(in7_lcrit, max16065_limit, 2, 7); 291 static SENSOR_DEVICE_ATTR_2_RW(in8_lcrit, max16065_limit, 2, 8); 292 static SENSOR_DEVICE_ATTR_2_RW(in9_lcrit, max16065_limit, 2, 9); 293 static SENSOR_DEVICE_ATTR_2_RW(in10_lcrit, max16065_limit, 2, 10); 294 static SENSOR_DEVICE_ATTR_2_RW(in11_lcrit, max16065_limit, 2, 11); 295 296 /* Input voltages crit */ 297 static SENSOR_DEVICE_ATTR_2_RW(in0_crit, max16065_limit, 1, 0); 298 static SENSOR_DEVICE_ATTR_2_RW(in1_crit, max16065_limit, 1, 1); 299 static SENSOR_DEVICE_ATTR_2_RW(in2_crit, max16065_limit, 1, 2); 300 static SENSOR_DEVICE_ATTR_2_RW(in3_crit, max16065_limit, 1, 3); 301 static SENSOR_DEVICE_ATTR_2_RW(in4_crit, max16065_limit, 1, 4); 302 static SENSOR_DEVICE_ATTR_2_RW(in5_crit, max16065_limit, 1, 5); 303 static SENSOR_DEVICE_ATTR_2_RW(in6_crit, max16065_limit, 1, 6); 304 static SENSOR_DEVICE_ATTR_2_RW(in7_crit, max16065_limit, 1, 7); 305 static SENSOR_DEVICE_ATTR_2_RW(in8_crit, max16065_limit, 1, 8); 306 static SENSOR_DEVICE_ATTR_2_RW(in9_crit, max16065_limit, 1, 9); 307 static SENSOR_DEVICE_ATTR_2_RW(in10_crit, max16065_limit, 1, 10); 308 static SENSOR_DEVICE_ATTR_2_RW(in11_crit, max16065_limit, 1, 11); 309 310 /* Input voltages min */ 311 static SENSOR_DEVICE_ATTR_2_RW(in0_min, max16065_limit, 0, 0); 312 static SENSOR_DEVICE_ATTR_2_RW(in1_min, max16065_limit, 0, 1); 313 static SENSOR_DEVICE_ATTR_2_RW(in2_min, max16065_limit, 0, 2); 314 static SENSOR_DEVICE_ATTR_2_RW(in3_min, max16065_limit, 0, 3); 315 static SENSOR_DEVICE_ATTR_2_RW(in4_min, max16065_limit, 0, 4); 316 static SENSOR_DEVICE_ATTR_2_RW(in5_min, max16065_limit, 0, 5); 317 static SENSOR_DEVICE_ATTR_2_RW(in6_min, max16065_limit, 0, 6); 318 static SENSOR_DEVICE_ATTR_2_RW(in7_min, max16065_limit, 0, 7); 319 static SENSOR_DEVICE_ATTR_2_RW(in8_min, max16065_limit, 0, 8); 320 static SENSOR_DEVICE_ATTR_2_RW(in9_min, max16065_limit, 0, 9); 321 static SENSOR_DEVICE_ATTR_2_RW(in10_min, max16065_limit, 0, 10); 322 static SENSOR_DEVICE_ATTR_2_RW(in11_min, max16065_limit, 0, 11); 323 324 /* Input voltages max */ 325 static SENSOR_DEVICE_ATTR_2_RW(in0_max, max16065_limit, 0, 0); 326 static SENSOR_DEVICE_ATTR_2_RW(in1_max, max16065_limit, 0, 1); 327 static SENSOR_DEVICE_ATTR_2_RW(in2_max, max16065_limit, 0, 2); 328 static SENSOR_DEVICE_ATTR_2_RW(in3_max, max16065_limit, 0, 3); 329 static SENSOR_DEVICE_ATTR_2_RW(in4_max, max16065_limit, 0, 4); 330 static SENSOR_DEVICE_ATTR_2_RW(in5_max, max16065_limit, 0, 5); 331 static SENSOR_DEVICE_ATTR_2_RW(in6_max, max16065_limit, 0, 6); 332 static SENSOR_DEVICE_ATTR_2_RW(in7_max, max16065_limit, 0, 7); 333 static SENSOR_DEVICE_ATTR_2_RW(in8_max, max16065_limit, 0, 8); 334 static SENSOR_DEVICE_ATTR_2_RW(in9_max, max16065_limit, 0, 9); 335 static SENSOR_DEVICE_ATTR_2_RW(in10_max, max16065_limit, 0, 10); 336 static SENSOR_DEVICE_ATTR_2_RW(in11_max, max16065_limit, 0, 11); 337 338 /* alarms */ 339 static SENSOR_DEVICE_ATTR_2_RO(in0_alarm, max16065_alarm, 0, 0); 340 static SENSOR_DEVICE_ATTR_2_RO(in1_alarm, max16065_alarm, 0, 1); 341 static SENSOR_DEVICE_ATTR_2_RO(in2_alarm, max16065_alarm, 0, 2); 342 static SENSOR_DEVICE_ATTR_2_RO(in3_alarm, max16065_alarm, 0, 3); 343 static SENSOR_DEVICE_ATTR_2_RO(in4_alarm, max16065_alarm, 0, 4); 344 static SENSOR_DEVICE_ATTR_2_RO(in5_alarm, max16065_alarm, 0, 5); 345 static SENSOR_DEVICE_ATTR_2_RO(in6_alarm, max16065_alarm, 0, 6); 346 static SENSOR_DEVICE_ATTR_2_RO(in7_alarm, max16065_alarm, 0, 7); 347 static SENSOR_DEVICE_ATTR_2_RO(in8_alarm, max16065_alarm, 1, 0); 348 static SENSOR_DEVICE_ATTR_2_RO(in9_alarm, max16065_alarm, 1, 1); 349 static SENSOR_DEVICE_ATTR_2_RO(in10_alarm, max16065_alarm, 1, 2); 350 static SENSOR_DEVICE_ATTR_2_RO(in11_alarm, max16065_alarm, 1, 3); 351 352 /* Current and alarm */ 353 static SENSOR_DEVICE_ATTR_RO(curr1_input, max16065_current, 0); 354 static SENSOR_DEVICE_ATTR_2_RO(curr1_alarm, max16065_alarm, 1, 4); 355 356 /* 357 * Finally, construct an array of pointers to members of the above objects, 358 * as required for sysfs_create_group() 359 */ 360 static struct attribute *max16065_basic_attributes[] = { 361 &sensor_dev_attr_in0_input.dev_attr.attr, 362 &sensor_dev_attr_in0_lcrit.dev_attr.attr, 363 &sensor_dev_attr_in0_crit.dev_attr.attr, 364 &sensor_dev_attr_in0_alarm.dev_attr.attr, 365 366 &sensor_dev_attr_in1_input.dev_attr.attr, 367 &sensor_dev_attr_in1_lcrit.dev_attr.attr, 368 &sensor_dev_attr_in1_crit.dev_attr.attr, 369 &sensor_dev_attr_in1_alarm.dev_attr.attr, 370 371 &sensor_dev_attr_in2_input.dev_attr.attr, 372 &sensor_dev_attr_in2_lcrit.dev_attr.attr, 373 &sensor_dev_attr_in2_crit.dev_attr.attr, 374 &sensor_dev_attr_in2_alarm.dev_attr.attr, 375 376 &sensor_dev_attr_in3_input.dev_attr.attr, 377 &sensor_dev_attr_in3_lcrit.dev_attr.attr, 378 &sensor_dev_attr_in3_crit.dev_attr.attr, 379 &sensor_dev_attr_in3_alarm.dev_attr.attr, 380 381 &sensor_dev_attr_in4_input.dev_attr.attr, 382 &sensor_dev_attr_in4_lcrit.dev_attr.attr, 383 &sensor_dev_attr_in4_crit.dev_attr.attr, 384 &sensor_dev_attr_in4_alarm.dev_attr.attr, 385 386 &sensor_dev_attr_in5_input.dev_attr.attr, 387 &sensor_dev_attr_in5_lcrit.dev_attr.attr, 388 &sensor_dev_attr_in5_crit.dev_attr.attr, 389 &sensor_dev_attr_in5_alarm.dev_attr.attr, 390 391 &sensor_dev_attr_in6_input.dev_attr.attr, 392 &sensor_dev_attr_in6_lcrit.dev_attr.attr, 393 &sensor_dev_attr_in6_crit.dev_attr.attr, 394 &sensor_dev_attr_in6_alarm.dev_attr.attr, 395 396 &sensor_dev_attr_in7_input.dev_attr.attr, 397 &sensor_dev_attr_in7_lcrit.dev_attr.attr, 398 &sensor_dev_attr_in7_crit.dev_attr.attr, 399 &sensor_dev_attr_in7_alarm.dev_attr.attr, 400 401 &sensor_dev_attr_in8_input.dev_attr.attr, 402 &sensor_dev_attr_in8_lcrit.dev_attr.attr, 403 &sensor_dev_attr_in8_crit.dev_attr.attr, 404 &sensor_dev_attr_in8_alarm.dev_attr.attr, 405 406 &sensor_dev_attr_in9_input.dev_attr.attr, 407 &sensor_dev_attr_in9_lcrit.dev_attr.attr, 408 &sensor_dev_attr_in9_crit.dev_attr.attr, 409 &sensor_dev_attr_in9_alarm.dev_attr.attr, 410 411 &sensor_dev_attr_in10_input.dev_attr.attr, 412 &sensor_dev_attr_in10_lcrit.dev_attr.attr, 413 &sensor_dev_attr_in10_crit.dev_attr.attr, 414 &sensor_dev_attr_in10_alarm.dev_attr.attr, 415 416 &sensor_dev_attr_in11_input.dev_attr.attr, 417 &sensor_dev_attr_in11_lcrit.dev_attr.attr, 418 &sensor_dev_attr_in11_crit.dev_attr.attr, 419 &sensor_dev_attr_in11_alarm.dev_attr.attr, 420 421 NULL 422 }; 423 424 static struct attribute *max16065_current_attributes[] = { 425 &sensor_dev_attr_in12_input.dev_attr.attr, 426 &sensor_dev_attr_curr1_input.dev_attr.attr, 427 &sensor_dev_attr_curr1_alarm.dev_attr.attr, 428 NULL 429 }; 430 431 static struct attribute *max16065_min_attributes[] = { 432 &sensor_dev_attr_in0_min.dev_attr.attr, 433 &sensor_dev_attr_in1_min.dev_attr.attr, 434 &sensor_dev_attr_in2_min.dev_attr.attr, 435 &sensor_dev_attr_in3_min.dev_attr.attr, 436 &sensor_dev_attr_in4_min.dev_attr.attr, 437 &sensor_dev_attr_in5_min.dev_attr.attr, 438 &sensor_dev_attr_in6_min.dev_attr.attr, 439 &sensor_dev_attr_in7_min.dev_attr.attr, 440 &sensor_dev_attr_in8_min.dev_attr.attr, 441 &sensor_dev_attr_in9_min.dev_attr.attr, 442 &sensor_dev_attr_in10_min.dev_attr.attr, 443 &sensor_dev_attr_in11_min.dev_attr.attr, 444 NULL 445 }; 446 447 static struct attribute *max16065_max_attributes[] = { 448 &sensor_dev_attr_in0_max.dev_attr.attr, 449 &sensor_dev_attr_in1_max.dev_attr.attr, 450 &sensor_dev_attr_in2_max.dev_attr.attr, 451 &sensor_dev_attr_in3_max.dev_attr.attr, 452 &sensor_dev_attr_in4_max.dev_attr.attr, 453 &sensor_dev_attr_in5_max.dev_attr.attr, 454 &sensor_dev_attr_in6_max.dev_attr.attr, 455 &sensor_dev_attr_in7_max.dev_attr.attr, 456 &sensor_dev_attr_in8_max.dev_attr.attr, 457 &sensor_dev_attr_in9_max.dev_attr.attr, 458 &sensor_dev_attr_in10_max.dev_attr.attr, 459 &sensor_dev_attr_in11_max.dev_attr.attr, 460 NULL 461 }; 462 463 static umode_t max16065_basic_is_visible(struct kobject *kobj, 464 struct attribute *a, int n) 465 { 466 struct device *dev = kobj_to_dev(kobj); 467 struct max16065_data *data = dev_get_drvdata(dev); 468 int index = n / 4; 469 470 if (index >= data->num_adc || !data->range[index]) 471 return 0; 472 return a->mode; 473 } 474 475 static umode_t max16065_secondary_is_visible(struct kobject *kobj, 476 struct attribute *a, int index) 477 { 478 struct device *dev = kobj_to_dev(kobj); 479 struct max16065_data *data = dev_get_drvdata(dev); 480 481 if (index >= data->num_adc) 482 return 0; 483 return a->mode; 484 } 485 486 static const struct attribute_group max16065_basic_group = { 487 .attrs = max16065_basic_attributes, 488 .is_visible = max16065_basic_is_visible, 489 }; 490 491 static const struct attribute_group max16065_current_group = { 492 .attrs = max16065_current_attributes, 493 }; 494 495 static const struct attribute_group max16065_min_group = { 496 .attrs = max16065_min_attributes, 497 .is_visible = max16065_secondary_is_visible, 498 }; 499 500 static const struct attribute_group max16065_max_group = { 501 .attrs = max16065_max_attributes, 502 .is_visible = max16065_secondary_is_visible, 503 }; 504 505 static int max16065_probe(struct i2c_client *client) 506 { 507 struct i2c_adapter *adapter = client->adapter; 508 struct max16065_data *data; 509 struct device *dev = &client->dev; 510 struct device *hwmon_dev; 511 int i, j, val; 512 bool have_secondary; /* true if chip has secondary limits */ 513 bool secondary_is_max = false; /* secondary limits reflect max */ 514 int groups = 0; 515 enum chips chip = (uintptr_t)i2c_get_match_data(client); 516 517 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA 518 | I2C_FUNC_SMBUS_READ_WORD_DATA)) 519 return -ENODEV; 520 521 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); 522 if (unlikely(!data)) 523 return -ENOMEM; 524 525 data->chip = chip; 526 data->client = client; 527 mutex_init(&data->update_lock); 528 529 data->num_adc = max16065_num_adc[chip]; 530 data->have_current = max16065_have_current[chip]; 531 have_secondary = max16065_have_secondary[chip]; 532 533 if (have_secondary) { 534 val = i2c_smbus_read_byte_data(client, MAX16065_SW_ENABLE); 535 if (unlikely(val < 0)) 536 return val; 537 secondary_is_max = val & MAX16065_WARNING_OV; 538 } 539 540 /* Read scale registers, convert to range */ 541 for (i = 0; i < DIV_ROUND_UP(data->num_adc, 4); i++) { 542 val = i2c_smbus_read_byte_data(client, MAX16065_SCALE(i)); 543 if (unlikely(val < 0)) 544 return val; 545 for (j = 0; j < 4 && i * 4 + j < data->num_adc; j++) { 546 data->range[i * 4 + j] = 547 max16065_adc_range[(val >> (j * 2)) & 0x3]; 548 } 549 } 550 551 /* Read limits */ 552 for (i = 0; i < MAX16065_NUM_LIMIT; i++) { 553 if (i == 0 && !have_secondary) 554 continue; 555 556 for (j = 0; j < data->num_adc; j++) { 557 val = i2c_smbus_read_byte_data(client, 558 MAX16065_LIMIT(i, j)); 559 if (unlikely(val < 0)) 560 return val; 561 data->limit[i][j] = LIMIT_TO_MV(val, data->range[j]); 562 } 563 } 564 565 /* sysfs hooks */ 566 data->groups[groups++] = &max16065_basic_group; 567 if (have_secondary) 568 data->groups[groups++] = secondary_is_max ? 569 &max16065_max_group : &max16065_min_group; 570 571 if (data->have_current) { 572 val = i2c_smbus_read_byte_data(client, MAX16065_CURR_CONTROL); 573 if (unlikely(val < 0)) 574 return val; 575 if (val & MAX16065_CURR_ENABLE) { 576 /* 577 * Current gain is 6, 12, 24, 48 based on values in 578 * bit 2,3. 579 */ 580 data->curr_gain = 6 << ((val >> 2) & 0x03); 581 data->range[MAX16065_NUM_ADC] 582 = max16065_csp_adc_range[(val >> 1) & 0x01]; 583 data->groups[groups++] = &max16065_current_group; 584 } else { 585 data->have_current = false; 586 } 587 } 588 589 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, 590 data, data->groups); 591 return PTR_ERR_OR_ZERO(hwmon_dev); 592 } 593 594 static const struct i2c_device_id max16065_id[] = { 595 { "max16065", max16065 }, 596 { "max16066", max16066 }, 597 { "max16067", max16067 }, 598 { "max16068", max16068 }, 599 { "max16070", max16070 }, 600 { "max16071", max16071 }, 601 { } 602 }; 603 604 MODULE_DEVICE_TABLE(i2c, max16065_id); 605 606 /* This is the driver that will be inserted */ 607 static struct i2c_driver max16065_driver = { 608 .driver = { 609 .name = "max16065", 610 }, 611 .probe = max16065_probe, 612 .id_table = max16065_id, 613 }; 614 615 module_i2c_driver(max16065_driver); 616 617 MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>"); 618 MODULE_DESCRIPTION("MAX16065 driver"); 619 MODULE_LICENSE("GPL"); 620