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 type; 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(int mv, int range) 118 { 119 return clamp_val(DIV_ROUND_CLOSEST(mv * 256, range), 0, 255); 120 } 121 122 static inline int ADC_TO_CURR(int adc, int gain) 123 { 124 return adc * 1400000 / (gain * 255); 125 } 126 127 /* 128 * max16065_read_adc() 129 * 130 * Read 16 bit value from <reg>, <reg+1>. 131 * Upper 8 bits are in <reg>, lower 2 bits are in bits 7:6 of <reg+1>. 132 */ 133 static int max16065_read_adc(struct i2c_client *client, int reg) 134 { 135 int rv; 136 137 rv = i2c_smbus_read_word_swapped(client, reg); 138 if (unlikely(rv < 0)) 139 return rv; 140 return rv >> 6; 141 } 142 143 static struct max16065_data *max16065_update_device(struct device *dev) 144 { 145 struct max16065_data *data = dev_get_drvdata(dev); 146 struct i2c_client *client = data->client; 147 148 mutex_lock(&data->update_lock); 149 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { 150 int i; 151 152 for (i = 0; i < data->num_adc; i++) 153 data->adc[i] 154 = max16065_read_adc(client, MAX16065_ADC(i)); 155 156 if (data->have_current) { 157 data->adc[MAX16065_NUM_ADC] 158 = max16065_read_adc(client, MAX16065_CSP_ADC); 159 data->curr_sense 160 = i2c_smbus_read_byte_data(client, 161 MAX16065_CURR_SENSE); 162 } 163 164 for (i = 0; i < DIV_ROUND_UP(data->num_adc, 8); i++) 165 data->fault[i] 166 = i2c_smbus_read_byte_data(client, MAX16065_FAULT(i)); 167 168 data->last_updated = jiffies; 169 data->valid = true; 170 } 171 mutex_unlock(&data->update_lock); 172 return data; 173 } 174 175 static ssize_t max16065_alarm_show(struct device *dev, 176 struct device_attribute *da, char *buf) 177 { 178 struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(da); 179 struct max16065_data *data = max16065_update_device(dev); 180 int val = data->fault[attr2->nr]; 181 182 if (val < 0) 183 return val; 184 185 val &= (1 << attr2->index); 186 if (val) 187 i2c_smbus_write_byte_data(data->client, 188 MAX16065_FAULT(attr2->nr), val); 189 190 return sysfs_emit(buf, "%d\n", !!val); 191 } 192 193 static ssize_t max16065_input_show(struct device *dev, 194 struct device_attribute *da, char *buf) 195 { 196 struct sensor_device_attribute *attr = to_sensor_dev_attr(da); 197 struct max16065_data *data = max16065_update_device(dev); 198 int adc = data->adc[attr->index]; 199 200 if (unlikely(adc < 0)) 201 return adc; 202 203 return sysfs_emit(buf, "%d\n", 204 ADC_TO_MV(adc, data->range[attr->index])); 205 } 206 207 static ssize_t max16065_current_show(struct device *dev, 208 struct device_attribute *da, char *buf) 209 { 210 struct max16065_data *data = max16065_update_device(dev); 211 212 if (unlikely(data->curr_sense < 0)) 213 return data->curr_sense; 214 215 return sysfs_emit(buf, "%d\n", 216 ADC_TO_CURR(data->curr_sense, data->curr_gain)); 217 } 218 219 static ssize_t max16065_limit_store(struct device *dev, 220 struct device_attribute *da, 221 const char *buf, size_t count) 222 { 223 struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(da); 224 struct max16065_data *data = dev_get_drvdata(dev); 225 unsigned long val; 226 int err; 227 int limit; 228 229 err = kstrtoul(buf, 10, &val); 230 if (unlikely(err < 0)) 231 return err; 232 233 limit = MV_TO_LIMIT(val, data->range[attr2->index]); 234 235 mutex_lock(&data->update_lock); 236 data->limit[attr2->nr][attr2->index] 237 = LIMIT_TO_MV(limit, data->range[attr2->index]); 238 i2c_smbus_write_byte_data(data->client, 239 MAX16065_LIMIT(attr2->nr, attr2->index), 240 limit); 241 mutex_unlock(&data->update_lock); 242 243 return count; 244 } 245 246 static ssize_t max16065_limit_show(struct device *dev, 247 struct device_attribute *da, char *buf) 248 { 249 struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(da); 250 struct max16065_data *data = dev_get_drvdata(dev); 251 252 return sysfs_emit(buf, "%d\n", 253 data->limit[attr2->nr][attr2->index]); 254 } 255 256 /* Construct a sensor_device_attribute structure for each register */ 257 258 /* Input voltages */ 259 static SENSOR_DEVICE_ATTR_RO(in0_input, max16065_input, 0); 260 static SENSOR_DEVICE_ATTR_RO(in1_input, max16065_input, 1); 261 static SENSOR_DEVICE_ATTR_RO(in2_input, max16065_input, 2); 262 static SENSOR_DEVICE_ATTR_RO(in3_input, max16065_input, 3); 263 static SENSOR_DEVICE_ATTR_RO(in4_input, max16065_input, 4); 264 static SENSOR_DEVICE_ATTR_RO(in5_input, max16065_input, 5); 265 static SENSOR_DEVICE_ATTR_RO(in6_input, max16065_input, 6); 266 static SENSOR_DEVICE_ATTR_RO(in7_input, max16065_input, 7); 267 static SENSOR_DEVICE_ATTR_RO(in8_input, max16065_input, 8); 268 static SENSOR_DEVICE_ATTR_RO(in9_input, max16065_input, 9); 269 static SENSOR_DEVICE_ATTR_RO(in10_input, max16065_input, 10); 270 static SENSOR_DEVICE_ATTR_RO(in11_input, max16065_input, 11); 271 static SENSOR_DEVICE_ATTR_RO(in12_input, max16065_input, 12); 272 273 /* Input voltages lcrit */ 274 static SENSOR_DEVICE_ATTR_2_RW(in0_lcrit, max16065_limit, 2, 0); 275 static SENSOR_DEVICE_ATTR_2_RW(in1_lcrit, max16065_limit, 2, 1); 276 static SENSOR_DEVICE_ATTR_2_RW(in2_lcrit, max16065_limit, 2, 2); 277 static SENSOR_DEVICE_ATTR_2_RW(in3_lcrit, max16065_limit, 2, 3); 278 static SENSOR_DEVICE_ATTR_2_RW(in4_lcrit, max16065_limit, 2, 4); 279 static SENSOR_DEVICE_ATTR_2_RW(in5_lcrit, max16065_limit, 2, 5); 280 static SENSOR_DEVICE_ATTR_2_RW(in6_lcrit, max16065_limit, 2, 6); 281 static SENSOR_DEVICE_ATTR_2_RW(in7_lcrit, max16065_limit, 2, 7); 282 static SENSOR_DEVICE_ATTR_2_RW(in8_lcrit, max16065_limit, 2, 8); 283 static SENSOR_DEVICE_ATTR_2_RW(in9_lcrit, max16065_limit, 2, 9); 284 static SENSOR_DEVICE_ATTR_2_RW(in10_lcrit, max16065_limit, 2, 10); 285 static SENSOR_DEVICE_ATTR_2_RW(in11_lcrit, max16065_limit, 2, 11); 286 287 /* Input voltages crit */ 288 static SENSOR_DEVICE_ATTR_2_RW(in0_crit, max16065_limit, 1, 0); 289 static SENSOR_DEVICE_ATTR_2_RW(in1_crit, max16065_limit, 1, 1); 290 static SENSOR_DEVICE_ATTR_2_RW(in2_crit, max16065_limit, 1, 2); 291 static SENSOR_DEVICE_ATTR_2_RW(in3_crit, max16065_limit, 1, 3); 292 static SENSOR_DEVICE_ATTR_2_RW(in4_crit, max16065_limit, 1, 4); 293 static SENSOR_DEVICE_ATTR_2_RW(in5_crit, max16065_limit, 1, 5); 294 static SENSOR_DEVICE_ATTR_2_RW(in6_crit, max16065_limit, 1, 6); 295 static SENSOR_DEVICE_ATTR_2_RW(in7_crit, max16065_limit, 1, 7); 296 static SENSOR_DEVICE_ATTR_2_RW(in8_crit, max16065_limit, 1, 8); 297 static SENSOR_DEVICE_ATTR_2_RW(in9_crit, max16065_limit, 1, 9); 298 static SENSOR_DEVICE_ATTR_2_RW(in10_crit, max16065_limit, 1, 10); 299 static SENSOR_DEVICE_ATTR_2_RW(in11_crit, max16065_limit, 1, 11); 300 301 /* Input voltages min */ 302 static SENSOR_DEVICE_ATTR_2_RW(in0_min, max16065_limit, 0, 0); 303 static SENSOR_DEVICE_ATTR_2_RW(in1_min, max16065_limit, 0, 1); 304 static SENSOR_DEVICE_ATTR_2_RW(in2_min, max16065_limit, 0, 2); 305 static SENSOR_DEVICE_ATTR_2_RW(in3_min, max16065_limit, 0, 3); 306 static SENSOR_DEVICE_ATTR_2_RW(in4_min, max16065_limit, 0, 4); 307 static SENSOR_DEVICE_ATTR_2_RW(in5_min, max16065_limit, 0, 5); 308 static SENSOR_DEVICE_ATTR_2_RW(in6_min, max16065_limit, 0, 6); 309 static SENSOR_DEVICE_ATTR_2_RW(in7_min, max16065_limit, 0, 7); 310 static SENSOR_DEVICE_ATTR_2_RW(in8_min, max16065_limit, 0, 8); 311 static SENSOR_DEVICE_ATTR_2_RW(in9_min, max16065_limit, 0, 9); 312 static SENSOR_DEVICE_ATTR_2_RW(in10_min, max16065_limit, 0, 10); 313 static SENSOR_DEVICE_ATTR_2_RW(in11_min, max16065_limit, 0, 11); 314 315 /* Input voltages max */ 316 static SENSOR_DEVICE_ATTR_2_RW(in0_max, max16065_limit, 0, 0); 317 static SENSOR_DEVICE_ATTR_2_RW(in1_max, max16065_limit, 0, 1); 318 static SENSOR_DEVICE_ATTR_2_RW(in2_max, max16065_limit, 0, 2); 319 static SENSOR_DEVICE_ATTR_2_RW(in3_max, max16065_limit, 0, 3); 320 static SENSOR_DEVICE_ATTR_2_RW(in4_max, max16065_limit, 0, 4); 321 static SENSOR_DEVICE_ATTR_2_RW(in5_max, max16065_limit, 0, 5); 322 static SENSOR_DEVICE_ATTR_2_RW(in6_max, max16065_limit, 0, 6); 323 static SENSOR_DEVICE_ATTR_2_RW(in7_max, max16065_limit, 0, 7); 324 static SENSOR_DEVICE_ATTR_2_RW(in8_max, max16065_limit, 0, 8); 325 static SENSOR_DEVICE_ATTR_2_RW(in9_max, max16065_limit, 0, 9); 326 static SENSOR_DEVICE_ATTR_2_RW(in10_max, max16065_limit, 0, 10); 327 static SENSOR_DEVICE_ATTR_2_RW(in11_max, max16065_limit, 0, 11); 328 329 /* alarms */ 330 static SENSOR_DEVICE_ATTR_2_RO(in0_alarm, max16065_alarm, 0, 0); 331 static SENSOR_DEVICE_ATTR_2_RO(in1_alarm, max16065_alarm, 0, 1); 332 static SENSOR_DEVICE_ATTR_2_RO(in2_alarm, max16065_alarm, 0, 2); 333 static SENSOR_DEVICE_ATTR_2_RO(in3_alarm, max16065_alarm, 0, 3); 334 static SENSOR_DEVICE_ATTR_2_RO(in4_alarm, max16065_alarm, 0, 4); 335 static SENSOR_DEVICE_ATTR_2_RO(in5_alarm, max16065_alarm, 0, 5); 336 static SENSOR_DEVICE_ATTR_2_RO(in6_alarm, max16065_alarm, 0, 6); 337 static SENSOR_DEVICE_ATTR_2_RO(in7_alarm, max16065_alarm, 0, 7); 338 static SENSOR_DEVICE_ATTR_2_RO(in8_alarm, max16065_alarm, 1, 0); 339 static SENSOR_DEVICE_ATTR_2_RO(in9_alarm, max16065_alarm, 1, 1); 340 static SENSOR_DEVICE_ATTR_2_RO(in10_alarm, max16065_alarm, 1, 2); 341 static SENSOR_DEVICE_ATTR_2_RO(in11_alarm, max16065_alarm, 1, 3); 342 343 /* Current and alarm */ 344 static SENSOR_DEVICE_ATTR_RO(curr1_input, max16065_current, 0); 345 static SENSOR_DEVICE_ATTR_2_RO(curr1_alarm, max16065_alarm, 1, 4); 346 347 /* 348 * Finally, construct an array of pointers to members of the above objects, 349 * as required for sysfs_create_group() 350 */ 351 static struct attribute *max16065_basic_attributes[] = { 352 &sensor_dev_attr_in0_input.dev_attr.attr, 353 &sensor_dev_attr_in0_lcrit.dev_attr.attr, 354 &sensor_dev_attr_in0_crit.dev_attr.attr, 355 &sensor_dev_attr_in0_alarm.dev_attr.attr, 356 357 &sensor_dev_attr_in1_input.dev_attr.attr, 358 &sensor_dev_attr_in1_lcrit.dev_attr.attr, 359 &sensor_dev_attr_in1_crit.dev_attr.attr, 360 &sensor_dev_attr_in1_alarm.dev_attr.attr, 361 362 &sensor_dev_attr_in2_input.dev_attr.attr, 363 &sensor_dev_attr_in2_lcrit.dev_attr.attr, 364 &sensor_dev_attr_in2_crit.dev_attr.attr, 365 &sensor_dev_attr_in2_alarm.dev_attr.attr, 366 367 &sensor_dev_attr_in3_input.dev_attr.attr, 368 &sensor_dev_attr_in3_lcrit.dev_attr.attr, 369 &sensor_dev_attr_in3_crit.dev_attr.attr, 370 &sensor_dev_attr_in3_alarm.dev_attr.attr, 371 372 &sensor_dev_attr_in4_input.dev_attr.attr, 373 &sensor_dev_attr_in4_lcrit.dev_attr.attr, 374 &sensor_dev_attr_in4_crit.dev_attr.attr, 375 &sensor_dev_attr_in4_alarm.dev_attr.attr, 376 377 &sensor_dev_attr_in5_input.dev_attr.attr, 378 &sensor_dev_attr_in5_lcrit.dev_attr.attr, 379 &sensor_dev_attr_in5_crit.dev_attr.attr, 380 &sensor_dev_attr_in5_alarm.dev_attr.attr, 381 382 &sensor_dev_attr_in6_input.dev_attr.attr, 383 &sensor_dev_attr_in6_lcrit.dev_attr.attr, 384 &sensor_dev_attr_in6_crit.dev_attr.attr, 385 &sensor_dev_attr_in6_alarm.dev_attr.attr, 386 387 &sensor_dev_attr_in7_input.dev_attr.attr, 388 &sensor_dev_attr_in7_lcrit.dev_attr.attr, 389 &sensor_dev_attr_in7_crit.dev_attr.attr, 390 &sensor_dev_attr_in7_alarm.dev_attr.attr, 391 392 &sensor_dev_attr_in8_input.dev_attr.attr, 393 &sensor_dev_attr_in8_lcrit.dev_attr.attr, 394 &sensor_dev_attr_in8_crit.dev_attr.attr, 395 &sensor_dev_attr_in8_alarm.dev_attr.attr, 396 397 &sensor_dev_attr_in9_input.dev_attr.attr, 398 &sensor_dev_attr_in9_lcrit.dev_attr.attr, 399 &sensor_dev_attr_in9_crit.dev_attr.attr, 400 &sensor_dev_attr_in9_alarm.dev_attr.attr, 401 402 &sensor_dev_attr_in10_input.dev_attr.attr, 403 &sensor_dev_attr_in10_lcrit.dev_attr.attr, 404 &sensor_dev_attr_in10_crit.dev_attr.attr, 405 &sensor_dev_attr_in10_alarm.dev_attr.attr, 406 407 &sensor_dev_attr_in11_input.dev_attr.attr, 408 &sensor_dev_attr_in11_lcrit.dev_attr.attr, 409 &sensor_dev_attr_in11_crit.dev_attr.attr, 410 &sensor_dev_attr_in11_alarm.dev_attr.attr, 411 412 NULL 413 }; 414 415 static struct attribute *max16065_current_attributes[] = { 416 &sensor_dev_attr_in12_input.dev_attr.attr, 417 &sensor_dev_attr_curr1_input.dev_attr.attr, 418 &sensor_dev_attr_curr1_alarm.dev_attr.attr, 419 NULL 420 }; 421 422 static struct attribute *max16065_min_attributes[] = { 423 &sensor_dev_attr_in0_min.dev_attr.attr, 424 &sensor_dev_attr_in1_min.dev_attr.attr, 425 &sensor_dev_attr_in2_min.dev_attr.attr, 426 &sensor_dev_attr_in3_min.dev_attr.attr, 427 &sensor_dev_attr_in4_min.dev_attr.attr, 428 &sensor_dev_attr_in5_min.dev_attr.attr, 429 &sensor_dev_attr_in6_min.dev_attr.attr, 430 &sensor_dev_attr_in7_min.dev_attr.attr, 431 &sensor_dev_attr_in8_min.dev_attr.attr, 432 &sensor_dev_attr_in9_min.dev_attr.attr, 433 &sensor_dev_attr_in10_min.dev_attr.attr, 434 &sensor_dev_attr_in11_min.dev_attr.attr, 435 NULL 436 }; 437 438 static struct attribute *max16065_max_attributes[] = { 439 &sensor_dev_attr_in0_max.dev_attr.attr, 440 &sensor_dev_attr_in1_max.dev_attr.attr, 441 &sensor_dev_attr_in2_max.dev_attr.attr, 442 &sensor_dev_attr_in3_max.dev_attr.attr, 443 &sensor_dev_attr_in4_max.dev_attr.attr, 444 &sensor_dev_attr_in5_max.dev_attr.attr, 445 &sensor_dev_attr_in6_max.dev_attr.attr, 446 &sensor_dev_attr_in7_max.dev_attr.attr, 447 &sensor_dev_attr_in8_max.dev_attr.attr, 448 &sensor_dev_attr_in9_max.dev_attr.attr, 449 &sensor_dev_attr_in10_max.dev_attr.attr, 450 &sensor_dev_attr_in11_max.dev_attr.attr, 451 NULL 452 }; 453 454 static umode_t max16065_basic_is_visible(struct kobject *kobj, 455 struct attribute *a, int n) 456 { 457 struct device *dev = kobj_to_dev(kobj); 458 struct max16065_data *data = dev_get_drvdata(dev); 459 int index = n / 4; 460 461 if (index >= data->num_adc || !data->range[index]) 462 return 0; 463 return a->mode; 464 } 465 466 static umode_t max16065_secondary_is_visible(struct kobject *kobj, 467 struct attribute *a, int index) 468 { 469 struct device *dev = kobj_to_dev(kobj); 470 struct max16065_data *data = dev_get_drvdata(dev); 471 472 if (index >= data->num_adc) 473 return 0; 474 return a->mode; 475 } 476 477 static const struct attribute_group max16065_basic_group = { 478 .attrs = max16065_basic_attributes, 479 .is_visible = max16065_basic_is_visible, 480 }; 481 482 static const struct attribute_group max16065_current_group = { 483 .attrs = max16065_current_attributes, 484 }; 485 486 static const struct attribute_group max16065_min_group = { 487 .attrs = max16065_min_attributes, 488 .is_visible = max16065_secondary_is_visible, 489 }; 490 491 static const struct attribute_group max16065_max_group = { 492 .attrs = max16065_max_attributes, 493 .is_visible = max16065_secondary_is_visible, 494 }; 495 496 static const struct i2c_device_id max16065_id[]; 497 498 static int max16065_probe(struct i2c_client *client) 499 { 500 struct i2c_adapter *adapter = client->adapter; 501 struct max16065_data *data; 502 struct device *dev = &client->dev; 503 struct device *hwmon_dev; 504 int i, j, val; 505 bool have_secondary; /* true if chip has secondary limits */ 506 bool secondary_is_max = false; /* secondary limits reflect max */ 507 int groups = 0; 508 const struct i2c_device_id *id = i2c_match_id(max16065_id, client); 509 510 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA 511 | I2C_FUNC_SMBUS_READ_WORD_DATA)) 512 return -ENODEV; 513 514 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); 515 if (unlikely(!data)) 516 return -ENOMEM; 517 518 data->client = client; 519 mutex_init(&data->update_lock); 520 521 data->num_adc = max16065_num_adc[id->driver_data]; 522 data->have_current = max16065_have_current[id->driver_data]; 523 have_secondary = max16065_have_secondary[id->driver_data]; 524 525 if (have_secondary) { 526 val = i2c_smbus_read_byte_data(client, MAX16065_SW_ENABLE); 527 if (unlikely(val < 0)) 528 return val; 529 secondary_is_max = val & MAX16065_WARNING_OV; 530 } 531 532 /* Read scale registers, convert to range */ 533 for (i = 0; i < DIV_ROUND_UP(data->num_adc, 4); i++) { 534 val = i2c_smbus_read_byte_data(client, MAX16065_SCALE(i)); 535 if (unlikely(val < 0)) 536 return val; 537 for (j = 0; j < 4 && i * 4 + j < data->num_adc; j++) { 538 data->range[i * 4 + j] = 539 max16065_adc_range[(val >> (j * 2)) & 0x3]; 540 } 541 } 542 543 /* Read limits */ 544 for (i = 0; i < MAX16065_NUM_LIMIT; i++) { 545 if (i == 0 && !have_secondary) 546 continue; 547 548 for (j = 0; j < data->num_adc; j++) { 549 val = i2c_smbus_read_byte_data(client, 550 MAX16065_LIMIT(i, j)); 551 if (unlikely(val < 0)) 552 return val; 553 data->limit[i][j] = LIMIT_TO_MV(val, data->range[j]); 554 } 555 } 556 557 /* sysfs hooks */ 558 data->groups[groups++] = &max16065_basic_group; 559 if (have_secondary) 560 data->groups[groups++] = secondary_is_max ? 561 &max16065_max_group : &max16065_min_group; 562 563 if (data->have_current) { 564 val = i2c_smbus_read_byte_data(client, MAX16065_CURR_CONTROL); 565 if (unlikely(val < 0)) 566 return val; 567 if (val & MAX16065_CURR_ENABLE) { 568 /* 569 * Current gain is 6, 12, 24, 48 based on values in 570 * bit 2,3. 571 */ 572 data->curr_gain = 6 << ((val >> 2) & 0x03); 573 data->range[MAX16065_NUM_ADC] 574 = max16065_csp_adc_range[(val >> 1) & 0x01]; 575 data->groups[groups++] = &max16065_current_group; 576 } else { 577 data->have_current = false; 578 } 579 } 580 581 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, 582 data, data->groups); 583 return PTR_ERR_OR_ZERO(hwmon_dev); 584 } 585 586 static const struct i2c_device_id max16065_id[] = { 587 { "max16065", max16065 }, 588 { "max16066", max16066 }, 589 { "max16067", max16067 }, 590 { "max16068", max16068 }, 591 { "max16070", max16070 }, 592 { "max16071", max16071 }, 593 { } 594 }; 595 596 MODULE_DEVICE_TABLE(i2c, max16065_id); 597 598 /* This is the driver that will be inserted */ 599 static struct i2c_driver max16065_driver = { 600 .driver = { 601 .name = "max16065", 602 }, 603 .probe = max16065_probe, 604 .id_table = max16065_id, 605 }; 606 607 module_i2c_driver(max16065_driver); 608 609 MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>"); 610 MODULE_DESCRIPTION("MAX16065 driver"); 611 MODULE_LICENSE("GPL"); 612