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