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_show_alarm(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_show_input(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_show_current(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_set_limit(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_show_limit(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(in0_input, S_IRUGO, max16065_show_input, NULL, 0); 263 static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, max16065_show_input, NULL, 1); 264 static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, max16065_show_input, NULL, 2); 265 static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, max16065_show_input, NULL, 3); 266 static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, max16065_show_input, NULL, 4); 267 static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, max16065_show_input, NULL, 5); 268 static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, max16065_show_input, NULL, 6); 269 static SENSOR_DEVICE_ATTR(in7_input, S_IRUGO, max16065_show_input, NULL, 7); 270 static SENSOR_DEVICE_ATTR(in8_input, S_IRUGO, max16065_show_input, NULL, 8); 271 static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO, max16065_show_input, NULL, 9); 272 static SENSOR_DEVICE_ATTR(in10_input, S_IRUGO, max16065_show_input, NULL, 10); 273 static SENSOR_DEVICE_ATTR(in11_input, S_IRUGO, max16065_show_input, NULL, 11); 274 static SENSOR_DEVICE_ATTR(in12_input, S_IRUGO, max16065_show_input, NULL, 12); 275 276 /* Input voltages lcrit */ 277 static SENSOR_DEVICE_ATTR_2(in0_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit, 278 max16065_set_limit, 2, 0); 279 static SENSOR_DEVICE_ATTR_2(in1_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit, 280 max16065_set_limit, 2, 1); 281 static SENSOR_DEVICE_ATTR_2(in2_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit, 282 max16065_set_limit, 2, 2); 283 static SENSOR_DEVICE_ATTR_2(in3_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit, 284 max16065_set_limit, 2, 3); 285 static SENSOR_DEVICE_ATTR_2(in4_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit, 286 max16065_set_limit, 2, 4); 287 static SENSOR_DEVICE_ATTR_2(in5_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit, 288 max16065_set_limit, 2, 5); 289 static SENSOR_DEVICE_ATTR_2(in6_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit, 290 max16065_set_limit, 2, 6); 291 static SENSOR_DEVICE_ATTR_2(in7_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit, 292 max16065_set_limit, 2, 7); 293 static SENSOR_DEVICE_ATTR_2(in8_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit, 294 max16065_set_limit, 2, 8); 295 static SENSOR_DEVICE_ATTR_2(in9_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit, 296 max16065_set_limit, 2, 9); 297 static SENSOR_DEVICE_ATTR_2(in10_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit, 298 max16065_set_limit, 2, 10); 299 static SENSOR_DEVICE_ATTR_2(in11_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit, 300 max16065_set_limit, 2, 11); 301 302 /* Input voltages crit */ 303 static SENSOR_DEVICE_ATTR_2(in0_crit, S_IWUSR | S_IRUGO, max16065_show_limit, 304 max16065_set_limit, 1, 0); 305 static SENSOR_DEVICE_ATTR_2(in1_crit, S_IWUSR | S_IRUGO, max16065_show_limit, 306 max16065_set_limit, 1, 1); 307 static SENSOR_DEVICE_ATTR_2(in2_crit, S_IWUSR | S_IRUGO, max16065_show_limit, 308 max16065_set_limit, 1, 2); 309 static SENSOR_DEVICE_ATTR_2(in3_crit, S_IWUSR | S_IRUGO, max16065_show_limit, 310 max16065_set_limit, 1, 3); 311 static SENSOR_DEVICE_ATTR_2(in4_crit, S_IWUSR | S_IRUGO, max16065_show_limit, 312 max16065_set_limit, 1, 4); 313 static SENSOR_DEVICE_ATTR_2(in5_crit, S_IWUSR | S_IRUGO, max16065_show_limit, 314 max16065_set_limit, 1, 5); 315 static SENSOR_DEVICE_ATTR_2(in6_crit, S_IWUSR | S_IRUGO, max16065_show_limit, 316 max16065_set_limit, 1, 6); 317 static SENSOR_DEVICE_ATTR_2(in7_crit, S_IWUSR | S_IRUGO, max16065_show_limit, 318 max16065_set_limit, 1, 7); 319 static SENSOR_DEVICE_ATTR_2(in8_crit, S_IWUSR | S_IRUGO, max16065_show_limit, 320 max16065_set_limit, 1, 8); 321 static SENSOR_DEVICE_ATTR_2(in9_crit, S_IWUSR | S_IRUGO, max16065_show_limit, 322 max16065_set_limit, 1, 9); 323 static SENSOR_DEVICE_ATTR_2(in10_crit, S_IWUSR | S_IRUGO, max16065_show_limit, 324 max16065_set_limit, 1, 10); 325 static SENSOR_DEVICE_ATTR_2(in11_crit, S_IWUSR | S_IRUGO, max16065_show_limit, 326 max16065_set_limit, 1, 11); 327 328 /* Input voltages min */ 329 static SENSOR_DEVICE_ATTR_2(in0_min, S_IWUSR | S_IRUGO, max16065_show_limit, 330 max16065_set_limit, 0, 0); 331 static SENSOR_DEVICE_ATTR_2(in1_min, S_IWUSR | S_IRUGO, max16065_show_limit, 332 max16065_set_limit, 0, 1); 333 static SENSOR_DEVICE_ATTR_2(in2_min, S_IWUSR | S_IRUGO, max16065_show_limit, 334 max16065_set_limit, 0, 2); 335 static SENSOR_DEVICE_ATTR_2(in3_min, S_IWUSR | S_IRUGO, max16065_show_limit, 336 max16065_set_limit, 0, 3); 337 static SENSOR_DEVICE_ATTR_2(in4_min, S_IWUSR | S_IRUGO, max16065_show_limit, 338 max16065_set_limit, 0, 4); 339 static SENSOR_DEVICE_ATTR_2(in5_min, S_IWUSR | S_IRUGO, max16065_show_limit, 340 max16065_set_limit, 0, 5); 341 static SENSOR_DEVICE_ATTR_2(in6_min, S_IWUSR | S_IRUGO, max16065_show_limit, 342 max16065_set_limit, 0, 6); 343 static SENSOR_DEVICE_ATTR_2(in7_min, S_IWUSR | S_IRUGO, max16065_show_limit, 344 max16065_set_limit, 0, 7); 345 static SENSOR_DEVICE_ATTR_2(in8_min, S_IWUSR | S_IRUGO, max16065_show_limit, 346 max16065_set_limit, 0, 8); 347 static SENSOR_DEVICE_ATTR_2(in9_min, S_IWUSR | S_IRUGO, max16065_show_limit, 348 max16065_set_limit, 0, 9); 349 static SENSOR_DEVICE_ATTR_2(in10_min, S_IWUSR | S_IRUGO, max16065_show_limit, 350 max16065_set_limit, 0, 10); 351 static SENSOR_DEVICE_ATTR_2(in11_min, S_IWUSR | S_IRUGO, max16065_show_limit, 352 max16065_set_limit, 0, 11); 353 354 /* Input voltages max */ 355 static SENSOR_DEVICE_ATTR_2(in0_max, S_IWUSR | S_IRUGO, max16065_show_limit, 356 max16065_set_limit, 0, 0); 357 static SENSOR_DEVICE_ATTR_2(in1_max, S_IWUSR | S_IRUGO, max16065_show_limit, 358 max16065_set_limit, 0, 1); 359 static SENSOR_DEVICE_ATTR_2(in2_max, S_IWUSR | S_IRUGO, max16065_show_limit, 360 max16065_set_limit, 0, 2); 361 static SENSOR_DEVICE_ATTR_2(in3_max, S_IWUSR | S_IRUGO, max16065_show_limit, 362 max16065_set_limit, 0, 3); 363 static SENSOR_DEVICE_ATTR_2(in4_max, S_IWUSR | S_IRUGO, max16065_show_limit, 364 max16065_set_limit, 0, 4); 365 static SENSOR_DEVICE_ATTR_2(in5_max, S_IWUSR | S_IRUGO, max16065_show_limit, 366 max16065_set_limit, 0, 5); 367 static SENSOR_DEVICE_ATTR_2(in6_max, S_IWUSR | S_IRUGO, max16065_show_limit, 368 max16065_set_limit, 0, 6); 369 static SENSOR_DEVICE_ATTR_2(in7_max, S_IWUSR | S_IRUGO, max16065_show_limit, 370 max16065_set_limit, 0, 7); 371 static SENSOR_DEVICE_ATTR_2(in8_max, S_IWUSR | S_IRUGO, max16065_show_limit, 372 max16065_set_limit, 0, 8); 373 static SENSOR_DEVICE_ATTR_2(in9_max, S_IWUSR | S_IRUGO, max16065_show_limit, 374 max16065_set_limit, 0, 9); 375 static SENSOR_DEVICE_ATTR_2(in10_max, S_IWUSR | S_IRUGO, max16065_show_limit, 376 max16065_set_limit, 0, 10); 377 static SENSOR_DEVICE_ATTR_2(in11_max, S_IWUSR | S_IRUGO, max16065_show_limit, 378 max16065_set_limit, 0, 11); 379 380 /* alarms */ 381 static SENSOR_DEVICE_ATTR_2(in0_alarm, S_IRUGO, max16065_show_alarm, NULL, 382 0, 0); 383 static SENSOR_DEVICE_ATTR_2(in1_alarm, S_IRUGO, max16065_show_alarm, NULL, 384 0, 1); 385 static SENSOR_DEVICE_ATTR_2(in2_alarm, S_IRUGO, max16065_show_alarm, NULL, 386 0, 2); 387 static SENSOR_DEVICE_ATTR_2(in3_alarm, S_IRUGO, max16065_show_alarm, NULL, 388 0, 3); 389 static SENSOR_DEVICE_ATTR_2(in4_alarm, S_IRUGO, max16065_show_alarm, NULL, 390 0, 4); 391 static SENSOR_DEVICE_ATTR_2(in5_alarm, S_IRUGO, max16065_show_alarm, NULL, 392 0, 5); 393 static SENSOR_DEVICE_ATTR_2(in6_alarm, S_IRUGO, max16065_show_alarm, NULL, 394 0, 6); 395 static SENSOR_DEVICE_ATTR_2(in7_alarm, S_IRUGO, max16065_show_alarm, NULL, 396 0, 7); 397 static SENSOR_DEVICE_ATTR_2(in8_alarm, S_IRUGO, max16065_show_alarm, NULL, 398 1, 0); 399 static SENSOR_DEVICE_ATTR_2(in9_alarm, S_IRUGO, max16065_show_alarm, NULL, 400 1, 1); 401 static SENSOR_DEVICE_ATTR_2(in10_alarm, S_IRUGO, max16065_show_alarm, NULL, 402 1, 2); 403 static SENSOR_DEVICE_ATTR_2(in11_alarm, S_IRUGO, max16065_show_alarm, NULL, 404 1, 3); 405 406 /* Current and alarm */ 407 static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, max16065_show_current, NULL, 0); 408 static SENSOR_DEVICE_ATTR_2(curr1_alarm, S_IRUGO, max16065_show_alarm, NULL, 409 1, 4); 410 411 /* 412 * Finally, construct an array of pointers to members of the above objects, 413 * as required for sysfs_create_group() 414 */ 415 static struct attribute *max16065_basic_attributes[] = { 416 &sensor_dev_attr_in0_input.dev_attr.attr, 417 &sensor_dev_attr_in0_lcrit.dev_attr.attr, 418 &sensor_dev_attr_in0_crit.dev_attr.attr, 419 &sensor_dev_attr_in0_alarm.dev_attr.attr, 420 421 &sensor_dev_attr_in1_input.dev_attr.attr, 422 &sensor_dev_attr_in1_lcrit.dev_attr.attr, 423 &sensor_dev_attr_in1_crit.dev_attr.attr, 424 &sensor_dev_attr_in1_alarm.dev_attr.attr, 425 426 &sensor_dev_attr_in2_input.dev_attr.attr, 427 &sensor_dev_attr_in2_lcrit.dev_attr.attr, 428 &sensor_dev_attr_in2_crit.dev_attr.attr, 429 &sensor_dev_attr_in2_alarm.dev_attr.attr, 430 431 &sensor_dev_attr_in3_input.dev_attr.attr, 432 &sensor_dev_attr_in3_lcrit.dev_attr.attr, 433 &sensor_dev_attr_in3_crit.dev_attr.attr, 434 &sensor_dev_attr_in3_alarm.dev_attr.attr, 435 436 &sensor_dev_attr_in4_input.dev_attr.attr, 437 &sensor_dev_attr_in4_lcrit.dev_attr.attr, 438 &sensor_dev_attr_in4_crit.dev_attr.attr, 439 &sensor_dev_attr_in4_alarm.dev_attr.attr, 440 441 &sensor_dev_attr_in5_input.dev_attr.attr, 442 &sensor_dev_attr_in5_lcrit.dev_attr.attr, 443 &sensor_dev_attr_in5_crit.dev_attr.attr, 444 &sensor_dev_attr_in5_alarm.dev_attr.attr, 445 446 &sensor_dev_attr_in6_input.dev_attr.attr, 447 &sensor_dev_attr_in6_lcrit.dev_attr.attr, 448 &sensor_dev_attr_in6_crit.dev_attr.attr, 449 &sensor_dev_attr_in6_alarm.dev_attr.attr, 450 451 &sensor_dev_attr_in7_input.dev_attr.attr, 452 &sensor_dev_attr_in7_lcrit.dev_attr.attr, 453 &sensor_dev_attr_in7_crit.dev_attr.attr, 454 &sensor_dev_attr_in7_alarm.dev_attr.attr, 455 456 &sensor_dev_attr_in8_input.dev_attr.attr, 457 &sensor_dev_attr_in8_lcrit.dev_attr.attr, 458 &sensor_dev_attr_in8_crit.dev_attr.attr, 459 &sensor_dev_attr_in8_alarm.dev_attr.attr, 460 461 &sensor_dev_attr_in9_input.dev_attr.attr, 462 &sensor_dev_attr_in9_lcrit.dev_attr.attr, 463 &sensor_dev_attr_in9_crit.dev_attr.attr, 464 &sensor_dev_attr_in9_alarm.dev_attr.attr, 465 466 &sensor_dev_attr_in10_input.dev_attr.attr, 467 &sensor_dev_attr_in10_lcrit.dev_attr.attr, 468 &sensor_dev_attr_in10_crit.dev_attr.attr, 469 &sensor_dev_attr_in10_alarm.dev_attr.attr, 470 471 &sensor_dev_attr_in11_input.dev_attr.attr, 472 &sensor_dev_attr_in11_lcrit.dev_attr.attr, 473 &sensor_dev_attr_in11_crit.dev_attr.attr, 474 &sensor_dev_attr_in11_alarm.dev_attr.attr, 475 476 NULL 477 }; 478 479 static struct attribute *max16065_current_attributes[] = { 480 &sensor_dev_attr_in12_input.dev_attr.attr, 481 &sensor_dev_attr_curr1_input.dev_attr.attr, 482 &sensor_dev_attr_curr1_alarm.dev_attr.attr, 483 NULL 484 }; 485 486 static struct attribute *max16065_min_attributes[] = { 487 &sensor_dev_attr_in0_min.dev_attr.attr, 488 &sensor_dev_attr_in1_min.dev_attr.attr, 489 &sensor_dev_attr_in2_min.dev_attr.attr, 490 &sensor_dev_attr_in3_min.dev_attr.attr, 491 &sensor_dev_attr_in4_min.dev_attr.attr, 492 &sensor_dev_attr_in5_min.dev_attr.attr, 493 &sensor_dev_attr_in6_min.dev_attr.attr, 494 &sensor_dev_attr_in7_min.dev_attr.attr, 495 &sensor_dev_attr_in8_min.dev_attr.attr, 496 &sensor_dev_attr_in9_min.dev_attr.attr, 497 &sensor_dev_attr_in10_min.dev_attr.attr, 498 &sensor_dev_attr_in11_min.dev_attr.attr, 499 NULL 500 }; 501 502 static struct attribute *max16065_max_attributes[] = { 503 &sensor_dev_attr_in0_max.dev_attr.attr, 504 &sensor_dev_attr_in1_max.dev_attr.attr, 505 &sensor_dev_attr_in2_max.dev_attr.attr, 506 &sensor_dev_attr_in3_max.dev_attr.attr, 507 &sensor_dev_attr_in4_max.dev_attr.attr, 508 &sensor_dev_attr_in5_max.dev_attr.attr, 509 &sensor_dev_attr_in6_max.dev_attr.attr, 510 &sensor_dev_attr_in7_max.dev_attr.attr, 511 &sensor_dev_attr_in8_max.dev_attr.attr, 512 &sensor_dev_attr_in9_max.dev_attr.attr, 513 &sensor_dev_attr_in10_max.dev_attr.attr, 514 &sensor_dev_attr_in11_max.dev_attr.attr, 515 NULL 516 }; 517 518 static umode_t max16065_basic_is_visible(struct kobject *kobj, 519 struct attribute *a, int n) 520 { 521 struct device *dev = container_of(kobj, struct device, kobj); 522 struct max16065_data *data = dev_get_drvdata(dev); 523 int index = n / 4; 524 525 if (index >= data->num_adc || !data->range[index]) 526 return 0; 527 return a->mode; 528 } 529 530 static umode_t max16065_secondary_is_visible(struct kobject *kobj, 531 struct attribute *a, int index) 532 { 533 struct device *dev = container_of(kobj, struct device, kobj); 534 struct max16065_data *data = dev_get_drvdata(dev); 535 536 if (index >= data->num_adc) 537 return 0; 538 return a->mode; 539 } 540 541 static const struct attribute_group max16065_basic_group = { 542 .attrs = max16065_basic_attributes, 543 .is_visible = max16065_basic_is_visible, 544 }; 545 546 static const struct attribute_group max16065_current_group = { 547 .attrs = max16065_current_attributes, 548 }; 549 550 static const struct attribute_group max16065_min_group = { 551 .attrs = max16065_min_attributes, 552 .is_visible = max16065_secondary_is_visible, 553 }; 554 555 static const struct attribute_group max16065_max_group = { 556 .attrs = max16065_max_attributes, 557 .is_visible = max16065_secondary_is_visible, 558 }; 559 560 static int max16065_probe(struct i2c_client *client, 561 const struct i2c_device_id *id) 562 { 563 struct i2c_adapter *adapter = client->adapter; 564 struct max16065_data *data; 565 struct device *dev = &client->dev; 566 struct device *hwmon_dev; 567 int i, j, val; 568 bool have_secondary; /* true if chip has secondary limits */ 569 bool secondary_is_max = false; /* secondary limits reflect max */ 570 int groups = 0; 571 572 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA 573 | I2C_FUNC_SMBUS_READ_WORD_DATA)) 574 return -ENODEV; 575 576 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); 577 if (unlikely(!data)) 578 return -ENOMEM; 579 580 data->client = client; 581 mutex_init(&data->update_lock); 582 583 data->num_adc = max16065_num_adc[id->driver_data]; 584 data->have_current = max16065_have_current[id->driver_data]; 585 have_secondary = max16065_have_secondary[id->driver_data]; 586 587 if (have_secondary) { 588 val = i2c_smbus_read_byte_data(client, MAX16065_SW_ENABLE); 589 if (unlikely(val < 0)) 590 return val; 591 secondary_is_max = val & MAX16065_WARNING_OV; 592 } 593 594 /* Read scale registers, convert to range */ 595 for (i = 0; i < DIV_ROUND_UP(data->num_adc, 4); i++) { 596 val = i2c_smbus_read_byte_data(client, MAX16065_SCALE(i)); 597 if (unlikely(val < 0)) 598 return val; 599 for (j = 0; j < 4 && i * 4 + j < data->num_adc; j++) { 600 data->range[i * 4 + j] = 601 max16065_adc_range[(val >> (j * 2)) & 0x3]; 602 } 603 } 604 605 /* Read limits */ 606 for (i = 0; i < MAX16065_NUM_LIMIT; i++) { 607 if (i == 0 && !have_secondary) 608 continue; 609 610 for (j = 0; j < data->num_adc; j++) { 611 val = i2c_smbus_read_byte_data(client, 612 MAX16065_LIMIT(i, j)); 613 if (unlikely(val < 0)) 614 return val; 615 data->limit[i][j] = LIMIT_TO_MV(val, data->range[j]); 616 } 617 } 618 619 /* sysfs hooks */ 620 data->groups[groups++] = &max16065_basic_group; 621 if (have_secondary) 622 data->groups[groups++] = secondary_is_max ? 623 &max16065_max_group : &max16065_min_group; 624 625 if (data->have_current) { 626 val = i2c_smbus_read_byte_data(client, MAX16065_CURR_CONTROL); 627 if (unlikely(val < 0)) 628 return val; 629 if (val & MAX16065_CURR_ENABLE) { 630 /* 631 * Current gain is 6, 12, 24, 48 based on values in 632 * bit 2,3. 633 */ 634 data->curr_gain = 6 << ((val >> 2) & 0x03); 635 data->range[MAX16065_NUM_ADC] 636 = max16065_csp_adc_range[(val >> 1) & 0x01]; 637 data->groups[groups++] = &max16065_current_group; 638 } else { 639 data->have_current = false; 640 } 641 } 642 643 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, 644 data, data->groups); 645 return PTR_ERR_OR_ZERO(hwmon_dev); 646 } 647 648 static const struct i2c_device_id max16065_id[] = { 649 { "max16065", max16065 }, 650 { "max16066", max16066 }, 651 { "max16067", max16067 }, 652 { "max16068", max16068 }, 653 { "max16070", max16070 }, 654 { "max16071", max16071 }, 655 { } 656 }; 657 658 MODULE_DEVICE_TABLE(i2c, max16065_id); 659 660 /* This is the driver that will be inserted */ 661 static struct i2c_driver max16065_driver = { 662 .driver = { 663 .name = "max16065", 664 }, 665 .probe = max16065_probe, 666 .id_table = max16065_id, 667 }; 668 669 module_i2c_driver(max16065_driver); 670 671 MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>"); 672 MODULE_DESCRIPTION("MAX16065 driver"); 673 MODULE_LICENSE("GPL"); 674