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/delay.h> 26#include <linux/jiffies.h> 27 28enum chips { max16065, max16066, max16067, max16068, max16070, max16071 }; 29 30/* 31 * Registers 32 */ 33#define MAX16065_ADC(x) ((x) * 2) 34 35#define MAX16065_CURR_SENSE 0x18 36#define MAX16065_CSP_ADC 0x19 37#define MAX16065_FAULT(x) (0x1b + (x)) 38#define MAX16065_SCALE(x) (0x43 + (x)) 39#define MAX16065_CURR_CONTROL 0x47 40#define MAX16065_LIMIT(l, x) (0x48 + (l) + (x) * 3) /* 41 * l: limit 42 * 0: min/max 43 * 1: crit 44 * 2: lcrit 45 * x: ADC index 46 */ 47 48#define MAX16065_SW_ENABLE 0x73 49 50#define MAX16065_WARNING_OV (1 << 3) /* Set if secondary threshold is OV 51 warning */ 52 53#define MAX16065_CURR_ENABLE (1 << 0) 54 55#define MAX16065_NUM_LIMIT 3 56#define MAX16065_NUM_ADC 12 /* maximum number of ADC channels */ 57 58static const int max16065_num_adc[] = { 59 [max16065] = 12, 60 [max16066] = 8, 61 [max16067] = 6, 62 [max16068] = 6, 63 [max16070] = 12, 64 [max16071] = 8, 65}; 66 67static const bool max16065_have_secondary[] = { 68 [max16065] = true, 69 [max16066] = true, 70 [max16067] = false, 71 [max16068] = false, 72 [max16070] = true, 73 [max16071] = true, 74}; 75 76static const bool max16065_have_current[] = { 77 [max16065] = true, 78 [max16066] = true, 79 [max16067] = false, 80 [max16068] = false, 81 [max16070] = true, 82 [max16071] = true, 83}; 84 85struct max16065_data { 86 enum chips type; 87 struct device *hwmon_dev; 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 102static const int max16065_adc_range[] = { 5560, 2780, 1390, 0 }; 103static const int max16065_csp_adc_range[] = { 7000, 14000 }; 104 105/* ADC registers have 10 bit resolution. */ 106static 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 */ 115static inline int LIMIT_TO_MV(int limit, int range) 116{ 117 return limit * range / 256; 118} 119 120static inline int MV_TO_LIMIT(int mv, int range) 121{ 122 return SENSORS_LIMIT(DIV_ROUND_CLOSEST(mv * 256, range), 0, 255); 123} 124 125static 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 */ 136static 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 146static struct max16065_data *max16065_update_device(struct device *dev) 147{ 148 struct i2c_client *client = to_i2c_client(dev); 149 struct max16065_data *data = i2c_get_clientdata(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 178static 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(to_i2c_client(dev), 191 MAX16065_FAULT(attr2->nr), val); 192 193 return snprintf(buf, PAGE_SIZE, "%d\n", !!val); 194} 195 196static 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 210static 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 222static 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 i2c_client *client = to_i2c_client(dev); 228 struct max16065_data *data = i2c_get_clientdata(client); 229 unsigned long val; 230 int err; 231 int limit; 232 233 err = kstrtoul(buf, 10, &val); 234 if (unlikely(err < 0)) 235 return err; 236 237 limit = MV_TO_LIMIT(val, data->range[attr2->index]); 238 239 mutex_lock(&data->update_lock); 240 data->limit[attr2->nr][attr2->index] 241 = LIMIT_TO_MV(limit, data->range[attr2->index]); 242 i2c_smbus_write_byte_data(client, 243 MAX16065_LIMIT(attr2->nr, attr2->index), 244 limit); 245 mutex_unlock(&data->update_lock); 246 247 return count; 248} 249 250static ssize_t max16065_show_limit(struct device *dev, 251 struct device_attribute *da, char *buf) 252{ 253 struct sensor_device_attribute_2 *attr2 = to_sensor_dev_attr_2(da); 254 struct i2c_client *client = to_i2c_client(dev); 255 struct max16065_data *data = i2c_get_clientdata(client); 256 257 return snprintf(buf, PAGE_SIZE, "%d\n", 258 data->limit[attr2->nr][attr2->index]); 259} 260 261/* Construct a sensor_device_attribute structure for each register */ 262 263/* Input voltages */ 264static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, max16065_show_input, NULL, 0); 265static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, max16065_show_input, NULL, 1); 266static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, max16065_show_input, NULL, 2); 267static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, max16065_show_input, NULL, 3); 268static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, max16065_show_input, NULL, 4); 269static SENSOR_DEVICE_ATTR(in5_input, S_IRUGO, max16065_show_input, NULL, 5); 270static SENSOR_DEVICE_ATTR(in6_input, S_IRUGO, max16065_show_input, NULL, 6); 271static SENSOR_DEVICE_ATTR(in7_input, S_IRUGO, max16065_show_input, NULL, 7); 272static SENSOR_DEVICE_ATTR(in8_input, S_IRUGO, max16065_show_input, NULL, 8); 273static SENSOR_DEVICE_ATTR(in9_input, S_IRUGO, max16065_show_input, NULL, 9); 274static SENSOR_DEVICE_ATTR(in10_input, S_IRUGO, max16065_show_input, NULL, 10); 275static SENSOR_DEVICE_ATTR(in11_input, S_IRUGO, max16065_show_input, NULL, 11); 276static SENSOR_DEVICE_ATTR(in12_input, S_IRUGO, max16065_show_input, NULL, 12); 277 278/* Input voltages lcrit */ 279static SENSOR_DEVICE_ATTR_2(in0_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit, 280 max16065_set_limit, 2, 0); 281static SENSOR_DEVICE_ATTR_2(in1_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit, 282 max16065_set_limit, 2, 1); 283static SENSOR_DEVICE_ATTR_2(in2_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit, 284 max16065_set_limit, 2, 2); 285static SENSOR_DEVICE_ATTR_2(in3_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit, 286 max16065_set_limit, 2, 3); 287static SENSOR_DEVICE_ATTR_2(in4_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit, 288 max16065_set_limit, 2, 4); 289static SENSOR_DEVICE_ATTR_2(in5_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit, 290 max16065_set_limit, 2, 5); 291static SENSOR_DEVICE_ATTR_2(in6_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit, 292 max16065_set_limit, 2, 6); 293static SENSOR_DEVICE_ATTR_2(in7_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit, 294 max16065_set_limit, 2, 7); 295static SENSOR_DEVICE_ATTR_2(in8_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit, 296 max16065_set_limit, 2, 8); 297static SENSOR_DEVICE_ATTR_2(in9_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit, 298 max16065_set_limit, 2, 9); 299static SENSOR_DEVICE_ATTR_2(in10_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit, 300 max16065_set_limit, 2, 10); 301static SENSOR_DEVICE_ATTR_2(in11_lcrit, S_IWUSR | S_IRUGO, max16065_show_limit, 302 max16065_set_limit, 2, 11); 303 304/* Input voltages crit */ 305static SENSOR_DEVICE_ATTR_2(in0_crit, S_IWUSR | S_IRUGO, max16065_show_limit, 306 max16065_set_limit, 1, 0); 307static SENSOR_DEVICE_ATTR_2(in1_crit, S_IWUSR | S_IRUGO, max16065_show_limit, 308 max16065_set_limit, 1, 1); 309static SENSOR_DEVICE_ATTR_2(in2_crit, S_IWUSR | S_IRUGO, max16065_show_limit, 310 max16065_set_limit, 1, 2); 311static SENSOR_DEVICE_ATTR_2(in3_crit, S_IWUSR | S_IRUGO, max16065_show_limit, 312 max16065_set_limit, 1, 3); 313static SENSOR_DEVICE_ATTR_2(in4_crit, S_IWUSR | S_IRUGO, max16065_show_limit, 314 max16065_set_limit, 1, 4); 315static SENSOR_DEVICE_ATTR_2(in5_crit, S_IWUSR | S_IRUGO, max16065_show_limit, 316 max16065_set_limit, 1, 5); 317static SENSOR_DEVICE_ATTR_2(in6_crit, S_IWUSR | S_IRUGO, max16065_show_limit, 318 max16065_set_limit, 1, 6); 319static SENSOR_DEVICE_ATTR_2(in7_crit, S_IWUSR | S_IRUGO, max16065_show_limit, 320 max16065_set_limit, 1, 7); 321static SENSOR_DEVICE_ATTR_2(in8_crit, S_IWUSR | S_IRUGO, max16065_show_limit, 322 max16065_set_limit, 1, 8); 323static SENSOR_DEVICE_ATTR_2(in9_crit, S_IWUSR | S_IRUGO, max16065_show_limit, 324 max16065_set_limit, 1, 9); 325static SENSOR_DEVICE_ATTR_2(in10_crit, S_IWUSR | S_IRUGO, max16065_show_limit, 326 max16065_set_limit, 1, 10); 327static SENSOR_DEVICE_ATTR_2(in11_crit, S_IWUSR | S_IRUGO, max16065_show_limit, 328 max16065_set_limit, 1, 11); 329 330/* Input voltages min */ 331static SENSOR_DEVICE_ATTR_2(in0_min, S_IWUSR | S_IRUGO, max16065_show_limit, 332 max16065_set_limit, 0, 0); 333static SENSOR_DEVICE_ATTR_2(in1_min, S_IWUSR | S_IRUGO, max16065_show_limit, 334 max16065_set_limit, 0, 1); 335static SENSOR_DEVICE_ATTR_2(in2_min, S_IWUSR | S_IRUGO, max16065_show_limit, 336 max16065_set_limit, 0, 2); 337static SENSOR_DEVICE_ATTR_2(in3_min, S_IWUSR | S_IRUGO, max16065_show_limit, 338 max16065_set_limit, 0, 3); 339static SENSOR_DEVICE_ATTR_2(in4_min, S_IWUSR | S_IRUGO, max16065_show_limit, 340 max16065_set_limit, 0, 4); 341static SENSOR_DEVICE_ATTR_2(in5_min, S_IWUSR | S_IRUGO, max16065_show_limit, 342 max16065_set_limit, 0, 5); 343static SENSOR_DEVICE_ATTR_2(in6_min, S_IWUSR | S_IRUGO, max16065_show_limit, 344 max16065_set_limit, 0, 6); 345static SENSOR_DEVICE_ATTR_2(in7_min, S_IWUSR | S_IRUGO, max16065_show_limit, 346 max16065_set_limit, 0, 7); 347static SENSOR_DEVICE_ATTR_2(in8_min, S_IWUSR | S_IRUGO, max16065_show_limit, 348 max16065_set_limit, 0, 8); 349static SENSOR_DEVICE_ATTR_2(in9_min, S_IWUSR | S_IRUGO, max16065_show_limit, 350 max16065_set_limit, 0, 9); 351static SENSOR_DEVICE_ATTR_2(in10_min, S_IWUSR | S_IRUGO, max16065_show_limit, 352 max16065_set_limit, 0, 10); 353static SENSOR_DEVICE_ATTR_2(in11_min, S_IWUSR | S_IRUGO, max16065_show_limit, 354 max16065_set_limit, 0, 11); 355 356/* Input voltages max */ 357static SENSOR_DEVICE_ATTR_2(in0_max, S_IWUSR | S_IRUGO, max16065_show_limit, 358 max16065_set_limit, 0, 0); 359static SENSOR_DEVICE_ATTR_2(in1_max, S_IWUSR | S_IRUGO, max16065_show_limit, 360 max16065_set_limit, 0, 1); 361static SENSOR_DEVICE_ATTR_2(in2_max, S_IWUSR | S_IRUGO, max16065_show_limit, 362 max16065_set_limit, 0, 2); 363static SENSOR_DEVICE_ATTR_2(in3_max, S_IWUSR | S_IRUGO, max16065_show_limit, 364 max16065_set_limit, 0, 3); 365static SENSOR_DEVICE_ATTR_2(in4_max, S_IWUSR | S_IRUGO, max16065_show_limit, 366 max16065_set_limit, 0, 4); 367static SENSOR_DEVICE_ATTR_2(in5_max, S_IWUSR | S_IRUGO, max16065_show_limit, 368 max16065_set_limit, 0, 5); 369static SENSOR_DEVICE_ATTR_2(in6_max, S_IWUSR | S_IRUGO, max16065_show_limit, 370 max16065_set_limit, 0, 6); 371static SENSOR_DEVICE_ATTR_2(in7_max, S_IWUSR | S_IRUGO, max16065_show_limit, 372 max16065_set_limit, 0, 7); 373static SENSOR_DEVICE_ATTR_2(in8_max, S_IWUSR | S_IRUGO, max16065_show_limit, 374 max16065_set_limit, 0, 8); 375static SENSOR_DEVICE_ATTR_2(in9_max, S_IWUSR | S_IRUGO, max16065_show_limit, 376 max16065_set_limit, 0, 9); 377static SENSOR_DEVICE_ATTR_2(in10_max, S_IWUSR | S_IRUGO, max16065_show_limit, 378 max16065_set_limit, 0, 10); 379static SENSOR_DEVICE_ATTR_2(in11_max, S_IWUSR | S_IRUGO, max16065_show_limit, 380 max16065_set_limit, 0, 11); 381 382/* alarms */ 383static SENSOR_DEVICE_ATTR_2(in0_alarm, S_IRUGO, max16065_show_alarm, NULL, 384 0, 0); 385static SENSOR_DEVICE_ATTR_2(in1_alarm, S_IRUGO, max16065_show_alarm, NULL, 386 0, 1); 387static SENSOR_DEVICE_ATTR_2(in2_alarm, S_IRUGO, max16065_show_alarm, NULL, 388 0, 2); 389static SENSOR_DEVICE_ATTR_2(in3_alarm, S_IRUGO, max16065_show_alarm, NULL, 390 0, 3); 391static SENSOR_DEVICE_ATTR_2(in4_alarm, S_IRUGO, max16065_show_alarm, NULL, 392 0, 4); 393static SENSOR_DEVICE_ATTR_2(in5_alarm, S_IRUGO, max16065_show_alarm, NULL, 394 0, 5); 395static SENSOR_DEVICE_ATTR_2(in6_alarm, S_IRUGO, max16065_show_alarm, NULL, 396 0, 6); 397static SENSOR_DEVICE_ATTR_2(in7_alarm, S_IRUGO, max16065_show_alarm, NULL, 398 0, 7); 399static SENSOR_DEVICE_ATTR_2(in8_alarm, S_IRUGO, max16065_show_alarm, NULL, 400 1, 0); 401static SENSOR_DEVICE_ATTR_2(in9_alarm, S_IRUGO, max16065_show_alarm, NULL, 402 1, 1); 403static SENSOR_DEVICE_ATTR_2(in10_alarm, S_IRUGO, max16065_show_alarm, NULL, 404 1, 2); 405static SENSOR_DEVICE_ATTR_2(in11_alarm, S_IRUGO, max16065_show_alarm, NULL, 406 1, 3); 407 408/* Current and alarm */ 409static SENSOR_DEVICE_ATTR(curr1_input, S_IRUGO, max16065_show_current, NULL, 0); 410static SENSOR_DEVICE_ATTR_2(curr1_alarm, S_IRUGO, max16065_show_alarm, NULL, 411 1, 4); 412 413/* 414 * Finally, construct an array of pointers to members of the above objects, 415 * as required for sysfs_create_group() 416 */ 417static struct attribute *max16065_basic_attributes[] = { 418 &sensor_dev_attr_in0_input.dev_attr.attr, 419 &sensor_dev_attr_in0_lcrit.dev_attr.attr, 420 &sensor_dev_attr_in0_crit.dev_attr.attr, 421 &sensor_dev_attr_in0_alarm.dev_attr.attr, 422 423 &sensor_dev_attr_in1_input.dev_attr.attr, 424 &sensor_dev_attr_in1_lcrit.dev_attr.attr, 425 &sensor_dev_attr_in1_crit.dev_attr.attr, 426 &sensor_dev_attr_in1_alarm.dev_attr.attr, 427 428 &sensor_dev_attr_in2_input.dev_attr.attr, 429 &sensor_dev_attr_in2_lcrit.dev_attr.attr, 430 &sensor_dev_attr_in2_crit.dev_attr.attr, 431 &sensor_dev_attr_in2_alarm.dev_attr.attr, 432 433 &sensor_dev_attr_in3_input.dev_attr.attr, 434 &sensor_dev_attr_in3_lcrit.dev_attr.attr, 435 &sensor_dev_attr_in3_crit.dev_attr.attr, 436 &sensor_dev_attr_in3_alarm.dev_attr.attr, 437 438 &sensor_dev_attr_in4_input.dev_attr.attr, 439 &sensor_dev_attr_in4_lcrit.dev_attr.attr, 440 &sensor_dev_attr_in4_crit.dev_attr.attr, 441 &sensor_dev_attr_in4_alarm.dev_attr.attr, 442 443 &sensor_dev_attr_in5_input.dev_attr.attr, 444 &sensor_dev_attr_in5_lcrit.dev_attr.attr, 445 &sensor_dev_attr_in5_crit.dev_attr.attr, 446 &sensor_dev_attr_in5_alarm.dev_attr.attr, 447 448 &sensor_dev_attr_in6_input.dev_attr.attr, 449 &sensor_dev_attr_in6_lcrit.dev_attr.attr, 450 &sensor_dev_attr_in6_crit.dev_attr.attr, 451 &sensor_dev_attr_in6_alarm.dev_attr.attr, 452 453 &sensor_dev_attr_in7_input.dev_attr.attr, 454 &sensor_dev_attr_in7_lcrit.dev_attr.attr, 455 &sensor_dev_attr_in7_crit.dev_attr.attr, 456 &sensor_dev_attr_in7_alarm.dev_attr.attr, 457 458 &sensor_dev_attr_in8_input.dev_attr.attr, 459 &sensor_dev_attr_in8_lcrit.dev_attr.attr, 460 &sensor_dev_attr_in8_crit.dev_attr.attr, 461 &sensor_dev_attr_in8_alarm.dev_attr.attr, 462 463 &sensor_dev_attr_in9_input.dev_attr.attr, 464 &sensor_dev_attr_in9_lcrit.dev_attr.attr, 465 &sensor_dev_attr_in9_crit.dev_attr.attr, 466 &sensor_dev_attr_in9_alarm.dev_attr.attr, 467 468 &sensor_dev_attr_in10_input.dev_attr.attr, 469 &sensor_dev_attr_in10_lcrit.dev_attr.attr, 470 &sensor_dev_attr_in10_crit.dev_attr.attr, 471 &sensor_dev_attr_in10_alarm.dev_attr.attr, 472 473 &sensor_dev_attr_in11_input.dev_attr.attr, 474 &sensor_dev_attr_in11_lcrit.dev_attr.attr, 475 &sensor_dev_attr_in11_crit.dev_attr.attr, 476 &sensor_dev_attr_in11_alarm.dev_attr.attr, 477 478 NULL 479}; 480 481static struct attribute *max16065_current_attributes[] = { 482 &sensor_dev_attr_in12_input.dev_attr.attr, 483 &sensor_dev_attr_curr1_input.dev_attr.attr, 484 &sensor_dev_attr_curr1_alarm.dev_attr.attr, 485 NULL 486}; 487 488static struct attribute *max16065_min_attributes[] = { 489 &sensor_dev_attr_in0_min.dev_attr.attr, 490 &sensor_dev_attr_in1_min.dev_attr.attr, 491 &sensor_dev_attr_in2_min.dev_attr.attr, 492 &sensor_dev_attr_in3_min.dev_attr.attr, 493 &sensor_dev_attr_in4_min.dev_attr.attr, 494 &sensor_dev_attr_in5_min.dev_attr.attr, 495 &sensor_dev_attr_in6_min.dev_attr.attr, 496 &sensor_dev_attr_in7_min.dev_attr.attr, 497 &sensor_dev_attr_in8_min.dev_attr.attr, 498 &sensor_dev_attr_in9_min.dev_attr.attr, 499 &sensor_dev_attr_in10_min.dev_attr.attr, 500 &sensor_dev_attr_in11_min.dev_attr.attr, 501 NULL 502}; 503 504static struct attribute *max16065_max_attributes[] = { 505 &sensor_dev_attr_in0_max.dev_attr.attr, 506 &sensor_dev_attr_in1_max.dev_attr.attr, 507 &sensor_dev_attr_in2_max.dev_attr.attr, 508 &sensor_dev_attr_in3_max.dev_attr.attr, 509 &sensor_dev_attr_in4_max.dev_attr.attr, 510 &sensor_dev_attr_in5_max.dev_attr.attr, 511 &sensor_dev_attr_in6_max.dev_attr.attr, 512 &sensor_dev_attr_in7_max.dev_attr.attr, 513 &sensor_dev_attr_in8_max.dev_attr.attr, 514 &sensor_dev_attr_in9_max.dev_attr.attr, 515 &sensor_dev_attr_in10_max.dev_attr.attr, 516 &sensor_dev_attr_in11_max.dev_attr.attr, 517 NULL 518}; 519 520static const struct attribute_group max16065_basic_group = { 521 .attrs = max16065_basic_attributes, 522}; 523 524static const struct attribute_group max16065_current_group = { 525 .attrs = max16065_current_attributes, 526}; 527 528static const struct attribute_group max16065_min_group = { 529 .attrs = max16065_min_attributes, 530}; 531 532static const struct attribute_group max16065_max_group = { 533 .attrs = max16065_max_attributes, 534}; 535 536static void max16065_cleanup(struct i2c_client *client) 537{ 538 sysfs_remove_group(&client->dev.kobj, &max16065_max_group); 539 sysfs_remove_group(&client->dev.kobj, &max16065_min_group); 540 sysfs_remove_group(&client->dev.kobj, &max16065_current_group); 541 sysfs_remove_group(&client->dev.kobj, &max16065_basic_group); 542} 543 544static int max16065_probe(struct i2c_client *client, 545 const struct i2c_device_id *id) 546{ 547 struct i2c_adapter *adapter = client->adapter; 548 struct max16065_data *data; 549 int i, j, val, ret; 550 bool have_secondary; /* true if chip has secondary limits */ 551 bool secondary_is_max = false; /* secondary limits reflect max */ 552 553 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA 554 | I2C_FUNC_SMBUS_READ_WORD_DATA)) 555 return -ENODEV; 556 557 data = devm_kzalloc(&client->dev, sizeof(*data), GFP_KERNEL); 558 if (unlikely(!data)) 559 return -ENOMEM; 560 561 i2c_set_clientdata(client, data); 562 mutex_init(&data->update_lock); 563 564 data->num_adc = max16065_num_adc[id->driver_data]; 565 data->have_current = max16065_have_current[id->driver_data]; 566 have_secondary = max16065_have_secondary[id->driver_data]; 567 568 if (have_secondary) { 569 val = i2c_smbus_read_byte_data(client, MAX16065_SW_ENABLE); 570 if (unlikely(val < 0)) 571 return val; 572 secondary_is_max = val & MAX16065_WARNING_OV; 573 } 574 575 /* Read scale registers, convert to range */ 576 for (i = 0; i < DIV_ROUND_UP(data->num_adc, 4); i++) { 577 val = i2c_smbus_read_byte_data(client, MAX16065_SCALE(i)); 578 if (unlikely(val < 0)) 579 return val; 580 for (j = 0; j < 4 && i * 4 + j < data->num_adc; j++) { 581 data->range[i * 4 + j] = 582 max16065_adc_range[(val >> (j * 2)) & 0x3]; 583 } 584 } 585 586 /* Read limits */ 587 for (i = 0; i < MAX16065_NUM_LIMIT; i++) { 588 if (i == 0 && !have_secondary) 589 continue; 590 591 for (j = 0; j < data->num_adc; j++) { 592 val = i2c_smbus_read_byte_data(client, 593 MAX16065_LIMIT(i, j)); 594 if (unlikely(val < 0)) 595 return val; 596 data->limit[i][j] = LIMIT_TO_MV(val, data->range[j]); 597 } 598 } 599 600 /* Register sysfs hooks */ 601 for (i = 0; i < data->num_adc * 4; i++) { 602 /* Do not create sysfs entry if channel is disabled */ 603 if (!data->range[i / 4]) 604 continue; 605 606 ret = sysfs_create_file(&client->dev.kobj, 607 max16065_basic_attributes[i]); 608 if (unlikely(ret)) 609 goto out; 610 } 611 612 if (have_secondary) { 613 struct attribute **attr = secondary_is_max ? 614 max16065_max_attributes : max16065_min_attributes; 615 616 for (i = 0; i < data->num_adc; i++) { 617 if (!data->range[i]) 618 continue; 619 620 ret = sysfs_create_file(&client->dev.kobj, attr[i]); 621 if (unlikely(ret)) 622 goto out; 623 } 624 } 625 626 if (data->have_current) { 627 val = i2c_smbus_read_byte_data(client, MAX16065_CURR_CONTROL); 628 if (unlikely(val < 0)) { 629 ret = val; 630 goto out; 631 } 632 if (val & MAX16065_CURR_ENABLE) { 633 /* 634 * Current gain is 6, 12, 24, 48 based on values in 635 * bit 2,3. 636 */ 637 data->curr_gain = 6 << ((val >> 2) & 0x03); 638 data->range[MAX16065_NUM_ADC] 639 = max16065_csp_adc_range[(val >> 1) & 0x01]; 640 ret = sysfs_create_group(&client->dev.kobj, 641 &max16065_current_group); 642 if (unlikely(ret)) 643 goto out; 644 } else { 645 data->have_current = false; 646 } 647 } 648 649 data->hwmon_dev = hwmon_device_register(&client->dev); 650 if (unlikely(IS_ERR(data->hwmon_dev))) { 651 ret = PTR_ERR(data->hwmon_dev); 652 goto out; 653 } 654 return 0; 655 656out: 657 max16065_cleanup(client); 658 return ret; 659} 660 661static int max16065_remove(struct i2c_client *client) 662{ 663 struct max16065_data *data = i2c_get_clientdata(client); 664 665 hwmon_device_unregister(data->hwmon_dev); 666 max16065_cleanup(client); 667 668 return 0; 669} 670 671static const struct i2c_device_id max16065_id[] = { 672 { "max16065", max16065 }, 673 { "max16066", max16066 }, 674 { "max16067", max16067 }, 675 { "max16068", max16068 }, 676 { "max16070", max16070 }, 677 { "max16071", max16071 }, 678 { } 679}; 680 681MODULE_DEVICE_TABLE(i2c, max16065_id); 682 683/* This is the driver that will be inserted */ 684static struct i2c_driver max16065_driver = { 685 .driver = { 686 .name = "max16065", 687 }, 688 .probe = max16065_probe, 689 .remove = max16065_remove, 690 .id_table = max16065_id, 691}; 692 693module_i2c_driver(max16065_driver); 694 695MODULE_AUTHOR("Guenter Roeck <guenter.roeck@ericsson.com>"); 696MODULE_DESCRIPTION("MAX16065 driver"); 697MODULE_LICENSE("GPL"); 698