1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * smsc47m192.c - Support for hardware monitoring block of 4 * SMSC LPC47M192 and compatible Super I/O chips 5 * 6 * Copyright (C) 2006 Hartmut Rick <linux@rick.claranet.de> 7 * 8 * Derived from lm78.c and other chip drivers. 9 */ 10 11 #include <linux/module.h> 12 #include <linux/init.h> 13 #include <linux/slab.h> 14 #include <linux/jiffies.h> 15 #include <linux/i2c.h> 16 #include <linux/hwmon.h> 17 #include <linux/hwmon-sysfs.h> 18 #include <linux/hwmon-vid.h> 19 #include <linux/err.h> 20 #include <linux/sysfs.h> 21 #include <linux/mutex.h> 22 23 /* Addresses to scan */ 24 static const unsigned short normal_i2c[] = { 0x2c, 0x2d, I2C_CLIENT_END }; 25 26 /* SMSC47M192 registers */ 27 #define SMSC47M192_REG_IN(nr) ((nr) < 6 ? (0x20 + (nr)) : \ 28 (0x50 + (nr) - 6)) 29 #define SMSC47M192_REG_IN_MAX(nr) ((nr) < 6 ? (0x2b + (nr) * 2) : \ 30 (0x54 + (((nr) - 6) * 2))) 31 #define SMSC47M192_REG_IN_MIN(nr) ((nr) < 6 ? (0x2c + (nr) * 2) : \ 32 (0x55 + (((nr) - 6) * 2))) 33 static u8 SMSC47M192_REG_TEMP[3] = { 0x27, 0x26, 0x52 }; 34 static u8 SMSC47M192_REG_TEMP_MAX[3] = { 0x39, 0x37, 0x58 }; 35 static u8 SMSC47M192_REG_TEMP_MIN[3] = { 0x3A, 0x38, 0x59 }; 36 #define SMSC47M192_REG_TEMP_OFFSET(nr) ((nr) == 2 ? 0x1e : 0x1f) 37 #define SMSC47M192_REG_ALARM1 0x41 38 #define SMSC47M192_REG_ALARM2 0x42 39 #define SMSC47M192_REG_VID 0x47 40 #define SMSC47M192_REG_VID4 0x49 41 #define SMSC47M192_REG_CONFIG 0x40 42 #define SMSC47M192_REG_SFR 0x4f 43 #define SMSC47M192_REG_COMPANY_ID 0x3e 44 #define SMSC47M192_REG_VERSION 0x3f 45 46 /* generalised scaling with integer rounding */ 47 static inline int SCALE(long val, int mul, int div) 48 { 49 if (val < 0) 50 return (val * mul - div / 2) / div; 51 else 52 return (val * mul + div / 2) / div; 53 } 54 55 /* Conversions */ 56 57 /* smsc47m192 internally scales voltage measurements */ 58 static const u16 nom_mv[] = { 2500, 2250, 3300, 5000, 12000, 3300, 1500, 1800 }; 59 60 static inline unsigned int IN_FROM_REG(u8 reg, int n) 61 { 62 return SCALE(reg, nom_mv[n], 192); 63 } 64 65 static inline u8 IN_TO_REG(unsigned long val, int n) 66 { 67 val = clamp_val(val, 0, nom_mv[n] * 255 / 192); 68 return SCALE(val, 192, nom_mv[n]); 69 } 70 71 /* 72 * TEMP: 0.001 degC units (-128C to +127C) 73 * REG: 1C/bit, two's complement 74 */ 75 static inline s8 TEMP_TO_REG(long val) 76 { 77 return SCALE(clamp_val(val, -128000, 127000), 1, 1000); 78 } 79 80 static inline int TEMP_FROM_REG(s8 val) 81 { 82 return val * 1000; 83 } 84 85 struct smsc47m192_data { 86 struct i2c_client *client; 87 const struct attribute_group *groups[3]; 88 struct mutex update_lock; 89 bool valid; /* true if following fields are valid */ 90 unsigned long last_updated; /* In jiffies */ 91 92 u8 in[8]; /* Register value */ 93 u8 in_max[8]; /* Register value */ 94 u8 in_min[8]; /* Register value */ 95 s8 temp[3]; /* Register value */ 96 s8 temp_max[3]; /* Register value */ 97 s8 temp_min[3]; /* Register value */ 98 s8 temp_offset[3]; /* Register value */ 99 u16 alarms; /* Register encoding, combined */ 100 u8 vid; /* Register encoding, combined */ 101 u8 vrm; 102 }; 103 104 static struct smsc47m192_data *smsc47m192_update_device(struct device *dev) 105 { 106 struct smsc47m192_data *data = dev_get_drvdata(dev); 107 struct i2c_client *client = data->client; 108 int i, config; 109 110 mutex_lock(&data->update_lock); 111 112 if (time_after(jiffies, data->last_updated + HZ + HZ / 2) 113 || !data->valid) { 114 u8 sfr = i2c_smbus_read_byte_data(client, SMSC47M192_REG_SFR); 115 116 dev_dbg(&client->dev, "Starting smsc47m192 update\n"); 117 118 for (i = 0; i <= 7; i++) { 119 data->in[i] = i2c_smbus_read_byte_data(client, 120 SMSC47M192_REG_IN(i)); 121 data->in_min[i] = i2c_smbus_read_byte_data(client, 122 SMSC47M192_REG_IN_MIN(i)); 123 data->in_max[i] = i2c_smbus_read_byte_data(client, 124 SMSC47M192_REG_IN_MAX(i)); 125 } 126 for (i = 0; i < 3; i++) { 127 data->temp[i] = i2c_smbus_read_byte_data(client, 128 SMSC47M192_REG_TEMP[i]); 129 data->temp_max[i] = i2c_smbus_read_byte_data(client, 130 SMSC47M192_REG_TEMP_MAX[i]); 131 data->temp_min[i] = i2c_smbus_read_byte_data(client, 132 SMSC47M192_REG_TEMP_MIN[i]); 133 } 134 for (i = 1; i < 3; i++) 135 data->temp_offset[i] = i2c_smbus_read_byte_data(client, 136 SMSC47M192_REG_TEMP_OFFSET(i)); 137 /* 138 * first offset is temp_offset[0] if SFR bit 4 is set, 139 * temp_offset[1] otherwise 140 */ 141 if (sfr & 0x10) { 142 data->temp_offset[0] = data->temp_offset[1]; 143 data->temp_offset[1] = 0; 144 } else 145 data->temp_offset[0] = 0; 146 147 data->vid = i2c_smbus_read_byte_data(client, SMSC47M192_REG_VID) 148 & 0x0f; 149 config = i2c_smbus_read_byte_data(client, 150 SMSC47M192_REG_CONFIG); 151 if (config & 0x20) 152 data->vid |= (i2c_smbus_read_byte_data(client, 153 SMSC47M192_REG_VID4) & 0x01) << 4; 154 data->alarms = i2c_smbus_read_byte_data(client, 155 SMSC47M192_REG_ALARM1) | 156 (i2c_smbus_read_byte_data(client, 157 SMSC47M192_REG_ALARM2) << 8); 158 159 data->last_updated = jiffies; 160 data->valid = true; 161 } 162 163 mutex_unlock(&data->update_lock); 164 165 return data; 166 } 167 168 /* Voltages */ 169 static ssize_t in_show(struct device *dev, struct device_attribute *attr, 170 char *buf) 171 { 172 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); 173 int nr = sensor_attr->index; 174 struct smsc47m192_data *data = smsc47m192_update_device(dev); 175 return sprintf(buf, "%d\n", IN_FROM_REG(data->in[nr], nr)); 176 } 177 178 static ssize_t in_min_show(struct device *dev, struct device_attribute *attr, 179 char *buf) 180 { 181 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); 182 int nr = sensor_attr->index; 183 struct smsc47m192_data *data = smsc47m192_update_device(dev); 184 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[nr], nr)); 185 } 186 187 static ssize_t in_max_show(struct device *dev, struct device_attribute *attr, 188 char *buf) 189 { 190 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); 191 int nr = sensor_attr->index; 192 struct smsc47m192_data *data = smsc47m192_update_device(dev); 193 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[nr], nr)); 194 } 195 196 static ssize_t in_min_store(struct device *dev, struct device_attribute *attr, 197 const char *buf, size_t count) 198 { 199 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); 200 int nr = sensor_attr->index; 201 struct smsc47m192_data *data = dev_get_drvdata(dev); 202 struct i2c_client *client = data->client; 203 unsigned long val; 204 int err; 205 206 err = kstrtoul(buf, 10, &val); 207 if (err) 208 return err; 209 210 mutex_lock(&data->update_lock); 211 data->in_min[nr] = IN_TO_REG(val, nr); 212 i2c_smbus_write_byte_data(client, SMSC47M192_REG_IN_MIN(nr), 213 data->in_min[nr]); 214 mutex_unlock(&data->update_lock); 215 return count; 216 } 217 218 static ssize_t in_max_store(struct device *dev, struct device_attribute *attr, 219 const char *buf, size_t count) 220 { 221 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); 222 int nr = sensor_attr->index; 223 struct smsc47m192_data *data = dev_get_drvdata(dev); 224 struct i2c_client *client = data->client; 225 unsigned long val; 226 int err; 227 228 err = kstrtoul(buf, 10, &val); 229 if (err) 230 return err; 231 232 mutex_lock(&data->update_lock); 233 data->in_max[nr] = IN_TO_REG(val, nr); 234 i2c_smbus_write_byte_data(client, SMSC47M192_REG_IN_MAX(nr), 235 data->in_max[nr]); 236 mutex_unlock(&data->update_lock); 237 return count; 238 } 239 240 static SENSOR_DEVICE_ATTR_RO(in0_input, in, 0); 241 static SENSOR_DEVICE_ATTR_RW(in0_min, in_min, 0); 242 static SENSOR_DEVICE_ATTR_RW(in0_max, in_max, 0); 243 static SENSOR_DEVICE_ATTR_RO(in1_input, in, 1); 244 static SENSOR_DEVICE_ATTR_RW(in1_min, in_min, 1); 245 static SENSOR_DEVICE_ATTR_RW(in1_max, in_max, 1); 246 static SENSOR_DEVICE_ATTR_RO(in2_input, in, 2); 247 static SENSOR_DEVICE_ATTR_RW(in2_min, in_min, 2); 248 static SENSOR_DEVICE_ATTR_RW(in2_max, in_max, 2); 249 static SENSOR_DEVICE_ATTR_RO(in3_input, in, 3); 250 static SENSOR_DEVICE_ATTR_RW(in3_min, in_min, 3); 251 static SENSOR_DEVICE_ATTR_RW(in3_max, in_max, 3); 252 static SENSOR_DEVICE_ATTR_RO(in4_input, in, 4); 253 static SENSOR_DEVICE_ATTR_RW(in4_min, in_min, 4); 254 static SENSOR_DEVICE_ATTR_RW(in4_max, in_max, 4); 255 static SENSOR_DEVICE_ATTR_RO(in5_input, in, 5); 256 static SENSOR_DEVICE_ATTR_RW(in5_min, in_min, 5); 257 static SENSOR_DEVICE_ATTR_RW(in5_max, in_max, 5); 258 static SENSOR_DEVICE_ATTR_RO(in6_input, in, 6); 259 static SENSOR_DEVICE_ATTR_RW(in6_min, in_min, 6); 260 static SENSOR_DEVICE_ATTR_RW(in6_max, in_max, 6); 261 static SENSOR_DEVICE_ATTR_RO(in7_input, in, 7); 262 static SENSOR_DEVICE_ATTR_RW(in7_min, in_min, 7); 263 static SENSOR_DEVICE_ATTR_RW(in7_max, in_max, 7); 264 265 /* Temperatures */ 266 static ssize_t temp_show(struct device *dev, struct device_attribute *attr, 267 char *buf) 268 { 269 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); 270 int nr = sensor_attr->index; 271 struct smsc47m192_data *data = smsc47m192_update_device(dev); 272 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr])); 273 } 274 275 static ssize_t temp_min_show(struct device *dev, 276 struct device_attribute *attr, char *buf) 277 { 278 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); 279 int nr = sensor_attr->index; 280 struct smsc47m192_data *data = smsc47m192_update_device(dev); 281 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_min[nr])); 282 } 283 284 static ssize_t temp_max_show(struct device *dev, 285 struct device_attribute *attr, char *buf) 286 { 287 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); 288 int nr = sensor_attr->index; 289 struct smsc47m192_data *data = smsc47m192_update_device(dev); 290 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_max[nr])); 291 } 292 293 static ssize_t temp_min_store(struct device *dev, 294 struct device_attribute *attr, const char *buf, 295 size_t count) 296 { 297 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); 298 int nr = sensor_attr->index; 299 struct smsc47m192_data *data = dev_get_drvdata(dev); 300 struct i2c_client *client = data->client; 301 long val; 302 int err; 303 304 err = kstrtol(buf, 10, &val); 305 if (err) 306 return err; 307 308 mutex_lock(&data->update_lock); 309 data->temp_min[nr] = TEMP_TO_REG(val); 310 i2c_smbus_write_byte_data(client, SMSC47M192_REG_TEMP_MIN[nr], 311 data->temp_min[nr]); 312 mutex_unlock(&data->update_lock); 313 return count; 314 } 315 316 static ssize_t temp_max_store(struct device *dev, 317 struct device_attribute *attr, const char *buf, 318 size_t count) 319 { 320 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); 321 int nr = sensor_attr->index; 322 struct smsc47m192_data *data = dev_get_drvdata(dev); 323 struct i2c_client *client = data->client; 324 long val; 325 int err; 326 327 err = kstrtol(buf, 10, &val); 328 if (err) 329 return err; 330 331 mutex_lock(&data->update_lock); 332 data->temp_max[nr] = TEMP_TO_REG(val); 333 i2c_smbus_write_byte_data(client, SMSC47M192_REG_TEMP_MAX[nr], 334 data->temp_max[nr]); 335 mutex_unlock(&data->update_lock); 336 return count; 337 } 338 339 static ssize_t temp_offset_show(struct device *dev, 340 struct device_attribute *attr, char *buf) 341 { 342 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); 343 int nr = sensor_attr->index; 344 struct smsc47m192_data *data = smsc47m192_update_device(dev); 345 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_offset[nr])); 346 } 347 348 static ssize_t temp_offset_store(struct device *dev, 349 struct device_attribute *attr, 350 const char *buf, size_t count) 351 { 352 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); 353 int nr = sensor_attr->index; 354 struct smsc47m192_data *data = dev_get_drvdata(dev); 355 struct i2c_client *client = data->client; 356 u8 sfr = i2c_smbus_read_byte_data(client, SMSC47M192_REG_SFR); 357 long val; 358 int err; 359 360 err = kstrtol(buf, 10, &val); 361 if (err) 362 return err; 363 364 mutex_lock(&data->update_lock); 365 data->temp_offset[nr] = TEMP_TO_REG(val); 366 if (nr > 1) 367 i2c_smbus_write_byte_data(client, 368 SMSC47M192_REG_TEMP_OFFSET(nr), data->temp_offset[nr]); 369 else if (data->temp_offset[nr] != 0) { 370 /* 371 * offset[0] and offset[1] share the same register, 372 * SFR bit 4 activates offset[0] 373 */ 374 i2c_smbus_write_byte_data(client, SMSC47M192_REG_SFR, 375 (sfr & 0xef) | (nr == 0 ? 0x10 : 0)); 376 data->temp_offset[1-nr] = 0; 377 i2c_smbus_write_byte_data(client, 378 SMSC47M192_REG_TEMP_OFFSET(nr), data->temp_offset[nr]); 379 } else if ((sfr & 0x10) == (nr == 0 ? 0x10 : 0)) 380 i2c_smbus_write_byte_data(client, 381 SMSC47M192_REG_TEMP_OFFSET(nr), 0); 382 mutex_unlock(&data->update_lock); 383 return count; 384 } 385 386 static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, 0); 387 static SENSOR_DEVICE_ATTR_RW(temp1_min, temp_min, 0); 388 static SENSOR_DEVICE_ATTR_RW(temp1_max, temp_max, 0); 389 static SENSOR_DEVICE_ATTR_RW(temp1_offset, temp_offset, 0); 390 static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, 1); 391 static SENSOR_DEVICE_ATTR_RW(temp2_min, temp_min, 1); 392 static SENSOR_DEVICE_ATTR_RW(temp2_max, temp_max, 1); 393 static SENSOR_DEVICE_ATTR_RW(temp2_offset, temp_offset, 1); 394 static SENSOR_DEVICE_ATTR_RO(temp3_input, temp, 2); 395 static SENSOR_DEVICE_ATTR_RW(temp3_min, temp_min, 2); 396 static SENSOR_DEVICE_ATTR_RW(temp3_max, temp_max, 2); 397 static SENSOR_DEVICE_ATTR_RW(temp3_offset, temp_offset, 2); 398 399 /* VID */ 400 static ssize_t cpu0_vid_show(struct device *dev, 401 struct device_attribute *attr, char *buf) 402 { 403 struct smsc47m192_data *data = smsc47m192_update_device(dev); 404 return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm)); 405 } 406 static DEVICE_ATTR_RO(cpu0_vid); 407 408 static ssize_t vrm_show(struct device *dev, struct device_attribute *attr, 409 char *buf) 410 { 411 struct smsc47m192_data *data = dev_get_drvdata(dev); 412 return sprintf(buf, "%d\n", data->vrm); 413 } 414 415 static ssize_t vrm_store(struct device *dev, struct device_attribute *attr, 416 const char *buf, size_t count) 417 { 418 struct smsc47m192_data *data = dev_get_drvdata(dev); 419 unsigned long val; 420 int err; 421 422 err = kstrtoul(buf, 10, &val); 423 if (err) 424 return err; 425 if (val > 255) 426 return -EINVAL; 427 428 data->vrm = val; 429 return count; 430 } 431 static DEVICE_ATTR_RW(vrm); 432 433 /* Alarms */ 434 static ssize_t alarm_show(struct device *dev, struct device_attribute *attr, 435 char *buf) 436 { 437 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); 438 int nr = sensor_attr->index; 439 struct smsc47m192_data *data = smsc47m192_update_device(dev); 440 return sprintf(buf, "%u\n", (data->alarms & nr) ? 1 : 0); 441 } 442 443 static SENSOR_DEVICE_ATTR_RO(temp1_alarm, alarm, 0x0010); 444 static SENSOR_DEVICE_ATTR_RO(temp2_alarm, alarm, 0x0020); 445 static SENSOR_DEVICE_ATTR_RO(temp3_alarm, alarm, 0x0040); 446 static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, 0x4000); 447 static SENSOR_DEVICE_ATTR_RO(temp3_fault, alarm, 0x8000); 448 static SENSOR_DEVICE_ATTR_RO(in0_alarm, alarm, 0x0001); 449 static SENSOR_DEVICE_ATTR_RO(in1_alarm, alarm, 0x0002); 450 static SENSOR_DEVICE_ATTR_RO(in2_alarm, alarm, 0x0004); 451 static SENSOR_DEVICE_ATTR_RO(in3_alarm, alarm, 0x0008); 452 static SENSOR_DEVICE_ATTR_RO(in4_alarm, alarm, 0x0100); 453 static SENSOR_DEVICE_ATTR_RO(in5_alarm, alarm, 0x0200); 454 static SENSOR_DEVICE_ATTR_RO(in6_alarm, alarm, 0x0400); 455 static SENSOR_DEVICE_ATTR_RO(in7_alarm, alarm, 0x0800); 456 457 static struct attribute *smsc47m192_attributes[] = { 458 &sensor_dev_attr_in0_input.dev_attr.attr, 459 &sensor_dev_attr_in0_min.dev_attr.attr, 460 &sensor_dev_attr_in0_max.dev_attr.attr, 461 &sensor_dev_attr_in0_alarm.dev_attr.attr, 462 &sensor_dev_attr_in1_input.dev_attr.attr, 463 &sensor_dev_attr_in1_min.dev_attr.attr, 464 &sensor_dev_attr_in1_max.dev_attr.attr, 465 &sensor_dev_attr_in1_alarm.dev_attr.attr, 466 &sensor_dev_attr_in2_input.dev_attr.attr, 467 &sensor_dev_attr_in2_min.dev_attr.attr, 468 &sensor_dev_attr_in2_max.dev_attr.attr, 469 &sensor_dev_attr_in2_alarm.dev_attr.attr, 470 &sensor_dev_attr_in3_input.dev_attr.attr, 471 &sensor_dev_attr_in3_min.dev_attr.attr, 472 &sensor_dev_attr_in3_max.dev_attr.attr, 473 &sensor_dev_attr_in3_alarm.dev_attr.attr, 474 &sensor_dev_attr_in5_input.dev_attr.attr, 475 &sensor_dev_attr_in5_min.dev_attr.attr, 476 &sensor_dev_attr_in5_max.dev_attr.attr, 477 &sensor_dev_attr_in5_alarm.dev_attr.attr, 478 &sensor_dev_attr_in6_input.dev_attr.attr, 479 &sensor_dev_attr_in6_min.dev_attr.attr, 480 &sensor_dev_attr_in6_max.dev_attr.attr, 481 &sensor_dev_attr_in6_alarm.dev_attr.attr, 482 &sensor_dev_attr_in7_input.dev_attr.attr, 483 &sensor_dev_attr_in7_min.dev_attr.attr, 484 &sensor_dev_attr_in7_max.dev_attr.attr, 485 &sensor_dev_attr_in7_alarm.dev_attr.attr, 486 487 &sensor_dev_attr_temp1_input.dev_attr.attr, 488 &sensor_dev_attr_temp1_max.dev_attr.attr, 489 &sensor_dev_attr_temp1_min.dev_attr.attr, 490 &sensor_dev_attr_temp1_offset.dev_attr.attr, 491 &sensor_dev_attr_temp1_alarm.dev_attr.attr, 492 &sensor_dev_attr_temp2_input.dev_attr.attr, 493 &sensor_dev_attr_temp2_max.dev_attr.attr, 494 &sensor_dev_attr_temp2_min.dev_attr.attr, 495 &sensor_dev_attr_temp2_offset.dev_attr.attr, 496 &sensor_dev_attr_temp2_alarm.dev_attr.attr, 497 &sensor_dev_attr_temp2_fault.dev_attr.attr, 498 &sensor_dev_attr_temp3_input.dev_attr.attr, 499 &sensor_dev_attr_temp3_max.dev_attr.attr, 500 &sensor_dev_attr_temp3_min.dev_attr.attr, 501 &sensor_dev_attr_temp3_offset.dev_attr.attr, 502 &sensor_dev_attr_temp3_alarm.dev_attr.attr, 503 &sensor_dev_attr_temp3_fault.dev_attr.attr, 504 505 &dev_attr_cpu0_vid.attr, 506 &dev_attr_vrm.attr, 507 NULL 508 }; 509 510 static const struct attribute_group smsc47m192_group = { 511 .attrs = smsc47m192_attributes, 512 }; 513 514 static struct attribute *smsc47m192_attributes_in4[] = { 515 &sensor_dev_attr_in4_input.dev_attr.attr, 516 &sensor_dev_attr_in4_min.dev_attr.attr, 517 &sensor_dev_attr_in4_max.dev_attr.attr, 518 &sensor_dev_attr_in4_alarm.dev_attr.attr, 519 NULL 520 }; 521 522 static const struct attribute_group smsc47m192_group_in4 = { 523 .attrs = smsc47m192_attributes_in4, 524 }; 525 526 static void smsc47m192_init_client(struct i2c_client *client) 527 { 528 int i; 529 u8 config = i2c_smbus_read_byte_data(client, SMSC47M192_REG_CONFIG); 530 u8 sfr = i2c_smbus_read_byte_data(client, SMSC47M192_REG_SFR); 531 532 /* select cycle mode (pause 1 sec between updates) */ 533 i2c_smbus_write_byte_data(client, SMSC47M192_REG_SFR, 534 (sfr & 0xfd) | 0x02); 535 if (!(config & 0x01)) { 536 /* initialize alarm limits */ 537 for (i = 0; i < 8; i++) { 538 i2c_smbus_write_byte_data(client, 539 SMSC47M192_REG_IN_MIN(i), 0); 540 i2c_smbus_write_byte_data(client, 541 SMSC47M192_REG_IN_MAX(i), 0xff); 542 } 543 for (i = 0; i < 3; i++) { 544 i2c_smbus_write_byte_data(client, 545 SMSC47M192_REG_TEMP_MIN[i], 0x80); 546 i2c_smbus_write_byte_data(client, 547 SMSC47M192_REG_TEMP_MAX[i], 0x7f); 548 } 549 550 /* start monitoring */ 551 i2c_smbus_write_byte_data(client, SMSC47M192_REG_CONFIG, 552 (config & 0xf7) | 0x01); 553 } 554 } 555 556 /* Return 0 if detection is successful, -ENODEV otherwise */ 557 static int smsc47m192_detect(struct i2c_client *client, 558 struct i2c_board_info *info) 559 { 560 struct i2c_adapter *adapter = client->adapter; 561 int version; 562 563 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 564 return -ENODEV; 565 566 /* Detection criteria from sensors_detect script */ 567 version = i2c_smbus_read_byte_data(client, SMSC47M192_REG_VERSION); 568 if (i2c_smbus_read_byte_data(client, 569 SMSC47M192_REG_COMPANY_ID) == 0x55 570 && (version & 0xf0) == 0x20 571 && (i2c_smbus_read_byte_data(client, 572 SMSC47M192_REG_VID) & 0x70) == 0x00 573 && (i2c_smbus_read_byte_data(client, 574 SMSC47M192_REG_VID4) & 0xfe) == 0x80) { 575 dev_info(&adapter->dev, 576 "found SMSC47M192 or compatible, " 577 "version 2, stepping A%d\n", version & 0x0f); 578 } else { 579 dev_dbg(&adapter->dev, 580 "SMSC47M192 detection failed at 0x%02x\n", 581 client->addr); 582 return -ENODEV; 583 } 584 585 strscpy(info->type, "smsc47m192", I2C_NAME_SIZE); 586 587 return 0; 588 } 589 590 static int smsc47m192_probe(struct i2c_client *client) 591 { 592 struct device *dev = &client->dev; 593 struct device *hwmon_dev; 594 struct smsc47m192_data *data; 595 int config; 596 597 data = devm_kzalloc(dev, sizeof(struct smsc47m192_data), GFP_KERNEL); 598 if (!data) 599 return -ENOMEM; 600 601 data->client = client; 602 data->vrm = vid_which_vrm(); 603 mutex_init(&data->update_lock); 604 605 /* Initialize the SMSC47M192 chip */ 606 smsc47m192_init_client(client); 607 608 /* sysfs hooks */ 609 data->groups[0] = &smsc47m192_group; 610 /* Pin 110 is either in4 (+12V) or VID4 */ 611 config = i2c_smbus_read_byte_data(client, SMSC47M192_REG_CONFIG); 612 if (!(config & 0x20)) 613 data->groups[1] = &smsc47m192_group_in4; 614 615 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, 616 data, data->groups); 617 return PTR_ERR_OR_ZERO(hwmon_dev); 618 } 619 620 static const struct i2c_device_id smsc47m192_id[] = { 621 { "smsc47m192", 0 }, 622 { } 623 }; 624 MODULE_DEVICE_TABLE(i2c, smsc47m192_id); 625 626 static struct i2c_driver smsc47m192_driver = { 627 .class = I2C_CLASS_HWMON, 628 .driver = { 629 .name = "smsc47m192", 630 }, 631 .probe = smsc47m192_probe, 632 .id_table = smsc47m192_id, 633 .detect = smsc47m192_detect, 634 .address_list = normal_i2c, 635 }; 636 637 module_i2c_driver(smsc47m192_driver); 638 639 MODULE_AUTHOR("Hartmut Rick <linux@rick.claranet.de>"); 640 MODULE_DESCRIPTION("SMSC47M192 driver"); 641 MODULE_LICENSE("GPL"); 642