1 /* 2 * smsc47m192.c - Support for hardware monitoring block of 3 * SMSC LPC47M192 and compatible Super I/O chips 4 * 5 * Copyright (C) 2006 Hartmut Rick <linux@rick.claranet.de> 6 * 7 * Derived from lm78.c and other chip drivers. 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License as published by 11 * the Free Software Foundation; either version 2 of the License, or 12 * (at your option) any later version. 13 * 14 * This program is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 * GNU General Public License for more details. 18 * 19 * You should have received a copy of the GNU General Public License 20 * along with this program; if not, write to the Free Software 21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 22 */ 23 24 #include <linux/module.h> 25 #include <linux/init.h> 26 #include <linux/slab.h> 27 #include <linux/jiffies.h> 28 #include <linux/i2c.h> 29 #include <linux/hwmon.h> 30 #include <linux/hwmon-sysfs.h> 31 #include <linux/hwmon-vid.h> 32 #include <linux/err.h> 33 #include <linux/sysfs.h> 34 #include <linux/mutex.h> 35 36 /* Addresses to scan */ 37 static const unsigned short normal_i2c[] = { 0x2c, 0x2d, I2C_CLIENT_END }; 38 39 /* SMSC47M192 registers */ 40 #define SMSC47M192_REG_IN(nr) ((nr) < 6 ? (0x20 + (nr)) : \ 41 (0x50 + (nr) - 6)) 42 #define SMSC47M192_REG_IN_MAX(nr) ((nr) < 6 ? (0x2b + (nr) * 2) : \ 43 (0x54 + (((nr) - 6) * 2))) 44 #define SMSC47M192_REG_IN_MIN(nr) ((nr) < 6 ? (0x2c + (nr) * 2) : \ 45 (0x55 + (((nr) - 6) * 2))) 46 static u8 SMSC47M192_REG_TEMP[3] = { 0x27, 0x26, 0x52 }; 47 static u8 SMSC47M192_REG_TEMP_MAX[3] = { 0x39, 0x37, 0x58 }; 48 static u8 SMSC47M192_REG_TEMP_MIN[3] = { 0x3A, 0x38, 0x59 }; 49 #define SMSC47M192_REG_TEMP_OFFSET(nr) ((nr) == 2 ? 0x1e : 0x1f) 50 #define SMSC47M192_REG_ALARM1 0x41 51 #define SMSC47M192_REG_ALARM2 0x42 52 #define SMSC47M192_REG_VID 0x47 53 #define SMSC47M192_REG_VID4 0x49 54 #define SMSC47M192_REG_CONFIG 0x40 55 #define SMSC47M192_REG_SFR 0x4f 56 #define SMSC47M192_REG_COMPANY_ID 0x3e 57 #define SMSC47M192_REG_VERSION 0x3f 58 59 /* generalised scaling with integer rounding */ 60 static inline int SCALE(long val, int mul, int div) 61 { 62 if (val < 0) 63 return (val * mul - div / 2) / div; 64 else 65 return (val * mul + div / 2) / div; 66 } 67 68 /* Conversions */ 69 70 /* smsc47m192 internally scales voltage measurements */ 71 static const u16 nom_mv[] = { 2500, 2250, 3300, 5000, 12000, 3300, 1500, 1800 }; 72 73 static inline unsigned int IN_FROM_REG(u8 reg, int n) 74 { 75 return SCALE(reg, nom_mv[n], 192); 76 } 77 78 static inline u8 IN_TO_REG(unsigned long val, int n) 79 { 80 val = clamp_val(val, 0, nom_mv[n] * 255 / 192); 81 return SCALE(val, 192, nom_mv[n]); 82 } 83 84 /* 85 * TEMP: 0.001 degC units (-128C to +127C) 86 * REG: 1C/bit, two's complement 87 */ 88 static inline s8 TEMP_TO_REG(long val) 89 { 90 return SCALE(clamp_val(val, -128000, 127000), 1, 1000); 91 } 92 93 static inline int TEMP_FROM_REG(s8 val) 94 { 95 return val * 1000; 96 } 97 98 struct smsc47m192_data { 99 struct i2c_client *client; 100 const struct attribute_group *groups[3]; 101 struct mutex update_lock; 102 char valid; /* !=0 if following fields are valid */ 103 unsigned long last_updated; /* In jiffies */ 104 105 u8 in[8]; /* Register value */ 106 u8 in_max[8]; /* Register value */ 107 u8 in_min[8]; /* Register value */ 108 s8 temp[3]; /* Register value */ 109 s8 temp_max[3]; /* Register value */ 110 s8 temp_min[3]; /* Register value */ 111 s8 temp_offset[3]; /* Register value */ 112 u16 alarms; /* Register encoding, combined */ 113 u8 vid; /* Register encoding, combined */ 114 u8 vrm; 115 }; 116 117 static struct smsc47m192_data *smsc47m192_update_device(struct device *dev) 118 { 119 struct smsc47m192_data *data = dev_get_drvdata(dev); 120 struct i2c_client *client = data->client; 121 int i, config; 122 123 mutex_lock(&data->update_lock); 124 125 if (time_after(jiffies, data->last_updated + HZ + HZ / 2) 126 || !data->valid) { 127 u8 sfr = i2c_smbus_read_byte_data(client, SMSC47M192_REG_SFR); 128 129 dev_dbg(&client->dev, "Starting smsc47m192 update\n"); 130 131 for (i = 0; i <= 7; i++) { 132 data->in[i] = i2c_smbus_read_byte_data(client, 133 SMSC47M192_REG_IN(i)); 134 data->in_min[i] = i2c_smbus_read_byte_data(client, 135 SMSC47M192_REG_IN_MIN(i)); 136 data->in_max[i] = i2c_smbus_read_byte_data(client, 137 SMSC47M192_REG_IN_MAX(i)); 138 } 139 for (i = 0; i < 3; i++) { 140 data->temp[i] = i2c_smbus_read_byte_data(client, 141 SMSC47M192_REG_TEMP[i]); 142 data->temp_max[i] = i2c_smbus_read_byte_data(client, 143 SMSC47M192_REG_TEMP_MAX[i]); 144 data->temp_min[i] = i2c_smbus_read_byte_data(client, 145 SMSC47M192_REG_TEMP_MIN[i]); 146 } 147 for (i = 1; i < 3; i++) 148 data->temp_offset[i] = i2c_smbus_read_byte_data(client, 149 SMSC47M192_REG_TEMP_OFFSET(i)); 150 /* 151 * first offset is temp_offset[0] if SFR bit 4 is set, 152 * temp_offset[1] otherwise 153 */ 154 if (sfr & 0x10) { 155 data->temp_offset[0] = data->temp_offset[1]; 156 data->temp_offset[1] = 0; 157 } else 158 data->temp_offset[0] = 0; 159 160 data->vid = i2c_smbus_read_byte_data(client, SMSC47M192_REG_VID) 161 & 0x0f; 162 config = i2c_smbus_read_byte_data(client, 163 SMSC47M192_REG_CONFIG); 164 if (config & 0x20) 165 data->vid |= (i2c_smbus_read_byte_data(client, 166 SMSC47M192_REG_VID4) & 0x01) << 4; 167 data->alarms = i2c_smbus_read_byte_data(client, 168 SMSC47M192_REG_ALARM1) | 169 (i2c_smbus_read_byte_data(client, 170 SMSC47M192_REG_ALARM2) << 8); 171 172 data->last_updated = jiffies; 173 data->valid = 1; 174 } 175 176 mutex_unlock(&data->update_lock); 177 178 return data; 179 } 180 181 /* Voltages */ 182 static ssize_t in_show(struct device *dev, struct device_attribute *attr, 183 char *buf) 184 { 185 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); 186 int nr = sensor_attr->index; 187 struct smsc47m192_data *data = smsc47m192_update_device(dev); 188 return sprintf(buf, "%d\n", IN_FROM_REG(data->in[nr], nr)); 189 } 190 191 static ssize_t in_min_show(struct device *dev, struct device_attribute *attr, 192 char *buf) 193 { 194 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); 195 int nr = sensor_attr->index; 196 struct smsc47m192_data *data = smsc47m192_update_device(dev); 197 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[nr], nr)); 198 } 199 200 static ssize_t in_max_show(struct device *dev, struct device_attribute *attr, 201 char *buf) 202 { 203 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); 204 int nr = sensor_attr->index; 205 struct smsc47m192_data *data = smsc47m192_update_device(dev); 206 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[nr], nr)); 207 } 208 209 static ssize_t in_min_store(struct device *dev, struct device_attribute *attr, 210 const char *buf, size_t count) 211 { 212 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); 213 int nr = sensor_attr->index; 214 struct smsc47m192_data *data = dev_get_drvdata(dev); 215 struct i2c_client *client = data->client; 216 unsigned long val; 217 int err; 218 219 err = kstrtoul(buf, 10, &val); 220 if (err) 221 return err; 222 223 mutex_lock(&data->update_lock); 224 data->in_min[nr] = IN_TO_REG(val, nr); 225 i2c_smbus_write_byte_data(client, SMSC47M192_REG_IN_MIN(nr), 226 data->in_min[nr]); 227 mutex_unlock(&data->update_lock); 228 return count; 229 } 230 231 static ssize_t in_max_store(struct device *dev, struct device_attribute *attr, 232 const char *buf, size_t count) 233 { 234 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); 235 int nr = sensor_attr->index; 236 struct smsc47m192_data *data = dev_get_drvdata(dev); 237 struct i2c_client *client = data->client; 238 unsigned long val; 239 int err; 240 241 err = kstrtoul(buf, 10, &val); 242 if (err) 243 return err; 244 245 mutex_lock(&data->update_lock); 246 data->in_max[nr] = IN_TO_REG(val, nr); 247 i2c_smbus_write_byte_data(client, SMSC47M192_REG_IN_MAX(nr), 248 data->in_max[nr]); 249 mutex_unlock(&data->update_lock); 250 return count; 251 } 252 253 static SENSOR_DEVICE_ATTR_RO(in0_input, in, 0); 254 static SENSOR_DEVICE_ATTR_RW(in0_min, in_min, 0); 255 static SENSOR_DEVICE_ATTR_RW(in0_max, in_max, 0); 256 static SENSOR_DEVICE_ATTR_RO(in1_input, in, 1); 257 static SENSOR_DEVICE_ATTR_RW(in1_min, in_min, 1); 258 static SENSOR_DEVICE_ATTR_RW(in1_max, in_max, 1); 259 static SENSOR_DEVICE_ATTR_RO(in2_input, in, 2); 260 static SENSOR_DEVICE_ATTR_RW(in2_min, in_min, 2); 261 static SENSOR_DEVICE_ATTR_RW(in2_max, in_max, 2); 262 static SENSOR_DEVICE_ATTR_RO(in3_input, in, 3); 263 static SENSOR_DEVICE_ATTR_RW(in3_min, in_min, 3); 264 static SENSOR_DEVICE_ATTR_RW(in3_max, in_max, 3); 265 static SENSOR_DEVICE_ATTR_RO(in4_input, in, 4); 266 static SENSOR_DEVICE_ATTR_RW(in4_min, in_min, 4); 267 static SENSOR_DEVICE_ATTR_RW(in4_max, in_max, 4); 268 static SENSOR_DEVICE_ATTR_RO(in5_input, in, 5); 269 static SENSOR_DEVICE_ATTR_RW(in5_min, in_min, 5); 270 static SENSOR_DEVICE_ATTR_RW(in5_max, in_max, 5); 271 static SENSOR_DEVICE_ATTR_RO(in6_input, in, 6); 272 static SENSOR_DEVICE_ATTR_RW(in6_min, in_min, 6); 273 static SENSOR_DEVICE_ATTR_RW(in6_max, in_max, 6); 274 static SENSOR_DEVICE_ATTR_RO(in7_input, in, 7); 275 static SENSOR_DEVICE_ATTR_RW(in7_min, in_min, 7); 276 static SENSOR_DEVICE_ATTR_RW(in7_max, in_max, 7); 277 278 /* Temperatures */ 279 static ssize_t temp_show(struct device *dev, struct device_attribute *attr, 280 char *buf) 281 { 282 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); 283 int nr = sensor_attr->index; 284 struct smsc47m192_data *data = smsc47m192_update_device(dev); 285 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr])); 286 } 287 288 static ssize_t temp_min_show(struct device *dev, 289 struct device_attribute *attr, char *buf) 290 { 291 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); 292 int nr = sensor_attr->index; 293 struct smsc47m192_data *data = smsc47m192_update_device(dev); 294 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_min[nr])); 295 } 296 297 static ssize_t temp_max_show(struct device *dev, 298 struct device_attribute *attr, char *buf) 299 { 300 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); 301 int nr = sensor_attr->index; 302 struct smsc47m192_data *data = smsc47m192_update_device(dev); 303 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_max[nr])); 304 } 305 306 static ssize_t temp_min_store(struct device *dev, 307 struct device_attribute *attr, const char *buf, 308 size_t count) 309 { 310 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); 311 int nr = sensor_attr->index; 312 struct smsc47m192_data *data = dev_get_drvdata(dev); 313 struct i2c_client *client = data->client; 314 long val; 315 int err; 316 317 err = kstrtol(buf, 10, &val); 318 if (err) 319 return err; 320 321 mutex_lock(&data->update_lock); 322 data->temp_min[nr] = TEMP_TO_REG(val); 323 i2c_smbus_write_byte_data(client, SMSC47M192_REG_TEMP_MIN[nr], 324 data->temp_min[nr]); 325 mutex_unlock(&data->update_lock); 326 return count; 327 } 328 329 static ssize_t temp_max_store(struct device *dev, 330 struct device_attribute *attr, const char *buf, 331 size_t count) 332 { 333 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); 334 int nr = sensor_attr->index; 335 struct smsc47m192_data *data = dev_get_drvdata(dev); 336 struct i2c_client *client = data->client; 337 long val; 338 int err; 339 340 err = kstrtol(buf, 10, &val); 341 if (err) 342 return err; 343 344 mutex_lock(&data->update_lock); 345 data->temp_max[nr] = TEMP_TO_REG(val); 346 i2c_smbus_write_byte_data(client, SMSC47M192_REG_TEMP_MAX[nr], 347 data->temp_max[nr]); 348 mutex_unlock(&data->update_lock); 349 return count; 350 } 351 352 static ssize_t temp_offset_show(struct device *dev, 353 struct device_attribute *attr, char *buf) 354 { 355 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); 356 int nr = sensor_attr->index; 357 struct smsc47m192_data *data = smsc47m192_update_device(dev); 358 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_offset[nr])); 359 } 360 361 static ssize_t temp_offset_store(struct device *dev, 362 struct device_attribute *attr, 363 const char *buf, size_t count) 364 { 365 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); 366 int nr = sensor_attr->index; 367 struct smsc47m192_data *data = dev_get_drvdata(dev); 368 struct i2c_client *client = data->client; 369 u8 sfr = i2c_smbus_read_byte_data(client, SMSC47M192_REG_SFR); 370 long val; 371 int err; 372 373 err = kstrtol(buf, 10, &val); 374 if (err) 375 return err; 376 377 mutex_lock(&data->update_lock); 378 data->temp_offset[nr] = TEMP_TO_REG(val); 379 if (nr > 1) 380 i2c_smbus_write_byte_data(client, 381 SMSC47M192_REG_TEMP_OFFSET(nr), data->temp_offset[nr]); 382 else if (data->temp_offset[nr] != 0) { 383 /* 384 * offset[0] and offset[1] share the same register, 385 * SFR bit 4 activates offset[0] 386 */ 387 i2c_smbus_write_byte_data(client, SMSC47M192_REG_SFR, 388 (sfr & 0xef) | (nr == 0 ? 0x10 : 0)); 389 data->temp_offset[1-nr] = 0; 390 i2c_smbus_write_byte_data(client, 391 SMSC47M192_REG_TEMP_OFFSET(nr), data->temp_offset[nr]); 392 } else if ((sfr & 0x10) == (nr == 0 ? 0x10 : 0)) 393 i2c_smbus_write_byte_data(client, 394 SMSC47M192_REG_TEMP_OFFSET(nr), 0); 395 mutex_unlock(&data->update_lock); 396 return count; 397 } 398 399 static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, 0); 400 static SENSOR_DEVICE_ATTR_RW(temp1_min, temp_min, 0); 401 static SENSOR_DEVICE_ATTR_RW(temp1_max, temp_max, 0); 402 static SENSOR_DEVICE_ATTR_RW(temp1_offset, temp_offset, 0); 403 static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, 1); 404 static SENSOR_DEVICE_ATTR_RW(temp2_min, temp_min, 1); 405 static SENSOR_DEVICE_ATTR_RW(temp2_max, temp_max, 1); 406 static SENSOR_DEVICE_ATTR_RW(temp2_offset, temp_offset, 1); 407 static SENSOR_DEVICE_ATTR_RO(temp3_input, temp, 2); 408 static SENSOR_DEVICE_ATTR_RW(temp3_min, temp_min, 2); 409 static SENSOR_DEVICE_ATTR_RW(temp3_max, temp_max, 2); 410 static SENSOR_DEVICE_ATTR_RW(temp3_offset, temp_offset, 2); 411 412 /* VID */ 413 static ssize_t cpu0_vid_show(struct device *dev, 414 struct device_attribute *attr, char *buf) 415 { 416 struct smsc47m192_data *data = smsc47m192_update_device(dev); 417 return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm)); 418 } 419 static DEVICE_ATTR_RO(cpu0_vid); 420 421 static ssize_t vrm_show(struct device *dev, struct device_attribute *attr, 422 char *buf) 423 { 424 struct smsc47m192_data *data = dev_get_drvdata(dev); 425 return sprintf(buf, "%d\n", data->vrm); 426 } 427 428 static ssize_t vrm_store(struct device *dev, struct device_attribute *attr, 429 const char *buf, size_t count) 430 { 431 struct smsc47m192_data *data = dev_get_drvdata(dev); 432 unsigned long val; 433 int err; 434 435 err = kstrtoul(buf, 10, &val); 436 if (err) 437 return err; 438 if (val > 255) 439 return -EINVAL; 440 441 data->vrm = val; 442 return count; 443 } 444 static DEVICE_ATTR_RW(vrm); 445 446 /* Alarms */ 447 static ssize_t alarm_show(struct device *dev, struct device_attribute *attr, 448 char *buf) 449 { 450 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); 451 int nr = sensor_attr->index; 452 struct smsc47m192_data *data = smsc47m192_update_device(dev); 453 return sprintf(buf, "%u\n", (data->alarms & nr) ? 1 : 0); 454 } 455 456 static SENSOR_DEVICE_ATTR_RO(temp1_alarm, alarm, 0x0010); 457 static SENSOR_DEVICE_ATTR_RO(temp2_alarm, alarm, 0x0020); 458 static SENSOR_DEVICE_ATTR_RO(temp3_alarm, alarm, 0x0040); 459 static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, 0x4000); 460 static SENSOR_DEVICE_ATTR_RO(temp3_fault, alarm, 0x8000); 461 static SENSOR_DEVICE_ATTR_RO(in0_alarm, alarm, 0x0001); 462 static SENSOR_DEVICE_ATTR_RO(in1_alarm, alarm, 0x0002); 463 static SENSOR_DEVICE_ATTR_RO(in2_alarm, alarm, 0x0004); 464 static SENSOR_DEVICE_ATTR_RO(in3_alarm, alarm, 0x0008); 465 static SENSOR_DEVICE_ATTR_RO(in4_alarm, alarm, 0x0100); 466 static SENSOR_DEVICE_ATTR_RO(in5_alarm, alarm, 0x0200); 467 static SENSOR_DEVICE_ATTR_RO(in6_alarm, alarm, 0x0400); 468 static SENSOR_DEVICE_ATTR_RO(in7_alarm, alarm, 0x0800); 469 470 static struct attribute *smsc47m192_attributes[] = { 471 &sensor_dev_attr_in0_input.dev_attr.attr, 472 &sensor_dev_attr_in0_min.dev_attr.attr, 473 &sensor_dev_attr_in0_max.dev_attr.attr, 474 &sensor_dev_attr_in0_alarm.dev_attr.attr, 475 &sensor_dev_attr_in1_input.dev_attr.attr, 476 &sensor_dev_attr_in1_min.dev_attr.attr, 477 &sensor_dev_attr_in1_max.dev_attr.attr, 478 &sensor_dev_attr_in1_alarm.dev_attr.attr, 479 &sensor_dev_attr_in2_input.dev_attr.attr, 480 &sensor_dev_attr_in2_min.dev_attr.attr, 481 &sensor_dev_attr_in2_max.dev_attr.attr, 482 &sensor_dev_attr_in2_alarm.dev_attr.attr, 483 &sensor_dev_attr_in3_input.dev_attr.attr, 484 &sensor_dev_attr_in3_min.dev_attr.attr, 485 &sensor_dev_attr_in3_max.dev_attr.attr, 486 &sensor_dev_attr_in3_alarm.dev_attr.attr, 487 &sensor_dev_attr_in5_input.dev_attr.attr, 488 &sensor_dev_attr_in5_min.dev_attr.attr, 489 &sensor_dev_attr_in5_max.dev_attr.attr, 490 &sensor_dev_attr_in5_alarm.dev_attr.attr, 491 &sensor_dev_attr_in6_input.dev_attr.attr, 492 &sensor_dev_attr_in6_min.dev_attr.attr, 493 &sensor_dev_attr_in6_max.dev_attr.attr, 494 &sensor_dev_attr_in6_alarm.dev_attr.attr, 495 &sensor_dev_attr_in7_input.dev_attr.attr, 496 &sensor_dev_attr_in7_min.dev_attr.attr, 497 &sensor_dev_attr_in7_max.dev_attr.attr, 498 &sensor_dev_attr_in7_alarm.dev_attr.attr, 499 500 &sensor_dev_attr_temp1_input.dev_attr.attr, 501 &sensor_dev_attr_temp1_max.dev_attr.attr, 502 &sensor_dev_attr_temp1_min.dev_attr.attr, 503 &sensor_dev_attr_temp1_offset.dev_attr.attr, 504 &sensor_dev_attr_temp1_alarm.dev_attr.attr, 505 &sensor_dev_attr_temp2_input.dev_attr.attr, 506 &sensor_dev_attr_temp2_max.dev_attr.attr, 507 &sensor_dev_attr_temp2_min.dev_attr.attr, 508 &sensor_dev_attr_temp2_offset.dev_attr.attr, 509 &sensor_dev_attr_temp2_alarm.dev_attr.attr, 510 &sensor_dev_attr_temp2_fault.dev_attr.attr, 511 &sensor_dev_attr_temp3_input.dev_attr.attr, 512 &sensor_dev_attr_temp3_max.dev_attr.attr, 513 &sensor_dev_attr_temp3_min.dev_attr.attr, 514 &sensor_dev_attr_temp3_offset.dev_attr.attr, 515 &sensor_dev_attr_temp3_alarm.dev_attr.attr, 516 &sensor_dev_attr_temp3_fault.dev_attr.attr, 517 518 &dev_attr_cpu0_vid.attr, 519 &dev_attr_vrm.attr, 520 NULL 521 }; 522 523 static const struct attribute_group smsc47m192_group = { 524 .attrs = smsc47m192_attributes, 525 }; 526 527 static struct attribute *smsc47m192_attributes_in4[] = { 528 &sensor_dev_attr_in4_input.dev_attr.attr, 529 &sensor_dev_attr_in4_min.dev_attr.attr, 530 &sensor_dev_attr_in4_max.dev_attr.attr, 531 &sensor_dev_attr_in4_alarm.dev_attr.attr, 532 NULL 533 }; 534 535 static const struct attribute_group smsc47m192_group_in4 = { 536 .attrs = smsc47m192_attributes_in4, 537 }; 538 539 static void smsc47m192_init_client(struct i2c_client *client) 540 { 541 int i; 542 u8 config = i2c_smbus_read_byte_data(client, SMSC47M192_REG_CONFIG); 543 u8 sfr = i2c_smbus_read_byte_data(client, SMSC47M192_REG_SFR); 544 545 /* select cycle mode (pause 1 sec between updates) */ 546 i2c_smbus_write_byte_data(client, SMSC47M192_REG_SFR, 547 (sfr & 0xfd) | 0x02); 548 if (!(config & 0x01)) { 549 /* initialize alarm limits */ 550 for (i = 0; i < 8; i++) { 551 i2c_smbus_write_byte_data(client, 552 SMSC47M192_REG_IN_MIN(i), 0); 553 i2c_smbus_write_byte_data(client, 554 SMSC47M192_REG_IN_MAX(i), 0xff); 555 } 556 for (i = 0; i < 3; i++) { 557 i2c_smbus_write_byte_data(client, 558 SMSC47M192_REG_TEMP_MIN[i], 0x80); 559 i2c_smbus_write_byte_data(client, 560 SMSC47M192_REG_TEMP_MAX[i], 0x7f); 561 } 562 563 /* start monitoring */ 564 i2c_smbus_write_byte_data(client, SMSC47M192_REG_CONFIG, 565 (config & 0xf7) | 0x01); 566 } 567 } 568 569 /* Return 0 if detection is successful, -ENODEV otherwise */ 570 static int smsc47m192_detect(struct i2c_client *client, 571 struct i2c_board_info *info) 572 { 573 struct i2c_adapter *adapter = client->adapter; 574 int version; 575 576 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 577 return -ENODEV; 578 579 /* Detection criteria from sensors_detect script */ 580 version = i2c_smbus_read_byte_data(client, SMSC47M192_REG_VERSION); 581 if (i2c_smbus_read_byte_data(client, 582 SMSC47M192_REG_COMPANY_ID) == 0x55 583 && (version & 0xf0) == 0x20 584 && (i2c_smbus_read_byte_data(client, 585 SMSC47M192_REG_VID) & 0x70) == 0x00 586 && (i2c_smbus_read_byte_data(client, 587 SMSC47M192_REG_VID4) & 0xfe) == 0x80) { 588 dev_info(&adapter->dev, 589 "found SMSC47M192 or compatible, " 590 "version 2, stepping A%d\n", version & 0x0f); 591 } else { 592 dev_dbg(&adapter->dev, 593 "SMSC47M192 detection failed at 0x%02x\n", 594 client->addr); 595 return -ENODEV; 596 } 597 598 strlcpy(info->type, "smsc47m192", I2C_NAME_SIZE); 599 600 return 0; 601 } 602 603 static int smsc47m192_probe(struct i2c_client *client, 604 const struct i2c_device_id *id) 605 { 606 struct device *dev = &client->dev; 607 struct device *hwmon_dev; 608 struct smsc47m192_data *data; 609 int config; 610 611 data = devm_kzalloc(dev, sizeof(struct smsc47m192_data), GFP_KERNEL); 612 if (!data) 613 return -ENOMEM; 614 615 data->client = client; 616 data->vrm = vid_which_vrm(); 617 mutex_init(&data->update_lock); 618 619 /* Initialize the SMSC47M192 chip */ 620 smsc47m192_init_client(client); 621 622 /* sysfs hooks */ 623 data->groups[0] = &smsc47m192_group; 624 /* Pin 110 is either in4 (+12V) or VID4 */ 625 config = i2c_smbus_read_byte_data(client, SMSC47M192_REG_CONFIG); 626 if (!(config & 0x20)) 627 data->groups[1] = &smsc47m192_group_in4; 628 629 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, 630 data, data->groups); 631 return PTR_ERR_OR_ZERO(hwmon_dev); 632 } 633 634 static const struct i2c_device_id smsc47m192_id[] = { 635 { "smsc47m192", 0 }, 636 { } 637 }; 638 MODULE_DEVICE_TABLE(i2c, smsc47m192_id); 639 640 static struct i2c_driver smsc47m192_driver = { 641 .class = I2C_CLASS_HWMON, 642 .driver = { 643 .name = "smsc47m192", 644 }, 645 .probe = smsc47m192_probe, 646 .id_table = smsc47m192_id, 647 .detect = smsc47m192_detect, 648 .address_list = normal_i2c, 649 }; 650 651 module_i2c_driver(smsc47m192_driver); 652 653 MODULE_AUTHOR("Hartmut Rick <linux@rick.claranet.de>"); 654 MODULE_DESCRIPTION("SMSC47M192 driver"); 655 MODULE_LICENSE("GPL"); 656