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 return clamp_val(SCALE(val, 192, nom_mv[n]), 0, 255); 81 } 82 83 /* 84 * TEMP: 0.001 degC units (-128C to +127C) 85 * REG: 1C/bit, two's complement 86 */ 87 static inline s8 TEMP_TO_REG(int val) 88 { 89 return SCALE(clamp_val(val, -128000, 127000), 1, 1000); 90 } 91 92 static inline int TEMP_FROM_REG(s8 val) 93 { 94 return val * 1000; 95 } 96 97 struct smsc47m192_data { 98 struct i2c_client *client; 99 const struct attribute_group *groups[3]; 100 struct mutex update_lock; 101 char valid; /* !=0 if following fields are valid */ 102 unsigned long last_updated; /* In jiffies */ 103 104 u8 in[8]; /* Register value */ 105 u8 in_max[8]; /* Register value */ 106 u8 in_min[8]; /* Register value */ 107 s8 temp[3]; /* Register value */ 108 s8 temp_max[3]; /* Register value */ 109 s8 temp_min[3]; /* Register value */ 110 s8 temp_offset[3]; /* Register value */ 111 u16 alarms; /* Register encoding, combined */ 112 u8 vid; /* Register encoding, combined */ 113 u8 vrm; 114 }; 115 116 static struct smsc47m192_data *smsc47m192_update_device(struct device *dev) 117 { 118 struct smsc47m192_data *data = dev_get_drvdata(dev); 119 struct i2c_client *client = data->client; 120 int i, config; 121 122 mutex_lock(&data->update_lock); 123 124 if (time_after(jiffies, data->last_updated + HZ + HZ / 2) 125 || !data->valid) { 126 u8 sfr = i2c_smbus_read_byte_data(client, SMSC47M192_REG_SFR); 127 128 dev_dbg(&client->dev, "Starting smsc47m192 update\n"); 129 130 for (i = 0; i <= 7; i++) { 131 data->in[i] = i2c_smbus_read_byte_data(client, 132 SMSC47M192_REG_IN(i)); 133 data->in_min[i] = i2c_smbus_read_byte_data(client, 134 SMSC47M192_REG_IN_MIN(i)); 135 data->in_max[i] = i2c_smbus_read_byte_data(client, 136 SMSC47M192_REG_IN_MAX(i)); 137 } 138 for (i = 0; i < 3; i++) { 139 data->temp[i] = i2c_smbus_read_byte_data(client, 140 SMSC47M192_REG_TEMP[i]); 141 data->temp_max[i] = i2c_smbus_read_byte_data(client, 142 SMSC47M192_REG_TEMP_MAX[i]); 143 data->temp_min[i] = i2c_smbus_read_byte_data(client, 144 SMSC47M192_REG_TEMP_MIN[i]); 145 } 146 for (i = 1; i < 3; i++) 147 data->temp_offset[i] = i2c_smbus_read_byte_data(client, 148 SMSC47M192_REG_TEMP_OFFSET(i)); 149 /* 150 * first offset is temp_offset[0] if SFR bit 4 is set, 151 * temp_offset[1] otherwise 152 */ 153 if (sfr & 0x10) { 154 data->temp_offset[0] = data->temp_offset[1]; 155 data->temp_offset[1] = 0; 156 } else 157 data->temp_offset[0] = 0; 158 159 data->vid = i2c_smbus_read_byte_data(client, SMSC47M192_REG_VID) 160 & 0x0f; 161 config = i2c_smbus_read_byte_data(client, 162 SMSC47M192_REG_CONFIG); 163 if (config & 0x20) 164 data->vid |= (i2c_smbus_read_byte_data(client, 165 SMSC47M192_REG_VID4) & 0x01) << 4; 166 data->alarms = i2c_smbus_read_byte_data(client, 167 SMSC47M192_REG_ALARM1) | 168 (i2c_smbus_read_byte_data(client, 169 SMSC47M192_REG_ALARM2) << 8); 170 171 data->last_updated = jiffies; 172 data->valid = 1; 173 } 174 175 mutex_unlock(&data->update_lock); 176 177 return data; 178 } 179 180 /* Voltages */ 181 static ssize_t show_in(struct device *dev, struct device_attribute *attr, 182 char *buf) 183 { 184 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); 185 int nr = sensor_attr->index; 186 struct smsc47m192_data *data = smsc47m192_update_device(dev); 187 return sprintf(buf, "%d\n", IN_FROM_REG(data->in[nr], nr)); 188 } 189 190 static ssize_t show_in_min(struct device *dev, struct device_attribute *attr, 191 char *buf) 192 { 193 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); 194 int nr = sensor_attr->index; 195 struct smsc47m192_data *data = smsc47m192_update_device(dev); 196 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[nr], nr)); 197 } 198 199 static ssize_t show_in_max(struct device *dev, struct device_attribute *attr, 200 char *buf) 201 { 202 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); 203 int nr = sensor_attr->index; 204 struct smsc47m192_data *data = smsc47m192_update_device(dev); 205 return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[nr], nr)); 206 } 207 208 static ssize_t set_in_min(struct device *dev, struct device_attribute *attr, 209 const char *buf, size_t count) 210 { 211 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); 212 int nr = sensor_attr->index; 213 struct smsc47m192_data *data = dev_get_drvdata(dev); 214 struct i2c_client *client = data->client; 215 unsigned long val; 216 int err; 217 218 err = kstrtoul(buf, 10, &val); 219 if (err) 220 return err; 221 222 mutex_lock(&data->update_lock); 223 data->in_min[nr] = IN_TO_REG(val, nr); 224 i2c_smbus_write_byte_data(client, SMSC47M192_REG_IN_MIN(nr), 225 data->in_min[nr]); 226 mutex_unlock(&data->update_lock); 227 return count; 228 } 229 230 static ssize_t set_in_max(struct device *dev, struct device_attribute *attr, 231 const char *buf, size_t count) 232 { 233 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); 234 int nr = sensor_attr->index; 235 struct smsc47m192_data *data = dev_get_drvdata(dev); 236 struct i2c_client *client = data->client; 237 unsigned long val; 238 int err; 239 240 err = kstrtoul(buf, 10, &val); 241 if (err) 242 return err; 243 244 mutex_lock(&data->update_lock); 245 data->in_max[nr] = IN_TO_REG(val, nr); 246 i2c_smbus_write_byte_data(client, SMSC47M192_REG_IN_MAX(nr), 247 data->in_max[nr]); 248 mutex_unlock(&data->update_lock); 249 return count; 250 } 251 252 #define show_in_offset(offset) \ 253 static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO, \ 254 show_in, NULL, offset); \ 255 static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \ 256 show_in_min, set_in_min, offset); \ 257 static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \ 258 show_in_max, set_in_max, offset); 259 260 show_in_offset(0) 261 show_in_offset(1) 262 show_in_offset(2) 263 show_in_offset(3) 264 show_in_offset(4) 265 show_in_offset(5) 266 show_in_offset(6) 267 show_in_offset(7) 268 269 /* Temperatures */ 270 static ssize_t show_temp(struct device *dev, struct device_attribute *attr, 271 char *buf) 272 { 273 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); 274 int nr = sensor_attr->index; 275 struct smsc47m192_data *data = smsc47m192_update_device(dev); 276 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr])); 277 } 278 279 static ssize_t show_temp_min(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_min[nr])); 286 } 287 288 static ssize_t show_temp_max(struct device *dev, struct device_attribute *attr, 289 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_max[nr])); 295 } 296 297 static ssize_t set_temp_min(struct device *dev, struct device_attribute *attr, 298 const char *buf, size_t count) 299 { 300 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); 301 int nr = sensor_attr->index; 302 struct smsc47m192_data *data = dev_get_drvdata(dev); 303 struct i2c_client *client = data->client; 304 long val; 305 int err; 306 307 err = kstrtol(buf, 10, &val); 308 if (err) 309 return err; 310 311 mutex_lock(&data->update_lock); 312 data->temp_min[nr] = TEMP_TO_REG(val); 313 i2c_smbus_write_byte_data(client, SMSC47M192_REG_TEMP_MIN[nr], 314 data->temp_min[nr]); 315 mutex_unlock(&data->update_lock); 316 return count; 317 } 318 319 static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr, 320 const char *buf, size_t count) 321 { 322 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); 323 int nr = sensor_attr->index; 324 struct smsc47m192_data *data = dev_get_drvdata(dev); 325 struct i2c_client *client = data->client; 326 long val; 327 int err; 328 329 err = kstrtol(buf, 10, &val); 330 if (err) 331 return err; 332 333 mutex_lock(&data->update_lock); 334 data->temp_max[nr] = TEMP_TO_REG(val); 335 i2c_smbus_write_byte_data(client, SMSC47M192_REG_TEMP_MAX[nr], 336 data->temp_max[nr]); 337 mutex_unlock(&data->update_lock); 338 return count; 339 } 340 341 static ssize_t show_temp_offset(struct device *dev, struct device_attribute 342 *attr, char *buf) 343 { 344 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); 345 int nr = sensor_attr->index; 346 struct smsc47m192_data *data = smsc47m192_update_device(dev); 347 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_offset[nr])); 348 } 349 350 static ssize_t set_temp_offset(struct device *dev, struct device_attribute 351 *attr, const char *buf, size_t count) 352 { 353 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); 354 int nr = sensor_attr->index; 355 struct smsc47m192_data *data = dev_get_drvdata(dev); 356 struct i2c_client *client = data->client; 357 u8 sfr = i2c_smbus_read_byte_data(client, SMSC47M192_REG_SFR); 358 long val; 359 int err; 360 361 err = kstrtol(buf, 10, &val); 362 if (err) 363 return err; 364 365 mutex_lock(&data->update_lock); 366 data->temp_offset[nr] = TEMP_TO_REG(val); 367 if (nr > 1) 368 i2c_smbus_write_byte_data(client, 369 SMSC47M192_REG_TEMP_OFFSET(nr), data->temp_offset[nr]); 370 else if (data->temp_offset[nr] != 0) { 371 /* 372 * offset[0] and offset[1] share the same register, 373 * SFR bit 4 activates offset[0] 374 */ 375 i2c_smbus_write_byte_data(client, SMSC47M192_REG_SFR, 376 (sfr & 0xef) | (nr == 0 ? 0x10 : 0)); 377 data->temp_offset[1-nr] = 0; 378 i2c_smbus_write_byte_data(client, 379 SMSC47M192_REG_TEMP_OFFSET(nr), data->temp_offset[nr]); 380 } else if ((sfr & 0x10) == (nr == 0 ? 0x10 : 0)) 381 i2c_smbus_write_byte_data(client, 382 SMSC47M192_REG_TEMP_OFFSET(nr), 0); 383 mutex_unlock(&data->update_lock); 384 return count; 385 } 386 387 #define show_temp_index(index) \ 388 static SENSOR_DEVICE_ATTR(temp##index##_input, S_IRUGO, \ 389 show_temp, NULL, index-1); \ 390 static SENSOR_DEVICE_ATTR(temp##index##_min, S_IRUGO | S_IWUSR, \ 391 show_temp_min, set_temp_min, index-1); \ 392 static SENSOR_DEVICE_ATTR(temp##index##_max, S_IRUGO | S_IWUSR, \ 393 show_temp_max, set_temp_max, index-1); \ 394 static SENSOR_DEVICE_ATTR(temp##index##_offset, S_IRUGO | S_IWUSR, \ 395 show_temp_offset, set_temp_offset, index-1); 396 397 show_temp_index(1) 398 show_temp_index(2) 399 show_temp_index(3) 400 401 /* VID */ 402 static ssize_t show_vid(struct device *dev, struct device_attribute *attr, 403 char *buf) 404 { 405 struct smsc47m192_data *data = smsc47m192_update_device(dev); 406 return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm)); 407 } 408 static DEVICE_ATTR(cpu0_vid, S_IRUGO, show_vid, NULL); 409 410 static ssize_t show_vrm(struct device *dev, struct device_attribute *attr, 411 char *buf) 412 { 413 struct smsc47m192_data *data = dev_get_drvdata(dev); 414 return sprintf(buf, "%d\n", data->vrm); 415 } 416 417 static ssize_t set_vrm(struct device *dev, struct device_attribute *attr, 418 const char *buf, size_t count) 419 { 420 struct smsc47m192_data *data = dev_get_drvdata(dev); 421 unsigned long val; 422 int err; 423 424 err = kstrtoul(buf, 10, &val); 425 if (err) 426 return err; 427 if (val > 255) 428 return -EINVAL; 429 430 data->vrm = val; 431 return count; 432 } 433 static DEVICE_ATTR(vrm, S_IRUGO | S_IWUSR, show_vrm, set_vrm); 434 435 /* Alarms */ 436 static ssize_t show_alarm(struct device *dev, struct device_attribute *attr, 437 char *buf) 438 { 439 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); 440 int nr = sensor_attr->index; 441 struct smsc47m192_data *data = smsc47m192_update_device(dev); 442 return sprintf(buf, "%u\n", (data->alarms & nr) ? 1 : 0); 443 } 444 445 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 0x0010); 446 static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 0x0020); 447 static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 0x0040); 448 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 0x4000); 449 static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 0x8000); 450 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0x0001); 451 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 0x0002); 452 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 0x0004); 453 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 0x0008); 454 static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 0x0100); 455 static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 0x0200); 456 static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 0x0400); 457 static SENSOR_DEVICE_ATTR(in7_alarm, S_IRUGO, show_alarm, NULL, 0x0800); 458 459 static struct attribute *smsc47m192_attributes[] = { 460 &sensor_dev_attr_in0_input.dev_attr.attr, 461 &sensor_dev_attr_in0_min.dev_attr.attr, 462 &sensor_dev_attr_in0_max.dev_attr.attr, 463 &sensor_dev_attr_in0_alarm.dev_attr.attr, 464 &sensor_dev_attr_in1_input.dev_attr.attr, 465 &sensor_dev_attr_in1_min.dev_attr.attr, 466 &sensor_dev_attr_in1_max.dev_attr.attr, 467 &sensor_dev_attr_in1_alarm.dev_attr.attr, 468 &sensor_dev_attr_in2_input.dev_attr.attr, 469 &sensor_dev_attr_in2_min.dev_attr.attr, 470 &sensor_dev_attr_in2_max.dev_attr.attr, 471 &sensor_dev_attr_in2_alarm.dev_attr.attr, 472 &sensor_dev_attr_in3_input.dev_attr.attr, 473 &sensor_dev_attr_in3_min.dev_attr.attr, 474 &sensor_dev_attr_in3_max.dev_attr.attr, 475 &sensor_dev_attr_in3_alarm.dev_attr.attr, 476 &sensor_dev_attr_in5_input.dev_attr.attr, 477 &sensor_dev_attr_in5_min.dev_attr.attr, 478 &sensor_dev_attr_in5_max.dev_attr.attr, 479 &sensor_dev_attr_in5_alarm.dev_attr.attr, 480 &sensor_dev_attr_in6_input.dev_attr.attr, 481 &sensor_dev_attr_in6_min.dev_attr.attr, 482 &sensor_dev_attr_in6_max.dev_attr.attr, 483 &sensor_dev_attr_in6_alarm.dev_attr.attr, 484 &sensor_dev_attr_in7_input.dev_attr.attr, 485 &sensor_dev_attr_in7_min.dev_attr.attr, 486 &sensor_dev_attr_in7_max.dev_attr.attr, 487 &sensor_dev_attr_in7_alarm.dev_attr.attr, 488 489 &sensor_dev_attr_temp1_input.dev_attr.attr, 490 &sensor_dev_attr_temp1_max.dev_attr.attr, 491 &sensor_dev_attr_temp1_min.dev_attr.attr, 492 &sensor_dev_attr_temp1_offset.dev_attr.attr, 493 &sensor_dev_attr_temp1_alarm.dev_attr.attr, 494 &sensor_dev_attr_temp2_input.dev_attr.attr, 495 &sensor_dev_attr_temp2_max.dev_attr.attr, 496 &sensor_dev_attr_temp2_min.dev_attr.attr, 497 &sensor_dev_attr_temp2_offset.dev_attr.attr, 498 &sensor_dev_attr_temp2_alarm.dev_attr.attr, 499 &sensor_dev_attr_temp2_fault.dev_attr.attr, 500 &sensor_dev_attr_temp3_input.dev_attr.attr, 501 &sensor_dev_attr_temp3_max.dev_attr.attr, 502 &sensor_dev_attr_temp3_min.dev_attr.attr, 503 &sensor_dev_attr_temp3_offset.dev_attr.attr, 504 &sensor_dev_attr_temp3_alarm.dev_attr.attr, 505 &sensor_dev_attr_temp3_fault.dev_attr.attr, 506 507 &dev_attr_cpu0_vid.attr, 508 &dev_attr_vrm.attr, 509 NULL 510 }; 511 512 static const struct attribute_group smsc47m192_group = { 513 .attrs = smsc47m192_attributes, 514 }; 515 516 static struct attribute *smsc47m192_attributes_in4[] = { 517 &sensor_dev_attr_in4_input.dev_attr.attr, 518 &sensor_dev_attr_in4_min.dev_attr.attr, 519 &sensor_dev_attr_in4_max.dev_attr.attr, 520 &sensor_dev_attr_in4_alarm.dev_attr.attr, 521 NULL 522 }; 523 524 static const struct attribute_group smsc47m192_group_in4 = { 525 .attrs = smsc47m192_attributes_in4, 526 }; 527 528 static void smsc47m192_init_client(struct i2c_client *client) 529 { 530 int i; 531 u8 config = i2c_smbus_read_byte_data(client, SMSC47M192_REG_CONFIG); 532 u8 sfr = i2c_smbus_read_byte_data(client, SMSC47M192_REG_SFR); 533 534 /* select cycle mode (pause 1 sec between updates) */ 535 i2c_smbus_write_byte_data(client, SMSC47M192_REG_SFR, 536 (sfr & 0xfd) | 0x02); 537 if (!(config & 0x01)) { 538 /* initialize alarm limits */ 539 for (i = 0; i < 8; i++) { 540 i2c_smbus_write_byte_data(client, 541 SMSC47M192_REG_IN_MIN(i), 0); 542 i2c_smbus_write_byte_data(client, 543 SMSC47M192_REG_IN_MAX(i), 0xff); 544 } 545 for (i = 0; i < 3; i++) { 546 i2c_smbus_write_byte_data(client, 547 SMSC47M192_REG_TEMP_MIN[i], 0x80); 548 i2c_smbus_write_byte_data(client, 549 SMSC47M192_REG_TEMP_MAX[i], 0x7f); 550 } 551 552 /* start monitoring */ 553 i2c_smbus_write_byte_data(client, SMSC47M192_REG_CONFIG, 554 (config & 0xf7) | 0x01); 555 } 556 } 557 558 /* Return 0 if detection is successful, -ENODEV otherwise */ 559 static int smsc47m192_detect(struct i2c_client *client, 560 struct i2c_board_info *info) 561 { 562 struct i2c_adapter *adapter = client->adapter; 563 int version; 564 565 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 566 return -ENODEV; 567 568 /* Detection criteria from sensors_detect script */ 569 version = i2c_smbus_read_byte_data(client, SMSC47M192_REG_VERSION); 570 if (i2c_smbus_read_byte_data(client, 571 SMSC47M192_REG_COMPANY_ID) == 0x55 572 && (version & 0xf0) == 0x20 573 && (i2c_smbus_read_byte_data(client, 574 SMSC47M192_REG_VID) & 0x70) == 0x00 575 && (i2c_smbus_read_byte_data(client, 576 SMSC47M192_REG_VID4) & 0xfe) == 0x80) { 577 dev_info(&adapter->dev, 578 "found SMSC47M192 or compatible, " 579 "version 2, stepping A%d\n", version & 0x0f); 580 } else { 581 dev_dbg(&adapter->dev, 582 "SMSC47M192 detection failed at 0x%02x\n", 583 client->addr); 584 return -ENODEV; 585 } 586 587 strlcpy(info->type, "smsc47m192", I2C_NAME_SIZE); 588 589 return 0; 590 } 591 592 static int smsc47m192_probe(struct i2c_client *client, 593 const struct i2c_device_id *id) 594 { 595 struct device *dev = &client->dev; 596 struct device *hwmon_dev; 597 struct smsc47m192_data *data; 598 int config; 599 600 data = devm_kzalloc(dev, sizeof(struct smsc47m192_data), GFP_KERNEL); 601 if (!data) 602 return -ENOMEM; 603 604 data->client = client; 605 data->vrm = vid_which_vrm(); 606 mutex_init(&data->update_lock); 607 608 /* Initialize the SMSC47M192 chip */ 609 smsc47m192_init_client(client); 610 611 /* sysfs hooks */ 612 data->groups[0] = &smsc47m192_group; 613 /* Pin 110 is either in4 (+12V) or VID4 */ 614 config = i2c_smbus_read_byte_data(client, SMSC47M192_REG_CONFIG); 615 if (!(config & 0x20)) 616 data->groups[1] = &smsc47m192_group_in4; 617 618 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, 619 data, data->groups); 620 return PTR_ERR_OR_ZERO(hwmon_dev); 621 } 622 623 static const struct i2c_device_id smsc47m192_id[] = { 624 { "smsc47m192", 0 }, 625 { } 626 }; 627 MODULE_DEVICE_TABLE(i2c, smsc47m192_id); 628 629 static struct i2c_driver smsc47m192_driver = { 630 .class = I2C_CLASS_HWMON, 631 .driver = { 632 .name = "smsc47m192", 633 }, 634 .probe = smsc47m192_probe, 635 .id_table = smsc47m192_id, 636 .detect = smsc47m192_detect, 637 .address_list = normal_i2c, 638 }; 639 640 module_i2c_driver(smsc47m192_driver); 641 642 MODULE_AUTHOR("Hartmut Rick <linux@rick.claranet.de>"); 643 MODULE_DESCRIPTION("SMSC47M192 driver"); 644 MODULE_LICENSE("GPL"); 645