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 show_in(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 show_in_min(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 show_in_max(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 set_in_min(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 set_in_max(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 #define show_in_offset(offset) \ 254 static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO, \ 255 show_in, NULL, offset); \ 256 static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \ 257 show_in_min, set_in_min, offset); \ 258 static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \ 259 show_in_max, set_in_max, offset); 260 261 show_in_offset(0) 262 show_in_offset(1) 263 show_in_offset(2) 264 show_in_offset(3) 265 show_in_offset(4) 266 show_in_offset(5) 267 show_in_offset(6) 268 show_in_offset(7) 269 270 /* Temperatures */ 271 static ssize_t show_temp(struct device *dev, struct device_attribute *attr, 272 char *buf) 273 { 274 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); 275 int nr = sensor_attr->index; 276 struct smsc47m192_data *data = smsc47m192_update_device(dev); 277 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr])); 278 } 279 280 static ssize_t show_temp_min(struct device *dev, struct device_attribute *attr, 281 char *buf) 282 { 283 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); 284 int nr = sensor_attr->index; 285 struct smsc47m192_data *data = smsc47m192_update_device(dev); 286 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_min[nr])); 287 } 288 289 static ssize_t show_temp_max(struct device *dev, struct device_attribute *attr, 290 char *buf) 291 { 292 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); 293 int nr = sensor_attr->index; 294 struct smsc47m192_data *data = smsc47m192_update_device(dev); 295 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_max[nr])); 296 } 297 298 static ssize_t set_temp_min(struct device *dev, struct device_attribute *attr, 299 const char *buf, size_t count) 300 { 301 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); 302 int nr = sensor_attr->index; 303 struct smsc47m192_data *data = dev_get_drvdata(dev); 304 struct i2c_client *client = data->client; 305 long val; 306 int err; 307 308 err = kstrtol(buf, 10, &val); 309 if (err) 310 return err; 311 312 mutex_lock(&data->update_lock); 313 data->temp_min[nr] = TEMP_TO_REG(val); 314 i2c_smbus_write_byte_data(client, SMSC47M192_REG_TEMP_MIN[nr], 315 data->temp_min[nr]); 316 mutex_unlock(&data->update_lock); 317 return count; 318 } 319 320 static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr, 321 const char *buf, size_t count) 322 { 323 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); 324 int nr = sensor_attr->index; 325 struct smsc47m192_data *data = dev_get_drvdata(dev); 326 struct i2c_client *client = data->client; 327 long val; 328 int err; 329 330 err = kstrtol(buf, 10, &val); 331 if (err) 332 return err; 333 334 mutex_lock(&data->update_lock); 335 data->temp_max[nr] = TEMP_TO_REG(val); 336 i2c_smbus_write_byte_data(client, SMSC47M192_REG_TEMP_MAX[nr], 337 data->temp_max[nr]); 338 mutex_unlock(&data->update_lock); 339 return count; 340 } 341 342 static ssize_t show_temp_offset(struct device *dev, struct device_attribute 343 *attr, char *buf) 344 { 345 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); 346 int nr = sensor_attr->index; 347 struct smsc47m192_data *data = smsc47m192_update_device(dev); 348 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_offset[nr])); 349 } 350 351 static ssize_t set_temp_offset(struct device *dev, struct device_attribute 352 *attr, const char *buf, size_t count) 353 { 354 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); 355 int nr = sensor_attr->index; 356 struct smsc47m192_data *data = dev_get_drvdata(dev); 357 struct i2c_client *client = data->client; 358 u8 sfr = i2c_smbus_read_byte_data(client, SMSC47M192_REG_SFR); 359 long val; 360 int err; 361 362 err = kstrtol(buf, 10, &val); 363 if (err) 364 return err; 365 366 mutex_lock(&data->update_lock); 367 data->temp_offset[nr] = TEMP_TO_REG(val); 368 if (nr > 1) 369 i2c_smbus_write_byte_data(client, 370 SMSC47M192_REG_TEMP_OFFSET(nr), data->temp_offset[nr]); 371 else if (data->temp_offset[nr] != 0) { 372 /* 373 * offset[0] and offset[1] share the same register, 374 * SFR bit 4 activates offset[0] 375 */ 376 i2c_smbus_write_byte_data(client, SMSC47M192_REG_SFR, 377 (sfr & 0xef) | (nr == 0 ? 0x10 : 0)); 378 data->temp_offset[1-nr] = 0; 379 i2c_smbus_write_byte_data(client, 380 SMSC47M192_REG_TEMP_OFFSET(nr), data->temp_offset[nr]); 381 } else if ((sfr & 0x10) == (nr == 0 ? 0x10 : 0)) 382 i2c_smbus_write_byte_data(client, 383 SMSC47M192_REG_TEMP_OFFSET(nr), 0); 384 mutex_unlock(&data->update_lock); 385 return count; 386 } 387 388 #define show_temp_index(index) \ 389 static SENSOR_DEVICE_ATTR(temp##index##_input, S_IRUGO, \ 390 show_temp, NULL, index-1); \ 391 static SENSOR_DEVICE_ATTR(temp##index##_min, S_IRUGO | S_IWUSR, \ 392 show_temp_min, set_temp_min, index-1); \ 393 static SENSOR_DEVICE_ATTR(temp##index##_max, S_IRUGO | S_IWUSR, \ 394 show_temp_max, set_temp_max, index-1); \ 395 static SENSOR_DEVICE_ATTR(temp##index##_offset, S_IRUGO | S_IWUSR, \ 396 show_temp_offset, set_temp_offset, index-1); 397 398 show_temp_index(1) 399 show_temp_index(2) 400 show_temp_index(3) 401 402 /* VID */ 403 static ssize_t cpu0_vid_show(struct device *dev, 404 struct device_attribute *attr, char *buf) 405 { 406 struct smsc47m192_data *data = smsc47m192_update_device(dev); 407 return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm)); 408 } 409 static DEVICE_ATTR_RO(cpu0_vid); 410 411 static ssize_t vrm_show(struct device *dev, struct device_attribute *attr, 412 char *buf) 413 { 414 struct smsc47m192_data *data = dev_get_drvdata(dev); 415 return sprintf(buf, "%d\n", data->vrm); 416 } 417 418 static ssize_t vrm_store(struct device *dev, struct device_attribute *attr, 419 const char *buf, size_t count) 420 { 421 struct smsc47m192_data *data = dev_get_drvdata(dev); 422 unsigned long val; 423 int err; 424 425 err = kstrtoul(buf, 10, &val); 426 if (err) 427 return err; 428 if (val > 255) 429 return -EINVAL; 430 431 data->vrm = val; 432 return count; 433 } 434 static DEVICE_ATTR_RW(vrm); 435 436 /* Alarms */ 437 static ssize_t show_alarm(struct device *dev, struct device_attribute *attr, 438 char *buf) 439 { 440 struct sensor_device_attribute *sensor_attr = to_sensor_dev_attr(attr); 441 int nr = sensor_attr->index; 442 struct smsc47m192_data *data = smsc47m192_update_device(dev); 443 return sprintf(buf, "%u\n", (data->alarms & nr) ? 1 : 0); 444 } 445 446 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 0x0010); 447 static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 0x0020); 448 static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 0x0040); 449 static SENSOR_DEVICE_ATTR(temp2_fault, S_IRUGO, show_alarm, NULL, 0x4000); 450 static SENSOR_DEVICE_ATTR(temp3_fault, S_IRUGO, show_alarm, NULL, 0x8000); 451 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0x0001); 452 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 0x0002); 453 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 0x0004); 454 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 0x0008); 455 static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 0x0100); 456 static SENSOR_DEVICE_ATTR(in5_alarm, S_IRUGO, show_alarm, NULL, 0x0200); 457 static SENSOR_DEVICE_ATTR(in6_alarm, S_IRUGO, show_alarm, NULL, 0x0400); 458 static SENSOR_DEVICE_ATTR(in7_alarm, S_IRUGO, show_alarm, NULL, 0x0800); 459 460 static struct attribute *smsc47m192_attributes[] = { 461 &sensor_dev_attr_in0_input.dev_attr.attr, 462 &sensor_dev_attr_in0_min.dev_attr.attr, 463 &sensor_dev_attr_in0_max.dev_attr.attr, 464 &sensor_dev_attr_in0_alarm.dev_attr.attr, 465 &sensor_dev_attr_in1_input.dev_attr.attr, 466 &sensor_dev_attr_in1_min.dev_attr.attr, 467 &sensor_dev_attr_in1_max.dev_attr.attr, 468 &sensor_dev_attr_in1_alarm.dev_attr.attr, 469 &sensor_dev_attr_in2_input.dev_attr.attr, 470 &sensor_dev_attr_in2_min.dev_attr.attr, 471 &sensor_dev_attr_in2_max.dev_attr.attr, 472 &sensor_dev_attr_in2_alarm.dev_attr.attr, 473 &sensor_dev_attr_in3_input.dev_attr.attr, 474 &sensor_dev_attr_in3_min.dev_attr.attr, 475 &sensor_dev_attr_in3_max.dev_attr.attr, 476 &sensor_dev_attr_in3_alarm.dev_attr.attr, 477 &sensor_dev_attr_in5_input.dev_attr.attr, 478 &sensor_dev_attr_in5_min.dev_attr.attr, 479 &sensor_dev_attr_in5_max.dev_attr.attr, 480 &sensor_dev_attr_in5_alarm.dev_attr.attr, 481 &sensor_dev_attr_in6_input.dev_attr.attr, 482 &sensor_dev_attr_in6_min.dev_attr.attr, 483 &sensor_dev_attr_in6_max.dev_attr.attr, 484 &sensor_dev_attr_in6_alarm.dev_attr.attr, 485 &sensor_dev_attr_in7_input.dev_attr.attr, 486 &sensor_dev_attr_in7_min.dev_attr.attr, 487 &sensor_dev_attr_in7_max.dev_attr.attr, 488 &sensor_dev_attr_in7_alarm.dev_attr.attr, 489 490 &sensor_dev_attr_temp1_input.dev_attr.attr, 491 &sensor_dev_attr_temp1_max.dev_attr.attr, 492 &sensor_dev_attr_temp1_min.dev_attr.attr, 493 &sensor_dev_attr_temp1_offset.dev_attr.attr, 494 &sensor_dev_attr_temp1_alarm.dev_attr.attr, 495 &sensor_dev_attr_temp2_input.dev_attr.attr, 496 &sensor_dev_attr_temp2_max.dev_attr.attr, 497 &sensor_dev_attr_temp2_min.dev_attr.attr, 498 &sensor_dev_attr_temp2_offset.dev_attr.attr, 499 &sensor_dev_attr_temp2_alarm.dev_attr.attr, 500 &sensor_dev_attr_temp2_fault.dev_attr.attr, 501 &sensor_dev_attr_temp3_input.dev_attr.attr, 502 &sensor_dev_attr_temp3_max.dev_attr.attr, 503 &sensor_dev_attr_temp3_min.dev_attr.attr, 504 &sensor_dev_attr_temp3_offset.dev_attr.attr, 505 &sensor_dev_attr_temp3_alarm.dev_attr.attr, 506 &sensor_dev_attr_temp3_fault.dev_attr.attr, 507 508 &dev_attr_cpu0_vid.attr, 509 &dev_attr_vrm.attr, 510 NULL 511 }; 512 513 static const struct attribute_group smsc47m192_group = { 514 .attrs = smsc47m192_attributes, 515 }; 516 517 static struct attribute *smsc47m192_attributes_in4[] = { 518 &sensor_dev_attr_in4_input.dev_attr.attr, 519 &sensor_dev_attr_in4_min.dev_attr.attr, 520 &sensor_dev_attr_in4_max.dev_attr.attr, 521 &sensor_dev_attr_in4_alarm.dev_attr.attr, 522 NULL 523 }; 524 525 static const struct attribute_group smsc47m192_group_in4 = { 526 .attrs = smsc47m192_attributes_in4, 527 }; 528 529 static void smsc47m192_init_client(struct i2c_client *client) 530 { 531 int i; 532 u8 config = i2c_smbus_read_byte_data(client, SMSC47M192_REG_CONFIG); 533 u8 sfr = i2c_smbus_read_byte_data(client, SMSC47M192_REG_SFR); 534 535 /* select cycle mode (pause 1 sec between updates) */ 536 i2c_smbus_write_byte_data(client, SMSC47M192_REG_SFR, 537 (sfr & 0xfd) | 0x02); 538 if (!(config & 0x01)) { 539 /* initialize alarm limits */ 540 for (i = 0; i < 8; i++) { 541 i2c_smbus_write_byte_data(client, 542 SMSC47M192_REG_IN_MIN(i), 0); 543 i2c_smbus_write_byte_data(client, 544 SMSC47M192_REG_IN_MAX(i), 0xff); 545 } 546 for (i = 0; i < 3; i++) { 547 i2c_smbus_write_byte_data(client, 548 SMSC47M192_REG_TEMP_MIN[i], 0x80); 549 i2c_smbus_write_byte_data(client, 550 SMSC47M192_REG_TEMP_MAX[i], 0x7f); 551 } 552 553 /* start monitoring */ 554 i2c_smbus_write_byte_data(client, SMSC47M192_REG_CONFIG, 555 (config & 0xf7) | 0x01); 556 } 557 } 558 559 /* Return 0 if detection is successful, -ENODEV otherwise */ 560 static int smsc47m192_detect(struct i2c_client *client, 561 struct i2c_board_info *info) 562 { 563 struct i2c_adapter *adapter = client->adapter; 564 int version; 565 566 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 567 return -ENODEV; 568 569 /* Detection criteria from sensors_detect script */ 570 version = i2c_smbus_read_byte_data(client, SMSC47M192_REG_VERSION); 571 if (i2c_smbus_read_byte_data(client, 572 SMSC47M192_REG_COMPANY_ID) == 0x55 573 && (version & 0xf0) == 0x20 574 && (i2c_smbus_read_byte_data(client, 575 SMSC47M192_REG_VID) & 0x70) == 0x00 576 && (i2c_smbus_read_byte_data(client, 577 SMSC47M192_REG_VID4) & 0xfe) == 0x80) { 578 dev_info(&adapter->dev, 579 "found SMSC47M192 or compatible, " 580 "version 2, stepping A%d\n", version & 0x0f); 581 } else { 582 dev_dbg(&adapter->dev, 583 "SMSC47M192 detection failed at 0x%02x\n", 584 client->addr); 585 return -ENODEV; 586 } 587 588 strlcpy(info->type, "smsc47m192", I2C_NAME_SIZE); 589 590 return 0; 591 } 592 593 static int smsc47m192_probe(struct i2c_client *client, 594 const struct i2c_device_id *id) 595 { 596 struct device *dev = &client->dev; 597 struct device *hwmon_dev; 598 struct smsc47m192_data *data; 599 int config; 600 601 data = devm_kzalloc(dev, sizeof(struct smsc47m192_data), GFP_KERNEL); 602 if (!data) 603 return -ENOMEM; 604 605 data->client = client; 606 data->vrm = vid_which_vrm(); 607 mutex_init(&data->update_lock); 608 609 /* Initialize the SMSC47M192 chip */ 610 smsc47m192_init_client(client); 611 612 /* sysfs hooks */ 613 data->groups[0] = &smsc47m192_group; 614 /* Pin 110 is either in4 (+12V) or VID4 */ 615 config = i2c_smbus_read_byte_data(client, SMSC47M192_REG_CONFIG); 616 if (!(config & 0x20)) 617 data->groups[1] = &smsc47m192_group_in4; 618 619 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, 620 data, data->groups); 621 return PTR_ERR_OR_ZERO(hwmon_dev); 622 } 623 624 static const struct i2c_device_id smsc47m192_id[] = { 625 { "smsc47m192", 0 }, 626 { } 627 }; 628 MODULE_DEVICE_TABLE(i2c, smsc47m192_id); 629 630 static struct i2c_driver smsc47m192_driver = { 631 .class = I2C_CLASS_HWMON, 632 .driver = { 633 .name = "smsc47m192", 634 }, 635 .probe = smsc47m192_probe, 636 .id_table = smsc47m192_id, 637 .detect = smsc47m192_detect, 638 .address_list = normal_i2c, 639 }; 640 641 module_i2c_driver(smsc47m192_driver); 642 643 MODULE_AUTHOR("Hartmut Rick <linux@rick.claranet.de>"); 644 MODULE_DESCRIPTION("SMSC47M192 driver"); 645 MODULE_LICENSE("GPL"); 646