drivers/hwmon/adm9240.c

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This source file includes following definitions.
SCALE
IN_FROM_REG
IN_TO_REG
TEMP_TO_REG
FAN_FROM_REG
AOUT_TO_REG
AOUT_FROM_REG
adm9240_write_fan_div
adm9240_update_device
temp1_input_show
max_show
max_store
in_show
in_min_show
in_max_show
in_min_store
in_max_store
fan_show
fan_min_show
fan_div_show
fan_min_store
alarms_show
alarm_show
cpu0_vid_show
aout_output_show
aout_output_store
alarm_store
adm9240_detect
adm9240_init_client
adm9240_probe
   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * adm9240.c    Part of lm_sensors, Linux kernel modules for hardware
   4  *              monitoring
   5  *
   6  * Copyright (C) 1999   Frodo Looijaard <frodol@dds.nl>
   7  *                      Philip Edelbrock <phil@netroedge.com>
   8  * Copyright (C) 2003   Michiel Rook <michiel@grendelproject.nl>
   9  * Copyright (C) 2005   Grant Coady <gcoady.lk@gmail.com> with valuable
  10  *                              guidance from Jean Delvare
  11  *
  12  * Driver supports      Analog Devices          ADM9240
  13  *                      Dallas Semiconductor    DS1780
  14  *                      National Semiconductor  LM81
  15  *
  16  * ADM9240 is the reference, DS1780 and LM81 are register compatibles
  17  *
  18  * Voltage      Six inputs are scaled by chip, VID also reported
  19  * Temperature  Chip temperature to 0.5'C, maximum and max_hysteris
  20  * Fans         2 fans, low speed alarm, automatic fan clock divider
  21  * Alarms       16-bit map of active alarms
  22  * Analog Out   0..1250 mV output
  23  *
  24  * Chassis Intrusion: clear CI latch with 'echo 0 > intrusion0_alarm'
  25  *
  26  * Test hardware: Intel SE440BX-2 desktop motherboard --Grant
  27  *
  28  * LM81 extended temp reading not implemented
  29  */
  30 
  31 #include <linux/init.h>
  32 #include <linux/module.h>
  33 #include <linux/slab.h>
  34 #include <linux/i2c.h>
  35 #include <linux/hwmon-sysfs.h>
  36 #include <linux/hwmon.h>
  37 #include <linux/hwmon-vid.h>
  38 #include <linux/err.h>
  39 #include <linux/mutex.h>
  40 #include <linux/jiffies.h>
  41 
  42 /* Addresses to scan */
  43 static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, 0x2f,
  44                                         I2C_CLIENT_END };
  45 
  46 enum chips { adm9240, ds1780, lm81 };
  47 
  48 /* ADM9240 registers */
  49 #define ADM9240_REG_MAN_ID              0x3e
  50 #define ADM9240_REG_DIE_REV             0x3f
  51 #define ADM9240_REG_CONFIG              0x40
  52 
  53 #define ADM9240_REG_IN(nr)              (0x20 + (nr))   /* 0..5 */
  54 #define ADM9240_REG_IN_MAX(nr)          (0x2b + (nr) * 2)
  55 #define ADM9240_REG_IN_MIN(nr)          (0x2c + (nr) * 2)
  56 #define ADM9240_REG_FAN(nr)             (0x28 + (nr))   /* 0..1 */
  57 #define ADM9240_REG_FAN_MIN(nr)         (0x3b + (nr))
  58 #define ADM9240_REG_INT(nr)             (0x41 + (nr))
  59 #define ADM9240_REG_INT_MASK(nr)        (0x43 + (nr))
  60 #define ADM9240_REG_TEMP                0x27
  61 #define ADM9240_REG_TEMP_MAX(nr)        (0x39 + (nr)) /* 0, 1 = high, hyst */
  62 #define ADM9240_REG_ANALOG_OUT          0x19
  63 #define ADM9240_REG_CHASSIS_CLEAR       0x46
  64 #define ADM9240_REG_VID_FAN_DIV         0x47
  65 #define ADM9240_REG_I2C_ADDR            0x48
  66 #define ADM9240_REG_VID4                0x49
  67 #define ADM9240_REG_TEMP_CONF           0x4b
  68 
  69 /* generalised scaling with integer rounding */
  70 static inline int SCALE(long val, int mul, int div)
  71 {
  72         if (val < 0)
  73                 return (val * mul - div / 2) / div;
  74         else
  75                 return (val * mul + div / 2) / div;
  76 }
  77 
  78 /* adm9240 internally scales voltage measurements */
  79 static const u16 nom_mv[] = { 2500, 2700, 3300, 5000, 12000, 2700 };
  80 
  81 static inline unsigned int IN_FROM_REG(u8 reg, int n)
  82 {
  83         return SCALE(reg, nom_mv[n], 192);
  84 }
  85 
  86 static inline u8 IN_TO_REG(unsigned long val, int n)
  87 {
  88         val = clamp_val(val, 0, nom_mv[n] * 255 / 192);
  89         return SCALE(val, 192, nom_mv[n]);
  90 }
  91 
  92 /* temperature range: -40..125, 127 disables temperature alarm */
  93 static inline s8 TEMP_TO_REG(long val)
  94 {
  95         val = clamp_val(val, -40000, 127000);
  96         return SCALE(val, 1, 1000);
  97 }
  98 
  99 /* two fans, each with low fan speed limit */
 100 static inline unsigned int FAN_FROM_REG(u8 reg, u8 div)
 101 {
 102         if (!reg) /* error */
 103                 return -1;
 104 
 105         if (reg == 255)
 106                 return 0;
 107 
 108         return SCALE(1350000, 1, reg * div);
 109 }
 110 
 111 /* analog out 0..1250mV */
 112 static inline u8 AOUT_TO_REG(unsigned long val)
 113 {
 114         val = clamp_val(val, 0, 1250);
 115         return SCALE(val, 255, 1250);
 116 }
 117 
 118 static inline unsigned int AOUT_FROM_REG(u8 reg)
 119 {
 120         return SCALE(reg, 1250, 255);
 121 }
 122 
 123 /* per client data */
 124 struct adm9240_data {
 125         struct i2c_client *client;
 126         struct mutex update_lock;
 127         char valid;
 128         unsigned long last_updated_measure;
 129         unsigned long last_updated_config;
 130 
 131         u8 in[6];               /* ro   in0_input */
 132         u8 in_max[6];           /* rw   in0_max */
 133         u8 in_min[6];           /* rw   in0_min */
 134         u8 fan[2];              /* ro   fan1_input */
 135         u8 fan_min[2];          /* rw   fan1_min */
 136         u8 fan_div[2];          /* rw   fan1_div, read-only accessor */
 137         s16 temp;               /* ro   temp1_input, 9-bit sign-extended */
 138         s8 temp_max[2];         /* rw   0 -> temp_max, 1 -> temp_max_hyst */
 139         u16 alarms;             /* ro   alarms */
 140         u8 aout;                /* rw   aout_output */
 141         u8 vid;                 /* ro   vid */
 142         u8 vrm;                 /* --   vrm set on startup, no accessor */
 143 };
 144 
 145 /* write new fan div, callers must hold data->update_lock */
 146 static void adm9240_write_fan_div(struct i2c_client *client, int nr,
 147                 u8 fan_div)
 148 {
 149         u8 reg, old, shift = (nr + 2) * 2;
 150 
 151         reg = i2c_smbus_read_byte_data(client, ADM9240_REG_VID_FAN_DIV);
 152         old = (reg >> shift) & 3;
 153         reg &= ~(3 << shift);
 154         reg |= (fan_div << shift);
 155         i2c_smbus_write_byte_data(client, ADM9240_REG_VID_FAN_DIV, reg);
 156         dev_dbg(&client->dev,
 157                 "fan%d clock divider changed from %u to %u\n",
 158                 nr + 1, 1 << old, 1 << fan_div);
 159 }
 160 
 161 static struct adm9240_data *adm9240_update_device(struct device *dev)
 162 {
 163         struct adm9240_data *data = dev_get_drvdata(dev);
 164         struct i2c_client *client = data->client;
 165         int i;
 166 
 167         mutex_lock(&data->update_lock);
 168 
 169         /* minimum measurement cycle: 1.75 seconds */
 170         if (time_after(jiffies, data->last_updated_measure + (HZ * 7 / 4))
 171                         || !data->valid) {
 172 
 173                 for (i = 0; i < 6; i++) { /* read voltages */
 174                         data->in[i] = i2c_smbus_read_byte_data(client,
 175                                         ADM9240_REG_IN(i));
 176                 }
 177                 data->alarms = i2c_smbus_read_byte_data(client,
 178                                         ADM9240_REG_INT(0)) |
 179                                         i2c_smbus_read_byte_data(client,
 180                                         ADM9240_REG_INT(1)) << 8;
 181 
 182                 /*
 183                  * read temperature: assume temperature changes less than
 184                  * 0.5'C per two measurement cycles thus ignore possible
 185                  * but unlikely aliasing error on lsb reading. --Grant
 186                  */
 187                 data->temp = (i2c_smbus_read_byte_data(client,
 188                                         ADM9240_REG_TEMP) << 8) |
 189                                         i2c_smbus_read_byte_data(client,
 190                                         ADM9240_REG_TEMP_CONF);
 191 
 192                 for (i = 0; i < 2; i++) { /* read fans */
 193                         data->fan[i] = i2c_smbus_read_byte_data(client,
 194                                         ADM9240_REG_FAN(i));
 195 
 196                         /* adjust fan clock divider on overflow */
 197                         if (data->valid && data->fan[i] == 255 &&
 198                                         data->fan_div[i] < 3) {
 199 
 200                                 adm9240_write_fan_div(client, i,
 201                                                 ++data->fan_div[i]);
 202 
 203                                 /* adjust fan_min if active, but not to 0 */
 204                                 if (data->fan_min[i] < 255 &&
 205                                                 data->fan_min[i] >= 2)
 206                                         data->fan_min[i] /= 2;
 207                         }
 208                 }
 209                 data->last_updated_measure = jiffies;
 210         }
 211 
 212         /* minimum config reading cycle: 300 seconds */
 213         if (time_after(jiffies, data->last_updated_config + (HZ * 300))
 214                         || !data->valid) {
 215 
 216                 for (i = 0; i < 6; i++) {
 217                         data->in_min[i] = i2c_smbus_read_byte_data(client,
 218                                         ADM9240_REG_IN_MIN(i));
 219                         data->in_max[i] = i2c_smbus_read_byte_data(client,
 220                                         ADM9240_REG_IN_MAX(i));
 221                 }
 222                 for (i = 0; i < 2; i++) {
 223                         data->fan_min[i] = i2c_smbus_read_byte_data(client,
 224                                         ADM9240_REG_FAN_MIN(i));
 225                 }
 226                 data->temp_max[0] = i2c_smbus_read_byte_data(client,
 227                                 ADM9240_REG_TEMP_MAX(0));
 228                 data->temp_max[1] = i2c_smbus_read_byte_data(client,
 229                                 ADM9240_REG_TEMP_MAX(1));
 230 
 231                 /* read fan divs and 5-bit VID */
 232                 i = i2c_smbus_read_byte_data(client, ADM9240_REG_VID_FAN_DIV);
 233                 data->fan_div[0] = (i >> 4) & 3;
 234                 data->fan_div[1] = (i >> 6) & 3;
 235                 data->vid = i & 0x0f;
 236                 data->vid |= (i2c_smbus_read_byte_data(client,
 237                                         ADM9240_REG_VID4) & 1) << 4;
 238                 /* read analog out */
 239                 data->aout = i2c_smbus_read_byte_data(client,
 240                                 ADM9240_REG_ANALOG_OUT);
 241 
 242                 data->last_updated_config = jiffies;
 243                 data->valid = 1;
 244         }
 245         mutex_unlock(&data->update_lock);
 246         return data;
 247 }
 248 
 249 /*** sysfs accessors ***/
 250 
 251 /* temperature */
 252 static ssize_t temp1_input_show(struct device *dev,
 253                                 struct device_attribute *dummy, char *buf)
 254 {
 255         struct adm9240_data *data = adm9240_update_device(dev);
 256         return sprintf(buf, "%d\n", data->temp / 128 * 500); /* 9-bit value */
 257 }
 258 
 259 static ssize_t max_show(struct device *dev, struct device_attribute *devattr,
 260                         char *buf)
 261 {
 262         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 263         struct adm9240_data *data = adm9240_update_device(dev);
 264         return sprintf(buf, "%d\n", data->temp_max[attr->index] * 1000);
 265 }
 266 
 267 static ssize_t max_store(struct device *dev, struct device_attribute *devattr,
 268                          const char *buf, size_t count)
 269 {
 270         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 271         struct adm9240_data *data = dev_get_drvdata(dev);
 272         struct i2c_client *client = data->client;
 273         long val;
 274         int err;
 275 
 276         err = kstrtol(buf, 10, &val);
 277         if (err)
 278                 return err;
 279 
 280         mutex_lock(&data->update_lock);
 281         data->temp_max[attr->index] = TEMP_TO_REG(val);
 282         i2c_smbus_write_byte_data(client, ADM9240_REG_TEMP_MAX(attr->index),
 283                         data->temp_max[attr->index]);
 284         mutex_unlock(&data->update_lock);
 285         return count;
 286 }
 287 
 288 static DEVICE_ATTR_RO(temp1_input);
 289 static SENSOR_DEVICE_ATTR_RW(temp1_max, max, 0);
 290 static SENSOR_DEVICE_ATTR_RW(temp1_max_hyst, max, 1);
 291 
 292 /* voltage */
 293 static ssize_t in_show(struct device *dev, struct device_attribute *devattr,
 294                        char *buf)
 295 {
 296         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 297         struct adm9240_data *data = adm9240_update_device(dev);
 298         return sprintf(buf, "%d\n", IN_FROM_REG(data->in[attr->index],
 299                                 attr->index));
 300 }
 301 
 302 static ssize_t in_min_show(struct device *dev,
 303                            struct device_attribute *devattr, char *buf)
 304 {
 305         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 306         struct adm9240_data *data = adm9240_update_device(dev);
 307         return sprintf(buf, "%d\n", IN_FROM_REG(data->in_min[attr->index],
 308                                 attr->index));
 309 }
 310 
 311 static ssize_t in_max_show(struct device *dev,
 312                            struct device_attribute *devattr, char *buf)
 313 {
 314         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 315         struct adm9240_data *data = adm9240_update_device(dev);
 316         return sprintf(buf, "%d\n", IN_FROM_REG(data->in_max[attr->index],
 317                                 attr->index));
 318 }
 319 
 320 static ssize_t in_min_store(struct device *dev,
 321                             struct device_attribute *devattr, const char *buf,
 322                             size_t count)
 323 {
 324         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 325         struct adm9240_data *data = dev_get_drvdata(dev);
 326         struct i2c_client *client = data->client;
 327         unsigned long val;
 328         int err;
 329 
 330         err = kstrtoul(buf, 10, &val);
 331         if (err)
 332                 return err;
 333 
 334         mutex_lock(&data->update_lock);
 335         data->in_min[attr->index] = IN_TO_REG(val, attr->index);
 336         i2c_smbus_write_byte_data(client, ADM9240_REG_IN_MIN(attr->index),
 337                         data->in_min[attr->index]);
 338         mutex_unlock(&data->update_lock);
 339         return count;
 340 }
 341 
 342 static ssize_t in_max_store(struct device *dev,
 343                             struct device_attribute *devattr, const char *buf,
 344                             size_t count)
 345 {
 346         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 347         struct adm9240_data *data = dev_get_drvdata(dev);
 348         struct i2c_client *client = data->client;
 349         unsigned long val;
 350         int err;
 351 
 352         err = kstrtoul(buf, 10, &val);
 353         if (err)
 354                 return err;
 355 
 356         mutex_lock(&data->update_lock);
 357         data->in_max[attr->index] = IN_TO_REG(val, attr->index);
 358         i2c_smbus_write_byte_data(client, ADM9240_REG_IN_MAX(attr->index),
 359                         data->in_max[attr->index]);
 360         mutex_unlock(&data->update_lock);
 361         return count;
 362 }
 363 
 364 static SENSOR_DEVICE_ATTR_RO(in0_input, in, 0);
 365 static SENSOR_DEVICE_ATTR_RW(in0_min, in_min, 0);
 366 static SENSOR_DEVICE_ATTR_RW(in0_max, in_max, 0);
 367 static SENSOR_DEVICE_ATTR_RO(in1_input, in, 1);
 368 static SENSOR_DEVICE_ATTR_RW(in1_min, in_min, 1);
 369 static SENSOR_DEVICE_ATTR_RW(in1_max, in_max, 1);
 370 static SENSOR_DEVICE_ATTR_RO(in2_input, in, 2);
 371 static SENSOR_DEVICE_ATTR_RW(in2_min, in_min, 2);
 372 static SENSOR_DEVICE_ATTR_RW(in2_max, in_max, 2);
 373 static SENSOR_DEVICE_ATTR_RO(in3_input, in, 3);
 374 static SENSOR_DEVICE_ATTR_RW(in3_min, in_min, 3);
 375 static SENSOR_DEVICE_ATTR_RW(in3_max, in_max, 3);
 376 static SENSOR_DEVICE_ATTR_RO(in4_input, in, 4);
 377 static SENSOR_DEVICE_ATTR_RW(in4_min, in_min, 4);
 378 static SENSOR_DEVICE_ATTR_RW(in4_max, in_max, 4);
 379 static SENSOR_DEVICE_ATTR_RO(in5_input, in, 5);
 380 static SENSOR_DEVICE_ATTR_RW(in5_min, in_min, 5);
 381 static SENSOR_DEVICE_ATTR_RW(in5_max, in_max, 5);
 382 
 383 /* fans */
 384 static ssize_t fan_show(struct device *dev, struct device_attribute *devattr,
 385                         char *buf)
 386 {
 387         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 388         struct adm9240_data *data = adm9240_update_device(dev);
 389         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[attr->index],
 390                                 1 << data->fan_div[attr->index]));
 391 }
 392 
 393 static ssize_t fan_min_show(struct device *dev,
 394                             struct device_attribute *devattr, char *buf)
 395 {
 396         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 397         struct adm9240_data *data = adm9240_update_device(dev);
 398         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[attr->index],
 399                                 1 << data->fan_div[attr->index]));
 400 }
 401 
 402 static ssize_t fan_div_show(struct device *dev,
 403                             struct device_attribute *devattr, char *buf)
 404 {
 405         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 406         struct adm9240_data *data = adm9240_update_device(dev);
 407         return sprintf(buf, "%d\n", 1 << data->fan_div[attr->index]);
 408 }
 409 
 410 /*
 411  * set fan speed low limit:
 412  *
 413  * - value is zero: disable fan speed low limit alarm
 414  *
 415  * - value is below fan speed measurement range: enable fan speed low
 416  *   limit alarm to be asserted while fan speed too slow to measure
 417  *
 418  * - otherwise: select fan clock divider to suit fan speed low limit,
 419  *   measurement code may adjust registers to ensure fan speed reading
 420  */
 421 static ssize_t fan_min_store(struct device *dev,
 422                              struct device_attribute *devattr,
 423                              const char *buf, size_t count)
 424 {
 425         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 426         struct adm9240_data *data = dev_get_drvdata(dev);
 427         struct i2c_client *client = data->client;
 428         int nr = attr->index;
 429         u8 new_div;
 430         unsigned long val;
 431         int err;
 432 
 433         err = kstrtoul(buf, 10, &val);
 434         if (err)
 435                 return err;
 436 
 437         mutex_lock(&data->update_lock);
 438 
 439         if (!val) {
 440                 data->fan_min[nr] = 255;
 441                 new_div = data->fan_div[nr];
 442 
 443                 dev_dbg(&client->dev, "fan%u low limit set disabled\n",
 444                                 nr + 1);
 445 
 446         } else if (val < 1350000 / (8 * 254)) {
 447                 new_div = 3;
 448                 data->fan_min[nr] = 254;
 449 
 450                 dev_dbg(&client->dev, "fan%u low limit set minimum %u\n",
 451                                 nr + 1, FAN_FROM_REG(254, 1 << new_div));
 452 
 453         } else {
 454                 unsigned int new_min = 1350000 / val;
 455 
 456                 new_div = 0;
 457                 while (new_min > 192 && new_div < 3) {
 458                         new_div++;
 459                         new_min /= 2;
 460                 }
 461                 if (!new_min) /* keep > 0 */
 462                         new_min++;
 463 
 464                 data->fan_min[nr] = new_min;
 465 
 466                 dev_dbg(&client->dev, "fan%u low limit set fan speed %u\n",
 467                                 nr + 1, FAN_FROM_REG(new_min, 1 << new_div));
 468         }
 469 
 470         if (new_div != data->fan_div[nr]) {
 471                 data->fan_div[nr] = new_div;
 472                 adm9240_write_fan_div(client, nr, new_div);
 473         }
 474         i2c_smbus_write_byte_data(client, ADM9240_REG_FAN_MIN(nr),
 475                         data->fan_min[nr]);
 476 
 477         mutex_unlock(&data->update_lock);
 478         return count;
 479 }
 480 
 481 static SENSOR_DEVICE_ATTR_RO(fan1_input, fan, 0);
 482 static SENSOR_DEVICE_ATTR_RW(fan1_min, fan_min, 0);
 483 static SENSOR_DEVICE_ATTR_RO(fan1_div, fan_div, 0);
 484 static SENSOR_DEVICE_ATTR_RO(fan2_input, fan, 1);
 485 static SENSOR_DEVICE_ATTR_RW(fan2_min, fan_min, 1);
 486 static SENSOR_DEVICE_ATTR_RO(fan2_div, fan_div, 1);
 487 
 488 /* alarms */
 489 static ssize_t alarms_show(struct device *dev,
 490                 struct device_attribute *attr, char *buf)
 491 {
 492         struct adm9240_data *data = adm9240_update_device(dev);
 493         return sprintf(buf, "%u\n", data->alarms);
 494 }
 495 static DEVICE_ATTR_RO(alarms);
 496 
 497 static ssize_t alarm_show(struct device *dev, struct device_attribute *attr,
 498                           char *buf)
 499 {
 500         int bitnr = to_sensor_dev_attr(attr)->index;
 501         struct adm9240_data *data = adm9240_update_device(dev);
 502         return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
 503 }
 504 static SENSOR_DEVICE_ATTR_RO(in0_alarm, alarm, 0);
 505 static SENSOR_DEVICE_ATTR_RO(in1_alarm, alarm, 1);
 506 static SENSOR_DEVICE_ATTR_RO(in2_alarm, alarm, 2);
 507 static SENSOR_DEVICE_ATTR_RO(in3_alarm, alarm, 3);
 508 static SENSOR_DEVICE_ATTR_RO(in4_alarm, alarm, 8);
 509 static SENSOR_DEVICE_ATTR_RO(in5_alarm, alarm, 9);
 510 static SENSOR_DEVICE_ATTR_RO(temp1_alarm, alarm, 4);
 511 static SENSOR_DEVICE_ATTR_RO(fan1_alarm, alarm, 6);
 512 static SENSOR_DEVICE_ATTR_RO(fan2_alarm, alarm, 7);
 513 
 514 /* vid */
 515 static ssize_t cpu0_vid_show(struct device *dev,
 516                              struct device_attribute *attr, char *buf)
 517 {
 518         struct adm9240_data *data = adm9240_update_device(dev);
 519         return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
 520 }
 521 static DEVICE_ATTR_RO(cpu0_vid);
 522 
 523 /* analog output */
 524 static ssize_t aout_output_show(struct device *dev,
 525                                 struct device_attribute *attr, char *buf)
 526 {
 527         struct adm9240_data *data = adm9240_update_device(dev);
 528         return sprintf(buf, "%d\n", AOUT_FROM_REG(data->aout));
 529 }
 530 
 531 static ssize_t aout_output_store(struct device *dev,
 532                                  struct device_attribute *attr,
 533                                  const char *buf, size_t count)
 534 {
 535         struct adm9240_data *data = dev_get_drvdata(dev);
 536         struct i2c_client *client = data->client;
 537         long val;
 538         int err;
 539 
 540         err = kstrtol(buf, 10, &val);
 541         if (err)
 542                 return err;
 543 
 544         mutex_lock(&data->update_lock);
 545         data->aout = AOUT_TO_REG(val);
 546         i2c_smbus_write_byte_data(client, ADM9240_REG_ANALOG_OUT, data->aout);
 547         mutex_unlock(&data->update_lock);
 548         return count;
 549 }
 550 static DEVICE_ATTR_RW(aout_output);
 551 
 552 static ssize_t alarm_store(struct device *dev, struct device_attribute *attr,
 553                            const char *buf, size_t count)
 554 {
 555         struct adm9240_data *data = dev_get_drvdata(dev);
 556         struct i2c_client *client = data->client;
 557         unsigned long val;
 558 
 559         if (kstrtoul(buf, 10, &val) || val != 0)
 560                 return -EINVAL;
 561 
 562         mutex_lock(&data->update_lock);
 563         i2c_smbus_write_byte_data(client, ADM9240_REG_CHASSIS_CLEAR, 0x80);
 564         data->valid = 0;                /* Force cache refresh */
 565         mutex_unlock(&data->update_lock);
 566         dev_dbg(&client->dev, "chassis intrusion latch cleared\n");
 567 
 568         return count;
 569 }
 570 static SENSOR_DEVICE_ATTR_RW(intrusion0_alarm, alarm, 12);
 571 
 572 static struct attribute *adm9240_attrs[] = {
 573         &sensor_dev_attr_in0_input.dev_attr.attr,
 574         &sensor_dev_attr_in0_min.dev_attr.attr,
 575         &sensor_dev_attr_in0_max.dev_attr.attr,
 576         &sensor_dev_attr_in0_alarm.dev_attr.attr,
 577         &sensor_dev_attr_in1_input.dev_attr.attr,
 578         &sensor_dev_attr_in1_min.dev_attr.attr,
 579         &sensor_dev_attr_in1_max.dev_attr.attr,
 580         &sensor_dev_attr_in1_alarm.dev_attr.attr,
 581         &sensor_dev_attr_in2_input.dev_attr.attr,
 582         &sensor_dev_attr_in2_min.dev_attr.attr,
 583         &sensor_dev_attr_in2_max.dev_attr.attr,
 584         &sensor_dev_attr_in2_alarm.dev_attr.attr,
 585         &sensor_dev_attr_in3_input.dev_attr.attr,
 586         &sensor_dev_attr_in3_min.dev_attr.attr,
 587         &sensor_dev_attr_in3_max.dev_attr.attr,
 588         &sensor_dev_attr_in3_alarm.dev_attr.attr,
 589         &sensor_dev_attr_in4_input.dev_attr.attr,
 590         &sensor_dev_attr_in4_min.dev_attr.attr,
 591         &sensor_dev_attr_in4_max.dev_attr.attr,
 592         &sensor_dev_attr_in4_alarm.dev_attr.attr,
 593         &sensor_dev_attr_in5_input.dev_attr.attr,
 594         &sensor_dev_attr_in5_min.dev_attr.attr,
 595         &sensor_dev_attr_in5_max.dev_attr.attr,
 596         &sensor_dev_attr_in5_alarm.dev_attr.attr,
 597         &dev_attr_temp1_input.attr,
 598         &sensor_dev_attr_temp1_max.dev_attr.attr,
 599         &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
 600         &sensor_dev_attr_temp1_alarm.dev_attr.attr,
 601         &sensor_dev_attr_fan1_input.dev_attr.attr,
 602         &sensor_dev_attr_fan1_div.dev_attr.attr,
 603         &sensor_dev_attr_fan1_min.dev_attr.attr,
 604         &sensor_dev_attr_fan1_alarm.dev_attr.attr,
 605         &sensor_dev_attr_fan2_input.dev_attr.attr,
 606         &sensor_dev_attr_fan2_div.dev_attr.attr,
 607         &sensor_dev_attr_fan2_min.dev_attr.attr,
 608         &sensor_dev_attr_fan2_alarm.dev_attr.attr,
 609         &dev_attr_alarms.attr,
 610         &dev_attr_aout_output.attr,
 611         &sensor_dev_attr_intrusion0_alarm.dev_attr.attr,
 612         &dev_attr_cpu0_vid.attr,
 613         NULL
 614 };
 615 
 616 ATTRIBUTE_GROUPS(adm9240);
 617 
 618 /*** sensor chip detect and driver install ***/
 619 
 620 /* Return 0 if detection is successful, -ENODEV otherwise */
 621 static int adm9240_detect(struct i2c_client *new_client,
 622                           struct i2c_board_info *info)
 623 {
 624         struct i2c_adapter *adapter = new_client->adapter;
 625         const char *name = "";
 626         int address = new_client->addr;
 627         u8 man_id, die_rev;
 628 
 629         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 630                 return -ENODEV;
 631 
 632         /* verify chip: reg address should match i2c address */
 633         if (i2c_smbus_read_byte_data(new_client, ADM9240_REG_I2C_ADDR)
 634                         != address) {
 635                 dev_err(&adapter->dev, "detect fail: address match, 0x%02x\n",
 636                         address);
 637                 return -ENODEV;
 638         }
 639 
 640         /* check known chip manufacturer */
 641         man_id = i2c_smbus_read_byte_data(new_client, ADM9240_REG_MAN_ID);
 642         if (man_id == 0x23) {
 643                 name = "adm9240";
 644         } else if (man_id == 0xda) {
 645                 name = "ds1780";
 646         } else if (man_id == 0x01) {
 647                 name = "lm81";
 648         } else {
 649                 dev_err(&adapter->dev, "detect fail: unknown manuf, 0x%02x\n",
 650                         man_id);
 651                 return -ENODEV;
 652         }
 653 
 654         /* successful detect, print chip info */
 655         die_rev = i2c_smbus_read_byte_data(new_client, ADM9240_REG_DIE_REV);
 656         dev_info(&adapter->dev, "found %s revision %u\n",
 657                  man_id == 0x23 ? "ADM9240" :
 658                  man_id == 0xda ? "DS1780" : "LM81", die_rev);
 659 
 660         strlcpy(info->type, name, I2C_NAME_SIZE);
 661 
 662         return 0;
 663 }
 664 
 665 static void adm9240_init_client(struct i2c_client *client)
 666 {
 667         struct adm9240_data *data = i2c_get_clientdata(client);
 668         u8 conf = i2c_smbus_read_byte_data(client, ADM9240_REG_CONFIG);
 669         u8 mode = i2c_smbus_read_byte_data(client, ADM9240_REG_TEMP_CONF) & 3;
 670 
 671         data->vrm = vid_which_vrm(); /* need this to report vid as mV */
 672 
 673         dev_info(&client->dev, "Using VRM: %d.%d\n", data->vrm / 10,
 674                         data->vrm % 10);
 675 
 676         if (conf & 1) { /* measurement cycle running: report state */
 677 
 678                 dev_info(&client->dev, "status: config 0x%02x mode %u\n",
 679                                 conf, mode);
 680 
 681         } else { /* cold start: open limits before starting chip */
 682                 int i;
 683 
 684                 for (i = 0; i < 6; i++) {
 685                         i2c_smbus_write_byte_data(client,
 686                                         ADM9240_REG_IN_MIN(i), 0);
 687                         i2c_smbus_write_byte_data(client,
 688                                         ADM9240_REG_IN_MAX(i), 255);
 689                 }
 690                 i2c_smbus_write_byte_data(client,
 691                                 ADM9240_REG_FAN_MIN(0), 255);
 692                 i2c_smbus_write_byte_data(client,
 693                                 ADM9240_REG_FAN_MIN(1), 255);
 694                 i2c_smbus_write_byte_data(client,
 695                                 ADM9240_REG_TEMP_MAX(0), 127);
 696                 i2c_smbus_write_byte_data(client,
 697                                 ADM9240_REG_TEMP_MAX(1), 127);
 698 
 699                 /* start measurement cycle */
 700                 i2c_smbus_write_byte_data(client, ADM9240_REG_CONFIG, 1);
 701 
 702                 dev_info(&client->dev,
 703                          "cold start: config was 0x%02x mode %u\n", conf, mode);
 704         }
 705 }
 706 
 707 static int adm9240_probe(struct i2c_client *new_client,
 708                          const struct i2c_device_id *id)
 709 {
 710         struct device *dev = &new_client->dev;
 711         struct device *hwmon_dev;
 712         struct adm9240_data *data;
 713 
 714         data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
 715         if (!data)
 716                 return -ENOMEM;
 717 
 718         i2c_set_clientdata(new_client, data);
 719         data->client = new_client;
 720         mutex_init(&data->update_lock);
 721 
 722         adm9240_init_client(new_client);
 723 
 724         hwmon_dev = devm_hwmon_device_register_with_groups(dev,
 725                                                            new_client->name,
 726                                                            data,
 727                                                            adm9240_groups);
 728         return PTR_ERR_OR_ZERO(hwmon_dev);
 729 }
 730 
 731 static const struct i2c_device_id adm9240_id[] = {
 732         { "adm9240", adm9240 },
 733         { "ds1780", ds1780 },
 734         { "lm81", lm81 },
 735         { }
 736 };
 737 MODULE_DEVICE_TABLE(i2c, adm9240_id);
 738 
 739 static struct i2c_driver adm9240_driver = {
 740         .class          = I2C_CLASS_HWMON,
 741         .driver = {
 742                 .name   = "adm9240",
 743         },
 744         .probe          = adm9240_probe,
 745         .id_table       = adm9240_id,
 746         .detect         = adm9240_detect,
 747         .address_list   = normal_i2c,
 748 };
 749 
 750 module_i2c_driver(adm9240_driver);
 751 
 752 MODULE_AUTHOR("Michiel Rook <michiel@grendelproject.nl>, "
 753                 "Grant Coady <gcoady.lk@gmail.com> and others");
 754 MODULE_DESCRIPTION("ADM9240/DS1780/LM81 driver");
 755 MODULE_LICENSE("GPL");
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/hwmon/adm9240.c

DEFINITIONS
