drivers/hwmon/gl520sm.c

   1 /*
   2  * gl520sm.c - Part of lm_sensors, Linux kernel modules for hardware
   3  *             monitoring
   4  * Copyright (c) 1998, 1999  Frodo Looijaard <frodol@dds.nl>,
   5  *                           Kyösti Mälkki <kmalkki@cc.hut.fi>
   6  * Copyright (c) 2005   Maarten Deprez <maartendeprez@users.sourceforge.net>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21  *
  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/mutex.h>
  34 #include <linux/sysfs.h>
  35
  36 /* Type of the extra sensor */
  37 static unsigned short extra_sensor_type;
  38 module_param(extra_sensor_type, ushort, 0);
  39 MODULE_PARM_DESC(extra_sensor_type, "Type of extra sensor (0=autodetect, 1=temperature, 2=voltage)");
  40
  41 /* Addresses to scan */
  42 static const unsigned short normal_i2c[] = { 0x2c, 0x2d, I2C_CLIENT_END };
  43
  44 /*
  45  * Many GL520 constants specified below
  46  * One of the inputs can be configured as either temp or voltage.
  47  * That's why _TEMP2 and _IN4 access the same register
  48  */
  49
  50 /* The GL520 registers */
  51 #define GL520_REG_CHIP_ID               0x00
  52 #define GL520_REG_REVISION              0x01
  53 #define GL520_REG_CONF                  0x03
  54 #define GL520_REG_MASK                  0x11
  55
  56 #define GL520_REG_VID_INPUT             0x02
  57
  58 static const u8 GL520_REG_IN_INPUT[]    = { 0x15, 0x14, 0x13, 0x0d, 0x0e };
  59 static const u8 GL520_REG_IN_LIMIT[]    = { 0x0c, 0x09, 0x0a, 0x0b };
  60 static const u8 GL520_REG_IN_MIN[]      = { 0x0c, 0x09, 0x0a, 0x0b, 0x18 };
  61 static const u8 GL520_REG_IN_MAX[]      = { 0x0c, 0x09, 0x0a, 0x0b, 0x17 };
  62
  63 static const u8 GL520_REG_TEMP_INPUT[]          = { 0x04, 0x0e };
  64 static const u8 GL520_REG_TEMP_MAX[]            = { 0x05, 0x17 };
  65 static const u8 GL520_REG_TEMP_MAX_HYST[]       = { 0x06, 0x18 };
  66
  67 #define GL520_REG_FAN_INPUT             0x07
  68 #define GL520_REG_FAN_MIN               0x08
  69 #define GL520_REG_FAN_DIV               0x0f
  70 #define GL520_REG_FAN_OFF               GL520_REG_FAN_DIV
  71
  72 #define GL520_REG_ALARMS                0x12
  73 #define GL520_REG_BEEP_MASK             0x10
  74 #define GL520_REG_BEEP_ENABLE           GL520_REG_CONF
  75
  76 /* Client data */
  77 struct gl520_data {
  78         struct i2c_client *client;
  79         const struct attribute_group *groups[3];
  80         struct mutex update_lock;
  81         char valid;             /* zero until the following fields are valid */
  82         unsigned long last_updated;     /* in jiffies */
  83
  84         u8 vid;
  85         u8 vrm;
  86         u8 in_input[5];         /* [0] = VVD */
  87         u8 in_min[5];           /* [0] = VDD */
  88         u8 in_max[5];           /* [0] = VDD */
  89         u8 fan_input[2];
  90         u8 fan_min[2];
  91         u8 fan_div[2];
  92         u8 fan_off;
  93         u8 temp_input[2];
  94         u8 temp_max[2];
  95         u8 temp_max_hyst[2];
  96         u8 alarms;
  97         u8 beep_enable;
  98         u8 beep_mask;
  99         u8 alarm_mask;
 100         u8 two_temps;
 101 };
 102
 103 /*
 104  * Registers 0x07 to 0x0c are word-sized, others are byte-sized
 105  * GL520 uses a high-byte first convention
 106  */
 107 static int gl520_read_value(struct i2c_client *client, u8 reg)
 108 {
 109         if ((reg >= 0x07) && (reg <= 0x0c))
 110                 return i2c_smbus_read_word_swapped(client, reg);
 111         else
 112                 return i2c_smbus_read_byte_data(client, reg);
 113 }
 114
 115 static int gl520_write_value(struct i2c_client *client, u8 reg, u16 value)
 116 {
 117         if ((reg >= 0x07) && (reg <= 0x0c))
 118                 return i2c_smbus_write_word_swapped(client, reg, value);
 119         else
 120                 return i2c_smbus_write_byte_data(client, reg, value);
 121 }
 122
 123 static struct gl520_data *gl520_update_device(struct device *dev)
 124 {
 125         struct gl520_data *data = dev_get_drvdata(dev);
 126         struct i2c_client *client = data->client;
 127         int val, i;
 128
 129         mutex_lock(&data->update_lock);
 130
 131         if (time_after(jiffies, data->last_updated + 2 * HZ) || !data->valid) {
 132
 133                 dev_dbg(&client->dev, "Starting gl520sm update\n");
 134
 135                 data->alarms = gl520_read_value(client, GL520_REG_ALARMS);
 136                 data->beep_mask = gl520_read_value(client, GL520_REG_BEEP_MASK);
 137                 data->vid = gl520_read_value(client,
 138                                              GL520_REG_VID_INPUT) & 0x1f;
 139
 140                 for (i = 0; i < 4; i++) {
 141                         data->in_input[i] = gl520_read_value(client,
 142                                                         GL520_REG_IN_INPUT[i]);
 143                         val = gl520_read_value(client, GL520_REG_IN_LIMIT[i]);
 144                         data->in_min[i] = val & 0xff;
 145                         data->in_max[i] = (val >> 8) & 0xff;
 146                 }
 147
 148                 val = gl520_read_value(client, GL520_REG_FAN_INPUT);
 149                 data->fan_input[0] = (val >> 8) & 0xff;
 150                 data->fan_input[1] = val & 0xff;
 151
 152                 val = gl520_read_value(client, GL520_REG_FAN_MIN);
 153                 data->fan_min[0] = (val >> 8) & 0xff;
 154                 data->fan_min[1] = val & 0xff;
 155
 156                 data->temp_input[0] = gl520_read_value(client,
 157                                                 GL520_REG_TEMP_INPUT[0]);
 158                 data->temp_max[0] = gl520_read_value(client,
 159                                                 GL520_REG_TEMP_MAX[0]);
 160                 data->temp_max_hyst[0] = gl520_read_value(client,
 161                                                 GL520_REG_TEMP_MAX_HYST[0]);
 162
 163                 val = gl520_read_value(client, GL520_REG_FAN_DIV);
 164                 data->fan_div[0] = (val >> 6) & 0x03;
 165                 data->fan_div[1] = (val >> 4) & 0x03;
 166                 data->fan_off = (val >> 2) & 0x01;
 167
 168                 data->alarms &= data->alarm_mask;
 169
 170                 val = gl520_read_value(client, GL520_REG_CONF);
 171                 data->beep_enable = !((val >> 2) & 1);
 172
 173                 /* Temp1 and Vin4 are the same input */
 174                 if (data->two_temps) {
 175                         data->temp_input[1] = gl520_read_value(client,
 176                                                 GL520_REG_TEMP_INPUT[1]);
 177                         data->temp_max[1] = gl520_read_value(client,
 178                                                 GL520_REG_TEMP_MAX[1]);
 179                         data->temp_max_hyst[1] = gl520_read_value(client,
 180                                                 GL520_REG_TEMP_MAX_HYST[1]);
 181                 } else {
 182                         data->in_input[4] = gl520_read_value(client,
 183                                                 GL520_REG_IN_INPUT[4]);
 184                         data->in_min[4] = gl520_read_value(client,
 185                                                 GL520_REG_IN_MIN[4]);
 186                         data->in_max[4] = gl520_read_value(client,
 187                                                 GL520_REG_IN_MAX[4]);
 188                 }
 189
 190                 data->last_updated = jiffies;
 191                 data->valid = 1;
 192         }
 193
 194         mutex_unlock(&data->update_lock);
 195
 196         return data;
 197 }
 198
 199 /*
 200  * Sysfs stuff
 201  */
 202
 203 static ssize_t get_cpu_vid(struct device *dev, struct device_attribute *attr,
 204                            char *buf)
 205 {
 206         struct gl520_data *data = gl520_update_device(dev);
 207         return sprintf(buf, "%u\n", vid_from_reg(data->vid, data->vrm));
 208 }
 209 static DEVICE_ATTR(cpu0_vid, S_IRUGO, get_cpu_vid, NULL);
 210
 211 #define VDD_FROM_REG(val)       DIV_ROUND_CLOSEST((val) * 95, 4)
 212 #define VDD_CLAMP(val)          clamp_val(val, 0, 255 * 95 / 4)
 213 #define VDD_TO_REG(val)         DIV_ROUND_CLOSEST(VDD_CLAMP(val) * 4, 95)
 214
 215 #define IN_FROM_REG(val)        ((val) * 19)
 216 #define IN_CLAMP(val)           clamp_val(val, 0, 255 * 19)
 217 #define IN_TO_REG(val)          DIV_ROUND_CLOSEST(IN_CLAMP(val), 19)
 218
 219 static ssize_t get_in_input(struct device *dev, struct device_attribute *attr,
 220                             char *buf)
 221 {
 222         int n = to_sensor_dev_attr(attr)->index;
 223         struct gl520_data *data = gl520_update_device(dev);
 224         u8 r = data->in_input[n];
 225
 226         if (n == 0)
 227                 return sprintf(buf, "%d\n", VDD_FROM_REG(r));
 228         else
 229                 return sprintf(buf, "%d\n", IN_FROM_REG(r));
 230 }
 231
 232 static ssize_t get_in_min(struct device *dev, struct device_attribute *attr,
 233                           char *buf)
 234 {
 235         int n = to_sensor_dev_attr(attr)->index;
 236         struct gl520_data *data = gl520_update_device(dev);
 237         u8 r = data->in_min[n];
 238
 239         if (n == 0)
 240                 return sprintf(buf, "%d\n", VDD_FROM_REG(r));
 241         else
 242                 return sprintf(buf, "%d\n", IN_FROM_REG(r));
 243 }
 244
 245 static ssize_t get_in_max(struct device *dev, struct device_attribute *attr,
 246                           char *buf)
 247 {
 248         int n = to_sensor_dev_attr(attr)->index;
 249         struct gl520_data *data = gl520_update_device(dev);
 250         u8 r = data->in_max[n];
 251
 252         if (n == 0)
 253                 return sprintf(buf, "%d\n", VDD_FROM_REG(r));
 254         else
 255                 return sprintf(buf, "%d\n", IN_FROM_REG(r));
 256 }
 257
 258 static ssize_t set_in_min(struct device *dev, struct device_attribute *attr,
 259                           const char *buf, size_t count)
 260 {
 261         struct gl520_data *data = dev_get_drvdata(dev);
 262         struct i2c_client *client = data->client;
 263         int n = to_sensor_dev_attr(attr)->index;
 264         u8 r;
 265         long v;
 266         int err;
 267
 268         err = kstrtol(buf, 10, &v);
 269         if (err)
 270                 return err;
 271
 272         mutex_lock(&data->update_lock);
 273
 274         if (n == 0)
 275                 r = VDD_TO_REG(v);
 276         else
 277                 r = IN_TO_REG(v);
 278
 279         data->in_min[n] = r;
 280
 281         if (n < 4)
 282                 gl520_write_value(client, GL520_REG_IN_MIN[n],
 283                                   (gl520_read_value(client, GL520_REG_IN_MIN[n])
 284                                    & ~0xff) | r);
 285         else
 286                 gl520_write_value(client, GL520_REG_IN_MIN[n], r);
 287
 288         mutex_unlock(&data->update_lock);
 289         return count;
 290 }
 291
 292 static ssize_t set_in_max(struct device *dev, struct device_attribute *attr,
 293                           const char *buf, size_t count)
 294 {
 295         struct gl520_data *data = dev_get_drvdata(dev);
 296         struct i2c_client *client = data->client;
 297         int n = to_sensor_dev_attr(attr)->index;
 298         u8 r;
 299         long v;
 300         int err;
 301
 302         err = kstrtol(buf, 10, &v);
 303         if (err)
 304                 return err;
 305
 306         if (n == 0)
 307                 r = VDD_TO_REG(v);
 308         else
 309                 r = IN_TO_REG(v);
 310
 311         mutex_lock(&data->update_lock);
 312
 313         data->in_max[n] = r;
 314
 315         if (n < 4)
 316                 gl520_write_value(client, GL520_REG_IN_MAX[n],
 317                                   (gl520_read_value(client, GL520_REG_IN_MAX[n])
 318                                    & ~0xff00) | (r << 8));
 319         else
 320                 gl520_write_value(client, GL520_REG_IN_MAX[n], r);
 321
 322         mutex_unlock(&data->update_lock);
 323         return count;
 324 }
 325
 326 static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, get_in_input, NULL, 0);
 327 static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, get_in_input, NULL, 1);
 328 static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, get_in_input, NULL, 2);
 329 static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, get_in_input, NULL, 3);
 330 static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, get_in_input, NULL, 4);
 331 static SENSOR_DEVICE_ATTR(in0_min, S_IRUGO | S_IWUSR,
 332                 get_in_min, set_in_min, 0);
 333 static SENSOR_DEVICE_ATTR(in1_min, S_IRUGO | S_IWUSR,
 334                 get_in_min, set_in_min, 1);
 335 static SENSOR_DEVICE_ATTR(in2_min, S_IRUGO | S_IWUSR,
 336                 get_in_min, set_in_min, 2);
 337 static SENSOR_DEVICE_ATTR(in3_min, S_IRUGO | S_IWUSR,
 338                 get_in_min, set_in_min, 3);
 339 static SENSOR_DEVICE_ATTR(in4_min, S_IRUGO | S_IWUSR,
 340                 get_in_min, set_in_min, 4);
 341 static SENSOR_DEVICE_ATTR(in0_max, S_IRUGO | S_IWUSR,
 342                 get_in_max, set_in_max, 0);
 343 static SENSOR_DEVICE_ATTR(in1_max, S_IRUGO | S_IWUSR,
 344                 get_in_max, set_in_max, 1);
 345 static SENSOR_DEVICE_ATTR(in2_max, S_IRUGO | S_IWUSR,
 346                 get_in_max, set_in_max, 2);
 347 static SENSOR_DEVICE_ATTR(in3_max, S_IRUGO | S_IWUSR,
 348                 get_in_max, set_in_max, 3);
 349 static SENSOR_DEVICE_ATTR(in4_max, S_IRUGO | S_IWUSR,
 350                 get_in_max, set_in_max, 4);
 351
 352 #define DIV_FROM_REG(val) (1 << (val))
 353 #define FAN_FROM_REG(val, div) ((val) == 0 ? 0 : (480000 / ((val) << (div))))
 354
 355 #define FAN_BASE(div)           (480000 >> (div))
 356 #define FAN_CLAMP(val, div)     clamp_val(val, FAN_BASE(div) / 255, \
 357                                           FAN_BASE(div))
 358 #define FAN_TO_REG(val, div)    ((val) == 0 ? 0 : \
 359                                  DIV_ROUND_CLOSEST(480000, \
 360                                                 FAN_CLAMP(val, div) << (div)))
 361
 362 static ssize_t get_fan_input(struct device *dev, struct device_attribute *attr,
 363                              char *buf)
 364 {
 365         int n = to_sensor_dev_attr(attr)->index;
 366         struct gl520_data *data = gl520_update_device(dev);
 367
 368         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_input[n],
 369                                                  data->fan_div[n]));
 370 }
 371
 372 static ssize_t get_fan_min(struct device *dev, struct device_attribute *attr,
 373                            char *buf)
 374 {
 375         int n = to_sensor_dev_attr(attr)->index;
 376         struct gl520_data *data = gl520_update_device(dev);
 377
 378         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[n],
 379                                                  data->fan_div[n]));
 380 }
 381
 382 static ssize_t get_fan_div(struct device *dev, struct device_attribute *attr,
 383                            char *buf)
 384 {
 385         int n = to_sensor_dev_attr(attr)->index;
 386         struct gl520_data *data = gl520_update_device(dev);
 387
 388         return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[n]));
 389 }
 390
 391 static ssize_t get_fan_off(struct device *dev, struct device_attribute *attr,
 392                            char *buf)
 393 {
 394         struct gl520_data *data = gl520_update_device(dev);
 395         return sprintf(buf, "%d\n", data->fan_off);
 396 }
 397
 398 static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr,
 399                            const char *buf, size_t count)
 400 {
 401         struct gl520_data *data = dev_get_drvdata(dev);
 402         struct i2c_client *client = data->client;
 403         int n = to_sensor_dev_attr(attr)->index;
 404         u8 r;
 405         unsigned long v;
 406         int err;
 407
 408         err = kstrtoul(buf, 10, &v);
 409         if (err)
 410                 return err;
 411
 412         mutex_lock(&data->update_lock);
 413         r = FAN_TO_REG(v, data->fan_div[n]);
 414         data->fan_min[n] = r;
 415
 416         if (n == 0)
 417                 gl520_write_value(client, GL520_REG_FAN_MIN,
 418                                   (gl520_read_value(client, GL520_REG_FAN_MIN)
 419                                    & ~0xff00) | (r << 8));
 420         else
 421                 gl520_write_value(client, GL520_REG_FAN_MIN,
 422                                   (gl520_read_value(client, GL520_REG_FAN_MIN)
 423                                    & ~0xff) | r);
 424
 425         data->beep_mask = gl520_read_value(client, GL520_REG_BEEP_MASK);
 426         if (data->fan_min[n] == 0)
 427                 data->alarm_mask &= (n == 0) ? ~0x20 : ~0x40;
 428         else
 429                 data->alarm_mask |= (n == 0) ? 0x20 : 0x40;
 430         data->beep_mask &= data->alarm_mask;
 431         gl520_write_value(client, GL520_REG_BEEP_MASK, data->beep_mask);
 432
 433         mutex_unlock(&data->update_lock);
 434         return count;
 435 }
 436
 437 static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr,
 438                            const char *buf, size_t count)
 439 {
 440         struct gl520_data *data = dev_get_drvdata(dev);
 441         struct i2c_client *client = data->client;
 442         int n = to_sensor_dev_attr(attr)->index;
 443         u8 r;
 444         unsigned long v;
 445         int err;
 446
 447         err = kstrtoul(buf, 10, &v);
 448         if (err)
 449                 return err;
 450
 451         switch (v) {
 452         case 1:
 453                 r = 0;
 454                 break;
 455         case 2:
 456                 r = 1;
 457                 break;
 458         case 4:
 459                 r = 2;
 460                 break;
 461         case 8:
 462                 r = 3;
 463                 break;
 464         default:
 465                 dev_err(&client->dev,
 466         "fan_div value %ld not supported. Choose one of 1, 2, 4 or 8!\n", v);
 467                 return -EINVAL;
 468         }
 469
 470         mutex_lock(&data->update_lock);
 471         data->fan_div[n] = r;
 472
 473         if (n == 0)
 474                 gl520_write_value(client, GL520_REG_FAN_DIV,
 475                                   (gl520_read_value(client, GL520_REG_FAN_DIV)
 476                                    & ~0xc0) | (r << 6));
 477         else
 478                 gl520_write_value(client, GL520_REG_FAN_DIV,
 479                                   (gl520_read_value(client, GL520_REG_FAN_DIV)
 480                                    & ~0x30) | (r << 4));
 481
 482         mutex_unlock(&data->update_lock);
 483         return count;
 484 }
 485
 486 static ssize_t set_fan_off(struct device *dev, struct device_attribute *attr,
 487                            const char *buf, size_t count)
 488 {
 489         struct gl520_data *data = dev_get_drvdata(dev);
 490         struct i2c_client *client = data->client;
 491         u8 r;
 492         unsigned long v;
 493         int err;
 494
 495         err = kstrtoul(buf, 10, &v);
 496         if (err)
 497                 return err;
 498
 499         r = (v ? 1 : 0);
 500
 501         mutex_lock(&data->update_lock);
 502         data->fan_off = r;
 503         gl520_write_value(client, GL520_REG_FAN_OFF,
 504                           (gl520_read_value(client, GL520_REG_FAN_OFF)
 505                            & ~0x0c) | (r << 2));
 506         mutex_unlock(&data->update_lock);
 507         return count;
 508 }
 509
 510 static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, get_fan_input, NULL, 0);
 511 static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, get_fan_input, NULL, 1);
 512 static SENSOR_DEVICE_ATTR(fan1_min, S_IRUGO | S_IWUSR,
 513                 get_fan_min, set_fan_min, 0);
 514 static SENSOR_DEVICE_ATTR(fan2_min, S_IRUGO | S_IWUSR,
 515                 get_fan_min, set_fan_min, 1);
 516 static SENSOR_DEVICE_ATTR(fan1_div, S_IRUGO | S_IWUSR,
 517                 get_fan_div, set_fan_div, 0);
 518 static SENSOR_DEVICE_ATTR(fan2_div, S_IRUGO | S_IWUSR,
 519                 get_fan_div, set_fan_div, 1);
 520 static DEVICE_ATTR(fan1_off, S_IRUGO | S_IWUSR,
 521                 get_fan_off, set_fan_off);
 522
 523 #define TEMP_FROM_REG(val)      (((val) - 130) * 1000)
 524 #define TEMP_CLAMP(val)         clamp_val(val, -130000, 125000)
 525 #define TEMP_TO_REG(val)        (DIV_ROUND_CLOSEST(TEMP_CLAMP(val), 1000) + 130)
 526
 527 static ssize_t get_temp_input(struct device *dev, struct device_attribute *attr,
 528                               char *buf)
 529 {
 530         int n = to_sensor_dev_attr(attr)->index;
 531         struct gl520_data *data = gl520_update_device(dev);
 532
 533         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_input[n]));
 534 }
 535
 536 static ssize_t get_temp_max(struct device *dev, struct device_attribute *attr,
 537                             char *buf)
 538 {
 539         int n = to_sensor_dev_attr(attr)->index;
 540         struct gl520_data *data = gl520_update_device(dev);
 541
 542         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_max[n]));
 543 }
 544
 545 static ssize_t get_temp_max_hyst(struct device *dev,
 546                                  struct device_attribute *attr, char *buf)
 547 {
 548         int n = to_sensor_dev_attr(attr)->index;
 549         struct gl520_data *data = gl520_update_device(dev);
 550
 551         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_max_hyst[n]));
 552 }
 553
 554 static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr,
 555                             const char *buf, size_t count)
 556 {
 557         struct gl520_data *data = dev_get_drvdata(dev);
 558         struct i2c_client *client = data->client;
 559         int n = to_sensor_dev_attr(attr)->index;
 560         long v;
 561         int err;
 562
 563         err = kstrtol(buf, 10, &v);
 564         if (err)
 565                 return err;
 566
 567         mutex_lock(&data->update_lock);
 568         data->temp_max[n] = TEMP_TO_REG(v);
 569         gl520_write_value(client, GL520_REG_TEMP_MAX[n], data->temp_max[n]);
 570         mutex_unlock(&data->update_lock);
 571         return count;
 572 }
 573
 574 static ssize_t set_temp_max_hyst(struct device *dev, struct device_attribute
 575                                  *attr, const char *buf, size_t count)
 576 {
 577         struct gl520_data *data = dev_get_drvdata(dev);
 578         struct i2c_client *client = data->client;
 579         int n = to_sensor_dev_attr(attr)->index;
 580         long v;
 581         int err;
 582
 583         err = kstrtol(buf, 10, &v);
 584         if (err)
 585                 return err;
 586
 587         mutex_lock(&data->update_lock);
 588         data->temp_max_hyst[n] = TEMP_TO_REG(v);
 589         gl520_write_value(client, GL520_REG_TEMP_MAX_HYST[n],
 590                           data->temp_max_hyst[n]);
 591         mutex_unlock(&data->update_lock);
 592         return count;
 593 }
 594
 595 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, get_temp_input, NULL, 0);
 596 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, get_temp_input, NULL, 1);
 597 static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR,
 598                 get_temp_max, set_temp_max, 0);
 599 static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO | S_IWUSR,
 600                 get_temp_max, set_temp_max, 1);
 601 static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IRUGO | S_IWUSR,
 602                 get_temp_max_hyst, set_temp_max_hyst, 0);
 603 static SENSOR_DEVICE_ATTR(temp2_max_hyst, S_IRUGO | S_IWUSR,
 604                 get_temp_max_hyst, set_temp_max_hyst, 1);
 605
 606 static ssize_t get_alarms(struct device *dev, struct device_attribute *attr,
 607                           char *buf)
 608 {
 609         struct gl520_data *data = gl520_update_device(dev);
 610         return sprintf(buf, "%d\n", data->alarms);
 611 }
 612
 613 static ssize_t get_beep_enable(struct device *dev, struct device_attribute
 614                                *attr, char *buf)
 615 {
 616         struct gl520_data *data = gl520_update_device(dev);
 617         return sprintf(buf, "%d\n", data->beep_enable);
 618 }
 619
 620 static ssize_t get_beep_mask(struct device *dev, struct device_attribute *attr,
 621                              char *buf)
 622 {
 623         struct gl520_data *data = gl520_update_device(dev);
 624         return sprintf(buf, "%d\n", data->beep_mask);
 625 }
 626
 627 static ssize_t set_beep_enable(struct device *dev, struct device_attribute
 628                                *attr, const char *buf, size_t count)
 629 {
 630         struct gl520_data *data = dev_get_drvdata(dev);
 631         struct i2c_client *client = data->client;
 632         u8 r;
 633         unsigned long v;
 634         int err;
 635
 636         err = kstrtoul(buf, 10, &v);
 637         if (err)
 638                 return err;
 639
 640         r = (v ? 0 : 1);
 641
 642         mutex_lock(&data->update_lock);
 643         data->beep_enable = !r;
 644         gl520_write_value(client, GL520_REG_BEEP_ENABLE,
 645                           (gl520_read_value(client, GL520_REG_BEEP_ENABLE)
 646                            & ~0x04) | (r << 2));
 647         mutex_unlock(&data->update_lock);
 648         return count;
 649 }
 650
 651 static ssize_t set_beep_mask(struct device *dev, struct device_attribute *attr,
 652                              const char *buf, size_t count)
 653 {
 654         struct gl520_data *data = dev_get_drvdata(dev);
 655         struct i2c_client *client = data->client;
 656         unsigned long r;
 657         int err;
 658
 659         err = kstrtoul(buf, 10, &r);
 660         if (err)
 661                 return err;
 662
 663         mutex_lock(&data->update_lock);
 664         r &= data->alarm_mask;
 665         data->beep_mask = r;
 666         gl520_write_value(client, GL520_REG_BEEP_MASK, r);
 667         mutex_unlock(&data->update_lock);
 668         return count;
 669 }
 670
 671 static DEVICE_ATTR(alarms, S_IRUGO, get_alarms, NULL);
 672 static DEVICE_ATTR(beep_enable, S_IRUGO | S_IWUSR,
 673                 get_beep_enable, set_beep_enable);
 674 static DEVICE_ATTR(beep_mask, S_IRUGO | S_IWUSR,
 675                 get_beep_mask, set_beep_mask);
 676
 677 static ssize_t get_alarm(struct device *dev, struct device_attribute *attr,
 678                          char *buf)
 679 {
 680         int bit_nr = to_sensor_dev_attr(attr)->index;
 681         struct gl520_data *data = gl520_update_device(dev);
 682
 683         return sprintf(buf, "%d\n", (data->alarms >> bit_nr) & 1);
 684 }
 685
 686 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, get_alarm, NULL, 0);
 687 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, get_alarm, NULL, 1);
 688 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, get_alarm, NULL, 2);
 689 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, get_alarm, NULL, 3);
 690 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, get_alarm, NULL, 4);
 691 static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, get_alarm, NULL, 5);
 692 static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, get_alarm, NULL, 6);
 693 static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, get_alarm, NULL, 7);
 694 static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, get_alarm, NULL, 7);
 695
 696 static ssize_t get_beep(struct device *dev, struct device_attribute *attr,
 697                         char *buf)
 698 {
 699         int bitnr = to_sensor_dev_attr(attr)->index;
 700         struct gl520_data *data = gl520_update_device(dev);
 701
 702         return sprintf(buf, "%d\n", (data->beep_mask >> bitnr) & 1);
 703 }
 704
 705 static ssize_t set_beep(struct device *dev, struct device_attribute *attr,
 706                         const char *buf, size_t count)
 707 {
 708         struct gl520_data *data = dev_get_drvdata(dev);
 709         struct i2c_client *client = data->client;
 710         int bitnr = to_sensor_dev_attr(attr)->index;
 711         unsigned long bit;
 712
 713         int err;
 714
 715         err = kstrtoul(buf, 10, &bit);
 716         if (err)
 717                 return err;
 718         if (bit & ~1)
 719                 return -EINVAL;
 720
 721         mutex_lock(&data->update_lock);
 722         data->beep_mask = gl520_read_value(client, GL520_REG_BEEP_MASK);
 723         if (bit)
 724                 data->beep_mask |= (1 << bitnr);
 725         else
 726                 data->beep_mask &= ~(1 << bitnr);
 727         gl520_write_value(client, GL520_REG_BEEP_MASK, data->beep_mask);
 728         mutex_unlock(&data->update_lock);
 729         return count;
 730 }
 731
 732 static SENSOR_DEVICE_ATTR(in0_beep, S_IRUGO | S_IWUSR, get_beep, set_beep, 0);
 733 static SENSOR_DEVICE_ATTR(in1_beep, S_IRUGO | S_IWUSR, get_beep, set_beep, 1);
 734 static SENSOR_DEVICE_ATTR(in2_beep, S_IRUGO | S_IWUSR, get_beep, set_beep, 2);
 735 static SENSOR_DEVICE_ATTR(in3_beep, S_IRUGO | S_IWUSR, get_beep, set_beep, 3);
 736 static SENSOR_DEVICE_ATTR(temp1_beep, S_IRUGO | S_IWUSR, get_beep, set_beep, 4);
 737 static SENSOR_DEVICE_ATTR(fan1_beep, S_IRUGO | S_IWUSR, get_beep, set_beep, 5);
 738 static SENSOR_DEVICE_ATTR(fan2_beep, S_IRUGO | S_IWUSR, get_beep, set_beep, 6);
 739 static SENSOR_DEVICE_ATTR(temp2_beep, S_IRUGO | S_IWUSR, get_beep, set_beep, 7);
 740 static SENSOR_DEVICE_ATTR(in4_beep, S_IRUGO | S_IWUSR, get_beep, set_beep, 7);
 741
 742 static struct attribute *gl520_attributes[] = {
 743         &dev_attr_cpu0_vid.attr,
 744
 745         &sensor_dev_attr_in0_input.dev_attr.attr,
 746         &sensor_dev_attr_in0_min.dev_attr.attr,
 747         &sensor_dev_attr_in0_max.dev_attr.attr,
 748         &sensor_dev_attr_in0_alarm.dev_attr.attr,
 749         &sensor_dev_attr_in0_beep.dev_attr.attr,
 750         &sensor_dev_attr_in1_input.dev_attr.attr,
 751         &sensor_dev_attr_in1_min.dev_attr.attr,
 752         &sensor_dev_attr_in1_max.dev_attr.attr,
 753         &sensor_dev_attr_in1_alarm.dev_attr.attr,
 754         &sensor_dev_attr_in1_beep.dev_attr.attr,
 755         &sensor_dev_attr_in2_input.dev_attr.attr,
 756         &sensor_dev_attr_in2_min.dev_attr.attr,
 757         &sensor_dev_attr_in2_max.dev_attr.attr,
 758         &sensor_dev_attr_in2_alarm.dev_attr.attr,
 759         &sensor_dev_attr_in2_beep.dev_attr.attr,
 760         &sensor_dev_attr_in3_input.dev_attr.attr,
 761         &sensor_dev_attr_in3_min.dev_attr.attr,
 762         &sensor_dev_attr_in3_max.dev_attr.attr,
 763         &sensor_dev_attr_in3_alarm.dev_attr.attr,
 764         &sensor_dev_attr_in3_beep.dev_attr.attr,
 765
 766         &sensor_dev_attr_fan1_input.dev_attr.attr,
 767         &sensor_dev_attr_fan1_min.dev_attr.attr,
 768         &sensor_dev_attr_fan1_div.dev_attr.attr,
 769         &sensor_dev_attr_fan1_alarm.dev_attr.attr,
 770         &sensor_dev_attr_fan1_beep.dev_attr.attr,
 771         &dev_attr_fan1_off.attr,
 772         &sensor_dev_attr_fan2_input.dev_attr.attr,
 773         &sensor_dev_attr_fan2_min.dev_attr.attr,
 774         &sensor_dev_attr_fan2_div.dev_attr.attr,
 775         &sensor_dev_attr_fan2_alarm.dev_attr.attr,
 776         &sensor_dev_attr_fan2_beep.dev_attr.attr,
 777
 778         &sensor_dev_attr_temp1_input.dev_attr.attr,
 779         &sensor_dev_attr_temp1_max.dev_attr.attr,
 780         &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
 781         &sensor_dev_attr_temp1_alarm.dev_attr.attr,
 782         &sensor_dev_attr_temp1_beep.dev_attr.attr,
 783
 784         &dev_attr_alarms.attr,
 785         &dev_attr_beep_enable.attr,
 786         &dev_attr_beep_mask.attr,
 787         NULL
 788 };
 789
 790 static const struct attribute_group gl520_group = {
 791         .attrs = gl520_attributes,
 792 };
 793
 794 static struct attribute *gl520_attributes_in4[] = {
 795         &sensor_dev_attr_in4_input.dev_attr.attr,
 796         &sensor_dev_attr_in4_min.dev_attr.attr,
 797         &sensor_dev_attr_in4_max.dev_attr.attr,
 798         &sensor_dev_attr_in4_alarm.dev_attr.attr,
 799         &sensor_dev_attr_in4_beep.dev_attr.attr,
 800         NULL
 801 };
 802
 803 static struct attribute *gl520_attributes_temp2[] = {
 804         &sensor_dev_attr_temp2_input.dev_attr.attr,
 805         &sensor_dev_attr_temp2_max.dev_attr.attr,
 806         &sensor_dev_attr_temp2_max_hyst.dev_attr.attr,
 807         &sensor_dev_attr_temp2_alarm.dev_attr.attr,
 808         &sensor_dev_attr_temp2_beep.dev_attr.attr,
 809         NULL
 810 };
 811
 812 static const struct attribute_group gl520_group_in4 = {
 813         .attrs = gl520_attributes_in4,
 814 };
 815
 816 static const struct attribute_group gl520_group_temp2 = {
 817         .attrs = gl520_attributes_temp2,
 818 };
 819
 820
 821 /*
 822  * Real code
 823  */
 824
 825 /* Return 0 if detection is successful, -ENODEV otherwise */
 826 static int gl520_detect(struct i2c_client *client, struct i2c_board_info *info)
 827 {
 828         struct i2c_adapter *adapter = client->adapter;
 829
 830         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
 831                                      I2C_FUNC_SMBUS_WORD_DATA))
 832                 return -ENODEV;
 833
 834         /* Determine the chip type. */
 835         if ((gl520_read_value(client, GL520_REG_CHIP_ID) != 0x20) ||
 836             ((gl520_read_value(client, GL520_REG_REVISION) & 0x7f) != 0x00) ||
 837             ((gl520_read_value(client, GL520_REG_CONF) & 0x80) != 0x00)) {
 838                 dev_dbg(&client->dev, "Unknown chip type, skipping\n");
 839                 return -ENODEV;
 840         }
 841
 842         strlcpy(info->type, "gl520sm", I2C_NAME_SIZE);
 843
 844         return 0;
 845 }
 846
 847 /* Called when we have found a new GL520SM. */
 848 static void gl520_init_client(struct i2c_client *client)
 849 {
 850         struct gl520_data *data = i2c_get_clientdata(client);
 851         u8 oldconf, conf;
 852
 853         conf = oldconf = gl520_read_value(client, GL520_REG_CONF);
 854
 855         data->alarm_mask = 0xff;
 856         data->vrm = vid_which_vrm();
 857
 858         if (extra_sensor_type == 1)
 859                 conf &= ~0x10;
 860         else if (extra_sensor_type == 2)
 861                 conf |= 0x10;
 862         data->two_temps = !(conf & 0x10);
 863
 864         /* If IRQ# is disabled, we can safely force comparator mode */
 865         if (!(conf & 0x20))
 866                 conf &= 0xf7;
 867
 868         /* Enable monitoring if needed */
 869         conf |= 0x40;
 870
 871         if (conf != oldconf)
 872                 gl520_write_value(client, GL520_REG_CONF, conf);
 873
 874         gl520_update_device(&(client->dev));
 875
 876         if (data->fan_min[0] == 0)
 877                 data->alarm_mask &= ~0x20;
 878         if (data->fan_min[1] == 0)
 879                 data->alarm_mask &= ~0x40;
 880
 881         data->beep_mask &= data->alarm_mask;
 882         gl520_write_value(client, GL520_REG_BEEP_MASK, data->beep_mask);
 883 }
 884
 885 static int gl520_probe(struct i2c_client *client,
 886                        const struct i2c_device_id *id)
 887 {
 888         struct device *dev = &client->dev;
 889         struct device *hwmon_dev;
 890         struct gl520_data *data;
 891
 892         data = devm_kzalloc(dev, sizeof(struct gl520_data), GFP_KERNEL);
 893         if (!data)
 894                 return -ENOMEM;
 895
 896         i2c_set_clientdata(client, data);
 897         mutex_init(&data->update_lock);
 898         data->client = client;
 899
 900         /* Initialize the GL520SM chip */
 901         gl520_init_client(client);
 902
 903         /* sysfs hooks */
 904         data->groups[0] = &gl520_group;
 905
 906         if (data->two_temps)
 907                 data->groups[1] = &gl520_group_temp2;
 908         else
 909                 data->groups[1] = &gl520_group_in4;
 910
 911         hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
 912                                                            data, data->groups);
 913         return PTR_ERR_OR_ZERO(hwmon_dev);
 914 }
 915
 916 static const struct i2c_device_id gl520_id[] = {
 917         { "gl520sm", 0 },
 918         { }
 919 };
 920 MODULE_DEVICE_TABLE(i2c, gl520_id);
 921
 922 static struct i2c_driver gl520_driver = {
 923         .class          = I2C_CLASS_HWMON,
 924         .driver = {
 925                 .name   = "gl520sm",
 926         },
 927         .probe          = gl520_probe,
 928         .id_table       = gl520_id,
 929         .detect         = gl520_detect,
 930         .address_list   = normal_i2c,
 931 };
 932
 933 module_i2c_driver(gl520_driver);
 934
 935 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>, "
 936         "Kyösti Mälkki <kmalkki@cc.hut.fi>, "
 937         "Maarten Deprez <maartendeprez@users.sourceforge.net>");
 938 MODULE_DESCRIPTION("GL520SM driver");
 939 MODULE_LICENSE("GPL");