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) (((val) * 95 + 2) / 4)
 212 #define VDD_TO_REG(val) clamp_val((((val) * 4 + 47) / 95), 0, 255)
 213
 214 #define IN_FROM_REG(val) ((val) * 19)
 215 #define IN_TO_REG(val) clamp_val((((val) + 9) / 19), 0, 255)
 216
 217 static ssize_t get_in_input(struct device *dev, struct device_attribute *attr,
 218                             char *buf)
 219 {
 220         int n = to_sensor_dev_attr(attr)->index;
 221         struct gl520_data *data = gl520_update_device(dev);
 222         u8 r = data->in_input[n];
 223
 224         if (n == 0)
 225                 return sprintf(buf, "%d\n", VDD_FROM_REG(r));
 226         else
 227                 return sprintf(buf, "%d\n", IN_FROM_REG(r));
 228 }
 229
 230 static ssize_t get_in_min(struct device *dev, struct device_attribute *attr,
 231                           char *buf)
 232 {
 233         int n = to_sensor_dev_attr(attr)->index;
 234         struct gl520_data *data = gl520_update_device(dev);
 235         u8 r = data->in_min[n];
 236
 237         if (n == 0)
 238                 return sprintf(buf, "%d\n", VDD_FROM_REG(r));
 239         else
 240                 return sprintf(buf, "%d\n", IN_FROM_REG(r));
 241 }
 242
 243 static ssize_t get_in_max(struct device *dev, struct device_attribute *attr,
 244                           char *buf)
 245 {
 246         int n = to_sensor_dev_attr(attr)->index;
 247         struct gl520_data *data = gl520_update_device(dev);
 248         u8 r = data->in_max[n];
 249
 250         if (n == 0)
 251                 return sprintf(buf, "%d\n", VDD_FROM_REG(r));
 252         else
 253                 return sprintf(buf, "%d\n", IN_FROM_REG(r));
 254 }
 255
 256 static ssize_t set_in_min(struct device *dev, struct device_attribute *attr,
 257                           const char *buf, size_t count)
 258 {
 259         struct gl520_data *data = dev_get_drvdata(dev);
 260         struct i2c_client *client = data->client;
 261         int n = to_sensor_dev_attr(attr)->index;
 262         u8 r;
 263         long v;
 264         int err;
 265
 266         err = kstrtol(buf, 10, &v);
 267         if (err)
 268                 return err;
 269
 270         mutex_lock(&data->update_lock);
 271
 272         if (n == 0)
 273                 r = VDD_TO_REG(v);
 274         else
 275                 r = IN_TO_REG(v);
 276
 277         data->in_min[n] = r;
 278
 279         if (n < 4)
 280                 gl520_write_value(client, GL520_REG_IN_MIN[n],
 281                                   (gl520_read_value(client, GL520_REG_IN_MIN[n])
 282                                    & ~0xff) | r);
 283         else
 284                 gl520_write_value(client, GL520_REG_IN_MIN[n], r);
 285
 286         mutex_unlock(&data->update_lock);
 287         return count;
 288 }
 289
 290 static ssize_t set_in_max(struct device *dev, struct device_attribute *attr,
 291                           const char *buf, size_t count)
 292 {
 293         struct gl520_data *data = dev_get_drvdata(dev);
 294         struct i2c_client *client = data->client;
 295         int n = to_sensor_dev_attr(attr)->index;
 296         u8 r;
 297         long v;
 298         int err;
 299
 300         err = kstrtol(buf, 10, &v);
 301         if (err)
 302                 return err;
 303
 304         if (n == 0)
 305                 r = VDD_TO_REG(v);
 306         else
 307                 r = IN_TO_REG(v);
 308
 309         mutex_lock(&data->update_lock);
 310
 311         data->in_max[n] = r;
 312
 313         if (n < 4)
 314                 gl520_write_value(client, GL520_REG_IN_MAX[n],
 315                                   (gl520_read_value(client, GL520_REG_IN_MAX[n])
 316                                    & ~0xff00) | (r << 8));
 317         else
 318                 gl520_write_value(client, GL520_REG_IN_MAX[n], r);
 319
 320         mutex_unlock(&data->update_lock);
 321         return count;
 322 }
 323
 324 static SENSOR_DEVICE_ATTR(in0_input, S_IRUGO, get_in_input, NULL, 0);
 325 static SENSOR_DEVICE_ATTR(in1_input, S_IRUGO, get_in_input, NULL, 1);
 326 static SENSOR_DEVICE_ATTR(in2_input, S_IRUGO, get_in_input, NULL, 2);
 327 static SENSOR_DEVICE_ATTR(in3_input, S_IRUGO, get_in_input, NULL, 3);
 328 static SENSOR_DEVICE_ATTR(in4_input, S_IRUGO, get_in_input, NULL, 4);
 329 static SENSOR_DEVICE_ATTR(in0_min, S_IRUGO | S_IWUSR,
 330                 get_in_min, set_in_min, 0);
 331 static SENSOR_DEVICE_ATTR(in1_min, S_IRUGO | S_IWUSR,
 332                 get_in_min, set_in_min, 1);
 333 static SENSOR_DEVICE_ATTR(in2_min, S_IRUGO | S_IWUSR,
 334                 get_in_min, set_in_min, 2);
 335 static SENSOR_DEVICE_ATTR(in3_min, S_IRUGO | S_IWUSR,
 336                 get_in_min, set_in_min, 3);
 337 static SENSOR_DEVICE_ATTR(in4_min, S_IRUGO | S_IWUSR,
 338                 get_in_min, set_in_min, 4);
 339 static SENSOR_DEVICE_ATTR(in0_max, S_IRUGO | S_IWUSR,
 340                 get_in_max, set_in_max, 0);
 341 static SENSOR_DEVICE_ATTR(in1_max, S_IRUGO | S_IWUSR,
 342                 get_in_max, set_in_max, 1);
 343 static SENSOR_DEVICE_ATTR(in2_max, S_IRUGO | S_IWUSR,
 344                 get_in_max, set_in_max, 2);
 345 static SENSOR_DEVICE_ATTR(in3_max, S_IRUGO | S_IWUSR,
 346                 get_in_max, set_in_max, 3);
 347 static SENSOR_DEVICE_ATTR(in4_max, S_IRUGO | S_IWUSR,
 348                 get_in_max, set_in_max, 4);
 349
 350 #define DIV_FROM_REG(val) (1 << (val))
 351 #define FAN_FROM_REG(val, div) ((val) == 0 ? 0 : (480000 / ((val) << (div))))
 352 #define FAN_TO_REG(val, div) ((val) <= 0 ? 0 : \
 353         clamp_val((480000 + ((val) << ((div)-1))) / ((val) << (div)), 1, 255))
 354
 355 static ssize_t get_fan_input(struct device *dev, struct device_attribute *attr,
 356                              char *buf)
 357 {
 358         int n = to_sensor_dev_attr(attr)->index;
 359         struct gl520_data *data = gl520_update_device(dev);
 360
 361         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_input[n],
 362                                                  data->fan_div[n]));
 363 }
 364
 365 static ssize_t get_fan_min(struct device *dev, struct device_attribute *attr,
 366                            char *buf)
 367 {
 368         int n = to_sensor_dev_attr(attr)->index;
 369         struct gl520_data *data = gl520_update_device(dev);
 370
 371         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[n],
 372                                                  data->fan_div[n]));
 373 }
 374
 375 static ssize_t get_fan_div(struct device *dev, struct device_attribute *attr,
 376                            char *buf)
 377 {
 378         int n = to_sensor_dev_attr(attr)->index;
 379         struct gl520_data *data = gl520_update_device(dev);
 380
 381         return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[n]));
 382 }
 383
 384 static ssize_t get_fan_off(struct device *dev, struct device_attribute *attr,
 385                            char *buf)
 386 {
 387         struct gl520_data *data = gl520_update_device(dev);
 388         return sprintf(buf, "%d\n", data->fan_off);
 389 }
 390
 391 static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr,
 392                            const char *buf, size_t count)
 393 {
 394         struct gl520_data *data = dev_get_drvdata(dev);
 395         struct i2c_client *client = data->client;
 396         int n = to_sensor_dev_attr(attr)->index;
 397         u8 r;
 398         unsigned long v;
 399         int err;
 400
 401         err = kstrtoul(buf, 10, &v);
 402         if (err)
 403                 return err;
 404
 405         mutex_lock(&data->update_lock);
 406         r = FAN_TO_REG(v, data->fan_div[n]);
 407         data->fan_min[n] = r;
 408
 409         if (n == 0)
 410                 gl520_write_value(client, GL520_REG_FAN_MIN,
 411                                   (gl520_read_value(client, GL520_REG_FAN_MIN)
 412                                    & ~0xff00) | (r << 8));
 413         else
 414                 gl520_write_value(client, GL520_REG_FAN_MIN,
 415                                   (gl520_read_value(client, GL520_REG_FAN_MIN)
 416                                    & ~0xff) | r);
 417
 418         data->beep_mask = gl520_read_value(client, GL520_REG_BEEP_MASK);
 419         if (data->fan_min[n] == 0)
 420                 data->alarm_mask &= (n == 0) ? ~0x20 : ~0x40;
 421         else
 422                 data->alarm_mask |= (n == 0) ? 0x20 : 0x40;
 423         data->beep_mask &= data->alarm_mask;
 424         gl520_write_value(client, GL520_REG_BEEP_MASK, data->beep_mask);
 425
 426         mutex_unlock(&data->update_lock);
 427         return count;
 428 }
 429
 430 static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr,
 431                            const char *buf, size_t count)
 432 {
 433         struct gl520_data *data = dev_get_drvdata(dev);
 434         struct i2c_client *client = data->client;
 435         int n = to_sensor_dev_attr(attr)->index;
 436         u8 r;
 437         unsigned long v;
 438         int err;
 439
 440         err = kstrtoul(buf, 10, &v);
 441         if (err)
 442                 return err;
 443
 444         switch (v) {
 445         case 1:
 446                 r = 0;
 447                 break;
 448         case 2:
 449                 r = 1;
 450                 break;
 451         case 4:
 452                 r = 2;
 453                 break;
 454         case 8:
 455                 r = 3;
 456                 break;
 457         default:
 458                 dev_err(&client->dev,
 459         "fan_div value %ld not supported. Choose one of 1, 2, 4 or 8!\n", v);
 460                 return -EINVAL;
 461         }
 462
 463         mutex_lock(&data->update_lock);
 464         data->fan_div[n] = r;
 465
 466         if (n == 0)
 467                 gl520_write_value(client, GL520_REG_FAN_DIV,
 468                                   (gl520_read_value(client, GL520_REG_FAN_DIV)
 469                                    & ~0xc0) | (r << 6));
 470         else
 471                 gl520_write_value(client, GL520_REG_FAN_DIV,
 472                                   (gl520_read_value(client, GL520_REG_FAN_DIV)
 473                                    & ~0x30) | (r << 4));
 474
 475         mutex_unlock(&data->update_lock);
 476         return count;
 477 }
 478
 479 static ssize_t set_fan_off(struct device *dev, struct device_attribute *attr,
 480                            const char *buf, size_t count)
 481 {
 482         struct gl520_data *data = dev_get_drvdata(dev);
 483         struct i2c_client *client = data->client;
 484         u8 r;
 485         unsigned long v;
 486         int err;
 487
 488         err = kstrtoul(buf, 10, &v);
 489         if (err)
 490                 return err;
 491
 492         r = (v ? 1 : 0);
 493
 494         mutex_lock(&data->update_lock);
 495         data->fan_off = r;
 496         gl520_write_value(client, GL520_REG_FAN_OFF,
 497                           (gl520_read_value(client, GL520_REG_FAN_OFF)
 498                            & ~0x0c) | (r << 2));
 499         mutex_unlock(&data->update_lock);
 500         return count;
 501 }
 502
 503 static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, get_fan_input, NULL, 0);
 504 static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, get_fan_input, NULL, 1);
 505 static SENSOR_DEVICE_ATTR(fan1_min, S_IRUGO | S_IWUSR,
 506                 get_fan_min, set_fan_min, 0);
 507 static SENSOR_DEVICE_ATTR(fan2_min, S_IRUGO | S_IWUSR,
 508                 get_fan_min, set_fan_min, 1);
 509 static SENSOR_DEVICE_ATTR(fan1_div, S_IRUGO | S_IWUSR,
 510                 get_fan_div, set_fan_div, 0);
 511 static SENSOR_DEVICE_ATTR(fan2_div, S_IRUGO | S_IWUSR,
 512                 get_fan_div, set_fan_div, 1);
 513 static DEVICE_ATTR(fan1_off, S_IRUGO | S_IWUSR,
 514                 get_fan_off, set_fan_off);
 515
 516 #define TEMP_FROM_REG(val) (((val) - 130) * 1000)
 517 #define TEMP_TO_REG(val) clamp_val(((((val) < 0 ? \
 518                         (val) - 500 : (val) + 500) / 1000) + 130), 0, 255)
 519
 520 static ssize_t get_temp_input(struct device *dev, struct device_attribute *attr,
 521                               char *buf)
 522 {
 523         int n = to_sensor_dev_attr(attr)->index;
 524         struct gl520_data *data = gl520_update_device(dev);
 525
 526         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_input[n]));
 527 }
 528
 529 static ssize_t get_temp_max(struct device *dev, struct device_attribute *attr,
 530                             char *buf)
 531 {
 532         int n = to_sensor_dev_attr(attr)->index;
 533         struct gl520_data *data = gl520_update_device(dev);
 534
 535         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_max[n]));
 536 }
 537
 538 static ssize_t get_temp_max_hyst(struct device *dev,
 539                                  struct device_attribute *attr, char *buf)
 540 {
 541         int n = to_sensor_dev_attr(attr)->index;
 542         struct gl520_data *data = gl520_update_device(dev);
 543
 544         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_max_hyst[n]));
 545 }
 546
 547 static ssize_t set_temp_max(struct device *dev, struct device_attribute *attr,
 548                             const char *buf, size_t count)
 549 {
 550         struct gl520_data *data = dev_get_drvdata(dev);
 551         struct i2c_client *client = data->client;
 552         int n = to_sensor_dev_attr(attr)->index;
 553         long v;
 554         int err;
 555
 556         err = kstrtol(buf, 10, &v);
 557         if (err)
 558                 return err;
 559
 560         mutex_lock(&data->update_lock);
 561         data->temp_max[n] = TEMP_TO_REG(v);
 562         gl520_write_value(client, GL520_REG_TEMP_MAX[n], data->temp_max[n]);
 563         mutex_unlock(&data->update_lock);
 564         return count;
 565 }
 566
 567 static ssize_t set_temp_max_hyst(struct device *dev, struct device_attribute
 568                                  *attr, const char *buf, size_t count)
 569 {
 570         struct gl520_data *data = dev_get_drvdata(dev);
 571         struct i2c_client *client = data->client;
 572         int n = to_sensor_dev_attr(attr)->index;
 573         long v;
 574         int err;
 575
 576         err = kstrtol(buf, 10, &v);
 577         if (err)
 578                 return err;
 579
 580         mutex_lock(&data->update_lock);
 581         data->temp_max_hyst[n] = TEMP_TO_REG(v);
 582         gl520_write_value(client, GL520_REG_TEMP_MAX_HYST[n],
 583                           data->temp_max_hyst[n]);
 584         mutex_unlock(&data->update_lock);
 585         return count;
 586 }
 587
 588 static SENSOR_DEVICE_ATTR(temp1_input, S_IRUGO, get_temp_input, NULL, 0);
 589 static SENSOR_DEVICE_ATTR(temp2_input, S_IRUGO, get_temp_input, NULL, 1);
 590 static SENSOR_DEVICE_ATTR(temp1_max, S_IRUGO | S_IWUSR,
 591                 get_temp_max, set_temp_max, 0);
 592 static SENSOR_DEVICE_ATTR(temp2_max, S_IRUGO | S_IWUSR,
 593                 get_temp_max, set_temp_max, 1);
 594 static SENSOR_DEVICE_ATTR(temp1_max_hyst, S_IRUGO | S_IWUSR,
 595                 get_temp_max_hyst, set_temp_max_hyst, 0);
 596 static SENSOR_DEVICE_ATTR(temp2_max_hyst, S_IRUGO | S_IWUSR,
 597                 get_temp_max_hyst, set_temp_max_hyst, 1);
 598
 599 static ssize_t get_alarms(struct device *dev, struct device_attribute *attr,
 600                           char *buf)
 601 {
 602         struct gl520_data *data = gl520_update_device(dev);
 603         return sprintf(buf, "%d\n", data->alarms);
 604 }
 605
 606 static ssize_t get_beep_enable(struct device *dev, struct device_attribute
 607                                *attr, char *buf)
 608 {
 609         struct gl520_data *data = gl520_update_device(dev);
 610         return sprintf(buf, "%d\n", data->beep_enable);
 611 }
 612
 613 static ssize_t get_beep_mask(struct device *dev, struct device_attribute *attr,
 614                              char *buf)
 615 {
 616         struct gl520_data *data = gl520_update_device(dev);
 617         return sprintf(buf, "%d\n", data->beep_mask);
 618 }
 619
 620 static ssize_t set_beep_enable(struct device *dev, struct device_attribute
 621                                *attr, const char *buf, size_t count)
 622 {
 623         struct gl520_data *data = dev_get_drvdata(dev);
 624         struct i2c_client *client = data->client;
 625         u8 r;
 626         unsigned long v;
 627         int err;
 628
 629         err = kstrtoul(buf, 10, &v);
 630         if (err)
 631                 return err;
 632
 633         r = (v ? 0 : 1);
 634
 635         mutex_lock(&data->update_lock);
 636         data->beep_enable = !r;
 637         gl520_write_value(client, GL520_REG_BEEP_ENABLE,
 638                           (gl520_read_value(client, GL520_REG_BEEP_ENABLE)
 639                            & ~0x04) | (r << 2));
 640         mutex_unlock(&data->update_lock);
 641         return count;
 642 }
 643
 644 static ssize_t set_beep_mask(struct device *dev, struct device_attribute *attr,
 645                              const char *buf, size_t count)
 646 {
 647         struct gl520_data *data = dev_get_drvdata(dev);
 648         struct i2c_client *client = data->client;
 649         unsigned long r;
 650         int err;
 651
 652         err = kstrtoul(buf, 10, &r);
 653         if (err)
 654                 return err;
 655
 656         mutex_lock(&data->update_lock);
 657         r &= data->alarm_mask;
 658         data->beep_mask = r;
 659         gl520_write_value(client, GL520_REG_BEEP_MASK, r);
 660         mutex_unlock(&data->update_lock);
 661         return count;
 662 }
 663
 664 static DEVICE_ATTR(alarms, S_IRUGO, get_alarms, NULL);
 665 static DEVICE_ATTR(beep_enable, S_IRUGO | S_IWUSR,
 666                 get_beep_enable, set_beep_enable);
 667 static DEVICE_ATTR(beep_mask, S_IRUGO | S_IWUSR,
 668                 get_beep_mask, set_beep_mask);
 669
 670 static ssize_t get_alarm(struct device *dev, struct device_attribute *attr,
 671                          char *buf)
 672 {
 673         int bit_nr = to_sensor_dev_attr(attr)->index;
 674         struct gl520_data *data = gl520_update_device(dev);
 675
 676         return sprintf(buf, "%d\n", (data->alarms >> bit_nr) & 1);
 677 }
 678
 679 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, get_alarm, NULL, 0);
 680 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, get_alarm, NULL, 1);
 681 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, get_alarm, NULL, 2);
 682 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, get_alarm, NULL, 3);
 683 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, get_alarm, NULL, 4);
 684 static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, get_alarm, NULL, 5);
 685 static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, get_alarm, NULL, 6);
 686 static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, get_alarm, NULL, 7);
 687 static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, get_alarm, NULL, 7);
 688
 689 static ssize_t get_beep(struct device *dev, struct device_attribute *attr,
 690                         char *buf)
 691 {
 692         int bitnr = to_sensor_dev_attr(attr)->index;
 693         struct gl520_data *data = gl520_update_device(dev);
 694
 695         return sprintf(buf, "%d\n", (data->beep_mask >> bitnr) & 1);
 696 }
 697
 698 static ssize_t set_beep(struct device *dev, struct device_attribute *attr,
 699                         const char *buf, size_t count)
 700 {
 701         struct gl520_data *data = dev_get_drvdata(dev);
 702         struct i2c_client *client = data->client;
 703         int bitnr = to_sensor_dev_attr(attr)->index;
 704         unsigned long bit;
 705
 706         int err;
 707
 708         err = kstrtoul(buf, 10, &bit);
 709         if (err)
 710                 return err;
 711         if (bit & ~1)
 712                 return -EINVAL;
 713
 714         mutex_lock(&data->update_lock);
 715         data->beep_mask = gl520_read_value(client, GL520_REG_BEEP_MASK);
 716         if (bit)
 717                 data->beep_mask |= (1 << bitnr);
 718         else
 719                 data->beep_mask &= ~(1 << bitnr);
 720         gl520_write_value(client, GL520_REG_BEEP_MASK, data->beep_mask);
 721         mutex_unlock(&data->update_lock);
 722         return count;
 723 }
 724
 725 static SENSOR_DEVICE_ATTR(in0_beep, S_IRUGO | S_IWUSR, get_beep, set_beep, 0);
 726 static SENSOR_DEVICE_ATTR(in1_beep, S_IRUGO | S_IWUSR, get_beep, set_beep, 1);
 727 static SENSOR_DEVICE_ATTR(in2_beep, S_IRUGO | S_IWUSR, get_beep, set_beep, 2);
 728 static SENSOR_DEVICE_ATTR(in3_beep, S_IRUGO | S_IWUSR, get_beep, set_beep, 3);
 729 static SENSOR_DEVICE_ATTR(temp1_beep, S_IRUGO | S_IWUSR, get_beep, set_beep, 4);
 730 static SENSOR_DEVICE_ATTR(fan1_beep, S_IRUGO | S_IWUSR, get_beep, set_beep, 5);
 731 static SENSOR_DEVICE_ATTR(fan2_beep, S_IRUGO | S_IWUSR, get_beep, set_beep, 6);
 732 static SENSOR_DEVICE_ATTR(temp2_beep, S_IRUGO | S_IWUSR, get_beep, set_beep, 7);
 733 static SENSOR_DEVICE_ATTR(in4_beep, S_IRUGO | S_IWUSR, get_beep, set_beep, 7);
 734
 735 static struct attribute *gl520_attributes[] = {
 736         &dev_attr_cpu0_vid.attr,
 737
 738         &sensor_dev_attr_in0_input.dev_attr.attr,
 739         &sensor_dev_attr_in0_min.dev_attr.attr,
 740         &sensor_dev_attr_in0_max.dev_attr.attr,
 741         &sensor_dev_attr_in0_alarm.dev_attr.attr,
 742         &sensor_dev_attr_in0_beep.dev_attr.attr,
 743         &sensor_dev_attr_in1_input.dev_attr.attr,
 744         &sensor_dev_attr_in1_min.dev_attr.attr,
 745         &sensor_dev_attr_in1_max.dev_attr.attr,
 746         &sensor_dev_attr_in1_alarm.dev_attr.attr,
 747         &sensor_dev_attr_in1_beep.dev_attr.attr,
 748         &sensor_dev_attr_in2_input.dev_attr.attr,
 749         &sensor_dev_attr_in2_min.dev_attr.attr,
 750         &sensor_dev_attr_in2_max.dev_attr.attr,
 751         &sensor_dev_attr_in2_alarm.dev_attr.attr,
 752         &sensor_dev_attr_in2_beep.dev_attr.attr,
 753         &sensor_dev_attr_in3_input.dev_attr.attr,
 754         &sensor_dev_attr_in3_min.dev_attr.attr,
 755         &sensor_dev_attr_in3_max.dev_attr.attr,
 756         &sensor_dev_attr_in3_alarm.dev_attr.attr,
 757         &sensor_dev_attr_in3_beep.dev_attr.attr,
 758
 759         &sensor_dev_attr_fan1_input.dev_attr.attr,
 760         &sensor_dev_attr_fan1_min.dev_attr.attr,
 761         &sensor_dev_attr_fan1_div.dev_attr.attr,
 762         &sensor_dev_attr_fan1_alarm.dev_attr.attr,
 763         &sensor_dev_attr_fan1_beep.dev_attr.attr,
 764         &dev_attr_fan1_off.attr,
 765         &sensor_dev_attr_fan2_input.dev_attr.attr,
 766         &sensor_dev_attr_fan2_min.dev_attr.attr,
 767         &sensor_dev_attr_fan2_div.dev_attr.attr,
 768         &sensor_dev_attr_fan2_alarm.dev_attr.attr,
 769         &sensor_dev_attr_fan2_beep.dev_attr.attr,
 770
 771         &sensor_dev_attr_temp1_input.dev_attr.attr,
 772         &sensor_dev_attr_temp1_max.dev_attr.attr,
 773         &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
 774         &sensor_dev_attr_temp1_alarm.dev_attr.attr,
 775         &sensor_dev_attr_temp1_beep.dev_attr.attr,
 776
 777         &dev_attr_alarms.attr,
 778         &dev_attr_beep_enable.attr,
 779         &dev_attr_beep_mask.attr,
 780         NULL
 781 };
 782
 783 static const struct attribute_group gl520_group = {
 784         .attrs = gl520_attributes,
 785 };
 786
 787 static struct attribute *gl520_attributes_in4[] = {
 788         &sensor_dev_attr_in4_input.dev_attr.attr,
 789         &sensor_dev_attr_in4_min.dev_attr.attr,
 790         &sensor_dev_attr_in4_max.dev_attr.attr,
 791         &sensor_dev_attr_in4_alarm.dev_attr.attr,
 792         &sensor_dev_attr_in4_beep.dev_attr.attr,
 793         NULL
 794 };
 795
 796 static struct attribute *gl520_attributes_temp2[] = {
 797         &sensor_dev_attr_temp2_input.dev_attr.attr,
 798         &sensor_dev_attr_temp2_max.dev_attr.attr,
 799         &sensor_dev_attr_temp2_max_hyst.dev_attr.attr,
 800         &sensor_dev_attr_temp2_alarm.dev_attr.attr,
 801         &sensor_dev_attr_temp2_beep.dev_attr.attr,
 802         NULL
 803 };
 804
 805 static const struct attribute_group gl520_group_in4 = {
 806         .attrs = gl520_attributes_in4,
 807 };
 808
 809 static const struct attribute_group gl520_group_temp2 = {
 810         .attrs = gl520_attributes_temp2,
 811 };
 812
 813
 814 /*
 815  * Real code
 816  */
 817
 818 /* Return 0 if detection is successful, -ENODEV otherwise */
 819 static int gl520_detect(struct i2c_client *client, struct i2c_board_info *info)
 820 {
 821         struct i2c_adapter *adapter = client->adapter;
 822
 823         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
 824                                      I2C_FUNC_SMBUS_WORD_DATA))
 825                 return -ENODEV;
 826
 827         /* Determine the chip type. */
 828         if ((gl520_read_value(client, GL520_REG_CHIP_ID) != 0x20) ||
 829             ((gl520_read_value(client, GL520_REG_REVISION) & 0x7f) != 0x00) ||
 830             ((gl520_read_value(client, GL520_REG_CONF) & 0x80) != 0x00)) {
 831                 dev_dbg(&client->dev, "Unknown chip type, skipping\n");
 832                 return -ENODEV;
 833         }
 834
 835         strlcpy(info->type, "gl520sm", I2C_NAME_SIZE);
 836
 837         return 0;
 838 }
 839
 840 /* Called when we have found a new GL520SM. */
 841 static void gl520_init_client(struct i2c_client *client)
 842 {
 843         struct gl520_data *data = i2c_get_clientdata(client);
 844         u8 oldconf, conf;
 845
 846         conf = oldconf = gl520_read_value(client, GL520_REG_CONF);
 847
 848         data->alarm_mask = 0xff;
 849         data->vrm = vid_which_vrm();
 850
 851         if (extra_sensor_type == 1)
 852                 conf &= ~0x10;
 853         else if (extra_sensor_type == 2)
 854                 conf |= 0x10;
 855         data->two_temps = !(conf & 0x10);
 856
 857         /* If IRQ# is disabled, we can safely force comparator mode */
 858         if (!(conf & 0x20))
 859                 conf &= 0xf7;
 860
 861         /* Enable monitoring if needed */
 862         conf |= 0x40;
 863
 864         if (conf != oldconf)
 865                 gl520_write_value(client, GL520_REG_CONF, conf);
 866
 867         gl520_update_device(&(client->dev));
 868
 869         if (data->fan_min[0] == 0)
 870                 data->alarm_mask &= ~0x20;
 871         if (data->fan_min[1] == 0)
 872                 data->alarm_mask &= ~0x40;
 873
 874         data->beep_mask &= data->alarm_mask;
 875         gl520_write_value(client, GL520_REG_BEEP_MASK, data->beep_mask);
 876 }
 877
 878 static int gl520_probe(struct i2c_client *client,
 879                        const struct i2c_device_id *id)
 880 {
 881         struct device *dev = &client->dev;
 882         struct device *hwmon_dev;
 883         struct gl520_data *data;
 884
 885         data = devm_kzalloc(dev, sizeof(struct gl520_data), GFP_KERNEL);
 886         if (!data)
 887                 return -ENOMEM;
 888
 889         i2c_set_clientdata(client, data);
 890         mutex_init(&data->update_lock);
 891         data->client = client;
 892
 893         /* Initialize the GL520SM chip */
 894         gl520_init_client(client);
 895
 896         /* sysfs hooks */
 897         data->groups[0] = &gl520_group;
 898
 899         if (data->two_temps)
 900                 data->groups[1] = &gl520_group_temp2;
 901         else
 902                 data->groups[1] = &gl520_group_in4;
 903
 904         hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
 905                                                            data, data->groups);
 906         return PTR_ERR_OR_ZERO(hwmon_dev);
 907 }
 908
 909 static const struct i2c_device_id gl520_id[] = {
 910         { "gl520sm", 0 },
 911         { }
 912 };
 913 MODULE_DEVICE_TABLE(i2c, gl520_id);
 914
 915 static struct i2c_driver gl520_driver = {
 916         .class          = I2C_CLASS_HWMON,
 917         .driver = {
 918                 .name   = "gl520sm",
 919         },
 920         .probe          = gl520_probe,
 921         .id_table       = gl520_id,
 922         .detect         = gl520_detect,
 923         .address_list   = normal_i2c,
 924 };
 925
 926 module_i2c_driver(gl520_driver);
 927
 928 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>, "
 929         "Kyösti Mälkki <kmalkki@cc.hut.fi>, "
 930         "Maarten Deprez <maartendeprez@users.sourceforge.net>");
 931 MODULE_DESCRIPTION("GL520SM driver");
 932 MODULE_LICENSE("GPL");