drivers/hwmon/gl518sm.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * gl518sm.c - Part of lm_sensors, Linux kernel modules for hardware
   4  *             monitoring
   5  * Copyright (C) 1998, 1999 Frodo Looijaard <frodol@dds.nl> and
   6  * Kyosti Malkki <kmalkki@cc.hut.fi>
   7  * Copyright (C) 2004 Hong-Gunn Chew <hglinux@gunnet.org> and
   8  * Jean Delvare <jdelvare@suse.de>
   9  *
  10  * Ported to Linux 2.6 by Hong-Gunn Chew with the help of Jean Delvare
  11  * and advice of Greg Kroah-Hartman.
  12  *
  13  * Notes about the port:
  14  * Release 0x00 of the GL518SM chipset doesn't support reading of in0,
  15  * in1 nor in2. The original driver had an ugly workaround to get them
  16  * anyway (changing limits and watching alarms trigger and wear off).
  17  * We did not keep that part of the original driver in the Linux 2.6
  18  * version, since it was making the driver significantly more complex
  19  * with no real benefit.
  20  */
  21
  22 #include <linux/module.h>
  23 #include <linux/init.h>
  24 #include <linux/slab.h>
  25 #include <linux/jiffies.h>
  26 #include <linux/i2c.h>
  27 #include <linux/hwmon.h>
  28 #include <linux/hwmon-sysfs.h>
  29 #include <linux/err.h>
  30 #include <linux/mutex.h>
  31 #include <linux/sysfs.h>
  32
  33 /* Addresses to scan */
  34 static const unsigned short normal_i2c[] = { 0x2c, 0x2d, I2C_CLIENT_END };
  35
  36 enum chips { gl518sm_r00, gl518sm_r80 };
  37
  38 /* Many GL518 constants specified below */
  39
  40 /* The GL518 registers */
  41 #define GL518_REG_CHIP_ID       0x00
  42 #define GL518_REG_REVISION      0x01
  43 #define GL518_REG_VENDOR_ID     0x02
  44 #define GL518_REG_CONF          0x03
  45 #define GL518_REG_TEMP_IN       0x04
  46 #define GL518_REG_TEMP_MAX      0x05
  47 #define GL518_REG_TEMP_HYST     0x06
  48 #define GL518_REG_FAN_COUNT     0x07
  49 #define GL518_REG_FAN_LIMIT     0x08
  50 #define GL518_REG_VIN1_LIMIT    0x09
  51 #define GL518_REG_VIN2_LIMIT    0x0a
  52 #define GL518_REG_VIN3_LIMIT    0x0b
  53 #define GL518_REG_VDD_LIMIT     0x0c
  54 #define GL518_REG_VIN3          0x0d
  55 #define GL518_REG_MISC          0x0f
  56 #define GL518_REG_ALARM         0x10
  57 #define GL518_REG_MASK          0x11
  58 #define GL518_REG_INT           0x12
  59 #define GL518_REG_VIN2          0x13
  60 #define GL518_REG_VIN1          0x14
  61 #define GL518_REG_VDD           0x15
  62
  63
  64 /*
  65  * Conversions. Rounding and limit checking is only done on the TO_REG
  66  * variants. Note that you should be a bit careful with which arguments
  67  * these macros are called: arguments may be evaluated more than once.
  68  * Fixing this is just not worth it.
  69  */
  70
  71 #define RAW_FROM_REG(val)       val
  72
  73 #define BOOL_FROM_REG(val)      ((val) ? 0 : 1)
  74 #define BOOL_TO_REG(val)        ((val) ? 0 : 1)
  75
  76 #define TEMP_CLAMP(val)         clamp_val(val, -119000, 136000)
  77 #define TEMP_TO_REG(val)        (DIV_ROUND_CLOSEST(TEMP_CLAMP(val), 1000) + 119)
  78 #define TEMP_FROM_REG(val)      (((val) - 119) * 1000)
  79
  80 static inline u8 FAN_TO_REG(long rpm, int div)
  81 {
  82         long rpmdiv;
  83         if (rpm == 0)
  84                 return 0;
  85         rpmdiv = clamp_val(rpm, 1, 960000) * div;
  86         return clamp_val((480000 + rpmdiv / 2) / rpmdiv, 1, 255);
  87 }
  88 #define FAN_FROM_REG(val, div)  ((val) == 0 ? 0 : (480000 / ((val) * (div))))
  89
  90 #define IN_CLAMP(val)           clamp_val(val, 0, 255 * 19)
  91 #define IN_TO_REG(val)          DIV_ROUND_CLOSEST(IN_CLAMP(val), 19)
  92 #define IN_FROM_REG(val)        ((val) * 19)
  93
  94 #define VDD_CLAMP(val)          clamp_val(val, 0, 255 * 95 / 4)
  95 #define VDD_TO_REG(val)         DIV_ROUND_CLOSEST(VDD_CLAMP(val) * 4, 95)
  96 #define VDD_FROM_REG(val)       DIV_ROUND_CLOSEST((val) * 95, 4)
  97
  98 #define DIV_FROM_REG(val)       (1 << (val))
  99
 100 #define BEEP_MASK_TO_REG(val)   ((val) & 0x7f & data->alarm_mask)
 101 #define BEEP_MASK_FROM_REG(val) ((val) & 0x7f)
 102
 103 /* Each client has this additional data */
 104 struct gl518_data {
 105         struct i2c_client *client;
 106         const struct attribute_group *groups[3];
 107         enum chips type;
 108
 109         struct mutex update_lock;
 110         bool valid;             /* true if following fields are valid */
 111         unsigned long last_updated;     /* In jiffies */
 112
 113         u8 voltage_in[4];       /* Register values; [0] = VDD */
 114         u8 voltage_min[4];      /* Register values; [0] = VDD */
 115         u8 voltage_max[4];      /* Register values; [0] = VDD */
 116         u8 fan_in[2];
 117         u8 fan_min[2];
 118         u8 fan_div[2];          /* Register encoding, shifted right */
 119         u8 fan_auto1;           /* Boolean */
 120         u8 temp_in;             /* Register values */
 121         u8 temp_max;            /* Register values */
 122         u8 temp_hyst;           /* Register values */
 123         u8 alarms;              /* Register value */
 124         u8 alarm_mask;
 125         u8 beep_mask;           /* Register value */
 126         u8 beep_enable;         /* Boolean */
 127 };
 128
 129 /*
 130  * Registers 0x07 to 0x0c are word-sized, others are byte-sized
 131  * GL518 uses a high-byte first convention, which is exactly opposite to
 132  * the SMBus standard.
 133  */
 134 static int gl518_read_value(struct i2c_client *client, u8 reg)
 135 {
 136         if ((reg >= 0x07) && (reg <= 0x0c))
 137                 return i2c_smbus_read_word_swapped(client, reg);
 138         else
 139                 return i2c_smbus_read_byte_data(client, reg);
 140 }
 141
 142 static int gl518_write_value(struct i2c_client *client, u8 reg, u16 value)
 143 {
 144         if ((reg >= 0x07) && (reg <= 0x0c))
 145                 return i2c_smbus_write_word_swapped(client, reg, value);
 146         else
 147                 return i2c_smbus_write_byte_data(client, reg, value);
 148 }
 149
 150 static struct gl518_data *gl518_update_device(struct device *dev)
 151 {
 152         struct gl518_data *data = dev_get_drvdata(dev);
 153         struct i2c_client *client = data->client;
 154         int val;
 155
 156         mutex_lock(&data->update_lock);
 157
 158         if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
 159             || !data->valid) {
 160                 dev_dbg(&client->dev, "Starting gl518 update\n");
 161
 162                 data->alarms = gl518_read_value(client, GL518_REG_INT);
 163                 data->beep_mask = gl518_read_value(client, GL518_REG_ALARM);
 164
 165                 val = gl518_read_value(client, GL518_REG_VDD_LIMIT);
 166                 data->voltage_min[0] = val & 0xff;
 167                 data->voltage_max[0] = (val >> 8) & 0xff;
 168                 val = gl518_read_value(client, GL518_REG_VIN1_LIMIT);
 169                 data->voltage_min[1] = val & 0xff;
 170                 data->voltage_max[1] = (val >> 8) & 0xff;
 171                 val = gl518_read_value(client, GL518_REG_VIN2_LIMIT);
 172                 data->voltage_min[2] = val & 0xff;
 173                 data->voltage_max[2] = (val >> 8) & 0xff;
 174                 val = gl518_read_value(client, GL518_REG_VIN3_LIMIT);
 175                 data->voltage_min[3] = val & 0xff;
 176                 data->voltage_max[3] = (val >> 8) & 0xff;
 177
 178                 val = gl518_read_value(client, GL518_REG_FAN_COUNT);
 179                 data->fan_in[0] = (val >> 8) & 0xff;
 180                 data->fan_in[1] = val & 0xff;
 181
 182                 val = gl518_read_value(client, GL518_REG_FAN_LIMIT);
 183                 data->fan_min[0] = (val >> 8) & 0xff;
 184                 data->fan_min[1] = val & 0xff;
 185
 186                 data->temp_in = gl518_read_value(client, GL518_REG_TEMP_IN);
 187                 data->temp_max =
 188                     gl518_read_value(client, GL518_REG_TEMP_MAX);
 189                 data->temp_hyst =
 190                     gl518_read_value(client, GL518_REG_TEMP_HYST);
 191
 192                 val = gl518_read_value(client, GL518_REG_MISC);
 193                 data->fan_div[0] = (val >> 6) & 0x03;
 194                 data->fan_div[1] = (val >> 4) & 0x03;
 195                 data->fan_auto1  = (val >> 3) & 0x01;
 196
 197                 data->alarms &= data->alarm_mask;
 198
 199                 val = gl518_read_value(client, GL518_REG_CONF);
 200                 data->beep_enable = (val >> 2) & 1;
 201
 202                 if (data->type != gl518sm_r00) {
 203                         data->voltage_in[0] =
 204                             gl518_read_value(client, GL518_REG_VDD);
 205                         data->voltage_in[1] =
 206                             gl518_read_value(client, GL518_REG_VIN1);
 207                         data->voltage_in[2] =
 208                             gl518_read_value(client, GL518_REG_VIN2);
 209                 }
 210                 data->voltage_in[3] =
 211                     gl518_read_value(client, GL518_REG_VIN3);
 212
 213                 data->last_updated = jiffies;
 214                 data->valid = true;
 215         }
 216
 217         mutex_unlock(&data->update_lock);
 218
 219         return data;
 220 }
 221
 222 /*
 223  * Sysfs stuff
 224  */
 225
 226 #define show(type, suffix, value)                                       \
 227 static ssize_t show_##suffix(struct device *dev,                        \
 228                              struct device_attribute *attr, char *buf)  \
 229 {                                                                       \
 230         struct gl518_data *data = gl518_update_device(dev);             \
 231         return sprintf(buf, "%d\n", type##_FROM_REG(data->value));      \
 232 }
 233
 234 show(TEMP, temp_input1, temp_in);
 235 show(TEMP, temp_max1, temp_max);
 236 show(TEMP, temp_hyst1, temp_hyst);
 237 show(BOOL, fan_auto1, fan_auto1);
 238 show(VDD, in_input0, voltage_in[0]);
 239 show(IN, in_input1, voltage_in[1]);
 240 show(IN, in_input2, voltage_in[2]);
 241 show(IN, in_input3, voltage_in[3]);
 242 show(VDD, in_min0, voltage_min[0]);
 243 show(IN, in_min1, voltage_min[1]);
 244 show(IN, in_min2, voltage_min[2]);
 245 show(IN, in_min3, voltage_min[3]);
 246 show(VDD, in_max0, voltage_max[0]);
 247 show(IN, in_max1, voltage_max[1]);
 248 show(IN, in_max2, voltage_max[2]);
 249 show(IN, in_max3, voltage_max[3]);
 250 show(RAW, alarms, alarms);
 251 show(BOOL, beep_enable, beep_enable);
 252 show(BEEP_MASK, beep_mask, beep_mask);
 253
 254 static ssize_t fan_input_show(struct device *dev,
 255                               struct device_attribute *attr, char *buf)
 256 {
 257         int nr = to_sensor_dev_attr(attr)->index;
 258         struct gl518_data *data = gl518_update_device(dev);
 259         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_in[nr],
 260                                         DIV_FROM_REG(data->fan_div[nr])));
 261 }
 262
 263 static ssize_t fan_min_show(struct device *dev, struct device_attribute *attr,
 264                             char *buf)
 265 {
 266         int nr = to_sensor_dev_attr(attr)->index;
 267         struct gl518_data *data = gl518_update_device(dev);
 268         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[nr],
 269                                         DIV_FROM_REG(data->fan_div[nr])));
 270 }
 271
 272 static ssize_t fan_div_show(struct device *dev, struct device_attribute *attr,
 273                             char *buf)
 274 {
 275         int nr = to_sensor_dev_attr(attr)->index;
 276         struct gl518_data *data = gl518_update_device(dev);
 277         return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]));
 278 }
 279
 280 #define set(type, suffix, value, reg)                                   \
 281 static ssize_t set_##suffix(struct device *dev,                         \
 282                             struct device_attribute *attr,              \
 283                             const char *buf, size_t count)              \
 284 {                                                                       \
 285         struct gl518_data *data = dev_get_drvdata(dev);                 \
 286         struct i2c_client *client = data->client;                       \
 287         long val;                                                       \
 288         int err = kstrtol(buf, 10, &val);                               \
 289         if (err)                                                        \
 290                 return err;                                             \
 291                                                                         \
 292         mutex_lock(&data->update_lock);                                 \
 293         data->value = type##_TO_REG(val);                               \
 294         gl518_write_value(client, reg, data->value);                    \
 295         mutex_unlock(&data->update_lock);                               \
 296         return count;                                                   \
 297 }
 298
 299 #define set_bits(type, suffix, value, reg, mask, shift)                 \
 300 static ssize_t set_##suffix(struct device *dev,                         \
 301                             struct device_attribute *attr,              \
 302                             const char *buf, size_t count)              \
 303 {                                                                       \
 304         struct gl518_data *data = dev_get_drvdata(dev);                 \
 305         struct i2c_client *client = data->client;                       \
 306         int regvalue;                                                   \
 307         unsigned long val;                                              \
 308         int err = kstrtoul(buf, 10, &val);                              \
 309         if (err)                                                        \
 310                 return err;                                             \
 311                                                                         \
 312         mutex_lock(&data->update_lock);                                 \
 313         regvalue = gl518_read_value(client, reg);                       \
 314         data->value = type##_TO_REG(val);                               \
 315         regvalue = (regvalue & ~mask) | (data->value << shift);         \
 316         gl518_write_value(client, reg, regvalue);                       \
 317         mutex_unlock(&data->update_lock);                               \
 318         return count;                                                   \
 319 }
 320
 321 #define set_low(type, suffix, value, reg)                               \
 322         set_bits(type, suffix, value, reg, 0x00ff, 0)
 323 #define set_high(type, suffix, value, reg)                              \
 324         set_bits(type, suffix, value, reg, 0xff00, 8)
 325
 326 set(TEMP, temp_max1, temp_max, GL518_REG_TEMP_MAX);
 327 set(TEMP, temp_hyst1, temp_hyst, GL518_REG_TEMP_HYST);
 328 set_bits(BOOL, fan_auto1, fan_auto1, GL518_REG_MISC, 0x08, 3);
 329 set_low(VDD, in_min0, voltage_min[0], GL518_REG_VDD_LIMIT);
 330 set_low(IN, in_min1, voltage_min[1], GL518_REG_VIN1_LIMIT);
 331 set_low(IN, in_min2, voltage_min[2], GL518_REG_VIN2_LIMIT);
 332 set_low(IN, in_min3, voltage_min[3], GL518_REG_VIN3_LIMIT);
 333 set_high(VDD, in_max0, voltage_max[0], GL518_REG_VDD_LIMIT);
 334 set_high(IN, in_max1, voltage_max[1], GL518_REG_VIN1_LIMIT);
 335 set_high(IN, in_max2, voltage_max[2], GL518_REG_VIN2_LIMIT);
 336 set_high(IN, in_max3, voltage_max[3], GL518_REG_VIN3_LIMIT);
 337 set_bits(BOOL, beep_enable, beep_enable, GL518_REG_CONF, 0x04, 2);
 338 set(BEEP_MASK, beep_mask, beep_mask, GL518_REG_ALARM);
 339
 340 static ssize_t fan_min_store(struct device *dev,
 341                              struct device_attribute *attr, const char *buf,
 342                              size_t count)
 343 {
 344         struct gl518_data *data = dev_get_drvdata(dev);
 345         struct i2c_client *client = data->client;
 346         int nr = to_sensor_dev_attr(attr)->index;
 347         int regvalue;
 348         unsigned long val;
 349         int err;
 350
 351         err = kstrtoul(buf, 10, &val);
 352         if (err)
 353                 return err;
 354
 355         mutex_lock(&data->update_lock);
 356         regvalue = gl518_read_value(client, GL518_REG_FAN_LIMIT);
 357         data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
 358         regvalue = (regvalue & (0xff << (8 * nr)))
 359                  | (data->fan_min[nr] << (8 * (1 - nr)));
 360         gl518_write_value(client, GL518_REG_FAN_LIMIT, regvalue);
 361
 362         data->beep_mask = gl518_read_value(client, GL518_REG_ALARM);
 363         if (data->fan_min[nr] == 0)
 364                 data->alarm_mask &= ~(0x20 << nr);
 365         else
 366                 data->alarm_mask |= (0x20 << nr);
 367         data->beep_mask &= data->alarm_mask;
 368         gl518_write_value(client, GL518_REG_ALARM, data->beep_mask);
 369
 370         mutex_unlock(&data->update_lock);
 371         return count;
 372 }
 373
 374 static ssize_t fan_div_store(struct device *dev,
 375                              struct device_attribute *attr, const char *buf,
 376                              size_t count)
 377 {
 378         struct gl518_data *data = dev_get_drvdata(dev);
 379         struct i2c_client *client = data->client;
 380         int nr = to_sensor_dev_attr(attr)->index;
 381         int regvalue;
 382         unsigned long val;
 383         int err;
 384
 385         err = kstrtoul(buf, 10, &val);
 386         if (err)
 387                 return err;
 388
 389         switch (val) {
 390         case 1:
 391                 val = 0;
 392                 break;
 393         case 2:
 394                 val = 1;
 395                 break;
 396         case 4:
 397                 val = 2;
 398                 break;
 399         case 8:
 400                 val = 3;
 401                 break;
 402         default:
 403                 dev_err(dev,
 404                         "Invalid fan clock divider %lu, choose one of 1, 2, 4 or 8\n",
 405                         val);
 406                 return -EINVAL;
 407         }
 408
 409         mutex_lock(&data->update_lock);
 410         regvalue = gl518_read_value(client, GL518_REG_MISC);
 411         data->fan_div[nr] = val;
 412         regvalue = (regvalue & ~(0xc0 >> (2 * nr)))
 413                  | (data->fan_div[nr] << (6 - 2 * nr));
 414         gl518_write_value(client, GL518_REG_MISC, regvalue);
 415         mutex_unlock(&data->update_lock);
 416         return count;
 417 }
 418
 419 static DEVICE_ATTR(temp1_input, 0444, show_temp_input1, NULL);
 420 static DEVICE_ATTR(temp1_max, 0644, show_temp_max1, set_temp_max1);
 421 static DEVICE_ATTR(temp1_max_hyst, 0644,
 422                    show_temp_hyst1, set_temp_hyst1);
 423 static DEVICE_ATTR(fan1_auto, 0644, show_fan_auto1, set_fan_auto1);
 424 static SENSOR_DEVICE_ATTR_RO(fan1_input, fan_input, 0);
 425 static SENSOR_DEVICE_ATTR_RO(fan2_input, fan_input, 1);
 426 static SENSOR_DEVICE_ATTR_RW(fan1_min, fan_min, 0);
 427 static SENSOR_DEVICE_ATTR_RW(fan2_min, fan_min, 1);
 428 static SENSOR_DEVICE_ATTR_RW(fan1_div, fan_div, 0);
 429 static SENSOR_DEVICE_ATTR_RW(fan2_div, fan_div, 1);
 430 static DEVICE_ATTR(in0_input, 0444, show_in_input0, NULL);
 431 static DEVICE_ATTR(in1_input, 0444, show_in_input1, NULL);
 432 static DEVICE_ATTR(in2_input, 0444, show_in_input2, NULL);
 433 static DEVICE_ATTR(in3_input, 0444, show_in_input3, NULL);
 434 static DEVICE_ATTR(in0_min, 0644, show_in_min0, set_in_min0);
 435 static DEVICE_ATTR(in1_min, 0644, show_in_min1, set_in_min1);
 436 static DEVICE_ATTR(in2_min, 0644, show_in_min2, set_in_min2);
 437 static DEVICE_ATTR(in3_min, 0644, show_in_min3, set_in_min3);
 438 static DEVICE_ATTR(in0_max, 0644, show_in_max0, set_in_max0);
 439 static DEVICE_ATTR(in1_max, 0644, show_in_max1, set_in_max1);
 440 static DEVICE_ATTR(in2_max, 0644, show_in_max2, set_in_max2);
 441 static DEVICE_ATTR(in3_max, 0644, show_in_max3, set_in_max3);
 442 static DEVICE_ATTR(alarms, 0444, show_alarms, NULL);
 443 static DEVICE_ATTR(beep_enable, 0644,
 444                    show_beep_enable, set_beep_enable);
 445 static DEVICE_ATTR(beep_mask, 0644,
 446                    show_beep_mask, set_beep_mask);
 447
 448 static ssize_t alarm_show(struct device *dev, struct device_attribute *attr,
 449                           char *buf)
 450 {
 451         int bitnr = to_sensor_dev_attr(attr)->index;
 452         struct gl518_data *data = gl518_update_device(dev);
 453         return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
 454 }
 455
 456 static SENSOR_DEVICE_ATTR_RO(in0_alarm, alarm, 0);
 457 static SENSOR_DEVICE_ATTR_RO(in1_alarm, alarm, 1);
 458 static SENSOR_DEVICE_ATTR_RO(in2_alarm, alarm, 2);
 459 static SENSOR_DEVICE_ATTR_RO(in3_alarm, alarm, 3);
 460 static SENSOR_DEVICE_ATTR_RO(temp1_alarm, alarm, 4);
 461 static SENSOR_DEVICE_ATTR_RO(fan1_alarm, alarm, 5);
 462 static SENSOR_DEVICE_ATTR_RO(fan2_alarm, alarm, 6);
 463
 464 static ssize_t beep_show(struct device *dev, struct device_attribute *attr,
 465                          char *buf)
 466 {
 467         int bitnr = to_sensor_dev_attr(attr)->index;
 468         struct gl518_data *data = gl518_update_device(dev);
 469         return sprintf(buf, "%u\n", (data->beep_mask >> bitnr) & 1);
 470 }
 471
 472 static ssize_t beep_store(struct device *dev, struct device_attribute *attr,
 473                           const char *buf, size_t count)
 474 {
 475         struct gl518_data *data = dev_get_drvdata(dev);
 476         struct i2c_client *client = data->client;
 477         int bitnr = to_sensor_dev_attr(attr)->index;
 478         unsigned long bit;
 479         int err;
 480
 481         err = kstrtoul(buf, 10, &bit);
 482         if (err)
 483                 return err;
 484
 485         if (bit & ~1)
 486                 return -EINVAL;
 487
 488         mutex_lock(&data->update_lock);
 489         data->beep_mask = gl518_read_value(client, GL518_REG_ALARM);
 490         if (bit)
 491                 data->beep_mask |= (1 << bitnr);
 492         else
 493                 data->beep_mask &= ~(1 << bitnr);
 494         gl518_write_value(client, GL518_REG_ALARM, data->beep_mask);
 495         mutex_unlock(&data->update_lock);
 496         return count;
 497 }
 498
 499 static SENSOR_DEVICE_ATTR_RW(in0_beep, beep, 0);
 500 static SENSOR_DEVICE_ATTR_RW(in1_beep, beep, 1);
 501 static SENSOR_DEVICE_ATTR_RW(in2_beep, beep, 2);
 502 static SENSOR_DEVICE_ATTR_RW(in3_beep, beep, 3);
 503 static SENSOR_DEVICE_ATTR_RW(temp1_beep, beep, 4);
 504 static SENSOR_DEVICE_ATTR_RW(fan1_beep, beep, 5);
 505 static SENSOR_DEVICE_ATTR_RW(fan2_beep, beep, 6);
 506
 507 static struct attribute *gl518_attributes[] = {
 508         &dev_attr_in3_input.attr,
 509         &dev_attr_in0_min.attr,
 510         &dev_attr_in1_min.attr,
 511         &dev_attr_in2_min.attr,
 512         &dev_attr_in3_min.attr,
 513         &dev_attr_in0_max.attr,
 514         &dev_attr_in1_max.attr,
 515         &dev_attr_in2_max.attr,
 516         &dev_attr_in3_max.attr,
 517         &sensor_dev_attr_in0_alarm.dev_attr.attr,
 518         &sensor_dev_attr_in1_alarm.dev_attr.attr,
 519         &sensor_dev_attr_in2_alarm.dev_attr.attr,
 520         &sensor_dev_attr_in3_alarm.dev_attr.attr,
 521         &sensor_dev_attr_in0_beep.dev_attr.attr,
 522         &sensor_dev_attr_in1_beep.dev_attr.attr,
 523         &sensor_dev_attr_in2_beep.dev_attr.attr,
 524         &sensor_dev_attr_in3_beep.dev_attr.attr,
 525
 526         &dev_attr_fan1_auto.attr,
 527         &sensor_dev_attr_fan1_input.dev_attr.attr,
 528         &sensor_dev_attr_fan2_input.dev_attr.attr,
 529         &sensor_dev_attr_fan1_min.dev_attr.attr,
 530         &sensor_dev_attr_fan2_min.dev_attr.attr,
 531         &sensor_dev_attr_fan1_div.dev_attr.attr,
 532         &sensor_dev_attr_fan2_div.dev_attr.attr,
 533         &sensor_dev_attr_fan1_alarm.dev_attr.attr,
 534         &sensor_dev_attr_fan2_alarm.dev_attr.attr,
 535         &sensor_dev_attr_fan1_beep.dev_attr.attr,
 536         &sensor_dev_attr_fan2_beep.dev_attr.attr,
 537
 538         &dev_attr_temp1_input.attr,
 539         &dev_attr_temp1_max.attr,
 540         &dev_attr_temp1_max_hyst.attr,
 541         &sensor_dev_attr_temp1_alarm.dev_attr.attr,
 542         &sensor_dev_attr_temp1_beep.dev_attr.attr,
 543
 544         &dev_attr_alarms.attr,
 545         &dev_attr_beep_enable.attr,
 546         &dev_attr_beep_mask.attr,
 547         NULL
 548 };
 549
 550 static const struct attribute_group gl518_group = {
 551         .attrs = gl518_attributes,
 552 };
 553
 554 static struct attribute *gl518_attributes_r80[] = {
 555         &dev_attr_in0_input.attr,
 556         &dev_attr_in1_input.attr,
 557         &dev_attr_in2_input.attr,
 558         NULL
 559 };
 560
 561 static const struct attribute_group gl518_group_r80 = {
 562         .attrs = gl518_attributes_r80,
 563 };
 564
 565 /*
 566  * Real code
 567  */
 568
 569 /* Return 0 if detection is successful, -ENODEV otherwise */
 570 static int gl518_detect(struct i2c_client *client, struct i2c_board_info *info)
 571 {
 572         struct i2c_adapter *adapter = client->adapter;
 573         int rev;
 574
 575         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
 576                                      I2C_FUNC_SMBUS_WORD_DATA))
 577                 return -ENODEV;
 578
 579         /* Now, we do the remaining detection. */
 580         if ((gl518_read_value(client, GL518_REG_CHIP_ID) != 0x80)
 581          || (gl518_read_value(client, GL518_REG_CONF) & 0x80))
 582                 return -ENODEV;
 583
 584         /* Determine the chip type. */
 585         rev = gl518_read_value(client, GL518_REG_REVISION);
 586         if (rev != 0x00 && rev != 0x80)
 587                 return -ENODEV;
 588
 589         strscpy(info->type, "gl518sm", I2C_NAME_SIZE);
 590
 591         return 0;
 592 }
 593
 594 /*
 595  * Called when we have found a new GL518SM.
 596  * Note that we preserve D4:NoFan2 and D2:beep_enable.
 597  */
 598 static void gl518_init_client(struct i2c_client *client)
 599 {
 600         /* Make sure we leave D7:Reset untouched */
 601         u8 regvalue = gl518_read_value(client, GL518_REG_CONF) & 0x7f;
 602
 603         /* Comparator mode (D3=0), standby mode (D6=0) */
 604         gl518_write_value(client, GL518_REG_CONF, (regvalue &= 0x37));
 605
 606         /* Never interrupts */
 607         gl518_write_value(client, GL518_REG_MASK, 0x00);
 608
 609         /* Clear status register (D5=1), start (D6=1) */
 610         gl518_write_value(client, GL518_REG_CONF, 0x20 | regvalue);
 611         gl518_write_value(client, GL518_REG_CONF, 0x40 | regvalue);
 612 }
 613
 614 static int gl518_probe(struct i2c_client *client)
 615 {
 616         struct device *dev = &client->dev;
 617         struct device *hwmon_dev;
 618         struct gl518_data *data;
 619         int revision;
 620
 621         data = devm_kzalloc(dev, sizeof(struct gl518_data), GFP_KERNEL);
 622         if (!data)
 623                 return -ENOMEM;
 624
 625         data->client = client;
 626         revision = gl518_read_value(client, GL518_REG_REVISION);
 627         data->type = revision == 0x80 ? gl518sm_r80 : gl518sm_r00;
 628         mutex_init(&data->update_lock);
 629
 630         /* Initialize the GL518SM chip */
 631         data->alarm_mask = 0xff;
 632         gl518_init_client(client);
 633
 634         /* sysfs hooks */
 635         data->groups[0] = &gl518_group;
 636         if (data->type == gl518sm_r80)
 637                 data->groups[1] = &gl518_group_r80;
 638
 639         hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
 640                                                            data, data->groups);
 641         return PTR_ERR_OR_ZERO(hwmon_dev);
 642 }
 643
 644 static const struct i2c_device_id gl518_id[] = {
 645         { "gl518sm", 0 },
 646         { }
 647 };
 648 MODULE_DEVICE_TABLE(i2c, gl518_id);
 649
 650 static struct i2c_driver gl518_driver = {
 651         .class          = I2C_CLASS_HWMON,
 652         .driver = {
 653                 .name   = "gl518sm",
 654         },
 655         .probe          = gl518_probe,
 656         .id_table       = gl518_id,
 657         .detect         = gl518_detect,
 658         .address_list   = normal_i2c,
 659 };
 660
 661 module_i2c_driver(gl518_driver);
 662
 663 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>, "
 664         "Kyosti Malkki <kmalkki@cc.hut.fi> and "
 665         "Hong-Gunn Chew <hglinux@gunnet.org>");
 666 MODULE_DESCRIPTION("GL518SM driver");
 667 MODULE_LICENSE("GPL");