drivers/hwmon/gl518sm.c

   1 /*
   2  * gl518sm.c - Part of lm_sensors, Linux kernel modules for hardware
   3  *             monitoring
   4  * Copyright (C) 1998, 1999 Frodo Looijaard <frodol@dds.nl> and
   5  * Kyosti Malkki <kmalkki@cc.hut.fi>
   6  * Copyright (C) 2004 Hong-Gunn Chew <hglinux@gunnet.org> and
   7  * Jean Delvare <jdelvare@suse.de>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  *
  23  * Ported to Linux 2.6 by Hong-Gunn Chew with the help of Jean Delvare
  24  * and advice of Greg Kroah-Hartman.
  25  *
  26  * Notes about the port:
  27  * Release 0x00 of the GL518SM chipset doesn't support reading of in0,
  28  * in1 nor in2. The original driver had an ugly workaround to get them
  29  * anyway (changing limits and watching alarms trigger and wear off).
  30  * We did not keep that part of the original driver in the Linux 2.6
  31  * version, since it was making the driver significantly more complex
  32  * with no real benefit.
  33  */
  34
  35 #include <linux/module.h>
  36 #include <linux/init.h>
  37 #include <linux/slab.h>
  38 #include <linux/jiffies.h>
  39 #include <linux/i2c.h>
  40 #include <linux/hwmon.h>
  41 #include <linux/hwmon-sysfs.h>
  42 #include <linux/err.h>
  43 #include <linux/mutex.h>
  44 #include <linux/sysfs.h>
  45
  46 /* Addresses to scan */
  47 static const unsigned short normal_i2c[] = { 0x2c, 0x2d, I2C_CLIENT_END };
  48
  49 enum chips { gl518sm_r00, gl518sm_r80 };
  50
  51 /* Many GL518 constants specified below */
  52
  53 /* The GL518 registers */
  54 #define GL518_REG_CHIP_ID       0x00
  55 #define GL518_REG_REVISION      0x01
  56 #define GL518_REG_VENDOR_ID     0x02
  57 #define GL518_REG_CONF          0x03
  58 #define GL518_REG_TEMP_IN       0x04
  59 #define GL518_REG_TEMP_MAX      0x05
  60 #define GL518_REG_TEMP_HYST     0x06
  61 #define GL518_REG_FAN_COUNT     0x07
  62 #define GL518_REG_FAN_LIMIT     0x08
  63 #define GL518_REG_VIN1_LIMIT    0x09
  64 #define GL518_REG_VIN2_LIMIT    0x0a
  65 #define GL518_REG_VIN3_LIMIT    0x0b
  66 #define GL518_REG_VDD_LIMIT     0x0c
  67 #define GL518_REG_VIN3          0x0d
  68 #define GL518_REG_MISC          0x0f
  69 #define GL518_REG_ALARM         0x10
  70 #define GL518_REG_MASK          0x11
  71 #define GL518_REG_INT           0x12
  72 #define GL518_REG_VIN2          0x13
  73 #define GL518_REG_VIN1          0x14
  74 #define GL518_REG_VDD           0x15
  75
  76
  77 /*
  78  * Conversions. Rounding and limit checking is only done on the TO_REG
  79  * variants. Note that you should be a bit careful with which arguments
  80  * these macros are called: arguments may be evaluated more than once.
  81  * Fixing this is just not worth it.
  82  */
  83
  84 #define RAW_FROM_REG(val)       val
  85
  86 #define BOOL_FROM_REG(val)      ((val) ? 0 : 1)
  87 #define BOOL_TO_REG(val)        ((val) ? 0 : 1)
  88
  89 #define TEMP_TO_REG(val)        clamp_val(((((val) < 0 ? \
  90                                 (val) - 500 : \
  91                                 (val) + 500) / 1000) + 119), 0, 255)
  92 #define TEMP_FROM_REG(val)      (((val) - 119) * 1000)
  93
  94 static inline u8 FAN_TO_REG(long rpm, int div)
  95 {
  96         long rpmdiv;
  97         if (rpm == 0)
  98                 return 0;
  99         rpmdiv = clamp_val(rpm, 1, 960000) * div;
 100         return clamp_val((480000 + rpmdiv / 2) / rpmdiv, 1, 255);
 101 }
 102 #define FAN_FROM_REG(val, div)  ((val) == 0 ? 0 : (480000 / ((val) * (div))))
 103
 104 #define IN_TO_REG(val)          clamp_val((((val) + 9) / 19), 0, 255)
 105 #define IN_FROM_REG(val)        ((val) * 19)
 106
 107 #define VDD_TO_REG(val)         clamp_val((((val) * 4 + 47) / 95), 0, 255)
 108 #define VDD_FROM_REG(val)       (((val) * 95 + 2) / 4)
 109
 110 #define DIV_FROM_REG(val)       (1 << (val))
 111
 112 #define BEEP_MASK_TO_REG(val)   ((val) & 0x7f & data->alarm_mask)
 113 #define BEEP_MASK_FROM_REG(val) ((val) & 0x7f)
 114
 115 /* Each client has this additional data */
 116 struct gl518_data {
 117         struct i2c_client *client;
 118         const struct attribute_group *groups[3];
 119         enum chips type;
 120
 121         struct mutex update_lock;
 122         char valid;             /* !=0 if following fields are valid */
 123         unsigned long last_updated;     /* In jiffies */
 124
 125         u8 voltage_in[4];       /* Register values; [0] = VDD */
 126         u8 voltage_min[4];      /* Register values; [0] = VDD */
 127         u8 voltage_max[4];      /* Register values; [0] = VDD */
 128         u8 fan_in[2];
 129         u8 fan_min[2];
 130         u8 fan_div[2];          /* Register encoding, shifted right */
 131         u8 fan_auto1;           /* Boolean */
 132         u8 temp_in;             /* Register values */
 133         u8 temp_max;            /* Register values */
 134         u8 temp_hyst;           /* Register values */
 135         u8 alarms;              /* Register value */
 136         u8 alarm_mask;
 137         u8 beep_mask;           /* Register value */
 138         u8 beep_enable;         /* Boolean */
 139 };
 140
 141 /*
 142  * Registers 0x07 to 0x0c are word-sized, others are byte-sized
 143  * GL518 uses a high-byte first convention, which is exactly opposite to
 144  * the SMBus standard.
 145  */
 146 static int gl518_read_value(struct i2c_client *client, u8 reg)
 147 {
 148         if ((reg >= 0x07) && (reg <= 0x0c))
 149                 return i2c_smbus_read_word_swapped(client, reg);
 150         else
 151                 return i2c_smbus_read_byte_data(client, reg);
 152 }
 153
 154 static int gl518_write_value(struct i2c_client *client, u8 reg, u16 value)
 155 {
 156         if ((reg >= 0x07) && (reg <= 0x0c))
 157                 return i2c_smbus_write_word_swapped(client, reg, value);
 158         else
 159                 return i2c_smbus_write_byte_data(client, reg, value);
 160 }
 161
 162 static struct gl518_data *gl518_update_device(struct device *dev)
 163 {
 164         struct gl518_data *data = dev_get_drvdata(dev);
 165         struct i2c_client *client = data->client;
 166         int val;
 167
 168         mutex_lock(&data->update_lock);
 169
 170         if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
 171             || !data->valid) {
 172                 dev_dbg(&client->dev, "Starting gl518 update\n");
 173
 174                 data->alarms = gl518_read_value(client, GL518_REG_INT);
 175                 data->beep_mask = gl518_read_value(client, GL518_REG_ALARM);
 176
 177                 val = gl518_read_value(client, GL518_REG_VDD_LIMIT);
 178                 data->voltage_min[0] = val & 0xff;
 179                 data->voltage_max[0] = (val >> 8) & 0xff;
 180                 val = gl518_read_value(client, GL518_REG_VIN1_LIMIT);
 181                 data->voltage_min[1] = val & 0xff;
 182                 data->voltage_max[1] = (val >> 8) & 0xff;
 183                 val = gl518_read_value(client, GL518_REG_VIN2_LIMIT);
 184                 data->voltage_min[2] = val & 0xff;
 185                 data->voltage_max[2] = (val >> 8) & 0xff;
 186                 val = gl518_read_value(client, GL518_REG_VIN3_LIMIT);
 187                 data->voltage_min[3] = val & 0xff;
 188                 data->voltage_max[3] = (val >> 8) & 0xff;
 189
 190                 val = gl518_read_value(client, GL518_REG_FAN_COUNT);
 191                 data->fan_in[0] = (val >> 8) & 0xff;
 192                 data->fan_in[1] = val & 0xff;
 193
 194                 val = gl518_read_value(client, GL518_REG_FAN_LIMIT);
 195                 data->fan_min[0] = (val >> 8) & 0xff;
 196                 data->fan_min[1] = val & 0xff;
 197
 198                 data->temp_in = gl518_read_value(client, GL518_REG_TEMP_IN);
 199                 data->temp_max =
 200                     gl518_read_value(client, GL518_REG_TEMP_MAX);
 201                 data->temp_hyst =
 202                     gl518_read_value(client, GL518_REG_TEMP_HYST);
 203
 204                 val = gl518_read_value(client, GL518_REG_MISC);
 205                 data->fan_div[0] = (val >> 6) & 0x03;
 206                 data->fan_div[1] = (val >> 4) & 0x03;
 207                 data->fan_auto1  = (val >> 3) & 0x01;
 208
 209                 data->alarms &= data->alarm_mask;
 210
 211                 val = gl518_read_value(client, GL518_REG_CONF);
 212                 data->beep_enable = (val >> 2) & 1;
 213
 214                 if (data->type != gl518sm_r00) {
 215                         data->voltage_in[0] =
 216                             gl518_read_value(client, GL518_REG_VDD);
 217                         data->voltage_in[1] =
 218                             gl518_read_value(client, GL518_REG_VIN1);
 219                         data->voltage_in[2] =
 220                             gl518_read_value(client, GL518_REG_VIN2);
 221                 }
 222                 data->voltage_in[3] =
 223                     gl518_read_value(client, GL518_REG_VIN3);
 224
 225                 data->last_updated = jiffies;
 226                 data->valid = 1;
 227         }
 228
 229         mutex_unlock(&data->update_lock);
 230
 231         return data;
 232 }
 233
 234 /*
 235  * Sysfs stuff
 236  */
 237
 238 #define show(type, suffix, value)                                       \
 239 static ssize_t show_##suffix(struct device *dev,                        \
 240                              struct device_attribute *attr, char *buf)  \
 241 {                                                                       \
 242         struct gl518_data *data = gl518_update_device(dev);             \
 243         return sprintf(buf, "%d\n", type##_FROM_REG(data->value));      \
 244 }
 245
 246 show(TEMP, temp_input1, temp_in);
 247 show(TEMP, temp_max1, temp_max);
 248 show(TEMP, temp_hyst1, temp_hyst);
 249 show(BOOL, fan_auto1, fan_auto1);
 250 show(VDD, in_input0, voltage_in[0]);
 251 show(IN, in_input1, voltage_in[1]);
 252 show(IN, in_input2, voltage_in[2]);
 253 show(IN, in_input3, voltage_in[3]);
 254 show(VDD, in_min0, voltage_min[0]);
 255 show(IN, in_min1, voltage_min[1]);
 256 show(IN, in_min2, voltage_min[2]);
 257 show(IN, in_min3, voltage_min[3]);
 258 show(VDD, in_max0, voltage_max[0]);
 259 show(IN, in_max1, voltage_max[1]);
 260 show(IN, in_max2, voltage_max[2]);
 261 show(IN, in_max3, voltage_max[3]);
 262 show(RAW, alarms, alarms);
 263 show(BOOL, beep_enable, beep_enable);
 264 show(BEEP_MASK, beep_mask, beep_mask);
 265
 266 static ssize_t show_fan_input(struct device *dev,
 267                               struct device_attribute *attr, char *buf)
 268 {
 269         int nr = to_sensor_dev_attr(attr)->index;
 270         struct gl518_data *data = gl518_update_device(dev);
 271         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_in[nr],
 272                                         DIV_FROM_REG(data->fan_div[nr])));
 273 }
 274
 275 static ssize_t show_fan_min(struct device *dev,
 276                             struct device_attribute *attr, char *buf)
 277 {
 278         int nr = to_sensor_dev_attr(attr)->index;
 279         struct gl518_data *data = gl518_update_device(dev);
 280         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[nr],
 281                                         DIV_FROM_REG(data->fan_div[nr])));
 282 }
 283
 284 static ssize_t show_fan_div(struct device *dev,
 285                             struct device_attribute *attr, char *buf)
 286 {
 287         int nr = to_sensor_dev_attr(attr)->index;
 288         struct gl518_data *data = gl518_update_device(dev);
 289         return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]));
 290 }
 291
 292 #define set(type, suffix, value, reg)                                   \
 293 static ssize_t set_##suffix(struct device *dev,                         \
 294                             struct device_attribute *attr,              \
 295                             const char *buf, size_t count)              \
 296 {                                                                       \
 297         struct gl518_data *data = dev_get_drvdata(dev);                 \
 298         struct i2c_client *client = data->client;                       \
 299         long val;                                                       \
 300         int err = kstrtol(buf, 10, &val);                               \
 301         if (err)                                                        \
 302                 return err;                                             \
 303                                                                         \
 304         mutex_lock(&data->update_lock);                                 \
 305         data->value = type##_TO_REG(val);                               \
 306         gl518_write_value(client, reg, data->value);                    \
 307         mutex_unlock(&data->update_lock);                               \
 308         return count;                                                   \
 309 }
 310
 311 #define set_bits(type, suffix, value, reg, mask, shift)                 \
 312 static ssize_t set_##suffix(struct device *dev,                         \
 313                             struct device_attribute *attr,              \
 314                             const char *buf, size_t count)              \
 315 {                                                                       \
 316         struct gl518_data *data = dev_get_drvdata(dev);                 \
 317         struct i2c_client *client = data->client;                       \
 318         int regvalue;                                                   \
 319         unsigned long val;                                              \
 320         int err = kstrtoul(buf, 10, &val);                              \
 321         if (err)                                                        \
 322                 return err;                                             \
 323                                                                         \
 324         mutex_lock(&data->update_lock);                                 \
 325         regvalue = gl518_read_value(client, reg);                       \
 326         data->value = type##_TO_REG(val);                               \
 327         regvalue = (regvalue & ~mask) | (data->value << shift);         \
 328         gl518_write_value(client, reg, regvalue);                       \
 329         mutex_unlock(&data->update_lock);                               \
 330         return count;                                                   \
 331 }
 332
 333 #define set_low(type, suffix, value, reg)                               \
 334         set_bits(type, suffix, value, reg, 0x00ff, 0)
 335 #define set_high(type, suffix, value, reg)                              \
 336         set_bits(type, suffix, value, reg, 0xff00, 8)
 337
 338 set(TEMP, temp_max1, temp_max, GL518_REG_TEMP_MAX);
 339 set(TEMP, temp_hyst1, temp_hyst, GL518_REG_TEMP_HYST);
 340 set_bits(BOOL, fan_auto1, fan_auto1, GL518_REG_MISC, 0x08, 3);
 341 set_low(VDD, in_min0, voltage_min[0], GL518_REG_VDD_LIMIT);
 342 set_low(IN, in_min1, voltage_min[1], GL518_REG_VIN1_LIMIT);
 343 set_low(IN, in_min2, voltage_min[2], GL518_REG_VIN2_LIMIT);
 344 set_low(IN, in_min3, voltage_min[3], GL518_REG_VIN3_LIMIT);
 345 set_high(VDD, in_max0, voltage_max[0], GL518_REG_VDD_LIMIT);
 346 set_high(IN, in_max1, voltage_max[1], GL518_REG_VIN1_LIMIT);
 347 set_high(IN, in_max2, voltage_max[2], GL518_REG_VIN2_LIMIT);
 348 set_high(IN, in_max3, voltage_max[3], GL518_REG_VIN3_LIMIT);
 349 set_bits(BOOL, beep_enable, beep_enable, GL518_REG_CONF, 0x04, 2);
 350 set(BEEP_MASK, beep_mask, beep_mask, GL518_REG_ALARM);
 351
 352 static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr,
 353                            const char *buf, size_t count)
 354 {
 355         struct gl518_data *data = dev_get_drvdata(dev);
 356         struct i2c_client *client = data->client;
 357         int nr = to_sensor_dev_attr(attr)->index;
 358         int regvalue;
 359         unsigned long val;
 360         int err;
 361
 362         err = kstrtoul(buf, 10, &val);
 363         if (err)
 364                 return err;
 365
 366         mutex_lock(&data->update_lock);
 367         regvalue = gl518_read_value(client, GL518_REG_FAN_LIMIT);
 368         data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
 369         regvalue = (regvalue & (0xff << (8 * nr)))
 370                  | (data->fan_min[nr] << (8 * (1 - nr)));
 371         gl518_write_value(client, GL518_REG_FAN_LIMIT, regvalue);
 372
 373         data->beep_mask = gl518_read_value(client, GL518_REG_ALARM);
 374         if (data->fan_min[nr] == 0)
 375                 data->alarm_mask &= ~(0x20 << nr);
 376         else
 377                 data->alarm_mask |= (0x20 << nr);
 378         data->beep_mask &= data->alarm_mask;
 379         gl518_write_value(client, GL518_REG_ALARM, data->beep_mask);
 380
 381         mutex_unlock(&data->update_lock);
 382         return count;
 383 }
 384
 385 static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr,
 386                            const char *buf, size_t count)
 387 {
 388         struct gl518_data *data = dev_get_drvdata(dev);
 389         struct i2c_client *client = data->client;
 390         int nr = to_sensor_dev_attr(attr)->index;
 391         int regvalue;
 392         unsigned long val;
 393         int err;
 394
 395         err = kstrtoul(buf, 10, &val);
 396         if (err)
 397                 return err;
 398
 399         switch (val) {
 400         case 1:
 401                 val = 0;
 402                 break;
 403         case 2:
 404                 val = 1;
 405                 break;
 406         case 4:
 407                 val = 2;
 408                 break;
 409         case 8:
 410                 val = 3;
 411                 break;
 412         default:
 413                 dev_err(dev,
 414                         "Invalid fan clock divider %lu, choose one of 1, 2, 4 or 8\n",
 415                         val);
 416                 return -EINVAL;
 417         }
 418
 419         mutex_lock(&data->update_lock);
 420         regvalue = gl518_read_value(client, GL518_REG_MISC);
 421         data->fan_div[nr] = val;
 422         regvalue = (regvalue & ~(0xc0 >> (2 * nr)))
 423                  | (data->fan_div[nr] << (6 - 2 * nr));
 424         gl518_write_value(client, GL518_REG_MISC, regvalue);
 425         mutex_unlock(&data->update_lock);
 426         return count;
 427 }
 428
 429 static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL);
 430 static DEVICE_ATTR(temp1_max, S_IWUSR|S_IRUGO, show_temp_max1, set_temp_max1);
 431 static DEVICE_ATTR(temp1_max_hyst, S_IWUSR|S_IRUGO,
 432         show_temp_hyst1, set_temp_hyst1);
 433 static DEVICE_ATTR(fan1_auto, S_IWUSR|S_IRUGO, show_fan_auto1, set_fan_auto1);
 434 static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan_input, NULL, 0);
 435 static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan_input, NULL, 1);
 436 static SENSOR_DEVICE_ATTR(fan1_min, S_IWUSR|S_IRUGO,
 437         show_fan_min, set_fan_min, 0);
 438 static SENSOR_DEVICE_ATTR(fan2_min, S_IWUSR|S_IRUGO,
 439         show_fan_min, set_fan_min, 1);
 440 static SENSOR_DEVICE_ATTR(fan1_div, S_IWUSR|S_IRUGO,
 441         show_fan_div, set_fan_div, 0);
 442 static SENSOR_DEVICE_ATTR(fan2_div, S_IWUSR|S_IRUGO,
 443         show_fan_div, set_fan_div, 1);
 444 static DEVICE_ATTR(in0_input, S_IRUGO, show_in_input0, NULL);
 445 static DEVICE_ATTR(in1_input, S_IRUGO, show_in_input1, NULL);
 446 static DEVICE_ATTR(in2_input, S_IRUGO, show_in_input2, NULL);
 447 static DEVICE_ATTR(in3_input, S_IRUGO, show_in_input3, NULL);
 448 static DEVICE_ATTR(in0_min, S_IWUSR|S_IRUGO, show_in_min0, set_in_min0);
 449 static DEVICE_ATTR(in1_min, S_IWUSR|S_IRUGO, show_in_min1, set_in_min1);
 450 static DEVICE_ATTR(in2_min, S_IWUSR|S_IRUGO, show_in_min2, set_in_min2);
 451 static DEVICE_ATTR(in3_min, S_IWUSR|S_IRUGO, show_in_min3, set_in_min3);
 452 static DEVICE_ATTR(in0_max, S_IWUSR|S_IRUGO, show_in_max0, set_in_max0);
 453 static DEVICE_ATTR(in1_max, S_IWUSR|S_IRUGO, show_in_max1, set_in_max1);
 454 static DEVICE_ATTR(in2_max, S_IWUSR|S_IRUGO, show_in_max2, set_in_max2);
 455 static DEVICE_ATTR(in3_max, S_IWUSR|S_IRUGO, show_in_max3, set_in_max3);
 456 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
 457 static DEVICE_ATTR(beep_enable, S_IWUSR|S_IRUGO,
 458         show_beep_enable, set_beep_enable);
 459 static DEVICE_ATTR(beep_mask, S_IWUSR|S_IRUGO,
 460         show_beep_mask, set_beep_mask);
 461
 462 static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
 463                           char *buf)
 464 {
 465         int bitnr = to_sensor_dev_attr(attr)->index;
 466         struct gl518_data *data = gl518_update_device(dev);
 467         return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
 468 }
 469
 470 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
 471 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
 472 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
 473 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
 474 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4);
 475 static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 5);
 476 static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 6);
 477
 478 static ssize_t show_beep(struct device *dev, struct device_attribute *attr,
 479                           char *buf)
 480 {
 481         int bitnr = to_sensor_dev_attr(attr)->index;
 482         struct gl518_data *data = gl518_update_device(dev);
 483         return sprintf(buf, "%u\n", (data->beep_mask >> bitnr) & 1);
 484 }
 485
 486 static ssize_t set_beep(struct device *dev, struct device_attribute *attr,
 487                         const char *buf, size_t count)
 488 {
 489         struct gl518_data *data = dev_get_drvdata(dev);
 490         struct i2c_client *client = data->client;
 491         int bitnr = to_sensor_dev_attr(attr)->index;
 492         unsigned long bit;
 493         int err;
 494
 495         err = kstrtoul(buf, 10, &bit);
 496         if (err)
 497                 return err;
 498
 499         if (bit & ~1)
 500                 return -EINVAL;
 501
 502         mutex_lock(&data->update_lock);
 503         data->beep_mask = gl518_read_value(client, GL518_REG_ALARM);
 504         if (bit)
 505                 data->beep_mask |= (1 << bitnr);
 506         else
 507                 data->beep_mask &= ~(1 << bitnr);
 508         gl518_write_value(client, GL518_REG_ALARM, data->beep_mask);
 509         mutex_unlock(&data->update_lock);
 510         return count;
 511 }
 512
 513 static SENSOR_DEVICE_ATTR(in0_beep, S_IRUGO|S_IWUSR, show_beep, set_beep, 0);
 514 static SENSOR_DEVICE_ATTR(in1_beep, S_IRUGO|S_IWUSR, show_beep, set_beep, 1);
 515 static SENSOR_DEVICE_ATTR(in2_beep, S_IRUGO|S_IWUSR, show_beep, set_beep, 2);
 516 static SENSOR_DEVICE_ATTR(in3_beep, S_IRUGO|S_IWUSR, show_beep, set_beep, 3);
 517 static SENSOR_DEVICE_ATTR(temp1_beep, S_IRUGO|S_IWUSR, show_beep, set_beep, 4);
 518 static SENSOR_DEVICE_ATTR(fan1_beep, S_IRUGO|S_IWUSR, show_beep, set_beep, 5);
 519 static SENSOR_DEVICE_ATTR(fan2_beep, S_IRUGO|S_IWUSR, show_beep, set_beep, 6);
 520
 521 static struct attribute *gl518_attributes[] = {
 522         &dev_attr_in3_input.attr,
 523         &dev_attr_in0_min.attr,
 524         &dev_attr_in1_min.attr,
 525         &dev_attr_in2_min.attr,
 526         &dev_attr_in3_min.attr,
 527         &dev_attr_in0_max.attr,
 528         &dev_attr_in1_max.attr,
 529         &dev_attr_in2_max.attr,
 530         &dev_attr_in3_max.attr,
 531         &sensor_dev_attr_in0_alarm.dev_attr.attr,
 532         &sensor_dev_attr_in1_alarm.dev_attr.attr,
 533         &sensor_dev_attr_in2_alarm.dev_attr.attr,
 534         &sensor_dev_attr_in3_alarm.dev_attr.attr,
 535         &sensor_dev_attr_in0_beep.dev_attr.attr,
 536         &sensor_dev_attr_in1_beep.dev_attr.attr,
 537         &sensor_dev_attr_in2_beep.dev_attr.attr,
 538         &sensor_dev_attr_in3_beep.dev_attr.attr,
 539
 540         &dev_attr_fan1_auto.attr,
 541         &sensor_dev_attr_fan1_input.dev_attr.attr,
 542         &sensor_dev_attr_fan2_input.dev_attr.attr,
 543         &sensor_dev_attr_fan1_min.dev_attr.attr,
 544         &sensor_dev_attr_fan2_min.dev_attr.attr,
 545         &sensor_dev_attr_fan1_div.dev_attr.attr,
 546         &sensor_dev_attr_fan2_div.dev_attr.attr,
 547         &sensor_dev_attr_fan1_alarm.dev_attr.attr,
 548         &sensor_dev_attr_fan2_alarm.dev_attr.attr,
 549         &sensor_dev_attr_fan1_beep.dev_attr.attr,
 550         &sensor_dev_attr_fan2_beep.dev_attr.attr,
 551
 552         &dev_attr_temp1_input.attr,
 553         &dev_attr_temp1_max.attr,
 554         &dev_attr_temp1_max_hyst.attr,
 555         &sensor_dev_attr_temp1_alarm.dev_attr.attr,
 556         &sensor_dev_attr_temp1_beep.dev_attr.attr,
 557
 558         &dev_attr_alarms.attr,
 559         &dev_attr_beep_enable.attr,
 560         &dev_attr_beep_mask.attr,
 561         NULL
 562 };
 563
 564 static const struct attribute_group gl518_group = {
 565         .attrs = gl518_attributes,
 566 };
 567
 568 static struct attribute *gl518_attributes_r80[] = {
 569         &dev_attr_in0_input.attr,
 570         &dev_attr_in1_input.attr,
 571         &dev_attr_in2_input.attr,
 572         NULL
 573 };
 574
 575 static const struct attribute_group gl518_group_r80 = {
 576         .attrs = gl518_attributes_r80,
 577 };
 578
 579 /*
 580  * Real code
 581  */
 582
 583 /* Return 0 if detection is successful, -ENODEV otherwise */
 584 static int gl518_detect(struct i2c_client *client, struct i2c_board_info *info)
 585 {
 586         struct i2c_adapter *adapter = client->adapter;
 587         int rev;
 588
 589         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
 590                                      I2C_FUNC_SMBUS_WORD_DATA))
 591                 return -ENODEV;
 592
 593         /* Now, we do the remaining detection. */
 594         if ((gl518_read_value(client, GL518_REG_CHIP_ID) != 0x80)
 595          || (gl518_read_value(client, GL518_REG_CONF) & 0x80))
 596                 return -ENODEV;
 597
 598         /* Determine the chip type. */
 599         rev = gl518_read_value(client, GL518_REG_REVISION);
 600         if (rev != 0x00 && rev != 0x80)
 601                 return -ENODEV;
 602
 603         strlcpy(info->type, "gl518sm", I2C_NAME_SIZE);
 604
 605         return 0;
 606 }
 607
 608 /*
 609  * Called when we have found a new GL518SM.
 610  * Note that we preserve D4:NoFan2 and D2:beep_enable.
 611  */
 612 static void gl518_init_client(struct i2c_client *client)
 613 {
 614         /* Make sure we leave D7:Reset untouched */
 615         u8 regvalue = gl518_read_value(client, GL518_REG_CONF) & 0x7f;
 616
 617         /* Comparator mode (D3=0), standby mode (D6=0) */
 618         gl518_write_value(client, GL518_REG_CONF, (regvalue &= 0x37));
 619
 620         /* Never interrupts */
 621         gl518_write_value(client, GL518_REG_MASK, 0x00);
 622
 623         /* Clear status register (D5=1), start (D6=1) */
 624         gl518_write_value(client, GL518_REG_CONF, 0x20 | regvalue);
 625         gl518_write_value(client, GL518_REG_CONF, 0x40 | regvalue);
 626 }
 627
 628 static int gl518_probe(struct i2c_client *client,
 629                        const struct i2c_device_id *id)
 630 {
 631         struct device *dev = &client->dev;
 632         struct device *hwmon_dev;
 633         struct gl518_data *data;
 634         int revision;
 635
 636         data = devm_kzalloc(dev, sizeof(struct gl518_data), GFP_KERNEL);
 637         if (!data)
 638                 return -ENOMEM;
 639
 640         data->client = client;
 641         revision = gl518_read_value(client, GL518_REG_REVISION);
 642         data->type = revision == 0x80 ? gl518sm_r80 : gl518sm_r00;
 643         mutex_init(&data->update_lock);
 644
 645         /* Initialize the GL518SM chip */
 646         data->alarm_mask = 0xff;
 647         gl518_init_client(client);
 648
 649         /* sysfs hooks */
 650         data->groups[0] = &gl518_group;
 651         if (data->type == gl518sm_r80)
 652                 data->groups[1] = &gl518_group_r80;
 653
 654         hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
 655                                                            data, data->groups);
 656         return PTR_ERR_OR_ZERO(hwmon_dev);
 657 }
 658
 659 static const struct i2c_device_id gl518_id[] = {
 660         { "gl518sm", 0 },
 661         { }
 662 };
 663 MODULE_DEVICE_TABLE(i2c, gl518_id);
 664
 665 static struct i2c_driver gl518_driver = {
 666         .class          = I2C_CLASS_HWMON,
 667         .driver = {
 668                 .name   = "gl518sm",
 669         },
 670         .probe          = gl518_probe,
 671         .id_table       = gl518_id,
 672         .detect         = gl518_detect,
 673         .address_list   = normal_i2c,
 674 };
 675
 676 module_i2c_driver(gl518_driver);
 677
 678 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>, "
 679         "Kyosti Malkki <kmalkki@cc.hut.fi> and "
 680         "Hong-Gunn Chew <hglinux@gunnet.org>");
 681 MODULE_DESCRIPTION("GL518SM driver");
 682 MODULE_LICENSE("GPL");