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 <khali@linux-fr.org>
   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 device *hwmon_dev;
 118         enum chips type;
 119
 120         struct mutex update_lock;
 121         char valid;             /* !=0 if following fields are valid */
 122         unsigned long last_updated;     /* In jiffies */
 123
 124         u8 voltage_in[4];       /* Register values; [0] = VDD */
 125         u8 voltage_min[4];      /* Register values; [0] = VDD */
 126         u8 voltage_max[4];      /* Register values; [0] = VDD */
 127         u8 fan_in[2];
 128         u8 fan_min[2];
 129         u8 fan_div[2];          /* Register encoding, shifted right */
 130         u8 fan_auto1;           /* Boolean */
 131         u8 temp_in;             /* Register values */
 132         u8 temp_max;            /* Register values */
 133         u8 temp_hyst;           /* Register values */
 134         u8 alarms;              /* Register value */
 135         u8 alarm_mask;
 136         u8 beep_mask;           /* Register value */
 137         u8 beep_enable;         /* Boolean */
 138 };
 139
 140 static int gl518_probe(struct i2c_client *client,
 141                        const struct i2c_device_id *id);
 142 static int gl518_detect(struct i2c_client *client, struct i2c_board_info *info);
 143 static void gl518_init_client(struct i2c_client *client);
 144 static int gl518_remove(struct i2c_client *client);
 145 static int gl518_read_value(struct i2c_client *client, u8 reg);
 146 static int gl518_write_value(struct i2c_client *client, u8 reg, u16 value);
 147 static struct gl518_data *gl518_update_device(struct device *dev);
 148
 149 static const struct i2c_device_id gl518_id[] = {
 150         { "gl518sm", 0 },
 151         { }
 152 };
 153 MODULE_DEVICE_TABLE(i2c, gl518_id);
 154
 155 /* This is the driver that will be inserted */
 156 static struct i2c_driver gl518_driver = {
 157         .class          = I2C_CLASS_HWMON,
 158         .driver = {
 159                 .name   = "gl518sm",
 160         },
 161         .probe          = gl518_probe,
 162         .remove         = gl518_remove,
 163         .id_table       = gl518_id,
 164         .detect         = gl518_detect,
 165         .address_list   = normal_i2c,
 166 };
 167
 168 /*
 169  * Sysfs stuff
 170  */
 171
 172 #define show(type, suffix, value)                                       \
 173 static ssize_t show_##suffix(struct device *dev,                        \
 174                              struct device_attribute *attr, char *buf)  \
 175 {                                                                       \
 176         struct gl518_data *data = gl518_update_device(dev);             \
 177         return sprintf(buf, "%d\n", type##_FROM_REG(data->value));      \
 178 }
 179
 180 show(TEMP, temp_input1, temp_in);
 181 show(TEMP, temp_max1, temp_max);
 182 show(TEMP, temp_hyst1, temp_hyst);
 183 show(BOOL, fan_auto1, fan_auto1);
 184 show(VDD, in_input0, voltage_in[0]);
 185 show(IN, in_input1, voltage_in[1]);
 186 show(IN, in_input2, voltage_in[2]);
 187 show(IN, in_input3, voltage_in[3]);
 188 show(VDD, in_min0, voltage_min[0]);
 189 show(IN, in_min1, voltage_min[1]);
 190 show(IN, in_min2, voltage_min[2]);
 191 show(IN, in_min3, voltage_min[3]);
 192 show(VDD, in_max0, voltage_max[0]);
 193 show(IN, in_max1, voltage_max[1]);
 194 show(IN, in_max2, voltage_max[2]);
 195 show(IN, in_max3, voltage_max[3]);
 196 show(RAW, alarms, alarms);
 197 show(BOOL, beep_enable, beep_enable);
 198 show(BEEP_MASK, beep_mask, beep_mask);
 199
 200 static ssize_t show_fan_input(struct device *dev,
 201                               struct device_attribute *attr, char *buf)
 202 {
 203         int nr = to_sensor_dev_attr(attr)->index;
 204         struct gl518_data *data = gl518_update_device(dev);
 205         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_in[nr],
 206                                         DIV_FROM_REG(data->fan_div[nr])));
 207 }
 208
 209 static ssize_t show_fan_min(struct device *dev,
 210                             struct device_attribute *attr, char *buf)
 211 {
 212         int nr = to_sensor_dev_attr(attr)->index;
 213         struct gl518_data *data = gl518_update_device(dev);
 214         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[nr],
 215                                         DIV_FROM_REG(data->fan_div[nr])));
 216 }
 217
 218 static ssize_t show_fan_div(struct device *dev,
 219                             struct device_attribute *attr, char *buf)
 220 {
 221         int nr = to_sensor_dev_attr(attr)->index;
 222         struct gl518_data *data = gl518_update_device(dev);
 223         return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]));
 224 }
 225
 226 #define set(type, suffix, value, reg)                                   \
 227 static ssize_t set_##suffix(struct device *dev,                         \
 228                             struct device_attribute *attr,              \
 229                             const char *buf, size_t count)              \
 230 {                                                                       \
 231         struct i2c_client *client = to_i2c_client(dev);                 \
 232         struct gl518_data *data = i2c_get_clientdata(client);           \
 233         long val;                                                       \
 234         int err = kstrtol(buf, 10, &val);                               \
 235         if (err)                                                        \
 236                 return err;                                             \
 237                                                                         \
 238         mutex_lock(&data->update_lock);                                 \
 239         data->value = type##_TO_REG(val);                               \
 240         gl518_write_value(client, reg, data->value);                    \
 241         mutex_unlock(&data->update_lock);                               \
 242         return count;                                                   \
 243 }
 244
 245 #define set_bits(type, suffix, value, reg, mask, shift)                 \
 246 static ssize_t set_##suffix(struct device *dev,                         \
 247                             struct device_attribute *attr,              \
 248                             const char *buf, size_t count)              \
 249 {                                                                       \
 250         struct i2c_client *client = to_i2c_client(dev);                 \
 251         struct gl518_data *data = i2c_get_clientdata(client);           \
 252         int regvalue;                                                   \
 253         unsigned long val;                                              \
 254         int err = kstrtoul(buf, 10, &val);                              \
 255         if (err)                                                        \
 256                 return err;                                             \
 257                                                                         \
 258         mutex_lock(&data->update_lock);                                 \
 259         regvalue = gl518_read_value(client, reg);                       \
 260         data->value = type##_TO_REG(val);                               \
 261         regvalue = (regvalue & ~mask) | (data->value << shift);         \
 262         gl518_write_value(client, reg, regvalue);                       \
 263         mutex_unlock(&data->update_lock);                               \
 264         return count;                                                   \
 265 }
 266
 267 #define set_low(type, suffix, value, reg)                               \
 268         set_bits(type, suffix, value, reg, 0x00ff, 0)
 269 #define set_high(type, suffix, value, reg)                              \
 270         set_bits(type, suffix, value, reg, 0xff00, 8)
 271
 272 set(TEMP, temp_max1, temp_max, GL518_REG_TEMP_MAX);
 273 set(TEMP, temp_hyst1, temp_hyst, GL518_REG_TEMP_HYST);
 274 set_bits(BOOL, fan_auto1, fan_auto1, GL518_REG_MISC, 0x08, 3);
 275 set_low(VDD, in_min0, voltage_min[0], GL518_REG_VDD_LIMIT);
 276 set_low(IN, in_min1, voltage_min[1], GL518_REG_VIN1_LIMIT);
 277 set_low(IN, in_min2, voltage_min[2], GL518_REG_VIN2_LIMIT);
 278 set_low(IN, in_min3, voltage_min[3], GL518_REG_VIN3_LIMIT);
 279 set_high(VDD, in_max0, voltage_max[0], GL518_REG_VDD_LIMIT);
 280 set_high(IN, in_max1, voltage_max[1], GL518_REG_VIN1_LIMIT);
 281 set_high(IN, in_max2, voltage_max[2], GL518_REG_VIN2_LIMIT);
 282 set_high(IN, in_max3, voltage_max[3], GL518_REG_VIN3_LIMIT);
 283 set_bits(BOOL, beep_enable, beep_enable, GL518_REG_CONF, 0x04, 2);
 284 set(BEEP_MASK, beep_mask, beep_mask, GL518_REG_ALARM);
 285
 286 static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr,
 287                            const char *buf, size_t count)
 288 {
 289         struct i2c_client *client = to_i2c_client(dev);
 290         struct gl518_data *data = i2c_get_clientdata(client);
 291         int nr = to_sensor_dev_attr(attr)->index;
 292         int regvalue;
 293         unsigned long val;
 294         int err;
 295
 296         err = kstrtoul(buf, 10, &val);
 297         if (err)
 298                 return err;
 299
 300         mutex_lock(&data->update_lock);
 301         regvalue = gl518_read_value(client, GL518_REG_FAN_LIMIT);
 302         data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
 303         regvalue = (regvalue & (0xff << (8 * nr)))
 304                  | (data->fan_min[nr] << (8 * (1 - nr)));
 305         gl518_write_value(client, GL518_REG_FAN_LIMIT, regvalue);
 306
 307         data->beep_mask = gl518_read_value(client, GL518_REG_ALARM);
 308         if (data->fan_min[nr] == 0)
 309                 data->alarm_mask &= ~(0x20 << nr);
 310         else
 311                 data->alarm_mask |= (0x20 << nr);
 312         data->beep_mask &= data->alarm_mask;
 313         gl518_write_value(client, GL518_REG_ALARM, data->beep_mask);
 314
 315         mutex_unlock(&data->update_lock);
 316         return count;
 317 }
 318
 319 static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr,
 320                            const char *buf, size_t count)
 321 {
 322         struct i2c_client *client = to_i2c_client(dev);
 323         struct gl518_data *data = i2c_get_clientdata(client);
 324         int nr = to_sensor_dev_attr(attr)->index;
 325         int regvalue;
 326         unsigned long val;
 327         int err;
 328
 329         err = kstrtoul(buf, 10, &val);
 330         if (err)
 331                 return err;
 332
 333         switch (val) {
 334         case 1:
 335                 val = 0;
 336                 break;
 337         case 2:
 338                 val = 1;
 339                 break;
 340         case 4:
 341                 val = 2;
 342                 break;
 343         case 8:
 344                 val = 3;
 345                 break;
 346         default:
 347                 dev_err(dev, "Invalid fan clock divider %lu, choose one "
 348                         "of 1, 2, 4 or 8\n", val);
 349                 return -EINVAL;
 350         }
 351
 352         mutex_lock(&data->update_lock);
 353         regvalue = gl518_read_value(client, GL518_REG_MISC);
 354         data->fan_div[nr] = val;
 355         regvalue = (regvalue & ~(0xc0 >> (2 * nr)))
 356                  | (data->fan_div[nr] << (6 - 2 * nr));
 357         gl518_write_value(client, GL518_REG_MISC, regvalue);
 358         mutex_unlock(&data->update_lock);
 359         return count;
 360 }
 361
 362 static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL);
 363 static DEVICE_ATTR(temp1_max, S_IWUSR|S_IRUGO, show_temp_max1, set_temp_max1);
 364 static DEVICE_ATTR(temp1_max_hyst, S_IWUSR|S_IRUGO,
 365         show_temp_hyst1, set_temp_hyst1);
 366 static DEVICE_ATTR(fan1_auto, S_IWUSR|S_IRUGO, show_fan_auto1, set_fan_auto1);
 367 static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan_input, NULL, 0);
 368 static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan_input, NULL, 1);
 369 static SENSOR_DEVICE_ATTR(fan1_min, S_IWUSR|S_IRUGO,
 370         show_fan_min, set_fan_min, 0);
 371 static SENSOR_DEVICE_ATTR(fan2_min, S_IWUSR|S_IRUGO,
 372         show_fan_min, set_fan_min, 1);
 373 static SENSOR_DEVICE_ATTR(fan1_div, S_IWUSR|S_IRUGO,
 374         show_fan_div, set_fan_div, 0);
 375 static SENSOR_DEVICE_ATTR(fan2_div, S_IWUSR|S_IRUGO,
 376         show_fan_div, set_fan_div, 1);
 377 static DEVICE_ATTR(in0_input, S_IRUGO, show_in_input0, NULL);
 378 static DEVICE_ATTR(in1_input, S_IRUGO, show_in_input1, NULL);
 379 static DEVICE_ATTR(in2_input, S_IRUGO, show_in_input2, NULL);
 380 static DEVICE_ATTR(in3_input, S_IRUGO, show_in_input3, NULL);
 381 static DEVICE_ATTR(in0_min, S_IWUSR|S_IRUGO, show_in_min0, set_in_min0);
 382 static DEVICE_ATTR(in1_min, S_IWUSR|S_IRUGO, show_in_min1, set_in_min1);
 383 static DEVICE_ATTR(in2_min, S_IWUSR|S_IRUGO, show_in_min2, set_in_min2);
 384 static DEVICE_ATTR(in3_min, S_IWUSR|S_IRUGO, show_in_min3, set_in_min3);
 385 static DEVICE_ATTR(in0_max, S_IWUSR|S_IRUGO, show_in_max0, set_in_max0);
 386 static DEVICE_ATTR(in1_max, S_IWUSR|S_IRUGO, show_in_max1, set_in_max1);
 387 static DEVICE_ATTR(in2_max, S_IWUSR|S_IRUGO, show_in_max2, set_in_max2);
 388 static DEVICE_ATTR(in3_max, S_IWUSR|S_IRUGO, show_in_max3, set_in_max3);
 389 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
 390 static DEVICE_ATTR(beep_enable, S_IWUSR|S_IRUGO,
 391         show_beep_enable, set_beep_enable);
 392 static DEVICE_ATTR(beep_mask, S_IWUSR|S_IRUGO,
 393         show_beep_mask, set_beep_mask);
 394
 395 static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
 396                           char *buf)
 397 {
 398         int bitnr = to_sensor_dev_attr(attr)->index;
 399         struct gl518_data *data = gl518_update_device(dev);
 400         return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
 401 }
 402
 403 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
 404 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
 405 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
 406 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
 407 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4);
 408 static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 5);
 409 static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 6);
 410
 411 static ssize_t show_beep(struct device *dev, struct device_attribute *attr,
 412                           char *buf)
 413 {
 414         int bitnr = to_sensor_dev_attr(attr)->index;
 415         struct gl518_data *data = gl518_update_device(dev);
 416         return sprintf(buf, "%u\n", (data->beep_mask >> bitnr) & 1);
 417 }
 418
 419 static ssize_t set_beep(struct device *dev, struct device_attribute *attr,
 420                         const char *buf, size_t count)
 421 {
 422         struct i2c_client *client = to_i2c_client(dev);
 423         struct gl518_data *data = i2c_get_clientdata(client);
 424         int bitnr = to_sensor_dev_attr(attr)->index;
 425         unsigned long bit;
 426         int err;
 427
 428         err = kstrtoul(buf, 10, &bit);
 429         if (err)
 430                 return err;
 431
 432         if (bit & ~1)
 433                 return -EINVAL;
 434
 435         mutex_lock(&data->update_lock);
 436         data->beep_mask = gl518_read_value(client, GL518_REG_ALARM);
 437         if (bit)
 438                 data->beep_mask |= (1 << bitnr);
 439         else
 440                 data->beep_mask &= ~(1 << bitnr);
 441         gl518_write_value(client, GL518_REG_ALARM, data->beep_mask);
 442         mutex_unlock(&data->update_lock);
 443         return count;
 444 }
 445
 446 static SENSOR_DEVICE_ATTR(in0_beep, S_IRUGO|S_IWUSR, show_beep, set_beep, 0);
 447 static SENSOR_DEVICE_ATTR(in1_beep, S_IRUGO|S_IWUSR, show_beep, set_beep, 1);
 448 static SENSOR_DEVICE_ATTR(in2_beep, S_IRUGO|S_IWUSR, show_beep, set_beep, 2);
 449 static SENSOR_DEVICE_ATTR(in3_beep, S_IRUGO|S_IWUSR, show_beep, set_beep, 3);
 450 static SENSOR_DEVICE_ATTR(temp1_beep, S_IRUGO|S_IWUSR, show_beep, set_beep, 4);
 451 static SENSOR_DEVICE_ATTR(fan1_beep, S_IRUGO|S_IWUSR, show_beep, set_beep, 5);
 452 static SENSOR_DEVICE_ATTR(fan2_beep, S_IRUGO|S_IWUSR, show_beep, set_beep, 6);
 453
 454 static struct attribute *gl518_attributes[] = {
 455         &dev_attr_in3_input.attr,
 456         &dev_attr_in0_min.attr,
 457         &dev_attr_in1_min.attr,
 458         &dev_attr_in2_min.attr,
 459         &dev_attr_in3_min.attr,
 460         &dev_attr_in0_max.attr,
 461         &dev_attr_in1_max.attr,
 462         &dev_attr_in2_max.attr,
 463         &dev_attr_in3_max.attr,
 464         &sensor_dev_attr_in0_alarm.dev_attr.attr,
 465         &sensor_dev_attr_in1_alarm.dev_attr.attr,
 466         &sensor_dev_attr_in2_alarm.dev_attr.attr,
 467         &sensor_dev_attr_in3_alarm.dev_attr.attr,
 468         &sensor_dev_attr_in0_beep.dev_attr.attr,
 469         &sensor_dev_attr_in1_beep.dev_attr.attr,
 470         &sensor_dev_attr_in2_beep.dev_attr.attr,
 471         &sensor_dev_attr_in3_beep.dev_attr.attr,
 472
 473         &dev_attr_fan1_auto.attr,
 474         &sensor_dev_attr_fan1_input.dev_attr.attr,
 475         &sensor_dev_attr_fan2_input.dev_attr.attr,
 476         &sensor_dev_attr_fan1_min.dev_attr.attr,
 477         &sensor_dev_attr_fan2_min.dev_attr.attr,
 478         &sensor_dev_attr_fan1_div.dev_attr.attr,
 479         &sensor_dev_attr_fan2_div.dev_attr.attr,
 480         &sensor_dev_attr_fan1_alarm.dev_attr.attr,
 481         &sensor_dev_attr_fan2_alarm.dev_attr.attr,
 482         &sensor_dev_attr_fan1_beep.dev_attr.attr,
 483         &sensor_dev_attr_fan2_beep.dev_attr.attr,
 484
 485         &dev_attr_temp1_input.attr,
 486         &dev_attr_temp1_max.attr,
 487         &dev_attr_temp1_max_hyst.attr,
 488         &sensor_dev_attr_temp1_alarm.dev_attr.attr,
 489         &sensor_dev_attr_temp1_beep.dev_attr.attr,
 490
 491         &dev_attr_alarms.attr,
 492         &dev_attr_beep_enable.attr,
 493         &dev_attr_beep_mask.attr,
 494         NULL
 495 };
 496
 497 static const struct attribute_group gl518_group = {
 498         .attrs = gl518_attributes,
 499 };
 500
 501 static struct attribute *gl518_attributes_r80[] = {
 502         &dev_attr_in0_input.attr,
 503         &dev_attr_in1_input.attr,
 504         &dev_attr_in2_input.attr,
 505         NULL
 506 };
 507
 508 static const struct attribute_group gl518_group_r80 = {
 509         .attrs = gl518_attributes_r80,
 510 };
 511
 512 /*
 513  * Real code
 514  */
 515
 516 /* Return 0 if detection is successful, -ENODEV otherwise */
 517 static int gl518_detect(struct i2c_client *client, struct i2c_board_info *info)
 518 {
 519         struct i2c_adapter *adapter = client->adapter;
 520         int rev;
 521
 522         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
 523                                      I2C_FUNC_SMBUS_WORD_DATA))
 524                 return -ENODEV;
 525
 526         /* Now, we do the remaining detection. */
 527         if ((gl518_read_value(client, GL518_REG_CHIP_ID) != 0x80)
 528          || (gl518_read_value(client, GL518_REG_CONF) & 0x80))
 529                 return -ENODEV;
 530
 531         /* Determine the chip type. */
 532         rev = gl518_read_value(client, GL518_REG_REVISION);
 533         if (rev != 0x00 && rev != 0x80)
 534                 return -ENODEV;
 535
 536         strlcpy(info->type, "gl518sm", I2C_NAME_SIZE);
 537
 538         return 0;
 539 }
 540
 541 static int gl518_probe(struct i2c_client *client,
 542                        const struct i2c_device_id *id)
 543 {
 544         struct gl518_data *data;
 545         int err, revision;
 546
 547         data = devm_kzalloc(&client->dev, sizeof(struct gl518_data),
 548                             GFP_KERNEL);
 549         if (!data)
 550                 return -ENOMEM;
 551
 552         i2c_set_clientdata(client, data);
 553         revision = gl518_read_value(client, GL518_REG_REVISION);
 554         data->type = revision == 0x80 ? gl518sm_r80 : gl518sm_r00;
 555         mutex_init(&data->update_lock);
 556
 557         /* Initialize the GL518SM chip */
 558         data->alarm_mask = 0xff;
 559         gl518_init_client(client);
 560
 561         /* Register sysfs hooks */
 562         err = sysfs_create_group(&client->dev.kobj, &gl518_group);
 563         if (err)
 564                 return err;
 565         if (data->type == gl518sm_r80) {
 566                 err = sysfs_create_group(&client->dev.kobj, &gl518_group_r80);
 567                 if (err)
 568                         goto exit_remove_files;
 569         }
 570
 571         data->hwmon_dev = hwmon_device_register(&client->dev);
 572         if (IS_ERR(data->hwmon_dev)) {
 573                 err = PTR_ERR(data->hwmon_dev);
 574                 goto exit_remove_files;
 575         }
 576
 577         return 0;
 578
 579 exit_remove_files:
 580         sysfs_remove_group(&client->dev.kobj, &gl518_group);
 581         if (data->type == gl518sm_r80)
 582                 sysfs_remove_group(&client->dev.kobj, &gl518_group_r80);
 583         return err;
 584 }
 585
 586
 587 /*
 588  * Called when we have found a new GL518SM.
 589  * Note that we preserve D4:NoFan2 and D2:beep_enable.
 590  */
 591 static void gl518_init_client(struct i2c_client *client)
 592 {
 593         /* Make sure we leave D7:Reset untouched */
 594         u8 regvalue = gl518_read_value(client, GL518_REG_CONF) & 0x7f;
 595
 596         /* Comparator mode (D3=0), standby mode (D6=0) */
 597         gl518_write_value(client, GL518_REG_CONF, (regvalue &= 0x37));
 598
 599         /* Never interrupts */
 600         gl518_write_value(client, GL518_REG_MASK, 0x00);
 601
 602         /* Clear status register (D5=1), start (D6=1) */
 603         gl518_write_value(client, GL518_REG_CONF, 0x20 | regvalue);
 604         gl518_write_value(client, GL518_REG_CONF, 0x40 | regvalue);
 605 }
 606
 607 static int gl518_remove(struct i2c_client *client)
 608 {
 609         struct gl518_data *data = i2c_get_clientdata(client);
 610
 611         hwmon_device_unregister(data->hwmon_dev);
 612         sysfs_remove_group(&client->dev.kobj, &gl518_group);
 613         if (data->type == gl518sm_r80)
 614                 sysfs_remove_group(&client->dev.kobj, &gl518_group_r80);
 615
 616         return 0;
 617 }
 618
 619 /*
 620  * Registers 0x07 to 0x0c are word-sized, others are byte-sized
 621  * GL518 uses a high-byte first convention, which is exactly opposite to
 622  * the SMBus standard.
 623  */
 624 static int gl518_read_value(struct i2c_client *client, u8 reg)
 625 {
 626         if ((reg >= 0x07) && (reg <= 0x0c))
 627                 return i2c_smbus_read_word_swapped(client, reg);
 628         else
 629                 return i2c_smbus_read_byte_data(client, reg);
 630 }
 631
 632 static int gl518_write_value(struct i2c_client *client, u8 reg, u16 value)
 633 {
 634         if ((reg >= 0x07) && (reg <= 0x0c))
 635                 return i2c_smbus_write_word_swapped(client, reg, value);
 636         else
 637                 return i2c_smbus_write_byte_data(client, reg, value);
 638 }
 639
 640 static struct gl518_data *gl518_update_device(struct device *dev)
 641 {
 642         struct i2c_client *client = to_i2c_client(dev);
 643         struct gl518_data *data = i2c_get_clientdata(client);
 644         int val;
 645
 646         mutex_lock(&data->update_lock);
 647
 648         if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
 649             || !data->valid) {
 650                 dev_dbg(&client->dev, "Starting gl518 update\n");
 651
 652                 data->alarms = gl518_read_value(client, GL518_REG_INT);
 653                 data->beep_mask = gl518_read_value(client, GL518_REG_ALARM);
 654
 655                 val = gl518_read_value(client, GL518_REG_VDD_LIMIT);
 656                 data->voltage_min[0] = val & 0xff;
 657                 data->voltage_max[0] = (val >> 8) & 0xff;
 658                 val = gl518_read_value(client, GL518_REG_VIN1_LIMIT);
 659                 data->voltage_min[1] = val & 0xff;
 660                 data->voltage_max[1] = (val >> 8) & 0xff;
 661                 val = gl518_read_value(client, GL518_REG_VIN2_LIMIT);
 662                 data->voltage_min[2] = val & 0xff;
 663                 data->voltage_max[2] = (val >> 8) & 0xff;
 664                 val = gl518_read_value(client, GL518_REG_VIN3_LIMIT);
 665                 data->voltage_min[3] = val & 0xff;
 666                 data->voltage_max[3] = (val >> 8) & 0xff;
 667
 668                 val = gl518_read_value(client, GL518_REG_FAN_COUNT);
 669                 data->fan_in[0] = (val >> 8) & 0xff;
 670                 data->fan_in[1] = val & 0xff;
 671
 672                 val = gl518_read_value(client, GL518_REG_FAN_LIMIT);
 673                 data->fan_min[0] = (val >> 8) & 0xff;
 674                 data->fan_min[1] = val & 0xff;
 675
 676                 data->temp_in = gl518_read_value(client, GL518_REG_TEMP_IN);
 677                 data->temp_max =
 678                     gl518_read_value(client, GL518_REG_TEMP_MAX);
 679                 data->temp_hyst =
 680                     gl518_read_value(client, GL518_REG_TEMP_HYST);
 681
 682                 val = gl518_read_value(client, GL518_REG_MISC);
 683                 data->fan_div[0] = (val >> 6) & 0x03;
 684                 data->fan_div[1] = (val >> 4) & 0x03;
 685                 data->fan_auto1  = (val >> 3) & 0x01;
 686
 687                 data->alarms &= data->alarm_mask;
 688
 689                 val = gl518_read_value(client, GL518_REG_CONF);
 690                 data->beep_enable = (val >> 2) & 1;
 691
 692                 if (data->type != gl518sm_r00) {
 693                         data->voltage_in[0] =
 694                             gl518_read_value(client, GL518_REG_VDD);
 695                         data->voltage_in[1] =
 696                             gl518_read_value(client, GL518_REG_VIN1);
 697                         data->voltage_in[2] =
 698                             gl518_read_value(client, GL518_REG_VIN2);
 699                 }
 700                 data->voltage_in[3] =
 701                     gl518_read_value(client, GL518_REG_VIN3);
 702
 703                 data->last_updated = jiffies;
 704                 data->valid = 1;
 705         }
 706
 707         mutex_unlock(&data->update_lock);
 708
 709         return data;
 710 }
 711
 712 module_i2c_driver(gl518_driver);
 713
 714 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>, "
 715         "Kyosti Malkki <kmalkki@cc.hut.fi> and "
 716         "Hong-Gunn Chew <hglinux@gunnet.org>");
 717 MODULE_DESCRIPTION("GL518SM driver");
 718 MODULE_LICENSE("GPL");