git.oblomov.eu Git - linux-2.6/blob - 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  * History:
  35  * 2004-01-28  Original port. (Hong-Gunn Chew)
  36  * 2004-01-31  Code review and approval. (Jean Delvare)
  37  */
  38
  39 #include <linux/module.h>
  40 #include <linux/init.h>
  41 #include <linux/slab.h>
  42 #include <linux/jiffies.h>
  43 #include <linux/i2c.h>
  44 #include <linux/hwmon.h>
  45 #include <linux/err.h>
  46
  47 /* Addresses to scan */
  48 static unsigned short normal_i2c[] = { 0x2c, 0x2d, I2C_CLIENT_END };
  49
  50 /* Insmod parameters */
  51 I2C_CLIENT_INSMOD_2(gl518sm_r00, gl518sm_r80);
  52
  53 /* Many GL518 constants specified below */
  54
  55 /* The GL518 registers */
  56 #define GL518_REG_CHIP_ID       0x00
  57 #define GL518_REG_REVISION      0x01
  58 #define GL518_REG_VENDOR_ID     0x02
  59 #define GL518_REG_CONF          0x03
  60 #define GL518_REG_TEMP_IN       0x04
  61 #define GL518_REG_TEMP_MAX      0x05
  62 #define GL518_REG_TEMP_HYST     0x06
  63 #define GL518_REG_FAN_COUNT     0x07
  64 #define GL518_REG_FAN_LIMIT     0x08
  65 #define GL518_REG_VIN1_LIMIT    0x09
  66 #define GL518_REG_VIN2_LIMIT    0x0a
  67 #define GL518_REG_VIN3_LIMIT    0x0b
  68 #define GL518_REG_VDD_LIMIT     0x0c
  69 #define GL518_REG_VIN3          0x0d
  70 #define GL518_REG_MISC          0x0f
  71 #define GL518_REG_ALARM         0x10
  72 #define GL518_REG_MASK          0x11
  73 #define GL518_REG_INT           0x12
  74 #define GL518_REG_VIN2          0x13
  75 #define GL518_REG_VIN1          0x14
  76 #define GL518_REG_VDD           0x15
  77
  78
  79 /*
  80  * Conversions. Rounding and limit checking is only done on the TO_REG
  81  * variants. Note that you should be a bit careful with which arguments
  82  * these macros are called: arguments may be evaluated more than once.
  83  * Fixing this is just not worth it.
  84  */
  85
  86 #define RAW_FROM_REG(val)       val
  87
  88 #define BOOL_FROM_REG(val)      ((val)?0:1)
  89 #define BOOL_TO_REG(val)        ((val)?0:1)
  90
  91 #define TEMP_TO_REG(val)        (SENSORS_LIMIT(((((val)<0? \
  92                                 (val)-500:(val)+500)/1000)+119),0,255))
  93 #define TEMP_FROM_REG(val)      (((val) - 119) * 1000)
  94
  95 static inline u8 FAN_TO_REG(long rpm, int div)
  96 {
  97         long rpmdiv;
  98         if (rpm == 0)
  99                 return 0;
 100         rpmdiv = SENSORS_LIMIT(rpm, 1, 1920000) * div;
 101         return SENSORS_LIMIT((960000 + rpmdiv / 2) / rpmdiv, 1, 255);
 102 }
 103 #define FAN_FROM_REG(val,div)   ((val)==0 ? 0 : (960000/((val)*(div))))
 104
 105 #define IN_TO_REG(val)          (SENSORS_LIMIT((((val)+9)/19),0,255))
 106 #define IN_FROM_REG(val)        ((val)*19)
 107
 108 #define VDD_TO_REG(val)         (SENSORS_LIMIT((((val)*4+47)/95),0,255))
 109 #define VDD_FROM_REG(val)       (((val)*95+2)/4)
 110
 111 #define DIV_TO_REG(val)         ((val)==4?2:(val)==2?1:(val)==1?0:3)
 112 #define DIV_FROM_REG(val)       (1 << (val))
 113
 114 #define BEEP_MASK_TO_REG(val)   ((val) & 0x7f & data->alarm_mask)
 115 #define BEEP_MASK_FROM_REG(val) ((val) & 0x7f)
 116
 117 /* Each client has this additional data */
 118 struct gl518_data {
 119         struct i2c_client client;
 120         struct class_device *class_dev;
 121         enum chips type;
 122
 123         struct semaphore update_lock;
 124         char valid;             /* !=0 if following fields are valid */
 125         unsigned long last_updated;     /* In jiffies */
 126
 127         u8 voltage_in[4];       /* Register values; [0] = VDD */
 128         u8 voltage_min[4];      /* Register values; [0] = VDD */
 129         u8 voltage_max[4];      /* Register values; [0] = VDD */
 130         u8 iter_voltage_in[4];  /* Register values; [0] = VDD */
 131         u8 fan_in[2];
 132         u8 fan_min[2];
 133         u8 fan_div[2];          /* Register encoding, shifted right */
 134         u8 fan_auto1;           /* Boolean */
 135         u8 temp_in;             /* Register values */
 136         u8 temp_max;            /* Register values */
 137         u8 temp_hyst;           /* Register values */
 138         u8 alarms;              /* Register value */
 139         u8 alarm_mask;          /* Register value */
 140         u8 beep_mask;           /* Register value */
 141         u8 beep_enable;         /* Boolean */
 142 };
 143
 144 static int gl518_attach_adapter(struct i2c_adapter *adapter);
 145 static int gl518_detect(struct i2c_adapter *adapter, int address, int kind);
 146 static void gl518_init_client(struct i2c_client *client);
 147 static int gl518_detach_client(struct i2c_client *client);
 148 static int gl518_read_value(struct i2c_client *client, u8 reg);
 149 static int gl518_write_value(struct i2c_client *client, u8 reg, u16 value);
 150 static struct gl518_data *gl518_update_device(struct device *dev);
 151
 152 /* This is the driver that will be inserted */
 153 static struct i2c_driver gl518_driver = {
 154         .owner          = THIS_MODULE,
 155         .name           = "gl518sm",
 156         .id             = I2C_DRIVERID_GL518,
 157         .flags          = I2C_DF_NOTIFY,
 158         .attach_adapter = gl518_attach_adapter,
 159         .detach_client  = gl518_detach_client,
 160 };
 161
 162 /*
 163  * Sysfs stuff
 164  */
 165
 166 #define show(type, suffix, value)                                       \
 167 static ssize_t show_##suffix(struct device *dev, struct device_attribute *attr, char *buf)              \
 168 {                                                                       \
 169         struct gl518_data *data = gl518_update_device(dev);             \
 170         return sprintf(buf, "%d\n", type##_FROM_REG(data->value));      \
 171 }
 172
 173 #define show_fan(suffix, value, index)                                  \
 174 static ssize_t show_##suffix(struct device *dev, struct device_attribute *attr, char *buf)              \
 175 {                                                                       \
 176         struct gl518_data *data = gl518_update_device(dev);             \
 177         return sprintf(buf, "%d\n", FAN_FROM_REG(data->value[index],    \
 178                 DIV_FROM_REG(data->fan_div[index])));                   \
 179 }
 180
 181 show(TEMP, temp_input1, temp_in);
 182 show(TEMP, temp_max1, temp_max);
 183 show(TEMP, temp_hyst1, temp_hyst);
 184 show(BOOL, fan_auto1, fan_auto1);
 185 show_fan(fan_input1, fan_in, 0);
 186 show_fan(fan_input2, fan_in, 1);
 187 show_fan(fan_min1, fan_min, 0);
 188 show_fan(fan_min2, fan_min, 1);
 189 show(DIV, fan_div1, fan_div[0]);
 190 show(DIV, fan_div2, fan_div[1]);
 191 show(VDD, in_input0, voltage_in[0]);
 192 show(IN, in_input1, voltage_in[1]);
 193 show(IN, in_input2, voltage_in[2]);
 194 show(IN, in_input3, voltage_in[3]);
 195 show(VDD, in_min0, voltage_min[0]);
 196 show(IN, in_min1, voltage_min[1]);
 197 show(IN, in_min2, voltage_min[2]);
 198 show(IN, in_min3, voltage_min[3]);
 199 show(VDD, in_max0, voltage_max[0]);
 200 show(IN, in_max1, voltage_max[1]);
 201 show(IN, in_max2, voltage_max[2]);
 202 show(IN, in_max3, voltage_max[3]);
 203 show(RAW, alarms, alarms);
 204 show(BOOL, beep_enable, beep_enable);
 205 show(BEEP_MASK, beep_mask, beep_mask);
 206
 207 #define set(type, suffix, value, reg)                                   \
 208 static ssize_t set_##suffix(struct device *dev, struct device_attribute *attr, const char *buf, \
 209         size_t count)                                                   \
 210 {                                                                       \
 211         struct i2c_client *client = to_i2c_client(dev);                 \
 212         struct gl518_data *data = i2c_get_clientdata(client);           \
 213         long val = simple_strtol(buf, NULL, 10);                        \
 214                                                                         \
 215         down(&data->update_lock);                                       \
 216         data->value = type##_TO_REG(val);                               \
 217         gl518_write_value(client, reg, data->value);                    \
 218         up(&data->update_lock);                                         \
 219         return count;                                                   \
 220 }
 221
 222 #define set_bits(type, suffix, value, reg, mask, shift)                 \
 223 static ssize_t set_##suffix(struct device *dev, struct device_attribute *attr, const char *buf, \
 224         size_t count)                                                   \
 225 {                                                                       \
 226         struct i2c_client *client = to_i2c_client(dev);                 \
 227         struct gl518_data *data = i2c_get_clientdata(client);           \
 228         int regvalue;                                                   \
 229         unsigned long val = simple_strtoul(buf, NULL, 10);              \
 230                                                                         \
 231         down(&data->update_lock);                                       \
 232         regvalue = gl518_read_value(client, reg);                       \
 233         data->value = type##_TO_REG(val);                               \
 234         regvalue = (regvalue & ~mask) | (data->value << shift);         \
 235         gl518_write_value(client, reg, regvalue);                       \
 236         up(&data->update_lock);                                         \
 237         return count;                                                   \
 238 }
 239
 240 #define set_low(type, suffix, value, reg)                               \
 241         set_bits(type, suffix, value, reg, 0x00ff, 0)
 242 #define set_high(type, suffix, value, reg)                              \
 243         set_bits(type, suffix, value, reg, 0xff00, 8)
 244
 245 set(TEMP, temp_max1, temp_max, GL518_REG_TEMP_MAX);
 246 set(TEMP, temp_hyst1, temp_hyst, GL518_REG_TEMP_HYST);
 247 set_bits(BOOL, fan_auto1, fan_auto1, GL518_REG_MISC, 0x08, 3);
 248 set_bits(DIV, fan_div1, fan_div[0], GL518_REG_MISC, 0xc0, 6);
 249 set_bits(DIV, fan_div2, fan_div[1], GL518_REG_MISC, 0x30, 4);
 250 set_low(VDD, in_min0, voltage_min[0], GL518_REG_VDD_LIMIT);
 251 set_low(IN, in_min1, voltage_min[1], GL518_REG_VIN1_LIMIT);
 252 set_low(IN, in_min2, voltage_min[2], GL518_REG_VIN2_LIMIT);
 253 set_low(IN, in_min3, voltage_min[3], GL518_REG_VIN3_LIMIT);
 254 set_high(VDD, in_max0, voltage_max[0], GL518_REG_VDD_LIMIT);
 255 set_high(IN, in_max1, voltage_max[1], GL518_REG_VIN1_LIMIT);
 256 set_high(IN, in_max2, voltage_max[2], GL518_REG_VIN2_LIMIT);
 257 set_high(IN, in_max3, voltage_max[3], GL518_REG_VIN3_LIMIT);
 258 set_bits(BOOL, beep_enable, beep_enable, GL518_REG_CONF, 0x04, 2);
 259 set(BEEP_MASK, beep_mask, beep_mask, GL518_REG_ALARM);
 260
 261 static ssize_t set_fan_min1(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 262 {
 263         struct i2c_client *client = to_i2c_client(dev);
 264         struct gl518_data *data = i2c_get_clientdata(client);
 265         int regvalue;
 266         unsigned long val = simple_strtoul(buf, NULL, 10);
 267
 268         down(&data->update_lock);
 269         regvalue = gl518_read_value(client, GL518_REG_FAN_LIMIT);
 270         data->fan_min[0] = FAN_TO_REG(val,
 271                 DIV_FROM_REG(data->fan_div[0]));
 272         regvalue = (regvalue & 0x00ff) | (data->fan_min[0] << 8);
 273         gl518_write_value(client, GL518_REG_FAN_LIMIT, regvalue);
 274
 275         data->beep_mask = gl518_read_value(client, GL518_REG_ALARM);
 276         if (data->fan_min[0] == 0)
 277                 data->alarm_mask &= ~0x20;
 278         else
 279                 data->alarm_mask |= 0x20;
 280         data->beep_mask &= data->alarm_mask;
 281         gl518_write_value(client, GL518_REG_ALARM, data->beep_mask);
 282
 283         up(&data->update_lock);
 284         return count;
 285 }
 286
 287 static ssize_t set_fan_min2(struct device *dev, struct device_attribute *attr, 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 regvalue;
 292         unsigned long val = simple_strtoul(buf, NULL, 10);
 293
 294         down(&data->update_lock);
 295         regvalue = gl518_read_value(client, GL518_REG_FAN_LIMIT);
 296         data->fan_min[1] = FAN_TO_REG(val,
 297                 DIV_FROM_REG(data->fan_div[1]));
 298         regvalue = (regvalue & 0xff00) | data->fan_min[1];
 299         gl518_write_value(client, GL518_REG_FAN_LIMIT, regvalue);
 300
 301         data->beep_mask = gl518_read_value(client, GL518_REG_ALARM);
 302         if (data->fan_min[1] == 0)
 303                 data->alarm_mask &= ~0x40;
 304         else
 305                 data->alarm_mask |= 0x40;
 306         data->beep_mask &= data->alarm_mask;
 307         gl518_write_value(client, GL518_REG_ALARM, data->beep_mask);
 308
 309         up(&data->update_lock);
 310         return count;
 311 }
 312
 313 static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL);
 314 static DEVICE_ATTR(temp1_max, S_IWUSR|S_IRUGO, show_temp_max1, set_temp_max1);
 315 static DEVICE_ATTR(temp1_max_hyst, S_IWUSR|S_IRUGO,
 316         show_temp_hyst1, set_temp_hyst1);
 317 static DEVICE_ATTR(fan1_auto, S_IWUSR|S_IRUGO, show_fan_auto1, set_fan_auto1);
 318 static DEVICE_ATTR(fan1_input, S_IRUGO, show_fan_input1, NULL);
 319 static DEVICE_ATTR(fan2_input, S_IRUGO, show_fan_input2, NULL);
 320 static DEVICE_ATTR(fan1_min, S_IWUSR|S_IRUGO, show_fan_min1, set_fan_min1);
 321 static DEVICE_ATTR(fan2_min, S_IWUSR|S_IRUGO, show_fan_min2, set_fan_min2);
 322 static DEVICE_ATTR(fan1_div, S_IWUSR|S_IRUGO, show_fan_div1, set_fan_div1);
 323 static DEVICE_ATTR(fan2_div, S_IWUSR|S_IRUGO, show_fan_div2, set_fan_div2);
 324 static DEVICE_ATTR(in0_input, S_IRUGO, show_in_input0, NULL);
 325 static DEVICE_ATTR(in1_input, S_IRUGO, show_in_input1, NULL);
 326 static DEVICE_ATTR(in2_input, S_IRUGO, show_in_input2, NULL);
 327 static DEVICE_ATTR(in3_input, S_IRUGO, show_in_input3, NULL);
 328 static DEVICE_ATTR(in0_min, S_IWUSR|S_IRUGO, show_in_min0, set_in_min0);
 329 static DEVICE_ATTR(in1_min, S_IWUSR|S_IRUGO, show_in_min1, set_in_min1);
 330 static DEVICE_ATTR(in2_min, S_IWUSR|S_IRUGO, show_in_min2, set_in_min2);
 331 static DEVICE_ATTR(in3_min, S_IWUSR|S_IRUGO, show_in_min3, set_in_min3);
 332 static DEVICE_ATTR(in0_max, S_IWUSR|S_IRUGO, show_in_max0, set_in_max0);
 333 static DEVICE_ATTR(in1_max, S_IWUSR|S_IRUGO, show_in_max1, set_in_max1);
 334 static DEVICE_ATTR(in2_max, S_IWUSR|S_IRUGO, show_in_max2, set_in_max2);
 335 static DEVICE_ATTR(in3_max, S_IWUSR|S_IRUGO, show_in_max3, set_in_max3);
 336 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
 337 static DEVICE_ATTR(beep_enable, S_IWUSR|S_IRUGO,
 338         show_beep_enable, set_beep_enable);
 339 static DEVICE_ATTR(beep_mask, S_IWUSR|S_IRUGO,
 340         show_beep_mask, set_beep_mask);
 341
 342 /*
 343  * Real code
 344  */
 345
 346 static int gl518_attach_adapter(struct i2c_adapter *adapter)
 347 {
 348         if (!(adapter->class & I2C_CLASS_HWMON))
 349                 return 0;
 350         return i2c_probe(adapter, &addr_data, gl518_detect);
 351 }
 352
 353 static int gl518_detect(struct i2c_adapter *adapter, int address, int kind)
 354 {
 355         int i;
 356         struct i2c_client *new_client;
 357         struct gl518_data *data;
 358         int err = 0;
 359
 360         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
 361                                      I2C_FUNC_SMBUS_WORD_DATA))
 362                 goto exit;
 363
 364         /* OK. For now, we presume we have a valid client. We now create the
 365            client structure, even though we cannot fill it completely yet.
 366            But it allows us to access gl518_{read,write}_value. */
 367
 368         if (!(data = kmalloc(sizeof(struct gl518_data), GFP_KERNEL))) {
 369                 err = -ENOMEM;
 370                 goto exit;
 371         }
 372         memset(data, 0, sizeof(struct gl518_data));
 373
 374         new_client = &data->client;
 375         i2c_set_clientdata(new_client, data);
 376
 377         new_client->addr = address;
 378         new_client->adapter = adapter;
 379         new_client->driver = &gl518_driver;
 380         new_client->flags = 0;
 381
 382         /* Now, we do the remaining detection. */
 383
 384         if (kind < 0) {
 385                 if ((gl518_read_value(new_client, GL518_REG_CHIP_ID) != 0x80)
 386                  || (gl518_read_value(new_client, GL518_REG_CONF) & 0x80))
 387                         goto exit_free;
 388         }
 389
 390         /* Determine the chip type. */
 391         if (kind <= 0) {
 392                 i = gl518_read_value(new_client, GL518_REG_REVISION);
 393                 if (i == 0x00) {
 394                         kind = gl518sm_r00;
 395                 } else if (i == 0x80) {
 396                         kind = gl518sm_r80;
 397                 } else {
 398                         if (kind <= 0)
 399                                 dev_info(&adapter->dev,
 400                                     "Ignoring 'force' parameter for unknown "
 401                                     "chip at adapter %d, address 0x%02x\n",
 402                                     i2c_adapter_id(adapter), address);
 403                         goto exit_free;
 404                 }
 405         }
 406
 407         /* Fill in the remaining client fields */
 408         strlcpy(new_client->name, "gl518sm", I2C_NAME_SIZE);
 409         data->type = kind;
 410         data->valid = 0;
 411         init_MUTEX(&data->update_lock);
 412
 413         /* Tell the I2C layer a new client has arrived */
 414         if ((err = i2c_attach_client(new_client)))
 415                 goto exit_free;
 416
 417         /* Initialize the GL518SM chip */
 418         data->alarm_mask = 0xff;
 419         data->voltage_in[0]=data->voltage_in[1]=data->voltage_in[2]=0;
 420         gl518_init_client((struct i2c_client *) new_client);
 421
 422         /* Register sysfs hooks */
 423         data->class_dev = hwmon_device_register(&new_client->dev);
 424         if (IS_ERR(data->class_dev)) {
 425                 err = PTR_ERR(data->class_dev);
 426                 goto exit_detach;
 427         }
 428
 429         device_create_file(&new_client->dev, &dev_attr_in0_input);
 430         device_create_file(&new_client->dev, &dev_attr_in1_input);
 431         device_create_file(&new_client->dev, &dev_attr_in2_input);
 432         device_create_file(&new_client->dev, &dev_attr_in3_input);
 433         device_create_file(&new_client->dev, &dev_attr_in0_min);
 434         device_create_file(&new_client->dev, &dev_attr_in1_min);
 435         device_create_file(&new_client->dev, &dev_attr_in2_min);
 436         device_create_file(&new_client->dev, &dev_attr_in3_min);
 437         device_create_file(&new_client->dev, &dev_attr_in0_max);
 438         device_create_file(&new_client->dev, &dev_attr_in1_max);
 439         device_create_file(&new_client->dev, &dev_attr_in2_max);
 440         device_create_file(&new_client->dev, &dev_attr_in3_max);
 441         device_create_file(&new_client->dev, &dev_attr_fan1_auto);
 442         device_create_file(&new_client->dev, &dev_attr_fan1_input);
 443         device_create_file(&new_client->dev, &dev_attr_fan2_input);
 444         device_create_file(&new_client->dev, &dev_attr_fan1_min);
 445         device_create_file(&new_client->dev, &dev_attr_fan2_min);
 446         device_create_file(&new_client->dev, &dev_attr_fan1_div);
 447         device_create_file(&new_client->dev, &dev_attr_fan2_div);
 448         device_create_file(&new_client->dev, &dev_attr_temp1_input);
 449         device_create_file(&new_client->dev, &dev_attr_temp1_max);
 450         device_create_file(&new_client->dev, &dev_attr_temp1_max_hyst);
 451         device_create_file(&new_client->dev, &dev_attr_alarms);
 452         device_create_file(&new_client->dev, &dev_attr_beep_enable);
 453         device_create_file(&new_client->dev, &dev_attr_beep_mask);
 454
 455         return 0;
 456
 457 /* OK, this is not exactly good programming practice, usually. But it is
 458    very code-efficient in this case. */
 459
 460 exit_detach:
 461         i2c_detach_client(new_client);
 462 exit_free:
 463         kfree(data);
 464 exit:
 465         return err;
 466 }
 467
 468
 469 /* Called when we have found a new GL518SM.
 470    Note that we preserve D4:NoFan2 and D2:beep_enable. */
 471 static void gl518_init_client(struct i2c_client *client)
 472 {
 473         /* Make sure we leave D7:Reset untouched */
 474         u8 regvalue = gl518_read_value(client, GL518_REG_CONF) & 0x7f;
 475
 476         /* Comparator mode (D3=0), standby mode (D6=0) */
 477         gl518_write_value(client, GL518_REG_CONF, (regvalue &= 0x37));
 478
 479         /* Never interrupts */
 480         gl518_write_value(client, GL518_REG_MASK, 0x00);
 481
 482         /* Clear status register (D5=1), start (D6=1) */
 483         gl518_write_value(client, GL518_REG_CONF, 0x20 | regvalue);
 484         gl518_write_value(client, GL518_REG_CONF, 0x40 | regvalue);
 485 }
 486
 487 static int gl518_detach_client(struct i2c_client *client)
 488 {
 489         struct gl518_data *data = i2c_get_clientdata(client);
 490         int err;
 491
 492         hwmon_device_unregister(data->class_dev);
 493
 494         if ((err = i2c_detach_client(client)))
 495                 return err;
 496
 497         kfree(data);
 498         return 0;
 499 }
 500
 501 /* Registers 0x07 to 0x0c are word-sized, others are byte-sized
 502    GL518 uses a high-byte first convention, which is exactly opposite to
 503    the usual practice. */
 504 static int gl518_read_value(struct i2c_client *client, u8 reg)
 505 {
 506         if ((reg >= 0x07) && (reg <= 0x0c))
 507                 return swab16(i2c_smbus_read_word_data(client, reg));
 508         else
 509                 return i2c_smbus_read_byte_data(client, reg);
 510 }
 511
 512 /* Registers 0x07 to 0x0c are word-sized, others are byte-sized
 513    GL518 uses a high-byte first convention, which is exactly opposite to
 514    the usual practice. */
 515 static int gl518_write_value(struct i2c_client *client, u8 reg, u16 value)
 516 {
 517         if ((reg >= 0x07) && (reg <= 0x0c))
 518                 return i2c_smbus_write_word_data(client, reg, swab16(value));
 519         else
 520                 return i2c_smbus_write_byte_data(client, reg, value);
 521 }
 522
 523 static struct gl518_data *gl518_update_device(struct device *dev)
 524 {
 525         struct i2c_client *client = to_i2c_client(dev);
 526         struct gl518_data *data = i2c_get_clientdata(client);
 527         int val;
 528
 529         down(&data->update_lock);
 530
 531         if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
 532             || !data->valid) {
 533                 dev_dbg(&client->dev, "Starting gl518 update\n");
 534
 535                 data->alarms = gl518_read_value(client, GL518_REG_INT);
 536                 data->beep_mask = gl518_read_value(client, GL518_REG_ALARM);
 537
 538                 val = gl518_read_value(client, GL518_REG_VDD_LIMIT);
 539                 data->voltage_min[0] = val & 0xff;
 540                 data->voltage_max[0] = (val >> 8) & 0xff;
 541                 val = gl518_read_value(client, GL518_REG_VIN1_LIMIT);
 542                 data->voltage_min[1] = val & 0xff;
 543                 data->voltage_max[1] = (val >> 8) & 0xff;
 544                 val = gl518_read_value(client, GL518_REG_VIN2_LIMIT);
 545                 data->voltage_min[2] = val & 0xff;
 546                 data->voltage_max[2] = (val >> 8) & 0xff;
 547                 val = gl518_read_value(client, GL518_REG_VIN3_LIMIT);
 548                 data->voltage_min[3] = val & 0xff;
 549                 data->voltage_max[3] = (val >> 8) & 0xff;
 550
 551                 val = gl518_read_value(client, GL518_REG_FAN_COUNT);
 552                 data->fan_in[0] = (val >> 8) & 0xff;
 553                 data->fan_in[1] = val & 0xff;
 554
 555                 val = gl518_read_value(client, GL518_REG_FAN_LIMIT);
 556                 data->fan_min[0] = (val >> 8) & 0xff;
 557                 data->fan_min[1] = val & 0xff;
 558
 559                 data->temp_in = gl518_read_value(client, GL518_REG_TEMP_IN);
 560                 data->temp_max =
 561                     gl518_read_value(client, GL518_REG_TEMP_MAX);
 562                 data->temp_hyst =
 563                     gl518_read_value(client, GL518_REG_TEMP_HYST);
 564
 565                 val = gl518_read_value(client, GL518_REG_MISC);
 566                 data->fan_div[0] = (val >> 6) & 0x03;
 567                 data->fan_div[1] = (val >> 4) & 0x03;
 568                 data->fan_auto1  = (val >> 3) & 0x01;
 569
 570                 data->alarms &= data->alarm_mask;
 571
 572                 val = gl518_read_value(client, GL518_REG_CONF);
 573                 data->beep_enable = (val >> 2) & 1;
 574
 575                 if (data->type != gl518sm_r00) {
 576                         data->voltage_in[0] =
 577                             gl518_read_value(client, GL518_REG_VDD);
 578                         data->voltage_in[1] =
 579                             gl518_read_value(client, GL518_REG_VIN1);
 580                         data->voltage_in[2] =
 581                             gl518_read_value(client, GL518_REG_VIN2);
 582                 }
 583                 data->voltage_in[3] =
 584                     gl518_read_value(client, GL518_REG_VIN3);
 585
 586                 data->last_updated = jiffies;
 587                 data->valid = 1;
 588         }
 589
 590         up(&data->update_lock);
 591
 592         return data;
 593 }
 594
 595 static int __init sensors_gl518sm_init(void)
 596 {
 597         return i2c_add_driver(&gl518_driver);
 598 }
 599
 600 static void __exit sensors_gl518sm_exit(void)
 601 {
 602         i2c_del_driver(&gl518_driver);
 603 }
 604
 605 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>, "
 606         "Kyosti Malkki <kmalkki@cc.hut.fi> and "
 607         "Hong-Gunn Chew <hglinux@gunnet.org>");
 608 MODULE_DESCRIPTION("GL518SM driver");
 609 MODULE_LICENSE("GPL");
 610
 611 module_init(sensors_gl518sm_init);
 612 module_exit(sensors_gl518sm_exit);