SAFE public projects git trees. - safe/jmp/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 #include <linux/mutex.h>
  47
  48 /* Addresses to scan */
  49 static unsigned short normal_i2c[] = { 0x2c, 0x2d, I2C_CLIENT_END };
  50
  51 /* Insmod parameters */
  52 I2C_CLIENT_INSMOD_2(gl518sm_r00, gl518sm_r80);
  53
  54 /* Many GL518 constants specified below */
  55
  56 /* The GL518 registers */
  57 #define GL518_REG_CHIP_ID       0x00
  58 #define GL518_REG_REVISION      0x01
  59 #define GL518_REG_VENDOR_ID     0x02
  60 #define GL518_REG_CONF          0x03
  61 #define GL518_REG_TEMP_IN       0x04
  62 #define GL518_REG_TEMP_MAX      0x05
  63 #define GL518_REG_TEMP_HYST     0x06
  64 #define GL518_REG_FAN_COUNT     0x07
  65 #define GL518_REG_FAN_LIMIT     0x08
  66 #define GL518_REG_VIN1_LIMIT    0x09
  67 #define GL518_REG_VIN2_LIMIT    0x0a
  68 #define GL518_REG_VIN3_LIMIT    0x0b
  69 #define GL518_REG_VDD_LIMIT     0x0c
  70 #define GL518_REG_VIN3          0x0d
  71 #define GL518_REG_MISC          0x0f
  72 #define GL518_REG_ALARM         0x10
  73 #define GL518_REG_MASK          0x11
  74 #define GL518_REG_INT           0x12
  75 #define GL518_REG_VIN2          0x13
  76 #define GL518_REG_VIN1          0x14
  77 #define GL518_REG_VDD           0x15
  78
  79
  80 /*
  81  * Conversions. Rounding and limit checking is only done on the TO_REG
  82  * variants. Note that you should be a bit careful with which arguments
  83  * these macros are called: arguments may be evaluated more than once.
  84  * Fixing this is just not worth it.
  85  */
  86
  87 #define RAW_FROM_REG(val)       val
  88
  89 #define BOOL_FROM_REG(val)      ((val)?0:1)
  90 #define BOOL_TO_REG(val)        ((val)?0:1)
  91
  92 #define TEMP_TO_REG(val)        (SENSORS_LIMIT(((((val)<0? \
  93                                 (val)-500:(val)+500)/1000)+119),0,255))
  94 #define TEMP_FROM_REG(val)      (((val) - 119) * 1000)
  95
  96 static inline u8 FAN_TO_REG(long rpm, int div)
  97 {
  98         long rpmdiv;
  99         if (rpm == 0)
 100                 return 0;
 101         rpmdiv = SENSORS_LIMIT(rpm, 1, 1920000) * div;
 102         return SENSORS_LIMIT((960000 + rpmdiv / 2) / rpmdiv, 1, 255);
 103 }
 104 #define FAN_FROM_REG(val,div)   ((val)==0 ? 0 : (960000/((val)*(div))))
 105
 106 #define IN_TO_REG(val)          (SENSORS_LIMIT((((val)+9)/19),0,255))
 107 #define IN_FROM_REG(val)        ((val)*19)
 108
 109 #define VDD_TO_REG(val)         (SENSORS_LIMIT((((val)*4+47)/95),0,255))
 110 #define VDD_FROM_REG(val)       (((val)*95+2)/4)
 111
 112 #define DIV_TO_REG(val)         ((val)==4?2:(val)==2?1:(val)==1?0:3)
 113 #define DIV_FROM_REG(val)       (1 << (val))
 114
 115 #define BEEP_MASK_TO_REG(val)   ((val) & 0x7f & data->alarm_mask)
 116 #define BEEP_MASK_FROM_REG(val) ((val) & 0x7f)
 117
 118 /* Each client has this additional data */
 119 struct gl518_data {
 120         struct i2c_client client;
 121         struct class_device *class_dev;
 122         enum chips type;
 123
 124         struct mutex update_lock;
 125         char valid;             /* !=0 if following fields are valid */
 126         unsigned long last_updated;     /* In jiffies */
 127
 128         u8 voltage_in[4];       /* Register values; [0] = VDD */
 129         u8 voltage_min[4];      /* Register values; [0] = VDD */
 130         u8 voltage_max[4];      /* Register values; [0] = VDD */
 131         u8 iter_voltage_in[4];  /* Register values; [0] = VDD */
 132         u8 fan_in[2];
 133         u8 fan_min[2];
 134         u8 fan_div[2];          /* Register encoding, shifted right */
 135         u8 fan_auto1;           /* Boolean */
 136         u8 temp_in;             /* Register values */
 137         u8 temp_max;            /* Register values */
 138         u8 temp_hyst;           /* Register values */
 139         u8 alarms;              /* Register value */
 140         u8 alarm_mask;          /* Register value */
 141         u8 beep_mask;           /* Register value */
 142         u8 beep_enable;         /* Boolean */
 143 };
 144
 145 static int gl518_attach_adapter(struct i2c_adapter *adapter);
 146 static int gl518_detect(struct i2c_adapter *adapter, int address, int kind);
 147 static void gl518_init_client(struct i2c_client *client);
 148 static int gl518_detach_client(struct i2c_client *client);
 149 static int gl518_read_value(struct i2c_client *client, u8 reg);
 150 static int gl518_write_value(struct i2c_client *client, u8 reg, u16 value);
 151 static struct gl518_data *gl518_update_device(struct device *dev);
 152
 153 /* This is the driver that will be inserted */
 154 static struct i2c_driver gl518_driver = {
 155         .driver = {
 156                 .name   = "gl518sm",
 157         },
 158         .id             = I2C_DRIVERID_GL518,
 159         .attach_adapter = gl518_attach_adapter,
 160         .detach_client  = gl518_detach_client,
 161 };
 162
 163 /*
 164  * Sysfs stuff
 165  */
 166
 167 #define show(type, suffix, value)                                       \
 168 static ssize_t show_##suffix(struct device *dev, struct device_attribute *attr, char *buf)              \
 169 {                                                                       \
 170         struct gl518_data *data = gl518_update_device(dev);             \
 171         return sprintf(buf, "%d\n", type##_FROM_REG(data->value));      \
 172 }
 173
 174 #define show_fan(suffix, value, index)                                  \
 175 static ssize_t show_##suffix(struct device *dev, struct device_attribute *attr, char *buf)              \
 176 {                                                                       \
 177         struct gl518_data *data = gl518_update_device(dev);             \
 178         return sprintf(buf, "%d\n", FAN_FROM_REG(data->value[index],    \
 179                 DIV_FROM_REG(data->fan_div[index])));                   \
 180 }
 181
 182 show(TEMP, temp_input1, temp_in);
 183 show(TEMP, temp_max1, temp_max);
 184 show(TEMP, temp_hyst1, temp_hyst);
 185 show(BOOL, fan_auto1, fan_auto1);
 186 show_fan(fan_input1, fan_in, 0);
 187 show_fan(fan_input2, fan_in, 1);
 188 show_fan(fan_min1, fan_min, 0);
 189 show_fan(fan_min2, fan_min, 1);
 190 show(DIV, fan_div1, fan_div[0]);
 191 show(DIV, fan_div2, fan_div[1]);
 192 show(VDD, in_input0, voltage_in[0]);
 193 show(IN, in_input1, voltage_in[1]);
 194 show(IN, in_input2, voltage_in[2]);
 195 show(IN, in_input3, voltage_in[3]);
 196 show(VDD, in_min0, voltage_min[0]);
 197 show(IN, in_min1, voltage_min[1]);
 198 show(IN, in_min2, voltage_min[2]);
 199 show(IN, in_min3, voltage_min[3]);
 200 show(VDD, in_max0, voltage_max[0]);
 201 show(IN, in_max1, voltage_max[1]);
 202 show(IN, in_max2, voltage_max[2]);
 203 show(IN, in_max3, voltage_max[3]);
 204 show(RAW, alarms, alarms);
 205 show(BOOL, beep_enable, beep_enable);
 206 show(BEEP_MASK, beep_mask, beep_mask);
 207
 208 #define set(type, suffix, value, reg)                                   \
 209 static ssize_t set_##suffix(struct device *dev, struct device_attribute *attr, const char *buf, \
 210         size_t count)                                                   \
 211 {                                                                       \
 212         struct i2c_client *client = to_i2c_client(dev);                 \
 213         struct gl518_data *data = i2c_get_clientdata(client);           \
 214         long val = simple_strtol(buf, NULL, 10);                        \
 215                                                                         \
 216         mutex_lock(&data->update_lock);                                 \
 217         data->value = type##_TO_REG(val);                               \
 218         gl518_write_value(client, reg, data->value);                    \
 219         mutex_unlock(&data->update_lock);                               \
 220         return count;                                                   \
 221 }
 222
 223 #define set_bits(type, suffix, value, reg, mask, shift)                 \
 224 static ssize_t set_##suffix(struct device *dev, struct device_attribute *attr, const char *buf, \
 225         size_t count)                                                   \
 226 {                                                                       \
 227         struct i2c_client *client = to_i2c_client(dev);                 \
 228         struct gl518_data *data = i2c_get_clientdata(client);           \
 229         int regvalue;                                                   \
 230         unsigned long val = simple_strtoul(buf, NULL, 10);              \
 231                                                                         \
 232         mutex_lock(&data->update_lock);                                 \
 233         regvalue = gl518_read_value(client, reg);                       \
 234         data->value = type##_TO_REG(val);                               \
 235         regvalue = (regvalue & ~mask) | (data->value << shift);         \
 236         gl518_write_value(client, reg, regvalue);                       \
 237         mutex_unlock(&data->update_lock);                               \
 238         return count;                                                   \
 239 }
 240
 241 #define set_low(type, suffix, value, reg)                               \
 242         set_bits(type, suffix, value, reg, 0x00ff, 0)
 243 #define set_high(type, suffix, value, reg)                              \
 244         set_bits(type, suffix, value, reg, 0xff00, 8)
 245
 246 set(TEMP, temp_max1, temp_max, GL518_REG_TEMP_MAX);
 247 set(TEMP, temp_hyst1, temp_hyst, GL518_REG_TEMP_HYST);
 248 set_bits(BOOL, fan_auto1, fan_auto1, GL518_REG_MISC, 0x08, 3);
 249 set_bits(DIV, fan_div1, fan_div[0], GL518_REG_MISC, 0xc0, 6);
 250 set_bits(DIV, fan_div2, fan_div[1], GL518_REG_MISC, 0x30, 4);
 251 set_low(VDD, in_min0, voltage_min[0], GL518_REG_VDD_LIMIT);
 252 set_low(IN, in_min1, voltage_min[1], GL518_REG_VIN1_LIMIT);
 253 set_low(IN, in_min2, voltage_min[2], GL518_REG_VIN2_LIMIT);
 254 set_low(IN, in_min3, voltage_min[3], GL518_REG_VIN3_LIMIT);
 255 set_high(VDD, in_max0, voltage_max[0], GL518_REG_VDD_LIMIT);
 256 set_high(IN, in_max1, voltage_max[1], GL518_REG_VIN1_LIMIT);
 257 set_high(IN, in_max2, voltage_max[2], GL518_REG_VIN2_LIMIT);
 258 set_high(IN, in_max3, voltage_max[3], GL518_REG_VIN3_LIMIT);
 259 set_bits(BOOL, beep_enable, beep_enable, GL518_REG_CONF, 0x04, 2);
 260 set(BEEP_MASK, beep_mask, beep_mask, GL518_REG_ALARM);
 261
 262 static ssize_t set_fan_min1(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 263 {
 264         struct i2c_client *client = to_i2c_client(dev);
 265         struct gl518_data *data = i2c_get_clientdata(client);
 266         int regvalue;
 267         unsigned long val = simple_strtoul(buf, NULL, 10);
 268
 269         mutex_lock(&data->update_lock);
 270         regvalue = gl518_read_value(client, GL518_REG_FAN_LIMIT);
 271         data->fan_min[0] = FAN_TO_REG(val,
 272                 DIV_FROM_REG(data->fan_div[0]));
 273         regvalue = (regvalue & 0x00ff) | (data->fan_min[0] << 8);
 274         gl518_write_value(client, GL518_REG_FAN_LIMIT, regvalue);
 275
 276         data->beep_mask = gl518_read_value(client, GL518_REG_ALARM);
 277         if (data->fan_min[0] == 0)
 278                 data->alarm_mask &= ~0x20;
 279         else
 280                 data->alarm_mask |= 0x20;
 281         data->beep_mask &= data->alarm_mask;
 282         gl518_write_value(client, GL518_REG_ALARM, data->beep_mask);
 283
 284         mutex_unlock(&data->update_lock);
 285         return count;
 286 }
 287
 288 static ssize_t set_fan_min2(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 289 {
 290         struct i2c_client *client = to_i2c_client(dev);
 291         struct gl518_data *data = i2c_get_clientdata(client);
 292         int regvalue;
 293         unsigned long val = simple_strtoul(buf, NULL, 10);
 294
 295         mutex_lock(&data->update_lock);
 296         regvalue = gl518_read_value(client, GL518_REG_FAN_LIMIT);
 297         data->fan_min[1] = FAN_TO_REG(val,
 298                 DIV_FROM_REG(data->fan_div[1]));
 299         regvalue = (regvalue & 0xff00) | data->fan_min[1];
 300         gl518_write_value(client, GL518_REG_FAN_LIMIT, regvalue);
 301
 302         data->beep_mask = gl518_read_value(client, GL518_REG_ALARM);
 303         if (data->fan_min[1] == 0)
 304                 data->alarm_mask &= ~0x40;
 305         else
 306                 data->alarm_mask |= 0x40;
 307         data->beep_mask &= data->alarm_mask;
 308         gl518_write_value(client, GL518_REG_ALARM, data->beep_mask);
 309
 310         mutex_unlock(&data->update_lock);
 311         return count;
 312 }
 313
 314 static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL);
 315 static DEVICE_ATTR(temp1_max, S_IWUSR|S_IRUGO, show_temp_max1, set_temp_max1);
 316 static DEVICE_ATTR(temp1_max_hyst, S_IWUSR|S_IRUGO,
 317         show_temp_hyst1, set_temp_hyst1);
 318 static DEVICE_ATTR(fan1_auto, S_IWUSR|S_IRUGO, show_fan_auto1, set_fan_auto1);
 319 static DEVICE_ATTR(fan1_input, S_IRUGO, show_fan_input1, NULL);
 320 static DEVICE_ATTR(fan2_input, S_IRUGO, show_fan_input2, NULL);
 321 static DEVICE_ATTR(fan1_min, S_IWUSR|S_IRUGO, show_fan_min1, set_fan_min1);
 322 static DEVICE_ATTR(fan2_min, S_IWUSR|S_IRUGO, show_fan_min2, set_fan_min2);
 323 static DEVICE_ATTR(fan1_div, S_IWUSR|S_IRUGO, show_fan_div1, set_fan_div1);
 324 static DEVICE_ATTR(fan2_div, S_IWUSR|S_IRUGO, show_fan_div2, set_fan_div2);
 325 static DEVICE_ATTR(in0_input, S_IRUGO, show_in_input0, NULL);
 326 static DEVICE_ATTR(in1_input, S_IRUGO, show_in_input1, NULL);
 327 static DEVICE_ATTR(in2_input, S_IRUGO, show_in_input2, NULL);
 328 static DEVICE_ATTR(in3_input, S_IRUGO, show_in_input3, NULL);
 329 static DEVICE_ATTR(in0_min, S_IWUSR|S_IRUGO, show_in_min0, set_in_min0);
 330 static DEVICE_ATTR(in1_min, S_IWUSR|S_IRUGO, show_in_min1, set_in_min1);
 331 static DEVICE_ATTR(in2_min, S_IWUSR|S_IRUGO, show_in_min2, set_in_min2);
 332 static DEVICE_ATTR(in3_min, S_IWUSR|S_IRUGO, show_in_min3, set_in_min3);
 333 static DEVICE_ATTR(in0_max, S_IWUSR|S_IRUGO, show_in_max0, set_in_max0);
 334 static DEVICE_ATTR(in1_max, S_IWUSR|S_IRUGO, show_in_max1, set_in_max1);
 335 static DEVICE_ATTR(in2_max, S_IWUSR|S_IRUGO, show_in_max2, set_in_max2);
 336 static DEVICE_ATTR(in3_max, S_IWUSR|S_IRUGO, show_in_max3, set_in_max3);
 337 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
 338 static DEVICE_ATTR(beep_enable, S_IWUSR|S_IRUGO,
 339         show_beep_enable, set_beep_enable);
 340 static DEVICE_ATTR(beep_mask, S_IWUSR|S_IRUGO,
 341         show_beep_mask, set_beep_mask);
 342
 343 /*
 344  * Real code
 345  */
 346
 347 static int gl518_attach_adapter(struct i2c_adapter *adapter)
 348 {
 349         if (!(adapter->class & I2C_CLASS_HWMON))
 350                 return 0;
 351         return i2c_probe(adapter, &addr_data, gl518_detect);
 352 }
 353
 354 static int gl518_detect(struct i2c_adapter *adapter, int address, int kind)
 355 {
 356         int i;
 357         struct i2c_client *new_client;
 358         struct gl518_data *data;
 359         int err = 0;
 360
 361         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
 362                                      I2C_FUNC_SMBUS_WORD_DATA))
 363                 goto exit;
 364
 365         /* OK. For now, we presume we have a valid client. We now create the
 366            client structure, even though we cannot fill it completely yet.
 367            But it allows us to access gl518_{read,write}_value. */
 368
 369         if (!(data = kzalloc(sizeof(struct gl518_data), GFP_KERNEL))) {
 370                 err = -ENOMEM;
 371                 goto exit;
 372         }
 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         mutex_init(&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         mutex_lock(&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         mutex_unlock(&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);