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 #include <linux/sysfs.h>
  48
  49 /* Addresses to scan */
  50 static unsigned short normal_i2c[] = { 0x2c, 0x2d, I2C_CLIENT_END };
  51
  52 /* Insmod parameters */
  53 I2C_CLIENT_INSMOD_2(gl518sm_r00, gl518sm_r80);
  54
  55 /* Many GL518 constants specified below */
  56
  57 /* The GL518 registers */
  58 #define GL518_REG_CHIP_ID       0x00
  59 #define GL518_REG_REVISION      0x01
  60 #define GL518_REG_VENDOR_ID     0x02
  61 #define GL518_REG_CONF          0x03
  62 #define GL518_REG_TEMP_IN       0x04
  63 #define GL518_REG_TEMP_MAX      0x05
  64 #define GL518_REG_TEMP_HYST     0x06
  65 #define GL518_REG_FAN_COUNT     0x07
  66 #define GL518_REG_FAN_LIMIT     0x08
  67 #define GL518_REG_VIN1_LIMIT    0x09
  68 #define GL518_REG_VIN2_LIMIT    0x0a
  69 #define GL518_REG_VIN3_LIMIT    0x0b
  70 #define GL518_REG_VDD_LIMIT     0x0c
  71 #define GL518_REG_VIN3          0x0d
  72 #define GL518_REG_MISC          0x0f
  73 #define GL518_REG_ALARM         0x10
  74 #define GL518_REG_MASK          0x11
  75 #define GL518_REG_INT           0x12
  76 #define GL518_REG_VIN2          0x13
  77 #define GL518_REG_VIN1          0x14
  78 #define GL518_REG_VDD           0x15
  79
  80
  81 /*
  82  * Conversions. Rounding and limit checking is only done on the TO_REG
  83  * variants. Note that you should be a bit careful with which arguments
  84  * these macros are called: arguments may be evaluated more than once.
  85  * Fixing this is just not worth it.
  86  */
  87
  88 #define RAW_FROM_REG(val)       val
  89
  90 #define BOOL_FROM_REG(val)      ((val)?0:1)
  91 #define BOOL_TO_REG(val)        ((val)?0:1)
  92
  93 #define TEMP_TO_REG(val)        (SENSORS_LIMIT(((((val)<0? \
  94                                 (val)-500:(val)+500)/1000)+119),0,255))
  95 #define TEMP_FROM_REG(val)      (((val) - 119) * 1000)
  96
  97 static inline u8 FAN_TO_REG(long rpm, int div)
  98 {
  99         long rpmdiv;
 100         if (rpm == 0)
 101                 return 0;
 102         rpmdiv = SENSORS_LIMIT(rpm, 1, 1920000) * div;
 103         return SENSORS_LIMIT((960000 + rpmdiv / 2) / rpmdiv, 1, 255);
 104 }
 105 #define FAN_FROM_REG(val,div)   ((val)==0 ? 0 : (960000/((val)*(div))))
 106
 107 #define IN_TO_REG(val)          (SENSORS_LIMIT((((val)+9)/19),0,255))
 108 #define IN_FROM_REG(val)        ((val)*19)
 109
 110 #define VDD_TO_REG(val)         (SENSORS_LIMIT((((val)*4+47)/95),0,255))
 111 #define VDD_FROM_REG(val)       (((val)*95+2)/4)
 112
 113 #define DIV_TO_REG(val)         ((val)==4?2:(val)==2?1:(val)==1?0:3)
 114 #define DIV_FROM_REG(val)       (1 << (val))
 115
 116 #define BEEP_MASK_TO_REG(val)   ((val) & 0x7f & data->alarm_mask)
 117 #define BEEP_MASK_FROM_REG(val) ((val) & 0x7f)
 118
 119 /* Each client has this additional data */
 120 struct gl518_data {
 121         struct i2c_client client;
 122         struct device *hwmon_dev;
 123         enum chips type;
 124
 125         struct mutex update_lock;
 126         char valid;             /* !=0 if following fields are valid */
 127         unsigned long last_updated;     /* In jiffies */
 128
 129         u8 voltage_in[4];       /* Register values; [0] = VDD */
 130         u8 voltage_min[4];      /* Register values; [0] = VDD */
 131         u8 voltage_max[4];      /* Register values; [0] = VDD */
 132         u8 iter_voltage_in[4];  /* Register values; [0] = VDD */
 133         u8 fan_in[2];
 134         u8 fan_min[2];
 135         u8 fan_div[2];          /* Register encoding, shifted right */
 136         u8 fan_auto1;           /* Boolean */
 137         u8 temp_in;             /* Register values */
 138         u8 temp_max;            /* Register values */
 139         u8 temp_hyst;           /* Register values */
 140         u8 alarms;              /* Register value */
 141         u8 alarm_mask;          /* Register value */
 142         u8 beep_mask;           /* Register value */
 143         u8 beep_enable;         /* Boolean */
 144 };
 145
 146 static int gl518_attach_adapter(struct i2c_adapter *adapter);
 147 static int gl518_detect(struct i2c_adapter *adapter, int address, int kind);
 148 static void gl518_init_client(struct i2c_client *client);
 149 static int gl518_detach_client(struct i2c_client *client);
 150 static int gl518_read_value(struct i2c_client *client, u8 reg);
 151 static int gl518_write_value(struct i2c_client *client, u8 reg, u16 value);
 152 static struct gl518_data *gl518_update_device(struct device *dev);
 153
 154 /* This is the driver that will be inserted */
 155 static struct i2c_driver gl518_driver = {
 156         .driver = {
 157                 .name   = "gl518sm",
 158         },
 159         .id             = I2C_DRIVERID_GL518,
 160         .attach_adapter = gl518_attach_adapter,
 161         .detach_client  = gl518_detach_client,
 162 };
 163
 164 /*
 165  * Sysfs stuff
 166  */
 167
 168 #define show(type, suffix, value)                                       \
 169 static ssize_t show_##suffix(struct device *dev, struct device_attribute *attr, char *buf)              \
 170 {                                                                       \
 171         struct gl518_data *data = gl518_update_device(dev);             \
 172         return sprintf(buf, "%d\n", type##_FROM_REG(data->value));      \
 173 }
 174
 175 #define show_fan(suffix, value, index)                                  \
 176 static ssize_t show_##suffix(struct device *dev, struct device_attribute *attr, char *buf)              \
 177 {                                                                       \
 178         struct gl518_data *data = gl518_update_device(dev);             \
 179         return sprintf(buf, "%d\n", FAN_FROM_REG(data->value[index],    \
 180                 DIV_FROM_REG(data->fan_div[index])));                   \
 181 }
 182
 183 show(TEMP, temp_input1, temp_in);
 184 show(TEMP, temp_max1, temp_max);
 185 show(TEMP, temp_hyst1, temp_hyst);
 186 show(BOOL, fan_auto1, fan_auto1);
 187 show_fan(fan_input1, fan_in, 0);
 188 show_fan(fan_input2, fan_in, 1);
 189 show_fan(fan_min1, fan_min, 0);
 190 show_fan(fan_min2, fan_min, 1);
 191 show(DIV, fan_div1, fan_div[0]);
 192 show(DIV, fan_div2, fan_div[1]);
 193 show(VDD, in_input0, voltage_in[0]);
 194 show(IN, in_input1, voltage_in[1]);
 195 show(IN, in_input2, voltage_in[2]);
 196 show(IN, in_input3, voltage_in[3]);
 197 show(VDD, in_min0, voltage_min[0]);
 198 show(IN, in_min1, voltage_min[1]);
 199 show(IN, in_min2, voltage_min[2]);
 200 show(IN, in_min3, voltage_min[3]);
 201 show(VDD, in_max0, voltage_max[0]);
 202 show(IN, in_max1, voltage_max[1]);
 203 show(IN, in_max2, voltage_max[2]);
 204 show(IN, in_max3, voltage_max[3]);
 205 show(RAW, alarms, alarms);
 206 show(BOOL, beep_enable, beep_enable);
 207 show(BEEP_MASK, beep_mask, beep_mask);
 208
 209 #define set(type, suffix, value, reg)                                   \
 210 static ssize_t set_##suffix(struct device *dev, struct device_attribute *attr, const char *buf, \
 211         size_t count)                                                   \
 212 {                                                                       \
 213         struct i2c_client *client = to_i2c_client(dev);                 \
 214         struct gl518_data *data = i2c_get_clientdata(client);           \
 215         long val = simple_strtol(buf, NULL, 10);                        \
 216                                                                         \
 217         mutex_lock(&data->update_lock);                                 \
 218         data->value = type##_TO_REG(val);                               \
 219         gl518_write_value(client, reg, data->value);                    \
 220         mutex_unlock(&data->update_lock);                               \
 221         return count;                                                   \
 222 }
 223
 224 #define set_bits(type, suffix, value, reg, mask, shift)                 \
 225 static ssize_t set_##suffix(struct device *dev, struct device_attribute *attr, const char *buf, \
 226         size_t count)                                                   \
 227 {                                                                       \
 228         struct i2c_client *client = to_i2c_client(dev);                 \
 229         struct gl518_data *data = i2c_get_clientdata(client);           \
 230         int regvalue;                                                   \
 231         unsigned long val = simple_strtoul(buf, NULL, 10);              \
 232                                                                         \
 233         mutex_lock(&data->update_lock);                                 \
 234         regvalue = gl518_read_value(client, reg);                       \
 235         data->value = type##_TO_REG(val);                               \
 236         regvalue = (regvalue & ~mask) | (data->value << shift);         \
 237         gl518_write_value(client, reg, regvalue);                       \
 238         mutex_unlock(&data->update_lock);                               \
 239         return count;                                                   \
 240 }
 241
 242 #define set_low(type, suffix, value, reg)                               \
 243         set_bits(type, suffix, value, reg, 0x00ff, 0)
 244 #define set_high(type, suffix, value, reg)                              \
 245         set_bits(type, suffix, value, reg, 0xff00, 8)
 246
 247 set(TEMP, temp_max1, temp_max, GL518_REG_TEMP_MAX);
 248 set(TEMP, temp_hyst1, temp_hyst, GL518_REG_TEMP_HYST);
 249 set_bits(BOOL, fan_auto1, fan_auto1, GL518_REG_MISC, 0x08, 3);
 250 set_bits(DIV, fan_div1, fan_div[0], GL518_REG_MISC, 0xc0, 6);
 251 set_bits(DIV, fan_div2, fan_div[1], GL518_REG_MISC, 0x30, 4);
 252 set_low(VDD, in_min0, voltage_min[0], GL518_REG_VDD_LIMIT);
 253 set_low(IN, in_min1, voltage_min[1], GL518_REG_VIN1_LIMIT);
 254 set_low(IN, in_min2, voltage_min[2], GL518_REG_VIN2_LIMIT);
 255 set_low(IN, in_min3, voltage_min[3], GL518_REG_VIN3_LIMIT);
 256 set_high(VDD, in_max0, voltage_max[0], GL518_REG_VDD_LIMIT);
 257 set_high(IN, in_max1, voltage_max[1], GL518_REG_VIN1_LIMIT);
 258 set_high(IN, in_max2, voltage_max[2], GL518_REG_VIN2_LIMIT);
 259 set_high(IN, in_max3, voltage_max[3], GL518_REG_VIN3_LIMIT);
 260 set_bits(BOOL, beep_enable, beep_enable, GL518_REG_CONF, 0x04, 2);
 261 set(BEEP_MASK, beep_mask, beep_mask, GL518_REG_ALARM);
 262
 263 static ssize_t set_fan_min1(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 264 {
 265         struct i2c_client *client = to_i2c_client(dev);
 266         struct gl518_data *data = i2c_get_clientdata(client);
 267         int regvalue;
 268         unsigned long val = simple_strtoul(buf, NULL, 10);
 269
 270         mutex_lock(&data->update_lock);
 271         regvalue = gl518_read_value(client, GL518_REG_FAN_LIMIT);
 272         data->fan_min[0] = FAN_TO_REG(val,
 273                 DIV_FROM_REG(data->fan_div[0]));
 274         regvalue = (regvalue & 0x00ff) | (data->fan_min[0] << 8);
 275         gl518_write_value(client, GL518_REG_FAN_LIMIT, regvalue);
 276
 277         data->beep_mask = gl518_read_value(client, GL518_REG_ALARM);
 278         if (data->fan_min[0] == 0)
 279                 data->alarm_mask &= ~0x20;
 280         else
 281                 data->alarm_mask |= 0x20;
 282         data->beep_mask &= data->alarm_mask;
 283         gl518_write_value(client, GL518_REG_ALARM, data->beep_mask);
 284
 285         mutex_unlock(&data->update_lock);
 286         return count;
 287 }
 288
 289 static ssize_t set_fan_min2(struct device *dev, struct device_attribute *attr, const char *buf, size_t count)
 290 {
 291         struct i2c_client *client = to_i2c_client(dev);
 292         struct gl518_data *data = i2c_get_clientdata(client);
 293         int regvalue;
 294         unsigned long val = simple_strtoul(buf, NULL, 10);
 295
 296         mutex_lock(&data->update_lock);
 297         regvalue = gl518_read_value(client, GL518_REG_FAN_LIMIT);
 298         data->fan_min[1] = FAN_TO_REG(val,
 299                 DIV_FROM_REG(data->fan_div[1]));
 300         regvalue = (regvalue & 0xff00) | data->fan_min[1];
 301         gl518_write_value(client, GL518_REG_FAN_LIMIT, regvalue);
 302
 303         data->beep_mask = gl518_read_value(client, GL518_REG_ALARM);
 304         if (data->fan_min[1] == 0)
 305                 data->alarm_mask &= ~0x40;
 306         else
 307                 data->alarm_mask |= 0x40;
 308         data->beep_mask &= data->alarm_mask;
 309         gl518_write_value(client, GL518_REG_ALARM, data->beep_mask);
 310
 311         mutex_unlock(&data->update_lock);
 312         return count;
 313 }
 314
 315 static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL);
 316 static DEVICE_ATTR(temp1_max, S_IWUSR|S_IRUGO, show_temp_max1, set_temp_max1);
 317 static DEVICE_ATTR(temp1_max_hyst, S_IWUSR|S_IRUGO,
 318         show_temp_hyst1, set_temp_hyst1);
 319 static DEVICE_ATTR(fan1_auto, S_IWUSR|S_IRUGO, show_fan_auto1, set_fan_auto1);
 320 static DEVICE_ATTR(fan1_input, S_IRUGO, show_fan_input1, NULL);
 321 static DEVICE_ATTR(fan2_input, S_IRUGO, show_fan_input2, NULL);
 322 static DEVICE_ATTR(fan1_min, S_IWUSR|S_IRUGO, show_fan_min1, set_fan_min1);
 323 static DEVICE_ATTR(fan2_min, S_IWUSR|S_IRUGO, show_fan_min2, set_fan_min2);
 324 static DEVICE_ATTR(fan1_div, S_IWUSR|S_IRUGO, show_fan_div1, set_fan_div1);
 325 static DEVICE_ATTR(fan2_div, S_IWUSR|S_IRUGO, show_fan_div2, set_fan_div2);
 326 static DEVICE_ATTR(in0_input, S_IRUGO, show_in_input0, NULL);
 327 static DEVICE_ATTR(in1_input, S_IRUGO, show_in_input1, NULL);
 328 static DEVICE_ATTR(in2_input, S_IRUGO, show_in_input2, NULL);
 329 static DEVICE_ATTR(in3_input, S_IRUGO, show_in_input3, NULL);
 330 static DEVICE_ATTR(in0_min, S_IWUSR|S_IRUGO, show_in_min0, set_in_min0);
 331 static DEVICE_ATTR(in1_min, S_IWUSR|S_IRUGO, show_in_min1, set_in_min1);
 332 static DEVICE_ATTR(in2_min, S_IWUSR|S_IRUGO, show_in_min2, set_in_min2);
 333 static DEVICE_ATTR(in3_min, S_IWUSR|S_IRUGO, show_in_min3, set_in_min3);
 334 static DEVICE_ATTR(in0_max, S_IWUSR|S_IRUGO, show_in_max0, set_in_max0);
 335 static DEVICE_ATTR(in1_max, S_IWUSR|S_IRUGO, show_in_max1, set_in_max1);
 336 static DEVICE_ATTR(in2_max, S_IWUSR|S_IRUGO, show_in_max2, set_in_max2);
 337 static DEVICE_ATTR(in3_max, S_IWUSR|S_IRUGO, show_in_max3, set_in_max3);
 338 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
 339 static DEVICE_ATTR(beep_enable, S_IWUSR|S_IRUGO,
 340         show_beep_enable, set_beep_enable);
 341 static DEVICE_ATTR(beep_mask, S_IWUSR|S_IRUGO,
 342         show_beep_mask, set_beep_mask);
 343
 344 static struct attribute *gl518_attributes[] = {
 345         &dev_attr_in0_input.attr,
 346         &dev_attr_in1_input.attr,
 347         &dev_attr_in2_input.attr,
 348         &dev_attr_in3_input.attr,
 349         &dev_attr_in0_min.attr,
 350         &dev_attr_in1_min.attr,
 351         &dev_attr_in2_min.attr,
 352         &dev_attr_in3_min.attr,
 353         &dev_attr_in0_max.attr,
 354         &dev_attr_in1_max.attr,
 355         &dev_attr_in2_max.attr,
 356         &dev_attr_in3_max.attr,
 357
 358         &dev_attr_fan1_auto.attr,
 359         &dev_attr_fan1_input.attr,
 360         &dev_attr_fan2_input.attr,
 361         &dev_attr_fan1_min.attr,
 362         &dev_attr_fan2_min.attr,
 363         &dev_attr_fan1_div.attr,
 364         &dev_attr_fan2_div.attr,
 365
 366         &dev_attr_temp1_input.attr,
 367         &dev_attr_temp1_max.attr,
 368         &dev_attr_temp1_max_hyst.attr,
 369
 370         &dev_attr_alarms.attr,
 371         &dev_attr_beep_enable.attr,
 372         &dev_attr_beep_mask.attr,
 373         NULL
 374 };
 375
 376 static const struct attribute_group gl518_group = {
 377         .attrs = gl518_attributes,
 378 };
 379
 380 /*
 381  * Real code
 382  */
 383
 384 static int gl518_attach_adapter(struct i2c_adapter *adapter)
 385 {
 386         if (!(adapter->class & I2C_CLASS_HWMON))
 387                 return 0;
 388         return i2c_probe(adapter, &addr_data, gl518_detect);
 389 }
 390
 391 static int gl518_detect(struct i2c_adapter *adapter, int address, int kind)
 392 {
 393         int i;
 394         struct i2c_client *new_client;
 395         struct gl518_data *data;
 396         int err = 0;
 397
 398         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
 399                                      I2C_FUNC_SMBUS_WORD_DATA))
 400                 goto exit;
 401
 402         /* OK. For now, we presume we have a valid client. We now create the
 403            client structure, even though we cannot fill it completely yet.
 404            But it allows us to access gl518_{read,write}_value. */
 405
 406         if (!(data = kzalloc(sizeof(struct gl518_data), GFP_KERNEL))) {
 407                 err = -ENOMEM;
 408                 goto exit;
 409         }
 410
 411         new_client = &data->client;
 412         i2c_set_clientdata(new_client, data);
 413
 414         new_client->addr = address;
 415         new_client->adapter = adapter;
 416         new_client->driver = &gl518_driver;
 417         new_client->flags = 0;
 418
 419         /* Now, we do the remaining detection. */
 420
 421         if (kind < 0) {
 422                 if ((gl518_read_value(new_client, GL518_REG_CHIP_ID) != 0x80)
 423                  || (gl518_read_value(new_client, GL518_REG_CONF) & 0x80))
 424                         goto exit_free;
 425         }
 426
 427         /* Determine the chip type. */
 428         if (kind <= 0) {
 429                 i = gl518_read_value(new_client, GL518_REG_REVISION);
 430                 if (i == 0x00) {
 431                         kind = gl518sm_r00;
 432                 } else if (i == 0x80) {
 433                         kind = gl518sm_r80;
 434                 } else {
 435                         if (kind <= 0)
 436                                 dev_info(&adapter->dev,
 437                                     "Ignoring 'force' parameter for unknown "
 438                                     "chip at adapter %d, address 0x%02x\n",
 439                                     i2c_adapter_id(adapter), address);
 440                         goto exit_free;
 441                 }
 442         }
 443
 444         /* Fill in the remaining client fields */
 445         strlcpy(new_client->name, "gl518sm", I2C_NAME_SIZE);
 446         data->type = kind;
 447         data->valid = 0;
 448         mutex_init(&data->update_lock);
 449
 450         /* Tell the I2C layer a new client has arrived */
 451         if ((err = i2c_attach_client(new_client)))
 452                 goto exit_free;
 453
 454         /* Initialize the GL518SM chip */
 455         data->alarm_mask = 0xff;
 456         data->voltage_in[0]=data->voltage_in[1]=data->voltage_in[2]=0;
 457         gl518_init_client((struct i2c_client *) new_client);
 458
 459         /* Register sysfs hooks */
 460         if ((err = sysfs_create_group(&new_client->dev.kobj, &gl518_group)))
 461                 goto exit_detach;
 462
 463         data->hwmon_dev = hwmon_device_register(&new_client->dev);
 464         if (IS_ERR(data->hwmon_dev)) {
 465                 err = PTR_ERR(data->hwmon_dev);
 466                 goto exit_remove_files;
 467         }
 468
 469         return 0;
 470
 471 exit_remove_files:
 472         sysfs_remove_group(&new_client->dev.kobj, &gl518_group);
 473 exit_detach:
 474         i2c_detach_client(new_client);
 475 exit_free:
 476         kfree(data);
 477 exit:
 478         return err;
 479 }
 480
 481
 482 /* Called when we have found a new GL518SM.
 483    Note that we preserve D4:NoFan2 and D2:beep_enable. */
 484 static void gl518_init_client(struct i2c_client *client)
 485 {
 486         /* Make sure we leave D7:Reset untouched */
 487         u8 regvalue = gl518_read_value(client, GL518_REG_CONF) & 0x7f;
 488
 489         /* Comparator mode (D3=0), standby mode (D6=0) */
 490         gl518_write_value(client, GL518_REG_CONF, (regvalue &= 0x37));
 491
 492         /* Never interrupts */
 493         gl518_write_value(client, GL518_REG_MASK, 0x00);
 494
 495         /* Clear status register (D5=1), start (D6=1) */
 496         gl518_write_value(client, GL518_REG_CONF, 0x20 | regvalue);
 497         gl518_write_value(client, GL518_REG_CONF, 0x40 | regvalue);
 498 }
 499
 500 static int gl518_detach_client(struct i2c_client *client)
 501 {
 502         struct gl518_data *data = i2c_get_clientdata(client);
 503         int err;
 504
 505         hwmon_device_unregister(data->hwmon_dev);
 506         sysfs_remove_group(&client->dev.kobj, &gl518_group);
 507
 508         if ((err = i2c_detach_client(client)))
 509                 return err;
 510
 511         kfree(data);
 512         return 0;
 513 }
 514
 515 /* Registers 0x07 to 0x0c are word-sized, others are byte-sized
 516    GL518 uses a high-byte first convention, which is exactly opposite to
 517    the usual practice. */
 518 static int gl518_read_value(struct i2c_client *client, u8 reg)
 519 {
 520         if ((reg >= 0x07) && (reg <= 0x0c))
 521                 return swab16(i2c_smbus_read_word_data(client, reg));
 522         else
 523                 return i2c_smbus_read_byte_data(client, reg);
 524 }
 525
 526 /* Registers 0x07 to 0x0c are word-sized, others are byte-sized
 527    GL518 uses a high-byte first convention, which is exactly opposite to
 528    the usual practice. */
 529 static int gl518_write_value(struct i2c_client *client, u8 reg, u16 value)
 530 {
 531         if ((reg >= 0x07) && (reg <= 0x0c))
 532                 return i2c_smbus_write_word_data(client, reg, swab16(value));
 533         else
 534                 return i2c_smbus_write_byte_data(client, reg, value);
 535 }
 536
 537 static struct gl518_data *gl518_update_device(struct device *dev)
 538 {
 539         struct i2c_client *client = to_i2c_client(dev);
 540         struct gl518_data *data = i2c_get_clientdata(client);
 541         int val;
 542
 543         mutex_lock(&data->update_lock);
 544
 545         if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
 546             || !data->valid) {
 547                 dev_dbg(&client->dev, "Starting gl518 update\n");
 548
 549                 data->alarms = gl518_read_value(client, GL518_REG_INT);
 550                 data->beep_mask = gl518_read_value(client, GL518_REG_ALARM);
 551
 552                 val = gl518_read_value(client, GL518_REG_VDD_LIMIT);
 553                 data->voltage_min[0] = val & 0xff;
 554                 data->voltage_max[0] = (val >> 8) & 0xff;
 555                 val = gl518_read_value(client, GL518_REG_VIN1_LIMIT);
 556                 data->voltage_min[1] = val & 0xff;
 557                 data->voltage_max[1] = (val >> 8) & 0xff;
 558                 val = gl518_read_value(client, GL518_REG_VIN2_LIMIT);
 559                 data->voltage_min[2] = val & 0xff;
 560                 data->voltage_max[2] = (val >> 8) & 0xff;
 561                 val = gl518_read_value(client, GL518_REG_VIN3_LIMIT);
 562                 data->voltage_min[3] = val & 0xff;
 563                 data->voltage_max[3] = (val >> 8) & 0xff;
 564
 565                 val = gl518_read_value(client, GL518_REG_FAN_COUNT);
 566                 data->fan_in[0] = (val >> 8) & 0xff;
 567                 data->fan_in[1] = val & 0xff;
 568
 569                 val = gl518_read_value(client, GL518_REG_FAN_LIMIT);
 570                 data->fan_min[0] = (val >> 8) & 0xff;
 571                 data->fan_min[1] = val & 0xff;
 572
 573                 data->temp_in = gl518_read_value(client, GL518_REG_TEMP_IN);
 574                 data->temp_max =
 575                     gl518_read_value(client, GL518_REG_TEMP_MAX);
 576                 data->temp_hyst =
 577                     gl518_read_value(client, GL518_REG_TEMP_HYST);
 578
 579                 val = gl518_read_value(client, GL518_REG_MISC);
 580                 data->fan_div[0] = (val >> 6) & 0x03;
 581                 data->fan_div[1] = (val >> 4) & 0x03;
 582                 data->fan_auto1  = (val >> 3) & 0x01;
 583
 584                 data->alarms &= data->alarm_mask;
 585
 586                 val = gl518_read_value(client, GL518_REG_CONF);
 587                 data->beep_enable = (val >> 2) & 1;
 588
 589                 if (data->type != gl518sm_r00) {
 590                         data->voltage_in[0] =
 591                             gl518_read_value(client, GL518_REG_VDD);
 592                         data->voltage_in[1] =
 593                             gl518_read_value(client, GL518_REG_VIN1);
 594                         data->voltage_in[2] =
 595                             gl518_read_value(client, GL518_REG_VIN2);
 596                 }
 597                 data->voltage_in[3] =
 598                     gl518_read_value(client, GL518_REG_VIN3);
 599
 600                 data->last_updated = jiffies;
 601                 data->valid = 1;
 602         }
 603
 604         mutex_unlock(&data->update_lock);
 605
 606         return data;
 607 }
 608
 609 static int __init sensors_gl518sm_init(void)
 610 {
 611         return i2c_add_driver(&gl518_driver);
 612 }
 613
 614 static void __exit sensors_gl518sm_exit(void)
 615 {
 616         i2c_del_driver(&gl518_driver);
 617 }
 618
 619 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>, "
 620         "Kyosti Malkki <kmalkki@cc.hut.fi> and "
 621         "Hong-Gunn Chew <hglinux@gunnet.org>");
 622 MODULE_DESCRIPTION("GL518SM driver");
 623 MODULE_LICENSE("GPL");
 624
 625 module_init(sensors_gl518sm_init);
 626 module_exit(sensors_gl518sm_exit);