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 unsigned short normal_i2c[] = { 0x2c, 0x2d, I2C_CLIENT_END };
  48
  49 /* Insmod parameters */
  50 I2C_CLIENT_INSMOD_2(gl518sm_r00, gl518sm_r80);
  51
  52 /* Many GL518 constants specified below */
  53
  54 /* The GL518 registers */
  55 #define GL518_REG_CHIP_ID       0x00
  56 #define GL518_REG_REVISION      0x01
  57 #define GL518_REG_VENDOR_ID     0x02
  58 #define GL518_REG_CONF          0x03
  59 #define GL518_REG_TEMP_IN       0x04
  60 #define GL518_REG_TEMP_MAX      0x05
  61 #define GL518_REG_TEMP_HYST     0x06
  62 #define GL518_REG_FAN_COUNT     0x07
  63 #define GL518_REG_FAN_LIMIT     0x08
  64 #define GL518_REG_VIN1_LIMIT    0x09
  65 #define GL518_REG_VIN2_LIMIT    0x0a
  66 #define GL518_REG_VIN3_LIMIT    0x0b
  67 #define GL518_REG_VDD_LIMIT     0x0c
  68 #define GL518_REG_VIN3          0x0d
  69 #define GL518_REG_MISC          0x0f
  70 #define GL518_REG_ALARM         0x10
  71 #define GL518_REG_MASK          0x11
  72 #define GL518_REG_INT           0x12
  73 #define GL518_REG_VIN2          0x13
  74 #define GL518_REG_VIN1          0x14
  75 #define GL518_REG_VDD           0x15
  76
  77
  78 /*
  79  * Conversions. Rounding and limit checking is only done on the TO_REG
  80  * variants. Note that you should be a bit careful with which arguments
  81  * these macros are called: arguments may be evaluated more than once.
  82  * Fixing this is just not worth it.
  83  */
  84
  85 #define RAW_FROM_REG(val)       val
  86
  87 #define BOOL_FROM_REG(val)      ((val)?0:1)
  88 #define BOOL_TO_REG(val)        ((val)?0:1)
  89
  90 #define TEMP_TO_REG(val)        (SENSORS_LIMIT(((((val)<0? \
  91                                 (val)-500:(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 = SENSORS_LIMIT(rpm, 1, 1920000) * div;
 100         return SENSORS_LIMIT((960000 + rpmdiv / 2) / rpmdiv, 1, 255);
 101 }
 102 #define FAN_FROM_REG(val,div)   ((val)==0 ? 0 : (960000/((val)*(div))))
 103
 104 #define IN_TO_REG(val)          (SENSORS_LIMIT((((val)+9)/19),0,255))
 105 #define IN_FROM_REG(val)        ((val)*19)
 106
 107 #define VDD_TO_REG(val)         (SENSORS_LIMIT((((val)*4+47)/95),0,255))
 108 #define VDD_FROM_REG(val)       (((val)*95+2)/4)
 109
 110 #define DIV_TO_REG(val)         ((val)==4?2:(val)==2?1:(val)==1?0:3)
 111 #define DIV_FROM_REG(val)       (1 << (val))
 112
 113 #define BEEP_MASK_TO_REG(val)   ((val) & 0x7f & data->alarm_mask)
 114 #define BEEP_MASK_FROM_REG(val) ((val) & 0x7f)
 115
 116 /* Each client has this additional data */
 117 struct gl518_data {
 118         struct i2c_client client;
 119         struct device *hwmon_dev;
 120         enum chips type;
 121
 122         struct mutex update_lock;
 123         char valid;             /* !=0 if following fields are valid */
 124         unsigned long last_updated;     /* In jiffies */
 125
 126         u8 voltage_in[4];       /* Register values; [0] = VDD */
 127         u8 voltage_min[4];      /* Register values; [0] = VDD */
 128         u8 voltage_max[4];      /* Register values; [0] = VDD */
 129         u8 fan_in[2];
 130         u8 fan_min[2];
 131         u8 fan_div[2];          /* Register encoding, shifted right */
 132         u8 fan_auto1;           /* Boolean */
 133         u8 temp_in;             /* Register values */
 134         u8 temp_max;            /* Register values */
 135         u8 temp_hyst;           /* Register values */
 136         u8 alarms;              /* Register value */
 137         u8 alarm_mask;
 138         u8 beep_mask;           /* Register value */
 139         u8 beep_enable;         /* Boolean */
 140 };
 141
 142 static int gl518_attach_adapter(struct i2c_adapter *adapter);
 143 static int gl518_detect(struct i2c_adapter *adapter, int address, int kind);
 144 static void gl518_init_client(struct i2c_client *client);
 145 static int gl518_detach_client(struct i2c_client *client);
 146 static int gl518_read_value(struct i2c_client *client, u8 reg);
 147 static int gl518_write_value(struct i2c_client *client, u8 reg, u16 value);
 148 static struct gl518_data *gl518_update_device(struct device *dev);
 149
 150 /* This is the driver that will be inserted */
 151 static struct i2c_driver gl518_driver = {
 152         .driver = {
 153                 .name   = "gl518sm",
 154         },
 155         .attach_adapter = gl518_attach_adapter,
 156         .detach_client  = gl518_detach_client,
 157 };
 158
 159 /*
 160  * Sysfs stuff
 161  */
 162
 163 #define show(type, suffix, value)                                       \
 164 static ssize_t show_##suffix(struct device *dev, struct device_attribute *attr, char *buf)              \
 165 {                                                                       \
 166         struct gl518_data *data = gl518_update_device(dev);             \
 167         return sprintf(buf, "%d\n", type##_FROM_REG(data->value));      \
 168 }
 169
 170 show(TEMP, temp_input1, temp_in);
 171 show(TEMP, temp_max1, temp_max);
 172 show(TEMP, temp_hyst1, temp_hyst);
 173 show(BOOL, fan_auto1, fan_auto1);
 174 show(VDD, in_input0, voltage_in[0]);
 175 show(IN, in_input1, voltage_in[1]);
 176 show(IN, in_input2, voltage_in[2]);
 177 show(IN, in_input3, voltage_in[3]);
 178 show(VDD, in_min0, voltage_min[0]);
 179 show(IN, in_min1, voltage_min[1]);
 180 show(IN, in_min2, voltage_min[2]);
 181 show(IN, in_min3, voltage_min[3]);
 182 show(VDD, in_max0, voltage_max[0]);
 183 show(IN, in_max1, voltage_max[1]);
 184 show(IN, in_max2, voltage_max[2]);
 185 show(IN, in_max3, voltage_max[3]);
 186 show(RAW, alarms, alarms);
 187 show(BOOL, beep_enable, beep_enable);
 188 show(BEEP_MASK, beep_mask, beep_mask);
 189
 190 static ssize_t show_fan_input(struct device *dev,
 191                               struct device_attribute *attr, char *buf)
 192 {
 193         int nr = to_sensor_dev_attr(attr)->index;
 194         struct gl518_data *data = gl518_update_device(dev);
 195         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_in[nr],
 196                                         DIV_FROM_REG(data->fan_div[nr])));
 197 }
 198
 199 static ssize_t show_fan_min(struct device *dev,
 200                             struct device_attribute *attr, char *buf)
 201 {
 202         int nr = to_sensor_dev_attr(attr)->index;
 203         struct gl518_data *data = gl518_update_device(dev);
 204         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[nr],
 205                                         DIV_FROM_REG(data->fan_div[nr])));
 206 }
 207
 208 static ssize_t show_fan_div(struct device *dev,
 209                             struct device_attribute *attr, char *buf)
 210 {
 211         int nr = to_sensor_dev_attr(attr)->index;
 212         struct gl518_data *data = gl518_update_device(dev);
 213         return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]));
 214 }
 215
 216 #define set(type, suffix, value, reg)                                   \
 217 static ssize_t set_##suffix(struct device *dev, struct device_attribute *attr, const char *buf, \
 218         size_t count)                                                   \
 219 {                                                                       \
 220         struct i2c_client *client = to_i2c_client(dev);                 \
 221         struct gl518_data *data = i2c_get_clientdata(client);           \
 222         long val = simple_strtol(buf, NULL, 10);                        \
 223                                                                         \
 224         mutex_lock(&data->update_lock);                                 \
 225         data->value = type##_TO_REG(val);                               \
 226         gl518_write_value(client, reg, data->value);                    \
 227         mutex_unlock(&data->update_lock);                               \
 228         return count;                                                   \
 229 }
 230
 231 #define set_bits(type, suffix, value, reg, mask, shift)                 \
 232 static ssize_t set_##suffix(struct device *dev, struct device_attribute *attr, const char *buf, \
 233         size_t count)                                                   \
 234 {                                                                       \
 235         struct i2c_client *client = to_i2c_client(dev);                 \
 236         struct gl518_data *data = i2c_get_clientdata(client);           \
 237         int regvalue;                                                   \
 238         unsigned long val = simple_strtoul(buf, NULL, 10);              \
 239                                                                         \
 240         mutex_lock(&data->update_lock);                                 \
 241         regvalue = gl518_read_value(client, reg);                       \
 242         data->value = type##_TO_REG(val);                               \
 243         regvalue = (regvalue & ~mask) | (data->value << shift);         \
 244         gl518_write_value(client, reg, regvalue);                       \
 245         mutex_unlock(&data->update_lock);                               \
 246         return count;                                                   \
 247 }
 248
 249 #define set_low(type, suffix, value, reg)                               \
 250         set_bits(type, suffix, value, reg, 0x00ff, 0)
 251 #define set_high(type, suffix, value, reg)                              \
 252         set_bits(type, suffix, value, reg, 0xff00, 8)
 253
 254 set(TEMP, temp_max1, temp_max, GL518_REG_TEMP_MAX);
 255 set(TEMP, temp_hyst1, temp_hyst, GL518_REG_TEMP_HYST);
 256 set_bits(BOOL, fan_auto1, fan_auto1, GL518_REG_MISC, 0x08, 3);
 257 set_low(VDD, in_min0, voltage_min[0], GL518_REG_VDD_LIMIT);
 258 set_low(IN, in_min1, voltage_min[1], GL518_REG_VIN1_LIMIT);
 259 set_low(IN, in_min2, voltage_min[2], GL518_REG_VIN2_LIMIT);
 260 set_low(IN, in_min3, voltage_min[3], GL518_REG_VIN3_LIMIT);
 261 set_high(VDD, in_max0, voltage_max[0], GL518_REG_VDD_LIMIT);
 262 set_high(IN, in_max1, voltage_max[1], GL518_REG_VIN1_LIMIT);
 263 set_high(IN, in_max2, voltage_max[2], GL518_REG_VIN2_LIMIT);
 264 set_high(IN, in_max3, voltage_max[3], GL518_REG_VIN3_LIMIT);
 265 set_bits(BOOL, beep_enable, beep_enable, GL518_REG_CONF, 0x04, 2);
 266 set(BEEP_MASK, beep_mask, beep_mask, GL518_REG_ALARM);
 267
 268 static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr,
 269                            const char *buf, size_t count)
 270 {
 271         struct i2c_client *client = to_i2c_client(dev);
 272         struct gl518_data *data = i2c_get_clientdata(client);
 273         int nr = to_sensor_dev_attr(attr)->index;
 274         int regvalue;
 275         unsigned long val = simple_strtoul(buf, NULL, 10);
 276
 277         mutex_lock(&data->update_lock);
 278         regvalue = gl518_read_value(client, GL518_REG_FAN_LIMIT);
 279         data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
 280         regvalue = (regvalue & (0xff << (8 * nr)))
 281                  | (data->fan_min[nr] << (8 * (1 - nr)));
 282         gl518_write_value(client, GL518_REG_FAN_LIMIT, regvalue);
 283
 284         data->beep_mask = gl518_read_value(client, GL518_REG_ALARM);
 285         if (data->fan_min[nr] == 0)
 286                 data->alarm_mask &= ~(0x20 << nr);
 287         else
 288                 data->alarm_mask |= (0x20 << nr);
 289         data->beep_mask &= data->alarm_mask;
 290         gl518_write_value(client, GL518_REG_ALARM, data->beep_mask);
 291
 292         mutex_unlock(&data->update_lock);
 293         return count;
 294 }
 295
 296 static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr,
 297                            const char *buf, size_t count)
 298 {
 299         struct i2c_client *client = to_i2c_client(dev);
 300         struct gl518_data *data = i2c_get_clientdata(client);
 301         int nr = to_sensor_dev_attr(attr)->index;
 302         int regvalue;
 303         unsigned long val = simple_strtoul(buf, NULL, 10);
 304
 305         mutex_lock(&data->update_lock);
 306         regvalue = gl518_read_value(client, GL518_REG_MISC);
 307         data->fan_div[nr] = DIV_TO_REG(val);
 308         regvalue = (regvalue & ~(0xc0 >> (2 * nr)))
 309                  | (data->fan_div[nr] << (6 - 2 * nr));
 310         gl518_write_value(client, GL518_REG_MISC, regvalue);
 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 SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan_input, NULL, 0);
 321 static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan_input, NULL, 1);
 322 static SENSOR_DEVICE_ATTR(fan1_min, S_IWUSR|S_IRUGO,
 323         show_fan_min, set_fan_min, 0);
 324 static SENSOR_DEVICE_ATTR(fan2_min, S_IWUSR|S_IRUGO,
 325         show_fan_min, set_fan_min, 1);
 326 static SENSOR_DEVICE_ATTR(fan1_div, S_IWUSR|S_IRUGO,
 327         show_fan_div, set_fan_div, 0);
 328 static SENSOR_DEVICE_ATTR(fan2_div, S_IWUSR|S_IRUGO,
 329         show_fan_div, set_fan_div, 1);
 330 static DEVICE_ATTR(in0_input, S_IRUGO, show_in_input0, NULL);
 331 static DEVICE_ATTR(in1_input, S_IRUGO, show_in_input1, NULL);
 332 static DEVICE_ATTR(in2_input, S_IRUGO, show_in_input2, NULL);
 333 static DEVICE_ATTR(in3_input, S_IRUGO, show_in_input3, NULL);
 334 static DEVICE_ATTR(in0_min, S_IWUSR|S_IRUGO, show_in_min0, set_in_min0);
 335 static DEVICE_ATTR(in1_min, S_IWUSR|S_IRUGO, show_in_min1, set_in_min1);
 336 static DEVICE_ATTR(in2_min, S_IWUSR|S_IRUGO, show_in_min2, set_in_min2);
 337 static DEVICE_ATTR(in3_min, S_IWUSR|S_IRUGO, show_in_min3, set_in_min3);
 338 static DEVICE_ATTR(in0_max, S_IWUSR|S_IRUGO, show_in_max0, set_in_max0);
 339 static DEVICE_ATTR(in1_max, S_IWUSR|S_IRUGO, show_in_max1, set_in_max1);
 340 static DEVICE_ATTR(in2_max, S_IWUSR|S_IRUGO, show_in_max2, set_in_max2);
 341 static DEVICE_ATTR(in3_max, S_IWUSR|S_IRUGO, show_in_max3, set_in_max3);
 342 static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
 343 static DEVICE_ATTR(beep_enable, S_IWUSR|S_IRUGO,
 344         show_beep_enable, set_beep_enable);
 345 static DEVICE_ATTR(beep_mask, S_IWUSR|S_IRUGO,
 346         show_beep_mask, set_beep_mask);
 347
 348 static struct attribute *gl518_attributes[] = {
 349         &dev_attr_in3_input.attr,
 350         &dev_attr_in0_min.attr,
 351         &dev_attr_in1_min.attr,
 352         &dev_attr_in2_min.attr,
 353         &dev_attr_in3_min.attr,
 354         &dev_attr_in0_max.attr,
 355         &dev_attr_in1_max.attr,
 356         &dev_attr_in2_max.attr,
 357         &dev_attr_in3_max.attr,
 358
 359         &dev_attr_fan1_auto.attr,
 360         &sensor_dev_attr_fan1_input.dev_attr.attr,
 361         &sensor_dev_attr_fan2_input.dev_attr.attr,
 362         &sensor_dev_attr_fan1_min.dev_attr.attr,
 363         &sensor_dev_attr_fan2_min.dev_attr.attr,
 364         &sensor_dev_attr_fan1_div.dev_attr.attr,
 365         &sensor_dev_attr_fan2_div.dev_attr.attr,
 366
 367         &dev_attr_temp1_input.attr,
 368         &dev_attr_temp1_max.attr,
 369         &dev_attr_temp1_max_hyst.attr,
 370
 371         &dev_attr_alarms.attr,
 372         &dev_attr_beep_enable.attr,
 373         &dev_attr_beep_mask.attr,
 374         NULL
 375 };
 376
 377 static const struct attribute_group gl518_group = {
 378         .attrs = gl518_attributes,
 379 };
 380
 381 static struct attribute *gl518_attributes_r80[] = {
 382         &dev_attr_in0_input.attr,
 383         &dev_attr_in1_input.attr,
 384         &dev_attr_in2_input.attr,
 385         NULL
 386 };
 387
 388 static const struct attribute_group gl518_group_r80 = {
 389         .attrs = gl518_attributes_r80,
 390 };
 391
 392 /*
 393  * Real code
 394  */
 395
 396 static int gl518_attach_adapter(struct i2c_adapter *adapter)
 397 {
 398         if (!(adapter->class & I2C_CLASS_HWMON))
 399                 return 0;
 400         return i2c_probe(adapter, &addr_data, gl518_detect);
 401 }
 402
 403 static int gl518_detect(struct i2c_adapter *adapter, int address, int kind)
 404 {
 405         int i;
 406         struct i2c_client *client;
 407         struct gl518_data *data;
 408         int err = 0;
 409
 410         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
 411                                      I2C_FUNC_SMBUS_WORD_DATA))
 412                 goto exit;
 413
 414         /* OK. For now, we presume we have a valid client. We now create the
 415            client structure, even though we cannot fill it completely yet.
 416            But it allows us to access gl518_{read,write}_value. */
 417
 418         if (!(data = kzalloc(sizeof(struct gl518_data), GFP_KERNEL))) {
 419                 err = -ENOMEM;
 420                 goto exit;
 421         }
 422
 423         client = &data->client;
 424         i2c_set_clientdata(client, data);
 425
 426         client->addr = address;
 427         client->adapter = adapter;
 428         client->driver = &gl518_driver;
 429
 430         /* Now, we do the remaining detection. */
 431
 432         if (kind < 0) {
 433                 if ((gl518_read_value(client, GL518_REG_CHIP_ID) != 0x80)
 434                  || (gl518_read_value(client, GL518_REG_CONF) & 0x80))
 435                         goto exit_free;
 436         }
 437
 438         /* Determine the chip type. */
 439         if (kind <= 0) {
 440                 i = gl518_read_value(client, GL518_REG_REVISION);
 441                 if (i == 0x00) {
 442                         kind = gl518sm_r00;
 443                 } else if (i == 0x80) {
 444                         kind = gl518sm_r80;
 445                 } else {
 446                         if (kind <= 0)
 447                                 dev_info(&adapter->dev,
 448                                     "Ignoring 'force' parameter for unknown "
 449                                     "chip at adapter %d, address 0x%02x\n",
 450                                     i2c_adapter_id(adapter), address);
 451                         goto exit_free;
 452                 }
 453         }
 454
 455         /* Fill in the remaining client fields */
 456         strlcpy(client->name, "gl518sm", I2C_NAME_SIZE);
 457         data->type = kind;
 458         mutex_init(&data->update_lock);
 459
 460         /* Tell the I2C layer a new client has arrived */
 461         if ((err = i2c_attach_client(client)))
 462                 goto exit_free;
 463
 464         /* Initialize the GL518SM chip */
 465         data->alarm_mask = 0xff;
 466         gl518_init_client(client);
 467
 468         /* Register sysfs hooks */
 469         if ((err = sysfs_create_group(&client->dev.kobj, &gl518_group)))
 470                 goto exit_detach;
 471         if (data->type == gl518sm_r80)
 472                 if ((err = sysfs_create_group(&client->dev.kobj,
 473                                               &gl518_group_r80)))
 474                         goto exit_remove_files;
 475
 476         data->hwmon_dev = hwmon_device_register(&client->dev);
 477         if (IS_ERR(data->hwmon_dev)) {
 478                 err = PTR_ERR(data->hwmon_dev);
 479                 goto exit_remove_files;
 480         }
 481
 482         return 0;
 483
 484 exit_remove_files:
 485         sysfs_remove_group(&client->dev.kobj, &gl518_group);
 486         if (data->type == gl518sm_r80)
 487                 sysfs_remove_group(&client->dev.kobj, &gl518_group_r80);
 488 exit_detach:
 489         i2c_detach_client(client);
 490 exit_free:
 491         kfree(data);
 492 exit:
 493         return err;
 494 }
 495
 496
 497 /* Called when we have found a new GL518SM.
 498    Note that we preserve D4:NoFan2 and D2:beep_enable. */
 499 static void gl518_init_client(struct i2c_client *client)
 500 {
 501         /* Make sure we leave D7:Reset untouched */
 502         u8 regvalue = gl518_read_value(client, GL518_REG_CONF) & 0x7f;
 503
 504         /* Comparator mode (D3=0), standby mode (D6=0) */
 505         gl518_write_value(client, GL518_REG_CONF, (regvalue &= 0x37));
 506
 507         /* Never interrupts */
 508         gl518_write_value(client, GL518_REG_MASK, 0x00);
 509
 510         /* Clear status register (D5=1), start (D6=1) */
 511         gl518_write_value(client, GL518_REG_CONF, 0x20 | regvalue);
 512         gl518_write_value(client, GL518_REG_CONF, 0x40 | regvalue);
 513 }
 514
 515 static int gl518_detach_client(struct i2c_client *client)
 516 {
 517         struct gl518_data *data = i2c_get_clientdata(client);
 518         int err;
 519
 520         hwmon_device_unregister(data->hwmon_dev);
 521         sysfs_remove_group(&client->dev.kobj, &gl518_group);
 522         if (data->type == gl518sm_r80)
 523                 sysfs_remove_group(&client->dev.kobj, &gl518_group_r80);
 524
 525         if ((err = i2c_detach_client(client)))
 526                 return err;
 527
 528         kfree(data);
 529         return 0;
 530 }
 531
 532 /* Registers 0x07 to 0x0c are word-sized, others are byte-sized
 533    GL518 uses a high-byte first convention, which is exactly opposite to
 534    the SMBus standard. */
 535 static int gl518_read_value(struct i2c_client *client, u8 reg)
 536 {
 537         if ((reg >= 0x07) && (reg <= 0x0c))
 538                 return swab16(i2c_smbus_read_word_data(client, reg));
 539         else
 540                 return i2c_smbus_read_byte_data(client, reg);
 541 }
 542
 543 static int gl518_write_value(struct i2c_client *client, u8 reg, u16 value)
 544 {
 545         if ((reg >= 0x07) && (reg <= 0x0c))
 546                 return i2c_smbus_write_word_data(client, reg, swab16(value));
 547         else
 548                 return i2c_smbus_write_byte_data(client, reg, value);
 549 }
 550
 551 static struct gl518_data *gl518_update_device(struct device *dev)
 552 {
 553         struct i2c_client *client = to_i2c_client(dev);
 554         struct gl518_data *data = i2c_get_clientdata(client);
 555         int val;
 556
 557         mutex_lock(&data->update_lock);
 558
 559         if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
 560             || !data->valid) {
 561                 dev_dbg(&client->dev, "Starting gl518 update\n");
 562
 563                 data->alarms = gl518_read_value(client, GL518_REG_INT);
 564                 data->beep_mask = gl518_read_value(client, GL518_REG_ALARM);
 565
 566                 val = gl518_read_value(client, GL518_REG_VDD_LIMIT);
 567                 data->voltage_min[0] = val & 0xff;
 568                 data->voltage_max[0] = (val >> 8) & 0xff;
 569                 val = gl518_read_value(client, GL518_REG_VIN1_LIMIT);
 570                 data->voltage_min[1] = val & 0xff;
 571                 data->voltage_max[1] = (val >> 8) & 0xff;
 572                 val = gl518_read_value(client, GL518_REG_VIN2_LIMIT);
 573                 data->voltage_min[2] = val & 0xff;
 574                 data->voltage_max[2] = (val >> 8) & 0xff;
 575                 val = gl518_read_value(client, GL518_REG_VIN3_LIMIT);
 576                 data->voltage_min[3] = val & 0xff;
 577                 data->voltage_max[3] = (val >> 8) & 0xff;
 578
 579                 val = gl518_read_value(client, GL518_REG_FAN_COUNT);
 580                 data->fan_in[0] = (val >> 8) & 0xff;
 581                 data->fan_in[1] = val & 0xff;
 582
 583                 val = gl518_read_value(client, GL518_REG_FAN_LIMIT);
 584                 data->fan_min[0] = (val >> 8) & 0xff;
 585                 data->fan_min[1] = val & 0xff;
 586
 587                 data->temp_in = gl518_read_value(client, GL518_REG_TEMP_IN);
 588                 data->temp_max =
 589                     gl518_read_value(client, GL518_REG_TEMP_MAX);
 590                 data->temp_hyst =
 591                     gl518_read_value(client, GL518_REG_TEMP_HYST);
 592
 593                 val = gl518_read_value(client, GL518_REG_MISC);
 594                 data->fan_div[0] = (val >> 6) & 0x03;
 595                 data->fan_div[1] = (val >> 4) & 0x03;
 596                 data->fan_auto1  = (val >> 3) & 0x01;
 597
 598                 data->alarms &= data->alarm_mask;
 599
 600                 val = gl518_read_value(client, GL518_REG_CONF);
 601                 data->beep_enable = (val >> 2) & 1;
 602
 603                 if (data->type != gl518sm_r00) {
 604                         data->voltage_in[0] =
 605                             gl518_read_value(client, GL518_REG_VDD);
 606                         data->voltage_in[1] =
 607                             gl518_read_value(client, GL518_REG_VIN1);
 608                         data->voltage_in[2] =
 609                             gl518_read_value(client, GL518_REG_VIN2);
 610                 }
 611                 data->voltage_in[3] =
 612                     gl518_read_value(client, GL518_REG_VIN3);
 613
 614                 data->last_updated = jiffies;
 615                 data->valid = 1;
 616         }
 617
 618         mutex_unlock(&data->update_lock);
 619
 620         return data;
 621 }
 622
 623 static int __init sensors_gl518sm_init(void)
 624 {
 625         return i2c_add_driver(&gl518_driver);
 626 }
 627
 628 static void __exit sensors_gl518sm_exit(void)
 629 {
 630         i2c_del_driver(&gl518_driver);
 631 }
 632
 633 MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>, "
 634         "Kyosti Malkki <kmalkki@cc.hut.fi> and "
 635         "Hong-Gunn Chew <hglinux@gunnet.org>");
 636 MODULE_DESCRIPTION("GL518SM driver");
 637 MODULE_LICENSE("GPL");
 638
 639 module_init(sensors_gl518sm_init);
 640 module_exit(sensors_gl518sm_exit);