linux/drivers/hwmon/gl518sm.c
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   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 */
  47static const unsigned short normal_i2c[] = { 0x2c, 0x2d, I2C_CLIENT_END };
  48
  49enum chips { gl518sm_r00, gl518sm_r80 };
  50
  51/* Many GL518 constants specified below */
  52
  53/* The GL518 registers */
  54#define GL518_REG_CHIP_ID       0x00
  55#define GL518_REG_REVISION      0x01
  56#define GL518_REG_VENDOR_ID     0x02
  57#define GL518_REG_CONF          0x03
  58#define GL518_REG_TEMP_IN       0x04
  59#define GL518_REG_TEMP_MAX      0x05
  60#define GL518_REG_TEMP_HYST     0x06
  61#define GL518_REG_FAN_COUNT     0x07
  62#define GL518_REG_FAN_LIMIT     0x08
  63#define GL518_REG_VIN1_LIMIT    0x09
  64#define GL518_REG_VIN2_LIMIT    0x0a
  65#define GL518_REG_VIN3_LIMIT    0x0b
  66#define GL518_REG_VDD_LIMIT     0x0c
  67#define GL518_REG_VIN3          0x0d
  68#define GL518_REG_MISC          0x0f
  69#define GL518_REG_ALARM         0x10
  70#define GL518_REG_MASK          0x11
  71#define GL518_REG_INT           0x12
  72#define GL518_REG_VIN2          0x13
  73#define GL518_REG_VIN1          0x14
  74#define GL518_REG_VDD           0x15
  75
  76
  77/*
  78 * Conversions. Rounding and limit checking is only done on the TO_REG
  79 * variants. Note that you should be a bit careful with which arguments
  80 * these macros are called: arguments may be evaluated more than once.
  81 * Fixing this is just not worth it.
  82 */
  83
  84#define RAW_FROM_REG(val)       val
  85
  86#define BOOL_FROM_REG(val)      ((val) ? 0 : 1)
  87#define BOOL_TO_REG(val)        ((val) ? 0 : 1)
  88
  89#define TEMP_TO_REG(val)        SENSORS_LIMIT(((((val) < 0 ? \
  90                                (val) - 500 : \
  91                                (val) + 500) / 1000) + 119), 0, 255)
  92#define TEMP_FROM_REG(val)      (((val) - 119) * 1000)
  93
  94static 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, 960000) * div;
 100        return SENSORS_LIMIT((480000 + rpmdiv / 2) / rpmdiv, 1, 255);
 101}
 102#define FAN_FROM_REG(val, div)  ((val) == 0 ? 0 : (480000 / ((val) * (div))))
 103
 104#define IN_TO_REG(val)          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_FROM_REG(val)       (1 << (val))
 111
 112#define BEEP_MASK_TO_REG(val)   ((val) & 0x7f & data->alarm_mask)
 113#define BEEP_MASK_FROM_REG(val) ((val) & 0x7f)
 114
 115/* Each client has this additional data */
 116struct gl518_data {
 117        struct device *hwmon_dev;
 118        enum chips type;
 119
 120        struct mutex update_lock;
 121        char valid;             /* !=0 if following fields are valid */
 122        unsigned long last_updated;     /* In jiffies */
 123
 124        u8 voltage_in[4];       /* Register values; [0] = VDD */
 125        u8 voltage_min[4];      /* Register values; [0] = VDD */
 126        u8 voltage_max[4];      /* Register values; [0] = VDD */
 127        u8 fan_in[2];
 128        u8 fan_min[2];
 129        u8 fan_div[2];          /* Register encoding, shifted right */
 130        u8 fan_auto1;           /* Boolean */
 131        u8 temp_in;             /* Register values */
 132        u8 temp_max;            /* Register values */
 133        u8 temp_hyst;           /* Register values */
 134        u8 alarms;              /* Register value */
 135        u8 alarm_mask;
 136        u8 beep_mask;           /* Register value */
 137        u8 beep_enable;         /* Boolean */
 138};
 139
 140static int gl518_probe(struct i2c_client *client,
 141                       const struct i2c_device_id *id);
 142static int gl518_detect(struct i2c_client *client, struct i2c_board_info *info);
 143static void gl518_init_client(struct i2c_client *client);
 144static int gl518_remove(struct i2c_client *client);
 145static int gl518_read_value(struct i2c_client *client, u8 reg);
 146static int gl518_write_value(struct i2c_client *client, u8 reg, u16 value);
 147static struct gl518_data *gl518_update_device(struct device *dev);
 148
 149static const struct i2c_device_id gl518_id[] = {
 150        { "gl518sm", 0 },
 151        { }
 152};
 153MODULE_DEVICE_TABLE(i2c, gl518_id);
 154
 155/* This is the driver that will be inserted */
 156static struct i2c_driver gl518_driver = {
 157        .class          = I2C_CLASS_HWMON,
 158        .driver = {
 159                .name   = "gl518sm",
 160        },
 161        .probe          = gl518_probe,
 162        .remove         = gl518_remove,
 163        .id_table       = gl518_id,
 164        .detect         = gl518_detect,
 165        .address_list   = normal_i2c,
 166};
 167
 168/*
 169 * Sysfs stuff
 170 */
 171
 172#define show(type, suffix, value)                                       \
 173static ssize_t show_##suffix(struct device *dev,                        \
 174                             struct device_attribute *attr, char *buf)  \
 175{                                                                       \
 176        struct gl518_data *data = gl518_update_device(dev);             \
 177        return sprintf(buf, "%d\n", type##_FROM_REG(data->value));      \
 178}
 179
 180show(TEMP, temp_input1, temp_in);
 181show(TEMP, temp_max1, temp_max);
 182show(TEMP, temp_hyst1, temp_hyst);
 183show(BOOL, fan_auto1, fan_auto1);
 184show(VDD, in_input0, voltage_in[0]);
 185show(IN, in_input1, voltage_in[1]);
 186show(IN, in_input2, voltage_in[2]);
 187show(IN, in_input3, voltage_in[3]);
 188show(VDD, in_min0, voltage_min[0]);
 189show(IN, in_min1, voltage_min[1]);
 190show(IN, in_min2, voltage_min[2]);
 191show(IN, in_min3, voltage_min[3]);
 192show(VDD, in_max0, voltage_max[0]);
 193show(IN, in_max1, voltage_max[1]);
 194show(IN, in_max2, voltage_max[2]);
 195show(IN, in_max3, voltage_max[3]);
 196show(RAW, alarms, alarms);
 197show(BOOL, beep_enable, beep_enable);
 198show(BEEP_MASK, beep_mask, beep_mask);
 199
 200static ssize_t show_fan_input(struct device *dev,
 201                              struct device_attribute *attr, char *buf)
 202{
 203        int nr = to_sensor_dev_attr(attr)->index;
 204        struct gl518_data *data = gl518_update_device(dev);
 205        return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_in[nr],
 206                                        DIV_FROM_REG(data->fan_div[nr])));
 207}
 208
 209static ssize_t show_fan_min(struct device *dev,
 210                            struct device_attribute *attr, char *buf)
 211{
 212        int nr = to_sensor_dev_attr(attr)->index;
 213        struct gl518_data *data = gl518_update_device(dev);
 214        return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[nr],
 215                                        DIV_FROM_REG(data->fan_div[nr])));
 216}
 217
 218static ssize_t show_fan_div(struct device *dev,
 219                            struct device_attribute *attr, char *buf)
 220{
 221        int nr = to_sensor_dev_attr(attr)->index;
 222        struct gl518_data *data = gl518_update_device(dev);
 223        return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]));
 224}
 225
 226#define set(type, suffix, value, reg)                                   \
 227static ssize_t set_##suffix(struct device *dev,                         \
 228                            struct device_attribute *attr,              \
 229                            const char *buf, size_t count)              \
 230{                                                                       \
 231        struct i2c_client *client = to_i2c_client(dev);                 \
 232        struct gl518_data *data = i2c_get_clientdata(client);           \
 233        long val;                                                       \
 234        int err = kstrtol(buf, 10, &val);                               \
 235        if (err)                                                        \
 236                return err;                                             \
 237                                                                        \
 238        mutex_lock(&data->update_lock);                                 \
 239        data->value = type##_TO_REG(val);                               \
 240        gl518_write_value(client, reg, data->value);                    \
 241        mutex_unlock(&data->update_lock);                               \
 242        return count;                                                   \
 243}
 244
 245#define set_bits(type, suffix, value, reg, mask, shift)                 \
 246static ssize_t set_##suffix(struct device *dev,                         \
 247                            struct device_attribute *attr,              \
 248                            const char *buf, size_t count)              \
 249{                                                                       \
 250        struct i2c_client *client = to_i2c_client(dev);                 \
 251        struct gl518_data *data = i2c_get_clientdata(client);           \
 252        int regvalue;                                                   \
 253        unsigned long val;                                              \
 254        int err = kstrtoul(buf, 10, &val);                              \
 255        if (err)                                                        \
 256                return err;                                             \
 257                                                                        \
 258        mutex_lock(&data->update_lock);                                 \
 259        regvalue = gl518_read_value(client, reg);                       \
 260        data->value = type##_TO_REG(val);                               \
 261        regvalue = (regvalue & ~mask) | (data->value << shift);         \
 262        gl518_write_value(client, reg, regvalue);                       \
 263        mutex_unlock(&data->update_lock);                               \
 264        return count;                                                   \
 265}
 266
 267#define set_low(type, suffix, value, reg)                               \
 268        set_bits(type, suffix, value, reg, 0x00ff, 0)
 269#define set_high(type, suffix, value, reg)                              \
 270        set_bits(type, suffix, value, reg, 0xff00, 8)
 271
 272set(TEMP, temp_max1, temp_max, GL518_REG_TEMP_MAX);
 273set(TEMP, temp_hyst1, temp_hyst, GL518_REG_TEMP_HYST);
 274set_bits(BOOL, fan_auto1, fan_auto1, GL518_REG_MISC, 0x08, 3);
 275set_low(VDD, in_min0, voltage_min[0], GL518_REG_VDD_LIMIT);
 276set_low(IN, in_min1, voltage_min[1], GL518_REG_VIN1_LIMIT);
 277set_low(IN, in_min2, voltage_min[2], GL518_REG_VIN2_LIMIT);
 278set_low(IN, in_min3, voltage_min[3], GL518_REG_VIN3_LIMIT);
 279set_high(VDD, in_max0, voltage_max[0], GL518_REG_VDD_LIMIT);
 280set_high(IN, in_max1, voltage_max[1], GL518_REG_VIN1_LIMIT);
 281set_high(IN, in_max2, voltage_max[2], GL518_REG_VIN2_LIMIT);
 282set_high(IN, in_max3, voltage_max[3], GL518_REG_VIN3_LIMIT);
 283set_bits(BOOL, beep_enable, beep_enable, GL518_REG_CONF, 0x04, 2);
 284set(BEEP_MASK, beep_mask, beep_mask, GL518_REG_ALARM);
 285
 286static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr,
 287                           const char *buf, size_t count)
 288{
 289        struct i2c_client *client = to_i2c_client(dev);
 290        struct gl518_data *data = i2c_get_clientdata(client);
 291        int nr = to_sensor_dev_attr(attr)->index;
 292        int regvalue;
 293        unsigned long val;
 294        int err;
 295
 296        err = kstrtoul(buf, 10, &val);
 297        if (err)
 298                return err;
 299
 300        mutex_lock(&data->update_lock);
 301        regvalue = gl518_read_value(client, GL518_REG_FAN_LIMIT);
 302        data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
 303        regvalue = (regvalue & (0xff << (8 * nr)))
 304                 | (data->fan_min[nr] << (8 * (1 - nr)));
 305        gl518_write_value(client, GL518_REG_FAN_LIMIT, regvalue);
 306
 307        data->beep_mask = gl518_read_value(client, GL518_REG_ALARM);
 308        if (data->fan_min[nr] == 0)
 309                data->alarm_mask &= ~(0x20 << nr);
 310        else
 311                data->alarm_mask |= (0x20 << nr);
 312        data->beep_mask &= data->alarm_mask;
 313        gl518_write_value(client, GL518_REG_ALARM, data->beep_mask);
 314
 315        mutex_unlock(&data->update_lock);
 316        return count;
 317}
 318
 319static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr,
 320                           const char *buf, size_t count)
 321{
 322        struct i2c_client *client = to_i2c_client(dev);
 323        struct gl518_data *data = i2c_get_clientdata(client);
 324        int nr = to_sensor_dev_attr(attr)->index;
 325        int regvalue;
 326        unsigned long val;
 327        int err;
 328
 329        err = kstrtoul(buf, 10, &val);
 330        if (err)
 331                return err;
 332
 333        switch (val) {
 334        case 1:
 335                val = 0;
 336                break;
 337        case 2:
 338                val = 1;
 339                break;
 340        case 4:
 341                val = 2;
 342                break;
 343        case 8:
 344                val = 3;
 345                break;
 346        default:
 347                dev_err(dev, "Invalid fan clock divider %lu, choose one "
 348                        "of 1, 2, 4 or 8\n", val);
 349                return -EINVAL;
 350        }
 351
 352        mutex_lock(&data->update_lock);
 353        regvalue = gl518_read_value(client, GL518_REG_MISC);
 354        data->fan_div[nr] = val;
 355        regvalue = (regvalue & ~(0xc0 >> (2 * nr)))
 356                 | (data->fan_div[nr] << (6 - 2 * nr));
 357        gl518_write_value(client, GL518_REG_MISC, regvalue);
 358        mutex_unlock(&data->update_lock);
 359        return count;
 360}
 361
 362static DEVICE_ATTR(temp1_input, S_IRUGO, show_temp_input1, NULL);
 363static DEVICE_ATTR(temp1_max, S_IWUSR|S_IRUGO, show_temp_max1, set_temp_max1);
 364static DEVICE_ATTR(temp1_max_hyst, S_IWUSR|S_IRUGO,
 365        show_temp_hyst1, set_temp_hyst1);
 366static DEVICE_ATTR(fan1_auto, S_IWUSR|S_IRUGO, show_fan_auto1, set_fan_auto1);
 367static SENSOR_DEVICE_ATTR(fan1_input, S_IRUGO, show_fan_input, NULL, 0);
 368static SENSOR_DEVICE_ATTR(fan2_input, S_IRUGO, show_fan_input, NULL, 1);
 369static SENSOR_DEVICE_ATTR(fan1_min, S_IWUSR|S_IRUGO,
 370        show_fan_min, set_fan_min, 0);
 371static SENSOR_DEVICE_ATTR(fan2_min, S_IWUSR|S_IRUGO,
 372        show_fan_min, set_fan_min, 1);
 373static SENSOR_DEVICE_ATTR(fan1_div, S_IWUSR|S_IRUGO,
 374        show_fan_div, set_fan_div, 0);
 375static SENSOR_DEVICE_ATTR(fan2_div, S_IWUSR|S_IRUGO,
 376        show_fan_div, set_fan_div, 1);
 377static DEVICE_ATTR(in0_input, S_IRUGO, show_in_input0, NULL);
 378static DEVICE_ATTR(in1_input, S_IRUGO, show_in_input1, NULL);
 379static DEVICE_ATTR(in2_input, S_IRUGO, show_in_input2, NULL);
 380static DEVICE_ATTR(in3_input, S_IRUGO, show_in_input3, NULL);
 381static DEVICE_ATTR(in0_min, S_IWUSR|S_IRUGO, show_in_min0, set_in_min0);
 382static DEVICE_ATTR(in1_min, S_IWUSR|S_IRUGO, show_in_min1, set_in_min1);
 383static DEVICE_ATTR(in2_min, S_IWUSR|S_IRUGO, show_in_min2, set_in_min2);
 384static DEVICE_ATTR(in3_min, S_IWUSR|S_IRUGO, show_in_min3, set_in_min3);
 385static DEVICE_ATTR(in0_max, S_IWUSR|S_IRUGO, show_in_max0, set_in_max0);
 386static DEVICE_ATTR(in1_max, S_IWUSR|S_IRUGO, show_in_max1, set_in_max1);
 387static DEVICE_ATTR(in2_max, S_IWUSR|S_IRUGO, show_in_max2, set_in_max2);
 388static DEVICE_ATTR(in3_max, S_IWUSR|S_IRUGO, show_in_max3, set_in_max3);
 389static DEVICE_ATTR(alarms, S_IRUGO, show_alarms, NULL);
 390static DEVICE_ATTR(beep_enable, S_IWUSR|S_IRUGO,
 391        show_beep_enable, set_beep_enable);
 392static DEVICE_ATTR(beep_mask, S_IWUSR|S_IRUGO,
 393        show_beep_mask, set_beep_mask);
 394
 395static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
 396                          char *buf)
 397{
 398        int bitnr = to_sensor_dev_attr(attr)->index;
 399        struct gl518_data *data = gl518_update_device(dev);
 400        return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
 401}
 402
 403static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
 404static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
 405static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
 406static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
 407static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4);
 408static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 5);
 409static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 6);
 410
 411static ssize_t show_beep(struct device *dev, struct device_attribute *attr,
 412                          char *buf)
 413{
 414        int bitnr = to_sensor_dev_attr(attr)->index;
 415        struct gl518_data *data = gl518_update_device(dev);
 416        return sprintf(buf, "%u\n", (data->beep_mask >> bitnr) & 1);
 417}
 418
 419static ssize_t set_beep(struct device *dev, struct device_attribute *attr,
 420                        const char *buf, size_t count)
 421{
 422        struct i2c_client *client = to_i2c_client(dev);
 423        struct gl518_data *data = i2c_get_clientdata(client);
 424        int bitnr = to_sensor_dev_attr(attr)->index;
 425        unsigned long bit;
 426        int err;
 427
 428        err = kstrtoul(buf, 10, &bit);
 429        if (err)
 430                return err;
 431
 432        if (bit & ~1)
 433                return -EINVAL;
 434
 435        mutex_lock(&data->update_lock);
 436        data->beep_mask = gl518_read_value(client, GL518_REG_ALARM);
 437        if (bit)
 438                data->beep_mask |= (1 << bitnr);
 439        else
 440                data->beep_mask &= ~(1 << bitnr);
 441        gl518_write_value(client, GL518_REG_ALARM, data->beep_mask);
 442        mutex_unlock(&data->update_lock);
 443        return count;
 444}
 445
 446static SENSOR_DEVICE_ATTR(in0_beep, S_IRUGO|S_IWUSR, show_beep, set_beep, 0);
 447static SENSOR_DEVICE_ATTR(in1_beep, S_IRUGO|S_IWUSR, show_beep, set_beep, 1);
 448static SENSOR_DEVICE_ATTR(in2_beep, S_IRUGO|S_IWUSR, show_beep, set_beep, 2);
 449static SENSOR_DEVICE_ATTR(in3_beep, S_IRUGO|S_IWUSR, show_beep, set_beep, 3);
 450static SENSOR_DEVICE_ATTR(temp1_beep, S_IRUGO|S_IWUSR, show_beep, set_beep, 4);
 451static SENSOR_DEVICE_ATTR(fan1_beep, S_IRUGO|S_IWUSR, show_beep, set_beep, 5);
 452static SENSOR_DEVICE_ATTR(fan2_beep, S_IRUGO|S_IWUSR, show_beep, set_beep, 6);
 453
 454static struct attribute *gl518_attributes[] = {
 455        &dev_attr_in3_input.attr,
 456        &dev_attr_in0_min.attr,
 457        &dev_attr_in1_min.attr,
 458        &dev_attr_in2_min.attr,
 459        &dev_attr_in3_min.attr,
 460        &dev_attr_in0_max.attr,
 461        &dev_attr_in1_max.attr,
 462        &dev_attr_in2_max.attr,
 463        &dev_attr_in3_max.attr,
 464        &sensor_dev_attr_in0_alarm.dev_attr.attr,
 465        &sensor_dev_attr_in1_alarm.dev_attr.attr,
 466        &sensor_dev_attr_in2_alarm.dev_attr.attr,
 467        &sensor_dev_attr_in3_alarm.dev_attr.attr,
 468        &sensor_dev_attr_in0_beep.dev_attr.attr,
 469        &sensor_dev_attr_in1_beep.dev_attr.attr,
 470        &sensor_dev_attr_in2_beep.dev_attr.attr,
 471        &sensor_dev_attr_in3_beep.dev_attr.attr,
 472
 473        &dev_attr_fan1_auto.attr,
 474        &sensor_dev_attr_fan1_input.dev_attr.attr,
 475        &sensor_dev_attr_fan2_input.dev_attr.attr,
 476        &sensor_dev_attr_fan1_min.dev_attr.attr,
 477        &sensor_dev_attr_fan2_min.dev_attr.attr,
 478        &sensor_dev_attr_fan1_div.dev_attr.attr,
 479        &sensor_dev_attr_fan2_div.dev_attr.attr,
 480        &sensor_dev_attr_fan1_alarm.dev_attr.attr,
 481        &sensor_dev_attr_fan2_alarm.dev_attr.attr,
 482        &sensor_dev_attr_fan1_beep.dev_attr.attr,
 483        &sensor_dev_attr_fan2_beep.dev_attr.attr,
 484
 485        &dev_attr_temp1_input.attr,
 486        &dev_attr_temp1_max.attr,
 487        &dev_attr_temp1_max_hyst.attr,
 488        &sensor_dev_attr_temp1_alarm.dev_attr.attr,
 489        &sensor_dev_attr_temp1_beep.dev_attr.attr,
 490
 491        &dev_attr_alarms.attr,
 492        &dev_attr_beep_enable.attr,
 493        &dev_attr_beep_mask.attr,
 494        NULL
 495};
 496
 497static const struct attribute_group gl518_group = {
 498        .attrs = gl518_attributes,
 499};
 500
 501static struct attribute *gl518_attributes_r80[] = {
 502        &dev_attr_in0_input.attr,
 503        &dev_attr_in1_input.attr,
 504        &dev_attr_in2_input.attr,
 505        NULL
 506};
 507
 508static const struct attribute_group gl518_group_r80 = {
 509        .attrs = gl518_attributes_r80,
 510};
 511
 512/*
 513 * Real code
 514 */
 515
 516/* Return 0 if detection is successful, -ENODEV otherwise */
 517static int gl518_detect(struct i2c_client *client, struct i2c_board_info *info)
 518{
 519        struct i2c_adapter *adapter = client->adapter;
 520        int rev;
 521
 522        if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
 523                                     I2C_FUNC_SMBUS_WORD_DATA))
 524                return -ENODEV;
 525
 526        /* Now, we do the remaining detection. */
 527        if ((gl518_read_value(client, GL518_REG_CHIP_ID) != 0x80)
 528         || (gl518_read_value(client, GL518_REG_CONF) & 0x80))
 529                return -ENODEV;
 530
 531        /* Determine the chip type. */
 532        rev = gl518_read_value(client, GL518_REG_REVISION);
 533        if (rev != 0x00 && rev != 0x80)
 534                return -ENODEV;
 535
 536        strlcpy(info->type, "gl518sm", I2C_NAME_SIZE);
 537
 538        return 0;
 539}
 540
 541static int gl518_probe(struct i2c_client *client,
 542                       const struct i2c_device_id *id)
 543{
 544        struct gl518_data *data;
 545        int err, revision;
 546
 547        data = devm_kzalloc(&client->dev, sizeof(struct gl518_data),
 548                            GFP_KERNEL);
 549        if (!data)
 550                return -ENOMEM;
 551
 552        i2c_set_clientdata(client, data);
 553        revision = gl518_read_value(client, GL518_REG_REVISION);
 554        data->type = revision == 0x80 ? gl518sm_r80 : gl518sm_r00;
 555        mutex_init(&data->update_lock);
 556
 557        /* Initialize the GL518SM chip */
 558        data->alarm_mask = 0xff;
 559        gl518_init_client(client);
 560
 561        /* Register sysfs hooks */
 562        err = sysfs_create_group(&client->dev.kobj, &gl518_group);
 563        if (err)
 564                return err;
 565        if (data->type == gl518sm_r80) {
 566                err = sysfs_create_group(&client->dev.kobj, &gl518_group_r80);
 567                if (err)
 568                        goto exit_remove_files;
 569        }
 570
 571        data->hwmon_dev = hwmon_device_register(&client->dev);
 572        if (IS_ERR(data->hwmon_dev)) {
 573                err = PTR_ERR(data->hwmon_dev);
 574                goto exit_remove_files;
 575        }
 576
 577        return 0;
 578
 579exit_remove_files:
 580        sysfs_remove_group(&client->dev.kobj, &gl518_group);
 581        if (data->type == gl518sm_r80)
 582                sysfs_remove_group(&client->dev.kobj, &gl518_group_r80);
 583        return err;
 584}
 585
 586
 587/*
 588 * Called when we have found a new GL518SM.
 589 * Note that we preserve D4:NoFan2 and D2:beep_enable.
 590 */
 591static void gl518_init_client(struct i2c_client *client)
 592{
 593        /* Make sure we leave D7:Reset untouched */
 594        u8 regvalue = gl518_read_value(client, GL518_REG_CONF) & 0x7f;
 595
 596        /* Comparator mode (D3=0), standby mode (D6=0) */
 597        gl518_write_value(client, GL518_REG_CONF, (regvalue &= 0x37));
 598
 599        /* Never interrupts */
 600        gl518_write_value(client, GL518_REG_MASK, 0x00);
 601
 602        /* Clear status register (D5=1), start (D6=1) */
 603        gl518_write_value(client, GL518_REG_CONF, 0x20 | regvalue);
 604        gl518_write_value(client, GL518_REG_CONF, 0x40 | regvalue);
 605}
 606
 607static int gl518_remove(struct i2c_client *client)
 608{
 609        struct gl518_data *data = i2c_get_clientdata(client);
 610
 611        hwmon_device_unregister(data->hwmon_dev);
 612        sysfs_remove_group(&client->dev.kobj, &gl518_group);
 613        if (data->type == gl518sm_r80)
 614                sysfs_remove_group(&client->dev.kobj, &gl518_group_r80);
 615
 616        return 0;
 617}
 618
 619/*
 620 * Registers 0x07 to 0x0c are word-sized, others are byte-sized
 621 * GL518 uses a high-byte first convention, which is exactly opposite to
 622 * the SMBus standard.
 623 */
 624static int gl518_read_value(struct i2c_client *client, u8 reg)
 625{
 626        if ((reg >= 0x07) && (reg <= 0x0c))
 627                return i2c_smbus_read_word_swapped(client, reg);
 628        else
 629                return i2c_smbus_read_byte_data(client, reg);
 630}
 631
 632static int gl518_write_value(struct i2c_client *client, u8 reg, u16 value)
 633{
 634        if ((reg >= 0x07) && (reg <= 0x0c))
 635                return i2c_smbus_write_word_swapped(client, reg, value);
 636        else
 637                return i2c_smbus_write_byte_data(client, reg, value);
 638}
 639
 640static struct gl518_data *gl518_update_device(struct device *dev)
 641{
 642        struct i2c_client *client = to_i2c_client(dev);
 643        struct gl518_data *data = i2c_get_clientdata(client);
 644        int val;
 645
 646        mutex_lock(&data->update_lock);
 647
 648        if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
 649            || !data->valid) {
 650                dev_dbg(&client->dev, "Starting gl518 update\n");
 651
 652                data->alarms = gl518_read_value(client, GL518_REG_INT);
 653                data->beep_mask = gl518_read_value(client, GL518_REG_ALARM);
 654
 655                val = gl518_read_value(client, GL518_REG_VDD_LIMIT);
 656                data->voltage_min[0] = val & 0xff;
 657                data->voltage_max[0] = (val >> 8) & 0xff;
 658                val = gl518_read_value(client, GL518_REG_VIN1_LIMIT);
 659                data->voltage_min[1] = val & 0xff;
 660                data->voltage_max[1] = (val >> 8) & 0xff;
 661                val = gl518_read_value(client, GL518_REG_VIN2_LIMIT);
 662                data->voltage_min[2] = val & 0xff;
 663                data->voltage_max[2] = (val >> 8) & 0xff;
 664                val = gl518_read_value(client, GL518_REG_VIN3_LIMIT);
 665                data->voltage_min[3] = val & 0xff;
 666                data->voltage_max[3] = (val >> 8) & 0xff;
 667
 668                val = gl518_read_value(client, GL518_REG_FAN_COUNT);
 669                data->fan_in[0] = (val >> 8) & 0xff;
 670                data->fan_in[1] = val & 0xff;
 671
 672                val = gl518_read_value(client, GL518_REG_FAN_LIMIT);
 673                data->fan_min[0] = (val >> 8) & 0xff;
 674                data->fan_min[1] = val & 0xff;
 675
 676                data->temp_in = gl518_read_value(client, GL518_REG_TEMP_IN);
 677                data->temp_max =
 678                    gl518_read_value(client, GL518_REG_TEMP_MAX);
 679                data->temp_hyst =
 680                    gl518_read_value(client, GL518_REG_TEMP_HYST);
 681
 682                val = gl518_read_value(client, GL518_REG_MISC);
 683                data->fan_div[0] = (val >> 6) & 0x03;
 684                data->fan_div[1] = (val >> 4) & 0x03;
 685                data->fan_auto1  = (val >> 3) & 0x01;
 686
 687                data->alarms &= data->alarm_mask;
 688
 689                val = gl518_read_value(client, GL518_REG_CONF);
 690                data->beep_enable = (val >> 2) & 1;
 691
 692                if (data->type != gl518sm_r00) {
 693                        data->voltage_in[0] =
 694                            gl518_read_value(client, GL518_REG_VDD);
 695                        data->voltage_in[1] =
 696                            gl518_read_value(client, GL518_REG_VIN1);
 697                        data->voltage_in[2] =
 698                            gl518_read_value(client, GL518_REG_VIN2);
 699                }
 700                data->voltage_in[3] =
 701                    gl518_read_value(client, GL518_REG_VIN3);
 702
 703                data->last_updated = jiffies;
 704                data->valid = 1;
 705        }
 706
 707        mutex_unlock(&data->update_lock);
 708
 709        return data;
 710}
 711
 712module_i2c_driver(gl518_driver);
 713
 714MODULE_AUTHOR("Frodo Looijaard <frodol@dds.nl>, "
 715        "Kyosti Malkki <kmalkki@cc.hut.fi> and "
 716        "Hong-Gunn Chew <hglinux@gunnet.org>");
 717MODULE_DESCRIPTION("GL518SM driver");
 718MODULE_LICENSE("GPL");
 719
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