drivers/hwmon/asb100.c

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This source file includes following definitions.
IN_TO_REG
IN_FROM_REG
FAN_TO_REG
FAN_FROM_REG
TEMP_TO_REG
TEMP_FROM_REG
ASB100_PWM_TO_REG
ASB100_PWM_FROM_REG
DIV_TO_REG
show_fan
show_fan_min
show_fan_div
set_fan_min
set_fan_div
sprintf_temp_from_reg
cpu0_vid_show
vrm_show
vrm_store
alarms_show
show_alarm
pwm1_show
pwm1_store
pwm1_enable_show
pwm1_enable_store
asb100_detect_subclients
asb100_detect
asb100_probe
asb100_remove
asb100_read_value
asb100_write_value
asb100_init_client
asb100_update_device
   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * asb100.c - Part of lm_sensors, Linux kernel modules for hardware
   4  *            monitoring
   5  *
   6  * Copyright (C) 2004 Mark M. Hoffman <mhoffman@lightlink.com>
   7  *
   8  * (derived from w83781d.c)
   9  *
  10  * Copyright (C) 1998 - 2003  Frodo Looijaard <frodol@dds.nl>,
  11  *                            Philip Edelbrock <phil@netroedge.com>, and
  12  *                            Mark Studebaker <mdsxyz123@yahoo.com>
  13  */
  14 
  15 /*
  16  * This driver supports the hardware sensor chips: Asus ASB100 and
  17  * ASB100-A "BACH".
  18  *
  19  * ASB100-A supports pwm1, while plain ASB100 does not.  There is no known
  20  * way for the driver to tell which one is there.
  21  *
  22  * Chip         #vin    #fanin  #pwm    #temp   wchipid vendid  i2c     ISA
  23  * asb100       7       3       1       4       0x31    0x0694  yes     no
  24  */
  25 
  26 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  27 
  28 #include <linux/module.h>
  29 #include <linux/slab.h>
  30 #include <linux/i2c.h>
  31 #include <linux/hwmon.h>
  32 #include <linux/hwmon-sysfs.h>
  33 #include <linux/hwmon-vid.h>
  34 #include <linux/err.h>
  35 #include <linux/init.h>
  36 #include <linux/jiffies.h>
  37 #include <linux/mutex.h>
  38 #include "lm75.h"
  39 
  40 /* I2C addresses to scan */
  41 static const unsigned short normal_i2c[] = { 0x2d, I2C_CLIENT_END };
  42 
  43 static unsigned short force_subclients[4];
  44 module_param_array(force_subclients, short, NULL, 0);
  45 MODULE_PARM_DESC(force_subclients,
  46         "List of subclient addresses: {bus, clientaddr, subclientaddr1, subclientaddr2}");
  47 
  48 /* Voltage IN registers 0-6 */
  49 #define ASB100_REG_IN(nr)       (0x20 + (nr))
  50 #define ASB100_REG_IN_MAX(nr)   (0x2b + (nr * 2))
  51 #define ASB100_REG_IN_MIN(nr)   (0x2c + (nr * 2))
  52 
  53 /* FAN IN registers 1-3 */
  54 #define ASB100_REG_FAN(nr)      (0x28 + (nr))
  55 #define ASB100_REG_FAN_MIN(nr)  (0x3b + (nr))
  56 
  57 /* TEMPERATURE registers 1-4 */
  58 static const u16 asb100_reg_temp[]      = {0, 0x27, 0x150, 0x250, 0x17};
  59 static const u16 asb100_reg_temp_max[]  = {0, 0x39, 0x155, 0x255, 0x18};
  60 static const u16 asb100_reg_temp_hyst[] = {0, 0x3a, 0x153, 0x253, 0x19};
  61 
  62 #define ASB100_REG_TEMP(nr) (asb100_reg_temp[nr])
  63 #define ASB100_REG_TEMP_MAX(nr) (asb100_reg_temp_max[nr])
  64 #define ASB100_REG_TEMP_HYST(nr) (asb100_reg_temp_hyst[nr])
  65 
  66 #define ASB100_REG_TEMP2_CONFIG 0x0152
  67 #define ASB100_REG_TEMP3_CONFIG 0x0252
  68 
  69 
  70 #define ASB100_REG_CONFIG       0x40
  71 #define ASB100_REG_ALARM1       0x41
  72 #define ASB100_REG_ALARM2       0x42
  73 #define ASB100_REG_SMIM1        0x43
  74 #define ASB100_REG_SMIM2        0x44
  75 #define ASB100_REG_VID_FANDIV   0x47
  76 #define ASB100_REG_I2C_ADDR     0x48
  77 #define ASB100_REG_CHIPID       0x49
  78 #define ASB100_REG_I2C_SUBADDR  0x4a
  79 #define ASB100_REG_PIN          0x4b
  80 #define ASB100_REG_IRQ          0x4c
  81 #define ASB100_REG_BANK         0x4e
  82 #define ASB100_REG_CHIPMAN      0x4f
  83 
  84 #define ASB100_REG_WCHIPID      0x58
  85 
  86 /* bit 7 -> enable, bits 0-3 -> duty cycle */
  87 #define ASB100_REG_PWM1         0x59
  88 
  89 /*
  90  * CONVERSIONS
  91  * Rounding and limit checking is only done on the TO_REG variants.
  92  */
  93 
  94 /* These constants are a guess, consistent w/ w83781d */
  95 #define ASB100_IN_MIN           0
  96 #define ASB100_IN_MAX           4080
  97 
  98 /*
  99  * IN: 1/1000 V (0V to 4.08V)
 100  * REG: 16mV/bit
 101  */
 102 static u8 IN_TO_REG(unsigned val)
 103 {
 104         unsigned nval = clamp_val(val, ASB100_IN_MIN, ASB100_IN_MAX);
 105         return (nval + 8) / 16;
 106 }
 107 
 108 static unsigned IN_FROM_REG(u8 reg)
 109 {
 110         return reg * 16;
 111 }
 112 
 113 static u8 FAN_TO_REG(long rpm, int div)
 114 {
 115         if (rpm == -1)
 116                 return 0;
 117         if (rpm == 0)
 118                 return 255;
 119         rpm = clamp_val(rpm, 1, 1000000);
 120         return clamp_val((1350000 + rpm * div / 2) / (rpm * div), 1, 254);
 121 }
 122 
 123 static int FAN_FROM_REG(u8 val, int div)
 124 {
 125         return val == 0 ? -1 : val == 255 ? 0 : 1350000 / (val * div);
 126 }
 127 
 128 /* These constants are a guess, consistent w/ w83781d */
 129 #define ASB100_TEMP_MIN         -128000
 130 #define ASB100_TEMP_MAX         127000
 131 
 132 /*
 133  * TEMP: 0.001C/bit (-128C to +127C)
 134  * REG: 1C/bit, two's complement
 135  */
 136 static u8 TEMP_TO_REG(long temp)
 137 {
 138         int ntemp = clamp_val(temp, ASB100_TEMP_MIN, ASB100_TEMP_MAX);
 139         ntemp += (ntemp < 0 ? -500 : 500);
 140         return (u8)(ntemp / 1000);
 141 }
 142 
 143 static int TEMP_FROM_REG(u8 reg)
 144 {
 145         return (s8)reg * 1000;
 146 }
 147 
 148 /*
 149  * PWM: 0 - 255 per sensors documentation
 150  * REG: (6.25% duty cycle per bit)
 151  */
 152 static u8 ASB100_PWM_TO_REG(int pwm)
 153 {
 154         pwm = clamp_val(pwm, 0, 255);
 155         return (u8)(pwm / 16);
 156 }
 157 
 158 static int ASB100_PWM_FROM_REG(u8 reg)
 159 {
 160         return reg * 16;
 161 }
 162 
 163 #define DIV_FROM_REG(val) (1 << (val))
 164 
 165 /*
 166  * FAN DIV: 1, 2, 4, or 8 (defaults to 2)
 167  * REG: 0, 1, 2, or 3 (respectively) (defaults to 1)
 168  */
 169 static u8 DIV_TO_REG(long val)
 170 {
 171         return val == 8 ? 3 : val == 4 ? 2 : val == 1 ? 0 : 1;
 172 }
 173 
 174 /*
 175  * For each registered client, we need to keep some data in memory. That
 176  * data is pointed to by client->data. The structure itself is
 177  * dynamically allocated, at the same time the client itself is allocated.
 178  */
 179 struct asb100_data {
 180         struct device *hwmon_dev;
 181         struct mutex lock;
 182 
 183         struct mutex update_lock;
 184         unsigned long last_updated;     /* In jiffies */
 185 
 186         /* array of 2 pointers to subclients */
 187         struct i2c_client *lm75[2];
 188 
 189         char valid;             /* !=0 if following fields are valid */
 190         u8 in[7];               /* Register value */
 191         u8 in_max[7];           /* Register value */
 192         u8 in_min[7];           /* Register value */
 193         u8 fan[3];              /* Register value */
 194         u8 fan_min[3];          /* Register value */
 195         u16 temp[4];            /* Register value (0 and 3 are u8 only) */
 196         u16 temp_max[4];        /* Register value (0 and 3 are u8 only) */
 197         u16 temp_hyst[4];       /* Register value (0 and 3 are u8 only) */
 198         u8 fan_div[3];          /* Register encoding, right justified */
 199         u8 pwm;                 /* Register encoding */
 200         u8 vid;                 /* Register encoding, combined */
 201         u32 alarms;             /* Register encoding, combined */
 202         u8 vrm;
 203 };
 204 
 205 static int asb100_read_value(struct i2c_client *client, u16 reg);
 206 static void asb100_write_value(struct i2c_client *client, u16 reg, u16 val);
 207 
 208 static int asb100_probe(struct i2c_client *client,
 209                         const struct i2c_device_id *id);
 210 static int asb100_detect(struct i2c_client *client,
 211                          struct i2c_board_info *info);
 212 static int asb100_remove(struct i2c_client *client);
 213 static struct asb100_data *asb100_update_device(struct device *dev);
 214 static void asb100_init_client(struct i2c_client *client);
 215 
 216 static const struct i2c_device_id asb100_id[] = {
 217         { "asb100", 0 },
 218         { }
 219 };
 220 MODULE_DEVICE_TABLE(i2c, asb100_id);
 221 
 222 static struct i2c_driver asb100_driver = {
 223         .class          = I2C_CLASS_HWMON,
 224         .driver = {
 225                 .name   = "asb100",
 226         },
 227         .probe          = asb100_probe,
 228         .remove         = asb100_remove,
 229         .id_table       = asb100_id,
 230         .detect         = asb100_detect,
 231         .address_list   = normal_i2c,
 232 };
 233 
 234 /* 7 Voltages */
 235 #define show_in_reg(reg) \
 236 static ssize_t show_##reg(struct device *dev, struct device_attribute *attr, \
 237                 char *buf) \
 238 { \
 239         int nr = to_sensor_dev_attr(attr)->index; \
 240         struct asb100_data *data = asb100_update_device(dev); \
 241         return sprintf(buf, "%d\n", IN_FROM_REG(data->reg[nr])); \
 242 }
 243 
 244 show_in_reg(in)
 245 show_in_reg(in_min)
 246 show_in_reg(in_max)
 247 
 248 #define set_in_reg(REG, reg) \
 249 static ssize_t set_in_##reg(struct device *dev, struct device_attribute *attr, \
 250                 const char *buf, size_t count) \
 251 { \
 252         int nr = to_sensor_dev_attr(attr)->index; \
 253         struct i2c_client *client = to_i2c_client(dev); \
 254         struct asb100_data *data = i2c_get_clientdata(client); \
 255         unsigned long val; \
 256         int err = kstrtoul(buf, 10, &val); \
 257         if (err) \
 258                 return err; \
 259         mutex_lock(&data->update_lock); \
 260         data->in_##reg[nr] = IN_TO_REG(val); \
 261         asb100_write_value(client, ASB100_REG_IN_##REG(nr), \
 262                 data->in_##reg[nr]); \
 263         mutex_unlock(&data->update_lock); \
 264         return count; \
 265 }
 266 
 267 set_in_reg(MIN, min)
 268 set_in_reg(MAX, max)
 269 
 270 #define sysfs_in(offset) \
 271 static SENSOR_DEVICE_ATTR(in##offset##_input, S_IRUGO, \
 272                 show_in, NULL, offset); \
 273 static SENSOR_DEVICE_ATTR(in##offset##_min, S_IRUGO | S_IWUSR, \
 274                 show_in_min, set_in_min, offset); \
 275 static SENSOR_DEVICE_ATTR(in##offset##_max, S_IRUGO | S_IWUSR, \
 276                 show_in_max, set_in_max, offset)
 277 
 278 sysfs_in(0);
 279 sysfs_in(1);
 280 sysfs_in(2);
 281 sysfs_in(3);
 282 sysfs_in(4);
 283 sysfs_in(5);
 284 sysfs_in(6);
 285 
 286 /* 3 Fans */
 287 static ssize_t show_fan(struct device *dev, struct device_attribute *attr,
 288                 char *buf)
 289 {
 290         int nr = to_sensor_dev_attr(attr)->index;
 291         struct asb100_data *data = asb100_update_device(dev);
 292         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],
 293                 DIV_FROM_REG(data->fan_div[nr])));
 294 }
 295 
 296 static ssize_t show_fan_min(struct device *dev, struct device_attribute *attr,
 297                 char *buf)
 298 {
 299         int nr = to_sensor_dev_attr(attr)->index;
 300         struct asb100_data *data = asb100_update_device(dev);
 301         return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[nr],
 302                 DIV_FROM_REG(data->fan_div[nr])));
 303 }
 304 
 305 static ssize_t show_fan_div(struct device *dev, struct device_attribute *attr,
 306                 char *buf)
 307 {
 308         int nr = to_sensor_dev_attr(attr)->index;
 309         struct asb100_data *data = asb100_update_device(dev);
 310         return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[nr]));
 311 }
 312 
 313 static ssize_t set_fan_min(struct device *dev, struct device_attribute *attr,
 314                 const char *buf, size_t count)
 315 {
 316         int nr = to_sensor_dev_attr(attr)->index;
 317         struct i2c_client *client = to_i2c_client(dev);
 318         struct asb100_data *data = i2c_get_clientdata(client);
 319         unsigned long val;
 320         int err;
 321 
 322         err = kstrtoul(buf, 10, &val);
 323         if (err)
 324                 return err;
 325 
 326         mutex_lock(&data->update_lock);
 327         data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));
 328         asb100_write_value(client, ASB100_REG_FAN_MIN(nr), data->fan_min[nr]);
 329         mutex_unlock(&data->update_lock);
 330         return count;
 331 }
 332 
 333 /*
 334  * Note: we save and restore the fan minimum here, because its value is
 335  * determined in part by the fan divisor.  This follows the principle of
 336  * least surprise; the user doesn't expect the fan minimum to change just
 337  * because the divisor changed.
 338  */
 339 static ssize_t set_fan_div(struct device *dev, struct device_attribute *attr,
 340                 const char *buf, size_t count)
 341 {
 342         int nr = to_sensor_dev_attr(attr)->index;
 343         struct i2c_client *client = to_i2c_client(dev);
 344         struct asb100_data *data = i2c_get_clientdata(client);
 345         unsigned long min;
 346         int reg;
 347         unsigned long val;
 348         int err;
 349 
 350         err = kstrtoul(buf, 10, &val);
 351         if (err)
 352                 return err;
 353 
 354         mutex_lock(&data->update_lock);
 355 
 356         min = FAN_FROM_REG(data->fan_min[nr],
 357                         DIV_FROM_REG(data->fan_div[nr]));
 358         data->fan_div[nr] = DIV_TO_REG(val);
 359 
 360         switch (nr) {
 361         case 0: /* fan 1 */
 362                 reg = asb100_read_value(client, ASB100_REG_VID_FANDIV);
 363                 reg = (reg & 0xcf) | (data->fan_div[0] << 4);
 364                 asb100_write_value(client, ASB100_REG_VID_FANDIV, reg);
 365                 break;
 366 
 367         case 1: /* fan 2 */
 368                 reg = asb100_read_value(client, ASB100_REG_VID_FANDIV);
 369                 reg = (reg & 0x3f) | (data->fan_div[1] << 6);
 370                 asb100_write_value(client, ASB100_REG_VID_FANDIV, reg);
 371                 break;
 372 
 373         case 2: /* fan 3 */
 374                 reg = asb100_read_value(client, ASB100_REG_PIN);
 375                 reg = (reg & 0x3f) | (data->fan_div[2] << 6);
 376                 asb100_write_value(client, ASB100_REG_PIN, reg);
 377                 break;
 378         }
 379 
 380         data->fan_min[nr] =
 381                 FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));
 382         asb100_write_value(client, ASB100_REG_FAN_MIN(nr), data->fan_min[nr]);
 383 
 384         mutex_unlock(&data->update_lock);
 385 
 386         return count;
 387 }
 388 
 389 #define sysfs_fan(offset) \
 390 static SENSOR_DEVICE_ATTR(fan##offset##_input, S_IRUGO, \
 391                 show_fan, NULL, offset - 1); \
 392 static SENSOR_DEVICE_ATTR(fan##offset##_min, S_IRUGO | S_IWUSR, \
 393                 show_fan_min, set_fan_min, offset - 1); \
 394 static SENSOR_DEVICE_ATTR(fan##offset##_div, S_IRUGO | S_IWUSR, \
 395                 show_fan_div, set_fan_div, offset - 1)
 396 
 397 sysfs_fan(1);
 398 sysfs_fan(2);
 399 sysfs_fan(3);
 400 
 401 /* 4 Temp. Sensors */
 402 static int sprintf_temp_from_reg(u16 reg, char *buf, int nr)
 403 {
 404         int ret = 0;
 405 
 406         switch (nr) {
 407         case 1: case 2:
 408                 ret = sprintf(buf, "%d\n", LM75_TEMP_FROM_REG(reg));
 409                 break;
 410         case 0: case 3: default:
 411                 ret = sprintf(buf, "%d\n", TEMP_FROM_REG(reg));
 412                 break;
 413         }
 414         return ret;
 415 }
 416 
 417 #define show_temp_reg(reg) \
 418 static ssize_t show_##reg(struct device *dev, struct device_attribute *attr, \
 419                 char *buf) \
 420 { \
 421         int nr = to_sensor_dev_attr(attr)->index; \
 422         struct asb100_data *data = asb100_update_device(dev); \
 423         return sprintf_temp_from_reg(data->reg[nr], buf, nr); \
 424 }
 425 
 426 show_temp_reg(temp);
 427 show_temp_reg(temp_max);
 428 show_temp_reg(temp_hyst);
 429 
 430 #define set_temp_reg(REG, reg) \
 431 static ssize_t set_##reg(struct device *dev, struct device_attribute *attr, \
 432                 const char *buf, size_t count) \
 433 { \
 434         int nr = to_sensor_dev_attr(attr)->index; \
 435         struct i2c_client *client = to_i2c_client(dev); \
 436         struct asb100_data *data = i2c_get_clientdata(client); \
 437         long val; \
 438         int err = kstrtol(buf, 10, &val); \
 439         if (err) \
 440                 return err; \
 441         mutex_lock(&data->update_lock); \
 442         switch (nr) { \
 443         case 1: case 2: \
 444                 data->reg[nr] = LM75_TEMP_TO_REG(val); \
 445                 break; \
 446         case 0: case 3: default: \
 447                 data->reg[nr] = TEMP_TO_REG(val); \
 448                 break; \
 449         } \
 450         asb100_write_value(client, ASB100_REG_TEMP_##REG(nr+1), \
 451                         data->reg[nr]); \
 452         mutex_unlock(&data->update_lock); \
 453         return count; \
 454 }
 455 
 456 set_temp_reg(MAX, temp_max);
 457 set_temp_reg(HYST, temp_hyst);
 458 
 459 #define sysfs_temp(num) \
 460 static SENSOR_DEVICE_ATTR(temp##num##_input, S_IRUGO, \
 461                 show_temp, NULL, num - 1); \
 462 static SENSOR_DEVICE_ATTR(temp##num##_max, S_IRUGO | S_IWUSR, \
 463                 show_temp_max, set_temp_max, num - 1); \
 464 static SENSOR_DEVICE_ATTR(temp##num##_max_hyst, S_IRUGO | S_IWUSR, \
 465                 show_temp_hyst, set_temp_hyst, num - 1)
 466 
 467 sysfs_temp(1);
 468 sysfs_temp(2);
 469 sysfs_temp(3);
 470 sysfs_temp(4);
 471 
 472 /* VID */
 473 static ssize_t cpu0_vid_show(struct device *dev,
 474                              struct device_attribute *attr, char *buf)
 475 {
 476         struct asb100_data *data = asb100_update_device(dev);
 477         return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));
 478 }
 479 
 480 static DEVICE_ATTR_RO(cpu0_vid);
 481 
 482 /* VRM */
 483 static ssize_t vrm_show(struct device *dev, struct device_attribute *attr,
 484                 char *buf)
 485 {
 486         struct asb100_data *data = dev_get_drvdata(dev);
 487         return sprintf(buf, "%d\n", data->vrm);
 488 }
 489 
 490 static ssize_t vrm_store(struct device *dev, struct device_attribute *attr,
 491                          const char *buf, size_t count)
 492 {
 493         struct asb100_data *data = dev_get_drvdata(dev);
 494         unsigned long val;
 495         int err;
 496 
 497         err = kstrtoul(buf, 10, &val);
 498         if (err)
 499                 return err;
 500 
 501         if (val > 255)
 502                 return -EINVAL;
 503 
 504         data->vrm = val;
 505         return count;
 506 }
 507 
 508 /* Alarms */
 509 static DEVICE_ATTR_RW(vrm);
 510 
 511 static ssize_t alarms_show(struct device *dev, struct device_attribute *attr,
 512                 char *buf)
 513 {
 514         struct asb100_data *data = asb100_update_device(dev);
 515         return sprintf(buf, "%u\n", data->alarms);
 516 }
 517 
 518 static DEVICE_ATTR_RO(alarms);
 519 
 520 static ssize_t show_alarm(struct device *dev, struct device_attribute *attr,
 521                 char *buf)
 522 {
 523         int bitnr = to_sensor_dev_attr(attr)->index;
 524         struct asb100_data *data = asb100_update_device(dev);
 525         return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);
 526 }
 527 static SENSOR_DEVICE_ATTR(in0_alarm, S_IRUGO, show_alarm, NULL, 0);
 528 static SENSOR_DEVICE_ATTR(in1_alarm, S_IRUGO, show_alarm, NULL, 1);
 529 static SENSOR_DEVICE_ATTR(in2_alarm, S_IRUGO, show_alarm, NULL, 2);
 530 static SENSOR_DEVICE_ATTR(in3_alarm, S_IRUGO, show_alarm, NULL, 3);
 531 static SENSOR_DEVICE_ATTR(in4_alarm, S_IRUGO, show_alarm, NULL, 8);
 532 static SENSOR_DEVICE_ATTR(fan1_alarm, S_IRUGO, show_alarm, NULL, 6);
 533 static SENSOR_DEVICE_ATTR(fan2_alarm, S_IRUGO, show_alarm, NULL, 7);
 534 static SENSOR_DEVICE_ATTR(fan3_alarm, S_IRUGO, show_alarm, NULL, 11);
 535 static SENSOR_DEVICE_ATTR(temp1_alarm, S_IRUGO, show_alarm, NULL, 4);
 536 static SENSOR_DEVICE_ATTR(temp2_alarm, S_IRUGO, show_alarm, NULL, 5);
 537 static SENSOR_DEVICE_ATTR(temp3_alarm, S_IRUGO, show_alarm, NULL, 13);
 538 
 539 /* 1 PWM */
 540 static ssize_t pwm1_show(struct device *dev, struct device_attribute *attr,
 541                 char *buf)
 542 {
 543         struct asb100_data *data = asb100_update_device(dev);
 544         return sprintf(buf, "%d\n", ASB100_PWM_FROM_REG(data->pwm & 0x0f));
 545 }
 546 
 547 static ssize_t pwm1_store(struct device *dev, struct device_attribute *attr,
 548                           const char *buf, size_t count)
 549 {
 550         struct i2c_client *client = to_i2c_client(dev);
 551         struct asb100_data *data = i2c_get_clientdata(client);
 552         unsigned long val;
 553         int err;
 554 
 555         err = kstrtoul(buf, 10, &val);
 556         if (err)
 557                 return err;
 558 
 559         mutex_lock(&data->update_lock);
 560         data->pwm &= 0x80; /* keep the enable bit */
 561         data->pwm |= (0x0f & ASB100_PWM_TO_REG(val));
 562         asb100_write_value(client, ASB100_REG_PWM1, data->pwm);
 563         mutex_unlock(&data->update_lock);
 564         return count;
 565 }
 566 
 567 static ssize_t pwm1_enable_show(struct device *dev,
 568                 struct device_attribute *attr, char *buf)
 569 {
 570         struct asb100_data *data = asb100_update_device(dev);
 571         return sprintf(buf, "%d\n", (data->pwm & 0x80) ? 1 : 0);
 572 }
 573 
 574 static ssize_t pwm1_enable_store(struct device *dev,
 575                                  struct device_attribute *attr,
 576                                  const char *buf, size_t count)
 577 {
 578         struct i2c_client *client = to_i2c_client(dev);
 579         struct asb100_data *data = i2c_get_clientdata(client);
 580         unsigned long val;
 581         int err;
 582 
 583         err = kstrtoul(buf, 10, &val);
 584         if (err)
 585                 return err;
 586 
 587         mutex_lock(&data->update_lock);
 588         data->pwm &= 0x0f; /* keep the duty cycle bits */
 589         data->pwm |= (val ? 0x80 : 0x00);
 590         asb100_write_value(client, ASB100_REG_PWM1, data->pwm);
 591         mutex_unlock(&data->update_lock);
 592         return count;
 593 }
 594 
 595 static DEVICE_ATTR_RW(pwm1);
 596 static DEVICE_ATTR_RW(pwm1_enable);
 597 
 598 static struct attribute *asb100_attributes[] = {
 599         &sensor_dev_attr_in0_input.dev_attr.attr,
 600         &sensor_dev_attr_in0_min.dev_attr.attr,
 601         &sensor_dev_attr_in0_max.dev_attr.attr,
 602         &sensor_dev_attr_in1_input.dev_attr.attr,
 603         &sensor_dev_attr_in1_min.dev_attr.attr,
 604         &sensor_dev_attr_in1_max.dev_attr.attr,
 605         &sensor_dev_attr_in2_input.dev_attr.attr,
 606         &sensor_dev_attr_in2_min.dev_attr.attr,
 607         &sensor_dev_attr_in2_max.dev_attr.attr,
 608         &sensor_dev_attr_in3_input.dev_attr.attr,
 609         &sensor_dev_attr_in3_min.dev_attr.attr,
 610         &sensor_dev_attr_in3_max.dev_attr.attr,
 611         &sensor_dev_attr_in4_input.dev_attr.attr,
 612         &sensor_dev_attr_in4_min.dev_attr.attr,
 613         &sensor_dev_attr_in4_max.dev_attr.attr,
 614         &sensor_dev_attr_in5_input.dev_attr.attr,
 615         &sensor_dev_attr_in5_min.dev_attr.attr,
 616         &sensor_dev_attr_in5_max.dev_attr.attr,
 617         &sensor_dev_attr_in6_input.dev_attr.attr,
 618         &sensor_dev_attr_in6_min.dev_attr.attr,
 619         &sensor_dev_attr_in6_max.dev_attr.attr,
 620 
 621         &sensor_dev_attr_fan1_input.dev_attr.attr,
 622         &sensor_dev_attr_fan1_min.dev_attr.attr,
 623         &sensor_dev_attr_fan1_div.dev_attr.attr,
 624         &sensor_dev_attr_fan2_input.dev_attr.attr,
 625         &sensor_dev_attr_fan2_min.dev_attr.attr,
 626         &sensor_dev_attr_fan2_div.dev_attr.attr,
 627         &sensor_dev_attr_fan3_input.dev_attr.attr,
 628         &sensor_dev_attr_fan3_min.dev_attr.attr,
 629         &sensor_dev_attr_fan3_div.dev_attr.attr,
 630 
 631         &sensor_dev_attr_temp1_input.dev_attr.attr,
 632         &sensor_dev_attr_temp1_max.dev_attr.attr,
 633         &sensor_dev_attr_temp1_max_hyst.dev_attr.attr,
 634         &sensor_dev_attr_temp2_input.dev_attr.attr,
 635         &sensor_dev_attr_temp2_max.dev_attr.attr,
 636         &sensor_dev_attr_temp2_max_hyst.dev_attr.attr,
 637         &sensor_dev_attr_temp3_input.dev_attr.attr,
 638         &sensor_dev_attr_temp3_max.dev_attr.attr,
 639         &sensor_dev_attr_temp3_max_hyst.dev_attr.attr,
 640         &sensor_dev_attr_temp4_input.dev_attr.attr,
 641         &sensor_dev_attr_temp4_max.dev_attr.attr,
 642         &sensor_dev_attr_temp4_max_hyst.dev_attr.attr,
 643 
 644         &sensor_dev_attr_in0_alarm.dev_attr.attr,
 645         &sensor_dev_attr_in1_alarm.dev_attr.attr,
 646         &sensor_dev_attr_in2_alarm.dev_attr.attr,
 647         &sensor_dev_attr_in3_alarm.dev_attr.attr,
 648         &sensor_dev_attr_in4_alarm.dev_attr.attr,
 649         &sensor_dev_attr_fan1_alarm.dev_attr.attr,
 650         &sensor_dev_attr_fan2_alarm.dev_attr.attr,
 651         &sensor_dev_attr_fan3_alarm.dev_attr.attr,
 652         &sensor_dev_attr_temp1_alarm.dev_attr.attr,
 653         &sensor_dev_attr_temp2_alarm.dev_attr.attr,
 654         &sensor_dev_attr_temp3_alarm.dev_attr.attr,
 655 
 656         &dev_attr_cpu0_vid.attr,
 657         &dev_attr_vrm.attr,
 658         &dev_attr_alarms.attr,
 659         &dev_attr_pwm1.attr,
 660         &dev_attr_pwm1_enable.attr,
 661 
 662         NULL
 663 };
 664 
 665 static const struct attribute_group asb100_group = {
 666         .attrs = asb100_attributes,
 667 };
 668 
 669 static int asb100_detect_subclients(struct i2c_client *client)
 670 {
 671         int i, id, err;
 672         int address = client->addr;
 673         unsigned short sc_addr[2];
 674         struct asb100_data *data = i2c_get_clientdata(client);
 675         struct i2c_adapter *adapter = client->adapter;
 676 
 677         id = i2c_adapter_id(adapter);
 678 
 679         if (force_subclients[0] == id && force_subclients[1] == address) {
 680                 for (i = 2; i <= 3; i++) {
 681                         if (force_subclients[i] < 0x48 ||
 682                             force_subclients[i] > 0x4f) {
 683                                 dev_err(&client->dev,
 684                                         "invalid subclient address %d; must be 0x48-0x4f\n",
 685                                         force_subclients[i]);
 686                                 err = -ENODEV;
 687                                 goto ERROR_SC_2;
 688                         }
 689                 }
 690                 asb100_write_value(client, ASB100_REG_I2C_SUBADDR,
 691                                         (force_subclients[2] & 0x07) |
 692                                         ((force_subclients[3] & 0x07) << 4));
 693                 sc_addr[0] = force_subclients[2];
 694                 sc_addr[1] = force_subclients[3];
 695         } else {
 696                 int val = asb100_read_value(client, ASB100_REG_I2C_SUBADDR);
 697                 sc_addr[0] = 0x48 + (val & 0x07);
 698                 sc_addr[1] = 0x48 + ((val >> 4) & 0x07);
 699         }
 700 
 701         if (sc_addr[0] == sc_addr[1]) {
 702                 dev_err(&client->dev,
 703                         "duplicate addresses 0x%x for subclients\n",
 704                         sc_addr[0]);
 705                 err = -ENODEV;
 706                 goto ERROR_SC_2;
 707         }
 708 
 709         data->lm75[0] = i2c_new_dummy_device(adapter, sc_addr[0]);
 710         if (IS_ERR(data->lm75[0])) {
 711                 dev_err(&client->dev,
 712                         "subclient %d registration at address 0x%x failed.\n",
 713                         1, sc_addr[0]);
 714                 err = PTR_ERR(data->lm75[0]);
 715                 goto ERROR_SC_2;
 716         }
 717 
 718         data->lm75[1] = i2c_new_dummy_device(adapter, sc_addr[1]);
 719         if (IS_ERR(data->lm75[1])) {
 720                 dev_err(&client->dev,
 721                         "subclient %d registration at address 0x%x failed.\n",
 722                         2, sc_addr[1]);
 723                 err = PTR_ERR(data->lm75[1]);
 724                 goto ERROR_SC_3;
 725         }
 726 
 727         return 0;
 728 
 729 /* Undo inits in case of errors */
 730 ERROR_SC_3:
 731         i2c_unregister_device(data->lm75[0]);
 732 ERROR_SC_2:
 733         return err;
 734 }
 735 
 736 /* Return 0 if detection is successful, -ENODEV otherwise */
 737 static int asb100_detect(struct i2c_client *client,
 738                          struct i2c_board_info *info)
 739 {
 740         struct i2c_adapter *adapter = client->adapter;
 741         int val1, val2;
 742 
 743         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) {
 744                 pr_debug("detect failed, smbus byte data not supported!\n");
 745                 return -ENODEV;
 746         }
 747 
 748         val1 = i2c_smbus_read_byte_data(client, ASB100_REG_BANK);
 749         val2 = i2c_smbus_read_byte_data(client, ASB100_REG_CHIPMAN);
 750 
 751         /* If we're in bank 0 */
 752         if ((!(val1 & 0x07)) &&
 753                         /* Check for ASB100 ID (low byte) */
 754                         (((!(val1 & 0x80)) && (val2 != 0x94)) ||
 755                         /* Check for ASB100 ID (high byte ) */
 756                         ((val1 & 0x80) && (val2 != 0x06)))) {
 757                 pr_debug("detect failed, bad chip id 0x%02x!\n", val2);
 758                 return -ENODEV;
 759         }
 760 
 761         /* Put it now into bank 0 and Vendor ID High Byte */
 762         i2c_smbus_write_byte_data(client, ASB100_REG_BANK,
 763                 (i2c_smbus_read_byte_data(client, ASB100_REG_BANK) & 0x78)
 764                 | 0x80);
 765 
 766         /* Determine the chip type. */
 767         val1 = i2c_smbus_read_byte_data(client, ASB100_REG_WCHIPID);
 768         val2 = i2c_smbus_read_byte_data(client, ASB100_REG_CHIPMAN);
 769 
 770         if (val1 != 0x31 || val2 != 0x06)
 771                 return -ENODEV;
 772 
 773         strlcpy(info->type, "asb100", I2C_NAME_SIZE);
 774 
 775         return 0;
 776 }
 777 
 778 static int asb100_probe(struct i2c_client *client,
 779                         const struct i2c_device_id *id)
 780 {
 781         int err;
 782         struct asb100_data *data;
 783 
 784         data = devm_kzalloc(&client->dev, sizeof(struct asb100_data),
 785                             GFP_KERNEL);
 786         if (!data)
 787                 return -ENOMEM;
 788 
 789         i2c_set_clientdata(client, data);
 790         mutex_init(&data->lock);
 791         mutex_init(&data->update_lock);
 792 
 793         /* Attach secondary lm75 clients */
 794         err = asb100_detect_subclients(client);
 795         if (err)
 796                 return err;
 797 
 798         /* Initialize the chip */
 799         asb100_init_client(client);
 800 
 801         /* A few vars need to be filled upon startup */
 802         data->fan_min[0] = asb100_read_value(client, ASB100_REG_FAN_MIN(0));
 803         data->fan_min[1] = asb100_read_value(client, ASB100_REG_FAN_MIN(1));
 804         data->fan_min[2] = asb100_read_value(client, ASB100_REG_FAN_MIN(2));
 805 
 806         /* Register sysfs hooks */
 807         err = sysfs_create_group(&client->dev.kobj, &asb100_group);
 808         if (err)
 809                 goto ERROR3;
 810 
 811         data->hwmon_dev = hwmon_device_register(&client->dev);
 812         if (IS_ERR(data->hwmon_dev)) {
 813                 err = PTR_ERR(data->hwmon_dev);
 814                 goto ERROR4;
 815         }
 816 
 817         return 0;
 818 
 819 ERROR4:
 820         sysfs_remove_group(&client->dev.kobj, &asb100_group);
 821 ERROR3:
 822         i2c_unregister_device(data->lm75[1]);
 823         i2c_unregister_device(data->lm75[0]);
 824         return err;
 825 }
 826 
 827 static int asb100_remove(struct i2c_client *client)
 828 {
 829         struct asb100_data *data = i2c_get_clientdata(client);
 830 
 831         hwmon_device_unregister(data->hwmon_dev);
 832         sysfs_remove_group(&client->dev.kobj, &asb100_group);
 833 
 834         i2c_unregister_device(data->lm75[1]);
 835         i2c_unregister_device(data->lm75[0]);
 836 
 837         return 0;
 838 }
 839 
 840 /*
 841  * The SMBus locks itself, usually, but nothing may access the chip between
 842  * bank switches.
 843  */
 844 static int asb100_read_value(struct i2c_client *client, u16 reg)
 845 {
 846         struct asb100_data *data = i2c_get_clientdata(client);
 847         struct i2c_client *cl;
 848         int res, bank;
 849 
 850         mutex_lock(&data->lock);
 851 
 852         bank = (reg >> 8) & 0x0f;
 853         if (bank > 2)
 854                 /* switch banks */
 855                 i2c_smbus_write_byte_data(client, ASB100_REG_BANK, bank);
 856 
 857         if (bank == 0 || bank > 2) {
 858                 res = i2c_smbus_read_byte_data(client, reg & 0xff);
 859         } else {
 860                 /* switch to subclient */
 861                 cl = data->lm75[bank - 1];
 862 
 863                 /* convert from ISA to LM75 I2C addresses */
 864                 switch (reg & 0xff) {
 865                 case 0x50: /* TEMP */
 866                         res = i2c_smbus_read_word_swapped(cl, 0);
 867                         break;
 868                 case 0x52: /* CONFIG */
 869                         res = i2c_smbus_read_byte_data(cl, 1);
 870                         break;
 871                 case 0x53: /* HYST */
 872                         res = i2c_smbus_read_word_swapped(cl, 2);
 873                         break;
 874                 case 0x55: /* MAX */
 875                 default:
 876                         res = i2c_smbus_read_word_swapped(cl, 3);
 877                         break;
 878                 }
 879         }
 880 
 881         if (bank > 2)
 882                 i2c_smbus_write_byte_data(client, ASB100_REG_BANK, 0);
 883 
 884         mutex_unlock(&data->lock);
 885 
 886         return res;
 887 }
 888 
 889 static void asb100_write_value(struct i2c_client *client, u16 reg, u16 value)
 890 {
 891         struct asb100_data *data = i2c_get_clientdata(client);
 892         struct i2c_client *cl;
 893         int bank;
 894 
 895         mutex_lock(&data->lock);
 896 
 897         bank = (reg >> 8) & 0x0f;
 898         if (bank > 2)
 899                 /* switch banks */
 900                 i2c_smbus_write_byte_data(client, ASB100_REG_BANK, bank);
 901 
 902         if (bank == 0 || bank > 2) {
 903                 i2c_smbus_write_byte_data(client, reg & 0xff, value & 0xff);
 904         } else {
 905                 /* switch to subclient */
 906                 cl = data->lm75[bank - 1];
 907 
 908                 /* convert from ISA to LM75 I2C addresses */
 909                 switch (reg & 0xff) {
 910                 case 0x52: /* CONFIG */
 911                         i2c_smbus_write_byte_data(cl, 1, value & 0xff);
 912                         break;
 913                 case 0x53: /* HYST */
 914                         i2c_smbus_write_word_swapped(cl, 2, value);
 915                         break;
 916                 case 0x55: /* MAX */
 917                         i2c_smbus_write_word_swapped(cl, 3, value);
 918                         break;
 919                 }
 920         }
 921 
 922         if (bank > 2)
 923                 i2c_smbus_write_byte_data(client, ASB100_REG_BANK, 0);
 924 
 925         mutex_unlock(&data->lock);
 926 }
 927 
 928 static void asb100_init_client(struct i2c_client *client)
 929 {
 930         struct asb100_data *data = i2c_get_clientdata(client);
 931 
 932         data->vrm = vid_which_vrm();
 933 
 934         /* Start monitoring */
 935         asb100_write_value(client, ASB100_REG_CONFIG,
 936                 (asb100_read_value(client, ASB100_REG_CONFIG) & 0xf7) | 0x01);
 937 }
 938 
 939 static struct asb100_data *asb100_update_device(struct device *dev)
 940 {
 941         struct i2c_client *client = to_i2c_client(dev);
 942         struct asb100_data *data = i2c_get_clientdata(client);
 943         int i;
 944 
 945         mutex_lock(&data->update_lock);
 946 
 947         if (time_after(jiffies, data->last_updated + HZ + HZ / 2)
 948                 || !data->valid) {
 949 
 950                 dev_dbg(&client->dev, "starting device update...\n");
 951 
 952                 /* 7 voltage inputs */
 953                 for (i = 0; i < 7; i++) {
 954                         data->in[i] = asb100_read_value(client,
 955                                 ASB100_REG_IN(i));
 956                         data->in_min[i] = asb100_read_value(client,
 957                                 ASB100_REG_IN_MIN(i));
 958                         data->in_max[i] = asb100_read_value(client,
 959                                 ASB100_REG_IN_MAX(i));
 960                 }
 961 
 962                 /* 3 fan inputs */
 963                 for (i = 0; i < 3; i++) {
 964                         data->fan[i] = asb100_read_value(client,
 965                                         ASB100_REG_FAN(i));
 966                         data->fan_min[i] = asb100_read_value(client,
 967                                         ASB100_REG_FAN_MIN(i));
 968                 }
 969 
 970                 /* 4 temperature inputs */
 971                 for (i = 1; i <= 4; i++) {
 972                         data->temp[i-1] = asb100_read_value(client,
 973                                         ASB100_REG_TEMP(i));
 974                         data->temp_max[i-1] = asb100_read_value(client,
 975                                         ASB100_REG_TEMP_MAX(i));
 976                         data->temp_hyst[i-1] = asb100_read_value(client,
 977                                         ASB100_REG_TEMP_HYST(i));
 978                 }
 979 
 980                 /* VID and fan divisors */
 981                 i = asb100_read_value(client, ASB100_REG_VID_FANDIV);
 982                 data->vid = i & 0x0f;
 983                 data->vid |= (asb100_read_value(client,
 984                                 ASB100_REG_CHIPID) & 0x01) << 4;
 985                 data->fan_div[0] = (i >> 4) & 0x03;
 986                 data->fan_div[1] = (i >> 6) & 0x03;
 987                 data->fan_div[2] = (asb100_read_value(client,
 988                                 ASB100_REG_PIN) >> 6) & 0x03;
 989 
 990                 /* PWM */
 991                 data->pwm = asb100_read_value(client, ASB100_REG_PWM1);
 992 
 993                 /* alarms */
 994                 data->alarms = asb100_read_value(client, ASB100_REG_ALARM1) +
 995                         (asb100_read_value(client, ASB100_REG_ALARM2) << 8);
 996 
 997                 data->last_updated = jiffies;
 998                 data->valid = 1;
 999 
1000                 dev_dbg(&client->dev, "... device update complete\n");
1001         }
1002 
1003         mutex_unlock(&data->update_lock);
1004 
1005         return data;
1006 }
1007 
1008 module_i2c_driver(asb100_driver);
1009 
1010 MODULE_AUTHOR("Mark M. Hoffman <mhoffman@lightlink.com>");
1011 MODULE_DESCRIPTION("ASB100 Bach driver");
1012 MODULE_LICENSE("GPL");
/* [<][>][^][v][top][bottom][index][help] */
root/drivers/hwmon/asb100.c

DEFINITIONS
