drivers/hwmon/adm1029.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * adm1029.c - Part of lm_sensors, Linux kernel modules for hardware monitoring
   4  *
   5  * Copyright (C) 2006 Corentin LABBE <clabbe.montjoie@gmail.com>
   6  *
   7  * Based on LM83 Driver by Jean Delvare <jdelvare@suse.de>
   8  *
   9  * Give only processor, motherboard temperatures and fan tachs
  10  * Very rare chip please let me know if you use it
  11  *
  12  * http://www.analog.com/UploadedFiles/Data_Sheets/ADM1029.pdf
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/init.h>
  17 #include <linux/slab.h>
  18 #include <linux/jiffies.h>
  19 #include <linux/i2c.h>
  20 #include <linux/hwmon-sysfs.h>
  21 #include <linux/hwmon.h>
  22 #include <linux/err.h>
  23 #include <linux/mutex.h>
  24
  25 /*
  26  * Addresses to scan
  27  */
  28
  29 static const unsigned short normal_i2c[] = { 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d,
  30                                                 0x2e, 0x2f, I2C_CLIENT_END
  31 };
  32
  33 /*
  34  * The ADM1029 registers
  35  * Manufacturer ID is 0x41 for Analog Devices
  36  */
  37
  38 #define ADM1029_REG_MAN_ID                      0x0D
  39 #define ADM1029_REG_CHIP_ID                     0x0E
  40 #define ADM1029_REG_CONFIG                      0x01
  41 #define ADM1029_REG_NB_FAN_SUPPORT              0x02
  42
  43 #define ADM1029_REG_TEMP_DEVICES_INSTALLED      0x06
  44
  45 #define ADM1029_REG_LOCAL_TEMP                  0xA0
  46 #define ADM1029_REG_REMOTE1_TEMP                0xA1
  47 #define ADM1029_REG_REMOTE2_TEMP                0xA2
  48
  49 #define ADM1029_REG_LOCAL_TEMP_HIGH             0x90
  50 #define ADM1029_REG_REMOTE1_TEMP_HIGH           0x91
  51 #define ADM1029_REG_REMOTE2_TEMP_HIGH           0x92
  52
  53 #define ADM1029_REG_LOCAL_TEMP_LOW              0x98
  54 #define ADM1029_REG_REMOTE1_TEMP_LOW            0x99
  55 #define ADM1029_REG_REMOTE2_TEMP_LOW            0x9A
  56
  57 #define ADM1029_REG_FAN1                        0x70
  58 #define ADM1029_REG_FAN2                        0x71
  59
  60 #define ADM1029_REG_FAN1_MIN                    0x78
  61 #define ADM1029_REG_FAN2_MIN                    0x79
  62
  63 #define ADM1029_REG_FAN1_CONFIG                 0x68
  64 #define ADM1029_REG_FAN2_CONFIG                 0x69
  65
  66 #define TEMP_FROM_REG(val)      ((val) * 1000)
  67
  68 #define DIV_FROM_REG(val)       (1 << (((val) >> 6) - 1))
  69
  70 /* Registers to be checked by adm1029_update_device() */
  71 static const u8 ADM1029_REG_TEMP[] = {
  72         ADM1029_REG_LOCAL_TEMP,
  73         ADM1029_REG_REMOTE1_TEMP,
  74         ADM1029_REG_REMOTE2_TEMP,
  75         ADM1029_REG_LOCAL_TEMP_HIGH,
  76         ADM1029_REG_REMOTE1_TEMP_HIGH,
  77         ADM1029_REG_REMOTE2_TEMP_HIGH,
  78         ADM1029_REG_LOCAL_TEMP_LOW,
  79         ADM1029_REG_REMOTE1_TEMP_LOW,
  80         ADM1029_REG_REMOTE2_TEMP_LOW,
  81 };
  82
  83 static const u8 ADM1029_REG_FAN[] = {
  84         ADM1029_REG_FAN1,
  85         ADM1029_REG_FAN2,
  86         ADM1029_REG_FAN1_MIN,
  87         ADM1029_REG_FAN2_MIN,
  88 };
  89
  90 static const u8 ADM1029_REG_FAN_DIV[] = {
  91         ADM1029_REG_FAN1_CONFIG,
  92         ADM1029_REG_FAN2_CONFIG,
  93 };
  94
  95 /*
  96  * Client data (each client gets its own)
  97  */
  98
  99 struct adm1029_data {
 100         struct i2c_client *client;
 101         struct mutex update_lock; /* protect register access */
 102         char valid;             /* zero until following fields are valid */
 103         unsigned long last_updated;     /* in jiffies */
 104
 105         /* registers values, signed for temperature, unsigned for other stuff */
 106         s8 temp[ARRAY_SIZE(ADM1029_REG_TEMP)];
 107         u8 fan[ARRAY_SIZE(ADM1029_REG_FAN)];
 108         u8 fan_div[ARRAY_SIZE(ADM1029_REG_FAN_DIV)];
 109 };
 110
 111 /*
 112  * function that update the status of the chips (temperature for example)
 113  */
 114 static struct adm1029_data *adm1029_update_device(struct device *dev)
 115 {
 116         struct adm1029_data *data = dev_get_drvdata(dev);
 117         struct i2c_client *client = data->client;
 118
 119         mutex_lock(&data->update_lock);
 120         /*
 121          * Use the "cache" Luke, don't recheck values
 122          * if there are already checked not a long time later
 123          */
 124         if (time_after(jiffies, data->last_updated + HZ * 2) || !data->valid) {
 125                 int nr;
 126
 127                 dev_dbg(&client->dev, "Updating adm1029 data\n");
 128
 129                 for (nr = 0; nr < ARRAY_SIZE(ADM1029_REG_TEMP); nr++) {
 130                         data->temp[nr] =
 131                             i2c_smbus_read_byte_data(client,
 132                                                      ADM1029_REG_TEMP[nr]);
 133                 }
 134                 for (nr = 0; nr < ARRAY_SIZE(ADM1029_REG_FAN); nr++) {
 135                         data->fan[nr] =
 136                             i2c_smbus_read_byte_data(client,
 137                                                      ADM1029_REG_FAN[nr]);
 138                 }
 139                 for (nr = 0; nr < ARRAY_SIZE(ADM1029_REG_FAN_DIV); nr++) {
 140                         data->fan_div[nr] =
 141                             i2c_smbus_read_byte_data(client,
 142                                                      ADM1029_REG_FAN_DIV[nr]);
 143                 }
 144
 145                 data->last_updated = jiffies;
 146                 data->valid = 1;
 147         }
 148
 149         mutex_unlock(&data->update_lock);
 150
 151         return data;
 152 }
 153
 154 /*
 155  * Sysfs stuff
 156  */
 157
 158 static ssize_t
 159 temp_show(struct device *dev, struct device_attribute *devattr, char *buf)
 160 {
 161         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 162         struct adm1029_data *data = adm1029_update_device(dev);
 163
 164         return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[attr->index]));
 165 }
 166
 167 static ssize_t
 168 fan_show(struct device *dev, struct device_attribute *devattr, char *buf)
 169 {
 170         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 171         struct adm1029_data *data = adm1029_update_device(dev);
 172         u16 val;
 173
 174         if (data->fan[attr->index] == 0 ||
 175             (data->fan_div[attr->index] & 0xC0) == 0 ||
 176             data->fan[attr->index] == 255) {
 177                 return sprintf(buf, "0\n");
 178         }
 179
 180         val = 1880 * 120 / DIV_FROM_REG(data->fan_div[attr->index])
 181             / data->fan[attr->index];
 182         return sprintf(buf, "%d\n", val);
 183 }
 184
 185 static ssize_t
 186 fan_div_show(struct device *dev, struct device_attribute *devattr, char *buf)
 187 {
 188         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 189         struct adm1029_data *data = adm1029_update_device(dev);
 190
 191         if ((data->fan_div[attr->index] & 0xC0) == 0)
 192                 return sprintf(buf, "0\n");
 193         return sprintf(buf, "%d\n", DIV_FROM_REG(data->fan_div[attr->index]));
 194 }
 195
 196 static ssize_t fan_div_store(struct device *dev,
 197                              struct device_attribute *devattr,
 198                              const char *buf, size_t count)
 199 {
 200         struct adm1029_data *data = dev_get_drvdata(dev);
 201         struct i2c_client *client = data->client;
 202         struct sensor_device_attribute *attr = to_sensor_dev_attr(devattr);
 203         u8 reg;
 204         long val;
 205         int ret = kstrtol(buf, 10, &val);
 206
 207         if (ret < 0)
 208                 return ret;
 209
 210         mutex_lock(&data->update_lock);
 211
 212         /*Read actual config */
 213         reg = i2c_smbus_read_byte_data(client,
 214                                        ADM1029_REG_FAN_DIV[attr->index]);
 215
 216         switch (val) {
 217         case 1:
 218                 val = 1;
 219                 break;
 220         case 2:
 221                 val = 2;
 222                 break;
 223         case 4:
 224                 val = 3;
 225                 break;
 226         default:
 227                 mutex_unlock(&data->update_lock);
 228                 dev_err(&client->dev,
 229                         "fan_div value %ld not supported. Choose one of 1, 2 or 4!\n",
 230                         val);
 231                 return -EINVAL;
 232         }
 233         /* Update the value */
 234         reg = (reg & 0x3F) | (val << 6);
 235
 236         /* Update the cache */
 237         data->fan_div[attr->index] = reg;
 238
 239         /* Write value */
 240         i2c_smbus_write_byte_data(client,
 241                                   ADM1029_REG_FAN_DIV[attr->index], reg);
 242         mutex_unlock(&data->update_lock);
 243
 244         return count;
 245 }
 246
 247 /* Access rights on sysfs. */
 248 static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, 0);
 249 static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, 1);
 250 static SENSOR_DEVICE_ATTR_RO(temp3_input, temp, 2);
 251
 252 static SENSOR_DEVICE_ATTR_RO(temp1_max, temp, 3);
 253 static SENSOR_DEVICE_ATTR_RO(temp2_max, temp, 4);
 254 static SENSOR_DEVICE_ATTR_RO(temp3_max, temp, 5);
 255
 256 static SENSOR_DEVICE_ATTR_RO(temp1_min, temp, 6);
 257 static SENSOR_DEVICE_ATTR_RO(temp2_min, temp, 7);
 258 static SENSOR_DEVICE_ATTR_RO(temp3_min, temp, 8);
 259
 260 static SENSOR_DEVICE_ATTR_RO(fan1_input, fan, 0);
 261 static SENSOR_DEVICE_ATTR_RO(fan2_input, fan, 1);
 262
 263 static SENSOR_DEVICE_ATTR_RO(fan1_min, fan, 2);
 264 static SENSOR_DEVICE_ATTR_RO(fan2_min, fan, 3);
 265
 266 static SENSOR_DEVICE_ATTR_RW(fan1_div, fan_div, 0);
 267 static SENSOR_DEVICE_ATTR_RW(fan2_div, fan_div, 1);
 268
 269 static struct attribute *adm1029_attrs[] = {
 270         &sensor_dev_attr_temp1_input.dev_attr.attr,
 271         &sensor_dev_attr_temp1_min.dev_attr.attr,
 272         &sensor_dev_attr_temp1_max.dev_attr.attr,
 273         &sensor_dev_attr_temp2_input.dev_attr.attr,
 274         &sensor_dev_attr_temp2_min.dev_attr.attr,
 275         &sensor_dev_attr_temp2_max.dev_attr.attr,
 276         &sensor_dev_attr_temp3_input.dev_attr.attr,
 277         &sensor_dev_attr_temp3_min.dev_attr.attr,
 278         &sensor_dev_attr_temp3_max.dev_attr.attr,
 279         &sensor_dev_attr_fan1_input.dev_attr.attr,
 280         &sensor_dev_attr_fan2_input.dev_attr.attr,
 281         &sensor_dev_attr_fan1_min.dev_attr.attr,
 282         &sensor_dev_attr_fan2_min.dev_attr.attr,
 283         &sensor_dev_attr_fan1_div.dev_attr.attr,
 284         &sensor_dev_attr_fan2_div.dev_attr.attr,
 285         NULL
 286 };
 287
 288 ATTRIBUTE_GROUPS(adm1029);
 289
 290 /*
 291  * Real code
 292  */
 293
 294 /* Return 0 if detection is successful, -ENODEV otherwise */
 295 static int adm1029_detect(struct i2c_client *client,
 296                           struct i2c_board_info *info)
 297 {
 298         struct i2c_adapter *adapter = client->adapter;
 299         u8 man_id, chip_id, temp_devices_installed, nb_fan_support;
 300
 301         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))
 302                 return -ENODEV;
 303
 304         /*
 305          * ADM1029 doesn't have CHIP ID, check just MAN ID
 306          * For better detection we check also ADM1029_TEMP_DEVICES_INSTALLED,
 307          * ADM1029_REG_NB_FAN_SUPPORT and compare it with possible values
 308          * documented
 309          */
 310
 311         man_id = i2c_smbus_read_byte_data(client, ADM1029_REG_MAN_ID);
 312         chip_id = i2c_smbus_read_byte_data(client, ADM1029_REG_CHIP_ID);
 313         temp_devices_installed = i2c_smbus_read_byte_data(client,
 314                                         ADM1029_REG_TEMP_DEVICES_INSTALLED);
 315         nb_fan_support = i2c_smbus_read_byte_data(client,
 316                                                   ADM1029_REG_NB_FAN_SUPPORT);
 317         /* 0x41 is Analog Devices */
 318         if (man_id != 0x41 || (temp_devices_installed & 0xf9) != 0x01 ||
 319             nb_fan_support != 0x03)
 320                 return -ENODEV;
 321
 322         if ((chip_id & 0xF0) != 0x00) {
 323                 /*
 324                  * There are no "official" CHIP ID, so actually
 325                  * we use Major/Minor revision for that
 326                  */
 327                 pr_info("Unknown major revision %x, please let us know\n",
 328                         chip_id);
 329                 return -ENODEV;
 330         }
 331
 332         strlcpy(info->type, "adm1029", I2C_NAME_SIZE);
 333
 334         return 0;
 335 }
 336
 337 static int adm1029_init_client(struct i2c_client *client)
 338 {
 339         u8 config;
 340
 341         config = i2c_smbus_read_byte_data(client, ADM1029_REG_CONFIG);
 342         if ((config & 0x10) == 0) {
 343                 i2c_smbus_write_byte_data(client, ADM1029_REG_CONFIG,
 344                                           config | 0x10);
 345         }
 346         /* recheck config */
 347         config = i2c_smbus_read_byte_data(client, ADM1029_REG_CONFIG);
 348         if ((config & 0x10) == 0) {
 349                 dev_err(&client->dev, "Initialization failed!\n");
 350                 return 0;
 351         }
 352         return 1;
 353 }
 354
 355 static int adm1029_probe(struct i2c_client *client)
 356 {
 357         struct device *dev = &client->dev;
 358         struct adm1029_data *data;
 359         struct device *hwmon_dev;
 360
 361         data = devm_kzalloc(dev, sizeof(struct adm1029_data), GFP_KERNEL);
 362         if (!data)
 363                 return -ENOMEM;
 364
 365         data->client = client;
 366         mutex_init(&data->update_lock);
 367
 368         /*
 369          * Initialize the ADM1029 chip
 370          * Check config register
 371          */
 372         if (adm1029_init_client(client) == 0)
 373                 return -ENODEV;
 374
 375         hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,
 376                                                            data,
 377                                                            adm1029_groups);
 378         return PTR_ERR_OR_ZERO(hwmon_dev);
 379 }
 380
 381 static const struct i2c_device_id adm1029_id[] = {
 382         { "adm1029", 0 },
 383         { }
 384 };
 385 MODULE_DEVICE_TABLE(i2c, adm1029_id);
 386
 387 static struct i2c_driver adm1029_driver = {
 388         .class          = I2C_CLASS_HWMON,
 389         .driver = {
 390                 .name = "adm1029",
 391         },
 392         .probe_new      = adm1029_probe,
 393         .id_table       = adm1029_id,
 394         .detect         = adm1029_detect,
 395         .address_list   = normal_i2c,
 396 };
 397
 398 module_i2c_driver(adm1029_driver);
 399
 400 MODULE_AUTHOR("Corentin LABBE <clabbe.montjoie@gmail.com>");
 401 MODULE_DESCRIPTION("adm1029 driver");
 402 MODULE_LICENSE("GPL v2");