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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 | // SPDX-License-Identifier: GPL-2.0-or-later /* * emc6w201.c - Hardware monitoring driver for the SMSC EMC6W201 * Copyright (C) 2011 Jean Delvare <jdelvare@suse.de> */ #include <linux/module.h> #include <linux/init.h> #include <linux/slab.h> #include <linux/jiffies.h> #include <linux/i2c.h> #include <linux/hwmon.h> #include <linux/hwmon-sysfs.h> #include <linux/err.h> #include <linux/mutex.h> /* * Addresses to scan */ static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END }; /* * The EMC6W201 registers */ #define EMC6W201_REG_IN(nr) (0x20 + (nr)) #define EMC6W201_REG_TEMP(nr) (0x26 + (nr)) #define EMC6W201_REG_FAN(nr) (0x2C + (nr) * 2) #define EMC6W201_REG_COMPANY 0x3E #define EMC6W201_REG_VERSTEP 0x3F #define EMC6W201_REG_CONFIG 0x40 #define EMC6W201_REG_IN_LOW(nr) (0x4A + (nr) * 2) #define EMC6W201_REG_IN_HIGH(nr) (0x4B + (nr) * 2) #define EMC6W201_REG_TEMP_LOW(nr) (0x56 + (nr) * 2) #define EMC6W201_REG_TEMP_HIGH(nr) (0x57 + (nr) * 2) #define EMC6W201_REG_FAN_MIN(nr) (0x62 + (nr) * 2) enum subfeature { input, min, max }; /* * Per-device data */ struct emc6w201_data { struct i2c_client *client; struct mutex update_lock; bool valid; /* false until following fields are valid */ unsigned long last_updated; /* in jiffies */ /* registers values */ u8 in[3][6]; s8 temp[3][6]; u16 fan[2][5]; }; /* * Combine LSB and MSB registers in a single value * Locking: must be called with data->update_lock held */ static u16 emc6w201_read16(struct i2c_client *client, u8 reg) { int lsb, msb; lsb = i2c_smbus_read_byte_data(client, reg); msb = i2c_smbus_read_byte_data(client, reg + 1); if (unlikely(lsb < 0 || msb < 0)) { dev_err(&client->dev, "%d-bit %s failed at 0x%02x\n", 16, "read", reg); return 0xFFFF; /* Arbitrary value */ } return (msb << 8) | lsb; } /* * Write 16-bit value to LSB and MSB registers * Locking: must be called with data->update_lock held */ static int emc6w201_write16(struct i2c_client *client, u8 reg, u16 val) { int err; err = i2c_smbus_write_byte_data(client, reg, val & 0xff); if (likely(!err)) err = i2c_smbus_write_byte_data(client, reg + 1, val >> 8); if (unlikely(err < 0)) dev_err(&client->dev, "%d-bit %s failed at 0x%02x\n", 16, "write", reg); return err; } /* Read 8-bit value from register */ static u8 emc6w201_read8(struct i2c_client *client, u8 reg) { int val; val = i2c_smbus_read_byte_data(client, reg); if (unlikely(val < 0)) { dev_err(&client->dev, "%d-bit %s failed at 0x%02x\n", 8, "read", reg); return 0x00; /* Arbitrary value */ } return val; } /* Write 8-bit value to register */ static int emc6w201_write8(struct i2c_client *client, u8 reg, u8 val) { int err; err = i2c_smbus_write_byte_data(client, reg, val); if (unlikely(err < 0)) dev_err(&client->dev, "%d-bit %s failed at 0x%02x\n", 8, "write", reg); return err; } static struct emc6w201_data *emc6w201_update_device(struct device *dev) { struct emc6w201_data *data = dev_get_drvdata(dev); struct i2c_client *client = data->client; int nr; mutex_lock(&data->update_lock); if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { for (nr = 0; nr < 6; nr++) { data->in[input][nr] = emc6w201_read8(client, EMC6W201_REG_IN(nr)); data->in[min][nr] = emc6w201_read8(client, EMC6W201_REG_IN_LOW(nr)); data->in[max][nr] = emc6w201_read8(client, EMC6W201_REG_IN_HIGH(nr)); } for (nr = 0; nr < 6; nr++) { data->temp[input][nr] = emc6w201_read8(client, EMC6W201_REG_TEMP(nr)); data->temp[min][nr] = emc6w201_read8(client, EMC6W201_REG_TEMP_LOW(nr)); data->temp[max][nr] = emc6w201_read8(client, EMC6W201_REG_TEMP_HIGH(nr)); } for (nr = 0; nr < 5; nr++) { data->fan[input][nr] = emc6w201_read16(client, EMC6W201_REG_FAN(nr)); data->fan[min][nr] = emc6w201_read16(client, EMC6W201_REG_FAN_MIN(nr)); } data->last_updated = jiffies; data->valid = true; } mutex_unlock(&data->update_lock); return data; } /* * Sysfs callback functions */ static const s16 nominal_mv[6] = { 2500, 1500, 3300, 5000, 1500, 1500 }; static ssize_t in_show(struct device *dev, struct device_attribute *devattr, char *buf) { struct emc6w201_data *data = emc6w201_update_device(dev); int sf = to_sensor_dev_attr_2(devattr)->index; int nr = to_sensor_dev_attr_2(devattr)->nr; return sprintf(buf, "%u\n", (unsigned)data->in[sf][nr] * nominal_mv[nr] / 0xC0); } static ssize_t in_store(struct device *dev, struct device_attribute *devattr, const char *buf, size_t count) { struct emc6w201_data *data = dev_get_drvdata(dev); struct i2c_client *client = data->client; int sf = to_sensor_dev_attr_2(devattr)->index; int nr = to_sensor_dev_attr_2(devattr)->nr; int err; long val; u8 reg; err = kstrtol(buf, 10, &val); if (err < 0) return err; val = clamp_val(val, 0, 255 * nominal_mv[nr] / 192); val = DIV_ROUND_CLOSEST(val * 192, nominal_mv[nr]); reg = (sf == min) ? EMC6W201_REG_IN_LOW(nr) : EMC6W201_REG_IN_HIGH(nr); mutex_lock(&data->update_lock); data->in[sf][nr] = val; err = emc6w201_write8(client, reg, data->in[sf][nr]); mutex_unlock(&data->update_lock); return err < 0 ? err : count; } static ssize_t temp_show(struct device *dev, struct device_attribute *devattr, char *buf) { struct emc6w201_data *data = emc6w201_update_device(dev); int sf = to_sensor_dev_attr_2(devattr)->index; int nr = to_sensor_dev_attr_2(devattr)->nr; return sprintf(buf, "%d\n", (int)data->temp[sf][nr] * 1000); } static ssize_t temp_store(struct device *dev, struct device_attribute *devattr, const char *buf, size_t count) { struct emc6w201_data *data = dev_get_drvdata(dev); struct i2c_client *client = data->client; int sf = to_sensor_dev_attr_2(devattr)->index; int nr = to_sensor_dev_attr_2(devattr)->nr; int err; long val; u8 reg; err = kstrtol(buf, 10, &val); if (err < 0) return err; val = clamp_val(val, -127000, 127000); val = DIV_ROUND_CLOSEST(val, 1000); reg = (sf == min) ? EMC6W201_REG_TEMP_LOW(nr) : EMC6W201_REG_TEMP_HIGH(nr); mutex_lock(&data->update_lock); data->temp[sf][nr] = val; err = emc6w201_write8(client, reg, data->temp[sf][nr]); mutex_unlock(&data->update_lock); return err < 0 ? err : count; } static ssize_t fan_show(struct device *dev, struct device_attribute *devattr, char *buf) { struct emc6w201_data *data = emc6w201_update_device(dev); int sf = to_sensor_dev_attr_2(devattr)->index; int nr = to_sensor_dev_attr_2(devattr)->nr; unsigned rpm; if (data->fan[sf][nr] == 0 || data->fan[sf][nr] == 0xFFFF) rpm = 0; else rpm = 5400000U / data->fan[sf][nr]; return sprintf(buf, "%u\n", rpm); } static ssize_t fan_store(struct device *dev, struct device_attribute *devattr, const char *buf, size_t count) { struct emc6w201_data *data = dev_get_drvdata(dev); struct i2c_client *client = data->client; int sf = to_sensor_dev_attr_2(devattr)->index; int nr = to_sensor_dev_attr_2(devattr)->nr; int err; unsigned long val; err = kstrtoul(buf, 10, &val); if (err < 0) return err; if (val == 0) { val = 0xFFFF; } else { val = DIV_ROUND_CLOSEST(5400000U, val); val = clamp_val(val, 0, 0xFFFE); } mutex_lock(&data->update_lock); data->fan[sf][nr] = val; err = emc6w201_write16(client, EMC6W201_REG_FAN_MIN(nr), data->fan[sf][nr]); mutex_unlock(&data->update_lock); return err < 0 ? err : count; } static SENSOR_DEVICE_ATTR_2_RO(in0_input, in, 0, input); static SENSOR_DEVICE_ATTR_2_RW(in0_min, in, 0, min); static SENSOR_DEVICE_ATTR_2_RW(in0_max, in, 0, max); static SENSOR_DEVICE_ATTR_2_RO(in1_input, in, 1, input); static SENSOR_DEVICE_ATTR_2_RW(in1_min, in, 1, min); static SENSOR_DEVICE_ATTR_2_RW(in1_max, in, 1, max); static SENSOR_DEVICE_ATTR_2_RO(in2_input, in, 2, input); static SENSOR_DEVICE_ATTR_2_RW(in2_min, in, 2, min); static SENSOR_DEVICE_ATTR_2_RW(in2_max, in, 2, max); static SENSOR_DEVICE_ATTR_2_RO(in3_input, in, 3, input); static SENSOR_DEVICE_ATTR_2_RW(in3_min, in, 3, min); static SENSOR_DEVICE_ATTR_2_RW(in3_max, in, 3, max); static SENSOR_DEVICE_ATTR_2_RO(in4_input, in, 4, input); static SENSOR_DEVICE_ATTR_2_RW(in4_min, in, 4, min); static SENSOR_DEVICE_ATTR_2_RW(in4_max, in, 4, max); static SENSOR_DEVICE_ATTR_2_RO(in5_input, in, 5, input); static SENSOR_DEVICE_ATTR_2_RW(in5_min, in, 5, min); static SENSOR_DEVICE_ATTR_2_RW(in5_max, in, 5, max); static SENSOR_DEVICE_ATTR_2_RO(temp1_input, temp, 0, input); static SENSOR_DEVICE_ATTR_2_RW(temp1_min, temp, 0, min); static SENSOR_DEVICE_ATTR_2_RW(temp1_max, temp, 0, max); static SENSOR_DEVICE_ATTR_2_RO(temp2_input, temp, 1, input); static SENSOR_DEVICE_ATTR_2_RW(temp2_min, temp, 1, min); static SENSOR_DEVICE_ATTR_2_RW(temp2_max, temp, 1, max); static SENSOR_DEVICE_ATTR_2_RO(temp3_input, temp, 2, input); static SENSOR_DEVICE_ATTR_2_RW(temp3_min, temp, 2, min); static SENSOR_DEVICE_ATTR_2_RW(temp3_max, temp, 2, max); static SENSOR_DEVICE_ATTR_2_RO(temp4_input, temp, 3, input); static SENSOR_DEVICE_ATTR_2_RW(temp4_min, temp, 3, min); static SENSOR_DEVICE_ATTR_2_RW(temp4_max, temp, 3, max); static SENSOR_DEVICE_ATTR_2_RO(temp5_input, temp, 4, input); static SENSOR_DEVICE_ATTR_2_RW(temp5_min, temp, 4, min); static SENSOR_DEVICE_ATTR_2_RW(temp5_max, temp, 4, max); static SENSOR_DEVICE_ATTR_2_RO(temp6_input, temp, 5, input); static SENSOR_DEVICE_ATTR_2_RW(temp6_min, temp, 5, min); static SENSOR_DEVICE_ATTR_2_RW(temp6_max, temp, 5, max); static SENSOR_DEVICE_ATTR_2_RO(fan1_input, fan, 0, input); static SENSOR_DEVICE_ATTR_2_RW(fan1_min, fan, 0, min); static SENSOR_DEVICE_ATTR_2_RO(fan2_input, fan, 1, input); static SENSOR_DEVICE_ATTR_2_RW(fan2_min, fan, 1, min); static SENSOR_DEVICE_ATTR_2_RO(fan3_input, fan, 2, input); static SENSOR_DEVICE_ATTR_2_RW(fan3_min, fan, 2, min); static SENSOR_DEVICE_ATTR_2_RO(fan4_input, fan, 3, input); static SENSOR_DEVICE_ATTR_2_RW(fan4_min, fan, 3, min); static SENSOR_DEVICE_ATTR_2_RO(fan5_input, fan, 4, input); static SENSOR_DEVICE_ATTR_2_RW(fan5_min, fan, 4, min); static struct attribute *emc6w201_attrs[] = { &sensor_dev_attr_in0_input.dev_attr.attr, &sensor_dev_attr_in0_min.dev_attr.attr, &sensor_dev_attr_in0_max.dev_attr.attr, &sensor_dev_attr_in1_input.dev_attr.attr, &sensor_dev_attr_in1_min.dev_attr.attr, &sensor_dev_attr_in1_max.dev_attr.attr, &sensor_dev_attr_in2_input.dev_attr.attr, &sensor_dev_attr_in2_min.dev_attr.attr, &sensor_dev_attr_in2_max.dev_attr.attr, &sensor_dev_attr_in3_input.dev_attr.attr, &sensor_dev_attr_in3_min.dev_attr.attr, &sensor_dev_attr_in3_max.dev_attr.attr, &sensor_dev_attr_in4_input.dev_attr.attr, &sensor_dev_attr_in4_min.dev_attr.attr, &sensor_dev_attr_in4_max.dev_attr.attr, &sensor_dev_attr_in5_input.dev_attr.attr, &sensor_dev_attr_in5_min.dev_attr.attr, &sensor_dev_attr_in5_max.dev_attr.attr, &sensor_dev_attr_temp1_input.dev_attr.attr, &sensor_dev_attr_temp1_min.dev_attr.attr, &sensor_dev_attr_temp1_max.dev_attr.attr, &sensor_dev_attr_temp2_input.dev_attr.attr, &sensor_dev_attr_temp2_min.dev_attr.attr, &sensor_dev_attr_temp2_max.dev_attr.attr, &sensor_dev_attr_temp3_input.dev_attr.attr, &sensor_dev_attr_temp3_min.dev_attr.attr, &sensor_dev_attr_temp3_max.dev_attr.attr, &sensor_dev_attr_temp4_input.dev_attr.attr, &sensor_dev_attr_temp4_min.dev_attr.attr, &sensor_dev_attr_temp4_max.dev_attr.attr, &sensor_dev_attr_temp5_input.dev_attr.attr, &sensor_dev_attr_temp5_min.dev_attr.attr, &sensor_dev_attr_temp5_max.dev_attr.attr, &sensor_dev_attr_temp6_input.dev_attr.attr, &sensor_dev_attr_temp6_min.dev_attr.attr, &sensor_dev_attr_temp6_max.dev_attr.attr, &sensor_dev_attr_fan1_input.dev_attr.attr, &sensor_dev_attr_fan1_min.dev_attr.attr, &sensor_dev_attr_fan2_input.dev_attr.attr, &sensor_dev_attr_fan2_min.dev_attr.attr, &sensor_dev_attr_fan3_input.dev_attr.attr, &sensor_dev_attr_fan3_min.dev_attr.attr, &sensor_dev_attr_fan4_input.dev_attr.attr, &sensor_dev_attr_fan4_min.dev_attr.attr, &sensor_dev_attr_fan5_input.dev_attr.attr, &sensor_dev_attr_fan5_min.dev_attr.attr, NULL }; ATTRIBUTE_GROUPS(emc6w201); /* * Driver interface */ /* Return 0 if detection is successful, -ENODEV otherwise */ static int emc6w201_detect(struct i2c_client *client, struct i2c_board_info *info) { struct i2c_adapter *adapter = client->adapter; int company, verstep, config; if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) return -ENODEV; /* Identification */ company = i2c_smbus_read_byte_data(client, EMC6W201_REG_COMPANY); if (company != 0x5C) return -ENODEV; verstep = i2c_smbus_read_byte_data(client, EMC6W201_REG_VERSTEP); if (verstep < 0 || (verstep & 0xF0) != 0xB0) return -ENODEV; if ((verstep & 0x0F) > 2) { dev_dbg(&client->dev, "Unknown EMC6W201 stepping %d\n", verstep & 0x0F); return -ENODEV; } /* Check configuration */ config = i2c_smbus_read_byte_data(client, EMC6W201_REG_CONFIG); if (config < 0 || (config & 0xF4) != 0x04) return -ENODEV; if (!(config & 0x01)) { dev_err(&client->dev, "Monitoring not enabled\n"); return -ENODEV; } strscpy(info->type, "emc6w201", I2C_NAME_SIZE); return 0; } static int emc6w201_probe(struct i2c_client *client) { struct device *dev = &client->dev; struct emc6w201_data *data; struct device *hwmon_dev; data = devm_kzalloc(dev, sizeof(struct emc6w201_data), GFP_KERNEL); if (!data) return -ENOMEM; data->client = client; mutex_init(&data->update_lock); hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, data, emc6w201_groups); return PTR_ERR_OR_ZERO(hwmon_dev); } static const struct i2c_device_id emc6w201_id[] = { { "emc6w201", 0 }, { } }; MODULE_DEVICE_TABLE(i2c, emc6w201_id); static struct i2c_driver emc6w201_driver = { .class = I2C_CLASS_HWMON, .driver = { .name = "emc6w201", }, .probe_new = emc6w201_probe, .id_table = emc6w201_id, .detect = emc6w201_detect, .address_list = normal_i2c, }; module_i2c_driver(emc6w201_driver); MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>"); MODULE_DESCRIPTION("SMSC EMC6W201 hardware monitoring driver"); MODULE_LICENSE("GPL"); |