1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * emc6w201.c - Hardware monitoring driver for the SMSC EMC6W201 4 * Copyright (C) 2011 Jean Delvare <jdelvare@suse.de> 5 */ 6 7#include <linux/module.h> 8#include <linux/init.h> 9#include <linux/slab.h> 10#include <linux/jiffies.h> 11#include <linux/i2c.h> 12#include <linux/hwmon.h> 13#include <linux/hwmon-sysfs.h> 14#include <linux/err.h> 15#include <linux/mutex.h> 16 17/* 18 * Addresses to scan 19 */ 20 21static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END }; 22 23/* 24 * The EMC6W201 registers 25 */ 26 27#define EMC6W201_REG_IN(nr) (0x20 + (nr)) 28#define EMC6W201_REG_TEMP(nr) (0x26 + (nr)) 29#define EMC6W201_REG_FAN(nr) (0x2C + (nr) * 2) 30#define EMC6W201_REG_COMPANY 0x3E 31#define EMC6W201_REG_VERSTEP 0x3F 32#define EMC6W201_REG_CONFIG 0x40 33#define EMC6W201_REG_IN_LOW(nr) (0x4A + (nr) * 2) 34#define EMC6W201_REG_IN_HIGH(nr) (0x4B + (nr) * 2) 35#define EMC6W201_REG_TEMP_LOW(nr) (0x56 + (nr) * 2) 36#define EMC6W201_REG_TEMP_HIGH(nr) (0x57 + (nr) * 2) 37#define EMC6W201_REG_FAN_MIN(nr) (0x62 + (nr) * 2) 38 39enum subfeature { input, min, max }; 40 41/* 42 * Per-device data 43 */ 44 45struct emc6w201_data { 46 struct i2c_client *client; 47 struct mutex update_lock; 48 bool valid; /* false until following fields are valid */ 49 unsigned long last_updated; /* in jiffies */ 50 51 /* registers values */ 52 u8 in[3][6]; 53 s8 temp[3][6]; 54 u16 fan[2][5]; 55}; 56 57/* 58 * Combine LSB and MSB registers in a single value 59 * Locking: must be called with data->update_lock held 60 */ 61static u16 emc6w201_read16(struct i2c_client *client, u8 reg) 62{ 63 int lsb, msb; 64 65 lsb = i2c_smbus_read_byte_data(client, reg); 66 msb = i2c_smbus_read_byte_data(client, reg + 1); 67 if (unlikely(lsb < 0 || msb < 0)) { 68 dev_err(&client->dev, "%d-bit %s failed at 0x%02x\n", 69 16, "read", reg); 70 return 0xFFFF; /* Arbitrary value */ 71 } 72 73 return (msb << 8) | lsb; 74} 75 76/* 77 * Write 16-bit value to LSB and MSB registers 78 * Locking: must be called with data->update_lock held 79 */ 80static int emc6w201_write16(struct i2c_client *client, u8 reg, u16 val) 81{ 82 int err; 83 84 err = i2c_smbus_write_byte_data(client, reg, val & 0xff); 85 if (likely(!err)) 86 err = i2c_smbus_write_byte_data(client, reg + 1, val >> 8); 87 if (unlikely(err < 0)) 88 dev_err(&client->dev, "%d-bit %s failed at 0x%02x\n", 89 16, "write", reg); 90 91 return err; 92} 93 94/* Read 8-bit value from register */ 95static u8 emc6w201_read8(struct i2c_client *client, u8 reg) 96{ 97 int val; 98 99 val = i2c_smbus_read_byte_data(client, reg); 100 if (unlikely(val < 0)) { 101 dev_err(&client->dev, "%d-bit %s failed at 0x%02x\n", 102 8, "read", reg); 103 return 0x00; /* Arbitrary value */ 104 } 105 106 return val; 107} 108 109/* Write 8-bit value to register */ 110static int emc6w201_write8(struct i2c_client *client, u8 reg, u8 val) 111{ 112 int err; 113 114 err = i2c_smbus_write_byte_data(client, reg, val); 115 if (unlikely(err < 0)) 116 dev_err(&client->dev, "%d-bit %s failed at 0x%02x\n", 117 8, "write", reg); 118 119 return err; 120} 121 122static struct emc6w201_data *emc6w201_update_device(struct device *dev) 123{ 124 struct emc6w201_data *data = dev_get_drvdata(dev); 125 struct i2c_client *client = data->client; 126 int nr; 127 128 mutex_lock(&data->update_lock); 129 130 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) { 131 for (nr = 0; nr < 6; nr++) { 132 data->in[input][nr] = 133 emc6w201_read8(client, 134 EMC6W201_REG_IN(nr)); 135 data->in[min][nr] = 136 emc6w201_read8(client, 137 EMC6W201_REG_IN_LOW(nr)); 138 data->in[max][nr] = 139 emc6w201_read8(client, 140 EMC6W201_REG_IN_HIGH(nr)); 141 } 142 143 for (nr = 0; nr < 6; nr++) { 144 data->temp[input][nr] = 145 emc6w201_read8(client, 146 EMC6W201_REG_TEMP(nr)); 147 data->temp[min][nr] = 148 emc6w201_read8(client, 149 EMC6W201_REG_TEMP_LOW(nr)); 150 data->temp[max][nr] = 151 emc6w201_read8(client, 152 EMC6W201_REG_TEMP_HIGH(nr)); 153 } 154 155 for (nr = 0; nr < 5; nr++) { 156 data->fan[input][nr] = 157 emc6w201_read16(client, 158 EMC6W201_REG_FAN(nr)); 159 data->fan[min][nr] = 160 emc6w201_read16(client, 161 EMC6W201_REG_FAN_MIN(nr)); 162 } 163 164 data->last_updated = jiffies; 165 data->valid = true; 166 } 167 168 mutex_unlock(&data->update_lock); 169 170 return data; 171} 172 173/* 174 * Sysfs callback functions 175 */ 176 177static const s16 nominal_mv[6] = { 2500, 1500, 3300, 5000, 1500, 1500 }; 178 179static ssize_t in_show(struct device *dev, struct device_attribute *devattr, 180 char *buf) 181{ 182 struct emc6w201_data *data = emc6w201_update_device(dev); 183 int sf = to_sensor_dev_attr_2(devattr)->index; 184 int nr = to_sensor_dev_attr_2(devattr)->nr; 185 186 return sprintf(buf, "%u\n", 187 (unsigned)data->in[sf][nr] * nominal_mv[nr] / 0xC0); 188} 189 190static ssize_t in_store(struct device *dev, struct device_attribute *devattr, 191 const char *buf, size_t count) 192{ 193 struct emc6w201_data *data = dev_get_drvdata(dev); 194 struct i2c_client *client = data->client; 195 int sf = to_sensor_dev_attr_2(devattr)->index; 196 int nr = to_sensor_dev_attr_2(devattr)->nr; 197 int err; 198 long val; 199 u8 reg; 200 201 err = kstrtol(buf, 10, &val); 202 if (err < 0) 203 return err; 204 205 val = clamp_val(val, 0, 255 * nominal_mv[nr] / 192); 206 val = DIV_ROUND_CLOSEST(val * 192, nominal_mv[nr]); 207 reg = (sf == min) ? EMC6W201_REG_IN_LOW(nr) 208 : EMC6W201_REG_IN_HIGH(nr); 209 210 mutex_lock(&data->update_lock); 211 data->in[sf][nr] = val; 212 err = emc6w201_write8(client, reg, data->in[sf][nr]); 213 mutex_unlock(&data->update_lock); 214 215 return err < 0 ? err : count; 216} 217 218static ssize_t temp_show(struct device *dev, struct device_attribute *devattr, 219 char *buf) 220{ 221 struct emc6w201_data *data = emc6w201_update_device(dev); 222 int sf = to_sensor_dev_attr_2(devattr)->index; 223 int nr = to_sensor_dev_attr_2(devattr)->nr; 224 225 return sprintf(buf, "%d\n", (int)data->temp[sf][nr] * 1000); 226} 227 228static ssize_t temp_store(struct device *dev, 229 struct device_attribute *devattr, const char *buf, 230 size_t count) 231{ 232 struct emc6w201_data *data = dev_get_drvdata(dev); 233 struct i2c_client *client = data->client; 234 int sf = to_sensor_dev_attr_2(devattr)->index; 235 int nr = to_sensor_dev_attr_2(devattr)->nr; 236 int err; 237 long val; 238 u8 reg; 239 240 err = kstrtol(buf, 10, &val); 241 if (err < 0) 242 return err; 243 244 val = clamp_val(val, -127000, 127000); 245 val = DIV_ROUND_CLOSEST(val, 1000); 246 reg = (sf == min) ? EMC6W201_REG_TEMP_LOW(nr) 247 : EMC6W201_REG_TEMP_HIGH(nr); 248 249 mutex_lock(&data->update_lock); 250 data->temp[sf][nr] = val; 251 err = emc6w201_write8(client, reg, data->temp[sf][nr]); 252 mutex_unlock(&data->update_lock); 253 254 return err < 0 ? err : count; 255} 256 257static ssize_t fan_show(struct device *dev, struct device_attribute *devattr, 258 char *buf) 259{ 260 struct emc6w201_data *data = emc6w201_update_device(dev); 261 int sf = to_sensor_dev_attr_2(devattr)->index; 262 int nr = to_sensor_dev_attr_2(devattr)->nr; 263 unsigned rpm; 264 265 if (data->fan[sf][nr] == 0 || data->fan[sf][nr] == 0xFFFF) 266 rpm = 0; 267 else 268 rpm = 5400000U / data->fan[sf][nr]; 269 270 return sprintf(buf, "%u\n", rpm); 271} 272 273static ssize_t fan_store(struct device *dev, struct device_attribute *devattr, 274 const char *buf, size_t count) 275{ 276 struct emc6w201_data *data = dev_get_drvdata(dev); 277 struct i2c_client *client = data->client; 278 int sf = to_sensor_dev_attr_2(devattr)->index; 279 int nr = to_sensor_dev_attr_2(devattr)->nr; 280 int err; 281 unsigned long val; 282 283 err = kstrtoul(buf, 10, &val); 284 if (err < 0) 285 return err; 286 287 if (val == 0) { 288 val = 0xFFFF; 289 } else { 290 val = DIV_ROUND_CLOSEST(5400000U, val); 291 val = clamp_val(val, 0, 0xFFFE); 292 } 293 294 mutex_lock(&data->update_lock); 295 data->fan[sf][nr] = val; 296 err = emc6w201_write16(client, EMC6W201_REG_FAN_MIN(nr), 297 data->fan[sf][nr]); 298 mutex_unlock(&data->update_lock); 299 300 return err < 0 ? err : count; 301} 302 303static SENSOR_DEVICE_ATTR_2_RO(in0_input, in, 0, input); 304static SENSOR_DEVICE_ATTR_2_RW(in0_min, in, 0, min); 305static SENSOR_DEVICE_ATTR_2_RW(in0_max, in, 0, max); 306static SENSOR_DEVICE_ATTR_2_RO(in1_input, in, 1, input); 307static SENSOR_DEVICE_ATTR_2_RW(in1_min, in, 1, min); 308static SENSOR_DEVICE_ATTR_2_RW(in1_max, in, 1, max); 309static SENSOR_DEVICE_ATTR_2_RO(in2_input, in, 2, input); 310static SENSOR_DEVICE_ATTR_2_RW(in2_min, in, 2, min); 311static SENSOR_DEVICE_ATTR_2_RW(in2_max, in, 2, max); 312static SENSOR_DEVICE_ATTR_2_RO(in3_input, in, 3, input); 313static SENSOR_DEVICE_ATTR_2_RW(in3_min, in, 3, min); 314static SENSOR_DEVICE_ATTR_2_RW(in3_max, in, 3, max); 315static SENSOR_DEVICE_ATTR_2_RO(in4_input, in, 4, input); 316static SENSOR_DEVICE_ATTR_2_RW(in4_min, in, 4, min); 317static SENSOR_DEVICE_ATTR_2_RW(in4_max, in, 4, max); 318static SENSOR_DEVICE_ATTR_2_RO(in5_input, in, 5, input); 319static SENSOR_DEVICE_ATTR_2_RW(in5_min, in, 5, min); 320static SENSOR_DEVICE_ATTR_2_RW(in5_max, in, 5, max); 321 322static SENSOR_DEVICE_ATTR_2_RO(temp1_input, temp, 0, input); 323static SENSOR_DEVICE_ATTR_2_RW(temp1_min, temp, 0, min); 324static SENSOR_DEVICE_ATTR_2_RW(temp1_max, temp, 0, max); 325static SENSOR_DEVICE_ATTR_2_RO(temp2_input, temp, 1, input); 326static SENSOR_DEVICE_ATTR_2_RW(temp2_min, temp, 1, min); 327static SENSOR_DEVICE_ATTR_2_RW(temp2_max, temp, 1, max); 328static SENSOR_DEVICE_ATTR_2_RO(temp3_input, temp, 2, input); 329static SENSOR_DEVICE_ATTR_2_RW(temp3_min, temp, 2, min); 330static SENSOR_DEVICE_ATTR_2_RW(temp3_max, temp, 2, max); 331static SENSOR_DEVICE_ATTR_2_RO(temp4_input, temp, 3, input); 332static SENSOR_DEVICE_ATTR_2_RW(temp4_min, temp, 3, min); 333static SENSOR_DEVICE_ATTR_2_RW(temp4_max, temp, 3, max); 334static SENSOR_DEVICE_ATTR_2_RO(temp5_input, temp, 4, input); 335static SENSOR_DEVICE_ATTR_2_RW(temp5_min, temp, 4, min); 336static SENSOR_DEVICE_ATTR_2_RW(temp5_max, temp, 4, max); 337static SENSOR_DEVICE_ATTR_2_RO(temp6_input, temp, 5, input); 338static SENSOR_DEVICE_ATTR_2_RW(temp6_min, temp, 5, min); 339static SENSOR_DEVICE_ATTR_2_RW(temp6_max, temp, 5, max); 340 341static SENSOR_DEVICE_ATTR_2_RO(fan1_input, fan, 0, input); 342static SENSOR_DEVICE_ATTR_2_RW(fan1_min, fan, 0, min); 343static SENSOR_DEVICE_ATTR_2_RO(fan2_input, fan, 1, input); 344static SENSOR_DEVICE_ATTR_2_RW(fan2_min, fan, 1, min); 345static SENSOR_DEVICE_ATTR_2_RO(fan3_input, fan, 2, input); 346static SENSOR_DEVICE_ATTR_2_RW(fan3_min, fan, 2, min); 347static SENSOR_DEVICE_ATTR_2_RO(fan4_input, fan, 3, input); 348static SENSOR_DEVICE_ATTR_2_RW(fan4_min, fan, 3, min); 349static SENSOR_DEVICE_ATTR_2_RO(fan5_input, fan, 4, input); 350static SENSOR_DEVICE_ATTR_2_RW(fan5_min, fan, 4, min); 351 352static struct attribute *emc6w201_attrs[] = { 353 &sensor_dev_attr_in0_input.dev_attr.attr, 354 &sensor_dev_attr_in0_min.dev_attr.attr, 355 &sensor_dev_attr_in0_max.dev_attr.attr, 356 &sensor_dev_attr_in1_input.dev_attr.attr, 357 &sensor_dev_attr_in1_min.dev_attr.attr, 358 &sensor_dev_attr_in1_max.dev_attr.attr, 359 &sensor_dev_attr_in2_input.dev_attr.attr, 360 &sensor_dev_attr_in2_min.dev_attr.attr, 361 &sensor_dev_attr_in2_max.dev_attr.attr, 362 &sensor_dev_attr_in3_input.dev_attr.attr, 363 &sensor_dev_attr_in3_min.dev_attr.attr, 364 &sensor_dev_attr_in3_max.dev_attr.attr, 365 &sensor_dev_attr_in4_input.dev_attr.attr, 366 &sensor_dev_attr_in4_min.dev_attr.attr, 367 &sensor_dev_attr_in4_max.dev_attr.attr, 368 &sensor_dev_attr_in5_input.dev_attr.attr, 369 &sensor_dev_attr_in5_min.dev_attr.attr, 370 &sensor_dev_attr_in5_max.dev_attr.attr, 371 372 &sensor_dev_attr_temp1_input.dev_attr.attr, 373 &sensor_dev_attr_temp1_min.dev_attr.attr, 374 &sensor_dev_attr_temp1_max.dev_attr.attr, 375 &sensor_dev_attr_temp2_input.dev_attr.attr, 376 &sensor_dev_attr_temp2_min.dev_attr.attr, 377 &sensor_dev_attr_temp2_max.dev_attr.attr, 378 &sensor_dev_attr_temp3_input.dev_attr.attr, 379 &sensor_dev_attr_temp3_min.dev_attr.attr, 380 &sensor_dev_attr_temp3_max.dev_attr.attr, 381 &sensor_dev_attr_temp4_input.dev_attr.attr, 382 &sensor_dev_attr_temp4_min.dev_attr.attr, 383 &sensor_dev_attr_temp4_max.dev_attr.attr, 384 &sensor_dev_attr_temp5_input.dev_attr.attr, 385 &sensor_dev_attr_temp5_min.dev_attr.attr, 386 &sensor_dev_attr_temp5_max.dev_attr.attr, 387 &sensor_dev_attr_temp6_input.dev_attr.attr, 388 &sensor_dev_attr_temp6_min.dev_attr.attr, 389 &sensor_dev_attr_temp6_max.dev_attr.attr, 390 391 &sensor_dev_attr_fan1_input.dev_attr.attr, 392 &sensor_dev_attr_fan1_min.dev_attr.attr, 393 &sensor_dev_attr_fan2_input.dev_attr.attr, 394 &sensor_dev_attr_fan2_min.dev_attr.attr, 395 &sensor_dev_attr_fan3_input.dev_attr.attr, 396 &sensor_dev_attr_fan3_min.dev_attr.attr, 397 &sensor_dev_attr_fan4_input.dev_attr.attr, 398 &sensor_dev_attr_fan4_min.dev_attr.attr, 399 &sensor_dev_attr_fan5_input.dev_attr.attr, 400 &sensor_dev_attr_fan5_min.dev_attr.attr, 401 NULL 402}; 403 404ATTRIBUTE_GROUPS(emc6w201); 405 406/* 407 * Driver interface 408 */ 409 410/* Return 0 if detection is successful, -ENODEV otherwise */ 411static int emc6w201_detect(struct i2c_client *client, 412 struct i2c_board_info *info) 413{ 414 struct i2c_adapter *adapter = client->adapter; 415 int company, verstep, config; 416 417 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 418 return -ENODEV; 419 420 /* Identification */ 421 company = i2c_smbus_read_byte_data(client, EMC6W201_REG_COMPANY); 422 if (company != 0x5C) 423 return -ENODEV; 424 verstep = i2c_smbus_read_byte_data(client, EMC6W201_REG_VERSTEP); 425 if (verstep < 0 || (verstep & 0xF0) != 0xB0) 426 return -ENODEV; 427 if ((verstep & 0x0F) > 2) { 428 dev_dbg(&client->dev, "Unknown EMC6W201 stepping %d\n", 429 verstep & 0x0F); 430 return -ENODEV; 431 } 432 433 /* Check configuration */ 434 config = i2c_smbus_read_byte_data(client, EMC6W201_REG_CONFIG); 435 if (config < 0 || (config & 0xF4) != 0x04) 436 return -ENODEV; 437 if (!(config & 0x01)) { 438 dev_err(&client->dev, "Monitoring not enabled\n"); 439 return -ENODEV; 440 } 441 442 strscpy(info->type, "emc6w201", I2C_NAME_SIZE); 443 444 return 0; 445} 446 447static int emc6w201_probe(struct i2c_client *client) 448{ 449 struct device *dev = &client->dev; 450 struct emc6w201_data *data; 451 struct device *hwmon_dev; 452 453 data = devm_kzalloc(dev, sizeof(struct emc6w201_data), GFP_KERNEL); 454 if (!data) 455 return -ENOMEM; 456 457 data->client = client; 458 mutex_init(&data->update_lock); 459 460 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, 461 data, 462 emc6w201_groups); 463 return PTR_ERR_OR_ZERO(hwmon_dev); 464} 465 466static const struct i2c_device_id emc6w201_id[] = { 467 { "emc6w201", 0 }, 468 { } 469}; 470MODULE_DEVICE_TABLE(i2c, emc6w201_id); 471 472static struct i2c_driver emc6w201_driver = { 473 .class = I2C_CLASS_HWMON, 474 .driver = { 475 .name = "emc6w201", 476 }, 477 .probe = emc6w201_probe, 478 .id_table = emc6w201_id, 479 .detect = emc6w201_detect, 480 .address_list = normal_i2c, 481}; 482 483module_i2c_driver(emc6w201_driver); 484 485MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de>"); 486MODULE_DESCRIPTION("SMSC EMC6W201 hardware monitoring driver"); 487MODULE_LICENSE("GPL"); 488