1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * amc6821.c - Part of lm_sensors, Linux kernel modules for hardware 4 * monitoring 5 * Copyright (C) 2009 T. Mertelj <tomaz.mertelj@guest.arnes.si> 6 * 7 * Based on max6650.c: 8 * Copyright (C) 2007 Hans J. Koch <hjk@hansjkoch.de> 9 */ 10 11 #include <linux/kernel.h> /* Needed for KERN_INFO */ 12 #include <linux/module.h> 13 #include <linux/init.h> 14 #include <linux/slab.h> 15 #include <linux/jiffies.h> 16 #include <linux/i2c.h> 17 #include <linux/hwmon.h> 18 #include <linux/hwmon-sysfs.h> 19 #include <linux/err.h> 20 #include <linux/mutex.h> 21 22 /* 23 * Addresses to scan. 24 */ 25 26 static const unsigned short normal_i2c[] = {0x18, 0x19, 0x1a, 0x2c, 0x2d, 0x2e, 27 0x4c, 0x4d, 0x4e, I2C_CLIENT_END}; 28 29 /* 30 * Insmod parameters 31 */ 32 33 static int pwminv; /*Inverted PWM output. */ 34 module_param(pwminv, int, 0444); 35 36 static int init = 1; /*Power-on initialization.*/ 37 module_param(init, int, 0444); 38 39 enum chips { amc6821 }; 40 41 #define AMC6821_REG_DEV_ID 0x3D 42 #define AMC6821_REG_COMP_ID 0x3E 43 #define AMC6821_REG_CONF1 0x00 44 #define AMC6821_REG_CONF2 0x01 45 #define AMC6821_REG_CONF3 0x3F 46 #define AMC6821_REG_CONF4 0x04 47 #define AMC6821_REG_STAT1 0x02 48 #define AMC6821_REG_STAT2 0x03 49 #define AMC6821_REG_TDATA_LOW 0x08 50 #define AMC6821_REG_TDATA_HI 0x09 51 #define AMC6821_REG_LTEMP_HI 0x0A 52 #define AMC6821_REG_RTEMP_HI 0x0B 53 #define AMC6821_REG_LTEMP_LIMIT_MIN 0x15 54 #define AMC6821_REG_LTEMP_LIMIT_MAX 0x14 55 #define AMC6821_REG_RTEMP_LIMIT_MIN 0x19 56 #define AMC6821_REG_RTEMP_LIMIT_MAX 0x18 57 #define AMC6821_REG_LTEMP_CRIT 0x1B 58 #define AMC6821_REG_RTEMP_CRIT 0x1D 59 #define AMC6821_REG_PSV_TEMP 0x1C 60 #define AMC6821_REG_DCY 0x22 61 #define AMC6821_REG_LTEMP_FAN_CTRL 0x24 62 #define AMC6821_REG_RTEMP_FAN_CTRL 0x25 63 #define AMC6821_REG_DCY_LOW_TEMP 0x21 64 65 #define AMC6821_REG_TACH_LLIMITL 0x10 66 #define AMC6821_REG_TACH_LLIMITH 0x11 67 #define AMC6821_REG_TACH_HLIMITL 0x12 68 #define AMC6821_REG_TACH_HLIMITH 0x13 69 70 #define AMC6821_CONF1_START 0x01 71 #define AMC6821_CONF1_FAN_INT_EN 0x02 72 #define AMC6821_CONF1_FANIE 0x04 73 #define AMC6821_CONF1_PWMINV 0x08 74 #define AMC6821_CONF1_FAN_FAULT_EN 0x10 75 #define AMC6821_CONF1_FDRC0 0x20 76 #define AMC6821_CONF1_FDRC1 0x40 77 #define AMC6821_CONF1_THERMOVIE 0x80 78 79 #define AMC6821_CONF2_PWM_EN 0x01 80 #define AMC6821_CONF2_TACH_MODE 0x02 81 #define AMC6821_CONF2_TACH_EN 0x04 82 #define AMC6821_CONF2_RTFIE 0x08 83 #define AMC6821_CONF2_LTOIE 0x10 84 #define AMC6821_CONF2_RTOIE 0x20 85 #define AMC6821_CONF2_PSVIE 0x40 86 #define AMC6821_CONF2_RST 0x80 87 88 #define AMC6821_CONF3_THERM_FAN_EN 0x80 89 #define AMC6821_CONF3_REV_MASK 0x0F 90 91 #define AMC6821_CONF4_OVREN 0x10 92 #define AMC6821_CONF4_TACH_FAST 0x20 93 #define AMC6821_CONF4_PSPR 0x40 94 #define AMC6821_CONF4_MODE 0x80 95 96 #define AMC6821_STAT1_RPM_ALARM 0x01 97 #define AMC6821_STAT1_FANS 0x02 98 #define AMC6821_STAT1_RTH 0x04 99 #define AMC6821_STAT1_RTL 0x08 100 #define AMC6821_STAT1_R_THERM 0x10 101 #define AMC6821_STAT1_RTF 0x20 102 #define AMC6821_STAT1_LTH 0x40 103 #define AMC6821_STAT1_LTL 0x80 104 105 #define AMC6821_STAT2_RTC 0x08 106 #define AMC6821_STAT2_LTC 0x10 107 #define AMC6821_STAT2_LPSV 0x20 108 #define AMC6821_STAT2_L_THERM 0x40 109 #define AMC6821_STAT2_THERM_IN 0x80 110 111 enum {IDX_TEMP1_INPUT = 0, IDX_TEMP1_MIN, IDX_TEMP1_MAX, 112 IDX_TEMP1_CRIT, IDX_TEMP2_INPUT, IDX_TEMP2_MIN, 113 IDX_TEMP2_MAX, IDX_TEMP2_CRIT, 114 TEMP_IDX_LEN, }; 115 116 static const u8 temp_reg[] = {AMC6821_REG_LTEMP_HI, 117 AMC6821_REG_LTEMP_LIMIT_MIN, 118 AMC6821_REG_LTEMP_LIMIT_MAX, 119 AMC6821_REG_LTEMP_CRIT, 120 AMC6821_REG_RTEMP_HI, 121 AMC6821_REG_RTEMP_LIMIT_MIN, 122 AMC6821_REG_RTEMP_LIMIT_MAX, 123 AMC6821_REG_RTEMP_CRIT, }; 124 125 enum {IDX_FAN1_INPUT = 0, IDX_FAN1_MIN, IDX_FAN1_MAX, 126 FAN1_IDX_LEN, }; 127 128 static const u8 fan_reg_low[] = {AMC6821_REG_TDATA_LOW, 129 AMC6821_REG_TACH_LLIMITL, 130 AMC6821_REG_TACH_HLIMITL, }; 131 132 133 static const u8 fan_reg_hi[] = {AMC6821_REG_TDATA_HI, 134 AMC6821_REG_TACH_LLIMITH, 135 AMC6821_REG_TACH_HLIMITH, }; 136 137 /* 138 * Client data (each client gets its own) 139 */ 140 141 struct amc6821_data { 142 struct i2c_client *client; 143 struct mutex update_lock; 144 bool valid; /* false until following fields are valid */ 145 unsigned long last_updated; /* in jiffies */ 146 147 /* register values */ 148 int temp[TEMP_IDX_LEN]; 149 150 u16 fan[FAN1_IDX_LEN]; 151 u8 fan1_div; 152 153 u8 pwm1; 154 u8 temp1_auto_point_temp[3]; 155 u8 temp2_auto_point_temp[3]; 156 u8 pwm1_auto_point_pwm[3]; 157 u8 pwm1_enable; 158 u8 pwm1_auto_channels_temp; 159 160 u8 stat1; 161 u8 stat2; 162 }; 163 164 static struct amc6821_data *amc6821_update_device(struct device *dev) 165 { 166 struct amc6821_data *data = dev_get_drvdata(dev); 167 struct i2c_client *client = data->client; 168 int timeout = HZ; 169 u8 reg; 170 int i; 171 172 mutex_lock(&data->update_lock); 173 174 if (time_after(jiffies, data->last_updated + timeout) || 175 !data->valid) { 176 177 for (i = 0; i < TEMP_IDX_LEN; i++) 178 data->temp[i] = (int8_t)i2c_smbus_read_byte_data( 179 client, temp_reg[i]); 180 181 data->stat1 = i2c_smbus_read_byte_data(client, 182 AMC6821_REG_STAT1); 183 data->stat2 = i2c_smbus_read_byte_data(client, 184 AMC6821_REG_STAT2); 185 186 data->pwm1 = i2c_smbus_read_byte_data(client, 187 AMC6821_REG_DCY); 188 for (i = 0; i < FAN1_IDX_LEN; i++) { 189 data->fan[i] = i2c_smbus_read_byte_data( 190 client, 191 fan_reg_low[i]); 192 data->fan[i] += i2c_smbus_read_byte_data( 193 client, 194 fan_reg_hi[i]) << 8; 195 } 196 data->fan1_div = i2c_smbus_read_byte_data(client, 197 AMC6821_REG_CONF4); 198 data->fan1_div = data->fan1_div & AMC6821_CONF4_PSPR ? 4 : 2; 199 200 data->pwm1_auto_point_pwm[0] = 0; 201 data->pwm1_auto_point_pwm[2] = 255; 202 data->pwm1_auto_point_pwm[1] = i2c_smbus_read_byte_data(client, 203 AMC6821_REG_DCY_LOW_TEMP); 204 205 data->temp1_auto_point_temp[0] = 206 i2c_smbus_read_byte_data(client, 207 AMC6821_REG_PSV_TEMP); 208 data->temp2_auto_point_temp[0] = 209 data->temp1_auto_point_temp[0]; 210 reg = i2c_smbus_read_byte_data(client, 211 AMC6821_REG_LTEMP_FAN_CTRL); 212 data->temp1_auto_point_temp[1] = (reg & 0xF8) >> 1; 213 reg &= 0x07; 214 reg = 0x20 >> reg; 215 if (reg > 0) 216 data->temp1_auto_point_temp[2] = 217 data->temp1_auto_point_temp[1] + 218 (data->pwm1_auto_point_pwm[2] - 219 data->pwm1_auto_point_pwm[1]) / reg; 220 else 221 data->temp1_auto_point_temp[2] = 255; 222 223 reg = i2c_smbus_read_byte_data(client, 224 AMC6821_REG_RTEMP_FAN_CTRL); 225 data->temp2_auto_point_temp[1] = (reg & 0xF8) >> 1; 226 reg &= 0x07; 227 reg = 0x20 >> reg; 228 if (reg > 0) 229 data->temp2_auto_point_temp[2] = 230 data->temp2_auto_point_temp[1] + 231 (data->pwm1_auto_point_pwm[2] - 232 data->pwm1_auto_point_pwm[1]) / reg; 233 else 234 data->temp2_auto_point_temp[2] = 255; 235 236 reg = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF1); 237 reg = (reg >> 5) & 0x3; 238 switch (reg) { 239 case 0: /*open loop: software sets pwm1*/ 240 data->pwm1_auto_channels_temp = 0; 241 data->pwm1_enable = 1; 242 break; 243 case 2: /*closed loop: remote T (temp2)*/ 244 data->pwm1_auto_channels_temp = 2; 245 data->pwm1_enable = 2; 246 break; 247 case 3: /*closed loop: local and remote T (temp2)*/ 248 data->pwm1_auto_channels_temp = 3; 249 data->pwm1_enable = 3; 250 break; 251 case 1: /* 252 * semi-open loop: software sets rpm, chip controls 253 * pwm1, currently not implemented 254 */ 255 data->pwm1_auto_channels_temp = 0; 256 data->pwm1_enable = 0; 257 break; 258 } 259 260 data->last_updated = jiffies; 261 data->valid = true; 262 } 263 mutex_unlock(&data->update_lock); 264 return data; 265 } 266 267 static ssize_t temp_show(struct device *dev, struct device_attribute *devattr, 268 char *buf) 269 { 270 struct amc6821_data *data = amc6821_update_device(dev); 271 int ix = to_sensor_dev_attr(devattr)->index; 272 273 return sprintf(buf, "%d\n", data->temp[ix] * 1000); 274 } 275 276 static ssize_t temp_store(struct device *dev, struct device_attribute *attr, 277 const char *buf, size_t count) 278 { 279 struct amc6821_data *data = dev_get_drvdata(dev); 280 struct i2c_client *client = data->client; 281 int ix = to_sensor_dev_attr(attr)->index; 282 long val; 283 284 int ret = kstrtol(buf, 10, &val); 285 if (ret) 286 return ret; 287 val = clamp_val(val / 1000, -128, 127); 288 289 mutex_lock(&data->update_lock); 290 data->temp[ix] = val; 291 if (i2c_smbus_write_byte_data(client, temp_reg[ix], data->temp[ix])) { 292 dev_err(&client->dev, "Register write error, aborting.\n"); 293 count = -EIO; 294 } 295 mutex_unlock(&data->update_lock); 296 return count; 297 } 298 299 static ssize_t temp_alarm_show(struct device *dev, 300 struct device_attribute *devattr, char *buf) 301 { 302 struct amc6821_data *data = amc6821_update_device(dev); 303 int ix = to_sensor_dev_attr(devattr)->index; 304 u8 flag; 305 306 switch (ix) { 307 case IDX_TEMP1_MIN: 308 flag = data->stat1 & AMC6821_STAT1_LTL; 309 break; 310 case IDX_TEMP1_MAX: 311 flag = data->stat1 & AMC6821_STAT1_LTH; 312 break; 313 case IDX_TEMP1_CRIT: 314 flag = data->stat2 & AMC6821_STAT2_LTC; 315 break; 316 case IDX_TEMP2_MIN: 317 flag = data->stat1 & AMC6821_STAT1_RTL; 318 break; 319 case IDX_TEMP2_MAX: 320 flag = data->stat1 & AMC6821_STAT1_RTH; 321 break; 322 case IDX_TEMP2_CRIT: 323 flag = data->stat2 & AMC6821_STAT2_RTC; 324 break; 325 default: 326 dev_dbg(dev, "Unknown attr->index (%d).\n", ix); 327 return -EINVAL; 328 } 329 if (flag) 330 return sprintf(buf, "1"); 331 else 332 return sprintf(buf, "0"); 333 } 334 335 static ssize_t temp2_fault_show(struct device *dev, 336 struct device_attribute *devattr, char *buf) 337 { 338 struct amc6821_data *data = amc6821_update_device(dev); 339 if (data->stat1 & AMC6821_STAT1_RTF) 340 return sprintf(buf, "1"); 341 else 342 return sprintf(buf, "0"); 343 } 344 345 static ssize_t pwm1_show(struct device *dev, struct device_attribute *devattr, 346 char *buf) 347 { 348 struct amc6821_data *data = amc6821_update_device(dev); 349 return sprintf(buf, "%d\n", data->pwm1); 350 } 351 352 static ssize_t pwm1_store(struct device *dev, 353 struct device_attribute *devattr, const char *buf, 354 size_t count) 355 { 356 struct amc6821_data *data = dev_get_drvdata(dev); 357 struct i2c_client *client = data->client; 358 long val; 359 int ret = kstrtol(buf, 10, &val); 360 if (ret) 361 return ret; 362 363 mutex_lock(&data->update_lock); 364 data->pwm1 = clamp_val(val , 0, 255); 365 i2c_smbus_write_byte_data(client, AMC6821_REG_DCY, data->pwm1); 366 mutex_unlock(&data->update_lock); 367 return count; 368 } 369 370 static ssize_t pwm1_enable_show(struct device *dev, 371 struct device_attribute *devattr, char *buf) 372 { 373 struct amc6821_data *data = amc6821_update_device(dev); 374 return sprintf(buf, "%d\n", data->pwm1_enable); 375 } 376 377 static ssize_t pwm1_enable_store(struct device *dev, 378 struct device_attribute *attr, 379 const char *buf, size_t count) 380 { 381 struct amc6821_data *data = dev_get_drvdata(dev); 382 struct i2c_client *client = data->client; 383 long val; 384 int config = kstrtol(buf, 10, &val); 385 if (config) 386 return config; 387 388 mutex_lock(&data->update_lock); 389 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF1); 390 if (config < 0) { 391 dev_err(&client->dev, 392 "Error reading configuration register, aborting.\n"); 393 count = config; 394 goto unlock; 395 } 396 397 switch (val) { 398 case 1: 399 config &= ~AMC6821_CONF1_FDRC0; 400 config &= ~AMC6821_CONF1_FDRC1; 401 break; 402 case 2: 403 config &= ~AMC6821_CONF1_FDRC0; 404 config |= AMC6821_CONF1_FDRC1; 405 break; 406 case 3: 407 config |= AMC6821_CONF1_FDRC0; 408 config |= AMC6821_CONF1_FDRC1; 409 break; 410 default: 411 count = -EINVAL; 412 goto unlock; 413 } 414 if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF1, config)) { 415 dev_err(&client->dev, 416 "Configuration register write error, aborting.\n"); 417 count = -EIO; 418 } 419 unlock: 420 mutex_unlock(&data->update_lock); 421 return count; 422 } 423 424 static ssize_t pwm1_auto_channels_temp_show(struct device *dev, 425 struct device_attribute *devattr, 426 char *buf) 427 { 428 struct amc6821_data *data = amc6821_update_device(dev); 429 return sprintf(buf, "%d\n", data->pwm1_auto_channels_temp); 430 } 431 432 static ssize_t temp_auto_point_temp_show(struct device *dev, 433 struct device_attribute *devattr, 434 char *buf) 435 { 436 int ix = to_sensor_dev_attr_2(devattr)->index; 437 int nr = to_sensor_dev_attr_2(devattr)->nr; 438 struct amc6821_data *data = amc6821_update_device(dev); 439 switch (nr) { 440 case 1: 441 return sprintf(buf, "%d\n", 442 data->temp1_auto_point_temp[ix] * 1000); 443 case 2: 444 return sprintf(buf, "%d\n", 445 data->temp2_auto_point_temp[ix] * 1000); 446 default: 447 dev_dbg(dev, "Unknown attr->nr (%d).\n", nr); 448 return -EINVAL; 449 } 450 } 451 452 static ssize_t pwm1_auto_point_pwm_show(struct device *dev, 453 struct device_attribute *devattr, 454 char *buf) 455 { 456 int ix = to_sensor_dev_attr(devattr)->index; 457 struct amc6821_data *data = amc6821_update_device(dev); 458 return sprintf(buf, "%d\n", data->pwm1_auto_point_pwm[ix]); 459 } 460 461 static inline ssize_t set_slope_register(struct i2c_client *client, 462 u8 reg, 463 u8 dpwm, 464 u8 *ptemp) 465 { 466 int dt; 467 u8 tmp; 468 469 dt = ptemp[2]-ptemp[1]; 470 for (tmp = 4; tmp > 0; tmp--) { 471 if (dt * (0x20 >> tmp) >= dpwm) 472 break; 473 } 474 tmp |= (ptemp[1] & 0x7C) << 1; 475 if (i2c_smbus_write_byte_data(client, 476 reg, tmp)) { 477 dev_err(&client->dev, "Register write error, aborting.\n"); 478 return -EIO; 479 } 480 return 0; 481 } 482 483 static ssize_t temp_auto_point_temp_store(struct device *dev, 484 struct device_attribute *attr, 485 const char *buf, size_t count) 486 { 487 struct amc6821_data *data = amc6821_update_device(dev); 488 struct i2c_client *client = data->client; 489 int ix = to_sensor_dev_attr_2(attr)->index; 490 int nr = to_sensor_dev_attr_2(attr)->nr; 491 u8 *ptemp; 492 u8 reg; 493 int dpwm; 494 long val; 495 int ret = kstrtol(buf, 10, &val); 496 if (ret) 497 return ret; 498 499 switch (nr) { 500 case 1: 501 ptemp = data->temp1_auto_point_temp; 502 reg = AMC6821_REG_LTEMP_FAN_CTRL; 503 break; 504 case 2: 505 ptemp = data->temp2_auto_point_temp; 506 reg = AMC6821_REG_RTEMP_FAN_CTRL; 507 break; 508 default: 509 dev_dbg(dev, "Unknown attr->nr (%d).\n", nr); 510 return -EINVAL; 511 } 512 513 mutex_lock(&data->update_lock); 514 data->valid = false; 515 516 switch (ix) { 517 case 0: 518 ptemp[0] = clamp_val(val / 1000, 0, 519 data->temp1_auto_point_temp[1]); 520 ptemp[0] = clamp_val(ptemp[0], 0, 521 data->temp2_auto_point_temp[1]); 522 ptemp[0] = clamp_val(ptemp[0], 0, 63); 523 if (i2c_smbus_write_byte_data( 524 client, 525 AMC6821_REG_PSV_TEMP, 526 ptemp[0])) { 527 dev_err(&client->dev, 528 "Register write error, aborting.\n"); 529 count = -EIO; 530 } 531 goto EXIT; 532 case 1: 533 ptemp[1] = clamp_val(val / 1000, (ptemp[0] & 0x7C) + 4, 124); 534 ptemp[1] &= 0x7C; 535 ptemp[2] = clamp_val(ptemp[2], ptemp[1] + 1, 255); 536 break; 537 case 2: 538 ptemp[2] = clamp_val(val / 1000, ptemp[1]+1, 255); 539 break; 540 default: 541 dev_dbg(dev, "Unknown attr->index (%d).\n", ix); 542 count = -EINVAL; 543 goto EXIT; 544 } 545 dpwm = data->pwm1_auto_point_pwm[2] - data->pwm1_auto_point_pwm[1]; 546 if (set_slope_register(client, reg, dpwm, ptemp)) 547 count = -EIO; 548 549 EXIT: 550 mutex_unlock(&data->update_lock); 551 return count; 552 } 553 554 static ssize_t pwm1_auto_point_pwm_store(struct device *dev, 555 struct device_attribute *attr, 556 const char *buf, size_t count) 557 { 558 struct amc6821_data *data = dev_get_drvdata(dev); 559 struct i2c_client *client = data->client; 560 int dpwm; 561 long val; 562 int ret = kstrtol(buf, 10, &val); 563 if (ret) 564 return ret; 565 566 mutex_lock(&data->update_lock); 567 data->pwm1_auto_point_pwm[1] = clamp_val(val, 0, 254); 568 if (i2c_smbus_write_byte_data(client, AMC6821_REG_DCY_LOW_TEMP, 569 data->pwm1_auto_point_pwm[1])) { 570 dev_err(&client->dev, "Register write error, aborting.\n"); 571 count = -EIO; 572 goto EXIT; 573 } 574 dpwm = data->pwm1_auto_point_pwm[2] - data->pwm1_auto_point_pwm[1]; 575 if (set_slope_register(client, AMC6821_REG_LTEMP_FAN_CTRL, dpwm, 576 data->temp1_auto_point_temp)) { 577 count = -EIO; 578 goto EXIT; 579 } 580 if (set_slope_register(client, AMC6821_REG_RTEMP_FAN_CTRL, dpwm, 581 data->temp2_auto_point_temp)) { 582 count = -EIO; 583 goto EXIT; 584 } 585 586 EXIT: 587 data->valid = false; 588 mutex_unlock(&data->update_lock); 589 return count; 590 } 591 592 static ssize_t fan_show(struct device *dev, struct device_attribute *devattr, 593 char *buf) 594 { 595 struct amc6821_data *data = amc6821_update_device(dev); 596 int ix = to_sensor_dev_attr(devattr)->index; 597 if (0 == data->fan[ix]) 598 return sprintf(buf, "0"); 599 return sprintf(buf, "%d\n", (int)(6000000 / data->fan[ix])); 600 } 601 602 static ssize_t fan1_fault_show(struct device *dev, 603 struct device_attribute *devattr, char *buf) 604 { 605 struct amc6821_data *data = amc6821_update_device(dev); 606 if (data->stat1 & AMC6821_STAT1_FANS) 607 return sprintf(buf, "1"); 608 else 609 return sprintf(buf, "0"); 610 } 611 612 static ssize_t fan_store(struct device *dev, struct device_attribute *attr, 613 const char *buf, size_t count) 614 { 615 struct amc6821_data *data = dev_get_drvdata(dev); 616 struct i2c_client *client = data->client; 617 long val; 618 int ix = to_sensor_dev_attr(attr)->index; 619 int ret = kstrtol(buf, 10, &val); 620 if (ret) 621 return ret; 622 val = 1 > val ? 0xFFFF : 6000000/val; 623 624 mutex_lock(&data->update_lock); 625 data->fan[ix] = (u16) clamp_val(val, 1, 0xFFFF); 626 if (i2c_smbus_write_byte_data(client, fan_reg_low[ix], 627 data->fan[ix] & 0xFF)) { 628 dev_err(&client->dev, "Register write error, aborting.\n"); 629 count = -EIO; 630 goto EXIT; 631 } 632 if (i2c_smbus_write_byte_data(client, 633 fan_reg_hi[ix], data->fan[ix] >> 8)) { 634 dev_err(&client->dev, "Register write error, aborting.\n"); 635 count = -EIO; 636 } 637 EXIT: 638 mutex_unlock(&data->update_lock); 639 return count; 640 } 641 642 static ssize_t fan1_div_show(struct device *dev, 643 struct device_attribute *devattr, char *buf) 644 { 645 struct amc6821_data *data = amc6821_update_device(dev); 646 return sprintf(buf, "%d\n", data->fan1_div); 647 } 648 649 static ssize_t fan1_div_store(struct device *dev, 650 struct device_attribute *attr, const char *buf, 651 size_t count) 652 { 653 struct amc6821_data *data = dev_get_drvdata(dev); 654 struct i2c_client *client = data->client; 655 long val; 656 int config = kstrtol(buf, 10, &val); 657 if (config) 658 return config; 659 660 mutex_lock(&data->update_lock); 661 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF4); 662 if (config < 0) { 663 dev_err(&client->dev, 664 "Error reading configuration register, aborting.\n"); 665 count = config; 666 goto EXIT; 667 } 668 switch (val) { 669 case 2: 670 config &= ~AMC6821_CONF4_PSPR; 671 data->fan1_div = 2; 672 break; 673 case 4: 674 config |= AMC6821_CONF4_PSPR; 675 data->fan1_div = 4; 676 break; 677 default: 678 count = -EINVAL; 679 goto EXIT; 680 } 681 if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF4, config)) { 682 dev_err(&client->dev, 683 "Configuration register write error, aborting.\n"); 684 count = -EIO; 685 } 686 EXIT: 687 mutex_unlock(&data->update_lock); 688 return count; 689 } 690 691 static SENSOR_DEVICE_ATTR_RO(temp1_input, temp, IDX_TEMP1_INPUT); 692 static SENSOR_DEVICE_ATTR_RW(temp1_min, temp, IDX_TEMP1_MIN); 693 static SENSOR_DEVICE_ATTR_RW(temp1_max, temp, IDX_TEMP1_MAX); 694 static SENSOR_DEVICE_ATTR_RW(temp1_crit, temp, IDX_TEMP1_CRIT); 695 static SENSOR_DEVICE_ATTR_RO(temp1_min_alarm, temp_alarm, IDX_TEMP1_MIN); 696 static SENSOR_DEVICE_ATTR_RO(temp1_max_alarm, temp_alarm, IDX_TEMP1_MAX); 697 static SENSOR_DEVICE_ATTR_RO(temp1_crit_alarm, temp_alarm, IDX_TEMP1_CRIT); 698 static SENSOR_DEVICE_ATTR_RO(temp2_input, temp, IDX_TEMP2_INPUT); 699 static SENSOR_DEVICE_ATTR_RW(temp2_min, temp, IDX_TEMP2_MIN); 700 static SENSOR_DEVICE_ATTR_RW(temp2_max, temp, IDX_TEMP2_MAX); 701 static SENSOR_DEVICE_ATTR_RW(temp2_crit, temp, IDX_TEMP2_CRIT); 702 static SENSOR_DEVICE_ATTR_RO(temp2_fault, temp2_fault, 0); 703 static SENSOR_DEVICE_ATTR_RO(temp2_min_alarm, temp_alarm, IDX_TEMP2_MIN); 704 static SENSOR_DEVICE_ATTR_RO(temp2_max_alarm, temp_alarm, IDX_TEMP2_MAX); 705 static SENSOR_DEVICE_ATTR_RO(temp2_crit_alarm, temp_alarm, IDX_TEMP2_CRIT); 706 static SENSOR_DEVICE_ATTR_RO(fan1_input, fan, IDX_FAN1_INPUT); 707 static SENSOR_DEVICE_ATTR_RW(fan1_min, fan, IDX_FAN1_MIN); 708 static SENSOR_DEVICE_ATTR_RW(fan1_max, fan, IDX_FAN1_MAX); 709 static SENSOR_DEVICE_ATTR_RO(fan1_fault, fan1_fault, 0); 710 static SENSOR_DEVICE_ATTR_RW(fan1_div, fan1_div, 0); 711 712 static SENSOR_DEVICE_ATTR_RW(pwm1, pwm1, 0); 713 static SENSOR_DEVICE_ATTR_RW(pwm1_enable, pwm1_enable, 0); 714 static SENSOR_DEVICE_ATTR_RO(pwm1_auto_point1_pwm, pwm1_auto_point_pwm, 0); 715 static SENSOR_DEVICE_ATTR_RW(pwm1_auto_point2_pwm, pwm1_auto_point_pwm, 1); 716 static SENSOR_DEVICE_ATTR_RO(pwm1_auto_point3_pwm, pwm1_auto_point_pwm, 2); 717 static SENSOR_DEVICE_ATTR_RO(pwm1_auto_channels_temp, pwm1_auto_channels_temp, 718 0); 719 static SENSOR_DEVICE_ATTR_2_RO(temp1_auto_point1_temp, temp_auto_point_temp, 720 1, 0); 721 static SENSOR_DEVICE_ATTR_2_RW(temp1_auto_point2_temp, temp_auto_point_temp, 722 1, 1); 723 static SENSOR_DEVICE_ATTR_2_RW(temp1_auto_point3_temp, temp_auto_point_temp, 724 1, 2); 725 726 static SENSOR_DEVICE_ATTR_2_RW(temp2_auto_point1_temp, temp_auto_point_temp, 727 2, 0); 728 static SENSOR_DEVICE_ATTR_2_RW(temp2_auto_point2_temp, temp_auto_point_temp, 729 2, 1); 730 static SENSOR_DEVICE_ATTR_2_RW(temp2_auto_point3_temp, temp_auto_point_temp, 731 2, 2); 732 733 static struct attribute *amc6821_attrs[] = { 734 &sensor_dev_attr_temp1_input.dev_attr.attr, 735 &sensor_dev_attr_temp1_min.dev_attr.attr, 736 &sensor_dev_attr_temp1_max.dev_attr.attr, 737 &sensor_dev_attr_temp1_crit.dev_attr.attr, 738 &sensor_dev_attr_temp1_min_alarm.dev_attr.attr, 739 &sensor_dev_attr_temp1_max_alarm.dev_attr.attr, 740 &sensor_dev_attr_temp1_crit_alarm.dev_attr.attr, 741 &sensor_dev_attr_temp2_input.dev_attr.attr, 742 &sensor_dev_attr_temp2_min.dev_attr.attr, 743 &sensor_dev_attr_temp2_max.dev_attr.attr, 744 &sensor_dev_attr_temp2_crit.dev_attr.attr, 745 &sensor_dev_attr_temp2_min_alarm.dev_attr.attr, 746 &sensor_dev_attr_temp2_max_alarm.dev_attr.attr, 747 &sensor_dev_attr_temp2_crit_alarm.dev_attr.attr, 748 &sensor_dev_attr_temp2_fault.dev_attr.attr, 749 &sensor_dev_attr_fan1_input.dev_attr.attr, 750 &sensor_dev_attr_fan1_min.dev_attr.attr, 751 &sensor_dev_attr_fan1_max.dev_attr.attr, 752 &sensor_dev_attr_fan1_fault.dev_attr.attr, 753 &sensor_dev_attr_fan1_div.dev_attr.attr, 754 &sensor_dev_attr_pwm1.dev_attr.attr, 755 &sensor_dev_attr_pwm1_enable.dev_attr.attr, 756 &sensor_dev_attr_pwm1_auto_channels_temp.dev_attr.attr, 757 &sensor_dev_attr_pwm1_auto_point1_pwm.dev_attr.attr, 758 &sensor_dev_attr_pwm1_auto_point2_pwm.dev_attr.attr, 759 &sensor_dev_attr_pwm1_auto_point3_pwm.dev_attr.attr, 760 &sensor_dev_attr_temp1_auto_point1_temp.dev_attr.attr, 761 &sensor_dev_attr_temp1_auto_point2_temp.dev_attr.attr, 762 &sensor_dev_attr_temp1_auto_point3_temp.dev_attr.attr, 763 &sensor_dev_attr_temp2_auto_point1_temp.dev_attr.attr, 764 &sensor_dev_attr_temp2_auto_point2_temp.dev_attr.attr, 765 &sensor_dev_attr_temp2_auto_point3_temp.dev_attr.attr, 766 NULL 767 }; 768 769 ATTRIBUTE_GROUPS(amc6821); 770 771 /* Return 0 if detection is successful, -ENODEV otherwise */ 772 static int amc6821_detect( 773 struct i2c_client *client, 774 struct i2c_board_info *info) 775 { 776 struct i2c_adapter *adapter = client->adapter; 777 int address = client->addr; 778 int dev_id, comp_id; 779 780 dev_dbg(&adapter->dev, "amc6821_detect called.\n"); 781 782 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) { 783 dev_dbg(&adapter->dev, 784 "amc6821: I2C bus doesn't support byte mode, " 785 "skipping.\n"); 786 return -ENODEV; 787 } 788 789 dev_id = i2c_smbus_read_byte_data(client, AMC6821_REG_DEV_ID); 790 comp_id = i2c_smbus_read_byte_data(client, AMC6821_REG_COMP_ID); 791 if (dev_id != 0x21 || comp_id != 0x49) { 792 dev_dbg(&adapter->dev, 793 "amc6821: detection failed at 0x%02x.\n", 794 address); 795 return -ENODEV; 796 } 797 798 /* 799 * Bit 7 of the address register is ignored, so we can check the 800 * ID registers again 801 */ 802 dev_id = i2c_smbus_read_byte_data(client, 0x80 | AMC6821_REG_DEV_ID); 803 comp_id = i2c_smbus_read_byte_data(client, 0x80 | AMC6821_REG_COMP_ID); 804 if (dev_id != 0x21 || comp_id != 0x49) { 805 dev_dbg(&adapter->dev, 806 "amc6821: detection failed at 0x%02x.\n", 807 address); 808 return -ENODEV; 809 } 810 811 dev_info(&adapter->dev, "amc6821: chip found at 0x%02x.\n", address); 812 strscpy(info->type, "amc6821", I2C_NAME_SIZE); 813 814 return 0; 815 } 816 817 static int amc6821_init_client(struct i2c_client *client) 818 { 819 int config; 820 int err = -EIO; 821 822 if (init) { 823 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF4); 824 825 if (config < 0) { 826 dev_err(&client->dev, 827 "Error reading configuration register, aborting.\n"); 828 return err; 829 } 830 831 config |= AMC6821_CONF4_MODE; 832 833 if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF4, 834 config)) { 835 dev_err(&client->dev, 836 "Configuration register write error, aborting.\n"); 837 return err; 838 } 839 840 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF3); 841 842 if (config < 0) { 843 dev_err(&client->dev, 844 "Error reading configuration register, aborting.\n"); 845 return err; 846 } 847 848 dev_info(&client->dev, "Revision %d\n", config & 0x0f); 849 850 config &= ~AMC6821_CONF3_THERM_FAN_EN; 851 852 if (i2c_smbus_write_byte_data(client, AMC6821_REG_CONF3, 853 config)) { 854 dev_err(&client->dev, 855 "Configuration register write error, aborting.\n"); 856 return err; 857 } 858 859 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF2); 860 861 if (config < 0) { 862 dev_err(&client->dev, 863 "Error reading configuration register, aborting.\n"); 864 return err; 865 } 866 867 config &= ~AMC6821_CONF2_RTFIE; 868 config &= ~AMC6821_CONF2_LTOIE; 869 config &= ~AMC6821_CONF2_RTOIE; 870 if (i2c_smbus_write_byte_data(client, 871 AMC6821_REG_CONF2, config)) { 872 dev_err(&client->dev, 873 "Configuration register write error, aborting.\n"); 874 return err; 875 } 876 877 config = i2c_smbus_read_byte_data(client, AMC6821_REG_CONF1); 878 879 if (config < 0) { 880 dev_err(&client->dev, 881 "Error reading configuration register, aborting.\n"); 882 return err; 883 } 884 885 config &= ~AMC6821_CONF1_THERMOVIE; 886 config &= ~AMC6821_CONF1_FANIE; 887 config |= AMC6821_CONF1_START; 888 if (pwminv) 889 config |= AMC6821_CONF1_PWMINV; 890 else 891 config &= ~AMC6821_CONF1_PWMINV; 892 893 if (i2c_smbus_write_byte_data( 894 client, AMC6821_REG_CONF1, config)) { 895 dev_err(&client->dev, 896 "Configuration register write error, aborting.\n"); 897 return err; 898 } 899 } 900 return 0; 901 } 902 903 static int amc6821_probe(struct i2c_client *client) 904 { 905 struct device *dev = &client->dev; 906 struct amc6821_data *data; 907 struct device *hwmon_dev; 908 int err; 909 910 data = devm_kzalloc(dev, sizeof(struct amc6821_data), GFP_KERNEL); 911 if (!data) 912 return -ENOMEM; 913 914 data->client = client; 915 mutex_init(&data->update_lock); 916 917 /* 918 * Initialize the amc6821 chip 919 */ 920 err = amc6821_init_client(client); 921 if (err) 922 return err; 923 924 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, 925 data, 926 amc6821_groups); 927 return PTR_ERR_OR_ZERO(hwmon_dev); 928 } 929 930 static const struct i2c_device_id amc6821_id[] = { 931 { "amc6821", amc6821 }, 932 { } 933 }; 934 935 MODULE_DEVICE_TABLE(i2c, amc6821_id); 936 937 static const struct of_device_id __maybe_unused amc6821_of_match[] = { 938 { 939 .compatible = "ti,amc6821", 940 .data = (void *)amc6821, 941 }, 942 { } 943 }; 944 945 MODULE_DEVICE_TABLE(of, amc6821_of_match); 946 947 static struct i2c_driver amc6821_driver = { 948 .class = I2C_CLASS_HWMON, 949 .driver = { 950 .name = "amc6821", 951 .of_match_table = of_match_ptr(amc6821_of_match), 952 }, 953 .probe = amc6821_probe, 954 .id_table = amc6821_id, 955 .detect = amc6821_detect, 956 .address_list = normal_i2c, 957 }; 958 959 module_i2c_driver(amc6821_driver); 960 961 MODULE_LICENSE("GPL"); 962 MODULE_AUTHOR("T. Mertelj <tomaz.mertelj@guest.arnes.si>"); 963 MODULE_DESCRIPTION("Texas Instruments amc6821 hwmon driver"); 964