1 /* 2 * w83l786ng.c - Linux kernel driver for hardware monitoring 3 * Copyright (c) 2007 Kevin Lo <kevlo@kevlo.org> 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License as published by 7 * the Free Software Foundation - version 2. 8 * 9 * This program is distributed in the hope that it will be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write to the Free Software 16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 17 * 02110-1301 USA. 18 */ 19 20 /* 21 * Supports following chips: 22 * 23 * Chip #vin #fanin #pwm #temp wchipid vendid i2c ISA 24 * w83l786ng 3 2 2 2 0x7b 0x5ca3 yes no 25 */ 26 27 #include <linux/module.h> 28 #include <linux/init.h> 29 #include <linux/slab.h> 30 #include <linux/i2c.h> 31 #include <linux/hwmon.h> 32 #include <linux/hwmon-vid.h> 33 #include <linux/hwmon-sysfs.h> 34 #include <linux/err.h> 35 #include <linux/mutex.h> 36 #include <linux/jiffies.h> 37 38 /* Addresses to scan */ 39 static const unsigned short normal_i2c[] = { 0x2e, 0x2f, I2C_CLIENT_END }; 40 41 /* Insmod parameters */ 42 43 static bool reset; 44 module_param(reset, bool, 0); 45 MODULE_PARM_DESC(reset, "Set to 1 to reset chip, not recommended"); 46 47 #define W83L786NG_REG_IN_MIN(nr) (0x2C + (nr) * 2) 48 #define W83L786NG_REG_IN_MAX(nr) (0x2B + (nr) * 2) 49 #define W83L786NG_REG_IN(nr) ((nr) + 0x20) 50 51 #define W83L786NG_REG_FAN(nr) ((nr) + 0x28) 52 #define W83L786NG_REG_FAN_MIN(nr) ((nr) + 0x3B) 53 54 #define W83L786NG_REG_CONFIG 0x40 55 #define W83L786NG_REG_ALARM1 0x41 56 #define W83L786NG_REG_ALARM2 0x42 57 #define W83L786NG_REG_GPIO_EN 0x47 58 #define W83L786NG_REG_MAN_ID2 0x4C 59 #define W83L786NG_REG_MAN_ID1 0x4D 60 #define W83L786NG_REG_CHIP_ID 0x4E 61 62 #define W83L786NG_REG_DIODE 0x53 63 #define W83L786NG_REG_FAN_DIV 0x54 64 #define W83L786NG_REG_FAN_CFG 0x80 65 66 #define W83L786NG_REG_TOLERANCE 0x8D 67 68 static const u8 W83L786NG_REG_TEMP[2][3] = { 69 { 0x25, /* TEMP 0 in DataSheet */ 70 0x35, /* TEMP 0 Over in DataSheet */ 71 0x36 }, /* TEMP 0 Hyst in DataSheet */ 72 { 0x26, /* TEMP 1 in DataSheet */ 73 0x37, /* TEMP 1 Over in DataSheet */ 74 0x38 } /* TEMP 1 Hyst in DataSheet */ 75 }; 76 77 static const u8 W83L786NG_PWM_MODE_SHIFT[] = {6, 7}; 78 static const u8 W83L786NG_PWM_ENABLE_SHIFT[] = {2, 4}; 79 80 /* FAN Duty Cycle, be used to control */ 81 static const u8 W83L786NG_REG_PWM[] = {0x81, 0x87}; 82 83 84 static inline u8 85 FAN_TO_REG(long rpm, int div) 86 { 87 if (rpm == 0) 88 return 255; 89 rpm = clamp_val(rpm, 1, 1000000); 90 return clamp_val((1350000 + rpm * div / 2) / (rpm * div), 1, 254); 91 } 92 93 #define FAN_FROM_REG(val, div) ((val) == 0 ? -1 : \ 94 ((val) == 255 ? 0 : \ 95 1350000 / ((val) * (div)))) 96 97 /* for temp */ 98 #define TEMP_TO_REG(val) (clamp_val(((val) < 0 ? (val) + 0x100 * 1000 \ 99 : (val)) / 1000, 0, 0xff)) 100 #define TEMP_FROM_REG(val) (((val) & 0x80 ? \ 101 (val) - 0x100 : (val)) * 1000) 102 103 /* 104 * The analog voltage inputs have 8mV LSB. Since the sysfs output is 105 * in mV as would be measured on the chip input pin, need to just 106 * multiply/divide by 8 to translate from/to register values. 107 */ 108 #define IN_TO_REG(val) (clamp_val((((val) + 4) / 8), 0, 255)) 109 #define IN_FROM_REG(val) ((val) * 8) 110 111 #define DIV_FROM_REG(val) (1 << (val)) 112 113 static inline u8 114 DIV_TO_REG(long val) 115 { 116 int i; 117 val = clamp_val(val, 1, 128) >> 1; 118 for (i = 0; i < 7; i++) { 119 if (val == 0) 120 break; 121 val >>= 1; 122 } 123 return (u8)i; 124 } 125 126 struct w83l786ng_data { 127 struct i2c_client *client; 128 struct mutex update_lock; 129 char valid; /* !=0 if following fields are valid */ 130 unsigned long last_updated; /* In jiffies */ 131 unsigned long last_nonvolatile; /* In jiffies, last time we update the 132 * nonvolatile registers */ 133 134 u8 in[3]; 135 u8 in_max[3]; 136 u8 in_min[3]; 137 u8 fan[2]; 138 u8 fan_div[2]; 139 u8 fan_min[2]; 140 u8 temp_type[2]; 141 u8 temp[2][3]; 142 u8 pwm[2]; 143 u8 pwm_mode[2]; /* 0->DC variable voltage 144 * 1->PWM variable duty cycle */ 145 146 u8 pwm_enable[2]; /* 1->manual 147 * 2->thermal cruise (also called SmartFan I) */ 148 u8 tolerance[2]; 149 }; 150 151 static u8 152 w83l786ng_read_value(struct i2c_client *client, u8 reg) 153 { 154 return i2c_smbus_read_byte_data(client, reg); 155 } 156 157 static int 158 w83l786ng_write_value(struct i2c_client *client, u8 reg, u8 value) 159 { 160 return i2c_smbus_write_byte_data(client, reg, value); 161 } 162 163 static struct w83l786ng_data *w83l786ng_update_device(struct device *dev) 164 { 165 struct w83l786ng_data *data = dev_get_drvdata(dev); 166 struct i2c_client *client = data->client; 167 int i, j; 168 u8 reg_tmp, pwmcfg; 169 170 mutex_lock(&data->update_lock); 171 if (time_after(jiffies, data->last_updated + HZ + HZ / 2) 172 || !data->valid) { 173 dev_dbg(&client->dev, "Updating w83l786ng data.\n"); 174 175 /* Update the voltages measured value and limits */ 176 for (i = 0; i < 3; i++) { 177 data->in[i] = w83l786ng_read_value(client, 178 W83L786NG_REG_IN(i)); 179 data->in_min[i] = w83l786ng_read_value(client, 180 W83L786NG_REG_IN_MIN(i)); 181 data->in_max[i] = w83l786ng_read_value(client, 182 W83L786NG_REG_IN_MAX(i)); 183 } 184 185 /* Update the fan counts and limits */ 186 for (i = 0; i < 2; i++) { 187 data->fan[i] = w83l786ng_read_value(client, 188 W83L786NG_REG_FAN(i)); 189 data->fan_min[i] = w83l786ng_read_value(client, 190 W83L786NG_REG_FAN_MIN(i)); 191 } 192 193 /* Update the fan divisor */ 194 reg_tmp = w83l786ng_read_value(client, W83L786NG_REG_FAN_DIV); 195 data->fan_div[0] = reg_tmp & 0x07; 196 data->fan_div[1] = (reg_tmp >> 4) & 0x07; 197 198 pwmcfg = w83l786ng_read_value(client, W83L786NG_REG_FAN_CFG); 199 for (i = 0; i < 2; i++) { 200 data->pwm_mode[i] = 201 ((pwmcfg >> W83L786NG_PWM_MODE_SHIFT[i]) & 1) 202 ? 0 : 1; 203 data->pwm_enable[i] = 204 ((pwmcfg >> W83L786NG_PWM_ENABLE_SHIFT[i]) & 3) + 1; 205 data->pwm[i] = 206 (w83l786ng_read_value(client, W83L786NG_REG_PWM[i]) 207 & 0x0f) * 0x11; 208 } 209 210 211 /* Update the temperature sensors */ 212 for (i = 0; i < 2; i++) { 213 for (j = 0; j < 3; j++) { 214 data->temp[i][j] = w83l786ng_read_value(client, 215 W83L786NG_REG_TEMP[i][j]); 216 } 217 } 218 219 /* Update Smart Fan I/II tolerance */ 220 reg_tmp = w83l786ng_read_value(client, W83L786NG_REG_TOLERANCE); 221 data->tolerance[0] = reg_tmp & 0x0f; 222 data->tolerance[1] = (reg_tmp >> 4) & 0x0f; 223 224 data->last_updated = jiffies; 225 data->valid = 1; 226 227 } 228 229 mutex_unlock(&data->update_lock); 230 231 return data; 232 } 233 234 /* following are the sysfs callback functions */ 235 #define show_in_reg(reg) \ 236 static ssize_t \ 237 show_##reg(struct device *dev, struct device_attribute *attr, \ 238 char *buf) \ 239 { \ 240 int nr = to_sensor_dev_attr(attr)->index; \ 241 struct w83l786ng_data *data = w83l786ng_update_device(dev); \ 242 return sprintf(buf, "%d\n", IN_FROM_REG(data->reg[nr])); \ 243 } 244 245 show_in_reg(in) 246 show_in_reg(in_min) 247 show_in_reg(in_max) 248 249 #define store_in_reg(REG, reg) \ 250 static ssize_t \ 251 store_in_##reg(struct device *dev, struct device_attribute *attr, \ 252 const char *buf, size_t count) \ 253 { \ 254 int nr = to_sensor_dev_attr(attr)->index; \ 255 struct w83l786ng_data *data = dev_get_drvdata(dev); \ 256 struct i2c_client *client = data->client; \ 257 unsigned long val; \ 258 int err = kstrtoul(buf, 10, &val); \ 259 if (err) \ 260 return err; \ 261 mutex_lock(&data->update_lock); \ 262 data->in_##reg[nr] = IN_TO_REG(val); \ 263 w83l786ng_write_value(client, W83L786NG_REG_IN_##REG(nr), \ 264 data->in_##reg[nr]); \ 265 mutex_unlock(&data->update_lock); \ 266 return count; \ 267 } 268 269 store_in_reg(MIN, min) 270 store_in_reg(MAX, max) 271 272 static struct sensor_device_attribute sda_in_input[] = { 273 SENSOR_ATTR(in0_input, S_IRUGO, show_in, NULL, 0), 274 SENSOR_ATTR(in1_input, S_IRUGO, show_in, NULL, 1), 275 SENSOR_ATTR(in2_input, S_IRUGO, show_in, NULL, 2), 276 }; 277 278 static struct sensor_device_attribute sda_in_min[] = { 279 SENSOR_ATTR(in0_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 0), 280 SENSOR_ATTR(in1_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 1), 281 SENSOR_ATTR(in2_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 2), 282 }; 283 284 static struct sensor_device_attribute sda_in_max[] = { 285 SENSOR_ATTR(in0_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 0), 286 SENSOR_ATTR(in1_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 1), 287 SENSOR_ATTR(in2_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 2), 288 }; 289 290 #define show_fan_reg(reg) \ 291 static ssize_t show_##reg(struct device *dev, struct device_attribute *attr, \ 292 char *buf) \ 293 { \ 294 int nr = to_sensor_dev_attr(attr)->index; \ 295 struct w83l786ng_data *data = w83l786ng_update_device(dev); \ 296 return sprintf(buf, "%d\n", \ 297 FAN_FROM_REG(data->reg[nr], DIV_FROM_REG(data->fan_div[nr]))); \ 298 } 299 300 show_fan_reg(fan); 301 show_fan_reg(fan_min); 302 303 static ssize_t 304 store_fan_min(struct device *dev, struct device_attribute *attr, 305 const char *buf, size_t count) 306 { 307 int nr = to_sensor_dev_attr(attr)->index; 308 struct w83l786ng_data *data = dev_get_drvdata(dev); 309 struct i2c_client *client = data->client; 310 unsigned long val; 311 int err; 312 313 err = kstrtoul(buf, 10, &val); 314 if (err) 315 return err; 316 317 mutex_lock(&data->update_lock); 318 data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr])); 319 w83l786ng_write_value(client, W83L786NG_REG_FAN_MIN(nr), 320 data->fan_min[nr]); 321 mutex_unlock(&data->update_lock); 322 323 return count; 324 } 325 326 static ssize_t 327 show_fan_div(struct device *dev, struct device_attribute *attr, 328 char *buf) 329 { 330 int nr = to_sensor_dev_attr(attr)->index; 331 struct w83l786ng_data *data = w83l786ng_update_device(dev); 332 return sprintf(buf, "%u\n", DIV_FROM_REG(data->fan_div[nr])); 333 } 334 335 /* 336 * Note: we save and restore the fan minimum here, because its value is 337 * determined in part by the fan divisor. This follows the principle of 338 * least surprise; the user doesn't expect the fan minimum to change just 339 * because the divisor changed. 340 */ 341 static ssize_t 342 store_fan_div(struct device *dev, struct device_attribute *attr, 343 const char *buf, size_t count) 344 { 345 int nr = to_sensor_dev_attr(attr)->index; 346 struct w83l786ng_data *data = dev_get_drvdata(dev); 347 struct i2c_client *client = data->client; 348 349 unsigned long min; 350 u8 tmp_fan_div; 351 u8 fan_div_reg; 352 u8 keep_mask = 0; 353 u8 new_shift = 0; 354 355 unsigned long val; 356 int err; 357 358 err = kstrtoul(buf, 10, &val); 359 if (err) 360 return err; 361 362 /* Save fan_min */ 363 mutex_lock(&data->update_lock); 364 min = FAN_FROM_REG(data->fan_min[nr], DIV_FROM_REG(data->fan_div[nr])); 365 366 data->fan_div[nr] = DIV_TO_REG(val); 367 368 switch (nr) { 369 case 0: 370 keep_mask = 0xf8; 371 new_shift = 0; 372 break; 373 case 1: 374 keep_mask = 0x8f; 375 new_shift = 4; 376 break; 377 } 378 379 fan_div_reg = w83l786ng_read_value(client, W83L786NG_REG_FAN_DIV) 380 & keep_mask; 381 382 tmp_fan_div = (data->fan_div[nr] << new_shift) & ~keep_mask; 383 384 w83l786ng_write_value(client, W83L786NG_REG_FAN_DIV, 385 fan_div_reg | tmp_fan_div); 386 387 /* Restore fan_min */ 388 data->fan_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr])); 389 w83l786ng_write_value(client, W83L786NG_REG_FAN_MIN(nr), 390 data->fan_min[nr]); 391 mutex_unlock(&data->update_lock); 392 393 return count; 394 } 395 396 static struct sensor_device_attribute sda_fan_input[] = { 397 SENSOR_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0), 398 SENSOR_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1), 399 }; 400 401 static struct sensor_device_attribute sda_fan_min[] = { 402 SENSOR_ATTR(fan1_min, S_IWUSR | S_IRUGO, show_fan_min, 403 store_fan_min, 0), 404 SENSOR_ATTR(fan2_min, S_IWUSR | S_IRUGO, show_fan_min, 405 store_fan_min, 1), 406 }; 407 408 static struct sensor_device_attribute sda_fan_div[] = { 409 SENSOR_ATTR(fan1_div, S_IWUSR | S_IRUGO, show_fan_div, 410 store_fan_div, 0), 411 SENSOR_ATTR(fan2_div, S_IWUSR | S_IRUGO, show_fan_div, 412 store_fan_div, 1), 413 }; 414 415 416 /* read/write the temperature, includes measured value and limits */ 417 418 static ssize_t 419 show_temp(struct device *dev, struct device_attribute *attr, char *buf) 420 { 421 struct sensor_device_attribute_2 *sensor_attr = 422 to_sensor_dev_attr_2(attr); 423 int nr = sensor_attr->nr; 424 int index = sensor_attr->index; 425 struct w83l786ng_data *data = w83l786ng_update_device(dev); 426 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr][index])); 427 } 428 429 static ssize_t 430 store_temp(struct device *dev, struct device_attribute *attr, 431 const char *buf, size_t count) 432 { 433 struct sensor_device_attribute_2 *sensor_attr = 434 to_sensor_dev_attr_2(attr); 435 int nr = sensor_attr->nr; 436 int index = sensor_attr->index; 437 struct w83l786ng_data *data = dev_get_drvdata(dev); 438 struct i2c_client *client = data->client; 439 long val; 440 int err; 441 442 err = kstrtol(buf, 10, &val); 443 if (err) 444 return err; 445 446 mutex_lock(&data->update_lock); 447 data->temp[nr][index] = TEMP_TO_REG(val); 448 w83l786ng_write_value(client, W83L786NG_REG_TEMP[nr][index], 449 data->temp[nr][index]); 450 mutex_unlock(&data->update_lock); 451 452 return count; 453 } 454 455 static struct sensor_device_attribute_2 sda_temp_input[] = { 456 SENSOR_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0, 0), 457 SENSOR_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 1, 0), 458 }; 459 460 static struct sensor_device_attribute_2 sda_temp_max[] = { 461 SENSOR_ATTR_2(temp1_max, S_IRUGO | S_IWUSR, 462 show_temp, store_temp, 0, 1), 463 SENSOR_ATTR_2(temp2_max, S_IRUGO | S_IWUSR, 464 show_temp, store_temp, 1, 1), 465 }; 466 467 static struct sensor_device_attribute_2 sda_temp_max_hyst[] = { 468 SENSOR_ATTR_2(temp1_max_hyst, S_IRUGO | S_IWUSR, 469 show_temp, store_temp, 0, 2), 470 SENSOR_ATTR_2(temp2_max_hyst, S_IRUGO | S_IWUSR, 471 show_temp, store_temp, 1, 2), 472 }; 473 474 #define show_pwm_reg(reg) \ 475 static ssize_t show_##reg(struct device *dev, struct device_attribute *attr, \ 476 char *buf) \ 477 { \ 478 struct w83l786ng_data *data = w83l786ng_update_device(dev); \ 479 int nr = to_sensor_dev_attr(attr)->index; \ 480 return sprintf(buf, "%d\n", data->reg[nr]); \ 481 } 482 483 show_pwm_reg(pwm_mode) 484 show_pwm_reg(pwm_enable) 485 show_pwm_reg(pwm) 486 487 static ssize_t 488 store_pwm_mode(struct device *dev, struct device_attribute *attr, 489 const char *buf, size_t count) 490 { 491 int nr = to_sensor_dev_attr(attr)->index; 492 struct w83l786ng_data *data = dev_get_drvdata(dev); 493 struct i2c_client *client = data->client; 494 u8 reg; 495 unsigned long val; 496 int err; 497 498 err = kstrtoul(buf, 10, &val); 499 if (err) 500 return err; 501 502 if (val > 1) 503 return -EINVAL; 504 mutex_lock(&data->update_lock); 505 data->pwm_mode[nr] = val; 506 reg = w83l786ng_read_value(client, W83L786NG_REG_FAN_CFG); 507 reg &= ~(1 << W83L786NG_PWM_MODE_SHIFT[nr]); 508 if (!val) 509 reg |= 1 << W83L786NG_PWM_MODE_SHIFT[nr]; 510 w83l786ng_write_value(client, W83L786NG_REG_FAN_CFG, reg); 511 mutex_unlock(&data->update_lock); 512 return count; 513 } 514 515 static ssize_t 516 store_pwm(struct device *dev, struct device_attribute *attr, 517 const char *buf, size_t count) 518 { 519 int nr = to_sensor_dev_attr(attr)->index; 520 struct w83l786ng_data *data = dev_get_drvdata(dev); 521 struct i2c_client *client = data->client; 522 unsigned long val; 523 int err; 524 525 err = kstrtoul(buf, 10, &val); 526 if (err) 527 return err; 528 val = clamp_val(val, 0, 255); 529 val = DIV_ROUND_CLOSEST(val, 0x11); 530 531 mutex_lock(&data->update_lock); 532 data->pwm[nr] = val * 0x11; 533 val |= w83l786ng_read_value(client, W83L786NG_REG_PWM[nr]) & 0xf0; 534 w83l786ng_write_value(client, W83L786NG_REG_PWM[nr], val); 535 mutex_unlock(&data->update_lock); 536 return count; 537 } 538 539 static ssize_t 540 store_pwm_enable(struct device *dev, struct device_attribute *attr, 541 const char *buf, size_t count) 542 { 543 int nr = to_sensor_dev_attr(attr)->index; 544 struct w83l786ng_data *data = dev_get_drvdata(dev); 545 struct i2c_client *client = data->client; 546 u8 reg; 547 unsigned long val; 548 int err; 549 550 err = kstrtoul(buf, 10, &val); 551 if (err) 552 return err; 553 554 if (!val || val > 2) /* only modes 1 and 2 are supported */ 555 return -EINVAL; 556 557 mutex_lock(&data->update_lock); 558 reg = w83l786ng_read_value(client, W83L786NG_REG_FAN_CFG); 559 data->pwm_enable[nr] = val; 560 reg &= ~(0x03 << W83L786NG_PWM_ENABLE_SHIFT[nr]); 561 reg |= (val - 1) << W83L786NG_PWM_ENABLE_SHIFT[nr]; 562 w83l786ng_write_value(client, W83L786NG_REG_FAN_CFG, reg); 563 mutex_unlock(&data->update_lock); 564 return count; 565 } 566 567 static struct sensor_device_attribute sda_pwm[] = { 568 SENSOR_ATTR(pwm1, S_IWUSR | S_IRUGO, show_pwm, store_pwm, 0), 569 SENSOR_ATTR(pwm2, S_IWUSR | S_IRUGO, show_pwm, store_pwm, 1), 570 }; 571 572 static struct sensor_device_attribute sda_pwm_mode[] = { 573 SENSOR_ATTR(pwm1_mode, S_IWUSR | S_IRUGO, show_pwm_mode, 574 store_pwm_mode, 0), 575 SENSOR_ATTR(pwm2_mode, S_IWUSR | S_IRUGO, show_pwm_mode, 576 store_pwm_mode, 1), 577 }; 578 579 static struct sensor_device_attribute sda_pwm_enable[] = { 580 SENSOR_ATTR(pwm1_enable, S_IWUSR | S_IRUGO, show_pwm_enable, 581 store_pwm_enable, 0), 582 SENSOR_ATTR(pwm2_enable, S_IWUSR | S_IRUGO, show_pwm_enable, 583 store_pwm_enable, 1), 584 }; 585 586 /* For Smart Fan I/Thermal Cruise and Smart Fan II */ 587 static ssize_t 588 show_tolerance(struct device *dev, struct device_attribute *attr, char *buf) 589 { 590 int nr = to_sensor_dev_attr(attr)->index; 591 struct w83l786ng_data *data = w83l786ng_update_device(dev); 592 return sprintf(buf, "%ld\n", (long)data->tolerance[nr]); 593 } 594 595 static ssize_t 596 store_tolerance(struct device *dev, struct device_attribute *attr, 597 const char *buf, size_t count) 598 { 599 int nr = to_sensor_dev_attr(attr)->index; 600 struct w83l786ng_data *data = dev_get_drvdata(dev); 601 struct i2c_client *client = data->client; 602 u8 tol_tmp, tol_mask; 603 unsigned long val; 604 int err; 605 606 err = kstrtoul(buf, 10, &val); 607 if (err) 608 return err; 609 610 mutex_lock(&data->update_lock); 611 tol_mask = w83l786ng_read_value(client, 612 W83L786NG_REG_TOLERANCE) & ((nr == 1) ? 0x0f : 0xf0); 613 tol_tmp = clamp_val(val, 0, 15); 614 tol_tmp &= 0x0f; 615 data->tolerance[nr] = tol_tmp; 616 if (nr == 1) 617 tol_tmp <<= 4; 618 619 w83l786ng_write_value(client, W83L786NG_REG_TOLERANCE, 620 tol_mask | tol_tmp); 621 mutex_unlock(&data->update_lock); 622 return count; 623 } 624 625 static struct sensor_device_attribute sda_tolerance[] = { 626 SENSOR_ATTR(pwm1_tolerance, S_IWUSR | S_IRUGO, 627 show_tolerance, store_tolerance, 0), 628 SENSOR_ATTR(pwm2_tolerance, S_IWUSR | S_IRUGO, 629 show_tolerance, store_tolerance, 1), 630 }; 631 632 633 #define IN_UNIT_ATTRS(X) \ 634 &sda_in_input[X].dev_attr.attr, \ 635 &sda_in_min[X].dev_attr.attr, \ 636 &sda_in_max[X].dev_attr.attr 637 638 #define FAN_UNIT_ATTRS(X) \ 639 &sda_fan_input[X].dev_attr.attr, \ 640 &sda_fan_min[X].dev_attr.attr, \ 641 &sda_fan_div[X].dev_attr.attr 642 643 #define TEMP_UNIT_ATTRS(X) \ 644 &sda_temp_input[X].dev_attr.attr, \ 645 &sda_temp_max[X].dev_attr.attr, \ 646 &sda_temp_max_hyst[X].dev_attr.attr 647 648 #define PWM_UNIT_ATTRS(X) \ 649 &sda_pwm[X].dev_attr.attr, \ 650 &sda_pwm_mode[X].dev_attr.attr, \ 651 &sda_pwm_enable[X].dev_attr.attr 652 653 #define TOLERANCE_UNIT_ATTRS(X) \ 654 &sda_tolerance[X].dev_attr.attr 655 656 static struct attribute *w83l786ng_attrs[] = { 657 IN_UNIT_ATTRS(0), 658 IN_UNIT_ATTRS(1), 659 IN_UNIT_ATTRS(2), 660 FAN_UNIT_ATTRS(0), 661 FAN_UNIT_ATTRS(1), 662 TEMP_UNIT_ATTRS(0), 663 TEMP_UNIT_ATTRS(1), 664 PWM_UNIT_ATTRS(0), 665 PWM_UNIT_ATTRS(1), 666 TOLERANCE_UNIT_ATTRS(0), 667 TOLERANCE_UNIT_ATTRS(1), 668 NULL 669 }; 670 671 ATTRIBUTE_GROUPS(w83l786ng); 672 673 static int 674 w83l786ng_detect(struct i2c_client *client, struct i2c_board_info *info) 675 { 676 struct i2c_adapter *adapter = client->adapter; 677 u16 man_id; 678 u8 chip_id; 679 680 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA)) 681 return -ENODEV; 682 683 /* Detection */ 684 if ((w83l786ng_read_value(client, W83L786NG_REG_CONFIG) & 0x80)) { 685 dev_dbg(&adapter->dev, "W83L786NG detection failed at 0x%02x\n", 686 client->addr); 687 return -ENODEV; 688 } 689 690 /* Identification */ 691 man_id = (w83l786ng_read_value(client, W83L786NG_REG_MAN_ID1) << 8) + 692 w83l786ng_read_value(client, W83L786NG_REG_MAN_ID2); 693 chip_id = w83l786ng_read_value(client, W83L786NG_REG_CHIP_ID); 694 695 if (man_id != 0x5CA3 || /* Winbond */ 696 chip_id != 0x80) { /* W83L786NG */ 697 dev_dbg(&adapter->dev, 698 "Unsupported chip (man_id=0x%04X, chip_id=0x%02X)\n", 699 man_id, chip_id); 700 return -ENODEV; 701 } 702 703 strlcpy(info->type, "w83l786ng", I2C_NAME_SIZE); 704 705 return 0; 706 } 707 708 static void w83l786ng_init_client(struct i2c_client *client) 709 { 710 u8 tmp; 711 712 if (reset) 713 w83l786ng_write_value(client, W83L786NG_REG_CONFIG, 0x80); 714 715 /* Start monitoring */ 716 tmp = w83l786ng_read_value(client, W83L786NG_REG_CONFIG); 717 if (!(tmp & 0x01)) 718 w83l786ng_write_value(client, W83L786NG_REG_CONFIG, tmp | 0x01); 719 } 720 721 static int 722 w83l786ng_probe(struct i2c_client *client, const struct i2c_device_id *id) 723 { 724 struct device *dev = &client->dev; 725 struct w83l786ng_data *data; 726 struct device *hwmon_dev; 727 int i; 728 u8 reg_tmp; 729 730 data = devm_kzalloc(dev, sizeof(struct w83l786ng_data), GFP_KERNEL); 731 if (!data) 732 return -ENOMEM; 733 734 data->client = client; 735 mutex_init(&data->update_lock); 736 737 /* Initialize the chip */ 738 w83l786ng_init_client(client); 739 740 /* A few vars need to be filled upon startup */ 741 for (i = 0; i < 2; i++) { 742 data->fan_min[i] = w83l786ng_read_value(client, 743 W83L786NG_REG_FAN_MIN(i)); 744 } 745 746 /* Update the fan divisor */ 747 reg_tmp = w83l786ng_read_value(client, W83L786NG_REG_FAN_DIV); 748 data->fan_div[0] = reg_tmp & 0x07; 749 data->fan_div[1] = (reg_tmp >> 4) & 0x07; 750 751 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name, 752 data, 753 w83l786ng_groups); 754 return PTR_ERR_OR_ZERO(hwmon_dev); 755 } 756 757 static const struct i2c_device_id w83l786ng_id[] = { 758 { "w83l786ng", 0 }, 759 { } 760 }; 761 MODULE_DEVICE_TABLE(i2c, w83l786ng_id); 762 763 static struct i2c_driver w83l786ng_driver = { 764 .class = I2C_CLASS_HWMON, 765 .driver = { 766 .name = "w83l786ng", 767 }, 768 .probe = w83l786ng_probe, 769 .id_table = w83l786ng_id, 770 .detect = w83l786ng_detect, 771 .address_list = normal_i2c, 772 }; 773 774 module_i2c_driver(w83l786ng_driver); 775 776 MODULE_AUTHOR("Kevin Lo"); 777 MODULE_DESCRIPTION("w83l786ng driver"); 778 MODULE_LICENSE("GPL"); 779