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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * w83l786ng.c - Linux kernel driver for hardware monitoring4 * Copyright (c) 2007 Kevin Lo <kevlo@kevlo.org>5 */6 7/*8 * Supports following chips:9 *10 * Chip #vin #fanin #pwm #temp wchipid vendid i2c ISA11 * w83l786ng 3 2 2 2 0x7b 0x5ca3 yes no12 */13 14#include <linux/module.h>15#include <linux/init.h>16#include <linux/slab.h>17#include <linux/i2c.h>18#include <linux/hwmon.h>19#include <linux/hwmon-sysfs.h>20#include <linux/err.h>21#include <linux/mutex.h>22#include <linux/jiffies.h>23 24/* Addresses to scan */25static const unsigned short normal_i2c[] = { 0x2e, 0x2f, I2C_CLIENT_END };26 27/* Insmod parameters */28 29static bool reset;30module_param(reset, bool, 0);31MODULE_PARM_DESC(reset, "Set to 1 to reset chip, not recommended");32 33#define W83L786NG_REG_IN_MIN(nr) (0x2C + (nr) * 2)34#define W83L786NG_REG_IN_MAX(nr) (0x2B + (nr) * 2)35#define W83L786NG_REG_IN(nr) ((nr) + 0x20)36 37#define W83L786NG_REG_FAN(nr) ((nr) + 0x28)38#define W83L786NG_REG_FAN_MIN(nr) ((nr) + 0x3B)39 40#define W83L786NG_REG_CONFIG 0x4041#define W83L786NG_REG_ALARM1 0x4142#define W83L786NG_REG_ALARM2 0x4243#define W83L786NG_REG_GPIO_EN 0x4744#define W83L786NG_REG_MAN_ID2 0x4C45#define W83L786NG_REG_MAN_ID1 0x4D46#define W83L786NG_REG_CHIP_ID 0x4E47 48#define W83L786NG_REG_DIODE 0x5349#define W83L786NG_REG_FAN_DIV 0x5450#define W83L786NG_REG_FAN_CFG 0x8051 52#define W83L786NG_REG_TOLERANCE 0x8D53 54static const u8 W83L786NG_REG_TEMP[2][3] = {55 { 0x25, /* TEMP 0 in DataSheet */56 0x35, /* TEMP 0 Over in DataSheet */57 0x36 }, /* TEMP 0 Hyst in DataSheet */58 { 0x26, /* TEMP 1 in DataSheet */59 0x37, /* TEMP 1 Over in DataSheet */60 0x38 } /* TEMP 1 Hyst in DataSheet */61};62 63static const u8 W83L786NG_PWM_MODE_SHIFT[] = {6, 7};64static const u8 W83L786NG_PWM_ENABLE_SHIFT[] = {2, 4};65 66/* FAN Duty Cycle, be used to control */67static const u8 W83L786NG_REG_PWM[] = {0x81, 0x87};68 69 70static inline u871FAN_TO_REG(long rpm, int div)72{73 if (rpm == 0)74 return 255;75 rpm = clamp_val(rpm, 1, 1000000);76 return clamp_val((1350000 + rpm * div / 2) / (rpm * div), 1, 254);77}78 79#define FAN_FROM_REG(val, div) ((val) == 0 ? -1 : \80 ((val) == 255 ? 0 : \81 1350000 / ((val) * (div))))82 83/* for temp */84#define TEMP_TO_REG(val) (clamp_val(((val) < 0 ? (val) + 0x100 * 1000 \85 : (val)) / 1000, 0, 0xff))86#define TEMP_FROM_REG(val) (((val) & 0x80 ? \87 (val) - 0x100 : (val)) * 1000)88 89/*90 * The analog voltage inputs have 8mV LSB. Since the sysfs output is91 * in mV as would be measured on the chip input pin, need to just92 * multiply/divide by 8 to translate from/to register values.93 */94#define IN_TO_REG(val) (clamp_val((((val) + 4) / 8), 0, 255))95#define IN_FROM_REG(val) ((val) * 8)96 97#define DIV_FROM_REG(val) (1 << (val))98 99static inline u8100DIV_TO_REG(long val)101{102 int i;103 val = clamp_val(val, 1, 128) >> 1;104 for (i = 0; i < 7; i++) {105 if (val == 0)106 break;107 val >>= 1;108 }109 return (u8)i;110}111 112struct w83l786ng_data {113 struct i2c_client *client;114 struct mutex update_lock;115 bool valid; /* true if following fields are valid */116 unsigned long last_updated; /* In jiffies */117 unsigned long last_nonvolatile; /* In jiffies, last time we update the118 * nonvolatile registers */119 120 u8 in[3];121 u8 in_max[3];122 u8 in_min[3];123 u8 fan[2];124 u8 fan_div[2];125 u8 fan_min[2];126 u8 temp_type[2];127 u8 temp[2][3];128 u8 pwm[2];129 u8 pwm_mode[2]; /* 0->DC variable voltage130 * 1->PWM variable duty cycle */131 132 u8 pwm_enable[2]; /* 1->manual133 * 2->thermal cruise (also called SmartFan I) */134 u8 tolerance[2];135};136 137static u8138w83l786ng_read_value(struct i2c_client *client, u8 reg)139{140 return i2c_smbus_read_byte_data(client, reg);141}142 143static int144w83l786ng_write_value(struct i2c_client *client, u8 reg, u8 value)145{146 return i2c_smbus_write_byte_data(client, reg, value);147}148 149static struct w83l786ng_data *w83l786ng_update_device(struct device *dev)150{151 struct w83l786ng_data *data = dev_get_drvdata(dev);152 struct i2c_client *client = data->client;153 int i, j;154 u8 reg_tmp, pwmcfg;155 156 mutex_lock(&data->update_lock);157 if (time_after(jiffies, data->last_updated + HZ + HZ / 2)158 || !data->valid) {159 dev_dbg(&client->dev, "Updating w83l786ng data.\n");160 161 /* Update the voltages measured value and limits */162 for (i = 0; i < 3; i++) {163 data->in[i] = w83l786ng_read_value(client,164 W83L786NG_REG_IN(i));165 data->in_min[i] = w83l786ng_read_value(client,166 W83L786NG_REG_IN_MIN(i));167 data->in_max[i] = w83l786ng_read_value(client,168 W83L786NG_REG_IN_MAX(i));169 }170 171 /* Update the fan counts and limits */172 for (i = 0; i < 2; i++) {173 data->fan[i] = w83l786ng_read_value(client,174 W83L786NG_REG_FAN(i));175 data->fan_min[i] = w83l786ng_read_value(client,176 W83L786NG_REG_FAN_MIN(i));177 }178 179 /* Update the fan divisor */180 reg_tmp = w83l786ng_read_value(client, W83L786NG_REG_FAN_DIV);181 data->fan_div[0] = reg_tmp & 0x07;182 data->fan_div[1] = (reg_tmp >> 4) & 0x07;183 184 pwmcfg = w83l786ng_read_value(client, W83L786NG_REG_FAN_CFG);185 for (i = 0; i < 2; i++) {186 data->pwm_mode[i] =187 ((pwmcfg >> W83L786NG_PWM_MODE_SHIFT[i]) & 1)188 ? 0 : 1;189 data->pwm_enable[i] =190 ((pwmcfg >> W83L786NG_PWM_ENABLE_SHIFT[i]) & 3) + 1;191 data->pwm[i] =192 (w83l786ng_read_value(client, W83L786NG_REG_PWM[i])193 & 0x0f) * 0x11;194 }195 196 197 /* Update the temperature sensors */198 for (i = 0; i < 2; i++) {199 for (j = 0; j < 3; j++) {200 data->temp[i][j] = w83l786ng_read_value(client,201 W83L786NG_REG_TEMP[i][j]);202 }203 }204 205 /* Update Smart Fan I/II tolerance */206 reg_tmp = w83l786ng_read_value(client, W83L786NG_REG_TOLERANCE);207 data->tolerance[0] = reg_tmp & 0x0f;208 data->tolerance[1] = (reg_tmp >> 4) & 0x0f;209 210 data->last_updated = jiffies;211 data->valid = true;212 213 }214 215 mutex_unlock(&data->update_lock);216 217 return data;218}219 220/* following are the sysfs callback functions */221#define show_in_reg(reg) \222static ssize_t \223show_##reg(struct device *dev, struct device_attribute *attr, \224 char *buf) \225{ \226 int nr = to_sensor_dev_attr(attr)->index; \227 struct w83l786ng_data *data = w83l786ng_update_device(dev); \228 return sprintf(buf, "%d\n", IN_FROM_REG(data->reg[nr])); \229}230 231show_in_reg(in)232show_in_reg(in_min)233show_in_reg(in_max)234 235#define store_in_reg(REG, reg) \236static ssize_t \237store_in_##reg(struct device *dev, struct device_attribute *attr, \238 const char *buf, size_t count) \239{ \240 int nr = to_sensor_dev_attr(attr)->index; \241 struct w83l786ng_data *data = dev_get_drvdata(dev); \242 struct i2c_client *client = data->client; \243 unsigned long val; \244 int err = kstrtoul(buf, 10, &val); \245 if (err) \246 return err; \247 mutex_lock(&data->update_lock); \248 data->in_##reg[nr] = IN_TO_REG(val); \249 w83l786ng_write_value(client, W83L786NG_REG_IN_##REG(nr), \250 data->in_##reg[nr]); \251 mutex_unlock(&data->update_lock); \252 return count; \253}254 255store_in_reg(MIN, min)256store_in_reg(MAX, max)257 258static struct sensor_device_attribute sda_in_input[] = {259 SENSOR_ATTR(in0_input, S_IRUGO, show_in, NULL, 0),260 SENSOR_ATTR(in1_input, S_IRUGO, show_in, NULL, 1),261 SENSOR_ATTR(in2_input, S_IRUGO, show_in, NULL, 2),262};263 264static struct sensor_device_attribute sda_in_min[] = {265 SENSOR_ATTR(in0_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 0),266 SENSOR_ATTR(in1_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 1),267 SENSOR_ATTR(in2_min, S_IWUSR | S_IRUGO, show_in_min, store_in_min, 2),268};269 270static struct sensor_device_attribute sda_in_max[] = {271 SENSOR_ATTR(in0_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 0),272 SENSOR_ATTR(in1_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 1),273 SENSOR_ATTR(in2_max, S_IWUSR | S_IRUGO, show_in_max, store_in_max, 2),274};275 276#define show_fan_reg(reg) \277static ssize_t show_##reg(struct device *dev, struct device_attribute *attr, \278 char *buf) \279{ \280 int nr = to_sensor_dev_attr(attr)->index; \281 struct w83l786ng_data *data = w83l786ng_update_device(dev); \282 return sprintf(buf, "%d\n", \283 FAN_FROM_REG(data->reg[nr], DIV_FROM_REG(data->fan_div[nr]))); \284}285 286show_fan_reg(fan);287show_fan_reg(fan_min);288 289static ssize_t290store_fan_min(struct device *dev, struct device_attribute *attr,291 const char *buf, size_t count)292{293 int nr = to_sensor_dev_attr(attr)->index;294 struct w83l786ng_data *data = dev_get_drvdata(dev);295 struct i2c_client *client = data->client;296 unsigned long val;297 int err;298 299 err = kstrtoul(buf, 10, &val);300 if (err)301 return err;302 303 mutex_lock(&data->update_lock);304 data->fan_min[nr] = FAN_TO_REG(val, DIV_FROM_REG(data->fan_div[nr]));305 w83l786ng_write_value(client, W83L786NG_REG_FAN_MIN(nr),306 data->fan_min[nr]);307 mutex_unlock(&data->update_lock);308 309 return count;310}311 312static ssize_t313show_fan_div(struct device *dev, struct device_attribute *attr,314 char *buf)315{316 int nr = to_sensor_dev_attr(attr)->index;317 struct w83l786ng_data *data = w83l786ng_update_device(dev);318 return sprintf(buf, "%u\n", DIV_FROM_REG(data->fan_div[nr]));319}320 321/*322 * Note: we save and restore the fan minimum here, because its value is323 * determined in part by the fan divisor. This follows the principle of324 * least surprise; the user doesn't expect the fan minimum to change just325 * because the divisor changed.326 */327static ssize_t328store_fan_div(struct device *dev, struct device_attribute *attr,329 const char *buf, size_t count)330{331 int nr = to_sensor_dev_attr(attr)->index;332 struct w83l786ng_data *data = dev_get_drvdata(dev);333 struct i2c_client *client = data->client;334 335 unsigned long min;336 u8 tmp_fan_div;337 u8 fan_div_reg;338 u8 keep_mask = 0;339 u8 new_shift = 0;340 341 unsigned long val;342 int err;343 344 err = kstrtoul(buf, 10, &val);345 if (err)346 return err;347 348 /* Save fan_min */349 mutex_lock(&data->update_lock);350 min = FAN_FROM_REG(data->fan_min[nr], DIV_FROM_REG(data->fan_div[nr]));351 352 data->fan_div[nr] = DIV_TO_REG(val);353 354 switch (nr) {355 case 0:356 keep_mask = 0xf8;357 new_shift = 0;358 break;359 case 1:360 keep_mask = 0x8f;361 new_shift = 4;362 break;363 }364 365 fan_div_reg = w83l786ng_read_value(client, W83L786NG_REG_FAN_DIV)366 & keep_mask;367 368 tmp_fan_div = (data->fan_div[nr] << new_shift) & ~keep_mask;369 370 w83l786ng_write_value(client, W83L786NG_REG_FAN_DIV,371 fan_div_reg | tmp_fan_div);372 373 /* Restore fan_min */374 data->fan_min[nr] = FAN_TO_REG(min, DIV_FROM_REG(data->fan_div[nr]));375 w83l786ng_write_value(client, W83L786NG_REG_FAN_MIN(nr),376 data->fan_min[nr]);377 mutex_unlock(&data->update_lock);378 379 return count;380}381 382static struct sensor_device_attribute sda_fan_input[] = {383 SENSOR_ATTR(fan1_input, S_IRUGO, show_fan, NULL, 0),384 SENSOR_ATTR(fan2_input, S_IRUGO, show_fan, NULL, 1),385};386 387static struct sensor_device_attribute sda_fan_min[] = {388 SENSOR_ATTR(fan1_min, S_IWUSR | S_IRUGO, show_fan_min,389 store_fan_min, 0),390 SENSOR_ATTR(fan2_min, S_IWUSR | S_IRUGO, show_fan_min,391 store_fan_min, 1),392};393 394static struct sensor_device_attribute sda_fan_div[] = {395 SENSOR_ATTR(fan1_div, S_IWUSR | S_IRUGO, show_fan_div,396 store_fan_div, 0),397 SENSOR_ATTR(fan2_div, S_IWUSR | S_IRUGO, show_fan_div,398 store_fan_div, 1),399};400 401 402/* read/write the temperature, includes measured value and limits */403 404static ssize_t405show_temp(struct device *dev, struct device_attribute *attr, char *buf)406{407 struct sensor_device_attribute_2 *sensor_attr =408 to_sensor_dev_attr_2(attr);409 int nr = sensor_attr->nr;410 int index = sensor_attr->index;411 struct w83l786ng_data *data = w83l786ng_update_device(dev);412 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr][index]));413}414 415static ssize_t416store_temp(struct device *dev, struct device_attribute *attr,417 const char *buf, size_t count)418{419 struct sensor_device_attribute_2 *sensor_attr =420 to_sensor_dev_attr_2(attr);421 int nr = sensor_attr->nr;422 int index = sensor_attr->index;423 struct w83l786ng_data *data = dev_get_drvdata(dev);424 struct i2c_client *client = data->client;425 long val;426 int err;427 428 err = kstrtol(buf, 10, &val);429 if (err)430 return err;431 432 mutex_lock(&data->update_lock);433 data->temp[nr][index] = TEMP_TO_REG(val);434 w83l786ng_write_value(client, W83L786NG_REG_TEMP[nr][index],435 data->temp[nr][index]);436 mutex_unlock(&data->update_lock);437 438 return count;439}440 441static struct sensor_device_attribute_2 sda_temp_input[] = {442 SENSOR_ATTR_2(temp1_input, S_IRUGO, show_temp, NULL, 0, 0),443 SENSOR_ATTR_2(temp2_input, S_IRUGO, show_temp, NULL, 1, 0),444};445 446static struct sensor_device_attribute_2 sda_temp_max[] = {447 SENSOR_ATTR_2(temp1_max, S_IRUGO | S_IWUSR,448 show_temp, store_temp, 0, 1),449 SENSOR_ATTR_2(temp2_max, S_IRUGO | S_IWUSR,450 show_temp, store_temp, 1, 1),451};452 453static struct sensor_device_attribute_2 sda_temp_max_hyst[] = {454 SENSOR_ATTR_2(temp1_max_hyst, S_IRUGO | S_IWUSR,455 show_temp, store_temp, 0, 2),456 SENSOR_ATTR_2(temp2_max_hyst, S_IRUGO | S_IWUSR,457 show_temp, store_temp, 1, 2),458};459 460#define show_pwm_reg(reg) \461static ssize_t show_##reg(struct device *dev, struct device_attribute *attr, \462 char *buf) \463{ \464 struct w83l786ng_data *data = w83l786ng_update_device(dev); \465 int nr = to_sensor_dev_attr(attr)->index; \466 return sprintf(buf, "%d\n", data->reg[nr]); \467}468 469show_pwm_reg(pwm_mode)470show_pwm_reg(pwm_enable)471show_pwm_reg(pwm)472 473static ssize_t474store_pwm_mode(struct device *dev, struct device_attribute *attr,475 const char *buf, size_t count)476{477 int nr = to_sensor_dev_attr(attr)->index;478 struct w83l786ng_data *data = dev_get_drvdata(dev);479 struct i2c_client *client = data->client;480 u8 reg;481 unsigned long val;482 int err;483 484 err = kstrtoul(buf, 10, &val);485 if (err)486 return err;487 488 if (val > 1)489 return -EINVAL;490 mutex_lock(&data->update_lock);491 data->pwm_mode[nr] = val;492 reg = w83l786ng_read_value(client, W83L786NG_REG_FAN_CFG);493 reg &= ~(1 << W83L786NG_PWM_MODE_SHIFT[nr]);494 if (!val)495 reg |= 1 << W83L786NG_PWM_MODE_SHIFT[nr];496 w83l786ng_write_value(client, W83L786NG_REG_FAN_CFG, reg);497 mutex_unlock(&data->update_lock);498 return count;499}500 501static ssize_t502store_pwm(struct device *dev, struct device_attribute *attr,503 const char *buf, size_t count)504{505 int nr = to_sensor_dev_attr(attr)->index;506 struct w83l786ng_data *data = dev_get_drvdata(dev);507 struct i2c_client *client = data->client;508 unsigned long val;509 int err;510 511 err = kstrtoul(buf, 10, &val);512 if (err)513 return err;514 val = clamp_val(val, 0, 255);515 val = DIV_ROUND_CLOSEST(val, 0x11);516 517 mutex_lock(&data->update_lock);518 data->pwm[nr] = val * 0x11;519 val |= w83l786ng_read_value(client, W83L786NG_REG_PWM[nr]) & 0xf0;520 w83l786ng_write_value(client, W83L786NG_REG_PWM[nr], val);521 mutex_unlock(&data->update_lock);522 return count;523}524 525static ssize_t526store_pwm_enable(struct device *dev, struct device_attribute *attr,527 const char *buf, size_t count)528{529 int nr = to_sensor_dev_attr(attr)->index;530 struct w83l786ng_data *data = dev_get_drvdata(dev);531 struct i2c_client *client = data->client;532 u8 reg;533 unsigned long val;534 int err;535 536 err = kstrtoul(buf, 10, &val);537 if (err)538 return err;539 540 if (!val || val > 2) /* only modes 1 and 2 are supported */541 return -EINVAL;542 543 mutex_lock(&data->update_lock);544 reg = w83l786ng_read_value(client, W83L786NG_REG_FAN_CFG);545 data->pwm_enable[nr] = val;546 reg &= ~(0x03 << W83L786NG_PWM_ENABLE_SHIFT[nr]);547 reg |= (val - 1) << W83L786NG_PWM_ENABLE_SHIFT[nr];548 w83l786ng_write_value(client, W83L786NG_REG_FAN_CFG, reg);549 mutex_unlock(&data->update_lock);550 return count;551}552 553static struct sensor_device_attribute sda_pwm[] = {554 SENSOR_ATTR(pwm1, S_IWUSR | S_IRUGO, show_pwm, store_pwm, 0),555 SENSOR_ATTR(pwm2, S_IWUSR | S_IRUGO, show_pwm, store_pwm, 1),556};557 558static struct sensor_device_attribute sda_pwm_mode[] = {559 SENSOR_ATTR(pwm1_mode, S_IWUSR | S_IRUGO, show_pwm_mode,560 store_pwm_mode, 0),561 SENSOR_ATTR(pwm2_mode, S_IWUSR | S_IRUGO, show_pwm_mode,562 store_pwm_mode, 1),563};564 565static struct sensor_device_attribute sda_pwm_enable[] = {566 SENSOR_ATTR(pwm1_enable, S_IWUSR | S_IRUGO, show_pwm_enable,567 store_pwm_enable, 0),568 SENSOR_ATTR(pwm2_enable, S_IWUSR | S_IRUGO, show_pwm_enable,569 store_pwm_enable, 1),570};571 572/* For Smart Fan I/Thermal Cruise and Smart Fan II */573static ssize_t574show_tolerance(struct device *dev, struct device_attribute *attr, char *buf)575{576 int nr = to_sensor_dev_attr(attr)->index;577 struct w83l786ng_data *data = w83l786ng_update_device(dev);578 return sprintf(buf, "%ld\n", (long)data->tolerance[nr]);579}580 581static ssize_t582store_tolerance(struct device *dev, struct device_attribute *attr,583 const char *buf, size_t count)584{585 int nr = to_sensor_dev_attr(attr)->index;586 struct w83l786ng_data *data = dev_get_drvdata(dev);587 struct i2c_client *client = data->client;588 u8 tol_tmp, tol_mask;589 unsigned long val;590 int err;591 592 err = kstrtoul(buf, 10, &val);593 if (err)594 return err;595 596 mutex_lock(&data->update_lock);597 tol_mask = w83l786ng_read_value(client,598 W83L786NG_REG_TOLERANCE) & ((nr == 1) ? 0x0f : 0xf0);599 tol_tmp = clamp_val(val, 0, 15);600 tol_tmp &= 0x0f;601 data->tolerance[nr] = tol_tmp;602 if (nr == 1)603 tol_tmp <<= 4;604 605 w83l786ng_write_value(client, W83L786NG_REG_TOLERANCE,606 tol_mask | tol_tmp);607 mutex_unlock(&data->update_lock);608 return count;609}610 611static struct sensor_device_attribute sda_tolerance[] = {612 SENSOR_ATTR(pwm1_tolerance, S_IWUSR | S_IRUGO,613 show_tolerance, store_tolerance, 0),614 SENSOR_ATTR(pwm2_tolerance, S_IWUSR | S_IRUGO,615 show_tolerance, store_tolerance, 1),616};617 618 619#define IN_UNIT_ATTRS(X) \620 &sda_in_input[X].dev_attr.attr, \621 &sda_in_min[X].dev_attr.attr, \622 &sda_in_max[X].dev_attr.attr623 624#define FAN_UNIT_ATTRS(X) \625 &sda_fan_input[X].dev_attr.attr, \626 &sda_fan_min[X].dev_attr.attr, \627 &sda_fan_div[X].dev_attr.attr628 629#define TEMP_UNIT_ATTRS(X) \630 &sda_temp_input[X].dev_attr.attr, \631 &sda_temp_max[X].dev_attr.attr, \632 &sda_temp_max_hyst[X].dev_attr.attr633 634#define PWM_UNIT_ATTRS(X) \635 &sda_pwm[X].dev_attr.attr, \636 &sda_pwm_mode[X].dev_attr.attr, \637 &sda_pwm_enable[X].dev_attr.attr638 639#define TOLERANCE_UNIT_ATTRS(X) \640 &sda_tolerance[X].dev_attr.attr641 642static struct attribute *w83l786ng_attrs[] = {643 IN_UNIT_ATTRS(0),644 IN_UNIT_ATTRS(1),645 IN_UNIT_ATTRS(2),646 FAN_UNIT_ATTRS(0),647 FAN_UNIT_ATTRS(1),648 TEMP_UNIT_ATTRS(0),649 TEMP_UNIT_ATTRS(1),650 PWM_UNIT_ATTRS(0),651 PWM_UNIT_ATTRS(1),652 TOLERANCE_UNIT_ATTRS(0),653 TOLERANCE_UNIT_ATTRS(1),654 NULL655};656 657ATTRIBUTE_GROUPS(w83l786ng);658 659static int660w83l786ng_detect(struct i2c_client *client, struct i2c_board_info *info)661{662 struct i2c_adapter *adapter = client->adapter;663 u16 man_id;664 u8 chip_id;665 666 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))667 return -ENODEV;668 669 /* Detection */670 if ((w83l786ng_read_value(client, W83L786NG_REG_CONFIG) & 0x80)) {671 dev_dbg(&adapter->dev, "W83L786NG detection failed at 0x%02x\n",672 client->addr);673 return -ENODEV;674 }675 676 /* Identification */677 man_id = (w83l786ng_read_value(client, W83L786NG_REG_MAN_ID1) << 8) +678 w83l786ng_read_value(client, W83L786NG_REG_MAN_ID2);679 chip_id = w83l786ng_read_value(client, W83L786NG_REG_CHIP_ID);680 681 if (man_id != 0x5CA3 || /* Winbond */682 chip_id != 0x80) { /* W83L786NG */683 dev_dbg(&adapter->dev,684 "Unsupported chip (man_id=0x%04X, chip_id=0x%02X)\n",685 man_id, chip_id);686 return -ENODEV;687 }688 689 strscpy(info->type, "w83l786ng", I2C_NAME_SIZE);690 691 return 0;692}693 694static void w83l786ng_init_client(struct i2c_client *client)695{696 u8 tmp;697 698 if (reset)699 w83l786ng_write_value(client, W83L786NG_REG_CONFIG, 0x80);700 701 /* Start monitoring */702 tmp = w83l786ng_read_value(client, W83L786NG_REG_CONFIG);703 if (!(tmp & 0x01))704 w83l786ng_write_value(client, W83L786NG_REG_CONFIG, tmp | 0x01);705}706 707static int708w83l786ng_probe(struct i2c_client *client)709{710 struct device *dev = &client->dev;711 struct w83l786ng_data *data;712 struct device *hwmon_dev;713 int i;714 u8 reg_tmp;715 716 data = devm_kzalloc(dev, sizeof(struct w83l786ng_data), GFP_KERNEL);717 if (!data)718 return -ENOMEM;719 720 data->client = client;721 mutex_init(&data->update_lock);722 723 /* Initialize the chip */724 w83l786ng_init_client(client);725 726 /* A few vars need to be filled upon startup */727 for (i = 0; i < 2; i++) {728 data->fan_min[i] = w83l786ng_read_value(client,729 W83L786NG_REG_FAN_MIN(i));730 }731 732 /* Update the fan divisor */733 reg_tmp = w83l786ng_read_value(client, W83L786NG_REG_FAN_DIV);734 data->fan_div[0] = reg_tmp & 0x07;735 data->fan_div[1] = (reg_tmp >> 4) & 0x07;736 737 hwmon_dev = devm_hwmon_device_register_with_groups(dev, client->name,738 data,739 w83l786ng_groups);740 return PTR_ERR_OR_ZERO(hwmon_dev);741}742 743static const struct i2c_device_id w83l786ng_id[] = {744 { "w83l786ng" },745 { }746};747MODULE_DEVICE_TABLE(i2c, w83l786ng_id);748 749static struct i2c_driver w83l786ng_driver = {750 .class = I2C_CLASS_HWMON,751 .driver = {752 .name = "w83l786ng",753 },754 .probe = w83l786ng_probe,755 .id_table = w83l786ng_id,756 .detect = w83l786ng_detect,757 .address_list = normal_i2c,758};759 760module_i2c_driver(w83l786ng_driver);761 762MODULE_AUTHOR("Kevin Lo");763MODULE_DESCRIPTION("w83l786ng driver");764MODULE_LICENSE("GPL");765