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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * lm87.c4 *5 * Copyright (C) 2000 Frodo Looijaard <frodol@dds.nl>6 * Philip Edelbrock <phil@netroedge.com>7 * Stephen Rousset <stephen.rousset@rocketlogix.com>8 * Dan Eaton <dan.eaton@rocketlogix.com>9 * Copyright (C) 2004-2008 Jean Delvare <jdelvare@suse.de>10 *11 * Original port to Linux 2.6 by Jeff Oliver.12 *13 * The LM87 is a sensor chip made by National Semiconductor. It monitors up14 * to 8 voltages (including its own power source), up to three temperatures15 * (its own plus up to two external ones) and up to two fans. The default16 * configuration is 6 voltages, two temperatures and two fans (see below).17 * Voltages are scaled internally with ratios such that the nominal value of18 * each voltage correspond to a register value of 192 (which means a19 * resolution of about 0.5% of the nominal value). Temperature values are20 * reported with a 1 deg resolution and a 3-4 deg accuracy. Complete21 * datasheet can be obtained from National's website at:22 * http://www.national.com/pf/LM/LM87.html23 *24 * Some functions share pins, so not all functions are available at the same25 * time. Which are depends on the hardware setup. This driver normally26 * assumes that firmware configured the chip correctly. Where this is not27 * the case, platform code must set the I2C client's platform_data to point28 * to a u8 value to be written to the channel register.29 * For reference, here is the list of exclusive functions:30 * - in0+in5 (default) or temp331 * - fan1 (default) or in632 * - fan2 (default) or in733 * - VID lines (default) or IRQ lines (not handled by this driver)34 *35 * The LM87 additionally features an analog output, supposedly usable to36 * control the speed of a fan. All new chips use pulse width modulation37 * instead. The LM87 is the only hardware monitoring chipset I know of38 * which uses amplitude modulation. Be careful when using this feature.39 *40 * This driver also supports the ADM1024, a sensor chip made by Analog41 * Devices. That chip is fully compatible with the LM87. Complete42 * datasheet can be obtained from Analog's website at:43 * https://www.analog.com/en/prod/0,2877,ADM1024,00.html44 */45 46#include <linux/module.h>47#include <linux/init.h>48#include <linux/slab.h>49#include <linux/jiffies.h>50#include <linux/i2c.h>51#include <linux/hwmon.h>52#include <linux/hwmon-sysfs.h>53#include <linux/hwmon-vid.h>54#include <linux/err.h>55#include <linux/mutex.h>56#include <linux/regulator/consumer.h>57 58/*59 * Addresses to scan60 * LM87 has three possible addresses: 0x2c, 0x2d and 0x2e.61 */62 63static const unsigned short normal_i2c[] = { 0x2c, 0x2d, 0x2e, I2C_CLIENT_END };64 65/*66 * The LM87 registers67 */68 69/* nr in 0..5 */70#define LM87_REG_IN(nr) (0x20 + (nr))71#define LM87_REG_IN_MAX(nr) (0x2B + (nr) * 2)72#define LM87_REG_IN_MIN(nr) (0x2C + (nr) * 2)73/* nr in 0..1 */74#define LM87_REG_AIN(nr) (0x28 + (nr))75#define LM87_REG_AIN_MIN(nr) (0x1A + (nr))76#define LM87_REG_AIN_MAX(nr) (0x3B + (nr))77 78static u8 LM87_REG_TEMP[3] = { 0x27, 0x26, 0x20 };79static u8 LM87_REG_TEMP_HIGH[3] = { 0x39, 0x37, 0x2B };80static u8 LM87_REG_TEMP_LOW[3] = { 0x3A, 0x38, 0x2C };81 82#define LM87_REG_TEMP_HW_INT_LOCK 0x1383#define LM87_REG_TEMP_HW_EXT_LOCK 0x1484#define LM87_REG_TEMP_HW_INT 0x1785#define LM87_REG_TEMP_HW_EXT 0x1886 87/* nr in 0..1 */88#define LM87_REG_FAN(nr) (0x28 + (nr))89#define LM87_REG_FAN_MIN(nr) (0x3B + (nr))90#define LM87_REG_AOUT 0x1991 92#define LM87_REG_CONFIG 0x4093#define LM87_REG_CHANNEL_MODE 0x1694#define LM87_REG_VID_FAN_DIV 0x4795#define LM87_REG_VID4 0x4996 97#define LM87_REG_ALARMS1 0x4198#define LM87_REG_ALARMS2 0x4299 100#define LM87_REG_COMPANY_ID 0x3E101#define LM87_REG_REVISION 0x3F102 103/*104 * Conversions and various macros105 * The LM87 uses signed 8-bit values for temperatures.106 */107 108#define IN_FROM_REG(reg, scale) (((reg) * (scale) + 96) / 192)109#define IN_TO_REG(val, scale) ((val) <= 0 ? 0 : \110 (val) >= (scale) * 255 / 192 ? 255 : \111 ((val) * 192 + (scale) / 2) / (scale))112 113#define TEMP_FROM_REG(reg) ((reg) * 1000)114#define TEMP_TO_REG(val) ((val) <= -127500 ? -128 : \115 (val) >= 126500 ? 127 : \116 (((val) < 0 ? (val) - 500 : \117 (val) + 500) / 1000))118 119#define FAN_FROM_REG(reg, div) ((reg) == 255 || (reg) == 0 ? 0 : \120 (1350000 + (reg)*(div) / 2) / ((reg) * (div)))121#define FAN_TO_REG(val, div) ((val) * (div) * 255 <= 1350000 ? 255 : \122 (1350000 + (val)*(div) / 2) / ((val) * (div)))123 124#define FAN_DIV_FROM_REG(reg) (1 << (reg))125 126/* analog out is 9.80mV/LSB */127#define AOUT_FROM_REG(reg) (((reg) * 98 + 5) / 10)128#define AOUT_TO_REG(val) ((val) <= 0 ? 0 : \129 (val) >= 2500 ? 255 : \130 ((val) * 10 + 49) / 98)131 132/* nr in 0..1 */133#define CHAN_NO_FAN(nr) (1 << (nr))134#define CHAN_TEMP3 (1 << 2)135#define CHAN_VCC_5V (1 << 3)136#define CHAN_NO_VID (1 << 7)137 138/*139 * Client data (each client gets its own)140 */141 142struct lm87_data {143 struct mutex update_lock;144 bool valid; /* false until following fields are valid */145 unsigned long last_updated; /* In jiffies */146 147 u8 channel; /* register value */148 u8 config; /* original register value */149 150 u8 in[8]; /* register value */151 u8 in_max[8]; /* register value */152 u8 in_min[8]; /* register value */153 u16 in_scale[8];154 155 s8 temp[3]; /* register value */156 s8 temp_high[3]; /* register value */157 s8 temp_low[3]; /* register value */158 s8 temp_crit_int; /* min of two register values */159 s8 temp_crit_ext; /* min of two register values */160 161 u8 fan[2]; /* register value */162 u8 fan_min[2]; /* register value */163 u8 fan_div[2]; /* register value, shifted right */164 u8 aout; /* register value */165 166 u16 alarms; /* register values, combined */167 u8 vid; /* register values, combined */168 u8 vrm;169 170 const struct attribute_group *attr_groups[6];171};172 173static inline int lm87_read_value(struct i2c_client *client, u8 reg)174{175 return i2c_smbus_read_byte_data(client, reg);176}177 178static inline int lm87_write_value(struct i2c_client *client, u8 reg, u8 value)179{180 return i2c_smbus_write_byte_data(client, reg, value);181}182 183static struct lm87_data *lm87_update_device(struct device *dev)184{185 struct i2c_client *client = dev_get_drvdata(dev);186 struct lm87_data *data = i2c_get_clientdata(client);187 188 mutex_lock(&data->update_lock);189 190 if (time_after(jiffies, data->last_updated + HZ) || !data->valid) {191 int i, j;192 193 dev_dbg(&client->dev, "Updating data.\n");194 195 i = (data->channel & CHAN_TEMP3) ? 1 : 0;196 j = (data->channel & CHAN_TEMP3) ? 5 : 6;197 for (; i < j; i++) {198 data->in[i] = lm87_read_value(client,199 LM87_REG_IN(i));200 data->in_min[i] = lm87_read_value(client,201 LM87_REG_IN_MIN(i));202 data->in_max[i] = lm87_read_value(client,203 LM87_REG_IN_MAX(i));204 }205 206 for (i = 0; i < 2; i++) {207 if (data->channel & CHAN_NO_FAN(i)) {208 data->in[6+i] = lm87_read_value(client,209 LM87_REG_AIN(i));210 data->in_max[6+i] = lm87_read_value(client,211 LM87_REG_AIN_MAX(i));212 data->in_min[6+i] = lm87_read_value(client,213 LM87_REG_AIN_MIN(i));214 215 } else {216 data->fan[i] = lm87_read_value(client,217 LM87_REG_FAN(i));218 data->fan_min[i] = lm87_read_value(client,219 LM87_REG_FAN_MIN(i));220 }221 }222 223 j = (data->channel & CHAN_TEMP3) ? 3 : 2;224 for (i = 0 ; i < j; i++) {225 data->temp[i] = lm87_read_value(client,226 LM87_REG_TEMP[i]);227 data->temp_high[i] = lm87_read_value(client,228 LM87_REG_TEMP_HIGH[i]);229 data->temp_low[i] = lm87_read_value(client,230 LM87_REG_TEMP_LOW[i]);231 }232 233 i = lm87_read_value(client, LM87_REG_TEMP_HW_INT_LOCK);234 j = lm87_read_value(client, LM87_REG_TEMP_HW_INT);235 data->temp_crit_int = min(i, j);236 237 i = lm87_read_value(client, LM87_REG_TEMP_HW_EXT_LOCK);238 j = lm87_read_value(client, LM87_REG_TEMP_HW_EXT);239 data->temp_crit_ext = min(i, j);240 241 i = lm87_read_value(client, LM87_REG_VID_FAN_DIV);242 data->fan_div[0] = (i >> 4) & 0x03;243 data->fan_div[1] = (i >> 6) & 0x03;244 data->vid = (i & 0x0F)245 | (lm87_read_value(client, LM87_REG_VID4) & 0x01)246 << 4;247 248 data->alarms = lm87_read_value(client, LM87_REG_ALARMS1)249 | (lm87_read_value(client, LM87_REG_ALARMS2)250 << 8);251 data->aout = lm87_read_value(client, LM87_REG_AOUT);252 253 data->last_updated = jiffies;254 data->valid = true;255 }256 257 mutex_unlock(&data->update_lock);258 259 return data;260}261 262/*263 * Sysfs stuff264 */265 266static ssize_t in_input_show(struct device *dev,267 struct device_attribute *attr, char *buf)268{269 struct lm87_data *data = lm87_update_device(dev);270 int nr = to_sensor_dev_attr(attr)->index;271 272 return sprintf(buf, "%u\n", IN_FROM_REG(data->in[nr],273 data->in_scale[nr]));274}275 276static ssize_t in_min_show(struct device *dev, struct device_attribute *attr,277 char *buf)278{279 struct lm87_data *data = lm87_update_device(dev);280 int nr = to_sensor_dev_attr(attr)->index;281 282 return sprintf(buf, "%u\n", IN_FROM_REG(data->in_min[nr],283 data->in_scale[nr]));284}285 286static ssize_t in_max_show(struct device *dev, struct device_attribute *attr,287 char *buf)288{289 struct lm87_data *data = lm87_update_device(dev);290 int nr = to_sensor_dev_attr(attr)->index;291 292 return sprintf(buf, "%u\n", IN_FROM_REG(data->in_max[nr],293 data->in_scale[nr]));294}295 296static ssize_t in_min_store(struct device *dev, struct device_attribute *attr,297 const char *buf, size_t count)298{299 struct i2c_client *client = dev_get_drvdata(dev);300 struct lm87_data *data = i2c_get_clientdata(client);301 int nr = to_sensor_dev_attr(attr)->index;302 long val;303 int err;304 305 err = kstrtol(buf, 10, &val);306 if (err)307 return err;308 309 mutex_lock(&data->update_lock);310 data->in_min[nr] = IN_TO_REG(val, data->in_scale[nr]);311 lm87_write_value(client, nr < 6 ? LM87_REG_IN_MIN(nr) :312 LM87_REG_AIN_MIN(nr - 6), data->in_min[nr]);313 mutex_unlock(&data->update_lock);314 return count;315}316 317static ssize_t in_max_store(struct device *dev, struct device_attribute *attr,318 const char *buf, size_t count)319{320 struct i2c_client *client = dev_get_drvdata(dev);321 struct lm87_data *data = i2c_get_clientdata(client);322 int nr = to_sensor_dev_attr(attr)->index;323 long val;324 int err;325 326 err = kstrtol(buf, 10, &val);327 if (err)328 return err;329 330 mutex_lock(&data->update_lock);331 data->in_max[nr] = IN_TO_REG(val, data->in_scale[nr]);332 lm87_write_value(client, nr < 6 ? LM87_REG_IN_MAX(nr) :333 LM87_REG_AIN_MAX(nr - 6), data->in_max[nr]);334 mutex_unlock(&data->update_lock);335 return count;336}337 338static SENSOR_DEVICE_ATTR_RO(in0_input, in_input, 0);339static SENSOR_DEVICE_ATTR_RW(in0_min, in_min, 0);340static SENSOR_DEVICE_ATTR_RW(in0_max, in_max, 0);341static SENSOR_DEVICE_ATTR_RO(in1_input, in_input, 1);342static SENSOR_DEVICE_ATTR_RW(in1_min, in_min, 1);343static SENSOR_DEVICE_ATTR_RW(in1_max, in_max, 1);344static SENSOR_DEVICE_ATTR_RO(in2_input, in_input, 2);345static SENSOR_DEVICE_ATTR_RW(in2_min, in_min, 2);346static SENSOR_DEVICE_ATTR_RW(in2_max, in_max, 2);347static SENSOR_DEVICE_ATTR_RO(in3_input, in_input, 3);348static SENSOR_DEVICE_ATTR_RW(in3_min, in_min, 3);349static SENSOR_DEVICE_ATTR_RW(in3_max, in_max, 3);350static SENSOR_DEVICE_ATTR_RO(in4_input, in_input, 4);351static SENSOR_DEVICE_ATTR_RW(in4_min, in_min, 4);352static SENSOR_DEVICE_ATTR_RW(in4_max, in_max, 4);353static SENSOR_DEVICE_ATTR_RO(in5_input, in_input, 5);354static SENSOR_DEVICE_ATTR_RW(in5_min, in_min, 5);355static SENSOR_DEVICE_ATTR_RW(in5_max, in_max, 5);356static SENSOR_DEVICE_ATTR_RO(in6_input, in_input, 6);357static SENSOR_DEVICE_ATTR_RW(in6_min, in_min, 6);358static SENSOR_DEVICE_ATTR_RW(in6_max, in_max, 6);359static SENSOR_DEVICE_ATTR_RO(in7_input, in_input, 7);360static SENSOR_DEVICE_ATTR_RW(in7_min, in_min, 7);361static SENSOR_DEVICE_ATTR_RW(in7_max, in_max, 7);362 363static ssize_t temp_input_show(struct device *dev,364 struct device_attribute *attr, char *buf)365{366 struct lm87_data *data = lm87_update_device(dev);367 int nr = to_sensor_dev_attr(attr)->index;368 369 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp[nr]));370}371 372static ssize_t temp_low_show(struct device *dev,373 struct device_attribute *attr, char *buf)374{375 struct lm87_data *data = lm87_update_device(dev);376 int nr = to_sensor_dev_attr(attr)->index;377 378 return sprintf(buf, "%d\n",379 TEMP_FROM_REG(data->temp_low[nr]));380}381 382static ssize_t temp_high_show(struct device *dev,383 struct device_attribute *attr, char *buf)384{385 struct lm87_data *data = lm87_update_device(dev);386 int nr = to_sensor_dev_attr(attr)->index;387 388 return sprintf(buf, "%d\n",389 TEMP_FROM_REG(data->temp_high[nr]));390}391 392static ssize_t temp_low_store(struct device *dev,393 struct device_attribute *attr, const char *buf,394 size_t count)395{396 struct i2c_client *client = dev_get_drvdata(dev);397 struct lm87_data *data = i2c_get_clientdata(client);398 int nr = to_sensor_dev_attr(attr)->index;399 long val;400 int err;401 402 err = kstrtol(buf, 10, &val);403 if (err)404 return err;405 406 mutex_lock(&data->update_lock);407 data->temp_low[nr] = TEMP_TO_REG(val);408 lm87_write_value(client, LM87_REG_TEMP_LOW[nr], data->temp_low[nr]);409 mutex_unlock(&data->update_lock);410 return count;411}412 413static ssize_t temp_high_store(struct device *dev,414 struct device_attribute *attr, const char *buf,415 size_t count)416{417 struct i2c_client *client = dev_get_drvdata(dev);418 struct lm87_data *data = i2c_get_clientdata(client);419 int nr = to_sensor_dev_attr(attr)->index;420 long val;421 int err;422 423 err = kstrtol(buf, 10, &val);424 if (err)425 return err;426 427 mutex_lock(&data->update_lock);428 data->temp_high[nr] = TEMP_TO_REG(val);429 lm87_write_value(client, LM87_REG_TEMP_HIGH[nr], data->temp_high[nr]);430 mutex_unlock(&data->update_lock);431 return count;432}433 434static SENSOR_DEVICE_ATTR_RO(temp1_input, temp_input, 0);435static SENSOR_DEVICE_ATTR_RW(temp1_min, temp_low, 0);436static SENSOR_DEVICE_ATTR_RW(temp1_max, temp_high, 0);437static SENSOR_DEVICE_ATTR_RO(temp2_input, temp_input, 1);438static SENSOR_DEVICE_ATTR_RW(temp2_min, temp_low, 1);439static SENSOR_DEVICE_ATTR_RW(temp2_max, temp_high, 1);440static SENSOR_DEVICE_ATTR_RO(temp3_input, temp_input, 2);441static SENSOR_DEVICE_ATTR_RW(temp3_min, temp_low, 2);442static SENSOR_DEVICE_ATTR_RW(temp3_max, temp_high, 2);443 444static ssize_t temp1_crit_show(struct device *dev,445 struct device_attribute *attr, char *buf)446{447 struct lm87_data *data = lm87_update_device(dev);448 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_crit_int));449}450 451static ssize_t temp2_crit_show(struct device *dev,452 struct device_attribute *attr, char *buf)453{454 struct lm87_data *data = lm87_update_device(dev);455 return sprintf(buf, "%d\n", TEMP_FROM_REG(data->temp_crit_ext));456}457 458static DEVICE_ATTR_RO(temp1_crit);459static DEVICE_ATTR_RO(temp2_crit);460static DEVICE_ATTR(temp3_crit, 0444, temp2_crit_show, NULL);461 462static ssize_t fan_input_show(struct device *dev,463 struct device_attribute *attr, char *buf)464{465 struct lm87_data *data = lm87_update_device(dev);466 int nr = to_sensor_dev_attr(attr)->index;467 468 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan[nr],469 FAN_DIV_FROM_REG(data->fan_div[nr])));470}471 472static ssize_t fan_min_show(struct device *dev, struct device_attribute *attr,473 char *buf)474{475 struct lm87_data *data = lm87_update_device(dev);476 int nr = to_sensor_dev_attr(attr)->index;477 478 return sprintf(buf, "%d\n", FAN_FROM_REG(data->fan_min[nr],479 FAN_DIV_FROM_REG(data->fan_div[nr])));480}481 482static ssize_t fan_div_show(struct device *dev, struct device_attribute *attr,483 char *buf)484{485 struct lm87_data *data = lm87_update_device(dev);486 int nr = to_sensor_dev_attr(attr)->index;487 488 return sprintf(buf, "%d\n",489 FAN_DIV_FROM_REG(data->fan_div[nr]));490}491 492static ssize_t fan_min_store(struct device *dev,493 struct device_attribute *attr, const char *buf,494 size_t count)495{496 struct i2c_client *client = dev_get_drvdata(dev);497 struct lm87_data *data = i2c_get_clientdata(client);498 int nr = to_sensor_dev_attr(attr)->index;499 long val;500 int err;501 502 err = kstrtol(buf, 10, &val);503 if (err)504 return err;505 506 mutex_lock(&data->update_lock);507 data->fan_min[nr] = FAN_TO_REG(val,508 FAN_DIV_FROM_REG(data->fan_div[nr]));509 lm87_write_value(client, LM87_REG_FAN_MIN(nr), data->fan_min[nr]);510 mutex_unlock(&data->update_lock);511 return count;512}513 514/*515 * Note: we save and restore the fan minimum here, because its value is516 * determined in part by the fan clock divider. This follows the principle517 * of least surprise; the user doesn't expect the fan minimum to change just518 * because the divider changed.519 */520static ssize_t fan_div_store(struct device *dev,521 struct device_attribute *attr, const char *buf,522 size_t count)523{524 struct i2c_client *client = dev_get_drvdata(dev);525 struct lm87_data *data = i2c_get_clientdata(client);526 int nr = to_sensor_dev_attr(attr)->index;527 long val;528 int err;529 unsigned long min;530 u8 reg;531 532 err = kstrtol(buf, 10, &val);533 if (err)534 return err;535 536 mutex_lock(&data->update_lock);537 min = FAN_FROM_REG(data->fan_min[nr],538 FAN_DIV_FROM_REG(data->fan_div[nr]));539 540 switch (val) {541 case 1:542 data->fan_div[nr] = 0;543 break;544 case 2:545 data->fan_div[nr] = 1;546 break;547 case 4:548 data->fan_div[nr] = 2;549 break;550 case 8:551 data->fan_div[nr] = 3;552 break;553 default:554 mutex_unlock(&data->update_lock);555 return -EINVAL;556 }557 558 reg = lm87_read_value(client, LM87_REG_VID_FAN_DIV);559 switch (nr) {560 case 0:561 reg = (reg & 0xCF) | (data->fan_div[0] << 4);562 break;563 case 1:564 reg = (reg & 0x3F) | (data->fan_div[1] << 6);565 break;566 }567 lm87_write_value(client, LM87_REG_VID_FAN_DIV, reg);568 569 data->fan_min[nr] = FAN_TO_REG(min, val);570 lm87_write_value(client, LM87_REG_FAN_MIN(nr),571 data->fan_min[nr]);572 mutex_unlock(&data->update_lock);573 574 return count;575}576 577static SENSOR_DEVICE_ATTR_RO(fan1_input, fan_input, 0);578static SENSOR_DEVICE_ATTR_RW(fan1_min, fan_min, 0);579static SENSOR_DEVICE_ATTR_RW(fan1_div, fan_div, 0);580static SENSOR_DEVICE_ATTR_RO(fan2_input, fan_input, 1);581static SENSOR_DEVICE_ATTR_RW(fan2_min, fan_min, 1);582static SENSOR_DEVICE_ATTR_RW(fan2_div, fan_div, 1);583 584static ssize_t alarms_show(struct device *dev, struct device_attribute *attr,585 char *buf)586{587 struct lm87_data *data = lm87_update_device(dev);588 return sprintf(buf, "%d\n", data->alarms);589}590static DEVICE_ATTR_RO(alarms);591 592static ssize_t cpu0_vid_show(struct device *dev,593 struct device_attribute *attr, char *buf)594{595 struct lm87_data *data = lm87_update_device(dev);596 return sprintf(buf, "%d\n", vid_from_reg(data->vid, data->vrm));597}598static DEVICE_ATTR_RO(cpu0_vid);599 600static ssize_t vrm_show(struct device *dev, struct device_attribute *attr,601 char *buf)602{603 struct lm87_data *data = dev_get_drvdata(dev);604 return sprintf(buf, "%d\n", data->vrm);605}606static ssize_t vrm_store(struct device *dev, struct device_attribute *attr,607 const char *buf, size_t count)608{609 struct lm87_data *data = dev_get_drvdata(dev);610 unsigned long val;611 int err;612 613 err = kstrtoul(buf, 10, &val);614 if (err)615 return err;616 617 if (val > 255)618 return -EINVAL;619 620 data->vrm = val;621 return count;622}623static DEVICE_ATTR_RW(vrm);624 625static ssize_t aout_output_show(struct device *dev,626 struct device_attribute *attr, char *buf)627{628 struct lm87_data *data = lm87_update_device(dev);629 return sprintf(buf, "%d\n", AOUT_FROM_REG(data->aout));630}631static ssize_t aout_output_store(struct device *dev,632 struct device_attribute *attr,633 const char *buf, size_t count)634{635 struct i2c_client *client = dev_get_drvdata(dev);636 struct lm87_data *data = i2c_get_clientdata(client);637 long val;638 int err;639 640 err = kstrtol(buf, 10, &val);641 if (err)642 return err;643 644 mutex_lock(&data->update_lock);645 data->aout = AOUT_TO_REG(val);646 lm87_write_value(client, LM87_REG_AOUT, data->aout);647 mutex_unlock(&data->update_lock);648 return count;649}650static DEVICE_ATTR_RW(aout_output);651 652static ssize_t alarm_show(struct device *dev, struct device_attribute *attr,653 char *buf)654{655 struct lm87_data *data = lm87_update_device(dev);656 int bitnr = to_sensor_dev_attr(attr)->index;657 return sprintf(buf, "%u\n", (data->alarms >> bitnr) & 1);658}659static SENSOR_DEVICE_ATTR_RO(in0_alarm, alarm, 0);660static SENSOR_DEVICE_ATTR_RO(in1_alarm, alarm, 1);661static SENSOR_DEVICE_ATTR_RO(in2_alarm, alarm, 2);662static SENSOR_DEVICE_ATTR_RO(in3_alarm, alarm, 3);663static SENSOR_DEVICE_ATTR_RO(in4_alarm, alarm, 8);664static SENSOR_DEVICE_ATTR_RO(in5_alarm, alarm, 9);665static SENSOR_DEVICE_ATTR_RO(in6_alarm, alarm, 6);666static SENSOR_DEVICE_ATTR_RO(in7_alarm, alarm, 7);667static SENSOR_DEVICE_ATTR_RO(temp1_alarm, alarm, 4);668static SENSOR_DEVICE_ATTR_RO(temp2_alarm, alarm, 5);669static SENSOR_DEVICE_ATTR_RO(temp3_alarm, alarm, 5);670static SENSOR_DEVICE_ATTR_RO(fan1_alarm, alarm, 6);671static SENSOR_DEVICE_ATTR_RO(fan2_alarm, alarm, 7);672static SENSOR_DEVICE_ATTR_RO(temp2_fault, alarm, 14);673static SENSOR_DEVICE_ATTR_RO(temp3_fault, alarm, 15);674 675/*676 * Real code677 */678 679static struct attribute *lm87_attributes[] = {680 &sensor_dev_attr_in1_input.dev_attr.attr,681 &sensor_dev_attr_in1_min.dev_attr.attr,682 &sensor_dev_attr_in1_max.dev_attr.attr,683 &sensor_dev_attr_in1_alarm.dev_attr.attr,684 &sensor_dev_attr_in2_input.dev_attr.attr,685 &sensor_dev_attr_in2_min.dev_attr.attr,686 &sensor_dev_attr_in2_max.dev_attr.attr,687 &sensor_dev_attr_in2_alarm.dev_attr.attr,688 &sensor_dev_attr_in3_input.dev_attr.attr,689 &sensor_dev_attr_in3_min.dev_attr.attr,690 &sensor_dev_attr_in3_max.dev_attr.attr,691 &sensor_dev_attr_in3_alarm.dev_attr.attr,692 &sensor_dev_attr_in4_input.dev_attr.attr,693 &sensor_dev_attr_in4_min.dev_attr.attr,694 &sensor_dev_attr_in4_max.dev_attr.attr,695 &sensor_dev_attr_in4_alarm.dev_attr.attr,696 697 &sensor_dev_attr_temp1_input.dev_attr.attr,698 &sensor_dev_attr_temp1_max.dev_attr.attr,699 &sensor_dev_attr_temp1_min.dev_attr.attr,700 &dev_attr_temp1_crit.attr,701 &sensor_dev_attr_temp1_alarm.dev_attr.attr,702 &sensor_dev_attr_temp2_input.dev_attr.attr,703 &sensor_dev_attr_temp2_max.dev_attr.attr,704 &sensor_dev_attr_temp2_min.dev_attr.attr,705 &dev_attr_temp2_crit.attr,706 &sensor_dev_attr_temp2_alarm.dev_attr.attr,707 &sensor_dev_attr_temp2_fault.dev_attr.attr,708 709 &dev_attr_alarms.attr,710 &dev_attr_aout_output.attr,711 712 NULL713};714 715static const struct attribute_group lm87_group = {716 .attrs = lm87_attributes,717};718 719static struct attribute *lm87_attributes_in6[] = {720 &sensor_dev_attr_in6_input.dev_attr.attr,721 &sensor_dev_attr_in6_min.dev_attr.attr,722 &sensor_dev_attr_in6_max.dev_attr.attr,723 &sensor_dev_attr_in6_alarm.dev_attr.attr,724 NULL725};726 727static const struct attribute_group lm87_group_in6 = {728 .attrs = lm87_attributes_in6,729};730 731static struct attribute *lm87_attributes_fan1[] = {732 &sensor_dev_attr_fan1_input.dev_attr.attr,733 &sensor_dev_attr_fan1_min.dev_attr.attr,734 &sensor_dev_attr_fan1_div.dev_attr.attr,735 &sensor_dev_attr_fan1_alarm.dev_attr.attr,736 NULL737};738 739static const struct attribute_group lm87_group_fan1 = {740 .attrs = lm87_attributes_fan1,741};742 743static struct attribute *lm87_attributes_in7[] = {744 &sensor_dev_attr_in7_input.dev_attr.attr,745 &sensor_dev_attr_in7_min.dev_attr.attr,746 &sensor_dev_attr_in7_max.dev_attr.attr,747 &sensor_dev_attr_in7_alarm.dev_attr.attr,748 NULL749};750 751static const struct attribute_group lm87_group_in7 = {752 .attrs = lm87_attributes_in7,753};754 755static struct attribute *lm87_attributes_fan2[] = {756 &sensor_dev_attr_fan2_input.dev_attr.attr,757 &sensor_dev_attr_fan2_min.dev_attr.attr,758 &sensor_dev_attr_fan2_div.dev_attr.attr,759 &sensor_dev_attr_fan2_alarm.dev_attr.attr,760 NULL761};762 763static const struct attribute_group lm87_group_fan2 = {764 .attrs = lm87_attributes_fan2,765};766 767static struct attribute *lm87_attributes_temp3[] = {768 &sensor_dev_attr_temp3_input.dev_attr.attr,769 &sensor_dev_attr_temp3_max.dev_attr.attr,770 &sensor_dev_attr_temp3_min.dev_attr.attr,771 &dev_attr_temp3_crit.attr,772 &sensor_dev_attr_temp3_alarm.dev_attr.attr,773 &sensor_dev_attr_temp3_fault.dev_attr.attr,774 NULL775};776 777static const struct attribute_group lm87_group_temp3 = {778 .attrs = lm87_attributes_temp3,779};780 781static struct attribute *lm87_attributes_in0_5[] = {782 &sensor_dev_attr_in0_input.dev_attr.attr,783 &sensor_dev_attr_in0_min.dev_attr.attr,784 &sensor_dev_attr_in0_max.dev_attr.attr,785 &sensor_dev_attr_in0_alarm.dev_attr.attr,786 &sensor_dev_attr_in5_input.dev_attr.attr,787 &sensor_dev_attr_in5_min.dev_attr.attr,788 &sensor_dev_attr_in5_max.dev_attr.attr,789 &sensor_dev_attr_in5_alarm.dev_attr.attr,790 NULL791};792 793static const struct attribute_group lm87_group_in0_5 = {794 .attrs = lm87_attributes_in0_5,795};796 797static struct attribute *lm87_attributes_vid[] = {798 &dev_attr_cpu0_vid.attr,799 &dev_attr_vrm.attr,800 NULL801};802 803static const struct attribute_group lm87_group_vid = {804 .attrs = lm87_attributes_vid,805};806 807/* Return 0 if detection is successful, -ENODEV otherwise */808static int lm87_detect(struct i2c_client *client, struct i2c_board_info *info)809{810 struct i2c_adapter *adapter = client->adapter;811 const char *name;812 u8 cid, rev;813 814 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))815 return -ENODEV;816 817 if (lm87_read_value(client, LM87_REG_CONFIG) & 0x80)818 return -ENODEV;819 820 /* Now, we do the remaining detection. */821 cid = lm87_read_value(client, LM87_REG_COMPANY_ID);822 rev = lm87_read_value(client, LM87_REG_REVISION);823 824 if (cid == 0x02 /* National Semiconductor */825 && (rev >= 0x01 && rev <= 0x08))826 name = "lm87";827 else if (cid == 0x41 /* Analog Devices */828 && (rev & 0xf0) == 0x10)829 name = "adm1024";830 else {831 dev_dbg(&adapter->dev, "LM87 detection failed at 0x%02x\n",832 client->addr);833 return -ENODEV;834 }835 836 strscpy(info->type, name, I2C_NAME_SIZE);837 838 return 0;839}840 841static void lm87_restore_config(void *arg)842{843 struct i2c_client *client = arg;844 struct lm87_data *data = i2c_get_clientdata(client);845 846 lm87_write_value(client, LM87_REG_CONFIG, data->config);847}848 849static int lm87_init_client(struct i2c_client *client)850{851 struct lm87_data *data = i2c_get_clientdata(client);852 int rc;853 struct device_node *of_node = client->dev.of_node;854 u8 val = 0;855 struct regulator *vcc = NULL;856 857 if (of_node) {858 if (of_property_read_bool(of_node, "has-temp3"))859 val |= CHAN_TEMP3;860 if (of_property_read_bool(of_node, "has-in6"))861 val |= CHAN_NO_FAN(0);862 if (of_property_read_bool(of_node, "has-in7"))863 val |= CHAN_NO_FAN(1);864 vcc = devm_regulator_get_optional(&client->dev, "vcc");865 if (!IS_ERR(vcc)) {866 if (regulator_get_voltage(vcc) == 5000000)867 val |= CHAN_VCC_5V;868 }869 data->channel = val;870 lm87_write_value(client,871 LM87_REG_CHANNEL_MODE, data->channel);872 } else if (dev_get_platdata(&client->dev)) {873 data->channel = *(u8 *)dev_get_platdata(&client->dev);874 lm87_write_value(client,875 LM87_REG_CHANNEL_MODE, data->channel);876 } else {877 data->channel = lm87_read_value(client, LM87_REG_CHANNEL_MODE);878 }879 data->config = lm87_read_value(client, LM87_REG_CONFIG) & 0x6F;880 881 rc = devm_add_action(&client->dev, lm87_restore_config, client);882 if (rc)883 return rc;884 885 if (!(data->config & 0x01)) {886 int i;887 888 /* Limits are left uninitialized after power-up */889 for (i = 1; i < 6; i++) {890 lm87_write_value(client, LM87_REG_IN_MIN(i), 0x00);891 lm87_write_value(client, LM87_REG_IN_MAX(i), 0xFF);892 }893 for (i = 0; i < 2; i++) {894 lm87_write_value(client, LM87_REG_TEMP_HIGH[i], 0x7F);895 lm87_write_value(client, LM87_REG_TEMP_LOW[i], 0x00);896 lm87_write_value(client, LM87_REG_AIN_MIN(i), 0x00);897 lm87_write_value(client, LM87_REG_AIN_MAX(i), 0xFF);898 }899 if (data->channel & CHAN_TEMP3) {900 lm87_write_value(client, LM87_REG_TEMP_HIGH[2], 0x7F);901 lm87_write_value(client, LM87_REG_TEMP_LOW[2], 0x00);902 } else {903 lm87_write_value(client, LM87_REG_IN_MIN(0), 0x00);904 lm87_write_value(client, LM87_REG_IN_MAX(0), 0xFF);905 }906 }907 908 /* Make sure Start is set and INT#_Clear is clear */909 if ((data->config & 0x09) != 0x01)910 lm87_write_value(client, LM87_REG_CONFIG,911 (data->config & 0x77) | 0x01);912 return 0;913}914 915static int lm87_probe(struct i2c_client *client)916{917 struct lm87_data *data;918 struct device *hwmon_dev;919 int err;920 unsigned int group_tail = 0;921 922 data = devm_kzalloc(&client->dev, sizeof(struct lm87_data), GFP_KERNEL);923 if (!data)924 return -ENOMEM;925 926 i2c_set_clientdata(client, data);927 mutex_init(&data->update_lock);928 929 /* Initialize the LM87 chip */930 err = lm87_init_client(client);931 if (err)932 return err;933 934 data->in_scale[0] = 2500;935 data->in_scale[1] = 2700;936 data->in_scale[2] = (data->channel & CHAN_VCC_5V) ? 5000 : 3300;937 data->in_scale[3] = 5000;938 data->in_scale[4] = 12000;939 data->in_scale[5] = 2700;940 data->in_scale[6] = 1875;941 data->in_scale[7] = 1875;942 943 /*944 * Construct the list of attributes, the list depends on the945 * configuration of the chip946 */947 data->attr_groups[group_tail++] = &lm87_group;948 if (data->channel & CHAN_NO_FAN(0))949 data->attr_groups[group_tail++] = &lm87_group_in6;950 else951 data->attr_groups[group_tail++] = &lm87_group_fan1;952 953 if (data->channel & CHAN_NO_FAN(1))954 data->attr_groups[group_tail++] = &lm87_group_in7;955 else956 data->attr_groups[group_tail++] = &lm87_group_fan2;957 958 if (data->channel & CHAN_TEMP3)959 data->attr_groups[group_tail++] = &lm87_group_temp3;960 else961 data->attr_groups[group_tail++] = &lm87_group_in0_5;962 963 if (!(data->channel & CHAN_NO_VID)) {964 data->vrm = vid_which_vrm();965 data->attr_groups[group_tail++] = &lm87_group_vid;966 }967 968 hwmon_dev = devm_hwmon_device_register_with_groups(969 &client->dev, client->name, client, data->attr_groups);970 return PTR_ERR_OR_ZERO(hwmon_dev);971}972 973/*974 * Driver data (common to all clients)975 */976 977static const struct i2c_device_id lm87_id[] = {978 { "lm87" },979 { "adm1024" },980 { }981};982MODULE_DEVICE_TABLE(i2c, lm87_id);983 984static const struct of_device_id lm87_of_match[] = {985 { .compatible = "ti,lm87" },986 { .compatible = "adi,adm1024" },987 { },988};989MODULE_DEVICE_TABLE(of, lm87_of_match);990 991static struct i2c_driver lm87_driver = {992 .class = I2C_CLASS_HWMON,993 .driver = {994 .name = "lm87",995 .of_match_table = lm87_of_match,996 },997 .probe = lm87_probe,998 .id_table = lm87_id,999 .detect = lm87_detect,1000 .address_list = normal_i2c,1001};1002 1003module_i2c_driver(lm87_driver);1004 1005MODULE_AUTHOR("Jean Delvare <jdelvare@suse.de> and others");1006MODULE_DESCRIPTION("LM87 driver");1007MODULE_LICENSE("GPL");1008