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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Driver for Texas Instruments / National Semiconductor LM952344 *5 * Copyright (c) 2013, 2014 Guenter Roeck <linux@roeck-us.net>6 *7 * Derived from lm95241.c8 * Copyright (C) 2008, 2010 Davide Rizzo <elpa.rizzo@gmail.com>9 */10 11#include <linux/err.h>12#include <linux/hwmon.h>13#include <linux/i2c.h>14#include <linux/init.h>15#include <linux/module.h>16#include <linux/slab.h>17#include <linux/mutex.h>18#include <linux/regmap.h>19#include <linux/util_macros.h>20 21#define DRVNAME "lm95234"22 23enum chips { lm95233, lm95234 };24 25static const unsigned short normal_i2c[] = {26 0x18, 0x2a, 0x2b, 0x4d, 0x4e, I2C_CLIENT_END };27 28/* LM95234 registers */29#define LM95234_REG_MAN_ID 0xFE30#define LM95234_REG_CHIP_ID 0xFF31#define LM95234_REG_STATUS 0x0232#define LM95234_REG_CONFIG 0x0333#define LM95234_REG_CONVRATE 0x0434#define LM95234_REG_ENABLE 0x0535#define LM95234_REG_FILTER 0x0636#define LM95234_REG_STS_FAULT 0x0737#define LM95234_REG_STS_TCRIT1 0x0838#define LM95234_REG_STS_TCRIT2 0x0939#define LM95234_REG_TEMPH(x) ((x) + 0x10)40#define LM95234_REG_TEMPL(x) ((x) + 0x20)41#define LM95234_REG_UTEMPH(x) ((x) + 0x19) /* Remote only */42#define LM95234_REG_UTEMPL(x) ((x) + 0x29)43#define LM95234_REG_REM_MODEL 0x3044#define LM95234_REG_REM_MODEL_STS 0x3845#define LM95234_REG_OFFSET(x) ((x) + 0x31) /* Remote only */46#define LM95234_REG_TCRIT1(x) ((x) + 0x40)47#define LM95234_REG_TCRIT2(x) ((x) + 0x49) /* Remote channel 1,2 */48#define LM95234_REG_TCRIT_HYST 0x5a49 50#define NATSEMI_MAN_ID 0x0151#define LM95233_CHIP_ID 0x8952#define LM95234_CHIP_ID 0x7953 54/* Client data (each client gets its own) */55struct lm95234_data {56 struct regmap *regmap;57 struct mutex update_lock;58 enum chips type;59};60 61static int lm95234_read_temp(struct regmap *regmap, int index, long *t)62{63 unsigned int regs[2];64 int temp = 0, ret;65 u8 regvals[2];66 67 if (index) {68 regs[0] = LM95234_REG_UTEMPH(index - 1);69 regs[1] = LM95234_REG_UTEMPL(index - 1);70 ret = regmap_multi_reg_read(regmap, regs, regvals, 2);71 if (ret)72 return ret;73 temp = (regvals[0] << 8) | regvals[1];74 }75 /*76 * Read signed temperature if unsigned temperature is 0,77 * or if this is the local sensor.78 */79 if (!temp) {80 regs[0] = LM95234_REG_TEMPH(index);81 regs[1] = LM95234_REG_TEMPL(index);82 ret = regmap_multi_reg_read(regmap, regs, regvals, 2);83 if (ret)84 return ret;85 temp = (regvals[0] << 8) | regvals[1];86 temp = sign_extend32(temp, 15);87 }88 *t = DIV_ROUND_CLOSEST(temp * 125, 32);89 return 0;90}91 92static int lm95234_hyst_get(struct regmap *regmap, int reg, long *val)93{94 unsigned int regs[2] = {reg, LM95234_REG_TCRIT_HYST};95 u8 regvals[2];96 int ret;97 98 ret = regmap_multi_reg_read(regmap, regs, regvals, 2);99 if (ret)100 return ret;101 *val = (regvals[0] - regvals[1]) * 1000;102 return 0;103}104 105static ssize_t lm95234_hyst_set(struct lm95234_data *data, long val)106{107 u32 tcrit;108 int ret;109 110 mutex_lock(&data->update_lock);111 112 ret = regmap_read(data->regmap, LM95234_REG_TCRIT1(0), &tcrit);113 if (ret)114 goto unlock;115 116 val = DIV_ROUND_CLOSEST(clamp_val(val, -255000, 255000), 1000);117 val = clamp_val((int)tcrit - val, 0, 31);118 119 ret = regmap_write(data->regmap, LM95234_REG_TCRIT_HYST, val);120unlock:121 mutex_unlock(&data->update_lock);122 return ret;123}124 125static int lm95234_crit_reg(int channel)126{127 if (channel == 1 || channel == 2)128 return LM95234_REG_TCRIT2(channel - 1);129 return LM95234_REG_TCRIT1(channel);130}131 132static int lm95234_temp_write(struct device *dev, u32 attr, int channel, long val)133{134 struct lm95234_data *data = dev_get_drvdata(dev);135 struct regmap *regmap = data->regmap;136 137 switch (attr) {138 case hwmon_temp_enable:139 if (val && val != 1)140 return -EINVAL;141 return regmap_update_bits(regmap, LM95234_REG_ENABLE,142 BIT(channel), val ? BIT(channel) : 0);143 case hwmon_temp_type:144 if (val != 1 && val != 2)145 return -EINVAL;146 return regmap_update_bits(regmap, LM95234_REG_REM_MODEL,147 BIT(channel),148 val == 1 ? BIT(channel) : 0);149 case hwmon_temp_offset:150 val = DIV_ROUND_CLOSEST(clamp_val(val, -64000, 63500), 500);151 return regmap_write(regmap, LM95234_REG_OFFSET(channel - 1), val);152 case hwmon_temp_max:153 val = clamp_val(val, 0, channel == 1 ? 127000 : 255000);154 val = DIV_ROUND_CLOSEST(val, 1000);155 return regmap_write(regmap, lm95234_crit_reg(channel), val);156 case hwmon_temp_max_hyst:157 return lm95234_hyst_set(data, val);158 case hwmon_temp_crit:159 val = DIV_ROUND_CLOSEST(clamp_val(val, 0, 255000), 1000);160 return regmap_write(regmap, LM95234_REG_TCRIT1(channel), val);161 default:162 return -EOPNOTSUPP;163 }164 return 0;165}166 167static int lm95234_alarm_reg(int channel)168{169 if (channel == 1 || channel == 2)170 return LM95234_REG_STS_TCRIT2;171 return LM95234_REG_STS_TCRIT1;172}173 174static int lm95234_temp_read(struct device *dev, u32 attr, int channel, long *val)175{176 struct lm95234_data *data = dev_get_drvdata(dev);177 struct regmap *regmap = data->regmap;178 u32 regval, mask;179 int ret;180 181 switch (attr) {182 case hwmon_temp_enable:183 ret = regmap_read(regmap, LM95234_REG_ENABLE, ®val);184 if (ret)185 return ret;186 *val = !!(regval & BIT(channel));187 break;188 case hwmon_temp_input:189 return lm95234_read_temp(regmap, channel, val);190 case hwmon_temp_max_alarm:191 ret = regmap_read(regmap, lm95234_alarm_reg(channel), ®val);192 if (ret)193 return ret;194 *val = !!(regval & BIT(channel));195 break;196 case hwmon_temp_crit_alarm:197 ret = regmap_read(regmap, LM95234_REG_STS_TCRIT1, ®val);198 if (ret)199 return ret;200 *val = !!(regval & BIT(channel));201 break;202 case hwmon_temp_crit_hyst:203 return lm95234_hyst_get(regmap, LM95234_REG_TCRIT1(channel), val);204 case hwmon_temp_type:205 ret = regmap_read(regmap, LM95234_REG_REM_MODEL, ®val);206 if (ret)207 return ret;208 *val = (regval & BIT(channel)) ? 1 : 2;209 break;210 case hwmon_temp_offset:211 ret = regmap_read(regmap, LM95234_REG_OFFSET(channel - 1), ®val);212 if (ret)213 return ret;214 *val = sign_extend32(regval, 7) * 500;215 break;216 case hwmon_temp_fault:217 ret = regmap_read(regmap, LM95234_REG_STS_FAULT, ®val);218 if (ret)219 return ret;220 mask = (BIT(0) | BIT(1)) << ((channel - 1) << 1);221 *val = !!(regval & mask);222 break;223 case hwmon_temp_max:224 ret = regmap_read(regmap, lm95234_crit_reg(channel), ®val);225 if (ret)226 return ret;227 *val = regval * 1000;228 break;229 case hwmon_temp_max_hyst:230 return lm95234_hyst_get(regmap, lm95234_crit_reg(channel), val);231 case hwmon_temp_crit:232 ret = regmap_read(regmap, LM95234_REG_TCRIT1(channel), ®val);233 if (ret)234 return ret;235 *val = regval * 1000;236 break;237 default:238 return -EOPNOTSUPP;239 }240 return 0;241}242 243static u16 update_intervals[] = { 143, 364, 1000, 2500 };244 245static int lm95234_chip_write(struct device *dev, u32 attr, long val)246{247 struct lm95234_data *data = dev_get_drvdata(dev);248 249 switch (attr) {250 case hwmon_chip_update_interval:251 val = find_closest(val, update_intervals, ARRAY_SIZE(update_intervals));252 return regmap_write(data->regmap, LM95234_REG_CONVRATE, val);253 default:254 return -EOPNOTSUPP;255 }256 return 0;257}258 259static int lm95234_chip_read(struct device *dev, u32 attr, long *val)260{261 struct lm95234_data *data = dev_get_drvdata(dev);262 u32 convrate;263 int ret;264 265 switch (attr) {266 case hwmon_chip_update_interval:267 ret = regmap_read(data->regmap, LM95234_REG_CONVRATE, &convrate);268 if (ret)269 return ret;270 271 *val = update_intervals[convrate & 0x03];272 break;273 default:274 return -EOPNOTSUPP;275 }276 return 0;277}278 279static int lm95234_write(struct device *dev, enum hwmon_sensor_types type,280 u32 attr, int channel, long val)281{282 switch (type) {283 case hwmon_chip:284 return lm95234_chip_write(dev, attr, val);285 case hwmon_temp:286 return lm95234_temp_write(dev, attr, channel, val);287 default:288 return -EOPNOTSUPP;289 }290}291 292static int lm95234_read(struct device *dev, enum hwmon_sensor_types type,293 u32 attr, int channel, long *val)294{295 switch (type) {296 case hwmon_chip:297 return lm95234_chip_read(dev, attr, val);298 case hwmon_temp:299 return lm95234_temp_read(dev, attr, channel, val);300 default:301 return -EOPNOTSUPP;302 }303}304 305static umode_t lm95234_is_visible(const void *_data, enum hwmon_sensor_types type,306 u32 attr, int channel)307{308 const struct lm95234_data *data = _data;309 310 if (data->type == lm95233 && channel > 2)311 return 0;312 313 switch (type) {314 case hwmon_chip:315 switch (attr) {316 case hwmon_chip_update_interval:317 return 0644;318 default:319 break;320 }321 break;322 case hwmon_temp:323 switch (attr) {324 case hwmon_temp_input:325 case hwmon_temp_max_alarm:326 return 0444;327 case hwmon_temp_crit_alarm:328 case hwmon_temp_crit_hyst:329 return (channel && channel < 3) ? 0444 : 0;330 case hwmon_temp_type:331 case hwmon_temp_offset:332 return channel ? 0644 : 0;333 case hwmon_temp_fault:334 return channel ? 0444 : 0;335 case hwmon_temp_max:336 case hwmon_temp_enable:337 return 0644;338 case hwmon_temp_max_hyst:339 return channel ? 0444 : 0644;340 case hwmon_temp_crit:341 return (channel && channel < 3) ? 0644 : 0;342 default:343 break;344 }345 break;346 default:347 break;348 }349 return 0;350}351 352static const struct hwmon_channel_info * const lm95234_info[] = {353 HWMON_CHANNEL_INFO(chip, HWMON_C_UPDATE_INTERVAL),354 HWMON_CHANNEL_INFO(temp,355 HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MAX_HYST |356 HWMON_T_MAX_ALARM | HWMON_T_ENABLE,357 HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MAX_HYST |358 HWMON_T_MAX_ALARM | HWMON_T_FAULT | HWMON_T_TYPE |359 HWMON_T_CRIT | HWMON_T_CRIT_HYST |360 HWMON_T_CRIT_ALARM | HWMON_T_OFFSET | HWMON_T_ENABLE,361 HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MAX_HYST |362 HWMON_T_MAX_ALARM | HWMON_T_FAULT | HWMON_T_TYPE |363 HWMON_T_CRIT | HWMON_T_CRIT_HYST |364 HWMON_T_CRIT_ALARM | HWMON_T_OFFSET | HWMON_T_ENABLE,365 HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MAX_HYST |366 HWMON_T_MAX_ALARM | HWMON_T_FAULT | HWMON_T_TYPE |367 HWMON_T_OFFSET | HWMON_T_ENABLE,368 HWMON_T_INPUT | HWMON_T_MAX | HWMON_T_MAX_HYST |369 HWMON_T_MAX_ALARM | HWMON_T_FAULT | HWMON_T_TYPE |370 HWMON_T_OFFSET | HWMON_T_ENABLE),371 NULL372};373 374static const struct hwmon_ops lm95234_hwmon_ops = {375 .is_visible = lm95234_is_visible,376 .read = lm95234_read,377 .write = lm95234_write,378};379 380static const struct hwmon_chip_info lm95234_chip_info = {381 .ops = &lm95234_hwmon_ops,382 .info = lm95234_info,383};384 385static bool lm95234_volatile_reg(struct device *dev, unsigned int reg)386{387 switch (reg) {388 case LM95234_REG_TEMPH(0) ... LM95234_REG_TEMPH(4):389 case LM95234_REG_TEMPL(0) ... LM95234_REG_TEMPL(4):390 case LM95234_REG_UTEMPH(0) ... LM95234_REG_UTEMPH(3):391 case LM95234_REG_UTEMPL(0) ... LM95234_REG_UTEMPL(3):392 case LM95234_REG_STS_FAULT:393 case LM95234_REG_STS_TCRIT1:394 case LM95234_REG_STS_TCRIT2:395 case LM95234_REG_REM_MODEL_STS:396 return true;397 default:398 return false;399 }400}401 402static bool lm95234_writeable_reg(struct device *dev, unsigned int reg)403{404 switch (reg) {405 case LM95234_REG_CONFIG ... LM95234_REG_FILTER:406 case LM95234_REG_REM_MODEL ... LM95234_REG_OFFSET(3):407 case LM95234_REG_TCRIT1(0) ... LM95234_REG_TCRIT1(4):408 case LM95234_REG_TCRIT2(0) ... LM95234_REG_TCRIT2(1):409 case LM95234_REG_TCRIT_HYST:410 return true;411 default:412 return false;413 }414}415 416static const struct regmap_config lm95234_regmap_config = {417 .reg_bits = 8,418 .val_bits = 8,419 .writeable_reg = lm95234_writeable_reg,420 .volatile_reg = lm95234_volatile_reg,421 .cache_type = REGCACHE_MAPLE,422};423 424static int lm95234_detect(struct i2c_client *client,425 struct i2c_board_info *info)426{427 struct i2c_adapter *adapter = client->adapter;428 int address = client->addr;429 u8 config_mask, model_mask;430 int mfg_id, chip_id, val;431 const char *name;432 433 if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA))434 return -ENODEV;435 436 mfg_id = i2c_smbus_read_byte_data(client, LM95234_REG_MAN_ID);437 if (mfg_id != NATSEMI_MAN_ID)438 return -ENODEV;439 440 chip_id = i2c_smbus_read_byte_data(client, LM95234_REG_CHIP_ID);441 switch (chip_id) {442 case LM95233_CHIP_ID:443 if (address != 0x18 && address != 0x2a && address != 0x2b)444 return -ENODEV;445 config_mask = 0xbf;446 model_mask = 0xf9;447 name = "lm95233";448 break;449 case LM95234_CHIP_ID:450 if (address != 0x18 && address != 0x4d && address != 0x4e)451 return -ENODEV;452 config_mask = 0xbc;453 model_mask = 0xe1;454 name = "lm95234";455 break;456 default:457 return -ENODEV;458 }459 460 val = i2c_smbus_read_byte_data(client, LM95234_REG_STATUS);461 if (val & 0x30)462 return -ENODEV;463 464 val = i2c_smbus_read_byte_data(client, LM95234_REG_CONFIG);465 if (val & config_mask)466 return -ENODEV;467 468 val = i2c_smbus_read_byte_data(client, LM95234_REG_CONVRATE);469 if (val & 0xfc)470 return -ENODEV;471 472 val = i2c_smbus_read_byte_data(client, LM95234_REG_REM_MODEL);473 if (val & model_mask)474 return -ENODEV;475 476 val = i2c_smbus_read_byte_data(client, LM95234_REG_REM_MODEL_STS);477 if (val & model_mask)478 return -ENODEV;479 480 strscpy(info->type, name, I2C_NAME_SIZE);481 return 0;482}483 484static int lm95234_init_client(struct device *dev, struct regmap *regmap)485{486 u32 val, model;487 int ret;488 489 /* start conversion if necessary */490 ret = regmap_clear_bits(regmap, LM95234_REG_CONFIG, 0x40);491 if (ret)492 return ret;493 494 /* If diode type status reports an error, try to fix it */495 ret = regmap_read(regmap, LM95234_REG_REM_MODEL_STS, &val);496 if (ret < 0)497 return ret;498 ret = regmap_read(regmap, LM95234_REG_REM_MODEL, &model);499 if (ret < 0)500 return ret;501 if (model & val) {502 dev_notice(dev,503 "Fixing remote diode type misconfiguration (0x%x)\n",504 val);505 ret = regmap_write(regmap, LM95234_REG_REM_MODEL, model & ~val);506 }507 return ret;508}509 510static int lm95234_probe(struct i2c_client *client)511{512 struct device *dev = &client->dev;513 struct lm95234_data *data;514 struct device *hwmon_dev;515 struct regmap *regmap;516 int err;517 518 data = devm_kzalloc(dev, sizeof(struct lm95234_data), GFP_KERNEL);519 if (!data)520 return -ENOMEM;521 522 data->type = (uintptr_t)i2c_get_match_data(client);523 524 regmap = devm_regmap_init_i2c(client, &lm95234_regmap_config);525 if (IS_ERR(regmap))526 return PTR_ERR(regmap);527 528 data->regmap = regmap;529 mutex_init(&data->update_lock);530 531 /* Initialize the LM95234 chip */532 err = lm95234_init_client(dev, regmap);533 if (err < 0)534 return err;535 536 hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name,537 data, &lm95234_chip_info, NULL);538 return PTR_ERR_OR_ZERO(hwmon_dev);539}540 541/* Driver data (common to all clients) */542static const struct i2c_device_id lm95234_id[] = {543 { "lm95233", lm95233 },544 { "lm95234", lm95234 },545 { }546};547MODULE_DEVICE_TABLE(i2c, lm95234_id);548 549static struct i2c_driver lm95234_driver = {550 .class = I2C_CLASS_HWMON,551 .driver = {552 .name = DRVNAME,553 },554 .probe = lm95234_probe,555 .id_table = lm95234_id,556 .detect = lm95234_detect,557 .address_list = normal_i2c,558};559 560module_i2c_driver(lm95234_driver);561 562MODULE_AUTHOR("Guenter Roeck <linux@roeck-us.net>");563MODULE_DESCRIPTION("LM95233/LM95234 sensor driver");564MODULE_LICENSE("GPL");565