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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * w1_therm.c4 *5 * Copyright (c) 2004 Evgeniy Polyakov <zbr@ioremap.net>6 */7 8#include <asm/types.h>9 10#include <linux/kernel.h>11#include <linux/module.h>12#include <linux/moduleparam.h>13#include <linux/sched.h>14#include <linux/device.h>15#include <linux/types.h>16#include <linux/slab.h>17#include <linux/delay.h>18#include <linux/hwmon.h>19#include <linux/string.h>20#include <linux/jiffies.h>21 22#include <linux/w1.h>23 24#define W1_THERM_DS18S20 0x1025#define W1_THERM_DS1822 0x2226#define W1_THERM_DS18B20 0x2827#define W1_THERM_DS1825 0x3B28#define W1_THERM_DS28EA00 0x4229 30/*31 * Allow the strong pullup to be disabled, but default to enabled.32 * If it was disabled a parasite powered device might not get the require33 * current to do a temperature conversion. If it is enabled parasite powered34 * devices have a better chance of getting the current required.35 * In case the parasite power-detection is not working (seems to be the case36 * for some DS18S20) the strong pullup can also be forced, regardless of the37 * power state of the devices.38 *39 * Summary of options:40 * - strong_pullup = 0 Disable strong pullup completely41 * - strong_pullup = 1 Enable automatic strong pullup detection42 * - strong_pullup = 2 Force strong pullup43 */44static int w1_strong_pullup = 1;45module_param_named(strong_pullup, w1_strong_pullup, int, 0);46 47/* Counter for devices supporting bulk reading */48static u16 bulk_read_device_counter; /* =0 as per C standard */49 50/* This command should be in public header w1.h but is not */51#define W1_RECALL_EEPROM 0xB852 53/* Nb of try for an operation */54#define W1_THERM_MAX_TRY 555 56/* ms delay to retry bus mutex */57#define W1_THERM_RETRY_DELAY 2058 59/* delay in ms to write in EEPROM */60#define W1_THERM_EEPROM_WRITE_DELAY 1061 62#define EEPROM_CMD_WRITE "save" /* cmd for write eeprom sysfs */63#define EEPROM_CMD_READ "restore" /* cmd for read eeprom sysfs */64#define BULK_TRIGGER_CMD "trigger" /* cmd to trigger a bulk read */65 66#define MIN_TEMP -55 /* min temperature that can be measured */67#define MAX_TEMP 125 /* max temperature that can be measured */68 69/* Allowed values for sysfs conv_time attribute */70#define CONV_TIME_DEFAULT 071#define CONV_TIME_MEASURE 172 73/* Bits in sysfs "features" value */74#define W1_THERM_CHECK_RESULT 1 /* Enable conversion success check */75#define W1_THERM_POLL_COMPLETION 2 /* Poll for conversion completion */76#define W1_THERM_FEATURES_MASK 3 /* All values mask */77 78/* Poll period in milliseconds. Should be less then a shortest operation on the device */79#define W1_POLL_PERIOD 3280#define W1_POLL_CONVERT_TEMP 2000 /* Timeout for W1_CONVERT_TEMP, ms */81#define W1_POLL_RECALL_EEPROM 500 /* Timeout for W1_RECALL_EEPROM, ms*/82 83/* Masks for resolution functions, work with all devices */84/* Bit mask for config register for all devices, bits 7,6,5 */85#define W1_THERM_RESOLUTION_MASK 0xE086/* Bit offset of resolution in config register for all devices */87#define W1_THERM_RESOLUTION_SHIFT 588/* Bit offset of resolution in config register for all devices */89#define W1_THERM_RESOLUTION_SHIFT 590/* Add this to bit value to get resolution */91#define W1_THERM_RESOLUTION_MIN 992/* Maximum allowed value */93#define W1_THERM_RESOLUTION_MAX 1494 95/* Helpers Macros */96 97/*98 * return a pointer on the slave w1_therm_family_converter struct:99 * always test family data existence before using this macro100 */101#define SLAVE_SPECIFIC_FUNC(sl) \102 (((struct w1_therm_family_data *)(sl->family_data))->specific_functions)103 104/*105 * return the power mode of the sl slave : 1-ext, 0-parasite, <0 unknown106 * always test family data existence before using this macro107 */108#define SLAVE_POWERMODE(sl) \109 (((struct w1_therm_family_data *)(sl->family_data))->external_powered)110 111/*112 * return the resolution in bit of the sl slave : <0 unknown113 * always test family data existence before using this macro114 */115#define SLAVE_RESOLUTION(sl) \116 (((struct w1_therm_family_data *)(sl->family_data))->resolution)117 118/*119 * return the conv_time_override of the sl slave120 * always test family data existence before using this macro121 */122 #define SLAVE_CONV_TIME_OVERRIDE(sl) \123 (((struct w1_therm_family_data *)(sl->family_data))->conv_time_override)124 125/*126 * return the features of the sl slave127 * always test family data existence before using this macro128 */129 #define SLAVE_FEATURES(sl) \130 (((struct w1_therm_family_data *)(sl->family_data))->features)131 132/*133 * return whether or not a converT command has been issued to the slave134 * * 0: no bulk read is pending135 * * -1: conversion is in progress136 * * 1: conversion done, result to be read137 */138#define SLAVE_CONVERT_TRIGGERED(sl) \139 (((struct w1_therm_family_data *)(sl->family_data))->convert_triggered)140 141/* return the address of the refcnt in the family data */142#define THERM_REFCNT(family_data) \143 (&((struct w1_therm_family_data *)family_data)->refcnt)144 145/* Structs definition */146 147/**148 * struct w1_therm_family_converter - bind device specific functions149 * @broken: flag for non-registred families150 * @reserved: not used here151 * @f: pointer to the device binding structure152 * @convert: pointer to the device conversion function153 * @get_conversion_time: pointer to the device conversion time function154 * @set_resolution: pointer to the device set_resolution function155 * @get_resolution: pointer to the device get_resolution function156 * @write_data: pointer to the device writing function (2 or 3 bytes)157 * @bulk_read: true if device family support bulk read, false otherwise158 */159struct w1_therm_family_converter {160 u8 broken;161 u16 reserved;162 struct w1_family *f;163 int (*convert)(u8 rom[9]);164 int (*get_conversion_time)(struct w1_slave *sl);165 int (*set_resolution)(struct w1_slave *sl, int val);166 int (*get_resolution)(struct w1_slave *sl);167 int (*write_data)(struct w1_slave *sl, const u8 *data);168 bool bulk_read;169};170 171/**172 * struct w1_therm_family_data - device data173 * @rom: ROM device id (64bit Lasered ROM code + 1 CRC byte)174 * @refcnt: ref count175 * @external_powered: 1 device powered externally,176 * 0 device parasite powered,177 * -x error or undefined178 * @resolution: current device resolution179 * @convert_triggered: conversion state of the device180 * @conv_time_override: user selected conversion time or CONV_TIME_DEFAULT181 * @features: bit mask - enable temperature validity check, poll for completion182 * @specific_functions: pointer to struct of device specific function183 */184struct w1_therm_family_data {185 uint8_t rom[9];186 atomic_t refcnt;187 int external_powered;188 int resolution;189 int convert_triggered;190 int conv_time_override;191 unsigned int features;192 struct w1_therm_family_converter *specific_functions;193};194 195/**196 * struct therm_info - store temperature reading197 * @rom: read device data (8 data bytes + 1 CRC byte)198 * @crc: computed crc from rom199 * @verdict: 1 crc checked, 0 crc not matching200 */201struct therm_info {202 u8 rom[9];203 u8 crc;204 u8 verdict;205};206 207/* Hardware Functions declaration */208 209/**210 * reset_select_slave() - reset and select a slave211 * @sl: the slave to select212 *213 * Resets the bus and select the slave by sending a ROM MATCH cmd214 * w1_reset_select_slave() from w1_io.c could not be used here because215 * it sent a SKIP ROM command if only one device is on the line.216 * At the beginning of the such process, sl->master->slave_count is 1 even if217 * more devices are on the line, causing collision on the line.218 *219 * Context: The w1 master lock must be held.220 *221 * Return: 0 if success, negative kernel error code otherwise.222 */223static int reset_select_slave(struct w1_slave *sl);224 225/**226 * convert_t() - Query the device for temperature conversion and read227 * @sl: pointer to the slave to read228 * @info: pointer to a structure to store the read results229 *230 * Return: 0 if success, -kernel error code otherwise231 */232static int convert_t(struct w1_slave *sl, struct therm_info *info);233 234/**235 * read_scratchpad() - read the data in device RAM236 * @sl: pointer to the slave to read237 * @info: pointer to a structure to store the read results238 *239 * Return: 0 if success, -kernel error code otherwise240 */241static int read_scratchpad(struct w1_slave *sl, struct therm_info *info);242 243/**244 * write_scratchpad() - write nb_bytes in the device RAM245 * @sl: pointer to the slave to write in246 * @data: pointer to an array of 3 bytes, as 3 bytes MUST be written247 * @nb_bytes: number of bytes to be written (2 for DS18S20, 3 otherwise)248 *249 * Return: 0 if success, -kernel error code otherwise250 */251static int write_scratchpad(struct w1_slave *sl, const u8 *data, u8 nb_bytes);252 253/**254 * copy_scratchpad() - Copy the content of scratchpad in device EEPROM255 * @sl: slave involved256 *257 * Return: 0 if success, -kernel error code otherwise258 */259static int copy_scratchpad(struct w1_slave *sl);260 261/**262 * recall_eeprom() - Restore EEPROM data to device RAM263 * @sl: slave involved264 *265 * Return: 0 if success, -kernel error code otherwise266 */267static int recall_eeprom(struct w1_slave *sl);268 269/**270 * read_powermode() - Query the power mode of the slave271 * @sl: slave to retrieve the power mode272 *273 * Ask the device to get its power mode (external or parasite)274 * and store the power status in the &struct w1_therm_family_data.275 *276 * Return:277 * * 0 parasite powered device278 * * 1 externally powered device279 * * <0 kernel error code280 */281static int read_powermode(struct w1_slave *sl);282 283/**284 * trigger_bulk_read() - function to trigger a bulk read on the bus285 * @dev_master: the device master of the bus286 *287 * Send a SKIP ROM follow by a CONVERT T command on the bus.288 * It also set the status flag in each slave &struct w1_therm_family_data289 * to signal that a conversion is in progress.290 *291 * Return: 0 if success, -kernel error code otherwise292 */293static int trigger_bulk_read(struct w1_master *dev_master);294 295/* Sysfs interface declaration */296 297static ssize_t w1_slave_show(struct device *device,298 struct device_attribute *attr, char *buf);299 300static ssize_t w1_slave_store(struct device *device,301 struct device_attribute *attr, const char *buf, size_t size);302 303static ssize_t w1_seq_show(struct device *device,304 struct device_attribute *attr, char *buf);305 306static ssize_t temperature_show(struct device *device,307 struct device_attribute *attr, char *buf);308 309static ssize_t ext_power_show(struct device *device,310 struct device_attribute *attr, char *buf);311 312static ssize_t resolution_show(struct device *device,313 struct device_attribute *attr, char *buf);314 315static ssize_t resolution_store(struct device *device,316 struct device_attribute *attr, const char *buf, size_t size);317 318static ssize_t eeprom_cmd_store(struct device *device,319 struct device_attribute *attr, const char *buf, size_t size);320 321static ssize_t alarms_store(struct device *device,322 struct device_attribute *attr, const char *buf, size_t size);323 324static ssize_t alarms_show(struct device *device,325 struct device_attribute *attr, char *buf);326 327static ssize_t therm_bulk_read_store(struct device *device,328 struct device_attribute *attr, const char *buf, size_t size);329 330static ssize_t therm_bulk_read_show(struct device *device,331 struct device_attribute *attr, char *buf);332 333static ssize_t conv_time_show(struct device *device,334 struct device_attribute *attr, char *buf);335 336static ssize_t conv_time_store(struct device *device,337 struct device_attribute *attr, const char *buf,338 size_t size);339 340static ssize_t features_show(struct device *device,341 struct device_attribute *attr, char *buf);342 343static ssize_t features_store(struct device *device,344 struct device_attribute *attr, const char *buf,345 size_t size);346/* Attributes declarations */347 348static DEVICE_ATTR_RW(w1_slave);349static DEVICE_ATTR_RO(w1_seq);350static DEVICE_ATTR_RO(temperature);351static DEVICE_ATTR_RO(ext_power);352static DEVICE_ATTR_RW(resolution);353static DEVICE_ATTR_WO(eeprom_cmd);354static DEVICE_ATTR_RW(alarms);355static DEVICE_ATTR_RW(conv_time);356static DEVICE_ATTR_RW(features);357 358static DEVICE_ATTR_RW(therm_bulk_read); /* attribut at master level */359 360/* Interface Functions declaration */361 362/**363 * w1_therm_add_slave() - Called when a new slave is discovered364 * @sl: slave just discovered by the master.365 *366 * Called by the master when the slave is discovered on the bus. Used to367 * initialize slave state before the beginning of any communication.368 *369 * Return: 0 - If success, negative kernel code otherwise370 */371static int w1_therm_add_slave(struct w1_slave *sl);372 373/**374 * w1_therm_remove_slave() - Called when a slave is removed375 * @sl: slave to be removed.376 *377 * Called by the master when the slave is considered not to be on the bus378 * anymore. Used to free memory.379 */380static void w1_therm_remove_slave(struct w1_slave *sl);381 382/* Family attributes */383 384static struct attribute *w1_therm_attrs[] = {385 &dev_attr_w1_slave.attr,386 &dev_attr_temperature.attr,387 &dev_attr_ext_power.attr,388 &dev_attr_resolution.attr,389 &dev_attr_eeprom_cmd.attr,390 &dev_attr_alarms.attr,391 &dev_attr_conv_time.attr,392 &dev_attr_features.attr,393 NULL,394};395 396static struct attribute *w1_ds18s20_attrs[] = {397 &dev_attr_w1_slave.attr,398 &dev_attr_temperature.attr,399 &dev_attr_ext_power.attr,400 &dev_attr_eeprom_cmd.attr,401 &dev_attr_alarms.attr,402 &dev_attr_conv_time.attr,403 &dev_attr_features.attr,404 NULL,405};406 407static struct attribute *w1_ds28ea00_attrs[] = {408 &dev_attr_w1_slave.attr,409 &dev_attr_w1_seq.attr,410 &dev_attr_temperature.attr,411 &dev_attr_ext_power.attr,412 &dev_attr_resolution.attr,413 &dev_attr_eeprom_cmd.attr,414 &dev_attr_alarms.attr,415 &dev_attr_conv_time.attr,416 &dev_attr_features.attr,417 NULL,418};419 420/* Attribute groups */421 422ATTRIBUTE_GROUPS(w1_therm);423ATTRIBUTE_GROUPS(w1_ds18s20);424ATTRIBUTE_GROUPS(w1_ds28ea00);425 426#if IS_REACHABLE(CONFIG_HWMON)427static int w1_read_temp(struct device *dev, u32 attr, int channel,428 long *val);429 430static umode_t w1_is_visible(const void *_data, enum hwmon_sensor_types type,431 u32 attr, int channel)432{433 return attr == hwmon_temp_input ? 0444 : 0;434}435 436static int w1_read(struct device *dev, enum hwmon_sensor_types type,437 u32 attr, int channel, long *val)438{439 switch (type) {440 case hwmon_temp:441 return w1_read_temp(dev, attr, channel, val);442 default:443 return -EOPNOTSUPP;444 }445}446 447static const u32 w1_temp_config[] = {448 HWMON_T_INPUT,449 0450};451 452static const struct hwmon_channel_info w1_temp = {453 .type = hwmon_temp,454 .config = w1_temp_config,455};456 457static const struct hwmon_channel_info * const w1_info[] = {458 &w1_temp,459 NULL460};461 462static const struct hwmon_ops w1_hwmon_ops = {463 .is_visible = w1_is_visible,464 .read = w1_read,465};466 467static const struct hwmon_chip_info w1_chip_info = {468 .ops = &w1_hwmon_ops,469 .info = w1_info,470};471#define W1_CHIPINFO (&w1_chip_info)472#else473#define W1_CHIPINFO NULL474#endif475 476/* Family operations */477 478static const struct w1_family_ops w1_therm_fops = {479 .add_slave = w1_therm_add_slave,480 .remove_slave = w1_therm_remove_slave,481 .groups = w1_therm_groups,482 .chip_info = W1_CHIPINFO,483};484 485static const struct w1_family_ops w1_ds18s20_fops = {486 .add_slave = w1_therm_add_slave,487 .remove_slave = w1_therm_remove_slave,488 .groups = w1_ds18s20_groups,489 .chip_info = W1_CHIPINFO,490};491 492static const struct w1_family_ops w1_ds28ea00_fops = {493 .add_slave = w1_therm_add_slave,494 .remove_slave = w1_therm_remove_slave,495 .groups = w1_ds28ea00_groups,496 .chip_info = W1_CHIPINFO,497};498 499/* Family binding operations struct */500 501static struct w1_family w1_therm_family_DS18S20 = {502 .fid = W1_THERM_DS18S20,503 .fops = &w1_ds18s20_fops,504};505 506static struct w1_family w1_therm_family_DS18B20 = {507 .fid = W1_THERM_DS18B20,508 .fops = &w1_therm_fops,509};510 511static struct w1_family w1_therm_family_DS1822 = {512 .fid = W1_THERM_DS1822,513 .fops = &w1_therm_fops,514};515 516static struct w1_family w1_therm_family_DS28EA00 = {517 .fid = W1_THERM_DS28EA00,518 .fops = &w1_ds28ea00_fops,519};520 521static struct w1_family w1_therm_family_DS1825 = {522 .fid = W1_THERM_DS1825,523 .fops = &w1_therm_fops,524};525 526/* Device dependent func */527 528static inline int w1_DS18B20_convert_time(struct w1_slave *sl)529{530 int ret;531 532 if (!sl->family_data)533 return -ENODEV; /* device unknown */534 535 if (SLAVE_CONV_TIME_OVERRIDE(sl) != CONV_TIME_DEFAULT)536 return SLAVE_CONV_TIME_OVERRIDE(sl);537 538 /* Return the conversion time, depending on resolution,539 * select maximum conversion time among all compatible devices540 */541 switch (SLAVE_RESOLUTION(sl)) {542 case 9:543 ret = 95;544 break;545 case 10:546 ret = 190;547 break;548 case 11:549 ret = 375;550 break;551 case 12:552 ret = 750;553 break;554 case 13:555 ret = 850; /* GX20MH01 only. Datasheet says 500ms, but that's not enough. */556 break;557 case 14:558 ret = 1600; /* GX20MH01 only. Datasheet says 1000ms - not enough */559 break;560 default:561 ret = 750;562 }563 return ret;564}565 566static inline int w1_DS18S20_convert_time(struct w1_slave *sl)567{568 if (!sl->family_data)569 return -ENODEV; /* device unknown */570 571 if (SLAVE_CONV_TIME_OVERRIDE(sl) == CONV_TIME_DEFAULT)572 return 750; /* default for DS18S20 */573 else574 return SLAVE_CONV_TIME_OVERRIDE(sl);575}576 577static inline int w1_DS1825_convert_time(struct w1_slave *sl)578{579 int ret;580 581 if (!sl->family_data)582 return -ENODEV; /* device unknown */583 584 if (SLAVE_CONV_TIME_OVERRIDE(sl) != CONV_TIME_DEFAULT)585 return SLAVE_CONV_TIME_OVERRIDE(sl);586 587 /* Return the conversion time, depending on resolution,588 * select maximum conversion time among all compatible devices589 */590 switch (SLAVE_RESOLUTION(sl)) {591 case 9:592 ret = 95;593 break;594 case 10:595 ret = 190;596 break;597 case 11:598 ret = 375;599 break;600 case 12:601 ret = 750;602 break;603 case 14:604 ret = 100; /* MAX31850 only. Datasheet says 100ms */605 break;606 default:607 ret = 750;608 }609 return ret;610}611 612static inline int w1_DS18B20_write_data(struct w1_slave *sl,613 const u8 *data)614{615 return write_scratchpad(sl, data, 3);616}617 618static inline int w1_DS18S20_write_data(struct w1_slave *sl,619 const u8 *data)620{621 /* No config register */622 return write_scratchpad(sl, data, 2);623}624 625static inline int w1_DS18B20_set_resolution(struct w1_slave *sl, int val)626{627 int ret;628 struct therm_info info, info2;629 630 /* DS18B20 resolution is 9 to 12 bits */631 /* GX20MH01 resolution is 9 to 14 bits */632 /* MAX31850 resolution is fixed 14 bits */633 if (val < W1_THERM_RESOLUTION_MIN || val > W1_THERM_RESOLUTION_MAX)634 return -EINVAL;635 636 /* Calc bit value from resolution */637 val = (val - W1_THERM_RESOLUTION_MIN) << W1_THERM_RESOLUTION_SHIFT;638 639 /*640 * Read the scratchpad to change only the required bits641 * (bit5 & bit 6 from byte 4)642 */643 ret = read_scratchpad(sl, &info);644 645 if (ret)646 return ret;647 648 649 info.rom[4] &= ~W1_THERM_RESOLUTION_MASK;650 info.rom[4] |= val;651 652 /* Write data in the device RAM */653 ret = w1_DS18B20_write_data(sl, info.rom + 2);654 if (ret)655 return ret;656 657 /* Have to read back the resolution to verify an actual value658 * GX20MH01 and DS18B20 are indistinguishable by family number, but resolutions differ659 * Some DS18B20 clones don't support resolution change660 */661 ret = read_scratchpad(sl, &info2);662 if (ret)663 /* Scratchpad read fail */664 return ret;665 666 if ((info2.rom[4] & W1_THERM_RESOLUTION_MASK) == (info.rom[4] & W1_THERM_RESOLUTION_MASK))667 return 0;668 669 /* Resolution verify error */670 return -EIO;671}672 673static inline int w1_DS18B20_get_resolution(struct w1_slave *sl)674{675 int ret;676 int resolution;677 struct therm_info info;678 679 ret = read_scratchpad(sl, &info);680 681 if (ret)682 return ret;683 684 resolution = ((info.rom[4] & W1_THERM_RESOLUTION_MASK) >> W1_THERM_RESOLUTION_SHIFT)685 + W1_THERM_RESOLUTION_MIN;686 /* GX20MH01 has one special case:687 * >=14 means 14 bits when getting resolution from bit value.688 * MAX31850 delivers fixed 15 and has 14 bits.689 * Other devices have no more then 12 bits.690 */691 if (resolution > W1_THERM_RESOLUTION_MAX)692 resolution = W1_THERM_RESOLUTION_MAX;693 694 return resolution;695}696 697/**698 * w1_DS18B20_convert_temp() - temperature computation for DS18B20699 * @rom: data read from device RAM (8 data bytes + 1 CRC byte)700 *701 * Can be called for any DS18B20 compliant device.702 *703 * Return: value in millidegrees Celsius.704 */705static inline int w1_DS18B20_convert_temp(u8 rom[9])706{707 u16 bv;708 s16 t;709 710 /* Signed 16-bit value to unsigned, cpu order */711 bv = le16_to_cpup((__le16 *)rom);712 713 /* Config register bit R2 = 1 - GX20MH01 in 13 or 14 bit resolution mode */714 if (rom[4] & 0x80) {715 /* Insert two temperature bits from config register */716 /* Avoid arithmetic shift of signed value */717 bv = (bv << 2) | (rom[4] & 3);718 t = (s16) bv; /* Degrees, lowest bit is 2^-6 */719 return (int)t * 1000 / 64; /* Sign-extend to int; millidegrees */720 }721 t = (s16)bv; /* Degrees, lowest bit is 2^-4 */722 return (int)t * 1000 / 16; /* Sign-extend to int; millidegrees */723}724 725/**726 * w1_DS18S20_convert_temp() - temperature computation for DS18S20727 * @rom: data read from device RAM (8 data bytes + 1 CRC byte)728 *729 * Can be called for any DS18S20 compliant device.730 *731 * Return: value in millidegrees Celsius.732 */733static inline int w1_DS18S20_convert_temp(u8 rom[9])734{735 int t, h;736 737 if (!rom[7]) {738 pr_debug("%s: Invalid argument for conversion\n", __func__);739 return 0;740 }741 742 if (rom[1] == 0)743 t = ((s32)rom[0] >> 1)*1000;744 else745 t = 1000*(-1*(s32)(0x100-rom[0]) >> 1);746 747 t -= 250;748 h = 1000*((s32)rom[7] - (s32)rom[6]);749 h /= (s32)rom[7];750 t += h;751 752 return t;753}754 755/**756 * w1_DS1825_convert_temp() - temperature computation for DS1825757 * @rom: data read from device RAM (8 data bytes + 1 CRC byte)758 *759 * Can be called for any DS1825 compliant device.760 * Is used by MAX31850, too761 *762 * Return: value in millidegrees Celsius.763 */764 765static inline int w1_DS1825_convert_temp(u8 rom[9])766{767 u16 bv;768 s16 t;769 770 /* Signed 16-bit value to unsigned, cpu order */771 bv = le16_to_cpup((__le16 *)rom);772 773 /* Config register bit 7 = 1 - MA31850 found, 14 bit resolution */774 if (rom[4] & 0x80) {775 /* Mask out bits 0 (Fault) and 1 (Reserved) */776 /* Avoid arithmetic shift of signed value */777 bv = (bv & 0xFFFC); /* Degrees, lowest 4 bits are 2^-1, 2^-2 and 2 zero bits */778 }779 t = (s16)bv; /* Degrees, lowest bit is 2^-4 */780 return (int)t * 1000 / 16; /* Sign-extend to int; millidegrees */781}782 783/* Device capability description */784/* GX20MH01 device shares family number and structure with DS18B20 */785 786static struct w1_therm_family_converter w1_therm_families[] = {787 {788 .f = &w1_therm_family_DS18S20,789 .convert = w1_DS18S20_convert_temp,790 .get_conversion_time = w1_DS18S20_convert_time,791 .set_resolution = NULL, /* no config register */792 .get_resolution = NULL, /* no config register */793 .write_data = w1_DS18S20_write_data,794 .bulk_read = true795 },796 {797 .f = &w1_therm_family_DS1822,798 .convert = w1_DS18B20_convert_temp,799 .get_conversion_time = w1_DS18B20_convert_time,800 .set_resolution = w1_DS18B20_set_resolution,801 .get_resolution = w1_DS18B20_get_resolution,802 .write_data = w1_DS18B20_write_data,803 .bulk_read = true804 },805 {806 /* Also used for GX20MH01 */807 .f = &w1_therm_family_DS18B20,808 .convert = w1_DS18B20_convert_temp,809 .get_conversion_time = w1_DS18B20_convert_time,810 .set_resolution = w1_DS18B20_set_resolution,811 .get_resolution = w1_DS18B20_get_resolution,812 .write_data = w1_DS18B20_write_data,813 .bulk_read = true814 },815 {816 .f = &w1_therm_family_DS28EA00,817 .convert = w1_DS18B20_convert_temp,818 .get_conversion_time = w1_DS18B20_convert_time,819 .set_resolution = w1_DS18B20_set_resolution,820 .get_resolution = w1_DS18B20_get_resolution,821 .write_data = w1_DS18B20_write_data,822 .bulk_read = false823 },824 {825 /* Also used for MAX31850 */826 .f = &w1_therm_family_DS1825,827 .convert = w1_DS1825_convert_temp,828 .get_conversion_time = w1_DS1825_convert_time,829 .set_resolution = w1_DS18B20_set_resolution,830 .get_resolution = w1_DS18B20_get_resolution,831 .write_data = w1_DS18B20_write_data,832 .bulk_read = true833 }834};835 836/* Helpers Functions */837 838/**839 * device_family() - Retrieve a pointer on &struct w1_therm_family_converter840 * @sl: slave to retrieve the device specific structure841 *842 * Return: pointer to the slaves's family converter, NULL if not known843 */844static struct w1_therm_family_converter *device_family(struct w1_slave *sl)845{846 struct w1_therm_family_converter *ret = NULL;847 int i;848 849 for (i = 0; i < ARRAY_SIZE(w1_therm_families); ++i) {850 if (w1_therm_families[i].f->fid == sl->family->fid) {851 ret = &w1_therm_families[i];852 break;853 }854 }855 return ret;856}857 858/**859 * bus_mutex_lock() - Acquire the mutex860 * @lock: w1 bus mutex to acquire861 *862 * It try to acquire the mutex W1_THERM_MAX_TRY times and wait863 * W1_THERM_RETRY_DELAY between 2 attempts.864 *865 * Return: true is mutex is acquired and lock, false otherwise866 */867static inline bool bus_mutex_lock(struct mutex *lock)868{869 int max_trying = W1_THERM_MAX_TRY;870 871 /* try to acquire the mutex, if not, sleep retry_delay before retry) */872 while (mutex_lock_interruptible(lock) != 0 && max_trying > 0) {873 unsigned long sleep_rem;874 875 sleep_rem = msleep_interruptible(W1_THERM_RETRY_DELAY);876 if (!sleep_rem)877 max_trying--;878 }879 880 if (!max_trying)881 return false; /* Didn't acquire the bus mutex */882 883 return true;884}885 886/**887 * check_family_data() - Check if family data and specific functions are present888 * @sl: W1 device data889 *890 * Return: 0 - OK, negative value - error891 */892static int check_family_data(struct w1_slave *sl)893{894 if ((!sl->family_data) || (!SLAVE_SPECIFIC_FUNC(sl))) {895 dev_info(&sl->dev,896 "%s: Device is not supported by the driver\n", __func__);897 return -EINVAL; /* No device family */898 }899 return 0;900}901 902/**903 * bulk_read_support() - check if slave support bulk read904 * @sl: device to check the ability905 *906 * Return: true if bulk read is supported, false if not or error907 */908static inline bool bulk_read_support(struct w1_slave *sl)909{910 if (SLAVE_SPECIFIC_FUNC(sl))911 return SLAVE_SPECIFIC_FUNC(sl)->bulk_read;912 913 dev_info(&sl->dev,914 "%s: Device not supported by the driver\n", __func__);915 916 return false; /* No device family */917}918 919/**920 * conversion_time() - get the Tconv for the slave921 * @sl: device to get the conversion time922 *923 * On device supporting resolution settings, conversion time depend924 * on the resolution setting. This helper function get the slave timing,925 * depending on its current setting.926 *927 * Return: conversion time in ms, negative values are kernel error code928 */929static inline int conversion_time(struct w1_slave *sl)930{931 if (SLAVE_SPECIFIC_FUNC(sl))932 return SLAVE_SPECIFIC_FUNC(sl)->get_conversion_time(sl);933 934 dev_info(&sl->dev,935 "%s: Device not supported by the driver\n", __func__);936 937 return -ENODEV; /* No device family */938}939 940/**941 * temperature_from_RAM() - Convert the read info to temperature942 * @sl: device that sent the RAM data943 * @rom: read value on the slave device RAM944 *945 * Device dependent, the function bind the correct computation method.946 *947 * Return: temperature in 1/1000degC, 0 on error.948 */949static inline int temperature_from_RAM(struct w1_slave *sl, u8 rom[9])950{951 if (SLAVE_SPECIFIC_FUNC(sl))952 return SLAVE_SPECIFIC_FUNC(sl)->convert(rom);953 954 dev_info(&sl->dev,955 "%s: Device not supported by the driver\n", __func__);956 957 return 0; /* No device family */958}959 960/**961 * int_to_short() - Safe casting of int to short962 *963 * @i: integer to be converted to short964 *965 * Device register use 1 byte to store signed integer.966 * This helper function convert the int in a signed short,967 * using the min/max values that device can measure as limits.968 * min/max values are defined by macro.969 *970 * Return: a short in the range of min/max value971 */972static inline s8 int_to_short(int i)973{974 /* Prepare to cast to short by eliminating out of range values */975 i = clamp(i, MIN_TEMP, MAX_TEMP);976 return (s8) i;977}978 979/* Interface Functions */980 981static int w1_therm_add_slave(struct w1_slave *sl)982{983 struct w1_therm_family_converter *sl_family_conv;984 985 /* Allocate memory */986 sl->family_data = kzalloc(sizeof(struct w1_therm_family_data),987 GFP_KERNEL);988 if (!sl->family_data)989 return -ENOMEM;990 991 atomic_set(THERM_REFCNT(sl->family_data), 1);992 993 /* Get a pointer to the device specific function struct */994 sl_family_conv = device_family(sl);995 if (!sl_family_conv) {996 kfree(sl->family_data);997 return -ENODEV;998 }999 /* save this pointer to the device structure */1000 SLAVE_SPECIFIC_FUNC(sl) = sl_family_conv;1001 1002 if (bulk_read_support(sl)) {1003 /*1004 * add the sys entry to trigger bulk_read1005 * at master level only the 1st time1006 */1007 if (!bulk_read_device_counter) {1008 int err = device_create_file(&sl->master->dev,1009 &dev_attr_therm_bulk_read);1010 1011 if (err)1012 dev_warn(&sl->dev,1013 "%s: Device has been added, but bulk read is unavailable. err=%d\n",1014 __func__, err);1015 }1016 /* Increment the counter */1017 bulk_read_device_counter++;1018 }1019 1020 /* Getting the power mode of the device {external, parasite} */1021 SLAVE_POWERMODE(sl) = read_powermode(sl);1022 1023 if (SLAVE_POWERMODE(sl) < 0) {1024 /* no error returned as device has been added */1025 dev_warn(&sl->dev,1026 "%s: Device has been added, but power_mode may be corrupted. err=%d\n",1027 __func__, SLAVE_POWERMODE(sl));1028 }1029 1030 /* Getting the resolution of the device */1031 if (SLAVE_SPECIFIC_FUNC(sl)->get_resolution) {1032 SLAVE_RESOLUTION(sl) =1033 SLAVE_SPECIFIC_FUNC(sl)->get_resolution(sl);1034 if (SLAVE_RESOLUTION(sl) < 0) {1035 /* no error returned as device has been added */1036 dev_warn(&sl->dev,1037 "%s:Device has been added, but resolution may be corrupted. err=%d\n",1038 __func__, SLAVE_RESOLUTION(sl));1039 }1040 }1041 1042 /* Finally initialize convert_triggered flag */1043 SLAVE_CONVERT_TRIGGERED(sl) = 0;1044 1045 return 0;1046}1047 1048static void w1_therm_remove_slave(struct w1_slave *sl)1049{1050 int refcnt = atomic_sub_return(1, THERM_REFCNT(sl->family_data));1051 1052 if (bulk_read_support(sl)) {1053 bulk_read_device_counter--;1054 /* Delete the entry if no more device support the feature */1055 if (!bulk_read_device_counter)1056 device_remove_file(&sl->master->dev,1057 &dev_attr_therm_bulk_read);1058 }1059 1060 while (refcnt) {1061 msleep(1000);1062 refcnt = atomic_read(THERM_REFCNT(sl->family_data));1063 }1064 kfree(sl->family_data);1065 sl->family_data = NULL;1066}1067 1068/* Hardware Functions */1069 1070/* Safe version of reset_select_slave - avoid using the one in w_io.c */1071static int reset_select_slave(struct w1_slave *sl)1072{1073 u8 match[9] = { W1_MATCH_ROM, };1074 u64 rn = le64_to_cpu(*((u64 *)&sl->reg_num));1075 1076 if (w1_reset_bus(sl->master))1077 return -ENODEV;1078 1079 memcpy(&match[1], &rn, 8);1080 w1_write_block(sl->master, match, 9);1081 1082 return 0;1083}1084 1085/**1086 * w1_poll_completion - Poll for operation completion, with timeout1087 * @dev_master: the device master of the bus1088 * @tout_ms: timeout in milliseconds1089 *1090 * The device is answering 0's while an operation is in progress and 1's after it completes1091 * Timeout may happen if the previous command was not recognised due to a line noise1092 *1093 * Return: 0 - OK, negative error - timeout1094 */1095static int w1_poll_completion(struct w1_master *dev_master, int tout_ms)1096{1097 int i;1098 1099 for (i = 0; i < tout_ms/W1_POLL_PERIOD; i++) {1100 /* Delay is before poll, for device to recognize a command */1101 msleep(W1_POLL_PERIOD);1102 1103 /* Compare all 8 bits to mitigate a noise on the bus */1104 if (w1_read_8(dev_master) == 0xFF)1105 break;1106 }1107 if (i == tout_ms/W1_POLL_PERIOD)1108 return -EIO;1109 1110 return 0;1111}1112 1113static int convert_t(struct w1_slave *sl, struct therm_info *info)1114{1115 struct w1_master *dev_master = sl->master;1116 int max_trying = W1_THERM_MAX_TRY;1117 int t_conv;1118 int ret = -ENODEV;1119 bool strong_pullup;1120 1121 if (!sl->family_data)1122 goto error;1123 1124 strong_pullup = (w1_strong_pullup == 2 ||1125 (!SLAVE_POWERMODE(sl) &&1126 w1_strong_pullup));1127 1128 if (strong_pullup && SLAVE_FEATURES(sl) & W1_THERM_POLL_COMPLETION) {1129 dev_warn(&sl->dev,1130 "%s: Disabling W1_THERM_POLL_COMPLETION in parasite power mode.\n",1131 __func__);1132 SLAVE_FEATURES(sl) &= ~W1_THERM_POLL_COMPLETION;1133 }1134 1135 /* get conversion duration device and id dependent */1136 t_conv = conversion_time(sl);1137 1138 memset(info->rom, 0, sizeof(info->rom));1139 1140 /* prevent the slave from going away in sleep */1141 atomic_inc(THERM_REFCNT(sl->family_data));1142 1143 if (!bus_mutex_lock(&dev_master->bus_mutex)) {1144 ret = -EAGAIN; /* Didn't acquire the mutex */1145 goto dec_refcnt;1146 }1147 1148 while (max_trying-- && ret) { /* ret should be 0 */1149 1150 info->verdict = 0;1151 info->crc = 0;1152 /* safe version to select slave */1153 if (!reset_select_slave(sl)) {1154 unsigned long sleep_rem;1155 1156 /* 750ms strong pullup (or delay) after the convert */1157 if (strong_pullup)1158 w1_next_pullup(dev_master, t_conv);1159 1160 w1_write_8(dev_master, W1_CONVERT_TEMP);1161 1162 if (SLAVE_FEATURES(sl) & W1_THERM_POLL_COMPLETION) {1163 ret = w1_poll_completion(dev_master, W1_POLL_CONVERT_TEMP);1164 if (ret) {1165 dev_dbg(&sl->dev, "%s: Timeout\n", __func__);1166 goto mt_unlock;1167 }1168 mutex_unlock(&dev_master->bus_mutex);1169 } else if (!strong_pullup) { /*no device need pullup */1170 sleep_rem = msleep_interruptible(t_conv);1171 if (sleep_rem != 0) {1172 ret = -EINTR;1173 goto mt_unlock;1174 }1175 mutex_unlock(&dev_master->bus_mutex);1176 } else { /*some device need pullup */1177 mutex_unlock(&dev_master->bus_mutex);1178 sleep_rem = msleep_interruptible(t_conv);1179 if (sleep_rem != 0) {1180 ret = -EINTR;1181 goto dec_refcnt;1182 }1183 }1184 ret = read_scratchpad(sl, info);1185 1186 /* If enabled, check for conversion success */1187 if ((SLAVE_FEATURES(sl) & W1_THERM_CHECK_RESULT) &&1188 (info->rom[6] == 0xC) &&1189 ((info->rom[1] == 0x5 && info->rom[0] == 0x50) ||1190 (info->rom[1] == 0x7 && info->rom[0] == 0xFF))1191 ) {1192 /* Invalid reading (scratchpad byte 6 = 0xC)1193 * due to insufficient conversion time1194 * or power failure.1195 */1196 ret = -EIO;1197 }1198 1199 goto dec_refcnt;1200 }1201 1202 }1203 1204mt_unlock:1205 mutex_unlock(&dev_master->bus_mutex);1206dec_refcnt:1207 atomic_dec(THERM_REFCNT(sl->family_data));1208error:1209 return ret;1210}1211 1212static int conv_time_measure(struct w1_slave *sl, int *conv_time)1213{1214 struct therm_info inf,1215 *info = &inf;1216 struct w1_master *dev_master = sl->master;1217 int max_trying = W1_THERM_MAX_TRY;1218 int ret = -ENODEV;1219 bool strong_pullup;1220 1221 if (!sl->family_data)1222 goto error;1223 1224 strong_pullup = (w1_strong_pullup == 2 ||1225 (!SLAVE_POWERMODE(sl) &&1226 w1_strong_pullup));1227 1228 if (strong_pullup) {1229 pr_info("%s: Measure with strong_pullup is not supported.\n", __func__);1230 return -EINVAL;1231 }1232 1233 memset(info->rom, 0, sizeof(info->rom));1234 1235 /* prevent the slave from going away in sleep */1236 atomic_inc(THERM_REFCNT(sl->family_data));1237 1238 if (!bus_mutex_lock(&dev_master->bus_mutex)) {1239 ret = -EAGAIN; /* Didn't acquire the mutex */1240 goto dec_refcnt;1241 }1242 1243 while (max_trying-- && ret) { /* ret should be 0 */1244 info->verdict = 0;1245 info->crc = 0;1246 /* safe version to select slave */1247 if (!reset_select_slave(sl)) {1248 int j_start, j_end;1249 1250 /*no device need pullup */1251 w1_write_8(dev_master, W1_CONVERT_TEMP);1252 1253 j_start = jiffies;1254 ret = w1_poll_completion(dev_master, W1_POLL_CONVERT_TEMP);1255 if (ret) {1256 dev_dbg(&sl->dev, "%s: Timeout\n", __func__);1257 goto mt_unlock;1258 }1259 j_end = jiffies;1260 /* 1.2x increase for variation and changes over temperature range */1261 *conv_time = jiffies_to_msecs(j_end-j_start)*12/10;1262 pr_debug("W1 Measure complete, conv_time = %d, HZ=%d.\n",1263 *conv_time, HZ);1264 if (*conv_time <= CONV_TIME_MEASURE) {1265 ret = -EIO;1266 goto mt_unlock;1267 }1268 mutex_unlock(&dev_master->bus_mutex);1269 ret = read_scratchpad(sl, info);1270 goto dec_refcnt;1271 }1272 1273 }1274mt_unlock:1275 mutex_unlock(&dev_master->bus_mutex);1276dec_refcnt:1277 atomic_dec(THERM_REFCNT(sl->family_data));1278error:1279 return ret;1280}1281 1282static int read_scratchpad(struct w1_slave *sl, struct therm_info *info)1283{1284 struct w1_master *dev_master = sl->master;1285 int max_trying = W1_THERM_MAX_TRY;1286 int ret = -ENODEV;1287 1288 info->verdict = 0;1289 1290 if (!sl->family_data)1291 goto error;1292 1293 memset(info->rom, 0, sizeof(info->rom));1294 1295 /* prevent the slave from going away in sleep */1296 atomic_inc(THERM_REFCNT(sl->family_data));1297 1298 if (!bus_mutex_lock(&dev_master->bus_mutex)) {1299 ret = -EAGAIN; /* Didn't acquire the mutex */1300 goto dec_refcnt;1301 }1302 1303 while (max_trying-- && ret) { /* ret should be 0 */1304 /* safe version to select slave */1305 if (!reset_select_slave(sl)) {1306 u8 nb_bytes_read;1307 1308 w1_write_8(dev_master, W1_READ_SCRATCHPAD);1309 1310 nb_bytes_read = w1_read_block(dev_master, info->rom, 9);1311 if (nb_bytes_read != 9) {1312 dev_warn(&sl->dev,1313 "w1_read_block(): returned %u instead of 9.\n",1314 nb_bytes_read);1315 ret = -EIO;1316 }1317 1318 info->crc = w1_calc_crc8(info->rom, 8);1319 1320 if (info->rom[8] == info->crc) {1321 info->verdict = 1;1322 ret = 0;1323 } else1324 ret = -EIO; /* CRC not checked */1325 }1326 1327 }1328 mutex_unlock(&dev_master->bus_mutex);1329 1330dec_refcnt:1331 atomic_dec(THERM_REFCNT(sl->family_data));1332error:1333 return ret;1334}1335 1336static int write_scratchpad(struct w1_slave *sl, const u8 *data, u8 nb_bytes)1337{1338 struct w1_master *dev_master = sl->master;1339 int max_trying = W1_THERM_MAX_TRY;1340 int ret = -ENODEV;1341 1342 if (!sl->family_data)1343 goto error;1344 1345 /* prevent the slave from going away in sleep */1346 atomic_inc(THERM_REFCNT(sl->family_data));1347 1348 if (!bus_mutex_lock(&dev_master->bus_mutex)) {1349 ret = -EAGAIN; /* Didn't acquire the mutex */1350 goto dec_refcnt;1351 }1352 1353 while (max_trying-- && ret) { /* ret should be 0 */1354 /* safe version to select slave */1355 if (!reset_select_slave(sl)) {1356 w1_write_8(dev_master, W1_WRITE_SCRATCHPAD);1357 w1_write_block(dev_master, data, nb_bytes);1358 ret = 0;1359 }1360 }1361 mutex_unlock(&dev_master->bus_mutex);1362 1363dec_refcnt:1364 atomic_dec(THERM_REFCNT(sl->family_data));1365error:1366 return ret;1367}1368 1369static int copy_scratchpad(struct w1_slave *sl)1370{1371 struct w1_master *dev_master = sl->master;1372 int max_trying = W1_THERM_MAX_TRY;1373 int t_write, ret = -ENODEV;1374 bool strong_pullup;1375 1376 if (!sl->family_data)1377 goto error;1378 1379 t_write = W1_THERM_EEPROM_WRITE_DELAY;1380 strong_pullup = (w1_strong_pullup == 2 ||1381 (!SLAVE_POWERMODE(sl) &&1382 w1_strong_pullup));1383 1384 /* prevent the slave from going away in sleep */1385 atomic_inc(THERM_REFCNT(sl->family_data));1386 1387 if (!bus_mutex_lock(&dev_master->bus_mutex)) {1388 ret = -EAGAIN; /* Didn't acquire the mutex */1389 goto dec_refcnt;1390 }1391 1392 while (max_trying-- && ret) { /* ret should be 0 */1393 /* safe version to select slave */1394 if (!reset_select_slave(sl)) {1395 unsigned long sleep_rem;1396 1397 /* 10ms strong pullup (or delay) after the convert */1398 if (strong_pullup)1399 w1_next_pullup(dev_master, t_write);1400 1401 w1_write_8(dev_master, W1_COPY_SCRATCHPAD);1402 1403 if (strong_pullup) {1404 sleep_rem = msleep_interruptible(t_write);1405 if (sleep_rem != 0) {1406 ret = -EINTR;1407 goto mt_unlock;1408 }1409 }1410 ret = 0;1411 }1412 1413 }1414 1415mt_unlock:1416 mutex_unlock(&dev_master->bus_mutex);1417dec_refcnt:1418 atomic_dec(THERM_REFCNT(sl->family_data));1419error:1420 return ret;1421}1422 1423static int recall_eeprom(struct w1_slave *sl)1424{1425 struct w1_master *dev_master = sl->master;1426 int max_trying = W1_THERM_MAX_TRY;1427 int ret = -ENODEV;1428 1429 if (!sl->family_data)1430 goto error;1431 1432 /* prevent the slave from going away in sleep */1433 atomic_inc(THERM_REFCNT(sl->family_data));1434 1435 if (!bus_mutex_lock(&dev_master->bus_mutex)) {1436 ret = -EAGAIN; /* Didn't acquire the mutex */1437 goto dec_refcnt;1438 }1439 1440 while (max_trying-- && ret) { /* ret should be 0 */1441 /* safe version to select slave */1442 if (!reset_select_slave(sl)) {1443 1444 w1_write_8(dev_master, W1_RECALL_EEPROM);1445 ret = w1_poll_completion(dev_master, W1_POLL_RECALL_EEPROM);1446 }1447 1448 }1449 1450 mutex_unlock(&dev_master->bus_mutex);1451 1452dec_refcnt:1453 atomic_dec(THERM_REFCNT(sl->family_data));1454error:1455 return ret;1456}1457 1458static int read_powermode(struct w1_slave *sl)1459{1460 struct w1_master *dev_master = sl->master;1461 int max_trying = W1_THERM_MAX_TRY;1462 int ret = -ENODEV;1463 1464 if (!sl->family_data)1465 goto error;1466 1467 /* prevent the slave from going away in sleep */1468 atomic_inc(THERM_REFCNT(sl->family_data));1469 1470 if (!bus_mutex_lock(&dev_master->bus_mutex)) {1471 ret = -EAGAIN; /* Didn't acquire the mutex */1472 goto dec_refcnt;1473 }1474 1475 while ((max_trying--) && (ret < 0)) {1476 /* safe version to select slave */1477 if (!reset_select_slave(sl)) {1478 w1_write_8(dev_master, W1_READ_PSUPPLY);1479 /*1480 * Emit a read time slot and read only one bit,1481 * 1 is externally powered,1482 * 0 is parasite powered1483 */1484 ret = w1_touch_bit(dev_master, 1);1485 /* ret should be either 1 either 0 */1486 }1487 }1488 mutex_unlock(&dev_master->bus_mutex);1489 1490dec_refcnt:1491 atomic_dec(THERM_REFCNT(sl->family_data));1492error:1493 return ret;1494}1495 1496static int trigger_bulk_read(struct w1_master *dev_master)1497{1498 struct w1_slave *sl = NULL; /* used to iterate through slaves */1499 int max_trying = W1_THERM_MAX_TRY;1500 int t_conv = 0;1501 int ret = -ENODEV;1502 bool strong_pullup = false;1503 1504 /*1505 * Check whether there are parasite powered device on the bus,1506 * and compute duration of conversion for these devices1507 * so we can apply a strong pullup if required1508 */1509 list_for_each_entry(sl, &dev_master->slist, w1_slave_entry) {1510 if (!sl->family_data)1511 goto error;1512 if (bulk_read_support(sl)) {1513 int t_cur = conversion_time(sl);1514 1515 t_conv = max(t_cur, t_conv);1516 strong_pullup = strong_pullup ||1517 (w1_strong_pullup == 2 ||1518 (!SLAVE_POWERMODE(sl) &&1519 w1_strong_pullup));1520 }1521 }1522 1523 /*1524 * t_conv is the max conversion time required on the bus1525 * If its 0, no device support the bulk read feature1526 */1527 if (!t_conv)1528 goto error;1529 1530 if (!bus_mutex_lock(&dev_master->bus_mutex)) {1531 ret = -EAGAIN; /* Didn't acquire the mutex */1532 goto error;1533 }1534 1535 while ((max_trying--) && (ret < 0)) { /* ret should be either 0 */1536 1537 if (!w1_reset_bus(dev_master)) { /* Just reset the bus */1538 unsigned long sleep_rem;1539 1540 w1_write_8(dev_master, W1_SKIP_ROM);1541 1542 if (strong_pullup) /* Apply pullup if required */1543 w1_next_pullup(dev_master, t_conv);1544 1545 w1_write_8(dev_master, W1_CONVERT_TEMP);1546 1547 /* set a flag to instruct that converT pending */1548 list_for_each_entry(sl,1549 &dev_master->slist, w1_slave_entry) {1550 if (bulk_read_support(sl))1551 SLAVE_CONVERT_TRIGGERED(sl) = -1;1552 }1553 1554 if (strong_pullup) { /* some device need pullup */1555 sleep_rem = msleep_interruptible(t_conv);1556 if (sleep_rem != 0) {1557 ret = -EINTR;1558 goto mt_unlock;1559 }1560 mutex_unlock(&dev_master->bus_mutex);1561 } else {1562 mutex_unlock(&dev_master->bus_mutex);1563 sleep_rem = msleep_interruptible(t_conv);1564 if (sleep_rem != 0) {1565 ret = -EINTR;1566 goto set_flag;1567 }1568 }1569 ret = 0;1570 goto set_flag;1571 }1572 }1573 1574mt_unlock:1575 mutex_unlock(&dev_master->bus_mutex);1576set_flag:1577 /* set a flag to register convsersion is done */1578 list_for_each_entry(sl, &dev_master->slist, w1_slave_entry) {1579 if (bulk_read_support(sl))1580 SLAVE_CONVERT_TRIGGERED(sl) = 1;1581 }1582error:1583 return ret;1584}1585 1586/* Sysfs Interface definition */1587 1588static ssize_t w1_slave_show(struct device *device,1589 struct device_attribute *attr, char *buf)1590{1591 struct w1_slave *sl = dev_to_w1_slave(device);1592 struct therm_info info;1593 u8 *family_data = sl->family_data;1594 int ret, i;1595 ssize_t c = PAGE_SIZE;1596 1597 if (bulk_read_support(sl)) {1598 if (SLAVE_CONVERT_TRIGGERED(sl) < 0) {1599 dev_dbg(device,1600 "%s: Conversion in progress, retry later\n",1601 __func__);1602 return 0;1603 } else if (SLAVE_CONVERT_TRIGGERED(sl) > 0) {1604 /* A bulk read has been issued, read the device RAM */1605 ret = read_scratchpad(sl, &info);1606 SLAVE_CONVERT_TRIGGERED(sl) = 0;1607 } else1608 ret = convert_t(sl, &info);1609 } else1610 ret = convert_t(sl, &info);1611 1612 if (ret < 0) {1613 dev_dbg(device,1614 "%s: Temperature data may be corrupted. err=%d\n",1615 __func__, ret);1616 return 0;1617 }1618 1619 for (i = 0; i < 9; ++i)1620 c -= snprintf(buf + PAGE_SIZE - c, c, "%02x ", info.rom[i]);1621 c -= snprintf(buf + PAGE_SIZE - c, c, ": crc=%02x %s\n",1622 info.crc, (info.verdict) ? "YES" : "NO");1623 1624 if (info.verdict)1625 memcpy(family_data, info.rom, sizeof(info.rom));1626 else1627 dev_warn(device, "%s:Read failed CRC check\n", __func__);1628 1629 for (i = 0; i < 9; ++i)1630 c -= snprintf(buf + PAGE_SIZE - c, c, "%02x ",1631 ((u8 *)family_data)[i]);1632 1633 c -= snprintf(buf + PAGE_SIZE - c, c, "t=%d\n",1634 temperature_from_RAM(sl, info.rom));1635 1636 ret = PAGE_SIZE - c;1637 return ret;1638}1639 1640static ssize_t w1_slave_store(struct device *device,1641 struct device_attribute *attr, const char *buf,1642 size_t size)1643{1644 int val, ret = 0;1645 struct w1_slave *sl = dev_to_w1_slave(device);1646 1647 ret = kstrtoint(buf, 10, &val); /* converting user entry to int */1648 1649 if (ret) { /* conversion error */1650 dev_info(device,1651 "%s: conversion error. err= %d\n", __func__, ret);1652 return size; /* return size to avoid call back again */1653 }1654 1655 if ((!sl->family_data) || (!SLAVE_SPECIFIC_FUNC(sl))) {1656 dev_info(device,1657 "%s: Device not supported by the driver\n", __func__);1658 return size; /* No device family */1659 }1660 1661 if (val == 0) /* val=0 : trigger a EEPROM save */1662 ret = copy_scratchpad(sl);1663 else {1664 if (SLAVE_SPECIFIC_FUNC(sl)->set_resolution)1665 ret = SLAVE_SPECIFIC_FUNC(sl)->set_resolution(sl, val);1666 }1667 1668 if (ret) {1669 dev_warn(device, "%s: Set resolution - error %d\n", __func__, ret);1670 /* Propagate error to userspace */1671 return ret;1672 }1673 SLAVE_RESOLUTION(sl) = val;1674 /* Reset the conversion time to default - it depends on resolution */1675 SLAVE_CONV_TIME_OVERRIDE(sl) = CONV_TIME_DEFAULT;1676 1677 return size; /* always return size to avoid infinite calling */1678}1679 1680static ssize_t temperature_show(struct device *device,1681 struct device_attribute *attr, char *buf)1682{1683 struct w1_slave *sl = dev_to_w1_slave(device);1684 struct therm_info info;1685 int ret = 0;1686 1687 if ((!sl->family_data) || (!SLAVE_SPECIFIC_FUNC(sl))) {1688 dev_info(device,1689 "%s: Device not supported by the driver\n", __func__);1690 return 0; /* No device family */1691 }1692 1693 if (bulk_read_support(sl)) {1694 if (SLAVE_CONVERT_TRIGGERED(sl) < 0) {1695 dev_dbg(device,1696 "%s: Conversion in progress, retry later\n",1697 __func__);1698 return 0;1699 } else if (SLAVE_CONVERT_TRIGGERED(sl) > 0) {1700 /* A bulk read has been issued, read the device RAM */1701 ret = read_scratchpad(sl, &info);1702 SLAVE_CONVERT_TRIGGERED(sl) = 0;1703 } else1704 ret = convert_t(sl, &info);1705 } else1706 ret = convert_t(sl, &info);1707 1708 if (ret < 0) {1709 dev_dbg(device,1710 "%s: Temperature data may be corrupted. err=%d\n",1711 __func__, ret);1712 return 0;1713 }1714 1715 return sprintf(buf, "%d\n", temperature_from_RAM(sl, info.rom));1716}1717 1718static ssize_t ext_power_show(struct device *device,1719 struct device_attribute *attr, char *buf)1720{1721 struct w1_slave *sl = dev_to_w1_slave(device);1722 1723 if (!sl->family_data) {1724 dev_info(device,1725 "%s: Device not supported by the driver\n", __func__);1726 return 0; /* No device family */1727 }1728 1729 /* Getting the power mode of the device {external, parasite} */1730 SLAVE_POWERMODE(sl) = read_powermode(sl);1731 1732 if (SLAVE_POWERMODE(sl) < 0) {1733 dev_dbg(device,1734 "%s: Power_mode may be corrupted. err=%d\n",1735 __func__, SLAVE_POWERMODE(sl));1736 }1737 return sprintf(buf, "%d\n", SLAVE_POWERMODE(sl));1738}1739 1740static ssize_t resolution_show(struct device *device,1741 struct device_attribute *attr, char *buf)1742{1743 struct w1_slave *sl = dev_to_w1_slave(device);1744 1745 if ((!sl->family_data) || (!SLAVE_SPECIFIC_FUNC(sl))) {1746 dev_info(device,1747 "%s: Device not supported by the driver\n", __func__);1748 return 0; /* No device family */1749 }1750 1751 /* get the correct function depending on the device */1752 SLAVE_RESOLUTION(sl) = SLAVE_SPECIFIC_FUNC(sl)->get_resolution(sl);1753 if (SLAVE_RESOLUTION(sl) < 0) {1754 dev_dbg(device,1755 "%s: Resolution may be corrupted. err=%d\n",1756 __func__, SLAVE_RESOLUTION(sl));1757 }1758 1759 return sprintf(buf, "%d\n", SLAVE_RESOLUTION(sl));1760}1761 1762static ssize_t resolution_store(struct device *device,1763 struct device_attribute *attr, const char *buf, size_t size)1764{1765 struct w1_slave *sl = dev_to_w1_slave(device);1766 int val;1767 int ret = 0;1768 1769 ret = kstrtoint(buf, 10, &val); /* converting user entry to int */1770 1771 if (ret) { /* conversion error */1772 dev_info(device,1773 "%s: conversion error. err= %d\n", __func__, ret);1774 return size; /* return size to avoid call back again */1775 }1776 1777 if ((!sl->family_data) || (!SLAVE_SPECIFIC_FUNC(sl))) {1778 dev_info(device,1779 "%s: Device not supported by the driver\n", __func__);1780 return size; /* No device family */1781 }1782 1783 /*1784 * Don't deal with the val enterd by user,1785 * only device knows what is correct or not1786 */1787 1788 /* get the correct function depending on the device */1789 ret = SLAVE_SPECIFIC_FUNC(sl)->set_resolution(sl, val);1790 1791 if (ret)1792 return ret;1793 1794 SLAVE_RESOLUTION(sl) = val;1795 /* Reset the conversion time to default because it depends on resolution */1796 SLAVE_CONV_TIME_OVERRIDE(sl) = CONV_TIME_DEFAULT;1797 1798 return size;1799}1800 1801static ssize_t eeprom_cmd_store(struct device *device,1802 struct device_attribute *attr, const char *buf, size_t size)1803{1804 struct w1_slave *sl = dev_to_w1_slave(device);1805 int ret = -EINVAL; /* Invalid argument */1806 1807 if (size == sizeof(EEPROM_CMD_WRITE)) {1808 if (!strncmp(buf, EEPROM_CMD_WRITE, sizeof(EEPROM_CMD_WRITE)-1))1809 ret = copy_scratchpad(sl);1810 } else if (size == sizeof(EEPROM_CMD_READ)) {1811 if (!strncmp(buf, EEPROM_CMD_READ, sizeof(EEPROM_CMD_READ)-1))1812 ret = recall_eeprom(sl);1813 }1814 1815 if (ret)1816 dev_info(device, "%s: error in process %d\n", __func__, ret);1817 1818 return size;1819}1820 1821static ssize_t alarms_show(struct device *device,1822 struct device_attribute *attr, char *buf)1823{1824 struct w1_slave *sl = dev_to_w1_slave(device);1825 int ret;1826 s8 th = 0, tl = 0;1827 struct therm_info scratchpad;1828 1829 ret = read_scratchpad(sl, &scratchpad);1830 1831 if (!ret) {1832 th = scratchpad.rom[2]; /* TH is byte 2 */1833 tl = scratchpad.rom[3]; /* TL is byte 3 */1834 } else {1835 dev_info(device,1836 "%s: error reading alarms register %d\n",1837 __func__, ret);1838 }1839 1840 return sprintf(buf, "%hd %hd\n", tl, th);1841}1842 1843static ssize_t alarms_store(struct device *device,1844 struct device_attribute *attr, const char *buf, size_t size)1845{1846 struct w1_slave *sl = dev_to_w1_slave(device);1847 struct therm_info info;1848 u8 new_config_register[3]; /* array of data to be written */1849 int temp, ret;1850 char *token = NULL;1851 s8 tl, th; /* 1 byte per value + temp ring order */1852 char *p_args, *orig;1853 1854 p_args = orig = kmalloc(size, GFP_KERNEL);1855 /* Safe string copys as buf is const */1856 if (!p_args) {1857 dev_warn(device,1858 "%s: error unable to allocate memory %d\n",1859 __func__, -ENOMEM);1860 return size;1861 }1862 strcpy(p_args, buf);1863 1864 /* Split string using space char */1865 token = strsep(&p_args, " ");1866 1867 if (!token) {1868 dev_info(device,1869 "%s: error parsing args %d\n", __func__, -EINVAL);1870 goto free_m;1871 }1872 1873 /* Convert 1st entry to int */1874 ret = kstrtoint (token, 10, &temp);1875 if (ret) {1876 dev_info(device,1877 "%s: error parsing args %d\n", __func__, ret);1878 goto free_m;1879 }1880 1881 tl = int_to_short(temp);1882 1883 /* Split string using space char */1884 token = strsep(&p_args, " ");1885 if (!token) {1886 dev_info(device,1887 "%s: error parsing args %d\n", __func__, -EINVAL);1888 goto free_m;1889 }1890 /* Convert 2nd entry to int */1891 ret = kstrtoint (token, 10, &temp);1892 if (ret) {1893 dev_info(device,1894 "%s: error parsing args %d\n", __func__, ret);1895 goto free_m;1896 }1897 1898 /* Prepare to cast to short by eliminating out of range values */1899 th = int_to_short(temp);1900 1901 /* Reorder if required th and tl */1902 if (tl > th)1903 swap(tl, th);1904 1905 /*1906 * Read the scratchpad to change only the required bits1907 * (th : byte 2 - tl: byte 3)1908 */1909 ret = read_scratchpad(sl, &info);1910 if (!ret) {1911 new_config_register[0] = th; /* Byte 2 */1912 new_config_register[1] = tl; /* Byte 3 */1913 new_config_register[2] = info.rom[4];/* Byte 4 */1914 } else {1915 dev_info(device,1916 "%s: error reading from the slave device %d\n",1917 __func__, ret);1918 goto free_m;1919 }1920 1921 /* Write data in the device RAM */1922 if (!SLAVE_SPECIFIC_FUNC(sl)) {1923 dev_info(device,1924 "%s: Device not supported by the driver %d\n",1925 __func__, -ENODEV);1926 goto free_m;1927 }1928 1929 ret = SLAVE_SPECIFIC_FUNC(sl)->write_data(sl, new_config_register);1930 if (ret)1931 dev_info(device,1932 "%s: error writing to the slave device %d\n",1933 __func__, ret);1934 1935free_m:1936 /* free allocated memory */1937 kfree(orig);1938 1939 return size;1940}1941 1942static ssize_t therm_bulk_read_store(struct device *device,1943 struct device_attribute *attr, const char *buf, size_t size)1944{1945 struct w1_master *dev_master = dev_to_w1_master(device);1946 int ret = -EINVAL; /* Invalid argument */1947 1948 if (size == sizeof(BULK_TRIGGER_CMD))1949 if (!strncmp(buf, BULK_TRIGGER_CMD,1950 sizeof(BULK_TRIGGER_CMD)-1))1951 ret = trigger_bulk_read(dev_master);1952 1953 if (ret)1954 dev_info(device,1955 "%s: unable to trigger a bulk read on the bus. err=%d\n",1956 __func__, ret);1957 1958 return size;1959}1960 1961static ssize_t therm_bulk_read_show(struct device *device,1962 struct device_attribute *attr, char *buf)1963{1964 struct w1_master *dev_master = dev_to_w1_master(device);1965 struct w1_slave *sl = NULL;1966 int ret = 0;1967 1968 list_for_each_entry(sl, &dev_master->slist, w1_slave_entry) {1969 if (sl->family_data) {1970 if (bulk_read_support(sl)) {1971 if (SLAVE_CONVERT_TRIGGERED(sl) == -1) {1972 ret = -1;1973 goto show_result;1974 }1975 if (SLAVE_CONVERT_TRIGGERED(sl) == 1)1976 /* continue to check other slaves */1977 ret = 1;1978 }1979 }1980 }1981show_result:1982 return sprintf(buf, "%d\n", ret);1983}1984 1985static ssize_t conv_time_show(struct device *device,1986 struct device_attribute *attr, char *buf)1987{1988 struct w1_slave *sl = dev_to_w1_slave(device);1989 1990 if ((!sl->family_data) || (!SLAVE_SPECIFIC_FUNC(sl))) {1991 dev_info(device,1992 "%s: Device is not supported by the driver\n", __func__);1993 return 0; /* No device family */1994 }1995 return sprintf(buf, "%d\n", conversion_time(sl));1996}1997 1998static ssize_t conv_time_store(struct device *device,1999 struct device_attribute *attr, const char *buf, size_t size)2000{2001 int val, ret = 0;2002 struct w1_slave *sl = dev_to_w1_slave(device);2003 2004 if (kstrtoint(buf, 10, &val)) /* converting user entry to int */2005 return -EINVAL;2006 2007 if (check_family_data(sl))2008 return -ENODEV;2009 2010 if (val != CONV_TIME_MEASURE) {2011 if (val >= CONV_TIME_DEFAULT)2012 SLAVE_CONV_TIME_OVERRIDE(sl) = val;2013 else2014 return -EINVAL;2015 2016 } else {2017 int conv_time;2018 2019 ret = conv_time_measure(sl, &conv_time);2020 if (ret)2021 return -EIO;2022 SLAVE_CONV_TIME_OVERRIDE(sl) = conv_time;2023 }2024 return size;2025}2026 2027static ssize_t features_show(struct device *device,2028 struct device_attribute *attr, char *buf)2029{2030 struct w1_slave *sl = dev_to_w1_slave(device);2031 2032 if ((!sl->family_data) || (!SLAVE_SPECIFIC_FUNC(sl))) {2033 dev_info(device,2034 "%s: Device not supported by the driver\n", __func__);2035 return 0; /* No device family */2036 }2037 return sprintf(buf, "%u\n", SLAVE_FEATURES(sl));2038}2039 2040static ssize_t features_store(struct device *device,2041 struct device_attribute *attr, const char *buf, size_t size)2042{2043 int val, ret = 0;2044 bool strong_pullup;2045 struct w1_slave *sl = dev_to_w1_slave(device);2046 2047 ret = kstrtouint(buf, 10, &val); /* converting user entry to int */2048 if (ret)2049 return -EINVAL; /* invalid number */2050 2051 if ((!sl->family_data) || (!SLAVE_SPECIFIC_FUNC(sl))) {2052 dev_info(device, "%s: Device not supported by the driver\n", __func__);2053 return -ENODEV;2054 }2055 2056 if ((val & W1_THERM_FEATURES_MASK) != val)2057 return -EINVAL;2058 2059 SLAVE_FEATURES(sl) = val;2060 2061 strong_pullup = (w1_strong_pullup == 2 ||2062 (!SLAVE_POWERMODE(sl) &&2063 w1_strong_pullup));2064 2065 if (strong_pullup && SLAVE_FEATURES(sl) & W1_THERM_POLL_COMPLETION) {2066 dev_warn(&sl->dev,2067 "%s: W1_THERM_POLL_COMPLETION disabled in parasite power mode.\n",2068 __func__);2069 SLAVE_FEATURES(sl) &= ~W1_THERM_POLL_COMPLETION;2070 }2071 2072 return size;2073}2074 2075#if IS_REACHABLE(CONFIG_HWMON)2076static int w1_read_temp(struct device *device, u32 attr, int channel,2077 long *val)2078{2079 struct w1_slave *sl = dev_get_drvdata(device);2080 struct therm_info info;2081 int ret;2082 2083 switch (attr) {2084 case hwmon_temp_input:2085 ret = convert_t(sl, &info);2086 if (ret)2087 return ret;2088 2089 if (!info.verdict) {2090 ret = -EIO;2091 return ret;2092 }2093 2094 *val = temperature_from_RAM(sl, info.rom);2095 ret = 0;2096 break;2097 default:2098 ret = -EOPNOTSUPP;2099 break;2100 }2101 2102 return ret;2103}2104#endif2105 2106#define W1_42_CHAIN 0x992107#define W1_42_CHAIN_OFF 0x3C2108#define W1_42_CHAIN_OFF_INV 0xC32109#define W1_42_CHAIN_ON 0x5A2110#define W1_42_CHAIN_ON_INV 0xA52111#define W1_42_CHAIN_DONE 0x962112#define W1_42_CHAIN_DONE_INV 0x692113#define W1_42_COND_READ 0x0F2114#define W1_42_SUCCESS_CONFIRM_BYTE 0xAA2115#define W1_42_FINISHED_BYTE 0xFF2116static ssize_t w1_seq_show(struct device *device,2117 struct device_attribute *attr, char *buf)2118{2119 struct w1_slave *sl = dev_to_w1_slave(device);2120 ssize_t c = PAGE_SIZE;2121 int i;2122 u8 ack;2123 u64 rn;2124 struct w1_reg_num *reg_num;2125 int seq = 0;2126 2127 mutex_lock(&sl->master->bus_mutex);2128 /* Place all devices in CHAIN state */2129 if (w1_reset_bus(sl->master))2130 goto error;2131 w1_write_8(sl->master, W1_SKIP_ROM);2132 w1_write_8(sl->master, W1_42_CHAIN);2133 w1_write_8(sl->master, W1_42_CHAIN_ON);2134 w1_write_8(sl->master, W1_42_CHAIN_ON_INV);2135 msleep(sl->master->pullup_duration);2136 2137 /* check for acknowledgment */2138 ack = w1_read_8(sl->master);2139 if (ack != W1_42_SUCCESS_CONFIRM_BYTE)2140 goto error;2141 2142 /* In case the bus fails to send 0xFF, limit */2143 for (i = 0; i <= 64; i++) {2144 if (w1_reset_bus(sl->master))2145 goto error;2146 2147 w1_write_8(sl->master, W1_42_COND_READ);2148 w1_read_block(sl->master, (u8 *)&rn, 8);2149 reg_num = (struct w1_reg_num *) &rn;2150 if (reg_num->family == W1_42_FINISHED_BYTE)2151 break;2152 if (sl->reg_num.id == reg_num->id)2153 seq = i;2154 2155 if (w1_reset_bus(sl->master))2156 goto error;2157 2158 /* Put the device into chain DONE state */2159 w1_write_8(sl->master, W1_MATCH_ROM);2160 w1_write_block(sl->master, (u8 *)&rn, 8);2161 w1_write_8(sl->master, W1_42_CHAIN);2162 w1_write_8(sl->master, W1_42_CHAIN_DONE);2163 w1_write_8(sl->master, W1_42_CHAIN_DONE_INV);2164 2165 /* check for acknowledgment */2166 ack = w1_read_8(sl->master);2167 if (ack != W1_42_SUCCESS_CONFIRM_BYTE)2168 goto error;2169 }2170 2171 /* Exit from CHAIN state */2172 if (w1_reset_bus(sl->master))2173 goto error;2174 w1_write_8(sl->master, W1_SKIP_ROM);2175 w1_write_8(sl->master, W1_42_CHAIN);2176 w1_write_8(sl->master, W1_42_CHAIN_OFF);2177 w1_write_8(sl->master, W1_42_CHAIN_OFF_INV);2178 2179 /* check for acknowledgment */2180 ack = w1_read_8(sl->master);2181 if (ack != W1_42_SUCCESS_CONFIRM_BYTE)2182 goto error;2183 mutex_unlock(&sl->master->bus_mutex);2184 2185 c -= snprintf(buf + PAGE_SIZE - c, c, "%d\n", seq);2186 return PAGE_SIZE - c;2187error:2188 mutex_unlock(&sl->master->bus_mutex);2189 return -EIO;2190}2191 2192static int __init w1_therm_init(void)2193{2194 int err, i;2195 2196 for (i = 0; i < ARRAY_SIZE(w1_therm_families); ++i) {2197 err = w1_register_family(w1_therm_families[i].f);2198 if (err)2199 w1_therm_families[i].broken = 1;2200 }2201 2202 return 0;2203}2204 2205static void __exit w1_therm_fini(void)2206{2207 int i;2208 2209 for (i = 0; i < ARRAY_SIZE(w1_therm_families); ++i)2210 if (!w1_therm_families[i].broken)2211 w1_unregister_family(w1_therm_families[i].f);2212}2213 2214module_init(w1_therm_init);2215module_exit(w1_therm_fini);2216 2217MODULE_AUTHOR("Evgeniy Polyakov <zbr@ioremap.net>");2218MODULE_DESCRIPTION("Driver for 1-wire Dallas network protocol, temperature family.");2219MODULE_LICENSE("GPL");2220MODULE_ALIAS("w1-family-" __stringify(W1_THERM_DS18S20));2221MODULE_ALIAS("w1-family-" __stringify(W1_THERM_DS1822));2222MODULE_ALIAS("w1-family-" __stringify(W1_THERM_DS18B20));2223MODULE_ALIAS("w1-family-" __stringify(W1_THERM_DS1825));2224MODULE_ALIAS("w1-family-" __stringify(W1_THERM_DS28EA00));2225