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2160 lines
56 KiB
2160 lines
56 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* w1_therm.c |
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* |
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* Copyright (c) 2004 Evgeniy Polyakov <[email protected]> |
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*/ |
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#include <asm/types.h> |
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/moduleparam.h> |
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#include <linux/sched.h> |
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#include <linux/device.h> |
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#include <linux/types.h> |
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#include <linux/slab.h> |
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#include <linux/delay.h> |
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#include <linux/hwmon.h> |
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#include <linux/string.h> |
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#include <linux/jiffies.h> |
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#include <linux/w1.h> |
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#define W1_THERM_DS18S20 0x10 |
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#define W1_THERM_DS1822 0x22 |
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#define W1_THERM_DS18B20 0x28 |
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#define W1_THERM_DS1825 0x3B |
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#define W1_THERM_DS28EA00 0x42 |
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/* |
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* Allow the strong pullup to be disabled, but default to enabled. |
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* If it was disabled a parasite powered device might not get the require |
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* current to do a temperature conversion. If it is enabled parasite powered |
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* devices have a better chance of getting the current required. |
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* In case the parasite power-detection is not working (seems to be the case |
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* for some DS18S20) the strong pullup can also be forced, regardless of the |
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* power state of the devices. |
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* |
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* Summary of options: |
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* - strong_pullup = 0 Disable strong pullup completely |
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* - strong_pullup = 1 Enable automatic strong pullup detection |
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* - strong_pullup = 2 Force strong pullup |
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*/ |
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static int w1_strong_pullup = 1; |
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module_param_named(strong_pullup, w1_strong_pullup, int, 0); |
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/* Counter for devices supporting bulk reading */ |
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static u16 bulk_read_device_counter; /* =0 as per C standard */ |
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/* This command should be in public header w1.h but is not */ |
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#define W1_RECALL_EEPROM 0xB8 |
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/* Nb of try for an operation */ |
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#define W1_THERM_MAX_TRY 5 |
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/* ms delay to retry bus mutex */ |
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#define W1_THERM_RETRY_DELAY 20 |
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/* delay in ms to write in EEPROM */ |
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#define W1_THERM_EEPROM_WRITE_DELAY 10 |
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#define EEPROM_CMD_WRITE "save" /* cmd for write eeprom sysfs */ |
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#define EEPROM_CMD_READ "restore" /* cmd for read eeprom sysfs */ |
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#define BULK_TRIGGER_CMD "trigger" /* cmd to trigger a bulk read */ |
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#define MIN_TEMP -55 /* min temperature that can be mesured */ |
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#define MAX_TEMP 125 /* max temperature that can be mesured */ |
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/* Allowed values for sysfs conv_time attribute */ |
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#define CONV_TIME_DEFAULT 0 |
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#define CONV_TIME_MEASURE 1 |
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/* Bits in sysfs "features" value */ |
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#define W1_THERM_CHECK_RESULT 1 /* Enable conversion success check */ |
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#define W1_THERM_POLL_COMPLETION 2 /* Poll for conversion completion */ |
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#define W1_THERM_FEATURES_MASK 3 /* All values mask */ |
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/* Poll period in milliseconds. Should be less then a shortest operation on the device */ |
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#define W1_POLL_PERIOD 32 |
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#define W1_POLL_CONVERT_TEMP 2000 /* Timeout for W1_CONVERT_TEMP, ms */ |
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#define W1_POLL_RECALL_EEPROM 500 /* Timeout for W1_RECALL_EEPROM, ms*/ |
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/* Masks for resolution functions, work with all devices */ |
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/* Bit mask for config register for all devices, bits 7,6,5 */ |
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#define W1_THERM_RESOLUTION_MASK 0xE0 |
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/* Bit offset of resolution in config register for all devices */ |
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#define W1_THERM_RESOLUTION_SHIFT 5 |
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/* Bit offset of resolution in config register for all devices */ |
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#define W1_THERM_RESOLUTION_SHIFT 5 |
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/* Add this to bit value to get resolution */ |
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#define W1_THERM_RESOLUTION_MIN 9 |
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/* Maximum allowed value */ |
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#define W1_THERM_RESOLUTION_MAX 14 |
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/* Helpers Macros */ |
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/* |
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* return a pointer on the slave w1_therm_family_converter struct: |
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* always test family data existence before using this macro |
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*/ |
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#define SLAVE_SPECIFIC_FUNC(sl) \ |
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(((struct w1_therm_family_data *)(sl->family_data))->specific_functions) |
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/* |
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* return the power mode of the sl slave : 1-ext, 0-parasite, <0 unknown |
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* always test family data existence before using this macro |
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*/ |
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#define SLAVE_POWERMODE(sl) \ |
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(((struct w1_therm_family_data *)(sl->family_data))->external_powered) |
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/* |
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* return the resolution in bit of the sl slave : <0 unknown |
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* always test family data existence before using this macro |
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*/ |
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#define SLAVE_RESOLUTION(sl) \ |
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(((struct w1_therm_family_data *)(sl->family_data))->resolution) |
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/* |
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* return the conv_time_override of the sl slave |
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* always test family data existence before using this macro |
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*/ |
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#define SLAVE_CONV_TIME_OVERRIDE(sl) \ |
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(((struct w1_therm_family_data *)(sl->family_data))->conv_time_override) |
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/* |
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* return the features of the sl slave |
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* always test family data existence before using this macro |
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*/ |
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#define SLAVE_FEATURES(sl) \ |
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(((struct w1_therm_family_data *)(sl->family_data))->features) |
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/* |
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* return whether or not a converT command has been issued to the slave |
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* * 0: no bulk read is pending |
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* * -1: conversion is in progress |
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* * 1: conversion done, result to be read |
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*/ |
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#define SLAVE_CONVERT_TRIGGERED(sl) \ |
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(((struct w1_therm_family_data *)(sl->family_data))->convert_triggered) |
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/* return the address of the refcnt in the family data */ |
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#define THERM_REFCNT(family_data) \ |
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(&((struct w1_therm_family_data *)family_data)->refcnt) |
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/* Structs definition */ |
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/** |
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* struct w1_therm_family_converter - bind device specific functions |
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* @broken: flag for non-registred families |
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* @reserved: not used here |
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* @f: pointer to the device binding structure |
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* @convert: pointer to the device conversion function |
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* @get_conversion_time: pointer to the device conversion time function |
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* @set_resolution: pointer to the device set_resolution function |
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* @get_resolution: pointer to the device get_resolution function |
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* @write_data: pointer to the device writing function (2 or 3 bytes) |
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* @bulk_read: true if device family support bulk read, false otherwise |
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*/ |
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struct w1_therm_family_converter { |
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u8 broken; |
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u16 reserved; |
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struct w1_family *f; |
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int (*convert)(u8 rom[9]); |
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int (*get_conversion_time)(struct w1_slave *sl); |
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int (*set_resolution)(struct w1_slave *sl, int val); |
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int (*get_resolution)(struct w1_slave *sl); |
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int (*write_data)(struct w1_slave *sl, const u8 *data); |
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bool bulk_read; |
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}; |
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/** |
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* struct w1_therm_family_data - device data |
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* @rom: ROM device id (64bit Lasered ROM code + 1 CRC byte) |
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* @refcnt: ref count |
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* @external_powered: 1 device powered externally, |
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* 0 device parasite powered, |
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* -x error or undefined |
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* @resolution: current device resolution |
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* @convert_triggered: conversion state of the device |
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* @conv_time_override: user selected conversion time or CONV_TIME_DEFAULT |
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* @features: bit mask - enable temperature validity check, poll for completion |
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* @specific_functions: pointer to struct of device specific function |
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*/ |
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struct w1_therm_family_data { |
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uint8_t rom[9]; |
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atomic_t refcnt; |
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int external_powered; |
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int resolution; |
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int convert_triggered; |
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int conv_time_override; |
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unsigned int features; |
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struct w1_therm_family_converter *specific_functions; |
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}; |
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/** |
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* struct therm_info - store temperature reading |
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* @rom: read device data (8 data bytes + 1 CRC byte) |
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* @crc: computed crc from rom |
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* @verdict: 1 crc checked, 0 crc not matching |
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*/ |
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struct therm_info { |
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u8 rom[9]; |
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u8 crc; |
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u8 verdict; |
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}; |
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/* Hardware Functions declaration */ |
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/** |
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* reset_select_slave() - reset and select a slave |
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* @sl: the slave to select |
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* |
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* Resets the bus and select the slave by sending a ROM MATCH cmd |
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* w1_reset_select_slave() from w1_io.c could not be used here because |
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* it sent a SKIP ROM command if only one device is on the line. |
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* At the beginning of the such process, sl->master->slave_count is 1 even if |
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* more devices are on the line, causing collision on the line. |
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* |
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* Context: The w1 master lock must be held. |
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* |
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* Return: 0 if success, negative kernel error code otherwise. |
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*/ |
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static int reset_select_slave(struct w1_slave *sl); |
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/** |
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* convert_t() - Query the device for temperature conversion and read |
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* @sl: pointer to the slave to read |
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* @info: pointer to a structure to store the read results |
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* |
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* Return: 0 if success, -kernel error code otherwise |
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*/ |
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static int convert_t(struct w1_slave *sl, struct therm_info *info); |
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/** |
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* read_scratchpad() - read the data in device RAM |
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* @sl: pointer to the slave to read |
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* @info: pointer to a structure to store the read results |
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* |
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* Return: 0 if success, -kernel error code otherwise |
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*/ |
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static int read_scratchpad(struct w1_slave *sl, struct therm_info *info); |
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/** |
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* write_scratchpad() - write nb_bytes in the device RAM |
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* @sl: pointer to the slave to write in |
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* @data: pointer to an array of 3 bytes, as 3 bytes MUST be written |
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* @nb_bytes: number of bytes to be written (2 for DS18S20, 3 otherwise) |
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* |
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* Return: 0 if success, -kernel error code otherwise |
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*/ |
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static int write_scratchpad(struct w1_slave *sl, const u8 *data, u8 nb_bytes); |
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/** |
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* copy_scratchpad() - Copy the content of scratchpad in device EEPROM |
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* @sl: slave involved |
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* |
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* Return: 0 if success, -kernel error code otherwise |
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*/ |
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static int copy_scratchpad(struct w1_slave *sl); |
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/** |
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* recall_eeprom() - Restore EEPROM data to device RAM |
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* @sl: slave involved |
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* |
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* Return: 0 if success, -kernel error code otherwise |
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*/ |
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static int recall_eeprom(struct w1_slave *sl); |
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/** |
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* read_powermode() - Query the power mode of the slave |
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* @sl: slave to retrieve the power mode |
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* |
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* Ask the device to get its power mode (external or parasite) |
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* and store the power status in the &struct w1_therm_family_data. |
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* |
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* Return: |
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* * 0 parasite powered device |
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* * 1 externally powered device |
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* * <0 kernel error code |
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*/ |
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static int read_powermode(struct w1_slave *sl); |
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/** |
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* trigger_bulk_read() - function to trigger a bulk read on the bus |
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* @dev_master: the device master of the bus |
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* |
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* Send a SKIP ROM follow by a CONVERT T commmand on the bus. |
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* It also set the status flag in each slave &struct w1_therm_family_data |
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* to signal that a conversion is in progress. |
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* |
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* Return: 0 if success, -kernel error code otherwise |
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*/ |
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static int trigger_bulk_read(struct w1_master *dev_master); |
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/* Sysfs interface declaration */ |
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static ssize_t w1_slave_show(struct device *device, |
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struct device_attribute *attr, char *buf); |
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static ssize_t w1_slave_store(struct device *device, |
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struct device_attribute *attr, const char *buf, size_t size); |
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static ssize_t w1_seq_show(struct device *device, |
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struct device_attribute *attr, char *buf); |
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static ssize_t temperature_show(struct device *device, |
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struct device_attribute *attr, char *buf); |
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static ssize_t ext_power_show(struct device *device, |
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struct device_attribute *attr, char *buf); |
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static ssize_t resolution_show(struct device *device, |
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struct device_attribute *attr, char *buf); |
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static ssize_t resolution_store(struct device *device, |
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struct device_attribute *attr, const char *buf, size_t size); |
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static ssize_t eeprom_cmd_store(struct device *device, |
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struct device_attribute *attr, const char *buf, size_t size); |
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static ssize_t alarms_store(struct device *device, |
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struct device_attribute *attr, const char *buf, size_t size); |
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static ssize_t alarms_show(struct device *device, |
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struct device_attribute *attr, char *buf); |
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static ssize_t therm_bulk_read_store(struct device *device, |
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struct device_attribute *attr, const char *buf, size_t size); |
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static ssize_t therm_bulk_read_show(struct device *device, |
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struct device_attribute *attr, char *buf); |
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static ssize_t conv_time_show(struct device *device, |
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struct device_attribute *attr, char *buf); |
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static ssize_t conv_time_store(struct device *device, |
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struct device_attribute *attr, const char *buf, |
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size_t size); |
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static ssize_t features_show(struct device *device, |
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struct device_attribute *attr, char *buf); |
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static ssize_t features_store(struct device *device, |
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struct device_attribute *attr, const char *buf, |
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size_t size); |
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/* Attributes declarations */ |
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static DEVICE_ATTR_RW(w1_slave); |
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static DEVICE_ATTR_RO(w1_seq); |
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static DEVICE_ATTR_RO(temperature); |
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static DEVICE_ATTR_RO(ext_power); |
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static DEVICE_ATTR_RW(resolution); |
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static DEVICE_ATTR_WO(eeprom_cmd); |
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static DEVICE_ATTR_RW(alarms); |
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static DEVICE_ATTR_RW(conv_time); |
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static DEVICE_ATTR_RW(features); |
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static DEVICE_ATTR_RW(therm_bulk_read); /* attribut at master level */ |
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/* Interface Functions declaration */ |
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/** |
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* w1_therm_add_slave() - Called when a new slave is discovered |
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* @sl: slave just discovered by the master. |
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* |
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* Called by the master when the slave is discovered on the bus. Used to |
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* initialize slave state before the beginning of any communication. |
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* |
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* Return: 0 - If success, negative kernel code otherwise |
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*/ |
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static int w1_therm_add_slave(struct w1_slave *sl); |
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/** |
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* w1_therm_remove_slave() - Called when a slave is removed |
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* @sl: slave to be removed. |
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* |
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* Called by the master when the slave is considered not to be on the bus |
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* anymore. Used to free memory. |
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*/ |
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static void w1_therm_remove_slave(struct w1_slave *sl); |
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/* Family attributes */ |
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static struct attribute *w1_therm_attrs[] = { |
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&dev_attr_w1_slave.attr, |
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&dev_attr_temperature.attr, |
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&dev_attr_ext_power.attr, |
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&dev_attr_resolution.attr, |
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&dev_attr_eeprom_cmd.attr, |
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&dev_attr_alarms.attr, |
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&dev_attr_conv_time.attr, |
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&dev_attr_features.attr, |
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NULL, |
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}; |
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static struct attribute *w1_ds18s20_attrs[] = { |
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&dev_attr_w1_slave.attr, |
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&dev_attr_temperature.attr, |
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&dev_attr_ext_power.attr, |
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&dev_attr_eeprom_cmd.attr, |
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&dev_attr_alarms.attr, |
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&dev_attr_conv_time.attr, |
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&dev_attr_features.attr, |
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NULL, |
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}; |
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static struct attribute *w1_ds28ea00_attrs[] = { |
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&dev_attr_w1_slave.attr, |
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&dev_attr_w1_seq.attr, |
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&dev_attr_temperature.attr, |
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&dev_attr_ext_power.attr, |
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&dev_attr_resolution.attr, |
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&dev_attr_eeprom_cmd.attr, |
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&dev_attr_alarms.attr, |
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&dev_attr_conv_time.attr, |
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&dev_attr_features.attr, |
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NULL, |
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}; |
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/* Attribute groups */ |
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ATTRIBUTE_GROUPS(w1_therm); |
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ATTRIBUTE_GROUPS(w1_ds18s20); |
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ATTRIBUTE_GROUPS(w1_ds28ea00); |
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#if IS_REACHABLE(CONFIG_HWMON) |
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static int w1_read_temp(struct device *dev, u32 attr, int channel, |
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long *val); |
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static umode_t w1_is_visible(const void *_data, enum hwmon_sensor_types type, |
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u32 attr, int channel) |
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{ |
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return attr == hwmon_temp_input ? 0444 : 0; |
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} |
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static int w1_read(struct device *dev, enum hwmon_sensor_types type, |
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u32 attr, int channel, long *val) |
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{ |
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switch (type) { |
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case hwmon_temp: |
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return w1_read_temp(dev, attr, channel, val); |
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default: |
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return -EOPNOTSUPP; |
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} |
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} |
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static const u32 w1_temp_config[] = { |
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HWMON_T_INPUT, |
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0 |
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}; |
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static const struct hwmon_channel_info w1_temp = { |
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.type = hwmon_temp, |
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.config = w1_temp_config, |
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}; |
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static const struct hwmon_channel_info *w1_info[] = { |
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&w1_temp, |
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NULL |
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}; |
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static const struct hwmon_ops w1_hwmon_ops = { |
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.is_visible = w1_is_visible, |
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.read = w1_read, |
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}; |
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static const struct hwmon_chip_info w1_chip_info = { |
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.ops = &w1_hwmon_ops, |
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.info = w1_info, |
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}; |
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#define W1_CHIPINFO (&w1_chip_info) |
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#else |
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#define W1_CHIPINFO NULL |
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#endif |
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/* Family operations */ |
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static const struct w1_family_ops w1_therm_fops = { |
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.add_slave = w1_therm_add_slave, |
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.remove_slave = w1_therm_remove_slave, |
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.groups = w1_therm_groups, |
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.chip_info = W1_CHIPINFO, |
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}; |
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static const struct w1_family_ops w1_ds18s20_fops = { |
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.add_slave = w1_therm_add_slave, |
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.remove_slave = w1_therm_remove_slave, |
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.groups = w1_ds18s20_groups, |
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.chip_info = W1_CHIPINFO, |
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}; |
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static const struct w1_family_ops w1_ds28ea00_fops = { |
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.add_slave = w1_therm_add_slave, |
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.remove_slave = w1_therm_remove_slave, |
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.groups = w1_ds28ea00_groups, |
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.chip_info = W1_CHIPINFO, |
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}; |
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/* Family binding operations struct */ |
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static struct w1_family w1_therm_family_DS18S20 = { |
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.fid = W1_THERM_DS18S20, |
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.fops = &w1_ds18s20_fops, |
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}; |
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static struct w1_family w1_therm_family_DS18B20 = { |
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.fid = W1_THERM_DS18B20, |
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.fops = &w1_therm_fops, |
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}; |
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static struct w1_family w1_therm_family_DS1822 = { |
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.fid = W1_THERM_DS1822, |
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.fops = &w1_therm_fops, |
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}; |
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static struct w1_family w1_therm_family_DS28EA00 = { |
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.fid = W1_THERM_DS28EA00, |
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.fops = &w1_ds28ea00_fops, |
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}; |
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static struct w1_family w1_therm_family_DS1825 = { |
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.fid = W1_THERM_DS1825, |
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.fops = &w1_therm_fops, |
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}; |
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/* Device dependent func */ |
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static inline int w1_DS18B20_convert_time(struct w1_slave *sl) |
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{ |
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int ret; |
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|
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if (!sl->family_data) |
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return -ENODEV; /* device unknown */ |
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if (SLAVE_CONV_TIME_OVERRIDE(sl) != CONV_TIME_DEFAULT) |
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return SLAVE_CONV_TIME_OVERRIDE(sl); |
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|
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/* Return the conversion time, depending on resolution, |
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* select maximum conversion time among all compatible devices |
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*/ |
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switch (SLAVE_RESOLUTION(sl)) { |
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case 9: |
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ret = 95; |
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break; |
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case 10: |
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ret = 190; |
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break; |
|
case 11: |
|
ret = 375; |
|
break; |
|
case 12: |
|
ret = 750; |
|
break; |
|
case 13: |
|
ret = 850; /* GX20MH01 only. Datasheet says 500ms, but that's not enough. */ |
|
break; |
|
case 14: |
|
ret = 1600; /* GX20MH01 only. Datasheet says 1000ms - not enough */ |
|
break; |
|
default: |
|
ret = 750; |
|
} |
|
return ret; |
|
} |
|
|
|
static inline int w1_DS18S20_convert_time(struct w1_slave *sl) |
|
{ |
|
if (!sl->family_data) |
|
return -ENODEV; /* device unknown */ |
|
|
|
if (SLAVE_CONV_TIME_OVERRIDE(sl) == CONV_TIME_DEFAULT) |
|
return 750; /* default for DS18S20 */ |
|
else |
|
return SLAVE_CONV_TIME_OVERRIDE(sl); |
|
} |
|
|
|
static inline int w1_DS18B20_write_data(struct w1_slave *sl, |
|
const u8 *data) |
|
{ |
|
return write_scratchpad(sl, data, 3); |
|
} |
|
|
|
static inline int w1_DS18S20_write_data(struct w1_slave *sl, |
|
const u8 *data) |
|
{ |
|
/* No config register */ |
|
return write_scratchpad(sl, data, 2); |
|
} |
|
|
|
static inline int w1_DS18B20_set_resolution(struct w1_slave *sl, int val) |
|
{ |
|
int ret; |
|
struct therm_info info, info2; |
|
|
|
/* DS18B20 resolution is 9 to 12 bits */ |
|
/* GX20MH01 resolution is 9 to 14 bits */ |
|
if (val < W1_THERM_RESOLUTION_MIN || val > W1_THERM_RESOLUTION_MAX) |
|
return -EINVAL; |
|
|
|
/* Calc bit value from resolution */ |
|
val = (val - W1_THERM_RESOLUTION_MIN) << W1_THERM_RESOLUTION_SHIFT; |
|
|
|
/* |
|
* Read the scratchpad to change only the required bits |
|
* (bit5 & bit 6 from byte 4) |
|
*/ |
|
ret = read_scratchpad(sl, &info); |
|
|
|
if (ret) |
|
return ret; |
|
|
|
|
|
info.rom[4] &= ~W1_THERM_RESOLUTION_MASK; |
|
info.rom[4] |= val; |
|
|
|
/* Write data in the device RAM */ |
|
ret = w1_DS18B20_write_data(sl, info.rom + 2); |
|
if (ret) |
|
return ret; |
|
|
|
/* Have to read back the resolution to verify an actual value |
|
* GX20MH01 and DS18B20 are indistinguishable by family number, but resolutions differ |
|
* Some DS18B20 clones don't support resolution change |
|
*/ |
|
ret = read_scratchpad(sl, &info2); |
|
if (ret) |
|
/* Scratchpad read fail */ |
|
return ret; |
|
|
|
if ((info2.rom[4] & W1_THERM_RESOLUTION_MASK) == (info.rom[4] & W1_THERM_RESOLUTION_MASK)) |
|
return 0; |
|
|
|
/* Resolution verify error */ |
|
return -EIO; |
|
} |
|
|
|
static inline int w1_DS18B20_get_resolution(struct w1_slave *sl) |
|
{ |
|
int ret; |
|
int resolution; |
|
struct therm_info info; |
|
|
|
ret = read_scratchpad(sl, &info); |
|
|
|
if (ret) |
|
return ret; |
|
|
|
resolution = ((info.rom[4] & W1_THERM_RESOLUTION_MASK) >> W1_THERM_RESOLUTION_SHIFT) |
|
+ W1_THERM_RESOLUTION_MIN; |
|
/* GX20MH01 has one special case: |
|
* >=14 means 14 bits when getting resolution from bit value. |
|
* Other devices have no more then 12 bits. |
|
*/ |
|
if (resolution > W1_THERM_RESOLUTION_MAX) |
|
resolution = W1_THERM_RESOLUTION_MAX; |
|
|
|
return resolution; |
|
} |
|
|
|
/** |
|
* w1_DS18B20_convert_temp() - temperature computation for DS18B20 |
|
* @rom: data read from device RAM (8 data bytes + 1 CRC byte) |
|
* |
|
* Can be called for any DS18B20 compliant device. |
|
* |
|
* Return: value in millidegrees Celsius. |
|
*/ |
|
static inline int w1_DS18B20_convert_temp(u8 rom[9]) |
|
{ |
|
u16 bv; |
|
s16 t; |
|
|
|
/* Signed 16-bit value to unsigned, cpu order */ |
|
bv = le16_to_cpup((__le16 *)rom); |
|
|
|
/* Config register bit R2 = 1 - GX20MH01 in 13 or 14 bit resolution mode */ |
|
if (rom[4] & 0x80) { |
|
/* Insert two temperature bits from config register */ |
|
/* Avoid arithmetic shift of signed value */ |
|
bv = (bv << 2) | (rom[4] & 3); |
|
t = (s16) bv; /* Degrees, lowest bit is 2^-6 */ |
|
return (int)t * 1000 / 64; /* Sign-extend to int; millidegrees */ |
|
} |
|
t = (s16)bv; /* Degrees, lowest bit is 2^-4 */ |
|
return (int)t * 1000 / 16; /* Sign-extend to int; millidegrees */ |
|
} |
|
|
|
/** |
|
* w1_DS18S20_convert_temp() - temperature computation for DS18S20 |
|
* @rom: data read from device RAM (8 data bytes + 1 CRC byte) |
|
* |
|
* Can be called for any DS18S20 compliant device. |
|
* |
|
* Return: value in millidegrees Celsius. |
|
*/ |
|
static inline int w1_DS18S20_convert_temp(u8 rom[9]) |
|
{ |
|
int t, h; |
|
|
|
if (!rom[7]) { |
|
pr_debug("%s: Invalid argument for conversion\n", __func__); |
|
return 0; |
|
} |
|
|
|
if (rom[1] == 0) |
|
t = ((s32)rom[0] >> 1)*1000; |
|
else |
|
t = 1000*(-1*(s32)(0x100-rom[0]) >> 1); |
|
|
|
t -= 250; |
|
h = 1000*((s32)rom[7] - (s32)rom[6]); |
|
h /= (s32)rom[7]; |
|
t += h; |
|
|
|
return t; |
|
} |
|
|
|
/* Device capability description */ |
|
/* GX20MH01 device shares family number and structure with DS18B20 */ |
|
|
|
static struct w1_therm_family_converter w1_therm_families[] = { |
|
{ |
|
.f = &w1_therm_family_DS18S20, |
|
.convert = w1_DS18S20_convert_temp, |
|
.get_conversion_time = w1_DS18S20_convert_time, |
|
.set_resolution = NULL, /* no config register */ |
|
.get_resolution = NULL, /* no config register */ |
|
.write_data = w1_DS18S20_write_data, |
|
.bulk_read = true |
|
}, |
|
{ |
|
.f = &w1_therm_family_DS1822, |
|
.convert = w1_DS18B20_convert_temp, |
|
.get_conversion_time = w1_DS18B20_convert_time, |
|
.set_resolution = w1_DS18B20_set_resolution, |
|
.get_resolution = w1_DS18B20_get_resolution, |
|
.write_data = w1_DS18B20_write_data, |
|
.bulk_read = true |
|
}, |
|
{ |
|
/* Also used for GX20MH01 */ |
|
.f = &w1_therm_family_DS18B20, |
|
.convert = w1_DS18B20_convert_temp, |
|
.get_conversion_time = w1_DS18B20_convert_time, |
|
.set_resolution = w1_DS18B20_set_resolution, |
|
.get_resolution = w1_DS18B20_get_resolution, |
|
.write_data = w1_DS18B20_write_data, |
|
.bulk_read = true |
|
}, |
|
{ |
|
.f = &w1_therm_family_DS28EA00, |
|
.convert = w1_DS18B20_convert_temp, |
|
.get_conversion_time = w1_DS18B20_convert_time, |
|
.set_resolution = w1_DS18B20_set_resolution, |
|
.get_resolution = w1_DS18B20_get_resolution, |
|
.write_data = w1_DS18B20_write_data, |
|
.bulk_read = false |
|
}, |
|
{ |
|
.f = &w1_therm_family_DS1825, |
|
.convert = w1_DS18B20_convert_temp, |
|
.get_conversion_time = w1_DS18B20_convert_time, |
|
.set_resolution = w1_DS18B20_set_resolution, |
|
.get_resolution = w1_DS18B20_get_resolution, |
|
.write_data = w1_DS18B20_write_data, |
|
.bulk_read = true |
|
} |
|
}; |
|
|
|
/* Helpers Functions */ |
|
|
|
/** |
|
* device_family() - Retrieve a pointer on &struct w1_therm_family_converter |
|
* @sl: slave to retrieve the device specific structure |
|
* |
|
* Return: pointer to the slaves's family converter, NULL if not known |
|
*/ |
|
static struct w1_therm_family_converter *device_family(struct w1_slave *sl) |
|
{ |
|
struct w1_therm_family_converter *ret = NULL; |
|
int i; |
|
|
|
for (i = 0; i < ARRAY_SIZE(w1_therm_families); ++i) { |
|
if (w1_therm_families[i].f->fid == sl->family->fid) { |
|
ret = &w1_therm_families[i]; |
|
break; |
|
} |
|
} |
|
return ret; |
|
} |
|
|
|
/** |
|
* bus_mutex_lock() - Acquire the mutex |
|
* @lock: w1 bus mutex to acquire |
|
* |
|
* It try to acquire the mutex W1_THERM_MAX_TRY times and wait |
|
* W1_THERM_RETRY_DELAY between 2 attempts. |
|
* |
|
* Return: true is mutex is acquired and lock, false otherwise |
|
*/ |
|
static inline bool bus_mutex_lock(struct mutex *lock) |
|
{ |
|
int max_trying = W1_THERM_MAX_TRY; |
|
|
|
/* try to acquire the mutex, if not, sleep retry_delay before retry) */ |
|
while (mutex_lock_interruptible(lock) != 0 && max_trying > 0) { |
|
unsigned long sleep_rem; |
|
|
|
sleep_rem = msleep_interruptible(W1_THERM_RETRY_DELAY); |
|
if (!sleep_rem) |
|
max_trying--; |
|
} |
|
|
|
if (!max_trying) |
|
return false; /* Didn't acquire the bus mutex */ |
|
|
|
return true; |
|
} |
|
|
|
/** |
|
* check_family_data() - Check if family data and specific functions are present |
|
* @sl: W1 device data |
|
* |
|
* Return: 0 - OK, negative value - error |
|
*/ |
|
static int check_family_data(struct w1_slave *sl) |
|
{ |
|
if ((!sl->family_data) || (!SLAVE_SPECIFIC_FUNC(sl))) { |
|
dev_info(&sl->dev, |
|
"%s: Device is not supported by the driver\n", __func__); |
|
return -EINVAL; /* No device family */ |
|
} |
|
return 0; |
|
} |
|
|
|
/** |
|
* support_bulk_read() - check if slave support bulk read |
|
* @sl: device to check the ability |
|
* |
|
* Return: true if bulk read is supported, false if not or error |
|
*/ |
|
static inline bool bulk_read_support(struct w1_slave *sl) |
|
{ |
|
if (SLAVE_SPECIFIC_FUNC(sl)) |
|
return SLAVE_SPECIFIC_FUNC(sl)->bulk_read; |
|
|
|
dev_info(&sl->dev, |
|
"%s: Device not supported by the driver\n", __func__); |
|
|
|
return false; /* No device family */ |
|
} |
|
|
|
/** |
|
* conversion_time() - get the Tconv for the slave |
|
* @sl: device to get the conversion time |
|
* |
|
* On device supporting resolution settings, conversion time depend |
|
* on the resolution setting. This helper function get the slave timing, |
|
* depending on its current setting. |
|
* |
|
* Return: conversion time in ms, negative values are kernel error code |
|
*/ |
|
static inline int conversion_time(struct w1_slave *sl) |
|
{ |
|
if (SLAVE_SPECIFIC_FUNC(sl)) |
|
return SLAVE_SPECIFIC_FUNC(sl)->get_conversion_time(sl); |
|
|
|
dev_info(&sl->dev, |
|
"%s: Device not supported by the driver\n", __func__); |
|
|
|
return -ENODEV; /* No device family */ |
|
} |
|
|
|
/** |
|
* temperature_from_RAM() - Convert the read info to temperature |
|
* @sl: device that sent the RAM data |
|
* @rom: read value on the slave device RAM |
|
* |
|
* Device dependent, the function bind the correct computation method. |
|
* |
|
* Return: temperature in 1/1000degC, 0 on error. |
|
*/ |
|
static inline int temperature_from_RAM(struct w1_slave *sl, u8 rom[9]) |
|
{ |
|
if (SLAVE_SPECIFIC_FUNC(sl)) |
|
return SLAVE_SPECIFIC_FUNC(sl)->convert(rom); |
|
|
|
dev_info(&sl->dev, |
|
"%s: Device not supported by the driver\n", __func__); |
|
|
|
return 0; /* No device family */ |
|
} |
|
|
|
/** |
|
* int_to_short() - Safe casting of int to short |
|
* |
|
* @i: integer to be converted to short |
|
* |
|
* Device register use 1 byte to store signed integer. |
|
* This helper function convert the int in a signed short, |
|
* using the min/max values that device can measure as limits. |
|
* min/max values are defined by macro. |
|
* |
|
* Return: a short in the range of min/max value |
|
*/ |
|
static inline s8 int_to_short(int i) |
|
{ |
|
/* Prepare to cast to short by eliminating out of range values */ |
|
i = i > MAX_TEMP ? MAX_TEMP : i; |
|
i = i < MIN_TEMP ? MIN_TEMP : i; |
|
return (s8) i; |
|
} |
|
|
|
/* Interface Functions */ |
|
|
|
static int w1_therm_add_slave(struct w1_slave *sl) |
|
{ |
|
struct w1_therm_family_converter *sl_family_conv; |
|
|
|
/* Allocate memory */ |
|
sl->family_data = kzalloc(sizeof(struct w1_therm_family_data), |
|
GFP_KERNEL); |
|
if (!sl->family_data) |
|
return -ENOMEM; |
|
|
|
atomic_set(THERM_REFCNT(sl->family_data), 1); |
|
|
|
/* Get a pointer to the device specific function struct */ |
|
sl_family_conv = device_family(sl); |
|
if (!sl_family_conv) { |
|
kfree(sl->family_data); |
|
return -ENODEV; |
|
} |
|
/* save this pointer to the device structure */ |
|
SLAVE_SPECIFIC_FUNC(sl) = sl_family_conv; |
|
|
|
if (bulk_read_support(sl)) { |
|
/* |
|
* add the sys entry to trigger bulk_read |
|
* at master level only the 1st time |
|
*/ |
|
if (!bulk_read_device_counter) { |
|
int err = device_create_file(&sl->master->dev, |
|
&dev_attr_therm_bulk_read); |
|
|
|
if (err) |
|
dev_warn(&sl->dev, |
|
"%s: Device has been added, but bulk read is unavailable. err=%d\n", |
|
__func__, err); |
|
} |
|
/* Increment the counter */ |
|
bulk_read_device_counter++; |
|
} |
|
|
|
/* Getting the power mode of the device {external, parasite} */ |
|
SLAVE_POWERMODE(sl) = read_powermode(sl); |
|
|
|
if (SLAVE_POWERMODE(sl) < 0) { |
|
/* no error returned as device has been added */ |
|
dev_warn(&sl->dev, |
|
"%s: Device has been added, but power_mode may be corrupted. err=%d\n", |
|
__func__, SLAVE_POWERMODE(sl)); |
|
} |
|
|
|
/* Getting the resolution of the device */ |
|
if (SLAVE_SPECIFIC_FUNC(sl)->get_resolution) { |
|
SLAVE_RESOLUTION(sl) = |
|
SLAVE_SPECIFIC_FUNC(sl)->get_resolution(sl); |
|
if (SLAVE_RESOLUTION(sl) < 0) { |
|
/* no error returned as device has been added */ |
|
dev_warn(&sl->dev, |
|
"%s:Device has been added, but resolution may be corrupted. err=%d\n", |
|
__func__, SLAVE_RESOLUTION(sl)); |
|
} |
|
} |
|
|
|
/* Finally initialize convert_triggered flag */ |
|
SLAVE_CONVERT_TRIGGERED(sl) = 0; |
|
|
|
return 0; |
|
} |
|
|
|
static void w1_therm_remove_slave(struct w1_slave *sl) |
|
{ |
|
int refcnt = atomic_sub_return(1, THERM_REFCNT(sl->family_data)); |
|
|
|
if (bulk_read_support(sl)) { |
|
bulk_read_device_counter--; |
|
/* Delete the entry if no more device support the feature */ |
|
if (!bulk_read_device_counter) |
|
device_remove_file(&sl->master->dev, |
|
&dev_attr_therm_bulk_read); |
|
} |
|
|
|
while (refcnt) { |
|
msleep(1000); |
|
refcnt = atomic_read(THERM_REFCNT(sl->family_data)); |
|
} |
|
kfree(sl->family_data); |
|
sl->family_data = NULL; |
|
} |
|
|
|
/* Hardware Functions */ |
|
|
|
/* Safe version of reset_select_slave - avoid using the one in w_io.c */ |
|
static int reset_select_slave(struct w1_slave *sl) |
|
{ |
|
u8 match[9] = { W1_MATCH_ROM, }; |
|
u64 rn = le64_to_cpu(*((u64 *)&sl->reg_num)); |
|
|
|
if (w1_reset_bus(sl->master)) |
|
return -ENODEV; |
|
|
|
memcpy(&match[1], &rn, 8); |
|
w1_write_block(sl->master, match, 9); |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* w1_poll_completion - Poll for operation completion, with timeout |
|
* @dev_master: the device master of the bus |
|
* @tout_ms: timeout in milliseconds |
|
* |
|
* The device is answering 0's while an operation is in progress and 1's after it completes |
|
* Timeout may happen if the previous command was not recognised due to a line noise |
|
* |
|
* Return: 0 - OK, negative error - timeout |
|
*/ |
|
static int w1_poll_completion(struct w1_master *dev_master, int tout_ms) |
|
{ |
|
int i; |
|
|
|
for (i = 0; i < tout_ms/W1_POLL_PERIOD; i++) { |
|
/* Delay is before poll, for device to recognize a command */ |
|
msleep(W1_POLL_PERIOD); |
|
|
|
/* Compare all 8 bits to mitigate a noise on the bus */ |
|
if (w1_read_8(dev_master) == 0xFF) |
|
break; |
|
} |
|
if (i == tout_ms/W1_POLL_PERIOD) |
|
return -EIO; |
|
|
|
return 0; |
|
} |
|
|
|
static int convert_t(struct w1_slave *sl, struct therm_info *info) |
|
{ |
|
struct w1_master *dev_master = sl->master; |
|
int max_trying = W1_THERM_MAX_TRY; |
|
int t_conv; |
|
int ret = -ENODEV; |
|
bool strong_pullup; |
|
|
|
if (!sl->family_data) |
|
goto error; |
|
|
|
strong_pullup = (w1_strong_pullup == 2 || |
|
(!SLAVE_POWERMODE(sl) && |
|
w1_strong_pullup)); |
|
|
|
if (strong_pullup && SLAVE_FEATURES(sl) & W1_THERM_POLL_COMPLETION) { |
|
dev_warn(&sl->dev, |
|
"%s: Disabling W1_THERM_POLL_COMPLETION in parasite power mode.\n", |
|
__func__); |
|
SLAVE_FEATURES(sl) &= ~W1_THERM_POLL_COMPLETION; |
|
} |
|
|
|
/* get conversion duration device and id dependent */ |
|
t_conv = conversion_time(sl); |
|
|
|
memset(info->rom, 0, sizeof(info->rom)); |
|
|
|
/* prevent the slave from going away in sleep */ |
|
atomic_inc(THERM_REFCNT(sl->family_data)); |
|
|
|
if (!bus_mutex_lock(&dev_master->bus_mutex)) { |
|
ret = -EAGAIN; /* Didn't acquire the mutex */ |
|
goto dec_refcnt; |
|
} |
|
|
|
while (max_trying-- && ret) { /* ret should be 0 */ |
|
|
|
info->verdict = 0; |
|
info->crc = 0; |
|
/* safe version to select slave */ |
|
if (!reset_select_slave(sl)) { |
|
unsigned long sleep_rem; |
|
|
|
/* 750ms strong pullup (or delay) after the convert */ |
|
if (strong_pullup) |
|
w1_next_pullup(dev_master, t_conv); |
|
|
|
w1_write_8(dev_master, W1_CONVERT_TEMP); |
|
|
|
if (strong_pullup) { /*some device need pullup */ |
|
sleep_rem = msleep_interruptible(t_conv); |
|
if (sleep_rem != 0) { |
|
ret = -EINTR; |
|
goto mt_unlock; |
|
} |
|
mutex_unlock(&dev_master->bus_mutex); |
|
} else { /*no device need pullup */ |
|
if (SLAVE_FEATURES(sl) & W1_THERM_POLL_COMPLETION) { |
|
ret = w1_poll_completion(dev_master, W1_POLL_CONVERT_TEMP); |
|
if (ret) { |
|
dev_dbg(&sl->dev, "%s: Timeout\n", __func__); |
|
goto mt_unlock; |
|
} |
|
mutex_unlock(&dev_master->bus_mutex); |
|
} else { |
|
/* Fixed delay */ |
|
mutex_unlock(&dev_master->bus_mutex); |
|
sleep_rem = msleep_interruptible(t_conv); |
|
if (sleep_rem != 0) { |
|
ret = -EINTR; |
|
goto dec_refcnt; |
|
} |
|
} |
|
} |
|
ret = read_scratchpad(sl, info); |
|
|
|
/* If enabled, check for conversion success */ |
|
if ((SLAVE_FEATURES(sl) & W1_THERM_CHECK_RESULT) && |
|
(info->rom[6] == 0xC) && |
|
((info->rom[1] == 0x5 && info->rom[0] == 0x50) || |
|
(info->rom[1] == 0x7 && info->rom[0] == 0xFF)) |
|
) { |
|
/* Invalid reading (scratchpad byte 6 = 0xC) |
|
* due to insufficient conversion time |
|
* or power failure. |
|
*/ |
|
ret = -EIO; |
|
} |
|
|
|
goto dec_refcnt; |
|
} |
|
|
|
} |
|
|
|
mt_unlock: |
|
mutex_unlock(&dev_master->bus_mutex); |
|
dec_refcnt: |
|
atomic_dec(THERM_REFCNT(sl->family_data)); |
|
error: |
|
return ret; |
|
} |
|
|
|
static int conv_time_measure(struct w1_slave *sl, int *conv_time) |
|
{ |
|
struct therm_info inf, |
|
*info = &inf; |
|
struct w1_master *dev_master = sl->master; |
|
int max_trying = W1_THERM_MAX_TRY; |
|
int ret = -ENODEV; |
|
bool strong_pullup; |
|
|
|
if (!sl->family_data) |
|
goto error; |
|
|
|
strong_pullup = (w1_strong_pullup == 2 || |
|
(!SLAVE_POWERMODE(sl) && |
|
w1_strong_pullup)); |
|
|
|
if (strong_pullup) { |
|
pr_info("%s: Measure with strong_pullup is not supported.\n", __func__); |
|
return -EINVAL; |
|
} |
|
|
|
memset(info->rom, 0, sizeof(info->rom)); |
|
|
|
/* prevent the slave from going away in sleep */ |
|
atomic_inc(THERM_REFCNT(sl->family_data)); |
|
|
|
if (!bus_mutex_lock(&dev_master->bus_mutex)) { |
|
ret = -EAGAIN; /* Didn't acquire the mutex */ |
|
goto dec_refcnt; |
|
} |
|
|
|
while (max_trying-- && ret) { /* ret should be 0 */ |
|
info->verdict = 0; |
|
info->crc = 0; |
|
/* safe version to select slave */ |
|
if (!reset_select_slave(sl)) { |
|
int j_start, j_end; |
|
|
|
/*no device need pullup */ |
|
w1_write_8(dev_master, W1_CONVERT_TEMP); |
|
|
|
j_start = jiffies; |
|
ret = w1_poll_completion(dev_master, W1_POLL_CONVERT_TEMP); |
|
if (ret) { |
|
dev_dbg(&sl->dev, "%s: Timeout\n", __func__); |
|
goto mt_unlock; |
|
} |
|
j_end = jiffies; |
|
/* 1.2x increase for variation and changes over temperature range */ |
|
*conv_time = jiffies_to_msecs(j_end-j_start)*12/10; |
|
pr_debug("W1 Measure complete, conv_time = %d, HZ=%d.\n", |
|
*conv_time, HZ); |
|
if (*conv_time <= CONV_TIME_MEASURE) { |
|
ret = -EIO; |
|
goto mt_unlock; |
|
} |
|
mutex_unlock(&dev_master->bus_mutex); |
|
ret = read_scratchpad(sl, info); |
|
goto dec_refcnt; |
|
} |
|
|
|
} |
|
mt_unlock: |
|
mutex_unlock(&dev_master->bus_mutex); |
|
dec_refcnt: |
|
atomic_dec(THERM_REFCNT(sl->family_data)); |
|
error: |
|
return ret; |
|
} |
|
|
|
static int read_scratchpad(struct w1_slave *sl, struct therm_info *info) |
|
{ |
|
struct w1_master *dev_master = sl->master; |
|
int max_trying = W1_THERM_MAX_TRY; |
|
int ret = -ENODEV; |
|
|
|
info->verdict = 0; |
|
|
|
if (!sl->family_data) |
|
goto error; |
|
|
|
memset(info->rom, 0, sizeof(info->rom)); |
|
|
|
/* prevent the slave from going away in sleep */ |
|
atomic_inc(THERM_REFCNT(sl->family_data)); |
|
|
|
if (!bus_mutex_lock(&dev_master->bus_mutex)) { |
|
ret = -EAGAIN; /* Didn't acquire the mutex */ |
|
goto dec_refcnt; |
|
} |
|
|
|
while (max_trying-- && ret) { /* ret should be 0 */ |
|
/* safe version to select slave */ |
|
if (!reset_select_slave(sl)) { |
|
u8 nb_bytes_read; |
|
|
|
w1_write_8(dev_master, W1_READ_SCRATCHPAD); |
|
|
|
nb_bytes_read = w1_read_block(dev_master, info->rom, 9); |
|
if (nb_bytes_read != 9) { |
|
dev_warn(&sl->dev, |
|
"w1_read_block(): returned %u instead of 9.\n", |
|
nb_bytes_read); |
|
ret = -EIO; |
|
} |
|
|
|
info->crc = w1_calc_crc8(info->rom, 8); |
|
|
|
if (info->rom[8] == info->crc) { |
|
info->verdict = 1; |
|
ret = 0; |
|
} else |
|
ret = -EIO; /* CRC not checked */ |
|
} |
|
|
|
} |
|
mutex_unlock(&dev_master->bus_mutex); |
|
|
|
dec_refcnt: |
|
atomic_dec(THERM_REFCNT(sl->family_data)); |
|
error: |
|
return ret; |
|
} |
|
|
|
static int write_scratchpad(struct w1_slave *sl, const u8 *data, u8 nb_bytes) |
|
{ |
|
struct w1_master *dev_master = sl->master; |
|
int max_trying = W1_THERM_MAX_TRY; |
|
int ret = -ENODEV; |
|
|
|
if (!sl->family_data) |
|
goto error; |
|
|
|
/* prevent the slave from going away in sleep */ |
|
atomic_inc(THERM_REFCNT(sl->family_data)); |
|
|
|
if (!bus_mutex_lock(&dev_master->bus_mutex)) { |
|
ret = -EAGAIN; /* Didn't acquire the mutex */ |
|
goto dec_refcnt; |
|
} |
|
|
|
while (max_trying-- && ret) { /* ret should be 0 */ |
|
/* safe version to select slave */ |
|
if (!reset_select_slave(sl)) { |
|
w1_write_8(dev_master, W1_WRITE_SCRATCHPAD); |
|
w1_write_block(dev_master, data, nb_bytes); |
|
ret = 0; |
|
} |
|
} |
|
mutex_unlock(&dev_master->bus_mutex); |
|
|
|
dec_refcnt: |
|
atomic_dec(THERM_REFCNT(sl->family_data)); |
|
error: |
|
return ret; |
|
} |
|
|
|
static int copy_scratchpad(struct w1_slave *sl) |
|
{ |
|
struct w1_master *dev_master = sl->master; |
|
int max_trying = W1_THERM_MAX_TRY; |
|
int t_write, ret = -ENODEV; |
|
bool strong_pullup; |
|
|
|
if (!sl->family_data) |
|
goto error; |
|
|
|
t_write = W1_THERM_EEPROM_WRITE_DELAY; |
|
strong_pullup = (w1_strong_pullup == 2 || |
|
(!SLAVE_POWERMODE(sl) && |
|
w1_strong_pullup)); |
|
|
|
/* prevent the slave from going away in sleep */ |
|
atomic_inc(THERM_REFCNT(sl->family_data)); |
|
|
|
if (!bus_mutex_lock(&dev_master->bus_mutex)) { |
|
ret = -EAGAIN; /* Didn't acquire the mutex */ |
|
goto dec_refcnt; |
|
} |
|
|
|
while (max_trying-- && ret) { /* ret should be 0 */ |
|
/* safe version to select slave */ |
|
if (!reset_select_slave(sl)) { |
|
unsigned long sleep_rem; |
|
|
|
/* 10ms strong pullup (or delay) after the convert */ |
|
if (strong_pullup) |
|
w1_next_pullup(dev_master, t_write); |
|
|
|
w1_write_8(dev_master, W1_COPY_SCRATCHPAD); |
|
|
|
if (strong_pullup) { |
|
sleep_rem = msleep_interruptible(t_write); |
|
if (sleep_rem != 0) { |
|
ret = -EINTR; |
|
goto mt_unlock; |
|
} |
|
} |
|
ret = 0; |
|
} |
|
|
|
} |
|
|
|
mt_unlock: |
|
mutex_unlock(&dev_master->bus_mutex); |
|
dec_refcnt: |
|
atomic_dec(THERM_REFCNT(sl->family_data)); |
|
error: |
|
return ret; |
|
} |
|
|
|
static int recall_eeprom(struct w1_slave *sl) |
|
{ |
|
struct w1_master *dev_master = sl->master; |
|
int max_trying = W1_THERM_MAX_TRY; |
|
int ret = -ENODEV; |
|
|
|
if (!sl->family_data) |
|
goto error; |
|
|
|
/* prevent the slave from going away in sleep */ |
|
atomic_inc(THERM_REFCNT(sl->family_data)); |
|
|
|
if (!bus_mutex_lock(&dev_master->bus_mutex)) { |
|
ret = -EAGAIN; /* Didn't acquire the mutex */ |
|
goto dec_refcnt; |
|
} |
|
|
|
while (max_trying-- && ret) { /* ret should be 0 */ |
|
/* safe version to select slave */ |
|
if (!reset_select_slave(sl)) { |
|
|
|
w1_write_8(dev_master, W1_RECALL_EEPROM); |
|
ret = w1_poll_completion(dev_master, W1_POLL_RECALL_EEPROM); |
|
} |
|
|
|
} |
|
|
|
mutex_unlock(&dev_master->bus_mutex); |
|
|
|
dec_refcnt: |
|
atomic_dec(THERM_REFCNT(sl->family_data)); |
|
error: |
|
return ret; |
|
} |
|
|
|
static int read_powermode(struct w1_slave *sl) |
|
{ |
|
struct w1_master *dev_master = sl->master; |
|
int max_trying = W1_THERM_MAX_TRY; |
|
int ret = -ENODEV; |
|
|
|
if (!sl->family_data) |
|
goto error; |
|
|
|
/* prevent the slave from going away in sleep */ |
|
atomic_inc(THERM_REFCNT(sl->family_data)); |
|
|
|
if (!bus_mutex_lock(&dev_master->bus_mutex)) { |
|
ret = -EAGAIN; /* Didn't acquire the mutex */ |
|
goto dec_refcnt; |
|
} |
|
|
|
while ((max_trying--) && (ret < 0)) { |
|
/* safe version to select slave */ |
|
if (!reset_select_slave(sl)) { |
|
w1_write_8(dev_master, W1_READ_PSUPPLY); |
|
/* |
|
* Emit a read time slot and read only one bit, |
|
* 1 is externally powered, |
|
* 0 is parasite powered |
|
*/ |
|
ret = w1_touch_bit(dev_master, 1); |
|
/* ret should be either 1 either 0 */ |
|
} |
|
} |
|
mutex_unlock(&dev_master->bus_mutex); |
|
|
|
dec_refcnt: |
|
atomic_dec(THERM_REFCNT(sl->family_data)); |
|
error: |
|
return ret; |
|
} |
|
|
|
static int trigger_bulk_read(struct w1_master *dev_master) |
|
{ |
|
struct w1_slave *sl = NULL; /* used to iterate through slaves */ |
|
int max_trying = W1_THERM_MAX_TRY; |
|
int t_conv = 0; |
|
int ret = -ENODEV; |
|
bool strong_pullup = false; |
|
|
|
/* |
|
* Check whether there are parasite powered device on the bus, |
|
* and compute duration of conversion for these devices |
|
* so we can apply a strong pullup if required |
|
*/ |
|
list_for_each_entry(sl, &dev_master->slist, w1_slave_entry) { |
|
if (!sl->family_data) |
|
goto error; |
|
if (bulk_read_support(sl)) { |
|
int t_cur = conversion_time(sl); |
|
|
|
t_conv = t_cur > t_conv ? t_cur : t_conv; |
|
strong_pullup = strong_pullup || |
|
(w1_strong_pullup == 2 || |
|
(!SLAVE_POWERMODE(sl) && |
|
w1_strong_pullup)); |
|
} |
|
} |
|
|
|
/* |
|
* t_conv is the max conversion time required on the bus |
|
* If its 0, no device support the bulk read feature |
|
*/ |
|
if (!t_conv) |
|
goto error; |
|
|
|
if (!bus_mutex_lock(&dev_master->bus_mutex)) { |
|
ret = -EAGAIN; /* Didn't acquire the mutex */ |
|
goto error; |
|
} |
|
|
|
while ((max_trying--) && (ret < 0)) { /* ret should be either 0 */ |
|
|
|
if (!w1_reset_bus(dev_master)) { /* Just reset the bus */ |
|
unsigned long sleep_rem; |
|
|
|
w1_write_8(dev_master, W1_SKIP_ROM); |
|
|
|
if (strong_pullup) /* Apply pullup if required */ |
|
w1_next_pullup(dev_master, t_conv); |
|
|
|
w1_write_8(dev_master, W1_CONVERT_TEMP); |
|
|
|
/* set a flag to instruct that converT pending */ |
|
list_for_each_entry(sl, |
|
&dev_master->slist, w1_slave_entry) { |
|
if (bulk_read_support(sl)) |
|
SLAVE_CONVERT_TRIGGERED(sl) = -1; |
|
} |
|
|
|
if (strong_pullup) { /* some device need pullup */ |
|
sleep_rem = msleep_interruptible(t_conv); |
|
if (sleep_rem != 0) { |
|
ret = -EINTR; |
|
goto mt_unlock; |
|
} |
|
mutex_unlock(&dev_master->bus_mutex); |
|
} else { |
|
mutex_unlock(&dev_master->bus_mutex); |
|
sleep_rem = msleep_interruptible(t_conv); |
|
if (sleep_rem != 0) { |
|
ret = -EINTR; |
|
goto set_flag; |
|
} |
|
} |
|
ret = 0; |
|
goto set_flag; |
|
} |
|
} |
|
|
|
mt_unlock: |
|
mutex_unlock(&dev_master->bus_mutex); |
|
set_flag: |
|
/* set a flag to register convsersion is done */ |
|
list_for_each_entry(sl, &dev_master->slist, w1_slave_entry) { |
|
if (bulk_read_support(sl)) |
|
SLAVE_CONVERT_TRIGGERED(sl) = 1; |
|
} |
|
error: |
|
return ret; |
|
} |
|
|
|
/* Sysfs Interface definition */ |
|
|
|
static ssize_t w1_slave_show(struct device *device, |
|
struct device_attribute *attr, char *buf) |
|
{ |
|
struct w1_slave *sl = dev_to_w1_slave(device); |
|
struct therm_info info; |
|
u8 *family_data = sl->family_data; |
|
int ret, i; |
|
ssize_t c = PAGE_SIZE; |
|
|
|
if (bulk_read_support(sl)) { |
|
if (SLAVE_CONVERT_TRIGGERED(sl) < 0) { |
|
dev_dbg(device, |
|
"%s: Conversion in progress, retry later\n", |
|
__func__); |
|
return 0; |
|
} else if (SLAVE_CONVERT_TRIGGERED(sl) > 0) { |
|
/* A bulk read has been issued, read the device RAM */ |
|
ret = read_scratchpad(sl, &info); |
|
SLAVE_CONVERT_TRIGGERED(sl) = 0; |
|
} else |
|
ret = convert_t(sl, &info); |
|
} else |
|
ret = convert_t(sl, &info); |
|
|
|
if (ret < 0) { |
|
dev_dbg(device, |
|
"%s: Temperature data may be corrupted. err=%d\n", |
|
__func__, ret); |
|
return 0; |
|
} |
|
|
|
for (i = 0; i < 9; ++i) |
|
c -= snprintf(buf + PAGE_SIZE - c, c, "%02x ", info.rom[i]); |
|
c -= snprintf(buf + PAGE_SIZE - c, c, ": crc=%02x %s\n", |
|
info.crc, (info.verdict) ? "YES" : "NO"); |
|
|
|
if (info.verdict) |
|
memcpy(family_data, info.rom, sizeof(info.rom)); |
|
else |
|
dev_warn(device, "%s:Read failed CRC check\n", __func__); |
|
|
|
for (i = 0; i < 9; ++i) |
|
c -= snprintf(buf + PAGE_SIZE - c, c, "%02x ", |
|
((u8 *)family_data)[i]); |
|
|
|
c -= snprintf(buf + PAGE_SIZE - c, c, "t=%d\n", |
|
temperature_from_RAM(sl, info.rom)); |
|
|
|
ret = PAGE_SIZE - c; |
|
return ret; |
|
} |
|
|
|
static ssize_t w1_slave_store(struct device *device, |
|
struct device_attribute *attr, const char *buf, |
|
size_t size) |
|
{ |
|
int val, ret = 0; |
|
struct w1_slave *sl = dev_to_w1_slave(device); |
|
|
|
ret = kstrtoint(buf, 10, &val); /* converting user entry to int */ |
|
|
|
if (ret) { /* conversion error */ |
|
dev_info(device, |
|
"%s: conversion error. err= %d\n", __func__, ret); |
|
return size; /* return size to avoid call back again */ |
|
} |
|
|
|
if ((!sl->family_data) || (!SLAVE_SPECIFIC_FUNC(sl))) { |
|
dev_info(device, |
|
"%s: Device not supported by the driver\n", __func__); |
|
return size; /* No device family */ |
|
} |
|
|
|
if (val == 0) /* val=0 : trigger a EEPROM save */ |
|
ret = copy_scratchpad(sl); |
|
else { |
|
if (SLAVE_SPECIFIC_FUNC(sl)->set_resolution) |
|
ret = SLAVE_SPECIFIC_FUNC(sl)->set_resolution(sl, val); |
|
} |
|
|
|
if (ret) { |
|
dev_warn(device, "%s: Set resolution - error %d\n", __func__, ret); |
|
/* Propagate error to userspace */ |
|
return ret; |
|
} |
|
SLAVE_RESOLUTION(sl) = val; |
|
/* Reset the conversion time to default - it depends on resolution */ |
|
SLAVE_CONV_TIME_OVERRIDE(sl) = CONV_TIME_DEFAULT; |
|
|
|
return size; /* always return size to avoid infinite calling */ |
|
} |
|
|
|
static ssize_t temperature_show(struct device *device, |
|
struct device_attribute *attr, char *buf) |
|
{ |
|
struct w1_slave *sl = dev_to_w1_slave(device); |
|
struct therm_info info; |
|
int ret = 0; |
|
|
|
if ((!sl->family_data) || (!SLAVE_SPECIFIC_FUNC(sl))) { |
|
dev_info(device, |
|
"%s: Device not supported by the driver\n", __func__); |
|
return 0; /* No device family */ |
|
} |
|
|
|
if (bulk_read_support(sl)) { |
|
if (SLAVE_CONVERT_TRIGGERED(sl) < 0) { |
|
dev_dbg(device, |
|
"%s: Conversion in progress, retry later\n", |
|
__func__); |
|
return 0; |
|
} else if (SLAVE_CONVERT_TRIGGERED(sl) > 0) { |
|
/* A bulk read has been issued, read the device RAM */ |
|
ret = read_scratchpad(sl, &info); |
|
SLAVE_CONVERT_TRIGGERED(sl) = 0; |
|
} else |
|
ret = convert_t(sl, &info); |
|
} else |
|
ret = convert_t(sl, &info); |
|
|
|
if (ret < 0) { |
|
dev_dbg(device, |
|
"%s: Temperature data may be corrupted. err=%d\n", |
|
__func__, ret); |
|
return 0; |
|
} |
|
|
|
return sprintf(buf, "%d\n", temperature_from_RAM(sl, info.rom)); |
|
} |
|
|
|
static ssize_t ext_power_show(struct device *device, |
|
struct device_attribute *attr, char *buf) |
|
{ |
|
struct w1_slave *sl = dev_to_w1_slave(device); |
|
|
|
if (!sl->family_data) { |
|
dev_info(device, |
|
"%s: Device not supported by the driver\n", __func__); |
|
return 0; /* No device family */ |
|
} |
|
|
|
/* Getting the power mode of the device {external, parasite} */ |
|
SLAVE_POWERMODE(sl) = read_powermode(sl); |
|
|
|
if (SLAVE_POWERMODE(sl) < 0) { |
|
dev_dbg(device, |
|
"%s: Power_mode may be corrupted. err=%d\n", |
|
__func__, SLAVE_POWERMODE(sl)); |
|
} |
|
return sprintf(buf, "%d\n", SLAVE_POWERMODE(sl)); |
|
} |
|
|
|
static ssize_t resolution_show(struct device *device, |
|
struct device_attribute *attr, char *buf) |
|
{ |
|
struct w1_slave *sl = dev_to_w1_slave(device); |
|
|
|
if ((!sl->family_data) || (!SLAVE_SPECIFIC_FUNC(sl))) { |
|
dev_info(device, |
|
"%s: Device not supported by the driver\n", __func__); |
|
return 0; /* No device family */ |
|
} |
|
|
|
/* get the correct function depending on the device */ |
|
SLAVE_RESOLUTION(sl) = SLAVE_SPECIFIC_FUNC(sl)->get_resolution(sl); |
|
if (SLAVE_RESOLUTION(sl) < 0) { |
|
dev_dbg(device, |
|
"%s: Resolution may be corrupted. err=%d\n", |
|
__func__, SLAVE_RESOLUTION(sl)); |
|
} |
|
|
|
return sprintf(buf, "%d\n", SLAVE_RESOLUTION(sl)); |
|
} |
|
|
|
static ssize_t resolution_store(struct device *device, |
|
struct device_attribute *attr, const char *buf, size_t size) |
|
{ |
|
struct w1_slave *sl = dev_to_w1_slave(device); |
|
int val; |
|
int ret = 0; |
|
|
|
ret = kstrtoint(buf, 10, &val); /* converting user entry to int */ |
|
|
|
if (ret) { /* conversion error */ |
|
dev_info(device, |
|
"%s: conversion error. err= %d\n", __func__, ret); |
|
return size; /* return size to avoid call back again */ |
|
} |
|
|
|
if ((!sl->family_data) || (!SLAVE_SPECIFIC_FUNC(sl))) { |
|
dev_info(device, |
|
"%s: Device not supported by the driver\n", __func__); |
|
return size; /* No device family */ |
|
} |
|
|
|
/* |
|
* Don't deal with the val enterd by user, |
|
* only device knows what is correct or not |
|
*/ |
|
|
|
/* get the correct function depending on the device */ |
|
ret = SLAVE_SPECIFIC_FUNC(sl)->set_resolution(sl, val); |
|
|
|
if (ret) |
|
return ret; |
|
|
|
SLAVE_RESOLUTION(sl) = val; |
|
/* Reset the conversion time to default because it depends on resolution */ |
|
SLAVE_CONV_TIME_OVERRIDE(sl) = CONV_TIME_DEFAULT; |
|
|
|
return size; |
|
} |
|
|
|
static ssize_t eeprom_cmd_store(struct device *device, |
|
struct device_attribute *attr, const char *buf, size_t size) |
|
{ |
|
struct w1_slave *sl = dev_to_w1_slave(device); |
|
int ret = -EINVAL; /* Invalid argument */ |
|
|
|
if (size == sizeof(EEPROM_CMD_WRITE)) { |
|
if (!strncmp(buf, EEPROM_CMD_WRITE, sizeof(EEPROM_CMD_WRITE)-1)) |
|
ret = copy_scratchpad(sl); |
|
} else if (size == sizeof(EEPROM_CMD_READ)) { |
|
if (!strncmp(buf, EEPROM_CMD_READ, sizeof(EEPROM_CMD_READ)-1)) |
|
ret = recall_eeprom(sl); |
|
} |
|
|
|
if (ret) |
|
dev_info(device, "%s: error in process %d\n", __func__, ret); |
|
|
|
return size; |
|
} |
|
|
|
static ssize_t alarms_show(struct device *device, |
|
struct device_attribute *attr, char *buf) |
|
{ |
|
struct w1_slave *sl = dev_to_w1_slave(device); |
|
int ret; |
|
s8 th = 0, tl = 0; |
|
struct therm_info scratchpad; |
|
|
|
ret = read_scratchpad(sl, &scratchpad); |
|
|
|
if (!ret) { |
|
th = scratchpad.rom[2]; /* TH is byte 2 */ |
|
tl = scratchpad.rom[3]; /* TL is byte 3 */ |
|
} else { |
|
dev_info(device, |
|
"%s: error reading alarms register %d\n", |
|
__func__, ret); |
|
} |
|
|
|
return sprintf(buf, "%hd %hd\n", tl, th); |
|
} |
|
|
|
static ssize_t alarms_store(struct device *device, |
|
struct device_attribute *attr, const char *buf, size_t size) |
|
{ |
|
struct w1_slave *sl = dev_to_w1_slave(device); |
|
struct therm_info info; |
|
u8 new_config_register[3]; /* array of data to be written */ |
|
int temp, ret; |
|
char *token = NULL; |
|
s8 tl, th, tt; /* 1 byte per value + temp ring order */ |
|
char *p_args, *orig; |
|
|
|
p_args = orig = kmalloc(size, GFP_KERNEL); |
|
/* Safe string copys as buf is const */ |
|
if (!p_args) { |
|
dev_warn(device, |
|
"%s: error unable to allocate memory %d\n", |
|
__func__, -ENOMEM); |
|
return size; |
|
} |
|
strcpy(p_args, buf); |
|
|
|
/* Split string using space char */ |
|
token = strsep(&p_args, " "); |
|
|
|
if (!token) { |
|
dev_info(device, |
|
"%s: error parsing args %d\n", __func__, -EINVAL); |
|
goto free_m; |
|
} |
|
|
|
/* Convert 1st entry to int */ |
|
ret = kstrtoint (token, 10, &temp); |
|
if (ret) { |
|
dev_info(device, |
|
"%s: error parsing args %d\n", __func__, ret); |
|
goto free_m; |
|
} |
|
|
|
tl = int_to_short(temp); |
|
|
|
/* Split string using space char */ |
|
token = strsep(&p_args, " "); |
|
if (!token) { |
|
dev_info(device, |
|
"%s: error parsing args %d\n", __func__, -EINVAL); |
|
goto free_m; |
|
} |
|
/* Convert 2nd entry to int */ |
|
ret = kstrtoint (token, 10, &temp); |
|
if (ret) { |
|
dev_info(device, |
|
"%s: error parsing args %d\n", __func__, ret); |
|
goto free_m; |
|
} |
|
|
|
/* Prepare to cast to short by eliminating out of range values */ |
|
th = int_to_short(temp); |
|
|
|
/* Reorder if required th and tl */ |
|
if (tl > th) { |
|
tt = tl; tl = th; th = tt; |
|
} |
|
|
|
/* |
|
* Read the scratchpad to change only the required bits |
|
* (th : byte 2 - tl: byte 3) |
|
*/ |
|
ret = read_scratchpad(sl, &info); |
|
if (!ret) { |
|
new_config_register[0] = th; /* Byte 2 */ |
|
new_config_register[1] = tl; /* Byte 3 */ |
|
new_config_register[2] = info.rom[4];/* Byte 4 */ |
|
} else { |
|
dev_info(device, |
|
"%s: error reading from the slave device %d\n", |
|
__func__, ret); |
|
goto free_m; |
|
} |
|
|
|
/* Write data in the device RAM */ |
|
if (!SLAVE_SPECIFIC_FUNC(sl)) { |
|
dev_info(device, |
|
"%s: Device not supported by the driver %d\n", |
|
__func__, -ENODEV); |
|
goto free_m; |
|
} |
|
|
|
ret = SLAVE_SPECIFIC_FUNC(sl)->write_data(sl, new_config_register); |
|
if (ret) |
|
dev_info(device, |
|
"%s: error writing to the slave device %d\n", |
|
__func__, ret); |
|
|
|
free_m: |
|
/* free allocated memory */ |
|
kfree(orig); |
|
|
|
return size; |
|
} |
|
|
|
static ssize_t therm_bulk_read_store(struct device *device, |
|
struct device_attribute *attr, const char *buf, size_t size) |
|
{ |
|
struct w1_master *dev_master = dev_to_w1_master(device); |
|
int ret = -EINVAL; /* Invalid argument */ |
|
|
|
if (size == sizeof(BULK_TRIGGER_CMD)) |
|
if (!strncmp(buf, BULK_TRIGGER_CMD, |
|
sizeof(BULK_TRIGGER_CMD)-1)) |
|
ret = trigger_bulk_read(dev_master); |
|
|
|
if (ret) |
|
dev_info(device, |
|
"%s: unable to trigger a bulk read on the bus. err=%d\n", |
|
__func__, ret); |
|
|
|
return size; |
|
} |
|
|
|
static ssize_t therm_bulk_read_show(struct device *device, |
|
struct device_attribute *attr, char *buf) |
|
{ |
|
struct w1_master *dev_master = dev_to_w1_master(device); |
|
struct w1_slave *sl = NULL; |
|
int ret = 0; |
|
|
|
list_for_each_entry(sl, &dev_master->slist, w1_slave_entry) { |
|
if (sl->family_data) { |
|
if (bulk_read_support(sl)) { |
|
if (SLAVE_CONVERT_TRIGGERED(sl) == -1) { |
|
ret = -1; |
|
goto show_result; |
|
} |
|
if (SLAVE_CONVERT_TRIGGERED(sl) == 1) |
|
/* continue to check other slaves */ |
|
ret = 1; |
|
} |
|
} |
|
} |
|
show_result: |
|
return sprintf(buf, "%d\n", ret); |
|
} |
|
|
|
static ssize_t conv_time_show(struct device *device, |
|
struct device_attribute *attr, char *buf) |
|
{ |
|
struct w1_slave *sl = dev_to_w1_slave(device); |
|
|
|
if ((!sl->family_data) || (!SLAVE_SPECIFIC_FUNC(sl))) { |
|
dev_info(device, |
|
"%s: Device is not supported by the driver\n", __func__); |
|
return 0; /* No device family */ |
|
} |
|
return sprintf(buf, "%d\n", conversion_time(sl)); |
|
} |
|
|
|
static ssize_t conv_time_store(struct device *device, |
|
struct device_attribute *attr, const char *buf, size_t size) |
|
{ |
|
int val, ret = 0; |
|
struct w1_slave *sl = dev_to_w1_slave(device); |
|
|
|
if (kstrtoint(buf, 10, &val)) /* converting user entry to int */ |
|
return -EINVAL; |
|
|
|
if (check_family_data(sl)) |
|
return -ENODEV; |
|
|
|
if (val != CONV_TIME_MEASURE) { |
|
if (val >= CONV_TIME_DEFAULT) |
|
SLAVE_CONV_TIME_OVERRIDE(sl) = val; |
|
else |
|
return -EINVAL; |
|
|
|
} else { |
|
int conv_time; |
|
|
|
ret = conv_time_measure(sl, &conv_time); |
|
if (ret) |
|
return -EIO; |
|
SLAVE_CONV_TIME_OVERRIDE(sl) = conv_time; |
|
} |
|
return size; |
|
} |
|
|
|
static ssize_t features_show(struct device *device, |
|
struct device_attribute *attr, char *buf) |
|
{ |
|
struct w1_slave *sl = dev_to_w1_slave(device); |
|
|
|
if ((!sl->family_data) || (!SLAVE_SPECIFIC_FUNC(sl))) { |
|
dev_info(device, |
|
"%s: Device not supported by the driver\n", __func__); |
|
return 0; /* No device family */ |
|
} |
|
return sprintf(buf, "%u\n", SLAVE_FEATURES(sl)); |
|
} |
|
|
|
static ssize_t features_store(struct device *device, |
|
struct device_attribute *attr, const char *buf, size_t size) |
|
{ |
|
int val, ret = 0; |
|
bool strong_pullup; |
|
struct w1_slave *sl = dev_to_w1_slave(device); |
|
|
|
ret = kstrtouint(buf, 10, &val); /* converting user entry to int */ |
|
if (ret) |
|
return -EINVAL; /* invalid number */ |
|
|
|
if ((!sl->family_data) || (!SLAVE_SPECIFIC_FUNC(sl))) { |
|
dev_info(device, "%s: Device not supported by the driver\n", __func__); |
|
return -ENODEV; |
|
} |
|
|
|
if ((val & W1_THERM_FEATURES_MASK) != val) |
|
return -EINVAL; |
|
|
|
SLAVE_FEATURES(sl) = val; |
|
|
|
strong_pullup = (w1_strong_pullup == 2 || |
|
(!SLAVE_POWERMODE(sl) && |
|
w1_strong_pullup)); |
|
|
|
if (strong_pullup && SLAVE_FEATURES(sl) & W1_THERM_POLL_COMPLETION) { |
|
dev_warn(&sl->dev, |
|
"%s: W1_THERM_POLL_COMPLETION disabled in parasite power mode.\n", |
|
__func__); |
|
SLAVE_FEATURES(sl) &= ~W1_THERM_POLL_COMPLETION; |
|
} |
|
|
|
return size; |
|
} |
|
|
|
#if IS_REACHABLE(CONFIG_HWMON) |
|
static int w1_read_temp(struct device *device, u32 attr, int channel, |
|
long *val) |
|
{ |
|
struct w1_slave *sl = dev_get_drvdata(device); |
|
struct therm_info info; |
|
int ret; |
|
|
|
switch (attr) { |
|
case hwmon_temp_input: |
|
ret = convert_t(sl, &info); |
|
if (ret) |
|
return ret; |
|
|
|
if (!info.verdict) { |
|
ret = -EIO; |
|
return ret; |
|
} |
|
|
|
*val = temperature_from_RAM(sl, info.rom); |
|
ret = 0; |
|
break; |
|
default: |
|
ret = -EOPNOTSUPP; |
|
break; |
|
} |
|
|
|
return ret; |
|
} |
|
#endif |
|
|
|
#define W1_42_CHAIN 0x99 |
|
#define W1_42_CHAIN_OFF 0x3C |
|
#define W1_42_CHAIN_OFF_INV 0xC3 |
|
#define W1_42_CHAIN_ON 0x5A |
|
#define W1_42_CHAIN_ON_INV 0xA5 |
|
#define W1_42_CHAIN_DONE 0x96 |
|
#define W1_42_CHAIN_DONE_INV 0x69 |
|
#define W1_42_COND_READ 0x0F |
|
#define W1_42_SUCCESS_CONFIRM_BYTE 0xAA |
|
#define W1_42_FINISHED_BYTE 0xFF |
|
static ssize_t w1_seq_show(struct device *device, |
|
struct device_attribute *attr, char *buf) |
|
{ |
|
struct w1_slave *sl = dev_to_w1_slave(device); |
|
ssize_t c = PAGE_SIZE; |
|
int rv; |
|
int i; |
|
u8 ack; |
|
u64 rn; |
|
struct w1_reg_num *reg_num; |
|
int seq = 0; |
|
|
|
mutex_lock(&sl->master->bus_mutex); |
|
/* Place all devices in CHAIN state */ |
|
if (w1_reset_bus(sl->master)) |
|
goto error; |
|
w1_write_8(sl->master, W1_SKIP_ROM); |
|
w1_write_8(sl->master, W1_42_CHAIN); |
|
w1_write_8(sl->master, W1_42_CHAIN_ON); |
|
w1_write_8(sl->master, W1_42_CHAIN_ON_INV); |
|
msleep(sl->master->pullup_duration); |
|
|
|
/* check for acknowledgment */ |
|
ack = w1_read_8(sl->master); |
|
if (ack != W1_42_SUCCESS_CONFIRM_BYTE) |
|
goto error; |
|
|
|
/* In case the bus fails to send 0xFF, limit */ |
|
for (i = 0; i <= 64; i++) { |
|
if (w1_reset_bus(sl->master)) |
|
goto error; |
|
|
|
w1_write_8(sl->master, W1_42_COND_READ); |
|
rv = w1_read_block(sl->master, (u8 *)&rn, 8); |
|
reg_num = (struct w1_reg_num *) &rn; |
|
if (reg_num->family == W1_42_FINISHED_BYTE) |
|
break; |
|
if (sl->reg_num.id == reg_num->id) |
|
seq = i; |
|
|
|
w1_write_8(sl->master, W1_42_CHAIN); |
|
w1_write_8(sl->master, W1_42_CHAIN_DONE); |
|
w1_write_8(sl->master, W1_42_CHAIN_DONE_INV); |
|
w1_read_block(sl->master, &ack, sizeof(ack)); |
|
|
|
/* check for acknowledgment */ |
|
ack = w1_read_8(sl->master); |
|
if (ack != W1_42_SUCCESS_CONFIRM_BYTE) |
|
goto error; |
|
|
|
} |
|
|
|
/* Exit from CHAIN state */ |
|
if (w1_reset_bus(sl->master)) |
|
goto error; |
|
w1_write_8(sl->master, W1_SKIP_ROM); |
|
w1_write_8(sl->master, W1_42_CHAIN); |
|
w1_write_8(sl->master, W1_42_CHAIN_OFF); |
|
w1_write_8(sl->master, W1_42_CHAIN_OFF_INV); |
|
|
|
/* check for acknowledgment */ |
|
ack = w1_read_8(sl->master); |
|
if (ack != W1_42_SUCCESS_CONFIRM_BYTE) |
|
goto error; |
|
mutex_unlock(&sl->master->bus_mutex); |
|
|
|
c -= snprintf(buf + PAGE_SIZE - c, c, "%d\n", seq); |
|
return PAGE_SIZE - c; |
|
error: |
|
mutex_unlock(&sl->master->bus_mutex); |
|
return -EIO; |
|
} |
|
|
|
static int __init w1_therm_init(void) |
|
{ |
|
int err, i; |
|
|
|
for (i = 0; i < ARRAY_SIZE(w1_therm_families); ++i) { |
|
err = w1_register_family(w1_therm_families[i].f); |
|
if (err) |
|
w1_therm_families[i].broken = 1; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static void __exit w1_therm_fini(void) |
|
{ |
|
int i; |
|
|
|
for (i = 0; i < ARRAY_SIZE(w1_therm_families); ++i) |
|
if (!w1_therm_families[i].broken) |
|
w1_unregister_family(w1_therm_families[i].f); |
|
} |
|
|
|
module_init(w1_therm_init); |
|
module_exit(w1_therm_fini); |
|
|
|
MODULE_AUTHOR("Evgeniy Polyakov <[email protected]>"); |
|
MODULE_DESCRIPTION("Driver for 1-wire Dallas network protocol, temperature family."); |
|
MODULE_LICENSE("GPL"); |
|
MODULE_ALIAS("w1-family-" __stringify(W1_THERM_DS18S20)); |
|
MODULE_ALIAS("w1-family-" __stringify(W1_THERM_DS1822)); |
|
MODULE_ALIAS("w1-family-" __stringify(W1_THERM_DS18B20)); |
|
MODULE_ALIAS("w1-family-" __stringify(W1_THERM_DS1825)); |
|
MODULE_ALIAS("w1-family-" __stringify(W1_THERM_DS28EA00));
|
|
|