diff options
Diffstat (limited to 'drivers/w1/slaves/w1_therm.c')
| -rw-r--r-- | drivers/w1/slaves/w1_therm.c | 1624 |
1 files changed, 1343 insertions, 281 deletions
diff --git a/drivers/w1/slaves/w1_therm.c b/drivers/w1/slaves/w1_therm.c index e028e0092799..c1b4eda16719 100644 --- a/drivers/w1/slaves/w1_therm.c +++ b/drivers/w1/slaves/w1_therm.c @@ -16,6 +16,7 @@ #include <linux/slab.h> #include <linux/delay.h> #include <linux/hwmon.h> +#include <linux/string.h> #include <linux/w1.h> @@ -25,7 +26,8 @@ #define W1_THERM_DS1825 0x3B #define W1_THERM_DS28EA00 0x42 -/* Allow the strong pullup to be disabled, but default to enabled. +/* + * Allow the strong pullup to be disabled, but default to enabled. * If it was disabled a parasite powered device might not get the require * current to do a temperature conversion. If it is enabled parasite powered * devices have a better chance of getting the current required. @@ -41,42 +43,211 @@ static int w1_strong_pullup = 1; module_param_named(strong_pullup, w1_strong_pullup, int, 0); +/* Counter for devices supporting bulk reading */ +static u16 bulk_read_device_counter; /* =0 as per C standard */ + +/* This command should be in public header w1.h but is not */ +#define W1_RECALL_EEPROM 0xB8 + +/* Nb of try for an operation */ +#define W1_THERM_MAX_TRY 5 + +/* ms delay to retry bus mutex */ +#define W1_THERM_RETRY_DELAY 20 + +/* delay in ms to write in EEPROM */ +#define W1_THERM_EEPROM_WRITE_DELAY 10 + +#define EEPROM_CMD_WRITE "save" /* cmd for write eeprom sysfs */ +#define EEPROM_CMD_READ "restore" /* cmd for read eeprom sysfs */ +#define BULK_TRIGGER_CMD "trigger" /* cmd to trigger a bulk read */ + +#define MIN_TEMP -55 /* min temperature that can be mesured */ +#define MAX_TEMP 125 /* max temperature that can be mesured */ + +/* Helpers Macros */ + +/* + * return a pointer on the slave w1_therm_family_converter struct: + * always test family data existence before using this macro + */ +#define SLAVE_SPECIFIC_FUNC(sl) \ + (((struct w1_therm_family_data *)(sl->family_data))->specific_functions) + +/* + * return the power mode of the sl slave : 1-ext, 0-parasite, <0 unknown + * always test family data existence before using this macro + */ +#define SLAVE_POWERMODE(sl) \ + (((struct w1_therm_family_data *)(sl->family_data))->external_powered) + +/* + * return the resolution in bit of the sl slave : <0 unknown + * always test family data existence before using this macro + */ +#define SLAVE_RESOLUTION(sl) \ + (((struct w1_therm_family_data *)(sl->family_data))->resolution) + +/* + * return whether or not a converT command has been issued to the slave + * * 0: no bulk read is pending + * * -1: conversion is in progress + * * 1: conversion done, result to be read + */ +#define SLAVE_CONVERT_TRIGGERED(sl) \ + (((struct w1_therm_family_data *)(sl->family_data))->convert_triggered) + +/* return the address of the refcnt in the family data */ +#define THERM_REFCNT(family_data) \ + (&((struct w1_therm_family_data *)family_data)->refcnt) + +/* Structs definition */ + +/** + * struct w1_therm_family_converter - bind device specific functions + * @broken: flag for non-registred families + * @reserved: not used here + * @f: pointer to the device binding structure + * @convert: pointer to the device conversion function + * @get_conversion_time: pointer to the device conversion time function + * @set_resolution: pointer to the device set_resolution function + * @get_resolution: pointer to the device get_resolution function + * @write_data: pointer to the device writing function (2 or 3 bytes) + * @bulk_read: true if device family support bulk read, false otherwise + */ +struct w1_therm_family_converter { + u8 broken; + u16 reserved; + struct w1_family *f; + int (*convert)(u8 rom[9]); + int (*get_conversion_time)(struct w1_slave *sl); + int (*set_resolution)(struct w1_slave *sl, int val); + int (*get_resolution)(struct w1_slave *sl); + int (*write_data)(struct w1_slave *sl, const u8 *data); + bool bulk_read; +}; + +/** + * struct w1_therm_family_data - device data + * @rom: ROM device id (64bit Lasered ROM code + 1 CRC byte) + * @refcnt: ref count + * @external_powered: 1 device powered externally, + * 0 device parasite powered, + * -x error or undefined + * @resolution: current device resolution + * @convert_triggered: conversion state of the device + * @specific_functions: pointer to struct of device specific function + */ struct w1_therm_family_data { uint8_t rom[9]; atomic_t refcnt; + int external_powered; + int resolution; + int convert_triggered; + struct w1_therm_family_converter *specific_functions; }; +/** + * struct therm_info - store temperature reading + * @rom: read device data (8 data bytes + 1 CRC byte) + * @crc: computed crc from rom + * @verdict: 1 crc checked, 0 crc not matching + */ struct therm_info { u8 rom[9]; u8 crc; u8 verdict; }; -/* return the address of the refcnt in the family data */ -#define THERM_REFCNT(family_data) \ - (&((struct w1_therm_family_data *)family_data)->refcnt) +/* Hardware Functions declaration */ -static int w1_therm_add_slave(struct w1_slave *sl) -{ - 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); - return 0; -} +/** + * reset_select_slave() - reset and select a slave + * @sl: the slave to select + * + * Resets the bus and select the slave by sending a ROM MATCH cmd + * w1_reset_select_slave() from w1_io.c could not be used here because + * it sent a SKIP ROM command if only one device is on the line. + * At the beginning of the such process, sl->master->slave_count is 1 even if + * more devices are on the line, causing collision on the line. + * + * Context: The w1 master lock must be held. + * + * Return: 0 if success, negative kernel error code otherwise. + */ +static int reset_select_slave(struct w1_slave *sl); -static void w1_therm_remove_slave(struct w1_slave *sl) -{ - int refcnt = atomic_sub_return(1, THERM_REFCNT(sl->family_data)); +/** + * convert_t() - Query the device for temperature conversion and read + * @sl: pointer to the slave to read + * @info: pointer to a structure to store the read results + * + * Return: 0 if success, -kernel error code otherwise + */ +static int convert_t(struct w1_slave *sl, struct therm_info *info); - while (refcnt) { - msleep(1000); - refcnt = atomic_read(THERM_REFCNT(sl->family_data)); - } - kfree(sl->family_data); - sl->family_data = NULL; -} +/** + * read_scratchpad() - read the data in device RAM + * @sl: pointer to the slave to read + * @info: pointer to a structure to store the read results + * + * Return: 0 if success, -kernel error code otherwise + */ +static int read_scratchpad(struct w1_slave *sl, struct therm_info *info); + +/** + * write_scratchpad() - write nb_bytes in the device RAM + * @sl: pointer to the slave to write in + * @data: pointer to an array of 3 bytes, as 3 bytes MUST be written + * @nb_bytes: number of bytes to be written (2 for DS18S20, 3 otherwise) + * + * Return: 0 if success, -kernel error code otherwise + */ +static int write_scratchpad(struct w1_slave *sl, const u8 *data, u8 nb_bytes); + +/** + * copy_scratchpad() - Copy the content of scratchpad in device EEPROM + * @sl: slave involved + * + * Return: 0 if success, -kernel error code otherwise + */ +static int copy_scratchpad(struct w1_slave *sl); + +/** + * recall_eeprom() - Restore EEPROM data to device RAM + * @sl: slave involved + * + * Return: 0 if success, -kernel error code otherwise + */ +static int recall_eeprom(struct w1_slave *sl); + +/** + * read_powermode() - Query the power mode of the slave + * @sl: slave to retrieve the power mode + * + * Ask the device to get its power mode (external or parasite) + * and store the power status in the &struct w1_therm_family_data. + * + * Return: + * * 0 parasite powered device + * * 1 externally powered device + * * <0 kernel error code + */ +static int read_powermode(struct w1_slave *sl); + +/** + * trigger_bulk_read() - function to trigger a bulk read on the bus + * @dev_master: the device master of the bus + * + * Send a SKIP ROM follow by a CONVERT T commmand on the bus. + * It also set the status flag in each slave &struct w1_therm_family_data + * to signal that a conversion is in progress. + * + * Return: 0 if success, -kernel error code otherwise + */ +static int trigger_bulk_read(struct w1_master *dev_master); + +/* Sysfs interface declaration */ static ssize_t w1_slave_show(struct device *device, struct device_attribute *attr, char *buf); @@ -87,21 +258,103 @@ static ssize_t w1_slave_store(struct device *device, static ssize_t w1_seq_show(struct device *device, struct device_attribute *attr, char *buf); +static ssize_t temperature_show(struct device *device, + struct device_attribute *attr, char *buf); + +static ssize_t ext_power_show(struct device *device, + struct device_attribute *attr, char *buf); + +static ssize_t resolution_show(struct device *device, + struct device_attribute *attr, char *buf); + +static ssize_t resolution_store(struct device *device, + struct device_attribute *attr, const char *buf, size_t size); + +static ssize_t eeprom_store(struct device *device, + struct device_attribute *attr, const char *buf, size_t size); + +static ssize_t alarms_store(struct device *device, + struct device_attribute *attr, const char *buf, size_t size); + +static ssize_t alarms_show(struct device *device, + struct device_attribute *attr, char *buf); + +static ssize_t therm_bulk_read_store(struct device *device, + struct device_attribute *attr, const char *buf, size_t size); + +static ssize_t therm_bulk_read_show(struct device *device, + struct device_attribute *attr, char *buf); + +/* Attributes declarations */ + static DEVICE_ATTR_RW(w1_slave); static DEVICE_ATTR_RO(w1_seq); +static DEVICE_ATTR_RO(temperature); +static DEVICE_ATTR_RO(ext_power); +static DEVICE_ATTR_RW(resolution); +static DEVICE_ATTR_WO(eeprom); +static DEVICE_ATTR_RW(alarms); + +static DEVICE_ATTR_RW(therm_bulk_read); /* attribut at master level */ + +/* Interface Functions declaration */ + +/** + * w1_therm_add_slave() - Called when a new slave is discovered + * @sl: slave just discovered by the master. + * + * Called by the master when the slave is discovered on the bus. Used to + * initialize slave state before the beginning of any communication. + * + * Return: 0 - If success, negative kernel code otherwise + */ +static int w1_therm_add_slave(struct w1_slave *sl); + +/** + * w1_therm_remove_slave() - Called when a slave is removed + * @sl: slave to be removed. + * + * Called by the master when the slave is considered not to be on the bus + * anymore. Used to free memory. + */ +static void w1_therm_remove_slave(struct w1_slave *sl); + +/* Family attributes */ static struct attribute *w1_therm_attrs[] = { &dev_attr_w1_slave.attr, + &dev_attr_temperature.attr, + &dev_attr_ext_power.attr, + &dev_attr_resolution.attr, + &dev_attr_eeprom.attr, + &dev_attr_alarms.attr, + NULL, +}; + +static struct attribute *w1_ds18s20_attrs[] = { + &dev_attr_w1_slave.attr, + &dev_attr_temperature.attr, + &dev_attr_ext_power.attr, + &dev_attr_eeprom.attr, + &dev_attr_alarms.attr, NULL, }; static struct attribute *w1_ds28ea00_attrs[] = { &dev_attr_w1_slave.attr, &dev_attr_w1_seq.attr, + &dev_attr_temperature.attr, + &dev_attr_ext_power.attr, + &dev_attr_resolution.attr, + &dev_attr_eeprom.attr, + &dev_attr_alarms.attr, NULL, }; +/* Attribute groups */ + ATTRIBUTE_GROUPS(w1_therm); +ATTRIBUTE_GROUPS(w1_ds18s20); ATTRIBUTE_GROUPS(w1_ds28ea00); #if IS_REACHABLE(CONFIG_HWMON) @@ -154,6 +407,8 @@ static const struct hwmon_chip_info w1_chip_info = { #define W1_CHIPINFO NULL #endif +/* Family operations */ + static struct w1_family_ops w1_therm_fops = { .add_slave = w1_therm_add_slave, .remove_slave = w1_therm_remove_slave, @@ -161,6 +416,13 @@ static struct w1_family_ops w1_therm_fops = { .chip_info = W1_CHIPINFO, }; +static struct w1_family_ops w1_ds18s20_fops = { + .add_slave = w1_therm_add_slave, + .remove_slave = w1_therm_remove_slave, + .groups = w1_ds18s20_groups, + .chip_info = W1_CHIPINFO, +}; + static struct w1_family_ops w1_ds28ea00_fops = { .add_slave = w1_therm_add_slave, .remove_slave = w1_therm_remove_slave, @@ -168,9 +430,11 @@ static struct w1_family_ops w1_ds28ea00_fops = { .chip_info = W1_CHIPINFO, }; +/* Family binding operations struct */ + static struct w1_family w1_therm_family_DS18S20 = { .fid = W1_THERM_DS18S20, - .fops = &w1_therm_fops, + .fops = &w1_ds18s20_fops, }; static struct w1_family w1_therm_family_DS18B20 = { @@ -193,377 +457,813 @@ static struct w1_family w1_therm_family_DS1825 = { .fops = &w1_therm_fops, }; -struct w1_therm_family_converter { - u8 broken; - u16 reserved; - struct w1_family *f; - int (*convert)(u8 rom[9]); - int (*precision)(struct device *device, int val); - int (*eeprom)(struct device *device); -}; +/* Device dependent func */ + +static inline int w1_DS18B20_convert_time(struct w1_slave *sl) +{ + int ret; + + if (!sl->family_data) + return -ENODEV; /* device unknown */ + + /* return time in ms for conversion operation */ + switch (SLAVE_RESOLUTION(sl)) { + case 9: + ret = 95; + break; + case 10: + ret = 190; + break; + case 11: + ret = 375; + break; + case 12: + default: + ret = 750; + } + return ret; +} + +static inline int w1_DS18S20_convert_time(struct w1_slave *sl) +{ + (void)(sl); + return 750; /* always 750ms for DS18S20 */ +} + +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; + u8 new_config_register[3]; /* array of data to be written */ + struct therm_info info; + + /* resolution of DS18B20 is in the range [9..12] bits */ + if (val < 9 || val > 12) + return -EINVAL; + + val -= 9; /* soustract 9 the lowest resolution in bit */ + val = (val << 5); /* shift to position bit 5 & bit 6 */ + + /* + * Read the scratchpad to change only the required bits + * (bit5 & bit 6 from byte 4) + */ + ret = read_scratchpad(sl, &info); + if (!ret) { + new_config_register[0] = info.rom[2]; + new_config_register[1] = info.rom[3]; + /* config register is byte 4 & mask 0b10011111*/ + new_config_register[2] = (info.rom[4] & 0x9F) | + (u8) val; + } else + return ret; + + /* Write data in the device RAM */ + ret = w1_DS18B20_write_data(sl, new_config_register); + + return ret; +} + +static inline int w1_DS18B20_get_resolution(struct w1_slave *sl) +{ + int ret; + u8 config_register; + struct therm_info info; + + ret = read_scratchpad(sl, &info); + + if (!ret) { + config_register = info.rom[4]; /* config register is byte 4 */ + config_register &= 0x60; /* 0b01100000 keep only bit 5 & 6 */ + config_register = (config_register >> 5); /* shift */ + config_register += 9; /* add 9 the lowest resolution in bit */ + ret = (int) config_register; + } + return ret; +} -/* write configuration to eeprom */ -static inline int w1_therm_eeprom(struct device *device); +/** + * 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]) +{ + s16 t = le16_to_cpup((__le16 *)rom); -/* Set precision for conversion */ -static inline int w1_DS18B20_precision(struct device *device, int val); -static inline int w1_DS18S20_precision(struct device *device, int val); + return t*1000/16; +} -/* The return value is millidegrees Centigrade. */ -static inline int w1_DS18B20_convert_temp(u8 rom[9]); -static inline int w1_DS18S20_convert_temp(u8 rom[9]); +/** + * 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 */ static struct w1_therm_family_converter w1_therm_families[] = { { - .f = &w1_therm_family_DS18S20, - .convert = w1_DS18S20_convert_temp, - .precision = w1_DS18S20_precision, - .eeprom = w1_therm_eeprom + .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, - .precision = w1_DS18S20_precision, - .eeprom = w1_therm_eeprom + .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 }, { - .f = &w1_therm_family_DS18B20, - .convert = w1_DS18B20_convert_temp, - .precision = w1_DS18B20_precision, - .eeprom = w1_therm_eeprom + .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, - .precision = w1_DS18S20_precision, - .eeprom = w1_therm_eeprom + .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, - .precision = w1_DS18S20_precision, - .eeprom = w1_therm_eeprom + .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 } }; -static inline int w1_therm_eeprom(struct device *device) +/* 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_slave *sl = dev_to_w1_slave(device); - struct w1_master *dev = sl->master; - u8 rom[9], external_power; - int ret, max_trying = 10; - u8 *family_data = sl->family_data; + struct w1_therm_family_converter *ret = NULL; + int i; - if (!sl->family_data) { - ret = -ENODEV; - goto error; + 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; +} - /* prevent the slave from going away in sleep */ - atomic_inc(THERM_REFCNT(family_data)); +/** + * 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; - ret = mutex_lock_interruptible(&dev->bus_mutex); - if (ret != 0) - goto dec_refcnt; + /* 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; - memset(rom, 0, sizeof(rom)); + sleep_rem = msleep_interruptible(W1_THERM_RETRY_DELAY); + if (!sleep_rem) + max_trying--; + } - while (max_trying--) { - if (!w1_reset_select_slave(sl)) { - unsigned int tm = 10; - unsigned long sleep_rem; + if (!max_trying) + return false; /* Didn't acquire the bus mutex */ + + return true; +} - /* check if in parasite mode */ - w1_write_8(dev, W1_READ_PSUPPLY); - external_power = w1_read_8(dev); +/** + * 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); - if (w1_reset_select_slave(sl)) - continue; + dev_info(&sl->dev, + "%s: Device not supported by the driver\n", __func__); - /* 10ms strong pullup/delay after the copy command */ - if (w1_strong_pullup == 2 || - (!external_power && w1_strong_pullup)) - w1_next_pullup(dev, tm); + 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; +} - w1_write_8(dev, W1_COPY_SCRATCHPAD); +/* Interface Functions */ - if (external_power) { - mutex_unlock(&dev->bus_mutex); +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; +} + +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; - sleep_rem = msleep_interruptible(tm); + if (!sl->family_data) + goto error; + + strong_pullup = (w1_strong_pullup == 2 || + (!SLAVE_POWERMODE(sl) && + w1_strong_pullup)); + + /* 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 dec_refcnt; + goto mt_unlock; } + mutex_unlock(&dev_master->bus_mutex); + } else { /*no device need pullup */ + mutex_unlock(&dev_master->bus_mutex); - ret = mutex_lock_interruptible(&dev->bus_mutex); - if (ret != 0) - goto dec_refcnt; - } else if (!w1_strong_pullup) { - sleep_rem = msleep_interruptible(tm); + sleep_rem = msleep_interruptible(t_conv); if (sleep_rem != 0) { ret = -EINTR; - goto mt_unlock; + goto dec_refcnt; } } - - break; + ret = read_scratchpad(sl, info); + goto dec_refcnt; } + } mt_unlock: - mutex_unlock(&dev->bus_mutex); + mutex_unlock(&dev_master->bus_mutex); dec_refcnt: - atomic_dec(THERM_REFCNT(family_data)); + atomic_dec(THERM_REFCNT(sl->family_data)); error: return ret; } -/* DS18S20 does not feature configuration register */ -static inline int w1_DS18S20_precision(struct device *device, int val) +static int read_scratchpad(struct w1_slave *sl, struct therm_info *info) { - return 0; -} + struct w1_master *dev_master = sl->master; + int max_trying = W1_THERM_MAX_TRY; + int ret = -ENODEV; -static inline int w1_DS18B20_precision(struct device *device, int val) -{ - struct w1_slave *sl = dev_to_w1_slave(device); - struct w1_master *dev = sl->master; - u8 rom[9], crc; - int ret, max_trying = 10; - u8 *family_data = sl->family_data; - uint8_t precision_bits; - uint8_t mask = 0x60; + info->verdict = 0; - if (val > 12 || val < 9) { - pr_warn("Unsupported precision\n"); - ret = -EINVAL; + if (!sl->family_data) goto error; - } - if (!sl->family_data) { - ret = -ENODEV; - goto error; - } + memset(info->rom, 0, sizeof(info->rom)); /* prevent the slave from going away in sleep */ - atomic_inc(THERM_REFCNT(family_data)); + atomic_inc(THERM_REFCNT(sl->family_data)); - ret = mutex_lock_interruptible(&dev->bus_mutex); - if (ret != 0) + if (!bus_mutex_lock(&dev_master->bus_mutex)) { + ret = -EAGAIN; /* Didn't acquire the mutex */ goto dec_refcnt; + } - memset(rom, 0, sizeof(rom)); + 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 */ + } - /* translate precision to bitmask (see datasheet page 9) */ - switch (val) { - case 9: - precision_bits = 0x00; - break; - case 10: - precision_bits = 0x20; - break; - case 11: - precision_bits = 0x40; - break; - case 12: - default: - precision_bits = 0x60; - break; } + mutex_unlock(&dev_master->bus_mutex); - while (max_trying--) { - crc = 0; +dec_refcnt: + atomic_dec(THERM_REFCNT(sl->family_data)); +error: + return ret; +} - if (!w1_reset_select_slave(sl)) { - int count = 0; +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; - /* read values to only alter precision bits */ - w1_write_8(dev, W1_READ_SCRATCHPAD); - count = w1_read_block(dev, rom, 9); - if (count != 9) - dev_warn(device, "w1_read_block() returned %u instead of 9.\n", count); + if (!sl->family_data) + goto error; - crc = w1_calc_crc8(rom, 8); - if (rom[8] == crc) { - rom[4] = (rom[4] & ~mask) | (precision_bits & mask); + /* prevent the slave from going away in sleep */ + atomic_inc(THERM_REFCNT(sl->family_data)); - if (!w1_reset_select_slave(sl)) { - w1_write_8(dev, W1_WRITE_SCRATCHPAD); - w1_write_8(dev, rom[2]); - w1_write_8(dev, rom[3]); - w1_write_8(dev, rom[4]); + if (!bus_mutex_lock(&dev_master->bus_mutex)) { + ret = -EAGAIN; /* Didn't acquire the mutex */ + goto dec_refcnt; + } - break; - } - } + 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); - mutex_unlock(&dev->bus_mutex); dec_refcnt: - atomic_dec(THERM_REFCNT(family_data)); + atomic_dec(THERM_REFCNT(sl->family_data)); error: return ret; } -static inline int w1_DS18B20_convert_temp(u8 rom[9]) +static int copy_scratchpad(struct w1_slave *sl) { - s16 t = le16_to_cpup((__le16 *)rom); + struct w1_master *dev_master = sl->master; + int max_trying = W1_THERM_MAX_TRY; + int t_write, ret = -ENODEV; + bool strong_pullup; - return t*1000/16; -} + if (!sl->family_data) + goto error; -static inline int w1_DS18S20_convert_temp(u8 rom[9]) -{ - int t, h; + t_write = W1_THERM_EEPROM_WRITE_DELAY; + strong_pullup = (w1_strong_pullup == 2 || + (!SLAVE_POWERMODE(sl) && + w1_strong_pullup)); - if (!rom[7]) - return 0; + /* prevent the slave from going away in sleep */ + atomic_inc(THERM_REFCNT(sl->family_data)); - if (rom[1] == 0) - t = ((s32)rom[0] >> 1)*1000; - else - t = 1000*(-1*(s32)(0x100-rom[0]) >> 1); + if (!bus_mutex_lock(&dev_master->bus_mutex)) { + ret = -EAGAIN; /* Didn't acquire the mutex */ + goto dec_refcnt; + } - t -= 250; - h = 1000*((s32)rom[7] - (s32)rom[6]); - h /= (s32)rom[7]; - t += h; + while (max_trying-- && ret) { /* ret should be 0 */ + /* safe version to select slave */ + if (!reset_select_slave(sl)) { + unsigned long sleep_rem; - return t; -} + /* 10ms strong pullup (or delay) after the convert */ + if (strong_pullup) + w1_next_pullup(dev_master, t_write); -static inline int w1_convert_temp(u8 rom[9], u8 fid) -{ - int i; + w1_write_8(dev_master, W1_COPY_SCRATCHPAD); - for (i = 0; i < ARRAY_SIZE(w1_therm_families); ++i) - if (w1_therm_families[i].f->fid == fid) - return w1_therm_families[i].convert(rom); + if (strong_pullup) { + sleep_rem = msleep_interruptible(t_write); + if (sleep_rem != 0) { + ret = -EINTR; + goto mt_unlock; + } + } + ret = 0; + } - return 0; + } + +mt_unlock: + mutex_unlock(&dev_master->bus_mutex); +dec_refcnt: + atomic_dec(THERM_REFCNT(sl->family_data)); +error: + return ret; } -static ssize_t w1_slave_store(struct device *device, - struct device_attribute *attr, const char *buf, - size_t size) +static int recall_eeprom(struct w1_slave *sl) { - int val, ret; - struct w1_slave *sl = dev_to_w1_slave(device); - int i; + struct w1_master *dev_master = sl->master; + int max_trying = W1_THERM_MAX_TRY; + int ret = -ENODEV; - ret = kstrtoint(buf, 0, &val); - if (ret) - return ret; + if (!sl->family_data) + goto error; - for (i = 0; i < ARRAY_SIZE(w1_therm_families); ++i) { - if (w1_therm_families[i].f->fid == sl->family->fid) { - /* zero value indicates to write current configuration to eeprom */ - if (val == 0) - ret = w1_therm_families[i].eeprom(device); - else - ret = w1_therm_families[i].precision(device, val); - break; + /* 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 = 1; /* Slave will pull line to 0 */ + while (ret) + ret = 1 - w1_touch_bit(dev_master, 1); } + } - return ret ? : size; + + mutex_unlock(&dev_master->bus_mutex); + +dec_refcnt: + atomic_dec(THERM_REFCNT(sl->family_data)); +error: + return ret; } -static ssize_t read_therm(struct device *device, - struct w1_slave *sl, struct therm_info *info) +static int read_powermode(struct w1_slave *sl) { - struct w1_master *dev = sl->master; - u8 external_power; - int ret, max_trying = 10; - u8 *family_data = sl->family_data; + struct w1_master *dev_master = sl->master; + int max_trying = W1_THERM_MAX_TRY; + int ret = -ENODEV; - if (!family_data) { - ret = -ENODEV; + if (!sl->family_data) goto error; - } /* prevent the slave from going away in sleep */ - atomic_inc(THERM_REFCNT(family_data)); + atomic_inc(THERM_REFCNT(sl->family_data)); - ret = mutex_lock_interruptible(&dev->bus_mutex); - if (ret != 0) + if (!bus_mutex_lock(&dev_master->bus_mutex)) { + ret = -EAGAIN; /* Didn't acquire the mutex */ goto dec_refcnt; + } - memset(info->rom, 0, sizeof(info->rom)); + 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); - while (max_trying--) { +dec_refcnt: + atomic_dec(THERM_REFCNT(sl->family_data)); +error: + return ret; +} - info->verdict = 0; - info->crc = 0; +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)); + } + } - if (!w1_reset_select_slave(sl)) { - int count = 0; - unsigned int tm = 750; - unsigned long sleep_rem; + /* + * 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; - w1_write_8(dev, W1_READ_PSUPPLY); - external_power = w1_read_8(dev); + if (!bus_mutex_lock(&dev_master->bus_mutex)) { + ret = -EAGAIN; /* Didn't acquire the mutex */ + goto error; + } - if (w1_reset_select_slave(sl)) - continue; + while ((max_trying--) && (ret < 0)) { /* ret should be either 0 */ - /* 750ms strong pullup (or delay) after the convert */ - if (w1_strong_pullup == 2 || - (!external_power && w1_strong_pullup)) - w1_next_pullup(dev, tm); + if (!w1_reset_bus(dev_master)) { /* Just reset the bus */ + unsigned long sleep_rem; - w1_write_8(dev, W1_CONVERT_TEMP); + w1_write_8(dev_master, W1_SKIP_ROM); - if (external_power) { - mutex_unlock(&dev->bus_mutex); + if (strong_pullup) /* Apply pullup if required */ + w1_next_pullup(dev_master, t_conv); - sleep_rem = msleep_interruptible(tm); - if (sleep_rem != 0) { - ret = -EINTR; - goto dec_refcnt; - } + w1_write_8(dev_master, W1_CONVERT_TEMP); - ret = mutex_lock_interruptible(&dev->bus_mutex); - if (ret != 0) - goto dec_refcnt; - } else if (!w1_strong_pullup) { - sleep_rem = msleep_interruptible(tm); + /* 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; } - } - - if (!w1_reset_select_slave(sl)) { - - w1_write_8(dev, W1_READ_SCRATCHPAD); - count = w1_read_block(dev, info->rom, 9); - if (count != 9) { - dev_warn(device, "w1_read_block() " - "returned %u instead of 9.\n", - count); + 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; } - - info->crc = w1_calc_crc8(info->rom, 8); - - if (info->rom[8] == info->crc) - info->verdict = 1; } + ret = 0; + goto set_flag; } - - if (info->verdict) - break; } mt_unlock: - mutex_unlock(&dev->bus_mutex); -dec_refcnt: - atomic_dec(THERM_REFCNT(family_data)); + 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) { @@ -572,43 +1272,405 @@ static ssize_t w1_slave_show(struct device *device, u8 *family_data = sl->family_data; int ret, i; ssize_t c = PAGE_SIZE; - u8 fid = sl->family->fid; - ret = read_therm(device, sl, &info); - if (ret) - return ret; + 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, "Read failed CRC check\n"); + 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", - w1_convert_temp(info.rom, fid)); + 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_info(device, + "%s: writing error %d\n", __func__, ret); + /* return size to avoid call back again */ + } else + SLAVE_RESOLUTION(sl) = val; + + 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) { + dev_info(device, + "%s: writing error %d\n", __func__, ret); + /* return size to avoid call back again */ + } else + SLAVE_RESOLUTION(sl) = val; + + return size; +} + +static ssize_t eeprom_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); +} + #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; - u8 fid = sl->family->fid; int ret; switch (attr) { case hwmon_temp_input: - ret = read_therm(device, sl, &info); + ret = convert_t(sl, &info); if (ret) return ret; @@ -617,7 +1679,7 @@ static int w1_read_temp(struct device *device, u32 attr, int channel, return ret; } - *val = w1_convert_temp(info.rom, fid); + *val = temperature_from_RAM(sl, info.rom); ret = 0; break; default: @@ -666,7 +1728,7 @@ static ssize_t w1_seq_show(struct device *device, if (ack != W1_42_SUCCESS_CONFIRM_BYTE) goto error; - /* In case the bus fails to send 0xFF, limit*/ + /* In case the bus fails to send 0xFF, limit */ for (i = 0; i <= 64; i++) { if (w1_reset_bus(sl->master)) goto error; |