// SPDX-License-Identifier: GPL-2.0-only /* * w1_ds28e17.c - w1 family 19 (DS28E17) driver * * Copyright (c) 2016 Jan Kandziora <[email protected]> */ #include <linux/crc16.h> #include <linux/delay.h> #include <linux/device.h> #include <linux/i2c.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/slab.h> #include <linux/types.h> #include <linux/uaccess.h> #define CRC16_INIT … #include <linux/w1.h> #define W1_FAMILY_DS28E17 … /* Module setup. */ MODULE_LICENSE(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_ALIAS(…) …; /* Default I2C speed to be set when a DS28E17 is detected. */ static int i2c_speed = …; module_param_named(speed, i2c_speed, int, 0600); MODULE_PARM_DESC(…) …; /* Default I2C stretch value to be set when a DS28E17 is detected. */ static char i2c_stretch = …; module_param_named(stretch, i2c_stretch, byte, 0600); MODULE_PARM_DESC(…) …; /* DS28E17 device command codes. */ #define W1_F19_WRITE_DATA_WITH_STOP … #define W1_F19_WRITE_DATA_NO_STOP … #define W1_F19_WRITE_DATA_ONLY … #define W1_F19_WRITE_DATA_ONLY_WITH_STOP … #define W1_F19_READ_DATA_WITH_STOP … #define W1_F19_WRITE_READ_DATA_WITH_STOP … #define W1_F19_WRITE_CONFIGURATION … #define W1_F19_READ_CONFIGURATION … #define W1_F19_ENABLE_SLEEP_MODE … #define W1_F19_READ_DEVICE_REVISION … /* DS28E17 status bits */ #define W1_F19_STATUS_CRC … #define W1_F19_STATUS_ADDRESS … #define W1_F19_STATUS_START … /* * Maximum number of I2C bytes to transfer within one CRC16 protected onewire * command. */ #define W1_F19_WRITE_DATA_LIMIT … /* Maximum number of I2C bytes to read with one onewire command. */ #define W1_F19_READ_DATA_LIMIT … /* Constants for calculating the busy sleep. */ #define W1_F19_BUSY_TIMEBASES … #define W1_F19_BUSY_GRATUITY … /* Number of checks for the busy flag before timeout. */ #define W1_F19_BUSY_CHECKS … /* Slave specific data. */ struct w1_f19_data { … }; /* Wait a while until the busy flag clears. */ static int w1_f19_i2c_busy_wait(struct w1_slave *sl, size_t count) { … } /* Utility function: result. */ static size_t w1_f19_error(struct w1_slave *sl, u8 w1_buf[]) { … } /* Utility function: write data to I2C slave, single chunk. */ static int __w1_f19_i2c_write(struct w1_slave *sl, const u8 *command, size_t command_count, const u8 *buffer, size_t count) { … } /* Write data to I2C slave. */ static int w1_f19_i2c_write(struct w1_slave *sl, u16 i2c_address, const u8 *buffer, size_t count, bool stop) { … } /* Read data from I2C slave. */ static int w1_f19_i2c_read(struct w1_slave *sl, u16 i2c_address, u8 *buffer, size_t count) { … } /* Write to, then read data from I2C slave. */ static int w1_f19_i2c_write_read(struct w1_slave *sl, u16 i2c_address, const u8 *wbuffer, size_t wcount, u8 *rbuffer, size_t rcount) { … } /* Do an I2C master transfer. */ static int w1_f19_i2c_master_transfer(struct i2c_adapter *adapter, struct i2c_msg *msgs, int num) { … } /* Get I2C adapter functionality. */ static u32 w1_f19_i2c_functionality(struct i2c_adapter *adapter) { … } /* I2C adapter quirks. */ static const struct i2c_adapter_quirks w1_f19_i2c_adapter_quirks = …; /* I2C algorithm. */ static const struct i2c_algorithm w1_f19_i2c_algorithm = …; /* Read I2C speed from DS28E17. */ static int w1_f19_get_i2c_speed(struct w1_slave *sl) { … } /* Set I2C speed on DS28E17. */ static int __w1_f19_set_i2c_speed(struct w1_slave *sl, u8 speed) { … } static int w1_f19_set_i2c_speed(struct w1_slave *sl, u8 speed) { … } /* Sysfs attributes. */ /* I2C speed attribute for a single chip. */ static ssize_t speed_show(struct device *dev, struct device_attribute *attr, char *buf) { … } static ssize_t speed_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { … } static DEVICE_ATTR_RW(speed); /* Busy stretch attribute for a single chip. */ static ssize_t stretch_show(struct device *dev, struct device_attribute *attr, char *buf) { … } static ssize_t stretch_store(struct device *dev, struct device_attribute *attr, const char *buf, size_t count) { … } static DEVICE_ATTR_RW(stretch); /* All attributes. */ static struct attribute *w1_f19_attrs[] = …; static const struct attribute_group w1_f19_group = …; static const struct attribute_group *w1_f19_groups[] = …; /* Slave add and remove functions. */ static int w1_f19_add_slave(struct w1_slave *sl) { … } static void w1_f19_remove_slave(struct w1_slave *sl) { … } /* Declarations within the w1 subsystem. */ static const struct w1_family_ops w1_f19_fops = …; static struct w1_family w1_family_19 = …; module_w1_family(…);
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