// SPDX-License-Identifier: GPL-2.0-only /* * w1_ds2431.c - w1 family 2d (DS2431) driver * * Copyright (c) 2008 Bernhard Weirich <[email protected]> * * Heavily inspired by w1_DS2433 driver from Ben Gardner <[email protected]> */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/moduleparam.h> #include <linux/device.h> #include <linux/types.h> #include <linux/delay.h> #include <linux/w1.h> #define W1_EEPROM_DS2431 … #define W1_F2D_EEPROM_SIZE … #define W1_F2D_PAGE_COUNT … #define W1_F2D_PAGE_BITS … #define W1_F2D_PAGE_SIZE … #define W1_F2D_PAGE_MASK … #define W1_F2D_SCRATCH_BITS … #define W1_F2D_SCRATCH_SIZE … #define W1_F2D_SCRATCH_MASK … #define W1_F2D_READ_EEPROM … #define W1_F2D_WRITE_SCRATCH … #define W1_F2D_READ_SCRATCH … #define W1_F2D_COPY_SCRATCH … #define W1_F2D_TPROG_MS … #define W1_F2D_READ_RETRIES … #define W1_F2D_READ_MAXLEN … /* * Check the file size bounds and adjusts count as needed. * This would not be needed if the file size didn't reset to 0 after a write. */ static inline size_t w1_f2d_fix_count(loff_t off, size_t count, size_t size) { … } /* * Read a block from W1 ROM two times and compares the results. * If they are equal they are returned, otherwise the read * is repeated W1_F2D_READ_RETRIES times. * * count must not exceed W1_F2D_READ_MAXLEN. */ static int w1_f2d_readblock(struct w1_slave *sl, int off, int count, char *buf) { … } static ssize_t eeprom_read(struct file *filp, struct kobject *kobj, struct bin_attribute *bin_attr, char *buf, loff_t off, size_t count) { … } /* * Writes to the scratchpad and reads it back for verification. * Then copies the scratchpad to EEPROM. * The data must be aligned at W1_F2D_SCRATCH_SIZE bytes and * must be W1_F2D_SCRATCH_SIZE bytes long. * The master must be locked. * * @param sl The slave structure * @param addr Address for the write * @param len length must be <= (W1_F2D_PAGE_SIZE - (addr & W1_F2D_PAGE_MASK)) * @param data The data to write * @return 0=Success -1=failure */ static int w1_f2d_write(struct w1_slave *sl, int addr, int len, const u8 *data) { … } static ssize_t eeprom_write(struct file *filp, struct kobject *kobj, struct bin_attribute *bin_attr, char *buf, loff_t off, size_t count) { … } static BIN_ATTR_RW(eeprom, W1_F2D_EEPROM_SIZE); static struct bin_attribute *w1_f2d_bin_attrs[] = …; static const struct attribute_group w1_f2d_group = …; static const struct attribute_group *w1_f2d_groups[] = …; static const struct w1_family_ops w1_f2d_fops = …; static struct w1_family w1_family_2d = …; module_w1_family(…); MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …; MODULE_ALIAS(…) …;
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