// SPDX-License-Identifier: GPL-2.0-only /* * w1_ds2408.c - w1 family 29 (DS2408) driver * * Copyright (c) 2010 Jean-Francois Dagenais <[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/slab.h> #include <linux/w1.h> #define W1_FAMILY_DS2408 … #define W1_F29_RETRIES … #define W1_F29_REG_LOGIG_STATE … #define W1_F29_REG_OUTPUT_LATCH_STATE … #define W1_F29_REG_ACTIVITY_LATCH_STATE … #define W1_F29_REG_COND_SEARCH_SELECT_MASK … #define W1_F29_REG_COND_SEARCH_POL_SELECT … #define W1_F29_REG_CONTROL_AND_STATUS … #define W1_F29_FUNC_READ_PIO_REGS … #define W1_F29_FUNC_CHANN_ACCESS_READ … #define W1_F29_FUNC_CHANN_ACCESS_WRITE … /* also used to write the control/status reg (0x8D): */ #define W1_F29_FUNC_WRITE_COND_SEARCH_REG … #define W1_F29_FUNC_RESET_ACTIVITY_LATCHES … #define W1_F29_SUCCESS_CONFIRM_BYTE … static int _read_reg(struct w1_slave *sl, u8 address, unsigned char *buf) { … } static ssize_t state_read(struct file *filp, struct kobject *kobj, struct bin_attribute *bin_attr, char *buf, loff_t off, size_t count) { … } static ssize_t output_read(struct file *filp, struct kobject *kobj, struct bin_attribute *bin_attr, char *buf, loff_t off, size_t count) { … } static ssize_t activity_read(struct file *filp, struct kobject *kobj, struct bin_attribute *bin_attr, char *buf, loff_t off, size_t count) { … } static ssize_t cond_search_mask_read(struct file *filp, struct kobject *kobj, struct bin_attribute *bin_attr, char *buf, loff_t off, size_t count) { … } static ssize_t cond_search_polarity_read(struct file *filp, struct kobject *kobj, struct bin_attribute *bin_attr, char *buf, loff_t off, size_t count) { … } static ssize_t status_control_read(struct file *filp, struct kobject *kobj, struct bin_attribute *bin_attr, char *buf, loff_t off, size_t count) { … } #ifdef CONFIG_W1_SLAVE_DS2408_READBACK static bool optional_read_back_valid(struct w1_slave *sl, u8 expected) { … } #else static bool optional_read_back_valid(struct w1_slave *sl, u8 expected) { return true; } #endif static ssize_t output_write(struct file *filp, struct kobject *kobj, struct bin_attribute *bin_attr, char *buf, loff_t off, size_t count) { … } /* * Writing to the activity file resets the activity latches. */ static ssize_t activity_write(struct file *filp, struct kobject *kobj, struct bin_attribute *bin_attr, char *buf, loff_t off, size_t count) { … } static ssize_t status_control_write(struct file *filp, struct kobject *kobj, struct bin_attribute *bin_attr, char *buf, loff_t off, size_t count) { … } /* * This is a special sequence we must do to ensure the P0 output is not stuck * in test mode. This is described in rev 2 of the ds2408's datasheet * (http://datasheets.maximintegrated.com/en/ds/DS2408.pdf) under * "APPLICATION INFORMATION/Power-up timing". */ static int w1_f29_disable_test_mode(struct w1_slave *sl) { … } static BIN_ATTR_RO(state, 1); static BIN_ATTR_RW(output, 1); static BIN_ATTR_RW(activity, 1); static BIN_ATTR_RO(cond_search_mask, 1); static BIN_ATTR_RO(cond_search_polarity, 1); static BIN_ATTR_RW(status_control, 1); static struct bin_attribute *w1_f29_bin_attrs[] = …; static const struct attribute_group w1_f29_group = …; static const struct attribute_group *w1_f29_groups[] = …; static const struct w1_family_ops w1_f29_fops = …; static struct w1_family w1_family_29 = …; module_w1_family(…); MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …; MODULE_ALIAS(…) …;
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