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Release 4.11 drivers/w1/slaves/w1_ds2413.c

/*
 * w1_ds2413.c - w1 family 3a (DS2413) driver
 * based on w1_ds2408.c by Jean-Francois Dagenais <dagenaisj@sonatest.com>
 *
 * Copyright (c) 2013 Mariusz Bialonczyk <manio@skyboo.net>
 *
 * This source code is licensed under the GNU General Public License,
 * Version 2. See the file COPYING for more details.
 */

#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 "../w1.h"
#include "../w1_int.h"
#include "../w1_family.h"

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Mariusz Bialonczyk <manio@skyboo.net>");
MODULE_DESCRIPTION("w1 family 3a driver for DS2413 2 Pin IO");
MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_DS2413));


#define W1_F3A_RETRIES                     3

#define W1_F3A_FUNC_PIO_ACCESS_READ        0xF5

#define W1_F3A_FUNC_PIO_ACCESS_WRITE       0x5A

#define W1_F3A_SUCCESS_CONFIRM_BYTE        0xAA


static ssize_t state_read(struct file *filp, struct kobject *kobj, struct bin_attribute *bin_attr, char *buf, loff_t off, size_t count) { struct w1_slave *sl = kobj_to_w1_slave(kobj); dev_dbg(&sl->dev, "Reading %s kobj: %p, off: %0#10x, count: %zu, buff addr: %p", bin_attr->attr.name, kobj, (unsigned int)off, count, buf); if (off != 0) return 0; if (!buf) return -EINVAL; mutex_lock(&sl->master->bus_mutex); dev_dbg(&sl->dev, "mutex locked"); if (w1_reset_select_slave(sl)) { mutex_unlock(&sl->master->bus_mutex); return -EIO; } w1_write_8(sl->master, W1_F3A_FUNC_PIO_ACCESS_READ); *buf = w1_read_8(sl->master); mutex_unlock(&sl->master->bus_mutex); dev_dbg(&sl->dev, "mutex unlocked"); /* check for correct complement */ if ((*buf & 0x0F) != ((~*buf >> 4) & 0x0F)) return -EIO; else return 1; }

Contributors

PersonTokensPropCommitsCommitProp
Mariusz Białończyk19899.50%150.00%
Greg Kroah-Hartman10.50%150.00%
Total199100.00%2100.00%

static BIN_ATTR_RO(state, 1);
static ssize_t output_write(struct file *filp, struct kobject *kobj, struct bin_attribute *bin_attr, char *buf, loff_t off, size_t count) { struct w1_slave *sl = kobj_to_w1_slave(kobj); u8 w1_buf[3]; unsigned int retries = W1_F3A_RETRIES; if (count != 1 || off != 0) return -EFAULT; dev_dbg(&sl->dev, "locking mutex for write_output"); mutex_lock(&sl->master->bus_mutex); dev_dbg(&sl->dev, "mutex locked"); if (w1_reset_select_slave(sl)) goto error; /* according to the DS2413 datasheet the most significant 6 bits should be set to "1"s, so do it now */ *buf = *buf | 0xFC; while (retries--) { w1_buf[0] = W1_F3A_FUNC_PIO_ACCESS_WRITE; w1_buf[1] = *buf; w1_buf[2] = ~(*buf); w1_write_block(sl->master, w1_buf, 3); if (w1_read_8(sl->master) == W1_F3A_SUCCESS_CONFIRM_BYTE) { mutex_unlock(&sl->master->bus_mutex); dev_dbg(&sl->dev, "mutex unlocked, retries:%d", retries); return 1; } if (w1_reset_resume_command(sl->master)) goto error; } error: mutex_unlock(&sl->master->bus_mutex); dev_dbg(&sl->dev, "mutex unlocked in error, retries:%d", retries); return -EIO; }

Contributors

PersonTokensPropCommitsCommitProp
Mariusz Białończyk23799.58%150.00%
Greg Kroah-Hartman10.42%150.00%
Total238100.00%2100.00%

static BIN_ATTR(output, S_IRUGO | S_IWUSR | S_IWGRP, NULL, output_write, 1); static struct bin_attribute *w1_f3a_bin_attrs[] = { &bin_attr_state, &bin_attr_output, NULL, }; static const struct attribute_group w1_f3a_group = { .bin_attrs = w1_f3a_bin_attrs, }; static const struct attribute_group *w1_f3a_groups[] = { &w1_f3a_group, NULL, }; static struct w1_family_ops w1_f3a_fops = { .groups = w1_f3a_groups, }; static struct w1_family w1_family_3a = { .fid = W1_FAMILY_DS2413, .fops = &w1_f3a_fops, }; module_w1_family(w1_family_3a);

Overall Contributors

PersonTokensPropCommitsCommitProp
Mariusz Białończyk54789.09%125.00%
Greg Kroah-Hartman569.12%125.00%
Alexander Stein91.47%125.00%
Andrew F. Davis20.33%125.00%
Total614100.00%4100.00%
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