forked from Minki/linux
939fc83229
The helper macro module_w1_family can be used in module drivers that only register a w1 driver in their module init functions. Add this macro and use it in all applicable drivers. Link: http://lkml.kernel.org/r/20160531204313.20979-2-afd@ti.com Signed-off-by: Andrew F. Davis <afd@ti.com> Acked-by: Evgeniy Polyakov <zbr@ioremap.net> Cc: Greg KH <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
139 lines
3.4 KiB
C
139 lines
3.4 KiB
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;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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);
|