164 строки
3.6 KiB
C
164 строки
3.6 KiB
C
/*
|
|
* 1-Wire implementation for the ds2780 chip
|
|
*
|
|
* Copyright (C) 2010 Indesign, LLC
|
|
*
|
|
* Author: Clifton Barnes <cabarnes@indesign-llc.com>
|
|
*
|
|
* Based on w1-ds2760 driver
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/device.h>
|
|
#include <linux/types.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/idr.h>
|
|
|
|
#include <linux/w1.h>
|
|
|
|
#include "w1_ds2780.h"
|
|
|
|
#define W1_FAMILY_DS2780 0x32
|
|
|
|
static int w1_ds2780_do_io(struct device *dev, char *buf, int addr,
|
|
size_t count, int io)
|
|
{
|
|
struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
|
|
|
|
if (addr > DS2780_DATA_SIZE || addr < 0)
|
|
return 0;
|
|
|
|
count = min_t(int, count, DS2780_DATA_SIZE - addr);
|
|
|
|
if (w1_reset_select_slave(sl) == 0) {
|
|
if (io) {
|
|
w1_write_8(sl->master, W1_DS2780_WRITE_DATA);
|
|
w1_write_8(sl->master, addr);
|
|
w1_write_block(sl->master, buf, count);
|
|
} else {
|
|
w1_write_8(sl->master, W1_DS2780_READ_DATA);
|
|
w1_write_8(sl->master, addr);
|
|
count = w1_read_block(sl->master, buf, count);
|
|
}
|
|
}
|
|
|
|
return count;
|
|
}
|
|
|
|
int w1_ds2780_io(struct device *dev, char *buf, int addr, size_t count,
|
|
int io)
|
|
{
|
|
struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
|
|
int ret;
|
|
|
|
if (!dev)
|
|
return -ENODEV;
|
|
|
|
mutex_lock(&sl->master->bus_mutex);
|
|
|
|
ret = w1_ds2780_do_io(dev, buf, addr, count, io);
|
|
|
|
mutex_unlock(&sl->master->bus_mutex);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(w1_ds2780_io);
|
|
|
|
int w1_ds2780_eeprom_cmd(struct device *dev, int addr, int cmd)
|
|
{
|
|
struct w1_slave *sl = container_of(dev, struct w1_slave, dev);
|
|
|
|
if (!dev)
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&sl->master->bus_mutex);
|
|
|
|
if (w1_reset_select_slave(sl) == 0) {
|
|
w1_write_8(sl->master, cmd);
|
|
w1_write_8(sl->master, addr);
|
|
}
|
|
|
|
mutex_unlock(&sl->master->bus_mutex);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(w1_ds2780_eeprom_cmd);
|
|
|
|
static ssize_t w1_slave_read(struct file *filp, struct kobject *kobj,
|
|
struct bin_attribute *bin_attr, char *buf,
|
|
loff_t off, size_t count)
|
|
{
|
|
struct device *dev = container_of(kobj, struct device, kobj);
|
|
return w1_ds2780_io(dev, buf, off, count, 0);
|
|
}
|
|
|
|
static BIN_ATTR_RO(w1_slave, DS2780_DATA_SIZE);
|
|
|
|
static struct bin_attribute *w1_ds2780_bin_attrs[] = {
|
|
&bin_attr_w1_slave,
|
|
NULL,
|
|
};
|
|
|
|
static const struct attribute_group w1_ds2780_group = {
|
|
.bin_attrs = w1_ds2780_bin_attrs,
|
|
};
|
|
|
|
static const struct attribute_group *w1_ds2780_groups[] = {
|
|
&w1_ds2780_group,
|
|
NULL,
|
|
};
|
|
|
|
static int w1_ds2780_add_slave(struct w1_slave *sl)
|
|
{
|
|
int ret;
|
|
struct platform_device *pdev;
|
|
|
|
pdev = platform_device_alloc("ds2780-battery", PLATFORM_DEVID_AUTO);
|
|
if (!pdev)
|
|
return -ENOMEM;
|
|
pdev->dev.parent = &sl->dev;
|
|
|
|
ret = platform_device_add(pdev);
|
|
if (ret)
|
|
goto pdev_add_failed;
|
|
|
|
dev_set_drvdata(&sl->dev, pdev);
|
|
|
|
return 0;
|
|
|
|
pdev_add_failed:
|
|
platform_device_put(pdev);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void w1_ds2780_remove_slave(struct w1_slave *sl)
|
|
{
|
|
struct platform_device *pdev = dev_get_drvdata(&sl->dev);
|
|
|
|
platform_device_unregister(pdev);
|
|
}
|
|
|
|
static struct w1_family_ops w1_ds2780_fops = {
|
|
.add_slave = w1_ds2780_add_slave,
|
|
.remove_slave = w1_ds2780_remove_slave,
|
|
.groups = w1_ds2780_groups,
|
|
};
|
|
|
|
static struct w1_family w1_ds2780_family = {
|
|
.fid = W1_FAMILY_DS2780,
|
|
.fops = &w1_ds2780_fops,
|
|
};
|
|
module_w1_family(w1_ds2780_family);
|
|
|
|
MODULE_AUTHOR("Clifton Barnes <cabarnes@indesign-llc.com>");
|
|
MODULE_DESCRIPTION("1-wire Driver for Maxim/Dallas DS2780 Stand-Alone Fuel Gauge IC");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("w1-family-" __stringify(W1_FAMILY_DS2780));
|