2010-06-09 07:05:04 +00:00
|
|
|
/*
|
|
|
|
* Copyright (C) 2007 Sascha Hauer, Pengutronix
|
|
|
|
* 2009 Marc Kleine-Budde <mkl@pengutronix.de>
|
|
|
|
* Copyright (C) 2010 Baruch Siach <baruch@tkos.co.il>
|
|
|
|
*
|
|
|
|
* This program is free software; you can redistribute it and/or
|
|
|
|
* modify it under the terms of the GNU General Public License as
|
|
|
|
* published by the Free Software Foundation; either version 2 of
|
|
|
|
* the License, or (at your option) any later version.
|
|
|
|
*
|
|
|
|
* This program is distributed in the hope that it will be useful,
|
|
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
|
|
* GNU General Public License for more details.
|
|
|
|
*
|
|
|
|
* You should have received a copy of the GNU General Public License
|
|
|
|
* along with this program; if not, write to the Free Software
|
|
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
|
|
|
|
* MA 02111-1307 USA
|
|
|
|
*
|
|
|
|
*/
|
|
|
|
|
|
|
|
#include <common.h>
|
|
|
|
#include <init.h>
|
|
|
|
#include <driver.h>
|
|
|
|
#include <xfuncs.h>
|
|
|
|
#include <errno.h>
|
|
|
|
|
|
|
|
#include <i2c/i2c.h>
|
2010-10-10 17:51:15 +00:00
|
|
|
#include <mfd/mc34704.h>
|
2010-06-09 07:05:04 +00:00
|
|
|
|
|
|
|
#define DRIVERNAME "mc34704"
|
|
|
|
|
|
|
|
#define to_mc34704(a) container_of(a, struct mc34704, cdev)
|
|
|
|
|
|
|
|
static struct mc34704 *mc34704_dev;
|
|
|
|
|
|
|
|
struct mc34704 *mc34704_get(void)
|
|
|
|
{
|
|
|
|
if (!mc34704_dev)
|
|
|
|
return NULL;
|
|
|
|
|
|
|
|
return mc34704_dev;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(mc34704_get);
|
|
|
|
|
|
|
|
int mc34704_reg_read(struct mc34704 *mc34704, u8 reg, u8 *val)
|
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
ret = i2c_read_reg(mc34704->client, reg, val, 1);
|
|
|
|
|
|
|
|
return ret == 1 ? 0 : ret;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(mc34704_reg_read)
|
|
|
|
|
|
|
|
int mc34704_reg_write(struct mc34704 *mc34704, u8 reg, u8 val)
|
|
|
|
{
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
ret = i2c_write_reg(mc34704->client, reg, &val, 1);
|
|
|
|
|
|
|
|
return ret == 1 ? 0 : ret;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL(mc34704_reg_write)
|
|
|
|
|
|
|
|
static ssize_t mc34704_read(struct cdev *cdev, void *_buf, size_t count,
|
|
|
|
ulong offset, ulong flags)
|
|
|
|
{
|
|
|
|
struct mc34704 *priv = to_mc34704(cdev);
|
|
|
|
u8 *buf = _buf;
|
|
|
|
size_t i = count;
|
|
|
|
int err;
|
|
|
|
|
|
|
|
while (i) {
|
|
|
|
err = mc34704_reg_read(priv, offset, buf);
|
|
|
|
if (err)
|
|
|
|
return (ssize_t)err;
|
|
|
|
buf++;
|
|
|
|
i--;
|
|
|
|
offset++;
|
|
|
|
}
|
|
|
|
|
|
|
|
return count;
|
|
|
|
}
|
|
|
|
|
|
|
|
static ssize_t mc34704_write(struct cdev *cdev, const void *_buf, size_t count,
|
|
|
|
ulong offset, ulong flags)
|
|
|
|
{
|
|
|
|
struct mc34704 *mc34704 = to_mc34704(cdev);
|
|
|
|
const u8 *buf = _buf;
|
|
|
|
size_t i = count;
|
|
|
|
int err;
|
|
|
|
|
|
|
|
while (i) {
|
|
|
|
err = mc34704_reg_write(mc34704, offset, *buf);
|
|
|
|
if (err)
|
|
|
|
return (ssize_t)err;
|
|
|
|
buf++;
|
|
|
|
i--;
|
|
|
|
offset++;
|
|
|
|
}
|
|
|
|
|
|
|
|
return count;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct file_operations mc34704_fops = {
|
|
|
|
.lseek = dev_lseek_default,
|
|
|
|
.read = mc34704_read,
|
|
|
|
.write = mc34704_write,
|
|
|
|
};
|
|
|
|
|
|
|
|
static int mc34704_probe(struct device_d *dev)
|
|
|
|
{
|
|
|
|
if (mc34704_dev)
|
|
|
|
return -EBUSY;
|
|
|
|
|
|
|
|
mc34704_dev = xzalloc(sizeof(struct mc34704));
|
|
|
|
mc34704_dev->cdev.name = DRIVERNAME;
|
|
|
|
mc34704_dev->client = to_i2c_client(dev);
|
|
|
|
mc34704_dev->cdev.size = 256;
|
|
|
|
mc34704_dev->cdev.dev = dev;
|
|
|
|
mc34704_dev->cdev.ops = &mc34704_fops;
|
|
|
|
|
|
|
|
devfs_create(&mc34704_dev->cdev);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct driver_d mc34704_driver = {
|
|
|
|
.name = DRIVERNAME,
|
|
|
|
.probe = mc34704_probe,
|
|
|
|
};
|
|
|
|
|
|
|
|
static int mc34704_init(void)
|
|
|
|
{
|
|
|
|
register_driver(&mc34704_driver);
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
device_initcall(mc34704_init);
|