155 lines
3.1 KiB
C
155 lines
3.1 KiB
C
/*
|
|
* Copyright (C) 2007 Sascha Hauer, Pengutronix
|
|
* 2009 Marc Kleine-Budde <mkl@pengutronix.de>
|
|
*
|
|
* Copied from drivers/mfd/mc9sdz60.c
|
|
*
|
|
* 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.
|
|
*
|
|
*
|
|
*/
|
|
|
|
#include <common.h>
|
|
#include <init.h>
|
|
#include <driver.h>
|
|
#include <xfuncs.h>
|
|
#include <errno.h>
|
|
|
|
#include <i2c/i2c.h>
|
|
#include <mfd/act8846.h>
|
|
|
|
#define DRIVERNAME "act8846"
|
|
|
|
#define to_act8846(a) container_of(a, struct act8846, cdev)
|
|
|
|
static struct act8846 *act8846_dev;
|
|
|
|
struct act8846 *act8846_get(void)
|
|
{
|
|
if (!act8846_dev)
|
|
return NULL;
|
|
|
|
return act8846_dev;
|
|
}
|
|
EXPORT_SYMBOL(act8846_get);
|
|
|
|
int act8846_reg_read(struct act8846 *act8846, enum act8846_reg reg, u8 *val)
|
|
{
|
|
int ret;
|
|
|
|
ret = i2c_read_reg(act8846->client, reg, val, 1);
|
|
|
|
return ret == 1 ? 0 : ret;
|
|
}
|
|
EXPORT_SYMBOL(act8846_reg_read);
|
|
|
|
int act8846_reg_write(struct act8846 *act8846, enum act8846_reg reg, u8 val)
|
|
{
|
|
int ret;
|
|
|
|
ret = i2c_write_reg(act8846->client, reg, &val, 1);
|
|
|
|
return ret == 1 ? 0 : ret;
|
|
}
|
|
EXPORT_SYMBOL(act8846_reg_write);
|
|
|
|
int act8846_set_bits(struct act8846 *act8846, enum act8846_reg reg,
|
|
u8 mask, u8 val)
|
|
{
|
|
u8 tmp;
|
|
int err;
|
|
|
|
err = act8846_reg_read(act8846, reg, &tmp);
|
|
tmp = (tmp & ~mask) | val;
|
|
|
|
if (!err)
|
|
err = act8846_reg_write(act8846, reg, tmp);
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(act8846_set_bits);
|
|
|
|
static ssize_t act8846_read(struct cdev *cdev, void *_buf, size_t count,
|
|
loff_t offset, ulong flags)
|
|
{
|
|
struct act8846 *act8846 = to_act8846(cdev);
|
|
u8 *buf = _buf;
|
|
size_t i = count;
|
|
int err;
|
|
|
|
while (i) {
|
|
err = act8846_reg_read(act8846, offset, buf);
|
|
if (err)
|
|
return (ssize_t)err;
|
|
buf++;
|
|
i--;
|
|
offset++;
|
|
}
|
|
|
|
return count;
|
|
}
|
|
|
|
static ssize_t act8846_write(struct cdev *cdev, const void *_buf, size_t count,
|
|
loff_t offset, ulong flags)
|
|
{
|
|
struct act8846 *act8846 = to_act8846(cdev);
|
|
const u8 *buf = _buf;
|
|
size_t i = count;
|
|
int err;
|
|
|
|
while (i) {
|
|
err = act8846_reg_write(act8846, offset, *buf);
|
|
if (err)
|
|
return (ssize_t)err;
|
|
buf++;
|
|
i--;
|
|
offset++;
|
|
}
|
|
|
|
return count;
|
|
}
|
|
|
|
static struct file_operations act8846_fops = {
|
|
.lseek = dev_lseek_default,
|
|
.read = act8846_read,
|
|
.write = act8846_write,
|
|
};
|
|
|
|
static int act8846_probe(struct device_d *dev)
|
|
{
|
|
if (act8846_dev)
|
|
return -EBUSY;
|
|
|
|
act8846_dev = xzalloc(sizeof(struct act8846));
|
|
act8846_dev->cdev.name = DRIVERNAME;
|
|
act8846_dev->client = to_i2c_client(dev);
|
|
act8846_dev->cdev.size = 64;
|
|
act8846_dev->cdev.dev = dev;
|
|
act8846_dev->cdev.ops = &act8846_fops;
|
|
|
|
devfs_create(&act8846_dev->cdev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct driver_d act8846_driver = {
|
|
.name = DRIVERNAME,
|
|
.probe = act8846_probe,
|
|
};
|
|
|
|
static int act8846_init(void)
|
|
{
|
|
i2c_driver_register(&act8846_driver);
|
|
return 0;
|
|
}
|
|
|
|
device_initcall(act8846_init);
|