165 lines
3.3 KiB
C
165 lines
3.3 KiB
C
/*
|
|
* Copyright (C) 2007 Sascha Hauer, Pengutronix
|
|
* 2009 Marc Kleine-Budde <mkl@pengutronix.de>
|
|
*
|
|
* 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>
|
|
#include <mfd/mc13892.h>
|
|
|
|
#define DRIVERNAME "mc13892"
|
|
|
|
#define to_mc13892(a) container_of(a, struct mc13892, cdev)
|
|
|
|
static struct mc13892 *mc_dev;
|
|
|
|
struct mc13892 *mc13892_get(void)
|
|
{
|
|
if (!mc_dev)
|
|
return NULL;
|
|
|
|
return mc_dev;
|
|
}
|
|
EXPORT_SYMBOL(mc13892_get);
|
|
|
|
int mc13892_reg_read(struct mc13892 *mc13892, enum mc13892_reg reg, u32 *val)
|
|
{
|
|
u8 buf[3];
|
|
int ret;
|
|
|
|
ret = i2c_read_reg(mc13892->client, reg, buf, 3);
|
|
*val = buf[0] << 16 | buf[1] << 8 | buf[2] << 0;
|
|
|
|
return ret == 3 ? 0 : ret;
|
|
}
|
|
EXPORT_SYMBOL(mc13892_reg_read)
|
|
|
|
int mc13892_reg_write(struct mc13892 *mc13892, enum mc13892_reg reg, u32 val)
|
|
{
|
|
u8 buf[] = {
|
|
val >> 16,
|
|
val >> 8,
|
|
val >> 0,
|
|
};
|
|
int ret;
|
|
|
|
ret = i2c_write_reg(mc13892->client, reg, buf, 3);
|
|
|
|
return ret == 3 ? 0 : ret;
|
|
}
|
|
EXPORT_SYMBOL(mc13892_reg_write)
|
|
|
|
int mc13892_set_bits(struct mc13892 *mc13892, enum mc13892_reg reg, u32 mask, u32 val)
|
|
{
|
|
u32 tmp;
|
|
int err;
|
|
|
|
err = mc13892_reg_read(mc13892, reg, &tmp);
|
|
tmp = (tmp & ~mask) | val;
|
|
|
|
if (!err)
|
|
err = mc13892_reg_write(mc13892, reg, tmp);
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(mc13892_set_bits);
|
|
|
|
static ssize_t mc_read(struct cdev *cdev, void *_buf, size_t count, ulong offset, ulong flags)
|
|
{
|
|
struct mc13892 *priv = to_mc13892(cdev);
|
|
u32 *buf = _buf;
|
|
size_t i = count >> 2;
|
|
int err;
|
|
|
|
offset >>= 2;
|
|
|
|
while (i) {
|
|
err = mc13892_reg_read(priv, offset, buf);
|
|
if (err)
|
|
return (ssize_t)err;
|
|
buf++;
|
|
i--;
|
|
offset++;
|
|
}
|
|
|
|
return count;
|
|
}
|
|
|
|
static ssize_t mc_write(struct cdev *cdev, const void *_buf, size_t count, ulong offset, ulong flags)
|
|
{
|
|
struct mc13892 *mc13892 = to_mc13892(cdev);
|
|
const u32 *buf = _buf;
|
|
size_t i = count >> 2;
|
|
int err;
|
|
|
|
offset >>= 2;
|
|
|
|
while (i) {
|
|
err = mc13892_reg_write(mc13892, offset, *buf);
|
|
if (err)
|
|
return (ssize_t)err;
|
|
buf++;
|
|
i--;
|
|
offset++;
|
|
}
|
|
|
|
return count;
|
|
}
|
|
|
|
static struct file_operations mc_fops = {
|
|
.lseek = dev_lseek_default,
|
|
.read = mc_read,
|
|
.write = mc_write,
|
|
};
|
|
|
|
static int mc_probe(struct device_d *dev)
|
|
{
|
|
if (mc_dev)
|
|
return -EBUSY;
|
|
|
|
mc_dev = xzalloc(sizeof(struct mc13892));
|
|
mc_dev->cdev.name = DRIVERNAME;
|
|
mc_dev->client = to_i2c_client(dev);
|
|
mc_dev->cdev.size = 256;
|
|
mc_dev->cdev.dev = dev;
|
|
mc_dev->cdev.ops = &mc_fops;
|
|
|
|
devfs_create(&mc_dev->cdev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct driver_d mc_driver = {
|
|
.name = DRIVERNAME,
|
|
.probe = mc_probe,
|
|
};
|
|
|
|
static int mc_init(void)
|
|
{
|
|
register_driver(&mc_driver);
|
|
return 0;
|
|
}
|
|
|
|
device_initcall(mc_init);
|