155 lines
3.1 KiB
C
155 lines
3.1 KiB
C
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/*
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* Copyright (C) 2007 Sascha Hauer, Pengutronix
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* 2009 Marc Kleine-Budde <mkl@pengutronix.de>
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*
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* Copied from drivers/mfd/mc9sdz60.c
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*
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*/
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#include <common.h>
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#include <init.h>
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#include <driver.h>
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#include <xfuncs.h>
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#include <errno.h>
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#include <i2c/i2c.h>
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#include <mfd/act8846.h>
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#define DRIVERNAME "act8846"
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#define to_act8846(a) container_of(a, struct act8846, cdev)
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static struct act8846 *act8846_dev;
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struct act8846 *act8846_get(void)
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{
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if (!act8846_dev)
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return NULL;
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return act8846_dev;
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}
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EXPORT_SYMBOL(act8846_get);
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int act8846_reg_read(struct act8846 *act8846, enum act8846_reg reg, u8 *val)
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{
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int ret;
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ret = i2c_read_reg(act8846->client, reg, val, 1);
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return ret == 1 ? 0 : ret;
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}
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EXPORT_SYMBOL(act8846_reg_read);
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int act8846_reg_write(struct act8846 *act8846, enum act8846_reg reg, u8 val)
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{
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int ret;
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ret = i2c_write_reg(act8846->client, reg, &val, 1);
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return ret == 1 ? 0 : ret;
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}
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EXPORT_SYMBOL(act8846_reg_write);
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int act8846_set_bits(struct act8846 *act8846, enum act8846_reg reg,
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u8 mask, u8 val)
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{
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u8 tmp;
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int err;
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err = act8846_reg_read(act8846, reg, &tmp);
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tmp = (tmp & ~mask) | val;
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if (!err)
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err = act8846_reg_write(act8846, reg, tmp);
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return err;
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}
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EXPORT_SYMBOL(act8846_set_bits);
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static ssize_t act8846_read(struct cdev *cdev, void *_buf, size_t count,
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loff_t offset, ulong flags)
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{
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struct act8846 *act8846 = to_act8846(cdev);
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u8 *buf = _buf;
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size_t i = count;
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int err;
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while (i) {
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err = act8846_reg_read(act8846, offset, buf);
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if (err)
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return (ssize_t)err;
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buf++;
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i--;
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offset++;
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}
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return count;
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}
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static ssize_t act8846_write(struct cdev *cdev, const void *_buf, size_t count,
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loff_t offset, ulong flags)
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{
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struct act8846 *act8846 = to_act8846(cdev);
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const u8 *buf = _buf;
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size_t i = count;
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int err;
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while (i) {
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err = act8846_reg_write(act8846, offset, *buf);
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if (err)
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return (ssize_t)err;
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buf++;
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i--;
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offset++;
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}
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return count;
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}
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static struct file_operations act8846_fops = {
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.lseek = dev_lseek_default,
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.read = act8846_read,
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.write = act8846_write,
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};
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static int act8846_probe(struct device_d *dev)
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{
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if (act8846_dev)
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return -EBUSY;
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act8846_dev = xzalloc(sizeof(struct act8846));
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act8846_dev->cdev.name = DRIVERNAME;
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act8846_dev->client = to_i2c_client(dev);
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act8846_dev->cdev.size = 64;
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act8846_dev->cdev.dev = dev;
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act8846_dev->cdev.ops = &act8846_fops;
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devfs_create(&act8846_dev->cdev);
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return 0;
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}
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static struct driver_d act8846_driver = {
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.name = DRIVERNAME,
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.probe = act8846_probe,
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};
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static int act8846_init(void)
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{
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i2c_driver_register(&act8846_driver);
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return 0;
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}
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device_initcall(act8846_init);
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