2010-01-15 10:50:18 +00:00
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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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* 2009 Eric Benard <eric@eukrea.com>
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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 <asm/byteorder.h>
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#define DRIVERNAME "lp3972"
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struct lp_priv {
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struct cdev cdev;
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struct i2c_client *client;
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};
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#define to_lp_priv(a) container_of(a, struct lp_priv, cdev)
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static struct lp_priv *lp_dev;
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struct i2c_client *lp3972_get_client(void)
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{
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if (!lp_dev)
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return NULL;
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return lp_dev->client;
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}
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static u32 lp_read_reg(struct lp_priv *lp, int reg)
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{
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u8 buf;
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i2c_read_reg(lp->client, reg, &buf, sizeof(buf));
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return buf;
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}
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2011-10-14 11:46:09 +00:00
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static ssize_t lp_read(struct cdev *cdev, void *_buf, size_t count, loff_t offset, ulong flags)
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2010-01-15 10:50:18 +00:00
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{
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struct lp_priv *priv = to_lp_priv(cdev);
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int i = count;
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u8 *buf = _buf;
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while (i) {
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*buf = lp_read_reg(priv, offset);
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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 lp_fops = {
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.lseek = dev_lseek_default,
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.read = lp_read,
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};
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static int lp_probe(struct device_d *dev)
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{
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if (lp_dev)
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return -EBUSY;
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lp_dev = xzalloc(sizeof(struct lp_priv));
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lp_dev->cdev.name = DRIVERNAME;
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lp_dev->client = to_i2c_client(dev);
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lp_dev->cdev.size = 256;
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lp_dev->cdev.dev = dev;
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lp_dev->cdev.ops = &lp_fops;
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devfs_create(&lp_dev->cdev);
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return 0;
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}
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static struct driver_d lp_driver = {
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.name = DRIVERNAME,
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.probe = lp_probe,
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};
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static int lp_init(void)
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{
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2013-03-10 06:41:34 +00:00
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i2c_driver_register(&lp_driver);
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2010-01-15 10:50:18 +00:00
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return 0;
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}
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device_initcall(lp_init);
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