150 lines
3.0 KiB
C
150 lines
3.0 KiB
C
/*
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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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* 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/mc9sdz60.h>
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#define DRIVERNAME "mc9sdz60"
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#define to_mc9sdz60(a) container_of(a, struct mc9sdz60, cdev)
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static struct mc9sdz60 *mc_dev;
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struct mc9sdz60 *mc9sdz60_get(void)
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{
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if (!mc_dev)
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return NULL;
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return mc_dev;
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}
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EXPORT_SYMBOL(mc9sdz60_get);
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int mc9sdz60_reg_read(struct mc9sdz60 *mc9sdz60, enum mc9sdz60_reg reg, u8 *val)
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{
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int ret;
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ret = i2c_read_reg(mc9sdz60->client, reg, val, 1);
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return ret == 1 ? 0 : ret;
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}
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EXPORT_SYMBOL(mc9sdz60_reg_read);
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int mc9sdz60_reg_write(struct mc9sdz60 *mc9sdz60, enum mc9sdz60_reg reg, u8 val)
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{
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int ret;
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ret = i2c_write_reg(mc9sdz60->client, reg, &val, 1);
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return ret == 1 ? 0 : ret;
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}
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EXPORT_SYMBOL(mc9sdz60_reg_write);
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int mc9sdz60_set_bits(struct mc9sdz60 *mc9sdz60, enum mc9sdz60_reg reg, 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 = mc9sdz60_reg_read(mc9sdz60, reg, &tmp);
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tmp = (tmp & ~mask) | val;
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if (!err)
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err = mc9sdz60_reg_write(mc9sdz60, reg, tmp);
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return err;
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}
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EXPORT_SYMBOL(mc9sdz60_set_bits);
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static ssize_t mc_read(struct cdev *cdev, void *_buf, size_t count, loff_t offset, ulong flags)
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{
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struct mc9sdz60 *mc9sdz60 = to_mc9sdz60(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 = mc9sdz60_reg_read(mc9sdz60, 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 mc_write(struct cdev *cdev, const void *_buf, size_t count, loff_t offset, ulong flags)
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{
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struct mc9sdz60 *mc9sdz60 = to_mc9sdz60(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 = mc9sdz60_reg_write(mc9sdz60, 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 mc_fops = {
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.lseek = dev_lseek_default,
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.read = mc_read,
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.write = mc_write,
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};
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static int mc_probe(struct device_d *dev)
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{
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if (mc_dev)
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return -EBUSY;
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mc_dev = xzalloc(sizeof(struct mc9sdz60));
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mc_dev->cdev.name = DRIVERNAME;
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mc_dev->client = to_i2c_client(dev);
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mc_dev->cdev.size = 64; /* 35 known registers */
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mc_dev->cdev.dev = dev;
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mc_dev->cdev.ops = &mc_fops;
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devfs_create(&mc_dev->cdev);
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return 0;
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}
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static struct driver_d mc_driver = {
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.name = DRIVERNAME,
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.probe = mc_probe,
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};
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static int mc_init(void)
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{
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i2c_driver_register(&mc_driver);
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return 0;
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}
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device_initcall(mc_init);
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