i2c: add driver for the MC34704 PMIC
Signed-off-by: Baruch Siach <baruch@tkos.co.il> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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@ -10,6 +10,9 @@ config DRIVER_I2C_IMX
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config DRIVER_I2C_MC13892
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bool "MC13892 a.k.a. PMIC driver"
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config DRIVER_I2C_MC34704
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bool "MC34704 PMIC driver"
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config DRIVER_I2C_MC9SDZ60
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bool "MC9SDZ60 driver"
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@ -3,5 +3,6 @@ obj-$(CONFIG_I2C) += i2c.o
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obj-$(CONFIG_DRIVER_I2C_IMX) += i2c-imx.o
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obj-$(CONFIG_DRIVER_I2C_MC13892) += mc13892.o
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obj-$(CONFIG_DRIVER_I2C_MC34704) += mc34704.o
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obj-$(CONFIG_DRIVER_I2C_MC9SDZ60) += mc9sdz60.o
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obj-$(CONFIG_DRIVER_I2C_LP3972) += lp3972.o
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@ -0,0 +1,140 @@
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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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* Copyright (C) 2010 Baruch Siach <baruch@tkos.co.il>
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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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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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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 <i2c/mc34704.h>
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#define DRIVERNAME "mc34704"
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#define to_mc34704(a) container_of(a, struct mc34704, cdev)
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static struct mc34704 *mc34704_dev;
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struct mc34704 *mc34704_get(void)
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{
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if (!mc34704_dev)
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return NULL;
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return mc34704_dev;
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}
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EXPORT_SYMBOL(mc34704_get);
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int mc34704_reg_read(struct mc34704 *mc34704, u8 reg, u8 *val)
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{
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int ret;
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ret = i2c_read_reg(mc34704->client, reg, val, 1);
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return ret == 1 ? 0 : ret;
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}
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EXPORT_SYMBOL(mc34704_reg_read)
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int mc34704_reg_write(struct mc34704 *mc34704, u8 reg, u8 val)
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{
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int ret;
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ret = i2c_write_reg(mc34704->client, reg, &val, 1);
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return ret == 1 ? 0 : ret;
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}
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EXPORT_SYMBOL(mc34704_reg_write)
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static ssize_t mc34704_read(struct cdev *cdev, void *_buf, size_t count,
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ulong offset, ulong flags)
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{
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struct mc34704 *priv = to_mc34704(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 = mc34704_reg_read(priv, 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 mc34704_write(struct cdev *cdev, const void *_buf, size_t count,
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ulong offset, ulong flags)
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{
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struct mc34704 *mc34704 = to_mc34704(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 = mc34704_reg_write(mc34704, 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 mc34704_fops = {
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.lseek = dev_lseek_default,
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.read = mc34704_read,
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.write = mc34704_write,
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};
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static int mc34704_probe(struct device_d *dev)
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{
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if (mc34704_dev)
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return -EBUSY;
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mc34704_dev = xzalloc(sizeof(struct mc34704));
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mc34704_dev->cdev.name = DRIVERNAME;
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mc34704_dev->client = to_i2c_client(dev);
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mc34704_dev->cdev.size = 256;
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mc34704_dev->cdev.dev = dev;
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mc34704_dev->cdev.ops = &mc34704_fops;
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devfs_create(&mc34704_dev->cdev);
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return 0;
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}
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static struct driver_d mc34704_driver = {
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.name = DRIVERNAME,
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.probe = mc34704_probe,
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};
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static int mc34704_init(void)
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{
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register_driver(&mc34704_driver);
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return 0;
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}
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device_initcall(mc34704_init);
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@ -0,0 +1,26 @@
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/*
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* Copyright (C) 2009 Marc Kleine-Budde <mkl@pengutronix.de>
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* Copyright (C) 2010 Baruch Siach <baruch@tkos.co.il>
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*
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* This file is released under the GPLv2
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*
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* Derived from:
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* - arch-mxc/pmic_external.h -- contains interface of the PMIC protocol driver
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* Copyright 2008-2009 Freescale Semiconductor, Inc. All Rights Reserved.
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*
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*/
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#ifndef __I2C_MC34704_H
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#define __I2C_MC34704_H
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struct mc34704 {
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struct cdev cdev;
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struct i2c_client *client;
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};
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extern struct mc34704 *mc34704_get(void);
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extern int mc34704_reg_read(struct mc34704 *mc34704, u8 reg, u8 *val);
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extern int mc34704_reg_write(struct mc34704 *mc34704, u8 reg, u8 val);
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#endif /* __I2C_MC34704_H */
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