On Wed, Aug 29, 2012 at 12:34:24AM +0300, Aaro Koskinen wrote: > Retu is a multi-function device found on Nokia Internet Tablets > implementing at least watchdog, RTC, headset detection and power button > functionality. > > This patch implements a minimum functionality providing only register > access functions. > > Signed-off-by: Aaro Koskinen <[email protected]> > Cc: [email protected] > --- > drivers/mfd/Kconfig | 8 +++ > drivers/mfd/Makefile | 1 + > drivers/mfd/retu-mfd.c | 114 > ++++++++++++++++++++++++++++++++++++++++++++++ > include/linux/mfd/retu.h | 20 ++++++++ > 4 files changed, 143 insertions(+), 0 deletions(-) > create mode 100644 drivers/mfd/retu-mfd.c > create mode 100644 include/linux/mfd/retu.h > > diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig > index b1a1462..8ca1270 100644 > --- a/drivers/mfd/Kconfig > +++ b/drivers/mfd/Kconfig > @@ -1003,6 +1003,14 @@ config MFD_PALMAS > If you say yes here you get support for the Palmas > series of PMIC chips from Texas Instruments. > > +config MFD_RETU > + tristate "Support for Retu multi-function device" > + select MFD_CORE > + depends on I2C > + help > + Retu is a multi-function device found on Nokia Internet Tables ^^^^^^ tablets
> + (770, N800 and N810).
> +
> endmenu
> endif
>
> diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
> index 79dd22d..962ec9d 100644
> --- a/drivers/mfd/Makefile
> +++ b/drivers/mfd/Makefile
> @@ -132,3 +132,4 @@ obj-$(CONFIG_MFD_RC5T583) += rc5t583.o rc5t583-irq.o
> obj-$(CONFIG_MFD_SEC_CORE) += sec-core.o sec-irq.o
> obj-$(CONFIG_MFD_ANATOP) += anatop-mfd.o
> obj-$(CONFIG_MFD_LM3533) += lm3533-core.o lm3533-ctrlbank.o
> +obj-$(CONFIG_MFD_RETU) += retu-mfd.o
> diff --git a/drivers/mfd/retu-mfd.c b/drivers/mfd/retu-mfd.c
> new file mode 100644
> index 0000000..f0097d7
> --- /dev/null
> +++ b/drivers/mfd/retu-mfd.c
> @@ -0,0 +1,114 @@
> +/*
> + * Retu MFD driver
> + *
> + * Copyright (C) 2004, 2005 Nokia Corporation
> + *
> + * Based on code written by Juha Yrjölä, David Weinehall and Mikko Ylinen.
> + * Rewritten to MFD/I2C driver by Aaro Koskinen.
> + *
> + * This file is subject to the terms and conditions of the GNU General
> + * Public License. See the file "COPYING" in the main directory of this
> + * archive for more details.
> + *
> + * 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.
> + */
> +
> +#include <linux/err.h>
> +#include <linux/i2c.h>
> +#include <linux/init.h>
> +#include <linux/slab.h>
> +#include <linux/mutex.h>
> +#include <linux/module.h>
> +#include <linux/mfd/core.h>
> +#include <linux/mfd/retu.h>
> +#include <linux/moduleparam.h>
> +
> +/* Registers */
> +#define RETU_REG_ASICR 0x00 /* ASIC ID and revision
> */
> +#define RETU_REG_ASICR_VILMA (1 << 7) /* Bit indicating Vilma */
> +
> +static struct mfd_cell retu_devs[] = {
> + { .name = "retu-wdt" },
> +};
> +
> +int retu_read(struct retu_dev *rdev, u8 reg)
> +{
> + return i2c_smbus_read_word_data(rdev->i2c, reg);
> +}
> +EXPORT_SYMBOL_GPL(retu_read);
> +
> +int retu_write(struct retu_dev *rdev, u8 reg, u16 data)
> +{
> + return i2c_smbus_write_word_data(rdev->i2c, reg, data);
> +}
> +EXPORT_SYMBOL_GPL(retu_write);
> +
> +static int __devinit retu_probe(struct i2c_client *i2c,
> + const struct i2c_device_id *id)
> +{
> + struct retu_dev *rdev;
> + int ret;
> +
> + rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
> + if (rdev == NULL)
> + return -ENOMEM;
> +
> + i2c_set_clientdata(i2c, rdev);
> + rdev->dev = &i2c->dev;
> + rdev->i2c = i2c;
> +
> + ret = retu_read(rdev, RETU_REG_ASICR);
> + if (ret < 0) {
> + dev_err(rdev->dev, "could not read Retu revision: %d\n", ret);
> + return -EIO;
> + }
> +
> + dev_info(rdev->dev, "Retu%s v%d.%d found\n",
> + (ret & RETU_REG_ASICR_VILMA) ? " & Vilma" : "",
> + (ret >> 4) & 0x7, ret & 0xf);
> +
> + ret = mfd_add_devices(rdev->dev, -1, retu_devs, ARRAY_SIZE(retu_devs),
> + NULL, 0);
> + if (ret < 0)
> + goto error;
> +
> + return ret;
> +
> +error:
> + kfree(rdev);
> + return ret;
> +}
looks like this misses the entire irq_chip... maybe on later patches (?)
> +static int __devexit retu_remove(struct i2c_client *i2c)
> +{
> + struct retu_dev *rdev = i2c_get_clientdata(i2c);
> +
> + mfd_remove_devices(rdev->dev);
> + kfree(rdev);
> +
> + return 0;
> +}
> +
> +static const struct i2c_device_id retu_id[] = {
> + { "retu-mfd", 0 },
> + { }
> +};
> +MODULE_DEVICE_TABLE(i2c, retu_id);
> +
> +static struct i2c_driver retu_driver = {
> + .driver = {
> + .name = "retu-mfd",
> + .owner = THIS_MODULE,
> + },
> + .probe = retu_probe,
> + .remove = retu_remove,
> + .id_table = retu_id,
> +};
> +module_i2c_driver(retu_driver);
> +
> +MODULE_DESCRIPTION("Retu MFD driver");
> +MODULE_AUTHOR("Aaro Koskinen <[email protected]>");
> +MODULE_LICENSE("GPL");
> diff --git a/include/linux/mfd/retu.h b/include/linux/mfd/retu.h
> new file mode 100644
> index 0000000..e1b3600
> --- /dev/null
> +++ b/include/linux/mfd/retu.h
> @@ -0,0 +1,20 @@
> +/*
> + * Retu MFD driver interface
> + *
> + * This file is subject to the terms and conditions of the GNU General
> + * Public License. See the file "COPYING" in the main directory of this
> + * archive for more details.
> + */
> +
> +#ifndef __LINUX_MFD_RETU_H
> +#define __LINUX_MFD_RETU_H
> +
> +struct retu_dev {
> + struct device *dev;
> + struct i2c_client *i2c;
> +};
> +
> +int retu_read(struct retu_dev *, u8);
> +int retu_write(struct retu_dev *, u8, u16);
> +
> +#endif /* __LINUX_MFD_RETU_H */
> --
> 1.7.2.5
>
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