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 <aaro.koskinen@xxxxxx>
Cc: sameo@xxxxxxxxxxxxxxx
---
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
+ (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;
+}
+
+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 <aaro.koskinen@xxxxxx>");
+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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