[PATCH v7] mfd: MAX6650/6651 support

Laszlo Papp
2014-02-12T07:09:56Z

MAX6650/MAX6651 chip is a multi-function device with I2C busses. The
chip includes fan-speed regulators and monitors, GPIO, and alarm.

This patch is an initial release of a MAX6650/6651 MFD driver that
supports to enable the chip with its primary I2C bus that will connect
the hwmon, and then the gpio devices for now.

Signed-off-by: Laszlo Papp <lpapp@kde.org>
---
drivers/mfd/Kconfig | 11 +++++
drivers/mfd/Makefile | 1 +
drivers/mfd/max665x.c | 93 +++++++++++++++++++++++++++++++++++++
include/linux/mfd/max665x-private.h | 34 ++++++++++++++
4 files changed, 139 insertions(+)
create mode 100644 drivers/mfd/max665x.c
create mode 100644 include/linux/mfd/max665x-private.h

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 49bb445..a6c3152 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -368,6 +368,17 @@ config MFD_MAX8907
accessing the device; additional drivers must be enabled in order
to use the functionality of the device.

+config MFD_MAX665X
+ bool "Maxim Semiconductor MAX6650/MAX6651 Support"
+ depends on I2C
+ select MFD_CORE
+ select REGMAP_I2C
+ help
+ Say yes here to add support for Maxim Semiconductor MAX6650/MAX6651. This
+ is a fan speed regulator and monitor IC. This driver provides common
+ support for accessing the device, additional drivers must be enabled in
+ order to use the functionality of the device.
+
config MFD_MAX8925
bool "Maxim Semiconductor MAX8925 PMIC Support"
depends on I2C=y
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 5aea5ef..63668c5 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -111,6 +111,7 @@ obj-$(CONFIG_MFD_DA9055) += da9055.o
da9063-objs := da9063-core.o da9063-irq.o da9063-i2c.o
obj-$(CONFIG_MFD_DA9063) += da9063.o

+obj-$(CONFIG_MFD_MAX665X) += max665x.o
obj-$(CONFIG_MFD_MAX14577) += max14577.o
obj-$(CONFIG_MFD_MAX77686) += max77686.o max77686-irq.o
obj-$(CONFIG_MFD_MAX77693) += max77693.o max77693-irq.o
diff --git a/drivers/mfd/max665x.c b/drivers/mfd/max665x.c
new file mode 100644
index 0000000..54fdc11
--- /dev/null
+++ b/drivers/mfd/max665x.c
@@ -0,0 +1,93 @@
+/*
+ * Device access for MAX6650-MAX6651
+ *
+ * Copyright(c) 2013 Polatis Ltd.
+ *
+ * Author: Laszlo Papp <laszlo.papp@polatis.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ */
+
+#include <linux/device.h>
+#include <linux/mfd/core.h>
+#include <linux/module.h>
+#include <linux/i2c.h>
+
+#include <linux/mfd/max665x-private.h>
+
+static struct mfd_cell max665x_devs[] = {
+ { .name = "max6651-gpio", },
+ { .name = "max6650", }, /* hwmon driver */
+ {},
+};
+
+static const struct regmap_config max665x_regmap_config = {
+ .reg_bits = 5,
+};
+
+static int max665x_probe(struct i2c_client *i2c,
+ const struct i2c_device_id *id)
+{
+ struct max665x_dev *max665x;
+ int ret;
+
+ max665x = devm_kzalloc(&i2c->dev, sizeof(*max665x), GFP_KERNEL);
+ if (!max665x)
+ return -ENOMEM;
+
+ i2c_set_clientdata(i2c, max665x);
+ max665x->dev = &i2c->dev;
+ max665x->i2c = i2c;
+ max665x->map = devm_regmap_init_i2c(i2c, &max665x_regmap_config);
+ if (IS_ERR(max665x->map)) {
+ ret = PTR_ERR(max665x->map);
+ dev_err(max665x->dev, "Failed to allocate register map: %d\n",
+ ret);
+ return ret;
+ }
+
+ mutex_init(&max665x->iolock);
+
+ ret = mfd_add_devices(max665x->dev, -1, max665x_devs,
+ ARRAY_SIZE(max665x_devs),
+ NULL, 0, NULL);
+
+ if (ret < 0)
+ dev_err(max665x->dev, "failed to register child devices\n");
+
+ return ret;
+}
+
+static int max665x_remove(struct i2c_client *i2c)
+{
+ struct max665x_dev *max665x = i2c_get_clientdata(i2c);
+
+ mfd_remove_devices(max665x->dev);
+
+ return 0;
+}
+
+static struct of_device_id max665x_dt_match[] = {
+ { .compatible = "maxim,max665x" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, max665x_dt_match);
+
+static struct i2c_driver max665x_driver = {
+ .driver = {
+ .name = "max665x",
+ .owner = THIS_MODULE,
+ .of_match_table = max665x_dt_match,
+ },
+ .probe = max665x_probe,
+ .remove = max665x_remove,
+};
+
+module_i2c_driver(max665x_driver);
+
+MODULE_AUTHOR("Laszlo Papp <laszlo.papp@polatis.com>");
+MODULE_DESCRIPTION("MAX6650-MAX6651 MFD");
+MODULE_LICENSE("GPL");
diff --git a/include/linux/mfd/max665x-private.h b/include/linux/mfd/max665x-private.h
new file mode 100644
index 0000000..293db4b
--- /dev/null
+++ b/include/linux/mfd/max665x-private.h
@@ -0,0 +1,34 @@
+/*
+ * max665x-private.h - Driver for the Maxim 6650/6651
+ *
+ * Copyright 2013 Polatis Ltd.
+ *
+ * Author: Laszlo Papp <laszlo.papp@polatis.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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.
+ *
+ */
+
+#ifndef __LINUX_MFD_MAX665X_PRIVATE_H
+#define __LINUX_MFD_MAX665X_PRIVATE_H
+
+#include <linux/i2c.h>
+#include <linux/regmap.h>
+
+struct max665x_dev {
+ struct device *dev;
+ struct mutex iolock;
+ struct i2c_client *i2c;
+ struct regmap *map;
+ int type;
+};
+
+#endif
--
1.8.5.4