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Date: Fri, 14 Feb 2014 09:24:34 -0800
From: Guenter Roeck <linux@...ck-us.net>
To: Laszlo Papp <lpapp@....org>
Cc: jdelvare@...e.de, lm-sensors@...sensors.org, lee.jones@...aro.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] mfd: MAX6650/6651 support
On Fri, Feb 14, 2014 at 09:15:41AM +0000, Laszlo Papp wrote:
> 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@....org>
> ---
> drivers/mfd/Kconfig | 11 +++++
> drivers/mfd/Makefile | 1 +
> drivers/mfd/max665x.c | 94 +++++++++++++++++++++++++++++++++++++
> include/linux/mfd/max665x-private.h | 34 ++++++++++++++
> 4 files changed, 140 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..80672d7
> --- /dev/null
> +++ b/drivers/mfd/max665x.c
> @@ -0,0 +1,94 @@
> +/*
> + * Device access for MAX6650-MAX6651
> + *
> + * Copyright(c) 2013 Polatis Ltd.
> + *
> + * Author: Laszlo Papp <laszlo.papp@...atis.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 = 8,
> + .val_bits = 8,
> +};
> +
> +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" },
There was a separate patch to provide actual device types, which I would
suggest to merge with this one.
> + {},
> +};
> +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,
> + },
The 'legacy' means to instantiate i2c devices will need to be supported
for non-DT systems.
> + .probe = max665x_probe,
> + .remove = max665x_remove,
> +};
> +
> +module_i2c_driver(max665x_driver);
> +
> +MODULE_AUTHOR("Laszlo Papp <laszlo.papp@...atis.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@...atis.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;
Unless I am missing something, only map is really used in practice.
Clients should not need anything else except possibly type, which is currently
not initialized or used. dev == &i2c->dev and thus redundant even if one is used.
You'll have to decide for a means to pass the device type (max6650 or max6651)
to the client, either through type, the client driver name, or some other means.
Guenter
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