Re: [PATCH v4 (staging-next) 2/5] staging:iio:hmc5843: Split hmc5843.c to multiple files

[Jonathan Cameron]

On 20/07/14 17:32, Jonathan Cameron wrote:
> On 16/07/14 14:07, Josef Gajdusek wrote:
> > This patch splits hmc5843.c to multiple files - the interface-agnostic
> > hmc5843_core.c, i2c specific hmc5843_i2c.c and header file hmc5843.h. This is
> > another step to add support of SPI-enabled hmc5983.
> >
> > Signed-off-by: Josef Gajdusek <atx@xxxxxxxx>
> Unfortunately taking the tables non static just causes sparse to complain:
>
> drivers/staging/iio/magnetometer/hmc5843.h:62:28: warning: symbol 'hmc5843_readable_table' was not declared. Should it be static?
> drivers/staging/iio/magnetometer/hmc5843.h:71:28: warning: symbol 'hmc5843_writable_table' was not declared. Should it be static?
> drivers/staging/iio/magnetometer/hmc5843.h:80:28: warning: symbol 'hmc5843_volatile_table' was not declared. Should it be static?
>    CC [M]  drivers/staging/iio/magnetometer/hmc5843_core.o
>    CHECK   drivers/staging/iio/magnetometer/hmc5843_i2c.c
> drivers/staging/iio/magnetometer/hmc5843.h:62:28: warning: symbol 'hmc5843_readable_table' was not declared. Should it be static?
> drivers/staging/iio/magnetometer/hmc5843.h:71:28: warning: symbol 'hmc5843_writable_table' was not declared. Should it be static?
> drivers/staging/iio/magnetometer/hmc5843.h:80:28: warning: symbol 'hmc5843_volatile_table' was not declared. Should it be static?
>    CC [M]  drivers/staging/iio/magnetometer/hmc5843_i2c.o
>
> I think you'll probably just have to duplicate them (which is irritating, but there we are).
>
> Jonathan
p.s. For now I've backed out patch 1 as well so that we can keep this as a
clean series rather than splitting it through time!
> > ---
> >   drivers/staging/iio/magnetometer/Kconfig           |  14 +-
> >   drivers/staging/iio/magnetometer/Makefile          |   3 +-
> >   drivers/staging/iio/magnetometer/hmc5843.h         |  85 ++++++++++++
> >   .../iio/magnetometer/{hmc5843.c => hmc5843_core.c} | 154 +++++----------------
> >   drivers/staging/iio/magnetometer/hmc5843_i2c.c     |  75 ++++++++++
> >   5 files changed, 203 insertions(+), 128 deletions(-)
> >   create mode 100644 drivers/staging/iio/magnetometer/hmc5843.h
> >   rename drivers/staging/iio/magnetometer/{hmc5843.c => hmc5843_core.c} (79%)
> >   create mode 100644 drivers/staging/iio/magnetometer/hmc5843_i2c.c
> >
> > diff --git a/drivers/staging/iio/magnetometer/Kconfig b/drivers/staging/iio/magnetometer/Kconfig
> > index ad88d61..0a27f98 100644
> > --- a/drivers/staging/iio/magnetometer/Kconfig
> > +++ b/drivers/staging/iio/magnetometer/Kconfig
> > @@ -4,16 +4,22 @@
> >   menu "Magnetometer sensors"
> >
> >   config SENSORS_HMC5843
> > -    tristate "Honeywell HMC5843/5883/5883L 3-Axis Magnetometer"
> > -    depends on I2C
> > +    tristate
> >       select IIO_BUFFER
> >       select IIO_TRIGGERED_BUFFER
> > +
> > +config SENSORS_HMC5843_I2C
> > +    tristate "Honeywell HMC5843/5883/5883L 3-Axis Magnetometer (I2C)"
> > +    depends on I2C
> > +    select SENSORS_HMC5843
> >       select REGMAP_I2C
> >       help
> >         Say Y here to add support for the Honeywell HMC5843, HMC5883 and
> >         HMC5883L 3-Axis Magnetometer (digital compass).
> >
> > -      To compile this driver as a module, choose M here: the module
> > -      will be called hmc5843.
> > +      This driver can also be compiled as a set of modules.
> > +      If so, these modules will be created:
> > +      - hmc5843_core (core functions)
> > +      - hmc5843_i2c (support for HMC5843, HMC5883 and HMC5883L)
> >
> >   endmenu
> > diff --git a/drivers/staging/iio/magnetometer/Makefile b/drivers/staging/iio/magnetometer/Makefile
> > index f9bfb2e..65baf1c 100644
> > --- a/drivers/staging/iio/magnetometer/Makefile
> > +++ b/drivers/staging/iio/magnetometer/Makefile
> > @@ -2,4 +2,5 @@
> >   # Makefile for industrial I/O Magnetometer sensors
> >   #
> >
> > -obj-$(CONFIG_SENSORS_HMC5843)    += hmc5843.o
> > +obj-$(CONFIG_SENSORS_HMC5843)        += hmc5843_core.o
> > +obj-$(CONFIG_SENSORS_HMC5843_I2C)    += hmc5843_i2c.o
> > diff --git a/drivers/staging/iio/magnetometer/hmc5843.h b/drivers/staging/iio/magnetometer/hmc5843.h
> > new file mode 100644
> > index 0000000..0d9b02e
> > --- /dev/null
> > +++ b/drivers/staging/iio/magnetometer/hmc5843.h
> > @@ -0,0 +1,85 @@
> > +/*
> > + * Header file for hmc5843 driver
> > + *
> > + * Split from hmc5843.c
> > + * Copyright (C) Josef Gajdusek <atx@xxxxxxxx>
> > + *
> > + * This program is free software; you can redistribute it and/or modify
> > + * it under the terms of the GNU General Public License version 2 as
> > + * published by the Free Software Foundation.
> > + *
> > + * */
> > +
> > +
> > +#ifndef HMC5843_CORE_H
> > +#define HMC5843_CORE_H
> > +
> > +#include <linux/regmap.h>
> > +#include <linux/iio/iio.h>
> > +
> > +#define HMC5843_CONFIG_REG_A            0x00
> > +#define HMC5843_CONFIG_REG_B            0x01
> > +#define HMC5843_MODE_REG            0x02
> > +#define HMC5843_DATA_OUT_MSB_REGS        0x03
> > +#define HMC5843_STATUS_REG            0x09
> > +#define HMC5843_ID_REG                0x0a
> > +#define HMC5843_ID_END                0x0c
> > +
> > +enum hmc5843_ids {
> > +    HMC5843_ID,
> > +    HMC5883_ID,
> > +    HMC5883L_ID,
> > +};
> > +
> > +struct hmc5843_data {
> > +    struct device *dev;
> > +    struct mutex lock;
> > +    struct regmap *regmap;
> > +    const struct hmc5843_chip_info *variant;
> > +    __be16 buffer[8]; /* 3x 16-bit channels + padding + 64-bit timestamp */
> > +};
> > +
> > +int hmc5843_common_probe(struct device *dev, struct regmap *regmap,
> > +        enum hmc5843_ids id);
> > +int hmc5843_common_remove(struct device *dev);
> > +
> > +int hmc5843_common_suspend(struct device *dev);
> > +int hmc5843_common_resume(struct device *dev);
> > +
> > +#ifdef CONFIG_PM_SLEEP
> > +static SIMPLE_DEV_PM_OPS(hmc5843_pm_ops,
> > +        hmc5843_common_suspend,
> > +        hmc5843_common_resume);
> > +#define HMC5843_PM_OPS (&hmc5843_pm_ops)
> > +#else
> > +#define HMC5843_PM_OPS NULL
> > +#endif
> > +
> > +static const struct regmap_range hmc5843_readable_ranges[] = {
> > +        regmap_reg_range(0, HMC5843_ID_END),
> > +};
> > +
> > +struct regmap_access_table hmc5843_readable_table = {
> > +        .yes_ranges = hmc5843_readable_ranges,
> > +        .n_yes_ranges = ARRAY_SIZE(hmc5843_readable_ranges),
> > +};
> > +
> > +static const struct regmap_range hmc5843_writable_ranges[] = {
> > +        regmap_reg_range(0, HMC5843_MODE_REG),
> > +};
> > +
> > +struct regmap_access_table hmc5843_writable_table = {
> > +        .yes_ranges = hmc5843_writable_ranges,
> > +        .n_yes_ranges = ARRAY_SIZE(hmc5843_writable_ranges),
> > +};
> > +
> > +static const struct regmap_range hmc5843_volatile_ranges[] = {
> > +        regmap_reg_range(HMC5843_DATA_OUT_MSB_REGS, HMC5843_STATUS_REG),
> > +};
> > +
> > +struct regmap_access_table hmc5843_volatile_table = {
> > +        .yes_ranges = hmc5843_volatile_ranges,
> > +        .n_yes_ranges = ARRAY_SIZE(hmc5843_volatile_ranges),
> > +};
> > +
> > +#endif /* HMC5843_CORE_H */
> > diff --git a/drivers/staging/iio/magnetometer/hmc5843.c b/drivers/staging/iio/magnetometer/hmc5843_core.c
> > similarity index 79%
> > rename from drivers/staging/iio/magnetometer/hmc5843.c
> > rename to drivers/staging/iio/magnetometer/hmc5843_core.c
> > index 6f06f98..bdeaf43 100644
> > --- a/drivers/staging/iio/magnetometer/hmc5843.c
> > +++ b/drivers/staging/iio/magnetometer/hmc5843_core.c
> > @@ -4,6 +4,8 @@
> >
> >       Support for HMC5883 and HMC5883L by Peter Meerwald <pmeerw@xxxxxxxxxx>.
> >
> > +    Split to multiple files by Josef Gajdusek <atx@xxxxxxxx> - 2014
> > +
> >       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
> > @@ -20,7 +22,6 @@
> >   */
> >
> >   #include <linux/module.h>
> > -#include <linux/i2c.h>
> >   #include <linux/regmap.h>
> >   #include <linux/iio/iio.h>
> >   #include <linux/iio/sysfs.h>
> > @@ -29,19 +30,7 @@
> >   #include <linux/iio/triggered_buffer.h>
> >   #include <linux/delay.h>
> >
> > -#define HMC5843_CONFIG_REG_A            0x00
> > -#define HMC5843_CONFIG_REG_B            0x01
> > -#define HMC5843_MODE_REG            0x02
> > -#define HMC5843_DATA_OUT_MSB_REGS        0x03
> > -#define HMC5843_STATUS_REG            0x09
> > -#define HMC5843_ID_REG                0x0a
> > -#define HMC5843_ID_END                0x0c
> > -
> > -enum hmc5843_ids {
> > -    HMC5843_ID,
> > -    HMC5883_ID,
> > -    HMC5883L_ID,
> > -};
> > +#include "hmc5843.h"
> >
> >   /*
> >    * Range gain settings in (+-)Ga
> > @@ -121,15 +110,6 @@ struct hmc5843_chip_info {
> >       const int *regval_to_nanoscale;
> >   };
> >
> > -/* Each client has this additional data */
> > -struct hmc5843_data {
> > -    struct i2c_client *client;
> > -    struct mutex lock;
> > -    struct regmap *regmap;
> > -    const struct hmc5843_chip_info *variant;
> > -    __be16 buffer[8]; /* 3x 16-bit channels + padding + 64-bit timestamp */
> > -};
> > -
> >   /* The lower two bits contain the current conversion mode */
> >   static s32 hmc5843_set_mode(struct hmc5843_data *data, u8 operating_mode)
> >   {
> > @@ -159,7 +139,7 @@ static int hmc5843_wait_measurement(struct hmc5843_data *data)
> >       }
> >
> >       if (tries < 0) {
> > -        dev_err(&data->client->dev, "data not ready\n");
> > +        dev_err(data->dev, "data not ready\n");
> >           return -EIO;
> >       }
> >
> > @@ -524,7 +504,7 @@ static int hmc5843_init(struct hmc5843_data *data)
> >       if (ret < 0)
> >           return ret;
> >       if (id[0] != 'H' || id[1] != '4' || id[2] != '3') {
> > -        dev_err(&data->client->dev, "no HMC5843/5883/5883L sensor\n");
> > +        dev_err(data->dev, "no HMC5843/5883/5883L sensor\n");
> >           return -ENODEV;
> >       }
> >
> > @@ -550,66 +530,43 @@ static const struct iio_info hmc5843_info = {
> >
> >   static const unsigned long hmc5843_scan_masks[] = {0x7, 0};
> >
> > -static const struct regmap_range hmc5843_readable_ranges[] = {
> > -        regmap_reg_range(0, HMC5843_ID_END),
> > -};
> > -
> > -static struct regmap_access_table hmc5843_readable_table = {
> > -        .yes_ranges = hmc5843_readable_ranges,
> > -        .n_yes_ranges = ARRAY_SIZE(hmc5843_readable_ranges),
> > -};
> >
> > -static const struct regmap_range hmc5843_writable_ranges[] = {
> > -        regmap_reg_range(0, HMC5843_MODE_REG),
> > -};
> > -
> > -static struct regmap_access_table hmc5843_writable_table = {
> > -        .yes_ranges = hmc5843_writable_ranges,
> > -        .n_yes_ranges = ARRAY_SIZE(hmc5843_writable_ranges),
> > -};
> > -
> > -static const struct regmap_range hmc5843_volatile_ranges[] = {
> > -        regmap_reg_range(HMC5843_DATA_OUT_MSB_REGS, HMC5843_STATUS_REG),
> > -};
> > -
> > -static struct regmap_access_table hmc5843_volatile_table = {
> > -        .yes_ranges = hmc5843_volatile_ranges,
> > -        .n_yes_ranges = ARRAY_SIZE(hmc5843_volatile_ranges),
> > -};
> > -
> > -static struct regmap_config hmc5843_regmap_config = {
> > -        .reg_bits = 8,
> > -        .val_bits = 8,
> > -
> > -        .rd_table = &hmc5843_readable_table,
> > -        .wr_table = &hmc5843_writable_table,
> > -        .volatile_table = &hmc5843_volatile_table,
> > +int hmc5843_common_suspend(struct device *dev)
> > +{
> > +    return hmc5843_set_mode(iio_priv(dev_get_drvdata(dev)),
> > +            HMC5843_MODE_CONVERSION_CONTINUOUS);
> > +}
> > +EXPORT_SYMBOL(hmc5843_common_suspend);
> >
> > -        .cache_type = REGCACHE_RBTREE,
> > -};
> > +int hmc5843_common_resume(struct device *dev)
> > +{
> > +    return hmc5843_set_mode(iio_priv(dev_get_drvdata(dev)),
> > +            HMC5843_MODE_SLEEP);
> > +}
> > +EXPORT_SYMBOL(hmc5843_common_resume);
> >
> > -static int hmc5843_probe(struct i2c_client *client,
> > -             const struct i2c_device_id *id)
> > +int hmc5843_common_probe(struct device *dev, struct regmap *regmap,
> > +        enum hmc5843_ids id)
> >   {
> >       struct hmc5843_data *data;
> >       struct iio_dev *indio_dev;
> >       int ret;
> >
> > -    indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
> > +    indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
> >       if (indio_dev == NULL)
> >           return -ENOMEM;
> >
> > +    dev_set_drvdata(dev, indio_dev);
> > +
> >       /* default settings at probe */
> >       data = iio_priv(indio_dev);
> > -    data->client = client;
> > -    data->variant = &hmc5843_chip_info_tbl[id->driver_data];
> > -    data->regmap = devm_regmap_init_i2c(client, &hmc5843_regmap_config);
> > +    data->dev = dev;
> > +    data->regmap = regmap;
> > +    data->variant = &hmc5843_chip_info_tbl[id];
> >       mutex_init(&data->lock);
> >
> > -    i2c_set_clientdata(client, indio_dev);
> > +    indio_dev->dev.parent = dev;
> >       indio_dev->info = &hmc5843_info;
> > -    indio_dev->name = id->name;
> > -    indio_dev->dev.parent = &client->dev;
> >       indio_dev->modes = INDIO_DIRECT_MODE;
> >       indio_dev->channels = data->variant->channels;
> >       indio_dev->num_channels = 4;
> > @@ -634,10 +591,11 @@ buffer_cleanup:
> >       iio_triggered_buffer_cleanup(indio_dev);
> >       return ret;
> >   }
> > +EXPORT_SYMBOL(hmc5843_common_probe);
> >
> > -static int hmc5843_remove(struct i2c_client *client)
> > +int hmc5843_common_remove(struct device *dev)
> >   {
> > -    struct iio_dev *indio_dev = i2c_get_clientdata(client);
> > +    struct iio_dev *indio_dev = dev_get_drvdata(dev);
> >
> >       iio_device_unregister(indio_dev);
> >       iio_triggered_buffer_cleanup(indio_dev);
> > @@ -647,58 +605,8 @@ static int hmc5843_remove(struct i2c_client *client)
> >
> >       return 0;
> >   }
> > -
> > -#ifdef CONFIG_PM_SLEEP
> > -static int hmc5843_suspend(struct device *dev)
> > -{
> > -    struct hmc5843_data *data = iio_priv(i2c_get_clientdata(
> > -        to_i2c_client(dev)));
> > -
> > -    return hmc5843_set_mode(data, HMC5843_MODE_SLEEP);
> > -}
> > -
> > -static int hmc5843_resume(struct device *dev)
> > -{
> > -    struct hmc5843_data *data = iio_priv(i2c_get_clientdata(
> > -        to_i2c_client(dev)));
> > -
> > -    return hmc5843_set_mode(data, HMC5843_MODE_CONVERSION_CONTINUOUS);
> > -}
> > -
> > -static SIMPLE_DEV_PM_OPS(hmc5843_pm_ops, hmc5843_suspend, hmc5843_resume);
> > -#define HMC5843_PM_OPS (&hmc5843_pm_ops)
> > -#else
> > -#define HMC5843_PM_OPS NULL
> > -#endif
> > -
> > -static const struct i2c_device_id hmc5843_id[] = {
> > -    { "hmc5843", HMC5843_ID },
> > -    { "hmc5883", HMC5883_ID },
> > -    { "hmc5883l", HMC5883L_ID },
> > -    { }
> > -};
> > -MODULE_DEVICE_TABLE(i2c, hmc5843_id);
> > -
> > -static const struct of_device_id hmc5843_of_match[] = {
> > -    { .compatible = "honeywell,hmc5843", .data = (void *)HMC5843_ID },
> > -    { .compatible = "honeywell,hmc5883", .data = (void *)HMC5883_ID },
> > -    { .compatible = "honeywell,hmc5883l", .data = (void *)HMC5883L_ID },
> > -    {}
> > -};
> > -MODULE_DEVICE_TABLE(of, hmc5843_of_match);
> > -
> > -static struct i2c_driver hmc5843_driver = {
> > -    .driver = {
> > -        .name    = "hmc5843",
> > -        .pm    = HMC5843_PM_OPS,
> > -        .of_match_table = hmc5843_of_match,
> > -    },
> > -    .id_table    = hmc5843_id,
> > -    .probe        = hmc5843_probe,
> > -    .remove        = hmc5843_remove,
> > -};
> > -module_i2c_driver(hmc5843_driver);
> > +EXPORT_SYMBOL(hmc5843_common_remove);
> >
> >   MODULE_AUTHOR("Shubhrajyoti Datta <shubhrajyoti@xxxxxx>");
> > -MODULE_DESCRIPTION("HMC5843/5883/5883L driver");
> > +MODULE_DESCRIPTION("HMC5843/5883/5883L core driver");
> >   MODULE_LICENSE("GPL");
> > diff --git a/drivers/staging/iio/magnetometer/hmc5843_i2c.c b/drivers/staging/iio/magnetometer/hmc5843_i2c.c
> > new file mode 100644
> > index 0000000..20b5c93
> > --- /dev/null
> > +++ b/drivers/staging/iio/magnetometer/hmc5843_i2c.c
> > @@ -0,0 +1,75 @@
> > +/*
> > + * i2c driver for hmc5843/5843/5883/5883l
> > + *
> > + * Split from hmc5843.c
> > + * Copyright (C) Josef Gajdusek <atx@xxxxxxxx>
> > + *
> > + * This program is free software; you can redistribute it and/or modify
> > + * it under the terms of the GNU General Public License version 2 as
> > + * published by the Free Software Foundation.
> > + *
> > + * */
> > +
> > +#include <linux/module.h>
> > +#include <linux/i2c.h>
> > +#include <linux/regmap.h>
> > +#include <linux/iio/iio.h>
> > +#include <linux/iio/triggered_buffer.h>
> > +
> > +#include "hmc5843.h"
> > +
> > +static struct regmap_config hmc5843_i2c_regmap_config = {
> > +        .reg_bits = 8,
> > +        .val_bits = 8,
> > +
> > +        .rd_table = &hmc5843_readable_table,
> > +        .wr_table = &hmc5843_writable_table,
> > +        .volatile_table = &hmc5843_volatile_table,
> > +
> > +        .cache_type = REGCACHE_RBTREE,
> > +};
> > +
> > +static int hmc5843_i2c_probe(struct i2c_client *client,
> > +             const struct i2c_device_id *id)
> > +{
> > +    return hmc5843_common_probe(&client->dev,
> > +            devm_regmap_init_i2c(client, &hmc5843_i2c_regmap_config),
> > +            id->driver_data);
> > +}
> > +
> > +static int hmc5843_i2c_remove(struct i2c_client *client)
> > +{
> > +    return hmc5843_common_remove(&client->dev);
> > +}
> > +
> > +static const struct i2c_device_id hmc5843_id[] = {
> > +    { "hmc5843", HMC5843_ID },
> > +    { "hmc5883", HMC5883_ID },
> > +    { "hmc5883l", HMC5883L_ID },
> > +    { }
> > +};
> > +MODULE_DEVICE_TABLE(i2c, hmc5843_id);
> > +
> > +static const struct of_device_id hmc5843_of_match[] = {
> > +    { .compatible = "honeywell,hmc5843", .data = (void *)HMC5843_ID },
> > +    { .compatible = "honeywell,hmc5883", .data = (void *)HMC5883_ID },
> > +    { .compatible = "honeywell,hmc5883l", .data = (void *)HMC5883L_ID },
> > +    {}
> > +};
> > +MODULE_DEVICE_TABLE(of, hmc5843_of_match);
> > +
> > +static struct i2c_driver hmc5843_driver = {
> > +    .driver = {
> > +        .name    = "hmc5843",
> > +        .pm    = HMC5843_PM_OPS,
> > +        .of_match_table = hmc5843_of_match,
> > +    },
> > +    .id_table    = hmc5843_id,
> > +    .probe        = hmc5843_i2c_probe,
> > +    .remove        = hmc5843_i2c_remove,
> > +};
> > +module_i2c_driver(hmc5843_driver);
> > +
> > +MODULE_AUTHOR("Josef Gajdusek <atx@xxxxxxxx>");
> > +MODULE_DESCRIPTION("HMC5843/5883/5883L i2c driver");
> > +MODULE_LICENSE("GPL");
>
> --
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