Re: [PATCH 20/20] iio: bmc150: Add SPI driver

[Jonathan Cameron <jic23@kernel.org>]

On 12/08/15 11:12, Markus Pargmann wrote:
> Add a simple SPI driver which initializes the spi regmap for the bmc150
> core driver.
> 
> Signed-off-by: Markus Pargmann <mpa@pengutronix.de>
1 thing inline, plus the change of kconfig approach suggested for the
previous patch.

Otherwise, looks fine to me.

Srinivas, over to you for the next version :) (unless you are feeling
enthusiastic and want to take a look at this one)
> ---
>  drivers/iio/accel/Kconfig            | 10 +++++
>  drivers/iio/accel/Makefile           |  1 +
>  drivers/iio/accel/bmc150-accel-spi.c | 86 ++++++++++++++++++++++++++++++++++++
>  3 files changed, 97 insertions(+)
>  create mode 100644 drivers/iio/accel/bmc150-accel-spi.c
> 
> diff --git a/drivers/iio/accel/Kconfig b/drivers/iio/accel/Kconfig
> index c63e981c38ff..bdb42069a767 100644
> --- a/drivers/iio/accel/Kconfig
> +++ b/drivers/iio/accel/Kconfig
> @@ -40,6 +40,16 @@ config BMC150_ACCEL_I2C
>  	  Say yes here to build support for I2C communication with the
>  	  mentioned accelerometer.
>  
> +config BMC150_ACCEL_SPI
> +	tristate "SPI support"
> +	depends on SPI
> +	select IIO_BUFFER
> +	select IIO_TRIGGERED_BUFFER
> +	select REGMAP_SPI
> +	help
> +	  Say yes here to build support for SPI communication with the
> +	  mentioned accelerometer.
If you move to the config approach I suggested earlier, these options
are hidden away avoiding the need for a help message ;)
> +
>  endif
>  
>  config HID_SENSOR_ACCEL_3D
> diff --git a/drivers/iio/accel/Makefile b/drivers/iio/accel/Makefile
> index 5ef8bdbad092..e579e93bf022 100644
> --- a/drivers/iio/accel/Makefile
> +++ b/drivers/iio/accel/Makefile
> @@ -6,6 +6,7 @@
>  obj-$(CONFIG_BMA180) += bma180.o
>  obj-$(CONFIG_BMC150_ACCEL) += bmc150-accel-core.o
>  obj-$(CONFIG_BMC150_ACCEL_I2C) += bmc150-accel-i2c.o
> +obj-$(CONFIG_BMC150_ACCEL_SPI) += bmc150-accel-spi.o
>  obj-$(CONFIG_HID_SENSOR_ACCEL_3D) += hid-sensor-accel-3d.o
>  obj-$(CONFIG_KXCJK1013) += kxcjk-1013.o
>  obj-$(CONFIG_KXSD9)	+= kxsd9.o
> diff --git a/drivers/iio/accel/bmc150-accel-spi.c b/drivers/iio/accel/bmc150-accel-spi.c
> new file mode 100644
> index 000000000000..c13fd2aa5f34
> --- /dev/null
> +++ b/drivers/iio/accel/bmc150-accel-spi.c
> @@ -0,0 +1,86 @@
> +/*
> + * 3-axis accelerometer driver supporting following I2C Bosch-Sensortec chips:
Umm. Read the line above?  Spot the obvious minor point ;)

> + *  - BMC150
> + *  - BMI055
> + *  - BMA255
> + *  - BMA250E
> + *  - BMA222E
> + *  - BMA280
> + *
> + * Copyright (c) 2014, Intel Corporation.
> + *
> + * This program is free software; you can redistribute it and/or modify it
> + * under the terms and conditions of the GNU General Public License,
> + * version 2, as published by the Free Software Foundation.
> + *
> + * This program is distributed in the hope 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/device.h>
> +#include <linux/mod_devicetable.h>
> +#include <linux/module.h>
> +#include <linux/acpi.h>
> +#include <linux/regmap.h>
> +#include <linux/spi/spi.h>
> +
> +#include "bmc150-accel.h"
> +
> +static const struct regmap_config bmc150_spi_regmap_conf = {
> +	.reg_bits = 8,
> +	.val_bits = 8,
> +	.max_register = 0x3f,
> +
> +	.use_single_rw = false,
> +	.cache_type = REGCACHE_NONE,
> +};
> +
> +static int bmc150_accel_probe(struct spi_device *spi)
> +{
> +	struct regmap *regmap;
> +	const struct spi_device_id *id = spi_get_device_id(spi);
> +
> +	regmap = devm_regmap_init_spi(spi, &bmc150_spi_regmap_conf);
> +	if (IS_ERR(regmap)) {
> +		dev_err(&spi->dev, "Failed to initialize spi regmap\n");
> +		return PTR_ERR(regmap);
> +	}
> +
> +	return bmc150_accel_core_probe(&spi->dev, regmap, spi->irq,
> +				       id->name, id->driver_data, true);
> +}
> +
> +static int bmc150_accel_remove(struct spi_device *spi)
> +{
> +	return bmc150_accel_core_remove(&spi->dev);
> +}
> +
> +static const struct spi_device_id bmc150_accel_id[] = {
> +	{"bmc150_accel",	bmc150},
> +	{"bmi055_accel",	bmi055},
> +	{"bma255",		bma255},
> +	{"bma250e",		bma250e},
> +	{"bma222e",		bma222e},
> +	{"bma280",		bma280},
> +	{}
> +};
> +
> +MODULE_DEVICE_TABLE(spi, bmc150_accel_id);
> +
> +static struct spi_driver bmc150_accel_driver = {
> +	.driver = {
> +		.name	= "bmc150_accel_spi",
> +		.acpi_match_table = ACPI_PTR(bmc150_accel_acpi_match),
> +		.pm	= &bmc150_accel_pm_ops,
> +	},
> +	.probe		= bmc150_accel_probe,
> +	.remove		= bmc150_accel_remove,
> +	.id_table	= bmc150_accel_id,
> +};
> +module_spi_driver(bmc150_accel_driver);
> +
> +MODULE_AUTHOR("Markus Pargmann <mpa@pengutronix.de>");
> +MODULE_LICENSE("GPL v2");
> +MODULE_DESCRIPTION("BMC150 SPI accelerometer driver");
>