From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754363AbdBPKDH (ORCPT ); Thu, 16 Feb 2017 05:03:07 -0500 Received: from mail-pg0-f67.google.com ([74.125.83.67]:34573 "EHLO mail-pg0-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754313AbdBPKDE (ORCPT ); Thu, 16 Feb 2017 05:03:04 -0500 From: Eva Rachel Retuya To: jic23@kernel.org, linux-iio@vger.kernel.org Cc: knaack.h@gmx.de, lars@metafoo.de, pmeerw@pmeerw.net, dmitry.torokhov@gmail.com, michael.hennerich@analog.com, daniel.baluta@gmail.com, amsfield22@gmail.com, florian.vaussard@heig-vd.ch, linux-kernel@vger.kernel.org, Eva Rachel Retuya Subject: [PATCH 3/4] iio: accel: adxl345: Add SPI support Date: Thu, 16 Feb 2017 18:02:06 +0800 Message-Id: <1487239327-21406-4-git-send-email-eraretuya@gmail.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1487239327-21406-1-git-send-email-eraretuya@gmail.com> References: <1487239327-21406-1-git-send-email-eraretuya@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add SPI driver for initializing spi regmap for the adxl345 core driver. The driver supports the same functionality as I2C namely the x, y, z and scale readings. Signed-off-by: Eva Rachel Retuya --- drivers/iio/accel/Kconfig | 13 +++++++ drivers/iio/accel/Makefile | 1 + drivers/iio/accel/adxl345_spi.c | 75 +++++++++++++++++++++++++++++++++++++++++ 3 files changed, 89 insertions(+) create mode 100644 drivers/iio/accel/adxl345_spi.c diff --git a/drivers/iio/accel/Kconfig b/drivers/iio/accel/Kconfig index 5bdd87f..d474fed 100644 --- a/drivers/iio/accel/Kconfig +++ b/drivers/iio/accel/Kconfig @@ -21,6 +21,19 @@ config ADXL345_I2C To compile this driver as a module, choose M here: the module will be called adxl345_i2c. +config ADXL345_SPI + tristate "Analog Devices ADXL345 3-Axis Digital Accelerometer SPI Driver" + depends on !(INPUT_ADXL34X=y || INPUT_ADXL34X=m) + depends on SPI + select ADXL345 + select REGMAP_SPI + help + Say Y here if you want to build support for the Analog Devices + ADXL345 3-axis digital accelerometer. + + To compile this driver as a module, choose M here: the + module will be called adxl345_spi. + config BMA180 tristate "Bosch BMA180/BMA250 3-Axis Accelerometer Driver" depends on I2C diff --git a/drivers/iio/accel/Makefile b/drivers/iio/accel/Makefile index 3f4a6d6..31fba19 100644 --- a/drivers/iio/accel/Makefile +++ b/drivers/iio/accel/Makefile @@ -5,6 +5,7 @@ # When adding new entries keep the list in alphabetical order obj-$(CONFIG_ADXL345) += adxl345_core.o obj-$(CONFIG_ADXL345_I2C) += adxl345_i2c.o +obj-$(CONFIG_ADXL345_SPI) += adxl345_spi.o obj-$(CONFIG_BMA180) += bma180.o obj-$(CONFIG_BMA220) += bma220_spi.o obj-$(CONFIG_BMC150_ACCEL) += bmc150-accel-core.o diff --git a/drivers/iio/accel/adxl345_spi.c b/drivers/iio/accel/adxl345_spi.c new file mode 100644 index 0000000..5fcd1fa --- /dev/null +++ b/drivers/iio/accel/adxl345_spi.c @@ -0,0 +1,75 @@ +/* + * ADXL345 3-Axis Digital Accelerometer + * + * Copyright (c) 2017 Eva Rachel Retuya + * + * This file is subject to the terms and conditions of version 2 of + * the GNU General Public License. See the file COPYING in the main + * directory of this archive for more details. + * + * SPI driver for ADXL345 + */ + +#include +#include +#include + +#include "adxl345.h" + +#define ADXL345_MAX_SPI_FREQ_HZ 5000000 + +static const struct regmap_config adxl345_spi_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + /* Setting bits 7 and 6 enables multiple-byte read */ + .read_flag_mask = BIT(7) | BIT(6), +}; + +static int adxl345_spi_probe(struct spi_device *spi) +{ + struct regmap *regmap; + const struct spi_device_id *id = spi_get_device_id(spi); + + /* Bail out if max_speed_hz exceeds 5 MHz */ + if (spi->max_speed_hz > ADXL345_MAX_SPI_FREQ_HZ) { + dev_err(&spi->dev, "SPI CLK, %d Hz exceeds 5 MHz\n", + spi->max_speed_hz); + return -EINVAL; + } + + regmap = devm_regmap_init_spi(spi, &adxl345_spi_regmap_config); + if (IS_ERR(regmap)) { + dev_err(&spi->dev, "Error initializing spi regmap: %d\n", + (int)PTR_ERR(regmap)); + return PTR_ERR(regmap); + } + + return adxl345_common_probe(&spi->dev, regmap, id->name); +} + +static int adxl345_spi_remove(struct spi_device *spi) +{ + return adxl345_common_remove(&spi->dev); +} + +static const struct spi_device_id adxl345_spi_id[] = { + { "adxl345", 0 }, + { } +}; + +MODULE_DEVICE_TABLE(spi, adxl345_spi_id); + +static struct spi_driver adxl345_spi_driver = { + .driver = { + .name = "adxl345_spi", + }, + .probe = adxl345_spi_probe, + .remove = adxl345_spi_remove, + .id_table = adxl345_spi_id, +}; + +module_spi_driver(adxl345_spi_driver); + +MODULE_AUTHOR("Eva Rachel Retuya "); +MODULE_DESCRIPTION("ADXL345 3-Axis Digital Accelerometer SPI driver"); +MODULE_LICENSE("GPL v2"); -- 2.7.4