Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751970AbdCDIdA (ORCPT ); Sat, 4 Mar 2017 03:33:00 -0500 Received: from mail-pf0-f194.google.com ([209.85.192.194]:35607 "EHLO mail-pf0-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750769AbdCDIc6 (ORCPT ); Sat, 4 Mar 2017 03:32:58 -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, robh+dt@kernel.org, mark.rutland@arm.com, devicetree@vger.kernel.org, andy.shevchenko@gmail.com, Eva Rachel Retuya Subject: [PATCH v6 4/4] iio: accel: adxl345: Add SPI support Date: Sat, 4 Mar 2017 16:31:26 +0800 Message-Id: <211e687f6848450067db4c1a294303a40aa66d57.1488615230.git.eraretuya@gmail.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: References: In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4541 Lines: 147 Add SPI driver that initializes 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 Reviewed-by: Andy Shevchenko --- Changes from v5: * Simplify configuration dependency to "depends on INPUT_ADXL34X=n" * Modify header comment: place indication at the beginning * Re-order local variable declarations from longest to shortest line * Remove explicit casting to int in handling devm_regmap_init_spi() error, use %ld instead * Rename functions calls from *_common_* to *_core_* drivers/iio/accel/Kconfig | 14 +++++++ drivers/iio/accel/Makefile | 1 + drivers/iio/accel/adxl345_spi.c | 81 +++++++++++++++++++++++++++++++++++++++++ 3 files changed, 96 insertions(+) create mode 100644 drivers/iio/accel/adxl345_spi.c diff --git a/drivers/iio/accel/Kconfig b/drivers/iio/accel/Kconfig index a725227..15de262 100644 --- a/drivers/iio/accel/Kconfig +++ b/drivers/iio/accel/Kconfig @@ -22,6 +22,20 @@ config ADXL345_I2C will be called adxl345_i2c and you will also get adxl345_core for the core module. +config ADXL345_SPI + tristate "Analog Devices ADXL345 3-Axis Digital Accelerometer SPI Driver" + depends on INPUT_ADXL34X=n + 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 and you will also get adxl345_core + for the core module. + 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..6d65819 --- /dev/null +++ b/drivers/iio/accel/adxl345_spi.c @@ -0,0 +1,81 @@ +/* + * ADXL345 3-Axis Digital Accelerometer SPI driver + * + * 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. + */ + +#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) +{ + const struct spi_device_id *id = spi_get_device_id(spi); + struct regmap *regmap; + + /* 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: %ld\n", + PTR_ERR(regmap)); + return PTR_ERR(regmap); + } + + return adxl345_core_probe(&spi->dev, regmap, id->name); +} + +static int adxl345_spi_remove(struct spi_device *spi) +{ + return adxl345_core_remove(&spi->dev); +} + +static const struct spi_device_id adxl345_spi_id[] = { + { "adxl345", 0 }, + { } +}; + +MODULE_DEVICE_TABLE(spi, adxl345_spi_id); + +static const struct of_device_id adxl345_of_match[] = { + { .compatible = "adi,adxl345" }, + { }, +}; + +MODULE_DEVICE_TABLE(of, adxl345_of_match); + +static struct spi_driver adxl345_spi_driver = { + .driver = { + .name = "adxl345_spi", + .of_match_table = adxl345_of_match, + }, + .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