diff options
author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
---|---|---|
committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/input/misc/adxl34x-spi.c | |
parent | Initial commit. (diff) | |
download | linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/input/misc/adxl34x-spi.c')
-rw-r--r-- | drivers/input/misc/adxl34x-spi.c | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/drivers/input/misc/adxl34x-spi.c b/drivers/input/misc/adxl34x-spi.c new file mode 100644 index 000000000..91e44d4c6 --- /dev/null +++ b/drivers/input/misc/adxl34x-spi.c @@ -0,0 +1,133 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * ADLX345/346 Three-Axis Digital Accelerometers (SPI Interface) + * + * Enter bugs at http://blackfin.uclinux.org/ + * + * Copyright (C) 2009 Michael Hennerich, Analog Devices Inc. + */ + +#include <linux/input.h> /* BUS_SPI */ +#include <linux/module.h> +#include <linux/spi/spi.h> +#include <linux/pm.h> +#include <linux/types.h> +#include "adxl34x.h" + +#define MAX_SPI_FREQ_HZ 5000000 +#define MAX_FREQ_NO_FIFODELAY 1500000 +#define ADXL34X_CMD_MULTB (1 << 6) +#define ADXL34X_CMD_READ (1 << 7) +#define ADXL34X_WRITECMD(reg) (reg & 0x3F) +#define ADXL34X_READCMD(reg) (ADXL34X_CMD_READ | (reg & 0x3F)) +#define ADXL34X_READMB_CMD(reg) (ADXL34X_CMD_READ | ADXL34X_CMD_MULTB \ + | (reg & 0x3F)) + +static int adxl34x_spi_read(struct device *dev, unsigned char reg) +{ + struct spi_device *spi = to_spi_device(dev); + unsigned char cmd; + + cmd = ADXL34X_READCMD(reg); + + return spi_w8r8(spi, cmd); +} + +static int adxl34x_spi_write(struct device *dev, + unsigned char reg, unsigned char val) +{ + struct spi_device *spi = to_spi_device(dev); + unsigned char buf[2]; + + buf[0] = ADXL34X_WRITECMD(reg); + buf[1] = val; + + return spi_write(spi, buf, sizeof(buf)); +} + +static int adxl34x_spi_read_block(struct device *dev, + unsigned char reg, int count, + void *buf) +{ + struct spi_device *spi = to_spi_device(dev); + ssize_t status; + + reg = ADXL34X_READMB_CMD(reg); + status = spi_write_then_read(spi, ®, 1, buf, count); + + return (status < 0) ? status : 0; +} + +static const struct adxl34x_bus_ops adxl34x_spi_bops = { + .bustype = BUS_SPI, + .write = adxl34x_spi_write, + .read = adxl34x_spi_read, + .read_block = adxl34x_spi_read_block, +}; + +static int adxl34x_spi_probe(struct spi_device *spi) +{ + struct adxl34x *ac; + + /* don't exceed max specified SPI CLK frequency */ + if (spi->max_speed_hz > MAX_SPI_FREQ_HZ) { + dev_err(&spi->dev, "SPI CLK %d Hz too fast\n", spi->max_speed_hz); + return -EINVAL; + } + + ac = adxl34x_probe(&spi->dev, spi->irq, + spi->max_speed_hz > MAX_FREQ_NO_FIFODELAY, + &adxl34x_spi_bops); + + if (IS_ERR(ac)) + return PTR_ERR(ac); + + spi_set_drvdata(spi, ac); + + return 0; +} + +static void adxl34x_spi_remove(struct spi_device *spi) +{ + struct adxl34x *ac = spi_get_drvdata(spi); + + adxl34x_remove(ac); +} + +static int __maybe_unused adxl34x_spi_suspend(struct device *dev) +{ + struct spi_device *spi = to_spi_device(dev); + struct adxl34x *ac = spi_get_drvdata(spi); + + adxl34x_suspend(ac); + + return 0; +} + +static int __maybe_unused adxl34x_spi_resume(struct device *dev) +{ + struct spi_device *spi = to_spi_device(dev); + struct adxl34x *ac = spi_get_drvdata(spi); + + adxl34x_resume(ac); + + return 0; +} + +static SIMPLE_DEV_PM_OPS(adxl34x_spi_pm, adxl34x_spi_suspend, + adxl34x_spi_resume); + +static struct spi_driver adxl34x_driver = { + .driver = { + .name = "adxl34x", + .pm = &adxl34x_spi_pm, + }, + .probe = adxl34x_spi_probe, + .remove = adxl34x_spi_remove, +}; + +module_spi_driver(adxl34x_driver); + +MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); +MODULE_DESCRIPTION("ADXL345/346 Three-Axis Digital Accelerometer SPI Bus Driver"); +MODULE_LICENSE("GPL"); |