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133 lines
3.1 KiB
133 lines
3.1 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* ADLX345/346 Three-Axis Digital Accelerometers (SPI Interface) |
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* |
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* Enter bugs at http://blackfin.uclinux.org/ |
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* |
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* Copyright (C) 2009 Michael Hennerich, Analog Devices Inc. |
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*/ |
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#include <linux/input.h> /* BUS_SPI */ |
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#include <linux/module.h> |
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#include <linux/spi/spi.h> |
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#include <linux/pm.h> |
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#include <linux/types.h> |
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#include "adxl34x.h" |
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#define MAX_SPI_FREQ_HZ 5000000 |
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#define MAX_FREQ_NO_FIFODELAY 1500000 |
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#define ADXL34X_CMD_MULTB (1 << 6) |
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#define ADXL34X_CMD_READ (1 << 7) |
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#define ADXL34X_WRITECMD(reg) (reg & 0x3F) |
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#define ADXL34X_READCMD(reg) (ADXL34X_CMD_READ | (reg & 0x3F)) |
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#define ADXL34X_READMB_CMD(reg) (ADXL34X_CMD_READ | ADXL34X_CMD_MULTB \ |
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| (reg & 0x3F)) |
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static int adxl34x_spi_read(struct device *dev, unsigned char reg) |
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{ |
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struct spi_device *spi = to_spi_device(dev); |
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unsigned char cmd; |
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cmd = ADXL34X_READCMD(reg); |
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return spi_w8r8(spi, cmd); |
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} |
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static int adxl34x_spi_write(struct device *dev, |
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unsigned char reg, unsigned char val) |
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{ |
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struct spi_device *spi = to_spi_device(dev); |
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unsigned char buf[2]; |
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buf[0] = ADXL34X_WRITECMD(reg); |
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buf[1] = val; |
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return spi_write(spi, buf, sizeof(buf)); |
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} |
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static int adxl34x_spi_read_block(struct device *dev, |
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unsigned char reg, int count, |
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void *buf) |
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{ |
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struct spi_device *spi = to_spi_device(dev); |
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ssize_t status; |
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reg = ADXL34X_READMB_CMD(reg); |
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status = spi_write_then_read(spi, ®, 1, buf, count); |
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return (status < 0) ? status : 0; |
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} |
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static const struct adxl34x_bus_ops adxl34x_spi_bops = { |
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.bustype = BUS_SPI, |
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.write = adxl34x_spi_write, |
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.read = adxl34x_spi_read, |
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.read_block = adxl34x_spi_read_block, |
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}; |
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static int adxl34x_spi_probe(struct spi_device *spi) |
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{ |
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struct adxl34x *ac; |
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/* don't exceed max specified SPI CLK frequency */ |
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if (spi->max_speed_hz > MAX_SPI_FREQ_HZ) { |
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dev_err(&spi->dev, "SPI CLK %d Hz too fast\n", spi->max_speed_hz); |
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return -EINVAL; |
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} |
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ac = adxl34x_probe(&spi->dev, spi->irq, |
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spi->max_speed_hz > MAX_FREQ_NO_FIFODELAY, |
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&adxl34x_spi_bops); |
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if (IS_ERR(ac)) |
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return PTR_ERR(ac); |
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spi_set_drvdata(spi, ac); |
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return 0; |
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} |
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static int adxl34x_spi_remove(struct spi_device *spi) |
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{ |
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struct adxl34x *ac = spi_get_drvdata(spi); |
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return adxl34x_remove(ac); |
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} |
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static int __maybe_unused adxl34x_spi_suspend(struct device *dev) |
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{ |
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struct spi_device *spi = to_spi_device(dev); |
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struct adxl34x *ac = spi_get_drvdata(spi); |
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adxl34x_suspend(ac); |
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return 0; |
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} |
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static int __maybe_unused adxl34x_spi_resume(struct device *dev) |
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{ |
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struct spi_device *spi = to_spi_device(dev); |
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struct adxl34x *ac = spi_get_drvdata(spi); |
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adxl34x_resume(ac); |
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return 0; |
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} |
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static SIMPLE_DEV_PM_OPS(adxl34x_spi_pm, adxl34x_spi_suspend, |
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adxl34x_spi_resume); |
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static struct spi_driver adxl34x_driver = { |
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.driver = { |
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.name = "adxl34x", |
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.pm = &adxl34x_spi_pm, |
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}, |
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.probe = adxl34x_spi_probe, |
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.remove = adxl34x_spi_remove, |
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}; |
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module_spi_driver(adxl34x_driver); |
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MODULE_AUTHOR("Michael Hennerich <[email protected]>"); |
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MODULE_DESCRIPTION("ADXL345/346 Three-Axis Digital Accelerometer SPI Bus Driver"); |
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MODULE_LICENSE("GPL");
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