137 lines
3.1 KiB
C
137 lines
3.1 KiB
C
/*
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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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* Licensed under the GPL-2 or later.
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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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#ifdef CONFIG_PM_SLEEP
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static int 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 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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#endif
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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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.owner = THIS_MODULE,
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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 <hennerich@blackfin.uclinux.org>");
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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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