/* * ADLX345/346 Three-Axis Digital Accelerometers (SPI Interface) * * Enter bugs at http://blackfin.uclinux.org/ * * Copyright (C) 2009 Michael Hennerich, Analog Devices Inc. * Licensed under the GPL-2 or later. */ #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 __devinit 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 int __devexit adxl34x_spi_remove(struct spi_device *spi) { struct adxl34x *ac = dev_get_drvdata(&spi->dev); return adxl34x_remove(ac); } #ifdef CONFIG_PM static int adxl34x_spi_suspend(struct device *dev) { struct spi_device *spi = to_spi_device(dev); struct adxl34x *ac = dev_get_drvdata(&spi->dev); adxl34x_suspend(ac); return 0; } static int adxl34x_spi_resume(struct device *dev) { struct spi_device *spi = to_spi_device(dev); struct adxl34x *ac = dev_get_drvdata(&spi->dev); adxl34x_resume(ac); return 0; } #endif static SIMPLE_DEV_PM_OPS(adxl34x_spi_pm, adxl34x_spi_suspend, adxl34x_spi_resume); static struct spi_driver adxl34x_driver = { .driver = { .name = "adxl34x", .owner = THIS_MODULE, .pm = &adxl34x_spi_pm, }, .probe = adxl34x_spi_probe, .remove = __devexit_p(adxl34x_spi_remove), }; static int __init adxl34x_spi_init(void) { return spi_register_driver(&adxl34x_driver); } module_init(adxl34x_spi_init); static void __exit adxl34x_spi_exit(void) { spi_unregister_driver(&adxl34x_driver); } module_exit(adxl34x_spi_exit); MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>"); MODULE_DESCRIPTION("ADXL345/346 Three-Axis Digital Accelerometer SPI Bus Driver"); MODULE_LICENSE("GPL");