129 lines
2.5 KiB
C
129 lines
2.5 KiB
C
/*
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* AD7606 SPI ADC driver
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*
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* Copyright 2011 Analog Devices Inc.
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*
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* Licensed under the GPL-2.
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*/
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#include <linux/module.h>
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#include <linux/spi/spi.h>
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#include <linux/types.h>
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#include <linux/err.h>
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#include "../iio.h"
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#include "ad7606.h"
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#define MAX_SPI_FREQ_HZ 23500000 /* VDRIVE above 4.75 V */
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static int ad7606_spi_read_block(struct device *dev,
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int count, void *buf)
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{
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struct spi_device *spi = to_spi_device(dev);
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int i, ret;
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unsigned short *data = buf;
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ret = spi_read(spi, (u8 *)buf, count * 2);
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if (ret < 0) {
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dev_err(&spi->dev, "SPI read error\n");
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return ret;
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}
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for (i = 0; i < count; i++)
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data[i] = be16_to_cpu(data[i]);
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return 0;
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}
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static const struct ad7606_bus_ops ad7606_spi_bops = {
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.read_block = ad7606_spi_read_block,
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};
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static int __devinit ad7606_spi_probe(struct spi_device *spi)
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{
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struct iio_dev *indio_dev;
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indio_dev = ad7606_probe(&spi->dev, spi->irq, NULL,
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spi_get_device_id(spi)->driver_data,
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&ad7606_spi_bops);
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if (IS_ERR(indio_dev))
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return PTR_ERR(indio_dev);
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spi_set_drvdata(spi, indio_dev);
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return 0;
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}
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static int __devexit ad7606_spi_remove(struct spi_device *spi)
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{
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struct iio_dev *indio_dev = dev_get_drvdata(&spi->dev);
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return ad7606_remove(indio_dev);
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}
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#ifdef CONFIG_PM
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static int ad7606_spi_suspend(struct device *dev)
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{
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struct iio_dev *indio_dev = dev_get_drvdata(dev);
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ad7606_suspend(indio_dev);
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return 0;
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}
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static int ad7606_spi_resume(struct device *dev)
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{
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struct iio_dev *indio_dev = dev_get_drvdata(dev);
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ad7606_resume(indio_dev);
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return 0;
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}
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static const struct dev_pm_ops ad7606_pm_ops = {
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.suspend = ad7606_spi_suspend,
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.resume = ad7606_spi_resume,
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};
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#define AD7606_SPI_PM_OPS (&ad7606_pm_ops)
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#else
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#define AD7606_SPI_PM_OPS NULL
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#endif
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static const struct spi_device_id ad7606_id[] = {
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{"ad7606-8", ID_AD7606_8},
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{"ad7606-6", ID_AD7606_6},
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{"ad7606-4", ID_AD7606_4},
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{}
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};
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static struct spi_driver ad7606_driver = {
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.driver = {
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.name = "ad7606",
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.bus = &spi_bus_type,
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.owner = THIS_MODULE,
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.pm = AD7606_SPI_PM_OPS,
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},
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.probe = ad7606_spi_probe,
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.remove = __devexit_p(ad7606_spi_remove),
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.id_table = ad7606_id,
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};
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static int __init ad7606_spi_init(void)
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{
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return spi_register_driver(&ad7606_driver);
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}
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module_init(ad7606_spi_init);
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static void __exit ad7606_spi_exit(void)
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{
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spi_unregister_driver(&ad7606_driver);
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}
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module_exit(ad7606_spi_exit);
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MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
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MODULE_DESCRIPTION("Analog Devices AD7606 ADC");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("spi:ad7606_spi");
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