193 lines
3.9 KiB
C
193 lines
3.9 KiB
C
/*
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* AD7606 Parallel Interface 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/platform_device.h>
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#include <linux/types.h>
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#include <linux/err.h>
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#include <linux/io.h>
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#include "../iio.h"
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#include "ad7606.h"
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static int ad7606_par16_read_block(struct device *dev,
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int count, void *buf)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct iio_dev *indio_dev = platform_get_drvdata(pdev);
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struct ad7606_state *st = iio_priv(indio_dev);
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insw((unsigned long) st->base_address, buf, count);
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return 0;
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}
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static const struct ad7606_bus_ops ad7606_par16_bops = {
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.read_block = ad7606_par16_read_block,
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};
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static int ad7606_par8_read_block(struct device *dev,
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int count, void *buf)
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{
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struct platform_device *pdev = to_platform_device(dev);
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struct iio_dev *indio_dev = platform_get_drvdata(pdev);
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struct ad7606_state *st = iio_priv(indio_dev);
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insb((unsigned long) st->base_address, buf, count * 2);
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return 0;
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}
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static const struct ad7606_bus_ops ad7606_par8_bops = {
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.read_block = ad7606_par8_read_block,
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};
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static int __devinit ad7606_par_probe(struct platform_device *pdev)
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{
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struct resource *res;
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struct iio_dev *indio_dev;
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void __iomem *addr;
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resource_size_t remap_size;
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int ret, irq;
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irq = platform_get_irq(pdev, 0);
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if (irq < 0) {
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dev_err(&pdev->dev, "no irq\n");
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return -ENODEV;
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}
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res)
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return -ENODEV;
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remap_size = resource_size(res);
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/* Request the regions */
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if (!request_mem_region(res->start, remap_size, "iio-ad7606")) {
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ret = -EBUSY;
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goto out1;
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}
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addr = ioremap(res->start, remap_size);
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if (!addr) {
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ret = -ENOMEM;
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goto out1;
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}
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indio_dev = ad7606_probe(&pdev->dev, irq, addr,
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platform_get_device_id(pdev)->driver_data,
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remap_size > 1 ? &ad7606_par16_bops :
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&ad7606_par8_bops);
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if (IS_ERR(indio_dev)) {
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ret = PTR_ERR(indio_dev);
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goto out2;
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}
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platform_set_drvdata(pdev, indio_dev);
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return 0;
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out2:
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iounmap(addr);
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out1:
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release_mem_region(res->start, remap_size);
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return ret;
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}
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static int __devexit ad7606_par_remove(struct platform_device *pdev)
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{
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struct iio_dev *indio_dev = platform_get_drvdata(pdev);
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struct resource *res;
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struct ad7606_state *st = iio_priv(indio_dev);
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ad7606_remove(indio_dev);
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iounmap(st->base_address);
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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release_mem_region(res->start, resource_size(res));
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platform_set_drvdata(pdev, NULL);
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return 0;
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}
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#ifdef CONFIG_PM
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static int ad7606_par_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_par_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_par_suspend,
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.resume = ad7606_par_resume,
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};
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#define AD7606_PAR_PM_OPS (&ad7606_pm_ops)
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#else
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#define AD7606_PAR_PM_OPS NULL
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#endif /* CONFIG_PM */
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static struct platform_device_id ad7606_driver_ids[] = {
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{
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.name = "ad7606-8",
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.driver_data = ID_AD7606_8,
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}, {
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.name = "ad7606-6",
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.driver_data = ID_AD7606_6,
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}, {
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.name = "ad7606-4",
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.driver_data = ID_AD7606_4,
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},
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{ }
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};
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MODULE_DEVICE_TABLE(platform, ad7606_driver_ids);
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static struct platform_driver ad7606_driver = {
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.probe = ad7606_par_probe,
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.remove = __devexit_p(ad7606_par_remove),
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.id_table = ad7606_driver_ids,
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.driver = {
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.name = "ad7606",
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.owner = THIS_MODULE,
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.pm = AD7606_PAR_PM_OPS,
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},
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};
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static int __init ad7606_init(void)
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{
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return platform_driver_register(&ad7606_driver);
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}
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static void __exit ad7606_cleanup(void)
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{
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platform_driver_unregister(&ad7606_driver);
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}
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module_init(ad7606_init);
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module_exit(ad7606_cleanup);
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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("platform:ad7606_par");
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