> +static int alt_modular_adc_probe(struct platform_device *pdev)
> +{
> + struct altera_adc *adc;
> + struct device_node *np = pdev->dev.of_node;
> + struct iio_dev *indio_dev;
> + struct resource *mem;
> + int ret;
> +
> + if (!np)
> + return -ENODEV;
> +
> + indio_dev = iio_device_alloc(sizeof(struct altera_adc));
> + if (!indio_dev) {
> + dev_err(&pdev->dev, "failed allocating iio device\n");
> + return -ENOMEM;
> + }
> +
> + adc = iio_priv(indio_dev);
> +
> + mem = platform_get_resource_byname(pdev, IORESOURCE_MEM,
> + "sequencer_csr");
> + adc->seq_regs = devm_ioremap_resource(&pdev->dev, mem);
> + if (IS_ERR(adc->seq_regs)) {
> + ret = PTR_ERR(adc->seq_regs);
> + goto err_iio;
> + }
> +
> + mem = platform_get_resource_byname(pdev, IORESOURCE_MEM,
> + "sample_store_csr");
> + adc->sample_regs = devm_ioremap_resource(&pdev->dev, mem);
> + if (IS_ERR(adc->sample_regs)) {
> + ret = PTR_ERR(adc->sample_regs);
> + goto err_iio;
> + }
> +
> + ret = alt_modular_adc_parse_dt(indio_dev, &pdev->dev);
> + if (ret < 0) {
> + dev_err(&pdev->dev, "failed to parse device tree\n");
> + goto err_iio;
> + }
> +
> + ret = alt_modular_adc_channel_init(indio_dev);
> + if (ret < 0) {
> + dev_err(&pdev->dev, "failed initialize ADC channels\n");
> + goto err_iio;
> + }
> +
> + platform_set_drvdata(pdev, indio_dev);
> +
> + indio_dev->name = dev_name(&pdev->dev);
> + indio_dev->dev.parent = &pdev->dev;
> + indio_dev->dev.of_node = pdev->dev.of_node;
> + indio_dev->info = &adc_iio_info;
> + indio_dev->modes = INDIO_DIRECT_MODE;
> + indio_dev->num_channels = adc->slot_count;
> +
> + ret = iio_device_register(indio_dev);
> + if (ret)
> + goto err_iio;
> +
> + /* Disable Interrupt */
> + writel_relaxed(0, (adc->sample_regs + ADC_IER_REG));
Why disable interrupts?
> +
> + /* Start Continuous Sampling */
> + writel_relaxed((ADC_RUN_MSK), (adc->seq_regs + ADC_CMD_REG));
> +
> + return 0;
> +
> +
> +err_iio:
> + iio_device_free(indio_dev);
> + return ret;
> +}
> +
> +static int alt_modular_adc_remove(struct platform_device *pdev)
> +{
> + struct iio_dev *indio_dev = platform_get_drvdata(pdev);
> + struct altera_adc *adc = iio_priv(indio_dev);
> +
> + /* Stop ADC */
> + writel((ADC_STOP_MSK), (adc->seq_regs + ADC_CMD_REG));
> +
> + /* Unregister ADC */
> + iio_device_unregister(indio_dev);
> +
> + return 0;
> +}
> +
> +static struct platform_driver altr_modular_adc_driver = {
> + .probe = alt_modular_adc_probe,
> + .remove = alt_modular_adc_remove,
> + .driver = {
> + .name = "alt-modular-adc",
> + .owner = THIS_MODULE,
> + .of_match_table = alt_modular_adc_match,
> + },
> +};
> +
> +
> +module_platform_driver(altr_modular_adc_driver);
> +
> +MODULE_DESCRIPTION("Altera Modular ADC Driver");
> +MODULE_AUTHOR("Chee Nouk Phoon <cnphoon@xxxxxxxxxx>");
> +MODULE_LICENSE("GPL v2");
> --
> 1.7.1
>
> --
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