On 29/01/15 14:30, Varka Bhadram wrote:
> Hi,
>
> On Thursday 29 January 2015 07:39 PM, Markus Pargmann wrote:
>> This is a conversion queue driver for the mx25 SoC. It uses the central
>> ADC which is used by two seperate independent queues. This driver
>> prepares different conversion configurations for each possible input.
>> For a conversion it creates a conversionqueue of one item with the
>> correct configuration for the chosen channel. It then executes the queue
>> once and disables the conversion queue afterwards.
>>
>> The reference voltages are configurable through devicetree subnodes,
>> depending on the connections of the ADC inputs.
>>
>> Signed-off-by: Markus Pargmann <mpa@xxxxxxxxxxxxxx>
>> Signed-off-by: Denis Carikli <denis@xxxxxxxxxx>
>> Signed-off-by: Markus Pargmann <mpa@xxxxxxxxxxxxxx>
>> ---
>> drivers/iio/adc/Kconfig | 7 +
>> drivers/iio/adc/Makefile | 1 +
>> drivers/iio/adc/fsl-imx25-gcq.c | 361 ++++++++++++++++++++++++++++
>> include/dt-bindings/iio/adc/fsl-imx25-gcq.h | 18 ++
>> 4 files changed, 387 insertions(+)
>> create mode 100644 drivers/iio/adc/fsl-imx25-gcq.c
>> create mode 100644 include/dt-bindings/iio/adc/fsl-imx25-gcq.h
>>
> (...)
>
>> +static int mx25_gcq_probe(struct platform_device *pdev)
>> +{
>> + struct iio_dev *indio_dev;
>> + struct mx25_gcq_priv *priv;
>> + struct mx25_tsadc *tsadc = dev_get_drvdata(pdev->dev.parent);
>> + struct device *dev = &pdev->dev;
>> + struct resource *res;
>> + void __iomem *mem;
>> + int ret;
>> +
>> + indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*priv));
>> + if (!indio_dev)
>> + return -ENOMEM;
>> +
>> + priv = iio_priv(indio_dev);
>> +
>> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> + mem = devm_ioremap_resource(dev, res);
>> + if (!mem)
>> + return -ENOMEM;
>> +
>> + priv->regs = devm_regmap_init_mmio(dev, mem, &mx25_gcq_regconfig);
>> + if (IS_ERR(priv->regs)) {
>> + dev_err(dev, "Failed to initialize regmap\n");
>> + return PTR_ERR(priv->regs);
>> + }
>> +
>> + init_completion(&priv->completed);
>> +
>> + /* Optional external regulator */
>> + priv->ext_vref = devm_regulator_get(&pdev->dev, "vref");
>> + if (!IS_ERR_OR_NULL(priv->ext_vref)) {
>> + ret = regulator_enable(priv->ext_vref);
>> + if (ret)
>> + return ret;
>> + }
>> +
>> + ret = mx25_gcq_setup_cfgs(pdev, priv);
>> + if (ret)
>> + return ret;
>> +
>> + priv->clk = tsadc->clk;
>> + ret = clk_prepare_enable(priv->clk);
>> + if (ret) {
>> + dev_err(dev, "Failed to enable clock\n");
>> + return ret;
>> + }
>> +
>> + priv->irq = platform_get_irq(pdev, 0);
>> + if (priv->irq <= 0) {
>> + dev_err(dev, "Failed to get IRQ\n");
>> + ret = priv->irq;
>> + goto err_clk_unprepare;
>> + }
>> +
>> + ret = request_irq(priv->irq, mx25_gcq_irq, 0, pdev->name, priv);
>
> Use of devm_* API
Changes the ordering wrt to the clk prepare / unprepare so don't use
devm (or change the order if appropriate! (I haven't thought about it!)
>
>> + if (ret) {
>> + dev_err(dev, "Failed requesting IRQ\n");
>> + goto err_clk_unprepare;
>> + }
>> +
>> + indio_dev->dev.parent = &pdev->dev;
>> + indio_dev->channels = mx25_gcq_channels;
>> + indio_dev->num_channels = ARRAY_SIZE(mx25_gcq_channels);
>> + indio_dev->info = &mx25_gcq_iio_info;
>> +
>> + ret = iio_device_register(indio_dev);
>> + if (ret) {
>> + dev_err(dev, "Failed to register iio device\n");
>> + goto err_irq_free;
>> + }
>> +
>> + platform_set_drvdata(pdev, priv);
>> +
>> + return 0;
>> +
>> +err_irq_free:
>> + free_irq(priv->irq, (void *)priv);
>
> This is not required if use devm_*
>
>> +err_clk_unprepare:
>> + clk_disable_unprepare(priv->clk);
>> + return ret;
>> +}
>> +
>> +static int mx25_gcq_remove(struct platform_device *pdev)
>> +{
>> + struct mx25_gcq_priv *priv = platform_get_drvdata(pdev);
>> + struct iio_dev *indio_dev = iio_priv_to_dev(pdev);
>> +
>> + iio_device_unregister(indio_dev);
>> + free_irq(priv->irq, priv);
>
> Dto...
>
>>
>
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