[PATCH 2/3] iio: adc: ti_am335x_adc: alloc kfifo & IRQ via devm_ functions

[Alexandru Ardelean]

This change attaches the life-cycle of the kfifo buffer & IRQ to the
parent-device. This in turn cleans up the exit & error paths, since we
don't need to explicitly cleanup these resources.

The main intent here is to remove the explicit cleanup of the
'indio_dev->buffer' via 'iio_kfifo_free(indio_dev->buffer);'.

As we want to add support for multiple buffers per IIO device, having it
exposed like this makes it tricky to consider a safe backwards compatible
approach for it.

Signed-off-by: Alexandru Ardelean <alexandru.ardel...@analog.com>
---
 drivers/iio/adc/ti_am335x_adc.c | 20 +++++---------------
 1 file changed, 5 insertions(+), 15 deletions(-)

diff --git a/drivers/iio/adc/ti_am335x_adc.c b/drivers/iio/adc/ti_am335x_adc.c
index d932fe383a24..03b2ab649cc3 100644
--- a/drivers/iio/adc/ti_am335x_adc.c
+++ b/drivers/iio/adc/ti_am335x_adc.c
@@ -377,7 +377,8 @@ static const struct iio_buffer_setup_ops 
tiadc_buffer_setup_ops = {
        .postdisable = &tiadc_buffer_postdisable,
 };
 
-static int tiadc_iio_buffered_hardware_setup(struct iio_dev *indio_dev,
+static int tiadc_iio_buffered_hardware_setup(struct device *dev,
+       struct iio_dev *indio_dev,
        irqreturn_t (*pollfunc_bh)(int irq, void *p),
        irqreturn_t (*pollfunc_th)(int irq, void *p),
        int irq,
@@ -387,13 +388,13 @@ static int tiadc_iio_buffered_hardware_setup(struct 
iio_dev *indio_dev,
        struct iio_buffer *buffer;
        int ret;
 
-       buffer = iio_kfifo_allocate();
+       buffer = devm_iio_kfifo_allocate(dev);
        if (!buffer)
                return -ENOMEM;
 
        iio_device_attach_buffer(indio_dev, buffer);
 
-       ret = request_threaded_irq(irq, pollfunc_th, pollfunc_bh,
+       ret = devm_request_threaded_irq(dev, irq, pollfunc_th, pollfunc_bh,
                                flags, indio_dev->name, indio_dev);
        if (ret)
                goto error_kfifo_free;
@@ -408,15 +409,6 @@ static int tiadc_iio_buffered_hardware_setup(struct 
iio_dev *indio_dev,
        return ret;
 }
 
-static void tiadc_iio_buffered_hardware_remove(struct iio_dev *indio_dev)
-{
-       struct tiadc_device *adc_dev = iio_priv(indio_dev);
-
-       free_irq(adc_dev->mfd_tscadc->irq, indio_dev);
-       iio_kfifo_free(indio_dev->buffer);
-}
-
-
 static const char * const chan_name_ain[] = {
        "AIN0",
        "AIN1",
@@ -636,7 +628,7 @@ static int tiadc_probe(struct platform_device *pdev)
        if (err < 0)
                return err;
 
-       err = tiadc_iio_buffered_hardware_setup(indio_dev,
+       err = tiadc_iio_buffered_hardware_setup(&pdev->dev, indio_dev,
                &tiadc_worker_h,
                &tiadc_irq_h,
                adc_dev->mfd_tscadc->irq,
@@ -661,7 +653,6 @@ static int tiadc_probe(struct platform_device *pdev)
 err_dma:
        iio_device_unregister(indio_dev);
 err_buffer_unregister:
-       tiadc_iio_buffered_hardware_remove(indio_dev);
 err_free_channels:
        return err;
 }
@@ -679,7 +670,6 @@ static int tiadc_remove(struct platform_device *pdev)
                dma_release_channel(dma->chan);
        }
        iio_device_unregister(indio_dev);
-       tiadc_iio_buffered_hardware_remove(indio_dev);
 
        step_en = get_adc_step_mask(adc_dev);
        am335x_tsc_se_clr(adc_dev->mfd_tscadc, step_en);
-- 
2.17.1