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iio: adc: xilinx: use more devres helpers and remove remove()

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In order to simplify resource management and error paths in probe() and
entirely drop the remove() callback - use devres helpers wherever
possible. Define devm actions for cancelling the delayed work and
disabling the clock.

Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Tested-by: Anand Ashok Dumbre <anandash@xilinx.com>
Reviewed-by: Anand Ashok Dumbre <anandash@xilinx.com>
Link: https://lore.kernel.org/r/20201130142759.28216-4-brgl@bgdev.pl
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Bartosz Golaszewski 2020-11-30 15:27:59 +01:00 committed by Jonathan Cameron
parent eab6471570
commit 2a9685d1a3
1 changed files with 55 additions and 78 deletions
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133
drivers/iio/adc/xilinx-xadc-core.c
View file

@ -738,11 +738,12 @@ static const struct iio_trigger_ops xadc_trigger_ops = {
static struct iio_trigger *xadc_alloc_trigger(struct iio_dev *indio_dev,
const char *name)
{
struct device *dev = indio_dev->dev.parent;
struct iio_trigger *trig;
int ret;
trig = iio_trigger_alloc("%s%d-%s", indio_dev->name,
indio_dev->id, name);
trig = devm_iio_trigger_alloc(dev, "%s%d-%s", indio_dev->name,
indio_dev->id, name);
if (trig == NULL)
return ERR_PTR(-ENOMEM);
@ -750,15 +751,11 @@ static struct iio_trigger *xadc_alloc_trigger(struct iio_dev *indio_dev,
trig->ops = &xadc_trigger_ops;
iio_trigger_set_drvdata(trig, iio_priv(indio_dev));
ret = iio_trigger_register(trig);
ret = devm_iio_trigger_register(dev, trig);
if (ret)
goto error_free_trig;
return ERR_PTR(ret);
return trig;
error_free_trig:
iio_trigger_free(trig);
return ERR_PTR(ret);
}
static int xadc_power_adc_b(struct xadc *xadc, unsigned int seq_mode)
@ -1293,6 +1290,20 @@ static const char * const xadc_type_names[] = {
[XADC_TYPE_US] = "xilinx-system-monitor",
};
static void xadc_clk_disable_unprepare(void *data)
{
struct clk *clk = data;
clk_disable_unprepare(clk);
}
static void xadc_cancel_delayed_work(void *data)
{
struct delayed_work *work = data;
cancel_delayed_work_sync(work);
}
static int xadc_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
@ -1341,34 +1352,35 @@ static int xadc_probe(struct platform_device *pdev)
return ret;
if (xadc->ops->flags & XADC_FLAGS_BUFFERED) {
ret = iio_triggered_buffer_setup(indio_dev,
&iio_pollfunc_store_time, &xadc_trigger_handler,
&xadc_buffer_ops);
ret = devm_iio_triggered_buffer_setup(dev, indio_dev,
&iio_pollfunc_store_time,
&xadc_trigger_handler,
&xadc_buffer_ops);
if (ret)
return ret;
xadc->convst_trigger = xadc_alloc_trigger(indio_dev, "convst");
if (IS_ERR(xadc->convst_trigger)) {
ret = PTR_ERR(xadc->convst_trigger);
goto err_triggered_buffer_cleanup;
}
if (IS_ERR(xadc->convst_trigger))
return PTR_ERR(xadc->convst_trigger);
xadc->samplerate_trigger = xadc_alloc_trigger(indio_dev,
"samplerate");
if (IS_ERR(xadc->samplerate_trigger)) {
ret = PTR_ERR(xadc->samplerate_trigger);
goto err_free_convst_trigger;
}
if (IS_ERR(xadc->samplerate_trigger))
return PTR_ERR(xadc->samplerate_trigger);
}
xadc->clk = devm_clk_get(dev, NULL);
if (IS_ERR(xadc->clk)) {
ret = PTR_ERR(xadc->clk);
goto err_free_samplerate_trigger;
}
if (IS_ERR(xadc->clk))
return PTR_ERR(xadc->clk);
ret = clk_prepare_enable(xadc->clk);
if (ret)
goto err_free_samplerate_trigger;
return ret;
ret = devm_add_action_or_reset(dev,
xadc_clk_disable_unprepare, xadc->clk);
if (ret)
return ret;
/*
* Make sure not to exceed the maximum samplerate since otherwise the
@ -1377,22 +1389,28 @@ static int xadc_probe(struct platform_device *pdev)
if (xadc->ops->flags & XADC_FLAGS_BUFFERED) {
ret = xadc_read_samplerate(xadc);
if (ret < 0)
goto err_free_samplerate_trigger;
return ret;
if (ret > XADC_MAX_SAMPLERATE) {
ret = xadc_write_samplerate(xadc, XADC_MAX_SAMPLERATE);
if (ret < 0)
goto err_free_samplerate_trigger;
return ret;
}
}
ret = request_irq(xadc->irq, xadc->ops->interrupt_handler, 0,
dev_name(dev), indio_dev);
ret = devm_request_irq(dev, xadc->irq, xadc->ops->interrupt_handler, 0,
dev_name(dev), indio_dev);
if (ret)
goto err_clk_disable_unprepare;
return ret;
ret = devm_add_action_or_reset(dev, xadc_cancel_delayed_work,
&xadc->zynq_unmask_work);
if (ret)
return ret;
ret = xadc->ops->setup(pdev, indio_dev, xadc->irq);
if (ret)
goto err_free_irq;
return ret;
for (i = 0; i < 16; i++)
xadc_read_adc_reg(xadc, XADC_REG_THRESHOLD(i),
@ -1400,7 +1418,7 @@ static int xadc_probe(struct platform_device *pdev)
ret = xadc_write_adc_reg(xadc, XADC_REG_CONF0, conf0);
if (ret)
goto err_free_irq;
return ret;
bipolar_mask = 0;
for (i = 0; i < indio_dev->num_channels; i++) {
@ -1410,17 +1428,18 @@ static int xadc_probe(struct platform_device *pdev)
ret = xadc_write_adc_reg(xadc, XADC_REG_INPUT_MODE(0), bipolar_mask);
if (ret)
goto err_free_irq;
return ret;
ret = xadc_write_adc_reg(xadc, XADC_REG_INPUT_MODE(1),
bipolar_mask >> 16);
if (ret)
goto err_free_irq;
return ret;
/* Disable all alarms */
ret = xadc_update_adc_reg(xadc, XADC_REG_CONF1, XADC_CONF1_ALARM_MASK,
XADC_CONF1_ALARM_MASK);
if (ret)
goto err_free_irq;
return ret;
/* Set thresholds to min/max */
for (i = 0; i < 16; i++) {
@ -1435,59 +1454,17 @@ static int xadc_probe(struct platform_device *pdev)
ret = xadc_write_adc_reg(xadc, XADC_REG_THRESHOLD(i),
xadc->threshold[i]);
if (ret)
goto err_free_irq;
return ret;
}
/* Go to non-buffered mode */
xadc_postdisable(indio_dev);
ret = iio_device_register(indio_dev);
if (ret)
goto err_free_irq;
platform_set_drvdata(pdev, indio_dev);
return 0;
err_free_irq:
free_irq(xadc->irq, indio_dev);
cancel_delayed_work_sync(&xadc->zynq_unmask_work);
err_clk_disable_unprepare:
clk_disable_unprepare(xadc->clk);
err_free_samplerate_trigger:
if (xadc->ops->flags & XADC_FLAGS_BUFFERED)
iio_trigger_free(xadc->samplerate_trigger);
err_free_convst_trigger:
if (xadc->ops->flags & XADC_FLAGS_BUFFERED)
iio_trigger_free(xadc->convst_trigger);
err_triggered_buffer_cleanup:
if (xadc->ops->flags & XADC_FLAGS_BUFFERED)
iio_triggered_buffer_cleanup(indio_dev);
return ret;
}
static int xadc_remove(struct platform_device *pdev)
{
struct iio_dev *indio_dev = platform_get_drvdata(pdev);
struct xadc *xadc = iio_priv(indio_dev);
iio_device_unregister(indio_dev);
if (xadc->ops->flags & XADC_FLAGS_BUFFERED) {
iio_trigger_free(xadc->samplerate_trigger);
iio_trigger_free(xadc->convst_trigger);
iio_triggered_buffer_cleanup(indio_dev);
}
free_irq(xadc->irq, indio_dev);
cancel_delayed_work_sync(&xadc->zynq_unmask_work);
clk_disable_unprepare(xadc->clk);
return 0;
return devm_iio_device_register(dev, indio_dev);
}
static struct platform_driver xadc_driver = {
.probe = xadc_probe,
.remove = xadc_remove,
.driver = {
.name = "xadc",
.of_match_table = xadc_of_match_table,