This patch implements suspend/resume support for mxs-lradc.
It's possible to use the touchscreen as wakeup source.
Signed-off-by: Stefan Wahren <stefan.wahren@xxxxxxxx>
---
drivers/iio/adc/mxs-lradc.c | 61 +++++++++++++++++++++++++++++++++++++++++++
1 file changed, 61 insertions(+)
diff --git a/drivers/iio/adc/mxs-lradc.c b/drivers/iio/adc/mxs-lradc.c
index cfc558f..6bd387f 100644
--- a/drivers/iio/adc/mxs-lradc.c
+++ b/drivers/iio/adc/mxs-lradc.c
@@ -29,6 +29,7 @@
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
+#include <linux/pm.h>
#include <linux/slab.h>
#include <linux/stmp_device.h>
#include <linux/sysfs.h>
@@ -1745,10 +1746,70 @@ static int mxs_lradc_remove(struct platform_device *pdev)
return 0;
}
+static int __maybe_unused mxs_lradc_suspend(struct device *dev)
+{
+ struct iio_dev *iio = dev_get_drvdata(dev);
+ struct mxs_lradc *lradc = iio_priv(iio);
+ struct input_dev *input = lradc->ts_input;
+ int ret = 0;
+
+ if (input) {
+ mutex_lock(&input->mutex);
+
+ /* Enable touchscreen wakeup irq */
+ if (input->users && device_may_wakeup(dev))
+ ret = enable_irq_wake(lradc->irq[0]);
+ else
+ mxs_lradc_disable_ts(lradc);
+
+ mutex_unlock(&input->mutex);
+ }
+
+ if (ret)
+ return ret;
+
+ mxs_lradc_hw_stop(lradc);
+
+ clk_disable_unprepare(lradc->clk);
+
+ return ret;
+}
+
+static int __maybe_unused mxs_lradc_resume(struct device *dev)
+{
+ struct iio_dev *iio = dev_get_drvdata(dev);
+ struct mxs_lradc *lradc = iio_priv(iio);
+ struct input_dev *input = lradc->ts_input;
+ int ret;
+
+ ret = clk_prepare_enable(lradc->clk);
+ if (ret)
+ return ret;
+
+ mxs_lradc_hw_init(lradc);
+
+ if (input) {
+ mutex_lock(&input->mutex);
+
+ /* Disable touchscreen wakeup irq */
+ if (input->users && device_may_wakeup(dev))
+ ret = disable_irq_wake(lradc->irq[0]);
+ else
+ mxs_lradc_enable_touch_detection(lradc);
+
+ mutex_unlock(&input->mutex);
+ }
+
+ return ret;
+}
+
+static SIMPLE_DEV_PM_OPS(mxs_lradc_pm_ops, mxs_lradc_suspend, mxs_lradc_resume);
+
static struct platform_driver mxs_lradc_driver = {
.driver = {
.name = DRIVER_NAME,
.of_match_table = mxs_lradc_dt_ids,
+ .pm = &mxs_lradc_pm_ops,
},
.probe = mxs_lradc_probe,
.remove = mxs_lradc_remove,
--
1.7.9.5
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