linux-kernel - [PATCH 5/5] iio: stmpe-adc: Reset possible interrupts

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Date:   Tue,  7 May 2019 16:36:15 +0200
From:   Philippe Schenker <dev@...henker.ch>
To:     linux-iio@...r.kernel.org, Jonathan Cameron <jic23@...nel.org>,
        Stefan Agner <stefan@...er.ch>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>
Cc:     Marcel Ziswiler <marcel.ziswiler@...adex.com>,
        David Laight <David.Laight@...LAB.COM>, dev@...henker.ch,
        Philippe Schenker <philippe.schenker@...adex.com>,
        Max Krummenacher <max.krummenacher@...adex.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        linux-kernel@...r.kernel.org, Lee Jones <lee.jones@...aro.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH 5/5] iio: stmpe-adc: Reset possible interrupts

From: Philippe Schenker <philippe.schenker@...adex.com>

Clear any interrupt that still is on the device on every channel
this driver is activated for in probe and specific channels in
the timeout handler.

Signed-off-by: Philippe Schenker <philippe.schenker@...adex.com>

---

 drivers/iio/adc/stmpe-adc.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/iio/adc/stmpe-adc.c b/drivers/iio/adc/stmpe-adc.c
index cc752a47444c..a5990e9f2c80 100644
--- a/drivers/iio/adc/stmpe-adc.c
+++ b/drivers/iio/adc/stmpe-adc.c
@@ -80,6 +80,8 @@ static int stmpe_read_voltage(struct stmpe_adc *info,
 	ret = wait_for_completion_timeout(&info->completion, STMPE_ADC_TIMEOUT);
 
 	if (ret <= 0) {
+		stmpe_reg_write(info->stmpe, STMPE_REG_ADC_INT_STA,
+				STMPE_ADC_CH(info->channel));
 		mutex_unlock(&info->lock);
 		return -ETIMEDOUT;
 	}
@@ -326,6 +328,9 @@ static int stmpe_adc_probe(struct platform_device *pdev)
 	stmpe_reg_write(info->stmpe, STMPE_REG_ADC_INT_EN,
 			~(norequest_mask & 0xFF));
 
+	stmpe_reg_write(info->stmpe, STMPE_REG_ADC_INT_STA,
+			~(norequest_mask & 0xFF));
+
 	return devm_iio_device_register(&pdev->dev, indio_dev);
 }
 
-- 
2.21.0