From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sebastian Andrzej Siewior Subject: [PATCH 22/22] iio/ti_am335x_adc: check if we found the value Date: Tue, 11 Jun 2013 13:31:08 +0200 Message-ID: <1370950268-7224-23-git-send-email-bigeasy@linutronix.de> References: <1370950268-7224-1-git-send-email-bigeasy@linutronix.de> Return-path: In-Reply-To: <1370950268-7224-1-git-send-email-bigeasy@linutronix.de> Sender: linux-kernel-owner@vger.kernel.org To: Lee Jones , Samuel Ortiz Cc: =?UTF-8?q?Beno=C3=AEt=20Cousson?= , Tony Lindgren , Jonathan Cameron , Dmitry Torokhov , Felipe Balbi , linux-kernel@vger.kernel.org, linux-omap@vger.kernel.org, linux-iio@vger.kernel.org, linux-input@vger.kernel.org, Sebastian Andrzej Siewior List-Id: linux-omap@vger.kernel.org Usually we get all the values we wanted but it is possible, that te ADC unit is busy performing the conversation for the HW events. In that case -EBUSY is returned and the user may re-call the function. Acked-by: Jonathan Cameron Signed-off-by: Sebastian Andrzej Siewior --- drivers/iio/adc/ti_am335x_adc.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/iio/adc/ti_am335x_adc.c b/drivers/iio/adc/ti_am335x_adc.c index 8ffe52d..4427e8e 100644 --- a/drivers/iio/adc/ti_am335x_adc.c +++ b/drivers/iio/adc/ti_am335x_adc.c @@ -145,6 +145,7 @@ static int tiadc_read_raw(struct iio_dev *indio_dev, int i; unsigned int fifo1count, read; u32 step = UINT_MAX; + bool found = false; /* * When the sub-system is first enabled, @@ -169,11 +170,14 @@ static int tiadc_read_raw(struct iio_dev *indio_dev, fifo1count = tiadc_readl(adc_dev, REG_FIFO1CNT); for (i = 0; i < fifo1count; i++) { read = tiadc_readl(adc_dev, REG_FIFO1); - if (read >> 16 == step) + if (read >> 16 == step) { *val = read & 0xfff; + found = true; + } } am335x_tsc_se_update(adc_dev->mfd_tscadc); - + if (found == false) + return -EBUSY; return IIO_VAL_INT; } -- 1.7.10.4