linux-kernel - [PATCH v2 2/8] iio: at91-sama5d2_adc: pass ref to IIO device via param for int function

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Date:   Thu, 14 May 2020 16:17:04 +0300
From:   Alexandru Ardelean <alexandru.ardelean@...log.com>
To:     <linux-iio@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-kernel@...r.kernel.org>
CC:     <ludovic.desroches@...rochip.com>, <eugen.hristev@...rochip.com>,
        <jic23@...nel.org>, <nicolas.ferre@...rochip.com>,
        <alexandre.belloni@...tlin.com>, <alexandre.torgue@...com>,
        <mcoquelin.stm32@...il.com>, <ak@...klinger.de>,
        Alexandru Ardelean <alexandru.ardelean@...log.com>
Subject: [PATCH v2 2/8] iio: at91-sama5d2_adc: pass ref to IIO device via param for int function

Since there will be some changes to how iio_priv_to_dev() is implemented,
it could be that the helper becomes a bit slower, as it will be hidden away
in the IIO core.

For this driver, the IIO device can be passed directly as a parameter to
the at91_adc_no_pen_detect_interrupt() function, thus making it immune to
the change of iio_priv_to_dev().
The function gets called in an interrupt context.

Signed-off-by: Alexandru Ardelean <alexandru.ardelean@...log.com>
---
 drivers/iio/adc/at91-sama5d2_adc.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/iio/adc/at91-sama5d2_adc.c b/drivers/iio/adc/at91-sama5d2_adc.c
index 9abbbdcc7420..822b8782acba 100644
--- a/drivers/iio/adc/at91-sama5d2_adc.c
+++ b/drivers/iio/adc/at91-sama5d2_adc.c
@@ -1275,10 +1275,9 @@ static void at91_adc_pen_detect_interrupt(struct at91_adc_state *st)
 	st->touch_st.touching = true;
 }
 
-static void at91_adc_no_pen_detect_interrupt(struct at91_adc_state *st)
+static void at91_adc_no_pen_detect_interrupt(struct iio_dev *indio_dev,
+					     struct at91_adc_state *st)
 {
-	struct iio_dev *indio_dev = iio_priv_to_dev(st);
-
 	at91_adc_writel(st, AT91_SAMA5D2_TRGR,
 			AT91_SAMA5D2_TRGR_TRGMOD_NO_TRIGGER);
 	at91_adc_writel(st, AT91_SAMA5D2_IDR, AT91_SAMA5D2_IER_NOPEN |
@@ -1318,7 +1317,7 @@ static irqreturn_t at91_adc_interrupt(int irq, void *private)
 		at91_adc_pen_detect_interrupt(st);
 	} else if ((status & AT91_SAMA5D2_IER_NOPEN)) {
 		/* nopen detected IRQ */
-		at91_adc_no_pen_detect_interrupt(st);
+		at91_adc_no_pen_detect_interrupt(indio, st);
 	} else if ((status & AT91_SAMA5D2_ISR_PENS) &&
 		   ((status & rdy_mask) == rdy_mask)) {
 		/* periodic trigger IRQ - during pen sense */
-- 
2.17.1