From: Dmitry Torokhov <dmitry.torokhov@gmail.com>
To: Arnd Bergmann <arnd@arndb.de>
Cc: Haojian Zhuang <haojian.zhuang@gmail.com>,
Marek Vasut <marek.vasut@gmail.com>,
Daniel Mack <daniel@zonque.org>, Mark Brown <broonie@kernel.org>,
Robert Jarzmik <robert.jarzmik@free.fr>,
linux-input@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH 1/2] Input: wm97xx - switch to using threaded IRQ
Date: Fri, 18 Oct 2019 13:48:33 -0700 [thread overview]
Message-ID: <20191018204834.213424-1-dmitry.torokhov@gmail.com> (raw)
Instead of manually disabling and enabling interrupts and scheduling work
to access the device, let's use threaded oneshot interrupt handler. It
simplifies things.
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
---
drivers/input/touchscreen/wm97xx-core.c | 42 +++++--------------------
include/linux/wm97xx.h | 1 -
2 files changed, 7 insertions(+), 36 deletions(-)
diff --git a/drivers/input/touchscreen/wm97xx-core.c b/drivers/input/touchscreen/wm97xx-core.c
index 0a174bd82915..a9c6267a2998 100644
--- a/drivers/input/touchscreen/wm97xx-core.c
+++ b/drivers/input/touchscreen/wm97xx-core.c
@@ -285,11 +285,12 @@ void wm97xx_set_suspend_mode(struct wm97xx *wm, u16 mode)
EXPORT_SYMBOL_GPL(wm97xx_set_suspend_mode);
/*
- * Handle a pen down interrupt.
+ * Codec PENDOWN irq handler
+ *
*/
-static void wm97xx_pen_irq_worker(struct work_struct *work)
+static irqreturn_t wm97xx_pen_interrupt(int irq, void *dev_id)
{
- struct wm97xx *wm = container_of(work, struct wm97xx, pen_event_work);
+ struct wm97xx *wm = dev_id;
int pen_was_down = wm->pen_is_down;
/* do we need to enable the touch panel reader */
@@ -343,27 +344,6 @@ static void wm97xx_pen_irq_worker(struct work_struct *work)
if (!wm->pen_is_down && wm->mach_ops->acc_enabled)
wm->mach_ops->acc_pen_up(wm);
- wm->mach_ops->irq_enable(wm, 1);
-}
-
-/*
- * Codec PENDOWN irq handler
- *
- * We have to disable the codec interrupt in the handler because it
- * can take up to 1ms to clear the interrupt source. We schedule a task
- * in a work queue to do the actual interaction with the chip. The
- * interrupt is then enabled again in the slow handler when the source
- * has been cleared.
- */
-static irqreturn_t wm97xx_pen_interrupt(int irq, void *dev_id)
-{
- struct wm97xx *wm = dev_id;
-
- if (!work_pending(&wm->pen_event_work)) {
- wm->mach_ops->irq_enable(wm, 0);
- queue_work(wm->ts_workq, &wm->pen_event_work);
- }
-
return IRQ_HANDLED;
}
@@ -374,12 +354,9 @@ static int wm97xx_init_pen_irq(struct wm97xx *wm)
{
u16 reg;
- /* If an interrupt is supplied an IRQ enable operation must also be
- * provided. */
- BUG_ON(!wm->mach_ops->irq_enable);
-
- if (request_irq(wm->pen_irq, wm97xx_pen_interrupt, IRQF_SHARED,
- "wm97xx-pen", wm)) {
+ if (request_threaded_irq(wm->pen_irq, NULL, wm97xx_pen_interrupt,
+ IRQF_SHARED | IRQF_ONESHOT,
+ "wm97xx-pen", wm)) {
dev_err(wm->dev,
"Failed to register pen down interrupt, polling");
wm->pen_irq = 0;
@@ -509,7 +486,6 @@ static int wm97xx_ts_input_open(struct input_dev *idev)
wm->codec->dig_enable(wm, 1);
INIT_DELAYED_WORK(&wm->ts_reader, wm97xx_ts_reader);
- INIT_WORK(&wm->pen_event_work, wm97xx_pen_irq_worker);
wm->ts_reader_min_interval = HZ >= 100 ? HZ / 100 : 1;
if (wm->ts_reader_min_interval < 1)
@@ -560,10 +536,6 @@ static void wm97xx_ts_input_close(struct input_dev *idev)
wm->pen_is_down = 0;
- /* Balance out interrupt disables/enables */
- if (cancel_work_sync(&wm->pen_event_work))
- wm->mach_ops->irq_enable(wm, 1);
-
/* ts_reader rearms itself so we need to explicitly stop it
* before we destroy the workqueue.
*/
diff --git a/include/linux/wm97xx.h b/include/linux/wm97xx.h
index 58e082dadc68..7d5496fa6ac7 100644
--- a/include/linux/wm97xx.h
+++ b/include/linux/wm97xx.h
@@ -281,7 +281,6 @@ struct wm97xx {
unsigned long ts_reader_min_interval; /* Minimum interval */
unsigned int pen_irq; /* Pen IRQ number in use */
struct workqueue_struct *ts_workq;
- struct work_struct pen_event_work;
u16 acc_slot; /* AC97 slot used for acc touch data */
u16 acc_rate; /* acc touch data rate */
unsigned pen_is_down:1; /* Pen is down */
--
2.23.0.866.gb869b98d4c-goog
next reply other threads:[~2019-10-18 20:48 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-18 20:48 Dmitry Torokhov [this message]
2019-10-18 20:48 ` [PATCH 2/2] Input: wm97xx - get rid of irq_enable method in wm97xx_mach_ops Dmitry Torokhov
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