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authorTony Lindgren <tony@atomide.com>2021-01-11 05:28:40 +0100
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2021-01-11 07:23:02 +0100
commit98b0c88d4bfb53b309350d9cdada96fd0deaa4af (patch)
tree2787f415c30eef3bbe1f5de331432b1f0075f805 /drivers/input/keyboard/omap4-keypad.c
parentInput: omap4-keypad - scan keys in two phases and simplify with bitmask (diff)
downloadlinux-98b0c88d4bfb53b309350d9cdada96fd0deaa4af.tar.xz
linux-98b0c88d4bfb53b309350d9cdada96fd0deaa4af.zip
Input: omap4-keypad - move rest of key scanning to a separate function
Let's move rest of the key scanning code to omap4_keypad_scan_keys(). We will use omap4_keypad_scan_keys() also for implementing errata handling to clear the stuck last key in the following patch. Signed-off-by: Tony Lindgren <tony@atomide.com> Link: https://lore.kernel.org/r/20210110190529.46135-4-tony@atomide.com Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Diffstat (limited to 'drivers/input/keyboard/omap4-keypad.c')
-rw-r--r--drivers/input/keyboard/omap4-keypad.c39
1 files changed, 26 insertions, 13 deletions
diff --git a/drivers/input/keyboard/omap4-keypad.c b/drivers/input/keyboard/omap4-keypad.c
index 6dcf27af856d..c48705dd049b 100644
--- a/drivers/input/keyboard/omap4-keypad.c
+++ b/drivers/input/keyboard/omap4-keypad.c
@@ -71,6 +71,7 @@ struct omap4_keypad {
void __iomem *base;
unsigned int irq;
+ struct mutex lock; /* for key scan */
unsigned int rows;
unsigned int cols;
@@ -135,6 +136,28 @@ static int omap4_keypad_report_keys(struct omap4_keypad *keypad_data,
return events;
}
+static void omap4_keypad_scan_keys(struct omap4_keypad *keypad_data, u64 keys)
+{
+ u64 changed;
+
+ mutex_lock(&keypad_data->lock);
+
+ changed = keys ^ keypad_data->keys;
+
+ /*
+ * Report key up events separately and first. This matters in case we
+ * lost key-up interrupt and just now catching up.
+ */
+ omap4_keypad_report_keys(keypad_data, changed & ~keys, false);
+
+ /* Report key down events */
+ omap4_keypad_report_keys(keypad_data, changed & keys, true);
+
+ keypad_data->keys = keys;
+
+ mutex_unlock(&keypad_data->lock);
+}
+
/* Interrupt handlers */
static irqreturn_t omap4_keypad_irq_handler(int irq, void *dev_id)
{
@@ -150,24 +173,13 @@ static irqreturn_t omap4_keypad_irq_thread_fn(int irq, void *dev_id)
{
struct omap4_keypad *keypad_data = dev_id;
u32 low, high;
- u64 keys, changed;
+ u64 keys;
low = kbd_readl(keypad_data, OMAP4_KBD_FULLCODE31_0);
high = kbd_readl(keypad_data, OMAP4_KBD_FULLCODE63_32);
keys = low | (u64)high << 32;
- changed = keys ^ keypad_data->keys;
-
- /*
- * Report key up events separately and first. This matters in case we
- * lost key-up interrupt and just now catching up.
- */
- omap4_keypad_report_keys(keypad_data, changed & ~keys, false);
-
- /* Report key down events */
- omap4_keypad_report_keys(keypad_data, changed & keys, true);
-
- keypad_data->keys = keys;
+ omap4_keypad_scan_keys(keypad_data, keys);
/* clear pending interrupts */
kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS,
@@ -300,6 +312,7 @@ static int omap4_keypad_probe(struct platform_device *pdev)
}
keypad_data->irq = irq;
+ mutex_init(&keypad_data->lock);
error = omap4_keypad_parse_dt(dev, keypad_data);
if (error)