mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-11-24 22:32:27 +02:00
fc54b9bf15
(stable-branch of Openmoko) git-svn-id: svn://svn.openwrt.org/openwrt/trunk@13613 3c298f89-4303-0410-b956-a3cf2f4a3e73
119 lines
3.7 KiB
Diff
119 lines
3.7 KiB
Diff
From 9a5d2d81c0bf5c8fe2ac58d267033876904ed925 Mon Sep 17 00:00:00 2001
|
|
From: Andy Green <andy@openmoko.com>
|
|
Date: Sun, 13 Apr 2008 07:25:57 +0100
|
|
Subject: [PATCH] fix-jack-debounce.patch
|
|
|
|
Headphone jack detection is bouncy, it can trigger multiple interrupts
|
|
on insertion or removal. This patch adds a workqueue that waits out the
|
|
interrupt spew in 100ms units, and if it sees no more interrupts for 100ms
|
|
only then samples and reports the jack state. I was unable to get a bounce
|
|
after 20 or so tries after this.
|
|
|
|
Signed-off-by: Andy Green <andy@openmoko.com>
|
|
---
|
|
drivers/input/keyboard/neo1973kbd.c | 63 ++++++++++++++++++++++++++++++++--
|
|
1 files changed, 59 insertions(+), 4 deletions(-)
|
|
|
|
diff --git a/drivers/input/keyboard/neo1973kbd.c b/drivers/input/keyboard/neo1973kbd.c
|
|
index 06fa8e0..6c96660 100644
|
|
--- a/drivers/input/keyboard/neo1973kbd.c
|
|
+++ b/drivers/input/keyboard/neo1973kbd.c
|
|
@@ -21,6 +21,7 @@
|
|
#include <linux/jiffies.h>
|
|
#include <linux/module.h>
|
|
#include <linux/slab.h>
|
|
+#include <linux/workqueue.h>
|
|
|
|
#include <asm/gpio.h>
|
|
#include <asm/mach-types.h>
|
|
@@ -28,6 +29,11 @@
|
|
struct neo1973kbd {
|
|
struct input_dev *input;
|
|
unsigned int suspended;
|
|
+ struct work_struct work;
|
|
+ int work_in_progress;
|
|
+ int hp_irq_count_in_work;
|
|
+ int hp_irq_count;
|
|
+ int jack_irq;
|
|
};
|
|
|
|
static irqreturn_t neo1973kbd_aux_irq(int irq, void *dev_id)
|
|
@@ -52,14 +58,61 @@ static irqreturn_t neo1973kbd_hold_irq(int irq, void *dev_id)
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
+
|
|
+static void neo1973kbd_debounce_jack(struct work_struct *work)
|
|
+{
|
|
+ struct neo1973kbd *kbd = container_of(work, struct neo1973kbd, work);
|
|
+
|
|
+ /* we wait out any multiple interrupt stuttering in 100ms lumps */
|
|
+
|
|
+ do {
|
|
+ kbd->hp_irq_count_in_work = kbd->hp_irq_count;
|
|
+ msleep(100);
|
|
+ } while (kbd->hp_irq_count != kbd->hp_irq_count_in_work);
|
|
+
|
|
+ /* no new interrupts on jack for 100ms... ok we will report it */
|
|
+
|
|
+ input_report_switch(kbd->input,
|
|
+ SW_HEADPHONE_INSERT,
|
|
+ gpio_get_value(irq_to_gpio(kbd->jack_irq)));
|
|
+ input_sync(kbd->input);
|
|
+
|
|
+ /* next time we get an interrupt on jack we need new work action */
|
|
+ kbd->work_in_progress = 0;
|
|
+}
|
|
+
|
|
+
|
|
+
|
|
static irqreturn_t neo1973kbd_headphone_irq(int irq, void *dev_id)
|
|
{
|
|
struct neo1973kbd *neo1973kbd_data = dev_id;
|
|
|
|
- int key_pressed = gpio_get_value(irq_to_gpio(irq));
|
|
- input_report_switch(neo1973kbd_data->input,
|
|
- SW_HEADPHONE_INSERT, key_pressed);
|
|
- input_sync(neo1973kbd_data->input);
|
|
+ /*
|
|
+ * this interrupt is prone to bouncing and userspace doesn't like
|
|
+ * to have to deal with that kind of thing. So we do not accept
|
|
+ * that a jack interrupt is equal to a jack event. Instead we fire
|
|
+ * some work on the first interrupt, and it hangs about in 100ms units
|
|
+ * until no more interrupts come. Then it accepts the state it finds
|
|
+ * for jack insert and reports it once
|
|
+ */
|
|
+
|
|
+ neo1973kbd_data->hp_irq_count++;
|
|
+ /*
|
|
+ * the first interrupt we see for a while, we fire the work item
|
|
+ * and record the interrupt count when we did that. If more interrupts
|
|
+ * come in the meanwhile, we can tell by the difference in that
|
|
+ * stored count and hp_irq_count which increments every interrupt
|
|
+ */
|
|
+ if (!neo1973kbd_data->work_in_progress) {
|
|
+ neo1973kbd_data->jack_irq = irq;
|
|
+ neo1973kbd_data->hp_irq_count_in_work =
|
|
+ neo1973kbd_data->hp_irq_count;
|
|
+ if (!schedule_work(&neo1973kbd_data->work))
|
|
+ printk(KERN_ERR
|
|
+ "Unable to schedule headphone debounce\n");
|
|
+ else
|
|
+ neo1973kbd_data->work_in_progress = 1;
|
|
+ }
|
|
|
|
return IRQ_HANDLED;
|
|
}
|
|
@@ -120,6 +173,8 @@ static int neo1973kbd_probe(struct platform_device *pdev)
|
|
|
|
neo1973kbd->input = input_dev;
|
|
|
|
+ INIT_WORK(&neo1973kbd->work, neo1973kbd_debounce_jack);
|
|
+
|
|
input_dev->name = "Neo1973 Buttons";
|
|
input_dev->phys = "neo1973kbd/input0";
|
|
input_dev->id.bustype = BUS_HOST;
|
|
--
|
|
1.5.6.5
|
|
|