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83 lines
2.6 KiB
Diff
83 lines
2.6 KiB
Diff
From 4c445577b8f471612389007e5265c7dbfb2c487b Mon Sep 17 00:00:00 2001
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From: Andy Green <andy@openmoko.com>
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Date: Sun, 13 Apr 2008 07:25:59 +0100
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Subject: [PATCH] fix-jack-interrupt-debounce-loss-window.patch
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Make sure we can't lose a jack interrupt in debounce, despite it is
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a one-in-a-million thing that just needs replug to clear
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Signed-off-by: Andy Green <andy@openmoko.com>
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---
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drivers/input/keyboard/neo1973kbd.c | 50 +++++++++++++++++++++++-----------
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1 files changed, 34 insertions(+), 16 deletions(-)
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diff --git a/drivers/input/keyboard/neo1973kbd.c b/drivers/input/keyboard/neo1973kbd.c
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index a1fc7a3..8b9a420 100644
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--- a/drivers/input/keyboard/neo1973kbd.c
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+++ b/drivers/input/keyboard/neo1973kbd.c
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@@ -62,27 +62,45 @@ static irqreturn_t neo1973kbd_hold_irq(int irq, void *dev_id)
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static void neo1973kbd_debounce_jack(struct work_struct *work)
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{
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struct neo1973kbd *kbd = container_of(work, struct neo1973kbd, work);
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-
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- /* we wait out any multiple interrupt stuttering in 100ms lumps */
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+ unsigned long flags;
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+ int loop = 0;
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do {
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- kbd->hp_irq_count_in_work = kbd->hp_irq_count;
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- msleep(100);
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- } while (kbd->hp_irq_count != kbd->hp_irq_count_in_work);
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-
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- /* no new interrupts on jack for 100ms... ok we will report it */
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-
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- input_report_switch(kbd->input,
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- SW_HEADPHONE_INSERT,
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- gpio_get_value(irq_to_gpio(kbd->jack_irq)));
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- input_sync(kbd->input);
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-
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- /* next time we get an interrupt on jack we need new work action */
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- kbd->work_in_progress = 0;
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+ /*
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+ * we wait out any multiple interrupt
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+ * stuttering in 100ms lumps
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+ */
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+ do {
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+ kbd->hp_irq_count_in_work = kbd->hp_irq_count;
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+ msleep(100);
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+ } while (kbd->hp_irq_count != kbd->hp_irq_count_in_work);
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+ /*
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+ * no new interrupts on jack for 100ms...
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+ * ok we will report it
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+ */
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+ input_report_switch(kbd->input, SW_HEADPHONE_INSERT,
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+ gpio_get_value(irq_to_gpio(kbd->jack_irq)));
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+ input_sync(kbd->input);
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+ /*
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+ * we go around the outer loop again if we detect that more
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+ * interrupts came while we are servicing here. But we have
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+ * to sequence it carefully with interrupts off
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+ */
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+ local_save_flags(flags);
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+ /* no interrupts during this work means we can exit the work */
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+ loop = !!(kbd->hp_irq_count != kbd->hp_irq_count_in_work);
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+ if (!loop)
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+ kbd->work_in_progress = 0;
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+ local_irq_restore(flags);
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+ /*
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+ * interrupt that comes here will either queue a new work action
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+ * since work_in_progress is cleared now, or be dealt with
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+ * when we loop.
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+ */
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+ } while (loop);
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}
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-
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static irqreturn_t neo1973kbd_headphone_irq(int irq, void *dev_id)
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{
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struct neo1973kbd *neo1973kbd_data = dev_id;
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--
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1.5.6.5
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