mfd: Convert AB3100 driver to threaded IRQ
This converts the AB3100 core MFD driver to use a threaded
interrupt handler instead of the explicit top/bottom-half
construction with a workqueue. This saves some code and make it
more similar to other modern MFD drivers.
Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
diff --git a/drivers/mfd/ab3100-core.c b/drivers/mfd/ab3100-core.c
index fd42a80..aa3824a 100644
--- a/drivers/mfd/ab3100-core.c
+++ b/drivers/mfd/ab3100-core.c
@@ -365,10 +365,13 @@
}
EXPORT_SYMBOL(ab3100_event_registers_startup_state_get);
-/* Interrupt handling worker */
-static void ab3100_work(struct work_struct *work)
+/*
+ * This is a threaded interrupt handler so we can make some
+ * I2C calls etc.
+ */
+static irqreturn_t ab3100_irq_handler(int irq, void *data)
{
- struct ab3100 *ab3100 = container_of(work, struct ab3100, work);
+ struct ab3100 *ab3100 = data;
u8 event_regs[3];
u32 fatevent;
int err;
@@ -376,7 +379,7 @@
err = ab3100_get_register_page_interruptible(ab3100, AB3100_EVENTA1,
event_regs, 3);
if (err)
- goto err_event_wq;
+ goto err_event;
fatevent = (event_regs[0] << 16) |
(event_regs[1] << 8) |
@@ -398,29 +401,11 @@
dev_dbg(ab3100->dev,
"IRQ Event: 0x%08x\n", fatevent);
- /* By now the IRQ should be acked and deasserted so enable it again */
- enable_irq(ab3100->i2c_client->irq);
- return;
+ return IRQ_HANDLED;
- err_event_wq:
+ err_event:
dev_dbg(ab3100->dev,
- "error in event workqueue\n");
- /* Enable the IRQ anyway, what choice do we have? */
- enable_irq(ab3100->i2c_client->irq);
- return;
-}
-
-static irqreturn_t ab3100_irq_handler(int irq, void *data)
-{
- struct ab3100 *ab3100 = data;
- /*
- * Disable the IRQ and dispatch a worker to handle the
- * event. Since the chip resides on I2C this is slow
- * stuff and we will re-enable the interrupts once th
- * worker has finished.
- */
- disable_irq_nosync(irq);
- schedule_work(&ab3100->work);
+ "error reading event status\n");
return IRQ_HANDLED;
}
@@ -904,12 +889,10 @@
if (err)
goto exit_no_setup;
- INIT_WORK(&ab3100->work, ab3100_work);
-
/* This real unpredictable IRQ is of course sampled for entropy */
- err = request_irq(client->irq, ab3100_irq_handler,
- IRQF_DISABLED | IRQF_SAMPLE_RANDOM,
- "AB3100 IRQ", ab3100);
+ err = request_threaded_irq(client->irq, NULL, ab3100_irq_handler,
+ IRQF_ONESHOT,
+ "ab3100-core", ab3100);
if (err)
goto exit_no_irq;