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Date: Mon, 09 Nov 2009 01:25:21 -0800
From: Dmitry Torokhov <dmitry.torokhov@...il.com>
To: Samuel Ortiz <sameo@...ux.intel.com>
Cc: linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] mfd: pcf50633 - use threaded interrupts
Switch to using theraded IRQs instead of implementing custom solution
with regular inettrup dandler and a custom workqueue.
Signed-off-by: Dmitry Torokhov <dtor@...l.ru>
---
drivers/mfd/pcf50633-core.c | 87 +++++++++++--------------------------
include/linux/mfd/pcf50633/core.h | 6 +--
2 files changed, 29 insertions(+), 64 deletions(-)
diff --git a/drivers/mfd/pcf50633-core.c b/drivers/mfd/pcf50633-core.c
index a3d0226..4aeefa2 100644
--- a/drivers/mfd/pcf50633-core.c
+++ b/drivers/mfd/pcf50633-core.c
@@ -126,7 +126,6 @@ int pcf50633_reg_set_bit_mask(struct pcf50633 *pcf, u8 reg, u8 mask, u8 val)
out:
mutex_unlock(&pcf->lock);
-
return ret;
}
EXPORT_SYMBOL_GPL(pcf50633_reg_set_bit_mask);
@@ -324,13 +323,13 @@ static void pcf50633_irq_call_handler(struct pcf50633 *pcf, int irq)
/* Maximum amount of time ONKEY is held before emergency action is taken */
#define PCF50633_ONKEY1S_TIMEOUT 8
-static void pcf50633_irq_worker(struct work_struct *work)
+static irqreturn_t pcf50633_irq(int irq, void *data)
{
- struct pcf50633 *pcf;
+ struct pcf50633 *pcf = data;
int ret, i, j;
u8 pcf_int[5], chgstat;
- pcf = container_of(work, struct pcf50633, irq_work);
+ dev_dbg(pcf->dev, "pcf50633_irq\n");
/* Read the 5 INT regs in one transaction */
ret = pcf50633_read_block(pcf, PCF50633_REG_INT1,
@@ -345,8 +344,10 @@ static void pcf50633_irq_worker(struct work_struct *work)
goto out;
}
- /* We immediately read the usb and adapter status. We thus make sure
- * only of USBINS/USBREM IRQ handlers are called */
+ /*
+ * We immediately read the usb and adapter status. We thus make sure
+ * only of USBINS/USBREM IRQ handlers are called
+ */
if (pcf_int[0] & (PCF50633_INT1_USBINS | PCF50633_INT1_USBREM)) {
chgstat = pcf50633_reg_read(pcf, PCF50633_REG_MBCS2);
if (chgstat & (0x3 << 4))
@@ -364,15 +365,17 @@ static void pcf50633_irq_worker(struct work_struct *work)
pcf_int[0] &= ~(1 << PCF50633_INT1_ADPINS);
}
- dev_dbg(pcf->dev, "INT1=0x%02x INT2=0x%02x INT3=0x%02x "
- "INT4=0x%02x INT5=0x%02x\n", pcf_int[0],
- pcf_int[1], pcf_int[2], pcf_int[3], pcf_int[4]);
+ dev_dbg(pcf->dev,
+ "INT1=0x%02x INT2=0x%02x INT3=0x%02x INT4=0x%02x INT5=0x%02x\n",
+ pcf_int[0], pcf_int[1], pcf_int[2], pcf_int[3], pcf_int[4]);
- /* Some revisions of the chip don't have a 8s standby mode on
- * ONKEY1S press. We try to manually do it in such cases. */
+ /*
+ * Some revisions of the chip don't have a 8s standby mode on
+ * ONKEY1S press. We try to manually do it in such cases.
+ */
if ((pcf_int[0] & PCF50633_INT1_SECOND) && pcf->onkey1s_held) {
- dev_info(pcf->dev, "ONKEY1S held for %d secs\n",
- pcf->onkey1s_held);
+ dev_info(pcf->dev,
+ "ONKEY1S held for %d secs\n", pcf->onkey1s_held);
if (pcf->onkey1s_held++ == PCF50633_ONKEY1S_TIMEOUT)
if (pcf->pdata->force_shutdown)
pcf->pdata->force_shutdown(pcf);
@@ -409,8 +412,8 @@ static void pcf50633_irq_worker(struct work_struct *work)
}
/* Have we just resumed ? */
- if (pcf->is_suspended) {
- pcf->is_suspended = 0;
+ if (unlikely(pcf->is_suspended)) {
+ pcf->is_suspended = false;
/* Set the resume reason filtering out non resumers */
for (i = 0; i < ARRAY_SIZE(pcf_int); i++)
@@ -432,20 +435,6 @@ static void pcf50633_irq_worker(struct work_struct *work)
}
out:
- put_device(pcf->dev);
- enable_irq(pcf->irq);
-}
-
-static irqreturn_t pcf50633_irq(int irq, void *data)
-{
- struct pcf50633 *pcf = data;
-
- dev_dbg(pcf->dev, "pcf50633_irq\n");
-
- get_device(pcf->dev);
- disable_irq_nosync(pcf->irq);
- queue_work(pcf->work_queue, &pcf->irq_work);
-
return IRQ_HANDLED;
}
@@ -538,13 +527,9 @@ static int pcf50633_suspend(struct device *dev, pm_message_t state)
pcf = dev_get_drvdata(dev);
- /* Make sure our interrupt handlers are not called
- * henceforth */
+ /* Make sure our interrupt handlers are not called henceforth. */
disable_irq(pcf->irq);
- /* Make sure that any running IRQ worker has quit */
- cancel_work_sync(&pcf->irq_work);
-
/* Save the masks */
ret = pcf50633_read_block(pcf, PCF50633_REG_INT1M,
ARRAY_SIZE(pcf->suspend_irq_masks),
@@ -565,7 +550,7 @@ static int pcf50633_suspend(struct device *dev, pm_message_t state)
goto out;
}
- pcf->is_suspended = 1;
+ pcf->is_suspended = true;
out:
return ret;
@@ -573,11 +558,9 @@ out:
static int pcf50633_resume(struct device *dev)
{
- struct pcf50633 *pcf;
+ struct pcf50633 *pcf = dev_get_drvdata(dev);
int ret;
- pcf = dev_get_drvdata(dev);
-
/* Write the saved mask registers */
ret = pcf50633_write_block(pcf, PCF50633_REG_INT1M,
ARRAY_SIZE(pcf->suspend_irq_masks),
@@ -585,16 +568,11 @@ static int pcf50633_resume(struct device *dev)
if (ret < 0)
dev_err(pcf->dev, "Error restoring saved suspend masks\n");
- /* Restore regulators' state */
-
-
- get_device(pcf->dev);
-
/*
* Clear any pending interrupts and set resume reason if any.
- * This will leave with enable_irq()
*/
- pcf50633_irq_worker(&pcf->irq_work);
+ pcf50633_irq(pcf->irq, pcf);
+ enable_irq(pcf->irq);
return 0;
}
@@ -628,21 +606,12 @@ static int __devinit pcf50633_probe(struct i2c_client *client,
pcf->i2c_client = client;
pcf->irq = client->irq;
- pcf->work_queue = create_singlethread_workqueue("pcf50633");
- if (!pcf->work_queue) {
- dev_err(pcf->dev, "Failed to create workqueue\n");
- error = -ENOMEM;
- goto err_free_mem;
- }
-
- INIT_WORK(&pcf->irq_work, pcf50633_irq_worker);
-
version = pcf50633_reg_read(pcf, 0);
variant = pcf50633_reg_read(pcf, 1);
if (version < 0 || variant < 0) {
dev_err(pcf->dev, "Unable to probe pcf50633\n");
error = -ENODEV;
- goto err_destroy_wq;
+ goto err_free_mem;
}
dev_info(pcf->dev, "Probed device version %d variant %d\n",
@@ -682,8 +651,9 @@ static int __devinit pcf50633_probe(struct i2c_client *client,
goto err_free_pdevs;
}
- error = request_irq(client->irq, pcf50633_irq,
- IRQF_TRIGGER_LOW, "pcf50633", pcf);
+ error = request_threaded_irq(client->irq, NULL, pcf50633_irq,
+ IRQF_TRIGGER_LOW | IRQF_ONESHOT,
+ "pcf50633", pcf);
if (error) {
dev_err(pcf->dev, "Failed to request IRQ %d\n", error);
goto err_free_pdevs;
@@ -709,8 +679,6 @@ err_free_irq:
free_irq(pcf->irq, pcf);
err_free_pdevs:
pcf50633_unregister_sub_devices(pcf);
-err_destroy_wq:
- destroy_workqueue(pcf->work_queue);
err_free_mem:
kfree(pcf);
return error;
@@ -722,7 +690,6 @@ static int __devexit pcf50633_remove(struct i2c_client *client)
free_irq(pcf->irq, pcf);
- destroy_workqueue(pcf->work_queue);
pcf50633_unregister_sub_devices(pcf);
diff --git a/include/linux/mfd/pcf50633/core.h b/include/linux/mfd/pcf50633/core.h
index 0c21222..04990c4 100644
--- a/include/linux/mfd/pcf50633/core.h
+++ b/include/linux/mfd/pcf50633/core.h
@@ -13,8 +13,8 @@
#ifndef __LINUX_MFD_PCF50633_CORE_H
#define __LINUX_MFD_PCF50633_CORE_H
+#include <linux/types.h>
#include <linux/i2c.h>
-#include <linux/workqueue.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/power_supply.h>
@@ -141,15 +141,13 @@ struct pcf50633 {
struct pcf50633_platform_data *pdata;
int irq;
struct pcf50633_irq irq_handler[PCF50633_NUM_IRQ];
- struct work_struct irq_work;
- struct workqueue_struct *work_queue;
struct mutex lock;
u8 mask_regs[5];
u8 suspend_irq_masks[5];
u8 resume_reason[5];
- int is_suspended;
+ bool is_suspended;
int onkey1s_held;
--
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