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Message-Id: <1270533525-15312-5-git-send-email-samu.p.onkalo@nokia.com>
Date: Tue, 6 Apr 2010 08:58:43 +0300
From: Samu Onkalo <samu.p.onkalo@...ia.com>
To: eric.piel@...mplin-utc.net, akpm@...ux-foundation.org
Cc: linux-kernel@...r.kernel.org, Samu Onkalo <samu.p.onkalo@...ia.com>
Subject: [RESEND PATCH v2 4/6] lis3: Add skeletons for interrupt handlers
Original lis3 driver didn't provide interrupt handler(s) for
click or threshold event handling. This patch adds threaded handlers
for one or two interrupt lines for 8 bit device.
Actual content for interrupt handling is provided in the
separate patch.
Signed-off-by: Samu Onkalo <samu.p.onkalo@...ia.com>
Tested-by: Daniel Mack <daniel@...aq.de>
Acked-by: Éric Piel <eric.piel@...mplin-utc.net>
---
drivers/hwmon/lis3lv02d.c | 87 +++++++++++++++++++++++++++++++++------------
include/linux/lis3lv02d.h | 1 +
2 files changed, 65 insertions(+), 23 deletions(-)
diff --git a/drivers/hwmon/lis3lv02d.c b/drivers/hwmon/lis3lv02d.c
index 50f3123..3c06350 100644
--- a/drivers/hwmon/lis3lv02d.c
+++ b/drivers/hwmon/lis3lv02d.c
@@ -251,6 +251,9 @@ EXPORT_SYMBOL_GPL(lis3lv02d_poweron);
static irqreturn_t lis302dl_interrupt(int irq, void *dummy)
{
+ if (!test_bit(0, &lis3_dev.misc_opened))
+ goto out;
+
/*
* Be careful: on some HP laptops the bios force DD when on battery and
* the lid is closed. This leads to interrupts as soon as a little move
@@ -260,44 +263,35 @@ static irqreturn_t lis302dl_interrupt(int irq, void *dummy)
wake_up_interruptible(&lis3_dev.misc_wait);
kill_fasync(&lis3_dev.async_queue, SIGIO, POLL_IN);
+out:
+ if (lis3_dev.whoami == WAI_8B && lis3_dev.idev &&
+ lis3_dev.idev->input->users)
+ return IRQ_WAKE_THREAD;
return IRQ_HANDLED;
}
-static int lis3lv02d_misc_open(struct inode *inode, struct file *file)
+static irqreturn_t lis302dl_interrupt_thread1_8b(int irq, void *data)
{
- int ret;
+ return IRQ_HANDLED;
+}
+static irqreturn_t lis302dl_interrupt_thread2_8b(int irq, void *data)
+{
+ return IRQ_HANDLED;
+}
+
+static int lis3lv02d_misc_open(struct inode *inode, struct file *file)
+{
if (test_and_set_bit(0, &lis3_dev.misc_opened))
return -EBUSY; /* already open */
atomic_set(&lis3_dev.count, 0);
-
- /*
- * The sensor can generate interrupts for free-fall and direction
- * detection (distinguishable with FF_WU_SRC and DD_SRC) but to keep
- * the things simple and _fast_ we activate it only for free-fall, so
- * no need to read register (very slow with ACPI). For the same reason,
- * we forbid shared interrupts.
- *
- * IRQF_TRIGGER_RISING seems pointless on HP laptops because the
- * io-apic is not configurable (and generates a warning) but I keep it
- * in case of support for other hardware.
- */
- ret = request_irq(lis3_dev.irq, lis302dl_interrupt, IRQF_TRIGGER_RISING,
- DRIVER_NAME, &lis3_dev);
-
- if (ret) {
- clear_bit(0, &lis3_dev.misc_opened);
- printk(KERN_ERR DRIVER_NAME ": IRQ%d allocation failed\n", lis3_dev.irq);
- return -EBUSY;
- }
return 0;
}
static int lis3lv02d_misc_release(struct inode *inode, struct file *file)
{
fasync_helper(-1, file, 0, &lis3_dev.async_queue);
- free_irq(lis3_dev.irq, &lis3_dev);
clear_bit(0, &lis3_dev.misc_opened); /* release the device */
return 0;
}
@@ -434,6 +428,11 @@ EXPORT_SYMBOL_GPL(lis3lv02d_joystick_enable);
void lis3lv02d_joystick_disable(void)
{
+ if (lis3_dev.irq)
+ free_irq(lis3_dev.irq, &lis3_dev);
+ if (lis3_dev.pdata && lis3_dev.pdata->irq2)
+ free_irq(lis3_dev.pdata->irq2, &lis3_dev);
+
if (!lis3_dev.idev)
return;
@@ -524,6 +523,7 @@ EXPORT_SYMBOL_GPL(lis3lv02d_remove_fs);
static void lis3lv02d_8b_configure(struct lis3lv02d *dev,
struct lis3lv02d_platform_data *p)
{
+ int err;
int ctrl2 = p->hipass_ctrl;
if (p->click_flags) {
@@ -554,6 +554,18 @@ static void lis3lv02d_8b_configure(struct lis3lv02d *dev,
}
/* Configure hipass filters */
dev->write(dev, CTRL_REG2, ctrl2);
+
+ if (p->irq2) {
+ err = request_threaded_irq(p->irq2,
+ NULL,
+ lis302dl_interrupt_thread2_8b,
+ IRQF_TRIGGER_RISING |
+ IRQF_ONESHOT,
+ DRIVER_NAME, &lis3_dev);
+ if (err < 0)
+ printk(KERN_ERR DRIVER_NAME
+ "No second IRQ. Limited functionality\n");
+ }
}
/*
@@ -562,6 +574,9 @@ static void lis3lv02d_8b_configure(struct lis3lv02d *dev,
*/
int lis3lv02d_init_device(struct lis3lv02d *dev)
{
+ int err;
+ irq_handler_t thread_fn;
+
dev->whoami = lis3lv02d_read_8(dev, WHO_AM_I);
switch (dev->whoami) {
@@ -616,6 +631,32 @@ int lis3lv02d_init_device(struct lis3lv02d *dev)
goto out;
}
+ /*
+ * The sensor can generate interrupts for free-fall and direction
+ * detection (distinguishable with FF_WU_SRC and DD_SRC) but to keep
+ * the things simple and _fast_ we activate it only for free-fall, so
+ * no need to read register (very slow with ACPI). For the same reason,
+ * we forbid shared interrupts.
+ *
+ * IRQF_TRIGGER_RISING seems pointless on HP laptops because the
+ * io-apic is not configurable (and generates a warning) but I keep it
+ * in case of support for other hardware.
+ */
+ if (dev->whoami == WAI_8B)
+ thread_fn = lis302dl_interrupt_thread1_8b;
+ else
+ thread_fn = NULL;
+
+ err = request_threaded_irq(dev->irq, lis302dl_interrupt,
+ thread_fn,
+ IRQF_TRIGGER_RISING | IRQF_ONESHOT,
+ DRIVER_NAME, &lis3_dev);
+
+ if (err < 0) {
+ printk(KERN_ERR DRIVER_NAME "Cannot get IRQ\n");
+ goto out;
+ }
+
if (misc_register(&lis3lv02d_misc_device))
printk(KERN_ERR DRIVER_NAME ": misc_register failed\n");
out:
diff --git a/include/linux/lis3lv02d.h b/include/linux/lis3lv02d.h
index d625199..fd289b1 100644
--- a/include/linux/lis3lv02d.h
+++ b/include/linux/lis3lv02d.h
@@ -67,6 +67,7 @@ struct lis3lv02d_platform_data {
/* Limits for selftest are specified in chip data sheet */
s16 st_min_limits[3]; /* min pass limit x, y, z */
s16 st_max_limits[3]; /* max pass limit x, y, z */
+ int irq2;
};
#endif /* __LIS3LV02D_H_ */
--
1.6.0.4
--
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