[PATCH 3/4] lis3: use input_polled_device

Éric Piel
2009-05-21T09:35:46Z

Now that there is no need to hookup on the open/close of the joystick,
it's possible to use the simplified interface input_polled_device,
instead of creating our own kthread.

Signed-off-by: Éric Piel <eric.piel@tremplin-utc.net>
---
drivers/hwmon/hp_accel.c | 3 --
drivers/hwmon/lis3lv02d.c | 74 ++++++++++++++------------------------------
drivers/hwmon/lis3lv02d.h | 5 ++-
3 files changed, 27 insertions(+), 55 deletions(-)

diff --git a/drivers/hwmon/hp_accel.c b/drivers/hwmon/hp_accel.c
index 0ebd009..92db68e 100644
--- a/drivers/hwmon/hp_accel.c
+++ b/drivers/hwmon/hp_accel.c
@@ -27,9 +27,6 @@
#include <linux/types.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
-#include <linux/input.h>
-#include <linux/kthread.h>
-#include <linux/semaphore.h>
#include <linux/delay.h>
#include <linux/wait.h>
#include <linux/poll.h>
diff --git a/drivers/hwmon/lis3lv02d.c b/drivers/hwmon/lis3lv02d.c
index df3f586..3661906 100644
--- a/drivers/hwmon/lis3lv02d.c
+++ b/drivers/hwmon/lis3lv02d.c
@@ -27,9 +27,7 @@
#include <linux/types.h>
#include <linux/platform_device.h>
#include <linux/interrupt.h>
-#include <linux/input.h>
-#include <linux/kthread.h>
-#include <linux/semaphore.h>
+#include <linux/input-polldev.h>
#include <linux/delay.h>
#include <linux/wait.h>
#include <linux/poll.h>
@@ -270,43 +268,16 @@ static struct miscdevice lis3lv02d_misc_device = {
.fops = &lis3lv02d_misc_fops,
};

-/**
- * lis3lv02d_joystick_kthread - Kthread polling function
- * @data: unused - here to conform to threadfn prototype
- */
-static int lis3lv02d_joystick_kthread(void *data)
+static void lis3lv02d_joystick_poll(struct input_polled_dev *pidev)
{
int x, y, z;

- while (!kthread_should_stop()) {
- lis3lv02d_get_xyz(&lis3_dev, &x, &y, &z);
- input_report_abs(lis3_dev.idev, ABS_X, x - lis3_dev.xcalib);
- input_report_abs(lis3_dev.idev, ABS_Y, y - lis3_dev.ycalib);
- input_report_abs(lis3_dev.idev, ABS_Z, z - lis3_dev.zcalib);
-
- input_sync(lis3_dev.idev);
-
- try_to_freeze();
- msleep_interruptible(MDPS_POLL_INTERVAL);
- }
-
- return 0;
-}
-
-static int lis3lv02d_joystick_open(struct input_dev *input)
-{
- lis3_dev.kthread = kthread_run(lis3lv02d_joystick_kthread, NULL, "klis3lv02d");
- if (IS_ERR(lis3_dev.kthread)) {
- return PTR_ERR(lis3_dev.kthread);
- }
-
- return 0;
+ lis3lv02d_get_xyz(&lis3_dev, &x, &y, &z);
+ input_report_abs(pidev->input, ABS_X, x - lis3_dev.xcalib);
+ input_report_abs(pidev->input, ABS_Y, y - lis3_dev.ycalib);
+ input_report_abs(pidev->input, ABS_Z, z - lis3_dev.zcalib);
}

-static void lis3lv02d_joystick_close(struct input_dev *input)
-{
- kthread_stop(lis3_dev.kthread);
-}

static inline void lis3lv02d_calibrate_joystick(void)
{
@@ -316,33 +287,36 @@ static inline void lis3lv02d_calibrate_joystick(void)

int lis3lv02d_joystick_enable(void)
{
+ struct input_dev *input_dev;
int err;

if (lis3_dev.idev)
return -EINVAL;

- lis3_dev.idev = input_allocate_device();
+ lis3_dev.idev = input_allocate_polled_device();
if (!lis3_dev.idev)
return -ENOMEM;

+ lis3_dev.idev->poll = lis3lv02d_joystick_poll;
+ lis3_dev.idev->poll_interval = MDPS_POLL_INTERVAL;
+ input_dev = lis3_dev.idev->input;
+
lis3lv02d_calibrate_joystick();

- lis3_dev.idev->name = "ST LIS3LV02DL Accelerometer";
- lis3_dev.idev->phys = DRIVER_NAME "/input0";
- lis3_dev.idev->id.bustype = BUS_HOST;
- lis3_dev.idev->id.vendor = 0;
- lis3_dev.idev->dev.parent = &lis3_dev.pdev->dev;
- lis3_dev.idev->open = lis3lv02d_joystick_open;
- lis3_dev.idev->close = lis3lv02d_joystick_close;
+ input_dev->name = "ST LIS3LV02DL Accelerometer";
+ input_dev->phys = DRIVER_NAME "/input0";
+ input_dev->id.bustype = BUS_HOST;
+ input_dev->id.vendor = 0;
+ input_dev->dev.parent = &lis3_dev.pdev->dev;

- set_bit(EV_ABS, lis3_dev.idev->evbit);
- input_set_abs_params(lis3_dev.idev, ABS_X, -lis3_dev.mdps_max_val, lis3_dev.mdps_max_val, 3, 3);
- input_set_abs_params(lis3_dev.idev, ABS_Y, -lis3_dev.mdps_max_val, lis3_dev.mdps_max_val, 3, 3);
- input_set_abs_params(lis3_dev.idev, ABS_Z, -lis3_dev.mdps_max_val, lis3_dev.mdps_max_val, 3, 3);
+ set_bit(EV_ABS, input_dev->evbit);
+ input_set_abs_params(input_dev, ABS_X, -lis3_dev.mdps_max_val, lis3_dev.mdps_max_val, 3, 3);
+ input_set_abs_params(input_dev, ABS_Y, -lis3_dev.mdps_max_val, lis3_dev.mdps_max_val, 3, 3);
+ input_set_abs_params(input_dev, ABS_Z, -lis3_dev.mdps_max_val, lis3_dev.mdps_max_val, 3, 3);

- err = input_register_device(lis3_dev.idev);
+ err = input_register_polled_device(lis3_dev.idev);
if (err) {
- input_free_device(lis3_dev.idev);
+ input_free_polled_device(lis3_dev.idev);
lis3_dev.idev = NULL;
}

@@ -357,7 +331,7 @@ void lis3lv02d_joystick_disable(void)

if (lis3_dev.irq)
misc_deregister(&lis3lv02d_misc_device);
- input_unregister_device(lis3_dev.idev);
+ input_unregister_polled_device(lis3_dev.idev);
lis3_dev.idev = NULL;
}
EXPORT_SYMBOL_GPL(lis3lv02d_joystick_disable);
diff --git a/drivers/hwmon/lis3lv02d.h b/drivers/hwmon/lis3lv02d.h
index b007d81..5a5a196 100644
--- a/drivers/hwmon/lis3lv02d.h
+++ b/drivers/hwmon/lis3lv02d.h
@@ -18,6 +18,8 @@
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
+#include <linux/platform_device.h>
+#include <linux/input-polldev.h>

/*
* The actual chip is STMicroelectronics LIS3LV02DL or LIS3LV02DQ that seems to
@@ -169,8 +171,7 @@ struct lis3lv02d {
s16 (*read_data) (struct lis3lv02d *lis3, int reg);
int mdps_max_val;

- struct input_dev *idev; /* input device */
- struct task_struct *kthread; /* kthread for input */
+ struct input_polled_dev *idev; /* input device */
struct platform_device *pdev; /* platform device */
atomic_t count; /* interrupt count after last read */
int xcalib; /* calibrated null value for x */
--
1.6.2.4