HWMON: hdaps - switch to using input-polldev

Switch to using input-polldev skeleton instead of implementing polling loop
by itself.  This also fixes problem with trylock on a mutex in atomic
context.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 24 insertions, 31 deletions

diff --git a/drivers/hwmon/hdaps.c b/drivers/hwmon/hdaps.c
index a7c6d407572b..8a7ae03aeee4 100644
--- a/drivers/hwmon/hdaps.c
+++ b/drivers/hwmon/hdaps.c
@@ -28,7 +28,7 @@
 
 #include <linux/delay.h>
 #include <linux/platform_device.h>
-#include <linux/input.h>
+#include <linux/input-polldev.h>
 #include <linux/kernel.h>
 #include <linux/mutex.h>
 #include <linux/module.h>
@@ -61,13 +61,12 @@
 #define INIT_TIMEOUT_MSECS      4000    /* wait up to 4s for device init ... */
 #define INIT_WAIT_MSECS         200     /* ... in 200ms increments */
 
-#define HDAPS_POLL_PERIOD       (HZ/20) /* poll for input every 1/20s */
+#define HDAPS_POLL_INTERVAL     50      /* poll for input every 1/20s (50 ms)*/
 #define HDAPS_INPUT_FUZZ        4       /* input event threshold */
 #define HDAPS_INPUT_FLAT        4
 
-static struct timer_list hdaps_timer;
 static struct platform_device *pdev;
-static struct input_dev *hdaps_idev;
+static struct input_polled_dev *hdaps_idev;
 static unsigned int hdaps_invert;
 static u8 km_activity;
 static int rest_x;
@@ -323,24 +322,19 @@ static void hdaps_calibrate(void)
         __hdaps_read_pair(HDAPS_PORT_XPOS, HDAPS_PORT_YPOS, &rest_x, &rest_y);
 }
 
-static void hdaps_mousedev_poll(unsigned long unused)
+static void hdaps_mousedev_poll(struct input_polled_dev *dev)
 {
+        struct input_dev *input_dev = dev->input;
         int x, y;
 
-        /* Cannot sleep.  Try nonblockingly.  If we fail, try again later. */
-        if (mutex_trylock(&hdaps_mtx)) {
-                mod_timer(&hdaps_timer,jiffies + HDAPS_POLL_PERIOD);
-                return;
-        }
+        mutex_lock(&hdaps_mtx);
 
         if (__hdaps_read_pair(HDAPS_PORT_XPOS, HDAPS_PORT_YPOS, &x, &y))
                 goto out;
 
-        input_report_abs(hdaps_idev, ABS_X, x - rest_x);
-        input_report_abs(hdaps_idev, ABS_Y, y - rest_y);
-        input_sync(hdaps_idev);
-
-        mod_timer(&hdaps_timer, jiffies + HDAPS_POLL_PERIOD);
+        input_report_abs(input_dev, ABS_X, x - rest_x);
+        input_report_abs(input_dev, ABS_Y, y - rest_y);
+        input_sync(input_dev);
 
 out:
         mutex_unlock(&hdaps_mtx);
@@ -536,6 +530,7 @@ static struct dmi_system_id __initdata hdaps_whitelist[] = {
 
 static int __init hdaps_init(void)
 {
+        struct input_dev *idev;
         int ret;
 
         if (!dmi_check_system(hdaps_whitelist)) {
@@ -563,39 +558,37 @@ static int __init hdaps_init(void)
         if (ret)
                 goto out_device;
 
-        hdaps_idev = input_allocate_device();
+        hdaps_idev = input_allocate_polled_device();
         if (!hdaps_idev) {
                 ret = -ENOMEM;
                 goto out_group;
         }
 
+        hdaps_idev->poll = hdaps_mousedev_poll;
+        hdaps_idev->poll_interval = HDAPS_POLL_INTERVAL;
+
         /* initial calibrate for the input device */
         hdaps_calibrate();
 
         /* initialize the input class */
-        hdaps_idev->name = "hdaps";
-        hdaps_idev->dev.parent = &pdev->dev;
-        hdaps_idev->evbit[0] = BIT(EV_ABS);
-        input_set_abs_params(hdaps_idev, ABS_X,
+        idev = hdaps_idev->input;
+        idev->name = "hdaps";
+        idev->dev.parent = &pdev->dev;
+        idev->evbit[0] = BIT(EV_ABS);
+        input_set_abs_params(idev, ABS_X,
                         -256, 256, HDAPS_INPUT_FUZZ, HDAPS_INPUT_FLAT);
-        input_set_abs_params(hdaps_idev, ABS_Y,
+        input_set_abs_params(idev, ABS_Y,
                         -256, 256, HDAPS_INPUT_FUZZ, HDAPS_INPUT_FLAT);
 
-        ret = input_register_device(hdaps_idev);
+        ret = input_register_polled_device(hdaps_idev);
         if (ret)
                 goto out_idev;
 
-        /* start up our timer for the input device */
-        init_timer(&hdaps_timer);
-        hdaps_timer.function = hdaps_mousedev_poll;
-        hdaps_timer.expires = jiffies + HDAPS_POLL_PERIOD;
-        add_timer(&hdaps_timer);
-
         printk(KERN_INFO "hdaps: driver successfully loaded.\n");
         return 0;
 
 out_idev:
-        input_free_device(hdaps_idev);
+        input_free_polled_device(hdaps_idev);
 out_group:
         sysfs_remove_group(&pdev->dev.kobj, &hdaps_attribute_group);
 out_device:
@@ -611,8 +604,8 @@ out:
 
 static void __exit hdaps_exit(void)
 {
-        del_timer_sync(&hdaps_timer);
-        input_unregister_device(hdaps_idev);
+        input_unregister_polled_device(hdaps_idev);
+        input_free_polled_device(hdaps_idev);
         sysfs_remove_group(&pdev->dev.kobj, &hdaps_attribute_group);
         platform_device_unregister(pdev);
         platform_driver_unregister(&hdaps_driver);