Input: ati_remote - use msec instead of jiffies

By using milliseconds instead of jiffies to calculate acceleration
factor we make the code immune to changes in HZ.

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

1 files changed, 77 insertions, 58 deletions

diff --git a/drivers/usb/input/ati_remote.c b/drivers/usb/input/ati_remote.c
index 5a56f6cb36a8..3719fcb04b8f 100644
--- a/drivers/usb/input/ati_remote.c
+++ b/drivers/usb/input/ati_remote.c
@@ -157,9 +157,6 @@ MODULE_DEVICE_TABLE(usb, ati_remote_table);
 static char init1[] = { 0x01, 0x00, 0x20, 0x14 };
 static char init2[] = { 0x01, 0x00, 0x20, 0x14, 0x20, 0x20, 0x20 };
 
-/* Acceleration curve for directional control pad */
-static const char accel[] = { 1, 2, 4, 6, 9, 13, 20 };
-
 struct ati_remote {
         struct input_dev *idev;
         struct usb_device *udev;
@@ -417,6 +414,43 @@ static int ati_remote_event_lookup(int rem, unsigned char d1, unsigned char d2)
 }
 
 /*
+ *      ati_remote_compute_accel
+ *
+ * Implements acceleration curve for directional control pad
+ * If elapsed time since last event is > 1/4 second, user "stopped",
+ * so reset acceleration. Otherwise, user is probably holding the control
+ * pad down, so we increase acceleration, ramping up over two seconds to
+ * a maximum speed.
+ */
+static int ati_remote_compute_accel(struct ati_remote *ati_remote)
+{
+        static const char accel[] = { 1, 2, 4, 6, 9, 13, 20 };
+        unsigned long now = jiffies;
+        int acc;
+
+        if (time_after(now, ati_remote->old_jiffies + msecs_to_jiffies(250))) {
+                acc = 1;
+                ati_remote->acc_jiffies = now;
+        }
+        else if (time_before(now, ati_remote->acc_jiffies + msecs_to_jiffies(125)))
+                acc = accel[0];
+        else if (time_before(now, ati_remote->acc_jiffies + msecs_to_jiffies(250)))
+                acc = accel[1];
+        else if (time_before(now, ati_remote->acc_jiffies + msecs_to_jiffies(500)))
+                acc = accel[2];
+        else if (time_before(now, ati_remote->acc_jiffies + msecs_to_jiffies(1000)))
+                acc = accel[3];
+        else if (time_before(now, ati_remote->acc_jiffies + msecs_to_jiffies(1500)))
+                acc = accel[4];
+        else if (time_before(now, ati_remote->acc_jiffies + msecs_to_jiffies(2000)))
+                acc = accel[5];
+        else
+                acc = accel[6];
+
+        return acc;
+}
+
+/*
  *      ati_remote_report_input
  */
 static void ati_remote_input_report(struct urb *urb, struct pt_regs *regs)
@@ -494,63 +528,48 @@ static void ati_remote_input_report(struct urb *urb, struct pt_regs *regs)
                         ati_remote_tbl[index].code, 0);
                 input_sync(dev);
 
-                return;
-        }
+        } else {
 
-        /*
-         * Other event kinds are from the directional control pad, and have an
-         * acceleration factor applied to them.  Without this acceleration, the
-         * control pad is mostly unusable.
-         *
-         * If elapsed time since last event is > 1/4 second, user "stopped",
-         * so reset acceleration. Otherwise, user is probably holding the control
-         * pad down, so we increase acceleration, ramping up over two seconds to
-         * a maximum speed.  The acceleration curve is #defined above.
-         */
-        if (time_after(jiffies, ati_remote->old_jiffies + (HZ >> 2))) {
-                acc = 1;
-                ati_remote->acc_jiffies = jiffies;
-        }
-        else if (time_before(jiffies, ati_remote->acc_jiffies + (HZ >> 3)))  acc = accel[0];
-        else if (time_before(jiffies, ati_remote->acc_jiffies + (HZ >> 2)))  acc = accel[1];
-        else if (time_before(jiffies, ati_remote->acc_jiffies + (HZ >> 1)))  acc = accel[2];
-        else if (time_before(jiffies, ati_remote->acc_jiffies + HZ))         acc = accel[3];
-        else if (time_before(jiffies, ati_remote->acc_jiffies + HZ+(HZ>>1))) acc = accel[4];
-        else if (time_before(jiffies, ati_remote->acc_jiffies + (HZ << 1)))  acc = accel[5];
-        else acc = accel[6];
-
-        input_regs(dev, regs);
-        switch (ati_remote_tbl[index].kind) {
-        case KIND_ACCEL:
-                input_event(dev, ati_remote_tbl[index].type,
-                        ati_remote_tbl[index].code,
-                        ati_remote_tbl[index].value * acc);
-                break;
-        case KIND_LU:
-                input_report_rel(dev, REL_X, -acc);
-                input_report_rel(dev, REL_Y, -acc);
-                break;
-        case KIND_RU:
-                input_report_rel(dev, REL_X, acc);
-                input_report_rel(dev, REL_Y, -acc);
-                break;
-        case KIND_LD:
-                input_report_rel(dev, REL_X, -acc);
-                input_report_rel(dev, REL_Y, acc);
-                break;
-        case KIND_RD:
-                input_report_rel(dev, REL_X, acc);
-                input_report_rel(dev, REL_Y, acc);
-                break;
-        default:
-                dev_dbg(&ati_remote->interface->dev, "ati_remote kind=%d\n",
-                        ati_remote_tbl[index].kind);
-        }
-        input_sync(dev);
+                /*
+                 * Other event kinds are from the directional control pad, and have an
+                 * acceleration factor applied to them.  Without this acceleration, the
+                 * control pad is mostly unusable.
+                 */
+                acc = ati_remote_compute_accel(ati_remote);
 
-        ati_remote->old_jiffies = jiffies;
-        ati_remote->old_data[0] = data[1];
-        ati_remote->old_data[1] = data[2];
+                input_regs(dev, regs);
+                switch (ati_remote_tbl[index].kind) {
+                case KIND_ACCEL:
+                        input_event(dev, ati_remote_tbl[index].type,
+                                ati_remote_tbl[index].code,
+                                ati_remote_tbl[index].value * acc);
+                        break;
+                case KIND_LU:
+                        input_report_rel(dev, REL_X, -acc);
+                        input_report_rel(dev, REL_Y, -acc);
+                        break;
+                case KIND_RU:
+                        input_report_rel(dev, REL_X, acc);
+                        input_report_rel(dev, REL_Y, -acc);
+                        break;
+                case KIND_LD:
+                        input_report_rel(dev, REL_X, -acc);
+                        input_report_rel(dev, REL_Y, acc);
+                        break;
+                case KIND_RD:
+                        input_report_rel(dev, REL_X, acc);
+                        input_report_rel(dev, REL_Y, acc);
+                        break;
+                default:
+                        dev_dbg(&ati_remote->interface->dev, "ati_remote kind=%d\n",
+                                ati_remote_tbl[index].kind);
+                }
+                input_sync(dev);
+
+                ati_remote->old_jiffies = jiffies;
+                ati_remote->old_data[0] = data[1];
+                ati_remote->old_data[1] = data[2];
+        }
 }
 
 /*