Imported Upstream version 4.2-build2006upstream/4.2-build2006upstream

1 files changed, 204 insertions, 0 deletions

diff --git a/kernel/framework/midi/oss_default_timer.c b/kernel/framework/midi/oss_default_timer.c
new file mode 100644
index 0000000..ee09601
--- /dev/null
+++ b/kernel/framework/midi/oss_default_timer.c
@@ -0,0 +1,204 @@
+/*
+ * Purpose: Default MIDI timer (using system clock)
+ */
+/*
+ *
+ * This file is part of Open Sound System.
+ *
+ * Copyright (C) 4Front Technologies 1996-2008.
+ *
+ * This this source file is released under GPL v2 license (no other versions).
+ * See the COPYING file included in the main directory of this source
+ * distribution for the license terms and conditions.
+ *
+ */
+
+#include "oss_config.h"
+#include "midi_core.h"
+
+typedef struct
+{
+  unsigned long long start_time;
+  timeout_id_t timeout_id;
+  oss_midi_wait_callback_t timer_callback;
+  void *arg;
+} deftmr_timerc_t;
+
+static unsigned long long tick_scale = 1;
+
+static int
+deftmr_create_instance (int timer_dev, int driver_dev)
+{
+  deftmr_timerc_t *timerc;
+
+  if ((timerc = KERNEL_MALLOC (sizeof (*timerc))) == NULL)
+    return OSS_ENOMEM;
+
+  memset (timerc, 0, sizeof (*timerc));
+
+  oss_timer_devs[timer_dev]->timerc = timerc;
+
+  return 0;
+}
+
+static void
+deftmr_free_instance (int timer_dev, int driver_dev)
+{
+  deftmr_timerc_t *timerc;
+
+  timerc = oss_timer_devs[timer_dev]->timerc;
+  untimeout (timerc->timeout_id);
+
+  if (timerc != NULL)
+    KERNEL_FREE (timerc);
+  oss_timer_devs[timer_dev]->timerc = NULL;
+}
+
+static int
+deftmr_attach_client (int timer_dev, int mididev)
+{
+  return 0;
+}
+
+static void
+deftmr_detach_client (int timer_dev, int mididev)
+{
+}
+
+static int
+deftmr_ioctl (int timer_dev, unsigned int cmd, ioctl_arg arg)
+{
+  return OSS_EINVAL;
+}
+
+static int
+deftmr_set_source (int timer_dev, int source)
+{
+  return source;
+}
+
+static int
+deftmr_set_tempo (int timer_dev, int tempo)
+{
+  return tempo;
+}
+
+static int
+deftmr_set_timebase (int timer_dev, int timebase)
+{
+  return timebase;
+}
+static int
+deftmr_start (int timer_dev, oss_uint64_t tick)
+{
+  deftmr_timerc_t *timerc;
+
+  timerc = oss_timer_devs[timer_dev]->timerc;
+
+  if (timerc == NULL)
+    {
+      cmn_err (CE_WARN, "deftmr_start: timerc==NULL\n");
+      return OSS_EIO;
+    }
+
+  timerc->start_time = GET_JIFFIES ();
+  return 0;
+}
+
+static int
+deftmr_stop (int timer_dev)
+{
+  deftmr_timerc_t *timerc;
+
+  timerc = oss_timer_devs[timer_dev]->timerc;
+  untimeout (timerc->timeout_id);
+
+  return 0;
+}
+
+static int
+deftmr_cont (int timer_dev)
+{
+  return 0;
+}
+
+static int
+deftmr_wait (int timer_dev, unsigned long long time,
+	     oss_midi_wait_callback_t callback, void *arg)
+{
+  deftmr_timerc_t *timerc;
+  unsigned long long t;
+
+  timerc = oss_timer_devs[timer_dev]->timerc;
+  untimeout (timerc->timeout_id);
+
+  t = ((oss_uint64_t) time + (tick_scale / 2)) / tick_scale;
+
+  t += timerc->start_time;
+
+  t -= GET_JIFFIES ();
+
+  if (t < 0)
+    {
+      return 1;
+    }
+
+  timerc->timeout_id = timeout (callback, arg, t);
+
+  return 0;
+}
+
+static unsigned long long
+deftmr_get_current_time (int timer_dev)
+{
+  unsigned long long t;
+  deftmr_timerc_t *timerc;
+
+  timerc = oss_timer_devs[timer_dev]->timerc;
+  /*
+   * Compute time in system ticks since start of the timer
+   */
+  t = GET_JIFFIES ();
+  if (t < timerc->start_time)
+    return 0;
+  t -= timerc->start_time;
+
+  return t * tick_scale;	/* In microseconds */
+}
+
+oss_timer_driver_t default_midi_driver = {
+  deftmr_create_instance,
+  deftmr_free_instance,
+  deftmr_attach_client,
+  deftmr_detach_client,
+  deftmr_ioctl,
+  deftmr_wait,
+  deftmr_get_current_time,
+  deftmr_set_source,
+  deftmr_set_tempo,
+  deftmr_set_timebase,
+  deftmr_start,
+  deftmr_stop,
+  deftmr_cont
+};
+
+void
+attach_oss_default_timer (oss_device_t * osdev)
+{
+  int timer_dev;
+
+  tick_scale = 1000000 / OSS_HZ;
+  if ((timer_dev = oss_install_timer (OSS_TIMER_DRIVER_VERSION, "System timer", &default_midi_driver, sizeof (oss_timer_driver_t), 0,	/* Flags */
+				      16,	/* max_instances */
+				      1000000 / OSS_HZ,	/* Resolution */
+				      NULL, osdev)) < 0)
+    {
+      cmn_err (CE_WARN, "Failed to install default MIDI timer\n");
+      return;
+    }
+}
+
+void
+detach_oss_default_timer ()
+{
+}