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Diffstat (limited to 'sound/pci/hda/hda_beep.c')
-rw-r--r--sound/pci/hda/hda_beep.c134
1 files changed, 134 insertions, 0 deletions
diff --git a/sound/pci/hda/hda_beep.c b/sound/pci/hda/hda_beep.c
new file mode 100644
index 00000000000..9b77b3e0fa9
--- /dev/null
+++ b/sound/pci/hda/hda_beep.c
@@ -0,0 +1,134 @@
+/*
+ * Digital Beep Input Interface for HD-audio codec
+ *
+ * Author: Matthew Ranostay <mranostay@embeddedalley.com>
+ * Copyright (c) 2008 Embedded Alley Solutions Inc
+ *
+ * This driver is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This driver is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * 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/input.h>
+#include <linux/pci.h>
+#include <linux/workqueue.h>
+#include <sound/core.h>
+#include "hda_beep.h"
+
+enum {
+ DIGBEEP_HZ_STEP = 46875, /* 46.875 Hz */
+ DIGBEEP_HZ_MIN = 93750, /* 93.750 Hz */
+ DIGBEEP_HZ_MAX = 12000000, /* 12 KHz */
+};
+
+static void snd_hda_generate_beep(struct work_struct *work)
+{
+ struct hda_beep *beep =
+ container_of(work, struct hda_beep, beep_work);
+ struct hda_codec *codec = beep->codec;
+
+ /* generate tone */
+ snd_hda_codec_write_cache(codec, beep->nid, 0,
+ AC_VERB_SET_BEEP_CONTROL, beep->tone);
+}
+
+static int snd_hda_beep_event(struct input_dev *dev, unsigned int type,
+ unsigned int code, int hz)
+{
+ struct hda_beep *beep = input_get_drvdata(dev);
+
+ switch (code) {
+ case SND_BELL:
+ if (hz)
+ hz = 1000;
+ case SND_TONE:
+ hz *= 1000; /* fixed point */
+ hz = hz - DIGBEEP_HZ_MIN;
+ if (hz < 0)
+ hz = 0; /* turn off PC beep*/
+ else if (hz >= (DIGBEEP_HZ_MAX - DIGBEEP_HZ_MIN))
+ hz = 0xff;
+ else {
+ hz /= DIGBEEP_HZ_STEP;
+ hz++;
+ }
+ break;
+ default:
+ return -1;
+ }
+ beep->tone = hz;
+
+ /* schedule beep event */
+ schedule_work(&beep->beep_work);
+ return 0;
+}
+
+int snd_hda_attach_beep_device(struct hda_codec *codec, int nid)
+{
+ struct input_dev *input_dev;
+ struct hda_beep *beep;
+ int err;
+
+ beep = kzalloc(sizeof(*beep), GFP_KERNEL);
+ if (beep == NULL)
+ return -ENOMEM;
+ snprintf(beep->phys, sizeof(beep->phys),
+ "card%d/codec#%d/beep0", codec->bus->card->number, codec->addr);
+ input_dev = input_allocate_device();
+
+ /* setup digital beep device */
+ input_dev->name = "HDA Digital PCBeep";
+ input_dev->phys = beep->phys;
+ input_dev->id.bustype = BUS_PCI;
+
+ input_dev->id.vendor = codec->vendor_id >> 16;
+ input_dev->id.product = codec->vendor_id & 0xffff;
+ input_dev->id.version = 0x01;
+
+ input_dev->evbit[0] = BIT_MASK(EV_SND);
+ input_dev->sndbit[0] = BIT_MASK(SND_BELL) | BIT_MASK(SND_TONE);
+ input_dev->event = snd_hda_beep_event;
+ input_dev->dev.parent = &codec->bus->pci->dev;
+ input_set_drvdata(input_dev, beep);
+
+ err = input_register_device(input_dev);
+ if (err < 0) {
+ input_free_device(input_dev);
+ kfree(beep);
+ return err;
+ }
+
+ /* enable linear scale */
+ snd_hda_codec_write(codec, nid, 0,
+ AC_VERB_SET_DIGI_CONVERT_2, 0x01);
+
+ beep->nid = nid;
+ beep->dev = input_dev;
+ beep->codec = codec;
+ codec->beep = beep;
+
+ INIT_WORK(&beep->beep_work, &snd_hda_generate_beep);
+ return 0;
+}
+
+void snd_hda_detach_beep_device(struct hda_codec *codec)
+{
+ struct hda_beep *beep = codec->beep;
+ if (beep) {
+ cancel_work_sync(&beep->beep_work);
+ flush_scheduled_work();
+
+ input_unregister_device(beep->dev);
+ kfree(beep);
+ }
+}