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-rw-r--r--sound/i2c/other/pt2258.c233
1 files changed, 233 insertions, 0 deletions
diff --git a/sound/i2c/other/pt2258.c b/sound/i2c/other/pt2258.c
new file mode 100644
index 000000000000..e91cc3b44de5
--- /dev/null
+++ b/sound/i2c/other/pt2258.c
@@ -0,0 +1,233 @@
+/*
+ * ALSA Driver for the PT2258 volume controller.
+ *
+ * Copyright (c) 2006 Jochen Voss <voss@seehuhn.de>
+ *
+ * This program 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 program 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 <sound/driver.h>
+#include <sound/core.h>
+#include <sound/control.h>
+#include <sound/tlv.h>
+#include <sound/i2c.h>
+#include <sound/pt2258.h>
+
+MODULE_AUTHOR("Jochen Voss <voss@seehuhn.de>");
+MODULE_DESCRIPTION("PT2258 volume controller (Princeton Technology Corp.)");
+MODULE_LICENSE("GPL");
+
+#define PT2258_CMD_RESET 0xc0
+#define PT2258_CMD_UNMUTE 0xf8
+#define PT2258_CMD_MUTE 0xf9
+
+static const unsigned char pt2258_channel_code[12] = {
+ 0x80, 0x90, /* channel 1: -10dB, -1dB */
+ 0x40, 0x50, /* channel 2: -10dB, -1dB */
+ 0x00, 0x10, /* channel 3: -10dB, -1dB */
+ 0x20, 0x30, /* channel 4: -10dB, -1dB */
+ 0x60, 0x70, /* channel 5: -10dB, -1dB */
+ 0xa0, 0xb0 /* channel 6: -10dB, -1dB */
+};
+
+int snd_pt2258_reset(struct snd_pt2258 *pt)
+{
+ unsigned char bytes[2];
+ int i;
+
+ /* reset chip */
+ bytes[0] = PT2258_CMD_RESET;
+ snd_i2c_lock(pt->i2c_bus);
+ if (snd_i2c_sendbytes(pt->i2c_dev, bytes, 1) != 1)
+ goto __error;
+ snd_i2c_unlock(pt->i2c_bus);
+
+ /* mute all channels */
+ pt->mute = 1;
+ bytes[0] = PT2258_CMD_MUTE;
+ snd_i2c_lock(pt->i2c_bus);
+ if (snd_i2c_sendbytes(pt->i2c_dev, bytes, 1) != 1)
+ goto __error;
+ snd_i2c_unlock(pt->i2c_bus);
+
+ /* set all channels to 0dB */
+ for (i = 0; i < 6; ++i)
+ pt->volume[i] = 0;
+ bytes[0] = 0xd0;
+ bytes[1] = 0xe0;
+ snd_i2c_lock(pt->i2c_bus);
+ if (snd_i2c_sendbytes(pt->i2c_dev, bytes, 2) != 2)
+ goto __error;
+ snd_i2c_unlock(pt->i2c_bus);
+
+ return 0;
+
+ __error:
+ snd_i2c_unlock(pt->i2c_bus);
+ snd_printk(KERN_ERR "PT2258 reset failed\n");
+ return -EIO;
+}
+
+static int pt2258_stereo_volume_info(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_info *uinfo)
+{
+ uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
+ uinfo->count = 2;
+ uinfo->value.integer.min = 0;
+ uinfo->value.integer.max = 79;
+ return 0;
+}
+
+static int pt2258_stereo_volume_get(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *ucontrol)
+{
+ struct snd_pt2258 *pt = kcontrol->private_data;
+ int base = kcontrol->private_value;
+
+ /* chip does not support register reads */
+ ucontrol->value.integer.value[0] = 79 - pt->volume[base];
+ ucontrol->value.integer.value[1] = 79 - pt->volume[base + 1];
+ return 0;
+}
+
+static int pt2258_stereo_volume_put(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *ucontrol)
+{
+ struct snd_pt2258 *pt = kcontrol->private_data;
+ int base = kcontrol->private_value;
+ unsigned char bytes[2];
+ int val0, val1;
+
+ val0 = 79 - ucontrol->value.integer.value[0];
+ val1 = 79 - ucontrol->value.integer.value[1];
+ if (val0 == pt->volume[base] && val1 == pt->volume[base + 1])
+ return 0;
+
+ pt->volume[base] = val0;
+ bytes[0] = pt2258_channel_code[2 * base] | (val0 / 10);
+ bytes[1] = pt2258_channel_code[2 * base + 1] | (val0 % 10);
+ snd_i2c_lock(pt->i2c_bus);
+ if (snd_i2c_sendbytes(pt->i2c_dev, bytes, 2) != 2)
+ goto __error;
+ snd_i2c_unlock(pt->i2c_bus);
+
+ pt->volume[base + 1] = val1;
+ bytes[0] = pt2258_channel_code[2 * base + 2] | (val1 / 10);
+ bytes[1] = pt2258_channel_code[2 * base + 3] | (val1 % 10);
+ snd_i2c_lock(pt->i2c_bus);
+ if (snd_i2c_sendbytes(pt->i2c_dev, bytes, 2) != 2)
+ goto __error;
+ snd_i2c_unlock(pt->i2c_bus);
+
+ return 1;
+
+ __error:
+ snd_i2c_unlock(pt->i2c_bus);
+ snd_printk(KERN_ERR "PT2258 access failed\n");
+ return -EIO;
+}
+
+static int pt2258_switch_info(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_info *uinfo)
+{
+ uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
+ uinfo->count = 1;
+ uinfo->value.integer.min = 0;
+ uinfo->value.integer.max = 1;
+ return 0;
+}
+
+static int pt2258_switch_get(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *ucontrol)
+{
+ struct snd_pt2258 *pt = kcontrol->private_data;
+
+ ucontrol->value.integer.value[0] = !pt->mute;
+ return 0;
+}
+
+static int pt2258_switch_put(struct snd_kcontrol *kcontrol,
+ struct snd_ctl_elem_value *ucontrol)
+{
+ struct snd_pt2258 *pt = kcontrol->private_data;
+ unsigned char bytes[2];
+ int val;
+
+ val = !ucontrol->value.integer.value[0];
+ if (pt->mute == val)
+ return 0;
+
+ pt->mute = val;
+ bytes[0] = val ? PT2258_CMD_MUTE : PT2258_CMD_UNMUTE;
+ snd_i2c_lock(pt->i2c_bus);
+ if (snd_i2c_sendbytes(pt->i2c_dev, bytes, 1) != 1)
+ goto __error;
+ snd_i2c_unlock(pt->i2c_bus);
+
+ return 1;
+
+ __error:
+ snd_i2c_unlock(pt->i2c_bus);
+ snd_printk(KERN_ERR "PT2258 access failed 2\n");
+ return -EIO;
+}
+
+static const DECLARE_TLV_DB_SCALE(pt2258_db_scale, -7900, 100, 0);
+
+int snd_pt2258_build_controls(struct snd_pt2258 *pt)
+{
+ struct snd_kcontrol_new knew;
+ char *names[3] = {
+ "Mic Loopback Playback Volume",
+ "Line Loopback Playback Volume",
+ "CD Loopback Playback Volume"
+ };
+ int i, err;
+
+ for (i = 0; i < 3; ++i) {
+ memset(&knew, 0, sizeof(knew));
+ knew.name = names[i];
+ knew.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
+ knew.count = 1;
+ knew.access = SNDRV_CTL_ELEM_ACCESS_READWRITE |
+ SNDRV_CTL_ELEM_ACCESS_TLV_READ;
+ knew.private_value = 2 * i;
+ knew.info = pt2258_stereo_volume_info;
+ knew.get = pt2258_stereo_volume_get;
+ knew.put = pt2258_stereo_volume_put;
+ knew.tlv.p = pt2258_db_scale;
+
+ err = snd_ctl_add(pt->card, snd_ctl_new1(&knew, pt));
+ if (err < 0)
+ return err;
+ }
+
+ memset(&knew, 0, sizeof(knew));
+ knew.name = "Loopback Switch";
+ knew.iface = SNDRV_CTL_ELEM_IFACE_MIXER;
+ knew.info = pt2258_switch_info;
+ knew.get = pt2258_switch_get;
+ knew.put = pt2258_switch_put;
+ knew.access = 0;
+ err = snd_ctl_add(pt->card, snd_ctl_new1(&knew, pt));
+ if (err < 0)
+ return err;
+
+ return 0;
+}
+
+EXPORT_SYMBOL(snd_pt2258_reset);
+EXPORT_SYMBOL(snd_pt2258_build_controls);
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.