V4L/DVB: cx18-alsa: Initial non-working cx18-alsa files

Initial cx18-alsa module files check-in to avoid losing work.

Signed-off-by: Andy Walls <awalls@radix.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 191 insertions, 0 deletions

diff --git a/drivers/media/video/cx18/cx18-alsa-mixer.c b/drivers/media/video/cx18/cx18-alsa-mixer.c
new file mode 100644
index 000000000000..b80391a8a9fc
--- /dev/null
+++ b/drivers/media/video/cx18/cx18-alsa-mixer.c
@@ -0,0 +1,191 @@
+/*
+ *  ALSA mixer controls for the
+ *  ALSA interface to cx18 PCM capture streams
+ *
+ *  Copyright (C) 2009  Andy Walls <awalls@radix.net>
+ *
+ *  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 <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/spinlock.h>
+#include <linux/videodev2.h>
+
+#include <media/v4l2-device.h>
+
+#include <sound/core.h>
+#include <sound/control.h>
+#include <sound/tlv.h>
+
+#include "cx18-alsa.h"
+#include "cx18-driver.h"
+
+/*
+ * Mixer manipulations are like v4l2 ioctl() calls to manipulate controls,
+ * just use the same lock we use for ioctl()s for now
+ */
+static inline void snd_cx18_mixer_lock(struct snd_cx18_card *cxsc)
+{
+        struct cx18 *cx = to_cx18(cxsc->v4l2_dev);
+        mutex_lock(&cx->serialize_lock);
+}
+
+static inline void snd_cx18_mixer_unlock(struct snd_cx18_card *cxsc)
+{
+        struct cx18 *cx = to_cx18(cxsc->v4l2_dev);
+        mutex_unlock(&cx->serialize_lock);
+}
+
+/*
+ * Note the cx18-av-core volume scale is funny, due to the alignment of the
+ * scale with another chip's range:
+ *
+ * v4l2_control value   /512    indicated dB    actual dB       reg 0x8d4
+ * 0x0000 - 0x01ff        0     -119            -96             228
+ * 0x0200 - 0x02ff        1     -118            -96             228
+ * ...
+ * 0x2c00 - 0x2dff       22      -97            -96             228
+ * 0x2e00 - 0x2fff       23      -96            -96             228
+ * 0x3000 - 0x31ff       24      -95            -95             226
+ * ...
+ * 0xee00 - 0xefff      119        0              0              36
+ * ...
+ * 0xfe00 - 0xffff      127       +8             +8              20
+ */
+static inline int dB_to_cx18_av_vol(int dB)
+{
+        if (dB < -96)
+                dB = -96;
+        else if (dB > 8)
+                dB = 8;
+        return (dB + 119) << 9;
+}
+
+static inline int cx18_av_vol_to_dB(int v)
+{
+        if (v < (23 << 9))
+                v = (23 << 9);
+        else if (v > (127 << 9))
+                v = (127 << 9);
+        return (v >> 9) - 119;
+}
+
+static int snd_cx18_mixer_tv_vol_info(struct snd_kcontrol *kcontrol,
+                                      struct snd_ctl_elem_info *uinfo)
+{
+        uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
+        uinfo->count = 1;
+        /* We're already translating values, just keep this control in dB */
+        uinfo->value.integer.min  = -96;
+        uinfo->value.integer.max  =  +8;
+        uinfo->value.integer.step =   1;
+        return 0;
+}
+
+static int snd_cx18_mixer_tv_vol_get(struct snd_kcontrol *kctl,
+                                     struct snd_ctl_elem_value *uctl)
+{
+        struct snd_cx18_card *cxsc = snd_kcontrol_chip(kctl);
+        struct cx18 *cx = to_cx18(cxsc->v4l2_dev);
+        struct v4l2_control vctrl;
+        int ret;
+
+        vctrl.id = V4L2_CID_AUDIO_VOLUME;
+        vctrl.value = dB_to_cx18_av_vol(uctl->value.integer.value[0]);
+
+        snd_cx18_mixer_lock(cxsc);
+        ret = v4l2_subdev_call(cx->sd_av, core, g_ctrl, &vctrl);
+        snd_cx18_mixer_unlock(cxsc);
+
+        if (!ret)
+                uctl->value.integer.value[0] = cx18_av_vol_to_dB(vctrl.value);
+        return ret;
+}
+
+static int snd_cx18_mixer_tv_vol_put(struct snd_kcontrol *kctl,
+                                     struct snd_ctl_elem_value *uctl)
+{
+        struct snd_cx18_card *cxsc = snd_kcontrol_chip(kctl);
+        struct cx18 *cx = to_cx18(cxsc->v4l2_dev);
+        struct v4l2_control vctrl;
+        int ret;
+
+        vctrl.id = V4L2_CID_AUDIO_VOLUME;
+        vctrl.value = dB_to_cx18_av_vol(uctl->value.integer.value[0]);
+
+        snd_cx18_mixer_lock(cxsc);
+
+        /* Fetch current state */
+        ret = v4l2_subdev_call(cx->sd_av, core, g_ctrl, &vctrl);
+
+        if (ret ||
+            (cx18_av_vol_to_dB(vctrl.value) != uctl->value.integer.value[0])) {
+
+                /* Set, if needed */
+                vctrl.value = dB_to_cx18_av_vol(uctl->value.integer.value[0]);
+                ret = v4l2_subdev_call(cx->sd_av, core, s_ctrl, &vctrl);
+                if (!ret)
+                        ret = 1; /* Indicate control was changed w/o error */
+        }
+        snd_cx18_mixer_unlock(cxsc);
+
+        return ret;
+}
+
+
+/* This is a bit of overkill, the slider is already in dB internally */
+static DECLARE_TLV_DB_SCALE(snd_cx18_mixer_tv_vol_db_scale, -9600, 100, 0);
+
+static struct snd_kcontrol_new snd_cx18_mixer_tv_vol __initdata = {
+        .iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+        .name = "Analog TV Capture Volume",
+        .access = SNDRV_CTL_ELEM_ACCESS_READWRITE |
+                  SNDRV_CTL_ELEM_ACCESS_TLV_READ,
+        .info = snd_cx18_mixer_tv_volume_info,
+        .get = snd_cx18_mixer_tv_volume_get,
+        .put = snd_cx18_mixer_tv_volume_put,
+        .tlv.p = snd_cx18_mixer_tv_vol_db_scale
+};
+
+/* FIXME - add mute switch and balance, bass, treble sliders:
+        V4L2_CID_AUDIO_MUTE
+
+        V4L2_CID_AUDIO_BALANCE
+
+        V4L2_CID_AUDIO_BASS
+        V4L2_CID_AUDIO_TREBLE
+*/
+
+/* FIXME - add stereo, lang1, lang2, mono menu */
+/* FIXME - add CS5345 I2S volume for HVR-1600 */
+
+int __init snd_cx18_mixer_create(struct snd_cx18_card *cxsc)
+{
+        struct v4l2_device *v4l2_dev = cxsc->v4l2_dev;
+        struct snd_card *sc = cxsc->sc;
+        int ret;
+
+        strlcpy(sc->mixername, "CX23418 Mixer", sizeof(sc->mixername));
+
+        ret = snd_ctl_add(sc, snd_ctl_new1(snd_cx18_mixer_tv_vol, cxsc));
+        if (ret) {
+                CX18_ALSA_WARN("%s: failed to add %s control, err %d\n",
+                                __func__, snd_cx18_mixer_tv_vol.name, ret);
+        }
+        return ret;
+}