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>

5 files changed, 573 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 00000000000..b80391a8a9f
--- /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;
+}
diff --git a/drivers/media/video/cx18/cx18-alsa-mixer.h b/drivers/media/video/cx18/cx18-alsa-mixer.h
new file mode 100644
index 00000000000..2d418db000f
--- /dev/null
+++ b/drivers/media/video/cx18/cx18-alsa-mixer.h
@@ -0,0 +1,23 @@
+/*
+ *  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
+ */
+
+int __init snd_cx18_mixer_create(struct snd_cx18_card *cxsc);
diff --git a/drivers/media/video/cx18/cx18-alsa.c b/drivers/media/video/cx18/cx18-alsa.c
new file mode 100644
index 00000000000..dde2b0482f3
--- /dev/null
+++ b/drivers/media/video/cx18/cx18-alsa.c
@@ -0,0 +1,303 @@
+/*
+ *  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/module.h>
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/spinlock.h>
+
+#include <media/v4l2-device.h>
+
+#include <sound/core.h>
+#include <sound/initval.h>
+
+#include "cx18-driver.h"
+#include "cx18-alsa-mixer.h"
+#include "cx18-alsa-pcm.h"
+
+int cx18_alsa_debug;
+
+module_param_named(debug, cx18_alsa_debug, int, 0644);
+MODULE_PARM_DESC(debug,
+                 "Debug level (bitmask). Default: 0\n"
+                 "\t\t\t  1/0x0001: warning\n"
+                 "\t\t\t  2/0x0002: info\n");
+
+MODULE_AUTHOR("Andy Walls");
+MODULE_DESCRIPTION("CX23418 ALSA Interface");
+MODULE_SUPPORTED_DEVICE("CX23418 MPEG2 encoder");
+MODULE_LICENSE("GPL");
+
+MODULE_VERSION(CX18_VERSION);
+
+static inline
+struct snd_cx18_card *to_snd_cx18_card(struct v4l2_device *v4l2_dev)
+{
+        return to_cx18(v4l2_dev)->alsa;
+}
+
+static inline
+struct snd_cx18_card *p_to_snd_cx18_card(struct v4l2_device **v4l2_dev)
+{
+        return container_of(v4l2_dev, struct snd_cx18_card, v4l2_dev);
+}
+
+static void snd_cx18_card_free(struct snd_cx18_card *cxsc)
+{
+        if (cxsc == NULL)
+                return;
+
+        if (cxsc->v4l2_dev != NULL)
+                to_cx18(cxsc->v4l2_dev)->alsa = NULL;
+
+        /* FIXME - take any other stopping actions needed */
+
+        kfree(cxsc);
+}
+
+static void snd_cx18_card_private_free(struct snd_card *sc)
+{
+        if (sc == NULL)
+                return;
+        snd_cx18_card_free(sc->private_data);
+        sc->private_data = NULL;
+        sc->private_free = NULL;
+}
+
+static int __init snd_cx18_card_create(struct v4l2_device *v4l2_dev,
+                                       struct snd_card *sc,
+                                       struct snd_cx18_card **cxsc)
+{
+        *cxsc = kzalloc(sizeof(struct snd_cx18_card), GFP_KERNEL);
+        if (*cxsc == NULL)
+                return -ENOMEM;
+
+        (*cxsc)->v4l2_dev = v4l2_dev;
+        (*cxsc)->sc = sc;
+
+        sc->private_data = *cxsc;
+        sc->private_free = snd_cx18_card_private_free;
+
+        return 0;
+}
+
+static int __init snd_cx18_card_set_names(struct snd_cx18_card *cxsc)
+{
+        struct cx18 *cx = to_cx18(cxsc->v4l2_dev);
+        struct snd_card *sc = cxsc->sc;
+
+        /* sc->driver is used by alsa-lib's configurator: simple, unique */
+        strlcpy(sc->driver, "CX23418", sizeof(sc->driver));
+
+        /* sc->shortname is a symlink in /proc/asound: CX18-M -> cardN */
+        snprintf(sc->shortname,  sizeof(sc->shortname), "CX18-%d",
+                 cx->instance);
+
+        /* sc->longname is read from /proc/asound/cards */
+        snprintf(sc->longname, sizeof(sc->longname),
+                 "CX23418 #%d %s TV/FM Radio/Line-In Capture",
+                 cx->instance, cx->card_name);
+}
+
+static int __init snd_cx18_init(struct v4l2_device *v4l2_dev)
+{
+        struct cx18 *cx = to_cx18(v4l2_dev);
+        struct snd_card *sc;
+        struct snd_cx18_card *cxsc;
+        int ret;
+
+        /* Numbrs steps from "Writing an ALSA Driver" by Takashi Iwai */
+
+        /* (1) Check and increment the device index */
+        /* This is a no-op for us.  We'll use the cx->instance */
+
+        /* (2) Create a card instance */
+        ret = snd_card_create(SNDRV_DEFAULT_IDX1, /* use first available id */
+                              SNDRV_DEFAULT_STR1, /* xid from end of shortname*/
+                              THIS_MODULE, 0, &sc);
+        if (ret) {
+                CX18_ALSA_ERR("%s: snd_card_create() failed with err %d\n",
+                              __func__, ret);
+                goto err_exit;
+        }
+
+        /* (3) Create a main component */
+        ret = snd_cx18_card_create(v4l2_dev, sc, &cxsc);
+        if (ret) {
+                CX18_ALSA_ERR("%s: snd_cx18_card_create() failed with err %d\n",
+                              __func__, ret);
+                goto err_exit_free;
+        }
+
+        /* (4) Set the driver ID and name strings */
+        snd_cx18_card_set_names(cxsc);
+
+        /* (5) Create other components: mixer, PCM, & proc files */
+        ret = snd_cx18_mixer_create(cxsc);
+        if (ret) {
+                CX18_ALSA_WARN("%s: snd_cx18_mixer_create() failed with err %d:"
+                               "proceeding anyway\n", __func__, ret);
+        }
+
+        ret = snd_cx18_pcm_create(cxsc);
+        if (ret) {
+                CX18_ALSA_ERR("%s: snd_cx18_pcm_create() failed with err %d\n",
+                              __func__, ret);
+                goto err_exit_free;
+        }
+        /* FIXME - proc files */
+
+        /* (7) Set the driver data and return 0 */
+        /* We do this out of normal order for PCI drivers to avoid races */
+        cx->alsa = cxsc;
+
+        /* (6) Register the card instance */
+        ret = snd_card_register(sc);
+        if (ret) {
+                cx->alsa = NULL;
+                CX18_ALSA_ERR("%s: snd_card_register() failed with err %d\n",
+                              __func__, ret);
+                goto err_exit_free;
+        }
+
+        return 0;
+
+err_exit_free:
+        snd_card_free(sc);
+err_exit:
+        return ret;
+}
+
+static int __init cx18_alsa_init_callback(struct device *dev, void *data)
+{
+        struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);
+        int *count = data;
+        struct cx18 *cx;
+        struct cx18_stream *s;
+
+        if (v4l2_dev == NULL) {
+                printk(KERN_ERR "cx18-alsa: %s: struct v4l2_device * is NULL\n",
+                       __func__);
+                return 0;
+        }
+
+        cx = to_cx18(v4l2_dev);
+        s = &cx->streams[CX18_ENC_STREAM_TYPE_PCM];
+        if (s->video_dev == NULL) {
+                CX18_DEBUG_ALSA_INFO("%s: PCM stream for card is disabled - "
+                                     "skipping\n", __func__);
+                return 0;
+        }
+
+        if (cx->alsa != NULL) {
+                CX18_ALSA_ERR("%s: struct snd_cx18_card * already exists\n",
+                              __func__);
+                return 0;
+        }
+
+        if (snd_cx18_init(v4l2_dev)) {
+                CX18_ALSA_ERR("%s: failed to create struct snd_cx18_card\n",
+                              __func__);
+        } else {
+                CX18_DEBUG_ALSA_INFO("%s: created cx18 ALSA interface instance "
+                                     "%d\n", __func__, *count);
+                (*count)++;
+        }
+        return 0;
+}
+
+static int __init cx18_alsa_init(void)
+{
+        struct device_driver *drv;
+        int count = 0;
+        int ret;
+
+        printk(KERN_INFO "cx18-alsa: module loading...\n");
+
+        drv = driver_find("cx18", &pci_bus_type);
+        ret = driver_for_each_device(drv, NULL, &count,
+                                     cx18_alsa_init_callback);
+        put_driver(drv);
+
+        if (count == 0) {
+                printk(KERN_ERR "cx18-alsa: no cx18 cards found with a PCM "
+                       "capture stream allocated\n");
+                ret = -ENODEV;
+        } else {
+                printk(KERN_INFO "cx18-alsa: ALSA interface(s) created for %d "
+                       "cx18 card(s)\n", count);
+                ret = 0;
+        }
+
+        printk(KERN_INFO "cx18-alsa: module load complete\n");
+        return ret;
+}
+
+static void snd_cx18_exit(struct snd_cx18_card *cxsc)
+{
+        struct cx18 *cx = to_cx18(cxsc->4l2_dev);
+
+        /* FIXME - pointer checks & shutdown cxsc */
+
+        snd_card_free(cxsc->sc);
+        cx->alsa = NULL;
+}
+
+static int cx18_alsa_exit_callback(struct device *dev, void *data)
+{
+        struct v4l2_device *v4l2_dev = dev_get_drvdata(dev);
+        struct snd_cx18_card *cxsc;
+        struct cx18 *cx;
+
+        if (v4l2_dev == NULL) {
+                printk(KERN_ERR "cx18-alsa: %s: struct v4l2_device * is NULL\n",
+                       __func__);
+                return 0;
+        }
+
+        cxsc = to_snd_cx18_card(v4l2_dev);
+        if (cxsc == NULL) {
+                CX18_ALSA_WARN("%s: struct snd_cx18_card * is NULL\n",
+                               __func__);
+                return 0;
+        }
+
+        snd_cx18_exit(cxsc);
+        return 0;
+}
+
+static void cx18_alsa_exit(void)
+{
+        struct device_driver *drv;
+        int ret;
+
+        printk(KERN_INFO "cx18-alsa: module unloading...\n");
+
+        drv = driver_find("cx18", &pci_bus_type);
+        ret = driver_for_each_device(drv, NULL, NULL, cx18_alsa_exit_callback);
+        put_driver(drv);
+
+        printk(KERN_INFO "cx18-alsa: module unload complete\n");
+}
+
+module_init(cx18_alsa_init);
+module_exit(cx18_alsa_exit);
diff --git a/drivers/media/video/cx18/cx18-alsa.h b/drivers/media/video/cx18/cx18-alsa.h
new file mode 100644
index 00000000000..ea8576fd578
--- /dev/null
+++ b/drivers/media/video/cx18/cx18-alsa.h
@@ -0,0 +1,55 @@
+/*
+ *  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
+ */
+
+struct snd_card;
+
+struct snd_cx18_card {
+        struct v4l2_device *v4l2_dev;
+        struct snd_card *sc;
+};
+
+extern int cx18_alsa_debug;
+
+#define CX18_ALSA_DBGFLG_WARN  (1 << 0)
+#define CX18_ALSA_DBGFLG_WARN  (1 << 0)
+#define CX18_ALSA_DBGFLG_INFO  (1 << 1)
+
+#define CX18_ALSA_DEBUG(x, type, fmt, args...) \
+        do { \
+                if ((x) & cx18_alsa_debug) \
+                        printk(KERN_INFO "%s-alsa: " type ": " fmt, \
+                                v4l2_dev->name , ## args); \
+        } while (0)
+
+#define CX18_ALSA_DEBUG_WARN(fmt, args...) \
+        CX18_ALSA_DEBUG(CX18_ALSA_DBGFLG_WARN, "warning", fmt , ## args)
+
+#define CX18_ALSA_DEBUG_INFO(fmt, args...) \
+        CX18_ALSA_DEBUG(CX18_ALSA_DBGFLG_INFO, "info", fmt , ## args)
+
+#define CX18_ALSA_ERR(fmt, args...) \
+        printk(KERN_ERR "%s-alsa: " fmt, v4l2_dev->name , ## args)
+
+#define CX18_ALSA_WARN(fmt, args...) \
+        printk(KERN_WARNING "%s-alsa: " fmt, v4l2_dev->name , ## args)
+
+#define CX18_ALSA_INFO(fmt, args...) \
+        printk(KERN_INFO "%s-alsa: " fmt, v4l2_dev->name , ## args)
diff --git a/drivers/media/video/cx18/cx18-driver.h b/drivers/media/video/cx18/cx18-driver.h
index fecebf3fb55..fcb99531dab 100644
--- a/drivers/media/video/cx18/cx18-driver.h
+++ b/drivers/media/video/cx18/cx18-driver.h
@@ -574,6 +574,7 @@ struct cx18 {
         int stream_buffers[CX18_MAX_STREAMS]; /* # of buffers for each stream */
         int stream_buf_size[CX18_MAX_STREAMS]; /* Stream buffer size */
         struct cx18_stream streams[CX18_MAX_STREAMS];   /* Stream data */
+        struct snd_cx18_card *alsa; /* ALSA interface for PCM capture stream */
         unsigned long i_flags;  /* global cx18 flags */
         atomic_t ana_capturing; /* count number of active analog capture streams */
         atomic_t tot_capturing; /* total count number of active capture streams */