[net-next-2.6.git] / drivers / media / video / cx18 / cx18-alsa-mixer.c

/*
 *  ALSA mixer controls for the
 *  ALSA interface to cx18 PCM capture streams
 *
 *  Copyright (C) 2009  Andy Walls <awalls@md.metrocast.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"

/*
 * 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_lock(cxsc);
	ret = v4l2_subdev_call(cx->sd_av, core, g_ctrl, &vctrl);
	snd_cx18_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_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_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;
}
Commit	Line	Data
9722c8f9 AW	1	/*
	2	* ALSA mixer controls for the
	3	* ALSA interface to cx18 PCM capture streams
	4	*
6afdeaf8	5	* Copyright (C) 2009 Andy Walls <awalls@md.metrocast.net>
9722c8f9 AW	6	*
	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License as published by
	9	* the Free Software Foundation; either version 2 of the License, or
	10	* (at your option) any later version.
	11	*
	12	* This program is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	* GNU General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU General Public License
	18	* along with this program; if not, write to the Free Software
	19	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
	20	* 02111-1307 USA
	21	*/
	22
	23	#include <linux/init.h>
	24	#include <linux/kernel.h>
	25	#include <linux/device.h>
	26	#include <linux/spinlock.h>
	27	#include <linux/videodev2.h>
	28
	29	#include <media/v4l2-device.h>
	30
	31	#include <sound/core.h>
	32	#include <sound/control.h>
	33	#include <sound/tlv.h>
	34
	35	#include "cx18-alsa.h"
	36	#include "cx18-driver.h"
	37
9722c8f9 AW	38	/*
	39	* Note the cx18-av-core volume scale is funny, due to the alignment of the
	40	* scale with another chip's range:
	41	*
	42	* v4l2_control value /512 indicated dB actual dB reg 0x8d4
	43	* 0x0000 - 0x01ff 0 -119 -96 228
	44	* 0x0200 - 0x02ff 1 -118 -96 228
	45	* ...
	46	* 0x2c00 - 0x2dff 22 -97 -96 228
	47	* 0x2e00 - 0x2fff 23 -96 -96 228
	48	* 0x3000 - 0x31ff 24 -95 -95 226
	49	* ...
	50	* 0xee00 - 0xefff 119 0 0 36
	51	* ...
	52	* 0xfe00 - 0xffff 127 +8 +8 20
	53	*/
	54	static inline int dB_to_cx18_av_vol(int dB)
	55	{
	56	if (dB < -96)
	57	dB = -96;
	58	else if (dB > 8)
	59	dB = 8;
	60	return (dB + 119) << 9;
	61	}
	62
	63	static inline int cx18_av_vol_to_dB(int v)
	64	{
	65	if (v < (23 << 9))
	66	v = (23 << 9);
	67	else if (v > (127 << 9))
	68	v = (127 << 9);
	69	return (v >> 9) - 119;
	70	}
	71
	72	static int snd_cx18_mixer_tv_vol_info(struct snd_kcontrol *kcontrol,
	73	struct snd_ctl_elem_info *uinfo)
	74	{
	75	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
	76	uinfo->count = 1;
	77	/* We're already translating values, just keep this control in dB */
	78	uinfo->value.integer.min = -96;
4dae2f0f	79	uinfo->value.integer.max = 8;
9722c8f9 AW	80	uinfo->value.integer.step = 1;
	81	return 0;
	82	}
	83
	84	static int snd_cx18_mixer_tv_vol_get(struct snd_kcontrol *kctl,
	85	struct snd_ctl_elem_value *uctl)
	86	{
	87	struct snd_cx18_card *cxsc = snd_kcontrol_chip(kctl);
	88	struct cx18 *cx = to_cx18(cxsc->v4l2_dev);
	89	struct v4l2_control vctrl;
	90	int ret;
	91
	92	vctrl.id = V4L2_CID_AUDIO_VOLUME;
	93	vctrl.value = dB_to_cx18_av_vol(uctl->value.integer.value[0]);
	94
83695009	95	snd_cx18_lock(cxsc);
9722c8f9	96	ret = v4l2_subdev_call(cx->sd_av, core, g_ctrl, &vctrl);
83695009	97	snd_cx18_unlock(cxsc);
9722c8f9 AW	98
	99	if (!ret)
	100	uctl->value.integer.value[0] = cx18_av_vol_to_dB(vctrl.value);
	101	return ret;
	102	}
	103
	104	static int snd_cx18_mixer_tv_vol_put(struct snd_kcontrol *kctl,
	105	struct snd_ctl_elem_value *uctl)
	106	{
	107	struct snd_cx18_card *cxsc = snd_kcontrol_chip(kctl);
	108	struct cx18 *cx = to_cx18(cxsc->v4l2_dev);
	109	struct v4l2_control vctrl;
	110	int ret;
	111
	112	vctrl.id = V4L2_CID_AUDIO_VOLUME;
	113	vctrl.value = dB_to_cx18_av_vol(uctl->value.integer.value[0]);
	114
83695009	115	snd_cx18_lock(cxsc);
9722c8f9 AW	116
	117	/* Fetch current state */
	118	ret = v4l2_subdev_call(cx->sd_av, core, g_ctrl, &vctrl);
	119
	120	if (ret \|\|
	121	(cx18_av_vol_to_dB(vctrl.value) != uctl->value.integer.value[0])) {
	122
	123	/* Set, if needed */
	124	vctrl.value = dB_to_cx18_av_vol(uctl->value.integer.value[0]);
	125	ret = v4l2_subdev_call(cx->sd_av, core, s_ctrl, &vctrl);
	126	if (!ret)
	127	ret = 1; /* Indicate control was changed w/o error */
	128	}
83695009	129	snd_cx18_unlock(cxsc);
9722c8f9 AW	130
	131	return ret;
	132	}
	133
	134
	135	/* This is a bit of overkill, the slider is already in dB internally */
	136	static DECLARE_TLV_DB_SCALE(snd_cx18_mixer_tv_vol_db_scale, -9600, 100, 0);
	137
	138	static struct snd_kcontrol_new snd_cx18_mixer_tv_vol __initdata = {
	139	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
	140	.name = "Analog TV Capture Volume",
	141	.access = SNDRV_CTL_ELEM_ACCESS_READWRITE \|
	142	SNDRV_CTL_ELEM_ACCESS_TLV_READ,
	143	.info = snd_cx18_mixer_tv_volume_info,
	144	.get = snd_cx18_mixer_tv_volume_get,
	145	.put = snd_cx18_mixer_tv_volume_put,
	146	.tlv.p = snd_cx18_mixer_tv_vol_db_scale
	147	};
	148
	149	/* FIXME - add mute switch and balance, bass, treble sliders:
	150	V4L2_CID_AUDIO_MUTE
	151
	152	V4L2_CID_AUDIO_BALANCE
	153
	154	V4L2_CID_AUDIO_BASS
	155	V4L2_CID_AUDIO_TREBLE
	156	*/
	157
	158	/* FIXME - add stereo, lang1, lang2, mono menu */
	159	/* FIXME - add CS5345 I2S volume for HVR-1600 */
	160
	161	int __init snd_cx18_mixer_create(struct snd_cx18_card *cxsc)
	162	{
	163	struct v4l2_device *v4l2_dev = cxsc->v4l2_dev;
	164	struct snd_card *sc = cxsc->sc;
	165	int ret;
	166
	167	strlcpy(sc->mixername, "CX23418 Mixer", sizeof(sc->mixername));
	168
	169	ret = snd_ctl_add(sc, snd_ctl_new1(snd_cx18_mixer_tv_vol, cxsc));
	170	if (ret) {
	171	CX18_ALSA_WARN("%s: failed to add %s control, err %d\n",
	172	__func__, snd_cx18_mixer_tv_vol.name, ret);
	173	}
	174	return ret;
	175	}