path: root/drivers/media/video/cx88/cx88-tvaudio.c

/*

    cx88x-audio.c - Conexant CX23880/23881 audio downstream driver driver

     (c) 2001 Michael Eskin, Tom Zakrajsek [Windows version]
     (c) 2002 Yurij Sysoev <yurij@naturesoft.net>
     (c) 2003 Gerd Knorr <kraxel@bytesex.org>

    -----------------------------------------------------------------------

    Lot of voodoo here.  Even the data sheet doesn't help to
    understand what is going on here, the documentation for the audio
    part of the cx2388x chip is *very* bad.

    Some of this comes from party done linux driver sources I got from
    [undocumented].

    Some comes from the dscaler sources, one of the dscaler driver guy works
    for Conexant ...

    -----------------------------------------------------------------------

    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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include <linux/module.h>
#include <linux/errno.h>
#include <linux/freezer.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/poll.h>
#include <linux/signal.h>
#include <linux/ioport.h>
#include <linux/types.h>
#include <linux/interrupt.h>
#include <linux/vmalloc.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/kthread.h>

#include "cx88.h"

static unsigned int audio_debug;
module_param(audio_debug, int, 0644);
MODULE_PARM_DESC(audio_debug, "enable debug messages [audio]");

static unsigned int always_analog;
module_param(always_analog,int,0644);
MODULE_PARM_DESC(always_analog,"force analog audio out");

static unsigned int radio_deemphasis;
module_param(radio_deemphasis,int,0644);
MODULE_PARM_DESC(radio_deemphasis, "Radio deemphasis time constant, "
		 "0=None, 1=50us (elsewhere), 2=75us (USA)");

#define dprintk(fmt, arg...)	if (audio_debug) \
	printk(KERN_DEBUG "%s/0: " fmt, core->name , ## arg)

/* ----------------------------------------------------------- */

static char *aud_ctl_names[64] = {
	[EN_BTSC_FORCE_MONO] = "BTSC_FORCE_MONO",
	[EN_BTSC_FORCE_STEREO] = "BTSC_FORCE_STEREO",
	[EN_BTSC_FORCE_SAP] = "BTSC_FORCE_SAP",
	[EN_BTSC_AUTO_STEREO] = "BTSC_AUTO_STEREO",
	[EN_BTSC_AUTO_SAP] = "BTSC_AUTO_SAP",
	[EN_A2_FORCE_MONO1] = "A2_FORCE_MONO1",
	[EN_A2_FORCE_MONO2] = "A2_FORCE_MONO2",
	[EN_A2_FORCE_STEREO] = "A2_FORCE_STEREO",
	[EN_A2_AUTO_MONO2] = "A2_AUTO_MONO2",
	[EN_A2_AUTO_STEREO] = "A2_AUTO_STEREO",
	[EN_EIAJ_FORCE_MONO1] = "EIAJ_FORCE_MONO1",
	[EN_EIAJ_FORCE_MONO2] = "EIAJ_FORCE_MONO2",
	[EN_EIAJ_FORCE_STEREO] = "EIAJ_FORCE_STEREO",
	[EN_EIAJ_AUTO_MONO2] = "EIAJ_AUTO_MONO2",
	[EN_EIAJ_AUTO_STEREO] = "EIAJ_AUTO_STEREO",
	[EN_NICAM_FORCE_MONO1] = "NICAM_FORCE_MONO1",
	[EN_NICAM_FORCE_MONO2] = "NICAM_FORCE_MONO2",
	[EN_NICAM_FORCE_STEREO] = "NICAM_FORCE_STEREO",
	[EN_NICAM_AUTO_MONO2] = "NICAM_AUTO_MONO2",
	[EN_NICAM_AUTO_STEREO] = "NICAM_AUTO_STEREO",
	[EN_FMRADIO_FORCE_MONO] = "FMRADIO_FORCE_MONO",
	[EN_FMRADIO_FORCE_STEREO] = "FMRADIO_FORCE_STEREO",
	[EN_FMRADIO_AUTO_STEREO] = "FMRADIO_AUTO_STEREO",
};

struct rlist {
	u32 reg;
	u32 val;
};

static void set_audio_registers(struct cx88_core *core, const struct rlist *l)
{
	int i;

	for (i = 0; l[i].reg; i++) {
		switch (l[i].reg) {
		case AUD_PDF_DDS_CNST_BYTE2:
		case AUD_PDF_DDS_CNST_BYTE1:
		case AUD_PDF_DDS_CNST_BYTE0:
		case AUD_QAM_MODE:
		case AUD_PHACC_FREQ_8MSB:
		case AUD_PHACC_FREQ_8LSB:
			cx_writeb(l[i].reg, l[i].val);
			break;
		default:
			cx_write(l[i].reg, l[i].val);
			break;
		}
	}
}

static void set_audio_start(struct cx88_core *core, u32 mode)
{
	/* mute */
	cx_write(AUD_VOL_CTL, (1 << 6));

	/* start programming */
	cx_write(AUD_INIT, mode);
	cx_write(AUD_INIT_LD, 0x0001);
	cx_write(AUD_SOFT_RESET, 0x0001);
}

static void set_audio_finish(struct cx88_core *core, u32 ctl)
{
	u32 volume;

	/* restart dma; This avoids buzz in NICAM and is good in others  */
	cx88_stop_audio_dma(core);
	cx_write(AUD_RATE_THRES_DMD, 0x000000C0);
	cx88_start_audio_dma(core);

	if (core->board.mpeg & CX88_MPEG_BLACKBIRD) {
		cx_write(AUD_I2SINPUTCNTL, 4);
		cx_write(AUD_BAUDRATE, 1);
		/* 'pass-thru mode': this enables the i2s output to the mpeg encoder */
		cx_set(AUD_CTL, EN_I2SOUT_ENABLE);
		cx_write(AUD_I2SOUTPUTCNTL, 1);
		cx_write(AUD_I2SCNTL, 0);
		/* cx_write(AUD_APB_IN_RATE_ADJ, 0); */
	}
	if ((always_analog) || (!(core->board.mpeg