path: root/sound/drivers/mts64.c

/*     
 *   ALSA Driver for Ego Systems Inc. (ESI) Miditerminal 4140
 *   Copyright (c) 2006 by Matthias König <mk@phasorlab.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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */

#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/parport.h>
#include <linux/spinlock.h>
#include <linux/delay.h>
#include <sound/core.h>
#include <sound/initval.h>
#include <sound/rawmidi.h>
#include <sound/control.h>

#define CARD_NAME "Miditerminal 4140"
#define DRIVER_NAME "MTS64"
#define PLATFORM_DRIVER "snd_mts64"

static int index[SNDRV_CARDS]  = SNDRV_DEFAULT_IDX;
static char *id[SNDRV_CARDS]   = SNDRV_DEFAULT_STR;
static int enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;

static struct platform_device *platform_devices[SNDRV_CARDS]; 
static int device_count;

module_param_array(index, int, NULL, S_IRUGO);
MODULE_PARM_DESC(index, "Index value for " CARD_NAME " soundcard.");
module_param_array(id, charp, NULL, S_IRUGO);
MODULE_PARM_DESC(id, "ID string for " CARD_NAME " soundcard.");
module_param_array(enable, bool, NULL, S_IRUGO);
MODULE_PARM_DESC(enable, "Enable " CARD_NAME " soundcard.");

MODULE_AUTHOR("Matthias Koenig <mk@phasorlab.de>");
MODULE_DESCRIPTION("ESI Miditerminal 4140");
MODULE_LICENSE("GPL");
MODULE_SUPPORTED_DEVICE("{{ESI,Miditerminal 4140}}");

/*********************************************************************
 * Chip specific
 *********************************************************************/
#define MTS64_NUM_INPUT_PORTS 5
#define MTS64_NUM_OUTPUT_PORTS 4
#define MTS64_SMPTE_SUBSTREAM 4

struct mts64 {
	spinlock_t lock;
	struct snd_card *card;
	struct snd_rawmidi *rmidi;
	struct pardevice *pardev;
	int pardev_claimed;

	int open_count;
	int current_midi_output_port;
	int current_midi_input_port;
	u8 mode[MTS64_NUM_INPUT_PORTS];
	struct snd_rawmidi_substream *midi_input_substream[MTS64_NUM_INPUT_PORTS];
	int smpte_switch;
	u8 time[4]; /* [0]=hh, [1]=mm, [2]=ss, [3]=ff */
	u8 fps;
};

static int snd_mts64_free(struct mts64 *mts)
{
	kfree(mts);
	return 0;
}

static int __devinit snd_mts64_create(struct snd_card *card, 
				      struct pardevice *pardev, 
				      struct mts64 **rchip)
{
	struct mts64 *mts;

	*rchip = NULL;

	mts = kzalloc(sizeof(struct mts64), GFP_KERNEL);
	if (mts == NULL) 
		return -ENOMEM;

	/* Init chip specific data */
	spin_lock_init(&mts->lock);
	mts->card = card;
	mts->pardev = pardev;
	mts->current_midi_output_port = -1;
	mts->current_midi_input_port = -1;

	*rchip = mts;

	return 0;
}

/*********************************************************************
 * HW register related constants
 *********************************************************************/

/* Status Bits */
#define MTS64_STAT_BSY             0x80
#define MTS64_STAT_BIT_SET         0x20  /* readout process, bit is set */
#define MTS64_STAT_PORT            0x10  /* read byte is a port number */

/* Control Bits */
#define MTS64_CTL_READOUT          0x08  /* enable readout */
#define MTS64_CTL_WRITE_CMD        0x06  
#define MTS64_CTL_WRITE_DATA       0x02  
#define MTS64_CTL_STROBE           0x01  

/* Command */
#define MTS64_CMD_RESET            0xfe
#define MTS64_CMD_PROBE            0x8f  /* Used in probing procedure */
#define MTS64_CMD_SMPTE_SET_TIME   0xe8
#define MTS64_CMD_SMPTE_SET_FPS    0xee
#define MTS64_CMD_SMPTE_STOP       0xef
#define MTS64_CMD_SMPTE_FPS_24     0xe3
#define MTS64_CMD_SMPTE_FPS_25     0xe2
#define MTS64_CMD_SMPTE_FPS_2997   0xe4 
#define MTS64_CMD_SMPTE_FPS_30D    0xe1
#define MTS64_CMD_SMPTE_FPS_30     0xe0
#define MTS64_CMD_COM_OPEN         0xf8  /* setting the communication mode */
#define MTS64_CMD_COM_CLOSE1       0xff  /* clearing communication mode */
#define MTS64_CMD_COM_CLOSE2       0xf5

/*********************************************************************
 * Hardware specific functions
 *********************************************************************/
static void mts64_enable_readout(struct parport *p);
static void mts64_disable_readout(struct parport *p);
static int mts64_device_ready(struct parport *p);
static int mts64_device_init(struct parport *p);
static int mts64_device_open(struct mts64 *mts);
static int mts64_device_close(struct mts64 *mts);
static u8 mts64_map_midi_input(u8 c);
static int mts64_probe(struct parport *p);
static u16 mts64_read(struct parport *p);
static u8 mts64_read_char(struct parport *p);
static void mts64_smpte_start(struct parport