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|
/*
* Driver for Midiman Portman2x4 parallel port midi interface
*
* Copyright (c) by Levent Guendogdu <levon@feature-it.com>
*
* 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.
*
* ChangeLog
* Jan 24 2007 Matthias Koenig <mkoenig@suse.de>
* - cleanup and rewrite
* Sep 30 2004 Tobias Gehrig <tobias@gehrig.tk>
* - source code cleanup
* Sep 03 2004 Tobias Gehrig <tobias@gehrig.tk>
* - fixed compilation problem with alsa 1.0.6a (removed MODULE_CLASSES,
* MODULE_PARM_SYNTAX and changed MODULE_DEVICES to
* MODULE_SUPPORTED_DEVICE)
* Mar 24 2004 Tobias Gehrig <tobias@gehrig.tk>
* - added 2.6 kernel support
* Mar 18 2004 Tobias Gehrig <tobias@gehrig.tk>
* - added parport_unregister_driver to the startup routine if the driver fails to detect a portman
* - added support for all 4 output ports in portman_putmidi
* Mar 17 2004 Tobias Gehrig <tobias@gehrig.tk>
* - added checks for opened input device in interrupt handler
* Feb 20 2004 Tobias Gehrig <tobias@gehrig.tk>
* - ported from alsa 0.5 to 1.0
*/
#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 "Portman 2x4"
#define DRIVER_NAME "portman"
#define PLATFORM_DRIVER "snd_portman2x4"
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("Levent Guendogdu, Tobias Gehrig, Matthias Koenig");
MODULE_DESCRIPTION("Midiman Portman2x4");
MODULE_LICENSE("GPL");
MODULE_SUPPORTED_DEVICE("{{Midiman,Portman2x4}}");
/*********************************************************************
* Chip specific
*********************************************************************/
#define PORTMAN_NUM_INPUT_PORTS 2
#define PORTMAN_NUM_OUTPUT_PORTS 4
struct portman {
spinlock_t reg_lock;
struct snd_card *card;
struct snd_rawmidi *rmidi;
struct pardevice *pardev;
int pardev_claimed;
int open_count;
int mode[PORTMAN_NUM_INPUT_PORTS];
struct snd_rawmidi_substream *midi_input[PORTMAN_NUM_INPUT_PORTS];
};
static int portman_free(struct portman *pm)
{
kfree(pm);
return 0;
}
static int __devinit portman_create(struct snd_card *card,
struct pardevice *pardev,
struct portman **rchip)
{
struct portman *pm;
*rchip = NULL;
pm = kzalloc(sizeof(struct portman), GFP_KERNEL);
if (pm == NULL)
return -ENOMEM;
/* Init chip specific data */
spin_lock_init(&pm->reg_lock);
pm->card = card;
pm->pardev = pardev;
*rchip = pm;
return 0;
}
/*********************************************************************
* HW related constants
*********************************************************************/
/* Standard PC parallel port status register equates. */
#define PP_STAT_BSY 0x80 /* Busy status. Inverted. */
#define PP_STAT_ACK 0x40 /* Acknowledge. Non-Inverted. */
#define PP_STAT_POUT 0x20 /* Paper Out. Non-Inverted. */
#define PP_STAT_SEL 0x10 /* Select. Non-Inverted. */
#define PP_STAT_ERR 0x08 /* Error. Non-Inverted. */
/* Standard PC parallel port command register equates. */
#define PP_CMD_IEN 0x10 /* IRQ Enable. Non-Inverted. */
#define PP_CMD_SELI 0x08 /* Select Input. Inverted. */
#define PP_CMD_INIT 0x04 /* Init Printer. Non-Inverted. */
#define PP_CMD_FEED 0x02 /* Auto Feed. Inverted. */
#define PP_CMD_STB 0x01 /* Strobe. Inverted. */
/* Parallel Port Command Register as implemented by PCP2x4. */
#define INT_EN PP_CMD_IEN /* Interrupt enable. */
#define STROBE PP_CMD_STB /* Command strobe. */
/* The parallel port command register field (b1..b3) selects the
* various "registers" within the PC/P 2x4. These are the internal
* address of these "registers" that must be written to the parallel
* port command register.
*/
#define RXDATA0 (0 << 1) /* PCP RxData channel 0. */
#define RXDATA1 (1 << 1) /* PCP RxData channel 1. */
#define GEN_CTL (2 << 1) /* PCP General Control Register. */
#define SYNC_CTL (3 << 1) /* PCP Sync Control Register. */
#define TXDATA0 (4 << 1) /* PCP TxData channel 0. */
#define TXDATA1 (5 << 1) /* PCP TxData channel 1. */
#define TXDATA2 (6 << 1) /* PCP TxData channel 2. */
#define TXDATA3 (7 << 1) /* PCP TxData channel 3. */
/* Parallel Port Status Register as implemented by PCP2x4. */
#define ESTB PP_STAT_POUT /* Echoed strobe. */
#define INT_REQ PP_STAT_ACK /* Input data int request. */
#define BUSY PP_STAT_ERR /* Interface Busy. */
/* Parallel Port Status Register BUSY and SELECT lines are multiplexed
* between several functions. Depending on which 2x4 "register" is
* currently selected (b1..b3), the BUSY and SELECT lines are
* assigned as follows:
*
* SELECT LINE: A3 A2 A1
* --------
*/
#define RXAVAIL PP_STAT_SEL /* Rx Available, channel 0. 0 0 0 */
// RXAVAIL1 PP_STAT_SEL /* Rx Available, channel 1. 0 0 1 */
#define SYNC_STAT PP_STAT_SEL /* Reserved - Sync Status. 0 1 0 */
// /* Reserved. 0 1 1 */
#define TXEMPTY PP_STAT_SEL /* Tx Empty, channel 0. 1 0 0 */
// TXEMPTY1 PP_STAT_SEL /* Tx Empty, channel 1. 1 0 1 */
// TXEMPTY2 PP_STAT_SEL /* Tx Empty, channel 2. 1 1 0 */
// TXEMPTY3 PP_STAT_SEL /* Tx Empty, channel 3. 1 1 1 */
/* BUSY LINE: A3 A2 A1
* --------
*/
#define RXDATA PP_STAT_BSY /* Rx Input Data, channel 0. 0 0 0 */
// RXDATA1 PP_STAT_BSY /* Rx Input Data, channel 1. 0 0 1 */
#define SYNC_DATA PP_STAT_BSY /* Reserved - Sync Data. 0 1 0 */
/* Reserved. 0 1 1 */
#define DATA_ECHO PP_STAT_BSY /* Parallel Port Data Echo. 1 0 0 */
#define A0_ECHO PP_STAT_BSY /* Address 0 Echo. 1 0 1 */
#define A1_ECHO PP_STAT_BSY /* Address 1 Echo. 1 1 0 */
#define A2_ECHO PP_STAT_BSY /* Address 2 Echo. 1 1 1 */
#define PORTMAN2X4_MODE_INPUT_TRIGGERED 0x01
/*********************************************************************
* Hardware specific functions
*********************************************************************/
static inline void portman_write_command(struct portman *pm, u8 value)
{
parport_write_control(pm->pardev->port, value);
}
static inline u8 portman_read_command(struct portman *pm)
{
return parport_read_control(pm->pardev->port);
}
static inline u8 portman_read_status(struct portman *pm)
{
return parport_read_status(pm->pardev->port);
}
static inline u8 portman_read_data(struct portman *pm)
{
return parport_read_data(pm->pardev->port);
}
static inline void portman_write_data(struct portman *pm, u8 value)
{
parport_write_data(pm->pardev->port, value);
}
static void portman_write_midi(struct portman *pm,
int port, u8 mididata)
{
int command = ((port + 4) << 1);
/* Get entering data byte and port number in BL and BH respectively.
* Set up Tx Channel address field for use with PP Cmd Register.
* Store address field in BH register.
* Inputs: AH = Output port number (0..3).
* AL = Data byte.
* command = TXDATA0 | INT_EN;
* Align port num with address field (b1...b3),
* set address for TXDatax, Strobe=0
*/
command |= INT_EN;
/* Disable interrupts so that the process is not interrupted, then
* write the address associated with the current Tx channel to the
* PP Command Reg. Do not set the Strobe signal yet.
*/
do {
portman_write_command(pm, command);
/* While the addr
|