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linux-next/sound/oss/mpu401.c
Rickard Strandqvist a53613a67e sound: oss: mpu401.c: Cleaning up variable is set more than once 
A struct member variable is set to the same value more than once

This was found using a static code analysis program called cppcheck.

Signed-off-by: Rickard Strandqvist <rickard_strandqvist@spectrumdigital.se>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
2014-06-25 14:32:03 +02:00

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/*
* sound/oss/mpu401.c
*
* The low level driver for Roland MPU-401 compatible Midi cards.
*/
/*
* Copyright (C) by Hannu Savolainen 1993-1997
*
* OSS/Free for Linux is distributed under the GNU GENERAL PUBLIC LICENSE (GPL)
* Version 2 (June 1991). See the "COPYING" file distributed with this software
* for more info.
*
*
* Thomas Sailer ioctl code reworked (vmalloc/vfree removed)
* Alan Cox modularisation, use normal request_irq, use dev_id
* Bartlomiej Zolnierkiewicz removed some __init to allow using many drivers
* Chris Rankin Update the module-usage counter for the coprocessor
* Zwane Mwaikambo Changed attach/unload resource freeing
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#define USE_SEQ_MACROS
#define USE_SIMPLE_MACROS
#include "sound_config.h"
#include "coproc.h"
#include "mpu401.h"
static int timer_mode = TMR_INTERNAL, timer_caps = TMR_INTERNAL;
struct mpu_config
{
int base; /*
* I/O base
*/
int irq;
int opened; /*
* Open mode
*/
int devno;
int synthno;
int uart_mode;
int initialized;
int mode;
#define MODE_MIDI 1
#define MODE_SYNTH 2
unsigned char version, revision;
unsigned int capabilities;
#define MPU_CAP_INTLG 0x10000000
#define MPU_CAP_SYNC 0x00000010
#define MPU_CAP_FSK 0x00000020
#define MPU_CAP_CLS 0x00000040
#define MPU_CAP_SMPTE 0x00000080
#define MPU_CAP_2PORT 0x00000001
int timer_flag;
#define MBUF_MAX 10
#define BUFTEST(dc) if (dc->m_ptr >= MBUF_MAX || dc->m_ptr < 0) \
{printk( "MPU: Invalid buffer pointer %d/%d, s=%d\n", dc->m_ptr, dc->m_left, dc->m_state);dc->m_ptr--;}
int m_busy;
unsigned char m_buf[MBUF_MAX];
int m_ptr;
int m_state;
int m_left;
unsigned char last_status;
void (*inputintr) (int dev, unsigned char data);
int shared_irq;
int *osp;
spinlock_t lock;
};
#define DATAPORT(base) (base)
#define COMDPORT(base) (base+1)
#define STATPORT(base) (base+1)
static void mpu401_close(int dev);
static inline int mpu401_status(struct mpu_config *devc)
{
return inb(STATPORT(devc->base));
}
#define input_avail(devc) (!(mpu401_status(devc)&INPUT_AVAIL))
#define output_ready(devc) (!(mpu401_status(devc)&OUTPUT_READY))
static inline void write_command(struct mpu_config *devc, unsigned char cmd)
{
outb(cmd, COMDPORT(devc->base));
}
static inline int read_data(struct mpu_config *devc)
{
return inb(DATAPORT(devc->base));
}
static inline void write_data(struct mpu_config *devc, unsigned char byte)
{
outb(byte, DATAPORT(devc->base));
}
#define OUTPUT_READY 0x40
#define INPUT_AVAIL 0x80
#define MPU_ACK 0xFE
#define MPU_RESET 0xFF
#define UART_MODE_ON 0x3F
static struct mpu_config dev_conf[MAX_MIDI_DEV];
static int n_mpu_devs;
static int reset_mpu401(struct mpu_config *devc);
static void set_uart_mode(int dev, struct mpu_config *devc, int arg);
static int mpu_timer_init(int midi_dev);
static void mpu_timer_interrupt(void);
static void timer_ext_event(struct mpu_config *devc, int event, int parm);
static struct synth_info mpu_synth_info_proto = {
"MPU-401 MIDI interface",
0,
SYNTH_TYPE_MIDI,
MIDI_TYPE_MPU401,
0, 128,
0, 128,
SYNTH_CAP_INPUT
};
static struct synth_info mpu_synth_info[MAX_MIDI_DEV];
/*
* States for the input scanner
*/
#define ST_INIT 0 /* Ready for timing byte or msg */
#define ST_TIMED 1 /* Leading timing byte rcvd */
#define ST_DATABYTE 2 /* Waiting for (nr_left) data bytes */
#define ST_SYSMSG 100 /* System message (sysx etc). */
#define ST_SYSEX 101 /* System exclusive msg */
#define ST_MTC 102 /* Midi Time Code (MTC) qframe msg */
#define ST_SONGSEL 103 /* Song select */
#define ST_SONGPOS 104 /* Song position pointer */
static unsigned char len_tab[] = /* # of data bytes following a status
*/
{
2, /* 8x */
2, /* 9x */
2, /* Ax */
2, /* Bx */
1, /* Cx */
1, /* Dx */
2, /* Ex */
0 /* Fx */
};
#define STORE(cmd) \
{ \
int len; \
unsigned char obuf[8]; \
cmd; \
seq_input_event(obuf, len); \
}
#define _seqbuf obuf
#define _seqbufptr 0
#define _SEQ_ADVBUF(x) len=x
static int mpu_input_scanner(struct mpu_config *devc, unsigned char midic)
{
switch (devc->m_state)
{
case ST_INIT:
switch (midic)
{
case 0xf8:
/* Timer overflow */
break;
case 0xfc:
printk("<all end>");
break;
case 0xfd:
if (devc->timer_flag)
mpu_timer_interrupt();
break;
case 0xfe:
return MPU_ACK;
case 0xf0:
case 0xf1:
case 0xf2:
case 0xf3:
case 0xf4:
case 0xf5:
case 0xf6:
case 0xf7:
printk("<Trk data rq #%d>", midic & 0x0f);
break;
case 0xf9:
printk("<conductor rq>");
break;
case 0xff:
devc->m_state = ST_SYSMSG;
break;
default:
if (midic <= 0xef)
{
/* printk( "mpu time: %d ", midic); */
devc->m_state = ST_TIMED;
}
else
printk("<MPU: Unknown event %02x> ", midic);
}
break;
case ST_TIMED:
{
int msg = ((int) (midic & 0xf0) >> 4);
devc->m_state = ST_DATABYTE;
if (msg < 8) /* Data byte */
{
/* printk( "midi msg (running status) "); */
msg = ((int) (devc->last_status & 0xf0) >> 4);
msg -= 8;
devc->m_left = len_tab[msg] - 1;
devc->m_ptr = 2;
devc->m_buf[0] = devc->last_status;
devc->m_buf[1] = midic;
if (devc->m_left <= 0)
{
devc->m_state = ST_INIT;
do_midi_msg(devc->synthno, devc->m_buf, devc->m_ptr);
devc->m_ptr = 0;
}
}
else if (msg == 0xf) /* MPU MARK */
{
devc->m_state = ST_INIT;
switch (midic)
{
case 0xf8:
/* printk( "NOP "); */
break;
case 0xf9:
/* printk( "meas end "); */
break;
case 0xfc:
/* printk( "data end "); */
break;
default:
printk("Unknown MPU mark %02x\n", midic);
}
}
else
{
devc->last_status = midic;
/* printk( "midi msg "); */
msg -= 8;
devc->m_left = len_tab[msg];
devc->m_ptr = 1;
devc->m_buf[0] = midic;
if (devc->m_left <= 0)
{
devc->m_state = ST_INIT;
do_midi_msg(devc->synthno, devc->m_buf, devc->m_ptr);
devc->m_ptr = 0;
}
}
}
break;
case ST_SYSMSG:
switch (midic)
{
case 0xf0:
printk("<SYX>");
devc->m_state = ST_SYSEX;
break;
case 0xf1:
devc->m_state = ST_MTC;
break;
case 0xf2:
devc->m_state = ST_SONGPOS;
devc->m_ptr = 0;
break;
case 0xf3:
devc->m_state = ST_SONGSEL;
break;
case 0xf6:
/* printk( "tune_request\n"); */
devc->m_state = ST_INIT;
break;
/*
* Real time messages
*/
case 0xf8:
/* midi clock */
devc->m_state = ST_INIT;
timer_ext_event(devc, TMR_CLOCK, 0);
break;
case 0xfA:
devc->m_state = ST_INIT;
timer_ext_event(devc, TMR_START, 0);
break;
case 0xFB:
devc->m_state = ST_INIT;
timer_ext_event(devc, TMR_CONTINUE, 0);
break;
case 0xFC:
devc->m_state = ST_INIT;
timer_ext_event(devc, TMR_STOP, 0);
break;
case 0xFE:
/* active sensing */
devc->m_state = ST_INIT;
break;
case 0xff:
/* printk( "midi hard reset"); */
devc->m_state = ST_INIT;
break;
default:
printk("unknown MIDI sysmsg %0x\n", midic);
devc->m_state = ST_INIT;
}
break;
case ST_MTC:
devc->m_state = ST_INIT;
printk("MTC frame %x02\n", midic);
break;
case ST_SYSEX:
if (midic == 0xf7)
{
printk("<EOX>");
devc->m_state = ST_INIT;
}
else
printk("%02x ", midic);
break;
case ST_SONGPOS:
BUFTEST(devc);
devc->m_buf[devc->m_ptr++] = midic;
if (devc->m_ptr == 2)
{
devc->m_state = ST_INIT;
devc->m_ptr = 0;
timer_ext_event(devc, TMR_SPP,
((devc->m_buf[1] & 0x7f) << 7) |
(devc->m_buf[0] & 0x7f));
}
break;
case ST_DATABYTE:
BUFTEST(devc);
devc->m_buf[devc->m_ptr++] = midic;
if ((--devc->m_left) <= 0)
{
devc->m_state = ST_INIT;
do_midi_msg(devc->synthno, devc->m_buf, devc->m_ptr);
devc->m_ptr = 0;
}
break;
default:
printk("Bad state %d ", devc->m_state);
devc->m_state = ST_INIT;
}
return 1;
}
static void mpu401_input_loop(struct mpu_config *devc)
{
unsigned long flags;
int busy;
int n;
spin_lock_irqsave(&devc->lock,flags);
busy = devc->m_busy;
devc->m_busy = 1;
spin_unlock_irqrestore(&devc->lock,flags);
if (busy) /* Already inside the scanner */
return;
n = 50;
while (input_avail(devc) && n-- > 0)
{
unsigned char c = read_data(devc);
if (devc->mode == MODE_SYNTH)
{
mpu_input_scanner(devc, c);
}
else if (devc->opened & OPEN_READ && devc->inputintr != NULL)
devc->inputintr(devc->devno, c);
}
devc->m_busy = 0;
}
static irqreturn_t mpuintr(int irq, void *dev_id)
{
struct mpu_config *devc;
int dev = (int)(unsigned long) dev_id;
int handled = 0;
devc = &dev_conf[dev];
if (input_avail(devc))
{
handled = 1;
if (devc->base != 0 && (devc->opened & OPEN_READ || devc->mode == MODE_SYNTH))
mpu401_input_loop(devc);
else
{
/* Dummy read (just to acknowledge the interrupt) */
read_data(devc);
}
}
return IRQ_RETVAL(handled);
}
static int mpu401_open(int dev, int mode,
void (*input) (int dev, unsigned char data),
void (*output) (int dev)
)
{
int err;
struct mpu_config *devc;
struct coproc_operations *coprocessor;
if (dev < 0 || dev >= num_midis || midi_devs[dev] == NULL)
return -ENXIO;
devc = &dev_conf[dev];
if (devc->opened)
return -EBUSY;
/*
* Verify that the device is really running.
* Some devices (such as Ensoniq SoundScape don't
* work before the on board processor (OBP) is initialized
* by downloading its microcode.
*/
if (!devc->initialized)
{
if (mpu401_status(devc) == 0xff) /* Bus float */
{
printk(KERN_ERR "mpu401: Device not initialized properly\n");
return -EIO;
}
reset_mpu401(devc);
}
if ( (coprocessor = midi_devs[dev]->coproc) != NULL )
{
if (!try_module_get(coprocessor->owner)) {
mpu401_close(dev);
return -ENODEV;
}
if ((err = coprocessor->open(coprocessor->devc, COPR_MIDI)) < 0)
{
printk(KERN_WARNING "MPU-401: Can't access coprocessor device\n");
mpu401_close(dev);
return err;
}
}
set_uart_mode(dev, devc, 1);
devc->mode = MODE_MIDI;
devc->synthno = 0;
mpu401_input_loop(devc);
devc->inputintr = input;
devc->opened = mode;
return 0;
}
static void mpu401_close(int dev)
{
struct mpu_config *devc;
struct coproc_operations *coprocessor;
devc = &dev_conf[dev];
if (devc->uart_mode)
reset_mpu401(devc); /*
* This disables the UART mode
*/
devc->mode = 0;
devc->inputintr = NULL;
coprocessor = midi_devs[dev]->coproc;
if (coprocessor) {
coprocessor->close(coprocessor->devc, COPR_MIDI);
module_put(coprocessor->owner);
}
devc->opened = 0;
}
static int mpu401_out(int dev, unsigned char midi_byte)
{
int timeout;
unsigned long flags;
struct mpu_config *devc;
devc = &dev_conf[dev];
/*
* Sometimes it takes about 30000 loops before the output becomes ready
* (After reset). Normally it takes just about 10 loops.
*/
for (timeout = 30000; timeout > 0 && !output_ready(devc); timeout--);
spin_lock_irqsave(&devc->lock,flags);
if (!output_ready(devc))
{
printk(KERN_WARNING "mpu401: Send data timeout\n");
spin_unlock_irqrestore(&devc->lock,flags);
return 0;
}
write_data(devc, midi_byte);
spin_unlock_irqrestore(&devc->lock,flags);
return 1;
}
static int mpu401_command(int dev, mpu_command_rec * cmd)
{
int i, timeout, ok;
unsigned long flags;
struct mpu_config *devc;
devc = &dev_conf[dev];
if (devc->uart_mode) /*
* Not possible in UART mode
*/
{
printk(KERN_WARNING "mpu401: commands not possible in the UART mode\n");
return -EINVAL;
}
/*
* Test for input since pending input seems to block the output.
*/
if (input_avail(devc))
mpu401_input_loop(devc);
/*
* Sometimes it takes about 50000 loops before the output becomes ready
* (After reset). Normally it takes just about 10 loops.
*/
timeout = 50000;
retry:
if (timeout-- <= 0)
{
printk(KERN_WARNING "mpu401: Command (0x%x) timeout\n", (int) cmd->cmd);
return -EIO;
}
spin_lock_irqsave(&devc->lock,flags);
if (!output_ready(devc))
{
spin_unlock_irqrestore(&devc->lock,flags);
goto retry;
}
write_command(devc, cmd->cmd);
ok = 0;
for (timeout = 50000; timeout > 0 && !ok; timeout--)
{
if (input_avail(devc))
{
if (devc->opened && devc->mode == MODE_SYNTH)
{
if (mpu_input_scanner(devc, read_data(devc)) == MPU_ACK)
ok = 1;
}
else
{
/* Device is not currently open. Use simpler method */
if (read_data(devc) == MPU_ACK)
ok = 1;
}
}
}
if (!ok)
{
spin_unlock_irqrestore(&devc->lock,flags);
return -EIO;
}
if (cmd->nr_args)
{
for (i = 0; i < cmd->nr_args; i++)
{
for (timeout = 3000; timeout > 0 && !output_ready(devc); timeout--);
if (!mpu401_out(dev, cmd->data[i]))
{
spin_unlock_irqrestore(&devc->lock,flags);
printk(KERN_WARNING "mpu401: Command (0x%x), parm send failed.\n", (int) cmd->cmd);
return -EIO;
}
}
}
cmd->data[0] = 0;
if (cmd->nr_returns)
{
for (i = 0; i < cmd->nr_returns; i++)
{
ok = 0;
for (timeout = 5000; timeout > 0 && !ok; timeout--)
if (input_avail(devc))
{
cmd->data[i] = read_data(devc);
ok = 1;
}
if (!ok)
{
spin_unlock_irqrestore(&devc->lock,flags);
return -EIO;
}
}
}
spin_unlock_irqrestore(&devc->lock,flags);
return 0;
}
static int mpu_cmd(int dev, int cmd, int data)
{
int ret;
static mpu_command_rec rec;
rec.cmd = cmd & 0xff;
rec.nr_args = ((cmd & 0xf0) == 0xE0);
rec.nr_returns = ((cmd & 0xf0) == 0xA0);
rec.data[0] = data & 0xff;
if ((ret = mpu401_command(dev, &rec)) < 0)
return ret;
return (unsigned char) rec.data[0];
}
static int mpu401_prefix_cmd(int dev, unsigned char status)
{
struct mpu_config *devc = &dev_conf[dev];
if (devc->uart_mode)
return 1;
if (status < 0xf0)
{
if (mpu_cmd(dev, 0xD0, 0) < 0)
return 0;
return 1;
}
switch (status)
{
case 0xF0:
if (mpu_cmd(dev, 0xDF, 0) < 0)
return 0;
return 1;
default:
return 0;
}
}
static int mpu401_start_read(int dev)
{
return 0;
}
static int mpu401_end_read(int dev)
{
return 0;
}
static int mpu401_ioctl(int dev, unsigned cmd, void __user *arg)
{
struct mpu_config *devc;
mpu_command_rec rec;
int val, ret;
devc = &dev_conf[dev];
switch (cmd)
{
case SNDCTL_MIDI_MPUMODE:
if (!(devc->capabilities & MPU_CAP_INTLG)) { /* No intelligent mode */
printk(KERN_WARNING "mpu401: Intelligent mode not supported by the HW\n");
return -EINVAL;
}
if (get_user(val, (int __user *)arg))
return -EFAULT;
set_uart_mode(dev, devc, !val);
return 0;
case SNDCTL_MIDI_MPUCMD:
if (copy_from_user(&rec, arg, sizeof(rec)))
return -EFAULT;
if ((ret = mpu401_command(dev, &rec)) < 0)
return ret;
if (copy_to_user(arg, &rec, sizeof(rec)))
return -EFAULT;
return 0;
default:
return -EINVAL;
}
}
static void mpu401_kick(int dev)
{
}
static int mpu401_buffer_status(int dev)
{
return 0; /*
* No data in buffers
*/
}
static int mpu_synth_ioctl(int dev, unsigned int cmd, void __user *arg)
{
int midi_dev;
struct mpu_config *devc;
midi_dev = synth_devs[dev]->midi_dev;
if (midi_dev < 0 || midi_dev >= num_midis || midi_devs[midi_dev] == NULL)
return -ENXIO;
devc = &dev_conf[midi_dev];
switch (cmd)
{
case SNDCTL_SYNTH_INFO:
if (copy_to_user(arg, &mpu_synth_info[midi_dev],
sizeof(struct synth_info)))
return -EFAULT;
return 0;
case SNDCTL_SYNTH_MEMAVL:
return 0x7fffffff;
default:
return -EINVAL;
}
}
static int mpu_synth_open(int dev, int mode)
{
int midi_dev, err;
struct mpu_config *devc;
struct coproc_operations *coprocessor;
midi_dev = synth_devs[dev]->midi_dev;
if (midi_dev < 0 || midi_dev > num_midis || midi_devs[midi_dev] == NULL)
return -ENXIO;
devc = &dev_conf[midi_dev];
/*
* Verify that the device is really running.
* Some devices (such as Ensoniq SoundScape don't
* work before the on board processor (OBP) is initialized
* by downloading its microcode.
*/
if (!devc->initialized)
{
if (mpu401_status(devc) == 0xff) /* Bus float */
{
printk(KERN_ERR "mpu401: Device not initialized properly\n");
return -EIO;
}
reset_mpu401(devc);
}
if (devc->opened)
return -EBUSY;
devc->mode = MODE_SYNTH;
devc->synthno = dev;
devc->inputintr = NULL;
coprocessor = midi_devs[midi_dev]->coproc;
if (coprocessor) {
if (!try_module_get(coprocessor->owner))
return -ENODEV;
if ((err = coprocessor->open(coprocessor->devc, COPR_MIDI)) < 0)
{
printk(KERN_WARNING "mpu401: Can't access coprocessor device\n");
return err;
}
}
devc->opened = mode;
reset_mpu401(devc);
if (mode & OPEN_READ)
{
mpu_cmd(midi_dev, 0x8B, 0); /* Enable data in stop mode */
mpu_cmd(midi_dev, 0x34, 0); /* Return timing bytes in stop mode */
mpu_cmd(midi_dev, 0x87, 0); /* Enable pitch & controller */
}
return 0;
}
static void mpu_synth_close(int dev)
{
int midi_dev;
struct mpu_config *devc;
struct coproc_operations *coprocessor;
midi_dev = synth_devs[dev]->midi_dev;
devc = &dev_conf[midi_dev];
mpu_cmd(midi_dev, 0x15, 0); /* Stop recording, playback and MIDI */
mpu_cmd(midi_dev, 0x8a, 0); /* Disable data in stopped mode */
devc->inputintr = NULL;
coprocessor = midi_devs[midi_dev]->coproc;
if (coprocessor) {
coprocessor->close(coprocessor->devc, COPR_MIDI);
module_put(coprocessor->owner);
}
devc->opened = 0;
devc->mode = 0;
}
#define MIDI_SYNTH_NAME "MPU-401 UART Midi"
#define MIDI_SYNTH_CAPS SYNTH_CAP_INPUT
#include "midi_synth.h"
static struct synth_operations mpu401_synth_proto =
{
.owner = THIS_MODULE,
.id = "MPU401",
.info = NULL,
.midi_dev = 0,
.synth_type = SYNTH_TYPE_MIDI,
.synth_subtype = 0,
.open = mpu_synth_open,
.close = mpu_synth_close,
.ioctl = mpu_synth_ioctl,
.kill_note = midi_synth_kill_note,
.start_note = midi_synth_start_note,
.set_instr = midi_synth_set_instr,
.reset = midi_synth_reset,
.hw_control = midi_synth_hw_control,
.load_patch = midi_synth_load_patch,
.aftertouch = midi_synth_aftertouch,
.controller = midi_synth_controller,
.panning = midi_synth_panning,
.bender = midi_synth_bender,
.setup_voice = midi_synth_setup_voice,
.send_sysex = midi_synth_send_sysex
};
static struct synth_operations *mpu401_synth_operations[MAX_MIDI_DEV];
static struct midi_operations mpu401_midi_proto =
{
.owner = THIS_MODULE,
.info = {"MPU-401 Midi", 0, MIDI_CAP_MPU401, SNDCARD_MPU401},
.in_info = {0},
.open = mpu401_open,
.close = mpu401_close,
.ioctl = mpu401_ioctl,
.outputc = mpu401_out,
.start_read = mpu401_start_read,
.end_read = mpu401_end_read,
.kick = mpu401_kick,
.buffer_status = mpu401_buffer_status,
.prefix_cmd = mpu401_prefix_cmd
};
static struct midi_operations mpu401_midi_operations[MAX_MIDI_DEV];
static void mpu401_chk_version(int n, struct mpu_config *devc)
{
int tmp;
devc->version = devc->revision = 0;
tmp = mpu_cmd(n, 0xAC, 0);
if (tmp < 0)
return;
if ((tmp & 0xf0) > 0x20) /* Why it's larger than 2.x ??? */
return;
devc->version = tmp;
if ((tmp = mpu_cmd(n, 0xAD, 0)) < 0) {
devc->version = 0;
return;
}
devc->revision = tmp;
}
int attach_mpu401(struct address_info *hw_config, struct module *owner)
{
unsigned long flags;
char revision_char;
int m, ret;
struct mpu_config *devc;
hw_config->slots[1] = -1;
m = sound_alloc_mididev();
if (m == -1)
{
printk(KERN_WARNING "MPU-401: Too many midi devices detected\n");
ret = -ENOMEM;
goto out_err;
}
devc = &dev_conf[m];
devc->base = hw_config->io_base;
devc->osp = hw_config->osp;
devc->irq = hw_config->irq;
devc->opened = 0;
devc->uart_mode = 0;
devc->initialized = 0;
devc->version = 0;
devc->revision = 0;
devc->capabilities = 0;
devc->timer_flag = 0;
devc->m_busy = 0;
devc->m_state = ST_INIT;
devc->shared_irq = hw_config->always_detect;
spin_lock_init(&devc->lock);
if (devc->irq < 0)
{
devc->irq *= -1;
devc->shared_irq = 1;
}
if (!hw_config->always_detect)
{
/* Verify the hardware again */
if (!reset_mpu401(devc))
{
printk(KERN_WARNING "mpu401: Device didn't respond\n");
ret = -ENODEV;
goto out_mididev;
}
if (!devc->shared_irq)
{
if (request_irq(devc->irq, mpuintr, 0, "mpu401",
hw_config) < 0)
{
printk(KERN_WARNING "mpu401: Failed to allocate IRQ%d\n", devc->irq);
ret = -ENOMEM;
goto out_mididev;
}
}
spin_lock_irqsave(&devc->lock,flags);
mpu401_chk_version(m, devc);
if (devc->version == 0)
mpu401_chk_version(m, devc);
spin_unlock_irqrestore(&devc->lock, flags);
}
if (devc->version != 0)
if (mpu_cmd(m, 0xC5, 0) >= 0) /* Set timebase OK */
if (mpu_cmd(m, 0xE0, 120) >= 0) /* Set tempo OK */
devc->capabilities |= MPU_CAP_INTLG; /* Supports intelligent mode */
mpu401_synth_operations[m] = kmalloc(sizeof(struct synth_operations), GFP_KERNEL);
if (mpu401_synth_operations[m] == NULL)
{
printk(KERN_ERR "mpu401: Can't allocate memory\n");
ret = -ENOMEM;
goto out_irq;
}
if (!(devc->capabilities & MPU_CAP_INTLG)) /* No intelligent mode */
{
memcpy((char *) mpu401_synth_operations[m],
(char *) &std_midi_synth,
sizeof(struct synth_operations));
}
else
{
memcpy((char *) mpu401_synth_operations[m],
(char *) &mpu401_synth_proto,
sizeof(struct synth_operations));
}
if (owner)
mpu401_synth_operations[m]->owner = owner;
memcpy((char *) &mpu401_midi_operations[m],
(char *) &mpu401_midi_proto,
sizeof(struct midi_operations));
mpu401_midi_operations[m].converter = mpu401_synth_operations[m];
memcpy((char *) &mpu_synth_info[m],
(char *) &mpu_synth_info_proto,
sizeof(struct synth_info));
n_mpu_devs++;
if (devc->version == 0x20 && devc->revision >= 0x07) /* MusicQuest interface */
{
int ports = (devc->revision & 0x08) ? 32 : 16;
devc->capabilities |= MPU_CAP_SYNC | MPU_CAP_SMPTE |
MPU_CAP_CLS | MPU_CAP_2PORT;
revision_char = (devc->revision == 0x7f) ? 'M' : ' ';
sprintf(mpu_synth_info[m].name, "MQX-%d%c MIDI Interface #%d",
ports,
revision_char,
n_mpu_devs);
}
else
{
revision_char = devc->revision ? devc->revision + '@' : ' ';
if ((int) devc->revision > ('Z' - '@'))
revision_char = '+';
devc->capabilities |= MPU_CAP_SYNC | MPU_CAP_FSK;
if (hw_config->name)
sprintf(mpu_synth_info[m].name, "%s (MPU401)", hw_config->name);
else
sprintf(mpu_synth_info[m].name,
"MPU-401 %d.%d%c MIDI #%d",
(int) (devc->version & 0xf0) >> 4,
devc->version & 0x0f,
revision_char,
n_mpu_devs);
}
strcpy(mpu401_midi_operations[m].info.name,
mpu_synth_info[m].name);
conf_printf(mpu_synth_info[m].name, hw_config);
mpu401_synth_operations[m]->midi_dev = devc->devno = m;
mpu401_synth_operations[devc->devno]->info = &mpu_synth_info[devc->devno];
if (devc->capabilities & MPU_CAP_INTLG) /* Intelligent mode */
hw_config->slots[2] = mpu_timer_init(m);
midi_devs[m] = &mpu401_midi_operations[devc->devno];
if (owner)
midi_devs[m]->owner = owner;
hw_config->slots[1] = m;
sequencer_init();
return 0;
out_irq:
free_irq(devc->irq, hw_config);
out_mididev:
sound_unload_mididev(m);
out_err:
release_region(hw_config->io_base, 2);
return ret;
}
static int reset_mpu401(struct mpu_config *devc)
{
unsigned long flags;
int ok, timeout, n;
int timeout_limit;
/*
* Send the RESET command. Try again if no success at the first time.
* (If the device is in the UART mode, it will not ack the reset cmd).
*/
ok = 0;
timeout_limit = devc->initialized ? 30000 : 100000;
devc->initialized = 1;
for (n = 0; n < 2 && !ok; n++)
{
for (timeout = timeout_limit; timeout > 0 && !ok; timeout--)
ok = output_ready(devc);
write_command(devc, MPU_RESET); /*
* Send MPU-401 RESET Command
*/
/*
* Wait at least 25 msec. This method is not accurate so let's make the
* loop bit longer. Cannot sleep since this is called during boot.
*/
for (timeout = timeout_limit * 2; timeout > 0 && !ok; timeout--)
{
spin_lock_irqsave(&devc->lock,flags);
if (input_avail(devc))
if (read_data(devc) == MPU_ACK)
ok = 1;
spin_unlock_irqrestore(&devc->lock,flags);
}
}
devc->m_state = ST_INIT;
devc->m_ptr = 0;
devc->m_left = 0;
devc->last_status = 0;
devc->uart_mode = 0;
return ok;
}
static void set_uart_mode(int dev, struct mpu_config *devc, int arg)
{
if (!arg && (devc->capabilities & MPU_CAP_INTLG))
return;
if ((devc->uart_mode == 0) == (arg == 0))
return; /* Already set */
reset_mpu401(devc); /* This exits the uart mode */
if (arg)
{
if (mpu_cmd(dev, UART_MODE_ON, 0) < 0)
{
printk(KERN_ERR "mpu401: Can't enter UART mode\n");
devc->uart_mode = 0;
return;
}
}
devc->uart_mode = arg;
}
int probe_mpu401(struct address_info *hw_config, struct resource *ports)
{
int ok = 0;
struct mpu_config tmp_devc;
tmp_devc.base = hw_config->io_base;
tmp_devc.irq = hw_config->irq;
tmp_devc.initialized = 0;
tmp_devc.opened = 0;
tmp_devc.osp = hw_config->osp;
if (hw_config->always_detect)
return 1;
if (inb(hw_config->io_base + 1) == 0xff)
{
DDB(printk("MPU401: Port %x looks dead.\n", hw_config->io_base));
return 0; /* Just bus float? */
}
ok = reset_mpu401(&tmp_devc);
if (!ok)
{
DDB(printk("MPU401: Reset failed on port %x\n", hw_config->io_base));
}
return ok;
}
void unload_mpu401(struct address_info *hw_config)
{
void *p;
int n=hw_config->slots[1];
if (n != -1) {
release_region(hw_config->io_base, 2);
if (hw_config->always_detect == 0 && hw_config->irq > 0)
free_irq(hw_config->irq, hw_config);
p=mpu401_synth_operations[n];
sound_unload_mididev(n);
sound_unload_timerdev(hw_config->slots[2]);
kfree(p);
}
}
/*****************************************************
* Timer stuff
****************************************************/
static volatile int timer_initialized = 0, timer_open = 0, tmr_running = 0;
static volatile int curr_tempo, curr_timebase, hw_timebase;
static int max_timebase = 8; /* 8*24=192 ppqn */
static volatile unsigned long next_event_time;
static volatile unsigned long curr_ticks, curr_clocks;
static unsigned long prev_event_time;
static int metronome_mode;
static unsigned long clocks2ticks(unsigned long clocks)
{
/*
* The MPU-401 supports just a limited set of possible timebase values.
* Since the applications require more choices, the driver has to
* program the HW to do its best and to convert between the HW and
* actual timebases.
*/
return ((clocks * curr_timebase) + (hw_timebase / 2)) / hw_timebase;
}
static void set_timebase(int midi_dev, int val)
{
int hw_val;
if (val < 48)
val = 48;
if (val > 1000)
val = 1000;
hw_val = val;
hw_val = (hw_val + 12) / 24;
if (hw_val > max_timebase)
hw_val = max_timebase;
if (mpu_cmd(midi_dev, 0xC0 | (hw_val & 0x0f), 0) < 0)
{
printk(KERN_WARNING "mpu401: Can't set HW timebase to %d\n", hw_val * 24);
return;
}
hw_timebase = hw_val * 24;
curr_timebase = val;
}
static void tmr_reset(struct mpu_config *devc)
{
unsigned long flags;
spin_lock_irqsave(&devc->lock,flags);
next_event_time = (unsigned long) -1;
prev_event_time = 0;
curr_ticks = curr_clocks = 0;
spin_unlock_irqrestore(&devc->lock,flags);
}
static void set_timer_mode(int midi_dev)
{
if (timer_mode & TMR_MODE_CLS)
mpu_cmd(midi_dev, 0x3c, 0); /* Use CLS sync */
else if (timer_mode & TMR_MODE_SMPTE)
mpu_cmd(midi_dev, 0x3d, 0); /* Use SMPTE sync */
if (timer_mode & TMR_INTERNAL)
{
mpu_cmd(midi_dev, 0x80, 0); /* Use MIDI sync */
}
else
{
if (timer_mode & (TMR_MODE_MIDI | TMR_MODE_CLS))
{
mpu_cmd(midi_dev, 0x82, 0); /* Use MIDI sync */
mpu_cmd(midi_dev, 0x91, 0); /* Enable ext MIDI ctrl */
}
else if (timer_mode & TMR_MODE_FSK)
mpu_cmd(midi_dev, 0x81, 0); /* Use FSK sync */
}
}
static void stop_metronome(int midi_dev)
{
mpu_cmd(midi_dev, 0x84, 0); /* Disable metronome */
}
static void setup_metronome(int midi_dev)
{
int numerator, denominator;
int clks_per_click, num_32nds_per_beat;
int beats_per_measure;
numerator = ((unsigned) metronome_mode >> 24) & 0xff;
denominator = ((unsigned) metronome_mode >> 16) & 0xff;
clks_per_click = ((unsigned) metronome_mode >> 8) & 0xff;
num_32nds_per_beat = (unsigned) metronome_mode & 0xff;
beats_per_measure = (numerator * 4) >> denominator;
if (!metronome_mode)
mpu_cmd(midi_dev, 0x84, 0); /* Disable metronome */
else
{
mpu_cmd(midi_dev, 0xE4, clks_per_click);
mpu_cmd(midi_dev, 0xE6, beats_per_measure);
mpu_cmd(midi_dev, 0x83, 0); /* Enable metronome without accents */
}
}
static int mpu_start_timer(int midi_dev)
{
struct mpu_config *devc= &dev_conf[midi_dev];
tmr_reset(devc);
set_timer_mode(midi_dev);
if (tmr_running)
return TIMER_NOT_ARMED; /* Already running */
if (timer_mode & TMR_INTERNAL)
{
mpu_cmd(midi_dev, 0x02, 0); /* Send MIDI start */
tmr_running = 1;
return TIMER_NOT_ARMED;
}
else
{
mpu_cmd(midi_dev, 0x35, 0); /* Enable mode messages to PC */
mpu_cmd(midi_dev, 0x38, 0); /* Enable sys common messages to PC */
mpu_cmd(midi_dev, 0x39, 0); /* Enable real time messages to PC */
mpu_cmd(midi_dev, 0x97, 0); /* Enable system exclusive messages to PC */
}
return TIMER_ARMED;
}
static int mpu_timer_open(int dev, int mode)
{
int midi_dev = sound_timer_devs[dev]->devlink;
struct mpu_config *devc= &dev_conf[midi_dev];
if (timer_open)
return -EBUSY;
tmr_reset(devc);
curr_tempo = 50;
mpu_cmd(midi_dev, 0xE0, 50);
curr_timebase = hw_timebase = 120;
set_timebase(midi_dev, 120);
timer_open = 1;
metronome_mode = 0;
set_timer_mode(midi_dev);
mpu_cmd(midi_dev, 0xe7, 0x04); /* Send all clocks to host */
mpu_cmd(midi_dev, 0x95, 0); /* Enable clock to host */
return 0;
}
static void mpu_timer_close(int dev)
{
int midi_dev = sound_timer_devs[dev]->devlink;
timer_open = tmr_running = 0;
mpu_cmd(midi_dev, 0x15, 0); /* Stop all */
mpu_cmd(midi_dev, 0x94, 0); /* Disable clock to host */
mpu_cmd(midi_dev, 0x8c, 0); /* Disable measure end messages to host */
stop_metronome(midi_dev);
}
static int mpu_timer_event(int dev, unsigned char *event)
{
unsigned char command = event[1];
unsigned long parm = *(unsigned int *) &event[4];
int midi_dev = sound_timer_devs[dev]->devlink;
switch (command)
{
case TMR_WAIT_REL:
parm += prev_event_time;
case TMR_WAIT_ABS:
if (parm > 0)
{
long time;
if (parm <= curr_ticks) /* It's the time */
return TIMER_NOT_ARMED;
time = parm;
next_event_time = prev_event_time = time;
return TIMER_ARMED;
}
break;
case TMR_START:
if (tmr_running)
break;
return mpu_start_timer(midi_dev);
case TMR_STOP:
mpu_cmd(midi_dev, 0x01, 0); /* Send MIDI stop */
stop_metronome(midi_dev);
tmr_running = 0;
break;
case TMR_CONTINUE:
if (tmr_running)
break;
mpu_cmd(midi_dev, 0x03, 0); /* Send MIDI continue */
setup_metronome(midi_dev);
tmr_running = 1;
break;
case TMR_TEMPO:
if (parm)
{
if (parm < 8)
parm = 8;
if (parm > 250)
parm = 250;
if (mpu_cmd(midi_dev, 0xE0, parm) < 0)
printk(KERN_WARNING "mpu401: Can't set tempo to %d\n", (int) parm);
curr_tempo = parm;
}
break;
case TMR_ECHO:
seq_copy_to_input(event, 8);
break;
case TMR_TIMESIG:
if (metronome_mode) /* Metronome enabled */
{
metronome_mode = parm;
setup_metronome(midi_dev);
}
break;
default:;
}
return TIMER_NOT_ARMED;
}
static unsigned long mpu_timer_get_time(int dev)
{
if (!timer_open)
return 0;
return curr_ticks;
}
static int mpu_timer_ioctl(int dev, unsigned int command, void __user *arg)
{
int midi_dev = sound_timer_devs[dev]->devlink;
int __user *p = (int __user *)arg;
switch (command)
{
case SNDCTL_TMR_SOURCE:
{
int parm;
if (get_user(parm, p))
return -EFAULT;
parm &= timer_caps;
if (parm != 0)
{
timer_mode = parm;
if (timer_mode & TMR_MODE_CLS)
mpu_cmd(midi_dev, 0x3c, 0); /* Use CLS sync */
else if (timer_mode & TMR_MODE_SMPTE)
mpu_cmd(midi_dev, 0x3d, 0); /* Use SMPTE sync */
}
if (put_user(timer_mode, p))
return -EFAULT;
return timer_mode;
}
break;
case SNDCTL_TMR_START:
mpu_start_timer(midi_dev);
return 0;
case SNDCTL_TMR_STOP:
tmr_running = 0;
mpu_cmd(midi_dev, 0x01, 0); /* Send MIDI stop */
stop_metronome(midi_dev);
return 0;
case SNDCTL_TMR_CONTINUE:
if (tmr_running)
return 0;
tmr_running = 1;
mpu_cmd(midi_dev, 0x03, 0); /* Send MIDI continue */
return 0;
case SNDCTL_TMR_TIMEBASE:
{
int val;
if (get_user(val, p))
return -EFAULT;
if (val)
set_timebase(midi_dev, val);
if (put_user(curr_timebase, p))
return -EFAULT;
return curr_timebase;
}
break;
case SNDCTL_TMR_TEMPO:
{
int val;
int ret;
if (get_user(val, p))
return -EFAULT;
if (val)
{
if (val < 8)
val = 8;
if (val > 250)
val = 250;
if ((ret = mpu_cmd(midi_dev, 0xE0, val)) < 0)
{
printk(KERN_WARNING "mpu401: Can't set tempo to %d\n", (int) val);
return ret;
}
curr_tempo = val;
}
if (put_user(curr_tempo, p))
return -EFAULT;
return curr_tempo;
}
break;
case SNDCTL_SEQ_CTRLRATE:
{
int val;
if (get_user(val, p))
return -EFAULT;
if (val != 0) /* Can't change */
return -EINVAL;
val = ((curr_tempo * curr_timebase) + 30)/60;
if (put_user(val, p))
return -EFAULT;
return val;
}
break;
case SNDCTL_SEQ_GETTIME:
if (put_user(curr_ticks, p))
return -EFAULT;
return curr_ticks;
case SNDCTL_TMR_METRONOME:
if (get_user(metronome_mode, p))
return -EFAULT;
setup_metronome(midi_dev);
return 0;
default:;
}
return -EINVAL;
}
static void mpu_timer_arm(int dev, long time)
{
if (time < 0)
time = curr_ticks + 1;
else if (time <= curr_ticks) /* It's the time */
return;
next_event_time = prev_event_time = time;
return;
}
static struct sound_timer_operations mpu_timer =
{
.owner = THIS_MODULE,
.info = {"MPU-401 Timer", 0},
.priority = 10, /* Priority */
.devlink = 0, /* Local device link */
.open = mpu_timer_open,
.close = mpu_timer_close,
.event = mpu_timer_event,
.get_time = mpu_timer_get_time,
.ioctl = mpu_timer_ioctl,
.arm_timer = mpu_timer_arm
};
static void mpu_timer_interrupt(void)
{
if (!timer_open)
return;
if (!tmr_running)
return;
curr_clocks++;
curr_ticks = clocks2ticks(curr_clocks);
if (curr_ticks >= next_event_time)
{
next_event_time = (unsigned long) -1;
sequencer_timer(0);
}
}
static void timer_ext_event(struct mpu_config *devc, int event, int parm)
{
int midi_dev = devc->devno;
if (!devc->timer_flag)
return;
switch (event)
{
case TMR_CLOCK:
printk("<MIDI clk>");
break;
case TMR_START:
printk("Ext MIDI start\n");
if (!tmr_running)
{
if (timer_mode & TMR_EXTERNAL)
{
tmr_running = 1;
setup_metronome(midi_dev);
next_event_time = 0;
STORE(SEQ_START_TIMER());
}
}
break;
case TMR_STOP:
printk("Ext MIDI stop\n");
if (timer_mode & TMR_EXTERNAL)
{
tmr_running = 0;
stop_metronome(midi_dev);
STORE(SEQ_STOP_TIMER());
}
break;
case TMR_CONTINUE:
printk("Ext MIDI continue\n");
if (timer_mode & TMR_EXTERNAL)
{
tmr_running = 1;
setup_metronome(midi_dev);
STORE(SEQ_CONTINUE_TIMER());
}
break;
case TMR_SPP:
printk("Songpos: %d\n", parm);
if (timer_mode & TMR_EXTERNAL)
{
STORE(SEQ_SONGPOS(parm));
}
break;
}
}
static int mpu_timer_init(int midi_dev)
{
struct mpu_config *devc;
int n;
devc = &dev_conf[midi_dev];
if (timer_initialized)
return -1; /* There is already a similar timer */
timer_initialized = 1;
mpu_timer.devlink = midi_dev;
dev_conf[midi_dev].timer_flag = 1;
n = sound_alloc_timerdev();
if (n == -1)
n = 0;
sound_timer_devs[n] = &mpu_timer;
if (devc->version < 0x20) /* Original MPU-401 */
timer_caps = TMR_INTERNAL | TMR_EXTERNAL | TMR_MODE_FSK | TMR_MODE_MIDI;
else
{
/*
* The version number 2.0 is used (at least) by the
* MusicQuest cards and the Roland Super-MPU.
*
* MusicQuest has given a special meaning to the bits of the
* revision number. The Super-MPU returns 0.
*/
if (devc->revision)
timer_caps |= TMR_EXTERNAL | TMR_MODE_MIDI;
if (devc->revision & 0x02)
timer_caps |= TMR_MODE_CLS;
if (devc->revision & 0x40)
max_timebase = 10; /* Has the 216 and 240 ppqn modes */
}
timer_mode = (TMR_INTERNAL | TMR_MODE_MIDI) & timer_caps;
return n;
}
EXPORT_SYMBOL(probe_mpu401);
EXPORT_SYMBOL(attach_mpu401);
EXPORT_SYMBOL(unload_mpu401);
static struct address_info cfg;
static int io = -1;
static int irq = -1;
module_param(irq, int, 0);
module_param(io, int, 0);
static int __init init_mpu401(void)
{
int ret;
/* Can be loaded either for module use or to provide functions
to others */
if (io != -1 && irq != -1) {
struct resource *ports;
cfg.irq = irq;
cfg.io_base = io;
ports = request_region(io, 2, "mpu401");
if (!ports)
return -EBUSY;
if (probe_mpu401(&cfg, ports) == 0) {
release_region(io, 2);
return -ENODEV;
}
if ((ret = attach_mpu401(&cfg, THIS_MODULE)))
return ret;
}
return 0;
}
static void __exit cleanup_mpu401(void)
{
if (io != -1 && irq != -1) {
/* Check for use by, for example, sscape driver */
unload_mpu401(&cfg);
}
}
module_init(init_mpu401);
module_exit(cleanup_mpu401);
#ifndef MODULE
static int __init setup_mpu401(char *str)
{
/* io, irq */
int ints[3];
str = get_options(str, ARRAY_SIZE(ints), ints);
io = ints[1];
irq = ints[2];
return 1;
}
__setup("mpu401=", setup_mpu401);
#endif
MODULE_LICENSE("GPL");
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