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sscape.c
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/*
* Low-level ALSA driver for the ENSONIQ SoundScape PnP
* Copyright (c) by Chris Rankin
*
* This driver was written in part using information obtained from
* the OSS/Free SoundScape driver, written by Hannu Savolainen.
*
*
* 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 <sound/driver.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/pnp.h>
#include <linux/spinlock.h>
#include <linux/moduleparam.h>
#include <asm/dma.h>
#include <sound/core.h>
#include <sound/hwdep.h>
#include <sound/cs4231.h>
#include <sound/mpu401.h>
#include <sound/initval.h>
#include <sound/sscape_ioctl.h>
MODULE_AUTHOR("Chris Rankin");
MODULE_DESCRIPTION("ENSONIQ SoundScape PnP driver");
MODULE_LICENSE("GPL");
static int index[SNDRV_CARDS] __devinitdata = SNDRV_DEFAULT_IDX;
static char* id[SNDRV_CARDS] __devinitdata = SNDRV_DEFAULT_STR;
static long port[SNDRV_CARDS] __devinitdata = { [0 ... (SNDRV_CARDS-1)] = SNDRV_AUTO_PORT };
static int irq[SNDRV_CARDS] __devinitdata = SNDRV_DEFAULT_IRQ;
static int mpu_irq[SNDRV_CARDS] __devinitdata = SNDRV_DEFAULT_IRQ;
static int dma[SNDRV_CARDS] __devinitdata = SNDRV_DEFAULT_DMA;
module_param_array(index, int, NULL, 0444);
MODULE_PARM_DESC(index, "Index number for SoundScape soundcard");
module_param_array(id, charp, NULL, 0444);
MODULE_PARM_DESC(id, "Description for SoundScape card");
module_param_array(port, long, NULL, 0444);
MODULE_PARM_DESC(port, "Port # for SoundScape driver.");
module_param_array(irq, int, NULL, 0444);
MODULE_PARM_DESC(irq, "IRQ # for SoundScape driver.");
module_param_array(mpu_irq, int, NULL, 0444);
MODULE_PARM_DESC(mpu_irq, "MPU401 IRQ # for SoundScape driver.");
module_param_array(dma, int, NULL, 0444);
MODULE_PARM_DESC(dma, "DMA # for SoundScape driver.");
#ifdef CONFIG_PNP
static struct pnp_card_device_id sscape_pnpids[] = {
{ .id = "ENS3081", .devs = { { "ENS0000" } } },
{ .id = "" } /* end */
};
MODULE_DEVICE_TABLE(pnp_card, sscape_pnpids);
#endif
static snd_card_t *sscape_card[SNDRV_CARDS];
#define MPU401_IO(i) ((i) + 0)
#define MIDI_DATA_IO(i) ((i) + 0)
#define MIDI_CTRL_IO(i) ((i) + 1)
#define HOST_CTRL_IO(i) ((i) + 2)
#define HOST_DATA_IO(i) ((i) + 3)
#define ODIE_ADDR_IO(i) ((i) + 4)
#define ODIE_DATA_IO(i) ((i) + 5)
#define CODEC_IO(i) ((i) + 8)
#define IC_ODIE 1
#define IC_OPUS 2
#define RX_READY 0x01
#define TX_READY 0x02
#define CMD_ACK 0x80
#define CMD_SET_MIDI_VOL 0x84
#define CMD_GET_MIDI_VOL 0x85
#define CMD_XXX_MIDI_VOL 0x86
#define CMD_SET_EXTMIDI 0x8a
#define CMD_GET_EXTMIDI 0x8b
#define CMD_SET_MT32 0x8c
#define CMD_GET_MT32 0x8d
enum GA_REG {
GA_INTSTAT_REG = 0,
GA_INTENA_REG,
GA_DMAA_REG,
GA_DMAB_REG,
GA_INTCFG_REG,
GA_DMACFG_REG,
GA_CDCFG_REG,
GA_SMCFGA_REG,
GA_SMCFGB_REG,
GA_HMCTL_REG
};
#define DMA_8BIT 0x80
#define AD1845_FREQ_SEL_MSB 0x16
#define AD1845_FREQ_SEL_LSB 0x17
struct soundscape {
spinlock_t lock;
unsigned io_base;
int codec_type;
int ic_type;
struct resource *io_res;
cs4231_t *chip;
mpu401_t *mpu;
snd_hwdep_t *hw;
/*
* The MIDI device won't work until we've loaded
* its firmware via a hardware-dependent device IOCTL
*/
spinlock_t fwlock;
int hw_in_use;
unsigned long midi_usage;
unsigned char midi_vol;
};
#define INVALID_IRQ ((unsigned)-1)
static inline struct soundscape *get_card_soundscape(snd_card_t * c)
{
return (struct soundscape *) (c->private_data);
}
static inline struct soundscape *get_mpu401_soundscape(mpu401_t * mpu)
{
return (struct soundscape *) (mpu->private_data);
}
static inline struct soundscape *get_hwdep_soundscape(snd_hwdep_t * hw)
{
return (struct soundscape *) (hw->private_data);
}
/*
* Allocates some kernel memory that we can use for DMA.
* I think this means that the memory has to map to
* contiguous pages of physical memory.
*/
static struct snd_dma_buffer *get_dmabuf(struct snd_dma_buffer *buf, unsigned long size)
{
if (buf) {
if (snd_dma_alloc_pages_fallback(SNDRV_DMA_TYPE_DEV, snd_dma_isa_data(),
size, buf) < 0) {
snd_printk(KERN_ERR "sscape: Failed to allocate %lu bytes for DMA\n", size);
return NULL;
}
}
return buf;
}
/*
* Release the DMA-able kernel memory ...
*/
static void free_dmabuf(struct snd_dma_buffer *buf)
{
if (buf && buf->area)
snd_dma_free_pages(buf);
}
/*
* This function writes to the SoundScape's control registers,
* but doesn't do any locking. It's up to the caller to do that.
* This is why this function is "unsafe" ...
*/
static inline void sscape_write_unsafe(unsigned io_base, enum GA_REG reg, unsigned char val)
{
outb(reg, ODIE_ADDR_IO(io_base));
outb(val, ODIE_DATA_IO(io_base));
}
/*
* Write to the SoundScape's control registers, and do the
* necessary locking ...
*/
static void sscape_write(struct soundscape *s, enum GA_REG reg, unsigned char val)
{
unsigned long flags;
spin_lock_irqsave(&s->lock, flags);
sscape_write_unsafe(s->io_base, reg, val);
spin_unlock_irqrestore(&s->lock, flags);
}
/*
* Read from the SoundScape's control registers, but leave any
* locking to the caller. This is why the function is "unsafe" ...
*/
static inline unsigned char sscape_read_unsafe(unsigned io_base, enum GA_REG reg)
{
outb(reg, ODIE_ADDR_IO(io_base));
return inb(ODIE_DATA_IO(io_base));
}
/*
* Puts the SoundScape into "host" mode, as compared to "MIDI" mode
*/
static inline void set_host_mode_unsafe(unsigned io_base)
{
outb(0x0, HOST_CTRL_IO(io_base));
}
/*
* Puts the SoundScape into "MIDI" mode, as compared to "host" mode
*/
static inline void set_midi_mode_unsafe(unsigned io_base)
{
outb(0x3, HOST_CTRL_IO(io_base));
}
/*
* Read the SoundScape's host-mode control register, but leave
* any locking issues to the caller ...
*/
static inline int host_read_unsafe(unsigned io_base)
{
int data = -1;
if ((inb(HOST_CTRL_IO(io_base)) & RX_READY) != 0) {
data = inb(HOST_DATA_IO(io_base));
}
return data;
}
/*
* Read the SoundScape's host-mode control register, performing
* a limited amount of busy-waiting if the register isn't ready.
* Also leaves all locking-issues to the caller ...
*/
static int host_read_ctrl_unsafe(unsigned io_base, unsigned timeout)
{
int data;
while (((data = host_read_unsafe(io_base)) < 0) && (timeout != 0)) {
udelay(100);
--timeout;
} /* while */
return data;
}
/*
* Write to the SoundScape's host-mode control registers, but
* leave any locking issues to the caller ...
*/
static inline int host_write_unsafe(unsigned io_base, unsigned char data)
{
if ((inb(HOST_CTRL_IO(io_base)) & TX_READY) != 0) {
outb(data, HOST_DATA_IO(io_base));
return 1;
}
return 0;
}
/*
* Write to the SoundScape's host-mode control registers, performing
* a limited amount of busy-waiting if the register isn't ready.
* Also leaves all locking-issues to the caller ...
*/
static int host_write_ctrl_unsafe(unsigned io_base, unsigned char data,
unsigned timeout)
{
int err;
while (!(err = host_write_unsafe(io_base, data)) && (timeout != 0)) {
udelay(100);
--timeout;
} /* while */
return err;
}
/*
* Check that the MIDI subsystem is operational. If it isn't,
* then we will hang the computer if we try to use it ...
*
* NOTE: This check is based upon observation, not documentation.
*/
static inline int verify_mpu401(const mpu401_t * mpu)
{
return ((inb(MIDI_CTRL_IO(mpu->port)) & 0xc0) == 0x80);
}
/*
* This is apparently the standard way to initailise an MPU-401
*/
static inline void initialise_mpu401(const mpu401_t * mpu)
{
outb(0, MIDI_DATA_IO(mpu->port));
}
/*
* Tell the SoundScape to activate the AD1845 chip (I think).
* The AD1845 detection fails if we *don't* do this, so I
* think that this is a good idea ...
*/
static inline void activate_ad1845_unsafe(unsigned io_base)
{
sscape_write_unsafe(io_base, GA_HMCTL_REG, (sscape_read_unsafe(io_base, GA_HMCTL_REG) & 0xcf) | 0x10);
sscape_write_unsafe(io_base, GA_CDCFG_REG, 0x80);
}
/*
* Do the necessary ALSA-level cleanup to deallocate our driver ...
*/
static void soundscape_free(snd_card_t * c)
{
register struct soundscape *sscape = get_card_soundscape(c);
release_resource(sscape->io_res);
kfree_nocheck(sscape->io_res);
free_dma(sscape->chip->dma1);
}
/*
* Put this process into an idle wait-state for a certain number
* of "jiffies". The process can almost certainly be rescheduled
* while we're waiting, and so we must NOT be holding any spinlocks
* when we call this function. If we are then we risk DEADLOCK in
* SMP (Ha!) or pre-emptible kernels.
*/
static inline void sleep(long jiffs, int state)
{
set_current_state(state);
schedule_timeout(jiffs);
}
/*
* Tell the SoundScape to begin a DMA tranfer using the given channel.
* All locking issues are left to the caller.
*/
static inline void sscape_start_dma_unsafe(unsigned io_base, enum GA_REG reg)
{
sscape_write_unsafe(io_base, reg, sscape_read_unsafe(io_base, reg) | 0x01);
sscape_write_unsafe(io_base, reg, sscape_read_unsafe(io_base, reg) & 0xfe);
}
/*
* Wait for a DMA transfer to complete. This is a "limited busy-wait",
* and all locking issues are left to the caller.
*/
static int sscape_wait_dma_unsafe(unsigned io_base, enum GA_REG reg, unsigned timeout)
{
while (!(sscape_read_unsafe(io_base, reg) & 0x01) && (timeout != 0)) {
udelay(100);
--timeout;
} /* while */
return (sscape_read_unsafe(io_base, reg) & 0x01);
}
/*
* Wait for the On-Board Processor to return its start-up
* acknowledgement sequence. This wait is too long for
* us to perform "busy-waiting", and so we must sleep.
* This in turn means that we must not be holding any
* spinlocks when we call this function.
*/
static int obp_startup_ack(struct soundscape *s, unsigned timeout)
{
while (timeout != 0) {
unsigned long flags;
unsigned char x;
sleep(1, TASK_INTERRUPTIBLE);
spin_lock_irqsave(&s->lock, flags);
x = inb(HOST_DATA_IO(s->io_base));
spin_unlock_irqrestore(&s->lock, flags);
if ((x & 0xfe) == 0xfe)
return 1;
--timeout;
} /* while */
return 0;
}
/*
* Wait for the host to return its start-up acknowledgement
* sequence. This wait is too long for us to perform
* "busy-waiting", and so we must sleep. This in turn means
* that we must not be holding any spinlocks when we call
* this function.
*/
static int host_startup_ack(struct soundscape *s, unsigned timeout)
{
while (timeout != 0) {
unsigned long flags;
unsigned char x;
sleep(1, TASK_INTERRUPTIBLE);
spin_lock_irqsave(&s->lock, flags);
x = inb(HOST_DATA_IO(s->io_base));
spin_unlock_irqrestore(&s->lock, flags);
if (x == 0xfe)
return 1;
--timeout;
} /* while */
return 0;
}
/*
* Upload a byte-stream into the SoundScape using DMA channel A.
*/
static int upload_dma_data(struct soundscape *s,
const unsigned char __user *data,
size_t size)
{
unsigned long flags;
struct snd_dma_buffer dma;
int ret;
if (!get_dmabuf(&dma, PAGE_ALIGN(size)))
return -ENOMEM;
spin_lock_irqsave(&s->lock, flags);
/*
* Reset the board ...
*/
sscape_write_unsafe(s->io_base, GA_HMCTL_REG, sscape_read_unsafe(s->io_base, GA_HMCTL_REG) & 0x3f);
/*
* Enable the DMA channels and configure them ...
*/
sscape_write_unsafe(s->io_base, GA_DMACFG_REG, 0x50);
sscape_write_unsafe(s->io_base, GA_DMAA_REG, (s->chip->dma1 << 4) | DMA_8BIT);
sscape_write_unsafe(s->io_base, GA_DMAB_REG, 0x20);
/*
* Take the board out of reset ...
*/
sscape_write_unsafe(s->io_base, GA_HMCTL_REG, sscape_read_unsafe(s->io_base, GA_HMCTL_REG) | 0x80);
/*
* Upload the user's data (firmware?) to the SoundScape
* board through the DMA channel ...
*/
while (size != 0) {
unsigned long len;
/*
* Apparently, copying to/from userspace can sleep.
* We are therefore forbidden from holding any
* spinlocks while we copy ...
*/
spin_unlock_irqrestore(&s->lock, flags);
/*
* Remember that the data that we want to DMA
* comes from USERSPACE. We have already verified
* the userspace pointer ...
*/
len = min(size, dma.bytes);
len -= __copy_from_user(dma.area, data, len);
data += len;
size -= len;
/*
* Grab that spinlock again, now that we've
* finished copying!
*/
spin_lock_irqsave(&s->lock, flags);
snd_dma_program(s->chip->dma1, dma.addr, len, DMA_MODE_WRITE);
sscape_start_dma_unsafe(s->io_base, GA_DMAA_REG);
if (!sscape_wait_dma_unsafe(s->io_base, GA_DMAA_REG, 5000)) {
/*
* Don't forget to release this spinlock we're holding ...
*/
spin_unlock_irqrestore(&s->lock, flags);
snd_printk(KERN_ERR "sscape: DMA upload has timed out\n");
ret = -EAGAIN;
goto _release_dma;
}
} /* while */
set_host_mode_unsafe(s->io_base);
/*
* Boot the board ... (I think)
*/
sscape_write_unsafe(s->io_base, GA_HMCTL_REG, sscape_read_unsafe(s->io_base, GA_HMCTL_REG) | 0x40);
spin_unlock_irqrestore(&s->lock, flags);
/*
* If all has gone well, then the board should acknowledge
* the new upload and tell us that it has rebooted OK. We
* give it 5 seconds (max) ...
*/
ret = 0;
if (!obp_startup_ack(s, 5)) {
snd_printk(KERN_ERR "sscape: No response from on-board processor after upload\n");
ret = -EAGAIN;
} else if (!host_startup_ack(s, 5)) {
snd_printk(KERN_ERR "sscape: SoundScape failed to initialise\n");
ret = -EAGAIN;
}
_release_dma:
/*
* NOTE!!! We are NOT holding any spinlocks at this point !!!
*/
sscape_write(s, GA_DMAA_REG, (s->ic_type == IC_ODIE ? 0x70 : 0x40));
free_dmabuf(&dma);
return ret;
}
/*
* Upload the bootblock(?) into the SoundScape. The only
* purpose of this block of code seems to be to tell
* us which version of the microcode we should be using.
*
* NOTE: The boot-block data resides in USER-SPACE!!!
* However, we have already verified its memory
* addresses by the time we get here.
*/
static int sscape_upload_bootblock(struct soundscape *sscape, struct sscape_bootblock __user *bb)
{
unsigned long flags;
int data = 0;
int ret;
ret = upload_dma_data(sscape, bb->code, sizeof(bb->code));
spin_lock_irqsave(&sscape->lock, flags);
if (ret == 0) {
data = host_read_ctrl_unsafe(sscape->io_base, 100);
}
set_midi_mode_unsafe(sscape->io_base);
spin_unlock_irqrestore(&sscape->lock, flags);
if (ret == 0) {
if (data < 0) {
snd_printk(KERN_ERR "sscape: timeout reading firmware version\n");
ret = -EAGAIN;
}
else if (__copy_to_user(&bb->version, &data, sizeof(bb->version))) {
ret = -EFAULT;
}
}
return ret;
}
/*
* Upload the microcode into the SoundScape. The
* microcode is 64K of data, and if we try to copy
* it into a local variable then we will SMASH THE
* KERNEL'S STACK! We therefore leave it in USER
* SPACE, and save ourselves from copying it at all.
*/
static int sscape_upload_microcode(struct soundscape *sscape,
const struct sscape_microcode __user *mc)
{
unsigned long flags;
char __user *code;
int err;
/*
* We are going to have to copy this data into a special
* DMA-able buffer before we can upload it. We shall therefore
* just check that the data pointer is valid for now.
*
* NOTE: This buffer is 64K long! That's WAY too big to
* copy into a stack-temporary anyway.
*/
if ( get_user(code, &mc->code) ||
!access_ok(VERIFY_READ, code, SSCAPE_MICROCODE_SIZE) )
return -EFAULT;
if ((err = upload_dma_data(sscape, code, SSCAPE_MICROCODE_SIZE)) == 0) {
snd_printk(KERN_INFO "sscape: MIDI firmware loaded\n");
}
spin_lock_irqsave(&sscape->lock, flags);
set_midi_mode_unsafe(sscape->io_base);
spin_unlock_irqrestore(&sscape->lock, flags);
initialise_mpu401(sscape->mpu);
return err;
}
/*
* Hardware-specific device functions, to implement special
* IOCTLs for the SoundScape card. This is how we upload
* the microcode into the card, for example, and so we
* must ensure that no two processes can open this device
* simultaneously, and that we can't open it at all if
* someone is using the MIDI device.
*/
static int sscape_hw_open(snd_hwdep_t * hw, struct file *file)
{
register struct soundscape *sscape = get_hwdep_soundscape(hw);
unsigned long flags;
int err;
spin_lock_irqsave(&sscape->fwlock, flags);
if ((sscape->midi_usage != 0) || sscape->hw_in_use) {
err = -EBUSY;
} else {
sscape->hw_in_use = 1;
err = 0;
}
spin_unlock_irqrestore(&sscape->fwlock, flags);
return err;
}
static int sscape_hw_release(snd_hwdep_t * hw, struct file *file)
{
register struct soundscape *sscape = get_hwdep_soundscape(hw);
unsigned long flags;
spin_lock_irqsave(&sscape->fwlock, flags);
sscape->hw_in_use = 0;
spin_unlock_irqrestore(&sscape->fwlock, flags);
return 0;
}
static int sscape_hw_ioctl(snd_hwdep_t * hw, struct file *file,
unsigned int cmd, unsigned long arg)
{
struct soundscape *sscape = get_hwdep_soundscape(hw);
int err = -EBUSY;
switch (cmd) {
case SND_SSCAPE_LOAD_BOOTB:
{
register struct sscape_bootblock __user *bb = (struct sscape_bootblock __user *) arg;
/*
* We are going to have to copy this data into a special
* DMA-able buffer before we can upload it. We shall therefore
* just check that the data pointer is valid for now ...
*/
if ( !access_ok(VERIFY_READ, bb->code, sizeof(bb->code)) )
return -EFAULT;
/*
* Now check that we can write the firmware version number too...
*/
if ( !access_ok(VERIFY_WRITE, &bb->version, sizeof(bb->version)) )
return -EFAULT;
err = sscape_upload_bootblock(sscape, bb);
}
break;
case SND_SSCAPE_LOAD_MCODE:
{
register const struct sscape_microcode __user *mc = (const struct sscape_microcode __user *) arg;
err = sscape_upload_microcode(sscape, mc);
}
break;
default:
err = -EINVAL;
break;
} /* switch */
return err;
}
/*
* Mixer control for the SoundScape's MIDI device.
*/
static int sscape_midi_info(snd_kcontrol_t * ctl,
snd_ctl_elem_info_t * uinfo)
{
uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
uinfo->count = 1;
uinfo->value.integer.min = 0;
uinfo->value.integer.max = 127;
return 0;
}
static int sscape_midi_get(snd_kcontrol_t * kctl,
snd_ctl_elem_value_t * uctl)
{
cs4231_t *chip = snd_kcontrol_chip(kctl);
snd_card_t *card = chip->card;
register struct soundscape *s = get_card_soundscape(card);
unsigned long flags;
spin_lock_irqsave(&s->lock, flags);
set_host_mode_unsafe(s->io_base);
if (host_write_ctrl_unsafe(s->io_base, CMD_GET_MIDI_VOL, 100)) {
uctl->value.integer.value[0] = host_read_ctrl_unsafe(s->io_base, 100);
}
set_midi_mode_unsafe(s->io_base);
spin_unlock_irqrestore(&s->lock, flags);
return 0;
}
static int sscape_midi_put(snd_kcontrol_t * kctl,
snd_ctl_elem_value_t * uctl)
{
cs4231_t *chip = snd_kcontrol_chip(kctl);
snd_card_t *card = chip->card;
register struct soundscape *s = get_card_soundscape(card);
unsigned long flags;
int change;
spin_lock_irqsave(&s->lock, flags);
/*
* We need to put the board into HOST mode before we
* can send any volume-changing HOST commands ...
*/
set_host_mode_unsafe(s->io_base);
/*
* To successfully change the MIDI volume setting, you seem to
* have to write a volume command, write the new volume value,
* and then perform another volume-related command. Perhaps the
* first command is an "open" and the second command is a "close"?
*/
if (s->midi_vol == ((unsigned char) uctl->value.integer. value[0] & 127)) {
change = 0;
goto __skip_change;
}
change = (host_write_ctrl_unsafe(s->io_base, CMD_SET_MIDI_VOL, 100)
&& host_write_ctrl_unsafe(s->io_base, ((unsigned char) uctl->value.integer. value[0]) & 127, 100)
&& host_write_ctrl_unsafe(s->io_base, CMD_XXX_MIDI_VOL, 100));
__skip_change:
/*
* Take the board out of HOST mode and back into MIDI mode ...
*/
set_midi_mode_unsafe(s->io_base);
spin_unlock_irqrestore(&s->lock, flags);
return change;
}
static snd_kcontrol_new_t midi_mixer_ctl = {
.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
.name = "MIDI",
.info = sscape_midi_info,
.get = sscape_midi_get,
.put = sscape_midi_put
};
/*
* The SoundScape can use two IRQs from a possible set of four.
* These IRQs are encoded as bit patterns so that they can be
* written to the control registers.
*/
static unsigned __devinit get_irq_config(int irq)
{
static const int valid_irq[] = { 9, 5, 7, 10 };
unsigned cfg;
for (cfg = 0; cfg < ARRAY_SIZE(valid_irq); ++cfg) {
if (irq == valid_irq[cfg])
return cfg;
} /* for */
return INVALID_IRQ;
}
/*
* Perform certain arcane port-checks to see whether there
* is a SoundScape board lurking behind the given ports.
*/
static int __devinit detect_sscape(struct soundscape *s)
{
unsigned long flags;
unsigned d;
int retval = 0;
spin_lock_irqsave(&s->lock, flags);
/*
* The following code is lifted from the original OSS driver,
* and as I don't have a datasheet I cannot really comment
* on what it is doing...
*/
if ((inb(HOST_CTRL_IO(s->io_base)) & 0x78) != 0)
goto _done;
d = inb(ODIE_ADDR_IO(s->io_base)) & 0xf0;
if ((d & 0x80) != 0)
goto _done;
if (d == 0) {
s->codec_type = 1;
s->ic_type = IC_ODIE;
} else if ((d & 0x60) != 0) {
s->codec_type = 2;
s->ic_type = IC_OPUS;
} else
goto _done;
outb(0xfa, ODIE_ADDR_IO(s->io_base));
if ((inb(ODIE_ADDR_IO(s->io_base)) & 0x9f) != 0x0a)
goto _done;
outb(0xfe, ODIE_ADDR_IO(s->io_base));
if ((inb(ODIE_ADDR_IO(s->io_base)) & 0x9f) != 0x0e)
goto _done;
if ((inb(ODIE_DATA_IO(s->io_base)) & 0x9f) != 0x0e)
goto _done;
/*
* SoundScape successfully detected!
*/
retval = 1;
_done:
spin_unlock_irqrestore(&s->lock, flags);
return retval;
}
/*
* ALSA callback function, called when attempting to open the MIDI device.
* Check that the MIDI firmware has been loaded, because we don't want
* to crash the machine. Also check that someone isn't using the hardware
* IOCTL device.
*/
static int mpu401_open(mpu401_t * mpu)
{
int err;
if (!verify_mpu401(mpu)) {
snd_printk(KERN_ERR "sscape: MIDI disabled, please load firmware\n");
err = -ENODEV;
} else {
register struct soundscape *sscape = get_mpu401_soundscape(mpu);
unsigned long flags;
spin_lock_irqsave(&sscape->fwlock, flags);
if (sscape->hw_in_use || (sscape->midi_usage == ULONG_MAX)) {
err = -EBUSY;
} else {
++(sscape->midi_usage);
err = 0;
}
spin_unlock_irqrestore(&sscape->fwlock, flags);
}
return err;
}
static void mpu401_close(mpu401_t * mpu)
{
register struct soundscape *sscape = get_mpu401_soundscape(mpu);
unsigned long flags;
spin_lock_irqsave(&sscape->fwlock, flags);
--(sscape->midi_usage);
spin_unlock_irqrestore(&sscape->fwlock, flags);
}
/*
* Initialse an MPU-401 subdevice for MIDI support on the SoundScape.
*/
static int __devinit create_mpu401(snd_card_t * card, int devnum, unsigned long port, int irq)
{
struct soundscape *sscape = get_card_soundscape(card);
snd_rawmidi_t *rawmidi;
int err;
#define MPU401_SHARE_HARDWARE 1
if ((err = snd_mpu401_uart_new(card, devnum,
MPU401_HW_MPU401,
port, MPU401_SHARE_HARDWARE,
irq, SA_INTERRUPT,
&rawmidi)) == 0) {
mpu401_t *mpu = (mpu401_t *) rawmidi->private_data;
mpu->open_input = mpu401_open;
mpu->open_output = mpu401_open;
mpu->close_input = mpu401_close;
mpu->close_output = mpu401_close;
mpu->private_data = sscape;
sscape->mpu = mpu;
initialise_mpu401(mpu);
}
return err;
}
/*
* Override for the CS4231 playback format function.
* The AD1845 has much simpler format and rate selection.
*/
static void ad1845_playback_format(cs4231_t * chip, snd_pcm_hw_params_t * params, unsigned char format)
{
unsigned long flags;
unsigned rate = params_rate(params);
/*
* The AD1845 can't handle sample frequencies
* outside of 4 kHZ to 50 kHZ
*/
if (rate > 50000)
rate = 50000;
else if (rate < 4000)
rate = 4000;
spin_lock_irqsave(&chip->reg_lock, flags);
/*
* Program the AD1845 correctly for the playback stream.
* Note that we do NOT need to toggle the MCE bit because
* the PLAYBACK_ENABLE bit of the Interface Configuration
* register is set.
*
* NOTE: We seem to need to write to the MSB before the LSB
* to get the correct sample frequency.
*/
snd_cs4231_out(chip, CS4231_PLAYBK_FORMAT, (format & 0xf0));
snd_cs4231_out(chip, AD1845_FREQ_SEL_MSB, (unsigned char) (rate >> 8));
snd_cs4231_out(chip, AD1845_FREQ_SEL_LSB, (unsigned char) rate);
spin_unlock_irqrestore(&chip->reg_lock, flags);
}
/*
* Override for the CS4231 capture format function.
* The AD1845 has much simpler format and rate selection.
*/
static void ad1845_capture_format(cs4231_t * chip, snd_pcm_hw_params_t * params, unsigned char format)
{
unsigned long flags;
unsigned rate = params_rate(params);
/*
* The AD1845 can't handle sample frequencies
* outside of 4 kHZ to 50 kHZ
*/
if (rate > 50000)
rate = 50000;
else if (rate < 4000)
rate = 4000;
spin_lock_irqsave(&chip->reg_lock, flags);
/*
* Program the AD1845 correctly for the playback stream.
* Note that we do NOT need to toggle the MCE bit because
* the CAPTURE_ENABLE bit of the Interface Configuration
* register is set.
*
* NOTE: We seem to need to write to the MSB before the LSB
* to get the correct sample frequency.
*/
snd_cs4231_out(chip, CS4231_REC_FORMAT, (format & 0xf0));
snd_cs4231_out(chip, AD1845_FREQ_SEL_MSB, (unsigned char) (rate >> 8));
snd_cs4231_out(chip, AD1845_FREQ_SEL_LSB, (unsigned char) rate);