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ad1848.c
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ad1848.c
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/*
* sound/oss/ad1848.c
*
* The low level driver for the AD1848/CS4248 codec chip which
* is used for example in the MS Sound System.
*
* The CS4231 which is used in the GUS MAX and some other cards is
* upwards compatible with AD1848 and this driver is able to drive it.
*
* CS4231A and AD1845 are upward compatible with CS4231. However
* the new features of these chips are different.
*
* CS4232 is a PnP audio chip which contains a CS4231A (and SB, MPU).
* CS4232A is an improved version of CS4232.
*
*
*
* 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)
* general sleep/wakeup clean up.
* Alan Cox : reformatted. Fixed SMP bugs. Moved to kernel alloc/free
* of irqs. Use dev_id.
* Christoph Hellwig : adapted to module_init/module_exit
* Aki Laukkanen : added power management support
* Arnaldo C. de Melo : added missing restore_flags in ad1848_resume
* Miguel Freitas : added ISA PnP support
* Alan Cox : Added CS4236->4239 identification
* Daniel T. Cobra : Alernate config/mixer for later chips
* Alan Cox : Merged chip idents and config code
*
* TODO
* APM save restore assist code on IBM thinkpad
*
* Status:
* Tested. Believed fully functional.
*/
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/stddef.h>
#include <linux/isapnp.h>
#include <linux/pnp.h>
#include <linux/spinlock.h>
#define DEB(x)
#define DEB1(x)
#include "sound_config.h"
#include "ad1848.h"
#include "ad1848_mixer.h"
typedef struct
{
spinlock_t lock;
int base;
int irq;
int dma1, dma2;
int dual_dma; /* 1, when two DMA channels allocated */
int subtype;
unsigned char MCE_bit;
unsigned char saved_regs[64]; /* Includes extended register space */
int debug_flag;
int audio_flags;
int record_dev, playback_dev;
int xfer_count;
int audio_mode;
int open_mode;
int intr_active;
char *chip_name, *name;
int model;
#define MD_1848 1
#define MD_4231 2
#define MD_4231A 3
#define MD_1845 4
#define MD_4232 5
#define MD_C930 6
#define MD_IWAVE 7
#define MD_4235 8 /* Crystal Audio CS4235 */
#define MD_1845_SSCAPE 9 /* Ensoniq Soundscape PNP*/
#define MD_4236 10 /* 4236 and higher */
#define MD_42xB 11 /* CS 42xB */
#define MD_4239 12 /* CS4239 */
/* Mixer parameters */
int recmask;
int supported_devices, orig_devices;
int supported_rec_devices, orig_rec_devices;
int *levels;
short mixer_reroute[32];
int dev_no;
volatile unsigned long timer_ticks;
int timer_running;
int irq_ok;
mixer_ents *mix_devices;
int mixer_output_port;
} ad1848_info;
typedef struct ad1848_port_info
{
int open_mode;
int speed;
unsigned char speed_bits;
int channels;
int audio_format;
unsigned char format_bits;
}
ad1848_port_info;
static struct address_info cfg;
static int nr_ad1848_devs;
static int deskpro_xl;
static int deskpro_m;
static int soundpro;
static volatile signed char irq2dev[17] = {
-1, -1, -1, -1, -1, -1, -1, -1,
-1, -1, -1, -1, -1, -1, -1, -1, -1
};
#ifndef EXCLUDE_TIMERS
static int timer_installed = -1;
#endif
static int loaded;
static int ad_format_mask[13 /*devc->model */ ] =
{
0,
AFMT_U8 | AFMT_S16_LE | AFMT_MU_LAW | AFMT_A_LAW,
AFMT_U8 | AFMT_S16_LE | AFMT_MU_LAW | AFMT_A_LAW | AFMT_S16_BE | AFMT_IMA_ADPCM,
AFMT_U8 | AFMT_S16_LE | AFMT_MU_LAW | AFMT_A_LAW | AFMT_S16_BE | AFMT_IMA_ADPCM,
AFMT_U8 | AFMT_S16_LE | AFMT_MU_LAW | AFMT_A_LAW, /* AD1845 */
AFMT_U8 | AFMT_S16_LE | AFMT_MU_LAW | AFMT_A_LAW | AFMT_S16_BE | AFMT_IMA_ADPCM,
AFMT_U8 | AFMT_S16_LE | AFMT_MU_LAW | AFMT_A_LAW | AFMT_S16_BE | AFMT_IMA_ADPCM,
AFMT_U8 | AFMT_S16_LE | AFMT_MU_LAW | AFMT_A_LAW | AFMT_S16_BE | AFMT_IMA_ADPCM,
AFMT_U8 | AFMT_S16_LE /* CS4235 */,
AFMT_U8 | AFMT_S16_LE | AFMT_MU_LAW | AFMT_A_LAW /* Ensoniq Soundscape*/,
AFMT_U8 | AFMT_S16_LE | AFMT_MU_LAW | AFMT_A_LAW | AFMT_S16_BE | AFMT_IMA_ADPCM,
AFMT_U8 | AFMT_S16_LE | AFMT_MU_LAW | AFMT_A_LAW | AFMT_S16_BE | AFMT_IMA_ADPCM,
AFMT_U8 | AFMT_S16_LE | AFMT_MU_LAW | AFMT_A_LAW | AFMT_S16_BE | AFMT_IMA_ADPCM
};
static ad1848_info adev_info[MAX_AUDIO_DEV];
#define io_Index_Addr(d) ((d)->base)
#define io_Indexed_Data(d) ((d)->base+1)
#define io_Status(d) ((d)->base+2)
#define io_Polled_IO(d) ((d)->base+3)
static struct {
unsigned char flags;
#define CAP_F_TIMER 0x01
} capabilities [10 /*devc->model */ ] = {
{0}
,{0} /* MD_1848 */
,{CAP_F_TIMER} /* MD_4231 */
,{CAP_F_TIMER} /* MD_4231A */
,{CAP_F_TIMER} /* MD_1845 */
,{CAP_F_TIMER} /* MD_4232 */
,{0} /* MD_C930 */
,{CAP_F_TIMER} /* MD_IWAVE */
,{0} /* MD_4235 */
,{CAP_F_TIMER} /* MD_1845_SSCAPE */
};
#ifdef CONFIG_PNP
static int isapnp = 1;
static int isapnpjump;
static int reverse;
static int audio_activated;
#else
static int isapnp;
#endif
static int ad1848_open(int dev, int mode);
static void ad1848_close(int dev);
static void ad1848_output_block(int dev, unsigned long buf, int count, int intrflag);
static void ad1848_start_input(int dev, unsigned long buf, int count, int intrflag);
static int ad1848_prepare_for_output(int dev, int bsize, int bcount);
static int ad1848_prepare_for_input(int dev, int bsize, int bcount);
static void ad1848_halt(int dev);
static void ad1848_halt_input(int dev);
static void ad1848_halt_output(int dev);
static void ad1848_trigger(int dev, int bits);
static irqreturn_t adintr(int irq, void *dev_id);
#ifndef EXCLUDE_TIMERS
static int ad1848_tmr_install(int dev);
static void ad1848_tmr_reprogram(int dev);
#endif
static int ad_read(ad1848_info * devc, int reg)
{
int x;
int timeout = 900000;
while (timeout > 0 && inb(devc->base) == 0x80) /*Are we initializing */
timeout--;
if(reg < 32)
{
outb(((unsigned char) (reg & 0xff) | devc->MCE_bit), io_Index_Addr(devc));
x = inb(io_Indexed_Data(devc));
}
else
{
int xreg, xra;
xreg = (reg & 0xff) - 32;
xra = (((xreg & 0x0f) << 4) & 0xf0) | 0x08 | ((xreg & 0x10) >> 2);
outb(((unsigned char) (23 & 0xff) | devc->MCE_bit), io_Index_Addr(devc));
outb(((unsigned char) (xra & 0xff)), io_Indexed_Data(devc));
x = inb(io_Indexed_Data(devc));
}
return x;
}
static void ad_write(ad1848_info * devc, int reg, int data)
{
int timeout = 900000;
while (timeout > 0 && inb(devc->base) == 0x80) /* Are we initializing */
timeout--;
if(reg < 32)
{
outb(((unsigned char) (reg & 0xff) | devc->MCE_bit), io_Index_Addr(devc));
outb(((unsigned char) (data & 0xff)), io_Indexed_Data(devc));
}
else
{
int xreg, xra;
xreg = (reg & 0xff) - 32;
xra = (((xreg & 0x0f) << 4) & 0xf0) | 0x08 | ((xreg & 0x10) >> 2);
outb(((unsigned char) (23 & 0xff) | devc->MCE_bit), io_Index_Addr(devc));
outb(((unsigned char) (xra & 0xff)), io_Indexed_Data(devc));
outb((unsigned char) (data & 0xff), io_Indexed_Data(devc));
}
}
static void wait_for_calibration(ad1848_info * devc)
{
int timeout = 0;
/*
* Wait until the auto calibration process has finished.
*
* 1) Wait until the chip becomes ready (reads don't return 0x80).
* 2) Wait until the ACI bit of I11 gets on and then off.
*/
timeout = 100000;
while (timeout > 0 && inb(devc->base) == 0x80)
timeout--;
if (inb(devc->base) & 0x80)
printk(KERN_WARNING "ad1848: Auto calibration timed out(1).\n");
timeout = 100;
while (timeout > 0 && !(ad_read(devc, 11) & 0x20))
timeout--;
if (!(ad_read(devc, 11) & 0x20))
return;
timeout = 80000;
while (timeout > 0 && (ad_read(devc, 11) & 0x20))
timeout--;
if (ad_read(devc, 11) & 0x20)
if ( (devc->model != MD_1845) || (devc->model != MD_1845_SSCAPE))
printk(KERN_WARNING "ad1848: Auto calibration timed out(3).\n");
}
static void ad_mute(ad1848_info * devc)
{
int i;
unsigned char prev;
/*
* Save old register settings and mute output channels
*/
for (i = 6; i < 8; i++)
{
prev = devc->saved_regs[i] = ad_read(devc, i);
}
}
static void ad_unmute(ad1848_info * devc)
{
}
static void ad_enter_MCE(ad1848_info * devc)
{
int timeout = 1000;
unsigned short prev;
while (timeout > 0 && inb(devc->base) == 0x80) /*Are we initializing */
timeout--;
devc->MCE_bit = 0x40;
prev = inb(io_Index_Addr(devc));
if (prev & 0x40)
{
return;
}
outb((devc->MCE_bit), io_Index_Addr(devc));
}
static void ad_leave_MCE(ad1848_info * devc)
{
unsigned char prev, acal;
int timeout = 1000;
while (timeout > 0 && inb(devc->base) == 0x80) /*Are we initializing */
timeout--;
acal = ad_read(devc, 9);
devc->MCE_bit = 0x00;
prev = inb(io_Index_Addr(devc));
outb((0x00), io_Index_Addr(devc)); /* Clear the MCE bit */
if ((prev & 0x40) == 0) /* Not in MCE mode */
{
return;
}
outb((0x00), io_Index_Addr(devc)); /* Clear the MCE bit */
if (acal & 0x08) /* Auto calibration is enabled */
wait_for_calibration(devc);
}
static int ad1848_set_recmask(ad1848_info * devc, int mask)
{
unsigned char recdev;
int i, n;
unsigned long flags;
mask &= devc->supported_rec_devices;
/* Rename the mixer bits if necessary */
for (i = 0; i < 32; i++)
{
if (devc->mixer_reroute[i] != i)
{
if (mask & (1 << i))
{
mask &= ~(1 << i);
mask |= (1 << devc->mixer_reroute[i]);
}
}
}
n = 0;
for (i = 0; i < 32; i++) /* Count selected device bits */
if (mask & (1 << i))
n++;
spin_lock_irqsave(&devc->lock,flags);
if (!soundpro) {
if (n == 0)
mask = SOUND_MASK_MIC;
else if (n != 1) { /* Too many devices selected */
mask &= ~devc->recmask; /* Filter out active settings */
n = 0;
for (i = 0; i < 32; i++) /* Count selected device bits */
if (mask & (1 << i))
n++;
if (n != 1)
mask = SOUND_MASK_MIC;
}
switch (mask) {
case SOUND_MASK_MIC:
recdev = 2;
break;
case SOUND_MASK_LINE:
case SOUND_MASK_LINE3:
recdev = 0;
break;
case SOUND_MASK_CD:
case SOUND_MASK_LINE1:
recdev = 1;
break;
case SOUND_MASK_IMIX:
recdev = 3;
break;
default:
mask = SOUND_MASK_MIC;
recdev = 2;
}
recdev <<= 6;
ad_write(devc, 0, (ad_read(devc, 0) & 0x3f) | recdev);
ad_write(devc, 1, (ad_read(devc, 1) & 0x3f) | recdev);
} else { /* soundpro */
unsigned char val;
int set_rec_bit;
int j;
for (i = 0; i < 32; i++) { /* For each bit */
if ((devc->supported_rec_devices & (1 << i)) == 0)
continue; /* Device not supported */
for (j = LEFT_CHN; j <= RIGHT_CHN; j++) {
if (devc->mix_devices[i][j].nbits == 0) /* Inexistent channel */
continue;
/*
* This is tricky:
* set_rec_bit becomes 1 if the corresponding bit in mask is set
* then it gets flipped if the polarity is inverse
*/
set_rec_bit = ((mask & (1 << i)) != 0) ^ devc->mix_devices[i][j].recpol;
val = ad_read(devc, devc->mix_devices[i][j].recreg);
val &= ~(1 << devc->mix_devices[i][j].recpos);
val |= (set_rec_bit << devc->mix_devices[i][j].recpos);
ad_write(devc, devc->mix_devices[i][j].recreg, val);
}
}
}
spin_unlock_irqrestore(&devc->lock,flags);
/* Rename the mixer bits back if necessary */
for (i = 0; i < 32; i++)
{
if (devc->mixer_reroute[i] != i)
{
if (mask & (1 << devc->mixer_reroute[i]))
{
mask &= ~(1 << devc->mixer_reroute[i]);
mask |= (1 << i);
}
}
}
devc->recmask = mask;
return mask;
}
static void change_bits(ad1848_info * devc, unsigned char *regval,
unsigned char *muteval, int dev, int chn, int newval)
{
unsigned char mask;
int shift;
int mute;
int mutemask;
int set_mute_bit;
set_mute_bit = (newval == 0) ^ devc->mix_devices[dev][chn].mutepol;
if (devc->mix_devices[dev][chn].polarity == 1) /* Reverse */
newval = 100 - newval;
mask = (1 << devc->mix_devices[dev][chn].nbits) - 1;
shift = devc->mix_devices[dev][chn].bitpos;
if (devc->mix_devices[dev][chn].mutepos == 8)
{ /* if there is no mute bit */
mute = 0; /* No mute bit; do nothing special */
mutemask = ~0; /* No mute bit; do nothing special */
}
else
{
mute = (set_mute_bit << devc->mix_devices[dev][chn].mutepos);
mutemask = ~(1 << devc->mix_devices[dev][chn].mutepos);
}
newval = (int) ((newval * mask) + 50) / 100; /* Scale it */
*regval &= ~(mask << shift); /* Clear bits */
*regval |= (newval & mask) << shift; /* Set new value */
*muteval &= mutemask;
*muteval |= mute;
}
static int ad1848_mixer_get(ad1848_info * devc, int dev)
{
if (!((1 << dev) & devc->supported_devices))
return -EINVAL;
dev = devc->mixer_reroute[dev];
return devc->levels[dev];
}
static void ad1848_mixer_set_channel(ad1848_info *devc, int dev, int value, int channel)
{
int regoffs, muteregoffs;
unsigned char val, muteval;
unsigned long flags;
regoffs = devc->mix_devices[dev][channel].regno;
muteregoffs = devc->mix_devices[dev][channel].mutereg;
val = ad_read(devc, regoffs);
if (muteregoffs != regoffs) {
muteval = ad_read(devc, muteregoffs);
change_bits(devc, &val, &muteval, dev, channel, value);
}
else
change_bits(devc, &val, &val, dev, channel, value);
spin_lock_irqsave(&devc->lock,flags);
ad_write(devc, regoffs, val);
devc->saved_regs[regoffs] = val;
if (muteregoffs != regoffs) {
ad_write(devc, muteregoffs, muteval);
devc->saved_regs[muteregoffs] = muteval;
}
spin_unlock_irqrestore(&devc->lock,flags);
}
static int ad1848_mixer_set(ad1848_info * devc, int dev, int value)
{
int left = value & 0x000000ff;
int right = (value & 0x0000ff00) >> 8;
int retvol;
if (dev > 31)
return -EINVAL;
if (!(devc->supported_devices & (1 << dev)))
return -EINVAL;
dev = devc->mixer_reroute[dev];
if (devc->mix_devices[dev][LEFT_CHN].nbits == 0)
return -EINVAL;
if (left > 100)
left = 100;
if (right > 100)
right = 100;
if (devc->mix_devices[dev][RIGHT_CHN].nbits == 0) /* Mono control */
right = left;
retvol = left | (right << 8);
/* Scale volumes */
left = mix_cvt[left];
right = mix_cvt[right];
devc->levels[dev] = retvol;
/*
* Set the left channel
*/
ad1848_mixer_set_channel(devc, dev, left, LEFT_CHN);
/*
* Set the right channel
*/
if (devc->mix_devices[dev][RIGHT_CHN].nbits == 0)
goto out;
ad1848_mixer_set_channel(devc, dev, right, RIGHT_CHN);
out:
return retvol;
}
static void ad1848_mixer_reset(ad1848_info * devc)
{
int i;
char name[32];
unsigned long flags;
devc->mix_devices = &(ad1848_mix_devices[0]);
sprintf(name, "%s_%d", devc->chip_name, nr_ad1848_devs);
for (i = 0; i < 32; i++)
devc->mixer_reroute[i] = i;
devc->supported_rec_devices = MODE1_REC_DEVICES;
switch (devc->model)
{
case MD_4231:
case MD_4231A:
case MD_1845:
case MD_1845_SSCAPE:
devc->supported_devices = MODE2_MIXER_DEVICES;
break;
case MD_C930:
devc->supported_devices = C930_MIXER_DEVICES;
devc->mix_devices = &(c930_mix_devices[0]);
break;
case MD_IWAVE:
devc->supported_devices = MODE3_MIXER_DEVICES;
devc->mix_devices = &(iwave_mix_devices[0]);
break;
case MD_42xB:
case MD_4239:
devc->mix_devices = &(cs42xb_mix_devices[0]);
devc->supported_devices = MODE3_MIXER_DEVICES;
break;
case MD_4232:
case MD_4235:
case MD_4236:
devc->supported_devices = MODE3_MIXER_DEVICES;
break;
case MD_1848:
if (soundpro) {
devc->supported_devices = SPRO_MIXER_DEVICES;
devc->supported_rec_devices = SPRO_REC_DEVICES;
devc->mix_devices = &(spro_mix_devices[0]);
break;
}
default:
devc->supported_devices = MODE1_MIXER_DEVICES;
}
devc->orig_devices = devc->supported_devices;
devc->orig_rec_devices = devc->supported_rec_devices;
devc->levels = load_mixer_volumes(name, default_mixer_levels, 1);
for (i = 0; i < SOUND_MIXER_NRDEVICES; i++)
{
if (devc->supported_devices & (1 << i))
ad1848_mixer_set(devc, i, devc->levels[i]);
}
ad1848_set_recmask(devc, SOUND_MASK_MIC);
devc->mixer_output_port = devc->levels[31] | AUDIO_HEADPHONE | AUDIO_LINE_OUT;
spin_lock_irqsave(&devc->lock,flags);
if (!soundpro) {
if (devc->mixer_output_port & AUDIO_SPEAKER)
ad_write(devc, 26, ad_read(devc, 26) & ~0x40); /* Unmute mono out */
else
ad_write(devc, 26, ad_read(devc, 26) | 0x40); /* Mute mono out */
} else {
/*
* From the "wouldn't it be nice if the mixer API had (better)
* support for custom stuff" category
*/
/* Enable surround mode and SB16 mixer */
ad_write(devc, 16, 0x60);
}
spin_unlock_irqrestore(&devc->lock,flags);
}
static int ad1848_mixer_ioctl(int dev, unsigned int cmd, void __user *arg)
{
ad1848_info *devc = mixer_devs[dev]->devc;
int val;
if (cmd == SOUND_MIXER_PRIVATE1)
{
if (get_user(val, (int __user *)arg))
return -EFAULT;
if (val != 0xffff)
{
unsigned long flags;
val &= (AUDIO_SPEAKER | AUDIO_HEADPHONE | AUDIO_LINE_OUT);
devc->mixer_output_port = val;
val |= AUDIO_HEADPHONE | AUDIO_LINE_OUT; /* Always on */
devc->mixer_output_port = val;
spin_lock_irqsave(&devc->lock,flags);
if (val & AUDIO_SPEAKER)
ad_write(devc, 26, ad_read(devc, 26) & ~0x40); /* Unmute mono out */
else
ad_write(devc, 26, ad_read(devc, 26) | 0x40); /* Mute mono out */
spin_unlock_irqrestore(&devc->lock,flags);
}
val = devc->mixer_output_port;
return put_user(val, (int __user *)arg);
}
if (cmd == SOUND_MIXER_PRIVATE2)
{
if (get_user(val, (int __user *)arg))
return -EFAULT;
return(ad1848_control(AD1848_MIXER_REROUTE, val));
}
if (((cmd >> 8) & 0xff) == 'M')
{
if (_SIOC_DIR(cmd) & _SIOC_WRITE)
{
switch (cmd & 0xff)
{
case SOUND_MIXER_RECSRC:
if (get_user(val, (int __user *)arg))
return -EFAULT;
val = ad1848_set_recmask(devc, val);
break;
default:
if (get_user(val, (int __user *)arg))
return -EFAULT;
val = ad1848_mixer_set(devc, cmd & 0xff, val);
break;
}
return put_user(val, (int __user *)arg);
}
else
{
switch (cmd & 0xff)
{
/*
* Return parameters
*/
case SOUND_MIXER_RECSRC:
val = devc->recmask;
break;
case SOUND_MIXER_DEVMASK:
val = devc->supported_devices;
break;
case SOUND_MIXER_STEREODEVS:
val = devc->supported_devices;
if (devc->model != MD_C930)
val &= ~(SOUND_MASK_SPEAKER | SOUND_MASK_IMIX);
break;
case SOUND_MIXER_RECMASK:
val = devc->supported_rec_devices;
break;
case SOUND_MIXER_CAPS:
val=SOUND_CAP_EXCL_INPUT;
break;
default:
val = ad1848_mixer_get(devc, cmd & 0xff);
break;
}
return put_user(val, (int __user *)arg);
}
}
else
return -EINVAL;
}
static int ad1848_set_speed(int dev, int arg)
{
ad1848_info *devc = (ad1848_info *) audio_devs[dev]->devc;
ad1848_port_info *portc = (ad1848_port_info *) audio_devs[dev]->portc;
/*
* The sampling speed is encoded in the least significant nibble of I8. The
* LSB selects the clock source (0=24.576 MHz, 1=16.9344 MHz) and other
* three bits select the divisor (indirectly):
*
* The available speeds are in the following table. Keep the speeds in
* the increasing order.
*/
typedef struct
{
int speed;
unsigned char bits;
}
speed_struct;
static speed_struct speed_table[] =
{
{5510, (0 << 1) | 1},
{5510, (0 << 1) | 1},
{6620, (7 << 1) | 1},
{8000, (0 << 1) | 0},
{9600, (7 << 1) | 0},
{11025, (1 << 1) | 1},
{16000, (1 << 1) | 0},
{18900, (2 << 1) | 1},
{22050, (3 << 1) | 1},
{27420, (2 << 1) | 0},
{32000, (3 << 1) | 0},
{33075, (6 << 1) | 1},
{37800, (4 << 1) | 1},
{44100, (5 << 1) | 1},
{48000, (6 << 1) | 0}
};
int i, n, selected = -1;
n = sizeof(speed_table) / sizeof(speed_struct);
if (arg <= 0)
return portc->speed;
if (devc->model == MD_1845 || devc->model == MD_1845_SSCAPE) /* AD1845 has different timer than others */
{
if (arg < 4000)
arg = 4000;
if (arg > 50000)
arg = 50000;
portc->speed = arg;
portc->speed_bits = speed_table[3].bits;
return portc->speed;
}
if (arg < speed_table[0].speed)
selected = 0;
if (arg > speed_table[n - 1].speed)
selected = n - 1;
for (i = 1 /*really */ ; selected == -1 && i < n; i++)
{
if (speed_table[i].speed == arg)
selected = i;
else if (speed_table[i].speed > arg)
{
int diff1, diff2;
diff1 = arg - speed_table[i - 1].speed;
diff2 = speed_table[i].speed - arg;
if (diff1 < diff2)
selected = i - 1;
else
selected = i;
}
}
if (selected == -1)
{
printk(KERN_WARNING "ad1848: Can't find speed???\n");
selected = 3;
}
portc->speed = speed_table[selected].speed;
portc->speed_bits = speed_table[selected].bits;
return portc->speed;
}
static short ad1848_set_channels(int dev, short arg)
{
ad1848_port_info *portc = (ad1848_port_info *) audio_devs[dev]->portc;
if (arg != 1 && arg != 2)
return portc->channels;
portc->channels = arg;
return arg;
}
static unsigned int ad1848_set_bits(int dev, unsigned int arg)
{
ad1848_info *devc = (ad1848_info *) audio_devs[dev]->devc;
ad1848_port_info *portc = (ad1848_port_info *) audio_devs[dev]->portc;
static struct format_tbl
{
int format;
unsigned char bits;
}
format2bits[] =
{
{
0, 0
}
,
{
AFMT_MU_LAW, 1
}
,
{
AFMT_A_LAW, 3
}
,
{
AFMT_IMA_ADPCM, 5
}
,
{
AFMT_U8, 0
}
,
{
AFMT_S16_LE, 2
}
,
{
AFMT_S16_BE, 6
}
,
{
AFMT_S8, 0
}
,
{
AFMT_U16_LE, 0
}
,
{
AFMT_U16_BE, 0
}
};
int i, n = sizeof(format2bits) / sizeof(struct format_tbl);
if (arg == 0)
return portc->audio_format;
if (!(arg & ad_format_mask[devc->model]))
arg = AFMT_U8;
portc->audio_format = arg;
for (i = 0; i < n; i++)
if (format2bits[i].format == arg)
{
if ((portc->format_bits = format2bits[i].bits) == 0)
return portc->audio_format = AFMT_U8; /* Was not supported */
return arg;
}
/* Still hanging here. Something must be terribly wrong */
portc->format_bits = 0;
return portc->audio_format = AFMT_U8;
}
static struct audio_driver ad1848_audio_driver =
{
.owner = THIS_MODULE,
.open = ad1848_open,
.close = ad1848_close,
.output_block = ad1848_output_block,
.start_input = ad1848_start_input,
.prepare_for_input = ad1848_prepare_for_input,
.prepare_for_output = ad1848_prepare_for_output,
.halt_io = ad1848_halt,
.halt_input = ad1848_halt_input,
.halt_output = ad1848_halt_output,
.trigger = ad1848_trigger,
.set_speed = ad1848_set_speed,
.set_bits = ad1848_set_bits,
.set_channels = ad1848_set_channels
};
static struct mixer_operations ad1848_mixer_operations =
{
.owner = THIS_MODULE,
.id = "SOUNDPORT",
.name = "AD1848/CS4248/CS4231",
.ioctl = ad1848_mixer_ioctl
};
static int ad1848_open(int dev, int mode)
{
ad1848_info *devc;
ad1848_port_info *portc;
unsigned long flags;
if (dev < 0 || dev >= num_audiodevs)
return -ENXIO;
devc = (ad1848_info *) audio_devs[dev]->devc;
portc = (ad1848_port_info *) audio_devs[dev]->portc;
/* here we don't have to protect against intr */
spin_lock(&devc->lock);
if (portc->open_mode || (devc->open_mode & mode))
{
spin_unlock(&devc->lock);
return -EBUSY;
}
devc->dual_dma = 0;
if (audio_devs[dev]->flags & DMA_DUPLEX)
{
devc->dual_dma = 1;
}
devc->intr_active = 0;
devc->audio_mode = 0;
devc->open_mode |= mode;
portc->open_mode = mode;
spin_unlock(&devc->lock);
ad1848_trigger(dev, 0);
if (mode & OPEN_READ)
devc->record_dev = dev;
if (mode & OPEN_WRITE)