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dmasound_core.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:51k
源码类别:
Linux/Unix编程
开发平台:
Unix_Linux
- /*
- * linux/drivers/sound/dmasound/dmasound_core.c
- *
- *
- * OSS/Free compatible Atari TT/Falcon and Amiga DMA sound driver for
- * Linux/m68k
- * Extended to support Power Macintosh for Linux/ppc by Paul Mackerras
- *
- * (c) 1995 by Michael Schlueter & Michael Marte
- *
- * Michael Schlueter (michael@duck.syd.de) did the basic structure of the VFS
- * interface and the u-law to signed byte conversion.
- *
- * Michael Marte (marte@informatik.uni-muenchen.de) did the sound queue,
- * /dev/mixer, /dev/sndstat and complemented the VFS interface. He would like
- * to thank:
- * - Michael Schlueter for initial ideas and documentation on the MFP and
- * the DMA sound hardware.
- * - Therapy? for their CD 'Troublegum' which really made me rock.
- *
- * /dev/sndstat is based on code by Hannu Savolainen, the author of the
- * VoxWare family of drivers.
- *
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file COPYING in the main directory of this archive
- * for more details.
- *
- * History:
- *
- * 1995/8/25 First release
- *
- * 1995/9/02 Roman Hodek:
- * - Fixed atari_stram_alloc() call, the timer
- * programming and several race conditions
- * 1995/9/14 Roman Hodek:
- * - After some discussion with Michael Schlueter,
- * revised the interrupt disabling
- * - Slightly speeded up U8->S8 translation by using
- * long operations where possible
- * - Added 4:3 interpolation for /dev/audio
- *
- * 1995/9/20 Torsten Scherer:
- * - Fixed a bug in sq_write and changed /dev/audio
- * converting to play at 12517Hz instead of 6258Hz.
- *
- * 1995/9/23 Torsten Scherer:
- * - Changed sq_interrupt() and sq_play() to pre-program
- * the DMA for another frame while there's still one
- * running. This allows the IRQ response to be
- * arbitrarily delayed and playing will still continue.
- *
- * 1995/10/14 Guenther Kelleter, Torsten Scherer:
- * - Better support for Falcon audio (the Falcon doesn't
- * raise an IRQ at the end of a frame, but at the
- * beginning instead!). uses 'if (codec_dma)' in lots
- * of places to simply switch between Falcon and TT
- * code.
- *
- * 1995/11/06 Torsten Scherer:
- * - Started introducing a hardware abstraction scheme
- * (may perhaps also serve for Amigas?)
- * - Can now play samples at almost all frequencies by
- * means of a more generalized expand routine
- * - Takes a good deal of care to cut data only at
- * sample sizes
- * - Buffer size is now a kernel runtime option
- * - Implemented fsync() & several minor improvements
- * Guenther Kelleter:
- * - Useful hints and bug fixes
- * - Cross-checked it for Falcons
- *
- * 1996/3/9 Geert Uytterhoeven:
- * - Support added for Amiga, A-law, 16-bit little
- * endian.
- * - Unification to drivers/sound/dmasound.c.
- *
- * 1996/4/6 Martin Mitchell:
- * - Updated to 1.3 kernel.
- *
- * 1996/6/13 Topi Kanerva:
- * - Fixed things that were broken (mainly the amiga
- * 14-bit routines)
- * - /dev/sndstat shows now the real hardware frequency
- * - The lowpass filter is disabled by default now
- *
- * 1996/9/25 Geert Uytterhoeven:
- * - Modularization
- *
- * 1998/6/10 Andreas Schwab:
- * - Converted to use sound_core
- *
- * 1999/12/28 Richard Zidlicky:
- * - Added support for Q40
- *
- * 2000/2/27 Geert Uytterhoeven:
- * - Clean up and split the code into 4 parts:
- * o dmasound_core: machine-independent code
- * o dmasound_atari: Atari TT and Falcon support
- * o dmasound_awacs: Apple PowerMac support
- * o dmasound_paula: Amiga support
- *
- * 2000/3/25 Geert Uytterhoeven:
- * - Integration of dmasound_q40
- * - Small clean ups
- *
- * 2001/01/26 [1.0] Iain Sandoe
- * - make /dev/sndstat show revision & edition info.
- * - since dmasound.mach.sq_setup() can fail on pmac
- * its type has been changed to int and the returns
- * are checked.
- * [1.1] - stop missing translations from being called.
- * 2001/02/08 [1.2] - remove unused translation tables & move machine-
- * specific tables to low-level.
- * - return correct info. for SNDCTL_DSP_GETFMTS.
- * [1.3] - implement SNDCTL_DSP_GETCAPS fully.
- * [1.4] - make /dev/sndstat text length usage deterministic.
- * - make /dev/sndstat call to low-level
- * dmasound.mach.state_info() pass max space to ll driver.
- * - tidy startup banners and output info.
- * [1.5] - tidy up a little (removed some unused #defines in
- * dmasound.h)
- * - fix up HAS_RECORD conditionalisation.
- * - add record code in places it is missing...
- * - change buf-sizes to bytes to allow < 1kb for pmac
- * if user param entry is < 256 the value is taken to
- * be in kb > 256 is taken to be in bytes.
- * - make default buff/frag params conditional on
- * machine to allow smaller values for pmac.
- * - made the ioctls, read & write comply with the OSS
- * rules on setting params.
- * - added parsing of _setup() params for record.
- * 2001/04/04 [1.6] - fix bug where sample rates higher than maximum were
- * being reported as OK.
- * - fix open() to return -EBUSY as per OSS doc. when
- * audio is in use - this is independent of O_NOBLOCK.
- * - fix bug where SNDCTL_DSP_POST was blocking.
- */
- /* Record capability notes 30/01/2001:
- * At present these observations apply only to pmac LL driver (the only one
- * that can do record, at present). However, if other LL drivers for machines
- * with record are added they may apply.
- *
- * The fragment parameters for the record and play channels are separate.
- * However, if the driver is opened O_RDWR there is no way (in the current OSS
- * API) to specify their values independently for the record and playback
- * channels. Since the only common factor between the input & output is the
- * sample rate (on pmac) it should be possible to open /dev/dspX O_WRONLY and
- * /dev/dspY O_RDONLY. The input & output channels could then have different
- * characteristics (other than the first that sets sample rate claiming the
- * right to set it for ever). As it stands, the format, channels, number of
- * bits & sample rate are assumed to be common. In the future perhaps these
- * should be the responsibility of the LL driver - and then if a card really
- * does not share items between record & playback they can be specified
- * separately.
- */
- /* Thread-safeness of shared_resources notes: 31/01/2001
- * If the user opens O_RDWR and then splits record & play between two threads
- * both of which inherit the fd - and then starts changing things from both
- * - we will have difficulty telling.
- *
- * It's bad application coding - but ...
- * TODO: think about how to sort this out... without bogging everything down in
- * semaphores.
- *
- * Similarly, the OSS spec says "all changes to parameters must be between
- * open() and the first read() or write(). - and a bit later on (by
- * implication) "between SNDCTL_DSP_RESET and the first read() or write() after
- * it". If the app is multi-threaded and this rule is broken between threads
- * we will have trouble spotting it - and the fault will be rather obscure :-(
- *
- * We will try and put out at least a kmsg if we see it happen... but I think
- * it will be quite hard to trap it with an -EXXX return... because we can't
- * see the fault until after the damage is done.
- */
- #include <linux/module.h>
- #include <linux/slab.h>
- #include <linux/sound.h>
- #include <linux/init.h>
- #include <linux/soundcard.h>
- #include <linux/poll.h>
- #include <linux/smp_lock.h>
- #include <asm/uaccess.h>
- #include "dmasound.h"
- #define DMASOUND_CORE_REVISION 1
- #define DMASOUND_CORE_EDITION 6
- /*
- * Declarations
- */
- int dmasound_catchRadius = 0;
- MODULE_PARM(dmasound_catchRadius, "i");
- static unsigned int numWriteBufs = DEFAULT_N_BUFFERS;
- MODULE_PARM(numWriteBufs, "i");
- static unsigned int writeBufSize = DEFAULT_BUFF_SIZE ; /* in bytes */
- MODULE_PARM(writeBufSize, "i");
- #ifdef HAS_RECORD
- static unsigned int numReadBufs = DEFAULT_N_BUFFERS;
- MODULE_PARM(numReadBufs, "i");
- static unsigned int readBufSize = DEFAULT_BUFF_SIZE; /* in bytes */
- MODULE_PARM(readBufSize, "i");
- #endif
- MODULE_LICENSE("GPL");
- #ifdef MODULE
- static int sq_unit = -1;
- static int mixer_unit = -1;
- static int state_unit = -1;
- static int irq_installed = 0;
- #endif /* MODULE */
- /* control over who can modify resources shared between play/record */
- static mode_t shared_resource_owner = 0 ;
- static int shared_resources_initialised = 0 ;
- /*
- * Mid level stuff
- */
- struct sound_settings dmasound;
- static inline void sound_silence(void)
- {
- dmasound.mach.silence(); /* _MUST_ stop DMA */
- }
- static inline int sound_set_format(int format)
- {
- return dmasound.mach.setFormat(format);
- }
- static int sound_set_speed(int speed)
- {
- if (speed < 0)
- return dmasound.soft.speed;
- /* trap out-of-range speed settings.
- at present we allow (arbitrarily) low rates - using soft
- up-conversion - but we can't allow > max because there is
- no soft down-conversion.
- */
- if (dmasound.mach.max_dsp_speed &&
- (speed > dmasound.mach.max_dsp_speed))
- speed = dmasound.mach.max_dsp_speed ;
- dmasound.soft.speed = speed;
- if (dmasound.minDev == SND_DEV_DSP)
- dmasound.dsp.speed = dmasound.soft.speed;
- return dmasound.soft.speed;
- }
- static int sound_set_stereo(int stereo)
- {
- if (stereo < 0)
- return dmasound.soft.stereo;
- stereo = !!stereo; /* should be 0 or 1 now */
- dmasound.soft.stereo = stereo;
- if (dmasound.minDev == SND_DEV_DSP)
- dmasound.dsp.stereo = stereo;
- return stereo;
- }
- static ssize_t sound_copy_translate(TRANS *trans, const u_char *userPtr,
- size_t userCount, u_char frame[],
- ssize_t *frameUsed, ssize_t frameLeft)
- {
- ssize_t (*ct_func)(const u_char *, size_t, u_char *, ssize_t *, ssize_t);
- switch (dmasound.soft.format) {
- case AFMT_MU_LAW:
- ct_func = trans->ct_ulaw;
- break;
- case AFMT_A_LAW:
- ct_func = trans->ct_alaw;
- break;
- case AFMT_S8:
- ct_func = trans->ct_s8;
- break;
- case AFMT_U8:
- ct_func = trans->ct_u8;
- break;
- case AFMT_S16_BE:
- ct_func = trans->ct_s16be;
- break;
- case AFMT_U16_BE:
- ct_func = trans->ct_u16be;
- break;
- case AFMT_S16_LE:
- ct_func = trans->ct_s16le;
- break;
- case AFMT_U16_LE:
- ct_func = trans->ct_u16le;
- break;
- default:
- return 0;
- }
- /* if the user has requested a non-existent translation don't try
- to call it but just return 0 bytes moved
- */
- if (ct_func)
- return ct_func(userPtr, userCount, frame, frameUsed, frameLeft);
- return 0;
- }
- /*
- * /dev/mixer abstraction
- */
- static struct {
- int busy;
- int modify_counter;
- } mixer;
- static int mixer_open(struct inode *inode, struct file *file)
- {
- dmasound.mach.open();
- mixer.busy = 1;
- return 0;
- }
- static int mixer_release(struct inode *inode, struct file *file)
- {
- lock_kernel();
- mixer.busy = 0;
- dmasound.mach.release();
- unlock_kernel();
- return 0;
- }
- static int mixer_ioctl(struct inode *inode, struct file *file, u_int cmd,
- u_long arg)
- {
- if (_SIOC_DIR(cmd) & _SIOC_WRITE)
- mixer.modify_counter++;
- switch (cmd) {
- case OSS_GETVERSION:
- return IOCTL_OUT(arg, SOUND_VERSION);
- case SOUND_MIXER_INFO:
- {
- mixer_info info;
- strncpy(info.id, dmasound.mach.name2, sizeof(info.id));
- strncpy(info.name, dmasound.mach.name2, sizeof(info.name));
- info.name[sizeof(info.name)-1] = 0;
- info.modify_counter = mixer.modify_counter;
- if (copy_to_user((int *)arg, &info, sizeof(info)))
- return -EFAULT;
- return 0;
- }
- }
- if (dmasound.mach.mixer_ioctl)
- return dmasound.mach.mixer_ioctl(cmd, arg);
- return -EINVAL;
- }
- static struct file_operations mixer_fops =
- {
- owner: THIS_MODULE,
- llseek: no_llseek,
- ioctl: mixer_ioctl,
- open: mixer_open,
- release: mixer_release,
- };
- static void __init mixer_init(void)
- {
- #ifndef MODULE
- int mixer_unit;
- #endif
- mixer_unit = register_sound_mixer(&mixer_fops, -1);
- if (mixer_unit < 0)
- return;
- mixer.busy = 0;
- dmasound.treble = 0;
- dmasound.bass = 0;
- if (dmasound.mach.mixer_init)
- dmasound.mach.mixer_init();
- }
- /*
- * Sound queue stuff, the heart of the driver
- */
- struct sound_queue dmasound_write_sq;
- static void sq_reset_output(void) ;
- #ifdef HAS_RECORD
- struct sound_queue dmasound_read_sq;
- static void sq_reset_input(void) ;
- #endif
- static int sq_allocate_buffers(struct sound_queue *sq, int num, int size)
- {
- int i;
- if (sq->buffers)
- return 0;
- sq->numBufs = num;
- sq->bufSize = size;
- sq->buffers = kmalloc (num * sizeof(char *), GFP_KERNEL);
- if (!sq->buffers)
- return -ENOMEM;
- for (i = 0; i < num; i++) {
- sq->buffers[i] = dmasound.mach.dma_alloc(size, GFP_KERNEL);
- if (!sq->buffers[i]) {
- while (i--)
- dmasound.mach.dma_free(sq->buffers[i], size);
- kfree(sq->buffers);
- sq->buffers = 0;
- return -ENOMEM;
- }
- }
- return 0;
- }
- static void sq_release_buffers(struct sound_queue *sq)
- {
- int i;
- if (sq->buffers) {
- for (i = 0; i < sq->numBufs; i++)
- dmasound.mach.dma_free(sq->buffers[i], sq->bufSize);
- kfree(sq->buffers);
- sq->buffers = NULL;
- }
- }
- static int sq_setup(struct sound_queue *sq)
- {
- int (*setup_func)(void) = 0;
- int hard_frame ;
- if (sq->locked) { /* are we already set? - and not changeable */
- #ifdef DEBUG_DMASOUND
- printk("dmasound_core: tried to sq_setup a locked queuen") ;
- #endif
- return -EINVAL ;
- }
- sq->locked = 1 ; /* don't think we have a race prob. here _check_ */
- /* make sure that the parameters are set up
- This should have been done already...
- */
- dmasound.mach.init();
- /* OK. If the user has set fragment parameters explicitly, then we
- should leave them alone... as long as they are valid.
- Invalid user fragment params can occur if we allow the whole buffer
- to be used when the user requests the fragments sizes (with no soft
- x-lation) and then the user subsequently sets a soft x-lation that
- requires increased internal buffering.
- Othwerwise (if the user did not set them) OSS says that we should
- select frag params on the basis of 0.5 s output & 0.1 s input
- latency. (TODO. For now we will copy in the defaults.)
- */
- if (sq->user_frags <= 0) {
- sq->max_count = sq->numBufs ;
- sq->max_active = sq->numBufs ;
- sq->block_size = sq->bufSize;
- /* set up the user info */
- sq->user_frags = sq->numBufs ;
- sq->user_frag_size = sq->bufSize ;
- sq->user_frag_size *=
- (dmasound.soft.size * (dmasound.soft.stereo+1) ) ;
- sq->user_frag_size /=
- (dmasound.hard.size * (dmasound.hard.stereo+1) ) ;
- } else {
- /* work out requested block size */
- sq->block_size = sq->user_frag_size ;
- sq->block_size *=
- (dmasound.hard.size * (dmasound.hard.stereo+1) ) ;
- sq->block_size /=
- (dmasound.soft.size * (dmasound.soft.stereo+1) ) ;
- /* the user wants to write frag-size chunks */
- sq->block_size *= dmasound.hard.speed ;
- sq->block_size /= dmasound.soft.speed ;
- /* this only works for size values which are powers of 2 */
- hard_frame =
- (dmasound.hard.size * (dmasound.hard.stereo+1))/8 ;
- sq->block_size += (hard_frame - 1) ;
- sq->block_size &= ~(hard_frame - 1) ; /* make sure we are aligned */
- /* let's just check for obvious mistakes */
- if ( sq->block_size <= 0 || sq->block_size > sq->bufSize) {
- #ifdef DEBUG_DMASOUND
- printk("dmasound_core: invalid frag size (user set %d)n", sq->user_frag_size) ;
- #endif
- sq->block_size = sq->bufSize ;
- }
- if ( sq->user_frags <= sq->numBufs ) {
- sq->max_count = sq->user_frags ;
- /* if user has set max_active - then use it */
- sq->max_active = (sq->max_active <= sq->max_count) ?
- sq->max_active : sq->max_count ;
- } else {
- #ifdef DEBUG_DMASOUND
- printk("dmasound_core: invalid frag count (user set %d)n", sq->user_frags) ;
- #endif
- sq->max_count =
- sq->max_active = sq->numBufs ;
- }
- }
- sq->front = sq->count = sq->rear_size = 0;
- sq->syncing = 0;
- sq->active = 0;
- if (sq == &write_sq) {
- sq->rear = -1;
- setup_func = dmasound.mach.write_sq_setup;
- }
- #ifdef HAS_RECORD
- else {
- sq->rear = 0;
- setup_func = dmasound.mach.read_sq_setup;
- }
- #endif
- if (setup_func)
- return setup_func();
- return 0 ;
- }
- static inline void sq_play(void)
- {
- dmasound.mach.play();
- }
- static ssize_t sq_write(struct file *file, const char *src, size_t uLeft,
- loff_t *ppos)
- {
- ssize_t uWritten = 0;
- u_char *dest;
- ssize_t uUsed = 0, bUsed, bLeft;
- unsigned long flags ;
- /* ++TeSche: Is something like this necessary?
- * Hey, that's an honest question! Or does any other part of the
- * filesystem already checks this situation? I really don't know.
- */
- if (uLeft == 0)
- return 0;
- /* implement any changes we have made to the soft/hard params.
- this is not satisfactory really, all we have done up to now is to
- say what we would like - there hasn't been any real checking of capability
- */
- if (shared_resources_initialised == 0) {
- dmasound.mach.init() ;
- shared_resources_initialised = 1 ;
- }
- /* set up the sq if it is not already done. This may seem a dumb place
- to do it - but it is what OSS requires. It means that write() can
- return memory allocation errors. To avoid this possibility use the
- GETBLKSIZE or GETOSPACE ioctls (after you've fiddled with all the
- params you want to change) - these ioctls also force the setup.
- */
- if (write_sq.locked == 0) {
- if ((uWritten = sq_setup(&write_sq)) < 0) return uWritten ;
- uWritten = 0 ;
- }
- /* FIXME: I think that this may be the wrong behaviour when we get strapped
- for time and the cpu is close to being (or actually) behind in sending data.
- - because we've lost the time that the N samples, already in the buffer,
- would have given us to get here with the next lot from the user.
- */
- /* The interrupt doesn't start to play the last, incomplete frame.
- * Thus we can append to it without disabling the interrupts! (Note
- * also that write_sq.rear isn't affected by the interrupt.)
- */
- /* as of 1.6 this behaviour changes if SNDCTL_DSP_POST has been issued:
- this will mimic the behaviour of syncing and allow the sq_play() to
- queue a partial fragment. Since sq_play() may/will be called from
- the IRQ handler - at least on Pmac we have to deal with it.
- The strategy - possibly not optimum - is to kill _POST status if we
- get here. This seems, at least, reasonable - in the sense that POST
- is supposed to indicate that we might not write before the queue
- is drained - and if we get here in time then it does not apply.
- */
- save_flags(flags) ; cli() ;
- write_sq.syncing &= ~2 ; /* take out POST status */
- restore_flags(flags) ;
- if (write_sq.count > 0 &&
- (bLeft = write_sq.block_size-write_sq.rear_size) > 0) {
- dest = write_sq.buffers[write_sq.rear];
- bUsed = write_sq.rear_size;
- uUsed = sound_copy_translate(dmasound.trans_write, src, uLeft,
- dest, &bUsed, bLeft);
- if (uUsed <= 0)
- return uUsed;
- src += uUsed;
- uWritten += uUsed;
- uLeft = (uUsed <= uLeft) ? (uLeft - uUsed) : 0 ; /* paranoia */
- write_sq.rear_size = bUsed;
- }
- while (uLeft) {
- while (write_sq.count >= write_sq.max_active) {
- sq_play();
- if (write_sq.open_mode & O_NONBLOCK)
- return uWritten > 0 ? uWritten : -EAGAIN;
- SLEEP(write_sq.action_queue);
- if (signal_pending(current))
- return uWritten > 0 ? uWritten : -EINTR;
- }
- /* Here, we can avoid disabling the interrupt by first
- * copying and translating the data, and then updating
- * the write_sq variables. Until this is done, the interrupt
- * won't see the new frame and we can work on it
- * undisturbed.
- */
- dest = write_sq.buffers[(write_sq.rear+1) % write_sq.max_count];
- bUsed = 0;
- bLeft = write_sq.block_size;
- uUsed = sound_copy_translate(dmasound.trans_write, src, uLeft,
- dest, &bUsed, bLeft);
- if (uUsed <= 0)
- break;
- src += uUsed;
- uWritten += uUsed;
- uLeft = (uUsed <= uLeft) ? (uLeft - uUsed) : 0 ; /* paranoia */
- if (bUsed) {
- write_sq.rear = (write_sq.rear+1) % write_sq.max_count;
- write_sq.rear_size = bUsed;
- write_sq.count++;
- }
- } /* uUsed may have been 0 */
- sq_play();
- return uUsed < 0? uUsed: uWritten;
- }
- static unsigned int sq_poll(struct file *file, struct poll_table_struct *wait)
- {
- unsigned int mask = 0;
- int retVal;
- if (write_sq.locked == 0) {
- if ((retVal = sq_setup(&write_sq)) < 0)
- return retVal;
- return 0;
- }
- if (file->f_mode & FMODE_WRITE )
- poll_wait(file, &write_sq.action_queue, wait);
- #ifdef HAS_RECORD
- if (file->f_mode & FMODE_READ)
- poll_wait(file, &read_sq.action_queue, wait);
- if (file->f_mode & FMODE_READ)
- if (read_sq.block_size - read_sq.rear_size > 0)
- mask |= POLLIN | POLLRDNORM;
- #endif
- if (file->f_mode & FMODE_WRITE)
- if (write_sq.count < write_sq.max_active || write_sq.block_size - write_sq.rear_size > 0)
- mask |= POLLOUT | POLLWRNORM;
- return mask;
- }
- #ifdef HAS_RECORD
- /*
- * Here is how the values are used for reading.
- * The value 'active' simply indicates the DMA is running. This is done
- * so the driver semantics are DMA starts when the first read is posted.
- * The value 'front' indicates the buffer we should next send to the user.
- * The value 'rear' indicates the buffer the DMA is currently filling.
- * When 'front' == 'rear' the buffer "ring" is empty (we always have an
- * empty available). The 'rear_size' is used to track partial offsets
- * into the buffer we are currently returning to the user.
- * This level (> [1.5]) doesn't care what strategy the LL driver uses with
- * DMA on over-run. It can leave it running (and keep active == 1) or it
- * can kill it and set active == 0 in which case this routine will spot
- * it and restart the DMA.
- */
- static ssize_t sq_read(struct file *file, char *dst, size_t uLeft,
- loff_t *ppos)
- {
- ssize_t uRead, bLeft, bUsed, uUsed;
- if (uLeft == 0)
- return 0;
- /* cater for the compatibility mode - record compiled in but no LL */
- if (dmasound.mach.record == NULL)
- return -EINVAL ;
- /* see comment in sq_write()
- */
- if( shared_resources_initialised == 0) {
- dmasound.mach.init() ;
- shared_resources_initialised = 1 ;
- }
- /* set up the sq if it is not already done. see comments in sq_write().
- */
- if (read_sq.locked == 0) {
- if ((uRead = sq_setup(&read_sq)) < 0)
- return uRead ;
- }
- uRead = 0;
- /* Move what the user requests, depending upon other options.
- */
- while (uLeft > 0) {
- /* we happened to get behind and the LL driver killed DMA
- then we should set it going again. This also sets it
- going the first time through.
- */
- if ( !read_sq.active )
- dmasound.mach.record();
- /* When front == rear, the DMA is not done yet.
- */
- while (read_sq.front == read_sq.rear) {
- if (read_sq.open_mode & O_NONBLOCK) {
- return uRead > 0 ? uRead : -EAGAIN;
- }
- SLEEP(read_sq.action_queue);
- if (signal_pending(current))
- return uRead > 0 ? uRead : -EINTR;
- }
- /* The amount we move is either what is left in the
- * current buffer or what the user wants.
- */
- bLeft = read_sq.block_size - read_sq.rear_size;
- bUsed = read_sq.rear_size;
- uUsed = sound_copy_translate(dmasound.trans_read, dst, uLeft,
- read_sq.buffers[read_sq.front],
- &bUsed, bLeft);
- if (uUsed <= 0)
- return uUsed;
- dst += uUsed;
- uRead += uUsed;
- uLeft -= uUsed;
- read_sq.rear_size += bUsed;
- if (read_sq.rear_size >= read_sq.block_size) {
- read_sq.rear_size = 0;
- read_sq.front++;
- if (read_sq.front >= read_sq.max_active)
- read_sq.front = 0;
- }
- }
- return uRead;
- }
- #endif /* HAS_RECORD */
- static inline void sq_init_waitqueue(struct sound_queue *sq)
- {
- init_waitqueue_head(&sq->action_queue);
- init_waitqueue_head(&sq->open_queue);
- init_waitqueue_head(&sq->sync_queue);
- sq->busy = 0;
- }
- #if 0 /* blocking open() */
- static inline void sq_wake_up(struct sound_queue *sq, struct file *file,
- mode_t mode)
- {
- if (file->f_mode & mode) {
- sq->busy = 0; /* CHECK: IS THIS OK??? */
- WAKE_UP(sq->open_queue);
- }
- }
- #endif
- static int sq_open2(struct sound_queue *sq, struct file *file, mode_t mode,
- int numbufs, int bufsize)
- {
- int rc = 0;
- if (file->f_mode & mode) {
- if (sq->busy) {
- #if 0 /* blocking open() */
- rc = -EBUSY;
- if (file->f_flags & O_NONBLOCK)
- return rc;
- rc = -EINTR;
- while (sq->busy) {
- SLEEP(sq->open_queue);
- if (signal_pending(current))
- return rc;
- }
- rc = 0;
- #else
- /* OSS manual says we will return EBUSY regardless
- of O_NOBLOCK.
- */
- return -EBUSY ;
- #endif
- }
- sq->busy = 1; /* Let's play spot-the-race-condition */
- /* allocate the default number & size of buffers.
- (i.e. specified in _setup() or as module params)
- can't be changed at the moment - but _could_ be perhaps
- in the setfragments ioctl.
- */
- if (( rc = sq_allocate_buffers(sq, numbufs, bufsize))) {
- #if 0 /* blocking open() */
- sq_wake_up(sq, file, mode);
- #else
- sq->busy = 0 ;
- #endif
- return rc;
- }
- sq->open_mode = file->f_mode;
- }
- return rc;
- }
- #define write_sq_init_waitqueue() sq_init_waitqueue(&write_sq)
- #if 0 /* blocking open() */
- #define write_sq_wake_up(file) sq_wake_up(&write_sq, file, FMODE_WRITE)
- #endif
- #define write_sq_release_buffers() sq_release_buffers(&write_sq)
- #define write_sq_open(file)
- sq_open2(&write_sq, file, FMODE_WRITE, numWriteBufs, writeBufSize )
- #ifdef HAS_RECORD
- #define read_sq_init_waitqueue() sq_init_waitqueue(&read_sq)
- #if 0 /* blocking open() */
- #define read_sq_wake_up(file) sq_wake_up(&read_sq, file, FMODE_READ)
- #endif
- #define read_sq_release_buffers() sq_release_buffers(&read_sq)
- #define read_sq_open(file)
- sq_open2(&read_sq, file, FMODE_READ, numReadBufs, readBufSize )
- #else
- #define read_sq_init_waitqueue() do {} while (0)
- #if 0 /* blocking open() */
- #define read_sq_wake_up(file) do {} while (0)
- #endif
- #define read_sq_release_buffers() do {} while (0)
- #define sq_reset_input() do {} while (0)
- #endif
- static int sq_open(struct inode *inode, struct file *file)
- {
- int rc;
- dmasound.mach.open();
- if ((rc = write_sq_open(file))) { /* checks the f_mode */
- dmasound.mach.release();
- return rc;
- }
- #ifdef HAS_RECORD
- if (dmasound.mach.record) {
- if ((rc = read_sq_open(file))) { /* checks the f_mode */
- dmasound.mach.release();
- return rc;
- }
- } else { /* no record function installed; in compat mode */
- if (file->f_mode & FMODE_READ) {
- /* TODO: if O_RDWR, release any resources grabbed by write part */
- dmasound.mach.release() ;
- /* I think this is what is required by open(2) */
- return -ENXIO ;
- }
- }
- #else /* !HAS_RECORD */
- if (file->f_mode & FMODE_READ) {
- /* TODO: if O_RDWR, release any resources grabbed by write part */
- dmasound.mach.release() ;
- return -ENXIO ; /* I think this is what is required by open(2) */
- }
- #endif /* HAS_RECORD */
- if (dmasound.mach.sq_open)
- dmasound.mach.sq_open(file->f_mode);
- /* CHECK whether this is sensible - in the case that dsp0 could be opened
- O_RDONLY and dsp1 could be opened O_WRONLY
- */
- dmasound.minDev = MINOR(inode->i_rdev) & 0x0f;
- /* OK. - we should make some attempt at consistency. At least the H'ware
- options should be set with a valid mode. We will make it that the LL
- driver must supply defaults for hard & soft params.
- */
- if (shared_resource_owner == 0) {
- /* you can make this AFMT_U8/mono/8K if you want to mimic old
- OSS behaviour - while we still have soft translations ;-) */
- dmasound.soft = dmasound.mach.default_soft ;
- dmasound.dsp = dmasound.mach.default_soft ;
- dmasound.hard = dmasound.mach.default_hard ;
- }
- #ifndef DMASOUND_STRICT_OSS_COMPLIANCE
- /* none of the current LL drivers can actually do this "native" at the moment
- OSS does not really require us to supply /dev/audio if we can't do it.
- */
- if (dmasound.minDev == SND_DEV_AUDIO) {
- sound_set_speed(8000);
- sound_set_stereo(0);
- sound_set_format(AFMT_MU_LAW);
- }
- #endif
- return 0;
- }
- static void sq_reset_output(void)
- {
- sound_silence(); /* this _must_ stop DMA, we might be about to lose the buffers */
- write_sq.active = 0;
- write_sq.count = 0;
- write_sq.rear_size = 0;
- /* write_sq.front = (write_sq.rear+1) % write_sq.max_count;*/
- write_sq.front = 0 ;
- write_sq.rear = -1 ; /* same as for set-up */
- /* OK - we can unlock the parameters and fragment settings */
- write_sq.locked = 0 ;
- write_sq.user_frags = 0 ;
- write_sq.user_frag_size = 0 ;
- }
- #ifdef HAS_RECORD
- static void sq_reset_input(void)
- {
- if (dmasound.mach.record && read_sq.active) {
- if (dmasound.mach.abort_read) { /* this routine must really be present */
- read_sq.syncing = 1 ;
- /* this can use the read_sq.sync_queue to sleep if
- necessary - it should not return until DMA
- is really stopped - because we might deallocate
- the buffers as the next action...
- */
- dmasound.mach.abort_read() ;
- } else {
- printk(KERN_ERR
- "dmasound_core: %s has no abort_read()!! all bets are offn",
- dmasound.mach.name) ;
- }
- }
- read_sq.syncing =
- read_sq.active =
- read_sq.front =
- read_sq.count =
- read_sq.rear = 0 ;
- /* OK - we can unlock the parameters and fragment settings */
- read_sq.locked = 0 ;
- read_sq.user_frags = 0 ;
- read_sq.user_frag_size = 0 ;
- }
- #endif
- static void sq_reset(void)
- {
- sq_reset_output() ;
- sq_reset_input() ;
- /* we could consider resetting the shared_resources_owner here... but I
- think it is probably still rather non-obvious to application writer
- */
- /* we release everything else though */
- shared_resources_initialised = 0 ;
- }
- static int sq_fsync(struct file *filp, struct dentry *dentry)
- {
- int rc = 0;
- write_sq.syncing |= 1;
- sq_play(); /* there may be an incomplete frame waiting */
- while (write_sq.active) {
- SLEEP(write_sq.sync_queue);
- if (signal_pending(current)) {
- /* While waiting for audio output to drain, an
- * interrupt occurred. Stop audio output immediately
- * and clear the queue. */
- sq_reset_output();
- rc = -EINTR;
- break;
- }
- }
- /* flag no sync regardless of whether we had a DSP_POST or not */
- write_sq.syncing = 0 ;
- return rc;
- }
- static int sq_release(struct inode *inode, struct file *file)
- {
- int rc = 0;
- lock_kernel();
- #ifdef HAS_RECORD
- /* probably best to do the read side first - so that time taken to do it
- overlaps with playing any remaining output samples.
- */
- if (file->f_mode & FMODE_READ) {
- sq_reset_input() ; /* make sure dma is stopped and all is quiet */
- read_sq_release_buffers();
- read_sq.busy = 0;
- }
- #endif
- if (file->f_mode & FMODE_WRITE) {
- if (write_sq.busy)
- rc = sq_fsync(file, file->f_dentry);
- sq_reset_output() ; /* make sure dma is stopped and all is quiet */
- write_sq_release_buffers();
- write_sq.busy = 0;
- }
- if (file->f_mode & shared_resource_owner) { /* it's us that has them */
- shared_resource_owner = 0 ;
- shared_resources_initialised = 0 ;
- dmasound.hard = dmasound.mach.default_hard ;
- }
- dmasound.mach.release();
- #if 0 /* blocking open() */
- /* Wake up a process waiting for the queue being released.
- * Note: There may be several processes waiting for a call
- * to open() returning. */
- /* Iain: hmm I don't understand this next comment ... */
- /* There is probably a DOS atack here. They change the mode flag. */
- /* XXX add check here,*/
- read_sq_wake_up(file); /* checks f_mode */
- write_sq_wake_up(file); /* checks f_mode */
- #endif /* blocking open() */
- unlock_kernel();
- return rc;
- }
- /* here we see if we have a right to modify format, channels, size and so on
- if no-one else has claimed it already then we do...
- TODO: We might change this to mask O_RDWR such that only one or the other channel
- is the owner - if we have problems.
- */
- static int shared_resources_are_mine(mode_t md)
- {
- if (shared_resource_owner)
- return (shared_resource_owner & md ) ;
- else {
- shared_resource_owner = md ;
- return 1 ;
- }
- }
- /* if either queue is locked we must deny the right to change shared params
- */
- static int queues_are_quiescent(void)
- {
- #ifdef HAS_RECORD
- if (dmasound.mach.record)
- if (read_sq.locked)
- return 0 ;
- #endif
- if (write_sq.locked)
- return 0 ;
- return 1 ;
- }
- /* check and set a queue's fragments per user's wishes...
- we will check against the pre-defined literals and the actual sizes.
- This is a bit fraught - because soft translations can mess with our
- buffer requirements *after* this call - OSS says "call setfrags first"
- */
- /* It is possible to replace all the -EINVAL returns with an override that
- just puts the allowable value in. This may be what many OSS apps require
- */
- static int set_queue_frags(struct sound_queue *sq, int bufs, int size)
- {
- if (sq->locked) {
- #ifdef DEBUG_DMASOUND
- printk("dmasound_core: tried to set_queue_frags on a locked queuen") ;
- #endif
- return -EINVAL ;
- }
- if ((size < MIN_FRAG_SIZE) || (size > MAX_FRAG_SIZE))
- return -EINVAL ;
- size = (1<<size) ; /* now in bytes */
- if (size > sq->bufSize)
- return -EINVAL ; /* this might still not work */
- if (bufs <= 0)
- return -EINVAL ;
- if (bufs > sq->numBufs) /* the user is allowed say "don't care" with 0x7fff */
- bufs = sq->numBufs ;
- /* there is, currently, no way to specify max_active separately
- from max_count. This could be a LL driver issue - I guess
- if there is a requirement for these values to be different then
- we will have to pass that info. up to this level.
- */
- sq->user_frags =
- sq->max_active = bufs ;
- sq->user_frag_size = size ;
- return 0 ;
- }
- static int sq_ioctl(struct inode *inode, struct file *file, u_int cmd,
- u_long arg)
- {
- int val, result;
- u_long fmt;
- int data;
- int size, nbufs;
- audio_buf_info info;
- switch (cmd) {
- case SNDCTL_DSP_RESET:
- sq_reset();
- return 0;
- break ;
- case SNDCTL_DSP_GETFMTS:
- fmt = dmasound.mach.hardware_afmts ; /* this is what OSS says.. */
- return IOCTL_OUT(arg, fmt);
- break ;
- case SNDCTL_DSP_GETBLKSIZE:
- /* this should tell the caller about bytes that the app can
- read/write - the app doesn't care about our internal buffers.
- We force sq_setup() here as per OSS 1.1 (which should
- compute the values necessary).
- Since there is no mechanism to specify read/write separately, for
- fds opened O_RDWR, the write_sq values will, arbitrarily, overwrite
- the read_sq ones.
- */
- size = 0 ;
- #ifdef HAS_RECORD
- if (dmasound.mach.record && (file->f_mode & FMODE_READ)) {
- if ( !read_sq.locked )
- sq_setup(&read_sq) ; /* set params */
- size = read_sq.user_frag_size ;
- }
- #endif
- if (file->f_mode & FMODE_WRITE) {
- if ( !write_sq.locked )
- sq_setup(&write_sq) ;
- size = write_sq.user_frag_size ;
- }
- return IOCTL_OUT(arg, size);
- break ;
- case SNDCTL_DSP_POST:
- /* all we are going to do is to tell the LL that any
- partial frags can be queued for output.
- The LL will have to clear this flag when last output
- is queued.
- */
- write_sq.syncing |= 0x2 ;
- sq_play() ;
- return 0 ;
- case SNDCTL_DSP_SYNC:
- /* This call, effectively, has the same behaviour as SNDCTL_DSP_RESET
- except that it waits for output to finish before resetting
- everything - read, however, is killed imediately.
- */
- result = 0 ;
- if ((file->f_mode & FMODE_READ) && dmasound.mach.record)
- sq_reset_input() ;
- if (file->f_mode & FMODE_WRITE) {
- result = sq_fsync(file, file->f_dentry);
- sq_reset_output() ;
- }
- /* if we are the shared resource owner then release them */
- if (file->f_mode & shared_resource_owner)
- shared_resources_initialised = 0 ;
- return result ;
- break ;
- case SNDCTL_DSP_SPEED:
- /* changing this on the fly will have wierd effects on the sound.
- Where there are rate conversions implemented in soft form - it
- will cause the _ctx_xxx() functions to be substituted.
- However, there doesn't appear to be any reason to dis-allow it from
- a driver pov.
- */
- if (shared_resources_are_mine(file->f_mode)) {
- IOCTL_IN(arg, data);
- data = sound_set_speed(data) ;
- shared_resources_initialised = 0 ;
- return IOCTL_OUT(arg, data);
- } else
- return -EINVAL ;
- break ;
- /* OSS says these next 4 actions are undefined when the device is
- busy/active - we will just return -EINVAL.
- To be allowed to change one - (a) you have to own the right
- (b) the queue(s) must be quiescent
- */
- case SNDCTL_DSP_STEREO:
- if (shared_resources_are_mine(file->f_mode) &&
- queues_are_quiescent()) {
- IOCTL_IN(arg, data);
- shared_resources_initialised = 0 ;
- return IOCTL_OUT(arg, sound_set_stereo(data));
- } else
- return -EINVAL ;
- break ;
- case SOUND_PCM_WRITE_CHANNELS:
- if (shared_resources_are_mine(file->f_mode) &&
- queues_are_quiescent()) {
- IOCTL_IN(arg, data);
- /* the user might ask for 20 channels, we will return 1 or 2 */
- shared_resources_initialised = 0 ;
- return IOCTL_OUT(arg, sound_set_stereo(data-1)+1);
- } else
- return -EINVAL ;
- break ;
- case SOUND_PCM_READ_CHANNELS:
- return IOCTL_OUT(arg, dmasound.soft.stereo+1);
- case SNDCTL_DSP_SETFMT:
- if (shared_resources_are_mine(file->f_mode) &&
- queues_are_quiescent()) {
- int format;
- IOCTL_IN(arg, data);
- shared_resources_initialised = 0 ;
- format = sound_set_format(data);
- result = IOCTL_OUT(arg, format);
- if (result < 0)
- return result;
- return 0;
- } else
- return -EINVAL ;
- break ;
- case SNDCTL_DSP_SUBDIVIDE:
- return -EINVAL ;
- break;
- case SNDCTL_DSP_SETFRAGMENT:
- /* we can do this independently for the two queues - with the
- proviso that for fds opened O_RDWR we cannot separate the
- actions and both queues will be set per the last call.
- NOTE: this does *NOT* actually set the queue up - merely
- registers our intentions.
- */
- IOCTL_IN(arg, data);
- result = 0 ;
- nbufs = (data >> 16) & 0x7fff ; /* 0x7fff is 'use maximum' */
- size = data & 0xffff;
- #ifdef HAS_RECORD
- if ((file->f_mode & FMODE_READ) && dmasound.mach.record) {
- result = set_queue_frags(&read_sq, nbufs, size) ;
- if (result)
- return result ;
- }
- #endif
- if (file->f_mode & FMODE_WRITE) {
- result = set_queue_frags(&write_sq, nbufs, size) ;
- if (result)
- return result ;
- }
- /* NOTE: this return value is irrelevant - OSS specifically says that
- the value is 'random' and that the user _must_ check the actual
- frags values using SNDCTL_DSP_GETBLKSIZE or similar */
- return IOCTL_OUT(arg, data);
- break ;
- case SNDCTL_DSP_GETOSPACE:
- /*
- */
- if (file->f_mode & FMODE_WRITE) {
- if ( !write_sq.locked )
- sq_setup(&write_sq) ;
- info.fragments = write_sq.max_active - write_sq.count;
- info.fragstotal = write_sq.max_active;
- info.fragsize = write_sq.user_frag_size;
- info.bytes = info.fragments * info.fragsize;
- if (copy_to_user((void *)arg, &info, sizeof(info)))
- return -EFAULT;
- return 0;
- } else
- return -EINVAL ;
- break ;
- case SNDCTL_DSP_GETCAPS:
- val = dmasound.mach.capabilities & 0xffffff00;
- return IOCTL_OUT(arg,val);
- default:
- return mixer_ioctl(inode, file, cmd, arg);
- }
- return -EINVAL;
- }
- static struct file_operations sq_fops =
- {
- owner: THIS_MODULE,
- llseek: no_llseek,
- write: sq_write,
- poll: sq_poll,
- ioctl: sq_ioctl,
- open: sq_open,
- release: sq_release,
- #ifdef HAS_RECORD
- read: NULL /* default to no read for compat mode */
- #endif
- };
- static int __init sq_init(void)
- {
- #ifndef MODULE
- int sq_unit;
- #endif
- #ifdef HAS_RECORD
- if (dmasound.mach.record)
- sq_fops.read = sq_read ;
- #endif
- sq_unit = register_sound_dsp(&sq_fops, -1);
- if (sq_unit < 0) {
- printk(KERN_ERR "dmasound_core: couldn't register fopsn") ;
- return sq_unit ;
- }
- write_sq_init_waitqueue();
- read_sq_init_waitqueue();
- /* These parameters will be restored for every clean open()
- * in the case of multiple open()s (e.g. dsp0 & dsp1) they
- * will be set so long as the shared resources have no owner.
- */
- if (shared_resource_owner == 0) {
- dmasound.soft = dmasound.mach.default_soft ;
- dmasound.hard = dmasound.mach.default_hard ;
- dmasound.dsp = dmasound.mach.default_soft ;
- shared_resources_initialised = 0 ;
- }
- return 0 ;
- }
- /*
- * /dev/sndstat
- */
- /* we allow more space for record-enabled because there are extra output lines.
- the number here must include the amount we are prepared to give to the low-level
- driver.
- */
- #ifdef HAS_RECORD
- #define STAT_BUFF_LEN 1024
- #else
- #define STAT_BUFF_LEN 768
- #endif
- /* this is how much space we will allow the low-level driver to use
- in the stat buffer. Currently, 2 * (80 character line + <NL>).
- We do not police this (it is up to the ll driver to be honest).
- */
- #define LOW_LEVEL_STAT_ALLOC 162
- static struct {
- int busy;
- char buf[STAT_BUFF_LEN]; /* state.buf should not overflow! */
- int len, ptr;
- } state;
- /* publish this function for use by low-level code, if required */
- char *get_afmt_string(int afmt)
- {
- switch(afmt) {
- case AFMT_MU_LAW:
- return "mu-law";
- break;
- case AFMT_A_LAW:
- return "A-law";
- break;
- case AFMT_U8:
- return "unsigned 8 bit";
- break;
- case AFMT_S8:
- return "signed 8 bit";
- break;
- case AFMT_S16_BE:
- return "signed 16 bit BE";
- break;
- case AFMT_U16_BE:
- return "unsigned 16 bit BE";
- break;
- case AFMT_S16_LE:
- return "signed 16 bit LE";
- break;
- case AFMT_U16_LE:
- return "unsigned 16 bit LE";
- break;
- case 0:
- return "format not set" ;
- break ;
- default:
- break ;
- }
- return "ERROR: Unsupported AFMT_XXXX code" ;
- }
- static int state_open(struct inode *inode, struct file *file)
- {
- char *buffer = state.buf;
- int len = 0;
- if (state.busy)
- return -EBUSY;
- dmasound.mach.open();
- state.ptr = 0;
- state.busy = 1;
- len += sprintf(buffer+len, "%sDMA sound driver rev %03d :n",
- dmasound.mach.name, (DMASOUND_CORE_REVISION<<4) +
- ((dmasound.mach.version>>8) & 0x0f));
- len += sprintf(buffer+len,
- "Core driver edition %02d.%02d : %s driver edition %02d.%02dn",
- DMASOUND_CORE_REVISION, DMASOUND_CORE_EDITION, dmasound.mach.name2,
- (dmasound.mach.version >> 8), (dmasound.mach.version & 0xff)) ;
- /* call the low-level module to fill in any stat info. that it has
- if present. Maximum buffer usage is specified.
- */
- if (dmasound.mach.state_info)
- len += dmasound.mach.state_info(buffer+len,
- (size_t) LOW_LEVEL_STAT_ALLOC) ;
- /* make usage of the state buffer as deterministic as poss.
- exceptional conditions could cause overrun - and this is flagged as
- a kernel error.
- */
- /* formats and settings */
- len += sprintf(buffer+len,"tt === Formats & settings ===n") ;
- len += sprintf(buffer+len,"Parameter %20s%20sn","soft","hard") ;
- len += sprintf(buffer+len,"Format :%20s%20sn",
- get_afmt_string(dmasound.soft.format),
- get_afmt_string(dmasound.hard.format));
- len += sprintf(buffer+len,"Samp Rate:%14d s/sec%14d s/secn",
- dmasound.soft.speed, dmasound.hard.speed);
- len += sprintf(buffer+len,"Channels :%20s%20sn",
- dmasound.soft.stereo ? "stereo" : "mono",
- dmasound.hard.stereo ? "stereo" : "mono" );
- /* sound queue status */
- len += sprintf(buffer+len,"tt === Sound Queue status ===n");
- len += sprintf(buffer+len,"Allocated:%8s%6sn","Buffers","Size") ;
- len += sprintf(buffer+len,"%9s:%8d%6dn",
- "write", write_sq.numBufs, write_sq.bufSize) ;
- #ifdef HAS_RECORD
- if (dmasound.mach.record)
- len += sprintf(buffer+len,"%9s:%8d%6dn",
- "read", read_sq.numBufs, read_sq.bufSize) ;
- #endif
- len += sprintf(buffer+len,
- "Current : MaxFrg FragSiz MaxAct Frnt Rear "
- "Cnt RrSize A B S L xrunsn") ;
- len += sprintf(buffer+len,"%9s:%7d%8d%7d%5d%5d%4d%7d%2d%2d%2d%2d%7dn",
- "write", write_sq.max_count, write_sq.block_size,
- write_sq.max_active, write_sq.front, write_sq.rear,
- write_sq.count, write_sq.rear_size, write_sq.active,
- write_sq.busy, write_sq.syncing, write_sq.locked, write_sq.xruns) ;
- #ifdef HAS_RECORD
- if (dmasound.mach.record)
- len += sprintf(buffer+len,"%9s:%7d%8d%7d%5d%5d%4d%7d%2d%2d%2d%2d%7dn",
- "read", read_sq.max_count, read_sq.block_size,
- read_sq.max_active, read_sq.front, read_sq.rear,
- read_sq.count, read_sq.rear_size, read_sq.active,
- read_sq.busy, read_sq.syncing, read_sq.locked, read_sq.xruns) ;
- #endif
- #ifdef DEBUG_DMASOUND
- printk("dmasound: stat buffer used %d bytesn", len) ;
- #endif
- if (len >= STAT_BUFF_LEN)
- printk(KERN_ERR "dmasound_core: stat buffer overflowed!n");
- state.len = len;
- return 0;
- }
- static int state_release(struct inode *inode, struct file *file)
- {
- lock_kernel();
- state.busy = 0;
- dmasound.mach.release();
- unlock_kernel();
- return 0;
- }
- static ssize_t state_read(struct file *file, char *buf, size_t count,
- loff_t *ppos)
- {
- int n = state.len - state.ptr;
- if (n > count)
- n = count;
- if (n <= 0)
- return 0;
- if (copy_to_user(buf, &state.buf[state.ptr], n))
- return -EFAULT;
- state.ptr += n;
- return n;
- }
- static struct file_operations state_fops = {
- owner: THIS_MODULE,
- llseek: no_llseek,
- read: state_read,
- open: state_open,
- release: state_release,
- };
- static int __init state_init(void)
- {
- #ifndef MODULE
- int state_unit;
- #endif
- state_unit = register_sound_special(&state_fops, SND_DEV_STATUS);
- if (state_unit < 0)
- return state_unit ;
- state.busy = 0;
- return 0 ;
- }
- /*
- * Config & Setup
- *
- * This function is called by _one_ chipset-specific driver
- */
- int __init dmasound_init(void)
- {
- int res ;
- #ifdef MODULE
- if (irq_installed)
- return -EBUSY;
- #endif
- /* Set up sound queue, /dev/audio and /dev/dsp. */
- /* Set default settings. */
- if ((res = sq_init()) < 0)
- return res ;
- /* Set up /dev/sndstat. */
- if ((res = state_init()) < 0)
- return res ;
- /* Set up /dev/mixer. */
- mixer_init();
- if (!dmasound.mach.irqinit()) {
- printk(KERN_ERR "DMA sound driver: Interrupt initialization failedn");
- return -ENODEV;
- }
- #ifdef MODULE
- irq_installed = 1;
- #endif
- printk(KERN_INFO "%s DMA sound driver rev %03d installedn",
- dmasound.mach.name, (DMASOUND_CORE_REVISION<<4) +
- ((dmasound.mach.version>>8) & 0x0f));
- printk(KERN_INFO
- "Core driver edition %02d.%02d : %s driver edition %02d.%02dn",
- DMASOUND_CORE_REVISION, DMASOUND_CORE_EDITION, dmasound.mach.name2,
- (dmasound.mach.version >> 8), (dmasound.mach.version & 0xff)) ;
- printk(KERN_INFO "Write will use %4d fragments of %7d bytes as defaultn",
- numWriteBufs, writeBufSize) ;
- #ifdef HAS_RECORD
- if (dmasound.mach.record)
- printk(KERN_INFO
- "Read will use %4d fragments of %7d bytes as defaultn",
- numReadBufs, readBufSize) ;
- #endif
- return 0;
- }
- #ifdef MODULE
- void dmasound_deinit(void)
- {
- if (irq_installed) {
- sound_silence();
- dmasound.mach.irqcleanup();
- irq_installed = 0;
- }
- write_sq_release_buffers();
- read_sq_release_buffers();
- if (mixer_unit >= 0)
- unregister_sound_mixer(mixer_unit);
- if (state_unit >= 0)
- unregister_sound_special(state_unit);
- if (sq_unit >= 0)
- unregister_sound_dsp(sq_unit);
- }
- #else /* !MODULE */
- static int __init dmasound_setup(char *str)
- {
- int ints[6], size;
- str = get_options(str, ARRAY_SIZE(ints), ints);
- /* check the bootstrap parameter for "dmasound=" */
- /* FIXME: other than in the most naive of cases there is no sense in these
- * buffers being other than powers of two. This is not checked yet.
- */
- switch (ints[0]) {
- #ifdef HAS_RECORD
- case 5:
- if ((ints[5] < 0) || (ints[5] > MAX_CATCH_RADIUS))
- printk("dmasound_setup: illegal catch radius, using default = %dn", catchRadius);
- else
- catchRadius = ints[5];
- /* fall through */
- case 4:
- if (ints[4] < MIN_BUFFERS)
- printk("dmasound_setup: illegal number of read buffers, using default = %dn",
- numReadBufs);
- else
- numReadBufs = ints[4];
- /* fall through */
- case 3:
- if ((size = ints[3]) < 256) /* check for small buffer specs */
- size <<= 10 ;
- if (size < MIN_BUFSIZE || size > MAX_BUFSIZE)
- printk("dmasound_setup: illegal read buffer size, using default = %dn", readBufSize);
- else
- readBufSize = size;
- /* fall through */
- #else
- case 3:
- if ((ints[3] < 0) || (ints[3] > MAX_CATCH_RADIUS))
- printk("dmasound_setup: illegal catch radius, using default = %dn", catchRadius);
- else
- catchRadius = ints[3];
- /* fall through */
- #endif
- case 2:
- if (ints[1] < MIN_BUFFERS)
- printk("dmasound_setup: illegal number of buffers, using default = %dn", numWriteBufs);
- else
- numWriteBufs = ints[1];
- /* fall through */
- case 1:
- if ((size = ints[2]) < 256) /* check for small buffer specs */
- size <<= 10 ;
- if (size < MIN_BUFSIZE || size > MAX_BUFSIZE)
- printk("dmasound_setup: illegal write buffer size, using default = %dn", writeBufSize);
- else
- writeBufSize = size;
- case 0:
- break;
- default:
- printk("dmasound_setup: illegal number of argumentsn");
- return 0;
- }
- return 1;
- }
- __setup("dmasound=", dmasound_setup);
- #endif /* !MODULE */
- /*
- * Conversion tables
- */
- #ifdef HAS_8BIT_TABLES
- /* 8 bit mu-law */
- char dmasound_ulaw2dma8[] = {
- -126, -122, -118, -114, -110, -106, -102, -98,
- -94, -90, -86, -82, -78, -74, -70, -66,
- -63, -61, -59, -57, -55, -53, -51, -49,
- -47, -45, -43, -41, -39, -37, -35, -33,
- -31, -30, -29, -28, -27, -26, -25, -24,
- -23, -22, -21, -20, -19, -18, -17, -16,
- -16, -15, -15, -14, -14, -13, -13, -12,
- -12, -11, -11, -10, -10, -9, -9, -8,
- -8, -8, -7, -7, -7, -7, -6, -6,
- -6, -6, -5, -5, -5, -5, -4, -4,
- -4, -4, -4, -4, -3, -3, -3, -3,
- -3, -3, -3, -3, -2, -2, -2, -2,
- -2, -2, -2, -2, -2, -2, -2, -2,
- -1, -1, -1, -1, -1, -1, -1, -1,
- -1, -1, -1, -1, -1, -1, -1, -1,
- -1, -1, -1, -1, -1, -1, -1, 0,
- 125, 121, 117, 113, 109, 105, 101, 97,
- 93, 89, 85, 81, 77, 73, 69, 65,
- 62, 60, 58, 56, 54, 52, 50, 48,
- 46, 44, 42, 40, 38, 36, 34, 32,
- 30, 29, 28, 27, 26, 25, 24, 23,
- 22, 21, 20, 19, 18, 17, 16, 15,
- 15, 14, 14, 13, 13, 12, 12, 11,
- 11, 10, 10, 9, 9, 8, 8, 7,
- 7, 7, 6, 6, 6, 6, 5, 5,
- 5, 5, 4, 4, 4, 4, 3, 3,
- 3, 3, 3, 3, 2, 2, 2, 2,
- 2, 2, 2, 2, 1, 1, 1, 1,
- 1, 1, 1, 1, 1, 1, 1, 1,
- 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0
- };
- /* 8 bit A-law */
- char dmasound_alaw2dma8[] = {
- -22, -21, -24, -23, -18, -17, -20, -19,
- -30, -29, -32, -31, -26, -25, -28, -27,
- -11, -11, -12, -12, -9, -9, -10, -10,
- -15, -15, -16, -16, -13, -13, -14, -14,
- -86, -82, -94, -90, -70, -66, -78, -74,
- -118, -114, -126, -122, -102, -98, -110, -106,
- -43, -41, -47, -45, -35, -33, -39, -37,
- -59, -57, -63, -61, -51, -49, -55, -53,
- -2, -2, -2, -2, -2, -2, -2, -2,
- -2, -2, -2, -2, -2, -2, -2, -2,
- -1, -1, -1, -1, -1, -1, -1, -1,
- -1, -1, -1, -1, -1, -1, -1, -1,
- -6, -6, -6, -6, -5, -5, -5, -5,
- -8, -8, -8, -8, -7, -7, -7, -7,
- -3, -3, -3, -3, -3, -3, -3, -3,
- -4, -4, -4, -4, -4, -4, -4, -4,
- 21, 20, 23, 22, 17, 16, 19, 18,
- 29, 28, 31, 30, 25, 24, 27, 26,
- 10, 10, 11, 11, 8, 8, 9, 9,
- 14, 14, 15, 15, 12, 12, 13, 13,
- 86, 82, 94, 90, 70, 66, 78, 74,
- 118, 114, 126, 122, 102, 98, 110, 106,
- 43, 41, 47, 45, 35, 33, 39, 37,
- 59, 57, 63, 61, 51, 49, 55, 53,
- 1, 1, 1, 1, 1, 1, 1, 1,
- 1, 1, 1, 1, 1, 1, 1, 1,
- 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0,
- 5, 5, 5, 5, 4, 4, 4, 4,
- 7, 7, 7, 7, 6, 6, 6, 6,
- 2, 2, 2, 2, 2, 2, 2, 2,
- 3, 3, 3, 3, 3, 3, 3, 3
- };
- #endif /* HAS_8BIT_TABLES */
- /*
- * Visible symbols for modules
- */
- EXPORT_SYMBOL(dmasound);
- EXPORT_SYMBOL(dmasound_init);
- #ifdef MODULE
- EXPORT_SYMBOL(dmasound_deinit);
- #endif
- EXPORT_SYMBOL(dmasound_write_sq);
- #ifdef HAS_RECORD
- EXPORT_SYMBOL(dmasound_read_sq);
- #endif
- EXPORT_SYMBOL(dmasound_catchRadius);
- #ifdef HAS_8BIT_TABLES
- EXPORT_SYMBOL(dmasound_ulaw2dma8);
- EXPORT_SYMBOL(dmasound_alaw2dma8);
- #endif
- EXPORT_SYMBOL(get_afmt_string) ;