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Diffstat (limited to 'sound/oss/dmasound/dmasound_core.c')
| -rw-r--r-- | sound/oss/dmasound/dmasound_core.c | 1829 |
1 files changed, 1829 insertions, 0 deletions
diff --git a/sound/oss/dmasound/dmasound_core.c b/sound/oss/dmasound/dmasound_core.c new file mode 100644 index 000000000000..c9302a1e515b --- /dev/null +++ b/sound/oss/dmasound/dmasound_core.c @@ -0,0 +1,1829 @@ +/* + * linux/sound/oss/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; +#endif /* MODULE */ + +/* software implemented recording volume! */ +uint software_input_volume = SW_INPUT_VOLUME_SCALE * SW_INPUT_VOLUME_DEFAULT; +EXPORT_SYMBOL(software_input_volume); + +/* control over who can modify resources shared between play/record */ +static mode_t shared_resource_owner; +static int shared_resources_initialised; + + /* + * Mid level stuff + */ + +struct sound_settings dmasound = { .lock = SPIN_LOCK_UNLOCKED }; + +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 __user *userPtr, + size_t userCount, u_char frame[], + ssize_t *frameUsed, ssize_t frameLeft) +{ + ssize_t (*ct_func)(const u_char __user *, 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) +{ + if (!try_module_get(dmasound.mach.owner)) + return -ENODEV; + mixer.busy = 1; + return 0; +} + +static int mixer_release(struct inode *inode, struct file *file) +{ + lock_kernel(); + mixer.busy = 0; + module_put(dmasound.mach.owner); + 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; + memset(&info, 0, sizeof(info)); + strlcpy(info.id, dmasound.mach.name2, sizeof(info.id)); + strlcpy(info.name, dmasound.mach.name2, sizeof(info.name)); + info.modify_counter = mixer.modify_counter; + if (copy_to_user((void __user *)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 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 = NULL; + 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) = NULL; + 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 queue\n") ; +#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 __user *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. + */ + + spin_lock_irqsave(&dmasound.lock, flags); + write_sq.syncing &= ~2 ; /* take out POST status */ + spin_unlock_irqrestore(&dmasound.lock, 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 __user *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; + + if (!try_module_get(dmasound.mach.owner)) + return -ENODEV; + + rc = write_sq_open(file); /* checks the f_mode */ + if (rc) + goto out; +#ifdef HAS_RECORD + if (dmasound.mach.record) { + rc = read_sq_open(file); /* checks the f_mode */ + if (rc) + goto out; + } 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 */ + rc = -ENXIO; + goto out; + } + } +#else /* !HAS_RECORD */ + if (file->f_mode & FMODE_READ) { + /* TODO: if O_RDWR, release any resources grabbed by write part */ + rc = -ENXIO ; /* I think this is what is required by open(2) */ + goto out; + } +#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 = iminor(inode) & 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; + out: + module_put(dmasound.mach.owner); + return rc; +} + +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 off\n", + 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; + int timeout = 5; + + 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; + } + if (!--timeout) { + printk(KERN_WARNING "dmasound: Timeout draining output\n"); + sq_reset_output(); + rc = -EIO; + 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 ; + } + + module_put(dmasound.mach.owner); + +#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 queue\n") ; +#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 SOUND_PCM_READ_RATE: + return IOCTL_OUT(arg, dmasound.soft.speed); + case SNDCTL_DSP_SPEED: + /* changing this on the fly will have weird 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 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; + if (format != data && data != AFMT_QUERY) + return -EINVAL; + return 0; + } else + return -EINVAL ; + case SNDCTL_DSP_SUBDIVIDE: + return -EINVAL ; + 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 __user *)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 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 fops\n") ; + 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; + + if (!try_module_get(dmasound.mach.owner)) + return -ENODEV; + 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.%02d\n", + 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,"\t\t === Formats & settings ===\n") ; + len += sprintf(buffer+len,"Parameter %20s%20s\n","soft","hard") ; + len += sprintf(buffer+len,"Format :%20s%20s\n", + get_afmt_string(dmasound.soft.format), + get_afmt_string(dmasound.hard.format)); + + len += sprintf(buffer+len,"Samp Rate:%14d s/sec%14d s/sec\n", + dmasound.soft.speed, dmasound.hard.speed); + + len += sprintf(buffer+len,"Channels :%20s%20s\n", + dmasound.soft.stereo ? "stereo" : "mono", + dmasound.hard.stereo ? "stereo" : "mono" ); + + /* sound queue status */ + + len += sprintf(buffer+len,"\t\t === Sound Queue status ===\n"); + len += sprintf(buffer+len,"Allocated:%8s%6s\n","Buffers","Size") ; + len += sprintf(buffer+len,"%9s:%8d%6d\n", + "write", write_sq.numBufs, write_sq.bufSize) ; +#ifdef HAS_RECORD + if (dmasound.mach.record) + len += sprintf(buffer+len,"%9s:%8d%6d\n", + "read", read_sq.numBufs, read_sq.bufSize) ; +#endif + len += sprintf(buffer+len, + "Current : MaxFrg FragSiz MaxAct Frnt Rear " + "Cnt RrSize A B S L xruns\n") ; + len += sprintf(buffer+len,"%9s:%7d%8d%7d%5d%5d%4d%7d%2d%2d%2d%2d%7d\n", + "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%7d\n", + "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 bytes\n", 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; + module_put(dmasound.mach.owner); + unlock_kernel(); + return 0; +} + +static ssize_t state_read(struct file *file, char __user *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 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 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 failed\n"); + return -ENODEV; + } +#ifdef MODULE + irq_installed = 1; +#endif + + printk(KERN_INFO "%s DMA sound driver rev %03d installed\n", + dmasound.mach.name, (DMASOUND_CORE_REVISION<<4) + + ((dmasound.mach.version>>8) & 0x0f)); + printk(KERN_INFO + "Core driver edition %02d.%02d : %s driver edition %02d.%02d\n", + 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 default\n", + numWriteBufs, writeBufSize) ; +#ifdef HAS_RECORD + if (dmasound.mach.record) + printk(KERN_INFO + "Read will use %4d fragments of %7d bytes as default\n", + 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 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: invalid catch radius, using default = %d\n", catchRadius); + else + catchRadius = ints[5]; + /* fall through */ + case 4: + if (ints[4] < MIN_BUFFERS) + printk("dmasound_setup: invalid number of read buffers, using default = %d\n", + 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: invalid read buffer size, using default = %d\n", readBufSize); + else + readBufSize = size; + /* fall through */ +#else + case 3: + if ((ints[3] < 0) || (ints[3] > MAX_CATCH_RADIUS)) + printk("dmasound_setup: invalid catch radius, using default = %d\n", catchRadius); + else + catchRadius = ints[3]; + /* fall through */ +#endif + case 2: + if (ints[1] < MIN_BUFFERS) + printk("dmasound_setup: invalid number of buffers, using default = %d\n", 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: invalid write buffer size, using default = %d\n", writeBufSize); + else + writeBufSize = size; + case 0: + break; + default: + printk("dmasound_setup: invalid number of arguments\n"); + 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) ; |