patch-2.2.16 linux/drivers/sound/i810_audio.c
Next file: linux/drivers/sound/maestro.c
Previous file: linux/drivers/sound/cmpci.c
Back to the patch index
Back to the overall index
- Lines: 1861
- Date:
Wed Jun 7 14:26:43 2000
- Orig file:
v2.2.15/linux/drivers/sound/i810_audio.c
- Orig date:
Wed Dec 31 16:00:00 1969
diff -urN v2.2.15/linux/drivers/sound/i810_audio.c linux/drivers/sound/i810_audio.c
@@ -0,0 +1,1859 @@
+/*
+ * Intel i810 and friends ICH driver for Linux
+ * Alan Cox <alan@redhat.com>
+ *
+ * Built from:
+ * Low level code: Zach Brown (original nonworking i810 OSS driver)
+ * Jaroslav Kysela <perex@suse.cz> (working ALSA driver)
+ *
+ * Framework: Thomas Sailer <sailer@ife.ee.ethz.ch>
+ * Extended by: Zach Brown <zab@redhat.com>
+ * and others..
+ *
+ * Hardware Provided By:
+ * Analog Devices (A major AC97 codec maker)
+ * Intel Corp (you've probably heard of them already)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ *
+ * Intel 810 theory of operation
+ *
+ * The chipset provides three DMA channels that talk to an AC97
+ * CODEC (AC97 is a digital/analog mixer standard). At its simplest
+ * you get 48Khz audio with basic volume and mixer controls. At the
+ * best you get rate adaption in the codec. We set the card up so
+ * that we never take completion interrupts but instead keep the card
+ * chasing its tail around a ring buffer. This is needed for mmap
+ * mode audio and happens to work rather well for non-mmap modes too.
+ *
+ * The board has one output channel for PCM audio (supported) and
+ * a stereo line in and mono microphone input. Again these are normally
+ * locked to 48Khz only. Right now recording is not finished.
+ *
+ * There is no midi support, no synth support. Use timidity. To get
+ * esd working you need to use esd -r 48000 as it won't probe 48KHz
+ * by default. mpg123 can't handle 48Khz only audio so use xmms.
+ */
+
+#include <linux/module.h>
+#include <linux/version.h>
+#include <linux/string.h>
+#include <linux/ctype.h>
+#include <linux/ioport.h>
+#include <linux/sched.h>
+#include <linux/delay.h>
+#include <linux/sound.h>
+#include <linux/malloc.h>
+#include <linux/soundcard.h>
+#include <linux/pci.h>
+#include <asm/io.h>
+#include <asm/dma.h>
+#include <linux/init.h>
+#include <linux/poll.h>
+#include <asm/spinlock.h>
+#include <linux/ac97_codec.h>
+#include <asm/uaccess.h>
+#include <asm/hardirq.h>
+
+#ifndef PCI_DEVICE_ID_INTEL_82801
+#define PCI_DEVICE_ID_INTEL_82801 0x2415
+#endif
+#ifndef PCI_DEVICE_ID_INTEL_82901
+#define PCI_DEVICE_ID_INTEL_82901 0x2425
+#endif
+#ifndef PCI_DEVICE_ID_INTEL_440MX
+#define PCI_DEVICE_ID_INTEL_440MX 0x7195
+#endif
+
+#define ADC_RUNNING 1
+#define DAC_RUNNING 2
+
+#define I810_FMT_16BIT 1 /* These are fixed in fact */
+#define I810_FMT_STEREO 2
+#define I810_FMT_MASK 3
+
+/* the 810's array of pointers to data buffers */
+
+struct sg_item {
+#define BUSADDR_MASK 0xFFFFFFFE
+ u32 busaddr;
+#define CON_IOC 0x80000000 /* interrupt on completion */
+#define CON_BUFPAD 0x40000000 /* pad underrun with last sample, else 0 */
+#define CON_BUFLEN_MASK 0x0000ffff /* buffer length in samples */
+ u32 control;
+};
+
+/* an instance of the i810 channel */
+#define SG_LEN 32
+struct i810_channel
+{
+ /* these sg guys should probably be allocated
+ seperately as nocache. Must be 8 byte aligned */
+ struct sg_item sg[SG_LEN]; /* 32*8 */
+ u32 offset; /* 4 */
+ u32 port; /* 4 */
+ u32 used; /* 4 */
+ u32 num; /* 4 */
+};
+
+/*
+ * we have 3 seperate dma engines. pcm in, pcm out, and mic.
+ * each dma engine has controlling registers. These goofy
+ * names are from the datasheet, but make it easy to write
+ * code while leafing through it. Right now we don't support
+ * the MIC input.
+ */
+
+#define ENUM_ENGINE(PRE,DIG) \
+enum { \
+ ##PRE##_BDBAR = 0x##DIG##0, /* Buffer Descriptor list Base Address */ \
+ ##PRE##_CIV = 0x##DIG##4, /* Current Index Value */ \
+ ##PRE##_LVI = 0x##DIG##5, /* Last Valid Index */ \
+ ##PRE##_SR = 0x##DIG##6, /* Status Register */ \
+ ##PRE##_PICB = 0x##DIG##8, /* Position In Current Buffer */ \
+ ##PRE##_PIV = 0x##DIG##a, /* Prefetched Index Value */ \
+ ##PRE##_CR = 0x##DIG##b /* Control Register */ \
+}
+
+ENUM_ENGINE(OFF,0); /* Offsets */
+ENUM_ENGINE(PI,0); /* PCM In */
+ENUM_ENGINE(PO,1); /* PCM Out */
+ENUM_ENGINE(MC,2); /* Mic In */
+
+enum {
+ GLOB_CNT = 0x2c, /* Global Control */
+ GLOB_STA = 0x30, /* Global Status */
+ CAS = 0x34 /* Codec Write Semaphore Register */
+};
+
+/* interrupts for a dma engine */
+#define DMA_INT_FIFO (1<<4) /* fifo under/over flow */
+#define DMA_INT_COMPLETE (1<<3) /* buffer read/write complete and ioc set */
+#define DMA_INT_LVI (1<<2) /* last valid done */
+#define DMA_INT_CELV (1<<1) /* last valid is current */
+#define DMA_INT_MASK (DMA_INT_FIFO|DMA_INT_COMPLETE|DMA_INT_LVI)
+
+/* interrupts for the whole chip */
+#define INT_SEC (1<<11)
+#define INT_PRI (1<<10)
+#define INT_MC (1<<7)
+#define INT_PO (1<<6)
+#define INT_PI (1<<5)
+#define INT_MO (1<<2)
+#define INT_NI (1<<1)
+#define INT_GPI (1<<0)
+#define INT_MASK (INT_SEC|INT_PRI|INT_MC|INT_PO|INT_PI|INT_MO|INT_NI|INT_GPI)
+
+
+#define DRIVER_VERSION "0.02"
+
+/* magic numbers to protect our data structures */
+#define I810_CARD_MAGIC 0x5072696E /* "Prin" */
+#define I810_STATE_MAGIC 0x63657373 /* "cess" */
+#define NR_HW_CH 3
+
+/* maxinum number of AC97 codecs connected, AC97 2.0 defined 4 */
+#define NR_AC97 2
+
+/* minor number of /dev/dspW */
+#define SND_DEV_DSP8 1
+
+/* minor number of /dev/dspW */
+#define SND_DEV_DSP16 1
+
+static const unsigned sample_size[] = { 1, 2, 2, 4 };
+static const unsigned sample_shift[] = { 0, 1, 1, 2 };
+
+enum {
+ ICH82801AA = 0,
+ ICH82901AB,
+ INTEL440MX
+};
+
+/* "software" or virtual channel, an instance of opened /dev/dsp */
+struct i810_state {
+ unsigned int magic;
+ struct i810_card *card; /* Card info */
+
+ /* single open lock mechanism, only used for recording */
+ struct semaphore open_sem;
+ struct wait_queue *open_wait;
+
+ /* file mode */
+ mode_t open_mode;
+
+ /* virtual channel number */
+ int virt;
+
+ struct dmabuf {
+ /* wave sample stuff */
+ unsigned int rate;
+ unsigned char fmt, enable;
+
+ /* hardware channel */
+ struct i810_channel *channel;
+
+ /* OSS buffer management stuff */
+ void *rawbuf;
+ unsigned buforder;
+ unsigned numfrag;
+ unsigned fragshift;
+
+ /* our buffer acts like a circular ring */
+ unsigned hwptr; /* where dma last started, updated by update_ptr */
+ unsigned swptr; /* where driver last clear/filled, updated by read/write */
+ int count; /* bytes to be comsumed or been generated by dma machine */
+ unsigned total_bytes; /* total bytes dmaed by hardware */
+
+ unsigned error; /* number of over/underruns */
+ struct wait_queue *wait; /* put process on wait queue when no more space in buffer */
+
+ /* redundant, but makes calculations easier */
+ unsigned fragsize;
+ unsigned dmasize;
+ unsigned fragsamples;
+
+ /* OSS stuff */
+ unsigned mapped:1;
+ unsigned ready:1;
+ unsigned endcleared:1;
+ unsigned update_flag;
+ unsigned ossfragshift;
+ int ossmaxfrags;
+ unsigned subdivision;
+ } dmabuf;
+};
+
+
+struct i810_card {
+ struct i810_channel channel[3];
+ unsigned int magic;
+
+ /* We keep i810 cards in a linked list */
+ struct i810_card *next;
+
+ /* The i810 has a certain amount of cross channel interaction
+ so we use a single per card lock */
+ spinlock_t lock;
+
+ /* PCI device stuff */
+ struct pci_dev * pci_dev;
+ u16 pci_id;
+
+ /* soundcore stuff */
+ int dev_audio;
+
+ /* structures for abstraction of hardware facilities, codecs, banks and channels*/
+ struct ac97_codec *ac97_codec[NR_AC97];
+ struct i810_state *states[NR_HW_CH];
+
+ u16 ac97_features;
+
+ /* hardware resources */
+ unsigned long iobase;
+ unsigned long ac97base;
+ u32 irq;
+
+ /* Function support */
+ struct i810_channel *(*alloc_pcm_channel)(struct i810_card *);
+ struct i810_channel *(*alloc_rec_pcm_channel)(struct i810_card *);
+ void (*free_pcm_channel)(struct i810_card *, int chan);
+};
+
+static struct i810_card *devs = NULL;
+
+static int i810_open_mixdev(struct inode *inode, struct file *file);
+static int i810_release_mixdev(struct inode *inode, struct file *file);
+static int i810_ioctl_mixdev(struct inode *inode, struct file *file, unsigned int cmd,
+ unsigned long arg);
+static loff_t i810_llseek(struct file *file, loff_t offset, int origin);
+
+extern __inline__ unsigned ld2(unsigned int x)
+{
+ unsigned r = 0;
+
+ if (x >= 0x10000) {
+ x >>= 16;
+ r += 16;
+ }
+ if (x >= 0x100) {
+ x >>= 8;
+ r += 8;
+ }
+ if (x >= 0x10) {
+ x >>= 4;
+ r += 4;
+ }
+ if (x >= 4) {
+ x >>= 2;
+ r += 2;
+ }
+ if (x >= 2)
+ r++;
+ return r;
+}
+
+static u16 i810_ac97_get(struct ac97_codec *dev, u8 reg);
+static void i810_ac97_set(struct ac97_codec *dev, u8 reg, u16 data);
+
+static struct i810_channel *i810_alloc_pcm_channel(struct i810_card *card)
+{
+ if(card->channel[1].used==1)
+ return NULL;
+ card->channel[1].used=1;
+ card->channel[1].offset = 0;
+ card->channel[1].port = 0x10;
+ card->channel[1].num=1;
+ return &card->channel[1];
+}
+
+static struct i810_channel *i810_alloc_rec_pcm_channel(struct i810_card *card)
+{
+ if(card->channel[0].used==1)
+ return NULL;
+ card->channel[0].used=1;
+ card->channel[0].offset = 0;
+ card->channel[0].port = 0x00;
+ card->channel[1].num=0;
+ return &card->channel[0];
+}
+
+static void i810_free_pcm_channel(struct i810_card *card, int channel)
+{
+ card->channel[channel].used=0;
+}
+
+/* set playback sample rate */
+static unsigned int i810_set_dac_rate(struct i810_state * state, unsigned int rate)
+{
+ struct dmabuf *dmabuf = &state->dmabuf;
+ u16 dacp, rp;
+ struct ac97_codec *codec=state->card->ac97_codec[0];
+
+ if(!(state->card->ac97_features&0x0001))
+ {
+ dmabuf->rate=48000;
+ return 48000;
+ }
+
+ if (rate > 48000)
+ rate = 48000;
+ if (rate < 4000)
+ rate = 4000;
+
+ /* Power down the DAC */
+ dacp=i810_ac97_get(codec, AC97_POWER_CONTROL);
+ i810_ac97_set(codec, AC97_POWER_CONTROL, dacp|0x0200);
+
+ /* Load the rate and read the effective rate */
+ i810_ac97_set(codec, AC97_PCM_FRONT_DAC_RATE, rate);
+ rp=i810_ac97_get(codec, AC97_PCM_FRONT_DAC_RATE);
+
+// printk("DAC rate set to %d Returned %d\n",
+// rate, (int)rp);
+
+ rate=rp;
+
+ /* Power it back up */
+ i810_ac97_set(codec, AC97_POWER_CONTROL, dacp);
+
+ dmabuf->rate = rate;
+#ifdef DEBUG
+ printk("i810_audio: called i810_set_dac_rate : rate = %d\n", rate);
+#endif
+
+ return rate;
+}
+
+/* set recording sample rate */
+static unsigned int i810_set_adc_rate(struct i810_state * state, unsigned int rate)
+{
+ struct dmabuf *dmabuf = &state->dmabuf;
+ u16 dacp, rp;
+ struct ac97_codec *codec=state->card->ac97_codec[0];
+
+ if(!(state->card->ac97_features&0x0001))
+ {
+ dmabuf->rate = 48000;
+ return 48000;
+ }
+
+ if (rate > 48000)
+ rate = 48000;
+ if (rate < 4000)
+ rate = 4000;
+
+ /* Power down the ADC */
+ dacp=i810_ac97_get(codec, AC97_POWER_CONTROL);
+ i810_ac97_set(codec, AC97_POWER_CONTROL, dacp|0x0100);
+
+ /* Load the rate and read the effective rate */
+ i810_ac97_set(codec, AC97_PCM_LR_DAC_RATE, rate);
+ rp=i810_ac97_get(codec, AC97_PCM_LR_DAC_RATE);
+
+// printk("ADC rate set to %d Returned %d\n",
+// rate, (int)rp);
+
+ rate=rp;
+
+ /* Power it back up */
+ i810_ac97_set(codec, AC97_POWER_CONTROL, dacp);
+
+ dmabuf->rate = rate;
+#ifdef DEBUG
+ printk("i810_audio: called i810_set_adc_rate : rate = %d\n", rate);
+#endif
+
+ return rate;
+
+}
+
+/* prepare channel attributes for playback */
+static void i810_play_setup(struct i810_state *state)
+{
+// struct dmabuf *dmabuf = &state->dmabuf;
+// struct i810_channel *channel = dmabuf->channel;
+ /* Fixed format. .. */
+ //if (dmabuf->fmt & I810_FMT_16BIT)
+ //if (dmabuf->fmt & I810_FMT_STEREO)
+}
+
+/* prepare channel attributes for recording */
+static void i810_rec_setup(struct i810_state *state)
+{
+// u16 w;
+// struct i810_card *card = state->card;
+// struct dmabuf *dmabuf = &state->dmabuf;
+// struct i810_channel *channel = dmabuf->channel;
+
+ /* Enable AC-97 ADC (capture) */
+// if (dmabuf->fmt & I810_FMT_16BIT) {
+// if (dmabuf->fmt & I810_FMT_STEREO)
+}
+
+
+/* get current playback/recording dma buffer pointer (byte offset from LBA),
+ called with spinlock held! */
+
+extern __inline__ unsigned i810_get_dma_addr(struct i810_state *state)
+{
+ struct dmabuf *dmabuf = &state->dmabuf;
+ u32 offset;
+ struct i810_channel *c = dmabuf->channel;
+
+ if (!dmabuf->enable)
+ return 0;
+ offset = inb(state->card->iobase+c->port+OFF_CIV);
+// offset++;
+ offset&=31;
+ /* Offset has to compensate for the fact we finished the segment
+ on the IRQ so we are at next_segment,0 */
+// printk("BANK%d ", offset);
+ offset *= (dmabuf->dmasize/SG_LEN);
+// printk("DMASZ=%d", dmabuf->dmasize);
+// offset += 1024-(2*inw(state->card->iobase+c->port+OFF_PICB));
+// printk("OFF%d ", offset);
+ return offset;
+}
+
+static void resync_dma_ptrs(struct i810_state *state)
+{
+ struct dmabuf *dmabuf = &state->dmabuf;
+ struct i810_channel *c = dmabuf->channel;
+ int offset;
+
+ offset = inb(state->card->iobase+c->port+OFF_CIV);
+ offset *= (dmabuf->dmasize/SG_LEN);
+
+ dmabuf->hwptr=dmabuf->swptr = offset;
+}
+
+/* Stop recording (lock held) */
+extern __inline__ void __stop_adc(struct i810_state *state)
+{
+ struct dmabuf *dmabuf = &state->dmabuf;
+ struct i810_card *card = state->card;
+
+ dmabuf->enable &= ~ADC_RUNNING;
+ outb(0, card->iobase + PI_CR);
+}
+
+static void stop_adc(struct i810_state *state)
+{
+ struct i810_card *card = state->card;
+ unsigned long flags;
+
+ spin_lock_irqsave(&card->lock, flags);
+ __stop_adc(state);
+ spin_unlock_irqrestore(&card->lock, flags);
+}
+
+static void start_adc(struct i810_state *state)
+{
+ struct dmabuf *dmabuf = &state->dmabuf;
+ struct i810_card *card = state->card;
+ unsigned long flags;
+
+ spin_lock_irqsave(&card->lock, flags);
+ if ((dmabuf->mapped || dmabuf->count < (signed)dmabuf->dmasize) && dmabuf->ready) {
+ dmabuf->enable |= ADC_RUNNING;
+ outb((1<<4) | 1<<2 | 1, card->iobase + PI_CR);
+ }
+ spin_unlock_irqrestore(&card->lock, flags);
+}
+
+/* stop playback (lock held) */
+extern __inline__ void __stop_dac(struct i810_state *state)
+{
+ struct dmabuf *dmabuf = &state->dmabuf;
+ struct i810_card *card = state->card;
+
+ dmabuf->enable &= ~DAC_RUNNING;
+ outb(0, card->iobase + PO_CR);
+}
+
+static void stop_dac(struct i810_state *state)
+{
+ struct i810_card *card = state->card;
+ unsigned long flags;
+
+ spin_lock_irqsave(&card->lock, flags);
+ __stop_dac(state);
+ spin_unlock_irqrestore(&card->lock, flags);
+}
+
+static void start_dac(struct i810_state *state)
+{
+ struct dmabuf *dmabuf = &state->dmabuf;
+ struct i810_card *card = state->card;
+ unsigned long flags;
+
+ spin_lock_irqsave(&card->lock, flags);
+ if ((dmabuf->mapped || dmabuf->count > 0) && dmabuf->ready) {
+ if(!(dmabuf->enable&DAC_RUNNING))
+ {
+ dmabuf->enable |= DAC_RUNNING;
+ outb((1<<4) | 1<<2 | 1, card->iobase + PO_CR);
+ }
+ }
+ spin_unlock_irqrestore(&card->lock, flags);
+}
+
+#define DMABUF_DEFAULTORDER (15-PAGE_SHIFT)
+#define DMABUF_MINORDER 1
+
+/* allocate DMA buffer, playback and recording buffer should be allocated seperately */
+static int alloc_dmabuf(struct i810_state *state)
+{
+ struct dmabuf *dmabuf = &state->dmabuf;
+ void *rawbuf = NULL;
+ int order;
+ unsigned long map, mapend;
+
+ /* alloc as big a chunk as we can */
+ for (order = DMABUF_DEFAULTORDER; order >= DMABUF_MINORDER; order--)
+ if((rawbuf = (void *)__get_free_pages(GFP_KERNEL|GFP_DMA, order)))
+ break;
+
+ if (!rawbuf)
+ return -ENOMEM;
+
+#ifdef DEBUG
+ printk("i810_audio: allocated %ld (order = %d) bytes at %p\n",
+ PAGE_SIZE << order, order, rawbuf);
+#endif
+
+ dmabuf->ready = dmabuf->mapped = 0;
+ dmabuf->rawbuf = rawbuf;
+ dmabuf->buforder = order;
+
+ /* now mark the pages as reserved; otherwise remap_page_range doesn't do what we want */
+ mapend = MAP_NR(rawbuf + (PAGE_SIZE << order) - 1);
+ for (map = MAP_NR(rawbuf); map <= mapend; map++)
+ set_bit(PG_reserved, &mem_map[map].flags);
+
+ return 0;
+}
+
+/* free DMA buffer */
+static void dealloc_dmabuf(struct i810_state *state)
+{
+ struct dmabuf *dmabuf = &state->dmabuf;
+ unsigned long map, mapend;
+
+ if (dmabuf->rawbuf) {
+ /* undo marking the pages as reserved */
+ mapend = MAP_NR(dmabuf->rawbuf + (PAGE_SIZE << dmabuf->buforder) - 1);
+ for (map = MAP_NR(dmabuf->rawbuf); map <= mapend; map++)
+ clear_bit(PG_reserved, &mem_map[map].flags);
+ free_pages((unsigned long)dmabuf->rawbuf,dmabuf->buforder);
+ }
+ dmabuf->rawbuf = NULL;
+ dmabuf->mapped = dmabuf->ready = 0;
+}
+
+static int prog_dmabuf(struct i810_state *state, unsigned rec)
+{
+ struct dmabuf *dmabuf = &state->dmabuf;
+ struct sg_item *sg;
+ unsigned bytepersec;
+ unsigned bufsize;
+ unsigned long flags;
+ int ret;
+ unsigned fragsize;
+ int i;
+
+ spin_lock_irqsave(&state->card->lock, flags);
+ resync_dma_ptrs(state);
+ dmabuf->total_bytes = 0;
+ dmabuf->count = dmabuf->error = 0;
+ spin_unlock_irqrestore(&state->card->lock, flags);
+
+ /* allocate DMA buffer if not allocated yet */
+ if (!dmabuf->rawbuf)
+ if ((ret = alloc_dmabuf(state)))
+ return ret;
+
+ /* FIXME: figure out all this OSS fragment stuff */
+ bytepersec = dmabuf->rate << sample_shift[dmabuf->fmt];
+ bufsize = PAGE_SIZE << dmabuf->buforder;
+ if (dmabuf->ossfragshift) {
+ if ((1000 << dmabuf->ossfragshift) < bytepersec)
+ dmabuf->fragshift = ld2(bytepersec/1000);
+ else
+ dmabuf->fragshift = dmabuf->ossfragshift;
+ } else {
+ /* lets hand out reasonable big ass buffers by default */
+ dmabuf->fragshift = (dmabuf->buforder + PAGE_SHIFT -2);
+ }
+ dmabuf->numfrag = bufsize >> dmabuf->fragshift;
+ while (dmabuf->numfrag < 4 && dmabuf->fragshift > 3) {
+ dmabuf->fragshift--;
+ dmabuf->numfrag = bufsize >> dmabuf->fragshift;
+ }
+ dmabuf->fragsize = 1 << dmabuf->fragshift;
+ if (dmabuf->ossmaxfrags >= 4 && dmabuf->ossmaxfrags < dmabuf->numfrag)
+ dmabuf->numfrag = dmabuf->ossmaxfrags;
+ dmabuf->fragsamples = dmabuf->fragsize >> sample_shift[dmabuf->fmt];
+ dmabuf->dmasize = dmabuf->numfrag << dmabuf->fragshift;
+
+ memset(dmabuf->rawbuf, (dmabuf->fmt & I810_FMT_16BIT) ? 0 : 0x80,
+ dmabuf->dmasize);
+
+ /*
+ * Now set up the ring
+ */
+
+ sg=&dmabuf->channel->sg[0];
+ fragsize = bufsize / SG_LEN;
+
+ /*
+ * Load up 32 sg entries and take an interrupt at each
+ * step (we might want less interrupts later..)
+ */
+
+ for(i=0;i<32;i++)
+ {
+ sg->busaddr=virt_to_bus(dmabuf->rawbuf+fragsize*i);
+ sg->control=(fragsize>>1);
+ sg->control|=CON_IOC;
+ sg++;
+ }
+ spin_lock_irqsave(&state->card->lock, flags);
+ outl(virt_to_bus(&dmabuf->channel->sg[0]), state->card->iobase+dmabuf->channel->port+OFF_BDBAR);
+ outb(16, state->card->iobase+dmabuf->channel->port+OFF_LVI);
+ outb(0, state->card->iobase+dmabuf->channel->port+OFF_CIV);
+ if (rec) {
+ i810_rec_setup(state);
+ } else {
+ i810_play_setup(state);
+ }
+ spin_unlock_irqrestore(&state->card->lock, flags);
+
+ /* set the ready flag for the dma buffer */
+ dmabuf->ready = 1;
+
+#ifdef DEBUG
+ printk("i810_audio: prog_dmabuf, sample rate = %d, format = %d, numfrag = %d, "
+ "fragsize = %d dmasize = %d\n",
+ dmabuf->rate, dmabuf->fmt, dmabuf->numfrag,
+ dmabuf->fragsize, dmabuf->dmasize);
+#endif
+
+ return 0;
+}
+
+/* we are doing quantum mechanics here, the buffer can only be empty, half or full filled i.e.
+ |------------|------------| or |xxxxxxxxxxxx|------------| or |xxxxxxxxxxxx|xxxxxxxxxxxx|
+ but we almost always get this
+ |xxxxxx------|------------| or |xxxxxxxxxxxx|xxxxx-------|
+ so we have to clear the tail space to "silence"
+ |xxxxxx000000|------------| or |xxxxxxxxxxxx|xxxxxx000000|
+*/
+static void i810_clear_tail(struct i810_state *state)
+{
+ struct dmabuf *dmabuf = &state->dmabuf;
+ unsigned swptr;
+ unsigned char silence = (dmabuf->fmt & I810_FMT_16BIT) ? 0 : 0x80;
+ unsigned int len;
+ unsigned long flags;
+
+ spin_lock_irqsave(&state->card->lock, flags);
+ swptr = dmabuf->swptr;
+ spin_unlock_irqrestore(&state->card->lock, flags);
+
+ if (swptr == 0 || swptr == dmabuf->dmasize / 2 || swptr == dmabuf->dmasize)
+ return;
+
+ if (swptr < dmabuf->dmasize/2)
+ len = dmabuf->dmasize/2 - swptr;
+ else
+ len = dmabuf->dmasize - swptr;
+
+ memset(dmabuf->rawbuf + swptr, silence, len);
+
+ spin_lock_irqsave(&state->card->lock, flags);
+ dmabuf->swptr += len;
+ dmabuf->count += len;
+ spin_unlock_irqrestore(&state->card->lock, flags);
+
+ /* restart the dma machine in case it is halted */
+ start_dac(state);
+}
+
+static int drain_dac(struct i810_state *state, int nonblock)
+{
+ struct wait_queue wait = {current, NULL};
+ struct dmabuf *dmabuf = &state->dmabuf;
+ unsigned long flags;
+ unsigned long tmo;
+ int count;
+
+ if (dmabuf->mapped || !dmabuf->ready)
+ return 0;
+
+ add_wait_queue(&dmabuf->wait, &wait);
+ for (;;) {
+ /* It seems that we have to set the current state to TASK_INTERRUPTIBLE
+ every time to make the process really go to sleep */
+ current->state = TASK_INTERRUPTIBLE;
+
+ spin_lock_irqsave(&state->card->lock, flags);
+ count = dmabuf->count;
+ spin_unlock_irqrestore(&state->card->lock, flags);
+
+ if (count <= 0)
+ break;
+
+ if (signal_pending(current))
+ break;
+
+ if (nonblock) {
+ remove_wait_queue(&dmabuf->wait, &wait);
+ current->state = TASK_RUNNING;
+ return -EBUSY;
+ }
+
+ tmo = (dmabuf->dmasize * HZ) / dmabuf->rate;
+ tmo >>= sample_shift[dmabuf->fmt];
+ if (!schedule_timeout(tmo ? tmo : 1) && tmo){
+ printk(KERN_ERR "i810_audio: drain_dac, dma timeout?\n");
+ break;
+ }
+ }
+ remove_wait_queue(&dmabuf->wait, &wait);
+ current->state = TASK_RUNNING;
+ if (signal_pending(current))
+ return -ERESTARTSYS;
+
+ return 0;
+}
+
+/* update buffer manangement pointers, especially, dmabuf->count and dmabuf->hwptr */
+static void i810_update_ptr(struct i810_state *state)
+{
+ struct dmabuf *dmabuf = &state->dmabuf;
+ unsigned hwptr, swptr;
+ int clear_cnt = 0;
+ int diff;
+ unsigned char silence;
+// unsigned half_dmasize;
+
+ /* update hardware pointer */
+ hwptr = i810_get_dma_addr(state);
+ diff = (dmabuf->dmasize + hwptr - dmabuf->hwptr) % dmabuf->dmasize;
+// printk("HWP %d,%d,%d\n", hwptr, dmabuf->hwptr, diff);
+ dmabuf->hwptr = hwptr;
+ dmabuf->total_bytes += diff;
+
+ /* error handling and process wake up for DAC */
+ if (dmabuf->enable == ADC_RUNNING) {
+ if (dmabuf->mapped) {
+ dmabuf->count -= diff;
+ if (dmabuf->count >= (signed)dmabuf->fragsize)
+ wake_up(&dmabuf->wait);
+ } else {
+ dmabuf->count += diff;
+
+ if (dmabuf->count < 0 || dmabuf->count > dmabuf->dmasize) {
+ /* buffer underrun or buffer overrun, we have no way to recover
+ it here, just stop the machine and let the process force hwptr
+ and swptr to sync */
+ __stop_adc(state);
+ dmabuf->error++;
+ }
+ else if (!dmabuf->endcleared) {
+ swptr = dmabuf->swptr;
+ silence = (dmabuf->fmt & I810_FMT_16BIT ? 0 : 0x80);
+ if (dmabuf->count < (signed) dmabuf->fragsize)
+ {
+ clear_cnt = dmabuf->fragsize;
+ if ((swptr + clear_cnt) > dmabuf->dmasize)
+ clear_cnt = dmabuf->dmasize - swptr;
+ memset (dmabuf->rawbuf + swptr, silence, clear_cnt);
+ dmabuf->endcleared = 1;
+ }
+ }
+ wake_up(&dmabuf->wait);
+ }
+ }
+ /* error handling and process wake up for DAC */
+ if (dmabuf->enable == DAC_RUNNING) {
+ if (dmabuf->mapped) {
+ dmabuf->count += diff;
+ if (dmabuf->count >= (signed)dmabuf->fragsize)
+ wake_up(&dmabuf->wait);
+ } else {
+ dmabuf->count -= diff;
+
+ if (dmabuf->count < 0 || dmabuf->count > dmabuf->dmasize) {
+ /* buffer underrun or buffer overrun, we have no way to recover
+ it here, just stop the machine and let the process force hwptr
+ and swptr to sync */
+ __stop_dac(state);
+// printk("DMA overrun on send\n");
+ dmabuf->error++;
+ }
+ wake_up(&dmabuf->wait);
+ }
+ }
+}
+
+static void i810_channel_interrupt(struct i810_card *card)
+{
+ int i;
+
+// printk("CHANNEL IRQ .. ");
+ for(i=0;i<NR_HW_CH;i++)
+ {
+ struct i810_state *state = card->states[i];
+ struct i810_channel *c;
+ unsigned long port = card->iobase;
+ u16 status;
+
+ if(!state)
+ continue;
+ if(!state->dmabuf.ready)
+ continue;
+ c=state->dmabuf.channel;
+
+ port+=c->port;
+
+// printk("PORT %lX (", port);
+
+ status = inw(port + OFF_SR);
+
+// printk("ST%d ", status);
+
+ if(status & DMA_INT_LVI)
+ {
+ /* Back to the start */
+// printk("LVI - STOP");
+ outb((inb(port+OFF_CIV)-1)&31, port+OFF_LVI);
+ i810_update_ptr(state);
+ outb(0, port + OFF_CR);
+ }
+ if(status & DMA_INT_COMPLETE)
+ {
+ int x;
+ /* Keep the card chasing its tail */
+ outb(x=((inb(port+OFF_CIV)-1)&31), port+OFF_LVI);
+ i810_update_ptr(state);
+// printk("COMP%d ",x);
+ }
+// printk(")");
+ outw(status & DMA_INT_MASK, port + OFF_SR);
+ }
+// printk("\n");
+}
+
+static void i810_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+ struct i810_card *card = (struct i810_card *)dev_id;
+ u32 status;
+
+ spin_lock(&card->lock);
+
+ status = inl(card->iobase + GLOB_STA);
+ if(!(status & INT_MASK))
+ {
+ spin_unlock(&card->lock);
+ return; /* not for us */
+ }
+
+// printk("Interrupt %X: ", status);
+ if(status & (INT_PO|INT_PI|INT_MC))
+ i810_channel_interrupt(card);
+
+ /* clear 'em */
+ outl(status & INT_MASK, card->iobase + GLOB_STA);
+ spin_unlock(&card->lock);
+}
+
+static loff_t i810_llseek(struct file *file, loff_t offset, int origin)
+{
+ return -ESPIPE;
+}
+
+/* in this loop, dmabuf.count signifies the amount of data that is waiting to be copied to
+ the user's buffer. it is filled by the dma machine and drained by this loop. */
+static ssize_t i810_read(struct file *file, char *buffer, size_t count, loff_t *ppos)
+{
+ struct i810_state *state = (struct i810_state *)file->private_data;
+ struct dmabuf *dmabuf = &state->dmabuf;
+ ssize_t ret;
+ unsigned long flags;
+ unsigned swptr;
+ int cnt;
+
+#ifdef DEBUG
+ printk("i810_audio: i810_read called, count = %d\n", count);
+#endif
+
+ if (ppos != &file->f_pos)
+ return -ESPIPE;
+ if (dmabuf->mapped)
+ return -ENXIO;
+ if (!dmabuf->ready && (ret = prog_dmabuf(state, 1)))
+ return ret;
+ if (!access_ok(VERIFY_WRITE, buffer, count))
+ return -EFAULT;
+ ret = 0;
+
+ while (count > 0) {
+ spin_lock_irqsave(&state->card->lock, flags);
+ if (dmabuf->count > (signed) dmabuf->dmasize) {
+ /* buffer overrun, we are recovering from sleep_on_timeout,
+ resync hwptr and swptr, make process flush the buffer */
+ dmabuf->count = dmabuf->dmasize;
+ dmabuf->swptr = dmabuf->hwptr;
+ }
+ swptr = dmabuf->swptr;
+ cnt = dmabuf->dmasize - swptr;
+ if (dmabuf->count < cnt)
+ cnt = dmabuf->count;
+ spin_unlock_irqrestore(&state->card->lock, flags);
+
+ if (cnt > count)
+ cnt = count;
+ if (cnt <= 0) {
+ unsigned long tmo;
+ /* buffer is empty, start the dma machine and wait for data to be
+ recorded */
+ start_adc(state);
+ if (file->f_flags & O_NONBLOCK) {
+ if (!ret) ret = -EAGAIN;
+ return ret;
+ }
+ /* This isnt strictly right for the 810 but it'll do */
+ tmo = (dmabuf->dmasize * HZ) / (dmabuf->rate * 2);
+ tmo >>= sample_shift[dmabuf->fmt];
+ /* There are two situations when sleep_on_timeout returns, one is when
+ the interrupt is serviced correctly and the process is waked up by
+ ISR ON TIME. Another is when timeout is expired, which means that
+ either interrupt is NOT serviced correctly (pending interrupt) or it
+ is TOO LATE for the process to be scheduled to run (scheduler latency)
+ which results in a (potential) buffer overrun. And worse, there is
+ NOTHING we can do to prevent it. */
+ if (!interruptible_sleep_on_timeout(&dmabuf->wait, tmo)) {
+#ifdef DEBUG
+ printk(KERN_ERR "i810_audio: recording schedule timeout, "
+ "dmasz %u fragsz %u count %i hwptr %u swptr %u\n",
+ dmabuf->dmasize, dmabuf->fragsize, dmabuf->count,
+ dmabuf->hwptr, dmabuf->swptr);
+#endif
+ /* a buffer overrun, we delay the recovery untill next time the
+ while loop begin and we REALLY have space to record */
+ }
+ if (signal_pending(current)) {
+ ret = ret ? ret : -ERESTARTSYS;
+ return ret;
+ }
+ continue;
+ }
+
+ if (copy_to_user(buffer, dmabuf->rawbuf + swptr, cnt)) {
+ if (!ret) ret = -EFAULT;
+ return ret;
+ }
+
+ swptr = (swptr + cnt) % dmabuf->dmasize;
+
+ spin_lock_irqsave(&state->card->lock, flags);
+ dmabuf->swptr = swptr;
+ dmabuf->count -= cnt;
+ spin_unlock_irqrestore(&state->card->lock, flags);
+
+ count -= cnt;
+ buffer += cnt;
+ ret += cnt;
+ start_adc(state);
+ }
+ return ret;
+}
+
+/* in this loop, dmabuf.count signifies the amount of data that is waiting to be dma to
+ the soundcard. it is drained by the dma machine and filled by this loop. */
+static ssize_t i810_write(struct file *file, const char *buffer, size_t count, loff_t *ppos)
+{
+ struct i810_state *state = (struct i810_state *)file->private_data;
+ struct dmabuf *dmabuf = &state->dmabuf;
+ ssize_t ret;
+ unsigned long flags;
+ unsigned swptr;
+ int cnt;
+
+#ifdef DEBUG
+ printk("i810_audio: i810_write called, count = %d\n", count);
+#endif
+
+ if (ppos != &file->f_pos)
+ return -ESPIPE;
+ if (dmabuf->mapped)
+ return -ENXIO;
+ if (!dmabuf->ready && (ret = prog_dmabuf(state, 0)))
+ return ret;
+ if (!access_ok(VERIFY_READ, buffer, count))
+ return -EFAULT;
+ ret = 0;
+
+ while (count > 0) {
+ spin_lock_irqsave(&state->card->lock, flags);
+ if (dmabuf->count < 0) {
+ /* buffer underrun, we are recovering from sleep_on_timeout,
+ resync hwptr and swptr */
+ dmabuf->count = 0;
+ dmabuf->swptr = dmabuf->hwptr;
+ }
+ swptr = dmabuf->swptr;
+ cnt = dmabuf->dmasize - swptr;
+ if (dmabuf->count + cnt > dmabuf->dmasize)
+ cnt = dmabuf->dmasize - dmabuf->count;
+ spin_unlock_irqrestore(&state->card->lock, flags);
+
+ if (cnt > count)
+ cnt = count;
+ if (cnt <= 0) {
+ unsigned long tmo;
+ /* buffer is full, start the dma machine and wait for data to be
+ played */
+ start_dac(state);
+ if (file->f_flags & O_NONBLOCK) {
+ if (!ret) ret = -EAGAIN;
+ return ret;
+ }
+ /* Not strictly correct but works */
+ tmo = (dmabuf->dmasize * HZ) / (dmabuf->rate * 2);
+ tmo >>= sample_shift[dmabuf->fmt];
+ /* There are two situations when sleep_on_timeout returns, one is when
+ the interrupt is serviced correctly and the process is waked up by
+ ISR ON TIME. Another is when timeout is expired, which means that
+ either interrupt is NOT serviced correctly (pending interrupt) or it
+ is TOO LATE for the process to be scheduled to run (scheduler latency)
+ which results in a (potential) buffer underrun. And worse, there is
+ NOTHING we can do to prevent it. */
+ if (!interruptible_sleep_on_timeout(&dmabuf->wait, tmo)) {
+#ifdef DEBUG
+ printk(KERN_ERR "i810_audio: playback schedule timeout, "
+ "dmasz %u fragsz %u count %i hwptr %u swptr %u\n",
+ dmabuf->dmasize, dmabuf->fragsize, dmabuf->count,
+ dmabuf->hwptr, dmabuf->swptr);
+#endif
+ /* a buffer underrun, we delay the recovery untill next time the
+ while loop begin and we REALLY have data to play */
+ }
+ if (signal_pending(current)) {
+ if (!ret) ret = -ERESTARTSYS;
+ return ret;
+ }
+ continue;
+ }
+ if (copy_from_user(dmabuf->rawbuf + swptr, buffer, cnt)) {
+ if (!ret) ret = -EFAULT;
+ return ret;
+ }
+
+ swptr = (swptr + cnt) % dmabuf->dmasize;
+
+ spin_lock_irqsave(&state->card->lock, flags);
+ dmabuf->swptr = swptr;
+ dmabuf->count += cnt;
+ dmabuf->endcleared = 0;
+ spin_unlock_irqrestore(&state->card->lock, flags);
+
+ count -= cnt;
+ buffer += cnt;
+ ret += cnt;
+ start_dac(state);
+ }
+ return ret;
+}
+
+static unsigned int i810_poll(struct file *file, struct poll_table_struct *wait)
+{
+ struct i810_state *state = (struct i810_state *)file->private_data;
+ struct dmabuf *dmabuf = &state->dmabuf;
+ unsigned long flags;
+ unsigned int mask = 0;
+
+ if (file->f_mode & FMODE_WRITE)
+ poll_wait(file, &dmabuf->wait, wait);
+ if (file->f_mode & FMODE_READ)
+ poll_wait(file, &dmabuf->wait, wait);
+
+ spin_lock_irqsave(&state->card->lock, flags);
+ i810_update_ptr(state);
+ if (file->f_mode & FMODE_READ) {
+ if (dmabuf->count >= (signed)dmabuf->fragsize)
+ mask |= POLLIN | POLLRDNORM;
+ }
+ if (file->f_mode & FMODE_WRITE) {
+ if (dmabuf->mapped) {
+ if (dmabuf->count >= (signed)dmabuf->fragsize)
+ mask |= POLLOUT | POLLWRNORM;
+ } else {
+ if ((signed)dmabuf->dmasize >= dmabuf->count + (signed)dmabuf->fragsize)
+ mask |= POLLOUT | POLLWRNORM;
+ }
+ }
+ spin_unlock_irqrestore(&state->card->lock, flags);
+
+ return mask;
+}
+
+static int i810_mmap(struct file *file, struct vm_area_struct *vma)
+{
+ struct i810_state *state = (struct i810_state *)file->private_data;
+ struct dmabuf *dmabuf = &state->dmabuf;
+ int ret;
+ unsigned long size;
+
+ if (vma->vm_flags & VM_WRITE) {
+ if ((ret = prog_dmabuf(state, 0)) != 0)
+ return ret;
+ } else if (vma->vm_flags & VM_READ) {
+ if ((ret = prog_dmabuf(state, 1)) != 0)
+ return ret;
+ } else
+ return -EINVAL;
+
+ if (vma->vm_offset != 0)
+ return -EINVAL;
+ size = vma->vm_end - vma->vm_start;
+ if (size > (PAGE_SIZE << dmabuf->buforder))
+ return -EINVAL;
+ if (remap_page_range(vma->vm_start, virt_to_phys(dmabuf->rawbuf),
+ size, vma->vm_page_prot))
+ return -EAGAIN;
+ dmabuf->mapped = 1;
+
+ return 0;
+}
+
+static int i810_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
+{
+ struct i810_state *state = (struct i810_state *)file->private_data;
+ struct dmabuf *dmabuf = &state->dmabuf;
+ unsigned long flags;
+ audio_buf_info abinfo;
+ count_info cinfo;
+ int val, mapped, ret;
+
+ mapped = ((file->f_mode & FMODE_WRITE) && dmabuf->mapped) ||
+ ((file->f_mode & FMODE_READ) && dmabuf->mapped);
+#ifdef DEBUG
+ printk("i810_audio: i810_ioctl, command = %2d, arg = 0x%08x\n",
+ _IOC_NR(cmd), arg ? *(int *)arg : 0);
+#endif
+
+ switch (cmd)
+ {
+ case OSS_GETVERSION:
+ return put_user(SOUND_VERSION, (int *)arg);
+
+ case SNDCTL_DSP_RESET:
+ /* FIXME: spin_lock ? */
+ if (file->f_mode & FMODE_WRITE) {
+ stop_dac(state);
+ synchronize_irq();
+ dmabuf->ready = 0;
+ resync_dma_ptrs(state);
+ dmabuf->swptr = dmabuf->hwptr = 0;
+ dmabuf->count = dmabuf->total_bytes = 0;
+ }
+ if (file->f_mode & FMODE_READ) {
+ stop_adc(state);
+ synchronize_irq();
+ resync_dma_ptrs(state);
+ dmabuf->ready = 0;
+ dmabuf->swptr = dmabuf->hwptr = 0;
+ dmabuf->count = dmabuf->total_bytes = 0;
+ }
+ return 0;
+
+ case SNDCTL_DSP_SYNC:
+ if (file->f_mode & FMODE_WRITE)
+ return drain_dac(state, file->f_flags & O_NONBLOCK);
+ return 0;
+
+ case SNDCTL_DSP_SPEED: /* set smaple rate */
+ get_user_ret(val, (int *)arg, -EFAULT);
+ if (val >= 0) {
+ if (file->f_mode & FMODE_WRITE) {
+ stop_dac(state);
+ dmabuf->ready = 0;
+ spin_lock_irqsave(&state->card->lock, flags);
+ i810_set_dac_rate(state, val);
+ spin_unlock_irqrestore(&state->card->lock, flags);
+ }
+ if (file->f_mode & FMODE_READ) {
+ stop_adc(state);
+ dmabuf->ready = 0;
+ spin_lock_irqsave(&state->card->lock, flags);
+ i810_set_adc_rate(state, val);
+ spin_unlock_irqrestore(&state->card->lock, flags);
+ }
+ }
+ return put_user(dmabuf->rate, (int *)arg);
+
+ case SNDCTL_DSP_STEREO: /* set stereo or mono channel */
+ get_user_ret(val, (int *)arg, -EFAULT);
+ if(val==0)
+ return -EINVAL;
+ if (file->f_mode & FMODE_WRITE) {
+ stop_dac(state);
+ dmabuf->ready = 0;
+ dmabuf->fmt = I810_FMT_STEREO;
+ }
+ if (file->f_mode & FMODE_READ) {
+ stop_adc(state);
+ dmabuf->ready = 0;
+ dmabuf->fmt = I810_FMT_STEREO;
+ }
+ return 0;
+
+ case SNDCTL_DSP_GETBLKSIZE:
+ if (file->f_mode & FMODE_WRITE) {
+ if ((val = prog_dmabuf(state, 0)))
+ return val;
+ return put_user(dmabuf->fragsize, (int *)arg);
+ }
+ if (file->f_mode & FMODE_READ) {
+ if ((val = prog_dmabuf(state, 1)))
+ return val;
+ return put_user(dmabuf->fragsize, (int *)arg);
+ }
+
+ case SNDCTL_DSP_GETFMTS: /* Returns a mask of supported sample format*/
+ return put_user(AFMT_S16_LE, (int *)arg);
+
+ case SNDCTL_DSP_SETFMT: /* Select sample format */
+ get_user_ret(val, (int *)arg, -EFAULT);
+ if (val != AFMT_QUERY) {
+ if (file->f_mode & FMODE_WRITE) {
+ stop_dac(state);
+ dmabuf->ready = 0;
+ }
+ if (file->f_mode & FMODE_READ) {
+ stop_adc(state);
+ dmabuf->ready = 0;
+ }
+ }
+ return put_user(AFMT_S16_LE, (int *)arg);
+
+ case SNDCTL_DSP_CHANNELS:
+ get_user_ret(val, (int *)arg, -EFAULT);
+ if (val != 0) {
+ if (file->f_mode & FMODE_WRITE) {
+ stop_dac(state);
+ dmabuf->ready = 0;
+ }
+ if (file->f_mode & FMODE_READ) {
+ stop_adc(state);
+ dmabuf->ready = 0;
+ }
+ }
+ return put_user(2, (int *)arg);
+
+ case SNDCTL_DSP_POST:
+ /* FIXME: the same as RESET ?? */
+ return 0;
+
+ case SNDCTL_DSP_SUBDIVIDE:
+ if (dmabuf->subdivision)
+ return -EINVAL;
+ get_user_ret(val, (int *)arg, -EFAULT);
+ if (val != 1 && val != 2 && val != 4)
+ return -EINVAL;
+ dmabuf->subdivision = val;
+ return 0;
+
+ case SNDCTL_DSP_SETFRAGMENT:
+ get_user_ret(val, (int *)arg, -EFAULT);
+
+ dmabuf->ossfragshift = val & 0xffff;
+ dmabuf->ossmaxfrags = (val >> 16) & 0xffff;
+ if (dmabuf->ossfragshift < 4)
+ dmabuf->ossfragshift = 4;
+ if (dmabuf->ossfragshift > 15)
+ dmabuf->ossfragshift = 15;
+ if (dmabuf->ossmaxfrags < 4)
+ dmabuf->ossmaxfrags = 4;
+
+ return 0;
+
+ case SNDCTL_DSP_GETOSPACE:
+ if (!(file->f_mode & FMODE_WRITE))
+ return -EINVAL;
+ if (!dmabuf->enable && (val = prog_dmabuf(state, 0)) != 0)
+ return val;
+ spin_lock_irqsave(&state->card->lock, flags);
+ i810_update_ptr(state);
+ abinfo.fragsize = dmabuf->fragsize;
+ abinfo.bytes = dmabuf->dmasize - dmabuf->count;
+ abinfo.fragstotal = dmabuf->numfrag;
+ abinfo.fragments = abinfo.bytes >> dmabuf->fragshift;
+ spin_unlock_irqrestore(&state->card->lock, flags);
+ return copy_to_user((void *)arg, &abinfo, sizeof(abinfo)) ? -EFAULT : 0;
+
+ case SNDCTL_DSP_GETISPACE:
+ if (!(file->f_mode & FMODE_READ))
+ return -EINVAL;
+ if (!dmabuf->enable && (val = prog_dmabuf(state, 1)) != 0)
+ return val;
+ spin_lock_irqsave(&state->card->lock, flags);
+ i810_update_ptr(state);
+ abinfo.fragsize = dmabuf->fragsize;
+ abinfo.bytes = dmabuf->count;
+ abinfo.fragstotal = dmabuf->numfrag;
+ abinfo.fragments = abinfo.bytes >> dmabuf->fragshift;
+ spin_unlock_irqrestore(&state->card->lock, flags);
+ return copy_to_user((void *)arg, &abinfo, sizeof(abinfo)) ? -EFAULT : 0;
+
+ case SNDCTL_DSP_NONBLOCK:
+ file->f_flags |= O_NONBLOCK;
+ return 0;
+
+ case SNDCTL_DSP_GETCAPS:
+ return put_user(DSP_CAP_REALTIME|DSP_CAP_TRIGGER|DSP_CAP_MMAP,
+ (int *)arg);
+
+ case SNDCTL_DSP_GETTRIGGER:
+ val = 0;
+ if (file->f_mode & FMODE_READ && dmabuf->enable)
+ val |= PCM_ENABLE_INPUT;
+ if (file->f_mode & FMODE_WRITE && dmabuf->enable)
+ val |= PCM_ENABLE_OUTPUT;
+ return put_user(val, (int *)arg);
+
+ case SNDCTL_DSP_SETTRIGGER:
+ get_user_ret(val, (int *)arg, -EFAULT);
+ if (file->f_mode & FMODE_READ) {
+ if (val & PCM_ENABLE_INPUT) {
+ if (!dmabuf->ready && (ret = prog_dmabuf(state, 1)))
+ return ret;
+ start_adc(state);
+ } else
+ stop_adc(state);
+ }
+ if (file->f_mode & FMODE_WRITE) {
+ if (val & PCM_ENABLE_OUTPUT) {
+ if (!dmabuf->ready && (ret = prog_dmabuf(state, 0)))
+ return ret;
+ start_dac(state);
+ } else
+ stop_dac(state);
+ }
+ return 0;
+
+ case SNDCTL_DSP_GETIPTR:
+ if (!(file->f_mode & FMODE_READ))
+ return -EINVAL;
+ spin_lock_irqsave(&state->card->lock, flags);
+ i810_update_ptr(state);
+ cinfo.bytes = dmabuf->total_bytes;
+ cinfo.blocks = dmabuf->count >> dmabuf->fragshift;
+ cinfo.ptr = dmabuf->hwptr;
+ if (dmabuf->mapped)
+ dmabuf->count &= dmabuf->fragsize-1;
+ spin_unlock_irqrestore(&state->card->lock, flags);
+ return copy_to_user((void *)arg, &cinfo, sizeof(cinfo));
+
+ case SNDCTL_DSP_GETOPTR:
+ if (!(file->f_mode & FMODE_WRITE))
+ return -EINVAL;
+ spin_lock_irqsave(&state->card->lock, flags);
+ i810_update_ptr(state);
+ cinfo.bytes = dmabuf->total_bytes;
+ cinfo.blocks = dmabuf->count >> dmabuf->fragshift;
+ cinfo.ptr = dmabuf->hwptr;
+ if (dmabuf->mapped)
+ dmabuf->count &= dmabuf->fragsize-1;
+ spin_unlock_irqrestore(&state->card->lock, flags);
+ return copy_to_user((void *)arg, &cinfo, sizeof(cinfo));
+
+ case SNDCTL_DSP_SETDUPLEX:
+ return -EINVAL;
+
+ case SNDCTL_DSP_GETODELAY:
+ if (!(file->f_mode & FMODE_WRITE))
+ return -EINVAL;
+ spin_lock_irqsave(&state->card->lock, flags);
+ i810_update_ptr(state);
+ val = dmabuf->count;
+ spin_unlock_irqrestore(&state->card->lock, flags);
+ return put_user(val, (int *)arg);
+
+ case SOUND_PCM_READ_RATE:
+ return put_user(dmabuf->rate, (int *)arg);
+
+ case SOUND_PCM_READ_CHANNELS:
+ return put_user((dmabuf->fmt & I810_FMT_STEREO) ? 2 : 1,
+ (int *)arg);
+
+ case SOUND_PCM_READ_BITS:
+ return put_user(AFMT_S16_LE, (int *)arg);
+
+ case SNDCTL_DSP_MAPINBUF:
+ case SNDCTL_DSP_MAPOUTBUF:
+ case SNDCTL_DSP_SETSYNCRO:
+ case SOUND_PCM_WRITE_FILTER:
+ case SOUND_PCM_READ_FILTER:
+ return -EINVAL;
+ }
+ return -EINVAL;
+}
+
+static int i810_open(struct inode *inode, struct file *file)
+{
+ int i = 0;
+ int minor = MINOR(inode->i_rdev);
+ struct i810_card *card = devs;
+ struct i810_state *state = NULL;
+ struct dmabuf *dmabuf = NULL;
+
+ /* find an avaiable virtual channel (instance of /dev/dsp) */
+ while (card != NULL) {
+ for (i = 0; i < NR_HW_CH; i++) {
+ if (card->states[i] == NULL) {
+ state = card->states[i] = (struct i810_state *)
+ kmalloc(sizeof(struct i810_state), GFP_KERNEL);
+ if (state == NULL)
+ return -ENOMEM;
+ memset(state, 0, sizeof(struct i810_state));
+ dmabuf = &state->dmabuf;
+ goto found_virt;
+ }
+ }
+ card = card->next;
+ }
+ /* no more virtual channel avaiable */
+ if (!state)
+ return -ENODEV;
+
+ found_virt:
+ /* found a free virtual channel, allocate hardware channels */
+ if(file->f_mode & FMODE_READ)
+ dmabuf->channel = card->alloc_rec_pcm_channel(card);
+ else
+ dmabuf->channel = card->alloc_pcm_channel(card);
+
+ if (dmabuf->channel == NULL) {
+ kfree (card->states[i]);
+ card->states[i] = NULL;;
+ return -ENODEV;
+ }
+
+ /* initialize the virtual channel */
+ state->virt = i;
+ state->card = card;
+ state->magic = I810_STATE_MAGIC;
+ dmabuf->wait = NULL;
+ state->open_sem = MUTEX;
+ file->private_data = state;
+
+ down(&state->open_sem);
+
+ /* set default sample format. According to OSS Programmer's Guide /dev/dsp
+ should be default to unsigned 8-bits, mono, with sample rate 8kHz and
+ /dev/dspW will accept 16-bits sample */
+ if (file->f_mode & FMODE_WRITE) {
+ dmabuf->fmt &= ~I810_FMT_MASK;
+ dmabuf->fmt |= I810_FMT_16BIT;
+ dmabuf->ossfragshift = 0;
+ dmabuf->ossmaxfrags = 0;
+ dmabuf->subdivision = 0;
+ i810_set_dac_rate(state, 48000);
+ }
+
+ if (file->f_mode & FMODE_READ) {
+ dmabuf->fmt &= ~I810_FMT_MASK;
+ dmabuf->fmt |= I810_FMT_16BIT;
+ dmabuf->ossfragshift = 0;
+ dmabuf->ossmaxfrags = 0;
+ dmabuf->subdivision = 0;
+ i810_set_adc_rate(state, 48000);
+ }
+
+ state->open_mode |= file->f_mode & (FMODE_READ | FMODE_WRITE);
+ up(&state->open_sem);
+
+ MOD_INC_USE_COUNT;
+ return 0;
+}
+
+static int i810_release(struct inode *inode, struct file *file)
+{
+ struct i810_state *state = (struct i810_state *)file->private_data;
+ struct dmabuf *dmabuf = &state->dmabuf;
+
+ if (file->f_mode & FMODE_WRITE) {
+ /* FIXME :.. */
+ i810_clear_tail(state);
+ drain_dac(state, file->f_flags & O_NONBLOCK);
+ }
+
+ /* stop DMA state machine and free DMA buffers/channels */
+ down(&state->open_sem);
+
+ if (file->f_mode & FMODE_WRITE) {
+ stop_dac(state);
+ dealloc_dmabuf(state);
+ state->card->free_pcm_channel(state->card, dmabuf->channel->num);
+ }
+ if (file->f_mode & FMODE_READ) {
+ stop_adc(state);
+ dealloc_dmabuf(state);
+ state->card->free_pcm_channel(state->card, dmabuf->channel->num);
+ }
+
+ kfree(state->card->states[state->virt]);
+ state->card->states[state->virt] = NULL;
+ state->open_mode &= (~file->f_mode) & (FMODE_READ|FMODE_WRITE);
+
+ /* we're covered by the open_sem */
+ up(&state->open_sem);
+
+ MOD_DEC_USE_COUNT;
+ return 0;
+}
+
+static /*const*/ struct file_operations i810_audio_fops = {
+ llseek: i810_llseek,
+ read: i810_read,
+ write: i810_write,
+ poll: i810_poll,
+ ioctl: i810_ioctl,
+ mmap: i810_mmap,
+ open: i810_open,
+ release: i810_release,
+};
+
+/* Write AC97 codec registers */
+
+static u16 i810_ac97_get(struct ac97_codec *dev, u8 reg)
+{
+ struct i810_card *card = dev->private_data;
+ int count = 100;
+
+ while(count-- && (inb(card->iobase + CAS) & 1))
+ udelay(1);
+ return inw(card->ac97base + (reg&0x7f));
+}
+
+static void i810_ac97_set(struct ac97_codec *dev, u8 reg, u16 data)
+{
+ struct i810_card *card = dev->private_data;
+ int count = 100;
+
+ while(count-- && (inb(card->iobase + CAS) & 1))
+ udelay(1);
+ outw(data, card->ac97base + (reg&0x7f));
+}
+
+
+/* OSS /dev/mixer file operation methods */
+
+static int i810_open_mixdev(struct inode *inode, struct file *file)
+{
+ int i;
+ int minor = MINOR(inode->i_rdev);
+ struct i810_card *card = devs;
+
+ for (card = devs; card != NULL; card = card->next)
+ for (i = 0; i < NR_AC97; i++)
+ if (card->ac97_codec[i] != NULL &&
+ card->ac97_codec[i]->dev_mixer == minor)
+ goto match;
+
+ if (!card)
+ return -ENODEV;
+
+ match:
+ file->private_data = card->ac97_codec[i];
+
+ MOD_INC_USE_COUNT;
+ return 0;
+}
+
+static int i810_release_mixdev(struct inode *inode, struct file *file)
+{
+ MOD_DEC_USE_COUNT;
+ return 0;
+}
+
+static int i810_ioctl_mixdev(struct inode *inode, struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ struct ac97_codec *codec = (struct ac97_codec *)file->private_data;
+
+ return codec->mixer_ioctl(codec, cmd, arg);
+}
+
+static /*const*/ struct file_operations i810_mixer_fops = {
+ llseek: i810_llseek,
+ ioctl: i810_ioctl_mixdev,
+ open: i810_open_mixdev,
+ release: i810_release_mixdev,
+};
+
+/* AC97 codec initialisation. */
+static int __init i810_ac97_init(struct i810_card *card)
+{
+ int num_ac97 = 0;
+ int ready_2nd = 0;
+ struct ac97_codec *codec;
+ u16 eid;
+
+ outl(0, card->iobase + GLOB_CNT);
+ udelay(500);
+ outl(1<<1, card->iobase + GLOB_CNT);
+
+ for (num_ac97 = 0; num_ac97 < NR_AC97; num_ac97++) {
+ if ((codec = kmalloc(sizeof(struct ac97_codec), GFP_KERNEL)) == NULL)
+ return -ENOMEM;
+ memset(codec, 0, sizeof(struct ac97_codec));
+
+ /* initialize some basic codec information, other fields will be filled
+ in ac97_probe_codec */
+ codec->private_data = card;
+ codec->id = num_ac97;
+
+ codec->codec_read = i810_ac97_get;
+ codec->codec_write = i810_ac97_set;
+
+ if (ac97_probe_codec(codec) == 0)
+ break;
+
+ eid = i810_ac97_get(codec, AC97_EXTENDED_ID);
+
+ if(eid==0xFFFFFF)
+ {
+ printk(KERN_WARNING "i810_audio: no codec attached ?\n");
+ kfree(codec);
+ break;
+ }
+
+ card->ac97_features = eid;
+
+ if(!(eid&0x0001))
+ printk(KERN_WARNING "i810_audio: only 48Khz playback available.\n");
+ else
+ /* Enable variable rate mode */
+ i810_ac97_set(codec, AC97_EXTENDED_STATUS,
+ i810_ac97_get(codec,AC97_EXTENDED_STATUS)|1);
+
+ if ((codec->dev_mixer = register_sound_mixer(&i810_mixer_fops, -1)) < 0) {
+ printk(KERN_ERR "i810_audio: couldn't register mixer!\n");
+ kfree(codec);
+ break;
+ }
+
+ /* Now check the codec for useful features to make up for
+ the dumbness of the 810 hardware engine */
+
+ card->ac97_codec[num_ac97] = codec;
+
+ /* if there is no secondary codec at all, don't probe any more */
+ if (!ready_2nd)
+ return num_ac97+1;
+ }
+ return num_ac97;
+}
+
+/* install the driver, we do not allocate hardware channel nor DMA buffer now, they are defered
+ untill "ACCESS" time (in prog_dmabuf called by open/read/write/ioctl/mmap) */
+
+static int __init i810_install(struct pci_dev *pci_dev, int type, char *name)
+{
+ struct i810_card *card;
+
+ if ((card = kmalloc(sizeof(struct i810_card), GFP_KERNEL)) == NULL) {
+ printk(KERN_ERR "i810_audio: out of memory\n");
+ return -ENOMEM;
+ }
+ memset(card, 0, sizeof(*card));
+
+ card->iobase = pci_dev->base_address[1]&PCI_BASE_ADDRESS_IO_MASK;
+ card->ac97base = pci_dev->base_address[0]&PCI_BASE_ADDRESS_IO_MASK;
+ card->pci_dev = pci_dev;
+ card->pci_id = type;
+ card->irq = pci_dev->irq;
+ card->next = devs;
+ card->magic = I810_CARD_MAGIC;
+ spin_lock_init(&card->lock);
+ devs = card;
+
+ pci_set_master(pci_dev);
+
+ printk(KERN_INFO "i810: %s found at IO 0x%04lx and 0x%04lx, IRQ %d\n",
+ name, card->iobase, card->ac97base, card->irq);
+
+ card->alloc_pcm_channel = i810_alloc_pcm_channel;
+ card->alloc_rec_pcm_channel = i810_alloc_rec_pcm_channel;
+ card->free_pcm_channel = i810_free_pcm_channel;
+
+ /* claim our iospace and irq */
+ request_region(card->iobase, 64, name);
+ request_region(card->ac97base, 256, name);
+
+ if (request_irq(card->irq, &i810_interrupt, SA_SHIRQ, name, card)) {
+ printk(KERN_ERR "i810_audio: unable to allocate irq %d\n", card->irq);
+ release_region(card->iobase, 64);
+ release_region(card->ac97base, 256);
+ kfree(card);
+ return -ENODEV;
+ }
+ /* register /dev/dsp */
+ if ((card->dev_audio = register_sound_dsp(&i810_audio_fops, -1)) < 0) {
+ printk(KERN_ERR "i810_audio: couldn't register DSP device!\n");
+ release_region(card->iobase, 64);
+ release_region(card->ac97base, 256);
+ free_irq(card->irq, card);
+ kfree(card);
+ return -ENODEV;
+ }
+
+
+ /* initialize AC97 codec and register /dev/mixer */
+ if (i810_ac97_init(card) <= 0) {
+ unregister_sound_dsp(card->dev_audio);
+ release_region(card->iobase, 64);
+ release_region(card->ac97base, 256);
+ free_irq(card->irq, card);
+ kfree(card);
+ return -ENODEV;
+ }
+
+// printk("resetting codec?\n");
+ outl(0, card->iobase + GLOB_CNT);
+ udelay(500);
+// printk("bringing it back?\n");
+ outl(1<<1, card->iobase + GLOB_CNT);
+ return 0;
+}
+
+static void i810_remove(struct i810_card *card)
+{
+ int i;
+ /* free hardware resources */
+ free_irq(card->irq, card);
+ release_region(card->iobase, 64);
+ release_region(card->ac97base, 256);
+
+ /* unregister audio devices */
+ for (i = 0; i < NR_AC97; i++)
+ if (card->ac97_codec[i] != NULL) {
+ unregister_sound_mixer(card->ac97_codec[i]->dev_mixer);
+ kfree (card->ac97_codec[i]);
+ }
+ unregister_sound_dsp(card->dev_audio);
+ kfree(card);
+}
+
+MODULE_AUTHOR("Assorted");
+MODULE_DESCRIPTION("Intel 810 audio support");
+
+int __init i810_probe(void)
+{
+ struct pci_dev *pcidev = NULL;
+ int foundone=0;
+
+ if (!pci_present()) /* No PCI bus in this machine! */
+ return -ENODEV;
+
+ printk(KERN_INFO "Intel 810 + AC97 Audio, version "
+ DRIVER_VERSION ", " __TIME__ " " __DATE__ "\n");
+
+ while( (pcidev = pci_find_device(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82801, pcidev))!=NULL ) {
+ if (i810_install(pcidev, ICH82801AA, "Intel ICH 82801AA")==0)
+ foundone++;
+ }
+ while( (pcidev = pci_find_device(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82901, pcidev))!=NULL ) {
+ if (i810_install(pcidev, ICH82901AB, "Intel ICH 82901AB")==0)
+ foundone++;
+ }
+ while( (pcidev = pci_find_device(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_440MX, pcidev))!=NULL ) {
+ if (i810_install(pcidev, INTEL440MX, "Intel 440MX")==0)
+ foundone++;
+ }
+
+ printk(KERN_INFO "i810_audio: Found %d audio device(s).\n",
+ foundone);
+ return foundone;
+}
+
+#ifdef MODULE
+
+int init_module(void)
+{
+ if(i810_probe()==0)
+ printk(KERN_ERR "i810_audio: No devices found.\n");
+ return 0;
+}
+
+void cleanup_module (void)
+{
+ struct i810_card *next;
+ while(devs)
+ {
+ next=devs->next;
+ i810_remove(devs);
+ devs=next;
+ }
+}
+
+#endif
\ No newline at end of file
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)