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Diffstat (limited to 'sound/oss/au1000.c')
| -rw-r--r-- | sound/oss/au1000.c | 2214 |
1 files changed, 2214 insertions, 0 deletions
diff --git a/sound/oss/au1000.c b/sound/oss/au1000.c new file mode 100644 index 00000000000..4491733c9e4 --- /dev/null +++ b/sound/oss/au1000.c @@ -0,0 +1,2214 @@ +/* + * au1000.c -- Sound driver for Alchemy Au1000 MIPS Internet Edge + * Processor. + * + * Copyright 2001 MontaVista Software Inc. + * Author: MontaVista Software, Inc. + * stevel@mvista.com or source@mvista.com + * + * 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 SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN + * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF + * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON + * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * 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. + * + * + * Module command line parameters: + * + * Supported devices: + * /dev/dsp standard OSS /dev/dsp device + * /dev/mixer standard OSS /dev/mixer device + * + * Notes: + * + * 1. Much of the OSS buffer allocation, ioctl's, and mmap'ing are + * taken, slightly modified or not at all, from the ES1371 driver, + * so refer to the credits in es1371.c for those. The rest of the + * code (probe, open, read, write, the ISR, etc.) is new. + * + * Revision history + * 06.27.2001 Initial version + * 03.20.2002 Added mutex locks around read/write methods, to prevent + * simultaneous access on SMP or preemptible kernels. Also + * removed the counter/pointer fragment aligning at the end + * of read/write methods [stevel]. + * 03.21.2002 Add support for coherent DMA on the audio read/write DMA + * channels [stevel]. + * + */ +#include <linux/module.h> +#include <linux/string.h> +#include <linux/ioport.h> +#include <linux/sched.h> +#include <linux/delay.h> +#include <linux/sound.h> +#include <linux/slab.h> +#include <linux/soundcard.h> +#include <linux/init.h> +#include <linux/page-flags.h> +#include <linux/poll.h> +#include <linux/pci.h> +#include <linux/bitops.h> +#include <linux/proc_fs.h> +#include <linux/spinlock.h> +#include <linux/smp_lock.h> +#include <linux/ac97_codec.h> +#include <linux/interrupt.h> +#include <asm/io.h> +#include <asm/uaccess.h> +#include <asm/mach-au1x00/au1000.h> +#include <asm/mach-au1x00/au1000_dma.h> + +/* --------------------------------------------------------------------- */ + +#undef OSS_DOCUMENTED_MIXER_SEMANTICS +#undef AU1000_DEBUG +#undef AU1000_VERBOSE_DEBUG + +#define AU1000_MODULE_NAME "Au1000 audio" +#define PFX AU1000_MODULE_NAME + +#ifdef AU1000_DEBUG +#define dbg(format, arg...) printk(KERN_DEBUG PFX ": " format "\n" , ## arg) +#else +#define dbg(format, arg...) do {} while (0) +#endif +#define err(format, arg...) printk(KERN_ERR PFX ": " format "\n" , ## arg) +#define info(format, arg...) printk(KERN_INFO PFX ": " format "\n" , ## arg) +#define warn(format, arg...) printk(KERN_WARNING PFX ": " format "\n" , ## arg) + + +/* misc stuff */ +#define POLL_COUNT 0x5000 +#define AC97_EXT_DACS (AC97_EXTID_SDAC | AC97_EXTID_CDAC | AC97_EXTID_LDAC) + +/* Boot options */ +static int vra = 0; // 0 = no VRA, 1 = use VRA if codec supports it +MODULE_PARM(vra, "i"); +MODULE_PARM_DESC(vra, "if 1 use VRA if codec supports it"); + + +/* --------------------------------------------------------------------- */ + +struct au1000_state { + /* soundcore stuff */ + int dev_audio; + +#ifdef AU1000_DEBUG + /* debug /proc entry */ + struct proc_dir_entry *ps; + struct proc_dir_entry *ac97_ps; +#endif /* AU1000_DEBUG */ + + struct ac97_codec codec; + unsigned codec_base_caps;// AC'97 reg 00h, "Reset Register" + unsigned codec_ext_caps; // AC'97 reg 28h, "Extended Audio ID" + int no_vra; // do not use VRA + + spinlock_t lock; + struct semaphore open_sem; + struct semaphore sem; + mode_t open_mode; + wait_queue_head_t open_wait; + + struct dmabuf { + unsigned int dmanr; // DMA Channel number + unsigned sample_rate; // Hz + unsigned src_factor; // SRC interp/decimation (no vra) + unsigned sample_size; // 8 or 16 + int num_channels; // 1 = mono, 2 = stereo, 4, 6 + int dma_bytes_per_sample;// DMA bytes per audio sample frame + int user_bytes_per_sample;// User bytes per audio sample frame + int cnt_factor; // user-to-DMA bytes per audio + // sample frame + void *rawbuf; + dma_addr_t dmaaddr; + unsigned buforder; + unsigned numfrag; // # of DMA fragments in DMA buffer + unsigned fragshift; + void *nextIn; // ptr to next-in to DMA buffer + void *nextOut;// ptr to next-out from DMA buffer + int count; // current byte count in DMA buffer + unsigned total_bytes; // total bytes written or read + unsigned error; // over/underrun + wait_queue_head_t wait; + /* redundant, but makes calculations easier */ + unsigned fragsize; // user perception of fragment size + unsigned dma_fragsize; // DMA (real) fragment size + unsigned dmasize; // Total DMA buffer size + // (mult. of DMA fragsize) + /* OSS stuff */ + unsigned mapped:1; + unsigned ready:1; + unsigned stopped:1; + unsigned ossfragshift; + int ossmaxfrags; + unsigned subdivision; + } dma_dac , dma_adc; +} au1000_state; + +/* --------------------------------------------------------------------- */ + + +static 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 void au1000_delay(int msec) +{ + unsigned long tmo; + signed long tmo2; + + if (in_interrupt()) + return; + + tmo = jiffies + (msec * HZ) / 1000; + for (;;) { + tmo2 = tmo - jiffies; + if (tmo2 <= 0) + break; + schedule_timeout(tmo2); + } +} + + +/* --------------------------------------------------------------------- */ + +static u16 rdcodec(struct ac97_codec *codec, u8 addr) +{ + struct au1000_state *s = (struct au1000_state *)codec->private_data; + unsigned long flags; + u32 cmd; + u16 data; + int i; + + spin_lock_irqsave(&s->lock, flags); + + for (i = 0; i < POLL_COUNT; i++) + if (!(au_readl(AC97C_STATUS) & AC97C_CP)) + break; + if (i == POLL_COUNT) + err("rdcodec: codec cmd pending expired!"); + + cmd = (u32) addr & AC97C_INDEX_MASK; + cmd |= AC97C_READ; // read command + au_writel(cmd, AC97C_CMD); + + /* now wait for the data */ + for (i = 0; i < POLL_COUNT; i++) + if (!(au_readl(AC97C_STATUS) & AC97C_CP)) + break; + if (i == POLL_COUNT) { + err("rdcodec: read poll expired!"); + return 0; + } + + data = au_readl(AC97C_CMD) & 0xffff; + + spin_unlock_irqrestore(&s->lock, flags); + + return data; +} + + +static void wrcodec(struct ac97_codec *codec, u8 addr, u16 data) +{ + struct au1000_state *s = (struct au1000_state *)codec->private_data; + unsigned long flags; + u32 cmd; + int i; + + spin_lock_irqsave(&s->lock, flags); + + for (i = 0; i < POLL_COUNT; i++) + if (!(au_readl(AC97C_STATUS) & AC97C_CP)) + break; + if (i == POLL_COUNT) + err("wrcodec: codec cmd pending expired!"); + + cmd = (u32) addr & AC97C_INDEX_MASK; + cmd &= ~AC97C_READ; // write command + cmd |= ((u32) data << AC97C_WD_BIT); // OR in the data word + au_writel(cmd, AC97C_CMD); + + spin_unlock_irqrestore(&s->lock, flags); +} + +static void waitcodec(struct ac97_codec *codec) +{ + u16 temp; + int i; + + /* codec_wait is used to wait for a ready state after + an AC97C_RESET. */ + au1000_delay(10); + + // first poll the CODEC_READY tag bit + for (i = 0; i < POLL_COUNT; i++) + if (au_readl(AC97C_STATUS) & AC97C_READY) + break; + if (i == POLL_COUNT) { + err("waitcodec: CODEC_READY poll expired!"); + return; + } + // get AC'97 powerdown control/status register + temp = rdcodec(codec, AC97_POWER_CONTROL); + + // If anything is powered down, power'em up + if (temp & 0x7f00) { + // Power on + wrcodec(codec, AC97_POWER_CONTROL, 0); + au1000_delay(100); + // Reread + temp = rdcodec(codec, AC97_POWER_CONTROL); + } + + // Check if Codec REF,ANL,DAC,ADC ready + if ((temp & 0x7f0f) != 0x000f) + err("codec reg 26 status (0x%x) not ready!!", temp); +} + + +/* --------------------------------------------------------------------- */ + +/* stop the ADC before calling */ +static void set_adc_rate(struct au1000_state *s, unsigned rate) +{ + struct dmabuf *adc = &s->dma_adc; + struct dmabuf *dac = &s->dma_dac; + unsigned adc_rate, dac_rate; + u16 ac97_extstat; + + if (s->no_vra) { + // calc SRC factor + adc->src_factor = ((96000 / rate) + 1) >> 1; + adc->sample_rate = 48000 / adc->src_factor; + return; + } + + adc->src_factor = 1; + + ac97_extstat = rdcodec(&s->codec, AC97_EXTENDED_STATUS); + + rate = rate > 48000 ? 48000 : rate; + + // enable VRA + wrcodec(&s->codec, AC97_EXTENDED_STATUS, + ac97_extstat | AC97_EXTSTAT_VRA); + // now write the sample rate + wrcodec(&s->codec, AC97_PCM_LR_ADC_RATE, (u16) rate); + // read it back for actual supported rate + adc_rate = rdcodec(&s->codec, AC97_PCM_LR_ADC_RATE); + +#ifdef AU1000_VERBOSE_DEBUG + dbg("%s: set to %d Hz", __FUNCTION__, adc_rate); +#endif + + // some codec's don't allow unequal DAC and ADC rates, in which case + // writing one rate reg actually changes both. + dac_rate = rdcodec(&s->codec, AC97_PCM_FRONT_DAC_RATE); + if (dac->num_channels > 2) + wrcodec(&s->codec, AC97_PCM_SURR_DAC_RATE, dac_rate); + if (dac->num_channels > 4) + wrcodec(&s->codec, AC97_PCM_LFE_DAC_RATE, dac_rate); + + adc->sample_rate = adc_rate; + dac->sample_rate = dac_rate; +} + +/* stop the DAC before calling */ +static void set_dac_rate(struct au1000_state *s, unsigned rate) +{ + struct dmabuf *dac = &s->dma_dac; + struct dmabuf *adc = &s->dma_adc; + unsigned adc_rate, dac_rate; + u16 ac97_extstat; + + if (s->no_vra) { + // calc SRC factor + dac->src_factor = ((96000 / rate) + 1) >> 1; + dac->sample_rate = 48000 / dac->src_factor; + return; + } + + dac->src_factor = 1; + + ac97_extstat = rdcodec(&s->codec, AC97_EXTENDED_STATUS); + + rate = rate > 48000 ? 48000 : rate; + + // enable VRA + wrcodec(&s->codec, AC97_EXTENDED_STATUS, + ac97_extstat | AC97_EXTSTAT_VRA); + // now write the sample rate + wrcodec(&s->codec, AC97_PCM_FRONT_DAC_RATE, (u16) rate); + // I don't support different sample rates for multichannel, + // so make these channels the same. + if (dac->num_channels > 2) + wrcodec(&s->codec, AC97_PCM_SURR_DAC_RATE, (u16) rate); + if (dac->num_channels > 4) + wrcodec(&s->codec, AC97_PCM_LFE_DAC_RATE, (u16) rate); + // read it back for actual supported rate + dac_rate = rdcodec(&s->codec, AC97_PCM_FRONT_DAC_RATE); + +#ifdef AU1000_VERBOSE_DEBUG + dbg("%s: set to %d Hz", __FUNCTION__, dac_rate); +#endif + + // some codec's don't allow unequal DAC and ADC rates, in which case + // writing one rate reg actually changes both. + adc_rate = rdcodec(&s->codec, AC97_PCM_LR_ADC_RATE); + + dac->sample_rate = dac_rate; + adc->sample_rate = adc_rate; +} + +static void stop_dac(struct au1000_state *s) +{ + struct dmabuf *db = &s->dma_dac; + unsigned long flags; + + if (db->stopped) + return; + + spin_lock_irqsave(&s->lock, flags); + + disable_dma(db->dmanr); + + db->stopped = 1; + + spin_unlock_irqrestore(&s->lock, flags); +} + +static void stop_adc(struct au1000_state *s) +{ + struct dmabuf *db = &s->dma_adc; + unsigned long flags; + + if (db->stopped) + return; + + spin_lock_irqsave(&s->lock, flags); + + disable_dma(db->dmanr); + + db->stopped = 1; + + spin_unlock_irqrestore(&s->lock, flags); +} + + +static void set_xmit_slots(int num_channels) +{ + u32 ac97_config = au_readl(AC97C_CONFIG) & ~AC97C_XMIT_SLOTS_MASK; + + switch (num_channels) { + case 1: // mono + case 2: // stereo, slots 3,4 + ac97_config |= (0x3 << AC97C_XMIT_SLOTS_BIT); + break; + case 4: // stereo with surround, slots 3,4,7,8 + ac97_config |= (0x33 << AC97C_XMIT_SLOTS_BIT); + break; + case 6: // stereo with surround and center/LFE, slots 3,4,6,7,8,9 + ac97_config |= (0x7b << AC97C_XMIT_SLOTS_BIT); + break; + } + + au_writel(ac97_config, AC97C_CONFIG); +} + +static void set_recv_slots(int num_channels) +{ + u32 ac97_config = au_readl(AC97C_CONFIG) & ~AC97C_RECV_SLOTS_MASK; + + /* + * Always enable slots 3 and 4 (stereo). Slot 6 is + * optional Mic ADC, which I don't support yet. + */ + ac97_config |= (0x3 << AC97C_RECV_SLOTS_BIT); + + au_writel(ac97_config, AC97C_CONFIG); +} + +static void start_dac(struct au1000_state *s) +{ + struct dmabuf *db = &s->dma_dac; + unsigned long flags; + unsigned long buf1, buf2; + + if (!db->stopped) + return; + + spin_lock_irqsave(&s->lock, flags); + + au_readl(AC97C_STATUS); // read status to clear sticky bits + + // reset Buffer 1 and 2 pointers to nextOut and nextOut+dma_fragsize + buf1 = virt_to_phys(db->nextOut); + buf2 = buf1 + db->dma_fragsize; + if (buf2 >= db->dmaaddr + db->dmasize) + buf2 -= db->dmasize; + + set_xmit_slots(db->num_channels); + + init_dma(db->dmanr); + if (get_dma_active_buffer(db->dmanr) == 0) { + clear_dma_done0(db->dmanr); // clear DMA done bit + set_dma_addr0(db->dmanr, buf1); + set_dma_addr1(db->dmanr, buf2); + } else { + clear_dma_done1(db->dmanr); // clear DMA done bit + set_dma_addr1(db->dmanr, buf1); + set_dma_addr0(db->dmanr, buf2); + } + set_dma_count(db->dmanr, db->dma_fragsize>>1); + enable_dma_buffers(db->dmanr); + + start_dma(db->dmanr); + +#ifdef AU1000_VERBOSE_DEBUG + dump_au1000_dma_channel(db->dmanr); +#endif + + db->stopped = 0; + + spin_unlock_irqrestore(&s->lock, flags); +} + +static void start_adc(struct au1000_state *s) +{ + struct dmabuf *db = &s->dma_adc; + unsigned long flags; + unsigned long buf1, buf2; + + if (!db->stopped) + return; + + spin_lock_irqsave(&s->lock, flags); + + au_readl(AC97C_STATUS); // read status to clear sticky bits + + // reset Buffer 1 and 2 pointers to nextIn and nextIn+dma_fragsize + buf1 = virt_to_phys(db->nextIn); + buf2 = buf1 + db->dma_fragsize; + if (buf2 >= db->dmaaddr + db->dmasize) + buf2 -= db->dmasize; + + set_recv_slots(db->num_channels); + + init_dma(db->dmanr); + if (get_dma_active_buffer(db->dmanr) == 0) { + clear_dma_done0(db->dmanr); // clear DMA done bit + set_dma_addr0(db->dmanr, buf1); + set_dma_addr1(db->dmanr, buf2); + } else { + clear_dma_done1(db->dmanr); // clear DMA done bit + set_dma_addr1(db->dmanr, buf1); + set_dma_addr0(db->dmanr, buf2); + } + set_dma_count(db->dmanr, db->dma_fragsize>>1); + enable_dma_buffers(db->dmanr); + + start_dma(db->dmanr); + +#ifdef AU1000_VERBOSE_DEBUG + dump_au1000_dma_channel(db->dmanr); +#endif + + db->stopped = 0; + + spin_unlock_irqrestore(&s->lock, flags); +} + +/* --------------------------------------------------------------------- */ + +#define DMABUF_DEFAULTORDER (17-PAGE_SHIFT) +#define DMABUF_MINORDER 1 + +extern inline void dealloc_dmabuf(struct au1000_state *s, struct dmabuf *db) +{ + struct page *page, *pend; + + if (db->rawbuf) { + /* undo marking the pages as reserved */ + pend = virt_to_page(db->rawbuf + + (PAGE_SIZE << db->buforder) - 1); + for (page = virt_to_page(db->rawbuf); page <= pend; page++) + ClearPageReserved(page); + dma_free_noncoherent(NULL, + PAGE_SIZE << db->buforder, + db->rawbuf, + db->dmaaddr); + } + db->rawbuf = db->nextIn = db->nextOut = NULL; + db->mapped = db->ready = 0; +} + +static int prog_dmabuf(struct au1000_state *s, struct dmabuf *db) +{ + int order; + unsigned user_bytes_per_sec; + unsigned bufs; + struct page *page, *pend; + unsigned rate = db->sample_rate; + + if (!db->rawbuf) { + db->ready = db->mapped = 0; + for (order = DMABUF_DEFAULTORDER; + order >= DMABUF_MINORDER; order--) + if ((db->rawbuf = dma_alloc_noncoherent(NULL, + PAGE_SIZE << order, + &db->dmaaddr, + 0))) + break; + if (!db->rawbuf) + return -ENOMEM; + db->buforder = order; + /* now mark the pages as reserved; + otherwise remap_pfn_range doesn't do what we want */ + pend = virt_to_page(db->rawbuf + + (PAGE_SIZE << db->buforder) - 1); + for (page = virt_to_page(db->rawbuf); page <= pend; page++) + SetPageReserved(page); + } + + db->cnt_factor = 1; + if (db->sample_size == 8) + db->cnt_factor *= 2; + if (db->num_channels == 1) + db->cnt_factor *= 2; + db->cnt_factor *= db->src_factor; + + db->count = 0; + db->nextIn = db->nextOut = db->rawbuf; + + db->user_bytes_per_sample = (db->sample_size>>3) * db->num_channels; + db->dma_bytes_per_sample = 2 * ((db->num_channels == 1) ? + 2 : db->num_channels); + + user_bytes_per_sec = rate * db->user_bytes_per_sample; + bufs = PAGE_SIZE << db->buforder; + if (db->ossfragshift) { + if ((1000 << db->ossfragshift) < user_bytes_per_sec) + db->fragshift = ld2(user_bytes_per_sec/1000); + else + db->fragshift = db->ossfragshift; + } else { + db->fragshift = ld2(user_bytes_per_sec / 100 / + (db->subdivision ? db->subdivision : 1)); + if (db->fragshift < 3) + db->fragshift = 3; + } + + db->fragsize = 1 << db->fragshift; + db->dma_fragsize = db->fragsize * db->cnt_factor; + db->numfrag = bufs / db->dma_fragsize; + + while (db->numfrag < 4 && db->fragshift > 3) { + db->fragshift--; + db->fragsize = 1 << db->fragshift; + db->dma_fragsize = db->fragsize * db->cnt_factor; + db->numfrag = bufs / db->dma_fragsize; + } + + if (db->ossmaxfrags >= 4 && db->ossmaxfrags < db->numfrag) + db->numfrag = db->ossmaxfrags; + + db->dmasize = db->dma_fragsize * db->numfrag; + memset(db->rawbuf, 0, bufs); + +#ifdef AU1000_VERBOSE_DEBUG + dbg("rate=%d, samplesize=%d, channels=%d", + rate, db->sample_size, db->num_channels); + dbg("fragsize=%d, cnt_factor=%d, dma_fragsize=%d", + db->fragsize, db->cnt_factor, db->dma_fragsize); + dbg("numfrag=%d, dmasize=%d", db->numfrag, db->dmasize); +#endif + + db->ready = 1; + return 0; +} + +extern inline int prog_dmabuf_adc(struct au1000_state *s) +{ + stop_adc(s); + return prog_dmabuf(s, &s->dma_adc); + +} + +extern inline int prog_dmabuf_dac(struct au1000_state *s) +{ + stop_dac(s); + return prog_dmabuf(s, &s->dma_dac); +} + + +/* hold spinlock for the following */ +static irqreturn_t dac_dma_interrupt(int irq, void *dev_id, struct pt_regs *regs) +{ + struct au1000_state *s = (struct au1000_state *) dev_id; + struct dmabuf *dac = &s->dma_dac; + unsigned long newptr; + u32 ac97c_stat, buff_done; + + ac97c_stat = au_readl(AC97C_STATUS); +#ifdef AU1000_VERBOSE_DEBUG + if (ac97c_stat & (AC97C_XU | AC97C_XO | AC97C_TE)) + dbg("AC97C status = 0x%08x", ac97c_stat); +#endif + + if ((buff_done = get_dma_buffer_done(dac->dmanr)) == 0) { + /* fastpath out, to ease interrupt sharing */ + return IRQ_HANDLED; + } + + spin_lock(&s->lock); + + if (buff_done != (DMA_D0 | DMA_D1)) { + dac->nextOut += dac->dma_fragsize; + if (dac->nextOut >= dac->rawbuf + dac->dmasize) + dac->nextOut -= dac->dmasize; + + /* update playback pointers */ + newptr = virt_to_phys(dac->nextOut) + dac->dma_fragsize; + if (newptr >= dac->dmaaddr + dac->dmasize) + newptr -= dac->dmasize; + + dac->count -= dac->dma_fragsize; + dac->total_bytes += dac->dma_fragsize; + + if (dac->count <= 0) { +#ifdef AU1000_VERBOSE_DEBUG + dbg("dac underrun"); +#endif + spin_unlock(&s->lock); + stop_dac(s); + spin_lock(&s->lock); + dac->count = 0; + dac->nextIn = dac->nextOut; + } else if (buff_done == DMA_D0) { + clear_dma_done0(dac->dmanr); // clear DMA done bit + set_dma_count0(dac->dmanr, dac->dma_fragsize>>1); + set_dma_addr0(dac->dmanr, newptr); + enable_dma_buffer0(dac->dmanr); // reenable + } else { + clear_dma_done1(dac->dmanr); // clear DMA done bit + set_dma_count1(dac->dmanr, dac->dma_fragsize>>1); + set_dma_addr1(dac->dmanr, newptr); + enable_dma_buffer1(dac->dmanr); // reenable + } + } else { + // both done bits set, we missed an interrupt + spin_unlock(&s->lock); + stop_dac(s); + spin_lock(&s->lock); + + dac->nextOut += 2*dac->dma_fragsize; + if (dac->nextOut >= dac->rawbuf + dac->dmasize) + dac->nextOut -= dac->dmasize; + + dac->count -= 2*dac->dma_fragsize; + dac->total_bytes += 2*dac->dma_fragsize; + + if (dac->count > 0) { + spin_unlock(&s->lock); + start_dac(s); + spin_lock(&s->lock); + } + } + + /* wake up anybody listening */ + if (waitqueue_active(&dac->wait)) + wake_up(&dac->wait); + + spin_unlock(&s->lock); + + return IRQ_HANDLED; +} + + +static irqreturn_t adc_dma_interrupt(int irq, void *dev_id, struct pt_regs *regs) +{ + struct au1000_state *s = (struct au1000_state *) dev_id; + struct dmabuf *adc = &s->dma_adc; + unsigned long newptr; + u32 ac97c_stat, buff_done; + + ac97c_stat = au_readl(AC97C_STATUS); +#ifdef AU1000_VERBOSE_DEBUG + if (ac97c_stat & (AC97C_RU | AC97C_RO)) + dbg("AC97C status = 0x%08x", ac97c_stat); +#endif + + if ((buff_done = get_dma_buffer_done(adc->dmanr)) == 0) { + /* fastpath out, to ease interrupt sharing */ + return IRQ_HANDLED; + } + + spin_lock(&s->lock); + + if (buff_done != (DMA_D0 | DMA_D1)) { + if (adc->count + adc->dma_fragsize > adc->dmasize) { + // Overrun. Stop ADC and log the error + spin_unlock(&s->lock); + stop_adc(s); + adc->error++; + err("adc overrun"); + return IRQ_NONE; + } + + adc->nextIn += adc->dma_fragsize; + if (adc->nextIn >= adc->rawbuf + adc->dmasize) + adc->nextIn -= adc->dmasize; + + /* update capture pointers */ + newptr = virt_to_phys(adc->nextIn) + adc->dma_fragsize; + if (newptr >= adc->dmaaddr + adc->dmasize) + newptr -= adc->dmasize; + + adc->count += adc->dma_fragsize; + adc->total_bytes += adc->dma_fragsize; + + if (buff_done == DMA_D0) { + clear_dma_done0(adc->dmanr); // clear DMA done bit + set_dma_count0(adc->dmanr, adc->dma_fragsize>>1); + set_dma_addr0(adc->dmanr, newptr); + enable_dma_buffer0(adc->dmanr); // reenable + } else { + clear_dma_done1(adc->dmanr); // clear DMA done bit + set_dma_count1(adc->dmanr, adc->dma_fragsize>>1); + set_dma_addr1(adc->dmanr, newptr); + enable_dma_buffer1(adc->dmanr); // reenable + } + } else { + // both done bits set, we missed an interrupt + spin_unlock(&s->lock); + stop_adc(s); + spin_lock(&s->lock); + + if (adc->count + 2*adc->dma_fragsize > adc->dmasize) { + // Overrun. Log the error + adc->error++; + err("adc overrun"); + spin_unlock(&s->lock); + return IRQ_NONE; + } + + adc->nextIn += 2*adc->dma_fragsize; + if (adc->nextIn >= adc->rawbuf + adc->dmasize) + adc->nextIn -= adc->dmasize; + + adc->count += 2*adc->dma_fragsize; + adc->total_bytes += 2*adc->dma_fragsize; + + spin_unlock(&s->lock); + start_adc(s); + spin_lock(&s->lock); + } + + /* wake up anybody listening */ + if (waitqueue_active(&adc->wait)) + wake_up(&adc->wait); + + spin_unlock(&s->lock); + + return IRQ_HANDLED; +} + +/* --------------------------------------------------------------------- */ + +static loff_t au1000_llseek(struct file *file, loff_t offset, int origin) +{ + return -ESPIPE; +} + + +static int au1000_open_mixdev(struct inode *inode, struct file *file) +{ + file->private_data = &au1000_state; + return nonseekable_open(inode, file); +} + +static int au1000_release_mixdev(struct inode *inode, struct file *file) +{ + return 0; +} + +static int mixdev_ioctl(struct ac97_codec *codec, unsigned int cmd, + unsigned long arg) +{ + return codec->mixer_ioctl(codec, cmd, arg); +} + +static int au1000_ioctl_mixdev(struct inode *inode, struct file *file, + unsigned int cmd, unsigned long arg) +{ + struct au1000_state *s = (struct au1000_state *)file->private_data; + struct ac97_codec *codec = &s->codec; + + return mixdev_ioctl(codec, cmd, arg); +} + +static /*const */ struct file_operations au1000_mixer_fops = { + .owner = THIS_MODULE, + .llseek = au1000_llseek, + .ioctl = au1000_ioctl_mixdev, + .open = au1000_open_mixdev, + .release = au1000_release_mixdev, +}; + +/* --------------------------------------------------------------------- */ + +static int drain_dac(struct au1000_state *s, int nonblock) +{ + unsigned long flags; + int count, tmo; + + if (s->dma_dac.mapped || !s->dma_dac.ready || s->dma_dac.stopped) + return 0; + + for (;;) { + spin_lock_irqsave(&s->lock, flags); + count = s->dma_dac.count; + spin_unlock_irqrestore(&s->lock, flags); + if (count <= 0) + break; + if (signal_pending(current)) + break; + if (nonblock) + return -EBUSY; + tmo = 1000 * count / (s->no_vra ? + 48000 : s->dma_dac.sample_rate); + tmo /= s->dma_dac.dma_bytes_per_sample; + au1000_delay(tmo); + } + if (signal_pending(current)) + return -ERESTARTSYS; + return 0; +} + +/* --------------------------------------------------------------------- */ + +static inline u8 S16_TO_U8(s16 ch) +{ + return (u8) (ch >> 8) + 0x80; +} +static inline s16 U8_TO_S16(u8 ch) +{ + return (s16) (ch - 0x80) << 8; +} + +/* + * Translates user samples to dma buffer suitable for AC'97 DAC data: + * If mono, copy left channel to right channel in dma buffer. + * If 8 bit samples, cvt to 16-bit before writing to dma buffer. + * If interpolating (no VRA), duplicate every audio frame src_factor times. + */ +static int translate_from_user(struct dmabuf *db, + char* dmabuf, + char* userbuf, + int dmacount) +{ + int sample, i; + int interp_bytes_per_sample; + int num_samples; + int mono = (db->num_channels == 1); + char usersample[12]; + s16 ch, dmasample[6]; + + if (db->sample_size == 16 && !mono && db->src_factor == 1) { + // no translation necessary, just copy + if (copy_from_user(dmabuf, userbuf, dmacount)) + return -EFAULT; + return dmacount; + } + + interp_bytes_per_sample = db->dma_bytes_per_sample * db->src_factor; + num_samples = dmacount / interp_bytes_per_sample; + + for (sample = 0; sample < num_samples; sample++) { + if (copy_from_user(usersample, userbuf, + db->user_bytes_per_sample)) { + dbg("%s: fault", __FUNCTION__); + return -EFAULT; + } + + for (i = 0; i < db->num_channels; i++) { + if (db->sample_size == 8) + ch = U8_TO_S16(usersample[i]); + else + ch = *((s16 *) (&usersample[i * 2])); + dmasample[i] = ch; + if (mono) + dmasample[i + 1] = ch; // right channel + } + + // duplicate every audio frame src_factor times + for (i = 0; i < db->src_factor; i++) + memcpy(dmabuf, dmasample, db->dma_bytes_per_sample); + + userbuf += db->user_bytes_per_sample; + dmabuf += interp_bytes_per_sample; + } + + return num_samples * interp_bytes_per_sample; +} + +/* + * Translates AC'97 ADC samples to user buffer: + * If mono, send only left channel to user buffer. + * If 8 bit samples, cvt from 16 to 8 bit before writing to user buffer. + * If decimating (no VRA), skip over src_factor audio frames. + */ +static int translate_to_user(struct dmabuf *db, + char* userbuf, + char* dmabuf, + int dmacount) +{ + int sample, i; + int interp_bytes_per_sample; + int num_samples; + int mono = (db->num_channels == 1); + char usersample[12]; + + if (db->sample_size == 16 && !mono && db->src_factor == 1) { + // no translation necessary, just copy + if (copy_to_user(userbuf, dmabuf, dmacount)) + return -EFAULT; + return dmacount; + } + + interp_bytes_per_sample = db->dma_bytes_per_sample * db->src_factor; + num_samples = dmacount / interp_bytes_per_sample; + + for (sample = 0; sample < num_samples; sample++) { + for (i = 0; i < db->num_channels; i++) { + if (db->sample_size == 8) + usersample[i] = + S16_TO_U8(*((s16 *) (&dmabuf[i * 2]))); + else + *((s16 *) (&usersample[i * 2])) = + *((s16 *) (&dmabuf[i * 2])); + } + + if (copy_to_user(userbuf, usersample, + db->user_bytes_per_sample)) { + dbg("%s: fault", __FUNCTION__); + return -EFAULT; + } + + userbuf += db->user_bytes_per_sample; + dmabuf += interp_bytes_per_sample; + } + + return num_samples * interp_bytes_per_sample; +} + +/* + * Copy audio data to/from user buffer from/to dma buffer, taking care + * that we wrap when reading/writing the dma buffer. Returns actual byte + * count written to or read from the dma buffer. + */ +static int copy_dmabuf_user(struct dmabuf *db, char* userbuf, + int count, int to_user) +{ + char *bufptr = to_user ? db->nextOut : db->nextIn; + char *bufend = db->rawbuf + db->dmasize; + int cnt, ret; + + if (bufptr + count > bufend) { + int partial = (int) (bufend - bufptr); + if (to_user) { + if ((cnt = translate_to_user(db, userbuf, + bufptr, partial)) < 0) + return cnt; + ret = cnt; + if ((cnt = translate_to_user(db, userbuf + partial, + db->rawbuf, + count - partial)) < 0) + return cnt; + ret += cnt; + } else { + if ((cnt = translate_from_user(db, bufptr, userbuf, + partial)) < 0) + return cnt; + ret = cnt; + if ((cnt = translate_from_user(db, db->rawbuf, + userbuf + partial, + count - partial)) < 0) + return cnt; + ret += cnt; + } + } else { + if (to_user) + ret = translate_to_user(db, userbuf, bufptr, count); + else + ret = translate_from_user(db, bufptr, userbuf, count); + } + + return ret; +} + + +static ssize_t au1000_read(struct file *file, char *buffer, + size_t count, loff_t *ppos) +{ + struct au1000_state *s = (struct au1000_state *)file->private_data; + struct dmabuf *db = &s->dma_adc; + DECLARE_WAITQUEUE(wait, current); + ssize_t ret; + unsigned long flags; + int cnt, usercnt, avail; + + if (db->mapped) + return -ENXIO; + if (!access_ok(VERIFY_WRITE, buffer, count)) + return -EFAULT; + ret = 0; + + count *= db->cnt_factor; + + down(&s->sem); + add_wait_queue(&db->wait, &wait); + + while (count > 0) { + // wait for samples in ADC dma buffer + do { + if (db->stopped) + start_adc(s); + spin_lock_irqsave(&s->lock, flags); + avail = db->count; + if (avail <= 0) + __set_current_state(TASK_INTERRUPTIBLE); + spin_unlock_irqrestore(&s->lock, flags); + if (avail <= 0) { + if (file->f_flags & O_NONBLOCK) { + if (!ret) + ret = -EAGAIN; + goto out; + } + up(&s->sem); + schedule(); + if (signal_pending(current)) { + if (!ret) + ret = -ERESTARTSYS; + goto out2; + } + down(&s->sem); + } + } while (avail <= 0); + + // copy from nextOut to user + if ((cnt = copy_dmabuf_user(db, buffer, + count > avail ? + avail : count, 1)) < 0) { + if (!ret) + ret = -EFAULT; + goto out; + } + + spin_lock_irqsave(&s->lock, flags); + db->count -= cnt; + db->nextOut += cnt; + if (db->nextOut >= db->rawbuf + db->dmasize) + db->nextOut -= db->dmasize; + spin_unlock_irqrestore(&s->lock, flags); + + count -= cnt; + usercnt = cnt / db->cnt_factor; + buffer += usercnt; + ret += usercnt; + } // while (count > 0) + +out: + up(&s->sem); +out2: + remove_wait_queue(&db->wait, &wait); + set_current_state(TASK_RUNNING); + return ret; +} + +static ssize_t au1000_write(struct file *file, const char *buffer, + size_t count, loff_t * ppos) +{ + struct au1000_state *s = (struct au1000_state *)file->private_data; + struct dmabuf *db = &s->dma_dac; + DECLARE_WAITQUEUE(wait, current); + ssize_t ret = 0; + unsigned long flags; + int cnt, usercnt, avail; + +#ifdef AU1000_VERBOSE_DEBUG + dbg("write: count=%d", count); +#endif + + if (db->mapped) + return -ENXIO; + if (!access_ok(VERIFY_READ, buffer, count)) + return -EFAULT; + + count *= db->cnt_factor; + + down(&s->sem); + add_wait_queue(&db->wait, &wait); + + while (count > 0) { + // wait for space in playback buffer + do { + spin_lock_irqsave(&s->lock, flags); + avail = (int) db->dmasize - db->count; + if (avail <= 0) + __set_current_state(TASK_INTERRUPTIBLE); + spin_unlock_irqrestore(&s->lock, flags); + if (avail <= 0) { + if (file->f_flags & O_NONBLOCK) { + if (!ret) + ret = -EAGAIN; + goto out; + } + up(&s->sem); + schedule(); + if (signal_pending(current)) { + if (!ret) + ret = -ERESTARTSYS; + goto out2; + } + down(&s->sem); + } + } while (avail <= 0); + + // copy from user to nextIn + if ((cnt = copy_dmabuf_user(db, (char *) buffer, + count > avail ? + avail : count, 0)) < 0) { + if (!ret) + ret = -EFAULT; + goto out; + } + + spin_lock_irqsave(&s->lock, flags); + db->count += cnt; + db->nextIn += cnt; + if (db->nextIn >= db->rawbuf + db->dmasize) + db->nextIn -= db->dmasize; + spin_unlock_irqrestore(&s->lock, flags); + if (db->stopped) + start_dac(s); + + count -= cnt; + usercnt = cnt / db->cnt_factor; + buffer += usercnt; + ret += usercnt; + } // while (count > 0) + +out: + up(&s->sem); +out2: + remove_wait_queue(&db->wait, &wait); + set_current_state(TASK_RUNNING); + return ret; +} + + +/* No kernel lock - we have our own spinlock */ +static unsigned int au1000_poll(struct file *file, + struct poll_table_struct *wait) +{ + struct au1000_state *s = (struct au1000_state *)file->private_data; + unsigned long flags; + unsigned int mask = 0; + + if (file->f_mode & FMODE_WRITE) { + if (!s->dma_dac.ready) + return 0; + poll_wait(file, &s->dma_dac.wait, wait); + } + if (file->f_mode & FMODE_READ) { + if (!s->dma_adc.ready) + return 0; + poll_wait(file, &s->dma_adc.wait, wait); + } + + spin_lock_irqsave(&s->lock, flags); + + if (file->f_mode & FMODE_READ) { + if (s->dma_adc.count >= (signed)s->dma_adc.dma_fragsize) + mask |= POLLIN | POLLRDNORM; + } + if (file->f_mode & FMODE_WRITE) { + if (s->dma_dac.mapped) { + if (s->dma_dac.count >= + (signed)s->dma_dac.dma_fragsize) + mask |= POLLOUT | POLLWRNORM; + } else { + if ((signed) s->dma_dac.dmasize >= + s->dma_dac.count + (signed)s->dma_dac.dma_fragsize) + mask |= POLLOUT | POLLWRNORM; + } + } + spin_unlock_irqrestore(&s->lock, flags); + return mask; +} + +static int au1000_mmap(struct file *file, struct vm_area_struct *vma) +{ + struct au1000_state *s = (struct au1000_state *)file->private_data; + struct dmabuf *db; + unsigned long size; + int ret = 0; + + dbg(__FUNCTION__); + + lock_kernel(); + down(&s->sem); + if (vma->vm_flags & VM_WRITE) + db = &s->dma_dac; + else if (vma->vm_flags & VM_READ) + db = &s->dma_adc; + else { + ret = -EINVAL; + goto out; + } + if (vma->vm_pgoff != 0) { + ret = -EINVAL; + goto out; + } + size = vma->vm_end - vma->vm_start; + if (size > (PAGE_SIZE << db->buforder)) { + ret = -EINVAL; + goto out; + } + if (remap_pfn_range(vma, vma->vm_start, virt_to_phys(db->rawbuf), + size, vma->vm_page_prot)) { + ret = -EAGAIN; + goto out; + } + vma->vm_flags &= ~VM_IO; + db->mapped = 1; +out: + up(&s->sem); + unlock_kernel(); + return ret; +} + + +#ifdef AU1000_VERBOSE_DEBUG +static struct ioctl_str_t { + unsigned int cmd; + const char *str; +} ioctl_str[] = { + {SNDCTL_DSP_RESET, "SNDCTL_DSP_RESET"}, + {SNDCTL_DSP_SYNC, "SNDCTL_DSP_SYNC"}, + {SNDCTL_DSP_SPEED, "SNDCTL_DSP_SPEED"}, + {SNDCTL_DSP_STEREO, "SNDCTL_DSP_STEREO"}, + {SNDCTL_DSP_GETBLKSIZE, "SNDCTL_DSP_GETBLKSIZE"}, + {SNDCTL_DSP_SAMPLESIZE, "SNDCTL_DSP_SAMPLESIZE"}, + {SNDCTL_DSP_CHANNELS, "SNDCTL_DSP_CHANNELS"}, + {SOUND_PCM_WRITE_CHANNELS, "SOUND_PCM_WRITE_CHANNELS"}, + {SOUND_PCM_WRITE_FILTER, "SOUND_PCM_WRITE_FILTER"}, + {SNDCTL_DSP_POST, "SNDCTL_DSP_POST"}, + {SNDCTL_DSP_SUBDIVIDE, "SNDCTL_DSP_SUBDIVIDE"}, + {SNDCTL_DSP_SETFRAGMENT, "SNDCTL_DSP_SETFRAGMENT"}, + {SNDCTL_DSP_GETFMTS, "SNDCTL_DSP_GETFMTS"}, + {SNDCTL_DSP_SETFMT, "SNDCTL_DSP_SETFMT"}, + {SNDCTL_DSP_GETOSPACE, "SNDCTL_DSP_GETOSPACE"}, + {SNDCTL_DSP_GETISPACE, "SNDCTL_DSP_GETISPACE"}, + {SNDCTL_DSP_NONBLOCK, "SNDCTL_DSP_NONBLOCK"}, + {SNDCTL_DSP_GETCAPS, "SNDCTL_DSP_GETCAPS"}, + {SNDCTL_DSP_GETTRIGGER, "SNDCTL_DSP_GETTRIGGER"}, + {SNDCTL_DSP_SETTRIGGER, "SNDCTL_DSP_SETTRIGGER"}, + {SNDCTL_DSP_GETIPTR, "SNDCTL_DSP_GETIPTR"}, + {SNDCTL_DSP_GETOPTR, "SNDCTL_DSP_GETOPTR"}, + {SNDCTL_DSP_MAPINBUF, "SNDCTL_DSP_MAPINBUF"}, + {SNDCTL_DSP_MAPOUTBUF, "SNDCTL_DSP_MAPOUTBUF"}, + {SNDCTL_DSP_SETSYNCRO, "SNDCTL_DSP_SETSYNCRO"}, + {SNDCTL_DSP_SETDUPLEX, "SNDCTL_DSP_SETDUPLEX"}, + {SNDCTL_DSP_GETODELAY, "SNDCTL_DSP_GETODELAY"}, + {SNDCTL_DSP_GETCHANNELMASK, "SNDCTL_DSP_GETCHANNELMASK"}, + {SNDCTL_DSP_BIND_CHANNEL, "SNDCTL_DSP_BIND_CHANNEL"}, + {OSS_GETVERSION, "OSS_GETVERSION"}, + {SOUND_PCM_READ_RATE, "SOUND_PCM_READ_RATE"}, + {SOUND_PCM_READ_CHANNELS, "SOUND_PCM_READ_CHANNELS"}, + {SOUND_PCM_READ_BITS, "SOUND_PCM_READ_BITS"}, + {SOUND_PCM_READ_FILTER, "SOUND_PCM_READ_FILTER"} +}; +#endif + +// Need to hold a spin-lock before calling this! +static int dma_count_done(struct dmabuf *db) +{ + if (db->stopped) + return 0; + + return db->dma_fragsize - get_dma_residue(db->dmanr); +} + + +static int au1000_ioctl(struct inode *inode, struct file *file, + unsigned int cmd, unsigned long arg) +{ + struct au1000_state *s = (struct au1000_state *)file->private_data; + unsigned long flags; + audio_buf_info abinfo; + count_info cinfo; + int count; + int val, mapped, ret, diff; + + mapped = ((file->f_mode & FMODE_WRITE) && s->dma_dac.mapped) || + ((file->f_mode & FMODE_READ) && s->dma_adc.mapped); + +#ifdef AU1000_VERBOSE_DEBUG + for (count=0; count<sizeof(ioctl_str)/sizeof(ioctl_str[0]); count++) { + if (ioctl_str[count].cmd == cmd) + break; + } + if (count < sizeof(ioctl_str) / sizeof(ioctl_str[0])) + dbg("ioctl %s, arg=0x%lx", ioctl_str[count].str, arg); + else + dbg("ioctl 0x%x unknown, arg=0x%lx", cmd, arg); +#endif + + switch (cmd) { + case OSS_GETVERSION: + return put_user(SOUND_VERSION, (int *) arg); + + case SNDCTL_DSP_SYNC: + if (file->f_mode & FMODE_WRITE) + return drain_dac(s, file->f_flags & O_NONBLOCK); + return 0; + + case SNDCTL_DSP_SETDUPLEX: + return 0; + + case SNDCTL_DSP_GETCAPS: + return put_user(DSP_CAP_DUPLEX | DSP_CAP_REALTIME | + DSP_CAP_TRIGGER | DSP_CAP_MMAP, (int *)arg); + + case SNDCTL_DSP_RESET: + if (file->f_mode & FMODE_WRITE) { + stop_dac(s); + synchronize_irq(); + s->dma_dac.count = s->dma_dac.total_bytes = 0; + s->dma_dac.nextIn = s->dma_dac.nextOut = + s->dma_dac.rawbuf; + } + if (file->f_mode & FMODE_READ) { + stop_adc(s); + synchronize_irq(); + s->dma_adc.count = s->dma_adc.total_bytes = 0; + s->dma_adc.nextIn = s->dma_adc.nextOut = + s->dma_adc.rawbuf; + } + return 0; + + case SNDCTL_DSP_SPEED: + if (get_user(val, (int *) arg)) + return -EFAULT; + if (val >= 0) { + if (file->f_mode & FMODE_READ) { + stop_adc(s); + set_adc_rate(s, val); + } + if (file->f_mode & FMODE_WRITE) { + stop_dac(s); + set_dac_rate(s, val); + } + if (s->open_mode & FMODE_READ) + if ((ret = prog_dmabuf_adc(s))) + return ret; + if (s->open_mode & FMODE_WRITE) + if ((ret = prog_dmabuf_dac(s))) + return ret; + } + return put_user((file->f_mode & FMODE_READ) ? + s->dma_adc.sample_rate : + s->dma_dac.sample_rate, + (int *)arg); + + case SNDCTL_DSP_STEREO: + if (get_user(val, (int *) arg)) + return -EFAULT; + if (file->f_mode & FMODE_READ) { + stop_adc(s); + s->dma_adc.num_channels = val ? 2 : 1; + if ((ret = prog_dmabuf_adc(s))) + return ret; + } + if (file->f_mode & FMODE_WRITE) { + stop_dac(s); + s->dma_dac.num_channels = val ? 2 : 1; + if (s->codec_ext_caps & AC97_EXT_DACS) { + // disable surround and center/lfe in AC'97 + u16 ext_stat = rdcodec(&s->codec, + AC97_EXTENDED_STATUS); + wrcodec(&s->codec, AC97_EXTENDED_STATUS, + ext_stat | (AC97_EXTSTAT_PRI | + AC97_EXTSTAT_PRJ | + AC97_EXTSTAT_PRK)); + } + if ((ret = prog_dmabuf_dac(s))) + return ret; + } + return 0; + + case SNDCTL_DSP_CHANNELS: + if (get_user(val, (int *) arg)) + return -EFAULT; + if (val != 0) { + if (file->f_mode & FMODE_READ) { + if (val < 0 || val > 2) + return -EINVAL; + stop_adc(s); + s->dma_adc.num_channels = val; + if ((ret = prog_dmabuf_adc(s))) + return ret; + } + if (file->f_mode & FMODE_WRITE) { + switch (val) { + case 1: + case 2: + break; + case 3: + case 5: + return -EINVAL; + case 4: + if (!(s->codec_ext_caps & + AC97_EXTID_SDAC)) + return -EINVAL; + break; + case 6: + if ((s->codec_ext_caps & + AC97_EXT_DACS) != AC97_EXT_DACS) + return -EINVAL; + break; + default: + return -EINVAL; + } + + stop_dac(s); + if (val <= 2 && + (s->codec_ext_caps & AC97_EXT_DACS)) { + // disable surround and center/lfe + // channels in AC'97 + u16 ext_stat = + rdcodec(&s->codec, + AC97_EXTENDED_STATUS); + wrcodec(&s->codec, + AC97_EXTENDED_STATUS, + ext_stat | (AC97_EXTSTAT_PRI | + AC97_EXTSTAT_PRJ | + AC97_EXTSTAT_PRK)); + } else if (val >= 4) { + // enable surround, center/lfe + // channels in AC'97 + u16 ext_stat = + rdcodec(&s->codec, + AC97_EXTENDED_STATUS); + ext_stat &= ~AC97_EXTSTAT_PRJ; + if (val == 6) + ext_stat &= + ~(AC97_EXTSTAT_PRI | + AC97_EXTSTAT_PRK); + wrcodec(&s->codec, + AC97_EXTENDED_STATUS, + ext_stat); + } + + s->dma_dac.num_channels = val; + if ((ret = prog_dmabuf_dac(s))) + return ret; + } + } + return put_user(val, (int *) arg); + + case SNDCTL_DSP_GETFMTS: /* Returns a mask */ + return put_user(AFMT_S16_LE | AFMT_U8, (int *) arg); + + case SNDCTL_DSP_SETFMT: /* Selects ONE fmt */ + if (get_user(val, (int *) arg)) + return -EFAULT; + if (val != AFMT_QUERY) { + if (file->f_mode & FMODE_READ) { + stop_adc(s); + if (val == AFMT_S16_LE) + s->dma_adc.sample_size = 16; + else { + val = AFMT_U8; + s->dma_adc.sample_size = 8; + } + if ((ret = prog_dmabuf_adc(s))) + return ret; + } + if (file->f_mode & FMODE_WRITE) { + stop_dac(s); + if (val == AFMT_S16_LE) + s->dma_dac.sample_size = 16; + else { + val = AFMT_U8; + s->dma_dac.sample_size = 8; + } + if ((ret = prog_dmabuf_dac(s))) + return ret; + } + } else { + if (file->f_mode & FMODE_READ) + val = (s->dma_adc.sample_size == 16) ? + AFMT_S16_LE : AFMT_U8; + else + val = (s->dma_dac.sample_size == 16) ? + AFMT_S16_LE : AFMT_U8; + } + return put_user(val, (int *) arg); + + case SNDCTL_DSP_POST: + return 0; + + case SNDCTL_DSP_GETTRIGGER: + val = 0; + spin_lock_irqsave(&s->lock, flags); + if (file->f_mode & FMODE_READ && !s->dma_adc.stopped) + val |= PCM_ENABLE_INPUT; + if (file->f_mode & FMODE_WRITE && !s->dma_dac.stopped) + val |= PCM_ENABLE_OUTPUT; + spin_unlock_irqrestore(&s->lock, flags); + return put_user(val, (int *) arg); + + case SNDCTL_DSP_SETTRIGGER: + if (get_user(val, (int *) arg)) + return -EFAULT; + if (file->f_mode & FMODE_READ) { + if (val & PCM_ENABLE_INPUT) + start_adc(s); + else + stop_adc(s); + } + if (file->f_mode & FMODE_WRITE) { + if (val & PCM_ENABLE_OUTPUT) + start_dac(s); + else + stop_dac(s); + } + return 0; + + case SNDCTL_DSP_GETOSPACE: + if (!(file->f_mode & FMODE_WRITE)) + return -EINVAL; + abinfo.fragsize = s->dma_dac.fragsize; + spin_lock_irqsave(&s->lock, flags); + count = s->dma_dac.count; + count -= dma_count_done(&s->dma_dac); + spin_unlock_irqrestore(&s->lock, flags); + if (count < 0) + count = 0; + abinfo.bytes = (s->dma_dac.dmasize - count) / + s->dma_dac.cnt_factor; + abinfo.fragstotal = s->dma_dac.numfrag; + abinfo.fragments = abinfo.bytes >> s->dma_dac.fragshift; +#ifdef AU1000_VERBOSE_DEBUG + dbg("bytes=%d, fragments=%d", abinfo.bytes, abinfo.fragments); +#endif + return copy_to_user((void *) arg, &abinfo, + sizeof(abinfo)) ? -EFAULT : 0; + + case SNDCTL_DSP_GETISPACE: + if (!(file->f_mode & FMODE_READ)) + return -EINVAL; + abinfo.fragsize = s->dma_adc.fragsize; + spin_lock_irqsave(&s->lock, flags); + count = s->dma_adc.count; + count += dma_count_done(&s->dma_adc); + spin_unlock_irqrestore(&s->lock, flags); + if (count < 0) + count = 0; + abinfo.bytes = count / s->dma_adc.cnt_factor; + abinfo.fragstotal = s->dma_adc.numfrag; + abinfo.fragments = abinfo.bytes >> s->dma_adc.fragshift; + 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_GETODELAY: + if (!(file->f_mode & FMODE_WRITE)) + return -EINVAL; + spin_lock_irqsave(&s->lock, flags); + count = s->dma_dac.count; + count -= dma_count_done(&s->dma_dac); + spin_unlock_irqrestore(&s->lock, flags); + if (count < 0) + count = 0; + count /= s->dma_dac.cnt_factor; + return put_user(count, (int *) arg); + + case SNDCTL_DSP_GETIPTR: + if (!(file->f_mode & FMODE_READ)) + return -EINVAL; + spin_lock_irqsave(&s->lock, flags); + cinfo.bytes = s->dma_adc.total_bytes; + count = s->dma_adc.count; + if (!s->dma_adc.stopped) { + diff = dma_count_done(&s->dma_adc); + count += diff; + cinfo.bytes += diff; + cinfo.ptr = virt_to_phys(s->dma_adc.nextIn) + diff - + s->dma_adc.dmaaddr; + } else + cinfo.ptr = virt_to_phys(s->dma_adc.nextIn) - + s->dma_adc.dmaaddr; + if (s->dma_adc.mapped) + s->dma_adc.count &= (s->dma_adc.dma_fragsize-1); + spin_unlock_irqrestore(&s->lock, flags); + if (count < 0) + count = 0; + cinfo.blocks = count >> s->dma_adc.fragshift; + return copy_to_user((void *) arg, &cinfo, sizeof(cinfo)) ? -EFAULT : 0; + + case SNDCTL_DSP_GETOPTR: + if (!(file->f_mode & FMODE_READ)) + return -EINVAL; + spin_lock_irqsave(&s->lock, flags); + cinfo.bytes = s->dma_dac.total_bytes; + count = s->dma_dac.count; + if (!s->dma_dac.stopped) { + diff = dma_count_done(&s->dma_dac); + count -= diff; + cinfo.bytes += diff; + cinfo.ptr = virt_to_phys(s->dma_dac.nextOut) + diff - + s->dma_dac.dmaaddr; + } else + cinfo.ptr = virt_to_phys(s->dma_dac.nextOut) - + s->dma_dac.dmaaddr; + if (s->dma_dac.mapped) + s->dma_dac.count &= (s->dma_dac.dma_fragsize-1); + spin_unlock_irqrestore(&s->lock, flags); + if (count < 0) + count = 0; + cinfo.blocks = count >> s->dma_dac.fragshift; + return copy_to_user((void *) arg, &cinfo, sizeof(cinfo)) ? -EFAULT : 0; + + case SNDCTL_DSP_GETBLKSIZE: + if (file->f_mode & FMODE_WRITE) + return put_user(s->dma_dac.fragsize, (int *) arg); + else + return put_user(s->dma_adc.fragsize, (int *) arg); + + case SNDCTL_DSP_SETFRAGMENT: + if (get_user(val, (int *) arg)) + return -EFAULT; + if (file->f_mode & FMODE_READ) { + stop_adc(s); + s->dma_adc.ossfragshift = val & 0xffff; + s->dma_adc.ossmaxfrags = (val >> 16) & 0xffff; + if (s->dma_adc.ossfragshift < 4) + s->dma_adc.ossfragshift = 4; + if (s->dma_adc.ossfragshift > 15) + s->dma_adc.ossfragshift = 15; + if (s->dma_adc.ossmaxfrags < 4) + s->dma_adc.ossmaxfrags = 4; + if ((ret = prog_dmabuf_adc(s))) + return ret; + } + if (file->f_mode & FMODE_WRITE) { + stop_dac(s); + s->dma_dac.ossfragshift = val & 0xffff; + s->dma_dac.ossmaxfrags = (val >> 16) & 0xffff; + if (s->dma_dac.ossfragshift < 4) + s->dma_dac.ossfragshift = 4; + if (s->dma_dac.ossfragshift > 15) + s->dma_dac.ossfragshift = 15; + if (s->dma_dac.ossmaxfrags < 4) + s->dma_dac.ossmaxfrags = 4; + if ((ret = prog_dmabuf_dac(s))) + return ret; + } + return 0; + + case SNDCTL_DSP_SUBDIVIDE: + if ((file->f_mode & FMODE_READ && s->dma_adc.subdivision) || + (file->f_mode & FMODE_WRITE && s->dma_dac.subdivision)) + return -EINVAL; + if (get_user(val, (int *) arg)) + return -EFAULT; + if (val != 1 && val != 2 && val != 4) + return -EINVAL; + if (file->f_mode & FMODE_READ) { + stop_adc(s); + s->dma_adc.subdivision = val; + if ((ret = prog_dmabuf_adc(s))) + return ret; + } + if (file->f_mode & FMODE_WRITE) { + stop_dac(s); + s->dma_dac.subdivision = val; + if ((ret = prog_dmabuf_dac(s))) + return ret; + } + return 0; + + case SOUND_PCM_READ_RATE: + return put_user((file->f_mode & FMODE_READ) ? + s->dma_adc.sample_rate : + s->dma_dac.sample_rate, + (int *)arg); + + case SOUND_PCM_READ_CHANNELS: + if (file->f_mode & FMODE_READ) + return put_user(s->dma_adc.num_channels, (int *)arg); + else + return put_user(s->dma_dac.num_channels, (int *)arg); + + case SOUND_PCM_READ_BITS: + if (file->f_mode & FMODE_READ) + return put_user(s->dma_adc.sample_size, (int *)arg); + else + return put_user(s->dma_dac.sample_size, (int *)arg); + + case SOUND_PCM_WRITE_FILTER: + case SNDCTL_DSP_SETSYNCRO: + case SOUND_PCM_READ_FILTER: + return -EINVAL; + } + + return mixdev_ioctl(&s->codec, cmd, arg); +} + + +static int au1000_open(struct inode *inode, struct file *file) +{ + int minor = iminor(inode); + DECLARE_WAITQUEUE(wait, current); + struct au1000_state *s = &au1000_state; + int ret; + +#ifdef AU1000_VERBOSE_DEBUG + if (file->f_flags & O_NONBLOCK) + dbg("%s: non-blocking", __FUNCTION__); + else + dbg("%s: blocking", __FUNCTION__); +#endif + + file->private_data = s; + /* wait for device to become free */ + down(&s->open_sem); + while (s->open_mode & file->f_mode) { + if (file->f_flags & O_NONBLOCK) { + up(&s->open_sem); + return -EBUSY; + } + add_wait_queue(&s->open_wait, &wait); + __set_current_state(TASK_INTERRUPTIBLE); + up(&s->open_sem); + schedule(); + remove_wait_queue(&s->open_wait, &wait); + set_current_state(TASK_RUNNING); + if (signal_pending(current)) + return -ERESTARTSYS; + down(&s->open_sem); + } + + stop_dac(s); + stop_adc(s); + + if (file->f_mode & FMODE_READ) { + s->dma_adc.ossfragshift = s->dma_adc.ossmaxfrags = + s->dma_adc.subdivision = s->dma_adc.total_bytes = 0; + s->dma_adc.num_channels = 1; + s->dma_adc.sample_size = 8; + set_adc_rate(s, 8000); + if ((minor & 0xf) == SND_DEV_DSP16) + s->dma_adc.sample_size = 16; + } + + if (file->f_mode & FMODE_WRITE) { + s->dma_dac.ossfragshift = s->dma_dac.ossmaxfrags = + s->dma_dac.subdivision = s->dma_dac.total_bytes = 0; + s->dma_dac.num_channels = 1; + s->dma_dac.sample_size = 8; + set_dac_rate(s, 8000); + if ((minor & 0xf) == SND_DEV_DSP16) + s->dma_dac.sample_size = 16; + } + + if (file->f_mode & FMODE_READ) { + if ((ret = prog_dmabuf_adc(s))) + return ret; + } + if (file->f_mode & FMODE_WRITE) { + if ((ret = prog_dmabuf_dac(s))) + return ret; + } + + s->open_mode |= file->f_mode & (FMODE_READ | FMODE_WRITE); + up(&s->open_sem); + init_MUTEX(&s->sem); + return nonseekable_open(inode, file); +} + +static int au1000_release(struct inode *inode, struct file *file) +{ + struct au1000_state *s = (struct au1000_state *)file->private_data; + + lock_kernel(); + + if (file->f_mode & FMODE_WRITE) { + unlock_kernel(); + drain_dac(s, file->f_flags & O_NONBLOCK); + lock_kernel(); + } + + down(&s->open_sem); + if (file->f_mode & FMODE_WRITE) { + stop_dac(s); + dealloc_dmabuf(s, &s->dma_dac); + } + if (file->f_mode & FMODE_READ) { + stop_adc(s); + dealloc_dmabuf(s, &s->dma_adc); + } + s->open_mode &= ((~file->f_mode) & (FMODE_READ|FMODE_WRITE)); + up(&s->open_sem); + wake_up(&s->open_wait); + unlock_kernel(); + return 0; +} + +static /*const */ struct file_operations au1000_audio_fops = { + .owner = THIS_MODULE, + .llseek = au1000_llseek, + .read = au1000_read, + .write = au1000_write, + .poll = au1000_poll, + .ioctl = au1000_ioctl, + .mmap = au1000_mmap, + .open = au1000_open, + .release = au1000_release, +}; + + +/* --------------------------------------------------------------------- */ + + +/* --------------------------------------------------------------------- */ + +/* + * for debugging purposes, we'll create a proc device that dumps the + * CODEC chipstate + */ + +#ifdef AU1000_DEBUG +static int proc_au1000_dump(char *buf, char **start, off_t fpos, + int length, int *eof, void *data) +{ + struct au1000_state *s = &au1000_state; + int cnt, len = 0; + + /* print out header */ + len += sprintf(buf + len, "\n\t\tAU1000 Audio Debug\n\n"); + + // print out digital controller state + len += sprintf(buf + len, "AU1000 Audio Controller registers\n"); + len += sprintf(buf + len, "---------------------------------\n"); + len += sprintf (buf + len, "AC97C_CONFIG = %08x\n", + au_readl(AC97C_CONFIG)); + len += sprintf (buf + len, "AC97C_STATUS = %08x\n", + au_readl(AC97C_STATUS)); + len += sprintf (buf + len, "AC97C_CNTRL = %08x\n", + au_readl(AC97C_CNTRL)); + + /* print out CODEC state */ + len += sprintf(buf + len, "\nAC97 CODEC registers\n"); + len += sprintf(buf + len, "----------------------\n"); + for (cnt = 0; cnt <= 0x7e; cnt += 2) + len += sprintf(buf + len, "reg %02x = %04x\n", + cnt, rdcodec(&s->codec, cnt)); + + if (fpos >= len) { + *start = buf; + *eof = 1; + return 0; + } + *start = buf + fpos; + if ((len -= fpos) > length) + return length; + *eof = 1; + return len; + +} +#endif /* AU1000_DEBUG */ + +/* --------------------------------------------------------------------- */ + +MODULE_AUTHOR("Monta Vista Software, stevel@mvista.com"); +MODULE_DESCRIPTION("Au1000 Audio Driver"); + +/* --------------------------------------------------------------------- */ + +static int __devinit au1000_probe(void) +{ + struct au1000_state *s = &au1000_state; + int val; +#ifdef AU1000_DEBUG + char proc_str[80]; +#endif + + memset(s, 0, sizeof(struct au1000_state)); + + init_waitqueue_head(&s->dma_adc.wait); + init_waitqueue_head(&s->dma_dac.wait); + init_waitqueue_head(&s->open_wait); + init_MUTEX(&s->open_sem); + spin_lock_init(&s->lock); + s->codec.private_data = s; + s->codec.id = 0; + s->codec.codec_read = rdcodec; + s->codec.codec_write = wrcodec; + s->codec.codec_wait = waitcodec; + + if (!request_mem_region(CPHYSADDR(AC97C_CONFIG), + 0x14, AU1000_MODULE_NAME)) { + err("AC'97 ports in use"); + return -1; + } + // Allocate the DMA Channels + if ((s->dma_dac.dmanr = request_au1000_dma(DMA_ID_AC97C_TX, + "audio DAC", + dac_dma_interrupt, + SA_INTERRUPT, s)) < 0) { + err("Can't get DAC DMA"); + goto err_dma1; + } + if ((s->dma_adc.dmanr = request_au1000_dma(DMA_ID_AC97C_RX, + "audio ADC", + adc_dma_interrupt, + SA_INTERRUPT, s)) < 0) { + err("Can't get ADC DMA"); + goto err_dma2; + } + + info("DAC: DMA%d/IRQ%d, ADC: DMA%d/IRQ%d", + s->dma_dac.dmanr, get_dma_done_irq(s->dma_dac.dmanr), + s->dma_adc.dmanr, get_dma_done_irq(s->dma_adc.dmanr)); + + // enable DMA coherency in read/write DMA channels + set_dma_mode(s->dma_dac.dmanr, + get_dma_mode(s->dma_dac.dmanr) & ~DMA_NC); + set_dma_mode(s->dma_adc.dmanr, + get_dma_mode(s->dma_adc.dmanr) & ~DMA_NC); + + /* register devices */ + + if ((s->dev_audio = register_sound_dsp(&au1000_audio_fops, -1)) < 0) + goto err_dev1; + if ((s->codec.dev_mixer = + register_sound_mixer(&au1000_mixer_fops, -1)) < 0) + goto err_dev2; + +#ifdef AU1000_DEBUG + /* intialize the debug proc device */ + s->ps = create_proc_read_entry(AU1000_MODULE_NAME, 0, NULL, + proc_au1000_dump, NULL); +#endif /* AU1000_DEBUG */ + + // configure pins for AC'97 + au_writel(au_readl(SYS_PINFUNC) & ~0x02, SYS_PINFUNC); + + // Assert reset for 10msec to the AC'97 controller, and enable clock + au_writel(AC97C_RS | AC97C_CE, AC97C_CNTRL); + au1000_delay(10); + au_writel(AC97C_CE, AC97C_CNTRL); + au1000_delay(10); // wait for clock to stabilize + + /* cold reset the AC'97 */ + au_writel(AC97C_RESET, AC97C_CONFIG); + au1000_delay(10); + au_writel(0, AC97C_CONFIG); + /* need to delay around 500msec(bleech) to give + some CODECs enough time to wakeup */ + au1000_delay(500); + + /* warm reset the AC'97 to start the bitclk */ + au_writel(AC97C_SG | AC97C_SYNC, AC97C_CONFIG); + udelay(100); + au_writel(0, AC97C_CONFIG); + + /* codec init */ + if (!ac97_probe_codec(&s->codec)) + goto err_dev3; + + s->codec_base_caps = rdcodec(&s->codec, AC97_RESET); + s->codec_ext_caps = rdcodec(&s->codec, AC97_EXTENDED_ID); + info("AC'97 Base/Extended ID = %04x/%04x", + s->codec_base_caps, s->codec_ext_caps); + + /* + * On the Pb1000, audio playback is on the AUX_OUT + * channel (which defaults to LNLVL_OUT in AC'97 + * rev 2.2) so make sure this channel is listed + * as supported (soundcard.h calls this channel + * ALTPCM). ac97_codec.c does not handle detection + * of this channel correctly. + */ + s->codec.supported_mixers |= SOUND_MASK_ALTPCM; + /* + * Now set AUX_OUT's default volume. + */ + val = 0x4343; + mixdev_ioctl(&s->codec, SOUND_MIXER_WRITE_ALTPCM, + (unsigned long) &val); + + if (!(s->codec_ext_caps & AC97_EXTID_VRA)) { + // codec does not support VRA + s->no_vra = 1; + } else if (!vra) { + // Boot option says disable VRA + u16 ac97_extstat = rdcodec(&s->codec, AC97_EXTENDED_STATUS); + wrcodec(&s->codec, AC97_EXTENDED_STATUS, + ac97_extstat & ~AC97_EXTSTAT_VRA); + s->no_vra = 1; + } + if (s->no_vra) + info("no VRA, interpolating and decimating"); + + /* set mic to be the recording source */ + val = SOUND_MASK_MIC; + mixdev_ioctl(&s->codec, SOUND_MIXER_WRITE_RECSRC, + (unsigned long) &val); + +#ifdef AU1000_DEBUG + sprintf(proc_str, "driver/%s/%d/ac97", AU1000_MODULE_NAME, + s->codec.id); + s->ac97_ps = create_proc_read_entry (proc_str, 0, NULL, + ac97_read_proc, &s->codec); +#endif + +#ifdef CONFIG_MIPS_XXS1500 + /* deassert eapd */ + wrcodec(&s->codec, AC97_POWER_CONTROL, + rdcodec(&s->codec, AC97_POWER_CONTROL) & ~0x8000); + /* mute a number of signals which seem to be causing problems + * if not muted. + */ + wrcodec(&s->codec, AC97_PCBEEP_VOL, 0x8000); + wrcodec(&s->codec, AC97_PHONE_VOL, 0x8008); + wrcodec(&s->codec, AC97_MIC_VOL, 0x8008); + wrcodec(&s->codec, AC97_LINEIN_VOL, 0x8808); + wrcodec(&s->codec, AC97_CD_VOL, 0x8808); + wrcodec(&s->codec, AC97_VIDEO_VOL, 0x8808); + wrcodec(&s->codec, AC97_AUX_VOL, 0x8808); + wrcodec(&s->codec, AC97_PCMOUT_VOL, 0x0808); + wrcodec(&s->codec, AC97_GENERAL_PURPOSE, 0x2000); +#endif + + return 0; + + err_dev3: + unregister_sound_mixer(s->codec.dev_mixer); + err_dev2: + unregister_sound_dsp(s->dev_audio); + err_dev1: + free_au1000_dma(s->dma_adc.dmanr); + err_dma2: + free_au1000_dma(s->dma_dac.dmanr); + err_dma1: + release_mem_region(CPHYSADDR(AC97C_CONFIG), 0x14); + return -1; +} + +static void au1000_remove(void) +{ + struct au1000_state *s = &au1000_state; + + if (!s) + return; +#ifdef AU1000_DEBUG + if (s->ps) + remove_proc_entry(AU1000_MODULE_NAME, NULL); +#endif /* AU1000_DEBUG */ + synchronize_irq(); + free_au1000_dma(s->dma_adc.dmanr); + free_au1000_dma(s->dma_dac.dmanr); + release_mem_region(CPHYSADDR(AC97C_CONFIG), 0x14); + unregister_sound_dsp(s->dev_audio); + unregister_sound_mixer(s->codec.dev_mixer); +} + +static int __init init_au1000(void) +{ + info("stevel@mvista.com, built " __TIME__ " on " __DATE__); + return au1000_probe(); +} + +static void __exit cleanup_au1000(void) +{ + info("unloading"); + au1000_remove(); +} + +module_init(init_au1000); +module_exit(cleanup_au1000); + +/* --------------------------------------------------------------------- */ + +#ifndef MODULE + +static int __init au1000_setup(char *options) +{ + char *this_opt; + + if (!options || !*options) + return 0; + + while ((this_opt = strsep(&options, ","))) { + if (!*this_opt) + continue; + if (!strncmp(this_opt, "vra", 3)) { + vra = 1; + } + } + + return 1; +} + +__setup("au1000_audio=", au1000_setup); + +#endif /* MODULE */ |