[ALSA] ad1889: add AD1889 driver

PCI drivers,AD1889 driver
move the AD1889 driver to the kernel tree

Acked-by: Thibaut Varene <varenet@parisc-linux.org>
Acked-by: Kyle McMartin <kyle@parisc-linux.org>

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>

1 files changed, 1089 insertions, 0 deletions

diff --git a/sound/pci/ad1889.c b/sound/pci/ad1889.c
new file mode 100644
index 000000000000..37e8df24711c
--- /dev/null
+++ b/sound/pci/ad1889.c
@@ -0,0 +1,1089 @@
+/* Analog Devices 1889 audio driver
+ *
+ * This is a driver for the AD1889 PCI audio chipset found
+ * on the HP PA-RISC [BCJ]-xxx0 workstations.
+ *
+ * Copyright (C) 2004-2005, Kyle McMartin <kyle@parisc-linux.org>
+ * Copyright (C) 2005, Thibaut Varene <varenet@parisc-linux.org>
+ *   Based on the OSS AD1889 driver by Randolph Chung <tausq@debian.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * 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.
+ *
+ * TODO:
+ *	Do we need to take care of CCS register?
+ *	Maybe we could use finer grained locking (separate locks for pb/cap)?
+ * Wishlist:
+ *	Control Interface (mixer) support
+ *	Better AC97 support (VSR...)?
+ *	PM support
+ *	MIDI support
+ *	Game Port support
+ *	SG DMA support (this will need *alot* of work)
+ */
+
+#include <linux/init.h>
+#include <linux/pci.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/compiler.h>
+#include <linux/delay.h>
+
+#include <sound/driver.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/initval.h>
+#include <sound/ac97_codec.h>
+
+#include <asm/io.h>
+
+#include "ad1889.h"
+#include "ac97/ac97_id.h"
+
+#define	AD1889_DRVVER	"$Revision: 1.1 $"
+
+MODULE_AUTHOR("Kyle McMartin <kyle@parisc-linux.org>, Thibaut Varene <t-bone@parisc-linux.org>");
+MODULE_DESCRIPTION("Analog Devices AD1889 ALSA sound driver");
+MODULE_LICENSE("GPL");
+MODULE_SUPPORTED_DEVICE("{{Analog Devices,AD1889}}");
+
+static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
+module_param_array(index, int, NULL, 0444);
+MODULE_PARM_DESC(index, "Index value for the AD1889 soundcard.");
+
+static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;
+module_param_array(id, charp, NULL, 0444);
+MODULE_PARM_DESC(id, "ID string for the AD1889 soundcard.");
+
+static int enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;
+module_param_array(enable, bool, NULL, 0444);
+MODULE_PARM_DESC(enable, "Enable AD1889 soundcard.");
+
+static char *ac97_quirk[SNDRV_CARDS];
+module_param_array(ac97_quirk, charp, NULL, 0444);
+MODULE_PARM_DESC(ac97_quirk, "AC'97 workaround for strange hardware.");
+
+#define DEVNAME "ad1889"
+#define PFX	DEVNAME ": "
+
+/* let's use the global sound debug interfaces */
+#define ad1889_debug(fmt, arg...) snd_printd(KERN_DEBUG fmt, ## arg)
+
+/* keep track of some hw registers */
+struct ad1889_register_state {
+	u16 reg;	/* reg setup */
+	u32 addr;	/* dma base address */
+	unsigned long size;	/* DMA buffer size */
+};
+
+struct snd_ad1889 {
+	snd_card_t *card;
+	struct pci_dev *pci;
+
+	int irq;
+	unsigned long bar;
+	void __iomem *iobase;
+
+	ac97_t *ac97;
+	ac97_bus_t *ac97_bus;
+	snd_pcm_t *pcm;
+	snd_info_entry_t *proc;
+
+	snd_pcm_substream_t *psubs;
+	snd_pcm_substream_t *csubs;
+
+	/* playback register state */
+	struct ad1889_register_state wave;
+	struct ad1889_register_state ramc;
+
+	spinlock_t lock;
+};
+
+static inline u16
+ad1889_readw(struct snd_ad1889 *chip, unsigned reg)
+{
+	return readw(chip->iobase + reg);
+}
+
+static inline void
+ad1889_writew(struct snd_ad1889 *chip, unsigned reg, u16 val)
+{
+	writew(val, chip->iobase + reg);
+}
+
+static inline u32
+ad1889_readl(struct snd_ad1889 *chip, unsigned reg)
+{
+	return readl(chip->iobase + reg);
+}
+
+static inline void
+ad1889_writel(struct snd_ad1889 *chip, unsigned reg, u32 val)
+{
+	writel(val, chip->iobase + reg);
+}
+
+static inline void
+ad1889_unmute(struct snd_ad1889 *chip)
+{
+	u16 st;
+	st = ad1889_readw(chip, AD_DS_WADA) & 
+		~(AD_DS_WADA_RWAM | AD_DS_WADA_LWAM);
+	ad1889_writew(chip, AD_DS_WADA, st);
+	ad1889_readw(chip, AD_DS_WADA);
+}
+
+static inline void
+ad1889_mute(struct snd_ad1889 *chip)
+{
+	u16 st;
+	st = ad1889_readw(chip, AD_DS_WADA) | AD_DS_WADA_RWAM | AD_DS_WADA_LWAM;
+	ad1889_writew(chip, AD_DS_WADA, st);
+	ad1889_readw(chip, AD_DS_WADA);
+}
+
+static inline void
+ad1889_load_adc_buffer_address(struct snd_ad1889 *chip, u32 address)
+{
+	ad1889_writel(chip, AD_DMA_ADCBA, address);
+	ad1889_writel(chip, AD_DMA_ADCCA, address);
+}
+
+static inline void
+ad1889_load_adc_buffer_count(struct snd_ad1889 *chip, u32 count)
+{
+	ad1889_writel(chip, AD_DMA_ADCBC, count);
+	ad1889_writel(chip, AD_DMA_ADCCC, count);
+}
+
+static inline void
+ad1889_load_adc_interrupt_count(struct snd_ad1889 *chip, u32 count)
+{
+	ad1889_writel(chip, AD_DMA_ADCIB, count);
+	ad1889_writel(chip, AD_DMA_ADCIC, count);
+}
+
+static inline void
+ad1889_load_wave_buffer_address(struct snd_ad1889 *chip, u32 address)
+{
+	ad1889_writel(chip, AD_DMA_WAVBA, address);
+	ad1889_writel(chip, AD_DMA_WAVCA, address);
+}
+
+static inline void
+ad1889_load_wave_buffer_count(struct snd_ad1889 *chip, u32 count)
+{
+	ad1889_writel(chip, AD_DMA_WAVBC, count);
+	ad1889_writel(chip, AD_DMA_WAVCC, count);
+}
+
+static inline void
+ad1889_load_wave_interrupt_count(struct snd_ad1889 *chip, u32 count)
+{
+	ad1889_writel(chip, AD_DMA_WAVIB, count);
+	ad1889_writel(chip, AD_DMA_WAVIC, count);
+}
+
+static void
+ad1889_channel_reset(struct snd_ad1889 *chip, unsigned int channel)
+{
+	u16 reg;
+	
+	if (channel & AD_CHAN_WAV) {
+		/* Disable wave channel */
+		reg = ad1889_readw(chip, AD_DS_WSMC) & ~AD_DS_WSMC_WAEN;
+		ad1889_writew(chip, AD_DS_WSMC, reg);
+		chip->wave.reg = reg;
+		
+		/* disable IRQs */
+		reg = ad1889_readw(chip, AD_DMA_WAV);
+		reg &= AD_DMA_IM_DIS;
+		reg &= ~AD_DMA_LOOP;
+		ad1889_writew(chip, AD_DMA_WAV, reg);
+
+		/* clear IRQ and address counters and pointers */
+		ad1889_load_wave_buffer_address(chip, 0x0);
+		ad1889_load_wave_buffer_count(chip, 0x0);
+		ad1889_load_wave_interrupt_count(chip, 0x0);
+
+		/* flush */
+		ad1889_readw(chip, AD_DMA_WAV);
+	}
+	
+	if (channel & AD_CHAN_ADC) {
+		/* Disable ADC channel */
+		reg = ad1889_readw(chip, AD_DS_RAMC) & ~AD_DS_RAMC_ADEN;
+		ad1889_writew(chip, AD_DS_RAMC, reg);
+		chip->ramc.reg = reg;
+
+		reg = ad1889_readw(chip, AD_DMA_ADC);
+		reg &= AD_DMA_IM_DIS;
+		reg &= ~AD_DMA_LOOP;
+		ad1889_writew(chip, AD_DMA_ADC, reg);
+	
+		ad1889_load_adc_buffer_address(chip, 0x0);
+		ad1889_load_adc_buffer_count(chip, 0x0);
+		ad1889_load_adc_interrupt_count(chip, 0x0);
+
+		/* flush */
+		ad1889_readw(chip, AD_DMA_ADC);
+	}
+}
+
+static inline u16
+snd_ad1889_ac97_read(ac97_t *ac97, unsigned short reg)
+{
+	struct snd_ad1889 *chip = ac97->private_data;
+	return ad1889_readw(chip, AD_AC97_BASE + reg);
+}
+
+static inline void
+snd_ad1889_ac97_write(ac97_t *ac97, unsigned short reg, unsigned short val)
+{
+	struct snd_ad1889 *chip = ac97->private_data;
+	ad1889_writew(chip, AD_AC97_BASE + reg, val);
+}
+
+static int
+snd_ad1889_ac97_ready(struct snd_ad1889 *chip)
+{
+	int retry = 400; /* average needs 352 msec */
+	
+	while (!(ad1889_readw(chip, AD_AC97_ACIC) & AD_AC97_ACIC_ACRDY) 
+			&& --retry)
+		mdelay(1);
+	if (!retry) {
+		snd_printk(KERN_ERR PFX "[%s] Link is not ready.\n",
+		       __FUNCTION__);
+		return -EIO;
+	}
+	ad1889_debug("[%s] ready after %d ms\n", __FUNCTION__, 400 - retry);
+
+	return 0;
+}
+
+static int 
+snd_ad1889_hw_params(snd_pcm_substream_t *substream,
+			snd_pcm_hw_params_t *hw_params)
+{
+	return snd_pcm_lib_malloc_pages(substream, 
+					params_buffer_bytes(hw_params));
+}
+
+static int
+snd_ad1889_hw_free(snd_pcm_substream_t *substream)
+{
+	return snd_pcm_lib_free_pages(substream);
+}
+
+static snd_pcm_hardware_t snd_ad1889_playback_hw = {
+	.info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
+		SNDRV_PCM_INFO_MMAP_VALID | SNDRV_PCM_INFO_BLOCK_TRANSFER,
+	.formats = SNDRV_PCM_FMTBIT_S16_LE,
+	.rates = SNDRV_PCM_RATE_CONTINUOUS | SNDRV_PCM_RATE_8000_48000,
+	.rate_min = 8000,	/* docs say 7000, but we're lazy */
+	.rate_max = 48000,
+	.channels_min = 1,
+	.channels_max = 2,
+	.buffer_bytes_max = BUFFER_BYTES_MAX,
+	.period_bytes_min = PERIOD_BYTES_MIN,
+	.period_bytes_max = PERIOD_BYTES_MAX,
+	.periods_min = PERIODS_MIN,
+	.periods_max = PERIODS_MAX,
+	/*.fifo_size = 0,*/
+};
+
+static snd_pcm_hardware_t snd_ad1889_capture_hw = {
+	.info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
+		SNDRV_PCM_INFO_MMAP_VALID | SNDRV_PCM_INFO_BLOCK_TRANSFER,
+	.formats = SNDRV_PCM_FMTBIT_S16_LE,
+	.rates = SNDRV_PCM_RATE_48000,
+	.rate_min = 48000,	/* docs say we could to VSR, but we're lazy */
+	.rate_max = 48000,
+	.channels_min = 1,
+	.channels_max = 2,
+	.buffer_bytes_max = BUFFER_BYTES_MAX,
+	.period_bytes_min = PERIOD_BYTES_MIN,
+	.period_bytes_max = PERIOD_BYTES_MAX,
+	.periods_min = PERIODS_MIN,
+	.periods_max = PERIODS_MAX,
+	/*.fifo_size = 0,*/
+};
+
+static int
+snd_ad1889_playback_open(snd_pcm_substream_t *ss)
+{
+	struct snd_ad1889 *chip = snd_pcm_substream_chip(ss);
+	snd_pcm_runtime_t *rt = ss->runtime;
+
+	chip->psubs = ss;
+	rt->hw = snd_ad1889_playback_hw;
+
+	return 0;
+}
+
+static int
+snd_ad1889_capture_open(snd_pcm_substream_t *ss)
+{
+	struct snd_ad1889 *chip = snd_pcm_substream_chip(ss);
+	snd_pcm_runtime_t *rt = ss->runtime;
+
+	chip->csubs = ss;
+	rt->hw = snd_ad1889_capture_hw;
+
+	return 0;
+}
+
+static int
+snd_ad1889_playback_close(snd_pcm_substream_t *ss)
+{
+	struct snd_ad1889 *chip = snd_pcm_substream_chip(ss);
+	chip->psubs = NULL;
+	return 0;
+}
+
+static int
+snd_ad1889_capture_close(snd_pcm_substream_t *ss)
+{
+	struct snd_ad1889 *chip = snd_pcm_substream_chip(ss);
+	chip->csubs = NULL;
+	return 0;
+}
+
+static int
+snd_ad1889_playback_prepare(snd_pcm_substream_t *ss)
+{
+	struct snd_ad1889 *chip = snd_pcm_substream_chip(ss);
+	snd_pcm_runtime_t *rt = ss->runtime;
+	unsigned int size = snd_pcm_lib_buffer_bytes(ss);
+	unsigned int count = snd_pcm_lib_period_bytes(ss);
+	u16 reg;
+
+	ad1889_channel_reset(chip, AD_CHAN_WAV);
+
+	reg = ad1889_readw(chip, AD_DS_WSMC);
+	
+	/* Mask out 16-bit / Stereo */
+	reg &= ~(AD_DS_WSMC_WA16 | AD_DS_WSMC_WAST);
+
+	if (snd_pcm_format_width(rt->format) == 16)
+		reg |= AD_DS_WSMC_WA16;
+
+	if (rt->channels > 1)
+		reg |= AD_DS_WSMC_WAST;
+
+	/* let's make sure we don't clobber ourselves */
+	spin_lock_irq(&chip->lock);
+	
+	chip->wave.size = size;
+	chip->wave.reg = reg;
+	chip->wave.addr = rt->dma_addr;
+
+	ad1889_writew(chip, AD_DS_WSMC, chip->wave.reg);
+	
+	/* Set sample rates on the codec */
+	ad1889_writew(chip, AD_DS_WAS, rt->rate);
+
+	/* Set up DMA */
+	ad1889_load_wave_buffer_address(chip, chip->wave.addr);
+	ad1889_load_wave_buffer_count(chip, size);
+	ad1889_load_wave_interrupt_count(chip, count);
+
+	/* writes flush */
+	ad1889_readw(chip, AD_DS_WSMC);
+	
+	spin_unlock_irq(&chip->lock);
+	
+	ad1889_debug("prepare playback: addr = 0x%x, count = %u, "
+			"size = %u, reg = 0x%x, rate = %u\n", chip->wave.addr,
+			count, size, reg, rt->rate);
+	return 0;
+}
+
+static int
+snd_ad1889_capture_prepare(snd_pcm_substream_t *ss)
+{
+	struct snd_ad1889 *chip = snd_pcm_substream_chip(ss);
+	snd_pcm_runtime_t *rt = ss->runtime;
+	unsigned int size = snd_pcm_lib_buffer_bytes(ss);
+	unsigned int count = snd_pcm_lib_period_bytes(ss);
+	u16 reg;
+
+	ad1889_channel_reset(chip, AD_CHAN_ADC);
+	
+	reg = ad1889_readw(chip, AD_DS_RAMC);
+
+	/* Mask out 16-bit / Stereo */
+	reg &= ~(AD_DS_RAMC_AD16 | AD_DS_RAMC_ADST);
+
+	if (snd_pcm_format_width(rt->format) == 16)
+		reg |= AD_DS_RAMC_AD16;
+
+	if (rt->channels > 1)
+		reg |= AD_DS_RAMC_ADST;
+
+	/* let's make sure we don't clobber ourselves */
+	spin_lock_irq(&chip->lock);
+	
+	chip->ramc.size = size;
+	chip->ramc.reg = reg;
+	chip->ramc.addr = rt->dma_addr;
+
+	ad1889_writew(chip, AD_DS_RAMC, chip->ramc.reg);
+
+	/* Set up DMA */
+	ad1889_load_adc_buffer_address(chip, chip->ramc.addr);
+	ad1889_load_adc_buffer_count(chip, size);
+	ad1889_load_adc_interrupt_count(chip, count);
+
+	/* writes flush */
+	ad1889_readw(chip, AD_DS_RAMC);
+	
+	spin_unlock_irq(&chip->lock);
+	
+	ad1889_debug("prepare capture: addr = 0x%x, count = %u, "
+			"size = %u, reg = 0x%x, rate = %u\n", chip->ramc.addr,
+			count, size, reg, rt->rate);
+	return 0;
+}
+
+/* this is called in atomic context with IRQ disabled.
+   Must be as fast as possible and not sleep.
+   DMA should be *triggered* by this call.
+   The WSMC "WAEN" bit triggers DMA Wave On/Off */
+static int
+snd_ad1889_playback_trigger(snd_pcm_substream_t *ss, int cmd)
+{
+	u16 wsmc;
+	struct snd_ad1889 *chip = snd_pcm_substream_chip(ss);
+	
+	wsmc = ad1889_readw(chip, AD_DS_WSMC);
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+		/* enable DMA loop & interrupts */
+		ad1889_writew(chip, AD_DMA_WAV, AD_DMA_LOOP | AD_DMA_IM_CNT);
+		wsmc |= AD_DS_WSMC_WAEN;
+		/* 1 to clear CHSS bit */
+		ad1889_writel(chip, AD_DMA_CHSS, AD_DMA_CHSS_WAVS);
+		ad1889_unmute(chip);
+		break;
+	case SNDRV_PCM_TRIGGER_STOP:
+		ad1889_mute(chip);
+		wsmc &= ~AD_DS_WSMC_WAEN;
+		break;
+	default:
+		snd_BUG();
+		return -EINVAL;
+	}
+	
+	chip->wave.reg = wsmc;
+	ad1889_writew(chip, AD_DS_WSMC, wsmc);	
+	ad1889_readw(chip, AD_DS_WSMC);	/* flush */
+
+	/* reset the chip when STOP - will disable IRQs */
+	if (cmd == SNDRV_PCM_TRIGGER_STOP)
+		ad1889_channel_reset(chip, AD_CHAN_WAV);
+
+	return 0;
+}
+
+/* this is called in atomic context with IRQ disabled.
+   Must be as fast as possible and not sleep.
+   DMA should be *triggered* by this call.
+   The RAMC "ADEN" bit triggers DMA ADC On/Off */
+static int
+snd_ad1889_capture_trigger(snd_pcm_substream_t *ss, int cmd)
+{
+	u16 ramc;
+	struct snd_ad1889 *chip = snd_pcm_substream_chip(ss);
+
+	ramc = ad1889_readw(chip, AD_DS_RAMC);
+	
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+		/* enable DMA loop & interrupts */
+		ad1889_writew(chip, AD_DMA_ADC, AD_DMA_LOOP | AD_DMA_IM_CNT);
+		ramc |= AD_DS_RAMC_ADEN;
+		/* 1 to clear CHSS bit */
+		ad1889_writel(chip, AD_DMA_CHSS, AD_DMA_CHSS_ADCS);
+		break;
+	case SNDRV_PCM_TRIGGER_STOP:
+		ramc &= ~AD_DS_RAMC_ADEN;
+		break;
+	default:
+		return -EINVAL;
+	}
+	
+	chip->ramc.reg = ramc;
+	ad1889_writew(chip, AD_DS_RAMC, ramc);	
+	ad1889_readw(chip, AD_DS_RAMC);	/* flush */
+	
+	/* reset the chip when STOP - will disable IRQs */
+	if (cmd == SNDRV_PCM_TRIGGER_STOP)
+		ad1889_channel_reset(chip, AD_CHAN_ADC);
+		
+	return 0;
+}
+
+/* Called in atomic context with IRQ disabled */
+static snd_pcm_uframes_t
+snd_ad1889_playback_pointer(snd_pcm_substream_t *ss)
+{
+	size_t ptr = 0;
+	struct snd_ad1889 *chip = snd_pcm_substream_chip(ss);
+
+	if (unlikely(!(chip->wave.reg & AD_DS_WSMC_WAEN)))
+		return 0;
+
+	ptr = ad1889_readl(chip, AD_DMA_WAVCA);
+	ptr -= chip->wave.addr;
+	
+	snd_assert((ptr >= 0) && (ptr < chip->wave.size), return 0);
+	
+	return bytes_to_frames(ss->runtime, ptr);
+}
+
+/* Called in atomic context with IRQ disabled */
+static snd_pcm_uframes_t
+snd_ad1889_capture_pointer(snd_pcm_substream_t *ss)
+{
+	size_t ptr = 0;
+	struct snd_ad1889 *chip = snd_pcm_substream_chip(ss);
+
+	if (unlikely(!(chip->ramc.reg & AD_DS_RAMC_ADEN)))
+		return 0;
+
+	ptr = ad1889_readl(chip, AD_DMA_ADCCA);
+	ptr -= chip->ramc.addr;
+
+	snd_assert((ptr >= 0) && (ptr < chip->ramc.size), return 0);
+	
+	return bytes_to_frames(ss->runtime, ptr);
+}
+
+static snd_pcm_ops_t snd_ad1889_playback_ops = {
+	.open = snd_ad1889_playback_open,
+	.close = snd_ad1889_playback_close,
+	.ioctl = snd_pcm_lib_ioctl,
+	.hw_params = snd_ad1889_hw_params,
+	.hw_free = snd_ad1889_hw_free,
+	.prepare = snd_ad1889_playback_prepare,
+	.trigger = snd_ad1889_playback_trigger,
+	.pointer = snd_ad1889_playback_pointer, 
+};
+
+static snd_pcm_ops_t snd_ad1889_capture_ops = {
+	.open = snd_ad1889_capture_open,
+	.close = snd_ad1889_capture_close,
+	.ioctl = snd_pcm_lib_ioctl,
+	.hw_params = snd_ad1889_hw_params,
+	.hw_free = snd_ad1889_hw_free,
+	.prepare = snd_ad1889_capture_prepare,
+	.trigger = snd_ad1889_capture_trigger,
+	.pointer = snd_ad1889_capture_pointer, 
+};
+
+static irqreturn_t
+snd_ad1889_interrupt(int irq, 
+		     void *dev_id, 
+		     struct pt_regs *regs)
+{
+	unsigned long st;
+	struct snd_ad1889 *chip = dev_id;
+
+	st = ad1889_readl(chip, AD_DMA_DISR);
+
+	/* clear ISR */
+	ad1889_writel(chip, AD_DMA_DISR, st);
+
+	st &= AD_INTR_MASK;
+
+	if (unlikely(!st))
+		return IRQ_NONE;
+
+	if (st & (AD_DMA_DISR_PMAI|AD_DMA_DISR_PTAI))
+		ad1889_debug("Unexpected master or target abort interrupt!\n");
+
+	if ((st & AD_DMA_DISR_WAVI) && chip->psubs)
+		snd_pcm_period_elapsed(chip->psubs);
+	if ((st & AD_DMA_DISR_ADCI) && chip->csubs)
+		snd_pcm_period_elapsed(chip->csubs);
+
+	return IRQ_HANDLED;
+}
+
+static void 
+snd_ad1889_pcm_free(snd_pcm_t *pcm)
+{
+	struct snd_ad1889 *chip = pcm->private_data;
+	chip->pcm = NULL;
+	snd_pcm_lib_preallocate_free_for_all(pcm);
+}
+
+static int __devinit
+snd_ad1889_pcm_init(struct snd_ad1889 *chip, int device, snd_pcm_t **rpcm)
+{
+	int err;
+	snd_pcm_t *pcm;
+
+	if (rpcm)
+		*rpcm = NULL;
+
+	err = snd_pcm_new(chip->card, chip->card->driver, device, 1, 1, &pcm);
+	if (err < 0)
+		return err;
+
+	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, 
+			&snd_ad1889_playback_ops);
+	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
+			&snd_ad1889_capture_ops);
+
+	pcm->private_data = chip;
+	pcm->private_free = snd_ad1889_pcm_free;
+	pcm->info_flags = 0;
+	strcpy(pcm->name, chip->card->shortname);
+	
+	chip->pcm = pcm;
+	chip->psubs = NULL;
+	chip->csubs = NULL;
+
+	err = snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
+						snd_dma_pci_data(chip->pci),
+						BUFFER_BYTES_MAX / 2,
+						BUFFER_BYTES_MAX);
+
+	if (err < 0) {
+		snd_printk(KERN_ERR PFX "buffer allocation error: %d\n", err);
+		return err;
+	}
+	
+	if (rpcm)
+		*rpcm = pcm;
+	
+	return 0;
+}
+
+static void
+snd_ad1889_proc_read(snd_info_entry_t *entry, snd_info_buffer_t *buffer)
+{
+	struct snd_ad1889 *chip = entry->private_data;
+	u16 reg;
+	int tmp;
+
+	reg = ad1889_readw(chip, AD_DS_WSMC);
+	snd_iprintf(buffer, "Wave output: %s\n",
+			(reg & AD_DS_WSMC_WAEN) ? "enabled" : "disabled");
+	snd_iprintf(buffer, "Wave Channels: %s\n",
+			(reg & AD_DS_WSMC_WAST) ? "stereo" : "mono");
+	snd_iprintf(buffer, "Wave Quality: %d-bit linear\n",
+			(reg & AD_DS_WSMC_WA16) ? 16 : 8);
+	
+	/* WARQ is at offset 12 */
+	tmp = (reg & AD_DS_WSMC_WARQ) ?
+			(((reg & AD_DS_WSMC_WARQ >> 12) & 0x01) ? 12 : 18) : 4;
+	tmp /= (reg & AD_DS_WSMC_WAST) ? 2 : 1;
+	
+	snd_iprintf(buffer, "Wave FIFO: %d %s words\n\n", tmp,
+			(reg & AD_DS_WSMC_WAST) ? "stereo" : "mono");
+				
+	
+	snd_iprintf(buffer, "Synthesis output: %s\n",
+			reg & AD_DS_WSMC_SYEN ? "enabled" : "disabled");
+	
+	/* SYRQ is at offset 4 */
+	tmp = (reg & AD_DS_WSMC_SYRQ) ?
+			(((reg & AD_DS_WSMC_SYRQ >> 4) & 0x01) ? 12 : 18) : 4;
+	tmp /= (reg & AD_DS_WSMC_WAST) ? 2 : 1;
+	
+	snd_iprintf(buffer, "Synthesis FIFO: %d %s words\n\n", tmp,
+			(reg & AD_DS_WSMC_WAST) ? "stereo" : "mono");
+
+	reg = ad1889_readw(chip, AD_DS_RAMC);
+	snd_iprintf(buffer, "ADC input: %s\n",
+			(reg & AD_DS_RAMC_ADEN) ? "enabled" : "disabled");
+	snd_iprintf(buffer, "ADC Channels: %s\n",
+			(reg & AD_DS_RAMC_ADST) ? "stereo" : "mono");
+	snd_iprintf(buffer, "ADC Quality: %d-bit linear\n",
+			(reg & AD_DS_RAMC_AD16) ? 16 : 8);
+	
+	/* ACRQ is at offset 4 */
+	tmp = (reg & AD_DS_RAMC_ACRQ) ?
+			(((reg & AD_DS_RAMC_ACRQ >> 4) & 0x01) ? 12 : 18) : 4;
+	tmp /= (reg & AD_DS_RAMC_ADST) ? 2 : 1;
+	
+	snd_iprintf(buffer, "ADC FIFO: %d %s words\n\n", tmp,
+			(reg & AD_DS_RAMC_ADST) ? "stereo" : "mono");
+	
+	snd_iprintf(buffer, "Resampler input: %s\n",
+			reg & AD_DS_RAMC_REEN ? "enabled" : "disabled");
+			
+	/* RERQ is at offset 12 */
+	tmp = (reg & AD_DS_RAMC_RERQ) ?
+			(((reg & AD_DS_RAMC_RERQ >> 12) & 0x01) ? 12 : 18) : 4;
+	tmp /= (reg & AD_DS_RAMC_ADST) ? 2 : 1;
+	
+	snd_iprintf(buffer, "Resampler FIFO: %d %s words\n\n", tmp,
+			(reg & AD_DS_WSMC_WAST) ? "stereo" : "mono");
+				
+	
+	/* doc says LSB represents -1.5dB, but the max value (-94.5dB)
+	suggests that LSB is -3dB, which is more coherent with the logarithmic
+	nature of the dB scale */
+	reg = ad1889_readw(chip, AD_DS_WADA);
+	snd_iprintf(buffer, "Left: %s, -%d dB\n",
+			(reg & AD_DS_WADA_LWAM) ? "mute" : "unmute",
+			((reg & AD_DS_WADA_LWAA) >> 8) * 3);
+	reg = ad1889_readw(chip, AD_DS_WADA);
+	snd_iprintf(buffer, "Right: %s, -%d dB\n",
+			(reg & AD_DS_WADA_RWAM) ? "mute" : "unmute",
+			((reg & AD_DS_WADA_RWAA) >> 8) * 3);
+	
+	reg = ad1889_readw(chip, AD_DS_WAS);
+	snd_iprintf(buffer, "Wave samplerate: %u Hz\n", reg);
+	reg = ad1889_readw(chip, AD_DS_RES);
+	snd_iprintf(buffer, "Resampler samplerate: %u Hz\n", reg);
+}
+
+static void __devinit
+snd_ad1889_proc_init(struct snd_ad1889 *chip)
+{
+	snd_info_entry_t *entry;
+
+	if (!snd_card_proc_new(chip->card, chip->card->driver, &entry))
+		snd_info_set_text_ops(entry, chip, 1024, snd_ad1889_proc_read);
+}
+
+static struct ac97_quirk ac97_quirks[] = {
+	{
+		.subvendor = 0x11d4,	/* AD */
+		.subdevice = 0x1889,	/* AD1889 */
+		.codec_id = AC97_ID_AD1819,
+		.name = "AD1889",
+		.type = AC97_TUNE_HP_ONLY
+	},
+	{ } /* terminator */
+};
+
+static void __devinit
+snd_ad1889_ac97_xinit(struct snd_ad1889 *chip)
+{
+	u16 reg;
+
+	reg = ad1889_readw(chip, AD_AC97_ACIC);
+	reg |= AD_AC97_ACIC_ACRD;		/* Reset Disable */
+	ad1889_writew(chip, AD_AC97_ACIC, reg);
+	ad1889_readw(chip, AD_AC97_ACIC);	/* flush posted write */
+	udelay(10);
+	/* Interface Enable */
+	reg |= AD_AC97_ACIC_ACIE;
+	ad1889_writew(chip, AD_AC97_ACIC, reg);
+	
+	snd_ad1889_ac97_ready(chip);
+
+	/* Audio Stream Output | Variable Sample Rate Mode */
+	reg = ad1889_readw(chip, AD_AC97_ACIC);
+	reg |= AD_AC97_ACIC_ASOE | AD_AC97_ACIC_VSRM;
+	ad1889_writew(chip, AD_AC97_ACIC, reg);
+	ad1889_readw(chip, AD_AC97_ACIC); /* flush posted write */
+
+}
+
+static void
+snd_ad1889_ac97_bus_free(ac97_bus_t *bus)
+{
+	struct snd_ad1889 *chip = bus->private_data;
+	chip->ac97_bus = NULL;
+}
+
+static void
+snd_ad1889_ac97_free(ac97_t *ac97)
+{
+	struct snd_ad1889 *chip = ac97->private_data;
+	chip->ac97 = NULL;
+}
+
+static int __devinit
+snd_ad1889_ac97_init(struct snd_ad1889 *chip, const char *quirk_override)
+{
+	int err;
+	ac97_template_t ac97;
+	static ac97_bus_ops_t ops = {
+		.write = snd_ad1889_ac97_write,
+		.read = snd_ad1889_ac97_read,
+	};
+
+	/* doing that here, it works. */
+	snd_ad1889_ac97_xinit(chip);
+
+	err = snd_ac97_bus(chip->card, 0, &ops, chip, &chip->ac97_bus);
+	if (err < 0)
+		return err;
+	
+	chip->ac97_bus->private_free = snd_ad1889_ac97_bus_free;
+
+	memset(&ac97, 0, sizeof(ac97));
+	ac97.private_data = chip;
+	ac97.private_free = snd_ad1889_ac97_free;
+	ac97.pci = chip->pci;
+
+	err = snd_ac97_mixer(chip->ac97_bus, &ac97, &chip->ac97);
+	if (err < 0)
+		return err;
+		
+	snd_ac97_tune_hardware(chip->ac97, ac97_quirks, quirk_override);
+	
+	return 0;
+}
+
+static int
+snd_ad1889_free(struct snd_ad1889 *chip)
+{
+	if (chip->irq < 0)
+		goto skip_hw;
+
+	spin_lock_irq(&chip->lock);
+
+	ad1889_mute(chip);
+
+	/* Turn off interrupt on count and zero DMA registers */
+	ad1889_channel_reset(chip, AD_CHAN_WAV | AD_CHAN_ADC);
+
+	/* clear DISR. If we don't, we'd better jump off the Eiffel Tower */
+	ad1889_writel(chip, AD_DMA_DISR, AD_DMA_DISR_PTAI | AD_DMA_DISR_PMAI);
+	ad1889_readl(chip, AD_DMA_DISR);	/* flush, dammit! */
+
+	spin_unlock_irq(&chip->lock);
+
+	synchronize_irq(chip->irq);
+	
+	if (chip->irq >= 0)
+		free_irq(chip->irq, (void*)chip);
+
+skip_hw:
+	if (chip->iobase)
+		iounmap(chip->iobase);
+
+	pci_release_regions(chip->pci);
+	pci_disable_device(chip->pci);
+
+	kfree(chip);
+	return 0;
+}
+
+static inline int
+snd_ad1889_dev_free(snd_device_t *device) 
+{
+	struct snd_ad1889 *chip = device->device_data;
+	return snd_ad1889_free(chip);
+}
+
+static int __devinit
+snd_ad1889_init(struct snd_ad1889 *chip) 
+{
+	ad1889_writew(chip, AD_DS_CCS, AD_DS_CCS_CLKEN); /* turn on clock */
+	ad1889_readw(chip, AD_DS_CCS);	/* flush posted write */
+
+	mdelay(10);
+
+	/* enable Master and Target abort interrupts */
+	ad1889_writel(chip, AD_DMA_DISR, AD_DMA_DISR_PMAE | AD_DMA_DISR_PTAE);
+
+	return 0;
+}
+
+static int __devinit
+snd_ad1889_create(snd_card_t *card,
+		  struct pci_dev *pci,
+		  struct snd_ad1889 **rchip)
+{
+	int err;
+
+	struct snd_ad1889 *chip;
+	static snd_device_ops_t ops = {
+		.dev_free = snd_ad1889_dev_free,
+	};
+
+	*rchip = NULL;
+
+	if ((err = pci_enable_device(pci)) < 0)
+		return err;
+	
+	/* check PCI availability (32bit DMA) */
+	if (pci_set_dma_mask(pci, 0xffffffff) < 0 ||
+	    pci_set_consistent_dma_mask(pci, 0xffffffff) < 0) {
+		printk(KERN_ERR PFX "error setting 32-bit DMA mask.\n");
+		pci_disable_device(pci);
+		return -ENXIO;
+	}
+
+	/* allocate chip specific data with zero-filled memory */
+	if ((chip = kcalloc(1, sizeof(*chip), GFP_KERNEL)) == NULL) {
+		pci_disable_device(pci);
+		return -ENOMEM;
+	}
+
+	chip->card = card;
+	card->private_data = chip;
+	chip->pci = pci;
+	chip->irq = -1;
+
+	/* (1) PCI resource allocation */
+	if ((err = pci_request_regions(pci, card->driver)) < 0)
+		goto free_and_ret;
+
+	chip->bar = pci_resource_start(pci, 0);
+	chip->iobase = ioremap_nocache(chip->bar, pci_resource_len(pci, 0));
+	if (chip->iobase == NULL) {
+		printk(KERN_ERR PFX "unable to reserve region.\n");
+		err = -EBUSY;
+		goto free_and_ret;
+	}
+	
+	pci_set_master(pci);
+
+	spin_lock_init(&chip->lock);	/* only now can we call ad1889_free */
+
+	if (request_irq(pci->irq, snd_ad1889_interrupt,
+			SA_INTERRUPT|SA_SHIRQ, card->driver, (void*)chip)) {
+		printk(KERN_ERR PFX "cannot obtain IRQ %d\n", pci->irq);
+		snd_ad1889_free(chip);
+		return -EBUSY;
+	}
+
+	chip->irq = pci->irq;
+	synchronize_irq(chip->irq);
+
+	/* (2) initialization of the chip hardware */
+	if ((err = snd_ad1889_init(chip)) < 0) {
+		snd_ad1889_free(chip);
+		return err;
+	}
+
+	if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) {
+		snd_ad1889_free(chip);
+		return err;
+	}
+
+	snd_card_set_dev(card, &pci->dev);
+
+	*rchip = chip;
+
+	return 0;
+
+free_and_ret:
+	if (chip)
+		kfree(chip);
+	pci_disable_device(pci);
+
+	return err;
+}
+
+static int __devinit
+snd_ad1889_probe(struct pci_dev *pci,
+		 const struct pci_device_id *pci_id)
+{
+	int err;
+	static int devno;
+	snd_card_t *card;
+	struct snd_ad1889 *chip;
+
+	/* (1) */
+	if (devno >= SNDRV_CARDS)
+		return -ENODEV;
+	if (!enable[devno]) {
+		devno++;
+		return -ENOENT;
+	}
+
+	/* (2) */
+	card = snd_card_new(index[devno], id[devno], THIS_MODULE, 0);
+	/* XXX REVISIT: we can probably allocate chip in this call */
+	if (card == NULL)
+		return -ENOMEM;
+
+	strcpy(card->driver, "AD1889");
+	strcpy(card->shortname, "Analog Devices AD1889");
+
+	/* (3) */
+	err = snd_ad1889_create(card, pci, &chip);
+	if (err < 0)
+		goto free_and_ret;
+
+	/* (4) */
+	sprintf(card->longname, "%s at 0x%lx irq %i",
+		card->shortname, chip->bar, chip->irq);
+
+	/* (5) */
+	/* register AC97 mixer */
+	err = snd_ad1889_ac97_init(chip, ac97_quirk[devno]);
+	if (err < 0)
+		goto free_and_ret;
+	
+	err = snd_ad1889_pcm_init(chip, 0, NULL);
+	if (err < 0)
+		goto free_and_ret;
+
+	/* register proc interface */
+	snd_ad1889_proc_init(chip);
+
+	/* (6) */
+	err = snd_card_register(card);
+	if (err < 0)
+		goto free_and_ret;
+
+	/* (7) */
+	pci_set_drvdata(pci, card);
+
+	devno++;
+	return 0;
+
+free_and_ret:
+	snd_card_free(card);
+	return err;
+}
+
+static void __devexit
+snd_ad1889_remove(struct pci_dev *pci)
+{
+	snd_card_free(pci_get_drvdata(pci));
+	pci_set_drvdata(pci, NULL);
+}
+
+static struct pci_device_id snd_ad1889_ids[] = {
+	{ PCI_DEVICE(PCI_VENDOR_ID_ANALOG_DEVICES, PCI_DEVICE_ID_AD1889JS) },
+	{ 0, },
+};
+MODULE_DEVICE_TABLE(pci, snd_ad1889_ids);
+
+static struct pci_driver ad1889_pci = {
+	.name = "AD1889 Audio",
+	.id_table = snd_ad1889_ids,
+	.probe = snd_ad1889_probe,
+	.remove = __devexit_p(snd_ad1889_remove),
+};
+
+static int __init
+alsa_ad1889_init(void)
+{
+	return pci_register_driver(&ad1889_pci);
+}
+
+static void __exit
+alsa_ad1889_fini(void)
+{
+	pci_unregister_driver(&ad1889_pci);
+}
+
+module_init(alsa_ad1889_init);
+module_exit(alsa_ad1889_fini);