[ALSA] Add snd-als300 driver for Avance Logic ALS300/ALS300+ soundcards

Added snd-als300 driver for Avance Logic ALS300/ALS300+ soundcards
by Ash Willis.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

3 files changed, 880 insertions, 0 deletions

diff --git a/sound/pci/Kconfig b/sound/pci/Kconfig
index 933ce36a0bbb..a2081803a827 100644
--- a/sound/pci/Kconfig
+++ b/sound/pci/Kconfig
@@ -15,6 +15,18 @@ config SND_AD1889
           To compile this as a module, choose M here: the module
           will be called snd-ad1889.
 
+config SND_ALS300
+        tristate "Avance Logic ALS300/ALS300+"
+        depends on SND
+        select SND_PCM
+        select SND_AC97_CODEC
+        select SND_OPL3_LIB
+        help
+          Say 'Y' or 'M' to include support for Avance Logic ALS300/ALS300+
+
+          To compile this driver as a module, choose M here: the module
+          will be called snd-als300
+
 config SND_ALS4000
         tristate "Avance Logic ALS4000"
         depends on SND && ISA_DMA_API
diff --git a/sound/pci/Makefile b/sound/pci/Makefile
index daa4253ed65f..cba5105aafea 100644
--- a/sound/pci/Makefile
+++ b/sound/pci/Makefile
@@ -4,6 +4,7 @@
 #
 
 snd-ad1889-objs := ad1889.o
+snd-als300-objs := als300.o
 snd-als4000-objs := als4000.o
 snd-atiixp-objs := atiixp.o
 snd-atiixp-modem-objs := atiixp_modem.o
@@ -27,6 +28,7 @@ snd-via82xx-modem-objs := via82xx_modem.o
 
 # Toplevel Module Dependency
 obj-$(CONFIG_SND_AD1889) += snd-ad1889.o
+obj-$(CONFIG_SND_ALS300) += snd-als300.o
 obj-$(CONFIG_SND_ALS4000) += snd-als4000.o
 obj-$(CONFIG_SND_ATIIXP) += snd-atiixp.o
 obj-$(CONFIG_SND_ATIIXP_MODEM) += snd-atiixp-modem.o
diff --git a/sound/pci/als300.c b/sound/pci/als300.c
new file mode 100644
index 000000000000..37b80570a5c6
--- /dev/null
+++ b/sound/pci/als300.c
@@ -0,0 +1,866 @@
+/*
+ *  als300.c - driver for Avance Logic ALS300/ALS300+ soundcards.
+ *  Copyright (C) 2005 by Ash Willis <ashwillis@programmer.net>
+ *
+ *  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., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ *
+ *  TODO
+ *  4 channel playback for ALS300+
+ *  gameport
+ *  mpu401
+ *  opl3
+ *
+ *  NOTES
+ *  The BLOCK_COUNTER registers for the ALS300(+) return a figure related to
+ *  the position in the current period, NOT the whole buffer. It is important
+ *  to know which period we are in so we can calculate the correct pointer.
+ *  This is why we always use 2 periods. We can then use a flip-flop variable
+ *  to keep track of what period we are in.
+ */
+
+#include <sound/driver.h>
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/moduleparam.h>
+#include <linux/pci.h>
+#include <linux/interrupt.h>
+#include <linux/slab.h>
+
+#include <asm/io.h>
+
+#include <sound/core.h>
+#include <sound/control.h>
+#include <sound/initval.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/ac97_codec.h>
+#include <sound/opl3.h>
+
+/* snd_als300_set_irq_flag */
+#define IRQ_DISABLE             0
+#define IRQ_ENABLE              1
+
+/* I/O port layout */
+#define AC97_ACCESS             0x00
+#define AC97_READ               0x04
+#define AC97_STATUS             0x06
+#define   AC97_DATA_AVAIL               (1<<6)
+#define   AC97_BUSY                     (1<<7)
+#define ALS300_IRQ_STATUS       0x07            /* ALS300 Only */
+#define   IRQ_PLAYBACK                  (1<<3)
+#define   IRQ_CAPTURE                   (1<<2)
+#define GCR_DATA                0x08
+#define GCR_INDEX               0x0C
+#define ALS300P_DRAM_IRQ_STATUS 0x0D            /* ALS300+ Only */
+#define MPU_IRQ_STATUS          0x0E            /* ALS300 Rev. E+, ALS300+ */
+#define ALS300P_IRQ_STATUS      0x0F            /* ALS300+ Only */
+
+/* General Control Registers */
+#define PLAYBACK_START          0x80
+#define PLAYBACK_END            0x81
+#define PLAYBACK_CONTROL        0x82
+#define   TRANSFER_START                (1<<16)
+#define   FIFO_PAUSE                    (1<<17)
+#define RECORD_START            0x83
+#define RECORD_END              0x84
+#define RECORD_CONTROL          0x85
+#define DRAM_WRITE_CONTROL      0x8B
+#define   WRITE_TRANS_START             (1<<16)
+#define   DRAM_MODE_2                   (1<<17)
+#define MISC_CONTROL            0x8C
+#define   IRQ_SET_BIT                   (1<<15)
+#define   VMUTE_NORMAL                  (1<<20)
+#define   MMUTE_NORMAL                  (1<<21)
+#define MUS_VOC_VOL             0x8E
+#define PLAYBACK_BLOCK_COUNTER  0x9A
+#define RECORD_BLOCK_COUNTER    0x9B
+
+#define DEBUG_CALLS     1
+#define DEBUG_PLAY_REC  1
+
+#if DEBUG_CALLS
+#define snd_als300_dbgcalls(format, args...) printk(format, ##args)
+#define snd_als300_dbgcallenter() printk(KERN_ERR "--> %s\n", __FUNCTION__)
+#define snd_als300_dbgcallleave() printk(KERN_ERR "<-- %s\n", __FUNCTION__)
+#else
+#define snd_als300_dbgcalls(format, args...)
+#define snd_als300_dbgcallenter()
+#define snd_als300_dbgcallleave()
+#endif
+
+#if DEBUG_PLAY_REC
+#define snd_als300_dbgplay(format, args...) printk(KERN_ERR format, ##args)
+#else
+#define snd_als300_dbgplay(format, args...)
+#endif          
+
+enum {DEVICE_ALS300, DEVICE_ALS300_PLUS};
+
+MODULE_AUTHOR("Ash Willis <ashwillis@programmer.net>");
+MODULE_DESCRIPTION("Avance Logic ALS300");
+MODULE_LICENSE("GPL");
+MODULE_SUPPORTED_DEVICE("{{Avance Logic,ALS300},{Avance Logic,ALS300+}}");
+
+static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
+static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;
+static int enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;
+
+struct snd_als300 {
+        unsigned long port;
+        spinlock_t reg_lock;
+        struct snd_card *card;
+        struct pci_dev *pci;
+
+        struct snd_pcm *pcm;
+        struct snd_pcm_substream *playback_substream;
+        struct snd_pcm_substream *capture_substream;
+
+        struct snd_ac97 *ac97;
+        struct snd_opl3 *opl3;
+
+        struct resource *res_port;
+
+        int irq;
+
+        int chip_type; /* ALS300 or ALS300+ */
+
+        char revision;  
+};
+
+struct snd_als300_substream_data {
+        int period_flipflop;
+        int control_register;
+        int block_counter_register;
+};
+
+static struct pci_device_id snd_als300_ids[] = {
+        { 0x4005, 0x0300, PCI_ANY_ID, PCI_ANY_ID, 0, 0, DEVICE_ALS300 },
+        { 0x4005, 0x0308, PCI_ANY_ID, PCI_ANY_ID, 0, 0, DEVICE_ALS300_PLUS },
+        { 0, }
+};
+
+MODULE_DEVICE_TABLE(pci, snd_als300_ids);
+
+static inline u32 snd_als300_gcr_read(unsigned long port, unsigned short reg)
+{
+        outb(reg, port+GCR_INDEX);
+        return inl(port+GCR_DATA);
+}
+
+static inline void snd_als300_gcr_write(unsigned long port,
+                                                unsigned short reg, u32 val)
+{
+        outb(reg, port+GCR_INDEX);
+        outl(val, port+GCR_DATA);
+}
+
+/* Enable/Disable Interrupts */
+static void snd_als300_set_irq_flag(struct snd_als300 *chip, int cmd)
+{
+        u32 tmp = snd_als300_gcr_read(chip->port, MISC_CONTROL);
+        snd_als300_dbgcallenter();
+
+        /* boolean XOR check, since old vs. new hardware have
+           directly reversed bit setting for ENABLE and DISABLE.
+           ALS300+ acts like newer versions of ALS300 */
+        if (((chip->revision > 5 || chip->chip_type == DEVICE_ALS300_PLUS) ^
+                                                (cmd == IRQ_ENABLE)) == 0)
+                tmp |= IRQ_SET_BIT;
+        else
+                tmp &= ~IRQ_SET_BIT;
+        snd_als300_gcr_write(chip->port, MISC_CONTROL, tmp);
+        snd_als300_dbgcallleave();
+}
+
+static int snd_als300_free(struct snd_als300 *chip)
+{
+        snd_als300_dbgcallenter();
+        snd_als300_set_irq_flag(chip, IRQ_DISABLE);
+        if (chip->irq >= 0)
+                free_irq(chip->irq, (void *)chip);
+        pci_release_regions(chip->pci);
+        pci_disable_device(chip->pci);
+        kfree(chip);
+        snd_als300_dbgcallleave();
+        return 0;
+}
+
+static int snd_als300_dev_free(struct snd_device *device)
+{
+        struct snd_als300 *chip = device->device_data;
+        return snd_als300_free(chip);
+}
+
+static irqreturn_t snd_als300_interrupt(int irq, void *dev_id,
+                                                struct pt_regs *regs)
+{
+        u8 status;
+        struct snd_als300 *chip = dev_id;
+        struct snd_als300_substream_data *data;
+
+        status = inb(chip->port+ALS300_IRQ_STATUS);
+        if (!status) /* shared IRQ, for different device?? Exit ASAP! */
+                return IRQ_NONE;
+
+        /* ACK everything ASAP */
+        outb(status, chip->port+ALS300_IRQ_STATUS);
+        if (status & IRQ_PLAYBACK) {
+                if (chip->pcm && chip->playback_substream) {
+                        data = chip->playback_substream->runtime->private_data;
+                        data->period_flipflop ^= 1;
+                        snd_pcm_period_elapsed(chip->playback_substream);
+                        snd_als300_dbgplay("IRQ_PLAYBACK\n");
+                }
+        }
+        if (status & IRQ_CAPTURE) {
+                if (chip->pcm && chip->capture_substream) {
+                        data = chip->capture_substream->runtime->private_data;
+                        data->period_flipflop ^= 1;
+                        snd_pcm_period_elapsed(chip->capture_substream);
+                        snd_als300_dbgplay("IRQ_CAPTURE\n");
+                }
+        }
+        return IRQ_HANDLED;
+}
+
+static irqreturn_t snd_als300plus_interrupt(int irq, void *dev_id,
+                                                struct pt_regs *regs)
+{
+        u8 general, mpu, dram;
+        struct snd_als300 *chip = dev_id;
+        struct snd_als300_substream_data *data;
+        
+        general = inb(chip->port+ALS300P_IRQ_STATUS);
+        mpu = inb(chip->port+MPU_IRQ_STATUS);
+        dram = inb(chip->port+ALS300P_DRAM_IRQ_STATUS);
+
+        /* shared IRQ, for different device?? Exit ASAP! */
+        if ((general == 0) && ((mpu & 0x80) == 0) && ((dram & 0x01) == 0))
+                return IRQ_NONE;
+
+        if (general & IRQ_PLAYBACK) {
+                if (chip->pcm && chip->playback_substream) {
+                        outb(IRQ_PLAYBACK, chip->port+ALS300P_IRQ_STATUS);
+                        data = chip->playback_substream->runtime->private_data;
+                        data->period_flipflop ^= 1;
+                        snd_pcm_period_elapsed(chip->playback_substream);
+                        snd_als300_dbgplay("IRQ_PLAYBACK\n");
+                }
+        }
+        if (general & IRQ_CAPTURE) {
+                if (chip->pcm && chip->capture_substream) {
+                        outb(IRQ_CAPTURE, chip->port+ALS300P_IRQ_STATUS);
+                        data = chip->capture_substream->runtime->private_data;
+                        data->period_flipflop ^= 1;
+                        snd_pcm_period_elapsed(chip->capture_substream);
+                        snd_als300_dbgplay("IRQ_CAPTURE\n");
+                }
+        }
+        /* FIXME: Ack other interrupt types. Not important right now as
+         * those other devices aren't enabled. */
+        return IRQ_HANDLED;
+}
+
+static void __devexit snd_als300_remove(struct pci_dev *pci)
+{
+        snd_als300_dbgcallenter();
+        snd_card_free(pci_get_drvdata(pci));
+        pci_set_drvdata(pci, NULL);
+        snd_als300_dbgcallleave();
+}
+
+static unsigned short snd_als300_ac97_read(struct snd_ac97 *ac97,
+                                                        unsigned short reg)
+{
+        int i;
+        struct snd_als300 *chip = ac97->private_data;
+
+        for (i = 0; i < 1000; i++) {
+                if ((inb(chip->port+AC97_STATUS) & (AC97_BUSY)) == 0)
+                        break;
+                udelay(10);
+        }
+        outl((reg << 24) | (1 << 31), chip->port+AC97_ACCESS);
+
+        for (i = 0; i < 1000; i++) {
+                if ((inb(chip->port+AC97_STATUS) & (AC97_DATA_AVAIL)) != 0)
+                        break;
+                udelay(10);
+        }
+        return inw(chip->port+AC97_READ);
+}
+
+static void snd_als300_ac97_write(struct snd_ac97 *ac97,
+                                unsigned short reg, unsigned short val)
+{
+        int i;
+        struct snd_als300 *chip = ac97->private_data;
+
+        for (i = 0; i < 1000; i++) {
+                if ((inb(chip->port+AC97_STATUS) & (AC97_BUSY)) == 0)
+                        break;
+                udelay(10);
+        }
+        outl((reg << 24) | val, chip->port+AC97_ACCESS);
+}
+
+static int snd_als300_ac97(struct snd_als300 *chip)
+{
+        struct snd_ac97_bus *bus;
+        struct snd_ac97_template ac97;
+        int err;
+        static struct snd_ac97_bus_ops ops = {
+                .write = snd_als300_ac97_write,
+                .read = snd_als300_ac97_read,
+        };
+
+        snd_als300_dbgcallenter();
+        if ((err = snd_ac97_bus(chip->card, 0, &ops, NULL, &bus)) < 0)
+                return err;
+
+        memset(&ac97, 0, sizeof(ac97));
+        ac97.private_data = chip;
+
+        snd_als300_dbgcallleave();
+        return snd_ac97_mixer(bus, &ac97, &chip->ac97);
+}
+
+/* hardware definition
+ *
+ * In AC97 mode, we always use 48k/16bit/stereo.
+ * Any request to change data type is ignored by
+ * the card when it is running outside of legacy
+ * mode.
+ */
+static struct snd_pcm_hardware snd_als300_playback_hw =
+{
+        .info =                 (SNDRV_PCM_INFO_MMAP |
+                                SNDRV_PCM_INFO_INTERLEAVED |
+                                SNDRV_PCM_INFO_PAUSE |
+                                SNDRV_PCM_INFO_MMAP_VALID),
+        .formats =              SNDRV_PCM_FMTBIT_S16,
+        .rates =                SNDRV_PCM_RATE_48000,
+        .rate_min =             48000,
+        .rate_max =             48000,
+        .channels_min =         2,
+        .channels_max =         2,
+        .buffer_bytes_max =     64 * 1024,
+        .period_bytes_min =     64,
+        .period_bytes_max =     32 * 1024,
+        .periods_min =          2,
+        .periods_max =          2,
+};
+
+static struct snd_pcm_hardware snd_als300_capture_hw =
+{
+        .info =                 (SNDRV_PCM_INFO_MMAP |
+                                SNDRV_PCM_INFO_INTERLEAVED |
+                                SNDRV_PCM_INFO_PAUSE |
+                                SNDRV_PCM_INFO_MMAP_VALID),
+        .formats =              SNDRV_PCM_FMTBIT_S16,
+        .rates =                SNDRV_PCM_RATE_48000,
+        .rate_min =             48000,
+        .rate_max =             48000,
+        .channels_min =         2,
+        .channels_max =         2,
+        .buffer_bytes_max =     64 * 1024,
+        .period_bytes_min =     64,
+        .period_bytes_max =     32 * 1024,
+        .periods_min =          2,
+        .periods_max =          2,
+};
+
+static int snd_als300_playback_open(struct snd_pcm_substream *substream)
+{
+        struct snd_als300 *chip = snd_pcm_substream_chip(substream);
+        struct snd_pcm_runtime *runtime = substream->runtime;
+        struct snd_als300_substream_data *data = kzalloc(sizeof(*data),
+                                                                GFP_KERNEL);
+
+        snd_als300_dbgcallenter();
+        chip->playback_substream = substream;
+        runtime->hw = snd_als300_playback_hw;
+        runtime->private_data = data;
+        data->control_register = PLAYBACK_CONTROL;
+        data->block_counter_register = PLAYBACK_BLOCK_COUNTER;
+        snd_als300_dbgcallleave();
+        return 0;
+}
+
+static int snd_als300_playback_close(struct snd_pcm_substream *substream)
+{
+        struct snd_als300 *chip = snd_pcm_substream_chip(substream);
+        struct snd_als300_substream_data *data;
+
+        data = substream->runtime->private_data;
+        snd_als300_dbgcallenter();
+        kfree(data);
+        chip->playback_substream = NULL;
+        snd_pcm_lib_free_pages(substream);
+        snd_als300_dbgcallleave();
+        return 0;
+}
+
+static int snd_als300_capture_open(struct snd_pcm_substream *substream)
+{
+        struct snd_als300 *chip = snd_pcm_substream_chip(substream);
+        struct snd_pcm_runtime *runtime = substream->runtime;
+        struct snd_als300_substream_data *data = kzalloc(sizeof(*data),
+                                                                GFP_KERNEL);
+
+        snd_als300_dbgcallenter();
+        chip->capture_substream = substream;
+        runtime->hw = snd_als300_capture_hw;
+        runtime->private_data = data;
+        data->control_register = RECORD_CONTROL;
+        data->block_counter_register = RECORD_BLOCK_COUNTER;
+        snd_als300_dbgcallleave();
+        return 0;
+}
+
+static int snd_als300_capture_close(struct snd_pcm_substream *substream)
+{
+        struct snd_als300 *chip = snd_pcm_substream_chip(substream);
+        struct snd_als300_substream_data *data;
+
+        data = substream->runtime->private_data;
+        snd_als300_dbgcallenter();
+        kfree(data);
+        chip->capture_substream = NULL;
+        snd_pcm_lib_free_pages(substream);
+        snd_als300_dbgcallleave();
+        return 0;
+}
+
+static int snd_als300_pcm_hw_params(struct snd_pcm_substream *substream,
+                                        snd_pcm_hw_params_t * hw_params)
+{
+        return snd_pcm_lib_malloc_pages(substream,
+                                        params_buffer_bytes(hw_params));
+}
+
+static int snd_als300_pcm_hw_free(struct snd_pcm_substream *substream)
+{
+        return snd_pcm_lib_free_pages(substream);
+}
+
+static int snd_als300_playback_prepare(struct snd_pcm_substream *substream)
+{
+        u32 tmp;
+        struct snd_als300 *chip = snd_pcm_substream_chip(substream);
+        struct snd_pcm_runtime *runtime = substream->runtime;
+        unsigned short period_bytes = snd_pcm_lib_period_bytes(substream);
+        unsigned short buffer_bytes = snd_pcm_lib_buffer_bytes(substream);
+        
+        snd_als300_dbgcallenter();
+        spin_lock_irq(&chip->reg_lock);
+        tmp = snd_als300_gcr_read(chip->port, PLAYBACK_CONTROL);
+        tmp &= ~TRANSFER_START;
+
+        snd_als300_dbgplay("Period bytes: %d Buffer bytes %d\n",
+                                                period_bytes, buffer_bytes);
+        
+        /* set block size */
+        tmp &= 0xffff0000;
+        tmp |= period_bytes - 1;
+        snd_als300_gcr_write(chip->port, PLAYBACK_CONTROL, tmp);
+
+        /* set dma area */
+        snd_als300_gcr_write(chip->port, PLAYBACK_START,
+                                        runtime->dma_addr);
+        snd_als300_gcr_write(chip->port, PLAYBACK_END,
+                                        runtime->dma_addr + buffer_bytes - 1);
+        spin_unlock_irq(&chip->reg_lock);
+        snd_als300_dbgcallleave();
+        return 0;
+}
+
+static int snd_als300_capture_prepare(struct snd_pcm_substream *substream)
+{
+        u32 tmp;
+        struct snd_als300 *chip = snd_pcm_substream_chip(substream);
+        struct snd_pcm_runtime *runtime = substream->runtime;
+        unsigned short period_bytes = snd_pcm_lib_period_bytes(substream);
+        unsigned short buffer_bytes = snd_pcm_lib_buffer_bytes(substream);
+
+        snd_als300_dbgcallenter();
+        spin_lock_irq(&chip->reg_lock);
+        tmp = snd_als300_gcr_read(chip->port, RECORD_CONTROL);
+        tmp &= ~TRANSFER_START;
+
+        snd_als300_dbgplay("Period bytes: %d Buffer bytes %d\n", period_bytes,
+                                                        buffer_bytes);
+
+        /* set block size */
+        tmp &= 0xffff0000;
+        tmp |= period_bytes - 1;
+
+        /* set dma area */
+        snd_als300_gcr_write(chip->port, RECORD_CONTROL, tmp);
+        snd_als300_gcr_write(chip->port, RECORD_START,
+                                        runtime->dma_addr);
+        snd_als300_gcr_write(chip->port, RECORD_END,
+                                        runtime->dma_addr + buffer_bytes - 1);
+        spin_unlock_irq(&chip->reg_lock);
+        snd_als300_dbgcallleave();
+        return 0;
+}
+
+static int snd_als300_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+        struct snd_als300 *chip = snd_pcm_substream_chip(substream);
+        u32 tmp;
+        struct snd_als300_substream_data *data;
+        unsigned short reg;
+        int ret = 0;
+
+        data = substream->runtime->private_data;
+        reg = data->control_register;
+
+        snd_als300_dbgcallenter();
+        spin_lock(&chip->reg_lock);
+        switch (cmd) {
+        case SNDRV_PCM_TRIGGER_START:
+        case SNDRV_PCM_TRIGGER_RESUME:
+                tmp = snd_als300_gcr_read(chip->port, reg);
+                data->period_flipflop = 1;
+                snd_als300_gcr_write(chip->port, reg, tmp | TRANSFER_START);
+                snd_als300_dbgplay("TRIGGER START\n");
+                break;
+        case SNDRV_PCM_TRIGGER_STOP:
+        case SNDRV_PCM_TRIGGER_SUSPEND:
+                tmp = snd_als300_gcr_read(chip->port, reg);
+                snd_als300_gcr_write(chip->port, reg, tmp & ~TRANSFER_START);
+                snd_als300_dbgplay("TRIGGER STOP\n");
+                break;
+        case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+                tmp = snd_als300_gcr_read(chip->port, reg);
+                snd_als300_gcr_write(chip->port, reg, tmp | FIFO_PAUSE);
+                snd_als300_dbgplay("TRIGGER PAUSE\n");
+                break;
+        case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+                tmp = snd_als300_gcr_read(chip->port, reg);
+                snd_als300_gcr_write(chip->port, reg, tmp & ~FIFO_PAUSE);
+                snd_als300_dbgplay("TRIGGER RELEASE\n");
+                break;
+        default:
+                snd_als300_dbgplay("TRIGGER INVALID\n");
+                ret = -EINVAL;
+        }
+        spin_unlock(&chip->reg_lock);
+        snd_als300_dbgcallleave();
+        return ret;
+}
+
+static snd_pcm_uframes_t snd_als300_pointer(struct snd_pcm_substream *substream)
+{
+        u16 current_ptr;
+        struct snd_als300 *chip = snd_pcm_substream_chip(substream);
+        struct snd_als300_substream_data *data;
+        unsigned short period_bytes;
+
+        data = substream->runtime->private_data;
+        period_bytes = snd_pcm_lib_period_bytes(substream);
+        
+        snd_als300_dbgcallenter();
+        spin_lock(&chip->reg_lock);
+        current_ptr = (u16) snd_als300_gcr_read(chip->port,
+                                        data->block_counter_register) + 4;
+        spin_unlock(&chip->reg_lock);
+        if (current_ptr > period_bytes)
+                current_ptr = 0;
+        else
+                current_ptr = period_bytes - current_ptr;
+
+        if (data->period_flipflop == 0)
+                current_ptr += period_bytes;
+        snd_als300_dbgplay("Pointer (bytes): %d\n", current_ptr);
+        snd_als300_dbgcallleave();
+        return bytes_to_frames(substream->runtime, current_ptr);
+}
+
+static struct snd_pcm_ops snd_als300_playback_ops = {
+        .open =         snd_als300_playback_open,
+        .close =        snd_als300_playback_close,
+        .ioctl =        snd_pcm_lib_ioctl,
+        .hw_params =    snd_als300_pcm_hw_params,
+        .hw_free =      snd_als300_pcm_hw_free,
+        .prepare =      snd_als300_playback_prepare,
+        .trigger =      snd_als300_trigger,
+        .pointer =      snd_als300_pointer,
+};
+
+static struct snd_pcm_ops snd_als300_capture_ops = {
+        .open =         snd_als300_capture_open,
+        .close =        snd_als300_capture_close,
+        .ioctl =        snd_pcm_lib_ioctl,
+        .hw_params =    snd_als300_pcm_hw_params,
+        .hw_free =      snd_als300_pcm_hw_free,
+        .prepare =      snd_als300_capture_prepare,
+        .trigger =      snd_als300_trigger,
+        .pointer =      snd_als300_pointer,
+};
+
+static int __devinit snd_als300_new_pcm(struct snd_als300 *chip)
+{
+        struct snd_pcm *pcm;
+        int err;
+
+        snd_als300_dbgcallenter();
+        err = snd_pcm_new(chip->card, "ALS300", 0, 1, 1, &pcm);
+        if (err < 0)
+                return err;
+        pcm->private_data = chip;
+        strcpy(pcm->name, "ALS300");
+        chip->pcm = pcm;
+
+        /* set operators */
+        snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK,
+                                &snd_als300_playback_ops);
+        snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
+                                &snd_als300_capture_ops);
+
+        /* pre-allocation of buffers */
+        snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV,
+        snd_dma_pci_data(chip->pci), 64*1024, 64*1024);
+        snd_als300_dbgcallleave();
+        return 0;
+}
+
+static void snd_als300_init(struct snd_als300 *chip)
+{
+        unsigned long flags;
+        u32 tmp;
+        
+        snd_als300_dbgcallenter();
+        spin_lock_irqsave(&chip->reg_lock, flags);
+        chip->revision = (snd_als300_gcr_read(chip->port, MISC_CONTROL) >> 16)
+                                                                & 0x0000000F;
+        /* Setup DRAM */
+        tmp = snd_als300_gcr_read(chip->port, DRAM_WRITE_CONTROL);
+        snd_als300_gcr_write(chip->port, DRAM_WRITE_CONTROL,
+                                                (tmp | DRAM_MODE_2)
+                                                & ~WRITE_TRANS_START);
+
+        /* Enable IRQ output */
+        snd_als300_set_irq_flag(chip, IRQ_ENABLE);
+
+        /* Unmute hardware devices so their outputs get routed to
+         * the onboard mixer */
+        tmp = snd_als300_gcr_read(chip->port, MISC_CONTROL);
+        snd_als300_gcr_write(chip->port, MISC_CONTROL,
+                        tmp | VMUTE_NORMAL | MMUTE_NORMAL);
+
+        /* Reset volumes */
+        snd_als300_gcr_write(chip->port, MUS_VOC_VOL, 0);
+
+        /* Make sure playback transfer is stopped */
+        tmp = snd_als300_gcr_read(chip->port, PLAYBACK_CONTROL);
+        snd_als300_gcr_write(chip->port, PLAYBACK_CONTROL,
+                        tmp & ~TRANSFER_START);
+        spin_unlock_irqrestore(&chip->reg_lock, flags);
+        snd_als300_dbgcallleave();
+}
+
+static int __devinit snd_als300_create(snd_card_t *card,
+                                       struct pci_dev *pci, int chip_type,
+                                       struct snd_als300 **rchip)
+{
+        struct snd_als300 *chip;
+        void *irq_handler;
+        int err;
+
+        static snd_device_ops_t ops = {
+                .dev_free = snd_als300_dev_free,
+        };
+        *rchip = NULL;
+
+        snd_als300_dbgcallenter();
+        if ((err = pci_enable_device(pci)) < 0)
+                return err;
+
+        if (pci_set_dma_mask(pci, 0x0fffffff) < 0 ||
+                pci_set_consistent_dma_mask(pci, 0x0fffffff) < 0) {
+                printk(KERN_ERR "error setting 28bit DMA mask\n");
+                pci_disable_device(pci);
+                return -ENXIO;
+        }
+        pci_set_master(pci);
+
+        chip = kzalloc(sizeof(*chip), GFP_KERNEL);
+        if (chip == NULL) {
+                pci_disable_device(pci);
+                return -ENOMEM;
+        }
+
+        chip->card = card;
+        chip->pci = pci;
+        chip->irq = -1;
+        chip->chip_type = chip_type;
+        spin_lock_init(&chip->reg_lock);
+
+        if ((err = pci_request_regions(pci, "ALS300")) < 0) {
+                kfree(chip);
+                pci_disable_device(pci);
+                return err;
+        }
+        chip->port = pci_resource_start(pci, 0);
+
+        if (chip->chip_type == DEVICE_ALS300_PLUS)
+                irq_handler = snd_als300plus_interrupt;
+        else
+                irq_handler = snd_als300_interrupt;
+
+        if (request_irq(pci->irq, irq_handler, SA_INTERRUPT|SA_SHIRQ,
+                                        card->shortname, (void *)chip)) {
+                snd_printk(KERN_ERR "unable to grab IRQ %d\n", pci->irq);
+                snd_als300_free(chip);
+                return -EBUSY;
+        }
+        chip->irq = pci->irq;
+
+
+        snd_als300_init(chip);
+
+        if (snd_als300_ac97(chip) < 0) {
+                snd_printk(KERN_WARNING "Could not create ac97\n");
+                snd_als300_free(chip);
+                return err;
+        }
+
+        if ((err = snd_als300_new_pcm(chip)) < 0) {
+                snd_printk(KERN_WARNING "Could not create PCM\n");
+                snd_als300_free(chip);
+                return err;
+        }
+
+        if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL,
+                                                chip, &ops)) < 0) {
+                snd_als300_free(chip);
+                return err;
+        }
+
+        snd_card_set_dev(card, &pci->dev);
+
+        *rchip = chip;
+        snd_als300_dbgcallleave();
+        return 0;
+}
+
+#ifdef CONFIG_PM
+static int snd_als300_suspend(struct pci_dev *pci, pm_message_t state)
+{
+        struct snd_card *card = pci_get_drvdata(pci);
+        struct snd_als300 *chip = card->private_data;
+
+        snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
+        snd_pcm_suspend_all(chip->pcm);
+        snd_ac97_suspend(chip->ac97);
+
+        pci_set_power_state(pci, PCI_D3hot);
+        pci_disable_device(pci);
+        pci_save_state(pci);
+        return 0;
+}
+
+static int snd_als300_resume(struct pci_dev *pci)
+{
+        struct snd_card *card = pci_get_drvdata(pci);
+        struct snd_als300 *chip = card->private_data;
+
+        pci_restore_state(pci);
+        pci_enable_device(pci);
+        pci_set_power_state(pci, PCI_D0);
+        pci_set_master(pci);
+
+        snd_als300_init(chip);
+        snd_ac97_resume(chip->ac97);
+
+        snd_power_change_state(card, SNDRV_CTL_POWER_D0);
+        return 0;
+}
+#endif
+
+static int __devinit snd_als300_probe(struct pci_dev *pci,
+                             const struct pci_device_id *pci_id)
+{
+        static int dev;
+        struct snd_card *card;
+        struct snd_als300 *chip;
+        int err, chip_type;
+
+        if (dev >= SNDRV_CARDS)
+                return -ENODEV;
+        if (!enable[dev]) {
+                dev++;
+                return -ENOENT;
+        }
+
+        card = snd_card_new(index[dev], id[dev], THIS_MODULE, 0);
+
+        if (card == NULL)
+                return -ENOMEM;
+
+        chip_type = pci_id->driver_data;
+
+        if ((err = snd_als300_create(card, pci, chip_type, &chip)) < 0) {
+                snd_card_free(card);
+                return err;
+        }
+        card->private_data = chip;
+
+        strcpy(card->driver, "ALS300");
+        if (chip->chip_type == DEVICE_ALS300_PLUS)
+                /* don't know much about ALS300+ yet
+                 * print revision number for now */
+                sprintf(card->shortname, "ALS300+ (Rev. %d)", chip->revision);
+        else
+                sprintf(card->shortname, "ALS300 (Rev. %c)", 'A' +
+                                                        chip->revision - 1);
+        sprintf(card->longname, "%s at 0x%lx irq %i",
+                                card->shortname, chip->port, chip->irq);
+
+        if ((err = snd_card_register(card)) < 0) {
+                snd_card_free(card);
+                return err;
+        }
+        pci_set_drvdata(pci, card);
+        dev++;
+        return 0;
+}
+
+static struct pci_driver driver = {
+        .name = "ALS300",
+        .id_table = snd_als300_ids,
+        .probe = snd_als300_probe,
+        .remove = __devexit_p(snd_als300_remove),
+#ifdef CONFIG_PM
+        .suspend = snd_als300_suspend,
+        .resume = snd_als300_resume,
+#endif
+};
+
+static int __init alsa_card_als300_init(void)
+{
+        return pci_register_driver(&driver);
+}
+
+static void __exit alsa_card_als300_exit(void)
+{
+        pci_unregister_driver(&driver);
+}
+
+module_init(alsa_card_als300_init)
+module_exit(alsa_card_als300_exit)