Linux-2.6.12-rc2v2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 993 insertions, 0 deletions

diff --git a/sound/parisc/harmony.c b/sound/parisc/harmony.c
new file mode 100644
index 000000000000..d7a8f9f5896f
--- /dev/null
+++ b/sound/parisc/harmony.c
@@ -0,0 +1,993 @@
+/* Hewlett-Packard Harmony audio driver
+ *
+ *   This is a driver for the Harmony audio chipset found
+ *   on the LASI ASIC of various early HP PA-RISC workstations.
+ *
+ *   Copyright (C) 2004, Kyle McMartin <kyle@{debian.org,parisc-linux.org}>
+ *
+ *     Based on the previous Harmony incarnations by,
+ *       Copyright 2000 (c) Linuxcare Canada, Alex deVries
+ *       Copyright 2000-2003 (c) Helge Deller
+ *       Copyright 2001 (c) Matthieu Delahaye
+ *       Copyright 2001 (c) Jean-Christophe Vaugeois
+ *       Copyright 2003 (c) Laurent Canet
+ *       Copyright 2004 (c) Stuart Brady
+ *
+ *   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.
+ *
+ * Notes:
+ *   - graveyard and silence buffers last for lifetime of
+ *     the driver. playback and capture buffers are allocated
+ *     per _open()/_close().
+ * 
+ * TODO:
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/time.h>
+#include <linux/wait.h>
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/spinlock.h>
+#include <linux/dma-mapping.h>
+
+#include <sound/driver.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/control.h>
+#include <sound/rawmidi.h>
+#include <sound/initval.h>
+#include <sound/info.h>
+
+#include <asm/io.h>
+#include <asm/hardware.h>
+#include <asm/parisc-device.h>
+
+#include "harmony.h"
+
+static struct parisc_device_id snd_harmony_devtable[] = {
+        /* bushmaster / flounder */
+        { HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x0007A }, 
+        /* 712 / 715 */
+        { HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x0007B }, 
+        /* pace */
+        { HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x0007E }, 
+        /* outfield / coral II */
+        { HPHW_FIO, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x0007F },
+        { 0, }
+};
+
+MODULE_DEVICE_TABLE(parisc, snd_harmony_devtable);
+
+#define NAME "harmony"
+#define PFX  NAME ": "
+
+static unsigned int snd_harmony_rates[] = {
+        5512, 6615, 8000, 9600,
+        11025, 16000, 18900, 22050,
+        27428, 32000, 33075, 37800,
+        44100, 48000
+};
+
+static unsigned int rate_bits[14] = {
+        HARMONY_SR_5KHZ, HARMONY_SR_6KHZ, HARMONY_SR_8KHZ,
+        HARMONY_SR_9KHZ, HARMONY_SR_11KHZ, HARMONY_SR_16KHZ,
+        HARMONY_SR_18KHZ, HARMONY_SR_22KHZ, HARMONY_SR_27KHZ,
+        HARMONY_SR_32KHZ, HARMONY_SR_33KHZ, HARMONY_SR_37KHZ,
+        HARMONY_SR_44KHZ, HARMONY_SR_48KHZ
+};
+
+static snd_pcm_hw_constraint_list_t hw_constraint_rates = {
+        .count = ARRAY_SIZE(snd_harmony_rates),
+        .list = snd_harmony_rates,
+        .mask = 0,
+};
+
+inline unsigned long
+harmony_read(harmony_t *h, unsigned r)
+{
+        return __raw_readl(h->iobase + r);
+}
+
+inline void
+harmony_write(harmony_t *h, unsigned r, unsigned long v)
+{
+        __raw_writel(v, h->iobase + r);
+}
+
+static void
+harmony_wait_for_control(harmony_t *h)
+{
+        while (harmony_read(h, HARMONY_CNTL) & HARMONY_CNTL_C) ;
+}
+
+inline void
+harmony_reset(harmony_t *h)
+{
+        harmony_write(h, HARMONY_RESET, 1);
+        mdelay(50);
+        harmony_write(h, HARMONY_RESET, 0);
+}
+
+static void
+harmony_disable_interrupts(harmony_t *h)
+{
+        u32 dstatus;
+        harmony_wait_for_control(h);
+        dstatus = harmony_read(h, HARMONY_DSTATUS);
+        dstatus &= ~HARMONY_DSTATUS_IE;
+        harmony_write(h, HARMONY_DSTATUS, dstatus);
+}
+
+static void
+harmony_enable_interrupts(harmony_t *h)
+{
+        u32 dstatus;
+        harmony_wait_for_control(h);
+        dstatus = harmony_read(h, HARMONY_DSTATUS);
+        dstatus |= HARMONY_DSTATUS_IE;
+        harmony_write(h, HARMONY_DSTATUS, dstatus);
+}
+
+static void
+harmony_mute(harmony_t *h)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&h->mixer_lock, flags);
+        harmony_wait_for_control(h);
+        harmony_write(h, HARMONY_GAINCTL, HARMONY_GAIN_SILENCE);
+        spin_unlock_irqrestore(&h->mixer_lock, flags);
+}
+
+static void
+harmony_unmute(harmony_t *h)
+{
+        unsigned long flags;
+
+        spin_lock_irqsave(&h->mixer_lock, flags);
+        harmony_wait_for_control(h);
+        harmony_write(h, HARMONY_GAINCTL, h->st.gain);
+        spin_unlock_irqrestore(&h->mixer_lock, flags);
+}
+
+static void
+harmony_set_control(harmony_t *h)
+{
+        u32 ctrl;
+        unsigned long flags;
+
+        spin_lock_irqsave(&h->lock, flags);
+
+        ctrl = (HARMONY_CNTL_C      |
+                (h->st.format << 6) |
+                (h->st.stereo << 5) |
+                (h->st.rate));
+
+        harmony_wait_for_control(h);
+        harmony_write(h, HARMONY_CNTL, ctrl);
+
+        spin_unlock_irqrestore(&h->lock, flags);
+}
+
+static irqreturn_t
+snd_harmony_interrupt(int irq, void *dev, struct pt_regs *regs)
+{
+        u32 dstatus;
+        harmony_t *h = dev;
+
+        spin_lock(&h->lock);
+        harmony_disable_interrupts(h);
+        harmony_wait_for_control(h);
+        dstatus = harmony_read(h, HARMONY_DSTATUS);
+        spin_unlock(&h->lock);
+
+        if (dstatus & HARMONY_DSTATUS_PN) {
+                if (h->psubs) {
+                        spin_lock(&h->lock);
+                        h->pbuf.buf += h->pbuf.count; /* PAGE_SIZE */
+                        h->pbuf.buf %= h->pbuf.size; /* MAX_BUFS*PAGE_SIZE */
+
+                        harmony_write(h, HARMONY_PNXTADD, 
+                                      h->pbuf.addr + h->pbuf.buf);
+                        h->stats.play_intr++;
+                        spin_unlock(&h->lock);
+                        snd_pcm_period_elapsed(h->psubs);
+                } else {
+                        spin_lock(&h->lock);
+                        harmony_write(h, HARMONY_PNXTADD, h->sdma.addr);
+                        h->stats.silence_intr++;
+                        spin_unlock(&h->lock);
+                }
+        }
+
+        if (dstatus & HARMONY_DSTATUS_RN) {
+                if (h->csubs) {
+                        spin_lock(&h->lock);
+                        h->cbuf.buf += h->cbuf.count;
+                        h->cbuf.buf %= h->cbuf.size;
+
+                        harmony_write(h, HARMONY_RNXTADD,
+                                      h->cbuf.addr + h->cbuf.buf);
+                        h->stats.rec_intr++;
+                        spin_unlock(&h->lock);
+                        snd_pcm_period_elapsed(h->csubs);
+                } else {
+                        spin_lock(&h->lock);
+                        harmony_write(h, HARMONY_RNXTADD, h->gdma.addr);
+                        h->stats.graveyard_intr++;
+                        spin_unlock(&h->lock);
+                }
+        }
+
+        spin_lock(&h->lock);
+        harmony_enable_interrupts(h);
+        spin_unlock(&h->lock);
+
+        return IRQ_HANDLED;
+}
+
+static unsigned int 
+snd_harmony_rate_bits(int rate)
+{
+        unsigned int i;
+        
+        for (i = 0; i < ARRAY_SIZE(snd_harmony_rates); i++)
+                if (snd_harmony_rates[i] == rate)
+                        return rate_bits[i];
+
+        return HARMONY_SR_44KHZ;
+}
+
+static snd_pcm_hardware_t snd_harmony_playback =
+{
+        .info = (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED | 
+                 SNDRV_PCM_INFO_JOINT_DUPLEX | SNDRV_PCM_INFO_MMAP_VALID |
+                 SNDRV_PCM_INFO_BLOCK_TRANSFER),
+        .formats = (SNDRV_PCM_FMTBIT_S16_BE | SNDRV_PCM_FMTBIT_MU_LAW |
+                    SNDRV_PCM_FMTBIT_A_LAW),
+        .rates = (SNDRV_PCM_RATE_5512 | SNDRV_PCM_RATE_8000_48000 |
+                  SNDRV_PCM_RATE_KNOT),
+        .rate_min = 5512,
+        .rate_max = 48000,
+        .channels_min = 1,
+        .channels_max = 2,
+        .buffer_bytes_max = MAX_BUF_SIZE,
+        .period_bytes_min = BUF_SIZE,
+        .period_bytes_max = BUF_SIZE,
+        .periods_min = 1,
+        .periods_max = MAX_BUFS,
+        .fifo_size = 0,
+};
+
+static snd_pcm_hardware_t snd_harmony_capture =
+{
+        .info = (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
+                 SNDRV_PCM_INFO_JOINT_DUPLEX | SNDRV_PCM_INFO_MMAP_VALID |
+                 SNDRV_PCM_INFO_BLOCK_TRANSFER),
+        .formats = (SNDRV_PCM_FMTBIT_S16_BE | SNDRV_PCM_FMTBIT_MU_LAW |
+                    SNDRV_PCM_FMTBIT_A_LAW),
+        .rates = (SNDRV_PCM_RATE_5512 | SNDRV_PCM_RATE_8000_48000 |
+                  SNDRV_PCM_RATE_KNOT),
+        .rate_min = 5512,
+        .rate_max = 48000,
+        .channels_min = 1,
+        .channels_max = 2,
+        .buffer_bytes_max = MAX_BUF_SIZE,
+        .period_bytes_min = BUF_SIZE,
+        .period_bytes_max = BUF_SIZE,
+        .periods_min = 1,
+        .periods_max = MAX_BUFS,
+        .fifo_size = 0,
+};
+
+static int
+snd_harmony_playback_trigger(snd_pcm_substream_t *ss, int cmd)
+{
+        harmony_t *h = snd_pcm_substream_chip(ss);
+        unsigned long flags;
+
+        if (h->st.capturing)
+                return -EBUSY;
+
+        spin_lock_irqsave(&h->lock, flags);
+        switch (cmd) {
+        case SNDRV_PCM_TRIGGER_START:
+                h->st.playing = 1;
+                harmony_write(h, HARMONY_PNXTADD, h->pbuf.addr);
+                harmony_write(h, HARMONY_RNXTADD, h->gdma.addr);
+                harmony_unmute(h);
+                harmony_enable_interrupts(h);
+                break;
+        case SNDRV_PCM_TRIGGER_STOP:
+                h->st.playing = 0;
+                harmony_mute(h);
+                harmony_disable_interrupts(h);
+                break;
+        case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+        case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+        case SNDRV_PCM_TRIGGER_SUSPEND:
+        default:
+                spin_unlock_irqrestore(&h->lock, flags);
+                snd_BUG();
+                return -EINVAL;
+        }
+        spin_unlock_irqrestore(&h->lock, flags);
+        
+        return 0;
+}
+
+static int
+snd_harmony_capture_trigger(snd_pcm_substream_t *ss, int cmd)
+{
+        harmony_t *h = snd_pcm_substream_chip(ss);
+        unsigned long flags;
+
+        if (h->st.playing)
+                return -EBUSY;
+
+        spin_lock_irqsave(&h->lock, flags);
+        switch (cmd) {
+        case SNDRV_PCM_TRIGGER_START:
+                h->st.capturing = 1;
+                harmony_write(h, HARMONY_PNXTADD, h->sdma.addr);
+                harmony_write(h, HARMONY_RNXTADD, h->cbuf.addr);
+                harmony_unmute(h);
+                harmony_enable_interrupts(h);
+                break;
+        case SNDRV_PCM_TRIGGER_STOP:
+                h->st.capturing = 0;
+                harmony_mute(h);
+                harmony_disable_interrupts(h);
+                break;
+        case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+        case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+        case SNDRV_PCM_TRIGGER_SUSPEND:
+        default:
+                spin_unlock_irqrestore(&h->lock, flags);
+                snd_BUG();
+                return -EINVAL;
+        }
+        spin_unlock_irqrestore(&h->lock, flags);
+                
+        return 0;
+}
+
+static int
+snd_harmony_set_data_format(harmony_t *h, int fmt, int force)
+{
+        int o = h->st.format;
+        int n;
+
+        switch(fmt) {
+        case SNDRV_PCM_FORMAT_S16_BE:
+                n = HARMONY_DF_16BIT_LINEAR;
+                break;
+        case SNDRV_PCM_FORMAT_A_LAW:
+                n = HARMONY_DF_8BIT_ALAW;
+                break;
+        case SNDRV_PCM_FORMAT_MU_LAW:
+                n = HARMONY_DF_8BIT_ULAW;
+                break;
+        default:
+                n = HARMONY_DF_16BIT_LINEAR;
+                break;
+        }
+
+        if (force || o != n) {
+                snd_pcm_format_set_silence(fmt, h->sdma.area, SILENCE_BUFSZ / 
+                                           (snd_pcm_format_physical_width(fmt)
+                                            / 8));
+        }
+
+        return n;
+}
+
+static int
+snd_harmony_playback_prepare(snd_pcm_substream_t *ss)
+{
+        harmony_t *h = snd_pcm_substream_chip(ss);
+        snd_pcm_runtime_t *rt = ss->runtime;
+        
+        if (h->st.capturing)
+                return -EBUSY;
+        
+        h->pbuf.size = snd_pcm_lib_buffer_bytes(ss);
+        h->pbuf.count = snd_pcm_lib_period_bytes(ss);
+        h->pbuf.buf = 0;
+        h->st.playing = 0;
+
+        h->st.rate = snd_harmony_rate_bits(rt->rate);
+        h->st.format = snd_harmony_set_data_format(h, rt->format, 0);
+        
+        if (rt->channels == 2)
+                h->st.stereo = HARMONY_SS_STEREO;
+        else
+                h->st.stereo = HARMONY_SS_MONO;
+
+        harmony_set_control(h);
+
+        h->pbuf.addr = rt->dma_addr;
+
+        return 0;
+}
+
+static int
+snd_harmony_capture_prepare(snd_pcm_substream_t *ss)
+{
+        harmony_t *h = snd_pcm_substream_chip(ss);
+        snd_pcm_runtime_t *rt = ss->runtime;
+
+        if (h->st.playing)
+                return -EBUSY;
+
+        h->cbuf.size = snd_pcm_lib_buffer_bytes(ss);
+        h->cbuf.count = snd_pcm_lib_period_bytes(ss);
+        h->cbuf.buf = 0;
+        h->st.capturing = 0;
+
+        h->st.rate = snd_harmony_rate_bits(rt->rate);
+        h->st.format = snd_harmony_set_data_format(h, rt->format, 0);
+
+        if (rt->channels == 2)
+                h->st.stereo = HARMONY_SS_STEREO;
+        else
+                h->st.stereo = HARMONY_SS_MONO;
+
+        harmony_set_control(h);
+
+        h->cbuf.addr = rt->dma_addr;
+
+        return 0;
+}
+
+static snd_pcm_uframes_t 
+snd_harmony_playback_pointer(snd_pcm_substream_t *ss)
+{
+        snd_pcm_runtime_t *rt = ss->runtime;
+        harmony_t *h = snd_pcm_substream_chip(ss);
+        unsigned long pcuradd;
+        unsigned long played;
+
+        if (!(h->st.playing) || (h->psubs == NULL)) 
+                return 0;
+
+        if ((h->pbuf.addr == 0) || (h->pbuf.size == 0))
+                return 0;
+        
+        pcuradd = harmony_read(h, HARMONY_PCURADD);
+        played = pcuradd - h->pbuf.addr;
+
+#ifdef HARMONY_DEBUG
+        printk(KERN_DEBUG PFX "playback_pointer is 0x%lx-0x%lx = %d bytes\n", 
+               pcuradd, h->pbuf.addr, played);  
+#endif
+
+        if (pcuradd > h->pbuf.addr + h->pbuf.size) {
+                return 0;
+        }
+
+        return bytes_to_frames(rt, played);
+}
+
+static snd_pcm_uframes_t
+snd_harmony_capture_pointer(snd_pcm_substream_t *ss)
+{
+        snd_pcm_runtime_t *rt = ss->runtime;
+        harmony_t *h = snd_pcm_substream_chip(ss);
+        unsigned long rcuradd;
+        unsigned long caught;
+
+        if (!(h->st.capturing) || (h->csubs == NULL))
+                return 0;
+
+        if ((h->cbuf.addr == 0) || (h->cbuf.size == 0))
+                return 0;
+
+        rcuradd = harmony_read(h, HARMONY_RCURADD);
+        caught = rcuradd - h->cbuf.addr;
+
+#ifdef HARMONY_DEBUG
+        printk(KERN_DEBUG PFX "capture_pointer is 0x%lx-0x%lx = %d bytes\n",
+               rcuradd, h->cbuf.addr, caught);
+#endif
+
+        if (rcuradd > h->cbuf.addr + h->cbuf.size) {
+                return 0;
+        }
+
+        return bytes_to_frames(rt, caught);
+}
+
+static int 
+snd_harmony_playback_open(snd_pcm_substream_t *ss)
+{
+        harmony_t *h = snd_pcm_substream_chip(ss);
+        snd_pcm_runtime_t *rt = ss->runtime;
+        int err;
+        
+        h->psubs = ss;
+        rt->hw = snd_harmony_playback;
+        snd_pcm_hw_constraint_list(rt, 0, SNDRV_PCM_HW_PARAM_RATE, 
+                                   &hw_constraint_rates);
+        
+        err = snd_pcm_hw_constraint_integer(rt, SNDRV_PCM_HW_PARAM_PERIODS);
+        if (err < 0)
+                return err;
+        
+        return 0;
+}
+
+static int
+snd_harmony_capture_open(snd_pcm_substream_t *ss)
+{
+        harmony_t *h = snd_pcm_substream_chip(ss);
+        snd_pcm_runtime_t *rt = ss->runtime;
+        int err;
+
+        h->csubs = ss;
+        rt->hw = snd_harmony_capture;
+        snd_pcm_hw_constraint_list(rt, 0, SNDRV_PCM_HW_PARAM_RATE,
+                                   &hw_constraint_rates);
+
+        err = snd_pcm_hw_constraint_integer(rt, SNDRV_PCM_HW_PARAM_PERIODS);
+        if (err < 0)
+                return err;
+
+        return 0;
+}
+
+static int 
+snd_harmony_playback_close(snd_pcm_substream_t *ss)
+{
+        harmony_t *h = snd_pcm_substream_chip(ss);
+        h->psubs = NULL;
+        return 0;
+}
+
+static int
+snd_harmony_capture_close(snd_pcm_substream_t *ss)
+{
+        harmony_t *h = snd_pcm_substream_chip(ss);
+        h->csubs = NULL;
+        return 0;
+}
+
+static int 
+snd_harmony_hw_params(snd_pcm_substream_t *ss,
+                      snd_pcm_hw_params_t *hw)
+{
+        int err;
+        harmony_t *h = snd_pcm_substream_chip(ss);
+        
+        err = snd_pcm_lib_malloc_pages(ss, params_buffer_bytes(hw));
+        if (err > 0 && h->dma.type == SNDRV_DMA_TYPE_CONTINUOUS)
+                ss->runtime->dma_addr = __pa(ss->runtime->dma_area);
+        
+        return err;
+}
+
+static int 
+snd_harmony_hw_free(snd_pcm_substream_t *ss) 
+{
+        return snd_pcm_lib_free_pages(ss);
+}
+
+static snd_pcm_ops_t snd_harmony_playback_ops = {
+        .open = snd_harmony_playback_open,
+        .close = snd_harmony_playback_close,
+        .ioctl = snd_pcm_lib_ioctl,
+        .hw_params = snd_harmony_hw_params,
+        .hw_free = snd_harmony_hw_free,
+        .prepare = snd_harmony_playback_prepare,
+        .trigger = snd_harmony_playback_trigger,
+        .pointer = snd_harmony_playback_pointer,
+};
+
+static snd_pcm_ops_t snd_harmony_capture_ops = {
+        .open = snd_harmony_capture_open,
+        .close = snd_harmony_capture_close,
+        .ioctl = snd_pcm_lib_ioctl,
+        .hw_params = snd_harmony_hw_params,
+        .hw_free = snd_harmony_hw_free,
+        .prepare = snd_harmony_capture_prepare,
+        .trigger = snd_harmony_capture_trigger,
+        .pointer = snd_harmony_capture_pointer,
+};
+
+static int 
+snd_harmony_pcm_init(harmony_t *h)
+{
+        snd_pcm_t *pcm;
+        int err;
+
+        harmony_disable_interrupts(h);
+        
+        err = snd_pcm_new(h->card, "harmony", 0, 1, 1, &pcm);
+        if (err < 0)
+                return err;
+        
+        snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, 
+                        &snd_harmony_playback_ops);
+        snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE,
+                        &snd_harmony_capture_ops);
+
+        pcm->private_data = h;
+        pcm->info_flags = 0;
+        strcpy(pcm->name, "harmony");
+        h->pcm = pcm;
+
+        h->psubs = NULL;
+        h->csubs = NULL;
+        
+        /* initialize graveyard buffer */
+        h->dma.type = SNDRV_DMA_TYPE_DEV;
+        h->dma.dev = &h->dev->dev;
+        err = snd_dma_alloc_pages(h->dma.type,
+                                  h->dma.dev,
+                                  BUF_SIZE*GRAVEYARD_BUFS,
+                                  &h->gdma);
+        if (err < 0) {
+                printk(KERN_ERR PFX "cannot allocate graveyard buffer!\n");
+                return err;
+        }
+        
+        /* initialize silence buffers */
+        err = snd_dma_alloc_pages(h->dma.type,
+                                  h->dma.dev,
+                                  BUF_SIZE*SILENCE_BUFS,
+                                  &h->sdma);
+        if (err < 0) {
+                printk(KERN_ERR PFX "cannot allocate silence buffer!\n");
+                return err;
+        }
+
+        /* pre-allocate space for DMA */
+        err = snd_pcm_lib_preallocate_pages_for_all(pcm, h->dma.type,
+                                                    h->dma.dev,
+                                                    MAX_BUF_SIZE, 
+                                                    MAX_BUF_SIZE);
+        if (err < 0) {
+                printk(KERN_ERR PFX "buffer allocation error: %d\n", err);
+                return err;
+        }
+
+        h->st.format = snd_harmony_set_data_format(h,
+                SNDRV_PCM_FORMAT_S16_BE, 1);
+
+        return 0;
+}
+
+static void 
+snd_harmony_set_new_gain(harmony_t *h)
+{
+        harmony_wait_for_control(h);
+        harmony_write(h, HARMONY_GAINCTL, h->st.gain);
+}
+
+static int 
+snd_harmony_mixercontrol_info(snd_kcontrol_t *kc, 
+                              snd_ctl_elem_info_t *uinfo)
+{
+        int mask = (kc->private_value >> 16) & 0xff;
+        int left_shift = (kc->private_value) & 0xff;
+        int right_shift = (kc->private_value >> 8) & 0xff;
+        
+        uinfo->type = mask == 1 ? SNDRV_CTL_ELEM_TYPE_BOOLEAN : 
+                       SNDRV_CTL_ELEM_TYPE_INTEGER;
+        uinfo->count = left_shift == right_shift ? 1 : 2;
+        uinfo->value.integer.min = 0;
+        uinfo->value.integer.max = mask;
+
+        return 0;
+}
+
+static int 
+snd_harmony_volume_get(snd_kcontrol_t *kc, 
+                       snd_ctl_elem_value_t *ucontrol)
+{
+        harmony_t *h = snd_kcontrol_chip(kc);
+        int shift_left = (kc->private_value) & 0xff;
+        int shift_right = (kc->private_value >> 8) & 0xff;
+        int mask = (kc->private_value >> 16) & 0xff;
+        int invert = (kc->private_value >> 24) & 0xff;
+        int left, right;
+        unsigned long flags;
+        
+        spin_lock_irqsave(&h->mixer_lock, flags);
+
+        left = (h->st.gain >> shift_left) & mask;
+        right = (h->st.gain >> shift_right) & mask;
+
+        if (invert) {
+                left = mask - left;
+                right = mask - right;
+        }
+        ucontrol->value.integer.value[0] = left;
+        ucontrol->value.integer.value[1] = right;
+
+        spin_unlock_irqrestore(&h->mixer_lock, flags);
+
+        return 0;
+}  
+
+static int 
+snd_harmony_volume_put(snd_kcontrol_t *kc, 
+                       snd_ctl_elem_value_t *ucontrol)
+{
+        harmony_t *h = snd_kcontrol_chip(kc);
+        int shift_left = (kc->private_value) & 0xff;
+        int shift_right = (kc->private_value >> 8) & 0xff;
+        int mask = (kc->private_value >> 16) & 0xff;
+        int invert = (kc->private_value >> 24) & 0xff;
+        int left, right;
+        int old_gain = h->st.gain;
+        unsigned long flags;
+        
+        left = ucontrol->value.integer.value[0] & mask;
+        right = ucontrol->value.integer.value[1] & mask;
+        if (invert) {
+                left = mask - left;
+                right = mask - right;
+        }
+        
+        spin_lock_irqsave(&h->mixer_lock, flags);
+
+        h->st.gain &= ~( (mask << shift_right) | (mask << shift_left) );
+        h->st.gain |=  ( (left << shift_left) | (right << shift_right) );
+        snd_harmony_set_new_gain(h);
+
+        spin_unlock_irqrestore(&h->mixer_lock, flags);
+        
+        return (old_gain - h->st.gain);
+}
+
+#define HARMONY_CONTROLS (sizeof(snd_harmony_controls)/ \
+                          sizeof(snd_kcontrol_new_t))
+
+#define HARMONY_VOLUME(xname, left_shift, right_shift, mask, invert) \
+{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname,                \
+  .info = snd_harmony_mixercontrol_info,                             \
+  .get = snd_harmony_volume_get, .put = snd_harmony_volume_put,      \
+  .private_value = ((left_shift) | ((right_shift) << 8) |            \
+                   ((mask) << 16) | ((invert) << 24)) }
+
+static snd_kcontrol_new_t snd_harmony_controls[] = {
+        HARMONY_VOLUME("Playback Volume", HARMONY_GAIN_LO_SHIFT, 
+                       HARMONY_GAIN_RO_SHIFT, HARMONY_GAIN_OUT, 1),
+        HARMONY_VOLUME("Capture Volume", HARMONY_GAIN_LI_SHIFT,
+                       HARMONY_GAIN_RI_SHIFT, HARMONY_GAIN_IN, 0),
+};
+
+static void __init 
+snd_harmony_mixer_reset(harmony_t *h)
+{
+        harmony_mute(h);
+        harmony_reset(h);
+        h->st.gain = HARMONY_GAIN_DEFAULT;
+        harmony_unmute(h);
+}
+
+static int __init 
+snd_harmony_mixer_init(harmony_t *h)
+{
+        snd_card_t *card = h->card;
+        int idx, err;
+
+        snd_assert(h != NULL, return -EINVAL);
+        strcpy(card->mixername, "Harmony Gain control interface");
+
+        for (idx = 0; idx < HARMONY_CONTROLS; idx++) {
+                err = snd_ctl_add(card, 
+                                  snd_ctl_new1(&snd_harmony_controls[idx], h));
+                if (err < 0)
+                        return err;
+        }
+        
+        snd_harmony_mixer_reset(h);
+
+        return 0;
+}
+
+static int
+snd_harmony_free(harmony_t *h)
+{
+        if (h->gdma.addr)
+                snd_dma_free_pages(&h->gdma);
+        if (h->sdma.addr)
+                snd_dma_free_pages(&h->sdma);
+
+        if (h->irq >= 0)
+                free_irq(h->irq, h);
+
+        if (h->iobase)
+                iounmap(h->iobase);
+
+        parisc_set_drvdata(h->dev, NULL);
+
+        kfree(h);
+        return 0;
+}
+
+static int
+snd_harmony_dev_free(snd_device_t *dev)
+{
+        harmony_t *h = dev->device_data;
+        return snd_harmony_free(h);
+}
+
+static int __devinit
+snd_harmony_create(snd_card_t *card, 
+                   struct parisc_device *padev, 
+                   harmony_t **rchip)
+{
+        int err;
+        harmony_t *h;
+        static snd_device_ops_t ops = {
+                .dev_free = snd_harmony_dev_free,
+        };
+
+        *rchip = NULL;
+
+        h = kmalloc(sizeof(*h), GFP_KERNEL);
+        if (h == NULL)
+                return -ENOMEM;
+
+        memset(&h->st, 0, sizeof(h->st));
+        memset(&h->stats, 0, sizeof(h->stats));
+        memset(&h->pbuf, 0, sizeof(h->pbuf));
+        memset(&h->cbuf, 0, sizeof(h->cbuf));
+
+        h->hpa = padev->hpa;
+        h->card = card;
+        h->dev = padev;
+        h->irq = padev->irq;
+        h->iobase = ioremap_nocache(padev->hpa, HARMONY_SIZE);
+        if (h->iobase == NULL) {
+                printk(KERN_ERR PFX "unable to remap hpa 0x%lx\n",
+                       padev->hpa);
+                err = -EBUSY;
+                goto free_and_ret;
+        }
+                
+        err = request_irq(h->irq, snd_harmony_interrupt, 0,
+                          "harmony", h);
+        if (err) {
+                printk(KERN_ERR PFX "could not obtain interrupt %d",
+                       h->irq);
+                goto free_and_ret;
+        }
+
+        spin_lock_init(&h->mixer_lock);
+        spin_lock_init(&h->lock);
+
+        if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL,
+                                  h, &ops)) < 0) {
+                goto free_and_ret;
+        }
+
+        *rchip = h;
+
+        return 0;
+
+free_and_ret:
+        snd_harmony_free(h);
+        return err;
+}
+
+static int __devinit
+snd_harmony_probe(struct parisc_device *padev)
+{
+        int err;
+        static int dev;
+        snd_card_t *card;
+        harmony_t *h;
+        static int index = SNDRV_DEFAULT_IDX1;
+        static char *id = SNDRV_DEFAULT_STR1;
+
+        h = parisc_get_drvdata(padev);
+        if (h != NULL) {
+                return -ENODEV;
+        }
+
+        card = snd_card_new(index, id, THIS_MODULE, 0);
+        if (card == NULL)
+                return -ENOMEM;
+
+        err = snd_harmony_create(card, padev, &h);
+        if (err < 0) {
+                goto free_and_ret;
+        }
+
+        err = snd_harmony_pcm_init(h);
+        if (err < 0) {
+                goto free_and_ret;
+        }
+
+        err = snd_harmony_mixer_init(h);
+        if (err < 0) {
+                goto free_and_ret;
+        }
+
+        strcpy(card->driver, "harmony");
+        strcpy(card->shortname, "Harmony");
+        sprintf(card->longname, "%s at 0x%lx, irq %i",
+                card->shortname, h->hpa, h->irq);
+
+        err = snd_card_register(card);
+        if (err < 0) {
+                goto free_and_ret;
+        }
+
+        dev++;
+        parisc_set_drvdata(padev, h);
+
+        return 0;
+
+free_and_ret:
+        snd_card_free(card);
+        return err;
+}
+
+static int __devexit
+snd_harmony_remove(struct parisc_device *padev)
+{
+        harmony_t *h = parisc_get_drvdata(padev);
+        snd_card_free(h->card);
+        return 0;
+}
+
+static struct parisc_driver snd_harmony_driver = {
+        .name = "harmony",
+        .id_table = snd_harmony_devtable,
+        .probe = snd_harmony_probe,
+        .remove = snd_harmony_remove,
+};
+
+static int __init 
+alsa_harmony_init(void)
+{
+        int err;
+
+        err = register_parisc_driver(&snd_harmony_driver);
+        if (err < 0) {
+                printk(KERN_ERR PFX "device not found\n");
+                return err;
+        }
+
+        return 0;
+}
+
+static void __exit
+alsa_harmony_fini(void)
+{
+        int err;
+
+        err = unregister_parisc_driver(&snd_harmony_driver);
+        if (err < 0) {
+                printk(KERN_ERR PFX "failed to unregister\n");
+        }
+        
+        return;
+}
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Kyle McMartin <kyle@parisc-linux.org>");
+MODULE_DESCRIPTION("Harmony sound driver");
+
+module_init(alsa_harmony_init);
+module_exit(alsa_harmony_fini);