Initial import

1 files changed, 1284 insertions, 0 deletions

diff --git a/drivers/media/pci/saa7134/saa7134-alsa.c b/drivers/media/pci/saa7134/saa7134-alsa.c
new file mode 100644
index 000000000..ac3cd74e8
--- /dev/null
+++ b/drivers/media/pci/saa7134/saa7134-alsa.c
@@ -0,0 +1,1284 @@
+/*
+ *   SAA713x ALSA support for V4L
+ *
+ *   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, version 2
+ *
+ *   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
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/time.h>
+#include <linux/wait.h>
+#include <linux/module.h>
+#include <sound/core.h>
+#include <sound/control.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/initval.h>
+#include <linux/interrupt.h>
+#include <linux/vmalloc.h>
+
+#include "saa7134.h"
+#include "saa7134-reg.h"
+
+static unsigned int debug;
+module_param(debug, int, 0644);
+MODULE_PARM_DESC(debug,"enable debug messages [alsa]");
+
+/*
+ * Configuration macros
+ */
+
+/* defaults */
+#define MIXER_ADDR_UNSELECTED	-1
+#define MIXER_ADDR_TVTUNER	0
+#define MIXER_ADDR_LINE1	1
+#define MIXER_ADDR_LINE2	2
+#define MIXER_ADDR_LAST		2
+
+
+static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;	/* Index 0-MAX */
+static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;	/* ID for this card */
+static int enable[SNDRV_CARDS] = {1, [1 ... (SNDRV_CARDS - 1)] = 1};
+
+module_param_array(index, int, NULL, 0444);
+module_param_array(enable, int, NULL, 0444);
+MODULE_PARM_DESC(index, "Index value for SAA7134 capture interface(s).");
+MODULE_PARM_DESC(enable, "Enable (or not) the SAA7134 capture interface(s).");
+
+#define dprintk(fmt, arg...)    if (debug) \
+	printk(KERN_DEBUG "%s/alsa: " fmt, dev->name , ##arg)
+
+
+
+/*
+ * Main chip structure
+ */
+
+typedef struct snd_card_saa7134 {
+	struct snd_card *card;
+	spinlock_t mixer_lock;
+	int mixer_volume[MIXER_ADDR_LAST+1][2];
+	int capture_source_addr;
+	int capture_source[2];
+	struct snd_kcontrol *capture_ctl[MIXER_ADDR_LAST+1];
+	struct pci_dev *pci;
+	struct saa7134_dev *dev;
+
+	unsigned long iobase;
+	s16 irq;
+	u16 mute_was_on;
+
+	spinlock_t lock;
+} snd_card_saa7134_t;
+
+
+/*
+ * PCM structure
+ */
+
+typedef struct snd_card_saa7134_pcm {
+	struct saa7134_dev *dev;
+
+	spinlock_t lock;
+
+	struct snd_pcm_substream *substream;
+} snd_card_saa7134_pcm_t;
+
+static struct snd_card *snd_saa7134_cards[SNDRV_CARDS];
+
+
+/*
+ * saa7134 DMA audio stop
+ *
+ *   Called when the capture device is released or the buffer overflows
+ *
+ *   - Copied verbatim from saa7134-oss's dsp_dma_stop.
+ *
+ */
+
+static void saa7134_dma_stop(struct saa7134_dev *dev)
+{
+	dev->dmasound.dma_blk     = -1;
+	dev->dmasound.dma_running = 0;
+	saa7134_set_dmabits(dev);
+}
+
+/*
+ * saa7134 DMA audio start
+ *
+ *   Called when preparing the capture device for use
+ *
+ *   - Copied verbatim from saa7134-oss's dsp_dma_start.
+ *
+ */
+
+static void saa7134_dma_start(struct saa7134_dev *dev)
+{
+	dev->dmasound.dma_blk     = 0;
+	dev->dmasound.dma_running = 1;
+	saa7134_set_dmabits(dev);
+}
+
+/*
+ * saa7134 audio DMA IRQ handler
+ *
+ *   Called whenever we get an SAA7134_IRQ_REPORT_DONE_RA3 interrupt
+ *   Handles shifting between the 2 buffers, manages the read counters,
+ *  and notifies ALSA when periods elapse
+ *
+ *   - Mostly copied from saa7134-oss's saa7134_irq_oss_done.
+ *
+ */
+
+static void saa7134_irq_alsa_done(struct saa7134_dev *dev,
+				  unsigned long status)
+{
+	int next_blk, reg = 0;
+
+	spin_lock(&dev->slock);
+	if (UNSET == dev->dmasound.dma_blk) {
+		dprintk("irq: recording stopped\n");
+		goto done;
+	}
+	if (0 != (status & 0x0f000000))
+		dprintk("irq: lost %ld\n", (status >> 24) & 0x0f);
+	if (0 == (status & 0x10000000)) {
+		/* odd */
+		if (0 == (dev->dmasound.dma_blk & 0x01))
+			reg = SAA7134_RS_BA1(6);
+	} else {
+		/* even */
+		if (1 == (dev->dmasound.dma_blk & 0x01))
+			reg = SAA7134_RS_BA2(6);
+	}
+	if (0 == reg) {
+		dprintk("irq: field oops [%s]\n",
+			(status & 0x10000000) ? "even" : "odd");
+		goto done;
+	}
+
+	if (dev->dmasound.read_count >= dev->dmasound.blksize * (dev->dmasound.blocks-2)) {
+		dprintk("irq: overrun [full=%d/%d] - Blocks in %d\n",dev->dmasound.read_count,
+			dev->dmasound.bufsize, dev->dmasound.blocks);
+		spin_unlock(&dev->slock);
+		snd_pcm_stop_xrun(dev->dmasound.substream);
+		return;
+	}
+
+	/* next block addr */
+	next_blk = (dev->dmasound.dma_blk + 2) % dev->dmasound.blocks;
+	saa_writel(reg,next_blk * dev->dmasound.blksize);
+	if (debug > 2)
+		dprintk("irq: ok, %s, next_blk=%d, addr=%x, blocks=%u, size=%u, read=%u\n",
+			(status & 0x10000000) ? "even" : "odd ", next_blk,
+			next_blk * dev->dmasound.blksize, dev->dmasound.blocks, dev->dmasound.blksize, dev->dmasound.read_count);
+
+	/* update status & wake waiting readers */
+	dev->dmasound.dma_blk = (dev->dmasound.dma_blk + 1) % dev->dmasound.blocks;
+	dev->dmasound.read_count += dev->dmasound.blksize;
+
+	dev->dmasound.recording_on = reg;
+
+	if (dev->dmasound.read_count >= snd_pcm_lib_period_bytes(dev->dmasound.substream)) {
+		spin_unlock(&dev->slock);
+		snd_pcm_period_elapsed(dev->dmasound.substream);
+		spin_lock(&dev->slock);
+	}
+
+ done:
+	spin_unlock(&dev->slock);
+
+}
+
+/*
+ * IRQ request handler
+ *
+ *   Runs along with saa7134's IRQ handler, discards anything that isn't
+ *   DMA sound
+ *
+ */
+
+static irqreturn_t saa7134_alsa_irq(int irq, void *dev_id)
+{
+	struct saa7134_dmasound *dmasound = dev_id;
+	struct saa7134_dev *dev = dmasound->priv_data;
+
+	unsigned long report, status;
+	int loop, handled = 0;
+
+	for (loop = 0; loop < 10; loop++) {
+		report = saa_readl(SAA7134_IRQ_REPORT);
+		status = saa_readl(SAA7134_IRQ_STATUS);
+
+		if (report & SAA7134_IRQ_REPORT_DONE_RA3) {
+			handled = 1;
+			saa_writel(SAA7134_IRQ_REPORT,
+				   SAA7134_IRQ_REPORT_DONE_RA3);
+			saa7134_irq_alsa_done(dev, status);
+		} else {
+			goto out;
+		}
+	}
+
+	if (loop == 10) {
+		dprintk("error! looping IRQ!");
+	}
+
+out:
+	return IRQ_RETVAL(handled);
+}
+
+/*
+ * ALSA capture trigger
+ *
+ *   - One of the ALSA capture callbacks.
+ *
+ *   Called whenever a capture is started or stopped. Must be defined,
+ *   but there's nothing we want to do here
+ *
+ */
+
+static int snd_card_saa7134_capture_trigger(struct snd_pcm_substream * substream,
+					  int cmd)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	snd_card_saa7134_pcm_t *pcm = runtime->private_data;
+	struct saa7134_dev *dev=pcm->dev;
+	int err = 0;
+
+	spin_lock(&dev->slock);
+	if (cmd == SNDRV_PCM_TRIGGER_START) {
+		/* start dma */
+		saa7134_dma_start(dev);
+	} else if (cmd == SNDRV_PCM_TRIGGER_STOP) {
+		/* stop dma */
+		saa7134_dma_stop(dev);
+	} else {
+		err = -EINVAL;
+	}
+	spin_unlock(&dev->slock);
+
+	return err;
+}
+
+static int saa7134_alsa_dma_init(struct saa7134_dev *dev, int nr_pages)
+{
+	struct saa7134_dmasound *dma = &dev->dmasound;
+	struct page *pg;
+	int i;
+
+	dma->vaddr = vmalloc_32(nr_pages << PAGE_SHIFT);
+	if (NULL == dma->vaddr) {
+		dprintk("vmalloc_32(%d pages) failed\n", nr_pages);
+		return -ENOMEM;
+	}
+
+	dprintk("vmalloc is at addr 0x%08lx, size=%d\n",
+				(unsigned long)dma->vaddr,
+				nr_pages << PAGE_SHIFT);
+
+	memset(dma->vaddr, 0, nr_pages << PAGE_SHIFT);
+	dma->nr_pages = nr_pages;
+
+	dma->sglist = vzalloc(dma->nr_pages * sizeof(*dma->sglist));
+	if (NULL == dma->sglist)
+		goto vzalloc_err;
+
+	sg_init_table(dma->sglist, dma->nr_pages);
+	for (i = 0; i < dma->nr_pages; i++) {
+		pg = vmalloc_to_page(dma->vaddr + i * PAGE_SIZE);
+		if (NULL == pg)
+			goto vmalloc_to_page_err;
+		sg_set_page(&dma->sglist[i], pg, PAGE_SIZE, 0);
+	}
+	return 0;
+
+vmalloc_to_page_err:
+	vfree(dma->sglist);
+	dma->sglist = NULL;
+vzalloc_err:
+	vfree(dma->vaddr);
+	dma->vaddr = NULL;
+	return -ENOMEM;
+}
+
+static int saa7134_alsa_dma_map(struct saa7134_dev *dev)
+{
+	struct saa7134_dmasound *dma = &dev->dmasound;
+
+	dma->sglen = dma_map_sg(&dev->pci->dev, dma->sglist,
+			dma->nr_pages, PCI_DMA_FROMDEVICE);
+
+	if (0 == dma->sglen) {
+		pr_warn("%s: saa7134_alsa_map_sg failed\n", __func__);
+		return -ENOMEM;
+	}
+	return 0;
+}
+
+static int saa7134_alsa_dma_unmap(struct saa7134_dev *dev)
+{
+	struct saa7134_dmasound *dma = &dev->dmasound;
+
+	if (!dma->sglen)
+		return 0;
+
+	dma_unmap_sg(&dev->pci->dev, dma->sglist, dma->sglen, PCI_DMA_FROMDEVICE);
+	dma->sglen = 0;
+	return 0;
+}
+
+static int saa7134_alsa_dma_free(struct saa7134_dmasound *dma)
+{
+	vfree(dma->sglist);
+	dma->sglist = NULL;
+	vfree(dma->vaddr);
+	dma->vaddr = NULL;
+	return 0;
+}
+
+/*
+ * DMA buffer initialization
+ *
+ *   Uses V4L functions to initialize the DMA. Shouldn't be necessary in
+ *  ALSA, but I was unable to use ALSA's own DMA, and had to force the
+ *  usage of V4L's
+ *
+ *   - Copied verbatim from saa7134-oss.
+ *
+ */
+
+static int dsp_buffer_init(struct saa7134_dev *dev)
+{
+	int err;
+
+	BUG_ON(!dev->dmasound.bufsize);
+
+	err = saa7134_alsa_dma_init(dev,
+			       (dev->dmasound.bufsize + PAGE_SIZE) >> PAGE_SHIFT);
+	if (0 != err)
+		return err;
+	return 0;
+}
+
+/*
+ * DMA buffer release
+ *
+ *   Called after closing the device, during snd_card_saa7134_capture_close
+ *
+ */
+
+static int dsp_buffer_free(struct saa7134_dev *dev)
+{
+	BUG_ON(!dev->dmasound.blksize);
+
+	saa7134_alsa_dma_free(&dev->dmasound);
+
+	dev->dmasound.blocks  = 0;
+	dev->dmasound.blksize = 0;
+	dev->dmasound.bufsize = 0;
+
+	return 0;
+}
+
+/*
+ * Setting the capture source and updating the ALSA controls
+ */
+static int snd_saa7134_capsrc_set(struct snd_kcontrol *kcontrol,
+				  int left, int right, bool force_notify)
+{
+	snd_card_saa7134_t *chip = snd_kcontrol_chip(kcontrol);
+	int change = 0, addr = kcontrol->private_value;
+	int active, old_addr;
+	u32 anabar, xbarin;
+	int analog_io, rate;
+	struct saa7134_dev *dev;
+
+	dev = chip->dev;
+
+	spin_lock_irq(&chip->mixer_lock);
+
+	active = left != 0 || right != 0;
+	old_addr = chip->capture_source_addr;
+
+	/* The active capture source cannot be deactivated */
+	if (active) {
+		change = old_addr != addr ||
+			 chip->capture_source[0] != left ||
+			 chip->capture_source[1] != right;
+
+		chip->capture_source[0] = left;
+		chip->capture_source[1] = right;
+		chip->capture_source_addr = addr;
+		dev->dmasound.input = addr;
+	}
+	spin_unlock_irq(&chip->mixer_lock);
+
+	if (change) {
+		switch (dev->pci->device) {
+
+		case PCI_DEVICE_ID_PHILIPS_SAA7134:
+			switch (addr) {
+			case MIXER_ADDR_TVTUNER:
+				saa_andorb(SAA7134_AUDIO_FORMAT_CTRL,
+					   0xc0, 0xc0);
+				saa_andorb(SAA7134_SIF_SAMPLE_FREQ,
+					   0x03, 0x00);
+				break;
+			case MIXER_ADDR_LINE1:
+			case MIXER_ADDR_LINE2:
+				analog_io = (MIXER_ADDR_LINE1 == addr) ?
+					     0x00 : 0x08;
+				rate = (32000 == dev->dmasound.rate) ?
+					0x01 : 0x03;
+				saa_andorb(SAA7134_ANALOG_IO_SELECT,
+					   0x08, analog_io);
+				saa_andorb(SAA7134_AUDIO_FORMAT_CTRL,
+					   0xc0, 0x80);
+				saa_andorb(SAA7134_SIF_SAMPLE_FREQ,
+					   0x03, rate);
+				break;
+			}
+
+			break;
+		case PCI_DEVICE_ID_PHILIPS_SAA7133:
+		case PCI_DEVICE_ID_PHILIPS_SAA7135:
+			xbarin = 0x03; /* adc */
+			anabar = 0;
+			switch (addr) {
+			case MIXER_ADDR_TVTUNER:
+				xbarin = 0; /* Demodulator */
+				anabar = 2; /* DACs */
+				break;
+			case MIXER_ADDR_LINE1:
+				anabar = 0;  /* aux1, aux1 */
+				break;
+			case MIXER_ADDR_LINE2:
+				anabar = 9;  /* aux2, aux2 */
+				break;
+			}
+
+			/* output xbar always main channel */
+			saa_dsp_writel(dev, SAA7133_DIGITAL_OUTPUT_SEL1,
+				       0xbbbb10);
+
+			if (left || right) {
+				/* We've got data, turn the input on */
+				saa_dsp_writel(dev, SAA7133_DIGITAL_INPUT_XBAR1,
+					       xbarin);
+				saa_writel(SAA7133_ANALOG_IO_SELECT, anabar);
+			} else {
+				saa_dsp_writel(dev, SAA7133_DIGITAL_INPUT_XBAR1,
+					       0);
+				saa_writel(SAA7133_ANALOG_IO_SELECT, 0);
+			}
+			break;
+		}
+	}
+
+	if (change) {
+		if (force_notify)
+			snd_ctl_notify(chip->card,
+				       SNDRV_CTL_EVENT_MASK_VALUE,
+				       &chip->capture_ctl[addr]->id);
+
+		if (old_addr != MIXER_ADDR_UNSELECTED && old_addr != addr)
+			snd_ctl_notify(chip->card,
+				       SNDRV_CTL_EVENT_MASK_VALUE,
+				       &chip->capture_ctl[old_addr]->id);
+	}
+
+	return change;
+}
+
+/*
+ * ALSA PCM preparation
+ *
+ *   - One of the ALSA capture callbacks.
+ *
+ *   Called right after the capture device is opened, this function configures
+ *  the buffer using the previously defined functions, allocates the memory,
+ *  sets up the hardware registers, and then starts the DMA. When this function
+ *  returns, the audio should be flowing.
+ *
+ */
+
+static int snd_card_saa7134_capture_prepare(struct snd_pcm_substream * substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	int bswap, sign;
+	u32 fmt, control;
+	snd_card_saa7134_t *saa7134 = snd_pcm_substream_chip(substream);
+	struct saa7134_dev *dev;
+	snd_card_saa7134_pcm_t *pcm = runtime->private_data;
+
+	pcm->dev->dmasound.substream = substream;
+
+	dev = saa7134->dev;
+
+	if (snd_pcm_format_width(runtime->format) == 8)
+		fmt = 0x00;
+	else
+		fmt = 0x01;
+
+	if (snd_pcm_format_signed(runtime->format))
+		sign = 1;
+	else
+		sign = 0;
+
+	if (snd_pcm_format_big_endian(runtime->format))
+		bswap = 1;
+	else
+		bswap = 0;
+
+	switch (dev->pci->device) {
+	  case PCI_DEVICE_ID_PHILIPS_SAA7134:
+		if (1 == runtime->channels)
+			fmt |= (1 << 3);
+		if (2 == runtime->channels)
+			fmt |= (3 << 3);
+		if (sign)
+			fmt |= 0x04;
+
+		fmt |= (MIXER_ADDR_TVTUNER == dev->dmasound.input) ? 0xc0 : 0x80;
+		saa_writeb(SAA7134_NUM_SAMPLES0, ((dev->dmasound.blksize - 1) & 0x0000ff));
+		saa_writeb(SAA7134_NUM_SAMPLES1, ((dev->dmasound.blksize - 1) & 0x00ff00) >>  8);
+		saa_writeb(SAA7134_NUM_SAMPLES2, ((dev->dmasound.blksize - 1) & 0xff0000) >> 16);
+		saa_writeb(SAA7134_AUDIO_FORMAT_CTRL, fmt);
+
+		break;
+	  case PCI_DEVICE_ID_PHILIPS_SAA7133:
+	  case PCI_DEVICE_ID_PHILIPS_SAA7135:
+		if (1 == runtime->channels)
+			fmt |= (1 << 4);
+		if (2 == runtime->channels)
+			fmt |= (2 << 4);
+		if (!sign)
+			fmt |= 0x04;
+		saa_writel(SAA7133_NUM_SAMPLES, dev->dmasound.blksize -1);
+		saa_writel(SAA7133_AUDIO_CHANNEL, 0x543210 | (fmt << 24));
+		break;
+	}
+
+	dprintk("rec_start: afmt=%d ch=%d  =>  fmt=0x%x swap=%c\n",
+		runtime->format, runtime->channels, fmt,
+		bswap ? 'b' : '-');
+	/* dma: setup channel 6 (= AUDIO) */
+	control = SAA7134_RS_CONTROL_BURST_16 |
+		SAA7134_RS_CONTROL_ME |
+		(dev->dmasound.pt.dma >> 12);
+	if (bswap)
+		control |= SAA7134_RS_CONTROL_BSWAP;
+
+	saa_writel(SAA7134_RS_BA1(6),0);
+	saa_writel(SAA7134_RS_BA2(6),dev->dmasound.blksize);
+	saa_writel(SAA7134_RS_PITCH(6),0);
+	saa_writel(SAA7134_RS_CONTROL(6),control);
+
+	dev->dmasound.rate = runtime->rate;
+
+	/* Setup and update the card/ALSA controls */
+	snd_saa7134_capsrc_set(saa7134->capture_ctl[dev->dmasound.input], 1, 1,
+			       true);
+
+	return 0;
+
+}
+
+/*
+ * ALSA pointer fetching
+ *
+ *   - One of the ALSA capture callbacks.
+ *
+ *   Called whenever a period elapses, it must return the current hardware
+ *  position of the buffer.
+ *   Also resets the read counter used to prevent overruns
+ *
+ */
+
+static snd_pcm_uframes_t
+snd_card_saa7134_capture_pointer(struct snd_pcm_substream * substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	snd_card_saa7134_pcm_t *pcm = runtime->private_data;
+	struct saa7134_dev *dev=pcm->dev;
+
+	if (dev->dmasound.read_count) {
+		dev->dmasound.read_count  -= snd_pcm_lib_period_bytes(substream);
+		dev->dmasound.read_offset += snd_pcm_lib_period_bytes(substream);
+		if (dev->dmasound.read_offset == dev->dmasound.bufsize)
+			dev->dmasound.read_offset = 0;
+	}
+
+	return bytes_to_frames(runtime, dev->dmasound.read_offset);
+}
+
+/*
+ * ALSA hardware capabilities definition
+ *
+ *  Report only 32kHz for ALSA:
+ *
+ *  - SAA7133/35 uses DDEP (DemDec Easy Programming mode), which works in 32kHz
+ *    only
+ *  - SAA7134 for TV mode uses DemDec mode (32kHz)
+ *  - Radio works in 32kHz only
+ *  - When recording 48kHz from Line1/Line2, switching of capture source to TV
+ *    means
+ *    switching to 32kHz without any frequency translation
+ */
+
+static struct snd_pcm_hardware snd_card_saa7134_capture =
+{
+	.info =                 (SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
+				 SNDRV_PCM_INFO_BLOCK_TRANSFER |
+				 SNDRV_PCM_INFO_MMAP_VALID),
+	.formats =		SNDRV_PCM_FMTBIT_S16_LE | \
+				SNDRV_PCM_FMTBIT_S16_BE | \
+				SNDRV_PCM_FMTBIT_S8 | \
+				SNDRV_PCM_FMTBIT_U8 | \
+				SNDRV_PCM_FMTBIT_U16_LE | \
+				SNDRV_PCM_FMTBIT_U16_BE,
+	.rates =		SNDRV_PCM_RATE_32000,
+	.rate_min =		32000,
+	.rate_max =		32000,
+	.channels_min =		1,
+	.channels_max =		2,
+	.buffer_bytes_max =	(256*1024),
+	.period_bytes_min =	64,
+	.period_bytes_max =	(256*1024),
+	.periods_min =		4,
+	.periods_max =		1024,
+};
+
+static void snd_card_saa7134_runtime_free(struct snd_pcm_runtime *runtime)
+{
+	snd_card_saa7134_pcm_t *pcm = runtime->private_data;
+
+	kfree(pcm);
+}
+
+
+/*
+ * ALSA hardware params
+ *
+ *   - One of the ALSA capture callbacks.
+ *
+ *   Called on initialization, right before the PCM preparation
+ *
+ */
+
+static int snd_card_saa7134_hw_params(struct snd_pcm_substream * substream,
+				      struct snd_pcm_hw_params * hw_params)
+{
+	snd_card_saa7134_t *saa7134 = snd_pcm_substream_chip(substream);
+	struct saa7134_dev *dev;
+	unsigned int period_size, periods;
+	int err;
+
+	period_size = params_period_bytes(hw_params);
+	periods = params_periods(hw_params);
+
+	if (period_size < 0x100 || period_size > 0x10000)
+		return -EINVAL;
+	if (periods < 4)
+		return -EINVAL;
+	if (period_size * periods > 1024 * 1024)
+		return -EINVAL;
+
+	dev = saa7134->dev;
+
+	if (dev->dmasound.blocks == periods &&
+	    dev->dmasound.blksize == period_size)
+		return 0;
+
+	/* release the old buffer */
+	if (substream->runtime->dma_area) {
+		saa7134_pgtable_free(dev->pci, &dev->dmasound.pt);
+		saa7134_alsa_dma_unmap(dev);
+		dsp_buffer_free(dev);
+		substream->runtime->dma_area = NULL;
+	}
+	dev->dmasound.blocks  = periods;
+	dev->dmasound.blksize = period_size;
+	dev->dmasound.bufsize = period_size * periods;
+
+	err = dsp_buffer_init(dev);
+	if (0 != err) {
+		dev->dmasound.blocks  = 0;
+		dev->dmasound.blksize = 0;
+		dev->dmasound.bufsize = 0;
+		return err;
+	}
+
+	err = saa7134_alsa_dma_map(dev);
+	if (err) {
+		dsp_buffer_free(dev);
+		return err;
+	}
+	err = saa7134_pgtable_alloc(dev->pci, &dev->dmasound.pt);
+	if (err) {
+		saa7134_alsa_dma_unmap(dev);
+		dsp_buffer_free(dev);
+		return err;
+	}
+	err = saa7134_pgtable_build(dev->pci, &dev->dmasound.pt,
+				dev->dmasound.sglist, dev->dmasound.sglen, 0);
+	if (err) {
+		saa7134_pgtable_free(dev->pci, &dev->dmasound.pt);
+		saa7134_alsa_dma_unmap(dev);
+		dsp_buffer_free(dev);
+		return err;
+	}
+
+	/* I should be able to use runtime->dma_addr in the control
+	   byte, but it doesn't work. So I allocate the DMA using the
+	   V4L functions, and force ALSA to use that as the DMA area */
+
+	substream->runtime->dma_area = dev->dmasound.vaddr;
+	substream->runtime->dma_bytes = dev->dmasound.bufsize;
+	substream->runtime->dma_addr = 0;
+
+	return 0;
+
+}
+
+/*
+ * ALSA hardware release
+ *
+ *   - One of the ALSA capture callbacks.
+ *
+ *   Called after closing the device, but before snd_card_saa7134_capture_close
+ *   It stops the DMA audio and releases the buffers.
+ *
+ */
+
+static int snd_card_saa7134_hw_free(struct snd_pcm_substream * substream)
+{
+	snd_card_saa7134_t *saa7134 = snd_pcm_substream_chip(substream);
+	struct saa7134_dev *dev;
+
+	dev = saa7134->dev;
+
+	if (substream->runtime->dma_area) {
+		saa7134_pgtable_free(dev->pci, &dev->dmasound.pt);
+		saa7134_alsa_dma_unmap(dev);
+		dsp_buffer_free(dev);
+		substream->runtime->dma_area = NULL;
+	}
+
+	return 0;
+}
+
+/*
+ * ALSA capture finish
+ *
+ *   - One of the ALSA capture callbacks.
+ *
+ *   Called after closing the device.
+ *
+ */
+
+static int snd_card_saa7134_capture_close(struct snd_pcm_substream * substream)
+{
+	snd_card_saa7134_t *saa7134 = snd_pcm_substream_chip(substream);
+	struct saa7134_dev *dev = saa7134->dev;
+
+	if (saa7134->mute_was_on) {
+		dev->ctl_mute = 1;
+		saa7134_tvaudio_setmute(dev);
+	}
+	return 0;
+}
+
+/*
+ * ALSA capture start
+ *
+ *   - One of the ALSA capture callbacks.
+ *
+ *   Called when opening the device. It creates and populates the PCM
+ *  structure
+ *
+ */
+
+static int snd_card_saa7134_capture_open(struct snd_pcm_substream * substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	snd_card_saa7134_pcm_t *pcm;
+	snd_card_saa7134_t *saa7134 = snd_pcm_substream_chip(substream);
+	struct saa7134_dev *dev;
+	int amux, err;
+
+	if (!saa7134) {
+		printk(KERN_ERR "BUG: saa7134 can't find device struct."
+				" Can't proceed with open\n");
+		return -ENODEV;
+	}
+	dev = saa7134->dev;
+	mutex_lock(&dev->dmasound.lock);
+
+	dev->dmasound.read_count  = 0;
+	dev->dmasound.read_offset = 0;
+
+	amux = dev->input->amux;
+	if ((amux < 1) || (amux > 3))
+		amux = 1;
+	dev->dmasound.input  =  amux - 1;
+
+	mutex_unlock(&dev->dmasound.lock);
+
+	pcm = kzalloc(sizeof(*pcm), GFP_KERNEL);
+	if (pcm == NULL)
+		return -ENOMEM;
+
+	pcm->dev=saa7134->dev;
+
+	spin_lock_init(&pcm->lock);
+
+	pcm->substream = substream;
+	runtime->private_data = pcm;
+	runtime->private_free = snd_card_saa7134_runtime_free;
+	runtime->hw = snd_card_saa7134_capture;
+
+	if (dev->ctl_mute != 0) {
+		saa7134->mute_was_on = 1;
+		dev->ctl_mute = 0;
+		saa7134_tvaudio_setmute(dev);
+	}
+
+	err = snd_pcm_hw_constraint_integer(runtime,
+						SNDRV_PCM_HW_PARAM_PERIODS);
+	if (err < 0)
+		return err;
+
+	err = snd_pcm_hw_constraint_step(runtime, 0,
+						SNDRV_PCM_HW_PARAM_PERIODS, 2);
+	if (err < 0)
+		return err;
+
+	return 0;
+}
+
+/*
+ * page callback (needed for mmap)
+ */
+
+static struct page *snd_card_saa7134_page(struct snd_pcm_substream *substream,
+					unsigned long offset)
+{
+	void *pageptr = substream->runtime->dma_area + offset;
+	return vmalloc_to_page(pageptr);
+}
+
+/*
+ * ALSA capture callbacks definition
+ */
+
+static struct snd_pcm_ops snd_card_saa7134_capture_ops = {
+	.open =			snd_card_saa7134_capture_open,
+	.close =		snd_card_saa7134_capture_close,
+	.ioctl =		snd_pcm_lib_ioctl,
+	.hw_params =		snd_card_saa7134_hw_params,
+	.hw_free =		snd_card_saa7134_hw_free,
+	.prepare =		snd_card_saa7134_capture_prepare,
+	.trigger =		snd_card_saa7134_capture_trigger,
+	.pointer =		snd_card_saa7134_capture_pointer,
+	.page =			snd_card_saa7134_page,
+};
+
+/*
+ * ALSA PCM setup
+ *
+ *   Called when initializing the board. Sets up the name and hooks up
+ *  the callbacks
+ *
+ */
+
+static int snd_card_saa7134_pcm(snd_card_saa7134_t *saa7134, int device)
+{
+	struct snd_pcm *pcm;
+	int err;
+
+	if ((err = snd_pcm_new(saa7134->card, "SAA7134 PCM", device, 0, 1, &pcm)) < 0)
+		return err;
+	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_card_saa7134_capture_ops);
+	pcm->private_data = saa7134;
+	pcm->info_flags = 0;
+	strcpy(pcm->name, "SAA7134 PCM");
+	return 0;
+}
+
+#define SAA713x_VOLUME(xname, xindex, addr) \
+{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
+  .info = snd_saa7134_volume_info, \
+  .get = snd_saa7134_volume_get, .put = snd_saa7134_volume_put, \
+  .private_value = addr }
+
+static int snd_saa7134_volume_info(struct snd_kcontrol * kcontrol,
+				   struct snd_ctl_elem_info * uinfo)
+{
+	uinfo->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
+	uinfo->count = 2;
+	uinfo->value.integer.min = 0;
+	uinfo->value.integer.max = 20;
+	return 0;
+}
+
+static int snd_saa7134_volume_get(struct snd_kcontrol * kcontrol,
+				  struct snd_ctl_elem_value * ucontrol)
+{
+	snd_card_saa7134_t *chip = snd_kcontrol_chip(kcontrol);
+	int addr = kcontrol->private_value;
+
+	ucontrol->value.integer.value[0] = chip->mixer_volume[addr][0];
+	ucontrol->value.integer.value[1] = chip->mixer_volume[addr][1];
+	return 0;
+}
+
+static int snd_saa7134_volume_put(struct snd_kcontrol * kcontrol,
+				  struct snd_ctl_elem_value * ucontrol)
+{
+	snd_card_saa7134_t *chip = snd_kcontrol_chip(kcontrol);
+	struct saa7134_dev *dev = chip->dev;
+
+	int change, addr = kcontrol->private_value;
+	int left, right;
+
+	left = ucontrol->value.integer.value[0];
+	if (left < 0)
+		left = 0;
+	if (left > 20)
+		left = 20;
+	right = ucontrol->value.integer.value[1];
+	if (right < 0)
+		right = 0;
+	if (right > 20)
+		right = 20;
+	spin_lock_irq(&chip->mixer_lock);
+	change = 0;
+	if (chip->mixer_volume[addr][0] != left) {
+		change = 1;
+		right = left;
+	}
+	if (chip->mixer_volume[addr][1] != right) {
+		change = 1;
+		left = right;
+	}
+	if (change) {
+		switch (dev->pci->device) {
+			case PCI_DEVICE_ID_PHILIPS_SAA7134:
+				switch (addr) {
+					case MIXER_ADDR_TVTUNER:
+						left = 20;
+						break;
+					case MIXER_ADDR_LINE1:
+						saa_andorb(SAA7134_ANALOG_IO_SELECT,  0x10,
+							   (left > 10) ? 0x00 : 0x10);
+						break;
+					case MIXER_ADDR_LINE2:
+						saa_andorb(SAA7134_ANALOG_IO_SELECT,  0x20,
+							   (left > 10) ? 0x00 : 0x20);
+						break;
+				}
+				break;
+			case PCI_DEVICE_ID_PHILIPS_SAA7133:
+			case PCI_DEVICE_ID_PHILIPS_SAA7135:
+				switch (addr) {
+					case MIXER_ADDR_TVTUNER:
+						left = 20;
+						break;
+					case MIXER_ADDR_LINE1:
+						saa_andorb(0x0594,  0x10,
+							   (left > 10) ? 0x00 : 0x10);
+						break;
+					case MIXER_ADDR_LINE2:
+						saa_andorb(0x0594,  0x20,
+							   (left > 10) ? 0x00 : 0x20);
+						break;
+				}
+				break;
+		}
+		chip->mixer_volume[addr][0] = left;
+		chip->mixer_volume[addr][1] = right;
+	}
+	spin_unlock_irq(&chip->mixer_lock);
+	return change;
+}
+
+#define SAA713x_CAPSRC(xname, xindex, addr) \
+{ .iface = SNDRV_CTL_ELEM_IFACE_MIXER, .name = xname, .index = xindex, \
+  .info = snd_saa7134_capsrc_info, \
+  .get = snd_saa7134_capsrc_get, .put = snd_saa7134_capsrc_put, \
+  .private_value = addr }
+
+static int snd_saa7134_capsrc_info(struct snd_kcontrol * kcontrol,
+				   struct snd_ctl_elem_info * uinfo)
+{
+	uinfo->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
+	uinfo->count = 2;
+	uinfo->value.integer.min = 0;
+	uinfo->value.integer.max = 1;
+	return 0;
+}
+
+static int snd_saa7134_capsrc_get(struct snd_kcontrol * kcontrol,
+				  struct snd_ctl_elem_value * ucontrol)
+{
+	snd_card_saa7134_t *chip = snd_kcontrol_chip(kcontrol);
+	int addr = kcontrol->private_value;
+
+	spin_lock_irq(&chip->mixer_lock);
+	if (chip->capture_source_addr == addr) {
+		ucontrol->value.integer.value[0] = chip->capture_source[0];
+		ucontrol->value.integer.value[1] = chip->capture_source[1];
+	} else {
+		ucontrol->value.integer.value[0] = 0;
+		ucontrol->value.integer.value[1] = 0;
+	}
+	spin_unlock_irq(&chip->mixer_lock);
+
+	return 0;
+}
+
+static int snd_saa7134_capsrc_put(struct snd_kcontrol * kcontrol,
+				  struct snd_ctl_elem_value * ucontrol)
+{
+	int left, right;
+	left = ucontrol->value.integer.value[0] & 1;
+	right = ucontrol->value.integer.value[1] & 1;
+
+	return snd_saa7134_capsrc_set(kcontrol, left, right, false);
+}
+
+static struct snd_kcontrol_new snd_saa7134_volume_controls[] = {
+SAA713x_VOLUME("Video Volume", 0, MIXER_ADDR_TVTUNER),
+SAA713x_VOLUME("Line Volume", 1, MIXER_ADDR_LINE1),
+SAA713x_VOLUME("Line Volume", 2, MIXER_ADDR_LINE2),
+};
+
+static struct snd_kcontrol_new snd_saa7134_capture_controls[] = {
+SAA713x_CAPSRC("Video Capture Switch", 0, MIXER_ADDR_TVTUNER),
+SAA713x_CAPSRC("Line Capture Switch", 1, MIXER_ADDR_LINE1),
+SAA713x_CAPSRC("Line Capture Switch", 2, MIXER_ADDR_LINE2),
+};
+
+/*
+ * ALSA mixer setup
+ *
+ *   Called when initializing the board. Sets up the name and hooks up
+ *  the callbacks
+ *
+ */
+
+static int snd_card_saa7134_new_mixer(snd_card_saa7134_t * chip)
+{
+	struct snd_card *card = chip->card;
+	struct snd_kcontrol *kcontrol;
+	unsigned int idx;
+	int err, addr;
+
+	strcpy(card->mixername, "SAA7134 Mixer");
+
+	for (idx = 0; idx < ARRAY_SIZE(snd_saa7134_volume_controls); idx++) {
+		kcontrol = snd_ctl_new1(&snd_saa7134_volume_controls[idx],
+					chip);
+		err = snd_ctl_add(card, kcontrol);
+		if (err < 0)
+			return err;
+	}
+
+	for (idx = 0; idx < ARRAY_SIZE(snd_saa7134_capture_controls); idx++) {
+		kcontrol = snd_ctl_new1(&snd_saa7134_capture_controls[idx],
+					chip);
+		addr = snd_saa7134_capture_controls[idx].private_value;
+		chip->capture_ctl[addr] = kcontrol;
+		err = snd_ctl_add(card, kcontrol);
+		if (err < 0)
+			return err;
+	}
+
+	chip->capture_source_addr = MIXER_ADDR_UNSELECTED;
+	return 0;
+}
+
+static void snd_saa7134_free(struct snd_card * card)
+{
+	snd_card_saa7134_t *chip = card->private_data;
+
+	if (chip->dev->dmasound.priv_data == NULL)
+		return;
+
+	if (chip->irq >= 0)
+		free_irq(chip->irq, &chip->dev->dmasound);
+
+	chip->dev->dmasound.priv_data = NULL;
+
+}
+
+/*
+ * ALSA initialization
+ *
+ *   Called by the init routine, once for each saa7134 device present,
+ *  it creates the basic structures and registers the ALSA devices
+ *
+ */
+
+static int alsa_card_saa7134_create(struct saa7134_dev *dev, int devnum)
+{
+
+	struct snd_card *card;
+	snd_card_saa7134_t *chip;
+	int err;
+
+
+	if (devnum >= SNDRV_CARDS)
+		return -ENODEV;
+	if (!enable[devnum])
+		return -ENODEV;
+
+	err = snd_card_new(&dev->pci->dev, index[devnum], id[devnum],
+			   THIS_MODULE, sizeof(snd_card_saa7134_t), &card);
+	if (err < 0)
+		return err;
+
+	strcpy(card->driver, "SAA7134");
+
+	/* Card "creation" */
+
+	card->private_free = snd_saa7134_free;
+	chip = card->private_data;
+
+	spin_lock_init(&chip->lock);
+	spin_lock_init(&chip->mixer_lock);
+
+	chip->dev = dev;
+
+	chip->card = card;
+
+	chip->pci = dev->pci;
+	chip->iobase = pci_resource_start(dev->pci, 0);
+
+
+	err = request_irq(dev->pci->irq, saa7134_alsa_irq,
+				IRQF_SHARED, dev->name,
+				(void*) &dev->dmasound);
+
+	if (err < 0) {
+		printk(KERN_ERR "%s: can't get IRQ %d for ALSA\n",
+			dev->name, dev->pci->irq);
+		goto __nodev;
+	}
+
+	chip->irq = dev->pci->irq;
+
+	mutex_init(&dev->dmasound.lock);
+
+	if ((err = snd_card_saa7134_new_mixer(chip)) < 0)
+		goto __nodev;
+
+	if ((err = snd_card_saa7134_pcm(chip, 0)) < 0)
+		goto __nodev;
+
+	/* End of "creation" */
+
+	strcpy(card->shortname, "SAA7134");
+	sprintf(card->longname, "%s at 0x%lx irq %d",
+		chip->dev->name, chip->iobase, chip->irq);
+
+	printk(KERN_INFO "%s/alsa: %s registered as card %d\n",dev->name,card->longname,index[devnum]);
+
+	if ((err = snd_card_register(card)) == 0) {
+		snd_saa7134_cards[devnum] = card;
+		return 0;
+	}
+
+__nodev:
+	snd_card_free(card);
+	return err;
+}
+
+
+static int alsa_device_init(struct saa7134_dev *dev)
+{
+	dev->dmasound.priv_data = dev;
+	alsa_card_saa7134_create(dev,dev->nr);
+	return 1;
+}
+
+static int alsa_device_exit(struct saa7134_dev *dev)
+{
+
+	snd_card_free(snd_saa7134_cards[dev->nr]);
+	snd_saa7134_cards[dev->nr] = NULL;
+	return 1;
+}
+
+/*
+ * Module initializer
+ *
+ * Loops through present saa7134 cards, and assigns an ALSA device
+ * to each one
+ *
+ */
+
+static int saa7134_alsa_init(void)
+{
+	struct saa7134_dev *dev = NULL;
+	struct list_head *list;
+
+	saa7134_dmasound_init = alsa_device_init;
+	saa7134_dmasound_exit = alsa_device_exit;
+
+	printk(KERN_INFO "saa7134 ALSA driver for DMA sound loaded\n");
+
+	list_for_each(list,&saa7134_devlist) {
+		dev = list_entry(list, struct saa7134_dev, devlist);
+		if (dev->pci->device == PCI_DEVICE_ID_PHILIPS_SAA7130)
+			printk(KERN_INFO "%s/alsa: %s doesn't support digital audio\n",
+				dev->name, saa7134_boards[dev->board].name);
+		else
+			alsa_device_init(dev);
+	}
+
+	if (dev == NULL)
+		printk(KERN_INFO "saa7134 ALSA: no saa7134 cards found\n");
+
+	return 0;
+
+}
+
+/*
+ * Module destructor
+ */
+
+static void saa7134_alsa_exit(void)
+{
+	int idx;
+
+	for (idx = 0; idx < SNDRV_CARDS; idx++) {
+		snd_card_free(snd_saa7134_cards[idx]);
+	}
+
+	saa7134_dmasound_init = NULL;
+	saa7134_dmasound_exit = NULL;
+	printk(KERN_INFO "saa7134 ALSA driver for DMA sound unloaded\n");
+
+	return;
+}
+
+/* We initialize this late, to make sure the sound system is up and running */
+late_initcall(saa7134_alsa_init);
+module_exit(saa7134_alsa_exit);
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Ricardo Cerqueira");