Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1175 insertions, 0 deletions

diff --git a/sound/pci/via82xx_modem.c b/sound/pci/via82xx_modem.c
new file mode 100644
index 0000000000..ca7f024bf8
--- /dev/null
+++ b/sound/pci/via82xx_modem.c
@@ -0,0 +1,1175 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *   ALSA modem driver for VIA VT82xx (South Bridge)
+ *
+ *   VT82C686A/B/C, VT8233A/C, VT8235
+ *
+ *	Copyright (c) 2000 Jaroslav Kysela <perex@perex.cz>
+ *	                   Tjeerd.Mulder <Tjeerd.Mulder@fujitsu-siemens.com>
+ *                    2002 Takashi Iwai <tiwai@suse.de>
+ */
+
+/*
+ * Changes:
+ *
+ * Sep. 2,  2004  Sasha Khapyorsky <sashak@alsa-project.org>
+ *      Modified from original audio driver 'via82xx.c' to support AC97
+ *      modems.
+ */
+
+#include <linux/io.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/init.h>
+#include <linux/pci.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/info.h>
+#include <sound/ac97_codec.h>
+#include <sound/initval.h>
+
+#if 0
+#define POINTER_DEBUG
+#endif
+
+MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
+MODULE_DESCRIPTION("VIA VT82xx modem");
+MODULE_LICENSE("GPL");
+
+static int index = -2; /* Exclude the first card */
+static char *id = SNDRV_DEFAULT_STR1;	/* ID for this card */
+static int ac97_clock = 48000;
+
+module_param(index, int, 0444);
+MODULE_PARM_DESC(index, "Index value for VIA 82xx bridge.");
+module_param(id, charp, 0444);
+MODULE_PARM_DESC(id, "ID string for VIA 82xx bridge.");
+module_param(ac97_clock, int, 0444);
+MODULE_PARM_DESC(ac97_clock, "AC'97 codec clock (default 48000Hz).");
+
+/* just for backward compatibility */
+static bool enable;
+module_param(enable, bool, 0444);
+
+
+/*
+ *  Direct registers
+ */
+
+#define VIAREG(via, x) ((via)->port + VIA_REG_##x)
+#define VIADEV_REG(viadev, x) ((viadev)->port + VIA_REG_##x)
+
+/* common offsets */
+#define VIA_REG_OFFSET_STATUS		0x00	/* byte - channel status */
+#define   VIA_REG_STAT_ACTIVE		0x80	/* RO */
+#define   VIA_REG_STAT_PAUSED		0x40	/* RO */
+#define   VIA_REG_STAT_TRIGGER_QUEUED	0x08	/* RO */
+#define   VIA_REG_STAT_STOPPED		0x04	/* RWC */
+#define   VIA_REG_STAT_EOL		0x02	/* RWC */
+#define   VIA_REG_STAT_FLAG		0x01	/* RWC */
+#define VIA_REG_OFFSET_CONTROL		0x01	/* byte - channel control */
+#define   VIA_REG_CTRL_START		0x80	/* WO */
+#define   VIA_REG_CTRL_TERMINATE	0x40	/* WO */
+#define   VIA_REG_CTRL_AUTOSTART	0x20
+#define   VIA_REG_CTRL_PAUSE		0x08	/* RW */
+#define   VIA_REG_CTRL_INT_STOP		0x04		
+#define   VIA_REG_CTRL_INT_EOL		0x02
+#define   VIA_REG_CTRL_INT_FLAG		0x01
+#define   VIA_REG_CTRL_RESET		0x01	/* RW - probably reset? undocumented */
+#define   VIA_REG_CTRL_INT (VIA_REG_CTRL_INT_FLAG | VIA_REG_CTRL_INT_EOL | VIA_REG_CTRL_AUTOSTART)
+#define VIA_REG_OFFSET_TYPE		0x02	/* byte - channel type (686 only) */
+#define   VIA_REG_TYPE_AUTOSTART	0x80	/* RW - autostart at EOL */
+#define   VIA_REG_TYPE_16BIT		0x20	/* RW */
+#define   VIA_REG_TYPE_STEREO		0x10	/* RW */
+#define   VIA_REG_TYPE_INT_LLINE	0x00
+#define   VIA_REG_TYPE_INT_LSAMPLE	0x04
+#define   VIA_REG_TYPE_INT_LESSONE	0x08
+#define   VIA_REG_TYPE_INT_MASK		0x0c
+#define   VIA_REG_TYPE_INT_EOL		0x02
+#define   VIA_REG_TYPE_INT_FLAG		0x01
+#define VIA_REG_OFFSET_TABLE_PTR	0x04	/* dword - channel table pointer */
+#define VIA_REG_OFFSET_CURR_PTR		0x04	/* dword - channel current pointer */
+#define VIA_REG_OFFSET_STOP_IDX		0x08	/* dword - stop index, channel type, sample rate */
+#define VIA_REG_OFFSET_CURR_COUNT	0x0c	/* dword - channel current count (24 bit) */
+#define VIA_REG_OFFSET_CURR_INDEX	0x0f	/* byte - channel current index (for via8233 only) */
+
+#define DEFINE_VIA_REGSET(name,val) \
+enum {\
+	VIA_REG_##name##_STATUS		= (val),\
+	VIA_REG_##name##_CONTROL	= (val) + 0x01,\
+	VIA_REG_##name##_TYPE		= (val) + 0x02,\
+	VIA_REG_##name##_TABLE_PTR	= (val) + 0x04,\
+	VIA_REG_##name##_CURR_PTR	= (val) + 0x04,\
+	VIA_REG_##name##_STOP_IDX	= (val) + 0x08,\
+	VIA_REG_##name##_CURR_COUNT	= (val) + 0x0c,\
+}
+
+/* modem block */
+DEFINE_VIA_REGSET(MO, 0x40);
+DEFINE_VIA_REGSET(MI, 0x50);
+
+/* AC'97 */
+#define VIA_REG_AC97			0x80	/* dword */
+#define   VIA_REG_AC97_CODEC_ID_MASK	(3<<30)
+#define   VIA_REG_AC97_CODEC_ID_SHIFT	30
+#define   VIA_REG_AC97_CODEC_ID_PRIMARY	0x00
+#define   VIA_REG_AC97_CODEC_ID_SECONDARY 0x01
+#define   VIA_REG_AC97_SECONDARY_VALID	(1<<27)
+#define   VIA_REG_AC97_PRIMARY_VALID	(1<<25)
+#define   VIA_REG_AC97_BUSY		(1<<24)
+#define   VIA_REG_AC97_READ		(1<<23)
+#define   VIA_REG_AC97_CMD_SHIFT	16
+#define   VIA_REG_AC97_CMD_MASK		0x7e
+#define   VIA_REG_AC97_DATA_SHIFT	0
+#define   VIA_REG_AC97_DATA_MASK	0xffff
+
+#define VIA_REG_SGD_SHADOW		0x84	/* dword */
+#define   VIA_REG_SGD_STAT_PB_FLAG	(1<<0)
+#define   VIA_REG_SGD_STAT_CP_FLAG	(1<<1)
+#define   VIA_REG_SGD_STAT_FM_FLAG	(1<<2)
+#define   VIA_REG_SGD_STAT_PB_EOL	(1<<4)
+#define   VIA_REG_SGD_STAT_CP_EOL	(1<<5)
+#define   VIA_REG_SGD_STAT_FM_EOL	(1<<6)
+#define   VIA_REG_SGD_STAT_PB_STOP	(1<<8)
+#define   VIA_REG_SGD_STAT_CP_STOP	(1<<9)
+#define   VIA_REG_SGD_STAT_FM_STOP	(1<<10)
+#define   VIA_REG_SGD_STAT_PB_ACTIVE	(1<<12)
+#define   VIA_REG_SGD_STAT_CP_ACTIVE	(1<<13)
+#define   VIA_REG_SGD_STAT_FM_ACTIVE	(1<<14)
+#define   VIA_REG_SGD_STAT_MR_FLAG      (1<<16)
+#define   VIA_REG_SGD_STAT_MW_FLAG      (1<<17)
+#define   VIA_REG_SGD_STAT_MR_EOL       (1<<20)
+#define   VIA_REG_SGD_STAT_MW_EOL       (1<<21)
+#define   VIA_REG_SGD_STAT_MR_STOP      (1<<24)
+#define   VIA_REG_SGD_STAT_MW_STOP      (1<<25)
+#define   VIA_REG_SGD_STAT_MR_ACTIVE    (1<<28)
+#define   VIA_REG_SGD_STAT_MW_ACTIVE    (1<<29)
+
+#define VIA_REG_GPI_STATUS		0x88
+#define VIA_REG_GPI_INTR		0x8c
+
+#define VIA_TBL_BIT_FLAG	0x40000000
+#define VIA_TBL_BIT_EOL		0x80000000
+
+/* pci space */
+#define VIA_ACLINK_STAT		0x40
+#define  VIA_ACLINK_C11_READY	0x20
+#define  VIA_ACLINK_C10_READY	0x10
+#define  VIA_ACLINK_C01_READY	0x04 /* secondary codec ready */
+#define  VIA_ACLINK_LOWPOWER	0x02 /* low-power state */
+#define  VIA_ACLINK_C00_READY	0x01 /* primary codec ready */
+#define VIA_ACLINK_CTRL		0x41
+#define  VIA_ACLINK_CTRL_ENABLE	0x80 /* 0: disable, 1: enable */
+#define  VIA_ACLINK_CTRL_RESET	0x40 /* 0: assert, 1: de-assert */
+#define  VIA_ACLINK_CTRL_SYNC	0x20 /* 0: release SYNC, 1: force SYNC hi */
+#define  VIA_ACLINK_CTRL_SDO	0x10 /* 0: release SDO, 1: force SDO hi */
+#define  VIA_ACLINK_CTRL_VRA	0x08 /* 0: disable VRA, 1: enable VRA */
+#define  VIA_ACLINK_CTRL_PCM	0x04 /* 0: disable PCM, 1: enable PCM */
+#define  VIA_ACLINK_CTRL_FM	0x02 /* via686 only */
+#define  VIA_ACLINK_CTRL_SB	0x01 /* via686 only */
+#define  VIA_ACLINK_CTRL_INIT	(VIA_ACLINK_CTRL_ENABLE|\
+				 VIA_ACLINK_CTRL_RESET|\
+				 VIA_ACLINK_CTRL_PCM)
+#define VIA_FUNC_ENABLE		0x42
+#define  VIA_FUNC_MIDI_PNP	0x80 /* FIXME: it's 0x40 in the datasheet! */
+#define  VIA_FUNC_MIDI_IRQMASK	0x40 /* FIXME: not documented! */
+#define  VIA_FUNC_RX2C_WRITE	0x20
+#define  VIA_FUNC_SB_FIFO_EMPTY	0x10
+#define  VIA_FUNC_ENABLE_GAME	0x08
+#define  VIA_FUNC_ENABLE_FM	0x04
+#define  VIA_FUNC_ENABLE_MIDI	0x02
+#define  VIA_FUNC_ENABLE_SB	0x01
+#define VIA_PNP_CONTROL		0x43
+#define VIA_MC97_CTRL		0x44
+#define  VIA_MC97_CTRL_ENABLE   0x80
+#define  VIA_MC97_CTRL_SECONDARY 0x40
+#define  VIA_MC97_CTRL_INIT     (VIA_MC97_CTRL_ENABLE|\
+                                 VIA_MC97_CTRL_SECONDARY)
+
+
+/*
+ * pcm stream
+ */
+
+struct snd_via_sg_table {
+	unsigned int offset;
+	unsigned int size;
+} ;
+
+#define VIA_TABLE_SIZE	255
+
+struct viadev {
+	unsigned int reg_offset;
+	unsigned long port;
+	int direction;	/* playback = 0, capture = 1 */
+        struct snd_pcm_substream *substream;
+	int running;
+	unsigned int tbl_entries; /* # descriptors */
+	struct snd_dma_buffer table;
+	struct snd_via_sg_table *idx_table;
+	/* for recovery from the unexpected pointer */
+	unsigned int lastpos;
+	unsigned int bufsize;
+	unsigned int bufsize2;
+};
+
+enum { TYPE_CARD_VIA82XX_MODEM = 1 };
+
+#define VIA_MAX_MODEM_DEVS	2
+
+struct via82xx_modem {
+	int irq;
+
+	unsigned long port;
+
+	unsigned int intr_mask; /* SGD_SHADOW mask to check interrupts */
+
+	struct pci_dev *pci;
+	struct snd_card *card;
+
+	unsigned int num_devs;
+	unsigned int playback_devno, capture_devno;
+	struct viadev devs[VIA_MAX_MODEM_DEVS];
+
+	struct snd_pcm *pcms[2];
+
+	struct snd_ac97_bus *ac97_bus;
+	struct snd_ac97 *ac97;
+	unsigned int ac97_clock;
+	unsigned int ac97_secondary;	/* secondary AC'97 codec is present */
+
+	spinlock_t reg_lock;
+	struct snd_info_entry *proc_entry;
+};
+
+static const struct pci_device_id snd_via82xx_modem_ids[] = {
+	{ PCI_VDEVICE(VIA, 0x3068), TYPE_CARD_VIA82XX_MODEM, },
+	{ 0, }
+};
+
+MODULE_DEVICE_TABLE(pci, snd_via82xx_modem_ids);
+
+/*
+ */
+
+/*
+ * allocate and initialize the descriptor buffers
+ * periods = number of periods
+ * fragsize = period size in bytes
+ */
+static int build_via_table(struct viadev *dev, struct snd_pcm_substream *substream,
+			   struct pci_dev *pci,
+			   unsigned int periods, unsigned int fragsize)
+{
+	unsigned int i, idx, ofs, rest;
+	struct via82xx_modem *chip = snd_pcm_substream_chip(substream);
+	__le32 *pgtbl;
+
+	if (dev->table.area == NULL) {
+		/* the start of each lists must be aligned to 8 bytes,
+		 * but the kernel pages are much bigger, so we don't care
+		 */
+		if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, &chip->pci->dev,
+					PAGE_ALIGN(VIA_TABLE_SIZE * 2 * 8),
+					&dev->table) < 0)
+			return -ENOMEM;
+	}
+	if (! dev->idx_table) {
+		dev->idx_table = kmalloc_array(VIA_TABLE_SIZE,
+					       sizeof(*dev->idx_table),
+					       GFP_KERNEL);
+		if (! dev->idx_table)
+			return -ENOMEM;
+	}
+
+	/* fill the entries */
+	idx = 0;
+	ofs = 0;
+	pgtbl = (__le32 *)dev->table.area;
+	for (i = 0; i < periods; i++) {
+		rest = fragsize;
+		/* fill descriptors for a period.
+		 * a period can be split to several descriptors if it's
+		 * over page boundary.
+		 */
+		do {
+			unsigned int r;
+			unsigned int flag;
+			unsigned int addr;
+
+			if (idx >= VIA_TABLE_SIZE) {
+				dev_err(&pci->dev, "too much table size!\n");
+				return -EINVAL;
+			}
+			addr = snd_pcm_sgbuf_get_addr(substream, ofs);
+			pgtbl[idx << 1] = cpu_to_le32(addr);
+			r = PAGE_SIZE - (ofs % PAGE_SIZE);
+			if (rest < r)
+				r = rest;
+			rest -= r;
+			if (! rest) {
+				if (i == periods - 1)
+					flag = VIA_TBL_BIT_EOL; /* buffer boundary */
+				else
+					flag = VIA_TBL_BIT_FLAG; /* period boundary */
+			} else
+				flag = 0; /* period continues to the next */
+			/*
+			dev_dbg(&pci->dev,
+				"tbl %d: at %d  size %d (rest %d)\n",
+				idx, ofs, r, rest);
+			*/
+			pgtbl[(idx<<1) + 1] = cpu_to_le32(r | flag);
+			dev->idx_table[idx].offset = ofs;
+			dev->idx_table[idx].size = r;
+			ofs += r;
+			idx++;
+		} while (rest > 0);
+	}
+	dev->tbl_entries = idx;
+	dev->bufsize = periods * fragsize;
+	dev->bufsize2 = dev->bufsize / 2;
+	return 0;
+}
+
+
+static int clean_via_table(struct viadev *dev, struct snd_pcm_substream *substream,
+			   struct pci_dev *pci)
+{
+	if (dev->table.area) {
+		snd_dma_free_pages(&dev->table);
+		dev->table.area = NULL;
+	}
+	kfree(dev->idx_table);
+	dev->idx_table = NULL;
+	return 0;
+}
+
+/*
+ *  Basic I/O
+ */
+
+static inline unsigned int snd_via82xx_codec_xread(struct via82xx_modem *chip)
+{
+	return inl(VIAREG(chip, AC97));
+}
+ 
+static inline void snd_via82xx_codec_xwrite(struct via82xx_modem *chip, unsigned int val)
+{
+	outl(val, VIAREG(chip, AC97));
+}
+ 
+static int snd_via82xx_codec_ready(struct via82xx_modem *chip, int secondary)
+{
+	unsigned int timeout = 1000;	/* 1ms */
+	unsigned int val;
+	
+	while (timeout-- > 0) {
+		udelay(1);
+		val = snd_via82xx_codec_xread(chip);
+		if (!(val & VIA_REG_AC97_BUSY))
+			return val & 0xffff;
+	}
+	dev_err(chip->card->dev, "codec_ready: codec %i is not ready [0x%x]\n",
+		   secondary, snd_via82xx_codec_xread(chip));
+	return -EIO;
+}
+ 
+static int snd_via82xx_codec_valid(struct via82xx_modem *chip, int secondary)
+{
+	unsigned int timeout = 1000;	/* 1ms */
+	unsigned int val, val1;
+	unsigned int stat = !secondary ? VIA_REG_AC97_PRIMARY_VALID :
+					 VIA_REG_AC97_SECONDARY_VALID;
+	
+	while (timeout-- > 0) {
+		val = snd_via82xx_codec_xread(chip);
+		val1 = val & (VIA_REG_AC97_BUSY | stat);
+		if (val1 == stat)
+			return val & 0xffff;
+		udelay(1);
+	}
+	return -EIO;
+}
+ 
+static void snd_via82xx_codec_wait(struct snd_ac97 *ac97)
+{
+	struct via82xx_modem *chip = ac97->private_data;
+	__always_unused int err;
+	err = snd_via82xx_codec_ready(chip, ac97->num);
+	/* here we need to wait fairly for long time.. */
+	msleep(500);
+}
+
+static void snd_via82xx_codec_write(struct snd_ac97 *ac97,
+				    unsigned short reg,
+				    unsigned short val)
+{
+	struct via82xx_modem *chip = ac97->private_data;
+	unsigned int xval;
+	if(reg == AC97_GPIO_STATUS) {
+		outl(val, VIAREG(chip, GPI_STATUS));
+		return;
+	}	
+	xval = !ac97->num ? VIA_REG_AC97_CODEC_ID_PRIMARY : VIA_REG_AC97_CODEC_ID_SECONDARY;
+	xval <<= VIA_REG_AC97_CODEC_ID_SHIFT;
+	xval |= reg << VIA_REG_AC97_CMD_SHIFT;
+	xval |= val << VIA_REG_AC97_DATA_SHIFT;
+	snd_via82xx_codec_xwrite(chip, xval);
+	snd_via82xx_codec_ready(chip, ac97->num);
+}
+
+static unsigned short snd_via82xx_codec_read(struct snd_ac97 *ac97, unsigned short reg)
+{
+	struct via82xx_modem *chip = ac97->private_data;
+	unsigned int xval, val = 0xffff;
+	int again = 0;
+
+	xval = ac97->num << VIA_REG_AC97_CODEC_ID_SHIFT;
+	xval |= ac97->num ? VIA_REG_AC97_SECONDARY_VALID : VIA_REG_AC97_PRIMARY_VALID;
+	xval |= VIA_REG_AC97_READ;
+	xval |= (reg & 0x7f) << VIA_REG_AC97_CMD_SHIFT;
+      	while (1) {
+      		if (again++ > 3) {
+			dev_err(chip->card->dev,
+				"codec_read: codec %i is not valid [0x%x]\n",
+				   ac97->num, snd_via82xx_codec_xread(chip));
+		      	return 0xffff;
+		}
+		snd_via82xx_codec_xwrite(chip, xval);
+		udelay (20);
+		if (snd_via82xx_codec_valid(chip, ac97->num) >= 0) {
+			udelay(25);
+			val = snd_via82xx_codec_xread(chip);
+			break;
+		}
+	}
+	return val & 0xffff;
+}
+
+static void snd_via82xx_channel_reset(struct via82xx_modem *chip, struct viadev *viadev)
+{
+	outb(VIA_REG_CTRL_PAUSE | VIA_REG_CTRL_TERMINATE | VIA_REG_CTRL_RESET,
+	     VIADEV_REG(viadev, OFFSET_CONTROL));
+	inb(VIADEV_REG(viadev, OFFSET_CONTROL));
+	udelay(50);
+	/* disable interrupts */
+	outb(0x00, VIADEV_REG(viadev, OFFSET_CONTROL));
+	/* clear interrupts */
+	outb(0x03, VIADEV_REG(viadev, OFFSET_STATUS));
+	outb(0x00, VIADEV_REG(viadev, OFFSET_TYPE)); /* for via686 */
+	// outl(0, VIADEV_REG(viadev, OFFSET_CURR_PTR));
+	viadev->lastpos = 0;
+}
+
+
+/*
+ *  Interrupt handler
+ */
+
+static irqreturn_t snd_via82xx_interrupt(int irq, void *dev_id)
+{
+	struct via82xx_modem *chip = dev_id;
+	unsigned int status;
+	unsigned int i;
+
+	status = inl(VIAREG(chip, SGD_SHADOW));
+	if (! (status & chip->intr_mask)) {
+		return IRQ_NONE;
+	}
+// _skip_sgd:
+
+	/* check status for each stream */
+	spin_lock(&chip->reg_lock);
+	for (i = 0; i < chip->num_devs; i++) {
+		struct viadev *viadev = &chip->devs[i];
+		unsigned char c_status = inb(VIADEV_REG(viadev, OFFSET_STATUS));
+		c_status &= (VIA_REG_STAT_EOL|VIA_REG_STAT_FLAG|VIA_REG_STAT_STOPPED);
+		if (! c_status)
+			continue;
+		if (viadev->substream && viadev->running) {
+			spin_unlock(&chip->reg_lock);
+			snd_pcm_period_elapsed(viadev->substream);
+			spin_lock(&chip->reg_lock);
+		}
+		outb(c_status, VIADEV_REG(viadev, OFFSET_STATUS)); /* ack */
+	}
+	spin_unlock(&chip->reg_lock);
+	return IRQ_HANDLED;
+}
+
+/*
+ *  PCM callbacks
+ */
+
+/*
+ * trigger callback
+ */
+static int snd_via82xx_pcm_trigger(struct snd_pcm_substream *substream, int cmd)
+{
+	struct via82xx_modem *chip = snd_pcm_substream_chip(substream);
+	struct viadev *viadev = substream->runtime->private_data;
+	unsigned char val = 0;
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+		val |= VIA_REG_CTRL_START;
+		viadev->running = 1;
+		break;
+	case SNDRV_PCM_TRIGGER_STOP:
+		val = VIA_REG_CTRL_TERMINATE;
+		viadev->running = 0;
+		break;
+	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+		val |= VIA_REG_CTRL_PAUSE;
+		viadev->running = 0;
+		break;
+	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+		viadev->running = 1;
+		break;
+	default:
+		return -EINVAL;
+	}
+	outb(val, VIADEV_REG(viadev, OFFSET_CONTROL));
+	if (cmd == SNDRV_PCM_TRIGGER_STOP)
+		snd_via82xx_channel_reset(chip, viadev);
+	return 0;
+}
+
+/*
+ * pointer callbacks
+ */
+
+/*
+ * calculate the linear position at the given sg-buffer index and the rest count
+ */
+
+#define check_invalid_pos(viadev,pos) \
+	((pos) < viadev->lastpos && ((pos) >= viadev->bufsize2 ||\
+				     viadev->lastpos < viadev->bufsize2))
+
+static inline unsigned int calc_linear_pos(struct via82xx_modem *chip,
+					   struct viadev *viadev,
+					   unsigned int idx,
+					   unsigned int count)
+{
+	unsigned int size, res;
+
+	size = viadev->idx_table[idx].size;
+	res = viadev->idx_table[idx].offset + size - count;
+
+	/* check the validity of the calculated position */
+	if (size < count) {
+		dev_err(chip->card->dev,
+			"invalid via82xx_cur_ptr (size = %d, count = %d)\n",
+			   (int)size, (int)count);
+		res = viadev->lastpos;
+	} else if (check_invalid_pos(viadev, res)) {
+#ifdef POINTER_DEBUG
+		dev_dbg(chip->card->dev,
+			"fail: idx = %i/%i, lastpos = 0x%x, bufsize2 = 0x%x, offsize = 0x%x, size = 0x%x, count = 0x%x\n",
+			idx, viadev->tbl_entries, viadev->lastpos,
+		       viadev->bufsize2, viadev->idx_table[idx].offset,
+		       viadev->idx_table[idx].size, count);
+#endif
+		if (count && size < count) {
+			dev_dbg(chip->card->dev,
+				"invalid via82xx_cur_ptr, using last valid pointer\n");
+			res = viadev->lastpos;
+		} else {
+			if (! count)
+				/* bogus count 0 on the DMA boundary? */
+				res = viadev->idx_table[idx].offset;
+			else
+				/* count register returns full size
+				 * when end of buffer is reached
+				 */
+				res = viadev->idx_table[idx].offset + size;
+			if (check_invalid_pos(viadev, res)) {
+				dev_dbg(chip->card->dev,
+					"invalid via82xx_cur_ptr (2), using last valid pointer\n");
+				res = viadev->lastpos;
+			}
+		}
+	}
+	viadev->lastpos = res; /* remember the last position */
+	if (res >= viadev->bufsize)
+		res -= viadev->bufsize;
+	return res;
+}
+
+/*
+ * get the current pointer on via686
+ */
+static snd_pcm_uframes_t snd_via686_pcm_pointer(struct snd_pcm_substream *substream)
+{
+	struct via82xx_modem *chip = snd_pcm_substream_chip(substream);
+	struct viadev *viadev = substream->runtime->private_data;
+	unsigned int idx, ptr, count, res;
+
+	if (snd_BUG_ON(!viadev->tbl_entries))
+		return 0;
+	if (!(inb(VIADEV_REG(viadev, OFFSET_STATUS)) & VIA_REG_STAT_ACTIVE))
+		return 0;
+
+	spin_lock(&chip->reg_lock);
+	count = inl(VIADEV_REG(viadev, OFFSET_CURR_COUNT)) & 0xffffff;
+	/* The via686a does not have the current index register,
+	 * so we need to calculate the index from CURR_PTR.
+	 */
+	ptr = inl(VIADEV_REG(viadev, OFFSET_CURR_PTR));
+	if (ptr <= (unsigned int)viadev->table.addr)
+		idx = 0;
+	else /* CURR_PTR holds the address + 8 */
+		idx = ((ptr - (unsigned int)viadev->table.addr) / 8 - 1) %
+			viadev->tbl_entries;
+	res = calc_linear_pos(chip, viadev, idx, count);
+	spin_unlock(&chip->reg_lock);
+
+	return bytes_to_frames(substream->runtime, res);
+}
+
+/*
+ * hw_params callback:
+ * allocate the buffer and build up the buffer description table
+ */
+static int snd_via82xx_hw_params(struct snd_pcm_substream *substream,
+				 struct snd_pcm_hw_params *hw_params)
+{
+	struct via82xx_modem *chip = snd_pcm_substream_chip(substream);
+	struct viadev *viadev = substream->runtime->private_data;
+	int err;
+
+	err = build_via_table(viadev, substream, chip->pci,
+			      params_periods(hw_params),
+			      params_period_bytes(hw_params));
+	if (err < 0)
+		return err;
+
+	snd_ac97_write(chip->ac97, AC97_LINE1_RATE, params_rate(hw_params));
+	snd_ac97_write(chip->ac97, AC97_LINE1_LEVEL, 0);
+
+	return 0;
+}
+
+/*
+ * hw_free callback:
+ * clean up the buffer description table and release the buffer
+ */
+static int snd_via82xx_hw_free(struct snd_pcm_substream *substream)
+{
+	struct via82xx_modem *chip = snd_pcm_substream_chip(substream);
+	struct viadev *viadev = substream->runtime->private_data;
+
+	clean_via_table(viadev, substream, chip->pci);
+	return 0;
+}
+
+
+/*
+ * set up the table pointer
+ */
+static void snd_via82xx_set_table_ptr(struct via82xx_modem *chip, struct viadev *viadev)
+{
+	snd_via82xx_codec_ready(chip, chip->ac97_secondary);
+	outl((u32)viadev->table.addr, VIADEV_REG(viadev, OFFSET_TABLE_PTR));
+	udelay(20);
+	snd_via82xx_codec_ready(chip, chip->ac97_secondary);
+}
+
+/*
+ * prepare callback for playback and capture
+ */
+static int snd_via82xx_pcm_prepare(struct snd_pcm_substream *substream)
+{
+	struct via82xx_modem *chip = snd_pcm_substream_chip(substream);
+	struct viadev *viadev = substream->runtime->private_data;
+
+	snd_via82xx_channel_reset(chip, viadev);
+	/* this must be set after channel_reset */
+	snd_via82xx_set_table_ptr(chip, viadev);
+	outb(VIA_REG_TYPE_AUTOSTART|VIA_REG_TYPE_INT_EOL|VIA_REG_TYPE_INT_FLAG,
+	     VIADEV_REG(viadev, OFFSET_TYPE));
+	return 0;
+}
+
+/*
+ * pcm hardware definition, identical for both playback and capture
+ */
+static const struct snd_pcm_hardware snd_via82xx_hw =
+{
+	.info =			(SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_INTERLEAVED |
+				 SNDRV_PCM_INFO_BLOCK_TRANSFER |
+				 SNDRV_PCM_INFO_MMAP_VALID |
+				 /* SNDRV_PCM_INFO_RESUME | */
+				 SNDRV_PCM_INFO_PAUSE),
+	.formats =		SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE,
+	.rates =		SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_KNOT,
+	.rate_min =		8000,
+	.rate_max =		16000,
+	.channels_min =		1,
+	.channels_max =		1,
+	.buffer_bytes_max =	128 * 1024,
+	.period_bytes_min =	32,
+	.period_bytes_max =	128 * 1024,
+	.periods_min =		2,
+	.periods_max =		VIA_TABLE_SIZE / 2,
+	.fifo_size =		0,
+};
+
+
+/*
+ * open callback skeleton
+ */
+static int snd_via82xx_modem_pcm_open(struct via82xx_modem *chip, struct viadev *viadev,
+				      struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	int err;
+	static const unsigned int rates[] = { 8000,  9600, 12000, 16000 };
+	static const struct snd_pcm_hw_constraint_list hw_constraints_rates = {
+                .count = ARRAY_SIZE(rates),
+                .list = rates,
+                .mask = 0,
+        };
+
+	runtime->hw = snd_via82xx_hw;
+	
+	err = snd_pcm_hw_constraint_list(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
+					 &hw_constraints_rates);
+	if (err < 0)
+                return err;
+
+	/* we may remove following constaint when we modify table entries
+	   in interrupt */
+	err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
+	if (err < 0)
+		return err;
+
+	runtime->private_data = viadev;
+	viadev->substream = substream;
+
+	return 0;
+}
+
+
+/*
+ * open callback for playback
+ */
+static int snd_via82xx_playback_open(struct snd_pcm_substream *substream)
+{
+	struct via82xx_modem *chip = snd_pcm_substream_chip(substream);
+	struct viadev *viadev = &chip->devs[chip->playback_devno + substream->number];
+
+	return snd_via82xx_modem_pcm_open(chip, viadev, substream);
+}
+
+/*
+ * open callback for capture
+ */
+static int snd_via82xx_capture_open(struct snd_pcm_substream *substream)
+{
+	struct via82xx_modem *chip = snd_pcm_substream_chip(substream);
+	struct viadev *viadev = &chip->devs[chip->capture_devno + substream->pcm->device];
+
+	return snd_via82xx_modem_pcm_open(chip, viadev, substream);
+}
+
+/*
+ * close callback
+ */
+static int snd_via82xx_pcm_close(struct snd_pcm_substream *substream)
+{
+	struct viadev *viadev = substream->runtime->private_data;
+
+	viadev->substream = NULL;
+	return 0;
+}
+
+
+/* via686 playback callbacks */
+static const struct snd_pcm_ops snd_via686_playback_ops = {
+	.open =		snd_via82xx_playback_open,
+	.close =	snd_via82xx_pcm_close,
+	.hw_params =	snd_via82xx_hw_params,
+	.hw_free =	snd_via82xx_hw_free,
+	.prepare =	snd_via82xx_pcm_prepare,
+	.trigger =	snd_via82xx_pcm_trigger,
+	.pointer =	snd_via686_pcm_pointer,
+};
+
+/* via686 capture callbacks */
+static const struct snd_pcm_ops snd_via686_capture_ops = {
+	.open =		snd_via82xx_capture_open,
+	.close =	snd_via82xx_pcm_close,
+	.hw_params =	snd_via82xx_hw_params,
+	.hw_free =	snd_via82xx_hw_free,
+	.prepare =	snd_via82xx_pcm_prepare,
+	.trigger =	snd_via82xx_pcm_trigger,
+	.pointer =	snd_via686_pcm_pointer,
+};
+
+
+static void init_viadev(struct via82xx_modem *chip, int idx, unsigned int reg_offset,
+			int direction)
+{
+	chip->devs[idx].reg_offset = reg_offset;
+	chip->devs[idx].direction = direction;
+	chip->devs[idx].port = chip->port + reg_offset;
+}
+
+/*
+ * create a pcm instance for via686a/b
+ */
+static int snd_via686_pcm_new(struct via82xx_modem *chip)
+{
+	struct snd_pcm *pcm;
+	int err;
+
+	chip->playback_devno = 0;
+	chip->capture_devno = 1;
+	chip->num_devs = 2;
+	chip->intr_mask = 0x330000; /* FLAGS | EOL for MR, MW */
+
+	err = snd_pcm_new(chip->card, chip->card->shortname, 0, 1, 1, &pcm);
+	if (err < 0)
+		return err;
+	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_via686_playback_ops);
+	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_via686_capture_ops);
+	pcm->dev_class = SNDRV_PCM_CLASS_MODEM;
+	pcm->private_data = chip;
+	strcpy(pcm->name, chip->card->shortname);
+	chip->pcms[0] = pcm;
+	init_viadev(chip, 0, VIA_REG_MO_STATUS, 0);
+	init_viadev(chip, 1, VIA_REG_MI_STATUS, 1);
+
+	snd_pcm_set_managed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV_SG,
+				       &chip->pci->dev, 64*1024, 128*1024);
+	return 0;
+}
+
+
+/*
+ *  Mixer part
+ */
+
+
+static void snd_via82xx_mixer_free_ac97_bus(struct snd_ac97_bus *bus)
+{
+	struct via82xx_modem *chip = bus->private_data;
+	chip->ac97_bus = NULL;
+}
+
+static void snd_via82xx_mixer_free_ac97(struct snd_ac97 *ac97)
+{
+	struct via82xx_modem *chip = ac97->private_data;
+	chip->ac97 = NULL;
+}
+
+
+static int snd_via82xx_mixer_new(struct via82xx_modem *chip)
+{
+	struct snd_ac97_template ac97;
+	int err;
+	static const struct snd_ac97_bus_ops ops = {
+		.write = snd_via82xx_codec_write,
+		.read = snd_via82xx_codec_read,
+		.wait = snd_via82xx_codec_wait,
+	};
+
+	err = snd_ac97_bus(chip->card, 0, &ops, chip, &chip->ac97_bus);
+	if (err < 0)
+		return err;
+	chip->ac97_bus->private_free = snd_via82xx_mixer_free_ac97_bus;
+	chip->ac97_bus->clock = chip->ac97_clock;
+
+	memset(&ac97, 0, sizeof(ac97));
+	ac97.private_data = chip;
+	ac97.private_free = snd_via82xx_mixer_free_ac97;
+	ac97.pci = chip->pci;
+	ac97.scaps = AC97_SCAP_SKIP_AUDIO | AC97_SCAP_POWER_SAVE;
+	ac97.num = chip->ac97_secondary;
+
+	err = snd_ac97_mixer(chip->ac97_bus, &ac97, &chip->ac97);
+	if (err < 0)
+		return err;
+
+	return 0;
+}
+
+
+/*
+ * proc interface
+ */
+static void snd_via82xx_proc_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer)
+{
+	struct via82xx_modem *chip = entry->private_data;
+	int i;
+	
+	snd_iprintf(buffer, "%s\n\n", chip->card->longname);
+	for (i = 0; i < 0xa0; i += 4) {
+		snd_iprintf(buffer, "%02x: %08x\n", i, inl(chip->port + i));
+	}
+}
+
+static void snd_via82xx_proc_init(struct via82xx_modem *chip)
+{
+	snd_card_ro_proc_new(chip->card, "via82xx", chip,
+			     snd_via82xx_proc_read);
+}
+
+/*
+ *
+ */
+
+static int snd_via82xx_chip_init(struct via82xx_modem *chip)
+{
+	unsigned int val;
+	unsigned long end_time;
+	unsigned char pval;
+
+	pci_read_config_byte(chip->pci, VIA_MC97_CTRL, &pval);
+	if((pval & VIA_MC97_CTRL_INIT) != VIA_MC97_CTRL_INIT) {
+		pci_write_config_byte(chip->pci, 0x44, pval|VIA_MC97_CTRL_INIT);
+		udelay(100);
+	}
+
+	pci_read_config_byte(chip->pci, VIA_ACLINK_STAT, &pval);
+	if (! (pval & VIA_ACLINK_C00_READY)) { /* codec not ready? */
+		/* deassert ACLink reset, force SYNC */
+		pci_write_config_byte(chip->pci, VIA_ACLINK_CTRL,
+				      VIA_ACLINK_CTRL_ENABLE |
+				      VIA_ACLINK_CTRL_RESET |
+				      VIA_ACLINK_CTRL_SYNC);
+		udelay(100);
+#if 1 /* FIXME: should we do full reset here for all chip models? */
+		pci_write_config_byte(chip->pci, VIA_ACLINK_CTRL, 0x00);
+		udelay(100);
+#else
+		/* deassert ACLink reset, force SYNC (warm AC'97 reset) */
+		pci_write_config_byte(chip->pci, VIA_ACLINK_CTRL,
+				      VIA_ACLINK_CTRL_RESET|VIA_ACLINK_CTRL_SYNC);
+		udelay(2);
+#endif
+		/* ACLink on, deassert ACLink reset, VSR, SGD data out */
+		pci_write_config_byte(chip->pci, VIA_ACLINK_CTRL, VIA_ACLINK_CTRL_INIT);
+		udelay(100);
+	}
+	
+	pci_read_config_byte(chip->pci, VIA_ACLINK_CTRL, &pval);
+	if ((pval & VIA_ACLINK_CTRL_INIT) != VIA_ACLINK_CTRL_INIT) {
+		/* ACLink on, deassert ACLink reset, VSR, SGD data out */
+		pci_write_config_byte(chip->pci, VIA_ACLINK_CTRL, VIA_ACLINK_CTRL_INIT);
+		udelay(100);
+	}
+
+	/* wait until codec ready */
+	end_time = jiffies + msecs_to_jiffies(750);
+	do {
+		pci_read_config_byte(chip->pci, VIA_ACLINK_STAT, &pval);
+		if (pval & VIA_ACLINK_C00_READY) /* primary codec ready */
+			break;
+		schedule_timeout_uninterruptible(1);
+	} while (time_before(jiffies, end_time));
+
+	val = snd_via82xx_codec_xread(chip);
+	if (val & VIA_REG_AC97_BUSY)
+		dev_err(chip->card->dev,
+			"AC'97 codec is not ready [0x%x]\n", val);
+
+	snd_via82xx_codec_xwrite(chip, VIA_REG_AC97_READ |
+				 VIA_REG_AC97_SECONDARY_VALID |
+				 (VIA_REG_AC97_CODEC_ID_SECONDARY << VIA_REG_AC97_CODEC_ID_SHIFT));
+	end_time = jiffies + msecs_to_jiffies(750);
+	snd_via82xx_codec_xwrite(chip, VIA_REG_AC97_READ |
+				 VIA_REG_AC97_SECONDARY_VALID |
+				 (VIA_REG_AC97_CODEC_ID_SECONDARY << VIA_REG_AC97_CODEC_ID_SHIFT));
+	do {
+		val = snd_via82xx_codec_xread(chip);
+		if (val & VIA_REG_AC97_SECONDARY_VALID) {
+			chip->ac97_secondary = 1;
+			goto __ac97_ok2;
+		}
+		schedule_timeout_uninterruptible(1);
+	} while (time_before(jiffies, end_time));
+	/* This is ok, the most of motherboards have only one codec */
+
+      __ac97_ok2:
+
+	/* route FM trap to IRQ, disable FM trap */
+	// pci_write_config_byte(chip->pci, VIA_FM_NMI_CTRL, 0);
+	/* disable all GPI interrupts */
+	outl(0, VIAREG(chip, GPI_INTR));
+
+	return 0;
+}
+
+#ifdef CONFIG_PM_SLEEP
+/*
+ * power management
+ */
+static int snd_via82xx_suspend(struct device *dev)
+{
+	struct snd_card *card = dev_get_drvdata(dev);
+	struct via82xx_modem *chip = card->private_data;
+	int i;
+
+	snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
+	for (i = 0; i < chip->num_devs; i++)
+		snd_via82xx_channel_reset(chip, &chip->devs[i]);
+	snd_ac97_suspend(chip->ac97);
+	return 0;
+}
+
+static int snd_via82xx_resume(struct device *dev)
+{
+	struct snd_card *card = dev_get_drvdata(dev);
+	struct via82xx_modem *chip = card->private_data;
+	int i;
+
+	snd_via82xx_chip_init(chip);
+
+	snd_ac97_resume(chip->ac97);
+
+	for (i = 0; i < chip->num_devs; i++)
+		snd_via82xx_channel_reset(chip, &chip->devs[i]);
+
+	snd_power_change_state(card, SNDRV_CTL_POWER_D0);
+	return 0;
+}
+
+static SIMPLE_DEV_PM_OPS(snd_via82xx_pm, snd_via82xx_suspend, snd_via82xx_resume);
+#define SND_VIA82XX_PM_OPS	&snd_via82xx_pm
+#else
+#define SND_VIA82XX_PM_OPS	NULL
+#endif /* CONFIG_PM_SLEEP */
+
+static void snd_via82xx_free(struct snd_card *card)
+{
+	struct via82xx_modem *chip = card->private_data;
+	unsigned int i;
+
+	/* disable interrupts */
+	for (i = 0; i < chip->num_devs; i++)
+		snd_via82xx_channel_reset(chip, &chip->devs[i]);
+}
+
+static int snd_via82xx_create(struct snd_card *card,
+			      struct pci_dev *pci,
+			      int chip_type,
+			      int revision,
+			      unsigned int ac97_clock)
+{
+	struct via82xx_modem *chip = card->private_data;
+	int err;
+
+	err = pcim_enable_device(pci);
+	if (err < 0)
+		return err;
+
+	spin_lock_init(&chip->reg_lock);
+	chip->card = card;
+	chip->pci = pci;
+	chip->irq = -1;
+
+	err = pci_request_regions(pci, card->driver);
+	if (err < 0)
+		return err;
+	chip->port = pci_resource_start(pci, 0);
+	if (devm_request_irq(&pci->dev, pci->irq, snd_via82xx_interrupt,
+			     IRQF_SHARED, KBUILD_MODNAME, chip)) {
+		dev_err(card->dev, "unable to grab IRQ %d\n", pci->irq);
+		return -EBUSY;
+	}
+	chip->irq = pci->irq;
+	card->sync_irq = chip->irq;
+	card->private_free = snd_via82xx_free;
+	if (ac97_clock >= 8000 && ac97_clock <= 48000)
+		chip->ac97_clock = ac97_clock;
+
+	err = snd_via82xx_chip_init(chip);
+	if (err < 0)
+		return err;
+
+	/* The 8233 ac97 controller does not implement the master bit
+	 * in the pci command register. IMHO this is a violation of the PCI spec.
+	 * We call pci_set_master here because it does not hurt. */
+	pci_set_master(pci);
+	return 0;
+}
+
+
+static int __snd_via82xx_probe(struct pci_dev *pci,
+			       const struct pci_device_id *pci_id)
+{
+	struct snd_card *card;
+	struct via82xx_modem *chip;
+	int chip_type = 0, card_type;
+	unsigned int i;
+	int err;
+
+	err = snd_devm_card_new(&pci->dev, index, id, THIS_MODULE,
+				sizeof(*chip), &card);
+	if (err < 0)
+		return err;
+	chip = card->private_data;
+
+	card_type = pci_id->driver_data;
+	switch (card_type) {
+	case TYPE_CARD_VIA82XX_MODEM:
+		strcpy(card->driver, "VIA82XX-MODEM");
+		sprintf(card->shortname, "VIA 82XX modem");
+		break;
+	default:
+		dev_err(card->dev, "invalid card type %d\n", card_type);
+		return -EINVAL;
+	}
+		
+	err = snd_via82xx_create(card, pci, chip_type, pci->revision,
+				 ac97_clock);
+	if (err < 0)
+		return err;
+	err = snd_via82xx_mixer_new(chip);
+	if (err < 0)
+		return err;
+
+	err = snd_via686_pcm_new(chip);
+	if (err < 0)
+		return err;
+
+	/* disable interrupts */
+	for (i = 0; i < chip->num_devs; i++)
+		snd_via82xx_channel_reset(chip, &chip->devs[i]);
+
+	sprintf(card->longname, "%s at 0x%lx, irq %d",
+		card->shortname, chip->port, chip->irq);
+
+	snd_via82xx_proc_init(chip);
+
+	err = snd_card_register(card);
+	if (err < 0)
+		return err;
+	pci_set_drvdata(pci, card);
+	return 0;
+}
+
+static int snd_via82xx_probe(struct pci_dev *pci,
+			     const struct pci_device_id *pci_id)
+{
+	return snd_card_free_on_error(&pci->dev, __snd_via82xx_probe(pci, pci_id));
+}
+
+static struct pci_driver via82xx_modem_driver = {
+	.name = KBUILD_MODNAME,
+	.id_table = snd_via82xx_modem_ids,
+	.probe = snd_via82xx_probe,
+	.driver = {
+		.pm = SND_VIA82XX_PM_OPS,
+	},
+};
+
+module_pci_driver(via82xx_modem_driver);