diff --git a/sound/pci/bt87x.c b/sound/pci/bt87x.c
new file mode 100644
index 0000000..89a7ffe
--- /dev/null
+++ b/sound/pci/bt87x.c
@@ -0,0 +1,930 @@
+/*
+ * bt87x.c - Brooktree Bt878/Bt879 driver for ALSA
+ *
+ * Copyright (c) Clemens Ladisch <clemens@ladisch.de>
+ *
+ * based on btaudio.c by Gerd Knorr <kraxel@bytesex.org>
+ *
+ *
+ *  This driver is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This driver 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 <sound/driver.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/pci.h>
+#include <linux/slab.h>
+#include <linux/moduleparam.h>
+#include <linux/bitops.h>
+#include <asm/io.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/control.h>
+#include <sound/initval.h>
+
+MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>");
+MODULE_DESCRIPTION("Brooktree Bt87x audio driver");
+MODULE_LICENSE("GPL");
+MODULE_SUPPORTED_DEVICE("{{Brooktree,Bt878},"
+		"{Brooktree,Bt879}}");
+
+static int index[SNDRV_CARDS] = {[0 ... (SNDRV_CARDS - 1)] = -2}; /* Exclude the first card */
+static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;	/* ID for this card */
+static int enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;	/* Enable this card */
+static int digital_rate[SNDRV_CARDS] = { [0 ... (SNDRV_CARDS-1)] = 0 }; /* digital input rate */
+static int load_all;	/* allow to load the non-whitelisted cards */
+
+module_param_array(index, int, NULL, 0444);
+MODULE_PARM_DESC(index, "Index value for Bt87x soundcard");
+module_param_array(id, charp, NULL, 0444);
+MODULE_PARM_DESC(id, "ID string for Bt87x soundcard");
+module_param_array(enable, bool, NULL, 0444);
+MODULE_PARM_DESC(enable, "Enable Bt87x soundcard");
+module_param_array(digital_rate, int, NULL, 0444);
+MODULE_PARM_DESC(digital_rate, "Digital input rate for Bt87x soundcard");
+module_param(load_all, bool, 0444);
+MODULE_PARM_DESC(load_all, "Allow to load the non-whitelisted cards");
+
+
+#ifndef PCI_VENDOR_ID_BROOKTREE
+#define PCI_VENDOR_ID_BROOKTREE 0x109e
+#endif
+#ifndef PCI_DEVICE_ID_BROOKTREE_878
+#define PCI_DEVICE_ID_BROOKTREE_878 0x0878
+#endif
+#ifndef PCI_DEVICE_ID_BROOKTREE_879
+#define PCI_DEVICE_ID_BROOKTREE_879 0x0879
+#endif
+
+/* register offsets */
+#define REG_INT_STAT		0x100	/* interrupt status */
+#define REG_INT_MASK		0x104	/* interrupt mask */
+#define REG_GPIO_DMA_CTL	0x10c	/* audio control */
+#define REG_PACKET_LEN		0x110	/* audio packet lengths */
+#define REG_RISC_STRT_ADD	0x114	/* RISC program start address */
+#define REG_RISC_COUNT		0x120	/* RISC program counter */
+
+/* interrupt bits */
+#define INT_OFLOW	(1 <<  3)	/* audio A/D overflow */
+#define INT_RISCI	(1 << 11)	/* RISC instruction IRQ bit set */
+#define INT_FBUS	(1 << 12)	/* FIFO overrun due to bus access latency */
+#define INT_FTRGT	(1 << 13)	/* FIFO overrun due to target latency */
+#define INT_FDSR	(1 << 14)	/* FIFO data stream resynchronization */
+#define INT_PPERR	(1 << 15)	/* PCI parity error */
+#define INT_RIPERR	(1 << 16)	/* RISC instruction parity error */
+#define INT_PABORT	(1 << 17)	/* PCI master or target abort */
+#define INT_OCERR	(1 << 18)	/* invalid opcode */
+#define INT_SCERR	(1 << 19)	/* sync counter overflow */
+#define INT_RISC_EN	(1 << 27)	/* DMA controller running */
+#define INT_RISCS_SHIFT	      28	/* RISC status bits */
+
+/* audio control bits */
+#define CTL_FIFO_ENABLE		(1 <<  0)	/* enable audio data FIFO */
+#define CTL_RISC_ENABLE		(1 <<  1)	/* enable audio DMA controller */
+#define CTL_PKTP_4		(0 <<  2)	/* packet mode FIFO trigger point - 4 DWORDs */
+#define CTL_PKTP_8		(1 <<  2)	/* 8 DWORDs */
+#define CTL_PKTP_16		(2 <<  2)	/* 16 DWORDs */
+#define CTL_ACAP_EN		(1 <<  4)	/* enable audio capture */
+#define CTL_DA_APP		(1 <<  5)	/* GPIO input */
+#define CTL_DA_IOM_AFE		(0 <<  6)	/* audio A/D input */
+#define CTL_DA_IOM_DA		(1 <<  6)	/* digital audio input */
+#define CTL_DA_SDR_SHIFT	       8	/* DDF first stage decimation rate */
+#define CTL_DA_SDR_MASK		(0xf<< 8)
+#define CTL_DA_LMT		(1 << 12)	/* limit audio data values */
+#define CTL_DA_ES2		(1 << 13)	/* enable DDF stage 2 */
+#define CTL_DA_SBR		(1 << 14)	/* samples rounded to 8 bits */
+#define CTL_DA_DPM		(1 << 15)	/* data packet mode */
+#define CTL_DA_LRD_SHIFT	      16	/* ALRCK delay */
+#define CTL_DA_MLB		(1 << 21)	/* MSB/LSB format */
+#define CTL_DA_LRI		(1 << 22)	/* left/right indication */
+#define CTL_DA_SCE		(1 << 23)	/* sample clock edge */
+#define CTL_A_SEL_STV		(0 << 24)	/* TV tuner audio input */
+#define CTL_A_SEL_SFM		(1 << 24)	/* FM audio input */
+#define CTL_A_SEL_SML		(2 << 24)	/* mic/line audio input */
+#define CTL_A_SEL_SMXC		(3 << 24)	/* MUX bypass */
+#define CTL_A_SEL_SHIFT		      24
+#define CTL_A_SEL_MASK		(3 << 24)
+#define CTL_A_PWRDN		(1 << 26)	/* analog audio power-down */
+#define CTL_A_G2X		(1 << 27)	/* audio gain boost */
+#define CTL_A_GAIN_SHIFT	      28	/* audio input gain */
+#define CTL_A_GAIN_MASK		(0xf<<28)
+
+/* RISC instruction opcodes */
+#define RISC_WRITE	(0x1 << 28)	/* write FIFO data to memory at address */
+#define RISC_WRITEC	(0x5 << 28)	/* write FIFO data to memory at current address */
+#define RISC_SKIP	(0x2 << 28)	/* skip FIFO data */
+#define RISC_JUMP	(0x7 << 28)	/* jump to address */
+#define RISC_SYNC	(0x8 << 28)	/* synchronize with FIFO */
+
+/* RISC instruction bits */
+#define RISC_BYTES_ENABLE	(0xf << 12)	/* byte enable bits */
+#define RISC_RESYNC		(  1 << 15)	/* disable FDSR errors */
+#define RISC_SET_STATUS_SHIFT	        16	/* set status bits */
+#define RISC_RESET_STATUS_SHIFT	        20	/* clear status bits */
+#define RISC_IRQ		(  1 << 24)	/* interrupt */
+#define RISC_EOL		(  1 << 26)	/* end of line */
+#define RISC_SOL		(  1 << 27)	/* start of line */
+
+/* SYNC status bits values */
+#define RISC_SYNC_FM1	0x6
+#define RISC_SYNC_VRO	0xc
+
+#define ANALOG_CLOCK 1792000
+#ifdef CONFIG_SND_BT87X_OVERCLOCK
+#define CLOCK_DIV_MIN 1
+#else
+#define CLOCK_DIV_MIN 4
+#endif
+#define CLOCK_DIV_MAX 15
+
+#define ERROR_INTERRUPTS (INT_FBUS | INT_FTRGT | INT_PPERR | \
+			  INT_RIPERR | INT_PABORT | INT_OCERR)
+#define MY_INTERRUPTS (INT_RISCI | ERROR_INTERRUPTS)
+
+/* SYNC, one WRITE per line, one extra WRITE per page boundary, SYNC, JUMP */
+#define MAX_RISC_SIZE ((1 + 255 + (PAGE_ALIGN(255 * 4092) / PAGE_SIZE - 1) + 1 + 1) * 8)
+
+typedef struct snd_bt87x bt87x_t;
+struct snd_bt87x {
+	snd_card_t *card;
+	struct pci_dev *pci;
+
+	void __iomem *mmio;
+	int irq;
+
+	int dig_rate;
+
+	spinlock_t reg_lock;
+	long opened;
+	snd_pcm_substream_t *substream;
+
+	struct snd_dma_buffer dma_risc;
+	unsigned int line_bytes;
+	unsigned int lines;
+
+	u32 reg_control;
+	u32 interrupt_mask;
+
+	int current_line;
+
+	int pci_parity_errors;
+};
+
+enum { DEVICE_DIGITAL, DEVICE_ANALOG };
+
+static inline u32 snd_bt87x_readl(bt87x_t *chip, u32 reg)
+{
+	return readl(chip->mmio + reg);
+}
+
+static inline void snd_bt87x_writel(bt87x_t *chip, u32 reg, u32 value)
+{
+	writel(value, chip->mmio + reg);
+}
+
+static int snd_bt87x_create_risc(bt87x_t *chip, snd_pcm_substream_t *substream,
+			       	 unsigned int periods, unsigned int period_bytes)
+{
+	struct snd_sg_buf *sgbuf = snd_pcm_substream_sgbuf(substream);
+	unsigned int i, offset;
+	u32 *risc;
+
+	if (chip->dma_risc.area == NULL) {
+		if (snd_dma_alloc_pages(SNDRV_DMA_TYPE_DEV, snd_dma_pci_data(chip->pci),
+					PAGE_ALIGN(MAX_RISC_SIZE), &chip->dma_risc) < 0)
+			return -ENOMEM;
+	}
+	risc = (u32 *)chip->dma_risc.area;
+	offset = 0;
+	*risc++ = cpu_to_le32(RISC_SYNC | RISC_SYNC_FM1);
+	*risc++ = cpu_to_le32(0);
+	for (i = 0; i < periods; ++i) {
+		u32 rest;
+
+		rest = period_bytes;
+		do {
+			u32 cmd, len;
+
+			len = PAGE_SIZE - (offset % PAGE_SIZE);
+			if (len > rest)
+				len = rest;
+			cmd = RISC_WRITE | len;
+			if (rest == period_bytes) {
+				u32 block = i * 16 / periods;
+				cmd |= RISC_SOL;
+				cmd |= block << RISC_SET_STATUS_SHIFT;
+				cmd |= (~block & 0xf) << RISC_RESET_STATUS_SHIFT;
+			}
+			if (len == rest)
+				cmd |= RISC_EOL | RISC_IRQ;
+			*risc++ = cpu_to_le32(cmd);
+			*risc++ = cpu_to_le32((u32)snd_pcm_sgbuf_get_addr(sgbuf, offset));
+			offset += len;
+			rest -= len;
+		} while (rest > 0);
+	}
+	*risc++ = cpu_to_le32(RISC_SYNC | RISC_SYNC_VRO);
+	*risc++ = cpu_to_le32(0);
+	*risc++ = cpu_to_le32(RISC_JUMP);
+	*risc++ = cpu_to_le32(chip->dma_risc.addr);
+	chip->line_bytes = period_bytes;
+	chip->lines = periods;
+	return 0;
+}
+
+static void snd_bt87x_free_risc(bt87x_t *chip)
+{
+	if (chip->dma_risc.area) {
+		snd_dma_free_pages(&chip->dma_risc);
+		chip->dma_risc.area = NULL;
+	}
+}
+
+static void snd_bt87x_pci_error(bt87x_t *chip, unsigned int status)
+{
+	u16 pci_status;
+
+	pci_read_config_word(chip->pci, PCI_STATUS, &pci_status);
+	pci_status &= PCI_STATUS_PARITY | PCI_STATUS_SIG_TARGET_ABORT |
+		PCI_STATUS_REC_TARGET_ABORT | PCI_STATUS_REC_MASTER_ABORT |
+		PCI_STATUS_SIG_SYSTEM_ERROR | PCI_STATUS_DETECTED_PARITY;
+	pci_write_config_word(chip->pci, PCI_STATUS, pci_status);
+	if (pci_status != PCI_STATUS_DETECTED_PARITY)
+		snd_printk(KERN_ERR "Aieee - PCI error! status %#08x, PCI status %#04x\n",
+			   status & ERROR_INTERRUPTS, pci_status);
+	else {
+		snd_printk(KERN_ERR "Aieee - PCI parity error detected!\n");
+		/* error 'handling' similar to aic7xxx_pci.c: */
+		chip->pci_parity_errors++;
+		if (chip->pci_parity_errors > 20) {
+			snd_printk(KERN_ERR "Too many PCI parity errors observed.\n");
+			snd_printk(KERN_ERR "Some device on this bus is generating bad parity.\n");
+			snd_printk(KERN_ERR "This is an error *observed by*, not *generated by*, this card.\n");
+			snd_printk(KERN_ERR "PCI parity error checking has been disabled.\n");
+			chip->interrupt_mask &= ~(INT_PPERR | INT_RIPERR);
+			snd_bt87x_writel(chip, REG_INT_MASK, chip->interrupt_mask);
+		}
+	}
+}
+
+static irqreturn_t snd_bt87x_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+	bt87x_t *chip = dev_id;
+	unsigned int status, irq_status;
+
+	status = snd_bt87x_readl(chip, REG_INT_STAT);
+	irq_status = status & chip->interrupt_mask;
+	if (!irq_status)
+		return IRQ_NONE;
+	snd_bt87x_writel(chip, REG_INT_STAT, irq_status);
+
+	if (irq_status & ERROR_INTERRUPTS) {
+		if (irq_status & (INT_FBUS | INT_FTRGT))
+			snd_printk(KERN_WARNING "FIFO overrun, status %#08x\n", status);
+		if (irq_status & INT_OCERR)
+			snd_printk(KERN_ERR "internal RISC error, status %#08x\n", status);
+		if (irq_status & (INT_PPERR | INT_RIPERR | INT_PABORT))
+			snd_bt87x_pci_error(chip, irq_status);
+	}
+	if ((irq_status & INT_RISCI) && (chip->reg_control & CTL_ACAP_EN)) {
+		int current_block, irq_block;
+
+		/* assume that exactly one line has been recorded */
+		chip->current_line = (chip->current_line + 1) % chip->lines;
+		/* but check if some interrupts have been skipped */
+		current_block = chip->current_line * 16 / chip->lines;
+		irq_block = status >> INT_RISCS_SHIFT;
+		if (current_block != irq_block)
+			chip->current_line = (irq_block * chip->lines + 15) / 16;
+
+		snd_pcm_period_elapsed(chip->substream);
+	}
+	return IRQ_HANDLED;
+}
+
+static snd_pcm_hardware_t snd_bt87x_digital_hw = {
+	.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,
+	.rates = 0, /* set at runtime */
+	.channels_min = 2,
+	.channels_max = 2,
+	.buffer_bytes_max = 255 * 4092,
+	.period_bytes_min = 32,
+	.period_bytes_max = 4092,
+	.periods_min = 2,
+	.periods_max = 255,
+};
+
+static snd_pcm_hardware_t snd_bt87x_analog_hw = {
+	.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_S8,
+	.rates = SNDRV_PCM_RATE_KNOT,
+	.rate_min = ANALOG_CLOCK / CLOCK_DIV_MAX,
+	.rate_max = ANALOG_CLOCK / CLOCK_DIV_MIN,
+	.channels_min = 1,
+	.channels_max = 1,
+	.buffer_bytes_max = 255 * 4092,
+	.period_bytes_min = 32,
+	.period_bytes_max = 4092,
+	.periods_min = 2,
+	.periods_max = 255,
+};
+
+static int snd_bt87x_set_digital_hw(bt87x_t *chip, snd_pcm_runtime_t *runtime)
+{
+	static struct {
+		int rate;
+		unsigned int bit;
+	} ratebits[] = {
+		{8000, SNDRV_PCM_RATE_8000},
+		{11025, SNDRV_PCM_RATE_11025},
+		{16000, SNDRV_PCM_RATE_16000},
+		{22050, SNDRV_PCM_RATE_22050},
+		{32000, SNDRV_PCM_RATE_32000},
+		{44100, SNDRV_PCM_RATE_44100},
+		{48000, SNDRV_PCM_RATE_48000}
+	};
+	int i;
+
+	chip->reg_control |= CTL_DA_IOM_DA;
+	runtime->hw = snd_bt87x_digital_hw;
+	runtime->hw.rates = SNDRV_PCM_RATE_KNOT;
+	for (i = 0; i < ARRAY_SIZE(ratebits); ++i)
+		if (chip->dig_rate == ratebits[i].rate) {
+			runtime->hw.rates = ratebits[i].bit;
+			break;
+		}
+	runtime->hw.rate_min = chip->dig_rate;
+	runtime->hw.rate_max = chip->dig_rate;
+	return 0;
+}
+
+static int snd_bt87x_set_analog_hw(bt87x_t *chip, snd_pcm_runtime_t *runtime)
+{
+	static ratnum_t analog_clock = {
+		.num = ANALOG_CLOCK,
+		.den_min = CLOCK_DIV_MIN,
+		.den_max = CLOCK_DIV_MAX,
+		.den_step = 1
+	};
+	static snd_pcm_hw_constraint_ratnums_t constraint_rates = {
+		.nrats = 1,
+		.rats = &analog_clock
+	};
+
+	chip->reg_control &= ~CTL_DA_IOM_DA;
+	runtime->hw = snd_bt87x_analog_hw;
+	return snd_pcm_hw_constraint_ratnums(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
+					     &constraint_rates);
+}
+
+static int snd_bt87x_pcm_open(snd_pcm_substream_t *substream)
+{
+	bt87x_t *chip = snd_pcm_substream_chip(substream);
+	snd_pcm_runtime_t *runtime = substream->runtime;
+	int err;
+
+	if (test_and_set_bit(0, &chip->opened))
+		return -EBUSY;
+
+	if (substream->pcm->device == DEVICE_DIGITAL)
+		err = snd_bt87x_set_digital_hw(chip, runtime);
+	else
+		err = snd_bt87x_set_analog_hw(chip, runtime);
+	if (err < 0)
+		goto _error;
+
+	err = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS);
+	if (err < 0)
+		goto _error;
+
+	chip->substream = substream;
+	return 0;
+
+_error:
+	clear_bit(0, &chip->opened);
+	smp_mb__after_clear_bit();
+	return err;
+}
+
+static int snd_bt87x_close(snd_pcm_substream_t *substream)
+{
+	bt87x_t *chip = snd_pcm_substream_chip(substream);
+
+	chip->substream = NULL;
+	clear_bit(0, &chip->opened);
+	smp_mb__after_clear_bit();
+	return 0;
+}
+
+static int snd_bt87x_hw_params(snd_pcm_substream_t *substream,
+			       snd_pcm_hw_params_t *hw_params)
+{
+	bt87x_t *chip = snd_pcm_substream_chip(substream);
+	int err;
+
+	err = snd_pcm_lib_malloc_pages(substream,
+				       params_buffer_bytes(hw_params));
+	if (err < 0)
+		return err;
+	return snd_bt87x_create_risc(chip, substream,
+				     params_periods(hw_params),
+				     params_period_bytes(hw_params));
+}
+
+static int snd_bt87x_hw_free(snd_pcm_substream_t *substream)
+{
+	bt87x_t *chip = snd_pcm_substream_chip(substream);
+
+	snd_bt87x_free_risc(chip);
+	snd_pcm_lib_free_pages(substream);
+	return 0;
+}
+
+static int snd_bt87x_prepare(snd_pcm_substream_t *substream)
+{
+	bt87x_t *chip = snd_pcm_substream_chip(substream);
+	snd_pcm_runtime_t *runtime = substream->runtime;
+	int decimation;
+
+	spin_lock_irq(&chip->reg_lock);
+	chip->reg_control &= ~(CTL_DA_SDR_MASK | CTL_DA_SBR);
+	decimation = (ANALOG_CLOCK + runtime->rate / 4) / runtime->rate;
+	chip->reg_control |= decimation << CTL_DA_SDR_SHIFT;
+	if (runtime->format == SNDRV_PCM_FORMAT_S8)
+		chip->reg_control |= CTL_DA_SBR;
+	snd_bt87x_writel(chip, REG_GPIO_DMA_CTL, chip->reg_control);
+	spin_unlock_irq(&chip->reg_lock);
+	return 0;
+}
+
+static int snd_bt87x_start(bt87x_t *chip)
+{
+	spin_lock(&chip->reg_lock);
+	chip->current_line = 0;
+	chip->reg_control |= CTL_FIFO_ENABLE | CTL_RISC_ENABLE | CTL_ACAP_EN;
+	snd_bt87x_writel(chip, REG_RISC_STRT_ADD, chip->dma_risc.addr);
+	snd_bt87x_writel(chip, REG_PACKET_LEN,
+			 chip->line_bytes | (chip->lines << 16));
+	snd_bt87x_writel(chip, REG_INT_MASK, chip->interrupt_mask);
+	snd_bt87x_writel(chip, REG_GPIO_DMA_CTL, chip->reg_control);
+	spin_unlock(&chip->reg_lock);
+	return 0;
+}
+
+static int snd_bt87x_stop(bt87x_t *chip)
+{
+	spin_lock(&chip->reg_lock);
+	chip->reg_control &= ~(CTL_FIFO_ENABLE | CTL_RISC_ENABLE | CTL_ACAP_EN);
+	snd_bt87x_writel(chip, REG_GPIO_DMA_CTL, chip->reg_control);
+	snd_bt87x_writel(chip, REG_INT_MASK, 0);
+	snd_bt87x_writel(chip, REG_INT_STAT, MY_INTERRUPTS);
+	spin_unlock(&chip->reg_lock);
+	return 0;
+}
+
+static int snd_bt87x_trigger(snd_pcm_substream_t *substream, int cmd)
+{
+	bt87x_t *chip = snd_pcm_substream_chip(substream);
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+		return snd_bt87x_start(chip);
+	case SNDRV_PCM_TRIGGER_STOP:
+		return snd_bt87x_stop(chip);
+	default:
+		return -EINVAL;
+	}
+}
+
+static snd_pcm_uframes_t snd_bt87x_pointer(snd_pcm_substream_t *substream)
+{
+	bt87x_t *chip = snd_pcm_substream_chip(substream);
+	snd_pcm_runtime_t *runtime = substream->runtime;
+
+	return (snd_pcm_uframes_t)bytes_to_frames(runtime, chip->current_line * chip->line_bytes);
+}
+
+static snd_pcm_ops_t snd_bt87x_pcm_ops = {
+	.open = snd_bt87x_pcm_open,
+	.close = snd_bt87x_close,
+	.ioctl = snd_pcm_lib_ioctl,
+	.hw_params = snd_bt87x_hw_params,
+	.hw_free = snd_bt87x_hw_free,
+	.prepare = snd_bt87x_prepare,
+	.trigger = snd_bt87x_trigger,
+	.pointer = snd_bt87x_pointer,
+	.page = snd_pcm_sgbuf_ops_page,
+};
+
+static int snd_bt87x_capture_volume_info(snd_kcontrol_t *kcontrol, snd_ctl_elem_info_t *info)
+{
+	info->type = SNDRV_CTL_ELEM_TYPE_INTEGER;
+	info->count = 1;
+	info->value.integer.min = 0;
+	info->value.integer.max = 15;
+	return 0;
+}
+
+static int snd_bt87x_capture_volume_get(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *value)
+{
+	bt87x_t *chip = snd_kcontrol_chip(kcontrol);
+
+	value->value.integer.value[0] = (chip->reg_control & CTL_A_GAIN_MASK) >> CTL_A_GAIN_SHIFT;
+	return 0;
+}
+
+static int snd_bt87x_capture_volume_put(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *value)
+{
+	bt87x_t *chip = snd_kcontrol_chip(kcontrol);
+	u32 old_control;
+	int changed;
+
+	spin_lock_irq(&chip->reg_lock);
+	old_control = chip->reg_control;
+	chip->reg_control = (chip->reg_control & ~CTL_A_GAIN_MASK)
+		| (value->value.integer.value[0] << CTL_A_GAIN_SHIFT);
+	snd_bt87x_writel(chip, REG_GPIO_DMA_CTL, chip->reg_control);
+	changed = old_control != chip->reg_control;
+	spin_unlock_irq(&chip->reg_lock);
+	return changed;
+}
+
+static snd_kcontrol_new_t snd_bt87x_capture_volume = {
+	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+	.name = "Capture Volume",
+	.info = snd_bt87x_capture_volume_info,
+	.get = snd_bt87x_capture_volume_get,
+	.put = snd_bt87x_capture_volume_put,
+};
+
+static int snd_bt87x_capture_boost_info(snd_kcontrol_t *kcontrol, snd_ctl_elem_info_t *info)
+{
+	info->type = SNDRV_CTL_ELEM_TYPE_BOOLEAN;
+	info->count = 1;
+	info->value.integer.min = 0;
+	info->value.integer.max = 1;
+	return 0;
+}
+
+static int snd_bt87x_capture_boost_get(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *value)
+{
+	bt87x_t *chip = snd_kcontrol_chip(kcontrol);
+
+	value->value.integer.value[0] = !! (chip->reg_control & CTL_A_G2X);
+	return 0;
+}
+
+static int snd_bt87x_capture_boost_put(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *value)
+{
+	bt87x_t *chip = snd_kcontrol_chip(kcontrol);
+	u32 old_control;
+	int changed;
+
+	spin_lock_irq(&chip->reg_lock);
+	old_control = chip->reg_control;
+	chip->reg_control = (chip->reg_control & ~CTL_A_G2X)
+		| (value->value.integer.value[0] ? CTL_A_G2X : 0);
+	snd_bt87x_writel(chip, REG_GPIO_DMA_CTL, chip->reg_control);
+	changed = chip->reg_control != old_control;
+	spin_unlock_irq(&chip->reg_lock);
+	return changed;
+}
+
+static snd_kcontrol_new_t snd_bt87x_capture_boost = {
+	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+	.name = "Capture Boost",
+	.info = snd_bt87x_capture_boost_info,
+	.get = snd_bt87x_capture_boost_get,
+	.put = snd_bt87x_capture_boost_put,
+};
+
+static int snd_bt87x_capture_source_info(snd_kcontrol_t *kcontrol, snd_ctl_elem_info_t *info)
+{
+	static char *texts[3] = {"TV Tuner", "FM", "Mic/Line"};
+
+	info->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
+	info->count = 1;
+	info->value.enumerated.items = 3;
+	if (info->value.enumerated.item > 2)
+		info->value.enumerated.item = 2;
+	strcpy(info->value.enumerated.name, texts[info->value.enumerated.item]);
+	return 0;
+}
+
+static int snd_bt87x_capture_source_get(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *value)
+{
+	bt87x_t *chip = snd_kcontrol_chip(kcontrol);
+
+	value->value.enumerated.item[0] = (chip->reg_control & CTL_A_SEL_MASK) >> CTL_A_SEL_SHIFT;
+	return 0;
+}
+
+static int snd_bt87x_capture_source_put(snd_kcontrol_t *kcontrol, snd_ctl_elem_value_t *value)
+{
+	bt87x_t *chip = snd_kcontrol_chip(kcontrol);
+	u32 old_control;
+	int changed;
+
+	spin_lock_irq(&chip->reg_lock);
+	old_control = chip->reg_control;
+	chip->reg_control = (chip->reg_control & ~CTL_A_SEL_MASK)
+		| (value->value.enumerated.item[0] << CTL_A_SEL_SHIFT);
+	snd_bt87x_writel(chip, REG_GPIO_DMA_CTL, chip->reg_control);
+	changed = chip->reg_control != old_control;
+	spin_unlock_irq(&chip->reg_lock);
+	return changed;
+}
+
+static snd_kcontrol_new_t snd_bt87x_capture_source = {
+	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
+	.name = "Capture Source",
+	.info = snd_bt87x_capture_source_info,
+	.get = snd_bt87x_capture_source_get,
+	.put = snd_bt87x_capture_source_put,
+};
+
+static int snd_bt87x_free(bt87x_t *chip)
+{
+	if (chip->mmio) {
+		snd_bt87x_stop(chip);
+		if (chip->irq >= 0)
+			synchronize_irq(chip->irq);
+
+		iounmap(chip->mmio);
+	}
+	if (chip->irq >= 0)
+		free_irq(chip->irq, chip);
+	pci_release_regions(chip->pci);
+	pci_disable_device(chip->pci);
+	kfree(chip);
+	return 0;
+}
+
+static int snd_bt87x_dev_free(snd_device_t *device)
+{
+	bt87x_t *chip = device->device_data;
+	return snd_bt87x_free(chip);
+}
+
+static int __devinit snd_bt87x_pcm(bt87x_t *chip, int device, char *name)
+{
+	int err;
+	snd_pcm_t *pcm;
+
+	err = snd_pcm_new(chip->card, name, device, 0, 1, &pcm);
+	if (err < 0)
+		return err;
+	pcm->private_data = chip;
+	strcpy(pcm->name, name);
+	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_CAPTURE, &snd_bt87x_pcm_ops);
+	return snd_pcm_lib_preallocate_pages_for_all(pcm,
+						     SNDRV_DMA_TYPE_DEV_SG,
+						     snd_dma_pci_data(chip->pci),
+							128 * 1024,
+							(255 * 4092 + 1023) & ~1023);
+}
+
+static int __devinit snd_bt87x_create(snd_card_t *card,
+				      struct pci_dev *pci,
+				      bt87x_t **rchip)
+{
+	bt87x_t *chip;
+	int err;
+	static snd_device_ops_t ops = {
+		.dev_free = snd_bt87x_dev_free
+	};
+
+	*rchip = NULL;
+
+	err = pci_enable_device(pci);
+	if (err < 0)
+		return err;
+
+	chip = kcalloc(1, sizeof(*chip), GFP_KERNEL);
+	if (!chip) {
+		pci_disable_device(pci);
+		return -ENOMEM;
+	}
+	chip->card = card;
+	chip->pci = pci;
+	chip->irq = -1;
+	spin_lock_init(&chip->reg_lock);
+
+	if ((err = pci_request_regions(pci, "Bt87x audio")) < 0) {
+		kfree(chip);
+		pci_disable_device(pci);
+		return err;
+	}
+	chip->mmio = ioremap_nocache(pci_resource_start(pci, 0),
+				     pci_resource_len(pci, 0));
+	if (!chip->mmio) {
+		snd_bt87x_free(chip);
+		snd_printk(KERN_ERR "cannot remap io memory\n");
+		return -ENOMEM;
+	}
+
+	chip->reg_control = CTL_DA_ES2 | CTL_PKTP_16 | (15 << CTL_DA_SDR_SHIFT);
+	chip->interrupt_mask = MY_INTERRUPTS;
+	snd_bt87x_writel(chip, REG_GPIO_DMA_CTL, chip->reg_control);
+	snd_bt87x_writel(chip, REG_INT_MASK, 0);
+	snd_bt87x_writel(chip, REG_INT_STAT, MY_INTERRUPTS);
+
+	if (request_irq(pci->irq, snd_bt87x_interrupt, SA_INTERRUPT | SA_SHIRQ,
+			"Bt87x audio", chip)) {
+		snd_bt87x_free(chip);
+		snd_printk(KERN_ERR "cannot grab irq\n");
+		return -EBUSY;
+	}
+	chip->irq = pci->irq;
+	pci_set_master(pci);
+	synchronize_irq(chip->irq);
+
+	err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
+	if (err < 0) {
+		snd_bt87x_free(chip);
+		return err;
+	}
+	snd_card_set_dev(card, &pci->dev);
+	*rchip = chip;
+	return 0;
+}
+
+#define BT_DEVICE(chip, subvend, subdev, rate) \
+	{ .vendor = PCI_VENDOR_ID_BROOKTREE, \
+	  .device = PCI_DEVICE_ID_BROOKTREE_##chip, \
+	  .subvendor = subvend, .subdevice = subdev, \
+	  .driver_data = rate }
+
+/* driver_data is the default digital_rate value for that device */
+static struct pci_device_id snd_bt87x_ids[] = {
+	BT_DEVICE(878, 0x0070, 0x13eb, 32000), /* Hauppauge WinTV series */
+	BT_DEVICE(879, 0x0070, 0x13eb, 32000), /* Hauppauge WinTV series */
+	BT_DEVICE(878, 0x0070, 0xff01, 44100), /* Viewcast Osprey 200 */
+	{ }
+};
+MODULE_DEVICE_TABLE(pci, snd_bt87x_ids);
+
+/* cards known not to have audio
+ * (DVB cards use the audio function to transfer MPEG data) */
+static struct {
+	unsigned short subvendor, subdevice;
+} blacklist[] __devinitdata = {
+	{0x0071, 0x0101}, /* Nebula Electronics DigiTV */
+	{0x11bd, 0x0026}, /* Pinnacle PCTV SAT CI */
+	{0x1461, 0x0761}, /* AVermedia AverTV DVB-T */
+	{0x1461, 0x0771}, /* AVermedia DVB-T 771 */
+	{0x1822, 0x0001}, /* Twinhan VisionPlus DVB-T */
+	{0x18ac, 0xdb10}, /* DVICO FusionHDTV DVB-T Lite */
+	{0x270f, 0xfc00}, /* Chaintech Digitop DST-1000 DVB-S */
+};
+
+/* return the rate of the card, or a negative value if it's blacklisted */
+static int __devinit snd_bt87x_detect_card(struct pci_dev *pci)
+{
+	int i;
+	const struct pci_device_id *supported;
+
+	supported = pci_match_device(snd_bt87x_ids, pci);
+	if (supported)
+		return supported->driver_data;
+
+	for (i = 0; i < ARRAY_SIZE(blacklist); ++i)
+		if (blacklist[i].subvendor == pci->subsystem_vendor &&
+		    blacklist[i].subdevice == pci->subsystem_device) {
+			snd_printdd(KERN_INFO "card %#04x:%#04x has no audio\n",
+				    pci->subsystem_vendor, pci->subsystem_device);
+			return -EBUSY;
+		}
+
+	snd_printk(KERN_INFO "unknown card %#04x:%#04x, using default rate 32000\n",
+		   pci->subsystem_vendor, pci->subsystem_device);
+	snd_printk(KERN_DEBUG "please mail id, board name, and, "
+		   "if it works, the correct digital_rate option to "
+		   "<alsa-devel@lists.sf.net>\n");
+	return 32000; /* default rate */
+}
+
+static int __devinit snd_bt87x_probe(struct pci_dev *pci,
+				     const struct pci_device_id *pci_id)
+{
+	static int dev;
+	snd_card_t *card;
+	bt87x_t *chip;
+	int err, rate;
+
+	rate = pci_id->driver_data;
+	if (! rate)
+		if ((rate = snd_bt87x_detect_card(pci)) <= 0)
+			return -ENODEV;
+
+	if (dev >= SNDRV_CARDS)
+		return -ENODEV;
+	if (!enable[dev]) {
+		++dev;
+		return -ENOENT;
+	}
+
+	card = snd_card_new(index[dev], id[dev], THIS_MODULE, 0);
+	if (!card)
+		return -ENOMEM;
+
+	err = snd_bt87x_create(card, pci, &chip);
+	if (err < 0)
+		goto _error;
+
+	if (digital_rate[dev] > 0)
+		chip->dig_rate = digital_rate[dev];
+	else
+		chip->dig_rate = rate;
+
+	err = snd_bt87x_pcm(chip, DEVICE_DIGITAL, "Bt87x Digital");
+	if (err < 0)
+		goto _error;
+	err = snd_bt87x_pcm(chip, DEVICE_ANALOG, "Bt87x Analog");
+	if (err < 0)
+		goto _error;
+
+	err = snd_ctl_add(card, snd_ctl_new1(&snd_bt87x_capture_volume, chip));
+	if (err < 0)
+		goto _error;
+	err = snd_ctl_add(card, snd_ctl_new1(&snd_bt87x_capture_boost, chip));
+	if (err < 0)
+		goto _error;
+	err = snd_ctl_add(card, snd_ctl_new1(&snd_bt87x_capture_source, chip));
+	if (err < 0)
+		goto _error;
+
+	strcpy(card->driver, "Bt87x");
+	sprintf(card->shortname, "Brooktree Bt%x", pci->device);
+	sprintf(card->longname, "%s at %#lx, irq %i",
+		card->shortname, pci_resource_start(pci, 0), chip->irq);
+	strcpy(card->mixername, "Bt87x");
+
+	err = snd_card_register(card);
+	if (err < 0)
+		goto _error;
+
+	pci_set_drvdata(pci, card);
+	++dev;
+	return 0;
+
+_error:
+	snd_card_free(card);
+	return err;
+}
+
+static void __devexit snd_bt87x_remove(struct pci_dev *pci)
+{
+	snd_card_free(pci_get_drvdata(pci));
+	pci_set_drvdata(pci, NULL);
+}
+
+/* default entries for all Bt87x cards - it's not exported */
+/* driver_data is set to 0 to call detection */
+static struct pci_device_id snd_bt87x_default_ids[] = {
+	BT_DEVICE(878, PCI_ANY_ID, PCI_ANY_ID, 0),
+	BT_DEVICE(879, PCI_ANY_ID, PCI_ANY_ID, 0),
+	{ }
+};
+
+static struct pci_driver driver = {
+	.name = "Bt87x",
+	.id_table = snd_bt87x_ids,
+	.probe = snd_bt87x_probe,
+	.remove = __devexit_p(snd_bt87x_remove),
+};
+
+static int __init alsa_card_bt87x_init(void)
+{
+	if (load_all)
+		driver.id_table = snd_bt87x_default_ids;
+	return pci_module_init(&driver);
+}
+
+static void __exit alsa_card_bt87x_exit(void)
+{
+	pci_unregister_driver(&driver);
+}
+
+module_init(alsa_card_bt87x_init)
+module_exit(alsa_card_bt87x_exit)