/*
 * 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 <linux/init.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/module.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 bool enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;     /* Enable this card */
static int digital_rate[SNDRV_CARDS];   /* digital input rate */
static bool 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");


/* 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)

/* Cards with configuration information */
enum snd_bt87x_boardid {
        SND_BT87X_BOARD_UNKNOWN,
        SND_BT87X_BOARD_GENERIC,        /* both an & dig interfaces, 32kHz */
        SND_BT87X_BOARD_ANALOG,         /* board with no external A/D */
        SND_BT87X_BOARD_OSPREY2x0,
        SND_BT87X_BOARD_OSPREY440,
        SND_BT87X_BOARD_AVPHONE98,
};

/* Card configuration */
struct snd_bt87x_board {
        int dig_rate;           /* Digital input sampling rate */
        u32 digital_fmt;        /* Register settings for digital input */
        unsigned no_analog:1;   /* No analog input */
        unsigned no_digital:1;  /* No digital input */
};

static __devinitdata struct snd_bt87x_board snd_bt87x_boards[] = {
        [SND_BT87X_BOARD_UNKNOWN] = {
                .dig_rate = 32000, /* just a guess */
        },
        [SND_BT87X_BOARD_GENERIC] = {
                .dig_rate = 32000,
        },
        [SND_BT87X_BOARD_ANALOG] = {
                .no_digital = 1,
        },
        [SND_BT87X_BOARD_OSPREY2x0] = {
                .dig_rate = 44100,
                .digital_fmt = CTL_DA_LRI | (1 << CTL_DA_LRD_SHIFT),
        },
        [SND_BT87X_BOARD_OSPREY440] = {
                .dig_rate = 32000,
                .digital_fmt = CTL_DA_LRI | (1 << CTL_DA_LRD_SHIFT),
                .no_analog = 1,
        },
        [SND_BT87X_BOARD_AVPHONE98] = {
                .dig_rate = 48000,
        },
};

struct snd_bt87x {
        struct snd_card *card;
        struct pci_dev *pci;
        struct snd_bt87x_board board;

        void __iomem *mmio;
        int irq;

        spinlock_t reg_lock;
        unsigned long opened;
        struct snd_pcm_substream *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(struct snd_bt87x *chip, u32 reg)
{
        return readl(chip->mmio + reg);
}

static inline void snd_bt87x_writel(struct snd_bt87x *chip, u32 reg, u32 value)
{
        writel(value, chip->mmio + reg);
}

static int snd_bt87x_create_risc(struct snd_bt87x *chip, struct snd_pcm_substream *substream,
                                 unsigned int periods, unsigned int period_bytes)
{
        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;
                        unsigned int addr;

                        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);
                        addr = snd_pcm_sgbuf_get_addr(substream, offset);
                        *risc++ = cpu_to_le32(addr);
                        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(struct snd_bt87x *chip)
{
        if (chip->dma_risc.area) {
                snd_dma_free_pages(&chip->dma_risc);
                chip->dma_risc.area = NULL;
        }
}

static void snd_bt87x_pci_error(struct snd_bt87x *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 snd_bt87x *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 struct snd_pcm_hardware snd_bt87x_digital_hw = {
        .info = SNDRV_PCM_INFO_MMAP |
                SNDRV_PCM_INFO_INTERLEAVED |
                SNDRV_PCM_INFO_BLOCK_TRANSFER |
                SNDRV_PCM_INFO_MMAP_VALID |
                SNDRV_PCM_INFO_BATCH,
        .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 struct snd_pcm_hardware snd_bt87x_analog_hw = {
        .info = SNDRV_PCM_INFO_MMAP |
                SNDRV_PCM_INFO_INTERLEAVED |
                SNDRV_PCM_INFO_BLOCK_TRANSFER |
                SNDRV_PCM_INFO_MMAP_VALID |
                SNDRV_PCM_INFO_BATCH,
        .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(struct snd_bt87x *chip, struct snd_pcm_runtime *runtime)
{
        chip->reg_control |= CTL_DA_IOM_DA | CTL_A_PWRDN;
        runtime->hw = snd_bt87x_digital_hw;
        runtime->hw.rates = snd_pcm_rate_to_rate_bit(chip->board.dig_rate);
        runtime->hw.rate_min = chip->board.dig_rate;
        runtime->hw.rate_max = chip->board.dig_rate;
        return 0;
}

static int snd_bt87x_set_analog_hw(struct snd_bt87x *chip, struct snd_pcm_runtime *runtime)
{
        static struct snd_ratnum analog_clock = {
                .num = ANALOG_CLOCK,
                .den_min = CLOCK_DIV_MIN,
                .den_max = CLOCK_DIV_MAX,
                .den_step = 1
        };
        static struct snd_pcm_hw_constraint_ratnums constraint_rates = {
                .nrats = 1,
                .rats = &analog_clock
        };

        chip->reg_control &= ~(CTL_DA_IOM_DA | CTL_A_PWRDN);
        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(struct snd_pcm_substream *substream)
{
        struct snd_bt87x *chip = snd_pcm_substream_chip(substream);
        struct snd_pcm_runtime *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(struct snd_pcm_substream *substream)
{
        struct snd_bt87x *chip = snd_pcm_substream_chip(substream);

        spin_lock_irq(&chip->reg_lock);
        chip->reg_control |= CTL_A_PWRDN;
        snd_bt87x_writel(chip, REG_GPIO_DMA_CTL, chip->reg_control);
        spin_unlock_irq(&chip->reg_lock);

        chip->substream = NULL;
        clear_bit(0, &chip->opened);
        smp_mb__after_clear_bit();
        return 0;
}

static int snd_bt87x_hw_params(struct snd_pcm_substream *substream,
                               struct snd_pcm_hw_params *hw_params)
{
        struct snd_bt87x *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(struct snd_pcm_substream *substream)
{
        struct snd_bt87x *chip = snd_pcm_substream_chip(substream);

        snd_bt87x_free_risc(chip);
        snd_pcm_lib_free_pages(substream);
        return 0;
}

static int snd_bt87x_prepare(struct snd_pcm_substream *substream)
{
        struct snd_bt87x *chip = snd_pcm_substream_chip(substream);
        struct snd_pcm_runtime *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(struct snd_bt87x *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(struct snd_bt87x *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(struct snd_pcm_substream *substream, int cmd)
{
        struct snd_bt87x *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(struct snd_pcm_substream *substream)
{
        struct snd_bt87x *chip = snd_pcm_substream_chip(substream);
        struct snd_pcm_runtime *runtime = substream->runtime;

        return (snd_pcm_uframes_t)bytes_to_frames(runtime, chip->current_line * chip->line_bytes);
}

static struct snd_pcm_ops 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(struct snd_kcontrol *kcontrol,
                                         struct snd_ctl_elem_info *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(struct snd_kcontrol *kcontrol,
                                        struct snd_ctl_elem_value *value)
{
        struct snd_bt87x *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(struct snd_kcontrol *kcontrol,
                                        struct snd_ctl_elem_value *value)
{
        struct snd_bt87x *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 struct snd_kcontrol_new 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,
};

#define snd_bt87x_capture_boost_info    snd_ctl_boolean_mono_info

static int snd_bt87x_capture_boost_get(struct snd_kcontrol *kcontrol,
                                       struct snd_ctl_elem_value *value)
{
        struct snd_bt87x *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(struct snd_kcontrol *kcontrol,
                                       struct snd_ctl_elem_value *value)
{
        struct snd_bt87x *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 struct snd_kcontrol_new 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(struct snd_kcontrol *kcontrol,
                                         struct snd_ctl_elem_info *info)
{
        static const char *const texts[3] = {"TV Tuner", "FM", "Mic/Line"};

        return snd_ctl_enum_info(info, 1, 3, texts);
}

static int snd_bt87x_capture_source_get(struct snd_kcontrol *kcontrol,
                                        struct snd_ctl_elem_value *value)
{
        struct snd_bt87x *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(struct snd_kcontrol *kcontrol,
                                        struct snd_ctl_elem_value *value)
{
        struct snd_bt87x *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 struct snd_kcontrol_new 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(struct snd_bt87x *chip)
{
        if (chip->mmio)
                snd_bt87x_stop(chip);
        if (chip->irq >= 0)
                free_irq(chip->irq, chip);
        if (chip->mmio)
                iounmap(chip->mmio);
        pci_release_regions(chip->pci);
        pci_disable_device(chip->pci);
        kfree(chip);
        return 0;
}

static int snd_bt87x_dev_free(struct snd_device *device)
{
        struct snd_bt87x *chip = device->device_data;
        return snd_bt87x_free(chip);
}

static int __devinit snd_bt87x_pcm(struct snd_bt87x *chip, int device, char *name)
{
        int err;
        struct snd_pcm *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,
                                                        ALIGN(255 * 4092, 1024));
}

static int __devinit snd_bt87x_create(struct snd_card *card,
                                      struct pci_dev *pci,
                                      struct snd_bt87x **rchip)
{
        struct snd_bt87x *chip;
        int err;
        static struct snd_device_ops ops = {
                .dev_free = snd_bt87x_dev_free
        };

        *rchip = NULL;

        err = pci_enable_device(pci);
        if (err < 0)
                return err;

        chip = kzalloc(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 = pci_ioremap_bar(pci, 0);
        if (!chip->mmio) {
                snd_printk(KERN_ERR "cannot remap io memory\n");
                err = -ENOMEM;
                goto fail;
        }

        chip->reg_control = CTL_A_PWRDN | 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);

        err = request_irq(pci->irq, snd_bt87x_interrupt, IRQF_SHARED,
                          KBUILD_MODNAME, chip);
        if (err < 0) {
                snd_printk(KERN_ERR "cannot grab irq %d\n", pci->irq);
                goto fail;
        }
        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)
                goto fail;

        snd_card_set_dev(card, &pci->dev);
        *rchip = chip;
        return 0;

fail:
        snd_bt87x_free(chip);
        return err;
}

#define BT_DEVICE(chip, subvend, subdev, id) \
        { .vendor = PCI_VENDOR_ID_BROOKTREE, \
          .device = chip, \
          .subvendor = subvend, .subdevice = subdev, \
          .driver_data = SND_BT87X_BOARD_ ## id }
/* driver_data is the card id for that device */

static DEFINE_PCI_DEVICE_TABLE(snd_bt87x_ids) = {
        /* Hauppauge WinTV series */
        BT_DEVICE(PCI_DEVICE_ID_BROOKTREE_878, 0x0070, 0x13eb, GENERIC),
        /* Hauppauge WinTV series */
        BT_DEVICE(PCI_DEVICE_ID_BROOKTREE_879, 0x0070, 0x13eb, GENERIC),
        /* Viewcast Osprey 200 */
        BT_DEVICE(PCI_DEVICE_ID_BROOKTREE_878, 0x0070, 0xff01, OSPREY2x0),
        /* Viewcast Osprey 440 (rate is configurable via gpio) */
        BT_DEVICE(PCI_DEVICE_ID_BROOKTREE_878, 0x0070, 0xff07, OSPREY440),
        /* ATI TV-Wonder */
        BT_DEVICE(PCI_DEVICE_ID_BROOKTREE_878, 0x1002, 0x0001, GENERIC),
        /* Leadtek Winfast tv 2000xp delux */
        BT_DEVICE(PCI_DEVICE_ID_BROOKTREE_878, 0x107d, 0x6606, GENERIC),
        /* Pinnacle PCTV */
        BT_DEVICE(PCI_DEVICE_ID_BROOKTREE_878, 0x11bd, 0x0012, GENERIC),
        /* Voodoo TV 200 */
        BT_DEVICE(PCI_DEVICE_ID_BROOKTREE_878, 0x121a, 0x3000, GENERIC),
        /* Askey Computer Corp. MagicTView'99 */
        BT_DEVICE(PCI_DEVICE_ID_BROOKTREE_878, 0x144f, 0x3000, GENERIC),
        /* AVerMedia Studio No. 103, 203, ...? */
        BT_DEVICE(PCI_DEVICE_ID_BROOKTREE_878, 0x1461, 0x0003, AVPHONE98),
        /* Prolink PixelView PV-M4900 */
        BT_DEVICE(PCI_DEVICE_ID_BROOKTREE_878, 0x1554, 0x4011, GENERIC),
        /* Pinnacle  Studio PCTV rave */
        BT_DEVICE(PCI_DEVICE_ID_BROOKTREE_878, 0xbd11, 0x1200, GENERIC),
        { }
};
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, 0x001c}, /* Pinnacle PCTV Sat */
        {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, 0xd500}, /* DVICO FusionHDTV 5 Lite */
        {0x18ac, 0xdb10}, /* DVICO FusionHDTV DVB-T Lite */
        {0x18ac, 0xdb11}, /* Ultraview DVB-T Lite */
        {0x270f, 0xfc00}, /* Chaintech Digitop DST-1000 DVB-S */
        {0x7063, 0x2000}, /* pcHDTV HD-2000 TV */
};

/* return the id 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_id(snd_bt87x_ids, pci);
        if (supported && supported->driver_data > 0)
                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:%#04x has no audio\n",
                                    pci->device, pci->subsystem_vendor, pci->subsystem_device);
                        return -EBUSY;
                }

        snd_printk(KERN_INFO "unknown card %#04x-%#04x:%#04x\n",
                   pci->device, 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@alsa-project.org>\n");
        return SND_BT87X_BOARD_UNKNOWN;
}

static int __devinit snd_bt87x_probe(struct pci_dev *pci,
                                     const struct pci_device_id *pci_id)
{
        static int dev;
        struct snd_card *card;
        struct snd_bt87x *chip;
        int err;
        enum snd_bt87x_boardid boardid;

        if (!pci_id->driver_data) {
                err = snd_bt87x_detect_card(pci);
                if (err < 0)
                        return -ENODEV;
                boardid = err;
        } else
                boardid = pci_id->driver_data;

        if (dev >= SNDRV_CARDS)
                return -ENODEV;
        if (!enable[dev]) {
                ++dev;
                return -ENOENT;
        }

        err = snd_card_create(index[dev], id[dev], THIS_MODULE, 0, &card);
        if (err < 0)
                return err;

        err = snd_bt87x_create(card, pci, &chip);
        if (err < 0)
                goto _error;

        memcpy(&chip->board, &snd_bt87x_boards[boardid], sizeof(chip->board));

        if (!chip->board.no_digital) {
                if (digital_rate[dev] > 0)
                        chip->board.dig_rate = digital_rate[dev];

                chip->reg_control |= chip->board.digital_fmt;

                err = snd_bt87x_pcm(chip, DEVICE_DIGITAL, "Bt87x Digital");
                if (err < 0)
                        goto _error;
        }
        if (!chip->board.no_analog) {
                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;
        }
        snd_printk(KERN_INFO "bt87x%d: Using board %d, %sanalog, %sdigital "
                   "(rate %d Hz)\n", dev, boardid,
                   chip->board.no_analog ? "no " : "",
                   chip->board.no_digital ? "no " : "", chip->board.dig_rate);

        strcpy(card->driver, "Bt87x");
        sprintf(card->shortname, "Brooktree Bt%x", pci->device);
        sprintf(card->longname, "%s at %#llx, irq %i",
                card->shortname, (unsigned long long)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 DEFINE_PCI_DEVICE_TABLE(snd_bt87x_default_ids) = {
        BT_DEVICE(PCI_DEVICE_ID_BROOKTREE_878, PCI_ANY_ID, PCI_ANY_ID, UNKNOWN),
        BT_DEVICE(PCI_DEVICE_ID_BROOKTREE_879, PCI_ANY_ID, PCI_ANY_ID, UNKNOWN),
        { }
};

static struct pci_driver bt87x_driver = {
        .name = KBUILD_MODNAME,
        .id_table = snd_bt87x_ids,
        .probe = snd_bt87x_probe,
        .remove = __devexit_p(snd_bt87x_remove),
};

module_pci_driver(bt87x_driver);