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oxygen_lib.c

/*
 * C-Media CMI8788 driver - main driver module
 *
 * Copyright (c) Clemens Ladisch <clemens@ladisch.de>
 *
 *
 *  This driver is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License, version 2.
 *
 *  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 driver; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 */

#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/mutex.h>
#include <linux/pci.h>
#include <sound/ac97_codec.h>
#include <sound/asoundef.h>
#include <sound/core.h>
#include <sound/info.h>
#include <sound/mpu401.h>
#include <sound/pcm.h>
#include "oxygen.h"
#include "cm9780.h"

MODULE_AUTHOR("Clemens Ladisch <clemens@ladisch.de>");
MODULE_DESCRIPTION("C-Media CMI8788 helper library");
MODULE_LICENSE("GPL v2");


static irqreturn_t oxygen_interrupt(int dummy, void *dev_id)
{
      struct oxygen *chip = dev_id;
      unsigned int status, clear, elapsed_streams, i;

      status = oxygen_read16(chip, OXYGEN_INTERRUPT_STATUS);
      if (!status)
            return IRQ_NONE;

      spin_lock(&chip->reg_lock);

      clear = status & (OXYGEN_CHANNEL_A |
                    OXYGEN_CHANNEL_B |
                    OXYGEN_CHANNEL_C |
                    OXYGEN_CHANNEL_SPDIF |
                    OXYGEN_CHANNEL_MULTICH |
                    OXYGEN_CHANNEL_AC97 |
                    OXYGEN_INT_SPDIF_IN_DETECT |
                    OXYGEN_INT_GPIO |
                    OXYGEN_INT_AC97);
      if (clear) {
            if (clear & OXYGEN_INT_SPDIF_IN_DETECT)
                  chip->interrupt_mask &= ~OXYGEN_INT_SPDIF_IN_DETECT;
            oxygen_write16(chip, OXYGEN_INTERRUPT_MASK,
                         chip->interrupt_mask & ~clear);
            oxygen_write16(chip, OXYGEN_INTERRUPT_MASK,
                         chip->interrupt_mask);
      }

      elapsed_streams = status & chip->pcm_running;

      spin_unlock(&chip->reg_lock);

      for (i = 0; i < PCM_COUNT; ++i)
            if ((elapsed_streams & (1 << i)) && chip->streams[i])
                  snd_pcm_period_elapsed(chip->streams[i]);

      if (status & OXYGEN_INT_SPDIF_IN_DETECT) {
            spin_lock(&chip->reg_lock);
            i = oxygen_read32(chip, OXYGEN_SPDIF_CONTROL);
            if (i & (OXYGEN_SPDIF_SENSE_INT | OXYGEN_SPDIF_LOCK_INT |
                   OXYGEN_SPDIF_RATE_INT)) {
                  /* write the interrupt bit(s) to clear */
                  oxygen_write32(chip, OXYGEN_SPDIF_CONTROL, i);
                  schedule_work(&chip->spdif_input_bits_work);
            }
            spin_unlock(&chip->reg_lock);
      }

      if (status & OXYGEN_INT_GPIO)
            schedule_work(&chip->gpio_work);

      if ((status & OXYGEN_INT_MIDI) && chip->midi)
            snd_mpu401_uart_interrupt(0, chip->midi->private_data);

      if (status & OXYGEN_INT_AC97)
            wake_up(&chip->ac97_waitqueue);

      return IRQ_HANDLED;
}

static void oxygen_spdif_input_bits_changed(struct work_struct *work)
{
      struct oxygen *chip = container_of(work, struct oxygen,
                                 spdif_input_bits_work);
      u32 reg;

      /*
       * This function gets called when there is new activity on the SPDIF
       * input, or when we lose lock on the input signal, or when the rate
       * changes.
       */
      msleep(1);
      spin_lock_irq(&chip->reg_lock);
      reg = oxygen_read32(chip, OXYGEN_SPDIF_CONTROL);
      if ((reg & (OXYGEN_SPDIF_SENSE_STATUS |
                OXYGEN_SPDIF_LOCK_STATUS))
          == OXYGEN_SPDIF_SENSE_STATUS) {
            /*
             * If we detect activity on the SPDIF input but cannot lock to
             * a signal, the clock bit is likely to be wrong.
             */
            reg ^= OXYGEN_SPDIF_IN_CLOCK_MASK;
            oxygen_write32(chip, OXYGEN_SPDIF_CONTROL, reg);
            spin_unlock_irq(&chip->reg_lock);
            msleep(1);
            spin_lock_irq(&chip->reg_lock);
            reg = oxygen_read32(chip, OXYGEN_SPDIF_CONTROL);
            if ((reg & (OXYGEN_SPDIF_SENSE_STATUS |
                      OXYGEN_SPDIF_LOCK_STATUS))
                == OXYGEN_SPDIF_SENSE_STATUS) {
                  /* nothing detected with either clock; give up */
                  if ((reg & OXYGEN_SPDIF_IN_CLOCK_MASK)
                      == OXYGEN_SPDIF_IN_CLOCK_192) {
                        /*
                         * Reset clock to <= 96 kHz because this is
                         * more likely to be received next time.
                         */
                        reg &= ~OXYGEN_SPDIF_IN_CLOCK_MASK;
                        reg |= OXYGEN_SPDIF_IN_CLOCK_96;
                        oxygen_write32(chip, OXYGEN_SPDIF_CONTROL, reg);
                  }
            }
      }
      spin_unlock_irq(&chip->reg_lock);

      if (chip->controls[CONTROL_SPDIF_INPUT_BITS]) {
            spin_lock_irq(&chip->reg_lock);
            chip->interrupt_mask |= OXYGEN_INT_SPDIF_IN_DETECT;
            oxygen_write16(chip, OXYGEN_INTERRUPT_MASK,
                         chip->interrupt_mask);
            spin_unlock_irq(&chip->reg_lock);

            /*
             * We don't actually know that any channel status bits have
             * changed, but let's send a notification just to be sure.
             */
            snd_ctl_notify(chip->card, SNDRV_CTL_EVENT_MASK_VALUE,
                         &chip->controls[CONTROL_SPDIF_INPUT_BITS]->id);
      }
}

static void oxygen_gpio_changed(struct work_struct *work)
{
      struct oxygen *chip = container_of(work, struct oxygen, gpio_work);

      if (chip->model->gpio_changed)
            chip->model->gpio_changed(chip);
}

#ifdef CONFIG_PROC_FS
static void oxygen_proc_read(struct snd_info_entry *entry,
                       struct snd_info_buffer *buffer)
{
      struct oxygen *chip = entry->private_data;
      int i, j;

      snd_iprintf(buffer, "CMI8788\n\n");
      for (i = 0; i < OXYGEN_IO_SIZE; i += 0x10) {
            snd_iprintf(buffer, "%02x:", i);
            for (j = 0; j < 0x10; ++j)
                  snd_iprintf(buffer, " %02x", oxygen_read8(chip, i + j));
            snd_iprintf(buffer, "\n");
      }
      if (mutex_lock_interruptible(&chip->mutex) < 0)
            return;
      if (chip->has_ac97_0) {
            snd_iprintf(buffer, "\nAC97\n");
            for (i = 0; i < 0x80; i += 0x10) {
                  snd_iprintf(buffer, "%02x:", i);
                  for (j = 0; j < 0x10; j += 2)
                        snd_iprintf(buffer, " %04x",
                                  oxygen_read_ac97(chip, 0, i + j));
                  snd_iprintf(buffer, "\n");
            }
      }
      if (chip->has_ac97_1) {
            snd_iprintf(buffer, "\nAC97 2\n");
            for (i = 0; i < 0x80; i += 0x10) {
                  snd_iprintf(buffer, "%02x:", i);
                  for (j = 0; j < 0x10; j += 2)
                        snd_iprintf(buffer, " %04x",
                                  oxygen_read_ac97(chip, 1, i + j));
                  snd_iprintf(buffer, "\n");
            }
      }
      mutex_unlock(&chip->mutex);
}

static void oxygen_proc_init(struct oxygen *chip)
{
      struct snd_info_entry *entry;

      if (!snd_card_proc_new(chip->card, "cmi8788", &entry))
            snd_info_set_text_ops(entry, chip, oxygen_proc_read);
}
#else
#define oxygen_proc_init(chip)
#endif

static void oxygen_init(struct oxygen *chip)
{
      unsigned int i;

      chip->dac_routing = 1;
      for (i = 0; i < 8; ++i)
            chip->dac_volume[i] = chip->model->dac_volume_min;
      chip->dac_mute = 1;
      chip->spdif_playback_enable = 1;
      chip->spdif_bits = OXYGEN_SPDIF_C | OXYGEN_SPDIF_ORIGINAL |
            (IEC958_AES1_CON_PCM_CODER << OXYGEN_SPDIF_CATEGORY_SHIFT);
      chip->spdif_pcm_bits = chip->spdif_bits;

      if (oxygen_read8(chip, OXYGEN_REVISION) & OXYGEN_REVISION_2)
            chip->revision = 2;
      else
            chip->revision = 1;

      if (chip->revision == 1)
            oxygen_set_bits8(chip, OXYGEN_MISC,
                         OXYGEN_MISC_PCI_MEM_W_1_CLOCK);

      i = oxygen_read16(chip, OXYGEN_AC97_CONTROL);
      chip->has_ac97_0 = (i & OXYGEN_AC97_CODEC_0) != 0;
      chip->has_ac97_1 = (i & OXYGEN_AC97_CODEC_1) != 0;

      oxygen_write8_masked(chip, OXYGEN_FUNCTION,
                       OXYGEN_FUNCTION_RESET_CODEC |
                       chip->model->function_flags,
                       OXYGEN_FUNCTION_RESET_CODEC |
                       OXYGEN_FUNCTION_2WIRE_SPI_MASK |
                       OXYGEN_FUNCTION_ENABLE_SPI_4_5);
      oxygen_write8(chip, OXYGEN_DMA_STATUS, 0);
      oxygen_write8(chip, OXYGEN_DMA_PAUSE, 0);
      oxygen_write8(chip, OXYGEN_PLAY_CHANNELS,
                  OXYGEN_PLAY_CHANNELS_2 |
                  OXYGEN_DMA_A_BURST_8 |
                  OXYGEN_DMA_MULTICH_BURST_8);
      oxygen_write16(chip, OXYGEN_INTERRUPT_MASK, 0);
      oxygen_write8_masked(chip, OXYGEN_MISC,
                       chip->model->misc_flags,
                       OXYGEN_MISC_WRITE_PCI_SUBID |
                       OXYGEN_MISC_REC_C_FROM_SPDIF |
                       OXYGEN_MISC_REC_B_FROM_AC97 |
                       OXYGEN_MISC_REC_A_FROM_MULTICH |
                       OXYGEN_MISC_MIDI);
      oxygen_write8(chip, OXYGEN_REC_FORMAT,
                  (OXYGEN_FORMAT_16 << OXYGEN_REC_FORMAT_A_SHIFT) |
                  (OXYGEN_FORMAT_16 << OXYGEN_REC_FORMAT_B_SHIFT) |
                  (OXYGEN_FORMAT_16 << OXYGEN_REC_FORMAT_C_SHIFT));
      oxygen_write8(chip, OXYGEN_PLAY_FORMAT,
                  (OXYGEN_FORMAT_16 << OXYGEN_SPDIF_FORMAT_SHIFT) |
                  (OXYGEN_FORMAT_16 << OXYGEN_MULTICH_FORMAT_SHIFT));
      oxygen_write8(chip, OXYGEN_REC_CHANNELS, OXYGEN_REC_CHANNELS_2_2_2);
      oxygen_write16(chip, OXYGEN_I2S_MULTICH_FORMAT,
                   OXYGEN_RATE_48000 | chip->model->dac_i2s_format |
                   OXYGEN_I2S_MCLK_256 | OXYGEN_I2S_BITS_16 |
                   OXYGEN_I2S_MASTER | OXYGEN_I2S_BCLK_64);
      if (chip->model->pcm_dev_cfg & CAPTURE_0_FROM_I2S_1)
            oxygen_write16(chip, OXYGEN_I2S_A_FORMAT,
                         OXYGEN_RATE_48000 | chip->model->adc_i2s_format |
                         OXYGEN_I2S_MCLK_256 | OXYGEN_I2S_BITS_16 |
                         OXYGEN_I2S_MASTER | OXYGEN_I2S_BCLK_64);
      else
            oxygen_write16(chip, OXYGEN_I2S_A_FORMAT,
                         OXYGEN_I2S_MASTER | OXYGEN_I2S_MUTE_MCLK);
      if (chip->model->pcm_dev_cfg & (CAPTURE_0_FROM_I2S_2 |
                              CAPTURE_2_FROM_I2S_2))
            oxygen_write16(chip, OXYGEN_I2S_B_FORMAT,
                         OXYGEN_RATE_48000 | chip->model->adc_i2s_format |
                         OXYGEN_I2S_MCLK_256 | OXYGEN_I2S_BITS_16 |
                         OXYGEN_I2S_MASTER | OXYGEN_I2S_BCLK_64);
      else
            oxygen_write16(chip, OXYGEN_I2S_B_FORMAT,
                         OXYGEN_I2S_MASTER | OXYGEN_I2S_MUTE_MCLK);
      oxygen_write16(chip, OXYGEN_I2S_C_FORMAT,
                   OXYGEN_I2S_MASTER | OXYGEN_I2S_MUTE_MCLK);
      oxygen_clear_bits32(chip, OXYGEN_SPDIF_CONTROL,
                      OXYGEN_SPDIF_OUT_ENABLE |
                      OXYGEN_SPDIF_LOOPBACK);
      if (chip->model->pcm_dev_cfg & CAPTURE_1_FROM_SPDIF)
            oxygen_write32_masked(chip, OXYGEN_SPDIF_CONTROL,
                              OXYGEN_SPDIF_SENSE_MASK |
                              OXYGEN_SPDIF_LOCK_MASK |
                              OXYGEN_SPDIF_RATE_MASK |
                              OXYGEN_SPDIF_LOCK_PAR |
                              OXYGEN_SPDIF_IN_CLOCK_96,
                              OXYGEN_SPDIF_SENSE_MASK |
                              OXYGEN_SPDIF_LOCK_MASK |
                              OXYGEN_SPDIF_RATE_MASK |
                              OXYGEN_SPDIF_SENSE_PAR |
                              OXYGEN_SPDIF_LOCK_PAR |
                              OXYGEN_SPDIF_IN_CLOCK_MASK);
      else
            oxygen_clear_bits32(chip, OXYGEN_SPDIF_CONTROL,
                            OXYGEN_SPDIF_SENSE_MASK |
                            OXYGEN_SPDIF_LOCK_MASK |
                            OXYGEN_SPDIF_RATE_MASK);
      oxygen_write32(chip, OXYGEN_SPDIF_OUTPUT_BITS, chip->spdif_bits);
      oxygen_write16(chip, OXYGEN_2WIRE_BUS_STATUS,
                   OXYGEN_2WIRE_LENGTH_8 |
                   OXYGEN_2WIRE_INTERRUPT_MASK |
                   OXYGEN_2WIRE_SPEED_STANDARD);
      oxygen_clear_bits8(chip, OXYGEN_MPU401_CONTROL, OXYGEN_MPU401_LOOPBACK);
      oxygen_write8(chip, OXYGEN_GPI_INTERRUPT_MASK, 0);
      oxygen_write16(chip, OXYGEN_GPIO_INTERRUPT_MASK, 0);
      oxygen_write16(chip, OXYGEN_PLAY_ROUTING,
                   OXYGEN_PLAY_MULTICH_I2S_DAC |
                   OXYGEN_PLAY_SPDIF_SPDIF |
                   (0 << OXYGEN_PLAY_DAC0_SOURCE_SHIFT) |
                   (1 << OXYGEN_PLAY_DAC1_SOURCE_SHIFT) |
                   (2 << OXYGEN_PLAY_DAC2_SOURCE_SHIFT) |
                   (3 << OXYGEN_PLAY_DAC3_SOURCE_SHIFT));
      oxygen_write8(chip, OXYGEN_REC_ROUTING,
                  OXYGEN_REC_A_ROUTE_I2S_ADC_1 |
                  OXYGEN_REC_B_ROUTE_I2S_ADC_2 |
                  OXYGEN_REC_C_ROUTE_SPDIF);
      oxygen_write8(chip, OXYGEN_ADC_MONITOR, 0);
      oxygen_write8(chip, OXYGEN_A_MONITOR_ROUTING,
                  (0 << OXYGEN_A_MONITOR_ROUTE_0_SHIFT) |
                  (1 << OXYGEN_A_MONITOR_ROUTE_1_SHIFT) |
                  (2 << OXYGEN_A_MONITOR_ROUTE_2_SHIFT) |
                  (3 << OXYGEN_A_MONITOR_ROUTE_3_SHIFT));

      if (chip->has_ac97_0 | chip->has_ac97_1)
            oxygen_write8(chip, OXYGEN_AC97_INTERRUPT_MASK,
                        OXYGEN_AC97_INT_READ_DONE |
                        OXYGEN_AC97_INT_WRITE_DONE);
      else
            oxygen_write8(chip, OXYGEN_AC97_INTERRUPT_MASK, 0);
      oxygen_write32(chip, OXYGEN_AC97_OUT_CONFIG, 0);
      oxygen_write32(chip, OXYGEN_AC97_IN_CONFIG, 0);
      if (!(chip->has_ac97_0 | chip->has_ac97_1))
            oxygen_set_bits16(chip, OXYGEN_AC97_CONTROL,
                          OXYGEN_AC97_CLOCK_DISABLE);
      if (!chip->has_ac97_0) {
            oxygen_set_bits16(chip, OXYGEN_AC97_CONTROL,
                          OXYGEN_AC97_NO_CODEC_0);
      } else {
            oxygen_write_ac97(chip, 0, AC97_RESET, 0);
            msleep(1);
            oxygen_ac97_set_bits(chip, 0, CM9780_GPIO_SETUP,
                             CM9780_GPIO0IO | CM9780_GPIO1IO);
            oxygen_ac97_set_bits(chip, 0, CM9780_MIXER,
                             CM9780_BSTSEL | CM9780_STRO_MIC |
                             CM9780_MIX2FR | CM9780_PCBSW);
            oxygen_ac97_set_bits(chip, 0, CM9780_JACK,
                             CM9780_RSOE | CM9780_CBOE |
                             CM9780_SSOE | CM9780_FROE |
                             CM9780_MIC2MIC | CM9780_LI2LI);
            oxygen_write_ac97(chip, 0, AC97_MASTER, 0x0000);
            oxygen_write_ac97(chip, 0, AC97_PC_BEEP, 0x8000);
            oxygen_write_ac97(chip, 0, AC97_MIC, 0x8808);
            oxygen_write_ac97(chip, 0, AC97_LINE, 0x0808);
            oxygen_write_ac97(chip, 0, AC97_CD, 0x8808);
            oxygen_write_ac97(chip, 0, AC97_VIDEO, 0x8808);
            oxygen_write_ac97(chip, 0, AC97_AUX, 0x8808);
            oxygen_write_ac97(chip, 0, AC97_REC_GAIN, 0x8000);
            oxygen_write_ac97(chip, 0, AC97_CENTER_LFE_MASTER, 0x8080);
            oxygen_write_ac97(chip, 0, AC97_SURROUND_MASTER, 0x8080);
            oxygen_ac97_clear_bits(chip, 0, CM9780_GPIO_STATUS,
                               CM9780_GPO0);
            /* power down unused ADCs and DACs */
            oxygen_ac97_set_bits(chip, 0, AC97_POWERDOWN,
                             AC97_PD_PR0 | AC97_PD_PR1);
            oxygen_ac97_set_bits(chip, 0, AC97_EXTENDED_STATUS,
                             AC97_EA_PRI | AC97_EA_PRJ | AC97_EA_PRK);
      }
      if (chip->has_ac97_1) {
            oxygen_set_bits32(chip, OXYGEN_AC97_OUT_CONFIG,
                          OXYGEN_AC97_CODEC1_SLOT3 |
                          OXYGEN_AC97_CODEC1_SLOT4);
            oxygen_write_ac97(chip, 1, AC97_RESET, 0);
            msleep(1);
            oxygen_write_ac97(chip, 1, AC97_MASTER, 0x0000);
            oxygen_write_ac97(chip, 1, AC97_HEADPHONE, 0x8000);
            oxygen_write_ac97(chip, 1, AC97_PC_BEEP, 0x8000);
            oxygen_write_ac97(chip, 1, AC97_MIC, 0x8808);
            oxygen_write_ac97(chip, 1, AC97_LINE, 0x8808);
            oxygen_write_ac97(chip, 1, AC97_CD, 0x8808);
            oxygen_write_ac97(chip, 1, AC97_VIDEO, 0x8808);
            oxygen_write_ac97(chip, 1, AC97_AUX, 0x8808);
            oxygen_write_ac97(chip, 1, AC97_PCM, 0x0808);
            oxygen_write_ac97(chip, 1, AC97_REC_SEL, 0x0000);
            oxygen_write_ac97(chip, 1, AC97_REC_GAIN, 0x0000);
            oxygen_ac97_set_bits(chip, 1, 0x6a, 0x0040);
      }
}

static void oxygen_card_free(struct snd_card *card)
{
      struct oxygen *chip = card->private_data;

      spin_lock_irq(&chip->reg_lock);
      chip->interrupt_mask = 0;
      chip->pcm_running = 0;
      oxygen_write16(chip, OXYGEN_DMA_STATUS, 0);
      oxygen_write16(chip, OXYGEN_INTERRUPT_MASK, 0);
      spin_unlock_irq(&chip->reg_lock);
      if (chip->irq >= 0)
            free_irq(chip->irq, chip);
      flush_scheduled_work();
      chip->model->cleanup(chip);
      mutex_destroy(&chip->mutex);
      pci_release_regions(chip->pci);
      pci_disable_device(chip->pci);
}

int oxygen_pci_probe(struct pci_dev *pci, int index, char *id,
                 const struct oxygen_model *model)
{
      struct snd_card *card;
      struct oxygen *chip;
      int err;

      card = snd_card_new(index, id, model->owner,
                      sizeof *chip + model->model_data_size);
      if (!card)
            return -ENOMEM;

      chip = card->private_data;
      chip->card = card;
      chip->pci = pci;
      chip->irq = -1;
      chip->model = model;
      chip->model_data = chip + 1;
      spin_lock_init(&chip->reg_lock);
      mutex_init(&chip->mutex);
      INIT_WORK(&chip->spdif_input_bits_work,
              oxygen_spdif_input_bits_changed);
      INIT_WORK(&chip->gpio_work, oxygen_gpio_changed);
      init_waitqueue_head(&chip->ac97_waitqueue);

      err = pci_enable_device(pci);
      if (err < 0)
            goto err_card;

      err = pci_request_regions(pci, model->chip);
      if (err < 0) {
            snd_printk(KERN_ERR "cannot reserve PCI resources\n");
            goto err_pci_enable;
      }

      if (!(pci_resource_flags(pci, 0) & IORESOURCE_IO) ||
          pci_resource_len(pci, 0) < OXYGEN_IO_SIZE) {
            snd_printk(KERN_ERR "invalid PCI I/O range\n");
            err = -ENXIO;
            goto err_pci_regions;
      }
      chip->addr = pci_resource_start(pci, 0);

      pci_set_master(pci);
      snd_card_set_dev(card, &pci->dev);
      card->private_free = oxygen_card_free;

      oxygen_init(chip);
      model->init(chip);

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

      strcpy(card->driver, model->chip);
      strcpy(card->shortname, model->shortname);
      sprintf(card->longname, "%s (rev %u) at %#lx, irq %i",
            model->longname, chip->revision, chip->addr, chip->irq);
      strcpy(card->mixername, model->chip);
      snd_component_add(card, model->chip);

      err = oxygen_pcm_init(chip);
      if (err < 0)
            goto err_card;

      err = oxygen_mixer_init(chip);
      if (err < 0)
            goto err_card;

      if (model->misc_flags & OXYGEN_MISC_MIDI) {
            err = snd_mpu401_uart_new(card, 0, MPU401_HW_CMIPCI,
                                chip->addr + OXYGEN_MPU401,
                                MPU401_INFO_INTEGRATED, 0, 0,
                                &chip->midi);
            if (err < 0)
                  goto err_card;
      }

      oxygen_proc_init(chip);

      spin_lock_irq(&chip->reg_lock);
      if (chip->model->pcm_dev_cfg & CAPTURE_1_FROM_SPDIF)
            chip->interrupt_mask |= OXYGEN_INT_SPDIF_IN_DETECT;
      if (chip->has_ac97_0 | chip->has_ac97_1)
            chip->interrupt_mask |= OXYGEN_INT_AC97;
      oxygen_write16(chip, OXYGEN_INTERRUPT_MASK, chip->interrupt_mask);
      spin_unlock_irq(&chip->reg_lock);

      err = snd_card_register(card);
      if (err < 0)
            goto err_card;

      pci_set_drvdata(pci, card);
      return 0;

err_pci_regions:
      pci_release_regions(pci);
err_pci_enable:
      pci_disable_device(pci);
err_card:
      snd_card_free(card);
      return err;
}
EXPORT_SYMBOL(oxygen_pci_probe);

void oxygen_pci_remove(struct pci_dev *pci)
{
      snd_card_free(pci_get_drvdata(pci));
      pci_set_drvdata(pci, NULL);
}
EXPORT_SYMBOL(oxygen_pci_remove);

#ifdef CONFIG_PM
int oxygen_pci_suspend(struct pci_dev *pci, pm_message_t state)
{
      struct snd_card *card = pci_get_drvdata(pci);
      struct oxygen *chip = card->private_data;
      unsigned int i, saved_interrupt_mask;

      snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);

      for (i = 0; i < PCM_COUNT; ++i)
            if (chip->streams[i])
                  snd_pcm_suspend(chip->streams[i]);

      if (chip->model->suspend)
            chip->model->suspend(chip);

      spin_lock_irq(&chip->reg_lock);
      saved_interrupt_mask = chip->interrupt_mask;
      chip->interrupt_mask = 0;
      oxygen_write16(chip, OXYGEN_DMA_STATUS, 0);
      oxygen_write16(chip, OXYGEN_INTERRUPT_MASK, 0);
      spin_unlock_irq(&chip->reg_lock);

      synchronize_irq(chip->irq);
      flush_scheduled_work();
      chip->interrupt_mask = saved_interrupt_mask;

      pci_disable_device(pci);
      pci_save_state(pci);
      pci_set_power_state(pci, pci_choose_state(pci, state));
      return 0;
}
EXPORT_SYMBOL(oxygen_pci_suspend);

static const u32 registers_to_restore[OXYGEN_IO_SIZE / 32] = {
      0xffffffff, 0x00ff077f, 0x00011d08, 0x007f00ff,
      0x00300000, 0x00000fe4, 0x0ff7001f, 0x00000000
};
static const u32 ac97_registers_to_restore[2][0x40 / 32] = {
      { 0x18284fa2, 0x03060000 },
      { 0x00007fa6, 0x00200000 }
};

static inline int is_bit_set(const u32 *bitmap, unsigned int bit)
{
      return bitmap[bit / 32] & (1 << (bit & 31));
}

static void oxygen_restore_ac97(struct oxygen *chip, unsigned int codec)
{
      unsigned int i;

      oxygen_write_ac97(chip, codec, AC97_RESET, 0);
      msleep(1);
      for (i = 1; i < 0x40; ++i)
            if (is_bit_set(ac97_registers_to_restore[codec], i))
                  oxygen_write_ac97(chip, codec, i * 2,
                                chip->saved_ac97_registers[codec][i]);
}

int oxygen_pci_resume(struct pci_dev *pci)
{
      struct snd_card *card = pci_get_drvdata(pci);
      struct oxygen *chip = card->private_data;
      unsigned int i;

      pci_set_power_state(pci, PCI_D0);
      pci_restore_state(pci);
      if (pci_enable_device(pci) < 0) {
            snd_printk(KERN_ERR "cannot reenable device");
            snd_card_disconnect(card);
            return -EIO;
      }
      pci_set_master(pci);

      oxygen_write16(chip, OXYGEN_DMA_STATUS, 0);
      oxygen_write16(chip, OXYGEN_INTERRUPT_MASK, 0);
      for (i = 0; i < OXYGEN_IO_SIZE; ++i)
            if (is_bit_set(registers_to_restore, i))
                  oxygen_write8(chip, i, chip->saved_registers._8[i]);
      if (chip->has_ac97_0)
            oxygen_restore_ac97(chip, 0);
      if (chip->has_ac97_1)
            oxygen_restore_ac97(chip, 1);

      if (chip->model->resume)
            chip->model->resume(chip);

      oxygen_write16(chip, OXYGEN_INTERRUPT_MASK, chip->interrupt_mask);

      snd_power_change_state(card, SNDRV_CTL_POWER_D0);
      return 0;
}
EXPORT_SYMBOL(oxygen_pci_resume);
#endif /* CONFIG_PM */

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