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cs5535audio.c

/*
 * Driver for audio on multifunction CS5535/6 companion device
 * Copyright (C) Jaya Kumar
 *
 * Based on Jaroslav Kysela and Takashi Iwai's examples.
 * This work was sponsored by CIS(M) Sdn Bhd.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */

#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/slab.h>
#include <linux/moduleparam.h>
#include <asm/io.h>
#include <sound/core.h>
#include <sound/control.h>
#include <sound/pcm.h>
#include <sound/rawmidi.h>
#include <sound/ac97_codec.h>
#include <sound/initval.h>
#include <sound/asoundef.h>
#include "cs5535audio.h"

#define DRIVER_NAME "cs5535audio"

static char *ac97_quirk;
module_param(ac97_quirk, charp, 0444);
MODULE_PARM_DESC(ac97_quirk, "AC'97 board specific workarounds.");

static struct ac97_quirk ac97_quirks[] __devinitdata = {
#if 0 /* Not yet confirmed if all 5536 boards are HP only */
      {
            .subvendor = PCI_VENDOR_ID_AMD, 
            .subdevice = PCI_DEVICE_ID_AMD_CS5536_AUDIO, 
            .name = "AMD RDK",     
            .type = AC97_TUNE_HP_ONLY
      },
#endif
      {}
};

static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;
static int enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;

module_param_array(index, int, NULL, 0444);
MODULE_PARM_DESC(index, "Index value for " DRIVER_NAME);
module_param_array(id, charp, NULL, 0444);
MODULE_PARM_DESC(id, "ID string for " DRIVER_NAME);
module_param_array(enable, bool, NULL, 0444);
MODULE_PARM_DESC(enable, "Enable " DRIVER_NAME);

static struct pci_device_id snd_cs5535audio_ids[] = {
      { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_CS5535_AUDIO) },
      { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_AUDIO) },
      {}
};

MODULE_DEVICE_TABLE(pci, snd_cs5535audio_ids);

static void wait_till_cmd_acked(struct cs5535audio *cs5535au, unsigned long timeout)
{
      unsigned int tmp;
      do {
            tmp = cs_readl(cs5535au, ACC_CODEC_CNTL);
            if (!(tmp & CMD_NEW))
                  break;
            udelay(1);
      } while (--timeout);
      if (!timeout)
            snd_printk(KERN_ERR "Failure writing to cs5535 codec\n");
}

static unsigned short snd_cs5535audio_codec_read(struct cs5535audio *cs5535au,
                                     unsigned short reg)
{
      unsigned int regdata;
      unsigned int timeout;
      unsigned int val;

      regdata = ((unsigned int) reg) << 24;
      regdata |= ACC_CODEC_CNTL_RD_CMD;
      regdata |= CMD_NEW;

      cs_writel(cs5535au, ACC_CODEC_CNTL, regdata);
      wait_till_cmd_acked(cs5535au, 50);

      timeout = 50;
      do {
            val = cs_readl(cs5535au, ACC_CODEC_STATUS);
            if ((val & STS_NEW) && reg == (val >> 24))
                  break;
            udelay(1);
      } while (--timeout);
      if (!timeout)
            snd_printk(KERN_ERR "Failure reading codec reg 0x%x,"
                              "Last value=0x%x\n", reg, val);

      return (unsigned short) val;
}

static void snd_cs5535audio_codec_write(struct cs5535audio *cs5535au,
                              unsigned short reg, unsigned short val)
{
      unsigned int regdata;

      regdata = ((unsigned int) reg) << 24;
      regdata |= val;
      regdata &= CMD_MASK;
      regdata |= CMD_NEW;
      regdata &= ACC_CODEC_CNTL_WR_CMD;

      cs_writel(cs5535au, ACC_CODEC_CNTL, regdata);
      wait_till_cmd_acked(cs5535au, 50);
}

static void snd_cs5535audio_ac97_codec_write(struct snd_ac97 *ac97,
                                   unsigned short reg, unsigned short val)
{
      struct cs5535audio *cs5535au = ac97->private_data;
      snd_cs5535audio_codec_write(cs5535au, reg, val);
}

static unsigned short snd_cs5535audio_ac97_codec_read(struct snd_ac97 *ac97,
                                          unsigned short reg)
{
      struct cs5535audio *cs5535au = ac97->private_data;
      return snd_cs5535audio_codec_read(cs5535au, reg);
}

static int __devinit snd_cs5535audio_mixer(struct cs5535audio *cs5535au)
{
      struct snd_card *card = cs5535au->card;
      struct snd_ac97_bus *pbus;
      struct snd_ac97_template ac97;
      int err;
      static struct snd_ac97_bus_ops ops = {
            .write = snd_cs5535audio_ac97_codec_write,
            .read = snd_cs5535audio_ac97_codec_read,
      };

      if ((err = snd_ac97_bus(card, 0, &ops, NULL, &pbus)) < 0)
            return err;

      memset(&ac97, 0, sizeof(ac97));
      ac97.scaps = AC97_SCAP_AUDIO|AC97_SCAP_SKIP_MODEM;
      ac97.private_data = cs5535au;
      ac97.pci = cs5535au->pci;

      if ((err = snd_ac97_mixer(pbus, &ac97, &cs5535au->ac97)) < 0) {
            snd_printk(KERN_ERR "mixer failed\n");
            return err;
      }

      snd_ac97_tune_hardware(cs5535au->ac97, ac97_quirks, ac97_quirk);

      return 0;
}

static void process_bm0_irq(struct cs5535audio *cs5535au)
{
      u8 bm_stat;
      spin_lock(&cs5535au->reg_lock);
      bm_stat = cs_readb(cs5535au, ACC_BM0_STATUS);
      spin_unlock(&cs5535au->reg_lock);
      if (bm_stat & EOP) {
            struct cs5535audio_dma *dma;
            dma = cs5535au->playback_substream->runtime->private_data;
            snd_pcm_period_elapsed(cs5535au->playback_substream);
      } else {
            snd_printk(KERN_ERR "unexpected bm0 irq src, bm_stat=%x\n",
                              bm_stat);
      }
}

static void process_bm1_irq(struct cs5535audio *cs5535au)
{
      u8 bm_stat;
      spin_lock(&cs5535au->reg_lock);
      bm_stat = cs_readb(cs5535au, ACC_BM1_STATUS);
      spin_unlock(&cs5535au->reg_lock);
      if (bm_stat & EOP) {
            struct cs5535audio_dma *dma;
            dma = cs5535au->capture_substream->runtime->private_data;
            snd_pcm_period_elapsed(cs5535au->capture_substream);
      }
}

static irqreturn_t snd_cs5535audio_interrupt(int irq, void *dev_id)
{
      u16 acc_irq_stat;
      unsigned char count;
      struct cs5535audio *cs5535au = dev_id;

      if (cs5535au == NULL)
            return IRQ_NONE;

      acc_irq_stat = cs_readw(cs5535au, ACC_IRQ_STATUS);

      if (!acc_irq_stat)
            return IRQ_NONE;
      for (count = 0; count < 4; count++) {
            if (acc_irq_stat & (1 << count)) {
                  switch (count) {
                  case IRQ_STS:
                        cs_readl(cs5535au, ACC_GPIO_STATUS);
                        break;
                  case WU_IRQ_STS:
                        cs_readl(cs5535au, ACC_GPIO_STATUS);
                        break;
                  case BM0_IRQ_STS:
                        process_bm0_irq(cs5535au);
                        break;
                  case BM1_IRQ_STS:
                        process_bm1_irq(cs5535au);
                        break;
                  default:
                        snd_printk(KERN_ERR "Unexpected irq src: "
                                    "0x%x\n", acc_irq_stat);
                        break;
                  }
            }
      }
      return IRQ_HANDLED;
}

static int snd_cs5535audio_free(struct cs5535audio *cs5535au)
{
      synchronize_irq(cs5535au->irq);
      pci_set_power_state(cs5535au->pci, 3);

      if (cs5535au->irq >= 0)
            free_irq(cs5535au->irq, cs5535au);

      pci_release_regions(cs5535au->pci);
      pci_disable_device(cs5535au->pci);
      kfree(cs5535au);
      return 0;
}

static int snd_cs5535audio_dev_free(struct snd_device *device)
{
      struct cs5535audio *cs5535au = device->device_data;
      return snd_cs5535audio_free(cs5535au);
}

static int __devinit snd_cs5535audio_create(struct snd_card *card,
                                  struct pci_dev *pci,
                                  struct cs5535audio **rcs5535au)
{
      struct cs5535audio *cs5535au;

      int err;
      static struct snd_device_ops ops = {
            .dev_free = snd_cs5535audio_dev_free,
      };

      *rcs5535au = NULL;
      if ((err = pci_enable_device(pci)) < 0)
            return err;

      if (pci_set_dma_mask(pci, DMA_32BIT_MASK) < 0 ||
          pci_set_consistent_dma_mask(pci, DMA_32BIT_MASK) < 0) {
            printk(KERN_WARNING "unable to get 32bit dma\n");
            err = -ENXIO;
            goto pcifail;
      }

      cs5535au = kzalloc(sizeof(*cs5535au), GFP_KERNEL);
      if (cs5535au == NULL) {
            err = -ENOMEM;
            goto pcifail;
      }

      spin_lock_init(&cs5535au->reg_lock);
      cs5535au->card = card;
      cs5535au->pci = pci;
      cs5535au->irq = -1;

      if ((err = pci_request_regions(pci, "CS5535 Audio")) < 0) {
            kfree(cs5535au);
            goto pcifail;
      }

      cs5535au->port = pci_resource_start(pci, 0);

      if (request_irq(pci->irq, snd_cs5535audio_interrupt,
                  IRQF_SHARED, "CS5535 Audio", cs5535au)) {
            snd_printk("unable to grab IRQ %d\n", pci->irq);
            err = -EBUSY;
            goto sndfail;
      }

      cs5535au->irq = pci->irq;
      pci_set_master(pci);

      if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL,
                          cs5535au, &ops)) < 0)
            goto sndfail;

      snd_card_set_dev(card, &pci->dev);

      *rcs5535au = cs5535au;
      return 0;

sndfail: /* leave the device alive, just kill the snd */
      snd_cs5535audio_free(cs5535au);
      return err;

pcifail:
      pci_disable_device(pci);
      return err;
}

static int __devinit snd_cs5535audio_probe(struct pci_dev *pci,
                                 const struct pci_device_id *pci_id)
{
      static int dev;
      struct snd_card *card;
      struct cs5535audio *cs5535au;
      int err;

      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 == NULL)
            return -ENOMEM;

      if ((err = snd_cs5535audio_create(card, pci, &cs5535au)) < 0)
            goto probefail_out;

      card->private_data = cs5535au;

      if ((err = snd_cs5535audio_mixer(cs5535au)) < 0)
            goto probefail_out;

      if ((err = snd_cs5535audio_pcm(cs5535au)) < 0)
            goto probefail_out;

      strcpy(card->driver, DRIVER_NAME);

      strcpy(card->shortname, "CS5535 Audio");
      sprintf(card->longname, "%s %s at 0x%lx, irq %i",
            card->shortname, card->driver,
            cs5535au->port, cs5535au->irq);

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

      pci_set_drvdata(pci, card);
      dev++;
      return 0;

probefail_out:
      snd_card_free(card);
      return err;
}

static void __devexit snd_cs5535audio_remove(struct pci_dev *pci)
{
      snd_card_free(pci_get_drvdata(pci));
      pci_set_drvdata(pci, NULL);
}

static struct pci_driver driver = {
      .name = DRIVER_NAME,
      .id_table = snd_cs5535audio_ids,
      .probe = snd_cs5535audio_probe,
      .remove = __devexit_p(snd_cs5535audio_remove),
#ifdef CONFIG_PM
      .suspend = snd_cs5535audio_suspend,
      .resume = snd_cs5535audio_resume,
#endif
};

static int __init alsa_card_cs5535audio_init(void)
{
      return pci_register_driver(&driver);
}

static void __exit alsa_card_cs5535audio_exit(void)
{
      pci_unregister_driver(&driver);
}

module_init(alsa_card_cs5535audio_init)
module_exit(alsa_card_cs5535audio_exit)

MODULE_AUTHOR("Jaya Kumar");
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("CS5535 Audio");
MODULE_SUPPORTED_DEVICE("CS5535 Audio");

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