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pdaudiocf_core.c

/*
 * Driver for Sound Core PDAudioCF soundcard
 *
 * Copyright (c) 2003 by Jaroslav Kysela <perex@perex.cz>
 *
 *   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 <sound/core.h>
#include <sound/info.h>
#include "pdaudiocf.h"
#include <sound/initval.h>

/*
 *
 */
static unsigned char pdacf_ak4117_read(void *private_data, unsigned char reg)
{
      struct snd_pdacf *chip = private_data;
      unsigned long timeout;
      unsigned long flags;
      unsigned char res;

      spin_lock_irqsave(&chip->ak4117_lock, flags);
      timeout = 1000;
      while (pdacf_reg_read(chip, PDAUDIOCF_REG_SCR) & PDAUDIOCF_AK_SBP) {
            udelay(5);
            if (--timeout == 0) {
                  spin_unlock_irqrestore(&chip->ak4117_lock, flags);
                  snd_printk(KERN_ERR "AK4117 ready timeout (read)\n");
                  return 0;
            }
      }
      pdacf_reg_write(chip, PDAUDIOCF_REG_AK_IFR, (u16)reg << 8);
      timeout = 1000;
      while (pdacf_reg_read(chip, PDAUDIOCF_REG_SCR) & PDAUDIOCF_AK_SBP) {
            udelay(5);
            if (--timeout == 0) {
                  spin_unlock_irqrestore(&chip->ak4117_lock, flags);
                  snd_printk(KERN_ERR "AK4117 read timeout (read2)\n");
                  return 0;
            }
      }
      res = (unsigned char)pdacf_reg_read(chip, PDAUDIOCF_REG_AK_IFR);
      spin_unlock_irqrestore(&chip->ak4117_lock, flags);
      return res;
}

static void pdacf_ak4117_write(void *private_data, unsigned char reg, unsigned char val)
{
      struct snd_pdacf *chip = private_data;
      unsigned long timeout;
      unsigned long flags;

      spin_lock_irqsave(&chip->ak4117_lock, flags);
      timeout = 1000;
      while (inw(chip->port + PDAUDIOCF_REG_SCR) & PDAUDIOCF_AK_SBP) {
            udelay(5);
            if (--timeout == 0) {
                  spin_unlock_irqrestore(&chip->ak4117_lock, flags);
                  snd_printk(KERN_ERR "AK4117 ready timeout (write)\n");
                  return;
            }
      }
      outw((u16)reg << 8 | val | (1<<13), chip->port + PDAUDIOCF_REG_AK_IFR);
      spin_unlock_irqrestore(&chip->ak4117_lock, flags);
}

#if 0
void pdacf_dump(struct snd_pdacf *chip)
{
      printk("PDAUDIOCF DUMP (0x%lx):\n", chip->port);
      printk("WPD         : 0x%x\n", inw(chip->port + PDAUDIOCF_REG_WDP));
      printk("RDP         : 0x%x\n", inw(chip->port + PDAUDIOCF_REG_RDP));
      printk("TCR         : 0x%x\n", inw(chip->port + PDAUDIOCF_REG_TCR));
      printk("SCR         : 0x%x\n", inw(chip->port + PDAUDIOCF_REG_SCR));
      printk("ISR         : 0x%x\n", inw(chip->port + PDAUDIOCF_REG_ISR));
      printk("IER         : 0x%x\n", inw(chip->port + PDAUDIOCF_REG_IER));
      printk("AK_IFR      : 0x%x\n", inw(chip->port + PDAUDIOCF_REG_AK_IFR));
}
#endif

static int pdacf_reset(struct snd_pdacf *chip, int powerdown)
{
      u16 val;
      
      val = pdacf_reg_read(chip, PDAUDIOCF_REG_SCR);
      val |= PDAUDIOCF_PDN;
      val &= ~PDAUDIOCF_RECORD;           /* for sure */
      pdacf_reg_write(chip, PDAUDIOCF_REG_SCR, val);
      udelay(5);
      val |= PDAUDIOCF_RST;
      pdacf_reg_write(chip, PDAUDIOCF_REG_SCR, val);
      udelay(200);
      val &= ~PDAUDIOCF_RST;
      pdacf_reg_write(chip, PDAUDIOCF_REG_SCR, val);
      udelay(5);
      if (!powerdown) {
            val &= ~PDAUDIOCF_PDN;
            pdacf_reg_write(chip, PDAUDIOCF_REG_SCR, val);
            udelay(200);
      }
      return 0;
}

void pdacf_reinit(struct snd_pdacf *chip, int resume)
{
      pdacf_reset(chip, 0);
      if (resume)
            pdacf_reg_write(chip, PDAUDIOCF_REG_SCR, chip->suspend_reg_scr);
      snd_ak4117_reinit(chip->ak4117);
      pdacf_reg_write(chip, PDAUDIOCF_REG_TCR, chip->regmap[PDAUDIOCF_REG_TCR>>1]);
      pdacf_reg_write(chip, PDAUDIOCF_REG_IER, chip->regmap[PDAUDIOCF_REG_IER>>1]);
}

static void pdacf_proc_read(struct snd_info_entry * entry,
                            struct snd_info_buffer *buffer)
{
      struct snd_pdacf *chip = entry->private_data;
      u16 tmp;

      snd_iprintf(buffer, "PDAudioCF\n\n");
      tmp = pdacf_reg_read(chip, PDAUDIOCF_REG_SCR);
      snd_iprintf(buffer, "FPGA revision      : 0x%x\n", PDAUDIOCF_FPGAREV(tmp));
                                         
}

static void pdacf_proc_init(struct snd_pdacf *chip)
{
      struct snd_info_entry *entry;

      if (! snd_card_proc_new(chip->card, "pdaudiocf", &entry))
            snd_info_set_text_ops(entry, chip, pdacf_proc_read);
}

struct snd_pdacf *snd_pdacf_create(struct snd_card *card)
{
      struct snd_pdacf *chip;

      chip = kzalloc(sizeof(*chip), GFP_KERNEL);
      if (chip == NULL)
            return NULL;
      chip->card = card;
      spin_lock_init(&chip->reg_lock);
      spin_lock_init(&chip->ak4117_lock);
      tasklet_init(&chip->tq, pdacf_tasklet, (unsigned long)chip);
      card->private_data = chip;

      pdacf_proc_init(chip);
      return chip;
}

static void snd_pdacf_ak4117_change(struct ak4117 *ak4117, unsigned char c0, unsigned char c1)
{
      struct snd_pdacf *chip = ak4117->change_callback_private;
      unsigned long flags;
      u16 val;

      if (!(c0 & AK4117_UNLCK))
            return;
      spin_lock_irqsave(&chip->reg_lock, flags);
      val = chip->regmap[PDAUDIOCF_REG_SCR>>1];
      if (ak4117->rcs0 & AK4117_UNLCK)
            val |= PDAUDIOCF_BLUE_LED_OFF;
      else
            val &= ~PDAUDIOCF_BLUE_LED_OFF;
      pdacf_reg_write(chip, PDAUDIOCF_REG_SCR, val);
      spin_unlock_irqrestore(&chip->reg_lock, flags);
}

int snd_pdacf_ak4117_create(struct snd_pdacf *chip)
{
      int err;
      u16 val;
      /* design note: if we unmask PLL unlock, parity, valid, audio or auto bit interrupts */
      /* from AK4117 then INT1 pin from AK4117 will be high all time, because PCMCIA interrupts are */
      /* egde based and FPGA does logical OR for all interrupt sources, we cannot use these */
      /* high-rate sources */
      static unsigned char pgm[5] = {
            AK4117_XTL_24_576M | AK4117_EXCT,                     /* AK4117_REG_PWRDN */
            AK4117_CM_PLL_XTAL | AK4117_PKCS_128fs | AK4117_XCKS_128fs, /* AK4117_REQ_CLOCK */
            AK4117_EFH_1024LRCLK | AK4117_DIF_24R | AK4117_IPS,         /* AK4117_REG_IO */
            0xff,                                           /* AK4117_REG_INT0_MASK */
            AK4117_MAUTO | AK4117_MAUD | AK4117_MULK | AK4117_MPAR | AK4117_MV, /* AK4117_REG_INT1_MASK */
      };

      err = pdacf_reset(chip, 0);
      if (err < 0)
            return err;
      err = snd_ak4117_create(chip->card, pdacf_ak4117_read, pdacf_ak4117_write, pgm, chip, &chip->ak4117);
      if (err < 0)
            return err;

      val = pdacf_reg_read(chip, PDAUDIOCF_REG_TCR);
#if 1 /* normal operation */
      val &= ~(PDAUDIOCF_ELIMAKMBIT|PDAUDIOCF_TESTDATASEL);
#else /* debug */
      val |= PDAUDIOCF_ELIMAKMBIT;
      val &= ~PDAUDIOCF_TESTDATASEL;
#endif
      pdacf_reg_write(chip, PDAUDIOCF_REG_TCR, val);
      
      /* setup the FPGA to match AK4117 setup */
      val = pdacf_reg_read(chip, PDAUDIOCF_REG_SCR);
      val &= ~(PDAUDIOCF_CLKDIV0 | PDAUDIOCF_CLKDIV1);            /* use 24.576Mhz clock */
      val &= ~(PDAUDIOCF_RED_LED_OFF|PDAUDIOCF_BLUE_LED_OFF);
      val |= PDAUDIOCF_DATAFMT0 | PDAUDIOCF_DATAFMT1;             /* 24-bit data */
      pdacf_reg_write(chip, PDAUDIOCF_REG_SCR, val);

      /* setup LEDs and IRQ */
      val = pdacf_reg_read(chip, PDAUDIOCF_REG_IER);
      val &= ~(PDAUDIOCF_IRQLVLEN0 | PDAUDIOCF_IRQLVLEN1);
      val &= ~(PDAUDIOCF_BLUEDUTY0 | PDAUDIOCF_REDDUTY0 | PDAUDIOCF_REDDUTY1);
      val |= PDAUDIOCF_BLUEDUTY1 | PDAUDIOCF_HALFRATE;
      val |= PDAUDIOCF_IRQOVREN | PDAUDIOCF_IRQAKMEN;
      pdacf_reg_write(chip, PDAUDIOCF_REG_IER, val);

      chip->ak4117->change_callback_private = chip;
      chip->ak4117->change_callback = snd_pdacf_ak4117_change;

      /* update LED status */
      snd_pdacf_ak4117_change(chip->ak4117, AK4117_UNLCK, 0);

      return 0;
}

void snd_pdacf_powerdown(struct snd_pdacf *chip)
{
      u16 val;

      val = pdacf_reg_read(chip, PDAUDIOCF_REG_SCR);
      chip->suspend_reg_scr = val;
      val |= PDAUDIOCF_RED_LED_OFF | PDAUDIOCF_BLUE_LED_OFF;
      pdacf_reg_write(chip, PDAUDIOCF_REG_SCR, val);
      /* disable interrupts, but use direct write to preserve old register value in chip->regmap */
      val = inw(chip->port + PDAUDIOCF_REG_IER);
      val &= ~(PDAUDIOCF_IRQOVREN|PDAUDIOCF_IRQAKMEN|PDAUDIOCF_IRQLVLEN0|PDAUDIOCF_IRQLVLEN1);
      outw(val, chip->port + PDAUDIOCF_REG_IER);
      pdacf_reset(chip, 1);
}

#ifdef CONFIG_PM

int snd_pdacf_suspend(struct snd_pdacf *chip, pm_message_t state)
{
      u16 val;
      
      snd_power_change_state(chip->card, SNDRV_CTL_POWER_D3hot);
      snd_pcm_suspend_all(chip->pcm);
      /* disable interrupts, but use direct write to preserve old register value in chip->regmap */
      val = inw(chip->port + PDAUDIOCF_REG_IER);
      val &= ~(PDAUDIOCF_IRQOVREN|PDAUDIOCF_IRQAKMEN|PDAUDIOCF_IRQLVLEN0|PDAUDIOCF_IRQLVLEN1);
      outw(val, chip->port + PDAUDIOCF_REG_IER);
      chip->chip_status |= PDAUDIOCF_STAT_IS_SUSPENDED;     /* ignore interrupts from now */
      snd_pdacf_powerdown(chip);
      return 0;
}

static inline int check_signal(struct snd_pdacf *chip)
{
      return (chip->ak4117->rcs0 & AK4117_UNLCK) == 0;
}

int snd_pdacf_resume(struct snd_pdacf *chip)
{
      int timeout = 40;

      pdacf_reinit(chip, 1);
      /* wait for AK4117's PLL */
      while (timeout-- > 0 &&
             (snd_ak4117_external_rate(chip->ak4117) <= 0 || !check_signal(chip)))
            mdelay(1);
      chip->chip_status &= ~PDAUDIOCF_STAT_IS_SUSPENDED;
      snd_power_change_state(chip->card, SNDRV_CTL_POWER_D0);
      return 0;
}
#endif

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