release/src-rt-6.x.4708/linux/linux-2.6.36/sound/pci/ice1712/ak4xxx.c

   1 /*
   2  *   ALSA driver for ICEnsemble ICE1712 (Envy24)
   3  *
   4  *   AK4524 / AK4528 / AK4529 / AK4355 / AK4381 interface
   5  *
   6  *      Copyright (c) 2000 Jaroslav Kysela <perex@perex.cz>
   7  *
   8  *   This program is free software; you can redistribute it and/or modify
   9  *   it under the terms of the GNU General Public License as published by
  10  *   the Free Software Foundation; either version 2 of the License, or
  11  *   (at your option) any later version.
  12  *
  13  *   This program is distributed in the hope that it will be useful,
  14  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *   GNU General Public License for more details.
  17  *
  18  *   You should have received a copy of the GNU General Public License
  19  *   along with this program; if not, write to the Free Software
  20  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  21  *
  22  */
  23
  24 #include <asm/io.h>
  25 #include <linux/delay.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/slab.h>
  28 #include <linux/init.h>
  29 #include <sound/core.h>
  30 #include <sound/initval.h>
  31 #include "ice1712.h"
  32
  33 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
  34 MODULE_DESCRIPTION("ICEnsemble ICE17xx <-> AK4xxx AD/DA chip interface");
  35 MODULE_LICENSE("GPL");
  36
  37 static void snd_ice1712_akm4xxx_lock(struct snd_akm4xxx *ak, int chip)
  38 {
  39         struct snd_ice1712 *ice = ak->private_data[0];
  40
  41         snd_ice1712_save_gpio_status(ice);
  42 }
  43
  44 static void snd_ice1712_akm4xxx_unlock(struct snd_akm4xxx *ak, int chip)
  45 {
  46         struct snd_ice1712 *ice = ak->private_data[0];
  47
  48         snd_ice1712_restore_gpio_status(ice);
  49 }
  50
  51 /*
  52  * write AK4xxx register
  53  */
  54 static void snd_ice1712_akm4xxx_write(struct snd_akm4xxx *ak, int chip,
  55                                       unsigned char addr, unsigned char data)
  56 {
  57         unsigned int tmp;
  58         int idx;
  59         unsigned int addrdata;
  60         struct snd_ak4xxx_private *priv = (void *)ak->private_value[0];
  61         struct snd_ice1712 *ice = ak->private_data[0];
  62
  63         if (snd_BUG_ON(chip < 0 || chip >= 4))
  64                 return;
  65
  66         tmp = snd_ice1712_gpio_read(ice);
  67         tmp |= priv->add_flags;
  68         tmp &= ~priv->mask_flags;
  69         if (priv->cs_mask == priv->cs_addr) {
  70                 if (priv->cif) {
  71                         tmp |= priv->cs_mask; /* start without chip select */
  72                 }  else {
  73                         tmp &= ~priv->cs_mask; /* chip select low */
  74                         snd_ice1712_gpio_write(ice, tmp);
  75                         udelay(1);
  76                 }
  77         } else {
  78                 /* doesn't handle cf=1 yet */
  79                 tmp &= ~priv->cs_mask;
  80                 tmp |= priv->cs_addr;
  81                 snd_ice1712_gpio_write(ice, tmp);
  82                 udelay(1);
  83         }
  84
  85         /* build I2C address + data byte */
  86         addrdata = (priv->caddr << 6) | 0x20 | (addr & 0x1f);
  87         addrdata = (addrdata << 8) | data;
  88         for (idx = 15; idx >= 0; idx--) {
  89                 /* drop clock */
  90                 tmp &= ~priv->clk_mask;
  91                 snd_ice1712_gpio_write(ice, tmp);
  92                 udelay(1);
  93                 /* set data */
  94                 if (addrdata & (1 << idx))
  95                         tmp |= priv->data_mask;
  96                 else
  97                         tmp &= ~priv->data_mask;
  98                 snd_ice1712_gpio_write(ice, tmp);
  99                 udelay(1);
 100                 /* raise clock */
 101                 tmp |= priv->clk_mask;
 102                 snd_ice1712_gpio_write(ice, tmp);
 103                 udelay(1);
 104         }
 105
 106         if (priv->cs_mask == priv->cs_addr) {
 107                 if (priv->cif) {
 108                         /* assert a cs pulse to trigger */
 109                         tmp &= ~priv->cs_mask;
 110                         snd_ice1712_gpio_write(ice, tmp);
 111                         udelay(1);
 112                 }
 113                 tmp |= priv->cs_mask; /* chip select high to trigger */
 114         } else {
 115                 tmp &= ~priv->cs_mask;
 116                 tmp |= priv->cs_none; /* deselect address */
 117         }
 118         snd_ice1712_gpio_write(ice, tmp);
 119         udelay(1);
 120 }
 121
 122 /*
 123  * initialize the struct snd_akm4xxx record with the template
 124  */
 125 int snd_ice1712_akm4xxx_init(struct snd_akm4xxx *ak, const struct snd_akm4xxx *temp,
 126                              const struct snd_ak4xxx_private *_priv, struct snd_ice1712 *ice)
 127 {
 128         struct snd_ak4xxx_private *priv;
 129
 130         if (_priv != NULL) {
 131                 priv = kmalloc(sizeof(*priv), GFP_KERNEL);
 132                 if (priv == NULL)
 133                         return -ENOMEM;
 134                 *priv = *_priv;
 135         } else {
 136                 priv = NULL;
 137         }
 138         *ak = *temp;
 139         ak->card = ice->card;
 140         ak->private_value[0] = (unsigned long)priv;
 141         ak->private_data[0] = ice;
 142         if (ak->ops.lock == NULL)
 143                 ak->ops.lock = snd_ice1712_akm4xxx_lock;
 144         if (ak->ops.unlock == NULL)
 145                 ak->ops.unlock = snd_ice1712_akm4xxx_unlock;
 146         if (ak->ops.write == NULL)
 147                 ak->ops.write = snd_ice1712_akm4xxx_write;
 148         snd_akm4xxx_init(ak);
 149         return 0;
 150 }
 151
 152 void snd_ice1712_akm4xxx_free(struct snd_ice1712 *ice)
 153 {
 154         unsigned int akidx;
 155         if (ice->akm == NULL)
 156                 return;
 157         for (akidx = 0; akidx < ice->akm_codecs; akidx++) {
 158                 struct snd_akm4xxx *ak = &ice->akm[akidx];
 159                 kfree((void*)ak->private_value[0]);
 160         }
 161         kfree(ice->akm);
 162 }
 163
 164 /*
 165  * build AK4xxx controls
 166  */
 167 int snd_ice1712_akm4xxx_build_controls(struct snd_ice1712 *ice)
 168 {
 169         unsigned int akidx;
 170         int err;
 171
 172         for (akidx = 0; akidx < ice->akm_codecs; akidx++) {
 173                 struct snd_akm4xxx *ak = &ice->akm[akidx];
 174                 err = snd_akm4xxx_build_controls(ak);
 175                 if (err < 0)
 176                         return err;
 177         }
 178         return 0;
 179 }
 180
 181 static int __init alsa_ice1712_akm4xxx_module_init(void)
 182 {
 183         return 0;
 184 }
 185
 186 static void __exit alsa_ice1712_akm4xxx_module_exit(void)
 187 {
 188 }
 189
 190 module_init(alsa_ice1712_akm4xxx_module_init)
 191 module_exit(alsa_ice1712_akm4xxx_module_exit)
 192
 193 EXPORT_SYMBOL(snd_ice1712_akm4xxx_init);
 194 EXPORT_SYMBOL(snd_ice1712_akm4xxx_free);
 195 EXPORT_SYMBOL(snd_ice1712_akm4xxx_build_controls);