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Linux/sound/pci/ice1712/ak4xxx.c

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  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 <linux/io.h>
 25 #include <linux/delay.h>
 26 #include <linux/interrupt.h>
 27 #include <linux/slab.h>
 28 #include <linux/init.h>
 29 #include <linux/module.h>
 30 #include <sound/core.h>
 31 #include <sound/initval.h>
 32 #include "ice1712.h"
 33 
 34 MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
 35 MODULE_DESCRIPTION("ICEnsemble ICE17xx <-> AK4xxx AD/DA chip interface");
 36 MODULE_LICENSE("GPL");
 37 
 38 static void snd_ice1712_akm4xxx_lock(struct snd_akm4xxx *ak, int chip)
 39 {
 40         struct snd_ice1712 *ice = ak->private_data[0];
 41 
 42         snd_ice1712_save_gpio_status(ice);
 43 }
 44 
 45 static void snd_ice1712_akm4xxx_unlock(struct snd_akm4xxx *ak, int chip)
 46 {
 47         struct snd_ice1712 *ice = ak->private_data[0];
 48 
 49         snd_ice1712_restore_gpio_status(ice);
 50 }
 51 
 52 /*
 53  * write AK4xxx register
 54  */
 55 static void snd_ice1712_akm4xxx_write(struct snd_akm4xxx *ak, int chip,
 56                                       unsigned char addr, unsigned char data)
 57 {
 58         unsigned int tmp;
 59         int idx;
 60         unsigned int addrdata;
 61         struct snd_ak4xxx_private *priv = (void *)ak->private_value[0];
 62         struct snd_ice1712 *ice = ak->private_data[0];
 63 
 64         if (snd_BUG_ON(chip < 0 || chip >= 4))
 65                 return;
 66 
 67         tmp = snd_ice1712_gpio_read(ice);
 68         tmp |= priv->add_flags;
 69         tmp &= ~priv->mask_flags;
 70         if (priv->cs_mask == priv->cs_addr) {
 71                 if (priv->cif) {
 72                         tmp |= priv->cs_mask; /* start without chip select */
 73                 }  else {
 74                         tmp &= ~priv->cs_mask; /* chip select low */
 75                         snd_ice1712_gpio_write(ice, tmp);
 76                         udelay(1);
 77                 }
 78         } else {
 79                 /* doesn't handle cf=1 yet */
 80                 tmp &= ~priv->cs_mask;
 81                 tmp |= priv->cs_addr;
 82                 snd_ice1712_gpio_write(ice, tmp);
 83                 udelay(1);
 84         }
 85 
 86         /* build I2C address + data byte */
 87         addrdata = (priv->caddr << 6) | 0x20 | (addr & 0x1f);
 88         addrdata = (addrdata << 8) | data;
 89         for (idx = 15; idx >= 0; idx--) {
 90                 /* drop clock */
 91                 tmp &= ~priv->clk_mask;
 92                 snd_ice1712_gpio_write(ice, tmp);
 93                 udelay(1);
 94                 /* set data */
 95                 if (addrdata & (1 << idx))
 96                         tmp |= priv->data_mask;
 97                 else
 98                         tmp &= ~priv->data_mask;
 99                 snd_ice1712_gpio_write(ice, tmp);
100                 udelay(1);
101                 /* raise clock */
102                 tmp |= priv->clk_mask;
103                 snd_ice1712_gpio_write(ice, tmp);
104                 udelay(1);
105         }
106 
107         if (priv->cs_mask == priv->cs_addr) {
108                 if (priv->cif) {
109                         /* assert a cs pulse to trigger */
110                         tmp &= ~priv->cs_mask;
111                         snd_ice1712_gpio_write(ice, tmp);
112                         udelay(1);
113                 }
114                 tmp |= priv->cs_mask; /* chip select high to trigger */
115         } else {
116                 tmp &= ~priv->cs_mask;
117                 tmp |= priv->cs_none; /* deselect address */
118         }
119         snd_ice1712_gpio_write(ice, tmp);
120         udelay(1);
121 }
122 
123 /*
124  * initialize the struct snd_akm4xxx record with the template
125  */
126 int snd_ice1712_akm4xxx_init(struct snd_akm4xxx *ak, const struct snd_akm4xxx *temp,
127                              const struct snd_ak4xxx_private *_priv, struct snd_ice1712 *ice)
128 {
129         struct snd_ak4xxx_private *priv;
130 
131         if (_priv != NULL) {
132                 priv = kmalloc(sizeof(*priv), GFP_KERNEL);
133                 if (priv == NULL)
134                         return -ENOMEM;
135                 *priv = *_priv;
136         } else {
137                 priv = NULL;
138         }
139         *ak = *temp;
140         ak->card = ice->card;
141         ak->private_value[0] = (unsigned long)priv;
142         ak->private_data[0] = ice;
143         if (ak->ops.lock == NULL)
144                 ak->ops.lock = snd_ice1712_akm4xxx_lock;
145         if (ak->ops.unlock == NULL)
146                 ak->ops.unlock = snd_ice1712_akm4xxx_unlock;
147         if (ak->ops.write == NULL)
148                 ak->ops.write = snd_ice1712_akm4xxx_write;
149         snd_akm4xxx_init(ak);
150         return 0;
151 }
152 
153 void snd_ice1712_akm4xxx_free(struct snd_ice1712 *ice)
154 {
155         unsigned int akidx;
156         if (ice->akm == NULL)
157                 return;
158         for (akidx = 0; akidx < ice->akm_codecs; akidx++) {
159                 struct snd_akm4xxx *ak = &ice->akm[akidx];
160                 kfree((void*)ak->private_value[0]);
161         }
162         kfree(ice->akm);
163 }
164 
165 /*
166  * build AK4xxx controls
167  */
168 int snd_ice1712_akm4xxx_build_controls(struct snd_ice1712 *ice)
169 {
170         unsigned int akidx;
171         int err;
172 
173         for (akidx = 0; akidx < ice->akm_codecs; akidx++) {
174                 struct snd_akm4xxx *ak = &ice->akm[akidx];
175                 err = snd_akm4xxx_build_controls(ak);
176                 if (err < 0)
177                         return err;
178         }
179         return 0;
180 }
181 
182 static int __init alsa_ice1712_akm4xxx_module_init(void)
183 {
184         return 0;
185 }
186         
187 static void __exit alsa_ice1712_akm4xxx_module_exit(void)
188 {
189 }
190         
191 module_init(alsa_ice1712_akm4xxx_module_init)
192 module_exit(alsa_ice1712_akm4xxx_module_exit)
193 
194 EXPORT_SYMBOL(snd_ice1712_akm4xxx_init);
195 EXPORT_SYMBOL(snd_ice1712_akm4xxx_free);
196 EXPORT_SYMBOL(snd_ice1712_akm4xxx_build_controls);
197 

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