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Linux/sound/ppc/keywest.c

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  1 /*
  2  * common keywest i2c layer
  3  *
  4  * Copyright (c) by Takashi Iwai <tiwai@suse.de>
  5  *
  6  *   This program is free software; you can redistribute it and/or modify
  7  *   it under the terms of the GNU General Public License as published by
  8  *   the Free Software Foundation; either version 2 of the License, or
  9  *   (at your option) any later version.
 10  *
 11  *   This program is distributed in the hope that it will be useful,
 12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 14  *   GNU General Public License for more details.
 15  *
 16  *   You should have received a copy of the GNU General Public License
 17  *   along with this program; if not, write to the Free Software
 18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 19  */
 20 
 21 
 22 #include <linux/init.h>
 23 #include <linux/i2c.h>
 24 #include <linux/delay.h>
 25 #include <linux/module.h>
 26 #include <sound/core.h>
 27 #include "pmac.h"
 28 
 29 /*
 30  * we have to keep a static variable here since i2c attach_adapter
 31  * callback cannot pass a private data.
 32  */
 33 static struct pmac_keywest *keywest_ctx;
 34 
 35 static bool keywest_probed;
 36 
 37 static int keywest_probe(struct i2c_client *client,
 38                          const struct i2c_device_id *id)
 39 {
 40         keywest_probed = true;
 41         /* If instantiated via i2c-powermac, we still need to set the client */
 42         if (!keywest_ctx->client)
 43                 keywest_ctx->client = client;
 44         i2c_set_clientdata(client, keywest_ctx);
 45         return 0;
 46 }
 47 
 48 /*
 49  * This is kind of a hack, best would be to turn powermac to fixed i2c
 50  * bus numbers and declare the sound device as part of platform
 51  * initialization
 52  */
 53 static int keywest_attach_adapter(struct i2c_adapter *adapter)
 54 {
 55         struct i2c_board_info info;
 56 
 57         if (! keywest_ctx)
 58                 return -EINVAL;
 59 
 60         if (strncmp(adapter->name, "mac-io", 6))
 61                 return -EINVAL; /* ignored */
 62 
 63         memset(&info, 0, sizeof(struct i2c_board_info));
 64         strlcpy(info.type, "keywest", I2C_NAME_SIZE);
 65         info.addr = keywest_ctx->addr;
 66         keywest_ctx->client = i2c_new_device(adapter, &info);
 67         if (!keywest_ctx->client)
 68                 return -ENODEV;
 69         /*
 70          * We know the driver is already loaded, so the device should be
 71          * already bound. If not it means binding failed, and then there
 72          * is no point in keeping the device instantiated.
 73          */
 74         if (!keywest_ctx->client->dev.driver) {
 75                 i2c_unregister_device(keywest_ctx->client);
 76                 keywest_ctx->client = NULL;
 77                 return -ENODEV;
 78         }
 79         
 80         /*
 81          * Let i2c-core delete that device on driver removal.
 82          * This is safe because i2c-core holds the core_lock mutex for us.
 83          */
 84         list_add_tail(&keywest_ctx->client->detected,
 85                       &to_i2c_driver(keywest_ctx->client->dev.driver)->clients);
 86         return 0;
 87 }
 88 
 89 static int keywest_remove(struct i2c_client *client)
 90 {
 91         if (! keywest_ctx)
 92                 return 0;
 93         if (client == keywest_ctx->client)
 94                 keywest_ctx->client = NULL;
 95 
 96         return 0;
 97 }
 98 
 99 
100 static const struct i2c_device_id keywest_i2c_id[] = {
101         { "MAC,tas3004", 0 },           /* instantiated by i2c-powermac */
102         { "keywest", 0 },               /* instantiated by us if needed */
103         { }
104 };
105 MODULE_DEVICE_TABLE(i2c, keywest_i2c_id);
106 
107 static struct i2c_driver keywest_driver = {
108         .driver = {
109                 .name = "PMac Keywest Audio",
110         },
111         .probe = keywest_probe,
112         .remove = keywest_remove,
113         .id_table = keywest_i2c_id,
114 };
115 
116 /* exported */
117 void snd_pmac_keywest_cleanup(struct pmac_keywest *i2c)
118 {
119         if (keywest_ctx && keywest_ctx == i2c) {
120                 i2c_del_driver(&keywest_driver);
121                 keywest_ctx = NULL;
122         }
123 }
124 
125 int snd_pmac_tumbler_post_init(void)
126 {
127         int err;
128         
129         if (!keywest_ctx || !keywest_ctx->client)
130                 return -ENXIO;
131 
132         if ((err = keywest_ctx->init_client(keywest_ctx)) < 0) {
133                 snd_printk(KERN_ERR "tumbler: %i :cannot initialize the MCS\n", err);
134                 return err;
135         }
136         return 0;
137 }
138 
139 /* exported */
140 int snd_pmac_keywest_init(struct pmac_keywest *i2c)
141 {
142         struct i2c_adapter *adap;
143         int err, i = 0;
144 
145         if (keywest_ctx)
146                 return -EBUSY;
147 
148         adap = i2c_get_adapter(0);
149         if (!adap)
150                 return -EPROBE_DEFER;
151 
152         keywest_ctx = i2c;
153 
154         if ((err = i2c_add_driver(&keywest_driver))) {
155                 snd_printk(KERN_ERR "cannot register keywest i2c driver\n");
156                 i2c_put_adapter(adap);
157                 return err;
158         }
159 
160         /* There was already a device from i2c-powermac. Great, let's return */
161         if (keywest_probed)
162                 return 0;
163 
164         /* We assume Macs have consecutive I2C bus numbers starting at 0 */
165         while (adap) {
166                 /* Scan for devices to be bound to */
167                 err = keywest_attach_adapter(adap);
168                 if (!err)
169                         return 0;
170                 i2c_put_adapter(adap);
171                 adap = i2c_get_adapter(++i);
172         }
173 
174         return -ENODEV;
175 }
176 

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