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/slab.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 36 static int keywest_attach_adapter(struct i2c_adapter *adapter); 37 static int keywest_detach_client(struct i2c_client *client); 38 39 struct i2c_driver keywest_driver = { 40 .driver = { 41 .name = "PMac Keywest Audio", 42 }, 43 .attach_adapter = &keywest_attach_adapter, 44 .detach_client = &keywest_detach_client, 45 }; 46 47 48 #ifndef i2c_device_name 49 #define i2c_device_name(x) ((x)->name) 50 #endif 51 52 static int keywest_attach_adapter(struct i2c_adapter *adapter) 53 { 54 int err; 55 struct i2c_client *new_client; 56 57 if (! keywest_ctx) 58 return -EINVAL; 59 60 if (strncmp(i2c_device_name(adapter), "mac-io", 6)) 61 return 0; /* ignored */ 62 63 new_client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL); 64 if (! new_client) 65 return -ENOMEM; 66 67 new_client->addr = keywest_ctx->addr; 68 i2c_set_clientdata(new_client, keywest_ctx); 69 new_client->adapter = adapter; 70 new_client->driver = &keywest_driver; 71 new_client->flags = 0; 72 73 strcpy(i2c_device_name(new_client), keywest_ctx->name); 74 keywest_ctx->client = new_client; 75 76 /* Tell the i2c layer a new client has arrived */ 77 if (i2c_attach_client(new_client)) { 78 snd_printk(KERN_ERR "tumbler: cannot attach i2c client\n"); 79 err = -ENODEV; 80 goto __err; 81 } 82 83 return 0; 84 85 __err: 86 kfree(new_client); 87 keywest_ctx->client = NULL; 88 return err; 89 } 90 91 static int keywest_detach_client(struct i2c_client *client) 92 { 93 if (! keywest_ctx) 94 return 0; 95 if (client == keywest_ctx->client) 96 keywest_ctx->client = NULL; 97 98 i2c_detach_client(client); 99 kfree(client); 100 return 0; 101 } 102 103 /* exported */ 104 void snd_pmac_keywest_cleanup(struct pmac_keywest *i2c) 105 { 106 if (keywest_ctx && keywest_ctx == i2c) { 107 i2c_del_driver(&keywest_driver); 108 keywest_ctx = NULL; 109 } 110 } 111 112 int __init snd_pmac_tumbler_post_init(void) 113 { 114 int err; 115 116 if (!keywest_ctx || !keywest_ctx->client) 117 return -ENXIO; 118 119 if ((err = keywest_ctx->init_client(keywest_ctx)) < 0) { 120 snd_printk(KERN_ERR "tumbler: %i :cannot initialize the MCS\n", err); 121 return err; 122 } 123 return 0; 124 } 125 126 /* exported */ 127 int __init snd_pmac_keywest_init(struct pmac_keywest *i2c) 128 { 129 int err; 130 131 if (keywest_ctx) 132 return -EBUSY; 133 134 keywest_ctx = i2c; 135 136 if ((err = i2c_add_driver(&keywest_driver))) { 137 snd_printk(KERN_ERR "cannot register keywest i2c driver\n"); 138 return err; 139 } 140 return 0; 141 } 142