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 #ifndef i2c_device_name 37 #define i2c_device_name(x) ((x)->name) 38 #endif 39 40 static int keywest_probe(struct i2c_client *client, 41 const struct i2c_device_id *id) 42 { 43 i2c_set_clientdata(client, keywest_ctx); 44 return 0; 45 } 46 47 /* 48 * This is kind of a hack, best would be to turn powermac to fixed i2c 49 * bus numbers and declare the sound device as part of platform 50 * initialization 51 */ 52 static int keywest_attach_adapter(struct i2c_adapter *adapter) 53 { 54 struct i2c_board_info info; 55 56 if (! keywest_ctx) 57 return -EINVAL; 58 59 if (strncmp(i2c_device_name(adapter), "mac-io", 6)) 60 return 0; /* ignored */ 61 62 memset(&info, 0, sizeof(struct i2c_board_info)); 63 strlcpy(info.type, "keywest", I2C_NAME_SIZE); 64 info.addr = keywest_ctx->addr; 65 keywest_ctx->client = i2c_new_device(adapter, &info); 66 67 /* 68 * Let i2c-core delete that device on driver removal. 69 * This is safe because i2c-core holds the core_lock mutex for us. 70 */ 71 list_add_tail(&keywest_ctx->client->detected, 72 &keywest_ctx->client->driver->clients); 73 return 0; 74 } 75 76 static int keywest_remove(struct i2c_client *client) 77 { 78 i2c_set_clientdata(client, NULL); 79 if (! keywest_ctx) 80 return 0; 81 if (client == keywest_ctx->client) 82 keywest_ctx->client = NULL; 83 84 return 0; 85 } 86 87 88 static const struct i2c_device_id keywest_i2c_id[] = { 89 { "keywest", 0 }, 90 { } 91 }; 92 93 struct i2c_driver keywest_driver = { 94 .driver = { 95 .name = "PMac Keywest Audio", 96 }, 97 .attach_adapter = keywest_attach_adapter, 98 .probe = keywest_probe, 99 .remove = keywest_remove, 100 .id_table = keywest_i2c_id, 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