11da177e4SLinus Torvalds /* 21da177e4SLinus Torvalds * common keywest i2c layer 31da177e4SLinus Torvalds * 41da177e4SLinus Torvalds * Copyright (c) by Takashi Iwai <tiwai@suse.de> 51da177e4SLinus Torvalds * 61da177e4SLinus Torvalds * This program is free software; you can redistribute it and/or modify 71da177e4SLinus Torvalds * it under the terms of the GNU General Public License as published by 81da177e4SLinus Torvalds * the Free Software Foundation; either version 2 of the License, or 91da177e4SLinus Torvalds * (at your option) any later version. 101da177e4SLinus Torvalds * 111da177e4SLinus Torvalds * This program is distributed in the hope that it will be useful, 121da177e4SLinus Torvalds * but WITHOUT ANY WARRANTY; without even the implied warranty of 131da177e4SLinus Torvalds * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 141da177e4SLinus Torvalds * GNU General Public License for more details. 151da177e4SLinus Torvalds * 161da177e4SLinus Torvalds * You should have received a copy of the GNU General Public License 171da177e4SLinus Torvalds * along with this program; if not, write to the Free Software 181da177e4SLinus Torvalds * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 191da177e4SLinus Torvalds */ 201da177e4SLinus Torvalds 211da177e4SLinus Torvalds 221da177e4SLinus Torvalds #include <sound/driver.h> 231da177e4SLinus Torvalds #include <linux/init.h> 241da177e4SLinus Torvalds #include <linux/i2c.h> 251da177e4SLinus Torvalds #include <linux/delay.h> 261da177e4SLinus Torvalds #include <linux/i2c-dev.h> 271da177e4SLinus Torvalds #include <linux/slab.h> 281da177e4SLinus Torvalds #include <sound/core.h> 291da177e4SLinus Torvalds #include "pmac.h" 301da177e4SLinus Torvalds 311da177e4SLinus Torvalds /* 321da177e4SLinus Torvalds * we have to keep a static variable here since i2c attach_adapter 331da177e4SLinus Torvalds * callback cannot pass a private data. 341da177e4SLinus Torvalds */ 3565b29f50STakashi Iwai static struct pmac_keywest *keywest_ctx; 361da177e4SLinus Torvalds 371da177e4SLinus Torvalds 381da177e4SLinus Torvalds #define I2C_DRIVERID_KEYWEST 0xFEBA 391da177e4SLinus Torvalds 401da177e4SLinus Torvalds static int keywest_attach_adapter(struct i2c_adapter *adapter); 411da177e4SLinus Torvalds static int keywest_detach_client(struct i2c_client *client); 421da177e4SLinus Torvalds 431da177e4SLinus Torvalds struct i2c_driver keywest_driver = { 441da177e4SLinus Torvalds .name = "PMac Keywest Audio", 451da177e4SLinus Torvalds .id = I2C_DRIVERID_KEYWEST, 461da177e4SLinus Torvalds .flags = I2C_DF_NOTIFY, 471da177e4SLinus Torvalds .attach_adapter = &keywest_attach_adapter, 481da177e4SLinus Torvalds .detach_client = &keywest_detach_client, 491da177e4SLinus Torvalds }; 501da177e4SLinus Torvalds 511da177e4SLinus Torvalds 521da177e4SLinus Torvalds #ifndef i2c_device_name 531da177e4SLinus Torvalds #define i2c_device_name(x) ((x)->name) 541da177e4SLinus Torvalds #endif 551da177e4SLinus Torvalds 561da177e4SLinus Torvalds static int keywest_attach_adapter(struct i2c_adapter *adapter) 571da177e4SLinus Torvalds { 581da177e4SLinus Torvalds int err; 591da177e4SLinus Torvalds struct i2c_client *new_client; 601da177e4SLinus Torvalds 611da177e4SLinus Torvalds if (! keywest_ctx) 621da177e4SLinus Torvalds return -EINVAL; 631da177e4SLinus Torvalds 641da177e4SLinus Torvalds if (strncmp(i2c_device_name(adapter), "mac-io", 6)) 651da177e4SLinus Torvalds return 0; /* ignored */ 661da177e4SLinus Torvalds 671da177e4SLinus Torvalds new_client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL); 681da177e4SLinus Torvalds if (! new_client) 691da177e4SLinus Torvalds return -ENOMEM; 701da177e4SLinus Torvalds 711da177e4SLinus Torvalds memset(new_client, 0, sizeof(*new_client)); 721da177e4SLinus Torvalds new_client->addr = keywest_ctx->addr; 731da177e4SLinus Torvalds i2c_set_clientdata(new_client, keywest_ctx); 741da177e4SLinus Torvalds new_client->adapter = adapter; 751da177e4SLinus Torvalds new_client->driver = &keywest_driver; 761da177e4SLinus Torvalds new_client->flags = 0; 771da177e4SLinus Torvalds 781da177e4SLinus Torvalds strcpy(i2c_device_name(new_client), keywest_ctx->name); 791da177e4SLinus Torvalds keywest_ctx->client = new_client; 801da177e4SLinus Torvalds 811da177e4SLinus Torvalds /* Tell the i2c layer a new client has arrived */ 821da177e4SLinus Torvalds if (i2c_attach_client(new_client)) { 831da177e4SLinus Torvalds snd_printk(KERN_ERR "tumbler: cannot attach i2c client\n"); 841da177e4SLinus Torvalds err = -ENODEV; 851da177e4SLinus Torvalds goto __err; 861da177e4SLinus Torvalds } 871da177e4SLinus Torvalds 881da177e4SLinus Torvalds return 0; 891da177e4SLinus Torvalds 901da177e4SLinus Torvalds __err: 911da177e4SLinus Torvalds kfree(new_client); 921da177e4SLinus Torvalds keywest_ctx->client = NULL; 931da177e4SLinus Torvalds return err; 941da177e4SLinus Torvalds } 951da177e4SLinus Torvalds 961da177e4SLinus Torvalds static int keywest_detach_client(struct i2c_client *client) 971da177e4SLinus Torvalds { 981da177e4SLinus Torvalds if (! keywest_ctx) 991da177e4SLinus Torvalds return 0; 1001da177e4SLinus Torvalds if (client == keywest_ctx->client) 1011da177e4SLinus Torvalds keywest_ctx->client = NULL; 1021da177e4SLinus Torvalds 1031da177e4SLinus Torvalds i2c_detach_client(client); 1041da177e4SLinus Torvalds kfree(client); 1051da177e4SLinus Torvalds return 0; 1061da177e4SLinus Torvalds } 1071da177e4SLinus Torvalds 1081da177e4SLinus Torvalds /* exported */ 10965b29f50STakashi Iwai void snd_pmac_keywest_cleanup(struct pmac_keywest *i2c) 1101da177e4SLinus Torvalds { 1111da177e4SLinus Torvalds if (keywest_ctx && keywest_ctx == i2c) { 1121da177e4SLinus Torvalds i2c_del_driver(&keywest_driver); 1131da177e4SLinus Torvalds keywest_ctx = NULL; 1141da177e4SLinus Torvalds } 1151da177e4SLinus Torvalds } 1161da177e4SLinus Torvalds 1171da177e4SLinus Torvalds int __init snd_pmac_tumbler_post_init(void) 1181da177e4SLinus Torvalds { 1191da177e4SLinus Torvalds int err; 1201da177e4SLinus Torvalds 1211da177e4SLinus Torvalds if ((err = keywest_ctx->init_client(keywest_ctx)) < 0) { 1221da177e4SLinus Torvalds snd_printk(KERN_ERR "tumbler: %i :cannot initialize the MCS\n", err); 1231da177e4SLinus Torvalds return err; 1241da177e4SLinus Torvalds } 1251da177e4SLinus Torvalds return 0; 1261da177e4SLinus Torvalds } 1271da177e4SLinus Torvalds 1281da177e4SLinus Torvalds /* exported */ 12965b29f50STakashi Iwai int __init snd_pmac_keywest_init(struct pmac_keywest *i2c) 1301da177e4SLinus Torvalds { 1311da177e4SLinus Torvalds int err; 1321da177e4SLinus Torvalds 1331da177e4SLinus Torvalds if (keywest_ctx) 1341da177e4SLinus Torvalds return -EBUSY; 1351da177e4SLinus Torvalds 1361da177e4SLinus Torvalds keywest_ctx = i2c; 1371da177e4SLinus Torvalds 1381da177e4SLinus Torvalds if ((err = i2c_add_driver(&keywest_driver))) { 1391da177e4SLinus Torvalds snd_printk(KERN_ERR "cannot register keywest i2c driver\n"); 1401da177e4SLinus Torvalds return err; 1411da177e4SLinus Torvalds } 1421da177e4SLinus Torvalds return 0; 1431da177e4SLinus Torvalds } 144