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 <linux/init.h> 231da177e4SLinus Torvalds #include <linux/i2c.h> 241da177e4SLinus Torvalds #include <linux/delay.h> 251da177e4SLinus Torvalds #include <linux/slab.h> 261da177e4SLinus Torvalds #include <sound/core.h> 271da177e4SLinus Torvalds #include "pmac.h" 281da177e4SLinus Torvalds 291da177e4SLinus Torvalds /* 301da177e4SLinus Torvalds * we have to keep a static variable here since i2c attach_adapter 311da177e4SLinus Torvalds * callback cannot pass a private data. 321da177e4SLinus Torvalds */ 3365b29f50STakashi Iwai static struct pmac_keywest *keywest_ctx; 341da177e4SLinus Torvalds 351da177e4SLinus Torvalds 365de4155bSJean Delvare static int keywest_probe(struct i2c_client *client, 375de4155bSJean Delvare const struct i2c_device_id *id) 385de4155bSJean Delvare { 395de4155bSJean Delvare i2c_set_clientdata(client, keywest_ctx); 405de4155bSJean Delvare return 0; 415de4155bSJean Delvare } 425de4155bSJean Delvare 435de4155bSJean Delvare /* 445de4155bSJean Delvare * This is kind of a hack, best would be to turn powermac to fixed i2c 455de4155bSJean Delvare * bus numbers and declare the sound device as part of platform 465de4155bSJean Delvare * initialization 475de4155bSJean Delvare */ 481da177e4SLinus Torvalds static int keywest_attach_adapter(struct i2c_adapter *adapter) 491da177e4SLinus Torvalds { 505de4155bSJean Delvare struct i2c_board_info info; 511da177e4SLinus Torvalds 521da177e4SLinus Torvalds if (! keywest_ctx) 531da177e4SLinus Torvalds return -EINVAL; 541da177e4SLinus Torvalds 55903dba1eSJean Delvare if (strncmp(adapter->name, "mac-io", 6)) 561da177e4SLinus Torvalds return 0; /* ignored */ 571da177e4SLinus Torvalds 585de4155bSJean Delvare memset(&info, 0, sizeof(struct i2c_board_info)); 595de4155bSJean Delvare strlcpy(info.type, "keywest", I2C_NAME_SIZE); 605de4155bSJean Delvare info.addr = keywest_ctx->addr; 615de4155bSJean Delvare keywest_ctx->client = i2c_new_device(adapter, &info); 6218c40784STakashi Iwai if (!keywest_ctx->client) 6318c40784STakashi Iwai return -ENODEV; 6418c40784STakashi Iwai /* 6518c40784STakashi Iwai * We know the driver is already loaded, so the device should be 6618c40784STakashi Iwai * already bound. If not it means binding failed, and then there 6718c40784STakashi Iwai * is no point in keeping the device instantiated. 6818c40784STakashi Iwai */ 6918c40784STakashi Iwai if (!keywest_ctx->client->driver) { 7018c40784STakashi Iwai i2c_unregister_device(keywest_ctx->client); 7118c40784STakashi Iwai keywest_ctx->client = NULL; 7218c40784STakashi Iwai return -ENODEV; 7318c40784STakashi Iwai } 741da177e4SLinus Torvalds 755de4155bSJean Delvare /* 765de4155bSJean Delvare * Let i2c-core delete that device on driver removal. 775de4155bSJean Delvare * This is safe because i2c-core holds the core_lock mutex for us. 785de4155bSJean Delvare */ 795de4155bSJean Delvare list_add_tail(&keywest_ctx->client->detected, 805de4155bSJean Delvare &keywest_ctx->client->driver->clients); 811da177e4SLinus Torvalds return 0; 821da177e4SLinus Torvalds } 831da177e4SLinus Torvalds 845de4155bSJean Delvare static int keywest_remove(struct i2c_client *client) 851da177e4SLinus Torvalds { 865de4155bSJean Delvare i2c_set_clientdata(client, NULL); 871da177e4SLinus Torvalds if (! keywest_ctx) 881da177e4SLinus Torvalds return 0; 891da177e4SLinus Torvalds if (client == keywest_ctx->client) 901da177e4SLinus Torvalds keywest_ctx->client = NULL; 911da177e4SLinus Torvalds 921da177e4SLinus Torvalds return 0; 931da177e4SLinus Torvalds } 941da177e4SLinus Torvalds 955de4155bSJean Delvare 965de4155bSJean Delvare static const struct i2c_device_id keywest_i2c_id[] = { 975de4155bSJean Delvare { "keywest", 0 }, 985de4155bSJean Delvare { } 995de4155bSJean Delvare }; 1005de4155bSJean Delvare 101a656cbf0SJean Delvare static struct i2c_driver keywest_driver = { 1025de4155bSJean Delvare .driver = { 1035de4155bSJean Delvare .name = "PMac Keywest Audio", 1045de4155bSJean Delvare }, 1055de4155bSJean Delvare .attach_adapter = keywest_attach_adapter, 1065de4155bSJean Delvare .probe = keywest_probe, 1075de4155bSJean Delvare .remove = keywest_remove, 1085de4155bSJean Delvare .id_table = keywest_i2c_id, 1095de4155bSJean Delvare }; 1105de4155bSJean Delvare 1111da177e4SLinus Torvalds /* exported */ 11265b29f50STakashi Iwai void snd_pmac_keywest_cleanup(struct pmac_keywest *i2c) 1131da177e4SLinus Torvalds { 1141da177e4SLinus Torvalds if (keywest_ctx && keywest_ctx == i2c) { 1151da177e4SLinus Torvalds i2c_del_driver(&keywest_driver); 1161da177e4SLinus Torvalds keywest_ctx = NULL; 1171da177e4SLinus Torvalds } 1181da177e4SLinus Torvalds } 1191da177e4SLinus Torvalds 1205c9b6e9eSStephen Rothwell int __devinit snd_pmac_tumbler_post_init(void) 1211da177e4SLinus Torvalds { 1221da177e4SLinus Torvalds int err; 1231da177e4SLinus Torvalds 124783eaf46STakashi Iwai if (!keywest_ctx || !keywest_ctx->client) 125783eaf46STakashi Iwai return -ENXIO; 126783eaf46STakashi Iwai 1271da177e4SLinus Torvalds if ((err = keywest_ctx->init_client(keywest_ctx)) < 0) { 1281da177e4SLinus Torvalds snd_printk(KERN_ERR "tumbler: %i :cannot initialize the MCS\n", err); 1291da177e4SLinus Torvalds return err; 1301da177e4SLinus Torvalds } 1311da177e4SLinus Torvalds return 0; 1321da177e4SLinus Torvalds } 1331da177e4SLinus Torvalds 1341da177e4SLinus Torvalds /* exported */ 1355c9b6e9eSStephen Rothwell int __devinit snd_pmac_keywest_init(struct pmac_keywest *i2c) 1361da177e4SLinus Torvalds { 1371da177e4SLinus Torvalds int err; 1381da177e4SLinus Torvalds 1391da177e4SLinus Torvalds if (keywest_ctx) 1401da177e4SLinus Torvalds return -EBUSY; 1411da177e4SLinus Torvalds 1421da177e4SLinus Torvalds keywest_ctx = i2c; 1431da177e4SLinus Torvalds 1441da177e4SLinus Torvalds if ((err = i2c_add_driver(&keywest_driver))) { 1451da177e4SLinus Torvalds snd_printk(KERN_ERR "cannot register keywest i2c driver\n"); 1461da177e4SLinus Torvalds return err; 1471da177e4SLinus Torvalds } 1481da177e4SLinus Torvalds return 0; 1491da177e4SLinus Torvalds } 150