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> 25654e2751STakashi Iwai #include <linux/module.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 3528760c19SWolfram Sang static bool keywest_probed; 361da177e4SLinus Torvalds 375de4155bSJean Delvare static int keywest_probe(struct i2c_client *client, 385de4155bSJean Delvare const struct i2c_device_id *id) 395de4155bSJean Delvare { 4028760c19SWolfram Sang keywest_probed = true; 4128760c19SWolfram Sang /* If instantiated via i2c-powermac, we still need to set the client */ 4228760c19SWolfram Sang if (!keywest_ctx->client) 4328760c19SWolfram Sang keywest_ctx->client = client; 445de4155bSJean Delvare i2c_set_clientdata(client, keywest_ctx); 455de4155bSJean Delvare return 0; 465de4155bSJean Delvare } 475de4155bSJean Delvare 485de4155bSJean Delvare /* 495de4155bSJean Delvare * This is kind of a hack, best would be to turn powermac to fixed i2c 505de4155bSJean Delvare * bus numbers and declare the sound device as part of platform 515de4155bSJean Delvare * initialization 525de4155bSJean Delvare */ 531da177e4SLinus Torvalds static int keywest_attach_adapter(struct i2c_adapter *adapter) 541da177e4SLinus Torvalds { 555de4155bSJean Delvare struct i2c_board_info info; 561da177e4SLinus Torvalds 571da177e4SLinus Torvalds if (! keywest_ctx) 581da177e4SLinus Torvalds return -EINVAL; 591da177e4SLinus Torvalds 60903dba1eSJean Delvare if (strncmp(adapter->name, "mac-io", 6)) 61ac397c80SWolfram Sang return -EINVAL; /* ignored */ 621da177e4SLinus Torvalds 635de4155bSJean Delvare memset(&info, 0, sizeof(struct i2c_board_info)); 645de4155bSJean Delvare strlcpy(info.type, "keywest", I2C_NAME_SIZE); 655de4155bSJean Delvare info.addr = keywest_ctx->addr; 665de4155bSJean Delvare keywest_ctx->client = i2c_new_device(adapter, &info); 6718c40784STakashi Iwai if (!keywest_ctx->client) 6818c40784STakashi Iwai return -ENODEV; 6918c40784STakashi Iwai /* 7018c40784STakashi Iwai * We know the driver is already loaded, so the device should be 7118c40784STakashi Iwai * already bound. If not it means binding failed, and then there 7218c40784STakashi Iwai * is no point in keeping the device instantiated. 7318c40784STakashi Iwai */ 74a7cde6d2SLars-Peter Clausen if (!keywest_ctx->client->dev.driver) { 7518c40784STakashi Iwai i2c_unregister_device(keywest_ctx->client); 7618c40784STakashi Iwai keywest_ctx->client = NULL; 7718c40784STakashi Iwai return -ENODEV; 7818c40784STakashi Iwai } 791da177e4SLinus Torvalds 805de4155bSJean Delvare /* 815de4155bSJean Delvare * Let i2c-core delete that device on driver removal. 825de4155bSJean Delvare * This is safe because i2c-core holds the core_lock mutex for us. 835de4155bSJean Delvare */ 845de4155bSJean Delvare list_add_tail(&keywest_ctx->client->detected, 85a7cde6d2SLars-Peter Clausen &to_i2c_driver(keywest_ctx->client->dev.driver)->clients); 861da177e4SLinus Torvalds return 0; 871da177e4SLinus Torvalds } 881da177e4SLinus Torvalds 895de4155bSJean Delvare static int keywest_remove(struct i2c_client *client) 901da177e4SLinus Torvalds { 911da177e4SLinus Torvalds if (! keywest_ctx) 921da177e4SLinus Torvalds return 0; 931da177e4SLinus Torvalds if (client == keywest_ctx->client) 941da177e4SLinus Torvalds keywest_ctx->client = NULL; 951da177e4SLinus Torvalds 961da177e4SLinus Torvalds return 0; 971da177e4SLinus Torvalds } 981da177e4SLinus Torvalds 995de4155bSJean Delvare 1005de4155bSJean Delvare static const struct i2c_device_id keywest_i2c_id[] = { 10128760c19SWolfram Sang { "MAC,tas3004", 0 }, /* instantiated by i2c-powermac */ 10228760c19SWolfram Sang { "keywest", 0 }, /* instantiated by us if needed */ 1035de4155bSJean Delvare { } 1045de4155bSJean Delvare }; 105a2bc2af6SJavier Martinez Canillas MODULE_DEVICE_TABLE(i2c, keywest_i2c_id); 1065de4155bSJean Delvare 107a656cbf0SJean Delvare static struct i2c_driver keywest_driver = { 1085de4155bSJean Delvare .driver = { 1095de4155bSJean Delvare .name = "PMac Keywest Audio", 1105de4155bSJean Delvare }, 1115de4155bSJean Delvare .probe = keywest_probe, 1125de4155bSJean Delvare .remove = keywest_remove, 1135de4155bSJean Delvare .id_table = keywest_i2c_id, 1145de4155bSJean Delvare }; 1155de4155bSJean Delvare 1161da177e4SLinus Torvalds /* exported */ 11765b29f50STakashi Iwai void snd_pmac_keywest_cleanup(struct pmac_keywest *i2c) 1181da177e4SLinus Torvalds { 1191da177e4SLinus Torvalds if (keywest_ctx && keywest_ctx == i2c) { 1201da177e4SLinus Torvalds i2c_del_driver(&keywest_driver); 1211da177e4SLinus Torvalds keywest_ctx = NULL; 1221da177e4SLinus Torvalds } 1231da177e4SLinus Torvalds } 1241da177e4SLinus Torvalds 12515afafc2SBill Pemberton int snd_pmac_tumbler_post_init(void) 1261da177e4SLinus Torvalds { 1271da177e4SLinus Torvalds int err; 1281da177e4SLinus Torvalds 129783eaf46STakashi Iwai if (!keywest_ctx || !keywest_ctx->client) 130783eaf46STakashi Iwai return -ENXIO; 131783eaf46STakashi Iwai 1321da177e4SLinus Torvalds if ((err = keywest_ctx->init_client(keywest_ctx)) < 0) { 1331da177e4SLinus Torvalds snd_printk(KERN_ERR "tumbler: %i :cannot initialize the MCS\n", err); 1341da177e4SLinus Torvalds return err; 1351da177e4SLinus Torvalds } 1361da177e4SLinus Torvalds return 0; 1371da177e4SLinus Torvalds } 1381da177e4SLinus Torvalds 1391da177e4SLinus Torvalds /* exported */ 14015afafc2SBill Pemberton int snd_pmac_keywest_init(struct pmac_keywest *i2c) 1411da177e4SLinus Torvalds { 142ac397c80SWolfram Sang struct i2c_adapter *adap; 143ac397c80SWolfram Sang int err, i = 0; 1441da177e4SLinus Torvalds 1451da177e4SLinus Torvalds if (keywest_ctx) 1461da177e4SLinus Torvalds return -EBUSY; 1471da177e4SLinus Torvalds 148ac397c80SWolfram Sang adap = i2c_get_adapter(0); 149ac397c80SWolfram Sang if (!adap) 150ac397c80SWolfram Sang return -EPROBE_DEFER; 151ac397c80SWolfram Sang 1521da177e4SLinus Torvalds keywest_ctx = i2c; 1531da177e4SLinus Torvalds 1541da177e4SLinus Torvalds if ((err = i2c_add_driver(&keywest_driver))) { 1551da177e4SLinus Torvalds snd_printk(KERN_ERR "cannot register keywest i2c driver\n"); 156ac397c80SWolfram Sang i2c_put_adapter(adap); 1571da177e4SLinus Torvalds return err; 1581da177e4SLinus Torvalds } 159ac397c80SWolfram Sang 16028760c19SWolfram Sang /* There was already a device from i2c-powermac. Great, let's return */ 16128760c19SWolfram Sang if (keywest_probed) 16228760c19SWolfram Sang return 0; 16328760c19SWolfram Sang 164ac397c80SWolfram Sang /* We assume Macs have consecutive I2C bus numbers starting at 0 */ 165ac397c80SWolfram Sang while (adap) { 16628760c19SWolfram Sang /* Scan for devices to be bound to */ 167ac397c80SWolfram Sang err = keywest_attach_adapter(adap); 168ac397c80SWolfram Sang if (!err) 1691da177e4SLinus Torvalds return 0; 170ac397c80SWolfram Sang i2c_put_adapter(adap); 171ac397c80SWolfram Sang adap = i2c_get_adapter(++i); 172ac397c80SWolfram Sang } 173ac397c80SWolfram Sang 174ac397c80SWolfram Sang return -ENODEV; 1751da177e4SLinus Torvalds } 176