11a59d1b8SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-or-later 21da177e4SLinus Torvalds /* 31da177e4SLinus Torvalds * common keywest i2c layer 41da177e4SLinus Torvalds * 51da177e4SLinus Torvalds * Copyright (c) by Takashi Iwai <tiwai@suse.de> 61da177e4SLinus Torvalds */ 71da177e4SLinus Torvalds 81da177e4SLinus Torvalds 91da177e4SLinus Torvalds #include <linux/init.h> 101da177e4SLinus Torvalds #include <linux/i2c.h> 111da177e4SLinus Torvalds #include <linux/delay.h> 12654e2751STakashi Iwai #include <linux/module.h> 131da177e4SLinus Torvalds #include <sound/core.h> 141da177e4SLinus Torvalds #include "pmac.h" 151da177e4SLinus Torvalds 1665b29f50STakashi Iwai static struct pmac_keywest *keywest_ctx; 1728760c19SWolfram Sang static bool keywest_probed; 181da177e4SLinus Torvalds 19*1cf47b04SUwe Kleine-König static int keywest_probe(struct i2c_client *client) 205de4155bSJean Delvare { 2128760c19SWolfram Sang keywest_probed = true; 2228760c19SWolfram Sang /* If instantiated via i2c-powermac, we still need to set the client */ 2328760c19SWolfram Sang if (!keywest_ctx->client) 2428760c19SWolfram Sang keywest_ctx->client = client; 255de4155bSJean Delvare i2c_set_clientdata(client, keywest_ctx); 265de4155bSJean Delvare return 0; 275de4155bSJean Delvare } 285de4155bSJean Delvare 295de4155bSJean Delvare /* 305de4155bSJean Delvare * This is kind of a hack, best would be to turn powermac to fixed i2c 315de4155bSJean Delvare * bus numbers and declare the sound device as part of platform 325de4155bSJean Delvare * initialization 335de4155bSJean Delvare */ 341da177e4SLinus Torvalds static int keywest_attach_adapter(struct i2c_adapter *adapter) 351da177e4SLinus Torvalds { 365de4155bSJean Delvare struct i2c_board_info info; 3704a9af2eSWolfram Sang struct i2c_client *client; 381da177e4SLinus Torvalds 391da177e4SLinus Torvalds if (! keywest_ctx) 401da177e4SLinus Torvalds return -EINVAL; 411da177e4SLinus Torvalds 42903dba1eSJean Delvare if (strncmp(adapter->name, "mac-io", 6)) 43ac397c80SWolfram Sang return -EINVAL; /* ignored */ 441da177e4SLinus Torvalds 455de4155bSJean Delvare memset(&info, 0, sizeof(struct i2c_board_info)); 4675b1a8f9SJoe Perches strscpy(info.type, "keywest", I2C_NAME_SIZE); 475de4155bSJean Delvare info.addr = keywest_ctx->addr; 4804a9af2eSWolfram Sang client = i2c_new_client_device(adapter, &info); 4904a9af2eSWolfram Sang if (IS_ERR(client)) 5004a9af2eSWolfram Sang return PTR_ERR(client); 5104a9af2eSWolfram Sang keywest_ctx->client = client; 5204a9af2eSWolfram Sang 5318c40784STakashi Iwai /* 5418c40784STakashi Iwai * We know the driver is already loaded, so the device should be 5518c40784STakashi Iwai * already bound. If not it means binding failed, and then there 5618c40784STakashi Iwai * is no point in keeping the device instantiated. 5718c40784STakashi Iwai */ 58a7cde6d2SLars-Peter Clausen if (!keywest_ctx->client->dev.driver) { 5918c40784STakashi Iwai i2c_unregister_device(keywest_ctx->client); 6018c40784STakashi Iwai keywest_ctx->client = NULL; 6118c40784STakashi Iwai return -ENODEV; 6218c40784STakashi Iwai } 631da177e4SLinus Torvalds 645de4155bSJean Delvare /* 655de4155bSJean Delvare * Let i2c-core delete that device on driver removal. 665de4155bSJean Delvare * This is safe because i2c-core holds the core_lock mutex for us. 675de4155bSJean Delvare */ 685de4155bSJean Delvare list_add_tail(&keywest_ctx->client->detected, 69a7cde6d2SLars-Peter Clausen &to_i2c_driver(keywest_ctx->client->dev.driver)->clients); 701da177e4SLinus Torvalds return 0; 711da177e4SLinus Torvalds } 721da177e4SLinus Torvalds 73ed5c2f5fSUwe Kleine-König static void keywest_remove(struct i2c_client *client) 741da177e4SLinus Torvalds { 751da177e4SLinus Torvalds if (! keywest_ctx) 76ed5c2f5fSUwe Kleine-König return; 771da177e4SLinus Torvalds if (client == keywest_ctx->client) 781da177e4SLinus Torvalds keywest_ctx->client = NULL; 791da177e4SLinus Torvalds } 801da177e4SLinus Torvalds 815de4155bSJean Delvare 825de4155bSJean Delvare static const struct i2c_device_id keywest_i2c_id[] = { 8328760c19SWolfram Sang { "MAC,tas3004", 0 }, /* instantiated by i2c-powermac */ 8428760c19SWolfram Sang { "keywest", 0 }, /* instantiated by us if needed */ 855de4155bSJean Delvare { } 865de4155bSJean Delvare }; 87a2bc2af6SJavier Martinez Canillas MODULE_DEVICE_TABLE(i2c, keywest_i2c_id); 885de4155bSJean Delvare 89a656cbf0SJean Delvare static struct i2c_driver keywest_driver = { 905de4155bSJean Delvare .driver = { 915de4155bSJean Delvare .name = "PMac Keywest Audio", 925de4155bSJean Delvare }, 93*1cf47b04SUwe Kleine-König .probe_new = keywest_probe, 945de4155bSJean Delvare .remove = keywest_remove, 955de4155bSJean Delvare .id_table = keywest_i2c_id, 965de4155bSJean Delvare }; 975de4155bSJean Delvare 981da177e4SLinus Torvalds /* exported */ 9965b29f50STakashi Iwai void snd_pmac_keywest_cleanup(struct pmac_keywest *i2c) 1001da177e4SLinus Torvalds { 1011da177e4SLinus Torvalds if (keywest_ctx && keywest_ctx == i2c) { 1021da177e4SLinus Torvalds i2c_del_driver(&keywest_driver); 1031da177e4SLinus Torvalds keywest_ctx = NULL; 1041da177e4SLinus Torvalds } 1051da177e4SLinus Torvalds } 1061da177e4SLinus Torvalds 10715afafc2SBill Pemberton int snd_pmac_tumbler_post_init(void) 1081da177e4SLinus Torvalds { 1091da177e4SLinus Torvalds int err; 1101da177e4SLinus Torvalds 111783eaf46STakashi Iwai if (!keywest_ctx || !keywest_ctx->client) 112783eaf46STakashi Iwai return -ENXIO; 113783eaf46STakashi Iwai 114e73ad388STakashi Iwai err = keywest_ctx->init_client(keywest_ctx); 115e73ad388STakashi Iwai if (err < 0) { 1161da177e4SLinus Torvalds snd_printk(KERN_ERR "tumbler: %i :cannot initialize the MCS\n", err); 1171da177e4SLinus Torvalds return err; 1181da177e4SLinus Torvalds } 1191da177e4SLinus Torvalds return 0; 1201da177e4SLinus Torvalds } 1211da177e4SLinus Torvalds 1221da177e4SLinus Torvalds /* exported */ 12315afafc2SBill Pemberton int snd_pmac_keywest_init(struct pmac_keywest *i2c) 1241da177e4SLinus Torvalds { 125ac397c80SWolfram Sang struct i2c_adapter *adap; 126ac397c80SWolfram Sang int err, i = 0; 1271da177e4SLinus Torvalds 1281da177e4SLinus Torvalds if (keywest_ctx) 1291da177e4SLinus Torvalds return -EBUSY; 1301da177e4SLinus Torvalds 131ac397c80SWolfram Sang adap = i2c_get_adapter(0); 132ac397c80SWolfram Sang if (!adap) 133ac397c80SWolfram Sang return -EPROBE_DEFER; 134ac397c80SWolfram Sang 1351da177e4SLinus Torvalds keywest_ctx = i2c; 1361da177e4SLinus Torvalds 137e73ad388STakashi Iwai err = i2c_add_driver(&keywest_driver); 138e73ad388STakashi Iwai if (err) { 1391da177e4SLinus Torvalds snd_printk(KERN_ERR "cannot register keywest i2c driver\n"); 140ac397c80SWolfram Sang i2c_put_adapter(adap); 1411da177e4SLinus Torvalds return err; 1421da177e4SLinus Torvalds } 143ac397c80SWolfram Sang 14428760c19SWolfram Sang /* There was already a device from i2c-powermac. Great, let's return */ 14528760c19SWolfram Sang if (keywest_probed) 14628760c19SWolfram Sang return 0; 14728760c19SWolfram Sang 148ac397c80SWolfram Sang /* We assume Macs have consecutive I2C bus numbers starting at 0 */ 149ac397c80SWolfram Sang while (adap) { 15028760c19SWolfram Sang /* Scan for devices to be bound to */ 151ac397c80SWolfram Sang err = keywest_attach_adapter(adap); 152ac397c80SWolfram Sang if (!err) 1531da177e4SLinus Torvalds return 0; 154ac397c80SWolfram Sang i2c_put_adapter(adap); 155ac397c80SWolfram Sang adap = i2c_get_adapter(++i); 156ac397c80SWolfram Sang } 157ac397c80SWolfram Sang 158ac397c80SWolfram Sang return -ENODEV; 1591da177e4SLinus Torvalds } 160