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
keywest_probe(struct i2c_client * client)191cf47b04SUwe 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 */
keywest_attach_adapter(struct i2c_adapter * adapter)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
keywest_remove(struct i2c_client * client)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*c894ec01SUwe Kleine-König .probe = keywest_probe,
945de4155bSJean Delvare .remove = keywest_remove,
955de4155bSJean Delvare .id_table = keywest_i2c_id,
965de4155bSJean Delvare };
975de4155bSJean Delvare
981da177e4SLinus Torvalds /* exported */
snd_pmac_keywest_cleanup(struct pmac_keywest * i2c)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
snd_pmac_tumbler_post_init(void)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 */
snd_pmac_keywest_init(struct pmac_keywest * i2c)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 }
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