| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * common keywest i2c layer |
| * |
| * Copyright (c) by Takashi Iwai <tiwai@suse.de> |
| */ |
| |
| |
| #include <linux/init.h> |
| #include <linux/i2c.h> |
| #include <linux/delay.h> |
| #include <linux/module.h> |
| #include <sound/core.h> |
| #include "pmac.h" |
| |
| static struct pmac_keywest *keywest_ctx; |
| static bool keywest_probed; |
| |
| static int keywest_probe(struct i2c_client *client) |
| { |
| keywest_probed = true; |
| /* If instantiated via i2c-powermac, we still need to set the client */ |
| if (!keywest_ctx->client) |
| keywest_ctx->client = client; |
| i2c_set_clientdata(client, keywest_ctx); |
| return 0; |
| } |
| |
| /* |
| * This is kind of a hack, best would be to turn powermac to fixed i2c |
| * bus numbers and declare the sound device as part of platform |
| * initialization |
| */ |
| static int keywest_attach_adapter(struct i2c_adapter *adapter) |
| { |
| struct i2c_board_info info; |
| struct i2c_client *client; |
| |
| if (! keywest_ctx) |
| return -EINVAL; |
| |
| if (strncmp(adapter->name, "mac-io", 6)) |
| return -EINVAL; /* ignored */ |
| |
| memset(&info, 0, sizeof(struct i2c_board_info)); |
| strscpy(info.type, "keywest", I2C_NAME_SIZE); |
| info.addr = keywest_ctx->addr; |
| client = i2c_new_client_device(adapter, &info); |
| if (IS_ERR(client)) |
| return PTR_ERR(client); |
| keywest_ctx->client = client; |
| |
| /* |
| * We know the driver is already loaded, so the device should be |
| * already bound. If not it means binding failed, and then there |
| * is no point in keeping the device instantiated. |
| */ |
| if (!keywest_ctx->client->dev.driver) { |
| i2c_unregister_device(keywest_ctx->client); |
| keywest_ctx->client = NULL; |
| return -ENODEV; |
| } |
| |
| /* |
| * Let i2c-core delete that device on driver removal. |
| * This is safe because i2c-core holds the core_lock mutex for us. |
| */ |
| list_add_tail(&keywest_ctx->client->detected, |
| &to_i2c_driver(keywest_ctx->client->dev.driver)->clients); |
| return 0; |
| } |
| |
| static void keywest_remove(struct i2c_client *client) |
| { |
| if (! keywest_ctx) |
| return; |
| if (client == keywest_ctx->client) |
| keywest_ctx->client = NULL; |
| } |
| |
| |
| static const struct i2c_device_id keywest_i2c_id[] = { |
| { "MAC,tas3004" }, /* instantiated by i2c-powermac */ |
| { "keywest" }, /* instantiated by us if needed */ |
| { } |
| }; |
| MODULE_DEVICE_TABLE(i2c, keywest_i2c_id); |
| |
| static struct i2c_driver keywest_driver = { |
| .driver = { |
| .name = "PMac Keywest Audio", |
| }, |
| .probe = keywest_probe, |
| .remove = keywest_remove, |
| .id_table = keywest_i2c_id, |
| }; |
| |
| /* exported */ |
| void snd_pmac_keywest_cleanup(struct pmac_keywest *i2c) |
| { |
| if (keywest_ctx && keywest_ctx == i2c) { |
| i2c_del_driver(&keywest_driver); |
| keywest_ctx = NULL; |
| } |
| } |
| |
| int snd_pmac_tumbler_post_init(void) |
| { |
| int err; |
| |
| if (!keywest_ctx || !keywest_ctx->client) |
| return -ENXIO; |
| |
| err = keywest_ctx->init_client(keywest_ctx); |
| if (err < 0) { |
| snd_printk(KERN_ERR "tumbler: %i :cannot initialize the MCS\n", err); |
| return err; |
| } |
| return 0; |
| } |
| |
| /* exported */ |
| int snd_pmac_keywest_init(struct pmac_keywest *i2c) |
| { |
| struct i2c_adapter *adap; |
| int err, i = 0; |
| |
| if (keywest_ctx) |
| return -EBUSY; |
| |
| adap = i2c_get_adapter(0); |
| if (!adap) |
| return -EPROBE_DEFER; |
| |
| keywest_ctx = i2c; |
| |
| err = i2c_add_driver(&keywest_driver); |
| if (err) { |
| snd_printk(KERN_ERR "cannot register keywest i2c driver\n"); |
| i2c_put_adapter(adap); |
| return err; |
| } |
| |
| /* There was already a device from i2c-powermac. Great, let's return */ |
| if (keywest_probed) |
| return 0; |
| |
| /* We assume Macs have consecutive I2C bus numbers starting at 0 */ |
| while (adap) { |
| /* Scan for devices to be bound to */ |
| err = keywest_attach_adapter(adap); |
| if (!err) |
| return 0; |
| i2c_put_adapter(adap); |
| adap = i2c_get_adapter(++i); |
| } |
| |
| return -ENODEV; |
| } |