mirror of https://gitee.com/openkylin/linux.git
163 lines
3.6 KiB
C
163 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* common keywest i2c layer
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*
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* Copyright (c) by Takashi Iwai <tiwai@suse.de>
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*/
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#include <linux/init.h>
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#include <linux/i2c.h>
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#include <linux/delay.h>
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#include <linux/module.h>
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#include <sound/core.h>
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#include "pmac.h"
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/*
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* we have to keep a static variable here since i2c attach_adapter
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* callback cannot pass a private data.
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*/
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static struct pmac_keywest *keywest_ctx;
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static bool keywest_probed;
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static int keywest_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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keywest_probed = true;
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/* If instantiated via i2c-powermac, we still need to set the client */
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if (!keywest_ctx->client)
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keywest_ctx->client = client;
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i2c_set_clientdata(client, keywest_ctx);
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return 0;
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}
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/*
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* This is kind of a hack, best would be to turn powermac to fixed i2c
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* bus numbers and declare the sound device as part of platform
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* initialization
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*/
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static int keywest_attach_adapter(struct i2c_adapter *adapter)
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{
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struct i2c_board_info info;
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if (! keywest_ctx)
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return -EINVAL;
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if (strncmp(adapter->name, "mac-io", 6))
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return -EINVAL; /* ignored */
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memset(&info, 0, sizeof(struct i2c_board_info));
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strlcpy(info.type, "keywest", I2C_NAME_SIZE);
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info.addr = keywest_ctx->addr;
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keywest_ctx->client = i2c_new_device(adapter, &info);
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if (!keywest_ctx->client)
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return -ENODEV;
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/*
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* We know the driver is already loaded, so the device should be
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* already bound. If not it means binding failed, and then there
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* is no point in keeping the device instantiated.
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*/
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if (!keywest_ctx->client->dev.driver) {
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i2c_unregister_device(keywest_ctx->client);
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keywest_ctx->client = NULL;
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return -ENODEV;
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}
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/*
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* Let i2c-core delete that device on driver removal.
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* This is safe because i2c-core holds the core_lock mutex for us.
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*/
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list_add_tail(&keywest_ctx->client->detected,
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&to_i2c_driver(keywest_ctx->client->dev.driver)->clients);
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return 0;
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}
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static int keywest_remove(struct i2c_client *client)
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{
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if (! keywest_ctx)
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return 0;
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if (client == keywest_ctx->client)
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keywest_ctx->client = NULL;
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return 0;
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}
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static const struct i2c_device_id keywest_i2c_id[] = {
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{ "MAC,tas3004", 0 }, /* instantiated by i2c-powermac */
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{ "keywest", 0 }, /* instantiated by us if needed */
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{ }
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};
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MODULE_DEVICE_TABLE(i2c, keywest_i2c_id);
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static struct i2c_driver keywest_driver = {
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.driver = {
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.name = "PMac Keywest Audio",
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},
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.probe = keywest_probe,
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.remove = keywest_remove,
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.id_table = keywest_i2c_id,
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};
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/* exported */
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void snd_pmac_keywest_cleanup(struct pmac_keywest *i2c)
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{
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if (keywest_ctx && keywest_ctx == i2c) {
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i2c_del_driver(&keywest_driver);
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keywest_ctx = NULL;
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}
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}
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int snd_pmac_tumbler_post_init(void)
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{
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int err;
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if (!keywest_ctx || !keywest_ctx->client)
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return -ENXIO;
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if ((err = keywest_ctx->init_client(keywest_ctx)) < 0) {
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snd_printk(KERN_ERR "tumbler: %i :cannot initialize the MCS\n", err);
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return err;
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}
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return 0;
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}
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/* exported */
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int snd_pmac_keywest_init(struct pmac_keywest *i2c)
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{
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struct i2c_adapter *adap;
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int err, i = 0;
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if (keywest_ctx)
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return -EBUSY;
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adap = i2c_get_adapter(0);
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if (!adap)
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return -EPROBE_DEFER;
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keywest_ctx = i2c;
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if ((err = i2c_add_driver(&keywest_driver))) {
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snd_printk(KERN_ERR "cannot register keywest i2c driver\n");
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i2c_put_adapter(adap);
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return err;
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}
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/* There was already a device from i2c-powermac. Great, let's return */
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if (keywest_probed)
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return 0;
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/* We assume Macs have consecutive I2C bus numbers starting at 0 */
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while (adap) {
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/* Scan for devices to be bound to */
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err = keywest_attach_adapter(adap);
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if (!err)
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return 0;
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i2c_put_adapter(adap);
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adap = i2c_get_adapter(++i);
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}
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return -ENODEV;
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}
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