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![Thomas Gleixner](/assets/img/avatar_default.png)
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 59 temple place suite 330 boston ma 02111 1307 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1334 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
162 lines
3.6 KiB
C
162 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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