166 lines
3.7 KiB
C
166 lines
3.7 KiB
C
// 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"
|
|
|
|
/*
|
|
* we have to keep a static variable here since i2c attach_adapter
|
|
* callback cannot pass a private data.
|
|
*/
|
|
static struct pmac_keywest *keywest_ctx;
|
|
|
|
static bool keywest_probed;
|
|
|
|
static int keywest_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
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));
|
|
strlcpy(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 int keywest_remove(struct i2c_client *client)
|
|
{
|
|
if (! keywest_ctx)
|
|
return 0;
|
|
if (client == keywest_ctx->client)
|
|
keywest_ctx->client = NULL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static const struct i2c_device_id keywest_i2c_id[] = {
|
|
{ "MAC,tas3004", 0 }, /* instantiated by i2c-powermac */
|
|
{ "keywest", 0 }, /* 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;
|
|
|
|
if ((err = keywest_ctx->init_client(keywest_ctx)) < 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;
|
|
|
|
if ((err = i2c_add_driver(&keywest_driver))) {
|
|
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;
|
|
}
|