mirror of https://gitee.com/openkylin/linux.git
144 lines
3.3 KiB
C
144 lines
3.3 KiB
C
/*
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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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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <sound/driver.h>
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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/i2c-dev.h>
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#include <linux/slab.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 pmac_keywest_t *keywest_ctx;
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#define I2C_DRIVERID_KEYWEST 0xFEBA
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static int keywest_attach_adapter(struct i2c_adapter *adapter);
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static int keywest_detach_client(struct i2c_client *client);
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struct i2c_driver keywest_driver = {
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.name = "PMac Keywest Audio",
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.id = I2C_DRIVERID_KEYWEST,
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.flags = I2C_DF_NOTIFY,
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.attach_adapter = &keywest_attach_adapter,
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.detach_client = &keywest_detach_client,
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};
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#ifndef i2c_device_name
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#define i2c_device_name(x) ((x)->name)
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#endif
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static int keywest_attach_adapter(struct i2c_adapter *adapter)
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{
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int err;
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struct i2c_client *new_client;
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if (! keywest_ctx)
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return -EINVAL;
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if (strncmp(i2c_device_name(adapter), "mac-io", 6))
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return 0; /* ignored */
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new_client = kmalloc(sizeof(struct i2c_client), GFP_KERNEL);
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if (! new_client)
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return -ENOMEM;
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memset(new_client, 0, sizeof(*new_client));
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new_client->addr = keywest_ctx->addr;
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i2c_set_clientdata(new_client, keywest_ctx);
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new_client->adapter = adapter;
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new_client->driver = &keywest_driver;
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new_client->flags = 0;
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strcpy(i2c_device_name(new_client), keywest_ctx->name);
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keywest_ctx->client = new_client;
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/* Tell the i2c layer a new client has arrived */
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if (i2c_attach_client(new_client)) {
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snd_printk(KERN_ERR "tumbler: cannot attach i2c client\n");
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err = -ENODEV;
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goto __err;
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}
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return 0;
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__err:
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kfree(new_client);
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keywest_ctx->client = NULL;
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return err;
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}
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static int keywest_detach_client(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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i2c_detach_client(client);
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kfree(client);
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return 0;
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}
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/* exported */
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void snd_pmac_keywest_cleanup(pmac_keywest_t *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 __init snd_pmac_tumbler_post_init(void)
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{
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int err;
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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 __init snd_pmac_keywest_init(pmac_keywest_t *i2c)
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{
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int err;
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if (keywest_ctx)
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return -EBUSY;
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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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return err;
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}
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return 0;
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}
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