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8a9947552d
Just about every i2c chip driver sets the I2C_DF_NOTIFY flag, so we can simply make it the default and drop the flag. If any driver really doesn't want to be notified when i2c adapters are added, that driver can simply omit to set .attach_adapter. This approach is also more robust as it prevents accidental NULL pointer dereferences. Signed-off-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
143 lines
3.3 KiB
C
143 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 struct pmac_keywest *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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.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(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 __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(struct pmac_keywest *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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