/* * common keywest i2c layer * * Copyright (c) by Takashi Iwai <tiwai@suse.de> * * 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 */ #include <linux/init.h> #include <linux/i2c.h> #include <linux/delay.h> #include <linux/slab.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 int keywest_attach_adapter(struct i2c_adapter *adapter); static int keywest_detach_client(struct i2c_client *client); struct i2c_driver keywest_driver = { .driver = { .name = "PMac Keywest Audio", }, .attach_adapter = &keywest_attach_adapter, .detach_client = &keywest_detach_client, }; #ifndef i2c_device_name #define i2c_device_name(x) ((x)->name) #endif static int keywest_attach_adapter(struct i2c_adapter *adapter) { int err; struct i2c_client *new_client; if (! keywest_ctx) return -EINVAL; if (strncmp(i2c_device_name(adapter), "mac-io", 6)) return 0; /* ignored */ new_client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL); if (! new_client) return -ENOMEM; new_client->addr = keywest_ctx->addr; i2c_set_clientdata(new_client, keywest_ctx); new_client->adapter = adapter; new_client->driver = &keywest_driver; new_client->flags = 0; strcpy(i2c_device_name(new_client), keywest_ctx->name); keywest_ctx->client = new_client; /* Tell the i2c layer a new client has arrived */ if (i2c_attach_client(new_client)) { snd_printk(KERN_ERR "tumbler: cannot attach i2c client\n"); err = -ENODEV; goto __err; } return 0; __err: kfree(new_client); keywest_ctx->client = NULL; return err; } static int keywest_detach_client(struct i2c_client *client) { if (! keywest_ctx) return 0; if (client == keywest_ctx->client) keywest_ctx->client = NULL; i2c_detach_client(client); kfree(client); return 0; } /* 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 __init 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 __init snd_pmac_keywest_init(struct pmac_keywest *i2c) { int err; if (keywest_ctx) return -EBUSY; keywest_ctx = i2c; if ((err = i2c_add_driver(&keywest_driver))) { snd_printk(KERN_ERR "cannot register keywest i2c driver\n"); return err; } return 0; }