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sound/ppc/keywest.c
3.54 KB
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/* * 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 */ |
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#include <linux/init.h> #include <linux/i2c.h> #include <linux/delay.h> |
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#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. */ |
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static struct pmac_keywest *keywest_ctx; |
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static int keywest_probe(struct i2c_client *client, const struct i2c_device_id *id) { 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 */ |
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static int keywest_attach_adapter(struct i2c_adapter *adapter) { |
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struct i2c_board_info info; |
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if (! keywest_ctx) return -EINVAL; |
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if (strncmp(adapter->name, "mac-io", 6)) |
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return 0; /* ignored */ |
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memset(&info, 0, sizeof(struct i2c_board_info)); strlcpy(info.type, "keywest", I2C_NAME_SIZE); info.addr = keywest_ctx->addr; keywest_ctx->client = i2c_new_device(adapter, &info); |
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if (!keywest_ctx->client) return -ENODEV; /* * 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->driver) { i2c_unregister_device(keywest_ctx->client); keywest_ctx->client = NULL; return -ENODEV; } |
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/* * 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, &keywest_ctx->client->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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{ if (! keywest_ctx) return 0; if (client == keywest_ctx->client) keywest_ctx->client = NULL; |
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return 0; } |
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static const struct i2c_device_id keywest_i2c_id[] = { { "keywest", 0 }, { } }; |
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static struct i2c_driver keywest_driver = { |
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.driver = { .name = "PMac Keywest Audio", }, .attach_adapter = keywest_attach_adapter, .probe = keywest_probe, .remove = keywest_remove, .id_table = keywest_i2c_id, }; |
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/* exported */ |
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void snd_pmac_keywest_cleanup(struct pmac_keywest *i2c) |
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{ if (keywest_ctx && keywest_ctx == i2c) { i2c_del_driver(&keywest_driver); keywest_ctx = NULL; } } |
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int __devinit snd_pmac_tumbler_post_init(void) |
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{ int err; |
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if (!keywest_ctx || !keywest_ctx->client) return -ENXIO; |
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if ((err = keywest_ctx->init_client(keywest_ctx)) < 0) { snd_printk(KERN_ERR "tumbler: %i :cannot initialize the MCS ", err); return err; } return 0; } /* exported */ |
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int __devinit snd_pmac_keywest_init(struct pmac_keywest *i2c) |
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{ 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 "); return err; } return 0; } |