diff options
Diffstat (limited to 'sound/ppc/keywest.c')
| -rw-r--r-- | sound/ppc/keywest.c | 175 |
1 files changed, 175 insertions, 0 deletions
diff --git a/sound/ppc/keywest.c b/sound/ppc/keywest.c new file mode 100644 index 000000000..4373615f1 --- /dev/null +++ b/sound/ppc/keywest.c @@ -0,0 +1,175 @@ +/* + * 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/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; + + 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; + keywest_ctx->client = i2c_new_device(adapter, &info); + 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->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; +} |