diff options
Diffstat (limited to 'ANDROID_3.4.5/drivers/i2c/i2c-mux.c')
| -rw-r--r-- | ANDROID_3.4.5/drivers/i2c/i2c-mux.c | 164 |
1 files changed, 0 insertions, 164 deletions
diff --git a/ANDROID_3.4.5/drivers/i2c/i2c-mux.c b/ANDROID_3.4.5/drivers/i2c/i2c-mux.c deleted file mode 100644 index d7a4833b..00000000 --- a/ANDROID_3.4.5/drivers/i2c/i2c-mux.c +++ /dev/null @@ -1,164 +0,0 @@ -/* - * Multiplexed I2C bus driver. - * - * Copyright (c) 2008-2009 Rodolfo Giometti <giometti@linux.it> - * Copyright (c) 2008-2009 Eurotech S.p.A. <info@eurotech.it> - * Copyright (c) 2009-2010 NSN GmbH & Co KG <michael.lawnick.ext@nsn.com> - * - * Simplifies access to complex multiplexed I2C bus topologies, by presenting - * each multiplexed bus segment as an additional I2C adapter. - * Supports multi-level mux'ing (mux behind a mux). - * - * Based on: - * i2c-virt.c from Kumar Gala <galak@kernel.crashing.org> - * i2c-virtual.c from Ken Harrenstien, Copyright (c) 2004 Google, Inc. - * i2c-virtual.c from Brian Kuschak <bkuschak@yahoo.com> - * - * This file is licensed under the terms of the GNU General Public - * License version 2. This program is licensed "as is" without any - * warranty of any kind, whether express or implied. - */ - -#include <linux/kernel.h> -#include <linux/module.h> -#include <linux/slab.h> -#include <linux/i2c.h> -#include <linux/i2c-mux.h> - -/* multiplexer per channel data */ -struct i2c_mux_priv { - struct i2c_adapter adap; - struct i2c_algorithm algo; - - struct i2c_adapter *parent; - void *mux_dev; /* the mux chip/device */ - u32 chan_id; /* the channel id */ - - int (*select)(struct i2c_adapter *, void *mux_dev, u32 chan_id); - int (*deselect)(struct i2c_adapter *, void *mux_dev, u32 chan_id); -}; - -static int i2c_mux_master_xfer(struct i2c_adapter *adap, - struct i2c_msg msgs[], int num) -{ - struct i2c_mux_priv *priv = adap->algo_data; - struct i2c_adapter *parent = priv->parent; - int ret; - - /* Switch to the right mux port and perform the transfer. */ - - ret = priv->select(parent, priv->mux_dev, priv->chan_id); - if (ret >= 0) - ret = parent->algo->master_xfer(parent, msgs, num); - if (priv->deselect) - priv->deselect(parent, priv->mux_dev, priv->chan_id); - - return ret; -} - -static int i2c_mux_smbus_xfer(struct i2c_adapter *adap, - u16 addr, unsigned short flags, - char read_write, u8 command, - int size, union i2c_smbus_data *data) -{ - struct i2c_mux_priv *priv = adap->algo_data; - struct i2c_adapter *parent = priv->parent; - int ret; - - /* Select the right mux port and perform the transfer. */ - - ret = priv->select(parent, priv->mux_dev, priv->chan_id); - if (ret >= 0) - ret = parent->algo->smbus_xfer(parent, addr, flags, - read_write, command, size, data); - if (priv->deselect) - priv->deselect(parent, priv->mux_dev, priv->chan_id); - - return ret; -} - -/* Return the parent's functionality */ -static u32 i2c_mux_functionality(struct i2c_adapter *adap) -{ - struct i2c_mux_priv *priv = adap->algo_data; - struct i2c_adapter *parent = priv->parent; - - return parent->algo->functionality(parent); -} - -struct i2c_adapter *i2c_add_mux_adapter(struct i2c_adapter *parent, - void *mux_dev, u32 force_nr, u32 chan_id, - int (*select) (struct i2c_adapter *, - void *, u32), - int (*deselect) (struct i2c_adapter *, - void *, u32)) -{ - struct i2c_mux_priv *priv; - int ret; - - priv = kzalloc(sizeof(struct i2c_mux_priv), GFP_KERNEL); - if (!priv) - return NULL; - - /* Set up private adapter data */ - priv->parent = parent; - priv->mux_dev = mux_dev; - priv->chan_id = chan_id; - priv->select = select; - priv->deselect = deselect; - - /* Need to do algo dynamically because we don't know ahead - * of time what sort of physical adapter we'll be dealing with. - */ - if (parent->algo->master_xfer) - priv->algo.master_xfer = i2c_mux_master_xfer; - if (parent->algo->smbus_xfer) - priv->algo.smbus_xfer = i2c_mux_smbus_xfer; - priv->algo.functionality = i2c_mux_functionality; - - /* Now fill out new adapter structure */ - snprintf(priv->adap.name, sizeof(priv->adap.name), - "i2c-%d-mux (chan_id %d)", i2c_adapter_id(parent), chan_id); - priv->adap.owner = THIS_MODULE; - priv->adap.algo = &priv->algo; - priv->adap.algo_data = priv; - priv->adap.dev.parent = &parent->dev; - - if (force_nr) { - priv->adap.nr = force_nr; - ret = i2c_add_numbered_adapter(&priv->adap); - } else { - ret = i2c_add_adapter(&priv->adap); - } - if (ret < 0) { - dev_err(&parent->dev, - "failed to add mux-adapter (error=%d)\n", - ret); - kfree(priv); - return NULL; - } - - dev_info(&parent->dev, "Added multiplexed i2c bus %d\n", - i2c_adapter_id(&priv->adap)); - - return &priv->adap; -} -EXPORT_SYMBOL_GPL(i2c_add_mux_adapter); - -int i2c_del_mux_adapter(struct i2c_adapter *adap) -{ - struct i2c_mux_priv *priv = adap->algo_data; - int ret; - - ret = i2c_del_adapter(adap); - if (ret < 0) - return ret; - kfree(priv); - - return 0; -} -EXPORT_SYMBOL_GPL(i2c_del_mux_adapter); - -MODULE_AUTHOR("Rodolfo Giometti <giometti@linux.it>"); -MODULE_DESCRIPTION("I2C driver for multiplexed I2C busses"); -MODULE_LICENSE("GPL v2"); |