litmus-rt.git - The LITMUS^RT kernel.

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author	Linus Torvalds <torvalds@woody.linux-foundation.org>	2008-01-04 13:44:17 -0500
committer	Linus Torvalds <torvalds@woody.linux-foundation.org>	2008-01-04 13:44:17 -0500
commit	439f61b9f9ebbf84fb7e6b3539fc3794e046bbb9 (patch)
tree	9aeec0e7248175ece16586552bb44655bdcbe028 /drivers/cpufreq/cpufreq.c
parent	2022c1f136067f673964dcaffa1cae1008ddcd74 (diff)
parent	7fde4d779b83898851959f837c9b26fe07ee91c9 (diff)

Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6: [ISDN]: i4l: Fix DLE handling for i4l-audio [ISDN] i4l: 'NO CARRIER' message lost after ldisc flush [CONNECTOR]: Return proper error code in cn_call_callback() [INET]: Fix netdev renaming and inet address labels [CASSINI]: Bump driver version and release date. [CASSINI]: Fix two obvious NAPI bugs. [CASSINI]: Set skb->truesize properly on receive packets. [CASSINI]: Program parent Intel31154 bridge when necessary. [CASSINI]: Revert 'dont touch page_count'. [CASSINI]: Fix endianness bug. [XFRM]: Do not define km_migrate() if !CONFIG_XFRM_MIGRATE [X25]: Add missing x25_neigh_put

Diffstat (limited to 'drivers/cpufreq/cpufreq.c')

0 files changed, 0 insertions, 0 deletions

/* * 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> #include <linux/of.h> /* multiplexer per channel data */ struct i2c_mux_priv { struct i2c_adapter adap; struct i2c_algorithm algo; struct i2c_adapter *parent; void *mux_priv; /* the mux chip/device */ u32 chan_id; /* the channel id */ int (*select)(struct i2c_adapter *, void *mux_priv, u32 chan_id); int (*deselect)(struct i2c_adapter *, void *mux_priv, 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_priv, priv->chan_id); if (ret >= 0) ret = parent->algo->master_xfer(parent, msgs, num); if (priv->deselect) priv->deselect(parent, priv->mux_priv, 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_priv, 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_priv, 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); } /* Return all parent classes, merged */ static unsigned int i2c_mux_parent_classes(struct i2c_adapter *parent) { unsigned int class = 0; do { class |= parent->class; parent = i2c_parent_is_i2c_adapter(parent); } while (parent); return class; } struct i2c_adapter *i2c_add_mux_adapter(struct i2c_adapter *parent, struct device *mux_dev, void *mux_priv, u32 force_nr, u32 chan_id, unsigned int class, int (*select) (struct i2c_adapter *, void *, u32), int (*deselect) (struct i2c_adapter *, void *, u32)) { struct i2c_mux_priv *priv; char symlink_name[20]; 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_priv = mux_priv; 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; priv->adap.retries = parent->retries; priv->adap.timeout = parent->timeout; /* Sanity check on class */ if (i2c_mux_parent_classes(parent) & class) dev_err(&parent->dev, "Segment %d behind mux can't share classes with ancestors\n", chan_id); else priv->adap.class = class; /* * Try to populate the mux adapter's of_node, expands to * nothing if !CONFIG_OF. */ if (mux_dev->of_node) { struct device_node *child; u32 reg; for_each_child_of_node(mux_dev->of_node, child) { ret = of_property_read_u32(child, "reg", &reg); if (ret) continue; if (chan_id == reg) { priv->adap.dev.of_node = child; break; } } } 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; } WARN(sysfs_create_link(&priv->adap.dev.kobj, &mux_dev->kobj, "mux_device"), "can't create symlink to mux device\n"); snprintf(symlink_name, sizeof(symlink_name), "channel-%u", chan_id); WARN(sysfs_create_link(&mux_dev->kobj, &priv->adap.dev.kobj, symlink_name), "can't create symlink for channel %u\n", chan_id); 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); void i2c_del_mux_adapter(struct i2c_adapter *adap) { struct i2c_mux_priv *priv = adap->algo_data; char symlink_name[20]; snprintf(symlink_name, sizeof(symlink_name), "channel-%u", priv->chan_id); sysfs_remove_link(&adap->dev.parent->kobj, symlink_name); sysfs_remove_link(&priv->adap.dev.kobj, "mux_device"); i2c_del_adapter(adap); kfree(priv); } 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");


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