From: Michael Lawnick <ml.lawnick-Mmb7MZpHnFY@public.gmane.org>
To: Linux I2C <linux-i2c-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
Cc: Jean Delvare <khali-PUYAD+kWke1g9hUCZPvPmw@public.gmane.org>
Subject: [Patch v3] i2c: Multiplexed I2C bus core support
Date: Fri, 09 Jul 2010 11:07:46 +0200 [thread overview]
Message-ID: <4C36E6E2.1070307@gmx.de> (raw)
Add multiplexed bus core support. I2C multiplexer and switches
like pca954x get instantiated as new adapters per port.
Signed-off-by: Michael Lawnick <demx1175@wbit01lx.(none)>
Cc: Jean Delvare <khali-PUYAD+kWke1g9hUCZPvPmw@public.gmane.org>
---
Based on kernel 2.6.35.rc2 +
[PATCH] i2c: Move adapter locking helpers to i2c-core
by Jean Delware <20100615140218.07090c90-ig7AzVSIIG7kN2dkZ6Wm7A@public.gmane.org>
<http://article.gmane.org/gmane.linux.drivers.i2c/6226/match=i2c+move+adapter+locking+helpers+i2c+core>
drivers/i2c/Kconfig | 11 +++
drivers/i2c/Makefile | 1 +
drivers/i2c/i2c-core.c | 80 +++++++++++++++++----
drivers/i2c/i2c-dev.c | 44 +++++++++++-
drivers/i2c/i2c-mux.c | 165
+++++++++++++++++++++++++++++++++++++++++++
include/linux/i2c-mux.h | 46 ++++++++++++
include/linux/i2c.h | 8 ++
7 files changed, 341 insertions(+), 14 deletions(-)
create mode 100755 drivers/i2c/i2c-mux.c
create mode 100755 include/linux/i2c-mux.h
diff --git a/drivers/i2c/Kconfig b/drivers/i2c/Kconfig
index d06083f..efb48ad
--- a/drivers/i2c/Kconfig
+++ b/drivers/i2c/Kconfig
@@ -47,6 +47,17 @@ config I2C_CHARDEV
This support is also available as a module. If so, the module
will be called i2c-dev.
+config I2C_MUX
+ tristate "I2C bus multiplexing support"
+ depends on EXPERIMENTAL
+ help
+ Say Y here if you want the I2C core to support the ability to
+ handle multiplexed I2C bus topologies, by presenting each
+ multiplexed segment as a I2C adapter.
+
+ This support is also available as a module. If so, the module
+ will be called i2c-mux.
+
config I2C_HELPER_AUTO
bool "Autoselect pertinent helper modules"
default y
diff --git a/drivers/i2c/Makefile b/drivers/i2c/Makefile
index a7d9b4b..f363258
--- a/drivers/i2c/Makefile
+++ b/drivers/i2c/Makefile
@@ -6,6 +6,7 @@ obj-$(CONFIG_I2C_BOARDINFO) += i2c-boardinfo.o
obj-$(CONFIG_I2C) += i2c-core.o
obj-$(CONFIG_I2C_SMBUS) += i2c-smbus.o
obj-$(CONFIG_I2C_CHARDEV) += i2c-dev.o
+obj-$(CONFIG_I2C_MUX) += i2c-mux.o
obj-y += algos/ busses/
ifeq ($(CONFIG_I2C_DEBUG_CORE),y)
diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index 05a147a..d46fb3e
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -20,7 +20,9 @@
/* With some changes from Kyösti Mälkki <kmalkki@cc.hut.fi>.
All SMBus-related things are written by Frodo Looijaard <frodol@dds.nl>
SMBus 2.0 support by Mark Studebaker <mdsxyz123-/E1597aS9LQAvxtiuMwx3w@public.gmane.org> and
- Jean Delvare <khali-PUYAD+kWke1g9hUCZPvPmw@public.gmane.org> */
+ Jean Delvare <khali-PUYAD+kWke1g9hUCZPvPmw@public.gmane.org>
+ Mux support by Rodolfo Giometti <giometti-AVVDYK/kqiJWk0Htik3J/w@public.gmane.org> and
+ Michael Lawnick <michael.lawnick.ext-OYasijW0DpE@public.gmane.org> */
#include <linux/module.h>
#include <linux/kernel.h>
@@ -417,10 +419,52 @@ static int __i2c_check_addr_busy(struct device
*dev, void *addrp)
return 0;
}
+/* walk up mux tree */
+static int i2c_check_mux_parents(struct i2c_adapter *adapter, int addr)
+{
+ int result;
+
+ result = device_for_each_child(&adapter->dev, &addr,
+ __i2c_check_addr_busy);
+
+ if (!result && i2c_parent_is_i2c_adapter(adapter))
+ result = i2c_check_mux_parents(
+ to_i2c_adapter(adapter->dev.parent), addr);
+
+ return result;
+}
+
+/* recurse down mux tree */
+static int i2c_check_mux_children(struct device *dev, void *addrp)
+{
+ int result;
+
+ if (dev->type == &i2c_adapter_type)
+ result = device_for_each_child(dev, addrp,
+ i2c_check_mux_children);
+ else
+ result = __i2c_check_addr_busy(dev, addrp);
+
+ return result;
+}
+
static int i2c_check_addr_busy(struct i2c_adapter *adapter, int addr)
{
- return device_for_each_child(&adapter->dev, &addr,
- __i2c_check_addr_busy);
+ int result = 0;
+
+ i2c_lock_adapter(adapter);
+
+ if (i2c_parent_is_i2c_adapter(adapter))
+ result = i2c_check_mux_parents(
+ to_i2c_adapter(adapter->dev.parent), addr);
+
+ if (!result)
+ result = device_for_each_child(&adapter->dev, &addr,
+ i2c_check_mux_children);
+
+ i2c_unlock_adapter(adapter);
+
+ return result;
}
/**
@@ -429,7 +473,10 @@ static int i2c_check_addr_busy(struct i2c_adapter
*adapter, int addr)
*/
void i2c_lock_adapter(struct i2c_adapter *adapter)
{
- rt_mutex_lock(&adapter->bus_lock);
+ if (i2c_parent_is_i2c_adapter(adapter))
+ i2c_lock_adapter(to_i2c_adapter(adapter->dev.parent));
+ else
+ rt_mutex_lock(&adapter->bus_lock);
}
EXPORT_SYMBOL_GPL(i2c_lock_adapter);
@@ -439,7 +486,10 @@ EXPORT_SYMBOL_GPL(i2c_lock_adapter);
*/
static int i2c_trylock_adapter(struct i2c_adapter *adapter)
{
- return rt_mutex_trylock(&adapter->bus_lock);
+ if (i2c_parent_is_i2c_adapter(adapter))
+ return i2c_trylock_adapter(to_i2c_adapter(adapter->dev.parent));
+ else
+ return rt_mutex_trylock(&adapter->bus_lock);
}
/**
@@ -448,7 +498,10 @@ static int i2c_trylock_adapter(struct i2c_adapter
*adapter)
*/
void i2c_unlock_adapter(struct i2c_adapter *adapter)
{
- rt_mutex_unlock(&adapter->bus_lock);
+ if (i2c_parent_is_i2c_adapter(adapter))
+ i2c_unlock_adapter(to_i2c_adapter(adapter->dev.parent));
+ else
+ rt_mutex_unlock(&adapter->bus_lock);
}
EXPORT_SYMBOL_GPL(i2c_unlock_adapter);
@@ -656,9 +709,9 @@ i2c_sysfs_new_device(struct device *dev, struct
device_attribute *attr,
return -EINVAL;
/* Keep track of the added device */
- i2c_lock_adapter(adap);
+ rt_mutex_lock(&adap->bus_lock);
list_add_tail(&client->detected, &adap->userspace_clients);
- i2c_unlock_adapter(adap);
+ rt_mutex_unlock(&adap->bus_lock);
dev_info(dev, "%s: Instantiated device %s at 0x%02hx\n", "new_device",
info.type, info.addr);
@@ -697,7 +750,7 @@ i2c_sysfs_delete_device(struct device *dev, struct
device_attribute *attr,
/* Make sure the device was added through sysfs */
res = -ENOENT;
- i2c_lock_adapter(adap);
+ rt_mutex_lock(&adap->bus_lock);
list_for_each_entry_safe(client, next, &adap->userspace_clients,
detected) {
if (client->addr == addr) {
@@ -710,7 +763,7 @@ i2c_sysfs_delete_device(struct device *dev, struct
device_attribute *attr,
break;
}
}
- i2c_unlock_adapter(adap);
+ rt_mutex_unlock(&adap->bus_lock);
if (res < 0)
dev_err(dev, "%s: Can't find device in list\n",
@@ -737,10 +790,11 @@ static const struct attribute_group
*i2c_adapter_attr_groups[] = {
NULL
};
-static struct device_type i2c_adapter_type = {
+struct device_type i2c_adapter_type = {
.groups = i2c_adapter_attr_groups,
.release = i2c_adapter_dev_release,
};
+EXPORT_SYMBOL_GPL(i2c_adapter_type);
#ifdef CONFIG_I2C_COMPAT
static struct class_compat *i2c_adapter_compat_class;
@@ -995,7 +1049,7 @@ int i2c_del_adapter(struct i2c_adapter *adap)
return res;
/* Remove devices instantiated from sysfs */
- i2c_lock_adapter(adap);
+ rt_mutex_lock(&adap->bus_lock);
list_for_each_entry_safe(client, next, &adap->userspace_clients,
detected) {
dev_dbg(&adap->dev, "Removing %s at 0x%x\n", client->name,
@@ -1003,7 +1057,7 @@ int i2c_del_adapter(struct i2c_adapter *adap)
list_del(&client->detected);
i2c_unregister_device(client);
}
- i2c_unlock_adapter(adap);
+ rt_mutex_unlock(&adap->bus_lock);
/* Detach any active clients. This can't fail, thus we do not
checking the returned value. */
diff --git a/drivers/i2c/i2c-dev.c b/drivers/i2c/i2c-dev.c
index e0694e4..6717bba
--- a/drivers/i2c/i2c-dev.c
+++ b/drivers/i2c/i2c-dev.c
@@ -193,12 +193,54 @@ static int i2cdev_check(struct device *dev, void
*addrp)
return dev->driver ? -EBUSY : 0;
}
+/* walk up mux tree */
+static int i2cdev_check_mux_parents(struct i2c_adapter *adapter, int addr)
+{
+ int result;
+
+ result = device_for_each_child(&adapter->dev, &addr, i2cdev_check);
+
+ if (!result && i2c_parent_is_i2c_adapter(adapter))
+ result = i2cdev_check_mux_parents(
+ to_i2c_adapter(adapter->dev.parent), addr);
+
+ return result;
+}
+
+/* recurse down mux tree */
+static int i2cdev_check_mux_children(struct device *dev, void *addrp)
+{
+ int result;
+
+ if (dev->type == &i2c_adapter_type)
+ result = device_for_each_child(dev, addrp,
+ i2cdev_check_mux_children);
+ else
+ result = i2cdev_check(dev, addrp);
+
+ return result;
+}
+
/* This address checking function differs from the one in i2c-core
in that it considers an address with a registered device, but no
driver bound to it, as NOT busy. */
static int i2cdev_check_addr(struct i2c_adapter *adapter, unsigned int
addr)
{
- return device_for_each_child(&adapter->dev, &addr, i2cdev_check);
+ int result = 0;
+
+ i2c_lock_adapter(adapter);
+
+ if (i2c_parent_is_i2c_adapter(adapter))
+ result = i2cdev_check_mux_parents(
+ to_i2c_adapter(adapter->dev.parent), addr);
+
+ if (!result)
+ result = device_for_each_child(&adapter->dev, &addr,
+ i2cdev_check_mux_children);
+
+ i2c_unlock_adapter(adapter);
+
+ return result;
}
static noinline int i2cdev_ioctl_rdrw(struct i2c_client *client,
diff --git a/drivers/i2c/i2c-mux.c b/drivers/i2c/i2c-mux.c
new file mode 100755
index 0000000..d32a484
--- /dev/null
+++ b/drivers/i2c/i2c-mux.c
@@ -0,0 +1,165 @@
+/*
+ * Multiplexed I2C bus driver.
+ *
+ * Copyright (c) 2008-2009 Rodolfo Giometti <giometti-k2GhghHVRtY@public.gmane.org>
+ * Copyright (c) 2008-2009 Eurotech S.p.A. <info-ymFC7zkAqBI1GQ1Ptb7lUw@public.gmane.org>
+ * 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-XVmvHMARGAS8U2dJNN8I7kB+6BGkLq7r@public.gmane.org>
+ * i2c-virtual.c from Ken Harrenstien, Copyright (c) 2004 Google, Inc.
+ * i2c-virtual.c from Brian Kuschak <bkuschak-/E1597aS9LQAvxtiuMwx3w@public.gmane.org>
+ *
+ * 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.id = parent->id;
+ 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-k2GhghHVRtY@public.gmane.org>");
+MODULE_DESCRIPTION("I2C driver for multiplexed I2C busses");
+MODULE_LICENSE("GPL v2");
diff --git a/include/linux/i2c-mux.h b/include/linux/i2c-mux.h
new file mode 100755
index 0000000..4c52ee1
--- /dev/null
+++ b/include/linux/i2c-mux.h
@@ -0,0 +1,46 @@
+/*
+ *
+ * i2c-mux.h - functions for the i2c-bus mux support
+ *
+ * Copyright (c) 2008-2009 Rodolfo Giometti <giometti-k2GhghHVRtY@public.gmane.org>
+ * Copyright (c) 2008-2009 Eurotech S.p.A. <info-ymFC7zkAqBI1GQ1Ptb7lUw@public.gmane.org>
+ * Michael Lawnick <michael.lawnick.ext-OYasijW0DpE@public.gmane.org>
+ *
+ * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifndef _LINUX_I2C_MUX_H
+#define _LINUX_I2C_MUX_H
+
+#ifdef __KERNEL__
+
+/*
+ * Called to create a i2c bus on a multiplexed bus segment.
+ * The mux_dev and chan_id parameters are passed to the select
+ * and deselect callback functions to perform hardware-specific
+ * mux control.
+ */
+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 *adap,
+ void *mux_dev, u32 chan_id),
+ int (*deselect) (struct i2c_adapter *,
+ void *mux_dev, u32 chan_id));
+
+int i2c_del_mux_adapter(struct i2c_adapter *adap);
+
+#endif /* __KERNEL__ */
+
+#endif /* _LINUX_I2C_MUX_H */
diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index f2d36bd..8f2b83a
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -37,6 +37,7 @@
#include <linux/of.h> /* for struct device_node */
extern struct bus_type i2c_bus_type;
+extern struct device_type i2c_adapter_type;
/* --- General options ------------------------------------------------ */
@@ -374,6 +375,13 @@ static inline void i2c_set_adapdata(struct
i2c_adapter *dev, void *data)
dev_set_drvdata(&dev->dev, data);
}
+static inline int i2c_parent_is_i2c_adapter(const struct i2c_adapter
*adapter)
+{
+ return adapter->dev.parent != NULL
+ && adapter->dev.parent->bus == &i2c_bus_type
+ && adapter->dev.parent->type == &i2c_adapter_type;
+}
+
/* Adapter locking functions, exported for shared pin cases */
void i2c_lock_adapter(struct i2c_adapter *);
void i2c_unlock_adapter(struct i2c_adapter *);
--
Michael Lawnick
next reply other threads:[~2010-07-09 9:07 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-07-09 9:07 Michael Lawnick [this message]
[not found] ` <4C36E6E2.1070307-Mmb7MZpHnFY@public.gmane.org>
2010-07-19 15:25 ` [Patch v3] i2c: Multiplexed I2C bus core support Jean Delvare
[not found] ` <20100719172548.2d88ed73-ig7AzVSIIG7kN2dkZ6Wm7A@public.gmane.org>
2010-07-20 6:44 ` Michael Lawnick
[not found] ` <4C4545C7.4070508-Mmb7MZpHnFY@public.gmane.org>
2010-07-20 8:53 ` Jean Delvare
[not found] ` <20100720105351.58541932-ig7AzVSIIG7kN2dkZ6Wm7A@public.gmane.org>
2010-07-22 13:08 ` Michael Lawnick
2010-07-20 19:27 ` Jean Delvare
[not found] ` <20100720212729.4d81048b-ig7AzVSIIG7kN2dkZ6Wm7A@public.gmane.org>
2010-07-22 6:42 ` Rodolfo Giometti
[not found] ` <20100722064243.GB9753-AVVDYK/kqiJWk0Htik3J/w@public.gmane.org>
2010-08-10 12:33 ` Jean Delvare
[not found] ` <20100810143335.406dd2c5-ig7AzVSIIG7kN2dkZ6Wm7A@public.gmane.org>
2010-08-10 17:05 ` Rodolfo Giometti
[not found] ` <20100810170525.GA17506-h5F9bMWSfx92wUeKyQHPq0EOCMrvLtNR@public.gmane.org>
2010-08-23 11:00 ` Michael Lawnick
2013-02-13 15:36 ` Gerlando Falauto
[not found] ` <511BB2F8.9020300-SkAbAL50j+5BDgjK7y7TUQ@public.gmane.org>
2013-02-18 10:19 ` Michael Lawnick
[not found] ` <51220036.4030508-Mmb7MZpHnFY@public.gmane.org>
2013-02-18 10:38 ` Gerlando Falauto
[not found] ` <512204BC.7060603-SkAbAL50j+5BDgjK7y7TUQ@public.gmane.org>
2013-02-18 14:01 ` Michael Lawnick
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