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The LITMUS^RT kernel.

Bjoern Brandenburg

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Peter Rosin <peda@axentia.se> 2016-05-04 16:15:29 -0400 committer Wolfram Sang <wsa@the-dreams.de> 2016-05-04 16:39:17 -0400 i2c: mux: relax locking of the top i2c adapter during mux-locked muxing' href='/cgit/cgit.cgi/litmus-rt-budgetable-locks.git/.git/commit/drivers/i2c/i2c-mux.c?h=update_litmus_2019&id=6ef91fcca8a8ba3df9810a4cc6cd6a9d3f21bf45'>6ef91fcca8a8

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/*
 * 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/acpi.h>
#include <linux/i2c.h>
#include <linux/i2c-mux.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/slab.h>

/* multiplexer per channel data */
struct i2c_mux_priv {
	struct i2c_adapter adap;
	struct i2c_algorithm algo;
	struct i2c_mux_core *muxc;
	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_mux_core *muxc = priv->muxc;
	struct i2c_adapter *parent = muxc->parent;
	int ret;

	/* Switch to the right mux port and perform the transfer. */

	ret = muxc->select(muxc, priv->chan_id);
	if (ret >= 0)
		ret = __i2c_transfer(parent, msgs, num);
	if (muxc->deselect)
		muxc->deselect(muxc, priv->chan_id);

	return ret;
}

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_mux_core *muxc = priv->muxc;
	struct i2c_adapter *parent = muxc->parent;
	int ret;

	/* Switch to the right mux port and perform the transfer. */

	ret = muxc->select(muxc, priv->chan_id);
	if (ret >= 0)
		ret = i2c_transfer(parent, msgs, num);
	if (muxc->deselect)
		muxc->deselect(muxc, 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_mux_core *muxc = priv->muxc;
	struct i2c_adapter *parent = muxc->parent;
	int ret;

	/* Select the right mux port and perform the transfer. */

	ret = muxc->select(muxc, priv->chan_id);
	if (ret >= 0)
		ret = parent->algo->smbus_xfer(parent, addr, flags,
					read_write, command, size, data);
	if (muxc->deselect)
		muxc->deselect(muxc, 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_mux_core *muxc = priv->muxc;
	struct i2c_adapter *parent = muxc->parent;
	int ret;

	/* Select the right mux port and perform the transfer. */

	ret = muxc->select(muxc, priv->chan_id);
	if (ret >= 0)


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