linux/drivers/i2c/muxes/i2c-mux-gpmux.c
Rob Herring 59738ab266 I2C: Explicitly include correct DT includes
The DT of_device.h and of_platform.h date back to the separate
of_platform_bus_type before it as merged into the regular platform bus.
As part of that merge prepping Arm DT support 13 years ago, they
"temporarily" include each other. They also include platform_device.h
and of.h. As a result, there's a pretty much random mix of those include
files used throughout the tree. In order to detangle these headers and
replace the implicit includes with struct declarations, users need to
explicitly include the correct includes.

Signed-off-by: Rob Herring <robh@kernel.org>
Reviewed-by: Andi Shyti <andi.shyti@kernel.org>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
2023-08-14 17:47:21 +02:00

166 lines
3.5 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* General Purpose I2C multiplexer
*
* Copyright (C) 2017 Axentia Technologies AB
*
* Author: Peter Rosin <peda@axentia.se>
*/
#include <linux/i2c.h>
#include <linux/i2c-mux.h>
#include <linux/module.h>
#include <linux/mux/consumer.h>
#include <linux/of.h>
#include <linux/platform_device.h>
struct mux {
struct mux_control *control;
bool do_not_deselect;
};
static int i2c_mux_select(struct i2c_mux_core *muxc, u32 chan)
{
struct mux *mux = i2c_mux_priv(muxc);
int ret;
ret = mux_control_select(mux->control, chan);
mux->do_not_deselect = ret < 0;
return ret;
}
static int i2c_mux_deselect(struct i2c_mux_core *muxc, u32 chan)
{
struct mux *mux = i2c_mux_priv(muxc);
if (mux->do_not_deselect)
return 0;
return mux_control_deselect(mux->control);
}
static struct i2c_adapter *mux_parent_adapter(struct device *dev)
{
struct device_node *np = dev->of_node;
struct device_node *parent_np;
struct i2c_adapter *parent;
parent_np = of_parse_phandle(np, "i2c-parent", 0);
if (!parent_np) {
dev_err(dev, "Cannot parse i2c-parent\n");
return ERR_PTR(-ENODEV);
}
parent = of_find_i2c_adapter_by_node(parent_np);
of_node_put(parent_np);
if (!parent)
return ERR_PTR(-EPROBE_DEFER);
return parent;
}
static const struct of_device_id i2c_mux_of_match[] = {
{ .compatible = "i2c-mux", },
{},
};
MODULE_DEVICE_TABLE(of, i2c_mux_of_match);
static int i2c_mux_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *np = dev->of_node;
struct device_node *child;
struct i2c_mux_core *muxc;
struct mux *mux;
struct i2c_adapter *parent;
int children;
int ret;
if (!np)
return -ENODEV;
mux = devm_kzalloc(dev, sizeof(*mux), GFP_KERNEL);
if (!mux)
return -ENOMEM;
mux->control = devm_mux_control_get(dev, NULL);
if (IS_ERR(mux->control))
return dev_err_probe(dev, PTR_ERR(mux->control),
"failed to get control-mux\n");
parent = mux_parent_adapter(dev);
if (IS_ERR(parent))
return dev_err_probe(dev, PTR_ERR(parent),
"failed to get i2c-parent adapter\n");
children = of_get_child_count(np);
muxc = i2c_mux_alloc(parent, dev, children, 0, 0,
i2c_mux_select, i2c_mux_deselect);
if (!muxc) {
ret = -ENOMEM;
goto err_parent;
}
muxc->priv = mux;
platform_set_drvdata(pdev, muxc);
muxc->mux_locked = of_property_read_bool(np, "mux-locked");
for_each_child_of_node(np, child) {
u32 chan;
ret = of_property_read_u32(child, "reg", &chan);
if (ret < 0) {
dev_err(dev, "no reg property for node '%pOFn'\n",
child);
goto err_children;
}
if (chan >= mux_control_states(mux->control)) {
dev_err(dev, "invalid reg %u\n", chan);
ret = -EINVAL;
goto err_children;
}
ret = i2c_mux_add_adapter(muxc, 0, chan, 0);
if (ret)
goto err_children;
}
dev_info(dev, "%d-port mux on %s adapter\n", children, parent->name);
return 0;
err_children:
of_node_put(child);
i2c_mux_del_adapters(muxc);
err_parent:
i2c_put_adapter(parent);
return ret;
}
static void i2c_mux_remove(struct platform_device *pdev)
{
struct i2c_mux_core *muxc = platform_get_drvdata(pdev);
i2c_mux_del_adapters(muxc);
i2c_put_adapter(muxc->parent);
}
static struct platform_driver i2c_mux_driver = {
.probe = i2c_mux_probe,
.remove_new = i2c_mux_remove,
.driver = {
.name = "i2c-mux-gpmux",
.of_match_table = i2c_mux_of_match,
},
};
module_platform_driver(i2c_mux_driver);
MODULE_DESCRIPTION("General Purpose I2C multiplexer driver");
MODULE_AUTHOR("Peter Rosin <peda@axentia.se>");
MODULE_LICENSE("GPL v2");