1 // SPDX-License-Identifier: GPL-2.0-only
3  * General Purpose I2C multiplexer
10 #include <linux/i2c.h>
11 #include <linux/i2c-mux.h>
13 #include <linux/mux/consumer.h>
17 struct mux {  struct
25 	struct mux *mux = i2c_mux_priv(muxc);  in i2c_mux_select()  local
28 	ret = mux_control_select(mux->control, chan);  in i2c_mux_select()
29 	mux->do_not_deselect = ret < 0;  in i2c_mux_select()
36 	struct mux *mux = i2c_mux_priv(muxc);  in i2c_mux_deselect()  local
38 	if (mux->do_not_deselect)  in i2c_mux_deselect()
41 	return mux_control_deselect(mux->control);  in i2c_mux_deselect()
46 	struct device_node *np = dev->of_node;  in mux_parent_adapter()
50 	parent_np = of_parse_phandle(np, "i2c-parent", 0);  in mux_parent_adapter()
52 		dev_err(dev, "Cannot parse i2c-parent\n");  in mux_parent_adapter()
53 		return ERR_PTR(-ENODEV);  in mux_parent_adapter()
58 		return ERR_PTR(-EPROBE_DEFER);  in mux_parent_adapter()
64 	{ .compatible = "i2c-mux", },
71 	struct device *dev = &pdev->dev;  in i2c_mux_probe()
72 	struct device_node *np = dev->of_node;  in i2c_mux_probe()
75 	struct mux *mux;  in i2c_mux_probe()  local
81 		return -ENODEV;  in i2c_mux_probe()
83 	mux = devm_kzalloc(dev, sizeof(*mux), GFP_KERNEL);  in i2c_mux_probe()
84 	if (!mux)  in i2c_mux_probe()
85 		return -ENOMEM;  in i2c_mux_probe()
87 	mux->control = devm_mux_control_get(dev, NULL);  in i2c_mux_probe()
88 	if (IS_ERR(mux->control))  in i2c_mux_probe()
89 		return dev_err_probe(dev, PTR_ERR(mux->control),  in i2c_mux_probe()
90 				     "failed to get control-mux\n");  in i2c_mux_probe()
95 				     "failed to get i2c-parent adapter\n");  in i2c_mux_probe()
102 		ret = -ENOMEM;  in i2c_mux_probe()
105 	muxc->priv = mux;  in i2c_mux_probe()
109 	muxc->mux_locked = of_property_read_bool(np, "mux-locked");  in i2c_mux_probe()
121 		if (chan >= mux_control_states(mux->control)) {  in i2c_mux_probe()
123 			ret = -EINVAL;  in i2c_mux_probe()
132 	dev_info(dev, "%d-port mux on %s adapter\n", children, parent->name);  in i2c_mux_probe()
150 	i2c_put_adapter(muxc->parent);  in i2c_mux_remove()
157 		.name	= "i2c-mux-gpmux",
163 MODULE_DESCRIPTION("General Purpose I2C multiplexer driver");