2  * General Purpose I2C multiplexer
13 #include <linux/i2c.h>
14 #include <linux/i2c-mux.h>
16 #include <linux/mux/consumer.h>
20 struct mux {  struct
28 	struct mux *mux = i2c_mux_priv(muxc);  in i2c_mux_select()  local
31 	ret = mux_control_select(mux->control, chan);  in i2c_mux_select()
32 	mux->do_not_deselect = ret < 0;  in i2c_mux_select()
39 	struct mux *mux = i2c_mux_priv(muxc);  in i2c_mux_deselect()  local
41 	if (mux->do_not_deselect)  in i2c_mux_deselect()
44 	return mux_control_deselect(mux->control);  in i2c_mux_deselect()
49 	struct device_node *np = dev->of_node;  in mux_parent_adapter()
53 	parent_np = of_parse_phandle(np, "i2c-parent", 0);  in mux_parent_adapter()
55 		dev_err(dev, "Cannot parse i2c-parent\n");  in mux_parent_adapter()
56 		return ERR_PTR(-ENODEV);  in mux_parent_adapter()
61 		return ERR_PTR(-EPROBE_DEFER);  in mux_parent_adapter()
67 	{ .compatible = "i2c-mux", },
74 	struct device *dev = &pdev->dev;  in i2c_mux_probe()
75 	struct device_node *np = dev->of_node;  in i2c_mux_probe()
78 	struct mux *mux;  in i2c_mux_probe()  local
84 		return -ENODEV;  in i2c_mux_probe()
86 	mux = devm_kzalloc(dev, sizeof(*mux), GFP_KERNEL);  in i2c_mux_probe()
87 	if (!mux)  in i2c_mux_probe()
88 		return -ENOMEM;  in i2c_mux_probe()
90 	mux->control = devm_mux_control_get(dev, NULL);  in i2c_mux_probe()
91 	if (IS_ERR(mux->control)) {  in i2c_mux_probe()
92 		if (PTR_ERR(mux->control) != -EPROBE_DEFER)  in i2c_mux_probe()
93 			dev_err(dev, "failed to get control-mux\n");  in i2c_mux_probe()
94 		return PTR_ERR(mux->control);  in i2c_mux_probe()
99 		if (PTR_ERR(parent) != -EPROBE_DEFER)  in i2c_mux_probe()
100 			dev_err(dev, "failed to get i2c-parent adapter\n");  in i2c_mux_probe()
109 		ret = -ENOMEM;  in i2c_mux_probe()
112 	muxc->priv = mux;  in i2c_mux_probe()
116 	muxc->mux_locked = of_property_read_bool(np, "mux-locked");  in i2c_mux_probe()
124 				child->name);  in i2c_mux_probe()
128 		if (chan >= mux_control_states(mux->control)) {  in i2c_mux_probe()
130 			ret = -EINVAL;  in i2c_mux_probe()
139 	dev_info(dev, "%d-port mux on %s adapter\n", children, parent->name);  in i2c_mux_probe()
156 	i2c_put_adapter(muxc->parent);  in i2c_mux_remove()
165 		.name	= "i2c-mux-gpmux",
171 MODULE_DESCRIPTION("General Purpose I2C multiplexer driver");