1 // SPDX-License-Identifier: GPL-2.0-only
3  * I2C multiplexer using pinctrl API
8 #include <linux/i2c.h>
9 #include <linux/i2c-mux.h>
24 	struct i2c_mux_pinctrl *mux = i2c_mux_priv(muxc);  in i2c_mux_pinctrl_select()  local
26 	return pinctrl_select_state(mux->pinctrl, mux->states[chan]);  in i2c_mux_pinctrl_select()
31 	return i2c_mux_pinctrl_select(muxc, muxc->num_adapters);  in i2c_mux_pinctrl_deselect()
41 	list_for_each_entry(setting, &state->settings, node) {  in i2c_mux_pinctrl_root_adapter()
42 		pin_root = i2c_root_adapter(setting->pctldev->dev);  in i2c_mux_pinctrl_root_adapter()
56 	struct device_node *np = dev->of_node;  in i2c_mux_pinctrl_parent_adapter()
60 	parent_np = of_parse_phandle(np, "i2c-parent", 0);  in i2c_mux_pinctrl_parent_adapter()
62 		dev_err(dev, "Cannot parse i2c-parent\n");  in i2c_mux_pinctrl_parent_adapter()
63 		return ERR_PTR(-ENODEV);  in i2c_mux_pinctrl_parent_adapter()
68 		return ERR_PTR(-EPROBE_DEFER);  in i2c_mux_pinctrl_parent_adapter()
75 	struct device *dev = &pdev->dev;  in i2c_mux_pinctrl_probe()
76 	struct device_node *np = dev->of_node;  in i2c_mux_pinctrl_probe()
78 	struct i2c_mux_pinctrl *mux;  in i2c_mux_pinctrl_probe()  local
84 	num_names = of_property_count_strings(np, "pinctrl-names");  in i2c_mux_pinctrl_probe()
86 		dev_err(dev, "Cannot parse pinctrl-names: %d\n",  in i2c_mux_pinctrl_probe()
96 			     struct_size(mux, states, num_names),  in i2c_mux_pinctrl_probe()
99 		ret = -ENOMEM;  in i2c_mux_pinctrl_probe()
102 	mux = i2c_mux_priv(muxc);  in i2c_mux_pinctrl_probe()
106 	mux->pinctrl = devm_pinctrl_get(dev);  in i2c_mux_pinctrl_probe()
107 	if (IS_ERR(mux->pinctrl)) {  in i2c_mux_pinctrl_probe()
108 		ret = PTR_ERR(mux->pinctrl);  in i2c_mux_pinctrl_probe()
114 		ret = of_property_read_string_index(np, "pinctrl-names", i,  in i2c_mux_pinctrl_probe()
117 			dev_err(dev, "Cannot parse pinctrl-names: %d\n", ret);  in i2c_mux_pinctrl_probe()
121 		mux->states[i] = pinctrl_lookup_state(mux->pinctrl, name);  in i2c_mux_pinctrl_probe()
122 		if (IS_ERR(mux->states[i])) {  in i2c_mux_pinctrl_probe()
123 			ret = PTR_ERR(mux->states[i]);  in i2c_mux_pinctrl_probe()
132 		if (i != num_names - 1) {  in i2c_mux_pinctrl_probe()
134 			ret = -EINVAL;  in i2c_mux_pinctrl_probe()
137 		muxc->deselect = i2c_mux_pinctrl_deselect;  in i2c_mux_pinctrl_probe()
140 	root = i2c_root_adapter(&muxc->parent->dev);  in i2c_mux_pinctrl_probe()
142 	muxc->mux_locked = true;  in i2c_mux_pinctrl_probe()
144 		if (root != i2c_mux_pinctrl_root_adapter(mux->states[i])) {  in i2c_mux_pinctrl_probe()
145 			muxc->mux_locked = false;  in i2c_mux_pinctrl_probe()
149 	if (muxc->mux_locked)  in i2c_mux_pinctrl_probe()
150 		dev_info(dev, "mux-locked i2c mux\n");  in i2c_mux_pinctrl_probe()
153 	for (i = 0; i < num_names - !!muxc->deselect; i++) {  in i2c_mux_pinctrl_probe()
174 	i2c_put_adapter(muxc->parent);  in i2c_mux_pinctrl_remove()
178 	{ .compatible = "i2c-mux-pinctrl", },
185 		.name	= "i2c-mux-pinctrl",
193 MODULE_DESCRIPTION("pinctrl-based I2C multiplexer driver");
196 MODULE_ALIAS("platform:i2c-mux-pinctrl");