1 // SPDX-License-Identifier: GPL-2.0-only
9 #include <linux/i2c-mux.h>
10 #include <linux/platform_data/i2c-mux-gpio.h>
22 	struct gpio_desc **gpios;  member
31 	gpiod_set_array_value_cansleep(mux->ngpios, mux->gpios, NULL, values);  in i2c_mux_gpio_set()
47 	i2c_mux_gpio_set(mux, mux->data.idle);  in i2c_mux_gpio_deselect()
56 	struct device_node *np = pdev->dev.of_node;  in i2c_mux_gpio_probe_dt()
63 		return -ENODEV;  in i2c_mux_gpio_probe_dt()
65 	adapter_np = of_parse_phandle(np, "i2c-parent", 0);  in i2c_mux_gpio_probe_dt()
67 		dev_err(&pdev->dev, "Cannot parse i2c-parent\n");  in i2c_mux_gpio_probe_dt()
68 		return -ENODEV;  in i2c_mux_gpio_probe_dt()
73 		return -EPROBE_DEFER;  in i2c_mux_gpio_probe_dt()
75 	mux->data.parent = i2c_adapter_id(adapter);  in i2c_mux_gpio_probe_dt()
76 	put_device(&adapter->dev);  in i2c_mux_gpio_probe_dt()
78 	mux->data.n_values = of_get_child_count(np);  in i2c_mux_gpio_probe_dt()
80 	values = devm_kcalloc(&pdev->dev,  in i2c_mux_gpio_probe_dt()
81 			      mux->data.n_values, sizeof(*mux->data.values),  in i2c_mux_gpio_probe_dt()
84 		dev_err(&pdev->dev, "Cannot allocate values array");  in i2c_mux_gpio_probe_dt()
85 		return -ENOMEM;  in i2c_mux_gpio_probe_dt()
92 	mux->data.values = values;  in i2c_mux_gpio_probe_dt()
94 	if (of_property_read_u32(np, "idle-state", &mux->data.idle))  in i2c_mux_gpio_probe_dt()
95 		mux->data.idle = I2C_MUX_GPIO_NO_IDLE;  in i2c_mux_gpio_probe_dt()
116 	mux = devm_kzalloc(&pdev->dev, sizeof(*mux), GFP_KERNEL);  in i2c_mux_gpio_probe()
118 		return -ENOMEM;  in i2c_mux_gpio_probe()
120 	if (!dev_get_platdata(&pdev->dev)) {  in i2c_mux_gpio_probe()
125 		memcpy(&mux->data, dev_get_platdata(&pdev->dev),  in i2c_mux_gpio_probe()
126 			sizeof(mux->data));  in i2c_mux_gpio_probe()
129 	ngpios = gpiod_count(&pdev->dev, "mux");  in i2c_mux_gpio_probe()
131 		dev_err(&pdev->dev, "no valid gpios provided\n");  in i2c_mux_gpio_probe()
132 		return ngpios ?: -EINVAL;  in i2c_mux_gpio_probe()
134 	mux->ngpios = ngpios;  in i2c_mux_gpio_probe()
136 	parent = i2c_get_adapter(mux->data.parent);  in i2c_mux_gpio_probe()
138 		return -EPROBE_DEFER;  in i2c_mux_gpio_probe()
140 	muxc = i2c_mux_alloc(parent, &pdev->dev, mux->data.n_values,  in i2c_mux_gpio_probe()
141 			     ngpios * sizeof(*mux->gpios), 0,  in i2c_mux_gpio_probe()
144 		ret = -ENOMEM;  in i2c_mux_gpio_probe()
147 	mux->gpios = muxc->priv;  in i2c_mux_gpio_probe()
148 	muxc->priv = mux;  in i2c_mux_gpio_probe()
152 	root = i2c_root_adapter(&parent->dev);  in i2c_mux_gpio_probe()
154 	muxc->mux_locked = true;  in i2c_mux_gpio_probe()
156 	if (mux->data.idle != I2C_MUX_GPIO_NO_IDLE) {  in i2c_mux_gpio_probe()
157 		initial_state = mux->data.idle;  in i2c_mux_gpio_probe()
158 		muxc->deselect = i2c_mux_gpio_deselect;  in i2c_mux_gpio_probe()
160 		initial_state = mux->data.values[0];  in i2c_mux_gpio_probe()
172 		gpiod = devm_gpiod_get_index(&pdev->dev, "mux", i, flag);  in i2c_mux_gpio_probe()
178 		mux->gpios[i] = gpiod;  in i2c_mux_gpio_probe()
180 		if (!muxc->mux_locked)  in i2c_mux_gpio_probe()
184 		gpio_dev = &gpiod->gdev->dev;  in i2c_mux_gpio_probe()
185 		muxc->mux_locked = i2c_root_adapter(gpio_dev) == root;  in i2c_mux_gpio_probe()
188 	if (muxc->mux_locked)  in i2c_mux_gpio_probe()
189 		dev_info(&pdev->dev, "mux-locked i2c mux\n");  in i2c_mux_gpio_probe()
191 	for (i = 0; i < mux->data.n_values; i++) {  in i2c_mux_gpio_probe()
192 		u32 nr = mux->data.base_nr ? (mux->data.base_nr + i) : 0;  in i2c_mux_gpio_probe()  local
193 		unsigned int class = mux->data.classes ? mux->data.classes[i] : 0;  in i2c_mux_gpio_probe()
195 		ret = i2c_mux_add_adapter(muxc, nr, mux->data.values[i], class);  in i2c_mux_gpio_probe()
200 	dev_info(&pdev->dev, "%d port mux on %s adapter\n",  in i2c_mux_gpio_probe()
201 		 mux->data.n_values, parent->name);  in i2c_mux_gpio_probe()
218 	i2c_put_adapter(muxc->parent);  in i2c_mux_gpio_remove()
224 	{ .compatible = "i2c-mux-gpio", },
233 		.name	= "i2c-mux-gpio",
240 MODULE_DESCRIPTION("GPIO-based I2C multiplexer driver");
243 MODULE_ALIAS("platform:i2c-mux-gpio");