1 // SPDX-License-Identifier: GPL-2.0-only
9 #include <linux/i2c-mux.h>
11 #include <linux/platform_data/i2c-mux-gpio.h>
21 	struct i2c_mux_gpio_platform_data data;  member
23 	struct gpio_desc **gpios;  member
32 	gpiod_set_array_value_cansleep(mux->ngpios, mux->gpios, NULL, values);  in i2c_mux_gpio_set()
48 	i2c_mux_gpio_set(mux, mux->data.idle);  in i2c_mux_gpio_deselect()
56 	struct device *dev = &pdev->dev;  in i2c_mux_gpio_probe_fw()
58 	struct device_node *np = dev->of_node;  in i2c_mux_gpio_probe_fw()
67 			return -ENODEV;  in i2c_mux_gpio_probe_fw()
69 		adapter_np = of_parse_phandle(np, "i2c-parent", 0);  in i2c_mux_gpio_probe_fw()
71 			dev_err(&pdev->dev, "Cannot parse i2c-parent\n");  in i2c_mux_gpio_probe_fw()
72 			return -ENODEV;  in i2c_mux_gpio_probe_fw()
82 		acpi_handle dev_handle = ACPI_HANDLE(dev->parent);  in i2c_mux_gpio_probe_fw()
88 		return -EPROBE_DEFER;  in i2c_mux_gpio_probe_fw()
90 	mux->data.parent = i2c_adapter_id(adapter);  in i2c_mux_gpio_probe_fw()
91 	put_device(&adapter->dev);  in i2c_mux_gpio_probe_fw()
93 	mux->data.n_values = device_get_child_node_count(dev);  in i2c_mux_gpio_probe_fw()
95 			      mux->data.n_values, sizeof(*mux->data.values),  in i2c_mux_gpio_probe_fw()
99 		return -ENOMEM;  in i2c_mux_gpio_probe_fw()
114 	mux->data.values = values;  in i2c_mux_gpio_probe_fw()
116 	if (device_property_read_u32(dev, "idle-state", &mux->data.idle))  in i2c_mux_gpio_probe_fw()
117 		mux->data.idle = I2C_MUX_GPIO_NO_IDLE;  in i2c_mux_gpio_probe_fw()
131 	mux = devm_kzalloc(&pdev->dev, sizeof(*mux), GFP_KERNEL);  in i2c_mux_gpio_probe()
133 		return -ENOMEM;  in i2c_mux_gpio_probe()
135 	if (!dev_get_platdata(&pdev->dev)) {  in i2c_mux_gpio_probe()
140 		memcpy(&mux->data, dev_get_platdata(&pdev->dev),  in i2c_mux_gpio_probe()
141 			sizeof(mux->data));  in i2c_mux_gpio_probe()
144 	ngpios = gpiod_count(&pdev->dev, "mux");  in i2c_mux_gpio_probe()
146 		dev_err(&pdev->dev, "no valid gpios provided\n");  in i2c_mux_gpio_probe()
147 		return ngpios ?: -EINVAL;  in i2c_mux_gpio_probe()
149 	mux->ngpios = ngpios;  in i2c_mux_gpio_probe()
151 	parent = i2c_get_adapter(mux->data.parent);  in i2c_mux_gpio_probe()
153 		return -EPROBE_DEFER;  in i2c_mux_gpio_probe()
155 	muxc = i2c_mux_alloc(parent, &pdev->dev, mux->data.n_values,  in i2c_mux_gpio_probe()
156 			     array_size(ngpios, sizeof(*mux->gpios)), 0,  in i2c_mux_gpio_probe()
159 		ret = -ENOMEM;  in i2c_mux_gpio_probe()
162 	mux->gpios = muxc->priv;  in i2c_mux_gpio_probe()
163 	muxc->priv = mux;  in i2c_mux_gpio_probe()
167 	root = i2c_root_adapter(&parent->dev);  in i2c_mux_gpio_probe()
169 	muxc->mux_locked = true;  in i2c_mux_gpio_probe()
171 	if (mux->data.idle != I2C_MUX_GPIO_NO_IDLE) {  in i2c_mux_gpio_probe()
172 		initial_state = mux->data.idle;  in i2c_mux_gpio_probe()
173 		muxc->deselect = i2c_mux_gpio_deselect;  in i2c_mux_gpio_probe()
175 		initial_state = mux->data.values[0];  in i2c_mux_gpio_probe()
187 		gpiod = devm_gpiod_get_index(&pdev->dev, "mux", i, flag);  in i2c_mux_gpio_probe()
193 		mux->gpios[i] = gpiod;  in i2c_mux_gpio_probe()
195 		if (!muxc->mux_locked)  in i2c_mux_gpio_probe()
199 		gpio_dev = &gpiod->gdev->dev;  in i2c_mux_gpio_probe()
200 		muxc->mux_locked = i2c_root_adapter(gpio_dev) == root;  in i2c_mux_gpio_probe()
203 	if (muxc->mux_locked)  in i2c_mux_gpio_probe()
204 		dev_info(&pdev->dev, "mux-locked i2c mux\n");  in i2c_mux_gpio_probe()
206 	for (i = 0; i < mux->data.n_values; i++) {  in i2c_mux_gpio_probe()
207 		u32 nr = mux->data.base_nr ? (mux->data.base_nr + i) : 0;  in i2c_mux_gpio_probe()
208 		unsigned int class = mux->data.classes ? mux->data.classes[i] : 0;  in i2c_mux_gpio_probe()
210 		ret = i2c_mux_add_adapter(muxc, nr, mux->data.values[i], class);  in i2c_mux_gpio_probe()
215 	dev_info(&pdev->dev, "%d port mux on %s adapter\n",  in i2c_mux_gpio_probe()
216 		 mux->data.n_values, parent->name);  in i2c_mux_gpio_probe()
233 	i2c_put_adapter(muxc->parent);  in i2c_mux_gpio_remove()
239 	{ .compatible = "i2c-mux-gpio", },
248 		.name	= "i2c-mux-gpio",
255 MODULE_DESCRIPTION("GPIO-based I2C multiplexer driver");
258 MODULE_ALIAS("platform:i2c-mux-gpio");