1 // SPDX-License-Identifier: GPL-2.0
3  * GPIO-controlled multiplexer driver
12 #include <linux/gpio/consumer.h>
15 #include <linux/mux/driver.h>
23 static int mux_gpio_set(struct mux_control *mux, int state)  in mux_gpio_set()  argument
25 	struct mux_gpio *mux_gpio = mux_chip_priv(mux->chip);  in mux_gpio_set()
31 	gpiod_multi_set_value_cansleep(mux_gpio->gpios, values);  in mux_gpio_set()
41 	{ .compatible = "gpio-mux", },
48 	struct device *dev = &pdev->dev;  in mux_gpio_probe()
55 	pins = gpiod_count(dev, "mux");  in mux_gpio_probe()
64 	mux_chip->ops = &mux_gpio_ops;  in mux_gpio_probe()
66 	mux_gpio->gpios = devm_gpiod_get_array(dev, "mux", GPIOD_OUT_LOW);  in mux_gpio_probe()
67 	if (IS_ERR(mux_gpio->gpios))  in mux_gpio_probe()
68 		return dev_err_probe(dev, PTR_ERR(mux_gpio->gpios),  in mux_gpio_probe()
70 	WARN_ON(pins != mux_gpio->gpios->ndescs);  in mux_gpio_probe()
71 	mux_chip->mux->states = BIT(pins);  in mux_gpio_probe()
73 	ret = device_property_read_u32(dev, "idle-state", (u32 *)&idle_state);  in mux_gpio_probe()
75 		if (idle_state < 0 || idle_state >= mux_chip->mux->states) {  in mux_gpio_probe()
76 			dev_err(dev, "invalid idle-state %u\n", idle_state);  in mux_gpio_probe()
77 			return -EINVAL;  in mux_gpio_probe()
80 		mux_chip->mux->idle_state = idle_state;  in mux_gpio_probe()
87 	dev_info(dev, "%u-way mux-controller registered\n",  in mux_gpio_probe()
88 		 mux_chip->mux->states);  in mux_gpio_probe()
95 		.name = "gpio-mux",
102 MODULE_DESCRIPTION("GPIO-controlled multiplexer driver");