1 // SPDX-License-Identifier: GPL-2.0
3  * GPIO-controlled multiplexer driver
19 	struct gpio_descs *gpios;  member
25 	struct mux_gpio *mux_gpio = mux_chip_priv(mux->chip);  in mux_gpio_set()
28 	for (i = 0; i < mux_gpio->gpios->ndescs; i++)  in mux_gpio_set()
29 		mux_gpio->val[i] = (state >> i) & 1;  in mux_gpio_set()
31 	gpiod_set_array_value_cansleep(mux_gpio->gpios->ndescs,  in mux_gpio_set()
32 				       mux_gpio->gpios->desc,  in mux_gpio_set()
33 				       mux_gpio->val);  in mux_gpio_set()
43 	{ .compatible = "gpio-mux", },
50 	struct device *dev = &pdev->dev;  in mux_gpio_probe()
62 				       pins * sizeof(*mux_gpio->val));  in mux_gpio_probe()
67 	mux_gpio->val = (int *)(mux_gpio + 1);  in mux_gpio_probe()
68 	mux_chip->ops = &mux_gpio_ops;  in mux_gpio_probe()
70 	mux_gpio->gpios = devm_gpiod_get_array(dev, "mux", GPIOD_OUT_LOW);  in mux_gpio_probe()
71 	if (IS_ERR(mux_gpio->gpios)) {  in mux_gpio_probe()
72 		ret = PTR_ERR(mux_gpio->gpios);  in mux_gpio_probe()
73 		if (ret != -EPROBE_DEFER)  in mux_gpio_probe()
74 			dev_err(dev, "failed to get gpios\n");  in mux_gpio_probe()
77 	WARN_ON(pins != mux_gpio->gpios->ndescs);  in mux_gpio_probe()
78 	mux_chip->mux->states = 1 << pins;  in mux_gpio_probe()
80 	ret = device_property_read_u32(dev, "idle-state", (u32 *)&idle_state);  in mux_gpio_probe()
82 		if (idle_state < 0 || idle_state >= mux_chip->mux->states) {  in mux_gpio_probe()
83 			dev_err(dev, "invalid idle-state %u\n", idle_state);  in mux_gpio_probe()
84 			return -EINVAL;  in mux_gpio_probe()
87 		mux_chip->mux->idle_state = idle_state;  in mux_gpio_probe()
94 	dev_info(dev, "%u-way mux-controller registered\n",  in mux_gpio_probe()
95 		 mux_chip->mux->states);  in mux_gpio_probe()
102 		.name = "gpio-mux",
109 MODULE_DESCRIPTION("GPIO-controlled multiplexer driver");