Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * GPIO-controlled multiplexer driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright (C) 2017 Axentia Technologies AB
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  * Author: Peter Rosin <peda@axentia.se>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10) #include <linux/err.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11) #include <linux/gpio/consumer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) #include <linux/mux/driver.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <linux/of_platform.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) #include <linux/property.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) struct mux_gpio {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19) 	struct gpio_descs *gpios;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) static int mux_gpio_set(struct mux_control *mux, int state)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 	struct mux_gpio *mux_gpio = mux_chip_priv(mux->chip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 	DECLARE_BITMAP(values, BITS_PER_TYPE(state));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 	values[0] = state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	gpiod_set_array_value_cansleep(mux_gpio->gpios->ndescs,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 				       mux_gpio->gpios->desc,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 				       mux_gpio->gpios->info, values);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) static const struct mux_control_ops mux_gpio_ops = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	.set = mux_gpio_set,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) static const struct of_device_id mux_gpio_dt_ids[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 	{ .compatible = "gpio-mux", },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 	{ /* sentinel */ }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) MODULE_DEVICE_TABLE(of, mux_gpio_dt_ids);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) static int mux_gpio_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 	struct device *dev = &pdev->dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 	struct mux_chip *mux_chip;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	struct mux_gpio *mux_gpio;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 	int pins;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	s32 idle_state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	pins = gpiod_count(dev, "mux");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	if (pins < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 		return pins;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	mux_chip = devm_mux_chip_alloc(dev, 1, sizeof(*mux_gpio));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	if (IS_ERR(mux_chip))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 		return PTR_ERR(mux_chip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	mux_gpio = mux_chip_priv(mux_chip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 	mux_chip->ops = &mux_gpio_ops;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 	mux_gpio->gpios = devm_gpiod_get_array(dev, "mux", GPIOD_OUT_LOW);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	if (IS_ERR(mux_gpio->gpios)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 		ret = PTR_ERR(mux_gpio->gpios);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 		if (ret != -EPROBE_DEFER)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 			dev_err(dev, "failed to get gpios\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) 	WARN_ON(pins != mux_gpio->gpios->ndescs);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	mux_chip->mux->states = 1 << pins;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	ret = device_property_read_u32(dev, "idle-state", (u32 *)&idle_state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	if (ret >= 0 && idle_state != MUX_IDLE_AS_IS) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 		if (idle_state < 0 || idle_state >= mux_chip->mux->states) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 			dev_err(dev, "invalid idle-state %u\n", idle_state);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 			return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 		}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 		mux_chip->mux->idle_state = idle_state;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 	ret = devm_mux_chip_register(dev, mux_chip);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	if (ret < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 		return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	dev_info(dev, "%u-way mux-controller registered\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 		 mux_chip->mux->states);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) static struct platform_driver mux_gpio_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) 	.driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 		.name = "gpio-mux",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) 		.of_match_table	= of_match_ptr(mux_gpio_dt_ids),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) 	},
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 	.probe = mux_gpio_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) module_platform_driver(mux_gpio_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) MODULE_DESCRIPTION("GPIO-controlled multiplexer driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) MODULE_AUTHOR("Peter Rosin <peda@axentia.se>");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) MODULE_LICENSE("GPL v2");