packages: kernel: add gpio-nxp-74hc153
NXP 74HC153 is a GPIO expander. Its original source cide sits in ar71xx architecture tree. It has been slightly modified to get GPIO pin configuration from the device tree rather than a MACH file. Changes to the source file: - Remove struct nxp_74hc153_config - in nxp_74hc153_probe(), fetch GPIO configuration from device tree - allow GPIO framework decide the base number by passing -1 to it - remove support for kernel versions below 4.5.0 - add OF device compatibility string Create a package for inclusion in image. References: https://lore.kernel.org/linux-gpio/545111184.50061.1615922388276@ichabod.co-bxl/ Signed-off-by: Mauri Sandberg <sandberg@mailfence.com> [added link to driver usptreaming work in progress] Signed-off-by: Petr Štetiar <ynezz@true.cz>
This commit is contained in:
Mauri Sandberg
Petr Štetiar
parent
a49fd9db0a
commit
6a6f9e73dd
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#
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# Copyright (C) 2020 Mauri Sandberg <sandberg@mailfence.com>
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#
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# This is free software, licensed under the GNU General Public License v2.
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# See /LICENSE for more information.
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#
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include $(TOPDIR)/rules.mk
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include $(INCLUDE_DIR)/kernel.mk
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PKG_NAME:=gpio-nxp-74hc153
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PKG_RELEASE:=1
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PKG_LICENSE:=GPL-2.0
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include $(INCLUDE_DIR)/package.mk
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define KernelPackage/gpio-nxp-74hc153
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SUBMENU:=Other modules
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TITLE:= NXP 74HC153 GPIO expander
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FILES:=$(PKG_BUILD_DIR)/gpio-nxp-74hc153.ko
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AUTOLOAD:=$(call AutoLoad,30,gpio-nxp-74hc153,1)
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KCONFIG:=
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DEPENDS:= @GPIO_SUPPORT @TARGET_ath79
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endef
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define KernelPackage/gpio-nxp-74hc153/description
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Platform driver for NXP 74HC153 Dual 4-input Multiplexer.
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This provides a GPIO interface supporting input mode only.
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endef
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define Build/Compile
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$(KERNEL_MAKE) M=$(PKG_BUILD_DIR) modules
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endef
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$(eval $(call KernelPackage,gpio-nxp-74hc153))
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obj-m += gpio-nxp-74hc153.o
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/*
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* NXP 74HC153 - Dual 4-input multiplexer GPIO driver
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*
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* Copyright (C) 2010 Gabor Juhos <juhosg@openwrt.org>
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* Copyright (C) 2020 Mauri Sandberg <sandberg@mailfence.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Example device tree definition:
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*
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* gpio-extender {
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* compatible = "nxp,74hc153-gpio";
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* gpio-controller;
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* #gpio-cells = <2>;
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*
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* // GPIOs used by this node
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* gpio-s0 = <&gpio 9 GPIO_ACTIVE_HIGH>;
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* gpio-s1 = <&gpio 11 GPIO_ACTIVE_HIGH>;
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* gpio-1y = <&gpio 12 GPIO_ACTIVE_HIGH>;
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* gpio-2y = <&gpio 14 GPIO_ACTIVE_HIGH>;
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* };
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*
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*/
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#include <linux/version.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/gpio.h>
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#include <linux/slab.h>
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#include <linux/platform_device.h>
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#include <linux/of_gpio.h>
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#define NXP_74HC153_NUM_GPIOS 8
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#define NXP_74HC153_S0_MASK 0x1
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#define NXP_74HC153_S1_MASK 0x2
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#define NXP_74HC153_BANK_MASK 0x4
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#define NXP_74HC153_DRIVER_NAME "nxp-74hc153"
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struct nxp_74hc153_config {
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unsigned gpio_pin_s0;
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unsigned gpio_pin_s1;
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unsigned gpio_pin_1y;
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unsigned gpio_pin_2y;
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};
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struct nxp_74hc153_chip {
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struct device *parent;
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struct gpio_chip gpio_chip;
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struct mutex lock;
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struct nxp_74hc153_config config;
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};
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static struct nxp_74hc153_chip *gpio_to_nxp(struct gpio_chip *gc)
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{
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return container_of(gc, struct nxp_74hc153_chip, gpio_chip);
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}
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static int nxp_74hc153_direction_input(struct gpio_chip *gc, unsigned offset)
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{
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return 0;
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}
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static int nxp_74hc153_direction_output(struct gpio_chip *gc,
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unsigned offset, int val)
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{
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return -EINVAL;
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}
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static int nxp_74hc153_get_value(struct gpio_chip *gc, unsigned offset)
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{
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struct nxp_74hc153_chip *nxp;
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struct nxp_74hc153_platform_data *pdata;
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unsigned s0;
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unsigned s1;
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unsigned pin;
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int ret;
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nxp = gpio_to_nxp(gc);
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pdata = nxp->parent->platform_data;
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s0 = !!(offset & NXP_74HC153_S0_MASK);
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s1 = !!(offset & NXP_74HC153_S1_MASK);
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pin = (offset & NXP_74HC153_BANK_MASK) ? nxp->config.gpio_pin_2y
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: nxp->config.gpio_pin_1y;
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mutex_lock(&nxp->lock);
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gpio_set_value(nxp->config.gpio_pin_s0, s0);
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gpio_set_value(nxp->config.gpio_pin_s1, s1);
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ret = gpio_get_value(pin);
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mutex_unlock(&nxp->lock);
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return ret;
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}
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static void nxp_74hc153_set_value(struct gpio_chip *gc,
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unsigned offset, int val)
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{
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/* not supported */
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}
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static int nxp_74hc153_probe(struct platform_device *pdev)
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{
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struct device_node *np = pdev->dev.of_node;
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struct nxp_74hc153_chip *nxp;
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struct gpio_chip *gc;
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int err;
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unsigned gpio_s0;
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unsigned gpio_s1;
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unsigned gpio_1y;
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unsigned gpio_2y;
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nxp = kzalloc(sizeof(struct nxp_74hc153_chip), GFP_KERNEL);
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if (nxp == NULL) {
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dev_err(&pdev->dev, "no memory for private data\n");
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return -ENOMEM;
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}
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gpio_s0 = of_get_named_gpio(np, "gpio-s0", 0);
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gpio_s1 = of_get_named_gpio(np, "gpio-s1", 0);
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gpio_1y = of_get_named_gpio(np, "gpio-1y", 0);
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gpio_2y = of_get_named_gpio(np, "gpio-2y", 0);
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if (!gpio_is_valid(gpio_s0) || !gpio_is_valid(gpio_s1) ||
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!gpio_is_valid(gpio_1y) || !gpio_is_valid(gpio_2y)) {
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dev_err(&pdev->dev, "control GPIO(s) are missing\n");
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err = -EINVAL;
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goto err_free_nxp;
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} else {
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nxp->config.gpio_pin_s0 = gpio_s0;
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nxp->config.gpio_pin_s1 = gpio_s1;
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nxp->config.gpio_pin_1y = gpio_1y;
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nxp->config.gpio_pin_2y = gpio_2y;
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}
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// apply pin configuration
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err = gpio_request(nxp->config.gpio_pin_s0, dev_name(&pdev->dev));
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if (err) {
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dev_err(&pdev->dev, "unable to claim gpio %u, err=%d\n",
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nxp->config.gpio_pin_s0, err);
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goto err_free_nxp;
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}
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err = gpio_request(nxp->config.gpio_pin_s1, dev_name(&pdev->dev));
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if (err) {
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dev_err(&pdev->dev, "unable to claim gpio %u, err=%d\n",
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nxp->config.gpio_pin_s1, err);
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goto err_free_s0;
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}
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err = gpio_request(nxp->config.gpio_pin_1y, dev_name(&pdev->dev));
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if (err) {
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dev_err(&pdev->dev, "unable to claim gpio %u, err=%d\n",
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nxp->config.gpio_pin_1y, err);
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goto err_free_s1;
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}
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err = gpio_request(nxp->config.gpio_pin_2y, dev_name(&pdev->dev));
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if (err) {
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dev_err(&pdev->dev, "unable to claim gpio %u, err=%d\n",
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nxp->config.gpio_pin_2y, err);
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goto err_free_1y;
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}
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err = gpio_direction_output(nxp->config.gpio_pin_s0, 0);
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if (err) {
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dev_err(&pdev->dev,
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"unable to set direction of gpio %u, err=%d\n",
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nxp->config.gpio_pin_s0, err);
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goto err_free_2y;
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}
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err = gpio_direction_output(nxp->config.gpio_pin_s1, 0);
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if (err) {
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dev_err(&pdev->dev,
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"unable to set direction of gpio %u, err=%d\n",
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nxp->config.gpio_pin_s1, err);
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goto err_free_2y;
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}
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err = gpio_direction_input(nxp->config.gpio_pin_1y);
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if (err) {
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dev_err(&pdev->dev,
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"unable to set direction of gpio %u, err=%d\n",
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nxp->config.gpio_pin_1y, err);
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goto err_free_2y;
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}
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err = gpio_direction_input(nxp->config.gpio_pin_2y);
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if (err) {
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dev_err(&pdev->dev,
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"unable to set direction of gpio %u, err=%d\n",
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nxp->config.gpio_pin_2y, err);
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goto err_free_2y;
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}
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nxp->parent = &pdev->dev;
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mutex_init(&nxp->lock);
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gc = &nxp->gpio_chip;
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gc->direction_input = nxp_74hc153_direction_input;
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gc->direction_output = nxp_74hc153_direction_output;
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gc->get = nxp_74hc153_get_value;
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gc->set = nxp_74hc153_set_value;
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gc->can_sleep = 1;
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gc->base = -1;
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gc->ngpio = NXP_74HC153_NUM_GPIOS;
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gc->label = dev_name(nxp->parent);
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gc->parent = nxp->parent;
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gc->owner = THIS_MODULE;
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gc->of_node = np;
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err = gpiochip_add(&nxp->gpio_chip);
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if (err) {
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dev_err(&pdev->dev, "unable to add gpio chip, err=%d\n", err);
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goto err_free_2y;
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}
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platform_set_drvdata(pdev, nxp);
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return 0;
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err_free_2y:
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gpio_free(nxp->config.gpio_pin_2y);
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err_free_1y:
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gpio_free(nxp->config.gpio_pin_1y);
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err_free_s1:
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gpio_free(nxp->config.gpio_pin_s1);
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err_free_s0:
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gpio_free(nxp->config.gpio_pin_s0);
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err_free_nxp:
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kfree(nxp);
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return err;
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}
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static int nxp_74hc153_remove(struct platform_device *pdev)
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{
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struct nxp_74hc153_chip *nxp = platform_get_drvdata(pdev);
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if (nxp) {
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gpiochip_remove(&nxp->gpio_chip);
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gpio_free(nxp->config.gpio_pin_2y);
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gpio_free(nxp->config.gpio_pin_1y);
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gpio_free(nxp->config.gpio_pin_s1);
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gpio_free(nxp->config.gpio_pin_s0);
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kfree(nxp);
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platform_set_drvdata(pdev, NULL);
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}
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return 0;
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}
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static struct of_device_id nxp_74hc153_id[] = {
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{
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.compatible = "nxp,74hc153-gpio",
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.data = NULL,
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}, { /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(of, nxp_74hc153_id);
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static struct platform_driver nxp_74hc153_driver = {
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.probe = nxp_74hc153_probe,
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.remove = nxp_74hc153_remove,
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.driver = {
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.name = NXP_74HC153_DRIVER_NAME,
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.owner = THIS_MODULE,
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.of_match_table = nxp_74hc153_id,
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},
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};
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static int __init nxp_74hc153_init(void)
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{
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return platform_driver_register(&nxp_74hc153_driver);
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}
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subsys_initcall(nxp_74hc153_init);
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static void __exit nxp_74hc153_exit(void)
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{
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platform_driver_unregister(&nxp_74hc153_driver);
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}
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module_exit(nxp_74hc153_exit);
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MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
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MODULE_DESCRIPTION("GPIO expander driver for NXP 74HC153");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("platform:" NXP_74HC153_DRIVER_NAME);
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