mirror of
git://git.openwrt.org/openwrt/openwrt.git
synced 2024-12-26 16:42:47 +00:00
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
35
package/kernel/gpio-nxp-74hc153/Makefile
Normal file
35
package/kernel/gpio-nxp-74hc153/Makefile
Normal file
@ -0,0 +1,35 @@
|
||||
#
|
||||
# Copyright (C) 2020 Mauri Sandberg <sandberg@mailfence.com>
|
||||
#
|
||||
# This is free software, licensed under the GNU General Public License v2.
|
||||
# See /LICENSE for more information.
|
||||
#
|
||||
|
||||
include $(TOPDIR)/rules.mk
|
||||
include $(INCLUDE_DIR)/kernel.mk
|
||||
|
||||
PKG_NAME:=gpio-nxp-74hc153
|
||||
PKG_RELEASE:=1
|
||||
PKG_LICENSE:=GPL-2.0
|
||||
|
||||
include $(INCLUDE_DIR)/package.mk
|
||||
|
||||
define KernelPackage/gpio-nxp-74hc153
|
||||
SUBMENU:=Other modules
|
||||
TITLE:= NXP 74HC153 GPIO expander
|
||||
FILES:=$(PKG_BUILD_DIR)/gpio-nxp-74hc153.ko
|
||||
AUTOLOAD:=$(call AutoLoad,30,gpio-nxp-74hc153,1)
|
||||
KCONFIG:=
|
||||
DEPENDS:= @GPIO_SUPPORT @TARGET_ath79
|
||||
endef
|
||||
|
||||
define KernelPackage/gpio-nxp-74hc153/description
|
||||
Platform driver for NXP 74HC153 Dual 4-input Multiplexer.
|
||||
This provides a GPIO interface supporting input mode only.
|
||||
endef
|
||||
|
||||
define Build/Compile
|
||||
$(KERNEL_MAKE) M=$(PKG_BUILD_DIR) modules
|
||||
endef
|
||||
|
||||
$(eval $(call KernelPackage,gpio-nxp-74hc153))
|
||||
1
package/kernel/gpio-nxp-74hc153/src/Makefile
Normal file
1
package/kernel/gpio-nxp-74hc153/src/Makefile
Normal file
@ -0,0 +1 @@
|
||||
obj-m += gpio-nxp-74hc153.o
|
||||
291
package/kernel/gpio-nxp-74hc153/src/gpio-nxp-74hc153.c
Normal file
291
package/kernel/gpio-nxp-74hc153/src/gpio-nxp-74hc153.c
Normal file
@ -0,0 +1,291 @@
|
||||
/*
|
||||
* NXP 74HC153 - Dual 4-input multiplexer GPIO driver
|
||||
*
|
||||
* Copyright (C) 2010 Gabor Juhos <juhosg@openwrt.org>
|
||||
* Copyright (C) 2020 Mauri Sandberg <sandberg@mailfence.com>
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License version 2 as
|
||||
* published by the Free Software Foundation.
|
||||
*
|
||||
* Example device tree definition:
|
||||
*
|
||||
* gpio-extender {
|
||||
* compatible = "nxp,74hc153-gpio";
|
||||
* gpio-controller;
|
||||
* #gpio-cells = <2>;
|
||||
*
|
||||
* // GPIOs used by this node
|
||||
* gpio-s0 = <&gpio 9 GPIO_ACTIVE_HIGH>;
|
||||
* gpio-s1 = <&gpio 11 GPIO_ACTIVE_HIGH>;
|
||||
* gpio-1y = <&gpio 12 GPIO_ACTIVE_HIGH>;
|
||||
* gpio-2y = <&gpio 14 GPIO_ACTIVE_HIGH>;
|
||||
* };
|
||||
*
|
||||
*/
|
||||
|
||||
#include <linux/version.h>
|
||||
#include <linux/module.h>
|
||||
#include <linux/init.h>
|
||||
#include <linux/gpio.h>
|
||||
#include <linux/slab.h>
|
||||
#include <linux/platform_device.h>
|
||||
#include <linux/of_gpio.h>
|
||||
|
||||
#define NXP_74HC153_NUM_GPIOS 8
|
||||
#define NXP_74HC153_S0_MASK 0x1
|
||||
#define NXP_74HC153_S1_MASK 0x2
|
||||
#define NXP_74HC153_BANK_MASK 0x4
|
||||
|
||||
#define NXP_74HC153_DRIVER_NAME "nxp-74hc153"
|
||||
|
||||
struct nxp_74hc153_config {
|
||||
unsigned gpio_pin_s0;
|
||||
unsigned gpio_pin_s1;
|
||||
unsigned gpio_pin_1y;
|
||||
unsigned gpio_pin_2y;
|
||||
};
|
||||
|
||||
struct nxp_74hc153_chip {
|
||||
struct device *parent;
|
||||
struct gpio_chip gpio_chip;
|
||||
struct mutex lock;
|
||||
struct nxp_74hc153_config config;
|
||||
};
|
||||
|
||||
static struct nxp_74hc153_chip *gpio_to_nxp(struct gpio_chip *gc)
|
||||
{
|
||||
return container_of(gc, struct nxp_74hc153_chip, gpio_chip);
|
||||
}
|
||||
|
||||
static int nxp_74hc153_direction_input(struct gpio_chip *gc, unsigned offset)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int nxp_74hc153_direction_output(struct gpio_chip *gc,
|
||||
unsigned offset, int val)
|
||||
{
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
static int nxp_74hc153_get_value(struct gpio_chip *gc, unsigned offset)
|
||||
{
|
||||
struct nxp_74hc153_chip *nxp;
|
||||
struct nxp_74hc153_platform_data *pdata;
|
||||
unsigned s0;
|
||||
unsigned s1;
|
||||
unsigned pin;
|
||||
int ret;
|
||||
|
||||
nxp = gpio_to_nxp(gc);
|
||||
pdata = nxp->parent->platform_data;
|
||||
|
||||
s0 = !!(offset & NXP_74HC153_S0_MASK);
|
||||
s1 = !!(offset & NXP_74HC153_S1_MASK);
|
||||
pin = (offset & NXP_74HC153_BANK_MASK) ? nxp->config.gpio_pin_2y
|
||||
: nxp->config.gpio_pin_1y;
|
||||
|
||||
mutex_lock(&nxp->lock);
|
||||
gpio_set_value(nxp->config.gpio_pin_s0, s0);
|
||||
gpio_set_value(nxp->config.gpio_pin_s1, s1);
|
||||
ret = gpio_get_value(pin);
|
||||
mutex_unlock(&nxp->lock);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void nxp_74hc153_set_value(struct gpio_chip *gc,
|
||||
unsigned offset, int val)
|
||||
{
|
||||
/* not supported */
|
||||
}
|
||||
|
||||
static int nxp_74hc153_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct device_node *np = pdev->dev.of_node;
|
||||
struct nxp_74hc153_chip *nxp;
|
||||
struct gpio_chip *gc;
|
||||
int err;
|
||||
unsigned gpio_s0;
|
||||
unsigned gpio_s1;
|
||||
unsigned gpio_1y;
|
||||
unsigned gpio_2y;
|
||||
|
||||
nxp = kzalloc(sizeof(struct nxp_74hc153_chip), GFP_KERNEL);
|
||||
if (nxp == NULL) {
|
||||
dev_err(&pdev->dev, "no memory for private data\n");
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
gpio_s0 = of_get_named_gpio(np, "gpio-s0", 0);
|
||||
gpio_s1 = of_get_named_gpio(np, "gpio-s1", 0);
|
||||
gpio_1y = of_get_named_gpio(np, "gpio-1y", 0);
|
||||
gpio_2y = of_get_named_gpio(np, "gpio-2y", 0);
|
||||
|
||||
if (!gpio_is_valid(gpio_s0) || !gpio_is_valid(gpio_s1) ||
|
||||
!gpio_is_valid(gpio_1y) || !gpio_is_valid(gpio_2y)) {
|
||||
|
||||
dev_err(&pdev->dev, "control GPIO(s) are missing\n");
|
||||
err = -EINVAL;
|
||||
goto err_free_nxp;
|
||||
} else {
|
||||
nxp->config.gpio_pin_s0 = gpio_s0;
|
||||
nxp->config.gpio_pin_s1 = gpio_s1;
|
||||
nxp->config.gpio_pin_1y = gpio_1y;
|
||||
nxp->config.gpio_pin_2y = gpio_2y;
|
||||
}
|
||||
|
||||
// apply pin configuration
|
||||
err = gpio_request(nxp->config.gpio_pin_s0, dev_name(&pdev->dev));
|
||||
if (err) {
|
||||
dev_err(&pdev->dev, "unable to claim gpio %u, err=%d\n",
|
||||
nxp->config.gpio_pin_s0, err);
|
||||
goto err_free_nxp;
|
||||
}
|
||||
|
||||
err = gpio_request(nxp->config.gpio_pin_s1, dev_name(&pdev->dev));
|
||||
if (err) {
|
||||
dev_err(&pdev->dev, "unable to claim gpio %u, err=%d\n",
|
||||
nxp->config.gpio_pin_s1, err);
|
||||
goto err_free_s0;
|
||||
}
|
||||
|
||||
err = gpio_request(nxp->config.gpio_pin_1y, dev_name(&pdev->dev));
|
||||
if (err) {
|
||||
dev_err(&pdev->dev, "unable to claim gpio %u, err=%d\n",
|
||||
nxp->config.gpio_pin_1y, err);
|
||||
goto err_free_s1;
|
||||
}
|
||||
|
||||
err = gpio_request(nxp->config.gpio_pin_2y, dev_name(&pdev->dev));
|
||||
if (err) {
|
||||
dev_err(&pdev->dev, "unable to claim gpio %u, err=%d\n",
|
||||
nxp->config.gpio_pin_2y, err);
|
||||
goto err_free_1y;
|
||||
}
|
||||
|
||||
err = gpio_direction_output(nxp->config.gpio_pin_s0, 0);
|
||||
if (err) {
|
||||
dev_err(&pdev->dev,
|
||||
"unable to set direction of gpio %u, err=%d\n",
|
||||
nxp->config.gpio_pin_s0, err);
|
||||
goto err_free_2y;
|
||||
}
|
||||
|
||||
err = gpio_direction_output(nxp->config.gpio_pin_s1, 0);
|
||||
if (err) {
|
||||
dev_err(&pdev->dev,
|
||||
"unable to set direction of gpio %u, err=%d\n",
|
||||
nxp->config.gpio_pin_s1, err);
|
||||
goto err_free_2y;
|
||||
}
|
||||
|
||||
err = gpio_direction_input(nxp->config.gpio_pin_1y);
|
||||
if (err) {
|
||||
dev_err(&pdev->dev,
|
||||
"unable to set direction of gpio %u, err=%d\n",
|
||||
nxp->config.gpio_pin_1y, err);
|
||||
goto err_free_2y;
|
||||
}
|
||||
|
||||
err = gpio_direction_input(nxp->config.gpio_pin_2y);
|
||||
if (err) {
|
||||
dev_err(&pdev->dev,
|
||||
"unable to set direction of gpio %u, err=%d\n",
|
||||
nxp->config.gpio_pin_2y, err);
|
||||
goto err_free_2y;
|
||||
}
|
||||
|
||||
nxp->parent = &pdev->dev;
|
||||
mutex_init(&nxp->lock);
|
||||
|
||||
gc = &nxp->gpio_chip;
|
||||
|
||||
gc->direction_input = nxp_74hc153_direction_input;
|
||||
gc->direction_output = nxp_74hc153_direction_output;
|
||||
gc->get = nxp_74hc153_get_value;
|
||||
gc->set = nxp_74hc153_set_value;
|
||||
gc->can_sleep = 1;
|
||||
|
||||
gc->base = -1;
|
||||
gc->ngpio = NXP_74HC153_NUM_GPIOS;
|
||||
gc->label = dev_name(nxp->parent);
|
||||
gc->parent = nxp->parent;
|
||||
gc->owner = THIS_MODULE;
|
||||
gc->of_node = np;
|
||||
|
||||
err = gpiochip_add(&nxp->gpio_chip);
|
||||
if (err) {
|
||||
dev_err(&pdev->dev, "unable to add gpio chip, err=%d\n", err);
|
||||
goto err_free_2y;
|
||||
}
|
||||
|
||||
platform_set_drvdata(pdev, nxp);
|
||||
return 0;
|
||||
|
||||
err_free_2y:
|
||||
gpio_free(nxp->config.gpio_pin_2y);
|
||||
err_free_1y:
|
||||
gpio_free(nxp->config.gpio_pin_1y);
|
||||
err_free_s1:
|
||||
gpio_free(nxp->config.gpio_pin_s1);
|
||||
err_free_s0:
|
||||
gpio_free(nxp->config.gpio_pin_s0);
|
||||
err_free_nxp:
|
||||
kfree(nxp);
|
||||
return err;
|
||||
}
|
||||
|
||||
static int nxp_74hc153_remove(struct platform_device *pdev)
|
||||
{
|
||||
struct nxp_74hc153_chip *nxp = platform_get_drvdata(pdev);
|
||||
|
||||
if (nxp) {
|
||||
gpiochip_remove(&nxp->gpio_chip);
|
||||
gpio_free(nxp->config.gpio_pin_2y);
|
||||
gpio_free(nxp->config.gpio_pin_1y);
|
||||
gpio_free(nxp->config.gpio_pin_s1);
|
||||
gpio_free(nxp->config.gpio_pin_s0);
|
||||
|
||||
kfree(nxp);
|
||||
platform_set_drvdata(pdev, NULL);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct of_device_id nxp_74hc153_id[] = {
|
||||
{
|
||||
.compatible = "nxp,74hc153-gpio",
|
||||
.data = NULL,
|
||||
}, { /* sentinel */ }
|
||||
};
|
||||
MODULE_DEVICE_TABLE(of, nxp_74hc153_id);
|
||||
|
||||
static struct platform_driver nxp_74hc153_driver = {
|
||||
.probe = nxp_74hc153_probe,
|
||||
.remove = nxp_74hc153_remove,
|
||||
.driver = {
|
||||
.name = NXP_74HC153_DRIVER_NAME,
|
||||
.owner = THIS_MODULE,
|
||||
.of_match_table = nxp_74hc153_id,
|
||||
},
|
||||
};
|
||||
|
||||
static int __init nxp_74hc153_init(void)
|
||||
{
|
||||
return platform_driver_register(&nxp_74hc153_driver);
|
||||
}
|
||||
subsys_initcall(nxp_74hc153_init);
|
||||
|
||||
static void __exit nxp_74hc153_exit(void)
|
||||
{
|
||||
platform_driver_unregister(&nxp_74hc153_driver);
|
||||
}
|
||||
module_exit(nxp_74hc153_exit);
|
||||
|
||||
MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
|
||||
MODULE_DESCRIPTION("GPIO expander driver for NXP 74HC153");
|
||||
MODULE_LICENSE("GPL v2");
|
||||
MODULE_ALIAS("platform:" NXP_74HC153_DRIVER_NAME);
|
||||
Loading…
Reference in New Issue
Block a user