ath79: add gpio-latch driver for MikroTik RouterBOARDs
This is a slighty modified version of ar71xx gpio-latch driver
written by Gabor Juhos <juhosg@openwrt.org>.
Changes:
* DTS support,
* New gpio API (gpiod_*).
Reviewed-by: Sergey Ryazanov <ryazanov.s.a@gmail.com>
Signed-off-by: Denis Kalashnikov <denis281089@gmail.com>
(cherry-picked from commit 7b8931678c)
This commit is contained in:
Denis Kalashnikov
committed by
Koen Vandeputte
Koen Vandeputte
parent
3eb34bc251
commit
43723e6db9
203
target/linux/ath79/files/drivers/gpio/gpio-latch.c
Normal file
203
target/linux/ath79/files/drivers/gpio/gpio-latch.c
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@@ -0,0 +1,203 @@
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* GPIO latch driver
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*
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* Copyright (C) 2014 Gabor Juhos <juhosg@openwrt.org>
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/gpio/consumer.h>
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#include <linux/gpio/driver.h>
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#include <linux/platform_device.h>
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#include <linux/of_platform.h>
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#include <linux/of_gpio.h>
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#define GPIO_LATCH_DRIVER_NAME "gpio-latch"
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#define GPIO_LATCH_LINES 9
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struct gpio_latch_chip {
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struct gpio_chip gc;
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struct mutex mutex;
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struct mutex latch_mutex;
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bool latch_enabled;
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int le_gpio;
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bool le_active_low;
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struct gpio_desc *gpios[GPIO_LATCH_LINES];
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};
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static inline struct gpio_latch_chip *to_gpio_latch_chip(struct gpio_chip *gc)
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{
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return container_of(gc, struct gpio_latch_chip, gc);
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}
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static void gpio_latch_lock(struct gpio_latch_chip *glc, bool enable)
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{
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mutex_lock(&glc->mutex);
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if (enable)
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glc->latch_enabled = true;
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if (glc->latch_enabled)
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mutex_lock(&glc->latch_mutex);
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}
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static void gpio_latch_unlock(struct gpio_latch_chip *glc, bool disable)
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{
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if (glc->latch_enabled)
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mutex_unlock(&glc->latch_mutex);
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if (disable)
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glc->latch_enabled = true;
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mutex_unlock(&glc->mutex);
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}
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static int
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gpio_latch_get(struct gpio_chip *gc, unsigned offset)
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{
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struct gpio_latch_chip *glc = to_gpio_latch_chip(gc);
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int ret;
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gpio_latch_lock(glc, false);
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ret = gpiod_get_value(glc->gpios[offset]);
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gpio_latch_unlock(glc, false);
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return ret;
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}
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static void
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gpio_latch_set(struct gpio_chip *gc, unsigned offset, int value)
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{
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struct gpio_latch_chip *glc = to_gpio_latch_chip(gc);
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bool enable_latch = false;
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bool disable_latch = false;
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if (offset == glc->le_gpio) {
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enable_latch = value ^ glc->le_active_low;
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disable_latch = !enable_latch;
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}
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gpio_latch_lock(glc, enable_latch);
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gpiod_set_raw_value(glc->gpios[offset], value);
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gpio_latch_unlock(glc, disable_latch);
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}
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static int
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gpio_latch_direction_output(struct gpio_chip *gc, unsigned offset, int value)
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{
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struct gpio_latch_chip *glc = to_gpio_latch_chip(gc);
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bool enable_latch = false;
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bool disable_latch = false;
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int ret;
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if (offset == glc->le_gpio) {
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enable_latch = value ^ glc->le_active_low;
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disable_latch = !enable_latch;
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}
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gpio_latch_lock(glc, enable_latch);
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ret = gpiod_direction_output_raw(glc->gpios[offset], value);
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gpio_latch_unlock(glc, disable_latch);
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return ret;
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}
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static int gpio_latch_probe(struct platform_device *pdev)
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{
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struct gpio_latch_chip *glc;
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struct gpio_chip *gc;
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struct device *dev = &pdev->dev;
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struct device_node *of_node = dev->of_node;
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int i, n;
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glc = devm_kzalloc(dev, sizeof(*glc), GFP_KERNEL);
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if (!glc)
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return -ENOMEM;
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mutex_init(&glc->mutex);
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mutex_init(&glc->latch_mutex);
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n = gpiod_count(dev, NULL);
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if (n <= 0) {
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dev_err(dev, "failed to get gpios: %d\n", n);
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return n;
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} else if (n != GPIO_LATCH_LINES) {
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dev_err(dev, "expected %d gpios\n", GPIO_LATCH_LINES);
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return -EINVAL;
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}
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for (i = 0; i < n; i++) {
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glc->gpios[i] = devm_gpiod_get_index_optional(dev, NULL, i,
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GPIOD_OUT_LOW);
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if (IS_ERR(glc->gpios[i])) {
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dev_err(dev, "failed to get gpio %d: %d\n", i,
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PTR_ERR(glc->gpios[i]));
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return PTR_ERR(glc->gpios[i]);
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}
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}
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glc->le_gpio = 8;
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glc->le_active_low = gpiod_is_active_low(glc->gpios[glc->le_gpio]);
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if (!glc->gpios[glc->le_gpio]) {
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dev_err(dev, "missing required latch-enable gpio %d\n",
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glc->le_gpio);
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return -EINVAL;
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}
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gc = &glc->gc;
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gc->label = GPIO_LATCH_DRIVER_NAME;
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gc->can_sleep = true;
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gc->base = -1;
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gc->ngpio = GPIO_LATCH_LINES;
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gc->get = gpio_latch_get;
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gc->set = gpio_latch_set;
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gc->direction_output = gpio_latch_direction_output;
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gc->of_node = of_node;
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platform_set_drvdata(pdev, glc);
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i = gpiochip_add(&glc->gc);
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if (i) {
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dev_err(dev, "gpiochip_add() failed: %d\n", i);
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return i;
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}
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return 0;
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}
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static int gpio_latch_remove(struct platform_device *pdev)
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{
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struct gpio_latch_chip *glc = platform_get_drvdata(pdev);
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gpiochip_remove(&glc->gc);
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return 0;
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}
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static const struct of_device_id gpio_latch_match[] = {
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{ .compatible = GPIO_LATCH_DRIVER_NAME },
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{},
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};
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MODULE_DEVICE_TABLE(of, gpio_latch_match);
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static struct platform_driver gpio_latch_driver = {
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.probe = gpio_latch_probe,
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.remove = gpio_latch_remove,
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.driver = {
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.name = GPIO_LATCH_DRIVER_NAME,
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.owner = THIS_MODULE,
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.of_match_table = gpio_latch_match,
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},
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};
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module_platform_driver(gpio_latch_driver);
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MODULE_DESCRIPTION("GPIO latch driver");
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MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
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MODULE_AUTHOR("Denis Kalashnikov <denis281089@gmail.com>");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("platform:" GPIO_LATCH_DRIVER_NAME);
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23
target/linux/ath79/patches-5.4/939-mikrotik-rb91x.patch
Normal file
23
target/linux/ath79/patches-5.4/939-mikrotik-rb91x.patch
Normal file
@@ -0,0 +1,23 @@
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--- a/drivers/gpio/Kconfig
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+++ b/drivers/gpio/Kconfig
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@@ -130,6 +130,10 @@ config GPIO_ATH79
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Select this option to enable GPIO driver for
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Atheros AR71XX/AR724X/AR913X SoC devices.
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+config GPIO_LATCH
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+ tristate "MikroTik RouterBOARD GPIO latch support"
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+ depends on ATH79
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+
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config GPIO_RASPBERRYPI_EXP
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tristate "Raspberry Pi 3 GPIO Expander"
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default RASPBERRYPI_FIRMWARE
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--- a/drivers/gpio/Makefile
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+++ b/drivers/gpio/Makefile
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@@ -67,6 +67,7 @@ obj-$(CONFIG_GPIO_IT87) += gpio-it87.o
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obj-$(CONFIG_GPIO_IXP4XX) += gpio-ixp4xx.o
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obj-$(CONFIG_GPIO_JANZ_TTL) += gpio-janz-ttl.o
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obj-$(CONFIG_GPIO_KEMPLD) += gpio-kempld.o
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+obj-$(CONFIG_GPIO_LATCH) += gpio-latch.o
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obj-$(CONFIG_GPIO_LOONGSON1) += gpio-loongson1.o
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obj-$(CONFIG_GPIO_LOONGSON) += gpio-loongson.o
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obj-$(CONFIG_GPIO_LP3943) += gpio-lp3943.o
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