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-rw-r--r--target/linux/ar71xx/files/drivers/gpio/gpio-latch.c220
-rw-r--r--target/linux/ar71xx/files/drivers/gpio/gpio-nxp-74hc153.c251
2 files changed, 471 insertions, 0 deletions
diff --git a/target/linux/ar71xx/files/drivers/gpio/gpio-latch.c b/target/linux/ar71xx/files/drivers/gpio/gpio-latch.c
new file mode 100644
index 0000000..d911f6a
--- /dev/null
+++ b/target/linux/ar71xx/files/drivers/gpio/gpio-latch.c
@@ -0,0 +1,220 @@
+/*
+ * GPIO latch driver
+ *
+ * Copyright (C) 2014 Gabor Juhos <juhosg@openwrt.org>
+ *
+ * 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.
+ */
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/gpio.h>
+#include <linux/slab.h>
+#include <linux/platform_device.h>
+
+#include <linux/platform_data/gpio-latch.h>
+
+struct gpio_latch_chip {
+ struct gpio_chip gc;
+
+ struct mutex mutex;
+ struct mutex latch_mutex;
+ bool latch_enabled;
+ int le_gpio;
+ bool le_active_low;
+ int *gpios;
+};
+
+static inline struct gpio_latch_chip *to_gpio_latch_chip(struct gpio_chip *gc)
+{
+ return container_of(gc, struct gpio_latch_chip, gc);
+}
+
+static void gpio_latch_lock(struct gpio_latch_chip *glc, bool enable)
+{
+ mutex_lock(&glc->mutex);
+
+ if (enable)
+ glc->latch_enabled = true;
+
+ if (glc->latch_enabled)
+ mutex_lock(&glc->latch_mutex);
+}
+
+static void gpio_latch_unlock(struct gpio_latch_chip *glc, bool disable)
+{
+ if (glc->latch_enabled)
+ mutex_unlock(&glc->latch_mutex);
+
+ if (disable)
+ glc->latch_enabled = true;
+
+ mutex_unlock(&glc->mutex);
+}
+
+static int
+gpio_latch_get(struct gpio_chip *gc, unsigned offset)
+{
+ struct gpio_latch_chip *glc = to_gpio_latch_chip(gc);
+ int ret;
+
+ gpio_latch_lock(glc, false);
+ ret = gpio_get_value(glc->gpios[offset]);
+ gpio_latch_unlock(glc, false);
+
+ return ret;
+}
+
+static void
+gpio_latch_set(struct gpio_chip *gc, unsigned offset, int value)
+{
+ struct gpio_latch_chip *glc = to_gpio_latch_chip(gc);
+ bool enable_latch = false;
+ bool disable_latch = false;
+ int gpio;
+
+ gpio = glc->gpios[offset];
+
+ if (gpio == glc->le_gpio) {
+ enable_latch = value ^ glc->le_active_low;
+ disable_latch = !enable_latch;
+ }
+
+ gpio_latch_lock(glc, enable_latch);
+ gpio_set_value(gpio, value);
+ gpio_latch_unlock(glc, disable_latch);
+}
+
+static int
+gpio_latch_direction_input(struct gpio_chip *gc, unsigned offset)
+{
+ struct gpio_latch_chip *glc = to_gpio_latch_chip(gc);
+ int ret;
+
+ gpio_latch_lock(glc, false);
+ ret = gpio_direction_input(glc->gpios[offset]);
+ gpio_latch_unlock(glc, false);
+
+ return ret;
+}
+
+static int
+gpio_latch_direction_output(struct gpio_chip *gc, unsigned offset, int value)
+{
+ struct gpio_latch_chip *glc = to_gpio_latch_chip(gc);
+ bool enable_latch = false;
+ bool disable_latch = false;
+ int gpio;
+ int ret;
+
+ gpio = glc->gpios[offset];
+
+ if (gpio == glc->le_gpio) {
+ enable_latch = value ^ glc->le_active_low;
+ disable_latch = !enable_latch;
+ }
+
+ gpio_latch_lock(glc, enable_latch);
+ ret = gpio_direction_output(gpio, value);
+ gpio_latch_unlock(glc, disable_latch);
+
+ return ret;
+}
+
+static int gpio_latch_probe(struct platform_device *pdev)
+{
+ struct gpio_latch_chip *glc;
+ struct gpio_latch_platform_data *pdata;
+ struct gpio_chip *gc;
+ int size;
+ int ret;
+ int i;
+
+ pdata = dev_get_platdata(&pdev->dev);
+ if (!pdata)
+ return -EINVAL;
+
+ if (pdata->le_gpio_index >= pdata->num_gpios ||
+ !pdata->num_gpios ||
+ !pdata->gpios)
+ return -EINVAL;
+
+ for (i = 0; i < pdata->num_gpios; i++) {
+ int gpio = pdata->gpios[i];
+
+ ret = devm_gpio_request(&pdev->dev, gpio,
+ GPIO_LATCH_DRIVER_NAME);
+ if (ret)
+ return ret;
+ }
+
+ glc = devm_kzalloc(&pdev->dev, sizeof(*glc), GFP_KERNEL);
+ if (!glc)
+ return -ENOMEM;
+
+ mutex_init(&glc->mutex);
+ mutex_init(&glc->latch_mutex);
+
+ size = pdata->num_gpios * sizeof(glc->gpios[0]);
+ glc->gpios = devm_kzalloc(&pdev->dev, size , GFP_KERNEL);
+ if (!glc->gpios)
+ return -ENOMEM;
+
+ memcpy(glc->gpios, pdata->gpios, size);
+
+ glc->le_gpio = glc->gpios[pdata->le_gpio_index];
+ glc->le_active_low = pdata->le_active_low;
+
+ gc = &glc->gc;
+
+ gc->label = GPIO_LATCH_DRIVER_NAME;
+ gc->base = pdata->base;
+ gc->can_sleep = true;
+ gc->ngpio = pdata->num_gpios;
+ gc->get = gpio_latch_get;
+ gc->set = gpio_latch_set;
+ gc->direction_input = gpio_latch_direction_input,
+ gc->direction_output = gpio_latch_direction_output;
+
+ platform_set_drvdata(pdev, glc);
+
+ ret = gpiochip_add(&glc->gc);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static int gpio_latch_remove(struct platform_device *pdev)
+{
+ struct gpio_latch_chip *glc = platform_get_drvdata(pdev);
+
+ gpiochip_remove(&glc->gc);
+ return 0;
+}
+
+
+static struct platform_driver gpio_latch_driver = {
+ .probe = gpio_latch_probe,
+ .remove = gpio_latch_remove,
+ .driver = {
+ .name = GPIO_LATCH_DRIVER_NAME,
+ .owner = THIS_MODULE,
+ },
+};
+
+static int __init gpio_latch_init(void)
+{
+ return platform_driver_register(&gpio_latch_driver);
+}
+
+postcore_initcall(gpio_latch_init);
+
+MODULE_DESCRIPTION("GPIO latch driver");
+MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:" GPIO_LATCH_DRIVER_NAME);
diff --git a/target/linux/ar71xx/files/drivers/gpio/gpio-nxp-74hc153.c b/target/linux/ar71xx/files/drivers/gpio/gpio-nxp-74hc153.c
new file mode 100644
index 0000000..8c01efe
--- /dev/null
+++ b/target/linux/ar71xx/files/drivers/gpio/gpio-nxp-74hc153.c
@@ -0,0 +1,251 @@
+/*
+ * NXP 74HC153 - Dual 4-input multiplexer GPIO driver
+ *
+ * Copyright (C) 2010 Gabor Juhos <juhosg@openwrt.org>
+ *
+ * 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.
+ */
+
+#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/nxp_74hc153.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
+
+struct nxp_74hc153_chip {
+ struct device *parent;
+ struct gpio_chip gpio_chip;
+ struct mutex lock;
+};
+
+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) ? pdata->gpio_pin_2y
+ : pdata->gpio_pin_1y;
+
+ mutex_lock(&nxp->lock);
+ gpio_set_value(pdata->gpio_pin_s0, s0);
+ gpio_set_value(pdata->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 nxp_74hc153_platform_data *pdata;
+ struct nxp_74hc153_chip *nxp;
+ struct gpio_chip *gc;
+ int err;
+
+ pdata = pdev->dev.platform_data;
+ if (pdata == NULL) {
+ dev_dbg(&pdev->dev, "no platform data specified\n");
+ return -EINVAL;
+ }
+
+ nxp = kzalloc(sizeof(struct nxp_74hc153_chip), GFP_KERNEL);
+ if (nxp == NULL) {
+ dev_err(&pdev->dev, "no memory for private data\n");
+ return -ENOMEM;
+ }
+
+ err = gpio_request(pdata->gpio_pin_s0, dev_name(&pdev->dev));
+ if (err) {
+ dev_err(&pdev->dev, "unable to claim gpio %u, err=%d\n",
+ pdata->gpio_pin_s0, err);
+ goto err_free_nxp;
+ }
+
+ err = gpio_request(pdata->gpio_pin_s1, dev_name(&pdev->dev));
+ if (err) {
+ dev_err(&pdev->dev, "unable to claim gpio %u, err=%d\n",
+ pdata->gpio_pin_s1, err);
+ goto err_free_s0;
+ }
+
+ err = gpio_request(pdata->gpio_pin_1y, dev_name(&pdev->dev));
+ if (err) {
+ dev_err(&pdev->dev, "unable to claim gpio %u, err=%d\n",
+ pdata->gpio_pin_1y, err);
+ goto err_free_s1;
+ }
+
+ err = gpio_request(pdata->gpio_pin_2y, dev_name(&pdev->dev));
+ if (err) {
+ dev_err(&pdev->dev, "unable to claim gpio %u, err=%d\n",
+ pdata->gpio_pin_2y, err);
+ goto err_free_1y;
+ }
+
+ err = gpio_direction_output(pdata->gpio_pin_s0, 0);
+ if (err) {
+ dev_err(&pdev->dev,
+ "unable to set direction of gpio %u, err=%d\n",
+ pdata->gpio_pin_s0, err);
+ goto err_free_2y;
+ }
+
+ err = gpio_direction_output(pdata->gpio_pin_s1, 0);
+ if (err) {
+ dev_err(&pdev->dev,
+ "unable to set direction of gpio %u, err=%d\n",
+ pdata->gpio_pin_s1, err);
+ goto err_free_2y;
+ }
+
+ err = gpio_direction_input(pdata->gpio_pin_1y);
+ if (err) {
+ dev_err(&pdev->dev,
+ "unable to set direction of gpio %u, err=%d\n",
+ pdata->gpio_pin_1y, err);
+ goto err_free_2y;
+ }
+
+ err = gpio_direction_input(pdata->gpio_pin_2y);
+ if (err) {
+ dev_err(&pdev->dev,
+ "unable to set direction of gpio %u, err=%d\n",
+ pdata->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 = pdata->gpio_base;
+ gc->ngpio = NXP_74HC153_NUM_GPIOS;
+ gc->label = dev_name(nxp->parent);
+ gc->dev = nxp->parent;
+ gc->owner = THIS_MODULE;
+
+ 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(pdata->gpio_pin_2y);
+err_free_1y:
+ gpio_free(pdata->gpio_pin_1y);
+err_free_s1:
+ gpio_free(pdata->gpio_pin_s1);
+err_free_s0:
+ gpio_free(pdata->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);
+ struct nxp_74hc153_platform_data *pdata = pdev->dev.platform_data;
+
+ if (nxp) {
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3,15,0)
+ int err;
+
+ err = gpiochip_remove(&nxp->gpio_chip);
+ if (err) {
+ dev_err(&pdev->dev,
+ "unable to remove gpio chip, err=%d\n",
+ err);
+ return err;
+ }
+#else
+ gpiochip_remove(&nxp->gpio_chip);
+#endif
+ gpio_free(pdata->gpio_pin_2y);
+ gpio_free(pdata->gpio_pin_1y);
+ gpio_free(pdata->gpio_pin_s1);
+ gpio_free(pdata->gpio_pin_s0);
+
+ kfree(nxp);
+ platform_set_drvdata(pdev, NULL);
+ }
+
+ return 0;
+}
+
+static struct platform_driver nxp_74hc153_driver = {
+ .probe = nxp_74hc153_probe,
+ .remove = nxp_74hc153_remove,
+ .driver = {
+ .name = NXP_74HC153_DRIVER_NAME,
+ .owner = THIS_MODULE,
+ },
+};
+
+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);
generated by cgit v1.2.3 (git 2.25.1) at 2025-02-21 21:37:33 +0000