/* export the GPIO to userspace */
int gpiod_export(struct gpio_desc *desc, bool direction_may_change);
- /* reverse gpio_export() */
+ /* reverse gpiod_export() */
void gpiod_unexport(struct gpio_desc *desc);
/* create a sysfs link to an exported GPIO node */
the correct GPIO number to use for a given signal.
-Exporting from Kernel code
---------------------------
-Kernel code can explicitly manage exports of GPIOs which have already been
-requested using gpio_request()::
-
- /* export the GPIO to userspace */
- int gpio_export(unsigned gpio, bool direction_may_change);
-
- /* reverse gpio_export() */
- void gpio_unexport();
-
-After a kernel driver requests a GPIO, it may only be made available in
-the sysfs interface by gpio_export(). The driver can control whether the
-signal direction may change. This helps drivers prevent userspace code
-from accidentally clobbering important system state.
-
-This explicit exporting can help with debugging (by making some kinds
-of experiments easier), or can provide an always-there interface that's
-suitable for documenting as part of a board support package.
-
-
API Reference
=============
确定给定信号所用的 GPIO 编号。
-从内核代码中导出
-----------------
-
-内核代码可以明确地管理那些已通过 gpio_request()申请的 GPIO 的导出::
-
- /* 导出 GPIO 到用户空间 */
- int gpio_export(unsigned gpio, bool direction_may_change);
-
- /* gpio_export()的逆操作 */
- void gpio_unexport();
-
-在一个内核驱动申请一个 GPIO 之后，它可以通过 gpio_export()使其在 sysfs
-接口中可见。该驱动可以控制信号方向是否可修改。这有助于防止用户空间代码无意间
-破坏重要的系统状态。
-
-这个明确的导出有助于(通过使某些实验更容易来)调试，也可以提供一个始终存在的接口，
-与文档配合作为板级支持包的一部分。
-
-
API参考
=======
固定的,例如在擴展卡上的 GPIO會根據所使用的主板或所在堆疊架構中其他的板子而
有所不同。在這種情況下,你可能需要使用 gpiochip 節點(儘可能地結合電路圖)來
確定給定信號所用的 GPIO 編號。
-
-
-從內核代碼中導出
--------------
-內核代碼可以明確地管理那些已通過 gpio_request()申請的 GPIO 的導出:
-
- /* 導出 GPIO 到用戶空間 */
- int gpio_export(unsigned gpio, bool direction_may_change);
-
- /* gpio_export()的逆操作 */
- void gpio_unexport();
-
-在一個內核驅動申請一個 GPIO 之後，它可以通過 gpio_export()使其在 sysfs
-接口中可見。該驅動可以控制信號方向是否可修改。這有助於防止用戶空間代碼無意間
-破壞重要的系統狀態。
-
-這個明確的導出有助於(通過使某些實驗更容易來)調試，也可以提供一個始終存在的接口，
-與文檔配合作爲板級支持包的一部分。
*/
#include <linux/clk.h>
#include <linux/davinci_emac.h>
+#include <linux/gpio/consumer.h>
#include <linux/gpio.h>
#include <linux/init.h>
#include <linux/kernel.h>
if (res)
return res;
- gpio_export(gpio, 0);
+ gpiod_export(gpio_to_desc(gpio), 0);
return 0;
}
return;
}
- gpio_export(gpio, 0);
+ gpiod_export(gpio_to_desc(gpio), 0);
udelay(10);
gpio_set_value(gpio, 1);
return;
}
- gpio_export(cm_t3517_wlan_gpios[0].gpio, 0);
- gpio_export(cm_t3517_wlan_gpios[1].gpio, 0);
+ gpiod_export(gpio_to_desc(cm_t3517_wlan_gpios[0].gpio), 0);
+ gpiod_export(gpio_to_desc(cm_t3517_wlan_gpios[1].gpio), 0);
msleep(100);
gpio_set_value(cm_t3517_wlan_gpios[1].gpio, 0);
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
#include <linux/gpio/machine.h>
#include <linux/i2c.h>
#include <linux/init.h>
/* LD3 and LD4 LEDs */
gpio_request(GPIO_PTX5, NULL); /* RUN */
gpio_direction_output(GPIO_PTX5, 1);
- gpio_export(GPIO_PTX5, 0);
+ gpiod_export(gpio_to_desc(GPIO_PTX5), 0);
gpio_request(GPIO_PTX4, NULL); /* INDICATOR */
gpio_direction_output(GPIO_PTX4, 0);
- gpio_export(GPIO_PTX4, 0);
+ gpiod_export(gpio_to_desc(GPIO_PTX4), 0);
/* SW1 input */
gpio_request(GPIO_PTF7, NULL); /* MODE */
gpio_direction_input(GPIO_PTF7);
- gpio_export(GPIO_PTF7, 0);
+ gpiod_export(gpio_to_desc(GPIO_PTF7), 0);
/* LCDC */
gpio_request(GPIO_FN_LCDD15, NULL);
goto done;
desc = gpio_to_desc(gpio);
- /* reject bogus commands (gpio_unexport ignores them) */
+ /* reject bogus commands (gpiod_unexport() ignores them) */
if (!desc) {
pr_warn("%s: invalid GPIO %ld\n", __func__, gpio);
return -EINVAL;
* early (e.g. before the class_register above was called).
*
* We run before arch_initcall() so chip->dev nodes can have
- * registered, and so arch_initcall() can always gpio_export().
+ * registered, and so arch_initcall() can always gpiod_export().
*/
spin_lock_irqsave(&gpio_lock, flags);
list_for_each_entry(gdev, &gpio_devices, list) {
#include <linux/pci.h>
#include <linux/interrupt.h>
#include <linux/io.h>
+#include <linux/gpio/consumer.h>
#include <linux/gpio.h>
#include <linux/i2c.h>
#include <linux/delay.h>
static int vip_gpio_reserve(struct device *dev, int pin, int dir,
const char *name)
{
+ struct gpio_desc *desc = gpio_to_desc(pin);
int ret = -ENODEV;
if (!gpio_is_valid(pin))
return ret;
}
- ret = gpio_direction_output(pin, dir);
+ ret = gpiod_direction_output(desc, dir);
if (ret) {
dev_err(dev, "Failed to set direction for pin %d (%s)\n",
pin, name);
return ret;
}
- ret = gpio_export(pin, false);
+ ret = gpiod_export(desc, false);
if (ret) {
dev_err(dev, "Failed to export pin %d (%s)\n", pin, name);
gpio_free(pin);
static void vip_gpio_release(struct device *dev, int pin, const char *name)
{
if (gpio_is_valid(pin)) {
+ struct gpio_desc *desc = gpio_to_desc(pin);
+
dev_dbg(dev, "releasing pin %d (%s)\n", pin, name);
- gpio_unexport(pin);
+ gpiod_unexport(desc);
gpio_free(pin);
}
}
#include <linux/clk-provider.h>
#include <linux/debugfs.h>
#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
#include <linux/gpio.h>
#include <linux/ieee802154.h>
#include <linux/io.h>
);
if (ret) {
dev_crit(&spi->dev, "request_irq %d failed\n", pdata->irq_id);
- gpio_unexport(pdata->gpio_irq);
+ gpiod_unexport(gpio_to_desc(pdata->gpio_irq));
gpio_free(pdata->gpio_irq);
}
int gpio_request_array(const struct gpio *array, size_t num);
void gpio_free_array(const struct gpio *array, size_t num);
-/*
- * A sysfs interface can be exported by individual drivers if they want,
- * but more typically is configured entirely from userspace.
- */
-static inline int gpio_export(unsigned gpio, bool direction_may_change)
-{
- return gpiod_export(gpio_to_desc(gpio), direction_may_change);
-}
-
-static inline void gpio_unexport(unsigned gpio)
-{
- gpiod_unexport(gpio_to_desc(gpio));
-}
-
/* CONFIG_GPIOLIB: bindings for managed devices that want to request gpios */
struct device;
WARN_ON(1);
}
-static inline int gpio_export(unsigned gpio, bool direction_may_change)
-{
- /* GPIO can never have been requested or set as {in,out}put */
- WARN_ON(1);
- return -EINVAL;
-}
-
-static inline void gpio_unexport(unsigned gpio)
-{
- /* GPIO can never have been exported */
- WARN_ON(1);
-}
-
static inline int gpio_to_irq(unsigned gpio)
{
/* GPIO can never have been requested or set as input */
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