74 lines
1,6 KiB
C
74 lines
1,6 KiB
C
#include <linux/kernel.h>
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#include <linux/platform_device.h>
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#include <linux/gpio.h>
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#include <linux/gpio/driver.h>
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#include <linux/module.h>
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#include <linux/init.h>
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struct dummy_gpio {
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struct gpio_chip gc;
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struct mutex lock;
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};
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static struct dummy_gpio dgpio;
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static int dummy_gpio_direction_input(struct gpio_chip *chip, unsigned offset) {
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printk("direction input\n");
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return 0;
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}
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static void dummy_gpio_set(struct gpio_chip *chip, unsigned offset, int value) {
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printk("set\n");
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}
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static int dummy_gpio_direction_output(struct gpio_chip *chip, unsigned offset, int value) {
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printk("output\n");
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return 0;
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}
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static int dummy_gpio_get(struct gpio_chip *chip, unsigned offset) {
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printk("get\n");
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return 0;
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}
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static int __init dummy_gpio_init(void) {
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int err;
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mutex_init(&dgpio.lock);
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dgpio.gc.label = "dummy_gpio";
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dgpio.gc.direction_input = dummy_gpio_direction_input;
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dgpio.gc.get = dummy_gpio_get;
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dgpio.gc.direction_output = dummy_gpio_direction_output;
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dgpio.gc.set = dummy_gpio_set;
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dgpio.gc.ngpio = 8;
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dgpio.gc.can_sleep = true;
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// from 4.5
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dgpio.gc.parent = NULL;
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// dgpio.gc.dev = NULL;
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dgpio.gc.owner = THIS_MODULE;
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// gpiochip_add_data from 4.5
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err = gpiochip_add(&dgpio.gc);
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//err = gpiochip_add_data()
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if(err)
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goto exit_destroy;
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return err;
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exit_destroy:
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mutex_destroy(&dgpio.lock);
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return err;
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}
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static void __exit dummy_gpio_exit(void) {
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gpiochip_remove(&dgpio.gc);
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mutex_destroy(&dgpio.lock);
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printk("dummy_gpio: Cya in another life\n");
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}
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module_init(dummy_gpio_init);
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module_exit(dummy_gpio_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("encrypt";)
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MODULE_DESCRIPTION("Dummy gpiochip");
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