drivers/gpio/gpiolib-cdev.c

70  * @gdev: the GPIO device the handle pertains to
76 	struct gpio_device *gdev;
207 	guard(srcu)(&lh->gdev->srcu);
209 	if (!rcu_access_pointer(lh->gdev->chip))
274 	gpio_device_put(lh->gdev);
294 static int linehandle_create(struct gpio_device *gdev, void __user *ip)
316 	lh->gdev = gpio_device_get(gdev);
334 		struct gpio_desc *desc = gpio_device_get_desc(gdev, offset);
369 		dev_dbg(&gdev->dev, "registered chardev handle for line %d\n",
401 	dev_dbg(&gdev->dev, "registered chardev handle for %d lines\n",
526  * @gdev: the GPIO device the line request pertains to
530  * @device_unregistered_nb: notifier block for receiving gdev unregister events
542 	struct gpio_device *gdev;
1569 	guard(srcu)(&lr->gdev->srcu);
1571 	if (!rcu_access_pointer(lr->gdev->chip))
1600 	guard(srcu)(&lr->gdev->srcu);
1602 	if (!rcu_access_pointer(lr->gdev->chip))
1622 	guard(srcu)(&lr->gdev->srcu);
1624 	if (!rcu_access_pointer(lr->gdev->chip))
1671 		blocking_notifier_chain_unregister(&lr->gdev->device_notifier,
1686 	gpio_device_put(lr->gdev);
1702 	struct device *dev = &lr->gdev->dev;
1728 static int linereq_create(struct gpio_device *gdev, void __user *ip)
1757 	lr->gdev = gpio_device_get(gdev);
1788 		struct gpio_desc *desc = gpio_device_get_desc(gdev, offset);
1833 		dev_dbg(&gdev->dev, "registered chardev handle for line %d\n",
1838 	ret = blocking_notifier_chain_register(&gdev->device_notifier,
1869 	dev_dbg(&gdev->dev, "registered chardev handle for %d lines\n",
1889  * @gdev: the GPIO device the event pertains to
1895  * @device_unregistered_nb: notifier block for receiving gdev unregister events
1902 	struct gpio_device *gdev;
1923 	guard(srcu)(&le->gdev->srcu);
1925 	if (!rcu_access_pointer(le->gdev->chip))
1961 	guard(srcu)(&le->gdev->srcu);
1963 	if (!rcu_access_pointer(le->gdev->chip))
2020 		blocking_notifier_chain_unregister(&le->gdev->device_notifier,
2027 	gpio_device_put(le->gdev);
2044 	guard(srcu)(&le->gdev->srcu);
2046 	if (!rcu_access_pointer(le->gdev->chip))
2152 static int lineevent_create(struct gpio_device *gdev, void __user *ip)
2173 	desc = gpio_device_get_desc(gdev, offset);
2199 	le->gdev = gpio_device_get(gdev);
2244 	ret = blocking_notifier_chain_register(&gdev->device_notifier,
2368 	scoped_guard(srcu, &desc->gdev->desc_srcu) {
2428 	struct gpio_device *gdev;
2441 	struct gpio_device *gdev = cdev->gdev;
2446 	strscpy(chipinfo.name, dev_name(&gdev->dev), sizeof(chipinfo.name));
2447 	strscpy(chipinfo.label, gdev->label, sizeof(chipinfo.label));
2448 	chipinfo.lines = gdev->ngpio;
2480 	desc = gpio_device_get_desc(cdev->gdev, lineinfo.line_offset);
2517 	desc = gpio_device_get_desc(cdev->gdev, lineinfo.offset);
2548 	if (offset >= cdev->gdev->ngpio)
2563 	struct gpio_device *gdev = cdev->gdev;
2566 	guard(srcu)(&gdev->srcu);
2569 	if (!rcu_access_pointer(gdev->chip))
2578 		return linehandle_create(gdev, ip);
2580 		return lineevent_create(gdev, ip);
2591 		return linereq_create(gdev, ip);
2652 	guard(srcu)(&cdev->gdev->srcu);
2654 	if (!rcu_access_pointer(cdev->gdev->chip))
2675 	guard(srcu)(&cdev->gdev->srcu);
2677 	if (!rcu_access_pointer(cdev->gdev->chip))
2747 	struct gpio_device *gdev = container_of(inode->i_cdev,
2752 	guard(srcu)(&gdev->srcu);
2755 	if (!rcu_access_pointer(gdev->chip))
2762 	cdev->watched_lines = bitmap_zalloc(gdev->ngpio, GFP_KERNEL);
2768 	cdev->gdev = gpio_device_get(gdev);
2771 	ret = blocking_notifier_chain_register(&gdev->line_state_notifier,
2778 	ret = blocking_notifier_chain_register(&gdev->device_notifier,
2792 	blocking_notifier_chain_unregister(&gdev->device_notifier,
2795 	blocking_notifier_chain_unregister(&gdev->line_state_notifier,
2798 	gpio_device_put(gdev);
2814 	struct gpio_device *gdev = cdev->gdev;
2816 	blocking_notifier_chain_unregister(&gdev->device_notifier,
2818 	blocking_notifier_chain_unregister(&gdev->line_state_notifier,
2821 	gpio_device_put(gdev);
2840 int gpiolib_cdev_register(struct gpio_device *gdev, dev_t devt)
2845 	cdev_init(&gdev->chrdev, &gpio_fileops);
2846 	gdev->chrdev.owner = THIS_MODULE;
2847 	gdev->dev.devt = MKDEV(MAJOR(devt), gdev->id);
2849 	ret = cdev_device_add(&gdev->chrdev, &gdev->dev);
2853 	guard(srcu)(&gdev->srcu);
2854 	gc = srcu_dereference(gdev->chip, &gdev->srcu);
2858 	chip_dbg(gc, "added GPIO chardev (%d:%d)\n", MAJOR(devt), gdev->id);
2863 void gpiolib_cdev_unregister(struct gpio_device *gdev)
2865 	cdev_device_del(&gdev->chrdev, &gdev->dev);
2866 	blocking_notifier_call_chain(&gdev->device_notifier, 0, NULL);