1 // SPDX-License-Identifier: GPL-2.0-or-later
4     bttv-gpio.c  --  gpio sub drivers
6     sysfs-based sub driver interface for bttv
10     Copyright (C) 1996,97,98 Ralph  Metzler (rjkm@thp.uni-koeln.de)
11 			   & Marcus Metzler (mocm@thp.uni-koeln.de)
12     (c) 1999-2003 Gerd Knorr <kraxel@bytesex.org>
28 /* ----------------------------------------------------------------------- */
29 /* internal: the bttv "bus"                                                */
33 	const struct bttv_sub_driver *sub = to_bttv_sub_drv(drv);  in bttv_sub_bus_match()  local
34 	int len = strlen(sub->wanted);  in bttv_sub_bus_match()
36 	if (0 == strncmp(dev_name(dev), sub->wanted, len))  in bttv_sub_bus_match()
44 	struct bttv_sub_driver *sub = to_bttv_sub_drv(dev->driver);  in bttv_sub_probe()  local
46 	return sub->probe ? sub->probe(sdev) : -ENODEV;  in bttv_sub_probe()
52 	struct bttv_sub_driver *sub = to_bttv_sub_drv(dev->driver);  in bttv_sub_remove()  local
54 	if (sub->remove)  in bttv_sub_remove()
55 		sub->remove(sdev);  in bttv_sub_remove()
59 	.name   = "bttv-sub",
67 	struct bttv_sub_device *sub = to_bttv_sub_dev(dev);  in release_sub_device()  local
68 	kfree(sub);  in release_sub_device()
73 	struct bttv_sub_device *sub;  in bttv_sub_add_device()  local
76 	sub = kzalloc(sizeof(*sub),GFP_KERNEL);  in bttv_sub_add_device()
77 	if (NULL == sub)  in bttv_sub_add_device()
78 		return -ENOMEM;  in bttv_sub_add_device()
80 	sub->core        = core;  in bttv_sub_add_device()
81 	sub->dev.parent  = &core->pci->dev;  in bttv_sub_add_device()
82 	sub->dev.bus     = &bttv_sub_bus_type;  in bttv_sub_add_device()
83 	sub->dev.release = release_sub_device;  in bttv_sub_add_device()
84 	dev_set_name(&sub->dev, "%s%d", name, core->nr);  in bttv_sub_add_device()
86 	err = device_register(&sub->dev);  in bttv_sub_add_device()
88 		put_device(&sub->dev);  in bttv_sub_add_device()
91 	pr_info("%d: add subdevice \"%s\"\n", core->nr, dev_name(&sub->dev));  in bttv_sub_add_device()
92 	list_add_tail(&sub->list,&core->subs);  in bttv_sub_add_device()
98 	struct bttv_sub_device *sub, *save;  in bttv_sub_del_devices()  local
100 	list_for_each_entry_safe(sub, save, &core->subs, list) {  in bttv_sub_del_devices()
101 		list_del(&sub->list);  in bttv_sub_del_devices()
102 		device_unregister(&sub->dev);  in bttv_sub_del_devices()
107 /* ----------------------------------------------------------------------- */
108 /* external: sub-driver register/unregister                                */
110 int bttv_sub_register(struct bttv_sub_driver *sub, char *wanted)  in bttv_sub_register()  argument
112 	sub->drv.bus = &bttv_sub_bus_type;  in bttv_sub_register()
113 	snprintf(sub->wanted,sizeof(sub->wanted),"%s",wanted);  in bttv_sub_register()
114 	return driver_register(&sub->drv);  in bttv_sub_register()
118 int bttv_sub_unregister(struct bttv_sub_driver *sub)  in bttv_sub_unregister()  argument
120 	driver_unregister(&sub->drv);  in bttv_sub_unregister()
125 /* ----------------------------------------------------------------------- */
134 	spin_lock_irqsave(&btv->gpio_lock,flags);  in bttv_gpio_inout()
139 	spin_unlock_irqrestore(&btv->gpio_lock,flags);  in bttv_gpio_inout()
164 	spin_lock_irqsave(&btv->gpio_lock,flags);  in bttv_gpio_bits()
169 	spin_unlock_irqrestore(&btv->gpio_lock,flags);  in bttv_gpio_bits()