bttv-gpio.c revision af128a102c4aee994b4ff6e422b3cfab17127578 
1/*
2
3    bttv-gpio.c  --  gpio sub drivers
4
5    sysfs-based sub driver interface for bttv
6    mainly intented for gpio access
7
8
9    Copyright (C) 1996,97,98 Ralph  Metzler (rjkm@thp.uni-koeln.de)
10			   & Marcus Metzler (mocm@thp.uni-koeln.de)
11    (c) 1999-2003 Gerd Knorr <kraxel@bytesex.org>
12
13    This program is free software; you can redistribute it and/or modify
14    it under the terms of the GNU General Public License as published by
15    the Free Software Foundation; either version 2 of the License, or
16    (at your option) any later version.
17
18    This program is distributed in the hope that it will be useful,
19    but WITHOUT ANY WARRANTY; without even the implied warranty of
20    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
21    GNU General Public License for more details.
22
23    You should have received a copy of the GNU General Public License
24    along with this program; if not, write to the Free Software
25    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
26
27*/
28
29#include <linux/module.h>
30#include <linux/init.h>
31#include <linux/delay.h>
32#include <linux/device.h>
33#include <asm/io.h>
34
35#include "bttvp.h"
36
37/* ----------------------------------------------------------------------- */
38/* internal: the bttv "bus"                                                */
39
40static int bttv_sub_bus_match(struct device *dev, struct device_driver *drv)
41{
42	struct bttv_sub_driver *sub = to_bttv_sub_drv(drv);
43	int len = strlen(sub->wanted);
44
45	if (0 == strncmp(dev_name(dev), sub->wanted, len))
46		return 1;
47	return 0;
48}
49
50static int bttv_sub_probe(struct device *dev)
51{
52	struct bttv_sub_device *sdev = to_bttv_sub_dev(dev);
53	struct bttv_sub_driver *sub = to_bttv_sub_drv(dev->driver);
54
55	return sub->probe ? sub->probe(sdev) : -ENODEV;
56}
57
58static int bttv_sub_remove(struct device *dev)
59{
60	struct bttv_sub_device *sdev = to_bttv_sub_dev(dev);
61	struct bttv_sub_driver *sub = to_bttv_sub_drv(dev->driver);
62
63	if (sub->remove)
64		sub->remove(sdev);
65	return 0;
66}
67
68struct bus_type bttv_sub_bus_type = {
69	.name   = "bttv-sub",
70	.match  = &bttv_sub_bus_match,
71	.probe  = bttv_sub_probe,
72	.remove = bttv_sub_remove,
73};
74
75static void release_sub_device(struct device *dev)
76{
77	struct bttv_sub_device *sub = to_bttv_sub_dev(dev);
78	kfree(sub);
79}
80
81int bttv_sub_add_device(struct bttv_core *core, char *name)
82{
83	struct bttv_sub_device *sub;
84	int err;
85
86	sub = kzalloc(sizeof(*sub),GFP_KERNEL);
87	if (NULL == sub)
88		return -ENOMEM;
89
90	sub->core        = core;
91	sub->dev.parent  = &core->pci->dev;
92	sub->dev.bus     = &bttv_sub_bus_type;
93	sub->dev.release = release_sub_device;
94	dev_set_name(&sub->dev, "%s%d", name, core->nr);
95
96	err = device_register(&sub->dev);
97	if (0 != err) {
98		kfree(sub);
99		return err;
100	}
101	printk("bttv%d: add subdevice \"%s\"\n", core->nr, dev_name(&sub->dev));
102	list_add_tail(&sub->list,&core->subs);
103	return 0;
104}
105
106int bttv_sub_del_devices(struct bttv_core *core)
107{
108	struct bttv_sub_device *sub, *save;
109
110	list_for_each_entry_safe(sub, save, &core->subs, list) {
111		list_del(&sub->list);
112		device_unregister(&sub->dev);
113	}
114	return 0;
115}
116
117/* ----------------------------------------------------------------------- */
118/* external: sub-driver register/unregister                                */
119
120int bttv_sub_register(struct bttv_sub_driver *sub, char *wanted)
121{
122	sub->drv.bus = &bttv_sub_bus_type;
123	snprintf(sub->wanted,sizeof(sub->wanted),"%s",wanted);
124	return driver_register(&sub->drv);
125}
126EXPORT_SYMBOL(bttv_sub_register);
127
128int bttv_sub_unregister(struct bttv_sub_driver *sub)
129{
130	driver_unregister(&sub->drv);
131	return 0;
132}
133EXPORT_SYMBOL(bttv_sub_unregister);
134
135/* ----------------------------------------------------------------------- */
136/* external: gpio access functions                                         */
137
138void bttv_gpio_inout(struct bttv_core *core, u32 mask, u32 outbits)
139{
140	struct bttv *btv = container_of(core, struct bttv, c);
141	unsigned long flags;
142	u32 data;
143
144	spin_lock_irqsave(&btv->gpio_lock,flags);
145	data = btread(BT848_GPIO_OUT_EN);
146	data = data & ~mask;
147	data = data | (mask & outbits);
148	btwrite(data,BT848_GPIO_OUT_EN);
149	spin_unlock_irqrestore(&btv->gpio_lock,flags);
150}
151
152u32 bttv_gpio_read(struct bttv_core *core)
153{
154	struct bttv *btv = container_of(core, struct bttv, c);
155	u32 value;
156
157	value = btread(BT848_GPIO_DATA);
158	return value;
159}
160
161void bttv_gpio_write(struct bttv_core *core, u32 value)
162{
163	struct bttv *btv = container_of(core, struct bttv, c);
164
165	btwrite(value,BT848_GPIO_DATA);
166}
167
168void bttv_gpio_bits(struct bttv_core *core, u32 mask, u32 bits)
169{
170	struct bttv *btv = container_of(core, struct bttv, c);
171	unsigned long flags;
172	u32 data;
173
174	spin_lock_irqsave(&btv->gpio_lock,flags);
175	data = btread(BT848_GPIO_DATA);
176	data = data & ~mask;
177	data = data | (mask & bits);
178	btwrite(data,BT848_GPIO_DATA);
179	spin_unlock_irqrestore(&btv->gpio_lock,flags);
180}
181
182/*
183 * Local variables:
184 * c-basic-offset: 8
185 * End:
186 */
187