1/*
2
3    bttv-gpio.c  --  gpio sub drivers
4
5    sysfs-based sub driver interface for bttv
6    mainly intended 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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
30
31#include <linux/module.h>
32#include <linux/init.h>
33#include <linux/delay.h>
34#include <linux/device.h>
35#include <linux/slab.h>
36#include <asm/io.h>
37
38#include "bttvp.h"
39
40/* ----------------------------------------------------------------------- */
41/* internal: the bttv "bus"                                                */
42
43static int bttv_sub_bus_match(struct device *dev, struct device_driver *drv)
44{
45	struct bttv_sub_driver *sub = to_bttv_sub_drv(drv);
46	int len = strlen(sub->wanted);
47
48	if (0 == strncmp(dev_name(dev), sub->wanted, len))
49		return 1;
50	return 0;
51}
52
53static int bttv_sub_probe(struct device *dev)
54{
55	struct bttv_sub_device *sdev = to_bttv_sub_dev(dev);
56	struct bttv_sub_driver *sub = to_bttv_sub_drv(dev->driver);
57
58	return sub->probe ? sub->probe(sdev) : -ENODEV;
59}
60
61static int bttv_sub_remove(struct device *dev)
62{
63	struct bttv_sub_device *sdev = to_bttv_sub_dev(dev);
64	struct bttv_sub_driver *sub = to_bttv_sub_drv(dev->driver);
65
66	if (sub->remove)
67		sub->remove(sdev);
68	return 0;
69}
70
71struct bus_type bttv_sub_bus_type = {
72	.name   = "bttv-sub",
73	.match  = &bttv_sub_bus_match,
74	.probe  = bttv_sub_probe,
75	.remove = bttv_sub_remove,
76};
77
78static void release_sub_device(struct device *dev)
79{
80	struct bttv_sub_device *sub = to_bttv_sub_dev(dev);
81	kfree(sub);
82}
83
84int bttv_sub_add_device(struct bttv_core *core, char *name)
85{
86	struct bttv_sub_device *sub;
87	int err;
88
89	sub = kzalloc(sizeof(*sub),GFP_KERNEL);
90	if (NULL == sub)
91		return -ENOMEM;
92
93	sub->core        = core;
94	sub->dev.parent  = &core->pci->dev;
95	sub->dev.bus     = &bttv_sub_bus_type;
96	sub->dev.release = release_sub_device;
97	dev_set_name(&sub->dev, "%s%d", name, core->nr);
98
99	err = device_register(&sub->dev);
100	if (0 != err) {
101		put_device(&sub->dev);
102		return err;
103	}
104	pr_info("%d: add subdevice \"%s\"\n", core->nr, dev_name(&sub->dev));
105	list_add_tail(&sub->list,&core->subs);
106	return 0;
107}
108
109int bttv_sub_del_devices(struct bttv_core *core)
110{
111	struct bttv_sub_device *sub, *save;
112
113	list_for_each_entry_safe(sub, save, &core->subs, list) {
114		list_del(&sub->list);
115		device_unregister(&sub->dev);
116	}
117	return 0;
118}
119
120/* ----------------------------------------------------------------------- */
121/* external: sub-driver register/unregister                                */
122
123int bttv_sub_register(struct bttv_sub_driver *sub, char *wanted)
124{
125	sub->drv.bus = &bttv_sub_bus_type;
126	snprintf(sub->wanted,sizeof(sub->wanted),"%s",wanted);
127	return driver_register(&sub->drv);
128}
129EXPORT_SYMBOL(bttv_sub_register);
130
131int bttv_sub_unregister(struct bttv_sub_driver *sub)
132{
133	driver_unregister(&sub->drv);
134	return 0;
135}
136EXPORT_SYMBOL(bttv_sub_unregister);
137
138/* ----------------------------------------------------------------------- */
139/* external: gpio access functions                                         */
140
141void bttv_gpio_inout(struct bttv_core *core, u32 mask, u32 outbits)
142{
143	struct bttv *btv = container_of(core, struct bttv, c);
144	unsigned long flags;
145	u32 data;
146
147	spin_lock_irqsave(&btv->gpio_lock,flags);
148	data = btread(BT848_GPIO_OUT_EN);
149	data = data & ~mask;
150	data = data | (mask & outbits);
151	btwrite(data,BT848_GPIO_OUT_EN);
152	spin_unlock_irqrestore(&btv->gpio_lock,flags);
153}
154
155u32 bttv_gpio_read(struct bttv_core *core)
156{
157	struct bttv *btv = container_of(core, struct bttv, c);
158	u32 value;
159
160	value = btread(BT848_GPIO_DATA);
161	return value;
162}
163
164void bttv_gpio_write(struct bttv_core *core, u32 value)
165{
166	struct bttv *btv = container_of(core, struct bttv, c);
167
168	btwrite(value,BT848_GPIO_DATA);
169}
170
171void bttv_gpio_bits(struct bttv_core *core, u32 mask, u32 bits)
172{
173	struct bttv *btv = container_of(core, struct bttv, c);
174	unsigned long flags;
175	u32 data;
176
177	spin_lock_irqsave(&btv->gpio_lock,flags);
178	data = btread(BT848_GPIO_DATA);
179	data = data & ~mask;
180	data = data | (mask & bits);
181	btwrite(data,BT848_GPIO_DATA);
182	spin_unlock_irqrestore(&btv->gpio_lock,flags);
183}
184