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
40 static 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->bus_id, sub->wanted, len))
46 return 1;
47 return 0;
48 }
49
50 static 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
58 static 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
68 struct 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
75 static void release_sub_device(struct device *dev)
76 {
77 struct bttv_sub_device *sub = to_bttv_sub_dev(dev);
78 kfree(sub);
79 }
80
81 int 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 snprintf(sub->dev.bus_id,sizeof(sub->dev.bus_id),"%s%d",
95 name, core->nr);
96
97 err = device_register(&sub->dev);
98 if (0 != err) {
99 kfree(sub);
100 return err;
101 }
102 printk("bttv%d: add subdevice \"%s\"\n", core->nr, sub->dev.bus_id);
103 list_add_tail(&sub->list,&core->subs);
104 return 0;
105 }
106
107 int bttv_sub_del_devices(struct bttv_core *core)
108 {
109 struct bttv_sub_device *sub, *save;
110
111 list_for_each_entry_safe(sub, save, &core->subs, list) {
112 list_del(&sub->list);
113 device_unregister(&sub->dev);
114 }
115 return 0;
116 }
117
118 /* ----------------------------------------------------------------------- */
119 /* external: sub-driver register/unregister */
120
121 int bttv_sub_register(struct bttv_sub_driver *sub, char *wanted)
122 {
123 sub->drv.bus = &bttv_sub_bus_type;
124 snprintf(sub->wanted,sizeof(sub->wanted),"%s",wanted);
125 return driver_register(&sub->drv);
126 }
127 EXPORT_SYMBOL(bttv_sub_register);
128
129 int bttv_sub_unregister(struct bttv_sub_driver *sub)
130 {
131 driver_unregister(&sub->drv);
132 return 0;
133 }
134 EXPORT_SYMBOL(bttv_sub_unregister);
135
136 /* ----------------------------------------------------------------------- */
137 /* external: gpio access functions */
138
139 void bttv_gpio_inout(struct bttv_core *core, u32 mask, u32 outbits)
140 {
141 struct bttv *btv = container_of(core, struct bttv, c);
142 unsigned long flags;
143 u32 data;
144
145 spin_lock_irqsave(&btv->gpio_lock,flags);
146 data = btread(BT848_GPIO_OUT_EN);
147 data = data & ~mask;
148 data = data | (mask & outbits);
149 btwrite(data,BT848_GPIO_OUT_EN);
150 spin_unlock_irqrestore(&btv->gpio_lock,flags);
151 }
152
153 u32 bttv_gpio_read(struct bttv_core *core)
154 {
155 struct bttv *btv = container_of(core, struct bttv, c);
156 u32 value;
157
158 value = btread(BT848_GPIO_DATA);
159 return value;
160 }
161
162 void bttv_gpio_write(struct bttv_core *core, u32 value)
163 {
164 struct bttv *btv = container_of(core, struct bttv, c);
165
166 btwrite(value,BT848_GPIO_DATA);
167 }
168
169 void bttv_gpio_bits(struct bttv_core *core, u32 mask, u32 bits)
170 {
171 struct bttv *btv = container_of(core, struct bttv, c);
172 unsigned long flags;
173 u32 data;
174
175 spin_lock_irqsave(&btv->gpio_lock,flags);
176 data = btread(BT848_GPIO_DATA);
177 data = data & ~mask;
178 data = data | (mask & bits);
179 btwrite(data,BT848_GPIO_DATA);
180 spin_unlock_irqrestore(&btv->gpio_lock,flags);
181 }
182
183 /*
184 * Local variables:
185 * c-basic-offset: 8
186 * End:
187 */
188
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