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 EXPORT_SYMBOL(bttv_sub_bus_type);
75
76 static void release_sub_device(struct device *dev)
77 {
78 struct bttv_sub_device *sub = to_bttv_sub_dev(dev);
79 kfree(sub);
80 }
81
82 int bttv_sub_add_device(struct bttv_core *core, char *name)
83 {
84 struct bttv_sub_device *sub;
85 int err;
86
87 sub = kzalloc(sizeof(*sub),GFP_KERNEL);
88 if (NULL == sub)
89 return -ENOMEM;
90
91 sub->core = core;
92 sub->dev.parent = &core->pci->dev;
93 sub->dev.bus = &bttv_sub_bus_type;
94 sub->dev.release = release_sub_device;
95 snprintf(sub->dev.bus_id,sizeof(sub->dev.bus_id),"%s%d",
96 name, core->nr);
97
98 err = device_register(&sub->dev);
99 if (0 != err) {
100 kfree(sub);
101 return err;
102 }
103 printk("bttv%d: add subdevice \"%s\"\n", core->nr, sub->dev.bus_id);
104 list_add_tail(&sub->list,&core->subs);
105 return 0;
106 }
107
108 int bttv_sub_del_devices(struct bttv_core *core)
109 {
110 struct bttv_sub_device *sub;
111 struct list_head *item,*save;
112
113 list_for_each_safe(item,save,&core->subs) {
114 sub = list_entry(item,struct bttv_sub_device,list);
115 list_del(&sub->list);
116 device_unregister(&sub->dev);
117 }
118 return 0;
119 }
120
121 void bttv_gpio_irq(struct bttv_core *core)
122 {
123 struct bttv_sub_driver *drv;
124 struct bttv_sub_device *dev;
125 struct list_head *item;
126
127 list_for_each(item,&core->subs) {
128 dev = list_entry(item,struct bttv_sub_device,list);
129 drv = to_bttv_sub_drv(dev->dev.driver);
130 if (drv && drv->gpio_irq)
131 drv->gpio_irq(dev);
132 }
133 }
134
135 /* ----------------------------------------------------------------------- */
136 /* external: sub-driver register/unregister */
137
138 int bttv_sub_register(struct bttv_sub_driver *sub, char *wanted)
139 {
140 sub->drv.bus = &bttv_sub_bus_type;
141 snprintf(sub->wanted,sizeof(sub->wanted),"%s",wanted);
142 return driver_register(&sub->drv);
143 }
144 EXPORT_SYMBOL(bttv_sub_register);
145
146 int bttv_sub_unregister(struct bttv_sub_driver *sub)
147 {
148 driver_unregister(&sub->drv);
149 return 0;
150 }
151 EXPORT_SYMBOL(bttv_sub_unregister);
152
153 /* ----------------------------------------------------------------------- */
154 /* external: gpio access functions */
155
156 void bttv_gpio_inout(struct bttv_core *core, u32 mask, u32 outbits)
157 {
158 struct bttv *btv = container_of(core, struct bttv, c);
159 unsigned long flags;
160 u32 data;
161
162 spin_lock_irqsave(&btv->gpio_lock,flags);
163 data = btread(BT848_GPIO_OUT_EN);
164 data = data & ~mask;
165 data = data | (mask & outbits);
166 btwrite(data,BT848_GPIO_OUT_EN);
167 spin_unlock_irqrestore(&btv->gpio_lock,flags);
168 }
169 EXPORT_SYMBOL(bttv_gpio_inout);
170
171 u32 bttv_gpio_read(struct bttv_core *core)
172 {
173 struct bttv *btv = container_of(core, struct bttv, c);
174 u32 value;
175
176 value = btread(BT848_GPIO_DATA);
177 return value;
178 }
179 EXPORT_SYMBOL(bttv_gpio_read);
180
181 void bttv_gpio_write(struct bttv_core *core, u32 value)
182 {
183 struct bttv *btv = container_of(core, struct bttv, c);
184
185 btwrite(value,BT848_GPIO_DATA);
186 }
187 EXPORT_SYMBOL(bttv_gpio_write);
188
189 void bttv_gpio_bits(struct bttv_core *core, u32 mask, u32 bits)
190 {
191 struct bttv *btv = container_of(core, struct bttv, c);
192 unsigned long flags;
193 u32 data;
194
195 spin_lock_irqsave(&btv->gpio_lock,flags);
196 data = btread(BT848_GPIO_DATA);
197 data = data & ~mask;
198 data = data | (mask & bits);
199 btwrite(data,BT848_GPIO_DATA);
200 spin_unlock_irqrestore(&btv->gpio_lock,flags);
201 }
202 EXPORT_SYMBOL(bttv_gpio_bits);
203
204 /*
205 * Local variables:
206 * c-basic-offset: 8
207 * End:
208 */
209
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