Commit | Line | Data |
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1da177e4 | 1 | /* |
1da177e4 LT |
2 | |
3 | bttv-gpio.c -- gpio sub drivers | |
4 | ||
5 | sysfs-based sub driver interface for bttv | |
25985edc | 6 | mainly intended for gpio access |
1da177e4 LT |
7 | |
8 | ||
9 | Copyright (C) 1996,97,98 Ralph Metzler (rjkm@thp.uni-koeln.de) | |
4ac97914 | 10 | & Marcus Metzler (mocm@thp.uni-koeln.de) |
1da177e4 LT |
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> | |
5a0e3ad6 | 33 | #include <linux/slab.h> |
1da177e4 LT |
34 | #include <asm/io.h> |
35 | ||
36 | #include "bttvp.h" | |
37 | ||
38 | /* ----------------------------------------------------------------------- */ | |
39 | /* internal: the bttv "bus" */ | |
40 | ||
41 | static int bttv_sub_bus_match(struct device *dev, struct device_driver *drv) | |
42 | { | |
43 | struct bttv_sub_driver *sub = to_bttv_sub_drv(drv); | |
44 | int len = strlen(sub->wanted); | |
45 | ||
af128a10 | 46 | if (0 == strncmp(dev_name(dev), sub->wanted, len)) |
1da177e4 LT |
47 | return 1; |
48 | return 0; | |
49 | } | |
50 | ||
348290a4 RK |
51 | static int bttv_sub_probe(struct device *dev) |
52 | { | |
53 | struct bttv_sub_device *sdev = to_bttv_sub_dev(dev); | |
54 | struct bttv_sub_driver *sub = to_bttv_sub_drv(dev->driver); | |
55 | ||
56 | return sub->probe ? sub->probe(sdev) : -ENODEV; | |
57 | } | |
58 | ||
59 | static int bttv_sub_remove(struct device *dev) | |
60 | { | |
61 | struct bttv_sub_device *sdev = to_bttv_sub_dev(dev); | |
62 | struct bttv_sub_driver *sub = to_bttv_sub_drv(dev->driver); | |
63 | ||
64 | if (sub->remove) | |
65 | sub->remove(sdev); | |
66 | return 0; | |
67 | } | |
68 | ||
1da177e4 | 69 | struct bus_type bttv_sub_bus_type = { |
348290a4 RK |
70 | .name = "bttv-sub", |
71 | .match = &bttv_sub_bus_match, | |
72 | .probe = bttv_sub_probe, | |
73 | .remove = bttv_sub_remove, | |
1da177e4 | 74 | }; |
1da177e4 LT |
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 | ||
7408187d | 87 | sub = kzalloc(sizeof(*sub),GFP_KERNEL); |
1da177e4 LT |
88 | if (NULL == sub) |
89 | return -ENOMEM; | |
1da177e4 LT |
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; | |
af128a10 | 95 | dev_set_name(&sub->dev, "%s%d", name, core->nr); |
1da177e4 LT |
96 | |
97 | err = device_register(&sub->dev); | |
98 | if (0 != err) { | |
99 | kfree(sub); | |
100 | return err; | |
101 | } | |
af128a10 | 102 | printk("bttv%d: add subdevice \"%s\"\n", core->nr, dev_name(&sub->dev)); |
1da177e4 LT |
103 | list_add_tail(&sub->list,&core->subs); |
104 | return 0; | |
105 | } | |
106 | ||
107 | int bttv_sub_del_devices(struct bttv_core *core) | |
108 | { | |
a991f44b | 109 | struct bttv_sub_device *sub, *save; |
1da177e4 | 110 | |
a991f44b | 111 | list_for_each_entry_safe(sub, save, &core->subs, list) { |
1da177e4 LT |
112 | list_del(&sub->list); |
113 | device_unregister(&sub->dev); | |
114 | } | |
115 | return 0; | |
116 | } | |
117 | ||
1da177e4 LT |
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 | } | |
1da177e4 LT |
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 | } | |
1da177e4 LT |
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 | } | |
1da177e4 LT |
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 | } | |
1da177e4 LT |
182 | |
183 | /* | |
184 | * Local variables: | |
185 | * c-basic-offset: 8 | |
186 | * End: | |
187 | */ |