3 bttv-gpio.c -- gpio sub drivers
5 sysfs-based sub driver interface for bttv
6 mainly intented for gpio access
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>
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.
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.
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.
29 #include <linux/module.h>
30 #include <linux/init.h>
31 #include <linux/delay.h>
32 #include <linux/device.h>
37 /* ----------------------------------------------------------------------- */
38 /* internal: the bttv "bus" */
40 static int bttv_sub_bus_match(struct device *dev, struct device_driver *drv)
42 struct bttv_sub_driver *sub = to_bttv_sub_drv(drv);
43 int len = strlen(sub->wanted);
45 if (0 == strncmp(dev->bus_id, sub->wanted, len))
50 struct bus_type bttv_sub_bus_type = {
52 .match = &bttv_sub_bus_match,
54 EXPORT_SYMBOL(bttv_sub_bus_type);
56 static void release_sub_device(struct device *dev)
58 struct bttv_sub_device *sub = to_bttv_sub_dev(dev);
62 int bttv_sub_add_device(struct bttv_core *core, char *name)
64 struct bttv_sub_device *sub;
67 sub = kmalloc(sizeof(*sub),GFP_KERNEL);
70 memset(sub,0,sizeof(*sub));
73 sub->dev.parent = &core->pci->dev;
74 sub->dev.bus = &bttv_sub_bus_type;
75 sub->dev.release = release_sub_device;
76 snprintf(sub->dev.bus_id,sizeof(sub->dev.bus_id),"%s%d",
79 err = device_register(&sub->dev);
84 printk("bttv%d: add subdevice \"%s\"\n", core->nr, sub->dev.bus_id);
85 list_add_tail(&sub->list,&core->subs);
89 int bttv_sub_del_devices(struct bttv_core *core)
91 struct bttv_sub_device *sub;
92 struct list_head *item,*save;
94 list_for_each_safe(item,save,&core->subs) {
95 sub = list_entry(item,struct bttv_sub_device,list);
97 device_unregister(&sub->dev);
102 void bttv_gpio_irq(struct bttv_core *core)
104 struct bttv_sub_driver *drv;
105 struct bttv_sub_device *dev;
106 struct list_head *item;
108 list_for_each(item,&core->subs) {
109 dev = list_entry(item,struct bttv_sub_device,list);
110 drv = to_bttv_sub_drv(dev->dev.driver);
111 if (drv && drv->gpio_irq)
116 int bttv_any_irq(struct bttv_core *core)
118 struct bttv_sub_driver *drv;
119 struct bttv_sub_device *dev;
120 struct list_head *item;
123 list_for_each(item,&core->subs) {
124 dev = list_entry(item,struct bttv_sub_device,list);
125 drv = to_bttv_sub_drv(dev->dev.driver);
126 if (drv && drv->any_irq) {
127 if (drv->any_irq(dev))
134 /* ----------------------------------------------------------------------- */
135 /* external: sub-driver register/unregister */
137 int bttv_sub_register(struct bttv_sub_driver *sub, char *wanted)
139 sub->drv.bus = &bttv_sub_bus_type;
140 snprintf(sub->wanted,sizeof(sub->wanted),"%s",wanted);
141 return driver_register(&sub->drv);
143 EXPORT_SYMBOL(bttv_sub_register);
145 int bttv_sub_unregister(struct bttv_sub_driver *sub)
147 driver_unregister(&sub->drv);
150 EXPORT_SYMBOL(bttv_sub_unregister);
152 /* ----------------------------------------------------------------------- */
153 /* external: gpio access functions */
155 void bttv_gpio_inout(struct bttv_core *core, u32 mask, u32 outbits)
157 struct bttv *btv = container_of(core, struct bttv, c);
161 spin_lock_irqsave(&btv->gpio_lock,flags);
162 data = btread(BT848_GPIO_OUT_EN);
164 data = data | (mask & outbits);
165 btwrite(data,BT848_GPIO_OUT_EN);
166 spin_unlock_irqrestore(&btv->gpio_lock,flags);
168 EXPORT_SYMBOL(bttv_gpio_inout);
170 u32 bttv_gpio_read(struct bttv_core *core)
172 struct bttv *btv = container_of(core, struct bttv, c);
175 value = btread(BT848_GPIO_DATA);
178 EXPORT_SYMBOL(bttv_gpio_read);
180 void bttv_gpio_write(struct bttv_core *core, u32 value)
182 struct bttv *btv = container_of(core, struct bttv, c);
184 btwrite(value,BT848_GPIO_DATA);
186 EXPORT_SYMBOL(bttv_gpio_write);
188 void bttv_gpio_bits(struct bttv_core *core, u32 mask, u32 bits)
190 struct bttv *btv = container_of(core, struct bttv, c);
194 spin_lock_irqsave(&btv->gpio_lock,flags);
195 data = btread(BT848_GPIO_DATA);
197 data = data | (mask & bits);
198 btwrite(data,BT848_GPIO_DATA);
199 spin_unlock_irqrestore(&btv->gpio_lock,flags);
201 EXPORT_SYMBOL(bttv_gpio_bits);