Loading...
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 | /*
bttv-gpio.c -- gpio sub drivers
sysfs-based sub driver interface for bttv
mainly intented for gpio access
Copyright (C) 1996,97,98 Ralph Metzler (rjkm@thp.uni-koeln.de)
& Marcus Metzler (mocm@thp.uni-koeln.de)
(c) 1999-2003 Gerd Knorr <kraxel@bytesex.org>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <asm/io.h>
#include "bttvp.h"
/* ----------------------------------------------------------------------- */
/* internal: the bttv "bus" */
static int bttv_sub_bus_match(struct device *dev, struct device_driver *drv)
{
struct bttv_sub_driver *sub = to_bttv_sub_drv(drv);
int len = strlen(sub->wanted);
if (0 == strncmp(dev->bus_id, sub->wanted, len))
return 1;
return 0;
}
static int bttv_sub_probe(struct device *dev)
{
struct bttv_sub_device *sdev = to_bttv_sub_dev(dev);
struct bttv_sub_driver *sub = to_bttv_sub_drv(dev->driver);
return sub->probe ? sub->probe(sdev) : -ENODEV;
}
static int bttv_sub_remove(struct device *dev)
{
struct bttv_sub_device *sdev = to_bttv_sub_dev(dev);
struct bttv_sub_driver *sub = to_bttv_sub_drv(dev->driver);
if (sub->remove)
sub->remove(sdev);
return 0;
}
struct bus_type bttv_sub_bus_type = {
.name = "bttv-sub",
.match = &bttv_sub_bus_match,
.probe = bttv_sub_probe,
.remove = bttv_sub_remove,
};
static void release_sub_device(struct device *dev)
{
struct bttv_sub_device *sub = to_bttv_sub_dev(dev);
kfree(sub);
}
int bttv_sub_add_device(struct bttv_core *core, char *name)
{
struct bttv_sub_device *sub;
int err;
sub = kzalloc(sizeof(*sub),GFP_KERNEL);
if (NULL == sub)
return -ENOMEM;
sub->core = core;
sub->dev.parent = &core->pci->dev;
sub->dev.bus = &bttv_sub_bus_type;
sub->dev.release = release_sub_device;
snprintf(sub->dev.bus_id,sizeof(sub->dev.bus_id),"%s%d",
name, core->nr);
err = device_register(&sub->dev);
if (0 != err) {
kfree(sub);
return err;
}
printk("bttv%d: add subdevice \"%s\"\n", core->nr, sub->dev.bus_id);
list_add_tail(&sub->list,&core->subs);
return 0;
}
int bttv_sub_del_devices(struct bttv_core *core)
{
struct bttv_sub_device *sub;
struct list_head *item,*save;
list_for_each_safe(item,save,&core->subs) {
sub = list_entry(item,struct bttv_sub_device,list);
list_del(&sub->list);
device_unregister(&sub->dev);
}
return 0;
}
/* ----------------------------------------------------------------------- */
/* external: sub-driver register/unregister */
int bttv_sub_register(struct bttv_sub_driver *sub, char *wanted)
{
sub->drv.bus = &bttv_sub_bus_type;
snprintf(sub->wanted,sizeof(sub->wanted),"%s",wanted);
return driver_register(&sub->drv);
}
EXPORT_SYMBOL(bttv_sub_register);
int bttv_sub_unregister(struct bttv_sub_driver *sub)
{
driver_unregister(&sub->drv);
return 0;
}
EXPORT_SYMBOL(bttv_sub_unregister);
/* ----------------------------------------------------------------------- */
/* external: gpio access functions */
void bttv_gpio_inout(struct bttv_core *core, u32 mask, u32 outbits)
{
struct bttv *btv = container_of(core, struct bttv, c);
unsigned long flags;
u32 data;
spin_lock_irqsave(&btv->gpio_lock,flags);
data = btread(BT848_GPIO_OUT_EN);
data = data & ~mask;
data = data | (mask & outbits);
btwrite(data,BT848_GPIO_OUT_EN);
spin_unlock_irqrestore(&btv->gpio_lock,flags);
}
u32 bttv_gpio_read(struct bttv_core *core)
{
struct bttv *btv = container_of(core, struct bttv, c);
u32 value;
value = btread(BT848_GPIO_DATA);
return value;
}
void bttv_gpio_write(struct bttv_core *core, u32 value)
{
struct bttv *btv = container_of(core, struct bttv, c);
btwrite(value,BT848_GPIO_DATA);
}
void bttv_gpio_bits(struct bttv_core *core, u32 mask, u32 bits)
{
struct bttv *btv = container_of(core, struct bttv, c);
unsigned long flags;
u32 data;
spin_lock_irqsave(&btv->gpio_lock,flags);
data = btread(BT848_GPIO_DATA);
data = data & ~mask;
data = data | (mask & bits);
btwrite(data,BT848_GPIO_DATA);
spin_unlock_irqrestore(&btv->gpio_lock,flags);
}
/*
* Local variables:
* c-basic-offset: 8
* End:
*/
|