bttv-gpio.c 5.3 KB
Newer Older
L
Linus Torvalds 已提交
1 2 3 4 5 6 7 8 9
/*

    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)
10
			   & Marcus Metzler (mocm@thp.uni-koeln.de)
L
Linus Torvalds 已提交
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
    (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;
}

50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67
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;
}

L
Linus Torvalds 已提交
68
struct bus_type bttv_sub_bus_type = {
69 70 71 72
	.name   = "bttv-sub",
	.match  = &bttv_sub_bus_match,
	.probe  = bttv_sub_probe,
	.remove = bttv_sub_remove,
L
Linus Torvalds 已提交
73 74 75 76 77 78 79 80 81 82 83 84 85 86
};
EXPORT_SYMBOL(bttv_sub_bus_type);

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;

P
 
Panagiotis Issaris 已提交
87
	sub = kzalloc(sizeof(*sub),GFP_KERNEL);
L
Linus Torvalds 已提交
88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208
	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;
}

void bttv_gpio_irq(struct bttv_core *core)
{
	struct bttv_sub_driver *drv;
	struct bttv_sub_device *dev;
	struct list_head *item;

	list_for_each(item,&core->subs) {
		dev = list_entry(item,struct bttv_sub_device,list);
		drv = to_bttv_sub_drv(dev->dev.driver);
		if (drv && drv->gpio_irq)
			drv->gpio_irq(dev);
	}
}

/* ----------------------------------------------------------------------- */
/* 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);
}
EXPORT_SYMBOL(bttv_gpio_inout);

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;
}
EXPORT_SYMBOL(bttv_gpio_read);

void bttv_gpio_write(struct bttv_core *core, u32 value)
{
	struct bttv *btv = container_of(core, struct bttv, c);

	btwrite(value,BT848_GPIO_DATA);
}
EXPORT_SYMBOL(bttv_gpio_write);

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);
}
EXPORT_SYMBOL(bttv_gpio_bits);

/*
 * Local variables:
 * c-basic-offset: 8
 * End:
 */