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// SPDX-License-Identifier: GPL-2.0-or-later
/*
bttv-gpio.c -- gpio sub drivers
sysfs-based sub driver interface for bttv
mainly intended 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>
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/slab.h>
#include <asm/io.h>
#include "bttvp.h"
/* ----------------------------------------------------------------------- */
/* internal: the bttv "bus" */
static int bttv_sub_bus_match(struct device *dev, const struct device_driver *drv)
{
const struct bttv_sub_driver *sub = to_bttv_sub_drv(drv);
int len = strlen(sub->wanted);
if (0 == strncmp(dev_name(dev), 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 void 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);
}
const 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;
dev_set_name(&sub->dev, "%s%d", name, core->nr);
err = device_register(&sub->dev);
if (0 != err) {
put_device(&sub->dev);
return err;
}
pr_info("%d: add subdevice \"%s\"\n", core->nr, dev_name(&sub->dev));
list_add_tail(&sub->list,&core->subs);
return 0;
}
int bttv_sub_del_devices(struct bttv_core *core)
{
struct bttv_sub_device *sub, *save;
list_for_each_entry_safe(sub, save, &core->subs, 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);
}
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