184 lines
4.8 KiB
C
184 lines
4.8 KiB
C
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/*
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bttv-gpio.c -- gpio sub drivers
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sysfs-based sub driver interface for bttv
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mainly intended for gpio access
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Copyright (C) 1996,97,98 Ralph Metzler (rjkm@thp.uni-koeln.de)
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& Marcus Metzler (mocm@thp.uni-koeln.de)
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(c) 1999-2003 Gerd Knorr <kraxel@bytesex.org>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/slab.h>
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#include <asm/io.h>
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#include "bttvp.h"
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/* ----------------------------------------------------------------------- */
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/* internal: the bttv "bus" */
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static int bttv_sub_bus_match(struct device *dev, struct device_driver *drv)
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{
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struct bttv_sub_driver *sub = to_bttv_sub_drv(drv);
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int len = strlen(sub->wanted);
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if (0 == strncmp(dev_name(dev), sub->wanted, len))
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return 1;
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return 0;
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}
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static int bttv_sub_probe(struct device *dev)
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{
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struct bttv_sub_device *sdev = to_bttv_sub_dev(dev);
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struct bttv_sub_driver *sub = to_bttv_sub_drv(dev->driver);
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return sub->probe ? sub->probe(sdev) : -ENODEV;
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}
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static int bttv_sub_remove(struct device *dev)
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{
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struct bttv_sub_device *sdev = to_bttv_sub_dev(dev);
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struct bttv_sub_driver *sub = to_bttv_sub_drv(dev->driver);
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if (sub->remove)
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sub->remove(sdev);
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return 0;
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}
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struct bus_type bttv_sub_bus_type = {
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.name = "bttv-sub",
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.match = &bttv_sub_bus_match,
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.probe = bttv_sub_probe,
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.remove = bttv_sub_remove,
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};
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static void release_sub_device(struct device *dev)
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{
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struct bttv_sub_device *sub = to_bttv_sub_dev(dev);
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kfree(sub);
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}
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int bttv_sub_add_device(struct bttv_core *core, char *name)
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{
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struct bttv_sub_device *sub;
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int err;
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sub = kzalloc(sizeof(*sub),GFP_KERNEL);
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if (NULL == sub)
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return -ENOMEM;
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sub->core = core;
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sub->dev.parent = &core->pci->dev;
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sub->dev.bus = &bttv_sub_bus_type;
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sub->dev.release = release_sub_device;
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dev_set_name(&sub->dev, "%s%d", name, core->nr);
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err = device_register(&sub->dev);
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if (0 != err) {
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put_device(&sub->dev);
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return err;
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}
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pr_info("%d: add subdevice \"%s\"\n", core->nr, dev_name(&sub->dev));
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list_add_tail(&sub->list,&core->subs);
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return 0;
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}
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int bttv_sub_del_devices(struct bttv_core *core)
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{
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struct bttv_sub_device *sub, *save;
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list_for_each_entry_safe(sub, save, &core->subs, list) {
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list_del(&sub->list);
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device_unregister(&sub->dev);
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}
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return 0;
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}
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/* ----------------------------------------------------------------------- */
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/* external: sub-driver register/unregister */
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int bttv_sub_register(struct bttv_sub_driver *sub, char *wanted)
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{
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sub->drv.bus = &bttv_sub_bus_type;
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snprintf(sub->wanted,sizeof(sub->wanted),"%s",wanted);
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return driver_register(&sub->drv);
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}
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EXPORT_SYMBOL(bttv_sub_register);
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int bttv_sub_unregister(struct bttv_sub_driver *sub)
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{
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driver_unregister(&sub->drv);
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return 0;
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}
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EXPORT_SYMBOL(bttv_sub_unregister);
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/* ----------------------------------------------------------------------- */
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/* external: gpio access functions */
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void bttv_gpio_inout(struct bttv_core *core, u32 mask, u32 outbits)
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{
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struct bttv *btv = container_of(core, struct bttv, c);
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unsigned long flags;
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u32 data;
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spin_lock_irqsave(&btv->gpio_lock,flags);
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data = btread(BT848_GPIO_OUT_EN);
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data = data & ~mask;
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data = data | (mask & outbits);
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btwrite(data,BT848_GPIO_OUT_EN);
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spin_unlock_irqrestore(&btv->gpio_lock,flags);
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}
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u32 bttv_gpio_read(struct bttv_core *core)
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{
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struct bttv *btv = container_of(core, struct bttv, c);
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u32 value;
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value = btread(BT848_GPIO_DATA);
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return value;
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}
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void bttv_gpio_write(struct bttv_core *core, u32 value)
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{
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struct bttv *btv = container_of(core, struct bttv, c);
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btwrite(value,BT848_GPIO_DATA);
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}
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void bttv_gpio_bits(struct bttv_core *core, u32 mask, u32 bits)
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{
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struct bttv *btv = container_of(core, struct bttv, c);
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unsigned long flags;
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u32 data;
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spin_lock_irqsave(&btv->gpio_lock,flags);
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data = btread(BT848_GPIO_DATA);
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data = data & ~mask;
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data = data | (mask & bits);
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btwrite(data,BT848_GPIO_DATA);
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spin_unlock_irqrestore(&btv->gpio_lock,flags);
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}
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