--- /dev/null
+/*
+
+ 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>
+
+ 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.
+
+*/
+
+#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, struct device_driver *drv)
+{
+ 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 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;
+ 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);
+}
Code Review / kvmfornfv.git / blobdiff