1 files changed, 187 insertions, 0 deletions

diff --git a/drivers/media/video/bt8xx/bttv-gpio.c b/drivers/media/video/bt8xx/bttv-gpio.c
new file mode 100644
index 00000000000..13ce72c04b3
--- /dev/null
+++ b/drivers/media/video/bt8xx/bttv-gpio.c
@@ -0,0 +1,187 @@
+/*
+
+    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.
+
+*/
+
+#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) {
+                kfree(sub);
+                return err;
+        }
+        printk("bttv%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);
+}
+
+/*
+ * Local variables:
+ * c-basic-offset: 8
+ * End:
+ */