V4L/DVB (5862): V4L: Add internal ioctl-like interface.

This patch adds an internal ioctl-like interface which can be used in
situations where a single Video4Linux device is implemented by multiple
device drivers. One master device controls one or more slave devices.
The slaves provide Video4Linux ioctl-like interface for the use of the
master.

Only a handful of ioctls are implemented at the moment. More can (and
should) be added as more functionality is required.
Signed-off-by: Sakari Ailus <sakari.ailus@nokia.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/video/Makefile

@@ -11,7 +11,8 @@ tuner-$(CONFIG_TUNER_TEA5761)	+= tea5761.o
 
 msp3400-objs	:=	msp3400-driver.o msp3400-kthreads.o
 
-obj-$(CONFIG_VIDEO_DEV) += videodev.o v4l2-common.o compat_ioctl32.o
+obj-$(CONFIG_VIDEO_DEV) += videodev.o v4l2-common.o compat_ioctl32.o \
+			   v4l2-int-device.o
 
 ifeq ($(CONFIG_VIDEO_V4L1_COMPAT),y)
   obj-$(CONFIG_VIDEO_DEV) += v4l1-compat.o

drivers/media/video/v4l2-int-device.c

+/*
+ * drivers/media/video/v4l2-int-device.c
+ *
+ * V4L2 internal ioctl interface.
+ *
+ * Copyright (C) 2007 Nokia Corporation.
+ *
+ * Contact: Sakari Ailus <sakari.ailus@nokia.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * 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., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#include <linux/kernel.h>
+#include <linux/list.h>
+#include <linux/sort.h>
+#include <linux/string.h>
+
+#include <media/v4l2-int-device.h>
+
+static DEFINE_MUTEX(mutex);
+static LIST_HEAD(int_list);
+
+static void v4l2_int_device_try_attach_all(void)
+{
+	struct list_head *head_master;
+
+	list_for_each(head_master, &int_list) {
+		struct list_head *head_slave;
+		struct v4l2_int_device *m =
+			list_entry(head_master, struct v4l2_int_device, head);
+
+		if (m->type != v4l2_int_type_master)
+			continue;
+
+		list_for_each(head_slave, &int_list) {
+			struct v4l2_int_device *s =
+				list_entry(head_slave,
+					   struct v4l2_int_device, head);
+
+			if (s->type != v4l2_int_type_slave)
+				continue;
+
+			/* Slave is connected? */
+			if (s->u.slave->master)
+				continue;
+
+			/* Slave wants to attach to master? */
+			if (s->u.slave->attach_to[0] != 0
+			    && strncmp(m->name, s->u.slave->attach_to,
+				       V4L2NAMESIZE))
+				continue;
+
+			if (!try_module_get(m->module))
+				continue;
+
+			if (m->u.master->attach(m, s)) {
+				module_put(m->module);
+				continue;
+			}
+
+			s->u.slave->master = m;
+		}
+	}
+}
+
+static int ioctl_sort_cmp(const void *a, const void *b)
+{
+	const struct v4l2_int_ioctl_desc *d1 = a, *d2 = b;
+
+	if (d1->num > d2->num)
+		return 1;
+
+	if (d1->num < d2->num)
+		return -1;
+
+	return 0;
+}
+
+int v4l2_int_device_register(struct v4l2_int_device *d)
+{
+	if (d->type == v4l2_int_type_slave)
+		sort(d->u.slave->ioctls, d->u.slave->num_ioctls,
+		     sizeof(struct v4l2_int_ioctl_desc),
+		     &ioctl_sort_cmp, NULL);
+	mutex_lock(&mutex);
+	list_add(&d->head, &int_list);
+	v4l2_int_device_try_attach_all();
+	mutex_unlock(&mutex);
+
+	return 0;
+}
+
+void v4l2_int_device_unregister(struct v4l2_int_device *d)
+{
+	mutex_lock(&mutex);
+	list_del(&d->head);
+	if (d->type == v4l2_int_type_slave
+	    && d->u.slave->master != NULL) {
+		d->u.slave->master->u.master->detach(d);
+		module_put(d->u.slave->master->module);
+		d->u.slave->master = NULL;
+	}
+	mutex_unlock(&mutex);
+}
+
+static int no_such_ioctl(struct v4l2_int_device *d)
+{
+	return -EINVAL;
+}
+
+/* Adapted from search_extable in extable.c. */
+static v4l2_int_ioctl_func *find_ioctl(struct v4l2_int_slave *slave, int cmd)
+{
+	const struct v4l2_int_ioctl_desc *first = slave->ioctls;
+	const struct v4l2_int_ioctl_desc *last =
+		first + slave->num_ioctls - 1;
+
+	while (first <= last) {
+		const struct v4l2_int_ioctl_desc *mid;
+
+		mid = (last - first) / 2 + first;
+
+		if (mid->num < cmd)
+			first = mid + 1;
+		else if (mid->num > cmd)
+			last = mid - 1;
+		else
+			return mid->func;
+	}
+
+	return &no_such_ioctl;
+}
+
+int v4l2_int_ioctl_0(struct v4l2_int_device *d, int cmd)
+{
+	return ((v4l2_int_ioctl_func_0 *)find_ioctl(d->u.slave, cmd))(d);
+}
+
+int v4l2_int_ioctl_1(struct v4l2_int_device *d, int cmd, void *arg)
+{
+	return ((v4l2_int_ioctl_func_1 *)find_ioctl(d->u.slave, cmd))(d, arg);
+}

include/media/v4l2-int-device.h

+/*
+ * include/media/v4l2-int-device.h
+ *
+ * V4L2 internal ioctl interface.
+ *
+ * Copyright (C) 2007 Nokia Corporation.
+ *
+ * Contact: Sakari Ailus <sakari.ailus@nokia.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * version 2 as published by the Free Software Foundation.
+ *
+ * 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., 51 Franklin St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#ifndef V4L2_INT_DEVICE_H
+#define V4L2_INT_DEVICE_H
+
+#include <linux/module.h>
+#include <media/v4l2-common.h>
+
+#define V4L2NAMESIZE 32
+
+enum v4l2_int_type {
+	v4l2_int_type_master = 1,
+	v4l2_int_type_slave
+};
+
+enum v4l2_int_ioctl_num {
+	/*
+	 *
+	 * "Proper" V4L ioctls, as in struct video_device.
+	 *
+	 */
+	vidioc_int_enum_fmt_cap_num = 1,
+	vidioc_int_g_fmt_cap_num,
+	vidioc_int_s_fmt_cap_num,
+	vidioc_int_try_fmt_cap_num,
+	vidioc_int_queryctrl_num,
+	vidioc_int_g_ctrl_num,
+	vidioc_int_s_ctrl_num,
+	vidioc_int_g_parm_num,
+	vidioc_int_s_parm_num,
+
+	/*
+	 *
+	 * Strictly internal ioctls.
+	 *
+	 */
+	/* Initialise the device when slave attaches to the master. */
+	vidioc_int_dev_init_num = 1000,
+	/* Delinitialise the device at slave detach. */
+	vidioc_int_dev_exit_num,
+	/* Set device power state: 0 is off, non-zero is on. */
+	vidioc_int_s_power_num,
+	/* Get parallel interface clock speed for current settings. */
+	vidioc_int_g_ext_clk_num,
+	/*
+	 * Tell what the parallel interface clock speed actually is.
+	 */
+	vidioc_int_s_ext_clk_num,
+	/* Does the slave need to be reset after VIDIOC_DQBUF? */
+	vidioc_int_g_needs_reset_num,
+
+	/*
+	 *
+	 * VIDIOC_INT_* ioctls.
+	 *
+	 */
+	/* VIDIOC_INT_RESET */
+	vidioc_int_reset_num,
+	/* VIDIOC_INT_INIT */
+	vidioc_int_init_num,
+	/* VIDIOC_INT_G_CHIP_IDENT */
+	vidioc_int_g_chip_ident_num,
+
+	/*
+	 *
+	 * Start of private ioctls.
+	 *
+	 */
+	vidioc_int_priv_start_num = 2000,
+};
+
+struct v4l2_int_device;
+
+struct v4l2_int_master {
+	int (*attach)(struct v4l2_int_device *master,
+		      struct v4l2_int_device *slave);
+	void (*detach)(struct v4l2_int_device *master);
+};
+
+typedef int (v4l2_int_ioctl_func)(struct v4l2_int_device *);
+typedef int (v4l2_int_ioctl_func_0)(struct v4l2_int_device *);
+typedef int (v4l2_int_ioctl_func_1)(struct v4l2_int_device *, void *);
+
+struct v4l2_int_ioctl_desc {
+	int num;
+	v4l2_int_ioctl_func *func;
+};
+
+struct v4l2_int_slave {
+	/* Don't touch master. */
+	struct v4l2_int_device *master;
+
+	char attach_to[V4L2NAMESIZE];
+
+	int num_ioctls;
+	struct v4l2_int_ioctl_desc *ioctls;
+};
+
+struct v4l2_int_device {
+	/* Don't touch head. */
+	struct list_head head;
+
+	struct module *module;
+
+	char name[V4L2NAMESIZE];
+
+	enum v4l2_int_type type;
+	union {
+		struct v4l2_int_master *master;
+		struct v4l2_int_slave *slave;
+	} u;
+
+	void *priv;
+};
+
+int v4l2_int_device_register(struct v4l2_int_device *d);
+void v4l2_int_device_unregister(struct v4l2_int_device *d);
+
+int v4l2_int_ioctl_0(struct v4l2_int_device *d, int cmd);
+int v4l2_int_ioctl_1(struct v4l2_int_device *d, int cmd, void *arg);
+
+/*
+ *
+ * IOCTL wrapper functions for better type checking.
+ *
+ */
+
+#define V4L2_INT_WRAPPER_0(name)					\
+	static inline int vidioc_int_##name(struct v4l2_int_device *d)	\
+	{								\
+		return v4l2_int_ioctl_0(d, vidioc_int_##name##_num);	\
+	}								\
+									\
+	static inline struct v4l2_int_ioctl_desc			\
+	vidioc_int_##name##_cb(int (*func)				\
+			       (struct v4l2_int_device *))		\
+	{								\
+		struct v4l2_int_ioctl_desc desc;			\
+									\
+		desc.num = vidioc_int_##name##_num;			\
+		desc.func = (v4l2_int_ioctl_func *)func;		\
+									\
+		return desc;						\
+	}
+
+#define V4L2_INT_WRAPPER_1(name, arg_type, asterisk)			\
+	static inline int vidioc_int_##name(struct v4l2_int_device *d,	\
+					    arg_type asterisk arg)	\
+	{								\
+		return v4l2_int_ioctl_1(d, vidioc_int_##name##_num,	\
+					(void *)arg);			\
+	}								\
+									\
+	static inline struct v4l2_int_ioctl_desc			\
+	vidioc_int_##name##_cb(int (*func)				\
+			       (struct v4l2_int_device *,		\
+				arg_type asterisk))			\
+	{								\
+		struct v4l2_int_ioctl_desc desc;			\
+									\
+		desc.num = vidioc_int_##name##_num;			\
+		desc.func = (v4l2_int_ioctl_func *)func;		\
+									\
+		return desc;						\
+	}
+
+V4L2_INT_WRAPPER_1(enum_fmt_cap, struct v4l2_fmtdesc, *);
+V4L2_INT_WRAPPER_1(g_fmt_cap, struct v4l2_format, *);
+V4L2_INT_WRAPPER_1(s_fmt_cap, struct v4l2_format, *);
+V4L2_INT_WRAPPER_1(try_fmt_cap, struct v4l2_format, *);
+V4L2_INT_WRAPPER_1(queryctrl, struct v4l2_queryctrl, *);
+V4L2_INT_WRAPPER_1(g_ctrl, struct v4l2_control, *);
+V4L2_INT_WRAPPER_1(s_ctrl, struct v4l2_control, *);
+V4L2_INT_WRAPPER_1(g_parm, struct v4l2_streamparm, *);
+V4L2_INT_WRAPPER_1(s_parm, struct v4l2_streamparm, *);
+
+V4L2_INT_WRAPPER_0(dev_init);
+V4L2_INT_WRAPPER_0(dev_exit);
+V4L2_INT_WRAPPER_1(s_power, int, );
+V4L2_INT_WRAPPER_1(s_ext_clk, u32, );
+V4L2_INT_WRAPPER_1(g_ext_clk, u32, *);
+V4L2_INT_WRAPPER_1(g_needs_reset, void, *);
+
+V4L2_INT_WRAPPER_0(reset);
+V4L2_INT_WRAPPER_0(init);
+V4L2_INT_WRAPPER_1(g_chip_ident, int, *);
+
+#endif