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V4L: Add internal ioctl interface.
Signed-off-by: Sakari Ailus <sakari.ailus@nokia.com>
---
drivers/media/video/v4l2-int-device.c | 137 ++++++++++++++++++++++++++++++
include/media/v4l2-int-device.h | 150 +++++++++++++++++++++++++++++++++
2 files changed, 287 insertions(+), 0 deletions(-)
create mode 100644 drivers/media/video/v4l2-int-device.c
create mode 100644 include/media/v4l2-int-device.h
diff --git a/drivers/media/video/v4l2-int-device.c b/drivers/media/video/v4l2-int-device.c
new file mode 100644
index 0000000..5e17eea
--- /dev/null
+++ b/drivers/media/video/v4l2-int-device.c
@@ -0,0 +1,137 @@
+/*
+ * 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);
+}
+
+/* Adapted from search_extable in extable.c. */
+int v4l2_int_ioctl(struct v4l2_int_device *d, int cmd, void *arg)
+{
+ const struct v4l2_int_ioctl_desc *first = d->u.slave->ioctls;
+ const struct v4l2_int_ioctl_desc *last =
+ first + d->u.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(d, arg);
+ }
+ return -EINVAL;
+}
diff --git a/include/media/v4l2-int-device.h b/include/media/v4l2-int-device.h
new file mode 100644
index 0000000..5bec692
--- /dev/null
+++ b/include/media/v4l2-int-device.h
@@ -0,0 +1,150 @@
+/*
+ * 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_DEVICE_REG_H
+#define V4L2_DEVICE_REG_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 {
+ vidioc_int_dev_init_num = 1,
+ vidioc_int_dev_exit_num,
+ vidioc_int_s_power_num,
+ vidioc_int_g_ext_clk_num,
+ vidioc_int_s_ext_clk_num,
+ vidioc_int_g_needs_reset_num,
+ vidioc_int_g_chip_ident_num,
+ vidioc_int_reset_num,
+ vidioc_int_init_num,
+ vidioc_int_enum_fmt_cap_num,
+ vidioc_int_s_fmt_cap_num,
+ vidioc_int_g_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,
+};
+
+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 *, 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(struct v4l2_int_device *d, int cmd, void *arg);
+
+/*
+ *
+ * IOCTL wrapper functions for better type checking.
+ *
+ */
+
+#define DECLARE_V4L2_INT_IOCTL_WRAPPER_REF(name, arg_type) \
+ static inline int vidioc_int_##name(struct v4l2_int_device *d, \
+ arg_type *arg) \
+ { \
+ return v4l2_int_ioctl(d, vidioc_int_##name##_num, arg); \
+ }
+
+#define DECLARE_V4L2_INT_IOCTL_WRAPPER_VALUE(name, arg_type) \
+ static inline int vidioc_int_##name(struct v4l2_int_device *d, \
+ arg_type arg) \
+ { \
+ return v4l2_int_ioctl(d, vidioc_int_##name##_num, &arg); \
+ }
+
+#define DECLARE_V4L2_INT_IOCTL_WRAPPER_VOID(name) \
+ static inline int vidioc_int_##name(struct v4l2_int_device *d) \
+ { \
+ return v4l2_int_ioctl(d, vidioc_int_##name##_num, NULL); \
+ }
+
+DECLARE_V4L2_INT_IOCTL_WRAPPER_VOID(dev_init);
+DECLARE_V4L2_INT_IOCTL_WRAPPER_VOID(dev_exit);
+DECLARE_V4L2_INT_IOCTL_WRAPPER_VALUE(s_power, int);
+DECLARE_V4L2_INT_IOCTL_WRAPPER_VALUE(s_ext_clk, u32);
+DECLARE_V4L2_INT_IOCTL_WRAPPER_REF(g_ext_clk, u32);
+DECLARE_V4L2_INT_IOCTL_WRAPPER_REF(g_needs_reset, void);
+DECLARE_V4L2_INT_IOCTL_WRAPPER_VOID(reset);
+DECLARE_V4L2_INT_IOCTL_WRAPPER_VOID(init);
+DECLARE_V4L2_INT_IOCTL_WRAPPER_REF(enum_fmt_cap, struct v4l2_fmtdesc);
+DECLARE_V4L2_INT_IOCTL_WRAPPER_REF(try_fmt_cap, struct v4l2_format);
+DECLARE_V4L2_INT_IOCTL_WRAPPER_REF(s_fmt_cap, struct v4l2_format);
+DECLARE_V4L2_INT_IOCTL_WRAPPER_REF(g_fmt_cap, struct v4l2_format);
+DECLARE_V4L2_INT_IOCTL_WRAPPER_REF(g_parm, struct v4l2_streamparm);
+DECLARE_V4L2_INT_IOCTL_WRAPPER_REF(s_parm, struct v4l2_streamparm);
+DECLARE_V4L2_INT_IOCTL_WRAPPER_REF(queryctrl, struct v4l2_queryctrl);
+DECLARE_V4L2_INT_IOCTL_WRAPPER_REF(g_ctrl, struct v4l2_control);
+DECLARE_V4L2_INT_IOCTL_WRAPPER_REF(s_ctrl, struct v4l2_control);
+
+#endif
--
1.5.0.6
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