--- /dev/null
-
-static int proc_videocodecs_open(struct inode *inode, struct file *file)
-{
- return single_open(file, proc_videocodecs_show, NULL);
-}
-
-static const struct file_operations videocodecs_proc_fops = {
- .owner = THIS_MODULE,
- .open = proc_videocodecs_open,
- .read = seq_read,
- .llseek = seq_lseek,
- .release = single_release,
-};
+ /*
+ * VIDEO MOTION CODECs internal API for video devices
+ *
+ * Interface for MJPEG (and maybe later MPEG/WAVELETS) codec's
+ * bound to a master device.
+ *
+ * (c) 2002 Wolfgang Scherr <scherr@net4you.at>
+ *
+ * $Id: videocodec.c,v 1.1.2.8 2003/03/29 07:16:04 rbultje Exp $
+ *
+ * ------------------------------------------------------------------------
+ *
+ * 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.
+ *
+ * ------------------------------------------------------------------------
+ */
+
+ #define VIDEOCODEC_VERSION "v0.2"
+
+ #include <linux/kernel.h>
+ #include <linux/module.h>
+ #include <linux/init.h>
+ #include <linux/types.h>
+ #include <linux/slab.h>
+
+ // kernel config is here (procfs flag)
+
+ #ifdef CONFIG_PROC_FS
+ #include <linux/proc_fs.h>
+ #include <linux/seq_file.h>
+ #include <linux/uaccess.h>
+ #endif
+
+ #include "videocodec.h"
+
+ static int debug;
+ module_param(debug, int, 0);
+ MODULE_PARM_DESC(debug, "Debug level (0-4)");
+
+ #define dprintk(num, format, args...) \
+ do { \
+ if (debug >= num) \
+ printk(format, ##args); \
+ } while (0)
+
+ struct attached_list {
+ struct videocodec *codec;
+ struct attached_list *next;
+ };
+
+ struct codec_list {
+ const struct videocodec *codec;
+ int attached;
+ struct attached_list *list;
+ struct codec_list *next;
+ };
+
+ static struct codec_list *codeclist_top = NULL;
+
+ /* ================================================= */
+ /* function prototypes of the master/slave interface */
+ /* ================================================= */
+
+ struct videocodec *
+ videocodec_attach (struct videocodec_master *master)
+ {
+ struct codec_list *h = codeclist_top;
+ struct attached_list *a, *ptr;
+ struct videocodec *codec;
+ int res;
+
+ if (!master) {
+ dprintk(1, KERN_ERR "videocodec_attach: no data\n");
+ return NULL;
+ }
+
+ dprintk(2,
+ "videocodec_attach: '%s', flags %lx, magic %lx\n",
+ master->name, master->flags, master->magic);
+
+ if (!h) {
+ dprintk(1,
+ KERN_ERR
+ "videocodec_attach: no device available\n");
+ return NULL;
+ }
+
+ while (h) {
+ // attach only if the slave has at least the flags
+ // expected by the master
+ if ((master->flags & h->codec->flags) == master->flags) {
+ dprintk(4, "videocodec_attach: try '%s'\n",
+ h->codec->name);
+
+ if (!try_module_get(h->codec->owner))
+ return NULL;
+
+ codec = kmemdup(h->codec, sizeof(struct videocodec),
+ GFP_KERNEL);
+ if (!codec) {
+ dprintk(1,
+ KERN_ERR
+ "videocodec_attach: no mem\n");
+ goto out_module_put;
+ }
+
+ res = strlen(codec->name);
+ snprintf(codec->name + res, sizeof(codec->name) - res,
+ "[%d]", h->attached);
+ codec->master_data = master;
+ res = codec->setup(codec);
+ if (res == 0) {
+ dprintk(3, "videocodec_attach '%s'\n",
+ codec->name);
+ ptr = kzalloc(sizeof(struct attached_list), GFP_KERNEL);
+ if (!ptr) {
+ dprintk(1,
+ KERN_ERR
+ "videocodec_attach: no memory\n");
+ goto out_kfree;
+ }
+ ptr->codec = codec;
+
+ a = h->list;
+ if (!a) {
+ h->list = ptr;
+ dprintk(4,
+ "videocodec: first element\n");
+ } else {
+ while (a->next)
+ a = a->next; // find end
+ a->next = ptr;
+ dprintk(4,
+ "videocodec: in after '%s'\n",
+ h->codec->name);
+ }
+
+ h->attached += 1;
+ return codec;
+ } else {
+ kfree(codec);
+ }
+ }
+ h = h->next;
+ }
+
+ dprintk(1, KERN_ERR "videocodec_attach: no codec found!\n");
+ return NULL;
+
+ out_module_put:
+ module_put(h->codec->owner);
+ out_kfree:
+ kfree(codec);
+ return NULL;
+ }
+
+ int
+ videocodec_detach (struct videocodec *codec)
+ {
+ struct codec_list *h = codeclist_top;
+ struct attached_list *a, *prev;
+ int res;
+
+ if (!codec) {
+ dprintk(1, KERN_ERR "videocodec_detach: no data\n");
+ return -EINVAL;
+ }
+
+ dprintk(2,
+ "videocodec_detach: '%s', type: %x, flags %lx, magic %lx\n",
+ codec->name, codec->type, codec->flags, codec->magic);
+
+ if (!h) {
+ dprintk(1,
+ KERN_ERR "videocodec_detach: no device left...\n");
+ return -ENXIO;
+ }
+
+ while (h) {
+ a = h->list;
+ prev = NULL;
+ while (a) {
+ if (codec == a->codec) {
+ res = a->codec->unset(a->codec);
+ if (res >= 0) {
+ dprintk(3,
+ "videocodec_detach: '%s'\n",
+ a->codec->name);
+ a->codec->master_data = NULL;
+ } else {
+ dprintk(1,
+ KERN_ERR
+ "videocodec_detach: '%s'\n",
+ a->codec->name);
+ a->codec->master_data = NULL;
+ }
+ if (prev == NULL) {
+ h->list = a->next;
+ dprintk(4,
+ "videocodec: delete first\n");
+ } else {
+ prev->next = a->next;
+ dprintk(4,
+ "videocodec: delete middle\n");
+ }
+ module_put(a->codec->owner);
+ kfree(a->codec);
+ kfree(a);
+ h->attached -= 1;
+ return 0;
+ }
+ prev = a;
+ a = a->next;
+ }
+ h = h->next;
+ }
+
+ dprintk(1, KERN_ERR "videocodec_detach: given codec not found!\n");
+ return -EINVAL;
+ }
+
+ int
+ videocodec_register (const struct videocodec *codec)
+ {
+ struct codec_list *ptr, *h = codeclist_top;
+
+ if (!codec) {
+ dprintk(1, KERN_ERR "videocodec_register: no data!\n");
+ return -EINVAL;
+ }
+
+ dprintk(2,
+ "videocodec: register '%s', type: %x, flags %lx, magic %lx\n",
+ codec->name, codec->type, codec->flags, codec->magic);
+
+ ptr = kzalloc(sizeof(struct codec_list), GFP_KERNEL);
+ if (!ptr) {
+ dprintk(1, KERN_ERR "videocodec_register: no memory\n");
+ return -ENOMEM;
+ }
+ ptr->codec = codec;
+
+ if (!h) {
+ codeclist_top = ptr;
+ dprintk(4, "videocodec: hooked in as first element\n");
+ } else {
+ while (h->next)
+ h = h->next; // find the end
+ h->next = ptr;
+ dprintk(4, "videocodec: hooked in after '%s'\n",
+ h->codec->name);
+ }
+
+ return 0;
+ }
+
+ int
+ videocodec_unregister (const struct videocodec *codec)
+ {
+ struct codec_list *prev = NULL, *h = codeclist_top;
+
+ if (!codec) {
+ dprintk(1, KERN_ERR "videocodec_unregister: no data!\n");
+ return -EINVAL;
+ }
+
+ dprintk(2,
+ "videocodec: unregister '%s', type: %x, flags %lx, magic %lx\n",
+ codec->name, codec->type, codec->flags, codec->magic);
+
+ if (!h) {
+ dprintk(1,
+ KERN_ERR
+ "videocodec_unregister: no device left...\n");
+ return -ENXIO;
+ }
+
+ while (h) {
+ if (codec == h->codec) {
+ if (h->attached) {
+ dprintk(1,
+ KERN_ERR
+ "videocodec: '%s' is used\n",
+ h->codec->name);
+ return -EBUSY;
+ }
+ dprintk(3, "videocodec: unregister '%s' is ok.\n",
+ h->codec->name);
+ if (prev == NULL) {
+ codeclist_top = h->next;
+ dprintk(4,
+ "videocodec: delete first element\n");
+ } else {
+ prev->next = h->next;
+ dprintk(4,
+ "videocodec: delete middle element\n");
+ }
+ kfree(h);
+ return 0;
+ }
+ prev = h;
+ h = h->next;
+ }
+
+ dprintk(1,
+ KERN_ERR
+ "videocodec_unregister: given codec not found!\n");
+ return -EINVAL;
+ }
+
+ #ifdef CONFIG_PROC_FS
+ static int proc_videocodecs_show(struct seq_file *m, void *v)
+ {
+ struct codec_list *h = codeclist_top;
+ struct attached_list *a;
+
+ seq_printf(m, "<S>lave or attached <M>aster name type flags magic ");
+ seq_printf(m, "(connected as)\n");
+
+ while (h) {
+ seq_printf(m, "S %32s %04x %08lx %08lx (TEMPLATE)\n",
+ h->codec->name, h->codec->type,
+ h->codec->flags, h->codec->magic);
+ a = h->list;
+ while (a) {
+ seq_printf(m, "M %32s %04x %08lx %08lx (%s)\n",
+ a->codec->master_data->name,
+ a->codec->master_data->type,
+ a->codec->master_data->flags,
+ a->codec->master_data->magic,
+ a->codec->name);
+ a = a->next;
+ }
+ h = h->next;
+ }
+
+ return 0;
+ }
- videocodec_proc_entry = proc_create("videocodecs", 0, NULL, &videocodecs_proc_fops);
+ #endif
+
+ /* ===================== */
+ /* hook in driver module */
+ /* ===================== */
+ static int __init
+ videocodec_init (void)
+ {
+ #ifdef CONFIG_PROC_FS
+ static struct proc_dir_entry *videocodec_proc_entry;
+ #endif
+
+ printk(KERN_INFO "Linux video codec intermediate layer: %s\n",
+ VIDEOCODEC_VERSION);
+
+ #ifdef CONFIG_PROC_FS
++ videocodec_proc_entry = proc_create_single("videocodecs", 0, NULL,
++ proc_videocodecs_show);
+ if (!videocodec_proc_entry) {
+ dprintk(1, KERN_ERR "videocodec: can't init procfs.\n");
+ }
+ #endif
+ return 0;
+ }
+
+ static void __exit
+ videocodec_exit (void)
+ {
+ #ifdef CONFIG_PROC_FS
+ remove_proc_entry("videocodecs", NULL);
+ #endif
+ }
+
+ EXPORT_SYMBOL(videocodec_attach);
+ EXPORT_SYMBOL(videocodec_detach);
+ EXPORT_SYMBOL(videocodec_register);
+ EXPORT_SYMBOL(videocodec_unregister);
+
+ module_init(videocodec_init);
+ module_exit(videocodec_exit);
+
+ MODULE_AUTHOR("Wolfgang Scherr <scherr@net4you.at>");
+ MODULE_DESCRIPTION("Intermediate API module for video codecs "
+ VIDEOCODEC_VERSION);
+ MODULE_LICENSE("GPL");
projects / linux-2.6-microblaze.git / commitdiff