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path: root/drivers/media/pci/zoran/videocodec.c
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Diffstat (limited to 'drivers/media/pci/zoran/videocodec.c')
-rw-r--r--drivers/media/pci/zoran/videocodec.c278
1 files changed, 278 insertions, 0 deletions
diff --git a/drivers/media/pci/zoran/videocodec.c b/drivers/media/pci/zoran/videocodec.c
new file mode 100644
index 000000000..8efc5e06b
--- /dev/null
+++ b/drivers/media/pci/zoran/videocodec.c
@@ -0,0 +1,278 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * 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>
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/slab.h>
+
+#include "videocodec.h"
+
+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;
+
+/* ================================================= */
+/* function prototypes of the master/slave interface */
+/* ================================================= */
+
+struct videocodec *videocodec_attach(struct videocodec_master *master)
+{
+ struct codec_list *h = codeclist_top;
+ struct zoran *zr;
+ struct attached_list *a, *ptr;
+ struct videocodec *codec;
+ int res;
+
+ if (!master) {
+ pr_err("%s: no data\n", __func__);
+ return NULL;
+ }
+
+ zr = videocodec_master_to_zoran(master);
+
+ zrdev_dbg(zr, "%s: '%s', flags %lx, magic %lx\n", __func__,
+ master->name, master->flags, master->magic);
+
+ if (!h) {
+ zrdev_err(zr, "%s: no device available\n", __func__);
+ 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) {
+ zrdev_dbg(zr, "%s: try '%s'\n", __func__, h->codec->name);
+
+ codec = kmemdup(h->codec, sizeof(struct videocodec), GFP_KERNEL);
+ if (!codec)
+ goto out_kfree;
+
+ 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) {
+ zrdev_dbg(zr, "%s: '%s'\n", __func__, codec->name);
+ ptr = kzalloc(sizeof(*ptr), GFP_KERNEL);
+ if (!ptr)
+ goto out_kfree;
+ ptr->codec = codec;
+
+ a = h->list;
+ if (!a) {
+ h->list = ptr;
+ zrdev_dbg(zr, "videocodec: first element\n");
+ } else {
+ while (a->next)
+ a = a->next; // find end
+ a->next = ptr;
+ zrdev_dbg(zr, "videocodec: in after '%s'\n",
+ h->codec->name);
+ }
+
+ h->attached += 1;
+ return codec;
+ }
+ kfree(codec);
+ }
+ h = h->next;
+ }
+
+ zrdev_err(zr, "%s: no codec found!\n", __func__);
+ return NULL;
+
+ out_kfree:
+ kfree(codec);
+ return NULL;
+}
+
+int videocodec_detach(struct videocodec *codec)
+{
+ struct codec_list *h = codeclist_top;
+ struct zoran *zr;
+ struct attached_list *a, *prev;
+ int res;
+
+ if (!codec) {
+ pr_err("%s: no data\n", __func__);
+ return -EINVAL;
+ }
+
+ zr = videocodec_to_zoran(codec);
+
+ zrdev_dbg(zr, "%s: '%s', type: %x, flags %lx, magic %lx\n", __func__,
+ codec->name, codec->type, codec->flags, codec->magic);
+
+ if (!h) {
+ zrdev_err(zr, "%s: no device left...\n", __func__);
+ return -ENXIO;
+ }
+
+ while (h) {
+ a = h->list;
+ prev = NULL;
+ while (a) {
+ if (codec == a->codec) {
+ res = a->codec->unset(a->codec);
+ if (res >= 0) {
+ zrdev_dbg(zr, "%s: '%s'\n", __func__,
+ a->codec->name);
+ a->codec->master_data = NULL;
+ } else {
+ zrdev_err(zr, "%s: '%s'\n", __func__, a->codec->name);
+ a->codec->master_data = NULL;
+ }
+ if (!prev) {
+ h->list = a->next;
+ zrdev_dbg(zr, "videocodec: delete first\n");
+ } else {
+ prev->next = a->next;
+ zrdev_dbg(zr, "videocodec: delete middle\n");
+ }
+ kfree(a->codec);
+ kfree(a);
+ h->attached -= 1;
+ return 0;
+ }
+ prev = a;
+ a = a->next;
+ }
+ h = h->next;
+ }
+
+ zrdev_err(zr, "%s: given codec not found!\n", __func__);
+ return -EINVAL;
+}
+
+int videocodec_register(const struct videocodec *codec)
+{
+ struct codec_list *ptr, *h = codeclist_top;
+ struct zoran *zr;
+
+ if (!codec) {
+ pr_err("%s: no data!\n", __func__);
+ return -EINVAL;
+ }
+
+ zr = videocodec_to_zoran((struct videocodec *)codec);
+
+ zrdev_dbg(zr,
+ "videocodec: register '%s', type: %x, flags %lx, magic %lx\n",
+ codec->name, codec->type, codec->flags, codec->magic);
+
+ ptr = kzalloc(sizeof(*ptr), GFP_KERNEL);
+ if (!ptr)
+ return -ENOMEM;
+ ptr->codec = codec;
+
+ if (!h) {
+ codeclist_top = ptr;
+ zrdev_dbg(zr, "videocodec: hooked in as first element\n");
+ } else {
+ while (h->next)
+ h = h->next; // find the end
+ h->next = ptr;
+ zrdev_dbg(zr, "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;
+ struct zoran *zr;
+
+ if (!codec) {
+ pr_err("%s: no data!\n", __func__);
+ return -EINVAL;
+ }
+
+ zr = videocodec_to_zoran((struct videocodec *)codec);
+
+ zrdev_dbg(zr,
+ "videocodec: unregister '%s', type: %x, flags %lx, magic %lx\n",
+ codec->name, codec->type, codec->flags, codec->magic);
+
+ if (!h) {
+ zrdev_err(zr, "%s: no device left...\n", __func__);
+ return -ENXIO;
+ }
+
+ while (h) {
+ if (codec == h->codec) {
+ if (h->attached) {
+ zrdev_err(zr, "videocodec: '%s' is used\n",
+ h->codec->name);
+ return -EBUSY;
+ }
+ zrdev_dbg(zr, "videocodec: unregister '%s' is ok.\n",
+ h->codec->name);
+ if (!prev) {
+ codeclist_top = h->next;
+ zrdev_dbg(zr,
+ "videocodec: delete first element\n");
+ } else {
+ prev->next = h->next;
+ zrdev_dbg(zr,
+ "videocodec: delete middle element\n");
+ }
+ kfree(h);
+ return 0;
+ }
+ prev = h;
+ h = h->next;
+ }
+
+ zrdev_err(zr, "%s: given codec not found!\n", __func__);
+ return -EINVAL;
+}
+
+int videocodec_debugfs_show(struct seq_file *m)
+{
+ struct codec_list *h = codeclist_top;
+ struct attached_list *a;
+
+ seq_puts(m, "<S>lave or attached <M>aster name type flags magic ");
+ seq_puts(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;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-21 14:53:05 +0000