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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/media/pci/zoran/videocodec.c | |
parent | Initial commit. (diff) | |
download | linux-upstream.tar.xz linux-upstream.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/media/pci/zoran/videocodec.c')
-rw-r--r-- | drivers/media/pci/zoran/videocodec.c | 278 |
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; +} |