usb: gadget: f_fs: Add flags to descriptors block
This reworks the way SuperSpeed descriptors are added and instead of having a magic after full and high speed descriptors, it reworks the whole descriptors block to include a flags field which lists which descriptors are present and makes future extensions possible. Signed-off-by: Michal Nazarewicz <mina86@mina86.com> Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Michal Nazarewicz
Felipe Balbi
parent
8d4e897bd0
commit
ac8dde11f2
3 changed files with 97 additions and 108 deletions
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@ -1434,7 +1434,7 @@ static void ffs_data_clear(struct ffs_data *ffs)
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if (ffs->epfiles)
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ffs_epfiles_destroy(ffs->epfiles, ffs->eps_count);
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kfree(ffs->raw_descs);
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kfree(ffs->raw_descs_data);
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kfree(ffs->raw_strings);
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kfree(ffs->stringtabs);
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}
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@ -1446,12 +1446,12 @@ static void ffs_data_reset(struct ffs_data *ffs)
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ffs_data_clear(ffs);
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ffs->epfiles = NULL;
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ffs->raw_descs_data = NULL;
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ffs->raw_descs = NULL;
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ffs->raw_strings = NULL;
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ffs->stringtabs = NULL;
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ffs->raw_fs_hs_descs_length = 0;
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ffs->raw_ss_descs_length = 0;
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ffs->raw_descs_length = 0;
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ffs->fs_descs_count = 0;
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ffs->hs_descs_count = 0;
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ffs->ss_descs_count = 0;
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@ -1865,89 +1865,76 @@ static int __ffs_data_do_entity(enum ffs_entity_type type,
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static int __ffs_data_got_descs(struct ffs_data *ffs,
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char *const _data, size_t len)
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{
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unsigned fs_count, hs_count, ss_count = 0;
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int fs_len, hs_len, ss_len, ret = -EINVAL;
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char *data = _data;
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char *data = _data, *raw_descs;
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unsigned counts[3], flags;
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int ret = -EINVAL, i;
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ENTER();
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if (unlikely(get_unaligned_le32(data) != FUNCTIONFS_DESCRIPTORS_MAGIC ||
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get_unaligned_le32(data + 4) != len))
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if (get_unaligned_le32(data + 4) != len)
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goto error;
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fs_count = get_unaligned_le32(data + 8);
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hs_count = get_unaligned_le32(data + 12);
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data += 16;
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len -= 16;
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if (likely(fs_count)) {
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fs_len = ffs_do_descs(fs_count, data, len,
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__ffs_data_do_entity, ffs);
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if (unlikely(fs_len < 0)) {
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ret = fs_len;
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goto error;
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}
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data += fs_len;
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len -= fs_len;
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} else {
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fs_len = 0;
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}
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if (likely(hs_count)) {
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hs_len = ffs_do_descs(hs_count, data, len,
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__ffs_data_do_entity, ffs);
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if (unlikely(hs_len < 0)) {
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ret = hs_len;
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goto error;
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}
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data += hs_len;
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len -= hs_len;
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} else {
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hs_len = 0;
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}
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if (len >= 8) {
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/* Check SS_MAGIC for presence of ss_descs and get SS_COUNT */
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if (get_unaligned_le32(data) != FUNCTIONFS_SS_DESC_MAGIC)
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goto einval;
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ss_count = get_unaligned_le32(data + 4);
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switch (get_unaligned_le32(data)) {
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case FUNCTIONFS_DESCRIPTORS_MAGIC:
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flags = FUNCTIONFS_HAS_FS_DESC | FUNCTIONFS_HAS_HS_DESC;
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data += 8;
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len -= 8;
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}
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if (!fs_count && !hs_count && !ss_count)
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goto einval;
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if (ss_count) {
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ss_len = ffs_do_descs(ss_count, data, len,
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__ffs_data_do_entity, ffs);
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if (unlikely(ss_len < 0)) {
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ret = ss_len;
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break;
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case FUNCTIONFS_DESCRIPTORS_MAGIC_V2:
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flags = get_unaligned_le32(data + 8);
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if (flags & ~(FUNCTIONFS_HAS_FS_DESC |
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FUNCTIONFS_HAS_HS_DESC |
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FUNCTIONFS_HAS_SS_DESC)) {
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ret = -ENOSYS;
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goto error;
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}
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ret = ss_len;
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} else {
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ss_len = 0;
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ret = 0;
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data += 12;
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len -= 12;
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break;
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default:
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goto error;
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}
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if (unlikely(len != ret))
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goto einval;
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/* Read fs_count, hs_count and ss_count (if present) */
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for (i = 0; i < 3; ++i) {
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if (!(flags & (1 << i))) {
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counts[i] = 0;
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} else if (len < 4) {
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goto error;
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} else {
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counts[i] = get_unaligned_le32(data);
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data += 4;
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len -= 4;
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}
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}
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ffs->raw_fs_hs_descs_length = fs_len + hs_len;
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ffs->raw_ss_descs_length = ss_len;
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ffs->raw_descs = _data;
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ffs->fs_descs_count = fs_count;
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ffs->hs_descs_count = hs_count;
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ffs->ss_descs_count = ss_count;
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/* Read descriptors */
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raw_descs = data;
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for (i = 0; i < 3; ++i) {
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if (!counts[i])
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continue;
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ret = ffs_do_descs(counts[i], data, len,
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__ffs_data_do_entity, ffs);
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if (ret < 0)
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goto error;
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data += ret;
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len -= ret;
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}
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if (raw_descs == data || len) {
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ret = -EINVAL;
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goto error;
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}
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ffs->raw_descs_data = _data;
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ffs->raw_descs = raw_descs;
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ffs->raw_descs_length = data - raw_descs;
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ffs->fs_descs_count = counts[0];
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ffs->hs_descs_count = counts[1];
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ffs->ss_descs_count = counts[2];
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return 0;
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einval:
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ret = -EINVAL;
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error:
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kfree(_data);
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return ret;
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@ -2359,8 +2346,7 @@ static int _ffs_func_bind(struct usb_configuration *c,
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vla_item_with_sz(d, struct usb_descriptor_header *, ss_descs,
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super ? ffs->ss_descs_count + 1 : 0);
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vla_item_with_sz(d, short, inums, ffs->interfaces_count);
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vla_item_with_sz(d, char, raw_descs,
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ffs->raw_fs_hs_descs_length + ffs->raw_ss_descs_length);
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vla_item_with_sz(d, char, raw_descs, ffs->raw_descs_length);
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char *vlabuf;
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ENTER();
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@ -2376,15 +2362,9 @@ static int _ffs_func_bind(struct usb_configuration *c,
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/* Zero */
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memset(vla_ptr(vlabuf, d, eps), 0, d_eps__sz);
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/* Copy only raw (hs,fs) descriptors (until ss_magic and ss_count) */
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memcpy(vla_ptr(vlabuf, d, raw_descs), ffs->raw_descs + 16,
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ffs->raw_fs_hs_descs_length);
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/* Copy SS descs present @ header + hs_fs_descs + ss_magic + ss_count */
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if (func->ffs->ss_descs_count)
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memcpy(vla_ptr(vlabuf, d, raw_descs) +
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ffs->raw_fs_hs_descs_length,
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ffs->raw_descs + 16 + ffs->raw_fs_hs_descs_length + 8,
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ffs->raw_ss_descs_length);
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/* Copy descriptors */
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memcpy(vla_ptr(vlabuf, d, raw_descs), ffs->raw_descs,
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ffs->raw_descs_length);
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memset(vla_ptr(vlabuf, d, inums), 0xff, d_inums__sz);
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for (ret = ffs->eps_count; ret; --ret) {
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@ -206,15 +206,13 @@ struct ffs_data {
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/* filled by __ffs_data_got_descs() */
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/*
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* Real descriptors are 16 bytes after raw_descs (so you need
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* to skip 16 bytes (ie. ffs->raw_descs + 16) to get to the
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* first full speed descriptor).
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* raw_fs_hs_descs_length does not have those 16 bytes added.
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* ss_descs are 8 bytes (ss_magic + count) pass the hs_descs
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* raw_descs is what you kfree, real_descs points inside of raw_descs,
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* where full speed, high speed and super speed descriptors start.
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* real_descs_length is the length of all those descriptors.
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*/
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const void *raw_descs_data;
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const void *raw_descs;
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unsigned raw_fs_hs_descs_length;
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unsigned raw_ss_descs_length;
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unsigned raw_descs_length;
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unsigned fs_descs_count;
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unsigned hs_descs_count;
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unsigned ss_descs_count;
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@ -10,10 +10,15 @@
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enum {
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FUNCTIONFS_DESCRIPTORS_MAGIC = 1,
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FUNCTIONFS_STRINGS_MAGIC = 2
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FUNCTIONFS_STRINGS_MAGIC = 2,
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FUNCTIONFS_DESCRIPTORS_MAGIC_V2 = 3,
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};
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#define FUNCTIONFS_SS_DESC_MAGIC 0x0055DE5C
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enum functionfs_flags {
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FUNCTIONFS_HAS_FS_DESC = 1,
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FUNCTIONFS_HAS_HS_DESC = 2,
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FUNCTIONFS_HAS_SS_DESC = 4,
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};
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#ifndef __KERNEL__
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@ -29,34 +34,40 @@ struct usb_endpoint_descriptor_no_audio {
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} __attribute__((packed));
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/*
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* All numbers must be in little endian order.
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*/
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struct usb_functionfs_descs_head {
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__le32 magic;
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__le32 length;
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__le32 fs_count;
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__le32 hs_count;
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} __attribute__((packed));
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/*
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* Descriptors format:
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*
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* | off | name | type | description |
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* |-----+-----------+--------------+--------------------------------------|
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* | 0 | magic | LE32 | FUNCTIONFS_{FS,HS}_DESCRIPTORS_MAGIC |
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* | 0 | magic | LE32 | FUNCTIONFS_DESCRIPTORS_MAGIC_V2 |
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* | 4 | length | LE32 | length of the whole data chunk |
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* | 8 | flags | LE32 | combination of functionfs_flags |
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* | | fs_count | LE32 | number of full-speed descriptors |
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* | | hs_count | LE32 | number of high-speed descriptors |
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* | | ss_count | LE32 | number of super-speed descriptors |
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* | | fs_descrs | Descriptor[] | list of full-speed descriptors |
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* | | hs_descrs | Descriptor[] | list of high-speed descriptors |
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* | | ss_descrs | Descriptor[] | list of super-speed descriptors |
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*
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* Depending on which flags are set, various fields may be missing in the
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* structure. Any flags that are not recognised cause the whole block to be
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* rejected with -ENOSYS.
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*
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* Legacy descriptors format:
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*
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* | off | name | type | description |
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* |-----+-----------+--------------+--------------------------------------|
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* | 0 | magic | LE32 | FUNCTIONFS_DESCRIPTORS_MAGIC |
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* | 4 | length | LE32 | length of the whole data chunk |
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* | 8 | fs_count | LE32 | number of full-speed descriptors |
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* | 12 | hs_count | LE32 | number of high-speed descriptors |
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* | 16 | fs_descrs | Descriptor[] | list of full-speed descriptors |
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* | | hs_descrs | Descriptor[] | list of high-speed descriptors |
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* | | ss_magic | LE32 | FUNCTIONFS_SS_DESC_MAGIC |
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* | | ss_count | LE32 | number of super-speed descriptors |
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* | | ss_descrs | Descriptor[] | list of super-speed descriptors |
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*
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* ss_magic: if present then it implies that SS_DESCs are also present
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* descs are just valid USB descriptors and have the following format:
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* All numbers must be in little endian order.
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*
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* Descriptor[] is an array of valid USB descriptors which have the following
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* format:
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*
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* | off | name | type | description |
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* |-----+-----------------+------+--------------------------|
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