diff options
Diffstat (limited to 'drivers/hid/hid-core.c')
-rw-r--r-- | drivers/hid/hid-core.c | 96 |
1 files changed, 81 insertions, 15 deletions
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c index 70597854397f..b4b9d8152536 100644 --- a/drivers/hid/hid-core.c +++ b/drivers/hid/hid-core.c @@ -197,16 +197,37 @@ static unsigned hid_lookup_collection(struct hid_parser *parser, unsigned type) } /* + * Concatenate usage which defines 16 bits or less with the + * currently defined usage page to form a 32 bit usage + */ + +static void complete_usage(struct hid_parser *parser, unsigned int index) +{ + parser->local.usage[index] &= 0xFFFF; + parser->local.usage[index] |= + (parser->global.usage_page & 0xFFFF) << 16; +} + +/* * Add a usage to the temporary parser table. */ -static int hid_add_usage(struct hid_parser *parser, unsigned usage) +static int hid_add_usage(struct hid_parser *parser, unsigned usage, u8 size) { if (parser->local.usage_index >= HID_MAX_USAGES) { hid_err(parser->device, "usage index exceeded\n"); return -1; } parser->local.usage[parser->local.usage_index] = usage; + + /* + * If Usage item only includes usage id, concatenate it with + * currently defined usage page + */ + if (size <= 2) + complete_usage(parser, parser->local.usage_index); + + parser->local.usage_size[parser->local.usage_index] = size; parser->local.collection_index[parser->local.usage_index] = parser->collection_stack_ptr ? parser->collection_stack[parser->collection_stack_ptr - 1] : 0; @@ -248,6 +269,12 @@ static int hid_add_field(struct hid_parser *parser, unsigned report_type, unsign offset = report->size; report->size += parser->global.report_size * parser->global.report_count; + /* Total size check: Allow for possible report index byte */ + if (report->size > (HID_MAX_BUFFER_SIZE - 1) << 3) { + hid_err(parser->device, "report is too long\n"); + return -1; + } + if (!parser->local.usage_index) /* Ignore padding fields */ return 0; @@ -463,10 +490,7 @@ static int hid_parser_local(struct hid_parser *parser, struct hid_item *item) return 0; } - if (item->size <= 2) - data = (parser->global.usage_page << 16) + data; - - return hid_add_usage(parser, data); + return hid_add_usage(parser, data, item->size); case HID_LOCAL_ITEM_TAG_USAGE_MINIMUM: @@ -475,9 +499,6 @@ static int hid_parser_local(struct hid_parser *parser, struct hid_item *item) return 0; } - if (item->size <= 2) - data = (parser->global.usage_page << 16) + data; - parser->local.usage_minimum = data; return 0; @@ -488,9 +509,6 @@ static int hid_parser_local(struct hid_parser *parser, struct hid_item *item) return 0; } - if (item->size <= 2) - data = (parser->global.usage_page << 16) + data; - count = data - parser->local.usage_minimum; if (count + parser->local.usage_index >= HID_MAX_USAGES) { /* @@ -510,7 +528,7 @@ static int hid_parser_local(struct hid_parser *parser, struct hid_item *item) } for (n = parser->local.usage_minimum; n <= data; n++) - if (hid_add_usage(parser, n)) { + if (hid_add_usage(parser, n, item->size)) { dbg_hid("hid_add_usage failed\n"); return -1; } @@ -525,6 +543,41 @@ static int hid_parser_local(struct hid_parser *parser, struct hid_item *item) } /* + * Concatenate Usage Pages into Usages where relevant: + * As per specification, 6.2.2.8: "When the parser encounters a main item it + * concatenates the last declared Usage Page with a Usage to form a complete + * usage value." + */ + +static void hid_concatenate_last_usage_page(struct hid_parser *parser) +{ + int i; + unsigned int usage_page; + unsigned int current_page; + + if (!parser->local.usage_index) + return; + + usage_page = parser->global.usage_page; + + /* + * Concatenate usage page again only if last declared Usage Page + * has not been already used in previous usages concatenation + */ + for (i = parser->local.usage_index - 1; i >= 0; i--) { + if (parser->local.usage_size[i] > 2) + /* Ignore extended usages */ + continue; + + current_page = parser->local.usage[i] >> 16; + if (current_page == usage_page) + break; + + complete_usage(parser, i); + } +} + +/* * Process a main item. */ @@ -533,6 +586,8 @@ static int hid_parser_main(struct hid_parser *parser, struct hid_item *item) __u32 data; int ret; + hid_concatenate_last_usage_page(parser); + data = item_udata(item); switch (item->tag) { @@ -712,6 +767,10 @@ static void hid_scan_feature_usage(struct hid_parser *parser, u32 usage) if (usage == 0xff0000c5 && parser->global.report_count == 256 && parser->global.report_size == 8) parser->scan_flags |= HID_SCAN_FLAG_MT_WIN_8; + + if (usage == 0xff0000c6 && parser->global.report_count == 1 && + parser->global.report_size == 8) + parser->scan_flags |= HID_SCAN_FLAG_MT_WIN_8; } static void hid_scan_collection(struct hid_parser *parser, unsigned type) @@ -746,6 +805,8 @@ static int hid_scan_main(struct hid_parser *parser, struct hid_item *item) __u32 data; int i; + hid_concatenate_last_usage_page(parser); + data = item_udata(item); switch (item->tag) { @@ -947,6 +1008,7 @@ int hid_open_report(struct hid_device *device) __u8 *start; __u8 *buf; __u8 *end; + __u8 *next; int ret; static int (*dispatch_type[])(struct hid_parser *parser, struct hid_item *item) = { @@ -1000,7 +1062,8 @@ int hid_open_report(struct hid_device *device) device->collection_size = HID_DEFAULT_NUM_COLLECTIONS; ret = -EINVAL; - while ((start = fetch_item(start, end, &item)) != NULL) { + while ((next = fetch_item(start, end, &item)) != NULL) { + start = next; if (item.format != HID_ITEM_FORMAT_SHORT) { hid_err(device, "unexpected long global item\n"); @@ -1029,7 +1092,8 @@ int hid_open_report(struct hid_device *device) } } - hid_err(device, "item fetching failed at offset %d\n", (int)(end - start)); + hid_err(device, "item fetching failed at offset %u/%u\n", + size - (unsigned int)(end - start), size); err: vfree(parser); hid_close_report(device); @@ -1483,7 +1547,9 @@ int hid_report_raw_event(struct hid_device *hid, int type, u8 *data, u32 size, rsize = ((report->size - 1) >> 3) + 1; - if (rsize > HID_MAX_BUFFER_SIZE) + if (report_enum->numbered && rsize >= HID_MAX_BUFFER_SIZE) + rsize = HID_MAX_BUFFER_SIZE - 1; + else if (rsize > HID_MAX_BUFFER_SIZE) rsize = HID_MAX_BUFFER_SIZE; if (csize < rsize) { |