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author | Benjamin Tissoires <benjamin.tissoires@gmail.com> | 2012-11-14 15:59:15 (GMT) |
---|---|---|
committer | Jiri Kosina <jkosina@suse.cz> | 2012-11-15 09:07:55 (GMT) |
commit | 774638386826621c984ab6994439f474709cac5e (patch) | |
tree | 897fb8a15947768f7dc9521027c7c20fe830c1bf /drivers/hid | |
parent | ccdd699411b77c463022ebac311eb4a06ca56db4 (diff) | |
download | linux-774638386826621c984ab6994439f474709cac5e.tar.xz |
HID: fix unit exponent parsing
HID spec details special values for the HID field unit exponent.
Basically, the range [0x8..0xf] correspond to [-8..-1], so this is
a standard two's complement on a half-byte.
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@gmail.com>
Acked-by: Jiri Kosina <jkosina@suse.cz>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers/hid')
-rw-r--r-- | drivers/hid/hid-core.c | 16 | ||||
-rw-r--r-- | drivers/hid/hid-input.c | 13 |
2 files changed, 24 insertions, 5 deletions
diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c index f4109fd..f5004e2 100644 --- a/drivers/hid/hid-core.c +++ b/drivers/hid/hid-core.c @@ -315,6 +315,7 @@ static s32 item_sdata(struct hid_item *item) static int hid_parser_global(struct hid_parser *parser, struct hid_item *item) { + __u32 raw_value; switch (item->tag) { case HID_GLOBAL_ITEM_TAG_PUSH: @@ -365,7 +366,14 @@ static int hid_parser_global(struct hid_parser *parser, struct hid_item *item) return 0; case HID_GLOBAL_ITEM_TAG_UNIT_EXPONENT: - parser->global.unit_exponent = item_sdata(item); + /* Units exponent negative numbers are given through a + * two's complement. + * See "6.2.2.7 Global Items" for more information. */ + raw_value = item_udata(item); + if (!(raw_value & 0xfffffff0)) + parser->global.unit_exponent = hid_snto32(raw_value, 4); + else + parser->global.unit_exponent = raw_value; return 0; case HID_GLOBAL_ITEM_TAG_UNIT: @@ -865,6 +873,12 @@ static s32 snto32(__u32 value, unsigned n) return value & (1 << (n - 1)) ? value | (-1 << n) : value; } +s32 hid_snto32(__u32 value, unsigned n) +{ + return snto32(value, n); +} +EXPORT_SYMBOL_GPL(hid_snto32); + /* * Convert a signed 32-bit integer to a signed n-bit integer. */ diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c index 1b0adc3..007a943 100644 --- a/drivers/hid/hid-input.c +++ b/drivers/hid/hid-input.c @@ -192,7 +192,6 @@ static int hidinput_setkeycode(struct input_dev *dev, return -EINVAL; } - /** * hidinput_calc_abs_res - calculate an absolute axis resolution * @field: the HID report field to calculate resolution for @@ -235,17 +234,23 @@ __s32 hidinput_calc_abs_res(const struct hid_field *field, __u16 code) case ABS_MT_TOOL_Y: case ABS_MT_TOUCH_MAJOR: case ABS_MT_TOUCH_MINOR: - if (field->unit == 0x11) { /* If centimeters */ + if (field->unit & 0xffffff00) /* Not a length */ + return 0; + unit_exponent += hid_snto32(field->unit >> 4, 4) - 1; + switch (field->unit & 0xf) { + case 0x1: /* If centimeters */ /* Convert to millimeters */ unit_exponent += 1; - } else if (field->unit == 0x13) { /* If inches */ + break; + case 0x3: /* If inches */ /* Convert to millimeters */ prev = physical_extents; physical_extents *= 254; if (physical_extents < prev) return 0; unit_exponent -= 1; - } else { + break; + default: return 0; } break; |