diff options
Diffstat (limited to 'drivers/hid/hid-logitech-hidpp.c')
| -rw-r--r-- | drivers/hid/hid-logitech-hidpp.c | 50 |
1 files changed, 32 insertions, 18 deletions
diff --git a/drivers/hid/hid-logitech-hidpp.c b/drivers/hid/hid-logitech-hidpp.c index e8a552c8801d..ecf1b1e22e1a 100644 --- a/drivers/hid/hid-logitech-hidpp.c +++ b/drivers/hid/hid-logitech-hidpp.c @@ -51,7 +51,7 @@ MODULE_PARM_DESC(disable_tap_to_click, #define HIDPP_REPORT_SHORT_LENGTH 7 #define HIDPP_REPORT_LONG_LENGTH 20 -#define HIDPP_REPORT_VERY_LONG_LENGTH 64 +#define HIDPP_REPORT_VERY_LONG_MAX_LENGTH 64 #define HIDPP_QUIRK_CLASS_WTP BIT(0) #define HIDPP_QUIRK_CLASS_M560 BIT(1) @@ -106,13 +106,13 @@ MODULE_PARM_DESC(disable_tap_to_click, struct fap { u8 feature_index; u8 funcindex_clientid; - u8 params[HIDPP_REPORT_VERY_LONG_LENGTH - 4U]; + u8 params[HIDPP_REPORT_VERY_LONG_MAX_LENGTH - 4U]; }; struct rap { u8 sub_id; u8 reg_address; - u8 params[HIDPP_REPORT_VERY_LONG_LENGTH - 4U]; + u8 params[HIDPP_REPORT_VERY_LONG_MAX_LENGTH - 4U]; }; struct hidpp_report { @@ -162,6 +162,7 @@ struct hidpp_device { void *send_receive_buf; char *name; /* will never be NULL and should not be freed */ wait_queue_head_t wait; + int very_long_report_length; bool answer_available; u8 protocol_major; u8 protocol_minor; @@ -214,7 +215,7 @@ static int __hidpp_send_report(struct hid_device *hdev, fields_count = HIDPP_REPORT_LONG_LENGTH; break; case REPORT_ID_HIDPP_VERY_LONG: - fields_count = HIDPP_REPORT_VERY_LONG_LENGTH; + fields_count = hidpp->very_long_report_length; break; default: return -ENODEV; @@ -340,7 +341,7 @@ static int hidpp_send_rap_command_sync(struct hidpp_device *hidpp_dev, max_count = HIDPP_REPORT_LONG_LENGTH - 4; break; case REPORT_ID_HIDPP_VERY_LONG: - max_count = HIDPP_REPORT_VERY_LONG_LENGTH - 4; + max_count = hidpp_dev->very_long_report_length - 4; break; default: return -EINVAL; @@ -934,7 +935,7 @@ static int hidpp_devicenametype_get_device_name(struct hidpp_device *hidpp, switch (response.report_id) { case REPORT_ID_HIDPP_VERY_LONG: - count = HIDPP_REPORT_VERY_LONG_LENGTH - 4; + count = hidpp->very_long_report_length - 4; break; case REPORT_ID_HIDPP_LONG: count = HIDPP_REPORT_LONG_LENGTH - 4; @@ -2923,7 +2924,7 @@ static int hidpp_raw_event(struct hid_device *hdev, struct hid_report *report, /* Generic HID++ processing. */ switch (data[0]) { case REPORT_ID_HIDPP_VERY_LONG: - if (size != HIDPP_REPORT_VERY_LONG_LENGTH) { + if (size != hidpp->very_long_report_length) { hid_err(hdev, "received hid++ report of bad size (%d)", size); return 1; @@ -3226,24 +3227,34 @@ static const struct attribute_group ps_attribute_group = { .attrs = sysfs_attrs }; -static bool hidpp_validate_report(struct hid_device *hdev, int id, int size, - bool optional) +static int hidpp_get_report_length(struct hid_device *hdev, int id) { struct hid_report_enum *re; struct hid_report *report; + re = &(hdev->report_enum[HID_OUTPUT_REPORT]); + report = re->report_id_hash[id]; + if (!report) + return 0; + + return report->field[0]->report_count + 1; +} + +static bool hidpp_validate_report(struct hid_device *hdev, int id, + int expected_length, bool optional) +{ + int report_length; + if (id >= HID_MAX_IDS || id < 0) { hid_err(hdev, "invalid HID report id %u\n", id); return false; } - re = &(hdev->report_enum[HID_OUTPUT_REPORT]); - report = re->report_id_hash[id]; - - if (!report) + report_length = hidpp_get_report_length(hdev, id); + if (!report_length) return optional; - if (report->field[0]->report_count < size) { + if (report_length < expected_length) { hid_warn(hdev, "not enough values in hidpp report %d\n", id); return false; } @@ -3254,11 +3265,9 @@ static bool hidpp_validate_report(struct hid_device *hdev, int id, int size, static bool hidpp_validate_device(struct hid_device *hdev) { return hidpp_validate_report(hdev, REPORT_ID_HIDPP_SHORT, - HIDPP_REPORT_SHORT_LENGTH - 1, false) && + HIDPP_REPORT_SHORT_LENGTH, false) && hidpp_validate_report(hdev, REPORT_ID_HIDPP_LONG, - HIDPP_REPORT_LONG_LENGTH - 1, true) && - hidpp_validate_report(hdev, REPORT_ID_HIDPP_VERY_LONG, - HIDPP_REPORT_VERY_LONG_LENGTH - 1, true); + HIDPP_REPORT_LONG_LENGTH, true); } static int hidpp_probe(struct hid_device *hdev, const struct hid_device_id *id) @@ -3291,6 +3300,11 @@ static int hidpp_probe(struct hid_device *hdev, const struct hid_device_id *id) hidpp->quirks = id->driver_data; + hidpp->very_long_report_length = + hidpp_get_report_length(hdev, REPORT_ID_HIDPP_VERY_LONG); + if (hidpp->very_long_report_length > HIDPP_REPORT_VERY_LONG_MAX_LENGTH) + hidpp->very_long_report_length = HIDPP_REPORT_VERY_LONG_MAX_LENGTH; + if (id->group == HID_GROUP_LOGITECH_DJ_DEVICE) hidpp->quirks |= HIDPP_QUIRK_UNIFYING; |