From: Benjamin Tissoires benjamin.tissoires@redhat.com
commit d43c17ead879ba7c076dc2f5fd80cd76047c9ff4 upstream.
Some old mice have a tendency to not accept the high resolution multiplier. They reply with a -EPIPE which was previously ignored.
Force the call to resolution multiplier to be synchronous and actually check for the answer. If this fails, consider the mouse like a normal one.
Fixes: 2dc702c991e377 ("HID: input: use the Resolution Multiplier for high-resolution scrolling") Link: https://bugzilla.redhat.com/show_bug.cgi?id=1700071 Reported-and-tested-by: James Feeney james@nurealm.net Cc: stable@vger.kernel.org # v5.0+ Signed-off-by: Benjamin Tissoires benjamin.tissoires@redhat.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/hid/hid-core.c | 7 ++-- drivers/hid/hid-input.c | 81 +++++++++++++++++++++++++++++------------------- include/linux/hid.h | 2 - 3 files changed, 56 insertions(+), 34 deletions(-)
--- a/drivers/hid/hid-core.c +++ b/drivers/hid/hid-core.c @@ -1636,7 +1636,7 @@ static struct hid_report *hid_get_report * Implement a generic .request() callback, using .raw_request() * DO NOT USE in hid drivers directly, but through hid_hw_request instead. */ -void __hid_request(struct hid_device *hid, struct hid_report *report, +int __hid_request(struct hid_device *hid, struct hid_report *report, int reqtype) { char *buf; @@ -1645,7 +1645,7 @@ void __hid_request(struct hid_device *hi
buf = hid_alloc_report_buf(report, GFP_KERNEL); if (!buf) - return; + return -ENOMEM;
len = hid_report_len(report);
@@ -1662,8 +1662,11 @@ void __hid_request(struct hid_device *hi if (reqtype == HID_REQ_GET_REPORT) hid_input_report(hid, report->type, buf, ret, 0);
+ ret = 0; + out: kfree(buf); + return ret; } EXPORT_SYMBOL_GPL(__hid_request);
--- a/drivers/hid/hid-input.c +++ b/drivers/hid/hid-input.c @@ -1557,52 +1557,71 @@ static void hidinput_close(struct input_ hid_hw_close(hid); }
-static void hidinput_change_resolution_multipliers(struct hid_device *hid) +static bool __hidinput_change_resolution_multipliers(struct hid_device *hid, + struct hid_report *report, bool use_logical_max) { - struct hid_report_enum *rep_enum; - struct hid_report *rep; struct hid_usage *usage; + bool update_needed = false; int i, j;
- rep_enum = &hid->report_enum[HID_FEATURE_REPORT]; - list_for_each_entry(rep, &rep_enum->report_list, list) { - bool update_needed = false; + if (report->maxfield == 0) + return false;
- if (rep->maxfield == 0) - continue; + /* + * If we have more than one feature within this report we + * need to fill in the bits from the others before we can + * overwrite the ones for the Resolution Multiplier. + */ + if (report->maxfield > 1) { + hid_hw_request(hid, report, HID_REQ_GET_REPORT); + hid_hw_wait(hid); + }
- /* - * If we have more than one feature within this report we - * need to fill in the bits from the others before we can - * overwrite the ones for the Resolution Multiplier. + for (i = 0; i < report->maxfield; i++) { + __s32 value = use_logical_max ? + report->field[i]->logical_maximum : + report->field[i]->logical_minimum; + + /* There is no good reason for a Resolution + * Multiplier to have a count other than 1. + * Ignore that case. */ - if (rep->maxfield > 1) { - hid_hw_request(hid, rep, HID_REQ_GET_REPORT); - hid_hw_wait(hid); - } + if (report->field[i]->report_count != 1) + continue;
- for (i = 0; i < rep->maxfield; i++) { - __s32 logical_max = rep->field[i]->logical_maximum; + for (j = 0; j < report->field[i]->maxusage; j++) { + usage = &report->field[i]->usage[j];
- /* There is no good reason for a Resolution - * Multiplier to have a count other than 1. - * Ignore that case. - */ - if (rep->field[i]->report_count != 1) + if (usage->hid != HID_GD_RESOLUTION_MULTIPLIER) continue;
- for (j = 0; j < rep->field[i]->maxusage; j++) { - usage = &rep->field[i]->usage[j]; + *report->field[i]->value = value; + update_needed = true; + } + } + + return update_needed; +} + +static void hidinput_change_resolution_multipliers(struct hid_device *hid) +{ + struct hid_report_enum *rep_enum; + struct hid_report *rep; + int ret;
- if (usage->hid != HID_GD_RESOLUTION_MULTIPLIER) - continue; + rep_enum = &hid->report_enum[HID_FEATURE_REPORT]; + list_for_each_entry(rep, &rep_enum->report_list, list) { + bool update_needed = __hidinput_change_resolution_multipliers(hid, + rep, true);
- *rep->field[i]->value = logical_max; - update_needed = true; + if (update_needed) { + ret = __hid_request(hid, rep, HID_REQ_SET_REPORT); + if (ret) { + __hidinput_change_resolution_multipliers(hid, + rep, false); + return; } } - if (update_needed) - hid_hw_request(hid, rep, HID_REQ_SET_REPORT); }
/* refresh our structs */ --- a/include/linux/hid.h +++ b/include/linux/hid.h @@ -894,7 +894,7 @@ struct hid_field *hidinput_get_led_field unsigned int hidinput_count_leds(struct hid_device *hid); __s32 hidinput_calc_abs_res(const struct hid_field *field, __u16 code); void hid_output_report(struct hid_report *report, __u8 *data); -void __hid_request(struct hid_device *hid, struct hid_report *rep, int reqtype); +int __hid_request(struct hid_device *hid, struct hid_report *rep, int reqtype); u8 *hid_alloc_report_buf(struct hid_report *report, gfp_t flags); struct hid_device *hid_allocate_device(void); struct hid_report *hid_register_report(struct hid_device *device,