From d170e8e02729ad3bc4924005cec1ad38409d82af Mon Sep 17 00:00:00 2001 From: Nikolai Kondrashov Date: Thu, 3 Mar 2022 08:47:31 +0100 Subject: [PATCH] HID: uclogic: Add support for touch ring reports MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Add support for touch ring to UC-Logic driver. The touch ring reports can be flipped around a specific point to match the orientation and direction reported by the Wacom drivers. The proximity will also be reported similar to the Wacom drivers. Signed-off-by: Nikolai Kondrashov Signed-off-by: José Expósito Signed-off-by: Jiri Kosina --- drivers/hid/hid-uclogic-core.c | 39 +++++++++++++++++++++++++++++++- drivers/hid/hid-uclogic-params.h | 36 +++++++++++++++++++++++++---- 2 files changed, 70 insertions(+), 5 deletions(-) diff --git a/drivers/hid/hid-uclogic-core.c b/drivers/hid/hid-uclogic-core.c index 05147f2d7564..b448616dacb9 100644 --- a/drivers/hid/hid-uclogic-core.c +++ b/drivers/hid/hid-uclogic-core.c @@ -90,6 +90,8 @@ static int uclogic_input_configured(struct hid_device *hdev, const char *suffix = NULL; struct hid_field *field; size_t len; + size_t i; + const struct uclogic_params_frame *frame; /* no report associated (HID_QUIRK_MULTI_INPUT not set) */ if (!hi->report) @@ -104,6 +106,19 @@ static int uclogic_input_configured(struct hid_device *hdev, drvdata->pen_input = hi->input; } + /* If it's one of the frame devices */ + for (i = 0; i < ARRAY_SIZE(params->frame_list); i++) { + frame = ¶ms->frame_list[i]; + if (hi->report->id == frame->id) { + /* + * Disable EV_MSC reports for touch ring interfaces to + * make the Wacom driver pickup touch ring extents + */ + if (frame->touch_ring_byte > 0) + __clear_bit(EV_MSC, hi->input->evbit); + } + } + field = hi->report->field[0]; switch (field->application) { @@ -313,8 +328,16 @@ static int uclogic_raw_event_frame( /* If need to, and can, set pad device ID for Wacom drivers */ if (frame->dev_id_byte > 0 && frame->dev_id_byte < size) { - data[frame->dev_id_byte] = 0xf; + /* If we also have a touch ring and the finger left it */ + if (frame->touch_ring_byte > 0 && + frame->touch_ring_byte < size && + data[frame->touch_ring_byte] == 0) { + data[frame->dev_id_byte] = 0; + } else { + data[frame->dev_id_byte] = 0xf; + } } + /* If need to, and can, read rotary encoder state change */ if (frame->re_lsb > 0 && frame->re_lsb / 8 < size) { unsigned int byte = frame->re_lsb / 8; @@ -341,6 +364,20 @@ static int uclogic_raw_event_frame( drvdata->re_state = state; } + /* If need to, and can, transform the touch ring reports */ + if (frame->touch_ring_byte > 0 && frame->touch_ring_byte < size && + frame->touch_ring_flip_at != 0) { + __s8 value = data[frame->touch_ring_byte]; + + if (value != 0) { + value = frame->touch_ring_flip_at - value; + if (value < 0) + value = frame->touch_ring_max + value; + + data[frame->touch_ring_byte] = value; + } + } + return 0; } diff --git a/drivers/hid/hid-uclogic-params.h b/drivers/hid/hid-uclogic-params.h index 86f616dfbb53..fe13bc36983b 100644 --- a/drivers/hid/hid-uclogic-params.h +++ b/drivers/hid/hid-uclogic-params.h @@ -123,10 +123,32 @@ struct uclogic_params_frame { /* * Offset of the Wacom-style device ID byte in the report, to be set * to pad device ID (0xf), for compatibility with Wacom drivers. Zero - * if no changes to the report should be made. Only valid if "id" is - * not zero. + * if no changes to the report should be made. The ID byte will be set + * to zero whenever the byte pointed by "touch_ring_byte" is zero, if + * the latter is valid. Only valid if "id" is not zero. */ unsigned int dev_id_byte; + /* + * Offset of the touch ring state byte, in the report. + * Zero if not present. If dev_id_byte is also valid and non-zero, + * then the device ID byte will be cleared when the byte pointed to by + * this offset is zero. Only valid if "id" is not zero. + */ + unsigned int touch_ring_byte; + + /* + * Maximum value of the touch ring report. + * The minimum valid value is considered to be one, + * with zero being out-of-proximity (finger lift) value. + */ + __s8 touch_ring_max; + + /* + * The value to anchor the reversed reports at. + * I.e. one, if the reports should be flipped without offset. + * Zero if no reversal should be done. + */ + __s8 touch_ring_flip_at; }; /* @@ -191,7 +213,10 @@ extern int uclogic_params_init(struct uclogic_params *params, ".frame_list[0].desc_size = %u\n" \ ".frame_list[0].id = %u\n" \ ".frame_list[0].re_lsb = %u\n" \ - ".frame_list[0].dev_id_byte = %u\n" + ".frame_list[0].dev_id_byte = %u\n" \ + ".frame_list[0].touch_ring_byte = %u\n" \ + ".frame_list[0].touch_ring_max = %hhd\n" \ + ".frame_list[0].touch_ring_flip_at = %hhd\n" /* Tablet interface parameters *printf format arguments */ #define UCLOGIC_PARAMS_FMT_ARGS(_params) \ @@ -210,7 +235,10 @@ extern int uclogic_params_init(struct uclogic_params *params, (_params)->frame_list[0].desc_size, \ (_params)->frame_list[0].id, \ (_params)->frame_list[0].re_lsb, \ - (_params)->frame_list[0].dev_id_byte + (_params)->frame_list[0].dev_id_byte, \ + (_params)->frame_list[0].touch_ring_byte, \ + (_params)->frame_list[0].touch_ring_max, \ + (_params)->frame_list[0].touch_ring_flip_at /* Get a replacement report descriptor for a tablet's interface. */ extern int uclogic_params_get_desc(const struct uclogic_params *params,