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SubjectRe: [PATCH] hid-multitouch: Add quirk for VTL touch panels
From
Hi Mathieu,

On Wed, Nov 19, 2014 at 1:41 PM, Mathieu Magnaudet
<mathieu.magnaudet@gmail.com> wrote:
> VTL panels do not switch to the multitouch mode until the input mode
> feature is read by the host. This should normally be done by
> usbhid, but it looks like an other bug prevents usbhid to properly
> retrieve the feature state. As a workaround, we force the reading of
> the feature in mt_set_input_mode for such devices.
>
> Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
> Signed-off-by: Mathieu Magnaudet <mathieu.magnaudet@enac.fr>
> ---
> drivers/hid/hid-ids.h | 3 +++
> drivers/hid/hid-multitouch.c | 27 +++++++++++++++++++++++++++
> 2 files changed, 30 insertions(+)
>
> diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h
> index 7c86373..d6cc6a9 100644
> --- a/drivers/hid/hid-ids.h
> +++ b/drivers/hid/hid-ids.h
> @@ -931,6 +931,9 @@
> #define USB_DEVICE_ID_VERNIER_CYCLOPS 0x0004
> #define USB_DEVICE_ID_VERNIER_LCSPEC 0x0006
>
> +#define USB_VENDOR_ID_VTL 0x0306
> +#define USB_DEVICE_ID_VTL_MULTITOUCH_FF3F 0xff3f
> +
> #define USB_VENDOR_ID_WACOM 0x056a
> #define USB_DEVICE_ID_WACOM_GRAPHIRE_BLUETOOTH 0x81
> #define USB_DEVICE_ID_WACOM_INTUOS4_BLUETOOTH 0x00BD
> diff --git a/drivers/hid/hid-multitouch.c b/drivers/hid/hid-multitouch.c
> index 51e25b9..a4bc111 100644
> --- a/drivers/hid/hid-multitouch.c
> +++ b/drivers/hid/hid-multitouch.c
> @@ -67,6 +67,7 @@ MODULE_LICENSE("GPL");
> #define MT_QUIRK_IGNORE_DUPLICATES (1 << 10)
> #define MT_QUIRK_HOVERING (1 << 11)
> #define MT_QUIRK_CONTACT_CNT_ACCURATE (1 << 12)
> +#define MT_QUIRK_FORCE_GET_FEATURE (1 << 13)
>
> #define MT_INPUTMODE_TOUCHSCREEN 0x02
> #define MT_INPUTMODE_TOUCHPAD 0x03
> @@ -150,6 +151,7 @@ static void mt_post_parse(struct mt_device *td);
> #define MT_CLS_FLATFROG 0x0107
> #define MT_CLS_GENERALTOUCH_TWOFINGERS 0x0108
> #define MT_CLS_GENERALTOUCH_PWT_TENFINGERS 0x0109
> +#define MT_CLS_VTL 0x0110
>
> #define MT_DEFAULT_MAXCONTACT 10
> #define MT_MAX_MAXCONTACT 250
> @@ -255,6 +257,11 @@ static struct mt_class mt_classes[] = {
> .sn_move = 2048,
> .maxcontacts = 40,
> },
> + { .name = MT_CLS_VTL,
> + .quirks = MT_QUIRK_ALWAYS_VALID |
> + MT_QUIRK_CONTACT_CNT_ACCURATE |
> + MT_QUIRK_FORCE_GET_FEATURE,
> + },
> { }
> };
>
> @@ -809,6 +816,9 @@ static void mt_set_input_mode(struct hid_device *hdev)
> struct mt_device *td = hid_get_drvdata(hdev);
> struct hid_report *r;
> struct hid_report_enum *re;
> + struct mt_class *cls = &td->mtclass;
> + char *buf;
> + int report_len;
>
> if (td->inputmode < 0)
> return;
> @@ -816,6 +826,18 @@ static void mt_set_input_mode(struct hid_device *hdev)
> re = &(hdev->report_enum[HID_FEATURE_REPORT]);
> r = re->report_id_hash[td->inputmode];
> if (r) {
> + if (cls->quirks & MT_QUIRK_FORCE_GET_FEATURE) {
> + report_len = ((r->size - 1) >> 3) + 1 + (r->id > 0);
> + buf = kzalloc(report_len, GFP_KERNEL);

Sorry for not spotting this earlier.
These 2 lines can be replaced by a call to hid_alloc_report_buf(r, GFP_KERNEL);

Cheers,
Benjamin

> + if (!buf) {
> + hid_err(hdev, "failed to allocate buffer for report\n");
> + return;
> + }
> + hid_hw_raw_request(hdev, r->id, buf, report_len,
> + HID_FEATURE_REPORT,
> + HID_REQ_GET_REPORT);
> + kfree(buf);
> + }
> r->field[0]->value[td->inputmode_index] = td->inputmode_value;
> hid_hw_request(hdev, r, HID_REQ_SET_REPORT);
> }
> @@ -1281,6 +1303,11 @@ static const struct hid_device_id mt_devices[] = {
> MT_USB_DEVICE(USB_VENDOR_ID_UNITEC,
> USB_DEVICE_ID_UNITEC_USB_TOUCH_0A19) },
>
> + /* VTL panels */
> + { .driver_data = MT_CLS_VTL,
> + MT_USB_DEVICE(USB_VENDOR_ID_VTL,
> + USB_DEVICE_ID_VTL_MULTITOUCH_FF3F) },
> +
> /* Wistron panels */
> { .driver_data = MT_CLS_NSMU,
> MT_USB_DEVICE(USB_VENDOR_ID_WISTRON,
> --
> 1.9.3
>
> --
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