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| author |   Hans de Goede <hdegoede@redhat.com> | 2018-07-11 12:38:34 +0200 |
|---|---|---|
| committer |   Jiri Kosina <jkosina@suse.cz> | 2018-07-17 15:25:40 +0200 |
| commit | 19588bee0ea569bd6cc6bea5b284c34f1f526a59 (patch) | |
| tree | 3209e2ae9ac7764afa541b073cd4ebfdbed8d8ed /drivers/hid/hid-elan.c | |
| parent | HID: elan: Query device max_x and max_y value from touchpad (diff) | |
| download | wireguard-linux-19588bee0ea569bd6cc6bea5b284c34f1f526a59.tar.xz wireguard-linux-19588bee0ea569bd6cc6bea5b284c34f1f526a59.zip | |
HID: elan: Query resolution from the touchpad
Query the resolution from the touchpad and report it to userspace
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'drivers/hid/hid-elan.c')
| -rw-r--r-- | drivers/hid/hid-elan.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/drivers/hid/hid-elan.c b/drivers/hid/hid-elan.c index d696b57f1ccd..6969fb5344a5 100644 --- a/drivers/hid/hid-elan.c +++ b/drivers/hid/hid-elan.c @@ -43,6 +43,8 @@ struct elan_drvdata { u8 mute_led_state; u16 max_x; u16 max_y; + u16 res_x; + u16 res_y; }; static int is_not_elan_touchpad(struct hid_device *hdev) @@ -97,6 +99,15 @@ static int elan_get_device_param(struct hid_device *hdev, return 0; } +static unsigned int elan_convert_res(char val) +{ + /* + * (value from firmware) * 10 + 790 = dpi + * dpi * 10 / 254 = dots/mm + */ + return (val * 10 + 790) * 10 / 254; +} + static int elan_get_device_params(struct hid_device *hdev) { struct elan_drvdata *drvdata = hid_get_drvdata(hdev); @@ -119,6 +130,13 @@ static int elan_get_device_params(struct hid_device *hdev) drvdata->max_y = (dmabuf[4] << 8) | dmabuf[3]; + ret = elan_get_device_param(hdev, dmabuf, ELAN_PARAM_RES); + if (ret) + goto err; + + drvdata->res_x = elan_convert_res(dmabuf[3]); + drvdata->res_y = elan_convert_res(dmabuf[4]); + err: kfree(dmabuf); return ret; @@ -166,6 +184,9 @@ static int elan_input_configured(struct hid_device *hdev, struct hid_input *hi) return ret; } + input_abs_set_res(input, ABS_X, drvdata->res_x); + input_abs_set_res(input, ABS_Y, drvdata->res_y); + ret = input_register_device(input); if (ret) { hid_err(hdev, "Failed to register elan input device: %d\n", |