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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>
This commit is contained in:
Hans de Goede 2018-07-11 12:38:34 +02:00 committed by Jiri Kosina
parent 79d11f2a20
commit 19588bee0e
1 changed files with 21 additions and 0 deletions
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21
drivers/hid/hid-elan.c
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@ -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",