@@ -35,6 +35,7 @@
#define HIDEEP_EVENT_ADDR 0x240
/* command list */
+#define HIDEEP_WORK_MODE 0x081e
#define HIDEEP_RESET_CMD 0x9800
/* event bit */
@@ -964,6 +965,17 @@ static const struct attribute_group hideep_ts_attr_group = {
.attrs = hideep_ts_sysfs_entries,
};
+static void hideep_set_work_mode(struct hideep_ts *ts)
+{
+ /*
+ * Reset touch report format to the native HiDeep 20 protocol if requested.
+ * This is necessary to make touchscreens which come up in I2C-HID mode
+ * work with this driver.
+ */
+ if (device_property_read_bool(&ts->client->dev, "hideep,reset-work-mode"))
+ regmap_write(ts->reg, HIDEEP_WORK_MODE, 0x00);
+}
+
static int __maybe_unused hideep_suspend(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
@@ -987,6 +999,8 @@ static int __maybe_unused hideep_resume(struct device *dev)
return error;
}
+ hideep_set_work_mode(ts);
+
enable_irq(client->irq);
return 0;
@@ -1063,6 +1077,8 @@ static int hideep_probe(struct i2c_client *client)
return error;
}
+ hideep_set_work_mode(ts);
+
error = hideep_init_input(ts);
if (error)
return error;
The HiDeep IST940E touchscreen controller used on the Lenovo Yoga Book X90F convertible comes up in HID mode by default. This works well on the X91F Windows model where the touchscreen is correctly described in ACPI and ACPI takes care of controlling the reset GPIO and regulators. But the X90F ships with Android and the ACPI tables on this model don't describe the touchscreen. Instead this is hardcoded in the vendor kernel. The vendor kernel uses the touchscreen in native HiDeep 20 (2.0?) protocol mode and switches the controller to this mode by writing 0 to reg 0x081e. Adjusting the i2c-hid code to deal with the reset-gpio and regulators on this non devicetree (but rather broken ACPI) convertible is somewhat tricky and the native protocol reports ABS_MT_PRESSURE and ABS_MT_TOUCH_MAJOR which are not reported in HID mode, so it is preferable to use the native mode. Add support to the hideep driver to reset the work-mode to the native HiDeep protocol to allow using it on the Lenovo Yoga Book X90F. This is guarded behind a new "hideep,reset-work-mode" boolean property, to avoid changing behavior on other devices. For the record: I did test using the i2c-hid driver with some quick hacks and it does work. The I2C-HID descriptor is available from address 0x0020, just like on the X91F Windows model. So far the new "hideep,reset-work-mode" property is only used on x86/ACPI (non devicetree) devs. IOW it is not used in actual devicetree files. The devicetree-bindings maintainers have requested properties like these to not be added to the devicetree-bindings, so the new property is deliberately not added to the existing devicetree-bindings. Signed-off-by: Hans de Goede <hdegoede@redhat.com> --- Changes in v3: - Do not add the x86/acpi only property to the dt-bindings doc Changes in v2: - New patch in v2 of this patch-set --- drivers/input/touchscreen/hideep.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+)