Add pen support based on Himax Android driver, that provides two versions
of pen data structure. Pen support is activated in device-tree by
"pen-present" property. Its value is the version number. We tested with:
pen-present = <1>;
Additional set of device-properties must be used to set pen resolution
and axis orientation:
pen-size-x = <2000>;
pen-size-y = <1200>;
...
Touchscreen size device-properties may be added for pen points/mm
calculation:
touchscreen-x-mm = <239>;
touchscreen-y-mm = <143>;
Tested on: Starry Electronic XR109IA2T LCM (HX83102J)
Signed-off-by: Dmitry Mastykin <mastichi@xxxxxxxxx>
---
drivers/input/touchscreen/himax_hx83112b.c | 135 ++++++++++++++++++++-
1 file changed, 131 insertions(+), 4 deletions(-)
diff --git a/drivers/input/touchscreen/himax_hx83112b.c b/drivers/input/touchscreen/himax_hx83112b.c
index 8f112e3038dd..6cabc0fadb68 100644
--- a/drivers/input/touchscreen/himax_hx83112b.c
+++ b/drivers/input/touchscreen/himax_hx83112b.c
@@ -42,6 +42,11 @@
#define HIMAX_INVALID_COORD 0xffff
+/* default resolution in points/mm */
+#define HIMAX_RESOLUTION 10
+
+#define HIMAX_SENSING_CHANNELS 1600
+
struct himax_event_point {
__be16 x;
__be16 y;
@@ -54,9 +59,32 @@ struct himax_event {
u8 num_points;
u8 pad1[2];
u8 checksum_fix;
+ __be16 p_x;
+ __be16 p_y;
+ __be16 p_w;
+ union {
+ struct {
+ s8 tilt_x;
+ u8 hover;
+ u8 btn;
+ u8 btn2;
+ s8 tilt_y;
+ u8 pad;
+ } p_v1;
+ struct {
+ s8 tilt_x;
+ s8 tilt_y;
+ u8 status;
+ u8 pad[3];
+ } p_v2;
+ };
} __packed;
-static_assert(sizeof(struct himax_event) == 56);
+#define HIMAX_PEN_HOVER BIT(0)
+#define HIMAX_PEN_BTN BIT(1)
+#define HIMAX_PEN_BTN2 BIT(2)
+
+static_assert(sizeof(struct himax_event) == 68);
struct himax_ts_data;
struct himax_chip {
@@ -70,9 +98,12 @@ struct himax_ts_data {
const struct himax_chip *chip;
struct gpio_desc *gpiod_rst;
struct input_dev *input_dev;
+ struct input_dev *pen_input_dev;
struct i2c_client *client;
struct regmap *regmap;
+ u32 pen;
struct touchscreen_properties props;
+ struct touchscreen_properties pen_props;
};
static const struct regmap_config himax_regmap_config = {
@@ -214,6 +245,52 @@ static int himax_input_register(struct himax_ts_data *ts)
return 0;
}
+static int himax_pen_input_register(struct himax_ts_data *ts)
+{
+ struct input_dev *input;
+ int error;
+ u32 x_mm, y_mm;
+
+ input = devm_input_allocate_device(&ts->client->dev);
+ if (!input) {
+ dev_err(&ts->client->dev, "Failed to allocate input device\n");
+ return -ENOMEM;
+ }
+ ts->pen_input_dev = input;
+
+ input->name = "Himax Pen Input";
+
+ if (device_property_read_u32(&ts->client->dev, "touchscreen-x-mm", &x_mm) ||
+ device_property_read_u32(&ts->client->dev, "touchscreen-y-mm", &y_mm)) {
+ input_abs_set_res(input, ABS_X, HIMAX_RESOLUTION);
+ input_abs_set_res(input, ABS_Y, HIMAX_RESOLUTION);
+ } else {
+ input_abs_set_res(input, ABS_X, HIMAX_SENSING_CHANNELS / x_mm);
+ input_abs_set_res(input, ABS_Y, HIMAX_SENSING_CHANNELS / y_mm);
+ }
+
+ input_set_capability(input, EV_ABS, ABS_X);
+ input_set_capability(input, EV_ABS, ABS_Y);
+ input_set_abs_params(input, ABS_PRESSURE, 0, 4095, 0, 0);
+ input_set_abs_params(input, ABS_TILT_X, -60, 60, 0, 0);
+ input_set_abs_params(input, ABS_TILT_Y, -60, 60, 0, 0);
+ input_set_capability(input, EV_KEY, BTN_TOUCH);
+ input_set_capability(input, EV_KEY, BTN_STYLUS);
+ input_set_capability(input, EV_KEY, BTN_STYLUS2);
+ input_set_capability(input, EV_KEY, BTN_TOOL_PEN);
+
+ touchscreen_parse_properties_prefix(ts->pen_input_dev, false, &ts->pen_props, "pen");
+
+ error = input_register_device(input);
+ if (error) {
+ dev_err(&ts->client->dev,
+ "Failed to register input device: %d\n", error);
+ return error;
+ }
+
+ return 0;
+}
+
static u8 himax_event_get_num_points(const struct himax_event *event)
{
if (event->num_points == 0xff)
@@ -257,6 +334,45 @@ static void himax_process_event(struct himax_ts_data *ts,
input_sync(ts->input_dev);
}
+static void himax_process_pen(struct himax_ts_data *ts,
+ const struct himax_event *event)
+{
+ struct input_dev *dev = ts->pen_input_dev;
+ s8 tilt_x, tilt_y;
+ bool hover, btn, btn2;
+ u16 x = be16_to_cpu(event->p_x);
+ u16 y = be16_to_cpu(event->p_y);
+ bool valid = x < ts->pen_props.max_x && y < ts->pen_props.max_y;
+
+ if (ts->pen == 2) {
+ tilt_x = event->p_v2.tilt_x;
+ tilt_y = event->p_v2.tilt_y;
+ hover = event->p_v2.status & HIMAX_PEN_HOVER;
+ btn = event->p_v2.status & HIMAX_PEN_BTN;
+ btn2 = event->p_v2.status & HIMAX_PEN_BTN2;
+ } else {
+ tilt_x = event->p_v1.tilt_x;
+ tilt_y = event->p_v1.tilt_y;
+ hover = event->p_v1.hover;
+ btn = event->p_v1.btn;
+ btn2 = event->p_v1.btn2;
+ }
+
+ input_report_key(dev, BTN_TOOL_PEN, valid);
+
+ if (valid) {
+ input_report_key(dev, BTN_TOUCH, !hover);
+ touchscreen_report_pos(dev, &ts->pen_props, x, y, false);
+ input_report_abs(dev, ABS_PRESSURE, be16_to_cpu(event->p_w));
+ input_report_abs(dev, ABS_TILT_X, tilt_x);
+ input_report_abs(dev, ABS_TILT_Y, tilt_y);
+ input_report_key(dev, BTN_STYLUS, btn);
+ input_report_key(dev, BTN_STYLUS2, btn2);
+ }
+
+ input_sync(dev);
+}
+
static bool himax_verify_checksum(struct himax_ts_data *ts,
const struct himax_event *event)
{
@@ -264,7 +380,7 @@ static bool himax_verify_checksum(struct himax_ts_data *ts,
int i;
u16 checksum = 0;
- for (i = 0; i < sizeof(*event); i++)
+ for (i = 0; i <= offsetof(struct himax_event, checksum_fix); i++)
checksum += data[i];
if ((checksum & 0x00ff) != 0) {
@@ -293,8 +409,9 @@ static int himax_handle_input(struct himax_ts_data *ts)
{
int error;
struct himax_event event;
+ size_t length = ts->pen ? sizeof(event) : offsetof(struct himax_event, p_x);
- error = ts->chip->read_events(ts, &event, sizeof(event));
+ error = ts->chip->read_events(ts, &event, length);
if (error) {
dev_err(&ts->client->dev, "Failed to read input event: %d\n",
error);
@@ -305,8 +422,11 @@ static int himax_handle_input(struct himax_ts_data *ts)
* Only process the current event when it has a valid checksum but
* don't consider it a fatal error when it doesn't.
*/
- if (himax_verify_checksum(ts, &event))
+ if (himax_verify_checksum(ts, &event)) {
himax_process_event(ts, &event);
+ if (ts->pen)
+ himax_process_pen(ts, &event);
+ }
return 0;
}
@@ -368,6 +488,13 @@ static int himax_probe(struct i2c_client *client)
if (error)
return error;
+ device_property_read_u32(dev, "pen-present", &ts->pen);
+ if (ts->pen) {
+ error = himax_pen_input_register(ts);
+ if (error)
+ return error;
+ }
+
error = devm_request_threaded_irq(dev, client->irq, NULL,
himax_irq_handler, IRQF_ONESHOT,
client->name, ts);
--
2.34.1
