This change creates a second input device which will handle input from
a Surface Pen. The Surface Pen supplies a different packet header than
touch events, so it is simple to handle one or the other.
This patch handles both the newer Surface Pen with one button, and the
older variant with a second button to switch to Eraser mode.
Signed-off-by: Stephen Just <stephenjust@xxxxxxxxx>
---
drivers/input/touchscreen/surface3_spi.c | 102 +++++++++++++++++++++++++++++++
1 file changed, 102 insertions(+)
diff --git a/drivers/input/touchscreen/surface3_spi.c b/drivers/input/touchscreen/surface3_spi.c
index 204a162..52a2cde 100644
--- a/drivers/input/touchscreen/surface3_spi.c
+++ b/drivers/input/touchscreen/surface3_spi.c
@@ -28,11 +28,13 @@
#define SURFACE3_PACKET_SIZE 264
#define SURFACE3_REPORT_TOUCH 0xd2
+#define SURFACE3_REPORT_PEN 0x16
struct surface3_ts_data {
struct spi_device *spi;
struct gpio_desc *gpiod_rst[2];
struct input_dev *input_dev;
+ struct input_dev *pen_input_dev;
u8 rd_buf[SURFACE3_PACKET_SIZE] ____cacheline_aligned;
};
@@ -49,6 +51,14 @@ struct surface3_ts_data_finger {
u32 padding;
} __packed;
+struct surface3_ts_data_pen {
+ u8 status;
+ __le16 x;
+ __le16 y;
+ __le16 pressure;
+ u8 padding;
+} __packed;
+
static int surface3_spi_read(struct surface3_ts_data *ts_data)
{
struct spi_device *spi = ts_data->spi;
@@ -114,6 +124,52 @@ static void surface3_spi_process_touch(struct surface3_ts_data *ts_data, u8 *dat
input_sync(ts_data->input_dev);
}
+static void surface3_spi_report_pen(struct surface3_ts_data *ts_data,
+ struct surface3_ts_data_pen *pen)
+{
+ int st = pen->status;
+ int prox = st & 0x01;
+ int rubber = st & 0x18;
+
+ input_report_key(ts_data->pen_input_dev,
+ BTN_TOUCH,
+ (st & 0x12));
+
+ input_report_key(ts_data->pen_input_dev,
+ BTN_TOOL_PEN,
+ prox && !rubber);
+
+ input_report_key(ts_data->pen_input_dev,
+ BTN_TOOL_RUBBER,
+ prox && rubber);
+
+ if (st) {
+ input_report_key(ts_data->pen_input_dev,
+ BTN_STYLUS,
+ st & 0x04);
+
+ input_report_abs(ts_data->pen_input_dev,
+ ABS_X,
+ get_unaligned_le16(&pen->x));
+ input_report_abs(ts_data->pen_input_dev,
+ ABS_Y,
+ get_unaligned_le16(&pen->y));
+ input_report_abs(ts_data->pen_input_dev,
+ ABS_PRESSURE,
+ get_unaligned_le16(&pen->pressure));
+ }
+}
+
+static void surface3_spi_process_pen(struct surface3_ts_data *ts_data, u8 *data)
+{
+ struct surface3_ts_data_pen *pen;
+
+ pen = (struct surface3_ts_data_pen *)&data[15];
+
+ surface3_spi_report_pen(ts_data, pen);
+ input_sync(ts_data->pen_input_dev);
+}
+
static void surface3_spi_process(struct surface3_ts_data *ts_data)
{
const char header[] = {0xff, 0xff, 0xff, 0xff, 0xa5, 0x5a, 0xe7, 0x7e, 0x01};
@@ -127,6 +183,8 @@ static void surface3_spi_process(struct surface3_ts_data *ts_data)
if (data[9] == SURFACE3_REPORT_TOUCH)
surface3_spi_process_touch(ts_data, data);
+ else if (data[9] == SURFACE3_REPORT_PEN)
+ surface3_spi_process_pen(ts_data, data);
else
dev_err(&ts_data->spi->dev,
"%s unknown packet type: %x, ignoring...\n",
@@ -224,6 +282,46 @@ static int surface3_spi_create_touch_input(struct surface3_ts_data *data)
return 0;
}
+static int surface3_spi_create_pen_input(struct surface3_ts_data *data)
+{
+ struct input_dev *input;
+ int error;
+
+ input = devm_input_allocate_device(&data->spi->dev);
+ if (!input)
+ return -ENOMEM;
+
+ data->pen_input_dev = input;
+
+ __set_bit(INPUT_PROP_DIRECT, input->propbit);
+ __set_bit(INPUT_PROP_POINTER, input->propbit);
+ input_set_abs_params(input, ABS_X, 0, 9600, 0, 0);
+ input_abs_set_res(input, ABS_X, 40);
+ input_set_abs_params(input, ABS_Y, 0, 7200, 0, 0);
+ input_abs_set_res(input, ABS_Y, 48);
+ input_set_abs_params(input, ABS_PRESSURE, 0, 1024, 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_TOOL_PEN);
+ input_set_capability(input, EV_KEY, BTN_TOOL_RUBBER);
+
+ input->name = "Surface3 SPI Pen Input";
+ input->phys = "input/ts";
+ input->id.bustype = BUS_SPI;
+ input->id.vendor = 0x045e; /* Microsoft */
+ input->id.product = 0x0002;
+ input->id.version = 0x0000;
+
+ error = input_register_device(input);
+ if (error) {
+ dev_err(&data->spi->dev,
+ "Failed to register input device: %d", error);
+ return error;
+ }
+
+ return 0;
+}
+
static int surface3_spi_probe(struct spi_device *spi)
{
struct surface3_ts_data *data;
@@ -255,6 +353,10 @@ static int surface3_spi_probe(struct spi_device *spi)
if (error)
return error;
+ error = surface3_spi_create_pen_input(data);
+ if (error)
+ return error;
+
error = devm_request_threaded_irq(&spi->dev, spi->irq,
NULL, surface3_spi_irq_handler,
IRQF_ONESHOT,
--
2.8.2
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