Add support for querying the physical size from the touchpad for rushmore
and v7 touchpads, and use that to tell userspace the device resolution.
Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
---
drivers/input/mouse/alps.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++
drivers/input/mouse/alps.h | 2 ++
2 files changed, 50 insertions(+)
diff --git a/drivers/input/mouse/alps.c b/drivers/input/mouse/alps.c
index ac9fdbd..1531387 100644
--- a/drivers/input/mouse/alps.c
+++ b/drivers/input/mouse/alps.c
@@ -1783,6 +1783,45 @@ error:
return -1;
}
+static int alps_get_v3_v7_resolution(struct psmouse *psmouse, int reg_pitch)
+{
+ int reg, x_pitch, y_pitch, x_electrode, y_electrode, x_phys, y_phys;
+ struct alps_data *priv = psmouse->private;
+
+ reg = alps_command_mode_read_reg(psmouse, reg_pitch);
+ if (reg < 0)
+ return reg;
+
+ x_pitch = (char)(reg << 4) >> 4; /* sign extend lower 4 bits */
+ x_pitch = 50 + 2 * x_pitch; /* In 0.1 mm units */
+
+ y_pitch = (char)reg >> 4; /* sign extend upper 4 bits */
+ y_pitch = 36 + 2 * y_pitch; /* In 0.1 mm units */
+
+ reg = alps_command_mode_read_reg(psmouse, reg_pitch + 1);
+ if (reg < 0)
+ return reg;
+
+ x_electrode = (char)(reg << 4) >> 4; /* sign extend lower 4 bits */
+ x_electrode = 17 + x_electrode;
+
+ y_electrode = (char)reg >> 4; /* sign extend upper 4 bits */
+ y_electrode = 13 + y_electrode;
+
+ x_phys = x_pitch * (x_electrode - 1); /* In 0.1 mm units */
+ y_phys = y_pitch * (y_electrode - 1); /* In 0.1 mm units */
+
+ priv->x_res = priv->x_max * 10 / x_phys; /* units / mm */
+ priv->y_res = priv->y_max * 10 / y_phys; /* units / mm */
+
+ psmouse_info(psmouse,
+ "alps: pitch %dx%d num-electrodes %dx%d physical size %dx%d mm res %dx%d\n",
+ x_pitch, y_pitch, x_electrode, y_electrode,
+ x_phys / 10, y_phys / 10, priv->x_res, priv->y_res);
+
+ return 0;
+}
+
static int alps_hw_init_rushmore_v3(struct psmouse *psmouse)
{
struct alps_data *priv = psmouse->private;
@@ -1803,6 +1842,9 @@ static int alps_hw_init_rushmore_v3(struct psmouse *psmouse)
alps_command_mode_write_reg(psmouse, 0xc2cb, 0x00))
goto error;
+ if (alps_get_v3_v7_resolution(psmouse, 0xc2da))
+ goto error;
+
reg_val = alps_command_mode_read_reg(psmouse, 0xc2c6);
if (reg_val == -1)
goto error;
@@ -1988,6 +2030,9 @@ static int alps_hw_init_v7(struct psmouse *psmouse)
alps_command_mode_read_reg(psmouse, 0xc2d9) == -1)
goto error;
+ if (alps_get_v3_v7_resolution(psmouse, 0xc397))
+ goto error;
+
if (alps_command_mode_write_reg(psmouse, 0xc2c9, 0x64))
goto error;
@@ -2221,6 +2266,9 @@ static void alps_set_abs_params_mt(struct alps_data *priv,
input_set_abs_params(dev1, ABS_MT_POSITION_X, 0, priv->x_max, 0, 0);
input_set_abs_params(dev1, ABS_MT_POSITION_Y, 0, priv->y_max, 0, 0);
+ input_abs_set_res(dev1, ABS_MT_POSITION_X, priv->x_res);
+ input_abs_set_res(dev1, ABS_MT_POSITION_Y, priv->y_res);
+
input_mt_init_slots(dev1, MAX_TOUCHES, INPUT_MT_POINTER |
INPUT_MT_DROP_UNUSED | INPUT_MT_TRACK | INPUT_MT_SEMI_MT);
diff --git a/drivers/input/mouse/alps.h b/drivers/input/mouse/alps.h
index a98ac9b..66240b4 100644
--- a/drivers/input/mouse/alps.h
+++ b/drivers/input/mouse/alps.h
@@ -174,6 +174,8 @@ struct alps_data {
int y_max;
int x_bits;
int y_bits;
+ unsigned int x_res;
+ unsigned int y_res;
int (*hw_init)(struct psmouse *psmouse);
void (*process_packet)(struct psmouse *psmouse);
--
2.0.1
--
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