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Old 09-13-2012, 06:00 PM
 
Default Input: elantech - add resolution query support for v4 hardware

From: JJ Ding <jj_ding@emc.com.tw>

BugLink: http://bugs.launchpad.net/bugs/1033568

Prereq for commit e3dde4f

It turns out that v4's firmware provides a command so we can query
the resolution. Let's use it.

Signed-off-by: JJ Ding <jj_ding@emc.com.tw>
Reviewed-by: Daniel Kurtz <djkurtz@chromium.org>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
(cherry picked from commit 3d95fd6ad8d3cf582a70ed65660017114b6e4065)

Signed-off-by: Joseph Salisbury <joseph.salisbury@canonical.com>
---
drivers/input/mouse/elantech.c | 37 +++++++++++++++++++++++++++++++++++++
drivers/input/mouse/elantech.h | 1 +
2 files changed, 38 insertions(+)

diff --git a/drivers/input/mouse/elantech.c b/drivers/input/mouse/elantech.c
index 5e13643..7da63e5 100644
--- a/drivers/input/mouse/elantech.c
+++ b/drivers/input/mouse/elantech.c
@@ -931,6 +931,30 @@ static int elantech_set_range(struct psmouse *psmouse,
}

/*
+ * (value from firmware) * 10 + 790 = dpi
+ * we also have to convert dpi to dots/mm (*10/254 to avoid floating point)
+ */
+static unsigned int elantech_convert_res(unsigned int val)
+{
+ return (val * 10 + 790) * 10 / 254;
+}
+
+static int elantech_get_resolution_v4(struct psmouse *psmouse,
+ unsigned int *x_res,
+ unsigned int *y_res)
+{
+ unsigned char param[3];
+
+ if (elantech_send_cmd(psmouse, ETP_RESOLUTION_QUERY, param))
+ return -1;
+
+ *x_res = elantech_convert_res(param[1] & 0x0f);
+ *y_res = elantech_convert_res((param[1] & 0xf0) >> 4);
+
+ return 0;
+}
+
+/*
* Set the appropriate event bits for the input subsystem
*/
static int elantech_set_input_params(struct psmouse *psmouse)
@@ -938,6 +962,7 @@ static int elantech_set_input_params(struct psmouse *psmouse)
struct input_dev *dev = psmouse->dev;
struct elantech_data *etd = psmouse->private;
unsigned int x_min = 0, y_min = 0, x_max = 0, y_max = 0, width = 0;
+ unsigned int x_res = 0, y_res = 0;

if (elantech_set_range(psmouse, &x_min, &y_min, &x_max, &y_max, &width))
return -1;
@@ -985,10 +1010,20 @@ static int elantech_set_input_params(struct psmouse *psmouse)
break;

case 4:
+ if (elantech_get_resolution_v4(psmouse, &x_res, &y_res)) {
+ /*
+ * if query failed, print a warning and leave the values
+ * zero to resemble synaptics.c behavior.
+ */
+ psmouse_warn(psmouse, "couldn't query resolution data.
");
+ }
+
__set_bit(BTN_TOOL_QUADTAP, dev->keybit);
/* For X to recognize me as touchpad. */
input_set_abs_params(dev, ABS_X, x_min, x_max, 0, 0);
input_set_abs_params(dev, ABS_Y, y_min, y_max, 0, 0);
+ input_abs_set_res(dev, ABS_X, x_res);
+ input_abs_set_res(dev, ABS_Y, y_res);
/*
* range of pressure and width is the same as v2,
* report ABS_PRESSURE, ABS_TOOL_WIDTH for compatibility.
@@ -1001,6 +1036,8 @@ static int elantech_set_input_params(struct psmouse *psmouse)
input_mt_init_slots(dev, ETP_MAX_FINGERS);
input_set_abs_params(dev, ABS_MT_POSITION_X, x_min, x_max, 0, 0);
input_set_abs_params(dev, ABS_MT_POSITION_Y, y_min, y_max, 0, 0);
+ input_abs_set_res(dev, ABS_MT_POSITION_X, x_res);
+ input_abs_set_res(dev, ABS_MT_POSITION_Y, y_res);
input_set_abs_params(dev, ABS_MT_PRESSURE, ETP_PMIN_V2,
ETP_PMAX_V2, 0, 0);
/*
diff --git a/drivers/input/mouse/elantech.h b/drivers/input/mouse/elantech.h
index 08d00bd..46db3be 100644
--- a/drivers/input/mouse/elantech.h
+++ b/drivers/input/mouse/elantech.h
@@ -20,6 +20,7 @@
#define ETP_FW_VERSION_QUERY 0x01
#define ETP_CAPABILITIES_QUERY 0x02
#define ETP_SAMPLE_QUERY 0x03
+#define ETP_RESOLUTION_QUERY 0x04

/*
* Command values for register reading or writing
--
1.7.9.5


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