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authorMarek Vasut <marex@denx.de>2019-02-07 09:01:07 +0300
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2019-02-07 09:18:12 +0300
commite3559442afd2a3d9b09eedc236f19698c515472e (patch)
tree320b37ae0b41440ddc3b0819daca14b3ab8f62d3 /drivers/input/touchscreen/ili210x.c
parent1bdec5d9818c47e080c19784dfd25d1d9c20807e (diff)
downloadlinux-e3559442afd2a3d9b09eedc236f19698c515472e.tar.xz
Input: ili210x - rework the touchscreen sample processing
Get rid of the packed structures for representing data as that does not apply to other similar Ilitek touchscreens. Instead, implement a function which parses the data and reports touch events and coordinates. Signed-off-by: Marek Vasut <marex@denx.de> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Diffstat (limited to 'drivers/input/touchscreen/ili210x.c')
-rw-r--r--drivers/input/touchscreen/ili210x.c55
1 files changed, 30 insertions, 25 deletions
diff --git a/drivers/input/touchscreen/ili210x.c b/drivers/input/touchscreen/ili210x.c
index bc674ece61f3..c345d6df783f 100644
--- a/drivers/input/touchscreen/ili210x.c
+++ b/drivers/input/touchscreen/ili210x.c
@@ -7,6 +7,7 @@
#include <linux/delay.h>
#include <linux/workqueue.h>
#include <linux/gpio/consumer.h>
+#include <asm/unaligned.h>
#define MAX_TOUCHES 2
#define DEFAULT_POLL_PERIOD 20
@@ -17,20 +18,11 @@
#define REG_FIRMWARE_VERSION 0x40
#define REG_CALIBRATE 0xcc
-struct finger {
+struct panel_info {
u8 x_low;
u8 x_high;
u8 y_low;
u8 y_high;
-} __packed;
-
-struct touchdata {
- u8 status;
- struct finger finger[MAX_TOUCHES];
-} __packed;
-
-struct panel_info {
- struct finger finger_max;
u8 xchannel_num;
u8 ychannel_num;
} __packed;
@@ -75,25 +67,35 @@ static int ili210x_read_reg(struct i2c_client *client, u8 reg, void *buf,
return 0;
}
-static void ili210x_report_events(struct input_dev *input,
- const struct touchdata *touchdata)
+static bool ili210x_touchdata_to_coords(struct ili210x *priv, u8 *touchdata,
+ unsigned int finger,
+ unsigned int *x, unsigned int *y)
+{
+ if (finger >= MAX_TOUCHES)
+ return false;
+
+ if (touchdata[0] & BIT(finger))
+ return false;
+
+ *x = get_unaligned_be16(touchdata + 1 + (finger * 4) + 0);
+ *y = get_unaligned_be16(touchdata + 1 + (finger * 4) + 2);
+
+ return true;
+}
+
+static bool ili210x_report_events(struct ili210x *priv, u8 *touchdata)
{
+ struct input_dev *input = priv->input;
int i;
bool touch;
unsigned int x, y;
- const struct finger *finger;
for (i = 0; i < MAX_TOUCHES; i++) {
input_mt_slot(input, i);
- finger = &touchdata->finger[i];
-
- touch = touchdata->status & (1 << i);
+ touch = ili210x_touchdata_to_coords(priv, touchdata, i, &x, &y);
input_mt_report_slot_state(input, MT_TOOL_FINGER, touch);
if (touch) {
- x = finger->x_low | (finger->x_high << 8);
- y = finger->y_low | (finger->y_high << 8);
-
input_report_abs(input, ABS_MT_POSITION_X, x);
input_report_abs(input, ABS_MT_POSITION_Y, y);
}
@@ -101,6 +103,8 @@ static void ili210x_report_events(struct input_dev *input,
input_mt_report_pointer_emulation(input, false);
input_sync(input);
+
+ return touchdata[0] & 0xf3;
}
static void ili210x_work(struct work_struct *work)
@@ -108,20 +112,21 @@ static void ili210x_work(struct work_struct *work)
struct ili210x *priv = container_of(work, struct ili210x,
dwork.work);
struct i2c_client *client = priv->client;
- struct touchdata touchdata;
+ u8 touchdata[1 + 4 * MAX_TOUCHES];
+ bool touch;
int error;
error = ili210x_read_reg(client, REG_TOUCHDATA,
- &touchdata, sizeof(touchdata));
+ touchdata, sizeof(touchdata));
if (error) {
dev_err(&client->dev,
"Unable to get touchdata, err = %d\n", error);
return;
}
- ili210x_report_events(priv->input, &touchdata);
+ touch = ili210x_report_events(priv, touchdata);
- if (touchdata.status & 0xf3)
+ if (touch)
schedule_delayed_work(&priv->dwork,
msecs_to_jiffies(priv->poll_period));
}
@@ -235,8 +240,8 @@ static int ili210x_i2c_probe(struct i2c_client *client,
return error;
}
- xmax = panel.finger_max.x_low | (panel.finger_max.x_high << 8);
- ymax = panel.finger_max.y_low | (panel.finger_max.y_high << 8);
+ xmax = panel.x_low | (panel.x_high << 8);
+ ymax = panel.y_low | (panel.y_high << 8);
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)