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Subject[PATCH 2/3] Input: ektf2127 - Add support for eKTF2132 touchscreen
Date
The eKTF2132 is a touchscreen controller found, for example, in the Kobo
Aura ebook reader. It is similar to the ektf2127, but it uses a different
packet type to report touch events.

Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
---
drivers/input/touchscreen/ektf2127.c | 32 +++++++++++++++++++++++++++-
1 file changed, 31 insertions(+), 1 deletion(-)

diff --git a/drivers/input/touchscreen/ektf2127.c b/drivers/input/touchscreen/ektf2127.c
index eadd389cf81fe..491de67ddbcd7 100644
--- a/drivers/input/touchscreen/ektf2127.c
+++ b/drivers/input/touchscreen/ektf2127.c
@@ -28,6 +28,7 @@
#define EKTF2127_RESPONSE 0x52
#define EKTF2127_REQUEST 0x53
#define EKTF2127_HELLO 0x55
+#define EKTF2127_REPORT2 0x5a
#define EKTF2127_REPORT 0x5d
#define EKTF2127_CALIB_DONE 0x66

@@ -95,6 +96,29 @@ static void ektf2127_report_event(struct ektf2127_ts *ts, const u8 *buf)
input_sync(ts->input);
}

+static void ektf2127_report2_contact(struct ektf2127_ts *ts, int slot,
+ const u8 *buf, bool active)
+{
+ input_mt_slot(ts->input, slot);
+ input_mt_report_slot_state(ts->input, MT_TOOL_FINGER, active);
+
+ if (active) {
+ int x = (buf[0] & 0xf0) << 4 | buf[1];
+ int y = (buf[0] & 0x0f) << 8 | buf[2];
+
+ touchscreen_report_pos(ts->input, &ts->prop, x, y, true);
+ }
+}
+
+static void ektf2127_report2_event(struct ektf2127_ts *ts, const u8 *buf)
+{
+ ektf2127_report2_contact(ts, 0, &buf[1], !!(buf[7] & 2));
+ ektf2127_report2_contact(ts, 1, &buf[4], !!(buf[7] & 4));
+
+ input_mt_sync_frame(ts->input);
+ input_sync(ts->input);
+}
+
static irqreturn_t ektf2127_irq(int irq, void *dev_id)
{
struct ektf2127_ts *ts = dev_id;
@@ -113,6 +137,10 @@ static irqreturn_t ektf2127_irq(int irq, void *dev_id)
ektf2127_report_event(ts, buf);
break;

+ case EKTF2127_REPORT2:
+ ektf2127_report2_event(ts, buf);
+ break;
+
case EKTF2127_NOISE:
if (buf[1] == EKTF2127_ENV_NOISY)
dev_dbg(dev, "Environment is electrically noisy\n");
@@ -305,6 +333,7 @@ static int ektf2127_probe(struct i2c_client *client,
#ifdef CONFIG_OF
static const struct of_device_id ektf2127_of_match[] = {
{ .compatible = "elan,ektf2127" },
+ { .compatible = "elan,ektf2132" },
{}
};
MODULE_DEVICE_TABLE(of, ektf2127_of_match);
@@ -312,6 +341,7 @@ MODULE_DEVICE_TABLE(of, ektf2127_of_match);

static const struct i2c_device_id ektf2127_i2c_id[] = {
{ "ektf2127", 0 },
+ { "ektf2132", 0 },
{}
};
MODULE_DEVICE_TABLE(i2c, ektf2127_i2c_id);
@@ -327,6 +357,6 @@ static struct i2c_driver ektf2127_driver = {
};
module_i2c_driver(ektf2127_driver);

-MODULE_DESCRIPTION("ELAN eKTF2127 I2C Touchscreen Driver");
+MODULE_DESCRIPTION("ELAN eKTF2127/eKTF2132 I2C Touchscreen Driver");
MODULE_AUTHOR("Michel Verlaan, Siebren Vroegindeweij");
MODULE_LICENSE("GPL");
--
2.28.0
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