Some devices with a goodix touchscreen have more then 1 capacitive
touch-key. This commit replaces the current support for a single
touch-key, which ignored the reported key-code. With support for
up to 7 touch-keys, based upon checking the key-code which is
post-fixed to any reported touch-data.
KEY_LEFTMETA is assigned to the first touch-key (it will still be
the default keycode for devices with a single touch-key).
KEY_F1, KEY_F2... are assigned as default keycode for the other
touch-keys.
This commit also add supports for keycode remapping, so that
systemd-udev's hwdb can be used to remap the codes to send
keycodes to match the icons on the buttons for devices with more
then 1 touch-key.
Signed-off-by: Dmitry Mastykin <dmastykin@xxxxxxxxxxxxx>
---
Changes in v2:
- Improve commit message
---
drivers/input/touchscreen/goodix.c | 54 ++++++++++++++++++++++++------
1 file changed, 44 insertions(+), 10 deletions(-)
diff --git a/drivers/input/touchscreen/goodix.c b/drivers/input/touchscreen/goodix.c
index adb9b92..daf1781 100644
--- a/drivers/input/touchscreen/goodix.c
+++ b/drivers/input/touchscreen/goodix.c
@@ -38,6 +38,7 @@
#define GOODIX_CONTACT_SIZE 8
#define GOODIX_MAX_CONTACT_SIZE 9
#define GOODIX_MAX_CONTACTS 10
+#define GOODIX_MAX_KEYS 7
#define GOODIX_CONFIG_MIN_LENGTH 186
#define GOODIX_CONFIG_911_LENGTH 186
@@ -55,6 +56,7 @@
#define GOODIX_REG_ID 0x8140
#define GOODIX_BUFFER_STATUS_READY BIT(7)
+#define GOODIX_HAVE_KEY BIT(4)
#define GOODIX_BUFFER_STATUS_TIMEOUT 20
#define RESOLUTION_LOC 1
@@ -100,6 +102,7 @@ struct goodix_ts_data {
enum goodix_irq_pin_access_method irq_pin_access_method;
unsigned int contact_size;
u8 config[GOODIX_CONFIG_MAX_LENGTH];
+ unsigned short keymap[GOODIX_MAX_KEYS];
};
static int goodix_check_cfg_8(struct goodix_ts_data *ts,
@@ -285,8 +288,14 @@ static int goodix_ts_read_input_report(struct goodix_ts_data *ts, u8 *data)
*/
max_timeout = jiffies + msecs_to_jiffies(GOODIX_BUFFER_STATUS_TIMEOUT);
do {
+ /*
+ * We are going to read ts->contact_size * max(1, touch_num) + 2
+ * bytes, where + 2 consists of reading 1 extra byte for the
+ * header + 1 extra byte for the footer which contains the
+ * touch-key code.
+ */
error = goodix_i2c_read(ts->client, GOODIX_READ_COOR_ADDR,
- data, ts->contact_size + 1);
+ data, ts->contact_size + 2);
if (error) {
dev_err(&ts->client->dev, "I2C transfer error: %d\n",
error);
@@ -299,10 +308,10 @@ static int goodix_ts_read_input_report(struct goodix_ts_data *ts, u8 *data)
return -EPROTO;
if (touch_num > 1) {
- data += 1 + ts->contact_size;
+ data += 2 + ts->contact_size;
error = goodix_i2c_read(ts->client,
GOODIX_READ_COOR_ADDR +
- 1 + ts->contact_size,
+ 2 + ts->contact_size,
data,
ts->contact_size *
(touch_num - 1));
@@ -353,6 +362,23 @@ static void goodix_ts_report_touch_9b(struct goodix_ts_data *ts, u8 *coor_data)
input_report_abs(ts->input_dev, ABS_MT_WIDTH_MAJOR, input_w);
}
+static void goodix_ts_report_key(struct goodix_ts_data *ts, u8 *data)
+{
+ int touch_num;
+ u8 key_value;
+ int i;
+
+ if (data[0] & GOODIX_HAVE_KEY) {
+ touch_num = data[0] & 0x0f;
+ key_value = data[1 + ts->contact_size * touch_num];
+ for (i = 0; i < GOODIX_MAX_KEYS; ++i)
+ if (key_value & (1 << i))
+ input_report_key(ts->input_dev, ts->keymap[i], 1);
+ } else
+ for (i = 0; i < GOODIX_MAX_KEYS; ++i)
+ input_report_key(ts->input_dev, ts->keymap[i], 0);
+}
+
/**
* goodix_process_events - Process incoming events
*
@@ -363,7 +389,7 @@ static void goodix_ts_report_touch_9b(struct goodix_ts_data *ts, u8 *coor_data)
*/
static void goodix_process_events(struct goodix_ts_data *ts)
{
- u8 point_data[1 + GOODIX_MAX_CONTACT_SIZE * GOODIX_MAX_CONTACTS];
+ u8 point_data[2 + GOODIX_MAX_CONTACT_SIZE * GOODIX_MAX_CONTACTS];
int touch_num;
int i;
@@ -371,11 +397,7 @@ static void goodix_process_events(struct goodix_ts_data *ts)
if (touch_num < 0)
return;
- /*
- * Bit 4 of the first byte reports the status of the capacitive
- * Windows/Home button.
- */
- input_report_key(ts->input_dev, KEY_LEFTMETA, point_data[0] & BIT(4));
+ goodix_ts_report_key(ts, point_data);
for (i = 0; i < touch_num; i++)
if (ts->contact_size == 9)
@@ -961,6 +983,7 @@ static int goodix_i2c_test(struct i2c_client *client)
static int goodix_configure_dev(struct goodix_ts_data *ts)
{
int error;
+ int i;
ts->int_trigger_type = GOODIX_INT_TRIGGER;
ts->max_touch_num = GOODIX_MAX_CONTACTS;
@@ -978,8 +1001,19 @@ static int goodix_configure_dev(struct goodix_ts_data *ts)
ts->input_dev->id.product = ts->id;
ts->input_dev->id.version = ts->version;
+ ts->input_dev->keycode = ts->keymap;
+ ts->input_dev->keycodesize = sizeof(ts->keymap[0]);
+ ts->input_dev->keycodemax = GOODIX_MAX_KEYS;
+
/* Capacitive Windows/Home button on some devices */
- input_set_capability(ts->input_dev, EV_KEY, KEY_LEFTMETA);
+ for (i = 0; i < GOODIX_MAX_KEYS; ++i) {
+ if (i == 0)
+ ts->keymap[i] = KEY_LEFTMETA;
+ else
+ ts->keymap[i] = KEY_F1 + (i - 1);
+
+ input_set_capability(ts->input_dev, EV_KEY, ts->keymap[i]);
+ }
input_set_capability(ts->input_dev, EV_ABS, ABS_MT_POSITION_X);
input_set_capability(ts->input_dev, EV_ABS, ABS_MT_POSITION_Y);
--
2.23.0
