[PATCH AUTOSEL 6.1 47/52] Input: imagis - add touch key support

Sasha Levin
2024-03-29T12:47:26Z

From: Duje Mihanović <duje.mihanovic@skole.hr>

[ Upstream commit 2d77f70bb7180060072b9c2406d67e4b3872af15 ]

IST3032C (and possibly some other models) has touch keys. Add support
for them to the imagis driver.

Signed-off-by: Duje Mihanović <duje.mihanovic@skole.hr>
Link: https://lore.kernel.org/r/20240306-b4-imagis-keys-v3-3-2c429afa8420@skole.hr
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/input/touchscreen/imagis.c | 30 +++++++++++++++++++++++++++++-
1 file changed, 29 insertions(+), 1 deletion(-)

diff --git a/drivers/input/touchscreen/imagis.c b/drivers/input/touchscreen/imagis.c
index fecda5cdc482b..fff13114775e0 100644
--- a/drivers/input/touchscreen/imagis.c
+++ b/drivers/input/touchscreen/imagis.c
@@ -34,6 +34,7 @@
#define IST3038C_AREA_MASK GENMASK(27, 24)
#define IST3038C_FINGER_COUNT_MASK GENMASK(15, 12)
#define IST3038C_FINGER_STATUS_MASK GENMASK(9, 0)
+#define IST3032C_KEY_STATUS_MASK GENMASK(20, 16)

struct imagis_properties {
unsigned int interrupt_msg_cmd;
@@ -41,6 +42,7 @@ struct imagis_properties {
unsigned int whoami_cmd;
unsigned int whoami_val;
bool protocol_b;
+ bool touch_keys_supported;
};

struct imagis_ts {
@@ -49,6 +51,8 @@ struct imagis_ts {
struct input_dev *input_dev;
struct touchscreen_properties prop;
struct regulator_bulk_data supplies[2];
+ u32 keycodes[5];
+ int num_keycodes;
};

static int imagis_i2c_read_reg(struct imagis_ts *ts,
@@ -93,7 +97,7 @@ static irqreturn_t imagis_interrupt(int irq, void *dev_id)
{
struct imagis_ts *ts = dev_id;
u32 intr_message, finger_status;
- unsigned int finger_count, finger_pressed;
+ unsigned int finger_count, finger_pressed, key_pressed;
int i;
int error;

@@ -140,6 +144,12 @@ static irqreturn_t imagis_interrupt(int irq, void *dev_id)
FIELD_GET(IST3038C_AREA_MASK, finger_status));
}

+ key_pressed = FIELD_GET(IST3032C_KEY_STATUS_MASK, intr_message);
+
+ for (int i = 0; i < ts->num_keycodes; i++)
+ input_report_key(ts->input_dev, ts->keycodes[i],
+ key_pressed & BIT(i));
+
input_mt_sync_frame(ts->input_dev);
input_sync(ts->input_dev);

@@ -225,6 +235,23 @@ static int imagis_init_input_dev(struct imagis_ts *ts)
input_set_capability(input_dev, EV_ABS, ABS_MT_POSITION_X);
input_set_capability(input_dev, EV_ABS, ABS_MT_POSITION_Y);
input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0, 16, 0, 0);
+ if (ts->tdata->touch_keys_supported) {
+ ts->num_keycodes = of_property_read_variable_u32_array(
+ ts->client->dev.of_node, "linux,keycodes",
+ ts->keycodes, 0, ARRAY_SIZE(ts->keycodes));
+ if (ts->num_keycodes <= 0) {
+ ts->keycodes[0] = KEY_APPSELECT;
+ ts->keycodes[1] = KEY_BACK;
+ ts->num_keycodes = 2;
+ }
+
+ input_dev->keycodemax = ts->num_keycodes;
+ input_dev->keycodesize = sizeof(ts->keycodes[0]);
+ input_dev->keycode = ts->keycodes;
+ }
+
+ for (int i = 0; i < ts->num_keycodes; i++)
+ input_set_capability(input_dev, EV_KEY, ts->keycodes[i]);

touchscreen_parse_properties(input_dev, true, &ts->prop);
if (!ts->prop.max_x || !ts->prop.max_y) {
@@ -366,6 +393,7 @@ static const struct imagis_properties imagis_3032c_data = {
.touch_coord_cmd = IST3038C_REG_TOUCH_COORD,
.whoami_cmd = IST3038C_REG_CHIPID,
.whoami_val = IST3032C_WHOAMI,
+ .touch_keys_supported = true,
};

static const struct imagis_properties imagis_3038b_data = {
--
2.43.0