[PATCH v2 3/3] input/touchscreen: imagis: Add supports for Imagis IST3038

[Raymond Hackley <raymondhackley@protonmail.com>]

Imagis IST3038 is another variant of Imagis IST3038 IC, which has
a different register interface from IST3038C (possibly firmware defined).

Unlike IST3038C/IST3032C, IST3038 has different registers for commands,
which means IST3038 doesn't use protocol B.
Similar to IST3032C and maybe the other variants, IST3038 has touch keys
support, which provides KEY_APPSELECT and KEY_BACK.

Add support for IST3038 with touch keys.

Signed-off-by: Raymond Hackley <raymondhackley@protonmail.com>
---
 drivers/input/touchscreen/imagis.c | 24 ++++++++++++++++++++----
 1 file changed, 20 insertions(+), 4 deletions(-)

diff --git a/drivers/input/touchscreen/imagis.c b/drivers/input/touchscreen/imagis.c
index 886bcfc8497a..aeabf8d057de 100644
--- a/drivers/input/touchscreen/imagis.c
+++ b/drivers/input/touchscreen/imagis.c
@@ -12,9 +12,17 @@
 #include <linux/property.h>
 #include <linux/regulator/consumer.h>
 
+#define IST30XX_REG_STATUS		0x20
+#define IST30XX_REG_CHIPID		(0x40000000 | IST3038C_DIRECT_ACCESS)
+
+#define IST30XX_WHOAMI			0x30003000
+#define IST30XXA_WHOAMI			0x300a300a
+#define IST30XXB_WHOAMI			0x300b300b
+#define IST3038_WHOAMI			0x30383038
+
 #define IST3032C_WHOAMI			0x32c
+#define IST3038C_WHOAMI			0x38c
 
-#define IST3038B_REG_STATUS		0x20
 #define IST3038B_REG_CHIPID		0x30
 #define IST3038B_WHOAMI			0x30380b
 
@@ -25,7 +33,6 @@
 #define IST3038C_REG_TOUCH_STATUS	(IST3038C_REG_HIB_BASE | IST3038C_HIB_ACCESS)
 #define IST3038C_REG_TOUCH_COORD	(IST3038C_REG_HIB_BASE | IST3038C_HIB_ACCESS | 0x8)
 #define IST3038C_REG_INTR_MESSAGE	(IST3038C_REG_HIB_BASE | IST3038C_HIB_ACCESS | 0x4)
-#define IST3038C_WHOAMI			0x38c
 #define IST3038C_CHIP_ON_DELAY_MS	60
 #define IST3038C_I2C_RETRY_COUNT	3
 #define IST3038C_MAX_FINGER_NUM		10
@@ -397,9 +404,17 @@ static const struct imagis_properties imagis_3032c_data = {
 	.protocol_b = true,
 };
 
+static const struct imagis_properties imagis_3038_data = {
+	.interrupt_msg_cmd = IST30XX_REG_STATUS,
+	.touch_coord_cmd = IST30XX_REG_STATUS,
+	.whoami_cmd = IST30XX_REG_CHIPID,
+	.whoami_val = IST3038_WHOAMI,
+	.touch_keys_supported = true,
+};
+
 static const struct imagis_properties imagis_3038b_data = {
-	.interrupt_msg_cmd = IST3038B_REG_STATUS,
-	.touch_coord_cmd = IST3038B_REG_STATUS,
+	.interrupt_msg_cmd = IST30XX_REG_STATUS,
+	.touch_coord_cmd = IST30XX_REG_STATUS,
 	.whoami_cmd = IST3038B_REG_CHIPID,
 	.whoami_val = IST3038B_WHOAMI,
 };
@@ -415,6 +430,7 @@ static const struct imagis_properties imagis_3038c_data = {
 #ifdef CONFIG_OF
 static const struct of_device_id imagis_of_match[] = {
 	{ .compatible = "imagis,ist3032c", .data = &imagis_3032c_data },
+	{ .compatible = "imagis,ist3038", .data = &imagis_3038_data },
 	{ .compatible = "imagis,ist3038b", .data = &imagis_3038b_data },
 	{ .compatible = "imagis,ist3038c", .data = &imagis_3038c_data },
 	{ },
-- 
2.39.2