[PATCH v5 00/10] input: elants: Support Asus TF300T touchscreen

[PATCH v5 00/10] input: elants: Support Asus TF300T touchscreen

[Michał Mirosław]

This series cleans up the driver a bit and implements changes needed to
support EKTF3624-based touchscreen used in Asus TF300T and similar
Tegra3-based tablets.

---
v2: extended with Dmitry's patches (replaced v1 patches 3 and 4)
v3: rebased for v5.7-rc1
v4: rebased onto v5.7-rc2+ (current Linus' master)
    update "remove unused axes" and "refactor
      elants_i2c_execute_command()" patches after review
    add David's patch converting DT binding to YAML
v5: rebased onto dtor/input/for-linus

---

David Heidelberg (1):
  dt-bindings: input: touchscreen: elants_i2c: convert to YAML

Dmitry Osipenko (3):
  input: elants: support 0x66 reply opcode for reporting touches
  dt-bindings: input: elants-i2c: Document common touchscreen properties
  dt-bindings: input: elants-i2c: Document eKTF3624

Michał Mirosław (6):
  input: elants: document some registers and values
  input: elants: support old touch report format
  input: elants: remove unused axes
  input: elants: override touchscreen info with DT properties
  input: elants: refactor elants_i2c_execute_command()
  input: elants: read touchscreen size for EKTF3624

 .../devicetree/bindings/input/elants_i2c.txt  |  34 --
 .../input/touchscreen/elan,elants_i2c.yaml    |  69 ++++
 drivers/input/touchscreen/elants_i2c.c        | 380 +++++++++++-------
 3 files changed, 314 insertions(+), 169 deletions(-)
 delete mode 100644 Documentation/devicetree/bindings/input/elants_i2c.txt
 create mode 100644 Documentation/devicetree/bindings/input/touchscreen/elan,elants_i2c.yaml

-- 
2.20.1

[PATCH v5 02/10] input: elants: support old touch report format

[Michał Mirosław]

Support ELAN touchpad sensor with older firmware as found on eg. Asus
Transformer Pads.

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Reviewed-by: Dmitry Osipenko <digetx@gmail.com>
Tested-by: Dmitry Osipenko <digetx@gmail.com>
---
 drivers/input/touchscreen/elants_i2c.c | 36 ++++++++++++++++++--------
 1 file changed, 25 insertions(+), 11 deletions(-)

diff --git a/drivers/input/touchscreen/elants_i2c.c b/drivers/input/touchscreen/elants_i2c.c
index d2175fb6209a..6c2b336d92bf 100644
--- a/drivers/input/touchscreen/elants_i2c.c
+++ b/drivers/input/touchscreen/elants_i2c.c
@@ -68,6 +68,7 @@
 #define CMD_HEADER_REK		0x66
 
 /* FW position data */
+#define PACKET_SIZE_OLD		40
 #define PACKET_SIZE		55
 #define MAX_CONTACT_NUM		10
 #define FW_POS_HEADER		0
@@ -855,7 +856,8 @@ static int elants_i2c_fw_update(struct elants_data *ts)
  * Event reporting.
  */
 
-static void elants_i2c_mt_event(struct elants_data *ts, u8 *buf)
+static void elants_i2c_mt_event(struct elants_data *ts, u8 *buf,
+				size_t report_len)
 {
 	struct input_dev *input = ts->input;
 	unsigned int n_fingers;
@@ -868,7 +870,8 @@ static void elants_i2c_mt_event(struct elants_data *ts, u8 *buf)
 			buf[FW_POS_STATE];
 
 	dev_dbg(&ts->client->dev,
-		"n_fingers: %u, state: %04x\n",  n_fingers, finger_state);
+		"n_fingers: %u, state: %04x, report_len: %zu\n",
+		n_fingers, finger_state, report_len);
 
 	/* Note: all fingers have the same tool type */
 	tool_type = buf[FW_POS_TOOL_TYPE] & BIT(0) ?
@@ -882,8 +885,16 @@ static void elants_i2c_mt_event(struct elants_data *ts, u8 *buf)
 			pos = &buf[FW_POS_XY + i * 3];
 			x = (((u16)pos[0] & 0xf0) << 4) | pos[1];
 			y = (((u16)pos[0] & 0x0f) << 8) | pos[2];
-			p = buf[FW_POS_PRESSURE + i];
-			w = buf[FW_POS_WIDTH + i];
+			if (report_len == PACKET_SIZE_OLD) {
+				w = buf[FW_POS_WIDTH + i / 2];
+				w >>= 4 * (~i & 1);	// little-endian-nibbles
+				w |= w << 4;
+				w |= !w;
+				p = w;
+			} else {
+				p = buf[FW_POS_PRESSURE + i];
+				w = buf[FW_POS_WIDTH + i];
+			}
 
 			dev_dbg(&ts->client->dev, "i=%d x=%d y=%d p=%d w=%d\n",
 				i, x, y, p, w);
@@ -916,7 +927,8 @@ static u8 elants_i2c_calculate_checksum(u8 *buf)
 	return checksum;
 }
 
-static void elants_i2c_event(struct elants_data *ts, u8 *buf)
+static void elants_i2c_event(struct elants_data *ts, u8 *buf,
+			     size_t report_len)
 {
 	u8 checksum = elants_i2c_calculate_checksum(buf);
 
@@ -930,7 +942,7 @@ static void elants_i2c_event(struct elants_data *ts, u8 *buf)
 			 "%s: unknown packet type: %02x\n",
 			 __func__, buf[FW_POS_HEADER]);
 	else
-		elants_i2c_mt_event(ts, buf);
+		elants_i2c_mt_event(ts, buf, report_len);
 }
 
 static irqreturn_t elants_i2c_irq(int irq, void *_dev)
@@ -988,7 +1000,8 @@ static irqreturn_t elants_i2c_irq(int irq, void *_dev)
 			break;
 
 		case QUEUE_HEADER_SINGLE:
-			elants_i2c_event(ts, &ts->buf[HEADER_SIZE]);
+			elants_i2c_event(ts, &ts->buf[HEADER_SIZE],
+					 ts->buf[FW_HDR_LENGTH]);
 			break;
 
 		case QUEUE_HEADER_NORMAL:
@@ -1001,17 +1014,18 @@ static irqreturn_t elants_i2c_irq(int irq, void *_dev)
 			}
 
 			report_len = ts->buf[FW_HDR_LENGTH] / report_count;
-			if (report_len != PACKET_SIZE) {
+			if (report_len != PACKET_SIZE &&
+			    report_len != PACKET_SIZE_OLD) {
 				dev_err(&client->dev,
-					"mismatching report length: %*ph\n",
+					"unsupported report length: %*ph\n",
 					HEADER_SIZE, ts->buf);
 				break;
 			}
 
 			for (i = 0; i < report_count; i++) {
 				u8 *buf = ts->buf + HEADER_SIZE +
-							i * PACKET_SIZE;
-				elants_i2c_event(ts, buf);
+					  i * report_len;
+				elants_i2c_event(ts, buf, report_len);
 			}
 			break;
 
-- 
2.20.1

[PATCH v5 01/10] input: elants: document some registers and values

[Michał Mirosław]

Add information found in downstream kernels, to make the code less
magic.

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Reviewed-by: Dmitry Osipenko <digetx@gmail.com>
Tested-by: Dmitry Osipenko <digetx@gmail.com>
---
 drivers/input/touchscreen/elants_i2c.c | 29 +++++++++++++++++++++-----
 1 file changed, 24 insertions(+), 5 deletions(-)

diff --git a/drivers/input/touchscreen/elants_i2c.c b/drivers/input/touchscreen/elants_i2c.c
index 2289f9638116..d2175fb6209a 100644
--- a/drivers/input/touchscreen/elants_i2c.c
+++ b/drivers/input/touchscreen/elants_i2c.c
@@ -81,7 +81,11 @@
 
 #define HEADER_REPORT_10_FINGER	0x62
 
-/* Header (4 bytes) plus 3 fill 10-finger packets */
+/* Power state */
+#define PWR_STATE_DEEP_SLEEP	0
+#define PWR_STATE_NORMAL	1
+
+/* Header (4 bytes) plus 3 full 10-finger packets */
 #define MAX_PACKET_SIZE		169
 
 #define BOOT_TIME_DELAY_MS	50
@@ -91,10 +95,21 @@
 #define E_ELAN_INFO_BC_VER	0x10
 #define E_ELAN_INFO_TEST_VER	0xE0
 #define E_ELAN_INFO_FW_ID	0xF0
+#define E_POWER_MODE		0x40
+#define E_POWER_STATE		0x50
+#define E_INFO_X_RES		0x60
+#define E_INFO_Y_RES		0x63
 #define E_INFO_OSR		0xD6
 #define E_INFO_PHY_SCAN		0xD7
 #define E_INFO_PHY_DRIVER	0xD8
 
+/* FW write command, 0x54 0x?? 0x0, 0x01 */
+#define E_POWER_MODE_BATTERY	0x40
+#define E_POWER_MODE_AC		0x41
+#define E_POWER_MODE_USB	0x42
+#define E_POWER_STATE_SLEEP	0x50
+#define E_POWER_STATE_RESUME	0x58
+
 #define MAX_RETRIES		3
 #define MAX_FW_UPDATE_RETRIES	30
 
@@ -239,8 +254,8 @@ static int elants_i2c_calibrate(struct elants_data *ts)
 {
 	struct i2c_client *client = ts->client;
 	int ret, error;
-	static const u8 w_flashkey[] = { 0x54, 0xC0, 0xE1, 0x5A };
-	static const u8 rek[] = { 0x54, 0x29, 0x00, 0x01 };
+	static const u8 w_flashkey[] = { CMD_HEADER_WRITE, 0xC0, 0xE1, 0x5A };
+	static const u8 rek[] = { CMD_HEADER_WRITE, 0x29, 0x00, 0x01 };
 	static const u8 rek_resp[] = { CMD_HEADER_REK, 0x66, 0x66, 0x66 };
 
 	disable_irq(client->irq);
@@ -1366,7 +1381,9 @@ static int __maybe_unused elants_i2c_suspend(struct device *dev)
 {
 	struct i2c_client *client = to_i2c_client(dev);
 	struct elants_data *ts = i2c_get_clientdata(client);
-	const u8 set_sleep_cmd[] = { 0x54, 0x50, 0x00, 0x01 };
+	const u8 set_sleep_cmd[] = {
+		CMD_HEADER_WRITE, E_POWER_STATE_SLEEP, 0x00, 0x01
+	};
 	int retry_cnt;
 	int error;
 
@@ -1403,7 +1420,9 @@ static int __maybe_unused elants_i2c_resume(struct device *dev)
 {
 	struct i2c_client *client = to_i2c_client(dev);
 	struct elants_data *ts = i2c_get_clientdata(client);
-	const u8 set_active_cmd[] = { 0x54, 0x58, 0x00, 0x01 };
+	const u8 set_active_cmd[] = {
+		CMD_HEADER_WRITE, E_POWER_STATE_RESUME, 0x00, 0x01
+	};
 	int retry_cnt;
 	int error;
 
-- 
2.20.1

[PATCH v5 03/10] input: elants: remove unused axes

[Michał Mirosław]

Driver only ever reports MT events and input_mt_init_slots() sets up
emulated axes already.  Clear the capabilities not generated directly
and move MT axes setup, so they are visible by input_mt_init_slots().

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Reviewed-by: Dmitry Osipenko <digetx@gmail.com>
Tested-by: Dmitry Osipenko <digetx@gmail.com>
---
v4: reword commitmsg; reorder axis setup
---
 drivers/input/touchscreen/elants_i2c.c | 26 ++++++++------------------
 1 file changed, 8 insertions(+), 18 deletions(-)

diff --git a/drivers/input/touchscreen/elants_i2c.c b/drivers/input/touchscreen/elants_i2c.c
index 6c2b336d92bf..61a9098f35d2 100644
--- a/drivers/input/touchscreen/elants_i2c.c
+++ b/drivers/input/touchscreen/elants_i2c.c
@@ -1319,25 +1319,7 @@ static int elants_i2c_probe(struct i2c_client *client,
 	ts->input->name = "Elan Touchscreen";
 	ts->input->id.bustype = BUS_I2C;
 
-	__set_bit(BTN_TOUCH, ts->input->keybit);
-	__set_bit(EV_ABS, ts->input->evbit);
-	__set_bit(EV_KEY, ts->input->evbit);
-
-	/* Single touch input params setup */
-	input_set_abs_params(ts->input, ABS_X, 0, ts->x_max, 0, 0);
-	input_set_abs_params(ts->input, ABS_Y, 0, ts->y_max, 0, 0);
-	input_set_abs_params(ts->input, ABS_PRESSURE, 0, 255, 0, 0);
-	input_abs_set_res(ts->input, ABS_X, ts->x_res);
-	input_abs_set_res(ts->input, ABS_Y, ts->y_res);
-
 	/* Multitouch input params setup */
-	error = input_mt_init_slots(ts->input, MAX_CONTACT_NUM,
-				    INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
-	if (error) {
-		dev_err(&client->dev,
-			"failed to initialize MT slots: %d\n", error);
-		return error;
-	}
 
 	input_set_abs_params(ts->input, ABS_MT_POSITION_X, 0, ts->x_max, 0, 0);
 	input_set_abs_params(ts->input, ABS_MT_POSITION_Y, 0, ts->y_max, 0, 0);
@@ -1349,6 +1331,14 @@ static int elants_i2c_probe(struct i2c_client *client,
 	input_abs_set_res(ts->input, ABS_MT_POSITION_Y, ts->y_res);
 	input_abs_set_res(ts->input, ABS_MT_TOUCH_MAJOR, 1);
 
+	error = input_mt_init_slots(ts->input, MAX_CONTACT_NUM,
+				    INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
+	if (error) {
+		dev_err(&client->dev,
+			"failed to initialize MT slots: %d\n", error);
+		return error;
+	}
+
 	error = input_register_device(ts->input);
 	if (error) {
 		dev_err(&client->dev,
-- 
2.20.1

[PATCH v5 05/10] input: elants: refactor elants_i2c_execute_command()

[Michał Mirosław]

Apply some DRY-ing to elants_i2c_execute_command() callers.  This pulls
polling and error printk()s into a single function.

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
---
v4: return 0 on success; use %pe for error code
---
 drivers/input/touchscreen/elants_i2c.c | 189 +++++++++++++------------
 1 file changed, 96 insertions(+), 93 deletions(-)

diff --git a/drivers/input/touchscreen/elants_i2c.c b/drivers/input/touchscreen/elants_i2c.c
index d2be61ae6722..74ece2091c76 100644
--- a/drivers/input/touchscreen/elants_i2c.c
+++ b/drivers/input/touchscreen/elants_i2c.c
@@ -207,7 +207,8 @@ static int elants_i2c_read(struct i2c_client *client, void *data, size_t size)
 
 static int elants_i2c_execute_command(struct i2c_client *client,
 				      const u8 *cmd, size_t cmd_size,
-				      u8 *resp, size_t resp_size)
+				      u8 *resp, size_t resp_size,
+				      int retries, const char *cmd_name)
 {
 	struct i2c_msg msgs[2];
 	int ret;
@@ -227,30 +228,55 @@ static int elants_i2c_execute_command(struct i2c_client *client,
 		break;
 
 	default:
-		dev_err(&client->dev, "%s: invalid command %*ph\n",
-			__func__, (int)cmd_size, cmd);
+		dev_err(&client->dev, "(%s): invalid command: %*ph\n",
+			cmd_name, (int)cmd_size, cmd);
 		return -EINVAL;
 	}
 
-	msgs[0].addr = client->addr;
-	msgs[0].flags = client->flags & I2C_M_TEN;
-	msgs[0].len = cmd_size;
-	msgs[0].buf = (u8 *)cmd;
+	for (;;) {
+		msgs[0].addr = client->addr;
+		msgs[0].flags = client->flags & I2C_M_TEN;
+		msgs[0].len = cmd_size;
+		msgs[0].buf = (u8 *)cmd;
 
-	msgs[1].addr = client->addr;
-	msgs[1].flags = client->flags & I2C_M_TEN;
-	msgs[1].flags |= I2C_M_RD;
-	msgs[1].len = resp_size;
-	msgs[1].buf = resp;
+		msgs[1].addr = client->addr;
+		msgs[1].flags = client->flags & I2C_M_TEN;
+		msgs[1].flags |= I2C_M_RD;
+		msgs[1].len = resp_size;
+		msgs[1].buf = resp;
 
-	ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
-	if (ret < 0)
-		return ret;
+		ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
+		if (ret < 0) {
+			if (--retries > 0) {
+				dev_dbg(&client->dev,
+					"(%s) I2C transfer failed: %pe (retrying)\n",
+					cmd_name, ERR_PTR(ret));
+				continue;
+			}
 
-	if (ret != ARRAY_SIZE(msgs) || resp[FW_HDR_TYPE] != expected_response)
-		return -EIO;
+			dev_err(&client->dev,
+				"(%s) I2C transfer failed: %pe\n",
+				cmd_name, ERR_PTR(ret));
+			return ret;
+		}
 
-	return 0;
+		if (ret != ARRAY_SIZE(msgs) ||
+		    resp[FW_HDR_TYPE] != expected_response) {
+			if (--retries > 0) {
+				dev_dbg(&client->dev,
+					"(%s) unexpected response: %*ph (retrying)\n",
+					cmd_name, ret, resp);
+				continue;
+			}
+
+			dev_err(&client->dev,
+				"(%s) unexpected response: %*ph\n",
+				cmd_name, ret, resp);
+			return -EIO;
+		}
+
+		return 0;
+	}
 }
 
 static int elants_i2c_calibrate(struct elants_data *ts)
@@ -323,27 +349,21 @@ static u16 elants_i2c_parse_version(u8 *buf)
 static int elants_i2c_query_hw_version(struct elants_data *ts)
 {
 	struct i2c_client *client = ts->client;
-	int error, retry_cnt;
+	int retry_cnt = MAX_RETRIES;
 	const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_FW_ID, 0x00, 0x01 };
 	u8 resp[HEADER_SIZE];
+	int err;
 
-	for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) {
-		error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
-						   resp, sizeof(resp));
-		if (!error) {
-			ts->hw_version = elants_i2c_parse_version(resp);
-			if (ts->hw_version != 0xffff)
-				return 0;
-		}
+	while (retry_cnt--) {
+		err = elants_i2c_execute_command(client, cmd, sizeof(cmd),
+						 resp, sizeof(resp), 1,
+						 "read fw id");
+		if (err < 0)
+			return err;
 
-		dev_dbg(&client->dev, "read fw id error=%d, buf=%*phC\n",
-			error, (int)sizeof(resp), resp);
-	}
-
-	if (error) {
-		dev_err(&client->dev,
-			"Failed to read fw id: %d\n", error);
-		return error;
+		ts->hw_version = elants_i2c_parse_version(resp);
+		if (ts->hw_version != 0xffff)
+			return 0;
 	}
 
 	dev_err(&client->dev, "Invalid fw id: %#04x\n", ts->hw_version);
@@ -354,26 +374,27 @@ static int elants_i2c_query_hw_version(struct elants_data *ts)
 static int elants_i2c_query_fw_version(struct elants_data *ts)
 {
 	struct i2c_client *client = ts->client;
-	int error, retry_cnt;
+	int retry_cnt = MAX_RETRIES;
 	const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_FW_VER, 0x00, 0x01 };
 	u8 resp[HEADER_SIZE];
+	int err;
 
-	for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) {
-		error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
-						   resp, sizeof(resp));
-		if (!error) {
-			ts->fw_version = elants_i2c_parse_version(resp);
-			if (ts->fw_version != 0x0000 &&
-			    ts->fw_version != 0xffff)
-				return 0;
-		}
+	while (retry_cnt--) {
+		err = elants_i2c_execute_command(client, cmd, sizeof(cmd),
+						 resp, sizeof(resp), 1,
+						 "read fw version");
+		if (err < 0)
+			return err;
 
-		dev_dbg(&client->dev, "read fw version error=%d, buf=%*phC\n",
-			error, (int)sizeof(resp), resp);
+		ts->fw_version = elants_i2c_parse_version(resp);
+		if (ts->fw_version != 0x0000 && ts->fw_version != 0xffff)
+			return 0;
+
+		dev_dbg(&client->dev, "(read fw version) resp %*phC\n",
+			(int)sizeof(resp), resp);
 	}
 
-	dev_err(&client->dev,
-		"Failed to read fw version or fw version is invalid\n");
+	dev_err(&client->dev, "Invalid fw ver: %#04x\n", ts->fw_version);
 
 	return -EINVAL;
 }
@@ -381,25 +402,20 @@ static int elants_i2c_query_fw_version(struct elants_data *ts)
 static int elants_i2c_query_test_version(struct elants_data *ts)
 {
 	struct i2c_client *client = ts->client;
-	int error, retry_cnt;
+	int error;
 	u16 version;
 	const u8 cmd[] = { CMD_HEADER_READ, E_ELAN_INFO_TEST_VER, 0x00, 0x01 };
 	u8 resp[HEADER_SIZE];
 
-	for (retry_cnt = 0; retry_cnt < MAX_RETRIES; retry_cnt++) {
-		error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
-						   resp, sizeof(resp));
-		if (!error) {
-			version = elants_i2c_parse_version(resp);
-			ts->test_version = version >> 8;
-			ts->solution_version = version & 0xff;
+	error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
+					   resp, sizeof(resp), MAX_RETRIES,
+					   "read test version");
+	if (!error) {
+		version = elants_i2c_parse_version(resp);
+		ts->test_version = version >> 8;
+		ts->solution_version = version & 0xff;
 
-			return 0;
-		}
-
-		dev_dbg(&client->dev,
-			"read test version error rc=%d, buf=%*phC\n",
-			error, (int)sizeof(resp), resp);
+		return 0;
 	}
 
 	dev_err(&client->dev, "Failed to read test version\n");
@@ -416,13 +432,10 @@ static int elants_i2c_query_bc_version(struct elants_data *ts)
 	int error;
 
 	error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
-					   resp, sizeof(resp));
-	if (error) {
-		dev_err(&client->dev,
-			"read BC version error=%d, buf=%*phC\n",
-			error, (int)sizeof(resp), resp);
+					   resp, sizeof(resp), 1,
+					   "read BC version");
+	if (error)
 		return error;
-	}
 
 	version = elants_i2c_parse_version(resp);
 	ts->bc_version = version >> 8;
@@ -454,12 +467,10 @@ static int elants_i2c_query_ts_info(struct elants_data *ts)
 	error = elants_i2c_execute_command(client,
 					   get_resolution_cmd,
 					   sizeof(get_resolution_cmd),
-					   resp, sizeof(resp));
-	if (error) {
-		dev_err(&client->dev, "get resolution command failed: %d\n",
-			error);
+					   resp, sizeof(resp), 1,
+					   "get resolution");
+	if (error)
 		return error;
-	}
 
 	rows = resp[2] + resp[6] + resp[10];
 	cols = resp[3] + resp[7] + resp[11];
@@ -467,36 +478,29 @@ static int elants_i2c_query_ts_info(struct elants_data *ts)
 	/* Process mm_to_pixel information */
 	error = elants_i2c_execute_command(client,
 					   get_osr_cmd, sizeof(get_osr_cmd),
-					   resp, sizeof(resp));
-	if (error) {
-		dev_err(&client->dev, "get osr command failed: %d\n",
-			error);
+					   resp, sizeof(resp), 1, "get osr");
+	if (error)
 		return error;
-	}
 
 	osr = resp[3];
 
 	error = elants_i2c_execute_command(client,
 					   get_physical_scan_cmd,
 					   sizeof(get_physical_scan_cmd),
-					   resp, sizeof(resp));
-	if (error) {
-		dev_err(&client->dev, "get physical scan command failed: %d\n",
-			error);
+					   resp, sizeof(resp), 1,
+					   "get physical scan");
+	if (error)
 		return error;
-	}
 
 	phy_x = get_unaligned_be16(&resp[2]);
 
 	error = elants_i2c_execute_command(client,
 					   get_physical_drive_cmd,
 					   sizeof(get_physical_drive_cmd),
-					   resp, sizeof(resp));
-	if (error) {
-		dev_err(&client->dev, "get physical drive command failed: %d\n",
-			error);
+					   resp, sizeof(resp), 1,
+					   "get physical drive");
+	if (error)
 		return error;
-	}
 
 	phy_y = get_unaligned_be16(&resp[2]);
 
@@ -651,11 +655,10 @@ static int elants_i2c_validate_remark_id(struct elants_data *ts,
 
 	/* Compare TS Remark ID and FW Remark ID */
 	error = elants_i2c_execute_command(client, cmd, sizeof(cmd),
-					resp, sizeof(resp));
-	if (error) {
-		dev_err(&client->dev, "failed to query Remark ID: %d\n", error);
+					   resp, sizeof(resp),
+					   1, "read Remark ID");
+	if (error < 0)
 		return error;
-	}
 
 	ts_remark_id = get_unaligned_be16(&resp[3]);
 
-- 
2.20.1

[PATCH v5 04/10] input: elants: override touchscreen info with DT properties

[Michał Mirosław]

Allow overriding of information from hardware and support additional
common DT properties like axis inversion. This is required for eg.
Nexus 7 and TF300T where the programmed values in firmware differ
from reality.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
[moved "prop" before DMA buffer]
Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
---
v5: rebase against dtor/input/for-linus
---
 drivers/input/touchscreen/elants_i2c.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/input/touchscreen/elants_i2c.c b/drivers/input/touchscreen/elants_i2c.c
index 61a9098f35d2..d2be61ae6722 100644
--- a/drivers/input/touchscreen/elants_i2c.c
+++ b/drivers/input/touchscreen/elants_i2c.c
@@ -33,6 +33,7 @@
 #include <linux/slab.h>
 #include <linux/firmware.h>
 #include <linux/input/mt.h>
+#include <linux/input/touchscreen.h>
 #include <linux/acpi.h>
 #include <linux/of.h>
 #include <linux/gpio/consumer.h>
@@ -152,6 +153,7 @@ struct elants_data {
 	unsigned int y_res;
 	unsigned int x_max;
 	unsigned int y_max;
+	struct touchscreen_properties prop;
 
 	enum elants_state state;
 	enum elants_iap_mode iap_mode;
@@ -901,8 +903,7 @@ static void elants_i2c_mt_event(struct elants_data *ts, u8 *buf,
 
 			input_mt_slot(input, i);
 			input_mt_report_slot_state(input, tool_type, true);
-			input_event(input, EV_ABS, ABS_MT_POSITION_X, x);
-			input_event(input, EV_ABS, ABS_MT_POSITION_Y, y);
+			touchscreen_report_pos(input, &ts->prop, x, y, true);
 			input_event(input, EV_ABS, ABS_MT_PRESSURE, p);
 			input_event(input, EV_ABS, ABS_MT_TOUCH_MAJOR, w);
 
@@ -1331,6 +1332,8 @@ static int elants_i2c_probe(struct i2c_client *client,
 	input_abs_set_res(ts->input, ABS_MT_POSITION_Y, ts->y_res);
 	input_abs_set_res(ts->input, ABS_MT_TOUCH_MAJOR, 1);
 
+	touchscreen_parse_properties(ts->input, true, &ts->prop);
+
 	error = input_mt_init_slots(ts->input, MAX_CONTACT_NUM,
 				    INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
 	if (error) {
-- 
2.20.1

[PATCH v5 07/10] input: elants: support 0x66 reply opcode for reporting touches

[Michał Mirosław]

From: Dmitry Osipenko <digetx@gmail.com>

eKTF3624 touchscreen firmware uses two variants of the reply opcodes for
reporting touch events: one is 0x63 (used by older firmware) and other is
0x66 (used by newer firmware). The 0x66 variant is equal to 0x63 of
eKTH3500, while 0x63 needs small adjustment of the touch pressure value.

Nexus 7 tablet device has eKTF3624 touchscreen and it uses 0x66 opcode for
reporting touch events, let's support it now. Other devices, eg. ASUS TF300T,
use 0x63.

Note: CMD_HEADER_REK is used for replying to calibration requests, it has
the same 0x66 opcode number which eKTF3624 uses for reporting touches.
The calibration replies are handled separately from the the rest of the
commands in the driver by entering into ELAN_WAIT_RECALIBRATION state
and thus this change shouldn't change the old behavior.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Tested-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
---
 drivers/input/touchscreen/elants_i2c.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/input/touchscreen/elants_i2c.c b/drivers/input/touchscreen/elants_i2c.c
index 88294bc491e8..7eb74eb832d7 100644
--- a/drivers/input/touchscreen/elants_i2c.c
+++ b/drivers/input/touchscreen/elants_i2c.c
@@ -61,6 +61,15 @@
 #define QUEUE_HEADER_NORMAL	0X63
 #define QUEUE_HEADER_WAIT	0x64
 
+/*
+ * Depending on firmware version, eKTF3624 touchscreens may utilize one of
+ * these opcodes for the touch events: 0x63 and 0x66. The 0x63 is used by
+ * older firmware version and differs from 0x66 such that touch pressure
+ * value needs to be adjusted. The 0x66 opcode of newer firmware is equal
+ * to 0x63 of eKTH3500.
+ */
+#define QUEUE_HEADER_NORMAL2	0x66
+
 /* Command header definition */
 #define CMD_HEADER_WRITE	0x54
 #define CMD_HEADER_READ		0x53
@@ -1057,7 +1066,6 @@ static irqreturn_t elants_i2c_irq(int irq, void *_dev)
 		switch (ts->buf[FW_HDR_TYPE]) {
 		case CMD_HEADER_HELLO:
 		case CMD_HEADER_RESP:
-		case CMD_HEADER_REK:
 			break;
 
 		case QUEUE_HEADER_WAIT:
@@ -1077,6 +1085,7 @@ static irqreturn_t elants_i2c_irq(int irq, void *_dev)
 			break;
 
 		case QUEUE_HEADER_NORMAL:
+		case QUEUE_HEADER_NORMAL2:
 			report_count = ts->buf[FW_HDR_COUNT];
 			if (report_count == 0 || report_count > 3) {
 				dev_err(&client->dev,
-- 
2.20.1

[PATCH v5 06/10] input: elants: read touchscreen size for EKTF3624

[Michał Mirosław]

EKTF3624 as present in Asus TF300T tablet has touchscreen size encoded
in different registers.

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Reviewed-by: Dmitry Osipenko <digetx@gmail.com>
Tested-by: Dmitry Osipenko <digetx@gmail.com>
---
 drivers/input/touchscreen/elants_i2c.c | 82 ++++++++++++++++++++++++--
 1 file changed, 77 insertions(+), 5 deletions(-)

diff --git a/drivers/input/touchscreen/elants_i2c.c b/drivers/input/touchscreen/elants_i2c.c
index 74ece2091c76..88294bc491e8 100644
--- a/drivers/input/touchscreen/elants_i2c.c
+++ b/drivers/input/touchscreen/elants_i2c.c
@@ -35,7 +35,7 @@
 #include <linux/input/mt.h>
 #include <linux/input/touchscreen.h>
 #include <linux/acpi.h>
-#include <linux/of.h>
+#include <linux/of_device.h>
 #include <linux/gpio/consumer.h>
 #include <linux/regulator/consumer.h>
 #include <asm/unaligned.h>
@@ -43,6 +43,10 @@
 /* Device, Driver information */
 #define DEVICE_NAME	"elants_i2c"
 
+/* Device IDs */
+#define EKTH3500	0
+#define EKTF3624	1
+
 /* Convert from rows or columns into resolution */
 #define ELAN_TS_RESOLUTION(n, m)   (((n) - 1) * (m))
 
@@ -166,6 +170,7 @@ struct elants_data {
 
 	bool wake_irq_enabled;
 	bool keep_power_in_suspend;
+	u8 chip_id;
 
 	/* Must be last to be used for DMA operations */
 	u8 buf[MAX_PACKET_SIZE] ____cacheline_aligned;
@@ -444,7 +449,58 @@ static int elants_i2c_query_bc_version(struct elants_data *ts)
 	return 0;
 }
 
-static int elants_i2c_query_ts_info(struct elants_data *ts)
+static int elants_i2c_query_ts_info_ektf(struct elants_data *ts)
+{
+	struct i2c_client *client = ts->client;
+	int error;
+	u8 resp[4];
+	u16 phy_x, phy_y;
+	const u8 get_xres_cmd[] = {
+		CMD_HEADER_READ, E_INFO_X_RES, 0x00, 0x00
+	};
+	const u8 get_yres_cmd[] = {
+		CMD_HEADER_READ, E_INFO_Y_RES, 0x00, 0x00
+	};
+
+	/* Get X/Y size in mm */
+	error = elants_i2c_execute_command(client, get_xres_cmd,
+					   sizeof(get_xres_cmd),
+					   resp, sizeof(resp), 1,
+					   "get X size");
+	if (error)
+		return error;
+
+	phy_x = resp[2] | ((resp[3] & 0xF0) << 4);
+
+	error = elants_i2c_execute_command(client, get_yres_cmd,
+					   sizeof(get_yres_cmd),
+					   resp, sizeof(resp), 1,
+					   "get Y size");
+	if (error)
+		return error;
+
+	phy_y = resp[2] | ((resp[3] & 0xF0) << 4);
+
+	if (!phy_x || !phy_y) {
+		dev_warn(&client->dev,
+			 "invalid size data: %d x %d mm\n",
+			 phy_x, phy_y);
+		return 0;
+	}
+
+	dev_dbg(&client->dev, "phy_x=%d, phy_y=%d\n", phy_x, phy_y);
+
+	/* calculate resolution from size */
+	ts->x_max = 2240-1;
+	ts->x_res = DIV_ROUND_CLOSEST(ts->prop.max_x, phy_x);
+
+	ts->y_max = 1408-1;
+	ts->y_res = DIV_ROUND_CLOSEST(ts->prop.max_y, phy_y);
+
+	return 0;
+}
+
+static int elants_i2c_query_ts_info_ekth(struct elants_data *ts)
 {
 	struct i2c_client *client = ts->client;
 	int error;
@@ -595,8 +651,20 @@ static int elants_i2c_initialize(struct elants_data *ts)
 		error = elants_i2c_query_fw_version(ts);
 	if (!error)
 		error = elants_i2c_query_test_version(ts);
-	if (!error)
-		error = elants_i2c_query_ts_info(ts);
+
+	switch (ts->chip_id) {
+	case EKTH3500:
+		if (!error)
+			error = elants_i2c_query_ts_info_ekth(ts);
+		break;
+	case EKTF3624:
+		if (!error)
+			error = elants_i2c_query_ts_info_ektf(ts);
+		break;
+	default:
+		unreachable();
+		break;
+	}
 
 	if (error)
 		ts->iap_mode = ELAN_IAP_RECOVERY;
@@ -1252,6 +1320,9 @@ static int elants_i2c_probe(struct i2c_client *client,
 	ts->client = client;
 	i2c_set_clientdata(client, ts);
 
+	if (client->dev.of_node)
+		ts->chip_id = (uintptr_t)of_device_get_match_data(&client->dev);
+
 	ts->vcc33 = devm_regulator_get(&client->dev, "vcc33");
 	if (IS_ERR(ts->vcc33)) {
 		error = PTR_ERR(ts->vcc33);
@@ -1480,7 +1551,8 @@ MODULE_DEVICE_TABLE(acpi, elants_acpi_id);
 
 #ifdef CONFIG_OF
 static const struct of_device_id elants_of_match[] = {
-	{ .compatible = "elan,ekth3500" },
+	{ .compatible = "elan,ekth3500", .data = (void *)EKTH3500 },
+	{ .compatible = "elan,ektf3624", .data = (void *)EKTF3624 },
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, elants_of_match);
-- 
2.20.1

[PATCH v5 08/10] dt-bindings: input: elants-i2c: Document common touchscreen properties

[Michał Mirosław]

From: Dmitry Osipenko <digetx@gmail.com>

Document support of the common touchscreen properties.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Reviewed-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Acked-by: Rob Herring <robh@kernel.org>
---
 Documentation/devicetree/bindings/input/elants_i2c.txt | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Documentation/devicetree/bindings/input/elants_i2c.txt b/Documentation/devicetree/bindings/input/elants_i2c.txt
index 5edac8be0802..45fab32bbc19 100644
--- a/Documentation/devicetree/bindings/input/elants_i2c.txt
+++ b/Documentation/devicetree/bindings/input/elants_i2c.txt
@@ -14,9 +14,13 @@ Optional properties:
 - reset-gpios: reset gpio the chip is connected to.
 - vcc33-supply: a phandle for the regulator supplying 3.3V power.
 - vccio-supply: a phandle for the regulator supplying IO power.
+- see [2] for additional properties
+
+For additional optional properties see: touchscreen.txt
 
 [0]: Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
 [1]: Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
+[2]: Documentation/devicetree/bindings/input/touchscreen/touchscreen.txt
 
 Example:
 	&i2c1 {
-- 
2.20.1

[PATCH v5 09/10] dt-bindings: input: elants-i2c: Document eKTF3624

[Michał Mirosław]

From: Dmitry Osipenko <digetx@gmail.com>

The eKTF3624 hardware is similar to eKTH3500.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Reviewed-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Acked-by: Rob Herring <robh@kernel.org>
---
 Documentation/devicetree/bindings/input/elants_i2c.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/input/elants_i2c.txt b/Documentation/devicetree/bindings/input/elants_i2c.txt
index 45fab32bbc19..1bc60303f0ea 100644
--- a/Documentation/devicetree/bindings/input/elants_i2c.txt
+++ b/Documentation/devicetree/bindings/input/elants_i2c.txt
@@ -1,7 +1,7 @@
 Elantech I2C Touchscreen
 
 Required properties:
-- compatible: must be "elan,ekth3500".
+- compatible: must be "elan,ekth3500" or "elan,ektf3624".
 - reg: I2C address of the chip.
 - interrupts: interrupt to which the chip is connected (see interrupt
   binding[0]).
-- 
2.20.1

[PATCH v5 10/10] dt-bindings: input: touchscreen: elants_i2c: convert to YAML

[Michał Mirosław]

From: David Heidelberg <david@ixit.cz>

Convert elants_i2c.txt DT binding to YAML and put into correct directory.

Signed-off-by: David Heidelberg <david@ixit.cz>
---
 .../devicetree/bindings/input/elants_i2c.txt  | 38 ----------
 .../input/touchscreen/elan,elants_i2c.yaml    | 69 +++++++++++++++++++
 2 files changed, 69 insertions(+), 38 deletions(-)

diff --git a/Documentation/devicetree/bindings/input/elants_i2c.txt b/Documentation/devicetree/bindings/input/elants_i2c.txt
deleted file mode 100644
index 1bc60303f0ea..000000000000
--- a/Documentation/devicetree/bindings/input/elants_i2c.txt
+++ /dev/null
@@ -1,38 +0,0 @@
-Elantech I2C Touchscreen
-
-Required properties:
-- compatible: must be "elan,ekth3500" or "elan,ektf3624".
-- reg: I2C address of the chip.
-- interrupts: interrupt to which the chip is connected (see interrupt
-  binding[0]).
-
-Optional properties:
-- wakeup-source: touchscreen can be used as a wakeup source.
-- pinctrl-names: should be "default" (see pinctrl binding [1]).
-- pinctrl-0: a phandle pointing to the pin settings for the device (see
-  pinctrl binding [1]).
-- reset-gpios: reset gpio the chip is connected to.
-- vcc33-supply: a phandle for the regulator supplying 3.3V power.
-- vccio-supply: a phandle for the regulator supplying IO power.
-- see [2] for additional properties
-
-For additional optional properties see: touchscreen.txt
-
-[0]: Documentation/devicetree/bindings/interrupt-controller/interrupts.txt
-[1]: Documentation/devicetree/bindings/pinctrl/pinctrl-bindings.txt
-[2]: Documentation/devicetree/bindings/input/touchscreen/touchscreen.txt
-
-Example:
-	&i2c1 {
-		/* ... */
-
-		touchscreen@10 {
-			compatible = "elan,ekth3500";
-			reg = <0x10>;
-			interrupt-parent = <&gpio4>;
-			interrupts = <0x0 IRQ_TYPE_EDGE_FALLING>;
-			wakeup-source;
-		};
-
-		/* ... */
-	};
diff --git a/Documentation/devicetree/bindings/input/touchscreen/elan,elants_i2c.yaml b/Documentation/devicetree/bindings/input/touchscreen/elan,elants_i2c.yaml
new file mode 100644
index 000000000000..a792d6377b1d
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/touchscreen/elan,elants_i2c.yaml
@@ -0,0 +1,69 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/input/touchscreen/elan,elants_i2c.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: Elantech I2C Touchscreen
+
+maintainers:
+  - David Heidelberg <david@ixit.cz>
+
+allOf:
+  - $ref: touchscreen.yaml#
+
+properties:
+  compatible:
+    enum:
+      - elan,ektf3624
+      - elan,ekth3500
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  wakeup-source:
+    type: boolean
+    description: touchscreen can be used as a wakeup source.
+
+  reset-gpios:
+    description: reset gpio the chip is connected to.
+
+  vcc33-supply:
+    description: a phandle for the regulator supplying 3.3V power.
+
+  vccio-supply:
+    description: a phandle for the regulator supplying IO power.
+
+  touchscreen-inverted-x: true
+  touchscreen-inverted-y: true
+  touchscreen-size-x: true
+  touchscreen-size-y: true
+  touchscreen-swapped-x-y: true
+
+additionalProperties: false
+
+required:
+  - compatible
+  - reg
+  - interrupts
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        touchscreen@10 {
+            compatible = "elan,ekth3500";
+            reg = <0x10>;
+
+            interrupt-parent = <&gpio4>;
+            interrupts = <0x0 IRQ_TYPE_EDGE_FALLING>;
+            wakeup-source;
+        };
+    };
-- 
2.20.1

Re: [PATCH v5 03/10] input: elants: remove unused axes

[Dmitry Osipenko]

26.04.2020 20:47, Michał Mirosław пишет:
> Driver only ever reports MT events and input_mt_init_slots() sets up
> emulated axes already.  Clear the capabilities not generated directly
> and move MT axes setup, so they are visible by input_mt_init_slots().
> 
> Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
> Reviewed-by: Dmitry Osipenko <digetx@gmail.com>
> Tested-by: Dmitry Osipenko <digetx@gmail.com>
> ---
> v4: reword commitmsg; reorder axis setup
> ---

v5 applies cleanly to the current linux-next and everything working fine
on both Ubuntu 12.04 and 20.04! Thank you very much :)

Re: [PATCH v5 05/10] input: elants: refactor elants_i2c_execute_command()

[Dmitry Osipenko]

26.04.2020 20:47, Michał Mirosław пишет:
> Apply some DRY-ing to elants_i2c_execute_command() callers.  This pulls
> polling and error printk()s into a single function.
> 
> Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
> ---
> v4: return 0 on success; use %pe for error code
> ---

Hello Michał,

This patch needs to be rebased on a newer linux-next once again :)

Re: [PATCH v5 00/10] input: elants: Support Asus TF300T touchscreen

[Dmitry Osipenko]

26.04.2020 20:47, Michał Mirosław пишет:
> This series cleans up the driver a bit and implements changes needed to
> support EKTF3624-based touchscreen used in Asus TF300T and similar
> Tegra3-based tablets.
> 
> ---
> v2: extended with Dmitry's patches (replaced v1 patches 3 and 4)
> v3: rebased for v5.7-rc1
> v4: rebased onto v5.7-rc2+ (current Linus' master)
>     update "remove unused axes" and "refactor
>       elants_i2c_execute_command()" patches after review
>     add David's patch converting DT binding to YAML
> v5: rebased onto dtor/input/for-linus

Hello Johnny,

Could you please help with reviewing this series? Thanks in advance!

Re: [PATCH v5 03/10] input: elants: remove unused axes

[Dmitry Torokhov]

On Sun, Apr 26, 2020 at 07:47:50PM +0200, Michał Mirosław wrote:
> Driver only ever reports MT events and input_mt_init_slots() sets up
> emulated axes already.  Clear the capabilities not generated directly
> and move MT axes setup, so they are visible by input_mt_init_slots().
> 
> Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
> Reviewed-by: Dmitry Osipenko <digetx@gmail.com>
> Tested-by: Dmitry Osipenko <digetx@gmail.com>

Applied, thank you.

-- 
Dmitry

Re: [PATCH v5 04/10] input: elants: override touchscreen info with DT properties

[Dmitry Torokhov]

On Sun, Apr 26, 2020 at 07:47:51PM +0200, Michał Mirosław wrote:
> Allow overriding of information from hardware and support additional
> common DT properties like axis inversion. This is required for eg.
> Nexus 7 and TF300T where the programmed values in firmware differ
> from reality.
> 
> Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
> [moved "prop" before DMA buffer]
> Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>

Applied, thank you.

-- 
Dmitry

Re: [PATCH v5 05/10] input: elants: refactor elants_i2c_execute_command()

[Dmitry Torokhov]

On Sun, Apr 26, 2020 at 07:47:51PM +0200, Michał Mirosław wrote:
> Apply some DRY-ing to elants_i2c_execute_command() callers.  This pulls
> polling and error printk()s into a single function.
> 
> Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>

Applied, thank you.

-- 
Dmitry

Re: [PATCH v5 07/10] input: elants: support 0x66 reply opcode for reporting touches

[Dmitry Torokhov]

On Sun, Apr 26, 2020 at 07:47:52PM +0200, Michał Mirosław wrote:
> From: Dmitry Osipenko <digetx@gmail.com>
> 
> eKTF3624 touchscreen firmware uses two variants of the reply opcodes for
> reporting touch events: one is 0x63 (used by older firmware) and other is
> 0x66 (used by newer firmware). The 0x66 variant is equal to 0x63 of
> eKTH3500, while 0x63 needs small adjustment of the touch pressure value.
> 
> Nexus 7 tablet device has eKTF3624 touchscreen and it uses 0x66 opcode for
> reporting touch events, let's support it now. Other devices, eg. ASUS TF300T,
> use 0x63.
> 
> Note: CMD_HEADER_REK is used for replying to calibration requests, it has
> the same 0x66 opcode number which eKTF3624 uses for reporting touches.
> The calibration replies are handled separately from the the rest of the
> commands in the driver by entering into ELAN_WAIT_RECALIBRATION state
> and thus this change shouldn't change the old behavior.

Is it possible to know what format a device will use by querying it at
probe time?

Thanks.

-- 
Dmitry

Re: [PATCH v5 01/10] input: elants: document some registers and values

[Dmitry Torokhov]

On Sun, Apr 26, 2020 at 07:47:49PM +0200, Michał Mirosław wrote:
> Add information found in downstream kernels, to make the code less
> magic.
> 
> Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
> Reviewed-by: Dmitry Osipenko <digetx@gmail.com>
> Tested-by: Dmitry Osipenko <digetx@gmail.com>
> ---
>  drivers/input/touchscreen/elants_i2c.c | 29 +++++++++++++++++++++-----
>  1 file changed, 24 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/input/touchscreen/elants_i2c.c b/drivers/input/touchscreen/elants_i2c.c
> index 2289f9638116..d2175fb6209a 100644
> --- a/drivers/input/touchscreen/elants_i2c.c
> +++ b/drivers/input/touchscreen/elants_i2c.c
> @@ -81,7 +81,11 @@
>  
>  #define HEADER_REPORT_10_FINGER	0x62
>  
> -/* Header (4 bytes) plus 3 fill 10-finger packets */
> +/* Power state */
> +#define PWR_STATE_DEEP_SLEEP	0
> +#define PWR_STATE_NORMAL	1
> +
> +/* Header (4 bytes) plus 3 full 10-finger packets */
>  #define MAX_PACKET_SIZE		169
>  
>  #define BOOT_TIME_DELAY_MS	50
> @@ -91,10 +95,21 @@
>  #define E_ELAN_INFO_BC_VER	0x10
>  #define E_ELAN_INFO_TEST_VER	0xE0
>  #define E_ELAN_INFO_FW_ID	0xF0
> +#define E_POWER_MODE		0x40
> +#define E_POWER_STATE		0x50
> +#define E_INFO_X_RES		0x60
> +#define E_INFO_Y_RES		0x63

I would prefer if we introduced these in the patches that use them.

>  #define E_INFO_OSR		0xD6
>  #define E_INFO_PHY_SCAN		0xD7
>  #define E_INFO_PHY_DRIVER	0xD8
>  
> +/* FW write command, 0x54 0x?? 0x0, 0x01 */
> +#define E_POWER_MODE_BATTERY	0x40
> +#define E_POWER_MODE_AC		0x41
> +#define E_POWER_MODE_USB	0x42

What is this for?

> +#define E_POWER_STATE_SLEEP	0x50
> +#define E_POWER_STATE_RESUME	0x58

Thanks.

-- 
Dmitry

Re: [PATCH v5 07/10] input: elants: support 0x66 reply opcode for reporting touches

[Dmitry Osipenko]

18.05.2020 07:05, Dmitry Torokhov пишет:
> On Sun, Apr 26, 2020 at 07:47:52PM +0200, Michał Mirosław wrote:
>> From: Dmitry Osipenko <digetx@gmail.com>
>>
>> eKTF3624 touchscreen firmware uses two variants of the reply opcodes for
>> reporting touch events: one is 0x63 (used by older firmware) and other is
>> 0x66 (used by newer firmware). The 0x66 variant is equal to 0x63 of
>> eKTH3500, while 0x63 needs small adjustment of the touch pressure value.
>>
>> Nexus 7 tablet device has eKTF3624 touchscreen and it uses 0x66 opcode for
>> reporting touch events, let's support it now. Other devices, eg. ASUS TF300T,
>> use 0x63.
>>
>> Note: CMD_HEADER_REK is used for replying to calibration requests, it has
>> the same 0x66 opcode number which eKTF3624 uses for reporting touches.
>> The calibration replies are handled separately from the the rest of the
>> commands in the driver by entering into ELAN_WAIT_RECALIBRATION state
>> and thus this change shouldn't change the old behavior.
> 
> Is it possible to know what format a device will use by querying it at
> probe time?

I guess only somebody from Elan could answer this question. AFAIK,
neither touchscreen firmware sources nor technical documentation aren't
publicly available.

Downstream kernel driver is the only source of information in our case
and it does the same thing as we do in this patch.

Re: [PATCH v5 01/10] input: elants: document some registers and values

[Dmitry Osipenko]

18.05.2020 07:07, Dmitry Torokhov пишет:
...
>> +/* FW write command, 0x54 0x?? 0x0, 0x01 */
>> +#define E_POWER_MODE_BATTERY	0x40
>> +#define E_POWER_MODE_AC		0x41
>> +#define E_POWER_MODE_USB	0x42
> 
> What is this for?

It is possible to switch the touchscreen's power source. Downstream
kernel switches away from the battery source when USB cable is connected
and baterry is charging. This is not supported by upstream driver yet, I
guess it should be good to postpone adding these FW opcodes until they
will become actually needed.