[PATCH v2 0/6] Add Wacom I2C support to rM2

Add support to the reMarkable2 (rM2) for the Wacom I2C device.

This is based on the reMarkable Linux fork and with this series I am
able to probe the Wacom digitiser.

Alistair Francis (6):
  devicetree/bindings: Initial commit of wacom,wacom-i2c
  input/touchscreen: Add device tree support to wacom_i2c
  touchscreen/wacom_i2c: Add support for distance and tilt x/y
  touchscreen/wacom_i2c: Clean up the query device fields
  touchscreen/wacom_i2c: Add support for vdd regulator
  arch/arm: reMarkable2: Enable wacom_i2c

 .../input/touchscreen/wacom,wacom-i2c.yaml    |  48 +++++++
 .../devicetree/bindings/vendor-prefixes.yaml  |   2 +
 arch/arm/boot/dts/imx7d-remarkable2.dts       |  41 ++++++
 arch/arm/configs/imx_v6_v7_defconfig          |   1 +
 drivers/input/touchscreen/wacom_i2c.c         | 136 +++++++++++++++---
 5 files changed, 205 insertions(+), 23 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/input/touchscreen/wacom,wacom-i2c.yaml

-- 
2.29.2

Enable the wacom_i2c touchscreen for the reMarkable2.

Signed-off-by: Alistair Francis <redacted>
---
 arch/arm/boot/dts/imx7d-remarkable2.dts | 41 +++++++++++++++++++++++++
 arch/arm/configs/imx_v6_v7_defconfig    |  1 +
 2 files changed, 42 insertions(+)

diff --git a/arch/arm/boot/dts/imx7d-remarkable2.dts b/arch/arm/boot/dts/imx7d-remarkable2.dts
index fba55a0e028a..8052d884a5e5 100644
--- a/arch/arm/boot/dts/imx7d-remarkable2.dts
+++ b/arch/arm/boot/dts/imx7d-remarkable2.dts

@@ -150,6 +150,30 @@ &dma_apbh {
 	status = "disabled";
 };
 
+&i2c1 {
+	clock-frequency = <400000>;
+	pinctrl-names = "default", "sleep";
+	pinctrl-0 = <&pinctrl_i2c1>;
+	pinctrl-1 = <&pinctrl_i2c1>;
+	status = "okay";
+
+	digitizer: wacom-i2c@9 {
+		pinctrl-names = "default", "sleep";
+		pinctrl-0 = <&pinctrl_wacom>;
+		pinctrl-1 = <&pinctrl_wacom>;
+		compatible = "wacom,wacom-i2c";
+		reg = <0x09>;
+		interrupt-parent = <&gpio1>;
+		interrupts = <1 2>;
+		flip-tilt-x;
+		flip-tilt-y;
+		flip-pos-x;
+		flip-pos-y;
+		flip-distance;
+		vdd-supply = <&reg_digitizer>;
+	};
+};
+
 &sdma {
 	status = "okay";
 };

@@ -221,6 +245,16 @@ &wdog1 {
 };
 
 &iomuxc_lpsr {
+	pinctrl_wacom: wacomgrp {
+		fsl,pins = <
+			/*MX7D_PAD_LPSR_GPIO1_IO00__GPIO1_IO0	0x00000074 /* WACOM RESET */
+			MX7D_PAD_LPSR_GPIO1_IO01__GPIO1_IO1	0x00000034 /* WACOM INT */
+			MX7D_PAD_LPSR_GPIO1_IO04__GPIO1_IO4	0x00000074 /* PDCTB */
+			/*MX7D_PAD_LPSR_GPIO1_IO05__GPIO1_IO5	0x00000014 /* FWE */
+			/*MX7D_PAD_LPSR_GPIO1_IO06__GPIO1_IO6	0x00000014 /* WACOM PWR ENABLE */
+		>;
+	};
+
 	pinctrl_digitizer_reg: digitizerreggrp {
 		fsl,pins = <
 			/* DIGITIZER_PWR_EN */

@@ -236,6 +270,13 @@ MX7D_PAD_SAI1_RX_SYNC__GPIO6_IO16	0x59
 		>;
 	};
 
+	pinctrl_i2c1: i2c1grp {
+		fsl,pins = <
+			MX7D_PAD_I2C1_SDA__I2C1_SDA		0x4000007f
+			MX7D_PAD_I2C1_SCL__I2C1_SCL		0x4000007f
+		>;
+	};
+
 	pinctrl_uart1: uart1grp {
 		fsl,pins = <
 			MX7D_PAD_UART1_TX_DATA__UART1_DCE_TX	0x79

diff --git a/arch/arm/configs/imx_v6_v7_defconfig b/arch/arm/configs/imx_v6_v7_defconfig
index fa9229616106..2fc8dc6a8b0a 100644
--- a/arch/arm/configs/imx_v6_v7_defconfig
+++ b/arch/arm/configs/imx_v6_v7_defconfig

@@ -167,6 +167,7 @@ CONFIG_TOUCHSCREEN_DA9052=y
 CONFIG_TOUCHSCREEN_EGALAX=y
 CONFIG_TOUCHSCREEN_GOODIX=y
 CONFIG_TOUCHSCREEN_ILI210X=y
+CONFIG_TOUCHSCREEN_WACOM_I2C=y
 CONFIG_TOUCHSCREEN_MAX11801=y
 CONFIG_TOUCHSCREEN_IMX6UL_TSC=y
 CONFIG_TOUCHSCREEN_EDT_FT5X06=y

-- 
2.29.2

Add support for a VDD regulator. This allows the kernel to prove the
Wacom-I2C device on the rM2.

Signed-off-by: Alistair Francis <redacted>
---
 drivers/input/touchscreen/wacom_i2c.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/drivers/input/touchscreen/wacom_i2c.c b/drivers/input/touchscreen/wacom_i2c.c
index a22570adc939..6d85a7bd0502 100644
--- a/drivers/input/touchscreen/wacom_i2c.c
+++ b/drivers/input/touchscreen/wacom_i2c.c

@@ -13,6 +13,7 @@
 #include <linux/irq.h>
 #include <linux/input/touchscreen.h>
 #include <linux/interrupt.h>
+#include <linux/regulator/consumer.h>
 #include <linux/reset.h>
 #include <linux/of.h>
 #include <asm/unaligned.h>

@@ -56,6 +57,7 @@ struct wacom_i2c {
 	struct i2c_client *client;
 	struct input_dev *input;
 	struct touchscreen_properties props;
+	struct regulator *vdd;
 	u8 data[WACOM_QUERY_SIZE];
 	bool prox;
 	int tool;

@@ -203,11 +205,29 @@ static int wacom_i2c_probe(struct i2c_client *client,
 	struct wacom_features features = { 0 };
 	int error;
 
+	wac_i2c = kzalloc(sizeof(*wac_i2c), GFP_KERNEL);
+	if (!wac_i2c)
+		return -ENOMEM;
+
 	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
 		dev_err(&client->dev, "i2c_check_functionality error\n");
 		return -EIO;
 	}
 
+	wac_i2c->vdd = regulator_get(&client->dev, "vdd");
+	if (IS_ERR(wac_i2c->vdd)) {
+		error = PTR_ERR(wac_i2c->vdd);
+		kfree(wac_i2c);
+		return error;
+	}
+
+	error = regulator_enable(wac_i2c->vdd);
+	if (error) {
+		regulator_put(wac_i2c->vdd);
+		kfree(wac_i2c);
+		return error;
+	}
+
 	error = wacom_query_device(client, &features);
 	if (error)
 		return error;

@@ -276,6 +296,8 @@ static int wacom_i2c_probe(struct i2c_client *client,
 err_free_irq:
 	free_irq(client->irq, wac_i2c);
 err_free_mem:
+	regulator_disable(wac_i2c->vdd);
+	regulator_put(wac_i2c->vdd);
 	input_free_device(input);
 	kfree(wac_i2c);
 

-- 
2.29.2

Allow the wacom-i2c device to be exposed via device tree.

Signed-off-by: Alistair Francis <redacted>
---
 .../input/touchscreen/wacom,wacom-i2c.yaml       |  4 ++++
 drivers/input/touchscreen/wacom_i2c.c            | 16 ++++++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/Documentation/devicetree/bindings/input/touchscreen/wacom,wacom-i2c.yaml b/Documentation/devicetree/bindings/input/touchscreen/wacom,wacom-i2c.yaml
index b36d22cd20a2..06ad5ee561af 100644
--- a/Documentation/devicetree/bindings/input/touchscreen/wacom,wacom-i2c.yaml
+++ b/Documentation/devicetree/bindings/input/touchscreen/wacom,wacom-i2c.yaml

@@ -22,6 +22,9 @@ properties:
   interrupts:
     maxItems: 1
 
+  vdd-supply:
+    maxItems: 1
+
 required:
   - compatible
   - reg

@@ -40,5 +43,6 @@ examples:
                 reg = <0x9>;
                 interrupt-parent = <&gpio1>;
                 interrupts = <9 IRQ_TYPE_LEVEL_LOW>;
+                vdd-supply = <&reg_touch>;
         };
     };

diff --git a/drivers/input/touchscreen/wacom_i2c.c b/drivers/input/touchscreen/wacom_i2c.c
index 1afc6bde2891..ec6e0aff8deb 100644
--- a/drivers/input/touchscreen/wacom_i2c.c
+++ b/drivers/input/touchscreen/wacom_i2c.c

@@ -11,7 +11,9 @@
 #include <linux/i2c.h>
 #include <linux/slab.h>
 #include <linux/irq.h>
+#include <linux/input/touchscreen.h>
 #include <linux/interrupt.h>
+#include <linux/of.h>
 #include <asm/unaligned.h>
 
 #define WACOM_CMD_QUERY0	0x04

@@ -32,6 +34,7 @@ struct wacom_features {
 struct wacom_i2c {
 	struct i2c_client *client;
 	struct input_dev *input;
+	struct touchscreen_properties props;
 	u8 data[WACOM_QUERY_SIZE];
 	bool prox;
 	int tool;

@@ -187,6 +190,7 @@ static int wacom_i2c_probe(struct i2c_client *client,
 	__set_bit(BTN_STYLUS2, input->keybit);
 	__set_bit(BTN_TOUCH, input->keybit);
 
+	touchscreen_parse_properties(input, true, &wac_i2c->props);
 	input_set_abs_params(input, ABS_X, 0, features.x_max, 0, 0);
 	input_set_abs_params(input, ABS_Y, 0, features.y_max, 0, 0);
 	input_set_abs_params(input, ABS_PRESSURE,

@@ -214,6 +218,7 @@ static int wacom_i2c_probe(struct i2c_client *client,
 	}
 
 	i2c_set_clientdata(client, wac_i2c);
+
 	return 0;
 
 err_free_irq:

@@ -262,10 +267,21 @@ static const struct i2c_device_id wacom_i2c_id[] = {
 };
 MODULE_DEVICE_TABLE(i2c, wacom_i2c_id);
 
+#ifdef CONFIG_OF
+static const struct of_device_id wacom_i2c_of_match_table[] = {
+	{ .compatible = "wacom,wacom-i2c" },
+	{}
+};
+MODULE_DEVICE_TABLE(of, wacom_i2c_of_match_table);
+#endif
+
 static struct i2c_driver wacom_i2c_driver = {
 	.driver	= {
 		.name	= "wacom_i2c",
 		.pm	= &wacom_i2c_pm,
+#ifdef CONFIG_OF
+		.of_match_table = of_match_ptr(wacom_i2c_of_match_table),
+#endif
 	},
 
 	.probe		= wacom_i2c_probe,

-- 
2.29.2

Signed-off-by: Alistair Francis <redacted>
---
 .../input/touchscreen/wacom,wacom-i2c.yaml    | 44 +++++++++++++++++++
 .../devicetree/bindings/vendor-prefixes.yaml  |  2 +
 2 files changed, 46 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/input/touchscreen/wacom,wacom-i2c.yaml

diff --git a/Documentation/devicetree/bindings/input/touchscreen/wacom,wacom-i2c.yaml b/Documentation/devicetree/bindings/input/touchscreen/wacom,wacom-i2c.yaml
new file mode 100644
index 000000000000..b36d22cd20a2
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/touchscreen/wacom,wacom-i2c.yaml

@@ -0,0 +1,44 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/input/touchscreen/wacom,wacom-i2c.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Wacom I2C Controller
+
+maintainers:
+  - Alistair Francis <alistair@alistair23.me>
+
+allOf:
+  - $ref: touchscreen.yaml#
+
+properties:
+  compatible:
+    const: wacom,wacom-i2c
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - interrupts
+
+additionalProperties: false
+
+examples:
+  - |
+    #include "dt-bindings/interrupt-controller/irq.h"
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+        digitiser@9 {
+                compatible = "wacom,wacom-i2c";
+                reg = <0x9>;
+                interrupt-parent = <&gpio1>;
+                interrupts = <9 IRQ_TYPE_LEVEL_LOW>;
+        };
+    };

diff --git a/Documentation/devicetree/bindings/vendor-prefixes.yaml b/Documentation/devicetree/bindings/vendor-prefixes.yaml
index 041ae90b0d8f..5bca22f035a3 100644
--- a/Documentation/devicetree/bindings/vendor-prefixes.yaml
+++ b/Documentation/devicetree/bindings/vendor-prefixes.yaml

@@ -1202,6 +1202,8 @@ patternProperties:
     description: Vision Optical Technology Co., Ltd.
   "^vxt,.*":
     description: VXT Ltd
+  "^wacom,.*":
+    description: Wacom Co., Ltd
   "^wand,.*":
     description: Wandbord (Technexion)
   "^waveshare,.*":

-- 
2.29.2

This is based on the out of tree rM2 driver.

Signed-off-by: Alistair Francis <redacted>
---
 drivers/input/touchscreen/wacom_i2c.c | 25 +++++++++++++++++++++++--
 1 file changed, 23 insertions(+), 2 deletions(-)

diff --git a/drivers/input/touchscreen/wacom_i2c.c b/drivers/input/touchscreen/wacom_i2c.c
index ec6e0aff8deb..5f0b80d52ad5 100644
--- a/drivers/input/touchscreen/wacom_i2c.c
+++ b/drivers/input/touchscreen/wacom_i2c.c

@@ -22,12 +22,16 @@
 #define WACOM_CMD_QUERY3	0x02
 #define WACOM_CMD_THROW0	0x05
 #define WACOM_CMD_THROW1	0x00
-#define WACOM_QUERY_SIZE	19
+#define WACOM_QUERY_SIZE	22
 
 struct wacom_features {
 	int x_max;
 	int y_max;
 	int pressure_max;
+	int distance_max;
+	int distance_physical_max;
+	int tilt_x_max;
+	int tilt_y_max;
 	char fw_version;
 };
 

@@ -79,6 +83,10 @@ static int wacom_query_device(struct i2c_client *client,
 	features->y_max = get_unaligned_le16(&data[5]);
 	features->pressure_max = get_unaligned_le16(&data[11]);
 	features->fw_version = get_unaligned_le16(&data[13]);
+	features->distance_max = data[15];
+	features->distance_physical_max = data[16];
+	features->tilt_x_max = get_unaligned_le16(&data[17]);
+	features->tilt_y_max = get_unaligned_le16(&data[19]);
 
 	dev_dbg(&client->dev,
 		"x_max:%d, y_max:%d, pressure:%d, fw:%d\n",

@@ -95,6 +103,7 @@ static irqreturn_t wacom_i2c_irq(int irq, void *dev_id)
 	u8 *data = wac_i2c->data;
 	unsigned int x, y, pressure;
 	unsigned char tsw, f1, f2, ers;
+	short tilt_x, tilt_y, distance;
 	int error;
 
 	error = i2c_master_recv(wac_i2c->client,

@@ -109,6 +118,11 @@ static irqreturn_t wacom_i2c_irq(int irq, void *dev_id)
 	x = le16_to_cpup((__le16 *)&data[4]);
 	y = le16_to_cpup((__le16 *)&data[6]);
 	pressure = le16_to_cpup((__le16 *)&data[8]);
+	distance = data[10];
+
+	/* Signed */
+	tilt_x = le16_to_cpup((__le16 *)&data[11]);
+	tilt_y = le16_to_cpup((__le16 *)&data[13]);
 
 	if (!wac_i2c->prox)
 		wac_i2c->tool = (data[3] & 0x0c) ?

@@ -123,6 +137,9 @@ static irqreturn_t wacom_i2c_irq(int irq, void *dev_id)
 	input_report_abs(input, ABS_X, x);
 	input_report_abs(input, ABS_Y, y);
 	input_report_abs(input, ABS_PRESSURE, pressure);
+	input_report_abs(input, ABS_DISTANCE, distance);
+	input_report_abs(input, ABS_TILT_X, tilt_x);
+	input_report_abs(input, ABS_TILT_Y, tilt_y);
 	input_sync(input);
 
 out:

@@ -195,7 +212,11 @@ static int wacom_i2c_probe(struct i2c_client *client,
 	input_set_abs_params(input, ABS_Y, 0, features.y_max, 0, 0);
 	input_set_abs_params(input, ABS_PRESSURE,
 			     0, features.pressure_max, 0, 0);
-
+	input_set_abs_params(input, ABS_DISTANCE, 0, features.distance_max, 0, 0);
+	input_set_abs_params(input, ABS_TILT_X, -features.tilt_x_max,
+			     features.tilt_x_max, 0, 0);
+	input_set_abs_params(input, ABS_TILT_Y, -features.tilt_y_max,
+			     features.tilt_y_max, 0, 0);
 	input_set_drvdata(input, wac_i2c);
 
 	error = request_threaded_irq(client->irq, NULL, wacom_i2c_irq,

-- 
2.29.2

Improve the query device fields to be more verbose.

Signed-off-by: Alistair Francis <redacted>
---
 drivers/input/touchscreen/wacom_i2c.c | 73 +++++++++++++++++++--------
 1 file changed, 52 insertions(+), 21 deletions(-)

diff --git a/drivers/input/touchscreen/wacom_i2c.c b/drivers/input/touchscreen/wacom_i2c.c
index 5f0b80d52ad5..a22570adc939 100644
--- a/drivers/input/touchscreen/wacom_i2c.c
+++ b/drivers/input/touchscreen/wacom_i2c.c

@@ -13,15 +13,32 @@
 #include <linux/irq.h>
 #include <linux/input/touchscreen.h>
 #include <linux/interrupt.h>
+#include <linux/reset.h>
 #include <linux/of.h>
 #include <asm/unaligned.h>
 
-#define WACOM_CMD_QUERY0	0x04
-#define WACOM_CMD_QUERY1	0x00
-#define WACOM_CMD_QUERY2	0x33
-#define WACOM_CMD_QUERY3	0x02
-#define WACOM_CMD_THROW0	0x05
-#define WACOM_CMD_THROW1	0x00
+// Registers
+#define WACOM_COMMAND_LSB   0x04
+#define WACOM_COMMAND_MSB   0x00
+
+#define WACOM_DATA_LSB      0x05
+#define WACOM_DATA_MSB      0x00
+
+// Report types
+#define REPORT_FEATURE      0x30
+
+// Requests / operations
+#define OPCODE_GET_REPORT   0x02
+
+// Power settings
+#define POWER_ON            0x00
+#define POWER_SLEEP         0x01
+
+// Input report ids
+#define WACOM_PEN_DATA_REPORT           2
+#define WACOM_SHINONOME_REPORT          26
+
+#define WACOM_QUERY_REPORT	3
 #define WACOM_QUERY_SIZE	22
 
 struct wacom_features {

@@ -45,34 +62,44 @@ struct wacom_i2c {
 };
 
 static int wacom_query_device(struct i2c_client *client,
-			      struct wacom_features *features)
+				  struct wacom_features *features)
 {
 	int ret;
-	u8 cmd1[] = { WACOM_CMD_QUERY0, WACOM_CMD_QUERY1,
-			WACOM_CMD_QUERY2, WACOM_CMD_QUERY3 };
-	u8 cmd2[] = { WACOM_CMD_THROW0, WACOM_CMD_THROW1 };
 	u8 data[WACOM_QUERY_SIZE];
+	struct reset_control *rstc;
+
+	u8 get_query_data_cmd[] = {
+		WACOM_COMMAND_LSB,
+		WACOM_COMMAND_MSB,
+		REPORT_FEATURE | WACOM_QUERY_REPORT,
+		OPCODE_GET_REPORT,
+		WACOM_DATA_LSB,
+		WACOM_DATA_MSB,
+	};
+
 	struct i2c_msg msgs[] = {
+		// Request reading of feature ReportID: 3 (Pen Query Data)
 		{
 			.addr = client->addr,
 			.flags = 0,
-			.len = sizeof(cmd1),
-			.buf = cmd1,
-		},
-		{
-			.addr = client->addr,
-			.flags = 0,
-			.len = sizeof(cmd2),
-			.buf = cmd2,
+			.len = sizeof(get_query_data_cmd),
+			.buf = get_query_data_cmd,
 		},
+		// Read 21 bytes
 		{
 			.addr = client->addr,
 			.flags = I2C_M_RD,
-			.len = sizeof(data),
+			.len = WACOM_QUERY_SIZE - 1,
 			.buf = data,
 		},
 	};
 
+	rstc = devm_reset_control_get_optional_exclusive(&client->dev, NULL);
+	if (IS_ERR(rstc))
+		dev_err(&client->dev, "Failed to get reset control before init\n");
+	else
+		reset_control_reset(rstc);
+
 	ret = i2c_transfer(client->adapter, msgs, ARRAY_SIZE(msgs));
 	if (ret < 0)
 		return ret;

@@ -89,9 +116,13 @@ static int wacom_query_device(struct i2c_client *client,
 	features->tilt_y_max = get_unaligned_le16(&data[19]);
 
 	dev_dbg(&client->dev,
-		"x_max:%d, y_max:%d, pressure:%d, fw:%d\n",
+		"x_max:%d, y_max:%d, pressure:%d, fw:%d, "
+		"distance: %d, phys distance: %d, "
+		"tilt_x_max: %d, tilt_y_max: %d\n",
 		features->x_max, features->y_max,
-		features->pressure_max, features->fw_version);
+		features->pressure_max, features->fw_version,
+		features->distance_max, features->distance_physical_max,
+		features->tilt_x_max, features->tilt_y_max);
 
 	return 0;
 }

-- 
2.29.2

Hi,

thanks for the patch.

On 21-01-20 22:56, Alistair Francis wrote:

Enable the wacom_i2c touchscreen for the reMarkable2.

Signed-off-by: Alistair Francis <redacted>
---
 arch/arm/boot/dts/imx7d-remarkable2.dts | 41 +++++++++++++++++++++++++
 arch/arm/configs/imx_v6_v7_defconfig    |  1 +

Those two changes should be splitted and the dts patch should be named:
"ARM: dts: imx7d: remarkable2: add wacom digitizer device".

No need to specify the sleep state if both are using the same pinctrl
config.

+	status = "okay";
+
+	digitizer: wacom-i2c@9 {

this should be:
        wacom_digitizer: digitizer@9 {

+		pinctrl-names = "default", "sleep";
+		pinctrl-0 = <&pinctrl_wacom>;
+		pinctrl-1 = <&pinctrl_wacom>;

Same here, sleep and default refer to the same state.

+		compatible = "wacom,wacom-i2c";
+		reg = <0x09>;

compatible and reg are always the first to properties.

+		interrupt-parent = <&gpio1>;
+		interrupts = <1 2>;

Please use defines.

+		flip-tilt-x;
+		flip-tilt-y;
+		flip-pos-x;
+		flip-pos-y;
+		flip-distance;
+		vdd-supply = <&reg_digitizer>;

Where is this regulator added?

Pls, sort this alphabetical.

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Hi,

thnaks for the patch.

On 21-01-20 22:56, Alistair Francis wrote:

Signed-off-by: Alistair Francis <redacted>
---
 .../input/touchscreen/wacom,wacom-i2c.yaml    | 44 +++++++++++++++++++
 .../devicetree/bindings/vendor-prefixes.yaml  |  2 +

This should be splitted into two patches.

Regards,
  Marco

-- 
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On 21-01-20 22:56, Alistair Francis wrote:

Allow the wacom-i2c device to be exposed via device tree.

You did a lot more than exposing.

Unrelated change.

Dito.

Unrelated change.

Unrelated change, please move it into a sepreate patch.

Unrelated change.

This #ifdef can be removed using the __maybe_unused macro.

+static const struct of_device_id wacom_i2c_of_match_table[] = {
+	{ .compatible = "wacom,wacom-i2c" },

IMHO "wacom,wacom-i2c" is not good maybe:
 - "wacom,generic" if you don't know the device, or
 - "wacom,XYZ" where XYZ belongs to the real device name.

+	{}
+};
+MODULE_DEVICE_TABLE(of, wacom_i2c_of_match_table);
+#endif
+
 static struct i2c_driver wacom_i2c_driver = {
 	.driver	= {
 		.name	= "wacom_i2c",
 		.pm	= &wacom_i2c_pm,
+#ifdef CONFIG_OF
+		.of_match_table = of_match_ptr(wacom_i2c_of_match_table),
+#endif

No need for this #ifdef.

Regards,
  Marco

 	},
 
 	.probe		= wacom_i2c_probe,
-- 
2.29.2

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Hi,

thanks for the patch. Please align all your patch-subjects belonging to
the driver to: "Input: wacom_i2c - ..."

On 21-01-20 22:56, Alistair Francis wrote:

-- 
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Hi Alistair,

thanks for the patches. Before getting into the series please check all
your commit subjects. Also please check that you do only one logical
change per patch: e.g. adding DT-Support means: Add the dt-table and not
more.

I looking forward to your v2 :)

Regards,
  Marco

On 21-01-20 22:56, Alistair Francis wrote:

Add support to the reMarkable2 (rM2) for the Wacom I2C device.

This is based on the reMarkable Linux fork and with this series I am
able to probe the Wacom digitiser.

Alistair Francis (6):
  devicetree/bindings: Initial commit of wacom,wacom-i2c
  input/touchscreen: Add device tree support to wacom_i2c
  touchscreen/wacom_i2c: Add support for distance and tilt x/y
  touchscreen/wacom_i2c: Clean up the query device fields
  touchscreen/wacom_i2c: Add support for vdd regulator
  arch/arm: reMarkable2: Enable wacom_i2c

 .../input/touchscreen/wacom,wacom-i2c.yaml    |  48 +++++++
 .../devicetree/bindings/vendor-prefixes.yaml  |   2 +
 arch/arm/boot/dts/imx7d-remarkable2.dts       |  41 ++++++
 arch/arm/configs/imx_v6_v7_defconfig          |   1 +
 drivers/input/touchscreen/wacom_i2c.c         | 136 +++++++++++++++---
 5 files changed, 205 insertions(+), 23 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/input/touchscreen/wacom,wacom-i2c.yaml

-- 
2.29.2

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On Fri, Jan 22, 2021 at 7:32 AM Marco Felsch [off-list ref] wrote:

Hi,

thanks for the patch.

On 21-01-20 22:56, Alistair Francis wrote:

quoted

Enable the wacom_i2c touchscreen for the reMarkable2.

Signed-off-by: Alistair Francis <redacted>
---
 arch/arm/boot/dts/imx7d-remarkable2.dts | 41 +++++++++++++++++++++++++
 arch/arm/configs/imx_v6_v7_defconfig    |  1 +

Those two changes should be splitted and the dts patch should be named:
"ARM: dts: imx7d: remarkable2: add wacom digitizer device".

quoted

 2 files changed, 42 insertions(+)

diff --git a/arch/arm/boot/dts/imx7d-remarkable2.dts b/arch/arm/boot/dts/imx7d-remarkable2.dts
index fba55a0e028a..8052d884a5e5 100644
--- a/arch/arm/boot/dts/imx7d-remarkable2.dts
+++ b/arch/arm/boot/dts/imx7d-remarkable2.dts

@@ -150,6 +150,30 @@ &dma_apbh {
      status = "disabled";
 };

+&i2c1 {
+     clock-frequency = <400000>;
+     pinctrl-names = "default", "sleep";
+     pinctrl-0 = <&pinctrl_i2c1>;
+     pinctrl-1 = <&pinctrl_i2c1>;

No need to specify the sleep state if both are using the same pinctrl
config.

quoted

+     status = "okay";
+
+     digitizer: wacom-i2c@9 {

this should be:
        wacom_digitizer: digitizer@9 {

quoted

+             pinctrl-names = "default", "sleep";
+             pinctrl-0 = <&pinctrl_wacom>;
+             pinctrl-1 = <&pinctrl_wacom>;

Same here, sleep and default refer to the same state.

quoted

+             compatible = "wacom,wacom-i2c";
+             reg = <0x09>;

compatible and reg are always the first to properties.

quoted

+             interrupt-parent = <&gpio1>;
+             interrupts = <1 2>;

Please use defines.

I have addressed all your comments.

quoted

+             flip-tilt-x;
+             flip-tilt-y;
+             flip-pos-x;
+             flip-pos-y;
+             flip-distance;
+             vdd-supply = <&reg_digitizer>;

Where is this regulator added?

It's already in the DT, it will be added with the initial commit
(which is currently on the list).

Alistair

quoted

+     };
+};
+
 &sdma {
      status = "okay";
 };

@@ -221,6 +245,16 @@ &wdog1 {
 };

 &iomuxc_lpsr {
+     pinctrl_wacom: wacomgrp {
+             fsl,pins = <
+                     /*MX7D_PAD_LPSR_GPIO1_IO00__GPIO1_IO0   0x00000074 /* WACOM RESET */
+                     MX7D_PAD_LPSR_GPIO1_IO01__GPIO1_IO1     0x00000034 /* WACOM INT */
+                     MX7D_PAD_LPSR_GPIO1_IO04__GPIO1_IO4     0x00000074 /* PDCTB */
+                     /*MX7D_PAD_LPSR_GPIO1_IO05__GPIO1_IO5   0x00000014 /* FWE */
+                     /*MX7D_PAD_LPSR_GPIO1_IO06__GPIO1_IO6   0x00000014 /* WACOM PWR ENABLE */
+             >;
+     };

Pls, sort this alphabetical.

quoted

+
      pinctrl_digitizer_reg: digitizerreggrp {
              fsl,pins = <
                      /* DIGITIZER_PWR_EN */

@@ -236,6 +270,13 @@ MX7D_PAD_SAI1_RX_SYNC__GPIO6_IO16        0x59
              >;
      };

+     pinctrl_i2c1: i2c1grp {
+             fsl,pins = <
+                     MX7D_PAD_I2C1_SDA__I2C1_SDA             0x4000007f
+                     MX7D_PAD_I2C1_SCL__I2C1_SCL             0x4000007f
+             >;
+     };
+
      pinctrl_uart1: uart1grp {
              fsl,pins = <
                      MX7D_PAD_UART1_TX_DATA__UART1_DCE_TX    0x79

diff --git a/arch/arm/configs/imx_v6_v7_defconfig b/arch/arm/configs/imx_v6_v7_defconfig
index fa9229616106..2fc8dc6a8b0a 100644
--- a/arch/arm/configs/imx_v6_v7_defconfig
+++ b/arch/arm/configs/imx_v6_v7_defconfig

@@ -167,6 +167,7 @@ CONFIG_TOUCHSCREEN_DA9052=y
 CONFIG_TOUCHSCREEN_EGALAX=y
 CONFIG_TOUCHSCREEN_GOODIX=y
 CONFIG_TOUCHSCREEN_ILI210X=y
+CONFIG_TOUCHSCREEN_WACOM_I2C=y
 CONFIG_TOUCHSCREEN_MAX11801=y
 CONFIG_TOUCHSCREEN_IMX6UL_TSC=y
 CONFIG_TOUCHSCREEN_EDT_FT5X06=y
--

2.29.2

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Pengutronix e.K.                           |                             |
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