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

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

[Alistair Francis]

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

[PATCH v2 1/6] devicetree/bindings: Initial commit of wacom,wacom-i2c

[Alistair Francis]

Signed-off-by: Alistair Francis <alistair@alistair23.me>
---
 .../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

[PATCH v2 2/6] input/touchscreen: Add device tree support to wacom_i2c

[Alistair Francis]

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

Signed-off-by: Alistair Francis <alistair@alistair23.me>
---
 .../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

[PATCH v2 3/6] touchscreen/wacom_i2c: Add support for distance and tilt x/y

[Alistair Francis]

This is based on the out of tree rM2 driver.

Signed-off-by: Alistair Francis <alistair@alistair23.me>
---
 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

[PATCH v2 4/6] touchscreen/wacom_i2c: Clean up the query device fields

[Alistair Francis]

Improve the query device fields to be more verbose.

Signed-off-by: Alistair Francis <alistair@alistair23.me>
---
 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

[PATCH v2 5/6] touchscreen/wacom_i2c: Add support for vdd regulator

[Alistair Francis]

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

Signed-off-by: Alistair Francis <alistair@alistair23.me>
---
 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

[PATCH v2 6/6] arch/arm: reMarkable2: Enable wacom_i2c

[Alistair Francis]

Enable the wacom_i2c touchscreen for the reMarkable2.

Signed-off-by: Alistair Francis <alistair@alistair23.me>
---
 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

Re: [PATCH v2 6/6] arch/arm: reMarkable2: Enable wacom_i2c

[Marco Felsch]

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 <alistair@alistair23.me>
> ---
>  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".

>  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.

> +	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?

> +	};
> +};
> +
>  &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.

> +
>  	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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Re: [PATCH v2 1/6] devicetree/bindings: Initial commit of wacom, wacom-i2c

[Marco Felsch]

Hi,

thnaks for the patch.

On 21-01-20 22:56, Alistair Francis wrote:
> Signed-off-by: Alistair Francis <alistair@alistair23.me>
> ---
>  .../input/touchscreen/wacom,wacom-i2c.yaml    | 44 +++++++++++++++++++
>  .../devicetree/bindings/vendor-prefixes.yaml  |  2 +

This should be splitted into two patches.

Regards,
  Marco


>  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
> 
> 
> 

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Pengutronix e.K.                           |                             |
Steuerwalder Str. 21                       | http://www.pengutronix.de/  |
31137 Hildesheim, Germany                  | Phone: +49-5121-206917-0    |
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Re: [PATCH v2 2/6] input/touchscreen: Add device tree support to wacom_i2c

[Marco Felsch]

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.

> Signed-off-by: Alistair Francis <alistair@alistair23.me>
> ---
>  .../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
> +

Unrelated change.

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

Dito.

>          };
>      };
> 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>

Unrelated change.

>  #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);

Unrelated change, please move it into a sepreate patch.

>  	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);
> +

Unrelated change.

>  	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

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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Pengutronix e.K.                           |                             |
Steuerwalder Str. 21                       | http://www.pengutronix.de/  |
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Re: [PATCH v2 3/6] touchscreen/wacom_i2c: Add support for distance and tilt x/y

[Marco Felsch]

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:
> This is based on the out of tree rM2 driver.
> 
> Signed-off-by: Alistair Francis <alistair@alistair23.me>
> ---
>  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
> 
> 
> 

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

[Marco Felsch]

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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Pengutronix e.K.                           |                             |
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Re: [PATCH v2 6/6] arch/arm: reMarkable2: Enable wacom_i2c

[Alistair Francis]

On Fri, Jan 22, 2021 at 7:32 AM Marco Felsch <m.felsch@pengutronix.de> wrote:
>
> 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 <alistair@alistair23.me>
> > ---
> >  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".
>
> >  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.
>
> > +     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.

I have addressed all your comments.

>
> > +             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

>
> > +     };
> > +};
> > +
> >  &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.
>
> > +
> >       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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