[PATCH v6 0/2] Add support for Imagis touchscreens

[PATCH v6 0/2] Add support for Imagis touchscreens

[Markuss Broks]

Add support for Imagis touchscreens, used on various mobile
devices such as Samsung Galaxy J5 (2015), J3 (2015), J5 (2016).

v2: rebase on top of the correct tree
v3:
- prefix all defines as IST3038C
- use two tabs for all defines
- add missing <linux/regulator/consumer.h> header
- drop ADDR_LEN and DATA_LEN defines; use sizeof(reg_be) instead
- use __be32 type for reg_be
- add a comment about i2c read not being successful on first try
- use "ret" instead of "res" in read_reg function
- don't use the internal __cpu_to_be32 function, use cpu_to_be32 instead
- use "error" instead of "ret" in interrupt handler
- pass the slot state directly, without ternary operator
- drop the dev_err in init_input_dev function
- reorder the functions in _probe so that the chipid command is read as fast 
as possible
- don't use imagis_start in probe
- initialize the irq after the chip is powered
- save the return value in imagis_resume
- drop WIDTH_MAJOR since only TOUCH_MAJOR is reported
- the "chip detected" message is now dev_dbg
- reorder headers so they are in alphabetic order
- use GENMASK to generate masks for getting the X and Y coordinates and touch area
- drop *_pressure from device tree bindings since the driver doesn't
support reporting pressure
- fix the typo with i2c address in device treee bindings (48 instead of 50)
- add IRQF_NO_AUTOEN flag to avoid unbalanced irq enable
v4:
- alphabetically order MAINTAINERS entry
- alphabetically order Kconfig and Makefile
- drop the error message in init_regulators
- disable regulators on probe error
- drop IRQF_TRIGGER_FALLING
- @ is not optional (device tree bindings)
- don't use items for compatible
- add maxItems property to reg, drop the comment
v5:
- compatible enum is not an item of the list, drop "-"
v6:
- add _MS suffix to the delay define, drop the comment
- change the reason for retry comment
- add imagis_power_off and imagis_power_on functions to turn regulators
on and off
- use imagis_power_on/off in imagis_start and imagis_stop as well as in probe function
- use error instead of ret in calls to functions which only return 0 or -errno
- include linux/bits.h
- proper indentation in Kconfig
- drop the dev_dbg chip id message
- MODULE_DEVICE_TABLE(of, ...);
- no extra tabs in i2c_driver struct
- save the return value in imagis_suspend

Markuss Broks (2):
  dt-bindings: input/touchscreen: bindings for Imagis
  Input: add Imagis touchscreen driver

 .../input/touchscreen/imagis,ist3038c.yaml    |  78 +++++
 .../devicetree/bindings/vendor-prefixes.yaml  |   2 +
 MAINTAINERS                                   |   6 +
 drivers/input/touchscreen/Kconfig             |  10 +
 drivers/input/touchscreen/Makefile            |   1 +
 drivers/input/touchscreen/imagis.c            | 329 ++++++++++++++++++
 6 files changed, 426 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/input/touchscreen/imagis,ist3038c.yaml
 create mode 100644 drivers/input/touchscreen/imagis.c

-- 
2.35.0

[PATCH v6 1/2] dt-bindings: input/touchscreen: bindings for Imagis

[Markuss Broks]

This patch adds device-tree bindings for the Imagis
IST3038C touch screen IC.

Signed-off-by: Markuss Broks <markuss.broks@gmail.com>

Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
---
 .../input/touchscreen/imagis,ist3038c.yaml    | 74 +++++++++++++++++++
 .../devicetree/bindings/vendor-prefixes.yaml  |  2 +
 2 files changed, 76 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/input/touchscreen/imagis,ist3038c.yaml

diff --git a/Documentation/devicetree/bindings/input/touchscreen/imagis,ist3038c.yaml b/Documentation/devicetree/bindings/input/touchscreen/imagis,ist3038c.yaml
new file mode 100644
index 000000000000..e3a2b871e50c
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/touchscreen/imagis,ist3038c.yaml
@@ -0,0 +1,74 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/input/touchscreen/imagis,ist3038c.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Imagis IST30XXC family touchscreen controller bindings
+
+maintainers:
+  - Markuss Broks <markuss.broks@gmail.com>
+
+allOf:
+  - $ref: touchscreen.yaml#
+
+properties:
+  $nodename:
+    pattern: "^touchscreen@[0-9a-f]+$"
+
+  compatible:
+    enum:
+      - imagis,ist3038c
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    maxItems: 1
+
+  vdd-supply:
+    description: Power supply regulator for the chip
+
+  vddio-supply:
+    description: Power supply regulator for the I2C bus
+
+  touchscreen-size-x: true
+  touchscreen-size-y: true
+  touchscreen-fuzz-x: true
+  touchscreen-fuzz-y: true
+  touchscreen-inverted-x: true
+  touchscreen-inverted-y: true
+  touchscreen-swapped-x-y: true
+
+additionalProperties: false
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - touchscreen-size-x
+  - touchscreen-size-y
+
+examples:
+  - |
+    #include <dt-bindings/interrupt-controller/irq.h>
+    i2c {
+      #address-cells = <1>;
+      #size-cells = <0>;
+      touchscreen@50 {
+        compatible = "imagis,ist3038c";
+        reg = <0x50>;
+        interrupt-parent = <&gpio>;
+        interrupts = <13 IRQ_TYPE_EDGE_FALLING>;
+        vdd-supply = <&ldo1_reg>;
+        vddio-supply = <&ldo2_reg>;
+        touchscreen-size-x = <720>;
+        touchscreen-size-y = <1280>;
+        touchscreen-fuzz-x = <10>;
+        touchscreen-fuzz-y = <10>;
+        touchscreen-inverted-x;
+        touchscreen-inverted-y;
+      };
+    };
+
+...
diff --git a/Documentation/devicetree/bindings/vendor-prefixes.yaml b/Documentation/devicetree/bindings/vendor-prefixes.yaml
index cdc851e275f1..9357cdc5aef5 100644
--- a/Documentation/devicetree/bindings/vendor-prefixes.yaml
+++ b/Documentation/devicetree/bindings/vendor-prefixes.yaml
@@ -551,6 +551,8 @@ patternProperties:
     description: Ingenieurburo Fur Ic-Technologie (I/F/I)
   "^ilitek,.*":
     description: ILI Technology Corporation (ILITEK)
+  "^imagis,.*":
+    description: Imagis Technologies Co., Ltd.
   "^img,.*":
     description: Imagination Technologies Ltd.
   "^imi,.*":
-- 
2.35.0

[PATCH v6 2/2] Input: add Imagis touchscreen driver

[Markuss Broks]

Add support for the IST3038C touchscreen IC from Imagis, based on
downstream driver. The driver supports multi-touch (10 touch points)
The IST3038C IC supports touch keys, but the support isn't added
because the touch screen used for testing doesn't utilize touch keys.
Looking at the downstream driver, it is possible to add support
for other Imagis ICs of IST30**C series.

Signed-off-by: Markuss Broks <markuss.broks@gmail.com>
---
 MAINTAINERS                        |   6 +
 drivers/input/touchscreen/Kconfig  |  10 +
 drivers/input/touchscreen/Makefile |   1 +
 drivers/input/touchscreen/imagis.c | 347 +++++++++++++++++++++++++++++
 4 files changed, 364 insertions(+)
 create mode 100644 drivers/input/touchscreen/imagis.c

diff --git a/MAINTAINERS b/MAINTAINERS
index a899828a8d4e..3b99c60e9f4b 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -9411,6 +9411,12 @@ M:	Stanislaw Gruszka <stf_xl@wp.pl>
 S:	Maintained
 F:	drivers/usb/atm/ueagle-atm.c
 
+IMAGIS TOUCHSCREEN DRIVER
+M:	Markuss Broks <markuss.broks@gmail.com>
+S:	Maintained
+F:	Documentation/devicetree/bindings/input/touchscreen/imagis,ist3038c.yaml
+F:	drivers/input/touchscreen/imagis.c
+
 IMGTEC ASCII LCD DRIVER
 M:	Paul Burton <paulburton@kernel.org>
 S:	Maintained
diff --git a/drivers/input/touchscreen/Kconfig b/drivers/input/touchscreen/Kconfig
index 2f6adfb7b938..f1414f0ad7af 100644
--- a/drivers/input/touchscreen/Kconfig
+++ b/drivers/input/touchscreen/Kconfig
@@ -638,6 +638,16 @@ config TOUCHSCREEN_MTOUCH
 	  To compile this driver as a module, choose M here: the
 	  module will be called mtouch.
 
+config TOUCHSCREEN_IMAGIS
+	tristate "Imagis touchscreen support"
+	depends on I2C
+	help
+	  Say Y here if you have an Imagis IST30xxC touchscreen.
+	  If unsure, say N.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called imagis.
+
 config TOUCHSCREEN_IMX6UL_TSC
 	tristate "Freescale i.MX6UL touchscreen controller"
 	depends on ((OF && GPIOLIB) || COMPILE_TEST) && HAS_IOMEM
diff --git a/drivers/input/touchscreen/Makefile b/drivers/input/touchscreen/Makefile
index 39a8127cf6a5..557f84fd2075 100644
--- a/drivers/input/touchscreen/Makefile
+++ b/drivers/input/touchscreen/Makefile
@@ -49,6 +49,7 @@ obj-$(CONFIG_TOUCHSCREEN_GOODIX)	+= goodix_ts.o
 obj-$(CONFIG_TOUCHSCREEN_HIDEEP)	+= hideep.o
 obj-$(CONFIG_TOUCHSCREEN_ILI210X)	+= ili210x.o
 obj-$(CONFIG_TOUCHSCREEN_ILITEK)	+= ilitek_ts_i2c.o
+obj-$(CONFIG_TOUCHSCREEN_IMAGIS)	+= imagis.o
 obj-$(CONFIG_TOUCHSCREEN_IMX6UL_TSC)	+= imx6ul_tsc.o
 obj-$(CONFIG_TOUCHSCREEN_INEXIO)	+= inexio.o
 obj-$(CONFIG_TOUCHSCREEN_IPROC)		+= bcm_iproc_tsc.o
diff --git a/drivers/input/touchscreen/imagis.c b/drivers/input/touchscreen/imagis.c
new file mode 100644
index 000000000000..92c6a7e0a15e
--- /dev/null
+++ b/drivers/input/touchscreen/imagis.c
@@ -0,0 +1,347 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <linux/bits.h>
+#include <linux/delay.h>
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/input/mt.h>
+#include <linux/input/touchscreen.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/property.h>
+#include <linux/regulator/consumer.h>
+
+#define IST3038C_HIB_ACCESS		(0x800B << 16)
+#define IST3038C_DIRECT_ACCESS		BIT(31)
+#define IST3038C_REG_CHIPID		0x40001000
+#define IST3038C_REG_HIB_BASE		0x30000100
+#define IST3038C_REG_TOUCH_STATUS		(IST3038C_REG_HIB_BASE | IST3038C_HIB_ACCESS)
+#define IST3038C_REG_TOUCH_COORD		(IST3038C_REG_HIB_BASE | IST3038C_HIB_ACCESS | 0x8)
+#define IST3038C_REG_INTR_MESSAGE		(IST3038C_REG_HIB_BASE | IST3038C_HIB_ACCESS | 0x4)
+#define IST3038C_WHOAMI			0x38c
+#define IST3038C_CHIP_ON_DELAY_MS		60
+#define IST3038C_I2C_RETRY_COUNT		3
+#define IST3038C_MAX_SUPPORTED_FINGER_NUM		10
+#define IST3038C_X_MASK		GENMASK(23, 12)
+#define IST3038C_X_SHIFT		12
+#define IST3038C_Y_MASK		GENMASK(11, 0)
+#define IST3038C_AREA_MASK		GENMASK(27, 24)
+#define IST3038C_AREA_SHIFT		24
+#define IST3038C_FINGER_COUNT_MASK		GENMASK(15, 12)
+#define IST3038C_FINGER_COUNT_SHIFT		12
+#define IST3038C_FINGER_STATUS_MASK		GENMASK(9, 0)
+
+struct imagis_ts {
+	struct i2c_client *client;
+	struct input_dev *input_dev;
+	struct touchscreen_properties prop;
+	struct regulator_bulk_data supplies[2];
+};
+
+static int imagis_i2c_read_reg(struct imagis_ts *ts,
+			       unsigned int reg, unsigned int *buffer)
+{
+	__be32 reg_be = cpu_to_be32(reg);
+	struct i2c_msg msg[] = {
+		{
+			.addr = ts->client->addr,
+			.flags = 0,
+			.buf = (unsigned char *)&reg_be,
+			.len = sizeof(reg_be),
+		}, {
+			.addr = ts->client->addr,
+			.flags = I2C_M_RD,
+			.buf = (unsigned char *)buffer,
+			.len = sizeof(reg_be),
+		},
+	};
+	int ret, error;
+	int retry = IST3038C_I2C_RETRY_COUNT;
+
+	/* Retry in case the controller fails to respond */
+	do {
+		ret = i2c_transfer(ts->client->adapter, msg, ARRAY_SIZE(msg));
+		if (ret == ARRAY_SIZE(msg)) {
+			*buffer = be32_to_cpu(*buffer);
+			return 0;
+		}
+
+		error = ret < 0 ? ret : -EIO;
+		dev_err(&ts->client->dev,
+			"%s - i2c_transfer failed: %d (%d)\n",
+			__func__, error, ret);
+	} while (--retry);
+
+	return error;
+}
+
+static irqreturn_t imagis_interrupt(int irq, void *dev_id)
+{
+	struct imagis_ts *ts = dev_id;
+	unsigned int finger_status, intr_message;
+	int error, i, finger_count, finger_pressed;
+
+	error = imagis_i2c_read_reg(ts, IST3038C_REG_INTR_MESSAGE, &intr_message);
+	if (error) {
+		dev_err(&ts->client->dev, "failed to read the interrupt message\n");
+		return IRQ_HANDLED;
+	}
+
+	finger_count = (intr_message & IST3038C_FINGER_COUNT_MASK) >> IST3038C_FINGER_COUNT_SHIFT;
+	finger_pressed = intr_message & IST3038C_FINGER_STATUS_MASK;
+	if (finger_count > IST3038C_MAX_SUPPORTED_FINGER_NUM) {
+		dev_err(&ts->client->dev, "finger count is more than maximum supported\n");
+		return IRQ_HANDLED;
+	}
+
+	for (i = 0; i < finger_count; i++) {
+		error = imagis_i2c_read_reg(ts, IST3038C_REG_TOUCH_COORD + (i * 4), &finger_status);
+		if (error) {
+			dev_err(&ts->client->dev, "failed to read coordinates for finger %d\n", i);
+			return IRQ_HANDLED;
+		}
+		input_mt_slot(ts->input_dev, i);
+		input_mt_report_slot_state(ts->input_dev, MT_TOOL_FINGER,
+					   finger_pressed & BIT(i));
+		touchscreen_report_pos(ts->input_dev, &ts->prop,
+				       (finger_status & IST3038C_X_MASK) >> IST3038C_X_SHIFT,
+				       finger_status & IST3038C_Y_MASK, 1);
+		input_report_abs(ts->input_dev, ABS_MT_TOUCH_MAJOR,
+				 (finger_status & IST3038C_AREA_MASK) >> IST3038C_AREA_SHIFT);
+	}
+	input_mt_sync_frame(ts->input_dev);
+	input_sync(ts->input_dev);
+
+	return IRQ_HANDLED;
+}
+
+static int imagis_power_off(struct imagis_ts *ts)
+{
+	int error;
+
+	error = regulator_bulk_disable(ARRAY_SIZE(ts->supplies),
+				       ts->supplies);
+	if (error)
+		dev_err(&ts->client->dev,
+			"Failed to disable regulators: %d\n", error);
+	return error;
+}
+
+static int imagis_power_on(struct imagis_ts *ts)
+{
+	int error;
+
+	error = regulator_bulk_enable(ARRAY_SIZE(ts->supplies),
+				      ts->supplies);
+	if (error)
+		dev_err(&ts->client->dev,
+			"Failed to enable regulators: %d\n", error);
+	return error;
+}
+
+static int imagis_start(struct imagis_ts *ts)
+{
+	int error;
+
+	error = imagis_power_on(ts);
+	if (error)
+		return error;
+
+	msleep(IST3038C_CHIP_ON_DELAY_MS);
+
+	enable_irq(ts->client->irq);
+	return error;
+}
+
+static int imagis_stop(struct imagis_ts *ts)
+{
+	disable_irq(ts->client->irq);
+
+	return imagis_power_off(ts);
+}
+
+static int imagis_input_open(struct input_dev *dev)
+{
+	struct imagis_ts *ts = input_get_drvdata(dev);
+
+	return imagis_start(ts);
+}
+
+static void imagis_input_close(struct input_dev *dev)
+{
+	struct imagis_ts *ts = input_get_drvdata(dev);
+
+	imagis_stop(ts);
+}
+
+static int imagis_init_input_dev(struct imagis_ts *ts)
+{
+	struct input_dev *input_dev;
+	int error;
+
+	input_dev = devm_input_allocate_device(&ts->client->dev);
+	if (!input_dev)
+		return -ENOMEM;
+
+	ts->input_dev = input_dev;
+
+	input_dev->name = "Imagis capacitive touchscreen";
+	input_dev->phys = "input/ts";
+	input_dev->id.bustype = BUS_I2C;
+	input_dev->open = imagis_input_open;
+	input_dev->close = imagis_input_close;
+
+	input_set_drvdata(input_dev, ts);
+
+	input_set_capability(input_dev, EV_ABS, ABS_MT_POSITION_X);
+	input_set_capability(input_dev, EV_ABS, ABS_MT_POSITION_Y);
+	input_set_abs_params(input_dev, ABS_MT_TOUCH_MAJOR, 0, 255, 0, 0);
+
+	touchscreen_parse_properties(input_dev, true, &ts->prop);
+	if (!ts->prop.max_x || !ts->prop.max_y) {
+		dev_err(&ts->client->dev,
+			"Touchscreen-size-x and/or touchscreen-size-y not set in dts\n");
+		return -EINVAL;
+	}
+
+	error = input_mt_init_slots(input_dev, IST3038C_MAX_SUPPORTED_FINGER_NUM,
+				    INPUT_MT_DIRECT | INPUT_MT_DROP_UNUSED);
+	if (error) {
+		dev_err(&ts->client->dev,
+			"Failed to initialize MT slots: %d", error);
+		return error;
+	}
+
+	error = input_register_device(input_dev);
+	if (error) {
+		dev_err(&ts->client->dev,
+			"Failed to register input device: %d", error);
+		return error;
+	}
+
+	return 0;
+}
+
+static int imagis_init_regulators(struct imagis_ts *ts)
+{
+	struct i2c_client *client = ts->client;
+	int error = 0;
+
+	ts->supplies[0].supply = "vdd";
+	ts->supplies[1].supply = "vddio";
+	error = devm_regulator_bulk_get(&client->dev,
+					ARRAY_SIZE(ts->supplies),
+					ts->supplies);
+
+	return error;
+}
+
+static int imagis_probe(struct i2c_client *i2c)
+{
+	struct device *dev;
+	struct imagis_ts *ts;
+	int chip_id, ret, error;
+
+	dev = &i2c->dev;
+
+	ts = devm_kzalloc(dev, sizeof(*ts), GFP_KERNEL);
+	if (!ts)
+		return -ENOMEM;
+
+	ts->client = i2c;
+
+	error = imagis_init_regulators(ts);
+	if (error)
+		return dev_err_probe(dev, error, "regulator init error: %d\n", error);
+
+	error = imagis_power_on(ts);
+	if (error)
+		return dev_err_probe(dev, error, "failed to enable regulators: %d\n", error);
+
+	msleep(IST3038C_CHIP_ON_DELAY_MS);
+
+	ret = imagis_i2c_read_reg(ts, IST3038C_REG_CHIPID | IST3038C_DIRECT_ACCESS, &chip_id);
+	if (ret) {
+		imagis_power_off(ts);
+		return dev_err_probe(dev, error, "chip ID read failure: %d\n", ret);
+	}
+
+	if (chip_id != IST3038C_WHOAMI) {
+		imagis_power_off(ts);
+		return dev_err_probe(dev, -EINVAL, "unknown chip ID: 0x%x\n", chip_id);
+	}
+
+	error = devm_request_threaded_irq(dev, i2c->irq,
+					  NULL, imagis_interrupt,
+					  IRQF_ONESHOT | IRQF_NO_AUTOEN,
+					  "imagis-touchscreen", ts);
+	if (error) {
+		imagis_power_off(ts);
+		return dev_err_probe(dev, error, "IRQ allocation failure: %d\n", error);
+	}
+
+	error = imagis_init_input_dev(ts);
+	if (error) {
+		imagis_power_off(ts);
+		return dev_err_probe(dev, error, "input subsystem init error: %d\n", error);
+	}
+
+	return 0;
+}
+
+static int __maybe_unused imagis_suspend(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct imagis_ts *ts = i2c_get_clientdata(client);
+	int ret;
+
+	mutex_lock(&ts->input_dev->mutex);
+
+	if (input_device_enabled(ts->input_dev))
+		ret = imagis_stop(ts);
+
+	mutex_unlock(&ts->input_dev->mutex);
+
+	return ret;
+}
+
+static int __maybe_unused imagis_resume(struct device *dev)
+{
+	struct i2c_client *client = to_i2c_client(dev);
+	struct imagis_ts *ts = i2c_get_clientdata(client);
+	int ret;
+
+	mutex_lock(&ts->input_dev->mutex);
+
+	if (input_device_enabled(ts->input_dev))
+		ret = imagis_start(ts);
+
+	mutex_unlock(&ts->input_dev->mutex);
+
+	return ret;
+}
+
+static SIMPLE_DEV_PM_OPS(imagis_pm_ops, imagis_suspend, imagis_resume);
+
+#ifdef CONFIG_OF
+static const struct of_device_id imagis_of_match[] = {
+	{ .compatible = "imagis,ist3038c", },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, imagis_of_match);
+#endif
+
+static struct i2c_driver imagis_ts_driver = {
+	.driver = {
+		.name = "imagis-touchscreen",
+		.pm = &imagis_pm_ops,
+		.of_match_table = of_match_ptr(imagis_of_match),
+	},
+	.probe_new = imagis_probe,
+};
+
+module_i2c_driver(imagis_ts_driver);
+
+MODULE_DESCRIPTION("Imagis IST3038C Touchscreen Driver");
+MODULE_AUTHOR("Markuss Broks <markuss.broks@gmail.com>");
+MODULE_LICENSE("GPL");
-- 
2.35.0

Re: [PATCH v6 2/2] Input: add Imagis touchscreen driver

[kernel test robot]

Hi Markuss,

I love your patch! Perhaps something to improve:

[auto build test WARNING on dtor-input/next]
[also build test WARNING on linux/master robh/for-next linus/master v5.17-rc5 next-20220222]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Markuss-Broks/Add-support-for-Imagis-touchscreens/20220223-043645
base:   https://git.kernel.org/pub/scm/linux/kernel/git/dtor/input.git next
config: hexagon-allyesconfig (https://download.01.org/0day-ci/archive/20220223/202202231213.Vj9yo4tW-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project d271fc04d5b97b12e6b797c6067d3c96a8d7470e)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/0day-ci/linux/commit/bc77ee5e0d7309edca7d65925c6afa05334b0b01
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Markuss-Broks/Add-support-for-Imagis-touchscreens/20220223-043645
        git checkout bc77ee5e0d7309edca7d65925c6afa05334b0b01
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=hexagon SHELL=/bin/bash drivers/input/touchscreen/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> drivers/input/touchscreen/imagis.c:300:6: warning: variable 'ret' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]
           if (input_device_enabled(ts->input_dev))
               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/input/touchscreen/imagis.c:305:9: note: uninitialized use occurs here
           return ret;
                  ^~~
   drivers/input/touchscreen/imagis.c:300:2: note: remove the 'if' if its condition is always true
           if (input_device_enabled(ts->input_dev))
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/input/touchscreen/imagis.c:296:9: note: initialize the variable 'ret' to silence this warning
           int ret;
                  ^
                   = 0
   drivers/input/touchscreen/imagis.c:316:6: warning: variable 'ret' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]
           if (input_device_enabled(ts->input_dev))
               ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/input/touchscreen/imagis.c:321:9: note: uninitialized use occurs here
           return ret;
                  ^~~
   drivers/input/touchscreen/imagis.c:316:2: note: remove the 'if' if its condition is always true
           if (input_device_enabled(ts->input_dev))
           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   drivers/input/touchscreen/imagis.c:312:9: note: initialize the variable 'ret' to silence this warning
           int ret;
                  ^
                   = 0
   2 warnings generated.


vim +300 drivers/input/touchscreen/imagis.c

   291	
   292	static int __maybe_unused imagis_suspend(struct device *dev)
   293	{
   294		struct i2c_client *client = to_i2c_client(dev);
   295		struct imagis_ts *ts = i2c_get_clientdata(client);
   296		int ret;
   297	
   298		mutex_lock(&ts->input_dev->mutex);
   299	
 > 300		if (input_device_enabled(ts->input_dev))
   301			ret = imagis_stop(ts);
   302	
   303		mutex_unlock(&ts->input_dev->mutex);
   304	
   305		return ret;
   306	}
   307	

---
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Re: [PATCH v6 1/2] dt-bindings: input/touchscreen: bindings for Imagis

[Krzysztof Kozlowski]

On 22/02/2022 21:34, Markuss Broks wrote:
> This patch adds device-tree bindings for the Imagis
> IST3038C touch screen IC.
> 
> Signed-off-by: Markuss Broks <markuss.broks@gmail.com>
> 
> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>

No need for blank line between tags. I guess this can be fixed when
applied, but if there is a resend - please correct it.


Best regards,
Krzysztof

Re: [PATCH v6 2/2] Input: add Imagis touchscreen driver

[kernel test robot]

Hi Markuss,

I love your patch! Perhaps something to improve:

[auto build test WARNING on dtor-input/next]
[also build test WARNING on linux/master robh/for-next linus/master v5.17-rc5 next-20220222]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Markuss-Broks/Add-support-for-Imagis-touchscreens/20220223-043645
base:   https://git.kernel.org/pub/scm/linux/kernel/git/dtor/input.git next
config: arm-randconfig-s031-20220223 (https://download.01.org/0day-ci/archive/20220223/202202232342.Ew209GPR-lkp@intel.com/config)
compiler: arm-linux-gnueabi-gcc (GCC) 11.2.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # apt-get install sparse
        # sparse version: v0.6.4-dirty
        # https://github.com/0day-ci/linux/commit/bc77ee5e0d7309edca7d65925c6afa05334b0b01
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Markuss-Broks/Add-support-for-Imagis-touchscreens/20220223-043645
        git checkout bc77ee5e0d7309edca7d65925c6afa05334b0b01
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=arm SHELL=/bin/bash drivers/input/touchscreen/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>


sparse warnings: (new ones prefixed by >>)
>> drivers/input/touchscreen/imagis.c:65:35: sparse: sparse: cast to restricted __be32

vim +65 drivers/input/touchscreen/imagis.c

    40	
    41	static int imagis_i2c_read_reg(struct imagis_ts *ts,
    42				       unsigned int reg, unsigned int *buffer)
    43	{
    44		__be32 reg_be = cpu_to_be32(reg);
    45		struct i2c_msg msg[] = {
    46			{
    47				.addr = ts->client->addr,
    48				.flags = 0,
    49				.buf = (unsigned char *)&reg_be,
    50				.len = sizeof(reg_be),
    51			}, {
    52				.addr = ts->client->addr,
    53				.flags = I2C_M_RD,
    54				.buf = (unsigned char *)buffer,
    55				.len = sizeof(reg_be),
    56			},
    57		};
    58		int ret, error;
    59		int retry = IST3038C_I2C_RETRY_COUNT;
    60	
    61		/* Retry in case the controller fails to respond */
    62		do {
    63			ret = i2c_transfer(ts->client->adapter, msg, ARRAY_SIZE(msg));
    64			if (ret == ARRAY_SIZE(msg)) {
  > 65				*buffer = be32_to_cpu(*buffer);
    66				return 0;
    67			}
    68	
    69			error = ret < 0 ? ret : -EIO;
    70			dev_err(&ts->client->dev,
    71				"%s - i2c_transfer failed: %d (%d)\n",
    72				__func__, error, ret);
    73		} while (--retry);
    74	
    75		return error;
    76	}
    77	

---
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Re: [PATCH v6 1/2] dt-bindings: input/touchscreen: bindings for Imagis

[Rob Herring]

On Tue, 22 Feb 2022 22:34:10 +0200, Markuss Broks wrote:
> This patch adds device-tree bindings for the Imagis
> IST3038C touch screen IC.
> 
> Signed-off-by: Markuss Broks <markuss.broks@gmail.com>
> 
> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
> ---
>  .../input/touchscreen/imagis,ist3038c.yaml    | 74 +++++++++++++++++++
>  .../devicetree/bindings/vendor-prefixes.yaml  |  2 +
>  2 files changed, 76 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/input/touchscreen/imagis,ist3038c.yaml
> 

Acked-by: Rob Herring <robh@kernel.org>

Re: [PATCH v6 2/2] Input: add Imagis touchscreen driver

[kernel test robot]

[-- Attachment #1: Type: text/plain, Size: 4232 bytes --]

CC: kbuild-all(a)lists.01.org
BCC: lkp(a)intel.com
In-Reply-To: <20220222203414.8656-3-markuss.broks@gmail.com>
References: <20220222203414.8656-3-markuss.broks@gmail.com>
TO: Markuss Broks <markuss.broks@gmail.com>
TO: linux-kernel(a)vger.kernel.org
CC: phone-devel(a)vger.kernel.org
CC: ~postmarketos/upstreaming(a)lists.sr.ht
CC: Markuss Broks <markuss.broks@gmail.com>
CC: Dmitry Torokhov <dmitry.torokhov@gmail.com>
CC: Rob Herring <robh+dt@kernel.org>
CC: Krzysztof Kozlowski <krzk@kernel.org>
CC: Henrik Rydberg <rydberg@bitmath.org>
CC: linux-input(a)vger.kernel.org
CC: devicetree(a)vger.kernel.org

Hi Markuss,

I love your patch! Perhaps something to improve:

[auto build test WARNING on dtor-input/next]
[also build test WARNING on linux/master robh/for-next linus/master v5.17-rc5 next-20220223]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Markuss-Broks/Add-support-for-Imagis-touchscreens/20220223-043645
base:   https://git.kernel.org/pub/scm/linux/kernel/git/dtor/input.git next
:::::: branch date: 2 days ago
:::::: commit date: 2 days ago
config: microblaze-randconfig-m031-20220224 (https://download.01.org/0day-ci/archive/20220225/202202250109.qr1l07ts-lkp(a)intel.com/config)
compiler: microblaze-linux-gcc (GCC) 11.2.0

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>

smatch warnings:
drivers/input/touchscreen/imagis.c:305 imagis_suspend() error: uninitialized symbol 'ret'.
drivers/input/touchscreen/imagis.c:321 imagis_resume() error: uninitialized symbol 'ret'.

vim +/ret +305 drivers/input/touchscreen/imagis.c

bc77ee5e0d7309 Markuss Broks 2022-02-22  291  
bc77ee5e0d7309 Markuss Broks 2022-02-22  292  static int __maybe_unused imagis_suspend(struct device *dev)
bc77ee5e0d7309 Markuss Broks 2022-02-22  293  {
bc77ee5e0d7309 Markuss Broks 2022-02-22  294  	struct i2c_client *client = to_i2c_client(dev);
bc77ee5e0d7309 Markuss Broks 2022-02-22  295  	struct imagis_ts *ts = i2c_get_clientdata(client);
bc77ee5e0d7309 Markuss Broks 2022-02-22  296  	int ret;
bc77ee5e0d7309 Markuss Broks 2022-02-22  297  
bc77ee5e0d7309 Markuss Broks 2022-02-22  298  	mutex_lock(&ts->input_dev->mutex);
bc77ee5e0d7309 Markuss Broks 2022-02-22  299  
bc77ee5e0d7309 Markuss Broks 2022-02-22  300  	if (input_device_enabled(ts->input_dev))
bc77ee5e0d7309 Markuss Broks 2022-02-22  301  		ret = imagis_stop(ts);
bc77ee5e0d7309 Markuss Broks 2022-02-22  302  
bc77ee5e0d7309 Markuss Broks 2022-02-22  303  	mutex_unlock(&ts->input_dev->mutex);
bc77ee5e0d7309 Markuss Broks 2022-02-22  304  
bc77ee5e0d7309 Markuss Broks 2022-02-22 @305  	return ret;
bc77ee5e0d7309 Markuss Broks 2022-02-22  306  }
bc77ee5e0d7309 Markuss Broks 2022-02-22  307  
bc77ee5e0d7309 Markuss Broks 2022-02-22  308  static int __maybe_unused imagis_resume(struct device *dev)
bc77ee5e0d7309 Markuss Broks 2022-02-22  309  {
bc77ee5e0d7309 Markuss Broks 2022-02-22  310  	struct i2c_client *client = to_i2c_client(dev);
bc77ee5e0d7309 Markuss Broks 2022-02-22  311  	struct imagis_ts *ts = i2c_get_clientdata(client);
bc77ee5e0d7309 Markuss Broks 2022-02-22  312  	int ret;
bc77ee5e0d7309 Markuss Broks 2022-02-22  313  
bc77ee5e0d7309 Markuss Broks 2022-02-22  314  	mutex_lock(&ts->input_dev->mutex);
bc77ee5e0d7309 Markuss Broks 2022-02-22  315  
bc77ee5e0d7309 Markuss Broks 2022-02-22  316  	if (input_device_enabled(ts->input_dev))
bc77ee5e0d7309 Markuss Broks 2022-02-22  317  		ret = imagis_start(ts);
bc77ee5e0d7309 Markuss Broks 2022-02-22  318  
bc77ee5e0d7309 Markuss Broks 2022-02-22  319  	mutex_unlock(&ts->input_dev->mutex);
bc77ee5e0d7309 Markuss Broks 2022-02-22  320  
bc77ee5e0d7309 Markuss Broks 2022-02-22 @321  	return ret;
bc77ee5e0d7309 Markuss Broks 2022-02-22  322  }
bc77ee5e0d7309 Markuss Broks 2022-02-22  323  

---
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Re: [PATCH v6 2/2] Input: add Imagis touchscreen driver

[Dan Carpenter]

Hi Markuss,

url:    https://github.com/0day-ci/linux/commits/Markuss-Broks/Add-support-for-Imagis-touchscreens/20220223-043645
base:   https://git.kernel.org/pub/scm/linux/kernel/git/dtor/input.git next
config: microblaze-randconfig-m031-20220224 (https://download.01.org/0day-ci/archive/20220225/202202250109.qr1l07ts-lkp@intel.com/config)
compiler: microblaze-linux-gcc (GCC) 11.2.0

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>

smatch warnings:
drivers/input/touchscreen/imagis.c:305 imagis_suspend() error: uninitialized symbol 'ret'.
drivers/input/touchscreen/imagis.c:321 imagis_resume() error: uninitialized symbol 'ret'.

vim +/ret +305 drivers/input/touchscreen/imagis.c

bc77ee5e0d7309 Markuss Broks 2022-02-22  292  static int __maybe_unused imagis_suspend(struct device *dev)
bc77ee5e0d7309 Markuss Broks 2022-02-22  293  {
bc77ee5e0d7309 Markuss Broks 2022-02-22  294  	struct i2c_client *client = to_i2c_client(dev);
bc77ee5e0d7309 Markuss Broks 2022-02-22  295  	struct imagis_ts *ts = i2c_get_clientdata(client);
bc77ee5e0d7309 Markuss Broks 2022-02-22  296  	int ret;
bc77ee5e0d7309 Markuss Broks 2022-02-22  297  
bc77ee5e0d7309 Markuss Broks 2022-02-22  298  	mutex_lock(&ts->input_dev->mutex);
bc77ee5e0d7309 Markuss Broks 2022-02-22  299  
bc77ee5e0d7309 Markuss Broks 2022-02-22  300  	if (input_device_enabled(ts->input_dev))
bc77ee5e0d7309 Markuss Broks 2022-02-22  301  		ret = imagis_stop(ts);

"ret" not initialized on else path.

bc77ee5e0d7309 Markuss Broks 2022-02-22  302  
bc77ee5e0d7309 Markuss Broks 2022-02-22  303  	mutex_unlock(&ts->input_dev->mutex);
bc77ee5e0d7309 Markuss Broks 2022-02-22  304  
bc77ee5e0d7309 Markuss Broks 2022-02-22 @305  	return ret;
bc77ee5e0d7309 Markuss Broks 2022-02-22  306  }
bc77ee5e0d7309 Markuss Broks 2022-02-22  307  
bc77ee5e0d7309 Markuss Broks 2022-02-22  308  static int __maybe_unused imagis_resume(struct device *dev)
bc77ee5e0d7309 Markuss Broks 2022-02-22  309  {
bc77ee5e0d7309 Markuss Broks 2022-02-22  310  	struct i2c_client *client = to_i2c_client(dev);
bc77ee5e0d7309 Markuss Broks 2022-02-22  311  	struct imagis_ts *ts = i2c_get_clientdata(client);
bc77ee5e0d7309 Markuss Broks 2022-02-22  312  	int ret;
bc77ee5e0d7309 Markuss Broks 2022-02-22  313  
bc77ee5e0d7309 Markuss Broks 2022-02-22  314  	mutex_lock(&ts->input_dev->mutex);
bc77ee5e0d7309 Markuss Broks 2022-02-22  315  
bc77ee5e0d7309 Markuss Broks 2022-02-22  316  	if (input_device_enabled(ts->input_dev))
bc77ee5e0d7309 Markuss Broks 2022-02-22  317  		ret = imagis_start(ts);

same.

bc77ee5e0d7309 Markuss Broks 2022-02-22  318  
bc77ee5e0d7309 Markuss Broks 2022-02-22  319  	mutex_unlock(&ts->input_dev->mutex);
bc77ee5e0d7309 Markuss Broks 2022-02-22  320  
bc77ee5e0d7309 Markuss Broks 2022-02-22 @321  	return ret;
bc77ee5e0d7309 Markuss Broks 2022-02-22  322  }

---
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Re: [PATCH v6 2/2] Input: add Imagis touchscreen driver

[Dan Carpenter]

[-- Attachment #1: Type: text/plain, Size: 3118 bytes --]

Hi Markuss,

url:    https://github.com/0day-ci/linux/commits/Markuss-Broks/Add-support-for-Imagis-touchscreens/20220223-043645
base:   https://git.kernel.org/pub/scm/linux/kernel/git/dtor/input.git next
config: microblaze-randconfig-m031-20220224 (https://download.01.org/0day-ci/archive/20220225/202202250109.qr1l07ts-lkp(a)intel.com/config)
compiler: microblaze-linux-gcc (GCC) 11.2.0

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>

smatch warnings:
drivers/input/touchscreen/imagis.c:305 imagis_suspend() error: uninitialized symbol 'ret'.
drivers/input/touchscreen/imagis.c:321 imagis_resume() error: uninitialized symbol 'ret'.

vim +/ret +305 drivers/input/touchscreen/imagis.c

bc77ee5e0d7309 Markuss Broks 2022-02-22  292  static int __maybe_unused imagis_suspend(struct device *dev)
bc77ee5e0d7309 Markuss Broks 2022-02-22  293  {
bc77ee5e0d7309 Markuss Broks 2022-02-22  294  	struct i2c_client *client = to_i2c_client(dev);
bc77ee5e0d7309 Markuss Broks 2022-02-22  295  	struct imagis_ts *ts = i2c_get_clientdata(client);
bc77ee5e0d7309 Markuss Broks 2022-02-22  296  	int ret;
bc77ee5e0d7309 Markuss Broks 2022-02-22  297  
bc77ee5e0d7309 Markuss Broks 2022-02-22  298  	mutex_lock(&ts->input_dev->mutex);
bc77ee5e0d7309 Markuss Broks 2022-02-22  299  
bc77ee5e0d7309 Markuss Broks 2022-02-22  300  	if (input_device_enabled(ts->input_dev))
bc77ee5e0d7309 Markuss Broks 2022-02-22  301  		ret = imagis_stop(ts);

"ret" not initialized on else path.

bc77ee5e0d7309 Markuss Broks 2022-02-22  302  
bc77ee5e0d7309 Markuss Broks 2022-02-22  303  	mutex_unlock(&ts->input_dev->mutex);
bc77ee5e0d7309 Markuss Broks 2022-02-22  304  
bc77ee5e0d7309 Markuss Broks 2022-02-22 @305  	return ret;
bc77ee5e0d7309 Markuss Broks 2022-02-22  306  }
bc77ee5e0d7309 Markuss Broks 2022-02-22  307  
bc77ee5e0d7309 Markuss Broks 2022-02-22  308  static int __maybe_unused imagis_resume(struct device *dev)
bc77ee5e0d7309 Markuss Broks 2022-02-22  309  {
bc77ee5e0d7309 Markuss Broks 2022-02-22  310  	struct i2c_client *client = to_i2c_client(dev);
bc77ee5e0d7309 Markuss Broks 2022-02-22  311  	struct imagis_ts *ts = i2c_get_clientdata(client);
bc77ee5e0d7309 Markuss Broks 2022-02-22  312  	int ret;
bc77ee5e0d7309 Markuss Broks 2022-02-22  313  
bc77ee5e0d7309 Markuss Broks 2022-02-22  314  	mutex_lock(&ts->input_dev->mutex);
bc77ee5e0d7309 Markuss Broks 2022-02-22  315  
bc77ee5e0d7309 Markuss Broks 2022-02-22  316  	if (input_device_enabled(ts->input_dev))
bc77ee5e0d7309 Markuss Broks 2022-02-22  317  		ret = imagis_start(ts);

same.

bc77ee5e0d7309 Markuss Broks 2022-02-22  318  
bc77ee5e0d7309 Markuss Broks 2022-02-22  319  	mutex_unlock(&ts->input_dev->mutex);
bc77ee5e0d7309 Markuss Broks 2022-02-22  320  
bc77ee5e0d7309 Markuss Broks 2022-02-22 @321  	return ret;
bc77ee5e0d7309 Markuss Broks 2022-02-22  322  }

---
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