[PATCH v1 0/2] input: misc: add support for Imagis ISA1200 haptic motor driver

[PATCH v1 0/2] input: misc: add support for Imagis ISA1200 haptic motor driver

[Svyatoslav Ryhel]

The ISA1200 is a haptic feedback unit from Imagis Technology using two
motors for haptic feedback in mobile phones. Used in many mobile devices
c. 2012 including Samsung Galxy S Advance GT-I9070 (Janice), Samsung Beam
GT-I8350 (Gavini), LG Optimus 4X P880 and LG Optimus Vu P895.

The exact datasheet for the ISA1200 is not available; all data was modeled
based on available downstream kernel sources for various devices and
fragments of information scattered across the internet.

Linus Walleij (1):
  Input: isa1200 - new driver for Imagis ISA1200

Svyatoslav Ryhel (1):
  dt-bindings: input: Document Imagis ISA1200 haptic motor driver

 .../bindings/input/imagis,isa1200.yaml        | 145 ++++++
 drivers/input/misc/Kconfig                    |  11 +
 drivers/input/misc/Makefile                   |   1 +
 drivers/input/misc/isa1200.c                  | 459 ++++++++++++++++++
 include/dt-bindings/input/isa1200.h           |  16 +
 5 files changed, 632 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/input/imagis,isa1200.yaml
 create mode 100644 drivers/input/misc/isa1200.c
 create mode 100644 include/dt-bindings/input/isa1200.h

-- 
2.51.0

[PATCH v1 1/2] dt-bindings: input: Document Imagis ISA1200 haptic motor driver

[Svyatoslav Ryhel]

Document the Imagis ISA1200 haptic motor driver, used primarily in mobile
handheld devices and capable of supporting up to two motors.

The exact datasheet for the ISA1200 is not available; all data was modeled
based on available downstream kernel sources for various devices and
fragments of information scattered across the internet.

Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
---
 .../bindings/input/imagis,isa1200.yaml        | 145 ++++++++++++++++++
 include/dt-bindings/input/isa1200.h           |  16 ++
 2 files changed, 161 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/input/imagis,isa1200.yaml
 create mode 100644 include/dt-bindings/input/isa1200.h

diff --git a/Documentation/devicetree/bindings/input/imagis,isa1200.yaml b/Documentation/devicetree/bindings/input/imagis,isa1200.yaml
new file mode 100644
index 000000000000..51767fd8189d
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/imagis,isa1200.yaml
@@ -0,0 +1,145 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/input/imagis,isa1200.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Imagis ISA1200 haptic motor driver
+
+maintainers:
+  - Svyatoslav Ryhel <clamor95@gmail.com>
+  - Linus Walleij <linusw@kernel.org>
+
+description:
+  The ISA1200 is a high-performance enhanced haptic motor driver designed
+  for mobile hand-held devices. It supports various voltages for both ERM
+  (Eccentric Rotating Mass) and LRA (Linear Resonant Actuator) type
+  actuators. Thanks to an embedded LDO, battery power can be used directly
+  in handheld applications.
+
+properties:
+  compatible:
+    const: imagis,isa1200
+
+  reg:
+    maxItems: 1
+
+  enable-gpios:
+    description:
+      One or two GPIOs flagged as active high linked to HEN and LEN pins
+    maxItems: 2
+
+  clocks:
+    maxItems: 1
+
+  pwms:
+    maxItems: 1
+
+  vdd-supply:
+    description:
+      Regulator for 2.4V - 5.5V power supply
+
+  vddp-supply:
+    description:
+      Regulator for 2.4V - 3.6V IO power supply
+
+  imagis,clk-div:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description: |
+      Divider for the external input clock/PWM
+      0 - 128
+      1 - 256
+      2 - 512
+      3 - 1024
+    enum: [0, 1, 2, 3]
+    default: 0
+
+  imagis,pll-div:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      Divider for the internal PLL clock
+    minimum: 1
+    maximum: 15
+    default: 1
+
+  imagis,mode:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      Defines the motor type isa1200 drives
+      0 - LRA (Linear Resonant Actuator)
+      1 - ERM (Eccentric Rotating Mass)
+    enum: [0, 1]
+    default: 0
+
+  imagis,period-ns:
+    description:
+      Period of the internal PWM channel in nanoseconds.
+    minimum: 128
+    maximum: 254
+
+  imagis,duty-cycle-ns:
+    description:
+      Duty cycle of the external/internal PWM channel in nanoseconds,
+      defaults to 50% of the channel's period
+
+  ldo:
+    $ref: /schemas/regulator/regulator.yaml#
+    type: object
+    description:
+      Embedded LDO regulator with voltage range 2.3V - 3.8V
+    unevaluatedProperties: false
+
+    required:
+      - regulator-min-microvolt
+      - regulator-max-microvolt
+
+required:
+  - compatible
+  - reg
+  - ldo
+
+anyOf:
+  - required:
+      - clocks
+      - imagis,period-ns
+  - required:
+      - pwms
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/input/isa1200.h>
+
+    i2c {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        haptic-engine@49 {
+            compatible = "imagis,isa1200";
+            reg = <0x49>;
+
+            clocks = <&isa1200_refclk>;
+
+            enable-gpios = <&gpio 22 GPIO_ACTIVE_HIGH>,
+                           <&gpio 23 GPIO_ACTIVE_HIGH>;
+
+            vdd-supply = <&vdd_3v3_vbat>;
+            vddp-supply = <&vdd_2v8_vvib>;
+
+            imagis,clk-div = <ISA1200_CKLDIV_256>;
+            imagis,pll-div = <2>;
+
+            imagis,mode = <ISA1200_LRA_MODE>;
+
+            imagis,period-ns = <134>;
+            imagis,duty-cycle-ns = <100>;
+
+            ldo {
+                regulator-name = "vdd_vib";
+                regulator-min-microvolt = <2300000>;
+                regulator-max-microvolt = <2300000>;
+            };
+        };
+    };
diff --git a/include/dt-bindings/input/isa1200.h b/include/dt-bindings/input/isa1200.h
new file mode 100644
index 000000000000..cbae47ccf99b
--- /dev/null
+++ b/include/dt-bindings/input/isa1200.h
@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause */
+
+#ifndef _DT_BINDINGS_ISA1200_H
+#define _DT_BINDINGS_ISA1200_H
+
+/* Linked actuator type */
+#define ISA1200_LRA_MODE		0
+#define ISA1200_ERM_MODE		1
+
+/* External clock divider */
+#define ISA1200_CKLDIV_128		0
+#define ISA1200_CKLDIV_256		1
+#define ISA1200_CKLDIV_512		2
+#define ISA1200_CKLDIV_1024		3
+
+#endif
-- 
2.51.0

Re: [PATCH v1 1/2] dt-bindings: input: Document Imagis ISA1200 haptic motor driver

[Linus Walleij]

On Fri, Apr 24, 2026 at 9:13 AM Svyatoslav Ryhel <clamor95@gmail.com> wrote:

> Document the Imagis ISA1200 haptic motor driver, used primarily in mobile
> handheld devices and capable of supporting up to two motors.
>
> The exact datasheet for the ISA1200 is not available; all data was modeled
> based on available downstream kernel sources for various devices and
> fragments of information scattered across the internet.
>
> Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>

DT binding maintainers: notice that this version is essentially a reply to
requested changes from Rob in 2022:
https://lore.kernel.org/linux-input/YjuaK09nOztYOmyn@robh.at.kernel.org/

I.e. moving from "all info derived from the compatible" to "use more
properties".

Yours,
Linus Walleij

Re: [PATCH v1 1/2] dt-bindings: input: Document Imagis ISA1200 haptic motor driver

[Rob Herring (Arm)]

On Fri, 24 Apr 2026 10:13:04 +0300, Svyatoslav Ryhel wrote:
> Document the Imagis ISA1200 haptic motor driver, used primarily in mobile
> handheld devices and capable of supporting up to two motors.
> 
> The exact datasheet for the ISA1200 is not available; all data was modeled
> based on available downstream kernel sources for various devices and
> fragments of information scattered across the internet.
> 
> Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
> ---
>  .../bindings/input/imagis,isa1200.yaml        | 145 ++++++++++++++++++
>  include/dt-bindings/input/isa1200.h           |  16 ++
>  2 files changed, 161 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/input/imagis,isa1200.yaml
>  create mode 100644 include/dt-bindings/input/isa1200.h
> 

My bot found errors running 'make dt_binding_check' on your patch:

yamllint warnings/errors:

dtschema/dtc warnings/errors:
/builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/input/imagis,isa1200.example.dtb: haptic-engine@49 (imagis,isa1200): enable-gpios: [[4294967295, 22, 0], [4294967295, 23, 0]] is too long
	from schema $id: http://devicetree.org/schemas/gpio/gpio-consumer-common.yaml

doc reference errors (make refcheckdocs):

See https://patchwork.kernel.org/project/devicetree/patch/20260424071305.89503-2-clamor95@gmail.com

The base for the series is generally the latest rc1. A different dependency
should be noted in *this* patch.

If you already ran 'make dt_binding_check' and didn't see the above
error(s), then make sure 'yamllint' is installed and dt-schema is up to
date:

pip3 install dtschema --upgrade

Please check and re-submit after running the above command yourself. Note
that DT_SCHEMA_FILES can be set to your schema file to speed up checking
your schema. However, it must be unset to test all examples with your schema.

Re: [PATCH v1 1/2] dt-bindings: input: Document Imagis ISA1200 haptic motor driver

[Svyatoslav Ryhel]

пт, 24 квіт. 2026 р. о 11:30 Rob Herring (Arm) <robh@kernel.org> пише:
>
>
> On Fri, 24 Apr 2026 10:13:04 +0300, Svyatoslav Ryhel wrote:
> > Document the Imagis ISA1200 haptic motor driver, used primarily in mobile
> > handheld devices and capable of supporting up to two motors.
> >
> > The exact datasheet for the ISA1200 is not available; all data was modeled
> > based on available downstream kernel sources for various devices and
> > fragments of information scattered across the internet.
> >
> > Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
> > ---
> >  .../bindings/input/imagis,isa1200.yaml        | 145 ++++++++++++++++++
> >  include/dt-bindings/input/isa1200.h           |  16 ++
> >  2 files changed, 161 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/input/imagis,isa1200.yaml
> >  create mode 100644 include/dt-bindings/input/isa1200.h
> >
>
> My bot found errors running 'make dt_binding_check' on your patch:
>
> yamllint warnings/errors:
>
> dtschema/dtc warnings/errors:
> /builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/input/imagis,isa1200.example.dtb: haptic-engine@49 (imagis,isa1200): enable-gpios: [[4294967295, 22, 0], [4294967295, 23, 0]] is too long
>         from schema $id: http://devicetree.org/schemas/gpio/gpio-consumer-common.yaml
>
> doc reference errors (make refcheckdocs):
>
> See https://patchwork.kernel.org/project/devicetree/patch/20260424071305.89503-2-clamor95@gmail.com
>
> The base for the series is generally the latest rc1. A different dependency
> should be noted in *this* patch.
>
> If you already ran 'make dt_binding_check' and didn't see the above
> error(s), then make sure 'yamllint' is installed and dt-schema is up to
> date:
>
> pip3 install dtschema --upgrade
>
> Please check and re-submit after running the above command yourself. Note
> that DT_SCHEMA_FILES can be set to your schema file to speed up checking
> your schema. However, it must be unset to test all examples with your schema.
>

I am not sure what is going on here. I have installed dtschema-2026.4
which seems to be the latest. Running the check with this schema gives
a clean result, no errors produced.

  SCHEMA  Documentation/devicetree/bindings/processed-schema.json
  CHKDT   ./Documentation/devicetree/bindings
  LINT    ./Documentation/devicetree/bindings
  DTEX    Documentation/devicetree/bindings/input/imagis,isa1200.example.dts
  DTC [C] Documentation/devicetree/bindings/input/imagis,isa1200.example.dtb

Re: [PATCH v1 1/2] dt-bindings: input: Document Imagis ISA1200 haptic motor driver

[Rob Herring]

On Fri, Apr 24, 2026 at 3:57 AM Svyatoslav Ryhel <clamor95@gmail.com> wrote:
>
> пт, 24 квіт. 2026 р. о 11:30 Rob Herring (Arm) <robh@kernel.org> пише:
> >
> >
> > On Fri, 24 Apr 2026 10:13:04 +0300, Svyatoslav Ryhel wrote:
> > > Document the Imagis ISA1200 haptic motor driver, used primarily in mobile
> > > handheld devices and capable of supporting up to two motors.
> > >
> > > The exact datasheet for the ISA1200 is not available; all data was modeled
> > > based on available downstream kernel sources for various devices and
> > > fragments of information scattered across the internet.
> > >
> > > Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
> > > ---
> > >  .../bindings/input/imagis,isa1200.yaml        | 145 ++++++++++++++++++
> > >  include/dt-bindings/input/isa1200.h           |  16 ++
> > >  2 files changed, 161 insertions(+)
> > >  create mode 100644 Documentation/devicetree/bindings/input/imagis,isa1200.yaml
> > >  create mode 100644 include/dt-bindings/input/isa1200.h
> > >
> >
> > My bot found errors running 'make dt_binding_check' on your patch:
> >
> > yamllint warnings/errors:
> >
> > dtschema/dtc warnings/errors:
> > /builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/input/imagis,isa1200.example.dtb: haptic-engine@49 (imagis,isa1200): enable-gpios: [[4294967295, 22, 0], [4294967295, 23, 0]] is too long
> >         from schema $id: http://devicetree.org/schemas/gpio/gpio-consumer-common.yaml
> >
> > doc reference errors (make refcheckdocs):
> >
> > See https://patchwork.kernel.org/project/devicetree/patch/20260424071305.89503-2-clamor95@gmail.com
> >
> > The base for the series is generally the latest rc1. A different dependency
> > should be noted in *this* patch.
> >
> > If you already ran 'make dt_binding_check' and didn't see the above
> > error(s), then make sure 'yamllint' is installed and dt-schema is up to
> > date:
> >
> > pip3 install dtschema --upgrade
> >
> > Please check and re-submit after running the above command yourself. Note
> > that DT_SCHEMA_FILES can be set to your schema file to speed up checking
> > your schema. However, it must be unset to test all examples with your schema.
> >
>
> I am not sure what is going on here. I have installed dtschema-2026.4
> which seems to be the latest. Running the check with this schema gives
> a clean result, no errors produced.
>
>   SCHEMA  Documentation/devicetree/bindings/processed-schema.json
>   CHKDT   ./Documentation/devicetree/bindings
>   LINT    ./Documentation/devicetree/bindings
>   DTEX    Documentation/devicetree/bindings/input/imagis,isa1200.example.dts
>   DTC [C] Documentation/devicetree/bindings/input/imagis,isa1200.example.dtb

Let me guess, you have DT_SCHEMA_FILES set? Then you are only
validating against the schemas that match and not all of them. There's
a single binding target now. See commit 400fbf4b5870 ("dt-bindings:
kbuild: Support single binding targets"). Of course, changes in this
schema could affect any other example, so you ultimately have to check
everything with just 'make dt_binding_check'.

The issue here is enable-gpios is defined as a standard property name
with 1 GPIO. I don't think we want to extend that because with more
than 1 you have to know what each signal is and the relationship
between them which will vary.

Rob

Re: [PATCH v1 1/2] dt-bindings: input: Document Imagis ISA1200 haptic motor driver

[Svyatoslav Ryhel]

пт, 24 квіт. 2026 р. о 14:55 Rob Herring <robh@kernel.org> пише:
>
> On Fri, Apr 24, 2026 at 3:57 AM Svyatoslav Ryhel <clamor95@gmail.com> wrote:
> >
> > пт, 24 квіт. 2026 р. о 11:30 Rob Herring (Arm) <robh@kernel.org> пише:
> > >
> > >
> > > On Fri, 24 Apr 2026 10:13:04 +0300, Svyatoslav Ryhel wrote:
> > > > Document the Imagis ISA1200 haptic motor driver, used primarily in mobile
> > > > handheld devices and capable of supporting up to two motors.
> > > >
> > > > The exact datasheet for the ISA1200 is not available; all data was modeled
> > > > based on available downstream kernel sources for various devices and
> > > > fragments of information scattered across the internet.
> > > >
> > > > Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
> > > > ---
> > > >  .../bindings/input/imagis,isa1200.yaml        | 145 ++++++++++++++++++
> > > >  include/dt-bindings/input/isa1200.h           |  16 ++
> > > >  2 files changed, 161 insertions(+)
> > > >  create mode 100644 Documentation/devicetree/bindings/input/imagis,isa1200.yaml
> > > >  create mode 100644 include/dt-bindings/input/isa1200.h
> > > >
> > >
> > > My bot found errors running 'make dt_binding_check' on your patch:
> > >
> > > yamllint warnings/errors:
> > >
> > > dtschema/dtc warnings/errors:
> > > /builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/input/imagis,isa1200.example.dtb: haptic-engine@49 (imagis,isa1200): enable-gpios: [[4294967295, 22, 0], [4294967295, 23, 0]] is too long
> > >         from schema $id: http://devicetree.org/schemas/gpio/gpio-consumer-common.yaml
> > >
> > > doc reference errors (make refcheckdocs):
> > >
> > > See https://patchwork.kernel.org/project/devicetree/patch/20260424071305.89503-2-clamor95@gmail.com
> > >
> > > The base for the series is generally the latest rc1. A different dependency
> > > should be noted in *this* patch.
> > >
> > > If you already ran 'make dt_binding_check' and didn't see the above
> > > error(s), then make sure 'yamllint' is installed and dt-schema is up to
> > > date:
> > >
> > > pip3 install dtschema --upgrade
> > >
> > > Please check and re-submit after running the above command yourself. Note
> > > that DT_SCHEMA_FILES can be set to your schema file to speed up checking
> > > your schema. However, it must be unset to test all examples with your schema.
> > >
> >
> > I am not sure what is going on here. I have installed dtschema-2026.4
> > which seems to be the latest. Running the check with this schema gives
> > a clean result, no errors produced.
> >
> >   SCHEMA  Documentation/devicetree/bindings/processed-schema.json
> >   CHKDT   ./Documentation/devicetree/bindings
> >   LINT    ./Documentation/devicetree/bindings
> >   DTEX    Documentation/devicetree/bindings/input/imagis,isa1200.example.dts
> >   DTC [C] Documentation/devicetree/bindings/input/imagis,isa1200.example.dtb
>
> Let me guess, you have DT_SCHEMA_FILES set? Then you are only
> validating against the schemas that match and not all of them. There's
> a single binding target now. See commit 400fbf4b5870 ("dt-bindings:
> kbuild: Support single binding targets"). Of course, changes in this
> schema could affect any other example, so you ultimately have to check
> everything with just 'make dt_binding_check'.
>

Thank you for explanation. That is unfortunate.

> The issue here is enable-gpios is defined as a standard property name
> with 1 GPIO. I don't think we want to extend that because with more
> than 1 you have to know what each signal is and the relationship
> between them which will vary.
>

Is it still possible to use enable-gpios for 2 gpios in local cases
(like this one) or I have to use some non-standard naming like
en-gpios or control-gpios etc.? This device has 2 pins called hen and
len, usually they are hooked to a single gpio, but that is not
universally true.

> Rob

Re: [PATCH v1 1/2] dt-bindings: input: Document Imagis ISA1200 haptic motor driver

[Rob Herring]

On Fri, Apr 24, 2026 at 7:58 AM Svyatoslav Ryhel <clamor95@gmail.com> wrote:
>
> пт, 24 квіт. 2026 р. о 14:55 Rob Herring <robh@kernel.org> пише:
> >
> > On Fri, Apr 24, 2026 at 3:57 AM Svyatoslav Ryhel <clamor95@gmail.com> wrote:
> > >
> > > пт, 24 квіт. 2026 р. о 11:30 Rob Herring (Arm) <robh@kernel.org> пише:
> > > >
> > > >
> > > > On Fri, 24 Apr 2026 10:13:04 +0300, Svyatoslav Ryhel wrote:
> > > > > Document the Imagis ISA1200 haptic motor driver, used primarily in mobile
> > > > > handheld devices and capable of supporting up to two motors.
> > > > >
> > > > > The exact datasheet for the ISA1200 is not available; all data was modeled
> > > > > based on available downstream kernel sources for various devices and
> > > > > fragments of information scattered across the internet.
> > > > >
> > > > > Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
> > > > > ---
> > > > >  .../bindings/input/imagis,isa1200.yaml        | 145 ++++++++++++++++++
> > > > >  include/dt-bindings/input/isa1200.h           |  16 ++
> > > > >  2 files changed, 161 insertions(+)
> > > > >  create mode 100644 Documentation/devicetree/bindings/input/imagis,isa1200.yaml
> > > > >  create mode 100644 include/dt-bindings/input/isa1200.h
> > > > >
> > > >
> > > > My bot found errors running 'make dt_binding_check' on your patch:
> > > >
> > > > yamllint warnings/errors:
> > > >
> > > > dtschema/dtc warnings/errors:
> > > > /builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/input/imagis,isa1200.example.dtb: haptic-engine@49 (imagis,isa1200): enable-gpios: [[4294967295, 22, 0], [4294967295, 23, 0]] is too long
> > > >         from schema $id: http://devicetree.org/schemas/gpio/gpio-consumer-common.yaml
> > > >
> > > > doc reference errors (make refcheckdocs):
> > > >
> > > > See https://patchwork.kernel.org/project/devicetree/patch/20260424071305.89503-2-clamor95@gmail.com
> > > >
> > > > The base for the series is generally the latest rc1. A different dependency
> > > > should be noted in *this* patch.
> > > >
> > > > If you already ran 'make dt_binding_check' and didn't see the above
> > > > error(s), then make sure 'yamllint' is installed and dt-schema is up to
> > > > date:
> > > >
> > > > pip3 install dtschema --upgrade
> > > >
> > > > Please check and re-submit after running the above command yourself. Note
> > > > that DT_SCHEMA_FILES can be set to your schema file to speed up checking
> > > > your schema. However, it must be unset to test all examples with your schema.
> > > >
> > >
> > > I am not sure what is going on here. I have installed dtschema-2026.4
> > > which seems to be the latest. Running the check with this schema gives
> > > a clean result, no errors produced.
> > >
> > >   SCHEMA  Documentation/devicetree/bindings/processed-schema.json
> > >   CHKDT   ./Documentation/devicetree/bindings
> > >   LINT    ./Documentation/devicetree/bindings
> > >   DTEX    Documentation/devicetree/bindings/input/imagis,isa1200.example.dts
> > >   DTC [C] Documentation/devicetree/bindings/input/imagis,isa1200.example.dtb
> >
> > Let me guess, you have DT_SCHEMA_FILES set? Then you are only
> > validating against the schemas that match and not all of them. There's
> > a single binding target now. See commit 400fbf4b5870 ("dt-bindings:
> > kbuild: Support single binding targets"). Of course, changes in this
> > schema could affect any other example, so you ultimately have to check
> > everything with just 'make dt_binding_check'.
> >
>
> Thank you for explanation. That is unfortunate.
>
> > The issue here is enable-gpios is defined as a standard property name
> > with 1 GPIO. I don't think we want to extend that because with more
> > than 1 you have to know what each signal is and the relationship
> > between them which will vary.
> >
>
> Is it still possible to use enable-gpios for 2 gpios in local cases
> (like this one) or I have to use some non-standard naming like
> en-gpios or control-gpios etc.? This device has 2 pins called hen and
> len, usually they are hooked to a single gpio, but that is not
> universally true.

Just do hen-gpios and len-gpios.

Rob

Re: [PATCH v1 1/2] dt-bindings: input: Document Imagis ISA1200 haptic motor driver

[Svyatoslav Ryhel]

пт, 24 квіт. 2026 р. о 17:58 Rob Herring <robh@kernel.org> пише:
>
> On Fri, Apr 24, 2026 at 7:58 AM Svyatoslav Ryhel <clamor95@gmail.com> wrote:
> >
> > пт, 24 квіт. 2026 р. о 14:55 Rob Herring <robh@kernel.org> пише:
> > >
> > > On Fri, Apr 24, 2026 at 3:57 AM Svyatoslav Ryhel <clamor95@gmail.com> wrote:
> > > >
> > > > пт, 24 квіт. 2026 р. о 11:30 Rob Herring (Arm) <robh@kernel.org> пише:
> > > > >
> > > > >
> > > > > On Fri, 24 Apr 2026 10:13:04 +0300, Svyatoslav Ryhel wrote:
> > > > > > Document the Imagis ISA1200 haptic motor driver, used primarily in mobile
> > > > > > handheld devices and capable of supporting up to two motors.
> > > > > >
> > > > > > The exact datasheet for the ISA1200 is not available; all data was modeled
> > > > > > based on available downstream kernel sources for various devices and
> > > > > > fragments of information scattered across the internet.
> > > > > >
> > > > > > Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
> > > > > > ---
> > > > > >  .../bindings/input/imagis,isa1200.yaml        | 145 ++++++++++++++++++
> > > > > >  include/dt-bindings/input/isa1200.h           |  16 ++
> > > > > >  2 files changed, 161 insertions(+)
> > > > > >  create mode 100644 Documentation/devicetree/bindings/input/imagis,isa1200.yaml
> > > > > >  create mode 100644 include/dt-bindings/input/isa1200.h
> > > > > >
> > > > >
> > > > > My bot found errors running 'make dt_binding_check' on your patch:
> > > > >
> > > > > yamllint warnings/errors:
> > > > >
> > > > > dtschema/dtc warnings/errors:
> > > > > /builds/robherring/dt-review-ci/linux/Documentation/devicetree/bindings/input/imagis,isa1200.example.dtb: haptic-engine@49 (imagis,isa1200): enable-gpios: [[4294967295, 22, 0], [4294967295, 23, 0]] is too long
> > > > >         from schema $id: http://devicetree.org/schemas/gpio/gpio-consumer-common.yaml
> > > > >
> > > > > doc reference errors (make refcheckdocs):
> > > > >
> > > > > See https://patchwork.kernel.org/project/devicetree/patch/20260424071305.89503-2-clamor95@gmail.com
> > > > >
> > > > > The base for the series is generally the latest rc1. A different dependency
> > > > > should be noted in *this* patch.
> > > > >
> > > > > If you already ran 'make dt_binding_check' and didn't see the above
> > > > > error(s), then make sure 'yamllint' is installed and dt-schema is up to
> > > > > date:
> > > > >
> > > > > pip3 install dtschema --upgrade
> > > > >
> > > > > Please check and re-submit after running the above command yourself. Note
> > > > > that DT_SCHEMA_FILES can be set to your schema file to speed up checking
> > > > > your schema. However, it must be unset to test all examples with your schema.
> > > > >
> > > >
> > > > I am not sure what is going on here. I have installed dtschema-2026.4
> > > > which seems to be the latest. Running the check with this schema gives
> > > > a clean result, no errors produced.
> > > >
> > > >   SCHEMA  Documentation/devicetree/bindings/processed-schema.json
> > > >   CHKDT   ./Documentation/devicetree/bindings
> > > >   LINT    ./Documentation/devicetree/bindings
> > > >   DTEX    Documentation/devicetree/bindings/input/imagis,isa1200.example.dts
> > > >   DTC [C] Documentation/devicetree/bindings/input/imagis,isa1200.example.dtb
> > >
> > > Let me guess, you have DT_SCHEMA_FILES set? Then you are only
> > > validating against the schemas that match and not all of them. There's
> > > a single binding target now. See commit 400fbf4b5870 ("dt-bindings:
> > > kbuild: Support single binding targets"). Of course, changes in this
> > > schema could affect any other example, so you ultimately have to check
> > > everything with just 'make dt_binding_check'.
> > >
> >
> > Thank you for explanation. That is unfortunate.
> >
> > > The issue here is enable-gpios is defined as a standard property name
> > > with 1 GPIO. I don't think we want to extend that because with more
> > > than 1 you have to know what each signal is and the relationship
> > > between them which will vary.
> > >
> >
> > Is it still possible to use enable-gpios for 2 gpios in local cases
> > (like this one) or I have to use some non-standard naming like
> > en-gpios or control-gpios etc.? This device has 2 pins called hen and
> > len, usually they are hooked to a single gpio, but that is not
> > universally true.
>
> Just do hen-gpios and len-gpios.
>

That would require reworking all gpio handling. Would you mind if I
use control-gpios? It is not standard and does not cause that
complain.

Additionally, is it acceptable to use header defines in imagis,clk-div
or should it use direct values instead. Thank you.

> Rob

[PATCH v1 2/2] Input: isa1200 - new driver for Imagis ISA1200

[Svyatoslav Ryhel]

From: Linus Walleij <linusw@kernel.org>

The ISA1200 is a haptic feedback unit from Imagis Technology using two
motors for haptic feedback in mobile phones. Used in many mobile devices
c. 2012 including Samsung Galxy S Advance GT-I9070 (Janice), Samsung Beam
GT-I8350 (Gavini), LG Optimus 4X P880 and LG Optimus Vu P895.

The exact datasheet for the ISA1200 is not available; all data was modeled
based on available downstream kernel sources for various devices and
fragments of information scattered across the internet.

Signed-off-by: Linus Walleij <linusw@kernel.org>
Co-developed-by: Svyatoslav Ryhel <clamor95@gmail.com>
Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
---
 drivers/input/misc/Kconfig   |  11 +
 drivers/input/misc/Makefile  |   1 +
 drivers/input/misc/isa1200.c | 459 +++++++++++++++++++++++++++++++++++
 3 files changed, 471 insertions(+)
 create mode 100644 drivers/input/misc/isa1200.c

diff --git a/drivers/input/misc/Kconfig b/drivers/input/misc/Kconfig
index 94a753fcb64f..5e5d46f44b91 100644
--- a/drivers/input/misc/Kconfig
+++ b/drivers/input/misc/Kconfig
@@ -852,6 +852,17 @@ config INPUT_IQS7222
 	  To compile this driver as a module, choose M here: the
 	  module will be called iqs7222.
 
+config INPUT_ISA1200_HAPTIC
+	tristate "Imagis ISA1200 haptic feedback unit"
+	depends on I2C
+	select REGMAP_I2C
+	help
+	  Say Y to enable support for the Imagis ISA1200 haptic
+	  feedback unit.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called isa1200.
+
 config INPUT_CMA3000
 	tristate "VTI CMA3000 Tri-axis accelerometer"
 	help
diff --git a/drivers/input/misc/Makefile b/drivers/input/misc/Makefile
index 415fc4e2918b..d62bf2e9d85f 100644
--- a/drivers/input/misc/Makefile
+++ b/drivers/input/misc/Makefile
@@ -49,6 +49,7 @@ obj-$(CONFIG_INPUT_IMS_PCU)		+= ims-pcu.o
 obj-$(CONFIG_INPUT_IQS269A)		+= iqs269a.o
 obj-$(CONFIG_INPUT_IQS626A)		+= iqs626a.o
 obj-$(CONFIG_INPUT_IQS7222)		+= iqs7222.o
+obj-$(CONFIG_INPUT_ISA1200_HAPTIC)	+= isa1200.o
 obj-$(CONFIG_INPUT_KEYSPAN_REMOTE)	+= keyspan_remote.o
 obj-$(CONFIG_INPUT_KXTJ9)		+= kxtj9.o
 obj-$(CONFIG_INPUT_M68K_BEEP)		+= m68kspkr.o
diff --git a/drivers/input/misc/isa1200.c b/drivers/input/misc/isa1200.c
new file mode 100644
index 000000000000..965883e29c37
--- /dev/null
+++ b/drivers/input/misc/isa1200.c
@@ -0,0 +1,459 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#include <linux/bitmap.h>
+#include <linux/bits.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/err.h>
+#include <linux/gpio/consumer.h>
+#include <linux/i2c.h>
+#include <linux/input.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/property.h>
+#include <linux/pwm.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+#include <linux/units.h>
+
+#include <dt-bindings/input/isa1200.h>
+
+/*
+ * System control (LDO regulator)
+ *
+ * LDO voltage to register mapping is linear, but it is split in two parts:
+ * 2.3V - 3.0V map to 0x08 - 0x0f; 3.1V - 3.8V map to 0x00 - 0x7
+ */
+
+#define ISA1200_SCTRL			0x00
+#define ISA1200_LDO_VOLTAGE_BASE	0x08
+#define ISA1200_LDO_VOLTAGE_STEP	100000
+#define ISA1200_LDO_VOLTAGE_2V3		23
+#define ISA1200_LDO_VOLTAGE_3V1		31
+
+/*
+ * The output frequency is calculated with this formula:
+ *
+ *                 base clock frequency
+ * fout = -----------------------------------------
+ *        (128 - PWM_FREQ) * 2 * PLLDIV * PWM_PERIOD
+ *
+ * The base clock frequency is the clock frequency provided on the
+ * clock input to the chip, divided by the value in HCTRL0
+ *
+ * PWM_FREQ is configured in register HCTRL4, it is common to set this
+ * to 0 to get only two variables to calculate.
+ *
+ * PLLDIV is configured in register HCTRL3 (bits 7..4, so 0..15)
+ * PWM_PERIOD is configured in register HCTRL6
+ * Further the duty cycle can be configured in HCTRL5
+ */
+
+/*
+ * HCTRL0 configures clock or PWM input and selects the divider for
+ * the clock input.
+ */
+#define ISA1200_HCTRL0			0x30
+#define ISA1200_HCTRL0_HAP_ENABLE	BIT(7)
+#define ISA1200_HCTRL0_PWM_GEN_MODE	BIT(4)
+#define ISA1200_HCTRL0_PWM_INPUT_MODE	BIT(3)
+#define ISA1200_HCTRL0_TO_CLKDIV(n)	(128 << (n))
+
+/*
+ * HCTRL1 configures the motor type and clock sourse
+ */
+#define ISA1200_HCTRL1			0x31
+#define ISA1200_HCTRL1_EXT_CLOCK	BIT(7)
+#define ISA1200_HCTRL1_DAC_INVERT	BIT(6)
+#define ISA1200_HCTRL1_MODE(n)		((n) << 5)
+
+/* HCTRL2 controls software reset of the chip */
+#define ISA1200_HCTRL2			0x32
+#define ISA1200_HCTRL2_SW_RESET		BIT(0)
+
+/*
+ * HCTRL3 controls the PLL divisor
+ *
+ * Bits [0,1] are always set to 1 (we don't know what they are
+ * used for) and bit 4 and upward control the PLL divisor.
+ */
+#define ISA1200_HCTRL3			0x33
+#define ISA1200_HCTRL3_DEFAULT		0x03
+#define ISA1200_HCTRL3_PLLDIV(n)	(((n) & 0xf) << 4)
+
+/* HCTRL4 controls the PWM frequency of external channel */
+#define ISA1200_HCTRL4			0x34
+
+/* HCTRL5 controls the PWM high duty cycle of internal channel */
+#define ISA1200_HCTRL5			0x35
+
+/* HCTRL6 controls the PWM period of internal channel */
+#define ISA1200_HCTRL6			0x36
+
+#define ISA1200_EN_PINS_MAX		2
+
+struct isa1200_config {
+	u32 ldo_voltage;
+	u32 mode;
+	u32 clkdiv;
+	u32 plldiv;
+	u32 freq;
+	u32 period;
+	u32 duty;
+};
+
+struct isa1200 {
+	struct input_dev *input;
+	struct regmap *map;
+
+	struct clk *clk;
+	struct pwm_device *pwm;
+	struct gpio_descs *enable_gpios;
+
+	struct work_struct play_work;
+	struct isa1200_config config;
+
+	int level;
+};
+
+static const struct regmap_config isa1200_regmap_config = {
+	.reg_bits = 8,
+	.val_bits = 8,
+	.max_register = 0x3d,
+};
+
+static void isa1200_start(struct isa1200 *isa)
+{
+	struct isa1200_config *config = &isa->config;
+	struct pwm_state state;
+	u8 hctrl0, hctrl1;
+	DECLARE_BITMAP(values, ISA1200_EN_PINS_MAX);
+
+	clk_prepare_enable(isa->clk);
+
+	bitmap_fill(values, ISA1200_EN_PINS_MAX);
+	gpiod_multi_set_value_cansleep(isa->enable_gpios, values);
+
+	usleep_range(200, 300);
+
+	regmap_write(isa->map, ISA1200_SCTRL, config->ldo_voltage);
+
+	if (isa->clk) {
+		hctrl0 = ISA1200_HCTRL0_PWM_GEN_MODE;
+		hctrl1 = ISA1200_HCTRL1_EXT_CLOCK;
+	}
+
+	if (isa->pwm) {
+		hctrl0 = ISA1200_HCTRL0_PWM_INPUT_MODE;
+		hctrl1 = 0;
+	}
+
+	hctrl0 |= config->clkdiv;
+	hctrl1 |= ISA1200_HCTRL1_DAC_INVERT;
+	hctrl1 |= ISA1200_HCTRL1_MODE(config->mode);
+
+	regmap_write(isa->map, ISA1200_HCTRL0, hctrl0);
+	regmap_write(isa->map, ISA1200_HCTRL1, hctrl1);
+
+	/* Make sure to de-assert software reset */
+	regmap_write(isa->map, ISA1200_HCTRL2, 0x00);
+
+	/* PLL divisor */
+	regmap_write(isa->map, ISA1200_HCTRL3,
+		     ISA1200_HCTRL3_PLLDIV(config->plldiv) |
+		     ISA1200_HCTRL3_DEFAULT);
+
+	/* Frequency */
+	regmap_write(isa->map, ISA1200_HCTRL4, config->freq);
+	/* Duty cycle */
+	regmap_write(isa->map, ISA1200_HCTRL5, config->period >> 1);
+	/* Period */
+	regmap_write(isa->map, ISA1200_HCTRL6, config->period);
+
+	hctrl0 |= ISA1200_HCTRL0_HAP_ENABLE;
+	regmap_write(isa->map, ISA1200_HCTRL0, hctrl0);
+
+	if (isa->clk)
+		regmap_write(isa->map, ISA1200_HCTRL5, config->duty);
+
+	if (isa->pwm) {
+		pwm_get_state(isa->pwm, &state);
+		state.duty_cycle = config->duty;
+		state.enabled = true;
+		pwm_apply_might_sleep(isa->pwm, &state);
+	}
+}
+
+static void isa1200_stop(struct isa1200 *isa)
+{
+	struct pwm_state state;
+	DECLARE_BITMAP(values, ISA1200_EN_PINS_MAX);
+
+	if (isa->pwm) {
+		pwm_get_state(isa->pwm, &state);
+		state.duty_cycle = 0;
+		state.enabled = false;
+		pwm_apply_might_sleep(isa->pwm, &state);
+	}
+
+	regmap_write(isa->map, ISA1200_HCTRL0, 0x00);
+
+	bitmap_zero(values, ISA1200_EN_PINS_MAX);
+	gpiod_multi_set_value_cansleep(isa->enable_gpios, values);
+
+	clk_disable_unprepare(isa->clk);
+}
+
+static void isa1200_play_work(struct work_struct *work)
+{
+	struct isa1200 *isa =
+		container_of(work, struct isa1200, play_work);
+
+	if (isa->level)
+		isa1200_start(isa);
+	else
+		isa1200_stop(isa);
+}
+
+static int isa1200_vibrator_play_effect(struct input_dev *input, void *data,
+					struct ff_effect *effect)
+{
+	struct isa1200 *isa = input_get_drvdata(input);
+	int level;
+
+	/*
+	 * TODO: we currently only support rumble.
+	 * The ISA1200 can control two motors and some devices
+	 * also have two motors mounted.
+	 */
+	level = effect->u.rumble.strong_magnitude;
+	if (!level)
+		level = effect->u.rumble.weak_magnitude;
+
+	dev_dbg(&input->dev, "FF effect type %d level %d\n",
+		effect->type, level);
+
+	if (isa->level != level) {
+		isa->level = level;
+		schedule_work(&isa->play_work);
+	}
+
+	return 0;
+}
+
+static void isa1200_vibrator_close(struct input_dev *input)
+{
+	struct isa1200 *isa = input_get_drvdata(input);
+
+	cancel_work_sync(&isa->play_work);
+
+	if (isa->level)
+		isa1200_stop(isa);
+
+	isa->level = 0;
+}
+
+static int isa1200_of_probe(struct i2c_client *client)
+{
+	static const char * const isa1200_supplies[] = { "vdd", "vddp" };
+	struct isa1200 *isa = i2c_get_clientdata(client);
+	struct isa1200_config *config = &isa->config;
+	struct device *dev = &client->dev;
+	struct fwnode_handle *ldo_node;
+	int ret;
+
+	isa->clk = devm_clk_get_optional(dev, NULL);
+	if (IS_ERR(isa->clk))
+		return dev_err_probe(dev, PTR_ERR(isa->clk),
+				     "failed to get clock\n");
+
+	isa->pwm = devm_pwm_get(dev, NULL);
+	if (IS_ERR(isa->pwm))
+		isa->pwm = NULL;
+
+	ret = devm_regulator_bulk_get_enable(dev, ARRAY_SIZE(isa1200_supplies),
+					     isa1200_supplies);
+	if (ret)
+		return dev_err_probe(dev, ret, "failed to set up supplies\n");
+
+	isa->enable_gpios = devm_gpiod_get_array_optional(dev, "enable",
+							  GPIOD_OUT_LOW);
+	if (IS_ERR(isa->enable_gpios))
+		return dev_err_probe(dev, PTR_ERR(isa->enable_gpios),
+				     "failed to get enable gpios\n");
+
+	ldo_node = device_get_named_child_node(dev, "ldo");
+	if (!ldo_node)
+		return dev_err_probe(dev, -ENODEV,
+				     "failed to get embedded LDO node\n");
+
+	config->ldo_voltage = 2300000;
+	ret = fwnode_property_read_u32(ldo_node, "regulator-min-microvolt",
+				       &config->ldo_voltage);
+	fwnode_handle_put(ldo_node);
+	if (ret)
+		return dev_err_probe(dev, ret,
+				     "failed to get ldo voltage\n");
+
+	/* Device supports only 2.3V - 3.8V range */
+	if (config->ldo_voltage < 2300000 || config->ldo_voltage > 38000000)
+		return dev_err_probe(dev, -EINVAL,
+				     "voltage is out of 2.3V - 3.8V range\n");
+
+	config->ldo_voltage /= ISA1200_LDO_VOLTAGE_STEP;
+	if (config->ldo_voltage < ISA1200_LDO_VOLTAGE_3V1)
+		config->ldo_voltage = config->ldo_voltage -
+				      ISA1200_LDO_VOLTAGE_2V3 +
+				      ISA1200_LDO_VOLTAGE_BASE;
+	else
+		config->ldo_voltage -= ISA1200_LDO_VOLTAGE_3V1;
+
+	config->mode = ISA1200_LRA_MODE;
+	device_property_read_u32(dev, "imagis,mode", &config->mode);
+
+	config->clkdiv = ISA1200_CKLDIV_128;
+	device_property_read_u32(dev, "imagis,clk-div", &config->clkdiv);
+
+	config->plldiv = 1;
+	device_property_read_u32(dev, "imagis,pll-div", &config->plldiv);
+
+	config->period = 0;
+	config->freq = 0;
+	config->duty = 0;
+
+	if (isa->clk) {
+		ret = device_property_read_u32(dev, "imagis,period-ns",
+					       &config->period);
+		if (ret)
+			return dev_err_probe(dev, ret,
+					     "failed to get period\n");
+
+		config->duty = config->period >> 1;
+	}
+
+	if (isa->pwm) {
+		struct pwm_state state;
+
+		pwm_init_state(isa->pwm, &state);
+
+		config->freq = div64_u64(NANO, state.period *
+					 ISA1200_HCTRL0_TO_CLKDIV(config->clkdiv));
+		config->duty = state.period >> 1;
+
+		ret = pwm_apply_might_sleep(isa->pwm, &state);
+		if (ret)
+			return dev_err_probe(dev, ret,
+					     "failed to apply initial PWM state\n");
+	}
+
+	device_property_read_u32(dev, "imagis,duty-cycle-ns", &config->duty);
+
+	return 0;
+}
+
+static int isa1200_probe(struct i2c_client *client)
+{
+	struct isa1200 *isa;
+	struct device *dev = &client->dev;
+	DECLARE_BITMAP(values, ISA1200_EN_PINS_MAX);
+	u32 val;
+	int ret;
+
+	isa = devm_kzalloc(dev, sizeof(*isa), GFP_KERNEL);
+	if (!isa)
+		return -ENOMEM;
+
+	isa->input = devm_input_allocate_device(dev);
+	if (!isa->input)
+		return -ENOMEM;
+
+	i2c_set_clientdata(client, isa);
+
+	ret = isa1200_of_probe(client);
+	if (ret)
+		return ret;
+
+	isa->map = devm_regmap_init_i2c(client, &isa1200_regmap_config);
+	if (IS_ERR(isa->map))
+		return dev_err_probe(dev, PTR_ERR(isa->map),
+				     "failed to initialize register map\n");
+
+	clk_prepare_enable(isa->clk);
+
+	bitmap_fill(values, ISA1200_EN_PINS_MAX);
+	gpiod_multi_set_value_cansleep(isa->enable_gpios, values);
+
+	usleep_range(200, 300);
+
+	/* Read a register so we know that regmap and I2C transport works */
+	ret = regmap_read(isa->map, ISA1200_SCTRL, &val);
+	if (ret)
+		return dev_err_probe(dev, ret, "failed to read SCTRL\n");
+
+	INIT_WORK(&isa->play_work, isa1200_play_work);
+
+	isa->input->name = "isa1200-haptic";
+	isa->input->id.bustype = BUS_HOST;
+	isa->input->dev.parent = dev;
+	isa->input->close = isa1200_vibrator_close;
+
+	input_set_drvdata(isa->input, isa);
+
+	/* TODO: this hardware can likely support more than rumble */
+	input_set_capability(isa->input, EV_FF, FF_RUMBLE);
+
+	ret = input_ff_create_memless(isa->input, NULL,
+				      isa1200_vibrator_play_effect);
+	if (ret)
+		return dev_err_probe(dev, ret, "couldn't create FF dev\n");
+
+	ret = input_register_device(isa->input);
+	if (ret)
+		return dev_err_probe(dev, ret, "couldn't register input dev\n");
+
+	return ret;
+}
+
+static int isa1200_suspend(struct device *dev)
+{
+	struct isa1200 *isa = dev_get_drvdata(dev);
+
+	if (isa->level)
+		isa1200_stop(isa);
+
+	return 0;
+}
+
+static int isa1200_resume(struct device *dev)
+{
+	struct isa1200 *isa = dev_get_drvdata(dev);
+
+	if (isa->level)
+		isa1200_start(isa);
+
+	return 0;
+}
+
+static DEFINE_SIMPLE_DEV_PM_OPS(isa1200_pm_ops, isa1200_suspend, isa1200_resume);
+
+static const struct of_device_id isa1200_of_match[] = {
+	{ .compatible = "imagis,isa1200" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, isa1200_of_match);
+
+static struct i2c_driver isa1200_i2c_driver = {
+	.driver = {
+		.name = "isa1200",
+		.of_match_table = isa1200_of_match,
+		.pm = pm_sleep_ptr(&isa1200_pm_ops),
+	},
+	.probe = isa1200_probe,
+};
+module_i2c_driver(isa1200_i2c_driver);
+
+MODULE_AUTHOR("Linus Walleij <linusw@kernel.org>");
+MODULE_AUTHOR("Svyatoslav Ryhel <clamor95@gmail.com>");
+MODULE_DESCRIPTION("Imagis ISA1200 haptic feedback unit");
+MODULE_LICENSE("GPL");
-- 
2.51.0

Re: [PATCH v1 2/2] Input: isa1200 - new driver for Imagis ISA1200

[Dmitry Torokhov]

On Fri, Apr 24, 2026 at 10:13:05AM +0300, Svyatoslav Ryhel wrote:
> From: Linus Walleij <linusw@kernel.org>
> 
> The ISA1200 is a haptic feedback unit from Imagis Technology using two
> motors for haptic feedback in mobile phones. Used in many mobile devices
> c. 2012 including Samsung Galxy S Advance GT-I9070 (Janice), Samsung Beam
> GT-I8350 (Gavini), LG Optimus 4X P880 and LG Optimus Vu P895.
> 
> The exact datasheet for the ISA1200 is not available; all data was modeled
> based on available downstream kernel sources for various devices and
> fragments of information scattered across the internet.
> 
> Signed-off-by: Linus Walleij <linusw@kernel.org>
> Co-developed-by: Svyatoslav Ryhel <clamor95@gmail.com>
> Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>

There are a bunch of valid sashiko comments, please address them:

https://sashiko.dev/#/patchset/20260424071305.89503-1-clamor95%40gmail.com

Thanks.

-- 
Dmitry

Re: [PATCH v1 2/2] Input: isa1200 - new driver for Imagis ISA1200

[Svyatoslav Ryhel]

пт, 24 квіт. 2026 р. о 18:31 Dmitry Torokhov <dmitry.torokhov@gmail.com> пише:
>
> On Fri, Apr 24, 2026 at 10:13:05AM +0300, Svyatoslav Ryhel wrote:
> > From: Linus Walleij <linusw@kernel.org>
> >
> > The ISA1200 is a haptic feedback unit from Imagis Technology using two
> > motors for haptic feedback in mobile phones. Used in many mobile devices
> > c. 2012 including Samsung Galxy S Advance GT-I9070 (Janice), Samsung Beam
> > GT-I8350 (Gavini), LG Optimus 4X P880 and LG Optimus Vu P895.
> >
> > The exact datasheet for the ISA1200 is not available; all data was modeled
> > based on available downstream kernel sources for various devices and
> > fragments of information scattered across the internet.
> >
> > Signed-off-by: Linus Walleij <linusw@kernel.org>
> > Co-developed-by: Svyatoslav Ryhel <clamor95@gmail.com>
> > Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
>
> There are a bunch of valid sashiko comments, please address them:
>
> https://sashiko.dev/#/patchset/20260424071305.89503-1-clamor95%40gmail.com
>
> Thanks.
>

Acknowledged, thank you.

> --
> Dmitry

Re: [PATCH v1 2/2] Input: isa1200 - new driver for Imagis ISA1200

[Svyatoslav Ryhel]

пт, 24 квіт. 2026 р. о 19:01 Svyatoslav Ryhel <clamor95@gmail.com> пише:
>
> пт, 24 квіт. 2026 р. о 18:31 Dmitry Torokhov <dmitry.torokhov@gmail.com> пише:
> >
> > On Fri, Apr 24, 2026 at 10:13:05AM +0300, Svyatoslav Ryhel wrote:
> > > From: Linus Walleij <linusw@kernel.org>
> > >
> > > The ISA1200 is a haptic feedback unit from Imagis Technology using two
> > > motors for haptic feedback in mobile phones. Used in many mobile devices
> > > c. 2012 including Samsung Galxy S Advance GT-I9070 (Janice), Samsung Beam
> > > GT-I8350 (Gavini), LG Optimus 4X P880 and LG Optimus Vu P895.
> > >
> > > The exact datasheet for the ISA1200 is not available; all data was modeled
> > > based on available downstream kernel sources for various devices and
> > > fragments of information scattered across the internet.
> > >
> > > Signed-off-by: Linus Walleij <linusw@kernel.org>
> > > Co-developed-by: Svyatoslav Ryhel <clamor95@gmail.com>
> > > Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
> >
> > There are a bunch of valid sashiko comments, please address them:
> >
> > https://sashiko.dev/#/patchset/20260424071305.89503-1-clamor95%40gmail.com
> >
> > Thanks.
> >
>
> Acknowledged, thank you.
>

Hello Dmitry!

I have a question regarding this sashiko comment

> +static void isa1200_play_work(struct work_struct *work)
> +{
> + struct isa1200 *isa =
> + container_of(work, struct isa1200, play_work);
> +
> + if (isa->level)
> + isa1200_start(isa);
> + else
> + isa1200_stop(isa);
> +}
Because the driver tracks isa->level locklessly, if an effect starts
and quickly stops, the workqueue might only execute once. When it
executes, it sees isa->level == 0 and calls isa1200_stop(). Since
isa1200_start() was never called for this effect,
clk_disable_unprepare(isa->clk) will be invoked on an un-enabled
clock. Does this unbalance the clock reference count?

This is a valid comment, but I cannot find how this should be handled
among all available haptic drivers. Maybe you can point me in the
right direction?

> > --
> > Dmitry

Re: [PATCH v1 2/2] Input: isa1200 - new driver for Imagis ISA1200

[Dmitry Torokhov]

Hi Svyatoslav,

On Sat, Apr 25, 2026 at 08:26:00PM +0300, Svyatoslav Ryhel wrote:
> Hello Dmitry!
> 
> I have a question regarding this sashiko comment
> 
> > +static void isa1200_play_work(struct work_struct *work)
> > +{
> > + struct isa1200 *isa =
> > + container_of(work, struct isa1200, play_work);
> > +
> > + if (isa->level)
> > + isa1200_start(isa);
> > + else
> > + isa1200_stop(isa);
> > +}
> Because the driver tracks isa->level locklessly, if an effect starts
> and quickly stops, the workqueue might only execute once. When it
> executes, it sees isa->level == 0 and calls isa1200_stop(). Since
> isa1200_start() was never called for this effect,
> clk_disable_unprepare(isa->clk) will be invoked on an un-enabled
> clock. Does this unbalance the clock reference count?
> 
> This is a valid comment, but I cannot find how this should be handled
> among all available haptic drivers. Maybe you can point me in the
> right direction?

Maybe have a flag reflecting the true (committed) state of the
controller that is both checked and updated in the work entity?

Thanks.

-- 
Dmitry