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* [PATCH 1/5] IIO: Ingenic JZ47xx: Add xlate cb to retrieve correct channel idx
@ 2020-01-05  0:16 Artur Rojek
  2020-01-05  0:16 ` [PATCH 2/5] dt-bindings: iio/adc: Add touchscreen idx for JZ47xx SoC ADC Artur Rojek
                   ` (3 more replies)
  0 siblings, 4 replies; 13+ messages in thread
From: Artur Rojek @ 2020-01-05  0:16 UTC (permalink / raw)
  To: Dmitry Torokhov, Rob Herring, Mark Rutland, Jonathan Cameron,
	Paul Cercueil
  Cc: linux-input, devicetree, linux-iio, linux-kernel, Artur Rojek

Provide an of_xlate callback in order to retrieve the correct channel
specifier index from the IIO channels array.

Signed-off-by: Artur Rojek <contact@artur-rojek.eu>
Tested-by: Paul Cercueil <paul@crapouillou.net>
---
 drivers/iio/adc/ingenic-adc.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/iio/adc/ingenic-adc.c b/drivers/iio/adc/ingenic-adc.c
index 39c0a609fc94..7a24bc1dabe1 100644
--- a/drivers/iio/adc/ingenic-adc.c
+++ b/drivers/iio/adc/ingenic-adc.c
@@ -383,6 +383,21 @@ static int ingenic_adc_read_raw(struct iio_dev *iio_dev,
 	}
 }
 
+static int ingenic_adc_of_xlate(struct iio_dev *iio_dev,
+				const struct of_phandle_args *iiospec)
+{
+	int i;
+
+	if (!iiospec->args_count)
+		return -EINVAL;
+
+	for (i = 0; i < iio_dev->num_channels; ++i)
+		if (iio_dev->channels[i].channel == iiospec->args[0])
+			return i;
+
+	return -EINVAL;
+}
+
 static void ingenic_adc_clk_cleanup(void *data)
 {
 	clk_unprepare(data);
@@ -392,6 +407,7 @@ static const struct iio_info ingenic_adc_info = {
 	.write_raw = ingenic_adc_write_raw,
 	.read_raw = ingenic_adc_read_raw,
 	.read_avail = ingenic_adc_read_avail,
+	.of_xlate = ingenic_adc_of_xlate,
 };
 
 static const struct iio_chan_spec ingenic_channels[] = {
-- 
2.24.1


^ permalink raw reply	[flat|nested] 13+ messages in thread

* [PATCH 2/5] dt-bindings: iio/adc: Add touchscreen idx for JZ47xx SoC ADC
  2020-01-05  0:16 [PATCH 1/5] IIO: Ingenic JZ47xx: Add xlate cb to retrieve correct channel idx Artur Rojek
@ 2020-01-05  0:16 ` Artur Rojek
  2020-01-08 16:59   ` Rob Herring
  2020-01-05  0:16 ` [PATCH 3/5] IIO: Ingenic JZ47xx: Add touchscreen mode Artur Rojek
                   ` (2 subsequent siblings)
  3 siblings, 1 reply; 13+ messages in thread
From: Artur Rojek @ 2020-01-05  0:16 UTC (permalink / raw)
  To: Dmitry Torokhov, Rob Herring, Mark Rutland, Jonathan Cameron,
	Paul Cercueil
  Cc: linux-input, devicetree, linux-iio, linux-kernel, Artur Rojek

Introduce support for touchscreen channels found in JZ47xx SoCs.

Signed-off-by: Artur Rojek <contact@artur-rojek.eu>
Tested-by: Paul Cercueil <paul@crapouillou.net>
---
 include/dt-bindings/iio/adc/ingenic,adc.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/dt-bindings/iio/adc/ingenic,adc.h b/include/dt-bindings/iio/adc/ingenic,adc.h
index 42f871ab3272..95e20a8d6dc8 100644
--- a/include/dt-bindings/iio/adc/ingenic,adc.h
+++ b/include/dt-bindings/iio/adc/ingenic,adc.h
@@ -7,5 +7,7 @@
 #define INGENIC_ADC_AUX		0
 #define INGENIC_ADC_BATTERY	1
 #define INGENIC_ADC_AUX2	2
+#define INGENIC_ADC_TOUCH_XP	3
+#define INGENIC_ADC_TOUCH_YP	4
 
 #endif
-- 
2.24.1


^ permalink raw reply	[flat|nested] 13+ messages in thread

* [PATCH 3/5] IIO: Ingenic JZ47xx: Add touchscreen mode.
  2020-01-05  0:16 [PATCH 1/5] IIO: Ingenic JZ47xx: Add xlate cb to retrieve correct channel idx Artur Rojek
  2020-01-05  0:16 ` [PATCH 2/5] dt-bindings: iio/adc: Add touchscreen idx for JZ47xx SoC ADC Artur Rojek
@ 2020-01-05  0:16 ` Artur Rojek
  2020-01-11 11:46   ` Jonathan Cameron
  2020-01-05  0:16 ` [PATCH 4/5] dt-bindings: input: Add docs for ADC driven joystick Artur Rojek
  2020-01-05  0:16 ` [PATCH 5/5] input: joystick: Add ADC attached joystick driver Artur Rojek
  3 siblings, 1 reply; 13+ messages in thread
From: Artur Rojek @ 2020-01-05  0:16 UTC (permalink / raw)
  To: Dmitry Torokhov, Rob Herring, Mark Rutland, Jonathan Cameron,
	Paul Cercueil
  Cc: linux-input, devicetree, linux-iio, linux-kernel, Artur Rojek

Implement support for the touchscreen mode found in JZ47xx SoCs ADC.

Signed-off-by: Artur Rojek <contact@artur-rojek.eu>
Tested-by: Paul Cercueil <paul@crapouillou.net>
---
 drivers/iio/adc/Kconfig       |   3 +
 drivers/iio/adc/ingenic-adc.c | 120 +++++++++++++++++++++++++++++++++-
 2 files changed, 121 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index 5d8540b7b427..dabbf15032af 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -446,6 +446,9 @@ config INA2XX_ADC
 config INGENIC_ADC
 	tristate "Ingenic JZ47xx SoCs ADC driver"
 	depends on MIPS || COMPILE_TEST
+	select IIO_BUFFER
+	select IIO_BUFFER_CB
+	select IIO_KFIFO_BUF
 	help
 	  Say yes here to build support for the Ingenic JZ47xx SoCs ADC unit.
 
diff --git a/drivers/iio/adc/ingenic-adc.c b/drivers/iio/adc/ingenic-adc.c
index 7a24bc1dabe1..4dbf15fdd95d 100644
--- a/drivers/iio/adc/ingenic-adc.c
+++ b/drivers/iio/adc/ingenic-adc.c
@@ -8,7 +8,10 @@
 
 #include <dt-bindings/iio/adc/ingenic,adc.h>
 #include <linux/clk.h>
+#include <linux/iio/buffer.h>
 #include <linux/iio/iio.h>
+#include <linux/iio/kfifo_buf.h>
+#include <linux/interrupt.h>
 #include <linux/io.h>
 #include <linux/iopoll.h>
 #include <linux/kernel.h>
@@ -20,6 +23,8 @@
 #define JZ_ADC_REG_CFG			0x04
 #define JZ_ADC_REG_CTRL			0x08
 #define JZ_ADC_REG_STATUS		0x0c
+#define JZ_ADC_REG_ADSAME		0x10
+#define JZ_ADC_REG_ADWAIT		0x14
 #define JZ_ADC_REG_ADTCH		0x18
 #define JZ_ADC_REG_ADBDAT		0x1c
 #define JZ_ADC_REG_ADSDAT		0x20
@@ -28,6 +33,9 @@
 #define JZ_ADC_REG_ENABLE_PD		BIT(7)
 #define JZ_ADC_REG_CFG_AUX_MD		(BIT(0) | BIT(1))
 #define JZ_ADC_REG_CFG_BAT_MD		BIT(4)
+#define JZ_ADC_REG_CFG_PULL_UP(n)	((n) << 16)
+#define JZ_ADC_REG_CFG_SAMPLE_NUM(n)	((n) << 10)
+#define JZ_ADC_REG_CFG_TOUCH_OPS_MASK	(BIT(31) | GENMASK(23, 10))
 #define JZ_ADC_REG_ADCLK_CLKDIV_LSB	0
 #define JZ4725B_ADC_REG_ADCLK_CLKDIV10US_LSB	16
 #define JZ4770_ADC_REG_ADCLK_CLKDIV10US_LSB	8
@@ -44,6 +52,14 @@
 #define JZ4770_ADC_BATTERY_VREF			6600
 #define JZ4770_ADC_BATTERY_VREF_BITS		12
 
+#define JZ_ADC_IRQ_AUX			BIT(0)
+#define JZ_ADC_IRQ_BATTERY		BIT(1)
+#define JZ_ADC_IRQ_TOUCH		BIT(2)
+#define JZ_ADC_IRQ_PEN_DOWN		BIT(3)
+#define JZ_ADC_IRQ_PEN_UP		BIT(4)
+#define JZ_ADC_IRQ_PEN_DOWN_SLEEP	BIT(5)
+#define JZ_ADC_IRQ_SLEEP		BIT(7)
+
 struct ingenic_adc;
 
 struct ingenic_adc_soc_data {
@@ -411,6 +427,30 @@ static const struct iio_info ingenic_adc_info = {
 };
 
 static const struct iio_chan_spec ingenic_channels[] = {
+	{
+		.extend_name = "touchscreen_xp",
+		.type = IIO_POSITIONRELATIVE,
+		.indexed = 1,
+		.channel = INGENIC_ADC_TOUCH_XP,
+		.scan_index = 0,
+		.scan_type = {
+			.sign = 'u',
+			.realbits = 12,
+			.storagebits = 16
+		},
+	},
+	{
+		.extend_name = "touchscreen_yp",
+		.type = IIO_POSITIONRELATIVE,
+		.indexed = 1,
+		.channel = INGENIC_ADC_TOUCH_YP,
+		.scan_index = 1,
+		.scan_type = {
+			.sign = 'u',
+			.realbits = 12,
+			.storagebits = 16
+		},
+	},
 	{
 		.extend_name = "aux",
 		.type = IIO_VOLTAGE,
@@ -418,6 +458,7 @@ static const struct iio_chan_spec ingenic_channels[] = {
 				      BIT(IIO_CHAN_INFO_SCALE),
 		.indexed = 1,
 		.channel = INGENIC_ADC_AUX,
+		.scan_index = -1
 	},
 	{
 		.extend_name = "battery",
@@ -428,6 +469,7 @@ static const struct iio_chan_spec ingenic_channels[] = {
 						BIT(IIO_CHAN_INFO_SCALE),
 		.indexed = 1,
 		.channel = INGENIC_ADC_BATTERY,
+		.scan_index = -1
 	},
 	{ /* Must always be last in the array. */
 		.extend_name = "aux2",
@@ -436,16 +478,70 @@ static const struct iio_chan_spec ingenic_channels[] = {
 				      BIT(IIO_CHAN_INFO_SCALE),
 		.indexed = 1,
 		.channel = INGENIC_ADC_AUX2,
+		.scan_index = -1
 	},
 };
 
+static int ingenic_adc_buffer_enable(struct iio_dev *iio_dev)
+{
+	struct ingenic_adc *adc = iio_priv(iio_dev);
+
+	clk_enable(adc->clk);
+	/* It takes significant time for the touchscreen hw to stabilize. */
+	msleep(50);
+	ingenic_adc_set_config(adc, JZ_ADC_REG_CFG_TOUCH_OPS_MASK,
+			       JZ_ADC_REG_CFG_SAMPLE_NUM(4) |
+			       JZ_ADC_REG_CFG_PULL_UP(4));
+	writew(80, adc->base + JZ_ADC_REG_ADWAIT);
+	writew(2, adc->base + JZ_ADC_REG_ADSAME);
+	writeb((u8)~JZ_ADC_IRQ_TOUCH, adc->base + JZ_ADC_REG_CTRL);
+	writel(0, adc->base + JZ_ADC_REG_ADTCH);
+	ingenic_adc_enable(adc, 2, true);
+
+	return 0;
+}
+
+static int ingenic_adc_buffer_disable(struct iio_dev *iio_dev)
+{
+	struct ingenic_adc *adc = iio_priv(iio_dev);
+
+	ingenic_adc_enable(adc, 2, false);
+	writeb(0xff, adc->base + JZ_ADC_REG_CTRL);
+	writeb(0xff, adc->base + JZ_ADC_REG_STATUS);
+	ingenic_adc_set_config(adc, JZ_ADC_REG_CFG_TOUCH_OPS_MASK, 0);
+	writew(0, adc->base + JZ_ADC_REG_ADSAME);
+	writew(0, adc->base + JZ_ADC_REG_ADWAIT);
+	clk_disable(adc->clk);
+
+	return 0;
+}
+
+static const struct iio_buffer_setup_ops ingenic_buffer_setup_ops = {
+	.postenable = &ingenic_adc_buffer_enable,
+	.predisable = &ingenic_adc_buffer_disable
+};
+
+static irqreturn_t ingenic_adc_irq(int irq, void *data)
+{
+	struct iio_dev *iio_dev = data;
+	struct ingenic_adc *adc = iio_priv(iio_dev);
+	u32 tdat;
+
+	tdat = readl(adc->base + JZ_ADC_REG_ADTCH);
+	iio_push_to_buffers(iio_dev, &tdat);
+	writeb(JZ_ADC_IRQ_TOUCH, adc->base + JZ_ADC_REG_STATUS);
+
+	return IRQ_HANDLED;
+}
+
 static int ingenic_adc_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct iio_dev *iio_dev;
 	struct ingenic_adc *adc;
 	const struct ingenic_adc_soc_data *soc_data;
-	int ret;
+	struct iio_buffer *buffer;
+	int irq, ret;
 
 	soc_data = device_get_match_data(dev);
 	if (!soc_data)
@@ -460,6 +556,18 @@ static int ingenic_adc_probe(struct platform_device *pdev)
 	mutex_init(&adc->aux_lock);
 	adc->soc_data = soc_data;
 
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0) {
+		dev_err(dev, "Failed to get irq: %d\n", irq);
+		return irq;
+	}
+	ret = devm_request_irq(dev, irq, ingenic_adc_irq, 0,
+			       dev_name(dev), iio_dev);
+	if (ret < 0) {
+		dev_err(dev, "Failed to request irq: %d\n", ret);
+		return ret;
+	}
+
 	adc->base = devm_platform_ioremap_resource(pdev, 0);
 	if (IS_ERR(adc->base))
 		return PTR_ERR(adc->base);
@@ -499,7 +607,8 @@ static int ingenic_adc_probe(struct platform_device *pdev)
 
 	iio_dev->dev.parent = dev;
 	iio_dev->name = "jz-adc";
-	iio_dev->modes = INDIO_DIRECT_MODE;
+	iio_dev->modes = INDIO_DIRECT_MODE | INDIO_BUFFER_SOFTWARE;
+	iio_dev->setup_ops = &ingenic_buffer_setup_ops;
 	iio_dev->channels = ingenic_channels;
 	iio_dev->num_channels = ARRAY_SIZE(ingenic_channels);
 	/* Remove AUX2 from the list of supported channels. */
@@ -507,6 +616,13 @@ static int ingenic_adc_probe(struct platform_device *pdev)
 		iio_dev->num_channels -= 1;
 	iio_dev->info = &ingenic_adc_info;
 
+	buffer = devm_iio_kfifo_allocate(dev);
+	if (!buffer) {
+		dev_err(dev, "Unable to add IIO buffer\n");
+		return -ENOMEM;
+	}
+	iio_device_attach_buffer(iio_dev, buffer);
+
 	ret = devm_iio_device_register(dev, iio_dev);
 	if (ret)
 		dev_err(dev, "Unable to register IIO device\n");
-- 
2.24.1


^ permalink raw reply	[flat|nested] 13+ messages in thread

* [PATCH 4/5] dt-bindings: input: Add docs for ADC driven joystick.
  2020-01-05  0:16 [PATCH 1/5] IIO: Ingenic JZ47xx: Add xlate cb to retrieve correct channel idx Artur Rojek
  2020-01-05  0:16 ` [PATCH 2/5] dt-bindings: iio/adc: Add touchscreen idx for JZ47xx SoC ADC Artur Rojek
  2020-01-05  0:16 ` [PATCH 3/5] IIO: Ingenic JZ47xx: Add touchscreen mode Artur Rojek
@ 2020-01-05  0:16 ` Artur Rojek
  2020-01-08 20:12   ` Rob Herring
  2020-01-05  0:16 ` [PATCH 5/5] input: joystick: Add ADC attached joystick driver Artur Rojek
  3 siblings, 1 reply; 13+ messages in thread
From: Artur Rojek @ 2020-01-05  0:16 UTC (permalink / raw)
  To: Dmitry Torokhov, Rob Herring, Mark Rutland, Jonathan Cameron,
	Paul Cercueil
  Cc: linux-input, devicetree, linux-iio, linux-kernel, Artur Rojek

Add documentation for the adc-joystick driver, used to provide support
for joysticks connected over ADC.

Signed-off-by: Artur Rojek <contact@artur-rojek.eu>
Tested-by: Paul Cercueil <paul@crapouillou.net>
---
 .../bindings/input/adc-joystick.yaml          | 100 ++++++++++++++++++
 1 file changed, 100 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/input/adc-joystick.yaml

diff --git a/Documentation/devicetree/bindings/input/adc-joystick.yaml b/Documentation/devicetree/bindings/input/adc-joystick.yaml
new file mode 100644
index 000000000000..97ae797348c7
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/adc-joystick.yaml
@@ -0,0 +1,100 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+# Copyright 2019-2020 Artur Rojek
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/bindings/input/adc-joystick.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: ADC attached joystick
+
+maintainers:
+  - Artur Rojek <contact@artur-rojek.eu>
+
+description: |
+  Bindings for joystick devices connected to ADC controllers supporting
+  the Industrial I/O subsystem.
+
+properties:
+  compatible:
+    const: adc-joystick
+
+  io-channels:
+    description: |
+      List of phandle and IIO specifier pairs.
+      Each pair defines one ADC channel to which a joystick axis is connected.
+      See Documentation/devicetree/bindings/iio/iio-bindings.txt for details.
+
+required:
+  - compatible
+  - io-channels
+
+additionalProperties: false
+
+patternProperties:
+  "^axis@([0-9])$":
+    type: object
+    description: |
+      Represents a joystick axis bound to the given ADC channel.
+      For each entry in the io-channels list, one axis subnode with a matching
+      index must be specified.
+
+    properties:
+      linux,abs-code:
+        $ref: /schemas/types.yaml#/definitions/uint32
+        description: EV_ABS specific event code generated by the axis.
+
+      linux,abs-range:
+        $ref: /schemas/types.yaml#/definitions/uint32-array
+        items:
+          - description: minimum value
+          - description: maximum value
+        description: |
+          Minimum and maximum values produced by the axis.
+          For an ABS_X axis this will be the left-most and right-most
+          inclination of the joystick. If min > max, it is left to userspace to
+          treat the axis as inverted.
+          This property is interpreted as two signed 32 bit values.
+
+      linux,abs-fuzz:
+        $ref: /schemas/types.yaml#/definitions/uint32
+        description: |
+          Amount of noise in the input value.
+          Omitting this property indicates the axis is precise.
+
+      linux,abs-flat:
+        $ref: /schemas/types.yaml#/definitions/uint32
+        description: |
+          Axial "deadzone", or area around the center position, where the axis
+          is considered to be at rest.
+          Omitting this property indicates the axis always returns to exactly
+          the center position.
+
+    required:
+      - linux,abs-code
+      - linux,abs-range
+
+    additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/iio/adc/ingenic,adc.h>
+    #include <dt-bindings/input/input.h>
+
+    joystick: adc-joystick {
+      compatible = "adc-joystick";
+      io-channels = <&adc INGENIC_ADC_TOUCH_XP>,
+                    <&adc INGENIC_ADC_TOUCH_YP>;
+
+      axis@0 {
+              linux,abs-code = <ABS_X>;
+              linux,abs-range = <3300 0>;
+              linux,abs-fuzz = <4>;
+              linux,abs-flat = <200>;
+      };
+      axis@1 {
+              linux,abs-code = <ABS_Y>;
+              linux,abs-range = <0 3300>;
+              linux,abs-fuzz = <4>;
+              linux,abs-flat = <200>;
+      };
+    };
-- 
2.24.1


^ permalink raw reply	[flat|nested] 13+ messages in thread

* [PATCH 5/5] input: joystick: Add ADC attached joystick driver.
  2020-01-05  0:16 [PATCH 1/5] IIO: Ingenic JZ47xx: Add xlate cb to retrieve correct channel idx Artur Rojek
                   ` (2 preceding siblings ...)
  2020-01-05  0:16 ` [PATCH 4/5] dt-bindings: input: Add docs for ADC driven joystick Artur Rojek
@ 2020-01-05  0:16 ` Artur Rojek
  2020-01-11 11:54   ` Jonathan Cameron
  3 siblings, 1 reply; 13+ messages in thread
From: Artur Rojek @ 2020-01-05  0:16 UTC (permalink / raw)
  To: Dmitry Torokhov, Rob Herring, Mark Rutland, Jonathan Cameron,
	Paul Cercueil
  Cc: linux-input, devicetree, linux-iio, linux-kernel, Artur Rojek

Add a driver for joystick devices connected to ADC controllers
supporting the Industrial I/O subsystem.

Signed-off-by: Artur Rojek <contact@artur-rojek.eu>
Tested-by: Paul Cercueil <paul@crapouillou.net>
---
 drivers/input/joystick/Kconfig        |  10 ++
 drivers/input/joystick/Makefile       |   1 +
 drivers/input/joystick/adc-joystick.c | 230 ++++++++++++++++++++++++++
 3 files changed, 241 insertions(+)
 create mode 100644 drivers/input/joystick/adc-joystick.c

diff --git a/drivers/input/joystick/Kconfig b/drivers/input/joystick/Kconfig
index 940b744639c7..efbc20ec5099 100644
--- a/drivers/input/joystick/Kconfig
+++ b/drivers/input/joystick/Kconfig
@@ -42,6 +42,16 @@ config JOYSTICK_A3D
 	  To compile this driver as a module, choose M here: the
 	  module will be called a3d.
 
+config JOYSTICK_ADC
+	tristate "Simple joystick connected over ADC"
+	depends on IIO
+	select IIO_BUFFER_CB
+	help
+	  Say Y here if you have a simple joystick connected over ADC.
+
+	  To compile this driver as a module, choose M here: the
+	  module will be called adc-joystick.
+
 config JOYSTICK_ADI
 	tristate "Logitech ADI digital joysticks and gamepads"
 	select GAMEPORT
diff --git a/drivers/input/joystick/Makefile b/drivers/input/joystick/Makefile
index 8656023f6ef5..58232b3057d3 100644
--- a/drivers/input/joystick/Makefile
+++ b/drivers/input/joystick/Makefile
@@ -6,6 +6,7 @@
 # Each configuration option enables a list of files.
 
 obj-$(CONFIG_JOYSTICK_A3D)		+= a3d.o
+obj-$(CONFIG_JOYSTICK_ADC)		+= adc-joystick.o
 obj-$(CONFIG_JOYSTICK_ADI)		+= adi.o
 obj-$(CONFIG_JOYSTICK_AMIGA)		+= amijoy.o
 obj-$(CONFIG_JOYSTICK_AS5011)		+= as5011.o
diff --git a/drivers/input/joystick/adc-joystick.c b/drivers/input/joystick/adc-joystick.c
new file mode 100644
index 000000000000..0dfc4218dafa
--- /dev/null
+++ b/drivers/input/joystick/adc-joystick.c
@@ -0,0 +1,230 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Input driver for joysticks connected over ADC.
+ * Copyright (c) 2019-2020 Artur Rojek <contact@artur-rojek.eu>
+ */
+#include <linux/ctype.h>
+#include <linux/input.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/consumer.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/property.h>
+
+struct adc_joystick_axis {
+	u32 code;
+	s32 range[2];
+	s32 fuzz;
+	s32 flat;
+};
+
+struct adc_joystick {
+	struct input_dev *input;
+	struct iio_cb_buffer *buffer;
+	struct adc_joystick_axis *axes;
+	struct iio_channel *chans;
+	int num_chans;
+};
+
+static int adc_joystick_handle(const void *data, void *private)
+{
+	struct adc_joystick *joy = private;
+	enum iio_endian endianness;
+	int bytes, msb, val, i;
+	bool sign;
+
+	/* Assume all channels have the same storage size. */
+	bytes = joy->chans[0].channel->scan_type.storagebits >> 3;
+
+	for (i = 0; i < joy->num_chans; ++i) {
+		endianness = joy->chans[i].channel->scan_type.endianness;
+		msb = joy->chans[i].channel->scan_type.realbits - 1;
+		sign = (tolower(joy->chans[i].channel->scan_type.sign) == 's');
+
+		switch (bytes) {
+		case 1:
+			val = ((const u8 *)data)[i];
+			break;
+		case 2:
+			val = ((const u16 *)data)[i];
+			if (endianness == IIO_BE)
+				val = be16_to_cpu(val);
+			else if (endianness == IIO_LE)
+				val = le16_to_cpu(val);
+			break;
+		default:
+			return -EINVAL;
+		}
+
+		val >>= joy->chans[i].channel->scan_type.shift;
+		if (sign)
+			val = sign_extend32(val, msb);
+		else
+			val &= GENMASK(msb, 0);
+		input_report_abs(joy->input, joy->axes[i].code, val);
+	}
+
+	input_sync(joy->input);
+
+	return 0;
+}
+
+static int adc_joystick_open(struct input_dev *dev)
+{
+	struct adc_joystick *joy = input_get_drvdata(dev);
+	int ret;
+
+	ret = iio_channel_start_all_cb(joy->buffer);
+	if (ret)
+		dev_err(dev->dev.parent, "Unable to start callback buffer");
+
+	return ret;
+}
+
+static void adc_joystick_close(struct input_dev *dev)
+{
+	struct adc_joystick *joy = input_get_drvdata(dev);
+
+	iio_channel_stop_all_cb(joy->buffer);
+}
+
+static void adc_joystick_disable(void *data)
+{
+	iio_channel_release_all_cb(data);
+}
+
+static int adc_joystick_set_axes(struct device *dev, struct adc_joystick *joy)
+{
+	struct adc_joystick_axis *axes;
+	struct fwnode_handle *child;
+	int num_axes, i = 0;
+
+	num_axes = device_get_child_node_count(dev);
+	if (!num_axes) {
+		dev_err(dev, "Unable to find child nodes");
+		return -EINVAL;
+	}
+
+	if (num_axes != joy->num_chans) {
+		dev_err(dev, "Got %d child nodes for %d channels",
+			num_axes, joy->num_chans);
+		return -EINVAL;
+	}
+
+	axes = devm_kmalloc_array(dev, num_axes, sizeof(*axes), GFP_KERNEL);
+	if (!axes)
+		return -ENOMEM;
+
+	device_for_each_child_node(dev, child) {
+		if (fwnode_property_read_u32(child, "linux,abs-code",
+					     &axes[i].code)) {
+			dev_err(dev, "linux,abs-code invalid or missing");
+			goto err;
+		}
+
+		if (fwnode_property_read_u32_array(child, "linux,abs-range",
+						   axes[i].range, 2)) {
+			dev_err(dev, "linux,abs-range invalid or missing");
+			goto err;
+		}
+
+		fwnode_property_read_u32(child, "linux,abs-fuzz",
+					 &axes[i].fuzz);
+		fwnode_property_read_u32(child, "linux,abs-flat",
+					 &axes[i].flat);
+
+		input_set_abs_params(joy->input, axes[i].code, axes[i].range[0],
+				     axes[i].range[1], axes[i].fuzz,
+				     axes[i].flat);
+		input_set_capability(joy->input, EV_ABS, axes[i].code);
+
+		++i;
+	}
+
+	joy->axes = axes;
+
+	return 0;
+
+err:
+	fwnode_handle_put(child);
+	return -EINVAL;
+}
+
+static int adc_joystick_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct adc_joystick *joy;
+	struct input_dev *input;
+	int ret;
+
+	joy = devm_kzalloc(dev, sizeof(*joy), GFP_KERNEL);
+	if (!joy)
+		return -ENOMEM;
+
+	joy->chans = devm_iio_channel_get_all(dev);
+	if (IS_ERR(joy->chans)) {
+		ret = PTR_ERR(joy->chans);
+		if (ret != -EPROBE_DEFER)
+			dev_err(dev, "Unable to get IIO channels");
+		return ret;
+	}
+
+	/* Count how many channels we got. NULL terminated. */
+	while (joy->chans[joy->num_chans].indio_dev)
+		joy->num_chans++;
+
+	input = devm_input_allocate_device(dev);
+	if (!input) {
+		dev_err(dev, "Unable to allocate input device");
+		return -ENOMEM;
+	}
+
+	joy->input = input;
+	input->name = pdev->name;
+	input->id.bustype = BUS_HOST;
+	input->open = adc_joystick_open;
+	input->close = adc_joystick_close;
+
+	ret = adc_joystick_set_axes(dev, joy);
+	if (ret)
+		return ret;
+
+	input_set_drvdata(input, joy);
+	ret = input_register_device(input);
+	if (ret) {
+		dev_err(dev, "Unable to register input device: %d", ret);
+		return ret;
+	}
+
+	joy->buffer = iio_channel_get_all_cb(dev, adc_joystick_handle, joy);
+	if (IS_ERR(joy->buffer)) {
+		dev_err(dev, "Unable to allocate callback buffer");
+		return PTR_ERR(joy->buffer);
+	}
+
+	ret = devm_add_action_or_reset(dev, adc_joystick_disable, joy->buffer);
+	if (ret)
+		dev_err(dev, "Unable to add action");
+
+	return ret;
+}
+
+static const struct of_device_id adc_joystick_of_match[] = {
+	{ .compatible = "adc-joystick", },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, adc_joystick_of_match);
+
+static struct platform_driver adc_joystick_driver = {
+	.driver = {
+		.name = "adc-joystick",
+		.of_match_table = of_match_ptr(adc_joystick_of_match),
+	},
+	.probe = adc_joystick_probe,
+};
+module_platform_driver(adc_joystick_driver);
+
+MODULE_DESCRIPTION("Input driver for joysticks connected over ADC");
+MODULE_AUTHOR("Artur Rojek <contact@artur-rojek.eu>");
+MODULE_LICENSE("GPL");
-- 
2.24.1


^ permalink raw reply	[flat|nested] 13+ messages in thread

* Re: [PATCH 2/5] dt-bindings: iio/adc: Add touchscreen idx for JZ47xx SoC ADC
  2020-01-05  0:16 ` [PATCH 2/5] dt-bindings: iio/adc: Add touchscreen idx for JZ47xx SoC ADC Artur Rojek
@ 2020-01-08 16:59   ` Rob Herring
  0 siblings, 0 replies; 13+ messages in thread
From: Rob Herring @ 2020-01-08 16:59 UTC (permalink / raw)
  To: Artur Rojek
  Cc: Dmitry Torokhov, Mark Rutland, Jonathan Cameron, Paul Cercueil,
	linux-input, devicetree, linux-iio, linux-kernel, Artur Rojek

On Sun,  5 Jan 2020 01:16:36 +0100, Artur Rojek wrote:
> Introduce support for touchscreen channels found in JZ47xx SoCs.
> 
> Signed-off-by: Artur Rojek <contact@artur-rojek.eu>
> Tested-by: Paul Cercueil <paul@crapouillou.net>
> ---
>  include/dt-bindings/iio/adc/ingenic,adc.h | 2 ++
>  1 file changed, 2 insertions(+)
> 

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

^ permalink raw reply	[flat|nested] 13+ messages in thread

* Re: [PATCH 4/5] dt-bindings: input: Add docs for ADC driven joystick.
  2020-01-05  0:16 ` [PATCH 4/5] dt-bindings: input: Add docs for ADC driven joystick Artur Rojek
@ 2020-01-08 20:12   ` Rob Herring
  0 siblings, 0 replies; 13+ messages in thread
From: Rob Herring @ 2020-01-08 20:12 UTC (permalink / raw)
  To: Artur Rojek
  Cc: Dmitry Torokhov, Mark Rutland, Jonathan Cameron, Paul Cercueil,
	linux-input, devicetree, linux-iio, linux-kernel

On Sun, Jan 05, 2020 at 01:16:38AM +0100, Artur Rojek wrote:
> Add documentation for the adc-joystick driver, used to provide support
> for joysticks connected over ADC.
> 
> Signed-off-by: Artur Rojek <contact@artur-rojek.eu>
> Tested-by: Paul Cercueil <paul@crapouillou.net>
> ---
>  .../bindings/input/adc-joystick.yaml          | 100 ++++++++++++++++++
>  1 file changed, 100 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/input/adc-joystick.yaml
> 
> diff --git a/Documentation/devicetree/bindings/input/adc-joystick.yaml b/Documentation/devicetree/bindings/input/adc-joystick.yaml
> new file mode 100644
> index 000000000000..97ae797348c7
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/input/adc-joystick.yaml
> @@ -0,0 +1,100 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +# Copyright 2019-2020 Artur Rojek
> +%YAML 1.2
> +---
> +$id: "http://devicetree.org/schemas/bindings/input/adc-joystick.yaml#"
> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
> +
> +title: ADC attached joystick
> +
> +maintainers:
> +  - Artur Rojek <contact@artur-rojek.eu>
> +
> +description: |
> +  Bindings for joystick devices connected to ADC controllers supporting
> +  the Industrial I/O subsystem.
> +
> +properties:
> +  compatible:
> +    const: adc-joystick
> +
> +  io-channels:
> +    description: |
> +      List of phandle and IIO specifier pairs.
> +      Each pair defines one ADC channel to which a joystick axis is connected.
> +      See Documentation/devicetree/bindings/iio/iio-bindings.txt for details.
> +
> +required:
> +  - compatible
> +  - io-channels
> +
> +additionalProperties: false
> +
> +patternProperties:
> +  "^axis@([0-9])$":

A unit-address means there should be a 'reg' property. I'd just do 
axis-x and axis-y instead.

> +    type: object
> +    description: |
> +      Represents a joystick axis bound to the given ADC channel.
> +      For each entry in the io-channels list, one axis subnode with a matching
> +      index must be specified.
> +
> +    properties:
> +      linux,abs-code:
> +        $ref: /schemas/types.yaml#/definitions/uint32
> +        description: EV_ABS specific event code generated by the axis.

Existing 'linux,code' should be used here.

> +
> +      linux,abs-range:

Drop 'linux,' here and on the rest of these.

> +        $ref: /schemas/types.yaml#/definitions/uint32-array
> +        items:
> +          - description: minimum value
> +          - description: maximum value
> +        description: |
> +          Minimum and maximum values produced by the axis.
> +          For an ABS_X axis this will be the left-most and right-most
> +          inclination of the joystick. If min > max, it is left to userspace to
> +          treat the axis as inverted.
> +          This property is interpreted as two signed 32 bit values.
> +
> +      linux,abs-fuzz:
> +        $ref: /schemas/types.yaml#/definitions/uint32
> +        description: |
> +          Amount of noise in the input value.
> +          Omitting this property indicates the axis is precise.
> +
> +      linux,abs-flat:
> +        $ref: /schemas/types.yaml#/definitions/uint32
> +        description: |
> +          Axial "deadzone", or area around the center position, where the axis
> +          is considered to be at rest.
> +          Omitting this property indicates the axis always returns to exactly
> +          the center position.
> +
> +    required:
> +      - linux,abs-code
> +      - linux,abs-range
> +
> +    additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/iio/adc/ingenic,adc.h>
> +    #include <dt-bindings/input/input.h>
> +
> +    joystick: adc-joystick {
> +      compatible = "adc-joystick";
> +      io-channels = <&adc INGENIC_ADC_TOUCH_XP>,
> +                    <&adc INGENIC_ADC_TOUCH_YP>;
> +
> +      axis@0 {
> +              linux,abs-code = <ABS_X>;
> +              linux,abs-range = <3300 0>;
> +              linux,abs-fuzz = <4>;
> +              linux,abs-flat = <200>;
> +      };
> +      axis@1 {
> +              linux,abs-code = <ABS_Y>;
> +              linux,abs-range = <0 3300>;
> +              linux,abs-fuzz = <4>;
> +              linux,abs-flat = <200>;
> +      };
> +    };
> -- 
> 2.24.1
> 

^ permalink raw reply	[flat|nested] 13+ messages in thread

* Re: [PATCH 3/5] IIO: Ingenic JZ47xx: Add touchscreen mode.
  2020-01-05  0:16 ` [PATCH 3/5] IIO: Ingenic JZ47xx: Add touchscreen mode Artur Rojek
@ 2020-01-11 11:46   ` Jonathan Cameron
  2020-01-13 14:59     ` Paul Cercueil
  0 siblings, 1 reply; 13+ messages in thread
From: Jonathan Cameron @ 2020-01-11 11:46 UTC (permalink / raw)
  To: Artur Rojek
  Cc: Dmitry Torokhov, Rob Herring, Mark Rutland, Jonathan Cameron,
	Paul Cercueil, linux-input, devicetree, linux-iio, linux-kernel

On Sun,  5 Jan 2020 01:16:37 +0100
Artur Rojek <contact@artur-rojek.eu> wrote:

> Implement support for the touchscreen mode found in JZ47xx SoCs ADC.
This needs more description.  

Looks like it enables a kfifo and also selects the callback buffer
stuff to run with a generic touchscreen iio-> input driver.

A few other bits inline, but basically fine.

I've never really thought about whether we support a CB buffer
without anything on the IIO side.   That should be possible,
but I'm not sure what odd corner cases will turn up.  I'm guessing
there are some, or you'd not have bothered exposing it here?

Thanks

Jonathan


> 
> Signed-off-by: Artur Rojek <contact@artur-rojek.eu>
> Tested-by: Paul Cercueil <paul@crapouillou.net>
> ---
>  drivers/iio/adc/Kconfig       |   3 +
>  drivers/iio/adc/ingenic-adc.c | 120 +++++++++++++++++++++++++++++++++-
>  2 files changed, 121 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
> index 5d8540b7b427..dabbf15032af 100644
> --- a/drivers/iio/adc/Kconfig
> +++ b/drivers/iio/adc/Kconfig
> @@ -446,6 +446,9 @@ config INA2XX_ADC
>  config INGENIC_ADC
>  	tristate "Ingenic JZ47xx SoCs ADC driver"
>  	depends on MIPS || COMPILE_TEST
> +	select IIO_BUFFER
> +	select IIO_BUFFER_CB

Feels like IIO_BUFFER_CB should be selected by the driver that
uses that functionality rather than this one.

> +	select IIO_KFIFO_BUF
>  	help
>  	  Say yes here to build support for the Ingenic JZ47xx SoCs ADC unit.
>  
> diff --git a/drivers/iio/adc/ingenic-adc.c b/drivers/iio/adc/ingenic-adc.c
> index 7a24bc1dabe1..4dbf15fdd95d 100644
> --- a/drivers/iio/adc/ingenic-adc.c
> +++ b/drivers/iio/adc/ingenic-adc.c
> @@ -8,7 +8,10 @@
>  
>  #include <dt-bindings/iio/adc/ingenic,adc.h>
>  #include <linux/clk.h>
> +#include <linux/iio/buffer.h>
>  #include <linux/iio/iio.h>
> +#include <linux/iio/kfifo_buf.h>
> +#include <linux/interrupt.h>
>  #include <linux/io.h>
>  #include <linux/iopoll.h>
>  #include <linux/kernel.h>
> @@ -20,6 +23,8 @@
>  #define JZ_ADC_REG_CFG			0x04
>  #define JZ_ADC_REG_CTRL			0x08
>  #define JZ_ADC_REG_STATUS		0x0c
> +#define JZ_ADC_REG_ADSAME		0x10
> +#define JZ_ADC_REG_ADWAIT		0x14
>  #define JZ_ADC_REG_ADTCH		0x18
>  #define JZ_ADC_REG_ADBDAT		0x1c
>  #define JZ_ADC_REG_ADSDAT		0x20
> @@ -28,6 +33,9 @@
>  #define JZ_ADC_REG_ENABLE_PD		BIT(7)
>  #define JZ_ADC_REG_CFG_AUX_MD		(BIT(0) | BIT(1))
>  #define JZ_ADC_REG_CFG_BAT_MD		BIT(4)
> +#define JZ_ADC_REG_CFG_PULL_UP(n)	((n) << 16)
> +#define JZ_ADC_REG_CFG_SAMPLE_NUM(n)	((n) << 10)
> +#define JZ_ADC_REG_CFG_TOUCH_OPS_MASK	(BIT(31) | GENMASK(23, 10))
>  #define JZ_ADC_REG_ADCLK_CLKDIV_LSB	0
>  #define JZ4725B_ADC_REG_ADCLK_CLKDIV10US_LSB	16
>  #define JZ4770_ADC_REG_ADCLK_CLKDIV10US_LSB	8
> @@ -44,6 +52,14 @@
>  #define JZ4770_ADC_BATTERY_VREF			6600
>  #define JZ4770_ADC_BATTERY_VREF_BITS		12
>  
> +#define JZ_ADC_IRQ_AUX			BIT(0)
> +#define JZ_ADC_IRQ_BATTERY		BIT(1)
> +#define JZ_ADC_IRQ_TOUCH		BIT(2)
> +#define JZ_ADC_IRQ_PEN_DOWN		BIT(3)
> +#define JZ_ADC_IRQ_PEN_UP		BIT(4)
> +#define JZ_ADC_IRQ_PEN_DOWN_SLEEP	BIT(5)
> +#define JZ_ADC_IRQ_SLEEP		BIT(7)
> +
>  struct ingenic_adc;
>  
>  struct ingenic_adc_soc_data {
> @@ -411,6 +427,30 @@ static const struct iio_info ingenic_adc_info = {
>  };
>  
>  static const struct iio_chan_spec ingenic_channels[] = {
> +	{
> +		.extend_name = "touchscreen_xp",

Note that adding extended names:

1) Needs documenting as it create ABI - so something in
Documentation/ABI/testing/sysfs-bus-iio-*

2) Breaks any generic userspace application.

Why can't we use modified and an axis to identify this?


> +		.type = IIO_POSITIONRELATIVE,
> +		.indexed = 1,
> +		.channel = INGENIC_ADC_TOUCH_XP,
> +		.scan_index = 0,
> +		.scan_type = {
> +			.sign = 'u',
> +			.realbits = 12,
> +			.storagebits = 16
> +		},
> +	},
> +	{
> +		.extend_name = "touchscreen_yp",
> +		.type = IIO_POSITIONRELATIVE,
> +		.indexed = 1,
> +		.channel = INGENIC_ADC_TOUCH_YP,
> +		.scan_index = 1,
> +		.scan_type = {
> +			.sign = 'u',
> +			.realbits = 12,
> +			.storagebits = 16
> +		},
> +	},
>  	{
>  		.extend_name = "aux",
>  		.type = IIO_VOLTAGE,
> @@ -418,6 +458,7 @@ static const struct iio_chan_spec ingenic_channels[] = {
>  				      BIT(IIO_CHAN_INFO_SCALE),
>  		.indexed = 1,
>  		.channel = INGENIC_ADC_AUX,
> +		.scan_index = -1
>  	},
>  	{
>  		.extend_name = "battery",
> @@ -428,6 +469,7 @@ static const struct iio_chan_spec ingenic_channels[] = {
>  						BIT(IIO_CHAN_INFO_SCALE),
>  		.indexed = 1,
>  		.channel = INGENIC_ADC_BATTERY,
> +		.scan_index = -1
>  	},
>  	{ /* Must always be last in the array. */
>  		.extend_name = "aux2",
> @@ -436,16 +478,70 @@ static const struct iio_chan_spec ingenic_channels[] = {
>  				      BIT(IIO_CHAN_INFO_SCALE),
>  		.indexed = 1,
>  		.channel = INGENIC_ADC_AUX2,
> +		.scan_index = -1
>  	},
>  };
>  
> +static int ingenic_adc_buffer_enable(struct iio_dev *iio_dev)
> +{
> +	struct ingenic_adc *adc = iio_priv(iio_dev);
> +
> +	clk_enable(adc->clk);
> +	/* It takes significant time for the touchscreen hw to stabilize. */
> +	msleep(50);
> +	ingenic_adc_set_config(adc, JZ_ADC_REG_CFG_TOUCH_OPS_MASK,
> +			       JZ_ADC_REG_CFG_SAMPLE_NUM(4) |
> +			       JZ_ADC_REG_CFG_PULL_UP(4));
> +	writew(80, adc->base + JZ_ADC_REG_ADWAIT);
> +	writew(2, adc->base + JZ_ADC_REG_ADSAME);
> +	writeb((u8)~JZ_ADC_IRQ_TOUCH, adc->base + JZ_ADC_REG_CTRL);
> +	writel(0, adc->base + JZ_ADC_REG_ADTCH);
> +	ingenic_adc_enable(adc, 2, true);
> +
> +	return 0;
> +}
> +
> +static int ingenic_adc_buffer_disable(struct iio_dev *iio_dev)
> +{
> +	struct ingenic_adc *adc = iio_priv(iio_dev);
> +
> +	ingenic_adc_enable(adc, 2, false);
> +	writeb(0xff, adc->base + JZ_ADC_REG_CTRL);
> +	writeb(0xff, adc->base + JZ_ADC_REG_STATUS);
> +	ingenic_adc_set_config(adc, JZ_ADC_REG_CFG_TOUCH_OPS_MASK, 0);
> +	writew(0, adc->base + JZ_ADC_REG_ADSAME);
> +	writew(0, adc->base + JZ_ADC_REG_ADWAIT);
> +	clk_disable(adc->clk);
> +
> +	return 0;
> +}
> +
> +static const struct iio_buffer_setup_ops ingenic_buffer_setup_ops = {
> +	.postenable = &ingenic_adc_buffer_enable,
> +	.predisable = &ingenic_adc_buffer_disable
> +};
> +
> +static irqreturn_t ingenic_adc_irq(int irq, void *data)
> +{
> +	struct iio_dev *iio_dev = data;
> +	struct ingenic_adc *adc = iio_priv(iio_dev);
> +	u32 tdat;
> +
> +	tdat = readl(adc->base + JZ_ADC_REG_ADTCH);
> +	iio_push_to_buffers(iio_dev, &tdat);
> +	writeb(JZ_ADC_IRQ_TOUCH, adc->base + JZ_ADC_REG_STATUS);
> +
> +	return IRQ_HANDLED;
> +}
> +
>  static int ingenic_adc_probe(struct platform_device *pdev)
>  {
>  	struct device *dev = &pdev->dev;
>  	struct iio_dev *iio_dev;
>  	struct ingenic_adc *adc;
>  	const struct ingenic_adc_soc_data *soc_data;
> -	int ret;
> +	struct iio_buffer *buffer;
> +	int irq, ret;
>  
>  	soc_data = device_get_match_data(dev);
>  	if (!soc_data)
> @@ -460,6 +556,18 @@ static int ingenic_adc_probe(struct platform_device *pdev)
>  	mutex_init(&adc->aux_lock);
>  	adc->soc_data = soc_data;
>  
> +	irq = platform_get_irq(pdev, 0);
> +	if (irq < 0) {
> +		dev_err(dev, "Failed to get irq: %d\n", irq);
> +		return irq;
> +	}
> +	ret = devm_request_irq(dev, irq, ingenic_adc_irq, 0,
> +			       dev_name(dev), iio_dev);
> +	if (ret < 0) {
> +		dev_err(dev, "Failed to request irq: %d\n", ret);
> +		return ret;
> +	}
> +
>  	adc->base = devm_platform_ioremap_resource(pdev, 0);
>  	if (IS_ERR(adc->base))
>  		return PTR_ERR(adc->base);
> @@ -499,7 +607,8 @@ static int ingenic_adc_probe(struct platform_device *pdev)
>  
>  	iio_dev->dev.parent = dev;
>  	iio_dev->name = "jz-adc";
> -	iio_dev->modes = INDIO_DIRECT_MODE;
> +	iio_dev->modes = INDIO_DIRECT_MODE | INDIO_BUFFER_SOFTWARE;
> +	iio_dev->setup_ops = &ingenic_buffer_setup_ops;
>  	iio_dev->channels = ingenic_channels;
>  	iio_dev->num_channels = ARRAY_SIZE(ingenic_channels);
>  	/* Remove AUX2 from the list of supported channels. */
> @@ -507,6 +616,13 @@ static int ingenic_adc_probe(struct platform_device *pdev)
>  		iio_dev->num_channels -= 1;
>  	iio_dev->info = &ingenic_adc_info;
>  
> +	buffer = devm_iio_kfifo_allocate(dev);
> +	if (!buffer) {
> +		dev_err(dev, "Unable to add IIO buffer\n");
> +		return -ENOMEM;
> +	}
> +	iio_device_attach_buffer(iio_dev, buffer);
> +
>  	ret = devm_iio_device_register(dev, iio_dev);
>  	if (ret)
>  		dev_err(dev, "Unable to register IIO device\n");


^ permalink raw reply	[flat|nested] 13+ messages in thread

* Re: [PATCH 5/5] input: joystick: Add ADC attached joystick driver.
  2020-01-05  0:16 ` [PATCH 5/5] input: joystick: Add ADC attached joystick driver Artur Rojek
@ 2020-01-11 11:54   ` Jonathan Cameron
  2020-01-20 19:39     ` Dmitry Torokhov
  0 siblings, 1 reply; 13+ messages in thread
From: Jonathan Cameron @ 2020-01-11 11:54 UTC (permalink / raw)
  To: Artur Rojek
  Cc: Dmitry Torokhov, Rob Herring, Mark Rutland, Jonathan Cameron,
	Paul Cercueil, linux-input, devicetree, linux-iio, linux-kernel

On Sun,  5 Jan 2020 01:16:39 +0100
Artur Rojek <contact@artur-rojek.eu> wrote:

> Add a driver for joystick devices connected to ADC controllers
> supporting the Industrial I/O subsystem.
> 
> Signed-off-by: Artur Rojek <contact@artur-rojek.eu>
> Tested-by: Paul Cercueil <paul@crapouillou.net>

Looks pretty good, but I'd like to see a little more sanity checking
on probe that the channels are in a format this driver can actually
handle.  Given we can check channel size and consistency etc early
it would be better to fail to probe than just report error data later.

Thanks,

Jonathan

> ---
>  drivers/input/joystick/Kconfig        |  10 ++
>  drivers/input/joystick/Makefile       |   1 +
>  drivers/input/joystick/adc-joystick.c | 230 ++++++++++++++++++++++++++
>  3 files changed, 241 insertions(+)
>  create mode 100644 drivers/input/joystick/adc-joystick.c
> 
> diff --git a/drivers/input/joystick/Kconfig b/drivers/input/joystick/Kconfig
> index 940b744639c7..efbc20ec5099 100644
> --- a/drivers/input/joystick/Kconfig
> +++ b/drivers/input/joystick/Kconfig
> @@ -42,6 +42,16 @@ config JOYSTICK_A3D
>  	  To compile this driver as a module, choose M here: the
>  	  module will be called a3d.
>  
> +config JOYSTICK_ADC
> +	tristate "Simple joystick connected over ADC"
> +	depends on IIO
> +	select IIO_BUFFER_CB
> +	help
> +	  Say Y here if you have a simple joystick connected over ADC.
> +
> +	  To compile this driver as a module, choose M here: the
> +	  module will be called adc-joystick.
> +
>  config JOYSTICK_ADI
>  	tristate "Logitech ADI digital joysticks and gamepads"
>  	select GAMEPORT
> diff --git a/drivers/input/joystick/Makefile b/drivers/input/joystick/Makefile
> index 8656023f6ef5..58232b3057d3 100644
> --- a/drivers/input/joystick/Makefile
> +++ b/drivers/input/joystick/Makefile
> @@ -6,6 +6,7 @@
>  # Each configuration option enables a list of files.
>  
>  obj-$(CONFIG_JOYSTICK_A3D)		+= a3d.o
> +obj-$(CONFIG_JOYSTICK_ADC)		+= adc-joystick.o
>  obj-$(CONFIG_JOYSTICK_ADI)		+= adi.o
>  obj-$(CONFIG_JOYSTICK_AMIGA)		+= amijoy.o
>  obj-$(CONFIG_JOYSTICK_AS5011)		+= as5011.o
> diff --git a/drivers/input/joystick/adc-joystick.c b/drivers/input/joystick/adc-joystick.c
> new file mode 100644
> index 000000000000..0dfc4218dafa
> --- /dev/null
> +++ b/drivers/input/joystick/adc-joystick.c
> @@ -0,0 +1,230 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Input driver for joysticks connected over ADC.
> + * Copyright (c) 2019-2020 Artur Rojek <contact@artur-rojek.eu>
> + */
> +#include <linux/ctype.h>
> +#include <linux/input.h>
> +#include <linux/iio/iio.h>
> +#include <linux/iio/consumer.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/platform_device.h>
> +#include <linux/property.h>
> +
> +struct adc_joystick_axis {
> +	u32 code;
> +	s32 range[2];
> +	s32 fuzz;
> +	s32 flat;
> +};
> +
> +struct adc_joystick {
> +	struct input_dev *input;
> +	struct iio_cb_buffer *buffer;
> +	struct adc_joystick_axis *axes;
> +	struct iio_channel *chans;
> +	int num_chans;
> +};
> +
> +static int adc_joystick_handle(const void *data, void *private)
> +{
> +	struct adc_joystick *joy = private;
> +	enum iio_endian endianness;
> +	int bytes, msb, val, i;
> +	bool sign;
> +
> +	/* Assume all channels have the same storage size. */

Would be better to check that and report an error if not!

> +	bytes = joy->chans[0].channel->scan_type.storagebits >> 3;
> +
> +	for (i = 0; i < joy->num_chans; ++i) {
> +		endianness = joy->chans[i].channel->scan_type.endianness;
> +		msb = joy->chans[i].channel->scan_type.realbits - 1;
> +		sign = (tolower(joy->chans[i].channel->scan_type.sign) == 's');
> +
> +		switch (bytes) {
> +		case 1:
> +			val = ((const u8 *)data)[i];
> +			break;
> +		case 2:
> +			val = ((const u16 *)data)[i];
> +			if (endianness == IIO_BE)
> +				val = be16_to_cpu(val);
> +			else if (endianness == IIO_LE)
> +				val = le16_to_cpu(val);
> +			break;
> +		default:

Good to have sanity checked this earlier and refused to probe.

> +			return -EINVAL;
> +		}
> +
> +		val >>= joy->chans[i].channel->scan_type.shift;
> +		if (sign)
> +			val = sign_extend32(val, msb);
> +		else
> +			val &= GENMASK(msb, 0);
> +		input_report_abs(joy->input, joy->axes[i].code, val);
> +	}
> +
> +	input_sync(joy->input);
> +
> +	return 0;
> +}
> +
> +static int adc_joystick_open(struct input_dev *dev)
> +{
> +	struct adc_joystick *joy = input_get_drvdata(dev);
> +	int ret;
> +
> +	ret = iio_channel_start_all_cb(joy->buffer);
> +	if (ret)
> +		dev_err(dev->dev.parent, "Unable to start callback buffer");
> +
> +	return ret;
> +}
> +
> +static void adc_joystick_close(struct input_dev *dev)
> +{
> +	struct adc_joystick *joy = input_get_drvdata(dev);
> +
> +	iio_channel_stop_all_cb(joy->buffer);
> +}
> +
> +static void adc_joystick_disable(void *data)
> +{
> +	iio_channel_release_all_cb(data);

Given what it does, and the fact it basically matches the iio_channel_get_all_cb call,
seems like an odd name for this function.

> +}
> +
> +static int adc_joystick_set_axes(struct device *dev, struct adc_joystick *joy)
> +{
> +	struct adc_joystick_axis *axes;
> +	struct fwnode_handle *child;
> +	int num_axes, i = 0;
> +
> +	num_axes = device_get_child_node_count(dev);
> +	if (!num_axes) {
> +		dev_err(dev, "Unable to find child nodes");
> +		return -EINVAL;
> +	}
> +
> +	if (num_axes != joy->num_chans) {
> +		dev_err(dev, "Got %d child nodes for %d channels",
> +			num_axes, joy->num_chans);
> +		return -EINVAL;
> +	}
> +
> +	axes = devm_kmalloc_array(dev, num_axes, sizeof(*axes), GFP_KERNEL);
> +	if (!axes)
> +		return -ENOMEM;
> +
> +	device_for_each_child_node(dev, child) {
> +		if (fwnode_property_read_u32(child, "linux,abs-code",
> +					     &axes[i].code)) {
> +			dev_err(dev, "linux,abs-code invalid or missing");
> +			goto err;
> +		}
> +
> +		if (fwnode_property_read_u32_array(child, "linux,abs-range",
> +						   axes[i].range, 2)) {
> +			dev_err(dev, "linux,abs-range invalid or missing");
> +			goto err;
> +		}
> +
> +		fwnode_property_read_u32(child, "linux,abs-fuzz",
> +					 &axes[i].fuzz);
> +		fwnode_property_read_u32(child, "linux,abs-flat",
> +					 &axes[i].flat);
> +
> +		input_set_abs_params(joy->input, axes[i].code, axes[i].range[0],
> +				     axes[i].range[1], axes[i].fuzz,
> +				     axes[i].flat);
> +		input_set_capability(joy->input, EV_ABS, axes[i].code);
> +
> +		++i;
> +	}
> +
> +	joy->axes = axes;
> +
> +	return 0;
> +
> +err:
> +	fwnode_handle_put(child);
> +	return -EINVAL;
> +}
> +
> +static int adc_joystick_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct adc_joystick *joy;
> +	struct input_dev *input;
> +	int ret;
> +
> +	joy = devm_kzalloc(dev, sizeof(*joy), GFP_KERNEL);
> +	if (!joy)
> +		return -ENOMEM;
> +
> +	joy->chans = devm_iio_channel_get_all(dev);
> +	if (IS_ERR(joy->chans)) {
> +		ret = PTR_ERR(joy->chans);
> +		if (ret != -EPROBE_DEFER)
> +			dev_err(dev, "Unable to get IIO channels");
> +		return ret;
> +	}
> +
> +	/* Count how many channels we got. NULL terminated. */
> +	while (joy->chans[joy->num_chans].indio_dev)
> +		joy->num_chans++;
> +
> +	input = devm_input_allocate_device(dev);
> +	if (!input) {
> +		dev_err(dev, "Unable to allocate input device");
> +		return -ENOMEM;
> +	}
> +
> +	joy->input = input;
> +	input->name = pdev->name;
> +	input->id.bustype = BUS_HOST;
> +	input->open = adc_joystick_open;
> +	input->close = adc_joystick_close;
> +
> +	ret = adc_joystick_set_axes(dev, joy);
> +	if (ret)
> +		return ret;
> +
> +	input_set_drvdata(input, joy);
> +	ret = input_register_device(input);
> +	if (ret) {
> +		dev_err(dev, "Unable to register input device: %d", ret);
> +		return ret;
> +	}
> +
> +	joy->buffer = iio_channel_get_all_cb(dev, adc_joystick_handle, joy);
> +	if (IS_ERR(joy->buffer)) {
> +		dev_err(dev, "Unable to allocate callback buffer");
> +		return PTR_ERR(joy->buffer);
> +	}
> +
> +	ret = devm_add_action_or_reset(dev, adc_joystick_disable, joy->buffer);
> +	if (ret)
> +		dev_err(dev, "Unable to add action");
> +
> +	return ret;
> +}
> +
> +static const struct of_device_id adc_joystick_of_match[] = {
> +	{ .compatible = "adc-joystick", },
> +	{ },
> +};
> +MODULE_DEVICE_TABLE(of, adc_joystick_of_match);
> +
> +static struct platform_driver adc_joystick_driver = {
> +	.driver = {
> +		.name = "adc-joystick",
> +		.of_match_table = of_match_ptr(adc_joystick_of_match),
> +	},
> +	.probe = adc_joystick_probe,
> +};
> +module_platform_driver(adc_joystick_driver);
> +
> +MODULE_DESCRIPTION("Input driver for joysticks connected over ADC");
> +MODULE_AUTHOR("Artur Rojek <contact@artur-rojek.eu>");
> +MODULE_LICENSE("GPL");


^ permalink raw reply	[flat|nested] 13+ messages in thread

* Re: [PATCH 3/5] IIO: Ingenic JZ47xx: Add touchscreen mode.
  2020-01-11 11:46   ` Jonathan Cameron
@ 2020-01-13 14:59     ` Paul Cercueil
  2020-01-17 17:17       ` Jonathan Cameron
  2020-01-18 11:15       ` Jonathan Cameron
  0 siblings, 2 replies; 13+ messages in thread
From: Paul Cercueil @ 2020-01-13 14:59 UTC (permalink / raw)
  To: Jonathan Cameron
  Cc: Artur Rojek, Dmitry Torokhov, Rob Herring, Mark Rutland,
	Jonathan Cameron, linux-input, devicetree, linux-iio,
	linux-kernel

Hi Jonathan,


Le sam., janv. 11, 2020 at 11:46, Jonathan Cameron 
<jic23@jic23.retrosnub.co.uk> a écrit :
> On Sun,  5 Jan 2020 01:16:37 +0100
> Artur Rojek <contact@artur-rojek.eu> wrote:
> 
>>  Implement support for the touchscreen mode found in JZ47xx SoCs ADC.
> This needs more description.
> 
> Looks like it enables a kfifo and also selects the callback buffer
> stuff to run with a generic touchscreen iio-> input driver.
> 
> A few other bits inline, but basically fine.
> 
> I've never really thought about whether we support a CB buffer
> without anything on the IIO side.   That should be possible,
> but I'm not sure what odd corner cases will turn up.  I'm guessing
> there are some, or you'd not have bothered exposing it here?

I'm sorry, what do you mean by "nothing on the IIO side"?


> 
> Thanks
> 
> Jonathan
> 
> 
>> 
>>  Signed-off-by: Artur Rojek <contact@artur-rojek.eu>
>>  Tested-by: Paul Cercueil <paul@crapouillou.net>
>>  ---
>>   drivers/iio/adc/Kconfig       |   3 +
>>   drivers/iio/adc/ingenic-adc.c | 120 
>> +++++++++++++++++++++++++++++++++-
>>   2 files changed, 121 insertions(+), 2 deletions(-)
>> 
>>  diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
>>  index 5d8540b7b427..dabbf15032af 100644
>>  --- a/drivers/iio/adc/Kconfig
>>  +++ b/drivers/iio/adc/Kconfig
>>  @@ -446,6 +446,9 @@ config INA2XX_ADC
>>   config INGENIC_ADC
>>   	tristate "Ingenic JZ47xx SoCs ADC driver"
>>   	depends on MIPS || COMPILE_TEST
>>  +	select IIO_BUFFER
>>  +	select IIO_BUFFER_CB
> 
> Feels like IIO_BUFFER_CB should be selected by the driver that
> uses that functionality rather than this one.
> 
>>  +	select IIO_KFIFO_BUF
>>   	help
>>   	  Say yes here to build support for the Ingenic JZ47xx SoCs ADC 
>> unit.
>> 
>>  diff --git a/drivers/iio/adc/ingenic-adc.c 
>> b/drivers/iio/adc/ingenic-adc.c
>>  index 7a24bc1dabe1..4dbf15fdd95d 100644
>>  --- a/drivers/iio/adc/ingenic-adc.c
>>  +++ b/drivers/iio/adc/ingenic-adc.c
>>  @@ -8,7 +8,10 @@
>> 
>>   #include <dt-bindings/iio/adc/ingenic,adc.h>
>>   #include <linux/clk.h>
>>  +#include <linux/iio/buffer.h>
>>   #include <linux/iio/iio.h>
>>  +#include <linux/iio/kfifo_buf.h>
>>  +#include <linux/interrupt.h>
>>   #include <linux/io.h>
>>   #include <linux/iopoll.h>
>>   #include <linux/kernel.h>
>>  @@ -20,6 +23,8 @@
>>   #define JZ_ADC_REG_CFG			0x04
>>   #define JZ_ADC_REG_CTRL			0x08
>>   #define JZ_ADC_REG_STATUS		0x0c
>>  +#define JZ_ADC_REG_ADSAME		0x10
>>  +#define JZ_ADC_REG_ADWAIT		0x14
>>   #define JZ_ADC_REG_ADTCH		0x18
>>   #define JZ_ADC_REG_ADBDAT		0x1c
>>   #define JZ_ADC_REG_ADSDAT		0x20
>>  @@ -28,6 +33,9 @@
>>   #define JZ_ADC_REG_ENABLE_PD		BIT(7)
>>   #define JZ_ADC_REG_CFG_AUX_MD		(BIT(0) | BIT(1))
>>   #define JZ_ADC_REG_CFG_BAT_MD		BIT(4)
>>  +#define JZ_ADC_REG_CFG_PULL_UP(n)	((n) << 16)
>>  +#define JZ_ADC_REG_CFG_SAMPLE_NUM(n)	((n) << 10)
>>  +#define JZ_ADC_REG_CFG_TOUCH_OPS_MASK	(BIT(31) | GENMASK(23, 10))
>>   #define JZ_ADC_REG_ADCLK_CLKDIV_LSB	0
>>   #define JZ4725B_ADC_REG_ADCLK_CLKDIV10US_LSB	16
>>   #define JZ4770_ADC_REG_ADCLK_CLKDIV10US_LSB	8
>>  @@ -44,6 +52,14 @@
>>   #define JZ4770_ADC_BATTERY_VREF			6600
>>   #define JZ4770_ADC_BATTERY_VREF_BITS		12
>> 
>>  +#define JZ_ADC_IRQ_AUX			BIT(0)
>>  +#define JZ_ADC_IRQ_BATTERY		BIT(1)
>>  +#define JZ_ADC_IRQ_TOUCH		BIT(2)
>>  +#define JZ_ADC_IRQ_PEN_DOWN		BIT(3)
>>  +#define JZ_ADC_IRQ_PEN_UP		BIT(4)
>>  +#define JZ_ADC_IRQ_PEN_DOWN_SLEEP	BIT(5)
>>  +#define JZ_ADC_IRQ_SLEEP		BIT(7)
>>  +
>>   struct ingenic_adc;
>> 
>>   struct ingenic_adc_soc_data {
>>  @@ -411,6 +427,30 @@ static const struct iio_info ingenic_adc_info 
>> = {
>>   };
>> 
>>   static const struct iio_chan_spec ingenic_channels[] = {
>>  +	{
>>  +		.extend_name = "touchscreen_xp",
> 
> Note that adding extended names:
> 
> 1) Needs documenting as it create ABI - so something in
> Documentation/ABI/testing/sysfs-bus-iio-*
> 
> 2) Breaks any generic userspace application.
> 
> Why can't we use modified and an axis to identify this?

I'm in a good place to know that extended names are bad. The problem 
here is that Xn/Yn channels will be added later (we have a board that 
has one joystick connected to Xp/Yp, and a second joystick connected to 
Xn/Yn). I assume that it is not possible to have two channels with the 
same type and modifier?

Alternatively I believe we could also have the first two channels as 
X/Y single-ended, and then two channels as X/Y differential, and do 
some easy math in the joystick driver, but that would make it pretty 
hardware-specific.

Cheers,
-Paul

> 
>>  +		.type = IIO_POSITIONRELATIVE,
>>  +		.indexed = 1,
>>  +		.channel = INGENIC_ADC_TOUCH_XP,
>>  +		.scan_index = 0,
>>  +		.scan_type = {
>>  +			.sign = 'u',
>>  +			.realbits = 12,
>>  +			.storagebits = 16
>>  +		},
>>  +	},
>>  +	{
>>  +		.extend_name = "touchscreen_yp",
>>  +		.type = IIO_POSITIONRELATIVE,
>>  +		.indexed = 1,
>>  +		.channel = INGENIC_ADC_TOUCH_YP,
>>  +		.scan_index = 1,
>>  +		.scan_type = {
>>  +			.sign = 'u',
>>  +			.realbits = 12,
>>  +			.storagebits = 16
>>  +		},
>>  +	},
>>   	{
>>   		.extend_name = "aux",
>>   		.type = IIO_VOLTAGE,
>>  @@ -418,6 +458,7 @@ static const struct iio_chan_spec 
>> ingenic_channels[] = {
>>   				      BIT(IIO_CHAN_INFO_SCALE),
>>   		.indexed = 1,
>>   		.channel = INGENIC_ADC_AUX,
>>  +		.scan_index = -1
>>   	},
>>   	{
>>   		.extend_name = "battery",
>>  @@ -428,6 +469,7 @@ static const struct iio_chan_spec 
>> ingenic_channels[] = {
>>   						BIT(IIO_CHAN_INFO_SCALE),
>>   		.indexed = 1,
>>   		.channel = INGENIC_ADC_BATTERY,
>>  +		.scan_index = -1
>>   	},
>>   	{ /* Must always be last in the array. */
>>   		.extend_name = "aux2",
>>  @@ -436,16 +478,70 @@ static const struct iio_chan_spec 
>> ingenic_channels[] = {
>>   				      BIT(IIO_CHAN_INFO_SCALE),
>>   		.indexed = 1,
>>   		.channel = INGENIC_ADC_AUX2,
>>  +		.scan_index = -1
>>   	},
>>   };
>> 
>>  +static int ingenic_adc_buffer_enable(struct iio_dev *iio_dev)
>>  +{
>>  +	struct ingenic_adc *adc = iio_priv(iio_dev);
>>  +
>>  +	clk_enable(adc->clk);
>>  +	/* It takes significant time for the touchscreen hw to stabilize. 
>> */
>>  +	msleep(50);
>>  +	ingenic_adc_set_config(adc, JZ_ADC_REG_CFG_TOUCH_OPS_MASK,
>>  +			       JZ_ADC_REG_CFG_SAMPLE_NUM(4) |
>>  +			       JZ_ADC_REG_CFG_PULL_UP(4));
>>  +	writew(80, adc->base + JZ_ADC_REG_ADWAIT);
>>  +	writew(2, adc->base + JZ_ADC_REG_ADSAME);
>>  +	writeb((u8)~JZ_ADC_IRQ_TOUCH, adc->base + JZ_ADC_REG_CTRL);
>>  +	writel(0, adc->base + JZ_ADC_REG_ADTCH);
>>  +	ingenic_adc_enable(adc, 2, true);
>>  +
>>  +	return 0;
>>  +}
>>  +
>>  +static int ingenic_adc_buffer_disable(struct iio_dev *iio_dev)
>>  +{
>>  +	struct ingenic_adc *adc = iio_priv(iio_dev);
>>  +
>>  +	ingenic_adc_enable(adc, 2, false);
>>  +	writeb(0xff, adc->base + JZ_ADC_REG_CTRL);
>>  +	writeb(0xff, adc->base + JZ_ADC_REG_STATUS);
>>  +	ingenic_adc_set_config(adc, JZ_ADC_REG_CFG_TOUCH_OPS_MASK, 0);
>>  +	writew(0, adc->base + JZ_ADC_REG_ADSAME);
>>  +	writew(0, adc->base + JZ_ADC_REG_ADWAIT);
>>  +	clk_disable(adc->clk);
>>  +
>>  +	return 0;
>>  +}
>>  +
>>  +static const struct iio_buffer_setup_ops ingenic_buffer_setup_ops 
>> = {
>>  +	.postenable = &ingenic_adc_buffer_enable,
>>  +	.predisable = &ingenic_adc_buffer_disable
>>  +};
>>  +
>>  +static irqreturn_t ingenic_adc_irq(int irq, void *data)
>>  +{
>>  +	struct iio_dev *iio_dev = data;
>>  +	struct ingenic_adc *adc = iio_priv(iio_dev);
>>  +	u32 tdat;
>>  +
>>  +	tdat = readl(adc->base + JZ_ADC_REG_ADTCH);
>>  +	iio_push_to_buffers(iio_dev, &tdat);
>>  +	writeb(JZ_ADC_IRQ_TOUCH, adc->base + JZ_ADC_REG_STATUS);
>>  +
>>  +	return IRQ_HANDLED;
>>  +}
>>  +
>>   static int ingenic_adc_probe(struct platform_device *pdev)
>>   {
>>   	struct device *dev = &pdev->dev;
>>   	struct iio_dev *iio_dev;
>>   	struct ingenic_adc *adc;
>>   	const struct ingenic_adc_soc_data *soc_data;
>>  -	int ret;
>>  +	struct iio_buffer *buffer;
>>  +	int irq, ret;
>> 
>>   	soc_data = device_get_match_data(dev);
>>   	if (!soc_data)
>>  @@ -460,6 +556,18 @@ static int ingenic_adc_probe(struct 
>> platform_device *pdev)
>>   	mutex_init(&adc->aux_lock);
>>   	adc->soc_data = soc_data;
>> 
>>  +	irq = platform_get_irq(pdev, 0);
>>  +	if (irq < 0) {
>>  +		dev_err(dev, "Failed to get irq: %d\n", irq);
>>  +		return irq;
>>  +	}
>>  +	ret = devm_request_irq(dev, irq, ingenic_adc_irq, 0,
>>  +			       dev_name(dev), iio_dev);
>>  +	if (ret < 0) {
>>  +		dev_err(dev, "Failed to request irq: %d\n", ret);
>>  +		return ret;
>>  +	}
>>  +
>>   	adc->base = devm_platform_ioremap_resource(pdev, 0);
>>   	if (IS_ERR(adc->base))
>>   		return PTR_ERR(adc->base);
>>  @@ -499,7 +607,8 @@ static int ingenic_adc_probe(struct 
>> platform_device *pdev)
>> 
>>   	iio_dev->dev.parent = dev;
>>   	iio_dev->name = "jz-adc";
>>  -	iio_dev->modes = INDIO_DIRECT_MODE;
>>  +	iio_dev->modes = INDIO_DIRECT_MODE | INDIO_BUFFER_SOFTWARE;
>>  +	iio_dev->setup_ops = &ingenic_buffer_setup_ops;
>>   	iio_dev->channels = ingenic_channels;
>>   	iio_dev->num_channels = ARRAY_SIZE(ingenic_channels);
>>   	/* Remove AUX2 from the list of supported channels. */
>>  @@ -507,6 +616,13 @@ static int ingenic_adc_probe(struct 
>> platform_device *pdev)
>>   		iio_dev->num_channels -= 1;
>>   	iio_dev->info = &ingenic_adc_info;
>> 
>>  +	buffer = devm_iio_kfifo_allocate(dev);
>>  +	if (!buffer) {
>>  +		dev_err(dev, "Unable to add IIO buffer\n");
>>  +		return -ENOMEM;
>>  +	}
>>  +	iio_device_attach_buffer(iio_dev, buffer);
>>  +
>>   	ret = devm_iio_device_register(dev, iio_dev);
>>   	if (ret)
>>   		dev_err(dev, "Unable to register IIO device\n");
> 



^ permalink raw reply	[flat|nested] 13+ messages in thread

* Re: [PATCH 3/5] IIO: Ingenic JZ47xx: Add touchscreen mode.
  2020-01-13 14:59     ` Paul Cercueil
@ 2020-01-17 17:17       ` Jonathan Cameron
  2020-01-18 11:15       ` Jonathan Cameron
  1 sibling, 0 replies; 13+ messages in thread
From: Jonathan Cameron @ 2020-01-17 17:17 UTC (permalink / raw)
  To: Paul Cercueil
  Cc: Jonathan Cameron, Artur Rojek, Dmitry Torokhov, Rob Herring,
	Mark Rutland, linux-input, devicetree, linux-iio, linux-kernel

On Mon, 13 Jan 2020 11:59:00 -0300
Paul Cercueil <paul@crapouillou.net> wrote:

> Hi Jonathan,
> 
> 
> Le sam., janv. 11, 2020 at 11:46, Jonathan Cameron 
> <jic23@jic23.retrosnub.co.uk> a écrit :
> > On Sun,  5 Jan 2020 01:16:37 +0100
> > Artur Rojek <contact@artur-rojek.eu> wrote:
> >   
> >>  Implement support for the touchscreen mode found in JZ47xx SoCs ADC.  
> > This needs more description.
> > 
> > Looks like it enables a kfifo and also selects the callback buffer
> > stuff to run with a generic touchscreen iio-> input driver.
> > 
> > A few other bits inline, but basically fine.
> > 
> > I've never really thought about whether we support a CB buffer
> > without anything on the IIO side.   That should be possible,
> > but I'm not sure what odd corner cases will turn up.  I'm guessing
> > there are some, or you'd not have bothered exposing it here?  
> 
> I'm sorry, what do you mean by "nothing on the IIO side"?

If these channels are only used for touchscreen, why expose them
as an IIO Kfifo?

That's the IIO userspace interface, but you really just want them
to be available via the cb buffer (which isn't actually a buffer,
it calls the function without any buffering).

J
> 
> 
> > 
> > Thanks
> > 
> > Jonathan
> > 
> >   
> >> 
> >>  Signed-off-by: Artur Rojek <contact@artur-rojek.eu>
> >>  Tested-by: Paul Cercueil <paul@crapouillou.net>
> >>  ---
> >>   drivers/iio/adc/Kconfig       |   3 +
> >>   drivers/iio/adc/ingenic-adc.c | 120 
> >> +++++++++++++++++++++++++++++++++-
> >>   2 files changed, 121 insertions(+), 2 deletions(-)
> >> 
> >>  diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
> >>  index 5d8540b7b427..dabbf15032af 100644
> >>  --- a/drivers/iio/adc/Kconfig
> >>  +++ b/drivers/iio/adc/Kconfig
> >>  @@ -446,6 +446,9 @@ config INA2XX_ADC
> >>   config INGENIC_ADC
> >>   	tristate "Ingenic JZ47xx SoCs ADC driver"
> >>   	depends on MIPS || COMPILE_TEST
> >>  +	select IIO_BUFFER
> >>  +	select IIO_BUFFER_CB  
> > 
> > Feels like IIO_BUFFER_CB should be selected by the driver that
> > uses that functionality rather than this one.
> >   
> >>  +	select IIO_KFIFO_BUF
> >>   	help
> >>   	  Say yes here to build support for the Ingenic JZ47xx SoCs ADC 
> >> unit.
> >> 
> >>  diff --git a/drivers/iio/adc/ingenic-adc.c 
> >> b/drivers/iio/adc/ingenic-adc.c
> >>  index 7a24bc1dabe1..4dbf15fdd95d 100644
> >>  --- a/drivers/iio/adc/ingenic-adc.c
> >>  +++ b/drivers/iio/adc/ingenic-adc.c
> >>  @@ -8,7 +8,10 @@
> >> 
> >>   #include <dt-bindings/iio/adc/ingenic,adc.h>
> >>   #include <linux/clk.h>
> >>  +#include <linux/iio/buffer.h>
> >>   #include <linux/iio/iio.h>
> >>  +#include <linux/iio/kfifo_buf.h>
> >>  +#include <linux/interrupt.h>
> >>   #include <linux/io.h>
> >>   #include <linux/iopoll.h>
> >>   #include <linux/kernel.h>
> >>  @@ -20,6 +23,8 @@
> >>   #define JZ_ADC_REG_CFG			0x04
> >>   #define JZ_ADC_REG_CTRL			0x08
> >>   #define JZ_ADC_REG_STATUS		0x0c
> >>  +#define JZ_ADC_REG_ADSAME		0x10
> >>  +#define JZ_ADC_REG_ADWAIT		0x14
> >>   #define JZ_ADC_REG_ADTCH		0x18
> >>   #define JZ_ADC_REG_ADBDAT		0x1c
> >>   #define JZ_ADC_REG_ADSDAT		0x20
> >>  @@ -28,6 +33,9 @@
> >>   #define JZ_ADC_REG_ENABLE_PD		BIT(7)
> >>   #define JZ_ADC_REG_CFG_AUX_MD		(BIT(0) | BIT(1))
> >>   #define JZ_ADC_REG_CFG_BAT_MD		BIT(4)
> >>  +#define JZ_ADC_REG_CFG_PULL_UP(n)	((n) << 16)
> >>  +#define JZ_ADC_REG_CFG_SAMPLE_NUM(n)	((n) << 10)
> >>  +#define JZ_ADC_REG_CFG_TOUCH_OPS_MASK	(BIT(31) | GENMASK(23, 10))
> >>   #define JZ_ADC_REG_ADCLK_CLKDIV_LSB	0
> >>   #define JZ4725B_ADC_REG_ADCLK_CLKDIV10US_LSB	16
> >>   #define JZ4770_ADC_REG_ADCLK_CLKDIV10US_LSB	8
> >>  @@ -44,6 +52,14 @@
> >>   #define JZ4770_ADC_BATTERY_VREF			6600
> >>   #define JZ4770_ADC_BATTERY_VREF_BITS		12
> >> 
> >>  +#define JZ_ADC_IRQ_AUX			BIT(0)
> >>  +#define JZ_ADC_IRQ_BATTERY		BIT(1)
> >>  +#define JZ_ADC_IRQ_TOUCH		BIT(2)
> >>  +#define JZ_ADC_IRQ_PEN_DOWN		BIT(3)
> >>  +#define JZ_ADC_IRQ_PEN_UP		BIT(4)
> >>  +#define JZ_ADC_IRQ_PEN_DOWN_SLEEP	BIT(5)
> >>  +#define JZ_ADC_IRQ_SLEEP		BIT(7)
> >>  +
> >>   struct ingenic_adc;
> >> 
> >>   struct ingenic_adc_soc_data {
> >>  @@ -411,6 +427,30 @@ static const struct iio_info ingenic_adc_info 
> >> = {
> >>   };
> >> 
> >>   static const struct iio_chan_spec ingenic_channels[] = {
> >>  +	{
> >>  +		.extend_name = "touchscreen_xp",  
> > 
> > Note that adding extended names:
> > 
> > 1) Needs documenting as it create ABI - so something in
> > Documentation/ABI/testing/sysfs-bus-iio-*
> > 
> > 2) Breaks any generic userspace application.
> > 
> > Why can't we use modified and an axis to identify this?  
> 
> I'm in a good place to know that extended names are bad. The problem 
> here is that Xn/Yn channels will be added later (we have a board that 
> has one joystick connected to Xp/Yp, and a second joystick connected to 
> Xn/Yn). I assume that it is not possible to have two channels with the 
> same type and modifier?
> 
> Alternatively I believe we could also have the first two channels as 
> X/Y single-ended, and then two channels as X/Y differential, and do 
> some easy math in the joystick driver, but that would make it pretty 
> hardware-specific.
> 
> Cheers,
> -Paul
> 
> >   
> >>  +		.type = IIO_POSITIONRELATIVE,
> >>  +		.indexed = 1,
> >>  +		.channel = INGENIC_ADC_TOUCH_XP,
> >>  +		.scan_index = 0,
> >>  +		.scan_type = {
> >>  +			.sign = 'u',
> >>  +			.realbits = 12,
> >>  +			.storagebits = 16
> >>  +		},
> >>  +	},
> >>  +	{
> >>  +		.extend_name = "touchscreen_yp",
> >>  +		.type = IIO_POSITIONRELATIVE,
> >>  +		.indexed = 1,
> >>  +		.channel = INGENIC_ADC_TOUCH_YP,
> >>  +		.scan_index = 1,
> >>  +		.scan_type = {
> >>  +			.sign = 'u',
> >>  +			.realbits = 12,
> >>  +			.storagebits = 16
> >>  +		},
> >>  +	},
> >>   	{
> >>   		.extend_name = "aux",
> >>   		.type = IIO_VOLTAGE,
> >>  @@ -418,6 +458,7 @@ static const struct iio_chan_spec 
> >> ingenic_channels[] = {
> >>   				      BIT(IIO_CHAN_INFO_SCALE),
> >>   		.indexed = 1,
> >>   		.channel = INGENIC_ADC_AUX,
> >>  +		.scan_index = -1
> >>   	},
> >>   	{
> >>   		.extend_name = "battery",
> >>  @@ -428,6 +469,7 @@ static const struct iio_chan_spec 
> >> ingenic_channels[] = {
> >>   						BIT(IIO_CHAN_INFO_SCALE),
> >>   		.indexed = 1,
> >>   		.channel = INGENIC_ADC_BATTERY,
> >>  +		.scan_index = -1
> >>   	},
> >>   	{ /* Must always be last in the array. */
> >>   		.extend_name = "aux2",
> >>  @@ -436,16 +478,70 @@ static const struct iio_chan_spec 
> >> ingenic_channels[] = {
> >>   				      BIT(IIO_CHAN_INFO_SCALE),
> >>   		.indexed = 1,
> >>   		.channel = INGENIC_ADC_AUX2,
> >>  +		.scan_index = -1
> >>   	},
> >>   };
> >> 
> >>  +static int ingenic_adc_buffer_enable(struct iio_dev *iio_dev)
> >>  +{
> >>  +	struct ingenic_adc *adc = iio_priv(iio_dev);
> >>  +
> >>  +	clk_enable(adc->clk);
> >>  +	/* It takes significant time for the touchscreen hw to stabilize. 
> >> */
> >>  +	msleep(50);
> >>  +	ingenic_adc_set_config(adc, JZ_ADC_REG_CFG_TOUCH_OPS_MASK,
> >>  +			       JZ_ADC_REG_CFG_SAMPLE_NUM(4) |
> >>  +			       JZ_ADC_REG_CFG_PULL_UP(4));
> >>  +	writew(80, adc->base + JZ_ADC_REG_ADWAIT);
> >>  +	writew(2, adc->base + JZ_ADC_REG_ADSAME);
> >>  +	writeb((u8)~JZ_ADC_IRQ_TOUCH, adc->base + JZ_ADC_REG_CTRL);
> >>  +	writel(0, adc->base + JZ_ADC_REG_ADTCH);
> >>  +	ingenic_adc_enable(adc, 2, true);
> >>  +
> >>  +	return 0;
> >>  +}
> >>  +
> >>  +static int ingenic_adc_buffer_disable(struct iio_dev *iio_dev)
> >>  +{
> >>  +	struct ingenic_adc *adc = iio_priv(iio_dev);
> >>  +
> >>  +	ingenic_adc_enable(adc, 2, false);
> >>  +	writeb(0xff, adc->base + JZ_ADC_REG_CTRL);
> >>  +	writeb(0xff, adc->base + JZ_ADC_REG_STATUS);
> >>  +	ingenic_adc_set_config(adc, JZ_ADC_REG_CFG_TOUCH_OPS_MASK, 0);
> >>  +	writew(0, adc->base + JZ_ADC_REG_ADSAME);
> >>  +	writew(0, adc->base + JZ_ADC_REG_ADWAIT);
> >>  +	clk_disable(adc->clk);
> >>  +
> >>  +	return 0;
> >>  +}
> >>  +
> >>  +static const struct iio_buffer_setup_ops ingenic_buffer_setup_ops 
> >> = {
> >>  +	.postenable = &ingenic_adc_buffer_enable,
> >>  +	.predisable = &ingenic_adc_buffer_disable
> >>  +};
> >>  +
> >>  +static irqreturn_t ingenic_adc_irq(int irq, void *data)
> >>  +{
> >>  +	struct iio_dev *iio_dev = data;
> >>  +	struct ingenic_adc *adc = iio_priv(iio_dev);
> >>  +	u32 tdat;
> >>  +
> >>  +	tdat = readl(adc->base + JZ_ADC_REG_ADTCH);
> >>  +	iio_push_to_buffers(iio_dev, &tdat);
> >>  +	writeb(JZ_ADC_IRQ_TOUCH, adc->base + JZ_ADC_REG_STATUS);
> >>  +
> >>  +	return IRQ_HANDLED;
> >>  +}
> >>  +
> >>   static int ingenic_adc_probe(struct platform_device *pdev)
> >>   {
> >>   	struct device *dev = &pdev->dev;
> >>   	struct iio_dev *iio_dev;
> >>   	struct ingenic_adc *adc;
> >>   	const struct ingenic_adc_soc_data *soc_data;
> >>  -	int ret;
> >>  +	struct iio_buffer *buffer;
> >>  +	int irq, ret;
> >> 
> >>   	soc_data = device_get_match_data(dev);
> >>   	if (!soc_data)
> >>  @@ -460,6 +556,18 @@ static int ingenic_adc_probe(struct 
> >> platform_device *pdev)
> >>   	mutex_init(&adc->aux_lock);
> >>   	adc->soc_data = soc_data;
> >> 
> >>  +	irq = platform_get_irq(pdev, 0);
> >>  +	if (irq < 0) {
> >>  +		dev_err(dev, "Failed to get irq: %d\n", irq);
> >>  +		return irq;
> >>  +	}
> >>  +	ret = devm_request_irq(dev, irq, ingenic_adc_irq, 0,
> >>  +			       dev_name(dev), iio_dev);
> >>  +	if (ret < 0) {
> >>  +		dev_err(dev, "Failed to request irq: %d\n", ret);
> >>  +		return ret;
> >>  +	}
> >>  +
> >>   	adc->base = devm_platform_ioremap_resource(pdev, 0);
> >>   	if (IS_ERR(adc->base))
> >>   		return PTR_ERR(adc->base);
> >>  @@ -499,7 +607,8 @@ static int ingenic_adc_probe(struct 
> >> platform_device *pdev)
> >> 
> >>   	iio_dev->dev.parent = dev;
> >>   	iio_dev->name = "jz-adc";
> >>  -	iio_dev->modes = INDIO_DIRECT_MODE;
> >>  +	iio_dev->modes = INDIO_DIRECT_MODE | INDIO_BUFFER_SOFTWARE;
> >>  +	iio_dev->setup_ops = &ingenic_buffer_setup_ops;
> >>   	iio_dev->channels = ingenic_channels;
> >>   	iio_dev->num_channels = ARRAY_SIZE(ingenic_channels);
> >>   	/* Remove AUX2 from the list of supported channels. */
> >>  @@ -507,6 +616,13 @@ static int ingenic_adc_probe(struct 
> >> platform_device *pdev)
> >>   		iio_dev->num_channels -= 1;
> >>   	iio_dev->info = &ingenic_adc_info;
> >> 
> >>  +	buffer = devm_iio_kfifo_allocate(dev);
> >>  +	if (!buffer) {
> >>  +		dev_err(dev, "Unable to add IIO buffer\n");
> >>  +		return -ENOMEM;
> >>  +	}
> >>  +	iio_device_attach_buffer(iio_dev, buffer);
> >>  +
> >>   	ret = devm_iio_device_register(dev, iio_dev);
> >>   	if (ret)
> >>   		dev_err(dev, "Unable to register IIO device\n");  
> >   
> 
> 



^ permalink raw reply	[flat|nested] 13+ messages in thread

* Re: [PATCH 3/5] IIO: Ingenic JZ47xx: Add touchscreen mode.
  2020-01-13 14:59     ` Paul Cercueil
  2020-01-17 17:17       ` Jonathan Cameron
@ 2020-01-18 11:15       ` Jonathan Cameron
  1 sibling, 0 replies; 13+ messages in thread
From: Jonathan Cameron @ 2020-01-18 11:15 UTC (permalink / raw)
  To: Paul Cercueil
  Cc: Artur Rojek, Dmitry Torokhov, Rob Herring, Mark Rutland,
	Jonathan Cameron, linux-input, devicetree, linux-iio,
	linux-kernel

On Mon, 13 Jan 2020 11:59:00 -0300
Paul Cercueil <paul@crapouillou.net> wrote:

> Hi Jonathan,
> 
> 
> Le sam., janv. 11, 2020 at 11:46, Jonathan Cameron 
> <jic23@jic23.retrosnub.co.uk> a écrit :
> > On Sun,  5 Jan 2020 01:16:37 +0100
> > Artur Rojek <contact@artur-rojek.eu> wrote:
> >   
> >>  Implement support for the touchscreen mode found in JZ47xx SoCs ADC.  
> > This needs more description.
> > 
> > Looks like it enables a kfifo and also selects the callback buffer
> > stuff to run with a generic touchscreen iio-> input driver.
> > 
> > A few other bits inline, but basically fine.
> > 
> > I've never really thought about whether we support a CB buffer
> > without anything on the IIO side.   That should be possible,
> > but I'm not sure what odd corner cases will turn up.  I'm guessing
> > there are some, or you'd not have bothered exposing it here?  
> 
> I'm sorry, what do you mean by "nothing on the IIO side"?

Hmm. I thought I replied to this from work yesterday, but
not seeing anything on my personal email.  Oh well.

You currently support an IIO kfifo buffer.  That isn't
actually used in the path to the touchscreen assuming you
are using a callback buffer.   So in theory it might be
nice to drop the IIO side.  However, I'm not sure the
core actually supports that at the moment, or what needs
to change to make it possible.

Jonathan

> 
> 
> > 
> > Thanks
> > 
> > Jonathan
> > 
> >   
> >> 
> >>  Signed-off-by: Artur Rojek <contact@artur-rojek.eu>
> >>  Tested-by: Paul Cercueil <paul@crapouillou.net>
> >>  ---
> >>   drivers/iio/adc/Kconfig       |   3 +
> >>   drivers/iio/adc/ingenic-adc.c | 120 
> >> +++++++++++++++++++++++++++++++++-
> >>   2 files changed, 121 insertions(+), 2 deletions(-)
> >> 
> >>  diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
> >>  index 5d8540b7b427..dabbf15032af 100644
> >>  --- a/drivers/iio/adc/Kconfig
> >>  +++ b/drivers/iio/adc/Kconfig
> >>  @@ -446,6 +446,9 @@ config INA2XX_ADC
> >>   config INGENIC_ADC
> >>   	tristate "Ingenic JZ47xx SoCs ADC driver"
> >>   	depends on MIPS || COMPILE_TEST
> >>  +	select IIO_BUFFER
> >>  +	select IIO_BUFFER_CB  
> > 
> > Feels like IIO_BUFFER_CB should be selected by the driver that
> > uses that functionality rather than this one.
> >   
> >>  +	select IIO_KFIFO_BUF
> >>   	help
> >>   	  Say yes here to build support for the Ingenic JZ47xx SoCs ADC 
> >> unit.
> >> 
> >>  diff --git a/drivers/iio/adc/ingenic-adc.c 
> >> b/drivers/iio/adc/ingenic-adc.c
> >>  index 7a24bc1dabe1..4dbf15fdd95d 100644
> >>  --- a/drivers/iio/adc/ingenic-adc.c
> >>  +++ b/drivers/iio/adc/ingenic-adc.c
> >>  @@ -8,7 +8,10 @@
> >> 
> >>   #include <dt-bindings/iio/adc/ingenic,adc.h>
> >>   #include <linux/clk.h>
> >>  +#include <linux/iio/buffer.h>
> >>   #include <linux/iio/iio.h>
> >>  +#include <linux/iio/kfifo_buf.h>
> >>  +#include <linux/interrupt.h>
> >>   #include <linux/io.h>
> >>   #include <linux/iopoll.h>
> >>   #include <linux/kernel.h>
> >>  @@ -20,6 +23,8 @@
> >>   #define JZ_ADC_REG_CFG			0x04
> >>   #define JZ_ADC_REG_CTRL			0x08
> >>   #define JZ_ADC_REG_STATUS		0x0c
> >>  +#define JZ_ADC_REG_ADSAME		0x10
> >>  +#define JZ_ADC_REG_ADWAIT		0x14
> >>   #define JZ_ADC_REG_ADTCH		0x18
> >>   #define JZ_ADC_REG_ADBDAT		0x1c
> >>   #define JZ_ADC_REG_ADSDAT		0x20
> >>  @@ -28,6 +33,9 @@
> >>   #define JZ_ADC_REG_ENABLE_PD		BIT(7)
> >>   #define JZ_ADC_REG_CFG_AUX_MD		(BIT(0) | BIT(1))
> >>   #define JZ_ADC_REG_CFG_BAT_MD		BIT(4)
> >>  +#define JZ_ADC_REG_CFG_PULL_UP(n)	((n) << 16)
> >>  +#define JZ_ADC_REG_CFG_SAMPLE_NUM(n)	((n) << 10)
> >>  +#define JZ_ADC_REG_CFG_TOUCH_OPS_MASK	(BIT(31) | GENMASK(23, 10))
> >>   #define JZ_ADC_REG_ADCLK_CLKDIV_LSB	0
> >>   #define JZ4725B_ADC_REG_ADCLK_CLKDIV10US_LSB	16
> >>   #define JZ4770_ADC_REG_ADCLK_CLKDIV10US_LSB	8
> >>  @@ -44,6 +52,14 @@
> >>   #define JZ4770_ADC_BATTERY_VREF			6600
> >>   #define JZ4770_ADC_BATTERY_VREF_BITS		12
> >> 
> >>  +#define JZ_ADC_IRQ_AUX			BIT(0)
> >>  +#define JZ_ADC_IRQ_BATTERY		BIT(1)
> >>  +#define JZ_ADC_IRQ_TOUCH		BIT(2)
> >>  +#define JZ_ADC_IRQ_PEN_DOWN		BIT(3)
> >>  +#define JZ_ADC_IRQ_PEN_UP		BIT(4)
> >>  +#define JZ_ADC_IRQ_PEN_DOWN_SLEEP	BIT(5)
> >>  +#define JZ_ADC_IRQ_SLEEP		BIT(7)
> >>  +
> >>   struct ingenic_adc;
> >> 
> >>   struct ingenic_adc_soc_data {
> >>  @@ -411,6 +427,30 @@ static const struct iio_info ingenic_adc_info 
> >> = {
> >>   };
> >> 
> >>   static const struct iio_chan_spec ingenic_channels[] = {
> >>  +	{
> >>  +		.extend_name = "touchscreen_xp",  
> > 
> > Note that adding extended names:
> > 
> > 1) Needs documenting as it create ABI - so something in
> > Documentation/ABI/testing/sysfs-bus-iio-*
> > 
> > 2) Breaks any generic userspace application.
> > 
> > Why can't we use modified and an axis to identify this?  
> 
> I'm in a good place to know that extended names are bad. The problem 
> here is that Xn/Yn channels will be added later (we have a board that 
> has one joystick connected to Xp/Yp, and a second joystick connected to 
> Xn/Yn). I assume that it is not possible to have two channels with the 
> same type and modifier?
> 
> Alternatively I believe we could also have the first two channels as 
> X/Y single-ended, and then two channels as X/Y differential, and do 
> some easy math in the joystick driver, but that would make it pretty 
> hardware-specific.
> 
> Cheers,
> -Paul
> 
> >   
> >>  +		.type = IIO_POSITIONRELATIVE,
> >>  +		.indexed = 1,
> >>  +		.channel = INGENIC_ADC_TOUCH_XP,
> >>  +		.scan_index = 0,
> >>  +		.scan_type = {
> >>  +			.sign = 'u',
> >>  +			.realbits = 12,
> >>  +			.storagebits = 16
> >>  +		},
> >>  +	},
> >>  +	{
> >>  +		.extend_name = "touchscreen_yp",
> >>  +		.type = IIO_POSITIONRELATIVE,
> >>  +		.indexed = 1,
> >>  +		.channel = INGENIC_ADC_TOUCH_YP,
> >>  +		.scan_index = 1,
> >>  +		.scan_type = {
> >>  +			.sign = 'u',
> >>  +			.realbits = 12,
> >>  +			.storagebits = 16
> >>  +		},
> >>  +	},
> >>   	{
> >>   		.extend_name = "aux",
> >>   		.type = IIO_VOLTAGE,
> >>  @@ -418,6 +458,7 @@ static const struct iio_chan_spec 
> >> ingenic_channels[] = {
> >>   				      BIT(IIO_CHAN_INFO_SCALE),
> >>   		.indexed = 1,
> >>   		.channel = INGENIC_ADC_AUX,
> >>  +		.scan_index = -1
> >>   	},
> >>   	{
> >>   		.extend_name = "battery",
> >>  @@ -428,6 +469,7 @@ static const struct iio_chan_spec 
> >> ingenic_channels[] = {
> >>   						BIT(IIO_CHAN_INFO_SCALE),
> >>   		.indexed = 1,
> >>   		.channel = INGENIC_ADC_BATTERY,
> >>  +		.scan_index = -1
> >>   	},
> >>   	{ /* Must always be last in the array. */
> >>   		.extend_name = "aux2",
> >>  @@ -436,16 +478,70 @@ static const struct iio_chan_spec 
> >> ingenic_channels[] = {
> >>   				      BIT(IIO_CHAN_INFO_SCALE),
> >>   		.indexed = 1,
> >>   		.channel = INGENIC_ADC_AUX2,
> >>  +		.scan_index = -1
> >>   	},
> >>   };
> >> 
> >>  +static int ingenic_adc_buffer_enable(struct iio_dev *iio_dev)
> >>  +{
> >>  +	struct ingenic_adc *adc = iio_priv(iio_dev);
> >>  +
> >>  +	clk_enable(adc->clk);
> >>  +	/* It takes significant time for the touchscreen hw to stabilize. 
> >> */
> >>  +	msleep(50);
> >>  +	ingenic_adc_set_config(adc, JZ_ADC_REG_CFG_TOUCH_OPS_MASK,
> >>  +			       JZ_ADC_REG_CFG_SAMPLE_NUM(4) |
> >>  +			       JZ_ADC_REG_CFG_PULL_UP(4));
> >>  +	writew(80, adc->base + JZ_ADC_REG_ADWAIT);
> >>  +	writew(2, adc->base + JZ_ADC_REG_ADSAME);
> >>  +	writeb((u8)~JZ_ADC_IRQ_TOUCH, adc->base + JZ_ADC_REG_CTRL);
> >>  +	writel(0, adc->base + JZ_ADC_REG_ADTCH);
> >>  +	ingenic_adc_enable(adc, 2, true);
> >>  +
> >>  +	return 0;
> >>  +}
> >>  +
> >>  +static int ingenic_adc_buffer_disable(struct iio_dev *iio_dev)
> >>  +{
> >>  +	struct ingenic_adc *adc = iio_priv(iio_dev);
> >>  +
> >>  +	ingenic_adc_enable(adc, 2, false);
> >>  +	writeb(0xff, adc->base + JZ_ADC_REG_CTRL);
> >>  +	writeb(0xff, adc->base + JZ_ADC_REG_STATUS);
> >>  +	ingenic_adc_set_config(adc, JZ_ADC_REG_CFG_TOUCH_OPS_MASK, 0);
> >>  +	writew(0, adc->base + JZ_ADC_REG_ADSAME);
> >>  +	writew(0, adc->base + JZ_ADC_REG_ADWAIT);
> >>  +	clk_disable(adc->clk);
> >>  +
> >>  +	return 0;
> >>  +}
> >>  +
> >>  +static const struct iio_buffer_setup_ops ingenic_buffer_setup_ops 
> >> = {
> >>  +	.postenable = &ingenic_adc_buffer_enable,
> >>  +	.predisable = &ingenic_adc_buffer_disable
> >>  +};
> >>  +
> >>  +static irqreturn_t ingenic_adc_irq(int irq, void *data)
> >>  +{
> >>  +	struct iio_dev *iio_dev = data;
> >>  +	struct ingenic_adc *adc = iio_priv(iio_dev);
> >>  +	u32 tdat;
> >>  +
> >>  +	tdat = readl(adc->base + JZ_ADC_REG_ADTCH);
> >>  +	iio_push_to_buffers(iio_dev, &tdat);
> >>  +	writeb(JZ_ADC_IRQ_TOUCH, adc->base + JZ_ADC_REG_STATUS);
> >>  +
> >>  +	return IRQ_HANDLED;
> >>  +}
> >>  +
> >>   static int ingenic_adc_probe(struct platform_device *pdev)
> >>   {
> >>   	struct device *dev = &pdev->dev;
> >>   	struct iio_dev *iio_dev;
> >>   	struct ingenic_adc *adc;
> >>   	const struct ingenic_adc_soc_data *soc_data;
> >>  -	int ret;
> >>  +	struct iio_buffer *buffer;
> >>  +	int irq, ret;
> >> 
> >>   	soc_data = device_get_match_data(dev);
> >>   	if (!soc_data)
> >>  @@ -460,6 +556,18 @@ static int ingenic_adc_probe(struct 
> >> platform_device *pdev)
> >>   	mutex_init(&adc->aux_lock);
> >>   	adc->soc_data = soc_data;
> >> 
> >>  +	irq = platform_get_irq(pdev, 0);
> >>  +	if (irq < 0) {
> >>  +		dev_err(dev, "Failed to get irq: %d\n", irq);
> >>  +		return irq;
> >>  +	}
> >>  +	ret = devm_request_irq(dev, irq, ingenic_adc_irq, 0,
> >>  +			       dev_name(dev), iio_dev);
> >>  +	if (ret < 0) {
> >>  +		dev_err(dev, "Failed to request irq: %d\n", ret);
> >>  +		return ret;
> >>  +	}
> >>  +
> >>   	adc->base = devm_platform_ioremap_resource(pdev, 0);
> >>   	if (IS_ERR(adc->base))
> >>   		return PTR_ERR(adc->base);
> >>  @@ -499,7 +607,8 @@ static int ingenic_adc_probe(struct 
> >> platform_device *pdev)
> >> 
> >>   	iio_dev->dev.parent = dev;
> >>   	iio_dev->name = "jz-adc";
> >>  -	iio_dev->modes = INDIO_DIRECT_MODE;
> >>  +	iio_dev->modes = INDIO_DIRECT_MODE | INDIO_BUFFER_SOFTWARE;
> >>  +	iio_dev->setup_ops = &ingenic_buffer_setup_ops;
> >>   	iio_dev->channels = ingenic_channels;
> >>   	iio_dev->num_channels = ARRAY_SIZE(ingenic_channels);
> >>   	/* Remove AUX2 from the list of supported channels. */
> >>  @@ -507,6 +616,13 @@ static int ingenic_adc_probe(struct 
> >> platform_device *pdev)
> >>   		iio_dev->num_channels -= 1;
> >>   	iio_dev->info = &ingenic_adc_info;
> >> 
> >>  +	buffer = devm_iio_kfifo_allocate(dev);
> >>  +	if (!buffer) {
> >>  +		dev_err(dev, "Unable to add IIO buffer\n");
> >>  +		return -ENOMEM;
> >>  +	}
> >>  +	iio_device_attach_buffer(iio_dev, buffer);
> >>  +
> >>   	ret = devm_iio_device_register(dev, iio_dev);
> >>   	if (ret)
> >>   		dev_err(dev, "Unable to register IIO device\n");  
> >   
> 
> 


^ permalink raw reply	[flat|nested] 13+ messages in thread

* Re: [PATCH 5/5] input: joystick: Add ADC attached joystick driver.
  2020-01-11 11:54   ` Jonathan Cameron
@ 2020-01-20 19:39     ` Dmitry Torokhov
  0 siblings, 0 replies; 13+ messages in thread
From: Dmitry Torokhov @ 2020-01-20 19:39 UTC (permalink / raw)
  To: Jonathan Cameron
  Cc: Artur Rojek, Rob Herring, Mark Rutland, Jonathan Cameron,
	Paul Cercueil, linux-input, devicetree, linux-iio, linux-kernel

On Sat, Jan 11, 2020 at 11:54:40AM +0000, Jonathan Cameron wrote:
> On Sun,  5 Jan 2020 01:16:39 +0100
> Artur Rojek <contact@artur-rojek.eu> wrote:
> 
> > Add a driver for joystick devices connected to ADC controllers
> > supporting the Industrial I/O subsystem.
> > 
> > Signed-off-by: Artur Rojek <contact@artur-rojek.eu>
> > Tested-by: Paul Cercueil <paul@crapouillou.net>
> 
> Looks pretty good, but I'd like to see a little more sanity checking
> on probe that the channels are in a format this driver can actually
> handle.  Given we can check channel size and consistency etc early
> it would be better to fail to probe than just report error data later.

Artur,

From my POV it looks decent so as soon as you address Jonathan requests
you can add

Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>

assuming you want it to be perged through IIO tree.

Thanks.

-- 
Dmitry

^ permalink raw reply	[flat|nested] 13+ messages in thread

end of thread, back to index

Thread overview: 13+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-01-05  0:16 [PATCH 1/5] IIO: Ingenic JZ47xx: Add xlate cb to retrieve correct channel idx Artur Rojek
2020-01-05  0:16 ` [PATCH 2/5] dt-bindings: iio/adc: Add touchscreen idx for JZ47xx SoC ADC Artur Rojek
2020-01-08 16:59   ` Rob Herring
2020-01-05  0:16 ` [PATCH 3/5] IIO: Ingenic JZ47xx: Add touchscreen mode Artur Rojek
2020-01-11 11:46   ` Jonathan Cameron
2020-01-13 14:59     ` Paul Cercueil
2020-01-17 17:17       ` Jonathan Cameron
2020-01-18 11:15       ` Jonathan Cameron
2020-01-05  0:16 ` [PATCH 4/5] dt-bindings: input: Add docs for ADC driven joystick Artur Rojek
2020-01-08 20:12   ` Rob Herring
2020-01-05  0:16 ` [PATCH 5/5] input: joystick: Add ADC attached joystick driver Artur Rojek
2020-01-11 11:54   ` Jonathan Cameron
2020-01-20 19:39     ` Dmitry Torokhov

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