Provide an of_xlate callback in order to retrieve the correct channel
specifier index from the IIO channels array.
Signed-off-by: Artur Rojek <[email protected]>
Tested-by: Paul Cercueil <[email protected]>
---
Changes:
v2-v4: no change
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[] = {
--
2.25.1
Introduce support for touchscreen channels found in JZ47xx SoCs.
Signed-off-by: Artur Rojek <[email protected]>
Tested-by: Paul Cercueil <[email protected]>
Acked-by: Rob Herring <[email protected]>
---
Changes:
v2-v4: no change
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
--
2.25.1
Add documentation for the adc-joystick driver, used to provide support
for joysticks connected over ADC.
Signed-off-by: Artur Rojek <[email protected]>
Tested-by: Paul Cercueil <[email protected]>
---
Changes:
v2: - Add `reg` property to axis subnode in order to enumerate the axes,
- rename `linux,abs-code` property to `linux,code`,
- drop `linux,` prefix from the remaining properties of axis subnode
v3: no change
v4: - remove "bindings" from the unique identifier string,
- replace `|` with `>` for all description properties,
- specify the number of items for `io-channels`,
- correct the regex pattern of `axis` property,
- specify the value range of `reg` property for each axis,
- put `abs-range` properties under `allOf`
.../bindings/input/adc-joystick.yaml | 121 ++++++++++++++++++
1 file changed, 121 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..b0d2aa28d8c6
--- /dev/null
+++ b/Documentation/devicetree/bindings/input/adc-joystick.yaml
@@ -0,0 +1,121 @@
+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+# Copyright 2019-2020 Artur Rojek
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/input/adc-joystick.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: ADC attached joystick
+
+maintainers:
+ - Artur Rojek <[email protected]>
+
+description: >
+ Bindings for joystick devices connected to ADC controllers supporting
+ the Industrial I/O subsystem.
+
+properties:
+ compatible:
+ const: adc-joystick
+
+ io-channels:
+ minItems: 1
+ maxItems: 1024
+ 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.
+
+ '#address-cells':
+ const: 1
+
+ '#size-cells':
+ const: 0
+
+required:
+ - compatible
+ - io-channels
+ - '#address-cells'
+ - '#size-cells'
+
+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
+ reg property must be specified.
+
+ properties:
+ reg:
+ minimum: 0
+ maximum: 1023
+ description: Index of an io-channels list entry bound to this axis.
+
+ linux,code:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description: EV_ABS specific event code generated by the axis.
+
+ abs-range:
+ allOf:
+ - $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.
+
+ abs-fuzz:
+ $ref: /schemas/types.yaml#/definitions/uint32
+ description: >
+ Amount of noise in the input value.
+ Omitting this property indicates the axis is precise.
+
+ 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:
+ - reg
+ - linux,code
+ - 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>;
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ axis@0 {
+ reg = <0>;
+ linux,code = <ABS_X>;
+ abs-range = <3300 0>;
+ abs-fuzz = <4>;
+ abs-flat = <200>;
+ };
+ axis@1 {
+ reg = <1>;
+ linux,code = <ABS_Y>;
+ abs-range = <0 3300>;
+ abs-fuzz = <4>;
+ abs-flat = <200>;
+ };
+ };
--
2.25.1
The SADC component in JZ47xx SoCs provides support for touchscreen
operations (pen position and pen down pressure) in single-ended and
differential modes.
Of the known hardware to use this controller, GCW Zero and Anbernic RG-350
utilize the touchscreen mode by having their joystick(s) attached to the
X/Y positive/negative input pins.
GCW Zero comes with a single joystick and is sufficiently handled with the
currently implemented single-ended mode. Support for boards with two
joysticks, where one is hooked up to Xn/Yn and the other to Xp/Yp channels
will need to be provided in the future.
The touchscreen component of SADC takes a significant time to stabilize
after first receiving the clock and a delay of 50ms has been empirically
proven to be a safe value before data sampling can begin.
All the boards which probe this driver have the interrupt provided from
devicetree, with no need to handle a case where the irq was not provided.
Signed-off-by: Artur Rojek <[email protected]>
Tested-by: Paul Cercueil <[email protected]>
---
Changes:
v2: - improve description of the touchscreen mode,
- get rid of the unneeded kfifo,
- drop IIO_BUFFER_CB from Kconfig,
- remove extended names from the touchscreen channels
v3: remove unneeded `linux/iio/kfifo_buf.h` include
v4: clarify irq provider source in the patch description
drivers/iio/adc/Kconfig | 1 +
drivers/iio/adc/ingenic-adc.c | 109 +++++++++++++++++++++++++++++++++-
2 files changed, 108 insertions(+), 2 deletions(-)
diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig
index 82e33082958c..d3fd4b6e2d47 100644
--- a/drivers/iio/adc/Kconfig
+++ b/drivers/iio/adc/Kconfig
@@ -453,6 +453,7 @@ config INA2XX_ADC
config INGENIC_ADC
tristate "Ingenic JZ47xx SoCs ADC driver"
depends on MIPS || COMPILE_TEST
+ select IIO_BUFFER
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..0dafc8d5d0d8 100644
--- a/drivers/iio/adc/ingenic-adc.c
+++ b/drivers/iio/adc/ingenic-adc.c
@@ -8,7 +8,9 @@
#include <dt-bindings/iio/adc/ingenic,adc.h>
#include <linux/clk.h>
+#include <linux/iio/buffer.h>
#include <linux/iio/iio.h>
+#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/iopoll.h>
#include <linux/kernel.h>
@@ -20,6 +22,8 @@
#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 +32,9 @@
#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 +51,14 @@
#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 +426,28 @@ static const struct iio_info ingenic_adc_info = {
};
static const struct iio_chan_spec ingenic_channels[] = {
+ {
+ .type = IIO_POSITIONRELATIVE,
+ .indexed = 1,
+ .channel = INGENIC_ADC_TOUCH_XP,
+ .scan_index = 0,
+ .scan_type = {
+ .sign = 'u',
+ .realbits = 12,
+ .storagebits = 16
+ },
+ },
+ {
+ .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 +455,7 @@ 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 +466,7 @@ 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 +475,69 @@ 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;
+ int irq, ret;
soc_data = device_get_match_data(dev);
if (!soc_data)
@@ -460,6 +552,18 @@ 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 +603,8 @@ 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. */
--
2.25.1
Add a driver for joystick devices connected to ADC controllers
supporting the Industrial I/O subsystem.
Signed-off-by: Artur Rojek <[email protected]>
Tested-by: Paul Cercueil <[email protected]>
Tested-by: Heiko Stuebner <[email protected]>
Acked-by: Dmitry Torokhov <[email protected]>
---
v2: - sanity check supported channel format on probe,
- rename adc_joystick_disable to a more sensible adc_joystick_cleanup,
- enforce correct axis order by checking the `reg` property of
child nodes
v3-v4: no change
drivers/input/joystick/Kconfig | 10 ++
drivers/input/joystick/Makefile | 1 +
drivers/input/joystick/adc-joystick.c | 245 ++++++++++++++++++++++++++
3 files changed, 256 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..9cb9896da26e
--- /dev/null
+++ b/drivers/input/joystick/adc-joystick.c
@@ -0,0 +1,245 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Input driver for joysticks connected over ADC.
+ * Copyright (c) 2019-2020 Artur Rojek <[email protected]>
+ */
+#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;
+
+ 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_cleanup(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, ret, i;
+
+ 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) {
+ ret = fwnode_property_read_u32(child, "reg", &i);
+ if (ret || i >= num_axes) {
+ dev_err(dev, "reg invalid or missing");
+ goto err;
+ }
+
+ if (fwnode_property_read_u32(child, "linux,code",
+ &axes[i].code)) {
+ dev_err(dev, "linux,code invalid or missing");
+ goto err;
+ }
+
+ if (fwnode_property_read_u32_array(child, "abs-range",
+ axes[i].range, 2)) {
+ dev_err(dev, "abs-range invalid or missing");
+ goto err;
+ }
+
+ fwnode_property_read_u32(child, "abs-fuzz",
+ &axes[i].fuzz);
+ fwnode_property_read_u32(child, "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);
+ }
+
+ 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 bits, ret, i;
+
+ 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++;
+
+ bits = joy->chans[0].channel->scan_type.storagebits;
+ if (!bits || (bits >> 3) > 2) {
+ dev_err(dev, "Unsupported channel storage size");
+ return -EINVAL;
+ }
+ for (i = 1; i < joy->num_chans; ++i)
+ if (joy->chans[i].channel->scan_type.storagebits != bits) {
+ dev_err(dev, "Channels must have equal storage size");
+ return -EINVAL;
+ }
+
+ 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_cleanup, 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 <[email protected]>");
+MODULE_LICENSE("GPL");
--
2.25.1
On Sat, 7 Mar 2020 22:14:11 +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 <[email protected]>
> Tested-by: Paul Cercueil <[email protected]>
> ---
>
> Changes:
>
> v2: - Add `reg` property to axis subnode in order to enumerate the axes,
> - rename `linux,abs-code` property to `linux,code`,
> - drop `linux,` prefix from the remaining properties of axis subnode
>
> v3: no change
>
> v4: - remove "bindings" from the unique identifier string,
> - replace `|` with `>` for all description properties,
> - specify the number of items for `io-channels`,
> - correct the regex pattern of `axis` property,
> - specify the value range of `reg` property for each axis,
> - put `abs-range` properties under `allOf`
>
> .../bindings/input/adc-joystick.yaml | 121 ++++++++++++++++++
> 1 file changed, 121 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/input/adc-joystick.yaml
>
My bot found errors running 'make dt_binding_check' on your patch:
Error: Documentation/devicetree/bindings/input/adc-joystick.example.dts:22.31-32 syntax error
FATAL ERROR: Unable to parse input tree
scripts/Makefile.lib:311: recipe for target 'Documentation/devicetree/bindings/input/adc-joystick.example.dt.yaml' failed
make[1]: *** [Documentation/devicetree/bindings/input/adc-joystick.example.dt.yaml] Error 1
Makefile:1262: recipe for target 'dt_binding_check' failed
make: *** [dt_binding_check] Error 2
See https://patchwork.ozlabs.org/patch/1250951
Please check and re-submit.
Hi Rob,
On 2020-03-09 21:38, Rob Herring wrote:
> On Sat, 7 Mar 2020 22:14:11 +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 <[email protected]>
>> Tested-by: Paul Cercueil <[email protected]>
>> ---
>>
>> Changes:
>>
>> v2: - Add `reg` property to axis subnode in order to enumerate the
>> axes,
>> - rename `linux,abs-code` property to `linux,code`,
>> - drop `linux,` prefix from the remaining properties of axis
>> subnode
>>
>> v3: no change
>>
>> v4: - remove "bindings" from the unique identifier string,
>> - replace `|` with `>` for all description properties,
>> - specify the number of items for `io-channels`,
>> - correct the regex pattern of `axis` property,
>> - specify the value range of `reg` property for each axis,
>> - put `abs-range` properties under `allOf`
>>
>> .../bindings/input/adc-joystick.yaml | 121
>> ++++++++++++++++++
>> 1 file changed, 121 insertions(+)
>> create mode 100644
>> Documentation/devicetree/bindings/input/adc-joystick.yaml
>>
>
> My bot found errors running 'make dt_binding_check' on your patch:
Like with the previous versions of this patch set, the DTS example
requires that
patch [2/5] is applied first. When that is done, the DT check does
succeed here.
Regards,
Artur
>
> Error:
> Documentation/devicetree/bindings/input/adc-joystick.example.dts:22.31-32
> syntax error
> FATAL ERROR: Unable to parse input tree
> scripts/Makefile.lib:311: recipe for target
> 'Documentation/devicetree/bindings/input/adc-joystick.example.dt.yaml'
> failed
> make[1]: ***
> [Documentation/devicetree/bindings/input/adc-joystick.example.dt.yaml]
> Error 1
> Makefile:1262: recipe for target 'dt_binding_check' failed
> make: *** [dt_binding_check] Error 2
>
> See https://patchwork.ozlabs.org/patch/1250951
> Please check and re-submit.
On Mon, 09 Mar 2020 22:41:00 +0100
Artur Rojek <[email protected]> wrote:
> Hi Rob,
>
> On 2020-03-09 21:38, Rob Herring wrote:
> > On Sat, 7 Mar 2020 22:14:11 +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 <[email protected]>
> >> Tested-by: Paul Cercueil <[email protected]>
> >> ---
> >>
> >> Changes:
> >>
> >> v2: - Add `reg` property to axis subnode in order to enumerate the
> >> axes,
> >> - rename `linux,abs-code` property to `linux,code`,
> >> - drop `linux,` prefix from the remaining properties of axis
> >> subnode
> >>
> >> v3: no change
> >>
> >> v4: - remove "bindings" from the unique identifier string,
> >> - replace `|` with `>` for all description properties,
> >> - specify the number of items for `io-channels`,
> >> - correct the regex pattern of `axis` property,
> >> - specify the value range of `reg` property for each axis,
> >> - put `abs-range` properties under `allOf`
> >>
> >> .../bindings/input/adc-joystick.yaml | 121
> >> ++++++++++++++++++
> >> 1 file changed, 121 insertions(+)
> >> create mode 100644
> >> Documentation/devicetree/bindings/input/adc-joystick.yaml
> >>
> >
> > My bot found errors running 'make dt_binding_check' on your patch:
> Like with the previous versions of this patch set, the DTS example
> requires that
> patch [2/5] is applied first. When that is done, the DT check does
> succeed here.
Fair enough as far as I am concerned. There were enough comments
from Rob in the previous version though that I'd definitely like
him to take another look before I pick this series up.
Thanks,
Jonathan
>
> Regards,
> Artur
> >
> > Error:
> > Documentation/devicetree/bindings/input/adc-joystick.example.dts:22.31-32
> > syntax error
> > FATAL ERROR: Unable to parse input tree
> > scripts/Makefile.lib:311: recipe for target
> > 'Documentation/devicetree/bindings/input/adc-joystick.example.dt.yaml'
> > failed
> > make[1]: ***
> > [Documentation/devicetree/bindings/input/adc-joystick.example.dt.yaml]
> > Error 1
> > Makefile:1262: recipe for target 'dt_binding_check' failed
> > make: *** [dt_binding_check] Error 2
> >
> > See https://patchwork.ozlabs.org/patch/1250951
> > Please check and re-submit.
On Sat, Mar 7, 2020 at 2:06 PM Artur Rojek <[email protected]> wrote:
>
> Add documentation for the adc-joystick driver, used to provide support
> for joysticks connected over ADC.
>
> Signed-off-by: Artur Rojek <[email protected]>
> Tested-by: Paul Cercueil <[email protected]>
> ---
>
> Changes:
>
> v2: - Add `reg` property to axis subnode in order to enumerate the axes,
> - rename `linux,abs-code` property to `linux,code`,
> - drop `linux,` prefix from the remaining properties of axis subnode
>
> v3: no change
>
> v4: - remove "bindings" from the unique identifier string,
> - replace `|` with `>` for all description properties,
> - specify the number of items for `io-channels`,
> - correct the regex pattern of `axis` property,
> - specify the value range of `reg` property for each axis,
> - put `abs-range` properties under `allOf`
>
> .../bindings/input/adc-joystick.yaml | 121 ++++++++++++++++++
> 1 file changed, 121 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..b0d2aa28d8c6
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/input/adc-joystick.yaml
> @@ -0,0 +1,121 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +# Copyright 2019-2020 Artur Rojek
> +%YAML 1.2
> +---
> +$id: "http://devicetree.org/schemas/input/adc-joystick.yaml#"
> +$schema: "http://devicetree.org/meta-schemas/core.yaml#"
> +
> +title: ADC attached joystick
> +
> +maintainers:
> + - Artur Rojek <[email protected]>
> +
> +description: >
> + Bindings for joystick devices connected to ADC controllers supporting
> + the Industrial I/O subsystem.
> +
> +properties:
> + compatible:
> + const: adc-joystick
> +
> + io-channels:
> + minItems: 1
> + maxItems: 1024
> + 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.
> +
> + '#address-cells':
> + const: 1
> +
> + '#size-cells':
> + const: 0
> +
> +required:
> + - compatible
> + - io-channels
> + - '#address-cells'
> + - '#size-cells'
> +
> +additionalProperties: false
> +
> +patternProperties:
> + "^axis@[0-9]+$":
unit-addresses are hex, so add 'a-f' in there.
With that,
Reviewed-by: Rob Herring <[email protected]>