Re: [PATCH v2 5/5] input: joystick: Add ADC attached joystick driver.

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Hi Jonathan, Rob,

The DT check does succeed here, as long as patch [2/5] is applied. I believe Rob's automated test does not apply all patches and that's why it fails here, as the DTS example includes a file that is added in patch 2/5.

-Paul



Le dim., févr. 2, 2020 at 14:58, Jonathan Cameron <jic23@xxxxxxxxxxxxxxxxxxxxx> a écrit :
On Sun, 26 Jan 2020 17:12:36 +0100
Artur Rojek <contact@xxxxxxxxxxxxxx> wrote:

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

 Signed-off-by: Artur Rojek <contact@xxxxxxxxxxxxxx>
 Tested-by: Paul Cercueil <paul@xxxxxxxxxxxxxxx>
 Acked-by: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>

This also looks good to me.  Just that dt patch to tidy up.

Thanks,

Jonathan

 ---

  Changes:

  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

  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 <contact@xxxxxxxxxxxxxx>
 + */
 +#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 <contact@xxxxxxxxxxxxxx>");
 +MODULE_LICENSE("GPL");







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