Re: [PATCH 2/2] Input: Add driver for a generic ADC keypad
On Sat, Mar 28, 2015 at 7:02 AM, Jonathan Cameron wrote:
> On 28/03/15 00:43, Andrew Bresticker wrote:
>> Add a polled input driver for a keypad in which the buttons are connected
>> in resistor ladders to an ADC. The IIO framework is used to claim and
>> read the ADC channels.
>>
>> Signed-off-by: Andrew Bresticker
>> +static int adc_keypad_probe(struct platform_device *pdev)
>> +{
>> + struct adc_keypad *keypad;
>> + struct input_polled_dev *poll_dev;
>> + struct input_dev *input;
>> + unsigned int i;
>> + int ret;
>> +
>> + keypad = devm_kzalloc(>dev, sizeof(*keypad), GFP_KERNEL);
>> + if (!keypad)
>> + return -ENOMEM;
>> + keypad->dev = >dev;
>> + platform_set_drvdata(pdev, keypad);
>> +
>> + keypad->iio_chans = iio_channel_get_all(>dev);
>> + if (IS_ERR(keypad->iio_chans)) {
>> + dev_err(>dev, "Failed to get IIO channels: %ld\n",
>> + PTR_ERR(keypad->iio_chans));
>> + return PTR_ERR(keypad->iio_chans);
>> + }
>> +
>> + i = 0;
>> + while (keypad->iio_chans[i].channel != NULL)
>> + i++;
>> + keypad->num_chans = i;
>> + keypad->chan_map = devm_kcalloc(>dev, keypad->num_chans,
>> + sizeof(*keypad->chan_map), GFP_KERNEL);
>> + if (!keypad->chan_map) {
>> + ret = -ENOMEM;
>> + goto put_chans;
>> + }
>> +
>> + ret = adc_keypad_of_parse(keypad);
>> + if (ret < 0)
>> + goto put_chans;
>> +
>> + poll_dev = devm_input_allocate_polled_device(>dev);
>> + if (!poll_dev) {
>> + ret = -ENOMEM;
>> + goto put_chans;
>> + }
>> + keypad->poll_dev = poll_dev;
>> +
>> + poll_dev->private = keypad;
>> + poll_dev->poll = adc_keypad_poll;
>> + poll_dev->poll_interval = keypad->poll_interval;
>> +
>> + input = poll_dev->input;
>> + input->name = pdev->name;
>> + input->phys = "adc-keys/input0";
>> +
>> + input->id.bustype = BUS_HOST;
>> + input->id.vendor = 0x0001;
>> + input->id.product = 0x0001;
>> + input->id.version = 0x0100;
> Why these particular values?
I just chose these because these are the values most other platform
input devices use, including gpio_keys and gpio_keys_polled.
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Re: [PATCH 2/2] Input: Add driver for a generic ADC keypad
On Sat, Mar 28, 2015 at 7:02 AM, Jonathan Cameron ji...@kernel.org wrote:
On 28/03/15 00:43, Andrew Bresticker wrote:
Add a polled input driver for a keypad in which the buttons are connected
in resistor ladders to an ADC. The IIO framework is used to claim and
read the ADC channels.
Signed-off-by: Andrew Bresticker abres...@chromium.org
+static int adc_keypad_probe(struct platform_device *pdev)
+{
+ struct adc_keypad *keypad;
+ struct input_polled_dev *poll_dev;
+ struct input_dev *input;
+ unsigned int i;
+ int ret;
+
+ keypad = devm_kzalloc(pdev-dev, sizeof(*keypad), GFP_KERNEL);
+ if (!keypad)
+ return -ENOMEM;
+ keypad-dev = pdev-dev;
+ platform_set_drvdata(pdev, keypad);
+
+ keypad-iio_chans = iio_channel_get_all(pdev-dev);
+ if (IS_ERR(keypad-iio_chans)) {
+ dev_err(pdev-dev, Failed to get IIO channels: %ld\n,
+ PTR_ERR(keypad-iio_chans));
+ return PTR_ERR(keypad-iio_chans);
+ }
+
+ i = 0;
+ while (keypad-iio_chans[i].channel != NULL)
+ i++;
+ keypad-num_chans = i;
+ keypad-chan_map = devm_kcalloc(pdev-dev, keypad-num_chans,
+ sizeof(*keypad-chan_map), GFP_KERNEL);
+ if (!keypad-chan_map) {
+ ret = -ENOMEM;
+ goto put_chans;
+ }
+
+ ret = adc_keypad_of_parse(keypad);
+ if (ret 0)
+ goto put_chans;
+
+ poll_dev = devm_input_allocate_polled_device(pdev-dev);
+ if (!poll_dev) {
+ ret = -ENOMEM;
+ goto put_chans;
+ }
+ keypad-poll_dev = poll_dev;
+
+ poll_dev-private = keypad;
+ poll_dev-poll = adc_keypad_poll;
+ poll_dev-poll_interval = keypad-poll_interval;
+
+ input = poll_dev-input;
+ input-name = pdev-name;
+ input-phys = adc-keys/input0;
+
+ input-id.bustype = BUS_HOST;
+ input-id.vendor = 0x0001;
+ input-id.product = 0x0001;
+ input-id.version = 0x0100;
Why these particular values?
I just chose these because these are the values most other platform
input devices use, including gpio_keys and gpio_keys_polled.
--
To unsubscribe from this list: send the line unsubscribe linux-kernel in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Re: [PATCH 2/2] Input: Add driver for a generic ADC keypad
On 28/03/15 00:43, Andrew Bresticker wrote:
> Add a polled input driver for a keypad in which the buttons are connected
> in resistor ladders to an ADC. The IIO framework is used to claim and
> read the ADC channels.
>
> Signed-off-by: Andrew Bresticker
The IIO side of things looks fine.
> ---
> drivers/input/keyboard/Kconfig| 13 ++
> drivers/input/keyboard/Makefile | 1 +
> drivers/input/keyboard/adc-keys.c | 291
> ++
> 3 files changed, 305 insertions(+)
> create mode 100644 drivers/input/keyboard/adc-keys.c
>
> diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
> index a89ba7c..bbaff9e 100644
> --- a/drivers/input/keyboard/Kconfig
> +++ b/drivers/input/keyboard/Kconfig
> @@ -12,6 +12,19 @@ menuconfig INPUT_KEYBOARD
>
> if INPUT_KEYBOARD
>
> +config KEYBOARD_ADC
> + tristate "ADC Keypad"
> + depends on IIO
> + select INPUT_POLLDEV
> + help
> + This driver supports generic ADC keypads using IIO.
> +
> + Say Y here if your device has buttons connected in a resistor ladder
> + to an ADC.
> +
> + To compile this driver as a module, choose M here: the module will
> + be called adc-keys.
> +
> config KEYBOARD_ADP5520
> tristate "Keypad Support for ADP5520 PMIC"
> depends on PMIC_ADP5520
> diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile
> index 4707678..888fa62 100644
> --- a/drivers/input/keyboard/Makefile
> +++ b/drivers/input/keyboard/Makefile
> @@ -4,6 +4,7 @@
>
> # Each configuration option enables a list of files.
>
> +obj-$(CONFIG_KEYBOARD_ADC) += adc-keys.o
> obj-$(CONFIG_KEYBOARD_ADP5520) += adp5520-keys.o
> obj-$(CONFIG_KEYBOARD_ADP5588) += adp5588-keys.o
> obj-$(CONFIG_KEYBOARD_ADP5589) += adp5589-keys.o
> diff --git a/drivers/input/keyboard/adc-keys.c
> b/drivers/input/keyboard/adc-keys.c
> new file mode 100644
> index 000..1b9bcad
> --- /dev/null
> +++ b/drivers/input/keyboard/adc-keys.c
> @@ -0,0 +1,291 @@
> +/*
> + * ADC keypad driver
> + *
> + * Copyright (C) 2015 Google, Inc.
> + *
> + * Based on /drivers/input/keybaord/gpio_keys_polled.c:
> + * Copyright (C) 2007-2010 Gabor Juhos
> + * Copyright (C) 2010 Nuno Goncalves
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#include
> +#include
> +#include
> +#include
> +#include
> +#include
> +#include
> +#include
> +
> +struct adc_key {
> + const char *desc;
> + unsigned int type;
> + unsigned int code;
> + unsigned int min_uV;
> + unsigned int max_uV;
> +};
> +
> +struct adc_chan_map {
> + struct adc_key *keys;
> + unsigned int num_keys;
> + int last_key;
> +};
> +
> +struct adc_keypad {
> + struct device *dev;
> + struct input_polled_dev *poll_dev;
> + unsigned int poll_interval;
> + bool autorepeat;
> + struct iio_channel *iio_chans;
> + unsigned int num_chans;
> + struct adc_chan_map *chan_map;
> +};
> +
> +static void adc_keypad_poll_chan(struct adc_keypad *keypad, unsigned int
> chan)
> +{
> + struct adc_chan_map *chan_map = >chan_map[chan];
> + struct input_dev *input = keypad->poll_dev->input;
> + struct adc_key *key;
> + unsigned int adc_uV;
> + int ret, val, i;
> +
> + ret = iio_read_channel_processed(>iio_chans[chan], );
> + if (ret < 0) {
> + dev_err(keypad->dev, "Failed to read ADC: %d\n", ret);
> + return;
> + }
> + adc_uV = val * 1000;
> +
> + for (i = 0; i < chan_map->num_keys; i++) {
> + if (adc_uV >= chan_map->keys[i].min_uV &&
> + adc_uV <= chan_map->keys[i].max_uV)
> + break;
> + }
> + if (i >= chan_map->num_keys)
> + i = -1;
> +
> + if (i != chan_map->last_key) {
> + if (chan_map->last_key >= 0) {
> + key = _map->keys[chan_map->last_key];
> + input_event(input, key->type, key->code, 0);
> + }
> + if (i >= 0) {
> + key = _map->keys[i];
> + input_event(input, key->type, key->code, 1);
> + }
> + input_sync(input);
> + chan_map->last_key = i;
> + }
> +}
> +
> +static void adc_keypad_poll(struct input_polled_dev *poll_dev)
> +{
> + struct adc_keypad *keypad = poll_dev->private;
> + unsigned int i;
> +
> + for (i = 0; i < keypad->num_chans; i++)
> + adc_keypad_poll_chan(keypad, i);
> +}
> +
> +static int adc_keypad_of_parse_chan(struct adc_keypad *keypad,
> + unsigned int chan)
> +{
> + struct device_node *child, *np = keypad->dev->of_node;
> + struct adc_key *keys;
> + unsigned int i = 0;
> + int ret;
> +
Re: [PATCH 2/2] Input: Add driver for a generic ADC keypad
On 28/03/15 00:43, Andrew Bresticker wrote:
Add a polled input driver for a keypad in which the buttons are connected
in resistor ladders to an ADC. The IIO framework is used to claim and
read the ADC channels.
Signed-off-by: Andrew Bresticker abres...@chromium.org
The IIO side of things looks fine.
---
drivers/input/keyboard/Kconfig| 13 ++
drivers/input/keyboard/Makefile | 1 +
drivers/input/keyboard/adc-keys.c | 291
++
3 files changed, 305 insertions(+)
create mode 100644 drivers/input/keyboard/adc-keys.c
diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
index a89ba7c..bbaff9e 100644
--- a/drivers/input/keyboard/Kconfig
+++ b/drivers/input/keyboard/Kconfig
@@ -12,6 +12,19 @@ menuconfig INPUT_KEYBOARD
if INPUT_KEYBOARD
+config KEYBOARD_ADC
+ tristate ADC Keypad
+ depends on IIO
+ select INPUT_POLLDEV
+ help
+ This driver supports generic ADC keypads using IIO.
+
+ Say Y here if your device has buttons connected in a resistor ladder
+ to an ADC.
+
+ To compile this driver as a module, choose M here: the module will
+ be called adc-keys.
+
config KEYBOARD_ADP5520
tristate Keypad Support for ADP5520 PMIC
depends on PMIC_ADP5520
diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile
index 4707678..888fa62 100644
--- a/drivers/input/keyboard/Makefile
+++ b/drivers/input/keyboard/Makefile
@@ -4,6 +4,7 @@
# Each configuration option enables a list of files.
+obj-$(CONFIG_KEYBOARD_ADC) += adc-keys.o
obj-$(CONFIG_KEYBOARD_ADP5520) += adp5520-keys.o
obj-$(CONFIG_KEYBOARD_ADP5588) += adp5588-keys.o
obj-$(CONFIG_KEYBOARD_ADP5589) += adp5589-keys.o
diff --git a/drivers/input/keyboard/adc-keys.c
b/drivers/input/keyboard/adc-keys.c
new file mode 100644
index 000..1b9bcad
--- /dev/null
+++ b/drivers/input/keyboard/adc-keys.c
@@ -0,0 +1,291 @@
+/*
+ * ADC keypad driver
+ *
+ * Copyright (C) 2015 Google, Inc.
+ *
+ * Based on /drivers/input/keybaord/gpio_keys_polled.c:
+ * Copyright (C) 2007-2010 Gabor Juhos juh...@openwrt.org
+ * Copyright (C) 2010 Nuno Goncalves nuno...@gmail.com
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include linux/iio/consumer.h
+#include linux/input.h
+#include linux/input-polldev.h
+#include linux/kernel.h
+#include linux/module.h
+#include linux/of.h
+#include linux/platform_device.h
+#include linux/slab.h
+
+struct adc_key {
+ const char *desc;
+ unsigned int type;
+ unsigned int code;
+ unsigned int min_uV;
+ unsigned int max_uV;
+};
+
+struct adc_chan_map {
+ struct adc_key *keys;
+ unsigned int num_keys;
+ int last_key;
+};
+
+struct adc_keypad {
+ struct device *dev;
+ struct input_polled_dev *poll_dev;
+ unsigned int poll_interval;
+ bool autorepeat;
+ struct iio_channel *iio_chans;
+ unsigned int num_chans;
+ struct adc_chan_map *chan_map;
+};
+
+static void adc_keypad_poll_chan(struct adc_keypad *keypad, unsigned int
chan)
+{
+ struct adc_chan_map *chan_map = keypad-chan_map[chan];
+ struct input_dev *input = keypad-poll_dev-input;
+ struct adc_key *key;
+ unsigned int adc_uV;
+ int ret, val, i;
+
+ ret = iio_read_channel_processed(keypad-iio_chans[chan], val);
+ if (ret 0) {
+ dev_err(keypad-dev, Failed to read ADC: %d\n, ret);
+ return;
+ }
+ adc_uV = val * 1000;
+
+ for (i = 0; i chan_map-num_keys; i++) {
+ if (adc_uV = chan_map-keys[i].min_uV
+ adc_uV = chan_map-keys[i].max_uV)
+ break;
+ }
+ if (i = chan_map-num_keys)
+ i = -1;
+
+ if (i != chan_map-last_key) {
+ if (chan_map-last_key = 0) {
+ key = chan_map-keys[chan_map-last_key];
+ input_event(input, key-type, key-code, 0);
+ }
+ if (i = 0) {
+ key = chan_map-keys[i];
+ input_event(input, key-type, key-code, 1);
+ }
+ input_sync(input);
+ chan_map-last_key = i;
+ }
+}
+
+static void adc_keypad_poll(struct input_polled_dev *poll_dev)
+{
+ struct adc_keypad *keypad = poll_dev-private;
+ unsigned int i;
+
+ for (i = 0; i keypad-num_chans; i++)
+ adc_keypad_poll_chan(keypad, i);
+}
+
+static int adc_keypad_of_parse_chan(struct adc_keypad *keypad,
+ unsigned int chan)
+{
+ struct device_node *child, *np = keypad-dev-of_node;
+ struct adc_key *keys;
+ unsigned int i = 0;
+
[PATCH 2/2] Input: Add driver for a generic ADC keypad
Add a polled input driver for a keypad in which the buttons are connected
in resistor ladders to an ADC. The IIO framework is used to claim and
read the ADC channels.
Signed-off-by: Andrew Bresticker
---
drivers/input/keyboard/Kconfig| 13 ++
drivers/input/keyboard/Makefile | 1 +
drivers/input/keyboard/adc-keys.c | 291 ++
3 files changed, 305 insertions(+)
create mode 100644 drivers/input/keyboard/adc-keys.c
diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
index a89ba7c..bbaff9e 100644
--- a/drivers/input/keyboard/Kconfig
+++ b/drivers/input/keyboard/Kconfig
@@ -12,6 +12,19 @@ menuconfig INPUT_KEYBOARD
if INPUT_KEYBOARD
+config KEYBOARD_ADC
+ tristate "ADC Keypad"
+ depends on IIO
+ select INPUT_POLLDEV
+ help
+ This driver supports generic ADC keypads using IIO.
+
+ Say Y here if your device has buttons connected in a resistor ladder
+ to an ADC.
+
+ To compile this driver as a module, choose M here: the module will
+ be called adc-keys.
+
config KEYBOARD_ADP5520
tristate "Keypad Support for ADP5520 PMIC"
depends on PMIC_ADP5520
diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile
index 4707678..888fa62 100644
--- a/drivers/input/keyboard/Makefile
+++ b/drivers/input/keyboard/Makefile
@@ -4,6 +4,7 @@
# Each configuration option enables a list of files.
+obj-$(CONFIG_KEYBOARD_ADC) += adc-keys.o
obj-$(CONFIG_KEYBOARD_ADP5520) += adp5520-keys.o
obj-$(CONFIG_KEYBOARD_ADP5588) += adp5588-keys.o
obj-$(CONFIG_KEYBOARD_ADP5589) += adp5589-keys.o
diff --git a/drivers/input/keyboard/adc-keys.c
b/drivers/input/keyboard/adc-keys.c
new file mode 100644
index 000..1b9bcad
--- /dev/null
+++ b/drivers/input/keyboard/adc-keys.c
@@ -0,0 +1,291 @@
+/*
+ * ADC keypad driver
+ *
+ * Copyright (C) 2015 Google, Inc.
+ *
+ * Based on /drivers/input/keybaord/gpio_keys_polled.c:
+ * Copyright (C) 2007-2010 Gabor Juhos
+ * Copyright (C) 2010 Nuno Goncalves
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include
+#include
+#include
+#include
+#include
+#include
+#include
+#include
+
+struct adc_key {
+ const char *desc;
+ unsigned int type;
+ unsigned int code;
+ unsigned int min_uV;
+ unsigned int max_uV;
+};
+
+struct adc_chan_map {
+ struct adc_key *keys;
+ unsigned int num_keys;
+ int last_key;
+};
+
+struct adc_keypad {
+ struct device *dev;
+ struct input_polled_dev *poll_dev;
+ unsigned int poll_interval;
+ bool autorepeat;
+ struct iio_channel *iio_chans;
+ unsigned int num_chans;
+ struct adc_chan_map *chan_map;
+};
+
+static void adc_keypad_poll_chan(struct adc_keypad *keypad, unsigned int chan)
+{
+ struct adc_chan_map *chan_map = >chan_map[chan];
+ struct input_dev *input = keypad->poll_dev->input;
+ struct adc_key *key;
+ unsigned int adc_uV;
+ int ret, val, i;
+
+ ret = iio_read_channel_processed(>iio_chans[chan], );
+ if (ret < 0) {
+ dev_err(keypad->dev, "Failed to read ADC: %d\n", ret);
+ return;
+ }
+ adc_uV = val * 1000;
+
+ for (i = 0; i < chan_map->num_keys; i++) {
+ if (adc_uV >= chan_map->keys[i].min_uV &&
+ adc_uV <= chan_map->keys[i].max_uV)
+ break;
+ }
+ if (i >= chan_map->num_keys)
+ i = -1;
+
+ if (i != chan_map->last_key) {
+ if (chan_map->last_key >= 0) {
+ key = _map->keys[chan_map->last_key];
+ input_event(input, key->type, key->code, 0);
+ }
+ if (i >= 0) {
+ key = _map->keys[i];
+ input_event(input, key->type, key->code, 1);
+ }
+ input_sync(input);
+ chan_map->last_key = i;
+ }
+}
+
+static void adc_keypad_poll(struct input_polled_dev *poll_dev)
+{
+ struct adc_keypad *keypad = poll_dev->private;
+ unsigned int i;
+
+ for (i = 0; i < keypad->num_chans; i++)
+ adc_keypad_poll_chan(keypad, i);
+}
+
+static int adc_keypad_of_parse_chan(struct adc_keypad *keypad,
+ unsigned int chan)
+{
+ struct device_node *child, *np = keypad->dev->of_node;
+ struct adc_key *keys;
+ unsigned int i = 0;
+ int ret;
+
+ for_each_child_of_node(np, child) {
+ unsigned int c;
+
+ ret = of_property_read_u32(child, "channel", );
+ if (ret < 0)
+ continue;
+ if (c != chan)
+ continue;
+
[PATCH 2/2] Input: Add driver for a generic ADC keypad
Add a polled input driver for a keypad in which the buttons are connected
in resistor ladders to an ADC. The IIO framework is used to claim and
read the ADC channels.
Signed-off-by: Andrew Bresticker abres...@chromium.org
---
drivers/input/keyboard/Kconfig| 13 ++
drivers/input/keyboard/Makefile | 1 +
drivers/input/keyboard/adc-keys.c | 291 ++
3 files changed, 305 insertions(+)
create mode 100644 drivers/input/keyboard/adc-keys.c
diff --git a/drivers/input/keyboard/Kconfig b/drivers/input/keyboard/Kconfig
index a89ba7c..bbaff9e 100644
--- a/drivers/input/keyboard/Kconfig
+++ b/drivers/input/keyboard/Kconfig
@@ -12,6 +12,19 @@ menuconfig INPUT_KEYBOARD
if INPUT_KEYBOARD
+config KEYBOARD_ADC
+ tristate ADC Keypad
+ depends on IIO
+ select INPUT_POLLDEV
+ help
+ This driver supports generic ADC keypads using IIO.
+
+ Say Y here if your device has buttons connected in a resistor ladder
+ to an ADC.
+
+ To compile this driver as a module, choose M here: the module will
+ be called adc-keys.
+
config KEYBOARD_ADP5520
tristate Keypad Support for ADP5520 PMIC
depends on PMIC_ADP5520
diff --git a/drivers/input/keyboard/Makefile b/drivers/input/keyboard/Makefile
index 4707678..888fa62 100644
--- a/drivers/input/keyboard/Makefile
+++ b/drivers/input/keyboard/Makefile
@@ -4,6 +4,7 @@
# Each configuration option enables a list of files.
+obj-$(CONFIG_KEYBOARD_ADC) += adc-keys.o
obj-$(CONFIG_KEYBOARD_ADP5520) += adp5520-keys.o
obj-$(CONFIG_KEYBOARD_ADP5588) += adp5588-keys.o
obj-$(CONFIG_KEYBOARD_ADP5589) += adp5589-keys.o
diff --git a/drivers/input/keyboard/adc-keys.c
b/drivers/input/keyboard/adc-keys.c
new file mode 100644
index 000..1b9bcad
--- /dev/null
+++ b/drivers/input/keyboard/adc-keys.c
@@ -0,0 +1,291 @@
+/*
+ * ADC keypad driver
+ *
+ * Copyright (C) 2015 Google, Inc.
+ *
+ * Based on /drivers/input/keybaord/gpio_keys_polled.c:
+ * Copyright (C) 2007-2010 Gabor Juhos juh...@openwrt.org
+ * Copyright (C) 2010 Nuno Goncalves nuno...@gmail.com
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include linux/iio/consumer.h
+#include linux/input.h
+#include linux/input-polldev.h
+#include linux/kernel.h
+#include linux/module.h
+#include linux/of.h
+#include linux/platform_device.h
+#include linux/slab.h
+
+struct adc_key {
+ const char *desc;
+ unsigned int type;
+ unsigned int code;
+ unsigned int min_uV;
+ unsigned int max_uV;
+};
+
+struct adc_chan_map {
+ struct adc_key *keys;
+ unsigned int num_keys;
+ int last_key;
+};
+
+struct adc_keypad {
+ struct device *dev;
+ struct input_polled_dev *poll_dev;
+ unsigned int poll_interval;
+ bool autorepeat;
+ struct iio_channel *iio_chans;
+ unsigned int num_chans;
+ struct adc_chan_map *chan_map;
+};
+
+static void adc_keypad_poll_chan(struct adc_keypad *keypad, unsigned int chan)
+{
+ struct adc_chan_map *chan_map = keypad-chan_map[chan];
+ struct input_dev *input = keypad-poll_dev-input;
+ struct adc_key *key;
+ unsigned int adc_uV;
+ int ret, val, i;
+
+ ret = iio_read_channel_processed(keypad-iio_chans[chan], val);
+ if (ret 0) {
+ dev_err(keypad-dev, Failed to read ADC: %d\n, ret);
+ return;
+ }
+ adc_uV = val * 1000;
+
+ for (i = 0; i chan_map-num_keys; i++) {
+ if (adc_uV = chan_map-keys[i].min_uV
+ adc_uV = chan_map-keys[i].max_uV)
+ break;
+ }
+ if (i = chan_map-num_keys)
+ i = -1;
+
+ if (i != chan_map-last_key) {
+ if (chan_map-last_key = 0) {
+ key = chan_map-keys[chan_map-last_key];
+ input_event(input, key-type, key-code, 0);
+ }
+ if (i = 0) {
+ key = chan_map-keys[i];
+ input_event(input, key-type, key-code, 1);
+ }
+ input_sync(input);
+ chan_map-last_key = i;
+ }
+}
+
+static void adc_keypad_poll(struct input_polled_dev *poll_dev)
+{
+ struct adc_keypad *keypad = poll_dev-private;
+ unsigned int i;
+
+ for (i = 0; i keypad-num_chans; i++)
+ adc_keypad_poll_chan(keypad, i);
+}
+
+static int adc_keypad_of_parse_chan(struct adc_keypad *keypad,
+ unsigned int chan)
+{
+ struct device_node *child, *np = keypad-dev-of_node;
+ struct adc_key *keys;
+ unsigned int i = 0;
+ int ret;
+
+ for_each_child_of_node(np, child) {
+ unsigned int c;
+
+ ret =
