Re: [PATCH v3] iio: potentiometer: add driver for Maxim Integrated DS1803
On 10/04/16 12:23, Slawomir Stepien wrote:
> The following functions are supported:
> - write, read potentiometer value
> - potentiometer scale
>
> Datasheet: https://datasheets.maximintegrated.com/en/ds/DS1803.pdf
>
> Signed-off-by: Slawomir Stepien
Applied to the togreg branch of iio.git - initially pushed out as testing
for the autobuilders to play with it.
Thanks,
Jonathan
> ---
> Changes since v2:
> - Use array of u8 as a result type for i2c_master_recv() call
>
> Changes since v1:
> - Removed unnecessary include file
> - Use i2c_master_recv() in place of i2c_smbus_read_word_swapped()
> - On raw write make sure val2 is zero
> - Use ARRAY_SIZE when possible
>
> .../bindings/iio/potentiometer/ds1803.txt | 21 +++
> drivers/iio/potentiometer/Kconfig | 10 ++
> drivers/iio/potentiometer/Makefile | 1 +
> drivers/iio/potentiometer/ds1803.c | 173
> +
> 4 files changed, 205 insertions(+)
> create mode 100644
> Documentation/devicetree/bindings/iio/potentiometer/ds1803.txt
> create mode 100644 drivers/iio/potentiometer/ds1803.c
>
> diff --git a/Documentation/devicetree/bindings/iio/potentiometer/ds1803.txt
> b/Documentation/devicetree/bindings/iio/potentiometer/ds1803.txt
> new file mode 100644
> index 000..df77bf5
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/iio/potentiometer/ds1803.txt
> @@ -0,0 +1,21 @@
> +* Maxim Integrated DS1803 digital potentiometer driver
> +
> +The node for this driver must be a child node of a I2C controller, hence
> +all mandatory properties for your controller must be specified. See
> directory:
> +
> +Documentation/devicetree/bindings/i2c
> +
> +for more details.
> +
> +Required properties:
> + - compatible: Must be one of the following, depending on the
> + model:
> + "maxim,ds1803-010",
> + "maxim,ds1803-050",
> + "maxim,ds1803-100"
> +
> +Example:
> +ds1803: ds1803@1 {
> + reg = <0x28>;
> + compatible = "maxim,ds1803-010";
> +};
> diff --git a/drivers/iio/potentiometer/Kconfig
> b/drivers/iio/potentiometer/Kconfig
> index 7ea069b..6acb238 100644
> --- a/drivers/iio/potentiometer/Kconfig
> +++ b/drivers/iio/potentiometer/Kconfig
> @@ -5,6 +5,16 @@
>
> menu "Digital potentiometers"
>
> +config DS1803
> + tristate "Maxim Integrated DS1803 Digital Potentiometer driver"
> + depends on I2C
> + help
> + Say yes here to build support for the Maxim Integrated DS1803
> + digital potentiomenter chip.
> +
> + To compile this driver as a module, choose M here: the
> + module will be called ds1803.
> +
> config MCP4131
> tristate "Microchip MCP413X/414X/415X/416X/423X/424X/425X/426X Digital
> Potentiometer driver"
> depends on SPI
> diff --git a/drivers/iio/potentiometer/Makefile
> b/drivers/iio/potentiometer/Makefile
> index 91a80f8..6007faa 100644
> --- a/drivers/iio/potentiometer/Makefile
> +++ b/drivers/iio/potentiometer/Makefile
> @@ -3,6 +3,7 @@
> #
>
> # When adding new entries keep the list in alphabetical order
> +obj-$(CONFIG_DS1803) += ds1803.o
> obj-$(CONFIG_MCP4131) += mcp4131.o
> obj-$(CONFIG_MCP4531) += mcp4531.o
> obj-$(CONFIG_TPL0102) += tpl0102.o
> diff --git a/drivers/iio/potentiometer/ds1803.c
> b/drivers/iio/potentiometer/ds1803.c
> new file mode 100644
> index 000..fb9e2a3
> --- /dev/null
> +++ b/drivers/iio/potentiometer/ds1803.c
> @@ -0,0 +1,173 @@
> +/*
> + * Maxim Integrated DS1803 digital potentiometer driver
> + * Copyright (c) 2016 Slawomir Stepien
> + *
> + * Datasheet: https://datasheets.maximintegrated.com/en/ds/DS1803.pdf
> + *
> + * DEVID #Wipers #Positions Resistor Opts (kOhm)i2c address
> + * ds18032 256 10, 50, 100 0101xxx
> + *
> + * 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
> +
> +#define DS1803_MAX_POS 255
> +#define DS1803_WRITE(chan) (0xa8 | ((chan) + 1))
> +
> +enum ds1803_type {
> + DS1803_010,
> + DS1803_050,
> + DS1803_100,
> +};
> +
> +struct ds1803_cfg {
> + int kohms;
> +};
> +
> +static const struct ds1803_cfg ds1803_cfg[] = {
> + [DS1803_010] = { .kohms = 10, },
> + [DS1803_050] = { .kohms = 50, },
> + [DS1803_100] = { .kohms = 100, },
> +};
> +
> +struct ds1803_data {
> + struct i2c_client *client;
> + const struct ds1803_cfg *cfg;
> +};
> +
> +#define DS1803_CHANNEL(ch) { \
> + .type = IIO_RESISTANCE, \
> + .indexed = 1, \
> + .output = 1,\
> + .channel = (ch
[PATCH v3] iio: potentiometer: add driver for Maxim Integrated DS1803
The following functions are supported:
- write, read potentiometer value
- potentiometer scale
Datasheet: https://datasheets.maximintegrated.com/en/ds/DS1803.pdf
Signed-off-by: Slawomir Stepien
---
Changes since v2:
- Use array of u8 as a result type for i2c_master_recv() call
Changes since v1:
- Removed unnecessary include file
- Use i2c_master_recv() in place of i2c_smbus_read_word_swapped()
- On raw write make sure val2 is zero
- Use ARRAY_SIZE when possible
.../bindings/iio/potentiometer/ds1803.txt | 21 +++
drivers/iio/potentiometer/Kconfig | 10 ++
drivers/iio/potentiometer/Makefile | 1 +
drivers/iio/potentiometer/ds1803.c | 173 +
4 files changed, 205 insertions(+)
create mode 100644
Documentation/devicetree/bindings/iio/potentiometer/ds1803.txt
create mode 100644 drivers/iio/potentiometer/ds1803.c
diff --git a/Documentation/devicetree/bindings/iio/potentiometer/ds1803.txt
b/Documentation/devicetree/bindings/iio/potentiometer/ds1803.txt
new file mode 100644
index 000..df77bf5
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/potentiometer/ds1803.txt
@@ -0,0 +1,21 @@
+* Maxim Integrated DS1803 digital potentiometer driver
+
+The node for this driver must be a child node of a I2C controller, hence
+all mandatory properties for your controller must be specified. See directory:
+
+Documentation/devicetree/bindings/i2c
+
+for more details.
+
+Required properties:
+ - compatible: Must be one of the following, depending on the
+ model:
+ "maxim,ds1803-010",
+ "maxim,ds1803-050",
+ "maxim,ds1803-100"
+
+Example:
+ds1803: ds1803@1 {
+ reg = <0x28>;
+ compatible = "maxim,ds1803-010";
+};
diff --git a/drivers/iio/potentiometer/Kconfig
b/drivers/iio/potentiometer/Kconfig
index 7ea069b..6acb238 100644
--- a/drivers/iio/potentiometer/Kconfig
+++ b/drivers/iio/potentiometer/Kconfig
@@ -5,6 +5,16 @@
menu "Digital potentiometers"
+config DS1803
+ tristate "Maxim Integrated DS1803 Digital Potentiometer driver"
+ depends on I2C
+ help
+ Say yes here to build support for the Maxim Integrated DS1803
+ digital potentiomenter chip.
+
+ To compile this driver as a module, choose M here: the
+ module will be called ds1803.
+
config MCP4131
tristate "Microchip MCP413X/414X/415X/416X/423X/424X/425X/426X Digital
Potentiometer driver"
depends on SPI
diff --git a/drivers/iio/potentiometer/Makefile
b/drivers/iio/potentiometer/Makefile
index 91a80f8..6007faa 100644
--- a/drivers/iio/potentiometer/Makefile
+++ b/drivers/iio/potentiometer/Makefile
@@ -3,6 +3,7 @@
#
# When adding new entries keep the list in alphabetical order
+obj-$(CONFIG_DS1803) += ds1803.o
obj-$(CONFIG_MCP4131) += mcp4131.o
obj-$(CONFIG_MCP4531) += mcp4531.o
obj-$(CONFIG_TPL0102) += tpl0102.o
diff --git a/drivers/iio/potentiometer/ds1803.c
b/drivers/iio/potentiometer/ds1803.c
new file mode 100644
index 000..fb9e2a3
--- /dev/null
+++ b/drivers/iio/potentiometer/ds1803.c
@@ -0,0 +1,173 @@
+/*
+ * Maxim Integrated DS1803 digital potentiometer driver
+ * Copyright (c) 2016 Slawomir Stepien
+ *
+ * Datasheet: https://datasheets.maximintegrated.com/en/ds/DS1803.pdf
+ *
+ * DEVID #Wipers #Positions Resistor Opts (kOhm)i2c address
+ * ds1803 2 256 10, 50, 100 0101xxx
+ *
+ * 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
+
+#define DS1803_MAX_POS 255
+#define DS1803_WRITE(chan) (0xa8 | ((chan) + 1))
+
+enum ds1803_type {
+ DS1803_010,
+ DS1803_050,
+ DS1803_100,
+};
+
+struct ds1803_cfg {
+ int kohms;
+};
+
+static const struct ds1803_cfg ds1803_cfg[] = {
+ [DS1803_010] = { .kohms = 10, },
+ [DS1803_050] = { .kohms = 50, },
+ [DS1803_100] = { .kohms = 100, },
+};
+
+struct ds1803_data {
+ struct i2c_client *client;
+ const struct ds1803_cfg *cfg;
+};
+
+#define DS1803_CHANNEL(ch) { \
+ .type = IIO_RESISTANCE, \
+ .indexed = 1, \
+ .output = 1,\
+ .channel = (ch),\
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
+}
+
+static const struct iio_chan_spec ds1803_channels[] = {
+ DS1803_CHANNEL(0),
+ DS1803_CHANNEL(1),
+};
+
+static int ds1803_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+
