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Message-ID: <56EE7A81.9010503@kernel.org>
Date: Sun, 20 Mar 2016 10:25:05 +0000
From: Jonathan Cameron <jic23@...nel.org>
To: Peter Meerwald-Stadler <pmeerw@...erw.net>,
Slawomir Stepien <sst@...zta.fm>
Cc: knaack.h@....de, lars@...afoo.de, linux-iio@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] iio: add driver for Microchip
MCP413X/414X/415X/416X/423X/424X/425X/426X
On 19/03/16 13:48, Peter Meerwald-Stadler wrote:
>
>> The following functionalities are supported:
>> - write, read from volatile memory
>>
>> Datasheet: http://ww1.microchip.com/downloads/en/DeviceDoc/22060b.pdf
>
> comments below
A few more little bits from me. Mostly looking good though.
Jonathan
>
>> Signed-off-by: Slawomir Stepien <sst@...zta.fm>
>> ---
>> This is v2 of patch: "iio: add driver for Microchip MCP414X/416X/424X/426X"
>>
>> Changes since v1:
>> - One line summary changed
>> - Fixed module name and OF compatible
>> - Based code on Peter Rosin's code from mcp4531.c
>> - No additional sysfs attributes
>> - Deleted not used devid struct memeber
>> - Changed mcp4131_exec function arguments:
>> - write value is now u16
>> - no need to pass return buffer array - rx array from mcp4131_data is used
>> - Added missing new line characters to dev_info
>> ---
>> .../bindings/iio/potentiometer/mcp4131.txt | 84 ++++
>> drivers/iio/potentiometer/Kconfig | 18 +
>> drivers/iio/potentiometer/Makefile | 1 +
>> drivers/iio/potentiometer/mcp4131.c | 523 +++++++++++++++++++++
>> 4 files changed, 626 insertions(+)
>> create mode 100644 Documentation/devicetree/bindings/iio/potentiometer/mcp4131.txt
>> create mode 100644 drivers/iio/potentiometer/mcp4131.c
>>
>> diff --git a/Documentation/devicetree/bindings/iio/potentiometer/mcp4131.txt b/Documentation/devicetree/bindings/iio/potentiometer/mcp4131.txt
>> new file mode 100644
>> index 0000000..3ccba16
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/iio/potentiometer/mcp4131.txt
>> @@ -0,0 +1,84 @@
>> +* Microchip MCP413X/414X/415X/416X/423X/424X/425X/426X Digital Potentiometer
>> + driver
>> +
>> +The node for this driver must be a child node of a SPI controller, hence
>> +all mandatory properties described in
>> +
>> + Documentation/devicetree/bindings/spi/spi-bus.txt
>> +
>> +must be specified.
>> +
>> +Required properties:
>> + - compatible: Must be one of the following, depending on the
>> + model:
>> + "microchip,mcp4131-502"
>> + "microchip,mcp4131-103"
>> + "microchip,mcp4131-503"
>> + "microchip,mcp4131-104"
>> + "microchip,mcp4132-502"
>> + "microchip,mcp4132-103"
>> + "microchip,mcp4132-503"
>> + "microchip,mcp4132-104"
>> + "microchip,mcp4141-502"
>> + "microchip,mcp4141-103"
>> + "microchip,mcp4141-503"
>> + "microchip,mcp4141-104"
>> + "microchip,mcp4142-502"
>> + "microchip,mcp4142-103"
>> + "microchip,mcp4142-503"
>> + "microchip,mcp4142-104"
>> + "microchip,mcp4151-502"
>> + "microchip,mcp4151-103"
>> + "microchip,mcp4151-503"
>> + "microchip,mcp4151-104"
>> + "microchip,mcp4152-502"
>> + "microchip,mcp4152-103"
>> + "microchip,mcp4152-503"
>> + "microchip,mcp4152-104"
>> + "microchip,mcp4161-502"
>> + "microchip,mcp4161-103"
>> + "microchip,mcp4161-503"
>> + "microchip,mcp4161-104"
>> + "microchip,mcp4162-502"
>> + "microchip,mcp4162-103"
>> + "microchip,mcp4162-503"
>> + "microchip,mcp4162-104"
>> + "microchip,mcp4231-502"
>> + "microchip,mcp4231-103"
>> + "microchip,mcp4231-503"
>> + "microchip,mcp4231-104"
>> + "microchip,mcp4232-502"
>> + "microchip,mcp4232-103"
>> + "microchip,mcp4232-503"
>> + "microchip,mcp4232-104"
>> + "microchip,mcp4241-502"
>> + "microchip,mcp4241-103"
>> + "microchip,mcp4241-503"
>> + "microchip,mcp4241-104"
>> + "microchip,mcp4242-502"
>> + "microchip,mcp4242-103"
>> + "microchip,mcp4242-503"
>> + "microchip,mcp4242-104"
>> + "microchip,mcp4251-502"
>> + "microchip,mcp4251-103"
>> + "microchip,mcp4251-503"
>> + "microchip,mcp4251-104"
>> + "microchip,mcp4252-502"
>> + "microchip,mcp4252-103"
>> + "microchip,mcp4252-503"
>> + "microchip,mcp4252-104"
>> + "microchip,mcp4261-502"
>> + "microchip,mcp4261-103"
>> + "microchip,mcp4261-503"
>> + "microchip,mcp4261-104"
>> + "microchip,mcp4262-502"
>> + "microchip,mcp4262-103"
>> + "microchip,mcp4262-503"
>> + "microchip,mcp4262-104"
>> +
>> +Example:
>> +mcp4131: mcp4131@0 {
>> + compatible = "mcp4131-502";
>> + reg = <0>;
>> + spi-max-frequency = <500000>;
>> +};
>> diff --git a/drivers/iio/potentiometer/Kconfig b/drivers/iio/potentiometer/Kconfig
>> index fd75db7..5ef181a 100644
>> --- a/drivers/iio/potentiometer/Kconfig
>> +++ b/drivers/iio/potentiometer/Kconfig
>> @@ -5,6 +5,24 @@
>>
>> menu "Digital potentiometers"
>>
>> +config MCP4131
>> + tristate "Microchip MCP413X/414X/415X/416X/423X/424X/425X/426X Digital Potentiometer driver"
>> + depends on SPI
>> + help
>> + Say yes here to build support for the Microchip
>> + MCP4131, MCP4132,
>> + MCP4141, MCP4142,
>> + MCP4151, MCP4152,
>> + MCP4161, MCP4162,
>> + MCP4231, MCP4232,
>> + MCP4241, MCP4242,
>> + MCP4251, MCP4252,
>> + MCP4261, MCP4262,
>> + digital potentiomenter chips.
>> +
>> + To compile this driver as a module, choose M here: the
>> + module will be called mcp4131.
>> +
>> config MCP4531
>> tristate "Microchip MCP45xx/MCP46xx Digital Potentiometer driver"
>> depends on I2C
>> diff --git a/drivers/iio/potentiometer/Makefile b/drivers/iio/potentiometer/Makefile
>> index 8afe492..cd5c80b 100644
>> --- a/drivers/iio/potentiometer/Makefile
>> +++ b/drivers/iio/potentiometer/Makefile
>> @@ -3,4 +3,5 @@
>> #
>>
>> # When adding new entries keep the list in alphabetical order
>> +obj-$(CONFIG_MCP4131) += mcp4131.o
>> obj-$(CONFIG_MCP4531) += mcp4531.o
>> diff --git a/drivers/iio/potentiometer/mcp4131.c b/drivers/iio/potentiometer/mcp4131.c
>> new file mode 100644
>> index 0000000..3553c9e
>> --- /dev/null
>> +++ b/drivers/iio/potentiometer/mcp4131.c
>> @@ -0,0 +1,523 @@
>> +/*
>> + * Industrial I/O driver for Microchip digital potentiometers
>> + *
>> + * Copyright (c) 2016 Slawomir Stepien
>> + * Based on: Peter Rosin's code from mcp4531.c
>> + *
>> + * Datasheet: http://ww1.microchip.com/downloads/en/DeviceDoc/22060b.pdf
>> + *
>> + * DEVID #Wipers #Positions Resistor Opts (kOhm)
>> + * mcp4131 1 129 5, 10, 50, 100
>> + * mcp4132 1 129 5, 10, 50, 100
>> + * mcp4141 1 129 5, 10, 50, 100
>> + * mcp4142 1 129 5, 10, 50, 100
>> + * mcp4151 1 257 5, 10, 50, 100
>> + * mcp4152 1 257 5, 10, 50, 100
>> + * mcp4161 1 257 5, 10, 50, 100
>> + * mcp4162 1 257 5, 10, 50, 100
>> + * mcp4231 2 129 5, 10, 50, 100
>> + * mcp4232 2 129 5, 10, 50, 100
>> + * mcp4241 2 129 5, 10, 50, 100
>> + * mcp4242 2 129 5, 10, 50, 100
>> + * mcp4251 2 257 5, 10, 50, 100
>> + * mcp4252 2 257 5, 10, 50, 100
>> + * mcp4261 2 257 5, 10, 50, 100
>> + * mcp4262 2 257 5, 10, 50, 100
>> + *
>> + * 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.
>> + */
>> +
>> +/*
>> + * TODO:
>> + * 1. Write wiper setting to EEPROM for EEPROM capable models.
>> + */
>> +
>> +#include <linux/module.h>
>> +#include <linux/spi/spi.h>
>> +#include <linux/err.h>
>> +
>> +#include <linux/iio/iio.h>
>> +
>> +#define MCP4131_WRITE (0x00 << 2)
>> +#define MCP4131_READ (0x03 << 2)
>> +
>> +#define MCP4131_WIPER_SHIFT (4)
>
> () not needed
>
>> +#define MCP4131_CMDERR(r) ((r[0]) & 0x02)
>> +#define MCP4131_RAW(r) ((r[0]) == 0xff ? 0x100 : (r[1]))
>> +
>> +struct mcp4131_cfg {
>> + int wipers;
>> + int max_pos;
>> + int kohms;
>> +};
>> +
>> +enum mcp4131_type {
>> + MCP413x_502 = 0,
>> + MCP413x_103,
>> + MCP413x_503,
>> + MCP413x_104,
>> + MCP414x_502,
>> + MCP414x_103,
>> + MCP414x_503,
>> + MCP414x_104,
>> + MCP415x_502,
>> + MCP415x_103,
>> + MCP415x_503,
>> + MCP415x_104,
>> + MCP416x_502,
>> + MCP416x_103,
>> + MCP416x_503,
>> + MCP416x_104,
>> + MCP423x_502,
>> + MCP423x_103,
>> + MCP423x_503,
>> + MCP423x_104,
>> + MCP424x_502,
>> + MCP424x_103,
>> + MCP424x_503,
>> + MCP424x_104,
>> + MCP425x_502,
>> + MCP425x_103,
>> + MCP425x_503,
>> + MCP425x_104,
>> + MCP426x_502,
>> + MCP426x_103,
>> + MCP426x_503,
>> + MCP426x_104,
>> +};
>> +
>> +static const struct mcp4131_cfg mcp4131_cfg[] = {
>> + [MCP413x_502] = { .wipers = 1, .max_pos = 128, .kohms = 5, },
>> + [MCP413x_103] = { .wipers = 1, .max_pos = 128, .kohms = 10, },
>> + [MCP413x_503] = { .wipers = 1, .max_pos = 128, .kohms = 50, },
>> + [MCP413x_104] = { .wipers = 1, .max_pos = 128, .kohms = 100, },
>> + [MCP414x_502] = { .wipers = 1, .max_pos = 128, .kohms = 5, },
>> + [MCP414x_103] = { .wipers = 1, .max_pos = 128, .kohms = 10, },
>> + [MCP414x_503] = { .wipers = 1, .max_pos = 128, .kohms = 50, },
>> + [MCP414x_104] = { .wipers = 1, .max_pos = 128, .kohms = 100, },
>> + [MCP415x_502] = { .wipers = 1, .max_pos = 256, .kohms = 5, },
>> + [MCP415x_103] = { .wipers = 1, .max_pos = 256, .kohms = 10, },
>> + [MCP415x_503] = { .wipers = 1, .max_pos = 256, .kohms = 50, },
>> + [MCP415x_104] = { .wipers = 1, .max_pos = 256, .kohms = 100, },
>> + [MCP416x_502] = { .wipers = 1, .max_pos = 256, .kohms = 5, },
>> + [MCP416x_103] = { .wipers = 1, .max_pos = 256, .kohms = 10, },
>> + [MCP416x_503] = { .wipers = 1, .max_pos = 256, .kohms = 50, },
>> + [MCP416x_104] = { .wipers = 1, .max_pos = 256, .kohms = 100, },
>> + [MCP423x_502] = { .wipers = 2, .max_pos = 128, .kohms = 5, },
>> + [MCP423x_103] = { .wipers = 2, .max_pos = 128, .kohms = 10, },
>> + [MCP423x_503] = { .wipers = 2, .max_pos = 128, .kohms = 50, },
>> + [MCP423x_104] = { .wipers = 2, .max_pos = 128, .kohms = 100, },
>> + [MCP424x_502] = { .wipers = 2, .max_pos = 128, .kohms = 5, },
>> + [MCP424x_103] = { .wipers = 2, .max_pos = 128, .kohms = 10, },
>> + [MCP424x_503] = { .wipers = 2, .max_pos = 128, .kohms = 50, },
>> + [MCP424x_104] = { .wipers = 2, .max_pos = 128, .kohms = 100, },
>> + [MCP425x_502] = { .wipers = 2, .max_pos = 256, .kohms = 5, },
>> + [MCP425x_103] = { .wipers = 2, .max_pos = 256, .kohms = 10, },
>> + [MCP425x_503] = { .wipers = 2, .max_pos = 256, .kohms = 50, },
>> + [MCP425x_104] = { .wipers = 2, .max_pos = 256, .kohms = 100, },
>> + [MCP426x_502] = { .wipers = 2, .max_pos = 256, .kohms = 5, },
>> + [MCP426x_103] = { .wipers = 2, .max_pos = 256, .kohms = 10, },
>> + [MCP426x_503] = { .wipers = 2, .max_pos = 256, .kohms = 50, },
>> + [MCP426x_104] = { .wipers = 2, .max_pos = 256, .kohms = 100, },
>> +};
>> +
>> +struct mcp4131_data {
>> + struct spi_device *spi;
This is only used to lookup elements of your cfg array, I'd just have
a pointer to the relevant element of that array in here instead.
struct mcp4131_cfg *cfg;
and in probe do
data->cfg = &mcp4131_cfg[id];
>> + unsigned long devid;
>> + struct mutex lock;
>> + u8 tx[2], rx[2];
>
> alignment requirements for SPI transfer?
By which he means put them at the end of this structure and
mark the with __cacheline_aligned. It's not technically about alignment
but rather about ensuring nothing else is in the cacheline which will on some
spi devices be scrubbed when a transaction occurs.
>
>> + struct spi_transfer xfer;
>> + struct spi_message msg;
>> +};
>> +
>> +#define MCP4131_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 mcp4131_channels[] = {
>> + MCP4131_CHANNEL(0),
>> + MCP4131_CHANNEL(1),
>> +};
>> +
>> +static int mcp4131_exec(struct mcp4131_data *data,
>> + u8 addr, u8 cmd,
>> + u16 val)
>> +{
>> + int err;
>> + struct spi_device *spi = data->spi;
>> +
>> + data->rx[0] = 0;
>> + data->rx[1] = 0;
>
> initialization needed?
>
> setup of data->xfer + data->tx is done outside the lock, this seems wrong
agreed.
>
>> +
>> + switch (cmd) {
>> + case MCP4131_READ:
>> + data->xfer.len = 2; /* Two bytes transfer for this command */
>> + data->tx[0] = (addr << MCP4131_WIPER_SHIFT) | MCP4131_READ;
>> + data->tx[1] = 0;
>> + break;
>> +
>> + case MCP4131_WRITE:
>> + data->xfer.len = 2;
>> + data->tx[0] = (addr << MCP4131_WIPER_SHIFT) |
>> + MCP4131_WRITE | (val >> 8);
>> + data->tx[1] = val & 0xFF; /* 8 bits here */
>> + break;
>> +
>> + default:
>> + return -EINVAL;
>> + }
>> +
>> + dev_dbg(&spi->dev, "mcp4131_exec: tx0: 0x%x tx1: 0x%x\n",
>> + data->tx[0], data->tx[1]);
>> +
>> + mutex_lock(&data->lock);
>> + spi_message_init(&data->msg);
>> + spi_message_add_tail(&data->xfer, &data->msg);
>> +
>> + err = spi_sync(spi, &data->msg);
>> + if (err) {
>> + dev_err(&spi->dev, "spi_sync(): %d\n", err);
>> + mutex_unlock(&data->lock);
>> + return err;
>> + }
>> + mutex_unlock(&data->lock);
>> +
>> + dev_dbg(&spi->dev, "mcp4131_exec: rx0: 0x%x rx1: 0x%x\n",
>> + data->rx[0], data->rx[1]);
>> +
>> + return 0;
>> +}
>> +
>> +static int mcp4131_read_raw(struct iio_dev *indio_dev,
>> + struct iio_chan_spec const *chan,
>> + int *val, int *val2, long mask)
>> +{
>> + int err;
>> + struct mcp4131_data *data = iio_priv(indio_dev);
>> + int address = chan->channel;
>> +
>> + switch (mask) {
>> + case IIO_CHAN_INFO_RAW:
>> + err = mcp4131_exec(data, address, MCP4131_READ, 0);
>> + if (err)
>> + return err;
>> +
>> + /* Error, bad address/command combination */
>> + if (!MCP4131_CMDERR(data->rx))
>> + return -EIO;
>> +
>> + *val = MCP4131_RAW(data->rx);
>> + return IIO_VAL_INT;
>> +
>> + case IIO_CHAN_INFO_SCALE:
Now I'd change the way you are doing this slightly so that you have
data->cfg pointing to mcp4131[data->devid]. Moves the 'what part am I?'
question to a single place in the probe function giving slightly cleaner code.
>> + *val = 1000 * mcp4131_cfg[data->devid].kohms;
>> + *val2 = mcp4131_cfg[data->devid].max_pos;
>> + return IIO_VAL_FRACTIONAL;
>> + }
>> +
>> + return -EINVAL;
>> +}
>> +
>> +static int mcp4131_write_raw(struct iio_dev *indio_dev,
>> + struct iio_chan_spec const *chan,
>> + int val, int val2, long mask)
>> +{
>> + struct mcp4131_data *data = iio_priv(indio_dev);
>> + int address = chan->channel << MCP4131_WIPER_SHIFT;
>> +
>> + switch (mask) {
>> + case IIO_CHAN_INFO_RAW:
>> + if (val > mcp4131_cfg[data->devid].max_pos || val < 0)
>> + return -EINVAL;
>> + break;
>> + default:
>> + return -EINVAL;
>> + }
>> +
>> + return mcp4131_exec(data, address, MCP4131_WRITE, val);
>> +}
>> +
>> +static const struct iio_info mcp4131_info = {
>> + .read_raw = mcp4131_read_raw,
>> + .write_raw = mcp4131_write_raw,
>> + .driver_module = THIS_MODULE,
>> +};
>> +
>> +static int mcp4131_probe(struct spi_device *spi)
>> +{
>> + int err;
>> + struct device *dev = &spi->dev;
>> + unsigned long devid = spi_get_device_id(spi)->driver_data;
>> + struct mcp4131_data *data;
>> + struct iio_dev *indio_dev;
>> +
>> + indio_dev = devm_iio_device_alloc(dev, sizeof(*data));
>> + if (!indio_dev)
>> + return -ENOMEM;
>> +
>> + data = iio_priv(indio_dev);
>> + spi_set_drvdata(spi, indio_dev);
>> + data->spi = spi;
>> + data->devid = devid;
>> +
>> + data->xfer.tx_buf = data->tx;
>> + data->xfer.rx_buf = data->rx;
>> +
>> + mutex_init(&data->lock);
>> +
>> + indio_dev->dev.parent = dev;
>> + indio_dev->info = &mcp4131_info;
>> + indio_dev->channels = mcp4131_channels;
>> + indio_dev->num_channels = mcp4131_cfg[devid].wipers;
>> + indio_dev->name = spi_get_device_id(spi)->name;
>> +
>> + err = devm_iio_device_register(dev, indio_dev);
>> + if (err) {
>> + dev_info(&spi->dev, "Unable to register %s\n", indio_dev->name);
>> + return err;
>> + }
>> +
>> + dev_info(&spi->dev, "Registered %s\n", indio_dev->name);
>
> I'd rather drop this message
Agreed, adds noise and it's easy to check if the register succeeded anyway
by just looking to see if the device is there in sysfs.
>
>> +
>> + return 0;
>> +}
>> +
>> +static int mcp4131_remove(struct spi_device *spi)
>> +{
>> + struct iio_dev *indio_dev = spi_get_drvdata(spi);
>> + struct mcp4131_data *data = iio_priv(indio_dev);
>> +
>> + mutex_destroy(&data->lock);
>
> no need to call
Hmm. This is an oddity, the mutex_destroy exists to aid in debugging locking
issues by explicity marking the mutex as do not use - iff the mutex
debugging is enabled. In this case the storage is promptly deleted anyway
so any attempt to use the mutex would result in a null pointer dereference
anyway. Hence probably not worth having it here.
>
>> + devm_iio_device_unregister(&spi->dev, indio_dev);
>
> don't call this explicitly, it is done automatically after _remove
>
>> +
>> + dev_info(&spi->dev, "Unregistered %s\n", indio_dev->name);
>
> don't
>
> I think the entire _remove can be removed
>
>> +
>> + return 0;
>> +}
>> +
>> +#if defined(CONFIG_OF)
>> +static const struct of_device_id mcp4131_dt_ids[] = {
>> + { .compatible = "microchip,mcp4131-502",
>> + .data = &mcp4131_cfg[MCP413x_502] },
>> + { .compatible = "microchip,mcp4131-103",
>> + .data = &mcp4131_cfg[MCP413x_103] },
>> + { .compatible = "microchip,mcp4131-503",
>> + .data = &mcp4131_cfg[MCP413x_503] },
>> + { .compatible = "microchip,mcp4131-104",
>> + .data = &mcp4131_cfg[MCP413x_104] },
>> + { .compatible = "microchip,mcp4132-502",
>> + .data = &mcp4131_cfg[MCP413x_502] },
>> + { .compatible = "microchip,mcp4132-103",
>> + .data = &mcp4131_cfg[MCP413x_103] },
>> + { .compatible = "microchip,mcp4132-503",
>> + .data = &mcp4131_cfg[MCP413x_503] },
>> + { .compatible = "microchip,mcp4132-104",
>> + .data = &mcp4131_cfg[MCP413x_104] },
>> + { .compatible = "microchip,mcp4141-502",
>> + .data = &mcp4131_cfg[MCP414x_502] },
>> + { .compatible = "microchip,mcp4141-103",
>> + .data = &mcp4131_cfg[MCP414x_103] },
>> + { .compatible = "microchip,mcp4141-503",
>> + .data = &mcp4131_cfg[MCP414x_503] },
>> + { .compatible = "microchip,mcp4141-104",
>> + .data = &mcp4131_cfg[MCP414x_104] },
>> + { .compatible = "microchip,mcp4142-502",
>> + .data = &mcp4131_cfg[MCP414x_502] },
>> + { .compatible = "microchip,mcp4142-103",
>> + .data = &mcp4131_cfg[MCP414x_103] },
>> + { .compatible = "microchip,mcp4142-503",
>> + .data = &mcp4131_cfg[MCP414x_503] },
>> + { .compatible = "microchip,mcp4142-104",
>> + .data = &mcp4131_cfg[MCP414x_104] },
>> + { .compatible = "microchip,mcp4151-502",
>> + .data = &mcp4131_cfg[MCP415x_502] },
>> + { .compatible = "microchip,mcp4151-103",
>> + .data = &mcp4131_cfg[MCP415x_103] },
>> + { .compatible = "microchip,mcp4151-503",
>> + .data = &mcp4131_cfg[MCP415x_503] },
>> + { .compatible = "microchip,mcp4151-104",
>> + .data = &mcp4131_cfg[MCP415x_104] },
>> + { .compatible = "microchip,mcp4152-502",
>> + .data = &mcp4131_cfg[MCP415x_502] },
>> + { .compatible = "microchip,mcp4152-103",
>> + .data = &mcp4131_cfg[MCP415x_103] },
>> + { .compatible = "microchip,mcp4152-503",
>> + .data = &mcp4131_cfg[MCP415x_503] },
>> + { .compatible = "microchip,mcp4152-104",
>> + .data = &mcp4131_cfg[MCP415x_104] },
>> + { .compatible = "microchip,mcp4161-502",
>> + .data = &mcp4131_cfg[MCP416x_502] },
>> + { .compatible = "microchip,mcp4161-103",
>> + .data = &mcp4131_cfg[MCP416x_103] },
>> + { .compatible = "microchip,mcp4161-503",
>> + .data = &mcp4131_cfg[MCP416x_503] },
>> + { .compatible = "microchip,mcp4161-104",
>> + .data = &mcp4131_cfg[MCP416x_104] },
>> + { .compatible = "microchip,mcp4162-502",
>> + .data = &mcp4131_cfg[MCP416x_502] },
>> + { .compatible = "microchip,mcp4162-103",
>> + .data = &mcp4131_cfg[MCP416x_103] },
>> + { .compatible = "microchip,mcp4162-503",
>> + .data = &mcp4131_cfg[MCP416x_503] },
>> + { .compatible = "microchip,mcp4162-104",
>> + .data = &mcp4131_cfg[MCP416x_104] },
>> + { .compatible = "microchip,mcp4231-502",
>> + .data = &mcp4131_cfg[MCP423x_502] },
>> + { .compatible = "microchip,mcp4231-103",
>> + .data = &mcp4131_cfg[MCP423x_103] },
>> + { .compatible = "microchip,mcp4231-503",
>> + .data = &mcp4131_cfg[MCP423x_503] },
>> + { .compatible = "microchip,mcp4231-104",
>> + .data = &mcp4131_cfg[MCP423x_104] },
>> + { .compatible = "microchip,mcp4232-502",
>> + .data = &mcp4131_cfg[MCP423x_502] },
>> + { .compatible = "microchip,mcp4232-103",
>> + .data = &mcp4131_cfg[MCP423x_103] },
>> + { .compatible = "microchip,mcp4232-503",
>> + .data = &mcp4131_cfg[MCP423x_503] },
>> + { .compatible = "microchip,mcp4232-104",
>> + .data = &mcp4131_cfg[MCP423x_104] },
>> + { .compatible = "microchip,mcp4241-502",
>> + .data = &mcp4131_cfg[MCP424x_502] },
>> + { .compatible = "microchip,mcp4241-103",
>> + .data = &mcp4131_cfg[MCP424x_103] },
>> + { .compatible = "microchip,mcp4241-503",
>> + .data = &mcp4131_cfg[MCP424x_503] },
>> + { .compatible = "microchip,mcp4241-104",
>> + .data = &mcp4131_cfg[MCP424x_104] },
>> + { .compatible = "microchip,mcp4242-502",
>> + .data = &mcp4131_cfg[MCP424x_502] },
>> + { .compatible = "microchip,mcp4242-103",
>> + .data = &mcp4131_cfg[MCP424x_103] },
>> + { .compatible = "microchip,mcp4242-503",
>> + .data = &mcp4131_cfg[MCP424x_503] },
>> + { .compatible = "microchip,mcp4242-104",
>> + .data = &mcp4131_cfg[MCP424x_104] },
>> + { .compatible = "microchip,mcp4251-502",
>> + .data = &mcp4131_cfg[MCP425x_502] },
>> + { .compatible = "microchip,mcp4251-103",
>> + .data = &mcp4131_cfg[MCP425x_103] },
>> + { .compatible = "microchip,mcp4251-503",
>> + .data = &mcp4131_cfg[MCP425x_503] },
>> + { .compatible = "microchip,mcp4251-104",
>> + .data = &mcp4131_cfg[MCP425x_104] },
>> + { .compatible = "microchip,mcp4252-502",
>> + .data = &mcp4131_cfg[MCP425x_502] },
>> + { .compatible = "microchip,mcp4252-103",
>> + .data = &mcp4131_cfg[MCP425x_103] },
>> + { .compatible = "microchip,mcp4252-503",
>> + .data = &mcp4131_cfg[MCP425x_503] },
>> + { .compatible = "microchip,mcp4252-104",
>> + .data = &mcp4131_cfg[MCP425x_104] },
>> + { .compatible = "microchip,mcp4261-502",
>> + .data = &mcp4131_cfg[MCP426x_502] },
>> + { .compatible = "microchip,mcp4261-103",
>> + .data = &mcp4131_cfg[MCP426x_103] },
>> + { .compatible = "microchip,mcp4261-503",
>> + .data = &mcp4131_cfg[MCP426x_503] },
>> + { .compatible = "microchip,mcp4261-104",
>> + .data = &mcp4131_cfg[MCP426x_104] },
>> + { .compatible = "microchip,mcp4262-502",
>> + .data = &mcp4131_cfg[MCP426x_502] },
>> + { .compatible = "microchip,mcp4262-103",
>> + .data = &mcp4131_cfg[MCP426x_103] },
>> + { .compatible = "microchip,mcp4262-503",
>> + .data = &mcp4131_cfg[MCP426x_503] },
>> + { .compatible = "microchip,mcp4262-104",
>> + .data = &mcp4131_cfg[MCP426x_104] },
>> + {}
>> +};
>> +MODULE_DEVICE_TABLE(of, mcp4131_dt_ids);
>> +#endif /* CONFIG_OF */
>> +
>> +static const struct spi_device_id mcp4131_id[] = {
>> + { "mcp4131-502", MCP413x_502 },
>> + { "mcp4131-103", MCP413x_103 },
>> + { "mcp4131-503", MCP413x_503 },
>> + { "mcp4131-104", MCP413x_104 },
>> + { "mcp4132-502", MCP413x_502 },
>> + { "mcp4132-103", MCP413x_103 },
>> + { "mcp4132-503", MCP413x_503 },
>> + { "mcp4132-104", MCP413x_104 },
>> + { "mcp4141-502", MCP414x_502 },
>> + { "mcp4141-103", MCP414x_103 },
>> + { "mcp4141-503", MCP414x_503 },
>> + { "mcp4141-104", MCP414x_104 },
>> + { "mcp4142-502", MCP414x_502 },
>> + { "mcp4142-103", MCP414x_103 },
>> + { "mcp4142-503", MCP414x_503 },
>> + { "mcp4142-104", MCP414x_104 },
>> + { "mcp4151-502", MCP415x_502 },
>> + { "mcp4151-103", MCP415x_103 },
>> + { "mcp4151-503", MCP415x_503 },
>> + { "mcp4151-104", MCP415x_104 },
>> + { "mcp4152-502", MCP415x_502 },
>> + { "mcp4152-103", MCP415x_103 },
>> + { "mcp4152-503", MCP415x_503 },
>> + { "mcp4152-104", MCP415x_104 },
>> + { "mcp4161-502", MCP416x_502 },
>> + { "mcp4161-103", MCP416x_103 },
>> + { "mcp4161-503", MCP416x_503 },
>> + { "mcp4161-104", MCP416x_104 },
>> + { "mcp4162-502", MCP416x_502 },
>> + { "mcp4162-103", MCP416x_103 },
>> + { "mcp4162-503", MCP416x_503 },
>> + { "mcp4162-104", MCP416x_104 },
>> + { "mcp4231-502", MCP423x_502 },
>> + { "mcp4231-103", MCP423x_103 },
>> + { "mcp4231-503", MCP423x_503 },
>> + { "mcp4231-104", MCP423x_104 },
>> + { "mcp4232-502", MCP423x_502 },
>> + { "mcp4232-103", MCP423x_103 },
>> + { "mcp4232-503", MCP423x_503 },
>> + { "mcp4232-104", MCP423x_104 },
>> + { "mcp4241-502", MCP424x_502 },
>> + { "mcp4241-103", MCP424x_103 },
>> + { "mcp4241-503", MCP424x_503 },
>> + { "mcp4241-104", MCP424x_104 },
>> + { "mcp4242-502", MCP424x_502 },
>> + { "mcp4242-103", MCP424x_103 },
>> + { "mcp4242-503", MCP424x_503 },
>> + { "mcp4242-104", MCP424x_104 },
>> + { "mcp4251-502", MCP425x_502 },
>> + { "mcp4251-103", MCP425x_103 },
>> + { "mcp4251-503", MCP425x_503 },
>> + { "mcp4251-104", MCP425x_104 },
>> + { "mcp4252-502", MCP425x_502 },
>> + { "mcp4252-103", MCP425x_103 },
>> + { "mcp4252-503", MCP425x_503 },
>> + { "mcp4252-104", MCP425x_104 },
>> + { "mcp4261-502", MCP426x_502 },
>> + { "mcp4261-103", MCP426x_103 },
>> + { "mcp4261-503", MCP426x_503 },
>> + { "mcp4261-104", MCP426x_104 },
>> + { "mcp4262-502", MCP426x_502 },
>> + { "mcp4262-103", MCP426x_103 },
>> + { "mcp4262-503", MCP426x_503 },
>> + { "mcp4262-104", MCP426x_104 },
>> + {}
>> +};
>> +MODULE_DEVICE_TABLE(spi, mcp4131_id);
>> +
>> +static struct spi_driver mcp4131_driver = {
>> + .driver = {
>> + .name = "mcp4131",
>> + .of_match_table = of_match_ptr(mcp4131_dt_ids),
>> + },
>> + .probe = mcp4131_probe,
>> + .remove = mcp4131_remove,
>> + .id_table = mcp4131_id,
>> +};
>> +
>> +module_spi_driver(mcp4131_driver);
>> +
>> +MODULE_AUTHOR("Slawomir Stepien <sst@...zta.fm>");
>> +MODULE_DESCRIPTION("MCP4131 digital potentiometer");
>> +MODULE_LICENSE("GPL v2");
>>
>
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