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linux/drivers/iio/adc/berlin2-adc.c
Jonathan Cameron 09e3bdfe49 iio: adc: standardize on formatting for id match tables 
This is a frequent minor comment in reviews, so start cleaning up
existing drivers in the hope we get fewer cases of cut and paste.

There are not kernel wide rules for these, but for IIO the style
that I prefer (and hence most common) is:

- Space after { and before }
- No comma after terminator { }

This may cause merge conflicts but they should be trivial to resolve
hence I have not broken this into per driver patches.

Link: https://patch.msgid.link/20240818180912.719399-1-jic23@kernel.org
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2024-09-05 19:27:13 +01:00

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/*
* Marvell Berlin2 ADC driver
*
* Copyright (C) 2015 Marvell Technology Group Ltd.
*
* Antoine Tenart <antoine.tenart@free-electrons.com>
*
* This file is licensed under the terms of the GNU General Public
* License version 2. This program is licensed "as is" without any
* warranty of any kind, whether express or implied.
*/
#include <linux/iio/iio.h>
#include <linux/iio/driver.h>
#include <linux/iio/machine.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <linux/mfd/syscon.h>
#include <linux/regmap.h>
#include <linux/sched.h>
#include <linux/wait.h>
#define BERLIN2_SM_CTRL 0x14
#define BERLIN2_SM_CTRL_SM_SOC_INT BIT(1)
#define BERLIN2_SM_CTRL_SOC_SM_INT BIT(2)
#define BERLIN2_SM_CTRL_ADC_SEL(x) ((x) << 5) /* 0-15 */
#define BERLIN2_SM_CTRL_ADC_SEL_MASK GENMASK(8, 5)
#define BERLIN2_SM_CTRL_ADC_POWER BIT(9)
#define BERLIN2_SM_CTRL_ADC_CLKSEL_DIV2 (0x0 << 10)
#define BERLIN2_SM_CTRL_ADC_CLKSEL_DIV3 (0x1 << 10)
#define BERLIN2_SM_CTRL_ADC_CLKSEL_DIV4 (0x2 << 10)
#define BERLIN2_SM_CTRL_ADC_CLKSEL_DIV8 (0x3 << 10)
#define BERLIN2_SM_CTRL_ADC_CLKSEL_MASK GENMASK(11, 10)
#define BERLIN2_SM_CTRL_ADC_START BIT(12)
#define BERLIN2_SM_CTRL_ADC_RESET BIT(13)
#define BERLIN2_SM_CTRL_ADC_BANDGAP_RDY BIT(14)
#define BERLIN2_SM_CTRL_ADC_CONT_SINGLE (0x0 << 15)
#define BERLIN2_SM_CTRL_ADC_CONT_CONTINUOUS (0x1 << 15)
#define BERLIN2_SM_CTRL_ADC_BUFFER_EN BIT(16)
#define BERLIN2_SM_CTRL_ADC_VREF_EXT (0x0 << 17)
#define BERLIN2_SM_CTRL_ADC_VREF_INT (0x1 << 17)
#define BERLIN2_SM_CTRL_ADC_ROTATE BIT(19)
#define BERLIN2_SM_CTRL_TSEN_EN BIT(20)
#define BERLIN2_SM_CTRL_TSEN_CLK_SEL_125 (0x0 << 21) /* 1.25 MHz */
#define BERLIN2_SM_CTRL_TSEN_CLK_SEL_250 (0x1 << 21) /* 2.5 MHz */
#define BERLIN2_SM_CTRL_TSEN_MODE_0_125 (0x0 << 22) /* 0-125 C */
#define BERLIN2_SM_CTRL_TSEN_MODE_10_50 (0x1 << 22) /* 10-50 C */
#define BERLIN2_SM_CTRL_TSEN_RESET BIT(29)
#define BERLIN2_SM_ADC_DATA 0x20
#define BERLIN2_SM_ADC_MASK GENMASK(9, 0)
#define BERLIN2_SM_ADC_STATUS 0x1c
#define BERLIN2_SM_ADC_STATUS_DATA_RDY(x) BIT(x) /* 0-15 */
#define BERLIN2_SM_ADC_STATUS_DATA_RDY_MASK GENMASK(15, 0)
#define BERLIN2_SM_ADC_STATUS_INT_EN(x) (BIT(x) << 16) /* 0-15 */
#define BERLIN2_SM_ADC_STATUS_INT_EN_MASK GENMASK(31, 16)
#define BERLIN2_SM_TSEN_STATUS 0x24
#define BERLIN2_SM_TSEN_STATUS_DATA_RDY BIT(0)
#define BERLIN2_SM_TSEN_STATUS_INT_EN BIT(1)
#define BERLIN2_SM_TSEN_DATA 0x28
#define BERLIN2_SM_TSEN_MASK GENMASK(9, 0)
#define BERLIN2_SM_TSEN_CTRL 0x74
#define BERLIN2_SM_TSEN_CTRL_START BIT(8)
#define BERLIN2_SM_TSEN_CTRL_SETTLING_4 (0x0 << 21) /* 4 us */
#define BERLIN2_SM_TSEN_CTRL_SETTLING_12 (0x1 << 21) /* 12 us */
#define BERLIN2_SM_TSEN_CTRL_SETTLING_MASK BIT(21)
#define BERLIN2_SM_TSEN_CTRL_TRIM(x) ((x) << 22)
#define BERLIN2_SM_TSEN_CTRL_TRIM_MASK GENMASK(25, 22)
struct berlin2_adc_priv {
struct regmap *regmap;
struct mutex lock;
wait_queue_head_t wq;
bool data_available;
int data;
};
#define BERLIN2_ADC_CHANNEL(n, t) \
{ \
.channel = n, \
.datasheet_name = "channel"#n, \
.type = t, \
.indexed = 1, \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
}
static const struct iio_chan_spec berlin2_adc_channels[] = {
BERLIN2_ADC_CHANNEL(0, IIO_VOLTAGE), /* external input */
BERLIN2_ADC_CHANNEL(1, IIO_VOLTAGE), /* external input */
BERLIN2_ADC_CHANNEL(2, IIO_VOLTAGE), /* external input */
BERLIN2_ADC_CHANNEL(3, IIO_VOLTAGE), /* external input */
BERLIN2_ADC_CHANNEL(4, IIO_VOLTAGE), /* reserved */
BERLIN2_ADC_CHANNEL(5, IIO_VOLTAGE), /* reserved */
{ /* temperature sensor */
.channel = 6,
.datasheet_name = "channel6",
.type = IIO_TEMP,
.indexed = 0,
.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
},
BERLIN2_ADC_CHANNEL(7, IIO_VOLTAGE), /* reserved */
IIO_CHAN_SOFT_TIMESTAMP(8), /* timestamp */
};
static int berlin2_adc_read(struct iio_dev *indio_dev, int channel)
{
struct berlin2_adc_priv *priv = iio_priv(indio_dev);
int data, ret;
mutex_lock(&priv->lock);
/* Enable the interrupts */
regmap_write(priv->regmap, BERLIN2_SM_ADC_STATUS,
BERLIN2_SM_ADC_STATUS_INT_EN(channel));
/* Configure the ADC */
regmap_update_bits(priv->regmap, BERLIN2_SM_CTRL,
BERLIN2_SM_CTRL_ADC_RESET |
BERLIN2_SM_CTRL_ADC_SEL_MASK |
BERLIN2_SM_CTRL_ADC_START,
BERLIN2_SM_CTRL_ADC_SEL(channel) |
BERLIN2_SM_CTRL_ADC_START);
ret = wait_event_interruptible_timeout(priv->wq, priv->data_available,
msecs_to_jiffies(1000));
/* Disable the interrupts */
regmap_clear_bits(priv->regmap, BERLIN2_SM_ADC_STATUS,
BERLIN2_SM_ADC_STATUS_INT_EN(channel));
if (ret == 0)
ret = -ETIMEDOUT;
if (ret < 0) {
mutex_unlock(&priv->lock);
return ret;
}
regmap_clear_bits(priv->regmap, BERLIN2_SM_CTRL,
BERLIN2_SM_CTRL_ADC_START);
data = priv->data;
priv->data_available = false;
mutex_unlock(&priv->lock);
return data;
}
static int berlin2_adc_tsen_read(struct iio_dev *indio_dev)
{
struct berlin2_adc_priv *priv = iio_priv(indio_dev);
int data, ret;
mutex_lock(&priv->lock);
/* Enable interrupts */
regmap_write(priv->regmap, BERLIN2_SM_TSEN_STATUS,
BERLIN2_SM_TSEN_STATUS_INT_EN);
/* Configure the ADC */
regmap_update_bits(priv->regmap, BERLIN2_SM_CTRL,
BERLIN2_SM_CTRL_TSEN_RESET |
BERLIN2_SM_CTRL_ADC_ROTATE,
BERLIN2_SM_CTRL_ADC_ROTATE);
/* Configure the temperature sensor */
regmap_update_bits(priv->regmap, BERLIN2_SM_TSEN_CTRL,
BERLIN2_SM_TSEN_CTRL_TRIM_MASK |
BERLIN2_SM_TSEN_CTRL_SETTLING_MASK |
BERLIN2_SM_TSEN_CTRL_START,
BERLIN2_SM_TSEN_CTRL_TRIM(3) |
BERLIN2_SM_TSEN_CTRL_SETTLING_12 |
BERLIN2_SM_TSEN_CTRL_START);
ret = wait_event_interruptible_timeout(priv->wq, priv->data_available,
msecs_to_jiffies(1000));
/* Disable interrupts */
regmap_clear_bits(priv->regmap, BERLIN2_SM_TSEN_STATUS,
BERLIN2_SM_TSEN_STATUS_INT_EN);
if (ret == 0)
ret = -ETIMEDOUT;
if (ret < 0) {
mutex_unlock(&priv->lock);
return ret;
}
regmap_clear_bits(priv->regmap, BERLIN2_SM_TSEN_CTRL,
BERLIN2_SM_TSEN_CTRL_START);
data = priv->data;
priv->data_available = false;
mutex_unlock(&priv->lock);
return data;
}
static int berlin2_adc_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan, int *val,
int *val2, long mask)
{
int temp;
switch (mask) {
case IIO_CHAN_INFO_RAW:
if (chan->type != IIO_VOLTAGE)
return -EINVAL;
*val = berlin2_adc_read(indio_dev, chan->channel);
if (*val < 0)
return *val;
return IIO_VAL_INT;
case IIO_CHAN_INFO_PROCESSED:
if (chan->type != IIO_TEMP)
return -EINVAL;
temp = berlin2_adc_tsen_read(indio_dev);
if (temp < 0)
return temp;
if (temp > 2047)
temp -= 4096;
/* Convert to milli Celsius */
*val = ((temp * 100000) / 264 - 270000);
return IIO_VAL_INT;
default:
break;
}
return -EINVAL;
}
static irqreturn_t berlin2_adc_irq(int irq, void *private)
{
struct berlin2_adc_priv *priv = iio_priv(private);
unsigned val;
regmap_read(priv->regmap, BERLIN2_SM_ADC_STATUS, &val);
if (val & BERLIN2_SM_ADC_STATUS_DATA_RDY_MASK) {
regmap_read(priv->regmap, BERLIN2_SM_ADC_DATA, &priv->data);
priv->data &= BERLIN2_SM_ADC_MASK;
val &= ~BERLIN2_SM_ADC_STATUS_DATA_RDY_MASK;
regmap_write(priv->regmap, BERLIN2_SM_ADC_STATUS, val);
priv->data_available = true;
wake_up_interruptible(&priv->wq);
}
return IRQ_HANDLED;
}
static irqreturn_t berlin2_adc_tsen_irq(int irq, void *private)
{
struct berlin2_adc_priv *priv = iio_priv(private);
unsigned val;
regmap_read(priv->regmap, BERLIN2_SM_TSEN_STATUS, &val);
if (val & BERLIN2_SM_TSEN_STATUS_DATA_RDY) {
regmap_read(priv->regmap, BERLIN2_SM_TSEN_DATA, &priv->data);
priv->data &= BERLIN2_SM_TSEN_MASK;
val &= ~BERLIN2_SM_TSEN_STATUS_DATA_RDY;
regmap_write(priv->regmap, BERLIN2_SM_TSEN_STATUS, val);
priv->data_available = true;
wake_up_interruptible(&priv->wq);
}
return IRQ_HANDLED;
}
static const struct iio_info berlin2_adc_info = {
.read_raw = berlin2_adc_read_raw,
};
static void berlin2_adc_powerdown(void *regmap)
{
regmap_clear_bits(regmap, BERLIN2_SM_CTRL, BERLIN2_SM_CTRL_ADC_POWER);
}
static int berlin2_adc_probe(struct platform_device *pdev)
{
struct iio_dev *indio_dev;
struct berlin2_adc_priv *priv;
struct device_node *parent_np = of_get_parent(pdev->dev.of_node);
int irq, tsen_irq;
int ret;
indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*priv));
if (!indio_dev) {
of_node_put(parent_np);
return -ENOMEM;
}
priv = iio_priv(indio_dev);
priv->regmap = syscon_node_to_regmap(parent_np);
of_node_put(parent_np);
if (IS_ERR(priv->regmap))
return PTR_ERR(priv->regmap);
irq = platform_get_irq_byname(pdev, "adc");
if (irq < 0)
return irq;
tsen_irq = platform_get_irq_byname(pdev, "tsen");
if (tsen_irq < 0)
return tsen_irq;
ret = devm_request_irq(&pdev->dev, irq, berlin2_adc_irq, 0,
pdev->dev.driver->name, indio_dev);
if (ret)
return ret;
ret = devm_request_irq(&pdev->dev, tsen_irq, berlin2_adc_tsen_irq,
0, pdev->dev.driver->name, indio_dev);
if (ret)
return ret;
init_waitqueue_head(&priv->wq);
mutex_init(&priv->lock);
indio_dev->name = dev_name(&pdev->dev);
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->info = &berlin2_adc_info;
indio_dev->channels = berlin2_adc_channels;
indio_dev->num_channels = ARRAY_SIZE(berlin2_adc_channels);
/* Power up the ADC */
regmap_set_bits(priv->regmap, BERLIN2_SM_CTRL,
BERLIN2_SM_CTRL_ADC_POWER);
ret = devm_add_action_or_reset(&pdev->dev, berlin2_adc_powerdown,
priv->regmap);
if (ret)
return ret;
return devm_iio_device_register(&pdev->dev, indio_dev);
}
static const struct of_device_id berlin2_adc_match[] = {
{ .compatible = "marvell,berlin2-adc", },
{ }
};
MODULE_DEVICE_TABLE(of, berlin2_adc_match);
static struct platform_driver berlin2_adc_driver = {
.driver = {
.name = "berlin2-adc",
.of_match_table = berlin2_adc_match,
},
.probe = berlin2_adc_probe,
};
module_platform_driver(berlin2_adc_driver);
MODULE_AUTHOR("Antoine Tenart <antoine.tenart@free-electrons.com>");
MODULE_DESCRIPTION("Marvell Berlin2 ADC driver");
MODULE_LICENSE("GPL v2");
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