![Hartmut Knaack](/assets/img/avatar_default.png)
Some adjustment of indentation to make checkpatch.pl happy in strict mode. Signed-off-by: Hartmut Knaack <knaack.h@gmx.de> Acked-by: Antoine Tenart <antoine.tenart@free-electrons.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
382 lines
10 KiB
C
382 lines
10 KiB
C
/*
|
|
* 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/module.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_update_bits(priv->regmap, BERLIN2_SM_ADC_STATUS,
|
|
BERLIN2_SM_ADC_STATUS_INT_EN(channel), 0);
|
|
|
|
if (ret == 0)
|
|
ret = -ETIMEDOUT;
|
|
if (ret < 0) {
|
|
mutex_unlock(&priv->lock);
|
|
return ret;
|
|
}
|
|
|
|
regmap_update_bits(priv->regmap, BERLIN2_SM_CTRL,
|
|
BERLIN2_SM_CTRL_ADC_START, 0);
|
|
|
|
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_update_bits(priv->regmap, BERLIN2_SM_TSEN_STATUS,
|
|
BERLIN2_SM_TSEN_STATUS_INT_EN, 0);
|
|
|
|
if (ret == 0)
|
|
ret = -ETIMEDOUT;
|
|
if (ret < 0) {
|
|
mutex_unlock(&priv->lock);
|
|
return ret;
|
|
}
|
|
|
|
regmap_update_bits(priv->regmap, BERLIN2_SM_TSEN_CTRL,
|
|
BERLIN2_SM_TSEN_CTRL_START, 0);
|
|
|
|
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 = {
|
|
.driver_module = THIS_MODULE,
|
|
.read_raw = berlin2_adc_read_raw,
|
|
};
|
|
|
|
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)
|
|
return -ENOMEM;
|
|
|
|
priv = iio_priv(indio_dev);
|
|
platform_set_drvdata(pdev, 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->dev.parent = &pdev->dev;
|
|
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_update_bits(priv->regmap, BERLIN2_SM_CTRL,
|
|
BERLIN2_SM_CTRL_ADC_POWER,
|
|
BERLIN2_SM_CTRL_ADC_POWER);
|
|
|
|
ret = iio_device_register(indio_dev);
|
|
if (ret) {
|
|
/* Power down the ADC */
|
|
regmap_update_bits(priv->regmap, BERLIN2_SM_CTRL,
|
|
BERLIN2_SM_CTRL_ADC_POWER, 0);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int berlin2_adc_remove(struct platform_device *pdev)
|
|
{
|
|
struct iio_dev *indio_dev = platform_get_drvdata(pdev);
|
|
struct berlin2_adc_priv *priv = iio_priv(indio_dev);
|
|
|
|
iio_device_unregister(indio_dev);
|
|
|
|
/* Power down the ADC */
|
|
regmap_update_bits(priv->regmap, BERLIN2_SM_CTRL,
|
|
BERLIN2_SM_CTRL_ADC_POWER, 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
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,
|
|
.remove = berlin2_adc_remove,
|
|
};
|
|
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");
|