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iio: chemical: atlas-ph-sensor: reorg driver to allow multiple chips
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Signed-off-by: Matt Ranostay <[email protected]>
Signed-off-by: Jonathan Cameron <[email protected]>
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@mranostay @jic23
mranostay authored and jic23 committed May 29, 2016
1 parent 5d48d6b commit 7103b99
Showing 1 changed file with 90 additions and 55 deletions.
145 changes: 90 additions & 55 deletions drivers/iio/chemical/atlas-ph-sensor.c
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Original file line number Diff line number Diff line change
Expand Up @@ -24,6 +24,7 @@
#include <linux/irq_work.h>
#include <linux/gpio.h>
#include <linux/i2c.h>
#include <linux/of_device.h>
#include <linux/regmap.h>
#include <linux/iio/iio.h>
#include <linux/iio/buffer.h>
Expand All @@ -43,20 +44,25 @@

#define ATLAS_REG_PWR_CONTROL 0x06

#define ATLAS_REG_CALIB_STATUS 0x0d
#define ATLAS_REG_CALIB_STATUS_MASK 0x07
#define ATLAS_REG_CALIB_STATUS_LOW BIT(0)
#define ATLAS_REG_CALIB_STATUS_MID BIT(1)
#define ATLAS_REG_CALIB_STATUS_HIGH BIT(2)
#define ATLAS_REG_PH_CALIB_STATUS 0x0d
#define ATLAS_REG_PH_CALIB_STATUS_MASK 0x07
#define ATLAS_REG_PH_CALIB_STATUS_LOW BIT(0)
#define ATLAS_REG_PH_CALIB_STATUS_MID BIT(1)
#define ATLAS_REG_PH_CALIB_STATUS_HIGH BIT(2)

#define ATLAS_REG_TEMP_DATA 0x0e
#define ATLAS_REG_PH_TEMP_DATA 0x0e
#define ATLAS_REG_PH_DATA 0x16

#define ATLAS_PH_INT_TIME_IN_US 450000

enum {
ATLAS_PH_SM,
};

struct atlas_data {
struct i2c_client *client;
struct iio_trigger *trig;
struct atlas_device *chip;
struct regmap *regmap;
struct irq_work work;

Expand Down Expand Up @@ -84,9 +90,10 @@ static const struct regmap_config atlas_regmap_config = {
.cache_type = REGCACHE_RBTREE,
};

static const struct iio_chan_spec atlas_channels[] = {
static const struct iio_chan_spec atlas_ph_channels[] = {
{
.type = IIO_PH,
.address = ATLAS_REG_PH_DATA,
.info_mask_separate =
BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
.scan_index = 0,
Expand All @@ -100,14 +107,60 @@ static const struct iio_chan_spec atlas_channels[] = {
IIO_CHAN_SOFT_TIMESTAMP(1),
{
.type = IIO_TEMP,
.address = ATLAS_REG_TEMP_DATA,
.address = ATLAS_REG_PH_TEMP_DATA,
.info_mask_separate =
BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
.output = 1,
.scan_index = -1
},
};

static int atlas_check_ph_calibration(struct atlas_data *data)
{
struct device *dev = &data->client->dev;
int ret;
unsigned int val;

ret = regmap_read(data->regmap, ATLAS_REG_PH_CALIB_STATUS, &val);
if (ret)
return ret;

if (!(val & ATLAS_REG_PH_CALIB_STATUS_MASK)) {
dev_warn(dev, "device has not been calibrated\n");
return 0;
}

if (!(val & ATLAS_REG_PH_CALIB_STATUS_LOW))
dev_warn(dev, "device missing low point calibration\n");

if (!(val & ATLAS_REG_PH_CALIB_STATUS_MID))
dev_warn(dev, "device missing mid point calibration\n");

if (!(val & ATLAS_REG_PH_CALIB_STATUS_HIGH))
dev_warn(dev, "device missing high point calibration\n");

return 0;
}

struct atlas_device {
const struct iio_chan_spec *channels;
int num_channels;
int data_reg;

int (*calibration)(struct atlas_data *data);
int delay;
};

static struct atlas_device atlas_devices[] = {
[ATLAS_PH_SM] = {
.channels = atlas_ph_channels,
.num_channels = 3,
.data_reg = ATLAS_REG_PH_DATA,
.calibration = &atlas_check_ph_calibration,
.delay = ATLAS_PH_INT_TIME_IN_US,
},
};

static int atlas_set_powermode(struct atlas_data *data, int on)
{
return regmap_write(data->regmap, ATLAS_REG_PWR_CONTROL, on);
Expand Down Expand Up @@ -178,8 +231,9 @@ static irqreturn_t atlas_trigger_handler(int irq, void *private)
struct atlas_data *data = iio_priv(indio_dev);
int ret;

ret = regmap_bulk_read(data->regmap, ATLAS_REG_PH_DATA,
(u8 *) &data->buffer, sizeof(data->buffer[0]));
ret = regmap_bulk_read(data->regmap, data->chip->data_reg,
(u8 *) &data->buffer,
sizeof(__be32) * (data->chip->num_channels - 2));

if (!ret)
iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
Expand All @@ -200,7 +254,7 @@ static irqreturn_t atlas_interrupt_handler(int irq, void *private)
return IRQ_HANDLED;
}

static int atlas_read_ph_measurement(struct atlas_data *data, __be32 *val)
static int atlas_read_measurement(struct atlas_data *data, int reg, __be32 *val)
{
struct device *dev = &data->client->dev;
int suspended = pm_runtime_suspended(dev);
Expand All @@ -213,11 +267,9 @@ static int atlas_read_ph_measurement(struct atlas_data *data, __be32 *val)
}

if (suspended)
usleep_range(ATLAS_PH_INT_TIME_IN_US,
ATLAS_PH_INT_TIME_IN_US + 100000);
usleep_range(data->chip->delay, data->chip->delay + 100000);

ret = regmap_bulk_read(data->regmap, ATLAS_REG_PH_DATA,
(u8 *) val, sizeof(*val));
ret = regmap_bulk_read(data->regmap, reg, (u8 *) val, sizeof(*val));

pm_runtime_mark_last_busy(dev);
pm_runtime_put_autosuspend(dev);
Expand Down Expand Up @@ -247,7 +299,8 @@ static int atlas_read_raw(struct iio_dev *indio_dev,
if (iio_buffer_enabled(indio_dev))
ret = -EBUSY;
else
ret = atlas_read_ph_measurement(data, &reg);
ret = atlas_read_measurement(data,
chan->address, &reg);

mutex_unlock(&indio_dev->mlock);
break;
Expand Down Expand Up @@ -303,37 +356,24 @@ static const struct iio_info atlas_info = {
.write_raw = atlas_write_raw,
};

static int atlas_check_calibration(struct atlas_data *data)
{
struct device *dev = &data->client->dev;
int ret;
unsigned int val;

ret = regmap_read(data->regmap, ATLAS_REG_CALIB_STATUS, &val);
if (ret)
return ret;

if (!(val & ATLAS_REG_CALIB_STATUS_MASK)) {
dev_warn(dev, "device has not been calibrated\n");
return 0;
}

if (!(val & ATLAS_REG_CALIB_STATUS_LOW))
dev_warn(dev, "device missing low point calibration\n");

if (!(val & ATLAS_REG_CALIB_STATUS_MID))
dev_warn(dev, "device missing mid point calibration\n");

if (!(val & ATLAS_REG_CALIB_STATUS_HIGH))
dev_warn(dev, "device missing high point calibration\n");
static const struct i2c_device_id atlas_id[] = {
{ "atlas-ph-sm", ATLAS_PH_SM},
{}
};
MODULE_DEVICE_TABLE(i2c, atlas_id);

return 0;
static const struct of_device_id atlas_dt_ids[] = {
{ .compatible = "atlas,ph-sm", .data = (void *)ATLAS_PH_SM, },
{ }
};
MODULE_DEVICE_TABLE(of, atlas_dt_ids);

static int atlas_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct atlas_data *data;
struct atlas_device *chip;
const struct of_device_id *of_id;
struct iio_trigger *trig;
struct iio_dev *indio_dev;
int ret;
Expand All @@ -342,10 +382,16 @@ static int atlas_probe(struct i2c_client *client,
if (!indio_dev)
return -ENOMEM;

of_id = of_match_device(atlas_dt_ids, &client->dev);
if (!of_id)
chip = &atlas_devices[id->driver_data];
else
chip = &atlas_devices[(unsigned long)of_id->data];

indio_dev->info = &atlas_info;
indio_dev->name = ATLAS_DRV_NAME;
indio_dev->channels = atlas_channels;
indio_dev->num_channels = ARRAY_SIZE(atlas_channels);
indio_dev->channels = chip->channels;
indio_dev->num_channels = chip->num_channels;
indio_dev->modes = INDIO_BUFFER_SOFTWARE | INDIO_DIRECT_MODE;
indio_dev->dev.parent = &client->dev;

Expand All @@ -358,6 +404,7 @@ static int atlas_probe(struct i2c_client *client,
data = iio_priv(indio_dev);
data->client = client;
data->trig = trig;
data->chip = chip;
trig->dev.parent = indio_dev->dev.parent;
trig->ops = &atlas_interrupt_trigger_ops;
iio_trigger_set_drvdata(trig, indio_dev);
Expand All @@ -379,7 +426,7 @@ static int atlas_probe(struct i2c_client *client,
return -EINVAL;
}

ret = atlas_check_calibration(data);
ret = chip->calibration(data);
if (ret)
return ret;

Expand Down Expand Up @@ -480,18 +527,6 @@ static const struct dev_pm_ops atlas_pm_ops = {
atlas_runtime_resume, NULL)
};

static const struct i2c_device_id atlas_id[] = {
{ "atlas-ph-sm", 0 },
{}
};
MODULE_DEVICE_TABLE(i2c, atlas_id);

static const struct of_device_id atlas_dt_ids[] = {
{ .compatible = "atlas,ph-sm" },
{ }
};
MODULE_DEVICE_TABLE(of, atlas_dt_ids);

static struct i2c_driver atlas_driver = {
.driver = {
.name = ATLAS_DRV_NAME,
Expand Down

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