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iio: magnetometer: mag3110: Add ability to run in continuous mode
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Adds the ability to run the Mag3110 in continuous mode to speed up the
sampling rate.
Depending on the sampling rate requested the device can be put in or out
of continuous mode automatically.
Shifting out of continuous mode requires a potential 1 / ODR wait which
is also implemented.
Modified the sleep method when data is not ready to allow for
sampling > 50sps to work.

Signed-off-by: Richard Tresidder <rtresidd@electromag.com.au>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
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Richard Tresidder authored and Jonathan Cameron committed May 12, 2018
1 parent e2fad74 commit 3345d47
Showing 1 changed file with 140 additions and 18 deletions.
158 changes: 140 additions & 18 deletions drivers/iio/magnetometer/mag3110.c
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Original file line number Diff line number Diff line change
Expand Up @@ -26,6 +26,7 @@
#define MAG3110_OUT_Y 0x03
#define MAG3110_OUT_Z 0x05
#define MAG3110_WHO_AM_I 0x07
#define MAG3110_SYSMOD 0x08
#define MAG3110_OFF_X 0x09 /* MSB first */
#define MAG3110_OFF_Y 0x0b
#define MAG3110_OFF_Z 0x0d
Expand All @@ -39,6 +40,8 @@
#define MAG3110_CTRL_DR_SHIFT 5
#define MAG3110_CTRL_DR_DEFAULT 0

#define MAG3110_SYSMOD_MODE_MASK GENMASK(1, 0)

#define MAG3110_CTRL_TM BIT(1) /* trigger single measurement */
#define MAG3110_CTRL_AC BIT(0) /* continuous measurements */

Expand All @@ -52,17 +55,20 @@ struct mag3110_data {
struct i2c_client *client;
struct mutex lock;
u8 ctrl_reg1;
int sleep_val;
};

static int mag3110_request(struct mag3110_data *data)
{
int ret, tries = 150;

/* trigger measurement */
ret = i2c_smbus_write_byte_data(data->client, MAG3110_CTRL_REG1,
data->ctrl_reg1 | MAG3110_CTRL_TM);
if (ret < 0)
return ret;
if ((data->ctrl_reg1 & MAG3110_CTRL_AC) == 0) {
/* trigger measurement */
ret = i2c_smbus_write_byte_data(data->client, MAG3110_CTRL_REG1,
data->ctrl_reg1 | MAG3110_CTRL_TM);
if (ret < 0)
return ret;
}

while (tries-- > 0) {
ret = i2c_smbus_read_byte_data(data->client, MAG3110_STATUS);
Expand All @@ -71,7 +77,11 @@ static int mag3110_request(struct mag3110_data *data)
/* wait for data ready */
if ((ret & MAG3110_STATUS_DRDY) == MAG3110_STATUS_DRDY)
break;
msleep(20);

if (data->sleep_val <= 20)
usleep_range(data->sleep_val * 250, data->sleep_val * 500);
else
msleep(20);
}

if (tries < 0) {
Expand Down Expand Up @@ -144,6 +154,117 @@ static int mag3110_get_samp_freq_index(struct mag3110_data *data,
val2);
}

static int mag3110_calculate_sleep(struct mag3110_data *data)
{
int ret, i = data->ctrl_reg1 >> MAG3110_CTRL_DR_SHIFT;

if (mag3110_samp_freq[i][0] > 0)
ret = 1000 / mag3110_samp_freq[i][0];
else
ret = 1000;

return ret == 0 ? 1 : ret;
}

static int mag3110_standby(struct mag3110_data *data)
{
return i2c_smbus_write_byte_data(data->client, MAG3110_CTRL_REG1,
data->ctrl_reg1 & ~MAG3110_CTRL_AC);
}

static int mag3110_wait_standby(struct mag3110_data *data)
{
int ret, tries = 30;

/*
* Takes up to 1/ODR to come out of active mode into stby
* Longest expected period is 12.5seconds.
* We'll sleep for 500ms between checks
*/
while (tries-- > 0) {
ret = i2c_smbus_read_byte_data(data->client, MAG3110_SYSMOD);
if (ret < 0) {
dev_err(&data->client->dev, "i2c error\n");
return ret;
}
/* wait for standby */
if ((ret & MAG3110_SYSMOD_MODE_MASK) == 0)
break;

msleep_interruptible(500);
}

if (tries < 0) {
dev_err(&data->client->dev, "device not entering standby mode\n");
return -EIO;
}

return 0;
}

static int mag3110_active(struct mag3110_data *data)
{
return i2c_smbus_write_byte_data(data->client, MAG3110_CTRL_REG1,
data->ctrl_reg1);
}

/* returns >0 if active, 0 if in standby and <0 on error */
static int mag3110_is_active(struct mag3110_data *data)
{
int reg;

reg = i2c_smbus_read_byte_data(data->client, MAG3110_CTRL_REG1);
if (reg < 0)
return reg;

return reg & MAG3110_CTRL_AC;
}

static int mag3110_change_config(struct mag3110_data *data, u8 reg, u8 val)
{
int ret;
int is_active;

mutex_lock(&data->lock);

is_active = mag3110_is_active(data);
if (is_active < 0) {
ret = is_active;
goto fail;
}

/* config can only be changed when in standby */
if (is_active > 0) {
ret = mag3110_standby(data);
if (ret < 0)
goto fail;
}

/*
* After coming out of active we must wait for the part
* to transition to STBY. This can take up to 1 /ODR to occur
*/
ret = mag3110_wait_standby(data);
if (ret < 0)
goto fail;

ret = i2c_smbus_write_byte_data(data->client, reg, val);
if (ret < 0)
goto fail;

if (is_active > 0) {
ret = mag3110_active(data);
if (ret < 0)
goto fail;
}

ret = 0;
fail:
mutex_unlock(&data->lock);

return ret;
}

static int mag3110_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val, int *val2, long mask)
Expand Down Expand Up @@ -235,11 +356,15 @@ static int mag3110_write_raw(struct iio_dev *indio_dev,
ret = -EINVAL;
break;
}

data->ctrl_reg1 &= ~MAG3110_CTRL_DR_MASK;
data->ctrl_reg1 &= 0xff & ~MAG3110_CTRL_DR_MASK
& ~MAG3110_CTRL_AC;
data->ctrl_reg1 |= rate << MAG3110_CTRL_DR_SHIFT;
ret = i2c_smbus_write_byte_data(data->client,
MAG3110_CTRL_REG1, data->ctrl_reg1);
data->sleep_val = mag3110_calculate_sleep(data);
if (data->sleep_val < 40)
data->ctrl_reg1 |= MAG3110_CTRL_AC;

ret = mag3110_change_config(data, MAG3110_CTRL_REG1,
data->ctrl_reg1);
break;
case IIO_CHAN_INFO_CALIBBIAS:
if (val < -10000 || val > 10000) {
Expand Down Expand Up @@ -337,12 +462,6 @@ static const struct iio_info mag3110_info = {

static const unsigned long mag3110_scan_masks[] = {0x7, 0xf, 0};

static int mag3110_standby(struct mag3110_data *data)
{
return i2c_smbus_write_byte_data(data->client, MAG3110_CTRL_REG1,
data->ctrl_reg1 & ~MAG3110_CTRL_AC);
}

static int mag3110_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
Expand Down Expand Up @@ -374,8 +493,11 @@ static int mag3110_probe(struct i2c_client *client,
indio_dev->available_scan_masks = mag3110_scan_masks;

data->ctrl_reg1 = MAG3110_CTRL_DR_DEFAULT << MAG3110_CTRL_DR_SHIFT;
ret = i2c_smbus_write_byte_data(client, MAG3110_CTRL_REG1,
data->ctrl_reg1);
data->sleep_val = mag3110_calculate_sleep(data);
if (data->sleep_val < 40)
data->ctrl_reg1 |= MAG3110_CTRL_AC;

ret = mag3110_change_config(data, MAG3110_CTRL_REG1, data->ctrl_reg1);
if (ret < 0)
return ret;

Expand Down

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