v3 addresses review comments:
* rotate tables (Jonathan Cameron)
* remove trailing space, add newline in sysfs output (Jonathan Cameron)
* split out patch for reorganization of hmc5843_set_rate() (Jonathan Cameron)
* use static table to describe chip variants (Jonathan Cameron)
v2 addresses review comments:
* fixes and cleanups have been split out (Jonathan Cameron)
* constants are generally prefixed HMC5843_, except when related
specifically to hmc5883 (Jonathan Cameron)
* simplify code and avoid temp buffer in
hmc5843_show_sampling_frequencies_available() (Lars-Peter Clausen)
* use sysfs_streq() instead of strncmp()/strlen() in
hmc5843_check_sampling_frequency() (Lars-Peter Clausen)
Signed-off-by: Peter Meerwald <pmeerw@xxxxxxxxxx>
Acked-by: Jonathan Cameron <jic23@xxxxxxxxxx>
---
drivers/staging/iio/magnetometer/Kconfig | 8 +-
drivers/staging/iio/magnetometer/hmc5843.c | 188 ++++++++++++++++++++++------
2 files changed, 151 insertions(+), 45 deletions(-)
diff --git a/drivers/staging/iio/magnetometer/Kconfig b/drivers/staging/iio/magnetometer/Kconfig
index 722c4e1..b9d9325 100644
--- a/drivers/staging/iio/magnetometer/Kconfig
+++ b/drivers/staging/iio/magnetometer/Kconfig
@@ -15,13 +15,13 @@ config SENSORS_AK8975
will be called ak8975.
config SENSORS_HMC5843
- tristate "Honeywell HMC5843 3-Axis Magnetometer"
+ tristate "Honeywell HMC5843/5883/5883L 3-Axis Magnetometer"
depends on I2C
help
- Say Y here to add support for the Honeywell HMC 5843 3-Axis
- Magnetometer (digital compass).
+ Say Y here to add support for the Honeywell HMC5843, HMC5883 and
+ HMC5883L 3-Axis Magnetometer (digital compass).
To compile this driver as a module, choose M here: the module
- will be called hmc5843
+ will be called hmc5843.
endmenu
diff --git a/drivers/staging/iio/magnetometer/hmc5843.c b/drivers/staging/iio/magnetometer/hmc5843.c
index 97cfac7..1831224 100644
--- a/drivers/staging/iio/magnetometer/hmc5843.c
+++ b/drivers/staging/iio/magnetometer/hmc5843.c
@@ -2,6 +2,8 @@
Author: Shubhrajyoti Datta <shubhrajyoti@xxxxxx>
Acknowledgement: Jonathan Cameron <jic23@xxxxxxxxx> for valuable inputs.
+ Support for HMC5883 and HMC5883L by Peter Meerwald <pmeerw@xxxxxxxxxx>.
+
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
@@ -44,6 +46,11 @@
#define HMC5843_ID_REG_B 0x0B
#define HMC5843_ID_REG_C 0x0C
+enum hmc5843_ids {
+ HMC5843_ID,
+ HMC5883_ID,
+ HMC5883L_ID,
+};
/*
* Beware: identification of the HMC5883 is still "H43";
@@ -103,8 +110,16 @@ static const int hmc5843_regval_to_nanoscale[] = {
6173, 7692, 10309, 12821, 18868, 21739, 25641, 35714
};
+static const int hmc5883_regval_to_nanoscale[] = {
+ 7812, 9766, 13021, 16287, 24096, 27701, 32573, 45662
+};
+
+static const int hmc5883l_regval_to_nanoscale[] = {
+ 7299, 9174, 12195, 15152, 22727, 25641, 30303, 43478
+};
+
/*
- * From the datasheet:
+ * From the HMC5843 datasheet:
* Value | Sensor input field range (Ga) | Gain (counts/milli-Gauss)
* 0 | (+-)0.7 | 1620
* 1 | (+-)1.0 | 1300
@@ -114,44 +129,75 @@ static const int hmc5843_regval_to_nanoscale[] = {
* 5 | (+-)3.8 | 460
* 6 | (+-)4.5 | 390
* 7 | (+-)6.5 | 280
+ *
+ * From the HMC5883 datasheet:
+ * Value | Recommended sensor field range (Ga) | Gain (counts/Gauss)
+ * 0 | (+-)0.9 | 1280
+ * 1 | (+-)1.2 | 1024
+ * 2 | (+-)1.9 | 768
+ * 3 | (+-)2.5 | 614
+ * 4 | (+-)4.0 | 415
+ * 5 | (+-)4.6 | 361
+ * 6 | (+-)5.5 | 307
+ * 7 | (+-)7.9 | 219
+ *
+ * From the HMC5883L datasheet:
+ * Value | Recommended sensor field range (Ga) | Gain (LSB/Gauss)
+ * 0 | (+-)0.88 | 1370
+ * 1 | (+-)1.3 | 1090
+ * 2 | (+-)1.9 | 820
+ * 3 | (+-)2.5 | 660
+ * 4 | (+-)4.0 | 440
+ * 5 | (+-)4.7 | 390
+ * 6 | (+-)5.6 | 330
+ * 7 | (+-)8.1 | 230
*/
static const int hmc5843_regval_to_input_field_mga[] = {
- 700,
- 1000,
- 1500,
- 2000,
- 3200,
- 3800,
- 4500,
- 6500
+ 700, 1000, 1500, 2000, 3200, 3800, 4500, 6500
+};
+
+static const int hmc5883_regval_to_input_field_mga[] = {
+ 900, 1200, 1900, 2500, 4000, 4600, 5500, 7900
+};
+
+static const int hmc5883l_regval_to_input_field_mga[] = {
+ 880, 1300, 1900, 2500, 4000, 4700, 5600, 8100
};
/*
* From the datasheet:
- * Value | Data output rate (Hz)
- * 0 | 0.5
- * 1 | 1
- * 2 | 2
- * 3 | 5
- * 4 | 10 (default)
- * 5 | 20
- * 6 | 50
- * 7 | Not used
+ * Value | HMC5843 | HMC5883/HMC5883L
+ * | Data output rate (Hz) | Data output rate (Hz)
+ * 0 | 0.5 | 0.75
+ * 1 | 1 | 1.5
+ * 2 | 2 | 3
+ * 3 | 5 | 7.5
+ * 4 | 10 (default) | 15
+ * 5 | 20 | 30
+ * 6 | 50 | 75
+ * 7 | Not used | Not used
*/
static const char * const hmc5843_regval_to_sample_freq[] = {
- "0.5",
- "1",
- "2",
- "5",
- "10",
- "20",
- "50",
+ "0.5", "1", "2", "5", "10", "20", "50",
+};
+
+static const char * const hmc5883_regval_to_sample_freq[] = {
+ "0.75", "1.5", "3", "7.5", "15", "30", "75",
};
/* Addresses to scan: 0x1E */
static const unsigned short normal_i2c[] = { HMC5843_I2C_ADDRESS,
I2C_CLIENT_END };
+/* Describe chip variants */
+struct hmc5843_chip_info {
+ const struct iio_chan_spec *channels;
+ int num_channels;
+ const char * const *regval_to_sample_freq;
+ const int *regval_to_input_field_mga;
+ const int *regval_to_nanoscale;
+};
+
/* Each client has this additional data */
struct hmc5843_data {
struct mutex lock;
@@ -159,6 +206,7 @@ struct hmc5843_data {
u8 meas_conf;
u8 operating_mode;
u8 range;
+ const struct hmc5843_chip_info *variant;
};
/* The lower two bits contain the current conversion mode */
@@ -334,7 +382,27 @@ static IIO_DEVICE_ATTR(meas_conf,
hmc5843_set_measurement_configuration,
0);
-static IIO_CONST_ATTR_SAMP_FREQ_AVAIL("0.5 1 2 5 10 20 50");
+static ssize_t hmc5843_show_sampling_frequencies_available(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct hmc5843_data *data = iio_priv(indio_dev);
+ ssize_t total_n = 0;
+ int i;
+
+ for (i = 0; i < HMC5843_RATE_NOT_USED; i++) {
+ ssize_t n = sprintf(buf, "%s ", data->variant->regval_to_sample_freq[i]);
+ buf += n;
+ total_n += n;
+ }
+ /* replace trailing space by newline */
+ buf[-1] = '\n';
+
+ return total_n;
+}
+
+static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(hmc5843_show_sampling_frequencies_available);
static s32 hmc5843_set_rate(struct i2c_client *client,
u8 rate)
@@ -356,12 +424,11 @@ static s32 hmc5843_set_rate(struct i2c_client *client,
static int hmc5843_check_sampling_frequency(struct hmc5843_data *data,
const char *buf)
{
- const char * const *samp_freq = hmc5843_regval_to_sample_freq;
+ const char * const *samp_freq = data->variant->regval_to_sample_freq;
int i;
for (i = 0; i < HMC5843_RATE_NOT_USED; i++) {
- if (strncmp(buf, samp_freq[i],
- strlen(samp_freq[i])) == 0)
+ if (sysfs_streq(buf, samp_freq[i]))
return i;
}
@@ -404,13 +471,14 @@ static ssize_t hmc5843_show_sampling_frequency(struct device *dev,
struct iio_dev *indio_dev = dev_to_iio_dev(dev);
struct i2c_client *client = to_i2c_client(indio_dev->dev.parent);
struct iio_dev_attr *this_attr = to_iio_dev_attr(attr);
+ struct hmc5843_data *data = iio_priv(indio_dev);
s32 rate;
rate = i2c_smbus_read_byte_data(client, this_attr->address);
if (rate < 0)
return rate;
rate = (rate & HMC5843_RATE_BITMASK) >> HMC5843_RATE_OFFSET;
- return sprintf(buf, "%s\n", hmc5843_regval_to_sample_freq[rate]);
+ return sprintf(buf, "%s\n", data->variant->regval_to_sample_freq[rate]);
}
static IIO_DEVICE_ATTR(sampling_frequency,
@@ -428,7 +496,7 @@ static ssize_t hmc5843_show_range_gain(struct device *dev,
struct hmc5843_data *data = iio_priv(indio_dev);
range = data->range;
- return sprintf(buf, "%d\n", hmc5843_regval_to_input_field_mga[range]);
+ return sprintf(buf, "%d\n", data->variant->regval_to_input_field_mga[range]);
}
static ssize_t hmc5843_set_range_gain(struct device *dev,
@@ -486,7 +554,7 @@ static int hmc5843_read_raw(struct iio_dev *indio_dev,
val);
case IIO_CHAN_INFO_SCALE:
*val = 0;
- *val2 = hmc5843_regval_to_nanoscale[data->range];
+ *val2 = data->variant->regval_to_nanoscale[data->range];
return IIO_VAL_INT_PLUS_NANO;
};
return -EINVAL;
@@ -508,12 +576,18 @@ static const struct iio_chan_spec hmc5843_channels[] = {
HMC5843_CHANNEL(Z, HMC5843_DATA_OUT_Z_MSB_REG),
};
+static const struct iio_chan_spec hmc5883_channels[] = {
+ HMC5843_CHANNEL(X, HMC5843_DATA_OUT_X_MSB_REG),
+ HMC5843_CHANNEL(Y, HMC5883_DATA_OUT_Y_MSB_REG),
+ HMC5843_CHANNEL(Z, HMC5883_DATA_OUT_Z_MSB_REG),
+};
+
static struct attribute *hmc5843_attributes[] = {
&iio_dev_attr_meas_conf.dev_attr.attr,
&iio_dev_attr_operating_mode.dev_attr.attr,
&iio_dev_attr_sampling_frequency.dev_attr.attr,
&iio_dev_attr_in_magn_range.dev_attr.attr,
- &iio_const_attr_sampling_frequency_available.dev_attr.attr,
+ &iio_dev_attr_sampling_frequency_available.dev_attr.attr,
NULL
};
@@ -521,6 +596,33 @@ static const struct attribute_group hmc5843_group = {
.attrs = hmc5843_attributes,
};
+static const struct hmc5843_chip_info hmc5843_chip_info_tbl[] = {
+ [HMC5843_ID] = {
+ .channels = hmc5843_channels,
+ .num_channels = ARRAY_SIZE(hmc5843_channels),
+ .regval_to_sample_freq = hmc5843_regval_to_sample_freq,
+ .regval_to_input_field_mga =
+ hmc5843_regval_to_input_field_mga,
+ .regval_to_nanoscale = hmc5843_regval_to_nanoscale,
+ },
+ [HMC5883_ID] = {
+ .channels = hmc5883_channels,
+ .num_channels = ARRAY_SIZE(hmc5883_channels),
+ .regval_to_sample_freq = hmc5883_regval_to_sample_freq,
+ .regval_to_input_field_mga =
+ hmc5883_regval_to_input_field_mga,
+ .regval_to_nanoscale = hmc5883_regval_to_nanoscale,
+ },
+ [HMC5883L_ID] = {
+ .channels = hmc5883_channels,
+ .num_channels = ARRAY_SIZE(hmc5883_channels),
+ .regval_to_sample_freq = hmc5883_regval_to_sample_freq,
+ .regval_to_input_field_mga =
+ hmc5883l_regval_to_input_field_mga,
+ .regval_to_nanoscale = hmc5883l_regval_to_nanoscale,
+ },
+};
+
static int hmc5843_detect(struct i2c_client *client,
struct i2c_board_info *info)
{
@@ -540,19 +642,23 @@ static int hmc5843_detect(struct i2c_client *client,
return 0;
}
-/* Called when we have found a new HMC5843 */
-static void hmc5843_init_client(struct i2c_client *client)
+/* Called when we have found a new HMC58X3 */
+static void hmc5843_init_client(struct i2c_client *client,
+ const struct i2c_device_id *id)
{
struct iio_dev *indio_dev = i2c_get_clientdata(client);
struct hmc5843_data *data = iio_priv(indio_dev);
+ data->variant = &hmc5843_chip_info_tbl[id->driver_data];
+ indio_dev->channels = data->variant->channels;
+ indio_dev->num_channels = data->variant->num_channels;
hmc5843_set_meas_conf(client, data->meas_conf);
hmc5843_set_rate(client, data->rate);
hmc5843_configure(client, data->operating_mode);
i2c_smbus_write_byte_data(client, HMC5843_CONFIG_REG_B, data->range);
mutex_init(&data->lock);
- pr_info("HMC5843 initialized\n");
+ pr_info("%s initialized\n", id->name);
}
static const struct iio_info hmc5843_info = {
@@ -581,12 +687,10 @@ static int hmc5843_probe(struct i2c_client *client,
data->operating_mode = HMC5843_MODE_CONVERSION_CONTINUOUS;
i2c_set_clientdata(client, indio_dev);
- hmc5843_init_client(client);
+ hmc5843_init_client(client, id);
indio_dev->info = &hmc5843_info;
indio_dev->name = id->name;
- indio_dev->channels = hmc5843_channels;
- indio_dev->num_channels = ARRAY_SIZE(hmc5843_channels);
indio_dev->dev.parent = &client->dev;
indio_dev->modes = INDIO_DIRECT_MODE;
@@ -639,7 +743,9 @@ static SIMPLE_DEV_PM_OPS(hmc5843_pm_ops, hmc5843_suspend, hmc5843_resume);
#endif
static const struct i2c_device_id hmc5843_id[] = {
- { "hmc5843", 0 },
+ { "hmc5843", HMC5843_ID },
+ { "hmc5883", HMC5883_ID },
+ { "hmc5883l", HMC5883L_ID },
{ }
};
MODULE_DEVICE_TABLE(i2c, hmc5843_id);
@@ -658,5 +764,5 @@ static struct i2c_driver hmc5843_driver = {
module_i2c_driver(hmc5843_driver);
MODULE_AUTHOR("Shubhrajyoti Datta <shubhrajyoti@xxxxxx");
-MODULE_DESCRIPTION("HMC5843 driver");
+MODULE_DESCRIPTION("HMC5843/5883/5883L driver");
MODULE_LICENSE("GPL");
--
1.7.5.4
--
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