* [PATCH v2 1/5] staging:iio:hmc5843: Added regmap support
2014-07-07 20:33 [PATCH v2 0/5] staging:iio:hmc5843: Few adjustments and support for hmc5983 Josef Gajdusek
@ 2014-07-07 20:34 ` Josef Gajdusek
2014-07-07 20:36 ` [PATCH v2 2/5] staging:iio:hmc5843: Split hmc5843.c to multiple files Josef Gajdusek
` (3 subsequent siblings)
4 siblings, 0 replies; 8+ messages in thread
From: Josef Gajdusek @ 2014-07-07 20:34 UTC (permalink / raw)
To: linux-iio; +Cc: devel, gregkh, jic23, linux-kernel, pmeerw
This patch changes hmc5843.c to use regmap. This provides transparent caching
to the code as well as abstraction necessary to add support for SPI-based
hmc5983.
Signed-off-by: Josef Gajdusek <atx@atx.name>
---
drivers/staging/iio/magnetometer/Kconfig | 1 +
drivers/staging/iio/magnetometer/hmc5843.c | 139 +++++++++++++++++++----------
2 files changed, 95 insertions(+), 45 deletions(-)
diff --git a/drivers/staging/iio/magnetometer/Kconfig b/drivers/staging/iio/magnetometer/Kconfig
index 34634da..ad88d61 100644
--- a/drivers/staging/iio/magnetometer/Kconfig
+++ b/drivers/staging/iio/magnetometer/Kconfig
@@ -8,6 +8,7 @@ config SENSORS_HMC5843
depends on I2C
select IIO_BUFFER
select IIO_TRIGGERED_BUFFER
+ select REGMAP_I2C
help
Say Y here to add support for the Honeywell HMC5843, HMC5883 and
HMC5883L 3-Axis Magnetometer (digital compass).
diff --git a/drivers/staging/iio/magnetometer/hmc5843.c b/drivers/staging/iio/magnetometer/hmc5843.c
index d4f4dd9..1a48799 100644
--- a/drivers/staging/iio/magnetometer/hmc5843.c
+++ b/drivers/staging/iio/magnetometer/hmc5843.c
@@ -21,6 +21,7 @@
#include <linux/module.h>
#include <linux/i2c.h>
+#include <linux/regmap.h>
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/iio/trigger_consumer.h>
@@ -34,6 +35,7 @@
#define HMC5843_DATA_OUT_MSB_REGS 0x03
#define HMC5843_STATUS_REG 0x09
#define HMC5843_ID_REG 0x0a
+#define HMC5843_ID_END 0x0c
enum hmc5843_ids {
HMC5843_ID,
@@ -49,6 +51,7 @@ enum hmc5843_ids {
#define HMC5843_RANGE_GAIN_OFFSET 0x05
#define HMC5843_RANGE_GAIN_DEFAULT 0x01
#define HMC5843_RANGE_GAINS 8
+#define HMC5843_RANGE_GAIN_MASK 0xe0
/* Device status */
#define HMC5843_DATA_READY 0x01
@@ -68,6 +71,7 @@ enum hmc5843_ids {
#define HMC5843_RATE_OFFSET 0x02
#define HMC5843_RATE_DEFAULT 0x04
#define HMC5843_RATES 7
+#define HMC5843_RATE_MASK 0x1c
/* Device measurement configuration */
#define HMC5843_MEAS_CONF_NORMAL 0x00
@@ -121,10 +125,7 @@ struct hmc5843_chip_info {
struct hmc5843_data {
struct i2c_client *client;
struct mutex lock;
- u8 rate;
- u8 meas_conf;
- u8 operating_mode;
- u8 range;
+ struct regmap *regmap;
const struct hmc5843_chip_info *variant;
__be16 buffer[8]; /* 3x 16-bit channels + padding + 64-bit timestamp */
};
@@ -135,10 +136,8 @@ static s32 hmc5843_set_mode(struct hmc5843_data *data, u8 operating_mode)
int ret;
mutex_lock(&data->lock);
- ret = i2c_smbus_write_byte_data(data->client, HMC5843_MODE_REG,
- operating_mode & HMC5843_MODE_MASK);
- if (ret >= 0)
- data->operating_mode = operating_mode;
+ ret = regmap_update_bits(data->regmap, HMC5843_MODE_REG,
+ HMC5843_MODE_MASK, operating_mode);
mutex_unlock(&data->lock);
return ret;
@@ -146,15 +145,15 @@ static s32 hmc5843_set_mode(struct hmc5843_data *data, u8 operating_mode)
static int hmc5843_wait_measurement(struct hmc5843_data *data)
{
- s32 result;
int tries = 150;
+ int val;
+ int ret;
while (tries-- > 0) {
- result = i2c_smbus_read_byte_data(data->client,
- HMC5843_STATUS_REG);
- if (result < 0)
- return result;
- if (result & HMC5843_DATA_READY)
+ ret = regmap_read(data->regmap, HMC5843_STATUS_REG, &val);
+ if (ret < 0)
+ return ret;
+ if (val & HMC5843_DATA_READY)
break;
msleep(20);
}
@@ -171,20 +170,20 @@ static int hmc5843_wait_measurement(struct hmc5843_data *data)
static int hmc5843_read_measurement(struct hmc5843_data *data,
int idx, int *val)
{
- s32 result;
__be16 values[3];
+ int ret;
mutex_lock(&data->lock);
- result = hmc5843_wait_measurement(data);
- if (result < 0) {
+ ret = hmc5843_wait_measurement(data);
+ if (ret < 0) {
mutex_unlock(&data->lock);
- return result;
+ return ret;
}
- result = i2c_smbus_read_i2c_block_data(data->client,
- HMC5843_DATA_OUT_MSB_REGS, sizeof(values), (u8 *) values);
+ ret = regmap_bulk_read(data->regmap, HMC5843_DATA_OUT_MSB_REGS,
+ values, sizeof(values));
mutex_unlock(&data->lock);
- if (result < 0)
- return -EINVAL;
+ if (ret < 0)
+ return ret;
*val = sign_extend32(be16_to_cpu(values[idx]), 15);
return IIO_VAL_INT;
@@ -208,16 +207,13 @@ static int hmc5843_read_measurement(struct hmc5843_data *data,
* and BN.
*
*/
-static s32 hmc5843_set_meas_conf(struct hmc5843_data *data, u8 meas_conf)
+static int hmc5843_set_meas_conf(struct hmc5843_data *data, u8 meas_conf)
{
int ret;
mutex_lock(&data->lock);
- ret = i2c_smbus_write_byte_data(data->client, HMC5843_CONFIG_REG_A,
- (meas_conf & HMC5843_MEAS_CONF_MASK) |
- (data->rate << HMC5843_RATE_OFFSET));
- if (ret >= 0)
- data->meas_conf = meas_conf;
+ ret = regmap_update_bits(data->regmap, HMC5843_CONFIG_REG_A,
+ HMC5843_MEAS_CONF_MASK, meas_conf);
mutex_unlock(&data->lock);
return ret;
@@ -228,7 +224,15 @@ static ssize_t hmc5843_show_measurement_configuration(struct device *dev,
char *buf)
{
struct hmc5843_data *data = iio_priv(dev_to_iio_dev(dev));
- return sprintf(buf, "%d\n", data->meas_conf);
+ int val;
+ int ret;
+
+ ret = regmap_read(data->regmap, HMC5843_CONFIG_REG_A, &val);
+ if (ret)
+ return ret;
+ val &= HMC5843_MEAS_CONF_MASK;
+
+ return sprintf(buf, "%d\n", val);
}
static ssize_t hmc5843_set_measurement_configuration(struct device *dev,
@@ -282,10 +286,8 @@ static int hmc5843_set_samp_freq(struct hmc5843_data *data, u8 rate)
int ret;
mutex_lock(&data->lock);
- ret = i2c_smbus_write_byte_data(data->client, HMC5843_CONFIG_REG_A,
- data->meas_conf | (rate << HMC5843_RATE_OFFSET));
- if (ret >= 0)
- data->rate = rate;
+ ret = regmap_update_bits(data->regmap, HMC5843_CONFIG_REG_A,
+ HMC5843_RATE_MASK, rate << HMC5843_RATE_OFFSET);
mutex_unlock(&data->lock);
return ret;
@@ -309,10 +311,9 @@ static int hmc5843_set_range_gain(struct hmc5843_data *data, u8 range)
int ret;
mutex_lock(&data->lock);
- ret = i2c_smbus_write_byte_data(data->client, HMC5843_CONFIG_REG_B,
- range << HMC5843_RANGE_GAIN_OFFSET);
- if (ret >= 0)
- data->range = range;
+ ret = regmap_update_bits(data->regmap, HMC5843_CONFIG_REG_B,
+ HMC5843_RANGE_GAIN_MASK,
+ range << HMC5843_RANGE_GAIN_OFFSET);
mutex_unlock(&data->lock);
return ret;
@@ -358,17 +359,26 @@ static int hmc5843_read_raw(struct iio_dev *indio_dev,
int *val, int *val2, long mask)
{
struct hmc5843_data *data = iio_priv(indio_dev);
+ int rval;
+ int ret;
switch (mask) {
case IIO_CHAN_INFO_RAW:
return hmc5843_read_measurement(data, chan->scan_index, val);
case IIO_CHAN_INFO_SCALE:
+ ret = regmap_read(data->regmap, HMC5843_CONFIG_REG_B, &rval);
+ if (ret < 0)
+ return ret;
*val = 0;
- *val2 = data->variant->regval_to_nanoscale[data->range];
+ *val2 = data->variant->regval_to_nanoscale[rval >> HMC5843_RANGE_GAIN_OFFSET];
return IIO_VAL_INT_PLUS_NANO;
case IIO_CHAN_INFO_SAMP_FREQ:
- *val = data->variant->regval_to_samp_freq[data->rate][0];
- *val2 = data->variant->regval_to_samp_freq[data->rate][1];
+ ret = regmap_read(data->regmap, HMC5843_CONFIG_REG_A, &rval);
+ if (ret < 0)
+ return ret;
+ rval &= HMC5843_RATE_MASK;
+ *val = data->variant->regval_to_samp_freq[rval][0];
+ *val2 = data->variant->regval_to_samp_freq[rval][1];
return IIO_VAL_INT_PLUS_MICRO;
}
return -EINVAL;
@@ -426,9 +436,9 @@ static irqreturn_t hmc5843_trigger_handler(int irq, void *p)
goto done;
}
- ret = i2c_smbus_read_i2c_block_data(data->client,
- HMC5843_DATA_OUT_MSB_REGS, 3 * sizeof(__be16),
- (u8 *) data->buffer);
+ ret = regmap_bulk_read(data->regmap, HMC5843_DATA_OUT_MSB_REGS,
+ data->buffer, 3 * sizeof(__be16));
+
mutex_unlock(&data->lock);
if (ret < 0)
goto done;
@@ -508,8 +518,8 @@ static int hmc5843_init(struct hmc5843_data *data)
int ret;
u8 id[3];
- ret = i2c_smbus_read_i2c_block_data(data->client, HMC5843_ID_REG,
- sizeof(id), id);
+ ret = regmap_bulk_read(data->regmap, HMC5843_ID_REG,
+ id, ARRAY_SIZE(id));
if (ret < 0)
return ret;
if (id[0] != 'H' || id[1] != '4' || id[2] != '3') {
@@ -539,6 +549,44 @@ static const struct iio_info hmc5843_info = {
static const unsigned long hmc5843_scan_masks[] = {0x7, 0};
+static const struct regmap_range hmc5843_readable_ranges[] = {
+ regmap_reg_range(0, HMC5843_ID_END),
+};
+
+static struct regmap_access_table hmc5843_readable_table = {
+ .yes_ranges = hmc5843_readable_ranges,
+ .n_yes_ranges = ARRAY_SIZE(hmc5843_readable_ranges),
+};
+
+static const struct regmap_range hmc5843_writable_ranges[] = {
+ regmap_reg_range(0, HMC5843_MODE_REG),
+};
+
+static struct regmap_access_table hmc5843_writable_table = {
+ .yes_ranges = hmc5843_writable_ranges,
+ .n_yes_ranges = ARRAY_SIZE(hmc5843_writable_ranges),
+};
+
+static const struct regmap_range hmc5843_volatile_ranges[] = {
+ regmap_reg_range(HMC5843_DATA_OUT_MSB_REGS, HMC5843_STATUS_REG),
+};
+
+static struct regmap_access_table hmc5843_volatile_table = {
+ .yes_ranges = hmc5843_volatile_ranges,
+ .n_yes_ranges = ARRAY_SIZE(hmc5843_volatile_ranges),
+};
+
+static struct regmap_config hmc5843_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+
+ .rd_table = &hmc5843_readable_table,
+ .wr_table = &hmc5843_writable_table,
+ .volatile_table = &hmc5843_volatile_table,
+
+ .cache_type = REGCACHE_RBTREE,
+};
+
static int hmc5843_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
@@ -554,6 +602,7 @@ static int hmc5843_probe(struct i2c_client *client,
data = iio_priv(indio_dev);
data->client = client;
data->variant = &hmc5843_chip_info_tbl[id->driver_data];
+ data->regmap = devm_regmap_init_i2c(client, &hmc5843_regmap_config);
mutex_init(&data->lock);
i2c_set_clientdata(client, indio_dev);
--
1.8.5.5
^ permalink raw reply related [flat|nested] 8+ messages in thread* [PATCH v2 2/5] staging:iio:hmc5843: Split hmc5843.c to multiple files
2014-07-07 20:33 [PATCH v2 0/5] staging:iio:hmc5843: Few adjustments and support for hmc5983 Josef Gajdusek
2014-07-07 20:34 ` [PATCH v2 1/5] staging:iio:hmc5843: Added regmap support Josef Gajdusek
@ 2014-07-07 20:36 ` Josef Gajdusek
2014-07-08 8:23 ` Dan Carpenter
2014-07-07 20:37 ` [PATCH v2 3/5] staging:iio:hmc5843: register <-> value arrays now can have different lengths Josef Gajdusek
` (2 subsequent siblings)
4 siblings, 1 reply; 8+ messages in thread
From: Josef Gajdusek @ 2014-07-07 20:36 UTC (permalink / raw)
To: linux-iio; +Cc: devel, gregkh, jic23, linux-kernel, pmeerw
This patch splits hmc5843.c to multiple files - the interface-agnostic
hmc5843_core.c, i2c specific hmc5843_i2c.c and header file hmc5843.h. This is
another step to add support of SPI-enabled hmc5983.
Signed-off-by: Josef Gajdusek <atx@atx.name>
---
drivers/staging/iio/magnetometer/Kconfig | 16 +-
drivers/staging/iio/magnetometer/Makefile | 3 +-
drivers/staging/iio/magnetometer/hmc5843.c | 701 ------------------------
drivers/staging/iio/magnetometer/hmc5843.h | 75 +++
drivers/staging/iio/magnetometer/hmc5843_core.c | 600 ++++++++++++++++++++
drivers/staging/iio/magnetometer/hmc5843_i2c.c | 106 ++++
6 files changed, 795 insertions(+), 706 deletions(-)
delete mode 100644 drivers/staging/iio/magnetometer/hmc5843.c
create mode 100644 drivers/staging/iio/magnetometer/hmc5843.h
create mode 100644 drivers/staging/iio/magnetometer/hmc5843_core.c
create mode 100644 drivers/staging/iio/magnetometer/hmc5843_i2c.c
diff --git a/drivers/staging/iio/magnetometer/Kconfig b/drivers/staging/iio/magnetometer/Kconfig
index ad88d61..28c2612 100644
--- a/drivers/staging/iio/magnetometer/Kconfig
+++ b/drivers/staging/iio/magnetometer/Kconfig
@@ -5,15 +5,23 @@ menu "Magnetometer sensors"
config SENSORS_HMC5843
tristate "Honeywell HMC5843/5883/5883L 3-Axis Magnetometer"
- depends on I2C
+ depends on (I2C || SPI_MASTER)
select IIO_BUFFER
select IIO_TRIGGERED_BUFFER
- select REGMAP_I2C
+ select SENSORS_HMC5843_I2C if (I2C)
help
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.
+ This driver can also be compiled as a set of modules.
+ If so, these modules will be created:
+ - hmc5843_core (core functions)
+ - hmc5843_i2c (support for HMC5843, HMC5883 and HMC5883L)
+
+config SENSORS_HMC5843_I2C
+ tristate
+ depends on I2C
+ depends on SENSORS_HMC5843
+ select REGMAP_I2C
endmenu
diff --git a/drivers/staging/iio/magnetometer/Makefile b/drivers/staging/iio/magnetometer/Makefile
index f9bfb2e..65baf1c 100644
--- a/drivers/staging/iio/magnetometer/Makefile
+++ b/drivers/staging/iio/magnetometer/Makefile
@@ -2,4 +2,5 @@
# Makefile for industrial I/O Magnetometer sensors
#
-obj-$(CONFIG_SENSORS_HMC5843) += hmc5843.o
+obj-$(CONFIG_SENSORS_HMC5843) += hmc5843_core.o
+obj-$(CONFIG_SENSORS_HMC5843_I2C) += hmc5843_i2c.o
diff --git a/drivers/staging/iio/magnetometer/hmc5843.c b/drivers/staging/iio/magnetometer/hmc5843.c
deleted file mode 100644
index 1a48799..0000000
--- a/drivers/staging/iio/magnetometer/hmc5843.c
+++ /dev/null
@@ -1,701 +0,0 @@
-/* Copyright (C) 2010 Texas Instruments
- Author: Shubhrajyoti Datta <shubhrajyoti@ti.com>
- Acknowledgement: Jonathan Cameron <jic23@kernel.org> for valuable inputs.
-
- Support for HMC5883 and HMC5883L by Peter Meerwald <pmeerw@pmeerw.net>.
-
- 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
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-*/
-
-#include <linux/module.h>
-#include <linux/i2c.h>
-#include <linux/regmap.h>
-#include <linux/iio/iio.h>
-#include <linux/iio/sysfs.h>
-#include <linux/iio/trigger_consumer.h>
-#include <linux/iio/buffer.h>
-#include <linux/iio/triggered_buffer.h>
-#include <linux/delay.h>
-
-#define HMC5843_CONFIG_REG_A 0x00
-#define HMC5843_CONFIG_REG_B 0x01
-#define HMC5843_MODE_REG 0x02
-#define HMC5843_DATA_OUT_MSB_REGS 0x03
-#define HMC5843_STATUS_REG 0x09
-#define HMC5843_ID_REG 0x0a
-#define HMC5843_ID_END 0x0c
-
-enum hmc5843_ids {
- HMC5843_ID,
- HMC5883_ID,
- HMC5883L_ID,
-};
-
-/*
- * Range gain settings in (+-)Ga
- * Beware: HMC5843 and HMC5883 have different recommended sensor field
- * ranges; default corresponds to +-1.0 Ga and +-1.3 Ga, respectively
- */
-#define HMC5843_RANGE_GAIN_OFFSET 0x05
-#define HMC5843_RANGE_GAIN_DEFAULT 0x01
-#define HMC5843_RANGE_GAINS 8
-#define HMC5843_RANGE_GAIN_MASK 0xe0
-
-/* Device status */
-#define HMC5843_DATA_READY 0x01
-#define HMC5843_DATA_OUTPUT_LOCK 0x02
-
-/* Mode register configuration */
-#define HMC5843_MODE_CONVERSION_CONTINUOUS 0x00
-#define HMC5843_MODE_CONVERSION_SINGLE 0x01
-#define HMC5843_MODE_IDLE 0x02
-#define HMC5843_MODE_SLEEP 0x03
-#define HMC5843_MODE_MASK 0x03
-
-/*
- * HMC5843: Minimum data output rate
- * HMC5883: Typical data output rate
- */
-#define HMC5843_RATE_OFFSET 0x02
-#define HMC5843_RATE_DEFAULT 0x04
-#define HMC5843_RATES 7
-#define HMC5843_RATE_MASK 0x1c
-
-/* Device measurement configuration */
-#define HMC5843_MEAS_CONF_NORMAL 0x00
-#define HMC5843_MEAS_CONF_POSITIVE_BIAS 0x01
-#define HMC5843_MEAS_CONF_NEGATIVE_BIAS 0x02
-#define HMC5843_MEAS_CONF_MASK 0x03
-
-/* Scaling factors: 10000000/Gain */
-static const int hmc5843_regval_to_nanoscale[HMC5843_RANGE_GAINS] = {
- 6173, 7692, 10309, 12821, 18868, 21739, 25641, 35714
-};
-
-static const int hmc5883_regval_to_nanoscale[HMC5843_RANGE_GAINS] = {
- 7812, 9766, 13021, 16287, 24096, 27701, 32573, 45662
-};
-
-static const int hmc5883l_regval_to_nanoscale[HMC5843_RANGE_GAINS] = {
- 7299, 9174, 12195, 15152, 22727, 25641, 30303, 43478
-};
-
-/*
- * From the datasheet:
- * 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 int hmc5843_regval_to_samp_freq[7][2] = {
- {0, 500000}, {1, 0}, {2, 0}, {5, 0}, {10, 0}, {20, 0}, {50, 0}
-};
-
-static const int hmc5883_regval_to_samp_freq[7][2] = {
- {0, 750000}, {1, 500000}, {3, 0}, {7, 500000}, {15, 0}, {30, 0},
- {75, 0}
-};
-
-/* Describe chip variants */
-struct hmc5843_chip_info {
- const struct iio_chan_spec *channels;
- const int (*regval_to_samp_freq)[2];
- const int *regval_to_nanoscale;
-};
-
-/* Each client has this additional data */
-struct hmc5843_data {
- struct i2c_client *client;
- struct mutex lock;
- struct regmap *regmap;
- const struct hmc5843_chip_info *variant;
- __be16 buffer[8]; /* 3x 16-bit channels + padding + 64-bit timestamp */
-};
-
-/* The lower two bits contain the current conversion mode */
-static s32 hmc5843_set_mode(struct hmc5843_data *data, u8 operating_mode)
-{
- int ret;
-
- mutex_lock(&data->lock);
- ret = regmap_update_bits(data->regmap, HMC5843_MODE_REG,
- HMC5843_MODE_MASK, operating_mode);
- mutex_unlock(&data->lock);
-
- return ret;
-}
-
-static int hmc5843_wait_measurement(struct hmc5843_data *data)
-{
- int tries = 150;
- int val;
- int ret;
-
- while (tries-- > 0) {
- ret = regmap_read(data->regmap, HMC5843_STATUS_REG, &val);
- if (ret < 0)
- return ret;
- if (val & HMC5843_DATA_READY)
- break;
- msleep(20);
- }
-
- if (tries < 0) {
- dev_err(&data->client->dev, "data not ready\n");
- return -EIO;
- }
-
- return 0;
-}
-
-/* Return the measurement value from the specified channel */
-static int hmc5843_read_measurement(struct hmc5843_data *data,
- int idx, int *val)
-{
- __be16 values[3];
- int ret;
-
- mutex_lock(&data->lock);
- ret = hmc5843_wait_measurement(data);
- if (ret < 0) {
- mutex_unlock(&data->lock);
- return ret;
- }
- ret = regmap_bulk_read(data->regmap, HMC5843_DATA_OUT_MSB_REGS,
- values, sizeof(values));
- mutex_unlock(&data->lock);
- if (ret < 0)
- return ret;
-
- *val = sign_extend32(be16_to_cpu(values[idx]), 15);
- return IIO_VAL_INT;
-}
-
-/*
- * API for setting the measurement configuration to
- * Normal, Positive bias and Negative bias
- *
- * From the datasheet:
- * 0 - Normal measurement configuration (default): In normal measurement
- * configuration the device follows normal measurement flow. Pins BP
- * and BN are left floating and high impedance.
- *
- * 1 - Positive bias configuration: In positive bias configuration, a
- * positive current is forced across the resistive load on pins BP
- * and BN.
- *
- * 2 - Negative bias configuration. In negative bias configuration, a
- * negative current is forced across the resistive load on pins BP
- * and BN.
- *
- */
-static int hmc5843_set_meas_conf(struct hmc5843_data *data, u8 meas_conf)
-{
- int ret;
-
- mutex_lock(&data->lock);
- ret = regmap_update_bits(data->regmap, HMC5843_CONFIG_REG_A,
- HMC5843_MEAS_CONF_MASK, meas_conf);
- mutex_unlock(&data->lock);
-
- return ret;
-}
-
-static ssize_t hmc5843_show_measurement_configuration(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct hmc5843_data *data = iio_priv(dev_to_iio_dev(dev));
- int val;
- int ret;
-
- ret = regmap_read(data->regmap, HMC5843_CONFIG_REG_A, &val);
- if (ret)
- return ret;
- val &= HMC5843_MEAS_CONF_MASK;
-
- return sprintf(buf, "%d\n", val);
-}
-
-static ssize_t hmc5843_set_measurement_configuration(struct device *dev,
- struct device_attribute *attr,
- const char *buf,
- size_t count)
-{
- struct hmc5843_data *data = iio_priv(dev_to_iio_dev(dev));
- unsigned long meas_conf = 0;
- int ret;
-
- ret = kstrtoul(buf, 10, &meas_conf);
- if (ret)
- return ret;
- if (meas_conf >= HMC5843_MEAS_CONF_MASK)
- return -EINVAL;
-
- ret = hmc5843_set_meas_conf(data, meas_conf);
-
- return (ret < 0) ? ret : count;
-}
-
-static IIO_DEVICE_ATTR(meas_conf,
- S_IWUSR | S_IRUGO,
- hmc5843_show_measurement_configuration,
- hmc5843_set_measurement_configuration,
- 0);
-
-static ssize_t hmc5843_show_samp_freq_avail(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- struct hmc5843_data *data = iio_priv(dev_to_iio_dev(dev));
- size_t len = 0;
- int i;
-
- for (i = 0; i < HMC5843_RATES; i++)
- len += scnprintf(buf + len, PAGE_SIZE - len,
- "%d.%d ", data->variant->regval_to_samp_freq[i][0],
- data->variant->regval_to_samp_freq[i][1]);
-
- /* replace trailing space by newline */
- buf[len - 1] = '\n';
-
- return len;
-}
-
-static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(hmc5843_show_samp_freq_avail);
-
-static int hmc5843_set_samp_freq(struct hmc5843_data *data, u8 rate)
-{
- int ret;
-
- mutex_lock(&data->lock);
- ret = regmap_update_bits(data->regmap, HMC5843_CONFIG_REG_A,
- HMC5843_RATE_MASK, rate << HMC5843_RATE_OFFSET);
- mutex_unlock(&data->lock);
-
- return ret;
-}
-
-static int hmc5843_get_samp_freq_index(struct hmc5843_data *data,
- int val, int val2)
-{
- int i;
-
- for (i = 0; i < HMC5843_RATES; i++)
- if (val == data->variant->regval_to_samp_freq[i][0] &&
- val2 == data->variant->regval_to_samp_freq[i][1])
- return i;
-
- return -EINVAL;
-}
-
-static int hmc5843_set_range_gain(struct hmc5843_data *data, u8 range)
-{
- int ret;
-
- mutex_lock(&data->lock);
- ret = regmap_update_bits(data->regmap, HMC5843_CONFIG_REG_B,
- HMC5843_RANGE_GAIN_MASK,
- range << HMC5843_RANGE_GAIN_OFFSET);
- mutex_unlock(&data->lock);
-
- return ret;
-}
-
-static ssize_t hmc5843_show_scale_avail(struct device *dev,
- struct device_attribute *attr, char *buf)
-{
- struct hmc5843_data *data = iio_priv(dev_to_iio_dev(dev));
-
- size_t len = 0;
- int i;
-
- for (i = 0; i < HMC5843_RANGE_GAINS; i++)
- len += scnprintf(buf + len, PAGE_SIZE - len,
- "0.%09d ", data->variant->regval_to_nanoscale[i]);
-
- /* replace trailing space by newline */
- buf[len - 1] = '\n';
-
- return len;
-}
-
-static IIO_DEVICE_ATTR(scale_available, S_IRUGO,
- hmc5843_show_scale_avail, NULL, 0);
-
-static int hmc5843_get_scale_index(struct hmc5843_data *data, int val, int val2)
-{
- int i;
-
- if (val != 0)
- return -EINVAL;
-
- for (i = 0; i < HMC5843_RANGE_GAINS; i++)
- if (val2 == data->variant->regval_to_nanoscale[i])
- return i;
-
- return -EINVAL;
-}
-
-static int hmc5843_read_raw(struct iio_dev *indio_dev,
- struct iio_chan_spec const *chan,
- int *val, int *val2, long mask)
-{
- struct hmc5843_data *data = iio_priv(indio_dev);
- int rval;
- int ret;
-
- switch (mask) {
- case IIO_CHAN_INFO_RAW:
- return hmc5843_read_measurement(data, chan->scan_index, val);
- case IIO_CHAN_INFO_SCALE:
- ret = regmap_read(data->regmap, HMC5843_CONFIG_REG_B, &rval);
- if (ret < 0)
- return ret;
- *val = 0;
- *val2 = data->variant->regval_to_nanoscale[rval >> HMC5843_RANGE_GAIN_OFFSET];
- return IIO_VAL_INT_PLUS_NANO;
- case IIO_CHAN_INFO_SAMP_FREQ:
- ret = regmap_read(data->regmap, HMC5843_CONFIG_REG_A, &rval);
- if (ret < 0)
- return ret;
- rval &= HMC5843_RATE_MASK;
- *val = data->variant->regval_to_samp_freq[rval][0];
- *val2 = data->variant->regval_to_samp_freq[rval][1];
- return IIO_VAL_INT_PLUS_MICRO;
- }
- return -EINVAL;
-}
-
-static int hmc5843_write_raw(struct iio_dev *indio_dev,
- struct iio_chan_spec const *chan,
- int val, int val2, long mask)
-{
- struct hmc5843_data *data = iio_priv(indio_dev);
- int rate, range;
-
- switch (mask) {
- case IIO_CHAN_INFO_SAMP_FREQ:
- rate = hmc5843_get_samp_freq_index(data, val, val2);
- if (rate < 0)
- return -EINVAL;
-
- return hmc5843_set_samp_freq(data, rate);
- case IIO_CHAN_INFO_SCALE:
- range = hmc5843_get_scale_index(data, val, val2);
- if (range < 0)
- return -EINVAL;
-
- return hmc5843_set_range_gain(data, range);
- default:
- return -EINVAL;
- }
-}
-
-static int hmc5843_write_raw_get_fmt(struct iio_dev *indio_dev,
- struct iio_chan_spec const *chan, long mask)
-{
- switch (mask) {
- case IIO_CHAN_INFO_SAMP_FREQ:
- return IIO_VAL_INT_PLUS_MICRO;
- case IIO_CHAN_INFO_SCALE:
- return IIO_VAL_INT_PLUS_NANO;
- default:
- return -EINVAL;
- }
-}
-
-static irqreturn_t hmc5843_trigger_handler(int irq, void *p)
-{
- struct iio_poll_func *pf = p;
- struct iio_dev *indio_dev = pf->indio_dev;
- struct hmc5843_data *data = iio_priv(indio_dev);
- int ret;
-
- mutex_lock(&data->lock);
- ret = hmc5843_wait_measurement(data);
- if (ret < 0) {
- mutex_unlock(&data->lock);
- goto done;
- }
-
- ret = regmap_bulk_read(data->regmap, HMC5843_DATA_OUT_MSB_REGS,
- data->buffer, 3 * sizeof(__be16));
-
- mutex_unlock(&data->lock);
- if (ret < 0)
- goto done;
-
- iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
- iio_get_time_ns());
-
-done:
- iio_trigger_notify_done(indio_dev->trig);
-
- return IRQ_HANDLED;
-}
-
-#define HMC5843_CHANNEL(axis, idx) \
- { \
- .type = IIO_MAGN, \
- .modified = 1, \
- .channel2 = IIO_MOD_##axis, \
- .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
- .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \
- BIT(IIO_CHAN_INFO_SAMP_FREQ), \
- .scan_index = idx, \
- .scan_type = { \
- .sign = 's', \
- .realbits = 16, \
- .storagebits = 16, \
- .endianness = IIO_BE, \
- }, \
- }
-
-static const struct iio_chan_spec hmc5843_channels[] = {
- HMC5843_CHANNEL(X, 0),
- HMC5843_CHANNEL(Y, 1),
- HMC5843_CHANNEL(Z, 2),
- IIO_CHAN_SOFT_TIMESTAMP(3),
-};
-
-/* Beware: Y and Z are exchanged on HMC5883 */
-static const struct iio_chan_spec hmc5883_channels[] = {
- HMC5843_CHANNEL(X, 0),
- HMC5843_CHANNEL(Z, 1),
- HMC5843_CHANNEL(Y, 2),
- IIO_CHAN_SOFT_TIMESTAMP(3),
-};
-
-static struct attribute *hmc5843_attributes[] = {
- &iio_dev_attr_meas_conf.dev_attr.attr,
- &iio_dev_attr_scale_available.dev_attr.attr,
- &iio_dev_attr_sampling_frequency_available.dev_attr.attr,
- NULL
-};
-
-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,
- .regval_to_samp_freq = hmc5843_regval_to_samp_freq,
- .regval_to_nanoscale = hmc5843_regval_to_nanoscale,
- },
- [HMC5883_ID] = {
- .channels = hmc5883_channels,
- .regval_to_samp_freq = hmc5883_regval_to_samp_freq,
- .regval_to_nanoscale = hmc5883_regval_to_nanoscale,
- },
- [HMC5883L_ID] = {
- .channels = hmc5883_channels,
- .regval_to_samp_freq = hmc5883_regval_to_samp_freq,
- .regval_to_nanoscale = hmc5883l_regval_to_nanoscale,
- },
-};
-
-static int hmc5843_init(struct hmc5843_data *data)
-{
- int ret;
- u8 id[3];
-
- ret = regmap_bulk_read(data->regmap, HMC5843_ID_REG,
- id, ARRAY_SIZE(id));
- if (ret < 0)
- return ret;
- if (id[0] != 'H' || id[1] != '4' || id[2] != '3') {
- dev_err(&data->client->dev, "no HMC5843/5883/5883L sensor\n");
- return -ENODEV;
- }
-
- ret = hmc5843_set_meas_conf(data, HMC5843_MEAS_CONF_NORMAL);
- if (ret < 0)
- return ret;
- ret = hmc5843_set_samp_freq(data, HMC5843_RATE_DEFAULT);
- if (ret < 0)
- return ret;
- ret = hmc5843_set_range_gain(data, HMC5843_RANGE_GAIN_DEFAULT);
- if (ret < 0)
- return ret;
- return hmc5843_set_mode(data, HMC5843_MODE_CONVERSION_CONTINUOUS);
-}
-
-static const struct iio_info hmc5843_info = {
- .attrs = &hmc5843_group,
- .read_raw = &hmc5843_read_raw,
- .write_raw = &hmc5843_write_raw,
- .write_raw_get_fmt = &hmc5843_write_raw_get_fmt,
- .driver_module = THIS_MODULE,
-};
-
-static const unsigned long hmc5843_scan_masks[] = {0x7, 0};
-
-static const struct regmap_range hmc5843_readable_ranges[] = {
- regmap_reg_range(0, HMC5843_ID_END),
-};
-
-static struct regmap_access_table hmc5843_readable_table = {
- .yes_ranges = hmc5843_readable_ranges,
- .n_yes_ranges = ARRAY_SIZE(hmc5843_readable_ranges),
-};
-
-static const struct regmap_range hmc5843_writable_ranges[] = {
- regmap_reg_range(0, HMC5843_MODE_REG),
-};
-
-static struct regmap_access_table hmc5843_writable_table = {
- .yes_ranges = hmc5843_writable_ranges,
- .n_yes_ranges = ARRAY_SIZE(hmc5843_writable_ranges),
-};
-
-static const struct regmap_range hmc5843_volatile_ranges[] = {
- regmap_reg_range(HMC5843_DATA_OUT_MSB_REGS, HMC5843_STATUS_REG),
-};
-
-static struct regmap_access_table hmc5843_volatile_table = {
- .yes_ranges = hmc5843_volatile_ranges,
- .n_yes_ranges = ARRAY_SIZE(hmc5843_volatile_ranges),
-};
-
-static struct regmap_config hmc5843_regmap_config = {
- .reg_bits = 8,
- .val_bits = 8,
-
- .rd_table = &hmc5843_readable_table,
- .wr_table = &hmc5843_writable_table,
- .volatile_table = &hmc5843_volatile_table,
-
- .cache_type = REGCACHE_RBTREE,
-};
-
-static int hmc5843_probe(struct i2c_client *client,
- const struct i2c_device_id *id)
-{
- struct hmc5843_data *data;
- struct iio_dev *indio_dev;
- int ret;
-
- indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
- if (indio_dev == NULL)
- return -ENOMEM;
-
- /* default settings at probe */
- data = iio_priv(indio_dev);
- data->client = client;
- data->variant = &hmc5843_chip_info_tbl[id->driver_data];
- data->regmap = devm_regmap_init_i2c(client, &hmc5843_regmap_config);
- mutex_init(&data->lock);
-
- i2c_set_clientdata(client, indio_dev);
- indio_dev->info = &hmc5843_info;
- indio_dev->name = id->name;
- indio_dev->dev.parent = &client->dev;
- indio_dev->modes = INDIO_DIRECT_MODE;
- indio_dev->channels = data->variant->channels;
- indio_dev->num_channels = 4;
- indio_dev->available_scan_masks = hmc5843_scan_masks;
-
- ret = hmc5843_init(data);
- if (ret < 0)
- return ret;
-
- ret = iio_triggered_buffer_setup(indio_dev, NULL,
- hmc5843_trigger_handler, NULL);
- if (ret < 0)
- return ret;
-
- ret = iio_device_register(indio_dev);
- if (ret < 0)
- goto buffer_cleanup;
-
- return 0;
-
-buffer_cleanup:
- iio_triggered_buffer_cleanup(indio_dev);
- return ret;
-}
-
-static int hmc5843_remove(struct i2c_client *client)
-{
- struct iio_dev *indio_dev = i2c_get_clientdata(client);
-
- iio_device_unregister(indio_dev);
- iio_triggered_buffer_cleanup(indio_dev);
-
- /* sleep mode to save power */
- hmc5843_set_mode(iio_priv(indio_dev), HMC5843_MODE_SLEEP);
-
- return 0;
-}
-
-#ifdef CONFIG_PM_SLEEP
-static int hmc5843_suspend(struct device *dev)
-{
- struct hmc5843_data *data = iio_priv(i2c_get_clientdata(
- to_i2c_client(dev)));
-
- return hmc5843_set_mode(data, HMC5843_MODE_SLEEP);
-}
-
-static int hmc5843_resume(struct device *dev)
-{
- struct hmc5843_data *data = iio_priv(i2c_get_clientdata(
- to_i2c_client(dev)));
-
- return hmc5843_set_mode(data, HMC5843_MODE_CONVERSION_CONTINUOUS);
-}
-
-static SIMPLE_DEV_PM_OPS(hmc5843_pm_ops, hmc5843_suspend, hmc5843_resume);
-#define HMC5843_PM_OPS (&hmc5843_pm_ops)
-#else
-#define HMC5843_PM_OPS NULL
-#endif
-
-static const struct i2c_device_id hmc5843_id[] = {
- { "hmc5843", HMC5843_ID },
- { "hmc5883", HMC5883_ID },
- { "hmc5883l", HMC5883L_ID },
- { }
-};
-MODULE_DEVICE_TABLE(i2c, hmc5843_id);
-
-static const struct of_device_id hmc5843_of_match[] = {
- { .compatible = "honeywell,hmc5843" },
- {}
-};
-MODULE_DEVICE_TABLE(of, hmc5843_of_match);
-
-static struct i2c_driver hmc5843_driver = {
- .driver = {
- .name = "hmc5843",
- .pm = HMC5843_PM_OPS,
- .of_match_table = hmc5843_of_match,
- },
- .id_table = hmc5843_id,
- .probe = hmc5843_probe,
- .remove = hmc5843_remove,
-};
-module_i2c_driver(hmc5843_driver);
-
-MODULE_AUTHOR("Shubhrajyoti Datta <shubhrajyoti@ti.com>");
-MODULE_DESCRIPTION("HMC5843/5883/5883L driver");
-MODULE_LICENSE("GPL");
diff --git a/drivers/staging/iio/magnetometer/hmc5843.h b/drivers/staging/iio/magnetometer/hmc5843.h
new file mode 100644
index 0000000..4e3cce3
--- /dev/null
+++ b/drivers/staging/iio/magnetometer/hmc5843.h
@@ -0,0 +1,75 @@
+/*
+ * Header file for hmc5843 driver
+ *
+ * Split from hmc5843.c
+ * Copyright (C) Josef Gajdusek <atx@atx.name>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * */
+
+
+#ifndef HMC5843_CORE_H
+#define HMC5843_CORE_H
+
+#include <linux/regmap.h>
+#include <linux/iio/iio.h>
+
+#define HMC5843_CONFIG_REG_A 0x00
+#define HMC5843_CONFIG_REG_B 0x01
+#define HMC5843_MODE_REG 0x02
+#define HMC5843_DATA_OUT_MSB_REGS 0x03
+#define HMC5843_STATUS_REG 0x09
+#define HMC5843_ID_REG 0x0a
+#define HMC5843_ID_END 0x0c
+
+enum hmc5843_ids {
+ HMC5843_ID,
+ HMC5883_ID,
+ HMC5883L_ID,
+};
+
+struct hmc5843_data {
+ struct device *dev;
+ struct mutex lock;
+ struct regmap *regmap;
+ const struct hmc5843_chip_info *variant;
+ __be16 buffer[8]; /* 3x 16-bit channels + padding + 64-bit timestamp */
+};
+
+int hmc5843_common_probe(struct iio_dev *indio_dev, enum hmc5843_ids id);
+int hmc5843_common_remove(struct iio_dev *indio_dev);
+
+int hmc5843_common_suspend(struct iio_dev *indio_dev);
+int hmc5843_common_resume(struct iio_dev *indio_dev);
+
+static const struct regmap_range hmc5843_readable_ranges[] = {
+ regmap_reg_range(0, HMC5843_ID_END),
+};
+
+static struct regmap_access_table hmc5843_readable_table = {
+ .yes_ranges = hmc5843_readable_ranges,
+ .n_yes_ranges = ARRAY_SIZE(hmc5843_readable_ranges),
+};
+
+static const struct regmap_range hmc5843_writable_ranges[] = {
+ regmap_reg_range(0, HMC5843_MODE_REG),
+};
+
+static struct regmap_access_table hmc5843_writable_table = {
+ .yes_ranges = hmc5843_writable_ranges,
+ .n_yes_ranges = ARRAY_SIZE(hmc5843_writable_ranges),
+};
+
+static const struct regmap_range hmc5843_volatile_ranges[] = {
+ regmap_reg_range(HMC5843_DATA_OUT_MSB_REGS, HMC5843_STATUS_REG),
+};
+
+static struct regmap_access_table hmc5843_volatile_table = {
+ .yes_ranges = hmc5843_volatile_ranges,
+ .n_yes_ranges = ARRAY_SIZE(hmc5843_volatile_ranges),
+};
+
+#endif /* HMC5843_CORE_H */
diff --git a/drivers/staging/iio/magnetometer/hmc5843_core.c b/drivers/staging/iio/magnetometer/hmc5843_core.c
new file mode 100644
index 0000000..efabca5
--- /dev/null
+++ b/drivers/staging/iio/magnetometer/hmc5843_core.c
@@ -0,0 +1,600 @@
+/* Copyright (C) 2010 Texas Instruments
+ Author: Shubhrajyoti Datta <shubhrajyoti@ti.com>
+ Acknowledgement: Jonathan Cameron <jic23@kernel.org> for valuable inputs.
+
+ Support for HMC5883 and HMC5883L by Peter Meerwald <pmeerw@pmeerw.net>.
+
+ Split to multiple files by Josef Gajdusek <atx@atx.name> - 2014
+
+ 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
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+#include <linux/iio/trigger_consumer.h>
+#include <linux/iio/buffer.h>
+#include <linux/iio/triggered_buffer.h>
+#include <linux/delay.h>
+
+#include "hmc5843.h"
+
+/*
+ * Range gain settings in (+-)Ga
+ * Beware: HMC5843 and HMC5883 have different recommended sensor field
+ * ranges; default corresponds to +-1.0 Ga and +-1.3 Ga, respectively
+ */
+#define HMC5843_RANGE_GAIN_OFFSET 0x05
+#define HMC5843_RANGE_GAIN_DEFAULT 0x01
+#define HMC5843_RANGE_GAINS 8
+#define HMC5843_RANGE_GAIN_MASK 0xe0
+
+/* Device status */
+#define HMC5843_DATA_READY 0x01
+#define HMC5843_DATA_OUTPUT_LOCK 0x02
+
+/* Mode register configuration */
+#define HMC5843_MODE_CONVERSION_CONTINUOUS 0x00
+#define HMC5843_MODE_CONVERSION_SINGLE 0x01
+#define HMC5843_MODE_IDLE 0x02
+#define HMC5843_MODE_SLEEP 0x03
+#define HMC5843_MODE_MASK 0x03
+
+/*
+ * HMC5843: Minimum data output rate
+ * HMC5883: Typical data output rate
+ */
+#define HMC5843_RATE_OFFSET 0x02
+#define HMC5843_RATE_DEFAULT 0x04
+#define HMC5843_RATES 7
+#define HMC5843_RATE_MASK 0x1c
+
+/* Device measurement configuration */
+#define HMC5843_MEAS_CONF_NORMAL 0x00
+#define HMC5843_MEAS_CONF_POSITIVE_BIAS 0x01
+#define HMC5843_MEAS_CONF_NEGATIVE_BIAS 0x02
+#define HMC5843_MEAS_CONF_MASK 0x03
+
+/* Scaling factors: 10000000/Gain */
+static const int hmc5843_regval_to_nanoscale[HMC5843_RANGE_GAINS] = {
+ 6173, 7692, 10309, 12821, 18868, 21739, 25641, 35714
+};
+
+static const int hmc5883_regval_to_nanoscale[HMC5843_RANGE_GAINS] = {
+ 7812, 9766, 13021, 16287, 24096, 27701, 32573, 45662
+};
+
+static const int hmc5883l_regval_to_nanoscale[HMC5843_RANGE_GAINS] = {
+ 7299, 9174, 12195, 15152, 22727, 25641, 30303, 43478
+};
+
+/*
+ *
+ * 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 int hmc5843_regval_to_samp_freq[7][2] = {
+ {0, 500000}, {1, 0}, {2, 0}, {5, 0}, {10, 0}, {20, 0}, {50, 0}
+};
+
+static const int hmc5883_regval_to_samp_freq[7][2] = {
+ {0, 750000}, {1, 500000}, {3, 0}, {7, 500000}, {15, 0}, {30, 0},
+ {75, 0}
+};
+
+/* Describe chip variants */
+struct hmc5843_chip_info {
+ const struct iio_chan_spec *channels;
+ const int (*regval_to_samp_freq)[2];
+ const int *regval_to_nanoscale;
+};
+
+/* The lower two bits contain the current conversion mode */
+static s32 hmc5843_set_mode(struct hmc5843_data *data, u8 operating_mode)
+{
+ int ret;
+
+ mutex_lock(&data->lock);
+ ret = regmap_update_bits(data->regmap, HMC5843_MODE_REG,
+ HMC5843_MODE_MASK, operating_mode);
+ mutex_unlock(&data->lock);
+
+ return ret;
+}
+
+static int hmc5843_wait_measurement(struct hmc5843_data *data)
+{
+ int tries = 150;
+ int val;
+ int ret;
+
+ while (tries-- > 0) {
+ ret = regmap_read(data->regmap, HMC5843_STATUS_REG, &val);
+ if (ret < 0)
+ return ret;
+ if (val & HMC5843_DATA_READY)
+ break;
+ msleep(20);
+ }
+
+ if (tries < 0) {
+ dev_err(data->dev, "data not ready\n");
+ return -EIO;
+ }
+
+ return 0;
+}
+
+/* Return the measurement value from the specified channel */
+static int hmc5843_read_measurement(struct hmc5843_data *data,
+ int idx, int *val)
+{
+ __be16 values[3];
+ int ret;
+
+ mutex_lock(&data->lock);
+ ret = hmc5843_wait_measurement(data);
+ if (ret < 0) {
+ mutex_unlock(&data->lock);
+ return ret;
+ }
+ ret = regmap_bulk_read(data->regmap, HMC5843_DATA_OUT_MSB_REGS,
+ values, sizeof(values));
+ mutex_unlock(&data->lock);
+ if (ret < 0)
+ return ret;
+
+ *val = sign_extend32(be16_to_cpu(values[idx]), 15);
+ return IIO_VAL_INT;
+}
+
+/*
+ * API for setting the measurement configuration to
+ * Normal, Positive bias and Negative bias
+ *
+ *
+ * 0 - Normal measurement configuration (default): In normal measurement
+ * configuration the device follows normal measurement flow. Pins BP
+ * and BN are left floating and high impedance.
+ *
+ * 1 - Positive bias configuration: In positive bias configuration, a
+ * positive current is forced across the resistive load on pins BP
+ * and BN.
+ *
+ * 2 - Negative bias configuration. In negative bias configuration, a
+ * negative current is forced across the resistive load on pins BP
+ * and BN.
+ *
+ */
+static int hmc5843_set_meas_conf(struct hmc5843_data *data, u8 meas_conf)
+{
+ int ret;
+
+ mutex_lock(&data->lock);
+ ret = regmap_update_bits(data->regmap, HMC5843_CONFIG_REG_A,
+ HMC5843_MEAS_CONF_MASK, meas_conf);
+ mutex_unlock(&data->lock);
+
+ return ret;
+}
+
+static ssize_t hmc5843_show_measurement_configuration(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct hmc5843_data *data = iio_priv(dev_to_iio_dev(dev));
+ int val;
+ int ret;
+
+ ret = regmap_read(data->regmap, HMC5843_CONFIG_REG_A, &val);
+ if (ret)
+ return ret;
+ val &= HMC5843_MEAS_CONF_MASK;
+
+ return sprintf(buf, "%d\n", val);
+}
+
+static ssize_t hmc5843_set_measurement_configuration(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf,
+ size_t count)
+{
+ struct hmc5843_data *data = iio_priv(dev_to_iio_dev(dev));
+ unsigned long meas_conf = 0;
+ int ret;
+
+ ret = kstrtoul(buf, 10, &meas_conf);
+ if (ret)
+ return ret;
+ if (meas_conf >= HMC5843_MEAS_CONF_MASK)
+ return -EINVAL;
+
+ ret = hmc5843_set_meas_conf(data, meas_conf);
+
+ return (ret < 0) ? ret : count;
+}
+
+static IIO_DEVICE_ATTR(meas_conf,
+ S_IWUSR | S_IRUGO,
+ hmc5843_show_measurement_configuration,
+ hmc5843_set_measurement_configuration,
+ 0);
+
+static ssize_t hmc5843_show_samp_freq_avail(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct hmc5843_data *data = iio_priv(dev_to_iio_dev(dev));
+ size_t len = 0;
+ int i;
+
+ for (i = 0; i < HMC5843_RATES; i++)
+ len += scnprintf(buf + len, PAGE_SIZE - len,
+ "%d.%d ", data->variant->regval_to_samp_freq[i][0],
+ data->variant->regval_to_samp_freq[i][1]);
+
+ /* replace trailing space by newline */
+ buf[len - 1] = '\n';
+
+ return len;
+}
+
+static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(hmc5843_show_samp_freq_avail);
+
+static int hmc5843_set_samp_freq(struct hmc5843_data *data, u8 rate)
+{
+ int ret;
+
+ mutex_lock(&data->lock);
+ ret = regmap_update_bits(data->regmap, HMC5843_CONFIG_REG_A,
+ HMC5843_RATE_MASK, rate << HMC5843_RATE_OFFSET);
+ mutex_unlock(&data->lock);
+
+ return ret;
+}
+
+static int hmc5843_get_samp_freq_index(struct hmc5843_data *data,
+ int val, int val2)
+{
+ int i;
+
+ for (i = 0; i < HMC5843_RATES; i++)
+ if (val == data->variant->regval_to_samp_freq[i][0] &&
+ val2 == data->variant->regval_to_samp_freq[i][1])
+ return i;
+
+ return -EINVAL;
+}
+
+static int hmc5843_set_range_gain(struct hmc5843_data *data, u8 range)
+{
+ int ret;
+
+ mutex_lock(&data->lock);
+ ret = regmap_update_bits(data->regmap, HMC5843_CONFIG_REG_B,
+ HMC5843_RANGE_GAIN_MASK,
+ range << HMC5843_RANGE_GAIN_OFFSET);
+ mutex_unlock(&data->lock);
+
+ return ret;
+}
+
+static ssize_t hmc5843_show_scale_avail(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct hmc5843_data *data = iio_priv(dev_to_iio_dev(dev));
+
+ size_t len = 0;
+ int i;
+
+ for (i = 0; i < HMC5843_RANGE_GAINS; i++)
+ len += scnprintf(buf + len, PAGE_SIZE - len,
+ "0.%09d ", data->variant->regval_to_nanoscale[i]);
+
+ /* replace trailing space by newline */
+ buf[len - 1] = '\n';
+
+ return len;
+}
+
+static IIO_DEVICE_ATTR(scale_available, S_IRUGO,
+ hmc5843_show_scale_avail, NULL, 0);
+
+static int hmc5843_get_scale_index(struct hmc5843_data *data, int val, int val2)
+{
+ int i;
+
+ if (val != 0)
+ return -EINVAL;
+
+ for (i = 0; i < HMC5843_RANGE_GAINS; i++)
+ if (val2 == data->variant->regval_to_nanoscale[i])
+ return i;
+
+ return -EINVAL;
+}
+
+static int hmc5843_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2, long mask)
+{
+ struct hmc5843_data *data = iio_priv(indio_dev);
+ int rval;
+ int ret;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ return hmc5843_read_measurement(data, chan->scan_index, val);
+ case IIO_CHAN_INFO_SCALE:
+ ret = regmap_read(data->regmap, HMC5843_CONFIG_REG_B, &rval);
+ if (ret < 0)
+ return ret;
+ rval >>= HMC5843_RANGE_GAIN_OFFSET;
+ *val = 0;
+ *val2 = data->variant->regval_to_nanoscale[rval];
+ return IIO_VAL_INT_PLUS_NANO;
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ ret = regmap_read(data->regmap, HMC5843_CONFIG_REG_A, &rval);
+ if (ret < 0)
+ return ret;
+ rval >>= HMC5843_RATE_OFFSET;
+ *val = data->variant->regval_to_samp_freq[rval][0];
+ *val2 = data->variant->regval_to_samp_freq[rval][1];
+ return IIO_VAL_INT_PLUS_MICRO;
+ }
+ return -EINVAL;
+}
+
+static int hmc5843_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int val, int val2, long mask)
+{
+ struct hmc5843_data *data = iio_priv(indio_dev);
+ int rate, range;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ rate = hmc5843_get_samp_freq_index(data, val, val2);
+ if (rate < 0)
+ return -EINVAL;
+
+ return hmc5843_set_samp_freq(data, rate);
+ case IIO_CHAN_INFO_SCALE:
+ range = hmc5843_get_scale_index(data, val, val2);
+ if (range < 0)
+ return -EINVAL;
+
+ return hmc5843_set_range_gain(data, range);
+ default:
+ return -EINVAL;
+ }
+}
+
+static int hmc5843_write_raw_get_fmt(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan, long mask)
+{
+ switch (mask) {
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ return IIO_VAL_INT_PLUS_MICRO;
+ case IIO_CHAN_INFO_SCALE:
+ return IIO_VAL_INT_PLUS_NANO;
+ default:
+ return -EINVAL;
+ }
+}
+
+static irqreturn_t hmc5843_trigger_handler(int irq, void *p)
+{
+ struct iio_poll_func *pf = p;
+ struct iio_dev *indio_dev = pf->indio_dev;
+ struct hmc5843_data *data = iio_priv(indio_dev);
+ int ret;
+
+ mutex_lock(&data->lock);
+ ret = hmc5843_wait_measurement(data);
+ if (ret < 0) {
+ mutex_unlock(&data->lock);
+ goto done;
+ }
+
+ ret = regmap_bulk_read(data->regmap, HMC5843_DATA_OUT_MSB_REGS,
+ data->buffer, 3 * sizeof(__be16));
+
+ mutex_unlock(&data->lock);
+ if (ret < 0)
+ goto done;
+
+ iio_push_to_buffers_with_timestamp(indio_dev, data->buffer,
+ iio_get_time_ns());
+
+done:
+ iio_trigger_notify_done(indio_dev->trig);
+
+ return IRQ_HANDLED;
+}
+
+#define HMC5843_CHANNEL(axis, idx) \
+ { \
+ .type = IIO_MAGN, \
+ .modified = 1, \
+ .channel2 = IIO_MOD_##axis, \
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE) | \
+ BIT(IIO_CHAN_INFO_SAMP_FREQ), \
+ .scan_index = idx, \
+ .scan_type = { \
+ .sign = 's', \
+ .realbits = 16, \
+ .storagebits = 16, \
+ .endianness = IIO_BE, \
+ }, \
+ }
+
+static const struct iio_chan_spec hmc5843_channels[] = {
+ HMC5843_CHANNEL(X, 0),
+ HMC5843_CHANNEL(Y, 1),
+ HMC5843_CHANNEL(Z, 2),
+ IIO_CHAN_SOFT_TIMESTAMP(3),
+};
+
+/* Beware: Y and Z are exchanged on HMC5883 */
+static const struct iio_chan_spec hmc5883_channels[] = {
+ HMC5843_CHANNEL(X, 0),
+ HMC5843_CHANNEL(Z, 1),
+ HMC5843_CHANNEL(Y, 2),
+ IIO_CHAN_SOFT_TIMESTAMP(3),
+};
+
+static struct attribute *hmc5843_attributes[] = {
+ &iio_dev_attr_meas_conf.dev_attr.attr,
+ &iio_dev_attr_scale_available.dev_attr.attr,
+ &iio_dev_attr_sampling_frequency_available.dev_attr.attr,
+ NULL
+};
+
+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,
+ .regval_to_samp_freq = hmc5843_regval_to_samp_freq,
+ .regval_to_nanoscale = hmc5843_regval_to_nanoscale,
+ },
+ [HMC5883_ID] = {
+ .channels = hmc5883_channels,
+ .regval_to_samp_freq = hmc5883_regval_to_samp_freq,
+ .regval_to_nanoscale = hmc5883_regval_to_nanoscale,
+ },
+ [HMC5883L_ID] = {
+ .channels = hmc5883_channels,
+ .regval_to_samp_freq = hmc5883_regval_to_samp_freq,
+ .regval_to_nanoscale = hmc5883l_regval_to_nanoscale,
+ },
+};
+
+static int hmc5843_init(struct hmc5843_data *data)
+{
+ int ret;
+ u8 id[3];
+
+ ret = regmap_bulk_read(data->regmap, HMC5843_ID_REG,
+ id, ARRAY_SIZE(id));
+ if (ret < 0)
+ return ret;
+ if (id[0] != 'H' || id[1] != '4' || id[2] != '3') {
+ dev_err(data->dev, "no HMC5843/5883/5883L sensor\n");
+ return -ENODEV;
+ }
+
+ ret = hmc5843_set_meas_conf(data, HMC5843_MEAS_CONF_NORMAL);
+ if (ret < 0)
+ return ret;
+ ret = hmc5843_set_samp_freq(data, HMC5843_RATE_DEFAULT);
+ if (ret < 0)
+ return ret;
+ ret = hmc5843_set_range_gain(data, HMC5843_RANGE_GAIN_DEFAULT);
+ if (ret < 0)
+ return ret;
+ return hmc5843_set_mode(data, HMC5843_MODE_CONVERSION_CONTINUOUS);
+}
+
+static const struct iio_info hmc5843_info = {
+ .attrs = &hmc5843_group,
+ .read_raw = &hmc5843_read_raw,
+ .write_raw = &hmc5843_write_raw,
+ .write_raw_get_fmt = &hmc5843_write_raw_get_fmt,
+ .driver_module = THIS_MODULE,
+};
+
+static const unsigned long hmc5843_scan_masks[] = {0x7, 0};
+
+
+int hmc5843_common_suspend(struct iio_dev *indio_dev)
+{
+ return hmc5843_set_mode(iio_priv(indio_dev),
+ HMC5843_MODE_CONVERSION_CONTINUOUS);
+}
+EXPORT_SYMBOL(hmc5843_common_suspend);
+
+int hmc5843_common_resume(struct iio_dev *indio_dev)
+{
+ return hmc5843_set_mode(iio_priv(indio_dev), HMC5843_MODE_SLEEP);
+}
+EXPORT_SYMBOL(hmc5843_common_resume);
+
+int hmc5843_common_probe(struct iio_dev *indio_dev, enum hmc5843_ids id)
+{
+ struct hmc5843_data *data;
+ int ret;
+
+ /* default settings at probe */
+ data = iio_priv(indio_dev);
+ data->variant = &hmc5843_chip_info_tbl[id];
+ mutex_init(&data->lock);
+
+ indio_dev->info = &hmc5843_info;
+ indio_dev->modes = INDIO_DIRECT_MODE;
+ indio_dev->channels = data->variant->channels;
+ indio_dev->num_channels = 4;
+ indio_dev->available_scan_masks = hmc5843_scan_masks;
+
+ ret = hmc5843_init(data);
+ if (ret < 0)
+ return ret;
+
+ ret = iio_triggered_buffer_setup(indio_dev, NULL,
+ hmc5843_trigger_handler, NULL);
+ if (ret < 0)
+ return ret;
+
+ ret = iio_device_register(indio_dev);
+ if (ret < 0)
+ goto buffer_cleanup;
+
+ return 0;
+
+buffer_cleanup:
+ iio_triggered_buffer_cleanup(indio_dev);
+ return ret;
+}
+EXPORT_SYMBOL(hmc5843_common_probe);
+
+int hmc5843_common_remove(struct iio_dev *indio_dev)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(client);
+
+ iio_device_unregister(indio_dev);
+ iio_triggered_buffer_cleanup(indio_dev);
+
+ /* sleep mode to save power */
+ hmc5843_set_mode(iio_priv(indio_dev), HMC5843_MODE_SLEEP);
+
+ return 0;
+}
+EXPORT_SYMBOL(hmc5843_common_remove);
+
+MODULE_AUTHOR("Shubhrajyoti Datta <shubhrajyoti@ti.com>");
+MODULE_DESCRIPTION("HMC5843/5883/5883L core driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/staging/iio/magnetometer/hmc5843_i2c.c b/drivers/staging/iio/magnetometer/hmc5843_i2c.c
new file mode 100644
index 0000000..b3c92d9
--- /dev/null
+++ b/drivers/staging/iio/magnetometer/hmc5843_i2c.c
@@ -0,0 +1,106 @@
+/*
+ * i2c driver for hmc5843/5843/5883/5883l
+ *
+ * Split from hmc5843.c
+ * Copyright (C) Josef Gajdusek <atx@atx.name>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * */
+
+#include <linux/module.h>
+#include <linux/i2c.h>
+#include <linux/regmap.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/triggered_buffer.h>
+
+#include "hmc5843.h"
+
+struct regmap_config hmc5843_i2c_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+
+ .rd_table = &hmc5843_readable_table,
+ .wr_table = &hmc5843_writable_table,
+ .volatile_table = &hmc5843_volatile_table,
+
+ .cache_type = REGCACHE_RBTREE,
+};
+
+static int hmc5843_i2c_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct hmc5843_data *data;
+ struct iio_dev *indio_dev;
+
+ indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
+ if (indio_dev == NULL)
+ return -ENOMEM;
+
+ i2c_set_clientdata(client, indio_dev);
+
+ data = iio_priv(indio_dev);
+ data->dev = &client->dev;
+ data->regmap = devm_regmap_init_i2c(client, &hmc5843_i2c_regmap_config);
+
+ indio_dev->name = id->name;
+ indio_dev->dev.parent = &client->dev;
+
+ return hmc5843_common_probe(indio_dev, id->driver_data);
+}
+
+static int hmc5843_i2c_remove(struct i2c_client *client)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(client);
+ return hmc5843_common_remove(indio_dev);
+}
+
+#ifdef CONFIG_PM_SLEEP
+static int hmc5843_i2c_suspend(struct device *dev)
+{
+ return hmc5843_common_suspend(i2c_get_clientdata(to_i2c_client(dev)));
+}
+
+static int hmc5843_i2c_resume(struct device *dev)
+{
+ return hmc5843_common_resume(i2c_get_clientdata(to_i2c_client(dev)));
+}
+
+static SIMPLE_DEV_PM_OPS(hmc5843_pm_ops,
+ hmc5843_i2c_suspend, hmc5843_i2c_resume);
+#define HMC5843_PM_OPS (&hmc5843_pm_ops)
+#else
+#define HMC5843_PM_OPS NULL
+#endif
+
+static const struct i2c_device_id hmc5843_id[] = {
+ { "hmc5843", HMC5843_ID },
+ { "hmc5883", HMC5883_ID },
+ { "hmc5883l", HMC5883L_ID },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, hmc5843_id);
+
+static const struct of_device_id hmc5843_of_match[] = {
+ { .compatible = "honeywell,hmc5843" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, hmc5843_of_match);
+
+static struct i2c_driver hmc5843_driver = {
+ .driver = {
+ .name = "hmc5843",
+ .pm = HMC5843_PM_OPS,
+ .of_match_table = hmc5843_of_match,
+ },
+ .id_table = hmc5843_id,
+ .probe = hmc5843_i2c_probe,
+ .remove = hmc5843_i2c_remove,
+};
+module_i2c_driver(hmc5843_driver);
+
+MODULE_AUTHOR("Josef Gajdusek <atx@atx.name>");
+MODULE_DESCRIPTION("HMC5843/5883/5883L i2c driver");
+MODULE_LICENSE("GPL");
--
1.8.5.5
^ permalink raw reply related [flat|nested] 8+ messages in thread