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iio: magnetometer: ak8974: support AMI306 variant

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Add support for AMI306 magnetometer - very similar to AMI305.

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Michał Mirosław 2017-08-17 15:56:10 +02:00 committed by Jonathan Cameron
parent 3282fa3c0a
commit 21be26fc67
2 changed files with 72 additions and 22 deletions
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4
drivers/iio/magnetometer/Kconfig
View File

@ -13,8 +13,8 @@ config AK8974
select IIO_BUFFER
select IIO_TRIGGERED_BUFFER
help
Say yes here to build support for Asahi Kasei AK8974 or
AMI305 I2C-based 3-axis magnetometer chips.
Say yes here to build support for Asahi Kasei AK8974, AMI305 or
AMI306 I2C-based 3-axis magnetometer chips.
To compile this driver as a module, choose M here: the module
will be called ak8974.

90
drivers/iio/magnetometer/ak8974.c
View File

@ -36,7 +36,7 @@
* and MSB is at the next higher address.
*/
/* These registers are common for AK8974 and AMI305 */
/* These registers are common for AK8974 and AMI30x */
#define AK8974_SELFTEST 0x0C
#define AK8974_SELFTEST_IDLE 0x55
#define AK8974_SELFTEST_OK 0xAA
@ -44,6 +44,7 @@
#define AK8974_INFO 0x0D
#define AK8974_WHOAMI 0x0F
#define AK8974_WHOAMI_VALUE_AMI306 0x46
#define AK8974_WHOAMI_VALUE_AMI305 0x47
#define AK8974_WHOAMI_VALUE_AK8974 0x48
@ -73,6 +74,35 @@
#define AK8974_TEMP 0x31
#define AMI305_TEMP 0x60
/* AMI306-specific control register */
#define AMI306_CTRL4 0x5C
/* AMI306 factory calibration data */
/* fine axis sensitivity */
#define AMI306_FINEOUTPUT_X 0x90
#define AMI306_FINEOUTPUT_Y 0x92
#define AMI306_FINEOUTPUT_Z 0x94
/* axis sensitivity */
#define AMI306_SENS_X 0x96
#define AMI306_SENS_Y 0x98
#define AMI306_SENS_Z 0x9A
/* axis cross-interference */
#define AMI306_GAIN_PARA_XZ 0x9C
#define AMI306_GAIN_PARA_XY 0x9D
#define AMI306_GAIN_PARA_YZ 0x9E
#define AMI306_GAIN_PARA_YX 0x9F
#define AMI306_GAIN_PARA_ZY 0xA0
#define AMI306_GAIN_PARA_ZX 0xA1
/* offset at ZERO magnetic field */
#define AMI306_OFFZERO_X 0xF8
#define AMI306_OFFZERO_Y 0xFA
#define AMI306_OFFZERO_Z 0xFC
#define AK8974_INT_X_HIGH BIT(7) /* Axis over +threshold */
#define AK8974_INT_Y_HIGH BIT(6)
#define AK8974_INT_Z_HIGH BIT(5)
@ -158,6 +188,26 @@ struct ak8974 {
static const char ak8974_reg_avdd[] = "avdd";
static const char ak8974_reg_dvdd[] = "dvdd";
static int ak8974_get_u16_val(struct ak8974 *ak8974, u8 reg, u16 *val)
{
int ret;
__le16 bulk;
ret = regmap_bulk_read(ak8974->map, reg, &bulk, 2);
if (ret)
return ret;
*val = le16_to_cpu(bulk);
return 0;
}
static int ak8974_set_u16_val(struct ak8974 *ak8974, u8 reg, u16 val)
{
__le16 bulk = cpu_to_le16(val);
return regmap_bulk_write(ak8974->map, reg, &bulk, 2);
}
static int ak8974_set_power(struct ak8974 *ak8974, bool mode)
{
int ret;
@ -209,6 +259,12 @@ static int ak8974_configure(struct ak8974 *ak8974)
ret = regmap_write(ak8974->map, AK8974_CTRL3, 0);
if (ret)
return ret;
if (ak8974->variant == AK8974_WHOAMI_VALUE_AMI306) {
/* magic from datasheet: set high-speed measurement mode */
ret = ak8974_set_u16_val(ak8974, AMI306_CTRL4, 0xA07E);
if (ret)
return ret;
}
ret = regmap_write(ak8974->map, AK8974_INT_CTRL, AK8974_INT_CTRL_POL);
if (ret)
return ret;
@ -388,19 +444,6 @@ static int ak8974_selftest(struct ak8974 *ak8974)
return 0;
}
static int ak8974_get_u16_val(struct ak8974 *ak8974, u8 reg, u16 *val)
{
int ret;
__le16 bulk;
ret = regmap_bulk_read(ak8974->map, reg, &bulk, 2);
if (ret)
return ret;
*val = le16_to_cpu(bulk);
return 0;
}
static int ak8974_detect(struct ak8974 *ak8974)
{
unsigned int whoami;
@ -413,9 +456,13 @@ static int ak8974_detect(struct ak8974 *ak8974)
if (ret)
return ret;
name = "ami305";
switch (whoami) {
case AK8974_WHOAMI_VALUE_AMI306:
name = "ami306";
/* fall-through */
case AK8974_WHOAMI_VALUE_AMI305:
name = "ami305";
ret = regmap_read(ak8974->map, AMI305_VER, &fw);
if (ret)
return ret;
@ -602,9 +649,11 @@ static bool ak8974_writeable_reg(struct device *dev, unsigned int reg)
case AMI305_OFFSET_Y + 1:
case AMI305_OFFSET_Z:
case AMI305_OFFSET_Z + 1:
if (ak8974->variant == AK8974_WHOAMI_VALUE_AMI305)
return true;
return false;
return ak8974->variant == AK8974_WHOAMI_VALUE_AMI305 ||
ak8974->variant == AK8974_WHOAMI_VALUE_AMI306;
case AMI306_CTRL4:
case AMI306_CTRL4 + 1:
return ak8974->variant == AK8974_WHOAMI_VALUE_AMI306;
default:
return false;
}
@ -678,7 +727,7 @@ static int ak8974_probe(struct i2c_client *i2c,
ret = ak8974_detect(ak8974);
if (ret) {
dev_err(&i2c->dev, "neither AK8974 nor AMI305 found\n");
dev_err(&i2c->dev, "neither AK8974 nor AMI30x found\n");
goto power_off;
}
@ -827,6 +876,7 @@ static const struct dev_pm_ops ak8974_dev_pm_ops = {
static const struct i2c_device_id ak8974_id[] = {
{"ami305", 0 },
{"ami306", 0 },
{"ak8974", 0 },
{}
};
@ -850,7 +900,7 @@ static struct i2c_driver ak8974_driver = {
};
module_i2c_driver(ak8974_driver);
MODULE_DESCRIPTION("AK8974 and AMI305 3-axis magnetometer driver");
MODULE_DESCRIPTION("AK8974 and AMI30x 3-axis magnetometer driver");
MODULE_AUTHOR("Samu Onkalo");
MODULE_AUTHOR("Linus Walleij");
MODULE_LICENSE("GPL v2");