diff options
Diffstat (limited to 'drivers/iio/magnetometer')
| -rw-r--r-- | drivers/iio/magnetometer/Kconfig | 4 | ||||
| -rw-r--r-- | drivers/iio/magnetometer/ak8974.c | 90 |
2 files changed, 72 insertions, 22 deletions
diff --git a/drivers/iio/magnetometer/Kconfig b/drivers/iio/magnetometer/Kconfig index 421ad90a5fbe..ed9d776d01af 100644 --- a/drivers/iio/magnetometer/Kconfig +++ b/drivers/iio/magnetometer/Kconfig @@ -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. diff --git a/drivers/iio/magnetometer/ak8974.c b/drivers/iio/magnetometer/ak8974.c index e13370dc9b1c..76091da20a0c 100644 --- a/drivers/iio/magnetometer/ak8974.c +++ b/drivers/iio/magnetometer/ak8974.c @@ -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"); |