diff options
Diffstat (limited to 'drivers/iio/adc/ina2xx-adc.c')
| -rw-r--r-- | drivers/iio/adc/ina2xx-adc.c | 111 |
1 files changed, 108 insertions, 3 deletions
diff --git a/drivers/iio/adc/ina2xx-adc.c b/drivers/iio/adc/ina2xx-adc.c index ada98ee4b80a..ddf878163bf9 100644 --- a/drivers/iio/adc/ina2xx-adc.c +++ b/drivers/iio/adc/ina2xx-adc.c @@ -48,8 +48,10 @@ #define INA2XX_MAX_REGISTERS 8 /* settings - depend on use case */ -#define INA219_CONFIG_DEFAULT 0x399F /* PGA=8 */ +#define INA219_CONFIG_DEFAULT 0x399F /* PGA=1/8, BRNG=32V */ #define INA219_DEFAULT_IT 532 +#define INA219_DEFAULT_BRNG 1 /* 32V */ +#define INA219_DEFAULT_PGA 125 /* 1000/8 */ #define INA226_CONFIG_DEFAULT 0x4327 #define INA226_DEFAULT_AVG 4 #define INA226_DEFAULT_IT 1110 @@ -62,6 +64,14 @@ */ #define INA2XX_MODE_MASK GENMASK(3, 0) +/* Gain for VShunt: 1/8 (default), 1/4, 1/2, 1 */ +#define INA219_PGA_MASK GENMASK(12, 11) +#define INA219_SHIFT_PGA(val) ((val) << 11) + +/* VBus range: 32V (default), 16V */ +#define INA219_BRNG_MASK BIT(13) +#define INA219_SHIFT_BRNG(val) ((val) << 13) + /* Averaging for VBus/VShunt/Power */ #define INA226_AVG_MASK GENMASK(11, 9) #define INA226_SHIFT_AVG(val) ((val) << 9) @@ -131,6 +141,8 @@ struct ina2xx_chip_info { int avg; int int_time_vbus; /* Bus voltage integration time uS */ int int_time_vshunt; /* Shunt voltage integration time uS */ + int range_vbus; /* Bus voltage maximum in V */ + int pga_gain_vshunt; /* Shunt voltage PGA gain */ bool allow_async_readout; }; @@ -226,6 +238,18 @@ static int ina2xx_read_raw(struct iio_dev *indio_dev, *val = 1; return IIO_VAL_INT; } + + case IIO_CHAN_INFO_HARDWAREGAIN: + switch (chan->address) { + case INA2XX_SHUNT_VOLTAGE: + *val = chip->pga_gain_vshunt; + *val2 = 1000; + return IIO_VAL_FRACTIONAL; + + case INA2XX_BUS_VOLTAGE: + *val = chip->range_vbus == 32 ? 1 : 2; + return IIO_VAL_INT; + } } return -EINVAL; @@ -360,6 +384,74 @@ static int ina219_set_int_time_vshunt(struct ina2xx_chip_info *chip, return 0; } +static const int ina219_vbus_range_tab[] = { 1, 2 }; +static int ina219_set_vbus_range_denom(struct ina2xx_chip_info *chip, + unsigned int range, + unsigned int *config) +{ + if (range == 1) + chip->range_vbus = 32; + else if (range == 2) + chip->range_vbus = 16; + else + return -EINVAL; + + *config &= ~INA219_BRNG_MASK; + *config |= INA219_SHIFT_BRNG(range == 1 ? 1 : 0) & INA219_BRNG_MASK; + + return 0; +} + +static const int ina219_vshunt_gain_tab[] = { 125, 250, 500, 1000 }; +static const int ina219_vshunt_gain_frac[] = { + 125, 1000, 250, 1000, 500, 1000, 1000, 1000 }; + +static int ina219_set_vshunt_pga_gain(struct ina2xx_chip_info *chip, + unsigned int gain, + unsigned int *config) +{ + int bits; + + if (gain < 125 || gain > 1000) + return -EINVAL; + + bits = find_closest(gain, ina219_vshunt_gain_tab, + ARRAY_SIZE(ina219_vshunt_gain_tab)); + + chip->pga_gain_vshunt = ina219_vshunt_gain_tab[bits]; + bits = 3 - bits; + + *config &= ~INA219_PGA_MASK; + *config |= INA219_SHIFT_PGA(bits) & INA219_PGA_MASK; + + return 0; +} + +static int ina2xx_read_avail(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + const int **vals, int *type, int *length, + long mask) +{ + switch (mask) { + case IIO_CHAN_INFO_HARDWAREGAIN: + switch (chan->address) { + case INA2XX_SHUNT_VOLTAGE: + *type = IIO_VAL_FRACTIONAL; + *length = sizeof(ina219_vshunt_gain_frac) / sizeof(int); + *vals = ina219_vshunt_gain_frac; + return IIO_AVAIL_LIST; + + case INA2XX_BUS_VOLTAGE: + *type = IIO_VAL_INT; + *length = sizeof(ina219_vbus_range_tab) / sizeof(int); + *vals = ina219_vbus_range_tab; + return IIO_AVAIL_LIST; + } + } + + return -EINVAL; +} + static int ina2xx_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int val, int val2, long mask) @@ -402,6 +494,14 @@ static int ina2xx_write_raw(struct iio_dev *indio_dev, } break; + case IIO_CHAN_INFO_HARDWAREGAIN: + if (chan->address == INA2XX_SHUNT_VOLTAGE) + ret = ina219_set_vshunt_pga_gain(chip, val * 1000 + + val2 / 1000, &tmp); + else + ret = ina219_set_vbus_range_denom(chip, val, &tmp); + break; + default: ret = -EINVAL; } @@ -546,7 +646,10 @@ static ssize_t ina2xx_shunt_resistor_store(struct device *dev, .channel = (_index), \ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \ BIT(IIO_CHAN_INFO_SCALE) | \ - BIT(IIO_CHAN_INFO_INT_TIME), \ + BIT(IIO_CHAN_INFO_INT_TIME) | \ + BIT(IIO_CHAN_INFO_HARDWAREGAIN), \ + .info_mask_separate_available = \ + BIT(IIO_CHAN_INFO_HARDWAREGAIN), \ .info_mask_shared_by_dir = BIT(IIO_CHAN_INFO_SAMP_FREQ), \ .scan_index = (_index), \ .scan_type = { \ @@ -754,7 +857,6 @@ static IIO_CONST_ATTR_NAMED(ina226_integration_time_available, integration_time_available, "0.000140 0.000204 0.000332 0.000588 0.001100 0.002116 0.004156 0.008244"); - static IIO_DEVICE_ATTR(in_allow_async_readout, S_IRUGO | S_IWUSR, ina2xx_allow_async_readout_show, ina2xx_allow_async_readout_store, 0); @@ -788,6 +890,7 @@ static const struct attribute_group ina226_attribute_group = { static const struct iio_info ina219_info = { .attrs = &ina219_attribute_group, .read_raw = ina2xx_read_raw, + .read_avail = ina2xx_read_avail, .write_raw = ina2xx_write_raw, .debugfs_reg_access = ina2xx_debug_reg, }; @@ -868,6 +971,8 @@ static int ina2xx_probe(struct i2c_client *client, chip->avg = 1; ina219_set_int_time_vbus(chip, INA219_DEFAULT_IT, &val); ina219_set_int_time_vshunt(chip, INA219_DEFAULT_IT, &val); + ina219_set_vbus_range_denom(chip, INA219_DEFAULT_BRNG, &val); + ina219_set_vshunt_pga_gain(chip, INA219_DEFAULT_PGA, &val); } ret = ina2xx_init(chip, val); |