diff options
Diffstat (limited to 'drivers/iio/adc/ad7606_spi.c')
| -rw-r--r-- | drivers/iio/adc/ad7606_spi.c | 109 |
1 files changed, 108 insertions, 1 deletions
diff --git a/drivers/iio/adc/ad7606_spi.c b/drivers/iio/adc/ad7606_spi.c index 98ed52b74507..29945ad07dca 100644 --- a/drivers/iio/adc/ad7606_spi.c +++ b/drivers/iio/adc/ad7606_spi.c @@ -28,9 +28,23 @@ * an offset of 2 for register address. */ #define AD7616_RANGE_CH_ADDR(ch) ((ch) >> 2) -/* The range of the channel is stored on 2 bits*/ +/* The range of the channel is stored in 2 bits */ #define AD7616_RANGE_CH_MSK(ch) (0b11 << (((ch) & 0b11) * 2)) #define AD7616_RANGE_CH_MODE(ch, mode) ((mode) << ((((ch) & 0b11)) * 2)) + +#define AD7606_CONFIGURATION_REGISTER 0x02 +#define AD7606_SINGLE_DOUT 0x00 + +/* + * Range for AD7606B channels are stored in registers starting with address 0x3. + * Each register stores range for 2 channels(4 bits per channel). + */ +#define AD7606_RANGE_CH_MSK(ch) (GENMASK(3, 0) << (4 * ((ch) & 0x1))) +#define AD7606_RANGE_CH_MODE(ch, mode) \ + ((GENMASK(3, 0) & mode) << (4 * ((ch) & 0x1))) +#define AD7606_RANGE_CH_ADDR(ch) (0x03 + ((ch) >> 1)) +#define AD7606_OS_MODE 0x08 + static const struct iio_chan_spec ad7616_sw_channels[] = { IIO_CHAN_SOFT_TIMESTAMP(16), AD7616_CHANNEL(0), @@ -51,6 +65,22 @@ static const struct iio_chan_spec ad7616_sw_channels[] = { AD7616_CHANNEL(15), }; +static const struct iio_chan_spec ad7606b_sw_channels[] = { + IIO_CHAN_SOFT_TIMESTAMP(8), + AD7616_CHANNEL(0), + AD7616_CHANNEL(1), + AD7616_CHANNEL(2), + AD7616_CHANNEL(3), + AD7616_CHANNEL(4), + AD7616_CHANNEL(5), + AD7616_CHANNEL(6), + AD7616_CHANNEL(7), +}; + +static const unsigned int ad7606B_oversampling_avail[9] = { + 1, 2, 4, 8, 16, 32, 64, 128, 256 +}; + static u16 ad7616_spi_rd_wr_cmd(int addr, char isWriteOp) { /* @@ -60,6 +90,16 @@ static u16 ad7616_spi_rd_wr_cmd(int addr, char isWriteOp) return ((addr & 0x7F) << 1) | ((isWriteOp & 0x1) << 7); } +static u16 ad7606B_spi_rd_wr_cmd(int addr, char is_write_op) +{ + /* + * The address of register consists of one bit which + * specifies a read command placed in bit 6, followed by + * 6 bits of address. + */ + return (addr & 0x3F) | (((~is_write_op) & 0x1) << 6); +} + static int ad7606_spi_read_block(struct device *dev, int count, void *buf) { @@ -169,6 +209,23 @@ static int ad7616_write_os_sw(struct iio_dev *indio_dev, int val) AD7616_OS_MASK, val << 2); } +static int ad7606_write_scale_sw(struct iio_dev *indio_dev, int ch, int val) +{ + struct ad7606_state *st = iio_priv(indio_dev); + + return ad7606_spi_write_mask(st, + AD7606_RANGE_CH_ADDR(ch), + AD7606_RANGE_CH_MSK(ch), + AD7606_RANGE_CH_MODE(ch, val)); +} + +static int ad7606_write_os_sw(struct iio_dev *indio_dev, int val) +{ + struct ad7606_state *st = iio_priv(indio_dev); + + return ad7606_spi_reg_write(st, AD7606_OS_MODE, val); +} + static int ad7616_sw_mode_config(struct iio_dev *indio_dev) { struct ad7606_state *st = iio_priv(indio_dev); @@ -189,6 +246,42 @@ static int ad7616_sw_mode_config(struct iio_dev *indio_dev) AD7616_BURST_MODE | AD7616_SEQEN_MODE); } +static int ad7606B_sw_mode_config(struct iio_dev *indio_dev) +{ + struct ad7606_state *st = iio_priv(indio_dev); + unsigned long os[3] = {1}; + + /* + * Software mode is enabled when all three oversampling + * pins are set to high. If oversampling gpios are defined + * in the device tree, then they need to be set to high, + * otherwise, they must be hardwired to VDD + */ + if (st->gpio_os) { + gpiod_set_array_value(ARRAY_SIZE(os), + st->gpio_os->desc, st->gpio_os->info, os); + } + /* OS of 128 and 256 are available only in software mode */ + st->oversampling_avail = ad7606B_oversampling_avail; + st->num_os_ratios = ARRAY_SIZE(ad7606B_oversampling_avail); + + st->write_scale = ad7606_write_scale_sw; + st->write_os = &ad7606_write_os_sw; + + /* Configure device spi to output on a single channel */ + st->bops->reg_write(st, + AD7606_CONFIGURATION_REGISTER, + AD7606_SINGLE_DOUT); + + /* + * Scale can be configured individually for each channel + * in software mode. + */ + indio_dev->channels = ad7606b_sw_channels; + + return 0; +} + static const struct ad7606_bus_ops ad7606_spi_bops = { .read_block = ad7606_spi_read_block, }; @@ -202,6 +295,15 @@ static const struct ad7606_bus_ops ad7616_spi_bops = { .sw_mode_config = ad7616_sw_mode_config, }; +static const struct ad7606_bus_ops ad7606B_spi_bops = { + .read_block = ad7606_spi_read_block, + .reg_read = ad7606_spi_reg_read, + .reg_write = ad7606_spi_reg_write, + .write_mask = ad7606_spi_write_mask, + .rd_wr_cmd = ad7606B_spi_rd_wr_cmd, + .sw_mode_config = ad7606B_sw_mode_config, +}; + static int ad7606_spi_probe(struct spi_device *spi) { const struct spi_device_id *id = spi_get_device_id(spi); @@ -211,6 +313,9 @@ static int ad7606_spi_probe(struct spi_device *spi) case ID_AD7616: bops = &ad7616_spi_bops; break; + case ID_AD7606B: + bops = &ad7606B_spi_bops; + break; default: bops = &ad7606_spi_bops; break; @@ -226,6 +331,7 @@ static const struct spi_device_id ad7606_id_table[] = { { "ad7606-4", ID_AD7606_4 }, { "ad7606-6", ID_AD7606_6 }, { "ad7606-8", ID_AD7606_8 }, + { "ad7606b", ID_AD7606B }, { "ad7616", ID_AD7616 }, {} }; @@ -236,6 +342,7 @@ static const struct of_device_id ad7606_of_match[] = { { .compatible = "adi,ad7606-4" }, { .compatible = "adi,ad7606-6" }, { .compatible = "adi,ad7606-8" }, + { .compatible = "adi,ad7606b" }, { .compatible = "adi,ad7616" }, { }, }; |