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iio: dac: ad5758: Modifications for new revision

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This patch will ensure compatibility with the new revision of the AD5758
dac converter. The modifications consist of removing the fault_prot_switch
function since this option is no longer available, and enabling the
ENABLE_PPC_BUFFERS bit in ADC_CONFIG register before setting the PPC
current mode.

The previous version of the chip was never released to customers
so there is no need to support it going forwards.

Signed-off-by: Mircea Caprioru <mircea.caprioru@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Mircea Caprioru 2019-04-09 16:35:21 +03:00 committed by Jonathan Cameron
parent b9fedb0a17
commit edde945257
1 changed files with 18 additions and 37 deletions
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55
drivers/iio/dac/ad5758.c
View File

@ -72,8 +72,6 @@
#define AD5758_DCDC_CONFIG1_DCDC_VPROG_MODE(x) (((x) & 0x1F) << 0)
#define AD5758_DCDC_CONFIG1_DCDC_MODE_MSK GENMASK(6, 5)
#define AD5758_DCDC_CONFIG1_DCDC_MODE_MODE(x) (((x) & 0x3) << 5)
#define AD5758_DCDC_CONFIG1_PROT_SW_EN_MSK BIT(7)
#define AD5758_DCDC_CONFIG1_PROT_SW_EN_MODE(x) (((x) & 0x1) << 7)
/* AD5758_DCDC_CONFIG2 */
#define AD5758_DCDC_CONFIG2_ILIMIT_MSK GENMASK(3, 1)
@ -84,6 +82,10 @@
/* AD5758_DIGITAL_DIAG_RESULTS */
#define AD5758_CAL_MEM_UNREFRESHED_MSK BIT(15)
/* AD5758_ADC_CONFIG */
#define AD5758_ADC_CONFIG_PPC_BUF_EN(x) (((x) & 0x1) << 11)
#define AD5758_ADC_CONFIG_PPC_BUF_MSK BIT(11)
#define AD5758_WR_FLAG_MSK(x) (0x80 | ((x) & 0x1F))
#define AD5758_FULL_SCALE_MICRO 65535000000ULL
@ -315,6 +317,18 @@ static int ad5758_set_dc_dc_conv_mode(struct ad5758_state *st,
{
int ret;
/*
* The ENABLE_PPC_BUFFERS bit must be set prior to enabling PPC current
* mode.
*/
if (mode == AD5758_DCDC_MODE_PPC_CURRENT) {
ret = ad5758_spi_write_mask(st, AD5758_ADC_CONFIG,
AD5758_ADC_CONFIG_PPC_BUF_MSK,
AD5758_ADC_CONFIG_PPC_BUF_EN(1));
if (ret < 0)
return ret;
}
ret = ad5758_spi_write_mask(st, AD5758_DCDC_CONFIG1,
AD5758_DCDC_CONFIG1_DCDC_MODE_MSK,
AD5758_DCDC_CONFIG1_DCDC_MODE_MODE(mode));
@ -444,23 +458,6 @@ static int ad5758_set_out_range(struct ad5758_state *st, int range)
AD5758_CAL_MEM_UNREFRESHED_MSK);
}
static int ad5758_fault_prot_switch_en(struct ad5758_state *st, bool enable)
{
int ret;
ret = ad5758_spi_write_mask(st, AD5758_DCDC_CONFIG1,
AD5758_DCDC_CONFIG1_PROT_SW_EN_MSK,
AD5758_DCDC_CONFIG1_PROT_SW_EN_MODE(enable));
if (ret < 0)
return ret;
/*
* Poll the BUSY_3WI bit in the DCDC_CONFIG2 register until it is 0.
* This allows the 3-wire interface communication to complete.
*/
return ad5758_wait_for_task_complete(st, AD5758_DCDC_CONFIG2,
AD5758_DCDC_CONFIG2_BUSY_3WI_MSK);
}
static int ad5758_internal_buffers_en(struct ad5758_state *st, bool enable)
{
int ret;
@ -585,8 +582,8 @@ static ssize_t ad5758_write_powerdown(struct iio_dev *indio_dev,
{
struct ad5758_state *st = iio_priv(indio_dev);
bool pwr_down;
unsigned int dcdc_config1_mode, dc_dc_mode, dac_config_mode, val;
unsigned long int dcdc_config1_msk, dac_config_msk;
unsigned int dc_dc_mode, dac_config_mode, val;
unsigned long int dac_config_msk;
int ret;
ret = kstrtobool(buf, &pwr_down);
@ -602,17 +599,6 @@ static ssize_t ad5758_write_powerdown(struct iio_dev *indio_dev,
val = 1;
}
dcdc_config1_mode = AD5758_DCDC_CONFIG1_DCDC_MODE_MODE(dc_dc_mode) |
AD5758_DCDC_CONFIG1_PROT_SW_EN_MODE(val);
dcdc_config1_msk = AD5758_DCDC_CONFIG1_DCDC_MODE_MSK |
AD5758_DCDC_CONFIG1_PROT_SW_EN_MSK;
ret = ad5758_spi_write_mask(st, AD5758_DCDC_CONFIG1,
dcdc_config1_msk,
dcdc_config1_mode);
if (ret < 0)
goto err_unlock;
dac_config_mode = AD5758_DAC_CONFIG_OUT_EN_MODE(val) |
AD5758_DAC_CONFIG_INT_EN_MODE(val);
dac_config_msk = AD5758_DAC_CONFIG_OUT_EN_MSK |
@ -841,11 +827,6 @@ static int ad5758_init(struct ad5758_state *st)
return ret;
}
/* Enable the VIOUT fault protection switch (FPS is closed) */
ret = ad5758_fault_prot_switch_en(st, 1);
if (ret < 0)
return ret;
/* Power up the DAC and internal (INT) amplifiers */
ret = ad5758_internal_buffers_en(st, 1);
if (ret < 0)