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iio: adc: adi-axi-adc: implement backend debugfs interface

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Implement debugfs options to read/write registers and print the channel
status into a buffer (so we may know better the cause for errors) .

Signed-off-by: Nuno Sa <nuno.sa@analog.com>
Link: https://patch.msgid.link/20240802-dev-iio-backend-add-debugfs-v2-6-4cb62852f0d0@analog.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Nuno Sa 2024-08-02 16:27:04 +02:00 committed by Jonathan Cameron
parent 232cca61cf
commit c031fee042
1 changed files with 41 additions and 0 deletions
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41
drivers/iio/adc/adi-axi-adc.c
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@ -61,6 +61,10 @@
#define ADI_AXI_ADC_REG_CHAN_STATUS(c) (0x0404 + (c) * 0x40)
#define ADI_AXI_ADC_CHAN_STAT_PN_MASK GENMASK(2, 1)
/* out of sync */
#define ADI_AXI_ADC_CHAN_STAT_PN_OOS BIT(1)
/* spurious out of sync */
#define ADI_AXI_ADC_CHAN_STAT_PN_ERR BIT(2)
#define ADI_AXI_ADC_REG_CHAN_CTRL_3(c) (0x0418 + (c) * 0x40)
#define ADI_AXI_ADC_CHAN_PN_SEL_MASK GENMASK(19, 16)
@ -246,6 +250,30 @@ static int axi_adc_chan_status(struct iio_backend *back, unsigned int chan,
return 0;
}
static int axi_adc_debugfs_print_chan_status(struct iio_backend *back,
unsigned int chan, char *buf,
size_t len)
{
struct adi_axi_adc_state *st = iio_backend_get_priv(back);
u32 val;
int ret;
ret = axi_adc_read_chan_status(st, chan, &val);
if (ret)
return ret;
/*
* PN_ERR is cleared in case out of sync is set. Hence, no point in
* checking both bits.
*/
if (val & ADI_AXI_ADC_CHAN_STAT_PN_OOS)
return scnprintf(buf, len, "CH%u: Out of Sync.\n", chan);
if (val & ADI_AXI_ADC_CHAN_STAT_PN_ERR)
return scnprintf(buf, len, "CH%u: Spurious Out of Sync.\n", chan);
return scnprintf(buf, len, "CH%u: OK.\n", chan);
}
static int axi_adc_chan_enable(struct iio_backend *back, unsigned int chan)
{
struct adi_axi_adc_state *st = iio_backend_get_priv(back);
@ -280,6 +308,17 @@ static void axi_adc_free_buffer(struct iio_backend *back,
iio_dmaengine_buffer_free(buffer);
}
static int axi_adc_reg_access(struct iio_backend *back, unsigned int reg,
unsigned int writeval, unsigned int *readval)
{
struct adi_axi_adc_state *st = iio_backend_get_priv(back);
if (readval)
return regmap_read(st->regmap, reg, readval);
return regmap_write(st->regmap, reg, writeval);
}
static const struct regmap_config axi_adc_regmap_config = {
.val_bits = 32,
.reg_bits = 32,
@ -298,6 +337,8 @@ static const struct iio_backend_ops adi_axi_adc_ops = {
.iodelay_set = axi_adc_iodelays_set,
.test_pattern_set = axi_adc_test_pattern_set,
.chan_status = axi_adc_chan_status,
.debugfs_reg_access = iio_backend_debugfs_ptr(axi_adc_reg_access),
.debugfs_print_chan_status = iio_backend_debugfs_ptr(axi_adc_debugfs_print_chan_status),
};
static const struct iio_backend_info adi_axi_adc_generic = {