};
struct sun4i_gpadc_iio {
@@ -148,6 +154,8 @@ struct sun4i_gpadc_iio {
struct clk *mod_clk;
struct reset_control *reset;
int sensor_id;
+ u32 calibration_data[2];
+ bool has_calibration_data[2];
/* prevents concurrent reads of temperature and ADC */
struct mutex mutex;
struct thermal_zone_device *tzd;
@@ -459,6 +467,17 @@ static int sun4i_gpadc_runtime_suspend(struct
device *dev)
return info->data->sample_end(info);
}
+static void sunxi_calibrate(struct sun4i_gpadc_iio *info)
+{
+ if (info->has_calibration_data[0])
+ regmap_write(info->regmap, SUNXI_THS_CDATA_0_1,
+ info->calibration_data[0]);
+
+ if (info->has_calibration_data[1])
+ regmap_write(info->regmap, SUNXI_THS_CDATA_2_3,
+ info->calibration_data[1]);
+}
+
static int sun4i_gpadc_sample_start(struct sun4i_gpadc_iio *info)
{
/* clkin = 6MHz */
@@ -481,6 +500,7 @@ static int sun4i_gpadc_sample_start(struct
sun4i_gpadc_iio *info)
static int sunxi_ths_sample_start(struct sun4i_gpadc_iio *info)
{
u32 value;
+ sunxi_calibrate(info);
if (info->data->ctrl0_map)
regmap_write(info->regmap, SUNXI_THS_CTRL0,
@@ -602,6 +622,9 @@ static int sun4i_gpadc_probe_dt(struct
platform_device *pdev,
struct resource *mem;
void __iomem *base;
int ret;
+ struct nvmem_cell *cell;
+ ssize_t cell_size;
+ u64 *cell_data;
info->data = of_device_get_match_data(&pdev->dev);
if (!info->data)
@@ -616,6 +639,35 @@ static int sun4i_gpadc_probe_dt(struct
platform_device *pdev,
if (IS_ERR(base))
return PTR_ERR(base);
+ info->has_calibration_data[0] = false;
+ info->has_calibration_data[1] = false;
+
+ if (!info->data->supports_nvmem)
+ goto no_nvmem;
+
+ cell = devm_nvmem_cell_get(&pdev->dev, "calibration");
+ if (IS_ERR(cell)) {
+ if (PTR_ERR(cell) == -EPROBE_DEFER)
+ return PTR_ERR(cell);
Use a goto here to no_nvmem.
Then you can drop the below else to make things more readable.
+ } else {
+ cell_data = (u64 *)nvmem_cell_read(cell, &cell_size);
+ devm_nvmem_cell_put(&pdev->dev, cell);
I'm really not keen on use of devm for things we are intending
to drop almost immediately. Just use the non managed versions
and clean up properly in the error paths (if there are any
where it is needed - which there aren't that I can see)
^^ Ok, I will rework that.
+ if (cell_size <= 4) {
Is it valid if it is anything other than 4?
For sensors with only one sensor would be also a 2 valid, for those
with
2 sensors ==> 4, with 3 sensors ==> 6 and with and with 4 sensors ==>
8.
In hardware we have in total to 32bit registers for calibration, thus I
thought it would be a good idea to use always four bytes per register.
If two bytes are used, they should be the default value.
But I agree, this needs a rework.
+ info->has_calibration_data[0] = true;
+ info->calibration_data[0] = be32_to_cpu(cell_data[0] &
+ GENMASK(31, 0));
Masking isn't needed, If you want to be paranoid there is the
lower_32_bits
function..
^^ Ok, I will rework that.
+ } else if (cell_size <= 8) {
+ info->has_calibration_data[0] = true;
+ info->calibration_data[0] = be32_to_cpu(cell_data[0] &
+ GENMASK(31, 0));
This first block is repeated. Easy enough to avoid I think...
^^ Ok, I will rework that.
+ info->has_calibration_data[1] = true;
+ info->calibration_data[1] = be32_to_cpu(
+ (cell_data[0] >> 32) & GENMASK(31, 0));
+ }
+ }
+
+no_nvmem:
+
info->regmap = devm_regmap_init_mmio(&pdev->dev, base,
&sun4i_gpadc_regmap_config);
if (IS_ERR(info->regmap)) {
diff --git a/include/linux/mfd/sun4i-gpadc.h
b/include/linux/mfd/sun4i-gpadc.h
index 40b4dd9d2405..c251002431bd 100644
--- a/include/linux/mfd/sun4i-gpadc.h
+++ b/include/linux/mfd/sun4i-gpadc.h
@@ -90,6 +90,8 @@
#define SUNXI_THS_CTRL0 0x00
#define SUNXI_THS_CTRL2 0x40
#define SUNXI_THS_FILTER 0x70
+#define SUNXI_THS_CDATA_0_1 0x74
+#define SUNXI_THS_CDATA_2_3 0x78
#define SUNXI_THS_TDATA0 0x80
#define SUNXI_THS_TDATA1 0x84
#define SUNXI_THS_TDATA2 0x88
Thanks,
Philipp
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