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path: root/drivers/iio/adc/sc27xx_adc.c
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Diffstat (limited to 'drivers/iio/adc/sc27xx_adc.c')
-rw-r--r--drivers/iio/adc/sc27xx_adc.c154
1 files changed, 116 insertions, 38 deletions
diff --git a/drivers/iio/adc/sc27xx_adc.c b/drivers/iio/adc/sc27xx_adc.c
index 2b60efea0c39..7940b23dcad9 100644
--- a/drivers/iio/adc/sc27xx_adc.c
+++ b/drivers/iio/adc/sc27xx_adc.c
@@ -5,10 +5,12 @@
#include <linux/iio/iio.h>
#include <linux/interrupt.h>
#include <linux/module.h>
+#include <linux/nvmem-consumer.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
+#include <linux/slab.h>
/* PMIC global registers definition */
#define SC27XX_MODULE_EN 0xc08
@@ -87,16 +89,73 @@ struct sc27xx_adc_linear_graph {
* should use the small-scale graph, and if more than 1.2v, we should use the
* big-scale graph.
*/
-static const struct sc27xx_adc_linear_graph big_scale_graph = {
+static struct sc27xx_adc_linear_graph big_scale_graph = {
4200, 3310,
3600, 2832,
};
-static const struct sc27xx_adc_linear_graph small_scale_graph = {
+static struct sc27xx_adc_linear_graph small_scale_graph = {
1000, 3413,
100, 341,
};
+static const struct sc27xx_adc_linear_graph big_scale_graph_calib = {
+ 4200, 856,
+ 3600, 733,
+};
+
+static const struct sc27xx_adc_linear_graph small_scale_graph_calib = {
+ 1000, 833,
+ 100, 80,
+};
+
+static int sc27xx_adc_get_calib_data(u32 calib_data, int calib_adc)
+{
+ return ((calib_data & 0xff) + calib_adc - 128) * 4;
+}
+
+static int sc27xx_adc_scale_calibration(struct sc27xx_adc_data *data,
+ bool big_scale)
+{
+ const struct sc27xx_adc_linear_graph *calib_graph;
+ struct sc27xx_adc_linear_graph *graph;
+ struct nvmem_cell *cell;
+ const char *cell_name;
+ u32 calib_data = 0;
+ void *buf;
+ size_t len;
+
+ if (big_scale) {
+ calib_graph = &big_scale_graph_calib;
+ graph = &big_scale_graph;
+ cell_name = "big_scale_calib";
+ } else {
+ calib_graph = &small_scale_graph_calib;
+ graph = &small_scale_graph;
+ cell_name = "small_scale_calib";
+ }
+
+ cell = nvmem_cell_get(data->dev, cell_name);
+ if (IS_ERR(cell))
+ return PTR_ERR(cell);
+
+ buf = nvmem_cell_read(cell, &len);
+ nvmem_cell_put(cell);
+
+ if (IS_ERR(buf))
+ return PTR_ERR(buf);
+
+ memcpy(&calib_data, buf, min(len, sizeof(u32)));
+
+ /* Only need to calibrate the adc values in the linear graph. */
+ graph->adc0 = sc27xx_adc_get_calib_data(calib_data, calib_graph->adc0);
+ graph->adc1 = sc27xx_adc_get_calib_data(calib_data >> 8,
+ calib_graph->adc1);
+
+ kfree(buf);
+ return 0;
+}
+
static int sc27xx_adc_get_ratio(int channel, int scale)
{
switch (channel) {
@@ -209,7 +268,7 @@ static void sc27xx_adc_volt_ratio(struct sc27xx_adc_data *data,
*div_denominator = ratio & SC27XX_RATIO_DENOMINATOR_MASK;
}
-static int sc27xx_adc_to_volt(const struct sc27xx_adc_linear_graph *graph,
+static int sc27xx_adc_to_volt(struct sc27xx_adc_linear_graph *graph,
int raw_adc)
{
int tmp;
@@ -273,6 +332,17 @@ static int sc27xx_adc_read_raw(struct iio_dev *indio_dev,
int ret, tmp;
switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ mutex_lock(&indio_dev->mlock);
+ ret = sc27xx_adc_read(data, chan->channel, scale, &tmp);
+ mutex_unlock(&indio_dev->mlock);
+
+ if (ret)
+ return ret;
+
+ *val = tmp;
+ return IIO_VAL_INT;
+
case IIO_CHAN_INFO_PROCESSED:
mutex_lock(&indio_dev->mlock);
ret = sc27xx_adc_read_processed(data, chan->channel, scale,
@@ -315,48 +385,47 @@ static const struct iio_info sc27xx_info = {
.write_raw = &sc27xx_adc_write_raw,
};
-#define SC27XX_ADC_CHANNEL(index) { \
+#define SC27XX_ADC_CHANNEL(index, mask) { \
.type = IIO_VOLTAGE, \
.channel = index, \
- .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) | \
- BIT(IIO_CHAN_INFO_SCALE), \
+ .info_mask_separate = mask | BIT(IIO_CHAN_INFO_SCALE), \
.datasheet_name = "CH##index", \
.indexed = 1, \
}
static const struct iio_chan_spec sc27xx_channels[] = {
- SC27XX_ADC_CHANNEL(0),
- SC27XX_ADC_CHANNEL(1),
- SC27XX_ADC_CHANNEL(2),
- SC27XX_ADC_CHANNEL(3),
- SC27XX_ADC_CHANNEL(4),
- SC27XX_ADC_CHANNEL(5),
- SC27XX_ADC_CHANNEL(6),
- SC27XX_ADC_CHANNEL(7),
- SC27XX_ADC_CHANNEL(8),
- SC27XX_ADC_CHANNEL(9),
- SC27XX_ADC_CHANNEL(10),
- SC27XX_ADC_CHANNEL(11),
- SC27XX_ADC_CHANNEL(12),
- SC27XX_ADC_CHANNEL(13),
- SC27XX_ADC_CHANNEL(14),
- SC27XX_ADC_CHANNEL(15),
- SC27XX_ADC_CHANNEL(16),
- SC27XX_ADC_CHANNEL(17),
- SC27XX_ADC_CHANNEL(18),
- SC27XX_ADC_CHANNEL(19),
- SC27XX_ADC_CHANNEL(20),
- SC27XX_ADC_CHANNEL(21),
- SC27XX_ADC_CHANNEL(22),
- SC27XX_ADC_CHANNEL(23),
- SC27XX_ADC_CHANNEL(24),
- SC27XX_ADC_CHANNEL(25),
- SC27XX_ADC_CHANNEL(26),
- SC27XX_ADC_CHANNEL(27),
- SC27XX_ADC_CHANNEL(28),
- SC27XX_ADC_CHANNEL(29),
- SC27XX_ADC_CHANNEL(30),
- SC27XX_ADC_CHANNEL(31),
+ SC27XX_ADC_CHANNEL(0, BIT(IIO_CHAN_INFO_PROCESSED)),
+ SC27XX_ADC_CHANNEL(1, BIT(IIO_CHAN_INFO_PROCESSED)),
+ SC27XX_ADC_CHANNEL(2, BIT(IIO_CHAN_INFO_PROCESSED)),
+ SC27XX_ADC_CHANNEL(3, BIT(IIO_CHAN_INFO_PROCESSED)),
+ SC27XX_ADC_CHANNEL(4, BIT(IIO_CHAN_INFO_PROCESSED)),
+ SC27XX_ADC_CHANNEL(5, BIT(IIO_CHAN_INFO_PROCESSED)),
+ SC27XX_ADC_CHANNEL(6, BIT(IIO_CHAN_INFO_PROCESSED)),
+ SC27XX_ADC_CHANNEL(7, BIT(IIO_CHAN_INFO_PROCESSED)),
+ SC27XX_ADC_CHANNEL(8, BIT(IIO_CHAN_INFO_PROCESSED)),
+ SC27XX_ADC_CHANNEL(9, BIT(IIO_CHAN_INFO_PROCESSED)),
+ SC27XX_ADC_CHANNEL(10, BIT(IIO_CHAN_INFO_PROCESSED)),
+ SC27XX_ADC_CHANNEL(11, BIT(IIO_CHAN_INFO_PROCESSED)),
+ SC27XX_ADC_CHANNEL(12, BIT(IIO_CHAN_INFO_PROCESSED)),
+ SC27XX_ADC_CHANNEL(13, BIT(IIO_CHAN_INFO_PROCESSED)),
+ SC27XX_ADC_CHANNEL(14, BIT(IIO_CHAN_INFO_PROCESSED)),
+ SC27XX_ADC_CHANNEL(15, BIT(IIO_CHAN_INFO_PROCESSED)),
+ SC27XX_ADC_CHANNEL(16, BIT(IIO_CHAN_INFO_PROCESSED)),
+ SC27XX_ADC_CHANNEL(17, BIT(IIO_CHAN_INFO_PROCESSED)),
+ SC27XX_ADC_CHANNEL(18, BIT(IIO_CHAN_INFO_PROCESSED)),
+ SC27XX_ADC_CHANNEL(19, BIT(IIO_CHAN_INFO_PROCESSED)),
+ SC27XX_ADC_CHANNEL(20, BIT(IIO_CHAN_INFO_RAW)),
+ SC27XX_ADC_CHANNEL(21, BIT(IIO_CHAN_INFO_PROCESSED)),
+ SC27XX_ADC_CHANNEL(22, BIT(IIO_CHAN_INFO_PROCESSED)),
+ SC27XX_ADC_CHANNEL(23, BIT(IIO_CHAN_INFO_PROCESSED)),
+ SC27XX_ADC_CHANNEL(24, BIT(IIO_CHAN_INFO_PROCESSED)),
+ SC27XX_ADC_CHANNEL(25, BIT(IIO_CHAN_INFO_PROCESSED)),
+ SC27XX_ADC_CHANNEL(26, BIT(IIO_CHAN_INFO_PROCESSED)),
+ SC27XX_ADC_CHANNEL(27, BIT(IIO_CHAN_INFO_PROCESSED)),
+ SC27XX_ADC_CHANNEL(28, BIT(IIO_CHAN_INFO_PROCESSED)),
+ SC27XX_ADC_CHANNEL(29, BIT(IIO_CHAN_INFO_PROCESSED)),
+ SC27XX_ADC_CHANNEL(30, BIT(IIO_CHAN_INFO_PROCESSED)),
+ SC27XX_ADC_CHANNEL(31, BIT(IIO_CHAN_INFO_PROCESSED)),
};
static int sc27xx_adc_enable(struct sc27xx_adc_data *data)
@@ -380,6 +449,15 @@ static int sc27xx_adc_enable(struct sc27xx_adc_data *data)
if (ret)
goto disable_clk;
+ /* ADC channel scales' calibration from nvmem device */
+ ret = sc27xx_adc_scale_calibration(data, true);
+ if (ret)
+ goto disable_clk;
+
+ ret = sc27xx_adc_scale_calibration(data, false);
+ if (ret)
+ goto disable_clk;
+
return 0;
disable_clk:
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.