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Subject[PATCH V2 3/7] iio: adc: sc27xx: structure adjuststment and optimization
Date
From: Cixi Geng <cixi.geng1@unisoc.com>

Introduce one variant device data structure to be compatible
with SC2731 PMIC since it has different scale and ratio calculation
and so on.

Signed-off-by: Yuming Zhu <yuming.zhu1@unisoc.com>
Signed-off-by: Cixi Geng <cixi.geng1@unisoc.com>
---
drivers/iio/adc/sc27xx_adc.c | 95 ++++++++++++++++++++++++++++++------
1 file changed, 80 insertions(+), 15 deletions(-)

diff --git a/drivers/iio/adc/sc27xx_adc.c b/drivers/iio/adc/sc27xx_adc.c
index aee076c8e2b1..68629fbcfec5 100644
--- a/drivers/iio/adc/sc27xx_adc.c
+++ b/drivers/iio/adc/sc27xx_adc.c
@@ -12,9 +12,9 @@
#include <linux/slab.h>

/* PMIC global registers definition */
-#define SC27XX_MODULE_EN 0xc08
+#define SC2731_MODULE_EN 0xc08
#define SC27XX_MODULE_ADC_EN BIT(5)
-#define SC27XX_ARM_CLK_EN 0xc10
+#define SC2731_ARM_CLK_EN 0xc10
#define SC27XX_CLK_ADC_EN BIT(5)
#define SC27XX_CLK_ADC_CLK_EN BIT(6)

@@ -78,6 +78,23 @@ struct sc27xx_adc_data {
int channel_scale[SC27XX_ADC_CHANNEL_MAX];
u32 base;
int irq;
+ const struct sc27xx_adc_variant_data *var_data;
+};
+
+/*
+ * Since different PMICs of SC27xx series can have different
+ * address and ratio, we should save ratio config and base
+ * in the device data structure.
+ */
+struct sc27xx_adc_variant_data {
+ u32 module_en;
+ u32 clk_en;
+ u32 scale_shift;
+ u32 scale_mask;
+ const struct sc27xx_adc_linear_graph *bscale_cal;
+ const struct sc27xx_adc_linear_graph *sscale_cal;
+ void (*init_scale)(struct sc27xx_adc_data *data);
+ int (*get_ratio)(int channel, int scale);
};

struct sc27xx_adc_linear_graph {
@@ -103,6 +120,17 @@ static struct sc27xx_adc_linear_graph small_scale_graph = {
100, 341,
};

+/* Add these for sc2731 pmic, and the [big|small]_scale_graph_calib for common's */
+static const struct sc27xx_adc_linear_graph sc2731_big_scale_graph_calib = {
+ 4200, 850,
+ 3600, 728,
+};
+
+static const struct sc27xx_adc_linear_graph sc2731_small_scale_graph_calib = {
+ 1000, 838,
+ 100, 84,
+};
+
static const struct sc27xx_adc_linear_graph big_scale_graph_calib = {
4200, 856,
3600, 733,
@@ -130,11 +158,11 @@ static int sc27xx_adc_scale_calibration(struct sc27xx_adc_data *data,
size_t len;

if (big_scale) {
- calib_graph = &big_scale_graph_calib;
+ calib_graph = data->var_data->bscale_cal;
graph = &big_scale_graph;
cell_name = "big_scale_calib";
} else {
- calib_graph = &small_scale_graph_calib;
+ calib_graph = data->var_data->sscale_cal;
graph = &small_scale_graph;
cell_name = "small_scale_calib";
}
@@ -160,7 +188,7 @@ static int sc27xx_adc_scale_calibration(struct sc27xx_adc_data *data,
return 0;
}

-static int sc27xx_adc_get_ratio(int channel, int scale)
+static int sc2731_adc_get_ratio(int channel, int scale)
{
switch (channel) {
case 1:
@@ -185,6 +213,21 @@ static int sc27xx_adc_get_ratio(int channel, int scale)
return SC27XX_VOLT_RATIO(1, 1);
}

+/*
+ * According to the datasheet set specific value on some channel.
+ */
+static void sc2731_adc_scale_init(struct sc27xx_adc_data *data)
+{
+ int i;
+
+ for (i = 0; i < SC27XX_ADC_CHANNEL_MAX; i++) {
+ if (i == 5)
+ data->channel_scale[i] = 1;
+ else
+ data->channel_scale[i] = 0;
+ }
+}
+
static int sc27xx_adc_read(struct sc27xx_adc_data *data, int channel,
int scale, int *val)
{
@@ -208,10 +251,11 @@ static int sc27xx_adc_read(struct sc27xx_adc_data *data, int channel,
goto disable_adc;

/* Configure the channel id and scale */
- tmp = (scale << SC27XX_ADC_SCALE_SHIFT) & SC27XX_ADC_SCALE_MASK;
+ tmp = (scale << data->var_data->scale_shift) & data->var_data->scale_mask;
tmp |= channel & SC27XX_ADC_CHN_ID_MASK;
ret = regmap_update_bits(data->regmap, data->base + SC27XX_ADC_CH_CFG,
- SC27XX_ADC_CHN_ID_MASK | SC27XX_ADC_SCALE_MASK,
+ SC27XX_ADC_CHN_ID_MASK |
+ data->var_data->scale_mask,
tmp);
if (ret)
goto disable_adc;
@@ -262,8 +306,9 @@ static void sc27xx_adc_volt_ratio(struct sc27xx_adc_data *data,
int channel, int scale,
u32 *div_numerator, u32 *div_denominator)
{
- u32 ratio = sc27xx_adc_get_ratio(channel, scale);
+ u32 ratio;

+ ratio = data->var_data->get_ratio(channel, scale);
*div_numerator = ratio >> SC27XX_RATIO_NUMERATOR_OFFSET;
*div_denominator = ratio & SC27XX_RATIO_DENOMINATOR_MASK;
}
@@ -432,13 +477,13 @@ static int sc27xx_adc_enable(struct sc27xx_adc_data *data)
{
int ret;

- ret = regmap_update_bits(data->regmap, SC27XX_MODULE_EN,
+ ret = regmap_update_bits(data->regmap, data->var_data->module_en,
SC27XX_MODULE_ADC_EN, SC27XX_MODULE_ADC_EN);
if (ret)
return ret;

/* Enable ADC work clock and controller clock */
- ret = regmap_update_bits(data->regmap, SC27XX_ARM_CLK_EN,
+ ret = regmap_update_bits(data->regmap, data->var_data->clk_en,
SC27XX_CLK_ADC_EN | SC27XX_CLK_ADC_CLK_EN,
SC27XX_CLK_ADC_EN | SC27XX_CLK_ADC_CLK_EN);
if (ret)
@@ -456,10 +501,10 @@ static int sc27xx_adc_enable(struct sc27xx_adc_data *data)
return 0;

disable_clk:
- regmap_update_bits(data->regmap, SC27XX_ARM_CLK_EN,
+ regmap_update_bits(data->regmap, data->var_data->clk_en,
SC27XX_CLK_ADC_EN | SC27XX_CLK_ADC_CLK_EN, 0);
disable_adc:
- regmap_update_bits(data->regmap, SC27XX_MODULE_EN,
+ regmap_update_bits(data->regmap, data->var_data->module_en,
SC27XX_MODULE_ADC_EN, 0);

return ret;
@@ -470,21 +515,39 @@ static void sc27xx_adc_disable(void *_data)
struct sc27xx_adc_data *data = _data;

/* Disable ADC work clock and controller clock */
- regmap_update_bits(data->regmap, SC27XX_ARM_CLK_EN,
+ regmap_update_bits(data->regmap, data->var_data->clk_en,
SC27XX_CLK_ADC_EN | SC27XX_CLK_ADC_CLK_EN, 0);

- regmap_update_bits(data->regmap, SC27XX_MODULE_EN,
+ regmap_update_bits(data->regmap, data->var_data->module_en,
SC27XX_MODULE_ADC_EN, 0);
}

+static const struct sc27xx_adc_variant_data sc2731_data = {
+ .module_en = SC2731_MODULE_EN,
+ .clk_en = SC2731_ARM_CLK_EN,
+ .scale_shift = SC27XX_ADC_SCALE_SHIFT,
+ .scale_mask = SC27XX_ADC_SCALE_MASK,
+ .bscale_cal = &sc2731_big_scale_graph_calib,
+ .sscale_cal = &sc2731_small_scale_graph_calib,
+ .init_scale = sc2731_adc_scale_init,
+ .get_ratio = sc2731_adc_get_ratio,
+};
+
static int sc27xx_adc_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *np = dev->of_node;
struct sc27xx_adc_data *sc27xx_data;
+ const struct sc27xx_adc_variant_data *pdata;
struct iio_dev *indio_dev;
int ret;

+ pdata = of_device_get_match_data(dev);
+ if (!pdata) {
+ dev_err(dev, "No matching driver data found\n");
+ return -EINVAL;
+ }
+
indio_dev = devm_iio_device_alloc(dev, sizeof(*sc27xx_data));
if (!indio_dev)
return -ENOMEM;
@@ -520,6 +583,8 @@ static int sc27xx_adc_probe(struct platform_device *pdev)
}

sc27xx_data->dev = dev;
+ sc27xx_data->var_data = pdata;
+ sc27xx_data->var_data->init_scale(sc27xx_data);

ret = sc27xx_adc_enable(sc27xx_data);
if (ret) {
@@ -546,7 +611,7 @@ static int sc27xx_adc_probe(struct platform_device *pdev)
}

static const struct of_device_id sc27xx_adc_of_match[] = {
- { .compatible = "sprd,sc2731-adc", },
+ { .compatible = "sprd,sc2731-adc", .data = &sc2731_data},
{ }
};
MODULE_DEVICE_TABLE(of, sc27xx_adc_of_match);
--
2.25.1
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