Skip to content

Commit

Permalink
iio: adc: sc27xx: add support for PMIC sc2720 and sc2721
Browse files Browse the repository at this point in the history 
sc2720 and sc2721 is the product of sc27xx series.

Signed-off-by: Yuming Zhu <yuming.zhu1@unisoc.com>
Signed-off-by: Cixi Geng <cixi.geng1@unisoc.com>
  • Loading branch information
@intel-lab-lkp
Cixi Geng authored and intel-lab-lkp committed Jan 6, 2022
1 parent b39db3b commit cd6ab0e
Showing 1 changed file with 198 additions and 0 deletions.
198 changes: 198 additions & 0 deletions drivers/iio/adc/sc27xx_adc.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -9,11 +9,13 @@
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>

/* PMIC global registers definition */
#define SC2731_MODULE_EN 0xc08
#define SC27XX_MODULE_ADC_EN BIT(5)
#define SC2721_ARM_CLK_EN 0xc0c
#define SC2731_ARM_CLK_EN 0xc10
#define SC27XX_CLK_ADC_EN BIT(5)
#define SC27XX_CLK_ADC_CLK_EN BIT(6)
Expand All @@ -37,7 +39,9 @@
/* Bits and mask definition for SC27XX_ADC_CH_CFG register */
#define SC27XX_ADC_CHN_ID_MASK GENMASK(4, 0)
#define SC27XX_ADC_SCALE_MASK GENMASK(10, 9)
#define SC2721_ADC_SCALE_MASK BIT(5)
#define SC27XX_ADC_SCALE_SHIFT 9
#define SC2721_ADC_SCALE_SHIFT 5

/* Bits definitions for SC27XX_ADC_INT_EN registers */
#define SC27XX_ADC_IRQ_EN BIT(0)
Expand Down Expand Up @@ -67,8 +71,21 @@
#define SC27XX_RATIO_NUMERATOR_OFFSET 16
#define SC27XX_RATIO_DENOMINATOR_MASK GENMASK(15, 0)

/* ADC specific channel reference voltage 3.5V */
#define SC27XX_ADC_REFVOL_VDD35 3500000

/* ADC default channel reference voltage is 2.8V */
#define SC27XX_ADC_REFVOL_VDD28 2800000

enum sc27xx_pmic_type {
SC27XX_ADC,
SC2721_ADC,
};

struct sc27xx_adc_data {
struct iio_dev *indio_dev;
struct device *dev;
struct regulator *volref;
struct regmap *regmap;
/*
* One hardware spinlock to synchronize between the multiple
Expand All @@ -87,6 +104,7 @@ struct sc27xx_adc_data {
* in the device data structure.
*/
struct sc27xx_adc_variant_data {
enum sc27xx_pmic_type pmic_type;
u32 module_en;
u32 clk_en;
u32 scale_shift;
Expand Down Expand Up @@ -187,6 +205,94 @@ static int sc27xx_adc_scale_calibration(struct sc27xx_adc_data *data,
return 0;
}

static int sc2720_adc_get_ratio(int channel, int scale)
{
switch (channel) {
case 14:
switch (scale) {
case 0:
return SC27XX_VOLT_RATIO(68, 900);
case 1:
return SC27XX_VOLT_RATIO(68, 1760);
case 2:
return SC27XX_VOLT_RATIO(68, 2327);
case 3:
return SC27XX_VOLT_RATIO(68, 3654);
default:
return SC27XX_VOLT_RATIO(1, 1);
}
case 16:
switch (scale) {
case 0:
return SC27XX_VOLT_RATIO(48, 100);
case 1:
return SC27XX_VOLT_RATIO(480, 1955);
case 2:
return SC27XX_VOLT_RATIO(480, 2586);
case 3:
return SC27XX_VOLT_RATIO(48, 406);
default:
return SC27XX_VOLT_RATIO(1, 1);
}
case 21:
case 22:
case 23:
switch (scale) {
case 0:
return SC27XX_VOLT_RATIO(3, 8);
case 1:
return SC27XX_VOLT_RATIO(375, 1955);
case 2:
return SC27XX_VOLT_RATIO(375, 2586);
case 3:
return SC27XX_VOLT_RATIO(300, 3248);
default:
return SC27XX_VOLT_RATIO(1, 1);
}
default:
switch (scale) {
case 0:
return SC27XX_VOLT_RATIO(1, 1);
case 1:
return SC27XX_VOLT_RATIO(1000, 1955);
case 2:
return SC27XX_VOLT_RATIO(1000, 2586);
case 3:
return SC27XX_VOLT_RATIO(100, 406);
default:
return SC27XX_VOLT_RATIO(1, 1);
}
}
return SC27XX_VOLT_RATIO(1, 1);
}

static int sc2721_adc_get_ratio(int channel, int scale)
{
switch (channel) {
case 1:
case 2:
case 3:
case 4:
return scale ? SC27XX_VOLT_RATIO(400, 1025) :
SC27XX_VOLT_RATIO(1, 1);
case 5:
return SC27XX_VOLT_RATIO(7, 29);
case 7:
case 9:
return scale ? SC27XX_VOLT_RATIO(100, 125) :
SC27XX_VOLT_RATIO(1, 1);
case 14:
return SC27XX_VOLT_RATIO(68, 900);
case 16:
return SC27XX_VOLT_RATIO(48, 100);
case 19:
return SC27XX_VOLT_RATIO(1, 3);
default:
return SC27XX_VOLT_RATIO(1, 1);
}
return SC27XX_VOLT_RATIO(1, 1);
}

static int sc2731_adc_get_ratio(int channel, int scale)
{
switch (channel) {
Expand Down Expand Up @@ -215,6 +321,34 @@ static int sc2731_adc_get_ratio(int channel, int scale)
/*
* According to the datasheet set specific value on some channel.
*/
static void sc2720_adc_scale_init(struct sc27xx_adc_data *data)
{
int i;

for (i = 0; i < SC27XX_ADC_CHANNEL_MAX; i++) {
switch (i) {
case 5:
data->channel_scale[i] = 3;
break;
case 7:
case 9:
data->channel_scale[i] = 2;
break;
case 13:
data->channel_scale[i] = 1;
break;
case 19:
case 30:
case 31:
data->channel_scale[i] = 3;
break;
default:
data->channel_scale[i] = 0;
break;
}
}
}

static void sc2731_adc_scale_init(struct sc27xx_adc_data *data)
{
int i;
Expand All @@ -239,6 +373,24 @@ static int sc27xx_adc_read(struct sc27xx_adc_data *data, int channel,
return ret;
}

/*
* According to the sc2721 chip data sheet, the reference voltage of
* specific channel 30 and channel 31 in ADC module needs to be set from
* the default 2.8v to 3.5v.
*/
if (data->var_data->pmic_type == SC2721_ADC) {
if ((channel == 30) || (channel == 31)) {
ret = regulator_set_voltage(data->volref,
SC27XX_ADC_REFVOL_VDD35,
SC27XX_ADC_REFVOL_VDD35);
if (ret) {
dev_err(data->dev, "failed to set the volref 3.5V\n");
hwspin_unlock_raw(data->hwlock);
return ret;
}
}
}

ret = regmap_update_bits(data->regmap, data->base + SC27XX_ADC_CTL,
SC27XX_ADC_EN, SC27XX_ADC_EN);
if (ret)
Expand Down Expand Up @@ -293,6 +445,16 @@ static int sc27xx_adc_read(struct sc27xx_adc_data *data, int channel,
regmap_update_bits(data->regmap, data->base + SC27XX_ADC_CTL,
SC27XX_ADC_EN, 0);
unlock_adc:
if (data->var_data->pmic_type == SC2721_ADC) {
if ((channel == 30) || (channel == 31)) {
ret = regulator_set_voltage(data->volref,
SC27XX_ADC_REFVOL_VDD28,
SC27XX_ADC_REFVOL_VDD28);
if (ret)
dev_err(data->dev, "failed to set the volref 2.8V\n");
}
}

hwspin_unlock_raw(data->hwlock);

if (!ret)
Expand Down Expand Up @@ -522,6 +684,7 @@ static void sc27xx_adc_disable(void *_data)
}

static const struct sc27xx_adc_variant_data sc2731_data = {
.pmic_type = SC27XX_ADC,
.module_en = SC2731_MODULE_EN,
.clk_en = SC2731_ARM_CLK_EN,
.scale_shift = SC27XX_ADC_SCALE_SHIFT,
Expand All @@ -532,6 +695,30 @@ static const struct sc27xx_adc_variant_data sc2731_data = {
.get_ratio = sc2731_adc_get_ratio,
};

static const struct sc27xx_adc_variant_data sc2721_data = {
.pmic_type = SC2721_ADC,
.module_en = SC2731_MODULE_EN,
.clk_en = SC2721_ARM_CLK_EN,
.scale_shift = SC2721_ADC_SCALE_SHIFT,
.scale_mask = SC2721_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 = sc2721_adc_get_ratio,
};

static const struct sc27xx_adc_variant_data sc2720_data = {
.pmic_type = SC27XX_ADC,
.module_en = SC2731_MODULE_EN,
.clk_en = SC2721_ARM_CLK_EN,
.scale_shift = SC27XX_ADC_SCALE_SHIFT,
.scale_mask = SC27XX_ADC_SCALE_MASK,
.bscale_cal = &big_scale_graph_calib,
.sscale_cal = &small_scale_graph_calib,
.init_scale = sc2720_adc_scale_init,
.get_ratio = sc2720_adc_get_ratio,
};

static int sc27xx_adc_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
Expand Down Expand Up @@ -582,6 +769,15 @@ static int sc27xx_adc_probe(struct platform_device *pdev)
}

sc27xx_data->dev = dev;
if (pdata->pmic_type == SC2721_ADC) {
sc27xx_data->volref = devm_regulator_get_optional(dev, "vref");
if (IS_ERR_OR_NULL(sc27xx_data->volref)) {
ret = PTR_ERR(sc27xx_data->volref);
dev_err(dev, "err! ADC volref, err: %d\n", ret);
return ret;
}
}

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

Expand Down Expand Up @@ -611,6 +807,8 @@ static int sc27xx_adc_probe(struct platform_device *pdev)

static const struct of_device_id sc27xx_adc_of_match[] = {
{ .compatible = "sprd,sc2731-adc", .data = &sc2731_data},
{ .compatible = "sprd,sc2721-adc", .data = &sc2721_data},
{ .compatible = "sprd,sc2720-adc", .data = &sc2720_data},
{ }
};
MODULE_DEVICE_TABLE(of, sc27xx_adc_of_match);
Expand Down

0 comments on commit cd6ab0e

Please sign in to comment.