Re: [PATCH 6/7] iio: adc: sc27xx: add support for PMIC ump9620

From: Baolin Wang
Date: Fri Jan 07 2022 - 02:23:05 EST

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In reply to: Cixi Geng: "[PATCH 6/7] iio: adc: sc27xx: add support for PMIC ump9620"
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On Thu, Jan 6, 2022 at 9:00 PM Cixi Geng <gengcixi@xxxxxxxxx> wrote:
>
> From: Cixi Geng <cixi.geng1@xxxxxxxxxx>
>
> The ump9620 is variant from sc27xx chip, add it in here.
>
> Signed-off-by: Yuming Zhu <yuming.zhu1@xxxxxxxxxx>
> Signed-off-by: Cixi Geng <cixi.geng1@xxxxxxxxxx>
> ---
> drivers/iio/adc/sc27xx_adc.c | 263 +++++++++++++++++++++++++++++++++--
> 1 file changed, 254 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/iio/adc/sc27xx_adc.c b/drivers/iio/adc/sc27xx_adc.c
> index 195f44cf61e1..68b967f32498 100644
> --- a/drivers/iio/adc/sc27xx_adc.c
> +++ b/drivers/iio/adc/sc27xx_adc.c
> @@ -15,12 +15,16 @@
> /* PMIC global registers definition */
> #define SC2730_MODULE_EN 0x1808
> #define SC2731_MODULE_EN 0xc08
> +#define UMP9620_MODULE_EN 0x2008
> #define SC27XX_MODULE_ADC_EN BIT(5)
> #define SC2721_ARM_CLK_EN 0xc0c
> #define SC2730_ARM_CLK_EN 0x180c
> #define SC2731_ARM_CLK_EN 0xc10
> +#define UMP9620_ARM_CLK_EN 0x200c
> +#define UMP9620_XTL_WAIT_CTRL0 0x2378
> #define SC27XX_CLK_ADC_EN BIT(5)
> #define SC27XX_CLK_ADC_CLK_EN BIT(6)
> +#define UMP9620_XTL_WAIT_CTRL0_EN BIT(8)
>
> /* ADC controller registers definition */
> #define SC27XX_ADC_CTL 0x0
> @@ -82,6 +86,13 @@
> enum sc27xx_pmic_type {
> SC27XX_ADC,
> SC2721_ADC,
> + UMP9620_ADC,
> +};
> +
> +enum ump96xx_scale_cal {
> + UMP96XX_VBAT_SENSES_CAL,
> + UMP96XX_VBAT_DET_CAL,
> + UMP96XX_CH1_CAL,
> };
>
> struct sc27xx_adc_data {
> @@ -140,6 +151,11 @@ static struct sc27xx_adc_linear_graph small_scale_graph = {
> 100, 341,
> };
>
> +static struct sc27xx_adc_linear_graph ump9620_bat_det_graph = {
> + 1400, 3482,
> + 200, 476,
> +};
> +
> static const struct sc27xx_adc_linear_graph sc2731_big_scale_graph_calib = {
> 4200, 850,
> 3600, 728,
> @@ -165,6 +181,33 @@ static int sc27xx_adc_get_calib_data(u32 calib_data, int calib_adc)
> return ((calib_data & 0xff) + calib_adc - 128) * 4;
> }
>
> +static int adc_nvmem_cell_calib_data(struct sc27xx_adc_data *data, const char *cell_name)
> +{
> + struct nvmem_cell *cell;
> + void *buf;
> + u32 calib_data = 0;
> + size_t len = 0;
> +
> + if (!data)
> + return -EINVAL;
> +
> + cell = nvmem_cell_get(data->dev, cell_name);
> + if (IS_ERR_OR_NULL(cell))
> + return PTR_ERR(cell);
> +
> + buf = nvmem_cell_read(cell, &len);
> + if (IS_ERR_OR_NULL(buf)) {
> + nvmem_cell_put(cell);
> + return PTR_ERR(buf);
> + }
> +
> + memcpy(&calib_data, buf, min(len, sizeof(u32)));
> +
> + kfree(buf);
> + nvmem_cell_put(cell);
> + return calib_data;
> +}

These are some duplicated code in sc27xx_adc_scale_calibration(),
please factor out the sc27xx_adc_scale_calibration() firstly.

> +
> static int sc27xx_adc_scale_calibration(struct sc27xx_adc_data *data,
> bool big_scale)
> {
> @@ -207,6 +250,56 @@ static int sc27xx_adc_scale_calibration(struct sc27xx_adc_data *data,
> return 0;
> }
>
> +static int ump96xx_adc_scale_cal(struct sc27xx_adc_data *data,
> + enum ump96xx_scale_cal cal_type)
> +{
> + struct sc27xx_adc_linear_graph *graph = NULL;
> + const char *cell_name1 = NULL, *cell_name2 = NULL;
> + int adc_calib_data1 = 0, adc_calib_data2 = 0;
> +
> + if (!data)
> + return -EINVAL;
> +
> + if (cal_type == UMP96XX_VBAT_DET_CAL) {
> + graph = &ump9620_bat_det_graph;
> + cell_name1 = "vbat_det_cal1";
> + cell_name2 = "vbat_det_cal2";
> + } else if (cal_type == UMP96XX_VBAT_SENSES_CAL) {
> + graph = &big_scale_graph;
> + cell_name1 = "big_scale_calib1";
> + cell_name2 = "big_scale_calib2";
> + } else if (cal_type == UMP96XX_CH1_CAL) {
> + graph = &small_scale_graph;
> + cell_name1 = "small_scale_calib1";
> + cell_name2 = "small_scale_calib2";
> + } else {
> + graph = &small_scale_graph;
> + cell_name1 = "small_scale_calib1";
> + cell_name2 = "small_scale_calib2";
> + }
> +
> + adc_calib_data1 = adc_nvmem_cell_calib_data(data, cell_name1);
> + if (adc_calib_data1 < 0) {
> + dev_err(data->dev, "err! %s:%d\n", cell_name1, adc_calib_data1);
> + return adc_calib_data1;
> + }
> +
> + adc_calib_data2 = adc_nvmem_cell_calib_data(data, cell_name2);
> + if (adc_calib_data2 < 0) {
> + dev_err(data->dev, "err! %s:%d\n", cell_name2, adc_calib_data2);
> + return adc_calib_data2;
> + }
> +
> + /*
> + *Read the data in the two blocks of efuse and convert them into the
> + *calibration value in the ump9620 adc linear graph.
> + */
> + graph->adc0 = (adc_calib_data1 & 0xfff0) >> 4;
> + graph->adc1 = (adc_calib_data2 & 0xfff0) >> 4;
> +
> + return 0;
> +}
> +
> static int sc2720_adc_get_ratio(int channel, int scale)
> {
> switch (channel) {
> @@ -394,6 +487,50 @@ static int sc2731_adc_get_ratio(int channel, int scale)
> return SC27XX_VOLT_RATIO(1, 1);
> }
>
> +static int ump9620_adc_get_ratio(int channel, int scale)
> +{
> + switch (channel) {
> + case 11:
> + return SC27XX_VOLT_RATIO(1, 1);
> + case 14:
> + switch (scale) {
> + case 0:
> + return SC27XX_VOLT_RATIO(68, 900);
> + default:
> + return SC27XX_VOLT_RATIO(1, 1);
> + }
> + case 15:
> + switch (scale) {
> + case 0:
> + return SC27XX_VOLT_RATIO(1, 3);
> + default:
> + return SC27XX_VOLT_RATIO(1, 1);
> + }
> + case 21:
> + case 22:
> + case 23:
> + switch (scale) {
> + case 0:
> + return SC27XX_VOLT_RATIO(3, 8);
> + 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, 2600);
> + case 3:
> + return SC27XX_VOLT_RATIO(1000, 4060);
> + default:
> + return SC27XX_VOLT_RATIO(1, 1);
> + }
> + }
> +}
> +
> /*
> * According to the datasheet set specific value on some channel.
> */
> @@ -453,6 +590,22 @@ static void sc2731_adc_scale_init(struct sc27xx_adc_data *data)
> }
> }
>
> +static void ump9620_adc_scale_init(struct sc27xx_adc_data *data)
> +{
> + int i;
> +
> + for (i = 0; i < SC27XX_ADC_CHANNEL_MAX; i++) {
> + if (i == 10 || i == 19 || i == 30 || i == 31)
> + data->channel_scale[i] = 3;
> + else if (i == 7 || i == 9)
> + data->channel_scale[i] = 2;
> + else if (i == 0 || i == 13)
> + 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)
> {
> @@ -578,6 +731,23 @@ static int sc27xx_adc_to_volt(struct sc27xx_adc_linear_graph *graph,
> return tmp < 0 ? 0 : tmp;
> }
>
> +static int ump96xx_adc_to_volt(struct sc27xx_adc_linear_graph *graph, int scale,
> + int raw_adc)
> +{
> + int tmp;
> +
> + tmp = (graph->volt0 - graph->volt1) * (raw_adc - graph->adc1);
> + tmp /= (graph->adc0 - graph->adc1);
> + tmp += graph->volt1;

These are also copy-paste from sc27xx_adc_to_volt(), please avoid
duplicate code.

> +
> + if (scale == 2)
> + tmp = tmp * 2600 / 1000;
> + else if (scale == 3)
> + tmp = tmp * 4060 / 1000;
> +
> + return tmp < 0 ? 0 : tmp;
> +}
> +
> static int sc27xx_adc_convert_volt(struct sc27xx_adc_data *data, int channel,
> int scale, int raw_adc)
> {
> @@ -608,6 +778,39 @@ static int sc27xx_adc_convert_volt(struct sc27xx_adc_data *data, int channel,
> return DIV_ROUND_CLOSEST(volt * denominator, numerator);
> }
>
> +static int ump96xx_adc_convert_volt(struct sc27xx_adc_data *data, int channel,
> + int scale, int raw_adc)
> +{
> + u32 numerator, denominator;
> + u32 volt;
> +
> + switch (channel) {
> + case 0:
> + if (scale == 1)
> + volt = sc27xx_adc_to_volt(&ump9620_bat_det_graph, raw_adc);
> + else
> + volt = ump96xx_adc_to_volt(&small_scale_graph, scale, raw_adc);
> + break;
> + case 11:
> + volt = sc27xx_adc_to_volt(&big_scale_graph, raw_adc);
> + break;
> + default:
> + if (scale == 1)
> + volt = sc27xx_adc_to_volt(&ump9620_bat_det_graph, raw_adc);
> + else
> + volt = ump96xx_adc_to_volt(&small_scale_graph, scale, raw_adc);
> + break;
> + }
> +
> + if (channel == 0 && scale == 1)
> + return volt;
> +
> + sc27xx_adc_volt_ratio(data, channel, scale, &numerator, &denominator);
> +
> + return DIV_ROUND_CLOSEST(volt * denominator, numerator);
> +}
> +
> +
> static int sc27xx_adc_read_processed(struct sc27xx_adc_data *data,
> int channel, int scale, int *val)
> {
> @@ -617,7 +820,11 @@ static int sc27xx_adc_read_processed(struct sc27xx_adc_data *data,
> if (ret)
> return ret;
>
> - *val = sc27xx_adc_convert_volt(data, channel, scale, raw_adc);
> + if (data->var_data->pmic_type == UMP9620_ADC)
> + *val = ump96xx_adc_convert_volt(data, channel, scale, raw_adc);
> + else
> + *val = sc27xx_adc_convert_volt(data, channel, scale, raw_adc);
> +
> return 0;
> }
>
> @@ -735,21 +942,42 @@ static int sc27xx_adc_enable(struct sc27xx_adc_data *data)
> if (ret)
> return ret;
>
> - /* Enable ADC work clock and controller clock */
> + /* Enable 26MHz crvstal oscillator wait cycles for UMP9620 ADC */
> + if (data->var_data->pmic_type == UMP9620_ADC) {
> + ret = regmap_update_bits(data->regmap, UMP9620_XTL_WAIT_CTRL0,
> + UMP9620_XTL_WAIT_CTRL0_EN,
> + UMP9620_XTL_WAIT_CTRL0_EN);
> + }
> +
> + /* Enable ADC work clock */
> 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)
> goto disable_adc;
>
> - /* ADC channel scales' calibration from nvmem device */
> - ret = sc27xx_adc_scale_calibration(data, true);
> - if (ret)
> - goto disable_clk;
> + /* ADC channel scales calibration from nvmem device */
> + if (data->var_data->pmic_type == UMP9620_ADC) {
> + ret = ump96xx_adc_scale_cal(data, UMP96XX_VBAT_SENSES_CAL);
> + if (ret)
> + goto disable_clk;
>
> - ret = sc27xx_adc_scale_calibration(data, false);
> - if (ret)
> - goto disable_clk;
> + ret = ump96xx_adc_scale_cal(data, UMP96XX_VBAT_DET_CAL);
> + if (ret)
> + goto disable_clk;
> +
> + ret = ump96xx_adc_scale_cal(data, UMP96XX_CH1_CAL);
> + if (ret)
> + goto disable_clk;
> + } else {
> + 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;
>
> @@ -773,6 +1001,10 @@ static void sc27xx_adc_disable(void *_data)
>
> regmap_update_bits(data->regmap, data->var_data->module_en,
> SC27XX_MODULE_ADC_EN, 0);
> +
> + if (data->var_data->pmic_type == UMP9620_ADC)
> + regmap_update_bits(data->regmap, UMP9620_XTL_WAIT_CTRL0,
> + UMP9620_XTL_WAIT_CTRL0_EN, 0);
> }
>
> static const struct sc27xx_adc_variant_data sc2731_data = {
> @@ -823,6 +1055,18 @@ static const struct sc27xx_adc_variant_data sc2720_data = {
> .get_ratio = sc2720_adc_get_ratio,
> };
>
> +static const struct sc27xx_adc_variant_data ump9620_data = {
> + .pmic_type = UMP9620_ADC,
> + .module_en = UMP9620_MODULE_EN,
> + .clk_en = UMP9620_ARM_CLK_EN,
> + .scale_shift = SC27XX_ADC_SCALE_SHIFT,
> + .scale_mask = SC27XX_ADC_SCALE_MASK,
> + .bscale_cal = &big_scale_graph,
> + .sscale_cal = &small_scale_graph,
> + .init_scale = ump9620_adc_scale_init,
> + .get_ratio = ump9620_adc_get_ratio,
> +};
> +
> static int sc27xx_adc_probe(struct platform_device *pdev)
> {
> struct device *dev = &pdev->dev;
> @@ -914,6 +1158,7 @@ static const struct of_device_id sc27xx_adc_of_match[] = {
> { .compatible = "sprd,sc2730-adc", .data = &sc2730_data},
> { .compatible = "sprd,sc2721-adc", .data = &sc2721_data},
> { .compatible = "sprd,sc2720-adc", .data = &sc2720_data},
> + { .compatible = "sprd,ump9620-adc", .data = &ump9620_data},
> { }
> };
> MODULE_DEVICE_TABLE(of, sc27xx_adc_of_match);
> --
> 2.25.1
>

--
Baolin Wang

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In reply to: Cixi Geng: "[PATCH 6/7] iio: adc: sc27xx: add support for PMIC ump9620"
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