[PATCH v3 22/30] iio: adc: sun4i-gpadc-iio: add support for A83T thermal sensor

Philipp Rossak
2018-08-30T15:45:47Z

This patch adds support for the A83T ths sensor.

The A83T supports interrupts. The interrupt is configured to update the
the sensor values every second.

Signed-off-by: Philipp Rossak <embed3d@gmail.com>
---
drivers/iio/adc/sun4i-gpadc-iio.c | 59 +++++++++++++++++++++++++++++++++++++
include/linux/iio/adc/sun4i-gpadc.h | 6 ++++
2 files changed, 65 insertions(+)

diff --git a/drivers/iio/adc/sun4i-gpadc-iio.c b/drivers/iio/adc/sun4i-gpadc-iio.c
index d5c7971b2558..a184a87c56d4 100644
--- a/drivers/iio/adc/sun4i-gpadc-iio.c
+++ b/drivers/iio/adc/sun4i-gpadc-iio.c
@@ -84,6 +84,8 @@ static int sun8i_h3_ths_resume(struct sun4i_gpadc_iio *info);
static int sun8i_h3_ths_suspend(struct sun4i_gpadc_iio *info);
static irqreturn_t sunx8i_h3_irq_thread(int irq, void *data);

+static int sun8i_a83t_ths_resume(struct sun4i_gpadc_iio *info);
+
static const struct gpadc_data sun4i_gpadc_data = {
.temp_offset = -1932,
.temp_scale = 133,
@@ -158,6 +160,21 @@ static const struct gpadc_data sun8i_h3_ths_data = {
.ths_irq_clear = SUN8I_H3_THS_INTS_TDATA_IRQ_0,
};

+static const struct gpadc_data sun8i_a83t_ths_data = {
+ .temp_offset = -2724,
+ .temp_scale = -70,
+ .temp_data_base = SUN8I_H3_THS_TDATA0,
+ .ths_irq_thread = sunx8i_h3_irq_thread,
+ .support_irq = true,
+ .sensor_count = 3,
+ .supports_nvmem = true,
+ .ths_resume = sun8i_a83t_ths_resume,
+ .ths_suspend = sun8i_h3_ths_suspend,
+ .ths_irq_clear = SUN8I_H3_THS_INTS_TDATA_IRQ_0 |
+ SUN8I_A83T_THS_INTS_TDATA_IRQ_1 |
+ SUN8I_A83T_THS_INTS_TDATA_IRQ_2,
+};
+
struct sun4i_sensor_tzd {
struct sun4i_gpadc_iio *info;
struct thermal_zone_device *tzd;
@@ -541,6 +558,44 @@ static int sun8i_h3_ths_resume(struct sun4i_gpadc_iio *info)
return 0;
}

+static int sun8i_a83t_ths_resume(struct sun4i_gpadc_iio *info)
+{
+ u32 value;
+
+ sun8i_h3_calibrate(info);
+
+ regmap_write(info->regmap, SUN8I_H3_THS_CTRL0,
+ SUN4I_GPADC_CTRL0_T_ACQ(0x13f));
+
+ regmap_write(info->regmap, SUN8I_H3_THS_CTRL2,
+ SUN8I_H3_THS_ACQ1(0x13f));
+
+ regmap_write(info->regmap, SUN8I_H3_THS_STAT,
+ SUN8I_H3_THS_INTS_TDATA_IRQ_0 |
+ SUN8I_A83T_THS_INTS_TDATA_IRQ_1 |
+ SUN8I_A83T_THS_INTS_TDATA_IRQ_2);
+
+ regmap_write(info->regmap, SUN8I_H3_THS_FILTER,
+ SUN4I_GPADC_CTRL3_FILTER_EN |
+ SUN4I_GPADC_CTRL3_FILTER_TYPE(0x2));
+
+ regmap_write(info->regmap, SUN8I_H3_THS_INTC,
+ SUN8I_H3_THS_INTC_TDATA_IRQ_EN0 |
+ SUN8I_A83T_THS_INTC_TDATA_IRQ_EN1 |
+ SUN8I_A83T_THS_INTC_TDATA_IRQ_EN2 |
+ SUN8I_H3_THS_TEMP_PERIOD(0x257));
+
+ regmap_read(info->regmap, SUN8I_H3_THS_CTRL2, &value);
+
+ regmap_write(info->regmap, SUN8I_H3_THS_CTRL2,
+ SUN8I_H3_THS_TEMP_SENSE_EN0 |
+ SUN8I_A83T_THS_TEMP_SENSE_EN1 |
+ SUN8I_A83T_THS_TEMP_SENSE_EN2 |
+ value);
+
+ return 0;
+}
+
static int sun4i_gpadc_get_temp(void *data, int *temp)
{
struct sun4i_sensor_tzd *tzd = data;
@@ -588,6 +643,10 @@ static const struct of_device_id sun4i_gpadc_of_id[] = {
.compatible = "allwinner,sun8i-h3-ths",
.data = &sun8i_h3_ths_data,
},
+ {
+ .compatible = "allwinner,sun8i-a83t-ths",
+ .data = &sun8i_a83t_ths_data,
+ },
{ /* sentinel */ }
};

diff --git a/include/linux/iio/adc/sun4i-gpadc.h b/include/linux/iio/adc/sun4i-gpadc.h
index 169b4de9a34d..673459bb3ec3 100644
--- a/include/linux/iio/adc/sun4i-gpadc.h
+++ b/include/linux/iio/adc/sun4i-gpadc.h
@@ -105,13 +105,19 @@
#define SUN8I_H3_THS_CTRL2 0x40
#define SUN8I_H3_THS_ACQ1(x) (GENMASK(31, 16) & ((x) << 16))
#define SUN8I_H3_THS_TEMP_SENSE_EN0 BIT(0)
+#define SUN8I_A83T_THS_TEMP_SENSE_EN1 BIT(1)
+#define SUN8I_A83T_THS_TEMP_SENSE_EN2 BIT(2)

#define SUN8I_H3_THS_INTC 0x44
#define SUN8I_H3_THS_TEMP_PERIOD(x) (GENMASK(31, 12) & ((x) << 12))
#define SUN8I_H3_THS_INTC_TDATA_IRQ_EN0 BIT(8)
+#define SUN8I_A83T_THS_INTC_TDATA_IRQ_EN1 BIT(9)
+#define SUN8I_A83T_THS_INTC_TDATA_IRQ_EN2 BIT(10)

#define SUN8I_H3_THS_STAT 0x48
#define SUN8I_H3_THS_INTS_TDATA_IRQ_0 BIT(8)
+#define SUN8I_A83T_THS_INTS_TDATA_IRQ_1 BIT(9)
+#define SUN8I_A83T_THS_INTS_TDATA_IRQ_2 BIT(10)

#define SUN8I_H3_THS_FILTER 0x70
#define SUNXI_THS_CDATA_0_1 0x74
--
2.11.0