[PATCH 08/16] iio: adc: sun4i-gpadc-iio: rework: add interrupt support

[Philipp Rossak <embed3d-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

This patch rewors the driver to support interrupts for the thermal part
of the sensor.

This is only available for the newer sensor (currently H3 and A83T).
The interrupt will be trigerd on data available and triggers the update
for the thermal sensors. All newer sensors have different amount of
sensors and different interrupts for each device the reset of the
interrupts need to be done different

For the newer sensors is the autosuspend disabled.

Signed-off-by: Philipp Rossak <embed3d-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
 drivers/iio/adc/sun4i-gpadc-iio.c | 68 +++++++++++++++++++++++++++++++++++----
 include/linux/mfd/sun4i-gpadc.h   | 33 +++++++++++++++++++
 2 files changed, 95 insertions(+), 6 deletions(-)

diff --git a/drivers/iio/adc/sun4i-gpadc-iio.c b/drivers/iio/adc/sun4i-gpadc-iio.c
index 7b12666cdd9e..77e07f042730 100644
--- a/drivers/iio/adc/sun4i-gpadc-iio.c
+++ b/drivers/iio/adc/sun4i-gpadc-iio.c
@@ -78,11 +78,14 @@ struct gpadc_data {
 	u32		ctrl2_map;
 	u32		sensor_en_map;
 	u32		filter_map;
+	u32		irq_clear_map;
+	u32		irq_control_map;
 	bool		has_bus_clk;
 	bool		has_bus_rst;
 	bool		has_mod_clk;
 	int		sensor_count;
 	bool		supports_nvmem;
+	bool		support_irq;
 };
 
 static const struct gpadc_data sun4i_gpadc_data = {
@@ -97,6 +100,7 @@ static const struct gpadc_data sun4i_gpadc_data = {
 	.sample_end = sun4i_gpadc_sample_end,
 	.sensor_count = 1,
 	.supports_nvmem = false,
+	.support_irq = false,
 };
 
 static const struct gpadc_data sun5i_gpadc_data = {
@@ -111,6 +115,7 @@ static const struct gpadc_data sun5i_gpadc_data = {
 	.sample_end = sun4i_gpadc_sample_end,
 	.sensor_count = 1,
 	.supports_nvmem = false,
+	.support_irq = false,
 };
 
 static const struct gpadc_data sun6i_gpadc_data = {
@@ -125,6 +130,7 @@ static const struct gpadc_data sun6i_gpadc_data = {
 	.sample_end = sun4i_gpadc_sample_end,
 	.sensor_count = 1,
 	.supports_nvmem = false,
+	.support_irq = false,
 };
 
 static const struct gpadc_data sun8i_a33_gpadc_data = {
@@ -136,6 +142,7 @@ static const struct gpadc_data sun8i_a33_gpadc_data = {
 	.sample_end = sun4i_gpadc_sample_end,
 	.sensor_count = 1,
 	.supports_nvmem = false,
+	.support_irq = false,
 };
 
 struct sun4i_gpadc_iio {
@@ -339,6 +346,11 @@ static int sun4i_gpadc_temp_read(struct iio_dev *indio_dev, int *val,
 		return 0;
 	}
 
+	if (info->data->support_irq) {
+		regmap_read(info->regmap, info->data->temp_data[sensor], val);
+		return 0;
+	}
+
 	return sun4i_gpadc_read(indio_dev, 0, val, info->temp_data_irq);
 }
 
@@ -436,6 +448,17 @@ static irqreturn_t sun4i_gpadc_fifo_data_irq_handler(int irq, void *dev_id)
 	return IRQ_HANDLED;
 }
 
+static irqreturn_t sunxi_irq_thread(int irq, void *data)
+{
+	struct sun4i_gpadc_iio *info = data;
+
+	regmap_write(info->regmap, SUNXI_THS_STAT, info->data->irq_clear_map);
+
+	thermal_zone_device_update(info->tzd, THERMAL_EVENT_TEMP_SAMPLE);
+
+	return IRQ_HANDLED;
+}
+
 static int sun4i_gpadc_sample_end(struct sun4i_gpadc_iio *info)
 {
 	/* Disable the ADC on IP */
@@ -448,6 +471,8 @@ static int sun4i_gpadc_sample_end(struct sun4i_gpadc_iio *info)
 
 static int sunxi_ths_sample_end(struct sun4i_gpadc_iio *info)
 {
+	/* Disable ths interrupt*/
+	regmap_write(info->regmap, SUNXI_THS_INTC, 0x0);
 	/* Disable temperature sensor */
 	regmap_write(info->regmap, SUNXI_THS_CTRL2, 0x0);
 
@@ -509,9 +534,15 @@ static int sunxi_ths_sample_start(struct sun4i_gpadc_iio *info)
 	regmap_write(info->regmap, SUNXI_THS_CTRL2,
 		info->data->ctrl2_map);
 
+	regmap_write(info->regmap, SUNXI_THS_STAT,
+			info->data->irq_clear_map);
+
 	regmap_write(info->regmap, SUNXI_THS_FILTER,
 		info->data->filter_map);
 
+	regmap_write(info->regmap, SUNXI_THS_INTC,
+		info->data->irq_control_map);
+
 	regmap_read(info->regmap, SUNXI_THS_CTRL2, &value);
 
 	regmap_write(info->regmap, SUNXI_THS_CTRL2,
@@ -625,12 +656,29 @@ static int sun4i_gpadc_probe_dt(struct platform_device *pdev,
 	struct nvmem_cell *cell;
 	ssize_t cell_size;
 	u64 *cell_data;
+	int irq;
 
 	info->data = of_device_get_match_data(&pdev->dev);
 	if (!info->data)
 		return -ENODEV;
 
-	info->no_irq = true;
+	if (info->data->support_irq) {
+		/* only the new versions of ths support right now irqs */
+		irq = platform_get_irq(pdev, 0);
+		if (irq < 0) {
+			dev_err(&pdev->dev, "failed to get IRQ: %d\n", irq);
+			return irq;
+		}
+
+		ret = devm_request_threaded_irq(&pdev->dev, irq, NULL,
+				sunxi_irq_thread, IRQF_ONESHOT,
+				dev_name(&pdev->dev), info);
+		if (ret)
+			return ret;
+
+	} else
+		info->no_irq = true;
+
 	indio_dev->num_channels = ARRAY_SIZE(sun8i_a33_gpadc_channels);
 	indio_dev->channels = sun8i_a33_gpadc_channels;
 
@@ -840,11 +888,13 @@ static int sun4i_gpadc_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
-	pm_runtime_set_autosuspend_delay(&pdev->dev,
-					 SUN4I_GPADC_AUTOSUSPEND_DELAY);
-	pm_runtime_use_autosuspend(&pdev->dev);
-	pm_runtime_set_suspended(&pdev->dev);
-	pm_runtime_enable(&pdev->dev);
+	if (!info->data->support_irq) {
+		pm_runtime_set_autosuspend_delay(&pdev->dev,
+						 SUN4I_GPADC_AUTOSUSPEND_DELAY);
+		pm_runtime_use_autosuspend(&pdev->dev);
+		pm_runtime_set_suspended(&pdev->dev);
+		pm_runtime_enable(&pdev->dev);
+	}
 
 	if (IS_ENABLED(CONFIG_THERMAL_OF)) {
 		for (i = 0; i < info->data->sensor_count; i++) {
@@ -865,6 +915,9 @@ static int sun4i_gpadc_probe(struct platform_device *pdev)
 		}
 	}
 
+	if (info->data->support_irq)
+		info->data->sample_start(info);
+
 	ret = devm_iio_device_register(&pdev->dev, indio_dev);
 	if (ret < 0) {
 		dev_err(&pdev->dev, "could not register the device\n");
@@ -894,6 +947,9 @@ static int sun4i_gpadc_remove(struct platform_device *pdev)
 	if (!IS_ENABLED(CONFIG_THERMAL_OF))
 		return 0;
 
+	if (info->data->support_irq)
+		info->data->sample_end(info);
+
 	thermal_zone_of_sensor_unregister(info->sensor_device, info->tzd);
 
 	if (!info->no_irq)
diff --git a/include/linux/mfd/sun4i-gpadc.h b/include/linux/mfd/sun4i-gpadc.h
index c251002431bd..ab34a96a7ff3 100644
--- a/include/linux/mfd/sun4i-gpadc.h
+++ b/include/linux/mfd/sun4i-gpadc.h
@@ -89,6 +89,8 @@
 /* SUNXI_THS COMMON REGISTERS + DEFINES */
 #define SUNXI_THS_CTRL0					0x00
 #define SUNXI_THS_CTRL2					0x40
+#define SUNXI_THS_INTC					0x44
+#define SUNXI_THS_STAT					0x48
 #define SUNXI_THS_FILTER				0x70
 #define SUNXI_THS_CDATA_0_1				0x74
 #define SUNXI_THS_CDATA_2_3				0x78
@@ -107,6 +109,37 @@
 #define SUNXI_THS_TEMP_SENSE_EN2			BIT(2)
 #define SUNXI_THS_TEMP_SENSE_EN3			BIT(3)
 
+#define SUNXI_THS_TEMP_PERIOD(x)			(GENMASK(31, 12) & ((x) << 12))
+
+#define SUNXI_THS_INTS_ALARM_OFF_2			BIT(14)
+#define SUNXI_THS_INTS_ALARM_OFF_1			BIT(13)
+#define SUNXI_THS_INTS_ALARM_OFF_0			BIT(12)
+#define SUNXI_THS_INTS_TDATA_IRQ_3			BIT(11)
+#define SUNXI_THS_INTS_TDATA_IRQ_2			BIT(10)
+#define SUNXI_THS_INTS_TDATA_IRQ_1			BIT(9)
+#define SUNXI_THS_INTS_TDATA_IRQ_0			BIT(8)
+#define SUNXI_THS_INTS_SHUT_INT_3			BIT(7)
+#define SUNXI_THS_INTS_SHUT_INT_2			BIT(6)
+#define SUNXI_THS_INTS_SHUT_INT_1			BIT(5)
+#define SUNXI_THS_INTS_SHUT_INT_0			BIT(4)
+#define SUNXI_THS_INTS_ALARM_INT_3			BIT(3)
+#define SUNXI_THS_INTS_ALARM_INT_2			BIT(2)
+#define SUNXI_THS_INTS_ALARM_INT_1			BIT(1)
+#define SUNXI_THS_INTS_ALARM_INT_0			BIT(0)
+
+#define SUNXI_THS_INTC_TDATA_IRQ_EN3			BIT(11)
+#define SUNXI_THS_INTC_TDATA_IRQ_EN2			BIT(10)
+#define SUNXI_THS_INTC_TDATA_IRQ_EN1			BIT(9)
+#define SUNXI_THS_INTC_TDATA_IRQ_EN0			BIT(8)
+#define SUNXI_THS_INTC_SHUT_INT_EN3			BIT(7)
+#define SUNXI_THS_INTC_SHUT_INT_EN2			BIT(6)
+#define SUNXI_THS_INTC_SHUT_INT_EN1			BIT(5)
+#define SUNXI_THS_INTC_SHUT_INT_EN0			BIT(4)
+#define SUNXI_THS_INTC_ALARM_INT_EN3			BIT(3)
+#define SUNXI_THS_INTC_ALARM_INT_EN2			BIT(2)
+#define SUNXI_THS_INTC_ALARM_INT_EN1			BIT(1)
+#define SUNXI_THS_INTC_ALARM_INT_EN0			BIT(0)
+
 #define MAX_SENSOR_COUNT				4
 
 struct sun4i_gpadc_dev {
-- 
2.11.0