[PATCH v3 10/30] iio: adc: rework irq and adc_channel handling

Philipp Rossak
2018-08-30T15:44:58Z

We rework the irq handling and the adc_channel handling.
This is requiered since we merge the mfd driver into the adc driver.

Signed-off-by: Philipp Rossak <embed3d@gmail.com>
---
drivers/iio/adc/sun4i-gpadc-iio.c | 157 ++++++++++++++++++++++++--------------
include/linux/mfd/sun4i-gpadc.h | 7 --
2 files changed, 98 insertions(+), 66 deletions(-)

diff --git a/drivers/iio/adc/sun4i-gpadc-iio.c b/drivers/iio/adc/sun4i-gpadc-iio.c
index 658a7e3e3370..a2027614ee0c 100644
--- a/drivers/iio/adc/sun4i-gpadc-iio.c
+++ b/drivers/iio/adc/sun4i-gpadc-iio.c
@@ -49,6 +49,8 @@ static unsigned int sun6i_gpadc_chan_select(unsigned int chan)
return SUN6I_GPADC_CTRL1_ADC_CHAN_SELECT(chan);
}

+struct sun4i_gpadc_iio;
+
struct gpadc_data {
int temp_offset;
int temp_scale;
@@ -56,8 +58,15 @@ struct gpadc_data {
unsigned int tp_adc_select;
unsigned int (*adc_chan_select)(unsigned int chan);
unsigned int adc_chan_mask;
+ bool adc_channel;
+ irqreturn_t (*ths_irq_thread)(int irq, void *dev_id);
+ int (*ths_suspend)(struct sun4i_gpadc_iio *info);
+ int (*ths_resume)(struct sun4i_gpadc_iio *info);
+ bool support_irq;
};

+static irqreturn_t sun4i_gpadc_data_irq_handler(int irq, void *dev_id);
+
static const struct gpadc_data sun4i_gpadc_data = {
.temp_offset = -1932,
.temp_scale = 133,
@@ -65,6 +74,9 @@ static const struct gpadc_data sun4i_gpadc_data = {
.tp_adc_select = SUN4I_GPADC_CTRL1_TP_ADC_SELECT,
.adc_chan_select = &sun4i_gpadc_chan_select,
.adc_chan_mask = SUN4I_GPADC_CTRL1_ADC_CHAN_MASK,
+ .adc_channel = true,
+ .ths_irq_thread = sun4i_gpadc_data_irq_handler,
+ .support_irq = true,
};

static const struct gpadc_data sun5i_gpadc_data = {
@@ -74,6 +86,9 @@ static const struct gpadc_data sun5i_gpadc_data = {
.tp_adc_select = SUN4I_GPADC_CTRL1_TP_ADC_SELECT,
.adc_chan_select = &sun4i_gpadc_chan_select,
.adc_chan_mask = SUN4I_GPADC_CTRL1_ADC_CHAN_MASK,
+ .adc_channel = true,
+ .ths_irq_thread = sun4i_gpadc_data_irq_handler,
+ .support_irq = true,
};

static const struct gpadc_data sun6i_gpadc_data = {
@@ -83,6 +98,9 @@ static const struct gpadc_data sun6i_gpadc_data = {
.tp_adc_select = SUN6I_GPADC_CTRL1_TP_ADC_SELECT,
.adc_chan_select = &sun6i_gpadc_chan_select,
.adc_chan_mask = SUN6I_GPADC_CTRL1_ADC_CHAN_MASK,
+ .adc_channel = true,
+ .ths_irq_thread = sun4i_gpadc_data_irq_handler,
+ .support_irq = true,
};

static const struct gpadc_data sun8i_a33_gpadc_data = {
@@ -96,13 +114,10 @@ struct sun4i_gpadc_iio {
struct completion completion;
int temp_data;
u32 adc_data;
+ unsigned int irq_data_type;
struct regmap *regmap;
- unsigned int fifo_data_irq;
- atomic_t ignore_fifo_data_irq;
- unsigned int temp_data_irq;
- atomic_t ignore_temp_data_irq;
+ unsigned int irq;
const struct gpadc_data *data;
- bool no_irq;
/* prevents concurrent reads of temperature and ADC */
struct mutex mutex;
struct thermal_zone_device *tzd;
@@ -130,6 +145,20 @@ static const struct regmap_config sun4i_gpadc_regmap_config = {
.fast_io = true,
};

+static int sun4i_gpadc_irq_init(struct sun4i_gpadc_iio *info)
+{
+ u32 reg;
+
+ if (info->irq_data_type == SUN4I_GPADC_IRQ_FIFO_DATA)
+ reg = SUN4I_GPADC_INT_FIFOC_TEMP_IRQ_EN;
+ else
+ reg = SUN4I_GPADC_INT_FIFOC_TEMP_IRQ_EN;
+
+ regmap_write(info->regmap, SUN4I_GPADC_INT_FIFOC, reg);
+
+ return 0;
+}
+
static int sun4i_prepare_for_irq(struct iio_dev *indio_dev, int channel,
unsigned int irq)
{
@@ -151,7 +180,7 @@ static int sun4i_prepare_for_irq(struct iio_dev *indio_dev, int channel,
if (ret)
return ret;

- if (irq == info->fifo_data_irq) {
+ if (irq == SUN4I_GPADC_IRQ_FIFO_DATA) {
ret = regmap_write(info->regmap, SUN4I_GPADC_CTRL1,
info->data->tp_mode_en |
info->data->tp_adc_select |
@@ -172,6 +201,8 @@ static int sun4i_prepare_for_irq(struct iio_dev *indio_dev, int channel,
ret = regmap_write(info->regmap, SUN4I_GPADC_CTRL1,
info->data->tp_mode_en);
}
+ if (info->data->support_irq)
+ sun4i_gpadc_irq_init(info);

if (ret)
return ret;
@@ -194,11 +225,12 @@ static int sun4i_gpadc_read(struct iio_dev *indio_dev, int channel, int *val,

mutex_lock(&info->mutex);

+ info->irq_data_type = irq;
ret = sun4i_prepare_for_irq(indio_dev, channel, irq);
if (ret)
goto err;

- enable_irq(irq);
+ enable_irq(info->irq);

/*
* The temperature sensor throws an interruption periodically (currently
@@ -212,7 +244,7 @@ static int sun4i_gpadc_read(struct iio_dev *indio_dev, int channel, int *val,
goto err;
}

- if (irq == info->fifo_data_irq)
+ if (irq == SUN4I_GPADC_IRQ_FIFO_DATA)
*val = info->adc_data;
else
*val = info->temp_data;
@@ -222,7 +254,7 @@ static int sun4i_gpadc_read(struct iio_dev *indio_dev, int channel, int *val,

err:
pm_runtime_put_autosuspend(indio_dev->dev.parent);
- disable_irq(irq);
+ disable_irq(info->irq);
mutex_unlock(&info->mutex);

return ret;
@@ -231,16 +263,15 @@ static int sun4i_gpadc_read(struct iio_dev *indio_dev, int channel, int *val,
static int sun4i_gpadc_adc_read(struct iio_dev *indio_dev, int channel,
int *val)
{
- struct sun4i_gpadc_iio *info = iio_priv(indio_dev);
-
- return sun4i_gpadc_read(indio_dev, channel, val, info->fifo_data_irq);
+ return sun4i_gpadc_read(indio_dev, channel, val,
+ SUN4I_GPADC_IRQ_FIFO_DATA);
}

static int sun4i_gpadc_temp_read(struct iio_dev *indio_dev, int *val)
{
struct sun4i_gpadc_iio *info = iio_priv(indio_dev);

- if (info->no_irq) {
+ if (!info->data->support_irq) {
pm_runtime_get_sync(indio_dev->dev.parent);

regmap_read(info->regmap, SUN4I_GPADC_TEMP_DATA, val);
@@ -251,7 +282,7 @@ static int sun4i_gpadc_temp_read(struct iio_dev *indio_dev, int *val)
return 0;
}

- return sun4i_gpadc_read(indio_dev, 0, val, info->temp_data_irq);
+ return sun4i_gpadc_read(indio_dev, 0, val, SUN4I_GPADC_IRQ_TEMP_DATA);
}

static int sun4i_gpadc_temp_offset(struct iio_dev *indio_dev, int *val)
@@ -320,31 +351,21 @@ static const struct iio_info sun4i_gpadc_iio_info = {
.read_raw = sun4i_gpadc_read_raw,
};

-static irqreturn_t sun4i_gpadc_temp_data_irq_handler(int irq, void *dev_id)
+static irqreturn_t sun4i_gpadc_data_irq_handler(int irq, void *dev_id)
{
struct sun4i_gpadc_iio *info = dev_id;

- if (atomic_read(&info->ignore_temp_data_irq))
- goto out;
-
- if (!regmap_read(info->regmap, SUN4I_GPADC_TEMP_DATA, &info->temp_data))
- complete(&info->completion);
-
-out:
- return IRQ_HANDLED;
-}
-
-static irqreturn_t sun4i_gpadc_fifo_data_irq_handler(int irq, void *dev_id)
-{
- struct sun4i_gpadc_iio *info = dev_id;
-
- if (atomic_read(&info->ignore_fifo_data_irq))
- goto out;
-
- if (!regmap_read(info->regmap, SUN4I_GPADC_DATA, &info->adc_data))
- complete(&info->completion);
-
-out:
+ if (info->irq_data_type == SUN4I_GPADC_IRQ_FIFO_DATA) {
+ /* read fifo data */
+ if (!regmap_read(info->regmap, SUN4I_GPADC_DATA,
+ &info->adc_data))
+ complete(&info->completion);
+ } else {
+ /* read temp data */
+ if (!regmap_read(info->regmap, SUN4I_GPADC_TEMP_DATA,
+ &info->temp_data))
+ complete(&info->completion);
+ }
return IRQ_HANDLED;
}

@@ -356,6 +377,8 @@ static int sun4i_gpadc_runtime_suspend(struct device *dev)
regmap_write(info->regmap, SUN4I_GPADC_CTRL1, 0);
/* Disable temperature sensor on IP */
regmap_write(info->regmap, SUN4I_GPADC_TPR, 0);
+ /* Disable irq*/
+ regmap_write(info->regmap, SUN4I_GPADC_INT_FIFOC, 0);

return 0;
}
@@ -378,6 +401,7 @@ static int sun4i_gpadc_runtime_resume(struct device *dev)
SUN4I_GPADC_TPR_TEMP_ENABLE |
SUN4I_GPADC_TPR_TEMP_PERIOD(800));

+
return 0;
}

@@ -426,8 +450,6 @@ static int sun4i_gpadc_probe_dt(struct platform_device *pdev,
if (!info->data)
return -ENODEV;

- info->no_irq = true;
-
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
base = devm_ioremap_resource(&pdev->dev, mem);
if (IS_ERR(base))
@@ -441,8 +463,25 @@ static int sun4i_gpadc_probe_dt(struct platform_device *pdev,
return ret;
}

- if (IS_ENABLED(CONFIG_THERMAL_OF))
- info->sensor_device = &pdev->dev;
+ if (info->data->support_irq) {
+
+ /* ths interrupt */
+ info->irq = platform_get_irq(pdev, 0);
+
+ ret = devm_request_threaded_irq(&pdev->dev, info->irq,
+ NULL, info->data->ths_irq_thread,
+ IRQF_ONESHOT, dev_name(&pdev->dev), info);
+
+ if (info->data->adc_channel)
+ disable_irq(info->irq);
+
+ if (ret) {
+ dev_err(&pdev->dev, "failed to add ths irq: %d\n", ret);
+ return ret;
+ }
+ }
+
+ info->sensor_device = &pdev->dev;

return 0;
}
@@ -469,6 +508,11 @@ static int sun4i_gpadc_probe(struct platform_device *pdev)
indio_dev->info = &sun4i_gpadc_iio_info;
indio_dev->modes = INDIO_DIRECT_MODE;

+ if (&info->data->adc_channel) {
+ indio_dev->num_channels = ARRAY_SIZE(sun4i_gpadc_channels);
+ indio_dev->channels = sun4i_gpadc_channels;
+ }
+
ret = sun4i_gpadc_probe_dt(pdev, indio_dev);

if (ret)
@@ -480,20 +524,18 @@ static int sun4i_gpadc_probe(struct platform_device *pdev)
pm_runtime_set_suspended(&pdev->dev);
pm_runtime_enable(&pdev->dev);

- if (IS_ENABLED(CONFIG_THERMAL_OF)) {
- info->tzd = thermal_zone_of_sensor_register(info->sensor_device,
- 0, info,
- &sun4i_ts_tz_ops);
- /*
- * Do not fail driver probing when failing to register in
- * thermal because no thermal DT node is found.
- */
- if (IS_ERR(info->tzd) && PTR_ERR(info->tzd) != -ENODEV) {
- dev_err(&pdev->dev,
- "could not register thermal sensor: %ld\n",
- PTR_ERR(info->tzd));
- return PTR_ERR(info->tzd);
- }
+ info->tzd = thermal_zone_of_sensor_register(info->sensor_device,
+ 0, info,
+ &sun4i_ts_tz_ops);
+ /*
+ * Do not fail driver probing when failing to register in
+ * thermal because no thermal DT node is found.
+ */
+ if (IS_ERR(info->tzd) && PTR_ERR(info->tzd) != -ENODEV) {
+ dev_err(&pdev->dev,
+ "could not register thermal sensor: %ld\n",
+ PTR_ERR(info->tzd));
+ return PTR_ERR(info->tzd);
}

ret = devm_iio_device_register(&pdev->dev, indio_dev);
@@ -505,7 +547,7 @@ static int sun4i_gpadc_probe(struct platform_device *pdev)
return 0;

err_map:
- if (!info->no_irq && IS_ENABLED(CONFIG_THERMAL_OF))
+ if (!info->data->support_irq)
iio_map_array_unregister(indio_dev);

pm_runtime_put(&pdev->dev);
@@ -522,12 +564,9 @@ static int sun4i_gpadc_remove(struct platform_device *pdev)
pm_runtime_put(&pdev->dev);
pm_runtime_disable(&pdev->dev);

- if (!IS_ENABLED(CONFIG_THERMAL_OF))
- return 0;
-
thermal_zone_of_sensor_unregister(info->sensor_device, info->tzd);

- if (!info->no_irq)
+ if (!info->data->support_irq)
iio_map_array_unregister(indio_dev);

return 0;
diff --git a/include/linux/mfd/sun4i-gpadc.h b/include/linux/mfd/sun4i-gpadc.h
index 54c7c9375c1b..ca59336f246b 100644
--- a/include/linux/mfd/sun4i-gpadc.h
+++ b/include/linux/mfd/sun4i-gpadc.h
@@ -99,11 +99,4 @@
.datasheet_name = _name, \
}

-struct sun4i_gpadc_dev {
- struct device *dev;
- struct regmap *regmap;
- struct regmap_irq_chip_data *regmap_irqc;
- void __iomem *base;
-};
-
#endif
--
2.11.0