diff mbox series

[v4,4/6] iio: accel: fxls8962af: add interrupt support

Message ID 20210429122806.3814330-4-sean@geanix.com (mailing list archive)
State New, archived
Headers show
Series [v4,1/6] iio: accel: add support for FXLS8962AF/FXLS8964AF accelerometers | expand

Commit Message

Sean Nyekjaer April 29, 2021, 12:28 p.m. UTC 
Preparation commit for the next that adds hw buffered sampling

Signed-off-by: Sean Nyekjaer <sean@geanix.com>
---
Changes from RFC:
 - Changed of_irq_get_byname -> device_property_match_string?? Lars /
   Andy ??

 drivers/iio/accel/fxls8962af-core.c | 111 ++++++++++++++++++++++++++++
 1 file changed, 111 insertions(+)

Comments

Andy Shevchenko April 30, 2021, 9:02 a.m. UTC | #1 
On Thu, Apr 29, 2021 at 3:28 PM Sean Nyekjaer <sean@geanix.com> wrote:
>
> Preparation commit for the next that adds hw buffered sampling

It misses a better description of what's going on here.
It misses the period at the end of the line.

...

> +#include <linux/of_irq.h>

See below.

...

> +static irqreturn_t fxls8962af_interrupt(int irq, void *p)
> +{
> +       struct iio_dev *indio_dev = p;
> +       struct fxls8962af_data *data = iio_priv(indio_dev);
> +       unsigned int reg;
> +       int ret;
> +
> +       ret = regmap_read(data->regmap, FXLS8962AF_INT_STATUS, &reg);
> +       if (ret < 0)
> +               return IRQ_NONE;
> +
> +       return IRQ_NONE;

And how is it handled?

> +}

...

> +static void fxls8962af_get_irq(struct device *dev, enum fxls8962af_int_pin *pin)
> +{
> +       if (!device_property_match_string(dev, "interrupt-names", "INT2")) {

This doesn't feel right.
You should use fwnode_get_irq() or introduce fwnode_get_irq_by_name().

Since ACPI has no given names for Interrupt resources (and moreover
there are two types of them), it also needs a support from the
software like we have for GPIOs with struct acpi_gpio_table (luckily
it's part of _DSD() nowadays, but in general it's not required by the
spec).

> +               *pin = FXLS8962AF_PIN_INT2;
> +               return;
> +       }
> +
> +       *pin = FXLS8962AF_PIN_INT1;
> +}
Sean Nyekjaer May 3, 2021, 11:19 a.m. UTC | #2 
On 30/04/2021 11.02, Andy Shevchenko wrote:
>> +#include <linux/of_irq.h>
> See below.
> 
> ...
> 
>> +static irqreturn_t fxls8962af_interrupt(int irq, void *p)
>> +{
>> +       struct iio_dev *indio_dev = p;
>> +       struct fxls8962af_data *data = iio_priv(indio_dev);
>> +       unsigned int reg;
>> +       int ret;
>> +
>> +       ret = regmap_read(data->regmap, FXLS8962AF_INT_STATUS, &reg);
>> +       if (ret < 0)
>> +               return IRQ_NONE;
>> +
>> +       return IRQ_NONE;
> And how is it handled?
> 

Interrupt from the accelerometer is not enabled in this patch.
So there is nothing to handle :)
Interrupts are enabled and handled in:
"[PATCH v4 5/6] iio: accel: fxls8962af: add hw buffered sampling"

/Sean
diff mbox series

Patch

diff --git a/drivers/iio/accel/fxls8962af-core.c b/drivers/iio/accel/fxls8962af-core.c
index 9de30e8539b1..3696546fe23a 100644
--- a/drivers/iio/accel/fxls8962af-core.c
+++ b/drivers/iio/accel/fxls8962af-core.c
@@ -15,6 +15,7 @@ 
 #include <linux/bits.h>
 #include <linux/bitfield.h>
 #include <linux/module.h>
+#include <linux/of_irq.h>
 #include <linux/pm_runtime.h>
 #include <linux/regulator/consumer.h>
 #include <linux/regmap.h>
@@ -54,6 +55,10 @@ 
 #define FXLS8962AF_SC3_WAKE_ODR_PREP(x)		FIELD_PREP(FXLS8962AF_SC3_WAKE_ODR_MASK, (x))
 #define FXLS8962AF_SC3_WAKE_ODR_GET(x)		FIELD_GET(FXLS8962AF_SC3_WAKE_ODR_MASK, (x))
 #define FXLS8962AF_SENS_CONFIG4			0x18
+#define FXLS8962AF_SC4_INT_PP_OD_MASK		BIT(1)
+#define FXLS8962AF_SC4_INT_PP_OD_PREP(x)	FIELD_PREP(FXLS8962AF_SC4_INT_PP_OD_MASK, (x))
+#define FXLS8962AF_SC4_INT_POL_MASK		BIT(0)
+#define FXLS8962AF_SC4_INT_POL_PREP(x)		FIELD_PREP(FXLS8962AF_SC4_INT_POL_MASK, (x))
 #define FXLS8962AF_SENS_CONFIG5			0x19
 
 #define FXLS8962AF_WAKE_IDLE_LSB		0x1b
@@ -62,6 +67,9 @@ 
 
 #define FXLS8962AF_INT_EN			0x20
 #define FXLS8962AF_INT_PIN_SEL			0x21
+#define FXLS8962AF_INT_PIN_SEL_MASK		GENMASK(7, 0)
+#define FXLS8962AF_INT_PIN_SEL_INT1		0x00
+#define FXLS8962AF_INT_PIN_SEL_INT2		GENMASK(7, 0)
 
 #define FXLS8962AF_OFF_X			0x22
 #define FXLS8962AF_OFF_Y			0x23
@@ -142,6 +150,11 @@  enum {
 	fxls8962af_idx_ts,
 };
 
+enum fxls8962af_int_pin {
+	FXLS8962AF_PIN_INT1,
+	FXLS8962AF_PIN_INT2,
+};
+
 static int fxls8962af_power_on(struct fxls8962af_data *data)
 {
 	struct device *dev = regmap_get_device(data->regmap);
@@ -506,6 +519,20 @@  static int fxls8962af_reset(struct fxls8962af_data *data)
 	return ret;
 }
 
+static irqreturn_t fxls8962af_interrupt(int irq, void *p)
+{
+	struct iio_dev *indio_dev = p;
+	struct fxls8962af_data *data = iio_priv(indio_dev);
+	unsigned int reg;
+	int ret;
+
+	ret = regmap_read(data->regmap, FXLS8962AF_INT_STATUS, &reg);
+	if (ret < 0)
+		return IRQ_NONE;
+
+	return IRQ_NONE;
+}
+
 static void fxls8962af_regulator_disable(void *data_ptr)
 {
 	struct fxls8962af_data *data = data_ptr;
@@ -525,6 +552,84 @@  static void fxls8962af_pm_disable(void *dev_ptr)
 	fxls8962af_standby(iio_priv(indio_dev));
 }
 
+static void fxls8962af_get_irq(struct device *dev, enum fxls8962af_int_pin *pin)
+{
+	if (!device_property_match_string(dev, "interrupt-names", "INT2")) {
+		*pin = FXLS8962AF_PIN_INT2;
+		return;
+	}
+
+	*pin = FXLS8962AF_PIN_INT1;
+}
+
+static int fxls8962af_irq_setup(struct iio_dev *indio_dev, int irq)
+{
+	struct fxls8962af_data *data = iio_priv(indio_dev);
+	struct device *dev = regmap_get_device(data->regmap);
+	unsigned long irq_type;
+	bool irq_active_high;
+	enum fxls8962af_int_pin int_pin;
+	u8 int_pin_sel;
+	int ret;
+
+	fxls8962af_get_irq(dev, &int_pin);
+	switch (int_pin) {
+	case FXLS8962AF_PIN_INT1:
+		int_pin_sel = FXLS8962AF_INT_PIN_SEL_INT1;
+		break;
+	case FXLS8962AF_PIN_INT2:
+		int_pin_sel = FXLS8962AF_INT_PIN_SEL_INT2;
+		break;
+	default:
+		dev_err(dev, "unsupported int pin selected\n");
+		return -EINVAL;
+	}
+
+	ret = regmap_update_bits(data->regmap, FXLS8962AF_INT_PIN_SEL,
+				 FXLS8962AF_INT_PIN_SEL_MASK,
+				 int_pin_sel);
+	if (ret)
+		return ret;
+
+	irq_type = irqd_get_trigger_type(irq_get_irq_data(irq));
+
+	switch (irq_type) {
+	case IRQF_TRIGGER_HIGH:
+	case IRQF_TRIGGER_RISING:
+		irq_active_high = true;
+		break;
+	case IRQF_TRIGGER_LOW:
+	case IRQF_TRIGGER_FALLING:
+		irq_active_high = false;
+		break;
+	default:
+		dev_info(dev, "mode %lx unsupported\n", irq_type);
+		return -EINVAL;
+	}
+
+	ret = regmap_update_bits(data->regmap, FXLS8962AF_SENS_CONFIG4,
+				 FXLS8962AF_SC4_INT_POL_MASK,
+				 FXLS8962AF_SC4_INT_POL_PREP(irq_active_high));
+	if (ret < 0)
+		return ret;
+
+	if (device_property_read_bool(dev, "drive-open-drain")) {
+		ret = regmap_update_bits(data->regmap, FXLS8962AF_SENS_CONFIG4,
+					 FXLS8962AF_SC4_INT_PP_OD_MASK,
+					 FXLS8962AF_SC4_INT_PP_OD_PREP(1));
+		if (ret < 0)
+			return ret;
+
+		irq_type |= IRQF_SHARED;
+	}
+
+	return devm_request_threaded_irq(dev,
+					 irq,
+					 NULL, fxls8962af_interrupt,
+					 irq_type | IRQF_ONESHOT,
+					 indio_dev->name, indio_dev);
+}
+
 int fxls8962af_core_probe(struct device *dev, struct regmap *regmap, int irq)
 {
 	struct fxls8962af_data *data;
@@ -584,6 +689,12 @@  int fxls8962af_core_probe(struct device *dev, struct regmap *regmap, int irq)
 	if (ret < 0)
 		return ret;
 
+	if (irq) {
+		ret = fxls8962af_irq_setup(indio_dev, irq);
+		if (ret < 0)
+			return ret;
+	}
+
 	ret = pm_runtime_set_active(dev);
 	if (ret < 0)
 		return ret;