[PATCH v3] Added tilt interrupt support in inv_icm42600

[Hiten Chauhan <hiten.chauhan@siliconsignals.io>]

Description:
Add new device attribute to enable and disable
Tilt interrupt from kernel user space

Signed-off-by: Hiten Chauhan <hiten.chauhan@siliconsignals.io>

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202311170235.HaVJnmWa-lkp@intel.com/
---
 drivers/iio/imu/inv_icm42600/inv_icm42600.h   |  24 ++++
 .../iio/imu/inv_icm42600/inv_icm42600_accel.c | 129 ++++++++++++++++++
 2 files changed, 153 insertions(+)

diff --git a/drivers/iio/imu/inv_icm42600/inv_icm42600.h b/drivers/iio/imu/inv_icm42600/inv_icm42600.h
index 0e290c807b0f..39ed39e77deb 100644
--- a/drivers/iio/imu/inv_icm42600/inv_icm42600.h
+++ b/drivers/iio/imu/inv_icm42600/inv_icm42600.h
@@ -187,6 +187,8 @@ struct inv_icm42600_state {
 #define INV_ICM42600_FIFO_CONFIG_STOP_ON_FULL		\
 		FIELD_PREP(INV_ICM42600_FIFO_CONFIG_MASK, 2)
 
+#define INV_ICM42600_REG_MASK        GENMASK(7, 0)
+
 /* all sensor data are 16 bits (2 registers wide) in big-endian */
 #define INV_ICM42600_REG_TEMP_DATA			0x001D
 #define INV_ICM42600_REG_ACCEL_DATA_X			0x001F
@@ -239,6 +241,7 @@ struct inv_icm42600_state {
 #define INV_ICM42600_REG_PWR_MGMT0			0x004E
 #define INV_ICM42600_PWR_MGMT0_TEMP_DIS			BIT(5)
 #define INV_ICM42600_PWR_MGMT0_IDLE			BIT(4)
+#define INV_ICM42600_PWR_ACCEL_MODE			BIT(1)
 #define INV_ICM42600_PWR_MGMT0_GYRO(_mode)		\
 		FIELD_PREP(GENMASK(3, 2), (_mode))
 #define INV_ICM42600_PWR_MGMT0_ACCEL(_mode)		\
@@ -306,6 +309,21 @@ struct inv_icm42600_state {
 #define INV_ICM42600_WHOAMI_ICM42622			0x46
 #define INV_ICM42600_WHOAMI_ICM42631			0x5C
 
+/* Register configs for tilt interrupt */
+#define INV_ICM42605_REG_APEX_CONFIG4                  0x4043
+#define INV_ICM42605_APEX_CONFIG4_MASK                 GENMASK(7, 0)
+
+#define INV_ICM42605_REG_APEX_CONFIG0                  0x0056
+#define INV_ICM42605_APEX_CONFIG0_TILT_ENABLE          BIT(4)
+#define INV_ICM42605_APEX_CONFIG0                      BIT(1)
+
+#define INV_ICM42605_REG_INTF_CONFIG1                   0x404D
+#define INV_ICM42605_INTF_CONFIG1_MASK                  GENMASK(5, 0)
+#define INV_ICM42605_INTF_CONFIG1_TILT_DET_INT1_EN      BIT(3)
+
+#define INV_ICM42605_REG_INT_STATUS3                   0x0038
+
+
 /* User bank 1 (MSB 0x10) */
 #define INV_ICM42600_REG_SENSOR_CONFIG0			0x1003
 #define INV_ICM42600_SENSOR_CONFIG0_ZG_DISABLE		BIT(5)
@@ -364,6 +382,8 @@ typedef int (*inv_icm42600_bus_setup)(struct inv_icm42600_state *);
 extern const struct regmap_config inv_icm42600_regmap_config;
 extern const struct dev_pm_ops inv_icm42600_pm_ops;
 
+extern uint8_t inv_icm42605_int_reg;
+
 const struct iio_mount_matrix *
 inv_icm42600_get_mount_matrix(const struct iio_dev *indio_dev,
 			      const struct iio_chan_spec *chan);
@@ -395,4 +415,8 @@ struct iio_dev *inv_icm42600_accel_init(struct inv_icm42600_state *st);
 
 int inv_icm42600_accel_parse_fifo(struct iio_dev *indio_dev);
 
+int inv_icm42605_generate_tilt_interrupt(struct inv_icm42600_state *st);
+
+int inv_icm42605_disable_tilt_interrupt(struct inv_icm42600_state *st);
+
 #endif
diff --git a/drivers/iio/imu/inv_icm42600/inv_icm42600_accel.c b/drivers/iio/imu/inv_icm42600/inv_icm42600_accel.c
index b1e4fde27d25..311f6ea09e64 100644
--- a/drivers/iio/imu/inv_icm42600/inv_icm42600_accel.c
+++ b/drivers/iio/imu/inv_icm42600/inv_icm42600_accel.c
@@ -47,6 +47,8 @@
 		.ext_info = _ext_info,					\
 	}
 
+uint8_t inv_icm42605_int_reg;
+
 enum inv_icm42600_accel_scan {
 	INV_ICM42600_ACCEL_SCAN_X,
 	INV_ICM42600_ACCEL_SCAN_Y,
@@ -60,6 +62,68 @@ static const struct iio_chan_spec_ext_info inv_icm42600_accel_ext_infos[] = {
 	{},
 };
 
+static ssize_t tilt_interrupt_show(struct device *dev,
+			       struct device_attribute *attr, char *buf)
+{
+	struct inv_icm42600_state *st = dev_get_drvdata(dev);
+	unsigned int val;
+	int ret;
+
+	ret = regmap_read(st->map, inv_icm42605_int_reg, &val);
+
+	if (ret != 0)
+		return ret;
+
+	snprintf(buf, PAGE_SIZE, "Read reg %x value %x\n", inv_icm42605_int_reg, val);
+
+	return strlen(buf);
+}
+
+static ssize_t tilt_interrupt_store(struct device *dev,
+		struct device_attribute *attr, const char *buf,
+		size_t count)
+{
+	struct inv_icm42600_state *st = dev_get_drvdata(dev);
+	int ret;
+	int value;
+
+	if (!st)
+		return -EINVAL;
+
+	if (kstrtoint(buf, 10, &value))
+		return -EINVAL;
+
+	inv_icm42605_int_reg = INV_ICM42605_REG_INT_STATUS3;
+
+	switch (value) {
+	case 1:
+		ret = inv_icm42605_generate_tilt_interrupt(st);
+		if (ret != 0)
+			return -EIO;
+		break;
+	case 0:
+		ret = inv_icm42605_disable_tilt_interrupt(st);
+		if (ret != 0)
+			return -EIO;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return count;
+}
+
+static DEVICE_ATTR_RW(tilt_interrupt);
+
+static struct attribute *icm42605_attrs[] = {
+	&dev_attr_tilt_interrupt.attr,
+	NULL,
+};
+
+static const struct attribute_group icm42605_attrs_group = {
+	.attrs = icm42605_attrs,
+};
+
 static const struct iio_chan_spec inv_icm42600_accel_channels[] = {
 	INV_ICM42600_ACCEL_CHAN(IIO_MOD_X, INV_ICM42600_ACCEL_SCAN_X,
 				inv_icm42600_accel_ext_infos),
@@ -702,6 +766,7 @@ static const struct iio_info inv_icm42600_accel_info = {
 	.update_scan_mode = inv_icm42600_accel_update_scan_mode,
 	.hwfifo_set_watermark = inv_icm42600_accel_hwfifo_set_watermark,
 	.hwfifo_flush_to_buffer = inv_icm42600_accel_hwfifo_flush,
+	.attrs = &icm42605_attrs_group,
 };
 
 struct iio_dev *inv_icm42600_accel_init(struct inv_icm42600_state *st)
@@ -791,3 +856,67 @@ int inv_icm42600_accel_parse_fifo(struct iio_dev *indio_dev)
 
 	return 0;
 }
+
+int inv_icm42605_generate_tilt_interrupt(struct inv_icm42600_state *st)
+{
+	int ret;
+	int val;
+	char sleep = 10;
+
+	ret = regmap_update_bits(st->map, INV_ICM42605_REG_APEX_CONFIG4,
+				 INV_ICM42605_APEX_CONFIG4_MASK, 0);
+	if (ret)
+		return ret;
+
+	val = INV_ICM42600_PWR_ACCEL_MODE;
+	ret = regmap_write(st->map, INV_ICM42600_REG_PWR_MGMT0, val);
+	if (ret)
+		return ret;
+
+	val = INV_ICM42605_APEX_CONFIG0;
+	ret = regmap_write(st->map, INV_ICM42605_REG_APEX_CONFIG0, val);
+	if (ret)
+		return ret;
+
+	val = INV_ICM42600_SIGNAL_PATH_RESET_DMP_MEM_RESET;
+	ret = regmap_write(st->map, INV_ICM42600_REG_SIGNAL_PATH_RESET, val);
+	if (ret)
+		return ret;
+
+	msleep(sleep);
+
+	val = INV_ICM42600_SIGNAL_PATH_RESET_DMP_INIT_EN;
+	ret = regmap_write(st->map, INV_ICM42600_REG_SIGNAL_PATH_RESET, val);
+	if (ret)
+		return ret;
+
+	val = INV_ICM42605_APEX_CONFIG0_TILT_ENABLE |
+	      INV_ICM42605_APEX_CONFIG0;
+	ret = regmap_write(st->map, INV_ICM42605_REG_APEX_CONFIG0, val);
+	if (ret)
+		return ret;
+
+	ret = regmap_update_bits(st->map, INV_ICM42605_REG_INTF_CONFIG1,
+				 INV_ICM42605_INTF_CONFIG1_MASK,
+				 INV_ICM42605_INTF_CONFIG1_TILT_DET_INT1_EN);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+int inv_icm42605_disable_tilt_interrupt(struct inv_icm42600_state *st)
+{
+	int ret;
+
+	ret = regmap_write(st->map, INV_ICM42605_REG_APEX_CONFIG0, 0);
+	if (ret)
+		return ret;
+
+	ret = regmap_update_bits(st->map, INV_ICM42605_REG_INTF_CONFIG1,
+			INV_ICM42605_INTF_CONFIG1_MASK, 0);
+	if (ret)
+		return ret;
+
+	return 0;
+}

base-commit: b85ea95d086471afb4ad062012a4d73cd328fa86
-- 
2.25.1