[PATCH 2/2] iio: common: cros_ec_sensors: set default frequencies

[Fabien Lahoudere <fabien.lahoudere@collabora.com>]

Version 3 of the EC protocol provides min and max frequencies for EC sensors.
Default frequencies are provided for earlier protocol.

Signed-off-by: Fabien Lahoudere <fabien.lahoudere@collabora.com>
Signed-off-by: Nick Vaccaro <nvaccaro@chromium.org>
---
 .../cros_ec_sensors/cros_ec_sensors_core.c    | 44 +++++++++++++++++++
 .../linux/iio/common/cros_ec_sensors_core.h   |  3 ++
 2 files changed, 47 insertions(+)

diff --git a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
index 2e0f97448e64..72f56d54cccd 100644
--- a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
+++ b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
@@ -50,6 +50,37 @@ static int cros_ec_get_host_cmd_version_mask(struct cros_ec_device *ec_dev,
 	return ret;
 }
 
+static void get_default_min_max_freq(enum motionsensor_type type,
+				     u32 *min_freq,
+				     u32 *max_freq)
+{
+	switch (type) {
+	case MOTIONSENSE_TYPE_ACCEL:
+	case MOTIONSENSE_TYPE_GYRO:
+		*min_freq = 12500;
+		*max_freq = 100000;
+		break;
+	case MOTIONSENSE_TYPE_MAG:
+		*min_freq = 5000;
+		*max_freq = 25000;
+		break;
+	case MOTIONSENSE_TYPE_PROX:
+	case MOTIONSENSE_TYPE_LIGHT:
+		*min_freq = 100;
+		*max_freq = 50000;
+		break;
+	case MOTIONSENSE_TYPE_BARO:
+		*min_freq = 250;
+		*max_freq = 20000;
+		break;
+	case MOTIONSENSE_TYPE_ACTIVITY:
+	default:
+		*min_freq = 0;
+		*max_freq = 0;
+		break;
+	}
+}
+
 int cros_ec_sensors_core_init(struct platform_device *pdev,
 			      struct iio_dev *indio_dev,
 			      bool physical_device)
@@ -100,6 +131,19 @@ int cros_ec_sensors_core_init(struct platform_device *pdev,
 		}
 		state->type = state->resp->info.type;
 		state->loc = state->resp->info.location;
+
+		/* Value to stop the device */
+		state->frequencies[0] = 0;
+		if (state->msg->version < 3) {
+			get_default_min_max_freq(state->resp->info.type,
+						 &state->frequencies[1],
+						 &state->frequencies[2]);
+		} else {
+			state->frequencies[1] =
+			    state->resp->info_3.min_frequency;
+			state->frequencies[2] =
+			    state->resp->info_3.max_frequency;
+		}
 	}
 
 	return 0;
diff --git a/include/linux/iio/common/cros_ec_sensors_core.h b/include/linux/iio/common/cros_ec_sensors_core.h
index 0c636b9fe8d7..94c87da22c04 100644
--- a/include/linux/iio/common/cros_ec_sensors_core.h
+++ b/include/linux/iio/common/cros_ec_sensors_core.h
@@ -70,6 +70,9 @@ struct cros_ec_sensors_core_state {
 				    unsigned long scan_mask, s16 *data);
 
 	int curr_sampl_freq;
+
+	/* Disable, Min and Max Sampling Frequency in mHz */
+	int frequencies[3];
 };
 
 /**
-- 
2.20.1