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From: Gwendal Grignou <gwendal@chromium.org>
To: dmitry.torokhov@gmail.com, groeck@chromium.org,
	briannorris@chromium.org, jic23@kernel.org, knaack.h@gmx.de,
	lars@metafoo.de, pmeerw@pmeerw.net, lee.jones@linaro.org,
	bleung@chromium.org, enric.balletbo@collabora.com,
	dianders@chromium.org, fabien.lahoudere@collabora.com
Cc: linux-kernel@vger.kernel.org, linux-iio@vger.kernel.org,
	linux-input@vger.kernel.org,
	Gwendal Grignou <gwendal@chromium.org>,
	Jonathan Cameron <Jonathan.Cameron@huawei.com>
Subject: [PATCH v5 17/18] iio: cros_ec: Report hwfifo_watermark_max
Date: Fri, 15 Nov 2019 01:34:11 -0800
Message-ID: <20191115093412.144922-18-gwendal@chromium.org> (raw)
In-Reply-To: <20191115093412.144922-1-gwendal@chromium.org>

Report the maximum amount of sample the EC can hold.
This is not tunable, but can be useful for application to find out the
maximum amount of time it can sleep when hwfifo_timeout is set to a
large number.

Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
---
Changes in v5:
  Added ack.
Changes in v4:
- Check patch with --strict option
    Alignement
No changes in v3.
Changes in v2:
- Remove double lines, add line before return for visibility.

 .../cros_ec_sensors/cros_ec_sensors_core.c    | 33 +++++++++++++++++--
 .../linux/iio/common/cros_ec_sensors_core.h   |  3 ++
 2 files changed, 34 insertions(+), 2 deletions(-)

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 eca39ff9381a..cd095426fc11 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
@@ -23,6 +23,12 @@
 #include <linux/platform_data/cros_ec_sensorhub.h>
 #include <linux/platform_device.h>
 
+/*
+ * Hard coded to the first device to support sensor fifo.  The EC has a 2048
+ * byte fifo and will trigger an interrupt when fifo is 2/3 full.
+ */
+#define CROS_EC_FIFO_SIZE (2048 * 2 / 3)
+
 static char *cros_ec_loc[] = {
 	[MOTIONSENSE_LOC_BASE] = "base",
 	[MOTIONSENSE_LOC_LID] = "lid",
@@ -56,8 +62,15 @@ static int cros_ec_get_host_cmd_version_mask(struct cros_ec_device *ec_dev,
 
 static void get_default_min_max_freq(enum motionsensor_type type,
 				     u32 *min_freq,
-				     u32 *max_freq)
+				     u32 *max_freq,
+				     u32 *max_fifo_events)
 {
+	/*
+	 * We don't know fifo size, set to size previously used by older
+	 * hardware.
+	 */
+	*max_fifo_events = CROS_EC_FIFO_SIZE;
+
 	switch (type) {
 	case MOTIONSENSE_TYPE_ACCEL:
 	case MOTIONSENSE_TYPE_GYRO:
@@ -150,8 +163,21 @@ static IIO_DEVICE_ATTR(hwfifo_timeout, 0644,
 		       cros_ec_sensor_get_report_latency,
 		       cros_ec_sensor_set_report_latency, 0);
 
+static ssize_t hwfifo_watermark_max_show(struct device *dev,
+					 struct device_attribute *attr,
+					 char *buf)
+{
+	struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+	struct cros_ec_sensors_core_state *st = iio_priv(indio_dev);
+
+	return sprintf(buf, "%d\n", st->fifo_max_event_count);
+}
+
+static IIO_DEVICE_ATTR_RO(hwfifo_watermark_max, 0);
+
 const struct attribute *cros_ec_sensor_fifo_attributes[] = {
 	&iio_dev_attr_hwfifo_timeout.dev_attr.attr,
+	&iio_dev_attr_hwfifo_watermark_max.dev_attr.attr,
 	NULL,
 };
 EXPORT_SYMBOL_GPL(cros_ec_sensor_fifo_attributes);
@@ -282,12 +308,15 @@ int cros_ec_sensors_core_init(struct platform_device *pdev,
 		if (state->msg->version < 3) {
 			get_default_min_max_freq(state->resp->info.type,
 						 &state->frequencies[1],
-						 &state->frequencies[2]);
+						 &state->frequencies[2],
+						 &state->fifo_max_event_count);
 		} else {
 			state->frequencies[1] =
 			    state->resp->info_3.min_frequency;
 			state->frequencies[2] =
 			    state->resp->info_3.max_frequency;
+			state->fifo_max_event_count =
+			    state->resp->info_3.fifo_max_event_count;
 		}
 
 		ret = devm_iio_triggered_buffer_setup(dev, indio_dev, NULL,
diff --git a/include/linux/iio/common/cros_ec_sensors_core.h b/include/linux/iio/common/cros_ec_sensors_core.h
index 5b0acc14c891..bc26ae2e3272 100644
--- a/include/linux/iio/common/cros_ec_sensors_core.h
+++ b/include/linux/iio/common/cros_ec_sensors_core.h
@@ -50,6 +50,7 @@ typedef irqreturn_t (*cros_ec_sensors_capture_t)(int irq, void *p);
  *				the timestamp. The timestamp is always last and
  *				is always 8-byte aligned.
  * @read_ec_sensors_data:	function used for accessing sensors values
+ * @fifo_max_event_count:	Size of the EC sensor FIFO
  */
 struct cros_ec_sensors_core_state {
 	struct cros_ec_device *ec;
@@ -72,6 +73,8 @@ struct cros_ec_sensors_core_state {
 	int (*read_ec_sensors_data)(struct iio_dev *indio_dev,
 				    unsigned long scan_mask, s16 *data);
 
+	u32 fifo_max_event_count;
+
 	/* Table of known available frequencies : 0, Min and Max in mHz */
 	int frequencies[3];
 };
-- 
2.24.0.432.g9d3f5f5b63-goog


  parent reply index

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-15  9:33 [PATCH v5 00/18] cros_ec: Add sensorhub driver and FIFO processing Gwendal Grignou
2019-11-15  9:33 ` [PATCH v5 01/18] mfd: cros_ec: Add sensor_count and make check_features public Gwendal Grignou
2019-11-15  9:33 ` [PATCH v5 02/18] platform: cros_ec: Add cros_ec_sensor_hub driver Gwendal Grignou
2019-11-16 11:32   ` Jonathan Cameron
2019-11-15  9:33 ` [PATCH v5 03/18] platform/mfd:iio: cros_ec: Register sensor through sensorhub Gwendal Grignou
2019-11-15  9:33 ` [PATCH v5 04/18] platform: chrome: cros-ec: record event timestamp in the hard irq Gwendal Grignou
2019-11-15  9:33 ` [PATCH v5 05/18] platform: chrome: cros_ec: Do not attempt to register a non-positive IRQ number Gwendal Grignou
2019-11-15  9:34 ` [PATCH v5 06/18] platform: chrome: cros_ec: handle MKBP more events flag Gwendal Grignou
2019-11-15  9:34 ` [PATCH v5 07/18] Revert "Input: cros_ec_keyb - add back missing mask for event_type" Gwendal Grignou
2019-11-15  9:34 ` [PATCH v5 08/18] Revert "Input: cros_ec_keyb: mask out extra flags in event_type" Gwendal Grignou
2019-11-15  9:34 ` [PATCH v5 09/18] platform: chrome: sensorhub: Add FIFO support Gwendal Grignou
2019-11-16 11:39   ` Jonathan Cameron
2019-11-22 11:35   ` Enric Balletbo i Serra
2020-03-24 20:31     ` Gwendal Grignou
2019-11-15  9:34 ` [PATCH v5 10/18] platform: chrome: sensorhub: Add code to spread timestmap Gwendal Grignou
2019-11-15  9:34 ` [PATCH v5 11/18] platform: chrome: sensorhub: Add median filter Gwendal Grignou
2019-11-15  9:34 ` [PATCH v5 12/18] iio: cros_ec: Move function description to .c file Gwendal Grignou
2019-11-15  9:34 ` [PATCH v5 13/18] iio: expose iio_device_set_clock Gwendal Grignou
2019-11-16 11:42   ` Jonathan Cameron
2019-11-15  9:34 ` [PATCH v5 14/18] iio: cros_ec: Register to cros_ec_sensorhub when EC supports FIFO Gwendal Grignou
2019-11-16 11:44   ` Jonathan Cameron
2019-11-15  9:34 ` [PATCH v5 15/18] iio: cros_ec: Remove pm function Gwendal Grignou
2019-11-15  9:34 ` [PATCH v5 16/18] iio: cros_ec: Expose hwfifo_timeout Gwendal Grignou
2019-11-15  9:34 ` Gwendal Grignou [this message]
2019-11-15  9:34 ` [PATCH v5 18/18] iio: cros_ec: Use Hertz as unit for sampling frequency Gwendal Grignou
2019-11-22 11:11 ` [PATCH v5 00/18] cros_ec: Add sensorhub driver and FIFO processing Enric Balletbo i Serra

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