linux-kernel - [PATCH v4 4/4] iio: cros_ec_accel_legacy: Add support for veyron-minnie

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20190628191711.23584-5-gwendal@chromium.org>
Date:   Fri, 28 Jun 2019 12:17:11 -0700
From:   Gwendal Grignou <gwendal@...omium.org>
To:     jic23@...nel.org, bleung@...omium.org,
        enric.balletbo@...labora.com, groeck@...omium.org,
        fabien.lahoudere@...labora.com, dianders@...omium.org
Cc:     linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
        Gwendal Grignou <gwendal@...omium.org>
Subject: [PATCH v4 4/4] iio: cros_ec_accel_legacy: Add support for veyron-minnie

Veyron minnie embedded controller presents 2 accelerometers using an
older interface. Add function to query the data in cros_ec_accel.

Verify accelerometers on veyron-minnie are presented and working.

Signed-off-by: Gwendal Grignou <gwendal@...omium.org>
---
 drivers/iio/accel/cros_ec_accel_legacy.c | 40 ++++++++++++++++++++++--
 1 file changed, 38 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/accel/cros_ec_accel_legacy.c b/drivers/iio/accel/cros_ec_accel_legacy.c
index 2399f0cbdf2b..2c6196446d90 100644
--- a/drivers/iio/accel/cros_ec_accel_legacy.c
+++ b/drivers/iio/accel/cros_ec_accel_legacy.c
@@ -5,7 +5,7 @@
  * Copyright 2017 Google, Inc
  *
  * This driver uses the memory mapper cros-ec interface to communicate
- * with the Chrome OS EC about accelerometer data.
+ * with the Chrome OS EC about accelerometer data or older commands.
  * Accelerometer access is presented through iio sysfs.
  */
 
@@ -33,6 +33,39 @@
  */
 #define ACCEL_LEGACY_NSCALE 9586168
 
+static int cros_ec_accel_legacy_read_cmd(struct iio_dev *indio_dev,
+				  unsigned long scan_mask, s16 *data)
+{
+	struct cros_ec_sensors_core_state *st = iio_priv(indio_dev);
+	int ret;
+	unsigned int i;
+	u8 sensor_num;
+
+	/*
+	 * Read all sensor data through a command.
+	 * Save sensor_num, it is assumed to stay.
+	 */
+	sensor_num = st->param.info.sensor_num;
+	st->param.cmd = MOTIONSENSE_CMD_DUMP;
+	st->param.dump.max_sensor_count = CROS_EC_SENSOR_LEGACY_NUM;
+	ret = cros_ec_motion_send_host_cmd(st,
+			sizeof(st->resp->dump) + CROS_EC_SENSOR_LEGACY_NUM *
+			sizeof(struct ec_response_motion_sensor_data));
+	st->param.info.sensor_num = sensor_num;
+	if (ret != 0) {
+		dev_warn(&indio_dev->dev, "Unable to read sensor data\n");
+		return ret;
+	}
+
+	for_each_set_bit(i, &scan_mask, indio_dev->masklength) {
+		*data = st->resp->dump.sensor[sensor_num].data[i] *
+			st->sign[i];
+		data++;
+	}
+
+	return 0;
+}
+
 static int cros_ec_accel_legacy_read(struct iio_dev *indio_dev,
 				     struct iio_chan_spec const *chan,
 				     int *val, int *val2, long mask)
@@ -149,7 +182,10 @@ static int cros_ec_accel_legacy_probe(struct platform_device *pdev)
 	indio_dev->info = &cros_ec_accel_legacy_info;
 	state = iio_priv(indio_dev);
 
-	state->read_ec_sensors_data = cros_ec_sensors_read_lpc;
+	if (state->ec->cmd_readmem != NULL)
+		state->read_ec_sensors_data = cros_ec_sensors_read_lpc;
+	else
+		state->read_ec_sensors_data = cros_ec_accel_legacy_read_cmd;
 
 	indio_dev->channels = cros_ec_accel_legacy_channels;
 	indio_dev->num_channels = ARRAY_SIZE(cros_ec_accel_legacy_channels);
-- 
2.22.0.410.gd8fdbe21b5-goog