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[PATCH v2 0/5] mfd: cros-ec: Some fixes and improvements.

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  [PATCH v2 0/5]  mfd: cros-ec: Some fixes and improvements. Enric Balletbo i Serra <enric.balletbo@collabora.com> - 2017-04-03 18:40 +0200
    [PATCH v2 5/5] mfd: cros_ec: add RTC as mfd subdevice Enric Balletbo i Serra <enric.balletbo@collabora.com> - 2017-04-03 18:40 +0200
    [PATCH v2 1/5] mfd: cros-ec: Fix host command buffer size Enric Balletbo i Serra <enric.balletbo@collabora.com> - 2017-04-03 18:40 +0200
    [PATCH v2 2/5] mfd: cros_ec: Get rid of cros_ec_check_features from cros_ec_dev. Enric Balletbo i Serra <enric.balletbo@collabora.com> - 2017-04-03 18:40 +0200
    [PATCH v2 3/5] mfd: cros_ec: Introduce RTC commands and events definitions. Enric Balletbo i Serra <enric.balletbo@collabora.com> - 2017-04-03 18:40 +0200
    [PATCH v2 4/5] rtc: cros-ec: add cros-ec-rtc driver. Enric Balletbo i Serra <enric.balletbo@collabora.com> - 2017-04-03 18:40 +0200

#1615397 — [PATCH v2 0/5] mfd: cros-ec: Some fixes and improvements.

Dear all,

This is another patch series to fix and improve some cros-ec mfd related
things.

 * 1/5 mfd: cros-ec: Fix host command buffer size

  This patch is a FIX, and I think that would be interesting see it merged
in this release cycle. This should go through the MFD tree and can be picked
independently of the other patches. Lee Jones I think this is for you.

 * 2/5 mfd: cros_ec: Get rid of cros_ec_check_features from cros_ec_dev.

  As pointed by Lee Jones in this thread [1] we should not use the MFD API
outside of MFD. For this reason the cros-ec-rtc did not get accepted yet.
The reality is that we are calling mfd_add_devices from cros-ec-dev driver
already, so this patch get rid off the MFD calls inside the chardev driver
and moves to cros-ec MFD. Also I think the chardev device should simply
implement the ioctl calls to access to it from userspace.

 The above patch involves MFD, IIO and platform chrome subsystems.

 * 3/5 mfd: cros_ec: Introduce RTC commands and events definitions
 * 4/5 rtc: cros-ec: add cros-ec-rtc driver
 * 5/5 mfd: cros_ec: add RTC as mfd subdevice

 These patches are the cros-ec RTC driver, 3 and 4 patches are already
acked by the subsystem maintainers involved and are equal to the last
version I send. Patch 5 registers the rtc cell inside the cros-ec MFD
intead of cros-ec-dev chardev driver.

 Note that these 3 patches depends on [2] to build. I recommend apply
these series on top of [3]

Changes since v1:
 - Removed patch 'iio: cros_ec_sensors: Fix return value to get raw and
   calibbias data' from series as was already picked.
 - Removed patch 'iio: cros_ec_sensors: Fix return value to get raw and
   calibbias data' from series as was already picked.
 - Patch 2/5: Acked-by: Jonathan Cameron <jic23@kernel.org>

[1] https://www.spinics.net/lists/kernel/msg2465099.html
[2] https://lkml.org/lkml/2017/3/17/319
[3] https://lkml.org/lkml/2017/3/17/321

Best regards,

Enric Balletbo i Serra (1):
  mfd: cros_ec: Get rid of cros_ec_check_features from cros_ec_dev.

Stephen Barber (3):
  mfd: cros_ec: Introduce RTC commands and events definitions.
  rtc: cros-ec: add cros-ec-rtc driver.
  mfd: cros_ec: add RTC as mfd subdevice

Vic Yang (1):
  mfd: cros-ec: Fix host command buffer size

 .../iio/common/cros_ec_sensors/cros_ec_sensors.c   |   8 -
 .../common/cros_ec_sensors/cros_ec_sensors_core.c  |   8 +-
 drivers/iio/light/cros_ec_light_prox.c             |   8 -
 drivers/iio/pressure/cros_ec_baro.c                |   8 -
 drivers/mfd/cros_ec.c                              | 178 +++++++++
 drivers/platform/chrome/cros_ec_dev.c              | 161 --------
 drivers/rtc/Kconfig                                |  10 +
 drivers/rtc/Makefile                               |   1 +
 drivers/rtc/rtc-cros-ec.c                          | 412 +++++++++++++++++++++
 include/linux/mfd/cros_ec.h                        |   9 +-
 include/linux/mfd/cros_ec_commands.h               |   8 +
 11 files changed, 621 insertions(+), 190 deletions(-)
 create mode 100644 drivers/rtc/rtc-cros-ec.c

-- 
2.9.3

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#1615398 — [PATCH v2 5/5] mfd: cros_ec: add RTC as mfd subdevice

From: Stephen Barber <smbarber@chromium.org>

If the EC supports RTC host commands, expose an RTC device.

Signed-off-by: Stephen Barber <smbarber@chromium.org>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
---

Changes since v1:
 - Use PLATFORM_DEVID_AUTO to add the subdevice.

 drivers/mfd/cros_ec.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/mfd/cros_ec.c b/drivers/mfd/cros_ec.c
index bbc17ab..76874be 100644
--- a/drivers/mfd/cros_ec.c
+++ b/drivers/mfd/cros_ec.c
@@ -51,6 +51,10 @@ static const struct mfd_cell ec_pd_cell = {
 	.pdata_size = sizeof(pd_p),
 };
 
+static const struct mfd_cell ec_rtc_cell = {
+	.name = "cros-ec-rtc",
+};
+
 static irqreturn_t ec_irq_thread(int irq, void *data)
 {
 	struct cros_ec_device *ec_dev = data;
@@ -238,6 +242,16 @@ static void cros_ec_sensors_register(struct cros_ec_device *ec_dev)
 	kfree(msg);
 }
 
+static void cros_ec_rtc_register(struct cros_ec_device *ec_dev)
+{
+	int ret;
+
+	ret = mfd_add_devices(ec_dev->dev, PLATFORM_DEVID_AUTO, &ec_rtc_cell,
+			      1, NULL, 0, NULL);
+	if (ret)
+		dev_err(ec_dev->dev, "failed to add EC RTC\n");
+}
+
 int cros_ec_register(struct cros_ec_device *ec_dev)
 {
 	struct device *dev = ec_dev->dev;
@@ -287,6 +301,10 @@ int cros_ec_register(struct cros_ec_device *ec_dev)
 	if (cros_ec_check_features(ec_dev, EC_FEATURE_MOTION_SENSE))
 		cros_ec_sensors_register(ec_dev);
 
+	/* Check whether this EC has RTC support */
+	if (cros_ec_check_features(ec_dev, EC_FEATURE_RTC))
+		cros_ec_rtc_register(ec_dev);
+
 	if (ec_dev->max_passthru) {
 		/*
 		 * Register a PD device as well on top of this device.
-- 
2.9.3

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#1615399 — [PATCH v2 1/5] mfd: cros-ec: Fix host command buffer size

From: Vic Yang <victoryang@google.com>

For SPI, we can get up to 32 additional bytes for response preamble.
The current overhead (2 bytes) may cause problems when we try to receive
a big response. Update it to 32 bytes.

Without this fix we could see a kernel BUG when we receive a big response
from the Chrome EC when is connected via SPI.

Signed-off-by: Vic Yang <victoryang@google.com>
Tested-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
---

  This patch is a FIX, and I think that would be interesting see it merged
in this release cycle. This should go through the MFD tree and can be picked
independently of the other patches. Lee Jones I think this is for you.

Changes since v1:
 - None

 include/linux/mfd/cros_ec.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/linux/mfd/cros_ec.h b/include/linux/mfd/cros_ec.h
index b3e812f..3b16c90 100644
--- a/include/linux/mfd/cros_ec.h
+++ b/include/linux/mfd/cros_ec.h
@@ -35,10 +35,11 @@
  * Max bus-specific overhead incurred by request/responses.
  * I2C requires 1 additional byte for requests.
  * I2C requires 2 additional bytes for responses.
+ * SPI requires up to 32 additional bytes for responses.
  * */
 #define EC_PROTO_VERSION_UNKNOWN	0
 #define EC_MAX_REQUEST_OVERHEAD		1
-#define EC_MAX_RESPONSE_OVERHEAD	2
+#define EC_MAX_RESPONSE_OVERHEAD	32
 
 /*
  * Command interface between EC and AP, for LPC, I2C and SPI interfaces.
-- 
2.9.3

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#1615403 — [PATCH v2 2/5] mfd: cros_ec: Get rid of cros_ec_check_features from cros_ec_dev.

The cros_ec_dev driver should be used only to expose the Chrome OS Embedded
Controller to user-space and should not be used to add MFD devices by
calling mfd_add_devices. This patch moves this logic to the MFD cros_ec
driver and removes the MFD bits from the character device driver. Also
makes independent the IIO driver from the character device as also has no
sense.

Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Acked-by: Jonathan Cameron <jic23@kernel.org>
---

  As pointed by Lee Jones in this thread [1] we should not use the MFD API
outside of MFD. For this reason the cros-ec-rtc did not get accepted yet.
The reality is that we are calling mfd_add_devices from cros-ec-dev driver
already, so this patch get rid off the MFD calls inside the chardev driver
and moves to cros-ec MFD. Also I think the chardev device should simply
implement the ioctl calls to access to it from userspace.

Changes since v1:
 - Acked-by: Jonathan Cameron <jic23@kernel.org>

[1]  https://www.spinics.net/lists/kernel/msg2465099.html

 .../iio/common/cros_ec_sensors/cros_ec_sensors.c   |   8 -
 .../common/cros_ec_sensors/cros_ec_sensors_core.c  |   8 +-
 drivers/iio/light/cros_ec_light_prox.c             |   8 -
 drivers/iio/pressure/cros_ec_baro.c                |   8 -
 drivers/mfd/cros_ec.c                              | 160 ++++++++++++++++++++
 drivers/platform/chrome/cros_ec_dev.c              | 161 ---------------------
 include/linux/mfd/cros_ec.h                        |   6 +-
 7 files changed, 170 insertions(+), 189 deletions(-)

diff --git a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c
index 38e8783..9b53a01 100644
--- a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c
+++ b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c
@@ -191,19 +191,11 @@ static const struct iio_info ec_sensors_info = {
 static int cros_ec_sensors_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
-	struct cros_ec_dev *ec_dev = dev_get_drvdata(dev->parent);
-	struct cros_ec_device *ec_device;
 	struct iio_dev *indio_dev;
 	struct cros_ec_sensors_state *state;
 	struct iio_chan_spec *channel;
 	int ret, i;
 
-	if (!ec_dev || !ec_dev->ec_dev) {
-		dev_warn(&pdev->dev, "No CROS EC device found.\n");
-		return -EINVAL;
-	}
-	ec_device = ec_dev->ec_dev;
-
 	indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*state));
 	if (!indio_dev)
 		return -ENOMEM;
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 416cae5..0cdb64a 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
@@ -41,12 +41,13 @@ int cros_ec_sensors_core_init(struct platform_device *pdev,
 {
 	struct device *dev = &pdev->dev;
 	struct cros_ec_sensors_core_state *state = iio_priv(indio_dev);
-	struct cros_ec_dev *ec = dev_get_drvdata(pdev->dev.parent);
+	struct cros_ec_device *ec_dev = dev_get_drvdata(pdev->dev.parent);
 	struct cros_ec_sensor_platform *sensor_platform = dev_get_platdata(dev);
 
 	platform_set_drvdata(pdev, indio_dev);
 
-	state->ec = ec->ec_dev;
+	state->ec = ec_dev;
+
 	state->msg = devm_kzalloc(&pdev->dev,
 				max((u16)sizeof(struct ec_params_motion_sense),
 				state->ec->max_response), GFP_KERNEL);
@@ -59,7 +60,8 @@ int cros_ec_sensors_core_init(struct platform_device *pdev,
 
 	/* Set up the host command structure. */
 	state->msg->version = 2;
-	state->msg->command = EC_CMD_MOTION_SENSE_CMD + ec->cmd_offset;
+	state->msg->command = EC_CMD_MOTION_SENSE_CMD +
+				sensor_platform->cmd_offset;
 	state->msg->outsize = sizeof(struct ec_params_motion_sense);
 
 	indio_dev->dev.parent = &pdev->dev;
diff --git a/drivers/iio/light/cros_ec_light_prox.c b/drivers/iio/light/cros_ec_light_prox.c
index 7217223..2133ddc 100644
--- a/drivers/iio/light/cros_ec_light_prox.c
+++ b/drivers/iio/light/cros_ec_light_prox.c
@@ -181,19 +181,11 @@ static const struct iio_info cros_ec_light_prox_info = {
 static int cros_ec_light_prox_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
-	struct cros_ec_dev *ec_dev = dev_get_drvdata(dev->parent);
-	struct cros_ec_device *ec_device;
 	struct iio_dev *indio_dev;
 	struct cros_ec_light_prox_state *state;
 	struct iio_chan_spec *channel;
 	int ret;
 
-	if (!ec_dev || !ec_dev->ec_dev) {
-		dev_warn(dev, "No CROS EC device found.\n");
-		return -EINVAL;
-	}
-	ec_device = ec_dev->ec_dev;
-
 	indio_dev = devm_iio_device_alloc(dev, sizeof(*state));
 	if (!indio_dev)
 		return -ENOMEM;
diff --git a/drivers/iio/pressure/cros_ec_baro.c b/drivers/iio/pressure/cros_ec_baro.c
index 48b2a30..dbea18b 100644
--- a/drivers/iio/pressure/cros_ec_baro.c
+++ b/drivers/iio/pressure/cros_ec_baro.c
@@ -126,19 +126,11 @@ static const struct iio_info cros_ec_baro_info = {
 static int cros_ec_baro_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
-	struct cros_ec_dev *ec_dev = dev_get_drvdata(dev->parent);
-	struct cros_ec_device *ec_device;
 	struct iio_dev *indio_dev;
 	struct cros_ec_baro_state *state;
 	struct iio_chan_spec *channel;
 	int ret;
 
-	if (!ec_dev || !ec_dev->ec_dev) {
-		dev_warn(dev, "No CROS EC device found.\n");
-		return -EINVAL;
-	}
-	ec_device = ec_dev->ec_dev;
-
 	indio_dev = devm_iio_device_alloc(dev, sizeof(*state));
 	if (!indio_dev)
 		return -ENOMEM;
diff --git a/drivers/mfd/cros_ec.c b/drivers/mfd/cros_ec.c
index d4a407e..bbc17ab 100644
--- a/drivers/mfd/cros_ec.c
+++ b/drivers/mfd/cros_ec.c
@@ -84,6 +84,160 @@ static int cros_ec_sleep_event(struct cros_ec_device *ec_dev, u8 sleep_event)
 	return cros_ec_cmd_xfer(ec_dev, &buf.msg);
 }
 
+static int cros_ec_check_features(struct cros_ec_device *ec_dev, int feature)
+{
+	struct cros_ec_command *msg;
+	int ret;
+
+	if (ec_dev->features[0] == -1U && ec_dev->features[1] == -1U) {
+		/* features bitmap not read yet */
+
+		msg = kmalloc(sizeof(*msg) + sizeof(ec_dev->features),
+			      GFP_KERNEL);
+		if (!msg)
+			return -ENOMEM;
+
+		msg->version = 0;
+		msg->command = EC_CMD_GET_FEATURES + ec_p.cmd_offset;
+		msg->insize = sizeof(ec_dev->features);
+		msg->outsize = 0;
+
+		ret = cros_ec_cmd_xfer(ec_dev, msg);
+		if (ret < 0 || msg->result != EC_RES_SUCCESS) {
+			dev_warn(ec_dev->dev, "cannot get EC features: %d/%d\n",
+				 ret, msg->result);
+			memset(ec_dev->features, 0, sizeof(ec_dev->features));
+		}
+
+		memcpy(ec_dev->features, msg->data, sizeof(ec_dev->features));
+
+		dev_dbg(ec_dev->dev, "EC features %08x %08x\n",
+			ec_dev->features[0], ec_dev->features[1]);
+
+		kfree(msg);
+	}
+
+	return ec_dev->features[feature / 32] & EC_FEATURE_MASK_0(feature);
+}
+
+static void cros_ec_sensors_register(struct cros_ec_device *ec_dev)
+{
+	/*
+	 * Issue a command to get the number of sensor reported.
+	 * Build an array of sensors driver and register them all.
+	 */
+	int ret, i, id, sensor_num;
+	struct mfd_cell *sensor_cells;
+	struct cros_ec_sensor_platform *sensor_platforms;
+	int sensor_type[MOTIONSENSE_TYPE_MAX];
+	struct ec_params_motion_sense *params;
+	struct ec_response_motion_sense *resp;
+	struct cros_ec_command *msg;
+
+	msg = kzalloc(sizeof(struct cros_ec_command) +
+		      max(sizeof(*params), sizeof(*resp)), GFP_KERNEL);
+	if (msg == NULL)
+		return;
+
+	msg->version = 2;
+	msg->command = EC_CMD_MOTION_SENSE_CMD + ec_p.cmd_offset;
+	msg->outsize = sizeof(*params);
+	msg->insize = sizeof(*resp);
+
+	params = (struct ec_params_motion_sense *)msg->data;
+	params->cmd = MOTIONSENSE_CMD_DUMP;
+
+	ret = cros_ec_cmd_xfer(ec_dev, msg);
+	if (ret < 0 || msg->result != EC_RES_SUCCESS) {
+		dev_warn(ec_dev->dev, "cannot get EC sensor information: %d/%d\n",
+			 ret, msg->result);
+		goto error;
+	}
+
+	resp = (struct ec_response_motion_sense *)msg->data;
+	sensor_num = resp->dump.sensor_count;
+	/* Allocate 2 extra sensors in case lid angle or FIFO are needed */
+	sensor_cells = kzalloc(sizeof(struct mfd_cell) * (sensor_num + 2),
+			       GFP_KERNEL);
+	if (sensor_cells == NULL)
+		goto error;
+
+	sensor_platforms = kzalloc(sizeof(struct cros_ec_sensor_platform) *
+		  (sensor_num + 1), GFP_KERNEL);
+	if (sensor_platforms == NULL)
+		goto error_platforms;
+
+	memset(sensor_type, 0, sizeof(sensor_type));
+	id = 0;
+	for (i = 0; i < sensor_num; i++) {
+		params->cmd = MOTIONSENSE_CMD_INFO;
+		params->info.sensor_num = i;
+		ret = cros_ec_cmd_xfer(ec_dev, msg);
+		if (ret < 0 || msg->result != EC_RES_SUCCESS) {
+			dev_warn(ec_dev->dev, "no info for EC sensor %d : %d/%d\n",
+				 i, ret, msg->result);
+			continue;
+		}
+		switch (resp->info.type) {
+		case MOTIONSENSE_TYPE_ACCEL:
+			sensor_cells[id].name = "cros-ec-accel";
+			break;
+		case MOTIONSENSE_TYPE_BARO:
+			sensor_cells[id].name = "cros-ec-baro";
+			break;
+		case MOTIONSENSE_TYPE_GYRO:
+			sensor_cells[id].name = "cros-ec-gyro";
+			break;
+		case MOTIONSENSE_TYPE_MAG:
+			sensor_cells[id].name = "cros-ec-mag";
+			break;
+		case MOTIONSENSE_TYPE_PROX:
+			sensor_cells[id].name = "cros-ec-prox";
+			break;
+		case MOTIONSENSE_TYPE_LIGHT:
+			sensor_cells[id].name = "cros-ec-light";
+			break;
+		case MOTIONSENSE_TYPE_ACTIVITY:
+			sensor_cells[id].name = "cros-ec-activity";
+			break;
+		default:
+			dev_warn(ec_dev->dev, "unknown type %d\n",
+				 resp->info.type);
+			continue;
+		}
+		sensor_platforms[id].sensor_num = i;
+		sensor_platforms[id].cmd_offset = ec_p.cmd_offset;
+		sensor_cells[id].id = sensor_type[resp->info.type];
+		sensor_cells[id].platform_data = &sensor_platforms[id];
+		sensor_cells[id].pdata_size =
+			sizeof(struct cros_ec_sensor_platform);
+
+		sensor_type[resp->info.type]++;
+		id++;
+	}
+	if (sensor_type[MOTIONSENSE_TYPE_ACCEL] >= 2) {
+		sensor_platforms[id].sensor_num = sensor_num;
+
+		sensor_cells[id].name = "cros-ec-angle";
+		sensor_cells[id].id = 0;
+		sensor_cells[id].platform_data = &sensor_platforms[id];
+		sensor_cells[id].pdata_size =
+			sizeof(struct cros_ec_sensor_platform);
+		id++;
+	}
+
+	ret = mfd_add_devices(ec_dev->dev, PLATFORM_DEVID_AUTO, sensor_cells,
+			      id, NULL, 0, NULL);
+	if (ret)
+		dev_err(ec_dev->dev, "failed to add EC sensors\n");
+
+	kfree(sensor_platforms);
+error_platforms:
+	kfree(sensor_cells);
+error:
+	kfree(msg);
+}
+
 int cros_ec_register(struct cros_ec_device *ec_dev)
 {
 	struct device *dev = ec_dev->dev;
@@ -94,6 +248,8 @@ int cros_ec_register(struct cros_ec_device *ec_dev)
 	ec_dev->max_request = sizeof(struct ec_params_hello);
 	ec_dev->max_response = sizeof(struct ec_response_get_protocol_info);
 	ec_dev->max_passthru = 0;
+	ec_dev->features[0] = -1U; /* Not cached yet */
+	ec_dev->features[1] = -1U; /* Not cached yet */
 
 	ec_dev->din = devm_kzalloc(dev, ec_dev->din_size, GFP_KERNEL);
 	if (!ec_dev->din)
@@ -127,6 +283,10 @@ int cros_ec_register(struct cros_ec_device *ec_dev)
 		goto fail_mfd;
 	}
 
+	/* Check whether this EC is a sensor hub. */
+	if (cros_ec_check_features(ec_dev, EC_FEATURE_MOTION_SENSE))
+		cros_ec_sensors_register(ec_dev);
+
 	if (ec_dev->max_passthru) {
 		/*
 		 * Register a PD device as well on top of this device.
diff --git a/drivers/platform/chrome/cros_ec_dev.c b/drivers/platform/chrome/cros_ec_dev.c
index b9bf086..4947650 100644
--- a/drivers/platform/chrome/cros_ec_dev.c
+++ b/drivers/platform/chrome/cros_ec_dev.c
@@ -90,41 +90,6 @@ static int ec_get_version(struct cros_ec_dev *ec, char *str, int maxlen)
 	return ret;
 }
 
-static int cros_ec_check_features(struct cros_ec_dev *ec, int feature)
-{
-	struct cros_ec_command *msg;
-	int ret;
-
-	if (ec->features[0] == -1U && ec->features[1] == -1U) {
-		/* features bitmap not read yet */
-
-		msg = kmalloc(sizeof(*msg) + sizeof(ec->features), GFP_KERNEL);
-		if (!msg)
-			return -ENOMEM;
-
-		msg->version = 0;
-		msg->command = EC_CMD_GET_FEATURES + ec->cmd_offset;
-		msg->insize = sizeof(ec->features);
-		msg->outsize = 0;
-
-		ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
-		if (ret < 0 || msg->result != EC_RES_SUCCESS) {
-			dev_warn(ec->dev, "cannot get EC features: %d/%d\n",
-				 ret, msg->result);
-			memset(ec->features, 0, sizeof(ec->features));
-		}
-
-		memcpy(ec->features, msg->data, sizeof(ec->features));
-
-		dev_dbg(ec->dev, "EC features %08x %08x\n",
-			ec->features[0], ec->features[1]);
-
-		kfree(msg);
-	}
-
-	return ec->features[feature / 32] & EC_FEATURE_MASK_0(feature);
-}
-
 /* Device file ops */
 static int ec_device_open(struct inode *inode, struct file *filp)
 {
@@ -268,126 +233,6 @@ static void __remove(struct device *dev)
 	kfree(ec);
 }
 
-static void cros_ec_sensors_register(struct cros_ec_dev *ec)
-{
-	/*
-	 * Issue a command to get the number of sensor reported.
-	 * Build an array of sensors driver and register them all.
-	 */
-	int ret, i, id, sensor_num;
-	struct mfd_cell *sensor_cells;
-	struct cros_ec_sensor_platform *sensor_platforms;
-	int sensor_type[MOTIONSENSE_TYPE_MAX];
-	struct ec_params_motion_sense *params;
-	struct ec_response_motion_sense *resp;
-	struct cros_ec_command *msg;
-
-	msg = kzalloc(sizeof(struct cros_ec_command) +
-		      max(sizeof(*params), sizeof(*resp)), GFP_KERNEL);
-	if (msg == NULL)
-		return;
-
-	msg->version = 2;
-	msg->command = EC_CMD_MOTION_SENSE_CMD + ec->cmd_offset;
-	msg->outsize = sizeof(*params);
-	msg->insize = sizeof(*resp);
-
-	params = (struct ec_params_motion_sense *)msg->data;
-	params->cmd = MOTIONSENSE_CMD_DUMP;
-
-	ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
-	if (ret < 0 || msg->result != EC_RES_SUCCESS) {
-		dev_warn(ec->dev, "cannot get EC sensor information: %d/%d\n",
-			 ret, msg->result);
-		goto error;
-	}
-
-	resp = (struct ec_response_motion_sense *)msg->data;
-	sensor_num = resp->dump.sensor_count;
-	/* Allocate 2 extra sensors in case lid angle or FIFO are needed */
-	sensor_cells = kzalloc(sizeof(struct mfd_cell) * (sensor_num + 2),
-			       GFP_KERNEL);
-	if (sensor_cells == NULL)
-		goto error;
-
-	sensor_platforms = kzalloc(sizeof(struct cros_ec_sensor_platform) *
-		  (sensor_num + 1), GFP_KERNEL);
-	if (sensor_platforms == NULL)
-		goto error_platforms;
-
-	memset(sensor_type, 0, sizeof(sensor_type));
-	id = 0;
-	for (i = 0; i < sensor_num; i++) {
-		params->cmd = MOTIONSENSE_CMD_INFO;
-		params->info.sensor_num = i;
-		ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
-		if (ret < 0 || msg->result != EC_RES_SUCCESS) {
-			dev_warn(ec->dev, "no info for EC sensor %d : %d/%d\n",
-				 i, ret, msg->result);
-			continue;
-		}
-		switch (resp->info.type) {
-		case MOTIONSENSE_TYPE_ACCEL:
-			sensor_cells[id].name = "cros-ec-accel";
-			break;
-		case MOTIONSENSE_TYPE_BARO:
-			sensor_cells[id].name = "cros-ec-baro";
-			break;
-		case MOTIONSENSE_TYPE_GYRO:
-			sensor_cells[id].name = "cros-ec-gyro";
-			break;
-		case MOTIONSENSE_TYPE_MAG:
-			sensor_cells[id].name = "cros-ec-mag";
-			break;
-		case MOTIONSENSE_TYPE_PROX:
-			sensor_cells[id].name = "cros-ec-prox";
-			break;
-		case MOTIONSENSE_TYPE_LIGHT:
-			sensor_cells[id].name = "cros-ec-light";
-			break;
-		case MOTIONSENSE_TYPE_ACTIVITY:
-			sensor_cells[id].name = "cros-ec-activity";
-			break;
-		default:
-			dev_warn(ec->dev, "unknown type %d\n", resp->info.type);
-			continue;
-		}
-		sensor_platforms[id].sensor_num = i;
-		sensor_cells[id].id = sensor_type[resp->info.type];
-		sensor_cells[id].platform_data = &sensor_platforms[id];
-		sensor_cells[id].pdata_size =
-			sizeof(struct cros_ec_sensor_platform);
-
-		sensor_type[resp->info.type]++;
-		id++;
-	}
-	if (sensor_type[MOTIONSENSE_TYPE_ACCEL] >= 2) {
-		sensor_platforms[id].sensor_num = sensor_num;
-
-		sensor_cells[id].name = "cros-ec-angle";
-		sensor_cells[id].id = 0;
-		sensor_cells[id].platform_data = &sensor_platforms[id];
-		sensor_cells[id].pdata_size =
-			sizeof(struct cros_ec_sensor_platform);
-		id++;
-	}
-	if (cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE_FIFO)) {
-		sensor_cells[id].name = "cros-ec-ring";
-		id++;
-	}
-
-	ret = mfd_add_devices(ec->dev, 0, sensor_cells, id,
-			      NULL, 0, NULL);
-	if (ret)
-		dev_err(ec->dev, "failed to add EC sensors\n");
-
-	kfree(sensor_platforms);
-error_platforms:
-	kfree(sensor_cells);
-error:
-	kfree(msg);
-}
-
 static int ec_device_probe(struct platform_device *pdev)
 {
 	int retval = -ENOMEM;
@@ -402,8 +247,6 @@ static int ec_device_probe(struct platform_device *pdev)
 	ec->ec_dev = dev_get_drvdata(dev->parent);
 	ec->dev = dev;
 	ec->cmd_offset = ec_platform->cmd_offset;
-	ec->features[0] = -1U; /* Not cached yet */
-	ec->features[1] = -1U; /* Not cached yet */
 	device_initialize(&ec->class_dev);
 	cdev_init(&ec->cdev, &fops);
 
@@ -432,10 +275,6 @@ static int ec_device_probe(struct platform_device *pdev)
 	if (cros_ec_debugfs_init(ec))
 		dev_warn(dev, "failed to create debugfs directory\n");
 
-	/* check whether this EC is a sensor hub. */
-	if (cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE))
-		cros_ec_sensors_register(ec);
-
 	/* Take control of the lightbar from the EC. */
 	lb_manual_suspend_ctrl(ec, 1);
 
diff --git a/include/linux/mfd/cros_ec.h b/include/linux/mfd/cros_ec.h
index 3b16c90..8f87999 100644
--- a/include/linux/mfd/cros_ec.h
+++ b/include/linux/mfd/cros_ec.h
@@ -115,6 +115,7 @@ struct cros_ec_command {
  * @event_notifier: interrupt event notifier for transport devices.
  * @event_data: raw payload transferred with the MKBP event.
  * @event_size: size in bytes of the event data.
+ * @features: stores the EC features.
  */
 struct cros_ec_device {
 
@@ -149,15 +150,19 @@ struct cros_ec_device {
 
 	struct ec_response_get_next_event event_data;
 	int event_size;
+	u32 features[2];
 };
 
 /**
  * struct cros_ec_sensor_platform - ChromeOS EC sensor platform information
  *
  * @sensor_num: Id of the sensor, as reported by the EC.
+ * @cmd_offset: offset to apply for each command. Set when
+ * registering a devicde behind another one.
  */
 struct cros_ec_sensor_platform {
 	u8 sensor_num;
+	u16 cmd_offset;
 };
 
 /* struct cros_ec_platform - ChromeOS EC platform information
@@ -191,7 +196,6 @@ struct cros_ec_dev {
 	struct device *dev;
 	struct cros_ec_debugfs *debug_info;
 	u16 cmd_offset;
-	u32 features[2];
 };
 
 /**
-- 
2.9.3

[toc] | [prev] | [next] | [standalone]

#1615404 — [PATCH v2 3/5] mfd: cros_ec: Introduce RTC commands and events definitions.

From: Stephen Barber <smbarber@chromium.org>

The EC can function as a simple RT, this patch adds the RTC related
definitions needed by the rtc-cros-ec driver.

Signed-off-by: Stephen Barber <smbarber@chromium.org>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Acked-by: Lee Jones <lee.jones@linaro.org>
---
 include/linux/mfd/cros_ec_commands.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/include/linux/mfd/cros_ec_commands.h b/include/linux/mfd/cros_ec_commands.h
index 84e1abb..852ce34 100644
--- a/include/linux/mfd/cros_ec_commands.h
+++ b/include/linux/mfd/cros_ec_commands.h
@@ -286,6 +286,9 @@ enum host_event_code {
 	/* Hang detect logic detected a hang and warm rebooted the AP */
 	EC_HOST_EVENT_HANG_REBOOT = 21,
 
+	/* EC RTC event occurred */
+	EC_HOST_EVENT_RTC = 26,
+
 	/*
 	 * The high bit of the event mask is not used as a host event code.  If
 	 * it reads back as set, then the entire event mask should be
@@ -794,6 +797,8 @@ enum ec_feature_code {
 	EC_FEATURE_USB_MUX = 23,
 	/* Motion Sensor code has an internal software FIFO */
 	EC_FEATURE_MOTION_SENSE_FIFO = 24,
+	/* EC has RTC feature that can be controlled by host commands */
+	EC_FEATURE_RTC = 27,
 };
 
 #define EC_FEATURE_MASK_0(event_code) (1UL << (event_code % 32))
@@ -1704,6 +1709,9 @@ struct ec_response_rtc {
 #define EC_CMD_RTC_SET_VALUE 0x46
 #define EC_CMD_RTC_SET_ALARM 0x47
 
+/* Pass as param to SET_ALARM to clear the current alarm */
+#define EC_RTC_ALARM_CLEAR 0
+
 /*****************************************************************************/
 /* Port80 log access */
 
-- 
2.9.3

[toc] | [prev] | [next] | [standalone]

#1615405 — [PATCH v2 4/5] rtc: cros-ec: add cros-ec-rtc driver.

From: Stephen Barber <smbarber@chromium.org>

On platforms with a Chrome OS EC, the EC can function as a simple RTC.
Add a basic driver with this functionality.

Signed-off-by: Stephen Barber <smbarber@chromium.org>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Acked-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
---

Changes since v1:
 - None

 drivers/rtc/Kconfig       |  10 ++
 drivers/rtc/Makefile      |   1 +
 drivers/rtc/rtc-cros-ec.c | 412 ++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 423 insertions(+)
 create mode 100644 drivers/rtc/rtc-cros-ec.c

diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 050bec7..b2939b4 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -1204,6 +1204,16 @@ config RTC_DRV_ZYNQMP
 	  If you say yes here you get support for the RTC controller found on
 	  Xilinx Zynq Ultrascale+ MPSoC.
 
+config RTC_DRV_CROS_EC
+	tristate "Chrome OS EC RTC driver"
+	depends on MFD_CROS_EC
+	help
+	  If you say yes here you will get support for the
+	  Chrome OS Embedded Controller's RTC.
+
+	  This driver can also be built as a module. If so, the module
+	  will be called rtc-cros-ec.
+
 comment "on-CPU RTC drivers"
 
 config RTC_DRV_ASM9260
diff --git a/drivers/rtc/Makefile b/drivers/rtc/Makefile
index 13857d2..8162983 100644
--- a/drivers/rtc/Makefile
+++ b/drivers/rtc/Makefile
@@ -41,6 +41,7 @@ obj-$(CONFIG_RTC_DRV_BQ4802)	+= rtc-bq4802.o
 obj-$(CONFIG_RTC_DRV_CMOS)	+= rtc-cmos.o
 obj-$(CONFIG_RTC_DRV_COH901331)	+= rtc-coh901331.o
 obj-$(CONFIG_RTC_DRV_CPCAP)	+= rtc-cpcap.o
+obj-$(CONFIG_RTC_DRV_CROS_EC)	+= rtc-cros-ec.o
 obj-$(CONFIG_RTC_DRV_DA9052)	+= rtc-da9052.o
 obj-$(CONFIG_RTC_DRV_DA9055)	+= rtc-da9055.o
 obj-$(CONFIG_RTC_DRV_DA9063)	+= rtc-da9063.o
diff --git a/drivers/rtc/rtc-cros-ec.c b/drivers/rtc/rtc-cros-ec.c
new file mode 100644
index 0000000..a5c2512
--- /dev/null
+++ b/drivers/rtc/rtc-cros-ec.c
@@ -0,0 +1,412 @@
+/*
+ * RTC driver for Chrome OS Embedded Controller
+ *
+ * Copyright (c) 2017, Google, Inc
+ *
+ * Author: Stephen Barber <smbarber@chromium.org>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ */
+
+#include <linux/kernel.h>
+#include <linux/mfd/cros_ec.h>
+#include <linux/mfd/cros_ec_commands.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/rtc.h>
+#include <linux/slab.h>
+
+#define DRV_NAME	"cros-ec-rtc"
+
+/**
+ * struct cros_ec_rtc - Driver data for EC RTC
+ *
+ * @cros_ec: Pointer to EC device
+ * @rtc: Pointer to RTC device
+ * @notifier: Notifier info for responding to EC events
+ * @saved_alarm: Alarm to restore when interrupts are reenabled
+ */
+struct cros_ec_rtc {
+	struct cros_ec_device *cros_ec;
+	struct rtc_device *rtc;
+	struct notifier_block notifier;
+	u32 saved_alarm;
+};
+
+static int cros_ec_rtc_get(struct cros_ec_device *cros_ec, u32 command,
+			   u32 *response)
+{
+	int ret;
+	struct {
+		struct cros_ec_command msg;
+		struct ec_response_rtc data;
+	} __packed msg;
+
+	memset(&msg, 0, sizeof(msg));
+	msg.msg.command = command;
+	msg.msg.insize = sizeof(msg.data);
+
+	ret = cros_ec_cmd_xfer_status(cros_ec, &msg.msg);
+	if (ret < 0) {
+		dev_err(cros_ec->dev,
+			"error getting %s from EC: %d\n",
+			command == EC_CMD_RTC_GET_VALUE ? "time" : "alarm",
+			ret);
+		return ret;
+	}
+
+	*response = msg.data.time;
+
+	return 0;
+}
+
+static int cros_ec_rtc_set(struct cros_ec_device *cros_ec, u32 command,
+			   u32 param)
+{
+	int ret = 0;
+	struct {
+		struct cros_ec_command msg;
+		struct ec_response_rtc data;
+	} __packed msg;
+
+	memset(&msg, 0, sizeof(msg));
+	msg.msg.command = command;
+	msg.msg.outsize = sizeof(msg.data);
+	msg.data.time = param;
+
+	ret = cros_ec_cmd_xfer_status(cros_ec, &msg.msg);
+	if (ret < 0) {
+		dev_err(cros_ec->dev, "error setting %s on EC: %d\n",
+			command == EC_CMD_RTC_SET_VALUE ? "time" : "alarm",
+			ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+/* Read the current time from the EC. */
+static int cros_ec_rtc_read_time(struct device *dev, struct rtc_time *tm)
+{
+	struct cros_ec_rtc *cros_ec_rtc = dev_get_drvdata(dev);
+	struct cros_ec_device *cros_ec = cros_ec_rtc->cros_ec;
+	int ret;
+	u32 time;
+
+	ret = cros_ec_rtc_get(cros_ec, EC_CMD_RTC_GET_VALUE, &time);
+	if (ret) {
+		dev_err(dev, "error getting time: %d\n", ret);
+		return ret;
+	}
+
+	rtc_time64_to_tm(time, tm);
+
+	return 0;
+}
+
+/* Set the current EC time. */
+static int cros_ec_rtc_set_time(struct device *dev, struct rtc_time *tm)
+{
+	struct cros_ec_rtc *cros_ec_rtc = dev_get_drvdata(dev);
+	struct cros_ec_device *cros_ec = cros_ec_rtc->cros_ec;
+	int ret;
+	time64_t time;
+
+	time = rtc_tm_to_time64(tm);
+	if (time < 0 || time > U32_MAX)
+		return -EINVAL;
+
+	ret = cros_ec_rtc_set(cros_ec, EC_CMD_RTC_SET_VALUE, (u32)time);
+	if (ret < 0) {
+		dev_err(dev, "error setting time: %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+/* Read alarm time from RTC. */
+static int cros_ec_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+	struct cros_ec_rtc *cros_ec_rtc = dev_get_drvdata(dev);
+	struct cros_ec_device *cros_ec = cros_ec_rtc->cros_ec;
+	int ret;
+	u32 current_time, alarm_offset;
+
+	/*
+	 * The EC host command for getting the alarm is relative (i.e. 5
+	 * seconds from now) whereas rtc_wkalrm is absolute. Get the current
+	 * RTC time first so we can calculate the relative time.
+	 */
+	ret = cros_ec_rtc_get(cros_ec, EC_CMD_RTC_GET_VALUE, &current_time);
+	if (ret < 0) {
+		dev_err(dev, "error getting time: %d\n", ret);
+		return ret;
+	}
+
+	ret = cros_ec_rtc_get(cros_ec, EC_CMD_RTC_GET_ALARM, &alarm_offset);
+	if (ret < 0) {
+		dev_err(dev, "error getting alarm: %d\n", ret);
+		return ret;
+	}
+
+	rtc_time64_to_tm(current_time + alarm_offset, &alrm->time);
+
+	return 0;
+}
+
+/* Set the EC's RTC alarm. */
+static int cros_ec_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
+{
+	struct cros_ec_rtc *cros_ec_rtc = dev_get_drvdata(dev);
+	struct cros_ec_device *cros_ec = cros_ec_rtc->cros_ec;
+	int ret;
+	time64_t alarm_time;
+	u32 current_time, alarm_offset;
+
+	/*
+	 * The EC host command for setting the alarm is relative
+	 * (i.e. 5 seconds from now) whereas rtc_wkalrm is absolute.
+	 * Get the current RTC time first so we can calculate the
+	 * relative time.
+	 */
+	ret = cros_ec_rtc_get(cros_ec, EC_CMD_RTC_GET_VALUE, &current_time);
+	if (ret < 0) {
+		dev_err(dev, "error getting time: %d\n", ret);
+		return ret;
+	}
+
+	alarm_time = rtc_tm_to_time64(&alrm->time);
+
+	if (alarm_time < 0 || alarm_time > U32_MAX)
+		return -EINVAL;
+
+	if (!alrm->enabled) {
+		/*
+		 * If the alarm is being disabled, send an alarm
+		 * clear command.
+		 */
+		alarm_offset = EC_RTC_ALARM_CLEAR;
+		cros_ec_rtc->saved_alarm = (u32)alarm_time;
+	} else {
+		/* Don't set an alarm in the past. */
+		if ((u32)alarm_time < current_time)
+			alarm_offset = EC_RTC_ALARM_CLEAR;
+		else
+			alarm_offset = (u32)alarm_time - current_time;
+	}
+
+	ret = cros_ec_rtc_set(cros_ec, EC_CMD_RTC_SET_ALARM, alarm_offset);
+	if (ret < 0) {
+		dev_err(dev, "error setting alarm: %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int cros_ec_rtc_alarm_irq_enable(struct device *dev,
+					unsigned int enabled)
+{
+	struct cros_ec_rtc *cros_ec_rtc = dev_get_drvdata(dev);
+	struct cros_ec_device *cros_ec = cros_ec_rtc->cros_ec;
+	int ret;
+	u32 current_time, alarm_offset, alarm_value;
+
+	ret = cros_ec_rtc_get(cros_ec, EC_CMD_RTC_GET_VALUE, &current_time);
+	if (ret < 0) {
+		dev_err(dev, "error getting time: %d\n", ret);
+		return ret;
+	}
+
+	if (enabled) {
+		/* Restore saved alarm if it's still in the future. */
+		if (cros_ec_rtc->saved_alarm < current_time)
+			alarm_offset = EC_RTC_ALARM_CLEAR;
+		else
+			alarm_offset = cros_ec_rtc->saved_alarm - current_time;
+
+		ret = cros_ec_rtc_set(cros_ec, EC_CMD_RTC_SET_ALARM,
+				      alarm_offset);
+		if (ret < 0) {
+			dev_err(dev, "error restoring alarm: %d\n", ret);
+			return ret;
+		}
+	} else {
+		/* Disable alarm, saving the old alarm value. */
+		ret = cros_ec_rtc_get(cros_ec, EC_CMD_RTC_GET_ALARM,
+				      &alarm_offset);
+		if (ret < 0) {
+			dev_err(dev, "error saving alarm: %d\n", ret);
+			return ret;
+		}
+
+		alarm_value = current_time + alarm_offset;
+
+		/*
+		 * If the current EC alarm is already past, we don't want
+		 * to set an alarm when we go through the alarm irq enable
+		 * path.
+		 */
+		if (alarm_value < current_time)
+			cros_ec_rtc->saved_alarm = EC_RTC_ALARM_CLEAR;
+		else
+			cros_ec_rtc->saved_alarm = alarm_value;
+
+		alarm_offset = EC_RTC_ALARM_CLEAR;
+		ret = cros_ec_rtc_set(cros_ec, EC_CMD_RTC_SET_ALARM,
+				      alarm_offset);
+		if (ret < 0) {
+			dev_err(dev, "error disabling alarm: %d\n", ret);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+static int cros_ec_rtc_event(struct notifier_block *nb,
+			     unsigned long queued_during_suspend,
+			     void *_notify)
+{
+	struct cros_ec_rtc *cros_ec_rtc;
+	struct rtc_device *rtc;
+	struct cros_ec_device *cros_ec;
+	u32 host_event;
+
+	cros_ec_rtc = container_of(nb, struct cros_ec_rtc, notifier);
+	rtc = cros_ec_rtc->rtc;
+	cros_ec = cros_ec_rtc->cros_ec;
+
+	host_event = cros_ec_get_host_event(cros_ec);
+	if (host_event & EC_HOST_EVENT_MASK(EC_HOST_EVENT_RTC)) {
+		rtc_update_irq(rtc, 1, RTC_IRQF | RTC_AF);
+		return NOTIFY_OK;
+	} else {
+		return NOTIFY_DONE;
+	}
+}
+
+static const struct rtc_class_ops cros_ec_rtc_ops = {
+	.read_time = cros_ec_rtc_read_time,
+	.set_time = cros_ec_rtc_set_time,
+	.read_alarm = cros_ec_rtc_read_alarm,
+	.set_alarm = cros_ec_rtc_set_alarm,
+	.alarm_irq_enable = cros_ec_rtc_alarm_irq_enable,
+};
+
+#ifdef CONFIG_PM_SLEEP
+static int cros_ec_rtc_suspend(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct cros_ec_rtc *cros_ec_rtc = dev_get_drvdata(&pdev->dev);
+
+	if (device_may_wakeup(dev))
+		enable_irq_wake(cros_ec_rtc->cros_ec->irq);
+
+	return 0;
+}
+
+static int cros_ec_rtc_resume(struct device *dev)
+{
+	struct platform_device *pdev = to_platform_device(dev);
+	struct cros_ec_rtc *cros_ec_rtc = dev_get_drvdata(&pdev->dev);
+
+	if (device_may_wakeup(dev))
+		disable_irq_wake(cros_ec_rtc->cros_ec->irq);
+
+	return 0;
+}
+#endif
+
+static SIMPLE_DEV_PM_OPS(cros_ec_rtc_pm_ops, cros_ec_rtc_suspend,
+			 cros_ec_rtc_resume);
+
+static int cros_ec_rtc_probe(struct platform_device *pdev)
+{
+	struct cros_ec_device *cros_ec_dev = dev_get_drvdata(pdev->dev.parent);
+	struct cros_ec_rtc *cros_ec_rtc;
+	struct rtc_time tm;
+	int ret;
+
+	cros_ec_rtc = devm_kzalloc(&pdev->dev, sizeof(*cros_ec_rtc),
+				   GFP_KERNEL);
+	if (!cros_ec_rtc)
+		return -ENOMEM;
+
+	platform_set_drvdata(pdev, cros_ec_rtc);
+	cros_ec_rtc->cros_ec = cros_ec_dev;
+
+	/* Get initial time */
+	ret = cros_ec_rtc_read_time(&pdev->dev, &tm);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to read RTC time\n");
+		return ret;
+	}
+
+	ret = device_init_wakeup(&pdev->dev, 1);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to initialize wakeup\n");
+		return ret;
+	}
+
+	cros_ec_rtc->rtc = devm_rtc_device_register(&pdev->dev, DRV_NAME,
+						    &cros_ec_rtc_ops,
+						    THIS_MODULE);
+	if (IS_ERR(cros_ec_rtc->rtc)) {
+		ret = PTR_ERR(cros_ec_rtc->rtc);
+		dev_err(&pdev->dev, "failed to register rtc device\n");
+		return ret;
+	}
+
+	/* Get RTC events from the EC. */
+	cros_ec_rtc->notifier.notifier_call = cros_ec_rtc_event;
+	ret = blocking_notifier_chain_register(&cros_ec_dev->event_notifier,
+					       &cros_ec_rtc->notifier);
+	if (ret) {
+		dev_err(&pdev->dev, "failed to register notifier\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static int cros_ec_rtc_remove(struct platform_device *pdev)
+{
+	struct cros_ec_rtc *cros_ec_rtc = platform_get_drvdata(pdev);
+	struct device *dev = &pdev->dev;
+	int ret;
+
+	ret = blocking_notifier_chain_unregister(
+				&cros_ec_rtc->cros_ec->event_notifier,
+				&cros_ec_rtc->notifier);
+	if (ret) {
+		dev_err(dev, "failed to unregister notifier\n");
+		return ret;
+	}
+
+	return 0;
+}
+
+static struct platform_driver cros_ec_rtc_driver = {
+	.probe = cros_ec_rtc_probe,
+	.remove = cros_ec_rtc_remove,
+	.driver = {
+		.name = DRV_NAME,
+		.pm = &cros_ec_rtc_pm_ops,
+	},
+};
+
+module_platform_driver(cros_ec_rtc_driver);
+
+MODULE_DESCRIPTION("RTC driver for Chrome OS ECs");
+MODULE_AUTHOR("Stephen Barber <smbarber@chromium.org>");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" DRV_NAME);
-- 
2.9.3

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