Merge tag 'staging-5.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging

Pull staging and IIO driver updates from Greg KH:
 "Here is the big staging/iio driver update for 5.4-rc1.

  Lots of churn here, with a few driver/filesystems moving out of
  staging finally:

     - erofs moved out of staging

     - greybus core code moved out of staging

  Along with that, a new filesytem has been added:

     - extfat

  to provide support for those devices requiring that filesystem (i.e.
  transfer devices to/from windows systems or printers)

  Other than that, there a number of new IIO drivers, and lots and lots
  and lots of staging driver cleanups and minor fixes as people continue
  to dig into those for easy changes.

  All of these have been in linux-next for a while with no reported
  issues"

* tag 'staging-5.4-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging: (453 commits)
  Staging: gasket: Use temporaries to reduce line length.
  Staging: octeon: Avoid several usecases of strcpy
  staging: vhciq_core: replace snprintf with scnprintf
  staging: wilc1000: avoid twice IRQ handler execution for each single interrupt
  staging: wilc1000: remove unused interrupt status handling code
  staging: fbtft: make several arrays static const, makes object smaller
  staging: rtl8188eu: make two arrays static const, makes object smaller
  staging: rtl8723bs: core: Remove Macro "IS_MAC_ADDRESS_BROADCAST"
  dt-bindings: anybus-controller: move to staging/ tree
  staging: emxx_udc: remove local TRUE/FALSE definition
  staging: wilc1000: look for rtc_clk clock
  staging: dt-bindings: wilc1000: add optional rtc_clk property
  staging: nvec: make use of devm_platform_ioremap_resource
  staging: exfat: drop unused function parameter
  Staging: exfat: Avoid use of strcpy
  staging: exfat: use integer constants
  staging: exfat: cleanup spacing for casts
  staging: exfat: cleanup spacing for operators
  staging: rtl8723bs: hal: remove redundant variable n
  staging: pi433: Fix typo in documentation
  ...

96 files changed, 3214 insertions, 1477 deletions

diff --git a/drivers/iio/accel/Kconfig b/drivers/iio/accel/Kconfig
index 9b9656ce37e6..d4ef35aeb579 100644
--- a/drivers/iio/accel/Kconfig
+++ b/drivers/iio/accel/Kconfig
@@ -202,9 +202,7 @@ config HID_SENSOR_ACCEL_3D
 
 config IIO_CROS_EC_ACCEL_LEGACY
 	tristate "ChromeOS EC Legacy Accelerometer Sensor"
-	select IIO_BUFFER
-	select IIO_TRIGGERED_BUFFER
-	select CROS_EC_LPC_REGISTER_DEVICE
+	depends on IIO_CROS_EC_SENSORS_CORE
 	help
 	  Say yes here to get support for accelerometers on Chromebook using
 	  legacy EC firmware.
diff --git a/drivers/iio/accel/cros_ec_accel_legacy.c b/drivers/iio/accel/cros_ec_accel_legacy.c
index ad19d9c716f4..39002cb5605d 100644
--- a/drivers/iio/accel/cros_ec_accel_legacy.c
+++ b/drivers/iio/accel/cros_ec_accel_legacy.c
@@ -5,13 +5,14 @@
  * 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.
  */
 
 #include <linux/delay.h>
 #include <linux/device.h>
 #include <linux/iio/buffer.h>
+#include <linux/iio/common/cros_ec_sensors_core.h>
 #include <linux/iio/iio.h>
 #include <linux/iio/kfifo_buf.h>
 #include <linux/iio/trigger_consumer.h>
@@ -25,160 +26,41 @@
 
 #define DRV_NAME	"cros-ec-accel-legacy"
 
+#define CROS_EC_SENSOR_LEGACY_NUM 2
 /*
  * Sensor scale hard coded at 10 bits per g, computed as:
  * g / (2^10 - 1) = 0.009586168; with g = 9.80665 m.s^-2
  */
 #define ACCEL_LEGACY_NSCALE 9586168
 
-/* Indices for EC sensor values. */
-enum {
-	X,
-	Y,
-	Z,
-	MAX_AXIS,
-};
-
-/* State data for cros_ec_accel_legacy iio driver. */
-struct cros_ec_accel_legacy_state {
-	struct cros_ec_device *ec;
-
-	/*
-	 * Array holding data from a single capture. 2 bytes per channel
-	 * for the 3 channels plus the timestamp which is always last and
-	 * 8-bytes aligned.
-	 */
-	s16 capture_data[8];
-	s8 sign[MAX_AXIS];
-	u8 sensor_num;
-};
-
-static int ec_cmd_read_u8(struct cros_ec_device *ec, unsigned int offset,
-			  u8 *dest)
-{
-	return ec->cmd_readmem(ec, offset, 1, dest);
-}
-
-static int ec_cmd_read_u16(struct cros_ec_device *ec, unsigned int offset,
-			   u16 *dest)
-{
-	__le16 tmp;
-	int ret = ec->cmd_readmem(ec, offset, 2, &tmp);
-
-	*dest = le16_to_cpu(tmp);
-
-	return ret;
-}
-
-/**
- * read_ec_until_not_busy() - Read from EC status byte until it reads not busy.
- * @st: Pointer to state information for device.
- *
- * This function reads EC status until its busy bit gets cleared. It does not
- * wait indefinitely and returns -EIO if the EC status is still busy after a
- * few hundreds milliseconds.
- *
- * Return: 8-bit status if ok, -EIO on error
- */
-static int read_ec_until_not_busy(struct cros_ec_accel_legacy_state *st)
-{
-	struct cros_ec_device *ec = st->ec;
-	u8 status;
-	int attempts = 0;
-
-	ec_cmd_read_u8(ec, EC_MEMMAP_ACC_STATUS, &status);
-	while (status & EC_MEMMAP_ACC_STATUS_BUSY_BIT) {
-		/* Give up after enough attempts, return error. */
-		if (attempts++ >= 50)
-			return -EIO;
-
-		/* Small delay every so often. */
-		if (attempts % 5 == 0)
-			msleep(25);
-
-		ec_cmd_read_u8(ec, EC_MEMMAP_ACC_STATUS, &status);
-	}
-
-	return status;
-}
-
-/**
- * read_ec_accel_data_unsafe() - Read acceleration data from EC shared memory.
- * @st:        Pointer to state information for device.
- * @scan_mask: Bitmap of the sensor indices to scan.
- * @data:      Location to store data.
- *
- * This is the unsafe function for reading the EC data. It does not guarantee
- * that the EC will not modify the data as it is being read in.
- */
-static void read_ec_accel_data_unsafe(struct cros_ec_accel_legacy_state *st,
-				      unsigned long scan_mask, s16 *data)
-{
-	int i = 0;
-	int num_enabled = bitmap_weight(&scan_mask, MAX_AXIS);
-
-	/* Read all sensors enabled in scan_mask. Each value is 2 bytes. */
-	while (num_enabled--) {
-		i = find_next_bit(&scan_mask, MAX_AXIS, i);
-		ec_cmd_read_u16(st->ec,
-				EC_MEMMAP_ACC_DATA +
-				sizeof(s16) *
-				(1 + i + st->sensor_num * MAX_AXIS),
-				data);
-		*data *= st->sign[i];
-		i++;
-		data++;
-	}
-}
-
-/**
- * read_ec_accel_data() - Read acceleration data from EC shared memory.
- * @st:        Pointer to state information for device.
- * @scan_mask: Bitmap of the sensor indices to scan.
- * @data:      Location to store data.
- *
- * This is the safe function for reading the EC data. It guarantees that
- * the data sampled was not modified by the EC while being read.
- *
- * Return: 0 if ok, -ve on error
- */
-static int read_ec_accel_data(struct cros_ec_accel_legacy_state *st,
-			      unsigned long scan_mask, s16 *data)
+static int cros_ec_accel_legacy_read_cmd(struct iio_dev *indio_dev,
+				  unsigned long scan_mask, s16 *data)
 {
-	u8 samp_id = 0xff;
-	u8 status = 0;
+	struct cros_ec_sensors_core_state *st = iio_priv(indio_dev);
 	int ret;
-	int attempts = 0;
+	unsigned int i;
+	u8 sensor_num;
 
 	/*
-	 * Continually read all data from EC until the status byte after
-	 * all reads reflects that the EC is not busy and the sample id
-	 * matches the sample id from before all reads. This guarantees
-	 * that data read in was not modified by the EC while reading.
+	 * Read all sensor data through a command.
+	 * Save sensor_num, it is assumed to stay.
 	 */
-	while ((status & (EC_MEMMAP_ACC_STATUS_BUSY_BIT |
-			  EC_MEMMAP_ACC_STATUS_SAMPLE_ID_MASK)) != samp_id) {
-		/* If we have tried to read too many times, return error. */
-		if (attempts++ >= 5)
-			return -EIO;
-
-		/* Read status byte until EC is not busy. */
-		ret = read_ec_until_not_busy(st);
-		if (ret < 0)
-			return ret;
-		status = ret;
-
-		/*
-		 * Store the current sample id so that we can compare to the
-		 * sample id after reading the data.
-		 */
-		samp_id = status & EC_MEMMAP_ACC_STATUS_SAMPLE_ID_MASK;
-
-		/* Read all EC data, format it, and store it into data. */
-		read_ec_accel_data_unsafe(st, scan_mask, data);
+	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;
+	}
 
-		/* Read status byte. */
-		ec_cmd_read_u8(st->ec, EC_MEMMAP_ACC_STATUS, &status);
+	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;
@@ -188,28 +70,40 @@ static int cros_ec_accel_legacy_read(struct iio_dev *indio_dev,
 				     struct iio_chan_spec const *chan,
 				     int *val, int *val2, long mask)
 {
-	struct cros_ec_accel_legacy_state *st = iio_priv(indio_dev);
+	struct cros_ec_sensors_core_state *st = iio_priv(indio_dev);
 	s16 data = 0;
-	int ret = IIO_VAL_INT;
+	int ret;
+	int idx = chan->scan_index;
+
+	mutex_lock(&st->cmd_lock);
 
 	switch (mask) {
 	case IIO_CHAN_INFO_RAW:
-		ret = read_ec_accel_data(st, (1 << chan->scan_index), &data);
-		if (ret)
-			return ret;
+		ret = st->read_ec_sensors_data(indio_dev, 1 << idx, &data);
+		if (ret < 0)
+			break;
+		ret = IIO_VAL_INT;
 		*val = data;
-		return IIO_VAL_INT;
+		break;
 	case IIO_CHAN_INFO_SCALE:
+		WARN_ON(st->type != MOTIONSENSE_TYPE_ACCEL);
 		*val = 0;
 		*val2 = ACCEL_LEGACY_NSCALE;
-		return IIO_VAL_INT_PLUS_NANO;
+		ret = IIO_VAL_INT_PLUS_NANO;
+		break;
 	case IIO_CHAN_INFO_CALIBBIAS:
 		/* Calibration not supported. */
 		*val = 0;
-		return IIO_VAL_INT;
+		ret = IIO_VAL_INT;