mfd: Add driver for RAVE Supervisory Processor (538ee272) · Commits · 戴 / test

drivers/mfd/Kconfig

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Original line number	Diff line number	Diff line
		@@ -1859,5 +1859,13 @@ config MFD_VEXPRESS_SYSREG
		System Registers are the platform configuration block
		on the ARM Ltd. Versatile Express board.

		config RAVE_SP_CORE
		tristate "RAVE SP MCU core driver"
		depends on SERIAL_DEV_BUS
		select CRC_CCITT
		help
		Select this to get support for the Supervisory Processor
		device found on several devices in RAVE line of hardware.

		endmenu
		endif

drivers/mfd/Makefile

+2 −0

Original line number	Diff line number	Diff line
		@@ -230,3 +230,5 @@ obj-$(CONFIG_MFD_STM32_LPTIMER) += stm32-lptimer.o
		obj-$(CONFIG_MFD_STM32_TIMERS) += stm32-timers.o
		obj-$(CONFIG_MFD_MXS_LRADC) += mxs-lradc.o
		obj-$(CONFIG_MFD_SC27XX_PMIC) += sprd-sc27xx-spi.o
		obj-$(CONFIG_RAVE_SP_CORE) += rave-sp.o

drivers/mfd/rave-sp.c

0 → 100644

+710 −0

Original line number	Diff line number	Diff line
		// SPDX-License-Identifier: GPL-2.0+

		/*
		* Multifunction core driver for Zodiac Inflight Innovations RAVE
		* Supervisory Processor(SP) MCU that is connected via dedicated UART
		* port
		*
		* Copyright (C) 2017 Zodiac Inflight Innovations
		*/

		#include <linux/atomic.h>
		#include <linux/crc-ccitt.h>
		#include <linux/delay.h>
		#include <linux/export.h>
		#include <linux/init.h>
		#include <linux/slab.h>
		#include <linux/kernel.h>
		#include <linux/mfd/rave-sp.h>
		#include <linux/module.h>
		#include <linux/of.h>
		#include <linux/of_device.h>
		#include <linux/sched.h>
		#include <linux/serdev.h>
		#include <asm/unaligned.h>

		/*
		* UART protocol using following entities:
		* - message to MCU => ACK response
		* - event from MCU => event ACK
		*
		* Frame structure:
		* <STX> <DATA> <CHECKSUM> <ETX>
		* Where:
		* - STX - is start of transmission character
		* - ETX - end of transmission
		* - DATA - payload
		* - CHECKSUM - checksum calculated on <DATA>
		*
		* If <DATA> or <CHECKSUM> contain one of control characters, then it is
		* escaped using <DLE> control code. Added <DLE> does not participate in
		* checksum calculation.
		*/
		#define RAVE_SP_STX 0x02
		#define RAVE_SP_ETX 0x03
		#define RAVE_SP_DLE 0x10

		#define RAVE_SP_MAX_DATA_SIZE 64
		#define RAVE_SP_CHECKSUM_SIZE 2 /* Worst case scenario on RDU2 */
		/*
		* We don't store STX, ETX and unescaped bytes, so Rx is only
		* DATA + CSUM
		*/
		#define RAVE_SP_RX_BUFFER_SIZE \
		(RAVE_SP_MAX_DATA_SIZE + RAVE_SP_CHECKSUM_SIZE)

		#define RAVE_SP_STX_ETX_SIZE 2
		/*
		* For Tx we have to have space for everything, STX, EXT and
		* potentially stuffed DATA + CSUM data + csum
		*/
		#define RAVE_SP_TX_BUFFER_SIZE \
		(RAVE_SP_STX_ETX_SIZE + 2 * RAVE_SP_RX_BUFFER_SIZE)

		#define RAVE_SP_BOOT_SOURCE_GET 0
		#define RAVE_SP_BOOT_SOURCE_SET 1

		#define RAVE_SP_RDU2_BOARD_TYPE_RMB 0
		#define RAVE_SP_RDU2_BOARD_TYPE_DEB 1

		#define RAVE_SP_BOOT_SOURCE_SD 0
		#define RAVE_SP_BOOT_SOURCE_EMMC 1
		#define RAVE_SP_BOOT_SOURCE_NOR 2

		/**
		* enum rave_sp_deframer_state - Possible state for de-framer
		*
		* @RAVE_SP_EXPECT_SOF: Scanning input for start-of-frame marker
		* @RAVE_SP_EXPECT_DATA: Got start of frame marker, collecting frame
		* @RAVE_SP_EXPECT_ESCAPED_DATA: Got escape character, collecting escaped byte
		*/
		enum rave_sp_deframer_state {
		RAVE_SP_EXPECT_SOF,
		RAVE_SP_EXPECT_DATA,
		RAVE_SP_EXPECT_ESCAPED_DATA,
		};

		/**
		* struct rave_sp_deframer - Device protocol deframer
		*
		* @state: Current state of the deframer
		* @data: Buffer used to collect deframed data
		* @length: Number of bytes de-framed so far
		*/
		struct rave_sp_deframer {
		enum rave_sp_deframer_state state;
		unsigned char data[RAVE_SP_RX_BUFFER_SIZE];
		size_t length;
		};

		/**
		* struct rave_sp_reply - Reply as per RAVE device protocol
		*
		* @length: Expected reply length
		* @data: Buffer to store reply payload in
		* @code: Expected reply code
		* @ackid: Expected reply ACK ID
		* @completion: Successful reply reception completion
		*/
		struct rave_sp_reply {
		size_t length;
		void *data;
		u8 code;
		u8 ackid;
		struct completion received;
		};

		/**
		* struct rave_sp_checksum - Variant specific checksum implementation details
		*
		* @length: Caculated checksum length
		* @subroutine: Utilized checksum algorithm implementation
		*/
		struct rave_sp_checksum {
		size_t length;
		void (subroutine)(const u8 , size_t, u8 *);
		};

		/**
		* struct rave_sp_variant_cmds - Variant specific command routines
		*
		* @translate: Generic to variant specific command mapping routine
		*
		*/
		struct rave_sp_variant_cmds {
		int (*translate)(enum rave_sp_command);
		};

		/**
		* struct rave_sp_variant - RAVE supervisory processor core variant
		*
		* @checksum: Variant specific checksum implementation
		* @cmd: Variant specific command pointer table
		*
		*/
		struct rave_sp_variant {
		const struct rave_sp_checksum *checksum;
		struct rave_sp_variant_cmds cmd;
		};

		/**
		* struct rave_sp - RAVE supervisory processor core
		*
		* @serdev: Pointer to underlying serdev
		* @deframer: Stored state of the protocol deframer
		* @ackid: ACK ID used in last reply sent to the device
		* @bus_lock: Lock to serialize access to the device
		* @reply_lock: Lock protecting @reply
		* @reply: Pointer to memory to store reply payload
		*
		* @variant: Device variant specific information
		* @event_notifier_list: Input event notification chain
		*
		*/
		struct rave_sp {
		struct serdev_device *serdev;
		struct rave_sp_deframer deframer;
		atomic_t ackid;
		struct mutex bus_lock;
		struct mutex reply_lock;
		struct rave_sp_reply *reply;

		const struct rave_sp_variant *variant;
		struct blocking_notifier_head event_notifier_list;
		};

		static bool rave_sp_id_is_event(u8 code)
		{
		return (code & 0xF0) == RAVE_SP_EVNT_BASE;
		}

		static void rave_sp_unregister_event_notifier(struct device dev, void res)
		{
		struct rave_sp *sp = dev_get_drvdata(dev->parent);
		struct notifier_block nb = (struct notifier_block **)res;
		struct blocking_notifier_head *bnh = &sp->event_notifier_list;

		WARN_ON(blocking_notifier_chain_unregister(bnh, nb));
		}

		int devm_rave_sp_register_event_notifier(struct device *dev,
		struct notifier_block *nb)
		{
		struct rave_sp *sp = dev_get_drvdata(dev->parent);
		struct notifier_block **rcnb;
		int ret;

		rcnb = devres_alloc(rave_sp_unregister_event_notifier,
		sizeof(*rcnb), GFP_KERNEL);
		if (!rcnb)
		return -ENOMEM;

		ret = blocking_notifier_chain_register(&sp->event_notifier_list, nb);
		if (!ret) {
		*rcnb = nb;
		devres_add(dev, rcnb);
		} else {
		devres_free(rcnb);
		}

		return ret;
		}
		EXPORT_SYMBOL_GPL(devm_rave_sp_register_event_notifier);

		static void csum_8b2c(const u8 buf, size_t size, u8 crc)
		{
		crc = buf++;
		size--;

		while (size--)
		crc += buf++;

		crc = 1 + ~(crc);
		}

		static void csum_ccitt(const u8 buf, size_t size, u8 crc)
		{
		const u16 calculated = crc_ccitt_false(0xffff, buf, size);

		/*
		* While the rest of the wire protocol is little-endian,
		* CCITT-16 CRC in RDU2 device is sent out in big-endian order.
		*/
		put_unaligned_be16(calculated, crc);
		}

		static void stuff(unsigned char dest, const unsigned char *src, size_t n)
		{
		while (n--) {
		const unsigned char byte = *src++;

		switch (byte) {
		case RAVE_SP_STX:
		case RAVE_SP_ETX:
		case RAVE_SP_DLE:
		*dest++ = RAVE_SP_DLE;
		/* FALLTHROUGH */
		default:
		*dest++ = byte;
		}
		}

		return dest;
		}

		static int rave_sp_write(struct rave_sp sp, const u8 data, u8 data_size)
		{
		const size_t checksum_length = sp->variant->checksum->length;
		unsigned char frame[RAVE_SP_TX_BUFFER_SIZE];
		unsigned char crc[RAVE_SP_CHECKSUM_SIZE];
		unsigned char *dest = frame;
		size_t length;

		if (WARN_ON(checksum_length > sizeof(crc)))
		return -ENOMEM;

		if (WARN_ON(data_size > sizeof(frame)))
		return -ENOMEM;

		sp->variant->checksum->subroutine(data, data_size, crc);

		*dest++ = RAVE_SP_STX;
		dest = stuff(dest, data, data_size);
		dest = stuff(dest, crc, checksum_length);
		*dest++ = RAVE_SP_ETX;

		length = dest - frame;

		print_hex_dump(KERN_DEBUG, "rave-sp tx: ", DUMP_PREFIX_NONE,
		16, 1, frame, length, false);

		return serdev_device_write(sp->serdev, frame, length, HZ);
		}

		static u8 rave_sp_reply_code(u8 command)
		{
		/*
		* There isn't a single rule that describes command code ->
		* ACK code transformation, but, going through various
		* versions of ICDs, there appear to be three distinct groups
		* that can be described by simple transformation.
		*/
		switch (command) {
		case 0xA0 ... 0xBE:
		/*
		* Commands implemented by firmware found in RDU1 and
		* older devices all seem to obey the following rule
		*/
		return command + 0x20;
		case 0xE0 ... 0xEF:
		/*
		* Events emitted by all versions of the firmare use
		* least significant bit to get an ACK code
		*/
		return command \| 0x01;
		default:
		/*
		* Commands implemented by firmware found in RDU2 are
		* similar to "old" commands, but they use slightly
		* different offset
		*/
		return command + 0x40;
		}
		}

		int rave_sp_exec(struct rave_sp *sp,
		void *__data, size_t data_size,
		void *reply_data, size_t reply_data_size)
		{
		struct rave_sp_reply reply = {
		.data = reply_data,
		.length = reply_data_size,
		.received = COMPLETION_INITIALIZER_ONSTACK(reply.received),
		};
		unsigned char *data = __data;
		int command, ret = 0;
		u8 ackid;

		command = sp->variant->cmd.translate(data[0]);
		if (command < 0)
		return command;

		ackid = atomic_inc_return(&sp->ackid);
		reply.ackid = ackid;
		reply.code = rave_sp_reply_code((u8)command),

		mutex_lock(&sp->bus_lock);

		mutex_lock(&sp->reply_lock);
		sp->reply = &reply;
		mutex_unlock(&sp->reply_lock);

		data[0] = command;
		data[1] = ackid;

		rave_sp_write(sp, data, data_size);

		if (!wait_for_completion_timeout(&reply.received, HZ)) {
		dev_err(&sp->serdev->dev, "Command timeout\n");
		ret = -ETIMEDOUT;

		mutex_lock(&sp->reply_lock);
		sp->reply = NULL;
		mutex_unlock(&sp->reply_lock);
		}

		mutex_unlock(&sp->bus_lock);
		return ret;
		}
		EXPORT_SYMBOL_GPL(rave_sp_exec);

		static void rave_sp_receive_event(struct rave_sp *sp,
		const unsigned char *data, size_t length)
		{
		u8 cmd[] = {
		[0] = rave_sp_reply_code(data[0]),
		[1] = data[1],
		};

		rave_sp_write(sp, cmd, sizeof(cmd));

		blocking_notifier_call_chain(&sp->event_notifier_list,
		rave_sp_action_pack(data[0], data[2]),
		NULL);
		}

		static void rave_sp_receive_reply(struct rave_sp *sp,
		const unsigned char *data, size_t length)
		{
		struct device *dev = &sp->serdev->dev;
		struct rave_sp_reply *reply;
		const size_t payload_length = length - 2;

		mutex_lock(&sp->reply_lock);
		reply = sp->reply;

		if (reply) {
		if (reply->code == data[0] && reply->ackid == data[1] &&
		payload_length >= reply->length) {
		/*
		* We are relying on memcpy(dst, src, 0) to be a no-op
		* when handling commands that have a no-payload reply
		*/
		memcpy(reply->data, &data[2], reply->length);
		complete(&reply->received);
		sp->reply = NULL;
		} else {
		dev_err(dev, "Ignoring incorrect reply\n");
		dev_dbg(dev, "Code: expected = 0x%08x received = 0x%08x\n",
		reply->code, data[0]);
		dev_dbg(dev, "ACK ID: expected = 0x%08x received = 0x%08x\n",
		reply->ackid, data[1]);
		dev_dbg(dev, "Length: expected = %zu received = %zu\n",
		reply->length, payload_length);
		}
		}

		mutex_unlock(&sp->reply_lock);
		}

		static void rave_sp_receive_frame(struct rave_sp *sp,
		const unsigned char *data,
		size_t length)
		{
		const size_t checksum_length = sp->variant->checksum->length;
		const size_t payload_length = length - checksum_length;
		const u8 *crc_reported = &data[payload_length];
		struct device *dev = &sp->serdev->dev;
		u8 crc_calculated[checksum_length];

		print_hex_dump(KERN_DEBUG, "rave-sp rx: ", DUMP_PREFIX_NONE,
		16, 1, data, length, false);

		if (unlikely(length <= checksum_length)) {
		dev_warn(dev, "Dropping short frame\n");
		return;
		}

		sp->variant->checksum->subroutine(data, payload_length,
		crc_calculated);

		if (memcmp(crc_calculated, crc_reported, checksum_length)) {
		dev_warn(dev, "Dropping bad frame\n");
		return;
		}

		if (rave_sp_id_is_event(data[0]))
		rave_sp_receive_event(sp, data, length);
		else
		rave_sp_receive_reply(sp, data, length);
		}

		static int rave_sp_receive_buf(struct serdev_device *serdev,
		const unsigned char *buf, size_t size)
		{
		struct device *dev = &serdev->dev;
		struct rave_sp *sp = dev_get_drvdata(dev);
		struct rave_sp_deframer *deframer = &sp->deframer;
		const unsigned char *src = buf;
		const unsigned char *end = buf + size;

		while (src < end) {
		const unsigned char byte = *src++;

		switch (deframer->state) {
		case RAVE_SP_EXPECT_SOF:
		if (byte == RAVE_SP_STX)
		deframer->state = RAVE_SP_EXPECT_DATA;
		break;

		case RAVE_SP_EXPECT_DATA:
		/*
		* Treat special byte values first
		*/
		switch (byte) {
		case RAVE_SP_ETX:
		rave_sp_receive_frame(sp,
		deframer->data,
		deframer->length);
		/*
		* Once we extracted a complete frame
		* out of a stream, we call it done
		* and proceed to bailing out while
		* resetting the framer to initial
		* state, regardless if we've consumed
		* all of the stream or not.
		*/
		goto reset_framer;
		case RAVE_SP_STX:
		dev_warn(dev, "Bad frame: STX before ETX\n");
		/*
		* If we encounter second "start of
		* the frame" marker before seeing
		* corresponding "end of frame", we
		* reset the framer and ignore both:
		* frame started by first SOF and
		* frame started by current SOF.
		*
		* NOTE: The above means that only the
		* frame started by third SOF, sent
		* after this one will have a chance
		* to get throught.
		*/
		goto reset_framer;
		case RAVE_SP_DLE:
		deframer->state = RAVE_SP_EXPECT_ESCAPED_DATA;
		/*
		* If we encounter escape sequence we
		* need to skip it and collect the
		* byte that follows. We do it by
		* forcing the next iteration of the
		* encompassing while loop.
		*/
		continue;
		}
		/*
		* For the rest of the bytes, that are not
		* speical snoflakes, we do the same thing
		* that we do to escaped data - collect it in
		* deframer buffer
		*/

		/* FALLTHROUGH */

		case RAVE_SP_EXPECT_ESCAPED_DATA:
		deframer->data[deframer->length++] = byte;

		if (deframer->length == sizeof(deframer->data)) {
		dev_warn(dev, "Bad frame: Too long\n");
		/*
		* If the amount of data we've
		* accumulated for current frame so
		* far starts to exceed the capacity
		* of deframer's buffer, there's
		* nothing else we can do but to
		* discard that data and start
		* assemblying a new frame again
		*/
		goto reset_framer;
		}

		/*
		* We've extracted out special byte, now we
		* can go back to regular data collecting
		*/
		deframer->state = RAVE_SP_EXPECT_DATA;
		break;
		}
		}

		/*
		* The only way to get out of the above loop and end up here
		* is throught consuming all of the supplied data, so here we
		* report that we processed it all.
		*/
		return size;

		reset_framer:
		/*
		* NOTE: A number of codepaths that will drop us here will do
		* so before consuming all 'size' bytes of the data passed by
		* serdev layer. We rely on the fact that serdev layer will
		* re-execute this handler with the remainder of the Rx bytes
		* once we report actual number of bytes that we processed.
		*/
		deframer->state = RAVE_SP_EXPECT_SOF;
		deframer->length = 0;

		return src - buf;
		}

		static int rave_sp_rdu1_cmd_translate(enum rave_sp_command command)
		{
		if (command >= RAVE_SP_CMD_STATUS &&
		command <= RAVE_SP_CMD_CONTROL_EVENTS)
		return command;

		return -EINVAL;
		}

		static int rave_sp_rdu2_cmd_translate(enum rave_sp_command command)
		{
		if (command >= RAVE_SP_CMD_GET_FIRMWARE_VERSION &&
		command <= RAVE_SP_CMD_GET_GPIO_STATE)
		return command;

		if (command == RAVE_SP_CMD_REQ_COPPER_REV) {
		/*
		* As per RDU2 ICD 3.4.47 CMD_GET_COPPER_REV code is
		* different from that for RDU1 and it is set to 0x28.
		*/
		return 0x28;
		}

		return rave_sp_rdu1_cmd_translate(command);
		}

		static int rave_sp_default_cmd_translate(enum rave_sp_command command)
		{
		/*
		* All of the following command codes were taken from "Table :
		* Communications Protocol Message Types" in section 3.3
		* "MESSAGE TYPES" of Rave PIC24 ICD.
		*/
		switch (command) {
		case RAVE_SP_CMD_GET_FIRMWARE_VERSION:
		return 0x11;
		case RAVE_SP_CMD_GET_BOOTLOADER_VERSION:
		return 0x12;
		case RAVE_SP_CMD_BOOT_SOURCE:
		return 0x14;
		case RAVE_SP_CMD_SW_WDT:
		return 0x1C;
		case RAVE_SP_CMD_RESET:
		return 0x1E;
		case RAVE_SP_CMD_RESET_REASON:
		return 0x1F;
		default:
		return -EINVAL;
		}
		}

		static const struct rave_sp_checksum rave_sp_checksum_8b2c = {
		.length = 1,
		.subroutine = csum_8b2c,
		};

		static const struct rave_sp_checksum rave_sp_checksum_ccitt = {
		.length = 2,
		.subroutine = csum_ccitt,
		};

		static const struct rave_sp_variant rave_sp_legacy = {
		.checksum = &rave_sp_checksum_8b2c,
		.cmd = {
		.translate = rave_sp_default_cmd_translate,
		},
		};

		static const struct rave_sp_variant rave_sp_rdu1 = {
		.checksum = &rave_sp_checksum_8b2c,
		.cmd = {
		.translate = rave_sp_rdu1_cmd_translate,
		},
		};

		static const struct rave_sp_variant rave_sp_rdu2 = {
		.checksum = &rave_sp_checksum_ccitt,
		.cmd = {
		.translate = rave_sp_rdu2_cmd_translate,
		},
		};

		static const struct of_device_id rave_sp_dt_ids[] = {
		{ .compatible = "zii,rave-sp-niu", .data = &rave_sp_legacy },
		{ .compatible = "zii,rave-sp-mezz", .data = &rave_sp_legacy },
		{ .compatible = "zii,rave-sp-esb", .data = &rave_sp_legacy },
		{ .compatible = "zii,rave-sp-rdu1", .data = &rave_sp_rdu1 },
		{ .compatible = "zii,rave-sp-rdu2", .data = &rave_sp_rdu2 },
		{ /* sentinel */ }
		};

		static const struct serdev_device_ops rave_sp_serdev_device_ops = {
		.receive_buf = rave_sp_receive_buf,
		.write_wakeup = serdev_device_write_wakeup,
		};

		static int rave_sp_probe(struct serdev_device *serdev)
		{
		struct device *dev = &serdev->dev;
		struct rave_sp *sp;
		u32 baud;
		int ret;

		if (of_property_read_u32(dev->of_node, "current-speed", &baud)) {
		dev_err(dev,
		"'current-speed' is not specified in device node\n");
		return -EINVAL;
		}

		sp = devm_kzalloc(dev, sizeof(*sp), GFP_KERNEL);
		if (!sp)
		return -ENOMEM;

		sp->serdev = serdev;
		dev_set_drvdata(dev, sp);

		sp->variant = of_device_get_match_data(dev);
		if (!sp->variant)
		return -ENODEV;

		mutex_init(&sp->bus_lock);
		mutex_init(&sp->reply_lock);
		BLOCKING_INIT_NOTIFIER_HEAD(&sp->event_notifier_list);

		serdev_device_set_client_ops(serdev, &rave_sp_serdev_device_ops);
		ret = devm_serdev_device_open(dev, serdev);
		if (ret)
		return ret;

		serdev_device_set_baudrate(serdev, baud);

		return devm_of_platform_populate(dev);
		}

		MODULE_DEVICE_TABLE(of, rave_sp_dt_ids);

		static struct serdev_device_driver rave_sp_drv = {
		.probe = rave_sp_probe,
		.driver = {
		.name = "rave-sp",
		.of_match_table = rave_sp_dt_ids,
		},
		};
		module_serdev_device_driver(rave_sp_drv);

		MODULE_LICENSE("GPL");
		MODULE_AUTHOR("Andrey Vostrikov <andrey.vostrikov@cogentembedded.com>");
		MODULE_AUTHOR("Nikita Yushchenko <nikita.yoush@cogentembedded.com>");
		MODULE_AUTHOR("Andrey Smirnov <andrew.smirnov@gmail.com>");
		MODULE_DESCRIPTION("RAVE SP core driver");

include/linux/mfd/rave-sp.h

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Original line number	Diff line number	Diff line
		/* SPDX-License-Identifier: GPL-2.0+ */

		/*
		* Core definitions for RAVE SP MFD driver.
		*
		* Copyright (C) 2017 Zodiac Inflight Innovations
		*/

		#ifndef _LINUX_RAVE_SP_H_
		#define _LINUX_RAVE_SP_H_

		#include <linux/notifier.h>

		enum rave_sp_command {
		RAVE_SP_CMD_GET_FIRMWARE_VERSION = 0x20,
		RAVE_SP_CMD_GET_BOOTLOADER_VERSION = 0x21,
		RAVE_SP_CMD_BOOT_SOURCE = 0x26,
		RAVE_SP_CMD_GET_BOARD_COPPER_REV = 0x2B,
		RAVE_SP_CMD_GET_GPIO_STATE = 0x2F,

		RAVE_SP_CMD_STATUS = 0xA0,
		RAVE_SP_CMD_SW_WDT = 0xA1,
		RAVE_SP_CMD_PET_WDT = 0xA2,
		RAVE_SP_CMD_RESET = 0xA7,
		RAVE_SP_CMD_RESET_REASON = 0xA8,

		RAVE_SP_CMD_REQ_COPPER_REV = 0xB6,
		RAVE_SP_CMD_GET_I2C_DEVICE_STATUS = 0xBA,
		RAVE_SP_CMD_GET_SP_SILICON_REV = 0xB9,
		RAVE_SP_CMD_CONTROL_EVENTS = 0xBB,

		RAVE_SP_EVNT_BASE = 0xE0,
		};

		struct rave_sp;

		static inline unsigned long rave_sp_action_pack(u8 event, u8 value)
		{
		return ((unsigned long)value << 8) \| event;
		}

		static inline u8 rave_sp_action_unpack_event(unsigned long action)
		{
		return action;
		}

		static inline u8 rave_sp_action_unpack_value(unsigned long action)
		{
		return action >> 8;
		}

		int rave_sp_exec(struct rave_sp *sp,
		void *__data, size_t data_size,
		void *reply_data, size_t reply_data_size);

		struct device;
		int devm_rave_sp_register_event_notifier(struct device *dev,
		struct notifier_block *nb);

		#endif /* _LINUX_RAVE_SP_H_ */

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