// SPDX-License-Identifier: GPL-2.0-only

  /*
   *  PS3 System Manager.
   *
   *  Copyright (C) 2007 Sony Computer Entertainment Inc.
   *  Copyright 2007 Sony Corp.

   */
  
  #include <linux/kernel.h>
  #include <linux/module.h>
  #include <linux/workqueue.h>
  #include <linux/reboot.h>

  #include <linux/sched/signal.h>

  
  #include <asm/firmware.h>

  #include <asm/lv1call.h>

  #include <asm/ps3.h>

  #include "vuart.h"

  /**
   * ps3_sys_manager - PS3 system manager driver.
   *

   * The system manager provides an asynchronous system event notification

   * mechanism for reporting events like thermal alert and button presses to
   * guests.  It also provides support to control system shutdown and startup.
   *
   * The actual system manager is implemented as an application running in the
   * system policy module in lpar_1.  Guests communicate with the system manager
   * through port 2 of the vuart using a simple packet message protocol.
   * Messages are comprised of a fixed field header followed by a message
   * specific payload.
   */
  
  /**
   * struct ps3_sys_manager_header - System manager message header.
   * @version: Header version, currently 1.

   * @size: Header size in bytes, currently 16.

   * @payload_size: Message payload size in bytes.
   * @service_id: Message type, one of enum ps3_sys_manager_service_id.

   * @request_tag: Unique number to identify reply.

   */
  
  struct ps3_sys_manager_header {
  	/* version 1 */
  	u8 version;
  	u8 size;
  	u16 reserved_1;
  	u32 payload_size;
  	u16 service_id;

  	u16 reserved_2;
  	u32 request_tag;

  };

  #define dump_sm_header(_h) _dump_sm_header(_h, __func__, __LINE__)
  static void __maybe_unused _dump_sm_header(
  	const struct ps3_sys_manager_header *h, const char *func, int line)
  {
  	pr_debug("%s:%d: version:      %xh
  ", func, line, h->version);
  	pr_debug("%s:%d: size:         %xh
  ", func, line, h->size);
  	pr_debug("%s:%d: payload_size: %xh
  ", func, line, h->payload_size);
  	pr_debug("%s:%d: service_id:   %xh
  ", func, line, h->service_id);
  	pr_debug("%s:%d: request_tag:  %xh
  ", func, line, h->request_tag);
  }

  /**

   * @PS3_SM_RX_MSG_LEN_MIN - Shortest received message length.
   * @PS3_SM_RX_MSG_LEN_MAX - Longest received message length.

   *

   * Currently all messages received from the system manager are either
   * (16 bytes header + 8 bytes payload = 24 bytes) or (16 bytes header

   * + 16 bytes payload = 32 bytes).  This knowledge is used to simplify

   * the logic.

   */
  
  enum {

  	PS3_SM_RX_MSG_LEN_MIN = 24,
  	PS3_SM_RX_MSG_LEN_MAX = 32,

  };
  
  /**
   * enum ps3_sys_manager_service_id - Message header service_id.

   * @PS3_SM_SERVICE_ID_REQUEST:       guest --> sys_manager.
   * @PS3_SM_SERVICE_ID_REQUEST_ERROR: guest <-- sys_manager.
   * @PS3_SM_SERVICE_ID_COMMAND:       guest <-- sys_manager.
   * @PS3_SM_SERVICE_ID_RESPONSE:      guest --> sys_manager.
   * @PS3_SM_SERVICE_ID_SET_ATTR:      guest --> sys_manager.
   * @PS3_SM_SERVICE_ID_EXTERN_EVENT:  guest <-- sys_manager.
   * @PS3_SM_SERVICE_ID_SET_NEXT_OP:   guest --> sys_manager.
   *
   * PS3_SM_SERVICE_ID_REQUEST_ERROR is returned for invalid data values in a
   * a PS3_SM_SERVICE_ID_REQUEST message.  It also seems to be returned when
   * a REQUEST message is sent at the wrong time.

   */
  
  enum ps3_sys_manager_service_id {
  	/* version 1 */
  	PS3_SM_SERVICE_ID_REQUEST = 1,
  	PS3_SM_SERVICE_ID_RESPONSE = 2,
  	PS3_SM_SERVICE_ID_COMMAND = 3,
  	PS3_SM_SERVICE_ID_EXTERN_EVENT = 4,
  	PS3_SM_SERVICE_ID_SET_NEXT_OP = 5,

  	PS3_SM_SERVICE_ID_REQUEST_ERROR = 6,

  	PS3_SM_SERVICE_ID_SET_ATTR = 8,
  };
  
  /**
   * enum ps3_sys_manager_attr - Notification attribute (bit position mask).
   * @PS3_SM_ATTR_POWER: Power button.
   * @PS3_SM_ATTR_RESET: Reset button, not available on retail console.

   * @PS3_SM_ATTR_THERMAL: System thermal alert.

   * @PS3_SM_ATTR_CONTROLLER: Remote controller event.
   * @PS3_SM_ATTR_ALL: Logical OR of all.
   *
   * The guest tells the system manager which events it is interested in receiving
   * notice of by sending the system manager a logical OR of notification
   * attributes via the ps3_sys_manager_send_attr() routine.
   */
  
  enum ps3_sys_manager_attr {
  	/* version 1 */
  	PS3_SM_ATTR_POWER = 1,
  	PS3_SM_ATTR_RESET = 2,
  	PS3_SM_ATTR_THERMAL = 4,
  	PS3_SM_ATTR_CONTROLLER = 8, /* bogus? */
  	PS3_SM_ATTR_ALL = 0x0f,
  };
  
  /**
   * enum ps3_sys_manager_event - External event type, reported by system manager.

   * @PS3_SM_EVENT_POWER_PRESSED: payload.value =
   *  enum ps3_sys_manager_button_event.

   * @PS3_SM_EVENT_POWER_RELEASED: payload.value = time pressed in millisec.

   * @PS3_SM_EVENT_RESET_PRESSED: payload.value =
   *  enum ps3_sys_manager_button_event.

   * @PS3_SM_EVENT_RESET_RELEASED: payload.value = time pressed in millisec.
   * @PS3_SM_EVENT_THERMAL_ALERT: payload.value = thermal zone id.
   * @PS3_SM_EVENT_THERMAL_CLEARED: payload.value = thermal zone id.
   */
  
  enum ps3_sys_manager_event {
  	/* version 1 */
  	PS3_SM_EVENT_POWER_PRESSED = 3,
  	PS3_SM_EVENT_POWER_RELEASED = 4,
  	PS3_SM_EVENT_RESET_PRESSED = 5,
  	PS3_SM_EVENT_RESET_RELEASED = 6,
  	PS3_SM_EVENT_THERMAL_ALERT = 7,
  	PS3_SM_EVENT_THERMAL_CLEARED = 8,
  	/* no info on controller events */
  };
  
  /**

   * enum ps3_sys_manager_button_event - Button event payload values.
   * @PS3_SM_BUTTON_EVENT_HARD: Hardware generated event.
   * @PS3_SM_BUTTON_EVENT_SOFT: Software generated event.
   */
  
  enum ps3_sys_manager_button_event {
  	PS3_SM_BUTTON_EVENT_HARD = 0,
  	PS3_SM_BUTTON_EVENT_SOFT = 1,
  };
  
  /**

   * enum ps3_sys_manager_next_op - Operation to perform after lpar is destroyed.
   */
  
  enum ps3_sys_manager_next_op {
  	/* version 3 */
  	PS3_SM_NEXT_OP_SYS_SHUTDOWN = 1,
  	PS3_SM_NEXT_OP_SYS_REBOOT = 2,
  	PS3_SM_NEXT_OP_LPAR_REBOOT = 0x82,
  };
  
  /**
   * enum ps3_sys_manager_wake_source - Next-op wakeup source (bit position mask).

   * @PS3_SM_WAKE_DEFAULT: Disk insert, power button, eject button.

   * @PS3_SM_WAKE_W_O_L: Ether or wireless LAN.

   * @PS3_SM_WAKE_P_O_R: Power on reset.
   *
   * Additional wakeup sources when specifying PS3_SM_NEXT_OP_SYS_SHUTDOWN.

   * The system will always wake from the PS3_SM_WAKE_DEFAULT sources.
   * Sources listed here are the only ones available to guests in the
   * other-os lpar.

   */
  
  enum ps3_sys_manager_wake_source {
  	/* version 3 */
  	PS3_SM_WAKE_DEFAULT   = 0,

  	PS3_SM_WAKE_W_O_L     = 0x00000400,

  	PS3_SM_WAKE_P_O_R     = 0x80000000,

  };
  
  /**

   * user_wake_sources - User specified wakeup sources.
   *
   * Logical OR of enum ps3_sys_manager_wake_source types.
   */
  
  static u32 user_wake_sources = PS3_SM_WAKE_DEFAULT;
  
  /**

   * enum ps3_sys_manager_cmd - Command from system manager to guest.
   *
   * The guest completes the actions needed, then acks or naks the command via
   * ps3_sys_manager_send_response().  In the case of @PS3_SM_CMD_SHUTDOWN,
   * the guest must be fully prepared for a system poweroff prior to acking the
   * command.
   */
  
  enum ps3_sys_manager_cmd {
  	/* version 1 */
  	PS3_SM_CMD_SHUTDOWN = 1, /* shutdown guest OS */
  };
  
  /**

   * ps3_sm_force_power_off - Poweroff helper.
   *
   * A global variable used to force a poweroff when the power button has
   * been pressed irrespective of how init handles the ctrl_alt_del signal.
   *
   */
  
  static unsigned int ps3_sm_force_power_off;
  
  /**

   * ps3_sys_manager_write - Helper to write a two part message to the vuart.
   *
   */

  static int ps3_sys_manager_write(struct ps3_system_bus_device *dev,

  	const struct ps3_sys_manager_header *header, const void *payload)
  {
  	int result;
  
  	BUG_ON(header->version != 1);
  	BUG_ON(header->size != 16);
  	BUG_ON(header->payload_size != 8 && header->payload_size != 16);
  	BUG_ON(header->service_id > 8);
  
  	result = ps3_vuart_write(dev, header,
  		sizeof(struct ps3_sys_manager_header));
  
  	if (!result)
  		result = ps3_vuart_write(dev, payload, header->payload_size);
  
  	return result;
  }
  
  /**
   * ps3_sys_manager_send_attr - Send a 'set attribute' to the system manager.
   *
   */

  static int ps3_sys_manager_send_attr(struct ps3_system_bus_device *dev,

  	enum ps3_sys_manager_attr attr)
  {

  	struct ps3_sys_manager_header header;

  	struct {
  		u8 version;
  		u8 reserved_1[3];
  		u32 attribute;
  	} payload;
  
  	BUILD_BUG_ON(sizeof(payload) != 8);
  
  	dev_dbg(&dev->core, "%s:%d: %xh
  ", __func__, __LINE__, attr);

  	memset(&header, 0, sizeof(header));
  	header.version = 1;
  	header.size = 16;
  	header.payload_size = 16;
  	header.service_id = PS3_SM_SERVICE_ID_SET_ATTR;

  	memset(&payload, 0, sizeof(payload));
  	payload.version = 1;
  	payload.attribute = attr;
  
  	return ps3_sys_manager_write(dev, &header, &payload);
  }
  
  /**
   * ps3_sys_manager_send_next_op - Send a 'set next op' to the system manager.
   *
   * Tell the system manager what to do after this lpar is destroyed.
   */

  static int ps3_sys_manager_send_next_op(struct ps3_system_bus_device *dev,

  	enum ps3_sys_manager_next_op op,
  	enum ps3_sys_manager_wake_source wake_source)
  {

  	struct ps3_sys_manager_header header;

  	struct {
  		u8 version;
  		u8 type;
  		u8 gos_id;
  		u8 reserved_1;
  		u32 wake_source;
  		u8 reserved_2[8];
  	} payload;
  
  	BUILD_BUG_ON(sizeof(payload) != 16);
  
  	dev_dbg(&dev->core, "%s:%d: (%xh)
  ", __func__, __LINE__, op);

  	memset(&header, 0, sizeof(header));
  	header.version = 1;
  	header.size = 16;
  	header.payload_size = 16;
  	header.service_id = PS3_SM_SERVICE_ID_SET_NEXT_OP;

  	memset(&payload, 0, sizeof(payload));
  	payload.version = 3;
  	payload.type = op;
  	payload.gos_id = 3; /* other os */
  	payload.wake_source = wake_source;
  
  	return ps3_sys_manager_write(dev, &header, &payload);
  }
  
  /**
   * ps3_sys_manager_send_request_shutdown - Send 'request' to the system manager.
   *
   * The guest sends this message to request an operation or action of the system
   * manager.  The reply is a command message from the system manager.  In the
   * command handler the guest performs the requested operation.  The result of
   * the command is then communicated back to the system manager with a response
   * message.
   *

   * Currently, the only supported request is the 'shutdown self' request.

   */

  static int ps3_sys_manager_send_request_shutdown(
  	struct ps3_system_bus_device *dev)

  {

  	struct ps3_sys_manager_header header;

  	struct {
  		u8 version;
  		u8 type;
  		u8 gos_id;
  		u8 reserved_1[13];

  	} payload;

  
  	BUILD_BUG_ON(sizeof(payload) != 16);
  
  	dev_dbg(&dev->core, "%s:%d
  ", __func__, __LINE__);

  	memset(&header, 0, sizeof(header));
  	header.version = 1;
  	header.size = 16;
  	header.payload_size = 16;
  	header.service_id = PS3_SM_SERVICE_ID_REQUEST;
  
  	memset(&payload, 0, sizeof(payload));
  	payload.version = 1;
  	payload.type = 1; /* shutdown */
  	payload.gos_id = 0; /* self */

  	return ps3_sys_manager_write(dev, &header, &payload);
  }
  
  /**
   * ps3_sys_manager_send_response - Send a 'response' to the system manager.
   * @status: zero = success, others fail.
   *
   * The guest sends this message to the system manager to acnowledge success or
   * failure of a command sent by the system manager.
   */

  static int ps3_sys_manager_send_response(struct ps3_system_bus_device *dev,

  	u64 status)
  {

  	struct ps3_sys_manager_header header;

  	struct {
  		u8 version;
  		u8 reserved_1[3];
  		u8 status;
  		u8 reserved_2[11];
  	} payload;
  
  	BUILD_BUG_ON(sizeof(payload) != 16);
  
  	dev_dbg(&dev->core, "%s:%d: (%s)
  ", __func__, __LINE__,
  		(status ? "nak" : "ack"));

  	memset(&header, 0, sizeof(header));
  	header.version = 1;
  	header.size = 16;
  	header.payload_size = 16;
  	header.service_id = PS3_SM_SERVICE_ID_RESPONSE;

  	memset(&payload, 0, sizeof(payload));
  	payload.version = 1;
  	payload.status = status;
  
  	return ps3_sys_manager_write(dev, &header, &payload);
  }
  
  /**
   * ps3_sys_manager_handle_event - Second stage event msg handler.
   *
   */

  static int ps3_sys_manager_handle_event(struct ps3_system_bus_device *dev)

  {
  	int result;
  	struct {
  		u8 version;
  		u8 type;
  		u8 reserved_1[2];
  		u32 value;
  		u8 reserved_2[8];
  	} event;
  
  	BUILD_BUG_ON(sizeof(event) != 16);
  
  	result = ps3_vuart_read(dev, &event, sizeof(event));

  	BUG_ON(result && "need to retry here");

  
  	if (event.version != 1) {
  		dev_dbg(&dev->core, "%s:%d: unsupported event version (%u)
  ",
  			__func__, __LINE__, event.version);
  		return -EIO;
  	}
  
  	switch (event.type) {
  	case PS3_SM_EVENT_POWER_PRESSED:

  		dev_dbg(&dev->core, "%s:%d: POWER_PRESSED (%s)
  ",
  			__func__, __LINE__,
  			(event.value == PS3_SM_BUTTON_EVENT_SOFT ? "soft"
  			: "hard"));

  		ps3_sm_force_power_off = 1;
  		/*
  		 * A memory barrier is use here to sync memory since
  		 * ps3_sys_manager_final_restart() could be called on
  		 * another cpu.
  		 */
  		wmb();
  		kill_cad_pid(SIGINT, 1); /* ctrl_alt_del */

  		break;
  	case PS3_SM_EVENT_POWER_RELEASED:
  		dev_dbg(&dev->core, "%s:%d: POWER_RELEASED (%u ms)
  ",
  			__func__, __LINE__, event.value);

  		break;
  	case PS3_SM_EVENT_RESET_PRESSED:

  		dev_dbg(&dev->core, "%s:%d: RESET_PRESSED (%s)
  ",
  			__func__, __LINE__,
  			(event.value == PS3_SM_BUTTON_EVENT_SOFT ? "soft"
  			: "hard"));

  		ps3_sm_force_power_off = 0;
  		/*
  		 * A memory barrier is use here to sync memory since
  		 * ps3_sys_manager_final_restart() could be called on
  		 * another cpu.
  		 */
  		wmb();
  		kill_cad_pid(SIGINT, 1); /* ctrl_alt_del */
  		break;
  	case PS3_SM_EVENT_RESET_RELEASED:
  		dev_dbg(&dev->core, "%s:%d: RESET_RELEASED (%u ms)
  ",
  			__func__, __LINE__, event.value);

  		break;
  	case PS3_SM_EVENT_THERMAL_ALERT:
  		dev_dbg(&dev->core, "%s:%d: THERMAL_ALERT (zone %u)
  ",
  			__func__, __LINE__, event.value);

  		pr_info("PS3 Thermal Alert Zone %u
  ", event.value);

  		break;
  	case PS3_SM_EVENT_THERMAL_CLEARED:
  		dev_dbg(&dev->core, "%s:%d: THERMAL_CLEARED (zone %u)
  ",
  			__func__, __LINE__, event.value);
  		break;
  	default:
  		dev_dbg(&dev->core, "%s:%d: unknown event (%u)
  ",
  			__func__, __LINE__, event.type);
  		return -EIO;
  	}
  
  	return 0;
  }
  /**
   * ps3_sys_manager_handle_cmd - Second stage command msg handler.
   *
   * The system manager sends this in reply to a 'request' message from the guest.
   */

  static int ps3_sys_manager_handle_cmd(struct ps3_system_bus_device *dev)

  {
  	int result;
  	struct {
  		u8 version;
  		u8 type;
  		u8 reserved_1[14];
  	} cmd;
  
  	BUILD_BUG_ON(sizeof(cmd) != 16);
  
  	dev_dbg(&dev->core, "%s:%d
  ", __func__, __LINE__);
  
  	result = ps3_vuart_read(dev, &cmd, sizeof(cmd));

  	BUG_ON(result && "need to retry here");

  	if (result)

  		return result;
  
  	if (cmd.version != 1) {
  		dev_dbg(&dev->core, "%s:%d: unsupported cmd version (%u)
  ",
  			__func__, __LINE__, cmd.version);
  		return -EIO;
  	}
  
  	if (cmd.type != PS3_SM_CMD_SHUTDOWN) {
  		dev_dbg(&dev->core, "%s:%d: unknown cmd (%u)
  ",
  			__func__, __LINE__, cmd.type);
  		return -EIO;
  	}
  
  	ps3_sys_manager_send_response(dev, 0);
  	return 0;
  }
  
  /**
   * ps3_sys_manager_handle_msg - First stage msg handler.
   *

   * Can be called directly to manually poll vuart and pump message handler.

   */

  static int ps3_sys_manager_handle_msg(struct ps3_system_bus_device *dev)

  {
  	int result;
  	struct ps3_sys_manager_header header;
  
  	result = ps3_vuart_read(dev, &header,
  		sizeof(struct ps3_sys_manager_header));

  	if (result)

  		return result;
  
  	if (header.version != 1) {
  		dev_dbg(&dev->core, "%s:%d: unsupported header version (%u)
  ",
  			__func__, __LINE__, header.version);

  		dump_sm_header(&header);

  		goto fail_header;
  	}
  
  	BUILD_BUG_ON(sizeof(header) != 16);

  
  	if (header.size != 16 || (header.payload_size != 8
  		&& header.payload_size != 16)) {
  		dump_sm_header(&header);
  		BUG();
  	}

  
  	switch (header.service_id) {
  	case PS3_SM_SERVICE_ID_EXTERN_EVENT:
  		dev_dbg(&dev->core, "%s:%d: EVENT
  ", __func__, __LINE__);
  		return ps3_sys_manager_handle_event(dev);
  	case PS3_SM_SERVICE_ID_COMMAND:
  		dev_dbg(&dev->core, "%s:%d: COMMAND
  ", __func__, __LINE__);
  		return ps3_sys_manager_handle_cmd(dev);

  	case PS3_SM_SERVICE_ID_REQUEST_ERROR:
  		dev_dbg(&dev->core, "%s:%d: REQUEST_ERROR
  ", __func__,
  			__LINE__);
  		dump_sm_header(&header);
  		break;

  	default:
  		dev_dbg(&dev->core, "%s:%d: unknown service_id (%u)
  ",
  			__func__, __LINE__, header.service_id);
  		break;
  	}
  	goto fail_id;
  
  fail_header:
  	ps3_vuart_clear_rx_bytes(dev, 0);
  	return -EIO;
  fail_id:
  	ps3_vuart_clear_rx_bytes(dev, header.payload_size);
  	return -EIO;
  }

  static void ps3_sys_manager_fin(struct ps3_system_bus_device *dev)
  {
  	ps3_sys_manager_send_request_shutdown(dev);
  
  	pr_emerg("System Halted, OK to turn off power
  ");
  
  	while (ps3_sys_manager_handle_msg(dev)) {
  		/* pause until next DEC interrupt */
  		lv1_pause(0);
  	}
  
  	while (1) {
  		/* pause, ignoring DEC interrupt */
  		lv1_pause(1);
  	}
  }

  /**

   * ps3_sys_manager_final_power_off - The final platform machine_power_off routine.

   *

   * This routine never returns.  The routine disables asynchronous vuart reads

   * then spins calling ps3_sys_manager_handle_msg() to receive and acknowledge
   * the shutdown command sent from the system manager.  Soon after the
   * acknowledgement is sent the lpar is destroyed by the HV.  This routine

   * should only be called from ps3_power_off() through
   * ps3_sys_manager_ops.power_off.

   */

  static void ps3_sys_manager_final_power_off(struct ps3_system_bus_device *dev)

  {

  	BUG_ON(!dev);

  
  	dev_dbg(&dev->core, "%s:%d
  ", __func__, __LINE__);
  
  	ps3_vuart_cancel_async(dev);

  	ps3_sys_manager_send_next_op(dev, PS3_SM_NEXT_OP_SYS_SHUTDOWN,

  		user_wake_sources);

  	ps3_sys_manager_fin(dev);

  }
  
  /**

   * ps3_sys_manager_final_restart - The final platform machine_restart routine.

   *

   * This routine never returns.  The routine disables asynchronous vuart reads

   * then spins calling ps3_sys_manager_handle_msg() to receive and acknowledge
   * the shutdown command sent from the system manager.  Soon after the
   * acknowledgement is sent the lpar is destroyed by the HV.  This routine

   * should only be called from ps3_restart() through ps3_sys_manager_ops.restart.

   */

  static void ps3_sys_manager_final_restart(struct ps3_system_bus_device *dev)

  {

  	BUG_ON(!dev);

  
  	dev_dbg(&dev->core, "%s:%d
  ", __func__, __LINE__);

  	/* Check if we got here via a power button event. */
  
  	if (ps3_sm_force_power_off) {
  		dev_dbg(&dev->core, "%s:%d: forcing poweroff
  ",
  			__func__, __LINE__);
  		ps3_sys_manager_final_power_off(dev);
  	}

  	ps3_vuart_cancel_async(dev);

  	ps3_sys_manager_send_attr(dev, 0);

  	ps3_sys_manager_send_next_op(dev, PS3_SM_NEXT_OP_SYS_REBOOT,

  		user_wake_sources);

  	ps3_sys_manager_fin(dev);

  }

  /**

   * ps3_sys_manager_get_wol - Get wake-on-lan setting.
   */
  
  int ps3_sys_manager_get_wol(void)
  {
  	pr_debug("%s:%d
  ", __func__, __LINE__);
  
  	return (user_wake_sources & PS3_SM_WAKE_W_O_L) != 0;
  }
  EXPORT_SYMBOL_GPL(ps3_sys_manager_get_wol);
  
  /**
   * ps3_sys_manager_set_wol - Set wake-on-lan setting.
   */
  
  void ps3_sys_manager_set_wol(int state)
  {
  	static DEFINE_MUTEX(mutex);
  
  	mutex_lock(&mutex);
  
  	pr_debug("%s:%d: %d
  ", __func__, __LINE__, state);
  
  	if (state)
  		user_wake_sources |= PS3_SM_WAKE_W_O_L;
  	else
  		user_wake_sources &= ~PS3_SM_WAKE_W_O_L;
  	mutex_unlock(&mutex);
  }
  EXPORT_SYMBOL_GPL(ps3_sys_manager_set_wol);
  
  /**

   * ps3_sys_manager_work - Asynchronous read handler.
   *
   * Signaled when PS3_SM_RX_MSG_LEN_MIN bytes arrive at the vuart port.
   */
  
  static void ps3_sys_manager_work(struct ps3_system_bus_device *dev)
  {
  	ps3_sys_manager_handle_msg(dev);
  	ps3_vuart_read_async(dev, PS3_SM_RX_MSG_LEN_MIN);
  }

  static int ps3_sys_manager_probe(struct ps3_system_bus_device *dev)

  {
  	int result;

  	struct ps3_sys_manager_ops ops;

  
  	dev_dbg(&dev->core, "%s:%d
  ", __func__, __LINE__);

  	ops.power_off = ps3_sys_manager_final_power_off;
  	ops.restart = ps3_sys_manager_final_restart;
  	ops.dev = dev;
  
  	/* ps3_sys_manager_register_ops copies ops. */
  
  	ps3_sys_manager_register_ops(&ops);

  
  	result = ps3_sys_manager_send_attr(dev, PS3_SM_ATTR_ALL);
  	BUG_ON(result);

  	result = ps3_vuart_read_async(dev, PS3_SM_RX_MSG_LEN_MIN);

  	BUG_ON(result);
  
  	return result;
  }

  static int ps3_sys_manager_remove(struct ps3_system_bus_device *dev)
  {
  	dev_dbg(&dev->core, "%s:%d
  ", __func__, __LINE__);
  	return 0;
  }
  
  static void ps3_sys_manager_shutdown(struct ps3_system_bus_device *dev)
  {
  	dev_dbg(&dev->core, "%s:%d
  ", __func__, __LINE__);
  }

  static struct ps3_vuart_port_driver ps3_sys_manager = {

  	.core.match_id = PS3_MATCH_ID_SYSTEM_MANAGER,
  	.core.core.name = "ps3_sys_manager",

  	.probe = ps3_sys_manager_probe,

  	.remove = ps3_sys_manager_remove,
  	.shutdown = ps3_sys_manager_shutdown,
  	.work = ps3_sys_manager_work,

  };
  
  static int __init ps3_sys_manager_init(void)
  {

  	if (!firmware_has_feature(FW_FEATURE_PS3_LV1))
  		return -ENODEV;

  	return ps3_vuart_port_driver_register(&ps3_sys_manager);
  }
  
  module_init(ps3_sys_manager_init);

  /* Module remove not supported. */

  MODULE_AUTHOR("Sony Corporation");
  MODULE_LICENSE("GPL v2");
  MODULE_DESCRIPTION("PS3 System Manager");

  MODULE_ALIAS(PS3_MODULE_ALIAS_SYSTEM_MANAGER);