include/linux/spmi.h - kernel/msm - Gitiles

 /* Copyright (c) 2012, The Linux Foundation. All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 and
  * only version 2 as published by the Free Software Foundation.
  *
  * This program is distributed in the hope that 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.
  */

 #ifndef _LINUX_SPMI_H
 #define _LINUX_SPMI_H

 #include <linux/types.h>
 #include <linux/device.h>
 #include <linux/mod_devicetable.h>

 /* Maximum slave identifier */
 #define SPMI_MAX_SLAVE_ID		16

 /* SPMI Commands */
 enum spmi_commands {
 	SPMI_CMD_EXT_WRITE = 0x00,
 	SPMI_CMD_RESET = 0x10,
 	SPMI_CMD_SLEEP = 0x11,
 	SPMI_CMD_SHUTDOWN = 0x12,
 	SPMI_CMD_WAKEUP = 0x13,
 	SPMI_CMD_AUTHENTICATE = 0x14,
 	SPMI_CMD_MSTR_READ = 0x15,
 	SPMI_CMD_MSTR_WRITE = 0x16,
 	SPMI_CMD_TRANSFER_BUS_OWNERSHIP = 0x1A,
 	SPMI_CMD_DDB_MASTER_READ = 0x1B,
 	SPMI_CMD_DDB_SLAVE_READ = 0x1C,
 	SPMI_CMD_EXT_READ = 0x20,
 	SPMI_CMD_EXT_WRITEL = 0x30,
 	SPMI_CMD_EXT_READL = 0x38,
 	SPMI_CMD_WRITE = 0x40,
 	SPMI_CMD_READ = 0x60,
 	SPMI_CMD_ZERO_WRITE = 0x80,
 };

 struct spmi_device;

 /**
  * struct spmi_controller: interface to the SPMI master controller
  * @nr: board-specific number identifier for this controller/bus
  * @name: name for this controller
  * @cmd: sends a non-data command sequence on the SPMI bus.
  * @read_cmd: sends a register read command sequence on the SPMI bus.
  * @write_cmd: sends a register write command sequence on the SPMI bus.
  */
 struct spmi_controller {
 	struct device		dev;
 	unsigned int		nr;
 	struct list_head	list;
 	int		(*cmd)(struct spmi_controller *, u8 opcode, u8 sid);
 	int		(*read_cmd)(struct spmi_controller *,
 				u8 opcode, u8 sid, u16 addr, u8 bc, u8 *buf);
 	int		(*write_cmd)(struct spmi_controller *,
 				u8 opcode, u8 sid, u16 addr, u8 bc, u8 *buf);
 };
 #define to_spmi_controller(d) container_of(d, struct spmi_controller, dev)

 /**
  * struct spmi_driver: Manage SPMI generic/slave device driver
  * @probe: binds this driver to a SPMI device.
  * @remove: unbinds this driver from the SPMI device.
  * @shutdown: standard shutdown callback used during powerdown/halt.
  * @suspend: standard suspend callback used during system suspend
  * @resume: standard resume callback used during system resume
  * @driver: SPMI device drivers should initialize name and owner field of
  *	    this structure
  * @id_table: list of SPMI devices supported by this driver
  */
 struct spmi_driver {
 	int				(*probe)(struct spmi_device *dev);
 	int				(*remove)(struct spmi_device *dev);
 	void				(*shutdown)(struct spmi_device *dev);
 	int				(*suspend)(struct spmi_device *dev,
 					pm_message_t pmesg);
 	int				(*resume)(struct spmi_device *dev);

 	struct device_driver		driver;
 	const struct spmi_device_id	*id_table;
 };
 #define to_spmi_driver(d) container_of(d, struct spmi_driver, driver)

 /**
  * struct spmi_resource: spmi_resource for one device_node
  * @num_resources: number of resources for this device node
  * @resources: array of resources for this device_node
  * @of_node: device_node of the resource in question
  * @label: name used to reference the device from the driver
  *
  * Note that we explicitly add a 'label' pointer here since per
  * the ePAPR 2.2.2, the device_node->name should be generic and not
  * reflect precise programming model. Thus label enables a
  * platform specific name to be assigned with the 'label' binding to
  * allow for unique query names.
  */
 struct spmi_resource {
 	struct resource		*resource;
 	u32			num_resources;
 	struct device_node	*of_node;
 	const char		*label;
 };

 /**
  * Client/device handle (struct spmi_device):
  * ------------------------------------------
  *  This is the client/device handle returned when a SPMI device
  *  is registered with a controller.
  *  Pointer to this structure is used by client-driver as a handle.
  *  @dev: Driver model representation of the device.
  *  @name: Name of driver to use with this device.
  *  @ctrl: SPMI controller managing the bus hosting this device.
  *  @res: SPMI resource for the primary node
  *  @dev_node: array of SPMI resources when used with spmi-dev-container.
  *  @num_dev_node: number of device_node structures.
  *  @sid: Slave Identifier.
  */
 struct spmi_device {
 	struct device		dev;
 	const char		*name;
 	struct spmi_controller	*ctrl;
 	struct spmi_resource	res;
 	struct spmi_resource	*dev_node;
 	u32			num_dev_node;
 	u8			sid;
 };
 #define to_spmi_device(d) container_of(d, struct spmi_device, dev)

 /**
  * struct spmi_boardinfo: Declare board info for SPMI device bringup.
  * @name: Name of driver to use with this device.
  * @slave_id: slave identifier.
  * @spmi_device: device to be registered with the SPMI framework.
  * @of_node: pointer to the OpenFirmware device node.
  * @res: SPMI resource for the primary node
  * @dev_node: array of SPMI resources when used with spmi-dev-container.
  * @num_dev_node: number of device_node structures.
  * @platform_data: goes to spmi_device.dev.platform_data
  */
 struct spmi_boardinfo {
 	char			name[SPMI_NAME_SIZE];
 	uint8_t			slave_id;
 	struct device_node	*of_node;
 	struct spmi_resource	res;
 	struct spmi_resource	*dev_node;
 	u32			num_dev_node;
 	const void		*platform_data;
 };

 /**
  * spmi_driver_register: Client driver registration with SPMI framework.
  * @drv: client driver to be associated with client-device.
  *
  * This API will register the client driver with the SPMI framework.
  * It is called from the driver's module-init function.
  */
 extern int spmi_driver_register(struct spmi_driver *drv);

 /**
  * spmi_driver_unregister - reverse effect of spmi_driver_register
  * @sdrv: the driver to unregister
  * Context: can sleep
  */
 static inline void spmi_driver_unregister(struct spmi_driver *sdrv)
 {
 	if (sdrv)
 		driver_unregister(&sdrv->driver);
 }

 /**
  * spmi_add_controller: Controller bring-up.
  * @ctrl: controller to be registered.
  *
  * A controller is registered with the framework using this API. ctrl->nr is the
  * desired number with which SPMI framework registers the controller.
  * Function will return -EBUSY if the number is in use.
  */
 extern int spmi_add_controller(struct spmi_controller *ctrl);

 /**
  * spmi_del_controller: Controller tear-down.
  * Controller added with the above API is teared down using this API.
  */
 extern int spmi_del_controller(struct spmi_controller *ctrl);

 /**
  * spmi_busnum_to_ctrl: Map bus number to controller
  * @busnum: bus number
  *
  * Returns controller device representing this bus number
  */
 extern struct spmi_controller *spmi_busnum_to_ctrl(u32 bus_num);

 /**
  * spmi_alloc_device: Allocate a new SPMI devices.
  * @ctrl: controller to which this device is to be added to.
  * Context: can sleep
  *
  * Allows a driver to allocate and initialize a SPMI device without
  * registering it immediately.  This allows a driver to directly fill
  * the spmi_device structure before calling spmi_add_device().
  *
  * Caller is responsible to call spmi_add_device() on the returned
  * spmi_device.  If the caller needs to discard the spmi_device without
  * adding it, then spmi_dev_put() should be called.
  */
 extern struct spmi_device *spmi_alloc_device(struct spmi_controller *ctrl);

 /**
  * spmi_add_device: Add spmi_device allocated with spmi_alloc_device().
  * @spmi_dev: spmi_device to be added (registered).
  */
 extern int spmi_add_device(struct spmi_device *spmi_dev);

 /**
  * spmi_new_device: Instantiates a new SPMI device
  * @ctrl: controller to which this device is to be added to.
  * @info: board information for this device.
  *
  * Returns the new device or NULL.
  */
 extern struct spmi_device *spmi_new_device(struct spmi_controller *ctrl,
 					struct spmi_boardinfo const *info);

 /* spmi_remove_device: Remove the effect of spmi_add_device() */
 extern void spmi_remove_device(struct spmi_device *spmi_dev);

 #ifdef CONFIG_SPMI
 /**
  * spmi_register_board_info: Board-initialization routine.
  * @bus_num: controller number (bus) on which this device will sit.
  * @info: list of all devices on all controllers present on the board.
  * @n: number of entries.
  *
  * API enumerates respective devices on corresponding controller.
  * Called from board-init function.
  */
 extern int spmi_register_board_info(int busnum,
 			struct spmi_boardinfo const *info, unsigned n);
 #else
 static inline int spmi_register_board_info(int busnum,
 			struct spmi_boardinfo const *info, unsigned n)
 {
 	return 0;
 }
 #endif

 static inline void *spmi_get_ctrldata(const struct spmi_controller *ctrl)
 {
 	return dev_get_drvdata(&ctrl->dev);
 }

 static inline void spmi_set_ctrldata(struct spmi_controller *ctrl, void *data)
 {
 	dev_set_drvdata(&ctrl->dev, data);
 }

 static inline void *spmi_get_devicedata(const struct spmi_device *dev)
 {
 	return dev_get_drvdata(&dev->dev);
 }

 static inline void spmi_set_devicedata(struct spmi_device *dev, void *data)
 {
 	dev_set_drvdata(&dev->dev, data);
 }

 static inline void spmi_dev_put(struct spmi_device *spmidev)
 {
 	if (spmidev)
 		put_device(&spmidev->dev);
 }

 /**
  * spmi_register_read() - register read
  * @ctrl: SPMI controller.
  * @sid: slave identifier.
  * @ad: slave register address (5-bit address).
  * @buf: buffer to be populated with data from the Slave.
  *
  * Reads 1 byte of data from a Slave device register.
  */
 extern int spmi_register_read(struct spmi_controller *ctrl,
 					u8 sid, u8 ad, u8 *buf);

 /**
  * spmi_ext_register_read() - extended register read
  * @ctrl: SPMI controller.
  * @sid: slave identifier.
  * @ad: slave register address (8-bit address).
  * @len: the request number of bytes to read (up to 16 bytes).
  * @buf: buffer to be populated with data from the Slave.
  *
  * Reads up to 16 bytes of data from the extended register space on a
  * Slave device.
  */
 extern int spmi_ext_register_read(struct spmi_controller *ctrl,
 					u8 sid, u8 ad, u8 *buf, int len);

 /**
  * spmi_ext_register_readl() - extended register read long
  * @ctrl: SPMI controller.
  * @sid: slave identifier.
  * @ad: slave register address (16-bit address).
  * @len: the request number of bytes to read (up to 8 bytes).
  * @buf: buffer to be populated with data from the Slave.
  *
  * Reads up to 8 bytes of data from the extended register space on a
  * Slave device using 16-bit address.
  */
 extern int spmi_ext_register_readl(struct spmi_controller *ctrl,
 					u8 sid, u16 ad, u8 *buf, int len);

 /**
  * spmi_register_write() - register write
  * @ctrl: SPMI controller.
  * @sid: slave identifier.
  * @ad: slave register address (5-bit address).
  * @buf: buffer containing the data to be transferred to the Slave.
  *
  * Writes 1 byte of data to a Slave device register.
  */
 extern int spmi_register_write(struct spmi_controller *ctrl,
 					u8 sid, u8 ad, u8 *buf);

 /**
  * spmi_register_zero_write() - register zero write
  * @ctrl: SPMI controller.
  * @sid: slave identifier.
  * @data: the data to be written to register 0 (7-bits).
  *
  * Writes data to register 0 of the Slave device.
  */
 extern int spmi_register_zero_write(struct spmi_controller *ctrl,
 					u8 sid, u8 data);

 /**
  * spmi_ext_register_write() - extended register write
  * @ctrl: SPMI controller.
  * @sid: slave identifier.
  * @ad: slave register address (8-bit address).
  * @buf: buffer containing the data to be transferred to the Slave.
  * @len: the request number of bytes to read (up to 16 bytes).
  *
  * Writes up to 16 bytes of data to the extended register space of a
  * Slave device.
  */
 extern int spmi_ext_register_write(struct spmi_controller *ctrl,
 					u8 sid, u8 ad, u8 *buf, int len);

 /**
  * spmi_ext_register_writel() - extended register write long
  * @ctrl: SPMI controller.
  * @sid: slave identifier.
  * @ad: slave register address (16-bit address).
  * @buf: buffer containing the data to be transferred to the Slave.
  * @len: the request number of bytes to read (up to 8 bytes).
  *
  * Writes up to 8 bytes of data to the extended register space of a
  * Slave device using 16-bit address.
  */
 extern int spmi_ext_register_writel(struct spmi_controller *ctrl,
 					u8 sid, u16 ad, u8 *buf, int len);

 /**
  * spmi_command_reset() - sends RESET command to the specified slave
  * @ctrl: SPMI controller.
  * @sid: slave identifier.
  *
  * The Reset command initializes the Slave and forces all registers to
  * their reset values. The Slave shall enter the STARTUP state after
  * receiving a Reset command.
  *
  * Returns
  * -EINVAL for invalid slave identifier.
  * -EPERM if the SPMI transaction is denied due to permission issues.
  * -EIO if the SPMI transaction fails (parity errors, etc).
  * -ETIMEDOUT if the SPMI transaction times out.
  */
 extern int spmi_command_reset(struct spmi_controller *ctrl, u8 sid);

 /**
  * spmi_command_sleep() - sends SLEEP command to the specified slave
  * @ctrl: SPMI controller.
  * @sid: slave identifier.
  *
  * The Sleep command causes the Slave to enter the user defined SLEEP state.
  *
  * Returns
  * -EINVAL for invalid slave identifier.
  * -EPERM if the SPMI transaction is denied due to permission issues.
  * -EIO if the SPMI transaction fails (parity errors, etc).
  * -ETIMEDOUT if the SPMI transaction times out.
  */
 extern int spmi_command_sleep(struct spmi_controller *ctrl, u8 sid);

 /**
  * spmi_command_wakeup() - sends WAKEUP command to the specified slave
  * @ctrl: SPMI controller.
  * @sid: slave identifier.
  *
  * The Wakeup command causes the Slave to move from the SLEEP state to
  * the ACTIVE state.
  *
  * Returns
  * -EINVAL for invalid slave identifier.
  * -EPERM if the SPMI transaction is denied due to permission issues.
  * -EIO if the SPMI transaction fails (parity errors, etc).
  * -ETIMEDOUT if the SPMI transaction times out.
  */
 extern int spmi_command_wakeup(struct spmi_controller *ctrl, u8 sid);

 /**
  * spmi_command_shutdown() - sends SHUTDOWN command to the specified slave
  * @ctrl: SPMI controller.
  * @sid: slave identifier.
  *
  * The Shutdown command causes the Slave to enter the SHUTDOWN state.
  *
  * Returns
  * -EINVAL for invalid slave identifier.
  * -EPERM if the SPMI transaction is denied due to permission issues.
  * -EIO if the SPMI transaction fails (parity errors, etc).
  * -ETIMEDOUT if the SPMI transaction times out.
  */
 extern int spmi_command_shutdown(struct spmi_controller *ctrl, u8 sid);

 /**
  * spmi_for_each_container_dev - iterate over the array of devnode resources.
  * @res: spmi_resource pointer used as the array cursor
  * @spmi_dev: spmi_device to iterate
  *
  * Only useable in spmi-dev-container configurations.
  */
 #define spmi_for_each_container_dev(res, spmi_dev)			      \
 	for (res = ((spmi_dev)->dev_node ? &(spmi_dev)->dev_node[0] : NULL);  \
 	     (res - (spmi_dev)->dev_node) < (spmi_dev)->num_dev_node; res++)

 extern struct resource *spmi_get_resource(struct spmi_device *dev,
 				      struct spmi_resource *node,
 				      unsigned int type, unsigned int res_num);

 struct resource *spmi_get_resource_byname(struct spmi_device *dev,
 					  struct spmi_resource *node,
 					  unsigned int type,
 					  const char *name);

 extern int spmi_get_irq(struct spmi_device *dev, struct spmi_resource *node,
 						 unsigned int res_num);

 extern int spmi_get_irq_byname(struct spmi_device *dev,
 			       struct spmi_resource *node, const char *name);

 /**
  * spmi_get_node_name - return device name for spmi node
  * @dev: spmi device handle
  *
  * Get the primary node name of a spmi_device coresponding with
  * with the 'label' binding.
  *
  * Returns NULL if no primary dev name has been assigned to this spmi_device.
  */
 static inline const char *spmi_get_primary_dev_name(struct spmi_device *dev)
 {
 	if (dev->res.label)
 		return dev->res.label;
 	return NULL;
 }

 struct spmi_resource *spmi_get_dev_container_byname(struct spmi_device *dev,
 						    const char *label);
 #endif
	/* Copyright (c) 2012, The Linux Foundation. All rights reserved.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 and
	* only version 2 as published by the Free Software Foundation.
	*
	* This program is distributed in the hope that 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.
	*/

	#ifndef _LINUX_SPMI_H
	#define _LINUX_SPMI_H

	#include <linux/types.h>
	#include <linux/device.h>
	#include <linux/mod_devicetable.h>

	/* Maximum slave identifier */
	#define SPMI_MAX_SLAVE_ID 16

	/* SPMI Commands */
	enum spmi_commands {
	SPMI_CMD_EXT_WRITE = 0x00,
	SPMI_CMD_RESET = 0x10,
	SPMI_CMD_SLEEP = 0x11,
	SPMI_CMD_SHUTDOWN = 0x12,
	SPMI_CMD_WAKEUP = 0x13,
	SPMI_CMD_AUTHENTICATE = 0x14,
	SPMI_CMD_MSTR_READ = 0x15,
	SPMI_CMD_MSTR_WRITE = 0x16,
	SPMI_CMD_TRANSFER_BUS_OWNERSHIP = 0x1A,
	SPMI_CMD_DDB_MASTER_READ = 0x1B,
	SPMI_CMD_DDB_SLAVE_READ = 0x1C,
	SPMI_CMD_EXT_READ = 0x20,
	SPMI_CMD_EXT_WRITEL = 0x30,
	SPMI_CMD_EXT_READL = 0x38,
	SPMI_CMD_WRITE = 0x40,
	SPMI_CMD_READ = 0x60,
	SPMI_CMD_ZERO_WRITE = 0x80,
	};

	struct spmi_device;

	/**
	* struct spmi_controller: interface to the SPMI master controller
	* @nr: board-specific number identifier for this controller/bus
	* @name: name for this controller
	* @cmd: sends a non-data command sequence on the SPMI bus.
	* @read_cmd: sends a register read command sequence on the SPMI bus.
	* @write_cmd: sends a register write command sequence on the SPMI bus.
	*/
	struct spmi_controller {
	struct device dev;
	unsigned int nr;
	struct list_head list;
	int (cmd)(struct spmi_controller , u8 opcode, u8 sid);
	int (read_cmd)(struct spmi_controller ,
	u8 opcode, u8 sid, u16 addr, u8 bc, u8 *buf);
	int (write_cmd)(struct spmi_controller ,
	u8 opcode, u8 sid, u16 addr, u8 bc, u8 *buf);
	};
	#define to_spmi_controller(d) container_of(d, struct spmi_controller, dev)

	/**
	* struct spmi_driver: Manage SPMI generic/slave device driver
	* @probe: binds this driver to a SPMI device.
	* @remove: unbinds this driver from the SPMI device.
	* @shutdown: standard shutdown callback used during powerdown/halt.
	* @suspend: standard suspend callback used during system suspend
	* @resume: standard resume callback used during system resume
	* @driver: SPMI device drivers should initialize name and owner field of
	* this structure
	* @id_table: list of SPMI devices supported by this driver
	*/
	struct spmi_driver {
	int (probe)(struct spmi_device dev);
	int (remove)(struct spmi_device dev);
	void (shutdown)(struct spmi_device dev);
	int (suspend)(struct spmi_device dev,
	pm_message_t pmesg);
	int (resume)(struct spmi_device dev);

	struct device_driver driver;
	const struct spmi_device_id *id_table;
	};
	#define to_spmi_driver(d) container_of(d, struct spmi_driver, driver)

	/**
	* struct spmi_resource: spmi_resource for one device_node
	* @num_resources: number of resources for this device node
	* @resources: array of resources for this device_node
	* @of_node: device_node of the resource in question
	* @label: name used to reference the device from the driver
	*
	* Note that we explicitly add a 'label' pointer here since per
	* the ePAPR 2.2.2, the device_node->name should be generic and not
	* reflect precise programming model. Thus label enables a
	* platform specific name to be assigned with the 'label' binding to
	* allow for unique query names.
	*/
	struct spmi_resource {
	struct resource *resource;
	u32 num_resources;
	struct device_node *of_node;
	const char *label;
	};

	/**
	* Client/device handle (struct spmi_device):
	* ------------------------------------------
	* This is the client/device handle returned when a SPMI device
	* is registered with a controller.
	* Pointer to this structure is used by client-driver as a handle.
	* @dev: Driver model representation of the device.
	* @name: Name of driver to use with this device.
	* @ctrl: SPMI controller managing the bus hosting this device.
	* @res: SPMI resource for the primary node
	* @dev_node: array of SPMI resources when used with spmi-dev-container.
	* @num_dev_node: number of device_node structures.
	* @sid: Slave Identifier.
	*/
	struct spmi_device {
	struct device dev;
	const char *name;
	struct spmi_controller *ctrl;
	struct spmi_resource res;
	struct spmi_resource *dev_node;
	u32 num_dev_node;
	u8 sid;
	};
	#define to_spmi_device(d) container_of(d, struct spmi_device, dev)

	/**
	* struct spmi_boardinfo: Declare board info for SPMI device bringup.
	* @name: Name of driver to use with this device.
	* @slave_id: slave identifier.
	* @spmi_device: device to be registered with the SPMI framework.
	* @of_node: pointer to the OpenFirmware device node.
	* @res: SPMI resource for the primary node
	* @dev_node: array of SPMI resources when used with spmi-dev-container.
	* @num_dev_node: number of device_node structures.
	* @platform_data: goes to spmi_device.dev.platform_data
	*/
	struct spmi_boardinfo {
	char name[SPMI_NAME_SIZE];
	uint8_t slave_id;
	struct device_node *of_node;
	struct spmi_resource res;
	struct spmi_resource *dev_node;
	u32 num_dev_node;
	const void *platform_data;
	};

	/**
	* spmi_driver_register: Client driver registration with SPMI framework.
	* @drv: client driver to be associated with client-device.
	*
	* This API will register the client driver with the SPMI framework.
	* It is called from the driver's module-init function.
	*/
	extern int spmi_driver_register(struct spmi_driver *drv);

	/**
	* spmi_driver_unregister - reverse effect of spmi_driver_register
	* @sdrv: the driver to unregister
	* Context: can sleep
	*/
	static inline void spmi_driver_unregister(struct spmi_driver *sdrv)
	{
	if (sdrv)
	driver_unregister(&sdrv->driver);
	}

	/**
	* spmi_add_controller: Controller bring-up.
	* @ctrl: controller to be registered.
	*
	* A controller is registered with the framework using this API. ctrl->nr is the
	* desired number with which SPMI framework registers the controller.
	* Function will return -EBUSY if the number is in use.
	*/
	extern int spmi_add_controller(struct spmi_controller *ctrl);

	/**
	* spmi_del_controller: Controller tear-down.
	* Controller added with the above API is teared down using this API.
	*/
	extern int spmi_del_controller(struct spmi_controller *ctrl);

	/**
	* spmi_busnum_to_ctrl: Map bus number to controller
	* @busnum: bus number
	*
	* Returns controller device representing this bus number
	*/
	extern struct spmi_controller *spmi_busnum_to_ctrl(u32 bus_num);

	/**
	* spmi_alloc_device: Allocate a new SPMI devices.
	* @ctrl: controller to which this device is to be added to.
	* Context: can sleep
	*
	* Allows a driver to allocate and initialize a SPMI device without
	* registering it immediately. This allows a driver to directly fill
	* the spmi_device structure before calling spmi_add_device().
	*
	* Caller is responsible to call spmi_add_device() on the returned
	* spmi_device. If the caller needs to discard the spmi_device without
	* adding it, then spmi_dev_put() should be called.
	*/
	extern struct spmi_device spmi_alloc_device(struct spmi_controller ctrl);

	/**
	* spmi_add_device: Add spmi_device allocated with spmi_alloc_device().
	* @spmi_dev: spmi_device to be added (registered).
	*/
	extern int spmi_add_device(struct spmi_device *spmi_dev);

	/**
	* spmi_new_device: Instantiates a new SPMI device
	* @ctrl: controller to which this device is to be added to.
	* @info: board information for this device.
	*
	* Returns the new device or NULL.
	*/
	extern struct spmi_device spmi_new_device(struct spmi_controller ctrl,
	struct spmi_boardinfo const *info);

	/* spmi_remove_device: Remove the effect of spmi_add_device() */
	extern void spmi_remove_device(struct spmi_device *spmi_dev);

	#ifdef CONFIG_SPMI
	/**
	* spmi_register_board_info: Board-initialization routine.
	* @bus_num: controller number (bus) on which this device will sit.
	* @info: list of all devices on all controllers present on the board.
	* @n: number of entries.
	*
	* API enumerates respective devices on corresponding controller.
	* Called from board-init function.
	*/
	extern int spmi_register_board_info(int busnum,
	struct spmi_boardinfo const *info, unsigned n);
	#else
	static inline int spmi_register_board_info(int busnum,
	struct spmi_boardinfo const *info, unsigned n)
	{
	return 0;
	}
	#endif

	static inline void spmi_get_ctrldata(const struct spmi_controller ctrl)
	{
	return dev_get_drvdata(&ctrl->dev);
	}

	static inline void spmi_set_ctrldata(struct spmi_controller ctrl, void data)
	{
	dev_set_drvdata(&ctrl->dev, data);
	}

	static inline void spmi_get_devicedata(const struct spmi_device dev)
	{
	return dev_get_drvdata(&dev->dev);
	}

	static inline void spmi_set_devicedata(struct spmi_device dev, void data)
	{
	dev_set_drvdata(&dev->dev, data);
	}

	static inline void spmi_dev_put(struct spmi_device *spmidev)
	{
	if (spmidev)
	put_device(&spmidev->dev);
	}

	/**
	* spmi_register_read() - register read
	* @ctrl: SPMI controller.
	* @sid: slave identifier.
	* @ad: slave register address (5-bit address).
	* @buf: buffer to be populated with data from the Slave.
	*
	* Reads 1 byte of data from a Slave device register.
	*/
	extern int spmi_register_read(struct spmi_controller *ctrl,
	u8 sid, u8 ad, u8 *buf);

	/**
	* spmi_ext_register_read() - extended register read
	* @ctrl: SPMI controller.
	* @sid: slave identifier.
	* @ad: slave register address (8-bit address).
	* @len: the request number of bytes to read (up to 16 bytes).
	* @buf: buffer to be populated with data from the Slave.
	*
	* Reads up to 16 bytes of data from the extended register space on a
	* Slave device.
	*/
	extern int spmi_ext_register_read(struct spmi_controller *ctrl,
	u8 sid, u8 ad, u8 *buf, int len);

	/**
	* spmi_ext_register_readl() - extended register read long
	* @ctrl: SPMI controller.
	* @sid: slave identifier.
	* @ad: slave register address (16-bit address).
	* @len: the request number of bytes to read (up to 8 bytes).
	* @buf: buffer to be populated with data from the Slave.
	*
	* Reads up to 8 bytes of data from the extended register space on a
	* Slave device using 16-bit address.
	*/
	extern int spmi_ext_register_readl(struct spmi_controller *ctrl,
	u8 sid, u16 ad, u8 *buf, int len);

	/**
	* spmi_register_write() - register write
	* @ctrl: SPMI controller.
	* @sid: slave identifier.
	* @ad: slave register address (5-bit address).
	* @buf: buffer containing the data to be transferred to the Slave.
	*
	* Writes 1 byte of data to a Slave device register.
	*/
	extern int spmi_register_write(struct spmi_controller *ctrl,
	u8 sid, u8 ad, u8 *buf);

	/**
	* spmi_register_zero_write() - register zero write
	* @ctrl: SPMI controller.
	* @sid: slave identifier.
	* @data: the data to be written to register 0 (7-bits).
	*
	* Writes data to register 0 of the Slave device.
	*/
	extern int spmi_register_zero_write(struct spmi_controller *ctrl,
	u8 sid, u8 data);

	/**
	* spmi_ext_register_write() - extended register write
	* @ctrl: SPMI controller.
	* @sid: slave identifier.
	* @ad: slave register address (8-bit address).
	* @buf: buffer containing the data to be transferred to the Slave.
	* @len: the request number of bytes to read (up to 16 bytes).
	*
	* Writes up to 16 bytes of data to the extended register space of a
	* Slave device.
	*/
	extern int spmi_ext_register_write(struct spmi_controller *ctrl,
	u8 sid, u8 ad, u8 *buf, int len);

	/**
	* spmi_ext_register_writel() - extended register write long
	* @ctrl: SPMI controller.
	* @sid: slave identifier.
	* @ad: slave register address (16-bit address).
	* @buf: buffer containing the data to be transferred to the Slave.
	* @len: the request number of bytes to read (up to 8 bytes).
	*
	* Writes up to 8 bytes of data to the extended register space of a
	* Slave device using 16-bit address.
	*/
	extern int spmi_ext_register_writel(struct spmi_controller *ctrl,
	u8 sid, u16 ad, u8 *buf, int len);

	/**
	* spmi_command_reset() - sends RESET command to the specified slave
	* @ctrl: SPMI controller.
	* @sid: slave identifier.
	*
	* The Reset command initializes the Slave and forces all registers to
	* their reset values. The Slave shall enter the STARTUP state after
	* receiving a Reset command.
	*
	* Returns
	* -EINVAL for invalid slave identifier.
	* -EPERM if the SPMI transaction is denied due to permission issues.
	* -EIO if the SPMI transaction fails (parity errors, etc).
	* -ETIMEDOUT if the SPMI transaction times out.
	*/
	extern int spmi_command_reset(struct spmi_controller *ctrl, u8 sid);

	/**
	* spmi_command_sleep() - sends SLEEP command to the specified slave
	* @ctrl: SPMI controller.
	* @sid: slave identifier.
	*
	* The Sleep command causes the Slave to enter the user defined SLEEP state.
	*
	* Returns
	* -EINVAL for invalid slave identifier.
	* -EPERM if the SPMI transaction is denied due to permission issues.
	* -EIO if the SPMI transaction fails (parity errors, etc).
	* -ETIMEDOUT if the SPMI transaction times out.
	*/
	extern int spmi_command_sleep(struct spmi_controller *ctrl, u8 sid);

	/**
	* spmi_command_wakeup() - sends WAKEUP command to the specified slave
	* @ctrl: SPMI controller.
	* @sid: slave identifier.
	*
	* The Wakeup command causes the Slave to move from the SLEEP state to
	* the ACTIVE state.
	*
	* Returns
	* -EINVAL for invalid slave identifier.
	* -EPERM if the SPMI transaction is denied due to permission issues.
	* -EIO if the SPMI transaction fails (parity errors, etc).
	* -ETIMEDOUT if the SPMI transaction times out.
	*/
	extern int spmi_command_wakeup(struct spmi_controller *ctrl, u8 sid);

	/**
	* spmi_command_shutdown() - sends SHUTDOWN command to the specified slave
	* @ctrl: SPMI controller.
	* @sid: slave identifier.
	*
	* The Shutdown command causes the Slave to enter the SHUTDOWN state.
	*
	* Returns
	* -EINVAL for invalid slave identifier.
	* -EPERM if the SPMI transaction is denied due to permission issues.
	* -EIO if the SPMI transaction fails (parity errors, etc).
	* -ETIMEDOUT if the SPMI transaction times out.
	*/
	extern int spmi_command_shutdown(struct spmi_controller *ctrl, u8 sid);

	/**
	* spmi_for_each_container_dev - iterate over the array of devnode resources.
	* @res: spmi_resource pointer used as the array cursor
	* @spmi_dev: spmi_device to iterate
	*
	* Only useable in spmi-dev-container configurations.
	*/
	#define spmi_for_each_container_dev(res, spmi_dev) \
	for (res = ((spmi_dev)->dev_node ? &(spmi_dev)->dev_node[0] : NULL); \
	(res - (spmi_dev)->dev_node) < (spmi_dev)->num_dev_node; res++)

	extern struct resource spmi_get_resource(struct spmi_device dev,
	struct spmi_resource *node,
	unsigned int type, unsigned int res_num);

	struct resource spmi_get_resource_byname(struct spmi_device dev,
	struct spmi_resource *node,
	unsigned int type,
	const char *name);

	extern int spmi_get_irq(struct spmi_device dev, struct spmi_resource node,
	unsigned int res_num);

	extern int spmi_get_irq_byname(struct spmi_device *dev,
	struct spmi_resource node, const char name);

	/**
	* spmi_get_node_name - return device name for spmi node
	* @dev: spmi device handle
	*
	* Get the primary node name of a spmi_device coresponding with
	* with the 'label' binding.
	*
	* Returns NULL if no primary dev name has been assigned to this spmi_device.
	*/
	static inline const char spmi_get_primary_dev_name(struct spmi_device dev)
	{
	if (dev->res.label)
	return dev->res.label;
	return NULL;
	}

	struct spmi_resource spmi_get_dev_container_byname(struct spmi_device dev,
	const char *label);
	#endif