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    Subject[PATCH v3 3/8] rsb: Linux driver framework for Reduced Serial Bus (RSB)
    Date
    Reduced Serial Bus (RSB) is an Allwinner proprietery interface
    used to communicate with PMICs and other peripheral ICs.

    RSB is a two-wire push-pull serial bus that supports 1 master
    device and up to 15 active slave devices.

    Signed-off-by: Chen-Yu Tsai <wens@csie.org>
    ---
    drivers/Kconfig | 2 +
    drivers/Makefile | 1 +
    drivers/rsb/Kconfig | 11 ++
    drivers/rsb/Makefile | 4 +
    drivers/rsb/rsb-core.c | 511 +++++++++++++++++++++++++++++++++++++++++++++++++
    include/linux/rsb.h | 144 ++++++++++++++
    6 files changed, 673 insertions(+)
    create mode 100644 drivers/rsb/Kconfig
    create mode 100644 drivers/rsb/Makefile
    create mode 100644 drivers/rsb/rsb-core.c
    create mode 100644 include/linux/rsb.h

    diff --git a/drivers/Kconfig b/drivers/Kconfig
    index 6e973b8e3a3b..4ada2d3eb832 100644
    --- a/drivers/Kconfig
    +++ b/drivers/Kconfig
    @@ -54,6 +54,8 @@ source "drivers/spi/Kconfig"

    source "drivers/spmi/Kconfig"

    +source "drivers/rsb/Kconfig"
    +
    source "drivers/hsi/Kconfig"

    source "drivers/pps/Kconfig"
    diff --git a/drivers/Makefile b/drivers/Makefile
    index e4b260ecec15..75e0fc8fe28c 100644
    --- a/drivers/Makefile
    +++ b/drivers/Makefile
    @@ -75,6 +75,7 @@ obj-$(CONFIG_TARGET_CORE) += target/
    obj-$(CONFIG_MTD) += mtd/
    obj-$(CONFIG_SPI) += spi/
    obj-$(CONFIG_SPMI) += spmi/
    +obj-$(CONFIG_RSB) += rsb/
    obj-y += hsi/
    obj-y += net/
    obj-$(CONFIG_ATM) += atm/
    diff --git a/drivers/rsb/Kconfig b/drivers/rsb/Kconfig
    new file mode 100644
    index 000000000000..6642e1db6d98
    --- /dev/null
    +++ b/drivers/rsb/Kconfig
    @@ -0,0 +1,11 @@
    +#
    +# RSB driver configuration
    +#
    +menuconfig RSB
    + tristate "RSB support"
    + help
    + RSB (Reduced Serial Bus) is a two-wire serial interface between
    + baseband and application processors and Power Management
    + Integrated Circuits (PMIC) or other peripherals.
    +
    + These are commonly seen on newer Allwinner SoCs and X-Powers ICs.
    diff --git a/drivers/rsb/Makefile b/drivers/rsb/Makefile
    new file mode 100644
    index 000000000000..6fe56526fbf3
    --- /dev/null
    +++ b/drivers/rsb/Makefile
    @@ -0,0 +1,4 @@
    +#
    +# Makefile for kernel RSB framework.
    +#
    +obj-$(CONFIG_RSB) += rsb-core.o
    diff --git a/drivers/rsb/rsb-core.c b/drivers/rsb/rsb-core.c
    new file mode 100644
    index 000000000000..6682d827aebb
    --- /dev/null
    +++ b/drivers/rsb/rsb-core.c
    @@ -0,0 +1,511 @@
    +/*
    + * Copyright (c) 2015, Chen-Yu Tsai
    + *
    + * Chen-Yu Tsai <wens@csie.org>
    + *
    + * Allwinner Reduced Serial Bus (RSB) driver
    + *
    + * based on spmi/spmi.c
    + *
    + * Copyright (c) 2012-2015, 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.
    + */
    +
    +#include <linux/clk/clk-conf.h>
    +#include <linux/kernel.h>
    +#include <linux/errno.h>
    +#include <linux/idr.h>
    +#include <linux/module.h>
    +#include <linux/of.h>
    +#include <linux/of_device.h>
    +#include <linux/of_irq.h>
    +#include <linux/platform_device.h>
    +#include <linux/rsb.h>
    +#include <linux/slab.h>
    +
    +static DEFINE_IDA(ctrl_ida);
    +
    +static void rsb_dev_release(struct device *dev)
    +{
    + struct rsb_device *rdev = to_rsb_device(dev);
    +
    + kfree(rdev);
    +}
    +
    +static const struct device_type rsb_dev_type = {
    + .release = rsb_dev_release,
    +};
    +
    +static void rsb_ctrl_release(struct device *dev)
    +{
    + struct rsb_controller *ctrl = to_rsb_controller(dev);
    +
    + ida_simple_remove(&ctrl_ida, ctrl->nr);
    + kfree(ctrl);
    +}
    +
    +static const struct device_type rsb_ctrl_type = {
    + .release = rsb_ctrl_release,
    +};
    +
    +static int rsb_device_match(struct device *dev, struct device_driver *drv)
    +{
    + if (of_driver_match_device(dev, drv))
    + return 1;
    +
    + return strcmp(dev_name(dev), drv->name) == 0;
    +}
    +
    +static inline int rsb_init_cmd(struct rsb_controller *ctrl)
    +{
    + int ret;
    +
    + if (!ctrl || !ctrl->init_cmd || ctrl->dev.type != &rsb_ctrl_type)
    + return -EINVAL;
    +
    + mutex_lock(&ctrl->lock);
    + ret = ctrl->init_cmd(ctrl);
    + mutex_unlock(&ctrl->lock);
    +
    + return ret;
    +}
    +
    +static inline int rsb_rtsaddr_cmd(struct rsb_controller *ctrl, u16 hwaddr,
    + u8 rtaddr)
    +{
    + int ret;
    +
    + if (!ctrl || !ctrl->rtsaddr_cmd || ctrl->dev.type != &rsb_ctrl_type)
    + return -EINVAL;
    +
    + mutex_lock(&ctrl->lock);
    + ret = ctrl->rtsaddr_cmd(ctrl, hwaddr, rtaddr);
    + mutex_unlock(&ctrl->lock);
    +
    + return ret;
    +}
    +
    +static inline int rsb_read_cmd(struct rsb_controller *ctrl, u8 rtaddr,
    + u8 addr, u32 *buf, size_t len)
    +{
    + int ret;
    +
    + if (!ctrl || !ctrl->read_cmd || ctrl->dev.type != &rsb_ctrl_type)
    + return -EINVAL;
    +
    + mutex_lock(&ctrl->lock);
    + ret = ctrl->read_cmd(ctrl, rtaddr, addr, buf, len);
    + mutex_unlock(&ctrl->lock);
    +
    + return ret;
    +}
    +
    +static inline int rsb_write_cmd(struct rsb_controller *ctrl, u8 rtaddr,
    + u8 addr, const u32 *buf, size_t len)
    +{
    + int ret;
    +
    + if (!ctrl || !ctrl->write_cmd || ctrl->dev.type != &rsb_ctrl_type)
    + return -EINVAL;
    +
    + mutex_lock(&ctrl->lock);
    + ret = ctrl->write_cmd(ctrl, rtaddr, addr, buf, len);
    + mutex_unlock(&ctrl->lock);
    +
    + return ret;
    +}
    +
    +/**
    + * rsb_register_read() - register read
    + * @rdev: RSB device.
    + * @addr: slave register address.
    + * @buf: buffer to be populated with data from the Slave.
    + * @size: width of the slave register in bytes
    + *
    + * Reads data from a Slave device register.
    + */
    +int rsb_register_read(struct rsb_device *rdev, u8 addr, u32 *buf, int size)
    +{
    + switch (size) {
    + case 1:
    + case 2:
    + case 4:
    + break;
    + default:
    + return -EINVAL;
    + }
    +
    + return rsb_read_cmd(rdev->ctrl, rdev->rtaddr, addr, buf, size);
    +}
    +EXPORT_SYMBOL_GPL(rsb_register_read);
    +
    +/**
    + * rsb_register_write() - register write
    + * @rdev: RSB device
    + * @addr: slave register address.
    + * @data: buffer containing the data to be transferred to the Slave.
    + * @size: width of the slave register in bytes
    + *
    + * Writes data to a Slave device register.
    + */
    +int rsb_register_write(struct rsb_device *rdev, u8 addr, u32 data, int size)
    +{
    + switch (size) {
    + case 1:
    + case 2:
    + case 4:
    + break;
    + default:
    + return -EINVAL;
    + }
    +
    + return rsb_write_cmd(rdev->ctrl, rdev->rtaddr, addr, &data, size);
    +}
    +EXPORT_SYMBOL_GPL(rsb_register_write);
    +
    +static struct bus_type rsb_bus_type;
    +
    +static int rsb_device_probe(struct device *dev)
    +{
    + const struct rsb_driver *drv = to_rsb_driver(dev->driver);
    + struct rsb_device *rsb = to_rsb_device(dev);
    + int ret;
    +
    + if (dev->type != &rsb_dev_type)
    + return 0;
    +
    + if (!drv->probe)
    + return -ENODEV;
    +
    + if (!rsb->irq) {
    + int irq = -ENOENT;
    +
    + if (dev->of_node)
    + irq = of_irq_get(dev->of_node, 0);
    +
    + if (irq == -EPROBE_DEFER)
    + return irq;
    + if (irq < 0)
    + irq = 0;
    +
    + rsb->irq = irq;
    + }
    +
    + ret = of_clk_set_defaults(dev->of_node, false);
    + if (ret < 0)
    + return ret;
    +
    + return drv->probe(rsb);
    +}
    +
    +static int rsb_device_remove(struct device *dev)
    +{
    + const struct rsb_driver *drv = to_rsb_driver(dev->driver);
    +
    + if (dev->type != &rsb_dev_type)
    + return 0;
    +
    + return drv->remove(to_rsb_device(dev));
    +}
    +
    +static struct bus_type rsb_bus_type = {
    + .name = "rsb",
    + .match = rsb_device_match,
    + .probe = rsb_device_probe,
    + .remove = rsb_device_remove,
    +};
    +
    +/**
    + * rsb_device_alloc() - Allocate a new RSB device
    + * @ctrl: associated controller
    + *
    + * Caller is responsible for either calling rsb_device_add() to add the
    + * newly allocated controller, or calling rsb_device_put() to discard it.
    + */
    +static struct rsb_device *rsb_device_alloc(struct rsb_controller *ctrl)
    +{
    + struct rsb_device *rdev;
    +
    + rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
    + if (!rdev)
    + return NULL;
    +
    + rdev->ctrl = ctrl;
    + device_initialize(&rdev->dev);
    + rdev->dev.parent = &ctrl->dev;
    + rdev->dev.bus = &rsb_bus_type;
    + rdev->dev.type = &rsb_dev_type;
    + return rdev;
    +}
    +
    +static inline void rsb_device_put(struct rsb_device *rdev)
    +{
    + if (rdev)
    + put_device(&rdev->dev);
    +}
    +
    +/* 15 valid runtime addresses for RSB slaves */
    +static const u8 rsb_valid_rtaddr[] = {
    + 0x17, 0x2d, 0x3a, 0x4e, 0x59, 0x63, 0x74, 0x8b,
    + 0x9c, 0xa6, 0xb1, 0xc5, 0xd2, 0xe8, 0xff,
    +};
    +
    +static inline int rsb_check_rt_addr(u8 addr)
    +{
    + int i;
    +
    + for (i = 0; i < ARRAY_SIZE(rsb_valid_rtaddr); i++)
    + if (addr == rsb_valid_rtaddr[i])
    + return 0;
    +
    + return -EINVAL;
    +}
    +
    +/**
    + * rsb_device_add() - add a device previously constructed via rsb_device_alloc()
    + * @rdev: rsb_device to be added
    + */
    +static int rsb_device_add(struct rsb_device *rdev)
    +{
    + struct rsb_controller *ctrl = rdev->ctrl;
    + int err;
    +
    + dev_set_name(&rdev->dev, "%d-%02x", ctrl->nr, rdev->rtaddr);
    +
    + err = device_add(&rdev->dev);
    + if (err < 0) {
    + dev_err(&rdev->dev, "Can't add %s, status %d\n",
    + dev_name(&rdev->dev), err);
    + goto err_device_add;
    + }
    +
    + dev_dbg(&rdev->dev, "device %s registered\n", dev_name(&rdev->dev));
    +
    +err_device_add:
    + return err;
    +}
    +
    +/**
    + * rsb_device_unregister(): unregister an RSB device
    + * @rdev: rsb_device to be removed
    + */
    +static void rsb_device_unregister(struct rsb_device *rdev)
    +{
    + device_unregister(&rdev->dev);
    +}
    +
    +/**
    + * rsb_controller_alloc() - Allocate a new RSB controller
    + * @parent: parent device
    + * @size: size of private data
    + *
    + * Caller is responsible for either calling rsb_controller_add() to add the
    + * newly allocated controller, or calling rsb_controller_put() to discard it.
    + * The allocated private data region may be accessed via
    + * rsb_controller_get_drvdata()
    + */
    +struct rsb_controller *rsb_controller_alloc(struct device *parent, size_t size)
    +{
    + struct rsb_controller *ctrl;
    + int id;
    +
    + if (WARN_ON(!parent))
    + return NULL;
    +
    + ctrl = kzalloc(sizeof(*ctrl) + size, GFP_KERNEL);
    + if (!ctrl)
    + return NULL;
    +
    + device_initialize(&ctrl->dev);
    + mutex_init(&ctrl->lock);
    + ctrl->dev.type = &rsb_ctrl_type;
    + ctrl->dev.bus = &rsb_bus_type;
    + ctrl->dev.parent = parent;
    + ctrl->dev.of_node = parent->of_node;
    + rsb_controller_set_drvdata(ctrl, &ctrl[1]);
    +
    + id = ida_simple_get(&ctrl_ida, 0, 0, GFP_KERNEL);
    + if (id < 0) {
    + dev_err(parent,
    + "unable to allocate RSB controller identifier.\n");
    + rsb_controller_put(ctrl);
    + return NULL;
    + }
    +
    + ctrl->nr = id;
    + dev_set_name(&ctrl->dev, "rsb-%d", id);
    + dev_dbg(&ctrl->dev, "allocated controller 0x%p id %d\n", ctrl, id);
    +
    + return ctrl;
    +}
    +EXPORT_SYMBOL_GPL(rsb_controller_alloc);
    +
    +static void of_rsb_register_devices(struct rsb_controller *ctrl)
    +{
    + struct device_node *node;
    + int err;
    + u32 reg[2];
    +
    + if (!ctrl->dev.of_node)
    + return;
    +
    + /* Runtime addresses for all slaves should be set first */
    + for_each_available_child_of_node(ctrl->dev.of_node, node) {
    + dev_dbg(&ctrl->dev, "setting child %s runtime address\n",
    + node->full_name);
    +
    + err = of_property_read_u32_array(node, "reg", reg, 2);
    + if (err) {
    + dev_err(&ctrl->dev,
    + "node %s err (%d) does not have 'reg' property\n",
    + node->full_name, err);
    + continue;
    + }
    +
    + if (reg[0] > 0xff || rsb_check_rt_addr(reg[0]) < 0) {
    + dev_err(&ctrl->dev,
    + "invalid runtime address on node %s\n",
    + node->full_name);
    + continue;
    + }
    +
    + /* This fails if the slave device was already initialized */
    + err = rsb_rtsaddr_cmd(ctrl, (u16)reg[1], (u8)reg[0]);
    + if (err)
    + dev_info(&ctrl->dev,
    + "failed to set runtime address: %d\n", err);
    + }
    +
    + for_each_available_child_of_node(ctrl->dev.of_node, node) {
    + struct rsb_device *rdev;
    +
    + dev_dbg(&ctrl->dev, "adding child %s\n", node->full_name);
    +
    + err = of_property_read_u32_array(node, "reg", reg, 2);
    + if (err)
    + continue;
    +
    + if (reg[0] > 0xff || rsb_check_rt_addr(reg[0]) < 0)
    + continue;
    +
    + rdev = rsb_device_alloc(ctrl);
    + if (!rdev)
    + continue;
    +
    + rdev->dev.of_node = node;
    + rdev->rtaddr = (u8)reg[0];
    + rdev->hwaddr = (u16)reg[1];
    +
    + err = rsb_device_add(rdev);
    + if (err) {
    + dev_err(&rdev->dev, "failed to add device: %d\n", err);
    + rsb_device_put(rdev);
    + }
    + }
    +}
    +
    +/**
    + * rsb_controller_add() - Add an RSB controller
    + * @ctrl: controller to be registered.
    + *
    + * Register a controller previously allocated via rsb_controller_alloc() with
    + * the RSB core.
    + */
    +int rsb_controller_add(struct rsb_controller *ctrl)
    +{
    + int ret;
    +
    + /* Can't register until after driver model init */
    + if (WARN_ON(!rsb_bus_type.p))
    + return -EAGAIN;
    +
    + ret = device_add(&ctrl->dev);
    + if (ret)
    + return ret;
    +
    + /*
    + * Send RSB init sequence on the bus. This fails if the bus was
    + * already initialized.
    + */
    + ret = rsb_init_cmd(ctrl);
    + if (ret)
    + dev_info(&ctrl->dev, "RSB init sequence failed: %d\n", ret);
    +
    + if (IS_ENABLED(CONFIG_OF))
    + of_rsb_register_devices(ctrl);
    +
    + dev_dbg(&ctrl->dev, "rsb-%d registered: dev:%p\n",
    + ctrl->nr, &ctrl->dev);
    +
    + return 0;
    +};
    +EXPORT_SYMBOL_GPL(rsb_controller_add);
    +
    +/* Remove a device associated with a controller */
    +static int rsb_ctrl_remove_device(struct device *dev, void *data)
    +{
    + struct rsb_device *rsb = to_rsb_device(dev);
    +
    + if (dev->type == &rsb_dev_type)
    + rsb_device_unregister(rsb);
    + return 0;
    +}
    +
    +/**
    + * rsb_controller_remove(): remove an RSB controller
    + * @ctrl: controller to remove
    + *
    + * Remove a RSB controller. Caller is responsible for calling
    + * rsb_controller_put() to discard the allocated controller.
    + */
    +void rsb_controller_remove(struct rsb_controller *ctrl)
    +{
    + int dummy;
    +
    + if (!ctrl)
    + return;
    +
    + dummy = device_for_each_child(&ctrl->dev, NULL,
    + rsb_ctrl_remove_device);
    + mutex_destroy(&ctrl->lock);
    + device_del(&ctrl->dev);
    +}
    +EXPORT_SYMBOL_GPL(rsb_controller_remove);
    +
    +/**
    + * rsb_driver_register() - Register device driver with RSB core
    + * @rdrv: device driver to be associated with slave-device.
    + *
    + * This API will register the client driver with the RSB framework.
    + * It is typically called from the driver's module-init function.
    + */
    +int rsb_driver_register(struct rsb_driver *rdrv)
    +{
    + rdrv->driver.bus = &rsb_bus_type;
    + return driver_register(&rdrv->driver);
    +}
    +EXPORT_SYMBOL_GPL(rsb_driver_register);
    +
    +static void __exit rsb_exit(void)
    +{
    + bus_unregister(&rsb_bus_type);
    +}
    +module_exit(rsb_exit);
    +
    +static int __init rsb_init(void)
    +{
    + return bus_register(&rsb_bus_type);
    +}
    +postcore_initcall(rsb_init);
    +
    +MODULE_LICENSE("GPL v2");
    +MODULE_DESCRIPTION("Reduce Serial Bus (RSB) core module");
    +MODULE_ALIAS("platform:rsb");
    diff --git a/include/linux/rsb.h b/include/linux/rsb.h
    new file mode 100644
    index 000000000000..51a53468f547
    --- /dev/null
    +++ b/include/linux/rsb.h
    @@ -0,0 +1,144 @@
    +/* Copyright (c) 2012-2013, 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_RSB_H
    +#define _LINUX_RSB_H
    +
    +#include <linux/device.h>
    +#include <linux/mod_devicetable.h>
    +#include <linux/mutex.h>
    +#include <linux/types.h>
    +
    +/**
    + * struct rsb_device - Basic representation of an RSB device
    + * @dev: Driver model representation of the device.
    + * @ctrl: RSB controller managing the bus hosting this device.
    + * @rtaddr: This device's runtime address
    + * @hwaddr: This device's hardware address
    + */
    +struct rsb_device {
    + struct device dev;
    + struct rsb_controller *ctrl;
    + int irq;
    + u8 rtaddr;
    + u16 hwaddr;
    +};
    +
    +static inline struct rsb_device *to_rsb_device(struct device *d)
    +{
    + return container_of(d, struct rsb_device, dev);
    +}
    +
    +static inline void *rsb_device_get_drvdata(const struct rsb_device *rdev)
    +{
    + return dev_get_drvdata(&rdev->dev);
    +}
    +
    +static inline void rsb_device_set_drvdata(struct rsb_device *rdev, void *data)
    +{
    + dev_set_drvdata(&rdev->dev, data);
    +}
    +
    +/**
    + * struct rsb_controller - interface to the RSB master controller
    + * @dev: Driver model representation of the device.
    + * @nr: board-specific number identifier for this controller/bus
    + * @init_cmd: sends a device initialization command sequence on the bus.
    + * @rtsaddr_cmd: sends a "set runtime address" command sequence on the bus.
    + * @read_cmd: sends a register read command sequence on the RSB bus.
    + * @write_cmd: sends a register write command sequence on the RSB bus.
    + */
    +struct rsb_controller {
    + struct device dev;
    + unsigned int nr;
    + struct mutex lock; /* serialize access to the bus */
    + int (*init_cmd)(struct rsb_controller *ctrl);
    + int (*rtsaddr_cmd)(struct rsb_controller *ctrl,
    + u16 hwaddr, u8 rtaddr);
    + int (*read_cmd)(struct rsb_controller *ctrl, u8 rtaddr,
    + u8 addr, u32 *buf, size_t len);
    + int (*write_cmd)(struct rsb_controller *ctrl, u8 rtaddr,
    + u8 addr, const u32 *buf, size_t len);
    +};
    +
    +static inline struct rsb_controller *to_rsb_controller(struct device *d)
    +{
    + return container_of(d, struct rsb_controller, dev);
    +}
    +
    +static inline
    +void *rsb_controller_get_drvdata(const struct rsb_controller *ctrl)
    +{
    + return dev_get_drvdata(&ctrl->dev);
    +}
    +
    +static inline void rsb_controller_set_drvdata(struct rsb_controller *ctrl,
    + void *data)
    +{
    + dev_set_drvdata(&ctrl->dev, data);
    +}
    +
    +struct rsb_controller *rsb_controller_alloc(struct device *parent,
    + size_t size);
    +
    +/**
    + * rsb_controller_put() - decrement controller refcount
    + * @ctrl RSB controller.
    + */
    +static inline void rsb_controller_put(struct rsb_controller *ctrl)
    +{
    + if (ctrl) {
    + mutex_destroy(&ctrl->lock);
    + put_device(&ctrl->dev);
    + }
    +}
    +
    +int rsb_controller_add(struct rsb_controller *ctrl);
    +void rsb_controller_remove(struct rsb_controller *ctrl);
    +
    +/**
    + * struct rsb_driver - RSB slave device driver
    + * @driver: RSB device drivers should initialize name and owner field of
    + * this structure.
    + * @probe: binds this driver to a RSB device.
    + * @remove: unbinds this driver from the RSB device.
    + */
    +struct rsb_driver {
    + struct device_driver driver;
    + int (*probe)(struct rsb_device *rdev);
    + int (*remove)(struct rsb_device *rdev);
    +};
    +
    +static inline struct rsb_driver *to_rsb_driver(struct device_driver *d)
    +{
    + return container_of(d, struct rsb_driver, driver);
    +}
    +
    +int rsb_driver_register(struct rsb_driver *rdrv);
    +
    +/**
    + * rsb_driver_unregister() - unregister an RSB client driver
    + * @rdrv: the driver to unregister
    + */
    +static inline void rsb_driver_unregister(struct rsb_driver *rdrv)
    +{
    + if (rdrv)
    + driver_unregister(&rdrv->driver);
    +}
    +
    +#define module_rsb_driver(__rsb_driver) \
    + module_driver(__rsb_driver, rsb_driver_register, \
    + rsb_driver_unregister)
    +
    +int rsb_register_read(struct rsb_device *rdev, u8 addr, u32 *buf, int size);
    +int rsb_register_write(struct rsb_device *rdev, u8 addr, u32 data, int size);
    +
    +#endif
    --
    2.5.0


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