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Subject[PATCH RFC v2 1/4] siox: new driver framework for eckelmann SIOX
Date
---
drivers/Kconfig | 2 +
drivers/Makefile | 1 +
drivers/siox/Kconfig | 2 +
drivers/siox/Makefile | 1 +
drivers/siox/siox-core.c | 674 +++++++++++++++++++++++++++++++++++++++++++++++
drivers/siox/siox.h | 52 ++++
include/linux/siox.h | 61 +++++
7 files changed, 793 insertions(+)
create mode 100644 drivers/siox/Kconfig
create mode 100644 drivers/siox/Makefile
create mode 100644 drivers/siox/siox-core.c
create mode 100644 drivers/siox/siox.h
create mode 100644 include/linux/siox.h

diff --git a/drivers/Kconfig b/drivers/Kconfig
index 6e973b8e3a3b..c2fbf214f8a3 100644
--- a/drivers/Kconfig
+++ b/drivers/Kconfig
@@ -184,4 +184,6 @@ source "drivers/android/Kconfig"

source "drivers/nvdimm/Kconfig"

+source "drivers/siox/Kconfig"
+
endmenu
diff --git a/drivers/Makefile b/drivers/Makefile
index b64b49f6e01b..dd7b3cd1fd72 100644
--- a/drivers/Makefile
+++ b/drivers/Makefile
@@ -165,3 +165,4 @@ obj-$(CONFIG_RAS) += ras/
obj-$(CONFIG_THUNDERBOLT) += thunderbolt/
obj-$(CONFIG_CORESIGHT) += hwtracing/coresight/
obj-$(CONFIG_ANDROID) += android/
+obj-$(CONFIG_SIOX) += siox/
diff --git a/drivers/siox/Kconfig b/drivers/siox/Kconfig
new file mode 100644
index 000000000000..471fbc009521
--- /dev/null
+++ b/drivers/siox/Kconfig
@@ -0,0 +1,2 @@
+menuconfig SIOX
+ tristate "Eckelmann SIOX Support"
diff --git a/drivers/siox/Makefile b/drivers/siox/Makefile
new file mode 100644
index 000000000000..d55cb5e08868
--- /dev/null
+++ b/drivers/siox/Makefile
@@ -0,0 +1 @@
+obj-$(CONFIG_SIOX) += siox-core.o
diff --git a/drivers/siox/siox-core.c b/drivers/siox/siox-core.c
new file mode 100644
index 000000000000..b4a128218d7d
--- /dev/null
+++ b/drivers/siox/siox-core.c
@@ -0,0 +1,674 @@
+/*
+ * Copyright (C) 2015 Pengutronix, Uwe Kleine-König <kernel@pengutronix.de>
+ *
+ * This program is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License version 2 as published by the
+ * Free Software Foundation.
+ */
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/sysfs.h>
+
+#include "siox.h"
+
+struct workqueue_struct *wqueue;
+static bool siox_is_registered;
+
+void siox_master_lock(struct siox_master *smaster)
+{
+ mutex_lock(&smaster->lock);
+}
+
+void siox_master_unlock(struct siox_master *smaster)
+{
+ mutex_unlock(&smaster->lock);
+}
+
+struct siox_device *siox_device_add(struct siox_master *smaster);
+void siox_device_remove(struct siox_master *smaster);
+
+static void __siox_poll(struct siox_master *smaster)
+{
+ struct siox_device *sdevice;
+ size_t i = 0;
+ u8 prevstatus = smaster->status;
+
+ if (++smaster->status > 0x0d)
+ smaster->status = 0;
+
+ memset(smaster->buf, 0, smaster->setbuf_len);
+
+ list_for_each_entry_reverse(sdevice, &smaster->devices, node) {
+ struct siox_driver *sdriver =
+ sdevice->dev.driver ? to_siox_driver(sdevice->dev.driver) : NULL;
+
+ if (sdriver)
+ sdriver->set_data(sdevice, smaster->status,
+ &smaster->buf[i + 1]);
+
+ smaster->buf[i] = smaster->status;
+
+ i += sdevice->inbytes;
+ }
+
+ BUG_ON(i != smaster->setbuf_len);
+
+ smaster->pushpull(smaster, smaster->setbuf_len, smaster->buf,
+ smaster->getbuf_len,
+ smaster->buf + smaster->setbuf_len);
+
+ list_for_each_entry(sdevice, &smaster->devices, node) {
+ struct siox_driver *sdriver =
+ sdevice->dev.driver ? to_siox_driver(sdevice->dev.driver) : NULL;
+ u8 sdev_status = smaster->buf[i + sdevice->outbytes - 1];
+
+ /*
+ * bits 4:2 of status sample the respective bit in the status
+ * byte written in the previous cycle. Mask them out
+ * accordingly such that a set bit there indicates an error.
+ */
+ sdev_status ^= ~prevstatus & 0xe;
+
+ if ((sdevice->status ^ sdev_status) & 1)
+ sysfs_notify_dirent(sdevice->watchdog_kn);
+
+ if (!(sdev_status & 1)) {
+ sdevice->watchdog_errors++;
+ sysfs_notify_dirent(sdevice->watchdog_errors_kn);
+ }
+
+ if (sdev_status & 0xe) {
+ sdevice->status_errors++;
+ sysfs_notify_dirent(sdevice->status_errors_kn);
+ }
+
+ sdevice->status = sdev_status;
+
+ /*
+ * XXX trigger events for watchdog, changed jumper and misread
+ * counter. Should the bus stop to poll in these cases?
+ */
+
+ if (sdriver)
+ sdriver->get_data(sdevice, &smaster->buf[i]);
+
+ i += sdevice->outbytes;
+ }
+
+ if (smaster->active)
+ queue_delayed_work(wqueue, &smaster->poll,
+ smaster->poll_interval);
+}
+
+static void siox_poll(struct work_struct *work)
+{
+ struct delayed_work *dwork = to_delayed_work(work);
+ struct siox_master *smaster =
+ container_of(dwork, struct siox_master, poll);
+
+ get_device(&smaster->dev);
+ siox_master_lock(smaster);
+ if (likely(smaster->active))
+ __siox_poll(smaster);
+ siox_master_unlock(smaster);
+ put_device(&smaster->dev);
+}
+
+static int __siox_start(struct siox_master *smaster)
+{
+ if (!(smaster->setbuf_len + smaster->getbuf_len))
+ return -ENODEV;
+
+ if (!smaster->buf)
+ return -ENOMEM;
+
+ smaster->active = 1;
+
+ __siox_poll(smaster);
+
+ return 0;
+}
+
+static int siox_start(struct siox_master *smaster)
+{
+ int ret;
+
+ siox_master_lock(smaster);
+ ret = __siox_start(smaster);
+ siox_master_unlock(smaster);
+
+ return ret;
+}
+
+static int __siox_stop(struct siox_master *smaster)
+{
+ smaster->active = 0;
+ cancel_delayed_work(&smaster->poll);
+ return 0;
+}
+
+static int siox_stop(struct siox_master *smaster)
+{
+ int ret;
+
+ siox_master_lock(smaster);
+ ret = __siox_stop(smaster);
+ siox_master_unlock(smaster);
+
+ return ret;
+}
+
+static ssize_t type_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct siox_device *sdev = to_siox_device(dev);
+
+ return sprintf(buf, "%s\n", sdev->type);
+}
+
+static DEVICE_ATTR_RO(type);
+
+static ssize_t inbytes_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct siox_device *sdev = to_siox_device(dev);
+
+ return sprintf(buf, "%zu\n", sdev->inbytes);
+}
+
+static DEVICE_ATTR_RO(inbytes);
+
+static ssize_t outbytes_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct siox_device *sdev = to_siox_device(dev);
+
+ return sprintf(buf, "%zu\n", sdev->outbytes);
+}
+
+static DEVICE_ATTR_RO(outbytes);
+
+static ssize_t status_errors_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct siox_device *sdev = to_siox_device(dev);
+ unsigned status_errors;
+
+ siox_master_lock(sdev->smaster);
+
+ status_errors = sdev->status_errors;
+
+ siox_master_unlock(sdev->smaster);
+
+ return sprintf(buf, "%u\n", status_errors);
+}
+
+static DEVICE_ATTR_RO(status_errors);
+
+static ssize_t watchdog_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct siox_device *sdev = to_siox_device(dev);
+ u8 status;
+
+ siox_master_lock(sdev->smaster);
+
+ status = sdev->status;
+
+ siox_master_unlock(sdev->smaster);
+
+ return sprintf(buf, "%d\n", status & 1);
+}
+
+static DEVICE_ATTR_RO(watchdog);
+
+static ssize_t watchdog_errors_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct siox_device *sdev = to_siox_device(dev);
+ unsigned int watchdog_errors;
+
+ siox_master_lock(sdev->smaster);
+
+ watchdog_errors = sdev->watchdog_errors;
+
+ siox_master_unlock(sdev->smaster);
+
+ return sprintf(buf, "%u\n", watchdog_errors);
+}
+
+static DEVICE_ATTR_RO(watchdog_errors);
+
+static struct attribute *siox_device_attrs[] = {
+ &dev_attr_type.attr,
+ &dev_attr_inbytes.attr,
+ &dev_attr_outbytes.attr,
+ &dev_attr_status_errors.attr,
+ &dev_attr_watchdog.attr,
+ &dev_attr_watchdog_errors.attr,
+ NULL
+};
+ATTRIBUTE_GROUPS(siox_device);
+
+static void siox_device_release(struct device *dev)
+{
+ struct siox_device *sdevice = to_siox_device(dev);
+
+ kfree(sdevice);
+}
+
+static struct device_type siox_device_type = {
+ .groups = siox_device_groups,
+ .release = siox_device_release,
+};
+
+static int siox_match(struct device *dev, struct device_driver *drv)
+{
+ if (dev->type != &siox_device_type)
+ return 0;
+
+ /* up to now there is only a single driver so keeping this simple */
+ return 1;
+}
+
+static struct bus_type siox_bus_type = {
+ .name = "siox",
+ .match = siox_match,
+};
+
+static int siox_driver_probe(struct device *dev)
+{
+ struct siox_driver *sdriver = to_siox_driver(dev->driver);
+ struct siox_device *sdevice = to_siox_device(dev);
+ int ret;
+
+ ret = sdriver->probe(sdevice);
+ return ret;
+}
+
+static int siox_driver_remove(struct device *dev)
+{
+ struct siox_driver *sdriver =
+ container_of(dev->driver, struct siox_driver, driver);
+ struct siox_device *sdevice = to_siox_device(dev);
+ int ret;
+
+ ret = sdriver->remove(sdevice);
+ return ret;
+}
+
+static void siox_driver_shutdown(struct device *dev)
+{
+ struct siox_driver *sdriver =
+ container_of(dev->driver, struct siox_driver, driver);
+ struct siox_device *sdevice = to_siox_device(dev);
+
+ sdriver->shutdown(sdevice);
+}
+
+static ssize_t active_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct siox_master *smaster = to_siox_master(dev);
+
+ return sprintf(buf, "%d\n", smaster->active);
+}
+
+static ssize_t active_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct siox_master *smaster = to_siox_master(dev);
+ int ret;
+ int active;
+
+ ret = kstrtoint(buf, 0, &active);
+ if (ret < 0)
+ return ret;
+
+ if (!active == !smaster->active)
+ /* no change */
+ return count;
+
+ if (active)
+ ret = siox_start(smaster);
+ else
+ ret = siox_stop(smaster);
+
+ if (ret < 0)
+ return ret;
+
+ return count;
+}
+
+static DEVICE_ATTR_RW(active);
+
+static ssize_t device_add_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct siox_master *smaster = to_siox_master(dev);
+ int ret;
+ char type[20] = "";
+ size_t inbytes = 0, outbytes = 0;
+
+ ret = sscanf(buf, "%20s %zu %zu", type, &inbytes, &outbytes);
+ if (ret != 3 || strcmp(type, "siox-12x8") ||
+ inbytes != 2 || outbytes != 4)
+ return -EINVAL;
+
+ siox_device_add(smaster);
+
+ return count;
+}
+
+static DEVICE_ATTR_WO(device_add);
+
+static ssize_t device_remove_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct siox_master *smaster = to_siox_master(dev);
+
+ /* XXX? require to write <type> <inbytes> <outbytes> */
+ siox_device_remove(smaster);
+
+ return count;
+}
+
+static DEVICE_ATTR_WO(device_remove);
+
+static ssize_t poll_interval_ns_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct siox_master *smaster = to_siox_master(dev);
+
+ return sprintf(buf, "%lld\n", jiffies_to_nsecs(smaster->poll_interval));
+}
+
+static ssize_t poll_interval_ns_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct siox_master *smaster = to_siox_master(dev);
+ int ret;
+ u64 val;
+
+ siox_master_lock(smaster);
+
+ ret = kstrtou64(buf, 0, &val);
+ if (ret)
+ goto out_unlock;
+
+ smaster->poll_interval = nsecs_to_jiffies(val);
+
+out_unlock:
+ siox_master_unlock(smaster);
+
+ if (ret < 0)
+ return ret;
+
+ return count;
+}
+
+static DEVICE_ATTR_RW(poll_interval_ns);
+
+static struct attribute *siox_master_attrs[] = {
+ &dev_attr_active.attr,
+ &dev_attr_device_add.attr,
+ &dev_attr_device_remove.attr,
+ &dev_attr_poll_interval_ns.attr,
+ NULL
+};
+ATTRIBUTE_GROUPS(siox_master);
+
+static void siox_master_release(struct device *dev)
+{
+ struct siox_master *smaster = to_siox_master(dev);
+
+ kfree(smaster);
+}
+
+static struct device_type siox_master_type = {
+ .groups = siox_master_groups,
+ .release = siox_master_release,
+};
+
+struct siox_master *siox_master_alloc(struct device *dev,
+ size_t size)
+{
+ struct siox_master *smaster;
+
+ if (!dev)
+ return NULL;
+
+ smaster = kzalloc(sizeof(*smaster) + size, GFP_KERNEL);
+ if (!smaster)
+ return NULL;
+
+ device_initialize(&smaster->dev);
+
+ smaster->busno = -1;
+ smaster->dev.bus = &siox_bus_type;
+ smaster->dev.type = &siox_master_type;
+ smaster->dev.parent = dev;
+ smaster->poll_interval = DIV_ROUND_UP(HZ, 40);
+
+ dev_set_drvdata(&smaster->dev, &smaster[1]);
+
+ return smaster;
+}
+EXPORT_SYMBOL_GPL(siox_master_alloc);
+
+int siox_master_register(struct siox_master *smaster)
+{
+ if (!siox_is_registered)
+ return -EPROBE_DEFER;
+
+ if (!smaster->pushpull)
+ return -EINVAL;
+
+ dev_set_name(&smaster->dev, "siox-%d", smaster->busno);
+
+ mutex_init(&smaster->lock);
+ INIT_LIST_HEAD(&smaster->devices);
+ INIT_DELAYED_WORK(&smaster->poll, siox_poll);
+
+ return device_add(&smaster->dev);
+}
+EXPORT_SYMBOL_GPL(siox_master_register);
+
+void siox_master_unregister(struct siox_master *smaster)
+{
+ /* remove device */
+ device_del(&smaster->dev);
+
+ siox_master_lock(smaster);
+
+ __siox_stop(smaster);
+
+ while (smaster->num_devices) {
+ struct siox_device *sdevice;
+
+ sdevice = container_of(smaster->devices.prev, struct siox_device, node);
+ list_del(&sdevice->node);
+ smaster->num_devices--;
+
+ siox_master_unlock(smaster);
+
+ device_unregister(&sdevice->dev);
+
+ siox_master_lock(smaster);
+ }
+
+ siox_master_unlock(smaster);
+
+ put_device(&smaster->dev);
+}
+EXPORT_SYMBOL_GPL(siox_master_unregister);
+
+struct siox_device *siox_device_add(struct siox_master *smaster)
+{
+ struct siox_device *sdevice;
+ int ret;
+
+ sdevice = kzalloc(sizeof(*sdevice), GFP_KERNEL);
+ if (!sdevice)
+ return NULL;
+
+ sdevice->type = "siox-12x8";
+ sdevice->inbytes = 2;
+ sdevice->outbytes = 4;
+
+ sdevice->smaster = smaster;
+ sdevice->dev.parent = &smaster->dev;
+ sdevice->dev.bus = &siox_bus_type;
+ sdevice->dev.type = &siox_device_type;
+
+ siox_master_lock(smaster);
+
+ dev_set_name(&sdevice->dev, "siox-%d-%d",
+ smaster->busno, smaster->num_devices);
+
+ ret = device_register(&sdevice->dev);
+ if (ret) {
+ dev_err(&smaster->dev, "failed to register device: %d\n", ret);
+
+ goto err_device_register;
+ }
+
+ smaster->num_devices++;
+ list_add_tail(&sdevice->node, &smaster->devices);
+
+ smaster->setbuf_len += sdevice->inbytes;
+ smaster->getbuf_len += sdevice->outbytes;
+
+ if (smaster->buf_len < smaster->setbuf_len + smaster->getbuf_len) {
+ smaster->buf_len = smaster->setbuf_len + smaster->getbuf_len;
+ smaster->buf = krealloc(smaster->buf,
+ smaster->buf_len, GFP_KERNEL);
+ if (!smaster->buf) {
+ dev_err(&smaster->dev,
+ "failed to realloc buffer to %zu\n",
+ smaster->buf_len);
+ if (smaster->active)
+ __siox_stop(smaster);
+ }
+ }
+
+ siox_master_unlock(smaster);
+
+ sdevice->status_errors_kn = sysfs_get_dirent(sdevice->dev.kobj.sd,
+ "status_errors");
+ sdevice->watchdog_kn = sysfs_get_dirent(sdevice->dev.kobj.sd,
+ "watchdog");
+ sdevice->watchdog_errors_kn = sysfs_get_dirent(sdevice->dev.kobj.sd,
+ "watchdog_errors");
+
+ return sdevice;
+
+err_device_register:
+ siox_master_unlock(smaster);
+
+ kfree(sdevice);
+
+ return ERR_PTR(ret);
+}
+
+void siox_device_remove(struct siox_master *smaster)
+{
+ struct siox_device *sdevice;
+
+ siox_master_lock(smaster);
+
+ if (!smaster->num_devices)
+ return;
+
+ sdevice = container_of(smaster->devices.prev, struct siox_device, node);
+ list_del(&sdevice->node);
+ smaster->num_devices--;
+
+ smaster->setbuf_len -= sdevice->inbytes;
+ smaster->getbuf_len -= sdevice->outbytes;
+
+ if (!smaster->num_devices)
+ __siox_stop(smaster);
+
+ siox_master_unlock(smaster);
+
+ /*
+ * This must be done without holding the master lock because we're
+ * called from device_remove_store which also holds a sysfs mutex.
+ * device_unregister tries to aquire the same lock.
+ */
+ device_unregister(&sdevice->dev);
+}
+
+int __siox_driver_register(struct siox_driver *sdriver, struct module *owner)
+{
+ int ret;
+
+ if (unlikely(!siox_is_registered))
+ return -EPROBE_DEFER;
+
+ if (!sdriver->set_data && !sdriver->get_data) {
+ pr_err("Driver %s doesn't provide needed callbacks\n",
+ sdriver->driver.name);
+ return -EINVAL;
+ }
+
+ sdriver->driver.owner = owner;
+ sdriver->driver.bus = &siox_bus_type;
+
+ if (sdriver->probe)
+ sdriver->driver.probe = siox_driver_probe;
+ if (sdriver->remove)
+ sdriver->driver.remove = siox_driver_remove;
+ if (sdriver->shutdown)
+ sdriver->driver.shutdown = siox_driver_shutdown;
+
+ ret = driver_register(&sdriver->driver);
+ if (ret)
+ pr_err("Failed to register siox driver %s (%d)\n",
+ sdriver->driver.name, ret);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(__siox_driver_register);
+
+static int __init siox_init(void)
+{
+ int ret;
+
+ ret = bus_register(&siox_bus_type);
+ if (ret) {
+ pr_err("Registration of SIOX bus type failed: %d\n", ret);
+ return ret;
+ }
+
+ wqueue = create_singlethread_workqueue("siox");
+ if (!wqueue) {
+ pr_err("Creation of siox workqueue failed\n");
+ bus_unregister(&siox_bus_type);
+ return -ENOMEM;
+ }
+
+ siox_is_registered = true;
+
+ return 0;
+}
+subsys_initcall(siox_init);
+
+static void __exit siox_exit(void)
+{
+ flush_workqueue(wqueue);
+ destroy_workqueue(wqueue);
+ bus_unregister(&siox_bus_type);
+}
+module_exit(siox_exit);
+
+MODULE_AUTHOR("Uwe Kleine-Koenig <u.kleine-koenig@pengutronix.de>");
+MODULE_DESCRIPTION("Eckelmann SIOX driver core");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/siox/siox.h b/drivers/siox/siox.h
new file mode 100644
index 000000000000..1c51ccc7628f
--- /dev/null
+++ b/drivers/siox/siox.h
@@ -0,0 +1,52 @@
+/*
+ * Copyright (C) 2015 Pengutronix, Uwe Kleine-König <kernel@pengutronix.de>
+ *
+ * This program is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License version 2 as published by the
+ * Free Software Foundation.
+ */
+#include <linux/kernel.h>
+#include <linux/workqueue.h>
+
+#include <linux/siox.h>
+
+#define to_siox_master(_dev) container_of((_dev), struct siox_master, dev)
+struct siox_master {
+ /* these fields should be initialized by the driver */
+ int busno;
+ int (*pushpull)(struct siox_master *smaster,
+ size_t setbuf_len, const u8 setbuf[],
+ size_t getbuf_len, u8 getbuf[]);
+
+ /* might be initialized by the driver, if 0 it is set to HZ / 40 */
+ unsigned long poll_interval; /* in jiffies */
+
+ /* framework private stuff */
+ struct mutex lock;
+ bool active;
+ struct module *owner;
+ struct device dev;
+ unsigned num_devices;
+ struct list_head devices;
+
+ size_t setbuf_len, getbuf_len;
+ size_t buf_len;
+ u8 *buf;
+ u8 status;
+
+ struct delayed_work poll;
+};
+
+static inline void *siox_master_get_devdata(struct siox_master *smaster)
+{
+ return dev_get_drvdata(&smaster->dev);
+}
+
+struct siox_master *siox_master_alloc(struct device *dev, size_t size);
+static inline void siox_master_put(struct siox_master *smaster)
+{
+ put_device(&smaster->dev);
+}
+
+int siox_master_register(struct siox_master *smaster);
+void siox_master_unregister(struct siox_master *smaster);
diff --git a/include/linux/siox.h b/include/linux/siox.h
new file mode 100644
index 000000000000..0bd57dcc6f6b
--- /dev/null
+++ b/include/linux/siox.h
@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2015 Pengutronix, Uwe Kleine-König <kernel@pengutronix.de>
+ *
+ * This program is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License version 2 as published by the
+ * Free Software Foundation.
+ */
+
+#include <linux/device.h>
+
+#define to_siox_device(_dev) container_of((_dev), struct siox_device, dev)
+struct siox_device {
+ struct list_head node; /* node in smaster->devices */
+ struct siox_master *smaster;
+ struct device dev;
+
+ char *type;
+ size_t inbytes;
+ size_t outbytes;
+
+ u8 status;
+
+ /* statistics */
+ unsigned int watchdog_errors;
+ unsigned int status_errors;
+
+ struct kernfs_node *status_errors_kn;
+ struct kernfs_node *watchdog_kn;
+ struct kernfs_node *watchdog_errors_kn;
+};
+
+#define to_siox_driver(_drv) container_of((_drv), struct siox_driver, driver)
+struct siox_driver {
+ int (*probe)(struct siox_device *);
+ int (*remove)(struct siox_device *);
+ void (*shutdown)(struct siox_device *);
+
+ /*
+ * buf is big enough to hold sdev->inbytes - 1 bytes, the status byte
+ * is in the scope of the framework.
+ */
+ int (*set_data)(struct siox_device *, u8 status, u8 buf[]);
+ /*
+ * buf is big enough to hold sdev->outbytes - 1 bytes, the status byte
+ * is in the scope of the framework
+ */
+ int (*get_data)(struct siox_device *, const u8 buf[]);
+
+ struct device_driver driver;
+};
+
+int __siox_driver_register(struct siox_driver *sdriver, struct module *owner);
+static inline int siox_driver_register(struct siox_driver *sdriver)
+{
+ return __siox_driver_register(sdriver, THIS_MODULE);
+}
+
+static inline void siox_driver_unregister(struct siox_driver *sdriver)
+{
+ return driver_unregister(&sdriver->driver);
+}
--
2.7.0
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