diff options
Diffstat (limited to 'drivers/misc/mei/main.c')
| -rw-r--r-- | drivers/misc/mei/main.c | 1022 |
1 files changed, 1022 insertions, 0 deletions
diff --git a/drivers/misc/mei/main.c b/drivers/misc/mei/main.c new file mode 100644 index 000000000..87281b369 --- /dev/null +++ b/drivers/misc/mei/main.c @@ -0,0 +1,1022 @@ +/* + * + * Intel Management Engine Interface (Intel MEI) Linux driver + * Copyright (c) 2003-2018, Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope 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/module.h> +#include <linux/moduleparam.h> +#include <linux/kernel.h> +#include <linux/device.h> +#include <linux/slab.h> +#include <linux/fs.h> +#include <linux/errno.h> +#include <linux/types.h> +#include <linux/fcntl.h> +#include <linux/poll.h> +#include <linux/init.h> +#include <linux/ioctl.h> +#include <linux/cdev.h> +#include <linux/sched/signal.h> +#include <linux/uuid.h> +#include <linux/compat.h> +#include <linux/jiffies.h> +#include <linux/interrupt.h> + +#include <linux/mei.h> + +#include "mei_dev.h" +#include "client.h" + +/** + * mei_open - the open function + * + * @inode: pointer to inode structure + * @file: pointer to file structure + * + * Return: 0 on success, <0 on error + */ +static int mei_open(struct inode *inode, struct file *file) +{ + struct mei_device *dev; + struct mei_cl *cl; + + int err; + + dev = container_of(inode->i_cdev, struct mei_device, cdev); + if (!dev) + return -ENODEV; + + mutex_lock(&dev->device_lock); + + if (dev->dev_state != MEI_DEV_ENABLED) { + dev_dbg(dev->dev, "dev_state != MEI_ENABLED dev_state = %s\n", + mei_dev_state_str(dev->dev_state)); + err = -ENODEV; + goto err_unlock; + } + + cl = mei_cl_alloc_linked(dev); + if (IS_ERR(cl)) { + err = PTR_ERR(cl); + goto err_unlock; + } + + cl->fp = file; + file->private_data = cl; + + mutex_unlock(&dev->device_lock); + + return nonseekable_open(inode, file); + +err_unlock: + mutex_unlock(&dev->device_lock); + return err; +} + +/** + * mei_release - the release function + * + * @inode: pointer to inode structure + * @file: pointer to file structure + * + * Return: 0 on success, <0 on error + */ +static int mei_release(struct inode *inode, struct file *file) +{ + struct mei_cl *cl = file->private_data; + struct mei_device *dev; + int rets; + + if (WARN_ON(!cl || !cl->dev)) + return -ENODEV; + + dev = cl->dev; + + mutex_lock(&dev->device_lock); + + rets = mei_cl_disconnect(cl); + + mei_cl_flush_queues(cl, file); + cl_dbg(dev, cl, "removing\n"); + + mei_cl_unlink(cl); + + file->private_data = NULL; + + kfree(cl); + + mutex_unlock(&dev->device_lock); + return rets; +} + + +/** + * mei_read - the read function. + * + * @file: pointer to file structure + * @ubuf: pointer to user buffer + * @length: buffer length + * @offset: data offset in buffer + * + * Return: >=0 data length on success , <0 on error + */ +static ssize_t mei_read(struct file *file, char __user *ubuf, + size_t length, loff_t *offset) +{ + struct mei_cl *cl = file->private_data; + struct mei_device *dev; + struct mei_cl_cb *cb = NULL; + bool nonblock = !!(file->f_flags & O_NONBLOCK); + ssize_t rets; + + if (WARN_ON(!cl || !cl->dev)) + return -ENODEV; + + dev = cl->dev; + + + mutex_lock(&dev->device_lock); + if (dev->dev_state != MEI_DEV_ENABLED) { + rets = -ENODEV; + goto out; + } + + if (length == 0) { + rets = 0; + goto out; + } + + if (ubuf == NULL) { + rets = -EMSGSIZE; + goto out; + } + + cb = mei_cl_read_cb(cl, file); + if (cb) + goto copy_buffer; + + if (*offset > 0) + *offset = 0; + + rets = mei_cl_read_start(cl, length, file); + if (rets && rets != -EBUSY) { + cl_dbg(dev, cl, "mei start read failure status = %zd\n", rets); + goto out; + } + + if (nonblock) { + rets = -EAGAIN; + goto out; + } + + mutex_unlock(&dev->device_lock); + if (wait_event_interruptible(cl->rx_wait, + !list_empty(&cl->rd_completed) || + !mei_cl_is_connected(cl))) { + if (signal_pending(current)) + return -EINTR; + return -ERESTARTSYS; + } + mutex_lock(&dev->device_lock); + + if (!mei_cl_is_connected(cl)) { + rets = -ENODEV; + goto out; + } + + cb = mei_cl_read_cb(cl, file); + if (!cb) { + rets = 0; + goto out; + } + +copy_buffer: + /* now copy the data to user space */ + if (cb->status) { + rets = cb->status; + cl_dbg(dev, cl, "read operation failed %zd\n", rets); + goto free; + } + + cl_dbg(dev, cl, "buf.size = %zu buf.idx = %zu offset = %lld\n", + cb->buf.size, cb->buf_idx, *offset); + if (*offset >= cb->buf_idx) { + rets = 0; + goto free; + } + + /* length is being truncated to PAGE_SIZE, + * however buf_idx may point beyond that */ + length = min_t(size_t, length, cb->buf_idx - *offset); + + if (copy_to_user(ubuf, cb->buf.data + *offset, length)) { + dev_dbg(dev->dev, "failed to copy data to userland\n"); + rets = -EFAULT; + goto free; + } + + rets = length; + *offset += length; + /* not all data was read, keep the cb */ + if (*offset < cb->buf_idx) + goto out; + +free: + mei_io_cb_free(cb); + *offset = 0; + +out: + cl_dbg(dev, cl, "end mei read rets = %zd\n", rets); + mutex_unlock(&dev->device_lock); + return rets; +} +/** + * mei_write - the write function. + * + * @file: pointer to file structure + * @ubuf: pointer to user buffer + * @length: buffer length + * @offset: data offset in buffer + * + * Return: >=0 data length on success , <0 on error + */ +static ssize_t mei_write(struct file *file, const char __user *ubuf, + size_t length, loff_t *offset) +{ + struct mei_cl *cl = file->private_data; + struct mei_cl_cb *cb; + struct mei_device *dev; + ssize_t rets; + + if (WARN_ON(!cl || !cl->dev)) + return -ENODEV; + + dev = cl->dev; + + mutex_lock(&dev->device_lock); + + if (dev->dev_state != MEI_DEV_ENABLED) { + rets = -ENODEV; + goto out; + } + + if (!mei_cl_is_connected(cl)) { + cl_err(dev, cl, "is not connected"); + rets = -ENODEV; + goto out; + } + + if (!mei_me_cl_is_active(cl->me_cl)) { + rets = -ENOTTY; + goto out; + } + + if (length > mei_cl_mtu(cl)) { + rets = -EFBIG; + goto out; + } + + if (length == 0) { + rets = 0; + goto out; + } + + while (cl->tx_cb_queued >= dev->tx_queue_limit) { + if (file->f_flags & O_NONBLOCK) { + rets = -EAGAIN; + goto out; + } + mutex_unlock(&dev->device_lock); + rets = wait_event_interruptible(cl->tx_wait, + cl->writing_state == MEI_WRITE_COMPLETE || + (!mei_cl_is_connected(cl))); + mutex_lock(&dev->device_lock); + if (rets) { + if (signal_pending(current)) + rets = -EINTR; + goto out; + } + if (!mei_cl_is_connected(cl)) { + rets = -ENODEV; + goto out; + } + } + + cb = mei_cl_alloc_cb(cl, length, MEI_FOP_WRITE, file); + if (!cb) { + rets = -ENOMEM; + goto out; + } + + rets = copy_from_user(cb->buf.data, ubuf, length); + if (rets) { + dev_dbg(dev->dev, "failed to copy data from userland\n"); + rets = -EFAULT; + mei_io_cb_free(cb); + goto out; + } + + rets = mei_cl_write(cl, cb); +out: + mutex_unlock(&dev->device_lock); + return rets; +} + +/** + * mei_ioctl_connect_client - the connect to fw client IOCTL function + * + * @file: private data of the file object + * @data: IOCTL connect data, input and output parameters + * + * Locking: called under "dev->device_lock" lock + * + * Return: 0 on success, <0 on failure. + */ +static int mei_ioctl_connect_client(struct file *file, + struct mei_connect_client_data *data) +{ + struct mei_device *dev; + struct mei_client *client; + struct mei_me_client *me_cl; + struct mei_cl *cl; + int rets; + + cl = file->private_data; + dev = cl->dev; + + if (dev->dev_state != MEI_DEV_ENABLED) + return -ENODEV; + + if (cl->state != MEI_FILE_INITIALIZING && + cl->state != MEI_FILE_DISCONNECTED) + return -EBUSY; + + /* find ME client we're trying to connect to */ + me_cl = mei_me_cl_by_uuid(dev, &data->in_client_uuid); + if (!me_cl) { + dev_dbg(dev->dev, "Cannot connect to FW Client UUID = %pUl\n", + &data->in_client_uuid); + rets = -ENOTTY; + goto end; + } + + if (me_cl->props.fixed_address) { + bool forbidden = dev->override_fixed_address ? + !dev->allow_fixed_address : !dev->hbm_f_fa_supported; + if (forbidden) { + dev_dbg(dev->dev, "Connection forbidden to FW Client UUID = %pUl\n", + &data->in_client_uuid); + rets = -ENOTTY; + goto end; + } + } + + dev_dbg(dev->dev, "Connect to FW Client ID = %d\n", + me_cl->client_id); + dev_dbg(dev->dev, "FW Client - Protocol Version = %d\n", + me_cl->props.protocol_version); + dev_dbg(dev->dev, "FW Client - Max Msg Len = %d\n", + me_cl->props.max_msg_length); + + /* prepare the output buffer */ + client = &data->out_client_properties; + client->max_msg_length = me_cl->props.max_msg_length; + client->protocol_version = me_cl->props.protocol_version; + dev_dbg(dev->dev, "Can connect?\n"); + + rets = mei_cl_connect(cl, me_cl, file); + +end: + mei_me_cl_put(me_cl); + return rets; +} + +/** + * mei_ioctl_client_notify_request - + * propagate event notification request to client + * + * @file: pointer to file structure + * @request: 0 - disable, 1 - enable + * + * Return: 0 on success , <0 on error + */ +static int mei_ioctl_client_notify_request(const struct file *file, u32 request) +{ + struct mei_cl *cl = file->private_data; + + if (request != MEI_HBM_NOTIFICATION_START && + request != MEI_HBM_NOTIFICATION_STOP) + return -EINVAL; + + return mei_cl_notify_request(cl, file, (u8)request); +} + +/** + * mei_ioctl_client_notify_get - wait for notification request + * + * @file: pointer to file structure + * @notify_get: 0 - disable, 1 - enable + * + * Return: 0 on success , <0 on error + */ +static int mei_ioctl_client_notify_get(const struct file *file, u32 *notify_get) +{ + struct mei_cl *cl = file->private_data; + bool notify_ev; + bool block = (file->f_flags & O_NONBLOCK) == 0; + int rets; + + rets = mei_cl_notify_get(cl, block, ¬ify_ev); + if (rets) + return rets; + + *notify_get = notify_ev ? 1 : 0; + return 0; +} + +/** + * mei_ioctl - the IOCTL function + * + * @file: pointer to file structure + * @cmd: ioctl command + * @data: pointer to mei message structure + * + * Return: 0 on success , <0 on error + */ +static long mei_ioctl(struct file *file, unsigned int cmd, unsigned long data) +{ + struct mei_device *dev; + struct mei_cl *cl = file->private_data; + struct mei_connect_client_data connect_data; + u32 notify_get, notify_req; + int rets; + + + if (WARN_ON(!cl || !cl->dev)) + return -ENODEV; + + dev = cl->dev; + + dev_dbg(dev->dev, "IOCTL cmd = 0x%x", cmd); + + mutex_lock(&dev->device_lock); + if (dev->dev_state != MEI_DEV_ENABLED) { + rets = -ENODEV; + goto out; + } + + switch (cmd) { + case IOCTL_MEI_CONNECT_CLIENT: + dev_dbg(dev->dev, ": IOCTL_MEI_CONNECT_CLIENT.\n"); + if (copy_from_user(&connect_data, (char __user *)data, + sizeof(struct mei_connect_client_data))) { + dev_dbg(dev->dev, "failed to copy data from userland\n"); + rets = -EFAULT; + goto out; + } + + rets = mei_ioctl_connect_client(file, &connect_data); + if (rets) + goto out; + + /* if all is ok, copying the data back to user. */ + if (copy_to_user((char __user *)data, &connect_data, + sizeof(struct mei_connect_client_data))) { + dev_dbg(dev->dev, "failed to copy data to userland\n"); + rets = -EFAULT; + goto out; + } + + break; + + case IOCTL_MEI_NOTIFY_SET: + dev_dbg(dev->dev, ": IOCTL_MEI_NOTIFY_SET.\n"); + if (copy_from_user(¬ify_req, + (char __user *)data, sizeof(notify_req))) { + dev_dbg(dev->dev, "failed to copy data from userland\n"); + rets = -EFAULT; + goto out; + } + rets = mei_ioctl_client_notify_request(file, notify_req); + break; + + case IOCTL_MEI_NOTIFY_GET: + dev_dbg(dev->dev, ": IOCTL_MEI_NOTIFY_GET.\n"); + rets = mei_ioctl_client_notify_get(file, ¬ify_get); + if (rets) + goto out; + + dev_dbg(dev->dev, "copy connect data to user\n"); + if (copy_to_user((char __user *)data, + ¬ify_get, sizeof(notify_get))) { + dev_dbg(dev->dev, "failed to copy data to userland\n"); + rets = -EFAULT; + goto out; + + } + break; + + default: + rets = -ENOIOCTLCMD; + } + +out: + mutex_unlock(&dev->device_lock); + return rets; +} + +/** + * mei_compat_ioctl - the compat IOCTL function + * + * @file: pointer to file structure + * @cmd: ioctl command + * @data: pointer to mei message structure + * + * Return: 0 on success , <0 on error + */ +#ifdef CONFIG_COMPAT +static long mei_compat_ioctl(struct file *file, + unsigned int cmd, unsigned long data) +{ + return mei_ioctl(file, cmd, (unsigned long)compat_ptr(data)); +} +#endif + + +/** + * mei_poll - the poll function + * + * @file: pointer to file structure + * @wait: pointer to poll_table structure + * + * Return: poll mask + */ +static __poll_t mei_poll(struct file *file, poll_table *wait) +{ + __poll_t req_events = poll_requested_events(wait); + struct mei_cl *cl = file->private_data; + struct mei_device *dev; + __poll_t mask = 0; + bool notify_en; + + if (WARN_ON(!cl || !cl->dev)) + return EPOLLERR; + + dev = cl->dev; + + mutex_lock(&dev->device_lock); + + notify_en = cl->notify_en && (req_events & EPOLLPRI); + + if (dev->dev_state != MEI_DEV_ENABLED || + !mei_cl_is_connected(cl)) { + mask = EPOLLERR; + goto out; + } + + if (notify_en) { + poll_wait(file, &cl->ev_wait, wait); + if (cl->notify_ev) + mask |= EPOLLPRI; + } + + if (req_events & (EPOLLIN | EPOLLRDNORM)) { + poll_wait(file, &cl->rx_wait, wait); + + if (!list_empty(&cl->rd_completed)) + mask |= EPOLLIN | EPOLLRDNORM; + else + mei_cl_read_start(cl, mei_cl_mtu(cl), file); + } + + if (req_events & (EPOLLOUT | EPOLLWRNORM)) { + poll_wait(file, &cl->tx_wait, wait); + if (cl->tx_cb_queued < dev->tx_queue_limit) + mask |= EPOLLOUT | EPOLLWRNORM; + } + +out: + mutex_unlock(&dev->device_lock); + return mask; +} + +/** + * mei_cl_is_write_queued - check if the client has pending writes. + * + * @cl: writing host client + * + * Return: true if client is writing, false otherwise. + */ +static bool mei_cl_is_write_queued(struct mei_cl *cl) +{ + struct mei_device *dev = cl->dev; + struct mei_cl_cb *cb; + + list_for_each_entry(cb, &dev->write_list, list) + if (cb->cl == cl) + return true; + list_for_each_entry(cb, &dev->write_waiting_list, list) + if (cb->cl == cl) + return true; + return false; +} + +/** + * mei_fsync - the fsync handler + * + * @fp: pointer to file structure + * @start: unused + * @end: unused + * @datasync: unused + * + * Return: 0 on success, -ENODEV if client is not connected + */ +static int mei_fsync(struct file *fp, loff_t start, loff_t end, int datasync) +{ + struct mei_cl *cl = fp->private_data; + struct mei_device *dev; + int rets; + + if (WARN_ON(!cl || !cl->dev)) + return -ENODEV; + + dev = cl->dev; + + mutex_lock(&dev->device_lock); + + if (dev->dev_state != MEI_DEV_ENABLED || !mei_cl_is_connected(cl)) { + rets = -ENODEV; + goto out; + } + + while (mei_cl_is_write_queued(cl)) { + mutex_unlock(&dev->device_lock); + rets = wait_event_interruptible(cl->tx_wait, + cl->writing_state == MEI_WRITE_COMPLETE || + !mei_cl_is_connected(cl)); + mutex_lock(&dev->device_lock); + if (rets) { + if (signal_pending(current)) + rets = -EINTR; + goto out; + } + if (!mei_cl_is_connected(cl)) { + rets = -ENODEV; + goto out; + } + } + rets = 0; +out: + mutex_unlock(&dev->device_lock); + return rets; +} + +/** + * mei_fasync - asynchronous io support + * + * @fd: file descriptor + * @file: pointer to file structure + * @band: band bitmap + * + * Return: negative on error, + * 0 if it did no changes, + * and positive a process was added or deleted + */ +static int mei_fasync(int fd, struct file *file, int band) +{ + + struct mei_cl *cl = file->private_data; + + if (!mei_cl_is_connected(cl)) + return -ENODEV; + + return fasync_helper(fd, file, band, &cl->ev_async); +} + +/** + * fw_status_show - mei device fw_status attribute show method + * + * @device: device pointer + * @attr: attribute pointer + * @buf: char out buffer + * + * Return: number of the bytes printed into buf or error + */ +static ssize_t fw_status_show(struct device *device, + struct device_attribute *attr, char *buf) +{ + struct mei_device *dev = dev_get_drvdata(device); + struct mei_fw_status fw_status; + int err, i; + ssize_t cnt = 0; + + mutex_lock(&dev->device_lock); + err = mei_fw_status(dev, &fw_status); + mutex_unlock(&dev->device_lock); + if (err) { + dev_err(device, "read fw_status error = %d\n", err); + return err; + } + + for (i = 0; i < fw_status.count; i++) + cnt += scnprintf(buf + cnt, PAGE_SIZE - cnt, "%08X\n", + fw_status.status[i]); + return cnt; +} +static DEVICE_ATTR_RO(fw_status); + +/** + * hbm_ver_show - display HBM protocol version negotiated with FW + * + * @device: device pointer + * @attr: attribute pointer + * @buf: char out buffer + * + * Return: number of the bytes printed into buf or error + */ +static ssize_t hbm_ver_show(struct device *device, + struct device_attribute *attr, char *buf) +{ + struct mei_device *dev = dev_get_drvdata(device); + struct hbm_version ver; + + mutex_lock(&dev->device_lock); + ver = dev->version; + mutex_unlock(&dev->device_lock); + + return sprintf(buf, "%u.%u\n", ver.major_version, ver.minor_version); +} +static DEVICE_ATTR_RO(hbm_ver); + +/** + * hbm_ver_drv_show - display HBM protocol version advertised by driver + * + * @device: device pointer + * @attr: attribute pointer + * @buf: char out buffer + * + * Return: number of the bytes printed into buf or error + */ +static ssize_t hbm_ver_drv_show(struct device *device, + struct device_attribute *attr, char *buf) +{ + return sprintf(buf, "%u.%u\n", HBM_MAJOR_VERSION, HBM_MINOR_VERSION); +} +static DEVICE_ATTR_RO(hbm_ver_drv); + +static ssize_t tx_queue_limit_show(struct device *device, + struct device_attribute *attr, char *buf) +{ + struct mei_device *dev = dev_get_drvdata(device); + u8 size = 0; + + mutex_lock(&dev->device_lock); + size = dev->tx_queue_limit; + mutex_unlock(&dev->device_lock); + + return snprintf(buf, PAGE_SIZE, "%u\n", size); +} + +static ssize_t tx_queue_limit_store(struct device *device, + struct device_attribute *attr, + const char *buf, size_t count) +{ + struct mei_device *dev = dev_get_drvdata(device); + u8 limit; + unsigned int inp; + int err; + + err = kstrtouint(buf, 10, &inp); + if (err) + return err; + if (inp > MEI_TX_QUEUE_LIMIT_MAX || inp < MEI_TX_QUEUE_LIMIT_MIN) + return -EINVAL; + limit = inp; + + mutex_lock(&dev->device_lock); + dev->tx_queue_limit = limit; + mutex_unlock(&dev->device_lock); + + return count; +} +static DEVICE_ATTR_RW(tx_queue_limit); + +/** + * fw_ver_show - display ME FW version + * + * @device: device pointer + * @attr: attribute pointer + * @buf: char out buffer + * + * Return: number of the bytes printed into buf or error + */ +static ssize_t fw_ver_show(struct device *device, + struct device_attribute *attr, char *buf) +{ + struct mei_device *dev = dev_get_drvdata(device); + struct mei_fw_version *ver; + ssize_t cnt = 0; + int i; + + ver = dev->fw_ver; + + for (i = 0; i < MEI_MAX_FW_VER_BLOCKS; i++) + cnt += scnprintf(buf + cnt, PAGE_SIZE - cnt, "%u:%u.%u.%u.%u\n", + ver[i].platform, ver[i].major, ver[i].minor, + ver[i].hotfix, ver[i].buildno); + return cnt; +} +static DEVICE_ATTR_RO(fw_ver); + +static struct attribute *mei_attrs[] = { + &dev_attr_fw_status.attr, + &dev_attr_hbm_ver.attr, + &dev_attr_hbm_ver_drv.attr, + &dev_attr_tx_queue_limit.attr, + &dev_attr_fw_ver.attr, + NULL +}; +ATTRIBUTE_GROUPS(mei); + +/* + * file operations structure will be used for mei char device. + */ +static const struct file_operations mei_fops = { + .owner = THIS_MODULE, + .read = mei_read, + .unlocked_ioctl = mei_ioctl, +#ifdef CONFIG_COMPAT + .compat_ioctl = mei_compat_ioctl, +#endif + .open = mei_open, + .release = mei_release, + .write = mei_write, + .poll = mei_poll, + .fsync = mei_fsync, + .fasync = mei_fasync, + .llseek = no_llseek +}; + +static struct class *mei_class; +static dev_t mei_devt; +#define MEI_MAX_DEVS MINORMASK +static DEFINE_MUTEX(mei_minor_lock); +static DEFINE_IDR(mei_idr); + +/** + * mei_minor_get - obtain next free device minor number + * + * @dev: device pointer + * + * Return: allocated minor, or -ENOSPC if no free minor left + */ +static int mei_minor_get(struct mei_device *dev) +{ + int ret; + + mutex_lock(&mei_minor_lock); + ret = idr_alloc(&mei_idr, dev, 0, MEI_MAX_DEVS, GFP_KERNEL); + if (ret >= 0) + dev->minor = ret; + else if (ret == -ENOSPC) + dev_err(dev->dev, "too many mei devices\n"); + + mutex_unlock(&mei_minor_lock); + return ret; +} + +/** + * mei_minor_free - mark device minor number as free + * + * @dev: device pointer + */ +static void mei_minor_free(struct mei_device *dev) +{ + mutex_lock(&mei_minor_lock); + idr_remove(&mei_idr, dev->minor); + mutex_unlock(&mei_minor_lock); +} + +int mei_register(struct mei_device *dev, struct device *parent) +{ + struct device *clsdev; /* class device */ + int ret, devno; + + ret = mei_minor_get(dev); + if (ret < 0) + return ret; + + /* Fill in the data structures */ + devno = MKDEV(MAJOR(mei_devt), dev->minor); + cdev_init(&dev->cdev, &mei_fops); + dev->cdev.owner = parent->driver->owner; + + /* Add the device */ + ret = cdev_add(&dev->cdev, devno, 1); + if (ret) { + dev_err(parent, "unable to add device %d:%d\n", + MAJOR(mei_devt), dev->minor); + goto err_dev_add; + } + + clsdev = device_create_with_groups(mei_class, parent, devno, + dev, mei_groups, + "mei%d", dev->minor); + + if (IS_ERR(clsdev)) { + dev_err(parent, "unable to create device %d:%d\n", + MAJOR(mei_devt), dev->minor); + ret = PTR_ERR(clsdev); + goto err_dev_create; + } + + ret = mei_dbgfs_register(dev, dev_name(clsdev)); + if (ret) { + dev_err(clsdev, "cannot register debugfs ret = %d\n", ret); + goto err_dev_dbgfs; + } + + return 0; + +err_dev_dbgfs: + device_destroy(mei_class, devno); +err_dev_create: + cdev_del(&dev->cdev); +err_dev_add: + mei_minor_free(dev); + return ret; +} +EXPORT_SYMBOL_GPL(mei_register); + +void mei_deregister(struct mei_device *dev) +{ + int devno; + + devno = dev->cdev.dev; + cdev_del(&dev->cdev); + + mei_dbgfs_deregister(dev); + + device_destroy(mei_class, devno); + + mei_minor_free(dev); +} +EXPORT_SYMBOL_GPL(mei_deregister); + +static int __init mei_init(void) +{ + int ret; + + mei_class = class_create(THIS_MODULE, "mei"); + if (IS_ERR(mei_class)) { + pr_err("couldn't create class\n"); + ret = PTR_ERR(mei_class); + goto err; + } + + ret = alloc_chrdev_region(&mei_devt, 0, MEI_MAX_DEVS, "mei"); + if (ret < 0) { + pr_err("unable to allocate char dev region\n"); + goto err_class; + } + + ret = mei_cl_bus_init(); + if (ret < 0) { + pr_err("unable to initialize bus\n"); + goto err_chrdev; + } + + return 0; + +err_chrdev: + unregister_chrdev_region(mei_devt, MEI_MAX_DEVS); +err_class: + class_destroy(mei_class); +err: + return ret; +} + +static void __exit mei_exit(void) +{ + unregister_chrdev_region(mei_devt, MEI_MAX_DEVS); + class_destroy(mei_class); + mei_cl_bus_exit(); +} + +module_init(mei_init); +module_exit(mei_exit); + +MODULE_AUTHOR("Intel Corporation"); +MODULE_DESCRIPTION("Intel(R) Management Engine Interface"); +MODULE_LICENSE("GPL v2"); + |