| /* |
| * |
| * Intel Management Engine Interface (Intel MEI) Linux driver |
| * Copyright (c) 2003-2012, 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); |
| 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) { |
| 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 = %d\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 %d\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 = %d\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; |
| 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) { |
| 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; |
| } |
| |
| *offset = 0; |
| 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: |
| dev_err(dev->dev, ": unsupported ioctl %d.\n", cmd); |
| 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 POLLERR; |
| |
| dev = cl->dev; |
| |
| mutex_lock(&dev->device_lock); |
| |
| notify_en = cl->notify_en && (req_events & POLLPRI); |
| |
| if (dev->dev_state != MEI_DEV_ENABLED || |
| !mei_cl_is_connected(cl)) { |
| mask = POLLERR; |
| goto out; |
| } |
| |
| if (notify_en) { |
| poll_wait(file, &cl->ev_wait, wait); |
| if (cl->notify_ev) |
| mask |= POLLPRI; |
| } |
| |
| if (req_events & (POLLIN | POLLRDNORM)) { |
| poll_wait(file, &cl->rx_wait, wait); |
| |
| if (!list_empty(&cl->rd_completed)) |
| mask |= POLLIN | POLLRDNORM; |
| else |
| mei_cl_read_start(cl, mei_cl_mtu(cl), file); |
| } |
| |
| 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 struct attribute *mei_attrs[] = { |
| &dev_attr_fw_status.attr, |
| &dev_attr_hbm_ver.attr, |
| &dev_attr_hbm_ver_drv.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"); |
| |