1335 lines
27 KiB
C
1335 lines
27 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright (c) 2012-2019, Intel Corporation. All rights reserved.
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* Intel Management Engine Interface (Intel MEI) Linux driver
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*/
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/kernel.h>
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#include <linux/sched/signal.h>
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#include <linux/init.h>
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#include <linux/errno.h>
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#include <linux/slab.h>
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#include <linux/mutex.h>
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#include <linux/interrupt.h>
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#include <linux/mei_cl_bus.h>
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#include "mei_dev.h"
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#include "client.h"
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#define to_mei_cl_driver(d) container_of(d, struct mei_cl_driver, driver)
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/**
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* __mei_cl_send - internal client send (write)
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*
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* @cl: host client
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* @buf: buffer to send
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* @length: buffer length
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* @vtag: virtual tag
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* @mode: sending mode
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*
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* Return: written size bytes or < 0 on error
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*/
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ssize_t __mei_cl_send(struct mei_cl *cl, u8 *buf, size_t length, u8 vtag,
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unsigned int mode)
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{
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struct mei_device *bus;
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struct mei_cl_cb *cb;
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ssize_t rets;
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if (WARN_ON(!cl || !cl->dev))
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return -ENODEV;
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bus = cl->dev;
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mutex_lock(&bus->device_lock);
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if (bus->dev_state != MEI_DEV_ENABLED) {
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rets = -ENODEV;
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goto out;
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}
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if (!mei_cl_is_connected(cl)) {
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rets = -ENODEV;
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goto out;
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}
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/* Check if we have an ME client device */
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if (!mei_me_cl_is_active(cl->me_cl)) {
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rets = -ENOTTY;
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goto out;
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}
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if (length > mei_cl_mtu(cl)) {
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rets = -EFBIG;
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goto out;
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}
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while (cl->tx_cb_queued >= bus->tx_queue_limit) {
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mutex_unlock(&bus->device_lock);
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rets = wait_event_interruptible(cl->tx_wait,
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cl->writing_state == MEI_WRITE_COMPLETE ||
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(!mei_cl_is_connected(cl)));
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mutex_lock(&bus->device_lock);
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if (rets) {
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if (signal_pending(current))
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rets = -EINTR;
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goto out;
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}
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if (!mei_cl_is_connected(cl)) {
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rets = -ENODEV;
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goto out;
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}
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}
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cb = mei_cl_alloc_cb(cl, length, MEI_FOP_WRITE, NULL);
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if (!cb) {
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rets = -ENOMEM;
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goto out;
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}
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cb->vtag = vtag;
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cb->internal = !!(mode & MEI_CL_IO_TX_INTERNAL);
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cb->blocking = !!(mode & MEI_CL_IO_TX_BLOCKING);
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memcpy(cb->buf.data, buf, length);
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rets = mei_cl_write(cl, cb);
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out:
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mutex_unlock(&bus->device_lock);
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return rets;
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}
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/**
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* __mei_cl_recv - internal client receive (read)
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*
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* @cl: host client
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* @buf: buffer to receive
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* @length: buffer length
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* @mode: io mode
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* @vtag: virtual tag
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* @timeout: recv timeout, 0 for infinite timeout
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*
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* Return: read size in bytes of < 0 on error
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*/
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ssize_t __mei_cl_recv(struct mei_cl *cl, u8 *buf, size_t length, u8 *vtag,
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unsigned int mode, unsigned long timeout)
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{
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struct mei_device *bus;
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struct mei_cl_cb *cb;
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size_t r_length;
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ssize_t rets;
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bool nonblock = !!(mode & MEI_CL_IO_RX_NONBLOCK);
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if (WARN_ON(!cl || !cl->dev))
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return -ENODEV;
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bus = cl->dev;
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mutex_lock(&bus->device_lock);
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if (bus->dev_state != MEI_DEV_ENABLED) {
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rets = -ENODEV;
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goto out;
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}
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cb = mei_cl_read_cb(cl, NULL);
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if (cb)
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goto copy;
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rets = mei_cl_read_start(cl, length, NULL);
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if (rets && rets != -EBUSY)
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goto out;
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if (nonblock) {
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rets = -EAGAIN;
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goto out;
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}
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/* wait on event only if there is no other waiter */
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/* synchronized under device mutex */
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if (!waitqueue_active(&cl->rx_wait)) {
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mutex_unlock(&bus->device_lock);
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if (timeout) {
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rets = wait_event_interruptible_timeout
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(cl->rx_wait,
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mei_cl_read_cb(cl, NULL) ||
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(!mei_cl_is_connected(cl)),
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msecs_to_jiffies(timeout));
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if (rets == 0)
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return -ETIME;
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if (rets < 0) {
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if (signal_pending(current))
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return -EINTR;
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return -ERESTARTSYS;
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}
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} else {
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if (wait_event_interruptible
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(cl->rx_wait,
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mei_cl_read_cb(cl, NULL) ||
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(!mei_cl_is_connected(cl)))) {
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if (signal_pending(current))
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return -EINTR;
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return -ERESTARTSYS;
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}
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}
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mutex_lock(&bus->device_lock);
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if (!mei_cl_is_connected(cl)) {
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rets = -ENODEV;
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goto out;
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}
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}
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cb = mei_cl_read_cb(cl, NULL);
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if (!cb) {
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rets = 0;
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goto out;
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}
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copy:
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if (cb->status) {
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rets = cb->status;
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goto free;
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}
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r_length = min_t(size_t, length, cb->buf_idx);
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memcpy(buf, cb->buf.data, r_length);
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rets = r_length;
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if (vtag)
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*vtag = cb->vtag;
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free:
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mei_cl_del_rd_completed(cl, cb);
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out:
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mutex_unlock(&bus->device_lock);
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return rets;
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}
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/**
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* mei_cldev_send_vtag - me device send with vtag (write)
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*
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* @cldev: me client device
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* @buf: buffer to send
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* @length: buffer length
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* @vtag: virtual tag
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*
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* Return:
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* * written size in bytes
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* * < 0 on error
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*/
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ssize_t mei_cldev_send_vtag(struct mei_cl_device *cldev, u8 *buf, size_t length,
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u8 vtag)
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{
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struct mei_cl *cl = cldev->cl;
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return __mei_cl_send(cl, buf, length, vtag, MEI_CL_IO_TX_BLOCKING);
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}
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EXPORT_SYMBOL_GPL(mei_cldev_send_vtag);
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/**
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* mei_cldev_recv_vtag - client receive with vtag (read)
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*
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* @cldev: me client device
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* @buf: buffer to receive
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* @length: buffer length
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* @vtag: virtual tag
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*
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* Return:
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* * read size in bytes
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* * < 0 on error
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*/
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ssize_t mei_cldev_recv_vtag(struct mei_cl_device *cldev, u8 *buf, size_t length,
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u8 *vtag)
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{
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struct mei_cl *cl = cldev->cl;
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return __mei_cl_recv(cl, buf, length, vtag, 0, 0);
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}
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EXPORT_SYMBOL_GPL(mei_cldev_recv_vtag);
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/**
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* mei_cldev_recv_nonblock_vtag - non block client receive with vtag (read)
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*
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* @cldev: me client device
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* @buf: buffer to receive
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* @length: buffer length
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* @vtag: virtual tag
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*
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* Return:
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* * read size in bytes
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* * -EAGAIN if function will block.
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* * < 0 on other error
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*/
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ssize_t mei_cldev_recv_nonblock_vtag(struct mei_cl_device *cldev, u8 *buf,
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size_t length, u8 *vtag)
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{
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struct mei_cl *cl = cldev->cl;
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return __mei_cl_recv(cl, buf, length, vtag, MEI_CL_IO_RX_NONBLOCK, 0);
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}
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EXPORT_SYMBOL_GPL(mei_cldev_recv_nonblock_vtag);
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/**
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* mei_cldev_send - me device send (write)
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*
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* @cldev: me client device
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* @buf: buffer to send
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* @length: buffer length
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*
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* Return:
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* * written size in bytes
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* * < 0 on error
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*/
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ssize_t mei_cldev_send(struct mei_cl_device *cldev, u8 *buf, size_t length)
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{
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return mei_cldev_send_vtag(cldev, buf, length, 0);
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}
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EXPORT_SYMBOL_GPL(mei_cldev_send);
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/**
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* mei_cldev_recv - client receive (read)
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*
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* @cldev: me client device
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* @buf: buffer to receive
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* @length: buffer length
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*
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* Return: read size in bytes of < 0 on error
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*/
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ssize_t mei_cldev_recv(struct mei_cl_device *cldev, u8 *buf, size_t length)
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{
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return mei_cldev_recv_vtag(cldev, buf, length, NULL);
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}
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EXPORT_SYMBOL_GPL(mei_cldev_recv);
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/**
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* mei_cldev_recv_nonblock - non block client receive (read)
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*
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* @cldev: me client device
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* @buf: buffer to receive
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* @length: buffer length
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*
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* Return: read size in bytes of < 0 on error
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* -EAGAIN if function will block.
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*/
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ssize_t mei_cldev_recv_nonblock(struct mei_cl_device *cldev, u8 *buf,
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size_t length)
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{
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return mei_cldev_recv_nonblock_vtag(cldev, buf, length, NULL);
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}
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EXPORT_SYMBOL_GPL(mei_cldev_recv_nonblock);
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/**
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* mei_cl_bus_rx_work - dispatch rx event for a bus device
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*
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* @work: work
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*/
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static void mei_cl_bus_rx_work(struct work_struct *work)
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{
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struct mei_cl_device *cldev;
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struct mei_device *bus;
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cldev = container_of(work, struct mei_cl_device, rx_work);
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bus = cldev->bus;
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if (cldev->rx_cb)
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cldev->rx_cb(cldev);
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mutex_lock(&bus->device_lock);
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if (mei_cl_is_connected(cldev->cl))
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mei_cl_read_start(cldev->cl, mei_cl_mtu(cldev->cl), NULL);
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mutex_unlock(&bus->device_lock);
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}
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/**
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* mei_cl_bus_notif_work - dispatch FW notif event for a bus device
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*
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* @work: work
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*/
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static void mei_cl_bus_notif_work(struct work_struct *work)
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{
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struct mei_cl_device *cldev;
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cldev = container_of(work, struct mei_cl_device, notif_work);
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if (cldev->notif_cb)
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cldev->notif_cb(cldev);
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}
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/**
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* mei_cl_bus_notify_event - schedule notify cb on bus client
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*
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* @cl: host client
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*
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* Return: true if event was scheduled
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* false if the client is not waiting for event
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*/
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bool mei_cl_bus_notify_event(struct mei_cl *cl)
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{
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struct mei_cl_device *cldev = cl->cldev;
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if (!cldev || !cldev->notif_cb)
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return false;
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if (!cl->notify_ev)
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return false;
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schedule_work(&cldev->notif_work);
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cl->notify_ev = false;
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return true;
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}
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/**
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* mei_cl_bus_rx_event - schedule rx event
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*
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* @cl: host client
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*
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* Return: true if event was scheduled
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* false if the client is not waiting for event
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*/
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bool mei_cl_bus_rx_event(struct mei_cl *cl)
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{
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struct mei_cl_device *cldev = cl->cldev;
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if (!cldev || !cldev->rx_cb)
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return false;
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schedule_work(&cldev->rx_work);
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return true;
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}
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/**
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* mei_cldev_register_rx_cb - register Rx event callback
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*
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* @cldev: me client devices
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* @rx_cb: callback function
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*
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* Return: 0 on success
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* -EALREADY if an callback is already registered
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* <0 on other errors
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*/
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int mei_cldev_register_rx_cb(struct mei_cl_device *cldev, mei_cldev_cb_t rx_cb)
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{
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struct mei_device *bus = cldev->bus;
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int ret;
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if (!rx_cb)
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return -EINVAL;
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if (cldev->rx_cb)
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return -EALREADY;
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cldev->rx_cb = rx_cb;
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INIT_WORK(&cldev->rx_work, mei_cl_bus_rx_work);
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mutex_lock(&bus->device_lock);
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if (mei_cl_is_connected(cldev->cl))
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ret = mei_cl_read_start(cldev->cl, mei_cl_mtu(cldev->cl), NULL);
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else
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ret = -ENODEV;
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mutex_unlock(&bus->device_lock);
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if (ret && ret != -EBUSY) {
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cancel_work_sync(&cldev->rx_work);
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cldev->rx_cb = NULL;
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return ret;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(mei_cldev_register_rx_cb);
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/**
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* mei_cldev_register_notif_cb - register FW notification event callback
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*
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* @cldev: me client devices
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* @notif_cb: callback function
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*
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* Return: 0 on success
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* -EALREADY if an callback is already registered
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* <0 on other errors
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*/
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int mei_cldev_register_notif_cb(struct mei_cl_device *cldev,
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mei_cldev_cb_t notif_cb)
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{
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struct mei_device *bus = cldev->bus;
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int ret;
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if (!notif_cb)
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return -EINVAL;
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if (cldev->notif_cb)
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return -EALREADY;
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cldev->notif_cb = notif_cb;
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INIT_WORK(&cldev->notif_work, mei_cl_bus_notif_work);
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mutex_lock(&bus->device_lock);
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ret = mei_cl_notify_request(cldev->cl, NULL, 1);
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mutex_unlock(&bus->device_lock);
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if (ret) {
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cancel_work_sync(&cldev->notif_work);
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cldev->notif_cb = NULL;
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return ret;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(mei_cldev_register_notif_cb);
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/**
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* mei_cldev_get_drvdata - driver data getter
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*
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* @cldev: mei client device
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*
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* Return: driver private data
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*/
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void *mei_cldev_get_drvdata(const struct mei_cl_device *cldev)
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{
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return dev_get_drvdata(&cldev->dev);
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}
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EXPORT_SYMBOL_GPL(mei_cldev_get_drvdata);
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/**
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* mei_cldev_set_drvdata - driver data setter
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*
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* @cldev: mei client device
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* @data: data to store
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*/
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void mei_cldev_set_drvdata(struct mei_cl_device *cldev, void *data)
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{
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dev_set_drvdata(&cldev->dev, data);
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}
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EXPORT_SYMBOL_GPL(mei_cldev_set_drvdata);
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/**
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* mei_cldev_uuid - return uuid of the underlying me client
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*
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* @cldev: mei client device
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*
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* Return: me client uuid
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*/
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const uuid_le *mei_cldev_uuid(const struct mei_cl_device *cldev)
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{
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return mei_me_cl_uuid(cldev->me_cl);
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}
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EXPORT_SYMBOL_GPL(mei_cldev_uuid);
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|
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/**
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* mei_cldev_ver - return protocol version of the underlying me client
|
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*
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* @cldev: mei client device
|
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*
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* Return: me client protocol version
|
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*/
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u8 mei_cldev_ver(const struct mei_cl_device *cldev)
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{
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return mei_me_cl_ver(cldev->me_cl);
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}
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EXPORT_SYMBOL_GPL(mei_cldev_ver);
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/**
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|
* mei_cldev_enabled - check whether the device is enabled
|
|
*
|
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* @cldev: mei client device
|
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*
|
|
* Return: true if me client is initialized and connected
|
|
*/
|
|
bool mei_cldev_enabled(struct mei_cl_device *cldev)
|
|
{
|
|
return mei_cl_is_connected(cldev->cl);
|
|
}
|
|
EXPORT_SYMBOL_GPL(mei_cldev_enabled);
|
|
|
|
/**
|
|
* mei_cl_bus_module_get - acquire module of the underlying
|
|
* hw driver.
|
|
*
|
|
* @cldev: mei client device
|
|
*
|
|
* Return: true on success; false if the module was removed.
|
|
*/
|
|
static bool mei_cl_bus_module_get(struct mei_cl_device *cldev)
|
|
{
|
|
return try_module_get(cldev->bus->dev->driver->owner);
|
|
}
|
|
|
|
/**
|
|
* mei_cl_bus_module_put - release the underlying hw module.
|
|
*
|
|
* @cldev: mei client device
|
|
*/
|
|
static void mei_cl_bus_module_put(struct mei_cl_device *cldev)
|
|
{
|
|
module_put(cldev->bus->dev->driver->owner);
|
|
}
|
|
|
|
/**
|
|
* mei_cl_bus_vtag - get bus vtag entry wrapper
|
|
* The tag for bus client is always first.
|
|
*
|
|
* @cl: host client
|
|
*
|
|
* Return: bus vtag or NULL
|
|
*/
|
|
static inline struct mei_cl_vtag *mei_cl_bus_vtag(struct mei_cl *cl)
|
|
{
|
|
return list_first_entry_or_null(&cl->vtag_map,
|
|
struct mei_cl_vtag, list);
|
|
}
|
|
|
|
/**
|
|
* mei_cl_bus_vtag_alloc - add bus client entry to vtag map
|
|
*
|
|
* @cldev: me client device
|
|
*
|
|
* Return:
|
|
* * 0 on success
|
|
* * -ENOMEM if memory allocation failed
|
|
*/
|
|
static int mei_cl_bus_vtag_alloc(struct mei_cl_device *cldev)
|
|
{
|
|
struct mei_cl *cl = cldev->cl;
|
|
struct mei_cl_vtag *cl_vtag;
|
|
|
|
/*
|
|
* Bail out if the client does not supports vtags
|
|
* or has already allocated one
|
|
*/
|
|
if (mei_cl_vt_support_check(cl) || mei_cl_bus_vtag(cl))
|
|
return 0;
|
|
|
|
cl_vtag = mei_cl_vtag_alloc(NULL, 0);
|
|
if (IS_ERR(cl_vtag))
|
|
return -ENOMEM;
|
|
|
|
list_add_tail(&cl_vtag->list, &cl->vtag_map);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* mei_cl_bus_vtag_free - remove the bus entry from vtag map
|
|
*
|
|
* @cldev: me client device
|
|
*/
|
|
static void mei_cl_bus_vtag_free(struct mei_cl_device *cldev)
|
|
{
|
|
struct mei_cl *cl = cldev->cl;
|
|
struct mei_cl_vtag *cl_vtag;
|
|
|
|
cl_vtag = mei_cl_bus_vtag(cl);
|
|
if (!cl_vtag)
|
|
return;
|
|
|
|
list_del(&cl_vtag->list);
|
|
kfree(cl_vtag);
|
|
}
|
|
|
|
/**
|
|
* mei_cldev_enable - enable me client device
|
|
* create connection with me client
|
|
*
|
|
* @cldev: me client device
|
|
*
|
|
* Return: 0 on success and < 0 on error
|
|
*/
|
|
int mei_cldev_enable(struct mei_cl_device *cldev)
|
|
{
|
|
struct mei_device *bus = cldev->bus;
|
|
struct mei_cl *cl;
|
|
int ret;
|
|
|
|
cl = cldev->cl;
|
|
|
|
mutex_lock(&bus->device_lock);
|
|
if (cl->state == MEI_FILE_UNINITIALIZED) {
|
|
ret = mei_cl_link(cl);
|
|
if (ret)
|
|
goto out;
|
|
/* update pointers */
|
|
cl->cldev = cldev;
|
|
}
|
|
|
|
if (mei_cl_is_connected(cl)) {
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
|
|
if (!mei_me_cl_is_active(cldev->me_cl)) {
|
|
dev_err(&cldev->dev, "me client is not active\n");
|
|
ret = -ENOTTY;
|
|
goto out;
|
|
}
|
|
|
|
ret = mei_cl_bus_vtag_alloc(cldev);
|
|
if (ret)
|
|
goto out;
|
|
|
|
ret = mei_cl_connect(cl, cldev->me_cl, NULL);
|
|
if (ret < 0) {
|
|
dev_err(&cldev->dev, "cannot connect\n");
|
|
mei_cl_bus_vtag_free(cldev);
|
|
}
|
|
|
|
out:
|
|
mutex_unlock(&bus->device_lock);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(mei_cldev_enable);
|
|
|
|
/**
|
|
* mei_cldev_unregister_callbacks - internal wrapper for unregistering
|
|
* callbacks.
|
|
*
|
|
* @cldev: client device
|
|
*/
|
|
static void mei_cldev_unregister_callbacks(struct mei_cl_device *cldev)
|
|
{
|
|
if (cldev->rx_cb) {
|
|
cancel_work_sync(&cldev->rx_work);
|
|
cldev->rx_cb = NULL;
|
|
}
|
|
|
|
if (cldev->notif_cb) {
|
|
cancel_work_sync(&cldev->notif_work);
|
|
cldev->notif_cb = NULL;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* mei_cldev_disable - disable me client device
|
|
* disconnect form the me client
|
|
*
|
|
* @cldev: me client device
|
|
*
|
|
* Return: 0 on success and < 0 on error
|
|
*/
|
|
int mei_cldev_disable(struct mei_cl_device *cldev)
|
|
{
|
|
struct mei_device *bus;
|
|
struct mei_cl *cl;
|
|
int err;
|
|
|
|
if (!cldev)
|
|
return -ENODEV;
|
|
|
|
cl = cldev->cl;
|
|
|
|
bus = cldev->bus;
|
|
|
|
mei_cldev_unregister_callbacks(cldev);
|
|
|
|
mutex_lock(&bus->device_lock);
|
|
|
|
mei_cl_bus_vtag_free(cldev);
|
|
|
|
if (!mei_cl_is_connected(cl)) {
|
|
dev_dbg(bus->dev, "Already disconnected\n");
|
|
err = 0;
|
|
goto out;
|
|
}
|
|
|
|
err = mei_cl_disconnect(cl);
|
|
if (err < 0)
|
|
dev_err(bus->dev, "Could not disconnect from the ME client\n");
|
|
|
|
out:
|
|
/* Flush queues and remove any pending read */
|
|
mei_cl_flush_queues(cl, NULL);
|
|
mei_cl_unlink(cl);
|
|
|
|
mutex_unlock(&bus->device_lock);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(mei_cldev_disable);
|
|
|
|
/**
|
|
* mei_cl_device_find - find matching entry in the driver id table
|
|
*
|
|
* @cldev: me client device
|
|
* @cldrv: me client driver
|
|
*
|
|
* Return: id on success; NULL if no id is matching
|
|
*/
|
|
static const
|
|
struct mei_cl_device_id *mei_cl_device_find(struct mei_cl_device *cldev,
|
|
struct mei_cl_driver *cldrv)
|
|
{
|
|
const struct mei_cl_device_id *id;
|
|
const uuid_le *uuid;
|
|
u8 version;
|
|
bool match;
|
|
|
|
uuid = mei_me_cl_uuid(cldev->me_cl);
|
|
version = mei_me_cl_ver(cldev->me_cl);
|
|
|
|
id = cldrv->id_table;
|
|
while (uuid_le_cmp(NULL_UUID_LE, id->uuid)) {
|
|
if (!uuid_le_cmp(*uuid, id->uuid)) {
|
|
match = true;
|
|
|
|
if (cldev->name[0])
|
|
if (strncmp(cldev->name, id->name,
|
|
sizeof(id->name)))
|
|
match = false;
|
|
|
|
if (id->version != MEI_CL_VERSION_ANY)
|
|
if (id->version != version)
|
|
match = false;
|
|
if (match)
|
|
return id;
|
|
}
|
|
|
|
id++;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* mei_cl_device_match - device match function
|
|
*
|
|
* @dev: device
|
|
* @drv: driver
|
|
*
|
|
* Return: 1 if matching device was found 0 otherwise
|
|
*/
|
|
static int mei_cl_device_match(struct device *dev, struct device_driver *drv)
|
|
{
|
|
struct mei_cl_device *cldev = to_mei_cl_device(dev);
|
|
struct mei_cl_driver *cldrv = to_mei_cl_driver(drv);
|
|
const struct mei_cl_device_id *found_id;
|
|
|
|
if (!cldev)
|
|
return 0;
|
|
|
|
if (!cldev->do_match)
|
|
return 0;
|
|
|
|
if (!cldrv || !cldrv->id_table)
|
|
return 0;
|
|
|
|
found_id = mei_cl_device_find(cldev, cldrv);
|
|
if (found_id)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* mei_cl_device_probe - bus probe function
|
|
*
|
|
* @dev: device
|
|
*
|
|
* Return: 0 on success; < 0 otherwise
|
|
*/
|
|
static int mei_cl_device_probe(struct device *dev)
|
|
{
|
|
struct mei_cl_device *cldev;
|
|
struct mei_cl_driver *cldrv;
|
|
const struct mei_cl_device_id *id;
|
|
int ret;
|
|
|
|
cldev = to_mei_cl_device(dev);
|
|
cldrv = to_mei_cl_driver(dev->driver);
|
|
|
|
if (!cldev)
|
|
return 0;
|
|
|
|
if (!cldrv || !cldrv->probe)
|
|
return -ENODEV;
|
|
|
|
id = mei_cl_device_find(cldev, cldrv);
|
|
if (!id)
|
|
return -ENODEV;
|
|
|
|
if (!mei_cl_bus_module_get(cldev)) {
|
|
dev_err(&cldev->dev, "get hw module failed");
|
|
return -ENODEV;
|
|
}
|
|
|
|
ret = cldrv->probe(cldev, id);
|
|
if (ret) {
|
|
mei_cl_bus_module_put(cldev);
|
|
return ret;
|
|
}
|
|
|
|
__module_get(THIS_MODULE);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* mei_cl_device_remove - remove device from the bus
|
|
*
|
|
* @dev: device
|
|
*
|
|
* Return: 0 on success; < 0 otherwise
|
|
*/
|
|
static int mei_cl_device_remove(struct device *dev)
|
|
{
|
|
struct mei_cl_device *cldev = to_mei_cl_device(dev);
|
|
struct mei_cl_driver *cldrv;
|
|
int ret = 0;
|
|
|
|
if (!cldev || !dev->driver)
|
|
return 0;
|
|
|
|
cldrv = to_mei_cl_driver(dev->driver);
|
|
if (cldrv->remove)
|
|
ret = cldrv->remove(cldev);
|
|
|
|
mei_cldev_unregister_callbacks(cldev);
|
|
|
|
mei_cl_bus_module_put(cldev);
|
|
module_put(THIS_MODULE);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t name_show(struct device *dev, struct device_attribute *a,
|
|
char *buf)
|
|
{
|
|
struct mei_cl_device *cldev = to_mei_cl_device(dev);
|
|
|
|
return scnprintf(buf, PAGE_SIZE, "%s", cldev->name);
|
|
}
|
|
static DEVICE_ATTR_RO(name);
|
|
|
|
static ssize_t uuid_show(struct device *dev, struct device_attribute *a,
|
|
char *buf)
|
|
{
|
|
struct mei_cl_device *cldev = to_mei_cl_device(dev);
|
|
const uuid_le *uuid = mei_me_cl_uuid(cldev->me_cl);
|
|
|
|
return sprintf(buf, "%pUl", uuid);
|
|
}
|
|
static DEVICE_ATTR_RO(uuid);
|
|
|
|
static ssize_t version_show(struct device *dev, struct device_attribute *a,
|
|
char *buf)
|
|
{
|
|
struct mei_cl_device *cldev = to_mei_cl_device(dev);
|
|
u8 version = mei_me_cl_ver(cldev->me_cl);
|
|
|
|
return sprintf(buf, "%02X", version);
|
|
}
|
|
static DEVICE_ATTR_RO(version);
|
|
|
|
static ssize_t modalias_show(struct device *dev, struct device_attribute *a,
|
|
char *buf)
|
|
{
|
|
struct mei_cl_device *cldev = to_mei_cl_device(dev);
|
|
const uuid_le *uuid = mei_me_cl_uuid(cldev->me_cl);
|
|
u8 version = mei_me_cl_ver(cldev->me_cl);
|
|
|
|
return scnprintf(buf, PAGE_SIZE, "mei:%s:%pUl:%02X:",
|
|
cldev->name, uuid, version);
|
|
}
|
|
static DEVICE_ATTR_RO(modalias);
|
|
|
|
static ssize_t max_conn_show(struct device *dev, struct device_attribute *a,
|
|
char *buf)
|
|
{
|
|
struct mei_cl_device *cldev = to_mei_cl_device(dev);
|
|
u8 maxconn = mei_me_cl_max_conn(cldev->me_cl);
|
|
|
|
return sprintf(buf, "%d", maxconn);
|
|
}
|
|
static DEVICE_ATTR_RO(max_conn);
|
|
|
|
static ssize_t fixed_show(struct device *dev, struct device_attribute *a,
|
|
char *buf)
|
|
{
|
|
struct mei_cl_device *cldev = to_mei_cl_device(dev);
|
|
u8 fixed = mei_me_cl_fixed(cldev->me_cl);
|
|
|
|
return sprintf(buf, "%d", fixed);
|
|
}
|
|
static DEVICE_ATTR_RO(fixed);
|
|
|
|
static ssize_t vtag_show(struct device *dev, struct device_attribute *a,
|
|
char *buf)
|
|
{
|
|
struct mei_cl_device *cldev = to_mei_cl_device(dev);
|
|
bool vt = mei_me_cl_vt(cldev->me_cl);
|
|
|
|
return sprintf(buf, "%d", vt);
|
|
}
|
|
static DEVICE_ATTR_RO(vtag);
|
|
|
|
static ssize_t max_len_show(struct device *dev, struct device_attribute *a,
|
|
char *buf)
|
|
{
|
|
struct mei_cl_device *cldev = to_mei_cl_device(dev);
|
|
u32 maxlen = mei_me_cl_max_len(cldev->me_cl);
|
|
|
|
return sprintf(buf, "%u", maxlen);
|
|
}
|
|
static DEVICE_ATTR_RO(max_len);
|
|
|
|
static struct attribute *mei_cldev_attrs[] = {
|
|
&dev_attr_name.attr,
|
|
&dev_attr_uuid.attr,
|
|
&dev_attr_version.attr,
|
|
&dev_attr_modalias.attr,
|
|
&dev_attr_max_conn.attr,
|
|
&dev_attr_fixed.attr,
|
|
&dev_attr_vtag.attr,
|
|
&dev_attr_max_len.attr,
|
|
NULL,
|
|
};
|
|
ATTRIBUTE_GROUPS(mei_cldev);
|
|
|
|
/**
|
|
* mei_cl_device_uevent - me client bus uevent handler
|
|
*
|
|
* @dev: device
|
|
* @env: uevent kobject
|
|
*
|
|
* Return: 0 on success -ENOMEM on when add_uevent_var fails
|
|
*/
|
|
static int mei_cl_device_uevent(struct device *dev, struct kobj_uevent_env *env)
|
|
{
|
|
struct mei_cl_device *cldev = to_mei_cl_device(dev);
|
|
const uuid_le *uuid = mei_me_cl_uuid(cldev->me_cl);
|
|
u8 version = mei_me_cl_ver(cldev->me_cl);
|
|
|
|
if (add_uevent_var(env, "MEI_CL_VERSION=%d", version))
|
|
return -ENOMEM;
|
|
|
|
if (add_uevent_var(env, "MEI_CL_UUID=%pUl", uuid))
|
|
return -ENOMEM;
|
|
|
|
if (add_uevent_var(env, "MEI_CL_NAME=%s", cldev->name))
|
|
return -ENOMEM;
|
|
|
|
if (add_uevent_var(env, "MODALIAS=mei:%s:%pUl:%02X:",
|
|
cldev->name, uuid, version))
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct bus_type mei_cl_bus_type = {
|
|
.name = "mei",
|
|
.dev_groups = mei_cldev_groups,
|
|
.match = mei_cl_device_match,
|
|
.probe = mei_cl_device_probe,
|
|
.remove = mei_cl_device_remove,
|
|
.uevent = mei_cl_device_uevent,
|
|
};
|
|
|
|
static struct mei_device *mei_dev_bus_get(struct mei_device *bus)
|
|
{
|
|
if (bus)
|
|
get_device(bus->dev);
|
|
|
|
return bus;
|
|
}
|
|
|
|
static void mei_dev_bus_put(struct mei_device *bus)
|
|
{
|
|
if (bus)
|
|
put_device(bus->dev);
|
|
}
|
|
|
|
static void mei_cl_bus_dev_release(struct device *dev)
|
|
{
|
|
struct mei_cl_device *cldev = to_mei_cl_device(dev);
|
|
|
|
if (!cldev)
|
|
return;
|
|
|
|
mei_me_cl_put(cldev->me_cl);
|
|
mei_dev_bus_put(cldev->bus);
|
|
mei_cl_unlink(cldev->cl);
|
|
kfree(cldev->cl);
|
|
kfree(cldev);
|
|
}
|
|
|
|
static const struct device_type mei_cl_device_type = {
|
|
.release = mei_cl_bus_dev_release,
|
|
};
|
|
|
|
/**
|
|
* mei_cl_bus_set_name - set device name for me client device
|
|
* <controller>-<client device>
|
|
* Example: 0000:00:16.0-55213584-9a29-4916-badf-0fb7ed682aeb
|
|
*
|
|
* @cldev: me client device
|
|
*/
|
|
static inline void mei_cl_bus_set_name(struct mei_cl_device *cldev)
|
|
{
|
|
dev_set_name(&cldev->dev, "%s-%pUl",
|
|
dev_name(cldev->bus->dev),
|
|
mei_me_cl_uuid(cldev->me_cl));
|
|
}
|
|
|
|
/**
|
|
* mei_cl_bus_dev_alloc - initialize and allocate mei client device
|
|
*
|
|
* @bus: mei device
|
|
* @me_cl: me client
|
|
*
|
|
* Return: allocated device structur or NULL on allocation failure
|
|
*/
|
|
static struct mei_cl_device *mei_cl_bus_dev_alloc(struct mei_device *bus,
|
|
struct mei_me_client *me_cl)
|
|
{
|
|
struct mei_cl_device *cldev;
|
|
struct mei_cl *cl;
|
|
|
|
cldev = kzalloc(sizeof(*cldev), GFP_KERNEL);
|
|
if (!cldev)
|
|
return NULL;
|
|
|
|
cl = mei_cl_allocate(bus);
|
|
if (!cl) {
|
|
kfree(cldev);
|
|
return NULL;
|
|
}
|
|
|
|
device_initialize(&cldev->dev);
|
|
cldev->dev.parent = bus->dev;
|
|
cldev->dev.bus = &mei_cl_bus_type;
|
|
cldev->dev.type = &mei_cl_device_type;
|
|
cldev->bus = mei_dev_bus_get(bus);
|
|
cldev->me_cl = mei_me_cl_get(me_cl);
|
|
cldev->cl = cl;
|
|
mei_cl_bus_set_name(cldev);
|
|
cldev->is_added = 0;
|
|
INIT_LIST_HEAD(&cldev->bus_list);
|
|
|
|
return cldev;
|
|
}
|
|
|
|
/**
|
|
* mei_cl_bus_dev_setup - setup me client device
|
|
* run fix up routines and set the device name
|
|
*
|
|
* @bus: mei device
|
|
* @cldev: me client device
|
|
*
|
|
* Return: true if the device is eligible for enumeration
|
|
*/
|
|
static bool mei_cl_bus_dev_setup(struct mei_device *bus,
|
|
struct mei_cl_device *cldev)
|
|
{
|
|
cldev->do_match = 1;
|
|
mei_cl_bus_dev_fixup(cldev);
|
|
|
|
/* the device name can change during fix up */
|
|
if (cldev->do_match)
|
|
mei_cl_bus_set_name(cldev);
|
|
|
|
return cldev->do_match == 1;
|
|
}
|
|
|
|
/**
|
|
* mei_cl_bus_dev_add - add me client devices
|
|
*
|
|
* @cldev: me client device
|
|
*
|
|
* Return: 0 on success; < 0 on failre
|
|
*/
|
|
static int mei_cl_bus_dev_add(struct mei_cl_device *cldev)
|
|
{
|
|
int ret;
|
|
|
|
dev_dbg(cldev->bus->dev, "adding %pUL:%02X\n",
|
|
mei_me_cl_uuid(cldev->me_cl),
|
|
mei_me_cl_ver(cldev->me_cl));
|
|
ret = device_add(&cldev->dev);
|
|
if (!ret)
|
|
cldev->is_added = 1;
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* mei_cl_bus_dev_stop - stop the driver
|
|
*
|
|
* @cldev: me client device
|
|
*/
|
|
static void mei_cl_bus_dev_stop(struct mei_cl_device *cldev)
|
|
{
|
|
if (cldev->is_added)
|
|
device_release_driver(&cldev->dev);
|
|
}
|
|
|
|
/**
|
|
* mei_cl_bus_dev_destroy - destroy me client devices object
|
|
*
|
|
* @cldev: me client device
|
|
*
|
|
* Locking: called under "dev->cl_bus_lock" lock
|
|
*/
|
|
static void mei_cl_bus_dev_destroy(struct mei_cl_device *cldev)
|
|
{
|
|
|
|
WARN_ON(!mutex_is_locked(&cldev->bus->cl_bus_lock));
|
|
|
|
if (!cldev->is_added)
|
|
return;
|
|
|
|
device_del(&cldev->dev);
|
|
|
|
list_del_init(&cldev->bus_list);
|
|
|
|
cldev->is_added = 0;
|
|
put_device(&cldev->dev);
|
|
}
|
|
|
|
/**
|
|
* mei_cl_bus_remove_device - remove a devices form the bus
|
|
*
|
|
* @cldev: me client device
|
|
*/
|
|
static void mei_cl_bus_remove_device(struct mei_cl_device *cldev)
|
|
{
|
|
mei_cl_bus_dev_stop(cldev);
|
|
mei_cl_bus_dev_destroy(cldev);
|
|
}
|
|
|
|
/**
|
|
* mei_cl_bus_remove_devices - remove all devices form the bus
|
|
*
|
|
* @bus: mei device
|
|
*/
|
|
void mei_cl_bus_remove_devices(struct mei_device *bus)
|
|
{
|
|
struct mei_cl_device *cldev, *next;
|
|
|
|
mutex_lock(&bus->cl_bus_lock);
|
|
list_for_each_entry_safe(cldev, next, &bus->device_list, bus_list)
|
|
mei_cl_bus_remove_device(cldev);
|
|
mutex_unlock(&bus->cl_bus_lock);
|
|
}
|
|
|
|
|
|
/**
|
|
* mei_cl_bus_dev_init - allocate and initializes an mei client devices
|
|
* based on me client
|
|
*
|
|
* @bus: mei device
|
|
* @me_cl: me client
|
|
*
|
|
* Locking: called under "dev->cl_bus_lock" lock
|
|
*/
|
|
static void mei_cl_bus_dev_init(struct mei_device *bus,
|
|
struct mei_me_client *me_cl)
|
|
{
|
|
struct mei_cl_device *cldev;
|
|
|
|
WARN_ON(!mutex_is_locked(&bus->cl_bus_lock));
|
|
|
|
dev_dbg(bus->dev, "initializing %pUl", mei_me_cl_uuid(me_cl));
|
|
|
|
if (me_cl->bus_added)
|
|
return;
|
|
|
|
cldev = mei_cl_bus_dev_alloc(bus, me_cl);
|
|
if (!cldev)
|
|
return;
|
|
|
|
me_cl->bus_added = true;
|
|
list_add_tail(&cldev->bus_list, &bus->device_list);
|
|
|
|
}
|
|
|
|
/**
|
|
* mei_cl_bus_rescan - scan me clients list and add create
|
|
* devices for eligible clients
|
|
*
|
|
* @bus: mei device
|
|
*/
|
|
static void mei_cl_bus_rescan(struct mei_device *bus)
|
|
{
|
|
struct mei_cl_device *cldev, *n;
|
|
struct mei_me_client *me_cl;
|
|
|
|
mutex_lock(&bus->cl_bus_lock);
|
|
|
|
down_read(&bus->me_clients_rwsem);
|
|
list_for_each_entry(me_cl, &bus->me_clients, list)
|
|
mei_cl_bus_dev_init(bus, me_cl);
|
|
up_read(&bus->me_clients_rwsem);
|
|
|
|
list_for_each_entry_safe(cldev, n, &bus->device_list, bus_list) {
|
|
|
|
if (!mei_me_cl_is_active(cldev->me_cl)) {
|
|
mei_cl_bus_remove_device(cldev);
|
|
continue;
|
|
}
|
|
|
|
if (cldev->is_added)
|
|
continue;
|
|
|
|
if (mei_cl_bus_dev_setup(bus, cldev))
|
|
mei_cl_bus_dev_add(cldev);
|
|
else {
|
|
list_del_init(&cldev->bus_list);
|
|
put_device(&cldev->dev);
|
|
}
|
|
}
|
|
mutex_unlock(&bus->cl_bus_lock);
|
|
|
|
dev_dbg(bus->dev, "rescan end");
|
|
}
|
|
|
|
void mei_cl_bus_rescan_work(struct work_struct *work)
|
|
{
|
|
struct mei_device *bus =
|
|
container_of(work, struct mei_device, bus_rescan_work);
|
|
|
|
mei_cl_bus_rescan(bus);
|
|
}
|
|
|
|
int __mei_cldev_driver_register(struct mei_cl_driver *cldrv,
|
|
struct module *owner)
|
|
{
|
|
int err;
|
|
|
|
cldrv->driver.name = cldrv->name;
|
|
cldrv->driver.owner = owner;
|
|
cldrv->driver.bus = &mei_cl_bus_type;
|
|
|
|
err = driver_register(&cldrv->driver);
|
|
if (err)
|
|
return err;
|
|
|
|
pr_debug("mei: driver [%s] registered\n", cldrv->driver.name);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(__mei_cldev_driver_register);
|
|
|
|
void mei_cldev_driver_unregister(struct mei_cl_driver *cldrv)
|
|
{
|
|
driver_unregister(&cldrv->driver);
|
|
|
|
pr_debug("mei: driver [%s] unregistered\n", cldrv->driver.name);
|
|
}
|
|
EXPORT_SYMBOL_GPL(mei_cldev_driver_unregister);
|
|
|
|
|
|
int __init mei_cl_bus_init(void)
|
|
{
|
|
return bus_register(&mei_cl_bus_type);
|
|
}
|
|
|
|
void __exit mei_cl_bus_exit(void)
|
|
{
|
|
bus_unregister(&mei_cl_bus_type);
|
|
}
|