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1338 lines
28 KiB
1338 lines
28 KiB
// 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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|
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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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|
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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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/** |
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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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|
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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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|
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mutex_lock(&bus->device_lock); |
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if (bus->dev_state != MEI_DEV_ENABLED && |
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bus->dev_state != MEI_DEV_POWERING_DOWN) { |
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rets = -ENODEV; |
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goto out; |
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} |
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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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/* 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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|
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if (vtag) { |
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/* Check if vtag is supported by client */ |
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rets = mei_cl_vt_support_check(cl); |
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if (rets) |
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goto out; |
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} |
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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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|
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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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|
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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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bus->dev_state != MEI_DEV_POWERING_DOWN) { |
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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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/** |
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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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/** |
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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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* 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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* |
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* @cldev: mei client device |
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* |
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* Return: true if me client is initialized and connected |
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*/ |
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bool mei_cldev_enabled(struct mei_cl_device *cldev) |
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{ |
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return mei_cl_is_connected(cldev->cl); |
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} |
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EXPORT_SYMBOL_GPL(mei_cldev_enabled); |
|
|
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/** |
|
* mei_cl_bus_module_get - acquire module of the underlying |
|
* hw driver. |
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* |
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* @cldev: mei client device |
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* |
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* Return: true on success; false if the module was removed. |
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*/ |
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static bool mei_cl_bus_module_get(struct mei_cl_device *cldev) |
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{ |
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return try_module_get(cldev->bus->dev->driver->owner); |
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} |
|
|
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/** |
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* mei_cl_bus_module_put - release the underlying hw module. |
|
* |
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* @cldev: mei client device |
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*/ |
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static void mei_cl_bus_module_put(struct mei_cl_device *cldev) |
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{ |
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module_put(cldev->bus->dev->driver->owner); |
|
} |
|
|
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/** |
|
* mei_cl_bus_vtag - get bus vtag entry wrapper |
|
* The tag for bus client is always first. |
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* |
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* @cl: host client |
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* |
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* 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 = to_mei_cl_driver(dev->driver); |
|
|
|
if (cldrv->remove) |
|
cldrv->remove(cldev); |
|
|
|
mei_cldev_unregister_callbacks(cldev); |
|
|
|
mei_cl_bus_module_put(cldev); |
|
module_put(THIS_MODULE); |
|
|
|
return 0; |
|
} |
|
|
|
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 |
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* |
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* @bus: mei device |
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*/ |
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void mei_cl_bus_remove_devices(struct mei_device *bus) |
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{ |
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struct mei_cl_device *cldev, *next; |
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mutex_lock(&bus->cl_bus_lock); |
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list_for_each_entry_safe(cldev, next, &bus->device_list, bus_list) |
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mei_cl_bus_remove_device(cldev); |
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mutex_unlock(&bus->cl_bus_lock); |
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} |
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/** |
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* mei_cl_bus_dev_init - allocate and initializes an mei client devices |
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* based on me client |
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* |
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* @bus: mei device |
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* @me_cl: me client |
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* |
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* Locking: called under "dev->cl_bus_lock" lock |
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*/ |
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static void mei_cl_bus_dev_init(struct mei_device *bus, |
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struct mei_me_client *me_cl) |
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{ |
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struct mei_cl_device *cldev; |
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WARN_ON(!mutex_is_locked(&bus->cl_bus_lock)); |
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dev_dbg(bus->dev, "initializing %pUl", mei_me_cl_uuid(me_cl)); |
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if (me_cl->bus_added) |
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return; |
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cldev = mei_cl_bus_dev_alloc(bus, me_cl); |
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if (!cldev) |
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return; |
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me_cl->bus_added = true; |
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list_add_tail(&cldev->bus_list, &bus->device_list); |
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} |
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/** |
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* mei_cl_bus_rescan - scan me clients list and add create |
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* devices for eligible clients |
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* |
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* @bus: mei device |
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*/ |
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static void mei_cl_bus_rescan(struct mei_device *bus) |
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{ |
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struct mei_cl_device *cldev, *n; |
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struct mei_me_client *me_cl; |
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mutex_lock(&bus->cl_bus_lock); |
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down_read(&bus->me_clients_rwsem); |
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list_for_each_entry(me_cl, &bus->me_clients, list) |
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mei_cl_bus_dev_init(bus, me_cl); |
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up_read(&bus->me_clients_rwsem); |
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list_for_each_entry_safe(cldev, n, &bus->device_list, bus_list) { |
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if (!mei_me_cl_is_active(cldev->me_cl)) { |
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mei_cl_bus_remove_device(cldev); |
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continue; |
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} |
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if (cldev->is_added) |
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continue; |
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if (mei_cl_bus_dev_setup(bus, cldev)) |
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mei_cl_bus_dev_add(cldev); |
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else { |
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list_del_init(&cldev->bus_list); |
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put_device(&cldev->dev); |
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} |
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} |
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mutex_unlock(&bus->cl_bus_lock); |
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dev_dbg(bus->dev, "rescan end"); |
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} |
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void mei_cl_bus_rescan_work(struct work_struct *work) |
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{ |
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struct mei_device *bus = |
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container_of(work, struct mei_device, bus_rescan_work); |
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mei_cl_bus_rescan(bus); |
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} |
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int __mei_cldev_driver_register(struct mei_cl_driver *cldrv, |
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struct module *owner) |
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{ |
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int err; |
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cldrv->driver.name = cldrv->name; |
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cldrv->driver.owner = owner; |
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cldrv->driver.bus = &mei_cl_bus_type; |
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err = driver_register(&cldrv->driver); |
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if (err) |
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return err; |
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pr_debug("mei: driver [%s] registered\n", cldrv->driver.name); |
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(__mei_cldev_driver_register); |
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void mei_cldev_driver_unregister(struct mei_cl_driver *cldrv) |
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{ |
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driver_unregister(&cldrv->driver); |
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pr_debug("mei: driver [%s] unregistered\n", cldrv->driver.name); |
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} |
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EXPORT_SYMBOL_GPL(mei_cldev_driver_unregister); |
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int __init mei_cl_bus_init(void) |
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{ |
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return bus_register(&mei_cl_bus_type); |
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} |
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void __exit mei_cl_bus_exit(void) |
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{ |
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bus_unregister(&mei_cl_bus_type); |
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}
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