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648 lines
18 KiB
648 lines
18 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* remote processor messaging bus |
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* |
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* Copyright (C) 2011 Texas Instruments, Inc. |
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* Copyright (C) 2011 Google, Inc. |
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* |
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* Ohad Ben-Cohen <[email protected]> |
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* Brian Swetland <[email protected]> |
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*/ |
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|
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#define pr_fmt(fmt) "%s: " fmt, __func__ |
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|
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/rpmsg.h> |
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#include <linux/of_device.h> |
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#include <linux/pm_domain.h> |
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#include <linux/slab.h> |
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#include "rpmsg_internal.h" |
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|
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/** |
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* rpmsg_create_channel() - create a new rpmsg channel |
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* using its name and address info. |
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* @rpdev: rpmsg device |
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* @chinfo: channel_info to bind |
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* |
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* Returns a pointer to the new rpmsg device on success, or NULL on error. |
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*/ |
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struct rpmsg_device *rpmsg_create_channel(struct rpmsg_device *rpdev, |
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struct rpmsg_channel_info *chinfo) |
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{ |
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if (WARN_ON(!rpdev)) |
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return NULL; |
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if (!rpdev->ops || !rpdev->ops->create_channel) { |
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dev_err(&rpdev->dev, "no create_channel ops found\n"); |
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return NULL; |
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} |
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return rpdev->ops->create_channel(rpdev, chinfo); |
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} |
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EXPORT_SYMBOL(rpmsg_create_channel); |
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/** |
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* rpmsg_release_channel() - release a rpmsg channel |
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* using its name and address info. |
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* @rpdev: rpmsg device |
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* @chinfo: channel_info to bind |
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* |
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* Returns 0 on success or an appropriate error value. |
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*/ |
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int rpmsg_release_channel(struct rpmsg_device *rpdev, |
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struct rpmsg_channel_info *chinfo) |
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{ |
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if (WARN_ON(!rpdev)) |
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return -EINVAL; |
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if (!rpdev->ops || !rpdev->ops->release_channel) { |
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dev_err(&rpdev->dev, "no release_channel ops found\n"); |
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return -ENXIO; |
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} |
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return rpdev->ops->release_channel(rpdev, chinfo); |
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} |
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EXPORT_SYMBOL(rpmsg_release_channel); |
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/** |
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* rpmsg_create_ept() - create a new rpmsg_endpoint |
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* @rpdev: rpmsg channel device |
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* @cb: rx callback handler |
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* @priv: private data for the driver's use |
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* @chinfo: channel_info with the local rpmsg address to bind with @cb |
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* |
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* Every rpmsg address in the system is bound to an rx callback (so when |
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* inbound messages arrive, they are dispatched by the rpmsg bus using the |
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* appropriate callback handler) by means of an rpmsg_endpoint struct. |
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* |
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* This function allows drivers to create such an endpoint, and by that, |
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* bind a callback, and possibly some private data too, to an rpmsg address |
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* (either one that is known in advance, or one that will be dynamically |
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* assigned for them). |
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* |
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* Simple rpmsg drivers need not call rpmsg_create_ept, because an endpoint |
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* is already created for them when they are probed by the rpmsg bus |
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* (using the rx callback provided when they registered to the rpmsg bus). |
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* |
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* So things should just work for simple drivers: they already have an |
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* endpoint, their rx callback is bound to their rpmsg address, and when |
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* relevant inbound messages arrive (i.e. messages which their dst address |
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* equals to the src address of their rpmsg channel), the driver's handler |
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* is invoked to process it. |
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* |
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* That said, more complicated drivers might need to allocate |
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* additional rpmsg addresses, and bind them to different rx callbacks. |
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* To accomplish that, those drivers need to call this function. |
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* |
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* Drivers should provide their @rpdev channel (so the new endpoint would belong |
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* to the same remote processor their channel belongs to), an rx callback |
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* function, an optional private data (which is provided back when the |
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* rx callback is invoked), and an address they want to bind with the |
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* callback. If @addr is RPMSG_ADDR_ANY, then rpmsg_create_ept will |
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* dynamically assign them an available rpmsg address (drivers should have |
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* a very good reason why not to always use RPMSG_ADDR_ANY here). |
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* |
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* Returns a pointer to the endpoint on success, or NULL on error. |
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*/ |
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struct rpmsg_endpoint *rpmsg_create_ept(struct rpmsg_device *rpdev, |
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rpmsg_rx_cb_t cb, void *priv, |
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struct rpmsg_channel_info chinfo) |
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{ |
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if (WARN_ON(!rpdev)) |
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return NULL; |
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return rpdev->ops->create_ept(rpdev, cb, priv, chinfo); |
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} |
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EXPORT_SYMBOL(rpmsg_create_ept); |
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|
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/** |
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* rpmsg_destroy_ept() - destroy an existing rpmsg endpoint |
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* @ept: endpoing to destroy |
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* |
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* Should be used by drivers to destroy an rpmsg endpoint previously |
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* created with rpmsg_create_ept(). As with other types of "free" NULL |
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* is a valid parameter. |
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*/ |
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void rpmsg_destroy_ept(struct rpmsg_endpoint *ept) |
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{ |
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if (ept && ept->ops) |
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ept->ops->destroy_ept(ept); |
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} |
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EXPORT_SYMBOL(rpmsg_destroy_ept); |
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/** |
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* rpmsg_send() - send a message across to the remote processor |
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* @ept: the rpmsg endpoint |
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* @data: payload of message |
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* @len: length of payload |
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* |
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* This function sends @data of length @len on the @ept endpoint. |
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* The message will be sent to the remote processor which the @ept |
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* endpoint belongs to, using @ept's address and its associated rpmsg |
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* device destination addresses. |
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* In case there are no TX buffers available, the function will block until |
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* one becomes available, or a timeout of 15 seconds elapses. When the latter |
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* happens, -ERESTARTSYS is returned. |
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* |
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* Can only be called from process context (for now). |
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* |
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* Returns 0 on success and an appropriate error value on failure. |
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*/ |
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int rpmsg_send(struct rpmsg_endpoint *ept, void *data, int len) |
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{ |
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if (WARN_ON(!ept)) |
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return -EINVAL; |
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if (!ept->ops->send) |
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return -ENXIO; |
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return ept->ops->send(ept, data, len); |
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} |
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EXPORT_SYMBOL(rpmsg_send); |
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/** |
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* rpmsg_sendto() - send a message across to the remote processor, specify dst |
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* @ept: the rpmsg endpoint |
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* @data: payload of message |
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* @len: length of payload |
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* @dst: destination address |
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* |
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* This function sends @data of length @len to the remote @dst address. |
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* The message will be sent to the remote processor which the @ept |
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* endpoint belongs to, using @ept's address as source. |
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* In case there are no TX buffers available, the function will block until |
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* one becomes available, or a timeout of 15 seconds elapses. When the latter |
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* happens, -ERESTARTSYS is returned. |
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* |
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* Can only be called from process context (for now). |
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* |
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* Returns 0 on success and an appropriate error value on failure. |
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*/ |
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int rpmsg_sendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst) |
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{ |
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if (WARN_ON(!ept)) |
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return -EINVAL; |
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if (!ept->ops->sendto) |
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return -ENXIO; |
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return ept->ops->sendto(ept, data, len, dst); |
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} |
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EXPORT_SYMBOL(rpmsg_sendto); |
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/** |
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* rpmsg_send_offchannel() - send a message using explicit src/dst addresses |
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* @ept: the rpmsg endpoint |
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* @src: source address |
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* @dst: destination address |
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* @data: payload of message |
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* @len: length of payload |
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* |
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* This function sends @data of length @len to the remote @dst address, |
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* and uses @src as the source address. |
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* The message will be sent to the remote processor which the @ept |
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* endpoint belongs to. |
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* In case there are no TX buffers available, the function will block until |
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* one becomes available, or a timeout of 15 seconds elapses. When the latter |
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* happens, -ERESTARTSYS is returned. |
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* |
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* Can only be called from process context (for now). |
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* |
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* Returns 0 on success and an appropriate error value on failure. |
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*/ |
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int rpmsg_send_offchannel(struct rpmsg_endpoint *ept, u32 src, u32 dst, |
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void *data, int len) |
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{ |
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if (WARN_ON(!ept)) |
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return -EINVAL; |
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if (!ept->ops->send_offchannel) |
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return -ENXIO; |
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return ept->ops->send_offchannel(ept, src, dst, data, len); |
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} |
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EXPORT_SYMBOL(rpmsg_send_offchannel); |
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/** |
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* rpmsg_trysend() - send a message across to the remote processor |
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* @ept: the rpmsg endpoint |
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* @data: payload of message |
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* @len: length of payload |
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* |
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* This function sends @data of length @len on the @ept endpoint. |
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* The message will be sent to the remote processor which the @ept |
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* endpoint belongs to, using @ept's address as source and its associated |
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* rpdev's address as destination. |
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* In case there are no TX buffers available, the function will immediately |
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* return -ENOMEM without waiting until one becomes available. |
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* |
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* Can only be called from process context (for now). |
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* |
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* Returns 0 on success and an appropriate error value on failure. |
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*/ |
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int rpmsg_trysend(struct rpmsg_endpoint *ept, void *data, int len) |
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{ |
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if (WARN_ON(!ept)) |
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return -EINVAL; |
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if (!ept->ops->trysend) |
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return -ENXIO; |
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return ept->ops->trysend(ept, data, len); |
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} |
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EXPORT_SYMBOL(rpmsg_trysend); |
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/** |
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* rpmsg_trysendto() - send a message across to the remote processor, specify dst |
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* @ept: the rpmsg endpoint |
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* @data: payload of message |
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* @len: length of payload |
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* @dst: destination address |
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* |
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* This function sends @data of length @len to the remote @dst address. |
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* The message will be sent to the remote processor which the @ept |
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* endpoint belongs to, using @ept's address as source. |
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* In case there are no TX buffers available, the function will immediately |
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* return -ENOMEM without waiting until one becomes available. |
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* |
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* Can only be called from process context (for now). |
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* |
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* Returns 0 on success and an appropriate error value on failure. |
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*/ |
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int rpmsg_trysendto(struct rpmsg_endpoint *ept, void *data, int len, u32 dst) |
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{ |
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if (WARN_ON(!ept)) |
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return -EINVAL; |
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if (!ept->ops->trysendto) |
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return -ENXIO; |
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return ept->ops->trysendto(ept, data, len, dst); |
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} |
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EXPORT_SYMBOL(rpmsg_trysendto); |
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/** |
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* rpmsg_poll() - poll the endpoint's send buffers |
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* @ept: the rpmsg endpoint |
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* @filp: file for poll_wait() |
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* @wait: poll_table for poll_wait() |
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* |
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* Returns mask representing the current state of the endpoint's send buffers |
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*/ |
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__poll_t rpmsg_poll(struct rpmsg_endpoint *ept, struct file *filp, |
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poll_table *wait) |
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{ |
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if (WARN_ON(!ept)) |
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return 0; |
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if (!ept->ops->poll) |
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return 0; |
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return ept->ops->poll(ept, filp, wait); |
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} |
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EXPORT_SYMBOL(rpmsg_poll); |
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/** |
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* rpmsg_trysend_offchannel() - send a message using explicit src/dst addresses |
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* @ept: the rpmsg endpoint |
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* @src: source address |
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* @dst: destination address |
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* @data: payload of message |
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* @len: length of payload |
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* |
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* This function sends @data of length @len to the remote @dst address, |
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* and uses @src as the source address. |
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* The message will be sent to the remote processor which the @ept |
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* endpoint belongs to. |
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* In case there are no TX buffers available, the function will immediately |
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* return -ENOMEM without waiting until one becomes available. |
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* |
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* Can only be called from process context (for now). |
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* |
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* Returns 0 on success and an appropriate error value on failure. |
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*/ |
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int rpmsg_trysend_offchannel(struct rpmsg_endpoint *ept, u32 src, u32 dst, |
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void *data, int len) |
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{ |
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if (WARN_ON(!ept)) |
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return -EINVAL; |
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if (!ept->ops->trysend_offchannel) |
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return -ENXIO; |
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return ept->ops->trysend_offchannel(ept, src, dst, data, len); |
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} |
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EXPORT_SYMBOL(rpmsg_trysend_offchannel); |
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/* |
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* match a rpmsg channel with a channel info struct. |
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* this is used to make sure we're not creating rpmsg devices for channels |
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* that already exist. |
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*/ |
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static int rpmsg_device_match(struct device *dev, void *data) |
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{ |
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struct rpmsg_channel_info *chinfo = data; |
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struct rpmsg_device *rpdev = to_rpmsg_device(dev); |
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if (chinfo->src != RPMSG_ADDR_ANY && chinfo->src != rpdev->src) |
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return 0; |
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if (chinfo->dst != RPMSG_ADDR_ANY && chinfo->dst != rpdev->dst) |
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return 0; |
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if (strncmp(chinfo->name, rpdev->id.name, RPMSG_NAME_SIZE)) |
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return 0; |
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/* found a match ! */ |
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return 1; |
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} |
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struct device *rpmsg_find_device(struct device *parent, |
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struct rpmsg_channel_info *chinfo) |
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{ |
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return device_find_child(parent, chinfo, rpmsg_device_match); |
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} |
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EXPORT_SYMBOL(rpmsg_find_device); |
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/* sysfs show configuration fields */ |
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#define rpmsg_show_attr(field, path, format_string) \ |
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static ssize_t \ |
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field##_show(struct device *dev, \ |
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struct device_attribute *attr, char *buf) \ |
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{ \ |
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struct rpmsg_device *rpdev = to_rpmsg_device(dev); \ |
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\ |
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return sprintf(buf, format_string, rpdev->path); \ |
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} \ |
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static DEVICE_ATTR_RO(field); |
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#define rpmsg_string_attr(field, member) \ |
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static ssize_t \ |
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field##_store(struct device *dev, struct device_attribute *attr, \ |
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const char *buf, size_t sz) \ |
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{ \ |
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struct rpmsg_device *rpdev = to_rpmsg_device(dev); \ |
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char *new, *old; \ |
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\ |
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new = kstrndup(buf, sz, GFP_KERNEL); \ |
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if (!new) \ |
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return -ENOMEM; \ |
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new[strcspn(new, "\n")] = '\0'; \ |
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\ |
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device_lock(dev); \ |
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old = rpdev->member; \ |
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if (strlen(new)) { \ |
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rpdev->member = new; \ |
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} else { \ |
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kfree(new); \ |
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rpdev->member = NULL; \ |
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} \ |
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device_unlock(dev); \ |
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\ |
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kfree(old); \ |
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\ |
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return sz; \ |
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} \ |
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static ssize_t \ |
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field##_show(struct device *dev, \ |
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struct device_attribute *attr, char *buf) \ |
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{ \ |
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struct rpmsg_device *rpdev = to_rpmsg_device(dev); \ |
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\ |
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return sprintf(buf, "%s\n", rpdev->member); \ |
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} \ |
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static DEVICE_ATTR_RW(field) |
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/* for more info, see Documentation/ABI/testing/sysfs-bus-rpmsg */ |
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rpmsg_show_attr(name, id.name, "%s\n"); |
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rpmsg_show_attr(src, src, "0x%x\n"); |
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rpmsg_show_attr(dst, dst, "0x%x\n"); |
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rpmsg_show_attr(announce, announce ? "true" : "false", "%s\n"); |
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rpmsg_string_attr(driver_override, driver_override); |
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static ssize_t modalias_show(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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struct rpmsg_device *rpdev = to_rpmsg_device(dev); |
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ssize_t len; |
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len = of_device_modalias(dev, buf, PAGE_SIZE); |
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if (len != -ENODEV) |
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return len; |
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return sprintf(buf, RPMSG_DEVICE_MODALIAS_FMT "\n", rpdev->id.name); |
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} |
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static DEVICE_ATTR_RO(modalias); |
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static struct attribute *rpmsg_dev_attrs[] = { |
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&dev_attr_name.attr, |
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&dev_attr_modalias.attr, |
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&dev_attr_dst.attr, |
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&dev_attr_src.attr, |
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&dev_attr_announce.attr, |
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&dev_attr_driver_override.attr, |
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NULL, |
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}; |
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ATTRIBUTE_GROUPS(rpmsg_dev); |
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/* rpmsg devices and drivers are matched using the service name */ |
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static inline int rpmsg_id_match(const struct rpmsg_device *rpdev, |
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const struct rpmsg_device_id *id) |
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{ |
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return strncmp(id->name, rpdev->id.name, RPMSG_NAME_SIZE) == 0; |
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} |
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/* match rpmsg channel and rpmsg driver */ |
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static int rpmsg_dev_match(struct device *dev, struct device_driver *drv) |
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{ |
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struct rpmsg_device *rpdev = to_rpmsg_device(dev); |
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struct rpmsg_driver *rpdrv = to_rpmsg_driver(drv); |
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const struct rpmsg_device_id *ids = rpdrv->id_table; |
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unsigned int i; |
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if (rpdev->driver_override) |
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return !strcmp(rpdev->driver_override, drv->name); |
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if (ids) |
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for (i = 0; ids[i].name[0]; i++) |
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if (rpmsg_id_match(rpdev, &ids[i])) |
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return 1; |
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return of_driver_match_device(dev, drv); |
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} |
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static int rpmsg_uevent(struct device *dev, struct kobj_uevent_env *env) |
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{ |
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struct rpmsg_device *rpdev = to_rpmsg_device(dev); |
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int ret; |
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ret = of_device_uevent_modalias(dev, env); |
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if (ret != -ENODEV) |
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return ret; |
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return add_uevent_var(env, "MODALIAS=" RPMSG_DEVICE_MODALIAS_FMT, |
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rpdev->id.name); |
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} |
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/* |
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* when an rpmsg driver is probed with a channel, we seamlessly create |
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* it an endpoint, binding its rx callback to a unique local rpmsg |
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* address. |
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* |
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* if we need to, we also announce about this channel to the remote |
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* processor (needed in case the driver is exposing an rpmsg service). |
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*/ |
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static int rpmsg_dev_probe(struct device *dev) |
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{ |
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struct rpmsg_device *rpdev = to_rpmsg_device(dev); |
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struct rpmsg_driver *rpdrv = to_rpmsg_driver(rpdev->dev.driver); |
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struct rpmsg_channel_info chinfo = {}; |
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struct rpmsg_endpoint *ept = NULL; |
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int err; |
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err = dev_pm_domain_attach(dev, true); |
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if (err) |
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goto out; |
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if (rpdrv->callback) { |
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strncpy(chinfo.name, rpdev->id.name, RPMSG_NAME_SIZE); |
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chinfo.src = rpdev->src; |
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chinfo.dst = RPMSG_ADDR_ANY; |
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|
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ept = rpmsg_create_ept(rpdev, rpdrv->callback, NULL, chinfo); |
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if (!ept) { |
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dev_err(dev, "failed to create endpoint\n"); |
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err = -ENOMEM; |
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goto out; |
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} |
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rpdev->ept = ept; |
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rpdev->src = ept->addr; |
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} |
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err = rpdrv->probe(rpdev); |
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if (err) { |
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dev_err(dev, "%s: failed: %d\n", __func__, err); |
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if (ept) |
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rpmsg_destroy_ept(ept); |
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goto out; |
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} |
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if (ept && rpdev->ops->announce_create) |
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err = rpdev->ops->announce_create(rpdev); |
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out: |
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return err; |
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} |
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|
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static int rpmsg_dev_remove(struct device *dev) |
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{ |
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struct rpmsg_device *rpdev = to_rpmsg_device(dev); |
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struct rpmsg_driver *rpdrv = to_rpmsg_driver(rpdev->dev.driver); |
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int err = 0; |
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if (rpdev->ops->announce_destroy) |
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err = rpdev->ops->announce_destroy(rpdev); |
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if (rpdrv->remove) |
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rpdrv->remove(rpdev); |
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dev_pm_domain_detach(dev, true); |
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|
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if (rpdev->ept) |
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rpmsg_destroy_ept(rpdev->ept); |
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|
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return err; |
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} |
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static struct bus_type rpmsg_bus = { |
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.name = "rpmsg", |
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.match = rpmsg_dev_match, |
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.dev_groups = rpmsg_dev_groups, |
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.uevent = rpmsg_uevent, |
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.probe = rpmsg_dev_probe, |
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.remove = rpmsg_dev_remove, |
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}; |
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|
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int rpmsg_register_device(struct rpmsg_device *rpdev) |
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{ |
|
struct device *dev = &rpdev->dev; |
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int ret; |
|
|
|
dev_set_name(&rpdev->dev, "%s.%s.%d.%d", dev_name(dev->parent), |
|
rpdev->id.name, rpdev->src, rpdev->dst); |
|
|
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rpdev->dev.bus = &rpmsg_bus; |
|
|
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ret = device_register(&rpdev->dev); |
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if (ret) { |
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dev_err(dev, "device_register failed: %d\n", ret); |
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put_device(&rpdev->dev); |
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} |
|
|
|
return ret; |
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} |
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EXPORT_SYMBOL(rpmsg_register_device); |
|
|
|
/* |
|
* find an existing channel using its name + address properties, |
|
* and destroy it |
|
*/ |
|
int rpmsg_unregister_device(struct device *parent, |
|
struct rpmsg_channel_info *chinfo) |
|
{ |
|
struct device *dev; |
|
|
|
dev = rpmsg_find_device(parent, chinfo); |
|
if (!dev) |
|
return -EINVAL; |
|
|
|
device_unregister(dev); |
|
|
|
put_device(dev); |
|
|
|
return 0; |
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} |
|
EXPORT_SYMBOL(rpmsg_unregister_device); |
|
|
|
/** |
|
* __register_rpmsg_driver() - register an rpmsg driver with the rpmsg bus |
|
* @rpdrv: pointer to a struct rpmsg_driver |
|
* @owner: owning module/driver |
|
* |
|
* Returns 0 on success, and an appropriate error value on failure. |
|
*/ |
|
int __register_rpmsg_driver(struct rpmsg_driver *rpdrv, struct module *owner) |
|
{ |
|
rpdrv->drv.bus = &rpmsg_bus; |
|
rpdrv->drv.owner = owner; |
|
return driver_register(&rpdrv->drv); |
|
} |
|
EXPORT_SYMBOL(__register_rpmsg_driver); |
|
|
|
/** |
|
* unregister_rpmsg_driver() - unregister an rpmsg driver from the rpmsg bus |
|
* @rpdrv: pointer to a struct rpmsg_driver |
|
* |
|
* Returns 0 on success, and an appropriate error value on failure. |
|
*/ |
|
void unregister_rpmsg_driver(struct rpmsg_driver *rpdrv) |
|
{ |
|
driver_unregister(&rpdrv->drv); |
|
} |
|
EXPORT_SYMBOL(unregister_rpmsg_driver); |
|
|
|
|
|
static int __init rpmsg_init(void) |
|
{ |
|
int ret; |
|
|
|
ret = bus_register(&rpmsg_bus); |
|
if (ret) |
|
pr_err("failed to register rpmsg bus: %d\n", ret); |
|
|
|
return ret; |
|
} |
|
postcore_initcall(rpmsg_init); |
|
|
|
static void __exit rpmsg_fini(void) |
|
{ |
|
bus_unregister(&rpmsg_bus); |
|
} |
|
module_exit(rpmsg_fini); |
|
|
|
MODULE_DESCRIPTION("remote processor messaging bus"); |
|
MODULE_LICENSE("GPL v2");
|
|
|