863dbc52e7
Now that the SPDX tag is in all greybus files, that identifies the license in a specific and legally-defined manner. So the extra GPL text wording can be removed as it is no longer needed at all. This is done on a quest to remove the 700+ different ways that files in the kernel describe the GPL license text. And there's unneeded stuff like the address (sometimes incorrect) for the FSF which is never needed. No copyright headers or other non-license-description text was removed. Cc: Vaibhav Hiremath <hvaibhav.linux@gmail.com> Reviewed-by: Alex Elder <elder@linaro.org> Acked-by: Vaibhav Agarwal <vaibhav.sr@gmail.com> Acked-by: David Lin <dtwlin@gmail.com> Acked-by: Johan Hovold <johan@kernel.org> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Acked-by: Mark Greer <mgreer@animalcreek.com> Acked-by: Rui Miguel Silva <rmfrfs@gmail.com> Acked-by: "Bryan O'Donoghue" <pure.logic@nexus-software.ie> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
134 lines
3 KiB
C
134 lines
3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Greybus driver for the log protocol
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*
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* Copyright 2016 Google Inc.
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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/slab.h>
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#include <linux/sizes.h>
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#include <linux/uaccess.h>
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#include "greybus.h"
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struct gb_log {
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struct gb_connection *connection;
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};
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static int gb_log_request_handler(struct gb_operation *op)
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{
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struct gb_connection *connection = op->connection;
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struct device *dev = &connection->bundle->dev;
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struct gb_log_send_log_request *receive;
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u16 len;
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if (op->type != GB_LOG_TYPE_SEND_LOG) {
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dev_err(dev, "unknown request type 0x%02x\n", op->type);
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return -EINVAL;
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}
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/* Verify size of payload */
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if (op->request->payload_size < sizeof(*receive)) {
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dev_err(dev, "log request too small (%zu < %zu)\n",
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op->request->payload_size, sizeof(*receive));
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return -EINVAL;
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}
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receive = op->request->payload;
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len = le16_to_cpu(receive->len);
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if (len != (op->request->payload_size - sizeof(*receive))) {
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dev_err(dev, "log request wrong size %d vs %zu\n", len,
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(op->request->payload_size - sizeof(*receive)));
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return -EINVAL;
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}
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if (len == 0) {
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dev_err(dev, "log request of 0 bytes?\n");
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return -EINVAL;
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}
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if (len > GB_LOG_MAX_LEN) {
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dev_err(dev, "log request too big: %d\n", len);
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return -EINVAL;
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}
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/* Ensure the buffer is 0 terminated */
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receive->msg[len - 1] = '\0';
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/*
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* Print with dev_dbg() so that it can be easily turned off using
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* dynamic debugging (and prevent any DoS)
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*/
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dev_dbg(dev, "%s", receive->msg);
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return 0;
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}
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static int gb_log_probe(struct gb_bundle *bundle,
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const struct greybus_bundle_id *id)
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{
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struct greybus_descriptor_cport *cport_desc;
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struct gb_connection *connection;
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struct gb_log *log;
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int retval;
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if (bundle->num_cports != 1)
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return -ENODEV;
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cport_desc = &bundle->cport_desc[0];
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if (cport_desc->protocol_id != GREYBUS_PROTOCOL_LOG)
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return -ENODEV;
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log = kzalloc(sizeof(*log), GFP_KERNEL);
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if (!log)
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return -ENOMEM;
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connection = gb_connection_create(bundle, le16_to_cpu(cport_desc->id),
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gb_log_request_handler);
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if (IS_ERR(connection)) {
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retval = PTR_ERR(connection);
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goto error_free;
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}
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log->connection = connection;
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greybus_set_drvdata(bundle, log);
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retval = gb_connection_enable(connection);
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if (retval)
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goto error_connection_destroy;
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return 0;
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error_connection_destroy:
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gb_connection_destroy(connection);
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error_free:
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kfree(log);
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return retval;
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}
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static void gb_log_disconnect(struct gb_bundle *bundle)
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{
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struct gb_log *log = greybus_get_drvdata(bundle);
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struct gb_connection *connection = log->connection;
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gb_connection_disable(connection);
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gb_connection_destroy(connection);
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kfree(log);
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}
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static const struct greybus_bundle_id gb_log_id_table[] = {
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{ GREYBUS_DEVICE_CLASS(GREYBUS_CLASS_LOG) },
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{ }
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};
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MODULE_DEVICE_TABLE(greybus, gb_log_id_table);
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static struct greybus_driver gb_log_driver = {
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.name = "log",
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.probe = gb_log_probe,
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.disconnect = gb_log_disconnect,
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.id_table = gb_log_id_table,
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};
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module_greybus_driver(gb_log_driver);
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MODULE_LICENSE("GPL v2");
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