drivers/tee/optee/rpc.c

Source file repositories/reference/linux-study-clean/drivers/tee/optee/rpc.c

File Facts

System
Linux kernel
Corpus path
drivers/tee/optee/rpc.c
Extension
.c
Size
11548 bytes
Lines
461
Domain
Driver Families
Bucket
drivers/tee
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2015-2021, Linaro Limited
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/rpmb.h>
#include <linux/slab.h>
#include <linux/tee_core.h>
#include "optee_private.h"
#include "optee_rpc_cmd.h"

static void handle_rpc_func_cmd_get_time(struct optee_msg_arg *arg)
{
	struct timespec64 ts;

	if (arg->num_params != 1)
		goto bad;
	if ((arg->params[0].attr & OPTEE_MSG_ATTR_TYPE_MASK) !=
			OPTEE_MSG_ATTR_TYPE_VALUE_OUTPUT)
		goto bad;

	ktime_get_real_ts64(&ts);
	arg->params[0].u.value.a = ts.tv_sec;
	arg->params[0].u.value.b = ts.tv_nsec;

	arg->ret = TEEC_SUCCESS;
	return;
bad:
	arg->ret = TEEC_ERROR_BAD_PARAMETERS;
}

#if IS_REACHABLE(CONFIG_I2C)
static void handle_rpc_func_cmd_i2c_transfer(struct tee_context *ctx,
					     struct optee_msg_arg *arg)
{
	struct optee *optee = tee_get_drvdata(ctx->teedev);
	struct tee_param *params;
	struct i2c_adapter *adapter;
	struct i2c_msg msg = { };
	size_t i;
	int ret = -EOPNOTSUPP;
	static const u8 attr[] = {
		TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT,
		TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_INPUT,
		TEE_IOCTL_PARAM_ATTR_TYPE_MEMREF_INOUT,
		TEE_IOCTL_PARAM_ATTR_TYPE_VALUE_OUTPUT,
	};

	if (arg->num_params != ARRAY_SIZE(attr)) {
		arg->ret = TEEC_ERROR_BAD_PARAMETERS;
		return;
	}

	params = kmalloc_objs(struct tee_param, arg->num_params);
	if (!params) {
		arg->ret = TEEC_ERROR_OUT_OF_MEMORY;
		return;
	}

	if (optee->ops->from_msg_param(optee, params, arg->num_params,
				       arg->params))
		goto bad;

	for (i = 0; i < arg->num_params; i++) {
		if (params[i].attr != attr[i])
			goto bad;
	}

	adapter = i2c_get_adapter(params[0].u.value.b);
	if (!adapter)
		goto bad;

	if (params[1].u.value.a & OPTEE_RPC_I2C_FLAGS_TEN_BIT) {
		if (!i2c_check_functionality(adapter,
					     I2C_FUNC_10BIT_ADDR)) {
			i2c_put_adapter(adapter);
			goto bad;
		}

		msg.flags = I2C_M_TEN;
	}

	msg.addr = params[0].u.value.c;
	msg.buf  = params[2].u.memref.shm->kaddr;
	msg.len  = params[2].u.memref.size;

Annotation

Implementation Notes