stm class: Factor out default framing protocol (a02509f3) · Commits · 戴 / test

drivers/hwtracing/stm/Kconfig

+15 −0

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		@@ -11,6 +11,21 @@ config STM

		if STM

		config STM_PROTO_BASIC
		tristate "Basic STM framing protocol driver"
		default CONFIG_STM
		help
		This is a simple framing protocol for sending data over STM
		devices. This was the protocol that the STM framework used
		exclusively until the MIPI SyS-T support was added. Use this
		driver for compatibility with your existing STM setup.

		The receiving side only needs to be able to decode the MIPI
		STP protocol in order to extract the data.

		If you want to be able to use the basic protocol or want the
		backwards compatibility for your existing setup, say Y.

		config STM_DUMMY
		tristate "Dummy STM driver"
		help

+4 −0

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		@@ -3,6 +3,10 @@ obj-$(CONFIG_STM) += stm_core.o

		stm_core-y := core.o policy.o

		obj-$(CONFIG_STM_PROTO_BASIC) += stm_p_basic.o

		stm_p_basic-y := p_basic.o

		obj-$(CONFIG_STM_DUMMY) += dummy_stm.o

		obj-$(CONFIG_STM_SOURCE_CONSOLE) += stm_console.o

0 → 100644

+48 −0

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		// SPDX-License-Identifier: GPL-2.0
		/*
		* Basic framing protocol for STM devices.
		* Copyright (c) 2018, Intel Corporation.
		*/

		#include <linux/module.h>
		#include <linux/device.h>
		#include <linux/stm.h>
		#include "stm.h"

		static ssize_t basic_write(struct stm_data data, struct stm_output output,
		unsigned int chan, const char *buf, size_t count)
		{
		unsigned int c = output->channel + chan;
		unsigned int m = output->master;
		const unsigned char nil = 0;
		ssize_t sz;

		sz = stm_data_write(data, m, c, true, buf, count);
		if (sz > 0)
		data->packet(data, m, c, STP_PACKET_FLAG, 0, 0, &nil);

		return sz;
		}

		static const struct stm_protocol_driver basic_pdrv = {
		.owner = THIS_MODULE,
		.name = "p_basic",
		.write = basic_write,
		};

		static int basic_stm_init(void)
		{
		return stm_register_protocol(&basic_pdrv);
		}

		static void basic_stm_exit(void)
		{
		stm_unregister_protocol(&basic_pdrv);
		}

		module_init(basic_stm_init);
		module_exit(basic_stm_exit);

		MODULE_LICENSE("GPL v2");
		MODULE_DESCRIPTION("Basic STM framing protocol driver");
		MODULE_AUTHOR("Alexander Shishkin <alexander.shishkin@linux.intel.com>");