forked from mirrors/linux
a02509f301
The STP framing pattern that the stm class implicitly applies to the data payload is, in fact, a protocol. This patch moves the relevant code out of the stm core into its own driver module. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Tested-by: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
48 lines
1.1 KiB
C
48 lines
1.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Basic framing protocol for STM devices.
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* Copyright (c) 2018, Intel Corporation.
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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/stm.h>
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#include "stm.h"
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static ssize_t basic_write(struct stm_data *data, struct stm_output *output,
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unsigned int chan, const char *buf, size_t count)
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{
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unsigned int c = output->channel + chan;
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unsigned int m = output->master;
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const unsigned char nil = 0;
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ssize_t sz;
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sz = stm_data_write(data, m, c, true, buf, count);
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if (sz > 0)
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data->packet(data, m, c, STP_PACKET_FLAG, 0, 0, &nil);
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return sz;
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}
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static const struct stm_protocol_driver basic_pdrv = {
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.owner = THIS_MODULE,
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.name = "p_basic",
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.write = basic_write,
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};
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static int basic_stm_init(void)
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{
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return stm_register_protocol(&basic_pdrv);
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}
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static void basic_stm_exit(void)
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{
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stm_unregister_protocol(&basic_pdrv);
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}
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module_init(basic_stm_init);
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module_exit(basic_stm_exit);
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MODULE_LICENSE("GPL v2");
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MODULE_DESCRIPTION("Basic STM framing protocol driver");
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MODULE_AUTHOR("Alexander Shishkin <alexander.shishkin@linux.intel.com>");
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