1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Basic framing protocol for STM devices. 4 * Copyright (c) 2018, Intel Corporation. 5 */ 6 7 #include <linux/module.h> 8 #include <linux/device.h> 9 #include <linux/stm.h> 10 #include "stm.h" 11 12 static ssize_t basic_write(struct stm_data *data, struct stm_output *output, 13 unsigned int chan, const char *buf, size_t count) 14 { 15 unsigned int c = output->channel + chan; 16 unsigned int m = output->master; 17 const unsigned char nil = 0; 18 ssize_t sz; 19 20 sz = stm_data_write(data, m, c, true, buf, count); 21 if (sz > 0) 22 data->packet(data, m, c, STP_PACKET_FLAG, 0, 0, &nil); 23 24 return sz; 25 } 26 27 static const struct stm_protocol_driver basic_pdrv = { 28 .owner = THIS_MODULE, 29 .name = "p_basic", 30 .write = basic_write, 31 }; 32 33 static int basic_stm_init(void) 34 { 35 return stm_register_protocol(&basic_pdrv); 36 } 37 38 static void basic_stm_exit(void) 39 { 40 stm_unregister_protocol(&basic_pdrv); 41 } 42 43 module_init(basic_stm_init); 44 module_exit(basic_stm_exit); 45 46 MODULE_LICENSE("GPL v2"); 47 MODULE_DESCRIPTION("Basic STM framing protocol driver"); 48 MODULE_AUTHOR("Alexander Shishkin <alexander.shishkin@linux.intel.com>"); 49