| Alexander Shishkin | 2c41538 | 2015-09-22 15:47:12 +0300 | [diff] [blame^] | 1 | /* |
| 2 | * A dummy STM device for stm/stm_source class testing. |
| 3 | * Copyright (c) 2014, Intel Corporation. |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify it |
| 6 | * under the terms and conditions of the GNU General Public License, |
| 7 | * version 2, as published by the Free Software Foundation. |
| 8 | * |
| 9 | * This program is distributed in the hope it will be useful, but WITHOUT |
| 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 12 | * more details. |
| 13 | * |
| 14 | * STM class implements generic infrastructure for System Trace Module devices |
| 15 | * as defined in MIPI STPv2 specification. |
| 16 | */ |
| 17 | |
| 18 | #undef DEBUG |
| 19 | #include <linux/kernel.h> |
| 20 | #include <linux/module.h> |
| 21 | #include <linux/slab.h> |
| 22 | #include <linux/stm.h> |
| 23 | |
| 24 | static ssize_t |
| 25 | dummy_stm_packet(struct stm_data *stm_data, unsigned int master, |
| 26 | unsigned int channel, unsigned int packet, unsigned int flags, |
| 27 | unsigned int size, const unsigned char *payload) |
| 28 | { |
| 29 | #ifdef DEBUG |
| 30 | u64 pl = 0; |
| 31 | |
| 32 | if (payload) |
| 33 | pl = *(u64 *)payload; |
| 34 | |
| 35 | if (size < 8) |
| 36 | pl &= (1ull << (size * 8)) - 1; |
| 37 | trace_printk("[%u:%u] [pkt: %x/%x] (%llx)\n", master, channel, |
| 38 | packet, size, pl); |
| 39 | #endif |
| 40 | return size; |
| 41 | } |
| 42 | |
| 43 | static struct stm_data dummy_stm = { |
| 44 | .name = "dummy_stm", |
| 45 | .sw_start = 0x0000, |
| 46 | .sw_end = 0xffff, |
| 47 | .sw_nchannels = 0xffff, |
| 48 | .packet = dummy_stm_packet, |
| 49 | }; |
| 50 | |
| 51 | static int dummy_stm_init(void) |
| 52 | { |
| 53 | return stm_register_device(NULL, &dummy_stm, THIS_MODULE); |
| 54 | } |
| 55 | |
| 56 | static void dummy_stm_exit(void) |
| 57 | { |
| 58 | stm_unregister_device(&dummy_stm); |
| 59 | } |
| 60 | |
| 61 | module_init(dummy_stm_init); |
| 62 | module_exit(dummy_stm_exit); |
| 63 | |
| 64 | MODULE_LICENSE("GPL v2"); |
| 65 | MODULE_DESCRIPTION("dummy_stm device"); |
| 66 | MODULE_AUTHOR("Alexander Shishkin <alexander.shishkin@linux.intel.com>"); |