diff options
author | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2016-01-20 14:01:31 -0300 |
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committer | André Fabian Silva Delgado <emulatorman@parabola.nu> | 2016-01-20 14:01:31 -0300 |
commit | b4b7ff4b08e691656c9d77c758fc355833128ac0 (patch) | |
tree | 82fcb00e6b918026dc9f2d1f05ed8eee83874cc0 /drivers/hwtracing/stm/dummy_stm.c | |
parent | 35acfa0fc609f2a2cd95cef4a6a9c3a5c38f1778 (diff) |
Linux-libre 4.4-gnupck-4.4-gnu
Diffstat (limited to 'drivers/hwtracing/stm/dummy_stm.c')
-rw-r--r-- | drivers/hwtracing/stm/dummy_stm.c | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/drivers/hwtracing/stm/dummy_stm.c b/drivers/hwtracing/stm/dummy_stm.c new file mode 100644 index 000000000..3709bef0b --- /dev/null +++ b/drivers/hwtracing/stm/dummy_stm.c @@ -0,0 +1,66 @@ +/* + * A dummy STM device for stm/stm_source class testing. + * Copyright (c) 2014, Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * STM class implements generic infrastructure for System Trace Module devices + * as defined in MIPI STPv2 specification. + */ + +#undef DEBUG +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/stm.h> + +static ssize_t +dummy_stm_packet(struct stm_data *stm_data, unsigned int master, + unsigned int channel, unsigned int packet, unsigned int flags, + unsigned int size, const unsigned char *payload) +{ +#ifdef DEBUG + u64 pl = 0; + + if (payload) + pl = *(u64 *)payload; + + if (size < 8) + pl &= (1ull << (size * 8)) - 1; + trace_printk("[%u:%u] [pkt: %x/%x] (%llx)\n", master, channel, + packet, size, pl); +#endif + return size; +} + +static struct stm_data dummy_stm = { + .name = "dummy_stm", + .sw_start = 0x0000, + .sw_end = 0xffff, + .sw_nchannels = 0xffff, + .packet = dummy_stm_packet, +}; + +static int dummy_stm_init(void) +{ + return stm_register_device(NULL, &dummy_stm, THIS_MODULE); +} + +static void dummy_stm_exit(void) +{ + stm_unregister_device(&dummy_stm); +} + +module_init(dummy_stm_init); +module_exit(dummy_stm_exit); + +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("dummy_stm device"); +MODULE_AUTHOR("Alexander Shishkin <alexander.shishkin@linux.intel.com>"); |