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path: root/drivers/hwtracing/stm/dummy_stm.c
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Diffstat (limited to 'drivers/hwtracing/stm/dummy_stm.c')
-rw-r--r--drivers/hwtracing/stm/dummy_stm.c34
1 files changed, 22 insertions, 12 deletions
diff --git a/drivers/hwtracing/stm/dummy_stm.c b/drivers/hwtracing/stm/dummy_stm.c
index c5f94ca31c4d..38528ffdc0b3 100644
--- a/drivers/hwtracing/stm/dummy_stm.c
+++ b/drivers/hwtracing/stm/dummy_stm.c
@@ -1,16 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0
/*
* 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.
*/
@@ -20,6 +12,7 @@
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/stm.h>
+#include <uapi/linux/stm.h>
static ssize_t notrace
dummy_stm_packet(struct stm_data *stm_data, unsigned int master,
@@ -52,6 +45,18 @@ static unsigned int fail_mode;
module_param(fail_mode, int, 0600);
+static unsigned int master_min;
+
+module_param(master_min, int, 0400);
+
+static unsigned int master_max = STP_MASTER_MAX;
+
+module_param(master_max, int, 0400);
+
+static unsigned int nr_channels = STP_CHANNEL_MAX;
+
+module_param(nr_channels, int, 0400);
+
static int dummy_stm_link(struct stm_data *data, unsigned int master,
unsigned int channel)
{
@@ -68,14 +73,19 @@ static int dummy_stm_init(void)
if (nr_dummies < 0 || nr_dummies > DUMMY_STM_MAX)
return -EINVAL;
+ if (master_min > master_max ||
+ master_max > STP_MASTER_MAX ||
+ nr_channels > STP_CHANNEL_MAX)
+ return -EINVAL;
+
for (i = 0; i < nr_dummies; i++) {
dummy_stm[i].name = kasprintf(GFP_KERNEL, "dummy_stm.%d", i);
if (!dummy_stm[i].name)
goto fail_unregister;
- dummy_stm[i].sw_start = 0x0000;
- dummy_stm[i].sw_end = 0xffff;
- dummy_stm[i].sw_nchannels = 0xffff;
+ dummy_stm[i].sw_start = master_min;
+ dummy_stm[i].sw_end = master_max;
+ dummy_stm[i].sw_nchannels = nr_channels;
dummy_stm[i].packet = dummy_stm_packet;
dummy_stm[i].link = dummy_stm_link;