Messages in this thread Patch in this message | | | From | Alexander Shishkin <> | Subject | [PATCH v0 03/11] stm class: dummy_stm: Add dummy driver for testing stm class | Date | Sat, 7 Mar 2015 13:35:53 +0200 |
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This is a simple module that pretends to be an stm device and discards all the data that comes in. Useful for testing stm class and its users.
Cc: Pratik Patel <pratikp@codeaurora.org> Cc: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> --- drivers/stm/Kconfig | 9 ++++++++ drivers/stm/Makefile | 2 ++ drivers/stm/dummy_stm.c | 60 +++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 71 insertions(+) create mode 100644 drivers/stm/dummy_stm.c
diff --git a/drivers/stm/Kconfig b/drivers/stm/Kconfig index 90ed327461..cb3a0d3c4c 100644 --- a/drivers/stm/Kconfig +++ b/drivers/stm/Kconfig @@ -6,3 +6,12 @@ config STM Examples of such devices are Intel Trace Hub and Coresight STM. Say Y here to enable System Trace Module device support. + +config STM_DUMMY + tristate "Dummy STM driver" + default N + help + This is a simple dummy device that pretends to be an stm device + and discards your data. Use for stm class testing. + + If you don't know what this is, say N. diff --git a/drivers/stm/Makefile b/drivers/stm/Makefile index adec701649..1b2725fd04 100644 --- a/drivers/stm/Makefile +++ b/drivers/stm/Makefile @@ -1,3 +1,5 @@ obj-$(CONFIG_STM) += stm_core.o stm_core-y := core.o policy.o + +obj-$(CONFIG_STM_DUMMY) += dummy_stm.o diff --git a/drivers/stm/dummy_stm.c b/drivers/stm/dummy_stm.c new file mode 100644 index 0000000000..40bfb7db56 --- /dev/null +++ b/drivers/stm/dummy_stm.c @@ -0,0 +1,60 @@ +/* + * 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. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/stm.h> + +static ssize_t +dummy_stm_write(struct stm_data *stm_data, unsigned int master, + unsigned int channel, const char *buf, size_t count) +{ +#ifdef DEBUG + char *s = kstrndup(buf, count, GFP_ATOMIC); + + trace_printk("[%u:%u] [%s] (%lu)\n", master, channel, s, count); + kfree(s); +#endif + + return count; +} + +static struct stm_data dummy_stm = { + .name = "dummy_stm", + .sw_start = 0x0000, + .sw_end = 0xffff, + .sw_nchannels = 0xffff, + .write = dummy_stm_write, +}; + +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>"); -- 2.1.4
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