On 6 July 2015 at 04:08, Alexander Shishkin <[email protected]> wrote: > 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: Mathieu Poirier <[email protected]> > Signed-off-by: Alexander Shishkin <[email protected]> > --- > drivers/hwtracing/stm/Kconfig | 8 +++++ > drivers/hwtracing/stm/Makefile | 2 ++ > drivers/hwtracing/stm/dummy_stm.c | 66 > +++++++++++++++++++++++++++++++++++++++ > 3 files changed, 76 insertions(+) > create mode 100644 drivers/hwtracing/stm/dummy_stm.c > > diff --git a/drivers/hwtracing/stm/Kconfig b/drivers/hwtracing/stm/Kconfig > index 90ed327461..4fdb8f46d2 100644 > --- a/drivers/hwtracing/stm/Kconfig > +++ b/drivers/hwtracing/stm/Kconfig > @@ -6,3 +6,11 @@ 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" > + 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/hwtracing/stm/Makefile b/drivers/hwtracing/stm/Makefile > index adec701649..1b2725fd04 100644 > --- a/drivers/hwtracing/stm/Makefile > +++ b/drivers/hwtracing/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/hwtracing/stm/dummy_stm.c > b/drivers/hwtracing/stm/dummy_stm.c > new file mode 100644 > index 0000000000..3709bef0b2 > --- /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 <[email protected]>"); > -- > 2.1.4 >
Reviewed-by: Mathieu Poirier <[email protected]> -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
