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mcb: export bus information via sysfs 

Export information about the bus stored in the FPGA's header to userspace via
sysfs, instead of hiding it in pr_debug()s from everyone.

Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
Reviewed-by: Andreas Werner <andreas.werner@men.de>
Tested-by: Andreas Werner <andreas.werner@men.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johannes Thumshirn 2016-05-03 09:46:23 +02:00 committed by Greg Kroah-Hartman
parent 18d2881980
commit 803f1ca60d
5 changed files with 103 additions and 11 deletions
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29
Documentation/ABI/testing/sysfs-bus-mcb Normal file
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@ -0,0 +1,29 @@
What: /sys/bus/mcb/devices/mcb:X
Date: March 2016
KernelVersion: 4.7
Contact: Johannes Thumshirn <jth@kernel.org>
Description: Hardware chip or device hosting the MEN chameleon bus
What: /sys/bus/mcb/devices/mcb:X/revision
Date: March 2016
KernelVersion: 4.7
Contact: Johannes Thumshirn <jth@kernel.org>
Description: The FPGA's revision number
What: /sys/bus/mcb/devices/mcb:X/minor
Date: March 2016
KernelVersion: 4.7
Contact: Johannes Thumshirn <jth@kernel.org>
Description: The FPGA's minor number
What: /sys/bus/mcb/devices/mcb:X/model
Date: March 2016
KernelVersion: 4.7
Contact: Johannes Thumshirn <jth@kernel.org>
Description: The FPGA's model number
What: /sys/bus/mcb/devices/mcb:X/name
Date: March 2016
KernelVersion: 4.7
Contact: Johannes Thumshirn <jth@kernel.org>
Description: The FPGA's name

60
drivers/mcb/mcb-core.c
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@ -90,6 +90,60 @@ static void mcb_shutdown(struct device *dev)
mdrv->shutdown(mdev);
}
static ssize_t revision_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct mcb_bus *bus = to_mcb_bus(dev);
return scnprintf(buf, PAGE_SIZE, "%d\n", bus->revision);
}
static DEVICE_ATTR_RO(revision);
static ssize_t model_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct mcb_bus *bus = to_mcb_bus(dev);
return scnprintf(buf, PAGE_SIZE, "%c\n", bus->model);
}
static DEVICE_ATTR_RO(model);
static ssize_t minor_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct mcb_bus *bus = to_mcb_bus(dev);
return scnprintf(buf, PAGE_SIZE, "%d\n", bus->minor);
}
static DEVICE_ATTR_RO(minor);
static ssize_t name_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct mcb_bus *bus = to_mcb_bus(dev);
return scnprintf(buf, PAGE_SIZE, "%s\n", bus->name);
}
static DEVICE_ATTR_RO(name);
static struct attribute *mcb_bus_attrs[] = {
&dev_attr_revision.attr,
&dev_attr_model.attr,
&dev_attr_minor.attr,
&dev_attr_name.attr,
NULL,
};
static const struct attribute_group mcb_carrier_group = {
.attrs = mcb_bus_attrs,
};
static const struct attribute_group *mcb_carrier_groups[] = {
&mcb_carrier_group,
NULL,
};
static struct bus_type mcb_bus_type = {
.name = "mcb",
.match = mcb_match,
@ -99,6 +153,11 @@ static struct bus_type mcb_bus_type = {
.shutdown = mcb_shutdown,
};
static struct device_type mcb_carrier_device_type = {
.name = "mcb-carrier",
.groups = mcb_carrier_groups,
};
/**
* __mcb_register_driver() - Register a @mcb_driver at the system
* @drv: The @mcb_driver
@ -205,6 +264,7 @@ struct mcb_bus *mcb_alloc_bus(struct device *carrier)
device_initialize(&bus->dev);
bus->dev.parent = carrier;
bus->dev.bus = &mcb_bus_type;
bus->dev.type = &mcb_carrier_device_type;
dev_set_name(&bus->dev, "mcb:%d", bus_nr);
rc = device_add(&bus->dev);

1
drivers/mcb/mcb-internal.h
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@ -5,7 +5,6 @@
#define PCI_VENDOR_ID_MEN 0x1a88
#define PCI_DEVICE_ID_MEN_CHAMELEON 0x4d45
#define CHAMELEON_FILENAME_LEN 12
#define CHAMELEONV2_MAGIC 0xabce
#define CHAM_HEADER_SIZE 0x200

15
drivers/mcb/mcb-parse.c
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@ -113,16 +113,11 @@ int chameleon_parse_cells(struct mcb_bus *bus, phys_addr_t mapbase,
}
p += hsize;
pr_debug("header->revision = %d\n", header->revision);
pr_debug("header->model = 0x%x ('%c')\n", header->model,
header->model);
pr_debug("header->minor = %d\n", header->minor);
pr_debug("header->bus_type = 0x%x\n", header->bus_type);
pr_debug("header->magic = 0x%x\n", header->magic);
pr_debug("header->filename = \"%.*s\"\n", CHAMELEON_FILENAME_LEN,
header->filename);
bus->revision = header->revision;
bus->model = header->model;
bus->minor = header->minor;
snprintf(bus->name, CHAMELEON_FILENAME_LEN + 1, "%s",
header->filename);
for_each_chameleon_cell(dtype, p) {
switch (dtype) {

9
include/linux/mcb.h
View File

@ -15,6 +15,8 @@
#include <linux/device.h>
#include <linux/irqreturn.h>
#define CHAMELEON_FILENAME_LEN 12
struct mcb_driver;
struct mcb_device;
@ -25,11 +27,18 @@ struct mcb_device;
* @carrier: pointer to carrier device
* @bus_nr: mcb bus number
* @get_irq: callback to get IRQ number
* @revision: the FPGA's revision number
* @model: the FPGA's model number
* @filename: the FPGA's name
*/
struct mcb_bus {
struct device dev;
struct device *carrier;
int bus_nr;
u8 revision;
char model;
u8 minor;
char name[CHAMELEON_FILENAME_LEN + 1];
int (*get_irq)(struct mcb_device *dev);
};
#define to_mcb_bus(b) container_of((b), struct mcb_bus, dev)