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authorSakari Ailus <sakari.ailus@linux.intel.com>2019-10-03 15:32:18 +0300
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2019-10-11 11:26:55 +0200
commit3bd32d6a2ee62db3c5b06caf7b163b6a4d459ea1 (patch)
treed3252ed3c0a5bc4043d88766f08ab3fee374f438 /lib/vsprintf.c
parent83abc5a77f3b028b8c845c39ce4053119e1de35b (diff)
downloadlinux-3bd32d6a2ee62db3c5b06caf7b163b6a4d459ea1.tar.bz2
lib/vsprintf: Add %pfw conversion specifier for printing fwnode names
Add support for %pfw conversion specifier (with "f" and "P" modifiers) to support printing full path of the node, including its name ("f") and only the node's name ("P") in the printk family of functions. The two flags have equivalent functionality to existing %pOF with the same two modifiers ("f" and "P") on OF based systems. The ability to do the same on ACPI based systems is added by this patch. On ACPI based systems the resulting strings look like \_SB.PCI0.CIO2.port@1.endpoint@0 where the nodes are separated by a dot (".") and the first three are ACPI device nodes and the latter two ACPI data nodes. Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Petr Mladek <pmladek@suse.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'lib/vsprintf.c')
-rw-r--r--lib/vsprintf.c36
1 files changed, 36 insertions, 0 deletions
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 4b766ee00dea..65dd5804a93b 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -1991,6 +1991,36 @@ char *device_node_string(char *buf, char *end, struct device_node *dn,
return widen_string(buf, buf - buf_start, end, spec);
}
+static noinline_for_stack
+char *fwnode_string(char *buf, char *end, struct fwnode_handle *fwnode,
+ struct printf_spec spec, const char *fmt)
+{
+ struct printf_spec str_spec = spec;
+ char *buf_start = buf;
+
+ str_spec.field_width = -1;
+
+ if (*fmt != 'w')
+ return error_string(buf, end, "(%pf?)", spec);
+
+ if (check_pointer(&buf, end, fwnode, spec))
+ return buf;
+
+ fmt++;
+
+ switch (*fmt) {
+ case 'P': /* name */
+ buf = string(buf, end, fwnode_get_name(fwnode), str_spec);
+ break;
+ case 'f': /* full_name */
+ default:
+ buf = fwnode_full_name_string(fwnode, buf, end);
+ break;
+ }
+
+ return widen_string(buf, buf - buf_start, end, spec);
+}
+
/*
* Show a '%p' thing. A kernel extension is that the '%p' is followed
* by an extra set of alphanumeric characters that are extended format
@@ -2095,6 +2125,10 @@ char *device_node_string(char *buf, char *end, struct device_node *dn,
* F device node flags
* c major compatible string
* C full compatible string
+ * - 'fw[fP]' For a firmware node (struct fwnode_handle) pointer
+ * Without an option prints the full name of the node
+ * f full name
+ * P node name, including a possible unit address
* - 'x' For printing the address. Equivalent to "%lx".
*
* ** When making changes please also update:
@@ -2170,6 +2204,8 @@ char *pointer(const char *fmt, char *buf, char *end, void *ptr,
return flags_string(buf, end, ptr, spec, fmt);
case 'O':
return device_node_string(buf, end, ptr, spec, fmt + 1);
+ case 'f':
+ return fwnode_string(buf, end, ptr, spec, fmt + 1);
case 'x':
return pointer_string(buf, end, ptr, spec);
}