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Subject[PATCH 2/3] platform/x86: wmi: add WMI support to MODULE_DEVICE_TABLE()
Date
Add WMI support to MODULE_DEVICE_TABLE() by adding info about struct
wmi_device_id in devicetable-offsets.c and add a WMI entry point in
file2alias.c.

The type argument for MODULE_DEVICE_TABLE(type, name) is wmi.

Signed-off-by: Mattias Jacobsson <2pi@mok.nu>
---

The idea of adding wmi support to MODULE_DEVICE_TABLE() originates from
a suggestion at [1]. However [2] states: "Please note that this tag
should not be added without the reporter's permission, especially if
the idea was not posted in a public forum." about the "Suggested-by:"
tag.
Pali Rohár: May I add a "Suggested-by:" tag?

[1]: https://lore.kernel.org/patchwork/patch/795892/#989423
[2]: Documentation/process/submitting-patches.rst

---
scripts/mod/devicetable-offsets.c | 3 +++
scripts/mod/file2alias.c | 18 ++++++++++++++++++
2 files changed, 21 insertions(+)

diff --git a/scripts/mod/devicetable-offsets.c b/scripts/mod/devicetable-offsets.c
index 293004499b4d..99276a422e77 100644
--- a/scripts/mod/devicetable-offsets.c
+++ b/scripts/mod/devicetable-offsets.c
@@ -225,5 +225,8 @@ int main(void)
DEVID_FIELD(typec_device_id, svid);
DEVID_FIELD(typec_device_id, mode);

+ DEVID(wmi_device_id);
+ DEVID_FIELD(wmi_device_id, guid_string);
+
return 0;
}
diff --git a/scripts/mod/file2alias.c b/scripts/mod/file2alias.c
index a37af7d71973..f014a2466ff7 100644
--- a/scripts/mod/file2alias.c
+++ b/scripts/mod/file2alias.c
@@ -1287,6 +1287,23 @@ static int do_typec_entry(const char *filename, void *symval, char *alias)
return 1;
}

+/* Looks like: wmi:guid */
+static int do_wmi_entry(const char *filename, void *symval, char *alias)
+{
+ DEF_FIELD_ADDR(symval, wmi_device_id, guid_string);
+ if (strlen(*guid_string) != WMI_GUID_STRING_LEN) {
+ warn("Invalid WMI device id 'wmi:%s' in '%s'\n",
+ *guid_string, filename);
+ return 0;
+ }
+ if (snprintf(alias, 500, WMI_MODULE_PREFIX "%s", *guid_string) < 0) {
+ warn("Could not generate all MODULE_ALIAS's in '%s'\n",
+ filename);
+ return 0;
+ }
+ return 1;
+}
+
/* Does namelen bytes of name exactly match the symbol? */
static bool sym_is(const char *name, unsigned namelen, const char *symbol)
{
@@ -1357,6 +1374,7 @@ static const struct devtable devtable[] = {
{"fslmc", SIZE_fsl_mc_device_id, do_fsl_mc_entry},
{"tbsvc", SIZE_tb_service_id, do_tbsvc_entry},
{"typec", SIZE_typec_device_id, do_typec_entry},
+ {"wmi", SIZE_wmi_device_id, do_wmi_entry},
};

/* Create MODULE_ALIAS() statements.
--
2.20.1
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