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Date: Thu, 10 Nov 2016 18:38:57 +0200
From: Tomas Winkler <tomas.winkler@...el.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Alexander Usyskin <alexander.usyskin@...el.com>,
linux-kernel@...r.kernel.org,
Tomas Winkler <tomas.winkler@...el.com>
Subject: [char-misc-next V4] mei: send OS type to the FW
From: Alexander Usyskin <alexander.usyskin@...el.com>
Tell the FW that we are running a sane OS and TPM2_ChangeEPS()
is supported. This workaround was added to support other broken OS
and we need to follow here. The command is sent just once at the boot time.
Signed-off-by: Tomas Winkler <tomas.winkler@...el.com>
Signed-off-by: Alexander Usyskin <alexander.usyskin@...el.com>
---
V2: 1. Use endain annotation
2. Drop bitfields
3. Drop trace dev_dbg out from the hook function
4. Add error code to failure info message
V3: mkhi header structure should be __packed
V4: Use dev_err instead of dev_info
drivers/misc/mei/bus-fixup.c | 95 ++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 95 insertions(+)
diff --git a/drivers/misc/mei/bus-fixup.c b/drivers/misc/mei/bus-fixup.c
index 9e10d86e3887..7f2cef9011ae 100644
--- a/drivers/misc/mei/bus-fixup.c
+++ b/drivers/misc/mei/bus-fixup.c
@@ -38,6 +38,9 @@ static const uuid_le mei_nfc_info_guid = MEI_UUID_NFC_INFO;
#define MEI_UUID_WD UUID_LE(0x05B79A6F, 0x4628, 0x4D7F, \
0x89, 0x9D, 0xA9, 0x15, 0x14, 0xCB, 0x32, 0xAB)
+#define MEI_UUID_MKHIF_FIX UUID_LE(0x55213584, 0x9a29, 0x4916, \
+ 0xba, 0xdf, 0xf, 0xb7, 0xed, 0x68, 0x2a, 0xeb)
+
#define MEI_UUID_ANY NULL_UUID_LE
/**
@@ -69,6 +72,97 @@ static void blacklist(struct mei_cl_device *cldev)
cldev->do_match = 0;
}
+#define OSTYPE_LINUX 2
+struct mei_os_ver {
+ __le16 build;
+ __le16 reserved1;
+ u8 os_type;
+ u8 major;
+ u8 minor;
+ u8 reserved2;
+} __packed;
+
+#define MKHI_FEATURE_PTT 0x10
+
+struct mkhi_rule_id {
+ __le16 rule_type;
+ u8 feature_id;
+ u8 reserved;
+} __packed;
+
+struct mkhi_fwcaps {
+ struct mkhi_rule_id id;
+ u8 len;
+ u8 data[0];
+} __packed;
+
+#define MKHI_FWCAPS_GROUP_ID 0x3
+#define MKHI_FWCAPS_SET_OS_VER_APP_RULE_CMD 6
+struct mkhi_msg_hdr {
+ u8 group_id;
+ u8 command;
+ u8 reserved;
+ u8 result;
+} __packed;
+
+struct mkhi_msg {
+ struct mkhi_msg_hdr hdr;
+ u8 data[0];
+} __packed;
+
+static int mei_osver(struct mei_cl_device *cldev)
+{
+ int ret;
+ const size_t size = sizeof(struct mkhi_msg_hdr) +
+ sizeof(struct mkhi_fwcaps) +
+ sizeof(struct mei_os_ver);
+ size_t length = 8;
+ char buf[size];
+ struct mkhi_msg *req;
+ struct mkhi_fwcaps *fwcaps;
+ struct mei_os_ver *os_ver;
+ unsigned int mode = MEI_CL_IO_TX_BLOCKING | MEI_CL_IO_TX_INTERNAL;
+
+ memset(buf, 0, size);
+
+ req = (struct mkhi_msg *)buf;
+ req->hdr.group_id = MKHI_FWCAPS_GROUP_ID;
+ req->hdr.command = MKHI_FWCAPS_SET_OS_VER_APP_RULE_CMD;
+
+ fwcaps = (struct mkhi_fwcaps *)req->data;
+
+ fwcaps->id.rule_type = 0x0;
+ fwcaps->id.feature_id = MKHI_FEATURE_PTT;
+ fwcaps->len = sizeof(*os_ver);
+ os_ver = (struct mei_os_ver *)fwcaps->data;
+ os_ver->os_type = OSTYPE_LINUX;
+
+ ret = __mei_cl_send(cldev->cl, buf, size, mode);
+ if (ret < 0)
+ return ret;
+
+ ret = __mei_cl_recv(cldev->cl, buf, length);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+static void mei_mkhi_fix(struct mei_cl_device *cldev)
+{
+ int ret;
+
+ ret = mei_cldev_enable(cldev);
+ if (ret)
+ return;
+
+ ret = mei_osver(cldev);
+ if (ret)
+ dev_err(&cldev->dev, "OS version command failed %d\n", ret);
+
+ mei_cldev_disable(cldev);
+}
+
/**
* mei_wd - wd client on the bus, change protocol version
* as the API has changed.
@@ -310,6 +404,7 @@ static struct mei_fixup {
MEI_FIXUP(MEI_UUID_NFC_INFO, blacklist),
MEI_FIXUP(MEI_UUID_NFC_HCI, mei_nfc),
MEI_FIXUP(MEI_UUID_WD, mei_wd),
+ MEI_FIXUP(MEI_UUID_MKHIF_FIX, mei_mkhi_fix),
};
/**
--
2.7.4
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