platform/chrome: Support reading/writing the vboot context

Some EC implementations include a small nvram space used to store
verified boot context data. This patch offers a way to expose this
data to userspace.

Reviewed-by: Javier Martinez Canillas <javier@osg.samsung.com>
Signed-off-by: Emilio López <emilio.lopez@collabora.co.uk>
Signed-off-by: Olof Johansson <olof@lixom.net>

3 files changed, 140 insertions, 1 deletions

diff --git a/drivers/platform/chrome/Makefile b/drivers/platform/chrome/Makefile
index 4a11b010f5d8..bc498bda8211 100644
--- a/drivers/platform/chrome/Makefile
+++ b/drivers/platform/chrome/Makefile
@@ -1,7 +1,8 @@
 
 obj-$(CONFIG_CHROMEOS_LAPTOP)   += chromeos_laptop.o
 obj-$(CONFIG_CHROMEOS_PSTORE)   += chromeos_pstore.o
-cros_ec_devs-objs               := cros_ec_dev.o cros_ec_sysfs.o cros_ec_lightbar.o
+cros_ec_devs-objs               := cros_ec_dev.o cros_ec_sysfs.o \
+                                   cros_ec_lightbar.o cros_ec_vbc.o
 obj-$(CONFIG_CROS_EC_CHARDEV)   += cros_ec_devs.o
 obj-$(CONFIG_CROS_EC_LPC)       += cros_ec_lpc.o
 obj-$(CONFIG_CROS_EC_PROTO)     += cros_ec_proto.o
diff --git a/drivers/platform/chrome/cros_ec_dev.c b/drivers/platform/chrome/cros_ec_dev.c
index 2f4099820480..d45cd254ed1c 100644
--- a/drivers/platform/chrome/cros_ec_dev.c
+++ b/drivers/platform/chrome/cros_ec_dev.c
@@ -32,6 +32,7 @@ static int ec_major;
 static const struct attribute_group *cros_ec_groups[] = {
         &cros_ec_attr_group,
         &cros_ec_lightbar_attr_group,
+        &cros_ec_vbc_attr_group,
         NULL,
 };
 
diff --git a/drivers/platform/chrome/cros_ec_vbc.c b/drivers/platform/chrome/cros_ec_vbc.c
new file mode 100644
index 000000000000..564a0d08c8bf
--- /dev/null
+++ b/drivers/platform/chrome/cros_ec_vbc.c
@@ -0,0 +1,137 @@
+/*
+ * cros_ec_vbc - Expose the vboot context nvram to userspace
+ *
+ * Copyright (C) 2015 Collabora Ltd.
+ *
+ * based on vendor driver,
+ *
+ * Copyright (C) 2012 The Chromium OS Authors
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that 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.
+ */
+
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/mfd/cros_ec.h>
+#include <linux/mfd/cros_ec_commands.h>
+#include <linux/slab.h>
+
+static ssize_t vboot_context_read(struct file *filp, struct kobject *kobj,
+                                  struct bin_attribute *att, char *buf,
+                                  loff_t pos, size_t count)
+{
+        struct device *dev = container_of(kobj, struct device, kobj);
+        struct cros_ec_dev *ec = container_of(dev, struct cros_ec_dev,
+                                              class_dev);
+        struct cros_ec_device *ecdev = ec->ec_dev;
+        struct ec_params_vbnvcontext *params;
+        struct cros_ec_command *msg;
+        int err;
+        const size_t para_sz = sizeof(params->op);
+        const size_t resp_sz = sizeof(struct ec_response_vbnvcontext);
+        const size_t payload = max(para_sz, resp_sz);
+
+        msg = kmalloc(sizeof(*msg) + payload, GFP_KERNEL);
+        if (!msg)
+                return -ENOMEM;
+
+        /* NB: we only kmalloc()ated enough space for the op field */
+        params = (struct ec_params_vbnvcontext *)msg->data;
+        params->op = EC_VBNV_CONTEXT_OP_READ;
+
+        msg->version = EC_VER_VBNV_CONTEXT;
+        msg->command = EC_CMD_VBNV_CONTEXT;
+        msg->outsize = para_sz;
+        msg->insize = resp_sz;
+
+        err = cros_ec_cmd_xfer(ecdev, msg);
+        if (err < 0) {
+                dev_err(dev, "Error sending read request: %d\n", err);
+                kfree(msg);
+                return err;
+        }
+
+        memcpy(buf, msg->data, resp_sz);
+
+        kfree(msg);
+        return resp_sz;
+}
+
+static ssize_t vboot_context_write(struct file *filp, struct kobject *kobj,
+                                   struct bin_attribute *attr, char *buf,
+                                   loff_t pos, size_t count)
+{
+        struct device *dev = container_of(kobj, struct device, kobj);
+        struct cros_ec_dev *ec = container_of(dev, struct cros_ec_dev,
+                                              class_dev);
+        struct cros_ec_device *ecdev = ec->ec_dev;
+        struct ec_params_vbnvcontext *params;
+        struct cros_ec_command *msg;
+        int err;
+        const size_t para_sz = sizeof(*params);
+        const size_t data_sz = sizeof(params->block);
+
+        /* Only write full values */
+        if (count != data_sz)
+                return -EINVAL;
+
+        msg = kmalloc(sizeof(*msg) + para_sz, GFP_KERNEL);
+        if (!msg)
+                return -ENOMEM;
+
+        params = (struct ec_params_vbnvcontext *)msg->data;
+        params->op = EC_VBNV_CONTEXT_OP_WRITE;
+        memcpy(params->block, buf, data_sz);
+
+        msg->version = EC_VER_VBNV_CONTEXT;
+        msg->command = EC_CMD_VBNV_CONTEXT;
+        msg->outsize = para_sz;
+        msg->insize = 0;
+
+        err = cros_ec_cmd_xfer(ecdev, msg);
+        if (err < 0) {
+                dev_err(dev, "Error sending write request: %d\n", err);
+                kfree(msg);
+                return err;
+        }
+
+        kfree(msg);
+        return data_sz;
+}
+
+static umode_t cros_ec_vbc_is_visible(struct kobject *kobj,
+                                      struct bin_attribute *a, int n)
+{
+        struct device *dev = container_of(kobj, struct device, kobj);
+        struct cros_ec_dev *ec = container_of(dev, struct cros_ec_dev,
+                                              class_dev);
+        struct device_node *np = ec->ec_dev->dev->of_node;
+
+        if (IS_ENABLED(CONFIG_OF) && np) {
+                if (of_property_read_bool(np, "google,has-vbc-nvram"))
+                        return a->attr.mode;
+        }
+
+        return 0;
+}
+
+static BIN_ATTR_RW(vboot_context, 16);
+
+static struct bin_attribute *cros_ec_vbc_bin_attrs[] = {
+        &bin_attr_vboot_context,
+        NULL
+};
+
+struct attribute_group cros_ec_vbc_attr_group = {
+        .name = "vbc",
+        .bin_attrs = cros_ec_vbc_bin_attrs,
+        .is_bin_visible = cros_ec_vbc_is_visible,
+};