From: Thadeu Lima de Souza Cascardo <cascardo@cascardo.eti.br>
Date: Thu, 15 Sep 2016 10:14:51 +0000 (+0000)
Subject: read/write chromeos vbc with sysfs
X-Git-Url: http://git.cascardo.eti.br/?p=cascardo%2Flinux.git;a=commitdiff_plain;h=5ebb098d669b9a1d3b55cd73f39a45a94352c413

read/write chromeos vbc with sysfs
---

diff --git a/drivers/platform/chromeos.c b/drivers/platform/chromeos.c
index 199ad9714e05..e317da01fe03 100644
--- a/drivers/platform/chromeos.c
+++ b/drivers/platform/chromeos.c
@@ -28,7 +28,6 @@
 
 static struct chromeos_vbc *chromeos_vbc_ptr;
 
-static int vbc_read(u8 *buf, int buf_size);
 static int vbc_write_byte(unsigned offset, u8 value);
 
 /* the following defines are copied from
@@ -72,6 +71,11 @@ static u8 crc8(const u8 *data, int len)
 	return (u8)(crc >> 8);
 }
 
+int chromeos_vbc_write(const u8 *buf, ssize_t size)
+{
+	return chromeos_vbc_ptr->write(buf, size);
+}
+
 static int vbc_write_byte(unsigned offset, u8 value)
 {
 	u8 buf[MAX_VBOOT_CONTEXT_BUFFER_SIZE];
@@ -80,7 +84,7 @@ static int vbc_write_byte(unsigned offset, u8 value)
 	if (!chromeos_vbc_ptr)
 		return -ENOSYS;
 
-	size = vbc_read(buf, sizeof(buf));
+	size = chromeos_vbc_read(buf, sizeof(buf));
 	if (size <= 0)
 		return -EINVAL;
 
@@ -101,7 +105,7 @@ static int vbc_write_byte(unsigned offset, u8 value)
  * of bytes in the vboot context buffer, -1 on any error (uninitialized
  * subsystem, corrupted crc8 value, not enough room in the buffer, etc.).
  */
-static int vbc_read(u8 *buf, int buf_size)
+int chromeos_vbc_read(u8 *buf, int buf_size)
 {
 	ssize_t size;
 
diff --git a/drivers/platform/chromeos_ec-fw.c b/drivers/platform/chromeos_ec-fw.c
index 7b34c984c34c..d2c0da23854f 100644
--- a/drivers/platform/chromeos_ec-fw.c
+++ b/drivers/platform/chromeos_ec-fw.c
@@ -80,23 +80,39 @@ static ssize_t ec_dev_usb_store(struct device *dev,
                                 struct device_attribute *attr,
                                 const char *buf, size_t count)
 {
-        int err;
-        err = chromeos_set_dev_usb();
-        if (err)
-                return err;
-        return count;
+	int err;
+	err = chromeos_set_dev_usb();
+	if (err)
+		return err;
+	return count;
+}
+
+static ssize_t ec_vbnv_store(struct device *dev,
+			     struct device_attribute *attr,
+			     const char *buf, size_t count)
+{
+	return chromeos_vbc_write(buf, count);
+}
+
+static ssize_t ec_vbnv_show(struct device *dev,
+			    struct device_attribute *attr,
+			    char *buf)
+{
+	return chromeos_vbc_read(buf, 16);
 }
 
 static DEVICE_ATTR(fw_version, S_IRUGO, ec_fw_version_show, NULL);
 static DEVICE_ATTR(build_info, S_IRUGO, ec_build_info_show, NULL);
 static DEVICE_ATTR(chip_info, S_IRUGO, ec_chip_info_show, NULL);
 static DEVICE_ATTR(dev_usb, S_IWUGO, NULL, ec_dev_usb_store);
+static DEVICE_ATTR(vbnv, S_IRUGO | S_IWUGO, ec_vbnv_show, ec_vbnv_store);
 
 static struct attribute *ec_fw_attrs[] = {
 	&dev_attr_fw_version.attr,
 	&dev_attr_build_info.attr,
 	&dev_attr_chip_info.attr,
 	&dev_attr_dev_usb.attr,
+	&dev_attr_vbnv.attr,
 	NULL
 };
 
diff --git a/include/linux/chromeos_platform.h b/include/linux/chromeos_platform.h
index c02e5fd80be0..3474c6ae8d4c 100644
--- a/include/linux/chromeos_platform.h
+++ b/include/linux/chromeos_platform.h
@@ -16,6 +16,8 @@
  */
 extern int chromeos_set_need_recovery(void);
 extern int chromeos_set_dev_usb(void);
+int chromeos_vbc_read(u8 *buf, int buf_size);
+int chromeos_vbc_write(const u8 *buf, int buf_size);
 
 #else
 
@@ -28,6 +30,16 @@ static inline int chromeos_set_dev_usb(void)
 {
 	return -ENODEV;
 }
+static inline int chromeos_vbc_read(u8 *buf, int buf_size)
+{
+	return -ENODEV;
+}
+
+static inline int chromeos_vbc_write(const u8 *buf, int buf_size)
+{
+	return -ENODEV;
+}
+
 #endif /* CONFIG_CHROMEOS */
 
 #endif /* _LINUX_CHROMEOS_PLATFORM_H */