CHROMIUM: platform: chromeos_ec: export firmware information

Add sysfs nodes to get firmware version and other EC info.

Signed-off-by: Vincent Palatin <vpalatin@chromium.org>
BUG=chrome-os-partner:8865
TEST=on Daisy, read the new sysfs nodes

Change-Id: I12528fb9c5dcb59578eaaf75481a5227083fe3d4
Reviewed-on: https://gerrit-int.chromium.org/18002
Reviewed-by: Olof Johansson <olofj@google.com>
Commit-Ready: Vincent Palatin <vpalatin@google.com>
Tested-by: Vincent Palatin <vpalatin@google.com>

diff --git a/drivers/platform/Makefile b/drivers/platform/Makefile
index 782953a..50e184c 100644 (file)
--- a/drivers/platform/Makefile
+++ b/drivers/platform/Makefile
@@ -3,3 +3,4 @@
 #
 
 obj-$(CONFIG_X86)              += x86/
+obj-$(CONFIG_MFD_CHROMEOS_EC)  += chromeos_ec-fw.o

diff --git a/drivers/platform/chromeos_ec-fw.c b/drivers/platform/chromeos_ec-fw.c
new file mode 100644 (file)
index 0000000..56054fc
--- /dev/null
+++ b/drivers/platform/chromeos_ec-fw.c
@@ -0,0 +1,127 @@
+/*
+ *  Copyright (C) 2012 Google, Inc
+ *
+ *  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.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ *
+ * Expose the ChromeOS EC firmware information.
+ */
+
+#include <linux/module.h>
+#include <linux/mfd/chromeos_ec.h>
+#include <linux/mfd/chromeos_ec_commands.h>
+#include <linux/platform_device.h>
+
+static ssize_t ec_fw_version_show(struct device *dev,
+                                 struct device_attribute *attr, char *buf)
+{
+       struct chromeos_ec_device *ec = dev_get_drvdata(dev);
+       struct ec_response_get_version info;
+       const char * const copy_name[] = {"?", "RO", "A", "B"};
+       int ret;
+
+       ret = ec->command_recv(ec, EC_CMD_GET_VERSION, &info,
+                              sizeof(struct ec_response_get_version));
+       if (ret < 0)
+               return ret;
+
+       if (info.current_image > EC_IMAGE_RW_B)
+               info.current_image = EC_IMAGE_UNKNOWN;
+
+       return scnprintf(buf, PAGE_SIZE, "Current: %s\nRO: %s\nA: %s\nB: %s\n",
+                        copy_name[info.current_image], info.version_string_ro,
+                        info.version_string_rw_a, info.version_string_rw_b);
+}
+
+static ssize_t ec_build_info_show(struct device *dev,
+                                 struct device_attribute *attr, char *buf)
+{
+       struct chromeos_ec_device *ec = dev_get_drvdata(dev);
+       struct ec_response_get_build_info info;
+       int ret;
+
+       ret = ec->command_recv(ec, EC_CMD_GET_BUILD_INFO, &info,
+                              sizeof(struct ec_response_get_build_info));
+       if (ret < 0)
+               return ret;
+
+       return scnprintf(buf, PAGE_SIZE, "%s\n", info.build_string);
+}
+
+static ssize_t ec_chip_info_show(struct device *dev,
+                                struct device_attribute *attr, char *buf)
+{
+       struct chromeos_ec_device *ec = dev_get_drvdata(dev);
+       struct ec_response_get_chip_info info;
+       int ret;
+
+       ret = ec->command_recv(ec, EC_CMD_GET_CHIP_INFO, &info,
+                              sizeof(struct ec_response_get_chip_info));
+       if (ret < 0)
+               return ret;
+
+       return scnprintf(buf, PAGE_SIZE, "%s %s %s\n",
+                        info.vendor, info.name, info.revision);
+}
+
+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 struct attribute *ec_fw_attrs[] = {
+       &dev_attr_fw_version.attr,
+       &dev_attr_build_info.attr,
+       &dev_attr_chip_info.attr,
+       NULL
+};
+
+static const struct attribute_group ec_fw_attr_group = {
+       .attrs = ec_fw_attrs,
+};
+
+static int __devinit ec_fw_probe(struct platform_device *pdev)
+{
+       struct chromeos_ec_device *ec = dev_get_drvdata(pdev->dev.parent);
+       struct device *dev = ec->dev;
+       int err;
+
+       err = sysfs_create_group(&dev->kobj, &ec_fw_attr_group);
+       if (err)
+               dev_warn(dev, "error creating sysfs entries.\n");
+       return err;
+}
+
+static int __devexit ec_fw_remove(struct platform_device *pdev)
+{
+       struct chromeos_ec_device *ec = dev_get_drvdata(pdev->dev.parent);
+
+       sysfs_remove_group(&ec->dev->kobj, &ec_fw_attr_group);
+
+       return 0;
+}
+
+static struct platform_driver ec_fw_driver = {
+       .probe = ec_fw_probe,
+       .remove = __devexit_p(ec_fw_remove),
+       .driver = {
+               .name = "cros_ec-fw",
+       },
+};
+
+module_platform_driver(ec_fw_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("ChromeOS EC firmware");
+MODULE_ALIAS("platform:cros_ec-fw");