drivers/platform/chromeos_ec-fw.c

   1 /*
   2  *  Copyright (C) 2012 Google, Inc
   3  *
   4  *  This program is free software; you can redistribute it and/or modify
   5  *  it under the terms of the GNU General Public License as published by
   6  *  the Free Software Foundation; either version 2 of the License, or
   7  *  (at your option) any later version.
   8  *
   9  *  This program is distributed in the hope that it will be useful,
  10  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *  GNU General Public License for more details.
  13  *
  14  *  You should have received a copy of the GNU General Public License
  15  *  along with this program; if not, write to the Free Software
  16  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  17  *
  18  *
  19  * Expose the ChromeOS EC firmware information.
  20  */
  21
  22 #include <linux/module.h>
  23 #include <linux/mfd/chromeos_ec.h>
  24 #include <linux/mfd/chromeos_ec_commands.h>
  25 #include <linux/platform_device.h>
  26
  27 static ssize_t ec_fw_version_show(struct device *dev,
  28                                   struct device_attribute *attr, char *buf)
  29 {
  30         struct chromeos_ec_device *ec = dev_get_drvdata(dev);
  31         struct ec_response_get_version info;
  32         const char * const copy_name[] = {"?", "RO", "RW"};
  33         int ret;
  34
  35         ret = ec->command_recv(ec, EC_CMD_GET_VERSION, &info,
  36                                sizeof(struct ec_response_get_version));
  37         if (ret < 0)
  38                 return ret;
  39
  40         if (info.current_image > EC_IMAGE_RW)
  41                 info.current_image = EC_IMAGE_UNKNOWN;
  42
  43         return scnprintf(buf, PAGE_SIZE, "Current: %s\nRO: %s\nRW: %s\n",
  44                          copy_name[info.current_image], info.version_string_ro,
  45                          info.version_string_rw);
  46 }
  47
  48 static ssize_t ec_build_info_show(struct device *dev,
  49                                   struct device_attribute *attr, char *buf)
  50 {
  51         struct chromeos_ec_device *ec = dev_get_drvdata(dev);
  52         char info[EC_HOST_PARAM_SIZE];
  53         int ret;
  54
  55         ret = ec->command_recv(ec, EC_CMD_GET_BUILD_INFO, info, sizeof(info));
  56         if (ret < 0)
  57                 return ret;
  58
  59         return scnprintf(buf, PAGE_SIZE, "%s\n", info);
  60 }
  61
  62 static ssize_t ec_chip_info_show(struct device *dev,
  63                                  struct device_attribute *attr, char *buf)
  64 {
  65         struct chromeos_ec_device *ec = dev_get_drvdata(dev);
  66         struct ec_response_get_chip_info info;
  67         int ret;
  68
  69         ret = ec->command_recv(ec, EC_CMD_GET_CHIP_INFO, &info,
  70                                sizeof(struct ec_response_get_chip_info));
  71         if (ret < 0)
  72                 return ret;
  73
  74         return scnprintf(buf, PAGE_SIZE, "%s %s %s\n",
  75                          info.vendor, info.name, info.revision);
  76 }
  77
  78 static ssize_t ec_dev_usb_store(struct device *dev,
  79                                 struct device_attribute *attr,
  80                                 const char *buf, size_t count)
  81 {
  82         int err;
  83         err = chromeos_set_dev_usb();
  84         if (err)
  85                 return err;
  86         return count;
  87 }
  88
  89 static DEVICE_ATTR(fw_version, S_IRUGO, ec_fw_version_show, NULL);
  90 static DEVICE_ATTR(build_info, S_IRUGO, ec_build_info_show, NULL);
  91 static DEVICE_ATTR(chip_info, S_IRUGO, ec_chip_info_show, NULL);
  92 static DEVICE_ATTR(dev_usb, S_IWUGO, NULL, ec_dev_usb_store);
  93
  94 static struct attribute *ec_fw_attrs[] = {
  95         &dev_attr_fw_version.attr,
  96         &dev_attr_build_info.attr,
  97         &dev_attr_chip_info.attr,
  98         NULL
  99 };
 100
 101 static const struct attribute_group ec_fw_attr_group = {
 102         .attrs = ec_fw_attrs,
 103 };
 104
 105 static int __devinit ec_fw_probe(struct platform_device *pdev)
 106 {
 107         struct chromeos_ec_device *ec = dev_get_drvdata(pdev->dev.parent);
 108         struct device *dev = ec->dev;
 109         int err;
 110
 111         err = sysfs_create_group(&dev->kobj, &ec_fw_attr_group);
 112         if (err) {
 113                 dev_warn(dev, "error creating sysfs entries.\n");
 114                 return err;
 115         }
 116
 117         dev_dbg(dev, "Chrome EC Firmware Information\n");
 118
 119         return 0;
 120 }
 121
 122 static int __devexit ec_fw_remove(struct platform_device *pdev)
 123 {
 124         struct chromeos_ec_device *ec = dev_get_drvdata(pdev->dev.parent);
 125
 126         sysfs_remove_group(&ec->dev->kobj, &ec_fw_attr_group);
 127
 128         return 0;
 129 }
 130
 131 static struct platform_driver ec_fw_driver = {
 132         .probe = ec_fw_probe,
 133         .remove = __devexit_p(ec_fw_remove),
 134         .driver = {
 135                 .name = "cros_ec-fw",
 136         },
 137 };
 138
 139 module_platform_driver(ec_fw_driver);
 140
 141 MODULE_LICENSE("GPL");
 142 MODULE_DESCRIPTION("ChromeOS EC firmware");
 143 MODULE_ALIAS("platform:cros_ec-fw");