1 files changed, 274 insertions, 0 deletions

diff --git a/drivers/platform/chrome/cros_ec_dev.c b/drivers/platform/chrome/cros_ec_dev.c
new file mode 100644
index 000000000000..6090d0b2826f
--- /dev/null
+++ b/drivers/platform/chrome/cros_ec_dev.c
@@ -0,0 +1,274 @@
+/*
+ * cros_ec_dev - expose the Chrome OS Embedded Controller to user-space
+ *
+ * Copyright (C) 2014 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/fs.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/uaccess.h>
+
+#include "cros_ec_dev.h"
+
+/* Device variables */
+#define CROS_MAX_DEV 128
+static struct class *cros_class;
+static int ec_major;
+
+/* Basic communication */
+static int ec_get_version(struct cros_ec_device *ec, char *str, int maxlen)
+{
+        struct ec_response_get_version *resp;
+        static const char * const current_image_name[] = {
+                "unknown", "read-only", "read-write", "invalid",
+        };
+        struct cros_ec_command msg = {
+                .version = 0,
+                .command = EC_CMD_GET_VERSION,
+                .outdata = { 0 },
+                .outsize = 0,
+                .indata = { 0 },
+                .insize = sizeof(*resp),
+        };
+        int ret;
+
+        ret = cros_ec_cmd_xfer(ec, &msg);
+        if (ret < 0)
+                return ret;
+
+        if (msg.result != EC_RES_SUCCESS) {
+                snprintf(str, maxlen,
+                         "%s\nUnknown EC version: EC returned %d\n",
+                         CROS_EC_DEV_VERSION, msg.result);
+                return 0;
+        }
+
+        resp = (struct ec_response_get_version *)msg.indata;
+        if (resp->current_image >= ARRAY_SIZE(current_image_name))
+                resp->current_image = 3; /* invalid */
+
+        snprintf(str, maxlen, "%s\n%s\n%s\n%s\n", CROS_EC_DEV_VERSION,
+                 resp->version_string_ro, resp->version_string_rw,
+                 current_image_name[resp->current_image]);
+
+        return 0;
+}
+
+/* Device file ops */
+static int ec_device_open(struct inode *inode, struct file *filp)
+{
+        filp->private_data = container_of(inode->i_cdev,
+                                          struct cros_ec_device, cdev);
+        return 0;
+}
+
+static int ec_device_release(struct inode *inode, struct file *filp)
+{
+        return 0;
+}
+
+static ssize_t ec_device_read(struct file *filp, char __user *buffer,
+                              size_t length, loff_t *offset)
+{
+        struct cros_ec_device *ec = filp->private_data;
+        char msg[sizeof(struct ec_response_get_version) +
+                 sizeof(CROS_EC_DEV_VERSION)];
+        size_t count;
+        int ret;
+
+        if (*offset != 0)
+                return 0;
+
+        ret = ec_get_version(ec, msg, sizeof(msg));
+        if (ret)
+                return ret;
+
+        count = min(length, strlen(msg));
+
+        if (copy_to_user(buffer, msg, count))
+                return -EFAULT;
+
+        *offset = count;
+        return count;
+}
+
+/* Ioctls */
+static long ec_device_ioctl_xcmd(struct cros_ec_device *ec, void __user *arg)
+{
+        long ret;
+        struct cros_ec_command s_cmd = { };
+
+        if (copy_from_user(&s_cmd, arg, sizeof(s_cmd)))
+                return -EFAULT;
+
+        ret = cros_ec_cmd_xfer(ec, &s_cmd);
+        /* Only copy data to userland if data was received. */
+        if (ret < 0)
+                return ret;
+
+        if (copy_to_user(arg, &s_cmd, sizeof(s_cmd)))
+                return -EFAULT;
+
+        return 0;
+}
+
+static long ec_device_ioctl_readmem(struct cros_ec_device *ec, void __user *arg)
+{
+        struct cros_ec_readmem s_mem = { };
+        long num;
+
+        /* Not every platform supports direct reads */
+        if (!ec->cmd_readmem)
+                return -ENOTTY;
+
+        if (copy_from_user(&s_mem, arg, sizeof(s_mem)))
+                return -EFAULT;
+
+        num = ec->cmd_readmem(ec, s_mem.offset, s_mem.bytes, s_mem.buffer);
+        if (num <= 0)
+                return num;
+
+        if (copy_to_user((void __user *)arg, &s_mem, sizeof(s_mem)))
+                return -EFAULT;
+
+        return 0;
+}
+
+static long ec_device_ioctl(struct file *filp, unsigned int cmd,
+                            unsigned long arg)
+{
+        struct cros_ec_device *ec = filp->private_data;
+
+        if (_IOC_TYPE(cmd) != CROS_EC_DEV_IOC)
+                return -ENOTTY;
+
+        switch (cmd) {
+        case CROS_EC_DEV_IOCXCMD:
+                return ec_device_ioctl_xcmd(ec, (void __user *)arg);
+        case CROS_EC_DEV_IOCRDMEM:
+                return ec_device_ioctl_readmem(ec, (void __user *)arg);
+        }
+
+        return -ENOTTY;
+}
+
+/* Module initialization */
+static const struct file_operations fops = {
+        .open = ec_device_open,
+        .release = ec_device_release,
+        .read = ec_device_read,
+        .unlocked_ioctl = ec_device_ioctl,
+};
+
+static int ec_device_probe(struct platform_device *pdev)
+{
+        struct cros_ec_device *ec = dev_get_drvdata(pdev->dev.parent);
+        int retval = -ENOTTY;
+        dev_t devno = MKDEV(ec_major, 0);
+
+        /* Instantiate it (and remember the EC) */
+        cdev_init(&ec->cdev, &fops);
+
+        retval = cdev_add(&ec->cdev, devno, 1);
+        if (retval) {
+                dev_err(&pdev->dev, ": failed to add character device\n");
+                return retval;
+        }
+
+        ec->vdev = device_create(cros_class, NULL, devno, ec,
+                                 CROS_EC_DEV_NAME);
+        if (IS_ERR(ec->vdev)) {
+                retval = PTR_ERR(ec->vdev);
+                dev_err(&pdev->dev, ": failed to create device\n");
+                cdev_del(&ec->cdev);
+                return retval;
+        }
+
+        /* Initialize extra interfaces */
+        ec_dev_sysfs_init(ec);
+        ec_dev_lightbar_init(ec);
+
+        return 0;
+}
+
+static int ec_device_remove(struct platform_device *pdev)
+{
+        struct cros_ec_device *ec = dev_get_drvdata(pdev->dev.parent);
+
+        ec_dev_lightbar_remove(ec);
+        ec_dev_sysfs_remove(ec);
+        device_destroy(cros_class, MKDEV(ec_major, 0));
+        cdev_del(&ec->cdev);
+        return 0;
+}
+
+static struct platform_driver cros_ec_dev_driver = {
+        .driver = {
+                .name = "cros-ec-ctl",
+        },
+        .probe = ec_device_probe,
+        .remove = ec_device_remove,
+};
+
+static int __init cros_ec_dev_init(void)
+{
+        int ret;
+        dev_t dev = 0;
+
+        cros_class = class_create(THIS_MODULE, "chromeos");
+        if (IS_ERR(cros_class)) {
+                pr_err(CROS_EC_DEV_NAME ": failed to register device class\n");
+                return PTR_ERR(cros_class);
+        }
+
+        /* Get a range of minor numbers (starting with 0) to work with */
+        ret = alloc_chrdev_region(&dev, 0, CROS_MAX_DEV, CROS_EC_DEV_NAME);
+        if (ret < 0) {
+                pr_err(CROS_EC_DEV_NAME ": alloc_chrdev_region() failed\n");
+                goto failed_chrdevreg;
+        }
+        ec_major = MAJOR(dev);
+
+        /* Register the driver */
+        ret = platform_driver_register(&cros_ec_dev_driver);
+        if (ret < 0) {
+                pr_warn(CROS_EC_DEV_NAME ": can't register driver: %d\n", ret);
+                goto failed_devreg;
+        }
+        return 0;
+
+failed_devreg:
+        unregister_chrdev_region(MKDEV(ec_major, 0), CROS_MAX_DEV);
+failed_chrdevreg:
+        class_destroy(cros_class);
+        return ret;
+}
+
+static void __exit cros_ec_dev_exit(void)
+{
+        platform_driver_unregister(&cros_ec_dev_driver);
+        unregister_chrdev(ec_major, CROS_EC_DEV_NAME);
+        class_destroy(cros_class);
+}
+
+module_init(cros_ec_dev_init);
+module_exit(cros_ec_dev_exit);
+
+MODULE_AUTHOR("Bill Richardson <wfrichar@chromium.org>");
+MODULE_DESCRIPTION("Userspace interface to the Chrome OS Embedded Controller");
+MODULE_VERSION("1.0");
+MODULE_LICENSE("GPL");