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cros_ec_dev.c
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/* * 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/mfd/core.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/pm.h> #include <linux/slab.h> #include <linux/uaccess.h> #include "cros_ec_debugfs.h" #include "cros_ec_dev.h" /* Device variables */ #define CROS_MAX_DEV 128 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, }; static struct class cros_class = { .owner = THIS_MODULE, .name = "chromeos", .dev_groups = cros_ec_groups, }; /* Basic communication */ static int ec_get_version(struct cros_ec_dev *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; int ret; msg = kmalloc(sizeof(*msg) + sizeof(*resp), GFP_KERNEL); if (!msg) return -ENOMEM; msg->version = 0; msg->command = EC_CMD_GET_VERSION + ec->cmd_offset; msg->insize = sizeof(*resp); msg->outsize = 0; ret = cros_ec_cmd_xfer(ec->ec_dev, msg); if (ret < 0) goto exit; if (msg->result != EC_RES_SUCCESS) { snprintf(str, maxlen, "%s\nUnknown EC version: EC returned %d\n", CROS_EC_DEV_VERSION, msg->result); ret = -EINVAL; goto exit; } resp = (struct ec_response_get_version *)msg->data; 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]); ret = 0; exit: kfree(msg); return ret; } static int cros_ec_check_features(struct cros_ec_dev *ec, int feature) { struct cros_ec_command *msg; int ret; if (ec->features[0] == -1U && ec->features[1] == -1U) { /* features bitmap not read yet */ msg = kmalloc(sizeof(*msg) + sizeof(ec->features), GFP_KERNEL); if (!msg) return -ENOMEM; msg->version = 0; msg->command = EC_CMD_GET_FEATURES + ec->cmd_offset; msg->insize = sizeof(ec->features); msg->outsize = 0; ret = cros_ec_cmd_xfer(ec->ec_dev, msg); if (ret < 0 || msg->result != EC_RES_SUCCESS) { dev_warn(ec->dev, "cannot get EC features: %d/%d\n", ret, msg->result); memset(ec->features, 0, sizeof(ec->features)); } memcpy(ec->features, msg->data, sizeof(ec->features)); dev_dbg(ec->dev, "EC features %08x %08x\n", ec->features[0], ec->features[1]); kfree(msg); } return ec->features[feature / 32] & EC_FEATURE_MASK_0(feature); } /* Device file ops */ static int ec_device_open(struct inode *inode, struct file *filp) { struct cros_ec_dev *ec = container_of(inode->i_cdev, struct cros_ec_dev, cdev); filp->private_data = ec; nonseekable_open(inode, filp); 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_dev *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_dev *ec, void __user *arg) { long ret; struct cros_ec_command u_cmd; struct cros_ec_command *s_cmd; if (copy_from_user(&u_cmd, arg, sizeof(u_cmd))) return -EFAULT; if ((u_cmd.outsize > EC_MAX_MSG_BYTES) || (u_cmd.insize > EC_MAX_MSG_BYTES)) return -EINVAL; s_cmd = kmalloc(sizeof(*s_cmd) + max(u_cmd.outsize, u_cmd.insize), GFP_KERNEL); if (!s_cmd) return -ENOMEM; if (copy_from_user(s_cmd, arg, sizeof(*s_cmd) + u_cmd.outsize)) { ret = -EFAULT; goto exit; } if (u_cmd.outsize != s_cmd->outsize || u_cmd.insize != s_cmd->insize) { ret = -EINVAL; goto exit; } s_cmd->command += ec->cmd_offset; ret = cros_ec_cmd_xfer(ec->ec_dev, s_cmd); /* Only copy data to userland if data was received. */ if (ret < 0) goto exit; if (copy_to_user(arg, s_cmd, sizeof(*s_cmd) + s_cmd->insize)) ret = -EFAULT; exit: kfree(s_cmd); return ret; } static long ec_device_ioctl_readmem(struct cros_ec_dev *ec, void __user *arg) { struct cros_ec_device *ec_dev = ec->ec_dev; struct cros_ec_readmem s_mem = { }; long num; /* Not every platform supports direct reads */ if (!ec_dev->cmd_readmem) return -ENOTTY; if (copy_from_user(&s_mem, arg, sizeof(s_mem))) return -EFAULT; num = ec_dev->cmd_readmem(ec_dev, 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_dev *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, #ifdef CONFIG_COMPAT .compat_ioctl = ec_device_ioctl, #endif }; static void __remove(struct device *dev) { struct cros_ec_dev *ec = container_of(dev, struct cros_ec_dev, class_dev); kfree(ec); } static void cros_ec_sensors_register(struct cros_ec_dev *ec) { /* * Issue a command to get the number of sensor reported. * Build an array of sensors driver and register them all. */ int ret, i, id, sensor_num; struct mfd_cell *sensor_cells; struct cros_ec_sensor_platform *sensor_platforms; int sensor_type[MOTIONSENSE_TYPE_MAX]; struct ec_params_motion_sense *params; struct ec_response_motion_sense *resp; struct cros_ec_command *msg; msg = kzalloc(sizeof(struct cros_ec_command) + max(sizeof(*params), sizeof(*resp)), GFP_KERNEL); if (msg == NULL) return; msg->version = 2; msg->command = EC_CMD_MOTION_SENSE_CMD + ec->cmd_offset; msg->outsize = sizeof(*params); msg->insize = sizeof(*resp); params = (struct ec_params_motion_sense *)msg->data; params->cmd = MOTIONSENSE_CMD_DUMP; ret = cros_ec_cmd_xfer(ec->ec_dev, msg); if (ret < 0 || msg->result != EC_RES_SUCCESS) { dev_warn(ec->dev, "cannot get EC sensor information: %d/%d\n", ret, msg->result); goto error; } resp = (struct ec_response_motion_sense *)msg->data; sensor_num = resp->dump.sensor_count; /* Allocate 2 extra sensors in case lid angle or FIFO are needed */ sensor_cells = kzalloc(sizeof(struct mfd_cell) * (sensor_num + 2), GFP_KERNEL); if (sensor_cells == NULL) goto error; sensor_platforms = kzalloc(sizeof(struct cros_ec_sensor_platform) * (sensor_num + 1), GFP_KERNEL); if (sensor_platforms == NULL) goto error_platforms; memset(sensor_type, 0, sizeof(sensor_type)); id = 0; for (i = 0; i < sensor_num; i++) { params->cmd = MOTIONSENSE_CMD_INFO; params->info.sensor_num = i; ret = cros_ec_cmd_xfer(ec->ec_dev, msg); if (ret < 0 || msg->result != EC_RES_SUCCESS) { dev_warn(ec->dev, "no info for EC sensor %d : %d/%d\n", i, ret, msg->result); continue; } switch (resp->info.type) { case MOTIONSENSE_TYPE_ACCEL: sensor_cells[id].name = "cros-ec-accel"; break; case MOTIONSENSE_TYPE_BARO: sensor_cells[id].name = "cros-ec-baro"; break; case MOTIONSENSE_TYPE_GYRO: sensor_cells[id].name = "cros-ec-gyro"; break; case MOTIONSENSE_TYPE_MAG: sensor_cells[id].name = "cros-ec-mag"; break; case MOTIONSENSE_TYPE_PROX: sensor_cells[id].name = "cros-ec-prox"; break; case MOTIONSENSE_TYPE_LIGHT: sensor_cells[id].name = "cros-ec-light"; break; case MOTIONSENSE_TYPE_ACTIVITY: sensor_cells[id].name = "cros-ec-activity"; break; default: dev_warn(ec->dev, "unknown type %d\n", resp->info.type); continue; } sensor_platforms[id].sensor_num = i; sensor_cells[id].id = sensor_type[resp->info.type]; sensor_cells[id].platform_data = &sensor_platforms[id]; sensor_cells[id].pdata_size = sizeof(struct cros_ec_sensor_platform); sensor_type[resp->info.type]++; id++; } if (sensor_type[MOTIONSENSE_TYPE_ACCEL] >= 2) { sensor_platforms[id].sensor_num = sensor_num; sensor_cells[id].name = "cros-ec-angle"; sensor_cells[id].id = 0; sensor_cells[id].platform_data = &sensor_platforms[id]; sensor_cells[id].pdata_size = sizeof(struct cros_ec_sensor_platform); id++; } if (cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE_FIFO)) { sensor_cells[id].name = "cros-ec-ring"; id++; } ret = mfd_add_devices(ec->dev, 0, sensor_cells, id, NULL, 0, NULL); if (ret) dev_err(ec->dev, "failed to add EC sensors\n"); kfree(sensor_platforms); error_platforms: kfree(sensor_cells); error: kfree(msg); } static int ec_device_probe(struct platform_device *pdev) { int retval = -ENOMEM; struct device *dev = &pdev->dev; struct cros_ec_platform *ec_platform = dev_get_platdata(dev); struct cros_ec_dev *ec = kzalloc(sizeof(*ec), GFP_KERNEL); if (!ec) return retval; dev_set_drvdata(dev, ec); ec->ec_dev = dev_get_drvdata(dev->parent); ec->dev = dev; ec->cmd_offset = ec_platform->cmd_offset; ec->features[0] = -1U; /* Not cached yet */ ec->features[1] = -1U; /* Not cached yet */ device_initialize(&ec->class_dev); cdev_init(&ec->cdev, &fops); /* * Add the class device * Link to the character device for creating the /dev entry * in devtmpfs. */ ec->class_dev.devt = MKDEV(ec_major, pdev->id); ec->class_dev.class = &cros_class; ec->class_dev.parent = dev; ec->class_dev.release = __remove; retval = dev_set_name(&ec->class_dev, "%s", ec_platform->ec_name); if (retval) { dev_err(dev, "dev_set_name failed => %d\n", retval); goto failed; } retval = cdev_device_add(&ec->cdev, &ec->class_dev); if (retval) { dev_err(dev, "cdev_device_add failed => %d\n", retval); goto failed; } if (cros_ec_debugfs_init(ec)) dev_warn(dev, "failed to create debugfs directory\n"); /* check whether this EC is a sensor hub. */ if (cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE)) cros_ec_sensors_register(ec); /* Take control of the lightbar from the EC. */ lb_manual_suspend_ctrl(ec, 1); return 0; failed: put_device(&ec->class_dev); return retval; } static int ec_device_remove(struct platform_device *pdev) { struct cros_ec_dev *ec = dev_get_drvdata(&pdev->dev); /* Let the EC take over the lightbar again. */ lb_manual_suspend_ctrl(ec, 0); cros_ec_debugfs_remove(ec); cdev_del(&ec->cdev); device_unregister(&ec->class_dev); return 0; } static const struct platform_device_id cros_ec_id[] = { { "cros-ec-ctl", 0 }, { /* sentinel */ }, }; MODULE_DEVICE_TABLE(platform, cros_ec_id); static __maybe_unused int ec_device_suspend(struct device *dev) { struct cros_ec_dev *ec = dev_get_drvdata(dev); lb_suspend(ec); return 0; } static __maybe_unused int ec_device_resume(struct device *dev) { struct cros_ec_dev *ec = dev_get_drvdata(dev); lb_resume(ec); return 0; } static const struct dev_pm_ops cros_ec_dev_pm_ops = { #ifdef CONFIG_PM_SLEEP .suspend = ec_device_suspend, .resume = ec_device_resume, #endif }; static struct platform_driver cros_ec_dev_driver = { .driver = { .name = "cros-ec-ctl", .pm = &cros_ec_dev_pm_ops, }, .probe = ec_device_probe, .remove = ec_device_remove, }; static int __init cros_ec_dev_init(void) { int ret; dev_t dev = 0; ret = class_register(&cros_class); if (ret) { pr_err(CROS_EC_DEV_NAME ": failed to register device class\n"); return ret; } /* 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_unregister(&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_unregister(&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");
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