forked from Minki/linux
c1778e5819
While ioctls normally return a negative error or 0 on success, this is not the case for CROS_EC_DEV_IOCXCMD in the cros_ec driver, which returns the number of bytes read instead. However, CROS_EC_DEV_IOCRDMEM in the same driver does not return the number of byte read on success. This is both inconsistent and problematic, since the amount of returned data can be dynamic. Have it return the number of data bytes for consistency. Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com> Reviewed-by: Benson Leung <bleung@chromium.org> Signed-off-by: Lee Jones <lee.jones@linaro.org>
586 lines
15 KiB
C
586 lines
15 KiB
C
/*
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* cros_ec_dev - expose the Chrome OS Embedded Controller to user-space
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*
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* Copyright (C) 2014 Google, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/fs.h>
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#include <linux/mfd/core.h>
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#include <linux/module.h>
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#include <linux/mod_devicetable.h>
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#include <linux/of_platform.h>
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#include <linux/platform_device.h>
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#include <linux/pm.h>
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#include <linux/slab.h>
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#include <linux/uaccess.h>
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#include "cros_ec_dev.h"
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#define DRV_NAME "cros-ec-dev"
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/* Device variables */
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#define CROS_MAX_DEV 128
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static int ec_major;
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static struct class cros_class = {
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.owner = THIS_MODULE,
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.name = "chromeos",
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};
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/* Basic communication */
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static int ec_get_version(struct cros_ec_dev *ec, char *str, int maxlen)
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{
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struct ec_response_get_version *resp;
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static const char * const current_image_name[] = {
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"unknown", "read-only", "read-write", "invalid",
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};
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struct cros_ec_command *msg;
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int ret;
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msg = kmalloc(sizeof(*msg) + sizeof(*resp), GFP_KERNEL);
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if (!msg)
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return -ENOMEM;
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msg->version = 0;
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msg->command = EC_CMD_GET_VERSION + ec->cmd_offset;
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msg->insize = sizeof(*resp);
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msg->outsize = 0;
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ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
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if (ret < 0)
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goto exit;
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if (msg->result != EC_RES_SUCCESS) {
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snprintf(str, maxlen,
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"%s\nUnknown EC version: EC returned %d\n",
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CROS_EC_DEV_VERSION, msg->result);
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ret = -EINVAL;
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goto exit;
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}
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resp = (struct ec_response_get_version *)msg->data;
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if (resp->current_image >= ARRAY_SIZE(current_image_name))
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resp->current_image = 3; /* invalid */
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snprintf(str, maxlen, "%s\n%s\n%s\n%s\n", CROS_EC_DEV_VERSION,
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resp->version_string_ro, resp->version_string_rw,
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current_image_name[resp->current_image]);
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ret = 0;
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exit:
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kfree(msg);
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return ret;
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}
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static int cros_ec_check_features(struct cros_ec_dev *ec, int feature)
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{
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struct cros_ec_command *msg;
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int ret;
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if (ec->features[0] == -1U && ec->features[1] == -1U) {
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/* features bitmap not read yet */
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msg = kmalloc(sizeof(*msg) + sizeof(ec->features), GFP_KERNEL);
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if (!msg)
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return -ENOMEM;
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msg->version = 0;
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msg->command = EC_CMD_GET_FEATURES + ec->cmd_offset;
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msg->insize = sizeof(ec->features);
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msg->outsize = 0;
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ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
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if (ret < 0 || msg->result != EC_RES_SUCCESS) {
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dev_warn(ec->dev, "cannot get EC features: %d/%d\n",
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ret, msg->result);
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memset(ec->features, 0, sizeof(ec->features));
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} else {
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memcpy(ec->features, msg->data, sizeof(ec->features));
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}
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dev_dbg(ec->dev, "EC features %08x %08x\n",
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ec->features[0], ec->features[1]);
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kfree(msg);
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}
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return ec->features[feature / 32] & EC_FEATURE_MASK_0(feature);
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}
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/* Device file ops */
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static int ec_device_open(struct inode *inode, struct file *filp)
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{
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struct cros_ec_dev *ec = container_of(inode->i_cdev,
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struct cros_ec_dev, cdev);
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filp->private_data = ec;
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nonseekable_open(inode, filp);
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return 0;
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}
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static int ec_device_release(struct inode *inode, struct file *filp)
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{
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return 0;
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}
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static ssize_t ec_device_read(struct file *filp, char __user *buffer,
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size_t length, loff_t *offset)
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{
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struct cros_ec_dev *ec = filp->private_data;
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char msg[sizeof(struct ec_response_get_version) +
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sizeof(CROS_EC_DEV_VERSION)];
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size_t count;
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int ret;
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if (*offset != 0)
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return 0;
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ret = ec_get_version(ec, msg, sizeof(msg));
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if (ret)
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return ret;
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count = min(length, strlen(msg));
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if (copy_to_user(buffer, msg, count))
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return -EFAULT;
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*offset = count;
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return count;
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}
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/* Ioctls */
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static long ec_device_ioctl_xcmd(struct cros_ec_dev *ec, void __user *arg)
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{
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long ret;
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struct cros_ec_command u_cmd;
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struct cros_ec_command *s_cmd;
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if (copy_from_user(&u_cmd, arg, sizeof(u_cmd)))
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return -EFAULT;
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if ((u_cmd.outsize > EC_MAX_MSG_BYTES) ||
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(u_cmd.insize > EC_MAX_MSG_BYTES))
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return -EINVAL;
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s_cmd = kmalloc(sizeof(*s_cmd) + max(u_cmd.outsize, u_cmd.insize),
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GFP_KERNEL);
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if (!s_cmd)
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return -ENOMEM;
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if (copy_from_user(s_cmd, arg, sizeof(*s_cmd) + u_cmd.outsize)) {
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ret = -EFAULT;
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goto exit;
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}
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if (u_cmd.outsize != s_cmd->outsize ||
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u_cmd.insize != s_cmd->insize) {
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ret = -EINVAL;
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goto exit;
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}
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s_cmd->command += ec->cmd_offset;
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ret = cros_ec_cmd_xfer(ec->ec_dev, s_cmd);
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/* Only copy data to userland if data was received. */
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if (ret < 0)
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goto exit;
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if (copy_to_user(arg, s_cmd, sizeof(*s_cmd) + s_cmd->insize))
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ret = -EFAULT;
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exit:
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kfree(s_cmd);
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return ret;
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}
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static long ec_device_ioctl_readmem(struct cros_ec_dev *ec, void __user *arg)
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{
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struct cros_ec_device *ec_dev = ec->ec_dev;
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struct cros_ec_readmem s_mem = { };
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long num;
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/* Not every platform supports direct reads */
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if (!ec_dev->cmd_readmem)
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return -ENOTTY;
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if (copy_from_user(&s_mem, arg, sizeof(s_mem)))
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return -EFAULT;
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num = ec_dev->cmd_readmem(ec_dev, s_mem.offset, s_mem.bytes,
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s_mem.buffer);
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if (num <= 0)
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return num;
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if (copy_to_user((void __user *)arg, &s_mem, sizeof(s_mem)))
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return -EFAULT;
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return num;
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}
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static long ec_device_ioctl(struct file *filp, unsigned int cmd,
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unsigned long arg)
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{
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struct cros_ec_dev *ec = filp->private_data;
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if (_IOC_TYPE(cmd) != CROS_EC_DEV_IOC)
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return -ENOTTY;
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switch (cmd) {
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case CROS_EC_DEV_IOCXCMD:
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return ec_device_ioctl_xcmd(ec, (void __user *)arg);
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case CROS_EC_DEV_IOCRDMEM:
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return ec_device_ioctl_readmem(ec, (void __user *)arg);
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}
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return -ENOTTY;
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}
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/* Module initialization */
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static const struct file_operations fops = {
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.open = ec_device_open,
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.release = ec_device_release,
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.read = ec_device_read,
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.unlocked_ioctl = ec_device_ioctl,
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#ifdef CONFIG_COMPAT
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.compat_ioctl = ec_device_ioctl,
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#endif
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};
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static void cros_ec_class_release(struct device *dev)
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{
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kfree(to_cros_ec_dev(dev));
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}
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static void cros_ec_sensors_register(struct cros_ec_dev *ec)
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{
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/*
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* Issue a command to get the number of sensor reported.
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* Build an array of sensors driver and register them all.
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*/
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int ret, i, id, sensor_num;
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struct mfd_cell *sensor_cells;
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struct cros_ec_sensor_platform *sensor_platforms;
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int sensor_type[MOTIONSENSE_TYPE_MAX];
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struct ec_params_motion_sense *params;
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struct ec_response_motion_sense *resp;
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struct cros_ec_command *msg;
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msg = kzalloc(sizeof(struct cros_ec_command) +
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max(sizeof(*params), sizeof(*resp)), GFP_KERNEL);
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if (msg == NULL)
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return;
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msg->version = 2;
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msg->command = EC_CMD_MOTION_SENSE_CMD + ec->cmd_offset;
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msg->outsize = sizeof(*params);
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msg->insize = sizeof(*resp);
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params = (struct ec_params_motion_sense *)msg->data;
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params->cmd = MOTIONSENSE_CMD_DUMP;
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ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
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if (ret < 0 || msg->result != EC_RES_SUCCESS) {
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dev_warn(ec->dev, "cannot get EC sensor information: %d/%d\n",
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ret, msg->result);
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goto error;
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}
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resp = (struct ec_response_motion_sense *)msg->data;
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sensor_num = resp->dump.sensor_count;
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/* Allocate 1 extra sensors in FIFO are needed */
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sensor_cells = kcalloc(sensor_num + 1, sizeof(struct mfd_cell),
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GFP_KERNEL);
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if (sensor_cells == NULL)
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goto error;
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sensor_platforms = kcalloc(sensor_num + 1,
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sizeof(struct cros_ec_sensor_platform),
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GFP_KERNEL);
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if (sensor_platforms == NULL)
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goto error_platforms;
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memset(sensor_type, 0, sizeof(sensor_type));
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id = 0;
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for (i = 0; i < sensor_num; i++) {
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params->cmd = MOTIONSENSE_CMD_INFO;
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params->info.sensor_num = i;
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ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
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if (ret < 0 || msg->result != EC_RES_SUCCESS) {
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dev_warn(ec->dev, "no info for EC sensor %d : %d/%d\n",
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i, ret, msg->result);
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continue;
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}
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switch (resp->info.type) {
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case MOTIONSENSE_TYPE_ACCEL:
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sensor_cells[id].name = "cros-ec-accel";
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break;
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case MOTIONSENSE_TYPE_BARO:
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sensor_cells[id].name = "cros-ec-baro";
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break;
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case MOTIONSENSE_TYPE_GYRO:
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sensor_cells[id].name = "cros-ec-gyro";
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break;
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case MOTIONSENSE_TYPE_MAG:
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sensor_cells[id].name = "cros-ec-mag";
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break;
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case MOTIONSENSE_TYPE_PROX:
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sensor_cells[id].name = "cros-ec-prox";
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break;
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case MOTIONSENSE_TYPE_LIGHT:
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sensor_cells[id].name = "cros-ec-light";
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break;
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case MOTIONSENSE_TYPE_ACTIVITY:
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sensor_cells[id].name = "cros-ec-activity";
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break;
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default:
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dev_warn(ec->dev, "unknown type %d\n", resp->info.type);
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continue;
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}
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sensor_platforms[id].sensor_num = i;
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sensor_cells[id].id = sensor_type[resp->info.type];
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sensor_cells[id].platform_data = &sensor_platforms[id];
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sensor_cells[id].pdata_size =
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sizeof(struct cros_ec_sensor_platform);
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sensor_type[resp->info.type]++;
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id++;
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}
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if (sensor_type[MOTIONSENSE_TYPE_ACCEL] >= 2)
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ec->has_kb_wake_angle = true;
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if (cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE_FIFO)) {
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sensor_cells[id].name = "cros-ec-ring";
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id++;
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}
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ret = mfd_add_devices(ec->dev, 0, sensor_cells, id,
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NULL, 0, NULL);
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if (ret)
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dev_err(ec->dev, "failed to add EC sensors\n");
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kfree(sensor_platforms);
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error_platforms:
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kfree(sensor_cells);
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error:
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kfree(msg);
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}
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static const struct mfd_cell cros_ec_cec_cells[] = {
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{ .name = "cros-ec-cec" }
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};
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static const struct mfd_cell cros_ec_rtc_cells[] = {
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{ .name = "cros-ec-rtc" }
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};
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static const struct mfd_cell cros_usbpd_charger_cells[] = {
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{ .name = "cros-usbpd-charger" }
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};
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static const struct mfd_cell cros_ec_platform_cells[] = {
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{ .name = "cros-ec-debugfs" },
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{ .name = "cros-ec-lightbar" },
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{ .name = "cros-ec-sysfs" },
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};
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static const struct mfd_cell cros_ec_vbc_cells[] = {
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{ .name = "cros-ec-vbc" }
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};
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static int ec_device_probe(struct platform_device *pdev)
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{
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int retval = -ENOMEM;
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struct device_node *node;
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struct device *dev = &pdev->dev;
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struct cros_ec_platform *ec_platform = dev_get_platdata(dev);
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struct cros_ec_dev *ec = kzalloc(sizeof(*ec), GFP_KERNEL);
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if (!ec)
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return retval;
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dev_set_drvdata(dev, ec);
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ec->ec_dev = dev_get_drvdata(dev->parent);
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ec->dev = dev;
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ec->cmd_offset = ec_platform->cmd_offset;
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ec->features[0] = -1U; /* Not cached yet */
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ec->features[1] = -1U; /* Not cached yet */
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device_initialize(&ec->class_dev);
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cdev_init(&ec->cdev, &fops);
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/*
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* Add the class device
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* Link to the character device for creating the /dev entry
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* in devtmpfs.
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*/
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ec->class_dev.devt = MKDEV(ec_major, pdev->id);
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ec->class_dev.class = &cros_class;
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ec->class_dev.parent = dev;
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ec->class_dev.release = cros_ec_class_release;
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retval = dev_set_name(&ec->class_dev, "%s", ec_platform->ec_name);
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if (retval) {
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dev_err(dev, "dev_set_name failed => %d\n", retval);
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goto failed;
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}
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/* check whether this EC is a sensor hub. */
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if (cros_ec_check_features(ec, EC_FEATURE_MOTION_SENSE))
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cros_ec_sensors_register(ec);
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/* Check whether this EC instance has CEC host command support */
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if (cros_ec_check_features(ec, EC_FEATURE_CEC)) {
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retval = mfd_add_devices(ec->dev, PLATFORM_DEVID_AUTO,
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cros_ec_cec_cells,
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ARRAY_SIZE(cros_ec_cec_cells),
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NULL, 0, NULL);
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if (retval)
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dev_err(ec->dev,
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"failed to add cros-ec-cec device: %d\n",
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retval);
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}
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/* Check whether this EC instance has RTC host command support */
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if (cros_ec_check_features(ec, EC_FEATURE_RTC)) {
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retval = mfd_add_devices(ec->dev, PLATFORM_DEVID_AUTO,
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cros_ec_rtc_cells,
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ARRAY_SIZE(cros_ec_rtc_cells),
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NULL, 0, NULL);
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if (retval)
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dev_err(ec->dev,
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"failed to add cros-ec-rtc device: %d\n",
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retval);
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}
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/* Check whether this EC instance has the PD charge manager */
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if (cros_ec_check_features(ec, EC_FEATURE_USB_PD)) {
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retval = mfd_add_devices(ec->dev, PLATFORM_DEVID_AUTO,
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cros_usbpd_charger_cells,
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ARRAY_SIZE(cros_usbpd_charger_cells),
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NULL, 0, NULL);
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if (retval)
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dev_err(ec->dev,
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"failed to add cros-usbpd-charger device: %d\n",
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retval);
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}
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/* We can now add the sysfs class, we know which parameter to show */
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retval = cdev_device_add(&ec->cdev, &ec->class_dev);
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if (retval) {
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dev_err(dev, "cdev_device_add failed => %d\n", retval);
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goto failed;
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}
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retval = mfd_add_devices(ec->dev, PLATFORM_DEVID_AUTO,
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cros_ec_platform_cells,
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ARRAY_SIZE(cros_ec_platform_cells),
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NULL, 0, NULL);
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if (retval)
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dev_warn(ec->dev,
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"failed to add cros-ec platform devices: %d\n",
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retval);
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/* Check whether this EC instance has a VBC NVRAM */
|
|
node = ec->ec_dev->dev->of_node;
|
|
if (of_property_read_bool(node, "google,has-vbc-nvram")) {
|
|
retval = mfd_add_devices(ec->dev, PLATFORM_DEVID_AUTO,
|
|
cros_ec_vbc_cells,
|
|
ARRAY_SIZE(cros_ec_vbc_cells),
|
|
NULL, 0, NULL);
|
|
if (retval)
|
|
dev_warn(ec->dev, "failed to add VBC devices: %d\n",
|
|
retval);
|
|
}
|
|
|
|
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);
|
|
|
|
mfd_remove_devices(ec->dev);
|
|
cdev_del(&ec->cdev);
|
|
device_unregister(&ec->class_dev);
|
|
return 0;
|
|
}
|
|
|
|
static const struct platform_device_id cros_ec_id[] = {
|
|
{ DRV_NAME, 0 },
|
|
{ /* sentinel */ }
|
|
};
|
|
MODULE_DEVICE_TABLE(platform, cros_ec_id);
|
|
|
|
static struct platform_driver cros_ec_dev_driver = {
|
|
.driver = {
|
|
.name = DRV_NAME,
|
|
},
|
|
.id_table = cros_ec_id,
|
|
.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_ALIAS("platform:" DRV_NAME);
|
|
MODULE_AUTHOR("Bill Richardson <wfrichar@chromium.org>");
|
|
MODULE_DESCRIPTION("Userspace interface to the Chrome OS Embedded Controller");
|
|
MODULE_VERSION("1.0");
|
|
MODULE_LICENSE("GPL");
|