- 根目录:
- drivers
- platform
- chrome
- cros_ec_sysfs.c
/*
* cros_ec_sysfs - expose the Chrome OS EC through sysfs
*
* 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/>.
*/
#define pr_fmt(fmt) "cros_ec_sysfs: " fmt
#include <linux/ctype.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/fs.h>
#include <linux/kobject.h>
#include <linux/mfd/cros_ec.h>
#include <linux/mfd/cros_ec_commands.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/printk.h>
#include <linux/slab.h>
#include <linux/stat.h>
#include <linux/types.h>
#include <linux/uaccess.h>
#include "cros_ec_dev.h"
/* Accessor functions */
static ssize_t show_ec_reboot(struct device *dev,
struct device_attribute *attr, char *buf)
{
int count = 0;
count += scnprintf(buf + count, PAGE_SIZE - count,
"ro|rw|cancel|cold|disable-jump|hibernate");
count += scnprintf(buf + count, PAGE_SIZE - count,
" [at-shutdown]\n");
return count;
}
static ssize_t store_ec_reboot(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
static const struct {
const char * const str;
uint8_t cmd;
uint8_t flags;
} words[] = {
{"cancel", EC_REBOOT_CANCEL, 0},
{"ro", EC_REBOOT_JUMP_RO, 0},
{"rw", EC_REBOOT_JUMP_RW, 0},
{"cold", EC_REBOOT_COLD, 0},
{"disable-jump", EC_REBOOT_DISABLE_JUMP, 0},
{"hibernate", EC_REBOOT_HIBERNATE, 0},
{"at-shutdown", -1, EC_REBOOT_FLAG_ON_AP_SHUTDOWN},
};
struct cros_ec_command *msg;
struct ec_params_reboot_ec *param;
int got_cmd = 0, offset = 0;
int i;
int ret;
struct cros_ec_dev *ec = container_of(dev,
struct cros_ec_dev, class_dev);
msg = kmalloc(sizeof(*msg) + sizeof(*param), GFP_KERNEL);
if (!msg)
return -ENOMEM;
param = (struct ec_params_reboot_ec *)msg->data;
param->flags = 0;
while (1) {
/* Find word to start scanning */
while (buf[offset] && isspace(buf[offset]))
offset++;
if (!buf[offset])
break;
for (i = 0; i < ARRAY_SIZE(words); i++) {
if (!strncasecmp(words[i].str, buf+offset,
strlen(words[i].str))) {
if (words[i].flags) {
param->flags |= words[i].flags;
} else {
param->cmd = words[i].cmd;
got_cmd = 1;
}
break;
}
}
/* On to the next word, if any */
while (buf[offset] && !isspace(buf[offset]))
offset++;
}
if (!got_cmd) {
count = -EINVAL;
goto exit;
}
msg->version = 0;
msg->command = EC_CMD_REBOOT_EC + ec->cmd_offset;
msg->outsize = sizeof(*param);
msg->insize = 0;
ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
if (ret < 0) {
count = ret;
goto exit;
}
if (msg->result != EC_RES_SUCCESS) {
dev_dbg(ec->dev, "EC result %d\n", msg->result);
count = -EINVAL;
}
exit:
kfree(msg);
return count;
}
static ssize_t show_ec_version(struct device *dev,
struct device_attribute *attr, char *buf)
{
static const char * const image_names[] = {"unknown", "RO", "RW"};
struct ec_response_get_version *r_ver;
struct ec_response_get_chip_info *r_chip;
struct ec_response_board_version *r_board;
struct cros_ec_command *msg;
int ret;
int count = 0;
struct cros_ec_dev *ec = container_of(dev,
struct cros_ec_dev, class_dev);
msg = kmalloc(sizeof(*msg) + EC_HOST_PARAM_SIZE, GFP_KERNEL);
if (!msg)
return -ENOMEM;
/* Get versions. RW may change. */
msg->version = 0;
msg->command = EC_CMD_GET_VERSION + ec->cmd_offset;
msg->insize = sizeof(*r_ver);
msg->outsize = 0;
ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
if (ret < 0) {
count = ret;
goto exit;
}
if (msg->result != EC_RES_SUCCESS) {
count = scnprintf(buf, PAGE_SIZE,
"ERROR: EC returned %d\n", msg->result);
goto exit;
}
r_ver = (struct ec_response_get_version *)msg->data;
/* Strings should be null-terminated, but let's be sure. */
r_ver->version_string_ro[sizeof(r_ver->version_string_ro) - 1] = '\0';
r_ver->version_string_rw[sizeof(r_ver->version_string_rw) - 1] = '\0';
count += scnprintf(buf + count, PAGE_SIZE - count,
"RO version: %s\n", r_ver->version_string_ro);
count += scnprintf(buf + count, PAGE_SIZE - count,
"RW version: %s\n", r_ver->version_string_rw);
count += scnprintf(buf + count, PAGE_SIZE - count,
"Firmware copy: %s\n",
(r_ver->current_image < ARRAY_SIZE(image_names) ?
image_names[r_ver->current_image] : "?"));
/* Get build info. */
msg->command = EC_CMD_GET_BUILD_INFO + ec->cmd_offset;
msg->insize = EC_HOST_PARAM_SIZE;
ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
if (ret < 0)
count += scnprintf(buf + count, PAGE_SIZE - count,
"Build info: XFER ERROR %d\n", ret);
else if (msg->result != EC_RES_SUCCESS)
count += scnprintf(buf + count, PAGE_SIZE - count,
"Build info: EC error %d\n", msg->result);
else {
msg->data[sizeof(msg->data) - 1] = '\0';
count += scnprintf(buf + count, PAGE_SIZE - count,
"Build info: %s\n", msg->data);
}
/* Get chip info. */
msg->command = EC_CMD_GET_CHIP_INFO + ec->cmd_offset;
msg->insize = sizeof(*r_chip);
ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
if (ret < 0)
count += scnprintf(buf + count, PAGE_SIZE - count,
"Chip info: XFER ERROR %d\n", ret);
else if (msg->result != EC_RES_SUCCESS)
count += scnprintf(buf + count, PAGE_SIZE - count,
"Chip info: EC error %d\n", msg->result);
else {
r_chip = (struct ec_response_get_chip_info *)msg->data;
r_chip->vendor[sizeof(r_chip->vendor) - 1] = '\0';
r_chip->name[sizeof(r_chip->name) - 1] = '\0';
r_chip->revision[sizeof(r_chip->revision) - 1] = '\0';
count += scnprintf(buf + count, PAGE_SIZE - count,
"Chip vendor: %s\n", r_chip->vendor);
count += scnprintf(buf + count, PAGE_SIZE - count,
"Chip name: %s\n", r_chip->name);
count += scnprintf(buf + count, PAGE_SIZE - count,
"Chip revision: %s\n", r_chip->revision);
}
/* Get board version */
msg->command = EC_CMD_GET_BOARD_VERSION + ec->cmd_offset;
msg->insize = sizeof(*r_board);
ret = cros_ec_cmd_xfer(ec->ec_dev, msg);
if (ret < 0)
count += scnprintf(buf + count, PAGE_SIZE - count,
"Board version: XFER ERROR %d\n", ret);
else if (msg->result != EC_RES_SUCCESS)
count += scnprintf(buf + count, PAGE_SIZE - count,
"Board version: EC error %d\n", msg->result);
else {
r_board = (struct ec_response_board_version *)msg->data;
count += scnprintf(buf + count, PAGE_SIZE - count,
"Board version: %d\n",
r_board->board_version);
}
exit:
kfree(msg);
return count;
}
static ssize_t show_ec_flashinfo(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct ec_response_flash_info *resp;
struct cros_ec_command *msg;
int ret;
struct cros_ec_dev *ec = container_of(dev,
struct cros_ec_dev, class_dev);
msg = kmalloc(sizeof(*msg) + sizeof(*resp), GFP_KERNEL);
if (!msg)
return -ENOMEM;
/* The flash info shouldn't ever change, but ask each time anyway. */
msg->version = 0;
msg->command = EC_CMD_FLASH_INFO + 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) {
ret = scnprintf(buf, PAGE_SIZE,
"ERROR: EC returned %d\n", msg->result);
goto exit;
}
resp = (struct ec_response_flash_info *)msg->data;
ret = scnprintf(buf, PAGE_SIZE,
"FlashSize %d\nWriteSize %d\n"
"EraseSize %d\nProtectSize %d\n",
resp->flash_size, resp->write_block_size,
resp->erase_block_size, resp->protect_block_size);
exit:
kfree(msg);
return ret;
}
/* Module initialization */
static DEVICE_ATTR(reboot, S_IWUSR | S_IRUGO, show_ec_reboot, store_ec_reboot);
static DEVICE_ATTR(version, S_IRUGO, show_ec_version, NULL);
static DEVICE_ATTR(flashinfo, S_IRUGO, show_ec_flashinfo, NULL);
static struct attribute *__ec_attrs[] = {
&dev_attr_reboot.attr,
&dev_attr_version.attr,
&dev_attr_flashinfo.attr,
NULL,
};
struct attribute_group cros_ec_attr_group = {
.attrs = __ec_attrs,
};