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platform/chrome: Create sysfs attributes for the ChromeOS EC
This adds the first few sysfs attributes for the Chrome OS EC. These
controls are made available under /sys/devices/virtual/chromeos/cros_ec
flashinfo - display current flash info
reboot - tell the EC to reboot in various ways
version - information about the EC software and hardware
Future changes will build on this to add additional controls.
From a root shell, you should be able to do things like this:
cd /sys/devices/virtual/chromeos/cros_ec
cat flashinfo
cat version
echo rw > reboot
cat version
echo ro > reboot
cat version
echo rw > reboot
cat version
echo cold > reboot
That last command will reboot the AP too.
Signed-off-by: Bill Richardson <wfrichar@chromium.org>
Reviewed-by: Olof Johansson <olofj@chromium.org>
Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Tested-by: Gwendal Grignou <gwendal@chromium.org>
Reviewed-by: Gwendal Grignou <gwendal@chromium.org>
Signed-off-by: Olof Johansson <olof@lixom.net>
This commit is contained in:
Bill Richardson
Olof Johansson
parent
8a4be850b6
commit
71af4b52cc
@ -1,5 +1,6 @@
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obj-$(CONFIG_CHROMEOS_LAPTOP) += chromeos_laptop.o
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obj-$(CONFIG_CHROMEOS_PSTORE) += chromeos_pstore.o
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obj-$(CONFIG_CROS_EC_CHARDEV) += cros_ec_dev.o
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cros_ec_devs-objs := cros_ec_dev.o cros_ec_sysfs.o
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obj-$(CONFIG_CROS_EC_CHARDEV) += cros_ec_devs.o
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obj-$(CONFIG_CROS_EC_LPC) += cros_ec_lpc.o
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@ -198,6 +198,9 @@ static int ec_device_probe(struct platform_device *pdev)
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return retval;
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}
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/* Initialize extra interfaces */
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ec_dev_sysfs_init(ec);
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return 0;
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}
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@ -205,6 +208,7 @@ static int ec_device_remove(struct platform_device *pdev)
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{
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struct cros_ec_device *ec = dev_get_drvdata(pdev->dev.parent);
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ec_dev_sysfs_remove(ec);
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device_destroy(cros_class, MKDEV(ec_major, 0));
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cdev_del(&ec->cdev);
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return 0;
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@ -44,4 +44,7 @@ struct cros_ec_readmem {
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#define CROS_EC_DEV_IOCXCMD _IOWR(CROS_EC_DEV_IOC, 0, struct cros_ec_command)
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#define CROS_EC_DEV_IOCRDMEM _IOWR(CROS_EC_DEV_IOC, 1, struct cros_ec_readmem)
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void ec_dev_sysfs_init(struct cros_ec_device *);
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void ec_dev_sysfs_remove(struct cros_ec_device *);
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#endif /* _CROS_EC_DEV_H_ */
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271
drivers/platform/chrome/cros_ec_sysfs.c
Normal file
271
drivers/platform/chrome/cros_ec_sysfs.c
Normal file
@ -0,0 +1,271 @@
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/*
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* cros_ec_sysfs - expose the Chrome OS EC through sysfs
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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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#define pr_fmt(fmt) "cros_ec_sysfs: " fmt
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#include <linux/ctype.h>
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/fs.h>
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#include <linux/kobject.h>
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#include <linux/mfd/cros_ec.h>
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#include <linux/mfd/cros_ec_commands.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/printk.h>
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#include <linux/stat.h>
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#include <linux/types.h>
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#include <linux/uaccess.h>
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#include "cros_ec_dev.h"
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/* Accessor functions */
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static ssize_t show_ec_reboot(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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int count = 0;
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count += scnprintf(buf + count, PAGE_SIZE - count,
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"ro|rw|cancel|cold|disable-jump|hibernate");
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count += scnprintf(buf + count, PAGE_SIZE - count,
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" [at-shutdown]\n");
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return count;
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}
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static ssize_t store_ec_reboot(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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static const struct {
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const char * const str;
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uint8_t cmd;
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uint8_t flags;
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} words[] = {
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{"cancel", EC_REBOOT_CANCEL, 0},
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{"ro", EC_REBOOT_JUMP_RO, 0},
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{"rw", EC_REBOOT_JUMP_RW, 0},
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{"cold", EC_REBOOT_COLD, 0},
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{"disable-jump", EC_REBOOT_DISABLE_JUMP, 0},
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{"hibernate", EC_REBOOT_HIBERNATE, 0},
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{"at-shutdown", -1, EC_REBOOT_FLAG_ON_AP_SHUTDOWN},
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};
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struct cros_ec_command msg = { 0 };
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struct ec_params_reboot_ec *param =
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(struct ec_params_reboot_ec *)msg.outdata;
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int got_cmd = 0, offset = 0;
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int i;
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int ret;
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struct cros_ec_device *ec = dev_get_drvdata(dev);
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param->flags = 0;
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while (1) {
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/* Find word to start scanning */
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while (buf[offset] && isspace(buf[offset]))
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offset++;
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if (!buf[offset])
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break;
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for (i = 0; i < ARRAY_SIZE(words); i++) {
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if (!strncasecmp(words[i].str, buf+offset,
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strlen(words[i].str))) {
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if (words[i].flags) {
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param->flags |= words[i].flags;
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} else {
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param->cmd = words[i].cmd;
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got_cmd = 1;
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}
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break;
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}
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}
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/* On to the next word, if any */
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while (buf[offset] && !isspace(buf[offset]))
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offset++;
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}
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if (!got_cmd)
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return -EINVAL;
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msg.command = EC_CMD_REBOOT_EC;
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msg.outsize = sizeof(param);
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ret = cros_ec_cmd_xfer(ec, &msg);
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if (ret < 0)
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return ret;
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if (msg.result != EC_RES_SUCCESS) {
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dev_dbg(ec->dev, "EC result %d\n", msg.result);
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return -EINVAL;
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}
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return count;
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}
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static ssize_t show_ec_version(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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static const char * const image_names[] = {"unknown", "RO", "RW"};
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struct ec_response_get_version *r_ver;
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struct ec_response_get_chip_info *r_chip;
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struct ec_response_board_version *r_board;
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struct cros_ec_command msg = { 0 };
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int ret;
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int count = 0;
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struct cros_ec_device *ec = dev_get_drvdata(dev);
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/* Get versions. RW may change. */
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msg.command = EC_CMD_GET_VERSION;
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msg.insize = sizeof(*r_ver);
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ret = cros_ec_cmd_xfer(ec, &msg);
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if (ret < 0)
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return ret;
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if (msg.result != EC_RES_SUCCESS)
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return scnprintf(buf, PAGE_SIZE,
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"ERROR: EC returned %d\n", msg.result);
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r_ver = (struct ec_response_get_version *)msg.indata;
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/* Strings should be null-terminated, but let's be sure. */
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r_ver->version_string_ro[sizeof(r_ver->version_string_ro) - 1] = '\0';
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r_ver->version_string_rw[sizeof(r_ver->version_string_rw) - 1] = '\0';
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count += scnprintf(buf + count, PAGE_SIZE - count,
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"RO version: %s\n", r_ver->version_string_ro);
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count += scnprintf(buf + count, PAGE_SIZE - count,
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"RW version: %s\n", r_ver->version_string_rw);
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count += scnprintf(buf + count, PAGE_SIZE - count,
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"Firmware copy: %s\n",
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(r_ver->current_image < ARRAY_SIZE(image_names) ?
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image_names[r_ver->current_image] : "?"));
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/* Get build info. */
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msg.command = EC_CMD_GET_BUILD_INFO;
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msg.insize = sizeof(msg.indata);
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ret = cros_ec_cmd_xfer(ec, &msg);
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if (ret < 0)
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count += scnprintf(buf + count, PAGE_SIZE - count,
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"Build info: XFER ERROR %d\n", ret);
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else if (msg.result != EC_RES_SUCCESS)
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count += scnprintf(buf + count, PAGE_SIZE - count,
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"Build info: EC error %d\n", msg.result);
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else {
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msg.indata[sizeof(msg.indata) - 1] = '\0';
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count += scnprintf(buf + count, PAGE_SIZE - count,
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"Build info: %s\n", msg.indata);
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}
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/* Get chip info. */
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msg.command = EC_CMD_GET_CHIP_INFO;
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msg.insize = sizeof(*r_chip);
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ret = cros_ec_cmd_xfer(ec, &msg);
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if (ret < 0)
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count += scnprintf(buf + count, PAGE_SIZE - count,
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"Chip info: XFER ERROR %d\n", ret);
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else if (msg.result != EC_RES_SUCCESS)
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count += scnprintf(buf + count, PAGE_SIZE - count,
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"Chip info: EC error %d\n", msg.result);
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else {
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r_chip = (struct ec_response_get_chip_info *)msg.indata;
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r_chip->vendor[sizeof(r_chip->vendor) - 1] = '\0';
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r_chip->name[sizeof(r_chip->name) - 1] = '\0';
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r_chip->revision[sizeof(r_chip->revision) - 1] = '\0';
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count += scnprintf(buf + count, PAGE_SIZE - count,
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"Chip vendor: %s\n", r_chip->vendor);
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count += scnprintf(buf + count, PAGE_SIZE - count,
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"Chip name: %s\n", r_chip->name);
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count += scnprintf(buf + count, PAGE_SIZE - count,
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"Chip revision: %s\n", r_chip->revision);
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}
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/* Get board version */
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msg.command = EC_CMD_GET_BOARD_VERSION;
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msg.insize = sizeof(*r_board);
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ret = cros_ec_cmd_xfer(ec, &msg);
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if (ret < 0)
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count += scnprintf(buf + count, PAGE_SIZE - count,
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"Board version: XFER ERROR %d\n", ret);
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else if (msg.result != EC_RES_SUCCESS)
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count += scnprintf(buf + count, PAGE_SIZE - count,
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"Board version: EC error %d\n", msg.result);
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else {
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r_board = (struct ec_response_board_version *)msg.indata;
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count += scnprintf(buf + count, PAGE_SIZE - count,
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"Board version: %d\n",
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r_board->board_version);
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}
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return count;
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}
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static ssize_t show_ec_flashinfo(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct ec_response_flash_info *resp;
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struct cros_ec_command msg = { 0 };
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int ret;
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struct cros_ec_device *ec = dev_get_drvdata(dev);
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/* The flash info shouldn't ever change, but ask each time anyway. */
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msg.command = EC_CMD_FLASH_INFO;
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msg.insize = sizeof(*resp);
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ret = cros_ec_cmd_xfer(ec, &msg);
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if (ret < 0)
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return ret;
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if (msg.result != EC_RES_SUCCESS)
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return scnprintf(buf, PAGE_SIZE,
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"ERROR: EC returned %d\n", msg.result);
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resp = (struct ec_response_flash_info *)msg.indata;
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return scnprintf(buf, PAGE_SIZE,
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"FlashSize %d\nWriteSize %d\n"
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"EraseSize %d\nProtectSize %d\n",
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resp->flash_size, resp->write_block_size,
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resp->erase_block_size, resp->protect_block_size);
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}
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/* Module initialization */
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static DEVICE_ATTR(reboot, S_IWUSR | S_IRUGO, show_ec_reboot, store_ec_reboot);
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static DEVICE_ATTR(version, S_IRUGO, show_ec_version, NULL);
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static DEVICE_ATTR(flashinfo, S_IRUGO, show_ec_flashinfo, NULL);
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static struct attribute *__ec_attrs[] = {
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&dev_attr_reboot.attr,
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&dev_attr_version.attr,
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&dev_attr_flashinfo.attr,
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NULL,
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};
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static struct attribute_group ec_attr_group = {
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.attrs = __ec_attrs,
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};
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void ec_dev_sysfs_init(struct cros_ec_device *ec)
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{
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int error;
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error = sysfs_create_group(&ec->vdev->kobj, &ec_attr_group);
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if (error)
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pr_warn("failed to create group: %d\n", error);
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}
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void ec_dev_sysfs_remove(struct cros_ec_device *ec)
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{
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sysfs_remove_group(&ec->vdev->kobj, &ec_attr_group);
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}
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