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372 lines
9.9 KiB
372 lines
9.9 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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// Expose the ChromeOS EC through sysfs |
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// |
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// Copyright (C) 2014 Google, Inc. |
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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/module.h> |
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#include <linux/platform_data/cros_ec_commands.h> |
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#include <linux/platform_data/cros_ec_proto.h> |
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#include <linux/platform_device.h> |
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#include <linux/printk.h> |
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#include <linux/slab.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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#define DRV_NAME "cros-ec-sysfs" |
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/* Accessor functions */ |
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static ssize_t reboot_show(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|cold-ap-off"); |
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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 reboot_store(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-ap-off", EC_REBOOT_COLD_AP_OFF, 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; |
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struct ec_params_reboot_ec *param; |
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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_dev *ec = to_cros_ec_dev(dev); |
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msg = kmalloc(sizeof(*msg) + sizeof(*param), GFP_KERNEL); |
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if (!msg) |
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return -ENOMEM; |
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param = (struct ec_params_reboot_ec *)msg->data; |
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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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count = -EINVAL; |
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goto exit; |
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} |
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msg->version = 0; |
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msg->command = EC_CMD_REBOOT_EC + ec->cmd_offset; |
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msg->outsize = sizeof(*param); |
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msg->insize = 0; |
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ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg); |
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if (ret < 0) |
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count = ret; |
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exit: |
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kfree(msg); |
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return count; |
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} |
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static ssize_t version_show(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; |
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int ret; |
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int count = 0; |
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struct cros_ec_dev *ec = to_cros_ec_dev(dev); |
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msg = kmalloc(sizeof(*msg) + EC_HOST_PARAM_SIZE, GFP_KERNEL); |
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if (!msg) |
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return -ENOMEM; |
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/* Get versions. RW may change. */ |
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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(*r_ver); |
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msg->outsize = 0; |
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ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg); |
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if (ret < 0) { |
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count = ret; |
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goto exit; |
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} |
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r_ver = (struct ec_response_get_version *)msg->data; |
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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 + ec->cmd_offset; |
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msg->insize = EC_HOST_PARAM_SIZE; |
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ret = cros_ec_cmd_xfer_status(ec->ec_dev, 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 / EC ERROR %d / %d\n", |
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ret, msg->result); |
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} else { |
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msg->data[EC_HOST_PARAM_SIZE - 1] = '\0'; |
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count += scnprintf(buf + count, PAGE_SIZE - count, |
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"Build info: %s\n", msg->data); |
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} |
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/* Get chip info. */ |
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msg->command = EC_CMD_GET_CHIP_INFO + ec->cmd_offset; |
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msg->insize = sizeof(*r_chip); |
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ret = cros_ec_cmd_xfer_status(ec->ec_dev, 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 / EC ERROR %d / %d\n", |
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ret, msg->result); |
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} else { |
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r_chip = (struct ec_response_get_chip_info *)msg->data; |
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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 + ec->cmd_offset; |
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msg->insize = sizeof(*r_board); |
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ret = cros_ec_cmd_xfer_status(ec->ec_dev, 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 / EC ERROR %d / %d\n", |
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ret, msg->result); |
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} else { |
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r_board = (struct ec_response_board_version *)msg->data; |
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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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exit: |
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kfree(msg); |
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return count; |
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} |
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static ssize_t flashinfo_show(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; |
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int ret; |
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struct cros_ec_dev *ec = to_cros_ec_dev(dev); |
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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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/* The flash info shouldn't ever change, but ask each time anyway. */ |
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msg->version = 0; |
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msg->command = EC_CMD_FLASH_INFO + 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_status(ec->ec_dev, msg); |
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if (ret < 0) |
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goto exit; |
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resp = (struct ec_response_flash_info *)msg->data; |
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ret = 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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exit: |
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kfree(msg); |
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return ret; |
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} |
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/* Keyboard wake angle control */ |
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static ssize_t kb_wake_angle_show(struct device *dev, |
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struct device_attribute *attr, char *buf) |
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{ |
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struct cros_ec_dev *ec = to_cros_ec_dev(dev); |
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struct ec_response_motion_sense *resp; |
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struct ec_params_motion_sense *param; |
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struct cros_ec_command *msg; |
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int ret; |
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msg = kmalloc(sizeof(*msg) + EC_HOST_PARAM_SIZE, GFP_KERNEL); |
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if (!msg) |
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return -ENOMEM; |
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param = (struct ec_params_motion_sense *)msg->data; |
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msg->command = EC_CMD_MOTION_SENSE_CMD + ec->cmd_offset; |
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msg->version = 2; |
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param->cmd = MOTIONSENSE_CMD_KB_WAKE_ANGLE; |
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param->kb_wake_angle.data = EC_MOTION_SENSE_NO_VALUE; |
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msg->outsize = sizeof(*param); |
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msg->insize = sizeof(*resp); |
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ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg); |
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if (ret < 0) |
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goto exit; |
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resp = (struct ec_response_motion_sense *)msg->data; |
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ret = scnprintf(buf, PAGE_SIZE, "%d\n", resp->kb_wake_angle.ret); |
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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 ssize_t kb_wake_angle_store(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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struct cros_ec_dev *ec = to_cros_ec_dev(dev); |
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struct ec_params_motion_sense *param; |
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struct cros_ec_command *msg; |
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u16 angle; |
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int ret; |
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ret = kstrtou16(buf, 0, &angle); |
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if (ret) |
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return ret; |
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msg = kmalloc(sizeof(*msg) + EC_HOST_PARAM_SIZE, GFP_KERNEL); |
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if (!msg) |
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return -ENOMEM; |
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param = (struct ec_params_motion_sense *)msg->data; |
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msg->command = EC_CMD_MOTION_SENSE_CMD + ec->cmd_offset; |
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msg->version = 2; |
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param->cmd = MOTIONSENSE_CMD_KB_WAKE_ANGLE; |
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param->kb_wake_angle.data = angle; |
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msg->outsize = sizeof(*param); |
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msg->insize = sizeof(struct ec_response_motion_sense); |
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ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg); |
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kfree(msg); |
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if (ret < 0) |
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return ret; |
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return count; |
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} |
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/* Module initialization */ |
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static DEVICE_ATTR_RW(reboot); |
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static DEVICE_ATTR_RO(version); |
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static DEVICE_ATTR_RO(flashinfo); |
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static DEVICE_ATTR_RW(kb_wake_angle); |
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static struct attribute *__ec_attrs[] = { |
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&dev_attr_kb_wake_angle.attr, |
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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 umode_t cros_ec_ctrl_visible(struct kobject *kobj, |
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struct attribute *a, int n) |
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{ |
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struct device *dev = kobj_to_dev(kobj); |
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struct cros_ec_dev *ec = to_cros_ec_dev(dev); |
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if (a == &dev_attr_kb_wake_angle.attr && !ec->has_kb_wake_angle) |
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return 0; |
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return a->mode; |
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} |
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static const struct attribute_group cros_ec_attr_group = { |
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.attrs = __ec_attrs, |
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.is_visible = cros_ec_ctrl_visible, |
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}; |
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static int cros_ec_sysfs_probe(struct platform_device *pd) |
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{ |
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struct cros_ec_dev *ec_dev = dev_get_drvdata(pd->dev.parent); |
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struct device *dev = &pd->dev; |
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int ret; |
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ret = sysfs_create_group(&ec_dev->class_dev.kobj, &cros_ec_attr_group); |
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if (ret < 0) |
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dev_err(dev, "failed to create attributes. err=%d\n", ret); |
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return ret; |
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} |
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static int cros_ec_sysfs_remove(struct platform_device *pd) |
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{ |
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struct cros_ec_dev *ec_dev = dev_get_drvdata(pd->dev.parent); |
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sysfs_remove_group(&ec_dev->class_dev.kobj, &cros_ec_attr_group); |
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return 0; |
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} |
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static struct platform_driver cros_ec_sysfs_driver = { |
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.driver = { |
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.name = DRV_NAME, |
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}, |
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.probe = cros_ec_sysfs_probe, |
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.remove = cros_ec_sysfs_remove, |
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}; |
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module_platform_driver(cros_ec_sysfs_driver); |
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MODULE_LICENSE("GPL"); |
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MODULE_DESCRIPTION("Expose the ChromeOS EC through sysfs"); |
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MODULE_ALIAS("platform:" DRV_NAME);
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