| // SPDX-License-Identifier: GPL-2.0+ |
| // Expose the ChromeOS EC through sysfs |
| // |
| // Copyright (C) 2014 Google, Inc. |
| |
| #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/module.h> |
| #include <linux/platform_data/cros_ec_commands.h> |
| #include <linux/platform_data/cros_ec_proto.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> |
| |
| #define DRV_NAME "cros-ec-sysfs" |
| |
| /* Accessor functions */ |
| |
| static ssize_t reboot_show(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 reboot_store(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 = to_cros_ec_dev(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_status(ec->ec_dev, msg); |
| if (ret < 0) |
| count = ret; |
| exit: |
| kfree(msg); |
| return count; |
| } |
| |
| static ssize_t version_show(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 = to_cros_ec_dev(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_status(ec->ec_dev, msg); |
| if (ret < 0) { |
| count = ret; |
| 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[EC_HOST_PARAM_SIZE - 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 flashinfo_show(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 = to_cros_ec_dev(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_status(ec->ec_dev, msg); |
| if (ret < 0) |
| 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; |
| } |
| |
| /* Keyboard wake angle control */ |
| static ssize_t kb_wake_angle_show(struct device *dev, |
| struct device_attribute *attr, char *buf) |
| { |
| struct cros_ec_dev *ec = to_cros_ec_dev(dev); |
| struct ec_response_motion_sense *resp; |
| struct ec_params_motion_sense *param; |
| struct cros_ec_command *msg; |
| int ret; |
| |
| msg = kmalloc(sizeof(*msg) + EC_HOST_PARAM_SIZE, GFP_KERNEL); |
| if (!msg) |
| return -ENOMEM; |
| |
| param = (struct ec_params_motion_sense *)msg->data; |
| msg->command = EC_CMD_MOTION_SENSE_CMD + ec->cmd_offset; |
| msg->version = 2; |
| param->cmd = MOTIONSENSE_CMD_KB_WAKE_ANGLE; |
| param->kb_wake_angle.data = EC_MOTION_SENSE_NO_VALUE; |
| msg->outsize = sizeof(*param); |
| msg->insize = sizeof(*resp); |
| |
| ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg); |
| if (ret < 0) |
| goto exit; |
| |
| resp = (struct ec_response_motion_sense *)msg->data; |
| ret = scnprintf(buf, PAGE_SIZE, "%d\n", resp->kb_wake_angle.ret); |
| exit: |
| kfree(msg); |
| return ret; |
| } |
| |
| static ssize_t kb_wake_angle_store(struct device *dev, |
| struct device_attribute *attr, |
| const char *buf, size_t count) |
| { |
| struct cros_ec_dev *ec = to_cros_ec_dev(dev); |
| struct ec_params_motion_sense *param; |
| struct cros_ec_command *msg; |
| u16 angle; |
| int ret; |
| |
| ret = kstrtou16(buf, 0, &angle); |
| if (ret) |
| return ret; |
| |
| msg = kmalloc(sizeof(*msg) + EC_HOST_PARAM_SIZE, GFP_KERNEL); |
| if (!msg) |
| return -ENOMEM; |
| |
| param = (struct ec_params_motion_sense *)msg->data; |
| msg->command = EC_CMD_MOTION_SENSE_CMD + ec->cmd_offset; |
| msg->version = 2; |
| param->cmd = MOTIONSENSE_CMD_KB_WAKE_ANGLE; |
| param->kb_wake_angle.data = angle; |
| msg->outsize = sizeof(*param); |
| msg->insize = sizeof(struct ec_response_motion_sense); |
| |
| ret = cros_ec_cmd_xfer_status(ec->ec_dev, msg); |
| kfree(msg); |
| if (ret < 0) |
| return ret; |
| return count; |
| } |
| |
| /* Module initialization */ |
| |
| static DEVICE_ATTR_RW(reboot); |
| static DEVICE_ATTR_RO(version); |
| static DEVICE_ATTR_RO(flashinfo); |
| static DEVICE_ATTR_RW(kb_wake_angle); |
| |
| static struct attribute *__ec_attrs[] = { |
| &dev_attr_kb_wake_angle.attr, |
| &dev_attr_reboot.attr, |
| &dev_attr_version.attr, |
| &dev_attr_flashinfo.attr, |
| NULL, |
| }; |
| |
| static umode_t cros_ec_ctrl_visible(struct kobject *kobj, |
| struct attribute *a, int n) |
| { |
| struct device *dev = container_of(kobj, struct device, kobj); |
| struct cros_ec_dev *ec = to_cros_ec_dev(dev); |
| |
| if (a == &dev_attr_kb_wake_angle.attr && !ec->has_kb_wake_angle) |
| return 0; |
| |
| return a->mode; |
| } |
| |
| static struct attribute_group cros_ec_attr_group = { |
| .attrs = __ec_attrs, |
| .is_visible = cros_ec_ctrl_visible, |
| }; |
| |
| static int cros_ec_sysfs_probe(struct platform_device *pd) |
| { |
| struct cros_ec_dev *ec_dev = dev_get_drvdata(pd->dev.parent); |
| struct device *dev = &pd->dev; |
| int ret; |
| |
| ret = sysfs_create_group(&ec_dev->class_dev.kobj, &cros_ec_attr_group); |
| if (ret < 0) |
| dev_err(dev, "failed to create attributes. err=%d\n", ret); |
| |
| return ret; |
| } |
| |
| static int cros_ec_sysfs_remove(struct platform_device *pd) |
| { |
| struct cros_ec_dev *ec_dev = dev_get_drvdata(pd->dev.parent); |
| |
| sysfs_remove_group(&ec_dev->class_dev.kobj, &cros_ec_attr_group); |
| |
| return 0; |
| } |
| |
| static struct platform_driver cros_ec_sysfs_driver = { |
| .driver = { |
| .name = DRV_NAME, |
| }, |
| .probe = cros_ec_sysfs_probe, |
| .remove = cros_ec_sysfs_remove, |
| }; |
| |
| module_platform_driver(cros_ec_sysfs_driver); |
| |
| MODULE_LICENSE("GPL"); |
| MODULE_DESCRIPTION("Expose the ChromeOS EC through sysfs"); |
| MODULE_ALIAS("platform:" DRV_NAME); |