| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Mario Limonciello | 2539 | 82.92% | 10 | 50.00% |
| Michał Kępień | 428 | 13.98% | 6 | 30.00% |
| Hans de Goede | 82 | 2.68% | 1 | 5.00% |
| Arnd Bergmann | 8 | 0.26% | 1 | 5.00% |
| Dan Carpenter | 4 | 0.13% | 1 | 5.00% |
| Darren Hart | 1 | 0.03% | 1 | 5.00% |
| Total | 3062 | 20 |
/* * Common functions for kernel modules using Dell SMBIOS * * Copyright (c) Red Hat <mjg@redhat.com> * Copyright (c) 2014 Gabriele Mazzotta <gabriele.mzt@gmail.com> * Copyright (c) 2014 Pali Rohár <pali.rohar@gmail.com> * * Based on documentation in the libsmbios package: * Copyright (C) 2005-2014 Dell Inc. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 as * published by the Free Software Foundation. */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include <linux/kernel.h> #include <linux/module.h> #include <linux/capability.h> #include <linux/dmi.h> #include <linux/err.h> #include <linux/mutex.h> #include <linux/platform_device.h> #include <linux/slab.h> #include "dell-smbios.h" static u32 da_supported_commands; static int da_num_tokens; static struct platform_device *platform_device; static struct calling_interface_token *da_tokens; static struct device_attribute *token_location_attrs; static struct device_attribute *token_value_attrs; static struct attribute **token_attrs; static DEFINE_MUTEX(smbios_mutex); struct smbios_device { struct list_head list; struct device *device; int (*call_fn)(struct calling_interface_buffer *arg); }; struct smbios_call { u32 need_capability; int cmd_class; int cmd_select; }; /* calls that are whitelisted for given capabilities */ static struct smbios_call call_whitelist[] = { /* generally tokens are allowed, but may be further filtered or * restricted by token blacklist or whitelist */ {CAP_SYS_ADMIN, CLASS_TOKEN_READ, SELECT_TOKEN_STD}, {CAP_SYS_ADMIN, CLASS_TOKEN_READ, SELECT_TOKEN_AC}, {CAP_SYS_ADMIN, CLASS_TOKEN_READ, SELECT_TOKEN_BAT}, {CAP_SYS_ADMIN, CLASS_TOKEN_WRITE, SELECT_TOKEN_STD}, {CAP_SYS_ADMIN, CLASS_TOKEN_WRITE, SELECT_TOKEN_AC}, {CAP_SYS_ADMIN, CLASS_TOKEN_WRITE, SELECT_TOKEN_BAT}, /* used by userspace: fwupdate */ {CAP_SYS_ADMIN, CLASS_ADMIN_PROP, SELECT_ADMIN_PROP}, /* used by userspace: fwupd */ {CAP_SYS_ADMIN, CLASS_INFO, SELECT_DOCK}, {CAP_SYS_ADMIN, CLASS_FLASH_INTERFACE, SELECT_FLASH_INTERFACE}, }; /* calls that are explicitly blacklisted */ static struct smbios_call call_blacklist[] = { {0x0000, 1, 7}, /* manufacturing use */ {0x0000, 6, 5}, /* manufacturing use */ {0x0000, 11, 3}, /* write once */ {0x0000, 11, 7}, /* write once */ {0x0000, 11, 11}, /* write once */ {0x0000, 19, -1}, /* diagnostics */ /* handled by kernel: dell-laptop */ {0x0000, CLASS_INFO, SELECT_RFKILL}, {0x0000, CLASS_KBD_BACKLIGHT, SELECT_KBD_BACKLIGHT}, }; struct token_range { u32 need_capability; u16 min; u16 max; }; /* tokens that are whitelisted for given capabilities */ static struct token_range token_whitelist[] = { /* used by userspace: fwupdate */ {CAP_SYS_ADMIN, CAPSULE_EN_TOKEN, CAPSULE_DIS_TOKEN}, /* can indicate to userspace that WMI is needed */ {0x0000, WSMT_EN_TOKEN, WSMT_DIS_TOKEN} }; /* tokens that are explicitly blacklisted */ static struct token_range token_blacklist[] = { {0x0000, 0x0058, 0x0059}, /* ME use */ {0x0000, 0x00CD, 0x00D0}, /* raid shadow copy */ {0x0000, 0x013A, 0x01FF}, /* sata shadow copy */ {0x0000, 0x0175, 0x0176}, /* write once */ {0x0000, 0x0195, 0x0197}, /* diagnostics */ {0x0000, 0x01DC, 0x01DD}, /* manufacturing use */ {0x0000, 0x027D, 0x0284}, /* diagnostics */ {0x0000, 0x02E3, 0x02E3}, /* manufacturing use */ {0x0000, 0x02FF, 0x02FF}, /* manufacturing use */ {0x0000, 0x0300, 0x0302}, /* manufacturing use */ {0x0000, 0x0325, 0x0326}, /* manufacturing use */ {0x0000, 0x0332, 0x0335}, /* fan control */ {0x0000, 0x0350, 0x0350}, /* manufacturing use */ {0x0000, 0x0363, 0x0363}, /* manufacturing use */ {0x0000, 0x0368, 0x0368}, /* manufacturing use */ {0x0000, 0x03F6, 0x03F7}, /* manufacturing use */ {0x0000, 0x049E, 0x049F}, /* manufacturing use */ {0x0000, 0x04A0, 0x04A3}, /* disagnostics */ {0x0000, 0x04E6, 0x04E7}, /* manufacturing use */ {0x0000, 0x4000, 0x7FFF}, /* internal BIOS use */ {0x0000, 0x9000, 0x9001}, /* internal BIOS use */ {0x0000, 0xA000, 0xBFFF}, /* write only */ {0x0000, 0xEFF0, 0xEFFF}, /* internal BIOS use */ /* handled by kernel: dell-laptop */ {0x0000, BRIGHTNESS_TOKEN, BRIGHTNESS_TOKEN}, {0x0000, KBD_LED_OFF_TOKEN, KBD_LED_AUTO_TOKEN}, {0x0000, KBD_LED_AC_TOKEN, KBD_LED_AC_TOKEN}, {0x0000, KBD_LED_AUTO_25_TOKEN, KBD_LED_AUTO_75_TOKEN}, {0x0000, KBD_LED_AUTO_100_TOKEN, KBD_LED_AUTO_100_TOKEN}, {0x0000, GLOBAL_MIC_MUTE_ENABLE, GLOBAL_MIC_MUTE_DISABLE}, }; static LIST_HEAD(smbios_device_list); int dell_smbios_error(int value) { switch (value) { case 0: /* Completed successfully */ return 0; case -1: /* Completed with error */ return -EIO; case -2: /* Function not supported */ return -ENXIO; default: /* Unknown error */ return -EINVAL; } } EXPORT_SYMBOL_GPL(dell_smbios_error); int dell_smbios_register_device(struct device *d, void *call_fn) { struct smbios_device *priv; priv = devm_kzalloc(d, sizeof(struct smbios_device), GFP_KERNEL); if (!priv) return -ENOMEM; get_device(d); priv->device = d; priv->call_fn = call_fn; mutex_lock(&smbios_mutex); list_add_tail(&priv->list, &smbios_device_list); mutex_unlock(&smbios_mutex); dev_dbg(d, "Added device: %s\n", d->driver->name); return 0; } EXPORT_SYMBOL_GPL(dell_smbios_register_device); void dell_smbios_unregister_device(struct device *d) { struct smbios_device *priv; mutex_lock(&smbios_mutex); list_for_each_entry(priv, &smbios_device_list, list) { if (priv->device == d) { list_del(&priv->list); put_device(d); break; } } mutex_unlock(&smbios_mutex); dev_dbg(d, "Remove device: %s\n", d->driver->name); } EXPORT_SYMBOL_GPL(dell_smbios_unregister_device); int dell_smbios_call_filter(struct device *d, struct calling_interface_buffer *buffer) { u16 t = 0; int i; /* can't make calls over 30 */ if (buffer->cmd_class > 30) { dev_dbg(d, "class too big: %u\n", buffer->cmd_class); return -EINVAL; } /* supported calls on the particular system */ if (!(da_supported_commands & (1 << buffer->cmd_class))) { dev_dbg(d, "invalid command, supported commands: 0x%8x\n", da_supported_commands); return -EINVAL; } /* match against call blacklist */ for (i = 0; i < ARRAY_SIZE(call_blacklist); i++) { if (buffer->cmd_class != call_blacklist[i].cmd_class) continue; if (buffer->cmd_select != call_blacklist[i].cmd_select && call_blacklist[i].cmd_select != -1) continue; dev_dbg(d, "blacklisted command: %u/%u\n", buffer->cmd_class, buffer->cmd_select); return -EINVAL; } /* if a token call, find token ID */ if ((buffer->cmd_class == CLASS_TOKEN_READ || buffer->cmd_class == CLASS_TOKEN_WRITE) && buffer->cmd_select < 3) { /* tokens enabled ? */ if (!da_tokens) { dev_dbg(d, "no token support on this system\n"); return -EINVAL; } /* find the matching token ID */ for (i = 0; i < da_num_tokens; i++) { if (da_tokens[i].location != buffer->input[0]) continue; t = da_tokens[i].tokenID; break; } /* token call; but token didn't exist */ if (!t) { dev_dbg(d, "token at location %04x doesn't exist\n", buffer->input[0]); return -EINVAL; } /* match against token blacklist */ for (i = 0; i < ARRAY_SIZE(token_blacklist); i++) { if (!token_blacklist[i].min || !token_blacklist[i].max) continue; if (t >= token_blacklist[i].min && t <= token_blacklist[i].max) return -EINVAL; } /* match against token whitelist */ for (i = 0; i < ARRAY_SIZE(token_whitelist); i++) { if (!token_whitelist[i].min || !token_whitelist[i].max) continue; if (t < token_whitelist[i].min || t > token_whitelist[i].max) continue; if (!token_whitelist[i].need_capability || capable(token_whitelist[i].need_capability)) { dev_dbg(d, "whitelisted token: %x\n", t); return 0; } } } /* match against call whitelist */ for (i = 0; i < ARRAY_SIZE(call_whitelist); i++) { if (buffer->cmd_class != call_whitelist[i].cmd_class) continue; if (buffer->cmd_select != call_whitelist[i].cmd_select) continue; if (!call_whitelist[i].need_capability || capable(call_whitelist[i].need_capability)) { dev_dbg(d, "whitelisted capable command: %u/%u\n", buffer->cmd_class, buffer->cmd_select); return 0; } dev_dbg(d, "missing capability %d for %u/%u\n", call_whitelist[i].need_capability, buffer->cmd_class, buffer->cmd_select); } /* not in a whitelist, only allow processes with capabilities */ if (capable(CAP_SYS_RAWIO)) { dev_dbg(d, "Allowing %u/%u due to CAP_SYS_RAWIO\n", buffer->cmd_class, buffer->cmd_select); return 0; } return -EACCES; } EXPORT_SYMBOL_GPL(dell_smbios_call_filter); int dell_smbios_call(struct calling_interface_buffer *buffer) { int (*call_fn)(struct calling_interface_buffer *) = NULL; struct device *selected_dev = NULL; struct smbios_device *priv; int ret; mutex_lock(&smbios_mutex); list_for_each_entry(priv, &smbios_device_list, list) { if (!selected_dev || priv->device->id >= selected_dev->id) { dev_dbg(priv->device, "Trying device ID: %d\n", priv->device->id); call_fn = priv->call_fn; selected_dev = priv->device; } } if (!selected_dev) { ret = -ENODEV; pr_err("No dell-smbios drivers are loaded\n"); goto out_smbios_call; } ret = call_fn(buffer); out_smbios_call: mutex_unlock(&smbios_mutex); return ret; } EXPORT_SYMBOL_GPL(dell_smbios_call); struct calling_interface_token *dell_smbios_find_token(int tokenid) { int i; if (!da_tokens) return NULL; for (i = 0; i < da_num_tokens; i++) { if (da_tokens[i].tokenID == tokenid) return &da_tokens[i]; } return NULL; } EXPORT_SYMBOL_GPL(dell_smbios_find_token); static BLOCKING_NOTIFIER_HEAD(dell_laptop_chain_head); int dell_laptop_register_notifier(struct notifier_block *nb) { return blocking_notifier_chain_register(&dell_laptop_chain_head, nb); } EXPORT_SYMBOL_GPL(dell_laptop_register_notifier); int dell_laptop_unregister_notifier(struct notifier_block *nb) { return blocking_notifier_chain_unregister(&dell_laptop_chain_head, nb); } EXPORT_SYMBOL_GPL(dell_laptop_unregister_notifier); void dell_laptop_call_notifier(unsigned long action, void *data) { blocking_notifier_call_chain(&dell_laptop_chain_head, action, data); } EXPORT_SYMBOL_GPL(dell_laptop_call_notifier); static void __init parse_da_table(const struct dmi_header *dm) { /* Final token is a terminator, so we don't want to copy it */ int tokens = (dm->length-11)/sizeof(struct calling_interface_token)-1; struct calling_interface_token *new_da_tokens; struct calling_interface_structure *table = container_of(dm, struct calling_interface_structure, header); /* * 4 bytes of table header, plus 7 bytes of Dell header * plus at least 6 bytes of entry */ if (dm->length < 17) return; da_supported_commands = table->supportedCmds; new_da_tokens = krealloc(da_tokens, (da_num_tokens + tokens) * sizeof(struct calling_interface_token), GFP_KERNEL); if (!new_da_tokens) return; da_tokens = new_da_tokens; memcpy(da_tokens+da_num_tokens, table->tokens, sizeof(struct calling_interface_token) * tokens); da_num_tokens += tokens; } static void zero_duplicates(struct device *dev) { int i, j; for (i = 0; i < da_num_tokens; i++) { if (da_tokens[i].tokenID == 0) continue; for (j = i+1; j < da_num_tokens; j++) { if (da_tokens[j].tokenID == 0) continue; if (da_tokens[i].tokenID == da_tokens[j].tokenID) { dev_dbg(dev, "Zeroing dup token ID %x(%x/%x)\n", da_tokens[j].tokenID, da_tokens[j].location, da_tokens[j].value); da_tokens[j].tokenID = 0; } } } } static void __init find_tokens(const struct dmi_header *dm, void *dummy) { switch (dm->type) { case 0xd4: /* Indexed IO */ case 0xd5: /* Protected Area Type 1 */ case 0xd6: /* Protected Area Type 2 */ break; case 0xda: /* Calling interface */ parse_da_table(dm); break; } } static int match_attribute(struct device *dev, struct device_attribute *attr) { int i; for (i = 0; i < da_num_tokens * 2; i++) { if (!token_attrs[i]) continue; if (strcmp(token_attrs[i]->name, attr->attr.name) == 0) return i/2; } dev_dbg(dev, "couldn't match: %s\n", attr->attr.name); return -EINVAL; } static ssize_t location_show(struct device *dev, struct device_attribute *attr, char *buf) { int i; if (!capable(CAP_SYS_ADMIN)) return -EPERM; i = match_attribute(dev, attr); if (i > 0) return scnprintf(buf, PAGE_SIZE, "%08x", da_tokens[i].location); return 0; } static ssize_t value_show(struct device *dev, struct device_attribute *attr, char *buf) { int i; if (!capable(CAP_SYS_ADMIN)) return -EPERM; i = match_attribute(dev, attr); if (i > 0) return scnprintf(buf, PAGE_SIZE, "%08x", da_tokens[i].value); return 0; } static struct attribute_group smbios_attribute_group = { .name = "tokens" }; static struct platform_driver platform_driver = { .driver = { .name = "dell-smbios", }, }; static int build_tokens_sysfs(struct platform_device *dev) { char *location_name; char *value_name; size_t size; int ret; int i, j; /* (number of tokens + 1 for null terminated */ size = sizeof(struct device_attribute) * (da_num_tokens + 1); token_location_attrs = kzalloc(size, GFP_KERNEL); if (!token_location_attrs) return -ENOMEM; token_value_attrs = kzalloc(size, GFP_KERNEL); if (!token_value_attrs) goto out_allocate_value; /* need to store both location and value + terminator*/ size = sizeof(struct attribute *) * ((2 * da_num_tokens) + 1); token_attrs = kzalloc(size, GFP_KERNEL); if (!token_attrs) goto out_allocate_attrs; for (i = 0, j = 0; i < da_num_tokens; i++) { /* skip empty */ if (da_tokens[i].tokenID == 0) continue; /* add location */ location_name = kasprintf(GFP_KERNEL, "%04x_location", da_tokens[i].tokenID); if (location_name == NULL) goto out_unwind_strings; sysfs_attr_init(&token_location_attrs[i].attr); token_location_attrs[i].attr.name = location_name; token_location_attrs[i].attr.mode = 0444; token_location_attrs[i].show = location_show; token_attrs[j++] = &token_location_attrs[i].attr; /* add value */ value_name = kasprintf(GFP_KERNEL, "%04x_value", da_tokens[i].tokenID); if (value_name == NULL) goto loop_fail_create_value; sysfs_attr_init(&token_value_attrs[i].attr); token_value_attrs[i].attr.name = value_name; token_value_attrs[i].attr.mode = 0444; token_value_attrs[i].show = value_show; token_attrs[j++] = &token_value_attrs[i].attr; continue; loop_fail_create_value: kfree(location_name); goto out_unwind_strings; } smbios_attribute_group.attrs = token_attrs; ret = sysfs_create_group(&dev->dev.kobj, &smbios_attribute_group); if (ret) goto out_unwind_strings; return 0; out_unwind_strings: while (i--) { kfree(token_location_attrs[i].attr.name); kfree(token_value_attrs[i].attr.name); } kfree(token_attrs); out_allocate_attrs: kfree(token_value_attrs); out_allocate_value: kfree(token_location_attrs); return -ENOMEM; } static void free_group(struct platform_device *pdev) { int i; sysfs_remove_group(&pdev->dev.kobj, &smbios_attribute_group); for (i = 0; i < da_num_tokens; i++) { kfree(token_location_attrs[i].attr.name); kfree(token_value_attrs[i].attr.name); } kfree(token_attrs); kfree(token_value_attrs); kfree(token_location_attrs); } static int __init dell_smbios_init(void) { int ret, wmi, smm; if (!dmi_find_device(DMI_DEV_TYPE_OEM_STRING, "Dell System", NULL) && !dmi_find_device(DMI_DEV_TYPE_OEM_STRING, "www.dell.com", NULL)) { pr_err("Unable to run on non-Dell system\n"); return -ENODEV; } dmi_walk(find_tokens, NULL); ret = platform_driver_register(&platform_driver); if (ret) goto fail_platform_driver; platform_device = platform_device_alloc("dell-smbios", 0); if (!platform_device) { ret = -ENOMEM; goto fail_platform_device_alloc; } ret = platform_device_add(platform_device); if (ret) goto fail_platform_device_add; /* register backends */ wmi = init_dell_smbios_wmi(); if (wmi) pr_debug("Failed to initialize WMI backend: %d\n", wmi); smm = init_dell_smbios_smm(); if (smm) pr_debug("Failed to initialize SMM backend: %d\n", smm); if (wmi && smm) { pr_err("No SMBIOS backends available (wmi: %d, smm: %d)\n", wmi, smm); goto fail_create_group; } if (da_tokens) { /* duplicate tokens will cause problems building sysfs files */ zero_duplicates(&platform_device->dev); ret = build_tokens_sysfs(platform_device); if (ret) goto fail_sysfs; } return 0; fail_sysfs: free_group(platform_device); fail_create_group: platform_device_del(platform_device); fail_platform_device_add: platform_device_put(platform_device); fail_platform_device_alloc: platform_driver_unregister(&platform_driver); fail_platform_driver: kfree(da_tokens); return ret; } static void __exit dell_smbios_exit(void) { exit_dell_smbios_wmi(); exit_dell_smbios_smm(); mutex_lock(&smbios_mutex); if (platform_device) { if (da_tokens) free_group(platform_device); platform_device_unregister(platform_device); platform_driver_unregister(&platform_driver); } kfree(da_tokens); mutex_unlock(&smbios_mutex); } module_init(dell_smbios_init); module_exit(dell_smbios_exit); MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>"); MODULE_AUTHOR("Gabriele Mazzotta <gabriele.mzt@gmail.com>"); MODULE_AUTHOR("Pali Rohár <pali.rohar@gmail.com>"); MODULE_AUTHOR("Mario Limonciello <mario.limonciello@dell.com>"); MODULE_DESCRIPTION("Common functions for kernel modules using Dell SMBIOS"); MODULE_LICENSE("GPL");
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