]> git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/commitdiff
platform/x86: dell-smbios: Rename dell-smbios source to dell-smbios-base
authorMario Limonciello <mario.limonciello@dell.com>
Tue, 27 Feb 2018 18:23:03 +0000 (12:23 -0600)
committerDarren Hart (VMware) <dvhart@infradead.org>
Fri, 9 Mar 2018 17:35:30 +0000 (09:35 -0800)
This is being done to faciliate a later change to link all the dell-smbios
drivers together.

Signed-off-by: Mario Limonciello <mario.limonciello@dell.com>
Signed-off-by: Darren Hart (VMware) <dvhart@infradead.org>
drivers/platform/x86/Makefile
drivers/platform/x86/dell-smbios-base.c [new file with mode: 0644]
drivers/platform/x86/dell-smbios.c [deleted file]

index c388608ad2a3942ef2c949c87b18f76a33f0c66f..940b1180fbff981840fed1b4c110942cfdb261cf 100644 (file)
@@ -13,6 +13,7 @@ obj-$(CONFIG_MSI_LAPTOP)      += msi-laptop.o
 obj-$(CONFIG_ACPI_CMPC)                += classmate-laptop.o
 obj-$(CONFIG_COMPAL_LAPTOP)    += compal-laptop.o
 obj-$(CONFIG_DELL_SMBIOS)      += dell-smbios.o
+dell-smbios-objs               := dell-smbios-base.o
 obj-$(CONFIG_DELL_SMBIOS_WMI)  += dell-smbios-wmi.o
 obj-$(CONFIG_DELL_SMBIOS_SMM)  += dell-smbios-smm.o
 obj-$(CONFIG_DELL_LAPTOP)      += dell-laptop.o
diff --git a/drivers/platform/x86/dell-smbios-base.c b/drivers/platform/x86/dell-smbios-base.c
new file mode 100644 (file)
index 0000000..76b9d75
--- /dev/null
@@ -0,0 +1,629 @@
+/*
+ *  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) {
+               /* 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;
+
+       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(value_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:
+       for (i = i-1; i > 0; 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)
+{
+       const struct dmi_device *valid;
+       int ret;
+
+       valid = dmi_find_device(DMI_DEV_TYPE_OEM_STRING, "Dell System", NULL);
+       if (!valid) {
+               pr_err("Unable to run on non-Dell system\n");
+               return -ENODEV;
+       }
+
+       dmi_walk(find_tokens, NULL);
+
+       if (!da_tokens)  {
+               pr_info("Unable to find dmi tokens\n");
+               return -ENODEV;
+       }
+
+       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;
+
+       /* duplicate tokens will cause problems building sysfs files */
+       zero_duplicates(&platform_device->dev);
+
+       ret = build_tokens_sysfs(platform_device);
+       if (ret)
+               goto fail_create_group;
+
+       return 0;
+
+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)
+{
+       mutex_lock(&smbios_mutex);
+       if (platform_device) {
+               free_group(platform_device);
+               platform_device_unregister(platform_device);
+               platform_driver_unregister(&platform_driver);
+       }
+       kfree(da_tokens);
+       mutex_unlock(&smbios_mutex);
+}
+
+subsys_initcall(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_DESCRIPTION("Common functions for kernel modules using Dell SMBIOS");
+MODULE_LICENSE("GPL");
diff --git a/drivers/platform/x86/dell-smbios.c b/drivers/platform/x86/dell-smbios.c
deleted file mode 100644 (file)
index 76b9d75..0000000
+++ /dev/null
@@ -1,629 +0,0 @@
-/*
- *  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) {
-               /* 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;
-
-       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(value_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:
-       for (i = i-1; i > 0; 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)
-{
-       const struct dmi_device *valid;
-       int ret;
-
-       valid = dmi_find_device(DMI_DEV_TYPE_OEM_STRING, "Dell System", NULL);
-       if (!valid) {
-               pr_err("Unable to run on non-Dell system\n");
-               return -ENODEV;
-       }
-
-       dmi_walk(find_tokens, NULL);
-
-       if (!da_tokens)  {
-               pr_info("Unable to find dmi tokens\n");
-               return -ENODEV;
-       }
-
-       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;
-
-       /* duplicate tokens will cause problems building sysfs files */
-       zero_duplicates(&platform_device->dev);
-
-       ret = build_tokens_sysfs(platform_device);
-       if (ret)
-               goto fail_create_group;
-
-       return 0;
-
-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)
-{
-       mutex_lock(&smbios_mutex);
-       if (platform_device) {
-               free_group(platform_device);
-               platform_device_unregister(platform_device);
-               platform_driver_unregister(&platform_driver);
-       }
-       kfree(da_tokens);
-       mutex_unlock(&smbios_mutex);
-}
-
-subsys_initcall(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_DESCRIPTION("Common functions for kernel modules using Dell SMBIOS");
-MODULE_LICENSE("GPL");