diff options
Diffstat (limited to 'drivers/platform/x86/dell-wmi.c')
-rw-r--r-- | drivers/platform/x86/dell-wmi.c | 238 |
1 files changed, 202 insertions, 36 deletions
diff --git a/drivers/platform/x86/dell-wmi.c b/drivers/platform/x86/dell-wmi.c index 368e193c2741..15c6f1191aec 100644 --- a/drivers/platform/x86/dell-wmi.c +++ b/drivers/platform/x86/dell-wmi.c @@ -37,6 +37,7 @@ #include <linux/string.h> #include <linux/dmi.h> #include <acpi/video.h> +#include "dell-smbios.h" MODULE_AUTHOR("Matthew Garrett <mjg@redhat.com>"); MODULE_AUTHOR("Pali Rohár <pali.rohar@gmail.com>"); @@ -47,10 +48,37 @@ MODULE_LICENSE("GPL"); #define DELL_DESCRIPTOR_GUID "8D9DDCBC-A997-11DA-B012-B622A1EF5492" static u32 dell_wmi_interface_version; +static bool wmi_requires_smbios_request; MODULE_ALIAS("wmi:"DELL_EVENT_GUID); MODULE_ALIAS("wmi:"DELL_DESCRIPTOR_GUID); +static int __init dmi_matched(const struct dmi_system_id *dmi) +{ + wmi_requires_smbios_request = 1; + return 1; +} + +static const struct dmi_system_id dell_wmi_smbios_list[] __initconst = { + { + .callback = dmi_matched, + .ident = "Dell Inspiron M5110", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), + DMI_MATCH(DMI_PRODUCT_NAME, "Inspiron M5110"), + }, + }, + { + .callback = dmi_matched, + .ident = "Dell Vostro V131", + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Dell Inc."), + DMI_MATCH(DMI_PRODUCT_NAME, "Vostro V131"), + }, + }, + { } +}; + /* * Certain keys are flagged as KE_IGNORE. All of these are either * notifications (rather than requests for change) or are also sent @@ -90,8 +118,11 @@ static const struct key_entry dell_wmi_legacy_keymap[] __initconst = { { KE_IGNORE, 0xe020, { KEY_MUTE } }, - /* Shortcut and audio panel keys */ - { KE_IGNORE, 0xe025, { KEY_RESERVED } }, + /* Dell Instant Launch key */ + { KE_KEY, 0xe025, { KEY_PROG4 } }, + { KE_KEY, 0xe029, { KEY_PROG4 } }, + + /* Audio panel key */ { KE_IGNORE, 0xe026, { KEY_RESERVED } }, { KE_IGNORE, 0xe02e, { KEY_VOLUMEDOWN } }, @@ -120,7 +151,10 @@ struct dell_bios_hotkey_table { }; -static const struct dell_bios_hotkey_table *dell_bios_hotkey_table; +struct dell_dmi_results { + int err; + struct key_entry *keymap; +}; /* Uninitialized entries here are KEY_RESERVED == 0. */ static const u16 bios_to_linux_keycode[256] __initconst = { @@ -166,6 +200,30 @@ static const u16 bios_to_linux_keycode[256] __initconst = { [255] = KEY_PROG3, }; +/* + * These are applied if the 0xB2 DMI hotkey table is present and doesn't + * override them. + */ +static const struct key_entry dell_wmi_extra_keymap[] __initconst = { + /* Fn-lock */ + { KE_IGNORE, 0x151, { KEY_RESERVED } }, + + /* Change keyboard illumination */ + { KE_IGNORE, 0x152, { KEY_KBDILLUMTOGGLE } }, + + /* + * Radio disable (notify only -- there is no model for which the + * WMI event is supposed to trigger an action). + */ + { KE_IGNORE, 0x153, { KEY_RFKILL } }, + + /* RGB keyboard backlight control */ + { KE_IGNORE, 0x154, { KEY_RESERVED } }, + + /* Stealth mode toggle */ + { KE_IGNORE, 0x155, { KEY_RESERVED } }, +}; + static struct input_dev *dell_wmi_input_dev; static void dell_wmi_process_key(int reported_key) @@ -188,6 +246,9 @@ static void dell_wmi_process_key(int reported_key) acpi_video_handles_brightness_key_presses()) return; + if (reported_key == 0xe025 && !wmi_requires_smbios_request) + return; + sparse_keymap_report_entry(dell_wmi_input_dev, key, 1, true); } @@ -337,20 +398,60 @@ static void dell_wmi_notify(u32 value, void *context) kfree(obj); } -static const struct key_entry * __init dell_wmi_prepare_new_keymap(void) +static bool have_scancode(u32 scancode, const struct key_entry *keymap, int len) { - int hotkey_num = (dell_bios_hotkey_table->header.length - 4) / - sizeof(struct dell_bios_keymap_entry); - struct key_entry *keymap; int i; - keymap = kcalloc(hotkey_num + 1, sizeof(struct key_entry), GFP_KERNEL); - if (!keymap) - return NULL; + for (i = 0; i < len; i++) + if (keymap[i].code == scancode) + return true; + + return false; +} + +static void __init handle_dmi_entry(const struct dmi_header *dm, + + void *opaque) + +{ + struct dell_dmi_results *results = opaque; + struct dell_bios_hotkey_table *table; + int hotkey_num, i, pos = 0; + struct key_entry *keymap; + int num_bios_keys; + + if (results->err || results->keymap) + return; /* We already found the hotkey table. */ + + if (dm->type != 0xb2) + return; + + table = container_of(dm, struct dell_bios_hotkey_table, header); + + hotkey_num = (table->header.length - + sizeof(struct dell_bios_hotkey_table)) / + sizeof(struct dell_bios_keymap_entry); + if (hotkey_num < 1) { + /* + * Historically, dell-wmi would ignore a DMI entry of + * fewer than 7 bytes. Sizes between 4 and 8 bytes are + * nonsensical (both the header and all entries are 4 + * bytes), so we approximate the old behavior by + * ignoring tables with fewer than one entry. + */ + return; + } + + keymap = kcalloc(hotkey_num + ARRAY_SIZE(dell_wmi_extra_keymap) + 1, + sizeof(struct key_entry), GFP_KERNEL); + if (!keymap) { + results->err = -ENOMEM; + return; + } for (i = 0; i < hotkey_num; i++) { const struct dell_bios_keymap_entry *bios_entry = - &dell_bios_hotkey_table->keymap[i]; + &table->keymap[i]; /* Uninitialized entries are 0 aka KEY_RESERVED. */ u16 keycode = (bios_entry->keycode < @@ -370,20 +471,39 @@ static const struct key_entry * __init dell_wmi_prepare_new_keymap(void) } if (keycode == KEY_KBDILLUMTOGGLE) - keymap[i].type = KE_IGNORE; + keymap[pos].type = KE_IGNORE; else - keymap[i].type = KE_KEY; - keymap[i].code = bios_entry->scancode; - keymap[i].keycode = keycode; + keymap[pos].type = KE_KEY; + keymap[pos].code = bios_entry->scancode; + keymap[pos].keycode = keycode; + + pos++; + } + + num_bios_keys = pos; + + for (i = 0; i < ARRAY_SIZE(dell_wmi_extra_keymap); i++) { + const struct key_entry *entry = &dell_wmi_extra_keymap[i]; + + /* + * Check if we've already found this scancode. This takes + * quadratic time, but it doesn't matter unless the list + * of extra keys gets very long. + */ + if (!have_scancode(entry->code, keymap, num_bios_keys)) { + keymap[pos] = *entry; + pos++; + } } - keymap[hotkey_num].type = KE_END; + keymap[pos].type = KE_END; - return keymap; + results->keymap = keymap; } static int __init dell_wmi_input_setup(void) { + struct dell_dmi_results dmi_results = {}; int err; dell_wmi_input_dev = input_allocate_device(); @@ -394,20 +514,31 @@ static int __init dell_wmi_input_setup(void) dell_wmi_input_dev->phys = "wmi/input0"; dell_wmi_input_dev->id.bustype = BUS_HOST; - if (dell_new_hk_type) { - const struct key_entry *keymap = dell_wmi_prepare_new_keymap(); - if (!keymap) { - err = -ENOMEM; - goto err_free_dev; - } + if (dmi_walk(handle_dmi_entry, &dmi_results)) { + /* + * Historically, dell-wmi ignored dmi_walk errors. A failure + * is certainly surprising, but it probably just indicates + * a very old laptop. + */ + pr_warn("no DMI; using the old-style hotkey interface\n"); + } - err = sparse_keymap_setup(dell_wmi_input_dev, keymap, NULL); + if (dmi_results.err) { + err = dmi_results.err; + goto err_free_dev; + } + + if (dmi_results.keymap) { + dell_new_hk_type = true; + + err = sparse_keymap_setup(dell_wmi_input_dev, + dmi_results.keymap, NULL); /* * Sparse keymap library makes a copy of keymap so we * don't need the original one that was allocated. */ - kfree(keymap); + kfree(dmi_results.keymap); } else { err = sparse_keymap_setup(dell_wmi_input_dev, dell_wmi_legacy_keymap, NULL); @@ -434,15 +565,6 @@ static void dell_wmi_input_destroy(void) input_unregister_device(dell_wmi_input_dev); } -static void __init find_hk_type(const struct dmi_header *dm, void *dummy) -{ - if (dm->type == 0xb2 && dm->length > 6) { - dell_new_hk_type = true; - dell_bios_hotkey_table = - container_of(dm, struct dell_bios_hotkey_table, header); - } -} - /* * Descriptor buffer is 128 byte long and contains: * @@ -509,6 +631,38 @@ static int __init dell_wmi_check_descriptor_buffer(void) return 0; } +/* + * According to Dell SMBIOS documentation: + * + * 17 3 Application Program Registration + * + * cbArg1 Application ID 1 = 0x00010000 + * cbArg2 Application ID 2 + * QUICKSET/DCP = 0x51534554 "QSET" + * ALS Driver = 0x416c7353 "AlsS" + * Latitude ON = 0x4c6f6e52 "LonR" + * cbArg3 Application version or revision number + * cbArg4 0 = Unregister application + * 1 = Register application + * cbRes1 Standard return codes (0, -1, -2) + */ + +static int dell_wmi_events_set_enabled(bool enable) +{ + struct calling_interface_buffer *buffer; + int ret; + + buffer = dell_smbios_get_buffer(); + buffer->input[0] = 0x10000; + buffer->input[1] = 0x51534554; + buffer->input[3] = enable; + dell_smbios_send_request(17, 3); + ret = buffer->output[0]; + dell_smbios_release_buffer(); + + return dell_smbios_error(ret); +} + static int __init dell_wmi_init(void) { int err; @@ -524,8 +678,6 @@ static int __init dell_wmi_init(void) if (err) return err; - dmi_walk(find_hk_type, NULL); - err = dell_wmi_input_setup(); if (err) return err; @@ -538,12 +690,26 @@ static int __init dell_wmi_init(void) return -ENODEV; } + dmi_check_system(dell_wmi_smbios_list); + + if (wmi_requires_smbios_request) { + err = dell_wmi_events_set_enabled(true); + if (err) { + pr_err("Failed to enable WMI events\n"); + wmi_remove_notify_handler(DELL_EVENT_GUID); + dell_wmi_input_destroy(); + return err; + } + } + return 0; } module_init(dell_wmi_init); static void __exit dell_wmi_exit(void) { + if (wmi_requires_smbios_request) + dell_wmi_events_set_enabled(false); wmi_remove_notify_handler(DELL_EVENT_GUID); dell_wmi_input_destroy(); } |