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Subject[PATCH 3/5] Input: dell-wmi - switch to using sparse keymap library
Date
Instead of implementing its own version of keymap hanlding switch over to
using sparse keymap library.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
---

drivers/platform/x86/Kconfig | 1
drivers/platform/x86/dell-wmi.c | 256 +++++++++++++++------------------------
2 files changed, 97 insertions(+), 160 deletions(-)

diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index a99d226..22cec21 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -92,6 +92,7 @@ config DELL_WMI
tristate "Dell WMI extras"
depends on ACPI_WMI
depends on INPUT
+ select INPUT_SPARSEKMAP
---help---
Say Y here if you want to support WMI-based hotkeys on Dell laptops.

diff --git a/drivers/platform/x86/dell-wmi.c b/drivers/platform/x86/dell-wmi.c
index 08fb70f..77f1d55 100644
--- a/drivers/platform/x86/dell-wmi.c
+++ b/drivers/platform/x86/dell-wmi.c
@@ -29,6 +29,7 @@
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/input.h>
+#include <linux/input/sparse-keymap.h>
#include <acpi/acpi_drivers.h>
#include <linux/acpi.h>
#include <linux/string.h>
@@ -44,78 +45,70 @@ static int acpi_video;

MODULE_ALIAS("wmi:"DELL_EVENT_GUID);

-struct key_entry {
- char type; /* See KE_* below */
- u16 code;
- u16 keycode;
-};
-
-enum { KE_KEY, KE_SW, KE_IGNORE, KE_END };
-
/*
* Certain keys are flagged as KE_IGNORE. All of these are either
* notifications (rather than requests for change) or are also sent
* via the keyboard controller so should not be sent again.
*/

-static struct key_entry dell_legacy_wmi_keymap[] = {
- {KE_KEY, 0xe045, KEY_PROG1},
- {KE_KEY, 0xe009, KEY_EJECTCD},
+static const struct key_entry dell_wmi_legacy_keymap[] __initconst = {
+ { KE_KEY, 0xe045, { KEY_PROG1 } },
+ { KE_KEY, 0xe009, { KEY_EJECTCD } },

/* These also contain the brightness level at offset 6 */
- {KE_KEY, 0xe006, KEY_BRIGHTNESSUP},
- {KE_KEY, 0xe005, KEY_BRIGHTNESSDOWN},
+ { KE_KEY, 0xe006, { KEY_BRIGHTNESSUP } },
+ { KE_KEY, 0xe005, { KEY_BRIGHTNESSDOWN } },

/* Battery health status button */
- {KE_KEY, 0xe007, KEY_BATTERY},
+ { KE_KEY, 0xe007, { KEY_BATTERY } },

/* This is actually for all radios. Although physically a
* switch, the notification does not provide an indication of
* state and so it should be reported as a key */
- {KE_KEY, 0xe008, KEY_WLAN},
+ { KE_KEY, 0xe008, { KEY_WLAN } },

/* The next device is at offset 6, the active devices are at
offset 8 and the attached devices at offset 10 */
- {KE_KEY, 0xe00b, KEY_SWITCHVIDEOMODE},
+ { KE_KEY, 0xe00b, { KEY_SWITCHVIDEOMODE } },

- {KE_IGNORE, 0xe00c, KEY_KBDILLUMTOGGLE},
+ { KE_IGNORE, 0xe00c, { KEY_KBDILLUMTOGGLE } },

/* BIOS error detected */
- {KE_IGNORE, 0xe00d, KEY_RESERVED},
+ { KE_IGNORE, 0xe00d, { KEY_RESERVED } },

/* Wifi Catcher */
- {KE_KEY, 0xe011, KEY_PROG2},
+ { KE_KEY, 0xe011, {KEY_PROG2 } },

/* Ambient light sensor toggle */
- {KE_IGNORE, 0xe013, KEY_RESERVED},
-
- {KE_IGNORE, 0xe020, KEY_MUTE},
- {KE_IGNORE, 0xe02e, KEY_VOLUMEDOWN},
- {KE_IGNORE, 0xe030, KEY_VOLUMEUP},
- {KE_IGNORE, 0xe033, KEY_KBDILLUMUP},
- {KE_IGNORE, 0xe034, KEY_KBDILLUMDOWN},
- {KE_IGNORE, 0xe03a, KEY_CAPSLOCK},
- {KE_IGNORE, 0xe045, KEY_NUMLOCK},
- {KE_IGNORE, 0xe046, KEY_SCROLLLOCK},
- {KE_END, 0}
+ { KE_IGNORE, 0xe013, { KEY_RESERVED } },
+
+ { KE_IGNORE, 0xe020, { KEY_MUTE } },
+ { KE_IGNORE, 0xe02e, { KEY_VOLUMEDOWN } },
+ { KE_IGNORE, 0xe030, { KEY_VOLUMEUP } },
+ { KE_IGNORE, 0xe033, { KEY_KBDILLUMUP } },
+ { KE_IGNORE, 0xe034, { KEY_KBDILLUMDOWN } },
+ { KE_IGNORE, 0xe03a, { KEY_CAPSLOCK } },
+ { KE_IGNORE, 0xe045, { KEY_NUMLOCK } },
+ { KE_IGNORE, 0xe046, { KEY_SCROLLLOCK } },
+ { KE_END, 0 }
};

static bool dell_new_hk_type;

-struct dell_new_keymap_entry {
+struct dell_bios_keymap_entry {
u16 scancode;
u16 keycode;
};

-struct dell_hotkey_table {
+struct dell_bios_hotkey_table {
struct dmi_header header;
- struct dell_new_keymap_entry keymap[];
+ struct dell_bios_keymap_entry keymap[];

};

-static struct key_entry *dell_new_wmi_keymap;
+static const struct dell_bios_hotkey_table *dell_bios_hotkey_table;

-static u16 bios_to_linux_keycode[256] = {
+static const u16 bios_to_linux_keycode[256] __initconst = {

KEY_MEDIA, KEY_NEXTSONG, KEY_PLAYPAUSE, KEY_PREVIOUSSONG,
KEY_STOPCD, KEY_UNKNOWN, KEY_UNKNOWN, KEY_UNKNOWN,
@@ -138,68 +131,11 @@ static u16 bios_to_linux_keycode[256] = {
KEY_PROG3
};

-
-static struct key_entry *dell_wmi_keymap = dell_legacy_wmi_keymap;
-
static struct input_dev *dell_wmi_input_dev;

-static struct key_entry *dell_wmi_get_entry_by_scancode(unsigned int code)
-{
- struct key_entry *key;
-
- for (key = dell_wmi_keymap; key->type != KE_END; key++)
- if (code == key->code)
- return key;
-
- return NULL;
-}
-
-static struct key_entry *dell_wmi_get_entry_by_keycode(unsigned int keycode)
-{
- struct key_entry *key;
-
- for (key = dell_wmi_keymap; key->type != KE_END; key++)
- if (key->type == KE_KEY && keycode == key->keycode)
- return key;
-
- return NULL;
-}
-
-static int dell_wmi_getkeycode(struct input_dev *dev,
- unsigned int scancode, unsigned int *keycode)
-{
- struct key_entry *key = dell_wmi_get_entry_by_scancode(scancode);
-
- if (key && key->type == KE_KEY) {
- *keycode = key->keycode;
- return 0;
- }
-
- return -EINVAL;
-}
-
-static int dell_wmi_setkeycode(struct input_dev *dev,
- unsigned int scancode, unsigned int keycode)
-{
- struct key_entry *key;
- unsigned int old_keycode;
-
- key = dell_wmi_get_entry_by_scancode(scancode);
- if (key && key->type == KE_KEY) {
- old_keycode = key->keycode;
- key->keycode = keycode;
- set_bit(keycode, dev->keybit);
- if (!dell_wmi_get_entry_by_keycode(old_keycode))
- clear_bit(old_keycode, dev->keybit);
- return 0;
- }
- return -EINVAL;
-}
-
static void dell_wmi_notify(u32 value, void *context)
{
struct acpi_buffer response = { ACPI_ALLOCATE_BUFFER, NULL };
- static struct key_entry *key;
union acpi_object *obj;
acpi_status status;

@@ -212,8 +148,10 @@ static void dell_wmi_notify(u32 value, void *context)
obj = (union acpi_object *)response.pointer;

if (obj && obj->type == ACPI_TYPE_BUFFER) {
+ const struct key_entry *key;
int reported_key;
u16 *buffer_entry = (u16 *)obj->buffer.pointer;
+
if (dell_new_hk_type && (buffer_entry[1] != 0x10)) {
printk(KERN_INFO "dell-wmi: Received unknown WMI event"
" (0x%x)\n", buffer_entry[1]);
@@ -226,8 +164,8 @@ static void dell_wmi_notify(u32 value, void *context)
else
reported_key = (int)buffer_entry[1] & 0xffff;

- key = dell_wmi_get_entry_by_scancode(reported_key);
-
+ key = sparse_keymap_entry_from_scancode(dell_wmi_input_dev,
+ reported_key);
if (!key) {
printk(KERN_INFO "dell-wmi: Unknown key %x pressed\n",
reported_key);
@@ -237,92 +175,98 @@ static void dell_wmi_notify(u32 value, void *context)
* come via ACPI */
;
} else {
- input_report_key(dell_wmi_input_dev, key->keycode, 1);
- input_sync(dell_wmi_input_dev);
- input_report_key(dell_wmi_input_dev, key->keycode, 0);
- input_sync(dell_wmi_input_dev);
+ sparse_keymap_report_entry(dell_wmi_input_dev, key,
+ 1, true);
}
}
kfree(obj);
}

-
-static void setup_new_hk_map(const struct dmi_header *dm)
+static const struct key_entry * __init dell_wmi_prepare_new_keymap(void)
{
-
+ int hotkey_num = (dell_bios_hotkey_table->header.length - 4) /
+ sizeof(struct dell_bios_keymap_entry);
+ struct key_entry *keymap;
int i;
- int hotkey_num = (dm->length-4)/sizeof(struct dell_new_keymap_entry);
- struct dell_hotkey_table *table =
- container_of(dm, struct dell_hotkey_table, header);

- dell_new_wmi_keymap = kzalloc((hotkey_num+1) *
- sizeof(struct key_entry), GFP_KERNEL);
+ keymap = kcalloc(hotkey_num + 1, sizeof(struct key_entry), GFP_KERNEL);
+ if (!keymap)
+ return NULL;

for (i = 0; i < hotkey_num; i++) {
- dell_new_wmi_keymap[i].type = KE_KEY;
- dell_new_wmi_keymap[i].code = table->keymap[i].scancode;
- dell_new_wmi_keymap[i].keycode =
- (table->keymap[i].keycode > 255) ? 0 :
- bios_to_linux_keycode[table->keymap[i].keycode];
+ const struct dell_bios_keymap_entry *bios_entry =
+ &dell_bios_hotkey_table->keymap[i];
+ keymap[i].type = KE_KEY;
+ keymap[i].code = bios_entry->scancode;
+ keymap[i].keycode = bios_entry->keycode < 256 ?
+ bios_to_linux_keycode[bios_entry->keycode] :
+ KEY_RESERVED;
}

- dell_new_wmi_keymap[i].type = KE_END;
- dell_new_wmi_keymap[i].code = 0;
- dell_new_wmi_keymap[i].keycode = 0;
-
- dell_wmi_keymap = dell_new_wmi_keymap;
+ keymap[hotkey_num].type = KE_END;

+ return keymap;
}

-
-static void find_hk_type(const struct dmi_header *dm, void *dummy)
-{
-
- if ((dm->type == 0xb2) && (dm->length > 6)) {
- dell_new_hk_type = true;
- setup_new_hk_map(dm);
- }
-
-}
-
-
static int __init dell_wmi_input_setup(void)
{
- struct key_entry *key;
int err;

dell_wmi_input_dev = input_allocate_device();
-
if (!dell_wmi_input_dev)
return -ENOMEM;

dell_wmi_input_dev->name = "Dell WMI hotkeys";
dell_wmi_input_dev->phys = "wmi/input0";
dell_wmi_input_dev->id.bustype = BUS_HOST;
- dell_wmi_input_dev->getkeycode = dell_wmi_getkeycode;
- dell_wmi_input_dev->setkeycode = dell_wmi_setkeycode;
-
- for (key = dell_wmi_keymap; key->type != KE_END; key++) {
- switch (key->type) {
- case KE_KEY:
- set_bit(EV_KEY, dell_wmi_input_dev->evbit);
- set_bit(key->keycode, dell_wmi_input_dev->keybit);
- break;
- case KE_SW:
- set_bit(EV_SW, dell_wmi_input_dev->evbit);
- set_bit(key->keycode, dell_wmi_input_dev->swbit);
- break;
+
+ if (dell_new_hk_type) {
+ const struct key_entry *keymap = dell_wmi_prepare_new_keymap();
+ if (!keymap) {
+ err = -ENOMEM;
+ goto err_free_dev;
}
- }

- err = input_register_device(dell_wmi_input_dev);
+ err = sparse_keymap_setup(dell_wmi_input_dev, keymap, NULL);

- if (err) {
- input_free_device(dell_wmi_input_dev);
- return err;
+ /*
+ * Sparse keymap library makes a copy of keymap so we
+ * don't need the original one that was allocated.
+ */
+ kfree(keymap);
+ } else {
+ err = sparse_keymap_setup(dell_wmi_input_dev,
+ dell_wmi_legacy_keymap, NULL);
}
+ if (err)
+ goto err_free_dev;
+
+ err = input_register_device(dell_wmi_input_dev);
+ if (err)
+ goto err_free_keymap;

return 0;
+
+ err_free_keymap:
+ sparse_keymap_free(dell_wmi_input_dev);
+ err_free_dev:
+ input_free_device(dell_wmi_input_dev);
+ return err;
+}
+
+static void dell_wmi_input_destroy(void)
+{
+ sparse_keymap_free(dell_wmi_input_dev);
+ 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);
+ }
}

static int __init dell_wmi_init(void)
@@ -339,18 +283,13 @@ static int __init dell_wmi_init(void)
acpi_video = acpi_video_backlight_support();

err = dell_wmi_input_setup();
- if (err) {
- if (dell_new_hk_type)
- kfree(dell_wmi_keymap);
+ if (err)
return err;
- }

status = wmi_install_notify_handler(DELL_EVENT_GUID,
dell_wmi_notify, NULL);
if (ACPI_FAILURE(status)) {
- input_unregister_device(dell_wmi_input_dev);
- if (dell_new_hk_type)
- kfree(dell_wmi_keymap);
+ dell_wmi_input_destroy();
printk(KERN_ERR
"dell-wmi: Unable to register notify handler - %d\n",
status);
@@ -359,14 +298,11 @@ static int __init dell_wmi_init(void)

return 0;
}
+module_init(dell_wmi_init);

static void __exit dell_wmi_exit(void)
{
wmi_remove_notify_handler(DELL_EVENT_GUID);
- input_unregister_device(dell_wmi_input_dev);
- if (dell_new_hk_type)
- kfree(dell_wmi_keymap);
+ dell_wmi_input_destroy();
}
-
-module_init(dell_wmi_init);
module_exit(dell_wmi_exit);


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