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toshiba_acpi: Add full hotkey support
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Calling the ENAB method on Toshiba laptops results in notifications being
sent when laptop hotkeys are pressed.  This patch simply calls that method
and sets up an input device if it's successful.

Signed-off-by: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Len Brown <len.brown@intel.com>
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Matthew Garrett committed Feb 25, 2010
1 parent caeacf5 commit 6335e4d
Showing 1 changed file with 199 additions and 7 deletions.
206 changes: 199 additions & 7 deletions drivers/platform/x86/toshiba_acpi.c
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Original file line number Diff line number Diff line change
Expand Up @@ -46,6 +46,7 @@
#include <linux/backlight.h>
#include <linux/platform_device.h>
#include <linux/rfkill.h>
#include <linux/input.h>

#include <asm/uaccess.h>

Expand All @@ -62,9 +63,10 @@ MODULE_LICENSE("GPL");

/* Toshiba ACPI method paths */
#define METHOD_LCD_BRIGHTNESS "\\_SB_.PCI0.VGA_.LCD_._BCM"
#define METHOD_HCI_1 "\\_SB_.VALD.GHCI"
#define METHOD_HCI_2 "\\_SB_.VALZ.GHCI"
#define TOSH_INTERFACE_1 "\\_SB_.VALD"
#define TOSH_INTERFACE_2 "\\_SB_.VALZ"
#define METHOD_VIDEO_OUT "\\_SB_.VALX.DSSX"
#define GHCI_METHOD ".GHCI"

/* Toshiba HCI interface definitions
*
Expand Down Expand Up @@ -116,6 +118,36 @@ static const struct acpi_device_id toshiba_device_ids[] = {
};
MODULE_DEVICE_TABLE(acpi, toshiba_device_ids);

struct key_entry {
char type;
u16 code;
u16 keycode;
};

enum {KE_KEY, KE_END};

static struct key_entry toshiba_acpi_keymap[] = {
{KE_KEY, 0x101, KEY_MUTE},
{KE_KEY, 0x13b, KEY_COFFEE},
{KE_KEY, 0x13c, KEY_BATTERY},
{KE_KEY, 0x13d, KEY_SLEEP},
{KE_KEY, 0x13e, KEY_SUSPEND},
{KE_KEY, 0x13f, KEY_SWITCHVIDEOMODE},
{KE_KEY, 0x140, KEY_BRIGHTNESSDOWN},
{KE_KEY, 0x141, KEY_BRIGHTNESSUP},
{KE_KEY, 0x142, KEY_WLAN},
{KE_KEY, 0x143, KEY_PROG1},
{KE_KEY, 0xb05, KEY_PROG2},
{KE_KEY, 0xb06, KEY_WWW},
{KE_KEY, 0xb07, KEY_MAIL},
{KE_KEY, 0xb30, KEY_STOP},
{KE_KEY, 0xb31, KEY_PREVIOUSSONG},
{KE_KEY, 0xb32, KEY_NEXTSONG},
{KE_KEY, 0xb33, KEY_PLAYPAUSE},
{KE_KEY, 0xb5a, KEY_MEDIA},
{KE_END, 0, 0},
};

/* utility
*/

Expand Down Expand Up @@ -251,6 +283,8 @@ static acpi_status hci_read2(u32 reg, u32 *out1, u32 *out2, u32 *result)
struct toshiba_acpi_dev {
struct platform_device *p_dev;
struct rfkill *bt_rfk;
struct input_dev *hotkey_dev;
acpi_handle handle;

const char *bt_name;

Expand Down Expand Up @@ -711,8 +745,159 @@ static struct backlight_ops toshiba_backlight_data = {
.update_status = set_lcd_status,
};

static struct key_entry *toshiba_acpi_get_entry_by_scancode(int code)
{
struct key_entry *key;

for (key = toshiba_acpi_keymap; key->type != KE_END; key++)
if (code == key->code)
return key;

return NULL;
}

static struct key_entry *toshiba_acpi_get_entry_by_keycode(int code)
{
struct key_entry *key;

for (key = toshiba_acpi_keymap; key->type != KE_END; key++)
if (code == key->keycode && key->type == KE_KEY)
return key;

return NULL;
}

static int toshiba_acpi_getkeycode(struct input_dev *dev, int scancode,
int *keycode)
{
struct key_entry *key = toshiba_acpi_get_entry_by_scancode(scancode);

if (key && key->type == KE_KEY) {
*keycode = key->keycode;
return 0;
}

return -EINVAL;
}

static int toshiba_acpi_setkeycode(struct input_dev *dev, int scancode,
int keycode)
{
struct key_entry *key;
int old_keycode;

if (keycode < 0 || keycode > KEY_MAX)
return -EINVAL;

key = toshiba_acpi_get_entry_by_scancode(scancode);
if (key && key->type == KE_KEY) {
old_keycode = key->keycode;
key->keycode = keycode;
set_bit(keycode, dev->keybit);
if (!toshiba_acpi_get_entry_by_keycode(old_keycode))
clear_bit(old_keycode, dev->keybit);
return 0;
}

return -EINVAL;
}

static void toshiba_acpi_notify(acpi_handle handle, u32 event, void *context)
{
u32 hci_result, value;
struct key_entry *key;

if (event != 0x80)
return;
do {
hci_read1(HCI_SYSTEM_EVENT, &value, &hci_result);
if (hci_result == HCI_SUCCESS) {
if (value == 0x100)
continue;
else if (value & 0x80) {
key = toshiba_acpi_get_entry_by_scancode
(value & ~0x80);
if (!key) {
printk(MY_INFO "Unknown key %x\n",
value & ~0x80);
continue;
}
input_report_key(toshiba_acpi.hotkey_dev,
key->keycode, 1);
input_sync(toshiba_acpi.hotkey_dev);
input_report_key(toshiba_acpi.hotkey_dev,
key->keycode, 0);
input_sync(toshiba_acpi.hotkey_dev);
}
} else if (hci_result == HCI_NOT_SUPPORTED) {
/* This is a workaround for an unresolved issue on
* some machines where system events sporadically
* become disabled. */
hci_write1(HCI_SYSTEM_EVENT, 1, &hci_result);
printk(MY_NOTICE "Re-enabled hotkeys\n");
}
} while (hci_result != HCI_EMPTY);
}

static int toshiba_acpi_setup_keyboard(char *device)
{
acpi_status status;
acpi_handle handle;
int result;
const struct key_entry *key;

status = acpi_get_handle(NULL, device, &handle);
if (ACPI_FAILURE(status)) {
printk(MY_INFO "Unable to get notification device\n");
return -ENODEV;
}

toshiba_acpi.handle = handle;

status = acpi_evaluate_object(handle, "ENAB", NULL, NULL);
if (ACPI_FAILURE(status)) {
printk(MY_INFO "Unable to enable hotkeys\n");
return -ENODEV;
}

status = acpi_install_notify_handler(handle, ACPI_DEVICE_NOTIFY,
toshiba_acpi_notify, NULL);
if (ACPI_FAILURE(status)) {
printk(MY_INFO "Unable to install hotkey notification\n");
return -ENODEV;
}

toshiba_acpi.hotkey_dev = input_allocate_device();
if (!toshiba_acpi.hotkey_dev) {
printk(MY_INFO "Unable to register input device\n");
return -ENOMEM;
}

toshiba_acpi.hotkey_dev->name = "Toshiba input device";
toshiba_acpi.hotkey_dev->phys = device;
toshiba_acpi.hotkey_dev->id.bustype = BUS_HOST;
toshiba_acpi.hotkey_dev->getkeycode = toshiba_acpi_getkeycode;
toshiba_acpi.hotkey_dev->setkeycode = toshiba_acpi_setkeycode;

for (key = toshiba_acpi_keymap; key->type != KE_END; key++) {
set_bit(EV_KEY, toshiba_acpi.hotkey_dev->evbit);
set_bit(key->keycode, toshiba_acpi.hotkey_dev->keybit);
}

result = input_register_device(toshiba_acpi.hotkey_dev);
if (result) {
printk(MY_INFO "Unable to register input device\n");
return result;
}

return 0;
}

static void toshiba_acpi_exit(void)
{
if (toshiba_acpi.hotkey_dev)
input_unregister_device(toshiba_acpi.hotkey_dev);

if (toshiba_acpi.bt_rfk) {
rfkill_unregister(toshiba_acpi.bt_rfk);
rfkill_destroy(toshiba_acpi.bt_rfk);
Expand All @@ -726,6 +911,9 @@ static void toshiba_acpi_exit(void)
if (toshiba_proc_dir)
remove_proc_entry(PROC_TOSHIBA, acpi_root_dir);

acpi_remove_notify_handler(toshiba_acpi.handle, ACPI_DEVICE_NOTIFY,
toshiba_acpi_notify);

platform_device_unregister(toshiba_acpi.p_dev);

return;
Expand All @@ -742,11 +930,15 @@ static int __init toshiba_acpi_init(void)
return -ENODEV;

/* simple device detection: look for HCI method */
if (is_valid_acpi_path(METHOD_HCI_1))
method_hci = METHOD_HCI_1;
else if (is_valid_acpi_path(METHOD_HCI_2))
method_hci = METHOD_HCI_2;
else
if (is_valid_acpi_path(TOSH_INTERFACE_1 GHCI_METHOD)) {
method_hci = TOSH_INTERFACE_1 GHCI_METHOD;
if (toshiba_acpi_setup_keyboard(TOSH_INTERFACE_1))
printk(MY_INFO "Unable to activate hotkeys\n");
} else if (is_valid_acpi_path(TOSH_INTERFACE_2 GHCI_METHOD)) {
method_hci = TOSH_INTERFACE_2 GHCI_METHOD;
if (toshiba_acpi_setup_keyboard(TOSH_INTERFACE_2))
printk(MY_INFO "Unable to activate hotkeys\n");
} else
return -ENODEV;

printk(MY_INFO "Toshiba Laptop ACPI Extras version %s\n",
Expand Down

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