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ACPI: thinkpad-acpi: add tablet-mode reporting 

A quick study of the 0x5009/0x500A HKEY event on the X61t DSDT revealed the
existence of the EC HTAB register (EC 0x0f, bit 7), and a compare with the
X41t DSDT shows that HKEY.MHKG can be used to verify if the ThinkPad is
tablet-capable (MHKG present), and in tablet mode (bit 3 of MHKG return is
set).

Add an attribute to report this information, "hotkey_tablet_mode".  This
attribute has poll()/select() support, and can be used along with EV_SW
SW_TABLET_MODE to hook userspace to tablet events.

Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Signed-off-by: Len Brown <len.brown@intel.com>
hifive-unleashed-5.1
Henrique de Moraes Holschuh 2008-02-16 02:17:58 -02:00 committed by Len Brown
parent d147da73c9
commit 6c231bd5eb
2 changed files with 75 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
Documentation/laptops/thinkpad-acpi.txt
View File

@ -313,6 +313,13 @@ sysfs notes:
This attribute has poll()/select() support.
hotkey_tablet_mode:
If the ThinkPad has tablet capabilities, this attribute
will read 0 if the ThinkPad is in normal mode, and
1 if the ThinkPad is in tablet mode.
This attribute has poll()/select() support.
hotkey_report_mode:
Returns the state of the procfs ACPI event report mode
filter for hot keys. If it is set to 1 (the default),

79
drivers/misc/thinkpad_acpi.c
View File

@ -221,6 +221,7 @@ static struct {
u32 hotkey:1;
u32 hotkey_mask:1;
u32 hotkey_wlsw:1;
u32 hotkey_tablet:1;
u32 light:1;
u32 light_status:1;
u32 bright_16levels:1;
@ -1060,6 +1061,9 @@ static struct attribute_set *hotkey_dev_attributes;
#define HOTKEY_CONFIG_CRITICAL_END
#endif /* CONFIG_THINKPAD_ACPI_HOTKEY_POLL */
/* HKEY.MHKG() return bits */
#define TP_HOTKEY_TABLET_MASK (1 << 3)
static int hotkey_get_wlsw(int *status)
{
if (!acpi_evalf(hkey_handle, status, "WLSW", "d"))
@ -1067,6 +1071,16 @@ static int hotkey_get_wlsw(int *status)
return 0;
}
static int hotkey_get_tablet_mode(int *status)
{
int s;
if (!acpi_evalf(hkey_handle, &s, "MHKG", "d"))
return -EIO;
return ((s & TP_HOTKEY_TABLET_MASK) != 0);
}
/*
* Call with hotkey_mutex held
*/
@ -1172,15 +1186,20 @@ static void tpacpi_input_send_radiosw(void)
}
}
static void tpacpi_input_send_tabletsw(unsigned int state)
static void tpacpi_input_send_tabletsw(void)
{
mutex_lock(&tpacpi_inputdev_send_mutex);
int state;
input_report_switch(tpacpi_inputdev,
SW_TABLET_MODE, !!state);
input_sync(tpacpi_inputdev);
if (tp_features.hotkey_tablet &&
!hotkey_get_tablet_mode(&state)) {
mutex_lock(&tpacpi_inputdev_send_mutex);
mutex_unlock(&tpacpi_inputdev_send_mutex);
input_report_switch(tpacpi_inputdev,
SW_TABLET_MODE, !!state);
input_sync(tpacpi_inputdev);
mutex_unlock(&tpacpi_inputdev_send_mutex);
}
}
static void tpacpi_input_send_key(unsigned int scancode)
@ -1691,6 +1710,29 @@ static void hotkey_radio_sw_notify_change(void)
"hotkey_radio_sw");
}
/* sysfs hotkey tablet mode (pollable) --------------------------------- */
static ssize_t hotkey_tablet_mode_show(struct device *dev,
struct device_attribute *attr,
char *buf)
{
int res, s;
res = hotkey_get_tablet_mode(&s);
if (res < 0)
return res;
return snprintf(buf, PAGE_SIZE, "%d\n", !!s);
}
static struct device_attribute dev_attr_hotkey_tablet_mode =
__ATTR(hotkey_tablet_mode, S_IRUGO, hotkey_tablet_mode_show, NULL);
static void hotkey_tablet_mode_notify_change(void)
{
if (tp_features.hotkey_tablet)
sysfs_notify(&tpacpi_pdev->dev.kobj, NULL,
"hotkey_tablet_mode");
}
/* sysfs hotkey report_mode -------------------------------------------- */
static ssize_t hotkey_report_mode_show(struct device *dev,
struct device_attribute *attr,
@ -1903,7 +1945,7 @@ static int __init hotkey_init(struct ibm_init_struct *iibm)
str_supported(tp_features.hotkey));
if (tp_features.hotkey) {
hotkey_dev_attributes = create_attr_set(12, NULL);
hotkey_dev_attributes = create_attr_set(13, NULL);
if (!hotkey_dev_attributes)
return -ENOMEM;
res = add_many_to_attr_set(hotkey_dev_attributes,
@ -1982,6 +2024,18 @@ static int __init hotkey_init(struct ibm_init_struct *iibm)
&dev_attr_hotkey_radio_sw.attr);
}
/* For X41t, X60t, X61t Tablets... */
if (!res && acpi_evalf(hkey_handle, &status, "MHKG", "qd")) {
tp_features.hotkey_tablet = 1;
printk(TPACPI_INFO
"possible tablet mode switch found; "
"ThinkPad in %s mode\n",
(status & TP_HOTKEY_TABLET_MASK)?
"tablet" : "laptop");
res = add_to_attr_set(hotkey_dev_attributes,
&dev_attr_hotkey_tablet_mode.attr);
}
if (!res)
res = register_attr_set_with_sysfs(
hotkey_dev_attributes,
@ -2031,7 +2085,7 @@ static int __init hotkey_init(struct ibm_init_struct *iibm)
set_bit(EV_SW, tpacpi_inputdev->evbit);
set_bit(SW_RADIO, tpacpi_inputdev->swbit);
}
if (thinkpad_id.vendor == PCI_VENDOR_ID_LENOVO) {
if (tp_features.hotkey_tablet) {
set_bit(EV_SW, tpacpi_inputdev->evbit);
set_bit(SW_TABLET_MODE, tpacpi_inputdev->swbit);
}
@ -2057,6 +2111,7 @@ static int __init hotkey_init(struct ibm_init_struct *iibm)
hotkey_poll_setup_safe(1);
tpacpi_input_send_radiosw();
tpacpi_input_send_tabletsw();
}
return (tp_features.hotkey)? 0 : 1;
@ -2187,9 +2242,10 @@ static void hotkey_notify(struct ibm_struct *ibm, u32 event)
case 0x500b: /* X61t: tablet pen inserted into bay */
case 0x500c: /* X61t: tablet pen removed from bay */
break;
case 0x5009: /* X61t: swivel up (tablet mode) */
case 0x500a: /* X61t: swivel down (normal mode) */
tpacpi_input_send_tabletsw((hkey == 0x5009));
case 0x5009: /* X41t-X61t: swivel up (tablet mode) */
case 0x500a: /* X41t-X61t: swivel down (normal mode) */
tpacpi_input_send_tabletsw();
hotkey_tablet_mode_notify_change();
send_acpi_ev = 0;
break;
case 0x5001:
@ -2250,6 +2306,7 @@ static void hotkey_resume(void)
"from firmware\n");
tpacpi_input_send_radiosw();
hotkey_radio_sw_notify_change();
hotkey_tablet_mode_notify_change();
hotkey_wakeup_reason_notify_change();
hotkey_wakeup_hotunplug_complete_notify_change();
hotkey_poll_setup_safe(0);