hollalinux
/
linux-sg2042
mirror of https://github.com/sophgo/linux-riscv.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

HID: sony: Report DS4 motion sensors through a separate device 

The DS4 motion sensors are currently mapped by the hid-core driver
to non-existing axes in between ABS_MISC and ABS_MT_SLOT, because
the device already exhausted ABS_X-ABS_RZ. For a part the mapping
by hid-core is accomplished by a fixup in hid-sony as the motion
axes actually use vendor specific usage pages.

This patch makes the DS4 use a separate input device for the motion
sensors and reports acceleration data through ABS_X-ABS_Z and
gyroscope data through ABS_RX-ABS_RZ. In addition it extends the
event spec to allow gyroscope data through ABS_RX-ABS_RZ when
INPUT_PROP_ACCELEROMETER is set. This change was suggested by
Peter Hutterer during a discussion on linux-input.

[jkosina@suse.cz: rebase onto slightly newer codebase]
Signed-off-by: Roderick Colenbrander <roderick.colenbrander@sony.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Roderick Colenbrander 2017-03-07 15:45:00 -08:00 committed by Jiri Kosina
parent 765a1077c8
commit 227c011b2e
3 changed files with 117 additions and 296 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
Documentation/input/event-codes.txt
View File

@ -301,7 +301,10 @@ them as any other INPUT_PROP_BUTTONPAD device.
INPUT_PROP_ACCELEROMETER
-------------------------
Directional axes on this device (absolute and/or relative x, y, z) represent
accelerometer data. All other axes retain their meaning. A device must not mix
accelerometer data. Some devices also report gyroscope data, which devices
can report through the rotational axes (absolute and/or relative rx, ry, rz).
All other axes retain their meaning. A device must not mix
regular directional axes and accelerometer axes on the same event node.
Guidelines:

397
drivers/hid/hid-sony.c
View File

@ -344,265 +344,6 @@ static u8 navigation_rdesc[] = {
0xC0 /* End Collection */
};
/*
* The default descriptor doesn't provide mapping for the accelerometers
* or orientation sensors. This fixed descriptor maps the accelerometers
* to usage values 0x40, 0x41 and 0x42 and maps the orientation sensors
* to usage values 0x43, 0x44 and 0x45.
*/
static u8 dualshock4_usb_rdesc[] = {
0x05, 0x01, /* Usage Page (Desktop), */
0x09, 0x05, /* Usage (Gamepad), */
0xA1, 0x01, /* Collection (Application), */
0x85, 0x01, /* Report ID (1), */
0x09, 0x30, /* Usage (X), */
0x09, 0x31, /* Usage (Y), */
0x09, 0x32, /* Usage (Z), */
0x09, 0x35, /* Usage (Rz), */
0x15, 0x00, /* Logical Minimum (0), */
0x26, 0xFF, 0x00, /* Logical Maximum (255), */
0x75, 0x08, /* Report Size (8), */
0x95, 0x04, /* Report Count (4), */
0x81, 0x02, /* Input (Variable), */
0x09, 0x39, /* Usage (Hat Switch), */
0x15, 0x00, /* Logical Minimum (0), */
0x25, 0x07, /* Logical Maximum (7), */
0x35, 0x00, /* Physical Minimum (0), */
0x46, 0x3B, 0x01, /* Physical Maximum (315), */
0x65, 0x14, /* Unit (Degrees), */
0x75, 0x04, /* Report Size (4), */
0x95, 0x01, /* Report Count (1), */
0x81, 0x42, /* Input (Variable, Null State), */
0x65, 0x00, /* Unit, */
0x05, 0x09, /* Usage Page (Button), */
0x19, 0x01, /* Usage Minimum (01h), */
0x29, 0x0D, /* Usage Maximum (0Dh), */
0x15, 0x00, /* Logical Minimum (0), */
0x25, 0x01, /* Logical Maximum (1), */
0x75, 0x01, /* Report Size (1), */
0x95, 0x0E, /* Report Count (14), */
0x81, 0x02, /* Input (Variable), */
0x06, 0x00, 0xFF, /* Usage Page (FF00h), */
0x09, 0x20, /* Usage (20h), */
0x75, 0x06, /* Report Size (6), */
0x95, 0x01, /* Report Count (1), */
0x15, 0x00, /* Logical Minimum (0), */
0x25, 0x3F, /* Logical Maximum (63), */
0x81, 0x02, /* Input (Variable), */
0x05, 0x01, /* Usage Page (Desktop), */
0x09, 0x33, /* Usage (Rx), */
0x09, 0x34, /* Usage (Ry), */
0x15, 0x00, /* Logical Minimum (0), */
0x26, 0xFF, 0x00, /* Logical Maximum (255), */
0x75, 0x08, /* Report Size (8), */
0x95, 0x02, /* Report Count (2), */
0x81, 0x02, /* Input (Variable), */
0x06, 0x00, 0xFF, /* Usage Page (FF00h), */
0x09, 0x21, /* Usage (21h), */
0x95, 0x03, /* Report Count (3), */
0x81, 0x02, /* Input (Variable), */
0x05, 0x01, /* Usage Page (Desktop), */
0x19, 0x40, /* Usage Minimum (40h), */
0x29, 0x42, /* Usage Maximum (42h), */
0x16, 0x00, 0x80, /* Logical Minimum (-32768), */
0x26, 0xFF, 0x7F, /* Logical Maximum (32767), */
0x75, 0x10, /* Report Size (16), */
0x95, 0x03, /* Report Count (3), */
0x81, 0x02, /* Input (Variable), */
0x19, 0x43, /* Usage Minimum (43h), */
0x29, 0x45, /* Usage Maximum (45h), */
0x16, 0x00, 0x80, /* Logical Minimum (-32768), */
0x26, 0xFF, 0x7F, /* Logical Maximum (32767), */
0x95, 0x03, /* Report Count (3), */
0x81, 0x02, /* Input (Variable), */
0x06, 0x00, 0xFF, /* Usage Page (FF00h), */
0x09, 0x21, /* Usage (21h), */
0x15, 0x00, /* Logical Minimum (0), */
0x26, 0xFF, 0x00, /* Logical Maximum (255), */
0x75, 0x08, /* Report Size (8), */
0x95, 0x27, /* Report Count (39), */
0x81, 0x02, /* Input (Variable), */
0x85, 0x05, /* Report ID (5), */
0x09, 0x22, /* Usage (22h), */
0x95, 0x1F, /* Report Count (31), */
0x91, 0x02, /* Output (Variable), */
0x85, 0x04, /* Report ID (4), */
0x09, 0x23, /* Usage (23h), */
0x95, 0x24, /* Report Count (36), */
0xB1, 0x02, /* Feature (Variable), */
0x85, 0x02, /* Report ID (2), */
0x09, 0x24, /* Usage (24h), */
0x95, 0x24, /* Report Count (36), */
0xB1, 0x02, /* Feature (Variable), */
0x85, 0x08, /* Report ID (8), */
0x09, 0x25, /* Usage (25h), */
0x95, 0x03, /* Report Count (3), */
0xB1, 0x02, /* Feature (Variable), */
0x85, 0x10, /* Report ID (16), */
0x09, 0x26, /* Usage (26h), */
0x95, 0x04, /* Report Count (4), */
0xB1, 0x02, /* Feature (Variable), */
0x85, 0x11, /* Report ID (17), */
0x09, 0x27, /* Usage (27h), */
0x95, 0x02, /* Report Count (2), */
0xB1, 0x02, /* Feature (Variable), */
0x85, 0x12, /* Report ID (18), */
0x06, 0x02, 0xFF, /* Usage Page (FF02h), */
0x09, 0x21, /* Usage (21h), */
0x95, 0x0F, /* Report Count (15), */
0xB1, 0x02, /* Feature (Variable), */
0x85, 0x13, /* Report ID (19), */
0x09, 0x22, /* Usage (22h), */
0x95, 0x16, /* Report Count (22), */
0xB1, 0x02, /* Feature (Variable), */
0x85, 0x14, /* Report ID (20), */
0x06, 0x05, 0xFF, /* Usage Page (FF05h), */
0x09, 0x20, /* Usage (20h), */
0x95, 0x10, /* Report Count (16), */
0xB1, 0x02, /* Feature (Variable), */
0x85, 0x15, /* Report ID (21), */
0x09, 0x21, /* Usage (21h), */
0x95, 0x2C, /* Report Count (44), */
0xB1, 0x02, /* Feature (Variable), */
0x06, 0x80, 0xFF, /* Usage Page (FF80h), */
0x85, 0x80, /* Report ID (128), */
0x09, 0x20, /* Usage (20h), */
0x95, 0x06, /* Report Count (6), */
0xB1, 0x02, /* Feature (Variable), */
0x85, 0x81, /* Report ID (129), */
0x09, 0x21, /* Usage (21h), */
0x95, 0x06, /* Report Count (6), */
0xB1, 0x02, /* Feature (Variable), */
0x85, 0x82, /* Report ID (130), */
0x09, 0x22, /* Usage (22h), */
0x95, 0x05, /* Report Count (5), */
0xB1, 0x02, /* Feature (Variable), */
0x85, 0x83, /* Report ID (131), */
0x09, 0x23, /* Usage (23h), */
0x95, 0x01, /* Report Count (1), */
0xB1, 0x02, /* Feature (Variable), */
0x85, 0x84, /* Report ID (132), */
0x09, 0x24, /* Usage (24h), */
0x95, 0x04, /* Report Count (4), */
0xB1, 0x02, /* Feature (Variable), */
0x85, 0x85, /* Report ID (133), */
0x09, 0x25, /* Usage (25h), */
0x95, 0x06, /* Report Count (6), */
0xB1, 0x02, /* Feature (Variable), */
0x85, 0x86, /* Report ID (134), */
0x09, 0x26, /* Usage (26h), */
0x95, 0x06, /* Report Count (6), */
0xB1, 0x02, /* Feature (Variable), */
0x85, 0x87, /* Report ID (135), */
0x09, 0x27, /* Usage (27h), */
0x95, 0x23, /* Report Count (35), */
0xB1, 0x02, /* Feature (Variable), */
0x85, 0x88, /* Report ID (136), */
0x09, 0x28, /* Usage (28h), */
0x95, 0x22, /* Report Count (34), */
0xB1, 0x02, /* Feature (Variable), */
0x85, 0x89, /* Report ID (137), */
0x09, 0x29, /* Usage (29h), */
0x95, 0x02, /* Report Count (2), */
0xB1, 0x02, /* Feature (Variable), */
0x85, 0x90, /* Report ID (144), */
0x09, 0x30, /* Usage (30h), */
0x95, 0x05, /* Report Count (5), */
0xB1, 0x02, /* Feature (Variable), */
0x85, 0x91, /* Report ID (145), */
0x09, 0x31, /* Usage (31h), */
0x95, 0x03, /* Report Count (3), */
0xB1, 0x02, /* Feature (Variable), */
0x85, 0x92, /* Report ID (146), */
0x09, 0x32, /* Usage (32h), */
0x95, 0x03, /* Report Count (3), */
0xB1, 0x02, /* Feature (Variable), */
0x85, 0x93, /* Report ID (147), */
0x09, 0x33, /* Usage (33h), */
0x95, 0x0C, /* Report Count (12), */
0xB1, 0x02, /* Feature (Variable), */
0x85, 0xA0, /* Report ID (160), */
0x09, 0x40, /* Usage (40h), */
0x95, 0x06, /* Report Count (6), */
0xB1, 0x02, /* Feature (Variable), */
0x85, 0xA1, /* Report ID (161), */
0x09, 0x41, /* Usage (41h), */
0x95, 0x01, /* Report Count (1), */
0xB1, 0x02, /* Feature (Variable), */
0x85, 0xA2, /* Report ID (162), */
0x09, 0x42, /* Usage (42h), */
0x95, 0x01, /* Report Count (1), */
0xB1, 0x02, /* Feature (Variable), */
0x85, 0xA3, /* Report ID (163), */
0x09, 0x43, /* Usage (43h), */
0x95, 0x30, /* Report Count (48), */
0xB1, 0x02, /* Feature (Variable), */
0x85, 0xA4, /* Report ID (164), */
0x09, 0x44, /* Usage (44h), */
0x95, 0x0D, /* Report Count (13), */
0xB1, 0x02, /* Feature (Variable), */
0x85, 0xA5, /* Report ID (165), */
0x09, 0x45, /* Usage (45h), */
0x95, 0x15, /* Report Count (21), */
0xB1, 0x02, /* Feature (Variable), */
0x85, 0xA6, /* Report ID (166), */
0x09, 0x46, /* Usage (46h), */
0x95, 0x15, /* Report Count (21), */
0xB1, 0x02, /* Feature (Variable), */
0x85, 0xF0, /* Report ID (240), */
0x09, 0x47, /* Usage (47h), */
0x95, 0x3F, /* Report Count (63), */
0xB1, 0x02, /* Feature (Variable), */
0x85, 0xF1, /* Report ID (241), */
0x09, 0x48, /* Usage (48h), */
0x95, 0x3F, /* Report Count (63), */
0xB1, 0x02, /* Feature (Variable), */
0x85, 0xF2, /* Report ID (242), */
0x09, 0x49, /* Usage (49h), */
0x95, 0x0F, /* Report Count (15), */
0xB1, 0x02, /* Feature (Variable), */
0x85, 0xA7, /* Report ID (167), */
0x09, 0x4A, /* Usage (4Ah), */
0x95, 0x01, /* Report Count (1), */
0xB1, 0x02, /* Feature (Variable), */
0x85, 0xA8, /* Report ID (168), */
0x09, 0x4B, /* Usage (4Bh), */
0x95, 0x01, /* Report Count (1), */
0xB1, 0x02, /* Feature (Variable), */
0x85, 0xA9, /* Report ID (169), */
0x09, 0x4C, /* Usage (4Ch), */
0x95, 0x08, /* Report Count (8), */
0xB1, 0x02, /* Feature (Variable), */
0x85, 0xAA, /* Report ID (170), */
0x09, 0x4E, /* Usage (4Eh), */
0x95, 0x01, /* Report Count (1), */
0xB1, 0x02, /* Feature (Variable), */
0x85, 0xAB, /* Report ID (171), */
0x09, 0x4F, /* Usage (4Fh), */
0x95, 0x39, /* Report Count (57), */
0xB1, 0x02, /* Feature (Variable), */
0x85, 0xAC, /* Report ID (172), */
0x09, 0x50, /* Usage (50h), */
0x95, 0x39, /* Report Count (57), */
0xB1, 0x02, /* Feature (Variable), */
0x85, 0xAD, /* Report ID (173), */
0x09, 0x51, /* Usage (51h), */
0x95, 0x0B, /* Report Count (11), */
0xB1, 0x02, /* Feature (Variable), */
0x85, 0xAE, /* Report ID (174), */
0x09, 0x52, /* Usage (52h), */
0x95, 0x01, /* Report Count (1), */
0xB1, 0x02, /* Feature (Variable), */
0x85, 0xAF, /* Report ID (175), */
0x09, 0x53, /* Usage (53h), */
0x95, 0x02, /* Report Count (2), */
0xB1, 0x02, /* Feature (Variable), */
0x85, 0xB0, /* Report ID (176), */
0x09, 0x54, /* Usage (54h), */
0x95, 0x3F, /* Report Count (63), */
0xB1, 0x02, /* Feature (Variable), */
0xC0 /* End Collection */
};
/*
* The default behavior of the Dualshock 4 is to send reports using report
@ -706,31 +447,10 @@ static u8 dualshock4_bt_rdesc[] = {
0x75, 0x08, /* Report Size (8), */
0x95, 0x02, /* Report Count (2), */
0x81, 0x02, /* Input (Variable), */
0x06, 0x00, 0xFF, /* Usage Page (FF00h), */
0x09, 0x20, /* Usage (20h), */
0x95, 0x03, /* Report Count (3), */
0x81, 0x02, /* Input (Variable), */
0x05, 0x01, /* Usage Page (Desktop), */
0x19, 0x40, /* Usage Minimum (40h), */
0x29, 0x42, /* Usage Maximum (42h), */
0x16, 0x00, 0x80, /* Logical Minimum (-32768), */
0x26, 0xFF, 0x7F, /* Logical Maximum (32767), */
0x75, 0x10, /* Report Size (16), */
0x95, 0x03, /* Report Count (3), */
0x81, 0x02, /* Input (Variable), */
0x19, 0x43, /* Usage Minimum (43h), */
0x29, 0x45, /* Usage Maximum (45h), */
0x16, 0x00, 0x80, /* Logical Minimum (-32768), */
0x26, 0xFF, 0x7F, /* Logical Maximum (32767), */
0x95, 0x03, /* Report Count (3), */
0x81, 0x02, /* Input (Variable), */
0x06, 0x00, 0xFF, /* Usage Page (FF00h), */
0x09, 0x20, /* Usage (20h), */
0x15, 0x00, /* Logical Minimum (0), */
0x26, 0xFF, 0x00, /* Logical Maximum (255), */
0x75, 0x08, /* Report Size (8), */
0x95, 0x31, /* Report Count (51), */
0x81, 0x02, /* Input (Variable), */
0x06, 0x00, 0xFF, /* Usage Page (FF00h) */
0x09, 0x21, /* Usage (0x21) */
0x95, 0x42, /* Report Count (66) */
0x81, 0x02, /* Input (Variable) */
0x09, 0x21, /* Usage (21h), */
0x75, 0x08, /* Report Size (8), */
0x95, 0x4D, /* Report Count (77), */
@ -1060,9 +780,11 @@ struct motion_output_report_02 {
* additional +2.
*/
#define DS4_INPUT_REPORT_BUTTON_OFFSET 5
#define DS4_INPUT_REPORT_GYRO_X_OFFSET 13
#define DS4_INPUT_REPORT_BATTERY_OFFSET 30
#define DS4_INPUT_REPORT_TOUCHPAD_OFFSET 33
#define DS4_SENSOR_SUFFIX " Motion Sensors"
#define DS4_TOUCHPAD_SUFFIX " Touchpad"
static DEFINE_SPINLOCK(sony_dev_list_lock);
@ -1074,6 +796,7 @@ struct sony_sc {
struct list_head list_node;
struct hid_device *hdev;
struct input_dev *touchpad;
struct input_dev *sensor_dev;
struct led_classdev *leds[MAX_LEDS];
unsigned long quirks;
struct work_struct state_worker;
@ -1227,15 +950,11 @@ static u8 *sony_report_fixup(struct hid_device *hdev, u8 *rdesc,
}
/*
* The default Dualshock 4 USB descriptor doesn't assign
* the gyroscope values to corresponding axes so we need a
* modified one.
* The default Dualshock 4 BT descriptor doesn't describe report ID 17
* which is most often used for input data. Add this mapping, so we
* use the generic hid code for parsing the buttons and axes.
*/
if (sc->quirks & DUALSHOCK4_CONTROLLER_USB) {
hid_info(hdev, "Using modified Dualshock 4 report descriptor with gyroscope axes\n");
rdesc = dualshock4_usb_rdesc;
*rsize = sizeof(dualshock4_usb_rdesc);
} else if (sc->quirks & DUALSHOCK4_CONTROLLER_BT) {
if (sc->quirks & DUALSHOCK4_CONTROLLER_BT) {
hid_info(hdev, "Using modified Dualshock 4 Bluetooth report descriptor\n");
rdesc = dualshock4_bt_rdesc;
*rsize = sizeof(dualshock4_bt_rdesc);
@ -1295,6 +1014,9 @@ static void dualshock4_parse_report(struct sony_sc *sc, u8 *rd, int size)
int n, m, offset, num_touch_data, max_touch_data;
u8 cable_state, battery_capacity, battery_charging;
/* Order of hw axes is gyro first, then accelerometer. */
int axes[6] = {ABS_RX, ABS_RY, ABS_RZ, ABS_X, ABS_Y, ABS_Z};
/* When using Bluetooth the header is 2 bytes longer, so skip these. */
int data_offset = (sc->quirks & DUALSHOCK4_CONTROLLER_USB) ? 0 : 2;
@ -1302,6 +1024,14 @@ static void dualshock4_parse_report(struct sony_sc *sc, u8 *rd, int size)
offset = data_offset + DS4_INPUT_REPORT_BUTTON_OFFSET;
input_report_key(sc->touchpad, BTN_LEFT, rd[offset+2] & 0x2);
offset = data_offset + DS4_INPUT_REPORT_GYRO_X_OFFSET;
for (n = 0; n < 6; n++, offset += 2) {
short value = get_unaligned_le16(&rd[offset]);
input_report_abs(sc->sensor_dev, axes[n], value);
}
input_sync(sc->sensor_dev);
/*
* The lower 4 bits of byte 30 (or 32 for BT) contain the battery level
* and the 5th bit contains the USB cable state.
@ -1580,6 +1310,76 @@ static void sony_unregister_touchpad(struct sony_sc *sc)
sc->touchpad = NULL;
}
static int sony_register_sensors(struct sony_sc *sc)
{
size_t name_sz;
char *name;
int ret;
sc->sensor_dev = input_allocate_device();
if (!sc->sensor_dev)
return -ENOMEM;
input_set_drvdata(sc->sensor_dev, sc);
sc->sensor_dev->dev.parent = &sc->hdev->dev;
sc->sensor_dev->phys = sc->hdev->phys;
sc->sensor_dev->uniq = sc->hdev->uniq;
sc->sensor_dev->id.bustype = sc->hdev->bus;
sc->sensor_dev->id.vendor = sc->hdev->vendor;
sc->sensor_dev->id.product = sc->hdev->product;
sc->sensor_dev->id.version = sc->hdev->version;
/* Append a suffix to the controller name as there are various
* DS4 compatible non-Sony devices with different names.
*/
name_sz = strlen(sc->hdev->name) + sizeof(DS4_SENSOR_SUFFIX);
name = kzalloc(name_sz, GFP_KERNEL);
if (!name) {
ret = -ENOMEM;
goto err;
}
snprintf(name, name_sz, "%s" DS4_SENSOR_SUFFIX, sc->hdev->name);
sc->sensor_dev->name = name;
input_set_abs_params(sc->sensor_dev, ABS_X, -32768, 32767, 0, 0);
input_set_abs_params(sc->sensor_dev, ABS_Y, -32768, 32767, 0, 0);
input_set_abs_params(sc->sensor_dev, ABS_Z, -32768, 32767, 0, 0);
input_set_abs_params(sc->sensor_dev, ABS_RX, -32768, 32767, 0, 0);
input_set_abs_params(sc->sensor_dev, ABS_RY, -32768, 32767, 0, 0);
input_set_abs_params(sc->sensor_dev, ABS_RZ, -32768, 32767, 0, 0);
__set_bit(INPUT_PROP_ACCELEROMETER, sc->sensor_dev->propbit);
ret = input_register_device(sc->sensor_dev);
if (ret < 0)
goto err;
return 0;
err:
kfree(sc->sensor_dev->name);
sc->sensor_dev->name = NULL;
input_free_device(sc->sensor_dev);
sc->sensor_dev = NULL;
return ret;
}
static void sony_unregister_sensors(struct sony_sc *sc)
{
if (!sc->sensor_dev)
return;
kfree(sc->sensor_dev->name);
sc->sensor_dev->name = NULL;
input_unregister_device(sc->sensor_dev);
sc->sensor_dev = NULL;
}
/*
* Sending HID_REQ_GET_REPORT changes the operation mode of the ps3 controller
* to "operational". Without this, the ps3 controller will not report any
@ -2585,6 +2385,13 @@ static int sony_input_configured(struct hid_device *hdev,
goto err_stop;
}
ret = sony_register_sensors(sc);
if (ret) {
hid_err(sc->hdev,
"Unable to initialize motion sensors: %d\n", ret);
goto err_stop;
}
sony_init_output_report(sc, dualshock4_send_output_report);
} else if (sc->quirks & MOTION_CONTROLLER) {
sony_init_output_report(sc, motion_send_output_report);
@ -2719,6 +2526,12 @@ static void sony_remove(struct hid_device *hdev)
if (sc->touchpad)
sony_unregister_touchpad(sc);
if (sc->sensor_dev)
sony_unregister_sensors(sc);
if (sc->sensor_dev)
sony_unregister_sensors(sc);
sony_cancel_work_sync(sc);
kfree(sc->output_report_dmabuf);

11
include/uapi/linux/input.h
View File

@ -61,9 +61,14 @@ struct input_id {
* Note that input core does not clamp reported values to the
* [minimum, maximum] limits, such task is left to userspace.
*
* Resolution for main axes (ABS_X, ABS_Y, ABS_Z) is reported in
* units per millimeter (units/mm), resolution for rotational axes
* (ABS_RX, ABS_RY, ABS_RZ) is reported in units per radian.
* The default resolution for main axes (ABS_X, ABS_Y, ABS_Z)
* is reported in units per millimeter (units/mm), resolution
* for rotational axes (ABS_RX, ABS_RY, ABS_RZ) is reported
* in units per radian.
* When INPUT_PROP_ACCELEROMETER is set the resolution changes.
* The main axes (ABS_X, ABS_Y, ABS_Z) are then reported in
* in units per g (units/g) and in units per degree per second
* (units/deg/s) for rotational axes (ABS_RX, ABS_RY, ABS_RZ).
*/
struct input_absinfo {
__s32 value;