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Merge branch 'for-5.5/whiskers' into for-linus

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- robustification of tablet mode support in google-whiskers
  driver (Dmitry Torokhov)
This commit is contained in:
Jiri Kosina 2019-11-29 20:39:21 +01:00
commit d8d0470875
1 changed files with 103 additions and 43 deletions
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146
drivers/hid/hid-google-hammer.c
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@ -35,6 +35,7 @@ struct cbas_ec {
struct device *dev; /* The platform device (EC) */
struct input_dev *input;
bool base_present;
bool base_folded;
struct notifier_block notifier;
};
@ -208,7 +209,14 @@ static int __cbas_ec_probe(struct platform_device *pdev)
return error;
}
input_report_switch(input, SW_TABLET_MODE, !cbas_ec.base_present);
if (!cbas_ec.base_present)
cbas_ec.base_folded = false;
dev_dbg(&pdev->dev, "%s: base: %d, folded: %d\n", __func__,
cbas_ec.base_present, cbas_ec.base_folded);
input_report_switch(input, SW_TABLET_MODE,
!cbas_ec.base_present || cbas_ec.base_folded);
cbas_ec_set_input(input);
@ -322,10 +330,9 @@ static int hammer_kbd_brightness_set_blocking(struct led_classdev *cdev,
static int hammer_register_leds(struct hid_device *hdev)
{
struct hammer_kbd_leds *kbd_backlight;
int error;
kbd_backlight = devm_kzalloc(&hdev->dev,
sizeof(*kbd_backlight),
GFP_KERNEL);
kbd_backlight = kzalloc(sizeof(*kbd_backlight), GFP_KERNEL);
if (!kbd_backlight)
return -ENOMEM;
@ -339,12 +346,31 @@ static int hammer_register_leds(struct hid_device *hdev)
/* Set backlight to 0% initially. */
hammer_kbd_brightness_set_blocking(&kbd_backlight->cdev, 0);
return devm_led_classdev_register(&hdev->dev, &kbd_backlight->cdev);
error = led_classdev_register(&hdev->dev, &kbd_backlight->cdev);
if (error)
goto err_free_mem;
hid_set_drvdata(hdev, kbd_backlight);
return 0;
err_free_mem:
kfree(kbd_backlight);
return error;
}
static void hammer_unregister_leds(struct hid_device *hdev)
{
struct hammer_kbd_leds *kbd_backlight = hid_get_drvdata(hdev);
if (kbd_backlight) {
led_classdev_unregister(&kbd_backlight->cdev);
kfree(kbd_backlight);
}
}
#define HID_UP_GOOGLEVENDOR 0xffd10000
#define HID_VD_KBD_FOLDED 0x00000019
#define WHISKERS_KBD_FOLDED (HID_UP_GOOGLEVENDOR | HID_VD_KBD_FOLDED)
#define HID_USAGE_KBD_FOLDED (HID_UP_GOOGLEVENDOR | HID_VD_KBD_FOLDED)
/* HID usage for keyboard backlight (Alphanumeric display brightness) */
#define HID_AD_BRIGHTNESS 0x00140046
@ -354,8 +380,7 @@ static int hammer_input_mapping(struct hid_device *hdev, struct hid_input *hi,
struct hid_usage *usage,
unsigned long **bit, int *max)
{
if (hdev->product == USB_DEVICE_ID_GOOGLE_WHISKERS &&
usage->hid == WHISKERS_KBD_FOLDED) {
if (usage->hid == HID_USAGE_KBD_FOLDED) {
/*
* We do not want to have this usage mapped as it will get
* mixed in with "base attached" signal and delivered over
@ -372,19 +397,19 @@ static int hammer_event(struct hid_device *hid, struct hid_field *field,
{
unsigned long flags;
if (hid->product == USB_DEVICE_ID_GOOGLE_WHISKERS &&
usage->hid == WHISKERS_KBD_FOLDED) {
if (usage->hid == HID_USAGE_KBD_FOLDED) {
spin_lock_irqsave(&cbas_ec_lock, flags);
hid_dbg(hid, "%s: base: %d, folded: %d\n", __func__,
cbas_ec.base_present, value);
/*
* We should not get event if base is detached, but in case
* we happen to service HID and EC notifications out of order
* let's still check the "base present" flag.
* If we are getting events from Whiskers that means that it
* is attached to the lid.
*/
if (cbas_ec.input && cbas_ec.base_present) {
cbas_ec.base_present = true;
cbas_ec.base_folded = value;
hid_dbg(hid, "%s: base: %d, folded: %d\n", __func__,
cbas_ec.base_present, cbas_ec.base_folded);
if (cbas_ec.input) {
input_report_switch(cbas_ec.input,
SW_TABLET_MODE, value);
input_sync(cbas_ec.input);
@ -397,33 +422,22 @@ static int hammer_event(struct hid_device *hid, struct hid_field *field,
return 0;
}
static bool hammer_is_keyboard_interface(struct hid_device *hdev)
static bool hammer_has_usage(struct hid_device *hdev, unsigned int report_type,
unsigned application, unsigned usage)
{
struct hid_report_enum *re = &hdev->report_enum[HID_INPUT_REPORT];
struct hid_report *report;
list_for_each_entry(report, &re->report_list, list)
if (report->application == HID_GD_KEYBOARD)
return true;
return false;
}
static bool hammer_has_backlight_control(struct hid_device *hdev)
{
struct hid_report_enum *re = &hdev->report_enum[HID_OUTPUT_REPORT];
struct hid_report_enum *re = &hdev->report_enum[report_type];
struct hid_report *report;
int i, j;
list_for_each_entry(report, &re->report_list, list) {
if (report->application != HID_GD_KEYBOARD)
if (report->application != application)
continue;
for (i = 0; i < report->maxfield; i++) {
struct hid_field *field = report->field[i];
for (j = 0; j < field->maxusage; j++)
if (field->usage[j].hid == HID_AD_BRIGHTNESS)
if (field->usage[j].hid == usage)
return true;
}
}
@ -431,21 +445,23 @@ static bool hammer_has_backlight_control(struct hid_device *hdev)
return false;
}
static bool hammer_has_folded_event(struct hid_device *hdev)
{
return hammer_has_usage(hdev, HID_INPUT_REPORT,
HID_GD_KEYBOARD, HID_USAGE_KBD_FOLDED);
}
static bool hammer_has_backlight_control(struct hid_device *hdev)
{
return hammer_has_usage(hdev, HID_OUTPUT_REPORT,
HID_GD_KEYBOARD, HID_AD_BRIGHTNESS);
}
static int hammer_probe(struct hid_device *hdev,
const struct hid_device_id *id)
{
int error;
/*
* We always want to poll for, and handle tablet mode events from
* Whiskers, even when nobody has opened the input device. This also
* prevents the hid core from dropping early tablet mode events from
* the device.
*/
if (hdev->product == USB_DEVICE_ID_GOOGLE_WHISKERS &&
hammer_is_keyboard_interface(hdev))
hdev->quirks |= HID_QUIRK_ALWAYS_POLL;
error = hid_parse(hdev);
if (error)
return error;
@ -454,6 +470,19 @@ static int hammer_probe(struct hid_device *hdev,
if (error)
return error;
/*
* We always want to poll for, and handle tablet mode events from
* devices that have folded usage, even when nobody has opened the input
* device. This also prevents the hid core from dropping early tablet
* mode events from the device.
*/
if (hammer_has_folded_event(hdev)) {
hdev->quirks |= HID_QUIRK_ALWAYS_POLL;
error = hid_hw_open(hdev);
if (error)
return error;
}
if (hammer_has_backlight_control(hdev)) {
error = hammer_register_leds(hdev);
if (error)
@ -465,6 +494,36 @@ static int hammer_probe(struct hid_device *hdev,
return 0;
}
static void hammer_remove(struct hid_device *hdev)
{
unsigned long flags;
if (hammer_has_folded_event(hdev)) {
hid_hw_close(hdev);
/*
* If we are disconnecting then most likely Whiskers is
* being removed. Even if it is not removed, without proper
* keyboard we should not stay in clamshell mode.
*
* The reason for doing it here and not waiting for signal
* from EC, is that on some devices there are high leakage
* on Whiskers pins and we do not detect disconnect reliably,
* resulting in devices being stuck in clamshell mode.
*/
spin_lock_irqsave(&cbas_ec_lock, flags);
if (cbas_ec.input && cbas_ec.base_present) {
input_report_switch(cbas_ec.input, SW_TABLET_MODE, 1);
input_sync(cbas_ec.input);
}
cbas_ec.base_present = false;
spin_unlock_irqrestore(&cbas_ec_lock, flags);
}
hammer_unregister_leds(hdev);
hid_hw_stop(hdev);
}
static const struct hid_device_id hammer_devices[] = {
{ HID_DEVICE(BUS_USB, HID_GROUP_GENERIC,
@ -487,6 +546,7 @@ static struct hid_driver hammer_driver = {
.name = "hammer",
.id_table = hammer_devices,
.probe = hammer_probe,
.remove = hammer_remove,
.input_mapping = hammer_input_mapping,
.event = hammer_event,
};