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authorJiri Kosina <jkosina@suse.cz>2019-11-29 22:39:21 +0300
committerJiri Kosina <jkosina@suse.cz>2019-11-29 22:39:21 +0300
commitd8d0470875aad437053b6743ef24eb9bd72d9789 (patch)
tree61e5c0409d95c9d6fb3bc08241040c1c7e390ad6 /drivers/hid
parenta820e450390a5a0a9a2174e79326318f4703668b (diff)
parent20c55f250618d4d110b27410a8ffd2c02a0e6911 (diff)
downloadlinux-d8d0470875aad437053b6743ef24eb9bd72d9789.tar.xz
Merge branch 'for-5.5/whiskers' into for-linus
- robustification of tablet mode support in google-whiskers driver (Dmitry Torokhov)
Diffstat (limited to 'drivers/hid')
-rw-r--r--drivers/hid/hid-google-hammer.c146
1 files changed, 103 insertions, 43 deletions
diff --git a/drivers/hid/hid-google-hammer.c b/drivers/hid/hid-google-hammer.c
index d86a9189e88f..2aa4ed157aec 100644
--- a/drivers/hid/hid-google-hammer.c
+++ b/drivers/hid/hid-google-hammer.c
@@ -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,
};