HID: Add quirk for incorrect input length on Lenovo Y720

Apply it to the Lenovo Y720 gaming laptop I2C peripheral then.

This fixes dmesg being flooded with errors visible on un-suspend
in Linux Mint 19 Cinnamon.

Example of error log:

<...>
[    4.326588] i2c_hid i2c-ITE33D1:00: i2c_hid_get_input: incomplete report (2/4)
[    4.326845] i2c_hid i2c-ITE33D1:00: i2c_hid_get_input: incomplete report (2/4)
[    4.327095] i2c_hid i2c-ITE33D1:00: i2c_hid_get_input: incomplete report (2/4)
[    4.327341] i2c_hid i2c-ITE33D1:00: i2c_hid_get_input: incomplete report (2/4)
[    4.327609] i2c_hid i2c-ITE33D1:00: i2c_hid_get_input: incomplete report (2/4)
<...>

Example of fixed log (debug on)

<...>
[ 3731.333183] i2c_hid i2c-ITE33D1:00: input: 02 00
[ 3731.333581] i2c_hid i2c-ITE33D1:00: input: 02 00
[ 3731.333842] i2c_hid i2c-ITE33D1:00: input: 02 00
[ 3731.334107] i2c_hid i2c-ITE33D1:00: input: 02 00
[ 3731.334367] i2c_hid i2c-ITE33D1:00: input: 02 00
<...>

[jkosina@suse.cz: rebase onto more recent codebase]
Signed-off-by: Pavel Balan <admin@kryma.net>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h
index 56fef74b9ec0cd6bf61e42bc21e7a9f481050edc..3a400ce603c4f39cd3e21e8210f6f06a7d4366bd 100644 (file)
--- a/drivers/hid/hid-ids.h
+++ b/drivers/hid/hid-ids.h
@@ -631,6 +631,7 @@
 #define USB_VENDOR_ID_ITE               0x048d
 #define USB_DEVICE_ID_ITE_LENOVO_YOGA   0x8386
 #define USB_DEVICE_ID_ITE_LENOVO_YOGA2  0x8350
+#define I2C_DEVICE_ID_ITE_LENOVO_LEGION_Y720   0x837a
 #define USB_DEVICE_ID_ITE_LENOVO_YOGA900       0x8396
 #define USB_DEVICE_ID_ITE8595          0x8595
 

diff --git a/drivers/hid/i2c-hid/i2c-hid-core.c b/drivers/hid/i2c-hid/i2c-hid-core.c
index a358e61fbc8272af922b27f789cc544b0bf56e00..009000c5d55cddfaad101f1b33d5b37497e0f176 100644 (file)
--- a/drivers/hid/i2c-hid/i2c-hid-core.c
+++ b/drivers/hid/i2c-hid/i2c-hid-core.c
@@ -49,6 +49,8 @@
 #define I2C_HID_QUIRK_NO_IRQ_AFTER_RESET       BIT(1)
 #define I2C_HID_QUIRK_BOGUS_IRQ                        BIT(4)
 #define I2C_HID_QUIRK_RESET_ON_RESUME          BIT(5)
+#define I2C_HID_QUIRK_BAD_INPUT_SIZE           BIT(6)
+
 
 /* flags */
 #define I2C_HID_STARTED                0
@@ -175,6 +177,8 @@ static const struct i2c_hid_quirks {
                 I2C_HID_QUIRK_BOGUS_IRQ },
        { USB_VENDOR_ID_ALPS_JP, HID_ANY_ID,
                 I2C_HID_QUIRK_RESET_ON_RESUME },
+       { USB_VENDOR_ID_ITE, I2C_DEVICE_ID_ITE_LENOVO_LEGION_Y720,
+               I2C_HID_QUIRK_BAD_INPUT_SIZE },
        { 0, 0 }
 };
 
@@ -496,9 +500,15 @@ static void i2c_hid_get_input(struct i2c_hid *ihid)
        }
 
        if ((ret_size > size) || (ret_size < 2)) {
-               dev_err(&ihid->client->dev, "%s: incomplete report (%d/%d)\n",
-                       __func__, size, ret_size);
-               return;
+               if (ihid->quirks & I2C_HID_QUIRK_BAD_INPUT_SIZE) {
+                       ihid->inbuf[0] = size & 0xff;
+                       ihid->inbuf[1] = size >> 8;
+                       ret_size = size;
+               } else {
+                       dev_err(&ihid->client->dev, "%s: incomplete report (%d/%d)\n",
+                               __func__, size, ret_size);
+                       return;
+               }
        }
 
        i2c_hid_dbg(ihid, "input: %*ph\n", ret_size, ihid->inbuf);