HID: i2c-hid: add a simple quirk to fix device defects

Certain devices produced by Weida Tech need to have a wakeup command sent to
them before powering on. The call itself will come back with error, but the
device can be powered on afterwards.

[jkosina@suse.cz: rewrite changelog]
[jkosina@suse.cz: remove unused device ID addition]
Signed-off-by: HungNien Chen <hn.chen@weidahitech.com>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

2 files changed, 61 insertions, 0 deletions

diff --git a/drivers/hid/hid-ids.h b/drivers/hid/hid-ids.h
index cd59c79eebdd..c36ec6d01b8b 100644
--- a/drivers/hid/hid-ids.h
+++ b/drivers/hid/hid-ids.h
@@ -1030,6 +1030,10 @@
 #define USB_DEVICE_ID_WALTOP_MEDIA_TABLET_14_1_INCH     0x0500
 #define USB_DEVICE_ID_WALTOP_SIRIUS_BATTERY_FREE_TABLET 0x0502
 
+#define USB_VENDOR_ID_WEIDA             0x2575
+#define USB_DEVICE_ID_WEIDA_8752        0xC300
+#define USB_DEVICE_ID_WEIDA_8755        0xC301
+
 #define USB_VENDOR_ID_WISEGROUP         0x0925
 #define USB_DEVICE_ID_SMARTJOY_PLUS     0x0005
 #define USB_DEVICE_ID_SUPER_JOY_BOX_3   0x8888
diff --git a/drivers/hid/i2c-hid/i2c-hid.c b/drivers/hid/i2c-hid/i2c-hid.c
index fe6b4e0eab4a..ce518795cb30 100644
--- a/drivers/hid/i2c-hid/i2c-hid.c
+++ b/drivers/hid/i2c-hid/i2c-hid.c
@@ -40,6 +40,11 @@
 
 #include <linux/i2c/i2c-hid.h>
 
+#include "../hid-ids.h"
+
+/* quirks to control the device */
+#define I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV        BIT(0)
+
 /* flags */
 #define I2C_HID_STARTED         0
 #define I2C_HID_RESET_PENDING   1
@@ -142,6 +147,7 @@ struct i2c_hid {
         char                    *argsbuf;       /* Command arguments buffer */
 
         unsigned long           flags;          /* device flags */
+        unsigned long           quirks;         /* Various quirks */
 
         wait_queue_head_t       wait;           /* For waiting the interrupt */
 
@@ -151,6 +157,39 @@ struct i2c_hid {
         struct mutex            reset_lock;
 };
 
+static const struct i2c_hid_quirks {
+        __u16 idVendor;
+        __u16 idProduct;
+        __u32 quirks;
+} i2c_hid_quirks[] = {
+        { USB_VENDOR_ID_WEIDA, USB_DEVICE_ID_WEIDA_8752,
+                I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV },
+        { USB_VENDOR_ID_WEIDA, USB_DEVICE_ID_WEIDA_8755,
+                I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV },
+        { 0, 0 }
+};
+
+/*
+ * i2c_hid_lookup_quirk: return any quirks associated with a I2C HID device
+ * @idVendor: the 16-bit vendor ID
+ * @idProduct: the 16-bit product ID
+ *
+ * Returns: a u32 quirks value.
+ */
+static u32 i2c_hid_lookup_quirk(const u16 idVendor, const u16 idProduct)
+{
+        u32 quirks = 0;
+        int n;
+
+        for (n = 0; i2c_hid_quirks[n].idVendor; n++)
+                if (i2c_hid_quirks[n].idVendor == idVendor &&
+                    (i2c_hid_quirks[n].idProduct == (__u16)HID_ANY_ID ||
+                     i2c_hid_quirks[n].idProduct == idProduct))
+                        quirks = i2c_hid_quirks[n].quirks;
+
+        return quirks;
+}
+
 static int __i2c_hid_command(struct i2c_client *client,
                 const struct i2c_hid_cmd *command, u8 reportID,
                 u8 reportType, u8 *args, int args_len,
@@ -343,11 +382,27 @@ static int i2c_hid_set_power(struct i2c_client *client, int power_state)
 
         i2c_hid_dbg(ihid, "%s\n", __func__);
 
+        /*
+         * Some devices require to send a command to wakeup before power on.
+         * The call will get a return value (EREMOTEIO) but device will be
+         * triggered and activated. After that, it goes like a normal device.
+         */
+        if (power_state == I2C_HID_PWR_ON &&
+            ihid->quirks & I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV) {
+                ret = i2c_hid_command(client, &hid_set_power_cmd, NULL, 0);
+
+                /* Device was already activated */
+                if (!ret)
+                        goto set_pwr_exit;
+        }
+
         ret = __i2c_hid_command(client, &hid_set_power_cmd, power_state,
                 0, NULL, 0, NULL, 0);
+
         if (ret)
                 dev_err(&client->dev, "failed to change power setting.\n");
 
+set_pwr_exit:
         return ret;
 }
 
@@ -1032,6 +1087,8 @@ static int i2c_hid_probe(struct i2c_client *client,
                  client->name, hid->vendor, hid->product);
         strlcpy(hid->phys, dev_name(&client->dev), sizeof(hid->phys));
 
+        ihid->quirks = i2c_hid_lookup_quirk(hid->vendor, hid->product);
+
         ret = hid_add_device(hid);
         if (ret) {
                 if (ret != -ENODEV)