HID: rmi: Support non rmi devices by passing events to hid-input

Allowing hid-rmi to bind to non rmi devices allows us to support composite USB
devices which contain several HID devices one of which is a HID touchpad.
Since all of the devices have the same VID and PID we can add the device
to the hid_have_special_driver list and have hid-rmi handle all of the devices.
Then hid-rmi's probe can look for the rmi specific HID report IDs and decide if
it should handle the device as a rmi device or simply report that the events
needs additional processing.

Signed-off-by: Andrew Duggan <aduggan@synaptics.com>
Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

1 files changed, 76 insertions, 17 deletions

diff --git a/drivers/hid/hid-rmi.c b/drivers/hid/hid-rmi.c
index b51200fe2f33..018f80f5fec6 100644
--- a/drivers/hid/hid-rmi.c
+++ b/drivers/hid/hid-rmi.c
@@ -33,6 +33,9 @@
 #define RMI_READ_DATA_PENDING           BIT(1)
 #define RMI_STARTED                     BIT(2)
 
+/* device flags */
+#define RMI_DEVICE                      BIT(0)
+
 enum rmi_mode_type {
         RMI_MODE_OFF                    = 0,
         RMI_MODE_ATTN_REPORTS           = 1,
@@ -118,6 +121,8 @@ struct rmi_data {
 
         struct work_struct reset_work;
         struct hid_device *hdev;
+
+        unsigned long device_flags;
 };
 
 #define RMI_PAGE(addr) (((addr) >> 8) & 0xff)
@@ -452,9 +457,23 @@ static int rmi_raw_event(struct hid_device *hdev,
                 return rmi_read_data_event(hdev, data, size);
         case RMI_ATTN_REPORT_ID:
                 return rmi_input_event(hdev, data, size);
-        case RMI_MOUSE_REPORT_ID:
+        default:
+                return 1;
+        }
+
+        return 0;
+}
+
+static int rmi_event(struct hid_device *hdev, struct hid_field *field,
+                        struct hid_usage *usage, __s32 value)
+{
+        struct rmi_data *data = hid_get_drvdata(hdev);
+
+        if ((data->device_flags & RMI_DEVICE) &&
+            (field->application == HID_GD_POINTER ||
+            field->application == HID_GD_MOUSE)) {
                 rmi_schedule_reset(hdev);
-                break;
+                return 1;
         }
 
         return 0;
@@ -856,6 +875,9 @@ static void rmi_input_configured(struct hid_device *hdev, struct hid_input *hi)
         if (ret)
                 return;
 
+        if (!(data->device_flags & RMI_DEVICE))
+                return;
+
         /* Allow incoming hid reports */
         hid_device_io_start(hdev);
 
@@ -914,8 +936,33 @@ static int rmi_input_mapping(struct hid_device *hdev,
                 struct hid_input *hi, struct hid_field *field,
                 struct hid_usage *usage, unsigned long **bit, int *max)
 {
-        /* we want to make HID ignore the advertised HID collection */
-        return -1;
+        struct rmi_data *data = hid_get_drvdata(hdev);
+
+        /*
+         * we want to make HID ignore the advertised HID collection
+         * for RMI deivces
+         */
+        if (data->device_flags & RMI_DEVICE)
+                return -1;
+
+        return 0;
+}
+
+static int rmi_check_valid_report_id(struct hid_device *hdev, unsigned type,
+                unsigned id, struct hid_report **report)
+{
+        int i;
+
+        *report = hdev->report_enum[type].report_id_hash[id];
+        if (*report) {
+                for (i = 0; i < (*report)->maxfield; i++) {
+                        unsigned app = (*report)->field[i]->application;
+                        if ((app & HID_USAGE_PAGE) >= HID_UP_MSVENDOR)
+                                return 1;
+                }
+        }
+
+        return 0;
 }
 
 static int rmi_probe(struct hid_device *hdev, const struct hid_device_id *id)
@@ -925,6 +972,7 @@ static int rmi_probe(struct hid_device *hdev, const struct hid_device_id *id)
         size_t alloc_size;
         struct hid_report *input_report;
         struct hid_report *output_report;
+        struct hid_report *feature_report;
 
         data = devm_kzalloc(&hdev->dev, sizeof(struct rmi_data), GFP_KERNEL);
         if (!data)
@@ -943,27 +991,35 @@ static int rmi_probe(struct hid_device *hdev, const struct hid_device_id *id)
                 return ret;
         }
 
-        input_report = hdev->report_enum[HID_INPUT_REPORT]
-                        .report_id_hash[RMI_ATTN_REPORT_ID];
-        if (!input_report) {
-                hid_err(hdev, "device does not have expected input report\n");
-                ret = -ENODEV;
-                return ret;
+        /*
+         * Check for the RMI specific report ids. If they are misisng
+         * simply return and let the events be processed by hid-input
+         */
+        if (!rmi_check_valid_report_id(hdev, HID_FEATURE_REPORT,
+            RMI_SET_RMI_MODE_REPORT_ID, &feature_report)) {
+                hid_dbg(hdev, "device does not have set mode feature report\n");
+                goto start;
+        }
+
+        if (!rmi_check_valid_report_id(hdev, HID_INPUT_REPORT,
+            RMI_ATTN_REPORT_ID, &input_report)) {
+                hid_dbg(hdev, "device does not have attention input report\n");
+                goto start;
         }
 
         data->input_report_size = (input_report->size >> 3) + 1 /* report id */;
 
-        output_report = hdev->report_enum[HID_OUTPUT_REPORT]
-                        .report_id_hash[RMI_WRITE_REPORT_ID];
-        if (!output_report) {
-                hid_err(hdev, "device does not have expected output report\n");
-                ret = -ENODEV;
-                return ret;
+        if (!rmi_check_valid_report_id(hdev, HID_OUTPUT_REPORT,
+            RMI_WRITE_REPORT_ID, &output_report)) {
+                hid_dbg(hdev,
+                        "device does not have rmi write output report\n");
+                goto start;
         }
 
         data->output_report_size = (output_report->size >> 3)
                                         + 1 /* report id */;
 
+        data->device_flags |= RMI_DEVICE;
         alloc_size = data->output_report_size + data->input_report_size;
 
         data->writeReport = devm_kzalloc(&hdev->dev, alloc_size, GFP_KERNEL);
@@ -978,13 +1034,15 @@ static int rmi_probe(struct hid_device *hdev, const struct hid_device_id *id)
 
         mutex_init(&data->page_mutex);
 
+start:
         ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
         if (ret) {
                 hid_err(hdev, "hw start failed\n");
                 return ret;
         }
 
-        if (!test_bit(RMI_STARTED, &data->flags))
+        if ((data->device_flags & RMI_DEVICE) &&
+            !test_bit(RMI_STARTED, &data->flags))
                 /*
                  * The device maybe in the bootloader if rmi_input_configured
                  * failed to find F11 in the PDT. Print an error, but don't
@@ -1017,6 +1075,7 @@ static struct hid_driver rmi_driver = {
         .id_table               = rmi_id,
         .probe                  = rmi_probe,
         .remove                 = rmi_remove,
+        .event                  = rmi_event,
         .raw_event              = rmi_raw_event,
         .input_mapping          = rmi_input_mapping,
         .input_configured       = rmi_input_configured,