HID: wacom: Introduce new 'touch_input' device

Instead of having a single 'input_dev' device that will take either pen
or touch data depending on the type of the device, create seperate devices
devices for each. By splitting things like this, we can support devices
(e.g. the I2C "AES" sensors in some newer tablet PCs) that send both pen
and touch reports from a single endpoint.

Signed-off-by: Jason Gerecke <jason.gerecke@wacom.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

3 files changed, 139 insertions, 101 deletions

diff --git a/drivers/hid/wacom_sys.c b/drivers/hid/wacom_sys.c
index ca15c7f59dc7..4c0ffca97bef 100644
--- a/drivers/hid/wacom_sys.c
+++ b/drivers/hid/wacom_sys.c
@@ -253,7 +253,7 @@ static void wacom_post_parse_hid(struct hid_device *hdev,
         if (features->type == HID_GENERIC) {
                 /* Any last-minute generic device setup */
                 if (features->touch_max > 1) {
-                        input_mt_init_slots(wacom_wac->input, wacom_wac->features.touch_max,
+                        input_mt_init_slots(wacom_wac->touch_input, wacom_wac->features.touch_max,
                                     INPUT_MT_DIRECT);
                 }
         }
@@ -1130,7 +1130,7 @@ static struct input_dev *wacom_allocate_input(struct wacom *wacom)
         if (!input_dev)
                 return NULL;
 
-        input_dev->name = wacom_wac->name;
+        input_dev->name = wacom_wac->pen_name;
         input_dev->phys = hdev->phys;
         input_dev->dev.parent = &hdev->dev;
         input_dev->open = wacom_open;
@@ -1149,27 +1149,33 @@ static void wacom_free_inputs(struct wacom *wacom)
 {
         struct wacom_wac *wacom_wac = &(wacom->wacom_wac);
 
-        if (wacom_wac->input)
-                input_free_device(wacom_wac->input);
+        if (wacom_wac->pen_input)
+                input_free_device(wacom_wac->pen_input);
+        if (wacom_wac->touch_input)
+                input_free_device(wacom_wac->touch_input);
         if (wacom_wac->pad_input)
                 input_free_device(wacom_wac->pad_input);
-        wacom_wac->input = NULL;
+        wacom_wac->pen_input = NULL;
+        wacom_wac->touch_input = NULL;
         wacom_wac->pad_input = NULL;
 }
 
 static int wacom_allocate_inputs(struct wacom *wacom)
 {
-        struct input_dev *input_dev, *pad_input_dev;
+        struct input_dev *pen_input_dev, *touch_input_dev, *pad_input_dev;
         struct wacom_wac *wacom_wac = &(wacom->wacom_wac);
 
-        input_dev = wacom_allocate_input(wacom);
+        pen_input_dev = wacom_allocate_input(wacom);
+        touch_input_dev = wacom_allocate_input(wacom);
         pad_input_dev = wacom_allocate_input(wacom);
-        if (!input_dev || !pad_input_dev) {
+        if (!pen_input_dev || !touch_input_dev || !pad_input_dev) {
                 wacom_free_inputs(wacom);
                 return -ENOMEM;
         }
 
-        wacom_wac->input = input_dev;
+        wacom_wac->pen_input = pen_input_dev;
+        wacom_wac->touch_input = touch_input_dev;
+        wacom_wac->touch_input->name = wacom_wac->touch_name;
         wacom_wac->pad_input = pad_input_dev;
         wacom_wac->pad_input->name = wacom_wac->pad_name;
 
@@ -1178,11 +1184,17 @@ static int wacom_allocate_inputs(struct wacom *wacom)
 
 static void wacom_clean_inputs(struct wacom *wacom)
 {
-        if (wacom->wacom_wac.input) {
-                if (wacom->wacom_wac.input_registered)
-                        input_unregister_device(wacom->wacom_wac.input);
+        if (wacom->wacom_wac.pen_input) {
+                if (wacom->wacom_wac.pen_registered)
+                        input_unregister_device(wacom->wacom_wac.pen_input);
                 else
-                        input_free_device(wacom->wacom_wac.input);
+                        input_free_device(wacom->wacom_wac.pen_input);
+        }
+        if (wacom->wacom_wac.touch_input) {
+                if (wacom->wacom_wac.touch_registered)
+                        input_unregister_device(wacom->wacom_wac.touch_input);
+                else
+                        input_free_device(wacom->wacom_wac.touch_input);
         }
         if (wacom->wacom_wac.pad_input) {
                 if (wacom->wacom_wac.pad_registered)
@@ -1190,33 +1202,49 @@ static void wacom_clean_inputs(struct wacom *wacom)
                 else
                         input_free_device(wacom->wacom_wac.pad_input);
         }
-        wacom->wacom_wac.input = NULL;
+        wacom->wacom_wac.pen_input = NULL;
+        wacom->wacom_wac.touch_input = NULL;
         wacom->wacom_wac.pad_input = NULL;
         wacom_destroy_leds(wacom);
 }
 
 static int wacom_register_inputs(struct wacom *wacom)
 {
-        struct input_dev *input_dev, *pad_input_dev;
+        struct input_dev *pen_input_dev, *touch_input_dev, *pad_input_dev;
         struct wacom_wac *wacom_wac = &(wacom->wacom_wac);
-        struct wacom_features *features = &wacom_wac->features;
         int error = 0;
 
-        input_dev = wacom_wac->input;
+        pen_input_dev = wacom_wac->pen_input;
+        touch_input_dev = wacom_wac->touch_input;
         pad_input_dev = wacom_wac->pad_input;
 
-        if (!input_dev || !pad_input_dev)
+        if (!pen_input_dev || !touch_input_dev || !pad_input_dev)
                 return -EINVAL;
 
-        if (features->device_type & WACOM_DEVICETYPE_PEN)
-                error = wacom_setup_pen_input_capabilities(input_dev, wacom_wac);
-        if (!error && features->device_type & WACOM_DEVICETYPE_TOUCH)
-                error = wacom_setup_touch_input_capabilities(input_dev, wacom_wac);
-        if (!error) {
-                error = input_register_device(input_dev);
+        error = wacom_setup_pen_input_capabilities(pen_input_dev, wacom_wac);
+        if (error) {
+                /* no pen in use on this interface */
+                input_free_device(pen_input_dev);
+                wacom_wac->pen_input = NULL;
+                pen_input_dev = NULL;
+        } else {
+                error = input_register_device(pen_input_dev);
+                if (error)
+                        goto fail_register_pen_input;
+                wacom_wac->pen_registered = true;
+        }
+
+        error = wacom_setup_touch_input_capabilities(touch_input_dev, wacom_wac);
+        if (error) {
+                /* no touch in use on this interface */
+                input_free_device(touch_input_dev);
+                wacom_wac->touch_input = NULL;
+                touch_input_dev = NULL;
+        } else {
+                error = input_register_device(touch_input_dev);
                 if (error)
-                        return error;
-                wacom_wac->input_registered = true;
+                        goto fail_register_touch_input;
+                wacom_wac->touch_registered = true;
         }
 
         error = wacom_setup_pad_input_capabilities(pad_input_dev, wacom_wac);
@@ -1243,9 +1271,14 @@ fail_leds:
         pad_input_dev = NULL;
         wacom_wac->pad_registered = false;
 fail_register_pad_input:
-        input_unregister_device(input_dev);
-        wacom_wac->input = NULL;
-        wacom_wac->input_registered = false;
+        input_unregister_device(touch_input_dev);
+        wacom_wac->touch_input = NULL;
+        wacom_wac->touch_registered = false;
+fail_register_touch_input:
+        input_unregister_device(pen_input_dev);
+        wacom_wac->pen_input = NULL;
+        wacom_wac->pen_registered = false;
+fail_register_pen_input:
         return error;
 }
 
@@ -1306,7 +1339,7 @@ static void wacom_wireless_work(struct work_struct *work)
                 if (wacom_wac1->features.type != INTUOSHT &&
                     wacom_wac1->features.type != BAMBOO_PT)
                         wacom_wac1->features.device_type |= WACOM_DEVICETYPE_PAD;
-                snprintf(wacom_wac1->name, WACOM_NAME_MAX, "%s (WL) Pen",
+                snprintf(wacom_wac1->pen_name, WACOM_NAME_MAX, "%s (WL) Pen",
                          wacom_wac1->features.name);
                 snprintf(wacom_wac1->pad_name, WACOM_NAME_MAX, "%s (WL) Pad",
                          wacom_wac1->features.name);
@@ -1325,7 +1358,7 @@ static void wacom_wireless_work(struct work_struct *work)