[PATCH 17/26] sh: maple: implement bus-level probe/remove

[Dmitry Torokhov <dmitry.torokhov@gmail.com>]

Implement probe() and remove() methods for the maple bus, and update
struct maple_driver to have its own probe() and remove() members that
take struct maple_device * directly.

Adjust all maple drivers (keyboard, mouse, joystick, vmu-flash) to
use these new bus-level methods, simplifying their probe and remove
functions by removing the need to cast from struct device * using
to_maple_dev().

Assisted-by: Antigravity:gemini-3.5-flash
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
---
 drivers/input/joystick/maplecontrol.c | 12 ++++--------
 drivers/input/keyboard/maple_keyb.c   | 14 +++++---------
 drivers/input/mouse/maplemouse.c      | 12 ++++--------
 drivers/mtd/maps/vmu-flash.c          | 13 ++++---------
 drivers/sh/maple/maple.c              | 27 ++++++++++++++++++++++++++-
 include/linux/maple.h                 |  2 ++
 6 files changed, 45 insertions(+), 35 deletions(-)

diff --git a/drivers/input/joystick/maplecontrol.c b/drivers/input/joystick/maplecontrol.c
index 955e01bcfa0c..6864243b0b4a 100644
--- a/drivers/input/joystick/maplecontrol.c
+++ b/drivers/input/joystick/maplecontrol.c
@@ -78,7 +78,7 @@ static void dc_pad_close(struct input_dev *dev)
 }
 
 /* allow the controller to be used */
-static int probe_maple_controller(struct device *dev)
+static int probe_maple_controller(struct maple_device *mdev)
 {
 	static const short btn_bit[32] = {
 		BTN_C, BTN_B, BTN_A, BTN_START, -1, -1, -1, -1,
@@ -94,7 +94,6 @@ static int probe_maple_controller(struct device *dev)
 		-1, -1, -1, -1, -1, -1, -1, -1,
 	};
 
-	struct maple_device *mdev = to_maple_dev(dev);
 	int i, error;
 	struct dc_pad *pad;
 	struct input_dev *idev;
@@ -145,23 +144,20 @@ static int probe_maple_controller(struct device *dev)
 	return error;
 }
 
-static int remove_maple_controller(struct device *dev)
+static void remove_maple_controller(struct maple_device *mdev)
 {
-	struct maple_device *mdev = to_maple_dev(dev);
 	struct dc_pad *pad = maple_get_drvdata(mdev);
 
 	input_unregister_device(pad->dev);
 	kfree(pad);
-
-	return 0;
 }
 
 static struct maple_driver dc_pad_driver = {
 	.function =	MAPLE_FUNC_CONTROLLER,
+	.probe =	probe_maple_controller,
+	.remove =	remove_maple_controller,
 	.drv = {
 		.name	= "Dreamcast_controller",
-		.probe	= probe_maple_controller,
-		.remove	= remove_maple_controller,
 	},
 };
 
diff --git a/drivers/input/keyboard/maple_keyb.c b/drivers/input/keyboard/maple_keyb.c
index e277b929a375..ab9257db7e03 100644
--- a/drivers/input/keyboard/maple_keyb.c
+++ b/drivers/input/keyboard/maple_keyb.c
@@ -158,15 +158,12 @@ static void dc_kbd_close(struct input_dev *dev)
 	maple_getcond_callback(mdev, NULL, 0, MAPLE_FUNC_KEYBOARD);
 }
 
-static int probe_maple_kbd(struct device *dev)
+static int probe_maple_kbd(struct maple_device *mdev)
 {
-	struct maple_device *mdev;
 	int i, error;
 	struct dc_kbd *kbd;
 	struct input_dev *idev;
 
-	mdev = to_maple_dev(dev);
-
 	kbd = kzalloc_obj(*kbd);
 	if (!kbd) {
 		error = -ENOMEM;
@@ -214,9 +211,8 @@ static int probe_maple_kbd(struct device *dev)
 	return error;
 }
 
-static int remove_maple_kbd(struct device *dev)
+static void remove_maple_kbd(struct maple_device *mdev)
 {
-	struct maple_device *mdev = to_maple_dev(dev);
 	struct dc_kbd *kbd = maple_get_drvdata(mdev);
 
 	guard(mutex)(&maple_keyb_mutex);
@@ -224,15 +220,15 @@ static int remove_maple_kbd(struct device *dev)
 	input_unregister_device(kbd->dev);
 	kfree(kbd);
 
-	return 0;
+
 }
 
 static struct maple_driver dc_kbd_driver = {
 	.function = MAPLE_FUNC_KEYBOARD,
+	.probe =	probe_maple_kbd,
+	.remove =	remove_maple_kbd,
 	.drv = {
 		.name = "Dreamcast_keyboard",
-		.probe = probe_maple_kbd,
-		.remove = remove_maple_kbd,
 	},
 };
 
diff --git a/drivers/input/mouse/maplemouse.c b/drivers/input/mouse/maplemouse.c
index f67e3eb5841b..03cb666d278d 100644
--- a/drivers/input/mouse/maplemouse.c
+++ b/drivers/input/mouse/maplemouse.c
@@ -64,9 +64,8 @@ static void dc_mouse_close(struct input_dev *dev)
 }
 
 /* allow the mouse to be used */
-static int probe_maple_mouse(struct device *dev)
+static int probe_maple_mouse(struct maple_device *mdev)
 {
-	struct maple_device *mdev = to_maple_dev(dev);
 	int error;
 	struct input_dev *input_dev;
 	struct dc_mouse *mse;
@@ -111,23 +110,20 @@ static int probe_maple_mouse(struct device *dev)
 	return error;
 }
 
-static int remove_maple_mouse(struct device *dev)
+static void remove_maple_mouse(struct maple_device *mdev)
 {
-	struct maple_device *mdev = to_maple_dev(dev);
 	struct dc_mouse *mse = maple_get_drvdata(mdev);
 
 	input_unregister_device(mse->dev);
 	kfree(mse);
-
-	return 0;
 }
 
 static struct maple_driver dc_mouse_driver = {
 	.function =	MAPLE_FUNC_MOUSE,
+	.probe =	probe_maple_mouse,
+	.remove =	remove_maple_mouse,
 	.drv = {
 		.name = "Dreamcast_mouse",
-		.probe = probe_maple_mouse,
-		.remove = remove_maple_mouse,
 	},
 };
 
diff --git a/drivers/mtd/maps/vmu-flash.c b/drivers/mtd/maps/vmu-flash.c
index 8f7028ac1b56..c34c768dfb87 100644
--- a/drivers/mtd/maps/vmu-flash.c
+++ b/drivers/mtd/maps/vmu-flash.c
@@ -769,30 +769,25 @@ static void vmu_file_error(struct maple_device *mdev, void *recvbuf)
 }
 
 
-static int probe_maple_vmu(struct device *dev)
+static int probe_maple_vmu(struct maple_device *mdev)
 {
-	struct maple_device *mdev = to_maple_dev(dev);
-
 	mdev->can_unload = vmu_can_unload;
 	mdev->fileerr_handler = vmu_file_error;
 
 	return vmu_connect(mdev);
 }
 
-static int remove_maple_vmu(struct device *dev)
+static void remove_maple_vmu(struct maple_device *mdev)
 {
-	struct maple_device *mdev = to_maple_dev(dev);
-
 	vmu_disconnect(mdev);
-	return 0;
 }
 
 static struct maple_driver vmu_flash_driver = {
 	.function =	MAPLE_FUNC_MEMCARD,
+	.probe =	probe_maple_vmu,
+	.remove =	remove_maple_vmu,
 	.drv = {
 		.name =		"Dreamcast_visual_memory",
-		.probe =	probe_maple_vmu,
-		.remove =	remove_maple_vmu,
 	},
 };
 
diff --git a/drivers/sh/maple/maple.c b/drivers/sh/maple/maple.c
index 35aff2e57d2c..c0715e3ace6f 100644
--- a/drivers/sh/maple/maple.c
+++ b/drivers/sh/maple/maple.c
@@ -721,6 +721,11 @@ static irqreturn_t maple_vblank_interrupt(int irq, void *dev_id)
 	return IRQ_HANDLED;
 }
 
+/*
+ * We pass &maple_bus as dev_id for the shared interrupts because
+ * the kernel requires a unique non-NULL token for shared IRQs,
+ * even though the handlers themselves ignore it.
+ */
 static int maple_set_dma_interrupt_handler(void)
 {
 	return request_irq(HW_EVENT_MAPLE_DMA, maple_dma_interrupt,
@@ -765,9 +770,30 @@ static void maple_bus_release(struct device *dev)
 /*
  * maple_bus_type - core maple bus structure
  */
+static int maple_bus_probe(struct device *dev)
+{
+	struct maple_driver *maple_drv = to_maple_driver(dev->driver);
+	struct maple_device *maple_dev = to_maple_dev(dev);
+
+	if (maple_drv->probe)
+		return maple_drv->probe(maple_dev);
+	return -ENODEV;
+}
+
+static void maple_bus_remove(struct device *dev)
+{
+	struct maple_driver *maple_drv = to_maple_driver(dev->driver);
+	struct maple_device *maple_dev = to_maple_dev(dev);
+
+	if (maple_drv->remove)
+		maple_drv->remove(maple_dev);
+}
+
 static const struct bus_type maple_bus_type = {
 	.name = "maple",
 	.match = maple_match_bus_driver,
+	.probe = maple_bus_probe,
+	.remove = maple_bus_remove,
 };
 
 static struct device maple_bus = {
@@ -790,7 +816,6 @@ static int __init maple_bus_init(void)
 	if (retval)
 		goto cleanup_device;
 
-
 	/* allocate memory for maple bus dma */
 	retval = maple_get_dma_buffer();
 	if (retval) {
diff --git a/include/linux/maple.h b/include/linux/maple.h
index 90c26c86e3ed..641cf3330409 100644
--- a/include/linux/maple.h
+++ b/include/linux/maple.h
@@ -80,6 +80,8 @@ struct maple_device {
 
 struct maple_driver {
 	unsigned long function;
+	int (*probe)(struct maple_device *dev);
+	void (*remove)(struct maple_device *dev);
 	struct device_driver drv;
 };
 

-- 
2.55.0.rc0.799.gd6f94ed593-goog