Fixed MTP to work with TWRP

drivers/pnp/core.c

@@ -0,0 +1,224 @@
+/*
+ * core.c - contains all core device and protocol registration functions
+ *
+ * Copyright 2002 Adam Belay <ambx1@neo.rr.com>
+ */
+
+#include <linux/pnp.h>
+#include <linux/types.h>
+#include <linux/list.h>
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+#include <linux/errno.h>
+#include <linux/dma-mapping.h>
+
+#include "base.h"
+
+static LIST_HEAD(pnp_protocols);
+LIST_HEAD(pnp_global);
+DEFINE_SPINLOCK(pnp_lock);
+
+/*
+ * ACPI or PNPBIOS should tell us about all platform devices, so we can
+ * skip some blind probes.  ISAPNP typically enumerates only plug-in ISA
+ * devices, not built-in things like COM ports.
+ */
+int pnp_platform_devices;
+EXPORT_SYMBOL(pnp_platform_devices);
+
+void *pnp_alloc(long size)
+{
+	void *result;
+
+	result = kzalloc(size, GFP_KERNEL);
+	if (!result) {
+		printk(KERN_ERR "pnp: Out of Memory\n");
+		return NULL;
+	}
+	return result;
+}
+
+/**
+ * pnp_protocol_register - adds a pnp protocol to the pnp layer
+ * @protocol: pointer to the corresponding pnp_protocol structure
+ *
+ *  Ex protocols: ISAPNP, PNPBIOS, etc
+ */
+int pnp_register_protocol(struct pnp_protocol *protocol)
+{
+	int nodenum;
+	struct list_head *pos;
+
+	INIT_LIST_HEAD(&protocol->devices);
+	INIT_LIST_HEAD(&protocol->cards);
+	nodenum = 0;
+	spin_lock(&pnp_lock);
+
+	/* assign the lowest unused number */
+	list_for_each(pos, &pnp_protocols) {
+		struct pnp_protocol *cur = to_pnp_protocol(pos);
+		if (cur->number == nodenum) {
+			pos = &pnp_protocols;
+			nodenum++;
+		}
+	}
+
+	list_add_tail(&protocol->protocol_list, &pnp_protocols);
+	spin_unlock(&pnp_lock);
+
+	protocol->number = nodenum;
+	dev_set_name(&protocol->dev, "pnp%d", nodenum);
+	return device_register(&protocol->dev);
+}
+
+/**
+ * pnp_protocol_unregister - removes a pnp protocol from the pnp layer
+ * @protocol: pointer to the corresponding pnp_protocol structure
+ */
+void pnp_unregister_protocol(struct pnp_protocol *protocol)
+{
+	spin_lock(&pnp_lock);
+	list_del(&protocol->protocol_list);
+	spin_unlock(&pnp_lock);
+	device_unregister(&protocol->dev);
+}
+
+static void pnp_free_ids(struct pnp_dev *dev)
+{
+	struct pnp_id *id;
+	struct pnp_id *next;
+
+	id = dev->id;
+	while (id) {
+		next = id->next;
+		kfree(id);
+		id = next;
+	}
+}
+
+void pnp_free_resource(struct pnp_resource *pnp_res)
+{
+	list_del(&pnp_res->list);
+	kfree(pnp_res);
+}
+
+void pnp_free_resources(struct pnp_dev *dev)
+{
+	struct pnp_resource *pnp_res, *tmp;
+
+	list_for_each_entry_safe(pnp_res, tmp, &dev->resources, list) {
+		pnp_free_resource(pnp_res);
+	}
+}
+
+static void pnp_release_device(struct device *dmdev)
+{
+	struct pnp_dev *dev = to_pnp_dev(dmdev);
+
+	pnp_free_ids(dev);
+	pnp_free_resources(dev);
+	pnp_free_options(dev);
+	kfree(dev);
+}
+
+struct pnp_dev *pnp_alloc_dev(struct pnp_protocol *protocol, int id,
+			      const char *pnpid)
+{
+	struct pnp_dev *dev;
+	struct pnp_id *dev_id;
+
+	dev = kzalloc(sizeof(struct pnp_dev), GFP_KERNEL);
+	if (!dev)
+		return NULL;
+
+	INIT_LIST_HEAD(&dev->resources);
+	INIT_LIST_HEAD(&dev->options);
+	dev->protocol = protocol;
+	dev->number = id;
+	dev->dma_mask = DMA_BIT_MASK(24);
+
+	dev->dev.parent = &dev->protocol->dev;
+	dev->dev.bus = &pnp_bus_type;
+	dev->dev.dma_mask = &dev->dma_mask;
+	dev->dev.coherent_dma_mask = dev->dma_mask;
+	dev->dev.release = &pnp_release_device;
+
+	dev_set_name(&dev->dev, "%02x:%02x", dev->protocol->number, dev->number);
+
+	dev_id = pnp_add_id(dev, pnpid);
+	if (!dev_id) {
+		kfree(dev);
+		return NULL;
+	}
+
+	return dev;
+}
+
+int __pnp_add_device(struct pnp_dev *dev)
+{
+	pnp_fixup_device(dev);
+	dev->status = PNP_READY;
+	spin_lock(&pnp_lock);
+	list_add_tail(&dev->global_list, &pnp_global);
+	list_add_tail(&dev->protocol_list, &dev->protocol->devices);
+	spin_unlock(&pnp_lock);
+	if (dev->protocol->can_wakeup)
+		device_set_wakeup_capable(&dev->dev,
+				dev->protocol->can_wakeup(dev));
+	return device_register(&dev->dev);
+}
+
+/*
+ * pnp_add_device - adds a pnp device to the pnp layer
+ * @dev: pointer to dev to add
+ *
+ *  adds to driver model, name database, fixups, interface, etc.
+ */
+int pnp_add_device(struct pnp_dev *dev)
+{
+	int ret;
+	char buf[128];
+	int len = 0;
+	struct pnp_id *id;
+
+	if (dev->card)
+		return -EINVAL;
+
+	ret = __pnp_add_device(dev);
+	if (ret)
+		return ret;
+
+	buf[0] = '\0';
+	for (id = dev->id; id; id = id->next)
+		len += scnprintf(buf + len, sizeof(buf) - len, " %s", id->id);
+
+	dev_printk(KERN_DEBUG, &dev->dev, "%s device, IDs%s (%s)\n",
+		   dev->protocol->name, buf,
+		   dev->active ? "active" : "disabled");
+	return 0;
+}
+
+void __pnp_remove_device(struct pnp_dev *dev)
+{
+	spin_lock(&pnp_lock);
+	list_del(&dev->global_list);
+	list_del(&dev->protocol_list);
+	spin_unlock(&pnp_lock);
+	device_unregister(&dev->dev);
+}
+
+static int __init pnp_init(void)
+{
+	return bus_register(&pnp_bus_type);
+}
+
+subsys_initcall(pnp_init);
+
+int pnp_debug;
+
+#if defined(CONFIG_PNP_DEBUG_MESSAGES)
+module_param_named(debug, pnp_debug, int, 0644);
+#endif