1 files changed, 457 insertions, 0 deletions
diff --git a/drivers/pnp/card.c b/drivers/pnp/card.c
new file mode 100644
index 000000000..9610a9f08
--- /dev/null
+++ b/drivers/pnp/card.c
@@ -0,0 +1,457 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * card.c - contains functions for managing groups of PnP devices
+ *
+ * Copyright 2002 Adam Belay <ambx1@neo.rr.com>
+ */
+
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/ctype.h>
+#include <linux/slab.h>
+#include <linux/pnp.h>
+#include <linux/dma-mapping.h>
+#include "base.h"
+
+LIST_HEAD(pnp_cards);
+static LIST_HEAD(pnp_card_drivers);
+
+static const struct pnp_card_device_id *match_card(struct pnp_card_driver *drv,
+						   struct pnp_card *card)
+{
+	const struct pnp_card_device_id *drv_id = drv->id_table;
+
+	while (*drv_id->id) {
+		if (compare_pnp_id(card->id, drv_id->id)) {
+			int i = 0;
+
+			for (;;) {
+				int found;
+				struct pnp_dev *dev;
+
+				if (i == PNP_MAX_DEVICES ||
+				    !*drv_id->devs[i].id)
+					return drv_id;
+				found = 0;
+				card_for_each_dev(card, dev) {
+					if (compare_pnp_id(dev->id,
+						   drv_id->devs[i].id)) {
+						found = 1;
+						break;
+					}
+				}
+				if (!found)
+					break;
+				i++;
+			}
+		}
+		drv_id++;
+	}
+	return NULL;
+}
+
+static void card_remove(struct pnp_dev *dev)
+{
+	dev->card_link = NULL;
+}
+
+static void card_remove_first(struct pnp_dev *dev)
+{
+	struct pnp_card_driver *drv = to_pnp_card_driver(dev->driver);
+
+	if (!dev->card || !drv)
+		return;
+	if (drv->remove)
+		drv->remove(dev->card_link);
+	drv->link.remove = &card_remove;
+	kfree(dev->card_link);
+	card_remove(dev);
+}
+
+static int card_probe(struct pnp_card *card, struct pnp_card_driver *drv)
+{
+	const struct pnp_card_device_id *id;
+	struct pnp_card_link *clink;
+	struct pnp_dev *dev;
+
+	if (!drv->probe)
+		return 0;
+	id = match_card(drv, card);
+	if (!id)
+		return 0;
+
+	clink = kzalloc(sizeof(*clink), GFP_KERNEL);
+	if (!clink)
+		return 0;
+	clink->card = card;
+	clink->driver = drv;
+	clink->pm_state = PMSG_ON;
+
+	if (drv->probe(clink, id) >= 0)
+		return 1;
+
+	/* Recovery */
+	card_for_each_dev(card, dev) {
+		if (dev->card_link == clink)
+			pnp_release_card_device(dev);
+	}
+	kfree(clink);
+	return 0;
+}
+
+/**
+ * pnp_add_card_id - adds an EISA id to the specified card
+ * @id: pointer to a pnp_id structure
+ * @card: pointer to the desired card
+ */
+static struct pnp_id *pnp_add_card_id(struct pnp_card *card, char *id)
+{
+	struct pnp_id *dev_id, *ptr;
+
+	dev_id = kzalloc(sizeof(struct pnp_id), GFP_KERNEL);
+	if (!dev_id)
+		return NULL;
+
+	dev_id->id[0] = id[0];
+	dev_id->id[1] = id[1];
+	dev_id->id[2] = id[2];
+	dev_id->id[3] = tolower(id[3]);
+	dev_id->id[4] = tolower(id[4]);
+	dev_id->id[5] = tolower(id[5]);
+	dev_id->id[6] = tolower(id[6]);
+	dev_id->id[7] = '\0';
+
+	dev_id->next = NULL;
+	ptr = card->id;
+	while (ptr && ptr->next)
+		ptr = ptr->next;
+	if (ptr)
+		ptr->next = dev_id;
+	else
+		card->id = dev_id;
+
+	return dev_id;
+}
+
+static void pnp_free_card_ids(struct pnp_card *card)
+{
+	struct pnp_id *id;
+	struct pnp_id *next;
+
+	id = card->id;
+	while (id) {
+		next = id->next;
+		kfree(id);
+		id = next;
+	}
+}
+
+static void pnp_release_card(struct device *dmdev)
+{
+	struct pnp_card *card = to_pnp_card(dmdev);
+
+	pnp_free_card_ids(card);
+	kfree(card);
+}
+
+struct pnp_card *pnp_alloc_card(struct pnp_protocol *protocol, int id, char *pnpid)
+{
+	struct pnp_card *card;
+	struct pnp_id *dev_id;
+
+	card = kzalloc(sizeof(struct pnp_card), GFP_KERNEL);
+	if (!card)
+		return NULL;
+
+	card->protocol = protocol;
+	card->number = id;
+
+	card->dev.parent = &card->protocol->dev;
+	dev_set_name(&card->dev, "%02x:%02x", card->protocol->number, card->number);
+
+	card->dev.coherent_dma_mask = DMA_BIT_MASK(24);
+	card->dev.dma_mask = &card->dev.coherent_dma_mask;
+
+	dev_id = pnp_add_card_id(card, pnpid);
+	if (!dev_id) {
+		kfree(card);
+		return NULL;
+	}
+
+	return card;
+}
+
+static ssize_t name_show(struct device *dmdev,
+			 struct device_attribute *attr, char *buf)
+{
+	char *str = buf;
+	struct pnp_card *card = to_pnp_card(dmdev);
+
+	str += sprintf(str, "%s\n", card->name);
+	return (str - buf);
+}
+
+static DEVICE_ATTR_RO(name);
+
+static ssize_t card_id_show(struct device *dmdev,
+			    struct device_attribute *attr, char *buf)
+{
+	char *str = buf;
+	struct pnp_card *card = to_pnp_card(dmdev);
+	struct pnp_id *pos = card->id;
+
+	while (pos) {
+		str += sprintf(str, "%s\n", pos->id);
+		pos = pos->next;
+	}
+	return (str - buf);
+}
+
+static DEVICE_ATTR_RO(card_id);
+
+static int pnp_interface_attach_card(struct pnp_card *card)
+{
+	int rc = device_create_file(&card->dev, &dev_attr_name);
+
+	if (rc)
+		return rc;
+
+	rc = device_create_file(&card->dev, &dev_attr_card_id);
+	if (rc)
+		goto err_name;
+
+	return 0;
+
+err_name:
+	device_remove_file(&card->dev, &dev_attr_name);
+	return rc;
+}
+
+/**
+ * pnp_add_card - adds a PnP card to the PnP Layer
+ * @card: pointer to the card to add
+ */
+int pnp_add_card(struct pnp_card *card)
+{
+	int error;
+	struct list_head *pos, *temp;
+
+	card->dev.bus = NULL;
+	card->dev.release = &pnp_release_card;
+	error = device_register(&card->dev);
+	if (error) {
+		dev_err(&card->dev, "could not register (err=%d)\n", error);
+		put_device(&card->dev);
+		return error;
+	}
+
+	pnp_interface_attach_card(card);
+	mutex_lock(&pnp_lock);
+	list_add_tail(&card->global_list, &pnp_cards);
+	list_add_tail(&card->protocol_list, &card->protocol->cards);
+	mutex_unlock(&pnp_lock);
+
+	/* we wait until now to add devices in order to ensure the drivers
+	 * will be able to use all of the related devices on the card
+	 * without waiting an unreasonable length of time */
+	list_for_each(pos, &card->devices) {
+		struct pnp_dev *dev = card_to_pnp_dev(pos);
+		__pnp_add_device(dev);
+	}
+
+	/* match with card drivers */
+	list_for_each_safe(pos, temp, &pnp_card_drivers) {
+		struct pnp_card_driver *drv =
+		    list_entry(pos, struct pnp_card_driver,
+			       global_list);
+		card_probe(card, drv);
+	}
+	return 0;
+}
+
+/**
+ * pnp_remove_card - removes a PnP card from the PnP Layer
+ * @card: pointer to the card to remove
+ */
+void pnp_remove_card(struct pnp_card *card)
+{
+	struct list_head *pos, *temp;
+
+	device_unregister(&card->dev);
+	mutex_lock(&pnp_lock);
+	list_del(&card->global_list);
+	list_del(&card->protocol_list);
+	mutex_unlock(&pnp_lock);
+	list_for_each_safe(pos, temp, &card->devices) {
+		struct pnp_dev *dev = card_to_pnp_dev(pos);
+		pnp_remove_card_device(dev);
+	}
+}
+
+/**
+ * pnp_add_card_device - adds a device to the specified card
+ * @card: pointer to the card to add to
+ * @dev: pointer to the device to add
+ */
+int pnp_add_card_device(struct pnp_card *card, struct pnp_dev *dev)
+{
+	dev->dev.parent = &card->dev;
+	dev->card_link = NULL;
+	dev_set_name(&dev->dev, "%02x:%02x.%02x",
+		     dev->protocol->number, card->number, dev->number);
+	mutex_lock(&pnp_lock);
+	dev->card = card;
+	list_add_tail(&dev->card_list, &card->devices);
+	mutex_unlock(&pnp_lock);
+	return 0;
+}
+
+/**
+ * pnp_remove_card_device- removes a device from the specified card
+ * @dev: pointer to the device to remove
+ */
+void pnp_remove_card_device(struct pnp_dev *dev)
+{
+	mutex_lock(&pnp_lock);
+	dev->card = NULL;
+	list_del(&dev->card_list);
+	mutex_unlock(&pnp_lock);
+	__pnp_remove_device(dev);
+}
+
+/**
+ * pnp_request_card_device - Searches for a PnP device under the specified card
+ * @clink: pointer to the card link, cannot be NULL
+ * @id: pointer to a PnP ID structure that explains the rules for finding the device
+ * @from: Starting place to search from. If NULL it will start from the beginning.
+ */
+struct pnp_dev *pnp_request_card_device(struct pnp_card_link *clink,
+					const char *id, struct pnp_dev *from)
+{
+	struct list_head *pos;
+	struct pnp_dev *dev;
+	struct pnp_card_driver *drv;
+	struct pnp_card *card;
+
+	if (!clink || !id)
+		return NULL;
+
+	card = clink->card;
+	drv = clink->driver;
+	if (!from) {
+		pos = card->devices.next;
+	} else {
+		if (from->card != card)
+			return NULL;
+		pos = from->card_list.next;
+	}
+	while (pos != &card->devices) {
+		dev = card_to_pnp_dev(pos);
+		if ((!dev->card_link) && compare_pnp_id(dev->id, id))
+			goto found;
+		pos = pos->next;
+	}
+
+	return NULL;
+
+found:
+	dev->card_link = clink;
+	dev->dev.driver = &drv->link.driver;
+	if (pnp_bus_type.probe(&dev->dev))
+		goto err_out;
+	if (device_bind_driver(&dev->dev))
+		goto err_out;
+
+	return dev;
+
+err_out:
+	dev->dev.driver = NULL;
+	dev->card_link = NULL;
+	return NULL;
+}
+EXPORT_SYMBOL(pnp_request_card_device);
+
+/**
+ * pnp_release_card_device - call this when the driver no longer needs the device
+ * @dev: pointer to the PnP device structure
+ */
+void pnp_release_card_device(struct pnp_dev *dev)
+{
+	struct pnp_card_driver *drv = dev->card_link->driver;
+
+	drv->link.remove = &card_remove;
+	device_release_driver(&dev->dev);
+	drv->link.remove = &card_remove_first;
+}
+EXPORT_SYMBOL(pnp_release_card_device);
+
+/*
+ * suspend/resume callbacks
+ */
+static int card_suspend(struct pnp_dev *dev, pm_message_t state)
+{
+	struct pnp_card_link *link = dev->card_link;
+
+	if (link->pm_state.event == state.event)
+		return 0;
+	link->pm_state = state;
+	return link->driver->suspend(link, state);
+}
+
+static int card_resume(struct pnp_dev *dev)
+{
+	struct pnp_card_link *link = dev->card_link;
+
+	if (link->pm_state.event == PM_EVENT_ON)
+		return 0;
+	link->pm_state = PMSG_ON;
+	link->driver->resume(link);
+	return 0;
+}
+
+/**
+ * pnp_register_card_driver - registers a PnP card driver with the PnP Layer
+ * @drv: pointer to the driver to register
+ */
+int pnp_register_card_driver(struct pnp_card_driver *drv)
+{
+	int error;
+	struct list_head *pos, *temp;
+
+	drv->link.name = drv->name;
+	drv->link.id_table = NULL;	/* this will disable auto matching */
+	drv->link.flags = drv->flags;
+	drv->link.probe = NULL;
+	drv->link.remove = &card_remove_first;
+	drv->link.suspend = drv->suspend ? card_suspend : NULL;
+	drv->link.resume = drv->resume ? card_resume : NULL;
+
+	error = pnp_register_driver(&drv->link);
+	if (error < 0)
+		return error;
+
+	mutex_lock(&pnp_lock);
+	list_add_tail(&drv->global_list, &pnp_card_drivers);
+	mutex_unlock(&pnp_lock);
+
+	list_for_each_safe(pos, temp, &pnp_cards) {
+		struct pnp_card *card =
+		    list_entry(pos, struct pnp_card, global_list);
+		card_probe(card, drv);
+	}
+	return 0;
+}
+EXPORT_SYMBOL(pnp_register_card_driver);
+
+/**
+ * pnp_unregister_card_driver - unregisters a PnP card driver from the PnP Layer
+ * @drv: pointer to the driver to unregister
+ */
+void pnp_unregister_card_driver(struct pnp_card_driver *drv)
+{
+	mutex_lock(&pnp_lock);
+	list_del(&drv->global_list);
+	mutex_unlock(&pnp_lock);
+	pnp_unregister_driver(&drv->link);
+}
+EXPORT_SYMBOL(pnp_unregister_card_driver);