--- /dev/null
+/*
+ * Sony MemoryStick support
+ *
+ * Copyright (C) 2007 Alex Dubov <oakad@yahoo.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Special thanks to Carlos Corbacho for providing various MemoryStick cards
+ * that made this driver possible.
+ *
+ */
+
+#include <linux/memstick.h>
+#include <linux/idr.h>
+#include <linux/fs.h>
+#include <linux/delay.h>
+
+#define DRIVER_NAME "memstick"
+#define DRIVER_VERSION "0.2"
+
+static unsigned int cmd_retries = 3;
+module_param(cmd_retries, uint, 0644);
+
+static struct workqueue_struct *workqueue;
+static DEFINE_IDR(memstick_host_idr);
+static DEFINE_SPINLOCK(memstick_host_lock);
+
+static int memstick_dev_match(struct memstick_dev *card,
+ struct memstick_device_id *id)
+{
+ if (id->match_flags & MEMSTICK_MATCH_ALL) {
+ if ((id->type == card->id.type)
+ && (id->category == card->id.category)
+ && (id->class == card->id.class))
+ return 1;
+ }
+
+ return 0;
+}
+
+static int memstick_bus_match(struct device *dev, struct device_driver *drv)
+{
+ struct memstick_dev *card = container_of(dev, struct memstick_dev,
+ dev);
+ struct memstick_driver *ms_drv = container_of(drv,
+ struct memstick_driver,
+ driver);
+ struct memstick_device_id *ids = ms_drv->id_table;
+
+ if (ids) {
+ while (ids->match_flags) {
+ if (memstick_dev_match(card, ids))
+ return 1;
+ ++ids;
+ }
+ }
+ return 0;
+}
+
+static int memstick_uevent(struct device *dev, struct kobj_uevent_env *env)
+{
+ struct memstick_dev *card = container_of(dev, struct memstick_dev,
+ dev);
+
+ if (add_uevent_var(env, "MEMSTICK_TYPE=%02X", card->id.type))
+ return -ENOMEM;
+
+ if (add_uevent_var(env, "MEMSTICK_CATEGORY=%02X", card->id.category))
+ return -ENOMEM;
+
+ if (add_uevent_var(env, "MEMSTICK_CLASS=%02X", card->id.class))
+ return -ENOMEM;
+
+ return 0;
+}
+
+static int memstick_device_probe(struct device *dev)
+{
+ struct memstick_dev *card = container_of(dev, struct memstick_dev,
+ dev);
+ struct memstick_driver *drv = container_of(dev->driver,
+ struct memstick_driver,
+ driver);
+ int rc = -ENODEV;
+
+ if (dev->driver && drv->probe) {
+ rc = drv->probe(card);
+ if (!rc)
+ get_device(dev);
+ }
+ return rc;
+}
+
+static int memstick_device_remove(struct device *dev)
+{
+ struct memstick_dev *card = container_of(dev, struct memstick_dev,
+ dev);
+ struct memstick_driver *drv = container_of(dev->driver,
+ struct memstick_driver,
+ driver);
+
+ if (dev->driver && drv->remove) {
+ drv->remove(card);
+ card->dev.driver = NULL;
+ }
+
+ put_device(dev);
+ return 0;
+}
+
+#ifdef CONFIG_PM
+
+static int memstick_device_suspend(struct device *dev, pm_message_t state)
+{
+ struct memstick_dev *card = container_of(dev, struct memstick_dev,
+ dev);
+ struct memstick_driver *drv = container_of(dev->driver,
+ struct memstick_driver,
+ driver);
+
+ if (dev->driver && drv->suspend)
+ return drv->suspend(card, state);
+ return 0;
+}
+
+static int memstick_device_resume(struct device *dev)
+{
+ struct memstick_dev *card = container_of(dev, struct memstick_dev,
+ dev);
+ struct memstick_driver *drv = container_of(dev->driver,
+ struct memstick_driver,
+ driver);
+
+ if (dev->driver && drv->resume)
+ return drv->resume(card);
+ return 0;
+}
+
+#else
+
+#define memstick_device_suspend NULL
+#define memstick_device_resume NULL
+
+#endif /* CONFIG_PM */
+
+#define MEMSTICK_ATTR(name, format) \
+static ssize_t name##_show(struct device *dev, struct device_attribute *attr, \
+ char *buf) \
+{ \
+ struct memstick_dev *card = container_of(dev, struct memstick_dev, \
+ dev); \
+ return sprintf(buf, format, card->id.name); \
+}
+
+MEMSTICK_ATTR(type, "%02X");
+MEMSTICK_ATTR(category, "%02X");
+MEMSTICK_ATTR(class, "%02X");
+
+#define MEMSTICK_ATTR_RO(name) __ATTR(name, S_IRUGO, name##_show, NULL)
+
+static struct device_attribute memstick_dev_attrs[] = {
+ MEMSTICK_ATTR_RO(type),
+ MEMSTICK_ATTR_RO(category),
+ MEMSTICK_ATTR_RO(class),
+ __ATTR_NULL
+};
+
+static struct bus_type memstick_bus_type = {
+ .name = "memstick",
+ .dev_attrs = memstick_dev_attrs,
+ .match = memstick_bus_match,
+ .uevent = memstick_uevent,
+ .probe = memstick_device_probe,
+ .remove = memstick_device_remove,
+ .suspend = memstick_device_suspend,
+ .resume = memstick_device_resume
+};
+
+static void memstick_free(struct class_device *cdev)
+{
+ struct memstick_host *host = container_of(cdev, struct memstick_host,
+ cdev);
+ kfree(host);
+}
+
+static struct class memstick_host_class = {
+ .name = "memstick_host",
+ .release = memstick_free
+};
+
+static void memstick_free_card(struct device *dev)
+{
+ struct memstick_dev *card = container_of(dev, struct memstick_dev,
+ dev);
+ kfree(card);
+}
+
+static int memstick_dummy_check(struct memstick_dev *card)
+{
+ return 0;
+}
+
+/**
+ * memstick_detect_change - schedule media detection on memstick host
+ * @host - host to use
+ */
+void memstick_detect_change(struct memstick_host *host)
+{
+ queue_work(workqueue, &host->media_checker);
+}
+EXPORT_SYMBOL(memstick_detect_change);
+
+/**
+ * memstick_next_req - called by host driver to obtain next request to process
+ * @host - host to use
+ * @mrq - pointer to stick the request to
+ *
+ * Host calls this function from idle state (*mrq == NULL) or after finishing
+ * previous request (*mrq should point to it). If previous request was
+ * unsuccessful, it is retried for predetermined number of times. Return value
+ * of 0 means that new request was assigned to the host.
+ */
+int memstick_next_req(struct memstick_host *host, struct memstick_request **mrq)
+{
+ int rc = -ENXIO;
+
+ if ((*mrq) && (*mrq)->error && host->retries) {
+ (*mrq)->error = rc;
+ host->retries--;
+ return 0;
+ }
+
+ if (host->card && host->card->next_request)
+ rc = host->card->next_request(host->card, mrq);
+
+ if (!rc)
+ host->retries = cmd_retries;
+ else
+ *mrq = NULL;
+
+ return rc;
+}
+EXPORT_SYMBOL(memstick_next_req);
+
+/**
+ * memstick_new_req - notify the host that some requests are pending
+ * @host - host to use
+ */
+void memstick_new_req(struct memstick_host *host)
+{
+ host->retries = cmd_retries;
+ host->request(host);
+}
+EXPORT_SYMBOL(memstick_new_req);
+
+/**
+ * memstick_init_req_sg - set request fields needed for bulk data transfer
+ * @mrq - request to use
+ * @tpc - memstick Transport Protocol Command
+ * @sg - TPC argument
+ */
+void memstick_init_req_sg(struct memstick_request *mrq, unsigned char tpc,
+ struct scatterlist *sg)
+{
+ mrq->tpc = tpc;
+ if (tpc & 8)
+ mrq->data_dir = WRITE;
+ else
+ mrq->data_dir = READ;
+
+ mrq->sg = *sg;
+ mrq->io_type = MEMSTICK_IO_SG;
+
+ if (tpc == MS_TPC_SET_CMD || tpc == MS_TPC_EX_SET_CMD)
+ mrq->need_card_int = 1;
+ else
+ mrq->need_card_int = 0;
+
+ mrq->get_int_reg = 0;
+}
+EXPORT_SYMBOL(memstick_init_req_sg);
+
+/**
+ * memstick_init_req - set request fields needed for short data transfer
+ * @mrq - request to use
+ * @tpc - memstick Transport Protocol Command
+ * @buf - TPC argument buffer
+ * @length - TPC argument size
+ *
+ * The intended use of this function (transfer of data items several bytes
+ * in size) allows us to just copy the value between request structure and
+ * user supplied buffer.
+ */
+void memstick_init_req(struct memstick_request *mrq, unsigned char tpc,
+ void *buf, size_t length)
+{
+ mrq->tpc = tpc;
+ if (tpc & 8)
+ mrq->data_dir = WRITE;
+ else
+ mrq->data_dir = READ;
+
+ mrq->data_len = length > sizeof(mrq->data) ? sizeof(mrq->data) : length;
+ if (mrq->data_dir == WRITE)
+ memcpy(mrq->data, buf, mrq->data_len);
+
+ mrq->io_type = MEMSTICK_IO_VAL;
+
+ if (tpc == MS_TPC_SET_CMD || tpc == MS_TPC_EX_SET_CMD)
+ mrq->need_card_int = 1;
+ else
+ mrq->need_card_int = 0;
+
+ mrq->get_int_reg = 0;
+}
+EXPORT_SYMBOL(memstick_init_req);
+
+/*
+ * Functions prefixed with "h_" are protocol callbacks. They can be called from
+ * interrupt context. Return value of 0 means that request processing is still
+ * ongoing, while special error value of -EAGAIN means that current request is
+ * finished (and request processor should come back some time later).
+ */
+
+static int h_memstick_read_dev_id(struct memstick_dev *card,
+ struct memstick_request **mrq)
+{
+ struct ms_id_register id_reg;
+
+ if (!(*mrq)) {
+ memstick_init_req(&card->current_mrq, MS_TPC_READ_REG, NULL,
+ sizeof(struct ms_id_register));
+ *mrq = &card->current_mrq;
+ return 0;
+ } else {
+ if (!(*mrq)->error) {
+ memcpy(&id_reg, (*mrq)->data, sizeof(id_reg));
+ card->id.match_flags = MEMSTICK_MATCH_ALL;
+ card->id.type = id_reg.type;
+ card->id.category = id_reg.category;
+ card->id.class = id_reg.class;
+ }
+ complete(&card->mrq_complete);
+ return -EAGAIN;
+ }
+}
+
+static int h_memstick_set_rw_addr(struct memstick_dev *card,
+ struct memstick_request **mrq)
+{
+ if (!(*mrq)) {
+ memstick_init_req(&card->current_mrq, MS_TPC_SET_RW_REG_ADRS,
+ (char *)&card->reg_addr,
+ sizeof(card->reg_addr));
+ *mrq = &card->current_mrq;
+ return 0;
+ } else {
+ complete(&card->mrq_complete);
+ return -EAGAIN;
+ }
+}
+
+/**
+ * memstick_set_rw_addr - issue SET_RW_REG_ADDR request and wait for it to
+ * complete
+ * @card - media device to use
+ */
+int memstick_set_rw_addr(struct memstick_dev *card)
+{
+ card->next_request = h_memstick_set_rw_addr;
+ memstick_new_req(card->host);
+ wait_for_completion(&card->mrq_complete);
+
+ return card->current_mrq.error;
+}
+EXPORT_SYMBOL(memstick_set_rw_addr);
+
+static struct memstick_dev *memstick_alloc_card(struct memstick_host *host)
+{
+ struct memstick_dev *card = kzalloc(sizeof(struct memstick_dev),
+ GFP_KERNEL);
+ struct memstick_dev *old_card = host->card;
+ struct ms_id_register id_reg;
+
+ if (card) {
+ card->host = host;
+ snprintf(card->dev.bus_id, sizeof(card->dev.bus_id),
+ "%s", host->cdev.class_id);
+ card->dev.parent = host->cdev.dev;
+ card->dev.bus = &memstick_bus_type;
+ card->dev.release = memstick_free_card;
+ card->check = memstick_dummy_check;
+
+ card->reg_addr.r_offset = offsetof(struct ms_register, id);
+ card->reg_addr.r_length = sizeof(id_reg);
+ card->reg_addr.w_offset = offsetof(struct ms_register, id);
+ card->reg_addr.w_length = sizeof(id_reg);
+
+ init_completion(&card->mrq_complete);
+
+ host->card = card;
+ if (memstick_set_rw_addr(card))
+ goto err_out;
+
+ card->next_request = h_memstick_read_dev_id;
+ memstick_new_req(host);
+ wait_for_completion(&card->mrq_complete);
+
+ if (card->current_mrq.error)
+ goto err_out;
+ }
+ host->card = old_card;
+ return card;
+err_out:
+ host->card = old_card;
+ kfree(card);
+ return NULL;
+}
+
+static void memstick_power_on(struct memstick_host *host)
+{
+ host->set_param(host, MEMSTICK_POWER, MEMSTICK_POWER_ON);
+ host->set_param(host, MEMSTICK_INTERFACE, MEMSTICK_SERIAL);
+ msleep(1);
+}
+
+static void memstick_check(struct work_struct *work)
+{
+ struct memstick_host *host = container_of(work, struct memstick_host,
+ media_checker);
+ struct memstick_dev *card;
+
+ dev_dbg(host->cdev.dev, "memstick_check started\n");
+ mutex_lock(&host->lock);
+ if (!host->card)
+ memstick_power_on(host);
+
+ card = memstick_alloc_card(host);
+
+ if (!card) {
+ if (host->card) {
+ device_unregister(&host->card->dev);
+ host->card = NULL;
+ }
+ } else {
+ dev_dbg(host->cdev.dev, "new card %02x, %02x, %02x\n",
+ card->id.type, card->id.category, card->id.class);
+ if (host->card) {
+ if (memstick_set_rw_addr(host->card)
+ || !memstick_dev_match(host->card, &card->id)
+ || !(host->card->check(host->card))) {
+ device_unregister(&host->card->dev);
+ host->card = NULL;
+ }
+ }
+
+ if (!host->card) {
+ host->card = card;
+ if (device_register(&card->dev)) {
+ kfree(host->card);
+ host->card = NULL;
+ }
+ } else
+ kfree(card);
+ }
+
+ if (!host->card)
+ host->set_param(host, MEMSTICK_POWER, MEMSTICK_POWER_OFF);
+
+ mutex_unlock(&host->lock);
+ dev_dbg(host->cdev.dev, "memstick_check finished\n");
+}
+
+/**
+ * memstick_alloc_host - allocate a memstick_host structure
+ * @extra: size of the user private data to allocate
+ * @dev: parent device of the host
+ */
+struct memstick_host *memstick_alloc_host(unsigned int extra,
+ struct device *dev)
+{
+ struct memstick_host *host;
+
+ host = kzalloc(sizeof(struct memstick_host) + extra, GFP_KERNEL);
+ if (host) {
+ mutex_init(&host->lock);
+ INIT_WORK(&host->media_checker, memstick_check);
+ host->cdev.class = &memstick_host_class;
+ host->cdev.dev = dev;
+ class_device_initialize(&host->cdev);
+ }
+ return host;
+}
+EXPORT_SYMBOL(memstick_alloc_host);
+
+/**
+ * memstick_add_host - start request processing on memstick host
+ * @host - host to use
+ */
+int memstick_add_host(struct memstick_host *host)
+{
+ int rc;
+
+ if (!idr_pre_get(&memstick_host_idr, GFP_KERNEL))
+ return -ENOMEM;
+
+ spin_lock(&memstick_host_lock);
+ rc = idr_get_new(&memstick_host_idr, host, &host->id);
+ spin_unlock(&memstick_host_lock);
+ if (rc)
+ return rc;
+
+ snprintf(host->cdev.class_id, BUS_ID_SIZE,
+ "memstick%u", host->id);
+
+ rc = class_device_add(&host->cdev);
+ if (rc) {
+ spin_lock(&memstick_host_lock);
+ idr_remove(&memstick_host_idr, host->id);
+ spin_unlock(&memstick_host_lock);
+ return rc;
+ }
+
+ host->set_param(host, MEMSTICK_POWER, MEMSTICK_POWER_OFF);
+ memstick_detect_change(host);
+ return 0;
+}
+EXPORT_SYMBOL(memstick_add_host);
+
+/**
+ * memstick_remove_host - stop request processing on memstick host
+ * @host - host to use
+ */
+void memstick_remove_host(struct memstick_host *host)
+{
+ flush_workqueue(workqueue);
+ mutex_lock(&host->lock);
+ if (host->card)
+ device_unregister(&host->card->dev);
+ host->card = NULL;
+ host->set_param(host, MEMSTICK_POWER, MEMSTICK_POWER_OFF);
+ mutex_unlock(&host->lock);
+
+ spin_lock(&memstick_host_lock);
+ idr_remove(&memstick_host_idr, host->id);
+ spin_unlock(&memstick_host_lock);
+ class_device_del(&host->cdev);
+}
+EXPORT_SYMBOL(memstick_remove_host);
+
+/**
+ * memstick_free_host - free memstick host
+ * @host - host to use
+ */
+void memstick_free_host(struct memstick_host *host)
+{
+ mutex_destroy(&host->lock);
+ class_device_put(&host->cdev);
+}
+EXPORT_SYMBOL(memstick_free_host);
+
+int memstick_register_driver(struct memstick_driver *drv)
+{
+ drv->driver.bus = &memstick_bus_type;
+
+ return driver_register(&drv->driver);
+}
+EXPORT_SYMBOL(memstick_register_driver);
+
+void memstick_unregister_driver(struct memstick_driver *drv)
+{
+ driver_unregister(&drv->driver);
+}
+EXPORT_SYMBOL(memstick_unregister_driver);
+
+
+static int __init memstick_init(void)
+{
+ int rc;
+
+ workqueue = create_freezeable_workqueue("kmemstick");
+ if (!workqueue)
+ return -ENOMEM;
+
+ rc = bus_register(&memstick_bus_type);
+ if (!rc)
+ rc = class_register(&memstick_host_class);
+
+ if (!rc)
+ return 0;
+
+ bus_unregister(&memstick_bus_type);
+ destroy_workqueue(workqueue);
+
+ return rc;
+}
+
+static void __exit memstick_exit(void)
+{
+ class_unregister(&memstick_host_class);
+ bus_unregister(&memstick_bus_type);
+ destroy_workqueue(workqueue);
+ idr_destroy(&memstick_host_idr);
+}
+
+module_init(memstick_init);
+module_exit(memstick_exit);
+
+MODULE_AUTHOR("Alex Dubov");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("Sony MemoryStick core driver");
+MODULE_VERSION(DRIVER_VERSION);
git.openpandora.org / pandora-kernel.git / blobdiff