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864 lines
19 KiB
864 lines
19 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* Driver for the Diolan DLN-2 USB adapter |
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* |
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* Copyright (c) 2014 Intel Corporation |
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* |
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* Derived from: |
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* i2c-diolan-u2c.c |
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* Copyright (c) 2010-2011 Ericsson AB |
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*/ |
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|
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#include <linux/kernel.h> |
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#include <linux/module.h> |
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#include <linux/types.h> |
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#include <linux/slab.h> |
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#include <linux/usb.h> |
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#include <linux/i2c.h> |
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#include <linux/mutex.h> |
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#include <linux/platform_device.h> |
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#include <linux/mfd/core.h> |
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#include <linux/mfd/dln2.h> |
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#include <linux/rculist.h> |
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struct dln2_header { |
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__le16 size; |
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__le16 id; |
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__le16 echo; |
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__le16 handle; |
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}; |
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struct dln2_response { |
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struct dln2_header hdr; |
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__le16 result; |
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}; |
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#define DLN2_GENERIC_MODULE_ID 0x00 |
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#define DLN2_GENERIC_CMD(cmd) DLN2_CMD(cmd, DLN2_GENERIC_MODULE_ID) |
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#define CMD_GET_DEVICE_VER DLN2_GENERIC_CMD(0x30) |
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#define CMD_GET_DEVICE_SN DLN2_GENERIC_CMD(0x31) |
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#define DLN2_HW_ID 0x200 |
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#define DLN2_USB_TIMEOUT 200 /* in ms */ |
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#define DLN2_MAX_RX_SLOTS 16 |
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#define DLN2_MAX_URBS 16 |
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#define DLN2_RX_BUF_SIZE 512 |
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enum dln2_handle { |
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DLN2_HANDLE_EVENT = 0, /* don't change, hardware defined */ |
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DLN2_HANDLE_CTRL, |
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DLN2_HANDLE_GPIO, |
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DLN2_HANDLE_I2C, |
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DLN2_HANDLE_SPI, |
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DLN2_HANDLES |
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}; |
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/* |
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* Receive context used between the receive demultiplexer and the transfer |
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* routine. While sending a request the transfer routine will look for a free |
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* receive context and use it to wait for a response and to receive the URB and |
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* thus the response data. |
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*/ |
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struct dln2_rx_context { |
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/* completion used to wait for a response */ |
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struct completion done; |
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/* if non-NULL the URB contains the response */ |
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struct urb *urb; |
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/* if true then this context is used to wait for a response */ |
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bool in_use; |
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}; |
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/* |
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* Receive contexts for a particular DLN2 module (i2c, gpio, etc.). We use the |
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* handle header field to identify the module in dln2_dev.mod_rx_slots and then |
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* the echo header field to index the slots field and find the receive context |
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* for a particular request. |
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*/ |
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struct dln2_mod_rx_slots { |
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/* RX slots bitmap */ |
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DECLARE_BITMAP(bmap, DLN2_MAX_RX_SLOTS); |
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/* used to wait for a free RX slot */ |
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wait_queue_head_t wq; |
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/* used to wait for an RX operation to complete */ |
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struct dln2_rx_context slots[DLN2_MAX_RX_SLOTS]; |
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/* avoid races between alloc/free_rx_slot and dln2_rx_transfer */ |
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spinlock_t lock; |
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}; |
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enum dln2_endpoint { |
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DLN2_EP_OUT = 0, |
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DLN2_EP_IN = 1, |
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}; |
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struct dln2_dev { |
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struct usb_device *usb_dev; |
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struct usb_interface *interface; |
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u8 ep_in; |
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u8 ep_out; |
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struct urb *rx_urb[DLN2_MAX_URBS]; |
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void *rx_buf[DLN2_MAX_URBS]; |
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struct dln2_mod_rx_slots mod_rx_slots[DLN2_HANDLES]; |
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struct list_head event_cb_list; |
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spinlock_t event_cb_lock; |
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bool disconnect; |
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int active_transfers; |
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wait_queue_head_t disconnect_wq; |
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spinlock_t disconnect_lock; |
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}; |
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struct dln2_event_cb_entry { |
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struct list_head list; |
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u16 id; |
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struct platform_device *pdev; |
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dln2_event_cb_t callback; |
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}; |
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int dln2_register_event_cb(struct platform_device *pdev, u16 id, |
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dln2_event_cb_t event_cb) |
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{ |
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struct dln2_dev *dln2 = dev_get_drvdata(pdev->dev.parent); |
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struct dln2_event_cb_entry *i, *entry; |
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unsigned long flags; |
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int ret = 0; |
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entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
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if (!entry) |
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return -ENOMEM; |
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entry->id = id; |
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entry->callback = event_cb; |
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entry->pdev = pdev; |
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spin_lock_irqsave(&dln2->event_cb_lock, flags); |
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list_for_each_entry(i, &dln2->event_cb_list, list) { |
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if (i->id == id) { |
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ret = -EBUSY; |
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break; |
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} |
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} |
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if (!ret) |
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list_add_rcu(&entry->list, &dln2->event_cb_list); |
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spin_unlock_irqrestore(&dln2->event_cb_lock, flags); |
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if (ret) |
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kfree(entry); |
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return ret; |
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} |
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EXPORT_SYMBOL(dln2_register_event_cb); |
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void dln2_unregister_event_cb(struct platform_device *pdev, u16 id) |
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{ |
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struct dln2_dev *dln2 = dev_get_drvdata(pdev->dev.parent); |
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struct dln2_event_cb_entry *i; |
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unsigned long flags; |
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bool found = false; |
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spin_lock_irqsave(&dln2->event_cb_lock, flags); |
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list_for_each_entry(i, &dln2->event_cb_list, list) { |
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if (i->id == id) { |
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list_del_rcu(&i->list); |
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found = true; |
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break; |
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} |
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} |
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spin_unlock_irqrestore(&dln2->event_cb_lock, flags); |
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if (found) { |
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synchronize_rcu(); |
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kfree(i); |
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} |
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} |
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EXPORT_SYMBOL(dln2_unregister_event_cb); |
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/* |
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* Returns true if a valid transfer slot is found. In this case the URB must not |
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* be resubmitted immediately in dln2_rx as we need the data when dln2_transfer |
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* is woke up. It will be resubmitted there. |
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*/ |
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static bool dln2_transfer_complete(struct dln2_dev *dln2, struct urb *urb, |
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u16 handle, u16 rx_slot) |
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{ |
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struct device *dev = &dln2->interface->dev; |
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struct dln2_mod_rx_slots *rxs = &dln2->mod_rx_slots[handle]; |
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struct dln2_rx_context *rxc; |
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unsigned long flags; |
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bool valid_slot = false; |
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if (rx_slot >= DLN2_MAX_RX_SLOTS) |
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goto out; |
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rxc = &rxs->slots[rx_slot]; |
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spin_lock_irqsave(&rxs->lock, flags); |
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if (rxc->in_use && !rxc->urb) { |
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rxc->urb = urb; |
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complete(&rxc->done); |
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valid_slot = true; |
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} |
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spin_unlock_irqrestore(&rxs->lock, flags); |
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out: |
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if (!valid_slot) |
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dev_warn(dev, "bad/late response %d/%d\n", handle, rx_slot); |
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return valid_slot; |
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} |
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static void dln2_run_event_callbacks(struct dln2_dev *dln2, u16 id, u16 echo, |
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void *data, int len) |
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{ |
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struct dln2_event_cb_entry *i; |
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rcu_read_lock(); |
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list_for_each_entry_rcu(i, &dln2->event_cb_list, list) { |
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if (i->id == id) { |
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i->callback(i->pdev, echo, data, len); |
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break; |
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} |
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} |
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rcu_read_unlock(); |
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} |
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static void dln2_rx(struct urb *urb) |
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{ |
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struct dln2_dev *dln2 = urb->context; |
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struct dln2_header *hdr = urb->transfer_buffer; |
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struct device *dev = &dln2->interface->dev; |
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u16 id, echo, handle, size; |
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u8 *data; |
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int len; |
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int err; |
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switch (urb->status) { |
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case 0: |
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/* success */ |
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break; |
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case -ECONNRESET: |
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case -ENOENT: |
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case -ESHUTDOWN: |
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case -EPIPE: |
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/* this urb is terminated, clean up */ |
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dev_dbg(dev, "urb shutting down with status %d\n", urb->status); |
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return; |
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default: |
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dev_dbg(dev, "nonzero urb status received %d\n", urb->status); |
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goto out; |
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} |
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if (urb->actual_length < sizeof(struct dln2_header)) { |
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dev_err(dev, "short response: %d\n", urb->actual_length); |
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goto out; |
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} |
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handle = le16_to_cpu(hdr->handle); |
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id = le16_to_cpu(hdr->id); |
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echo = le16_to_cpu(hdr->echo); |
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size = le16_to_cpu(hdr->size); |
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if (size != urb->actual_length) { |
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dev_err(dev, "size mismatch: handle %x cmd %x echo %x size %d actual %d\n", |
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handle, id, echo, size, urb->actual_length); |
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goto out; |
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} |
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if (handle >= DLN2_HANDLES) { |
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dev_warn(dev, "invalid handle %d\n", handle); |
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goto out; |
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} |
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data = urb->transfer_buffer + sizeof(struct dln2_header); |
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len = urb->actual_length - sizeof(struct dln2_header); |
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if (handle == DLN2_HANDLE_EVENT) { |
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unsigned long flags; |
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spin_lock_irqsave(&dln2->event_cb_lock, flags); |
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dln2_run_event_callbacks(dln2, id, echo, data, len); |
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spin_unlock_irqrestore(&dln2->event_cb_lock, flags); |
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} else { |
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/* URB will be re-submitted in _dln2_transfer (free_rx_slot) */ |
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if (dln2_transfer_complete(dln2, urb, handle, echo)) |
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return; |
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} |
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out: |
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err = usb_submit_urb(urb, GFP_ATOMIC); |
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if (err < 0) |
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dev_err(dev, "failed to resubmit RX URB: %d\n", err); |
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} |
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static void *dln2_prep_buf(u16 handle, u16 cmd, u16 echo, const void *obuf, |
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int *obuf_len, gfp_t gfp) |
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{ |
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int len; |
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void *buf; |
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struct dln2_header *hdr; |
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len = *obuf_len + sizeof(*hdr); |
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buf = kmalloc(len, gfp); |
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if (!buf) |
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return NULL; |
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hdr = (struct dln2_header *)buf; |
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hdr->id = cpu_to_le16(cmd); |
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hdr->size = cpu_to_le16(len); |
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hdr->echo = cpu_to_le16(echo); |
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hdr->handle = cpu_to_le16(handle); |
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memcpy(buf + sizeof(*hdr), obuf, *obuf_len); |
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*obuf_len = len; |
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return buf; |
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} |
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static int dln2_send_wait(struct dln2_dev *dln2, u16 handle, u16 cmd, u16 echo, |
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const void *obuf, int obuf_len) |
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{ |
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int ret = 0; |
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int len = obuf_len; |
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void *buf; |
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int actual; |
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buf = dln2_prep_buf(handle, cmd, echo, obuf, &len, GFP_KERNEL); |
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if (!buf) |
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return -ENOMEM; |
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ret = usb_bulk_msg(dln2->usb_dev, |
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usb_sndbulkpipe(dln2->usb_dev, dln2->ep_out), |
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buf, len, &actual, DLN2_USB_TIMEOUT); |
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kfree(buf); |
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return ret; |
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} |
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static bool find_free_slot(struct dln2_dev *dln2, u16 handle, int *slot) |
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{ |
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struct dln2_mod_rx_slots *rxs; |
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unsigned long flags; |
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if (dln2->disconnect) { |
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*slot = -ENODEV; |
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return true; |
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} |
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rxs = &dln2->mod_rx_slots[handle]; |
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spin_lock_irqsave(&rxs->lock, flags); |
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*slot = find_first_zero_bit(rxs->bmap, DLN2_MAX_RX_SLOTS); |
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if (*slot < DLN2_MAX_RX_SLOTS) { |
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struct dln2_rx_context *rxc = &rxs->slots[*slot]; |
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set_bit(*slot, rxs->bmap); |
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rxc->in_use = true; |
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} |
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spin_unlock_irqrestore(&rxs->lock, flags); |
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return *slot < DLN2_MAX_RX_SLOTS; |
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} |
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static int alloc_rx_slot(struct dln2_dev *dln2, u16 handle) |
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{ |
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int ret; |
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int slot; |
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/* |
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* No need to timeout here, the wait is bounded by the timeout in |
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* _dln2_transfer. |
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*/ |
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ret = wait_event_interruptible(dln2->mod_rx_slots[handle].wq, |
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find_free_slot(dln2, handle, &slot)); |
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if (ret < 0) |
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return ret; |
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return slot; |
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} |
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static void free_rx_slot(struct dln2_dev *dln2, u16 handle, int slot) |
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{ |
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struct dln2_mod_rx_slots *rxs; |
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struct urb *urb = NULL; |
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unsigned long flags; |
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struct dln2_rx_context *rxc; |
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rxs = &dln2->mod_rx_slots[handle]; |
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spin_lock_irqsave(&rxs->lock, flags); |
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clear_bit(slot, rxs->bmap); |
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rxc = &rxs->slots[slot]; |
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rxc->in_use = false; |
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urb = rxc->urb; |
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rxc->urb = NULL; |
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reinit_completion(&rxc->done); |
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spin_unlock_irqrestore(&rxs->lock, flags); |
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if (urb) { |
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int err; |
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struct device *dev = &dln2->interface->dev; |
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err = usb_submit_urb(urb, GFP_KERNEL); |
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if (err < 0) |
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dev_err(dev, "failed to resubmit RX URB: %d\n", err); |
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} |
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wake_up_interruptible(&rxs->wq); |
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} |
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static int _dln2_transfer(struct dln2_dev *dln2, u16 handle, u16 cmd, |
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const void *obuf, unsigned obuf_len, |
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void *ibuf, unsigned *ibuf_len) |
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{ |
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int ret = 0; |
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int rx_slot; |
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struct dln2_response *rsp; |
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struct dln2_rx_context *rxc; |
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struct device *dev = &dln2->interface->dev; |
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const unsigned long timeout = msecs_to_jiffies(DLN2_USB_TIMEOUT); |
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struct dln2_mod_rx_slots *rxs = &dln2->mod_rx_slots[handle]; |
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int size; |
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spin_lock(&dln2->disconnect_lock); |
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if (!dln2->disconnect) |
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dln2->active_transfers++; |
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else |
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ret = -ENODEV; |
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spin_unlock(&dln2->disconnect_lock); |
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if (ret) |
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return ret; |
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rx_slot = alloc_rx_slot(dln2, handle); |
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if (rx_slot < 0) { |
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ret = rx_slot; |
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goto out_decr; |
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} |
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ret = dln2_send_wait(dln2, handle, cmd, rx_slot, obuf, obuf_len); |
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if (ret < 0) { |
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dev_err(dev, "USB write failed: %d\n", ret); |
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goto out_free_rx_slot; |
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} |
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rxc = &rxs->slots[rx_slot]; |
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ret = wait_for_completion_interruptible_timeout(&rxc->done, timeout); |
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if (ret <= 0) { |
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if (!ret) |
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ret = -ETIMEDOUT; |
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goto out_free_rx_slot; |
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} else { |
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ret = 0; |
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} |
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if (dln2->disconnect) { |
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ret = -ENODEV; |
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goto out_free_rx_slot; |
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} |
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/* if we got here we know that the response header has been checked */ |
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rsp = rxc->urb->transfer_buffer; |
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size = le16_to_cpu(rsp->hdr.size); |
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if (size < sizeof(*rsp)) { |
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ret = -EPROTO; |
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goto out_free_rx_slot; |
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} |
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if (le16_to_cpu(rsp->result) > 0x80) { |
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dev_dbg(dev, "%d received response with error %d\n", |
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handle, le16_to_cpu(rsp->result)); |
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ret = -EREMOTEIO; |
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goto out_free_rx_slot; |
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} |
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if (!ibuf) |
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goto out_free_rx_slot; |
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if (*ibuf_len > size - sizeof(*rsp)) |
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*ibuf_len = size - sizeof(*rsp); |
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memcpy(ibuf, rsp + 1, *ibuf_len); |
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out_free_rx_slot: |
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free_rx_slot(dln2, handle, rx_slot); |
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out_decr: |
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spin_lock(&dln2->disconnect_lock); |
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dln2->active_transfers--; |
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spin_unlock(&dln2->disconnect_lock); |
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if (dln2->disconnect) |
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wake_up(&dln2->disconnect_wq); |
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return ret; |
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} |
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int dln2_transfer(struct platform_device *pdev, u16 cmd, |
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const void *obuf, unsigned obuf_len, |
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void *ibuf, unsigned *ibuf_len) |
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{ |
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struct dln2_platform_data *dln2_pdata; |
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struct dln2_dev *dln2; |
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u16 handle; |
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dln2 = dev_get_drvdata(pdev->dev.parent); |
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dln2_pdata = dev_get_platdata(&pdev->dev); |
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handle = dln2_pdata->handle; |
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return _dln2_transfer(dln2, handle, cmd, obuf, obuf_len, ibuf, |
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ibuf_len); |
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} |
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EXPORT_SYMBOL(dln2_transfer); |
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static int dln2_check_hw(struct dln2_dev *dln2) |
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{ |
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int ret; |
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__le32 hw_type; |
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int len = sizeof(hw_type); |
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ret = _dln2_transfer(dln2, DLN2_HANDLE_CTRL, CMD_GET_DEVICE_VER, |
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NULL, 0, &hw_type, &len); |
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if (ret < 0) |
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return ret; |
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if (len < sizeof(hw_type)) |
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return -EREMOTEIO; |
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if (le32_to_cpu(hw_type) != DLN2_HW_ID) { |
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dev_err(&dln2->interface->dev, "Device ID 0x%x not supported\n", |
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le32_to_cpu(hw_type)); |
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return -ENODEV; |
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} |
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return 0; |
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} |
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static int dln2_print_serialno(struct dln2_dev *dln2) |
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{ |
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int ret; |
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__le32 serial_no; |
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int len = sizeof(serial_no); |
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struct device *dev = &dln2->interface->dev; |
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ret = _dln2_transfer(dln2, DLN2_HANDLE_CTRL, CMD_GET_DEVICE_SN, NULL, 0, |
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&serial_no, &len); |
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if (ret < 0) |
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return ret; |
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if (len < sizeof(serial_no)) |
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return -EREMOTEIO; |
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dev_info(dev, "Diolan DLN2 serial %u\n", le32_to_cpu(serial_no)); |
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return 0; |
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} |
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static int dln2_hw_init(struct dln2_dev *dln2) |
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{ |
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int ret; |
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ret = dln2_check_hw(dln2); |
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if (ret < 0) |
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return ret; |
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return dln2_print_serialno(dln2); |
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} |
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|
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static void dln2_free_rx_urbs(struct dln2_dev *dln2) |
|
{ |
|
int i; |
|
|
|
for (i = 0; i < DLN2_MAX_URBS; i++) { |
|
usb_free_urb(dln2->rx_urb[i]); |
|
kfree(dln2->rx_buf[i]); |
|
} |
|
} |
|
|
|
static void dln2_stop_rx_urbs(struct dln2_dev *dln2) |
|
{ |
|
int i; |
|
|
|
for (i = 0; i < DLN2_MAX_URBS; i++) |
|
usb_kill_urb(dln2->rx_urb[i]); |
|
} |
|
|
|
static void dln2_free(struct dln2_dev *dln2) |
|
{ |
|
dln2_free_rx_urbs(dln2); |
|
usb_put_dev(dln2->usb_dev); |
|
kfree(dln2); |
|
} |
|
|
|
static int dln2_setup_rx_urbs(struct dln2_dev *dln2, |
|
struct usb_host_interface *hostif) |
|
{ |
|
int i; |
|
const int rx_max_size = DLN2_RX_BUF_SIZE; |
|
|
|
for (i = 0; i < DLN2_MAX_URBS; i++) { |
|
dln2->rx_buf[i] = kmalloc(rx_max_size, GFP_KERNEL); |
|
if (!dln2->rx_buf[i]) |
|
return -ENOMEM; |
|
|
|
dln2->rx_urb[i] = usb_alloc_urb(0, GFP_KERNEL); |
|
if (!dln2->rx_urb[i]) |
|
return -ENOMEM; |
|
|
|
usb_fill_bulk_urb(dln2->rx_urb[i], dln2->usb_dev, |
|
usb_rcvbulkpipe(dln2->usb_dev, dln2->ep_in), |
|
dln2->rx_buf[i], rx_max_size, dln2_rx, dln2); |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int dln2_start_rx_urbs(struct dln2_dev *dln2, gfp_t gfp) |
|
{ |
|
struct device *dev = &dln2->interface->dev; |
|
int ret; |
|
int i; |
|
|
|
for (i = 0; i < DLN2_MAX_URBS; i++) { |
|
ret = usb_submit_urb(dln2->rx_urb[i], gfp); |
|
if (ret < 0) { |
|
dev_err(dev, "failed to submit RX URB: %d\n", ret); |
|
return ret; |
|
} |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
enum { |
|
DLN2_ACPI_MATCH_GPIO = 0, |
|
DLN2_ACPI_MATCH_I2C = 1, |
|
DLN2_ACPI_MATCH_SPI = 2, |
|
}; |
|
|
|
static struct dln2_platform_data dln2_pdata_gpio = { |
|
.handle = DLN2_HANDLE_GPIO, |
|
}; |
|
|
|
static struct mfd_cell_acpi_match dln2_acpi_match_gpio = { |
|
.adr = DLN2_ACPI_MATCH_GPIO, |
|
}; |
|
|
|
/* Only one I2C port seems to be supported on current hardware */ |
|
static struct dln2_platform_data dln2_pdata_i2c = { |
|
.handle = DLN2_HANDLE_I2C, |
|
.port = 0, |
|
}; |
|
|
|
static struct mfd_cell_acpi_match dln2_acpi_match_i2c = { |
|
.adr = DLN2_ACPI_MATCH_I2C, |
|
}; |
|
|
|
/* Only one SPI port supported */ |
|
static struct dln2_platform_data dln2_pdata_spi = { |
|
.handle = DLN2_HANDLE_SPI, |
|
.port = 0, |
|
}; |
|
|
|
static struct mfd_cell_acpi_match dln2_acpi_match_spi = { |
|
.adr = DLN2_ACPI_MATCH_SPI, |
|
}; |
|
|
|
static const struct mfd_cell dln2_devs[] = { |
|
{ |
|
.name = "dln2-gpio", |
|
.acpi_match = &dln2_acpi_match_gpio, |
|
.platform_data = &dln2_pdata_gpio, |
|
.pdata_size = sizeof(struct dln2_platform_data), |
|
}, |
|
{ |
|
.name = "dln2-i2c", |
|
.acpi_match = &dln2_acpi_match_i2c, |
|
.platform_data = &dln2_pdata_i2c, |
|
.pdata_size = sizeof(struct dln2_platform_data), |
|
}, |
|
{ |
|
.name = "dln2-spi", |
|
.acpi_match = &dln2_acpi_match_spi, |
|
.platform_data = &dln2_pdata_spi, |
|
.pdata_size = sizeof(struct dln2_platform_data), |
|
}, |
|
}; |
|
|
|
static void dln2_stop(struct dln2_dev *dln2) |
|
{ |
|
int i, j; |
|
|
|
/* don't allow starting new transfers */ |
|
spin_lock(&dln2->disconnect_lock); |
|
dln2->disconnect = true; |
|
spin_unlock(&dln2->disconnect_lock); |
|
|
|
/* cancel in progress transfers */ |
|
for (i = 0; i < DLN2_HANDLES; i++) { |
|
struct dln2_mod_rx_slots *rxs = &dln2->mod_rx_slots[i]; |
|
unsigned long flags; |
|
|
|
spin_lock_irqsave(&rxs->lock, flags); |
|
|
|
/* cancel all response waiters */ |
|
for (j = 0; j < DLN2_MAX_RX_SLOTS; j++) { |
|
struct dln2_rx_context *rxc = &rxs->slots[j]; |
|
|
|
if (rxc->in_use) |
|
complete(&rxc->done); |
|
} |
|
|
|
spin_unlock_irqrestore(&rxs->lock, flags); |
|
} |
|
|
|
/* wait for transfers to end */ |
|
wait_event(dln2->disconnect_wq, !dln2->active_transfers); |
|
|
|
dln2_stop_rx_urbs(dln2); |
|
} |
|
|
|
static void dln2_disconnect(struct usb_interface *interface) |
|
{ |
|
struct dln2_dev *dln2 = usb_get_intfdata(interface); |
|
|
|
dln2_stop(dln2); |
|
|
|
mfd_remove_devices(&interface->dev); |
|
|
|
dln2_free(dln2); |
|
} |
|
|
|
static int dln2_probe(struct usb_interface *interface, |
|
const struct usb_device_id *usb_id) |
|
{ |
|
struct usb_host_interface *hostif = interface->cur_altsetting; |
|
struct usb_endpoint_descriptor *epin; |
|
struct usb_endpoint_descriptor *epout; |
|
struct device *dev = &interface->dev; |
|
struct dln2_dev *dln2; |
|
int ret; |
|
int i, j; |
|
|
|
if (hostif->desc.bInterfaceNumber != 0 || |
|
hostif->desc.bNumEndpoints < 2) |
|
return -ENODEV; |
|
|
|
epout = &hostif->endpoint[DLN2_EP_OUT].desc; |
|
if (!usb_endpoint_is_bulk_out(epout)) |
|
return -ENODEV; |
|
epin = &hostif->endpoint[DLN2_EP_IN].desc; |
|
if (!usb_endpoint_is_bulk_in(epin)) |
|
return -ENODEV; |
|
|
|
dln2 = kzalloc(sizeof(*dln2), GFP_KERNEL); |
|
if (!dln2) |
|
return -ENOMEM; |
|
|
|
dln2->ep_out = epout->bEndpointAddress; |
|
dln2->ep_in = epin->bEndpointAddress; |
|
dln2->usb_dev = usb_get_dev(interface_to_usbdev(interface)); |
|
dln2->interface = interface; |
|
usb_set_intfdata(interface, dln2); |
|
init_waitqueue_head(&dln2->disconnect_wq); |
|
|
|
for (i = 0; i < DLN2_HANDLES; i++) { |
|
init_waitqueue_head(&dln2->mod_rx_slots[i].wq); |
|
spin_lock_init(&dln2->mod_rx_slots[i].lock); |
|
for (j = 0; j < DLN2_MAX_RX_SLOTS; j++) |
|
init_completion(&dln2->mod_rx_slots[i].slots[j].done); |
|
} |
|
|
|
spin_lock_init(&dln2->event_cb_lock); |
|
spin_lock_init(&dln2->disconnect_lock); |
|
INIT_LIST_HEAD(&dln2->event_cb_list); |
|
|
|
ret = dln2_setup_rx_urbs(dln2, hostif); |
|
if (ret) |
|
goto out_free; |
|
|
|
ret = dln2_start_rx_urbs(dln2, GFP_KERNEL); |
|
if (ret) |
|
goto out_stop_rx; |
|
|
|
ret = dln2_hw_init(dln2); |
|
if (ret < 0) { |
|
dev_err(dev, "failed to initialize hardware\n"); |
|
goto out_stop_rx; |
|
} |
|
|
|
ret = mfd_add_hotplug_devices(dev, dln2_devs, ARRAY_SIZE(dln2_devs)); |
|
if (ret != 0) { |
|
dev_err(dev, "failed to add mfd devices to core\n"); |
|
goto out_stop_rx; |
|
} |
|
|
|
return 0; |
|
|
|
out_stop_rx: |
|
dln2_stop_rx_urbs(dln2); |
|
|
|
out_free: |
|
dln2_free(dln2); |
|
|
|
return ret; |
|
} |
|
|
|
static int dln2_suspend(struct usb_interface *iface, pm_message_t message) |
|
{ |
|
struct dln2_dev *dln2 = usb_get_intfdata(iface); |
|
|
|
dln2_stop(dln2); |
|
|
|
return 0; |
|
} |
|
|
|
static int dln2_resume(struct usb_interface *iface) |
|
{ |
|
struct dln2_dev *dln2 = usb_get_intfdata(iface); |
|
|
|
dln2->disconnect = false; |
|
|
|
return dln2_start_rx_urbs(dln2, GFP_NOIO); |
|
} |
|
|
|
static const struct usb_device_id dln2_table[] = { |
|
{ USB_DEVICE(0xa257, 0x2013) }, |
|
{ } |
|
}; |
|
|
|
MODULE_DEVICE_TABLE(usb, dln2_table); |
|
|
|
static struct usb_driver dln2_driver = { |
|
.name = "dln2", |
|
.probe = dln2_probe, |
|
.disconnect = dln2_disconnect, |
|
.id_table = dln2_table, |
|
.suspend = dln2_suspend, |
|
.resume = dln2_resume, |
|
}; |
|
|
|
module_usb_driver(dln2_driver); |
|
|
|
MODULE_AUTHOR("Octavian Purdila <[email protected]>"); |
|
MODULE_DESCRIPTION("Core driver for the Diolan DLN2 interface adapter"); |
|
MODULE_LICENSE("GPL v2");
|
|
|