From 034dd340b08be1f2f0477ad16131d609f9dbd53c Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sun, 30 Aug 2026 09:22:00 -0700 Subject: Merge tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace Pull tracing fixes from Steven Rostedt: - Fix error output of boot instance creation failure Currently if a boot instance creation fails, instead of printing out the name of the instance that failed, it prints "(null)". That is because it prints "cur_str" that had already been processed by strsep(). Print the saved name instead. While at it, print the error code of the failure. - Fix use-after-free for same named historgrams Histograms can be named so that they can be used in multiple events. But if the named histogram has a variable attached, the second event that uses the named histogram which duplicates it and needs to free the original after duplication leaves the old variable in place and still visible. If another histogram uses than variable, it will use the stale one which will try to reference the freed duplicate histogram and crash the kernel. Free the duplicate variables along with the duplicated histogram data. - Check return value of kthread_run() in event self test The events self tests uses a kthread for testing but does not check if it succeeded in creating a kthread. If the kthread creation were to fail, the code will still try to call kthread_stop() on the error returned. - Fix race between reading trace_pipe and updating subbuffer size If a user is reading the trace_pipe file at the same time they update the ring buffer sub-buffer size, can cause the trace_pipe read to read stale data. Add trace_access_lock() around updating the ring buffer sub-buffer size. - Fix eventfs_inode on failure path in creation of the events directory In the creation of the "events" directory, if after allocating the eventfs_inode a failure is detected, it calls cleanup_ei() which calls free_ei(). The free_ei() will test if eventfs_inode being freed has no children. It is a bug if it does. But on the failure case of the creation of the "events" directory, the children lists have not yet been initialized and the free will trigger a warning because list_empty() on an uninitialized list returns false. Move the initialization into init_ei() where it makes more sense and makes sure that a created eventfs_inode has its lists initialized upon creation. - Check return value of kthread_run() in ftrace direct sample code The sample code that shows how to use the ftrace direct calls does not test the return of kthread_run() to see if it succeeds. Return a failure if the kthread_run() doesn't succeed. - Clear user events state on fork in case of alloc failure On fork, the child gets a pointer to the parent's user events state. It makes a copy of it then updates the child's pointer to it. But if the allocation fails, the duplication function leaves the child with a pointer to its parent's descriptor. When the child cleans up its data, it will free the parent's descriptor while the parent is still using it. In the duplication function, set the child's user_event_mm to NULL before testing if the allocation succeeded, and when it exits it will not free the parent's descriptor. - Fix retry exhaustion in simple ring buffer reader swap simple_ring_buffer_swap_reader_page() starts with retry set to 8 and post-decrements it only after a failed link replacement. On the final attempt, a successful replacement leaves retry at zero, while a failed replacement leaves it at -1. But the check for success expects the retry value to be non-zero and exits with an error on zero. This is the opposite result. Fix it. - Fail nicely when the remote swap_reader_page() returns an error Currently, if the swap_reader_page() of a remote buffer fails, it triggers a WARN_ON_ONCE() and continues normally. Instead, have it exit with an error and a pr_warn() print instead of a full WARNING. * tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace: ring-buffer: Stop remote reader update when page swap fails tracing: Fix retry exhaustion in simple ring buffer reader swap tracing/user_events: Clear copied tracing state before fork duplication samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-multi-modify samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-modify eventfs: Initialize ei->children and ei->list in init_ei() tracing: Fix use-after-free in trace_pipe read on sub-buffer order change tracing: Fix crash passing ERR_PTR to kthread_stop() tracing: Fix use-after-free with same-name named triggers tracing: Fix logged instance name on creation failure --- drivers/mfd/dln2.c | 869 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 869 insertions(+) create mode 100644 drivers/mfd/dln2.c (limited to 'drivers/mfd/dln2.c') diff --git a/drivers/mfd/dln2.c b/drivers/mfd/dln2.c new file mode 100644 index 000000000..0b1e7fd7f --- /dev/null +++ b/drivers/mfd/dln2.c @@ -0,0 +1,869 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Driver for the Diolan DLN-2 USB adapter + * + * Copyright (c) 2014 Intel Corporation + * + * Derived from: + * i2c-diolan-u2c.c + * Copyright (c) 2010-2011 Ericsson AB + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +struct dln2_header { + __le16 size; + __le16 id; + __le16 echo; + __le16 handle; +}; + +struct dln2_response { + struct dln2_header hdr; + __le16 result; +}; + +#define DLN2_GENERIC_MODULE_ID 0x00 +#define DLN2_GENERIC_CMD(cmd) DLN2_CMD(cmd, DLN2_GENERIC_MODULE_ID) +#define CMD_GET_DEVICE_VER DLN2_GENERIC_CMD(0x30) +#define CMD_GET_DEVICE_SN DLN2_GENERIC_CMD(0x31) + +#define DLN2_HW_ID 0x200 +#define DLN2_USB_TIMEOUT 200 /* in ms */ +#define DLN2_MAX_RX_SLOTS 16 +#define DLN2_MAX_URBS 16 +#define DLN2_RX_BUF_SIZE 512 + +enum dln2_handle { + DLN2_HANDLE_EVENT = 0, /* don't change, hardware defined */ + DLN2_HANDLE_CTRL, + DLN2_HANDLE_GPIO, + DLN2_HANDLE_I2C, + DLN2_HANDLE_SPI, + DLN2_HANDLE_ADC, + DLN2_HANDLES +}; + +/* + * Receive context used between the receive demultiplexer and the transfer + * routine. While sending a request the transfer routine will look for a free + * receive context and use it to wait for a response and to receive the URB and + * thus the response data. + */ +struct dln2_rx_context { + /* completion used to wait for a response */ + struct completion done; + + /* if non-NULL the URB contains the response */ + struct urb *urb; + + /* if true then this context is used to wait for a response */ + bool in_use; +}; + +/* + * Receive contexts for a particular DLN2 module (i2c, gpio, etc.). We use the + * handle header field to identify the module in dln2_dev.mod_rx_slots and then + * the echo header field to index the slots field and find the receive context + * for a particular request. + */ +struct dln2_mod_rx_slots { + /* RX slots bitmap */ + DECLARE_BITMAP(bmap, DLN2_MAX_RX_SLOTS); + + /* used to wait for a free RX slot */ + wait_queue_head_t wq; + + /* used to wait for an RX operation to complete */ + struct dln2_rx_context slots[DLN2_MAX_RX_SLOTS]; + + /* avoid races between alloc/free_rx_slot and dln2_rx_transfer */ + spinlock_t lock; +}; + +struct dln2_dev { + struct usb_device *usb_dev; + struct usb_interface *interface; + u8 ep_in; + u8 ep_out; + + struct urb *rx_urb[DLN2_MAX_URBS]; + void *rx_buf[DLN2_MAX_URBS]; + + struct dln2_mod_rx_slots mod_rx_slots[DLN2_HANDLES]; + + struct list_head event_cb_list; + spinlock_t event_cb_lock; + + bool disconnect; + int active_transfers; + wait_queue_head_t disconnect_wq; + spinlock_t disconnect_lock; +}; + +struct dln2_event_cb_entry { + struct list_head list; + u16 id; + struct platform_device *pdev; + dln2_event_cb_t callback; +}; + +int dln2_register_event_cb(struct platform_device *pdev, u16 id, + dln2_event_cb_t event_cb) +{ + struct dln2_dev *dln2 = dev_get_drvdata(pdev->dev.parent); + struct dln2_event_cb_entry *i, *entry; + unsigned long flags; + int ret = 0; + + entry = kzalloc_obj(*entry); + if (!entry) + return -ENOMEM; + + entry->id = id; + entry->callback = event_cb; + entry->pdev = pdev; + + spin_lock_irqsave(&dln2->event_cb_lock, flags); + + list_for_each_entry(i, &dln2->event_cb_list, list) { + if (i->id == id) { + ret = -EBUSY; + break; + } + } + + if (!ret) + list_add_rcu(&entry->list, &dln2->event_cb_list); + + spin_unlock_irqrestore(&dln2->event_cb_lock, flags); + + if (ret) + kfree(entry); + + return ret; +} +EXPORT_SYMBOL(dln2_register_event_cb); + +void dln2_unregister_event_cb(struct platform_device *pdev, u16 id) +{ + struct dln2_dev *dln2 = dev_get_drvdata(pdev->dev.parent); + struct dln2_event_cb_entry *i; + unsigned long flags; + bool found = false; + + spin_lock_irqsave(&dln2->event_cb_lock, flags); + + list_for_each_entry(i, &dln2->event_cb_list, list) { + if (i->id == id) { + list_del_rcu(&i->list); + found = true; + break; + } + } + + spin_unlock_irqrestore(&dln2->event_cb_lock, flags); + + if (found) { + synchronize_rcu(); + kfree(i); + } +} +EXPORT_SYMBOL(dln2_unregister_event_cb); + +/* + * Returns true if a valid transfer slot is found. In this case the URB must not + * be resubmitted immediately in dln2_rx as we need the data when dln2_transfer + * is woke up. It will be resubmitted there. + */ +static bool dln2_transfer_complete(struct dln2_dev *dln2, struct urb *urb, + u16 handle, u16 rx_slot) +{ + struct device *dev = &dln2->interface->dev; + struct dln2_mod_rx_slots *rxs = &dln2->mod_rx_slots[handle]; + struct dln2_rx_context *rxc; + unsigned long flags; + bool valid_slot = false; + + if (rx_slot >= DLN2_MAX_RX_SLOTS) + goto out; + + rxc = &rxs->slots[rx_slot]; + + spin_lock_irqsave(&rxs->lock, flags); + if (rxc->in_use && !rxc->urb) { + rxc->urb = urb; + complete(&rxc->done); + valid_slot = true; + } + spin_unlock_irqrestore(&rxs->lock, flags); + +out: + if (!valid_slot) + dev_warn(dev, "bad/late response %d/%d\n", handle, rx_slot); + + return valid_slot; +} + +static void dln2_run_event_callbacks(struct dln2_dev *dln2, u16 id, u16 echo, + void *data, int len) +{ + struct dln2_event_cb_entry *i; + + rcu_read_lock(); + + list_for_each_entry_rcu(i, &dln2->event_cb_list, list) { + if (i->id == id) { + i->callback(i->pdev, echo, data, len); + break; + } + } + + rcu_read_unlock(); +} + +static void dln2_rx(struct urb *urb) +{ + struct dln2_dev *dln2 = urb->context; + struct dln2_header *hdr = urb->transfer_buffer; + struct device *dev = &dln2->interface->dev; + u16 id, echo, handle, size; + u8 *data; + int len; + int err; + + switch (urb->status) { + case 0: + /* success */ + break; + case -ECONNRESET: + case -ENOENT: + case -ESHUTDOWN: + case -EPIPE: + /* this urb is terminated, clean up */ + dev_dbg(dev, "urb shutting down with status %d\n", urb->status); + return; + default: + dev_dbg(dev, "nonzero urb status received %d\n", urb->status); + goto out; + } + + if (urb->actual_length < sizeof(struct dln2_header)) { + dev_err(dev, "short response: %d\n", urb->actual_length); + goto out; + } + + handle = le16_to_cpu(hdr->handle); + id = le16_to_cpu(hdr->id); + echo = le16_to_cpu(hdr->echo); + size = le16_to_cpu(hdr->size); + + if (size != urb->actual_length) { + dev_err(dev, "size mismatch: handle %x cmd %x echo %x size %d actual %d\n", + handle, id, echo, size, urb->actual_length); + goto out; + } + + if (handle >= DLN2_HANDLES) { + dev_warn(dev, "invalid handle %d\n", handle); + goto out; + } + + data = urb->transfer_buffer + sizeof(struct dln2_header); + len = urb->actual_length - sizeof(struct dln2_header); + + if (handle == DLN2_HANDLE_EVENT) { + unsigned long flags; + + spin_lock_irqsave(&dln2->event_cb_lock, flags); + dln2_run_event_callbacks(dln2, id, echo, data, len); + spin_unlock_irqrestore(&dln2->event_cb_lock, flags); + } else { + /* URB will be re-submitted in _dln2_transfer (free_rx_slot) */ + if (dln2_transfer_complete(dln2, urb, handle, echo)) + return; + } + +out: + err = usb_submit_urb(urb, GFP_ATOMIC); + if (err < 0) + dev_err(dev, "failed to resubmit RX URB: %d\n", err); +} + +static void *dln2_prep_buf(u16 handle, u16 cmd, u16 echo, const void *obuf, + int *obuf_len, gfp_t gfp) +{ + int len; + void *buf; + struct dln2_header *hdr; + + len = *obuf_len + sizeof(*hdr); + buf = kmalloc(len, gfp); + if (!buf) + return NULL; + + hdr = (struct dln2_header *)buf; + hdr->id = cpu_to_le16(cmd); + hdr->size = cpu_to_le16(len); + hdr->echo = cpu_to_le16(echo); + hdr->handle = cpu_to_le16(handle); + + memcpy(buf + sizeof(*hdr), obuf, *obuf_len); + + *obuf_len = len; + + return buf; +} + +static int dln2_send_wait(struct dln2_dev *dln2, u16 handle, u16 cmd, u16 echo, + const void *obuf, int obuf_len) +{ + int ret = 0; + int len = obuf_len; + void *buf; + int actual; + + buf = dln2_prep_buf(handle, cmd, echo, obuf, &len, GFP_KERNEL); + if (!buf) + return -ENOMEM; + + ret = usb_bulk_msg(dln2->usb_dev, + usb_sndbulkpipe(dln2->usb_dev, dln2->ep_out), + buf, len, &actual, DLN2_USB_TIMEOUT); + + kfree(buf); + + return ret; +} + +static bool find_free_slot(struct dln2_dev *dln2, u16 handle, int *slot) +{ + struct dln2_mod_rx_slots *rxs; + unsigned long flags; + + if (dln2->disconnect) { + *slot = -ENODEV; + return true; + } + + rxs = &dln2->mod_rx_slots[handle]; + + spin_lock_irqsave(&rxs->lock, flags); + + *slot = find_first_zero_bit(rxs->bmap, DLN2_MAX_RX_SLOTS); + + if (*slot < DLN2_MAX_RX_SLOTS) { + struct dln2_rx_context *rxc = &rxs->slots[*slot]; + + set_bit(*slot, rxs->bmap); + rxc->in_use = true; + } + + spin_unlock_irqrestore(&rxs->lock, flags); + + return *slot < DLN2_MAX_RX_SLOTS; +} + +static int alloc_rx_slot(struct dln2_dev *dln2, u16 handle) +{ + int ret; + int slot; + + /* + * No need to timeout here, the wait is bounded by the timeout in + * _dln2_transfer. + */ + ret = wait_event_interruptible(dln2->mod_rx_slots[handle].wq, + find_free_slot(dln2, handle, &slot)); + if (ret < 0) + return ret; + + return slot; +} + +static void free_rx_slot(struct dln2_dev *dln2, u16 handle, int slot) +{ + struct dln2_mod_rx_slots *rxs; + struct urb *urb = NULL; + unsigned long flags; + struct dln2_rx_context *rxc; + + rxs = &dln2->mod_rx_slots[handle]; + + spin_lock_irqsave(&rxs->lock, flags); + + clear_bit(slot, rxs->bmap); + + rxc = &rxs->slots[slot]; + rxc->in_use = false; + urb = rxc->urb; + rxc->urb = NULL; + reinit_completion(&rxc->done); + + spin_unlock_irqrestore(&rxs->lock, flags); + + if (urb) { + int err; + struct device *dev = &dln2->interface->dev; + + err = usb_submit_urb(urb, GFP_KERNEL); + if (err < 0) + dev_err(dev, "failed to resubmit RX URB: %d\n", err); + } + + wake_up_interruptible(&rxs->wq); +} + +static int _dln2_transfer(struct dln2_dev *dln2, u16 handle, u16 cmd, + const void *obuf, unsigned int obuf_len, + void *ibuf, unsigned int *ibuf_len) +{ + int ret = 0; + int rx_slot; + struct dln2_response *rsp; + struct dln2_rx_context *rxc; + struct device *dev = &dln2->interface->dev; + const unsigned long timeout = msecs_to_jiffies(DLN2_USB_TIMEOUT); + struct dln2_mod_rx_slots *rxs = &dln2->mod_rx_slots[handle]; + int size; + + spin_lock(&dln2->disconnect_lock); + if (!dln2->disconnect) + dln2->active_transfers++; + else + ret = -ENODEV; + spin_unlock(&dln2->disconnect_lock); + + if (ret) + return ret; + + rx_slot = alloc_rx_slot(dln2, handle); + if (rx_slot < 0) { + ret = rx_slot; + goto out_decr; + } + + ret = dln2_send_wait(dln2, handle, cmd, rx_slot, obuf, obuf_len); + if (ret < 0) { + dev_err(dev, "USB write failed: %d\n", ret); + goto out_free_rx_slot; + } + + rxc = &rxs->slots[rx_slot]; + + ret = wait_for_completion_interruptible_timeout(&rxc->done, timeout); + if (ret <= 0) { + if (!ret) + ret = -ETIMEDOUT; + goto out_free_rx_slot; + } else { + ret = 0; + } + + if (dln2->disconnect) { + ret = -ENODEV; + goto out_free_rx_slot; + } + + /* if we got here we know that the response header has been checked */ + rsp = rxc->urb->transfer_buffer; + size = le16_to_cpu(rsp->hdr.size); + + if (size < sizeof(*rsp)) { + ret = -EPROTO; + goto out_free_rx_slot; + } + + if (le16_to_cpu(rsp->result) > 0x80) { + dev_dbg(dev, "%d received response with error %d\n", + handle, le16_to_cpu(rsp->result)); + ret = -EREMOTEIO; + goto out_free_rx_slot; + } + + if (!ibuf) + goto out_free_rx_slot; + + if (*ibuf_len > size - sizeof(*rsp)) + *ibuf_len = size - sizeof(*rsp); + + memcpy(ibuf, rsp + 1, *ibuf_len); + +out_free_rx_slot: + free_rx_slot(dln2, handle, rx_slot); +out_decr: + spin_lock(&dln2->disconnect_lock); + dln2->active_transfers--; + spin_unlock(&dln2->disconnect_lock); + if (dln2->disconnect) + wake_up(&dln2->disconnect_wq); + + return ret; +} + +int dln2_transfer(struct platform_device *pdev, u16 cmd, + const void *obuf, unsigned int obuf_len, + void *ibuf, unsigned int *ibuf_len) +{ + struct dln2_platform_data *dln2_pdata; + struct dln2_dev *dln2; + u16 handle; + + dln2 = dev_get_drvdata(pdev->dev.parent); + dln2_pdata = dev_get_platdata(&pdev->dev); + handle = dln2_pdata->handle; + + return _dln2_transfer(dln2, handle, cmd, obuf, obuf_len, ibuf, + ibuf_len); +} +EXPORT_SYMBOL(dln2_transfer); + +static int dln2_check_hw(struct dln2_dev *dln2) +{ + int ret; + __le32 hw_type; + int len = sizeof(hw_type); + + ret = _dln2_transfer(dln2, DLN2_HANDLE_CTRL, CMD_GET_DEVICE_VER, + NULL, 0, &hw_type, &len); + if (ret < 0) + return ret; + if (len < sizeof(hw_type)) + return -EREMOTEIO; + + if (le32_to_cpu(hw_type) != DLN2_HW_ID) { + dev_err(&dln2->interface->dev, "Device ID 0x%x not supported\n", + le32_to_cpu(hw_type)); + return -ENODEV; + } + + return 0; +} + +static int dln2_print_serialno(struct dln2_dev *dln2) +{ + int ret; + __le32 serial_no; + int len = sizeof(serial_no); + struct device *dev = &dln2->interface->dev; + + ret = _dln2_transfer(dln2, DLN2_HANDLE_CTRL, CMD_GET_DEVICE_SN, NULL, 0, + &serial_no, &len); + if (ret < 0) + return ret; + if (len < sizeof(serial_no)) + return -EREMOTEIO; + + dev_info(dev, "Diolan DLN2 serial %u\n", le32_to_cpu(serial_no)); + + return 0; +} + +static int dln2_hw_init(struct dln2_dev *dln2) +{ + int ret; + + ret = dln2_check_hw(dln2); + if (ret < 0) + return ret; + + return dln2_print_serialno(dln2); +} + +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]); +} + +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); +} + +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; + struct device *dev = &dln2->interface->dev; + + for (i = 0; i < DLN2_MAX_URBS; i++) { + dln2->rx_buf[i] = devm_kmalloc(dev, 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, + DLN2_ACPI_MATCH_ADC = 3, +}; + +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, +}; + +/* Only one ADC port supported */ +static struct dln2_platform_data dln2_pdata_adc = { + .handle = DLN2_HANDLE_ADC, + .port = 0, +}; + +static struct mfd_cell_acpi_match dln2_acpi_match_adc = { + .adr = DLN2_ACPI_MATCH_ADC, +}; + +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), + }, + { + .name = "dln2-adc", + .acpi_match = &dln2_acpi_match_adc, + .platform_data = &dln2_pdata_adc, + .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) + return -ENODEV; + + ret = usb_find_common_endpoints(hostif, &epin, &epout, NULL, NULL); + if (ret) + return ret; + + dln2 = devm_kzalloc(dev, sizeof(*dln2), GFP_KERNEL); + if (!dln2) + return -ENOMEM; + + dln2->ep_out = epout->bEndpointAddress; + dln2->ep_in = epin->bEndpointAddress; + dln2->usb_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 "); +MODULE_DESCRIPTION("Core driver for the Diolan DLN2 interface adapter"); +MODULE_LICENSE("GPL v2"); -- cgit v1.3.1