| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * Greybus "AP" USB driver for "ES2" controller chips |
| * |
| * Copyright 2014-2015 Google Inc. |
| * Copyright 2014-2015 Linaro Ltd. |
| */ |
| #include <linux/kthread.h> |
| #include <linux/sizes.h> |
| #include <linux/usb.h> |
| #include <linux/kfifo.h> |
| #include <linux/debugfs.h> |
| #include <linux/list.h> |
| #include <linux/greybus.h> |
| #include <asm/unaligned.h> |
| |
| #include "arpc.h" |
| #include "greybus_trace.h" |
| |
| |
| /* Default timeout for USB vendor requests. */ |
| #define ES2_USB_CTRL_TIMEOUT 500 |
| |
| /* Default timeout for ARPC CPort requests */ |
| #define ES2_ARPC_CPORT_TIMEOUT 500 |
| |
| /* Fixed CPort numbers */ |
| #define ES2_CPORT_CDSI0 16 |
| #define ES2_CPORT_CDSI1 17 |
| |
| /* Memory sizes for the buffers sent to/from the ES2 controller */ |
| #define ES2_GBUF_MSG_SIZE_MAX 2048 |
| |
| /* Memory sizes for the ARPC buffers */ |
| #define ARPC_OUT_SIZE_MAX U16_MAX |
| #define ARPC_IN_SIZE_MAX 128 |
| |
| static const struct usb_device_id id_table[] = { |
| { USB_DEVICE(0x18d1, 0x1eaf) }, |
| { }, |
| }; |
| MODULE_DEVICE_TABLE(usb, id_table); |
| |
| #define APB1_LOG_SIZE SZ_16K |
| |
| /* |
| * Number of CPort IN urbs in flight at any point in time. |
| * Adjust if we are having stalls in the USB buffer due to not enough urbs in |
| * flight. |
| */ |
| #define NUM_CPORT_IN_URB 4 |
| |
| /* Number of CPort OUT urbs in flight at any point in time. |
| * Adjust if we get messages saying we are out of urbs in the system log. |
| */ |
| #define NUM_CPORT_OUT_URB 8 |
| |
| /* |
| * Number of ARPC in urbs in flight at any point in time. |
| */ |
| #define NUM_ARPC_IN_URB 2 |
| |
| /* |
| * @endpoint: bulk in endpoint for CPort data |
| * @urb: array of urbs for the CPort in messages |
| * @buffer: array of buffers for the @cport_in_urb urbs |
| */ |
| struct es2_cport_in { |
| __u8 endpoint; |
| struct urb *urb[NUM_CPORT_IN_URB]; |
| u8 *buffer[NUM_CPORT_IN_URB]; |
| }; |
| |
| /** |
| * struct es2_ap_dev - ES2 USB Bridge to AP structure |
| * @usb_dev: pointer to the USB device we are. |
| * @usb_intf: pointer to the USB interface we are bound to. |
| * @hd: pointer to our gb_host_device structure |
| * |
| * @cport_in: endpoint, urbs and buffer for cport in messages |
| * @cport_out_endpoint: endpoint for cport out messages |
| * @cport_out_urb: array of urbs for the CPort out messages |
| * @cport_out_urb_busy: array of flags to see if the @cport_out_urb is busy or |
| * not. |
| * @cport_out_urb_cancelled: array of flags indicating whether the |
| * corresponding @cport_out_urb is being cancelled |
| * @cport_out_urb_lock: locks the @cport_out_urb_busy "list" |
| * @cdsi1_in_use: true if cport CDSI1 is in use |
| * @apb_log_task: task pointer for logging thread |
| * @apb_log_dentry: file system entry for the log file interface |
| * @apb_log_enable_dentry: file system entry for enabling logging |
| * @apb_log_fifo: kernel FIFO to carry logged data |
| * @arpc_urb: array of urbs for the ARPC in messages |
| * @arpc_buffer: array of buffers for the @arpc_urb urbs |
| * @arpc_endpoint_in: bulk in endpoint for APBridgeA RPC |
| * @arpc_id_cycle: gives an unique id to ARPC |
| * @arpc_lock: locks ARPC list |
| * @arpcs: list of in progress ARPCs |
| */ |
| struct es2_ap_dev { |
| struct usb_device *usb_dev; |
| struct usb_interface *usb_intf; |
| struct gb_host_device *hd; |
| |
| struct es2_cport_in cport_in; |
| __u8 cport_out_endpoint; |
| struct urb *cport_out_urb[NUM_CPORT_OUT_URB]; |
| bool cport_out_urb_busy[NUM_CPORT_OUT_URB]; |
| bool cport_out_urb_cancelled[NUM_CPORT_OUT_URB]; |
| spinlock_t cport_out_urb_lock; |
| |
| bool cdsi1_in_use; |
| |
| struct task_struct *apb_log_task; |
| struct dentry *apb_log_dentry; |
| struct dentry *apb_log_enable_dentry; |
| DECLARE_KFIFO(apb_log_fifo, char, APB1_LOG_SIZE); |
| |
| __u8 arpc_endpoint_in; |
| struct urb *arpc_urb[NUM_ARPC_IN_URB]; |
| u8 *arpc_buffer[NUM_ARPC_IN_URB]; |
| |
| int arpc_id_cycle; |
| spinlock_t arpc_lock; |
| struct list_head arpcs; |
| }; |
| |
| struct arpc { |
| struct list_head list; |
| struct arpc_request_message *req; |
| struct arpc_response_message *resp; |
| struct completion response_received; |
| bool active; |
| }; |
| |
| static inline struct es2_ap_dev *hd_to_es2(struct gb_host_device *hd) |
| { |
| return (struct es2_ap_dev *)&hd->hd_priv; |
| } |
| |
| static void cport_out_callback(struct urb *urb); |
| static void usb_log_enable(struct es2_ap_dev *es2); |
| static void usb_log_disable(struct es2_ap_dev *es2); |
| static int arpc_sync(struct es2_ap_dev *es2, u8 type, void *payload, |
| size_t size, int *result, unsigned int timeout); |
| |
| static int output_sync(struct es2_ap_dev *es2, void *req, u16 size, u8 cmd) |
| { |
| struct usb_device *udev = es2->usb_dev; |
| u8 *data; |
| int retval; |
| |
| data = kmemdup(req, size, GFP_KERNEL); |
| if (!data) |
| return -ENOMEM; |
| |
| retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
| cmd, |
| USB_DIR_OUT | USB_TYPE_VENDOR | |
| USB_RECIP_INTERFACE, |
| 0, 0, data, size, ES2_USB_CTRL_TIMEOUT); |
| if (retval < 0) |
| dev_err(&udev->dev, "%s: return error %d\n", __func__, retval); |
| else |
| retval = 0; |
| |
| kfree(data); |
| return retval; |
| } |
| |
| static void ap_urb_complete(struct urb *urb) |
| { |
| struct usb_ctrlrequest *dr = urb->context; |
| |
| kfree(dr); |
| usb_free_urb(urb); |
| } |
| |
| static int output_async(struct es2_ap_dev *es2, void *req, u16 size, u8 cmd) |
| { |
| struct usb_device *udev = es2->usb_dev; |
| struct urb *urb; |
| struct usb_ctrlrequest *dr; |
| u8 *buf; |
| int retval; |
| |
| urb = usb_alloc_urb(0, GFP_ATOMIC); |
| if (!urb) |
| return -ENOMEM; |
| |
| dr = kmalloc(sizeof(*dr) + size, GFP_ATOMIC); |
| if (!dr) { |
| usb_free_urb(urb); |
| return -ENOMEM; |
| } |
| |
| buf = (u8 *)dr + sizeof(*dr); |
| memcpy(buf, req, size); |
| |
| dr->bRequest = cmd; |
| dr->bRequestType = USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE; |
| dr->wValue = 0; |
| dr->wIndex = 0; |
| dr->wLength = cpu_to_le16(size); |
| |
| usb_fill_control_urb(urb, udev, usb_sndctrlpipe(udev, 0), |
| (unsigned char *)dr, buf, size, |
| ap_urb_complete, dr); |
| retval = usb_submit_urb(urb, GFP_ATOMIC); |
| if (retval) { |
| usb_free_urb(urb); |
| kfree(dr); |
| } |
| return retval; |
| } |
| |
| static int output(struct gb_host_device *hd, void *req, u16 size, u8 cmd, |
| bool async) |
| { |
| struct es2_ap_dev *es2 = hd_to_es2(hd); |
| |
| if (async) |
| return output_async(es2, req, size, cmd); |
| |
| return output_sync(es2, req, size, cmd); |
| } |
| |
| static int es2_cport_in_enable(struct es2_ap_dev *es2, |
| struct es2_cport_in *cport_in) |
| { |
| struct urb *urb; |
| int ret; |
| int i; |
| |
| for (i = 0; i < NUM_CPORT_IN_URB; ++i) { |
| urb = cport_in->urb[i]; |
| |
| ret = usb_submit_urb(urb, GFP_KERNEL); |
| if (ret) { |
| dev_err(&es2->usb_dev->dev, |
| "failed to submit in-urb: %d\n", ret); |
| goto err_kill_urbs; |
| } |
| } |
| |
| return 0; |
| |
| err_kill_urbs: |
| for (--i; i >= 0; --i) { |
| urb = cport_in->urb[i]; |
| usb_kill_urb(urb); |
| } |
| |
| return ret; |
| } |
| |
| static void es2_cport_in_disable(struct es2_ap_dev *es2, |
| struct es2_cport_in *cport_in) |
| { |
| struct urb *urb; |
| int i; |
| |
| for (i = 0; i < NUM_CPORT_IN_URB; ++i) { |
| urb = cport_in->urb[i]; |
| usb_kill_urb(urb); |
| } |
| } |
| |
| static int es2_arpc_in_enable(struct es2_ap_dev *es2) |
| { |
| struct urb *urb; |
| int ret; |
| int i; |
| |
| for (i = 0; i < NUM_ARPC_IN_URB; ++i) { |
| urb = es2->arpc_urb[i]; |
| |
| ret = usb_submit_urb(urb, GFP_KERNEL); |
| if (ret) { |
| dev_err(&es2->usb_dev->dev, |
| "failed to submit arpc in-urb: %d\n", ret); |
| goto err_kill_urbs; |
| } |
| } |
| |
| return 0; |
| |
| err_kill_urbs: |
| for (--i; i >= 0; --i) { |
| urb = es2->arpc_urb[i]; |
| usb_kill_urb(urb); |
| } |
| |
| return ret; |
| } |
| |
| static void es2_arpc_in_disable(struct es2_ap_dev *es2) |
| { |
| struct urb *urb; |
| int i; |
| |
| for (i = 0; i < NUM_ARPC_IN_URB; ++i) { |
| urb = es2->arpc_urb[i]; |
| usb_kill_urb(urb); |
| } |
| } |
| |
| static struct urb *next_free_urb(struct es2_ap_dev *es2, gfp_t gfp_mask) |
| { |
| struct urb *urb = NULL; |
| unsigned long flags; |
| int i; |
| |
| spin_lock_irqsave(&es2->cport_out_urb_lock, flags); |
| |
| /* Look in our pool of allocated urbs first, as that's the "fastest" */ |
| for (i = 0; i < NUM_CPORT_OUT_URB; ++i) { |
| if (!es2->cport_out_urb_busy[i] && |
| !es2->cport_out_urb_cancelled[i]) { |
| es2->cport_out_urb_busy[i] = true; |
| urb = es2->cport_out_urb[i]; |
| break; |
| } |
| } |
| spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags); |
| if (urb) |
| return urb; |
| |
| /* |
| * Crap, pool is empty, complain to the syslog and go allocate one |
| * dynamically as we have to succeed. |
| */ |
| dev_dbg(&es2->usb_dev->dev, |
| "No free CPort OUT urbs, having to dynamically allocate one!\n"); |
| return usb_alloc_urb(0, gfp_mask); |
| } |
| |
| static void free_urb(struct es2_ap_dev *es2, struct urb *urb) |
| { |
| unsigned long flags; |
| int i; |
| /* |
| * See if this was an urb in our pool, if so mark it "free", otherwise |
| * we need to free it ourselves. |
| */ |
| spin_lock_irqsave(&es2->cport_out_urb_lock, flags); |
| for (i = 0; i < NUM_CPORT_OUT_URB; ++i) { |
| if (urb == es2->cport_out_urb[i]) { |
| es2->cport_out_urb_busy[i] = false; |
| urb = NULL; |
| break; |
| } |
| } |
| spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags); |
| |
| /* If urb is not NULL, then we need to free this urb */ |
| usb_free_urb(urb); |
| } |
| |
| /* |
| * We (ab)use the operation-message header pad bytes to transfer the |
| * cport id in order to minimise overhead. |
| */ |
| static void |
| gb_message_cport_pack(struct gb_operation_msg_hdr *header, u16 cport_id) |
| { |
| header->pad[0] = cport_id; |
| } |
| |
| /* Clear the pad bytes used for the CPort id */ |
| static void gb_message_cport_clear(struct gb_operation_msg_hdr *header) |
| { |
| header->pad[0] = 0; |
| } |
| |
| /* Extract the CPort id packed into the header, and clear it */ |
| static u16 gb_message_cport_unpack(struct gb_operation_msg_hdr *header) |
| { |
| u16 cport_id = header->pad[0]; |
| |
| gb_message_cport_clear(header); |
| |
| return cport_id; |
| } |
| |
| /* |
| * Returns zero if the message was successfully queued, or a negative errno |
| * otherwise. |
| */ |
| static int message_send(struct gb_host_device *hd, u16 cport_id, |
| struct gb_message *message, gfp_t gfp_mask) |
| { |
| struct es2_ap_dev *es2 = hd_to_es2(hd); |
| struct usb_device *udev = es2->usb_dev; |
| size_t buffer_size; |
| int retval; |
| struct urb *urb; |
| unsigned long flags; |
| |
| /* |
| * The data actually transferred will include an indication |
| * of where the data should be sent. Do one last check of |
| * the target CPort id before filling it in. |
| */ |
| if (!cport_id_valid(hd, cport_id)) { |
| dev_err(&udev->dev, "invalid cport %u\n", cport_id); |
| return -EINVAL; |
| } |
| |
| /* Find a free urb */ |
| urb = next_free_urb(es2, gfp_mask); |
| if (!urb) |
| return -ENOMEM; |
| |
| spin_lock_irqsave(&es2->cport_out_urb_lock, flags); |
| message->hcpriv = urb; |
| spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags); |
| |
| /* Pack the cport id into the message header */ |
| gb_message_cport_pack(message->header, cport_id); |
| |
| buffer_size = sizeof(*message->header) + message->payload_size; |
| |
| usb_fill_bulk_urb(urb, udev, |
| usb_sndbulkpipe(udev, |
| es2->cport_out_endpoint), |
| message->buffer, buffer_size, |
| cport_out_callback, message); |
| urb->transfer_flags |= URB_ZERO_PACKET; |
| |
| trace_gb_message_submit(message); |
| |
| retval = usb_submit_urb(urb, gfp_mask); |
| if (retval) { |
| dev_err(&udev->dev, "failed to submit out-urb: %d\n", retval); |
| |
| spin_lock_irqsave(&es2->cport_out_urb_lock, flags); |
| message->hcpriv = NULL; |
| spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags); |
| |
| free_urb(es2, urb); |
| gb_message_cport_clear(message->header); |
| |
| return retval; |
| } |
| |
| return 0; |
| } |
| |
| /* |
| * Can not be called in atomic context. |
| */ |
| static void message_cancel(struct gb_message *message) |
| { |
| struct gb_host_device *hd = message->operation->connection->hd; |
| struct es2_ap_dev *es2 = hd_to_es2(hd); |
| struct urb *urb; |
| int i; |
| |
| might_sleep(); |
| |
| spin_lock_irq(&es2->cport_out_urb_lock); |
| urb = message->hcpriv; |
| |
| /* Prevent dynamically allocated urb from being deallocated. */ |
| usb_get_urb(urb); |
| |
| /* Prevent pre-allocated urb from being reused. */ |
| for (i = 0; i < NUM_CPORT_OUT_URB; ++i) { |
| if (urb == es2->cport_out_urb[i]) { |
| es2->cport_out_urb_cancelled[i] = true; |
| break; |
| } |
| } |
| spin_unlock_irq(&es2->cport_out_urb_lock); |
| |
| usb_kill_urb(urb); |
| |
| if (i < NUM_CPORT_OUT_URB) { |
| spin_lock_irq(&es2->cport_out_urb_lock); |
| es2->cport_out_urb_cancelled[i] = false; |
| spin_unlock_irq(&es2->cport_out_urb_lock); |
| } |
| |
| usb_free_urb(urb); |
| } |
| |
| static int es2_cport_allocate(struct gb_host_device *hd, int cport_id, |
| unsigned long flags) |
| { |
| struct es2_ap_dev *es2 = hd_to_es2(hd); |
| struct ida *id_map = &hd->cport_id_map; |
| int ida_start, ida_end; |
| |
| switch (cport_id) { |
| case ES2_CPORT_CDSI0: |
| case ES2_CPORT_CDSI1: |
| dev_err(&hd->dev, "cport %d not available\n", cport_id); |
| return -EBUSY; |
| } |
| |
| if (flags & GB_CONNECTION_FLAG_OFFLOADED && |
| flags & GB_CONNECTION_FLAG_CDSI1) { |
| if (es2->cdsi1_in_use) { |
| dev_err(&hd->dev, "CDSI1 already in use\n"); |
| return -EBUSY; |
| } |
| |
| es2->cdsi1_in_use = true; |
| |
| return ES2_CPORT_CDSI1; |
| } |
| |
| if (cport_id < 0) { |
| ida_start = 0; |
| ida_end = hd->num_cports - 1; |
| } else if (cport_id < hd->num_cports) { |
| ida_start = cport_id; |
| ida_end = cport_id; |
| } else { |
| dev_err(&hd->dev, "cport %d not available\n", cport_id); |
| return -EINVAL; |
| } |
| |
| return ida_alloc_range(id_map, ida_start, ida_end, GFP_KERNEL); |
| } |
| |
| static void es2_cport_release(struct gb_host_device *hd, u16 cport_id) |
| { |
| struct es2_ap_dev *es2 = hd_to_es2(hd); |
| |
| switch (cport_id) { |
| case ES2_CPORT_CDSI1: |
| es2->cdsi1_in_use = false; |
| return; |
| } |
| |
| ida_free(&hd->cport_id_map, cport_id); |
| } |
| |
| static int cport_enable(struct gb_host_device *hd, u16 cport_id, |
| unsigned long flags) |
| { |
| struct es2_ap_dev *es2 = hd_to_es2(hd); |
| struct usb_device *udev = es2->usb_dev; |
| struct gb_apb_request_cport_flags *req; |
| u32 connection_flags; |
| int ret; |
| |
| req = kzalloc(sizeof(*req), GFP_KERNEL); |
| if (!req) |
| return -ENOMEM; |
| |
| connection_flags = 0; |
| if (flags & GB_CONNECTION_FLAG_CONTROL) |
| connection_flags |= GB_APB_CPORT_FLAG_CONTROL; |
| if (flags & GB_CONNECTION_FLAG_HIGH_PRIO) |
| connection_flags |= GB_APB_CPORT_FLAG_HIGH_PRIO; |
| |
| req->flags = cpu_to_le32(connection_flags); |
| |
| dev_dbg(&hd->dev, "%s - cport = %u, flags = %02x\n", __func__, |
| cport_id, connection_flags); |
| |
| ret = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
| GB_APB_REQUEST_CPORT_FLAGS, |
| USB_DIR_OUT | USB_TYPE_VENDOR | |
| USB_RECIP_INTERFACE, cport_id, 0, |
| req, sizeof(*req), ES2_USB_CTRL_TIMEOUT); |
| if (ret < 0) { |
| dev_err(&udev->dev, "failed to set cport flags for port %d\n", |
| cport_id); |
| goto out; |
| } |
| |
| ret = 0; |
| out: |
| kfree(req); |
| |
| return ret; |
| } |
| |
| static int es2_cport_connected(struct gb_host_device *hd, u16 cport_id) |
| { |
| struct es2_ap_dev *es2 = hd_to_es2(hd); |
| struct device *dev = &es2->usb_dev->dev; |
| struct arpc_cport_connected_req req; |
| int ret; |
| |
| req.cport_id = cpu_to_le16(cport_id); |
| ret = arpc_sync(es2, ARPC_TYPE_CPORT_CONNECTED, &req, sizeof(req), |
| NULL, ES2_ARPC_CPORT_TIMEOUT); |
| if (ret) { |
| dev_err(dev, "failed to set connected state for cport %u: %d\n", |
| cport_id, ret); |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| static int es2_cport_flush(struct gb_host_device *hd, u16 cport_id) |
| { |
| struct es2_ap_dev *es2 = hd_to_es2(hd); |
| struct device *dev = &es2->usb_dev->dev; |
| struct arpc_cport_flush_req req; |
| int ret; |
| |
| req.cport_id = cpu_to_le16(cport_id); |
| ret = arpc_sync(es2, ARPC_TYPE_CPORT_FLUSH, &req, sizeof(req), |
| NULL, ES2_ARPC_CPORT_TIMEOUT); |
| if (ret) { |
| dev_err(dev, "failed to flush cport %u: %d\n", cport_id, ret); |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| static int es2_cport_shutdown(struct gb_host_device *hd, u16 cport_id, |
| u8 phase, unsigned int timeout) |
| { |
| struct es2_ap_dev *es2 = hd_to_es2(hd); |
| struct device *dev = &es2->usb_dev->dev; |
| struct arpc_cport_shutdown_req req; |
| int result; |
| int ret; |
| |
| if (timeout > U16_MAX) |
| return -EINVAL; |
| |
| req.cport_id = cpu_to_le16(cport_id); |
| req.timeout = cpu_to_le16(timeout); |
| req.phase = phase; |
| ret = arpc_sync(es2, ARPC_TYPE_CPORT_SHUTDOWN, &req, sizeof(req), |
| &result, ES2_ARPC_CPORT_TIMEOUT + timeout); |
| if (ret) { |
| dev_err(dev, "failed to send shutdown over cport %u: %d (%d)\n", |
| cport_id, ret, result); |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| static int es2_cport_quiesce(struct gb_host_device *hd, u16 cport_id, |
| size_t peer_space, unsigned int timeout) |
| { |
| struct es2_ap_dev *es2 = hd_to_es2(hd); |
| struct device *dev = &es2->usb_dev->dev; |
| struct arpc_cport_quiesce_req req; |
| int result; |
| int ret; |
| |
| if (peer_space > U16_MAX) |
| return -EINVAL; |
| |
| if (timeout > U16_MAX) |
| return -EINVAL; |
| |
| req.cport_id = cpu_to_le16(cport_id); |
| req.peer_space = cpu_to_le16(peer_space); |
| req.timeout = cpu_to_le16(timeout); |
| ret = arpc_sync(es2, ARPC_TYPE_CPORT_QUIESCE, &req, sizeof(req), |
| &result, ES2_ARPC_CPORT_TIMEOUT + timeout); |
| if (ret) { |
| dev_err(dev, "failed to quiesce cport %u: %d (%d)\n", |
| cport_id, ret, result); |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| static int es2_cport_clear(struct gb_host_device *hd, u16 cport_id) |
| { |
| struct es2_ap_dev *es2 = hd_to_es2(hd); |
| struct device *dev = &es2->usb_dev->dev; |
| struct arpc_cport_clear_req req; |
| int ret; |
| |
| req.cport_id = cpu_to_le16(cport_id); |
| ret = arpc_sync(es2, ARPC_TYPE_CPORT_CLEAR, &req, sizeof(req), |
| NULL, ES2_ARPC_CPORT_TIMEOUT); |
| if (ret) { |
| dev_err(dev, "failed to clear cport %u: %d\n", cport_id, ret); |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| static int latency_tag_enable(struct gb_host_device *hd, u16 cport_id) |
| { |
| int retval; |
| struct es2_ap_dev *es2 = hd_to_es2(hd); |
| struct usb_device *udev = es2->usb_dev; |
| |
| retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
| GB_APB_REQUEST_LATENCY_TAG_EN, |
| USB_DIR_OUT | USB_TYPE_VENDOR | |
| USB_RECIP_INTERFACE, cport_id, 0, NULL, |
| 0, ES2_USB_CTRL_TIMEOUT); |
| |
| if (retval < 0) |
| dev_err(&udev->dev, "Cannot enable latency tag for cport %d\n", |
| cport_id); |
| return retval; |
| } |
| |
| static int latency_tag_disable(struct gb_host_device *hd, u16 cport_id) |
| { |
| int retval; |
| struct es2_ap_dev *es2 = hd_to_es2(hd); |
| struct usb_device *udev = es2->usb_dev; |
| |
| retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
| GB_APB_REQUEST_LATENCY_TAG_DIS, |
| USB_DIR_OUT | USB_TYPE_VENDOR | |
| USB_RECIP_INTERFACE, cport_id, 0, NULL, |
| 0, ES2_USB_CTRL_TIMEOUT); |
| |
| if (retval < 0) |
| dev_err(&udev->dev, "Cannot disable latency tag for cport %d\n", |
| cport_id); |
| return retval; |
| } |
| |
| static struct gb_hd_driver es2_driver = { |
| .hd_priv_size = sizeof(struct es2_ap_dev), |
| .message_send = message_send, |
| .message_cancel = message_cancel, |
| .cport_allocate = es2_cport_allocate, |
| .cport_release = es2_cport_release, |
| .cport_enable = cport_enable, |
| .cport_connected = es2_cport_connected, |
| .cport_flush = es2_cport_flush, |
| .cport_shutdown = es2_cport_shutdown, |
| .cport_quiesce = es2_cport_quiesce, |
| .cport_clear = es2_cport_clear, |
| .latency_tag_enable = latency_tag_enable, |
| .latency_tag_disable = latency_tag_disable, |
| .output = output, |
| }; |
| |
| /* Common function to report consistent warnings based on URB status */ |
| static int check_urb_status(struct urb *urb) |
| { |
| struct device *dev = &urb->dev->dev; |
| int status = urb->status; |
| |
| switch (status) { |
| case 0: |
| return 0; |
| |
| case -EOVERFLOW: |
| dev_err(dev, "%s: overflow actual length is %d\n", |
| __func__, urb->actual_length); |
| fallthrough; |
| case -ECONNRESET: |
| case -ENOENT: |
| case -ESHUTDOWN: |
| case -EILSEQ: |
| case -EPROTO: |
| /* device is gone, stop sending */ |
| return status; |
| } |
| dev_err(dev, "%s: unknown status %d\n", __func__, status); |
| |
| return -EAGAIN; |
| } |
| |
| static void es2_destroy(struct es2_ap_dev *es2) |
| { |
| struct usb_device *udev; |
| struct urb *urb; |
| int i; |
| |
| debugfs_remove(es2->apb_log_enable_dentry); |
| usb_log_disable(es2); |
| |
| /* Tear down everything! */ |
| for (i = 0; i < NUM_CPORT_OUT_URB; ++i) { |
| urb = es2->cport_out_urb[i]; |
| usb_kill_urb(urb); |
| usb_free_urb(urb); |
| es2->cport_out_urb[i] = NULL; |
| es2->cport_out_urb_busy[i] = false; /* just to be anal */ |
| } |
| |
| for (i = 0; i < NUM_ARPC_IN_URB; ++i) { |
| usb_free_urb(es2->arpc_urb[i]); |
| kfree(es2->arpc_buffer[i]); |
| es2->arpc_buffer[i] = NULL; |
| } |
| |
| for (i = 0; i < NUM_CPORT_IN_URB; ++i) { |
| usb_free_urb(es2->cport_in.urb[i]); |
| kfree(es2->cport_in.buffer[i]); |
| es2->cport_in.buffer[i] = NULL; |
| } |
| |
| /* release reserved CDSI0 and CDSI1 cports */ |
| gb_hd_cport_release_reserved(es2->hd, ES2_CPORT_CDSI1); |
| gb_hd_cport_release_reserved(es2->hd, ES2_CPORT_CDSI0); |
| |
| udev = es2->usb_dev; |
| gb_hd_put(es2->hd); |
| |
| usb_put_dev(udev); |
| } |
| |
| static void cport_in_callback(struct urb *urb) |
| { |
| struct gb_host_device *hd = urb->context; |
| struct device *dev = &urb->dev->dev; |
| struct gb_operation_msg_hdr *header; |
| int status = check_urb_status(urb); |
| int retval; |
| u16 cport_id; |
| |
| if (status) { |
| if ((status == -EAGAIN) || (status == -EPROTO)) |
| goto exit; |
| |
| /* The urb is being unlinked */ |
| if (status == -ENOENT || status == -ESHUTDOWN) |
| return; |
| |
| dev_err(dev, "urb cport in error %d (dropped)\n", status); |
| return; |
| } |
| |
| if (urb->actual_length < sizeof(*header)) { |
| dev_err(dev, "short message received\n"); |
| goto exit; |
| } |
| |
| /* Extract the CPort id, which is packed in the message header */ |
| header = urb->transfer_buffer; |
| cport_id = gb_message_cport_unpack(header); |
| |
| if (cport_id_valid(hd, cport_id)) { |
| greybus_data_rcvd(hd, cport_id, urb->transfer_buffer, |
| urb->actual_length); |
| } else { |
| dev_err(dev, "invalid cport id %u received\n", cport_id); |
| } |
| exit: |
| /* put our urb back in the request pool */ |
| retval = usb_submit_urb(urb, GFP_ATOMIC); |
| if (retval) |
| dev_err(dev, "failed to resubmit in-urb: %d\n", retval); |
| } |
| |
| static void cport_out_callback(struct urb *urb) |
| { |
| struct gb_message *message = urb->context; |
| struct gb_host_device *hd = message->operation->connection->hd; |
| struct es2_ap_dev *es2 = hd_to_es2(hd); |
| int status = check_urb_status(urb); |
| unsigned long flags; |
| |
| gb_message_cport_clear(message->header); |
| |
| spin_lock_irqsave(&es2->cport_out_urb_lock, flags); |
| message->hcpriv = NULL; |
| spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags); |
| |
| /* |
| * Tell the submitter that the message send (attempt) is |
| * complete, and report the status. |
| */ |
| greybus_message_sent(hd, message, status); |
| |
| free_urb(es2, urb); |
| } |
| |
| static struct arpc *arpc_alloc(void *payload, u16 size, u8 type) |
| { |
| struct arpc *rpc; |
| |
| if (size + sizeof(*rpc->req) > ARPC_OUT_SIZE_MAX) |
| return NULL; |
| |
| rpc = kzalloc(sizeof(*rpc), GFP_KERNEL); |
| if (!rpc) |
| return NULL; |
| |
| INIT_LIST_HEAD(&rpc->list); |
| rpc->req = kzalloc(sizeof(*rpc->req) + size, GFP_KERNEL); |
| if (!rpc->req) |
| goto err_free_rpc; |
| |
| rpc->resp = kzalloc(sizeof(*rpc->resp), GFP_KERNEL); |
| if (!rpc->resp) |
| goto err_free_req; |
| |
| rpc->req->type = type; |
| rpc->req->size = cpu_to_le16(sizeof(*rpc->req) + size); |
| memcpy(rpc->req->data, payload, size); |
| |
| init_completion(&rpc->response_received); |
| |
| return rpc; |
| |
| err_free_req: |
| kfree(rpc->req); |
| err_free_rpc: |
| kfree(rpc); |
| |
| return NULL; |
| } |
| |
| static void arpc_free(struct arpc *rpc) |
| { |
| kfree(rpc->req); |
| kfree(rpc->resp); |
| kfree(rpc); |
| } |
| |
| static struct arpc *arpc_find(struct es2_ap_dev *es2, __le16 id) |
| { |
| struct arpc *rpc; |
| |
| list_for_each_entry(rpc, &es2->arpcs, list) { |
| if (rpc->req->id == id) |
| return rpc; |
| } |
| |
| return NULL; |
| } |
| |
| static void arpc_add(struct es2_ap_dev *es2, struct arpc *rpc) |
| { |
| rpc->active = true; |
| rpc->req->id = cpu_to_le16(es2->arpc_id_cycle++); |
| list_add_tail(&rpc->list, &es2->arpcs); |
| } |
| |
| static void arpc_del(struct es2_ap_dev *es2, struct arpc *rpc) |
| { |
| if (rpc->active) { |
| rpc->active = false; |
| list_del(&rpc->list); |
| } |
| } |
| |
| static int arpc_send(struct es2_ap_dev *es2, struct arpc *rpc, int timeout) |
| { |
| struct usb_device *udev = es2->usb_dev; |
| int retval; |
| |
| retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0), |
| GB_APB_REQUEST_ARPC_RUN, |
| USB_DIR_OUT | USB_TYPE_VENDOR | |
| USB_RECIP_INTERFACE, |
| 0, 0, |
| rpc->req, le16_to_cpu(rpc->req->size), |
| ES2_USB_CTRL_TIMEOUT); |
| if (retval < 0) { |
| dev_err(&udev->dev, |
| "failed to send ARPC request %d: %d\n", |
| rpc->req->type, retval); |
| return retval; |
| } |
| |
| return 0; |
| } |
| |
| static int arpc_sync(struct es2_ap_dev *es2, u8 type, void *payload, |
| size_t size, int *result, unsigned int timeout) |
| { |
| struct arpc *rpc; |
| unsigned long flags; |
| int retval; |
| |
| if (result) |
| *result = 0; |
| |
| rpc = arpc_alloc(payload, size, type); |
| if (!rpc) |
| return -ENOMEM; |
| |
| spin_lock_irqsave(&es2->arpc_lock, flags); |
| arpc_add(es2, rpc); |
| spin_unlock_irqrestore(&es2->arpc_lock, flags); |
| |
| retval = arpc_send(es2, rpc, timeout); |
| if (retval) |
| goto out_arpc_del; |
| |
| retval = wait_for_completion_interruptible_timeout( |
| &rpc->response_received, |
| msecs_to_jiffies(timeout)); |
| if (retval <= 0) { |
| if (!retval) |
| retval = -ETIMEDOUT; |
| goto out_arpc_del; |
| } |
| |
| if (rpc->resp->result) { |
| retval = -EREMOTEIO; |
| if (result) |
| *result = rpc->resp->result; |
| } else { |
| retval = 0; |
| } |
| |
| out_arpc_del: |
| spin_lock_irqsave(&es2->arpc_lock, flags); |
| arpc_del(es2, rpc); |
| spin_unlock_irqrestore(&es2->arpc_lock, flags); |
| arpc_free(rpc); |
| |
| if (retval < 0 && retval != -EREMOTEIO) { |
| dev_err(&es2->usb_dev->dev, |
| "failed to execute ARPC: %d\n", retval); |
| } |
| |
| return retval; |
| } |
| |
| static void arpc_in_callback(struct urb *urb) |
| { |
| struct es2_ap_dev *es2 = urb->context; |
| struct device *dev = &urb->dev->dev; |
| int status = check_urb_status(urb); |
| struct arpc *rpc; |
| struct arpc_response_message *resp; |
| unsigned long flags; |
| int retval; |
| |
| if (status) { |
| if ((status == -EAGAIN) || (status == -EPROTO)) |
| goto exit; |
| |
| /* The urb is being unlinked */ |
| if (status == -ENOENT || status == -ESHUTDOWN) |
| return; |
| |
| dev_err(dev, "arpc in-urb error %d (dropped)\n", status); |
| return; |
| } |
| |
| if (urb->actual_length < sizeof(*resp)) { |
| dev_err(dev, "short aprc response received\n"); |
| goto exit; |
| } |
| |
| resp = urb->transfer_buffer; |
| spin_lock_irqsave(&es2->arpc_lock, flags); |
| rpc = arpc_find(es2, resp->id); |
| if (!rpc) { |
| dev_err(dev, "invalid arpc response id received: %u\n", |
| le16_to_cpu(resp->id)); |
| spin_unlock_irqrestore(&es2->arpc_lock, flags); |
| goto exit; |
| } |
| |
| arpc_del(es2, rpc); |
| memcpy(rpc->resp, resp, sizeof(*resp)); |
| complete(&rpc->response_received); |
| spin_unlock_irqrestore(&es2->arpc_lock, flags); |
| |
| exit: |
| /* put our urb back in the request pool */ |
| retval = usb_submit_urb(urb, GFP_ATOMIC); |
| if (retval) |
| dev_err(dev, "failed to resubmit arpc in-urb: %d\n", retval); |
| } |
| |
| #define APB1_LOG_MSG_SIZE 64 |
| static void apb_log_get(struct es2_ap_dev *es2, char *buf) |
| { |
| int retval; |
| |
| do { |
| retval = usb_control_msg(es2->usb_dev, |
| usb_rcvctrlpipe(es2->usb_dev, 0), |
| GB_APB_REQUEST_LOG, |
| USB_DIR_IN | USB_TYPE_VENDOR | |
| USB_RECIP_INTERFACE, |
| 0x00, 0x00, |
| buf, |
| APB1_LOG_MSG_SIZE, |
| ES2_USB_CTRL_TIMEOUT); |
| if (retval > 0) |
| kfifo_in(&es2->apb_log_fifo, buf, retval); |
| } while (retval > 0); |
| } |
| |
| static int apb_log_poll(void *data) |
| { |
| struct es2_ap_dev *es2 = data; |
| char *buf; |
| |
| buf = kmalloc(APB1_LOG_MSG_SIZE, GFP_KERNEL); |
| if (!buf) |
| return -ENOMEM; |
| |
| while (!kthread_should_stop()) { |
| msleep(1000); |
| apb_log_get(es2, buf); |
| } |
| |
| kfree(buf); |
| |
| return 0; |
| } |
| |
| static ssize_t apb_log_read(struct file *f, char __user *buf, |
| size_t count, loff_t *ppos) |
| { |
| struct es2_ap_dev *es2 = file_inode(f)->i_private; |
| ssize_t ret; |
| size_t copied; |
| char *tmp_buf; |
| |
| if (count > APB1_LOG_SIZE) |
| count = APB1_LOG_SIZE; |
| |
| tmp_buf = kmalloc(count, GFP_KERNEL); |
| if (!tmp_buf) |
| return -ENOMEM; |
| |
| copied = kfifo_out(&es2->apb_log_fifo, tmp_buf, count); |
| ret = simple_read_from_buffer(buf, count, ppos, tmp_buf, copied); |
| |
| kfree(tmp_buf); |
| |
| return ret; |
| } |
| |
| static const struct file_operations apb_log_fops = { |
| .read = apb_log_read, |
| }; |
| |
| static void usb_log_enable(struct es2_ap_dev *es2) |
| { |
| if (!IS_ERR_OR_NULL(es2->apb_log_task)) |
| return; |
| |
| /* get log from APB1 */ |
| es2->apb_log_task = kthread_run(apb_log_poll, es2, "apb_log"); |
| if (IS_ERR(es2->apb_log_task)) |
| return; |
| /* XXX We will need to rename this per APB */ |
| es2->apb_log_dentry = debugfs_create_file("apb_log", 0444, |
| gb_debugfs_get(), es2, |
| &apb_log_fops); |
| } |
| |
| static void usb_log_disable(struct es2_ap_dev *es2) |
| { |
| if (IS_ERR_OR_NULL(es2->apb_log_task)) |
| return; |
| |
| debugfs_remove(es2->apb_log_dentry); |
| es2->apb_log_dentry = NULL; |
| |
| kthread_stop(es2->apb_log_task); |
| es2->apb_log_task = NULL; |
| } |
| |
| static ssize_t apb_log_enable_read(struct file *f, char __user *buf, |
| size_t count, loff_t *ppos) |
| { |
| struct es2_ap_dev *es2 = file_inode(f)->i_private; |
| int enable = !IS_ERR_OR_NULL(es2->apb_log_task); |
| char tmp_buf[3]; |
| |
| sprintf(tmp_buf, "%d\n", enable); |
| return simple_read_from_buffer(buf, count, ppos, tmp_buf, 2); |
| } |
| |
| static ssize_t apb_log_enable_write(struct file *f, const char __user *buf, |
| size_t count, loff_t *ppos) |
| { |
| int enable; |
| ssize_t retval; |
| struct es2_ap_dev *es2 = file_inode(f)->i_private; |
| |
| retval = kstrtoint_from_user(buf, count, 10, &enable); |
| if (retval) |
| return retval; |
| |
| if (enable) |
| usb_log_enable(es2); |
| else |
| usb_log_disable(es2); |
| |
| return count; |
| } |
| |
| static const struct file_operations apb_log_enable_fops = { |
| .read = apb_log_enable_read, |
| .write = apb_log_enable_write, |
| }; |
| |
| static int apb_get_cport_count(struct usb_device *udev) |
| { |
| int retval; |
| __le16 *cport_count; |
| |
| cport_count = kzalloc(sizeof(*cport_count), GFP_KERNEL); |
| if (!cport_count) |
| return -ENOMEM; |
| |
| retval = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0), |
| GB_APB_REQUEST_CPORT_COUNT, |
| USB_DIR_IN | USB_TYPE_VENDOR | |
| USB_RECIP_INTERFACE, 0, 0, cport_count, |
| sizeof(*cport_count), ES2_USB_CTRL_TIMEOUT); |
| if (retval != sizeof(*cport_count)) { |
| dev_err(&udev->dev, "Cannot retrieve CPort count: %d\n", |
| retval); |
| |
| if (retval >= 0) |
| retval = -EIO; |
| |
| goto out; |
| } |
| |
| retval = le16_to_cpu(*cport_count); |
| |
| /* We need to fit a CPort ID in one byte of a message header */ |
| if (retval > U8_MAX) { |
| retval = U8_MAX; |
| dev_warn(&udev->dev, "Limiting number of CPorts to U8_MAX\n"); |
| } |
| |
| out: |
| kfree(cport_count); |
| return retval; |
| } |
| |
| /* |
| * The ES2 USB Bridge device has 15 endpoints |
| * 1 Control - usual USB stuff + AP -> APBridgeA messages |
| * 7 Bulk IN - CPort data in |
| * 7 Bulk OUT - CPort data out |
| */ |
| static int ap_probe(struct usb_interface *interface, |
| const struct usb_device_id *id) |
| { |
| struct es2_ap_dev *es2; |
| struct gb_host_device *hd; |
| struct usb_device *udev; |
| struct usb_host_interface *iface_desc; |
| struct usb_endpoint_descriptor *endpoint; |
| __u8 ep_addr; |
| int retval; |
| int i; |
| int num_cports; |
| bool bulk_out_found = false; |
| bool bulk_in_found = false; |
| bool arpc_in_found = false; |
| |
| udev = usb_get_dev(interface_to_usbdev(interface)); |
| |
| num_cports = apb_get_cport_count(udev); |
| if (num_cports < 0) { |
| usb_put_dev(udev); |
| dev_err(&udev->dev, "Cannot retrieve CPort count: %d\n", |
| num_cports); |
| return num_cports; |
| } |
| |
| hd = gb_hd_create(&es2_driver, &udev->dev, ES2_GBUF_MSG_SIZE_MAX, |
| num_cports); |
| if (IS_ERR(hd)) { |
| usb_put_dev(udev); |
| return PTR_ERR(hd); |
| } |
| |
| es2 = hd_to_es2(hd); |
| es2->hd = hd; |
| es2->usb_intf = interface; |
| es2->usb_dev = udev; |
| spin_lock_init(&es2->cport_out_urb_lock); |
| INIT_KFIFO(es2->apb_log_fifo); |
| usb_set_intfdata(interface, es2); |
| |
| /* |
| * Reserve the CDSI0 and CDSI1 CPorts so they won't be allocated |
| * dynamically. |
| */ |
| retval = gb_hd_cport_reserve(hd, ES2_CPORT_CDSI0); |
| if (retval) |
| goto error; |
| retval = gb_hd_cport_reserve(hd, ES2_CPORT_CDSI1); |
| if (retval) |
| goto error; |
| |
| /* find all bulk endpoints */ |
| iface_desc = interface->cur_altsetting; |
| for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) { |
| endpoint = &iface_desc->endpoint[i].desc; |
| ep_addr = endpoint->bEndpointAddress; |
| |
| if (usb_endpoint_is_bulk_in(endpoint)) { |
| if (!bulk_in_found) { |
| es2->cport_in.endpoint = ep_addr; |
| bulk_in_found = true; |
| } else if (!arpc_in_found) { |
| es2->arpc_endpoint_in = ep_addr; |
| arpc_in_found = true; |
| } else { |
| dev_warn(&udev->dev, |
| "Unused bulk IN endpoint found: 0x%02x\n", |
| ep_addr); |
| } |
| continue; |
| } |
| if (usb_endpoint_is_bulk_out(endpoint)) { |
| if (!bulk_out_found) { |
| es2->cport_out_endpoint = ep_addr; |
| bulk_out_found = true; |
| } else { |
| dev_warn(&udev->dev, |
| "Unused bulk OUT endpoint found: 0x%02x\n", |
| ep_addr); |
| } |
| continue; |
| } |
| dev_warn(&udev->dev, |
| "Unknown endpoint type found, address 0x%02x\n", |
| ep_addr); |
| } |
| if (!bulk_in_found || !arpc_in_found || !bulk_out_found) { |
| dev_err(&udev->dev, "Not enough endpoints found in device, aborting!\n"); |
| retval = -ENODEV; |
| goto error; |
| } |
| |
| /* Allocate buffers for our cport in messages */ |
| for (i = 0; i < NUM_CPORT_IN_URB; ++i) { |
| struct urb *urb; |
| u8 *buffer; |
| |
| urb = usb_alloc_urb(0, GFP_KERNEL); |
| if (!urb) { |
| retval = -ENOMEM; |
| goto error; |
| } |
| es2->cport_in.urb[i] = urb; |
| |
| buffer = kmalloc(ES2_GBUF_MSG_SIZE_MAX, GFP_KERNEL); |
| if (!buffer) { |
| retval = -ENOMEM; |
| goto error; |
| } |
| |
| usb_fill_bulk_urb(urb, udev, |
| usb_rcvbulkpipe(udev, es2->cport_in.endpoint), |
| buffer, ES2_GBUF_MSG_SIZE_MAX, |
| cport_in_callback, hd); |
| |
| es2->cport_in.buffer[i] = buffer; |
| } |
| |
| /* Allocate buffers for ARPC in messages */ |
| for (i = 0; i < NUM_ARPC_IN_URB; ++i) { |
| struct urb *urb; |
| u8 *buffer; |
| |
| urb = usb_alloc_urb(0, GFP_KERNEL); |
| if (!urb) { |
| retval = -ENOMEM; |
| goto error; |
| } |
| es2->arpc_urb[i] = urb; |
| |
| buffer = kmalloc(ARPC_IN_SIZE_MAX, GFP_KERNEL); |
| if (!buffer) { |
| retval = -ENOMEM; |
| goto error; |
| } |
| |
| usb_fill_bulk_urb(urb, udev, |
| usb_rcvbulkpipe(udev, |
| es2->arpc_endpoint_in), |
| buffer, ARPC_IN_SIZE_MAX, |
| arpc_in_callback, es2); |
| |
| es2->arpc_buffer[i] = buffer; |
| } |
| |
| /* Allocate urbs for our CPort OUT messages */ |
| for (i = 0; i < NUM_CPORT_OUT_URB; ++i) { |
| struct urb *urb; |
| |
| urb = usb_alloc_urb(0, GFP_KERNEL); |
| if (!urb) { |
| retval = -ENOMEM; |
| goto error; |
| } |
| |
| es2->cport_out_urb[i] = urb; |
| es2->cport_out_urb_busy[i] = false; /* just to be anal */ |
| } |
| |
| /* XXX We will need to rename this per APB */ |
| es2->apb_log_enable_dentry = debugfs_create_file("apb_log_enable", |
| 0644, |
| gb_debugfs_get(), es2, |
| &apb_log_enable_fops); |
| |
| INIT_LIST_HEAD(&es2->arpcs); |
| spin_lock_init(&es2->arpc_lock); |
| |
| retval = es2_arpc_in_enable(es2); |
| if (retval) |
| goto error; |
| |
| retval = gb_hd_add(hd); |
| if (retval) |
| goto err_disable_arpc_in; |
| |
| retval = es2_cport_in_enable(es2, &es2->cport_in); |
| if (retval) |
| goto err_hd_del; |
| |
| return 0; |
| |
| err_hd_del: |
| gb_hd_del(hd); |
| err_disable_arpc_in: |
| es2_arpc_in_disable(es2); |
| error: |
| es2_destroy(es2); |
| |
| return retval; |
| } |
| |
| static void ap_disconnect(struct usb_interface *interface) |
| { |
| struct es2_ap_dev *es2 = usb_get_intfdata(interface); |
| |
| gb_hd_del(es2->hd); |
| |
| es2_cport_in_disable(es2, &es2->cport_in); |
| es2_arpc_in_disable(es2); |
| |
| es2_destroy(es2); |
| } |
| |
| static struct usb_driver es2_ap_driver = { |
| .name = "es2_ap_driver", |
| .probe = ap_probe, |
| .disconnect = ap_disconnect, |
| .id_table = id_table, |
| .soft_unbind = 1, |
| }; |
| |
| module_usb_driver(es2_ap_driver); |
| |
| MODULE_DESCRIPTION("Greybus AP USB driver for ES2 controller chips"); |
| MODULE_LICENSE("GPL v2"); |
| MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@linuxfoundation.org>"); |