1051 lines
25 KiB
C
1051 lines
25 KiB
C
/*
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* Greybus "AP" USB driver for "ES2" controller chips
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*
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* Copyright 2014-2015 Google Inc.
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* Copyright 2014-2015 Linaro Ltd.
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*
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* Released under the GPLv2 only.
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*/
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#include <linux/kthread.h>
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#include <linux/sizes.h>
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#include <linux/usb.h>
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#include <linux/kfifo.h>
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#include <linux/debugfs.h>
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#include <asm/unaligned.h>
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#include "greybus.h"
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#include "kernel_ver.h"
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#include "connection.h"
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#include "greybus_trace.h"
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/* Memory sizes for the buffers sent to/from the ES2 controller */
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#define ES2_GBUF_MSG_SIZE_MAX 2048
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static const struct usb_device_id id_table[] = {
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{ USB_DEVICE(0x18d1, 0x1eaf) },
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{ },
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};
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MODULE_DEVICE_TABLE(usb, id_table);
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#define APB1_LOG_SIZE SZ_16K
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/* Number of bulk in and bulk out couple */
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#define NUM_BULKS 7
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/*
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* Number of CPort IN urbs in flight at any point in time.
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* Adjust if we are having stalls in the USB buffer due to not enough urbs in
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* flight.
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*/
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#define NUM_CPORT_IN_URB 4
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/* Number of CPort OUT urbs in flight at any point in time.
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* Adjust if we get messages saying we are out of urbs in the system log.
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*/
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#define NUM_CPORT_OUT_URB (8 * NUM_BULKS)
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/*
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* @endpoint: bulk in endpoint for CPort data
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* @urb: array of urbs for the CPort in messages
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* @buffer: array of buffers for the @cport_in_urb urbs
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*/
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struct es2_cport_in {
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__u8 endpoint;
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struct urb *urb[NUM_CPORT_IN_URB];
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u8 *buffer[NUM_CPORT_IN_URB];
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};
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/*
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* @endpoint: bulk out endpoint for CPort data
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*/
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struct es2_cport_out {
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__u8 endpoint;
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};
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/**
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* es2_ap_dev - ES2 USB Bridge to AP structure
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* @usb_dev: pointer to the USB device we are.
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* @usb_intf: pointer to the USB interface we are bound to.
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* @hd: pointer to our gb_host_device structure
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* @cport_in: endpoint, urbs and buffer for cport in messages
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* @cport_out: endpoint for for cport out messages
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* @cport_out_urb: array of urbs for the CPort out messages
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* @cport_out_urb_busy: array of flags to see if the @cport_out_urb is busy or
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* not.
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* @cport_out_urb_cancelled: array of flags indicating whether the
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* corresponding @cport_out_urb is being cancelled
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* @cport_out_urb_lock: locks the @cport_out_urb_busy "list"
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*
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* @apb_log_task: task pointer for logging thread
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* @apb_log_dentry: file system entry for the log file interface
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* @apb_log_enable_dentry: file system entry for enabling logging
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* @apb_log_fifo: kernel FIFO to carry logged data
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*/
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struct es2_ap_dev {
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struct usb_device *usb_dev;
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struct usb_interface *usb_intf;
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struct gb_host_device *hd;
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struct es2_cport_in cport_in[NUM_BULKS];
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struct es2_cport_out cport_out[NUM_BULKS];
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struct urb *cport_out_urb[NUM_CPORT_OUT_URB];
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bool cport_out_urb_busy[NUM_CPORT_OUT_URB];
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bool cport_out_urb_cancelled[NUM_CPORT_OUT_URB];
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spinlock_t cport_out_urb_lock;
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int *cport_to_ep;
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struct task_struct *apb_log_task;
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struct dentry *apb_log_dentry;
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struct dentry *apb_log_enable_dentry;
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DECLARE_KFIFO(apb_log_fifo, char, APB1_LOG_SIZE);
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};
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/**
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* cport_to_ep - information about cport to endpoints mapping
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* @cport_id: the id of cport to map to endpoints
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* @endpoint_in: the endpoint number to use for in transfer
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* @endpoint_out: he endpoint number to use for out transfer
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*/
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struct cport_to_ep {
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__le16 cport_id;
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__u8 endpoint_in;
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__u8 endpoint_out;
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};
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static inline struct es2_ap_dev *hd_to_es2(struct gb_host_device *hd)
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{
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return (struct es2_ap_dev *)&hd->hd_priv;
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}
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static void cport_out_callback(struct urb *urb);
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static void usb_log_enable(struct es2_ap_dev *es2);
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static void usb_log_disable(struct es2_ap_dev *es2);
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/* Get the endpoints pair mapped to the cport */
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static int cport_to_ep_pair(struct es2_ap_dev *es2, u16 cport_id)
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{
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if (cport_id >= es2->hd->num_cports)
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return 0;
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return es2->cport_to_ep[cport_id];
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}
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#define ES2_TIMEOUT 500 /* 500 ms for the SVC to do something */
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/* Disable for now until we work all of this out to keep a warning-free build */
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#if 0
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/* Test if the endpoints pair is already mapped to a cport */
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static int ep_pair_in_use(struct es2_ap_dev *es2, int ep_pair)
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{
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int i;
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for (i = 0; i < es2->hd->num_cports; i++) {
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if (es2->cport_to_ep[i] == ep_pair)
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return 1;
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}
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return 0;
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}
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/* Configure the endpoint mapping and send the request to APBridge */
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static int map_cport_to_ep(struct es2_ap_dev *es2,
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u16 cport_id, int ep_pair)
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{
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int retval;
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struct cport_to_ep *cport_to_ep;
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if (ep_pair < 0 || ep_pair >= NUM_BULKS)
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return -EINVAL;
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if (cport_id >= es2->hd->num_cports)
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return -EINVAL;
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if (ep_pair && ep_pair_in_use(es2, ep_pair))
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return -EINVAL;
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cport_to_ep = kmalloc(sizeof(*cport_to_ep), GFP_KERNEL);
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if (!cport_to_ep)
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return -ENOMEM;
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es2->cport_to_ep[cport_id] = ep_pair;
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cport_to_ep->cport_id = cpu_to_le16(cport_id);
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cport_to_ep->endpoint_in = es2->cport_in[ep_pair].endpoint;
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cport_to_ep->endpoint_out = es2->cport_out[ep_pair].endpoint;
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retval = usb_control_msg(es2->usb_dev,
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usb_sndctrlpipe(es2->usb_dev, 0),
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GB_APB_REQUEST_EP_MAPPING,
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USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
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0x00, 0x00,
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(char *)cport_to_ep,
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sizeof(*cport_to_ep),
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ES2_TIMEOUT);
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if (retval == sizeof(*cport_to_ep))
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retval = 0;
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kfree(cport_to_ep);
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return retval;
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}
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/* Unmap a cport: use the muxed endpoints pair */
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static int unmap_cport(struct es2_ap_dev *es2, u16 cport_id)
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{
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return map_cport_to_ep(es2, cport_id, 0);
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}
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#endif
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static int output_sync(struct es2_ap_dev *es2, void *req, u16 size, u8 cmd)
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{
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struct usb_device *udev = es2->usb_dev;
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u8 *data;
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int retval;
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data = kmalloc(size, GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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memcpy(data, req, size);
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retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
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cmd,
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USB_DIR_OUT | USB_TYPE_VENDOR |
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USB_RECIP_INTERFACE,
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0, 0, data, size, ES2_TIMEOUT);
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if (retval < 0)
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dev_err(&udev->dev, "%s: return error %d\n", __func__, retval);
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else
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retval = 0;
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kfree(data);
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return retval;
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}
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static void ap_urb_complete(struct urb *urb)
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{
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struct usb_ctrlrequest *dr = urb->context;
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kfree(dr);
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usb_free_urb(urb);
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}
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static int output_async(struct es2_ap_dev *es2, void *req, u16 size, u8 cmd)
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{
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struct usb_device *udev = es2->usb_dev;
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struct urb *urb;
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struct usb_ctrlrequest *dr;
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u8 *buf;
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int retval;
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urb = usb_alloc_urb(0, GFP_ATOMIC);
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if (!urb)
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return -ENOMEM;
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dr = kmalloc(sizeof(*dr) + size, GFP_ATOMIC);
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if (!dr) {
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usb_free_urb(urb);
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return -ENOMEM;
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}
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buf = (u8 *)dr + sizeof(*dr);
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memcpy(buf, req, size);
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dr->bRequest = cmd;
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dr->bRequestType = USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE;
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dr->wValue = 0;
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dr->wIndex = 0;
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dr->wLength = cpu_to_le16(size);
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usb_fill_control_urb(urb, udev, usb_sndctrlpipe(udev, 0),
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(unsigned char *)dr, buf, size,
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ap_urb_complete, dr);
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retval = usb_submit_urb(urb, GFP_ATOMIC);
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if (retval) {
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usb_free_urb(urb);
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kfree(dr);
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}
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return retval;
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}
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static int output(struct gb_host_device *hd, void *req, u16 size, u8 cmd,
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bool async)
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{
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struct es2_ap_dev *es2 = hd_to_es2(hd);
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if (async)
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return output_async(es2, req, size, cmd);
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return output_sync(es2, req, size, cmd);
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}
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static int es2_cport_in_enable(struct es2_ap_dev *es2,
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struct es2_cport_in *cport_in)
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{
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struct urb *urb;
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int ret;
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int i;
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for (i = 0; i < NUM_CPORT_IN_URB; ++i) {
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urb = cport_in->urb[i];
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ret = usb_submit_urb(urb, GFP_KERNEL);
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if (ret) {
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dev_err(&es2->usb_dev->dev,
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"failed to submit in-urb: %d\n", ret);
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goto err_kill_urbs;
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}
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}
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return 0;
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err_kill_urbs:
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for (--i; i >= 0; --i) {
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urb = cport_in->urb[i];
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usb_kill_urb(urb);
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}
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return ret;
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}
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static void es2_cport_in_disable(struct es2_ap_dev *es2,
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struct es2_cport_in *cport_in)
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{
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struct urb *urb;
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int i;
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for (i = 0; i < NUM_CPORT_IN_URB; ++i) {
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urb = cport_in->urb[i];
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usb_kill_urb(urb);
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}
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}
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static struct urb *next_free_urb(struct es2_ap_dev *es2, gfp_t gfp_mask)
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{
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struct urb *urb = NULL;
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unsigned long flags;
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int i;
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spin_lock_irqsave(&es2->cport_out_urb_lock, flags);
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/* Look in our pool of allocated urbs first, as that's the "fastest" */
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for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
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if (es2->cport_out_urb_busy[i] == false &&
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es2->cport_out_urb_cancelled[i] == false) {
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es2->cport_out_urb_busy[i] = true;
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urb = es2->cport_out_urb[i];
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break;
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}
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}
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spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags);
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if (urb)
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return urb;
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/*
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* Crap, pool is empty, complain to the syslog and go allocate one
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* dynamically as we have to succeed.
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*/
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dev_dbg(&es2->usb_dev->dev,
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"No free CPort OUT urbs, having to dynamically allocate one!\n");
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return usb_alloc_urb(0, gfp_mask);
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}
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static void free_urb(struct es2_ap_dev *es2, struct urb *urb)
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{
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unsigned long flags;
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int i;
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/*
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* See if this was an urb in our pool, if so mark it "free", otherwise
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* we need to free it ourselves.
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*/
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spin_lock_irqsave(&es2->cport_out_urb_lock, flags);
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for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
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if (urb == es2->cport_out_urb[i]) {
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es2->cport_out_urb_busy[i] = false;
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urb = NULL;
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break;
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}
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}
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spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags);
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/* If urb is not NULL, then we need to free this urb */
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usb_free_urb(urb);
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}
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/*
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* We (ab)use the operation-message header pad bytes to transfer the
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* cport id in order to minimise overhead.
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*/
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static void
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gb_message_cport_pack(struct gb_operation_msg_hdr *header, u16 cport_id)
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{
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header->pad[0] = cport_id;
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}
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/* Clear the pad bytes used for the CPort id */
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static void gb_message_cport_clear(struct gb_operation_msg_hdr *header)
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{
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header->pad[0] = 0;
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}
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/* Extract the CPort id packed into the header, and clear it */
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static u16 gb_message_cport_unpack(struct gb_operation_msg_hdr *header)
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{
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u16 cport_id = header->pad[0];
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gb_message_cport_clear(header);
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return cport_id;
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}
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/*
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* Returns zero if the message was successfully queued, or a negative errno
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* otherwise.
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*/
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static int message_send(struct gb_host_device *hd, u16 cport_id,
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struct gb_message *message, gfp_t gfp_mask)
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{
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struct es2_ap_dev *es2 = hd_to_es2(hd);
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struct usb_device *udev = es2->usb_dev;
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size_t buffer_size;
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int retval;
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struct urb *urb;
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int ep_pair;
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unsigned long flags;
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/*
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* The data actually transferred will include an indication
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* of where the data should be sent. Do one last check of
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* the target CPort id before filling it in.
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*/
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if (!cport_id_valid(hd, cport_id)) {
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dev_err(&udev->dev, "invalid cport %u\n", cport_id);
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return -EINVAL;
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}
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/* Find a free urb */
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urb = next_free_urb(es2, gfp_mask);
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if (!urb)
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return -ENOMEM;
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spin_lock_irqsave(&es2->cport_out_urb_lock, flags);
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message->hcpriv = urb;
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spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags);
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/* Pack the cport id into the message header */
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gb_message_cport_pack(message->header, cport_id);
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buffer_size = sizeof(*message->header) + message->payload_size;
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ep_pair = cport_to_ep_pair(es2, cport_id);
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usb_fill_bulk_urb(urb, udev,
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usb_sndbulkpipe(udev,
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es2->cport_out[ep_pair].endpoint),
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message->buffer, buffer_size,
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cport_out_callback, message);
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urb->transfer_flags |= URB_ZERO_PACKET;
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trace_gb_host_device_send(hd, cport_id, buffer_size);
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retval = usb_submit_urb(urb, gfp_mask);
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if (retval) {
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dev_err(&udev->dev, "failed to submit out-urb: %d\n", retval);
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|
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spin_lock_irqsave(&es2->cport_out_urb_lock, flags);
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message->hcpriv = NULL;
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spin_unlock_irqrestore(&es2->cport_out_urb_lock, flags);
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free_urb(es2, urb);
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gb_message_cport_clear(message->header);
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return retval;
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}
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return 0;
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}
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|
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/*
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* Can not be called in atomic context.
|
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*/
|
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static void message_cancel(struct gb_message *message)
|
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{
|
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struct gb_host_device *hd = message->operation->connection->hd;
|
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struct es2_ap_dev *es2 = hd_to_es2(hd);
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struct urb *urb;
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int i;
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|
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might_sleep();
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|
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spin_lock_irq(&es2->cport_out_urb_lock);
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urb = message->hcpriv;
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|
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/* Prevent dynamically allocated urb from being deallocated. */
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usb_get_urb(urb);
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|
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/* Prevent pre-allocated urb from being reused. */
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for (i = 0; i < NUM_CPORT_OUT_URB; ++i) {
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if (urb == es2->cport_out_urb[i]) {
|
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es2->cport_out_urb_cancelled[i] = true;
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break;
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}
|
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}
|
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spin_unlock_irq(&es2->cport_out_urb_lock);
|
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|
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usb_kill_urb(urb);
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|
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if (i < NUM_CPORT_OUT_URB) {
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spin_lock_irq(&es2->cport_out_urb_lock);
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es2->cport_out_urb_cancelled[i] = false;
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spin_unlock_irq(&es2->cport_out_urb_lock);
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}
|
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|
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usb_free_urb(urb);
|
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}
|
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|
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static int cport_reset(struct gb_host_device *hd, u16 cport_id)
|
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{
|
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struct es2_ap_dev *es2 = hd_to_es2(hd);
|
|
struct usb_device *udev = es2->usb_dev;
|
|
int retval;
|
|
|
|
retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
|
|
GB_APB_REQUEST_RESET_CPORT,
|
|
USB_DIR_OUT | USB_TYPE_VENDOR |
|
|
USB_RECIP_INTERFACE, cport_id, 0,
|
|
NULL, 0, ES2_TIMEOUT);
|
|
if (retval < 0) {
|
|
dev_err(&udev->dev, "failed to reset cport %u: %d\n", cport_id,
|
|
retval);
|
|
return retval;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int cport_enable(struct gb_host_device *hd, u16 cport_id)
|
|
{
|
|
int retval;
|
|
|
|
if (cport_id != GB_SVC_CPORT_ID) {
|
|
retval = cport_reset(hd, cport_id);
|
|
if (retval)
|
|
return retval;
|
|
}
|
|
|
|
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;
|
|
|
|
if (!cport_id_valid(hd, cport_id)) {
|
|
dev_err(&udev->dev, "invalid cport %u\n", cport_id);
|
|
return -EINVAL;
|
|
}
|
|
|
|
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_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;
|
|
|
|
if (!cport_id_valid(hd, cport_id)) {
|
|
dev_err(&udev->dev, "invalid cport %u\n", cport_id);
|
|
return -EINVAL;
|
|
}
|
|
|
|
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_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_enable = cport_enable,
|
|
.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);
|
|
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;
|
|
int bulk_in;
|
|
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) {
|
|
struct urb *urb = es2->cport_out_urb[i];
|
|
|
|
if (!urb)
|
|
break;
|
|
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 (bulk_in = 0; bulk_in < NUM_BULKS; bulk_in++) {
|
|
struct es2_cport_in *cport_in = &es2->cport_in[bulk_in];
|
|
|
|
for (i = 0; i < NUM_CPORT_IN_URB; ++i) {
|
|
struct urb *urb = cport_in->urb[i];
|
|
|
|
if (!urb)
|
|
break;
|
|
usb_free_urb(urb);
|
|
kfree(cport_in->buffer[i]);
|
|
cport_in->buffer[i] = NULL;
|
|
}
|
|
}
|
|
|
|
kfree(es2->cport_to_ep);
|
|
|
|
udev = es2->usb_dev;
|
|
gb_hd_put(es2->hd);
|
|
|
|
usb_put_dev(udev);
|
|
}
|
|
|
|
static void ap_disconnect(struct usb_interface *interface)
|
|
{
|
|
struct es2_ap_dev *es2 = usb_get_intfdata(interface);
|
|
int i;
|
|
|
|
for (i = 0; i < NUM_BULKS; ++i)
|
|
es2_cport_in_disable(es2, &es2->cport_in[i]);
|
|
|
|
gb_hd_del(es2->hd);
|
|
|
|
es2_destroy(es2);
|
|
}
|
|
|
|
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;
|
|
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)) {
|
|
trace_gb_host_device_recv(hd, cport_id, urb->actual_length);
|
|
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);
|
|
}
|
|
|
|
#define APB1_LOG_MSG_SIZE 64
|
|
static void apb_log_get(struct es2_ap_dev *es2, char *buf)
|
|
{
|
|
int retval;
|
|
|
|
/* SVC messages go down our control pipe */
|
|
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_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 = f->f_inode->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", S_IRUGO,
|
|
gb_debugfs_get(), NULL,
|
|
&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 = f->f_inode->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, 3);
|
|
}
|
|
|
|
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 = f->f_inode->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 = kmalloc(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_TIMEOUT);
|
|
if (retval < 0) {
|
|
dev_err(&udev->dev, "Cannot retrieve CPort count: %d\n",
|
|
retval);
|
|
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;
|
|
int bulk_in = 0;
|
|
int bulk_out = 0;
|
|
int retval = -ENOMEM;
|
|
int i;
|
|
int num_cports;
|
|
int cport_id;
|
|
|
|
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);
|
|
}
|
|
|
|
/*
|
|
* CPorts 16 and 17 are reserved for CDSI0 and CDSI1, make sure they
|
|
* won't be allocated dynamically.
|
|
*/
|
|
do {
|
|
cport_id = ida_simple_get(&hd->cport_id_map, 16, 18, GFP_KERNEL);
|
|
} while (cport_id > 0);
|
|
|
|
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);
|
|
|
|
es2->cport_to_ep = kcalloc(hd->num_cports, sizeof(*es2->cport_to_ep),
|
|
GFP_KERNEL);
|
|
if (!es2->cport_to_ep) {
|
|
retval = -ENOMEM;
|
|
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;
|
|
|
|
if (usb_endpoint_is_bulk_in(endpoint)) {
|
|
es2->cport_in[bulk_in++].endpoint =
|
|
endpoint->bEndpointAddress;
|
|
} else if (usb_endpoint_is_bulk_out(endpoint)) {
|
|
es2->cport_out[bulk_out++].endpoint =
|
|
endpoint->bEndpointAddress;
|
|
} else {
|
|
dev_err(&udev->dev,
|
|
"Unknown endpoint type found, address 0x%02x\n",
|
|
endpoint->bEndpointAddress);
|
|
}
|
|
}
|
|
if (bulk_in != NUM_BULKS || bulk_out != NUM_BULKS) {
|
|
dev_err(&udev->dev, "Not enough endpoints found in device, aborting!\n");
|
|
goto error;
|
|
}
|
|
|
|
/* Allocate buffers for our cport in messages */
|
|
for (bulk_in = 0; bulk_in < NUM_BULKS; bulk_in++) {
|
|
struct es2_cport_in *cport_in = &es2->cport_in[bulk_in];
|
|
|
|
for (i = 0; i < NUM_CPORT_IN_URB; ++i) {
|
|
struct urb *urb;
|
|
u8 *buffer;
|
|
|
|
urb = usb_alloc_urb(0, GFP_KERNEL);
|
|
if (!urb)
|
|
goto error;
|
|
buffer = kmalloc(ES2_GBUF_MSG_SIZE_MAX, GFP_KERNEL);
|
|
if (!buffer)
|
|
goto error;
|
|
|
|
usb_fill_bulk_urb(urb, udev,
|
|
usb_rcvbulkpipe(udev,
|
|
cport_in->endpoint),
|
|
buffer, ES2_GBUF_MSG_SIZE_MAX,
|
|
cport_in_callback, hd);
|
|
cport_in->urb[i] = urb;
|
|
cport_in->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)
|
|
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",
|
|
(S_IWUSR | S_IRUGO),
|
|
gb_debugfs_get(), es2,
|
|
&apb_log_enable_fops);
|
|
|
|
retval = gb_hd_add(hd);
|
|
if (retval)
|
|
goto error;
|
|
|
|
for (i = 0; i < NUM_BULKS; ++i) {
|
|
retval = es2_cport_in_enable(es2, &es2->cport_in[i]);
|
|
if (retval)
|
|
goto err_disable_cport_in;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_disable_cport_in:
|
|
for (--i; i >= 0; --i)
|
|
es2_cport_in_disable(es2, &es2->cport_in[i]);
|
|
gb_hd_del(hd);
|
|
error:
|
|
es2_destroy(es2);
|
|
|
|
return retval;
|
|
}
|
|
|
|
static struct usb_driver es2_ap_driver = {
|
|
.name = "es2_ap_driver",
|
|
.probe = ap_probe,
|
|
.disconnect = ap_disconnect,
|
|
.id_table = id_table,
|
|
};
|
|
|
|
module_usb_driver(es2_ap_driver);
|
|
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_AUTHOR("Greg Kroah-Hartman <gregkh@linuxfoundation.org>");
|