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es2.c
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es2.c
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/*
* Greybus "AP" USB driver for "ES2" controller chips
*
* Copyright 2014-2015 Google Inc.
* Copyright 2014-2015 Linaro Ltd.
*
* Released under the GPLv2 only.
*/
#include <linux/kthread.h>
#include <linux/sizes.h>
#include <linux/usb.h>
#include <linux/kfifo.h>
#include <linux/debugfs.h>
#include <asm/unaligned.h>
#include "greybus.h"
#include "kernel_ver.h"
#include "connection.h"
#include "greybus_trace.h"
/* Memory sizes for the buffers sent to/from the ES2 controller */
#define ES2_GBUF_MSG_SIZE_MAX 2048
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 bulk in and bulk out couple */
#define NUM_BULKS 7
/*
* 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 * NUM_BULKS)
/*
* @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];
};
/*
* @endpoint: bulk out endpoint for CPort data
*/
struct es2_cport_out {
__u8 endpoint;
};
/**
* 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 for 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"
*
* @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
*/
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[NUM_BULKS];
struct es2_cport_out cport_out[NUM_BULKS];
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;
int *cport_to_ep;
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);
};
/**
* cport_to_ep - information about cport to endpoints mapping
* @cport_id: the id of cport to map to endpoints
* @endpoint_in: the endpoint number to use for in transfer
* @endpoint_out: he endpoint number to use for out transfer
*/
struct cport_to_ep {
__le16 cport_id;
__u8 endpoint_in;
__u8 endpoint_out;
};
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);
/* Get the endpoints pair mapped to the cport */
static int cport_to_ep_pair(struct es2_ap_dev *es2, u16 cport_id)
{
if (cport_id >= es2->hd->num_cports)
return 0;
return es2->cport_to_ep[cport_id];
}
#define ES2_TIMEOUT 500 /* 500 ms for the SVC to do something */
/* Disable for now until we work all of this out to keep a warning-free build */
#if 0
/* Test if the endpoints pair is already mapped to a cport */
static int ep_pair_in_use(struct es2_ap_dev *es2, int ep_pair)
{
int i;
for (i = 0; i < es2->hd->num_cports; i++) {
if (es2->cport_to_ep[i] == ep_pair)
return 1;
}
return 0;
}
/* Configure the endpoint mapping and send the request to APBridge */
static int map_cport_to_ep(struct es2_ap_dev *es2,
u16 cport_id, int ep_pair)
{
int retval;
struct cport_to_ep *cport_to_ep;
if (ep_pair < 0 || ep_pair >= NUM_BULKS)
return -EINVAL;
if (cport_id >= es2->hd->num_cports)
return -EINVAL;
if (ep_pair && ep_pair_in_use(es2, ep_pair))
return -EINVAL;
cport_to_ep = kmalloc(sizeof(*cport_to_ep), GFP_KERNEL);
if (!cport_to_ep)
return -ENOMEM;
es2->cport_to_ep[cport_id] = ep_pair;
cport_to_ep->cport_id = cpu_to_le16(cport_id);
cport_to_ep->endpoint_in = es2->cport_in[ep_pair].endpoint;
cport_to_ep->endpoint_out = es2->cport_out[ep_pair].endpoint;
retval = usb_control_msg(es2->usb_dev,
usb_sndctrlpipe(es2->usb_dev, 0),
GB_APB_REQUEST_EP_MAPPING,
USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_INTERFACE,
0x00, 0x00,
(char *)cport_to_ep,
sizeof(*cport_to_ep),
ES2_TIMEOUT);
if (retval == sizeof(*cport_to_ep))
retval = 0;
kfree(cport_to_ep);
return retval;
}
/* Unmap a cport: use the muxed endpoints pair */
static int unmap_cport(struct es2_ap_dev *es2, u16 cport_id)
{
return map_cport_to_ep(es2, cport_id, 0);
}
#endif
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 = kmalloc(size, GFP_KERNEL);
if (!data)
return -ENOMEM;
memcpy(data, req, size);
retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
cmd,
USB_DIR_OUT | USB_TYPE_VENDOR |
USB_RECIP_INTERFACE,
0, 0, data, size, ES2_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 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] == false &&
es2->cport_out_urb_cancelled[i] == false) {
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;
int ep_pair;
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;
ep_pair = cport_to_ep_pair(es2, cport_id);
usb_fill_bulk_urb(urb, udev,
usb_sndbulkpipe(udev,
es2->cport_out[ep_pair].endpoint),
message->buffer, buffer_size,
cport_out_callback, message);
urb->transfer_flags |= URB_ZERO_PACKET;
trace_gb_host_device_send(hd, cport_id, buffer_size);
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 cport_reset(struct gb_host_device *hd, u16 cport_id)
{
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 int cport_features_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_CPORT_FEAT_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 CPort features for cport %u: %d\n",
cport_id, retval);
return retval;
}
static int cport_features_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_CPORT_FEAT_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 CPort features for cport %u: %d\n",
cport_id, retval);
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,
.cport_features_enable = cport_features_enable,
.cport_features_disable = cport_features_disable,
};
/* 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 = 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_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;
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 =