pcan_usb_pro.c - Android社区 - https://www.androidos.net.cn/

Kernel | 3.14

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/*
 * CAN driver for PEAK System PCAN-USB Pro adapter
 * Derived from the PCAN project file driver/src/pcan_usbpro.c
 *
 * Copyright (C) 2003-2011 PEAK System-Technik GmbH
 * Copyright (C) 2011-2012 Stephane Grosjean <s.grosjean@peak-system.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published
 * by the Free Software Foundation; version 2 of the License.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 */
#include <linux/netdevice.h>
#include <linux/usb.h>
#include <linux/module.h>

#include <linux/can.h>
#include <linux/can/dev.h>
#include <linux/can/error.h>

#include "pcan_usb_core.h"
#include "pcan_usb_pro.h"

MODULE_SUPPORTED_DEVICE("PEAK-System PCAN-USB Pro adapter");

/* PCAN-USB Pro Endpoints */
#define PCAN_USBPRO_EP_CMDOUT		1
#define PCAN_USBPRO_EP_CMDIN		(PCAN_USBPRO_EP_CMDOUT | USB_DIR_IN)
#define PCAN_USBPRO_EP_MSGOUT_0		2
#define PCAN_USBPRO_EP_MSGIN		(PCAN_USBPRO_EP_MSGOUT_0 | USB_DIR_IN)
#define PCAN_USBPRO_EP_MSGOUT_1		3
#define PCAN_USBPRO_EP_UNUSED		(PCAN_USBPRO_EP_MSGOUT_1 | USB_DIR_IN)

#define PCAN_USBPRO_CHANNEL_COUNT	2

/* PCAN-USB Pro adapter internal clock (MHz) */
#define PCAN_USBPRO_CRYSTAL_HZ		56000000

/* PCAN-USB Pro command timeout (ms.) */
#define PCAN_USBPRO_COMMAND_TIMEOUT	1000

/* PCAN-USB Pro rx/tx buffers size */
#define PCAN_USBPRO_RX_BUFFER_SIZE	1024
#define PCAN_USBPRO_TX_BUFFER_SIZE	64

#define PCAN_USBPRO_MSG_HEADER_LEN	4

/* some commands responses need to be re-submitted */
#define PCAN_USBPRO_RSP_SUBMIT_MAX	2

#define PCAN_USBPRO_RTR			0x01
#define PCAN_USBPRO_EXT			0x02

#define PCAN_USBPRO_CMD_BUFFER_SIZE	512

/* handle device specific info used by the netdevices */
struct pcan_usb_pro_interface {
	struct peak_usb_device *dev[PCAN_USBPRO_CHANNEL_COUNT];
	struct peak_time_ref time_ref;
	int cm_ignore_count;
	int dev_opened_count;
};

/* device information */
struct pcan_usb_pro_device {
	struct peak_usb_device dev;
	struct pcan_usb_pro_interface *usb_if;
	u32 cached_ccbt;
};

/* internal structure used to handle messages sent to bulk urb */
struct pcan_usb_pro_msg {
	u8 *rec_ptr;
	int rec_buffer_size;
	int rec_buffer_len;
	union {
		u16 *rec_cnt_rd;
		u32 *rec_cnt;
		u8 *rec_buffer;
	} u;
};

/* records sizes table indexed on message id. (8-bits value) */
static u16 pcan_usb_pro_sizeof_rec[256] = {
	[PCAN_USBPRO_SETBTR] = sizeof(struct pcan_usb_pro_btr),
	[PCAN_USBPRO_SETBUSACT] = sizeof(struct pcan_usb_pro_busact),
	[PCAN_USBPRO_SETSILENT] = sizeof(struct pcan_usb_pro_silent),
	[PCAN_USBPRO_SETFILTR] = sizeof(struct pcan_usb_pro_filter),
	[PCAN_USBPRO_SETTS] = sizeof(struct pcan_usb_pro_setts),
	[PCAN_USBPRO_GETDEVID] = sizeof(struct pcan_usb_pro_devid),
	[PCAN_USBPRO_SETLED] = sizeof(struct pcan_usb_pro_setled),
	[PCAN_USBPRO_RXMSG8] = sizeof(struct pcan_usb_pro_rxmsg),
	[PCAN_USBPRO_RXMSG4] = sizeof(struct pcan_usb_pro_rxmsg) - 4,
	[PCAN_USBPRO_RXMSG0] = sizeof(struct pcan_usb_pro_rxmsg) - 8,
	[PCAN_USBPRO_RXRTR] = sizeof(struct pcan_usb_pro_rxmsg) - 8,
	[PCAN_USBPRO_RXSTATUS] = sizeof(struct pcan_usb_pro_rxstatus),
	[PCAN_USBPRO_RXTS] = sizeof(struct pcan_usb_pro_rxts),
	[PCAN_USBPRO_TXMSG8] = sizeof(struct pcan_usb_pro_txmsg),
	[PCAN_USBPRO_TXMSG4] = sizeof(struct pcan_usb_pro_txmsg) - 4,
	[PCAN_USBPRO_TXMSG0] = sizeof(struct pcan_usb_pro_txmsg) - 8,
};

/*
 * initialize PCAN-USB Pro message data structure
 */
static u8 *pcan_msg_init(struct pcan_usb_pro_msg *pm, void *buffer_addr,
			 int buffer_size)
{
	if (buffer_size < PCAN_USBPRO_MSG_HEADER_LEN)
		return NULL;

pm->u.rec_buffer = (u8 *)buffer_addr;
	pm->rec_buffer_size = pm->rec_buffer_len = buffer_size;
	pm->rec_ptr = pm->u.rec_buffer + PCAN_USBPRO_MSG_HEADER_LEN;

return pm->rec_ptr;
}

static u8 *pcan_msg_init_empty(struct pcan_usb_pro_msg *pm,
			       void *buffer_addr, int buffer_size)
{
	u8 *pr = pcan_msg_init(pm, buffer_addr, buffer_size);

if (pr) {
		pm->rec_buffer_len = PCAN_USBPRO_MSG_HEADER_LEN;
		*pm->u.rec_cnt = 0;
	}
	return pr;
}

/*
 * add one record to a message being built
 */
static int pcan_msg_add_rec(struct pcan_usb_pro_msg *pm, u8 id, ...)
{
	int len, i;
	u8 *pc;
	va_list ap;

va_start(ap, id);

pc = pm->rec_ptr + 1;

i = 0;
	switch (id) {
	case PCAN_USBPRO_TXMSG8:
		i += 4;
	case PCAN_USBPRO_TXMSG4:
		i += 4;
	case PCAN_USBPRO_TXMSG0:
		*pc++ = va_arg(ap, int);
		*pc++ = va_arg(ap, int);
		*pc++ = va_arg(ap, int);
		*(u32 *)pc = cpu_to_le32(va_arg(ap, u32));
		pc += 4;
		memcpy(pc, va_arg(ap, int *), i);
		pc += i;
		break;

case PCAN_USBPRO_SETBTR:
	case PCAN_USBPRO_GETDEVID:
		*pc++ = va_arg(ap, int);
		pc += 2;
		*(u32 *)pc = cpu_to_le32(va_arg(ap, u32));
		pc += 4;
		break;

case PCAN_USBPRO_SETFILTR:
	case PCAN_USBPRO_SETBUSACT:
	case PCAN_USBPRO_SETSILENT:
		*pc++ = va_arg(ap, int);
		*(u16 *)pc = cpu_to_le16(va_arg(ap, int));
		pc += 2;
		break;

case PCAN_USBPRO_SETLED:
		*pc++ = va_arg(ap, int);
		*(u16 *)pc = cpu_to_le16(va_arg(ap, int));
		pc += 2;
		*(u32 *)pc = cpu_to_le32(va_arg(ap, u32));
		pc += 4;
		break;

case PCAN_USBPRO_SETTS:
		pc++;
		*(u16 *)pc = cpu_to_le16(va_arg(ap, int));
		pc += 2;
		break;

default:
		pr_err("%s: %s(): unknown data type %02Xh (%d)\n",
			PCAN_USB_DRIVER_NAME, __func__, id, id);
		pc--;
		break;
	}

len = pc - pm->rec_ptr;
	if (len > 0) {
		*pm->u.rec_cnt = cpu_to_le32(*pm->u.rec_cnt+1);
		*pm->rec_ptr = id;

pm->rec_ptr = pc;
		pm->rec_buffer_len += len;
	}

va_end(ap);

return len;
}

/*
 * send PCAN-USB Pro command synchronously
 */
static int pcan_usb_pro_send_cmd(struct peak_usb_device *dev,
				 struct pcan_usb_pro_msg *pum)
{
	int actual_length;
	int err;

/* usb device unregistered? */
	if (!(dev->state & PCAN_USB_STATE_CONNECTED))
		return 0;

err = usb_bulk_msg(dev->udev,
		usb_sndbulkpipe(dev->udev, PCAN_USBPRO_EP_CMDOUT),
		pum->u.rec_buffer, pum->rec_buffer_len,
		&actual_length, PCAN_USBPRO_COMMAND_TIMEOUT);
	if (err)
		netdev_err(dev->netdev, "sending command failure: %d\n", err);

return err;
}

/*
 * wait for PCAN-USB Pro command response
 */
static int pcan_usb_pro_wait_rsp(struct peak_usb_device *dev,
				 struct pcan_usb_pro_msg *pum)
{
	u8 req_data_type, req_channel;
	int actual_length;
	int i, err = 0;

/* usb device unregistered? */
	if (!(dev->state & PCAN_USB_STATE_CONNECTED))
		return 0;

req_data_type = pum->u.rec_buffer[4];
	req_channel = pum->u.rec_buffer[5];

*pum->u.rec_cnt = 0;
	for (i = 0; !err && i < PCAN_USBPRO_RSP_SUBMIT_MAX; i++) {
		struct pcan_usb_pro_msg rsp;
		union pcan_usb_pro_rec *pr;
		u32 r, rec_cnt;
		u16 rec_len;
		u8 *pc;

err = usb_bulk_msg(dev->udev,
			usb_rcvbulkpipe(dev->udev, PCAN_USBPRO_EP_CMDIN),
			pum->u.rec_buffer, pum->rec_buffer_len,
			&actual_length, PCAN_USBPRO_COMMAND_TIMEOUT);
		if (err) {
			netdev_err(dev->netdev, "waiting rsp error %d\n", err);
			break;
		}

if (actual_length == 0)
			continue;

err = -EBADMSG;
		if (actual_length < PCAN_USBPRO_MSG_HEADER_LEN) {
			netdev_err(dev->netdev,
				   "got abnormal too small rsp (len=%d)\n",
				   actual_length);
			break;
		}

pc = pcan_msg_init(&rsp, pum->u.rec_buffer,
			actual_length);

rec_cnt = le32_to_cpu(*rsp.u.rec_cnt);

/* loop on records stored into message */
		for (r = 0; r < rec_cnt; r++) {
			pr = (union pcan_usb_pro_rec *)pc;
			rec_len = pcan_usb_pro_sizeof_rec[pr->data_type];
			if (!rec_len) {
				netdev_err(dev->netdev,
					   "got unprocessed record in msg\n");
				pcan_dump_mem("rcvd rsp msg", pum->u.rec_buffer,
					      actual_length);
				break;
			}

/* check if response corresponds to request */
			if (pr->data_type != req_data_type)
				netdev_err(dev->netdev,
					   "got unwanted rsp %xh: ignored\n",
					   pr->data_type);

/* check if channel in response corresponds too */
			else if ((req_channel != 0xff) && \
				(pr->bus_act.channel != req_channel))
				netdev_err(dev->netdev,
					"got rsp %xh but on chan%u: ignored\n",
					req_data_type, pr->bus_act.channel);

/* got the response */
			else
				return 0;

/* otherwise, go on with next record in message */
			pc += rec_len;
		}
	}

return (i >= PCAN_USBPRO_RSP_SUBMIT_MAX) ? -ERANGE : err;
}

static int pcan_usb_pro_send_req(struct peak_usb_device *dev, int req_id,
				 int req_value, void *req_addr, int req_size)
{
	int err;
	u8 req_type;
	unsigned int p;

/* usb device unregistered? */
	if (!(dev->state & PCAN_USB_STATE_CONNECTED))
		return 0;

memset(req_addr, '\0', req_size);

req_type = USB_TYPE_VENDOR | USB_RECIP_OTHER;

switch (req_id) {
	case PCAN_USBPRO_REQ_FCT:
		p = usb_sndctrlpipe(dev->udev, 0);
		break;

default:
		p = usb_rcvctrlpipe(dev->udev, 0);
		req_type |= USB_DIR_IN;
		break;
	}

err = usb_control_msg(dev->udev, p, req_id, req_type, req_value, 0,
			      req_addr, req_size, 2 * USB_CTRL_GET_TIMEOUT);
	if (err < 0) {
		netdev_info(dev->netdev,
			    "unable to request usb[type=%d value=%d] err=%d\n",
			    req_id, req_value, err);
		return err;
	}

return 0;
}

static int pcan_usb_pro_set_ts(struct peak_usb_device *dev, u16 onoff)
{
	struct pcan_usb_pro_msg um;

pcan_msg_init_empty(&um, dev->cmd_buf, PCAN_USB_MAX_CMD_LEN);
	pcan_msg_add_rec(&um, PCAN_USBPRO_SETTS, onoff);