mirror of https://gitee.com/openkylin/linux.git
1154 lines
26 KiB
C
1154 lines
26 KiB
C
/*****************************************************************************
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*
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* Filename: stir4200.c
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* Version: 0.4
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* Description: Irda SigmaTel USB Dongle
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* Status: Experimental
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* Author: Stephen Hemminger <shemminger@osdl.org>
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*
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* Based on earlier driver by Paul Stewart <stewart@parc.com>
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*
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* Copyright (C) 2000, Roman Weissgaerber <weissg@vienna.at>
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* Copyright (C) 2001, Dag Brattli <dag@brattli.net>
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* Copyright (C) 2001, Jean Tourrilhes <jt@hpl.hp.com>
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* Copyright (C) 2004, Stephen Hemminger <shemminger@osdl.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*****************************************************************************/
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/*
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* This dongle does no framing, and requires polling to receive the
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* data. The STIr4200 has bulk in and out endpoints just like
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* usr-irda devices, but the data it sends and receives is raw; like
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* irtty, it needs to call the wrap and unwrap functions to add and
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* remove SOF/BOF and escape characters to/from the frame.
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*/
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/init.h>
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#include <linux/time.h>
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#include <linux/skbuff.h>
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#include <linux/netdevice.h>
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#include <linux/slab.h>
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#include <linux/delay.h>
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#include <linux/usb.h>
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#include <linux/crc32.h>
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#include <linux/kthread.h>
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#include <linux/freezer.h>
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#include <net/irda/irda.h>
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#include <net/irda/irda_device.h>
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#include <net/irda/wrapper.h>
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#include <net/irda/crc.h>
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#include <asm/byteorder.h>
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#include <asm/unaligned.h>
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MODULE_AUTHOR("Stephen Hemminger <shemminger@linux-foundation.org>");
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MODULE_DESCRIPTION("IrDA-USB Dongle Driver for SigmaTel STIr4200");
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MODULE_LICENSE("GPL");
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static int qos_mtt_bits = 0x07; /* 1 ms or more */
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module_param(qos_mtt_bits, int, 0);
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MODULE_PARM_DESC(qos_mtt_bits, "Minimum Turn Time");
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static int rx_sensitivity = 1; /* FIR 0..4, SIR 0..6 */
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module_param(rx_sensitivity, int, 0);
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MODULE_PARM_DESC(rx_sensitivity, "Set Receiver sensitivity (0-6, 0 is most sensitive)");
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static int tx_power = 0; /* 0 = highest ... 3 = lowest */
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module_param(tx_power, int, 0);
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MODULE_PARM_DESC(tx_power, "Set Transmitter power (0-3, 0 is highest power)");
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#define STIR_IRDA_HEADER 4
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#define CTRL_TIMEOUT 100 /* milliseconds */
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#define TRANSMIT_TIMEOUT 200 /* milliseconds */
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#define STIR_FIFO_SIZE 4096
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#define FIFO_REGS_SIZE 3
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enum FirChars {
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FIR_CE = 0x7d,
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FIR_XBOF = 0x7f,
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FIR_EOF = 0x7e,
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};
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enum StirRequests {
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REQ_WRITE_REG = 0x00,
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REQ_READ_REG = 0x01,
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REQ_READ_ROM = 0x02,
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REQ_WRITE_SINGLE = 0x03,
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};
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/* Register offsets */
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enum StirRegs {
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REG_RSVD=0,
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REG_MODE,
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REG_PDCLK,
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REG_CTRL1,
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REG_CTRL2,
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REG_FIFOCTL,
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REG_FIFOLSB,
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REG_FIFOMSB,
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REG_DPLL,
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REG_IRDIG,
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REG_TEST=15,
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};
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enum StirModeMask {
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MODE_FIR = 0x80,
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MODE_SIR = 0x20,
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MODE_ASK = 0x10,
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MODE_FASTRX = 0x08,
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MODE_FFRSTEN = 0x04,
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MODE_NRESET = 0x02,
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MODE_2400 = 0x01,
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};
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enum StirPdclkMask {
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PDCLK_4000000 = 0x02,
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PDCLK_115200 = 0x09,
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PDCLK_57600 = 0x13,
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PDCLK_38400 = 0x1D,
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PDCLK_19200 = 0x3B,
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PDCLK_9600 = 0x77,
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PDCLK_2400 = 0xDF,
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};
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enum StirCtrl1Mask {
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CTRL1_SDMODE = 0x80,
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CTRL1_RXSLOW = 0x40,
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CTRL1_TXPWD = 0x10,
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CTRL1_RXPWD = 0x08,
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CTRL1_SRESET = 0x01,
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};
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enum StirCtrl2Mask {
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CTRL2_SPWIDTH = 0x08,
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CTRL2_REVID = 0x03,
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};
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enum StirFifoCtlMask {
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FIFOCTL_DIR = 0x10,
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FIFOCTL_CLR = 0x08,
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FIFOCTL_EMPTY = 0x04,
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};
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enum StirDiagMask {
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IRDIG_RXHIGH = 0x80,
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IRDIG_RXLOW = 0x40,
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};
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enum StirTestMask {
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TEST_PLLDOWN = 0x80,
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TEST_LOOPIR = 0x40,
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TEST_LOOPUSB = 0x20,
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TEST_TSTENA = 0x10,
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TEST_TSTOSC = 0x0F,
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};
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struct stir_cb {
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struct usb_device *usbdev; /* init: probe_irda */
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struct net_device *netdev; /* network layer */
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struct irlap_cb *irlap; /* The link layer we are binded to */
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struct qos_info qos;
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unsigned speed; /* Current speed */
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struct task_struct *thread; /* transmit thread */
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struct sk_buff *tx_pending;
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void *io_buf; /* transmit/receive buffer */
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__u8 *fifo_status;
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iobuff_t rx_buff; /* receive unwrap state machine */
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struct timeval rx_time;
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int receiving;
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struct urb *rx_urb;
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};
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/* These are the currently known USB ids */
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static struct usb_device_id dongles[] = {
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/* SigmaTel, Inc, STIr4200 IrDA/USB Bridge */
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{ USB_DEVICE(0x066f, 0x4200) },
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{ }
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};
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MODULE_DEVICE_TABLE(usb, dongles);
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/* Send control message to set dongle register */
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static int write_reg(struct stir_cb *stir, __u16 reg, __u8 value)
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{
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struct usb_device *dev = stir->usbdev;
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pr_debug("%s: write reg %d = 0x%x\n",
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stir->netdev->name, reg, value);
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return usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
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REQ_WRITE_SINGLE,
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USB_DIR_OUT|USB_TYPE_VENDOR|USB_RECIP_DEVICE,
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value, reg, NULL, 0,
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CTRL_TIMEOUT);
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}
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/* Send control message to read multiple registers */
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static inline int read_reg(struct stir_cb *stir, __u16 reg,
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__u8 *data, __u16 count)
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{
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struct usb_device *dev = stir->usbdev;
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return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
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REQ_READ_REG,
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USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
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0, reg, data, count,
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CTRL_TIMEOUT);
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}
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static inline int isfir(u32 speed)
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{
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return (speed == 4000000);
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}
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/*
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* Prepare a FIR IrDA frame for transmission to the USB dongle. The
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* FIR transmit frame is documented in the datasheet. It consists of
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* a two byte 0x55 0xAA sequence, two little-endian length bytes, a
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* sequence of exactly 16 XBOF bytes of 0x7E, two BOF bytes of 0x7E,
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* then the data escaped as follows:
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*
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* 0x7D -> 0x7D 0x5D
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* 0x7E -> 0x7D 0x5E
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* 0x7F -> 0x7D 0x5F
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*
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* Then, 4 bytes of little endian (stuffed) FCS follow, then two
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* trailing EOF bytes of 0x7E.
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*/
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static inline __u8 *stuff_fir(__u8 *p, __u8 c)
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{
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switch(c) {
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case 0x7d:
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case 0x7e:
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case 0x7f:
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*p++ = 0x7d;
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c ^= IRDA_TRANS;
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/* fall through */
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default:
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*p++ = c;
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}
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return p;
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}
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/* Take raw data in skb and put it wrapped into buf */
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static unsigned wrap_fir_skb(const struct sk_buff *skb, __u8 *buf)
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{
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__u8 *ptr = buf;
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__u32 fcs = ~(crc32_le(~0, skb->data, skb->len));
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__u16 wraplen;
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int i;
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/* Header */
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buf[0] = 0x55;
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buf[1] = 0xAA;
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ptr = buf + STIR_IRDA_HEADER;
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memset(ptr, 0x7f, 16);
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ptr += 16;
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/* BOF */
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*ptr++ = 0x7e;
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*ptr++ = 0x7e;
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/* Address / Control / Information */
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for (i = 0; i < skb->len; i++)
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ptr = stuff_fir(ptr, skb->data[i]);
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/* FCS */
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ptr = stuff_fir(ptr, fcs & 0xff);
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ptr = stuff_fir(ptr, (fcs >> 8) & 0xff);
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ptr = stuff_fir(ptr, (fcs >> 16) & 0xff);
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ptr = stuff_fir(ptr, (fcs >> 24) & 0xff);
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/* EOFs */
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*ptr++ = 0x7e;
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*ptr++ = 0x7e;
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/* Total length, minus the header */
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wraplen = (ptr - buf) - STIR_IRDA_HEADER;
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buf[2] = wraplen & 0xff;
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buf[3] = (wraplen >> 8) & 0xff;
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return wraplen + STIR_IRDA_HEADER;
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}
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static unsigned wrap_sir_skb(struct sk_buff *skb, __u8 *buf)
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{
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__u16 wraplen;
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wraplen = async_wrap_skb(skb, buf + STIR_IRDA_HEADER,
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STIR_FIFO_SIZE - STIR_IRDA_HEADER);
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buf[0] = 0x55;
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buf[1] = 0xAA;
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buf[2] = wraplen & 0xff;
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buf[3] = (wraplen >> 8) & 0xff;
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return wraplen + STIR_IRDA_HEADER;
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}
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/*
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* Frame is fully formed in the rx_buff so check crc
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* and pass up to irlap
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* setup for next receive
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*/
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static void fir_eof(struct stir_cb *stir)
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{
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iobuff_t *rx_buff = &stir->rx_buff;
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int len = rx_buff->len - 4;
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struct sk_buff *skb, *nskb;
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__u32 fcs;
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if (unlikely(len <= 0)) {
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pr_debug("%s: short frame len %d\n",
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stir->netdev->name, len);
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++stir->netdev->stats.rx_errors;
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++stir->netdev->stats.rx_length_errors;
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return;
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}
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fcs = ~(crc32_le(~0, rx_buff->data, len));
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if (fcs != get_unaligned_le32(rx_buff->data + len)) {
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pr_debug("crc error calc 0x%x len %d\n", fcs, len);
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stir->netdev->stats.rx_errors++;
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stir->netdev->stats.rx_crc_errors++;
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return;
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}
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/* if frame is short then just copy it */
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if (len < IRDA_RX_COPY_THRESHOLD) {
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nskb = dev_alloc_skb(len + 1);
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if (unlikely(!nskb)) {
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++stir->netdev->stats.rx_dropped;
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return;
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}
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skb_reserve(nskb, 1);
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skb = nskb;
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skb_copy_to_linear_data(nskb, rx_buff->data, len);
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} else {
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nskb = dev_alloc_skb(rx_buff->truesize);
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if (unlikely(!nskb)) {
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++stir->netdev->stats.rx_dropped;
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return;
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}
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skb_reserve(nskb, 1);
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skb = rx_buff->skb;
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rx_buff->skb = nskb;
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rx_buff->head = nskb->data;
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}
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skb_put(skb, len);
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skb_reset_mac_header(skb);
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skb->protocol = htons(ETH_P_IRDA);
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skb->dev = stir->netdev;
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netif_rx(skb);
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stir->netdev->stats.rx_packets++;
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stir->netdev->stats.rx_bytes += len;
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rx_buff->data = rx_buff->head;
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rx_buff->len = 0;
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}
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/* Unwrap FIR stuffed data and bump it to IrLAP */
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static void stir_fir_chars(struct stir_cb *stir,
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const __u8 *bytes, int len)
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{
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iobuff_t *rx_buff = &stir->rx_buff;
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int i;
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for (i = 0; i < len; i++) {
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__u8 byte = bytes[i];
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switch(rx_buff->state) {
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case OUTSIDE_FRAME:
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/* ignore garbage till start of frame */
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if (unlikely(byte != FIR_EOF))
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continue;
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/* Now receiving frame */
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rx_buff->state = BEGIN_FRAME;
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/* Time to initialize receive buffer */
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rx_buff->data = rx_buff->head;
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rx_buff->len = 0;
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continue;
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case LINK_ESCAPE:
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if (byte == FIR_EOF) {
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pr_debug("%s: got EOF after escape\n",
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stir->netdev->name);
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goto frame_error;
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}
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rx_buff->state = INSIDE_FRAME;
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byte ^= IRDA_TRANS;
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break;
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case BEGIN_FRAME:
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/* ignore multiple BOF/EOF */
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if (byte == FIR_EOF)
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continue;
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rx_buff->state = INSIDE_FRAME;
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rx_buff->in_frame = TRUE;
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|
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/* fall through */
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case INSIDE_FRAME:
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switch(byte) {
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case FIR_CE:
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rx_buff->state = LINK_ESCAPE;
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continue;
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case FIR_XBOF:
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/* 0x7f is not used in this framing */
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pr_debug("%s: got XBOF without escape\n",
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stir->netdev->name);
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goto frame_error;
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case FIR_EOF:
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rx_buff->state = OUTSIDE_FRAME;
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rx_buff->in_frame = FALSE;
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fir_eof(stir);
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continue;
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}
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break;
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}
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/* add byte to rx buffer */
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if (unlikely(rx_buff->len >= rx_buff->truesize)) {
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pr_debug("%s: fir frame exceeds %d\n",
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stir->netdev->name, rx_buff->truesize);
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++stir->netdev->stats.rx_over_errors;
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goto error_recovery;
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}
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|
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rx_buff->data[rx_buff->len++] = byte;
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continue;
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|
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frame_error:
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++stir->netdev->stats.rx_frame_errors;
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|
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error_recovery:
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++stir->netdev->stats.rx_errors;
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rx_buff->state = OUTSIDE_FRAME;
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rx_buff->in_frame = FALSE;
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}
|
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}
|
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|
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/* Unwrap SIR stuffed data and bump it up to IrLAP */
|
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static void stir_sir_chars(struct stir_cb *stir,
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const __u8 *bytes, int len)
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{
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int i;
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for (i = 0; i < len; i++)
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async_unwrap_char(stir->netdev, &stir->netdev->stats,
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&stir->rx_buff, bytes[i]);
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}
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|
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static inline void unwrap_chars(struct stir_cb *stir,
|
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const __u8 *bytes, int length)
|
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{
|
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if (isfir(stir->speed))
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stir_fir_chars(stir, bytes, length);
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else
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stir_sir_chars(stir, bytes, length);
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}
|
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|
|
/* Mode parameters for each speed */
|
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static const struct {
|
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unsigned speed;
|
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__u8 pdclk;
|
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} stir_modes[] = {
|
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{ 2400, PDCLK_2400 },
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{ 9600, PDCLK_9600 },
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{ 19200, PDCLK_19200 },
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{ 38400, PDCLK_38400 },
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{ 57600, PDCLK_57600 },
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{ 115200, PDCLK_115200 },
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{ 4000000, PDCLK_4000000 },
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};
|
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|
|
|
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/*
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* Setup chip for speed.
|
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* Called at startup to initialize the chip
|
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* and on speed changes.
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*
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* Note: Write multiple registers doesn't appear to work
|
|
*/
|
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static int change_speed(struct stir_cb *stir, unsigned speed)
|
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{
|
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int i, err;
|
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__u8 mode;
|
|
|
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for (i = 0; i < ARRAY_SIZE(stir_modes); ++i) {
|
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if (speed == stir_modes[i].speed)
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goto found;
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}
|
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|
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dev_warn(&stir->netdev->dev, "invalid speed %d\n", speed);
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return -EINVAL;
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|
|
found:
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pr_debug("speed change from %d to %d\n", stir->speed, speed);
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|
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/* Reset modulator */
|
|
err = write_reg(stir, REG_CTRL1, CTRL1_SRESET);
|
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if (err)
|
|
goto out;
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|
|
|
/* Undocumented magic to tweak the DPLL */
|
|
err = write_reg(stir, REG_DPLL, 0x15);
|
|
if (err)
|
|
goto out;
|
|
|
|
/* Set clock */
|
|
err = write_reg(stir, REG_PDCLK, stir_modes[i].pdclk);
|
|
if (err)
|
|
goto out;
|
|
|
|
mode = MODE_NRESET | MODE_FASTRX;
|
|
if (isfir(speed))
|
|
mode |= MODE_FIR | MODE_FFRSTEN;
|
|
else
|
|
mode |= MODE_SIR;
|
|
|
|
if (speed == 2400)
|
|
mode |= MODE_2400;
|
|
|
|
err = write_reg(stir, REG_MODE, mode);
|
|
if (err)
|
|
goto out;
|
|
|
|
/* This resets TEMIC style transceiver if any. */
|
|
err = write_reg(stir, REG_CTRL1,
|
|
CTRL1_SDMODE | (tx_power & 3) << 1);
|
|
if (err)
|
|
goto out;
|
|
|
|
err = write_reg(stir, REG_CTRL1, (tx_power & 3) << 1);
|
|
if (err)
|
|
goto out;
|
|
|
|
/* Reset sensitivity */
|
|
err = write_reg(stir, REG_CTRL2, (rx_sensitivity & 7) << 5);
|
|
out:
|
|
stir->speed = speed;
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Called from net/core when new frame is available.
|
|
*/
|
|
static netdev_tx_t stir_hard_xmit(struct sk_buff *skb,
|
|
struct net_device *netdev)
|
|
{
|
|
struct stir_cb *stir = netdev_priv(netdev);
|
|
|
|
netif_stop_queue(netdev);
|
|
|
|
/* the IRDA wrapping routines don't deal with non linear skb */
|
|
SKB_LINEAR_ASSERT(skb);
|
|
|
|
skb = xchg(&stir->tx_pending, skb);
|
|
wake_up_process(stir->thread);
|
|
|
|
/* this should never happen unless stop/wakeup problem */
|
|
if (unlikely(skb)) {
|
|
WARN_ON(1);
|
|
dev_kfree_skb(skb);
|
|
}
|
|
|
|
return NETDEV_TX_OK;
|
|
}
|
|
|
|
/*
|
|
* Wait for the transmit FIFO to have space for next data
|
|
*
|
|
* If space < 0 then wait till FIFO completely drains.
|
|
* FYI: can take up to 13 seconds at 2400baud.
|
|
*/
|
|
static int fifo_txwait(struct stir_cb *stir, int space)
|
|
{
|
|
int err;
|
|
unsigned long count, status;
|
|
unsigned long prev_count = 0x1fff;
|
|
|
|
/* Read FIFO status and count */
|
|
for (;; prev_count = count) {
|
|
err = read_reg(stir, REG_FIFOCTL, stir->fifo_status,
|
|
FIFO_REGS_SIZE);
|
|
if (unlikely(err != FIFO_REGS_SIZE)) {
|
|
dev_warn(&stir->netdev->dev,
|
|
"FIFO register read error: %d\n", err);
|
|
|
|
return err;
|
|
}
|
|
|
|
status = stir->fifo_status[0];
|
|
count = (unsigned)(stir->fifo_status[2] & 0x1f) << 8
|
|
| stir->fifo_status[1];
|
|
|
|
pr_debug("fifo status 0x%lx count %lu\n", status, count);
|
|
|
|
/* is fifo receiving already, or empty */
|
|
if (!(status & FIFOCTL_DIR) ||
|
|
(status & FIFOCTL_EMPTY))
|
|
return 0;
|
|
|
|
if (signal_pending(current))
|
|
return -EINTR;
|
|
|
|
/* shutting down? */
|
|
if (!netif_running(stir->netdev) ||
|
|
!netif_device_present(stir->netdev))
|
|
return -ESHUTDOWN;
|
|
|
|
/* only waiting for some space */
|
|
if (space >= 0 && STIR_FIFO_SIZE - 4 > space + count)
|
|
return 0;
|
|
|
|
/* queue confused */
|
|
if (prev_count < count)
|
|
break;
|
|
|
|
/* estimate transfer time for remaining chars */
|
|
msleep((count * 8000) / stir->speed);
|
|
}
|
|
|
|
err = write_reg(stir, REG_FIFOCTL, FIFOCTL_CLR);
|
|
if (err)
|
|
return err;
|
|
err = write_reg(stir, REG_FIFOCTL, 0);
|
|
if (err)
|
|
return err;
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
/* Wait for turnaround delay before starting transmit. */
|
|
static void turnaround_delay(const struct stir_cb *stir, long us)
|
|
{
|
|
long ticks;
|
|
struct timeval now;
|
|
|
|
if (us <= 0)
|
|
return;
|
|
|
|
do_gettimeofday(&now);
|
|
if (now.tv_sec - stir->rx_time.tv_sec > 0)
|
|
us -= USEC_PER_SEC;
|
|
us -= now.tv_usec - stir->rx_time.tv_usec;
|
|
if (us < 10)
|
|
return;
|
|
|
|
ticks = us / (1000000 / HZ);
|
|
if (ticks > 0)
|
|
schedule_timeout_interruptible(1 + ticks);
|
|
else
|
|
udelay(us);
|
|
}
|
|
|
|
/*
|
|
* Start receiver by submitting a request to the receive pipe.
|
|
* If nothing is available it will return after rx_interval.
|
|
*/
|
|
static int receive_start(struct stir_cb *stir)
|
|
{
|
|
/* reset state */
|
|
stir->receiving = 1;
|
|
|
|
stir->rx_buff.in_frame = FALSE;
|
|
stir->rx_buff.state = OUTSIDE_FRAME;
|
|
|
|
stir->rx_urb->status = 0;
|
|
return usb_submit_urb(stir->rx_urb, GFP_KERNEL);
|
|
}
|
|
|
|
/* Stop all pending receive Urb's */
|
|
static void receive_stop(struct stir_cb *stir)
|
|
{
|
|
stir->receiving = 0;
|
|
usb_kill_urb(stir->rx_urb);
|
|
|
|
if (stir->rx_buff.in_frame)
|
|
stir->netdev->stats.collisions++;
|
|
}
|
|
/*
|
|
* Wrap data in socket buffer and send it.
|
|
*/
|
|
static void stir_send(struct stir_cb *stir, struct sk_buff *skb)
|
|
{
|
|
unsigned wraplen;
|
|
int first_frame = 0;
|
|
|
|
/* if receiving, need to turnaround */
|
|
if (stir->receiving) {
|
|
receive_stop(stir);
|
|
turnaround_delay(stir, irda_get_mtt(skb));
|
|
first_frame = 1;
|
|
}
|
|
|
|
if (isfir(stir->speed))
|
|
wraplen = wrap_fir_skb(skb, stir->io_buf);
|
|
else
|
|
wraplen = wrap_sir_skb(skb, stir->io_buf);
|
|
|
|
/* check for space available in fifo */
|
|
if (!first_frame)
|
|
fifo_txwait(stir, wraplen);
|
|
|
|
stir->netdev->stats.tx_packets++;
|
|
stir->netdev->stats.tx_bytes += skb->len;
|
|
stir->netdev->trans_start = jiffies;
|
|
pr_debug("send %d (%d)\n", skb->len, wraplen);
|
|
|
|
if (usb_bulk_msg(stir->usbdev, usb_sndbulkpipe(stir->usbdev, 1),
|
|
stir->io_buf, wraplen,
|
|
NULL, TRANSMIT_TIMEOUT))
|
|
stir->netdev->stats.tx_errors++;
|
|
}
|
|
|
|
/*
|
|
* Transmit state machine thread
|
|
*/
|
|
static int stir_transmit_thread(void *arg)
|
|
{
|
|
struct stir_cb *stir = arg;
|
|
struct net_device *dev = stir->netdev;
|
|
struct sk_buff *skb;
|
|
|
|
while (!kthread_should_stop()) {
|
|
#ifdef CONFIG_PM
|
|
/* if suspending, then power off and wait */
|
|
if (unlikely(freezing(current))) {
|
|
if (stir->receiving)
|
|
receive_stop(stir);
|
|
else
|
|
fifo_txwait(stir, -1);
|
|
|
|
write_reg(stir, REG_CTRL1, CTRL1_TXPWD|CTRL1_RXPWD);
|
|
|
|
refrigerator();
|
|
|
|
if (change_speed(stir, stir->speed))
|
|
break;
|
|
}
|
|
#endif
|
|
|
|
/* if something to send? */
|
|
skb = xchg(&stir->tx_pending, NULL);
|
|
if (skb) {
|
|
unsigned new_speed = irda_get_next_speed(skb);
|
|
netif_wake_queue(dev);
|
|
|
|
if (skb->len > 0)
|
|
stir_send(stir, skb);
|
|
dev_kfree_skb(skb);
|
|
|
|
if ((new_speed != -1) && (stir->speed != new_speed)) {
|
|
if (fifo_txwait(stir, -1) ||
|
|
change_speed(stir, new_speed))
|
|
break;
|
|
}
|
|
continue;
|
|
}
|
|
|
|
/* nothing to send? start receiving */
|
|
if (!stir->receiving &&
|
|
irda_device_txqueue_empty(dev)) {
|
|
/* Wait otherwise chip gets confused. */
|
|
if (fifo_txwait(stir, -1))
|
|
break;
|
|
|
|
if (unlikely(receive_start(stir))) {
|
|
if (net_ratelimit())
|
|
dev_info(&dev->dev,
|
|
"%s: receive usb submit failed\n",
|
|
stir->netdev->name);
|
|
stir->receiving = 0;
|
|
msleep(10);
|
|
continue;
|
|
}
|
|
}
|
|
|
|
/* sleep if nothing to send */
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
schedule();
|
|
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* USB bulk receive completion callback.
|
|
* Wakes up every ms (usb round trip) with wrapped
|
|
* data.
|
|
*/
|
|
static void stir_rcv_irq(struct urb *urb)
|
|
{
|
|
struct stir_cb *stir = urb->context;
|
|
int err;
|
|
|
|
/* in process of stopping, just drop data */
|
|
if (!netif_running(stir->netdev))
|
|
return;
|
|
|
|
/* unlink, shutdown, unplug, other nasties */
|
|
if (urb->status != 0)
|
|
return;
|
|
|
|
if (urb->actual_length > 0) {
|
|
pr_debug("receive %d\n", urb->actual_length);
|
|
unwrap_chars(stir, urb->transfer_buffer,
|
|
urb->actual_length);
|
|
|
|
do_gettimeofday(&stir->rx_time);
|
|
}
|
|
|
|
/* kernel thread is stopping receiver don't resubmit */
|
|
if (!stir->receiving)
|
|
return;
|
|
|
|
/* resubmit existing urb */
|
|
err = usb_submit_urb(urb, GFP_ATOMIC);
|
|
|
|
/* in case of error, the kernel thread will restart us */
|
|
if (err) {
|
|
dev_warn(&stir->netdev->dev, "usb receive submit error: %d\n",
|
|
err);
|
|
stir->receiving = 0;
|
|
wake_up_process(stir->thread);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Function stir_net_open (dev)
|
|
*
|
|
* Network device is taken up. Usually this is done by "ifconfig irda0 up"
|
|
*/
|
|
static int stir_net_open(struct net_device *netdev)
|
|
{
|
|
struct stir_cb *stir = netdev_priv(netdev);
|
|
int err;
|
|
char hwname[16];
|
|
|
|
err = usb_clear_halt(stir->usbdev, usb_sndbulkpipe(stir->usbdev, 1));
|
|
if (err)
|
|
goto err_out1;
|
|
err = usb_clear_halt(stir->usbdev, usb_rcvbulkpipe(stir->usbdev, 2));
|
|
if (err)
|
|
goto err_out1;
|
|
|
|
err = change_speed(stir, 9600);
|
|
if (err)
|
|
goto err_out1;
|
|
|
|
err = -ENOMEM;
|
|
|
|
/* Initialize for SIR/FIR to copy data directly into skb. */
|
|
stir->receiving = 0;
|
|
stir->rx_buff.truesize = IRDA_SKB_MAX_MTU;
|
|
stir->rx_buff.skb = dev_alloc_skb(IRDA_SKB_MAX_MTU);
|
|
if (!stir->rx_buff.skb)
|
|
goto err_out1;
|
|
|
|
skb_reserve(stir->rx_buff.skb, 1);
|
|
stir->rx_buff.head = stir->rx_buff.skb->data;
|
|
do_gettimeofday(&stir->rx_time);
|
|
|
|
stir->rx_urb = usb_alloc_urb(0, GFP_KERNEL);
|
|
if (!stir->rx_urb)
|
|
goto err_out2;
|
|
|
|
stir->io_buf = kmalloc(STIR_FIFO_SIZE, GFP_KERNEL);
|
|
if (!stir->io_buf)
|
|
goto err_out3;
|
|
|
|
usb_fill_bulk_urb(stir->rx_urb, stir->usbdev,
|
|
usb_rcvbulkpipe(stir->usbdev, 2),
|
|
stir->io_buf, STIR_FIFO_SIZE,
|
|
stir_rcv_irq, stir);
|
|
|
|
stir->fifo_status = kmalloc(FIFO_REGS_SIZE, GFP_KERNEL);
|
|
if (!stir->fifo_status)
|
|
goto err_out4;
|
|
|
|
/*
|
|
* Now that everything should be initialized properly,
|
|
* Open new IrLAP layer instance to take care of us...
|
|
* Note : will send immediately a speed change...
|
|
*/
|
|
sprintf(hwname, "usb#%d", stir->usbdev->devnum);
|
|
stir->irlap = irlap_open(netdev, &stir->qos, hwname);
|
|
if (!stir->irlap) {
|
|
err("stir4200: irlap_open failed");
|
|
goto err_out5;
|
|
}
|
|
|
|
/** Start kernel thread for transmit. */
|
|
stir->thread = kthread_run(stir_transmit_thread, stir,
|
|
"%s", stir->netdev->name);
|
|
if (IS_ERR(stir->thread)) {
|
|
err = PTR_ERR(stir->thread);
|
|
err("stir4200: unable to start kernel thread");
|
|
goto err_out6;
|
|
}
|
|
|
|
netif_start_queue(netdev);
|
|
|
|
return 0;
|
|
|
|
err_out6:
|
|
irlap_close(stir->irlap);
|
|
err_out5:
|
|
kfree(stir->fifo_status);
|
|
err_out4:
|
|
kfree(stir->io_buf);
|
|
err_out3:
|
|
usb_free_urb(stir->rx_urb);
|
|
err_out2:
|
|
kfree_skb(stir->rx_buff.skb);
|
|
err_out1:
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Function stir_net_close (stir)
|
|
*
|
|
* Network device is taken down. Usually this is done by
|
|
* "ifconfig irda0 down"
|
|
*/
|
|
static int stir_net_close(struct net_device *netdev)
|
|
{
|
|
struct stir_cb *stir = netdev_priv(netdev);
|
|
|
|
/* Stop transmit processing */
|
|
netif_stop_queue(netdev);
|
|
|
|
/* Kill transmit thread */
|
|
kthread_stop(stir->thread);
|
|
kfree(stir->fifo_status);
|
|
|
|
/* Mop up receive urb's */
|
|
usb_kill_urb(stir->rx_urb);
|
|
|
|
kfree(stir->io_buf);
|
|
usb_free_urb(stir->rx_urb);
|
|
kfree_skb(stir->rx_buff.skb);
|
|
|
|
/* Stop and remove instance of IrLAP */
|
|
if (stir->irlap)
|
|
irlap_close(stir->irlap);
|
|
|
|
stir->irlap = NULL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* IOCTLs : Extra out-of-band network commands...
|
|
*/
|
|
static int stir_net_ioctl(struct net_device *netdev, struct ifreq *rq, int cmd)
|
|
{
|
|
struct if_irda_req *irq = (struct if_irda_req *) rq;
|
|
struct stir_cb *stir = netdev_priv(netdev);
|
|
int ret = 0;
|
|
|
|
switch (cmd) {
|
|
case SIOCSBANDWIDTH: /* Set bandwidth */
|
|
if (!capable(CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
|
|
/* Check if the device is still there */
|
|
if (netif_device_present(stir->netdev))
|
|
ret = change_speed(stir, irq->ifr_baudrate);
|
|
break;
|
|
|
|
case SIOCSMEDIABUSY: /* Set media busy */
|
|
if (!capable(CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
|
|
/* Check if the IrDA stack is still there */
|
|
if (netif_running(stir->netdev))
|
|
irda_device_set_media_busy(stir->netdev, TRUE);
|
|
break;
|
|
|
|
case SIOCGRECEIVING:
|
|
/* Only approximately true */
|
|
irq->ifr_receiving = stir->receiving;
|
|
break;
|
|
|
|
default:
|
|
ret = -EOPNOTSUPP;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const struct net_device_ops stir_netdev_ops = {
|
|
.ndo_open = stir_net_open,
|
|
.ndo_stop = stir_net_close,
|
|
.ndo_start_xmit = stir_hard_xmit,
|
|
.ndo_do_ioctl = stir_net_ioctl,
|
|
};
|
|
|
|
/*
|
|
* This routine is called by the USB subsystem for each new device
|
|
* in the system. We need to check if the device is ours, and in
|
|
* this case start handling it.
|
|
* Note : it might be worth protecting this function by a global
|
|
* spinlock... Or not, because maybe USB already deal with that...
|
|
*/
|
|
static int stir_probe(struct usb_interface *intf,
|
|
const struct usb_device_id *id)
|
|
{
|
|
struct usb_device *dev = interface_to_usbdev(intf);
|
|
struct stir_cb *stir = NULL;
|
|
struct net_device *net;
|
|
int ret = -ENOMEM;
|
|
|
|
/* Allocate network device container. */
|
|
net = alloc_irdadev(sizeof(*stir));
|
|
if(!net)
|
|
goto err_out1;
|
|
|
|
SET_NETDEV_DEV(net, &intf->dev);
|
|
stir = netdev_priv(net);
|
|
stir->netdev = net;
|
|
stir->usbdev = dev;
|
|
|
|
ret = usb_reset_configuration(dev);
|
|
if (ret != 0) {
|
|
err("stir4200: usb reset configuration failed");
|
|
goto err_out2;
|
|
}
|
|
|
|
printk(KERN_INFO "SigmaTel STIr4200 IRDA/USB found at address %d, "
|
|
"Vendor: %x, Product: %x\n",
|
|
dev->devnum, le16_to_cpu(dev->descriptor.idVendor),
|
|
le16_to_cpu(dev->descriptor.idProduct));
|
|
|
|
/* Initialize QoS for this device */
|
|
irda_init_max_qos_capabilies(&stir->qos);
|
|
|
|
/* That's the Rx capability. */
|
|
stir->qos.baud_rate.bits &= IR_2400 | IR_9600 | IR_19200 |
|
|
IR_38400 | IR_57600 | IR_115200 |
|
|
(IR_4000000 << 8);
|
|
stir->qos.min_turn_time.bits &= qos_mtt_bits;
|
|
irda_qos_bits_to_value(&stir->qos);
|
|
|
|
/* Override the network functions we need to use */
|
|
net->netdev_ops = &stir_netdev_ops;
|
|
|
|
ret = register_netdev(net);
|
|
if (ret != 0)
|
|
goto err_out2;
|
|
|
|
dev_info(&intf->dev, "IrDA: Registered SigmaTel device %s\n",
|
|
net->name);
|
|
|
|
usb_set_intfdata(intf, stir);
|
|
|
|
return 0;
|
|
|
|
err_out2:
|
|
free_netdev(net);
|
|
err_out1:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* The current device is removed, the USB layer tell us to shut it down...
|
|
*/
|
|
static void stir_disconnect(struct usb_interface *intf)
|
|
{
|
|
struct stir_cb *stir = usb_get_intfdata(intf);
|
|
|
|
if (!stir)
|
|
return;
|
|
|
|
unregister_netdev(stir->netdev);
|
|
free_netdev(stir->netdev);
|
|
|
|
usb_set_intfdata(intf, NULL);
|
|
}
|
|
|
|
#ifdef CONFIG_PM
|
|
/* USB suspend, so power off the transmitter/receiver */
|
|
static int stir_suspend(struct usb_interface *intf, pm_message_t message)
|
|
{
|
|
struct stir_cb *stir = usb_get_intfdata(intf);
|
|
|
|
netif_device_detach(stir->netdev);
|
|
return 0;
|
|
}
|
|
|
|
/* Coming out of suspend, so reset hardware */
|
|
static int stir_resume(struct usb_interface *intf)
|
|
{
|
|
struct stir_cb *stir = usb_get_intfdata(intf);
|
|
|
|
netif_device_attach(stir->netdev);
|
|
|
|
/* receiver restarted when send thread wakes up */
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* USB device callbacks
|
|
*/
|
|
static struct usb_driver irda_driver = {
|
|
.name = "stir4200",
|
|
.probe = stir_probe,
|
|
.disconnect = stir_disconnect,
|
|
.id_table = dongles,
|
|
#ifdef CONFIG_PM
|
|
.suspend = stir_suspend,
|
|
.resume = stir_resume,
|
|
#endif
|
|
};
|
|
|
|
/*
|
|
* Module insertion
|
|
*/
|
|
static int __init stir_init(void)
|
|
{
|
|
return usb_register(&irda_driver);
|
|
}
|
|
module_init(stir_init);
|
|
|
|
/*
|
|
* Module removal
|
|
*/
|
|
static void __exit stir_cleanup(void)
|
|
{
|
|
/* Deregister the driver and remove all pending instances */
|
|
usb_deregister(&irda_driver);
|
|
}
|
|
module_exit(stir_cleanup);
|