can: sja1000: add support for PEAK-System PCMCIA card

This patch adds support to the PCAN-PC Card PCMCIA card from
PEAK-System Technik (www.peak-system.com). This card is a CAN interface
for the PC Card slot. It is available as a single or dual-channel version.

Tested-by: Oliver Hartkopp <socketcan@hartkopp.net>
Acked-by: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: Stephane Grosjean <s.grosjean@peak-system.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

3 files changed, 763 insertions, 0 deletions

diff --git a/drivers/net/can/sja1000/Kconfig b/drivers/net/can/sja1000/Kconfig
index fdc39261d464..b60d6c5f29a0 100644
--- a/drivers/net/can/sja1000/Kconfig
+++ b/drivers/net/can/sja1000/Kconfig
@@ -43,6 +43,15 @@ config CAN_EMS_PCI
           CPC-PCIe and CPC-104P cards from EMS Dr. Thomas Wuensche
           (http://www.ems-wuensche.de).
 
+config CAN_PEAK_PCMCIA
+        tristate "PEAK PCAN-PC Card"
+        depends on PCMCIA
+        ---help---
+          This driver is for the PCAN-PC Card PCMCIA adapter (1 or 2 channels)
+          from PEAK-System (http://www.peak-system.com). To compile this
+          driver as a module, choose M here: the module will be called
+          peak_pcmcia.
+
 config CAN_PEAK_PCI
         tristate "PEAK PCAN-PCI/PCIe/miniPCI Cards"
         depends on PCI
diff --git a/drivers/net/can/sja1000/Makefile b/drivers/net/can/sja1000/Makefile
index 0604f240c8b1..b3d05cbfec36 100644
--- a/drivers/net/can/sja1000/Makefile
+++ b/drivers/net/can/sja1000/Makefile
@@ -9,6 +9,7 @@ obj-$(CONFIG_CAN_SJA1000_OF_PLATFORM) += sja1000_of_platform.o
 obj-$(CONFIG_CAN_EMS_PCMCIA) += ems_pcmcia.o
 obj-$(CONFIG_CAN_EMS_PCI) += ems_pci.o
 obj-$(CONFIG_CAN_KVASER_PCI) += kvaser_pci.o
+obj-$(CONFIG_CAN_PEAK_PCMCIA) += peak_pcmcia.o
 obj-$(CONFIG_CAN_PEAK_PCI) += peak_pci.o
 obj-$(CONFIG_CAN_PLX_PCI) += plx_pci.o
 obj-$(CONFIG_CAN_TSCAN1) += tscan1.o
diff --git a/drivers/net/can/sja1000/peak_pcmcia.c b/drivers/net/can/sja1000/peak_pcmcia.c
new file mode 100644
index 000000000000..ec6bd9d1b2af
--- /dev/null
+++ b/drivers/net/can/sja1000/peak_pcmcia.c
@@ -0,0 +1,753 @@
+/*
+ * Copyright (C) 2010-2012 Stephane Grosjean <s.grosjean@peak-system.com>
+ *
+ * CAN driver for PEAK-System PCAN-PC Card
+ * Derived from the PCAN project file driver/src/pcan_pccard.c
+ * Copyright (C) 2006-2010 PEAK System-Technik GmbH
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the version 2 of the GNU General Public License
+ * as published by the Free Software Foundation
+ *
+ * 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/kernel.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/netdevice.h>
+#include <linux/delay.h>
+#include <linux/timer.h>
+#include <linux/io.h>
+#include <pcmcia/cistpl.h>
+#include <pcmcia/ds.h>
+#include <linux/can.h>
+#include <linux/can/dev.h>
+#include "sja1000.h"
+
+MODULE_AUTHOR("Stephane Grosjean <s.grosjean@peak-system.com>");
+MODULE_DESCRIPTION("CAN driver for PEAK-System PCAN-PC Cards");
+MODULE_LICENSE("GPL v2");
+MODULE_SUPPORTED_DEVICE("PEAK PCAN-PC Card");
+
+/* PEAK-System PCMCIA driver name */
+#define PCC_NAME                "peak_pcmcia"
+
+#define PCC_CHAN_MAX            2
+
+#define PCC_CAN_CLOCK           (16000000 / 2)
+
+#define PCC_MANF_ID             0x0377
+#define PCC_CARD_ID             0x0001
+
+#define PCC_CHAN_SIZE           0x20
+#define PCC_CHAN_OFF(c)         ((c) * PCC_CHAN_SIZE)
+#define PCC_COMN_OFF            (PCC_CHAN_OFF(PCC_CHAN_MAX))
+#define PCC_COMN_SIZE           0x40
+
+/* common area registers */
+#define PCC_CCR                 0x00
+#define PCC_CSR                 0x02
+#define PCC_CPR                 0x04
+#define PCC_SPI_DIR             0x06
+#define PCC_SPI_DOR             0x08
+#define PCC_SPI_ADR             0x0a
+#define PCC_SPI_IR              0x0c
+#define PCC_FW_MAJOR            0x10
+#define PCC_FW_MINOR            0x12
+
+/* CCR bits */
+#define PCC_CCR_CLK_16          0x00
+#define PCC_CCR_CLK_10          0x01
+#define PCC_CCR_CLK_21          0x02
+#define PCC_CCR_CLK_8           0x03
+#define PCC_CCR_CLK_MASK        PCC_CCR_CLK_8
+
+#define PCC_CCR_RST_CHAN(c)     (0x01 << ((c) + 2))
+#define PCC_CCR_RST_ALL         (PCC_CCR_RST_CHAN(0) | PCC_CCR_RST_CHAN(1))
+#define PCC_CCR_RST_MASK        PCC_CCR_RST_ALL
+
+/* led selection bits */
+#define PCC_LED(c)              (1 << (c))
+#define PCC_LED_ALL             (PCC_LED(0) | PCC_LED(1))
+
+/* led state value */
+#define PCC_LED_ON              0x00
+#define PCC_LED_FAST            0x01
+#define PCC_LED_SLOW            0x02
+#define PCC_LED_OFF             0x03
+
+#define PCC_CCR_LED_CHAN(s, c)  ((s) << (((c) + 2) << 1))
+
+#define PCC_CCR_LED_ON_CHAN(c)          PCC_CCR_LED_CHAN(PCC_LED_ON, c)
+#define PCC_CCR_LED_FAST_CHAN(c)        PCC_CCR_LED_CHAN(PCC_LED_FAST, c)
+#define PCC_CCR_LED_SLOW_CHAN(c)        PCC_CCR_LED_CHAN(PCC_LED_SLOW, c)
+#define PCC_CCR_LED_OFF_CHAN(c)         PCC_CCR_LED_CHAN(PCC_LED_OFF, c)
+#define PCC_CCR_LED_MASK_CHAN(c)        PCC_CCR_LED_OFF_CHAN(c)
+#define PCC_CCR_LED_OFF_ALL             (PCC_CCR_LED_OFF_CHAN(0) | \
+                                         PCC_CCR_LED_OFF_CHAN(1))
+#define PCC_CCR_LED_MASK                PCC_CCR_LED_OFF_ALL
+
+#define PCC_CCR_INIT    (PCC_CCR_CLK_16 | PCC_CCR_RST_ALL | PCC_CCR_LED_OFF_ALL)
+
+/* CSR bits */
+#define PCC_CSR_SPI_BUSY                0x04
+
+/* time waiting for SPI busy (prevent from infinite loop) */
+#define PCC_SPI_MAX_BUSY_WAIT_MS        3
+
+/* max count of reading the SPI status register waiting for a change */
+/* (prevent from infinite loop) */
+#define PCC_WRITE_MAX_LOOP              1000
+
+/* max nb of int handled by that isr in one shot (prevent from infinite loop) */
+#define PCC_ISR_MAX_LOOP                10
+
+/* EEPROM chip instruction set */
+/* note: EEPROM Read/Write instructions include A8 bit */
+#define PCC_EEP_WRITE(a)        (0x02 | (((a) & 0x100) >> 5))
+#define PCC_EEP_READ(a)         (0x03 | (((a) & 0x100) >> 5))
+#define PCC_EEP_WRDI            0x04    /* EEPROM Write Disable */
+#define PCC_EEP_RDSR            0x05    /* EEPROM Read Status Register */
+#define PCC_EEP_WREN            0x06    /* EEPROM Write Enable */
+
+/* EEPROM Status Register bits */
+#define PCC_EEP_SR_WEN          0x02    /* EEPROM SR Write Enable bit */
+#define PCC_EEP_SR_WIP          0x01    /* EEPROM SR Write In Progress bit */
+
+/*
+ * The board configuration is probably following:
+ * RX1 is connected to ground.
+ * TX1 is not connected.
+ * CLKO is not connected.
+ * Setting the OCR register to 0xDA is a good idea.
+ * This means normal output mode, push-pull and the correct polarity.
+ */
+#define PCC_OCR                 (OCR_TX0_PUSHPULL | OCR_TX1_PUSHPULL)
+
+/*
+ * In the CDR register, you should set CBP to 1.
+ * You will probably also want to set the clock divider value to 7
+ * (meaning direct oscillator output) because the second SJA1000 chip
+ * is driven by the first one CLKOUT output.
+ */
+#define PCC_CDR                 (CDR_CBP | CDR_CLKOUT_MASK)
+
+struct pcan_channel {
+        struct net_device *netdev;
+        unsigned long prev_rx_bytes;
+        unsigned long prev_tx_bytes;
+};
+
+/* PCAN-PC Card private structure */
+struct pcan_pccard {
+        struct pcmcia_device *pdev;
+        int chan_count;
+        struct pcan_channel channel[PCC_CHAN_MAX];
+        u8 ccr;
+        u8 fw_major;
+        u8 fw_minor;
+        void __iomem *ioport_addr;
+        struct timer_list led_timer;
+};
+
+static struct pcmcia_device_id pcan_table[] = {
+        PCMCIA_DEVICE_MANF_CARD(PCC_MANF_ID, PCC_CARD_ID),
+        PCMCIA_DEVICE_NULL,
+};
+
+MODULE_DEVICE_TABLE(pcmcia, pcan_table);
+
+static void pcan_set_leds(struct pcan_pccard *card, u8 mask, u8 state);
+
+/*
+ * start timer which controls leds state
+ */
+static void pcan_start_led_timer(struct pcan_pccard *card)
+{
+        if (!timer_pending(&card->led_timer))
+                mod_timer(&card->led_timer, jiffies + HZ);
+}
+
+/*
+ * stop the timer which controls leds state
+ */
+static void pcan_stop_led_timer(struct pcan_pccard *card)
+{
+        del_timer_sync(&card->led_timer);
+}
+
+/*
+ * read a sja1000 register
+ */
+static u8 pcan_read_canreg(const struct sja1000_priv *priv, int port)
+{
+        return ioread8(priv->reg_base + port);
+}
+
+/*
+ * write a sja1000 register
+ */
+static void pcan_write_canreg(const struct sja1000_priv *priv, int port, u8 v)
+{
+        struct pcan_pccard *card = priv->priv;
+        int c = (priv->reg_base - card->ioport_addr) / PCC_CHAN_SIZE;
+
+        /* sja1000 register changes control the leds state */
+        if (port == REG_MOD)
+                switch (v) {
+                case MOD_RM:
+                        /* Reset Mode: set led on */
+                        pcan_set_leds(card, PCC_LED(c), PCC_LED_ON);
+                        break;
+                case 0x00:
+                        /* Normal Mode: led slow blinking and start led timer */
+                        pcan_set_leds(card, PCC_LED(c), PCC_LED_SLOW);
+                        pcan_start_led_timer(card);
+                        break;
+                default:
+                        break;
+                }
+
+        iowrite8(v, priv->reg_base + port);
+}
+
+/*
+ * read a register from the common area
+ */
+static u8 pcan_read_reg(struct pcan_pccard *card, int port)
+{
+        return ioread8(card->ioport_addr + PCC_COMN_OFF + port);
+}
+
+/*
+ * write a register into the common area
+ */
+static void pcan_write_reg(struct pcan_pccard *card, int port, u8 v)
+{
+        /* cache ccr value */
+        if (port == PCC_CCR) {
+                if (card->ccr == v)
+                        return;
+                card->ccr = v;
+        }
+
+        iowrite8(v, card->ioport_addr + PCC_COMN_OFF + port);
+}
+
+/*
+ * check whether the card is present by checking its fw version numbers
+ * against values read at probing time.
+ */
+static inline int pcan_pccard_present(struct pcan_pccard *card)
+{
+        return ((pcan_read_reg(card, PCC_FW_MAJOR) == card->fw_major) &&
+                (pcan_read_reg(card, PCC_FW_MINOR) == card->fw_minor));
+}
+
+/*
+ * wait for SPI engine while it is busy
+ */
+static int pcan_wait_spi_busy(struct pcan_pccard *card)
+{
+        unsigned long timeout = jiffies +
+                                msecs_to_jiffies(PCC_SPI_MAX_BUSY_WAIT_MS) + 1;
+
+        /* be sure to read status at least once after sleeping */
+        while (pcan_read_reg(card, PCC_CSR) & PCC_CSR_SPI_BUSY) {
+                if (time_after(jiffies, timeout))
+                        return -EBUSY;
+                schedule();
+        }
+
+        return 0;
+}
+
+/*
+ * write data in device eeprom
+ */
+static int pcan_write_eeprom(struct pcan_pccard *card, u16 addr, u8 v)
+{
+        u8 status;
+        int err, i;
+
+        /* write instruction enabling write */
+        pcan_write_reg(card, PCC_SPI_IR, PCC_EEP_WREN);
+        err = pcan_wait_spi_busy(card);
+        if (err)
+                goto we_spi_err;
+
+        /* wait until write enabled */
+        for (i = 0; i < PCC_WRITE_MAX_LOOP; i++) {
+                /* write instruction reading the status register */
+                pcan_write_reg(card, PCC_SPI_IR, PCC_EEP_RDSR);
+                err = pcan_wait_spi_busy(card);
+                if (err)
+                        goto we_spi_err;
+
+                /* get status register value and check write enable bit */
+                status = pcan_read_reg(card, PCC_SPI_DIR);
+                if (status & PCC_EEP_SR_WEN)
+                        break;
+        }
+
+        if (i >= PCC_WRITE_MAX_LOOP) {
+                dev_err(&card->pdev->dev,
+                        "stop waiting to be allowed to write in eeprom\n");
+                return -EIO;
+        }
+
+        /* set address and data */
+        pcan_write_reg(card, PCC_SPI_ADR, addr & 0xff);
+        pcan_write_reg(card, PCC_SPI_DOR, v);
+
+        /*
+         * write instruction with bit[3] set according to address value:
+         * if addr refers to upper half of the memory array: bit[3] = 1
+         */
+        pcan_write_reg(card, PCC_SPI_IR, PCC_EEP_WRITE(addr));
+        err = pcan_wait_spi_busy(card);
+        if (err)
+                goto we_spi_err;
+
+        /* wait while write in progress */
+        for (i = 0; i < PCC_WRITE_MAX_LOOP; i++) {
+                /* write instruction reading the status register */
+                pcan_write_reg(card, PCC_SPI_IR, PCC_EEP_RDSR);
+                err = pcan_wait_spi_busy(card);
+                if (err)
+                        goto we_spi_err;
+
+                /* get status register value and check write in progress bit */
+                status = pcan_read_reg(card, PCC_SPI_DIR);
+                if (!(status & PCC_EEP_SR_WIP))
+                        break;
+        }
+
+        if (i >= PCC_WRITE_MAX_LOOP) {
+                dev_err(&card->pdev->dev,
+                        "stop waiting for write in eeprom to complete\n");
+                return -EIO;
+        }
+
+        /* write instruction disabling write */
+        pcan_write_reg(card, PCC_SPI_IR, PCC_EEP_WRDI);
+        err = pcan_wait_spi_busy(card);
+        if (err)
+                goto we_spi_err;
+
+        return 0;
+
+we_spi_err:
+        dev_err(&card->pdev->dev,
+                "stop waiting (spi engine always busy) err %d\n", err);
+
+        return err;
+}
+
+static void pcan_set_leds(struct pcan_pccard *card, u8 led_mask, u8 state)
+{
+        u8 ccr = card->ccr;
+        int i;
+
+        for (i = 0; i < card->chan_count; i++)
+                if (led_mask & PCC_LED(i)) {
+                        /* clear corresponding led bits in ccr */
+                        ccr &= ~PCC_CCR_LED_MASK_CHAN(i);
+                        /* then set new bits */
+                        ccr |= PCC_CCR_LED_CHAN(state, i);
+                }
+
+        /* real write only if something has changed in ccr */
+        pcan_write_reg(card, PCC_CCR, ccr);
+}
+
+/*
+ * enable/disable CAN connectors power
+ */
+static inline void pcan_set_can_power(struct pcan_pccard *card, int onoff)
+{
+        int err;
+
+        err = pcan_write_eeprom(card, 0, !!onoff);
+        if (err)
+                dev_err(&card->pdev->dev,
+                        "failed setting power %s to can connectors (err %d)\n",
+                        (onoff) ? "on" : "off", err);
+}
+
+/*
+ * set leds state according to channel activity
+ */
+static void pcan_led_timer(unsigned long arg)
+{
+        struct pcan_pccard *card = (struct pcan_pccard *)arg;
+        struct net_device *netdev;
+        int i, up_count = 0;
+        u8 ccr;
+
+        ccr = card->ccr;
+        for (i = 0; i < card->chan_count; i++) {
+                /* default is: not configured */
+                ccr &= ~PCC_CCR_LED_MASK_CHAN(i);
+                ccr |= PCC_CCR_LED_ON_CHAN(i);
+
+                netdev = card->channel[i].netdev;
+                if (!netdev || !(netdev->flags & IFF_UP))
+                        continue;
+
+                up_count++;
+
+                /* no activity (but configured) */
+                ccr &= ~PCC_CCR_LED_MASK_CHAN(i);
+                ccr |= PCC_CCR_LED_SLOW_CHAN(i);
+
+                /* if bytes counters changed, set fast blinking led */
+                if (netdev->stats.rx_bytes != card->channel[i].prev_rx_bytes) {
+                        card->channel[i].prev_rx_bytes = netdev->stats.rx_bytes;
+                        ccr &= ~PCC_CCR_LED_MASK_CHAN(i);
+                        ccr |= PCC_CCR_LED_FAST_CHAN(i);
+                }
+                if (netdev->stats.tx_bytes != card->channel[i].prev_tx_bytes) {
+                        card->channel[i].prev_tx_bytes = netdev->stats.tx_bytes;
+                        ccr &= ~PCC_CCR_LED_MASK_CHAN(i);
+                        ccr |= PCC_CCR_LED_FAST_CHAN(i);
+                }
+        }
+
+        /* write the new leds state */
+        pcan_write_reg(card, PCC_CCR, ccr);
+
+        /* restart timer (except if no more configured channels) */
+        if (up_count)
+                mod_timer(&card->led_timer, jiffies + HZ);
+}
+
+/*
+ * interrupt service routine
+ */
+static irqreturn_t pcan_isr(int irq, void *dev_id)
+{
+        struct pcan_pccard *card = dev_id;
+        int irq_handled;
+
+        /* prevent from infinite loop */
+        for (irq_handled = 0; irq_handled < PCC_ISR_MAX_LOOP; irq_handled++) {
+                /* handle shared interrupt and next loop */
+                int nothing_to_handle = 1;
+                int i;
+
+                /* check interrupt for each channel */
+                for (i = 0; i < card->chan_count; i++) {
+                        struct net_device *netdev;
+
+                        /*
+                         * check whether the card is present before calling
+                         * sja1000_interrupt() to speed up hotplug detection
+                         */
+                        if (!pcan_pccard_present(card)) {
+                                /* card unplugged during isr */
+                                return IRQ_NONE;
+                        }
+
+                        /*
+                         * should check whether all or SJA1000_MAX_IRQ
+                         * interrupts have been handled: loop again to be sure.
+                         */
+                        netdev = card->channel[i].netdev;
+                        if (netdev &&
+                            sja1000_interrupt(irq, netdev) == IRQ_HANDLED)
+                                nothing_to_handle = 0;
+                }
+
+                if (nothing_to_handle)
+                        break;
+        }
+
+        return (irq_handled) ? IRQ_HANDLED : IRQ_NONE;
+}
+
+/*
+ * free all resources used by the channels and switch off leds and can power
+ */
+static void pcan_free_channels(struct pcan_pccard *card)
+{
+        int i;
+        u8 led_mask = 0;
+
+        for (i = 0; i < card->chan_count; i++) {
+                struct net_device *netdev;
+                char name[IFNAMSIZ];
+
+                led_mask |= PCC_LED(i);
+
+                netdev = card->channel[i].netdev;
+                if (!netdev)
+                        continue;
+
+                strncpy(name, netdev->name, IFNAMSIZ);
+
+                unregister_sja1000dev(netdev);
+
+                free_sja1000dev(netdev);
+
+                dev_info(&card->pdev->dev, "%s removed\n", name);
+        }
+
+        /* do it only if device not removed */
+        if (pcan_pccard_present(card)) {
+                pcan_set_leds(card, led_mask, PCC_LED_OFF);
+                pcan_set_can_power(card, 0);
+        }
+}
+
+/*
+ * check if a CAN controller is present at the specified location
+ */
+static inline int pcan_channel_present(struct sja1000_priv *priv)
+{
+        /* make sure SJA1000 is in reset mode */
+        pcan_write_canreg(priv, REG_MOD, 1);
+        pcan_write_canreg(priv, REG_CDR, CDR_PELICAN);
+
+        /* read reset-values */
+        if (pcan_read_canreg(priv, REG_CDR) == CDR_PELICAN)
+                return 1;
+
+        return 0;
+}
+
+static int pcan_add_channels(struct pcan_pccard *card)
+{
+        struct pcmcia_device *pdev = card->pdev;
+        int i, err = 0;
+        u8 ccr = PCC_CCR_INIT;
+
+        /* init common registers (reset channels and leds off) */
+        card->ccr = ~ccr;
+        pcan_write_reg(card, PCC_CCR, ccr);
+
+        /* wait 2ms before unresetting channels */
+        mdelay(2);
+
+        ccr &= ~PCC_CCR_RST_ALL;
+        pcan_write_reg(card, PCC_CCR, ccr);
+
+        /* create one network device per channel detected */
+        for (i = 0; i < ARRAY_SIZE(card->channel); i++) {
+                struct net_device *netdev;
+                struct sja1000_priv *priv;
+
+                netdev = alloc_sja1000dev(0);
+                if (!netdev) {
+                        err = -ENOMEM;
+                        break;
+                }
+
+                /* update linkages */
+                priv = netdev_priv(netdev);
+                priv->priv = card;
+                SET_NETDEV_DEV(netdev, &pdev->dev);
+
+                priv->irq_flags = IRQF_SHARED;
+                netdev->irq = pdev->irq;
+                priv->reg_base = card->ioport_addr + PCC_CHAN_OFF(i);
+
+                /* check if channel is present */
+                if (!pcan_channel_present(priv)) {
+                        dev_err(&pdev->dev, "channel %d not present\n", i);
+                        free_sja1000dev(netdev);
+                        continue;
+                }
+
+                priv->read_reg  = pcan_read_canreg;
+                priv->write_reg = pcan_write_canreg;
+                priv->can.clock.freq = PCC_CAN_CLOCK;
+                priv->ocr = PCC_OCR;
+                priv->cdr = PCC_CDR;
+
+                /* Neither a slave device distributes the clock */
+                if (i > 0)
+                        priv->cdr |= CDR_CLK_OFF;
+
+                priv->flags |= SJA1000_CUSTOM_IRQ_HANDLER;
+
+                /* register SJA1000 device */
+                err = register_sja1000dev(netdev);
+                if (err) {
+                        free_sja1000dev(netdev);
+                        continue;
+                }
+
+                card->channel[i].netdev = netdev;
+                card->chan_count++;
+
+                /* set corresponding led on in the new ccr */
+                ccr &= ~PCC_CCR_LED_OFF_CHAN(i);
+
+                dev_info(&pdev->dev,
+                        "%s on channel %d at 0x%p irq %d\n",
+                        netdev->name, i, priv->reg_base, pdev->irq);
+        }
+
+        /* write new ccr (change leds state) */
+        pcan_write_reg(card, PCC_CCR, ccr);
+
+        return err;
+}
+
+static int pcan_conf_check(struct pcmcia_device *pdev, void *priv_data)
+{
+        pdev->resource[0]->flags &= ~IO_DATA_PATH_WIDTH;
+        pdev->resource[0]->flags |= IO_DATA_PATH_WIDTH_8; /* only */
+        pdev->io_lines = 10;
+
+        /* This reserves IO space but doesn't actually enable it */
+        return pcmcia_request_io(pdev);
+}
+
+/*
+ * free all resources used by the device
+ */
+static void pcan_free(struct pcmcia_device *pdev)
+{
+        struct pcan_pccard *card = pdev->priv;
+
+        if (!card)
+                return;
+
+        free_irq(pdev->irq, card);
+        pcan_stop_led_timer(card);
+
+        pcan_free_channels(card);
+
+        ioport_unmap(card->ioport_addr);
+
+        kfree(card);
+        pdev->priv = NULL;
+}
+
+/*
+ * setup PCMCIA socket and probe for PEAK-System PC-CARD
+ */
+static int __devinit pcan_probe(struct pcmcia_device *pdev)
+{
+        struct pcan_pccard *card;
+        int err;
+
+        pdev->config_flags |= CONF_ENABLE_IRQ | CONF_AUTO_SET_IO;
+
+        err = pcmcia_loop_config(pdev, pcan_conf_check, NULL);
+        if (err) {
+                dev_err(&pdev->dev, "pcmcia_loop_config() error %d\n", err);
+                goto probe_err_1;
+        }
+
+        if (!pdev->irq) {
+                dev_err(&pdev->dev, "no irq assigned\n");
+                err = -ENODEV;
+                goto probe_err_1;
+        }
+
+        err = pcmcia_enable_device(pdev);
+        if (err) {
+                dev_err(&pdev->dev, "pcmcia_enable_device failed err=%d\n",
+                        err);
+                goto probe_err_1;
+        }
+
+        card = kzalloc(sizeof(struct pcan_pccard), GFP_KERNEL);
+        if (!card) {
+                dev_err(&pdev->dev, "couldn't allocate card memory\n");
+                err = -ENOMEM;
+                goto probe_err_2;
+        }
+
+        card->pdev = pdev;
+        pdev->priv = card;
+
+        /* sja1000 api uses iomem */
+        card->ioport_addr = ioport_map(pdev->resource[0]->start,
+                                        resource_size(pdev->resource[0]));
+        if (!card->ioport_addr) {
+                dev_err(&pdev->dev, "couldn't map io port into io memory\n");
+                err = -ENOMEM;
+                goto probe_err_3;
+        }
+        card->fw_major = pcan_read_reg(card, PCC_FW_MAJOR);
+        card->fw_minor = pcan_read_reg(card, PCC_FW_MINOR);
+
+        /* display board name and firware version */
+        dev_info(&pdev->dev, "PEAK-System pcmcia card %s fw %d.%d\n",
+                pdev->prod_id[1] ? pdev->prod_id[1] : "PCAN-PC Card",
+                card->fw_major, card->fw_minor);
+
+        /* detect available channels */
+        pcan_add_channels(card);
+        if (!card->chan_count)
+                goto probe_err_4;
+
+        /* init the timer which controls the leds */
+        init_timer(&card->led_timer);
+        card->led_timer.function = pcan_led_timer;
+        card->led_timer.data = (unsigned long)card;
+
+        /* request the given irq */
+        err = request_irq(pdev->irq, &pcan_isr, IRQF_SHARED, PCC_NAME, card);
+        if (err) {
+                dev_err(&pdev->dev, "couldn't request irq%d\n", pdev->irq);
+                goto probe_err_5;
+        }
+
+        /* power on the connectors */
+        pcan_set_can_power(card, 1);
+
+        return 0;
+
+probe_err_5:
+        /* unregister can devices from network */
+        pcan_free_channels(card);
+
+probe_err_4:
+        ioport_unmap(card->ioport_addr);
+
+probe_err_3:
+        kfree(card);
+        pdev->priv = NULL;
+
+probe_err_2:
+        pcmcia_disable_device(pdev);
+
+probe_err_1:
+        return err;
+}
+
+/*
+ * release claimed resources
+ */
+static void pcan_remove(struct pcmcia_device *pdev)
+{
+        pcan_free(pdev);
+        pcmcia_disable_device(pdev);
+}
+
+static struct pcmcia_driver pcan_driver = {
+        .name = PCC_NAME,
+        .probe = pcan_probe,
+        .remove = pcan_remove,
+        .id_table = pcan_table,
+};
+
+static int __init pcan_init(void)
+{
+        return pcmcia_register_driver(&pcan_driver);
+}
+module_init(pcan_init);
+
+static void __exit pcan_exit(void)
+{
+        pcmcia_unregister_driver(&pcan_driver);
+}
+module_exit(pcan_exit);