can: Proper ctrlmode handling for CAN devices

This patch adds error checking of ctrlmode values for CAN devices. As
an example all availabe bits are implemented in the mcp251x driver.

Signed-off-by: Christian Pellegrin <chripell@fsfe.org>
Acked-by: Wolfgang Grandegger <wg@grandegger.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/can/at91_can.c b/drivers/net/can/at91_can.c
index f728749..a2f29a3 100644 (file)
--- a/drivers/net/can/at91_can.c
+++ b/drivers/net/can/at91_can.c
@@ -1073,6 +1073,7 @@ static int __init at91_can_probe(struct platform_device *pdev)
        priv->can.bittiming_const = &at91_bittiming_const;
        priv->can.do_set_bittiming = at91_set_bittiming;
        priv->can.do_set_mode = at91_set_mode;
+       priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES;
        priv->reg_base = addr;
        priv->dev = dev;
        priv->clk = clk;

diff --git a/drivers/net/can/bfin_can.c b/drivers/net/can/bfin_can.c
index 7e1926e..bf7f9ba 100644 (file)
--- a/drivers/net/can/bfin_can.c
+++ b/drivers/net/can/bfin_can.c
@@ -603,6 +603,7 @@ struct net_device *alloc_bfin_candev(void)
        priv->can.bittiming_const = &bfin_can_bittiming_const;
        priv->can.do_set_bittiming = bfin_can_set_bittiming;
        priv->can.do_set_mode = bfin_can_set_mode;
+       priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES;
 
        return dev;
 }

diff --git a/drivers/net/can/dev.c b/drivers/net/can/dev.c
index c1bb29f..f08f120 100644 (file)
--- a/drivers/net/can/dev.c
+++ b/drivers/net/can/dev.c
@@ -592,6 +592,8 @@ static int can_changelink(struct net_device *dev,
                if (dev->flags & IFF_UP)
                        return -EBUSY;
                cm = nla_data(data[IFLA_CAN_CTRLMODE]);
+               if (cm->flags & ~priv->ctrlmode_supported)
+                       return -EOPNOTSUPP;
                priv->ctrlmode &= ~cm->mask;
                priv->ctrlmode |= cm->flags;
        }

diff --git a/drivers/net/can/mcp251x.c b/drivers/net/can/mcp251x.c
index afa2fa4..bbe186b 100644 (file)
--- a/drivers/net/can/mcp251x.c
+++ b/drivers/net/can/mcp251x.c
@@ -539,9 +539,14 @@ static void mcp251x_set_normal_mode(struct spi_device *spi)
        if (priv->can.ctrlmode & CAN_CTRLMODE_LOOPBACK) {
                /* Put device into loopback mode */
                mcp251x_write_reg(spi, CANCTRL, CANCTRL_REQOP_LOOPBACK);
+       } else if (priv->can.ctrlmode & CAN_CTRLMODE_LISTENONLY) {
+               /* Put device into listen-only mode */
+               mcp251x_write_reg(spi, CANCTRL, CANCTRL_REQOP_LISTEN_ONLY);
        } else {
                /* Put device into normal mode */
-               mcp251x_write_reg(spi, CANCTRL, CANCTRL_REQOP_NORMAL);
+               mcp251x_write_reg(spi, CANCTRL, CANCTRL_REQOP_NORMAL |
+                                 (priv->can.ctrlmode & CAN_CTRLMODE_ONE_SHOT ?
+                                  CANCTRL_OSM : 0));
 
                /* Wait for the device to enter normal mode */
                timeout = jiffies + HZ;
@@ -948,6 +953,10 @@ static int __devinit mcp251x_can_probe(struct spi_device *spi)
        priv->can.bittiming_const = &mcp251x_bittiming_const;
        priv->can.do_set_mode = mcp251x_do_set_mode;
        priv->can.clock.freq = pdata->oscillator_frequency / 2;
+       priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES |
+               CAN_CTRLMODE_LOOPBACK | CAN_CTRLMODE_LISTENONLY;
+       if (pdata->model == CAN_MCP251X_MCP2515)
+               priv->can.ctrlmode_supported |= CAN_CTRLMODE_ONE_SHOT;
        priv->net = net;
        dev_set_drvdata(&spi->dev, priv);
 

diff --git a/drivers/net/can/mscan/mscan.c b/drivers/net/can/mscan/mscan.c
index 40827c1..6b7dd57 100644 (file)
--- a/drivers/net/can/mscan/mscan.c
+++ b/drivers/net/can/mscan/mscan.c
@@ -686,6 +686,7 @@ struct net_device *alloc_mscandev(void)
        priv->can.bittiming_const = &mscan_bittiming_const;
        priv->can.do_set_bittiming = mscan_do_set_bittiming;
        priv->can.do_set_mode = mscan_do_set_mode;
+       priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES;
 
        for (i = 0; i < TX_QUEUE_SIZE; i++) {
                priv->tx_queue[i].id = i;

diff --git a/drivers/net/can/sja1000/sja1000.c b/drivers/net/can/sja1000/sja1000.c
index 345304d..ace103a 100644 (file)
--- a/drivers/net/can/sja1000/sja1000.c
+++ b/drivers/net/can/sja1000/sja1000.c
@@ -567,6 +567,7 @@ struct net_device *alloc_sja1000dev(int sizeof_priv)
        priv->can.bittiming_const = &sja1000_bittiming_const;
        priv->can.do_set_bittiming = sja1000_set_bittiming;
        priv->can.do_set_mode = sja1000_set_mode;
+       priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES;
 
        if (sizeof_priv)
                priv->priv = (void *)priv + sizeof(struct sja1000_priv);

diff --git a/drivers/net/can/ti_hecc.c b/drivers/net/can/ti_hecc.c
index 7d370e3..8332e24 100644 (file)
--- a/drivers/net/can/ti_hecc.c
+++ b/drivers/net/can/ti_hecc.c
@@ -909,6 +909,7 @@ static int ti_hecc_probe(struct platform_device *pdev)
        priv->can.bittiming_const = &ti_hecc_bittiming_const;
        priv->can.do_set_mode = ti_hecc_do_set_mode;
        priv->can.do_get_state = ti_hecc_get_state;
+       priv->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES;
 
        ndev->irq = irq->start;
        ndev->flags |= IFF_ECHO;

diff --git a/drivers/net/can/usb/ems_usb.c b/drivers/net/can/usb/ems_usb.c
index ddb17e2..bfab283 100644 (file)
--- a/drivers/net/can/usb/ems_usb.c
+++ b/drivers/net/can/usb/ems_usb.c
@@ -1022,6 +1022,7 @@ static int ems_usb_probe(struct usb_interface *intf,
        dev->can.bittiming_const = &ems_usb_bittiming_const;
        dev->can.do_set_bittiming = ems_usb_set_bittiming;
        dev->can.do_set_mode = ems_usb_set_mode;
+       dev->can.ctrlmode_supported = CAN_CTRLMODE_3_SAMPLES;
 
        netdev->flags |= IFF_ECHO; /* we support local echo */
 

diff --git a/include/linux/can/dev.h b/include/linux/can/dev.h
index 7e7c98a..c8c660a 100644 (file)
--- a/include/linux/can/dev.h
+++ b/include/linux/can/dev.h
@@ -38,6 +38,7 @@ struct can_priv {
 
        enum can_state state;
        u32 ctrlmode;
+       u32 ctrlmode_supported;
 
        int restart_ms;
        struct timer_list restart_timer;