Add hotplug support to mcp251x driver

Chip model can now be selected directly by matching the modalias name
(instead of filling the .model field in platform_data), and allows the
module to be auto-loaded. Previous behaviour is of course still supported.

Convert the two in-tree users to this feature (icontrol & zeus).
Tested on an Zeus platform (mcp2515).

Signed-off-by: Marc Zyngier <maz@misterjones.org>
Acked-by: Christian Pellegrin <chripell@fsfe.org>
Cc: Edwin Peer <epeer@tmtservices.co.za>
Acked-by: Wolfgang Grandegger <wg@grandegger.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 14 insertions, 0 deletions

diff --git a/drivers/net/can/mcp251x.c b/drivers/net/can/mcp251x.c
index f8cc168ec76c..f521579f5adb 100644
--- a/drivers/net/can/mcp251x.c
+++ b/drivers/net/can/mcp251x.c
@@ -922,12 +922,16 @@ static int __devinit mcp251x_can_probe(struct spi_device *spi)
         struct net_device *net;
         struct mcp251x_priv *priv;
         struct mcp251x_platform_data *pdata = spi->dev.platform_data;
+        int model = spi_get_device_id(spi)->driver_data;
         int ret = -ENODEV;
 
         if (!pdata)
                 /* Platform data is required for osc freq */
                 goto error_out;
 
+        if (model)
+                pdata->model = model;
+
         /* Allocate can/net device */
         net = alloc_candev(sizeof(struct mcp251x_priv), TX_ECHO_SKB_MAX);
         if (!net) {
@@ -1117,6 +1121,15 @@ static int mcp251x_can_resume(struct spi_device *spi)
 #define mcp251x_can_resume NULL
 #endif
 
+static struct spi_device_id mcp251x_id_table[] = {
+        { "mcp251x",    0 /* Use pdata.model */ },
+        { "mcp2510",    CAN_MCP251X_MCP2510 },
+        { "mcp2515",    CAN_MCP251X_MCP2515 },
+        { },
+};
+
+MODULE_DEVICE_TABLE(spi, mcp251x_id_table);
+
 static struct spi_driver mcp251x_can_driver = {
         .driver = {
                 .name = DEVICE_NAME,
@@ -1124,6 +1137,7 @@ static struct spi_driver mcp251x_can_driver = {
                 .owner = THIS_MODULE,
         },
 
+        .id_table = mcp251x_id_table,
         .probe = mcp251x_can_probe,
         .remove = __devexit_p(mcp251x_can_remove),
         .suspend = mcp251x_can_suspend,