smsc-ircc2: add PNP support

Claim devices using PNP, unless the user explicitly specified device
addresses.  This can be disabled with the "smsc-ircc2.nopnp" option.

This removes the need for probing legacy addresses and helps untangle IR
devices from serial8250 devices.

Sometimes the SMC device is at a legacy COM port address but does not use the
legacy COM IRQ.  In this case, claiming the device using PNP rather than 8250
legacy probe means we can automatically use the correct IRQ rather than
forcing the user to use "setserial" to set the IRQ manually.

If the PNP claim doesn't work, make sure you don't have a setserial init
script, e.g., /etc/init.d/setserial, configured to poke in legacy COM port
resources for the IRDA device.  That causes the serial driver to claim
resources needed by this driver.

Based on this patch by Ville Syrjälä:
    http://www.hpl.hp.com/personal/Jean_Tourrilhes/IrDA/ir260_smsc_pnp.diff

Signed-off-by: Bjorn Helgaas <[email protected]>
Cc: Keith Owens <[email protected]>
Cc: Len Brown <[email protected]>
Cc: Adam Belay <[email protected]>
Cc: Matthieu CASTET <[email protected]>
Cc: Jean Tourrilhes <[email protected]>
Cc: Matthew Garrett <[email protected]>
Cc: Ville Syrjala <[email protected]>
Cc: Russell King <[email protected]>
Acked-by: Samuel Ortiz <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 38d7db3262c7e85f7e9d327f4ed2a30eee47ba1c..fa885174fd7588031142b80cbb1f4d41b5bf0d62 100644 (file)
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1578,6 +1578,17 @@ and is between 256 and 4096 characters. It is defined in the file
        smp-alt-once    [IA-32,SMP] On a hotplug CPU system, only
                        attempt to substitute SMP alternatives once at boot.
 
        smp-alt-once    [IA-32,SMP] On a hotplug CPU system, only
                        attempt to substitute SMP alternatives once at boot.
 

+       smsc-ircc2.nopnp        [HW] Don't use PNP to discover SMC devices
+       smsc-ircc2.ircc_cfg=    [HW] Device configuration I/O port
+       smsc-ircc2.ircc_sir=    [HW] SIR base I/O port
+       smsc-ircc2.ircc_fir=    [HW] FIR base I/O port
+       smsc-ircc2.ircc_irq=    [HW] IRQ line
+       smsc-ircc2.ircc_dma=    [HW] DMA channel
+       smsc-ircc2.ircc_transceiver= [HW] Transceiver type:
+                               0: Toshiba Satellite 1800 (GP data pin select)
+                               1: Fast pin select (default)
+                               2: ATC IRMode
+

        snd-ad1816a=    [HW,ALSA]
 
        snd-ad1848=     [HW,ALSA]
        snd-ad1816a=    [HW,ALSA]
 
        snd-ad1848=     [HW,ALSA]

diff --git a/drivers/net/irda/smsc-ircc2.c b/drivers/net/irda/smsc-ircc2.c
index 1d249737f96ff17e5128f4311bc5faed2369e513..9043bf4aa49ec9e5a477eff5347b49790f2160fa 100644 (file)
--- a/drivers/net/irda/smsc-ircc2.c
+++ b/drivers/net/irda/smsc-ircc2.c
@@ -79,6 +79,10 @@ MODULE_AUTHOR("Daniele Peri <[email protected]>");
 MODULE_DESCRIPTION("SMC IrCC SIR/FIR controller driver");
 MODULE_LICENSE("GPL");
 
 MODULE_DESCRIPTION("SMC IrCC SIR/FIR controller driver");
 MODULE_LICENSE("GPL");
 

+static int smsc_nopnp;
+module_param_named(nopnp, smsc_nopnp, bool, 0);
+MODULE_PARM_DESC(nopnp, "Do not use PNP to detect controller settings");
+

 #define DMA_INVAL 255
 static int ircc_dma = DMA_INVAL;
 module_param(ircc_dma, int, 0);
 #define DMA_INVAL 255
 static int ircc_dma = DMA_INVAL;
 module_param(ircc_dma, int, 0);


@@ -362,7 +366,6 @@ static inline void register_bank(int iobase, int bank)
                iobase + IRCC_MASTER);
 }
 
                iobase + IRCC_MASTER);
 }
 

-#ifdef CONFIG_PNP

 /* PNP hotplug support */
 static const struct pnp_device_id smsc_ircc_pnp_table[] = {
        { .id = "SMCf010", .driver_data = 0 },
 /* PNP hotplug support */
 static const struct pnp_device_id smsc_ircc_pnp_table[] = {
        { .id = "SMCf010", .driver_data = 0 },


@@ -370,7 +373,35 @@ static const struct pnp_device_id smsc_ircc_pnp_table[] = {
        { }
 };
 MODULE_DEVICE_TABLE(pnp, smsc_ircc_pnp_table);
        { }
 };
 MODULE_DEVICE_TABLE(pnp, smsc_ircc_pnp_table);

-#endif
+
+static int pnp_driver_registered;
+
+static int __init smsc_ircc_pnp_probe(struct pnp_dev *dev,
+                                     const struct pnp_device_id *dev_id)
+{
+       unsigned int firbase, sirbase;
+       u8 dma, irq;
+
+       if (!(pnp_port_valid(dev, 0) && pnp_port_valid(dev, 1) &&
+             pnp_dma_valid(dev, 0) && pnp_irq_valid(dev, 0)))
+               return -EINVAL;
+
+       sirbase = pnp_port_start(dev, 0);
+       firbase = pnp_port_start(dev, 1);
+       dma = pnp_dma(dev, 0);
+       irq = pnp_irq(dev, 0);
+
+       if (smsc_ircc_open(firbase, sirbase, dma, irq))
+               return -ENODEV;
+
+       return 0;
+}
+
+static struct pnp_driver smsc_ircc_pnp_driver = {
+       .name           = "smsc-ircc2",
+       .id_table       = smsc_ircc_pnp_table,
+       .probe          = smsc_ircc_pnp_probe,
+};

 
 
 /*******************************************************************************
 
 
 /*******************************************************************************


@@ -381,6 +412,35 @@ MODULE_DEVICE_TABLE(pnp, smsc_ircc_pnp_table);
  *
  *******************************************************************************/
 
  *
  *******************************************************************************/
 

+static int __init smsc_ircc_legacy_probe(void)
+{
+       int ret = 0;
+
+       if (ircc_fir > 0 && ircc_sir > 0) {
+               IRDA_MESSAGE(" Overriding FIR address 0x%04x\n", ircc_fir);
+               IRDA_MESSAGE(" Overriding SIR address 0x%04x\n", ircc_sir);
+
+               if (smsc_ircc_open(ircc_fir, ircc_sir, ircc_dma, ircc_irq))
+                       ret = -ENODEV;
+       } else {
+               ret = -ENODEV;
+
+               /* try user provided configuration register base address */
+               if (ircc_cfg > 0) {
+                       IRDA_MESSAGE(" Overriding configuration address "
+                                    "0x%04x\n", ircc_cfg);
+                       if (!smsc_superio_fdc(ircc_cfg))
+                               ret = 0;
+                       if (!smsc_superio_lpc(ircc_cfg))
+                               ret = 0;
+               }
+
+               if (smsc_ircc_look_for_chips() > 0)
+                       ret = 0;
+       }
+       return ret;
+}
+

 /*
  * Function smsc_ircc_init ()
  *
 /*
  * Function smsc_ircc_init ()
  *


@@ -408,31 +468,20 @@ static int __init smsc_ircc_init(void)
 
        dev_count = 0;
 
 
        dev_count = 0;
 

-       if (ircc_fir > 0 && ircc_sir > 0) {
-               IRDA_MESSAGE(" Overriding FIR address 0x%04x\n", ircc_fir);
-               IRDA_MESSAGE(" Overriding SIR address 0x%04x\n", ircc_sir);
-
-               if (smsc_ircc_open(ircc_fir, ircc_sir, ircc_dma, ircc_irq))
-                       ret = -ENODEV;
+       if (smsc_nopnp || !pnp_platform_devices ||
+           ircc_cfg || ircc_fir || ircc_sir ||
+           ircc_dma != DMA_INVAL || ircc_irq != IRQ_INVAL) {
+               ret = smsc_ircc_legacy_probe();

        } else {
        } else {

-               ret = -ENODEV;
-
-               /* try user provided configuration register base address */
-               if (ircc_cfg > 0) {
-                       IRDA_MESSAGE(" Overriding configuration address "
-                                    "0x%04x\n", ircc_cfg);
-                       if (!smsc_superio_fdc(ircc_cfg))
-                               ret = 0;
-                       if (!smsc_superio_lpc(ircc_cfg))
-                               ret = 0;
-               }
-
-               if (smsc_ircc_look_for_chips() > 0)
-                       ret = 0;
+               if (pnp_register_driver(&smsc_ircc_pnp_driver) == 0)
+                       pnp_driver_registered = 1;

        }
 
        }
 

-       if (ret)
+       if (ret) {
+               if (pnp_driver_registered)
+                       pnp_unregister_driver(&smsc_ircc_pnp_driver);

                platform_driver_unregister(&smsc_ircc_driver);
                platform_driver_unregister(&smsc_ircc_driver);

+       }

 
        return ret;
 }
 
        return ret;
 }


@@ -1842,6 +1891,9 @@ static void __exit smsc_ircc_cleanup(void)
                        smsc_ircc_close(dev_self[i]);
        }
 
                        smsc_ircc_close(dev_self[i]);
        }
 

+       if (pnp_driver_registered)
+               pnp_unregister_driver(&smsc_ircc_pnp_driver);
+

        platform_driver_unregister(&smsc_ircc_driver);
 }
 
        platform_driver_unregister(&smsc_ircc_driver);
 }