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Commit d0d4f69b authored by Bjorn Helgaas's avatar Bjorn Helgaas Committed by Linus Torvalds
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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: default avatarBjorn Helgaas <bjorn.helgaas@hp.com>
Cc: Keith Owens <kaos@ocs.com.au>
Cc: Len Brown <lenb@kernel.org>
Cc: Adam Belay <ambx1@neo.rr.com>
Cc: Matthieu CASTET <castet.matthieu@free.fr>
Cc: Jean Tourrilhes <jt@hpl.hp.com>
Cc: Matthew Garrett <mjg59@srcf.ucam.org>
Cc: Ville Syrjala <syrjala@sci.fi>
Cc: Russell King <rmk+serial@arm.linux.org.uk>
Acked-by: default avatarSamuel Ortiz <samuel@sortiz.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 916f11c7

Documentation/kernel-parameters.txt

+11 −0
Original line number Diff line number Diff line
@@ -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.



	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]

drivers/net/irda/smsc-ircc2.c

+75 −23
Original line number Diff line number Diff line
@@ -79,6 +79,10 @@ MODULE_AUTHOR("Daniele Peri <peri@csai.unipa.it>"); 
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);
@@ -362,7 +366,6 @@ static inline void register_bank(int iobase, int bank) 
               iobase + IRCC_MASTER);

}



#ifdef	CONFIG_PNP

/* 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);

#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 ()

 *
@@ -408,31 +468,20 @@ static int __init smsc_ircc_init(void) 


	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 {

		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);

	}



	return ret;

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

	}



	if (pnp_driver_registered)

		pnp_unregister_driver(&smsc_ircc_pnp_driver);



	platform_driver_unregister(&smsc_ircc_driver);

}