Commit 29b71a1c authored by Thomas Renninger's avatar Thomas Renninger Committed by Len Brown
Browse files

ACPI: autoload modules - Create ACPI alias interface 



Modify modpost (file2alias.c) to add acpi*:XYZ0001: alias in modules.alias
like:
grep acpi /lib/modules/2.6.22-rc4-default/modules.alias
alias acpi*:SNY5001:* sony_laptop
alias acpi*:SNY6001:* sony_laptop
for e.g. the sony_laptop module.
This module matches against all ACPI devices with a HID or CID of SNY5001
or SNY6001

Export an uevent and modalias sysfs file containing the string:
[MODALIAS=]acpi:PNP0C0C:
additional CIDs are concatenated at the end.

Signed-off-by: default avatarThomas Renninger <trenn@suse.de>
Signed-off-by: default avatarKay Sievers <kay.sievers@vrfy.org>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent 8c8eb78f

drivers/acpi/scan.c

+111 −45
Original line number Diff line number Diff line
@@ -16,7 +16,7 @@ ACPI_MODULE_NAME("scan"); 
extern struct acpi_device *acpi_root;



#define ACPI_BUS_CLASS			"system_bus"

#define ACPI_BUS_HID			"ACPI_BUS"

#define ACPI_BUS_HID			"LNXSYBUS"

#define ACPI_BUS_DEVICE_NAME		"System Bus"



static LIST_HEAD(acpi_device_list);
@@ -29,6 +29,62 @@ struct acpi_device_bus_id{ 
	unsigned int instance_no;

	struct list_head node;

};



/*

 * Creates hid/cid(s) string needed for modalias and uevent

 * e.g. on a device with hid:IBM0001 and cid:ACPI0001 you get:

 * char *modalias: "acpi:IBM0001:ACPI0001"

*/

int create_modalias(struct acpi_device *acpi_dev, char *modalias, int size){



	int len;



	if (!acpi_dev->flags.hardware_id)

		return -ENODEV;



	len = snprintf(modalias, size, "acpi:%s:",

		       acpi_dev->pnp.hardware_id);

	if (len < 0 || len >= size)

		return -EINVAL;

	size -= len;



	if (acpi_dev->flags.compatible_ids) {

		struct acpi_compatible_id_list *cid_list;

		int i;

		int count;



		cid_list = acpi_dev->pnp.cid_list;

		for (i = 0; i < cid_list->count; i++) {

			count = snprintf(&modalias[len], size, "%s:",

					 cid_list->id[i].value);

			if (count < 0 || count >= size) {

				printk(KERN_ERR "acpi: %s cid[%i] exceeds event buffer size",

				       acpi_dev->pnp.device_name, i);

				break;

			}

			len += count;

			size -= count;

		}

	}



	modalias[len] = '\0';

	return len;

}



static ssize_t

acpi_device_modalias_show(struct device *dev, struct device_attribute *attr, char *buf) {

	struct acpi_device *acpi_dev = to_acpi_device(dev);

	int len;



	/* Device has no HID and no CID or string is >1024 */

	len = create_modalias(acpi_dev, buf, 1024);

	if (len <= 0)

		return 0;

	buf[len++] = '\n';

	return len;

}

static DEVICE_ATTR(modalias, 0444, acpi_device_modalias_show, NULL);



static int acpi_eject_operation(acpi_handle handle, int lockable)

{

	struct acpi_object_list arg_list;
@@ -154,6 +210,12 @@ static int acpi_device_setup_files(struct acpi_device *dev) 
			goto end;

	}



	if (dev->flags.hardware_id || dev->flags.compatible_ids){

		result = device_create_file(&dev->dev, &dev_attr_modalias);

		if(result)

			goto end;

	}



        /*

         * If device has _EJ0, 'eject' file is created that is used to trigger

         * hot-removal function from userland.
@@ -178,6 +240,9 @@ static void acpi_device_remove_files(struct acpi_device *dev) 
	if (ACPI_SUCCESS(status))

		device_remove_file(&dev->dev, &dev_attr_eject);



	if (dev->flags.hardware_id || dev->flags.compatible_ids)

		device_remove_file(&dev->dev, &dev_attr_modalias);



	if(dev->flags.hardware_id)

		device_remove_file(&dev->dev, &dev_attr_hid);

	if(dev->handle)
@@ -186,6 +251,37 @@ static void acpi_device_remove_files(struct acpi_device *dev) 
/* --------------------------------------------------------------------------

			ACPI Bus operations

   -------------------------------------------------------------------------- */



int acpi_match_device_ids(struct acpi_device *device,

			  const struct acpi_device_id *ids)

{

	const struct acpi_device_id *id;



	if (device->flags.hardware_id) {

		for (id = ids; id->id[0]; id++) {

			if (!strcmp((char*)id->id, device->pnp.hardware_id))

				return 0;

		}

	}



	if (device->flags.compatible_ids) {

		struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;

		int i;



		for (id = ids; id->id[0]; id++) {

			/* compare multiple _CID entries against driver ids */

			for (i = 0; i < cid_list->count; i++) {

				if (!strcmp((char*)id->id,

					    cid_list->id[i].value))

					return 0;

			}

		}

	}



	return -ENOENT;

}

EXPORT_SYMBOL(acpi_match_device_ids);



static void acpi_device_release(struct device *dev)

{

	struct acpi_device *acpi_dev = to_acpi_device(dev);
@@ -219,37 +315,19 @@ static int acpi_bus_match(struct device *dev, struct device_driver *drv) 
	struct acpi_device *acpi_dev = to_acpi_device(dev);

	struct acpi_driver *acpi_drv = to_acpi_driver(drv);



	return !acpi_match_ids(acpi_dev, acpi_drv->ids);

	return !acpi_match_device_ids(acpi_dev, acpi_drv->ids);

}



static int acpi_device_uevent(struct device *dev, char **envp, int num_envp,

			      char *buffer, int buffer_size)

{

	struct acpi_device *acpi_dev = to_acpi_device(dev);

	int i = 0, length = 0, ret = 0;



	if (acpi_dev->flags.hardware_id)

		ret = add_uevent_var(envp, num_envp, &i,

			buffer, buffer_size, &length,

			"HWID=%s", acpi_dev->pnp.hardware_id);

	if (ret)

		return -ENOMEM;

	if (acpi_dev->flags.compatible_ids) {

		int j;

		struct acpi_compatible_id_list *cid_list;



		cid_list = acpi_dev->pnp.cid_list;



		for (j = 0; j < cid_list->count; j++) {

			ret = add_uevent_var(envp, num_envp, &i, buffer,

				buffer_size, &length, "COMPTID=%s",

				cid_list->id[j].value);

			if (ret)

				return -ENOMEM;

		}

	strcpy(buffer, "MODALIAS=");

	if (create_modalias(acpi_dev, buffer + 9, buffer_size - 9) > 0) {

		envp[0] = buffer;

		envp[1] = NULL;

	}



	envp[i] = NULL;

	return 0;

}
@@ -543,25 +621,6 @@ void acpi_bus_data_handler(acpi_handle handle, u32 function, void *context) 
	return;

}



int acpi_match_ids(struct acpi_device *device, char *ids)

{

	if (device->flags.hardware_id)

		if (strstr(ids, device->pnp.hardware_id))

			return 0;



	if (device->flags.compatible_ids) {

		struct acpi_compatible_id_list *cid_list = device->pnp.cid_list;

		int i;



		/* compare multiple _CID entries against driver ids */

		for (i = 0; i < cid_list->count; i++) {

			if (strstr(ids, cid_list->id[i].value))

				return 0;

		}

	}

	return -ENOENT;

}



static int acpi_bus_get_perf_flags(struct acpi_device *device)

{

	device->performance.state = ACPI_STATE_UNKNOWN;
@@ -624,6 +683,13 @@ static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device) 
	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };

	union acpi_object *package = NULL;



	struct acpi_device_id button_device_ids[] = {

		{"PNP0C0D", 0},

		{"PNP0C0C", 0},

		{"PNP0C0E", 0},

		{"", 0},

	};





	/* _PRW */

	status = acpi_evaluate_object(device->handle, "_PRW", NULL, &buffer);
@@ -643,7 +709,7 @@ static int acpi_bus_get_wakeup_device_flags(struct acpi_device *device) 


	device->wakeup.flags.valid = 1;

	/* Power button, Lid switch always enable wakeup */

	if (!acpi_match_ids(device, "PNP0C0D,PNP0C0C,PNP0C0E"))

	if (!acpi_match_device_ids(device, button_device_ids))

		device->wakeup.flags.run_wake = 1;



      end:

drivers/pnp/pnpacpi/core.c

+12 −7
Original line number Diff line number Diff line
@@ -21,7 +21,10 @@ 


#include <linux/acpi.h>

#include <linux/pnp.h>

#include <linux/mod_devicetable.h>

#include <acpi/acpi_bus.h>

#include <acpi/actypes.h>



#include "pnpacpi.h"



static int num = 0;
@@ -33,15 +36,17 @@ static int num = 0; 
 * have irqs (PIC, Timer) because we call acpi_register_gsi.

 * Finaly only devices that have a CRS method need to be in this list.

 */

static char __initdata excluded_id_list[] =

	"PNP0C09," /* EC */

	"PNP0C0F," /* Link device */

	"PNP0000," /* PIC */

	"PNP0100," /* Timer */

	;

static __initdata struct acpi_device_id excluded_id_list[] ={

	{"PNP0C09", 0}, /* EC */

	{"PNP0C0F", 0}, /* Link device */

	{"PNP0000", 0}, /* PIC */

	{"PNP0100", 0}, /* Timer */

	{"", 0},

};



static inline int is_exclusive_device(struct acpi_device *dev)

{

	return (!acpi_match_ids(dev, excluded_id_list));

	return (!acpi_match_device_ids(dev, excluded_id_list));

}



/*

include/linux/acpi.h

+1 −0
Original line number Diff line number Diff line
@@ -33,6 +33,7 @@ 
#endif



#include <linux/list.h>

#include <linux/mod_devicetable.h>



#include <acpi/acpi.h>

#include <acpi/acpi_bus.h>

include/linux/mod_devicetable.h

+6 −0
Original line number Diff line number Diff line
@@ -159,6 +159,12 @@ struct ap_device_id { 


#define AP_DEVICE_ID_MATCH_DEVICE_TYPE		0x01



#define ACPI_ID_LEN	9



struct acpi_device_id {

	__u8 id[ACPI_ID_LEN];

	kernel_ulong_t driver_data;

};



#define PNP_ID_LEN	8

#define PNP_MAX_DEVICES	8

scripts/mod/file2alias.c

+12 −0
Original line number Diff line number Diff line
@@ -290,6 +290,14 @@ static int do_serio_entry(const char *filename, 
	return 1;

}



/* looks like: "acpi:ACPI0003 or acpi:PNP0C0B" or "acpi:LNXVIDEO" */

static int do_acpi_entry(const char *filename,

			struct acpi_device_id *id, char *alias)

{

	sprintf(alias, "acpi*:%s:", id->id);

	return 1;

}



/* looks like: "pnp:dD" */

static int do_pnp_entry(const char *filename,

			struct pnp_device_id *id, char *alias)
@@ -551,6 +559,10 @@ void handle_moddevtable(struct module *mod, struct elf_info *info, 
		do_table(symval, sym->st_size,

			 sizeof(struct serio_device_id), "serio",

			 do_serio_entry, mod);

	else if (sym_is(symname, "__mod_acpi_device_table"))

		do_table(symval, sym->st_size,

			 sizeof(struct acpi_device_id), "acpi",

			 do_acpi_entry, mod);

	else if (sym_is(symname, "__mod_pnp_device_table"))

		do_table(symval, sym->st_size,

			 sizeof(struct pnp_device_id), "pnp",

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