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Commit 18020a0d authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'i2c-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging 

* 'i2c-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging:
  i2c-scmi: Provide module aliases for automatic loading
  i2c-scmi: Support IBM SMBus CMI devices
  acpi: Support IBM SMBus CMI devices
parents c27b9a2e 0f5ed04c

drivers/acpi/scan.c

+38 −0
Original line number Diff line number Diff line
@@ -8,6 +8,7 @@ 
#include <linux/acpi.h>

#include <linux/signal.h>

#include <linux/kthread.h>

#include <linux/dmi.h>



#include <acpi/acpi_drivers.h>
@@ -1032,6 +1033,41 @@ static void acpi_add_id(struct acpi_device *device, const char *dev_id) 
	list_add_tail(&id->list, &device->pnp.ids);

}



/*

 * Old IBM workstations have a DSDT bug wherein the SMBus object

 * lacks the SMBUS01 HID and the methods do not have the necessary "_"

 * prefix.  Work around this.

 */

static int acpi_ibm_smbus_match(struct acpi_device *device)

{

	acpi_handle h_dummy;

	struct acpi_buffer path = {ACPI_ALLOCATE_BUFFER, NULL};

	int result;



	if (!dmi_name_in_vendors("IBM"))

		return -ENODEV;



	/* Look for SMBS object */

	result = acpi_get_name(device->handle, ACPI_SINGLE_NAME, &path);

	if (result)

		return result;



	if (strcmp("SMBS", path.pointer)) {

		result = -ENODEV;

		goto out;

	}



	/* Does it have the necessary (but misnamed) methods? */

	result = -ENODEV;

	if (ACPI_SUCCESS(acpi_get_handle(device->handle, "SBI", &h_dummy)) &&

	    ACPI_SUCCESS(acpi_get_handle(device->handle, "SBR", &h_dummy)) &&

	    ACPI_SUCCESS(acpi_get_handle(device->handle, "SBW", &h_dummy)))

		result = 0;

out:

	kfree(path.pointer);

	return result;

}



static void acpi_device_set_id(struct acpi_device *device)

{

	acpi_status status;
@@ -1082,6 +1118,8 @@ static void acpi_device_set_id(struct acpi_device *device) 
			acpi_add_id(device, ACPI_BAY_HID);

		else if (ACPI_SUCCESS(acpi_dock_match(device)))

			acpi_add_id(device, ACPI_DOCK_HID);

		else if (!acpi_ibm_smbus_match(device))

			acpi_add_id(device, ACPI_SMBUS_IBM_HID);



		break;

	case ACPI_BUS_TYPE_POWER:

drivers/i2c/busses/i2c-scmi.c

+24 −8
Original line number Diff line number Diff line
@@ -33,6 +33,7 @@ struct acpi_smbus_cmi { 
	u8 cap_info:1;

	u8 cap_read:1;

	u8 cap_write:1;

	struct smbus_methods_t *methods;

};



static const struct smbus_methods_t smbus_methods = {
@@ -41,10 +42,19 @@ static const struct smbus_methods_t smbus_methods = { 
	.mt_sbw  = "_SBW",

};



/* Some IBM BIOSes omit the leading underscore */

static const struct smbus_methods_t ibm_smbus_methods = {

	.mt_info = "SBI_",

	.mt_sbr  = "SBR_",

	.mt_sbw  = "SBW_",

};



static const struct acpi_device_id acpi_smbus_cmi_ids[] = {

	{"SMBUS01", 0},

	{"SMBUS01", (kernel_ulong_t)&smbus_methods},

	{ACPI_SMBUS_IBM_HID, (kernel_ulong_t)&ibm_smbus_methods},

	{"", 0}

};

MODULE_DEVICE_TABLE(acpi, acpi_smbus_cmi_ids);



#define ACPI_SMBUS_STATUS_OK			0x00

#define ACPI_SMBUS_STATUS_FAIL			0x07
@@ -150,11 +160,11 @@ acpi_smbus_cmi_access(struct i2c_adapter *adap, u16 addr, unsigned short flags, 


	if (read_write == I2C_SMBUS_READ) {

		protocol |= ACPI_SMBUS_PRTCL_READ;

		method = smbus_methods.mt_sbr;

		method = smbus_cmi->methods->mt_sbr;

		input.count = 3;

	} else {

		protocol |= ACPI_SMBUS_PRTCL_WRITE;

		method = smbus_methods.mt_sbw;

		method = smbus_cmi->methods->mt_sbw;

		input.count = 5;

	}
@@ -290,13 +300,13 @@ static int acpi_smbus_cmi_add_cap(struct acpi_smbus_cmi *smbus_cmi, 
	union acpi_object *obj;

	acpi_status status;



	if (!strcmp(name, smbus_methods.mt_info)) {

	if (!strcmp(name, smbus_cmi->methods->mt_info)) {

		status = acpi_evaluate_object(smbus_cmi->handle,

					smbus_methods.mt_info,

					smbus_cmi->methods->mt_info,

					NULL, &buffer);

		if (ACPI_FAILURE(status)) {

			ACPI_ERROR((AE_INFO, "Evaluating %s: %i",

				   smbus_methods.mt_info, status));

				   smbus_cmi->methods->mt_info, status));

			return -EIO;

		}
@@ -319,9 +329,9 @@ static int acpi_smbus_cmi_add_cap(struct acpi_smbus_cmi *smbus_cmi, 


		kfree(buffer.pointer);

		smbus_cmi->cap_info = 1;

	} else if (!strcmp(name, smbus_methods.mt_sbr))

	} else if (!strcmp(name, smbus_cmi->methods->mt_sbr))

		smbus_cmi->cap_read = 1;

	else if (!strcmp(name, smbus_methods.mt_sbw))

	else if (!strcmp(name, smbus_cmi->methods->mt_sbw))

		smbus_cmi->cap_write = 1;

	else

		ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Unsupported CMI method: %s\n",
@@ -349,6 +359,7 @@ static acpi_status acpi_smbus_cmi_query_methods(acpi_handle handle, u32 level, 
static int acpi_smbus_cmi_add(struct acpi_device *device)

{

	struct acpi_smbus_cmi *smbus_cmi;

	const struct acpi_device_id *id;



	smbus_cmi = kzalloc(sizeof(struct acpi_smbus_cmi), GFP_KERNEL);

	if (!smbus_cmi)
@@ -362,6 +373,11 @@ static int acpi_smbus_cmi_add(struct acpi_device *device) 
	smbus_cmi->cap_read = 0;

	smbus_cmi->cap_write = 0;



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

		if (!strcmp(id->id, acpi_device_hid(device)))

			smbus_cmi->methods =

				(struct smbus_methods_t *) id->driver_data;



	acpi_walk_namespace(ACPI_TYPE_METHOD, smbus_cmi->handle, 1,

			    acpi_smbus_cmi_query_methods, NULL, smbus_cmi, NULL);

include/acpi/acpi_drivers.h

+2 −0
Original line number Diff line number Diff line
@@ -65,6 +65,8 @@ 
#define ACPI_VIDEO_HID			"LNXVIDEO"

#define ACPI_BAY_HID			"LNXIOBAY"

#define ACPI_DOCK_HID			"LNXDOCK"

/* Quirk for broken IBM BIOSes */

#define ACPI_SMBUS_IBM_HID		"SMBUSIBM"



/*

 * For fixed hardware buttons, we fabricate acpi_devices with HID