Commit 84a6273f authored by Azael Avalos's avatar Azael Avalos Committed by Matthew Garrett
Browse files

toshiba_acpi: Add System Configuration Interface 

SCI stands for System Configuration Interface,
which aim is to conceal differences in hardware
between different models.

This patch introduces four new calls: sci_open,
sci_close, sci_read and sci_write, along with
its definitions and return codes which will be
used by later patches.

More information about the SCI can be found at
Jonathan Buzzard's website [1].

[1] http://www.buzzard.me.uk/toshiba/docs.html



Signed-off-by: default avatarAzael Avalos <coproscefalo@gmail.com>
Signed-off-by: default avatarMatthew Garrett <matthew.garrett@nebula.com>
parent 119f4498

drivers/platform/x86/toshiba_acpi.c

+79 −0
Original line number Diff line number Diff line
@@ -77,6 +77,9 @@ MODULE_LICENSE("GPL"); 
 * However the ACPI methods seem to be incomplete in some areas (for

 * example they allow setting, but not reading, the LCD brightness value),

 * so this is still useful.

 * 

 * SCI stands for "System Configuration Interface" which aim is to

 * conceal differences in hardware between different models.

 */



#define HCI_WORDS			6
@@ -84,12 +87,20 @@ MODULE_LICENSE("GPL"); 
/* operations */

#define HCI_SET				0xff00

#define HCI_GET				0xfe00

#define SCI_OPEN			0xf100

#define SCI_CLOSE			0xf200

#define SCI_GET				0xf300

#define SCI_SET				0xf400



/* return codes */

#define HCI_SUCCESS			0x0000

#define HCI_FAILURE			0x1000

#define HCI_NOT_SUPPORTED		0x8000

#define HCI_EMPTY			0x8c00

#define SCI_OPEN_CLOSE_OK		0x0044

#define SCI_ALREADY_OPEN		0x8100

#define SCI_NOT_OPENED			0x8200

#define SCI_NOT_PRESENT			0x8600



/* registers */

#define HCI_FAN				0x0004
@@ -280,6 +291,74 @@ static acpi_status hci_read2(struct toshiba_acpi_dev *dev, u32 reg, 
	return status;

}



/* common sci tasks

 */



static int sci_open(struct toshiba_acpi_dev *dev)

{

	u32 in[HCI_WORDS] = { SCI_OPEN, 0, 0, 0, 0, 0 };

	u32 out[HCI_WORDS];

	acpi_status status;



	status = hci_raw(dev, in, out);

	if  (ACPI_FAILURE(status) || out[0] == HCI_FAILURE) {

		pr_err("ACPI call to open SCI failed\n");

		return 0;

	}



	if (out[0] == SCI_OPEN_CLOSE_OK) {

		return 1;

	} else if (out[0] == SCI_ALREADY_OPEN) {

		pr_info("Toshiba SCI already opened\n");

		return 1;

	} else if (out[0] == SCI_NOT_PRESENT) {

		pr_info("Toshiba SCI is not present\n");

	}



	return 0;

}



static void sci_close(struct toshiba_acpi_dev *dev)

{

	u32 in[HCI_WORDS] = { SCI_CLOSE, 0, 0, 0, 0, 0 };

	u32 out[HCI_WORDS];

	acpi_status status;



	status = hci_raw(dev, in, out);

	if (ACPI_FAILURE(status) || out[0] == HCI_FAILURE) {

		pr_err("ACPI call to close SCI failed\n");

		return;

	}



	if (out[0] == SCI_OPEN_CLOSE_OK)

		return;

	else if (out[0] == SCI_NOT_OPENED)

		pr_info("Toshiba SCI not opened\n");

	else if (out[0] == SCI_NOT_PRESENT)

		pr_info("Toshiba SCI is not present\n");

}



static acpi_status sci_read(struct toshiba_acpi_dev *dev, u32 reg,

			    u32 *out1, u32 *result)

{

	u32 in[HCI_WORDS] = { SCI_GET, reg, 0, 0, 0, 0 };

	u32 out[HCI_WORDS];

	acpi_status status = hci_raw(dev, in, out);

	*out1 = out[2];

	*result = (ACPI_SUCCESS(status)) ? out[0] : HCI_FAILURE;

	return status;

}



static acpi_status sci_write(struct toshiba_acpi_dev *dev, u32 reg,

			     u32 in1, u32 *result)

{

	u32 in[HCI_WORDS] = { SCI_SET, reg, in1, 0, 0, 0 };

	u32 out[HCI_WORDS];

	acpi_status status = hci_raw(dev, in, out);

	*result = (ACPI_SUCCESS(status)) ? out[0] : HCI_FAILURE;

	return status;

}



/* Illumination support */

static int toshiba_illumination_available(struct toshiba_acpi_dev *dev)

{

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