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Commit a26f878a authored by Henrique de Moraes Holschuh's avatar Henrique de Moraes Holschuh Committed by Len Brown
Browse files

ACPI: ibm-acpi: Use a enum to select the thermal sensor reading strategy 



This patch consolidades all decisions regarding the strategy to be used to
read thinkpad thermal sensors into a single enum, and refactors the
thermal sensor reading code to use a much more readable (and easier to
extend) switch() construct, in a separate function.

Signed-off-by: default avatarHenrique de Moraes Holschuh <hmh@hmh.eng.br>
parent 8d297264

drivers/acpi/ibm_acpi.c

+65 −25
Original line number Diff line number Diff line
@@ -217,6 +217,17 @@ IBM_HANDLE(sfan, ec, "SFAN", /* 570 */ 
#define IBM_HKEY_HID	"IBM0068"

#define IBM_PCI_HID	"PNP0A03"



enum thermal_access_mode {

	IBMACPI_THERMAL_NONE = 0,	/* No thermal support */

	IBMACPI_THERMAL_ACPI_TMP07,	/* Use ACPI TMP0-7 */

	IBMACPI_THERMAL_ACPI_UPDT,	/* Use ACPI TMP0-7 with UPDT */

};



#define IBMACPI_MAX_THERMAL_SENSORS 8	/* Max thermal sensors supported */

struct ibm_thermal_sensors_struct {

	s32 temp[IBMACPI_MAX_THERMAL_SENSORS];

};



struct ibm_struct {

	char *name;

	char param[32];
@@ -1275,51 +1286,80 @@ static int acpi_ec_write(int i, u8 v) 
	return 1;

}



static int thermal_tmp_supported;

static int thermal_updt_supported;

static enum thermal_access_mode thermal_read_mode;



static int thermal_init(void)

{

	/* temperatures not supported on 570, G4x, R30, R31, R32 */

	thermal_tmp_supported = acpi_evalf(ec_handle, NULL, "TMP7", "qv");



	if (acpi_evalf(ec_handle, NULL, "TMP7", "qv")) {

		if (acpi_evalf(ec_handle, NULL, "UPDT", "qv")) {

			/* 600e/x, 770e, 770x */

	thermal_updt_supported = acpi_evalf(ec_handle, NULL, "UPDT", "qv");

			thermal_read_mode = IBMACPI_THERMAL_ACPI_UPDT;

		} else {

			/* Standard ACPI TMPx access, max 8 sensors */

			thermal_read_mode = IBMACPI_THERMAL_ACPI_TMP07;

		}

	} else {

		/* temperatures not supported on 570, G4x, R30, R31, R32 */

		thermal_read_mode = IBMACPI_THERMAL_NONE;

	}



	return 0;

}



static int thermal_read(char *p)

static int thermal_get_sensors(struct ibm_thermal_sensors_struct *s)

{

	int len = 0;



	if (!thermal_tmp_supported)

		len += sprintf(p + len, "temperatures:\tnot supported\n");

	else {

	int i, t;

	char tmpi[] = "TMPi";

		s8 tmp[8];



		if (thermal_updt_supported)

	if (!s)

		return -EINVAL;



	switch (thermal_read_mode) {

	case IBMACPI_THERMAL_ACPI_UPDT:

		if (!acpi_evalf(ec_handle, NULL, "UPDT", "v"))

			return -EIO;

		for (i = 0; i < 8; i++) {

			tmpi[3] = '0' + i;

			if (!acpi_evalf(ec_handle, &t, tmpi, "d"))

				return -EIO;

			s->temp[i] = (t - 2732) * 100;

		}

		return 8;



	case IBMACPI_THERMAL_ACPI_TMP07:

		for (i = 0; i < 8; i++) {

			tmpi[3] = '0' + i;

			if (!acpi_evalf(ec_handle, &t, tmpi, "d"))

				return -EIO;

			if (thermal_updt_supported)

				tmp[i] = (t - 2732 + 5) / 10;

			else

				tmp[i] = t;

			s->temp[i] = t * 1000;

		}

		return 8;



		len += sprintf(p + len,

			       "temperatures:\t%d %d %d %d %d %d %d %d\n",

			       tmp[0], tmp[1], tmp[2], tmp[3],

			       tmp[4], tmp[5], tmp[6], tmp[7]);

	case IBMACPI_THERMAL_NONE:

	default:

		return 0;

	}

}



static int thermal_read(char *p)

{

	int len = 0;

	int n, i;

	struct ibm_thermal_sensors_struct t;



	n = thermal_get_sensors(&t);

	if (unlikely(n < 0))

		return n;



	len += sprintf(p + len, "temperatures:\t");



	if (n > 0) {

		for (i = 0; i < (n - 1); i++)

			len += sprintf(p + len, "%d ", t.temp[i] / 1000);

		len += sprintf(p + len, "%d\n", t.temp[i] / 1000);

	} else

		len += sprintf(p + len, "not supported\n");



	return len;

}