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Commit 18ad7996 authored by Henrique de Moraes Holschuh's avatar Henrique de Moraes Holschuh Committed by Len Brown
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ACPI: ibm-acpi: cleanup fan_write 



This patch cleans up fan_write so that it is much easier to read and
extend.  It separates the proc api handling from the operations themselves.

Signed-off-by: default avatarHenrique de Moraes Holschuh <hmh@hmh.eng.br>
parent c52f0aa5

drivers/acpi/ibm_acpi.c

+125 −22
Original line number Diff line number Diff line
@@ -1843,38 +1843,141 @@ static int fan_read(char *p) 
	return len;

}



static int fan_write(char *buf)

static int fan_set_level(int level)

{

	char *cmd;

	int level, speed;



	while ((cmd = next_cmd(&buf))) {

		if (sfan_handle &&

		    sscanf(cmd, "level %d", &level) == 1 &&

		    level >= 0 && level <= 7) {

			/* 570, 770x-JL */

	switch (fan_control_access_mode) {

	case IBMACPI_FAN_WR_ACPI_SFAN:

		if (level >= 0 && level <= 7) {

			if (!acpi_evalf(sfan_handle, NULL, NULL, "vd", level))

				return -EIO;

		} else if (!gfan_handle && strlencmp(cmd, "enable") == 0) {

			/* all except 570, 600e/x, 770e, 770x */

		} else

			return -EINVAL;

		break;



	default:

		return -ENXIO;

	}

	return 0;

}



static int fan_set_enable(void)

{

	switch (fan_control_access_mode) {

	case IBMACPI_FAN_WR_ACPI_FANS:

	case IBMACPI_FAN_WR_TPEC:

		if (!acpi_ec_write(fan_status_offset, 0x80))

			return -EIO;

		} else if (!gfan_handle && strlencmp(cmd, "disable") == 0) {

			/* all except 570, 600e/x, 770e, 770x */

		break;



	default:

		return -ENXIO;

	}

	return 0;

}



static int fan_set_disable(void)

{

	switch (fan_control_access_mode) {

	case IBMACPI_FAN_WR_ACPI_FANS:

	case IBMACPI_FAN_WR_TPEC:

		if (!acpi_ec_write(fan_status_offset, 0x00))

			return -EIO;

		} else if (fans_handle &&

			   sscanf(cmd, "speed %d", &speed) == 1 &&

			   speed >= 0 && speed <= 65535) {

			/* X31, X40 */

		break;



	default:

		return -ENXIO;

	}

	return 0;

}



static int fan_set_speed(int speed)

{

	switch (fan_control_access_mode) {

	case IBMACPI_FAN_WR_ACPI_FANS:

		if (speed >= 0 && speed <= 65535) {

			if (!acpi_evalf(fans_handle, NULL, NULL, "vddd",

					speed, speed, speed))

				return -EIO;

		} else

			return -EINVAL;

		break;



	default:

		return -ENXIO;

	}

	return 0;

}



static int fan_write_cmd_level(const char *cmd, int *rc)

{

	int level;



	if (sscanf(cmd, "level %d", &level) != 1)

		return 0;



	if ((*rc = fan_set_level(level)) == -ENXIO)

		printk(IBM_ERR "level command accepted for unsupported "

		       "access mode %d", fan_control_access_mode);



	return 1;

}



static int fan_write_cmd_enable(const char *cmd, int *rc)

{

	if (strlencmp(cmd, "enable") != 0)

		return 0;



	if ((*rc = fan_set_enable()) == -ENXIO)

		printk(IBM_ERR "enable command accepted for unsupported "

		       "access mode %d", fan_control_access_mode);



	return 1;

}



static int fan_write_cmd_disable(const char *cmd, int *rc)

{

	if (strlencmp(cmd, "disable") != 0)

		return 0;



	if ((*rc = fan_set_disable()) == -ENXIO)

		printk(IBM_ERR "disable command accepted for unsupported "

		       "access mode %d", fan_control_access_mode);



	return 1;

}



static int fan_write_cmd_speed(const char *cmd, int *rc)

{

	int speed;



	if (sscanf(cmd, "speed %d", &speed) != 1)

		return 0;



	if ((*rc = fan_set_speed(speed)) == -ENXIO)

		printk(IBM_ERR "speed command accepted for unsupported "

		       "access mode %d", fan_control_access_mode);



	return 1;

}



static int fan_write(char *buf)

{

	char *cmd;

	int rc = 0;



	while (!rc && (cmd = next_cmd(&buf))) {

		if (!((fan_control_commands & IBMACPI_FAN_CMD_LEVEL) &&

		      fan_write_cmd_level(cmd, &rc)) &&

		    !((fan_control_commands & IBMACPI_FAN_CMD_ENABLE) &&

		      (fan_write_cmd_enable(cmd, &rc) ||

		       fan_write_cmd_disable(cmd, &rc))) &&

		    !((fan_control_commands & IBMACPI_FAN_CMD_SPEED) &&

		      fan_write_cmd_speed(cmd, &rc))

		    )

			rc = -EINVAL;

	}



	return rc;

}



static struct ibm_struct ibms[] = {