path: root/drivers/hwmon/asus_atk0110.c

/*
 * Copyright (C) 2007-2009 Luca Tettamanti <kronos.it@gmail.com>
 *
 * This file is released under the GPLv2
 * See COPYING in the top level directory of the kernel tree.
 */

#include <linux/kernel.h>
#include <linux/hwmon.h>
#include <linux/list.h>
#include <linux/module.h>

#include <acpi/acpi.h>
#include <acpi/acpixf.h>
#include <acpi/acpi_drivers.h>
#include <acpi/acpi_bus.h>


#define ATK_HID "ATK0110"

/* Minimum time between readings, enforced in order to avoid
 * hogging the CPU.
 */
#define CACHE_TIME		HZ

#define BOARD_ID		"MBIF"
#define METHOD_ENUMERATE	"GGRP"
#define METHOD_READ		"GITM"
#define METHOD_WRITE		"SITM"
#define METHOD_OLD_READ_TMP	"RTMP"
#define METHOD_OLD_READ_VLT	"RVLT"
#define METHOD_OLD_READ_FAN	"RFAN"
#define METHOD_OLD_ENUM_TMP	"TSIF"
#define METHOD_OLD_ENUM_VLT	"VSIF"
#define METHOD_OLD_ENUM_FAN	"FSIF"

#define ATK_MUX_HWMON		0x00000006ULL

#define ATK_CLASS_MASK		0xff000000ULL
#define ATK_CLASS_FREQ_CTL	0x03000000ULL
#define ATK_CLASS_FAN_CTL	0x04000000ULL
#define ATK_CLASS_HWMON		0x06000000ULL

#define ATK_TYPE_MASK		0x00ff0000ULL
#define HWMON_TYPE_VOLT		0x00020000ULL
#define HWMON_TYPE_TEMP		0x00030000ULL
#define HWMON_TYPE_FAN		0x00040000ULL

#define HWMON_SENSOR_ID_MASK	0x0000ffffULL

enum atk_pack_member {
	HWMON_PACK_FLAGS,
	HWMON_PACK_NAME,
	HWMON_PACK_LIMIT1,
	HWMON_PACK_LIMIT2,
	HWMON_PACK_ENABLE
};

/* New package format */
#define _HWMON_NEW_PACK_SIZE	7
#define _HWMON_NEW_PACK_FLAGS	0
#define _HWMON_NEW_PACK_NAME	1
#define _HWMON_NEW_PACK_UNK1	2
#define _HWMON_NEW_PACK_UNK2	3
#define _HWMON_NEW_PACK_LIMIT1	4
#define _HWMON_NEW_PACK_LIMIT2	5
#define _HWMON_NEW_PACK_ENABLE	6

/* Old package format */
#define _HWMON_OLD_PACK_SIZE	5
#define _HWMON_OLD_PACK_FLAGS	0
#define _HWMON_OLD_PACK_NAME	1
#define _HWMON_OLD_PACK_LIMIT1	2
#define _HWMON_OLD_PACK_LIMIT2	3
#define _HWMON_OLD_PACK_ENABLE	4


struct atk_data {
	struct device *hwmon_dev;
	acpi_handle atk_handle;
	struct acpi_device *acpi_dev;

	bool old_interface;

	/* old interface */
	acpi_handle rtmp_handle;
	acpi_handle rvlt_handle;
	acpi_handle rfan_handle;
	/* new inteface */
	acpi_handle enumerate_handle;
	acpi_handle read_handle;

	int voltage_count;
	int temperature_count;
	int fan_count;
	struct list_head sensor_list;
};


typedef ssize_t (*sysfs_show_func)(struct device *dev,
			struct device_attribute *attr, char *buf);

static const struct acpi_device_id atk_ids[] = {
	{ATK_HID, 0},
	{"", 0},
};
MODULE_DEVICE_TABLE(acpi, atk_ids);

#define ATTR_NAME_SIZE 16 /* Worst case is "tempN_input" */

struct atk_sensor_data {
	struct list_head list;
	struct atk_data *data;
	struct device_attribute label_attr;
	struct device_attribute input_attr;
	struct device_attribute limit1_attr;
	struct device_attribute limit2_attr;
	char label_attr_name[ATTR_NAME_SIZE];
	char input_attr_name[ATTR_NAME_SIZE];
	char limit1_attr_name[ATTR_NAME_SIZE];
	char limit2_attr_name[ATTR_NAME_SIZE];
	u64 id;
	u64 type;
	u64 limit1;
	u64 limit2;
	u64 cached_value;
	unsigned long last_updated; /* in jiffies */
	bool is_valid;
	char const *acpi_name;
};

struct atk_acpi_buffer_u64 {
	union acpi_object buf;
	u64 value;
};

static int atk_add(struct acpi_device *device);
static int atk_remove(struct acpi_device *device, int type);
static void atk_print_sensor(struct atk_data *data, union acpi_object *obj);
static int atk_read_value(struct atk_sensor_data *sensor, u64 *value);
static void atk_free_sensors(struct atk_data *data);

static struct acpi_driver atk_driver = {
	.name	= ATK_HID,
	.class	= "hwmon",
	.ids	= atk_ids,
	.ops	= {
		.add	= atk_add,
		.remove	= atk_remove,
	},
};

#define input_to_atk_sensor(attr) \
	container_of(attr, struct atk_sensor_data, input_attr)

#define label_to_atk_sensor(attr) \
	container_of(attr, struct atk_sensor_data, label_attr)

#define limit1_to_atk_sensor(attr) \
	container_of(attr, struct atk_sensor_data, limit1_attr)

#define limit2_to_atk_sensor(attr) \
	container_of(attr, struct atk_sensor_data, limit2_attr)

static ssize_t atk_input_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct atk_sensor_data *s = input_to_atk_sensor(attr);
	u64 value;
	int err;

	err = atk_read_value(s, &value);
	if (err)
		return err;

	if (s->type == HWMON_TYPE_TEMP)
		/* ACPI returns decidegree */
		value *= 100;

	return sprintf(buf, "%llu\n", value);
}

static ssize_t atk_label_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct atk_sensor_data *s = label_to_atk_sensor(attr);

	return sprintf(buf, "%s\n", s->acpi_name);
}

static ssize_t atk_limit1_show(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct atk_sensor_data *s = limit1_to_atk_sensor(attr);
	u64 value = s->limit1;

	if (s->