/*
 * Copyright 2014 Martin Peres
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 *
 * Authors: Martin Peres
 */
#include <subdev/bios.h>
#include <subdev/bios/bit.h>
#include <subdev/bios/fan.h>

static u32
nvbios_fan_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt, u8 *len)
{
        struct bit_entry bit_P;
        u32 fan = 0;

        if (!bit_entry(bios, 'P', &bit_P)) {
                if (bit_P.version == 2 && bit_P.length >= 0x5c)
                        fan = nvbios_rd32(bios, bit_P.offset + 0x58);

                if (fan) {
                        *ver = nvbios_rd08(bios, fan + 0);
                        switch (*ver) {
                        case 0x10:
                                *hdr = nvbios_rd08(bios, fan + 1);
                                *len = nvbios_rd08(bios, fan + 2);
                                *cnt = nvbios_rd08(bios, fan + 3);
                                return fan;
                        default:
                                break;
                        }
                }
        }

        return 0;
}

static u32
nvbios_fan_entry(struct nvkm_bios *bios, int idx, u8 *ver, u8 *hdr,
                 u8 *cnt, u8 *len)
{
        u32 data = nvbios_fan_table(bios, ver, hdr, cnt, len);
        if (data && idx < *cnt)
                return data + *hdr + (idx * (*len));
        return 0;
}

u32
nvbios_fan_parse(struct nvkm_bios *bios, struct nvbios_therm_fan *fan)
{
        u8 ver, hdr, cnt, len;

        u32 data = nvbios_fan_entry(bios, 0, &ver, &hdr, &cnt, &len);
        if (data) {
                u8 type = nvbios_rd08(bios, data + 0x00);
                switch (type) {
                case 0:
                        fan->type = NVBIOS_THERM_FAN_TOGGLE;
                        break;
                case 1:
                case 2:
                        /* TODO: Understand the difference between the two! */
                        fan->type = NVBIOS_THERM_FAN_PWM;
                        break;
                default:
                        fan->type = NVBIOS_THERM_FAN_UNK;
                }

                fan->fan_mode = NVBIOS_THERM_FAN_LINEAR;
                fan->min_duty = nvbios_rd08(bios, data + 0x02);
                fan->max_duty = nvbios_rd08(bios, data + 0x03);

                fan->pwm_freq = nvbios_rd32(bios, data + 0x0b) & 0xffffff;
        }

        return data;
}