linux-imx

/*

 * g762 - Driver for the Global Mixed-mode Technology Inc. fan speed

 *        PWM controller chips from G762 family, i.e. G762 and G763

 *

 * Copyright (C) 2013, Arnaud EBALARD <arno@natisbad.org>

 *

 * This work is based on a basic version for 2.6.31 kernel developed

 * by Olivier Mouchet for LaCie. Updates and correction have been

 * performed to run on recent kernels. Additional features, like the

 * ability to configure various characteristics via .dts file or

 * board init file have been added. Detailed datasheet on which this

 * development is based is available here:

 *

 *  http://natisbad.org/NAS/refs/GMT_EDS-762_763-080710-0.2.pdf

 *

 * Headers from previous developments have been kept below:

 *

 * Copyright (c) 2009 LaCie

 *

 * Author: Olivier Mouchet <olivier.mouchet@gmail.com>

 *

 * based on g760a code written by Herbert Valerio Riedel <hvr@gnu.org>

 * Copyright (C) 2007  Herbert Valerio Riedel <hvr@gnu.org>

 *

 * g762: minimal datasheet available at:

 *       http://www.gmt.com.tw/product/datasheet/EDS-762_3.pdf

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation.

 */

​

#include <linux/device.h>

#include <linux/module.h>

#include <linux/init.h>

#include <linux/jiffies.h>

#include <linux/i2c.h>

#include <linux/hwmon.h>

#include <linux/hwmon-sysfs.h>

#include <linux/err.h>

#include <linux/mutex.h>

#include <linux/kernel.h>

#include <linux/clk.h>

#include <linux/of.h>

#include <linux/of_device.h>

#include <linux/platform_data/g762.h>

​

#define DRVNAME "g762"

​

static const struct i2c_device_id g762_id[] = {

    { "g762", 0 },

    { "g763", 0 },

    { }

};

MODULE_DEVICE_TABLE(i2c, g762_id);

​

enum g762_regs {

    G762_REG_SET_CNT  = 0x00,

    G762_REG_ACT_CNT  = 0x01,

    G762_REG_FAN_STA  = 0x02,

    G762_REG_SET_OUT  = 0x03,

    G762_REG_FAN_CMD1 = 0x04,

    G762_REG_FAN_CMD2 = 0x05,

};

​

/* Config register bits */

#define G762_REG_FAN_CMD1_DET_FAN_FAIL  0x80 /* enable fan_fail signal */

#define G762_REG_FAN_CMD1_DET_FAN_OOC   0x40 /* enable fan_out_of_control */

#define G762_REG_FAN_CMD1_OUT_MODE      0x20 /* out mode: PWM or DC */

#define G762_REG_FAN_CMD1_FAN_MODE      0x10 /* fan mode: closed/open-loop */

#define G762_REG_FAN_CMD1_CLK_DIV_ID1   0x08 /* clock divisor value */

#define G762_REG_FAN_CMD1_CLK_DIV_ID0   0x04

#define G762_REG_FAN_CMD1_PWM_POLARITY  0x02 /* PWM polarity */

#define G762_REG_FAN_CMD1_PULSE_PER_REV 0x01 /* pulse per fan revolution */

​

#define G762_REG_FAN_CMD2_GEAR_MODE_1   0x08 /* fan gear mode */

#define G762_REG_FAN_CMD2_GEAR_MODE_0   0x04

#define G762_REG_FAN_CMD2_FAN_STARTV_1  0x02 /* fan startup voltage */

#define G762_REG_FAN_CMD2_FAN_STARTV_0  0x01

​

#define G762_REG_FAN_STA_FAIL           0x02 /* fan fail */

#define G762_REG_FAN_STA_OOC            0x01 /* fan out of control */