linux-imx

/* tmp401.c

 *

 * Copyright (C) 2007,2008 Hans de Goede <hdegoede@redhat.com>

 * Preliminary tmp411 support by:

 * Gabriel Konat, Sander Leget, Wouter Willems

 * Copyright (C) 2009 Andre Prendel <andre.prendel@gmx.de>

 *

 * Cleanup and support for TMP431 and TMP432 by Guenter Roeck

 * Copyright (c) 2013 Guenter Roeck <linux@roeck-us.net>

 *

 * 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, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

 */

​

/*

 * Driver for the Texas Instruments TMP401 SMBUS temperature sensor IC.

 *

 * Note this IC is in some aspect similar to the LM90, but it has quite a

 * few differences too, for example the local temp has a higher resolution

 * and thus has 16 bits registers for its value and limit instead of 8 bits.

 */

​

#include <linux/module.h>

#include <linux/init.h>

#include <linux/bitops.h>

#include <linux/slab.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/sysfs.h>

​

/* Addresses to scan */

static const unsigned short normal_i2c[] = { 0x48, 0x49, 0x4a, 0x4c, 0x4d,

    0x4e, 0x4f, I2C_CLIENT_END };

​

enum chips { tmp401, tmp411, tmp431, tmp432, tmp435, tmp461 };

​

/*

 * The TMP401 registers, note some registers have different addresses for

 * reading and writing

 */

#define TMP401_STATUS               0x02

#define TMP401_CONFIG_READ          0x03

#define TMP401_CONFIG_WRITE         0x09

#define TMP401_CONVERSION_RATE_READ     0x04

#define TMP401_CONVERSION_RATE_WRITE        0x0A

#define TMP401_TEMP_CRIT_HYST           0x21

#define TMP401_MANUFACTURER_ID_REG      0xFE

#define TMP401_DEVICE_ID_REG            0xFF