Commit f76992b0 authored by Guenter Roeck's avatar Guenter Roeck
Browse files

hwmon: (pmbus/ltc2978) Add support for LTM4676 



The chip's programming interface is quite similar to LTC3880
and supports the same set of sensors.

Reviewed-by: default avatarRobert Coulson <rob.coulson@gmail.com>
Signed-off-by: default avatarGuenter Roeck <linux@roeck-us.net>
parent a2e15107

Documentation/hwmon/ltc2978

+11 −6
Original line number Diff line number Diff line
@@ -23,6 +23,10 @@ Supported chips: 
    Prefix: 'ltc3883'

    Addresses scanned: -

    Datasheet: http://www.linear.com/product/ltc3883

  * Linear Technology LTM4676

    Prefix: 'ltm4676'

    Addresses scanned: -

    Datasheet: http://www.linear.com/product/ltm4676



Author: Guenter Roeck <linux@roeck-us.net>
@@ -33,7 +37,8 @@ Description 
LTC2974 is a quad digital power supply manager. LTC2978 is an octal power supply

monitor. LTC2977 is a pin compatible replacement for LTC2978. LTC3880 is a dual

output poly-phase step-down DC/DC controller. LTC3883 is a single phase

step-down DC/DC controller.

step-down DC/DC controller. LTM4676 is a dual 13A or single 26A uModule

regulator.





Usage Notes
@@ -75,7 +80,7 @@ in[N]_label "vout[1-8]". 
			LTC2974: N=2-5

			LTC2977: N=2-9

			LTC2978: N=2-9

			LTC3880: N=2-3

			LTC3880, LTM4676: N=2-3

			LTC3883: N=2

in[N]_input		Measured output voltage.

in[N]_min		Minimum output voltage.
@@ -95,7 +100,7 @@ temp[N]_input Measured temperature. 
			and temp5 reports the chip temperature.

			On LTC2977 and LTC2978, only one temperature measurement

			is supported and reports the chip temperature.

			On LTC3880, temp1 and temp2 report external

			On LTC3880 and LTM4676, temp1 and temp2 report external

			temperatures, and temp3 reports the chip temperature.

			On LTC3883, temp1 reports an external temperature,

			and temp2 reports the chip temperature.
@@ -123,11 +128,11 @@ power[N]_label "pout[1-4]". 
			LTC2974: N=1-4

			LTC2977: Not supported

			LTC2978: Not supported

			LTC3880: N=1-2

			LTC3880, LTM4676: N=1-2

			LTC3883: N=2

power[N]_input		Measured output power.



curr1_label		"iin". LTC3880 and LTC3883 only.

curr1_label		"iin". LTC3880, LTC3883, and LTM4676 only.

curr1_input		Measured input current.

curr1_max		Maximum input current.

curr1_max_alarm		Input current high alarm.
@@ -138,7 +143,7 @@ curr[N]_label "iout[1-4]". 
			LTC2974: N=1-4

			LTC2977: not supported

			LTC2978: not supported

			LTC3880: N=2-3

			LTC3880, LTM4676: N=2-3

			LTC3883: N=2

curr[N]_input		Measured output current.

curr[N]_max		Maximum output current.

drivers/hwmon/pmbus/ltc2978.c

+11 −9
Original line number Diff line number Diff line 
/*

 * Hardware monitoring driver for LTC2974, LTC2977, LTC2978, LTC3880,

 * and LTC3883

 * LTC3883, and LTM4676

 *

 * Copyright (c) 2011 Ericsson AB.

 * Copyright (c) 2013 Guenter Roeck

 * Copyright (c) 2013, 2014 Guenter Roeck

 *

 * 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
@@ -14,10 +14,6 @@ 
 * 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.

 */



#include <linux/kernel.h>
@@ -28,7 +24,7 @@ 
#include <linux/i2c.h>

#include "pmbus.h"



enum chips { ltc2974, ltc2977, ltc2978, ltc3880, ltc3883 };

enum chips { ltc2974, ltc2977, ltc2978, ltc3880, ltc3883, ltm4676 };



/* Common for all chips */

#define LTC2978_MFR_VOUT_PEAK		0xdd
@@ -45,7 +41,7 @@ enum chips { ltc2974, ltc2977, ltc2978, ltc3880, ltc3883 }; 
#define LTC2974_MFR_IOUT_PEAK		0xd7

#define LTC2974_MFR_IOUT_MIN		0xd8



/* LTC3880 and LTC3883 */

/* LTC3880, LTC3883, and LTM4676 */

#define LTC3880_MFR_IOUT_PEAK		0xd7

#define LTC3880_MFR_CLEAR_PEAKS		0xe3

#define LTC3880_MFR_TEMPERATURE2_PEAK	0xf4
@@ -63,6 +59,8 @@ enum chips { ltc2974, ltc2977, ltc2978, ltc3880, ltc3883 }; 
#define LTC3880_ID_MASK			0xff00

#define LTC3883_ID			0x4300

#define LTC3883_ID_MASK			0xff00

#define LTM4676_ID			0x4480	/* datasheet claims 0x440X */

#define LTM4676_ID_MASK			0xfff0



#define LTC2974_NUM_PAGES		4

#define LTC2978_NUM_PAGES		8
@@ -371,6 +369,7 @@ static const struct i2c_device_id ltc2978_id[] = { 
	{"ltc2978", ltc2978},

	{"ltc3880", ltc3880},

	{"ltc3883", ltc3883},

	{"ltm4676", ltm4676},

	{}

};

MODULE_DEVICE_TABLE(i2c, ltc2978_id);
@@ -406,6 +405,8 @@ static int ltc2978_probe(struct i2c_client *client, 
		data->id = ltc3880;

	} else if ((chip_id & LTC3883_ID_MASK) == LTC3883_ID) {

		data->id = ltc3883;

	} else if ((chip_id & LTM4676_ID_MASK) == LTM4676_ID) {

		data->id = ltm4676;

	} else {

		dev_err(&client->dev, "Unsupported chip ID 0x%x\n", chip_id);

		return -ENODEV;
@@ -459,6 +460,7 @@ static int ltc2978_probe(struct i2c_client *client, 
		}

		break;

	case ltc3880:

	case ltm4676:

		info->read_word_data = ltc3880_read_word_data;

		info->pages = LTC3880_NUM_PAGES;

		info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN
@@ -501,5 +503,5 @@ static struct i2c_driver ltc2978_driver = { 
module_i2c_driver(ltc2978_driver);



MODULE_AUTHOR("Guenter Roeck");

MODULE_DESCRIPTION("PMBus driver for LTC2974, LTC2978, LTC3880, and LTC3883");

MODULE_DESCRIPTION("PMBus driver for LTC2974, LTC2978, LTC3880, LTC3883, and LTM4676");

MODULE_LICENSE("GPL");