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hwmon: (pmbus/ltc2978) Add support for LTM4676

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

Reviewed-by: Robert Coulson <rob.coulson@gmail.com>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Guenter Roeck 2014-03-05 21:23:01 -08:00
parent a2e1510743
commit f76992b00a
2 changed files with 22 additions and 15 deletions
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17
Documentation/hwmon/ltc2978
View File

@ -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.

20
drivers/hwmon/pmbus/ltc2978.c
View File

@ -1,9 +1,9 @@
/*
* 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");