mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-24 01:41:39 +00:00
![Thomas Gleixner](/assets/img/avatar_default.png)
Based on 3 normalized pattern(s): 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 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 [author] [kishon] [vijay] [abraham] [i] [kishon]@[ti] [com] 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 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 [author] [graeme] [gregory] [gg]@[slimlogic] [co] [uk] [author] [kishon] [vijay] [abraham] [i] [kishon]@[ti] [com] [based] [on] [twl6030]_[usb] [c] [author] [hema] [hk] [hemahk]@[ti] [com] 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1105 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.202006027@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
790 lines
21 KiB
C
790 lines
21 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* Hardware monitoring driver for LTC2978 and compatible chips.
|
|
*
|
|
* Copyright (c) 2011 Ericsson AB.
|
|
* Copyright (c) 2013, 2014, 2015 Guenter Roeck
|
|
* Copyright (c) 2015 Linear Technology
|
|
* Copyright (c) 2018 Analog Devices Inc.
|
|
*/
|
|
|
|
#include <linux/delay.h>
|
|
#include <linux/jiffies.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/init.h>
|
|
#include <linux/err.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/i2c.h>
|
|
#include <linux/regulator/driver.h>
|
|
#include "pmbus.h"
|
|
|
|
enum chips { ltc2974, ltc2975, ltc2977, ltc2978, ltc2980, ltc3880, ltc3882,
|
|
ltc3883, ltc3886, ltc3887, ltm2987, ltm4675, ltm4676, ltm4686 };
|
|
|
|
/* Common for all chips */
|
|
#define LTC2978_MFR_VOUT_PEAK 0xdd
|
|
#define LTC2978_MFR_VIN_PEAK 0xde
|
|
#define LTC2978_MFR_TEMPERATURE_PEAK 0xdf
|
|
#define LTC2978_MFR_SPECIAL_ID 0xe7 /* Undocumented on LTC3882 */
|
|
#define LTC2978_MFR_COMMON 0xef
|
|
|
|
/* LTC2974, LTC2975, LCT2977, LTC2980, LTC2978, and LTM2987 */
|
|
#define LTC2978_MFR_VOUT_MIN 0xfb
|
|
#define LTC2978_MFR_VIN_MIN 0xfc
|
|
#define LTC2978_MFR_TEMPERATURE_MIN 0xfd
|
|
|
|
/* LTC2974, LTC2975 */
|
|
#define LTC2974_MFR_IOUT_PEAK 0xd7
|
|
#define LTC2974_MFR_IOUT_MIN 0xd8
|
|
|
|
/* LTC3880, LTC3882, LTC3883, LTC3887, LTM4675, and LTM4676 */
|
|
#define LTC3880_MFR_IOUT_PEAK 0xd7
|
|
#define LTC3880_MFR_CLEAR_PEAKS 0xe3
|
|
#define LTC3880_MFR_TEMPERATURE2_PEAK 0xf4
|
|
|
|
/* LTC3883 and LTC3886 only */
|
|
#define LTC3883_MFR_IIN_PEAK 0xe1
|
|
|
|
/* LTC2975 only */
|
|
#define LTC2975_MFR_IIN_PEAK 0xc4
|
|
#define LTC2975_MFR_IIN_MIN 0xc5
|
|
#define LTC2975_MFR_PIN_PEAK 0xc6
|
|
#define LTC2975_MFR_PIN_MIN 0xc7
|
|
|
|
#define LTC2978_ID_MASK 0xfff0
|
|
|
|
#define LTC2974_ID 0x0210
|
|
#define LTC2975_ID 0x0220
|
|
#define LTC2977_ID 0x0130
|
|
#define LTC2978_ID_REV1 0x0110 /* Early revision */
|
|
#define LTC2978_ID_REV2 0x0120
|
|
#define LTC2980_ID_A 0x8030 /* A/B for two die IDs */
|
|
#define LTC2980_ID_B 0x8040
|
|
#define LTC3880_ID 0x4020
|
|
#define LTC3882_ID 0x4200
|
|
#define LTC3882_ID_D1 0x4240 /* Dash 1 */
|
|
#define LTC3883_ID 0x4300
|
|
#define LTC3886_ID 0x4600
|
|
#define LTC3887_ID 0x4700
|
|
#define LTM2987_ID_A 0x8010 /* A/B for two die IDs */
|
|
#define LTM2987_ID_B 0x8020
|
|
#define LTM4675_ID 0x47a0
|
|
#define LTM4676_ID_REV1 0x4400
|
|
#define LTM4676_ID_REV2 0x4480
|
|
#define LTM4676A_ID 0x47e0
|
|
#define LTM4686_ID 0x4770
|
|
|
|
#define LTC2974_NUM_PAGES 4
|
|
#define LTC2978_NUM_PAGES 8
|
|
#define LTC3880_NUM_PAGES 2
|
|
#define LTC3883_NUM_PAGES 1
|
|
|
|
#define LTC_POLL_TIMEOUT 100 /* in milli-seconds */
|
|
|
|
#define LTC_NOT_BUSY BIT(5)
|
|
#define LTC_NOT_PENDING BIT(4)
|
|
|
|
/*
|
|
* LTC2978 clears peak data whenever the CLEAR_FAULTS command is executed, which
|
|
* happens pretty much each time chip data is updated. Raw peak data therefore
|
|
* does not provide much value. To be able to provide useful peak data, keep an
|
|
* internal cache of measured peak data, which is only cleared if an explicit
|
|
* "clear peak" command is executed for the sensor in question.
|
|
*/
|
|
|
|
struct ltc2978_data {
|
|
enum chips id;
|
|
u16 vin_min, vin_max;
|
|
u16 temp_min[LTC2974_NUM_PAGES], temp_max[LTC2974_NUM_PAGES];
|
|
u16 vout_min[LTC2978_NUM_PAGES], vout_max[LTC2978_NUM_PAGES];
|
|
u16 iout_min[LTC2974_NUM_PAGES], iout_max[LTC2974_NUM_PAGES];
|
|
u16 iin_min, iin_max;
|
|
u16 pin_min, pin_max;
|
|
u16 temp2_max;
|
|
struct pmbus_driver_info info;
|
|
u32 features;
|
|
};
|
|
#define to_ltc2978_data(x) container_of(x, struct ltc2978_data, info)
|
|
|
|
#define FEAT_CLEAR_PEAKS BIT(0)
|
|
#define FEAT_NEEDS_POLLING BIT(1)
|
|
|
|
#define has_clear_peaks(d) ((d)->features & FEAT_CLEAR_PEAKS)
|
|
#define needs_polling(d) ((d)->features & FEAT_NEEDS_POLLING)
|
|
|
|
static int ltc_wait_ready(struct i2c_client *client)
|
|
{
|
|
unsigned long timeout = jiffies + msecs_to_jiffies(LTC_POLL_TIMEOUT);
|
|
const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
|
|
struct ltc2978_data *data = to_ltc2978_data(info);
|
|
int status;
|
|
u8 mask;
|
|
|
|
if (!needs_polling(data))
|
|
return 0;
|
|
|
|
/*
|
|
* LTC3883 does not support LTC_NOT_PENDING, even though
|
|
* the datasheet claims that it does.
|
|
*/
|
|
mask = LTC_NOT_BUSY;
|
|
if (data->id != ltc3883)
|
|
mask |= LTC_NOT_PENDING;
|
|
|
|
do {
|
|
status = pmbus_read_byte_data(client, 0, LTC2978_MFR_COMMON);
|
|
if (status == -EBADMSG || status == -ENXIO) {
|
|
/* PEC error or NACK: chip may be busy, try again */
|
|
usleep_range(50, 100);
|
|
continue;
|
|
}
|
|
if (status < 0)
|
|
return status;
|
|
|
|
if ((status & mask) == mask)
|
|
return 0;
|
|
|
|
usleep_range(50, 100);
|
|
} while (time_before(jiffies, timeout));
|
|
|
|
return -ETIMEDOUT;
|
|
}
|
|
|
|
static int ltc_read_word_data(struct i2c_client *client, int page, int reg)
|
|
{
|
|
int ret;
|
|
|
|
ret = ltc_wait_ready(client);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return pmbus_read_word_data(client, page, reg);
|
|
}
|
|
|
|
static int ltc_read_byte_data(struct i2c_client *client, int page, int reg)
|
|
{
|
|
int ret;
|
|
|
|
ret = ltc_wait_ready(client);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return pmbus_read_byte_data(client, page, reg);
|
|
}
|
|
|
|
static int ltc_write_byte(struct i2c_client *client, int page, u8 byte)
|
|
{
|
|
int ret;
|
|
|
|
ret = ltc_wait_ready(client);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return pmbus_write_byte(client, page, byte);
|
|
}
|
|
|
|
static inline int lin11_to_val(int data)
|
|
{
|
|
s16 e = ((s16)data) >> 11;
|
|
s32 m = (((s16)(data << 5)) >> 5);
|
|
|
|
/*
|
|
* mantissa is 10 bit + sign, exponent adds up to 15 bit.
|
|
* Add 6 bit to exponent for maximum accuracy (10 + 15 + 6 = 31).
|
|
*/
|
|
e += 6;
|
|
return (e < 0 ? m >> -e : m << e);
|
|
}
|
|
|
|
static int ltc_get_max(struct ltc2978_data *data, struct i2c_client *client,
|
|
int page, int reg, u16 *pmax)
|
|
{
|
|
int ret;
|
|
|
|
ret = ltc_read_word_data(client, page, reg);
|
|
if (ret >= 0) {
|
|
if (lin11_to_val(ret) > lin11_to_val(*pmax))
|
|
*pmax = ret;
|
|
ret = *pmax;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int ltc_get_min(struct ltc2978_data *data, struct i2c_client *client,
|
|
int page, int reg, u16 *pmin)
|
|
{
|
|
int ret;
|
|
|
|
ret = ltc_read_word_data(client, page, reg);
|
|
if (ret >= 0) {
|
|
if (lin11_to_val(ret) < lin11_to_val(*pmin))
|
|
*pmin = ret;
|
|
ret = *pmin;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int ltc2978_read_word_data_common(struct i2c_client *client, int page,
|
|
int reg)
|
|
{
|
|
const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
|
|
struct ltc2978_data *data = to_ltc2978_data(info);
|
|
int ret;
|
|
|
|
switch (reg) {
|
|
case PMBUS_VIRT_READ_VIN_MAX:
|
|
ret = ltc_get_max(data, client, page, LTC2978_MFR_VIN_PEAK,
|
|
&data->vin_max);
|
|
break;
|
|
case PMBUS_VIRT_READ_VOUT_MAX:
|
|
ret = ltc_read_word_data(client, page, LTC2978_MFR_VOUT_PEAK);
|
|
if (ret >= 0) {
|
|
/*
|
|
* VOUT is 16 bit unsigned with fixed exponent,
|
|
* so we can compare it directly
|
|
*/
|
|
if (ret > data->vout_max[page])
|
|
data->vout_max[page] = ret;
|
|
ret = data->vout_max[page];
|
|
}
|
|
break;
|
|
case PMBUS_VIRT_READ_TEMP_MAX:
|
|
ret = ltc_get_max(data, client, page,
|
|
LTC2978_MFR_TEMPERATURE_PEAK,
|
|
&data->temp_max[page]);
|
|
break;
|
|
case PMBUS_VIRT_RESET_VOUT_HISTORY:
|
|
case PMBUS_VIRT_RESET_VIN_HISTORY:
|
|
case PMBUS_VIRT_RESET_TEMP_HISTORY:
|
|
ret = 0;
|
|
break;
|
|
default:
|
|
ret = ltc_wait_ready(client);
|
|
if (ret < 0)
|
|
return ret;
|
|
ret = -ENODATA;
|
|
break;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int ltc2978_read_word_data(struct i2c_client *client, int page, int reg)
|
|
{
|
|
const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
|
|
struct ltc2978_data *data = to_ltc2978_data(info);
|
|
int ret;
|
|
|
|
switch (reg) {
|
|
case PMBUS_VIRT_READ_VIN_MIN:
|
|
ret = ltc_get_min(data, client, page, LTC2978_MFR_VIN_MIN,
|
|
&data->vin_min);
|
|
break;
|
|
case PMBUS_VIRT_READ_VOUT_MIN:
|
|
ret = ltc_read_word_data(client, page, LTC2978_MFR_VOUT_MIN);
|
|
if (ret >= 0) {
|
|
/*
|
|
* VOUT_MIN is known to not be supported on some lots
|
|
* of LTC2978 revision 1, and will return the maximum
|
|
* possible voltage if read. If VOUT_MAX is valid and
|
|
* lower than the reading of VOUT_MIN, use it instead.
|
|
*/
|
|
if (data->vout_max[page] && ret > data->vout_max[page])
|
|
ret = data->vout_max[page];
|
|
if (ret < data->vout_min[page])
|
|
data->vout_min[page] = ret;
|
|
ret = data->vout_min[page];
|
|
}
|
|
break;
|
|
case PMBUS_VIRT_READ_TEMP_MIN:
|
|
ret = ltc_get_min(data, client, page,
|
|
LTC2978_MFR_TEMPERATURE_MIN,
|
|
&data->temp_min[page]);
|
|
break;
|
|
case PMBUS_VIRT_READ_IOUT_MAX:
|
|
case PMBUS_VIRT_RESET_IOUT_HISTORY:
|
|
case PMBUS_VIRT_READ_TEMP2_MAX:
|
|
case PMBUS_VIRT_RESET_TEMP2_HISTORY:
|
|
ret = -ENXIO;
|
|
break;
|
|
default:
|
|
ret = ltc2978_read_word_data_common(client, page, reg);
|
|
break;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int ltc2974_read_word_data(struct i2c_client *client, int page, int reg)
|
|
{
|
|
const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
|
|
struct ltc2978_data *data = to_ltc2978_data(info);
|
|
int ret;
|
|
|
|
switch (reg) {
|
|
case PMBUS_VIRT_READ_IOUT_MAX:
|
|
ret = ltc_get_max(data, client, page, LTC2974_MFR_IOUT_PEAK,
|
|
&data->iout_max[page]);
|
|
break;
|
|
case PMBUS_VIRT_READ_IOUT_MIN:
|
|
ret = ltc_get_min(data, client, page, LTC2974_MFR_IOUT_MIN,
|
|
&data->iout_min[page]);
|
|
break;
|
|
case PMBUS_VIRT_RESET_IOUT_HISTORY:
|
|
ret = 0;
|
|
break;
|
|
default:
|
|
ret = ltc2978_read_word_data(client, page, reg);
|
|
break;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int ltc2975_read_word_data(struct i2c_client *client, int page, int reg)
|
|
{
|
|
const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
|
|
struct ltc2978_data *data = to_ltc2978_data(info);
|
|
int ret;
|
|
|
|
switch (reg) {
|
|
case PMBUS_VIRT_READ_IIN_MAX:
|
|
ret = ltc_get_max(data, client, page, LTC2975_MFR_IIN_PEAK,
|
|
&data->iin_max);
|
|
break;
|
|
case PMBUS_VIRT_READ_IIN_MIN:
|
|
ret = ltc_get_min(data, client, page, LTC2975_MFR_IIN_MIN,
|
|
&data->iin_min);
|
|
break;
|
|
case PMBUS_VIRT_READ_PIN_MAX:
|
|
ret = ltc_get_max(data, client, page, LTC2975_MFR_PIN_PEAK,
|
|
&data->pin_max);
|
|
break;
|
|
case PMBUS_VIRT_READ_PIN_MIN:
|
|
ret = ltc_get_min(data, client, page, LTC2975_MFR_PIN_MIN,
|
|
&data->pin_min);
|
|
break;
|
|
case PMBUS_VIRT_RESET_IIN_HISTORY:
|
|
case PMBUS_VIRT_RESET_PIN_HISTORY:
|
|
ret = 0;
|
|
break;
|
|
default:
|
|
ret = ltc2978_read_word_data(client, page, reg);
|
|
break;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int ltc3880_read_word_data(struct i2c_client *client, int page, int reg)
|
|
{
|
|
const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
|
|
struct ltc2978_data *data = to_ltc2978_data(info);
|
|
int ret;
|
|
|
|
switch (reg) {
|
|
case PMBUS_VIRT_READ_IOUT_MAX:
|
|
ret = ltc_get_max(data, client, page, LTC3880_MFR_IOUT_PEAK,
|
|
&data->iout_max[page]);
|
|
break;
|
|
case PMBUS_VIRT_READ_TEMP2_MAX:
|
|
ret = ltc_get_max(data, client, page,
|
|
LTC3880_MFR_TEMPERATURE2_PEAK,
|
|
&data->temp2_max);
|
|
break;
|
|
case PMBUS_VIRT_READ_VIN_MIN:
|
|
case PMBUS_VIRT_READ_VOUT_MIN:
|
|
case PMBUS_VIRT_READ_TEMP_MIN:
|
|
ret = -ENXIO;
|
|
break;
|
|
case PMBUS_VIRT_RESET_IOUT_HISTORY:
|
|
case PMBUS_VIRT_RESET_TEMP2_HISTORY:
|
|
ret = 0;
|
|
break;
|
|
default:
|
|
ret = ltc2978_read_word_data_common(client, page, reg);
|
|
break;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int ltc3883_read_word_data(struct i2c_client *client, int page, int reg)
|
|
{
|
|
const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
|
|
struct ltc2978_data *data = to_ltc2978_data(info);
|
|
int ret;
|
|
|
|
switch (reg) {
|
|
case PMBUS_VIRT_READ_IIN_MAX:
|
|
ret = ltc_get_max(data, client, page, LTC3883_MFR_IIN_PEAK,
|
|
&data->iin_max);
|
|
break;
|
|
case PMBUS_VIRT_RESET_IIN_HISTORY:
|
|
ret = 0;
|
|
break;
|
|
default:
|
|
ret = ltc3880_read_word_data(client, page, reg);
|
|
break;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static int ltc2978_clear_peaks(struct ltc2978_data *data,
|
|
struct i2c_client *client, int page)
|
|
{
|
|
int ret;
|
|
|
|
if (has_clear_peaks(data))
|
|
ret = ltc_write_byte(client, 0, LTC3880_MFR_CLEAR_PEAKS);
|
|
else
|
|
ret = ltc_write_byte(client, page, PMBUS_CLEAR_FAULTS);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int ltc2978_write_word_data(struct i2c_client *client, int page,
|
|
int reg, u16 word)
|
|
{
|
|
const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
|
|
struct ltc2978_data *data = to_ltc2978_data(info);
|
|
int ret;
|
|
|
|
switch (reg) {
|
|
case PMBUS_VIRT_RESET_IIN_HISTORY:
|
|
data->iin_max = 0x7c00;
|
|
data->iin_min = 0x7bff;
|
|
ret = ltc2978_clear_peaks(data, client, 0);
|
|
break;
|
|
case PMBUS_VIRT_RESET_PIN_HISTORY:
|
|
data->pin_max = 0x7c00;
|
|
data->pin_min = 0x7bff;
|
|
ret = ltc2978_clear_peaks(data, client, 0);
|
|
break;
|
|
case PMBUS_VIRT_RESET_IOUT_HISTORY:
|
|
data->iout_max[page] = 0x7c00;
|
|
data->iout_min[page] = 0xfbff;
|
|
ret = ltc2978_clear_peaks(data, client, page);
|
|
break;
|
|
case PMBUS_VIRT_RESET_TEMP2_HISTORY:
|
|
data->temp2_max = 0x7c00;
|
|
ret = ltc2978_clear_peaks(data, client, page);
|
|
break;
|
|
case PMBUS_VIRT_RESET_VOUT_HISTORY:
|
|
data->vout_min[page] = 0xffff;
|
|
data->vout_max[page] = 0;
|
|
ret = ltc2978_clear_peaks(data, client, page);
|
|
break;
|
|
case PMBUS_VIRT_RESET_VIN_HISTORY:
|
|
data->vin_min = 0x7bff;
|
|
data->vin_max = 0x7c00;
|
|
ret = ltc2978_clear_peaks(data, client, page);
|
|
break;
|
|
case PMBUS_VIRT_RESET_TEMP_HISTORY:
|
|
data->temp_min[page] = 0x7bff;
|
|
data->temp_max[page] = 0x7c00;
|
|
ret = ltc2978_clear_peaks(data, client, page);
|
|
break;
|
|
default:
|
|
ret = ltc_wait_ready(client);
|
|
if (ret < 0)
|
|
return ret;
|
|
ret = -ENODATA;
|
|
break;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static const struct i2c_device_id ltc2978_id[] = {
|
|
{"ltc2974", ltc2974},
|
|
{"ltc2975", ltc2975},
|
|
{"ltc2977", ltc2977},
|
|
{"ltc2978", ltc2978},
|
|
{"ltc2980", ltc2980},
|
|
{"ltc3880", ltc3880},
|
|
{"ltc3882", ltc3882},
|
|
{"ltc3883", ltc3883},
|
|
{"ltc3886", ltc3886},
|
|
{"ltc3887", ltc3887},
|
|
{"ltm2987", ltm2987},
|
|
{"ltm4675", ltm4675},
|
|
{"ltm4676", ltm4676},
|
|
{"ltm4686", ltm4686},
|
|
{}
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, ltc2978_id);
|
|
|
|
#if IS_ENABLED(CONFIG_SENSORS_LTC2978_REGULATOR)
|
|
static const struct regulator_desc ltc2978_reg_desc[] = {
|
|
PMBUS_REGULATOR("vout", 0),
|
|
PMBUS_REGULATOR("vout", 1),
|
|
PMBUS_REGULATOR("vout", 2),
|
|
PMBUS_REGULATOR("vout", 3),
|
|
PMBUS_REGULATOR("vout", 4),
|
|
PMBUS_REGULATOR("vout", 5),
|
|
PMBUS_REGULATOR("vout", 6),
|
|
PMBUS_REGULATOR("vout", 7),
|
|
};
|
|
#endif /* CONFIG_SENSORS_LTC2978_REGULATOR */
|
|
|
|
static int ltc2978_get_id(struct i2c_client *client)
|
|
{
|
|
int chip_id;
|
|
|
|
chip_id = i2c_smbus_read_word_data(client, LTC2978_MFR_SPECIAL_ID);
|
|
if (chip_id < 0) {
|
|
const struct i2c_device_id *id;
|
|
u8 buf[I2C_SMBUS_BLOCK_MAX];
|
|
int ret;
|
|
|
|
if (!i2c_check_functionality(client->adapter,
|
|
I2C_FUNC_SMBUS_READ_BLOCK_DATA))
|
|
return -ENODEV;
|
|
|
|
ret = i2c_smbus_read_block_data(client, PMBUS_MFR_ID, buf);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (ret < 3 || strncmp(buf, "LTC", 3))
|
|
return -ENODEV;
|
|
|
|
ret = i2c_smbus_read_block_data(client, PMBUS_MFR_MODEL, buf);
|
|
if (ret < 0)
|
|
return ret;
|
|
for (id = <c2978_id[0]; strlen(id->name); id++) {
|
|
if (!strncasecmp(id->name, buf, strlen(id->name)))
|
|
return (int)id->driver_data;
|
|
}
|
|
return -ENODEV;
|
|
}
|
|
|
|
chip_id &= LTC2978_ID_MASK;
|
|
|
|
if (chip_id == LTC2974_ID)
|
|
return ltc2974;
|
|
else if (chip_id == LTC2975_ID)
|
|
return ltc2975;
|
|
else if (chip_id == LTC2977_ID)
|
|
return ltc2977;
|
|
else if (chip_id == LTC2978_ID_REV1 || chip_id == LTC2978_ID_REV2)
|
|
return ltc2978;
|
|
else if (chip_id == LTC2980_ID_A || chip_id == LTC2980_ID_B)
|
|
return ltc2980;
|
|
else if (chip_id == LTC3880_ID)
|
|
return ltc3880;
|
|
else if (chip_id == LTC3882_ID || chip_id == LTC3882_ID_D1)
|
|
return ltc3882;
|
|
else if (chip_id == LTC3883_ID)
|
|
return ltc3883;
|
|
else if (chip_id == LTC3886_ID)
|
|
return ltc3886;
|
|
else if (chip_id == LTC3887_ID)
|
|
return ltc3887;
|
|
else if (chip_id == LTM2987_ID_A || chip_id == LTM2987_ID_B)
|
|
return ltm2987;
|
|
else if (chip_id == LTM4675_ID)
|
|
return ltm4675;
|
|
else if (chip_id == LTM4676_ID_REV1 || chip_id == LTM4676_ID_REV2 ||
|
|
chip_id == LTM4676A_ID)
|
|
return ltm4676;
|
|
else if (chip_id == LTM4686_ID)
|
|
return ltm4686;
|
|
|
|
dev_err(&client->dev, "Unsupported chip ID 0x%x\n", chip_id);
|
|
return -ENODEV;
|
|
}
|
|
|
|
static int ltc2978_probe(struct i2c_client *client,
|
|
const struct i2c_device_id *id)
|
|
{
|
|
int i, chip_id;
|
|
struct ltc2978_data *data;
|
|
struct pmbus_driver_info *info;
|
|
|
|
if (!i2c_check_functionality(client->adapter,
|
|
I2C_FUNC_SMBUS_READ_WORD_DATA))
|
|
return -ENODEV;
|
|
|
|
data = devm_kzalloc(&client->dev, sizeof(struct ltc2978_data),
|
|
GFP_KERNEL);
|
|
if (!data)
|
|
return -ENOMEM;
|
|
|
|
chip_id = ltc2978_get_id(client);
|
|
if (chip_id < 0)
|
|
return chip_id;
|
|
|
|
data->id = chip_id;
|
|
if (data->id != id->driver_data)
|
|
dev_warn(&client->dev,
|
|
"Device mismatch: Configured %s, detected %s\n",
|
|
id->name,
|
|
ltc2978_id[data->id].name);
|
|
|
|
info = &data->info;
|
|
info->write_word_data = ltc2978_write_word_data;
|
|
info->write_byte = ltc_write_byte;
|
|
info->read_word_data = ltc_read_word_data;
|
|
info->read_byte_data = ltc_read_byte_data;
|
|
|
|
data->vin_min = 0x7bff;
|
|
data->vin_max = 0x7c00;
|
|
for (i = 0; i < ARRAY_SIZE(data->vout_min); i++)
|
|
data->vout_min[i] = 0xffff;
|
|
for (i = 0; i < ARRAY_SIZE(data->iout_min); i++)
|
|
data->iout_min[i] = 0xfbff;
|
|
for (i = 0; i < ARRAY_SIZE(data->iout_max); i++)
|
|
data->iout_max[i] = 0x7c00;
|
|
for (i = 0; i < ARRAY_SIZE(data->temp_min); i++)
|
|
data->temp_min[i] = 0x7bff;
|
|
for (i = 0; i < ARRAY_SIZE(data->temp_max); i++)
|
|
data->temp_max[i] = 0x7c00;
|
|
data->temp2_max = 0x7c00;
|
|
|
|
switch (data->id) {
|
|
case ltc2974:
|
|
info->read_word_data = ltc2974_read_word_data;
|
|
info->pages = LTC2974_NUM_PAGES;
|
|
info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT
|
|
| PMBUS_HAVE_TEMP2;
|
|
for (i = 0; i < info->pages; i++) {
|
|
info->func[i] |= PMBUS_HAVE_VOUT
|
|
| PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_POUT
|
|
| PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP
|
|
| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT;
|
|
}
|
|
break;
|
|
case ltc2975:
|
|
info->read_word_data = ltc2975_read_word_data;
|
|
info->pages = LTC2974_NUM_PAGES;
|
|
info->func[0] = PMBUS_HAVE_IIN | PMBUS_HAVE_PIN
|
|
| PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT
|
|
| PMBUS_HAVE_TEMP2;
|
|
for (i = 0; i < info->pages; i++) {
|
|
info->func[i] |= PMBUS_HAVE_VOUT
|
|
| PMBUS_HAVE_STATUS_VOUT | PMBUS_HAVE_POUT
|
|
| PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP
|
|
| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT;
|
|
}
|
|
break;
|
|
case ltc2977:
|
|
case ltc2978:
|
|
case ltc2980:
|
|
case ltm2987:
|
|
info->read_word_data = ltc2978_read_word_data;
|
|
info->pages = LTC2978_NUM_PAGES;
|
|
info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_STATUS_INPUT
|
|
| PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
|
|
| PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
|
|
for (i = 1; i < LTC2978_NUM_PAGES; i++) {
|
|
info->func[i] = PMBUS_HAVE_VOUT
|
|
| PMBUS_HAVE_STATUS_VOUT;
|
|
}
|
|
break;
|
|
case ltc3880:
|
|
case ltc3887:
|
|
case ltm4675:
|
|
case ltm4676:
|
|
case ltm4686:
|
|
data->features |= FEAT_CLEAR_PEAKS | FEAT_NEEDS_POLLING;
|
|
info->read_word_data = ltc3880_read_word_data;
|
|
info->pages = LTC3880_NUM_PAGES;
|
|
info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN
|
|
| PMBUS_HAVE_STATUS_INPUT
|
|
| PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
|
|
| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
|
|
| PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP
|
|
| PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP;
|
|
info->func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
|
|
| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
|
|
| PMBUS_HAVE_POUT
|
|
| PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
|
|
break;
|
|
case ltc3882:
|
|
data->features |= FEAT_CLEAR_PEAKS | FEAT_NEEDS_POLLING;
|
|
info->read_word_data = ltc3880_read_word_data;
|
|
info->pages = LTC3880_NUM_PAGES;
|
|
info->func[0] = PMBUS_HAVE_VIN
|
|
| PMBUS_HAVE_STATUS_INPUT
|
|
| PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
|
|
| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
|
|
| PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP
|
|
| PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP;
|
|
info->func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
|
|
| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
|
|
| PMBUS_HAVE_POUT
|
|
| PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
|
|
break;
|
|
case ltc3883:
|
|
data->features |= FEAT_CLEAR_PEAKS | FEAT_NEEDS_POLLING;
|
|
info->read_word_data = ltc3883_read_word_data;
|
|
info->pages = LTC3883_NUM_PAGES;
|
|
info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN
|
|
| PMBUS_HAVE_STATUS_INPUT
|
|
| PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
|
|
| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
|
|
| PMBUS_HAVE_PIN | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP
|
|
| PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP;
|
|
break;
|
|
case ltc3886:
|
|
data->features |= FEAT_CLEAR_PEAKS | FEAT_NEEDS_POLLING;
|
|
info->read_word_data = ltc3883_read_word_data;
|
|
info->pages = LTC3880_NUM_PAGES;
|
|
info->func[0] = PMBUS_HAVE_VIN | PMBUS_HAVE_IIN
|
|
| PMBUS_HAVE_STATUS_INPUT
|
|
| PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
|
|
| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
|
|
| PMBUS_HAVE_PIN | PMBUS_HAVE_POUT | PMBUS_HAVE_TEMP
|
|
| PMBUS_HAVE_TEMP2 | PMBUS_HAVE_STATUS_TEMP;
|
|
info->func[1] = PMBUS_HAVE_VOUT | PMBUS_HAVE_STATUS_VOUT
|
|
| PMBUS_HAVE_IOUT | PMBUS_HAVE_STATUS_IOUT
|
|
| PMBUS_HAVE_POUT
|
|
| PMBUS_HAVE_TEMP | PMBUS_HAVE_STATUS_TEMP;
|
|
break;
|
|
default:
|
|
return -ENODEV;
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_SENSORS_LTC2978_REGULATOR)
|
|
info->num_regulators = info->pages;
|
|
info->reg_desc = ltc2978_reg_desc;
|
|
if (info->num_regulators > ARRAY_SIZE(ltc2978_reg_desc)) {
|
|
dev_err(&client->dev, "num_regulators too large!");
|
|
info->num_regulators = ARRAY_SIZE(ltc2978_reg_desc);
|
|
}
|
|
#endif
|
|
|
|
return pmbus_do_probe(client, id, info);
|
|
}
|
|
|
|
#ifdef CONFIG_OF
|
|
static const struct of_device_id ltc2978_of_match[] = {
|
|
{ .compatible = "lltc,ltc2974" },
|
|
{ .compatible = "lltc,ltc2975" },
|
|
{ .compatible = "lltc,ltc2977" },
|
|
{ .compatible = "lltc,ltc2978" },
|
|
{ .compatible = "lltc,ltc2980" },
|
|
{ .compatible = "lltc,ltc3880" },
|
|
{ .compatible = "lltc,ltc3882" },
|
|
{ .compatible = "lltc,ltc3883" },
|
|
{ .compatible = "lltc,ltc3886" },
|
|
{ .compatible = "lltc,ltc3887" },
|
|
{ .compatible = "lltc,ltm2987" },
|
|
{ .compatible = "lltc,ltm4675" },
|
|
{ .compatible = "lltc,ltm4676" },
|
|
{ .compatible = "lltc,ltm4686" },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, ltc2978_of_match);
|
|
#endif
|
|
|
|
static struct i2c_driver ltc2978_driver = {
|
|
.driver = {
|
|
.name = "ltc2978",
|
|
.of_match_table = of_match_ptr(ltc2978_of_match),
|
|
},
|
|
.probe = ltc2978_probe,
|
|
.remove = pmbus_do_remove,
|
|
.id_table = ltc2978_id,
|
|
};
|
|
|
|
module_i2c_driver(ltc2978_driver);
|
|
|
|
MODULE_AUTHOR("Guenter Roeck");
|
|
MODULE_DESCRIPTION("PMBus driver for LTC2978 and compatible chips");
|
|
MODULE_LICENSE("GPL");
|