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linux-zen-server/drivers/hwmon/pmbus/ltc2978.c

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// 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 {
/* Managers */
ltc2972, ltc2974, ltc2975, ltc2977, ltc2978, ltc2979, ltc2980,
/* Controllers */
ltc3880, ltc3882, ltc3883, ltc3884, ltc3886, ltc3887, ltc3889, ltc7132, ltc7880,
/* Modules */
ltm2987, ltm4664, ltm4675, ltm4676, ltm4677, ltm4678, ltm4680, ltm4686,
ltm4700,
};
/* 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, LTM4676, LTC7132 */
#define LTC3880_MFR_IOUT_PEAK 0xd7
#define LTC3880_MFR_CLEAR_PEAKS 0xe3
#define LTC3880_MFR_TEMPERATURE2_PEAK 0xf4
/* LTC3883, LTC3884, LTC3886, LTC3889, LTC7132, LTC7880 */
#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 LTC2972_ID 0x0310
#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 LTC2979_ID_A 0x8060
#define LTC2979_ID_B 0x8070
#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 LTC3884_ID 0x4C00
#define LTC3886_ID 0x4600
#define LTC3887_ID 0x4700
#define LTC3889_ID 0x4900
#define LTC7132_ID 0x4CE0
#define LTC7880_ID 0x49E0
#define LTM2987_ID_A 0x8010 /* A/B for two die IDs */
#define LTM2987_ID_B 0x8020
#define LTM4664_ID 0x4120
#define LTM4675_ID 0x47a0
#define LTM4676_ID_REV1 0x4400
#define LTM4676_ID_REV2 0x4480
#define LTM4676A_ID 0x47e0
#define LTM4677_ID_REV1 0x47B0
#define LTM4677_ID_REV2 0x47D0
#define LTM4678_ID_REV1 0x4100
#define LTM4678_ID_REV2 0x4110
#define LTM4680_ID 0x4140
#define LTM4686_ID 0x4770
#define LTM4700_ID 0x4130
#define LTC2972_NUM_PAGES 2
#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(6)
#define LTC_NOT_PENDING BIT(5)
/*
* 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 phase,
int reg)
{
int ret;
ret = ltc_wait_ready(client);
if (ret < 0)
return ret;
return pmbus_read_word_data(client, page, 0xff, 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_data(struct i2c_client *client, int page, int reg, u8 value)
{
int ret;
ret = ltc_wait_ready(client);
if (ret < 0)
return ret;
return pmbus_write_byte_data(client, page, reg, value);
}
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, 0xff, 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, 0xff, 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, 0xff,
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 phase, 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, phase,
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 phase, 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, phase, reg);
break;
}
return ret;
}
static int ltc2975_read_word_data(struct i2c_client *client, int page,
int phase, 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, phase, reg);
break;
}
return ret;
}
static int ltc3880_read_word_data(struct i2c_client *client, int page,
int phase, 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 phase, 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, phase, 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[] = {
{"ltc2972", ltc2972},
{"ltc2974", ltc2974},
{"ltc2975", ltc2975},
{"ltc2977", ltc2977},
{"ltc2978", ltc2978},
{"ltc2979", ltc2979},
{"ltc2980", ltc2980},
{"ltc3880", ltc3880},
{"ltc3882", ltc3882},
{"ltc3883", ltc3883},
{"ltc3884", ltc3884},
{"ltc3886", ltc3886},
{"ltc3887", ltc3887},
{"ltc3889", ltc3889},
{"ltc7132", ltc7132},
{"ltc7880", ltc7880},
{"ltm2987", ltm2987},
{"ltm4664", ltm4664},
{"ltm4675", ltm4675},
{"ltm4676", ltm4676},
{"ltm4677", ltm4677},
{"ltm4678", ltm4678},
{"ltm4680", ltm4680},
{"ltm4686", ltm4686},
{"ltm4700", ltm4700},
{}
};
MODULE_DEVICE_TABLE(i2c, ltc2978_id);
#if IS_ENABLED(CONFIG_SENSORS_LTC2978_REGULATOR)
#define LTC2978_ADC_RES 0xFFFF
#define LTC2978_N_ADC 122
#define LTC2978_MAX_UV (LTC2978_ADC_RES * LTC2978_N_ADC)
#define LTC2978_UV_STEP 1000
#define LTC2978_N_VOLTAGES ((LTC2978_MAX_UV / LTC2978_UV_STEP) + 1)
static const struct regulator_desc ltc2978_reg_desc[] = {
PMBUS_REGULATOR_STEP("vout", 0, LTC2978_N_VOLTAGES, LTC2978_UV_STEP, 0),
PMBUS_REGULATOR_STEP("vout", 1, LTC2978_N_VOLTAGES, LTC2978_UV_STEP, 0),
PMBUS_REGULATOR_STEP("vout", 2, LTC2978_N_VOLTAGES, LTC2978_UV_STEP, 0),
PMBUS_REGULATOR_STEP("vout", 3, LTC2978_N_VOLTAGES, LTC2978_UV_STEP, 0),
PMBUS_REGULATOR_STEP("vout", 4, LTC2978_N_VOLTAGES, LTC2978_UV_STEP, 0),
PMBUS_REGULATOR_STEP("vout", 5, LTC2978_N_VOLTAGES, LTC2978_UV_STEP, 0),
PMBUS_REGULATOR_STEP("vout", 6, LTC2978_N_VOLTAGES, LTC2978_UV_STEP, 0),
PMBUS_REGULATOR_STEP("vout", 7, LTC2978_N_VOLTAGES, LTC2978_UV_STEP, 0),
};
static const struct regulator_desc ltc2978_reg_desc_default[] = {
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 = &ltc2978_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 == LTC2972_ID)
return ltc2972;
else 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 == LTC2979_ID_A || chip_id == LTC2979_ID_B)
return ltc2979;
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 == LTC3884_ID)
return ltc3884;
else if (chip_id == LTC3886_ID)
return ltc3886;
else if (chip_id == LTC3887_ID)
return ltc3887;
else if (chip_id == LTC3889_ID)
return ltc3889;
else if (chip_id == LTC7132_ID)
return ltc7132;
else if (chip_id == LTC7880_ID)
return ltc7880;
else if (chip_id == LTM2987_ID_A || chip_id == LTM2987_ID_B)
return ltm2987;
else if (chip_id == LTM4664_ID)
return ltm4664;
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 == LTM4677_ID_REV1 || chip_id == LTM4677_ID_REV2)
return ltm4677;
else if (chip_id == LTM4678_ID_REV1 || chip_id == LTM4678_ID_REV2)
return ltm4678;
else if (chip_id == LTM4680_ID)
return ltm4680;
else if (chip_id == LTM4686_ID)
return ltm4686;
else if (chip_id == LTM4700_ID)
return ltm4700;
dev_err(&client->dev, "Unsupported chip ID 0x%x\n", chip_id);
return -ENODEV;
}
static int ltc2978_probe(struct i2c_client *client)
{
int i, chip_id;
struct ltc2978_data *data;
struct pmbus_driver_info *info;
const struct i2c_device_id *id;
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;
id = i2c_match_id(ltc2978_id, client);
if (data->id != id->driver_data)
dev_warn(&client->dev,
"Device mismatch: Configured %s (%d), detected %d\n",
id->name,
(int) id->driver_data,
chip_id);
info = &data->info;
info->write_word_data = ltc2978_write_word_data;
info->write_byte = ltc_write_byte;
info->write_byte_data = ltc_write_byte_data;
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 ltc2972:
info->read_word_data = ltc2975_read_word_data;
info->pages = LTC2972_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 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 ltc2979:
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 ltm4677:
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 ltc3884:
case ltc3886:
case ltc3889:
case ltc7132:
case ltc7880:
case ltm4664:
case ltm4678:
case ltm4680:
case ltm4700:
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;
switch (data->id) {
case ltc2972:
case ltc2974:
case ltc2975:
case ltc2977:
case ltc2978:
case ltc2979:
case ltc2980:
case ltm2987:
info->reg_desc = ltc2978_reg_desc;
if (info->num_regulators > ARRAY_SIZE(ltc2978_reg_desc)) {
dev_warn(&client->dev, "num_regulators too large!");
info->num_regulators = ARRAY_SIZE(ltc2978_reg_desc);
}
break;
default:
info->reg_desc = ltc2978_reg_desc_default;
if (info->num_regulators > ARRAY_SIZE(ltc2978_reg_desc_default)) {
dev_warn(&client->dev, "num_regulators too large!");
info->num_regulators =
ARRAY_SIZE(ltc2978_reg_desc_default);
}
break;
}
#endif
return pmbus_do_probe(client, info);
}
#ifdef CONFIG_OF
static const struct of_device_id ltc2978_of_match[] = {
{ .compatible = "lltc,ltc2972" },
{ .compatible = "lltc,ltc2974" },
{ .compatible = "lltc,ltc2975" },
{ .compatible = "lltc,ltc2977" },
{ .compatible = "lltc,ltc2978" },
{ .compatible = "lltc,ltc2979" },
{ .compatible = "lltc,ltc2980" },
{ .compatible = "lltc,ltc3880" },
{ .compatible = "lltc,ltc3882" },
{ .compatible = "lltc,ltc3883" },
{ .compatible = "lltc,ltc3884" },
{ .compatible = "lltc,ltc3886" },
{ .compatible = "lltc,ltc3887" },
{ .compatible = "lltc,ltc3889" },
{ .compatible = "lltc,ltc7132" },
{ .compatible = "lltc,ltc7880" },
{ .compatible = "lltc,ltm2987" },
{ .compatible = "lltc,ltm4664" },
{ .compatible = "lltc,ltm4675" },
{ .compatible = "lltc,ltm4676" },
{ .compatible = "lltc,ltm4677" },
{ .compatible = "lltc,ltm4678" },
{ .compatible = "lltc,ltm4680" },
{ .compatible = "lltc,ltm4686" },
{ .compatible = "lltc,ltm4700" },
{ }
};
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_new = ltc2978_probe,
.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");
MODULE_IMPORT_NS(PMBUS);
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