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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, 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, and LTM4676 */
#define LTC3880_MFR_IOUT_PEAK 0xd7
#define LTC3880_MFR_CLEAR_PEAKS 0xe3
#define LTC3880_MFR_TEMPERATURE2_PEAK 0xf4
/* LTC3883, LTC3884, LTC3886, LTC3889 and LTC7880 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 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 LTM2987_ID_A 0x8010 /* A/B for two die IDs */
#define LTM2987_ID_B 0x8020
#define LTC3889_ID 0x4900
#define LTC7880_ID 0x49E0
#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(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, pag
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