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![Felix Nieuwenhuizen](/assets/img/avatar_default.png)
Add support for LTC7132. The relevant registers in the LTC7132 are identical to the LTC7880. So it's just a matter of adding the chip id. Signed-off-by: Felix Nieuwenhuizen <Felix.Nieuwenhuizen@etas.com> Link: https://lore.kernel.org/r/20221027145135.31802-1-Felix.Nieuwenhuizen@etas.com Signed-off-by: Guenter Roeck <linux@roeck-us.net>
939 lines
26 KiB
C
939 lines
26 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Hardware monitoring driver for LTC2978 and compatible chips.
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*
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* Copyright (c) 2011 Ericsson AB.
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* Copyright (c) 2013, 2014, 2015 Guenter Roeck
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* Copyright (c) 2015 Linear Technology
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* Copyright (c) 2018 Analog Devices Inc.
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*/
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#include <linux/delay.h>
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#include <linux/jiffies.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/err.h>
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#include <linux/slab.h>
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#include <linux/i2c.h>
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#include <linux/regulator/driver.h>
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#include "pmbus.h"
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enum chips {
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/* Managers */
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ltc2972, ltc2974, ltc2975, ltc2977, ltc2978, ltc2979, ltc2980,
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/* Controllers */
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ltc3880, ltc3882, ltc3883, ltc3884, ltc3886, ltc3887, ltc3889, ltc7132, ltc7880,
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/* Modules */
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ltm2987, ltm4664, ltm4675, ltm4676, ltm4677, ltm4678, ltm4680, ltm4686,
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ltm4700,
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};
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/* Common for all chips */
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#define LTC2978_MFR_VOUT_PEAK 0xdd
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#define LTC2978_MFR_VIN_PEAK 0xde
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#define LTC2978_MFR_TEMPERATURE_PEAK 0xdf
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#define LTC2978_MFR_SPECIAL_ID 0xe7 /* Undocumented on LTC3882 */
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#define LTC2978_MFR_COMMON 0xef
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/* LTC2974, LTC2975, LCT2977, LTC2980, LTC2978, and LTM2987 */
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#define LTC2978_MFR_VOUT_MIN 0xfb
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#define LTC2978_MFR_VIN_MIN 0xfc
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#define LTC2978_MFR_TEMPERATURE_MIN 0xfd
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/* LTC2974, LTC2975 */
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#define LTC2974_MFR_IOUT_PEAK 0xd7
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#define LTC2974_MFR_IOUT_MIN 0xd8
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/* LTC3880, LTC3882, LTC3883, LTC3887, LTM4675, LTM4676, LTC7132 */
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#define LTC3880_MFR_IOUT_PEAK 0xd7
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#define LTC3880_MFR_CLEAR_PEAKS 0xe3
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#define LTC3880_MFR_TEMPERATURE2_PEAK 0xf4
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/* LTC3883, LTC3884, LTC3886, LTC3889, LTC7132, LTC7880 */
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#define LTC3883_MFR_IIN_PEAK 0xe1
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/* LTC2975 only */
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#define LTC2975_MFR_IIN_PEAK 0xc4
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#define LTC2975_MFR_IIN_MIN 0xc5
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#define LTC2975_MFR_PIN_PEAK 0xc6
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#define LTC2975_MFR_PIN_MIN 0xc7
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#define LTC2978_ID_MASK 0xfff0
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#define LTC2972_ID 0x0310
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#define LTC2974_ID 0x0210
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#define LTC2975_ID 0x0220
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#define LTC2977_ID 0x0130
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#define LTC2978_ID_REV1 0x0110 /* Early revision */
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#define LTC2978_ID_REV2 0x0120
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#define LTC2979_ID_A 0x8060
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#define LTC2979_ID_B 0x8070
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#define LTC2980_ID_A 0x8030 /* A/B for two die IDs */
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#define LTC2980_ID_B 0x8040
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#define LTC3880_ID 0x4020
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#define LTC3882_ID 0x4200
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#define LTC3882_ID_D1 0x4240 /* Dash 1 */
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#define LTC3883_ID 0x4300
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#define LTC3884_ID 0x4C00
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#define LTC3886_ID 0x4600
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#define LTC3887_ID 0x4700
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#define LTC3889_ID 0x4900
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#define LTC7132_ID 0x4CE0
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#define LTC7880_ID 0x49E0
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#define LTM2987_ID_A 0x8010 /* A/B for two die IDs */
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#define LTM2987_ID_B 0x8020
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#define LTM4664_ID 0x4120
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#define LTM4675_ID 0x47a0
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#define LTM4676_ID_REV1 0x4400
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#define LTM4676_ID_REV2 0x4480
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#define LTM4676A_ID 0x47e0
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#define LTM4677_ID_REV1 0x47B0
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#define LTM4677_ID_REV2 0x47D0
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#define LTM4678_ID_REV1 0x4100
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#define LTM4678_ID_REV2 0x4110
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#define LTM4680_ID 0x4140
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#define LTM4686_ID 0x4770
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#define LTM4700_ID 0x4130
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#define LTC2972_NUM_PAGES 2
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#define LTC2974_NUM_PAGES 4
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#define LTC2978_NUM_PAGES 8
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#define LTC3880_NUM_PAGES 2
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#define LTC3883_NUM_PAGES 1
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#define LTC_POLL_TIMEOUT 100 /* in milli-seconds */
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#define LTC_NOT_BUSY BIT(6)
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#define LTC_NOT_PENDING BIT(5)
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/*
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* LTC2978 clears peak data whenever the CLEAR_FAULTS command is executed, which
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* happens pretty much each time chip data is updated. Raw peak data therefore
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* does not provide much value. To be able to provide useful peak data, keep an
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* internal cache of measured peak data, which is only cleared if an explicit
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* "clear peak" command is executed for the sensor in question.
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*/
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struct ltc2978_data {
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enum chips id;
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u16 vin_min, vin_max;
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u16 temp_min[LTC2974_NUM_PAGES], temp_max[LTC2974_NUM_PAGES];
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u16 vout_min[LTC2978_NUM_PAGES], vout_max[LTC2978_NUM_PAGES];
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u16 iout_min[LTC2974_NUM_PAGES], iout_max[LTC2974_NUM_PAGES];
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u16 iin_min, iin_max;
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u16 pin_min, pin_max;
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u16 temp2_max;
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struct pmbus_driver_info info;
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u32 features;
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};
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#define to_ltc2978_data(x) container_of(x, struct ltc2978_data, info)
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#define FEAT_CLEAR_PEAKS BIT(0)
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#define FEAT_NEEDS_POLLING BIT(1)
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#define has_clear_peaks(d) ((d)->features & FEAT_CLEAR_PEAKS)
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#define needs_polling(d) ((d)->features & FEAT_NEEDS_POLLING)
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static int ltc_wait_ready(struct i2c_client *client)
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{
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unsigned long timeout = jiffies + msecs_to_jiffies(LTC_POLL_TIMEOUT);
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const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
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struct ltc2978_data *data = to_ltc2978_data(info);
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int status;
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u8 mask;
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if (!needs_polling(data))
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return 0;
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/*
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* LTC3883 does not support LTC_NOT_PENDING, even though
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* the datasheet claims that it does.
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*/
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mask = LTC_NOT_BUSY;
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if (data->id != ltc3883)
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mask |= LTC_NOT_PENDING;
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do {
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status = pmbus_read_byte_data(client, 0, LTC2978_MFR_COMMON);
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if (status == -EBADMSG || status == -ENXIO) {
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/* PEC error or NACK: chip may be busy, try again */
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usleep_range(50, 100);
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continue;
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}
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if (status < 0)
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return status;
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if ((status & mask) == mask)
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return 0;
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usleep_range(50, 100);
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} while (time_before(jiffies, timeout));
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return -ETIMEDOUT;
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}
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static int ltc_read_word_data(struct i2c_client *client, int page, int phase,
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int reg)
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{
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int ret;
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ret = ltc_wait_ready(client);
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if (ret < 0)
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return ret;
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return pmbus_read_word_data(client, page, 0xff, reg);
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}
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static int ltc_read_byte_data(struct i2c_client *client, int page, int reg)
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{
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int ret;
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ret = ltc_wait_ready(client);
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if (ret < 0)
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return ret;
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return pmbus_read_byte_data(client, page, reg);
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}
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static int ltc_write_byte_data(struct i2c_client *client, int page, int reg, u8 value)
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{
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int ret;
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ret = ltc_wait_ready(client);
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if (ret < 0)
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return ret;
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return pmbus_write_byte_data(client, page, reg, value);
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}
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static int ltc_write_byte(struct i2c_client *client, int page, u8 byte)
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{
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int ret;
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ret = ltc_wait_ready(client);
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if (ret < 0)
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return ret;
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return pmbus_write_byte(client, page, byte);
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}
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static inline int lin11_to_val(int data)
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{
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s16 e = ((s16)data) >> 11;
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s32 m = (((s16)(data << 5)) >> 5);
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/*
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* mantissa is 10 bit + sign, exponent adds up to 15 bit.
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* Add 6 bit to exponent for maximum accuracy (10 + 15 + 6 = 31).
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*/
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e += 6;
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return (e < 0 ? m >> -e : m << e);
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}
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static int ltc_get_max(struct ltc2978_data *data, struct i2c_client *client,
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int page, int reg, u16 *pmax)
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{
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int ret;
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ret = ltc_read_word_data(client, page, 0xff, reg);
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if (ret >= 0) {
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if (lin11_to_val(ret) > lin11_to_val(*pmax))
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*pmax = ret;
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ret = *pmax;
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}
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return ret;
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}
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static int ltc_get_min(struct ltc2978_data *data, struct i2c_client *client,
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int page, int reg, u16 *pmin)
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{
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int ret;
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ret = ltc_read_word_data(client, page, 0xff, reg);
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if (ret >= 0) {
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if (lin11_to_val(ret) < lin11_to_val(*pmin))
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*pmin = ret;
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ret = *pmin;
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}
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return ret;
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}
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static int ltc2978_read_word_data_common(struct i2c_client *client, int page,
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int reg)
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{
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const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
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struct ltc2978_data *data = to_ltc2978_data(info);
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int ret;
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switch (reg) {
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case PMBUS_VIRT_READ_VIN_MAX:
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ret = ltc_get_max(data, client, page, LTC2978_MFR_VIN_PEAK,
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&data->vin_max);
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break;
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case PMBUS_VIRT_READ_VOUT_MAX:
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ret = ltc_read_word_data(client, page, 0xff,
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LTC2978_MFR_VOUT_PEAK);
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if (ret >= 0) {
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/*
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* VOUT is 16 bit unsigned with fixed exponent,
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* so we can compare it directly
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*/
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if (ret > data->vout_max[page])
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data->vout_max[page] = ret;
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ret = data->vout_max[page];
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}
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break;
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case PMBUS_VIRT_READ_TEMP_MAX:
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ret = ltc_get_max(data, client, page,
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LTC2978_MFR_TEMPERATURE_PEAK,
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&data->temp_max[page]);
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break;
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case PMBUS_VIRT_RESET_VOUT_HISTORY:
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case PMBUS_VIRT_RESET_VIN_HISTORY:
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case PMBUS_VIRT_RESET_TEMP_HISTORY:
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ret = 0;
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break;
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default:
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ret = ltc_wait_ready(client);
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if (ret < 0)
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return ret;
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ret = -ENODATA;
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break;
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}
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return ret;
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}
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static int ltc2978_read_word_data(struct i2c_client *client, int page,
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int phase, int reg)
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{
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const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
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struct ltc2978_data *data = to_ltc2978_data(info);
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int ret;
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switch (reg) {
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case PMBUS_VIRT_READ_VIN_MIN:
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ret = ltc_get_min(data, client, page, LTC2978_MFR_VIN_MIN,
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&data->vin_min);
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break;
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case PMBUS_VIRT_READ_VOUT_MIN:
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ret = ltc_read_word_data(client, page, phase,
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LTC2978_MFR_VOUT_MIN);
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if (ret >= 0) {
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/*
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* VOUT_MIN is known to not be supported on some lots
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* of LTC2978 revision 1, and will return the maximum
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* possible voltage if read. If VOUT_MAX is valid and
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* lower than the reading of VOUT_MIN, use it instead.
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*/
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if (data->vout_max[page] && ret > data->vout_max[page])
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ret = data->vout_max[page];
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if (ret < data->vout_min[page])
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data->vout_min[page] = ret;
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ret = data->vout_min[page];
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}
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break;
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case PMBUS_VIRT_READ_TEMP_MIN:
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ret = ltc_get_min(data, client, page,
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LTC2978_MFR_TEMPERATURE_MIN,
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&data->temp_min[page]);
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break;
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case PMBUS_VIRT_READ_IOUT_MAX:
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case PMBUS_VIRT_RESET_IOUT_HISTORY:
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case PMBUS_VIRT_READ_TEMP2_MAX:
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case PMBUS_VIRT_RESET_TEMP2_HISTORY:
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ret = -ENXIO;
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break;
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default:
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ret = ltc2978_read_word_data_common(client, page, reg);
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break;
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}
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return ret;
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}
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static int ltc2974_read_word_data(struct i2c_client *client, int page,
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int phase, int reg)
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{
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const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
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struct ltc2978_data *data = to_ltc2978_data(info);
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int ret;
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switch (reg) {
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case PMBUS_VIRT_READ_IOUT_MAX:
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ret = ltc_get_max(data, client, page, LTC2974_MFR_IOUT_PEAK,
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&data->iout_max[page]);
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break;
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case PMBUS_VIRT_READ_IOUT_MIN:
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ret = ltc_get_min(data, client, page, LTC2974_MFR_IOUT_MIN,
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&data->iout_min[page]);
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break;
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case PMBUS_VIRT_RESET_IOUT_HISTORY:
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ret = 0;
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break;
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default:
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ret = ltc2978_read_word_data(client, page, phase, reg);
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break;
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}
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return ret;
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}
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static int ltc2975_read_word_data(struct i2c_client *client, int page,
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int phase, int reg)
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{
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const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
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struct ltc2978_data *data = to_ltc2978_data(info);
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int ret;
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switch (reg) {
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case PMBUS_VIRT_READ_IIN_MAX:
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ret = ltc_get_max(data, client, page, LTC2975_MFR_IIN_PEAK,
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&data->iin_max);
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break;
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case PMBUS_VIRT_READ_IIN_MIN:
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ret = ltc_get_min(data, client, page, LTC2975_MFR_IIN_MIN,
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&data->iin_min);
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break;
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case PMBUS_VIRT_READ_PIN_MAX:
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ret = ltc_get_max(data, client, page, LTC2975_MFR_PIN_PEAK,
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&data->pin_max);
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break;
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case PMBUS_VIRT_READ_PIN_MIN:
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ret = ltc_get_min(data, client, page, LTC2975_MFR_PIN_MIN,
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&data->pin_min);
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break;
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case PMBUS_VIRT_RESET_IIN_HISTORY:
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case PMBUS_VIRT_RESET_PIN_HISTORY:
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ret = 0;
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break;
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default:
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ret = ltc2978_read_word_data(client, page, phase, reg);
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break;
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}
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return ret;
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}
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static int ltc3880_read_word_data(struct i2c_client *client, int page,
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int phase, int reg)
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{
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const struct pmbus_driver_info *info = pmbus_get_driver_info(client);
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struct ltc2978_data *data = to_ltc2978_data(info);
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int ret;
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switch (reg) {
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case PMBUS_VIRT_READ_IOUT_MAX:
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ret = ltc_get_max(data, client, page, LTC3880_MFR_IOUT_PEAK,
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&data->iout_max[page]);
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break;
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case PMBUS_VIRT_READ_TEMP2_MAX:
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ret = ltc_get_max(data, client, page,
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LTC3880_MFR_TEMPERATURE2_PEAK,
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&data->temp2_max);
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break;
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case PMBUS_VIRT_READ_VIN_MIN:
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case PMBUS_VIRT_READ_VOUT_MIN:
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case PMBUS_VIRT_READ_TEMP_MIN:
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ret = -ENXIO;
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break;
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case PMBUS_VIRT_RESET_IOUT_HISTORY:
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case PMBUS_VIRT_RESET_TEMP2_HISTORY:
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ret = 0;
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break;
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default:
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ret = ltc2978_read_word_data_common(client, page, reg);
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break;
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}
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return ret;
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}
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static int ltc3883_read_word_data(struct i2c_client *client, int page,
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int phase, int reg)
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{
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|
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),
|
|
PMBUS_REGULATOR_STEP("vout", 1, LTC2978_N_VOLTAGES, LTC2978_UV_STEP),
|
|
PMBUS_REGULATOR_STEP("vout", 2, LTC2978_N_VOLTAGES, LTC2978_UV_STEP),
|
|
PMBUS_REGULATOR_STEP("vout", 3, LTC2978_N_VOLTAGES, LTC2978_UV_STEP),
|
|
PMBUS_REGULATOR_STEP("vout", 4, LTC2978_N_VOLTAGES, LTC2978_UV_STEP),
|
|
PMBUS_REGULATOR_STEP("vout", 5, LTC2978_N_VOLTAGES, LTC2978_UV_STEP),
|
|
PMBUS_REGULATOR_STEP("vout", 6, LTC2978_N_VOLTAGES, LTC2978_UV_STEP),
|
|
PMBUS_REGULATOR_STEP("vout", 7, LTC2978_N_VOLTAGES, LTC2978_UV_STEP),
|
|
};
|
|
|
|
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 = <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 == 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);
|