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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_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},
- {"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 == 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 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,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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